Apparatus for supplying a shingled or overlapping sheet stream
AssigneeKoenig & Bauer Aktiengesellschaft
InventorArndt Jentzsch
Life of this patent
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Abstract
The invention relates to a device for supplying a shingled or overlapping sheet stream from a stack of sheets of a sheet feeder to a feed table of a sheet-processing machine with a belt table. The belt table is provided with at least one revolvingly driven suction belt, which is in operative connection with at least two suction boxes that can be acted upon by negative pressure. The invention can include a device for taking hold of the sheets. The invention also relates to altering a device so that, independently of the material to be processed, a last sheet of a sheet stream can be easily aligned. This objective is accomplished as follows: after the last sheet is detected and its front edge has been placed against the front guide stops, the operation of the suction belt is stopped.
Claims14
An apparatus for supplying a shingled or overlapping sheet stream from a stack of sheets of a sheet feeder to a feed table of a sheet-processing machine with a belt table, which is provided with at least one revolvingly driven suction belt in operative connection with at least two suction chambers, which can be acted upon by a supply of negative pressure, said apparatus including a front guide stop and a device for detecting a last sheet in the sheet stream, wherein the at least one revolvingly driven suction belt is adapted to stop operating after the last sheet of the sheet stream is detected by the device for detecting and the front edge of the last sheet has been placed against the front guide stop, and wherein one of the at least two suction chambers is a lower suction chamber that faces the front guide stop and is connected with the suction belt, the lower suction chamber adapted to be adjustably vented to interrupt the supply of negative pressure to said lower suction chamber within a working cycle leading the last sheet to the front guide stop.
An apparatus for supplying a shingled or overlapping sheet stream from a stack of sheets of a sheet feeder to a feed table of a sheet-processing machine with a belt table, which is provided with at least one revolvingly driven suction belt in operative connection with at least two suction chambers, which can be acted upon by a supply of negative pressure, said apparatus including a front guide stop and a device for detecting a last sheet in the sheet stream, wherein the at least one revolvingly driven suction belt is adapted to stop operating after the last sheet of the sheet stream is detected by the device for detecting and the front edge of the last sheet has been placed against the front guide stop, and wherein one of the at least two suction chambers is a lower suction chamber that faces the front guide stop and is connected with the suction belt, the lower suction chamber adapted to be adjustably vented to interrupt the supply of negative pressure to said lower suction chamber within a working cycle leading the last sheet to the front guide stop, the apparatus further comprising a control unit and a servo unit operably connected and responsive to the control unit, the servo unit being adapted to control the supply of negative pressure to the lower suction chamber in accordance with the control unit, and a double-sheet control for detecting the last sheet and transmitting a signal to the control unit when the last sheet is detected.
An apparatus for supplying a sheet stream including a last sheet to a sheet-processing machine, comprising:
- a belt table provided with at least one revolvingly driven suction belt and at least two suction chambers, said at least one revolvingly driven suction belt being in operative connection with said at least two suction chambers, said at least two suction chambers being able to be acted upon by a supply of negative pressure controlled by a servo unit;
- a feed table having a front guide stop, said feed table being disposed downstream of said belt table;
- and
- a device for detecting said last sheet;
- wherein said at least one revolvingly driven suction belt is adapted to stop operation when said last sheet of said sheet stream is detected by said device for detecting said last sheet and a front edge of said last sheet is placed against said front guide stop;
- and
- wherein one of said at least two suction chambers is a lower suction chamber, said lower suction chamber facing said front guide stop and being able to be vented, and wherein said supply of negative pressure to said lower suction chamber can be interrupted within a working cycle leading said last sheet to said front guide stop.
Dependencies are inferred from the claim text.