JUKI LU-2210N-7 Engineer's Manual page 55

Adjustment Procedure
1. Tilt the machine head and support the head at that position, using
the head support bar.
2. Move the moving knife
(While turning the hand-wheel
forward from its initial position, and the moving knife
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
rotation.
5. The moving knife
is trimmed. Then, stop turning the hand-wheel
6. Turn the hand-wheel
5. in the reverse direction of rotation. Turn it to the extent where the
thread trimmer cam
trimmer cam roller
7. Loosen the set screws (3 pcs.)
8. While securing the thread trimmer cam
not come in contact with the moving knife driving arm A
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
it slightly comes in contact with the thread trimmer cam roller
the moving knife driving arm A
10. Fasten the set screw
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.
forward by hand until it will go no further.
by hand, draw the moving knife
slowly by hand in the normal direction of
engages with the counter knife and the thread
slightly from the position described in step
does not come in contact with the thread
.
of the thread trimmer cam
by hand so that it does
.
of the thread trimmer cam
Results of Improper Adjustment
o If the timing of thread trimming is
will move).
o If the timing of thread trimming is
.
8' For the marker dot engraved on
.
, turn the
until
of
.
– 49 –
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.
to late:
• Thread trimming failure may be
caused.
the hand-wheel, refer to [3.-(1)
Types and Names of Gradua-
tions on the Hand-wheel].