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3. Thread trimmer cam timing (Needle-to-cam position)
1. Loosen two setscrews in thread trimmer cam.
2. Raise machine and lower needle bar by 1.93 mm from its upper dead point.
3. Tilt machine horizontally and face setscrew No. 1 1 of thread trimmer cam to front.
(Setscrew No. 1 ..... Screw that comes first when turning handwheel in normal direction.)
4. Enter thread trimmer cam contact shaft 2 to groove in thread trimmer cam.
5. Slightly prees thread trimmer cam to handwheel side, turn it in right direction as viewed from face plate side,
and tighten setscrew No. 1 at the position where thread trimmer cam 3 comes in contact with thread trimmer
roller with a click.
6. Securely tighten thread trimmer cam setscrews in the order of setscrew No. 2 and No. 1.
3 Thread trimmer cam
1 Setscrew No. 1
Tighten setscrew when thread
trimmer cam contact shaft
comes in contact with this
position.
2 Thread trimmer
cam contact shaft
Moving knife roller
arm shaft asm.
(Upper stop angle 37˚)
Throat plate
1.93 mm from
upper dead point
Needle (HA x #14)
52.57 mm
(13.77 mm)
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