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JUKI MF-7700 Series Engineer'S Manual Download Page 9

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6

 

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1. When motion of thread is very rough, and stable seams can not be

obtained, there are cases where the condition can be improved by

the following threading.

(1) Wind thread around 1st thread guide 

6

.

(2) Wind thread around the thread tension thread guide 

!0

.

2. When using more stretchable thread (wooly thread or the like), the

threading as given below does not make thread stretch and neat

seams can be obtained.

(1) Do not pass thread through spreader auxiliary thread tension 

4

.

(2) Do not pass thread through the looper thread tension disk.

Refer to section 

E

.

(Caution)

Even when using wooly thread or the like, seams are more

stabilized by passing thread through looper thread

auxiliary thread tension 

7

.

™

When threading is not properly

performed, not only sewing trouble

occurs, but also needle breakage is

caused. So, be careful.

Engraved marker line

7

Do not pass thread.

4

Standard Adjustment

Results of lmproper Adjustment

6

!0

Summary of Contents for MF-7700 Series

Page 1: ...R ENGINEER S MANUAL 13371604 No E361 01 High speed Flat bed Coverstitch Machine MF 7700 Series ...

Page 2: ...s advisable to use the relevant Instruction Manual and Parts List together with this Engineer s Manual when carrying out the maintenance of these machines In addition for the motor for the sewing machine with thread trimmer refer to the separate Instruction Manual or Engineer s Manual for the motor And for the control panel refer to the Instruction Manual for the control panel This manual gives th...

Page 3: ...justing the timing relation between the looper and needle bar 19 8 Retuming amount of the looper 21 9 Height of the needle 23 10 Locus and longitudinal motion of the looper 25 11 Adjusting the needle guard 27 12 Instlling cover of the looper and needle guard after adjusting 31 13 Adjusting the feed dog 33 14 Adjusting the feed relation 39 15 Adjusting the presser foot 41 16 Adjusting the micro lif...

Page 4: ...stroke 31mm standard possible up to 33 mm by adjustment 11 Dimensions Height 451 x Width 515 x Length 265 12 Weight 46kg 13 Lift of presser foot 8 mm needle gauge 5 6 mm without top covering and 5 mm with top covering Micro lifter mechanism is provided 14 Feed adjustment method Main feed dial type stitch pitch adjustment method Differential feed lever adjustment method micro adjustment mechanism i...

Page 5: ...ke up 4 Oil hole cap 3 Eye guard cover 2 Front cover 5 Micro lifter 4 Throat plate 3 Slide cover 6 Oil indication 5 Needle tip silicon oil lubricating unit 4 Needle bar thread take up thread 7 Needle thread silicon 6 Differential lock nut receiver oil lubricating unit 7 Micro adjustment knob 5 Rocking thread take up thread guide 8 Thread guide No 1 8 Finger guard 6 Silicon container thread guide 9...

Page 6: ...0 For collarette Collarette 10 Tongue shape of throat plate B B type Standard Availabilty 11 12 Needle gauge For 2 needle For 3 needle U10 C10 40 4 0mm Avail Avail 48 4 8mm Avail Avail Avail 56 5 6mm Avail Avail Avail Avail 64 6 4mm Avail Avail Avail Avail 14 22 Device and attachment blank Not provided 24 Destination A Standard 25 Accessory A Standard When device or attachment is one delete slash ...

Page 7: ...he commercially available motor pulley near to the counted value is designated since the outside diameter of the commercially available motor pulley counts by 5 mm 3 When you use a new sewing machine use the machine at a speed of 5 000 rpm or less for the first 200 hours approximately one month A good result can be obtained in terms of the durability Caution 1 Use a motor pulley which is adaptable...

Page 8: ...ad is used A Standard Adjustment 1 Threading the machine head 2 Threading for soft seams 1 Do not pass needle thread through needle bar thread take up 8 2 When soft seams are required change the threading of needle thread and slide the position of looper thread cam eyelet 3 Do not pass needle thread through needle bar thread take up 8 Pass the thread from rocking thread take up 9 to rocking thread...

Page 9: ...ake thread stretch and neat seams can be obtained 1 Do not pass thread through spreader auxiliary thread tension 4 2 Do not pass thread through the looper thread tension disk Refer to section E Caution Even when using wooly thread or the like seams are more stabilized by passing thread through looper thread auxiliary thread tension 7 When threading is not properly performed not only sewing trouble...

Page 10: ...tion as well when the needle bar is in its lowest position Timing of rocking thread take up 2 is performed by adjusting the position of rocking thread take up ball arm 8 4 Relation between the timing of rocking thread take up and the needle thread loop 1 When using the excessively stretchable thread or the hard to stretch thread the size of needle thread loop can be changed by by changing the timi...

Page 11: ...cking thread take up ball arm 8 to and fro 1 Standard adjustment figure is the position where the rear end anti operator s side of rocking thread take up ball arm 8aligns with engraved marker line 0 on rocking thread take up shaft 3 As the standard at this time note that the clearance provided between the rear end of rocking thread take up ball arm 8 and thrust collar 1 is 4 mm Caution 1 When loos...

Page 12: ...position of needle thread guide base and silicon container thread guide 1 It is the standard that the height of silicon containder thread guide 4 refer to 2 CONFIGURATION OF THE MACHINE COMPONENTS is the position where the height from the center of setscrew 5 to the bottom end of thread hole is 9 mm 2 Move the lateral position of needle thread guide base 2 fully to the right of slot 43 mm Extreme ...

Page 13: ...is not applied to threads 2 Adjusting the position of needle thread guide base and silicon container thread guide 1 Loosen setscrews 5 and 6 and move silicon container thread guide 4 up or down to adjust the height 2 Loosen setscrew 7 and adjust the lateral position of needle thread guide base 2 When needle thread guide rod 1 is raised needle thread is loosened When needle thread guide rod 1 is lo...

Page 14: ...d take up thread receiver 1 when the needle bar is in its lowest position 1 Position of the rocking thread take up thread receiver in case of soft seams In case thread is not passed through needle bar thread take up 2 1 It is the standard that the height of rocking thread take up receiver 7 is in the position where the top surface of rocking thread take up receiver 7 is in the range of the center ...

Page 15: ... height of right needle thread receiver 4 with setscrew 5 1 Loosen setscrew 0 and move rocking thread take up receiver 7 up or down to adjust the height 2 When desired to make rocking thread take up receiver 7 work especially on the right needle where loop is hard to be made adjust the height of the right needle thread receiver 6 with screw 1 When the needle bar thread take up thread receiver 1 is...

Page 16: ... thread take up 1 when spreader thread take up 1 is in its highest position Adjust the relation of the position so that thread is moderately stretched when spreader thread take up 1 is in its highest position in accordance with thread used or conditions 2 Standard position of the spreader auxiliary thread tension Standard adjustment figure of the spreader auxiliary thread tension is the standard w...

Page 17: ...er thread take up 1 adjust so that 95 length of rocking thread take up 9 95mm does not change Standard Adjustment Results of lmproper Adjustment When the relation of position between spreader thread take up 1 and the spreader thread guide is not proper sewing troubles such as stitch skipping and the like will be caused If thread is less stretched and slackness of thread occurs at the thread take u...

Page 18: ...dle is 0 1 to 0 3 mm 3 Protruding amount It is the standard that the dimension from the center of left needle to top end A of thread hooking section when spreader 1 is in the extreme left position is 4 5 to 5 5 mm 4 Spreader stroke It is the standard that the spreader stroke is 16 to 18 mm at the stroke of thread hooking section 5 Timing of the spreader Standard position is the position where the ...

Page 19: ...n where notch 0 in the main shaft aligns with notch 1 in spreader eccentric cam When changing turn the upper pulley and change with spreader eccentric cam 8 fixed Height of the spreader is improper stitch skipping of spreader occurs Adjust the height in accordance with the needle gauge Even when the protruding amount is excessive or insufficient stitch skipping of spreader will be caused When the ...

Page 20: ...tandard that the clearance provided between spreader thread guide 2 and needle clamp thread guide 3 is 0 8 to 1 2 mm 3 Lateral position of the spreader thread guide Top end of thread hooking section D of the spreader aligns with center E of slot C in spreader thread guide 2 when spreader 1 is in the extreme right position 6 Adjusting the spreader 0 8 to 1 2 mm 0 4 to 1 0 mm 1 4 3 2 1 C E D 3 4 5 2...

Page 21: ...amp thread guide and spreader thread guide 2 to 0 8 to 1 2 mm 3 For the lateral direction align the hole of needle clamp thread guide 3 to the prolonged line of the slot of spreader thread guide Caution When adjusting spreader thread guide 2 in the lateral direction check whether there is any contact at section B left side of spreader thread guide 2 and needle clamp 6 When height or position of th...

Page 22: ... eyelet to the blade point of looper passes the rear of the needle and comes to the position of the right end of left needle is the same as dimension B from the top end of needle eyelet to the blade point of looper when needle bar comes down from the upper dead point the blade point of looper passes the front of needle bar and comes to the position of the right end of left needle A B Going of loop...

Page 23: ...iming is advanced In this case loosen setscrews 1 in the sprocket and finely turn upper pulley 2 in the reverse direction 2 In case dimension A when the looper advances is larger than dimension B when the looper retreats the looper timing is advanced needle timing is retarded In this case loosen setscrews 1 in the sprocket and finely turn upper pulley 2 in the normal direction Caution Be careful n...

Page 24: ... the needle gauge when looper 1 is in the extreme right position 2 Returning amount of looper for each gauge dimension A 2 needle 3 needle Needle gauge Returning amount A Needle gauge Returning amount A 3 2 4 9 4 4 5 4 8 4 1 4 8 4 1 5 6 3 7 5 6 3 7 6 4 3 3 6 4 3 3 Dimension A is the dimension fromthe center of right needle to the top end of looper 1 Unit mm A 1 5 4 0 to 0 05 mm 1 6 5mm ...

Page 25: ...f looper comes to the center of middle needle from the extreme right position After the adjustment fix the looper holder with setscrew 2 in the looper holder Blade point 5 of the looper comes in contact with the right needle when rear needle guard 6 fails to work So be careful When the returning amount is large loop of needle thread becomes large and it is apt to fall As a result stitch skipping o...

Page 26: ...from the left end of left needle by approximately 1 mm 1 1 mm dimension B To align B Reference Dimension C height of left needle from top surface A of throat plate Unit mm 2 needle 3 needle Needle gauge Height of left needle C Needle gauge Height of left needle C 3 2 9 7 4 0 9 3 4 8 8 8 4 8 8 8 5 6 8 5 5 6 8 5 6 4 8 0 6 4 8 0 A C 1 2 to 1 4 mm 2 Scooping height of looper dimension from the top end...

Page 27: ...st the height of the needle bar 2 After adjusting the height equally adjust the clearance A between needle 1 and needle hole 2 in the throat plate and fix the needle bar with setscrew 3 in the needle bar bracket When the height of the needle is excessively different stitch skipping needle breakage thread breakage etc will be caused Equal 1 2 A 4 3 ...

Page 28: ...oper drive arm 2 aligns with the center of the shaft of pin is the standard 2 Locus of the looper It is the standard locus of the looper that the clearance between the top end of looper and middle needle is within 0 05mm when the rear needle guard fails to work and the looper passes the left needle with a clearance of 0 1 to 0 2 mm The standard position of the cam is the position where the notch o...

Page 29: ... 1 It is possible to change the locus of the looper However do not excessively change it from the standard position 2 When changing the locus of the looper be sure to check whether the top end of left needle touches the position of 1 4 to 1 3 from the bottom face of the back of the looper When the longitudinal motion of the looper is small the rate that needle touches the back of the looper is inc...

Page 30: ...he top end of looper 3 comes from the extreme right position to the center of right needle the clearance provided between the needle and the top end of looper 3 becomes 0 to 0 05 mm Make rear needle guard 1 lightly touch the right needle and the pressing amount of the top end of needle becomes 0 1 to 0 2 mm It is the standard for the middle needle that when the top end of looper 3 comes to the cen...

Page 31: ...t in the height direction and the direction of rotation 3 After the adjustment tighten setscrews 2 and 4 Caution After the adjustment check by manual turning whether the top end of looper 3 does not come in contact with the needle When the pressing amount of rear needle guard 1 is small needle deflection increases and stitch skipping thread breakage needle breakage and worn out of the top end of l...

Page 32: ...position where timing mark 7 in rear needle guard cam 5 aligns with the center of the notch of looper longitudinal cam 6 2 Front needle guard 1 It is the standard that the clearance provided between front needle guard 9 and the needle is 0 1 to 0 3 mm 5 7 6 To align 11 Adjusting the needle guard 0 1 to 0 3 mm 3 9 0 ...

Page 33: ...m the extreme right position to the left and passes the rear side of the respective needles and fix the front needle guard with setscrew 0 Place front needle guard 9 as near as the needle to such an extent that needle thread passes smoothly in accordance with kind and thickness of thread Pulley side The cam is excessively changed from the standard position needle breakage or stitch skipping will b...

Page 34: ... 31 Standard Adjustment 12 Instlling cover of the looper and needle guard after adjusting 1 Installing bed top cover 1 1 A ...

Page 35: ...tment of 10 Locus and longitudinal motion of the looper or 11 Adjusting the needle guard has been performed apply sealant to section A and install bed top cover 1 When removing bed top cover 1 for adjustment or the like sealant is peeled off and oil leakage will be caused ...

Page 36: ...n feed dog 2 and differential feed dog 4 is 1 mm from the top surface of the throat plate 1 when feed dogs 2 and 4 are in the highest position 2 Tilt of the feed dog It is the standard that the tilt of feed dogs 2 and 4 is flush with throat plate 1 when feed dogs 2 and 4 are in the highest position 7 3 8 9 Flush 1mm 2 5 6 1 4 ...

Page 37: ...rear with a hexagonal wrench key of 2 5 mm 2 When turning feed dog tilt adjustment shaft 9 to the right or left the top ends of feed dogs 2 and 4 move up or down and the tilt of feed dogs 2 and 4 can be adjusted Caution After the adjustment check the height of feed dogs 2 and 4 When the position of the feed dog is high stitch skipping defective chain off return of feed etc will be caused Throat pl...

Page 38: ... 3 Lateral position of the feed dog It is the standard of the lateral position of the feed dog that the left and right clearances A of the feed dog in terms of the slots of the throat plate are parallel and equal 1 0 A A 1 0 2 3 7 4 6 3 2 8 5 9 4 5 6 ...

Page 39: ...earances of the feed dog in terms of the slots of the throat plate are parallel and equal with feed dog and throat plate attached When the equal clearances are set tighten setscrew 1 to fix rocking bar guide 1 0 attach rocking bar guide 2 0 and guide setscrews 1 and fix the rocking bar so that it is put between the setscrews 5 Bring feed tilt adjustment shaft 5 and feed tilt eccentric shaft 4 to t...

Page 40: ... at the position where the main feed dog travels to the extreme front position operator s side when feed momentum is set to 3 6 mm maximum 2 Position of the differential feed dog it is the standard that the position where the clearance provided between main feed dog and differential feed dog is 1 6 0 2 mm when the differential feed ratio is set to 1 1 after adjusting the position of the main feed ...

Page 41: ... it with setscrew 2 When fixing setscrew 8 in the differential feed lever set the differential feed ratio to 1 1 adjust the clearance provided between the main feed dog and the differential feed dog to 1 6 0 2 mm press the differential feed lever to the rocing bar side and fix it with setscrew Caution When the adjustment value changes greatly feed dog or throat plate will be broken When the fixing...

Page 42: ...titch length to adjust up to 1 2 to 3 6 mm Turning feed adjust knob 1 clockwise increases the stitch length and turning it counterclockwise decreases the stitch length 2 Changing the differential feed ratio Differential feed ratio is 1 0 7 to 1 2 stitch length less than 2 5 mm 1 2 3 2 3 1 Gathering Stretching 6 4 7 5 ...

Page 43: ...d ratio can be performed with micro adjust knob 6 When engraved marker 7 of the differential feed lever is aligned with the long engraved marker line on the dial plate the momentum of the main feed dog and the differential feed dog becomes almost 1 1 When the stitch length is set to more than 3 6 mm the contact of main feed dog differential feed dog and throat plate occurs due to the adjustment in...

Page 44: ...e thrust collar 1 Clearance provided between thrust collar 5 and presser shaft bushing 4 is 0 1 mm at the position where lifter lever 1 is lowered and comes in contact with height adjustment screw 3 3 Position of the lifter connecting plate 1 Adjust the clearance provided between lifter connecting plate 6 and hinge screw 7 to 0 5 mm when the presser foot is lowered in the state that the feed dog c...

Page 45: ... contact with the throat plate When the position of the presser foot is too high it comes in contact with the spreader and breakage stitch skipping etc will be caused In addition the needle tip comes out from the sole of the presser foot As a result sewing material is damaged or needle breakage will be caused In case the clearance of thrust collar 5 is large when the presser foot gets over the ove...

Page 46: ...sting the micro lifter 1 Micro lifter Adjust the micro lifter in accordance with sewing conditions for use Major applicable process 1 When twist occurs in the hemming bottom process 2 When tape is twisted in collarette 3 2 1 Down Up ...

Page 47: ...sser lifting lever 3 Then the pressr foot goes up Adjust the height accordance with the sewing conditions 2 When micro lifter knob 1 is turned clockwise micro lifter stopper 2 is raisedand comes in contact with presser lifting lever 3 Then the presser foot comes down Caution When the micro lifter is not used turn clockwise mocro lifter knob 1 and fix micro lifter stopper 2 at the highest position ...

Page 48: ...e bottom surface of looper 4 Then tighten setscrews 1 to fix the looper thread cam 2 Preventing thread winding around the looper thread cam Adjust the clearance provided between the top end of section A of looper thread winding prevention plate 5 and the edge of looper thread cam 2 to approximately 0 to 0 3 mm the plate should not come in contact with looper thread cam 2 Theread 3 4 2 1 To align 7...

Page 49: ... thread cam 2 to approximately 0 to 0 3 mm looper thread winding prevention plate 5 has a slot at the section of setscrew 6 and moves as if it rotates making setscrew 7 as the center and tighten setscrews 6 and 7 to fix the looper thread winding prevention plate When the position of looper thread cam 2 slips greatly out of position stitch skipping or defect of thread tightness on the back of the l...

Page 50: ...s 31 mm in the state that notch mark 4 on the edge of the eccentric pin 5 is located on the side of the center of main shaft standard delivery adjustment At the time of 31 mm 18 How to change needle bar stroke Draw out by more than 1 mm 7 6 At the time of 31 mm 4 6 5 At the time of 33 mm 5 ...

Page 51: ...is on the side away from the center of main shaft Caution There is a groove to fit when eccentric pin 5 is turned by 180 at the fitting section of eccentric pin 5 and counter weight 7 After the change check that the pin has completely entered the groove At the same time check whether eccentric pin 5 has completely entered up to the end When the pin is excessively pressed abnormal noise or worn up ...

Page 52: ...left and top end D of looper 3 protrudes by approximately 1 mm from the left end of left needle remove rubber cap 1 in the face plate and tighten the needle bar with setscrew 0 in the needle bar bracket Reference When the needle is in the highest position height E from top surface A of the throat plate to the top end of left needle is as shown in the table below 3 Adjusting the needle guard A E 0 ...

Page 53: ... end of looper 3 comes from the extreme right position to the center of right needle the clearance provided between the right needle and the top end of looper 3 becomes 0 to 0 05 mm and the pressing amount of the top end of the needle becomes 0 1 to 0 2 mm It is the standard for the middle needle that when the top end of looper 3 comes to the center of middle needle the clearance provided between ...

Page 54: ...f 6 1 the height of the spreader 1 Height from the top surface of throat plate 2 to spreader 1 is 10 0 to 10 5 mm 2 Clearance provided between spreader 1 and spreader thread guide 2 is 0 4 to 1 0 mm 3 Clearance provided between spreader thread guide 3 and needle clamp thread guide 4 is 0 8 to 1 2 mm 0 8 to 1 2 mm 0 4 to 1 0 mm 10 0 to 10 5 mm 4 3 1 2 ...

Page 55: ... 52 Standard Adjustment Results of lmproper Adjustment 1 Refer to 6 Adjusting the spreader ...

Page 56: ...not use oil addition agent sinse deterioration of lubricating oil or machine trouble will be caused Remove oil hole cap 1 on which OIL is indicated and fill the oil reservoir with lubricating oil up to the level between the upper and lower engraved marker lines of oil gauge 0 Checking before using the sewing machine 1 Check oil gauge 0 and make sure that lubricating oil level is between the upper ...

Page 57: ... 4 even when oil filter 1 is replaced with a new one remove six setscrews 6 in the oil pan remove oil pan 5 and tilt the machine head to the rear up to the position where pipe connecting joint screw 9 can be removed 2 Oil sucked up from gear pump 7 passes oil pipe 8 and enters oil filter 1 from pipe connecting joint screw 9 When the lubricatin oil does not rise to oil circulation identifacation wi...

Page 58: ...F with C D and keep pressing D for more than two seconds to return to the normal mode When the thread trimmer is not installed proceed to 2 C mode Thread trimmer safety switch release to release the safety switch since LED M does not rotate C mode Thread trimmer safety switch release Setting when thread trimmer is not used IA S6 is displayed with C Set IA S6 to IA NO Screen returns to the normal m...

Page 59: ... the figure with cord clamp 6 and setscrew 7 supplied with the machine 3 Connect the connector of detector 1 to the connector of detector of SC 380 control box Turn ON the power set the sewing machine controller to 1 position setting needle UP position stop and lightly depress the pedal to operate the sewing machine by 2 to 3 stitches Then turn OFF the power at the position where the sewing machin...

Page 60: ...ing 1 2 Thread path 1 3 Needle guard 1 4 Needle 1 5 Needle heat 1 6 Thread 1 7 Thread tension 1 8 Interference 1 9 Chain off thread defect 2 1 Thread guide 2 2 Looper thread cam adjustment 2 3 Thread tension To the next page 1 A Thread caught in thread guide Incorrect threading 2 A Resistance produced by flaw burr rust etc around needle entry of throat plate stitch tongue looper spreader needlethr...

Page 61: ...e point hits needle guard due to incorrect position 5 A Too thin needle for fabric used 6 A Needle thread tension is too strong 7 A Feed dog is too high or needle height is too low resulting in needle breakage due to needle swerve 1 A Incorrect height or incorrect position front and rear 2 A Moving amount front and rear is ill balanced Replace it with good quality of thread Adjust longitudinal mom...

Page 62: ...Refer to the standard adjustment figures Refer to threading diagram Use needle guard Reduce the tension Same described in page Thread breakage by needle heat Refer to standard adjustment Refer to the standard adjustment figures Replace it with the genuine part Replace the needle with new one Correct the mounting direction Use UY128GAS Do not use nipper Correct height position to appropriate height...

Page 63: ...dard adjustment figures Refer to the standard adjustment figures Replace it with the genuine part Replace the needle with new one Correct the mounting direction Use UY128GAS Do not use nipper Correct height position to appropriate height Refer to standard adjustment Refer to threading diagram Do not use Refer to the standard adjustment figures Same described in page Thread breakage by needle heat ...

Page 64: ...s Refer to threading diagram Refer to the standard adjustment figures Increase tension Refer to the standard adjustment figures 4 A Looper 4 B Needle 4 C Needle height 4 D Threading 4 E Looper adjustment 4 F Looper thread tension 4 G Looperthreadcamtiming Troubles 1 Troubles 2 Cause 1 Cause 2 Corrective measures From the previous page To the next page 5 4 Needledoesnotscoopthe looper thread Triang...

Page 65: ...ures Refer to threading diagram Refer to the standard adjustment figures Increase tension Refer to the standard adjustment figures 5 A Spreader 5 B Needle 5 C Spreader adjustment 5 D Spreader thread guide 5 E Needle height 5 F Threading 5 G Needle clamp thread guide 5 H Spreader thread tension 5 I Spreader take up thread drawing in amount Troubles 1 Troubles 2 Cause 1 Cause 2 Corrective measures F...

Page 66: ...diagram Increase tension Refer to the standard adjustment figures Refer to the standard adjustment figures 6 A Needle 6 B Spreader adjustment 6 C Needle height 6 D Threading 6 E Spreader thread tension 6 F Spreader pull off 6 G Spreader thread guide Troubles 1 Troubles 2 Cause 1 Cause 2 Corrective measures From the previous page To the next page 5 6 Skipping in top covering stitch Middle Correct M...

Page 67: ...dard adjustment figures Refer to the standard adjustment figures Refer to the standard adjustment figures Refer to threading diagram Increase tension Refer to the standard adjustment figures 7 A Spreader 7 B Needle 7 C Spreader adjustment 7 D Spreader thread guide 7 E Needle height 7 F Threading 7 G Spreader thread tension 7 H Spreader pull off drawing in amount of thread From the previous page To...

Page 68: ... amount of looper thread is too much Replace the needle with the new one Use UY128GAS Refer to the standard adjustment figures Refer to threading diagram Increase R Polish correctly Replace it with the genuine part Refer to the standard adjustment figures Increase tension Lift thread guide position Refer to the standard adjustment figures Do not use nipper Reduce drawing in amount of thread 8 A Ne...

Page 69: ... 66 One chain stitch by right needle One chain stitch by middle needle One chain stitch by left needle Right needle thread miss Middle needle thread miss ...

Page 70: ... new one Use UY128GAS Replace the looper when modified or its shape is changed too much Refer to the standard adjustment figures Refer to threading diagram Increase tension Adjust the thread guide position upward Do not use nipper 9 A Throat plate 9 B Needle 9 C Looper 9 D Needle height 9 E Threading 9 F Needle thread tension 9 G Needle thread guide rod 9 H Auxiliarythreadtentionadjustment Trouble...

Page 71: ...uch Refer to the standard adjustment figures Increase tension Refer to threading diagram Increase tension Reduce drawing in amount of thread Correct or replace part Replace needle with new one Use UY128GAS Replace the looper when modified or its shape is changed too much Refer to the standard adjustment figures Refer to threading diagram Increase tension Refer to the standard adjustment figures Re...

Page 72: ...dified or its shape is changed too much Refer to the standard adjustment figures Increase tension Refer to threading diagram Increase tension Reduce drawing in amount of thread Replace when modified or its shape is changed too much Use throat plate provided with long stitch tongue Refer to threading diagram Reduce tension Reduce tension Increase drawing in amount Troubles 1 Troubles 2 Cause 1 Caus...

Page 73: ... Replace when polished or its shape is changed too much Refer to the standard adjustment figures Refer to the standard adjustment figures Refer to the standard adjustment figures Increase tension Refer to threading diagram Increase tension Replace when its shape is modified or changed too much Replace needle with new one Use UY128GAS Modify or replace Troubles 1 Troubles 2 Cause 1 Cause 2 Correcti...

Page 74: ...es F Drilled hole 17 G JUKI logo type H Installing position of stopper for drawer on the reverse side E 130 810 159 77 5 75 R30 248 76 5 46 233 5 506 5 99 5 46 23 326 5 57 251 5 23 23 115 40 10 ø 26 ø 8 5 ø 26 ø 10 5 30 3 5 X X D 360 570 60 90 F A C 66 33 Y Y 3 R10 R10 X X 57 R 2 1 ø 4 8 439 B 192 120 23 21 11 40 R 1 0 R 2 1 R10 R 21 R21 R10 R 1 0 R10 R10 50 Z Z R21 R21 R10 22 21 40 R 3 0 272 R 1 ...

Page 75: ...n this engineer s manual is subject to change for improvement of the commodity without notice 03 11 Printed in Japan E R INTERNATIONAL SALES H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81 3 3430 4001 to 4005 FAX 81 3 3430 4909 4914 4984 TELEX J22967 Copyright c 2003 JUKI CORPORATION All rights reserved throughout the world ...

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