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Adjustment Procedures Results of Improper Adjustment
1. Turn the alternate vertical dial to adjust the scale “1” to the
convex section on the top cover.
2. Loosen setscrew 1 in the alternate vertical dial and remove
the alternate vertical dial.
At this time, be careful that a pin and a spring are in the hole of
section A.
3. Loosen installing screws 2 of the detection switch of the amount
of alternate vertical movement and adjust the distance from
the inner diameter of the bushing to the edge of the switch
body to 8 ± 0.1 mm. Then tighten installing screws 2.
4. Adjust the scale “1” to the convex section on the top cover,
place the pin and the spring in the hole of section A, install the
alternate vertical dial and tighten setscrew 1 in the alternate
vertical dial.
(Caution) When the position of the detection switch of the
amount of alternate vertical movement is changed, check
whether the relation between the alternate vertical dial and
the sewing speed is normal.
™ Sewing speed may not change
even when turning the alternate
vertical dial.
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 thrust
pad 2.
3. In this state, make the R section come in close contact with
thread trimmer cam roller 3 at the position where the cam
groove starts.
4. Securely tighten setscrews 4 in the thread trimmer cam.
(Caution) Make sure that the edge of thread trimmer cam 1
comes in close contact with the edge of thrust pad 2.
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 needle thread remaining
on the needle after thread trimming
is not 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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