Device for laterally aligning sheets being fed into a printing press and method for aligning the sheets
AssigneeHeidelberger Druckmaschinen AG
InventorGerhard Pollich
Life of this patent
Estimating the term…
Abstract
A device for laterally aligning sheets in a printing machine can have a feeding table via which the sheets are stream-fed to front lays, and a corresponding side-pull device for laterally moving the sheets after having been aligned at the front lays. The side-pull device can operate by admitting a suction to the sheets, and when moving heavy sheets, e.g. cardboard, at high machine speeds, a pull roller can supplement the suction air by pressing the sheets onto the side-pull device.
Claims17
A method for laterally aligning sheets of printing stock being fed into a printing press, the printing press having a frame, a plate cylinder rotatably mounted on the frame, the plate cylinder having a longitudinal axis and a printing width along the longitudinal axis, and sheet feeding means for feeding sheets of printing stock into the printing press, the sheet feeding means comprising at least a first surface over which sheets are moved, which sheets have a first surface for being disposed adjacent the first surface of the sheet feeding means and a second surface opposite to the first surface, said sheet alignment device comprises means for moving sheets a first distance in a direction substantially parallel to the longitudinal axis of the plate cylinder to laterally align sheets with respect to the plate cylinder, said means for moving comprising:
- a first device for engaging the first surface of sheets being fed, said first device having a portion for engaging the first surface of sheets being fed, said portion for engaging being configured to move in said direction substantially parallel to the longitudinal axis of the plate cylinder, and said portion for engaging of said first device comprises a surface having openings therein;
- suction means for providing suction at said openings to hold the first surface of sheets in contact with said portion for engaging of said first device for at least assisting movement of sheets with said portion for engaging;
- and roller means for engaging the second surface of sheets being fed and pressing the first surface of sheets being fed into engagement with said portion for engaging of said first device for at least assisting movement of sheets along with said portion for engaging of said first device, and said method comprises the steps of:
- feeding sheets of printing stock into the printing press in a first direction towards said plate cylinder;
- laterally moving ones of the sheets in a direction substantially offset from said first direction to substantially align ones of the sheets with a reference position;
- said laterally moving comprising:
- engaging the first surface of ones of said sheets with said portion of said first device, said engaging comprising:
- applying a suction through said openings of said portion for engaging of said first device to suction said ones of said sheets into engagement with said portion for engaging of said first device to hold said ones of said sheets to said portion for engaging during said lateral displacement of said portion of said first device;
- and
- pressing on said second surface of said ones of said sheets with said roller means to further engage the first surface of said ones of said sheets with said portion for engaging of said first device;
- and
- laterally displacing said portion for engaging of said first device in said direction offset from said first direction to move said ones of said sheets into said reference position.
A Printing press comprising:
- a frame;
- a plate cylinder rotatably mounted on said frame, the plate cylinder having a longitudinal axis and a printing width along the longitudinal axis;
- a plurality of ink applicator rollers for being engaged with said plate cylinder and for applying ink to said plate cylinder;
- a plurality of inking roller for applying ink to said plurality of ink applicator rollers;
- said plate cylinder having a printing width for accommodating ink, and said plurality of inking rollers having an inkable width corresponding to the printing width of said plate cylinders;
- means for supplying ink to said plurality of inking rollers;
- sheet feeding means for feeding sheets of printing stock into said printing press, said sheet feeding means comprising at least a first surface over which sheets are moved, which sheets have a first surface for being disposed adjacent said first surface of said sheet feeding means and a second surface opposite to said first surface;
- and
- means for moving sheets a first distance in a direction substantially parallel to the longitudinal axis of said plate cylinder to laterally align sheets with respect to said plate cylinder;
- said means for moving comprising:
- a first device for engaging the first surface of sheets being fed, said first device having a portion for engaging the first surface of sheets being fed, said portion for engaging being configured to move in said direction substantially parallel to said longitudinal axis of said plate cylinder, and said portion for engaging comprises a surface having openings therein;
- suction means for providing suction at said openings to hold the first surface of sheets in contact with said portion for engaging of said first device for at least assisting movement of sheets along with said portion for engaging of first device;
- and
- roller means for engaging the second surface of sheets being fed and pressing the first surface of sheets being fed into engagement with said portion for engaging of said first device for at least assisting movement of sheets along with said portion for engaging of first device;
- said roller means being pivotable towards said first device to engage a sheet between said first device and said roller means, and away from said first device to release a sheet from engagement between said roller means and said first device;
- and
- said printing press further comprises:
- switch means for switching on said suction means upon said roller means being pivoted into engagement with a sheet;
- and
- means for releasing at least part of said suction upon the sheet having been moved at least a portion of said first distance.
A sheet alignment device for aligning sheets of printing stock being fed into a printing press, the printing press having a frame, a plate cylinder rotatably mounted on the frame, the plate cylinder having a longitudinal axis and a printing width along the longitudinal axis, and sheet feeding means for feeding sheets of printing stock into the printing press, the sheet feeding means comprising at least a first surface over which sheets are moved, which sheets have a first surface for being disposed adjacent the first surface of the sheet feeding means and a second surface opposite to the first surface;
- and said sheet alignment device comprising:
- means for moving sheets in a direction substantially parallel to the longitudinal axis of the plate cylinder for laterally aligning sheets with respect to the plate cylinder;
- said means for moving comprising:
- a first device for engaging the first surface of sheets being fed, said first device having a portion for engaging the first surface of sheets being fed, said portion for engaging being configured to move in said direction substantially parallel to the longitudinal axis of the plate cylinder, said portion for engaging comprises a surface having openings therein;
- suction means for providing suction at said openings to hold the first surface of sheets in contact with said portion for engaging of said first device for at least assisting movement of sheets along with said portion for engaging of said first device;
- and
- roller means for engaging the second surface of sheets being fed and pressing the first surface of sheets being fed into engagement with said portion for engaging of said first device for movement of sheets along with said portion for engaging of said first device.
Dependencies are inferred from the claim text.