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.
Relationship between knife position and eyelet shape
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Straight section
Knife
ac
bd
Cutting shape (a x b) | Eyelet shape (c x d) |
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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.
| Cutting shape | Eyelet shape (c X d) | |
| (a X b) | Cutting before | Cutting after |
Knife No. |
| sewing or no cutting | 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").
(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.
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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
Cutting space
48
