Pattern-matching sewing machine
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsHirokazu Takeuchi, Hirosumi Itoh, Shigeru Suzuki, Etsuzo Nomura
Life of this patent
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Abstract
A pattern-matching sewing machine having a feed-correcting means for accurately adjusting feed amount using a correction factor with three values which are set according to various sewing conditions such as species of cloths and a speed of a main motor. When the feed amount for pattern matching is calculated based on only a mismatch distance detected by a photo-sensor, the accurate pattern matching is not achieved due to the various sewing conditions. Therefore, the feed-correcting means selects the optimum one of the three values to accurately correct the feed amount for a good pattern matching.
Claims4
A pattern-matching sewing machine comprising:
- a sewing means for sewing two sheets having the same pattern;
- first and second feeding means, each for intermittently feeding one of the sheets;
- first and second photo-sensing means, each for optically sensing the pattern on one of the sheets during feeding and for generating photo-intensity data at a plurality of points on the sheet;
- a mismatch detecting means for calculating mismatch distances of patterns on the two sheets from the data sensed by the first and second photo-sensing means;
- a feed-adjusting means for adjusting amounts fed by at least one of the feeding means based on the calculated mismatch distance to match the patterns;
- and
- a feed-correcting means for correcting the feed amount adjusted by the feed-adjusting means according to sewing conditions.
Dependencies are inferred from the claim text.