Printing – Rolling contact machines – Rotary
Patent
1990-03-13
1991-07-09
Fisher, J. Reed
Printing
Rolling contact machines
Rotary
101410, B41F 2106, B41F 2110, B41L 2108
Patent
active
050295241
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.
REFERENCES:
patent: 3992993 (1976-11-01), Kuhn et al.
patent: 4370928 (1983-02-01), Weisbach et al.
patent: 4378734 (1983-04-01), Wirz
patent: 4580494 (1986-04-01), Becker
Haupenthal Rudi
Wirz Arno
Fisher J. Reed
Greenberg Laurence A.
Heidelberger Druckmaschinen A.G.
Lerner Herbert L.
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