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:
Jul. 10, 1984
Filed:
Apr. 20, 1981
Janome Sewing Machine Co., Ltd., Tokyo, JP;
Abstract
A sewing machine having a drive shaft rotated by a machine motor to vertically reciprocate a needle carrying an upper thread is provided with a device for adjusting the tension of a lower thread pulled out from a bobbin located in a bobbin carrier of the sewing machine. The device includes a tension lever cooperated with a spring element, and a releasing lever which is in engagement with a cam rotated by the drive shaft. The position of the tension lever relative to the lower thread is effected by a manually operated dial and a cam engageable with the spring element. The releasing lever is adapted to intermittently release the tension lever from the lower thread during the stitching operation.