Sewing machine for performing pattern-match sewing

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

1988-05-04

1989-09-19

Nerbun, Peter

Sewing

Stitch forming

Feeding work material

11212111, 112320, D05B 2706, D05B 2708

Patent

active

048670871

ABSTRACT:
A sewing machine for sewing two overlapped cloth pieces including sensor means for detecting the intensity of light transmitted through each respective cloth piece, intensity curve generating means for generating respective intensity curves over a predetermined distance, differentiation means for differentiating between the intensity curves of each cloth piece and for generating differential curves for each cloth piece, difference determining means for determining a displacement between the two differential curves and feed pitch control means for adjusting a feed pitch based on the displacement. The sewing machine of the invention matches and sews the two cloth pieces having the same lateral and vertical patterns by ignoring the detected vertical pattern data having unclear and vague broad peaks and using the detected lateral pattern data having clear sharp peaks to have the two cloth pieces' patterns matched in alignment.

REFERENCES:
patent: 4612867 (1986-09-01), Rosch et al.
patent: 4766828 (1988-08-01), Nomura
patent: 4777896 (1988-10-01), Nomura

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