Adjusting The Upper Thread Scissors Opening Timing - Brother HE-800A Service Manual
Electronic lockstitch button holer
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Also See for HE-800A:
- Manual del instrucción (122 pages) ,
- User manual (118 pages) ,
- Instruction manual (118 pages)
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4-14-8. Adjusting the upper thread scissors opening timing
4337Q
Approx. 1.0 - 1.5mm
4339Q
Center of the needle
4340Q
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".
Feed arm
Approx. 2mm
Approx. 1.0 - 1.5mm
HE-800A
4. ADJUSTMENT
Approx. 2mm
4338Q
Approx.
1.0 - 1.5mm
4341Q
95
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