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US 5,131,647 AGranted
Sheet feeder for printing machines and the like
AssigneeHeidelberger Druckmaschinen AG
InventorsManfred Henn, Udo Ganter
Life of this patent
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AssigneeHeidelberger Druckmaschinen AG
InventorsManfred Henn, Udo Ganter
Estimating the term…
A sheet delivery for a printing machine or the like with a device for changing a sheet pile while the machine is in operation, includes suction-type grippers insertable into a sheet feeder, opposite to a conveying direction of the sheets and between pile stops for a leading edge of the sheets, the suction-type grippers having a device for gripping by suction, in an inserted end position of the grippers, the leading edge of a sheet deposited onto the suction-type grippers and for holding the sheet at a distance above the sheet pile in an auxiliary-pile position, so as to permit the insertion of an auxiliary-pile device beneath the sheet, and a device for stretching the sheet after the leading edge of the sheet has been gripped by the inserted suction-type grippers, the sheet-stretching device being effective for withdrawing the suction-type grippers a predetermined distance towards the pile stops for the leading edge of the sheet.
Sheet delivery for a printing machine or the like with a device for changing a sheet pile while the machine is in operation, comprising suction-type grippers insertable into a sheet feeder, opposite to a conveying direction of the sheets and between pile stops for a leading edge of the sheets, said suction-type grippers having means for gripping by suction, in an inserted end position of said grippers, the leading edge of a sheet deposited onto the suction-type grippers and for holding the sheet at a distance above the sheet pile in an auxiliary-pile position, so as to permit the insertion of an auxiliary-pile device beneath the sheet, and means for stretching the sheet after the leading edge of the sheet has been gripped by said inserted suction-type grippers, said sheet-stretching means being effective for withdrawing said suction-type grippers a predetermined distance towards the pile stops for the leading edge of the sheet.
Sheet delivery for a printing machine or the like with a device for changing the sheet pile while the machine is in operation, comprising first suction-type grippers formed as catch fingers for a leading edge of a sheet and being insertable between pile stops of the sheet, and second suction-type grippers formed as catch fingers for a trailing edge of the sheet, both said first and said second suction-type grippers being insertable above a sheet pile parallel to a conveying direction of the sheet and having means for gripping and holding, in an inserted end position of both said first and said second suction-type grippers, a sheet deposited at its leading and trailing edges thereon, for forming an auxiliary pile above the sheet pile, said first and said second suction-type grippers having suction nozzles at upper sides thereof whereon the sheet edges are deposited, and having sheet-stretching means for withdrawing said first and said second suction-type grippers from said inserted end position thereof a given distance in a direction opposite to the direction of insertion thereof.
Dependencies are inferred from the claim text.