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7. Reverse feed stitch lever
Preparation
™ Remove belt cover.
(Remove motor cover.
™ Remove motor mas. asm. )
8. Idler
Preparation
™ Remove belt cover.
™ Remove motor cover.
™ Remove motor mas. asm.
Disassembly
Remove setscrew of 1 and remove
idler asm.
Assembly
™ Assemble idler and tighten it with
setscrew 1.
™ Belt tension : Belt sags 6 to 7 mm
when center of the belt is applied
with a 1.96N load.
Point
™ Belt tension can be changed only
by removing belt cover. Move
convex portion of 2 to the left or
right.
Disassembly
Remove spring of 1 from arm.
Remove two setscrews of 2.
Remove lever arm 4 from the slot of
regulator 5 when removing 3.
Assembly
™ Attach lever 3 and set with
setscrews 2.
™ Hook lever spring 1 to lever arm
4.
Point
™ Set lever arm 4 to the slot of
regulator 5.
Disassembly
Loosen setscrew of 1.
Loosen two setscrews of 2.
Draw out thread take-up supporting
shaft 3.
Remove 5 and 6 together with
needle bar crank of 4.
Assembly
™ Set needle bar crank to thread
take-up, attach it onto main unit
and tighten setscrews (2 pcs.).
™ Set 6 to 5, enter thread take-up
supporting shaft 3 to 6, attach it
onto frame and tighten setscrew
1.
Point
™ Tighten setting portion (flat
portion) of needle bar crank with
screw No. 1.
™ Press shaft 3 to frame side while
viewing the torque and tighten
setscrew 1.
6. Thread take-up
Preparation
™ Remove arm cover asm.
™ Remove face plate mas. asm.
™ Remove presser bar.
™ Remove needle bar.
2 Convex portion of idler installing plate
1 Idler setscrew
SM5040855SN
5 Feed regulator
1 Reverse feed
stitch lever spring
4 Reverse feed
stitch lever arm
3 Reverse feed stitch
lever mas. asm.
2 Reverse feed stitch lever setscrew SM5040855SN
2 Needle bar
crank setscrew
5 Thread take-up
1 Thread take-up
supporting
shaft setscrew
SM8050602TP
6 Thread take-up
support
3 Thread take-up supporting shaft
4 Needle
bar crank
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