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:
Feb. 19, 1991
Filed:
May. 22, 1990
Kenji Matsubara, Aichi, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
A sewing machine includes a timing pulse generator, a thread feeding device, thread sensor, and microcomputer. The timing pulse generator generates a timing pulse when a main shaft is rotated by a predetermined rotational increment by a main motor. The thread feeding device feeds out a needle thread toward a needle. The thread sensor is disposed in a path of the needle thread between the thread feeding device and the needle, and generates a thread breakage signal when the needle thread is out of the path. The microcomputer drives the thread feeding device based on the timing signal generated by the timing pulse generator if the thread breakage signal is not generated by the thread sensor. The microcomputer counts the timing pulses after the thread breakage signal has been generated by the thread sensor. The microcomputer stops the main motor when a count value has reached first predetermined value. The microcomputer stops the thread feeding device when the count value has reached a second predetermined value which is smaller than the first predetermined value.