Brother RH-9820, Service Manual, Page: 169 / 236

7. ADJUSTMENTS
RH-9820
160
NOTE: Relationship between needle drop position and eyelet pattern at the eyelet
When switching between cutting before sewing or no cutting
and cutting after sewing, the needle drop position at the inside
sewing position will change automatically in accordance with
the eyelet pattern as shown in the illustration.
Needle drop c x d
Knife
No.
Eyelet pattern
a x b
Cutting before
sewing or no cutting
Cutting after
sewing
1 2.1 x 3.2 1.7 x 2.7 2.5 x 3.8
2 2.8 x 4.3 2.4 x 3.9 3.2 x 4.9
3 3.0 x 4.6 2.6 x 4.1 3.4 x 5.2
4 3.2 x 5.4 2.8 x 4.9 3.6 x 6.0
5 Straight Straight Straight
6 3.8 x 4.3 3.4 x 3.8 4.2 x 4.9
Cutting before sewing Cutting after sewing
7-17. Adjusting the cutting pressure
Set the cutting pressure to the minimum pressure that still
allows the material to be cut.
* Set to between 0.1 - 0.6 MPa. (It is set to 0.4 MPa at the
time of shipment from the factory.)
<Adjustment method>
Turn the knob (1) of the hammer pressure adjustment
regulator on the underside of the table to adjust the air
pressure.
NOTE:
•
Do not increase the cutting pressure more than necessary.
If the pressure is too high, it will wear out the hammer and
damage the knife.
•
If the material cannot be cut cleanly, do not increase the
cutting pressure to too high a pressure.
Check the timing between the knife and the hammer.
(Refer to “7-13-2. Adjusting the contact between the knife
and the hammer”.)
0559B
Eyelet pattern a x b
Needle drop c x d
0469B