Method of feeding sheets to a sheet-processing machine, sheet-smoothing method and device
AssigneeHeidelberger Druckmaschinen AG
InventorsHans Butterfass, Wolfgang Dolz, Hendrik Frank, Andreas Henn, Markus Mohringer
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Abstract
In a method and an apparatus for feeding sheets to a sheet-processing machine, the leading edge of the sheet is smoothed before the grippers are closed by further transport into the sheet-processing machine. A curvature or bend in the sheet transport direction is imparted to the sheet. The feed table has, in its feeder region, a curvature in the sheet transport direction, against which curvature the sheet leading edge is laid with the aid of pneumatic or mechanical devices.
Claims19
A method of feeding sheets to a sheet-processing machine, which comprises the following steps:
- placing a sheet with a leading edge, as defined by a sheet transport direction through the machine, against front lays on a feed table with a transport device;
- smoothing the leading edge of the sheet by imparting to the sheet a curvature in the sheet transport direction;
- and
- subsequently gripping the sheet with a further transport device.
In a sheet-processing machine, an apparatus for feeding sheets to the sheet-processing machine, comprising:
- a feed table formed with a guide surface in a feeder region thereof, said guide surface being curved in a sheet transport direction to the sheet-processing machine, and a smoothing device configured to assist in laying the sheet against said guide surface.
In an apparatus for guiding sheets to a sheet-processing machine, the apparatus having a feed table with a feeder region, the improvement which comprises:
- the feed table having a plurality of suction openings formed in the feeder region and arranged transversely with respect to a sheet transport direction, and a vacuum device configured to sequentially apply a vacuum to said suction openings one after another, starting from a center opening and in each case laterally outward.
Dependencies are inferred from the claim text.