–
25
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3. Thread trimmer cam timing (Needle-to-cam position)
○ Loosen setscrews in
❶
thread trimmer auxiliary
cam,
❷
thread trimmer cam and
❸
roller holding
cam.
○ Lower needle bar by 37˚ (1.95 mm) from its upper
dead point.
○ In this state, fix hook driving shaft and perform
positioning of cams of
❶
,
❷
and
❸
.
3-1 Positioning of [thread trimmer auxiliary cam]
○ Make shaft at top end of
❹
thread trimmer auxil-
iary link of solenoid asm. come in contact with
❶
thread trimmer auxiliary cam and tighten it with
setscrew.
3-2 Positioning of [thread trimmer cam]
○ Face front
❺
setscrew No. 1 in thread trimmer
cam.
○ Enter
❻
thread trimmer cam contactor shaft to
groove in
❷
thread trimmer cam.
○ Slightly pressing thread trimmer cam to hand-
wheel side, turn it in reverse direction.
○ Tighten thread trimmer cam with setscrews at
place where idling term of cam groove (place
where rotation is hindered) is nished.
3-3 Positioning of [roller holding cam]
○ Turn pin of link support plate and make it come in
contact with concave portion of
❸
roller holding
cam.
○ For lateral position, make
❸
roller holding cam
come in contact with
❶
thread trimmer auxiliary
cam and tighten it with setscrew.
3-4 Securely tighten setscrews in respective cams
❷
Thread trimmer cam
❹
Thread trimmer auxiliary link
❶
Thread trimmer auxiliary cam
❺
Setscrew No. 1
Setscrew No. 2
❸
Roller holding cam
Link support plate
Convex portion
❻
Thread trimmer cam
contactor shaft
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