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Automatic Thread Trimming Components
1. Looper mas. asm.
Preparation
™ Remove bed cover.
2. Moving knife arm installing plate mas. asm.
Preparation
™ Remove bed cover.
™ Remove looper link asm.
(See 3 of the previous item.)
™ Remove moving knife arm spring.
(See 4 of the previous item.)
3 Nut (9 mm) of
wire setscrew
1 Moving knife link shaft A
E-ring E-4
6 Moving knife link
5 Moving knife arm installing
plate mas. asm. set screw
SM4050855SP
4 Knee lifter lever shaft setscrew
SM5030455SF
2 Thread trimmer solenoid link B
E-ring E-4
Disassembly
Remove E-ring of 1 . Do not
remove moving knife link of 6.
(Remove it together with moving knife
installing plate.)
Remove E-ring of 2 and remove
thread trimmer solenoid link B.
Remove only left-side nut of 3.
Loosen setscrew of 4.
(To increase operability of 5)
Remove two setscrews of 5 and
remove installing plate mas. asm.
At this time, simultaneously
remove moving knife link.
( To prevent warp of moving knife
link)
Assembly
™ Attach moving knife arm installing
plate mas. asm.
Note : See the point on the right side.
™ Temporarily tighten setscrews
5.
™ Attach E-ring 1 of link shaft.
™ Attach thread trimmer solenoid
link B and set with E-ring 2.
™ Attach moving knife arm spring.
™ Determine position of moving
knife and securely tighten 5.
Note : See the point on the right side.
™ Raise knee lifter lever shaft by
hand and tighten lever spring
setscrew 4.
Point
™ Set moving knife link 6 and wire
setscrew.
™ Position of moving knife
Remove hook and see from the
reverse side of bed.
(See item 1 on page 21.)
™ See item 1 on page 21 for
adjustment of nut 3 of wire.
5 Looper mas. asm.
setscrew
SM5040855SN
3 Looper link asm.
2 Looper link holding shaft
(Washer A1731090000
E-ring E-3)
4 Moving knife
arm spring
1 Looper link B
E-ring E-3
Disassembly
Remove E-ring of 1.
Remove E-ring and washer of 2.
Remove looper link asm of 3.
Remove moving knife arm spring of
4.
Remove setscrews of 5 and remove
looper mas. asm.
Assembly
™ Attach looper mas. asm. and
tighten setscrews 5.
™ Hook moving knife arm spring
4.
™ Set looper link and attach E-ring,
washer, etc.
Point
™ Place looper 6 in the center 7
of inner hook and securely tighten
5.
See item 4 on page 23 for
adjustment of looper moving
amount.
7 Bobbin case
(Center of inner hook)
6 Looper
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