MF3580 - Sewing machine JUKI - Free user manual and instructions

USER MANUAL MF3580 JUKI

ENGLISH ENGLISHi For the sewing machine, automatic machine and ancillary devices (hereinafter collectively referred to as "machine"), it is inevitable to conduct sewing work near moving parts of the machine. This means that there is always a possibility of unintentionally coming in contact with the moving parts. Operators who actually operate the machine and maintenance personnel who are involved in maintenance and repair of the machine are strongly recommended to carefully read to fully understand the following SAFETY PRECAUTIONS before using/maintaining the machine. The content of the SAFETY PRECAUTIONS includes items which are not contained in the speci¿cations of your product. The risk indications are classi¿ed into the following three different categories to help understand the meaning of the labels. Be sure to fully understand the following description and strictly observe the instructions. Warning label

1. Never bring your fi ngers under the needle when the power switch is turned ON or the machine

2. Never bring your fi ngers, hair or clothes close to the handwheel and needle or place anything

on the handwheel and under the needle while the machine is in operation.

3. Loudness and quality of sound will change by kind and shape of the sewing product including

sewing speed, and sewing conditions by number of overlapped pieces, stitch length, etc. When using the sewing machine for a long period of time, there is a case where a sense of disharmony is felt sometimes. At this time, operate the sewing machine with your ears stopped by earmuffs or the like.

4. Be sure to turn OFF the power and perform the work after ascertaining that the sewing machine

does not run even when the starting pedal is depressed in case of checking, adjusting, cleaning, threading or replacing the needle of the sewing machine.

5. Never operate the sewing machine with the ground wire for the power supply removed so as to

6. Be sure to turn OFF the power switch in advance in case of inserting/removing the power plug.

7. In time of thunder and lightning, stop your work and disconnect the power plug from the

receptacle so as to ensure safety.

8. When you move the sewing machine from a cold place directly to a warm place, dew

condensation may result. Turn ON the power to the machine after you have confi rmed that there is no fear of dew condensation.

9. In case of maintenance, inspection, or repair, be sure to turn OFF the power switch and confi rm

that the sewing machine and the motor have completely stopped before starting the work. (In case of the clutch motor, it continues rotating for a while by the inertia even after turning OFF the power switch. So, be careful.)

10. Be careful of handling this product so as not to pour water or oil, shock by dropping, and the

like since this product is a precision instrument.

1. To prevent accidents caused by electric shock, never open the motor control box cover or

touch the components inside the control box while the power switch is ON. In addition, be aware that the safety devices such as the "eye protection cover" and "fi nger guard" are sometimes omitted in the sketches, illustrations and fi gures included in the Instruction Manual for the explanation's sake. In the practical use, never remove those safety devices. CAUTIONvi DECLARATION OF INCORPORATION OF PARTLY COMPLETED MACHINERY We hereby declare that the sewing machine (sewing head) described below ;

1. Must not be put into service until the machinery to which it is incorporated has been declared in

conformity with the provisions of the Directive 2006/42/EC, and

2. Conforms to the essential requirements of the Directive 2006/42/EC, described in the technical

3. To be prepared with the above technical documentation compiled in accordance with part B of

4. Also to conform to the RoHS Directive 2011/65/EU

5. Relevant information on which should be transmitted in response to a reasoned request by the

national authorities, by the electronic method or other according to the request. Applied harmonized standards, in particular :

2. Installing the belt cover (only for the sewing machine provided with a clutch motor)..................3

3. Relation between the motor pulley and the belt

1. How to remove the gauge components and upper feed roller

(mechanism with differential feed and mechanism without differential feed) ..............................22 2. Timing between the looper and needle bar ......................................................................................24

3. Adjustment of the needle entry positions in the right-left and front-rear directions ...................26

• 4. Looper adjustment p. 27
• 5. Adjusting the height of the needle bar p. 29
• 6. Adjustment of the looper motion paths p. 30
• 7. Adjustment of rear needle guard p. 32

8. Adjustment of feed dog height and longitudinal movement

(mechanism with differential feed) ...................................................................................................33

9. Adjustment of feed dog height and longitudinal movement

Lifting amount of presser Max. 9 mm (At the time of delivery from factory : 6.5 mm) 13 Feed roller width 11.9mm 14 Feed roller shape Standard (narrow type) 15 Feed adjustment Main feed : Slide type stitch pitch adjusting system With differential feed lever adjusting system Without differential feed 16 Lubrication Automatic rotary pump lubrication system 17 Lubricating oil JUKI MACHINE OIL No. 18 18 Oil tank capacity Tank capacity : 140 ml 19 Installation Table and auxiliary drive type

Supply voltage/ frequency Rated voltage ±10%, 50/60Hz 22 Noise - Equivalent continuous emission sound pressure level (L

) at the workstation : A-weighted value of 80.0 dB; (Includes K

1. Installing the machine head

At the beginning, the procedure of pulling out the machine head after opening the package is explained. Next, the procedure of installing the machine head is explained. Fix the machine head with head fi xing screw

by two persons or more as shown in Fig. 1. In addition, tightening torque of head fi xing screw

is 12 to 15 N•m. The work of installing/removing the ma- chine head is accompanied with the danger of the fall of machine head. Be sure to use the exclusive lift or execute the work with two persons or more and do not take the hands off until the head fi xing screw is securely tightened. In addition, when tightening the fi xing screw, laterally adjust the head position so that V-belt is set straight. If the V-belt is set bent, the progress of abrasion of V-belt is increased.

under the center of the frame. Put there one of your hands and support the machine head. Next, hold handwheel

with the other hand.

2) Pull out the machine head while another worker is

Be sure to perform the installation work of the machine head with two persons or more.− 3 −

2. Installing the belt cover

(only for the sewing machine provided with a clutch motor)

Equal clearance on the left and right When your machine uses a clutch motor, it is necessary to fi rstly mount the belt cover supplied with the unit over the motor to ensure safety. The supplied belt cover is intended for separately-available JUKI's exclusive mount base. If you use a different mount base, a belt cover specifi c to that mount base should be attached. If your mount base is not provided with its exclusive belt cover as an acces- sory, please contact the distributor or the manufacturer of your mount base to get a belt cover specifi c to your mount base.

with three setscrews

through the sewing machine pul- ley. Put V-belt

on the pulley. Refer to "

ing the handwheel" for further information on the handwheel.

of the clutch motor.

5) Adjust the lateral position of belt cover

using the projecting amount, 3 to 5 mm, of spacer

as a guide. Adjust the longitudinal position of the cover so that the clearance provided between the rim of spacer

is uniform on the right and left sides (

). Once the belt cover is correctly positioned, fi x the belt cover on the table by tightening four washers and four wood screws in the hole

6) Fit plug in section

. This hole is used as the oil hole for the connecting rod asm. (40068581).− 4 −

3. Relation between the motor pulley and the belt (only for the sewing machine

provided with a clutch motor)

1) Use a clutch motor with output power of 400 W or more. Use the M-type V-belt.

2) The relation of the motor pulley, belt length and number of revolutions of the machine is as shown in the following

table. Outside diameter of motor pulley JUKI part No. of motor pulley Number of revolutions (sti/min) Belt length (inch) JUKI part No. of V-belt 50Hz 60Hz 50" MTJVM005000 110 mm MTKP0105000 4420 105 mm MTKP0100000 4210 100 mm MTKP0095000 4000 95 mm MTKP0090000 3790 90 mm MTKP0085000 3580 4320 49" MTJVM004900 85 mm MTKP0080000 3370 4070 80 mm MTKP0075000 3160 3810 75 mm MTKP0070000 2950 3560 70 mm MTKP0065000 2740 3300

• The effective diameter of the motor pulley is obtained by subtracting 5 mm from the outside diameter.

• The direction of rotation of the motor is counterclockwise as observed from the pulley side. Take care not to allow the motor to rotate in the reverse direction.− 5 −

4. Installing the presser lifting lever

5. Installing the thread trimming knife

of presser lifting lever

In this state, fi x it on thread tension base

Next, pass connecting link

as shown in the fi gure and insert O-ring

into the both ends of it. Finally, fi x it with setscrew

Put bottom thread trimming knife

on top thread trimming knife

, insert them into knife cover

, and install them with two screws

as shown in the fi gure. When installing the knives, perform the work while taking care of the cut of fi ngers. (Blade section) Dangerous places of cut from the knives CAUTION

1. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of

2. Do not touch your fi ngers or hands to the blade section of knife. so as to prevent fatal accidents.

Perform the adjustment work by the maintenance engineers who are familiar with the sewing machine and trained for the safety so as to prevent accidents caused by unfamiliarity or wrong adjustment.

Apply the grease (Part No.: 40013640) supplied with the unit to the sliding parts encircled with (four locations) at least once every three months.

State that cloth puller cover and handwheel are installed

with three setscrews

supplied with the machine as accessories. (It is not necessary when MT03 is installed.)

• Tightening torque of the screw is 2.5 to 3 N•m.

1) Assemble the thread stand as shown

in the fi gure and install it in the hole of the table.

to such an extent that the thread stand does not move.

3) When using power supplied by the

overhead power line, pass the power supply cord through thread stand

6. Installing the cloth puller cover

• Install top feed cloth puller cover

supplied with the machine as accessories.

• Tightening torque of the screw is 2.5 to 3 N•m. Turning the sewing machine by hand, per- form positioning of the cover so that the cover does not come in contact with the sewing machine.

9. Installing procedure of the thread take-up lever oil guard

Attachments for the thread take-up lever oil guard are as shown in the left-hand fi gure. Take them out from the accessory box.

Thread take-up lever oil guard

Thread take-up lever oil guard base

Screws for the thread take-up lever oil guard First, insert tube hose

of thread take- up lever oil guard

until it goes no further. Be careful not to forcibly insert the tube hose since it may break. Then, install the aforementioned thread take-up lever oil guard

on puller drive cover

on the machine head side as illustrated in the fi gure at left. Firstly, fi x thread take-up lever oil guard base

. Secondly, fi x thread take- up lever oil guard

on thread take-up lever oil guard base

At this time, check to be sure that thread take-up lever oil guard

can be smoothly opened/closed. Finally, fi x hexagon nut

to prevent the hinge screw from loosening. Tightening torque is 0.5 to 1.0 N•m as the standard.

1. Names of machine head

Differential feed adjusting lever

Upper feed roller frame

Cover for needle bar and roller

Window screw for both as stitch length adjustment and oil plug

Pressure regulating nut

Pressure regulating plate spring assembly

Oil discharge screw (front)

Oil circulation inspection window (rear)

Roller pressure regulating spring

Roller pressure regulating screw

Oil circulation inspection window (front)

Rocking thread take-up lever thread guide

Rolled hemming folder

Needle thread rocking thread take-up lever

Needle thread support adjust plate

Thread take-up lever oil guard

Needle thread presser

Needle thread adjusting path

(1) Oil lubrication and check point

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine. Machine head with differential feed (2) Oil drain spot (1) Oil lubrication and check point (3) Oil lubrication and check point when the sewing machine has not been used for a relatively long period of time (4) Lubricating place of the top feed roller drive connecting section and the main shaft section (2) Oil drain spot Machine head without differential feed (2) Oil drain spot The sewing machine head section is of the rotary pump type auto lubrication system. Remove oil plug

and pour oil through the oil inlet until the upper engraved marker line on oil gauge (front)

reached. When starting pouring the oil, the oil is fi rstly fed to the rear part of the machine head. Therefore it appears that the oil level observed on the oil gauge gradually decreases. After running the machine for several hours, the oil amount becomes stable. At this time, re-check the oil level and add oil until the intermediate height between the upper and lower engraved marker lines is reached.

Upper and lower engraved marker lines of the oil gauge (front)

(1) Oil lubrication and check point Apply JUKI MACHINE OIL 18 (Part No.: MML018900CA) supplied with the machine.− 10 − When the sewing machine has not been used for a relatively long period of time or something has been done to the components related to oil circulation at the time of maintenance and inspection, there is a case where the circulation function of oil has been lost. This occurs because air enters in the circulation route. In this case, it can be checked with oil circulation check windows

When the circulation of oil cannot be checked, remove two pump screws of

, apply a few drops of oil until the oil surface can be checked there. (2) Oil drain spot To replace the lubricant, remove the oil drain (front) and (rear) screws

. Upon the completion of oil drainage, tighten the oil drain (front) and (rear) screws

Machine head without differential feedMachine head with differential feed (3) Oil lubrication and check point when the sewing machine has not been used for a relatively long period of time

Apply one or two drops of oil once a week to fi ve points

of the upper feed roller drive connecting section and the main shaft section once every week. Apply grease supplied with the machine as the accessories every three months, as a standard, to the respective slide sections of presser spring

and presser lifting bracket

(4) Lubricating place of the top feed roller drive connecting section and the main shaft section (5) Grease applying place Opening/closing the roller cover When applying oil to the top feed roller drive connecting section, perform oiling by opening and closing roller cover

In addition, when oil adheres to oil receiving sections

, wipe it out. Perform oiling to the main shaft section by removing the rubber plug of the belt cover when using MT03. Remove the thumbscrew when opening and closing the roller cover. Remove the roller cover and apply grease (Part No.: 40013640) supplied with the unit to joining part

of main shaft and hook driving shaft.

3. Checking the direction of rotation

4. Attaching the needles

Direction of rotation of the sewing machine is the same as that of the hand of watch as viewed from the handwheel side. It is counterclockwise as viewed from the working position of the operator. Never rotate it in the reverse direction. Lubricating pump fails to work and seizure will be caused.

2) Insert new needles until they go up to the rear of

the hole of needle clamp

in the way that the scarf is facing rearward as viewed from the operator's direction.

of needle. Good No good Good No good Scarf section

5. How to pass the threads

(1) With differential feed (MS-3580SF/1SN)

1) Threading diagram for the machine with differential feed

for left needle thread,

for middle needle thread,

for right needle thread Looper :

for rear looper Perform threading in accordance with the threading diagram. Needle section Looper section Looper thread cam section Tension section

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

(2) Without differential feed (MS-3580SF/0SN)

1) Threading diagram for the machine without differential feed

for left needle thread,

for middle needle thread,

for right needle thread Looper :

for rear looper Perform threading in accordance with the threading diagram. Needle section Looper section Looper thread cam section Tension section

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 15 −

When rotating the sewing machine with loopers tilted front, be sure to return them to their home positions since they may come in contact with the cover or fi ngers may be caught in them.

near the lower dead point of needle bar and the loopers tilt front to facilitate to pass the threads. Accordingly, perform threading with the loopers tilted front.

and they return to their home positions as shown in the fi gure. State loopers tilted State before loopers tilt

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine. (3) looper− 16 −

6. Presser adjustment

(1) Adjustment of amount of rise of presser The standard amount of rise is 6.5mm for the standard class of the presser

begins to rise faster by 3.2mm above the upper face of the throat plate

before the upper feed roller begins to rise. (2) Adjustment of presser bar pressure Proper pressure of the presser

shall be applied to the material while it is sewn. Turn the pressure adjusting nut

clockwise and counterclockwise to adjust pressure. 6.5mm

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 17 − (3) Installation and pressure adjustment of presser and presser yoke

, mount the presser yoke

on the presser shaft

, and tighten the setscrew

smoothly moves up and down, being free from rattling on the right and left. If there is rattling on the right and left, loosen four setscrews

to set up the presser shaft guide

to eliminate right and left rattling by means of the right/left holding guide plate

. Make adjustments to permit the presser shaft to perform light movement up and down. Since then, tighten the setscrew

3) Install the pressure adjusting leaf spring set

and turn the pressure adjusting nut

until pressure of the presser

Turning the pressure adjusting nut

clockwise causes the pressure to increase.

Turning the pressure adjusting nut

counterclockwise causes the pressure to decrease.

4) In order to make the presser

rise by 3.2mm faster than the upper feed roller, loosen the setscrew

and move the presser shaft guide

up and down until a clearance of 0.8mm is secured between the lower hole face of the lever link

and the bottom face of the lever link hanger setscrew

. (Lower dead point of the needle bar) (4) Removal and installation of presser only To replace presser

only, loosen the right and left setscrews

and change the presser

Then, tighten the right and left setscrews

1. At the same time, check the mounting position of the needle thread rocking thread take-up lever

2. At the lower dead point of the needle bar, a clearance of 1.6mm shall be secured between the bot-

tom face A of the needle thread rocking thread take-up lever connecting base

and the upper face B of the cut section of the front cover

3. If the amount of presser rise is too excessive than required, the presser will touch the needle

clamp, thus causing needle breakage or stitch skipping.

4. If pressure of the presser is too insuffi cient or excessive than required, the material cloth will ad-

5) To secure the standard amount of rise of 6.5mm for the presser

and move the stop collar

up and down until a clearance of 6.5mm is secured between the lower face "C" of the mounting position of the presser shaft guide bush

and the upper face "D" of the stop collar

. Since then, tighten the setscrew

When the above-mentioned adjustments are made, the connecting positions shall be secured for the lifter lever

with slide hole and the lifter lever

by moving the lifter lever

with slide hole in the right direction. When proper positioning has been secured, tighten the setscrew

7. Adjustment of feed mechanisms

(1) Adjustment of stitch length (standard: 8 stitches/inch interval)) No differential function is provided to the mechanism without differential feed. (2) Adjustment of differential feed amount If the stitch length has been changed, check "

-7. Adjustment of rear needle guard" and make a proper readjustment. Set the stitch length within the range of 2.1 to 3.6 mm. If the stitch length is set to 3.6 mm or more, Do not set the stitch length to

3.6 mm or more since the interference of

components may be caused. When the stitch length adjusting window screw

removed, the lever setscrew

to move the lever upwards and fasten the lever setscrew

there. This action increases the stitch length.

to move the lever downwards and fasten the lever setscrew

there. This action decreases the stitch length. ※ When fi xing the differential feed adjusting lever

pinch it with two setscrews

In the case the right material is fed faster than the left one Turn differential feed adjusting lever

toward markings 1 to 4 to adjust the misalignment between the right and left materials.

In the case the right material is fed slower than the left one Turn differential feed adjusting lever

toward markings 6 to 9 to adjust the misalignment between the right and left materials.

1. No graduation is available for the adjust-

ment of the stitch length.

2. When the stitch length is changed

If the forward or backward movement of the main feed dog is changed, the con- tact amount is also changed between each needle and the rear needle holder. Since this can be a cause of stitch skipping, the rear needle holder should be readjusted. Vertical direction

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine. The stitch length can be adjusted within the range of 2.1 to

3.6 mm. Standard adjustment is 3.2 mm.

For the adjustment of the stitch length, loosen the lever setscrew

and move the lever upwards or downwards until the required length is secured. In the case misalignment between the right and left materials occurs during sewing, adjust so that they are sewn with properly aligned by means of differential feed adjusting lever

has markings numbered from 1 to 9. When differential feed adjusting lever

is set at the marking 5, the differential feed ratio of the differential feed amount to the main feed amount is 1:1. Turn the adjusting lever toward the marking 1 to decrease the differential feed amount or toward the marking 9 to increase it. With differential feed Without differential feed 1− 19 −

8. Adjustment of drawing amount of upper feed roller

(1) Drawing amount of upper feed roller The standard amount of draw for the upper feed roller

defi ned to cause a slight pulling force for the sewing length (8 stitches/inch) of the feed dog. The clutch connecting lever

are connected. The amount of draw for the material cloth can be changed by moving the clutch connecting rod

vertically. Loosen the nut

after adjusting the clutch connecting rod

When the clutch connecting rod

is raised, the amount of draw for the material cloth is increased.

When the clutch connecting rod

is lowered, the amount of draw for the material cloth is decreased.

1. If the amount of draw for the upper feed roller

is too much in conjunction with the sewing feed amount, the number of stitches is increased.

2. If the amount of draw for the upper feed roller

is too less, sewing problem occurs and this is a cause of feed error. In particular, this problem occurs around the hinged section.

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 20 − (2) How to fi ll grease into the upper feed roller and to adjust the brake spring When the grease inside the upper feed roller has reduced, the amount of feed may be inconsistent or large noise may be generated. In such a case, carry out the following steps of procedure.

4) Remove three setscrews to remove the clutch driving

3) Loosen two nuts with two spanners to remove the

washer and brake spring from under the nuts.

2) Remove the nut which secures the clutch lever with a

. Remove cloth puller cover

6) Reassemble the removed parts back to their former

state. Finally, adjust the brake spring pressure by the tightening amount of the two nuts. For the standard adjustment, the upper feed roller rotates by pressing the spring balance as shown in the fi gure at left against the roller to apply a pressure of 10N to 30N. The effi ciency of feed may need to be increased in accordance with sewing conditions. In such a case, increase the pressure.

7) When fi lling grease into the upper feed roller, the

grease should be applied to the sliding part of the roller for increased smoothness of the roller connector. If the upper feed roller loses its smoothness, the rotational resistance which causes the entire upper feed roller unit to feed smoothly will deviate.

5) Fill the grease (Part No.: 40013640) supplied with the

unit to the entire periphery of the clutch roller. The clutch roller has two layers, upper and lower. For the sake of maintenance, only the upper layer should be fi lled with grease since the grease will gradually fl ows down to the lower layer.− 22 −

STANDARD ADJUSTMENT To perform the standard adjustment, remove the gauge components " needle

differential feed dog

", the cover components " needle bar roller cover

components, roller pressure regulating screw

, and pressure regulating plate spring ssembly

before adjustment. The directions of front, rear, right, and left during standard adjustment are based on the operator working position. Therefore, the forward rotation of the pulley is coun- terclockwise.

1. How to remove the gauge components and upper feed roller

(mechanism with differential feed and mechanism without differential feed)

and remove the needle bar and roller cover

and simultaneously remove side cover

and remove the washer and clutch connection rod

4) Remove roller pressure regulating screw

in the upper feed roller shaft, lift upper feed roller shaft

is lifted, the guide fi nger

interferes with the lift le- ver crank

after lifting the lift lever crank

slightly. Left side of the machine head

Rear side of the machine head

Right side of the machine head

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

#0− 23 − The disassembly procedure mentioned above mainly describes about the mecha- nism with differential feed. For the mechanism without differential feed, differential feed

and remove the pressure regulating plate spring assembly

that securing corresponding needles and remove three of each needle

securing the presser yoke and remove the presser yoke

after lifting the presser shaft

and remove the setscrew

securing the cover. Removal of the setscrew allows you to remove the looper cover

10) Loosen three setscrews

securing the throat plate and remove the throat plate

and remove the differential feed dog

and remove the main feed dog

securing the loopers

Pressure regulating plate spring and its related parts Left side of the machine head Gauge components (Mechanism with differential feed) Gauge components (Mechanism without differential feed)

2. Timing between the looper and needle bar

(1) Timing between the looper and needle bar (synchronization) Gauge components are mounted to perform synchronization adjustment. The standard position is that there is no clearance between the bottom surface of lower needle bar bushing

and the top surface of clip

when hexagonal wrench key (3 mm)

touches throat plate

by rotating the handwheel in the normal and reverse directions, (Be sure to rotate the handwheel in both directions to check the clearance.) The allowable clearance range is from 0 to 0.1 mm. The allowable clearance between the hexagonal wrench key (3 mm)

and the throat plate

ranges from 0 to 0.1mm when the bottom surface of the lower needle bar bushing

touches the top surface of the timing gauge

ahead of the other touch by rotating the pulley in both directions. (2) Installing and adjustment procedure of the hexagonal wrench key and clip

into front looper base

and tighten setscrew

into which the hexagon wrench key (3 mm)

has been inserted until its leftmost point is reached.

and tighten setscrew

4) Turn the pulley to bring hexagonal wrench key (3

to the leftmost point. Adjust the clearance measured from the right side face of the pulley to the left side face of throat plate

to 9 mm. Then, temporarily tighten setscrew

Further adjust the base to the correct position and securely tighten the setscrew.

5) Rotate the handwheel counterclockwise and stop it at

the position where hexagonal wrench key (3 mm)

touches the left surface of throat plate

Attach a commercially-available alligator clip (small) with its upper face aligned with the mark-off line. Attach clip

so that the top surface of clip

touches the bottom surface of lower needle bar bushing

7) When the handwheel is rotated clockwise, hexagonal

moves to the right and left. Touch the hexagonal wrench key with the left surface of throat plate

again. At this moment, make sure that the clearance between the bottom surface of lower needle bar bushing

and the top surface of clip

is within the allowable range. The bottom surface of lower needle bar bushing

may touch the top surface of clip

ahead of the other touch, in such a case, make sure that the clearance of the touching position between hexagonal wrench key (3 mm)

within the allowable range. Clearance at rotation in both directions : 0 to 0.1mm Position where hexagonal wrench key (3 mm)

touches throat plate

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

8) If the timing between the looper (hexagonal wrench

is inappropriate, follow the procedure below. Right-left direction 9mm Improper synchronization position adjustment may cause stitch skipping or thread breakage.

5− 25 − (3) Corrective points and corrective measures

1) For adjusting the timing between the looper

(hexagonal wrench key (3 mm)

and remove rear top cover

2) Remove oil pump asm.

(which is fi xed with two screws

). Loosen three screws

in front and rear couplings

of the main shaft. Engage a key wrench with setscrew

in main-shaft front coupling

to turn the setscrew clockwise or counterclockwise for adjustment while keeping main-shaft rear coupling

from moving. Then reassemble the oil pump asm adjusting the backlash.

1. Align the match marks.

2. For moving the front main shaft cou-

, temporarily tighten one of the fi xing nuts

, which is close to the match mark, and make an adjustment.

To increase the clearance between hexagonal wrench key (3 mm)

To decrease the clearance between hexagonal wrench key (3 mm)

3) After adjustment, put the rear top cover

back on and tighten the setscrew

Clockwise- counterclockwise direction Match mark

. The backlash is increased by raising the oil pump or decreased by lowering it.− 26 −

3. Adjustment of the needle entry positions in the right-left and front-rear directions

1) Needle entry position in the right-left direction

. The standard needle entry position "A" in the right-left direction is the center of the needle hole of the throat plate

The standard needle entry position in the front-rear direction is decided under the condition that the clearance between the needle

and needle hole of the throat plate

, "B", is the same for all of 3 positions. Adjust the needle entry position in accor- dance with the temporary needle bar

height of 12.5 mm. Refer to "

5. Adjustment of the needle bar

height". (2) Checking procedure of needle entry

and tighten the setscrew

2) Loosen the needle bar holding screw

height (12.5 mm), and tighten the needle bar holding screw

temporarily (approximately needle bar

into the hole at the top of the needle bar

and rotate the needle bar

in the right-left direction to adjust the needle entry position in the front-rear and right-left directions.

1. Improper needle entry position adjust-

ment may cause stitch skipping, needle breakage, or thread breakage.

2. Needle entry adjustment is performed in

accordance with the temporary needle bar height. When the needle bar is at the upper dead point, the temporary clearance be- tween the top surface of the throat plate

and the tips of the needles

3. The needle bar height is temporarily

adjusted for needle entry adjustment. If there is no problem with the needle bar height, readjustment of the needle bar height is not required. Advance to the next step. Right-left direction Front-rear direction

Hole at the top of the needle bar

Clockwise-counterclockwise direction Torque

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine. Temporary needle bar height 12.5mm

Top surface of the throat plate− 27 −

4. Looper adjustment

) is at the most left position, the standard distance from the tip of each looper (

) to the center of each needle (

1) Standardization of the front looper

is at the most left position, measure the distance from the tip of front looper

to the center of left needle

and adjust the distance to the standard value, i,e, 3.6 mm.

2) Standardization of middle and rear loopers

When the tips of the middle and rear loopers (

) are simultaneously aligned with each left surface of the middle and right needles as well as the tip of the front looper

with the left surface of the left needle

, the middle and rear loopers are in the standard positions. For the front looper

, the looper return is adjusted with the gauge

and a scale, and for the middle and rear loopers (

) , the looper return is adjusted by aligning the tips of the middle and rear loopers (

) with the left surfaces of the needles (

), respectively. (2) Front looper

to remove the throat plate

on the front looper base

and tighten the setscrew

3) Rotate the handwheel in the direction of reverse

rotation, move front looper

to the most left position, and measure the clearance from the tip of front looper

For adjusting the clearance to the standard distance, loosen the setscrew

securing the front looper base to adjust the position of the front looper base

in the right-left direction.

5) After adjustment, tighten the setscrew to secure the

front looper base setscrew

1) Rotate the pulley counterclockwise and align the tip

with the left surface of the left needle

on the middle looper base

and tighten the setscrew

securing the middle looper base and move the middle looper base

in the right- left direction to align the tip of the middle looper

with the left surface of the right needle

4) After adjustment, tighten the setscrew

to secure the middle looper base.

Alignment Alignment Right-left direction 3.6mm Front-rear direction

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

!4− 28 − (5) Adjustment of the clearance between the looper and needle When the tips of each looper (

) are at the center of each needle (

), the standard clearance is 0.0mm (slight touch). After adjusting the rear needle guide

, make sure again that the clearance between the loopers (

) to the center of each needle (

) is 0.0 mm respectively, and perform fi nal adjustment of the clearance after threading.

1. When the positions of respective looper

) are adjusted in the right and left directions, adjust the clearance from the tips of the respective loopers (

) to the respec- tive needles (

) is moved leftward, each tip of loopers

) is detached from each needle (

is moved rightward, each tip of loopers (

) touches each needle (

) securing the looper bases to adjust the positions of the looper bases (

) in the front-rear direction.

2) After adjustments, tighten the setscrews (

) to secure the looper bases.

Looper tip Clearance of 0.0 mm (slight touch) Center of needle Front-rear direction

1. When the positions of each looper base (

) are adjusted in the right-left direction, adjust the clearances from the tips of the loopers (

2. Insuffi cient or excessive looper return may cause stitch skipping, needle breakage, or thread

breakage. (4) Rear looper

Rotate the pulley counterclockwise and align the tip of the front looper

with the left surface of the left needle

2) Mount the rear looper

on the rear looper base

and tighten the setscrew

securing the rear looper base and move the rear looper base

in the right-left direction to align the tip of the rear looper

with the left surface of the middle needle

4) After adjustment, tighten the setscrew

to secure the rear looper base. If clearance adjustment is performed without the rear needle guide

, a little strongly touch the tips of the loopers (

) with the needles (

5. Adjusting the height of the needle bar

(1) Height of the needle bar

1) Alignment between the bottom surface of the front

looper and the top hole end of the left needle When the pulley is rotated counterclockwise and the bottom surface of the front looper

is aligned with the top hole end of the left needle

, the standard needle bar height is achieved by adjusting the distance from the tip of the front looper

the right surface of the left needle

2) Alignment between the tip of the front looper and the

left surface of the left needle When the pulley is rotated counterclockwise and the tip of the front looper

is aligned with the right surface of the left needle

, the standard needle bar height is achieved by adjusting the distance from the bottom surface of the front looper

to the top hole end of the left needle

1. Needle entry adjustment is performed in

accordance with the temporary needle bar height. When the needle bar is at the upper dead point, the temporary clearance be- tween the top surface of the throat plate

and the tips of the needles

2. The needle bar height is temporarily

adjusted for needle entry adjustment. If there is no problem with the needle bar height, readjustment of the needle bar height is not required. Advance to the next step.

3) Checking of the middle and rear looper heights shall

be also checking of each looper return. For adjusting the needle bar height, select an easier-to-adjust one from either 1) or 2) mentioned above. (2) Adjustment of the needle bar height

1) Remove the needle bar, roller cover, surface cover,

and adjust the needle bar

position vertically.

3) After adjustment, tighten the setscrew

1. Use caution not to rotate the needle bar

at adjustment of needle bar height. Failure to observe this changes needle entry positions.

2. Remarkably improper needle bar height

adjustment may cause stitch skipping, needle breakage, or thread breakage. Alignment between the bottom surface of the looper and the top hole end of the needle Alignment between the tip of the looper and the right surface of the needle

Right surface of the left needle Alignment 0.8mm

1.6mm Right surface of the left needle Alignment Temporary needle bar height 12.5mm

Top surface of the throat plate

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 30 −

6. Adjustment of the looper motion paths

The standard position of the front looper

is decided under the condition that the tip of the needle

touches the rear of the front looper

at 1/3 from the bottom surface when the pulley is rotated counterclockwise and the front looper

is moved from right to left after mounting the front looper

in a standard manner.

While the looper is moving backward, the side face of the needle should comes in contact with the back side of the looper when the needle tip is 1 mm or more away from the middle of the back ridge of the looper. (Front, middle and rear loopers) When the material has a section which has a large difference in height, the depth of back-to-back contact between the needle tips and loopers (

) has to be de- creased. (In order to prevent the needle tip from being crushed.)

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine. (2) Adjustment of longitudinal movement of the looper with differential feed

(4 pcs.) and remove the cylinder side cover

with a spanner wrench, and adjust the forward/reverse movement by moving the setscrew

forward or backward.

3) After adjustments, mount the cylinder side cover

and tighten the setscrews

When reducing the front and rear momentum amount of the looper, move the ball joints

When increasing the front and rear momentum amount of the looper, move the ball joints

downwards. Model with differential feed Up-down direction

The ridge of the needle tip should come in contact with the looper at a point that is 1 mm or more from the bottom. 1 mm or more

1. When the front and rear momentum of the looper has been adjusted, move the respective looper

, and readjust the front/rear positions of the needles (

2. When the above-mentioned adjustments are carried out, the throat plate

3. When the front and rear momentum amount of the looper is small :

The amount of contact becomes large between tips of the needles (

) and rear parts of the loopers (

) and this can be a cause of needle tip being blunt.

4. When the front and rear momentum amount of the looper is large :

The clearance becomes large between tips of the needles (

) and rear parts of the loopers (

) and this can be a cause of stitch skipping.− 31 −

1. When the front and rear momentum of

the looper has been adjusted, move the respective looper bases

and readjust the front/rear positions of the needles (

ments are carried out, the throat plate

3. When the front and rear momentum

amount of the looper is small : The amount of contact becomes large between tips of the needles (

) and rear parts of the loopers (

) and this can be a cause of needle tip being blunt.

4. When the front and rear momentum

amount of the looper is large : The clearance becomes large between tips of the needles (

) and rear parts of the loopers (

) and this can be a cause of stitch skipping. (3) Adjustment of longitudinal movement of the looper without differential feed

(4 pcs.) and remove the cylinder side cover

with a screwdriver, and adjust the forward/reverse movement by moving the setscrew

forward or backward.

3) After adjustments, mount the cylinder side cover

and tighten the setscrews

When reducing the front and rear momentum amount of the looper, move the ball joints

When increasing the front and rear momentum amount of the looper, move the ball joints

downwards. Model without differential feed Up-down direction

Right and left directions

7. Adjustment of rear needle guard

(1) Longitudinal adjustment of the rear needle guard

1) When the pulley is turned counterclockwise and

the rear needle guard

advances to the most front position, it lightly touches the left needle

(If necessary, press it lightly so that all the needles can be guarded.) and then tip of the front looper

passes. When tip of the front looper

reaches the position 1.5mm apart from the left side of the left needle

while this front looper

moves in right direction, the standard position is that the needle tip comes in contact with the rear needle guard

2) The relationship between the middle needle

and between the right needle

and the middle looper

is also required to assume the same conditions as (1) -1). above in standard positioning.

and move the rear needle guard

forward or backward to adjust.

4) After adjustments, tighten the setscrew

(2) Height adjustment of rear needle guard

1) The relationship between the middle needle

and between the right needle

and the middle looper

is also required to assume the same conditions as (1) -1) above in standard positioning.

and move the rear needle guard base

vertically to adjust the height.

3) After adjustments, tighten the setscrew

Longitudinal directions of rear needle guard Vertical direction of rear needle guard Longitudinal directions The clearance provided between the blade point of the looper and the needle should be 0 to 0.05 mm.

1.5mm Up-down direction

Right and left directions

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

1. To change the stitch length, readjust-

ment of the front and rear positions is also needed for rear needle guard

2. When the rear needle guard is adjusted,

recheck the non-presence of a clearance between the respective needles (

) and the respective loopers (

). If any clearance is perceived, readjust the related conditions.

3. Is a clearance is actually developed

between the respective needles (

) and rear needle guard

, this can be a cause of needle breakage or stitch skipping.

4. When rear needle guard

presses the respective needles (

) too much, this can be a cause of needle tip being blunt.

When the right side face of the needle is aligned with the blade point of the looper Distance between the needle guard and the bottom end of the needle eyelet : 0.5 to 2 mm− 33 − (1) Height of main feed dog The standard height is defi ned when the main feed dog

attains the highest level and the root section of the main feed dog

coincides with the upper face of the main feed dog throat plate

(2) Height of differential feed dog The standard height of the differential feed dog

is defi ned when the main feed dog

attains the highest level and bottom face "B" of differential feed dog

lightly touch upper face "A" of main feed dog

(3) Adjustment of longitudinal movement of main feed dog The maximum amount of feed of the main feed dog

is 3.6 mm. (Standard : 3.2 mm) When the main feed dog

attains its maximum feeding amount, the standard positioning is secured when Clearance "C" and Clearance "D" are equalized. Clearance "C" is defi ned as the distance from the feed groove front section of the throat plate

to the front section of the main feed dog

in position where the main feed dog

stays in the most advanced position. Clearance "D" is defi ned as the distance from the feed groove rear section of the throat plate

to the rear section of the main feed dog

in position where the main feed dog

has attained the most retreated position. (4) Adjustment of vertical height of main feed dog and differential feed dog For the feed rocking lever eccentric pin

of the feed dog, the standard positioning of the groove is horizontal. The vertical height of the main and differential feed dogs (

) can be simultaneously adjusted by turning the feed rocking lever eccentric pin

. Basically, however, this function should be used in standard position. (5) Gradient of main feed dog and differential feed dog Front lowering condition is standard.

8. Adjustment of feed dog height and longitudinal movement

(mechanism with differential feed) Height of main feed dog Height of differential feed dog Clearance of the main feed dog in the most advanced position Clearance of the main feed dog in the most retreated position Longitudinal directions

Top surface Coincidence

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 34 − (6) Adjustment of main feed dog and differential feed dog

of the feed dog, the standard positioning of the groove is horizontal. If the groove seems to be inclined deviating from the standard positioning, loosen the setscrew

and adjust the feed rocking lever eccentric pin

of the feed dog until it assumes its horizontal posture. Since then, tighten the setscrew

2) Mount the main feed dog

, differential feed dog

and fi x the throat plate

3) In the fi rst place, adjust the height of the main

to the standard position. Then fi x it by tightening the setscrew

4) Apply the feed dog support

to the bottom of the front section of the main feed dog

and tighten the setscrew

5) Then, adjust the height of the differential feed dog

to the standard position. After that, fi x it by tightening the setscrew

-7. Feed adjustments, (1) Adjustment of stitch length" , adjust the maximum feed amount of the main feed dog

to 3.6mm. (Apply a ruler to the side of the main feed dog

and confi rm the result by turning the pulley counterclockwise.)

Turn the pulley counterclockwise and confi rm that there is no contact between the main feed dog

and the feed groove front/rear section of the throat plate

If there is any contact, loosen the setscrew

of the main feed rocking lever link

and turn the main feed rocking eccentric drive stud

to adjust the throat plate

not to contact the feed groove front/rear section. After adjustments, tighten the setscrew

8) After the adjustment of the amount of forward and

back movement of main feed dog

, adjust the feed amount to the stitch length to be used (for sewing).

1. In the case of front and rear adjustments of the mechanism with differential feed, specifi c atten-

tion should be paid to the fi ne feed dog section of main feed dog

2. To make front and rear adjustments of the main feed dog

, loosen eight setscrews

of the cyl- inder cover and remove the cylinder cover set

. After adjustments, mount the cylinder cover set

and tighten the setscrews

3. For the main feed dog

and the differential feed dog

, the longitudinal gradients and the hori- zontality are kept constant and cannot be adjusted.

4. After any adjustment of feed dog (

) or this page recheck adjustment of rear needle guard or

7. Adjustment of rear needle guard] and readjust as necessary.

5. When the height of feed dogs

The amount of feed is decreased and uneven feeding can occur.

When the height of the rear needle guide is lowered, this will cause breakage of a needle or stitch skipping.

6. When the height of feed dogs

This can be a cause of the materials pushed back to the front side, or of giving rise to feed fl aws.

When the height of the rear needle holder is raised and the margin of the needle contact position is increased, this will cause failure in producing loops and stitch skipping.

9. Adjustment of feed dog height and longitudinal movement

(mechanism without differential feed) (1) Height of main feed dog The standard height is defi ned when the main feed dog

attains the highest level and the rear root section of the main feed dog

coincides with the upper face of the throat plate

of the main feed dog

(2) Adjustment of longitudinal movement of main feed dog The maximum amount of feed of the main feed dog

is 3.6 mm. (Standard : 3.2 mm) When the main feed dog

attains its maximum feeding amount, the standard positioning is secured when Clearance "A" and Clearance "B" are equalized. Clearance "A" is defi ned as the distance from the feed groove front section of the throat plate

to the front section of the main feed dog

in position where the main feed dog

stays in the most advanced position. Clearance "B" is defi ned as the distance from the feed groove rear section of the throat plate

to the rear section of the main feed dog

in position where the main feed dog

has attained the most retreated position. (A = B) (3) Adjustment of the vertical height of main feed dog

1) Apply the rear support screw

to the bottom right of the main feed dog

, tighten the setscrew

, and mount the throat plate

2) Check the standard height of the main feed dog

If the main feed dog

is low, raise the rear support screw

If the main feed dog

is high, raise the rear support screw

3) Remove the throat plate

to remove the main feed dog

, and adjust height of the front support screw

4) After adjustments, mount the main feed dog

tighten the setscrew

, mount the throat plate

and tighten the setscrew

When the height of main feed dog

The amount of feed is decreased and uneven feeding can occur.

When the height of the rear needle guide is lowered, this will cause breakage of a needle or stitch skipping. When the height of main feed dog

This can be a cause of the materials pushed back to the front side, or of giving rise to feed fl aws.

When the height of the rear needle holder is raised and the margin of the needle contact position is increased, this will cause failure in producing loops and stitch skipping. Height of main feed dog Coincidence

Clearance of the main feed dog in the most advanced position Clearance of the main feed dog in the most retreated position

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

4− 36 − (4) Adjustment of longitudinal movement of main feed dog

) and remove the plug female screw

2) Using a screwdriver, turn the eccentric pin

clockwise and counterclockwise until the front and rear positions of the main feed dog

are properly adjusted.

(5) Longitudinal adjustment of the rear needle guard

1) When the pulley is turned counterclockwise and

the rear needle guard

advances to the most front position, it lightly touches the left needle

(If necessary, press it lightly so that all the needles can be guarded.) and then tip of the front looper

passes. When tip of the front looper

reaches the position 1.5mm apart from the left side of the left needle

while this front looper

moves in right direction, the standard position is that the needle tip comes in contact with the rear needle guard

2) The relationship between the middle needle

and between the right needle

and the middle looper

is also required to assume the same conditions as (5) -1). above in standard positioning.

and move the rear needle guard

forward or backward to adjust.

4) After adjustments, tighten the setscrew

Longitudinal directions of rear needle guard Vertical direction of rear needle guard Longitudinal directions

1.5mm Up-down direction

1. To change the stitch length, readjust-

ment of the front and rear positions is also needed for rear needle guard

2. When the rear needle guard is adjusted,

recheck the non-presence of a clearance between the respective needles (

) and the respective loopers (

). If any clearance is perceived, readjust the related conditions.

3. Is a clearance is actually developed

between the respective needles (

) and rear needle guard

, this can be a cause of needle breakage or stitch skipping.

4. When rear needle guard

presses the respective needles (

) too much, this can be a cause of needle tip being blunt.

When the right side face of the needle is aligned with the blade point of the looper Distance between the needle guard and the bottom end of the needle eyelet : 0.5 to 2 mm− 37 − (6) Height adjustment of rear needle guard

1) The relationship between the middle needle

and between the right needle

and the middle looper

is also required to assume the same conditions as (5) -1) in standard positioning.

and move the rear needle guard base

vertically to adjust the height.

3) After adjustments, tighten the setscrew

The clearance provided between the blade point of the looper and the needle should be 0 to 0.05 mm.

10. Adjustment of upper feed roller

(1) Adjustment of upper feed roller

1) The standard clearance is 0.08mm minimum to 0.13mm maximum between the lower position of the upper feed

and the upper face of the throat plate

2) The standard front/rear and right/left clearances shall be uniform between the upper feed roller

shall be free from right and left rattling, permitting smooth movement up and down. (2) Installation of upper feed roller

and insert the upper feed roller pressing shaft

in the frame shaft hole of the upper feed roller frame set

Then, tighten the setscrew

Simultaneously at that time, insert the lever connecting section

in between the roller connecting section

2) Install the roller pressure adjusting screw

3) Confi rm that a standard clearance (Clearance gauge:

0.08mm to 0.13mm) is secured between the upper feed roller

and the upper face of the throat plate

4) Confi rm that there is proper pressure at the upper

, enough to feed the material cloth.

Turning the roller pressure adjusting screw

clockwise causes the pressure to increase.

Turning the roller pressure adjusting screw

counterclockwise causes the pressure to decrease.

1. Confi rm that the upper feed roller press-

can be raised by both hands when installing the roller pressure ad- justing screw

touches the throat plate

and there is too much pressure, this will be a cause of cutting off the chain-off thread.

3. If the clearance is too much between the

and the throat plate

, this will be a cause of failure in sup- plying the chain-off thread.

too weak for the material cloth, uneven feeding may arise.

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 39 − (5) Adjustment to eliminate right and left rattling in the upper feed roller If there is a lateral play in upper feed roller

and adjust so that roller bar guide plate

is securely held with right and left guide plates

, while eliminating the lateral play. Then, tighten setscrews

(4) Adjustment of parallelism between upper feed roller and feed dog Loosen setscrews

clockwise or counterclockwise, check to be sure that an equal clearance is provided between upper feed roller

and the front, rear, right and left sides of feed dog

. Then, tighten setscrews

The right/left clearance between the upper feed roller

shall be confi rmed while the feed dog

is positioned at the highest level. (3) Clearance adjustment between upper feed roller and throat plate

1) If the adjusted standard clearance is not correct, loosen two setscrews

to place a clearance gauge between the top face of throat plate

and the bottom of upper feeder roller

. Then, lower pressing shaft

2) Tighten two setscrews

3) In the state as seen from behind, confi rm that the vertical clearance of the upper feed roller

is maintained at the standard level in conjunction with the throat plate

4) In the state as seen from behind, confi rm that the front and rear right/left clearances on the right side of the upper feed roller

are uniformly maintained in conjunction with the feed dog

Standard clearance toward the throat plate

Frame shaft hole of the upper feed roller Right and left directions Vertical direction 5− 40 −

11. Adjustment of needle thread path

(1) Adjustment of needle thread path The needle thread adjusting thread path

is installed just under the needle thread guide

so that there is no sag of the needle thread that passes through the lever thread path

from the needle thread adjusting thread path

when the needle bar is positioned at the upper dead point. (2) Height of needle thread adjusting path The standard dimension from point "A" under the hole in needle thread path guide

to point "B" under the hole in needle thread adjusting path

is 27 mm. To especially tense the needle thread, adjust the distance from point "C" under the hole in needle thread path guide

point "D" under the hole in needle thread adjusting path

to approximately 36 mm. (3) Height of needle thread support adjust plate When the needle bar rests at its lower dead point, the standard dimension from the upper end "F" of needle thread lever thread path

to the upper end "E" of needle thread support adjust plate

is 1.6 mm. Standard dimension for tightening the needle thread Standard dimension 27mm 36mm

Needle thread rocking thread take-up lever

Needle bar at the upper dead point Needle bar at the lower dead point

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.− 41 − (4) Mounting position of needle thread adjusting path

1) Mount the needle thread path guide

, and tighten the setscrew

2) Mount the needle thread adjusting path

in the needle thread path guide

Measure the standard dimension (27mm) and tighten the setscrew

Raising the needle thread adjusting path

causes the needle thread to be loosened.

Lowering the needle thread adjusting path

causes the needle thread to be tightened.

1. When the two setscrews

are loosened and the needle thread support adjust plate

is moved vertically, it is possible to change the height of "F" and that of "E."

2. If there is no coincidence between position of each thread path

and that of the needle thread support adjust plate

, this can be a cause of problems such as stitch skipping, thread breakage, and worse tightening of the needle thread. (5) Mounting position of needle thread support adjust plate

1) Let the lever thread path

stay at the lower dead point.

2) Loosen two setscrews

of the needle thread support adjust plate

and move the needle thread support adjust plate

vertically. Measure the standard dimension (1.6mm) and fasten two setscrews

Raising the needle thread support adjust plate

causes the needle thread loop to be enlarged.

Lowering the needle thread support adjust plate

causes the needle thread loop to be diminished.− 42 −

12. Adjustment of looper thread cam

(1) Adjustment of looper thread cam The standard positioning is secured when the pulley

is turned counterclockwise and the fi rst setscrew

of the looper thread cam

and another fi rst setscrew

are aligned to the same line. When two main shaft setscrews

are turned counterclockwise, the fi rst screw functions as the main shaft contact setscrew

(2) Adjustment of looper thread cam

1) Open the center top cover

, and remove the cam thread path base

counterclockwise and confi rm whether the fi rst looper thread cam setscrew

stays on the same line with the fi rst setscrew

seems to be displaced, loosen two setscrews

and turn the looper thread cam

forward and backward for adjustment. Then, tighten the setscrew

Subsequently, tighten another setscrew

1. The looper thread cam

can be adjust- ed through the peep window. However, since the inside is dark, a proper light (pen light or the like) should be used during adjustments.

2. If the standard position is not secured

for the looper thread cam

, this can be a cause of stitch skipping.

3) Install the cam thread path base

so that it does not touch the right and left faces of the looper thread cam

. Then, tighten the setscrew

At the time of looper thread cam

adjust- ments, do not move the looper thread cam

to the right and left. If it is moved to the right and left, the looper thread cam

may come in contact with the right/left side face of the cam thread path base

groove. Rotating direction Same line Looper thread cam adjustment and peep window

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

13. Adjustment of tension disk fl oating

(1) Adjustment of tension disk fl oating The standard positioning is such that tip of the disk fl oating pin

comes in contact with the upper tension disk

rises by 1.0mm above the upper face of the throat plate

and that the upper tension disk

keeps fl oating when the upper feed roller

rises further. The standard size is 6.5mm between the tip of the disk fl oating pin

and the upper face of the thread guide

(2) Adjustment of tension disk fl oating

1) Insert a screwdriver in the groove of the tension

and loosen the setscrew

. Then, turn the tension fl oating shaft

2) Adjust height of the disk fl oating pin

to 6.5mm and tighten the setscrew

1.0mm Top surface of the throat plate 6.5mm

If proper positioning is not secured for the disk fl oating pin

, the needle thread and/or the looper thread cannot be pulled out when this action is needed.

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine. 8− 44 −

14. Adjustment of folder

in the center of the slide plate

of the right and left cylinder arms, and slide the presser

in forward direction. At that time, a standard clearance of 0.8mm to 1.6mm should be secured between the front section "A" of the presser

and the outlet section "B" of the upper folder

If Section "B" of the upper folder

is installed as closer as possible to Section "A" of the presser

, the result of sewing tends to be more stabilized for the material to be sewn. In such a case, however, it is necessary to make sure not to let the upper folder

come in contact with the presser

in the middle of sewing. (2) Adjustment of folder mounting position

1) When the folder set

is installed, confi rm whether a standard clearance is secured between the front section "A" of the presser

and the outlet section "B" of the upper folder

If the conditions seem to be awkward in regard to the front and rear contact between the front section "A" of the presser

and the outlet section "B" of the upper folder

and right and left positioning of the upper and lower folders (

), loosen two setscrews

and adjust front/rear and right/left positioning of the folder base

1. According to the thickness of a material

to be sewn, adjust the upper and lower folders (

In addition, for the kinds of folder sets

there are folder sets

other than the standard folder. Refer to "14. (3) Folder types".

is inac- curate, the quality of the sewn product will be lowered.

is fastened to the right side section of the lower folder

by means of the setscrew

The tip section of the lower folder

is devised to have an escape recess somewhat to the right so that an extra-heavyweight material can be duly handled.

2) If it is necessary to adjust the outlet at the tips of the

upper and lower folders (

), loosen two setscrews

and make adjustments by moving the tip of the upper folder

to the right and left.

To widen the outlets of the upper and lower folders (

), move the tip of the upper folder

To narrow the outlets of the upper and lower folders (

), move the tip of the upper folder

to the right. Right and left directions Longitudinal directions

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

6− 45 − (3) Folder types Select an optimal folder according to nature, thinness, and thickness of the material cloth. No. JUKI part No. : US part No. : Outlet dimensions Folder features

3.2mm A standard type provided with a spring, suitable for a product that has step sections in the material cloth. (Stanadard)

2.4mm Same as the standard type. The outlet section at the folder tip is narrow, and suitable for medium-weight materials.

4.0mm Same as the standard type. The outlet section at the folder tip is wide, and suitable for extraheavyweight materials.

3.2mm The folder tip section is shorter than that of the standard type. Functionally same. A shorter type assures easier control of materials. Folder asm. Inlet Outlet

With differential feed Without differential feed Insert folder

. After insertion, loosen setscrews

(eight setscrews for sewing with the differential feed or six ones for sewing without the differential feed) to adjust so that the folder slides smoothly with no play.− 46 −

15. Cleaning the sewing machine head

Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the sewing machine.

1) Be sure to remove cloth chips from around the looper

before they accumulate. Open looper cover

. Remove cloth chips accumulated around the looper with tweezers. Sewing machine head with the differential feed mechanism If the sewing machine is kept being driven after oil splashing has stopped, the oil pipe will be clogged with cloth chips. This eventually disables oiling. If such a trouble occurs, entire cleaning of the inside of the pipe is required. So, be extremely careful. If cloth chips which accumulate around the looper are left without being removed, they are more likely to enter inside the sewing machine. Ingress of cloth chips into the inner section of the sewing machine can cause the oil tank fi l- ter to be clogged earlier than usual, leading to faulty oiling. Such a phenomenon can eventu- ally cause abnormal abrasion or seizure of the sewing machine components. So, be extremely careful not to leave cloth chips around the looper.

2) Periodically remove cloth chips accumulated in the fi lter.

As a guide, cleaning is necessary when the amount of oil splashing against the oil circulation identifi cation window decreases. If splash of oil is not observed, even for a second, at the time of startup of the sewing machine, be sure to remove cloth chips from the fi lter.

3) The fi lter cleaning procedure differs by the type of

sewing machine head, i.e., the sewing machine head provided with the differential feed mechanism and the one without it. Be sure to drain the oil from the machine head before starting cleaning. [For the sewing machine head with the differential feed mechanism] Remove four screws with screwdriver

Remove cloth chips from the top of fi lter

. At this time, as fi lter

is detachable, remove cloth chips also from inside oil tank

. After the completion of cleaning, re-tighten the four screws to secure the fi lter. [For the sewing machine head without the differential feed mechanism] Remove cylinder side cover

. Remove six setscrews

can be observed inside the sewing machine. Remove cloth chips which have adhered on the fi lter with tweezers. After the completion of cleaning, re-secure cylinder side cover

※ This procedure applies to the sewing machine mounted with part

(No. 40098071 (+EA9500B0000)). Those parts can be mounted on the sewing machine which is not provided with them. Sewing machine head without the differential feed mechanism

Check and corrective measuresTrouble Cause (1) Cause (2)

1. Thread breakage 1-1) Threading

1-A) Thread jamming at thread guide, threading error Refer to “

- 5. How to conduct threading". 1-2) Thread path Take measures to remove fl aws, burrs, etc., and fi nish the thread path neatly. In this case, however, the lower looper, throat plate, looper thread cam, and such important parts should be replaced if their shapes seem to have changed. 2-A) Flaws, burrs, rust generation, and the like can be a cause of resistance in operation if they are present in needles, throat plate, small thread tension, needle thread rocking thread path, needle thread guide thread path, lower looper, looper thread guide pipe, looper thread cam, lower thread path guide, and thread tension disc. 1-3) Rear needle guard Replace the needle, and replace the part if the rear needle guard is worn. 3-A) If contact between the needle and rear needle guard is excessive, needle grooves are created on he rear needle guard, resulting in thread cut. 1-4) Needle Use an appropriate needle. 4-A) The needle is too thin for the thread that is now used. 1-5) Needle heat Reduce the needle size. Reduce the sewing speed. Use needle cooling air. 5-A) Thread cut occurs because of heated needle depen ding on the material type, the number of superimposed materials, and sewing speed. 1-6) Thread 6-A) Poor quality of the thread Use a high-quality thread. 1-7) Thread tension 7-A) Excessive thread tension Reduce the thread tension. Thread tension is excessive because the needle thread adjusting thread path has been lowered too much. 1-8) Contact Set the lower looper in the proper position.8-A) The lower looper touches the feed dog or throat plate because of an improper lower looper position. The looper touches the rear needle guard because of insuffi cient looper return. 1-9) Idle loop error Set the lower looper in the proper position.9-A) Coordination is awkward between needle and looper timing. Position of the looper thread cam is inadequate. Clearance is too much between the upper feed roller and the upper face of the throat plate.− 48 − Check and corrective measuresTrouble Cause (1) Cause (2)

3. Needle breakage 3-1) Needle entry Refer to the standard adjustment values.1-A)

Front/rear and right/left needle entry seems to be awkward in conjunction with the needle hole of the throat plate. 3-2) Interference between lower looper and blin dstitch of needle 2-A) The needle breaks because of the interference between the tip of the lower looper and the needle. Adjust the lower looper to prevent the interference. Refer to the standard adjustment values. 3-3) Interference between rear of lower looper and needle tip 3-A) The needle breaks because of the strong interference between the rear of the lower looper and the needle tip.

- 6. Adjust the looper movement locus. Refer to the standard adjustment values. 3-4) Rear needle guard 4-A) Excessive clearance between the needle and rear needle guard causes needle shaking and then interference between the needle and the lower looper tip resulting in needle breakage. Adjust the clearance between the needle and rear needle guard. Refer to the standard adjustment values. 3-5) Needle size 5-A) For the case that the needle is too thin for the material that is now used Use a thicker needle. 3-6) Thread tension 6-A) Excessive needle thread tension Reduce the needle thread tension. 3-7) Feed dog height 7-A) Too high feed tooth causes needle sidewise movement resulting in needle breakage. Refer to the standard adjustment values.

2. Thread cut at bobbin

thread looper 2-1) Thread path Take measures to remove fl aws, burrs, etc., and fi nish the thread path neatly. In this case, however, the throat plate, lower looper, looper thread cam, and such important parts should be replaced if their shapes seem to have changed. 1-A) Resistance is developed when there is a scratch, a burr, or rust on the throat plate, lower looper, looper thread cam, looper thread path pipe, looper thread path guide, or thread tension disc. Refer to the standard adjustment values. 2-2) Adjustment of looper thread cam 2-A) Excessive tension is provided because of improper timing of the looper thread cam. 2-3) Thread tension Reduce the tension in consideration of the tension balance with the needle thread. 3-A) Excessive thread tension 2-4) Thread Use a high-quality thread.4-A) Poor quality of the thread 2-5) Needle heat 5-A) Thread cut occurs when the thread touches the right needle at sewing stop due to needle heat. Reduce the sewing speed.− 49 −

4. Needle edge blunting 4-1) Needle entry 1-A)

Front/rear and right/left needle entry seems to be awkward in conjunction with the needle hole of the throat plate. Refer to the standard adjustment values. 4-2) Rear needle guard Clearance check between rear needle guard and needle Refer to the standard adjustment values. 2-A) Improper position of the front-to-rear direction 4-3) Contact with the rear of the looper 3-A) Too often contact between the rear of the lower looper and the needle tip

- 6. Adjust the looper movement locus to make the contact level appropriate when the lower looper moves backward. Refer to the standard adjustment values. Check and corrective measuresTrouble Cause (1) Cause (2)− 50 − Check and corrective measures Trouble (1) Cause (1) Cause (2)Trouble (2)

5-1) The looper does not scoop the needle thread. 1-A) Looper A-1) The blade shape is not proper. Regular parts are used 1-B) Needle B-1) Needle bent or wrong mounting direction Replacement of needles and installation of the needle hole section in the front shall be carried out correctly. UY130GS 1-C) Needle thread holder C-1) Improper loop timing due to no use of the needle thread holder Use the needle thread support plate to adjust the height properly. Refer to the adjustment values. 1-D) Needle thread adjusting path D-1) Height of the thread path is insuffi cient. Adjust the height properly. Refer to the adjustment values. 1-E) Needle height E-1) Improper needle bar height Adjust the height properly. Refer to the adjustment values. 1-F) Threading F-1) Threading error Refer to "

- 5. How to conduct threading". 1-G) Needle heat G-1) This problem occurs in a thick area of the denim material cloth. Use needle cooling air. Refer to the adjustment values. 1-H) Lower looper adjustment Reduce the looper return. Refer to the adjustment values. H-1) Improper clearance or excessive looper return 1-I) Rear needle guard I-1) Improper height or contact level Height of main feed dog and longitudinal position check Refer to the adjustment values. To the next page− 51 − 5-2) Chain stitch unthr eading 2-A) Needle A-1) Needle bent or mounting error Replace the needle, or mount the needle hole in the front correctly. Then, insert the needle to the up end of the needle mounting hole of the needle stopper. UY130GS 2-B) Needle height B-1) Improper needle bar height Needle bar height and looper drawing amount check Refer to the adjustment values. 2-C) Threading C-1) Threading error Refer to "

- 5. How to conduct threading". 2-D) Lower looper D-1) Improper lower looper mounting angle Insuffi cient lower looper drawing amount Make the lower looper mounting angle proper or increase the drawing amount (in the fl at mounting range). 2-E) Lower looper adjustment E-1) Insuffi cient contact level between the needle and the rear of the lower looper Adjustment of looper movement locus Refer to the adjustment values. 2-F) Thread tension F-1) Insuffi cient thread tension Increase the tension. 2-G) Needle thread holder G-1) Excessive height of thread holder position Refer to the adjustment values 5-3) Poorly tense stitches for needle thread 3-A) Needle A-1) Needle top blunting, needle bent, check the needle in use. Replace the needle. UY130GS 3-B) Lower looper B-1) Lower looper brade point blunting or insuffi cient polishing Replace any item if it has been modifi ed or its shape has changed. 3-C) Needle height C-1) Improper needle bar height Refer to the adjustment values. 3-D) Threading D-1) Threading error Refer to "

- 5. How to conduct threading". To the next page (Chain stitch) The needle thread caught on the looper is unthreaded before the needle lowers and enters the needle thread loop. (unthreading) The needle thread loop caught on the looper is fully unthreaded before the needle lowers. Check and corrective measures Trouble (1) Cause (1) Cause (2)Trouble (2) From the previous page 3-E) Needle thread tension E-1) Insuffi cient thread tension Increase the thread tension. 3-F) Lower looper thread tension F-1) Excessive thread tension Reduce the thread tension. 3-G) Bobbin thread guide path G-1) Insuffi cient take- up amount of the bobbin thread Increase the take-up amount of the bobbin thread. 3-H) Looper thread cam H-1) Delayed looper thread cam position Advance the looper thread cam position to the proper level.− 52 − From the previous page 5-4) Sewing jam 4-A) Regulating spring of presser bar pressure A-1) Insuffi cient presser bar pressure Adjust the presser bar pressure properly. 4-B) Feeder height B-1) Extremely low feeder Make the feeder height proper. Refer to the standard adjustment values. 4-C) Pressure regulating spring of upper feed roller C-1) Insuffi cient pressure adjustment Adjust it to an appropriate value. Refer to "Adjustment of drawing amount of upper feed roller." 4-D) Upper feed roller D-1) Insuffi cient drawing amount Adjust the drawing amount properly. 5-5) Problems with chain-off thread 5-A) Throat plate A-1) Not smooth thread running due to blunt throat needle hole Perform modifi cation or replace the deformed part. 5-B) Lower looper adjustment B-1) Lower fancy stitch skipping due to insuffi cient lower looper adjustment Refer to the adjustment values. 5-C) Needle thread tension C-1) Insuffi cient needle thread tension Increase the thread tension. 5-D) Threading D-1) Threading error Refer to "

- 5. How to conduct threading". 5-E) Drawing amount of upper feed roller E-1) The thread drawing amount is insuffi cient. Increase the thread drawing amount. Refer to the adjustment values. 5-F) Clearance toward the upper feed roller F-1) Clearance is too much between the upper feed roller and the upper face of the throat plate. Adjust the clearance to a standard level. Refer to the adjustment values. 5-G) Pressure regulating spring of upper feed roller G-1) Insuffi cient pressure adjustment Adjust the presser bar presspring sure properly. Check and corrective measures Trouble (1) Cause (1) Cause (2)Trouble (2) Change the brake spring (Part No.: 40068599) with a new one. C-2) The brake spring is permanently set in fatigue. D-2) The gear and key have worn out. Change the gear (Part No.: 40068562/40068563) with a new one. Change the key (Part No.: 40068560) with a new one. 4-E) Play in the presser foot E-1) The cap screw has deformed, causing an inconsistent pressure of the presser foot. Change the cap screw (Part No.: 40070193) with a new one.− 53 −

DRAWING OF THE TABLE

2×ø3.4 on the bottom surface depth 10 (For pedal switch)

2×ø3.4 on the bottom surface depth 10 (For CP-18)

6×ø3.4 on the bottom surface depth 10 (For power switch)

TABLE MACHINING DIAGRAM (only for the sewing machine provided with a clutch motor) (Note) The JUKI exclusive mounting base is regarded as a product with the model name "MT05." The above table is the table machining drawing using the MT05. It should be noted, however, that only one cushion rubber is to be used though the MT05 is provided with two of them. Mounting screws and washers are supplied with the mount base.

• Mounting screw SM6087002 TN (M8) 4 pcs/; Washer WP0841600SC 4 pcs.

Clutch-motor mounting location (3 x φ10)

Through-hole for chain of presser foot lifting pedal

Mount base mounting hole (4 x φ10)

%HL%HUKUXQJHLQHVKHLHQ7HLOV

fer (Inbusschlüssel (3 mm)

QDTXHKD\DVLGRPRGL¿FDGDRDOWHUDGD

Subsequently, tighten another setscrew

7HPSHUDWXUDGHOODPELHQWHRSHUDWLYR GDL&DL&

SEWING MACHINERY BUSINESS UNIT

• All rights reserved throughout the world.