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7. Reverse feed stitch lever
Preparation
™ Remove belt cover.
8. Idler
Preparation
™ Remove belt cover.
Disassembly
™ Remove 1 setscrew and remove
idler asm.
Assembly
™ Assemble idler and tighten it with
1 setscrew.
™ 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 2
convex portion to the left or right.
Disassembly
™ Remove 1 spring from arm.
™ Remove two 2 setscrews.
™ Remove 4 lever arm from the slot
of 5 regulator when removing 3.
Assembly
™ Attach 3 lever and set with 2
setscrews.
™ Hook lever spring 1 to lever arm
4.
Point
™ Set 4 lever arm to the slot of 5
regulator.
Disassembly
™ Loosen 1 setscrew.
™ Loosen two 2 setscrews.
™ Draw out thread 3 take-up
supporting shaft.
™ Remove 5 and 6 together with
4 needle bar crank.
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 1
setscrew.
Point
™ Tighten setting portion (flat
portion) of needle bar crank with
screw No. 1.
™ Press 3 shaft to frame side while
viewing the torque and tighten 1
setscrew.
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
2 Needle bar
crank setscrew
5 Thread take-up
1 Thread take-up supporting shaft setscrew
SM8050602TP
3 Thread take-up
supporting shaft
4 Needle bar crank
6 Thread take-up
support
3 Reverse feed stitch
lever mas. asm.
2 Reverse feed stitch lever
setscrew SM5040855SN
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