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...http://www.google.fr/patents/US4777896?utm_source=gb-gplus-shareBrevet US4777896 - Sewing machine for performing pattern-correct sewing
Sewing machine for performing pattern-correct sewing
