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Adjustment Procedures
Results of Improper Adjustment
Adjustment Procedures
Results of Improper Adjustment
1) Loosen nut
3
in the knife driving arm, and adjust the initial
position of the moving knife.
Loosen/tighten nut
3
after roller has fitted in the groove on
the thread trimming cam by pressing roller arm
6
with fingers.
This will prevent knife driving arm
7
from moving out of position
thereby allowing you to perform the adjustment in safety.
2) After adjusting the initial position of the moving knife, turn the
handwheel in the state that roller
4
has fitted in the groove on
the thread trimming cam, and check that the latch has securely
entered when the moving knife moves forward or backward
until it will go no further. (You can hear “click” when the latch
has entered.)
™
If the initial position of the moving
knife is not properly adjusted, the
moving knife will fail to cut the
thread or cut the thread at a
wrong position reducing the
length of remaining thread after
thread trimming.
™
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.
™
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 the roller fits in the groove on the cam.
Lightly push the cam on the pulley side and turn it in the reverse
direction until it will go no further. Now, tighten the screws.
