– 45 –
Height of the Moving Knife (for the right-hand side hook)
1. Disconnect the lead wire
of the thread trimmer solenoid
from
the terminal board
.
2. Loosen the clamping screw in the hook driving shaft set collar.
3. Disconnect the urethane tubes
from the tube connecting screws
of the hook driving shaft saddle.
4. Loosen the hook driving shaft saddle set screw and remove the
hook driving shaft saddle.
5. Loosen the thrust collar set screws
for the moving knife
.
6. Loosen the set screw
of the moving knife driving arm A
.
7. Loosen the set screw
of the moving knife driving arm B
.
8. Adjust so that a clearance of 0.4 to 0.5 mm is provided between the
moving knife
and the inner hook
by moving the moving knife
shaft
up and down. (For LU-2210N/W and LU-2260N/W)
9. Fasten the moving knife thrust collar set screw
.
10. Adjust the moving knife driving arm A
and fasten the set screw
. (Refer to [3.-(10)-4 Moving Knife Driving Arms A, B and C]).
11. Adjust the moving knife driving arm B
and fasten the set screw
. (Refer to [3.-(10)-4 Moving Knife Driving Arms A, B and C]).
12. Temporarily fix the hook driving shaft saddle.
13. Connect the lead wire
of the thread trimmer solenoid
to the
terminal board
.
14. Connect the urethane tubes
to the tube connecting screws
of
the hook shaft saddle. At the same time, use the tube connecting
screws
to which the urethane tubes
had been connected be-
fore removing it.
15. Adjust the clearance between the needle and the blade point of the
hook.
(Refer to [3.-(4)-2) Clearance between the Needle and the Blade
Point of the Hook]).
16. Adjust the needle-to-hook timing. (Refer to [3.-(4)-3) Timing between
the Needle and the Hook]).
o If the clearance between the
moving knife and the bobbin case
is too large:
• The needle thread and bobbin
thread may fail to be caught by
the moving knife.
o If the clearance between the mov-
ing knife and the bobbin case is
too small:
• The moving knife
may inter-
fere with the bobbin.
• Widen the space in the hook
driving shaft coupling, then re-
move the hook driving shaft
saddle.
o In the case of LU-2212N-7:
8’ Adjust so that the clearance of
0.3 to 0.4 mm is provided be-
tween the moving knife
and
the inner hook
by moving the
moving knife shaft
up and
down.
13’Give the lead wire
a clockwise
turn and connect it to the termi-
nal board
while routing it along
the back of the solenoid
. At
that time, take care not to allow
the lead to come in contact with
the plunger shaft
.
Adjustment Procedure
Results of Improper Adjustment
