4) Relationship between Needle and Hook
① Adjusting Timing between Needle and Hook
Default timing of the needle and the hook is set by the main shaft angle of 201°and varies as below.
② Adjusting Gap between Needle and Hook Point
5-16
• Gap between the hook point and the scarf of the needle
should be 0.1-0.3 mm minimum.
• Thread skip occurs due to thread looping or inadequate
balance/gap between the needle and the hook. The closer the
hook point is to the needle, the hook point will be inside the
loop and threading will be more stable.
[Fig.5-23]
[Fig.5-25]
Hook point
0.1~0.3mm
[Fig.5-24]
Top edge of
needle eye
Top point of hook
circumference
Needle tip
Top edge of the
needle eye
Hook allowance
(gap)
Hook
point
Lower dead stop
of the needle
Hook point
a. At lower dead stop of the needle bar
2.3~3.7 mm
1.8~2.2 mm
0.5~1.5 mm
The figures may change according
to needle specification/number.
b. At needle-hook timing
c. At needle-hook timing
[CAUTION]
The hook can move right and left if there is an allowance
in the lower shaft gear. Eliminate the allowance (gap) by
turning the hook clockwise. Then adjust the timing.
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