DE20107827U1 - Stack converters and pallet storage in logistics for print shops - Google Patents

Description

[Utility model application]

[Name of the invention]

Stack converter and pallet storage in a logistics for Printing companies

[Description]

The invention relates to a device according to the preamble of claim 1

[State of the art]

It is common practice to use logistics systems to process sheet-shaped printing materials in the graphic industry. Such systems are used to ensure that printing materials in stack form can be brought from a delivery station via an intermediate storage facility and transport systems, if necessary, to any sheet-processing machine and from there transported on after processing. In this case, it may be necessary to reposition sheet stacks delivered in their raw state for processing in a sheet-processing machine. Stack changers or other aids are often used for this. It must also be ensured that the logistics system is supplied with appropriate transport aids. In this case, sheet-processing machines in particular are often provided with devices for automatically exchanging sheet stacks. For such so-called non-stop stack changing systems, which can be assigned to a sheet feeder or sheet delivery device of a sheet-processing machine, special transport devices for the sheet stacks are required. For this purpose, stack pallets are usually used which are equipped with a groove pattern embedded in the support side and serve as

In such a

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A non-stop pile changer with an auxiliary support device for supporting a remaining pile in the form of a pile rake can intervene in the groove pattern. The special system pallets required for this must be introduced into the logistics process. The existing sheet stack must be transferred to a system pallet. During further processing, it may also be necessary to provide a certain cycle for the system pallets, which allows the system pallets to be used again when a stack has been processed. In addition, such a system pallet can also be used both when using a sheet stack in the sheet feeder of a sheet processing machine and in the sheet delivery of the same machine. Logistics therefore also makes sense in this area, with the pallets being transported to and from the machine, as well as from the sheet feeder to the sheet delivery of the machine. It is also possible to provide storage in the printing area so that the delivered sheet stacks are kept ready for processing on the existing sheet processing machines. In particular, the use of the system pallets must be ensured.

The aim of the invention is therefore to solve the processing of any sheet stack in the simplest way possible, whereby the loading with system pallets is to be simplified.

[Task of the invention]

The object of the invention is therefore to further develop the device according to the preamble of claim 1 in such a way that easier sheet stack handling is made possible when sheet stacks are to be combined with so-called system pallets.

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The solution to the problem is designed according to the characterizing features of claim 1.

The particular advantage of the embodiment according to the invention is that a simple device can be provided for feeding special system pallets to the sheet stack. The use of this stacker standardizes and integrates the feeding of system pallets and the removal of transport pallets. The connection to the logistics system is advantageously simple. The stacker can be assigned to the stack turner and embedded in the floor. The feeding of the system pallets to the stack turner is then organized accordingly.

The advantage of another device according to the invention is that a stack can be removed from the pallet and placed on a system pallet without reaching under the pallet. This makes it easier to transfer the stack from a transport pallet or any pallet carrier to a special pallet.

[Examples]

A device of the type mentioned is described in more detail below using drawings.

Figure 1 a system for printing logistics, Figure 2 a diagram of a logistically integrated sheet processing machine Figure 3A to 3C

a stacker,
Figure 4A to 4C

a further embodiment of a stacker and figure Ä'rfiSs ^c::": ·: i":""&khgr;·":"·" I ! &Iacgr;

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a palletless stacker.

As shown in Figure 1, the logistics of sheet-processing machines in graphic companies generally consists of a delivery station A, to which stacks of sheets are delivered on transport pallets by the paper manufacturer. From there, the stacks of sheets can first be taken to a storage station B. This can, for example, consist of a high-bay warehouse that enables space-saving storage of the paper stock.

Furthermore, each sheet stack can be delivered from an area C for acclimatization directly to the processing area on sheet processing machines Dl, D2, D3. Before the sheet stack is taken to a sheet processing machine, it can be removed from a transport pallet at a restacking station E and transferred to a system pallet. In this case, it may be necessary to remove the wrapping of the sheet stack that was intended for 0 transport. In addition, the sheet stack can

at this point or already upon delivery, it is provided with a code which contains both its origin, its properties and its processing instructions.
25

The sheet stacks are transported between the various stations by means of roller conveyors F. In the area of the roller conveyors F, both rotating elements Fl and cross slides F2 can be provided for rotating or transversely moving the sheet stacks. Furthermore, parallel parking areas F3 are often available for sheet stacks to be prepared. The main transport line is connected to the conveyor lines of the sheet processing machines by means of partial conveyor lines G.

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Figure 2 shows a schematic representation of a sheet processing machine D. It has a first conveyor line H "in the area of its sheet feeder 1 and a second conveyor line J in the area of its sheet delivery 2. Printing units 3 are arranged between the sheet feeder 1 and the sheet delivery 2. A stack of sheets can be brought to a preparation position K using one of the partial conveyor lines G. From there it is transported to the sheet feeder 1 using the conveyor line H and inserted into it. For this purpose, a separate roller track section H1 is provided on a stack support plate of the stack elevator in the sheet feeder 1, which is used to feed the full pallet into the sheet feeder 1 and to transport away an empty pallet after the sheet stack has been processed. The empty pallet is made available for removal at the end H2 of the conveyor line H. A device for non-stop stack changing is integrated in the sheet feeder 1. This is used to remove a pallet from a processed stack and to insert a stack of sheets on a new pallet. For this purpose, a rake device reaches under the stack residue remaining on the pallet in the sheet feeder 1, so that the empty pallet can be removed and pushed from the roller conveyor section Hl to the end H2 of the roller conveyor. The empty pallet can now be moved by means of a stacker or a special conveyor system 4 to the conveyor section J on the sheet delivery of the sheet processing machine. It is provided on a roller conveyor start Jl and can be provided on a roller conveyor section J2 on a stack support plate of a stack elevator in the sheet delivery 2 to take over the sheets to be delivered. For this purpose, a device for non-stop stack changing comparable to that of the sheet feeder 1 can be provided in the sheet delivery 2. The continuous roller conveyor J ends at a provision position L. From there, the sheet stack can be placed on a

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Conveyors are fed to further processing. So that the sheet stack can be made available at the supply position L as required, a sliding device 4.1 is provided in the sheet delivery 2 in the area of the roller conveyor section J2. This serves to move the empty stack pallet into a position suitable for processing so that sheets of all formats can be placed on the pallet as required. After the stack has been completed, the sheet stack and pallet can be moved back to the center of the roller conveyor J using the sliding device 4.1, which means that the sheet stack then arrives at the supply position L in the center. This is important for uninterrupted further processing.

Figures 3A to 3C show a restacking device. In the area of the restacking station E according to Figure 1, a device can be provided by means of which the sheet stack 28 can be placed on a system pallet 30 together with the transport pallet 2 9 that carries it. This system pallet 30 0 is taken from a pallet storage device 31 and pushed under the raised transport pallet 2 9 by means of a sliding device 32. The sheet stack 2 8, which is now sitting on two pallets, can then be turned in a stack turner and the transport pallet 2 9 can be removed from this. For this purpose, the stack turner is provided with a clamping device for holding the system pallet 3 0. A simplified device is used for the directed placement of the sheet stack 28 on a system pallet 30. For this purpose, colored markings 34 are provided on a stop wall 33 on the device.

In Figures 4A to 4C, a stacking device 35 for depositing a sheet stack 28 on a system pallet 30 in a stack turner 36 is shown. The stacking device is

arranged in front of the pile turner 36 and sunk into the ground - • · ··· * .· i &igr;&Iacgr;;&idigr; .* ·**· ·* j* iii

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bar. It has support arms 37 that can be extended into the area of the pile turner. The system pallet 30 can be pushed underneath with the transport pallet 29 after the sheet stack 28 has been lifted. The stacking device 3 then places the sheet stack 28 back together with the transport pallet

2 9 on the system pallet 3 0. The pile turner 3 6 can now grasp and turn the package of transport pallet 29, system pallet 3 0 and sheet stack 2 8 together. The system pallet 30 is clamped to the corresponding holding plate of the pile turner 36. The pallet clamp 37.1 is suitable for all pallet formats. It has a clamping rail which moves against the pallet foot of the system pallet 3 0 by means of a lever drive and clamps it in such a way that the system pallet 3 0 remains hanging upside down on the holding plate which is then at the top when it is turned.

The pallet clamping can also be used as a system of hook-shaped elements on the corresponding holding plate of the stack turner

3 6 should be provided.

Figures 5A to 5C show a stack transfer device by means of which a sheet stack 28 can be gripped via clamping arms 43 and lifted off a pallet. This is made possible by the fact that the sheet stacks 28 are still packed in a film sleeve in the transport state and therefore have sufficient inherent stability. Transferring the sheet stack 28 is thus greatly simplified. An overhead exchange of the transport pallet for a system pallet is therefore no longer necessary.

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[List of reference symbols]

Delivery station A Storage station B Area C for acclimatization of sheet processing machines Dl, D2, D3 Restacking station E Roller conveyors F Rotating elements Fl Cross slides F2 Parking areas F3 Partial conveyor lines G Conveyor line H Second conveyor line J Preparation position K Roller conveyor section Hl End H2

Roller conveyor start Jl Roller conveyor section J2 Preparation position L Sheet feeder 1 Sheet delivery 2 Printing units 3 Conveyor system 4 5 Sheet stack pusher 2 8 Transport pallet System pallet 3 Pallet storage 0 Stop wall pusher 3 3 Markings 34 Restacking device 3

Pile turner 3 6

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Support arms 3 7
Pallet clamp 37.1
Clamping arms 43

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Claims (9)

1. Device for transporting stacks of sheets, characterized in that a device is provided for setting down stacks of sheets sitting on transport pallets on a system pallet provided with a grooved supporting surface, that the device has a magazine for system pallets, that a vertical stop surface is provided in front of which a system pallet can be positioned on a horizontal surface and that a transport pallet with a stack of sheets sitting on it can be set down against the stop surface on the system pallet by means of a transport means. 2. Device according to claim 1, characterized in that the system pallets can be conveyed from a storage area to the horizontal surface by means of a drive. 3. Device for transporting stacks of sheets, characterized in that a device for exchanging a transport pallet for a system pallet provided with a groove pattern on its supporting upper side is designed as a lifting device which is assigned to a stack turner, wherein the lifting device is assigned to the stack turner in such a way that stacks of sheets deposited in the stack turner can be lifted by means of it. 4. Device according to claim 3, characterized in that the device is designed as a lifting device which can be sunk into the ground and is provided with support arms which can be extended in the direction of the pile turner. 5. Device according to claim 3 or 4, characterized in that the pile turner is assigned a device for automatically transporting system pallets into the pile turner when the sheet pile is raised. 6. Device for transporting stacks of sheets, characterized in that a stack turner is provided, on at least one support plate of which a clamping device for pallets is provided, such that pallets of any size can be clamped, wherein a clamping rail arranged displaceably relative to an abutment on the stack turner serves to clamp the pallets. 7. Device according to claim 6, characterized in that a device for clamping the system pallets is movable by means of a spindle drive, wherein the clamping rail is slidably mounted on guides and is provided on one or both support plates of the pile turner. 8. Device according to claim 6, characterized in that the device for clamping the system pallets is provided as a system of hook-shaped elements on one or both support plates of the stack turner. 9. Device for transporting stacks of sheets, characterized in that a device is provided for gripping a stack of sheets on a pallet, the device being designed such that the stack of sheets can be gripped by means of holding arms on at least two opposite side surfaces and can be lifted off a pallet by means of frictional engagement and placed on a further pallet, the stack of sheets preferably being enclosed on all sides or on several sides by a transport casing.