EP4355674A1

EP4355674A1 - Stack insertion means having support rollers and a tip, delivery means, sheet-processing machine and method for changing stacks

Info

Publication number: EP4355674A1
Application number: EP23724703.6A
Authority: EP
Inventors: Volker Kessler; Marko SPRINGER
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 2022-06-10
Filing date: 2023-05-02
Publication date: 2024-04-24
Also published as: WO2023237255A1; DE102022114618A1; CN117836227A

Abstract

The invention relates to a stack insertion means (09) having rotationally drivable support rollers (10) for sheets to be picked up, which support rollers extend over the width of the stack insertion means (09), and having a box-like reinforced tip which is mounted upstream of the support rollers (10) in the insertion direction (T). The box-like reinforced tip is designed as a box profile (11) through which a plurality of rollers (12) pass.

Description

Stack insertion with support rollers and a tip, delivery, sheet processing machine and method for stack changing

The invention relates to a stacking insert for a sheet processing machine with rotationally drivable support rollers for sheets to be picked up that extend over the width of the stacking insert and with a box-shaped reinforced tip in front of the support rollers in the insertion direction, a delivery with such a stacking insert, a sheet processing machine with a delivery with a such a stack insert and a method for changing stacks on a sheet processing machine with a stack insert.

Non-stop roller blinds in the delivery of sheet-fed printing machines have the task of storing the sheets printed during a stack change until an empty pallet is available on the stack support plate to receive these sheets, the so-called auxiliary stack. Due to ever higher printing speeds, the stack heights and weights of the auxiliary stacks have increased significantly in recent years. This results in severe deformation of the elements of the non-stop roller blinds.

Particularly high loads affect the tip of the non-stop roller blind. While as the auxiliary stack slowly grows, its weight is distributed relatively evenly across all areas of the blind (i.e. on the tip and the following rollers) and thus leads to uniform deformations. When the blind is pulled back, the auxiliary stack often tips over the top of the blind. Depending on the printing material, in extreme cases the weight of the entire auxiliary stack can even briefly act on the top of the roller blind. This often leads to plastic deformation and destruction of the components. From a procedural perspective, it still makes sense to keep the height of the elements of a non-stop roller blind as low as possible. It is desirable to equip the roller blind tip with as much rigidity as possible with a height of, for example, approx. 30 mm, i.e. to make it significantly stiffer than the following rollers, preferably with the same diameter. From a process engineering point of view, it is also advisable to provide the non-stop roller blind with a tip, as this makes it easier to move into a gap between two falling sheets. In the past, such very delicate tips were placed in front of the first roll and were therefore often damaged.

An attempt was also made to replace the first roller and the upstream tip with a closed box made of 4 mm sheet steel, the contour of which also includes a tip. Although this solved the problem of excessive deformation, it revealed the lack of the first roller. When tipping over the tip, the auxiliary stack rested primarily on the retracting box profile for a short time and was moved against the direction of sheet travel.

DE 1 145637 A shows an auxiliary stacking device for use in the storage space of a sheet processing machine with a support member that can be inserted into the stacking space and has a flexible covering that is guided around displaceable deflection rollers and is attached to the machine frame at both ends, the deflection rollers and any others Support rollers are held laterally by chains, which run along their path in closed guides, the chains also forming a chain drive together with a drive sprocket that engages directly in them.

The US 3,341,032 A shows an auxiliary device for dividing stacks of sheets and for facilitating the introduction of separating rods in continuously operating sheet feeders, with a stacking wedge being equipped on its upper and lower back with one or more self-contained endless rows of balls, one side of which Row of balls on the back of the wedge is open so that the balls come into contact with the bow and the other side of the same row of balls is sunk into the back of the wedge so that it does not come into contact with the bow or stacking surface.

GB 2 417 027 A shows a support rod for a blank processing machine with bearing means which protrude beyond its top and bottom, allowing blanks picked up above and below the rod to roll over its top and bottom.

From DE 102 49 034 C1 an intermediate stacking device in the delivery of a sheet processing machine, in particular a printing press, is known, with an intermediate stack carrier which can be retracted into the stacking area and extended out of the stacking area in the opposite direction to the entry direction, which consists of articulated, rotatable support rollers which can be guided in guides are arranged, is formed, the frontmost support roller in the retraction direction being designed with a reduced diameter with respect to the remaining support rollers, the guides being designed such that during retraction or extension, the arch-bearing surface line of the frontmost support roller in the retraction direction is at a height level below the Height levels of the arch-bearing surface lines of the other support rollers are moved, and in the retracted state of the intermediate stack carrier, the arch-bearing surface lines of all support rollers run at the same height level.

From DE 102006 001 582 A1 a boom insertion, in particular auxiliary stacking device, is known, with a front roller arrangement located at the front in the insertion direction, a middle roller arrangement, a rear roller arrangement, and a coupling device for coupling the roller arrangements to form an overall displaceable unit, the front Roller arrangement is formed by one or more rollers mounted on both sides, the diameter of which is smaller than the thickness of the boom insert itself, measured perpendicular to the support surface. From DE 102013214 531 A1 a sheet processing machine, a method for picking up at least one sheet area with a support structure and a use of a traction means for driving a drivable element of a support structure are known, with means being provided with which a drivable element that comes into contact with the sheet can be driven during the movement of the support structure in such a way that a contour of the element that comes into contact with the arch has a relative movement to the arch.

The invention is based on the object of creating an alternative stack insertion or an alternative method for stack changing and, in particular, of further improving the stack changing process on sheet processing machines.

The object is achieved according to the invention by the features of an independent claim.

The advantages that can be achieved with the invention are, in particular, that an alternative stack insertion or an alternative method for stack changing is created and in particular the stack changing process on sheet processing machines is further improved. In particular, a non-stop roller blind with a reinforced tip is created. A corresponding delivery or sheet processing machine with a delivery with such a stacking insert is also provided. At this point, all embodiments of the invention disclosed in the claims of the documents originally submitted are explicitly included in the description.

In a preferred embodiment of a non-stop roller blind, a box-shaped hollow profile with an internal shaft is provided as the tip, which is driven, for example, via a pinion with a rack, preferably on the drive side of the machine. There are rollers on the shaft, which in particular have the same diameter as have the following rollers (for example 30 mm) and are driven in the same way as the following rollers when moving the non-stop roller blind. The two necessary construction elements, which are housed in the same installation space in a manner of mutual penetration, enable both a rigid box and driven rollers as far forward as possible at the tip.

The box profile can be designed in such a way that it can occupy two different positions in the room. When entering the stack, for example in the transport direction or sheet travel direction, the tip can preferably be inclined downwards. Shortly before reaching the end position, the box profile can, for example, move onto a curve so that the tip is raised and the sheets of the auxiliary stack are supported as close as possible to the leading edge of the sheet.

In particular, all of the rollers of the non-stop roller blind rotate when moving in and out in such a way that there is no relative movement at the point of contact with the paper and the sheets are therefore not moved when the roller blind is extended or extended. This is achieved, for example, by a rack and a pinion attached to the non-stop roller blind, which is attached to the individual rollers.

In order to further improve the pulling out of the roller blind from under the auxiliary stack, small, preferably non-driven, support rollers can be attached to the tip, for example over the entire width of the box profile. Alternatively or additionally, non-driven rollers, so-called ball rollers, can also be embedded on the top in the box profile.

The special design of the tip, which on the one hand has the high rigidity of a closed box profile and on the other hand has driven rollers, advantageously prevents the auxiliary stack from tearing, especially when extending the non-stop roller blind. In particular, the rigidity of the roller blind tip considerably improved. This means that even higher auxiliary stacking weights can be managed without causing damage to the assembly.

An exemplary embodiment of the invention is shown in the drawings and is described in more detail below.

Show it:

Fig. 1 shows a delivery of a sheet processing machine with a non-stop device;

Fig. 2 is a perspective view of a non-stop roller blind with a tip;

Fig. 3 is a sectional view of the tip of the non-stop roller blind.

1 shows, for example, the stacking area of a delivery 01 of a sheet-processing machine, for example a sheet-fed printing machine, in particular a sheet-fed offset rotary printing machine, preferably in an aggregate and row design, in which the processed, for example printed and/or varnished, sheets are deposited. To transport the sheets from a last processing station, in particular a last printing or coating unit, of the machine, rotating transport systems are preferably used, for example gripper carriages 02 carrying clamping grippers, of which the sheets are transported fixed at their front edges in the transport direction T to the stacking area. The transport systems are designed here, for example, as chain transport systems with two delivery chains guided laterally on the frame of the display 01, between which the gripper carriages 02 are arranged. From the delivery chains, the gripper carriages 02 are guided in particular continuously on a gripper carriage track in the transport direction T to the stacking area or over a delivery stack 03, where the gripper carriages 02 carry the sheets for storage release.

In the delivery 01, sheet guide plates, not shown, can be arranged below the sheet transport path, which guide the sheets on the way to the delivery stack 03. Such sheet guide plates preferably have at least approximately closed surfaces for sliding and/or floating guidance of the sheets. Preferably, the sheet guide plates can be assigned nozzle openings, in particular Venturi nozzles, for pneumatic guidance of the sheets. The machine can also have a turning device and can preferably be designed to be switchable between the face printing and face and reverse printing operating modes. An air cushion can be formed between the sheet guide plates and the sheets transported over them, especially in the perfecting and reverse printing mode.

In the stacking area of the delivery 01 there is a stack support plate 04 which can be moved vertically by a stack lifting device (not shown) and which can, for example, carry a pallet 05 for receiving the sheets to be displayed. Above or in the stacking area, in particular above the stack support plate 04, the grippers of the gripper carriages 02 open and release the sheets so that they sink, for example, onto the pallet 05 arranged on the stack support plate 04 under the effect of gravity. Above the delivery stack 03, blowing means, for example a blowing frame, preferably with axial fans, can be arranged, which support the depositing movement of the sheets released by the gripper carriages 02.

In the delivery 01, the delivery stack 03 is preceded by a sheet brake 06 with respect to the transport direction T, which takes over the sheets to be deposited from the gripper carriage 02 and, after their release, decelerates them from the machine speed to the delivery speed. A sheet brake 06 can, for example, have pneumatically acting rotating and/or rotating braking elements acting on the underside of the sheet. The slowed down bows are particularly noticeable Stop surfaces of front edge stops 07 preferably under the action of the blown air from above and sink down to the stack surface. In this way, the display stack 03 is formed on the pallet 05 from sheets placed one on top of the other.

To the extent that the delivery stack 03 on the pallet 05 increases, the stack support plate 04 is lowered by the stack lifting drive, so that each sheet to be deposited covers approximately the same falling distance to the stack surface. The stack lowering movement can be controlled or regulated using sensors. If the display stack 03 has reached a certain or maximum height, the delivery stack 03 can be delivered without interruption using a non-stop device 08. The non-stop device 08 can also be used to separate different print jobs or the like. The delivery 01 can also be equipped with a logistics system for the preferably automated transport of full and/or empty pallets 05 or can also be designed as a double-stack or multiple-stack delivery.

For uninterrupted stack changing or stack removal, the non-stop device 08 in the delivery 01 has a stack insert that can be moved by a drive, in particular an auxiliary stack carrier. This stacking insert can be inserted or retracted into the stacking area or the sheet fall area and can be pulled out or moved out of the stacking area in the opposite direction to the insertion direction. In particular, the stack insert, here as an auxiliary stack carrier, can be moved into the stacking area in the transport direction T in order to carry the sheets to be picked up, the sheets picked up by the stack insert forming an auxiliary stack. The non-stop device 08 or the stack insert is here preferably arranged directly below the sheet brake 06 and in particular has a separate auxiliary stack lifting device for vertical displacement. In order for the stack insert or auxiliary stack carrier to move into the stacking area, the delivery stack 03 must be lowered so that the stack insert or auxiliary stack carrier is in an enlarged area Gap between two sheets that fall directly on top of each other can enter in the stacking area.

Fig. 2 shows a perspective view of a stack insert as an auxiliary stack carrier, for example a non-stop roller blind 09, for a sheet processing machine, for example as described above. The non-stop roller blind 09 has rotationally drivable support rollers 10 for the sheets to be picked up, which extend over the width of the non-stop roller blind 09, and a box-shaped reinforced tip located in front of the support rollers 10 in the insertion direction, for example in the transport direction T of the sheets. The support rollers 10 can be accommodated on both sides by chain links of a chain. The box-shaped reinforced tip is designed as a box profile 11 penetrated by a plurality of rollers 12. In particular, some and preferably all support rollers 10 of the non-stop roller blind 09 each have a surface line or surface that supports the sheets to be picked up over the width of the non-stop roller blind 09. The sheets to be picked up lie at least approximately continuously on the upper surface line of a respective support roller 10.

Furthermore, the rollers 12 penetrating the box profile 11 are mounted so that they can be driven around a common axis of rotation, in particular, whereby the rollers 12 can be mounted or fixed as separate elements on a common shaft 13 or can also be formed by a continuous roller which is pierced in areas, for example. The rollers 12 are preferably mounted on a common shaft 13, the common shaft 13 being mounted only at its ends facing away from one another on bearing points, in particular bearing blocks 14, or on at least three bearing points, in particular bearing blocks 14, preferably within the box profile 11. For example, the rollers 12 can be fixed on the shaft 13 in a non-positive and/or positive manner using screws, in particular using grub screws. In particular, all support rollers 10 and the rollers 12 penetrating the box profile 11 have the same diameter, for example 30 mm. The box profile 11 preferably encloses the shaft 13 carrying the rollers 12, with the shaft 13 carrying the rollers 12 being arranged approximately in the middle of the box profile 11 with respect to the insertion direction, here the transport direction T, of the non-stop roller blind 09. The rollers 12 preferably protrude beyond the box profile 11 on the surface facing the sheet to be picked up. The sheet-bearing vertex of the peripheral surface of a roller 12 can be spaced, for example, between 0.5 and 3 mm from the surface of the box profile 11 facing the sheet to be picked up. In the present case, the projection of the rollers 12 from the surface of the box profile 11 is at least approximately 2.5 mm. The rollers 12 are preferably fixed on the shaft 13 at a distance from one another, with each roller 12 in this case having a width of approximately 11.5 mm, with radii of, for example, 3 mm each on both sides preferably only 5.5 mm on the contact line or Circumferential surface is available for arc contact. Rollers 12 rounded in this way prevent the undersides of the sheets from being marked.

For example, the surface of the box profile 11 facing the sheet to be picked up can be formed by two parts arranged at an obtuse angle to one another, for example metal sheets or a correspondingly bent metal sheet. In the present case, the two parts are arranged at an angle of at least approximately 10°. The box profile 11 is preferably fixed on both sides to signs 15 carrying cam rollers 16, which interact with corresponding cam tracks, particularly in the area of the front edge stops 07. Particularly preferably, the box profile 11 is held by spring elements, not shown, in an orientation inclined to the horizontal and, when the cam rollers 16 run onto the cam tracks, is moved into an at least approximately horizontal orientation, in which a surface part of the box profile 11 is at least approximately parallel to a flat, preferably horizontal The support surface of the rollers 12 and support rollers 10 stands for the sheets to be picked up. The box profile 11 is preferably pivotally mounted by means of the plates 15, in particular about an axis of rotation of the rollers 12, where the box profile 11 or the signs 15 and the immediately adjacent support roller

10 can be connected, for example, via special chain links 17. Preferred here are the two surfaces of the box profile that face the sheet to be picked up

11 forming parts arranged such that one of the parts in an end position of the box profile 11 occupies an at least approximately horizontal position.

Each support roller 10 and the rollers penetrating the box profile 11 are preferred

12 supporting shaft 13 each has a pinion permanently assigned to it, preferably on the drive side of the machine. The pinions interact with a preferably overhead common stationary rack in such a way that the support rollers 10 and the rollers 12 penetrating the box profile 11 move simultaneously and in the same direction during a retraction movement or an extension movement of the non-stop roller blind 09. H. are analog forced-driven. A relative movement of the contact points of the support rollers 10 or the rollers 12 penetrating the box profile 11 to the underside of the lowest sheet to be caught is thus prevented.

One or more flexible support elements, such as belts or bands, can also be placed over the support rollers 10, which can further improve the reception of the sheets. For this purpose, one or more storage locations for receiving the flexible support elements can be assigned to the support roller 10 immediately adjacent to the box profile 11. In particular, the storage locations can act as punctured areas in a type of tape storage 18. The tape storage 18 can release the wound tapes (not shown) during the retraction movement of the non-stop roller blind 09 or pick them up again when the non-stop roller blind 09 is extended from the stacking area by rotating the last support roller 10, preferably wind them up again.

For example, the tip of the non-stop roller blind 09, in particular the box profile 11, can be movable on its front facing in the insertion direction or transport direction T, in particular rotationally movable, accommodated support rollers 19. Several support rollers 19 can be arranged next to one another coaxially across the width of the non-stop roller blind 09. The support rollers 19 in particular have a smaller diameter than the diameter of the support rollers 10 or rollers 12 and are preferably not drivable or driven. A movement, in particular rotation, of the support rollers 19 is therefore primarily only caused by arc contact.

Fig. 3 shows a sectional view of the tip of the non-stop roller blind 09 in an enlarged view. The box profile 11 preferably comprises an upper part 20 and lower part 21 that can be joined together. A plurality of bearing points, in particular bearing blocks 14, for the shaft 13 carrying the rollers 12 are preferably arranged between the lower part 21 and the upper part 20. For example, such a bearing block 14 can be assigned to every fourth or every third roller 12. To increase stability, spacers can also be assigned to one, several or each roller 12, preferably on both sides, through which the shaft 13 passes through without contact. The box profile 11 can preferably be produced by means of releasable fixing connections, in particular screw connections.

In particular, the upper part 20 and the lower part 21 are connected to one another via screws 22. Preferably, the bearing blocks 14 for the shaft 13 and/or the spacers, in particular through which the shaft 13 passes, are also fixed within the box profile 11 by means of the screws 22.

Furthermore, movably mounted contact elements for the sheets to be picked up could be assigned to the box profile 11, in particular to the upper part 20, which is formed here by the two parts arranged at an obtuse angle to one another. The box profile 11 or the upper part 20 can, for example, carry ball rollers, which cannot be driven and improve the ability of the non-stop roller blind 09 to be moved under the arch taken up.

How it works: For a stack change on a sheet processing machine, the stack insertion, in particular the non-stop roller blind 09, is connected to the rotationally driven support rollers 10, which extend over the width of the non-stop roller blind 09, and with one of the support rollers 10 in the insertion direction, here the transport direction T , upstream box-shaped reinforced tip for picking up sheets is inserted into the stacking area. The auxiliary stack of sheets that continue to fall is formed on the non-stop roller blind 09.

When the non-stop roller blind 09 is retracted, the arches tipping over the tip designed as a box profile 11 are held by the rollers 12 penetrating the box profile 11, in particular a relative movement of the contact points of the rollers 12 penetrating the box profile 11 to the underside of the lowest arch is prevented. For this purpose, the rollers 12 are driven in particular in the same way as the support rollers 10. The rollers 12 are driven in particular at a speed corresponding to the retraction speed of the non-stop roller blind 09, with the rollers 12 holding the sheet at a distance from the surface, here the upper part 20, of the box profile 11.

Reference symbol list

01 display

02 gripper truck

03 display pile

04 Stack support plate

05 pallet

06 Sheet brake

07 Front edge stop

08 Non-stop facility

09 Non-stop roller blind

10 support roller

11 box profile

12 roll

13 wave

14 bearing block

15 shield

16 cam roller

17 special chain link

18 tape storage

19 support rollers

20 top

21 bottom part

22 screw

T transport direction

Claims

Expectations

1. Stacking insert (09) with rotationally drivable support rollers (10) for sheets to be picked up that extend over the width of the stacking insert (09) and with a box-shaped reinforced tip in front of the support rollers (10) in the insertion direction (T), characterized in that the box-shaped Reinforced tip is designed as a box profile (11) penetrated by a plurality of rollers (12).

2. Stacking insert (09) according to claim 1, wherein the support rollers (10) each have a surface line carrying the sheets to be picked up over the width of the stacking insert (09).

3. Stacking insert (09) according to claim 1 or 2, wherein the rollers (12) are drivably mounted about a particular common axis of rotation (13).

4. stacking insert (09) according to claim 1, 2 or 3, wherein the box profile (11) is pivotally mounted in particular about an axis of rotation (13) of the rollers (12).

5. Stacking insert (09) according to claim 1, 2, 3 or 4, wherein the support rollers (10) and the rollers (12) penetrating the box profile (11) have the same diameter.

6. Stacking insert (09) according to claim 1, 2, 3, 4 or 5, wherein the support rollers (10) and the rollers (12) penetrating the box profile (11) each have pinions which interact with a common stationary rack.

7. Stacking insert (09) according to claim 1, 2, 3, 4, 5 or 6, wherein the rollers (12) are mounted on a common shaft (13) and the common shaft (13) only at their ends facing away from each other Bearing points (14) or on at least three bearing points (14) are stored. Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6 or 7, wherein spacers and / or bearing points (14) for a drivable shaft (13) carrying the rollers (12) are arranged within the box profile (11). . Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the box profile (11) is fixed on both sides to signs (15) carrying cam rollers (16). Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the box profile (11) and the immediately adjacent support roller (10) are connected via special chain links (17). Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the support roller (10) immediately adjacent to the box profile (11) has one or more storage locations (18) for flexible support elements . Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, wherein the box profile (11) on its front facing in the insertion direction (T) has, in particular, non-driveable, rotationally movable support rollers ( 19). Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, wherein the box profile (11) comprises a joinable upper part (20) and lower part (21). Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, wherein the box profile (11) can be produced by means of releasable fixing connections (22). Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the box profile (11, 20) carries non-drivable, movably mounted contact elements for the sheets to be picked up. Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or

15, wherein the box profile (11) encloses one or the shaft (13) carrying the rollers (12). Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16, wherein one or the shaft (12) carrying the rollers (12) 13) is arranged approximately in the middle of the box profile (11) with respect to the insertion direction (T) of the stack insert (09). Stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17, wherein the rollers (12) hold the box profile (11 ) on the surface facing the sheet to be picked up. Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

16, 17 or 18, the sheet-bearing vertex of the peripheral surface of a roller (12) being spaced between 0.5 and 3 mm from the surface of the box profile (11) facing the sheet to be picked up. Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 or 19, two at an obtuse angle mutually arranged parts which form the surface of the box profile (11) facing the sheet to be picked up. Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, where two are the Parts forming the surface of the box profile (11) facing the sheet to be picked up are arranged in such a way that In each case one of the parts assumes an at least approximately horizontal position in an end position of the box profile (11). Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or 21, wherein the Rollers (12) are fixed at a distance from one another on one or the shaft (13). Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 or 22, wherein the rollers (12) are fixed non-positively and/or positively on one or the shaft (13). Stack insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 or 23, whereby the rollers (12) are fixed on one or the shaft (13) by means of grub screws. Display (01) with a stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 or 24. Sheet processing machine with a delivery (01) with a stacking insert (09) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25. Method for changing stacks on a sheet processing machine with a stack insert (09), in particular using a stack insert (09) according to one of the preceding claims, with rotationally driven support rollers (10) extending over the width of the stack insert (09) for picking up sheets and with a box-shaped reinforced tip in front of the support rollers (10) in the insertion direction (T), characterized in that when the Stacking insert (09) over the tip designed as a box profile (11). Tilting sheet is held by rollers (12) penetrating the box profile (11). Method according to claim 27, wherein the rollers (12) are driven in particular analogous to the support rollers (10). Method according to claim 27 or 28, wherein the rollers (12) are driven in particular at a speed corresponding to the retraction speed of the stack insert (09). A method according to claim 27, 28 or 29, wherein the rollers (12) hold the sheets spaced from the surface of the box section (11).