DE102015226330B4 - Display for a sheet processing machine - Google Patents

Abstract

Display for a sheet-processing machine,
with peripherally driven front edge gripper carriage (4) for taking over the sheets at the front edge and for transporting the sheets to a stacking area and / or
with circumferentially drivable rear edge gripper carriage (5) for fixing and transporting the sheets at the trailing edge,
wherein a Nachgreifersystem (11) for taking over the sheet trailing edges of the stacking area with respect to a sheet running direction (BLR) is arranged upstream,
wherein the Nachgreifersystem (11) has at least one gripper system (15) which is rectilinearly guided in an area immediately adjacent to the stacking area and
wherein the gripper system (15) experiences a reversal of direction on one and the same guideway,
the gripper system (15) being movable between a first position and a further position, the two positions being vertically spaced from each other,
characterized in that the Nachgreifersystem (11) alternately drivable deflection wheels (13) which are in operative connection with a with the gripper system (15) connected to the traction means.

Description

The invention relates to a display for a sheet-processing machine.

From the DE 643 980 A is a delivery device for sheet-fed presses known in which the sheet trailing edges are delayed by Nachgreifer. The Nachgreifer are doing straight in a carriage guide by means of a connecting rod back and forth. A disadvantage of this solution is that subsequent sheets can be damaged because the Nachgreiferrückbewegung takes place on the sheet conveying plane.

The DE 103 43 428 A1 . DE 10 2009 007 865 A1 and DE 10 2004 042 511 A1 each disclose a display for sheet-processing machines with a rear and front edge gripper carriage, wherein additionally a further, vertically movable gripper system is arranged.

The invention is therefore based on the object to improve the sheet transport and / or the sheet storage in a sheet-processing machine on.

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

The invention has the advantage that the sheet transport and / or the sheet storage in the display, in particular the Doppelgreiferauslage, a sheet-processing machine is further improved.

In particular, a trailing edge gripper is used, which is preferably driven by a chain transmission. In particular, a linear drive of the gripper system of the trailing edge gripper takes place at least in the region of the stack trailing edge. The gripper system can be designed as a vacuum cleaner and / or as a clamping gripper. The drive of the gripper system is particularly preferably via a forward and reverse running, for example, a chain carriage. For example, a motor can cause the forward and / or reverse, which is advantageously designed highly dynamic and / or electronically controlled.

In particular, results from the linear drive a flat design, which is advantageous when using a non-stop blinds for a non-stop operation in the display.

Further education, it is possible to provide a combination of the Nachgreifersystems with a pneumatic sheet brake. For example, the Nachgreifersystem in combination with at least one rotating or rotating brake element, such as a suction belt operated. It is possible to provide a gripper system of the Nachgreifersystems at least centrally with respect to the sheet width, while laterally only suction belts are arranged. The Nachgreifersystem can be designed to format setting separately or together with the sheet brake elements displaced.

In a preferred embodiment, it is provided to carry out the gripper system of the Nachgreifersystems as a forceps gripper, in particular with trailing edge stop for catching the respective end of the sheet. For example, a sheet storage after a delay, for example, with zero speed (v = 0), also take place with an additional path in the direction of stack.

In one embodiment, a display may be provided, which has only front edge gripper carriage, with which the sheets are transported to the stack area, in particular to a delivery stack. For example, the acquisition of the sheet at the leading edge in a range of sprocket main shaft and the transport along an ascending branch or horizontally, in particular exclusively horizontal, take place. The sheet leading edges can be released from the leading edge gripper carriage over the stack area or fed to a leading edge Nachgreifersystem. The sheet trailing edges can be trapped by Nachgreifersystem or fixed by a catcher device fed Nachgreifersystem for sheet delay.

Preferably, a Doppelgreiferauslage is used with front edge gripper carriage for fixing the sheet leading edges and trailing edge gripper carriage for fixing the sheet trailing edges. The sheets can be guided in such a Doppelgreiferauslage along an ascending branch, but are preferably horizontally and particularly preferably transported only horizontally from a sheet guiding cylinder, in particular a storage drum, to the stacking area and preferably to an outfeed stack. The trailing edge gripper carriages can transfer the sheet trailing edges to the trailing edge gripper system, in particular in the gripper closure. The leading edge gripper carriages can also be guided on a different path than the trailing edge gripper carriages. For example, the leading edge gripper carriages, at least in the region of the gripper system, can be guided further above, that is, further apart from the gripper system, than the trailing edge gripper carriages, so that a risk of collision with the gripper system is further reduced.

• 1: Ausschnitt einer bogenverarbeitenden Maschine mit einer Doppelgreiferauslage;
• 2: Nachgreifersystem zur Übernahme der Bogenhinterkanten;
• 3: Greifersystem des Nachgreifersystems;
• 4: Geschwindigkeitsverlauf des Greifersystems zur Übernahme und Verzögerung eines Bogens.

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

• 1 : Section of a sheet-processing machine with a double gripper delivery;
• 2 : Post-gripper system for taking over the sheet trailing edges;
• 3 : Gripper system of the post-gripper system;
• 4 : Speed of the gripper system for taking over and delaying a bow.

The 1 shows a section of a sheet-processing machine, such as a sheet-fed press, here in particular a Bogenoffsetrotationsdruckmaschine, with a Doppelgreiferauslage 1 , The printing press may be, for example, a sheet-fed press in aggregate and series construction and not shown elements such as feeder, plant, several printing and possibly coating plants, finishing and / or drying plants included. Additionally, the machine may include turning means for turning the sheets for backside printing. The turning device can be designed in particular as a single-drum turn or as a three-drum turn for a trailing edge turn. The machine can continue to have dryers, for example, in the factories.

In the machine to be printed sheets of cylinders are promoted and passed in a gripper closure between the cylinders. The sheets are thus clamped on the front edge on the lateral surfaces of the rotating cylinder up to the double gripper delivery 1 transported. In the double gripper display 1 The sheets are taken from conveyor systems with endless rotating gripper systems and fixed to the leading edge and trailing edge up to a stacking area, for example, up to a pile support plate promoted. Above the pile support plate are the sheets to form a delivery stack 6 Approved. The pile support plate is lowered vertically by a lifting drive depending on the incoming sheet.

The printing press is preferably of modular construction, wherein a sub-module of the last machining unit of the machine is a printing cylinder 2 and can accommodate a subordinate sheet transfer system. The printing cylinder 2 has, for example, an at least approximately closed lateral surface. After the printing cylinder 2 the last work, such as a last printing or coating unit, the sheets from the sheet transfer system to a downstream sheet guiding cylinder 3 to hand over. The sheet transfer system may be interchangeably associated with the machine or adapted to the equipment of the machine.

That between the impression cylinder 2 the last processing plant and the sheet guiding cylinder 3 arranged sheet transfer system can, for example, in an equipment of the machine as perfecting machine as a transfer drum 7 be educated. The transfer drum 7 contains at least shroud segments for carrying the sheet to be transported. The transfer drum 7 preferably contains pivotable arch support surfaces for guiding the sheet flat. Further education is on the transfer drum 7 a coating can be arranged. As a cover, for example, a removable jacket or drum caps can be used. Through the transfer drum 7 The sheets are at the leading edge of the upstream printing cylinder 2 taken over and the downstream sheet guiding cylinder 3 to hand over. The sheet transport can in particular, as shown here further education, by a pneumatically actuated sheet guide 8th get supported.

Alternatively, in an equipment of the machine as a straight printing machine, the sheet transfer system between the impression cylinder 2 the last processing plant and the sheet guiding cylinder 3 be designed as Transferter without lateral surface elements, through which the sheet at the front edge of the upstream printing cylinder 2 taken over and the downstream sheet guiding cylinder 3 be handed over. In an equipment of the machine as a perfecting press with a coating unit, in particular dispersion varnish, formed last processing unit, the sheet transfer system for sheet transport as a Bogentragsegmente, for example, formed as a support or suction discs, having sheet guiding device may be formed. The Bogentragsegmente can be axially adjustable and, for example, touch only pressure-free sheet edges.

The sheet transfer cylinder downstream of the sheet transfer system 3 may be stored in a last modified sub-module of the machine. Alternatively, the sheet guiding cylinder 3 be assigned to the last sub-module or it can be an enlarged sub-module of the last processing plant are used or the sheet guiding cylinder 3 be included in the delivery rack. The axis of rotation of the sheet guiding cylinder 3 can in a plane with axes of rotation of cylinders, in particular pressure cylinders 2 , lie in the works of the machine or arranged above such a plane. Further, the sheet transfer system and / or the sheet guiding cylinder 3 cooperate with additional equipment.

Preferably, the sheet guiding cylinder 3 a smoothing device 10 assigned to the sheet conveying path of the sheet guiding cylinder 3 acts. In this case, the smoothing device 10 pneumatic openings and / or vanes, such as baffles have. The smoothing device is preferred 10 the contour of the sheet guiding cylinder 3 adjusted, with the smoothing device 10 particularly preferably extends to the upstream sheet transfer system. Next, the smoothing device 10 in the direction of rotation of the sheet guiding cylinder 3 have an increasing nozzle density. As an alternative, inspection systems, powdering devices, inkjet and other marking systems, cutting, embossing and ionizing devices, counting devices, numbering devices, cold foil devices, as well as dryers or sheet discharge devices may be provided as an alternative to the sheet guiding cylinder 3 can also be assigned in standardized interfaces.

The rotating sheet conveying systems or cylinders, in particular the impression cylinder 2 and the transfer drum 7 the last processing plant and this downstream sheet guiding cylinder 3 , are preferably formed as double-sized systems, which each contain two diametrically arranged gripper systems for fixing the sheet leading edges for the sheet transport. The lateral surfaces having sheet conveying systems can have open or coverable gripper channels, which extend in particular axially over the cylinder width. Alternatively, however, the sheet conveying systems can also be single or multiple-sized, with a single-sized system capable of accommodating at least one sheet of maximum format on the periphery.

Preferably, that of the Doppelgreiferauslage 1 immediately preceding sheet guiding cylinder 3 as a double-sized storage drum 3 be formed, which has format adjustable, comb-like intermeshing shell segments. From the storage drum 3 The sheets are held at the leading edge and trailing edge by sheet fuser systems. By relative movement of Bogenfixiersysteme each other, a respective sheet on the storage drum 3 or aligned during sheet transfer and / or streamlined longitudinally or transversely.

The double gripper delivery 1 Contains one with the sheet guiding cylinder 3 For example, the storage drum 3 , cooperating and this immediately downstream leading edge transport system with circumferentially feasible gripper systems for sheet leading edges and a trailing edge transport system with circumferentially feasible gripper systems for sheet trailing edges for taking over and conveying the sheet from the sheet guiding cylinder 3 to the stack area, in particular to the delivery stack 6 , The leading edge transport system is here as a chain conveyor system with circumferentially guided leading edge gripper carriage 4 and the rear edge transport system as a chain conveyor system with circumferentially guided rear edge gripper carriage 5 educated. Each chain conveyor system includes laterally arranged guided in guide rails chains. The leading edge grab cars 4 and / or the Hinterkantengreiferwagen 5 are arranged in particular parallel to each other and evenly spaced from each other between the respective chains. The leading edge grab cars 4 and / or trailing edge gripper carriage 5 can each be on both sides via gripper carriage plates 13 be assigned to the chains.

Preferably, the leading edge transport system and the trailing edge transport system each include the sheet guiding cylinder 3 adjacent front pair of sprockets 9 and one above the delivery stack 6 arranged rear pair of sprockets 9 , The sprockets 9 from the leading edge transport system and the trailing edge transport system can be arranged coaxially and axially offset from each other. Between the sprockets 9 The chains preferably move exclusively in horizontal guide rails. In an alternative embodiment, only front or rear sprockets can 9 and further Kettenumlenkführungen be used. Next alternatively but also sprockets 9 be arranged eccentrically offset from each other. In a further alternative embodiment, the two front pairs of sprockets 9 or deflecting guides are arranged such that the leading edge gripper carriage 4 and / or trailing edge gripper carriage 5 the deflection in the Bogenübemahme from sheet guiding cylinder 3 have left and are already on the straight, preferably horizontally extending chain section. Possibly occurring vibrations of the leading edge gripper carriage 4 and / or trailing edge gripper carriage 5 when leaving the deflection are largely subsided. The sprockets 9 or deflection guides can inner and / or outer supports for guiding the leading edge gripper carriage 4 and / or trailing edge gripper carriage 5 be assigned in the deflection.

Both the front edge transport system and the rear edge transport system are preferred for transporting the sheets from the sheet guiding cylinder 3 to the delivery pile 6 arranged above a horizontal plane, which is the upper generatrix of the sheet guiding cylinder 3 affected. The sheet transport through the leading edge gripper carriage 4 and / or trailing edge gripper carriage 5 in particular takes place exclusively on a horizontal sheet conveying path from the sheet guiding cylinder 3 in Sheet travel direction BLR to over the delivery pile 6 What makes bowing much easier. The horizontal sheet transport path allows the leading edge gripper carriages 4 and / or the Hinterkantengreiferwagen 5 to be supported in the deflection region in particular from the outside. As a result, the stresses and deformations occurring by centrifugal forces can be reduced, which allows the use of relatively small deflection radii and / or the use of low gripper carriage heights. Lower gripper carriage heights enable a smaller and therefore much more effective dryer distance.

For the sheet transport contain the leading edge gripper carriage 4 Gripper systems for fixing the sheet leading edges, which are preferably designed as a clamping gripper. The rear edge gripper carriage 5 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 5 are in a known manner phase adjustable to the leading edge gripper carriage 4 designed so that different sheet formats can be used at the front and rear edge. Through the leading edge gripper carriage 4 The sheets are approximately at the upper generatrix of the sheet guiding cylinder 3 taken over in the gripper conclusion. Through the rear edge gripper carriage 5 The sheets are also from the sheet guiding cylinder 3 accepted. Alternatively, the trailing edges but also spaced from the lateral surface of the sheet guiding cylinder 3 or on the way the bow to the delivery pile 6 through the rear edge gripper carriage 5 be taken. The sheets can also be stabilized and / or fixed by transfer systems, not shown in between. On the Bogenförderweg to the delivery pile 6 Additional equipment, such as dryers and / or powder devices can be arranged, which act on one or both sides of the sheet during sheet transport. It may also be arranged below the Bogenförderweges more powder devices, Entroller, etc.

The one of the leading edge gripper cars 4 at the leading edge and from the trailing edge gripper carriages 5 Arches fixed at the trailing edge are over the delivery pile 6 released for storage and attach to leading edge stops. Further, rear and / or side edge stops can be provided, which can form a storage slot together with the leading edge stops. To delay the sheet, a not shown filing system can be arranged, which can be designed as Nachgreifer for gripping a sheet edge or as a pneumatic sheet brake. Preferably, however, the storage system is designed as a forceps gripper, which is the trailing edge of the sheet from the respective trailing edge gripper carriage 5 in gripper conclusion takes over, decelerates and on the delivery pile 6 stores. Pressure-free corridors are not necessary.

The 2 shows a post-gripper system 11 for taking over a sheet trailing edge in a display of a sheet processing machine, such as a Doppelgreiferauslage 1 as described above. The post-gripper system 11 is the delivery pile 6 upstream with respect to the sheet running direction BLR. The post-gripper system 11 comprises a translatory, in particular linear or rectilinear, movable gripper system 15 , which is immediately before the delivery pile 6 straight in and against the sheet travel direction BLR is displaced. The gripper system 15 is in particular in the sheet running direction BLR up to the trailing edge of the delivery pile 6 movable, for example to between trailing edge stops 12 at the trailing edge of the delivery pile 6 ,

The post-gripper system 11 has one or two pulleys 13 on, which can lead or drive a traction device. The traction means is preferably as a chain 14 educated. The post-gripper system 11 can also several, for example, arranged over the sheet width to divert wheels 13 guided chains 14 exhibit. At least one chain 14 is the gripper system 15 via at least one, preferably a plurality, for example two connecting means, for example rigid connecting links 16 , assigned. One or both pulleys 13 can be assigned to a drive, the respective deflection wheel 13 can drive rotationally in both directions. For example, a deflecting wheel 13 be associated with an electronically controlled motor, the deflection wheel 13 alternately in both directions of rotation about an axis of rotation of the deflection wheel 13 drives.

About the drive of the or the deflection wheels 13 Will that be over the pulleys 13 Guided traction means, in particular the chain 14 , also alternately, in particular in and against the sheet running direction BLR, linearly and rectilinearly driven. In particular, this is via the connecting means, in particular the connecting members 16 , with the chain 14 connected gripper system 15 driven in the region of the stack trailing edge on a linear preferably horizontally oriented travel. At format setting 21 can, for example, the complete Nachgreifersystem 11 be shifted in or against the sheet travel direction BLR, so that the gripper system 15 always immediately the stack trailing edge of the delivery stack 6 assigned.

Shown here is a gripper system 15 in different positions. In a first position, from the delivery pile 6 furthest apart, the gripper system may become 15 in a quiet location. In the first position of the gripper system 15 this is preferably performed deviating from the linear or linear guide. The gripper system 15 thus has in this position a guide which is vertically spaced from the delivery stack 6 facing straight-line leadership is. In particular, a guidance of the gripper system 15 below the sheet transport plane, so that leading edge gripper carriage 4 or leading edge gripper carriage 4 and rear edge gripper carriage 5 can happen. In a second position, which is displaced in the sheet running direction BLR, it is possible to take over a sheet trailing edge, for example from a trailing edge gripper carriage 5 done in the gripper closure. In this second position has the gripper system 15 reached at least approximately machine speed, ie the gripper system 15 moves at least briefly evenly, for example, with the trailing edge gripper carriage 5 in sheet travel direction BLR. In the third position of the gripper system following in the sheet running direction BLR 15 immediately adjacent to the delivery pile 6 indicates the gripper system 15 a speed below the machine speed, for example a speed of zero. In this third position, the gripper system can 15 at least with its tip also between the trailing edge stops 12 are located. From sheet transfer to sheet release, the gripper system 15 thus exclusively linear and preferably horizontally guided.

The 3 shows a gripper system 15 of the post-gripper system 11 in more detailed view. Other gripper systems 15 of the post-gripper system 11 can be the same. The gripper system 15 is via the links 16 from the chain 14 , which can also be guided in guides, driven. At least in the delivery pile 6 facing portion is a linear or rectilinear preferably horizontal movement of the gripper system 15 , The gripper system 15 here preferably has an upper gripper 17 and a lower gripper 18 on, which are hinged together. The upper gripper 17 and the lower gripper 18 For example, at one of two links 16 held together trusser be rotatable. Both the upper gripper 17 as well as the lower gripper 18 can be extended over the common pivot point and held by a spring element, in particular a compression spring in the closed state. When closed, the upper gripper touch each other 17 and the lower gripper 18 at contact surfaces.

For opening the gripper system 15 , in particular for separating the contact surfaces of upper gripper 17 and lower gripper 18 , opening means are provided. In particular, these opening means can be a curved path 20 and one on this curved track 20 incoming cam roller 19 include. A curved track 20 is to take over a sheet trailing edge, for example, the trailing edge gripper carriage 5 , and to release the sheet trailing edge in the region of the delivery pile 6 , for example between the trailing edge stops 12 , intended. The cam roller 19 can via a lever, which, for example, via intermediate links with the upper gripper 17 and the lower gripper 18 communicates, the gripper system 15 to open.

The 4 shows a velocity profile of a gripper system 15 for taking over and delaying a sheet trailing edge. In a position located below the sheet conveying plane (for example in the first position according to FIG 2 ) has the gripper system 15 a speed of zero. From this rest position is the gripper system 15 accelerates in the sheet running direction BLR, wherein this overcomes a vertical distance upwards and in particular to the height of a rear edge gripper carriage 5 is guided. The gripper system 15 is or will be from the opening means, for example by running the cam roller 19 on a curved path 20 , open. In particular, the gripper system 15 thereby at least approximately accelerated to machine speed, so that the sheet trailing edge can be fixed, for example by running the cam roller 19 from the curved path 20 , At the same time or slightly delayed, the trailing edge gripper carriage 5 release the sheet trailing edge.

This is followed by a delay of the gripper system 15 , in particular by the motor, on a preferably exclusively linear or linear and particularly preferably horizontal guide section, so that in the region of the delivery stack 6 over the opening means, in particular the cam roller 19 on a curved path 20 , an opening and thus release of the sheet trailing edge can be done. Subsequently, the gripper system 15 against the sheet running direction BLR first moves on the rectilinear or linear section and then with a vertical component to below the sheet conveying plane, so that the gripper system 15 resumes its original resting position. Subsequently, a new sheet delay process can be performed.

LIST OF REFERENCE NUMBERS

1

Double Gripper position

2

pressure cylinder

3

Sheet guiding cylinder, storage drum

4

Leading edge gripper carriages

5

Trailing edge gripper carriages

6

delivery pile

7

Transfer drum

8th

sheet guide plate

9

sprockets

10

smoothing

11

Nachgreifersystem

12

Rear edge stop

13

guide wheel

14

Chain

15

gripper system

16

link

17

upper gripper

18

lower gripper

19

follower

20

cam track

21

format adjustment

Claims (7)

Display for a sheet-processing machine, with peripherally driven front edge gripper carriage (4) for taking over the sheets at the leading edge and for transporting the sheets to a stacking area and / or with circumferentially drivable trailing edge gripper carriage (5) for fixing and transporting the sheets at the trailing edge, wherein a Nachgreifersystem (11) for taking over the sheet trailing edges of the stacking area with respect to a sheet running direction (BLR) is arranged, wherein the Nachgreifersystem (11) at least one gripper system (15), which in a stack region immediately adjacent area is rectilinearly feasible and wherein the gripper system (15) on one and the same guideway undergoes a reversal of direction, wherein the gripper system (15) between a first position and another position is movable, wherein the two positions are vertically spaced from each other, characterized in that the Nachgreifersystem (11) alternately driven Umlen having wheels (13) which are in operative connection with a traction means connected to the gripper system (15). Display after Claim 1 , characterized in that the gripper system (15) adjacent to a delivery stack (6) is exclusively rectilinear and / or horizontally feasible. Display according to at least one of the preceding claims, characterized in that the gripper system (15) has an upper gripper (17) and a lower gripper (18) and both grippers (17, 18) are closable by a spring element. Display according to at least one of the preceding claims, characterized in that the gripper system (15) has a arranged on a lever, with a cam track (20) cooperating cam roller (19) for opening the gripper system (15). Display according to at least one of the preceding claims, characterized in that the Nachgreifersystem (11) comprises a motor with which the gripper system (15) is driven alternately between two directions of movement. Display according to at least one of the preceding claims, characterized in that in addition to the gripper system (15) is provided a pneumatically acting sheet brake element, which is arranged in the machine width direction adjacent to the gripper system (15). Delivery according to at least one of the preceding claims, characterized in that the Nachgreifersystem (11) in Formatinstellung (21) in or against the sheet travel direction (BLR) is displaced.

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