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USER MANUAL MF7200D JUKI
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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
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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
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ENGLISH 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 :
ENGLISH 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 :
themachineisinoperation. 2.Neverbringyour fingers, hairor clothescloseto the pulleyandneedleor place anythingonthepulleyandundertheneedlewhilethemachineisinoperation. 3.Never operate themachinewiththe safety devicessuchasbelt cover, needle bar threadtake-upcover,ngerguard,eyeguardcover,etc.removed.
5. Neveroperatethe sewing machine with thegroundwireforthe powersupply
removedsoastoensuresafety.
thereceptaclesoastoensuresafety.
- Conrmthatthevoltageandphasearecorrect.
. SPECIFICATIONS Model name Semi-dry head high-speed, small cylinder-bed coverstitch machine Model MF-7200D series Stitch type ISO standard 406, 407, 602, and 605 Example of application Hemming and covering for knits and general knitted fabrics Max. speed of stitch Max. 4,000 sti/min (at the time of intermittent operation) Needle gauge 3-needle ... 5.6 mm and 6.4 mm 2-needle ... 3.2 mm, 4.0 mm and 4.8 mm Differential feed ratio 1 : 0.8 to 1 : 1.8 (stitch length : less than 3.2 mm) Micro-differential feed adjustment mechanism is provided. (Micro-adjustment) Stitch length
1.4 mm to 3.2 mm (can be adjusted up to 4.2 mm)
Needle UY128GAS #9S to #12S (standard #10S) Needle bar stroke 31mm Dimensions (Height) 450 x (Width) 444 x (Length) 285 Weight 42 kg Lift of presser foot 6 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering) Micro-lifter mechanism is provided. Feed adjustment method Main feed ... dial type stitch pitch adjustment method Differential feed ... lever adjustment method
(micro-adjustment mechanism is provided.) Looper mechanism Spherical rod drive method Lubricating system Forced lubrication method by gear pump Lubricating oil
Oil reservoir capacity Oil gauge lower line : 600 cc to upper line : 900 cc Installation Top mount type, Semi-submerged type Noise - Equivalent continuous emission sound pressure level (L
) at the workstation : A-weighted value of 80.5 dB; (Includes K
A-weighted value of 86.0 dB; (Includes K
Presser spring regulator Differential lock nut Needle bar thread take-up cover Micro-adjustment knob Oil circulation inspection windows Finger guard Oil hole cap Thread trimming knife Micro-lifter Rocking thread take-up receiver Needle thread silicon oil lubricating unit Rocking thread take-up Thread guide No. 1 Front cover Upper pulley Needle bar thread take-up thread receiver Thread tension nut
Rocking thread take-up thread guide Oil gauge Silicon container thread guide Feed regulating knob Belt cover Eye guard cover Differential feed regulating lever Throat plate
. INSTALLATION Topmounttype Attach the pins and the rubber cushions as shown in the illustration and properly install the sewing machine. Rubber cushion (Black) x 3 Washer Spring washer 4 Nut5 Pin6Rubber cushion (Gray) x 1 Attach the supporting board and the rubber seats as shown in the illustration and properly install the sewing machine.1 Bolt2 Spacer3 Washer4 Spring washer5 Nut6 Supporting board7 Spring pin 8 Rubber cushion (Black) x 39 Rubber cushion (Gray) x 1 Semi-submergedtype
Presser spring regulator Differential lock nut 2 Needle bar thread take-up cover!5 Micro-adjustment knob Oil circulation inspection windows Finger guard Oil hole cap Thread trimming knife Micro-lifter Rocking thread take-up receiver Needle thread silicon oil lubricating unit Rocking thread take-up 7Thread guide No. 1@0 Front cover8 Upper pulley@1 Needle bar thread take-up thread receiver9Thread tension nut@2 Rocking thread take-up thread guide Oil gauge Silicon container thread guide Feed regulating knob @4Belt cover!2Eye guard cover@5 Differential feed regulating lever !3 Throat plate
. INSTALLATION TopmounttypeAttach the pins and the rubber cushions as shown in the illustration and properly install the sewing machine. Rubber cushion (Black) x 3 Washer Spring washer
Rubber cushion (Gray) x 1Attach the supporting board and the rubber seats as shown in the illustration and properly install the sewing machine. Bolt Spacer Washer Spring washer
Supporting board Spring pin Rubber cushion (Black) x 3 Rubber cushion (Gray) x 1Semi-submergedtype
. SPECIFICATIONS Model name Semi-dry head high-speed, small cylinder-bed coverstitch machine Model MF-7200D series Stitch type ISO standard 406, 407, 602, and 605 Example of application Hemming and covering for knits and general knitted fabrics Max. speed of stitch Max. 4,000 sti/min (at the time of intermittent operation) Needle gauge 3-needle ... 5.6 mm and 6.4 mm 2-needle ... 3.2 mm, 4.0 mm and 4.8 mm Differential feed ratio 1 : 0.8 to 1 : 1.8 (stitch length : less than 3.2 mm) Micro-differential feed adjustment mechanism is provided. (Micro-adjustment) Stitch length
1.4 mm to 3.2 mm (can be adjusted up to 4.2 mm)
Needle UY128GAS #9S to #12S (standard #10S) Needle bar stroke 31mm Dimensions (Height) 450 x (Width) 444 x (Length) 285 Weight 42 kg Lift of presser foot 6 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering) Micro-lifter mechanism is provided. Feed adjustment method Main feed ... dial type stitch pitch adjustment method Differential feed ... lever adjustment method
(micro-adjustment mechanism is provided.) Looper mechanism Spherical rod drive method Lubricating system Forced lubrication method by gear pump Lubricating oil
Oil reservoir capacity Oil gauge lower line : 600 cc to upper line : 900 cc Installation Top mount type, Semi-submerged type Noise - Equivalent continuous emission sound pressure level (L
) at the workstation : A-weighted value of 80.5 dB; (Includes K
A-weighted value of 86.0 dB; (Includes K
as shown in the illustration.
arethexingscrewsforbeltcover
has a shorter shank than
- When the semi-submerged type table is used with the machine, cover
to presser bar lifting lever
2) Hook the other side of the chain
supplied as accessories on the machine arm with screws
on thread guide No. 1
Besuretoinstallthebeltcover.Ifitisnotinstalled,thereisadangerofinjurysincehandsorclothes maybe caughtin themachine ora dangerof damageof themachine sincesewing productsmay be caughtinthemachine.
2) Install the motor so that the pulley rotates clockwise.
Mot or pulley 40˚ 5.5mm 10mm MtypeVbelt Use a clutch motor of 3-phase, 2-pole, 400 W (1/2HP). Use the M type V belt.
1) The motor pulley shifts to the left-hand side when
depressing the pedal. At this time, install the motor so that the centers of motor pulley and lower pulley align with each other.
- For the installing procedure of the motor pulley, refer to the Instruction Manual for motor. Lower pulley
, set the other side of the belt to motor pulley
3) Adjust the belt tension so that the belt sags 15 to 20
mm when the center of the belt is pressed with an approximate 10N (1.02 kgf) load.
when the belt has been set. Ifthedeectionofthebeltisexcessivewhen thesewingmachineisoperated,checkagain thebelttension. 15to20mm
- The table shows the numbers when a 3-phase 2-pole 400 W clutch motor (1 / 2 HP) is used.
2) Install the motor so that the pulley rotates clockwise.
Mot or pulley 40˚ 5.5mm 10mm MtypeVbelt Use a clutch motor of 3-phase, 2-pole, 400 W (1/2HP). Use the M type V belt.
1) The motor pulley shifts to the left-hand side when
depressing the pedal. At this time, install the motor so that the centers of motor pulley and lower pulley align with each other.
- For the installing procedure of the motor pulley, refer to the Instruction Manual for motor. Lower pulley
, set the other side of the belt to motor pulley
3) Adjust the belt tension so that the belt sags 15 to 20
mm when the center of the belt is pressed with an approximate 10N (1.02 kgf) load.
when the belt has been set. Ifthedeectionofthebeltisexcessivewhen thesewingmachineisoperated,checkagain thebelttension. 15to20mm
- The table shows the numbers when a 3-phase 2-pole 400 W clutch motor (1 / 2 HP) is used.
2– 8 – 5.Installingthebeltcover Install belt cover
as shown in the illustration.
arethexingscrewsforbeltcover
has a shorter shank than
- When the semi-submerged type table is used with the machine, cover
to presser bar lifting lever
2) Hook the other side of the chain
supplied as accessories on the machine arm with screws
on thread guide No. 1
Besuretoinstallthebeltcover.Ifitisnotinstalled,thereisadangerofinjurysincehandsorclothesmaybe caughtin themachine ora dangerof damageof themachine sincesewing productsmay becaughtinthemachine.
46360– 12 – 4.Adjustingthestitchlength Thestitchlengthcanbeinnitelyadjustedfrom0.8mm to 3.2 mm.
- The actually sewn stitch length varies in accordance with kind and thickness of the materials. [Howtochangethestitchlength] Turn clockwise feed regulating knob
to increase the stitch length. Turn it counterclockwise to decrease the stitch length.
and turn clockwise feed regulating knob
to regulate the stitch length. Push pin
Use the machine within the range where feed dogs or feed dog and throat plate do not come in contact with each other.
to increase the differential feed ratio. Then the sewn material is gathered. Move lever
down to decrease the differential feed ratio. Then the sewn material is stretched. Fine adjustment of the differential feed ratio can be performed with micro-adjustment knob
– 9 – ENGLISH <Whenusingthesewingmachineforthersttime> Lubricating oil has been taken out at the time of deliv
ery. Be sure to supply lubricating oil before using the sewingmachineforthersttime.
on which “OIL” is indicated and lltheoilreservoirwithlubricatingoiluptothelevel between the upper and lower engraved marker lines. <Checkingbeforeusingthesewingmachine>
and make sure that lubricating oil level is between the upper and lower two lines. When lubricating oil level lowers below the lower line, supply lubricating oil.
2) Make sure that lubricating oil comes out from the
when rotating the sewing machine. When lubricating oil does not come out, perform “Inspecting and replacing theoillter”.(Seepage22.)
Oiling The mechanisms inside the frame such as the needle bar, presser lift and spreader components are lubri
cated with grease. Never add oil inside the frame. Ifinsideoftheframeisoiled,thegreasewillbeexpelled,resultinginmechanicalfailure. 3.Replacingthelubricatingoil
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefollowingworkafterturningthepoweroffandascertainingthatthemotorisatrest. In case of the new sewing machine, replace the lubri- cating oil (JUKI MACHINE OIL 18) with new one after using it for approximately one month. Then replace the lubricating oil every six months.
1) Set a container to receive the lubricating oil under
2) Remove drain screw
. The lubrication oil is drained.
3) After the drain, wipe out the oil and attach the drain
MF-7200D 1– 10 – This sewing machine is provided with the silicon oil lubricating unit as standard. In case of sewing at a high speed, or using chemical thread or chemical fabric, use the silicon oil lubricating unit to prevent thread break age or stitch skipping. Oil used is silicon oil (dimethyl silicon).Open cover of silicon oil reservoir . Check to be sure that silicon oil reservoir for the needle thread is lledwithsiliconoil.Ifsiliconoilisinsufcientthere,supply it (dimethyl silicon). Whensiliconoiladheredtothecomponentsotherthanthesiliconoillubricatingunit,besuretowipeitout.Ifthecomponentstowhichsiliconoiladheredarekeptwithoutwipingouttheoil,sewingmachinetroublewillbecaused.
. OPERATION 1.Needle The needle used for this sewing machine is UY128GAS. For the needle No., select a proper needle in accordance with the sewing conditions.Japan No. 9 10 11 12 14German No. 65 70 75 80 90 2.Attachingtheneedle
of needle with a screwdriver.2) Hold the new needle with indented part facing to the rear and insert it into the hole in needle clamp
un- til the end of hole is reached.3) Securely tighten setscrew of the needle.
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol-lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest. – 11 – ENGLISH 3.Threadingthemachinehead (1)Standardthreading Thread the machine head according to the following threading illustrations. When usingmorestretchable thread
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol- lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest.Ifthreadingiswrong, stitchskipping,threadbreakage,needlebreakageorirregularstitcheswillbecaused.So,becareful. 1423– 10 – This sewing machine is provided with the silicon oil lubricating unit as standard. In case of sewing at a high speed, or using chemical thread or chemical fabric, use the silicon oil lubricating unit to prevent thread break age or stitch skipping. Oil used is silicon oil (dimethyl silicon). Open cover 2 of silicon oil reservoir
sure that silicon oil reservoir for the needle thread is lledwithsiliconoil.Ifsiliconoilisinsufcientthere, supply it (dimethyl silicon).
. OPERATION 1.Needle The needle used for this sewing machine is UY128GAS. For the needle No., select a proper needle in accordance with the sewing conditions. Japan No. German No.
2.Attachingtheneedle
2 of needle 1 with a screwdriver.
2) Hold the new needle with indented part facing to the
rear and insert it into the hole in needle clamp 3 un- til the end of hole is reached.
3) Securely tighten setscrew
3– 12 – 4.Adjustingthestitchlength Thestitchlengthcanbeinnitelyadjustedfrom0.8mm to 3.2 mm.
- The actually sewn stitch length varies in accordance with kind and thickness of the materials. [Howtochangethestitchlength] Turn clockwise feed regulating knob
to increase the stitch length. Turn it counterclockwise to decrease the stitch length.
and turn clockwise feed regulating knob
to regulate the stitch length. Push pin
Use the machine within the range where feed dogs or feed dog and throat plate do not come in contact with each other.
to increase the differential feed ratio. Then the sewn material is gathered. Move lever
down to decrease the differential feed ratio. Then the sewn material is stretched. Fine adjustment of the differential feed ratio can be performed with micro-adjustment knob
– 9 – ENGLISH <Whenusingthesewingmachineforthersttime> Lubricating oil has been taken out at the time of deliv
ery. Be sure to supply lubricating oil before using the sewingmachineforthersttime.
on which “OIL” is indicated and lltheoilreservoirwithlubricatingoiluptothelevel between the upper and lower engraved marker lines. <Checkingbeforeusingthesewingmachine>
and make sure that lubricating oil level is between the upper and lower two lines. When lubricating oil level lowers below the lower line, supply lubricating oil.
2) Make sure that lubricating oil comes out from the
when rotating the sewing machine. When lubricating oil does not come out, perform “Inspecting and replacing theoillter”.(Seepage22.)
Oiling The mechanisms inside the frame such as the needle bar, presser lift and spreader components are lubri
cated with grease. Never add oil inside the frame. Ifinsideoftheframeisoiled,thegreasewill beexpelled,resultinginmechanicalfailure. 3.Replacingthelubricatingoil
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefollowing workafterturningthepoweroffandascertainingthatthemotorisatrest. In case of the new sewing machine, replace the lubri- cating oil (JUKI MACHINE OIL 18) with new one after using it for approximately one month. Then replace the lubricating oil every six months.
1) Set a container to receive the lubricating oil under
2) Remove drain screw
. The lubrication oil is drained.
3) After the drain, wipe out the oil and attach the drain
MF-7200D 1– 16 – 6.Adjustingthelooperthreadcamthreadguideandthelooperthreadcam [Adjustingthelooperthreadcam] Adjust so that thread comes off from the highest place of looper thread cam
when needles come down and the top end of left needle
aligns with the bottom surface of looper
. Then tighten screws
toxthe looper thread cam. [Adjustingthelooperthreadcamthreadguide] When the thread drawing amount is desired to be de
creased in case of 2-needle machine or the like, loosen screws
, move upward thread guides
= Increase 7.Adjustingthelooperthreadwindingpreventionplate
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol- lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest. Adjust so that a clearance of approximately 0 to 0.3 mm is provided between the top end of section
looper thread winding prevention plate
and the end face of looper thread cam
Adjustingthepresserfootpressure
Decrease the presser foot pressure as low as possible to such an extent that stitches are stabilized. To adjust the pressure, loosen lock nut
of presser spring regulator
and turn presser spring regulator
After the adjustment, tighten lock nut
Turning it clockwise to increase the pressure. Turning it counterclockwise to decrease the pressure. 7.Adjustingthethreadtension Adjust the thread tension with the following thread ten- sion nuts.
Top covering thread tension nut
Looper thread tension nut Turn clockwise to increase the thread tension. Turn counterclockwise to decrease the thread tension.
ADJUSTINGTHESEWINGMACHINE 1.Adjustingthesiliconcontainerthreadguide
and adjust so that the dis
tance from the center of the setscrew on the upper side to the bottom end of the thread hole is 10 mm. Then tighten setscrews
and adjust the position from the center of screws
to the center of needle thread guide rod to the extreme right position (43 mm). Then tighten screw
and adjust so that the heights of the respective needle thread guide rods are the dimensions as shown in the table. Then tighten screws
toxthethreadguiderods. A B C Adjustment value 13 mm 16 mm 19 mm 2.Adjustingtheneedlebarthreadtake-upthreadreceiver
and adjust so that the bottom end to the center of the thread hole of needle bar thread take-up
aligns with the top end of needle bar thread take-up thread receiver
when the needle bar is in its lowest position. Then tighten screw
toxtheneedle bar thread take-up thread receiver.
aligns with the bottom end of thread hole
of rocking thread take-up
when rocking thread take-up
5.Adjustingthespreaderthreadguide Adjust so that the top end of thread guide thread path (rear)
aligns with the lowest position of slot of spreader thread take-up
when spreader thread take-up
is in its highest posi- tion. Then tighten screw
3.Adjustingtherockingthreadtake-up
, move rocking thread take-up
to the right or left and adjust so that the distance from the thread hole to the center of rocking thread take-up shaft
lustration. Retighten screws
to fix the rocking thread take-up.
2) Adjust so that rocking thread take-up base
is level when the rocking thread take-up is in its lowest position. Retighten screw
to fix the rocking thread take-up base.
Adjustment value 90 mm
ADJUSTINGTHESEWINGMACHINE 1.Adjustingthesiliconcontainerthreadguide
and adjust so that the dis
tance from the center of the setscrew on the upper side to the bottom end of the thread hole is 10 mm. Then tighten setscrews
and adjust the position from the center of screws
to the center of needle thread guide rod to the extreme right position (43 mm). Then tighten screw
and adjust so that the heights of the respective needle thread guide rods are the dimensions as shown in the table. Then tighten screws
toxthethreadguiderods. A B C Adjustment value 13 mm 16 mm 19 mm 2.Adjustingtheneedlebarthreadtake-upthreadreceiver
and adjust so that the bottom end to the center of the thread hole of needle bar thread take-up
aligns with the top end of needle bar thread take-up thread receiver
when the needle bar is in its lowest position. Then tighten screw
toxtheneedle bar thread take-up thread receiver.
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol- lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest. Extremerightposition
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol- lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest. – 15 – ENGLISH 4.Adjustingtherockingthreadtake-upthreadreceiver Adjust so that the top end of rocking thread take-up thread receiver
aligns with the bottom end of thread hole
of rocking thread take-up
when rocking thread take-up
5.Adjustingthespreaderthreadguide Adjust so that the top end of thread guide thread path (rear)
aligns with the lowest position of slot of spreader thread take-up
when spreader thread take-up
is in its highest posi- tion. Then tighten screw
3.Adjustingtherockingthreadtake-up
, move rocking thread take-up
to the right or left and adjust so that the distance from the thread hole to the center of rocking thread take-up shaft
lustration. Retighten screws
to fix the rocking thread take-up.
2) Adjust so that rocking thread take-up base
is level when the rocking thread take-up is in its lowest position. Retighten screw
to fix the rocking thread take-up base.
Adjustment value 90 mm
4– 16 – 6.Adjustingthelooperthreadcamthreadguideandthelooperthreadcam [Adjustingthelooperthreadcam] Adjust so that thread comes off from the highest place of looper thread cam
when needles come down and the top end of left needle
aligns with the bottom surface of looper
. Then tighten screws
toxthe looper thread cam. [Adjustingthelooperthreadcamthreadguide] When the thread drawing amount is desired to be de
creased in case of 2-needle machine or the like, loosen screws
, move upward thread guides
= Increase 7.Adjustingthelooperthreadwindingpreventionplate
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol-lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest. Adjust so that a clearance of approximately 0 to 0.3 mm is provided between the top end of section
looper thread winding prevention plate
and the end face of looper thread cam
Adjustingthepresserfootpressure
Decrease the presser foot pressure as low as possible to such an extent that stitches are stabilized. To adjust the pressure, loosen lock nut
of presser spring regulator
and turn presser spring regulator
After the adjustment, tighten lock nut
Turning it clockwise to increase the pressure. Turning it counterclockwise to decrease the pressure. 7.Adjustingthethreadtension Adjust the thread tension with the following thread ten- sion nuts.
Top covering thread tension nut
Looper thread tension nut Turn clockwise to increase the thread tension. Turn counterclockwise to decrease the thread tension.
[Spreaderthreadguide] Adjust so that the clearance between spreader thread guide
- Adjust so that the center of slot
aligns with blade point
is in the extreme right position. In addition, allow the spreader thread guide
come near the needle clamp to such an extent that the spreader thread guide does not interfere with the needle clamp. [Needleclampthreadguide] Adjust so that the center of thread hole of needle clamp thread guide
when the needle is in the lowest position.
- At this time, adjust so that the clearance between needle clamp thread guide
and spreader thread guide
is0.8to1.2mm.Thenxtheneedleclamp thread guide with setscrew
15.Adjustingthefrontneedleguard 0.1to0.5mm
0.5mm Adjust the height of front needle guard
so that it is higher by 3.3 ± 0.5 mm than the rear needle guard. Adjust with setscrew
so that the clearance between the needle and front needle guard
is 0.1 to 0.5 mm when looper
travels from the extreme right position to the left and passes the rear side of the respective needles.
- Allow front needle guard
to come to the needle as near as possible within the range where needle thread smoothly passes in accordance with the kind or thickness of thread.
[Lateralposition] The relation between clearance
and the center of right-hand needle and the needle gauge is as shown in the table. Loosen clamp screw
and laterally adjust looper holder
in accordance with the table. [Longitudinalposition] Adjust so that the clearance between blade point
the looper and medium needle
is 0 to 0.05 mm when the top end of the looper comes from the extreme right position to the center of the medium needle. After the adjustment, tighten clamp screw
- The blade point of the looper comes in contact with the right-hand needle when rear needle guard
does not work. So, be careful.
9. Adjustingtheheightoftheneedle
Reference : Height from the top surface of the throat plate
to the top end of left-hand needle,
when the needle is in the higher dead point is as shown in the table.
1) Equally adjust clearance
in the throat plate.
2) Adjust the height of the needle bar so that the top
end of the needle hole of left-hand needle aligns with the bottom end section of the looper when the looper travels to the extreme right end and top end
of the looper protrudes by approximately 1.1 mm from the left end of the left-hand needle, remove the rubber cap
in the face plate, and tighten needle bar bracket setscrew
Adjust the lateral position of rear needle guard
that it receives the needle within the range of
when the needle is in its lowest position.
1) Adjust the height with setscrew
tance from edge line
of rear needle guard
to the top end of right-hand needle is 1.5 to 2 mm when the top end
of the looper comes from the extreme right end to the center of right-hand needle.
2) Make rear needle guard
slightly come in contact with the right-hand needle so that the clearance between right-hand needle and top end
of the looper is 0 to 0.05 mm when top end
of the looper comes from the extreme right end to the center of right-hand needle. In addition, make rear needle guard
slightly come in contact with the medium needle so that the clear
ance between the medium needle and top end
the looper comes to the center of medium needle. Perform the adjustment with setscrews
In case stitch skipping or thread breakage occurs due to excessive large or small needle thread loop even when performing threading in case of using stretchable threads or less stretchable threads described in "Standard threading", change the needle thread drawing timing of the rocking thread take-up and adjust the size of needle thread loop.
forward or backward. The relation between the moving direction and the size of needle thread loop is as shown in the table below.
3) After the adjustment, securely tighten screw
- Clearance between crank
has been factory-adjusted to 4 mm at the time of deliv
ery. (Engraved marker line on rocking thread take- up shaft
aligns with the edge of crank
Size of needle thread loop Note : The adjusting direction becomes reverse by way of threading. So, be careful.
Move forward Move backward In case of threading for standard seams Loop becomes smaller. Loop becomes larger. In case of thread- ing for soft seams Loop becomes larger. Loop becomes smaller.
1.5to2mm – 19 – ENGLISH 12.Adjustingtheheightofthefeeddog
1mm Adjust the height from the top surface of throat plate
to the rear end of main feed dog
to 1 mm when the feed dog comes to its highest position and tighten setscrew
toxthefeeddog. For the height of differential feed dog
, adjust the height of front end
of differential feed dog
, and tighten set- screw
toxthedifferentialfeeddog. It is the standard that throat plate
isushwiththe feed dog when the feed dog is in its highest position. 13.Installingpositionofthespreader 0.1to0.3mm 7.8to8.2mm
4.5to5.5mm 17to18mm [Adjustingtheheight] The height of spreader
is 7.8 to 8.2 mm from the top surface of throat plate
to the bottom surface of the spreader. Adjust the height with clamp screw
and fix the spreader. [Adjustingthelongitudinalposition] Adjust so that the clearance between the spreader and left-hand needle is 0.1 to 0.3 mm when spread
travels from the extreme left position to the right and section
comes to the front of left-hand needle.Thenxthespreaderwithclampscrew
[Adjustingthelateralposition] Adjust so that the distance from the center of left- hand needle to section
is 4.5 to 5.5 mm when the spreader
is in the extreme leftposition.Thenxthespreaderwithclampscrew
Adjust the lateral position of rear needle guard
that it receives the needle within the range of
when the needle is in its lowest position.
1) Adjust the height with setscrew
tance from edge line
of rear needle guard
to the top end of right-hand needle is 1.5 to 2 mm when the top end
of the looper comes from the extreme right end to the center of right-hand needle.
2) Make rear needle guard
slightly come in contact with the right-hand needle so that the clearance between right-hand needle and top end
of the looper is 0 to 0.05 mm when top end
of the looper comes from the extreme right end to the center of right-hand needle. In addition, make rear needle guard
slightly come in contact with the medium needle so that the clear
ance between the medium needle and top end
the looper comes to the center of medium needle. Perform the adjustment with setscrews
In case stitch skipping or thread breakage occurs due to excessive large or small needle thread loop even when performing threading in case of using stretchable threads or less stretchable threads described in "Standard threading", change the needle thread drawing timing of the rocking thread take-up and adjust the size of needle thread loop.
forward or backward. The relation between the moving direction and the size of needle thread loop is as shown in the table below.
3) After the adjustment, securely tighten screw
- Clearance between crank
has been factory-adjusted to 4 mm at the time of deliv
ery. (Engraved marker line on rocking thread take- up shaft
aligns with the edge of crank
Size of needle thread loop Note : The adjusting direction becomes reverse by way of threading. So, be careful.
Move forward Move backward In case of threading for standard seams Loop becomes smaller. Loop becomes larger. In case of thread- ing for soft seams Loop becomes larger. Loop becomes smaller.
1.5to2mm – 19 – ENGLISH 12.Adjustingtheheightofthefeeddog
1mm Adjust the height from the top surface of throat plate
to the rear end of main feed dog
to 1 mm when the feed dog comes to its highest position and tighten setscrew
toxthefeeddog. For the height of differential feed dog
, adjust the height of front end
of differential feed dog
, and tighten set- screw
toxthedifferentialfeeddog. It is the standard that throat plate
isushwiththe feed dog when the feed dog is in its highest position. 13.Installingpositionofthespreader 0.1to0.3mm 7.8to8.2mm
4.5to5.5mm 17to18mm [Adjustingtheheight] The height of spreader
is 7.8 to 8.2 mm from the top surface of throat plate
to the bottom surface of the spreader. Adjust the height with clamp screw
and fix the spreader. [Adjustingthelongitudinalposition] Adjust so that the clearance between the spreader and left-hand needle is 0.1 to 0.3 mm when spread
travels from the extreme left position to the right and section
comes to the front of left-hand needle.Thenxthespreaderwithclampscrew
[Adjustingthelateralposition] Adjust so that the distance from the center of left- hand needle to section
is 4.5 to 5.5 mm when the spreader
is in the extreme leftposition.Thenxthespreaderwithclampscrew
[Spreaderthreadguide] Adjust so that the clearance between spreader thread guide
- Adjust so that the center of slot
aligns with blade point
is in the extreme right position. In addition, allow the spreader thread guide
come near the needle clamp to such an extent that the spreader thread guide does not interfere with the needle clamp. [Needleclampthreadguide] Adjust so that the center of thread hole of needle clamp thread guide
when the needle is in the lowest position.
- At this time, adjust so that the clearance between needle clamp thread guide
and spreader thread guide
is0.8to1.2mm.Thenxtheneedleclamp thread guide with setscrew
15.Adjustingthefrontneedleguard 0.1to0.5mm
0.5mm Adjust the height of front needle guard
so that it is higher by 3.3 ± 0.5 mm than the rear needle guard. Adjust with setscrew
so that the clearance between the needle and front needle guard
is 0.1 to 0.5 mm when looper
travels from the extreme right position to the left and passes the rear side of the respective needles.
- Allow front needle guard
to come to the needle as near as possible within the range where needle thread smoothly passes in accordance with the kind or thickness of thread.
[Lateralposition] The relation between clearance
and the center of right-hand needle and the needle gauge is as shown in the table. Loosen clamp screw
and laterally adjust looper holder
in accordance with the table. [Longitudinalposition] Adjust so that the clearance between blade point
the looper and medium needle
is 0 to 0.05 mm when the top end of the looper comes from the extreme right position to the center of the medium needle. After the adjustment, tighten clamp screw
- The blade point of the looper comes in contact with the right-hand needle when rear needle guard
does not work. So, be careful.
9. Adjustingtheheightoftheneedle
Reference : Height from the top surface of the throat plate
to the top end of left-hand needle,
when the needle is in the higher dead point is as shown in the table.
1) Equally adjust clearance
in the throat plate.
2) Adjust the height of the needle bar so that the top
end of the needle hole of left-hand needle aligns with the bottom end section of the looper when the looper travels to the extreme right end and top end
of the looper protrudes by approximately 1.1 mm from the left end of the left-hand needle, remove the rubber cap
in the face plate, and tighten needle bar bracket setscrew
3– 21 – ENGLISH 16.Adjustingthepresserfootlift
1) To adjust the height of the presser foot, adjust the
so that the presser foot does not comeincontactwithothercomponentsandxthe presser foot with nut
2) Adjust the position of the thrust collar so that the
clearance between thrust collar
and presser bar bushing
is 0.1 mm when the presser foot is lifted. Thenxthethrustcollarwithsetscrew
is turned counterclockwise, micro-lifter stopper
lowers and comes in contact with presser lifting lever
. Then the presser foot goes up. Adjust the height in accordance with the sewing conditions. Whenthemicro-lifterisnotused,turnclockwisemicro-lifterknob andxmicro-lifterstopper atthehighestposition.
MAINTENANCE Open side cover and cylinder cover, right . Re-move screws and then throat plate . Then, clean up the throat plate slits, feed dog teeth and the area surrounding them.Aftercleaning,xthroatplate with setscrews
1.Cleaningthesewingmachine 2.Replacingthelubricatingoil In case of the new sewing machine, replace the lubri-cating oil (JUKI MACHINE OIL 18) with new one after using it for approximately one month. Then replace the lubricating oil every six months.1) Set a container to receive the lubricating oil under drain screw
2) Remove drain screw
. The lubrication oil is drained.3) After the drain, wipe out the oil and attach the drain screw
inspect it.2)Whenoillter is clogged with dust, replace it with a new one. 3) After the replacement, fix the filter cap with screws
MAINTENANCE Open side cover 1 and cylinder cover, right
2. Re-move screws 3 and then throat plate 4. Then, clean
up the throat plate slits, feed dog teeth and the area surrounding them. Aftercleaning,xthroatplate 4 with setscrews 3. 1.Cleaningthesewingmachine 2.Replacingthelubricatingoil In case of the new sewing machine, replace the lubri- cating oil (JUKI MACHINE OIL 18) with new one after using it for approximately one month. Then replace the lubricating oil every six months.
1) Set a container to receive the lubricating oil under
2) Remove drain screw
. The lubrication oil is drained.
3) After the drain, wipe out the oil and attach the drain
screw 1. 3.Inspectingandreplacingtheoillter Normal lubrication cannot be performed if dust collects inoillter
1. Inspect it every 6 months.
1)Removeoilltercap ,anddrawoutoillter 1 to inspect it. 2)Whenoillter is clogged with dust, replace it with a new one.
3) After the replacement, fix the filter cap
with screws 3. Whenremovingtheoilltercap,lubricating oilcollectedinthelterwillleakout.So,be careful.WARNING : Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthefol- lowingworkafterturningthepoweroffandascertainingthatthemotorisatrest.
1) To adjust the height of the presser foot, adjust the
so that the presser foot does not comeincontactwithothercomponentsandxthe presser foot with nut
2) Adjust the position of the thrust collar so that the
clearance between thrust collar
and presser bar bushing
is 0.1 mm when the presser foot is lifted. Thenxthethrustcollarwithsetscrew
is turned counterclockwise, micro-lifter stopper
lowers and comes in contact with presser lifting lever
. Then the presser foot goes up. Adjust the height in accordance with the sewing conditions. Whenthemicro-lifterisnotused,turn clockwisemicro-lifterknob andxmicro- lifterstopper atthehighestposition.
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