Fine Adjustment Of Knife Position - Brother RH-981A Service Manual

4-9. Fine adjustment of knife position

Before this adjustment, make sure that adjustment in "4-7. Adjusting 0 position (reference line) of the needle" has
been completed.
The knife position should be adjusted so that it can correctly cut the eyelet button hole which is formed by the portion
where the needle will penetrate at the inside position and round the eyelet.
The back and forth and sideways movement, and inclination of the knife position can be independently adjusted.
1. Use a short needle (for adjustment).
2. Set the air pressure of the regulator under the table to 0.2 – 0.3 MPa.
* This is to protect the hammer from being damaged by the knife after the knife position is adjusted.
3. Press the AFTER key on the operation panel to set cutting after sewing.
4. Place a sheet of paper under the work clamp, and turn the pulley to trace where the needle will penetrate for an
eyelet button hole on the paper.
5. Make sure that the portion where the needle penetrates for the eyelet button hole uniformly overlaps the knife
cutting positions.
* For easier checking, change the value for cutting space by the parameter settings.
6. If it is not, turn off the power, and adjust the position of the knife.
[Back and forth movement adjustment]
Loosen the bolt (2), and adjust the position of the knife
by following the block stopper plate (1) as a guide.
After adjustment, loosen the screw (3), and press the
block stopper plate (1) against the knife.
3789Q
[Sideways movement adjustment]
1. Loosen the bolts (1), (2), and (3), of the knife bracket.
2. Loosen the bolts (4) and (5) of the knife bracket
guide.
3. Turn the adjusting screw (6). Fine adjustment for
sideways movement of the knife can be performed
without removing the knife bracket and the knife
bracket guide.
[Inclination adjustment]
1. Loosen the bolts (1), (2), and (3), of the knife bracket.
2. Loosen the bolt (7), which secures the knife bracket
and the knife bracket guide.
3. Turn the adjusting screw (6). Inclination of the knife
can be adjusted by rotating the knife bracket and the
knife bracket guide, regarding the pivot (8) as the
center.
3790Q
RH-981A
4. ADJUSTMENT
54