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Adjustment Procedures
1. Counter knife position
Loosen the counter knife setscrew
2. Moving knife position
Loosen the screw
Adjustment Procedures
1. Turn off the power supply and look for any close contact between the
AT solenoid
and the thrust collar
2. Loosen the three setscrews
.
3. Hold the tension releasing pin adjust collar
loosen the nut
.
4. Turn the tension releasing pin adjust collar
between the thread tension disk
disc floating)
5. Hold the tension releasing pin adjust collar
Mount the thread tension cap
6. Turn on the power supply and set up the thread tension. Confirm that
the thread tension disk
(Caution) When the tension releasing pin adjusting collar
rotated, the thread section should not be engaged with
the incomplete thread section of the thread tension re-
leasing pin
sion releasing pin
tension releasing pin adjusting collar
* If the amount of disc floating cannot be adjusted prop-
erly under the condition that the thrusting distance is
4 mm or less, loosen the setscrew
AT link unit (front) in the right-left direction.
Refer to "(25) AT unit connection/disconnection".
to adjust the position.
to adjust the position.
.
and remove the thread tension cap
. (Adjustment of thread tension
by means of the setscrew
are closed.
. (The thrusting distance of the thread ten-
should be 4 mm or less from the
not to let it rotate, and
and adjust the gap
and tighten the nut
.
.
is
.)
and adjust the
– 37 –
Results of Improper Adjustment
o If the clearance is less than
1.0mm, thread may be cut by the
counter knife
blade when the
thread is pulled with the moving
knife
. In this case, upper and
lower threads are cut into short
pieces.
o If the clearance is more than
1.0mm, the residual thread length
after thread cutting operation be-
comes longer beneath the work.
Results of Improper Adjustment
o If the amount of disc floating is too
less, the residual thread length
can be changed or shortened
when the thread is thick.
o If the amount of disc floating is too
much, the thread tension discs
cannot close completely and nor-
mal thread tension may fail to be
chosen. This can be a cause of
imperfect sewing.
o If the thread section of the tension
releasing pin adjusting collar
is engaged with the incomplete
thread section of the thread ten-
sion releasing pin
tension releasing pin
damaged.
, the thread
may be
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