4. ADJUSTMENT
HE-800A
85
4-7. Adjusting the inner rotary hook and rotary hook holder overlap
Loosen the two screws (3) to adjust so that the tip of
the rotary hook holder (1) does not protrude past the
edge A of the inner rotary hook (2).
4-8. Adjusting the work clamp pressure
The standard distance A is 30 mm (approximately
30 N).
Loosen the nut (1) and turn the adjusting screw (2)
to adjust the work clamp pressure.
* When the adjusting screw (2) is tightened as far as
it will go, the work clamp pressure will be about 70
N.
4-9. Adjusting the work clamp lift amount
1. Turn on the power and set the sewing machine to the home position.
2. Check that memory switch No. 05 (work clamp height at neutral position) is set to 10 mm. (If it is not set to 10
mm, set it to 10 mm.)
3. Place a 10 mm gauge under the work clamp (1) and then loosen the set screw (2) to make the adjustment.
* Adjust the lift amount (including the play in the work clamp (1) and the pin (3) to 10 mm. If it is set to more than
10 mm, the work clamp will start lifting before lower thread trimming is complete, which may result in thread
trimming errors. Furthermore, it may also cause the presser foot lifter pulse motor to go out of step.
4298Q
3978Q
3977Q
4297Q
