Device for knocking off sheet material
AssigneeHeidelberger Druckmaschinen AG
InventorGerhard Heppenstiel
Life of this patent
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Abstract
A knock-off unit for knocking off sheet material from the circumferential surface of an impression cylinder in a rotary printing machine operatable in recto and in recto/verso or perfector printing modes, includes a knock-off device mounted on a rectilinear guide and controllable by a gripper shaft for lifting a leading region of the sheet material off the circumferential surface of the impression cylinder. The knock-off device is coupled via a transmission mechanism to said gripper shaft and, during an outward movement, said knock-off device being extended beyond the circumferential surface of the impression cylinder, initially bridging an idle stroke; an impression cylinder in combination with the knock-off unit; and a printing unit having the knock-off unit.
Claims14
A knock-off unit for knocking off sheet material from the circumferential surface of an impression cylinder in a rotary printing machine operatable in recto and in recto/verso or perfector printing modes, comprising a knock-off device mounted on a rectilinear guide and controllable by a gripper shaft for lifting a leading region of the sheet material off the circumferential surface of the impression cylinder, said knock-off device being coupled via a transmission mechanism to said gripper shaft and, during an outward movement, said knock-off device being extended beyond the circumferential surface of the impression cylinder, initially bridging an idle stroke, said transmission mechanism including a pivoting lever, a couple and a tilting lever articulatedly connected to one another.
An impression cylinder for a sheet-processing printing machine operatable in recto printing mode and in recto/verso printing modes, in combination with a knock-off unit for knocking off sheet material from the circumferential surface of the impression cylinder, comprising a knock-off device mounted on a rectilinear guide and controllable by a gripper shaft for lifting a leading region of the sheet material off the circumferential surface of the impression cylinder, said knock-off device being coupled via a transmission mechanism to said gripper shaft and, during an outward movement, said knock-off device being extended beyond the circumferential surface of the impression cylinder, initially bridging an idle stroke, said transmission mechanism including a pivoting lever, a couple and a tilting lever articulatedly connected to one another.
A printing unit for a sheet-processing printing machine operatable in recto and in recto/verso printing modes, having a knock-off unit for knocking off sheet material from the circumferential surface of an impression cylinder of the printing unit, comprising a knock-off device mounted on a rectilinear guide and controllable by a gripper shaft for lifting a leading region of the sheet material off the circumferential surface of the impression cylinder, said knock-off device being coupled via a transmission mechanism to said gripper shaft and, during an outward movement, said knock-off device being extended beyond the circumferential surface of the impression cylinder, initially bridging an idle stroke, said transmission mechanism including a pivoting lever, a couple and a tilting lever articulatedly connected to one another.
Dependencies are inferred from the claim text.