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. 25, 1978
Filed:
Feb. 16, 1977
Applicant:
Inventor:
Franz Hannemann, Detmold, DE;
Assignee:
Durkoppwerke GmbH, Bielefeld, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D05B / ;
U.S. Cl.
CPC ...
11212126 ; 112203 ;
Abstract
A feed device for flexible workpieces comprises a clamp for securing two workpieces together. The clamp is movable along a guide in line with the displacement of the workpieces past a sewing station by the sewing machine feed. A retarding force is continuously applied to the clamp to maintain a tension on the workpieces as they are drawn through the sewing station preferably by a turbine driven by compressed air. The retarding force is a continuously applied restoring force which can be switched between a relatively substantial force designed to return the clamp to its starting position and a tension force which can be reduced to substantially a zero value.