APPARATUS FOR CUTTING A MATERIAL WEB INTO INDIVIDUAL SHEETS WITH A WEB STORAGE

Abstract

An apparatus, in particular roll-type cross cutter, is shown and described, further in particular for forming a shingled stream of underlapping or overlapping sheets, in particular sheets of paper or cardboard, having a cross-cutting device for cutting a material web into individual sheets and having a web storage upstream of the cross-cutting device along the web transport path for storing and/or providing a material web, the material web being fed to the web storage from a web unwinding. According to the invention, it is provided that the web storage for storing the material web is arranged in the region of the cross-cutting device below the running height of the sheets.

Claims

1. An apparatus, in particular roll-type cross cutter, further in particular for forming a shingled stream of underlapping or overlapping sheets, in particular paper or cardboard sheets, having a cross-cutting device for cutting a material web into individual sheets and having a web storage upstream of the cross-cutting device along the web transport path for storing and/or providing a material web, wherein the material web is fed to the web storage from a web unwinding, wherein the web storage for storing the material web is arranged in the region of the cross-cutting device below the running height of the sheets.

2. The apparatus according to claim 1, wherein the web storage is configured for horizontal storage of the material web.

3. The apparatus according to claim 1, wherein a shingling device downstream of the cross-cutting device in the transport direction of the sheets is provided for regionally underlapping or overlapping the sheets, wherein the web storage for storing the material web in the transport path of the sheets between the cross-cutting device and the shingling device is formed below the running height of the sheets.

4. The apparatus according to claim 1, wherein a braking device downstream of the shingling device in the transport direction of the sheets for braking shingled sheets, in particular by forming a braking gap for the passage of sheets brought together in an overlapping manner, is provided, wherein the web storage for storing the material web is formed for storing the material web in the transport direction of the sheets between the cross-cutting device and the braking device below the running height of the sheets.

5. The apparatus according to claim 1, wherein a material web infeed upstream of the cross-cutting device along the web transport path is provided for the driven feeding of the material web from the web store to the cross-cutting device, the web storage being designed to store the material web in the transport direction of the material web between the material web infeed and the cross-cutting device below the running height of the sheets.

6. The apparatus according to claim 1, wherein the web storage has at least two fixed deflection rollers lying vertically one above the other, wherein the fixed deflection rollers are arranged, preferably, between the cross-cutting device and the web unwinding, preferably in the region between the material web infeed and the web unwinding, below the running height of the sheets.

7. The apparatus according to claim 1, wherein the web storage has at least one, preferably at least two, more preferably together, horizontally displaceable deflection rollers, wherein the displaceable deflection rollers are displaceable in the direction of the web unwinding into a threading position laterally of the stationary deflection rollers.

8. The apparatus according to claim 1, wherein the movable deflection roller is moveable from the threading position in the direction of the braking device into a maximum storage position in which the length of the storage section of the material web between a fixed deflection roller and the movable deflection roller is maximum, wherein, preferably, the maximum storage position is reached in the region between the cross-cutting device and the braking device, further preferably in the region between the shingling device and the braking device.

9. The apparatus according to claim 1, wherein the web storage has at least one horizontally movable dancer deflection roller for influencing the material web tension, wherein the dancer deflection roller is provided preferably in the transport direction of the material web in the region vertically between two movable deflection rollers of the web storage.

10. The apparatus according to claim 1, wherein the web storage, and, preferably, together with the cross-cutting device, the shingling device and the braking device, is mounted on a chassis which is designed to be movable laterally, preferably perpendicularly, to the transport direction of the sheets relative to the web unwinding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The invention is explained in more detail below on the basis of the figures; it shows

[0037] FIG. 1 a schematic representation of an apparatus according to the invention for cutting a material web into individual sheets with a web storage in a side view,

[0038] FIG. 2 a schematic representation of the web storage shown in FIG. 1, which is arranged on a chassis, wherein movable deflection rollers of the web storage are in a home position and

[0039] FIG. 3 a schematic representation of the web storage arranged on the chassis in FIG. 1, whereby the movable deflection rollers are in a maximum storage position.

DETAILED DESCRIPTION

[0040] FIG. 1 schematically shows an apparatus 1 according to the invention for cutting a material web 2 into individual sheets 3 of paper or cardboard. The device 1 has a web unwinding 4 which provides a quasi endless material web 2 from a paper roll 5. The material web 2 is provided by the web unwinding 4 and can initially be conveyed over several deflection rollers 22. FIG. 1 shows that by adjusting the height of deflection rollers 22, different web transport routes from the web unwinder 4 with different lengths to the following functional units can be realized.

[0041] After passing two fixed deflection rollers 22, the material web 2 can be pulled over a crushing tool 6 to compensate for curvatures that may have been caused by the rolled up bearing of the material web 2 on a paper roll 5.

[0042] Along the transport path of the material web 2, a web storage 7 is provided after the web unwind 4, through which the material web 2 passes. A preferred system limit of the functional unit web storage is shown schematically as a dashed line in FIG. 1.

[0043] The web storage 7 is followed along the web transport path by a material web infeed 8 which serves to drive the material web 2. The material web 2 is then led to a cross cutting device 9, where the material web 2 is cut into sheets 3. In transport direction 10 of the sheets 3, a shingling device 11 is arranged downstream of the cross cutting device 9, with which an overlapping shingled stream is produced. A braking device 12 is provided down-stream of the shingling device 11 in the transport direction 10 of the sheets 3, wherein the braking device 12 can be formed, for example, by nip rollers. This is already described in WO 2018/229201 A1. The disclosure content of WO 2018/229201 A1 is hereby incorporated by reference and fully included in the disclosure content of this description.

[0044] The web storage 7 is arranged on a schematically shown chassis 13 together with the mate-rial web infeed 8, the cross cutting device 9, the shingling device 11 and the braking device 12. The chassis 13 is mounted on rollers 14 and can be displaced transversely to the transport direction 10 of the sheets 3 relative to the web unwinding 4. During an interruption of the material web processing, the chassis 13 can be moved out of the processing line transverse to the transport direction 10 of the sheets 3. In this way, especially during repair and maintenance work, the accessibility to the components and assemblies on chassis 13 and to the adjacent components and assemblies can be improved. Alternatively or additionally, chassis 13 can also be guided on rails not shown. Other components and assemblies, such as the crushing tool 6, can also be arranged on chassis 13 and can be moved laterally together with it.

[0045] As FIG. 1 shows, the web storage 7 is horizontally aligned and arranged below the sheet transport level of the sheets 3 in the area between the material web infeed 8 and the braking device 12. The material web 2 can be fed into the web storage 7 in vertical direction. The material web 2 is guided over a first fixed deflection roller 15 as a component of the web storage 7 and, forming a web loop 16, around a first movable deflection roller 17. The following deflection roller along the web transport path is designed as dancer deflection roller 18. To form a second web loop 19, the material web 2 is then guided around a second movable deflection roller 20 to a second fixed deflection roller 21. The material web 2 then leaves the web storage 7 in vertical direction and is deflected by another deflection roller 22, which is outside the system boundary of the web storage 7, to the material web infeed 8.

[0046] The two movable deflection rollers 17, 20 can be moved together in horizontal direction by a drive 23. The movable deflection rollers 17, 20 can be moved in the direction of the web unwinding 4 and brought into a threading position 24 (in FIG. 1 shown as dashed lines). In the threading position 24, the horizontal distance of the movable deflection rollers 17, 20 to the web unwinding 4 is smaller than the distance between the fixed deflection rollers 15, 21 and the web unwinding 4. When changing the paper roller 5, the material web 2 can then be easily passed in vertical direction linearly between the fixed deflection rollers 15, 21 and the movable deflection rollers 17, 20. This eliminates the need for time-consuming manual wrapping of the movable deflection rollers 17, 21 to form the web loops 16, 19. After the material web 2 has been fed through the material web infeed 8, the movable deflection rollers 17, 20 can be moved in the transport direction 10 of the sheets 3 to a so-called home position 25, where no web material or only a short length of the material web 2 is stored or held in the web storage 7.

[0047] FIG. 2 shows the chassis 13 with the web storage 7, whereby the movable deflection rollers 17, 20 are in the home position 25. As shown in FIG. 2, the basic position 25 can be in vertical and/or horizontal direction in the area between the fixed deflection rollers 15, 21. Alternatively, the basic position 25 can also be located laterally next to the fixed deflection rollers 15, 21 in transport direction 10 of the bends 3.

[0048] FIG. 3 shows the chassis 13 with the web storage 7, whereby the movable deflection rollers 17, 20 are in a storage position 26. The storage position 26 marks the maximum travel position of the movable deflection rollers 17, 20 in the transport direction 10 of the bends 3. The movable deflection rollers 17, 20 can be moved between the home position 25 and the storage position 26 when operating the apparatus 1. The distance X between the home position 25 and the storage position 26 defines the maximum length of the storage section and thus determines the maximum length of the material web 2 to be taken up by the web storage 7. The length of the maximum length of the material web 2 that can be picked up corresponds essentially to four times the length of the storage section, i.e. essentially four times the distance X from FIG. 3. In the design of the web storage 7 shown in FIG. 3, the distance X corresponds to half the length of a web loop 16, 19. The basic position 25 of the movable deflection rollers 17, 20 can also be further to the left with reference to FIG. 3, i.e. shifted in the direction of the braking device 12.

[0049] When braking or stopping the apparatus 1, the material web infeed 8, the cross cutting de-vice 9, the shingling device 11 and the braking device 12 must be stopped synchronously in order to ensure the synchronized running of the above mentioned assemblies. Due to the high mass inertia of the paper roll 5, the web unwinding 4 can only be braked with a time delay to the above-mentioned devices. When braking the apparatus 1, the movable deflection rollers 17, 20 are moved in transport direction 10 of the sheets to take up the material web 2. The length of the storage section and thus also the length of the web loops 16, 19, is increased in this way. The excess material web 2 is thus taken up and stored by the web storage 7. The tension of the material web 2 preferably remains unchanged during the braking process.

[0050] When the apparatus 1 is started up again, the material web infeed 8, the cross cutting de-vice 9, the shingling device 11 and the braking device 12 can be started up synchronously and briefly before the web unwinding 4. The web storage 7 then takes over the function of providing the stored material web 2. For this purpose the movable deflection rollers 17, 20 are moved against the transport direction 10 of the sheets. The length of the web loops 16, 19 is reduced in this way and the previously stored material web 2 is released by the storage. As soon as the web unwinding 4 has reached the production speed of the other assemblies, the movable deflection rollers 17, 20 stop and are then preferably in the home position 25. During operation of the apparatus 1, the movable deflection rollers 17, 20 can be moved between the home position 25 and the storage position 26 for storing the material web 2.

[0051] Along the web transport path between the first movable deflection roller 17 and the second movable deflection roller 20, a dancer deflection roller 18 is provided for regulating the material web tension. The compensation of web tensions is effected by the dancer deflection roller 18 with a hydraulic drive 27 performing small lifting movements in and/or against the transport direction 10 of the sheets 3 in horizontal direction. In this way the length of the web transport path is slightly increased or reduced. If, for example, the tension of the material web 2 is too low, the dancer deflection roller 18 is moved against the transport di-rection 10 of the sheets 3, thus increasing the length of the web transport path. This in-creases the tension in the material web 2. Conversely, if the web tension is increased, the length of the web transport path is reduced by a lifting movement of the dancer guide roller 18 in transport direction 10 of the sheets 3. The control of the web tension is thus directly integrated into the web storage 7. The need to provide a device for controlling the web tension that is spatially separate from the web storage 7 is eliminated.

REFERENCE SIGNS

[0052] 1 Apparatus [0053] 2 Material web [0054] 3 Sheets [0055] 5 Web unwinding [0056] 5 Paper roll [0057] 6 Crushing tool [0058] 7 Web storage [0059] 8 Material web infeed [0060] 9 Cross-cutting device [0061] 10 Transport direction [0062] 11 Shingling device [0063] 12 Braking device [0064] 13 Chassis [0065] 14 Roll [0066] 15 Deflection roller [0067] 16 Web loop [0068] 17 Deflection roller [0069] 18 Dancer deflection roller [0070] 19 Web loop [0071] 20 Deflection roller [0072] 21 Deflection roller [0073] 22 Deflection roller [0074] 23 Drive [0075] 24 Threading position [0076] 25 Home position [0077] 26 Storage position [0078] 27 Drive