4. ADJUSTMENT
HE-800A
95
4-14-8. Adjusting the upper thread scissors opening timing
1. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the
work clamp.
2. Loosen the two bolts (3), and then adjust the support plate (4) so that the back plate (1) and the cam (2) overlap
by approximately 1.0 – 1.5 mm.
Note: If the amount of overlap is too small, the upper thread scissors will not open properly and the upper
thread scissors and the cutter may touch each other.
3. Loosen the two bolts (5), and then adjust the clearance between the bend in the back plate (1) and the cam (2)
to approximately 2 mm.
* If you would like the scissors to start opening earlier, make this clearance smaller.
4. Check that the distance A between the upper thread scissors (6) and the center of the needle is 5.5 - 6 mm.
5. If the distance A is outside the range of 5.5 – 6.0 mm, loosen the two screws (7) and move the dog (8) in the
direction of the arrow slightly, and then tighten the screws (7).
6. Turn the power back on, set the sewing machine to the home position and then press the RESET key to check
the distance A.
7. Check the operation in test feed mode.
* Refer to the operating procedure given in “1-10. Upper thread trimmer mechanism”.
4338Q4337Q
4339Q
4341Q4340Q
Approx. 2mm
Approx. 1.0 - 1.5mm
Approx. 2mm
Feed arm
Approx.
1.0 - 1.5mm
Approx. 1.0 - 1.5mm
Center of the needle
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