DE102013220052A1 - Delivery device for sheet printing machine, has sheet conveyed to leading edge gripper and trailing edge gripper carriages that are fixed to sheet stack, where trailing edge gripper carriage is connected to pulling unit through slots - Google Patents

Abstract

The device has a first conveyor system provided with a circumferentially-extendable leading edge gripper carriage (2). A second conveyor system is provided with a circumferentially-executable trailing edge gripper carriage (3). A sheet (4) is conveyed to the leading edge gripper carriage and the trailing edge gripper carriage that are fixed to a sheet stack (5). The trailing edge gripper carriage is partially movable relative to a tension unit. The trailing edge gripper carriage is connected to a pulling unit through slots. An independent claim is also included for a method for transporting sheets to a sheet processing machine.

Description

The invention relates to a delivery device of a sheet-processing machine with a sheet conveying system for transporting sheets to a sheet stack according to the preamble of claim 1 and a method for transporting sheets in a delivery of a sheet-processing machine to a stack of sheets.

From the DE 41 19 188 C1 is a controllable gripper unit for sheet delivery in printing presses known to be taken with the sheet leading edges and which is arranged opposite to the direction opposite the transport chains slidably. A disadvantage of this solution is that the sheets are gripped only at the leading edges and thereby fluttering on the Bogenförderweg. Especially at higher machine speeds therefore occur smearing on the printed image. Further, additional filing systems are needed to retard and streamline the sheets on the stack.

From the DE 10 2007 061 394 A1 is a boom of a sheet-processing machine, in particular printing machine, known in which the rear edge gripper systems are arranged by means of coupling to chains for the displacement of the trailing edge gripper systems relative to the leading edge gripper systems. Due to the different from the chain orbit of the trailing edge gripper systems they are moved relative to the leading edge gripper systems. A disadvantage of this solution is that a deviating from the chain conveyor orbit of the trailing edge gripper systems is structurally complex and not enough for a sheet deposition at reduced speed.

The invention is therefore based on the object to further improve the sheet transport in a sheet-processing machine.

According to the invention the object is achieved by a device having the features of the independent device claim and a method having the features of the independent method claim. Advantageous embodiments will become apparent from the dependent claims, the description and the drawings.

The invention has the advantage that the sheet transport is improved in a sheet-processing machine.

In one embodiment of the invention, it is provided to attach a trailing edge gripper system to a traction device such that it is guided along the traction center path and relative to the sheet trailing edge performs a relative movement.

In a preferred embodiment of the invention, the trailing edge gripper system is formed as a chain on a chain track circumferentially guided gripper carriage, which is arranged on two elongated holes on chain pins of the chains. This connection of the Hinterkantengreiferwagens to the chains makes it possible in a range of sheet transfer and / or sheet transfer the Hinterkantengreiferwagen off and / or swing and / or move to move past this on an outer shell of a cylinder in the closed state with or without bow and / or before taking a bow by previous swinging and then swing and / or nachzueilen the sheet transfer to capture the sheet, or retire when depositing / deliver and / or to tighten the bow by a delay with subsequent gripper opening and / or store.

Further, the rear edge gripper system is hinged to a traction means rotatable, pivotable and / or displaceable and preferably controlled with an externally initiated movement.

The invention further advantageously allows the boom detection before leaving a cylinder, for example a printing cylinder or a transfer drum, in particular outside the traction means path with subsequent pivoting of the trailing edge gripper system. Alternatively, the arc detection of an already detected by another system arc can be done by lagging.

The sheet transfer area of the leading edge gripper system preferably corresponds to the sheet transfer area of the trailing edge gripper system, but may also deviate therefrom. In one embodiment of the invention, an ascending branch of the leading edge gripper system and the trailing edge gripper system is provided in a display on which the sheets to be transported are brought to the storage level of a delivery stack. In a preferred embodiment of the invention, however, the sheets are conveyed on an at least approximately horizontal sheet conveying path from a cylinder to over the sheet stack.

Advantageously, a relative movement of the trailing edge gripper system, in particular in the transport direction for detecting and in particular against the transport direction for delaying and finally depositing the sheet is generated. The sheet storage can be done advantageously by delaying the trailing edge gripper system with still recorded sheet and subsequent gripper opening for the sheet storage, in which case no additional storage system, such as suction rolls, suction rings, suction belts or Nachgreifer is needed. Alternatively, but also a filing of a sheet by delaying by means of a filing system done.

In the following, the invention will be explained by way of example. The accompanying drawings show schematically:

1a : Section of a delivery of a sheet-fed printing machine in one embodiment;

1b : Section of a delivery of a sheet-fed printing machine in a further embodiment;

2 : Connection of a rear edge gripper carriage to a chain of the chain conveyor system;

3a : Lagging of the trailing edge gripper carriage for detecting or taking over the sheet trailing edge;

3b : Trailing edge gripper carriage when detecting the sheet trailing edge;

4a : Deceleration of the sheet by the trailing edge gripper carriage after release of the sheet leading edge;

4b : Release of the sheet trailing edge by the trailing edge gripper carriage;

4c : Further deceleration and swinging away of the rear edge gripper carriage in the sheet storage.

The 1a shows in an embodiment of the invention, a section of a display of a sheet-processing machine, here a sheet-fed press. The printing press can be, for example, a sheet-fed offset rotary printing press in aggregate and series construction and contain elements not further illustrated, such as feeder, installation, several printing units and possibly coating units. The printing machine can be a straight printing press or be equipped as a perfecting press with a turning device. Between printing cylinders and transfer drums or transfertern the machine not shown are to be printed sheet 4 Passed at the front edge in the gripper closure and so transported to the delivery.

The printing press is preferably modular, with a last sheet guiding cylinder 1 the machine can be included in the frame of the delivery or the sheet guiding cylinder 1 a last sub-module of the machine can be assigned. Preferably, the sheet guiding cylinder forms 1 but an independent module. In this case, the axis of rotation of the sheet guiding cylinder 1 lie in a plane with axes of rotation of cylinders in the works of the machine or arranged above such a plane.

The sheet guiding cylinder 1 is here designed as a double-sized printing cylinder with an at least approximately closed lateral surface and downstream of a sheet transport system of a last printing, coating, finishing or drying plant of the printing press. For sheet transport contains the double-sized sheet guiding cylinder 1 in each case two diametrically arranged, lying in gripper channels gripper systems for fixing the sheet leading edges. The sheet guiding cylinder 1 not shown additional equipment can be assigned, the arc 4 For example, paint, inspect, mark, perforate, etc. Alternatively, the sheet guiding cylinder 1 be designed as a cylinder, drum, Transferter o. Ä., And be made single or multi-sized, with a single-sized cylinder at least one arc 4 maximum format can accommodate circumferentially.

The delivery contains here next to the sheet guiding cylinder 1 a sheet conveying system, comprising a first conveyor system with circumferentially feasible leading edge gripper systems and a second conveyor system with circumferentially feasible trailing edge gripper systems for taking over and conveying the sheet 4 from the sheet guiding cylinder 1 to a sheet pile, not shown. The first conveyor system with the peripherally guided front edge gripper systems is preferred as a chain conveyor system with circumferentially guided leading edge gripper carriage 2 educated. The second conveyor system with the peripherally guided rear edge gripper systems is preferred as a chain conveyor system with circumferentially guided rear edge gripper carriage 3 educated.

Both the first chain conveyor system with the circumferential leading edge gripper carriage 2 as well as the second chain conveyor system with the peripheral trailing edge gripper carriage 3 is for the transport of the bow 4 from the sheet guiding cylinder 1 arranged to the sheet stack above a horizontal plane, which is the upper generatrix of the sheet guiding cylinder 1 cuts. The sheet transport from the sheet conveying system takes place here exclusively on a horizontal sheet conveying path from the sheet guiding cylinder 1 until over the sheet pile. On the sheet conveying path to the stack of sheets, not shown additional equipment, such as dryers, powder dispensers, Entroller, etc. can be arranged, which during the sheet transport to the bow 4 act.

The first chain feed system for the sheet leading edges includes laterally arranged chains laid around sprockets 5 holding the leading edge gripper carriage 2 drive endlessly in an orbit. The second chain feed system for the sheet trailing edges also includes laterally arranged chains laid around sprockets 5 holding the rear edge gripper carriage 3 endlessly essentially on the orbit of the leading edge gripper carriage 2 drive. Preferably, the leading edge gripper carriages 2 and the trailing edge grab cars 3 around the sheet guiding cylinder 1 adjacent assigned sprockets out. Other sprockets, not shown, are arranged above the sheet pile. Here are the sheet guiding cylinder 1 associated sprocket pairs and located above the sheet stack sprocket pairs of chain conveyor systems coaxially but axially offset from one another. One of the sprocket pairs is assigned to a hollow shaft, within which a further sprocket pair supporting inner shaft is mounted. The inner shafts are rotatable relative to the hollow shafts.

The 1b shows in a further embodiment of the invention, a section of a display of a sheet-processing machine, here a sheet-fed press, with a first and a second chain conveyor system. The two chain conveyor systems also have here parallel to each other circumferential leading edge gripper carriage 2 and rear edge gripper carriage 3 on. The drive of the chain conveyor systems takes place here such that a chain conveyor system of a sheet guiding cylinder 1 associated sprocket pair is driven, while the other chain conveyor system is driven by the other sprocket pair. For example, the chains driven by the upper sprocket pair are running 5 a chain conveyor system to a arranged parallel to the lower sprocket pair deflection guide and arranged over a likewise not shown stack of sheets further deflection guide. The chains driven by the lower sprocket pair 5 of the other chain conveyor system run around a deflection guide above the sheet pile and about a parallel to the upper sprocket pair arranged Umlenkführung. Alternatively to a curve / groove over the sheet stack but could also be provided sprockets or pulleys.

The respective front edge gripper carriage 2 contain gripper systems for fixing the sheet leading edges, which are preferably designed as a clamping gripper. The respective rear edge gripper carriage 3 contain gripper systems for fixing the sheet trailing edges. These gripper systems can be designed as vacuum systems and / or clamping gripper systems. The rear edge gripper carriage 3 are to the leading edge gripper carriage 2 formatted adjustable.

Through the leading edge gripper carriage 2 become the bow 4 from the sheet guiding cylinder 1 taken over in the gripper conclusion. Through the rear edge gripper carriage 3 become the bow 4 taken over in a sheet transfer area, in the area of the upper generatrix of the sheet guiding cylinder 1 lies. Alternatively, the trailing edges but also spaced from the lateral surface of the sheet guiding cylinder 1 or on the way the bow 4 to the sheet pile through the trailing edge gripper carriage 3 be taken. It can be the bow 4 be stabilized or fixed in between by non-illustrated transfer systems in between.

The one of the leading edge gripper cars 2 at the leading edge and from the trailing edge gripper carriages 3 at the trailing edge fixed bow 4 are released over the stack of sheets for storage and attach to leading edge stops. To delay the bow 4 can be arranged a not shown filing system, which can be designed as Nachgreifer for gripping the sheet trailing edges or as a pneumatic sheet brake. Preferably, the bow 4 but also from delayed to the tray Hinterkantengreiferwagen 3 be braked, with no additional storage systems are needed.

The 2 shows a trailing edge gripper carriage 3 with the connection of the rear edge grab wagon 3 to the chain 5 , The rear edge gripper carriage 3 has gripper cuffs 6 on that with moving claw fingers 7 interact. In a gripping movement of the gripper fingers 7 becomes the trailing edge of the bow 4 against the gripper serves 6 fixed. A gripping motion of the gripper fingers 7 controlling drive, such as a curved roller transmission, is not shown here.

The rear edge gripper carriage 3 is the chains 5 both sides each with a first chain pin 8th cooperating first slot 10 and one with a second chain pin 9 cooperating second slot 11 assigned, which are arranged one behind the other in the sheet conveying direction BFR. Both long holes 10 . 11 have an extension oriented at least approximately in the sheet conveying direction BFR. The second slot 11 is curved. The curvature of the second slot 11 runs in Bogenförderrichtung BFR with a small radius of curvature to the gripper surcharges 6 supporting side of the rear edge gripper carriage 3 ,

The rear edge gripper carriage 3 is thus according to the slot geometry of the chain pin 8th . 9 guided in and against the sheet conveying direction BFR with respect to the chains 5 movable. About the chain pins 8th . 9 becomes the trailing edge gripper carriage 3 also safely guided in deflection areas, as by the suspension on sliding blocks Shortening in deflections (secants) are compensated.

The rear edge gripper carriage 3 is still a cam roller 13 associated, by means of a first coupling via a hinge point 12 is mounted on the gripper body. The cam roller 13 is still on a second coupling with the first chain pin 8th the chain 5 connected. The cam roller 13 is on the orbit of the trailing edge gripper carriage 3 at least partially a curve 14 associated with the cam roller 13 comes into contact. The curve 14 could simply be designed as a groove curve. A curve 14 is preferably in a sheet transfer area and / or in a Bogenübergabebzw. Sheet storage area provided. Further education can also be a closed along the orbit curve 14 be used. The cam roller 13 causes when shifting in the direction of the chains 5 a movement of the rear edge gripper carriage 3 over the first coupling and the second coupling against the sheet conveying direction BFR. When relocating the cam roller 13 from the chain 5 away is the trailing edge gripper carriage 3 in the sheet conveying direction BFR relative to the chain 5 relocated.

In the following figures, the movement of the gripper carriage in the sheet transfer area ( 3a and 3b ) and in the sheet transfer area ( 4a . 4b and 4c ), wherein the sake of clarity, the reference numerals has been omitted. The gripper carriage can be adapted to the requirements by means of suitable oblong hole geometries and moved correspondingly in one or in both areas relative to the sheet trailing edge.

The 3a shows a lagging of the rear edge gripper carriage 3 with respect to the sheet trailing edge for detecting this. The rear edge gripper carriage 3 moves here with open gripper fingers 7 by the rear edge gripper carriage 3 away-oriented curve 14 faster than the bow at the front edge 4 , The rear edge gripper carriage 3 is moved faster until the gripper system has reached the sheet trailing edge.

The 3b shows the trailing edge gripper carriage 3 in terms of the chain 5 immutable position. As soon as the sheet trailing edge is in the area of the gripper system, it is fixed by the gripper system. The rear edge gripper carriage 3 has safely detected the sheet trailing edge. Slight bow tightening is also possible.

The 4a shows a delaying of the bow 4 through the rear edge gripper carriage 3 after release of the sheet leading edge in the sheet storage area. The to the chain 5 directed curve 14 leaves the trailing edge gripper carriage 3 slower than the chain 5 circulate. The rear edge gripper carriage 3 is thus delayed. The rear edge gripper carriage 3 holds the sheet trailing edge further fixed, so that the bow 4 is braked against the chain speed.

The 4b shows the release of the sheet trailing edge for sheet storage by the maximum delayed trailing edge gripper carriage 3 , The release takes place by opening the gripper of the rear edge gripper carriage 3 in the ideal storage point above the sheet pile. The curve 14 is on to the chain 5 directed so that the second chain pin 9 with further slight deceleration of the rear edge gripper carriage 3 in the curvature region of the second elongated hole 11 of the rear edge gripper carriage 3 passes.

The 4c shows the weggeschwenkten from the sheet transport path Hinterkantengreiferwagen 3 for an unobstructed sheet storage. By the in the radius of curvature of the second elongated hole 11 guided second chain pin 9 are also the gripper fingers 7 lifted from the sheet transport plane, so that the slower falling bow 4 without touching the gripper fingers 7 can take off.

The mode of action: By an actuator, for example by the cam control, the Hinterkantengreiferwagen 3 relative to the sheet trailing edge moved so that a takeover and / or a transfer can be done without interference.

LIST OF REFERENCE NUMBERS

1

 Sheet guiding cylinder

2

 Leading edge gripper carriages

3

 Trailing edge gripper carriages

4

 bow

5

 chain

6

 gripper

7

 gripper fingers

8th

 first chain pin

9

 second chain pin

10

 first slot

11

 second slot

12

 fulcrum

13

 follower

14

 Curve

BFR

 Sheet conveying direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4119188 C1 [0002]
• DE 102007061394 A1 [0003]

Claims (10)

Delivery device of a sheet-processing machine with a sheet conveying system for transporting sheets ( 4 ) to a sheet stack, wherein a first conveyor system with circumferentially feasible leading edge gripper systems and a second conveyor system with circumferentially feasible trailing edge gripper systems is provided, with which the sheets ( 4 ) are fixed to the leading edge and trailing edge can be conveyed to the sheet stack, characterized in that a respective trailing edge gripper system on a traction means track is feasible and partially formed with respect to the traction means displaced, pivoted and / or displaceable. Apparatus according to claim 1, characterized in that the trailing edge gripper system is connected via slots with the traction means. Apparatus according to claim 1 or 2, characterized in that a slot has a curvature. Apparatus according to claim 2 or 3, characterized in that the oblong holes of the trailing edge gripper system are arranged such that the trailing edge gripper system with respect to the traction means is rotatable, pivotable and / or displaceable. Device according to at least one of the preceding claims, characterized in that the trailing edge gripper system is displaceable, pivotable and / or displaceable by mechanical adjusting means relative to a traction means. Device according to at least one of the preceding claims, characterized in that the trailing edge gripper system has a cam roller ( 13 ) and this cam roller ( 13 ) is rotatably mounted on a trailing edge gripper system via a coupling. Apparatus according to claim 6, characterized in that the cam roller ( 13 ) is connected via a further coupling with the traction means. Apparatus according to claim 6 or 7, characterized in that in a region of a sheet transfer and / or in an area of a sheet transfer with the cam roller ( 13 ) is provided cooperating cam element. Device according to at least one of the preceding claims, characterized in that the conveyor system with the circumferentially feasible trailing edge gripper systems as a chain conveyor system with circulating driven chains ( 5 ) is trained. Method for transporting sheets ( 4 ) in a delivery of a sheet-processing machine to a sheet stack, wherein a first conveyor system with circumferentially guided leading edge gripper systems and a second conveyor system with circumferentially guided rear edge gripper systems is provided, with which the sheets ( 4 ) at the leading edge and trailing edge are conveyed to the sheet stack, characterized in that the trailing edge gripper systems are guided such that they follow a traction means and in a region of a sheet transfer and / or in a range of sheet transfer relative to the traction means displaced, pivoted and / or moved become.

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