JUKI Union Special MFC-7406 Скачать руководство пользователя

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7. TROUBLES AND CORRECTIVE MEASURES

Troubles

Cause (1)

Cause (2)

Corrective measures

Thread breakage

Looper thread breakage

Refer to threading diagram.

Remove the flaw, burr etc. and process the thread guide

finish. However, replace such important parts as looper or

throat plate etc. with the new part because their shape is

changed by being processed.

In case needle exchanger, or looper needle guard is worn

out, replace it with the new part.

Replace it with an appropriate needle.

Use thinner needle. Reduce the sewing speed. Use silicon

oil lubricant device.

Replace it with the thread of good quality.

Reduce thread tension. Intermediate thread guide is

positioned too high making the thread tension too strong.

Mount it in the correct position.

Remove the flaw, burr etc.

Remove the flaw, burr etc. and process the thread guide

finish. However, replace such parts as looper with the new

part because its shape is changed by being processed.

Refer to standard adjustment.

Reduce the thread tension while checking to see the tension

balance against the needle thread, top covering thread.

Threading

Thread path

Needle guard

Needle

Needle heat

Thread

Thread tension

Interference

Chain-off thread defect

Thread guide

Looper thread cam adjustment

Thread tension

To the next page

Thread caught in thread guide, Incorrect

threading

Resistance produced by flaw, burr, rust

etc. around needle entry of throat plate,

stitch tongue, looper, spreader, needle

thread take-up nipper, needle guide,

thread tension disc etc.

Strong contact of needle against needle

guard produces a sharp edge in needle

guard resulting in thread breakage.

Too thin needle for the thread used

Needle is heated depending on fabric type,

number of fabrics, sewing speed resulting

in thread breakage.

Poor quality and weakness of thread

Too strong thread tension

Interference with feed dog, throat plate due

to the incorrect mounting height of looper

Flaw produced in stitch tongue in throat

plate, feed dog, tongue in presser foot,

underside in presser foot

Resistance produced by flaw, burr, rust

etc. in stitch tongue in throat plate, looper,

looper thread cam, thread guide, thread

tension disc

Excessive tension applied due to the

incorrect position of looper thread cam

timing, thread guide

Too strong tension of looper thread

From

the

library

of:

Diamond

Needle

Corp

Содержание Union Special MFC-7406

Страница 1: ...R ENGINEER S MANUAL 29275609 No 02 2 3 Needle Flat Bed Coverseam Machine MF 7000 Series 2 3 Needle Cylinder Bed Coverseam Machine MFC 7000 Series From the library of Diamond Needle Corp...

Страница 2: ...rmation which are not covered by the Instruction Manual It is advisable to use the relevant Instruction Manual and Parts List together with this Engineer s Manual when carrying out the maintenance of...

Страница 3: ...type 43 12 Position of the presser bar 45 13 Position of the needle thread tension release without thread trimmer 45 14 Position and height of the presser foot 47 15 Position of the thread guide 47 4...

Страница 4: ...t lift 8 1 mm Lubricating oil JUKI specified oil equivalent to ISO VG32 Part No 30149207 MFC 7000 Series MFC 7406 MFC 7407 MFC 7602 MFC 7605 Sewing speed 6 500 r p m Max Stitch length 1 6 to 3 2 mm No...

Страница 5: ...pulley of the machine head is 49 mm MFC 7000 Series Sewing speed r p m 6500 140 35 120 35 6000 125 35 105 35 5500 110 35 90 34 5000 100 34 85 34 4500 90 34 75 34 4000 80 34 70 34 3500 70 34 60 33 Mot...

Страница 6: ...lass C02 H01 U03 E12 L01 U06 Needle gauge 32 3 2 mm 40 4 0 mm 48 4 8 mm 56 5 6 mm 64 6 4 mm Devices and attachments CC1 PL5 TC2 MD1 UT12 TC3 MD2 UT13 TC4 MD6 Shape of the throat plate stitch tongue A...

Страница 7: ...market U For general export T For JE JME Turkey Sub class C02 H01 K02 E11 H11 U03 E61 H21 U06 H31 Needle gauge 32 3 2 mm 40 4 0 mm 48 4 8 mm 56 5 6 mm 64 6 4 mm Devices and attachments UT1 PL1 UT2 PL4...

Страница 8: ...hing With fabric under trimmer and cloth puller H01 For hemming Basic style with hem guide H11 For hemming With cloth puller H21 For hemming Left hand fabric under trimmer H31 For hemming Left hand fa...

Страница 9: ...echanical type MF 7406 7407 7602 7605 E12 Under bed thread trimming device Code Description Applicable model CC1 Pneumatic type chain off thread cutter Horizontal type MF7602 MF7605 Cloth puller Code...

Страница 10: ...n the blade point of the looper moves to the left in the rear of the needle and to the right in front of the needle align the upper end of the eyelet of the left needle with the lower face of the loop...

Страница 11: ...Dimension B Continue turning handwheel in operating direction until bottom of looper is even with top of needle eye when looper is in front of needle If dimension A is greater than dimension B 1 Loos...

Страница 12: ...distance between the blade point of the looper and the center of the right needle is 4 4 0 1 mm 4 Height of the needle bar When the looper moves to the left and the blade point of the looper comes out...

Страница 13: ...tch may occur If the distance of C is small skip stitching and tangling stitch may occur If defective stitch occurs with the wooly nylon thread make the distance C as small as possible Loosen the loop...

Страница 14: ...ance of the middle needle becomes larger a little Top end of looper Looper Needle 0 to 0 05 mm 6 Adjusting amount of the looper avoid When the needle descends the top point of the needle touches the b...

Страница 15: ...the two screws 6 and adjust by rotating the eccentric pin 7 Amount of the avoid increases in the direction of Amount of the avoid reduces in the direction of Caution After the adjustment check again t...

Страница 16: ...e longitudinal position and inclination of the rear needle guard are in the position that when the right side of the respective needles comes to the blade top of the looper the top of the needle sligh...

Страница 17: ...ition of the rear needle guard 9 Caution Check that the rear needle guard does not break the loop of the needle thread by touching the groove of the needle Loosen the screw 1 and adjust the clearance...

Страница 18: ...the slots of the throat plate At the maximum travel the clearance of the main feed dog and differential feed dog is equal to A A B B The height of the feed dog is 1 1 mm at the top of their stroke Th...

Страница 19: ...ation of the feed dog after loosening the screw 7 and rotating the eccentric shaft inside with a slit screwdriver through the hole 8 If the position of the feed dog is high it causes the return feed s...

Страница 20: ...e extreme right position the top blade of the spreader should be between left side and middle of the spreader thread guide groove The height is 0 8 to 1 2 mm from the surface of the spreader 5 Needle...

Страница 21: ...rge If the movement amount of the spreaderisnotsetright itwillcause skip stitching of the top covering thread If the height of the spreader is not set right it will cause skip stitching of the top cov...

Страница 22: ...er thread cam pawl wire The height of the looper thread guide plate is 1 6 mm from the lowest part of the looper cam to the upper part of the looper thread guide plate The rear side of the looper thre...

Страница 23: ...the looper thread cam is too advanced the skip stitching on the back of the looper will occur If it is too retarded the tightening of the thread will be inferior If the clearance between the looper th...

Страница 24: ...esser foot touches the upper face of the throat plate at the time that the needle bar is in the lowest point 12 Position of the needle thread tension release without thread trimmer When the presser fo...

Страница 25: ...s small the bottom face of the presser foot can not contact tightly to the throat plate If the clearance is large the lifting amount of the presser foot will be reduced Adjust by loosening the two scr...

Страница 26: ...djust the height of the presser foot so that when the needle bar is in its highest point the needle point does not come out from the lower face of the presser foot 14 Position of the thread guide 1 Mi...

Страница 27: ...mes 0 5 mm on condition that the presser foot descends and rests tightly on the throat plate If the position of the presser foot is not correct it will cause defective and non straight sewing If the h...

Страница 28: ...ch it 3 Spreader balance thread guide When the spreader moved to the extreme left position it should be positioned that the top covering thread does not slacken and the spreader does not pull out the...

Страница 29: ...the loop is not formed the loop is too small and skip stitching occurs raise the needle thread release If the loop is excessively formed the loop is too large and the skip stitching occurs lower the...

Страница 30: ...2 Thread trimmer device MF 0 05 to 0 1 mm 1 2 4 7 1 3 5 6 8 7 0 1 2 3 4 3 mm 7 5 mm 0 5 mm 5 1 2 mm Standard Adjustment 1 Adjustment of the thread trimmer device 9 From the library of Diamond Needle C...

Страница 31: ...be kept flush at the time of thread trimming Loosen screw 7 and adjust upper knife 8 to the position of 7 5 mm from the right edge of feed dog At this time make sure with screw 7 that the vertical pr...

Страница 32: ...29 1 2 3 4 5 6 7 8 9 7 8 9 MF Standard Adjustment 2 Thread tension release Looper thread trimmer device From the library of Diamond Needle Corp...

Страница 33: ...ased and the separating plate works smoothly Thread tension release is simultaneously performed with the start of thread trimmer device Adjust the length of remaining needle thread after thread trimmi...

Страница 34: ...hen the blade point of the looper moves to the left in the rear of the needle and to the right in the front of the needle and the top end of the hole of the left needle aligns with the lower part of t...

Страница 35: ...s even with top of needle eye Dimension B Continue turning handwheel in operating direction until bottom of looper is even with top of needle eye when looper is in front of needle If dimension A is gr...

Страница 36: ...e right needle is 4 8 0 1 mm Right needle Looper 4 8 0 1 mm 4 Height of the needle bar When the looper moves to the left and the point of the looper comes out from the left side of the left needle by...

Страница 37: ...ll skipping stitch and tangling stitch will occur Loosen the screw 5 of the needle bar binder bracket inside the face cover and adjust the height of the needle bar Caution After the adjustment check t...

Страница 38: ...needles 2 The height of the front needle guard is 1 75 0 1 mm from the lower part of the looper The face of the guard position is parallel to all needles having a clearance of 0 25 0 1 mm No contact...

Страница 39: ...he screw 3 and move the rear needle guard back and forth Adjust the height of the front needle guard by loosening the screw 5 and move the front needle guard 4 up and down Adjust the inclination at th...

Страница 40: ...back of the looper at the position of 2 3 from the upper side of the looper Adjust when the needle is replaced with an excessively different sized needle Check that the clearance between the looper an...

Страница 41: ...le Position of D C If the engraved line E is turned more than 3 mm from D the looper path is left downward The damage of the blade point of the looper and needle breakage occur If the amount of avoid...

Страница 42: ...d be equal to A A and B B Height of the feed dog is 1 1 mm at the top of their stroke Tilt of the feed dog is parallel to the throat plate when the needle bar is in its highest position Adjust so that...

Страница 43: ...main feed dog 7 Loosen screw 2 to adjust the left right position of the differential feed dog 1 Loosen screw 9 and move the main feed dog back and forth to adjust the longitudinal position of the mai...

Страница 44: ...is in the lowest position the clearance between the needle clamp spreader thread guide and the upper face of the fixing spreader thread guide is 4 0 5 mm The center of the thread guide hole aligns wit...

Страница 45: ...the timing is too retarded the right needle is likely to be broken as the resistance of the covering thread becomes strong when it passes the covering thread looper If the movement amount of the spre...

Страница 46: ...p preventing cam Old type 1 Height of the looper thread thread guide base The position is that the highest point of the looper thread tangling preventing cam is 0 to 0 5 mm lower than the upper part o...

Страница 47: ...guide are not set right the thread may be entangled If the timing of the looper thread cam is too advanced skip stitching on the back of the looper occurs If the timing of the looper is too retarded...

Страница 48: ...ar bracket and the upper end of the presser bar bushing is 0 8 mm Presser bar bushing Presser bar bracket 0 8 mm 13 Position of the needle thread tension release without thread trimmer When the presse...

Страница 49: ...up and down If the clearance between the presser bar bracket and the presser bar bushing is too small the bottom face of the presser foot is not closely fitted on the throat plate If the clearance is...

Страница 50: ...le top does not come out from the bottom face of the presser foot when the needle bar is in its highest point 15 Position of the thread guide 1 Middle thread guide and thread guide attaching base Spun...

Страница 51: ...ning the nut 3 and rotate the screw 4 and hit it to the lever 2 so that the needle top comes 0 3 mm over from the lower part of the presser foot when the needle is in its highest point At this time lo...

Страница 52: ...touch it 3 Spreader balance thread guide When the spreader moved to the extreme left position it should be positioned that the top cover thread does not slacken and the spreader does not pull out the...

Страница 53: ...ing the thread guide 6 up and down If it is raised the loop of the needle thread becomes large If it is lowered the loop of the needle thread becomes small If the loop is not formed the loop is too sm...

Страница 54: ...ween lower knife 7 and lever 8 is to be 0 4 mm 1 Stroke adjustment common to both elctromagnetic and pneumatic type Stroke A 17mm Gauge 4 8mm or less 18mm Gauge 5 6mm or more 4 Thread trimmer device M...

Страница 55: ...nce could generate interference of knife with looper Remove hinge screw 4 remove driving lever 5 and make adjustment by turning round the connecting bar 6 Loosen the nut 1 and make adjustment by movin...

Страница 56: ...knife s pointed end Position of stopper plate When looper moves forward all the way to its limit push on the thread trimmer cylinder by hand so that the distance from the pointed end of stationary kn...

Страница 57: ...stationary knife 9 so that they are parallel to the side of movable knife 0 When looper moves forward all the way to its limit push on the solenoid so that the pointed end of stationary knife is situ...

Страница 58: ...dard Adjustment 6 Confirmation of thread trimming 5 Adjustment of operating speed of thread trimmer pneumatic type Backward travel of movable knife Forward travel of movable knife From the library of...

Страница 59: ...king adjustment of thread trimmer thread the machine and try to sew and cut off the electric power in a state that the needle bar is situated at the top dead point to disable the operation of the sewi...

Страница 60: ...m At the time of bottom dead point of needle bar the presser foot should not contact the underside of spreader when lifted At the time of top dead point of needle bar the left needle point should not...

Страница 61: ...oo small to turn remove the collar 0 Make adjustment by loosening the nut 3 and turning the screw 4 so that the clearance between the hinge screw 5 and the top end of screw is to be around 1 mm when t...

Страница 62: ...hread 3 in 3 places Raise thread tension release hook 3 to shorten the length of the remaining thread and lower thread tension release hook 3 to lengthen the length of the remaining thread Adjust thre...

Страница 63: ...tension disc 7 Remove the hinge screw 2 to confirm that thread trimmer mechanism and thread tension release mechanism work smoothly Loosen the screw 6 and move up and down the thread tension release...

Страница 64: ...p covering thread when the movable knife 1 is open 0 5 mm Top covering thread Movable knife open Movable knife close 3 4 6 5 1 8 7 9 Old type Adjusting cover thread trimme The following adjustments ar...

Страница 65: ...moving knife 0 picks up the thread from the underside where the thread goes from spreader 2 to the stitch side Loosen screws 3 and 4 and adjust so that the bottom of moving knife 0 should be 1 5 to 2...

Страница 66: ...63 4 5 6 7 8 1 2 3 9 0 1 Existing state Changed parts 5 ASSEMBLING AND ADJUSTMENT OF FIXED CAM THREAD TAKE UP 1 Parts used Standard Adjustment From the library of Diamond Needle Corp...

Страница 67: ...r cam plate 4 needle bar guard 5 and needle bar fork thread take up 6 Temporarily tighten needle bar cam plate 4 and needle bar guard 5 with screw 8 for easy assembling Part No US00050358Z US00050317E...

Страница 68: ...53 mm C B A 4 0 1 2 Needle bar cam plate and needle bar fork thread take up 3 Needle thread guide and medium thread path base Standard Adjustment Standard Adjustment From the library of Diamond Needl...

Страница 69: ...edle bar fork thread take up Adjust it to the rear side Horizontal direction 53 mm from the right hand side of needle bar cam plate 4 Height direction From the top end of needle thread eyelet installi...

Страница 70: ...read guide 2 3 4 4 4 Spreader thread guide Normally use the hole on lower side Standard Adjustment To align height of holes At the time of needle bar upper dead point Use the thread hole located in ex...

Страница 71: ...gure at the time of the lowest point of the needle bar The hole on the left hand side of the spreader thread guide When general thread is used Use the hole located on the lower side When stretchy thre...

Страница 72: ...ead top covering thread Threading Thread path Needle guard Needle Needle heat Thread Thread tension Interference Chain off thread defect Thread guide Looper thread cam adjustment Thread tension To the...

Страница 73: ...guard due to incorrect position Too thin needle for fabric used Needle thread tension is too strong Feed dog is too high or needle height is too low resulting in needle breakage due to needle swerve I...

Страница 74: ...ght to appropriate height Refer to standard adjustment Refer to threading diagram Use needle guard Reduce the tension Same described in page Thread breakage by needle heat Refer to standard adjustment...

Страница 75: ...o standard adjustment Refer to standard adjustment Replace it with the genuine part Replace the needle with new one Correct the mounting direction Use UY121GJS CS100 UY128 GBS FS300 Do not use nipper...

Страница 76: ...eading diagram Refer to standard adjustment Increase tension Refer to standard adjustment Looper Needle Needle height Threading Looper adjustment Looper thread tension Looper thread cam timing Trouble...

Страница 77: ...ustment Increase tension Refer to standard adjustment Spreader Needle Spreader adjustment Stationary spreader thread guide Needle height Threading N e e d l e c l a m p s p r e a d e r thread guide Sp...

Страница 78: ...to standard adjustment Refer to standard adjustment Needle Spreader adjustment Needle height Threading Spreader thread tension Spreader pull off Stationary spreader thread guide Troubles 1 Troubles 2...

Страница 79: ...stment Refer to standard adjustment Refer to standard adjustment Refer to threading diagram Increase tension Refer to standard adjustment Spreader Needle Spreader adjustment Stationary spreader thread...

Страница 80: ...r thread is too much Replace the needle with the new one Use UY121GJS CS100 UY128GBS FS300 Refer to standard adjustment Refer to threading diagram Increase R Polish correctly Replace it with the genui...

Страница 81: ...78 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 From the library of Diamond Needle Corp...

Страница 82: ...JS CS100 UY128GBS FS300 Replace the looper when modified or its shape is changed too much Refer to standard adjustment Refer to threading diagram Increase tension Lift the thread Do not use nipper Thr...

Страница 83: ...rd adjustment Increase tension Refer to threading diagram Increase tension Reduce drawing in amount of thread Correct or replace part Replace needle with new one Use UY121GJS CS100 UY128GBS FS300 Repl...

Страница 84: ...shape is changed too much Refer to standard adjustment Increase tension Refer to threading diagram Increase tension Reduce drawing in amount of thread Replace when modified or its shape is changed too...

Страница 85: ...o standard adjustment Refer to standard adjustment Increase tension Refer to threading diagram Increase tension Replace when its shape is modified or changed too much Replace needle with new one Use U...

Страница 86: ...ce edge Refer to standard adjustment Refer to standard adjustment Refer to standard adjustment Refer to standard adjustment Lift the position Sharpen or replace edge Refer to standard adjustment Make...

Страница 87: ...1 151 346 1 346 1 183 18 24 30 60 93 5 810 360 15 Drawer installing position 390 100 Drawer stopper installing position back side Push button switch mounting position Stand installing position 120 13...

Страница 88: ...terbore 3 2 4 0 40 125 1 173 1 208 1 58 32 337 5 225 379 1 82 5 Y Z 54 2 5 R R23 5 R 2 3 5 R 2 3 5 R 2 3 5 R 2 5 2 R 2 5 2 R25 523 533 234 5 90 5 305 1 22 24 738 346 1 346 1 264 1 159 1 66 5 1 R 2 E n...

Страница 89: ...80 130 810 600 R 2 5 R 2 5 R 2 3 5 2 2 7 R 2 3 5 264 1 40 136 5 173 1 295 Drawer stopper installing position back side 100 390 570 10 15 JUKI logotype R 6 40 21 50 R2 R 2 Detailed measurement 2 1 11 1...

Страница 90: ...66 5 1 40 32 42 191 Stand installing position Push button switch mounting position R 6 30 125 280 264 1 489 60 130 810 40 2 2 7 3 R10 R 2 0 R10 R10 R20 97 5 173 1 136 5 295 40 100 570 390 10 15 JUKI...

Страница 91: ...1 40 500 1200 70 1 340 30 600 500 R30 R 3 0 R 6 R 3 0 R 6 17 R30 R 164 1 6 0 159 1 75 100 15 390 60 570 120 40 3 8 5 26 Counterbore 1 deep with slot Stand installing position JUKI logotype Drawer stop...

Страница 92: ...R 30 R 3 0 R 6 R30 R 3 0 R 6 R 159 1 75 100 15 390 60 570 120 40 Z Z JUKI logotype Push botton switch mounting position Stand installing position Drawer stopper installing position back side 40 R 2 R...

Страница 93: ...8 5 26 19 deep 78 5 123 5 60 80 60 471 214 136 30 185 1 143 1 20 1 258 23 32 1 46 R 4 116 262 1 242 1 413 1 32 15 4 10 25 64 143 20 143 164 1 35 125 80 70 1 40 120 1 40 R2 Entire round R 2 E n t i r e...

Страница 94: ...32 214 3 8 5 26 Counterbore 1 deep with slot Z Z 66 5 1 98 53 2 0 70 1 262 1 242 1 45 R8 R8 R 8 5 26 19 deep R30 R 6 164 1 118 80 154 339 380 450 R 8 R 3 0 R 6 15 JUKI logotype 40 50 21 R 3 0 R 6 10...

Страница 95: ...l is subject to change for improvement of the commodity without notice 00 12 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...

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