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Adjustment Procedures Results of Improper Adjustment
1. Loosen setscrew ① in the driving arm.
2. Loosen setscrews ② in the moving knife shaft thrust collar.
3. Adjust so that a clearance of 0.3 to 0.4 mm is provided
between the bottom end of moving knife ③ and inner hook
④ and tighten the setscrews in the thrust collar.
4. Tighten the setscrew in the driving arm so that there is no
thrust play at the moving knife shaft.
1. Loosen setscrews ① in the moving knife.
2. Adjust the installing position of the moving knife so that the
position where moving knife ② starts to come in contact with
counter knife ③ starts to come in contact with each other at
the position of 5.5 to 6.5 mm from the top end of the moving
knife.
3. Tighten the setscrews.
(Caution) • Operate the sewing machine with the knife
pressure minimized to such an extent that both
needle and bobbin threads can be trimmed.
◯ Initial position
• When the moving knife travels to its back end, the distance
between the top end of the counter knife and the top end of
the moving knife is 0.5 ± 0.2 mm.
(Check)
• At this time, check that driving arm ④ comes in close contact
with thread trimmer stopper plate ⑤ .
● When the clearance is large :
• Defective clamp of needle and
bobbin threads will occur.
● When the clearance is small :
• Moving knife interferes with the
inner hook.
• There is no clearance for the
thread to enter between the
moving knife and the inner hook
resulting in defective thread
trimming.
● When the knife pressure is high :
• Blade sections of the counter knife
and the moving knife may be
damaged.
• Torque at the time of thread
trimming is increased resulting in
motor-stop.
•Defective thread trimming
operation will result.
● When the knife pressure is low :
• Defective thread trimming will
result.
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