7. STANDARD ADJUSTMENTS
BAS-326H-484, BAS-326H-484 SF
38
7-7. Adjusting the thread take-up amount
At the time of shipment from the factory, the thread take-up amount (stroke) of the thread take-up lever (1) is adjusted to the
standard amount of 5 mm. Adjust this amount according to the sewing conditions to prevent the thread from pulling out at
the sewing start.
Adjustment method
Loosen the pre-tension nut (2), and then turn the stopper (socket bolt) (3) to adjust the extension position of the thread
take-up cylinder (4).
* If you would like to reduce the upper thread trailing amount, tighten the stopper (3).
* If you would like to increase the upper thread trailing amount, loosen the stopper (3).
NOTE:
If you make the stroke of the thread take-up lever (1) to be shorter than necessary, it will cause the upper thread trailing
length to become too short and the thread will pull out.
In addition, if the stroke is made to be longer than necessary, it will cause the upper thread trailing length to become too
long, and the thread will become tangled on the underside of the material being sewn, creating an untidy finish.
7-8. Adjusting the clearance between the inner hook and the hook
stopper
Loosen the two screws (3) and move the hook stopper setting base (4) to adjust so that the tip of the hook stopper (1) is
approximately 0.8 mm away from the needle drop surface of the inner hook (2).
4689M
3718B
Thread take-up
amount (stroke)
Less thread
More thread
4690M
Approx. 0.8 mm
Approx.
0.8 mm
