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. 31, 1984
Filed:
Mar. 10, 1983
Bruno Motta, Milan, IT;
Erminio Nava, Arese, IT;
Rockwell-Rimoldi S.p.A., , IT;
Abstract
An apparatus for adjusting stitch length in a sewing machine by means of a selectively adjustable eccentric possessing a self-locking device. The apparatus includes a support collar fixed on the machine's main shaft with an eccentric support mounted on the support collar which is operatively connected to a connecting rod for actuating the machine's feed dog. The eccentric support includes a central opening within which the adjustable eccentric is operatively disposed and which forms an integral part of a support ring rotatably mounted on the machine's main shaft. A manually operable push button serves to hold the support ring stationary and to release the self-locking device. The machine includes the conventional hand wheel fixed on one end of the machine's main shaft and, while the pushbutton is held in a depressed condition, the self-locking device remains in a released state thus enabling the selective rotation of the machine's main shaft by the hand wheel. This rotation effects a change in position of the adjustable eccentric within the eccentric support and the amount the connecting rod travels to actuate the feed dog. The selective positioning of the adjustable eccentric is maintained by release of the push button that activates the self-locking device.