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Adjustment Procedures
Results of Improper Adjustment
1. Loosen setscrew
1
in the thread trimmer base.
2. Move thread trimmer base
2
so that the distance from moving
knife drive shaft
3
to the left end of the throat plate is 20 to
20.5 mm. Perform moving in the state that the end of thread
trimmer base
2
comes in close contact with the end of the
machine bed.
3. Tighten setscrew
1
in the thread trimmer base.
Confirmation
1. Set the stitch dial to “0”.
2. Remove the air hose connecting to the regulator and cut off
the air.
3. Raising upward knife fixing plate
4
, advance moving knife
5
and waiting knife
6
by hand.
4. Turn the handwheel in the state that cam roller
8
is located in
the groove of thread trimmer cam
7
and adjust the needle bar
to the upper dead point of its stroke.
5. Advance moving knife
5
and check that moving knife
5
does
not interfere with the inner hook.
6. Return moving knife
5
and waiting knife
6
to the respective
initial positions and connect the air hose to the regulator.
When the distance from the moving
knife drive shaft to the left end of
the throat plate is larger than the
specified value :
™
Failure of needle/bobbin threads
trimming will result.
™
Moving knife interferes with
needle to cause them to break.
When the distance from the moving
knife drive shaft to the left end of
the throat plate is smaller than the
specified value :
™
Defective clamp will result.
™
Moving knife interferes with the
inner hook to cause them to
break.
