8-7. Adjusting the timing between the needle and the hook
After setting the needle bar height, set stitch length to
minimum, turn the machine pulley toward you until the
needle bar reaches its lowest point. Continue turning and
allow the needle bar to raise about 2mm while on its up-
ward stroke. With needle bar in this position, the point of
the sewing hook should be at the center of the needle,
and normally,the measurement between the hook point
and the upper end of the needle eye should be 2.4mm,
further the clearance between the hook point and the
needle hollow should be about 0.02 to 0.1 mm.
2.4mm
O.02-0.1mm
8. STANDARD ADJUSTMENTS
.,
• Adjusting the timing
1. Loosen the three set screws O.
2. Turn the hook shaft f)to align the hook point with
the center of the needle.
3. Tighten the three set screws
0 and re-check the
timing of the sewing hook .
*
If they are not measured as above, perform the
adjustments below .
o
-'\
F'~1)\
• Adjusting the clearance
1. Loosen the two screws. slightly.
2. Move the hook. to the right or to the left as may
require.
* Please note one of the two screws" is placed
on the V ditch of hook shaft. Therefore, keep
the screw on V ditch during adjustment.
3. Tighten the two screws
e.
- 18 -
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