– 6 –
2. Handwheel and clutch
Preparation
™ Remove belt cover.
™ Remove arm cover.
9 Motor pulley
6 Groove of
handwheel bushing
8 Handwheel bushing stopper pin
4 Angle portion of clutch spring
7 Convex of handwheel bushing
3 Groove of clutch spring support
!0 Groove of handwheel
3. Thread tensioner asm.
Disassembly
™ Remove 1 setscrew.
™ Remove cord guide plate
setscrew and remove cord guide
plate asm.
™ Remove 3 spring support.
™ Move 4 in the direction where
clutch spring is released and
remove clutch spring.
™ Face 6 to motor side and 8 is
hard to drop.
™ Draw out 8 and remove 9.
Assembly
™ Attach 9 and enter 8.
™ Enter 6 groove of bushing to 8
stopper pin and attach bushing.
™ Enter 5 hook portion of spring to
slit in the center of handwheel
bushing
™ Enter 5 clutch spring to 3 groove
of spring support and attach cord
guide plate asm. Then tighten
setscrew.
Point
™ Align 7 convex of bushing with
!0 groove of handwheel and
attach handwheel. Then tighten
setscrew.
™ Clearance provided between
convex of 3 clutch spring support
and clutch plate is 2 ± 0.5 mm.
™ See item 12 on page 19 for
adjustment.
1 Handwheel
setscrew
2 Handwheel
Disassembly
™ Remove 1 setscrew.
™ Lower presser foot and remove 2
setscrew.
™ Remove 3 spring together with
4 thread tensioner asm. and
adjusting plate.
Assembly
™ Attach 6 adjusting plate and 3
spring to thread tensioner asm.
and attach it to frame. Then fix it
with 2 setscrew.
™ Tighten 1 adjusting plate
setscrew.
Point
™ Place upward the scale of 5
thread tension disk presser.
™ See items 9 and 10 on page 19
for adjustment of pressure and
thread take-up spring of stroke.
1 Thread take-up spring
adjusting plate setscrew
SL5030801SN
2 Thread tensioner setscrew
SM8040602TP
3 Thread take-up spring
4 Thread tensioner asm.
5 Thread tension disk presser
5 Hook portion of clutch spring
6 Thread take-up
spring adjusting
plate
When removing motor
pulley, remove cord guide
plate setscrews 5 and 5-1
in previous item.
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