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Adjustment Procedure
9) Installation of thread spreading plate
1. Set the thread spreader ❶ to fit the groove on machine bed in
the direction of the figure, temporarily fix it using the setscrew
❷.
2. Adjust the position of thread spreader ❶ so that the clearance
between the bending portion of thread spreader ❶ and the
largest diameter of the outer periphery of the hook ❻ becomes
0.3 to 1.0 mm (at the smallest clearance position when rotating
the hook ❻: approximately 17.9 to 19.1 mm). Then, tighten
setscrew ❷. (Tightening torque : 1.96 to 2.94 N·m)
(Caution) The distance between the left end of the tip of the
thread spreading knife ❺ and the left end of the
thread spreader ❶ shall be in the range between 0 mm
and 0.5 mm.
3. Make sure that there is no interference by rotating the hook ❻.
Make sure that the thread spreading knife ❺ enters between
the thread trimming knife
rotating the thread spreading knife ❺.
(Caution) 1. The outer periphery of the hook ❻ is not uniform.
So adjust at the smallest clearance position.
2. When making an adjustment or checking the
clearance, conduct the work with the throat plate
detached.
3. Secure the inner hook holder ❼ first, and then
adjust the thread spreader ❶.
❹
and the thread spreader ❶ by
– 60 –
Results of Improper Adjustment
○ If the clearance is too small, the
hook ❻ interferes with the thread
spreader ❶. As a result, noise and
scratching to the hook may occur.
Also, the needle thread may be
caught causing insufficient tight-
ness of the needle thread.
○ If the clearance is too large, a
thread spreading failure may occur
at the time of thread trimming.
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