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:
Aug. 14, 1979
Filed:
Sep. 19, 1977
Rudolf Liepert, Augsburg, DE;
Georg Spiess GmbH, Gersthofen, DE;
Abstract
An arrangement for metering a blast of air delivered to a driven machine, particularly a sheet separation device of a sheet feeder. A control slide is connected via an air intake opening to a pressure source, and the control slide has an air discharge opening connected to the driven machine and leading into the open. The latter opening is controlled or disconnected during upward movement or stoppage of the machine coupled to the driven machine by means of a control element actuated as a function of the machine speed. The air intake opening and the air discharge opening leading to the driven machine, face each other coaxially, and upon reaching a set final speed, these openings are connectable by means of a coaxial recess passing through the control element. A rotary valve plug with a through-bore is provided to form the control element. The air discharge opening leads to the outside and is located offset relative to the air intake opening in the valve plug direction of rotation corresponding to a speed reduction. The through-bore of the valve plug in this region has an oppositely-directed expansion corresponding to the amount of offset. The valve plug is connected by a crank arm mounted on a bearing trunnion, and this crank arm is connected to a servomotor operating as a function of the machine speed.