– 49 –
1. Tilt the machine head and support the head at that position, using
the head support bar.
2. Move the moving knife
forward by hand until it will go no further.
(While turning the hand-wheel
by hand, draw the moving knife
forward from its initial position, and the moving knife
will move).
3. Put a thread (Tetron #8) into the thread eyelet of the moving knife
. (The thread should be held slack until the thread has been
trimmed).
4. Turn the hand-wheel
slowly by hand in the normal direction of
rotation.
5. The moving knife
engages with the counter knife and the thread
is trimmed. Then, stop turning the hand-wheel
.
6. Turn the hand-wheel
slightly from the position described in step
5. in the reverse direction of rotation. Turn it to the extent where the
thread trimmer cam
does not come in contact with the thread
trimmer cam roller
.
7. Loosen the set screws (3 pcs.)
of the thread trimmer cam
.
8. While securing the thread trimmer cam
by hand so that it does
not come in contact with the moving knife driving arm A
, turn the
hand-wheel
until the hand-wheel pointer meets the graduation
[D] on the hand-wheel.
9. In the state described in step 8. turn the thread trimmer cam
until
it slightly comes in contact with the thread trimmer cam roller
of
the moving knife driving arm A
.
10. Fasten the set screw
of the thread trimmer cam
.
11. Make sure that the timing of thread trimming action has been prop-
erly adjusted. Repeat steps 3. and 4. and perform thread trimming.
Now, check that the hand-wheel pointer meets the graduation [D]
on the hand-wheel: they will meet if the timing of thread trimming
action has been properly adjusted.
Adjustment Procedure
Results of Improper Adjustment
o If the timing of thread trimming is
too early:
• The length of thread remaining
at the needle after thread trim-
ming will be insufficient. As a re-
sult, the thread may slip out of
the needle eyelet at the sewing
start or after thread trimming.
• Stitch skipping may occur at the
start of sewing.
o If the timing of thread trimming is
to late:
• Thread trimming failure may be
caused.
8’ For the marker dot engraved on
the hand-wheel, refer to [3.-(1)
Types and Names of Gradua-
tions on the Hand-wheel].
