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. 20, 1983
Filed:
Nov. 09, 1981
Adriano Alberti, Pavia, IT;
Rockwell International Corporation, Pittsburgh, PA (US);
Abstract
An upper feed dog for sewing machines carried by an actuating arm pivotably mounted on a support fixed to the upper surface of the main feed bar that carries the main lower feed dog. A control arm has one end pivotably connected to the same pivot as the actuating arm and its opposite end is pivotably connected to a guide block carried in one end of a double-forked lever. The opposite end of this lever is operatively associated with an oscillatably driven shaft, the motion of which is transmitted to the actuating arm by a coil spring interposed between the latter arm and the control arm and is effective so as to cause pressure of the upper feed dog on a workpiece to be progressive and prevent direct impact between the control arm and the actuating arm, whereby the operating noise level of the machine operating at high speed is greatly reduced.