Brother EF4-V41 Service Manual Download Page 1

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From the library of: Superior Sewing Machine & Supply LLC

Summary of Contents for EF4-V41

Page 1: ...SERVICE MANUAL FOR V SERIES OVERLOCK SEWING MACHINE EF4 V41 V51 MA4 V61 EF4 V71 V81 MA4 V91 EF4 V72 V82 MA4 V92 From the library of Superior Sewing Machine Supply LLC ...

Page 2: ... DISASSEMBLY 30 III Covers 30 IZ1 Presser foot mechanism 31 00 Knife mechanism 32 1 1 Under looper mechanism 33 liD Over looper mechanism 34 Double chain stitch looper mechanism 35 1 Needle bar mechanism 36 I Feed mechanism 37 II Upper feed mechanism 38 ASSEMBLY 41 III Upper feed mechanism 41 IZ1 Feed mechanism 45 00 Needle bar mechanism 48 1 1 Under looper mechanism SO Over looper mechanism 52 00...

Page 3: ...ic wheel 76 H2l Adjusting the standard position of the horizontal feeding level feed adjust arm 77 111 Adjusting the horizontal feed amount 77 Ml Adjusting the standard of the vertical feeding 78 1m Adjusting the height of the upper feed bar 79 11 Adjusting the clearance between the upper feed dog and the lower feed dog 80 lll1 Adjusting the vertical feed amount of the upper feed dog 81 1m Adjusti...

Page 4: ...3 4 Stitch width 2 mm Stitch width 3 mm Stitch width 4 mm 5 6 7 Stitch width 5 mm Stitch width 6 mm Stitch width 7 mm Model plate ii i iiiiiiiiiiiiil Specification Stitch width Device MADE IN JAPAN Model Max sewing speed 6000 6500 spm EF4 V71 EF4 V72 High speed single needle adjustable top and bottom feed overlock sewing machine EF4 V81 EF4 V82 High speed twin needle adjustable top and bottom feed...

Page 5: ...tion CV1 0 0 0 0 0 0 Pneumatic front suction CV3 0 0 0 Vacuum type rear suction CV4 0 0 0 0 0 0 Vertical chain cutter 0 0 0 Vacuum type front suction CV6 Chain cutter only rear suction CV7 0 0 0 0 0 0 Chain cutter only front suction CV9 0 0 0 Pneumatic CH1 0 0 0 0 0 0 Horizontal chain cutter Vacuum type CH2 0 0 0 0 0 0 Chain cutter only CH3 0 0 0 0 0 0 Pneumatic knee switch TC1 0 0 0 0 0 0 Tape cu...

Page 6: ...dle with three threads Two needles with four threads Serging Plain stitching Blind hemming Mock safety Stitch formation 514 515 516 Two needles with four threads Two needles with four threads Two needles with five threads Safety stitching Safety stitching 3 From the library of Superior Sewing Machine Supply LLC ...

Page 7: ...11 5 5 6 504 6 02 5 a 5 n 6 1 3 6 0 6 2 6 1 3 6 2 5 Ill 14 7 7 504 03 3 8 3 n 4 3 1 4 0 9 3 8 0 7 2 5 1 6 II 9 5 5 505 04 3 3 3 m 4 1 2 4 0 9 3 8 0 7 2 5 1 6 II 9 5 5 Using spreader 05 4 3 4 1 2 1 4 5 9 0 7 1 3 5 1 6 k 14 5 5 Using spreader NOTE The rotating speed has been set according to Brother s standard sewing specification 4 l j Max s spm 8500 8000 8500 8500 8500 S Standard specification H H...

Page 8: ... 0 8 2 8 5 1 6 11 7500 s Ruffling attachment 504 m A G Ruffling with piping Parts of 09 5 1 3 5 0 8 3 2 0 8 2 8 5 1 6 11 7500 s ruffling m A G attachment 504 n Taping with thin and 10 4 4 s medium thick materials 5 1 3 5 0 9 3 8 0 7 2 5 1 6 11 8500 H Tape guide 6 6 6 H 504 11 5 5 H Taping with bulky knits Tape guide 6 1 3 6 0 6 2 6 1 3 6 2 5 Ill 14 8000 H with angle 7 knife 7 H 504 n Backtacking w...

Page 9: ...foot mm Type of spee mm feed dog spm 4 H Medium thick and 5 heavy materials 4 2 2 0 9 3 8 0 7 2 5 5 1 6 I 11 8000 H 6 A B C D 7 4 H Medium thick and 5 heavy materials 4 2 2 6 0 9 3 8 0 7 2 5 5 1 6 lit 11 7000 H 7 A B C 5 n Thin and medium thick materials 4 3 6 0 9 3 8 0 7 2 5 5 1 6 Ill 11 8000 H 7 A B C 5 n Thin and medium thick materials 4 3 6 0 9 3 8 0 7 2 5 5 1 6 Ill 11 7000 H 7 A B C 5 n Bulky...

Page 10: ... 3 2 0 8 2 8 5 1 6 11 7500 H attachment 6 m A G piping parts 512 n Taping with thin and medium thick 41 5 5 materials 2 4 2 2 0 9 3 8 0 7 2 5 5 1 6 Ill 11 8000 H Tape guide 6 6 H 514 2 H Taping with thin and medium thick 42 5 5 materials 2 4 2 2 0 9 3 8 0 7 2 5 5 1 6 Ill 11 7500 H Tape guide 6 6 H Mock safety 45 5 5 H Taping with bulky knits Tape guide 6 2 4 2 2 6 0 6 2 6 1 3 5 5 1 6 14 8000 H wit...

Page 11: ...63 3 3 Thin and medium 4 4 s thick materials 5 2 5 3 5 0 9 3 8 0 7 2 5 1 6 14 7500 H 6 6 r 6 hi 7 A B C D 7 516 7 64 3 3 Thin and medium 4 4 s thick materials 5 2 4 3 5 0 9 3 8 0 7 2 5 1 6 14 7500 H 6 6 515 6 ld 7 A B C D 7 Using spreader 7 65 4 4 Medium thick and 5 5 s heavy materials 2 5 5 0 9 3 8 0 7 2 5 1 6 16 7500 H 7 6 6 ld 6 A B C D 7 516 7 66 4 4 Medium thick and 5 5 s heavy materials 6 2 ...

Page 12: ... attachment 6 6 6 516 m A G 5 t Ruffling with s medium thick and 72 5 5 heavy materials Ruffling 2 4 5 0 8 3 2 0 8 2 8 5 1 6 14 7000 H attachment 6 6 6 m A G Using spreader t Ruffling and piping with thin and medium thick Ruffling 14 7000 s materials 75 5 2 5 3 5 0 8 3 2 0 8 2 8 5 1 6 attachment piping parts A G 516 m 5 t Ruffling and piping with thin and medium thick Ruffling s materiaio 76 5 2 4...

Page 13: ... 5 2 4 5 5 0 9 3 8 0 7 2 1 6 materials 5 16 7500 H 6 Tape guide 6 515 6 H Using spreader 85 3 3 Extra heavy materials Tractor foot 2 5 3 1 2 5 0 7 1 4 3 5 2 5 18 6500 E l _ with angle 5 5 knife 516 A B C 5 Extra heavy materials 86 5 2 4 3 5 1 2 5 0 7 1 4 3 5 2 5 18 6500 Tractor foot E with angle A B C D knife Using spreader lw Binding with thin 89 4 4 and medium thick 2 5 3 0 9 3 8 0 7 2 5 1 6 14 ...

Page 14: ... feed dog spm 71 01 3 3 H 4 4 Ill Thin and medium 1 3 0 9 3 8 0 7 2 5 5 5 6 11 6500 H thick materials 5 5 6 504 6 1 6 81 22 4 4 H 5 5 Thin and medium 2 4 2 2 0 9 3 8 0 7 2 5 5 5 6 11 6500 H thick materials 6 6 7 514 7 1 6 91 63 3 3 p 4 4 2 3 5 0 7 2 5 5 6 14 6500 Thin and medium 5 5 0 9 3 8 H thick materials 1 q hi 6 6 7 516 7 1 6 91 65 3 3 p 4 4 5 5 6 16 6500 Medium thick and 5 2 5 5 5 0 9 3 8 0 ...

Page 15: ... 5 5 4 6 6 11 6000 H thick materials 5 5 Using small presser 1 25 72 02 5 a 5 n 6 1 3 6 0 6 2 6 1 3 6 5 6 2 8 lh 14 5000 E Bulky knits With angle knife 1 7 504 1 25 a H 72 08 5 1 3 5 0 9 3 8 0 7 2 5 5 3 5 8 11 5000 E Shirring 504 1 25 n 72 09 5 1 3 5 0 9 3 8 0 7 2 5 5 4 7 8 11 5000 E Shirring with piping 504 1 25 82 22 4 4 n 5 5 Thin and medium 1 2 4 2 2 0 9 3 8 0 7 2 5 5 4 6 6 I 11 6000 H thick m...

Page 16: ... 9 3 8 0 7 2 5 5 3 5 8 I 11 5000 E Shirring 6 514 1 25 5 9 2 4 2 2 0 9 3 8 0 7 2 5 5 3 5 8 I 11 5000 E Shirring 6 512 Mock safety 1 25 5 n 2 4 2 2 0 9 3 8 0 7 2 5 5 4 7 8 Ill 11 5000 E Shirring with piping 6 514 1 6 5 n 2 4 2 2 0 9 3 8 0 7 2 5 5 4 7 8 IIi 11 5000 E Shirring with piping 6 512 1 6 5 I Taping with thin 2 4 2 2 6 0 9 3 8 0 7 2 5 5 4 6 6 11 6000 H and medium thick materials 7 514 1 6 5...

Page 17: ...5 516 5 Using small I presser 1 25 92 64 3 3 flu 4 4 5 2 4 3 5 0 9 3 8 0 7 2 5 5 4 6 6 14 6000 H Plain stitching 6 515 6 7 Using spreader 7 1 25 92 65 3 3 f 4 4 5 2 5 5 5 0 9 3 8 0 7 2 5 5 4 6 6 16 6000 H Plain stitching l Ill 6 6 1 516 7 1 25 92 66 3 3 fld 4 4 5 2 5 5 5 0 9 3 8 0 7 2 5 5 4 6 6 16 6000 H Plain stitching 6 515 6 7 Using spreader 7 1 25 92 69 4 4 f u 5 2 5 3 5 0 9 3 8 0 7 2 5 5 3 5 ...

Page 18: ...ed dog spm Cmml 4 P u 0 7 2 4 7 8 14 5000 E Shirring 2 5 3 5 0 9 3 8 5 5 with piping 6 516 1 25 4 P 0 7 2 5 5 4 7 8 14 5000 E Shirring 2 4 3 5 0 9 3 8 with piping 516 6 Using spreader 1 25 5 pld Shirring 2 5 5 0 9 3 8 0 7 2 5 5 4 7 8 14 5000 E with piping 6 516 1 25 5 pld Shirring 2 4 5 0 9 3 8 0 7 2 5 5 4 7 8 14 5000 E with piping 6 515 Using spreader 1 25 5 6 21 5500 E Extra heavy 2 5 5 6 0 9 3 ...

Page 19: ...bly moves up and down on the eccentric part of the crank shaft 2 The needle driving crank rod assembly moves the needle bar clamp assembly e up and down via the needle shaft 3 The needle bar attached to the needle bar clamp assembly e is guided by needle bar bushes U 9 and D 6 and is moved up and down 16 From the library of Superior Sewing Machine Supply LLC ...

Page 20: ...w the under looper connecting rod mounted on the eccentric part ofthe crank shaft moves up and down 2 The under looper shaft arm oscillates 3 The motion is transmitted to the under looper holder 0 and the under looper via the under looper shaft e 17 From the library of Superior Sewing Machine Supply LLC ...

Page 21: ...own on the eccentric part of the crank shaft 2 The over looper connecting rod assembly oscillates the over looper arm 0 via the shaft arm and the over looper shaft 0 3 The motion is transmitted to the over looper holder 6 via the over looper guide holder then the over looper follows the ideal track 18 From the library of Superior Sewing Machine Supply LLC ...

Page 22: ... transmitted to the chain stitch looper holder and the chain stitch looper via the longitudinal feed shaft Double chain stitch looper oscillating mechanism 1 When the crank shaft 0 rotates in the direction of the arrow the under looper shaft arm oscillates 2 The motion is transmitted to the chain stitch looper lever 0 via the chain stitch looper link 3 The chain stitch looper lever 0 moves the cha...

Page 23: ...ected to the upper knife driving rod assembly 8 oscillates 3 The upper knife differential arm oscillates the attached upper knife holder 9 and the upper knife Lower knife mechanism 4 The lower knife 9 is attached to the lower knife holder 6 and is engaged with the upper knife 0 via the spring The lower knife holder guide positions the lower knife a and guides the lower knife holder 6 20 From the l...

Page 24: ...0 attached to the presser bar lifter lever and the presser arm shaft 9 moves the presser arm fi up via the presser arm shaft e and the pin 3 When the presser bar lifter is lowered in the direction of the arrow the presser bar assembly is caught by the end of the presser bar lifter and is raised The presser arm fi is released from the pressure of the presser spring en 21 From the library of Superio...

Page 25: ... foot lifter lever 0 is lowered the presser bar lifter lever rotates and the upper feed bar lifter mmoves the upper feed support bar 4 up and down 2 When the upper feed dog attached to the tip of the upper feed support bar is raised 5 mm the presser arm starts to rise 22 From the library of Superior Sewing Machine Supply LLC ...

Page 26: ...ed lever moves the slide block on the differential feed arm vertically via the differential link lever e and the differential feed adjust link 2 The differential feed amount is transmitted to the differential feed bar fi via the differential feed link and the differential feed dog operates For gathering feeding the differential feed lever is set to lower position For stretched feeding the differen...

Page 27: ...f the feed adjust shaft 0 enters part of the eccentric cam 2 The stitch length can be adjusted by turning the pulley while the tip of the feed adjust shaft 0 enters part ofthe eccentric cam with the feed adjust shaft 0 pressed It is convenient to align the graduations on the pulley with the reference mark on the belt cover After changing the stitch length it can be fixed using the screw 24 From th...

Page 28: ... transmitted to the level feed adjust arm block assembly 9 via the feed arm e and the feed shaft 0 The horizontal feed amount is transmitted to the feed arm via the feed rock Iink fj and the feed arm oscillates 3 The level feed crank shaft transmits the motion to the upper feed bar G and the upper feed bar G is moved horizontally 25 From the library of Superior Sewing Machine Supply LLC ...

Page 29: ...s changed using the level feed adjust lever via the feed adjust plate 0 and the level feed adjust lever shaft the rocking amount of the feed arm 6 is changed via the feed rock link Then the horizontal feed amount of the upper feed dog is changed 26 From the library of Superior Sewing Machine Supply LLC ...

Page 30: ... is transmitted to the vertical feed adjust arm block assembly 0 via the upper knife differential arm I the vertical feed amount is transmitted to the feed lifting link I and the feed arm 9 osciIIates 3 The vertical feed crank shaft G transmits the motion to the upper feed bar assembly and the upper feed bar is moved up and down 27 From the library of Superior Sewing Machine Supply LLC ...

Page 31: ...slide block 0 is changed using the vertical feed adjust lever via adjust lever shaft UL 0 the rocking amount of the feed arm is changed via the feed lifting link 0 Then the horizontal feed amount of the upper feed dog is changed 28 From the library of Superior Sewing Machine Supply LLC ...

Page 32: ... II Lubrication 29 From the library of Superior Sewing Machine Supply LLC ...

Page 33: ...e set screw and remove the cloth plate along with the cloth plate lower 7 Remove the two screws and the cloth guide 6 8 Remove the two screws and the cloth guide set plate 9 Remove the six screws the feed bar cover and the packing 1 0 Remove the two screws and the eccentric wheel cover 4Il 11 Remove the four screws and the frame side cover G 12 Remove the two screws and the front cover L guide 13 ...

Page 34: ...3 Loosen the bolt for the presser bar Iifter arm and remove the presser arm shaft 0 4 Remove the stud screw and the presser bar lifter link from the presser foot lifter lever Then remove the presser bar lifter lever 5 Remove the two screws and the lever adjust plate 6 Remove the screws the thread guide pipe G and the looper thread guide l for the safety stitch sewing machine only 31 From the libra...

Page 35: ...ife 0 2 Remove the screw the upper knife holder and the nut 3 Remove the bolt the lower knife I and the lower knife presser e 4 Loosen the screw and remove the lower knife holder D and the spring 32 From the library of Superior Sewing Machine Supply LLC ...

Page 36: ... screw under looper thread guide L eI and the under looper 0 4 Remove the screw and looper thread take up L 9 5 Loosen the screw of the movable needle guard and the bolt and remove the under looper holder from the under looper shaft 6 Remove the movable needle guard from the under looper holder 33 From the library of Superior Sewing Machine Supply LLC ...

Page 37: ...ws the inside cover and the looper thread guide 9 4 Loosen the screw and remove the over looper from the over looper holder 5 Loosen the bolt for the over looper arm 6 Remove the two screws the over looper mechanism assembly 4Ii from the over looper shaft NOTE The guide bush positioning plate I has already been adjusted before shipping Do not remove it unless it is necessary 34 From the library of...

Page 38: ...e screw and the felt support assembly 4 Remove the screw chain stitch needle guard B needle guard F 6 and chain stitch needle guard F 5 Loosen the bolt and remove the chain stitch looper holder 0 from the longitudinal feed shaft 6 Remove the stud screw and the thread handler bracket 7 Loosen the two set screws and remove the thread take up assembly tD 35 From the library of Superior Sewing Machine...

Page 39: ...le bar 3 Remove the screw 0 of needle bar bush U 9 4 Remove the oil cap 9 and loosen the screw of the needle bar clamp fj Remove the needle bar by lifting it from above 5 Loosen the bolts for the needle balance and the needle driving crank rod assembly Remove the needle bar clamp assembly 4D along with the needle shaft 4D 36 From the library of Superior Sewing Machine Supply LLC ...

Page 40: ...sition Remove the oil cap on the rear side of the machine head and the oil cap on the machine side 5 Remove the two screws and the longitudinal feed arm stopper for the safety stitch sewing machine only 6 Loosen the bolts for the feed arm assembly 4 0 the differential feed arm 4D and the main feed arm 4 7 Tilt the machine head until it stops Loosen the set screw of the set collar and remove the fe...

Page 41: ...move the two screws and the feed adjust plate e from the level feed adjust lever shaft 5 Loosen the set screw and remove upper feed bar guide L 6 6 Remove the stud screw of the level feed crank shaft The upper feed bar assembly will come off 7 Loosen the set screws for the two set collars attached to the level feed crank shaft and the bolt of the feed arm Remove the level fee crank shaft 38 From t...

Page 42: ...en the set screw for the set collar 0 attached to adjust lever shaft UL 0 and the bolt of the vertical feed adjust lever Remove adjust lever shaft U L 0 4 Loosen the adjust screw 6 and remove it along with the spring 5 Remove the screw and silicone tank assembly U 6 Loosen the set screw and remove upper feed bar guide R 39 From the library of Superior Sewing Machine Supply LLC ...

Page 43: ...rs 4n and the bolt of the feed arm 4D Remove the screw of the vertical feed crank shaft 0 8 Remove the upper feed bar assembly from the presser arm shaft bush tD The wick is attached to the upper feed bar assembly 9 Remove the vertical feed crank shaft 0 40 From the library of Superior Sewing Machine Supply LLC ...

Page 44: ...the vertical feed crank shaft 0 using the set collar so that the end of the vertical feed crank shaft 0 protrudes 6 mm from the frame surface 2 Attach the upper feed bar assembly 0 along with the wick to the presser arm shaft bush 9 3 Secure the vertical feed crank shaft 0 using the screw 41 From the library of Superior Sewing Machine Supply LLC ...

Page 45: ...set collar and the bolt ofthe vertical feed adjust lever 5 Secure the vertical feed length control plate using the screw 6 Attach the set screw knob Q to adjust lever shaft UL i using the set screw 4ID 7 Insert the spring 4 into the frame and tighten the adjust screw 42 From the library of Superior Sewing Machine Supply LLC ...

Page 46: ...vel feed crank shaft 0 and tighten the stud screw 3 Secure upper feed bar guide R 0 using the set screw Move the upper feed bar assembly 0 backward or forward and position upper feed bar guide R 0 so that it does not touch the upper feed bar assembly e 4 Attach silicone tank assembly U using the screw 5 Attach upper feed bar guide L using the set screw 6 Attach the feed adjust plate to the level f...

Page 47: ...ntal feed 8 Attach the level feed length control plate CD using the screw 9 Attach the set screw knob 4i to the feed adjust plate using the set screw tD 10 Attach the spring 44 From the library of Superior Sewing Machine Supply LLC ...

Page 48: ...ety stitch sewing machine the longitudinal feed arm should be also inserted Insert the shaft of the differential feed link 6 into the differential feed adjust link and the slide block and place them on the differential feed arm 8 2 Position the feed shaft 0 using the set collar so that the end of the feed shaft 0 is flush with the inside face of the bush 45 From the library of Superior Sewing Mach...

Page 49: ...he differential feed adjust lever through the bush set collar and the differential link lever and remove any looseness on the left and right of the differential feed adjust lever and tighten the set screw ofthe set collar Hang the spring S Attach the longitudinal feed arm stopper using the screw Only for V61 V91 V92 6 Attach the differential stitch control plate 6 using the bolt 7 Attach the set s...

Page 50: ...ferential feed adjust lever Then tighten the bolts again Adjusting the feed of the main feed bar and the differential feed bar Before this adjustment set the movement of the main feed dog to 3 8 mm 1 Temporarily tighten the differential link lever C until the slide block of the differential feed arm is positioned 6 mm above the differential feed arm when the differential feed adjust lever is align...

Page 51: ...dle clamp 3 Attach the screw of needle bar bush U 4 Turn the pulley to set the needle driving crank rod 0 to its highest position then tighten the bolt of the needle driving crank rod e so that the needle bar clamp is positioned 3 mm under the end of the bush NOTE Make sure that the pulley turns easily 5 Tighten the bolt of the needle balance so that it aligns with the top of the frame when the ne...

Page 52: ...the needle bar to find n eedle locati n Dimension H S Standard H High lift E Extra high lift V411 V611 V71 10 0 2 mm 10 9 0 2 mm 12 0 2 mm H H H V721V91 1V92 VS1 I V81 I V82 11 4 0 2 mm 12 0 2 mm 8 Turn the pulley to move the needle bar 0 to its highest position Refer to the above table adjust the clearance between the needle tip and the needle plate top and fix it 9 Remove the needle the needle p...

Page 53: ... holder 0 Adjusting the farthest left position of the under looper D Turn the pulley to move the under looper all the way to the left Loosen the bolt Move the under looper holder 0 so that there is a 3 8 mm clearance between the center of the needle and the under looper point Raise the needle from its lowest position Adjust the under looper holder 0 so that the under looper point overlaps the need...

Page 54: ...0 05 mm clearance between the needle and the under looper Adjusting needle guard F D Attach needle guard F to the needle plate support bracket using the screw f Raise the needle from its lowest position to align the under looper point with the center of the needle Adjust the position of needle guard F so that the clear ance between needle guard F and the needle is 0 05 0 2 mm for using threads wit...

Page 55: ...er looper holder moves smoothly in the over looper mechanism assembly 2 Attach the over looper e to the over looper holder using the screw Adjust the clearance between the over looper 0 and the over looper holder as follows S standard 1 6 0 2 H high lift 0 E extra high lift 1 0 2 3 Turn the pulley slowly to pass the over looper 0 52 under the projection of the under looper without contacting each ...

Page 56: ... positioned all the way to the left The looper thread guide should be positioned 39 mm above the top ofthe frame Turn the pulley so that over looper thread take up R 0 is positioned 9 5 mm above the frame when the over looper e is at its lowest position Then tighten the screw of over looper thread take up R e Attach the thread guide bracket 4 to the over looper mechanism assembly 0 and the frame u...

Page 57: ...rd B 0 to the needle plate support bracket using the screw 4 Attach chain stitch needle guard F i to the needle plate support plate fi using the screw 5 Adjust the clearance between chain stitch needle guard B 9 and the needle to 0 mm with the needle at its lowest position 6 Adjust the clearance between chain stitch needle guard F i and the needle to 0 05 0 1 mm with the needle at its lowest posit...

Page 58: ... mm above the thread handler bracket when the needle bar is at its highest position NOTE Adjust the position of the thread take up assembly 4 so that it is centered at the slo of the thread handler bracket CID 9 Attach the looper thread guide to the frame using the screw 1 0 Position the thread guide pipe tD so that it 55 protrudes 2 5 mm from the side of the machine head and secure it to the fram...

Page 59: ...ch looper mechanism 3 11 Attach the felt support assembly using the screw 56 NOTE When attaching the felt support assembly it should not touch the movable needle guard From the library of Superior Sewing Machine Supply LLC ...

Page 60: ... 4 Loosen the screw Adjust the position of the lower knife holder 0 by moving it to the left or right so that the stitch width is equal to the stitch tongue width The right side of the lower knife 0 should be aligned with the extended line equal to the stitch width 5 Insertthe nut into the upper knife differential arm 9 6 Temporarily attach the upper knife fi to the upper knife holder D using the ...

Page 61: ...he upper knife 6 and the lower knife e when they engage 9 Engage the upper knife 6 with the lower knife 9 Loosen the screw The lower knife 9 presses the upper knife 6 due to pressure of the spring Then tighten the screw again 10 Insert the thread in between the upper knife 6 and the lower knife e and make sure that the thread is trimmed 58 From the library of Superior Sewing Machine Supply LLC ...

Page 62: ...sser bar lifter lever Temporarily tighten the bolt of the presser bar lifter arm 0 3 Attach the lever adjust plate to the frame using the screw 4 Attach the presser foot Iifter lever 6 and the spring to the frame using the stud screw Before attaching make sure that the link is inserted into the presser bar lifter lever 5 Attach the presser foot to the main presser arm 8 so that the front of the pr...

Page 63: ... tighten the bolt NOTE Tighten the bolt so that there is no looseness of the presser arm in the direction of the thrust 10 Press the presser foot lifter lever fi downward and adjust the lift stroke of the presser foot to 5 mm by inserting or removing the lower screw of the lever adjust plate D The lift stroke is different depending on the specification 11 Loosen the screw of the presser arm stoppe...

Page 64: ...e chain stitch looper and front cover S are 0 5 mm respectively when the upper knife is at its lowest position 4 Attach the eccentric wheel cover 9 using the screw 5 Attach the feed bar cover and the packing using the screw 6 Attach the cloth guide set plate using the screw 7 Attach the cloth guide CD using the screw 8 Attach the cloth plate and the cloth plate lower ID using the set screw 9 Attac...

Page 65: ...ws and remove the face plate cover 0 and the oil cap Safety stitch sewing machine Overlock stitch needle eedle plate 2 Loosen the screw of the needle bar clamp Turn the pulley slowly so that the needle tip enters the hole ofthe needle plate slightly Adjust the positions of the needle plate support plate and needle plate support plate B so that the slot ofthe needle plate is centered at the needle ...

Page 66: ... guard F Adjusting the under looper 0 0 5 mm overlap 1 Insert an adjustment reference needle NOTE Before adjustment position the movable knife so that it is behind the under looper point 2 Turn the pulley to move the under looper 0 all the way to the left Loosen the bolt Adjust the clearance between the under looper 0 point and the center of the needle so that it is 3 8 mm Adjust the position of t...

Page 67: ...between the under looper 0 point and the needle NOTE When the under looper 0 point is aligned with the center of the needle the movable needle guard should touch the needle Align the center of the needle with the under looper 0 point and loosen the screw Adjust the clearance between the needle and needle guard F 0 to 0 05 0 2 mm for using threads with a thread number over and including 50 thin thr...

Page 68: ...oosen the bolt Adjust dimension C the clearance between the center of the needle and the tip of the over looper when it is in its farthest left position by moving the over looper arm 6 vertically Specification Standard High lift Extra high lift Dimension A 1 6mm 0 1 0mm Dimension B 6 8mm 8 4mm 9 6mm Dimension Single needle overlock machine Safety stitch sewing machine 4 8mm Twin needle Two needle ...

Page 69: ...t position until the chain stitch looper 0 point is aligned with the center ofthe needle Loosen the bolt Adjust the clearance between the needle and the chain stitch looper 0 to 0 05 mm Make sure that chain stitch needle guard B 6 does nottouch the needle For denim specification adjust the clearance to 0 05 0 1 mm Adjusting chain stitch needle guards B and F 3 Loosen the screw S when the needle is...

Page 70: ...he cover for feed mechanism B 0 and the packing 2 Loosen the nut for the longitudinal feed arm screw using the attached wrench Sliding the nut 0 to the upper end of the longitudinal feed arm will increase the backward and forward movement sliding itto the lower end will decrease it Needletype and size DCx27 DCx27 DCx27 9 11 12 17 18 21 Backward and forward movement 2 8mm 3 1 mm 3 4mm 67 From the l...

Page 71: ...bly 0 as shown in the figure above Adjusting the forward and backward position of the upper feed dog Front feed type IBack feed typeI 1 Set the feed amount to 6 on the level feed length control plate 0 Front feed type The farthest back position 2 Loosen the bolt of the feed arm Adjust the position of the upper feed dog by moving it backward or forward so that the clearance between the upper feed d...

Page 72: ... lifter arm Just allow the stopper screw e to make contact with the presser bar lifer lever 0 I and tighten the bolt 4 Adjust the lift stroke of the presser foot to 5 mm by taking the bottom screw of the lever adjust plate in and out The lift stroke is different depending on the specification 5 Loosen the screw of the presser arm stopper I make contact the presser arm stopper with the presser arm ...

Page 73: ...ew 9 so that the clearance between the upper feed bar lifter and the presser bar lifter lever is 0 3 0 5 mm 3 Loosen the bolt of the presser bar lifter arm 0 4 Press the presser foot lifter lever 9 downward until the upper feed dog 8 is raised 5 mm above the needle plate top Make contact stopper screw of the presser bar lifter arm 0 with the presser bar lifter lever and tighten the bolt of the pre...

Page 74: ...pper knife e and lower knife to 0 5 1mm Make sure that the upper knife e does not strike front cover S fi Stitch width 4 Position the lower knife so that it is equal to the width of the stitch tongue of the needle plate NOTE In order to establish the position of the knives move the upper knife e overlap the lower knife and temporarily loosen the set screw so that due to the action of the spring th...

Page 75: ...g 0 to its lowest position 2 Loosen the bolt Adjust the main feed dog so that its second tooth from the rear is raised 1 mm above the needle plate top 1 2 mm for using V61 3 Loosen the bolt 8 Adjust the height of the differential feed dog 0 so that it is flush with the main feed dog 4 Loosen the screw 9 Adjust the height of the chain feed dog 0 so that it is positioned 0 3 0 5 mm below the main fe...

Page 76: ...e rear is raised 0 9 mm for high lift specification or 1 mm for extra high lift specification above the needle plate top 3 Loosen the bolt 8 Adjust the height of the differential feed dog 0 so that it is as same as the main feed dog 4 Loosen the screw 9 Adjust the height of the chain feed dog so that it is positioned 0 3 0 5 mm below the main feed dog for using V71 V72 V81 or V82 or 0 1 mm 0 15 mm...

Page 77: ...ed dog m m Main feed dog m m Plain stitching 2 1 2 1 0 8 Bulky 2 8 2 8 Serging 1 0 Backtacking 0 7 0 7 Ruffler 2 4 2 4 1 2 Thick material 0 9 Extra thick material 0 6 Each value in the above table shows the clearance between the feed dog and the slot on the needle plate when the main feed amount is set to the maximum and the main feed dog is at the end of the feeding When viewing the machine from ...

Page 78: ...n min Two needle cotton 48 16 5 four threads woolen yarn 48 16 5 2threads cotton 49 5 8 58 58 5 11 5 min Mock safety cotton 48 16 5 woolen yarn 48 16 5 Loosen the screws 0 I 1and Adjust the clearance referring to the tables above D c D 55 53 5 min min 55 53 5 min min 55 53 5 min min 55 53 5 min min NOTE Dimensions A and Bare the measured values when the upper knife is at its lowest position 75 E 1...

Page 79: ...nsion Fis the measured value when the over looper is at its lowest position I 27 5 max 27 5 max 27 5 max 27 5 max Dimension J is the measured value when the under looper is at the farthest left position Ill Adjusting the horizontal feeding timing position of the level feed eccentric wheel Maximum J K 12 39 12 39 13 5 39 12 39 4screw 1 Set the lower feed amount to the maximum set the stitch length ...

Page 80: ...not move Iii Adjusting the horizontal feed amount __r _ C ___ ____ 6 Q o _u 1 Set the feed amount to 10 on the level feed length control plate 0 2 Set the machine so that the horizontal feeding starts 3 Loosen the bolt of the level feed adjust lever Push the slide block against the stopper screw then adjust the clearance between them to 0 5 mm 4 Make sure that moving the lever can changes the feed...

Page 81: ... Set the upper feed dog to its lowest position 2 Remove the screw and the top cover 3 Loosen the bolt of the vertical feed adjust arm block assembly Move the vertical feed adjust lever until the vertical feed adjust arm block assembly 8 does not move and tighten the bolt again 78 From the library of Superior Sewing Machine Supply LLC ...

Page 82: ... by moving it so that there is a 13 3 mm clearance between the center of the screw of the upper feed dog and the needle platetop NOTE Loosen the adjust screw and release the spring pressure Make sure that the upper feed support bar 0 is positioned horizontally 3 Tighten the bolt of the feed arm 0 4 Apply the prtssure of the spring by tightening the adjust screw The adjust screw is positioned 23 mm...

Page 83: ...sting the above steps turn the pulley to setthe upper feed dog 0 to its highest position 2 Loosen the screw of the upper feed dog 0 Adjust the clearance between the upper feed dog 0 and the needle plate top so that it is decreased 1mm from A mm 1 Loosen the set screw 0 ofthe machine head 2 Insert a wrench into the adjusting hole of the presser arm shaft bush 8 Turn the wrench clockwise to lower th...

Page 84: ...ed 4 6 mm above the needle plate top The distance is different depending on specification For front feed type with plain stitching For example when the set screw knob of the vertical feed length control plate is set to 2 the actual vertical feed amount of the upper feed dog is as follows 4 6 0 9 0 2 3 5 upper feed dog height lower feed dog height clearance between upper and lower feed dogs actual ...

Page 85: ...cation __ Plain stitching 3 8mm 0 7 2 0 Ruffler 3 2mm 0 8 2 8 Bulky 2 6mm 1 0 3 0 Denim S Omm 0 7 1 4 Serging 5 9mm 0 7 1 3 82 Nut Loose 2 Loosen the nut and change the position of the main feed shaft e Position of match Main mark of main feed arm feed arm Plain stitching 1 Serging Upper Lower Rufflertl Bulky Denim 1 Main feed arm Middle Lower Upper t f i Lower Lower Lower Main feed shaft f Lower ...

Page 86: ...0 and the shape of the needle plate to 0 3 mm 1m m Loosen the set screw to adjust the backward and forward clearance between the cloth plate 0 and the needle plate by turning the cloth plate support collar Use the adjust screw 0 to adjust the sideways clearance 83 From the library of Superior Sewing Machine Supply LLC ...

Page 87: ...for a good one Incorrect looperthread take up position Adjust to proper position Thread passage has flaws Change part with new one Needle plate has flaws Replace itwith new one or smooth or buff surface with oil and stone Under looper has flaws Incorrecttiming of needle and looper Flaws r Burr Replace itwith new one or smooth or buff surface with oil and stone Adjust to correct timing needle clear...

Page 88: ... one or smooth surface with oil stone or buff Blunt aws Insufficient clearance of needle guard Adjust to correct clearance between needle and needle guard Incorrect timing of needle and looper Adjustto correcttiming needle clearance and position of needle guard Looper thread breakage PROBLEM ADJUSTMENT D Incorrectthreading ___ Refer to Threading diagram Excessive pressure of tension disk Adjust to...

Page 89: ...n the case of skipping between under looper and needle Adjust to correct position Adjustthe position of over looper so it is appropriate Adjust over looper and under looperto appropriate clearance between needle and over looper Adjust to suitable height Adjust to appropriate clearance Change it for a new one or smooth with oil stone or buff Blunt D Large clearance between under looper and over loo...

Page 90: ...earance between looper and needle Adjust to appropriate position Incorrect position of needle guard ___ Adjust to correct position Top of looper blunt or bent Change it for a new one or smooth with oil stone or buff Incorrecttiming of double chain stitch looper Adjust to correct timing In the case of skipping during leftward movement of looper j Large clearance between looper and needle ___ Adjust...

Page 91: ...ality Change it for larger one Adjust to suitable pressure Adjust to correct position Ill Improper chaining off verlocking PROBLEM ADJUSTMENT D Incorrectthreading Refer to Threading diagram Excessive pressure of tension disk Adjust to suitable pressure Tension disk pressure too weak Adjust to appropriate pressure Incorrect position of looper thread take up Adjust to correct position Incorrect posi...

Page 92: ...t or left Change it for a new one For model V61 replace presser foot K Ifthere is a clearance here you can not __ perform chaining off sewing lncorrecttiming between needle and looper Adjusttocorrecttiming 1 1 Puckering PROBLEM D Excessive tension disk pressure Thread size too thick Excessive presser foot pressure Needle size too big Incorrect differential ratio Height offeed dogs l Knife width to...

Page 93: ...suitable pressure Change them for new ones or regrind Adjusttoa lower level 00 Double scooping overlocking PROBLEM ADJUSTMENT D Under looper have flaws Change it for a new one or smooth surface with oil stone or buff Insufficient angle of under looper Increase angle 90 From the library of Superior Sewing Machine Supply LLC ...

Page 94: ...5 9 21 K 2 5 9 21 The numbers in the showthe thickness of the over looper For woolen yarn The numbers in the show the thickness ofthe over looper V51 V81 V82 1 Two threads with four needles 2 Mock safety stitching High lift Extra high lift e e 2 2 2 5 3 1 8 2 2 2 5 3 r h High lift Extra high lift 0 F 2 0 9 12 B 2 15 9 12 E 1 8 1 3 16 D 2 0 13 9 9 16 12 10 R 2 0 9 18 J 1 9 13 11 16 14 The numbersin...

Page 95: ...and medium thick I materials Use the high lift specification when the stitch width is 6 mm or more Use the high lift specification or extra high lift specification when the material thickness is 6 mm or more High lift 6 5 mm Extra high lift 7 5 mm When the stitch width is 6 mm or more 02 11 specifications 22 24 27 33 37 41 45 49 57 specifications 31 specification When the stitch width is 6 mm or m...

Page 96: ... 20 8 21 2 f 6 8 8 4 9 6 g 10 6 10 8 10 9 Under looper H 3 8 0 2 3 8 0 2 3 8 0 2 I 2_ 8 2 2_ 8 2 2_ 8 2 Double chain stitch looper J 64 0 1 64 0 1 64 0 1 Double chain stitch needle k 8 4 9 3 9 9 NOTES Letters I J and K show the dimensions for the V61 For specificationS H and E push the over looper guide holder against the right ofthe guide bush positioning plate For specification U push the over l...

Page 97: ...8 0 3 DT 0 eT 20 4 f T 8 9 gT 10 8 Under looper H 3 8 0 2 3 8 0 2 NOTES Letter Vith a mark show the dimensions for mock safety stitching stitch formation 512 For specification Hand E push the over looper guide holder against the right of the guide bush positioning plate For specification U push the over looper guide holder against the left of the guide bush positioning plate Letters e f and g show...

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Brother EF4-V41, Service Manual

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