1. Counter knife position
Loosen the counter knife set screw
to adjust the position.
2. Moving knife position
Loosen the screw
to adjust the position.
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.
– 34 –
1. Turn off the power supply and look for any close contact between the
AT solenoid
and the thrust collar
.
2. Loosen the three set screws
and remove the thread tension cap
.
3. Hold the tension releasing pin adjust collar
not to let it rotate, and
loosen the nut
.
4. Turn the tension releasing pin adjust collar
and adjust the gap
between the thread tension disk
. (Adjustment of thread tension
disc floating)
5. Hold the tension releasing pin adjust collar
and tighten the nut
.
Mount the thread tension cap
by means of the set screw
.
6. Turn on the power supply and set up the thread tension. Confirm that
the thread tension disk
are closed.
(Caution) When the tension releasing pin adjusting collar
is
rotated, the thread section should not be engaged with
the incomplete thread section of the thread tension re-
leasing pin
. (The thrusting distance of the thread ten-
sion releasing pin
should be 4 mm or less from the
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 set screw
and adjust the
AT link unit (front) in the right-left direction.
Refer to “(22) AT unit connection/disconnection”.
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
, the thread
tension releasing pin
may be
damaged.
Adjustment Procedures
Results of Improper Adjustment
Adjustment Procedures
Results of Improper Adjustment