PS700 - Sewing machine JUKI - Free user manual and instructions

USER MANUAL PS700 JUKI

series before putting the machine into service when this device is installed to the MO-6000

series. In addition, assemble and set up the device referring not only to this Instruction Manual but also to the Parts Sheet and the Instruction Manual for the SC-921 (or SC-510). ENGLISHENGLISH CONTENS !. PREFACE .................................................................................................. 1

6. Change-over of the chain-off thread rolling-in and the runstitching (Sensor blind)...... 43

. SETTING OF THE CONTROLLER (SC-921) This Instruction Manual only describes the functions related to the LB-6.For the details of other functions and the adjustment, refer to the Instruction Manual for the SC-921.

1. Setting of the machine model

(1) Selecting the machine head type Set the machine head type to MO.1 or MO.2.The MO.1 and the MO.2 differ only in the setting sewing speed. Take care not to exceed the maximumsewing speed of the sewing machine you use.Machine head type Maximum sewing speed Sewing speed to be employed immediately after the sewingmachine model settingMO.1 5500 4000MO.2 8000 70001. When using the sewing machine for the first time after you purchased, first, performsetting of the machine model.The direction of rotation and the maximum sewing speed are determined by the setting ofthe sewing machine model. If the setting is mistaken, a trouble will be caused. So, becareful.2. Various settings such as number of stitches to be sewn with tension released for start,number of stitches of slow start, etc. are performed after setting the machine model.3. When the setting of the machine model is performed after the various settings describedin the aforementioned item 2, all contents which have been set in the item 2 disappear andthe controller returns to the status before performing setting.In this case, re-setting is necessary. So, be careful.For the sewing machine which has been delivered after set-up, the machine model andother items have been already set. Do not perform the setting of the machine model.

. PREFACE Chain-off thread presser plate Counter knifeWARNING :The counter knife is installed under the chain-off thread presser plate. When removing or shifting thechain-off thread presser plate, the counter knife is exposed. Fingers or the like may be cut with thecounter knife. So, be careful.Chain-off thread presser plateCounter knifeWhen machine model setting is performed, MO.1 is set to 4,000 sti/min and MO.2 to 7,000 sti/min. Refer to"@-4. Various settings of the chain-off thread rolling-in sewing" and "@-5. Changing procedure ofthe various settings" for how to change the sewing speed.2 How to change over to the function setting mode

1) Turn OFF the power to the unit.

switch 5, turn ON the power to the unit.

3) The display on the screen is as shown in the fig-

ure. (If the indication fails to change, re-perform the procedures 1) and 2). Do not perform switch operations other than those described in the following explanations.Be sure to re-turn the power switch ON after one second or more has passed. If the power isturned ON immediately after turning it OFF, the sewing machine may not work normally. Inthis case, turn ON the power again. Switch for entering specified value changedand updating setting No. in DOWN direction Switch for entering specified value changedand updating setting No. in UP direction Down switch (DOWN) Up switch (UP) Mode changeover switch (2) Selecting procedure of the machine head type

Specified No.Specified valueIf you have already set other items, thelast number and the data you have set aredisplayed.3 ENGLISH

4) Press switch 1 or switch 2 to call the

display as shown in the figure (No. 95).

5) The type of machine head can be selected by

pressing switch 3 ( switch 4). The MO.1 and the MO.2 differ only in the setting range of the maximum sewing speed.

6) After selecting the type of machine head, by

pressing switch 1 ( switch 2), the step proceeds to 96 or 94, and the display automati- cally changes to the contents of the setting cor- responding with the type of machine head. Turn OFF the power.

When the machine head type is changed, the contents which have been changed before return to the standard set values. When the power is turned OFF without performing the determining operation, the setting is not changed. So, be careful.4

2. Setting of the chain-off thread rolling-in function

Changeover to the function setting mode [Changeover to the service mode]

1) Turn OFF the power.

switch 5, turn ON the power.

3) The screen is displayed. Continue pressing

switch 5 for three seconds.

4) When the second buzzer beeps, the changeover

to the service mode is completed. The display of the screen is as shown in the figure. (Same as the users' mode)

5) Call the chain-off thread rolling-in function.

Press switch 1 or switch 2 to call the display as shown in the figure (No. 141)

If you have already set other items, thelast number and the data you have set aredisplayed.5 ENGLISH

switch 1. (Figure is the display after pressing switch 1.)

8) While "U1 0" is displayed, press

switch 2 to call up "U1 1". In this state, the number of stitches to be sewn with the thread tension released at the beginning of sewing can be set. Press switch 3 or switch 4 to change the setting. If you do not need to change the setting, proceed to step 10).

ber of stitches to be sewing from the point at which the material sensor detects the material edge at the end of sewing to the point from which the thread tension is released. Press switch 3

switch 4 to change the setting. If you do not need to change the setting, proceed to step 11).

switch 2 to call up "U1 3". The number of chain-off stitches can be set. Press switch 3 or switch 4 to change the set- ting. If you do not need to change the setting, proceed to step 12).

switch 2 to call up the display "FUn_ UT1_" again. Then, turn the power off. Now, the LB function settings are confirmed.

Do not omit steps 9) to 12) even if you do not need to change the settings of "U1 1" to "U1 3". If you omit these steps, the LB function settings are not confirmed.7 ENGLISH

1) Turn OFF the power.

switch 3, turn ON the power.

3) "FL on" is displayed. When "FL oFF" is displayed,

carry out steps 1) and 2) again.

4) The display can be changed over between "FL

on S" and "FL on A" by switch 4. Select "FL on A".

5) When the display of the screen becomes

, the auto-lifter function becomes effective. Turn OFF the power in the state.

Max sewing speed [sti/ min] MO.1 MO.2 Number of stitches of soft start [Stitch] Sewing speed for soft start [sti/min] MO.1 MO.2 Chain-off thread sewing speed at the end of sew- ing [sti/min] MO.1 MO.2 Number of stitches of thread tension release at the start of sewing [Stitch] Number of stitches from detection of material end sensor at the end of sew- ing to thread tension re- lease [Stitch] Number of stitches of chain-off thread sewing [Stitch]

4. Various settings of the chain-off thread rolling-in sewing

The respective functions are set to the standard commendable values by setting of 1 through 3. However, the values can be changed in accordance with the sewing conditions. The change can be performed with

. Typical setting item and set value as the chain-off thread rolling-in function are described in the list below. Setting item Standard value Setting range Change mode Program No. Remarks

150 to 5500 150 to 8000 0 to 19 100 to MAX. 150 to MAX 0 to 100 0 to 100 0 to 100 Users' mode Normal mode

U1 1 U1 2 U1 3 Max. value is that of No. 96. Max. value is that of No. 96. Refer to p.8. Refer to p.8. Length of chain- off thread is ad- justed.

• For other setting, refer to the Instruction Manual for SC-921 and the Engineer's Manual for SC-921.9 ENGLISH

1) Number of stitches to be sewn with tension re-

leased for start The number of stitches to be sewn with the thread tension released for the start of sewing can be changed. Chain-off thread can be neatly rolled in the seam at the start of sewing by releasing thethread tension for one or two stitches. 00 to 99 stitches 00 to 99 stitches The number of stitches to be sewn with the tension released is the number of stitches to be sewn after start-up of the sewing machine. It is not the number of stitches to be sewn with the tension re- leased for the actual sewing product. Be aware also that the tension releasing mechanism is incapable of starting in time depending on the settings of slow-start sewing speed and number of stitches. In such a case, the number of stitches to be sewn with the thread tension released may exceed the setting.

2) Number of stitches to be sewn with tension re-

leased for end The number of stitches to be sewn with tension released for the end of sewing is the number of stitches to sewn after the material end comes off the material end sensor. It is not the number of stitches to be sewn with the tension released as counted from the material end of the actual sewing prod- uct.10

5. Changing procedure of the various settings

-4. Various settings of the chain-off thread rolling-in sewing

, and check the change modeof the item to be changed.Changing procedure of the respective modes is as described below. (1) Changing procedure under the users' mode

1) Turn OFF the power.2) Pressing switch 5, turn ON the power.

3) Indication 6, 7 will be shown on the display. (If

the indication fails to change, re-perform the pro-cedures 1) and 2).The last number and the data you have set aredisplayed.4) When you want to advance the setting No., press switch 2 to advance the setting No.When you want to return the setting No., press switch 1 to return the setting No.When switch ( switch ) is heldpressing, the setting No. will return (willadvance) continuously. When the settingNo. is advanced (returned), the contentswhich are before by one (after by one) willbe determined. So, be careful when chang-ing the contents (up/down switch istouched).

to call up No. 37.Press switch

change the sewing speed.

5) When you have finished changing of the setting,

press switch 1 or switch 2 to confirm the value you have updated. After completing the operation, turn OFF the power and turn ON the power again to return to the normal.

1. When turning OFF the power before

performing this work, the contents which have been changed are not up- dated.

, and screen dis- play will change to the contents of the setting No. which is before by one.

, and screen dis- play will change to the contents of next setting No. After completing the opera- tion, turn OFF the power and turn ON the power again to return to the nor- mal operation.

The sewing machine does not operate atthe time of this display. (2) Changing procedure under the normal mode

1) Turn ON the power.

are displayed under the displays of A, B, C, and D.

2) Calling of the setting mode

Press switch 2. The display is changed over as shown in the fig- ure, and changed over to the display of the num- ber of stitches of each process (display C). Fur- ther press switch 2 and the display is changed over to U1 1 / U1 2 / U1 3.

switch 3 or switch 4 to change the set value between the range of 0 and 100.

4) Determination of the contents

Press switch 1. The changed contents can be determined by the switch operation, and the displayreturns to the normal display. When the power is turned OFF on the way, the contents cannot be updated. When the display returns to the normal display, the pedal opera- tion or the like becomes effective.

. SETTING OF THE CONTROLLER (SC-510) This Instruction Manual only describes the functions related to the LB-6.For the details of other functions and the adjustment, refer to the Instruction Manual for the SC-510.

1. Setting of the machine model

(1) Selecting the machine head type Set the machine head type to MO.1 or MO.2.The MO.1 and the MO.2 differ only in the setting sewing speed. Take care not to exceed the maximumsewing speed of the sewing machine you use.1. When using the sewing machine for the first time after you purchased, first, performsetting of the machine model.The direction of rotation and the maximum sewing speed are determined by the setting ofthe sewing machine model. If the setting is mistaken, a trouble will be caused. So, becareful.2. Various settings such as number of stitches to be sewn with tension released for start,number of stitches of slow start, etc. are performed after setting the machine model.3. When the setting of the machine model is performed after the various settings describedin the aforementioned item 2, all contents which have been set in the item 2 disappear andthe controller returns to the status before performing setting.In this case, re-setting is necessary. So, be careful.For the sewing machine which has been delivered after set-up, the machine model andother items have been already set. Do not perform the setting of the machine model.When machine model setting is performed, MO.1 is set to 4,000 sti/min and MO.2 to 7,000 sti/min. Refer to"#-4. Various settings of the chain-off thread rolling-in sewing" and "#-5. Changing procedure ofthe various settings" for how to change the sewing speed.Machine head type Maximum sewing speed Sewing speed to be employed immediately after the sewingmachine model settingMO.1 5500 4000MO.2 8000 700014 How to change over to the function setting mode [Changeover to the users' mode]

1) Turn OFF the power to the unit.

2) Pressing switch 4, turn ON the power to the unit.

3) Indication 5, 6 will be shown on the display. (If

the indication fails to change, re-perform the pro- cedures 1) and 2). Do not perform switch operations other than those described in the following explanations.Be sure to re-turn the power switch ON after one second or more has passed. If the power isturned ON immediately after turning it OFF, the sewing machine may not work normally. Inthis case, turn ON the power again.

4) Press switch 1 to display the figure (No. 95).

5) Press switch 3 or 4 to select the machine head

type (MO.1 or MO.2). The MO.1 and the MO.2 differ only in the setting range of the maximum sewing speed.

6) By pressing DETERMINE switch 1 or 2, No.

94 or No. 96 is displayed, and setting of machine head type is determined. Turn OFF the power. When the machine head type is changed, the contents which have been changed before return to the standard set values. When the power is turned OFF without performing the determining operation, the setting is not changed. So, be careful.16

2. Setting of the chain-off thread rolling-in function

Changeover to the function setting mode [Changeover to the service mode]

1) Turn OFF the power.

2) Pressing switch 4, turn ON the power.

3) The screen is displayed. Continue pressing

switch 4 for three seconds.

4) When the second buzzer beeps, the changeover

to the service mode is completed. The display of the screen is as shown in the figure. (Same as the users' mode)

5) Call the chain-off thread rolling-in function.

Press switch 1 or 2 to display the figure (No.65).17 ENGLISH

6) Press switch 3 or 4 to call the utility device 1.

(Display of FUn UT1_)

7) By pressing switch 1, the setting is determined.

(Figure is the display after pressing switch 1.)

9) By pressing switch 1, the setting is determined.

1) Turn OFF the power.

2) Pressing switch 3, turn ON the power.

3) When the display of the screen becomes

the auto-lifter function becomes effective. Turn OFF the power in the state.

• When the display of the screen appears as "FL oFF", perform again the operation of steps 1) through 3). The display changes to

ENGLISH Max sewing speed [sti/ min] MO.1 MO.2 Number of stitches of soft start [Stitch] Sewing speed for soft start [sti/min] MO.1 MO.2 Chain-off thread sewing speed at the end of sew- ing [sti/min] MO.1 MO.2 Number of stitches of thread tension release at the start of sewing [Stitch] Number of stitches from detection of material end sensor at the end of sew- ing to thread tension re- lease [Stitch] Number of stitches of chain-off thread sewing [Stitch]

4. Various settings of the chain-off thread rolling-in sewing

The respective functions are set to the standard commendable values by setting of 1 through 3. However, the values can be changed in accordance with the sewing conditions. The change can be performed with

. Typical setting item and set value as the chain-off thread rolling-in function are described in the list below. Setting item Standard value Setting range Change mode Program No. Remarks

150 to 5500 150 to 8000 0 to 9 100 to MAX. 150 to MAX 0 to 999 0 to 999 0 to 999 Users' mode Normal mode

U1.1 U1.2 U1.3 Max. value is that of No. 96. Max. value is that of No. 96. Refer to p.8. Refer to p.8. Length of chain- off thread is ad- justed.

• For other setting, refer to the Instruction Manual for SC-510 and the Engineer's Manual for SC-510.20

1) Number of stitches to be sewn with tension re-

leased for start The number of stitches to be sewn with the thread tension released for the start of sewing can be changed. Chain-off thread can be neatly rolled in the seam at the start of sewing by releasing thethread tension for one or two stitches. 00 to 99 stitches 00 to 99 stitches The number of stitches to be sewn with the tension released is the number of stitches to be sewn after start-up of the sewing machine. It is not the number of stitches to be sewn with the tension re- leased for the actual sewing product. Be aware also that the tension releasing mechanism is incapable of starting in time depending on the settings of slow-start sewing speed and number of stitches. In such a case, the number of stitches to be sewn with the thread tension released may exceed the setting.

2) Number of stitches to be sewn with tension re-

leased for end The number of stitches to be sewn with tension released for the end of sewing is the number of stitches to sewn after the material end comes off the material end sensor. It is not the number of stitches to be sewn with the tension released as counted from the material end of the actual sewing prod- uct.21 ENGLISH

5. Changing procedure of the various settings

-4. Various settings of the chain-off thread rolling-in sewing

, and check the change modeof the item to be changed.Changing procedure of the respective modes is as described below. (1) Changing procedure under the users' mode

1) Turn OFF the power.2) Pressing switch 4, turn ON the power.

3) Indication 5, 6 will be shown on the display. (If

the indication fails to change, re-perform the pro-cedures 1) and 2).4) When you want to advance the setting No., pressswitch 2 to advance the setting No.When you want to return the setting No., pressswitch 1 to return the setting No.When switch (switch ) is held press-ing, the setting No. will return (will ad-vance) continuously. When the setting No.is advanced (returned), the contentswhich are before by one (after by one) willbe determined. So, be careful when chang-ing the contents (up/down switch istouched).Setting NO.22 Example) Change of the number of revolution of soft start Press switch 1 or 2 to call No. 37. Press switch 3 or 4 to change the num- ber of revolution.

5) When the change has been completed, press

switch 1 or 2 to specify the changed value. After completing the operation, turn OFF the power and turn ON the power again to return to the normal.

1. When turning OFF the power before

performing this work, the contents which have been changed are not up- dated.

, and screen display will change to the contents of the setting No. which is before by one.

, and screen display will change to the contents of next setting No. After completing the operation, turn OFF the power and turn ON the power again to return to the normal op- eration.

ENGLISH The sewing machine does not operate atthe time of this display.

(2) Changing procedure under the normal mode

1) Turn ON the power.

are displayed under the displays of A, B, C, and D.

2) Calling of the setting mode

Press switch 2. The display is changed over as shown in the fig- ure, and changed over to the display of the num- ber of stitches of each process (display C). Fur- ther press switch 2 and the display is changed over to U1.1 / U1.2 / U1.3.

3) Change of the set value

Press switch 3 or 4 to change the set value between 0 to 999.

4) Determination of the contents

Press switch 1. The changed contents can be determined by the switch operation, and the dis- play returns to the normal display. When the power is turned OFF on the way, the contents cannot be updated. When the display returns to the normal display, the pedal opera- tion or the like becomes effective.24

1) Attach mounting base 2 ,gauge 3 , and joints

4 and 5 to air regulator 1.

2) Drill two holes of ø4.6 in the side strut of the stand,

and install air regulator 1 using tapping screws

When assembling the pneumatic components, it is effective to prevent air leak by winding the seal tape onthe screw portion of the joint or the like.

1. Installing the air regulator

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off. ø4.6 OUT

ENGLISH (1) Presser lifter solenoid valve

1) Attach mounting base 2 to solenoid valve 1 with

2) ø6 Attach joint 3 and silencer 4.

2. Installing the solenoid valve

(2) Thread tension release solenoid valve Attach mounting base 6 to solenoid valve 5 with screws 7. WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.

(3) Intermediate latch drive solenoid valve Attach mounting base 2 to solenoid valve 1 with screws 3.

2-pinconnector Remove once the thread tension attached to the sewing machine and install the thread tension total asm.on the upper cover.

1. Installing the thread tension total asm. (thread release unit)

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off. (4) Installing the various solenoid valves on the machine table Fix the solenoid valves near the side of the motor lo-cated on the rear face of the table with wood screws1. SC-510Presser liftingsolenoid valveTension releasesolenoid valveIntermediate latch drivesolenoid valve27 ENGLISH

2. Installing the presser lifting unit

(1) Installing the presser lifting cylinder

1) Attach roller 2 and pin 3 to cylinder knuckle 1

and fix pin 3 with two C rings.

(2) Installing components to the machine head

1) Fix presser lifting cylinder mounting base 6 in

thecenter of the slot with screws 7.

2) Screw in cylinder knuckle 1 to the top end of the

3) The position of cylinder knuckle 1 is adjusted

after installing the cylinder on the machine head. So, place it in an appropriate position. Do not fix lock nut 4 here.

4) Assemble presser lifting cylinder couple 5.

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.

2) Install the cylinder to cylinder mounting base 6

with screws 8. At this time, assemble presser lifting lever 9 so that it fits in the forked portion of cylinder knuckle

(3) Adjusting the presser lifting unit

1) Adjust the position of cylinder knuckle 1.

Adjust the position so that there is a play in the lower direction of the presser lifting lever when theair cylinder shrinks and the lift amount of presser foot is secured when the air cylinder stretches.

2) When the position is determined, fix cylinder

knuckle 1 with lock nut 4.

3) When it is not possible to adjust the unit by means

of the position of cylinder knuckle 1only, loosen screw 7 and move presser lifting cylinder mount- ing base 6 within the range of the slot to adjust the unit.

Presser lifting lever

ENGLISH (1) Additional machining of the table When you use a table other than JUKI Part No.11959707, drill a hole 1 for clamping cords. (2) Place the machine head on the frame support plate and put the belt in posi tion. Adjust the belt tension referring to the InstructionManual for the SC-921 (or SC-510).(When the sewing machine is operated and the de-flection of the belt is excessive, check again the belttension.)

1. Installing the machine head

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off. (3) Attach earth cord

1) Sewing machine sideEarth mark is attached in the rear side of thesewing machine. Attach the earth cord to thescrew hole in the order of toothed lock washer

earth cord 2 and setscrew 3.2) Power switch box sideConnect the terminal located on the opposite sideof the earth cord attached to the machine headto the earth of the power switch box.Pass the earth cord through the place where itdoes not come in contact with the sewing ma-chine belt.Open the cover of the power switch and connectthe earth cord to the earth on the secondary side.EarthPower switchPerform the work with the power recep-tacle removed. (30) ø36

Table30 Bore a hole in the belt cover through which a cord is to be passed.Cut this section with a pair of pliers or the like.(If the section has burrs, shave them off.)Pass the sensor cord through the hole.• Attach the belt cover to the table and put the belt in position. Then, putthe belt cover onto the belt. (1) Adjusting procedure with the built-in synchronizer [Needle-up position]1) Turn the handwheel by hand to bring the needle bar to its lower dead point position.2) Keep the hands off the sewing machine and turn ON the power in the state that it is safe even when thesewing machine starts.The sewing machine stops after about a half rotation. This position is the up-stop position of the sewingmachine.3) Adjust the position so that the up-stop position is in the left travel end of the upper looper.[Needle-down position] The standard position of DOWN stop position is the state that the guide section is adjusted to the movable section. [Adjusting procedure]

1 or 2 and turn the movable section clockwise to advance the stop position. After the adjustment, securely tighten the setscrews. (Setscrews 1 : for UP stop position, setscrews 2 : for DOWN stop position)

3) When the adjustment is completed, attach the hand pulley and the belt cover.

Perform the work with the power OFF except when checking the stop position.

2. Adjusting the synchronizer

For adjusting the needle-up stop positionFor adjusting the needle-down stop positionGuideMovable componentGuideMovable componentStop positionRetardsRetardsAdvancesAdvances (For UP stop position)(For DOWN stop position)

(2) Installing the belt cover31 ENGLISH (1) Air piping drawing Perform the piping while referring to the piping drawing below.

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.Rotary air cylinder

=1 m Intermediate latch drivesolenoid valve

=1 m Thread tension releasesolenoid valve

=0.8 mAdjustment knobPresser lifter solenoid valveAir regulator

=0.4 m32 (2) Binding the air tubes and cords Bind the air tubes and cords with the spiral tubes and cable clip bands so that they do not interfere with the moving parts such as V belt, motor, presser lifting lever, etc. (3) Connecting the air source

1) Connect the air source with the adjustment knob of the air regulator with loosened.

2) Adjusting the air regulator

Set the pressure to 0.5 MPa. Tighten the adjustment knob of the air regulator to adjust the pressure. Setting of the air pressure is excessive, damage will be given to the air cylinder or the like.

3) Confirming the air piping

1 Confirm the piping with the power OFF. 2 Confirm that thread tension release plate 1 fits in the upper thread tension disks. 3 Confirm that the intermediate latch recedes in the throat plate. If the reverse state of the description in the Instruction Manual occurs, expel the air once and change the connection of the air tube.

4. Connecting to the connector of the SC-921

• To prevent personal injury caused by abrupt start of the sewing machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.

• To prevent damage of device caused by maloperation and wrong specifications, be sure to connect all the corresponding connectors to the specified places.

• To prevent personal injury caused by maloperation, be sure to lock the connector with lock.

• Three kinds of relay cords (connector change cord) are used. 1 CN30 : Connect motor signal connector.2 CN33 : Connect synchronizer.3 CN36 : Connect intermediate latch and thread tension release solenoid valves.4 CN37 : Connect presser lifter solenoid valve.6 CN54 : Connect material end sensor.7 CN39 : Connect when using foot pedal for standing work (PK-70 or the like).Relay cord Loosen fixing screw A in the under-cover of the SC-921. Then, open the cover to find the following connectors. Connect the machine head connector to the relevant location.

5. Connecting to the connector of the SC-510

• To prevent personal injury caused by abrupt start of the sewing machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.

• To prevent damage of device caused by maloperation and wrong specifications, be sure to connect all the corresponding connectors to the specified places.

• To prevent personal injury caused by maloperation, be sure to lock the connector with lock.

• Two kinds of relay cords (connector change cord) are used. When front cover fixing screws A of SC-510 are loosened and the cover is opened, the connectors described below are prepared. Connect the machine head connectors to the corresponding positions. 1 CN30 : Connect motor signal connector.2 CN33 : Connect synchronizer.3 CN36 : Connect intermediate latch and thread tension release solenoid valves.4 CN37 : Connect presser lifter solenoid valve.5 W4 : Jumper pin for material end sensor input/output power changeover (Change to +12V. Refer to the next page.) 6 CN51 : Connect material end sensor.7 CN39 : Connect when using foot pedal for standing work (PK-70 or the like).

Relay cord Front cover35 ENGLISH

The material end sensor does not oper-ate properly unless this setting is per-formed. Change the jumper pin for material end sensor from +5V to +12V. (+5V has been set at the time of delivery from the factory.) (1) Installing the components

1) Install luminescence sensor 1 with screws 2 so

that it is in parallel to the cloth plate.

2) Fix the sensor cord 3 with cord clamp 5 so that it

is not caught with presser lifting lever 4.

6. Installing the material end sensor

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.

(2) Connection to the control box

1) Pass the cord of luminescence sensor to the round hole of the table located in the rear side of the sewing

machine. For connecting to the SC-921, refer to

-4. Connecting to the connector of the SC-921”

For connecting to the SC-510, refer to

-5. Connecting to the connector of the SC-510”

WARNING :Do not depress the starting pedal since there is the danger of abrupt rotation of the sewing machine.To avoid the maloperation, it is recommended to perform the work without putting the V belt.

1) Pasting the reflection label

Wipe out dirt or oil from the top surface of the pasting portion beforehand.

2) Pasting position of the reflection label :

(Longitudal direction) Paste the seal making the upper knife as refer ence. (Lateral direction) Turn ON the power to the sewing machine and paste it in the position where the red light of the luminescence sensor is irradiated.

3) When the irradiation position of the red light of the

luminescence sensor does not match the position of the reflection label which has been pasted in the longitudinal direction, adjust the installing po sition of the material end sensor asm. Blind “open”Irradiationlight fromluminescencesensorReflection tape Position ofupper knife atthe time ofup-stoppositionPerform the work with the sensor blind“open”. (3) Pasting the reflection label37 ENGLISH (4) Adjusting the sensitivity of the luminescence sensor

Do not depress the starting pedal since there is the danger of abrupt rotation of the sewing machine. To avoid the maloperation, it is recommended to perform the work without putting the V belt.

2) State with material on the sensor

Place the material to be sewn on the sensor mounted on the cloth plate. Turn the variable re sistor for the sensitivity adjustment from point A gradually toward the direction in which the sensi tivity is increased until the stable indicator lamp (green LED) goes out. This position is designated as point B.

1) Adjust the sensitivity with the variable resistor for

the sensitivity adjustment of the luminescence sen sor as described below. Without material : Green and red light up. With material : Green lights up and red goes off.

• Sensor blind is in the state of "open" as shown in the figure on the left.

2) Adjust the sensitivity of the luminescence sensor

in accordance with the material to be sewn. Max. Point

[Adjusting procedure]

1) State without material on the sensor

Turn the variable resistor for the sensitivity adjust ment from the maximum position gradually toward the direction in which the sensitivity is decreased until the stable indicator lamp (green LED) goes out. This position is designated as point A. Material Point

ment to the middle of points A and B.

Confirm the followings : When material is not placed on the sensor : Green and red light up. When material is placed on the sensor : Green lights up and red goes out. The sensitivity adjustment of the material end sen sor has been completed. Variable resistor for sensitivity Luminescence sensor Green/red LED Sensor blind38 Check the following items so as to avoid malfunction/damage of/to the machine.

• Clean up the machine before putting the machine into service for the first time after the set-up.

• Remove dust accumulated on the machine during transportation and lubricate it.

• Check to be sure that the voltage is set to a correct value.

• Check to be sure that the power plug is properly connected.

• Never use the machine with any voltage specification different from the correct one.

. OPERATING PROCEDURE

• Refer to the standard instruction manuals for the respective models of machines for lubrication, installa-tion of the needle, adjustment of presser foot pressure, removing the presser foot, adjustment of stitchlength, adjustment of differential feed, adjustment of knife and overedging width, cleaning of the machinehead, and cleaning and replacement of filter and pump net.Thread the machine head as illustrated.(A threading diagram is adhered also in therear side of the looper cover.)

1. Passing the thread

WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.39 ENGLISH

WARNING :To prevent possible injury caused by abrupt start of the machine, be sure to keep hands, hair and clothesaway from the rotating parts and needle entry area. When the power switch is turned on, the sewing machine will actuate to make a half to one revolution to detect the highest dead point of the machine. If you place hands, hair and clothes near the rotating parts or the needle entry area, a stab or injury resulting from being involved/caught in the aforementioned parts/area can result.

Depressing the front part of pedal--- Sewing machine runs. Pedal is in its neutral position.--- Sewing machine stops. Depressing the back part of pedal--- Presser foot goes up. (Presser foot comes down.) Fully depressing the back part of pedal--- Initialization of the operation of presser liftingand chain-off thread rolling-in.(Use at the start of sewing only. Do not perform thisoperation during sewing.) Fully depressing the back part of the pedal of

initializes the chain-off thread rolling-in operation. Accordingly, if the operation of 4 has been performed during sewing, “thread tension re- lease at the start of sewing” is actuated when starting sewing again. Do not perform the operation of during sewing.

3. Chain-off thread rolling-in sewing

(1) Confirmation of the display of the SC- 921 (or SC-510) Check to be sure that "----" is displayed on the screen when you turn on the power to SC. If not, re-check the setting of the SC-921 (or SC-510). SC-921SC-51040 (4) End of sewing 1) The chain-off thread sewing automatically starts when the material end comes off the sensor.When the sewing machine has sewn the specified number of stitches of chain-off thread sewing, thesewing machine stops and the presser foot goes up.2) For the setting of the (automatic) chain-off thread sewing speed and the number of stitches at the end ofsewing, refer to "@ -4. Various settings of the chain-off thread rolling-in sewing" and "

-5. Chang- ing procedure of the various settings " in the case of the SC-921 or to "# -4. Various settings of the chain-off thread rolling-in sewing " and "# -5. Changing procedure of the various settings " in thecase of the SC-510. (2) Setting the material and confirming the material end sensor

1) Depress the back part of the starting pedal to lift

the needle and presser foot.

2) Push the material to be sewn under the upper knife

as far as it will go to set the material. At this time, Confirm that the display of the lumi nescence sensor is : With material : Green and red light up. Without material : Green lights up and red goes out.

• Sensor blind is in the state of "open" as shown in thefigure on the left side. When the starting pedal is de-tached, the presser foot comes down.

3) When the display of the luminescence sensor is

(4) Adjusting the sensitivity of the lumines cence sensor”

Reflection seal ofmaterial end sensorMaterial (3) Starting Depress the front part of the starting pedal, and the machine will start.1. If the material does not reach the sensor, the sewing machine will not start even if youdepress the starting pedal. It is therefore necessary to place the material in thepredeterminded position without fail.2. To lift the presser foot during sewing, depress the back part of the starting pedal.(Do not fully depress the back part of pedal.)The sewing machine does not stop even if you release the starting pedal during the auto-matic chain-off thread sewing.Turn OFF the power in case of emergency.Variable resistor forsensitivityLuminescencesensorGreen/red LEDSensor blindSensor blind41 ENGLISH (5) Cutting away chain-off thread from the material 1 Lightly pull chain-off thread produced at the end of sewing away from you. (To such an extent that the chain-off thread comes off the latch of the throat plate) 2 Route the chain-off thread so that it is not caught by the feed dog. 3 Place the chain-off thread under the chain-off thread pressing plate.

• Pull the chain-off thread toward you, and place the chain-off thread in the state of being stretched. 4 When the chain-off thread is placed further to the right direction after it has entered the groove of throat plate, the counter knife cuts away the chain-off thread from the material.

4. Adjusting the sewing

Adjust so that looper thread and needle thread in-terlace by the same length. (Chain-off thread that slightly returns to the previ-ous length when it is drawn then released.)Tighten the protruding thread.If this type of chain-off thread is produced, the needlethread may sew the chain-off thread resulting inimproper rolling-in of the chain-off thread.

(1) Stitches The thread tension controllers to adjust stitches are the ones on the lower stage of the two stages of the thread tension controllers. The thread tension controllers on the upper stage are used for the chain-off thread sewing. Upper stage : For chain-off thread sewing Lower stage : For stitches Adjust the controllers so tat the desired stitches can be obtained. (2) Chain-off thread The most desired state of the chain-off thread is soft-chains. Adjust the thread with the thread tension controllers on the upper stage.42

5. Adjusting the chain-off thread rolling-in device

(1) Adjusting the pressure of the chain-off thread presser spring Perform the adjustment with chain-off thread pres- sure adjusting screw 1. 1 Adjust the pressure of the spring to such an extent that the material end at the start of sew- ing is slightly rolled downward as shown in the figure 1. 2 Decrease the pressure of the spring when the material end at the start of sewing is excessively rolled downward. 3 Increase the pressure of the spring when the chain-off thread at the start of sewing does not enter the stitches and protrudes outward.

6. Change-over of the chain-off thread rolling-in and the runstitching

(Sensor blind) By opening/closing the blind of the material end sensor, the sewing machine can be used either for the chain-off thread rolling-in or for the runstitching. Opening/closing the blind is of rotary type.

The sewing machine can be used for the runstitching. (Regardless of the material, the machine starts.)

The sewing machine can be used for the chain-off thread rolling-in. (When the material is not placed on the sensor, the machine does not start even when depressing the front part of the starting pedal.) In case of closing the blind of the material end sensor (runstitching), thread tension release at the start of sewing and soft start operate at the time of the first sewing after turning ON the power and sewing after fully depressing the back part of the starting pedal. It is possible to avoid the operation by setting the number of stitches of thread tension release at the start of sewing and the number of stitches of soft start to “0”. Sensor blindSensor blind44

Setscrew Chain-off threadpresser plateCounterknife0 to 1 mmCounter knifeshould notprotrude fromthe end face.WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.The reflection label is always in touch with the sewing product. This causes the surface of the label to wearto impair the reflection performance of the label. If the label has worn out, it has to be replaced with a newone. In the case where the label loses the reflection performance, the sewing machine can operate with nomaterial placed on the machine at the start of sewing or cannot produce soft-chain type chain-off thread. Inthis case, the chain-off thread rolling-in function will fail to work. If the reflection performance of the labelcannot be resumed by adjusting the sensor, be sure to remove the worn-out label and adhere a new one onthe cloth plate.1) Peel off the reflection label from the cloth plate.2) Degrease the surface of the cloth plate on which the label has been adhered and adhere a new labelthere.After the reflection label is replaced, adjust the sensor sensitivity. See

-6-(4). Adjusting the sensitivity of the luminescence sensor” for the adjusting procedure of the sensor sensitivity.When attaching the counter knife, attach the counter knife so that it comes in contact with thebottom face. If the chain-off thread presser rises, retaining of the chain-off thread cannot beperformed well.When the sharpness of the counter knife to cut the chain-off thread has been deteriorated, replace thecounter knife.Perform the work with care so that your finger or the like is not cut with the counter knife when replacing theknife.1) Hold up and turn the chain-off thread presser plate 1 to see the counter knife.2) Loosen the setscrews 2 and replace the counter knife.WARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off.

2. Replacing the counter knife

Chain-off thread presser plate Counter knife45 ENGLISH Stopper B (For backward)Needle entryportionChain-off threadguide plate Stopper A setscrew

Cover Intermediatelatch drive arm

Stopper A(For forward)

3. Adjusting the intermediate latch

Actuate stopper B 3 at the position where the top end of intermediate latch recedes 0 to 1 mm from the throat plate. After the adjustment, fix stopper B 3 with nut

(The work can be performed with ease when adjust- ing with stopper B 3 so that the top end of intermedi- ate latch is flush with the throat plate, then loosen the stopper B by 1/2 to 3/4 turn.) Needle entry portion0 to 1 mmWARNING :To protect against personal injury due to abrupt start of the machine, conduct maintenance works withthe power turned off. (1) Adjusting protruding amount of the intermediate latch Actuate stopper A 1 at the position where the intermediate latch protrudes 6 to 7 mm from the throat plate. At this time, assemble stopper A with setscrews 2 so that it comes in contact with the plane. (The work can be performed with ease when adjusting the protruding amount to 6 to 7 mm with stopper B 3, then make stopper A 1 come in contact with the plane.) Excessive protruding of the intermediate latch will be the cause of needle breakage. So, be careful. (2) Adjusting receding position of the intermediate latch Excessive receding of the intermediate latch will deteriorate the movement. So, be careful. (3) Attaching the cover Lightly press cover 6 in the direction of the arrow mark, make it come in contact with chain-off guide plate 5 and fix it with setscrews 7. 6 to 7 mm46

1. When the chain-off thread is not neatly rolled in :

1 Making the state of soft-chains of the chain-off thread p412 Increasing the pressure of chain-off thread presser spring p.423 Increasing the number of stitches to be sewn with tension released for start p.8 , 124 Decrease the slow-start sewing speed. p.8 , 105 Increasing the number of stitches of the slow start p.8 , 10

2. When the needle thread tension is released at the start of sewing

1 Decreasing the number of stitches to be sewn with tension released p.8 , 122 Decrease the slow-start sewing speed. p.8 , 103 Increasing the number of stitches of the slow start p.8 , 10 Other items to be checked : 1 The mode is set to the chain-off rolling-in mode ? p.8 to 122 Slow start is set ? p.8 to 123 Chain-off presser plate is rising ? p.444 Thread tension plate normally works without friction ? p.26 , 325 Material to be sewn is pushed under the upper knife as far as it will go ? p.35Items to correspond to the trouble Ref. page

CHAIN-OFF THREAD ROLLING-IN SEWING

Chain-off thread can be neatly rolled in the seam at the start of sewing by releasing thethread tension for one or two stitches.

1. In the case of using the SC-92147

1. When the chain-off thread is not neatly rolled in :

1 Making the state of soft-chains of the chain-off thread p.41 2 Increasing the pressure of chain-off thread presser spring p.42 3 Increasing the number of stitches to be sewn with tension released for start p.19 , 23 4 Decrease the slow-start sewing speed. p.19 , 21 5 Increasing the number of stitches of the slow start p.19 , 21

2. When the needle thread tension is released at the start of sewing

1 Decreasing the number of stitches to be sewn with tension released p.19 , 23 2 Decrease the slow-start sewing speed. p.19 , 21 3 Increasing the number of stitches of the slow start p.19 , 21 Other items to be checked : 1 The mode is set to the chain-off rolling-in mode ? p.19 to 23 2 Slow start is set ? p.19 to 23 3 Chain-off presser plate is rising ? p.44 4 Thread tension plate normally works without friction ? p.26 , 32 5 Material to be sewn is pushed under the upper knife as far as it will go ? p.35 Items to correspond to the trouble Ref. page Chain-off thread can be neatly rolled in the seam at the start of sewing by releasing the thread tension for one or two stitches.

2. In the case of using the SC-51048DEUTSCH

Presser lifting lever

5. Adjusting the chain-off thread rolling-in device

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