The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1987
Filed:
Jun. 24, 1986
Yutaka Senda, Aichi, JP;
Katsuhiko Sato, Nagoya, JP;
Tetsuo Kozawa, Toyoake, JP;
Etsuzo Nomura, Kasugai, JP;
Yasuo Sakakibara, Hekinan, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
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.