Needle And Knife Position - Brother RH-9800 Instruction Manual

7-4. Needle and knife position

The feed bracket is electronically controlled by means of pulse motors.
It is not necessary to change the position of the knife when switching between cutting before sewing and cutting after sewing.
It is not necessary to change the needle down position in order to keep enough space for cutting when cutting after
sewing has been selected.
Relationship between knife position and eyelet shape
a
b
Cutting shape (a X b)
(When cutting before sewing) (When cutting after sewing)
Explanation of the cutting space function
When cutting after sewing, this function moves the outer needle down positions in accordance with the knife shape so
that the seam is not cut by the knife.
Cutting space
0936Q
Straight section
Knife
c
d
Eyelet shape (c X d)
0937Q
0938Q
1. When cutting before sewing, the inside needle down
position must be aligned accurately with the straight
line section of the eyelet (when the cutting space H is
0).
This is set correctly at the time of shipment from the
factory.
2. The shape of the eyelet is automatically changed
according to the shape of the knife for cutting before
and after sewing and for no cutting.
Cutting shape
(a X b)
Knife No.
1 2.1 X 3.2
2 2.8 X 4.3
3 3.0 X 4.6
4 3.2 X 5.4
5 Straight
6 3.8 X 4.3
3. At the time of shipment, the installation position for the
knife is adjusted to the position shown in the
illustration at left (when the cutting space H and the
knife position compensation value I are "0").
1. When cutting after sewing, set the cutting space H to an
appropriate value so that the seam is not cut by the knife.
* The cutting space H should generally be set to
around 0.2 - 0.3. (Refer to page 24 for details on the
setting method.)
* The knife position compensation value I should be
set to "0".
Refer to "H. Setting the cutting space" and "I.
Setting the knife position compensation".
RH-9800
7. SEWING
Eyelet shape (c X d)
Cutting before sewing
Cutting after sewing
or off (no cutting)
1.9 X 2.8 2.4 X 3.9
2.4 X 3.9 3.3 X 4.6
3.2 X 4.1 3.6 X 4.8
2.8 X 4.7 3.6 X 6.1
Straight Straight
3.2 X 3.6 4.0 X 4.5
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