7. ADJUSTMENT
7-15. Adjusting the tension release amount
11.5mm
(2)
4688Q
4689Q
1.
Loosen the nut (4) and
tum
the bolt (2) to adjust
so
that the distance between the tip
of
the bolt (2) and the solenoid
setting
plate (3) is 11.5 mm when the plunger
of
the tension release solenoid (1) is pushed in as far as it will go.
2. Check that the tension disc opening amount is
1.0-
1.5
mm
when the tension release solenoid (1) is installed to the arm
and the plunger is pushed with a screwdriver
or
similar tool through the hole in the solenoid cover.
• When memory switch No.
551
is
set to "ON", the tension release will operate to reduce instances
of
the thread pulling
out
at the sewing start.
•
If
memory switch No. 552 has been set so that the tension release timing is early, you can increase the trailing length for
the upper thread.
7-16. Adjusting the backlash
of
the lower shaft gear
0.05-0.15
mm
(1)
4690Q
4691Q
1.
Loosen the
set
screw
(1
),
and move the rock
gear
(2) to the left and right so that the pulley can rotate easily.
2. Tum the rock
gear
shaft (3) to adjust the play at the end
of
the driver (4) to
0.05-
0.15 mm, and tighten the set screw
(1
).
KE-4300,
BE-4380
73
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