Sewing – Special machines – Darning
Patent
1986-06-24
1987-11-17
Nerbun, Peter S.
Sewing
Special machines
Darning
112315, 112275, D05B 1900, D05B 2722
Patent
active
047065842
ABSTRACT:
Herein disclosed is a control unit for providing seam length control of a sewing machine which comprises: a main shaft; a sewing needle in accordance with the rotations of the main shaft for forming stitches in a work fabric which is placed on a work supporting surface so that it may be sewn; a feed dog for feeding the work fabric while passing a sewing point of the sewing needle; a work feed mechanism including a feed bar for carrying the feed dog and a feed shaft for supporting the feed carriage, the work feed mechanism being adapted to impart motions in a feeding direction to the feed dog by the reciprocating rotations of the feed shaft in accordance with the rotations of the main shaft; and mechanical adjusting means interposed between the work feed mechanism and the main shaft for adjusting a feed pitch of the feed dog by changing the reciprocating stroke of the feed shaft. The control unit comprises: means for setting a predetermined seam length; a signal generator provided on the work feed mechanism between the feed dog and the feed shaft for generating a signal corresponding to the moving stroke of the feed dog in the feed direction; means for comparing the signal outputted from the signal generator with a signal corresponding to the set seam length; and means for changing the feed pitch of at least a final seam when the compared value reaches a predetermined value.
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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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Kozawa Tetsuo
Nomura Etsuzo
Sakakibara Yasuo
Sato Katsuhiko
Senda Yutaka
Brother Kogyo Kabushiki Kaisha
Nerbun Peter S.
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