Apparatus for conveying sheets in a folding machine and folding machine comprising the apparatus

Abstract

The invention relates to a device for transporting sheets in a folding machine and to a folding machine. The device comprises a transport table (11) for sheets (2) with a transport direction (13) and at least one presser (20) for sheets, which can be positioned along the transport direction (13) according to a first format (2a) of the sheets (2), characterized in that the presser (20) comprises a multi-sectioned finger (21), wherein at least a first section (22) and a second section (23) are present, wherein the second section (23) can be moved relative to the first section (22) so that the length (21a) of the finger (21) can be adjusted according to a second format (2b) of the sheets (2). The invention advantageously makes it possible to make format adjustments without errors on the folding machine or on the transport table thereof. The invention can be used, for example, in industrial folding machines with scale-like sheet transport.

Description

Technical Field

[0001] The present invention relates to an apparatus for conveying sheets in a folding machine and a folding machine including the apparatus.

[0002] This invention belongs to the field of graphic industry technology, particularly the field of folding flexible sheet-shaped substrates, or the field of industrialized, i.e., high-quality and high-volume manufacturing of folded products, such as brochures, which are preferably made of paper, paperboard, cardboard, plastic or composite materials, especially printed paper. Essentially, this invention relates to the uninterrupted transport of sheets in a folding machine or the uninterrupted transport of sheets through a folding machine. Background Technology

[0003] In the prior art, known industrial folding machines preferably have multiple folding units (folding stations) for producing folded products from sheet-shaped substrates (e.g., made of paper), and include conveying units for moving the folded products. For example, the folding units can be bag-type folding units and / or knife-type folding units for creating preferably multiple creases. The conveying units can be, for example, roller tables with inclined conveyor rollers. Such folding machines typically also include feeders for the sheets to be folded, such as stack feeders, and receivers for the folded products. The sheets to be folded are preferably conveyed to the first folding unit in a flow, and particularly preferably in a flake flow. In high-end machines, the conveying between folding units can also be so-called flake conveying. Furthermore, such folding machines also include a machine control system in the form of a digital computer with control software.

[0004] Here, a so-called scale is typically used on the roller table to align the conveyed sheets and determine their (further) direction of movement. Bag folding machines with more than one folding station usually have a roller table downstream of the (first) folding unit to deflect the output sheets 90° and convey them to the next (second) folding unit. To accelerate the sheets quickly and with low slippage, ball or tapered rollers typically apply a normal force to the sheets from above. To ensure the sheets safely reach the stop on the scale below the ball or roller, a clamping element is used. This is achieved by an insert plate fixed to the scale and a manually adjustable pressure element (which the operator can position above the sheet edge or surface, depending on specifications). Whether an additional pressure element is used depends on factors such as weight, folding type, and folding speed.

[0005] To achieve faster scale folding on high-end machines such as the Stahlfolder TH82-P folding machine from Heidelberg Printing Machines AG, a rod called a scale is used, with balls (ball rod or so-called "ball scale") inserted into holes in the rod. One characteristic of this machine, compared to sheet-fed machines without a scale setup, is that the balls are not fully equipped in the initial area. This deliberate omission of balls allows subsequent sheets to slide more easily onto the sheets below them, thus facilitating the establishment of scale flow and more even impact on the scale. In the corner area of ​​the preceding sheet against the scale, some balls are lifted by a sliding lifter. With larger sheet widths, the pusher is pushed further in the transport direction, resulting in more balls being lifted; with smaller sheet widths, the lifter is pushed less in the transport direction, resulting in fewer balls being lifted. Furthermore, the lifter closes the ball groove on the underside of the scale, preventing the leading edge of the sheet from catching on the scale and causing malfunctions. The lifter is manually adjusted by the operator. The characteristic of scale folding is that the sheets leaving the previous station (folding station) are directly guided onto the roller table and then slide parallel to the roller table towards the scale. During this transport, the sheets lie flat, so it is particularly important to use a pressure plate to prevent the sheets from rising. The pressure plate used in TH82-P is clamped onto the scale insert plate. Pressure plates come in long and short types; the long type is used for symmetrical folding types and long specifications, while the short type is used for asymmetrical folding types and short specifications. When changing from a long specification to a short specification on the roller table, the long pressure plate must be manually replaced with the short pressure plate. Practice shows that the removed pressure plates have no designated storage location and are therefore frequently lost. Problems will occur if this pressure plate is missing during the transport of sheets of other specifications. In addition, the operator may incorrectly install or adjust the pressure plate, thus affecting the sheet transport. The operator must also adjust the lifter according to the current specifications to avoid scale formation failure due to excessive friction between sheets or paper jams caused by the edges of the sheets being caught. Practice has shown that it is difficult for inexperienced operators to position the lift precisely to the required specifications, and errors can lead to costly machine downtime.

[0006] DE102013107598B3 discloses an apparatus for grooved sheets, which includes a means for conveying the sheets, the means comprising a conveying roller having a conveying direction and a movable and fixed pressing member, wherein the pressing member includes a ball and an orientation device is arranged on the pressing member.

[0007] A growing number of industrial producers of high-quality printed products are engaged in continuous and fierce competition, constantly demanding that (high-end) folding machine manufacturers continuously improve their machines. This is primarily to reduce production costs and avoid or at least minimize potential downtime, and secondly to further enhance the already high quality of printed products. Another reason is the increasing shortage of trained professionals. Therefore, the machines are often operated by less trained personnel, but operational errors must still be avoided. This is the significance of this invention. Summary of the Invention

[0008] Therefore, the objective of this invention is to improve upon the prior art, particularly to prevent errors in setting specifications on folding machines or their conveyor belts.

[0009] According to the present invention, the task is solved by the preferred technical solution of the present invention.

[0010] Advantageous and therefore preferred extensions of the invention are derived from the alternative technical solutions, the specification, and the drawings.

[0011] According to the present invention, an apparatus for conveying sheets in a folding machine is provided, comprising a conveying table for the sheets and at least one pressing member for the sheets, the conveying table having a conveying direction, the pressing member being positionable along the conveying direction according to the sheet specifications, characterized in that the pressing member comprises multi-segmented fingers, wherein at least a first segment and a second segment are present, wherein the second segment is movable relative to the first segment, thereby allowing the length of the fingers (e.g., denoted by L1) to be adjustable according to the sheet specifications.

[0012] A folding machine using the apparatus according to the invention comprises a first folding station and a second folding station arranged downstream of the production process, characterized in that the apparatus according to the invention is arranged between the first and second folding stations in the production process. Here, the first folding station may be defined as a bag-type folding station, the second folding station as a bag-type folding station, the conveying direction of the conveyor table being transverse to the output direction of the first folding station, and / or the conveying direction of the conveyor table being parallel to the supply direction of the second folding station.

[0013] Advantageous design and effects of the present invention This invention advantageously enables error-free sizing on folding machines or their conveyors. For example, the invention can be used in industrial folding machines with scale-like conveyors.

[0014] This invention enables operators to quickly and easily adapt the pressing elements used for sheet transport in folding machines to different length and width specifications without the need for laborious replacement or removal. On the one hand, this advantageously prevents removed pressing elements from being reinserted or incorrect pressing elements from being used. On the other hand, it also makes it easier for operators to select the correct specification settings, especially for those with limited experience. Other specific advantages include: improved operator friendliness through quick, easy, and tool-free movement of the pressing elements according to the specified width; quick, easy, and tool-free adaptation of the pressing element length according to the specified length, particularly without the need to replace parts; elimination of the additional adjustment process for the (ball) lift; and improved reliability of the folding operation due to the correct positioning of the pressing elements.

[0015] The pressing element is a (multi-section) component used to press the sheet down onto the conveyor table at the pressing element's position, preventing the sheet from moving upwards away from the conveyor table during transport. The length of the finger is preferably the effective length, i.e., the length of the distance that causes the pressing element to exert its pressing function. This length is preferably measured transversely to the transport direction. The multi-section nature of the finger preferably refers to the number of sections on the finger with the pressing function, for example, 2 or 3 sections, at least one of which is movable, particularly pivotable, to allow for length adjustment. The sheet specifications can be given as length (parallel to the transport direction) and width (transverse to the transport direction); these specifications can be changed, for example, halved, due to the folding process after each folding station; simultaneously, the values ​​of length and width can also be changed due to changes in direction during transport, such as a 90° change.

[0016] Extended solutions of the present invention The preferred extensions of the present invention (hereinafter referred to as "extensions") are described below. Where it is not technically impossible, these extensions can also be combined with each other.

[0017] One extension is characterized in that the second section can be arranged on the first section. Another extension is characterized in that the second section is rotatable relative to the first section. Another extension is characterized in that a disc spring can be present, creating an escapement mechanism between the second and first sections. Another extension is characterized in that at least one stop can be present for the second section. Another extension is characterized in that the stop can be arranged on the first section.

[0018] An extension scheme is characterized in that the second section can move relative to the first section. An extension scheme is characterized in that the second section can be telescopically moved relative to the first section.

[0019] One extension is characterized in that the multi-section finger may include a third section, which is movable relative to the second section, thereby allowing the length of the finger to be adjusted according to the page specifications. Another extension is characterized in that the third section may be arranged on the second section. Another extension is characterized in that the third section is rotatable relative to the second section. Another extension is characterized in that the third section can rotate together with the second section. Another extension is characterized in that an additional disc spring may be present, creating an escapement mechanism between the third and second sections. Another extension is characterized in that at least one additional stop is present for the third section. Another extension is characterized in that said additional stop is arranged on the second section.

[0020] An extension scheme is characterized in that the third section is movable relative to the second section. An extension scheme is characterized in that the third section is telescopically movable relative to the second section.

[0021] One extended embodiment features a linear guide device whose longitudinal direction is parallel to the conveying direction, and a slider movably arranged on the linear guide device, with a pressure member arranged on the slider. Another extended embodiment features a linear guide device that can be positioned transversely to the sheet conveying direction according to the sheet specifications. Another extended embodiment features a linear guide device that can be designed as a track. Another extended embodiment features a track that can be designed as a round bar. Another extended embodiment features a slider that can include a clamping element, such as a clamping screw, to secure the slider to the track. Another extended embodiment features a pressure member rotatably arranged on the linear guide device. Another extended embodiment features a stop for said rotation.

[0022] One extension is characterized in that the pressing member can have a guide surface for the sheets. Another extension is characterized in that the guide surface is inclined upwards relative to a horizontal surface. Another extension is characterized in that the guide surface can form the upper side of a feed funnel-shaped member for the sheets. Another extension is characterized in that the guide surface can be formed by the lower side of the first section. Another extension is characterized in that the guide surface can be formed by the lower sides of the first and second sections. Another extension is characterized in that the guide surface can be composed of the lower sides of the first, second, and third sections. Another extension is characterized in that the guide surface can be a flat, stepless surface. Another extension is characterized in that the guide surface can include a feeding area. Another extension is characterized in that the feeding area can be inclined upwards more than the guide surface. Another extension is characterized in that the feeding area can be formed on the first section. Another extension is characterized in that the feeding area is formed by the second section. Another extension is characterized in that the feeding area is formed on the third section.

[0023] One extended solution is that the conveyor table can be an inclined roller table.

[0024] One extension embodiment is characterized in that the device may have the aforementioned pressing member and at least one additional pressing member, each pressing member comprising multi-segmented fingers, the lengths of which (e.g., denoted by L1a and L1b) are adjustable according to the sheet size. Another extension embodiment is characterized in that one pressing member is positioned at the leading edge region of the sheet, and the other pressing member is positioned at the trailing edge region of the sheet, thus maintaining a predetermined distance from the edge in each case. Another extension embodiment is characterized in that the pressing members may be symmetrical or mirror-symmetrical to each other. Another extension embodiment is characterized in that the pressing members may have identical structures. Another extension embodiment is characterized in that the segments of the pressing members are made of (metal) plates.

[0025] One extension is characterized in that the device may include an arrangement of several elements that function to press the sheets onto the conveyor table from above. Another extension is characterized in that these elements may be designed as balls, particularly as balls resembling golf clubs. Another extension is characterized in that a lifter may be present, which can be positioned in the conveying direction according to the sheet specifications and in doing so lifts at least one element and passively activates that element. Another extension is characterized in that the lifter is movably arranged on the linear guide or another linear guide. Another extension is characterized in that the lifter can be coupled to a lower pressure member, thereby positioning both in the conveying direction according to the sheet specifications. Another extension is characterized in that the coupling can be magnetically performed. Another extension is characterized in that a first magnet is present for the coupling. Another extension is characterized in that decoupling occurs at a stop. Another extension is characterized in that a second magnet is present for the decoupling. Another extension is characterized in that the coupling and decoupling occur at the stop. Another extension is characterized in that the lifter may be made of a (metal) plate.

[0026] One extension is characterized by the presence of a positioning element on the pressing member. Another extension is characterized by the positioning element being located on the side of the pressing member. A further extension is characterized by the positioning element extending along the conveying direction. Finally, a further extension is characterized by the positioning element having a length (e.g., denoted by L2) and the pressing member being positioned relative to the edge of the sheet by a distance of that length using the positioning element.

[0027] The features and combinations of features disclosed in the preceding sections on the technical field, the summary of the invention, and the extensions, as well as the following sections on embodiments, represent further advantageous extensions of the invention. Attached Figure Description

[0028] The accompanying drawings illustrate preferred embodiments and extensions of the invention. Corresponding features in the drawings are given the same reference numerals. For clarity, repeated reference numerals are omitted.

[0029] Figures 1 to 4 Perspective views of preferred embodiments of the pressing component of the device of the present invention are shown.

[0030] Figures 5a to 8b Perspective or top view of a preferred embodiment of the device of the present invention are shown respectively.

[0031] Figure 9a and 9b Partial perspective views of preferred embodiments of the device of the present invention are shown.

[0032] Figure 10 A schematic top view showing a preferred embodiment of a folding machine incorporating the device of the present invention. Detailed Implementation

[0033] Figure 10The diagram illustrates a folding machine 1, such as a bag folding machine, used for folding sheets 2, such as sheets made of paper, preferably conveyed in the form of so-called flakes 5 or flake flow. The folding machine has a first folding station 6 and a second folding station 8 immediately following it in the production process. Between these folding stations is a device 10 with a conveyor table 11, preferably with inclined conveyor rollers 12. Sheets leave the first folding station 6 along the output direction 7 and are supplied to the second folding station 8 along the supply direction 9 with sheet edge 3 in front and sheet edge 4 behind. The conveying direction 13 of sheet 2 is parallel to the supply direction 9 and parallel to the stop bar 14 and the ball bar 15 with ball 16 for sheet 2, i.e., sheet 2 undergoes a change of orientation in the area of ​​the conveyor table 11. Therefore, sheet 2 leaves the first folding station 6 along direction 7, reaches the conveyor table 11 and below the ball bar 15, and then impacts the stop bar 14; finally, sheet 2 is conveyed (further) along the stop bar 14 in the conveying direction 11 or 9. In this process, to prevent the sheet 2 from being disturbedly lifted from the conveyor table 10 given sheet specifications 2a, 2b (or only sections of sheet 2), at least one pressing member 20, preferably two pressing members 20 and 30, is provided or present, wherein this pressing member or these pressing members can be positioned in direction 13 according to the sheet specifications, and in particular can be moved and fixed (see movements 72 and 74). According to the invention, pressing members 20 and 30 each include multi-segmented fingers 21 and 31 (see later figures), wherein the length of each finger can be adjusted according to the sheet specifications. In addition, a lifter 50 is provided for the ball 16, which can also be positioned in direction 13 according to the sheet specifications, and in particular can be moved (see movement 76). The stop bar 14 and the ball bar 15 can also (preferably together) be positioned according to specifications, and in particular can be moved and fixed (see movement 77).

[0034] Figure 1 The pressure member 20 according to the invention shown includes a multi-segment finger member 21, which has a length of 21a (in the fully extended state shown in the figure). Specifically, the pressure member 20 includes: a first segment 22 with a lower side 22a, a second segment 23 with a lower side 23a, and a third segment 24 with a lower side 24a. The second segment 23 is pivotally arranged on the first segment 22 about a pivot 23b (see pivoting motion 70). The third segment 24 is pivotally arranged on the second segment 23 about a pivot 24b (see pivoting motion 71). Their respective lower sides together form a guide surface 25 for pressing the sheet during transport.

[0035] The pressing member 20 includes a feed funnel-shaped member 27, which (in the fully extended state shown in the figure) is composed of a feed area 28 of the third section 24 that is angled or inclined upward relative to the horizontal plane.

[0036] Furthermore, the pressing member 20 also includes a slider 43, which is designed as a perforated block and has a clamping element 44. Through this slider 43, the pressing member 20 can move along the linear guide device 40 (see...). Figures 5a to 8b For example, the track is positioned and fixed in the longitudinal direction 41 at a selected position corresponding to the page size. In addition, the slider 43 and the pressure member 20 can pivot as a whole about the pivot 73, thereby rotating from the active position to the inactive position or setting it to inactive.

[0037] Figure 1 A positioning element 60 with a length of 60a is also shown. By using the positioning element 60 (as a measure), the pressure member 20 can be positioned and fixed relative to the edge of the sheet at a distance corresponding to the length 60a.

[0038] Figure 2 Show Figure 1 The pressure member 20 shown is now partially folded according to different sheet specifications: the third section 24 is folded and the second section 23 is tilted upwards. The length 21a of the finger-like member 21 is therefore shortened. In this position, the feed funnel-like member 27 is formed by the lower side 23a of the second section 23.

[0039] Figure 3 Show Figure 1 and Figure 2 The pressing member 20 is shown, which is now fully folded according to different sheet specifications again: both the third section 24 and the second section 23 are folded up. The length 21a of the finger-shaped member 21 is thus shortened again. In this further position, the feed funnel-shaped member 27 is formed by the feed area 28 on the first section 22.

[0040] Figure 4 An alternative pressing member 20 is shown, which is not foldable but is telescopic. A multi-segmented finger member 21 is also provided, but its length 21a can be changed by moving segments 23 and 24. Segments 23 and 24 each have an inclined feed zone 28.

[0041] Figure 5a and 5b The same apparatus 10 according to the invention is shown. The apparatus includes a conveyor table 11 with a driven conveyor roller 12 that conveys sheets 2 of a specific size and / or a specific folding type along a conveying direction 13. The apparatus 10 also includes a stop bar 14 and a ball bar 15 with a (pressing) ball 16 for the sheets 2. The apparatus 10 has a longitudinal direction 41 and a transverse direction 42.

[0042] The device 10 shown in the figure includes two pressing members 20 and 30 according to the invention, each pressing member comprising multi-segmented fingers 21 and 31 (see figure). Figures 1 to 3The lengths 21a and 31a of the finger-like members can be changed, preferably by partial or complete folding.

[0043] Figure 6a and 6b The same device 10 is shown, but when conveying sheets 2 with different specifications and / or different folding types. It can be seen that, compared to... Figure 5a and Figure 5b In contrast, the two pressing members 20 and 30 are positioned differently (longitudinal dimension) and are also folded (lateral dimension). Therefore, the pressing members 20 and 30 are set according to the specification change and / or folding type change of page 2, and thus their lengths 21a or 31a also change.

[0044] Figures 5a to 6b The device 10 according to the invention is shown, for example, after the first folding station. Conversely, Figure 7a and 7b The device 10 according to the invention is shown, for example after the second folding station downstream, so that the sheet transport here is carried out in the opposite direction. Figure 7a and 7b The device 10 shown is configured for a different sheet size and / or a different folding type: for example, the two pressure members 20 and 30 can be seen to be positioned closer together. Figure 8a and 8b Also shown is the device 10 according to the invention after the second folding station. (To) Figures 5a to 8b The comparison shows that the two pressing elements 20 and 30 can be adjusted according to the longitudinal and transverse dimensions of the sheet 2 to be conveyed, based on the sheet size and / or folding type.

[0045] Figure 9a and 9b A lifter 50 is shown for lifting (which may not be necessary depending on the sheet size) the balls 16. The lifter 50 is preferably mounted on another linear guide 51, thus allowing adjustment along the longitudinal direction 41. The lifter 50 can be coupled to the pressure member 20 via a coupler 52, preferably via a first magnet 53 illustrated. In the coupled state, the lifter 50 moves together with the pressure member 20 or is adjusted according to the sheet size and / or folding type to be conveyed. In this case, some balls 16 that are not necessary according to the sheet size and / or folding type will automatically rise, thus no longer remaining on the sheet 2. However, for some sheets, it is necessary to decouple the pressure member 20 and the lifter 50. For this purpose, the lifter 50 can be decoupled at a stop (e.g., when the pressure member 20 moves outward), and preferably held at that stop by a second magnet 54 until the lifter 50 is coupled back to the pressure member 20 (e.g., when the pressure member 20 moves back). Thus, coupling and decoupling occur automatically as the pressure member 20 moves along the longitudinal direction 41 according to the position of the stop.

[0046] List of reference numerals 1 Folding machine 2 pages 2a Page specifications (length or portrait orientation) 2b page specifications (width or landscape orientation) 3. (Front) edge of the page 4. (Later) page edges 5 scales 6 First Folding Station 7 Output Direction 8 Second Folding Station 9. Supply Direction 10 Equipment 11 Conveyor tables, especially inclined roller tables 12 Conveyor Rollers 13 Conveying direction 14 Stop bars for sheets 15. The arrangement of components, especially the cue stick. 16 components, especially balls 20 Press-down component 21 Multi-section finger components 21a Length of the finger 22 Section 1 22a The lower side of the first section 23 Section 2 23a Lower side of the second section 23b Pivot of Section 2 24 Section 3 24a Lower side of the third section 24b Pivot of Section 3 25 guide surface 27 Feed funnel-shaped component 28 One (or more) feeding areas 30 Other pressing parts 31 Other multi-segment finger components 31a Length of the other finger-like component 40 Linear guidance devices, especially tracks 41 Vertical 42 Horizontal 43 Sliding component 44 Clamping elements 50 lifting device 51. Other linear guide devices 52. Coupling components, especially magnetic coupling components 53 First Magnet 54 Second magnet 60 Positioning elements The length L of the 60a positioning element 61 Other positioning elements 61a Length of the other positioning element 70 Section 2 (Pivoting or Linear) Motion 71 Section 3 (Pivoting or Linear) Motion 72. Linear motion of the pressing component 73. Pivoting motion of the pressing component 74. The (linear) motion of the other pressing component 76. The (linear) motion of the elevator 77. The (linear) motion of the stop bar and the cue stick.

Claims

1. An apparatus for conveying sheets in a folding machine, comprising a conveyor table (11) for sheets (2) and at least one pressing member (20) for sheets, said conveyor table having a conveying direction (13), said pressing member being capable of being positioned along the conveying direction (13) according to a first specification (2a) of the sheets (2), Its features are, The pressing member (20) includes a multi-section finger (21), wherein there is at least a first section (22) and a second section (23), wherein the second section (23) is movable relative to the first section (22), thereby allowing the length (21a) of the finger (21) to be adjusted according to the second specification (2b) of the sheet (2).

2. The device according to claim 1, characterized in that, The second section (23) is arranged on the first section (22).

3. The device according to claim 2, characterized in that, The second section (23) is capable of pivoting or moving relative to the first section (22).

4. The device according to any one of claims 1 to 3, characterized in that, The finger (21) includes a third section (24) which is movable relative to the second section (23), thereby allowing the length (21a) of the finger (21) to be adjusted according to the second specification (2b) of the page (2).

5. The device according to claim 4, characterized in that, The third section (24) is arranged on the second section (23).

6. The device according to claim 5, characterized in that, The third section (24) is capable of pivoting or moving relative to the second section (23).

7. The device according to any one of claims 1 to 3, characterized in that, The device (10) includes a linear guide (40) with its longitudinal direction (41) parallel to the conveying direction (13) and a slider (43) movably arranged on the linear guide (40) and the pressing member (20) arranged on the slider.

8. The device according to claim 7, characterized in that, The pressing member (20) is pivotally arranged on the linear guide device (40).

9. The device according to any one of claims 1 to 3, characterized in that, The pressing member (20) has a guide surface (25) for the sheet (2).

10. The device according to claim 9, characterized in that, The guide surface (25) includes a feed area (28).

11. The device according to any one of claims 1 to 3, characterized in that, The device (10) includes the pressing member (20) and at least one additional pressing member (30), each of which includes multi-segmented fingers (21, 31), the lengths (21a, 31a) of which are adjustable according to the second specification (2b) of the sheet (2).

12. The device according to any one of claims 1 to 3, characterized in that, The device (10) includes an arrangement of elements that function to press the sheet (2) onto the conveyor table (11) from above.

13. The device according to claim 12, characterized in that, The element is constructed as a sphere (16).

14. The device according to claim 12, characterized in that, There is a lifter (50) that is capable of positioning along the conveying direction (13) according to the first specification (2a) of the page (2) and in the process lifting at least one element and causing the element to passively perform its function.

15. The device according to claim 14, characterized in that, The lifting device (50) can be coupled to the pressing member (20) so that the two can be positioned together along the conveying direction (13) according to the first specification (2a) of the sheet (2).

16. The device according to claim 15, characterized in that, The coupling is performed magnetically.

17. The device according to claim 16, characterized in that, Decoupling is performed at stop (55).

18. The device according to any one of claims 1 to 3, characterized in that, Positioning elements (60) are arranged on the pressing member (20).

19. The device according to claim 18, characterized in that, The positioning element (60) has a length (60a) and the pressing member (20) is positioned relative to the edge of the sheet (3, 4) by a distance of the length (60a) by using the positioning element (60).

20. A folding machine comprising a first folding station (6) and a second folding station (8) arranged downstream in the production process, characterized in that, In the production process, a device (10) according to any one of the preceding claims is arranged between the first folding station (6) and the second folding station (8).

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