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:
Dec. 21, 1993
Filed:
Sep. 24, 1991
Shushin Mori, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
In a sewing machine, a judgment is made whether a needle speed is above or below a threshold speed. When the needle speed is above the threshold speed, meaning the machine is sewing normally, a constant power is supplied at a level associated with a foot pedal setting. When the needle speed drops below the threshold, the power is alternated between power on and power off states to drive the needle in a manner similar to a hammer driving a nail. The indication of needle speed may be obtained by measuring the rotating speed of the sewing machine motor, judging the load applied to sewing machine motor, or by detecting the driving current supplied to the sewing machine motor.