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7. SEWING
RH-981A
48
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
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 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.
Eyelet shape (c X d)
Knife No.
Cutting shape
(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 3.8 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
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 value is
"0").
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.
When cutting after sewing, set the cutting space to an
appropriate value so that the seam is not cut by the
knife.
* The cutting space should generally be set to around
0.2. (Refer to “6-3 Program setting method.”)
0937Q
(When cutting before sewing)
(When cutting after sewing)
0938Q
Cutting space
0936Q
Straight section
ca
b
d
Knife
Eyelet shape (c x d)
Cutting shape (a x b)