DE10239708A1

DE10239708A1 - Device for guiding/slowing down sheets in the extension arm of a sheet-processing machine, especially a printing machine, comprises a sheet guiding surface having openings loaded with suction or blast air, and a gripping system

Info

Publication number: DE10239708A1
Application number: DE10239708A
Authority: DE
Inventors: Michael Dr.-Ing. Koch; Jörg Dr.-Ing. Reber; Tilo Dipl.-Ing. Steinborn
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 2002-08-29
Filing date: 2002-08-29
Publication date: 2004-03-11
Anticipated expiration: 2022-08-30
Also published as: DE10239708B4

Abstract

The present invention relates to a device for guiding and braking of sheets in the boom of a sheet-processing machine, in particular printing press. DOLLAR A object of the invention is to provide such a device in which the sheets are braked reliably even at high processing speeds and stored edge to edge. DOLLAR A The object is achieved by a device consisting of a below the Bogenförderweges arranged sheet guiding device (8) with a Bogenleitfläche (4), the openings (9), which are acted upon with suction or blown air from a gripper system (5), that the respective sheet (1) in the vicinity of its trailing edge in a sheet transfer area (6) detected and transferred to the delivery stack (3), wherein the gripper system (5) after reaching the sheet transfer area (6) is braked and the sheet guide surface (4) having the gripper system (5) corresponding recesses (7) which pass through the gripper system (5) while it detects the respective sheet (1).

Description

The present invention relates refers to a device for guiding and braking of sheets in Boom of a sheet-processing machine, in particular printing machine.
The processed in the printing units of the printing press Sheets are taken from the last sheet-guiding cylinder of the press removed and from circulating transport systems to a delivery pile transported, where possible as accurate as possible should be stored on each other. To guide the one-sided or two-sided printed sheets are along the sheet transport path sheet guiding devices arranged with means for braking the abzulegenden Collaborate arc.

For the purpose of laying out of sheet is from the DE PS 394 052 DE a device known in which sheets are transported by a feeder to the delivery stack and detected at its trailing edge of grippers and stored against the direction of the execution movement on the delivery pile. The disadvantage of such a device is the heavy stress on the bow on train, which is associated with the reversal of motion. In addition, the sheet trailing edge can not be detected in particular by mechanical grippers with sufficient security.

The DE PS 627 851 describes a delivery device for sheet-fed printing presses, in which the sheets are transported with front edges fixed by front grippers in the direction of an outfeed pile and, before being deposited thereon, are grasped at their trailing edge by picking grippers. The Nachgreifer move after the release of the sheet leading edges at a delayed speed, so that the respective sheet is decelerated until it reaches approximately the horizontal speed zero. In the boom below the transport path of the sheet line serving steel rails are provided, which are mounted on mounting rails.

Is the respective arc recorded, it is braked in a gentle way. The detection of the sheet trailing edge but not with sufficient security. In particular in high-speed sheet-processing machines and / or in the Processing big Bogenformate arises under the respective bow a Schleppströmung, and the Bow trailing edge is lifted off the steel rails. As a result of drag flow and dependent From the parameters of the print job, the webs of the sheet trailing edge can edge from print job to print job, but also from sheet to sheet strong vary and outside lie the detection range of the trailing edge Nachgreifers.

The in the DE 197 39 893 A1 The disclosed sheet guiding device is arranged downstream of a guide device in the sheet transport direction and extends to a suction roller serving to decelerate the conveyed sheet. The sheet guiding device is articulated pivotably about a pivot point, mounted with a level in the printing pressure in the amount of the suction roll and a lowered in perfecting pressure from the pivot point in the direction of the suction roll level. In straight printing, it can be subjected to a negative pressure.

The disadvantage of such an arrangement is that the respective arc when braking on the Suction roll side facing due to the between suction roll and bow surface resulting slip is mechanically stressed. Especially at thin Papers exist, especially if they are at high speeds be processed, the risk of destruction of the bow as a result of By suction.

When the bow leaves the area where he is exposed to the braking action of the suction roll, he must, to his To reach final position on the delivery pile, still a distance in vertical and horizontal direction, in which he is not forced. Leading to an uneven sheet storage on the delivery pile and requires additional alignment equipment the sheet edge, e.g. in the form of attacks.

Due to the residual speed, with the bow bounce against such attacks, the Sheet edges damaged become.

The invention is based on the object, under Avoiding the aforementioned disadvantages, a device for conducting and braking of sheets in the boom of a sheet processing machine to create at the bow even at high processing speeds Reliable braked and stored edge to edge.

According to the invention this object is achieved with a Device of the type mentioned, the features of the claim 1 has. Advantageous embodiments are the subject of the dependent claims.

The present invention has the advantage that the trailing edge of the single-sided sheet is guided in the manner of forced operation on a sheet fed with suction sheet guiding surface or printed on both sides bow in Schwebführung on the acted upon with blowing air Bo geneleitfläche. By arranging corresponding with the gripper system recesses in the sheet guide, which can pass through the gripper system, it is achieved that the gripper system detects the respective sheet at the trailing edge, while this is still guided by the sheet guide. The movement of the gripper system provided for gripping the sheet trailing edge is due to the movement of the We kung of the suction air sucked to the sheet guide surface or tuned at a small distance above the sheet guide surface under the action of blowing air trailing sheet trailing edges. The trajectory of the sheet trailing edges always runs through an area in which the sheet trailing edges can be detected by the gripper system. The secure detection of the sheet is thus ensured regardless of grammage, format, processing speed or the thickness of the applied in the sheet processing machine paint and varnish layers.

In addition, with the on the arch over the openings the sheet guiding surface acting suction due to friction forces generated, which counter to the direction of movement act on the bow and these punish or an undesirable Buckling or counteract wrinkling. When leading by Double-sided printing can be done by applying the blast air Lubrication can be effectively avoided, which is safe Capture the bow but does not preclude.

It goes without saying that an embodiment of the invention, in which the sheet guiding device is supplied with blowing air is also suitable for detecting and braking of printed in straight printing sheet is.

The post-gripper system detects the Bow trailing edge and transferred the Bow on the delivery pile, slowing down gently and subsequently be stored edge to edge. This can provide additional facilities for alignment the bow on the delivery pile accounts.

The present invention is suitable therefore especially for The use in high - speed printing machines, the bow in beautiful printing or in the Nice- and printing on and for the processing of large format Bow are provided.

Finally, by the use a bow at the trailing edge grasping gripper system that Corridor-free printing possible.

Reference to an embodiment, the following Invention closer explained become. In the corresponding Drawings shows:
1 the schematic representation of a portion of a boom, in which the device according to the invention for guiding and braking of sheets is arranged and 2 a plan view of the openings having sheet guide surface of the sheet guiding device.
As in 1 shown, are removed from the processing stations of a sheet-processing machine arc 1 of subsidies 2 gripper carriages carrying gripper carriages gripped at their leading edges and along a sheet conveying path to a delivery pile 3 fed. The gripper carriages are part of a chain 10 and not shown Kettenumlenkräder comprehensive circulating chain conveyor system.
Below the sheet conveying path is a over the width of the boom extending sheet guiding device 8th arranged on its side facing the Bogenförderweg a flat sheet guide surface 4 with openings 9 having. The openings 9 are above one below the arched surface 4 arranged tub interconnected. For generating the suction air or the blown air, an air supply device connected to the tub is provided. The air supply device can also be arranged in the trough.
For the guidance of printed in straight printing bow 1 is an admission with suction air and for the guidance of in perfecting printed sheet 1 a Blasluftbeaufschlagung provided. In an embodiment of the invention, not shown, are considered in the sheet conveying direction, at the beginning of the sheet guide 4 arranged openings 9 with blowing air and at the end of the sheet guiding surface 4 arranged openings 9 can be acted upon with suction air. In this for guiding printed in perfecting bow 1 intended execution are the bow 1 floating and guided only in the area of their trailing edges of the sheet guide 4 approximated. This minimizes the mechanical stress on the underside of the sheet, without affecting the sheet guiding surface 4 touch. This is achieved by keeping the intensity of the adjacent suction air small in comparison to the intensity of the applied blown air.
In sheet travel direction in front of the delivery pile 3 is a gripper system 5 provided, which serves the sheet braking and suction pads or over these preferred pliers gripper comprises, driven by a Kurvenkoppelgetriebe 11 after the beat of the incoming bow 1 describe an elliptical orbit. The gripper system 5 can handle the incoming bows 1 to detect when their trailing edges through a sheet takeover area 6 move. The sheet transfer area 6 is through the with the cam coupling 11 Realized movement and the movements specified when opening and closing the forceps gripper. The pincers are attached to the trailing edges of the moving bow 1 introduced so that they in the sheet transfer area 6 can be detected. Subsequently, the gripper system leads 5 the bows 1 after its leading edges from the conveyors 2 were released to the delivery pile 3 on which they are released by the gripper system 5 be filed.
The path of the gripper system 5 and the opening curve of the gripper system 5 included pliers gripper is set so that these are under the action of suction on the sheet guide 4 or under the action of blowing air at a small distance above the sheet guide surface 4 out bow 1 capture safely.
On her the delivery pile 3 facing side, the sheet guide surface 4 with the gripper system 5 corresponding recesses 7 which are slightly larger than the forceps grippers of the gripper system 5 and the gripper system 5 happens while there is the respective bow 1 detected.
By such a design of the sheet guiding surface 4 The pincers can grip the trailing edges of the arch 1 capture while the bow 1 still from the sheet guiding surface 4 be guided. The arrangement of recesses 7 thus enables the combination of a floating and lubrication-free sheet guide on a sheet guiding surface 4 , with a bow 1 gently decelerating and edge-precise on the delivery pile 3 depositing braking device in the form of acting as a trailing edge gripper rapier system 5 ,
The sheet guiding surface 4 and the gripper system 5 are arranged to format adaptation to each other and slidably along the Bogenförderweges.
In a variant of the invention, not shown, the sheet guiding surface 4 to vote the Bogenförderweges on the sheet transfer area 6 on their gripper system 5 facing side arranged infinitely adjustable in height. For this purpose, it can be articulated and designed to be pivotable or flexible relative to the machine frame.

1: bow
2: funding
3: delivery pile
4: sheet guide surface
5: gripper system
6: Arc-over zone
7: recesses
8th: sheet guiding device
9: openings
10: Chain
11: Curve linkage

Claims

Device for guiding and braking sheets in the delivery of a sheet-processing machine, in particular a printing press, which is fed along an sheet conveying path to a delivery pile ( 3 ) are transported, - consisting of a below the Bogenförderweges arranged sheet guiding device ( 8th ) with a sheet guide surface ( 4 ) the openings ( 9 ), which can be acted upon by suction air or blowing air, - further comprising a gripper system ( 5 ), which the respective bow ( 1 ) near its trailing edge in a sheet transfer area ( 6 ) and on the delivery pile ( 3 ), whereby - the gripper system ( 5 ) after reaching the sheet acceptance area ( 6 ) is braked and - the sheet guide ( 4 ) with the gripper system ( 5 ) corresponding recesses ( 7 ), which the gripper system ( 5 ) happens while it is the respective arc ( 1 ) detected.
Apparatus for conveying sheets according to claim 1, wherein the sheet transfer area ( 6 ) with the sheet guide surface ( 4 ) is approximately in one plane.
A sheet conveying apparatus according to claim 1 or 2, wherein those adjacent to the recesses ( 7 ) arranged openings ( 9 ) with suction air and the to the recesses ( 7 ) spaced openings ( 9 ) can be acted upon with blown air.
Device for conveying sheets according to one of the preceding claims, wherein the sheet guiding surface ( 4 ) and the gripper system ( 5 ) are displaced to format adaptation along the Bogenförderweges displaceable.
Device for conveying sheets according to one of the preceding claims, wherein the openings ( 9 ) via one below the sheet guide surface ( 4 ) arranged tub are interconnected.
Device for conveying sheet according to claim 5, wherein the tray is provided with an air supply device, with the optional blowing or suction air can be generated, is connected.
Device for conveying sheet according to claim 6, wherein the air supply device is arranged in the tub.
Device for conveying sheets according to one of the preceding claims, wherein the gripper system ( 5 ) Pliers gripper and a cam coupling gear ( 11 ).
Device for conveying sheets according to one of the preceding claims, wherein the sheet guiding surface ( 4 ) for matching the sheet conveying path to the sheet transfer area ( 6 ) on their gripper system ( 5 ) facing side is arranged height adjustable.
Apparatus for conveying sheets according to claim 9, wherein the sheet guiding surface ( 4 ) is pivotally mounted pivotably about a pivot point.