Download  Print this page

Adjusting The Upper Thread Scissors Opening Timing - Brother HE-800B Service Manual

Electronic direct drive lockstitch button holer.
Hide thumbs

Advertisement

7-12-8. Adjusting the upper thread scissors opening timing

1786B
Approx. 1.0 - 1.5 mm
1788B
1. Turn on the power and set the sewing machine to the home position. Then press the THREAD 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 the operation in test feed mode.
* Refer to the operating procedure given in "5-9. Upper thread trimmer mechanism".
Approx. 2 mm
Approx. 1.0 - 1.5 mm
Feed arm
HE-800B
7. ADJUSTMENT
1787B
Approx. 2 mm
Approx.
1.0 - 1.5 mm
102

Advertisement

Table of Contents

Troubleshooting

   Also See for Brother HE-800B

   Related Manuals for Brother HE-800B

Comments to this Manuals

Symbols: 0
Latest comments: