Printing – Rolling contact machines – Rotary
Reexamination Certificate
2000-08-22
2001-07-10
Eickholt, Eugene (Department: 2854)
Printing
Rolling contact machines
Rotary
C101S408000, C198S358000, C271S204000, C271S277000
Reexamination Certificate
active
06257139
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for transporting sheets and to a sheet processing machine in which sheets are separated into partial sheets. The partial sheets are then separated from each other laterally with respect to a sheet transport direction
DESCRIPTION OF THE PRIOR ART
DE-PS 15 11 067 describes a device for cutting sheets from a web. Here, the web is cut into partial webs, and these partial webs are deflected into different levels prior to being transversely cut. No spacing in the axial direction is provided by this prior art device.
DE 31 15 688 C2 discloses a device for separating usable and waste material to be obtained from a web of material. The usable material is cut out of the web by the operation of a cutting cylinder. The direction of the cut is essentially transversely in relation to the transport direction.
DE-AS 10 88 798 describes a device for separating a web into partial webs. The partial webs are spaced apart by means of guide surfaces and are cut into sheets by means of a transverse cutting device. These sheets fall onto a stack on a feed table.
DE-PS 1 175 695 discloses a processing cylinder with two gripper systems. These two gripper systems are hingedly connected with each other and are displaceable, or respectively pivotable, together.
These two gripper systems cannot be moved in relation to each other in the axial direction.
DE 24 17 614 B2 describes a device for feeding products in connection with a web-fed rotary printing press. In this case, products, which are deposited by paddle wheels and are respectively located next to each other, are conveyed by means of a product carrier.
In the course of the conveyance of the products on the product carrier, a gripper acts on respective lateral edges of the products located next to each other and moves the products transversely away from each other thereby creating a space.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method for transporting sheets, and a sheet processing machine.
In accordance with the present invention, this object is attained by separating each of a plurality of sheets into partial sheets by using at least one longitudinal cut. The partial sheets are moved apart from each other in the processing machine in a direction transverse to the direction of sheet travel. At least one chain gripper system carries at least two holding systems which are separable laterally and which can each deposit a partial sheet on a selected one of a plurality of sheet stacks. The partial sheets can have been inspected after having been cut.
The advantages which can be achieved by means of the present invention lie, in particular, in that transverse cutting from the start to the end of a sheet takes place without manual intervention in a sheet processing machine. It is possible, by means of integrated inspection devices, to control the print quality itself, as well as to control the cut registrations in the sheet processing machine. In this way, it is possible to simultaneously control the fronts and backs of the sheet, which were printed, for example, on the obverse and reverse sides of the sheet.
A simple cut registration adjustment is possible because of the cooperative operation of the transverse cutting devices with a chain conveyor. This is advantageously performed by means of a position-controlled electric motor driving a cutting cylinder.
A longitudinal cutting device is assigned to a processing cylinder of the sheet processing machine, so that the sheet is cut “in-line” into two or more partial sheets. These sheets can be deposited on stacks, which can be selected by means of the inspection device. In this manner, sorted stacks with “good” and with waste sheets are formed. This has the advantage that, in case of a defective partial sheet the entire sheet, is not wasted.
Furthermore, the partial sheets located next to each other do not interfere with each other during the continued transport, or respectively during processing, in particular during inspection of the partial sheets.
By means of this sheet processing machine, all sides of a sheet are cut and the latter is cut into partial sheets. All cuts made, as well as the obverse and reverse printing, are controlled by means of inspection devices, all the cut partial sheets are deposited on selectable stacks.
This sheet processing machine performs a plurality of processing steps “in-line”, which leads to an increase in production and also to a reduction of manual labor. Moreover, the quality of the products made in this way is increased.
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Eickholt Eugene
Jones Tullar & Cooper PC
Koenig & Bauer Aktiengesellschaft
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