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Adjusting The Clearance Between Needle And Hook Tip; Adjusting The Inner Rotary Hook And Rotary Hook Holder Overlap; Adjusting The Work Clamp Pressure - Brother HE-800B Service Manual

Electronic direct drive lockstitch button holer.
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7. ADJUSTMENT

7-4-1. Adjusting the clearance between needle and hook tip

2839Q
1. Press the THREAD key to switch to threading mode.
2. Press the
key.
3. Gently tilt back the machine head.
4. Loosen the screws (3) and move the rotary hook (4) forward or back until there is a clearance of 0.01 – 0.08 mm between the
needle (1) and the hook tip (2).
5. Gently return the machine head to its original position.
6. Press the THREAD key.

7-5. Adjusting the inner rotary hook and rotary hook holder overlap

7-6. Adjusting the work clamp pressure

91
0.01 – 0.08 mm
1. Gently tilt back the machine head.
2. 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).
3. Gently return the machine head to its original position.
3977Q
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.
3978Q
HE-800B
4884M

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