Sewing machine for performing pattern-correct sewing

Details Sewing machine for performing pattern-correct sewing Sewing machine for performing pattern-correct sewing

1987-02-13

1988-10-18

Nerbun, Peter

Sewing

Stitch forming

Feeding work material

11212111, 112320, D05B 2706, D05B 2708

Patent

active

047778962

ABSTRACT:
Before sewing, a cloth pattern sensing means generates waveform signal corresponding to the overall width of two overlapping patterns corresponding to each other in two cloth pieces. The position difference between the patterns is calculated on the basis of the waveform signal. At least one of the feed pitches of the two cloth pieces is changed on the basis of data on the calculated amount of difference and data on the sensed cloth feed pitch. Data on the position difference amount between any patterns and the position difference amount between the next patterns are compared to calculate the direction in which the position difference amount increases or decreases, namely, the direction of the difference. Adjustment is made in the direction in which the amount of difference decreases on the basis of the result of calculation of the direction.

REFERENCES:
patent: 3954071 (1976-05-01), Mall et al.
patent: 4423691 (1984-01-01), Schwaab
patent: 4574719 (1986-03-01), Balke
patent: 4612867 (1986-09-01), Rosch et al.
patent: 4658741 (1987-04-01), Jehle et al.

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