Needle And Knife Position - Brother DH4-B981 Instruction Manual

7. SEWING

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.
7-4-1. Relationship between knife position and eyelet shape
a
Cutting shape (a x b)
(When cutting before sewing)
7-4-2. 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
46
Straight section
Knife
c
b
d
Eyelet shape (c x d)
(When cutting after sewing)
1. When cutting before sewing, the inside needle down
0936Q
1. position must be aligned accurately with the straight
1. line section of the eyelet (when the cutting space H is
1. 0).
1. This is set correctly at the time of shipment from the
1. factory.
2. The shape of the eyelet is automatically changed
2. according to the shape of the knife for cutting before
2. and after sewing and for no cutting.
Cutting shape
Knife No. (a x b)
2.1 x 3.2
1
2.8 x 4.3
2
3.0 x 4.6
3
4 3.2 x 5.4
5
Straight
3. At the time of shipment, the installation position for the
0937Q
3. knife is adjusted to the position shown in the illustration
3. at left (when the cutting space value is "0").
1. When cutting after sewing, set the cutting space to an
0938Q
1. appropriate value so that the seam is not cut by the
1. knife.
1. * The cutting space should generally be set to around
1. * 0.2. (Refer to page 36 for details on the setting
1. * method.)
DH4-B981
Eyelet shape (c x d)
Cutti n g before sewi n g or no cutti n g
Cutting after sewing
1.7 x 2.7 2.5 x 3.8
2.4 x 3.9 3.2 x 4.9
2.6 x 4.1 3.4 x 5.2
2.8 x 4.7 3.6 x 6.1
Straight Straight