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. 31, 1991
Filed:
Mar. 19, 1991
Josef Marass, Murnau, DE;
George Spiess GmbH, Gersthofen, DE;
Abstract
In the case of a sheet feeder comprising a suction head which is arranged over a rising table for a stack of sheets and bears at least one sucker able to be connected with a source of vacuum and with air synchronously in steps with the operation of the equipment, a cam predetermined such steps and, following the suction head, a sheet conveyor, it is possible to achieve a more precise operation and more gentle handling of the products by providing an air supply duct and a vacuum duct, which are associated with the at least one sucker provided, and alternately switched on and off by a switching valve arranged near the sucker. For its part, the valve is operated by a control valve, actuated by the cam.