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. 09, 1991
Filed:
Mar. 13, 1990
Arno Wirz, Bammental, DE;
Rudi Haupenthal, Epfenbach, DE;
Heidelberger Druckmaschinen A.G., Heidelberg, DE;
Abstract
A sheet transfer device for a printing machine with a transfer drum having a rotational axis, a sheet transfer cylinder located downstream from the transfer drum in a travel direction of a sheet through the printing machine, and cooperating with the transfer drum, and a gripper device on the sheet transfer cylinder for gripping at a take-over location a leading edge of the sheet guided by the transfer drum whereby the sheet is transferred to the sheet transfer cylinder includes a sucker arrangement including suction elements disposed on the transfer drum in vicinity of a trailing edge of the sheet guided by the transfer drum, the suction elements, in a starting position thereof, being flush with the periphery of the transfer drum, a suction-air control device actuable for supplying suction air to the suction elements so that suction contact may be made between the suction elements and the sheet, a device for articulatingly linking the suction elements to the transfer drum so that the suction elements are changeable in position from the starting position thereof in a radial and tangential direction with respect to the transfer drum and beyond the periphery thereof into a swung-out position thereof, and a resilient restoring device for returning the suction elements from the swung-out position thereof to the starting position thereof, the suction-air control device being actuable for continuously applying suction air to the suction elements, after the sheet has been gripped at the take-over location, for at least so long that the transfer drum has turned through a rotary angle which is greater by an angle .alpha. than an angle .alpha., included by the suction elements, on the one hand, and by the leading edge of the sheet, on the other hand, and having its vertex in the rotational axis of the transfer drum.