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Adjustment Procedures
If the timing of the thread trimming cam is not correct, adjust it in
the following steps of procedure.
1) Loosen two screws 5 in the cam.
2) Turn the main shaft handwheel until the red marker dot
engraved on the handwheel is aligned with the marker dot
engraved on the machine arm.
3) Push roller arm 6 until roller 4 fits in the groove in thread
trimming cam 8. Lightly push thread trimming cam 8 on the
handwheel side and turn it in the reverse direction until it will
go no further. Now, tighten two screws 5 in the cam.
Adjustment Procedures
1) Loosen screw 1 and remove fixing plate 2.
2) Remove screw 3, and the knife unit will come off.
Installation is carried out analogously in reverse order.
(Caution) When installing the knife unit, take care to allow
pin 5 of moving knife (asm.) 4 to securely rest on knife
yoke (asm.) 6.
Adjustment Procedures
1) Stop the needle in its upper stop position. Loosen screw A in
the figure and adjust the stop position of the needle by moving
the screw within the slot.
™ To advance the stop position a in the direction 1
™ To retard the stop position a in the direction 2
2) For the lower stop position of the needle, stop the needle in its
lower stop position, loosen screw B and adjust the stop position
within the slot.
(Caution)
1. Do not rotate the sewing machine with screws A and
B loosened during performing adjustment.
2. Be sure only to loosen screws A and B and not to
remove them.
3. Do not adjust needle DOWN stop screw B.
Results of Improper Adjustment
™ If the timing of the thread
trimming cam is excessively
advanced, the knife will fail to cut
the thread or the length of the
thread remaining after thread
trimming will be decreased
resulting in slip-off of the thread.
™ If the timing of the thread
trimming cam is excessively
retarded, the knife will fail to cut
the thread or the moving knife
will fail to fully return to the home
position making the moving knife
projects at the start of sewing.
Results of Improper Adjustment
Results of Improper Adjustment
™ When the stop position retards,
there is a possibility that wiper
interferes with needle in case of
with wiper.
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