Sewing machine equipped for producing shaped seams

Details Sewing machine equipped for producing shaped seams Sewing machine equipped for producing shaped seams

1983-01-13

1985-01-29

Nerbun, Peter

Sewing

Special machines

Darning

112272, 112275, 112315, D05B 1900, D05B 2722

Patent

active

044958773

ABSTRACT:
A sewing machine for sewing shaped seams comprises equipment for exactly positioning an end stitch. By means of two edge sensing sensors provided one after the other in the feed direction, a pulse generator coupled to the main shaft, and a microprocessor, the difference between the desired feed length of the workpiece and the actual feed length thereof is determined. A microprocessor controls a step motor for adjusting a stitch setting device, the adjustment being a function of the difference between the desired and actual feed lengths of the workpiece and of the angular position of the main shaft at the instant of response of the second sensor. In this way, the length in excess of the last stitch which, without a correction, would extend beyond the predetermined end point, is uniformly distributed among the last stitches of the seam, while at the same time taking into account slippage between the feed dog and the workpiece.

REFERENCES:
patent: 4381719 (1983-05-01), Goldbeck
patent: 4403558 (1983-09-01), Martell et al.
patent: 4404919 (1983-09-01), Martell et al.

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