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:
Jan. 02, 1996
Filed:
May. 10, 1994
Rudi Haupenthal, Epfenbach, DE;
Heidelberger Druckmaschinen AG, Heidelberg, DE;
Abstract
A suction-air control device for a rotatable sheet-transfer drum having suction-type grippers disposed thereon and having a journal with a rotationally symmetrical surface, includes a rotary valve disposed on the journal of the sheet-transfer drum for connecting the suction-type grippers to a stationary suction-air source. A stationary housing is provided for the rotary valve. A device controls a supply of suction air from the suction-air source to the suction-type grippers with a time lead or a time lag as a function of the rotational speed of the sheet-transfer drum. At least one suction-air bore extends from the interior of the journal to the surface thereof. One suction-air bore is connectable to the suction-type grippers. The rotationally symmetrical surface of the journal forms a sealing surface of the rotary valve. At least one closing member formed with at least one air-passage opening disposed over a defined rotational-angle range connects the one suction-air bore formed in the journal with at least one connection hole formed in the housing of the rotary valve.