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Adjustment Procedures Results of Improper Adjustment
1. Turn the handwheel to align the red engraved marker dot on
the handwheel with the engraved marker dot on the machine
arm.
2. Make thread trimmer cam ① come in close contact with safety
clutch disk ② .
3. In this state, make the section R where cam groove starts to
enter come in close contact with cam roller ③ .
4. Securely tighten setscrews ④ in the thread trimmer cam.
(Caution) • Check that the end face of the cam comes in
close contact with the end face of the safety
clutch disk.
1. Loosen setscrews ① in the thread trimmer shaft connecting
plate.
2. Make driving arm ② come in close contact with thread trimmer
stopper ③ .
3. In this state, make cam roller ④ come in close contact with
thread trimmer driving plate ⑤ .
4. Tighten the setscrews in the connecting plate.
● When the timing is retarded :
• Thread trimming action does not
complete even at the needle-up
stop position and thread is not
trimmed.
● When the timing is advanced :
• Defective thread trimming will
result.
• Length of tread remaining on the
needle after thread trimming
cannot be secured and needle
thread may slip off at the start of
sewing or after thread trimming.
• Stitch skipping at the start of
sewing will result.
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