Automatic sewing machine

Details Automatic sewing machine Automatic sewing machine

1980-11-10

1983-06-21

Nerbun, Peter P.

Sewing

Special machines

Darning

112220, 1122621, D05B 2100

Patent

active

043888828

ABSTRACT:
An automatic sewing machine having an improved drive speed control system. Many stitch instructions each indicating the relative position between a vertically reciprocated needle and a workpiece are stored in a memory in a predetermined sequence. The large number of stitch instructions are divided into a plurality of groups consisting of a predetermined number of consecutive stitch instructions. For each group, a maximum permissible speed is determined in accordance with the variations of the relative position between the needle and the workpiece directed by the instructions of the group. This maximum permissible speed causes formation of an exact stitch pattern in the workpiece according to the stitch instructions in each of the groups. A speed control device controls the speed of the drive motor in accordance with the various maximum permissible speeds. This causes sewing to be performed in a highly effective and exact manner.

REFERENCES:
patent: 4164192 (1979-08-01), Herr et al.
patent: 4221176 (1980-09-01), Besore et al.

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