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Adjustment Procedures
™ Initial position of the waiting knife
1. Loosen two setscrews 1.
2. Set the stitch dial to "0".
3. Remove the air hose connecting to the regulator and cut off
the air.
4. Raising upward knife fixing plate 5, advance moving knife 6
and waiting knife 2 by hand.
5. Turn the handwheel in the state that cam roller 4 is located in
the groove of thread trimmer cam 3 and adjust the needle bar
to the upper dead point of its stroke.
6. Adjust thread trimmer cam 3 to the right or left so that the
distance from the distance from the top end of waiting knife 2
to the end of the machine bed is 21
cam 3 comes in close contact with cam roller 4.
Standard : Clearance provided between thread trimmer cam
3 and the hook driving shaft front bushing is
approximately 0.5 mm.
™ Cam timing
1. Make the end of the groove of thread trimmer cam 3 come in
close contact with cam roller 4 in the state that waiting knife
2 is in the most advanced position.
2. Align the red engraved marker dot on the handwheel with the
engraved marker dot on the machine arm.
3. Tighten two setscrews 1.
+ 0.4
mm when thread trimmer
- 0.2
– 35 –
Results of Improper Adjustment
When the distance from the top end
of waiting knife to the end of
machine bed is larger than the
specified value :
™ Thread trimming length on the
cloth side is lengthened.
When the distance from the top end
of waiting knife to the end of
machine bed is smaller than the
specified value :
™ Waiting knife base interferes
with the feed dog or the feed
base to cause the base to break.
When cam timing is excessively fast :
™ Cam roller does not enter the
thread trimmer cam. As a result,
machine lock will result.
When cam timing is excessively
slow :
™ Moving knife and waiting knife
do not return to the initial
positions. As a result, defective
clamp will be caused.
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