Method and device for aligning sheets
AssigneeHeidelberger Druckmaschinen AG
InventorJeschke Willi
Life of this patent
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Abstract
A method of aligning sheets during stream feeding of a multiplicity of sheets over a feed table to a first steadily rotating cylinder of a sheet-processing medium includes in a first feeding stage, conveying the sheets in an imbricated arrangement thereof via the feed table and in a given direction to an alignment region; in a second feeding stage, aligning a lateral and a leading edge of the sheets in the alignment region while the sheets remain in the imbricated arrangement thereof and without interrupting movement of the sheets in the given direction and, in a third feeding stage, accelerating the speed at which the sheets are stream fed to a peripheral speed of a rotating cylinder and feeding the sheets to the first steadily rotating cylinder, while finally aligning the sheets at front markers.
Claims21
Method of aligning sheets during stream feeding of a multiplicity of sheets over a feed table to a first steadily rotating cylinder of a sheet-processing machine, which comprises in a first feeding stage, conveying the sheets in an imbricated arrangement thereof via the feed table and in a given direction to an alignment region;
- in a second feeding stage, aligning a lateral and a leading edge of the sheets in the alignment region while the sheets remain in the imbricated arrangement thereof and without interrupting movement of the sheets in the given direction and, in a third feeding stage, accelerating the speed at which the sheets are stream fed to a peripheral speed of a rotating cylinder and feeding the sheets to the first steadily rotating cylinder, while finally aligning the sheets at front markers.
Device for aligning sheets as a multiplicity of the sheets are being stream fed over a feed table to a first steadily rotating cylinder of a sheet-processing machine, comprising a conveyor system disposed in an upper region of a feed table for conveying the sheets in an imbricated arrangement thereof and in a given direction to an alignment region;
- diagonal drive means disposed in said feed table downstream of said conveyor system in said given conveying direction and located at said alignment region for driving the sheets in a direction transverse to said given conveying direction, side markers disposed at opposite sides of said alignment region in said given conveying direction, and preliminary leading-edge alignment markers carried by said diagonal drive means and revolvable in said given conveying direction, said alignment region together with said diagonal drive means, said side markers and said preliminary leading-edge alignment markers being connected with said conveyor system on said feed table;
- an acceleration device cooperating with said diagonal drive means for accelerating the conveying speed of the sheets to a peripheral speed of an impression cylinder;
- and front markers disposed on at least one conveying device following said diagonal drive means.
Device for alining sheets as a multiplicity of the sheets are being stream fed over a feed table to a first steadily rotating cylinder of a sheet-processing machine, comprising a conveyor system disposed in an upper region of a feed table for conveying the sheets in an imbricated arrangement thereof and in a given direction to an aligment region;
- diagonal drive means disposed in said feed table downstream of said conveyor system in said given conveying direction and located at said alignment region for driving the sheets in a direction transverse to said given conveying direction, side markers disposed at opposite sides of said alignment region in said given conveying direction, and preliminary leading-edge alignment markers carried by said diagonal drive means and revolvable in said given conveying direction, said alignment region together with said diagonal drive means, said side markers and said preliminary leading-edge alignment markers being connected with said conveyor system on said feed table;
- an acceleration device cooperating with said diagonal drive means for accelerating the conveying speed of the sheets to a peripheral speed of an impression cylinder;
- and front markers disposed on at least one conveying device following said diagonal drive means, said diagonal drive means comprising sheet-guiding drive elements located in said alignment region and revolving in the conveying direction of the sheets, said drive elements having a speed which is at most equal to the stream feeding speed of the imbricated sheets, said preliminary leading-edge alignment markers being disposed on said drive elements, blowing suction nozzles disposed in said alignment region in the feed table for holding the sheets and for placing them, respectively, in engagement with said preliminary leading-edge alignment markers as well as a side marker rail, said acceleration device comprising suction rollers for taking up the sheets and accelerating the conveying speed thereof to said peripheral speed of said impression cylinder, and said one conveying device following said diagonal drive means comprising said first steadily rotating cylinder and carrying said front markers.
Dependencies are inferred from the claim text.