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Adjustment Procedures Results of Improper Adjustment
6) Thread trimmer cam timing
1. Loosen setscrews 4 in the thread trimmer cam which have
been temporarily tightened at "5) Thread trimmer cam".
2. Turn the handwheel to align the red engraved marker dot on
the handwheel with the engraved marker dot on the machine
arm.
3. Make thread trimmer cam 1 come in close contact with safety
clutch disk 2.
4. Make section R, start of entering cam groove, come in close
contact with cam roller B 3.
5. Securely tighten setscrews 4 in the thread trimmer cam.
(Caution) Check that the edge of thread trimmer cam 1 comes
in close contact with the edge of safety clutch disk 2.
When thread trimming timing is
retarded
™ Thread trimming action does not
complete even at the needle-up
stop position. As a result,
defective thread trimming will be
caused.
When thread trimming timing is
advanced
™ Defective thread trimming will be
caused.
™ Length of thread remaining on
the needle after thread trimming
cannot be secured and needle
thread may slip off after thread
trimming or at the start of
sewing.
™ Stitch skipping at the start of
sewing will be caused.
™ When the respective positions
are not correct, defective thread
trimming occurs.
7) Connectin the rocking arm and the thread trimmer roller arm
1. Loosen setscrews 1 in the thread trimmer shaft connecting
plate.
2. Make rocking arm 2 come in close contact with thread trimmer
stopper 3.
3. Make cam roller A 4 come in close contact with thread trimmer
driving plate 5.
4. Tighten setscrews 1 in the thread trimmer shaft connecting
plate.
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