Device for conveying sheet in folding machine

Abstract

To enable format setting in a folding machine or its conveyance table to be performed without error.SOLUTION: A device for conveying a sheet in a folding machine, includes a conveyance table (11) for the sheet (2) having a conveyance direction (13), and at least one presser holder (20) for the sheet that can be positioned in the conveyance direction (13) according to a format of the sheet (2), wherein the presser holder (20) includes a multi-member finger (21), there is at least one of a first member and a second member, and the second member is relatively movable with respect to the first member such that a length (21a) of the finger (21) can be set according to the format of the sheet (2).SELECTED DRAWING: Figure 5a

Description

[Technical Field]

[0001] The present invention relates to a device for transporting sheets in a folder having the features of the preamble of claim 1, and to a folder including such a device.

[0002] The invention relates to the technical field of the graphic industry, in particular to the area of ​​folding flexible sheet-like substrates therein or to the area of ​​high-quality, high-productivity production of industrial folded products, such as booklets, preferably made of paper, cardboard, paperboard, plastic or composite materials, in particular from printed paper. The core of the invention relates to the unhindered transport of sheets in or through a folding machine. [Background technology]

[0003] The prior art is known for industrial folding machines, preferably including multiple folding units (folding stations) for producing folded products, e.g., sheet-like substrates, and a feed unit for transporting the folded products. The folding units may be, for example, buckle plate folding mechanisms and / or blade folding mechanisms, preferably for producing multiple folds. The feed unit may be, for example, a roller table with inclined feed rollers. Furthermore, such folding machines typically include a feeder for the sheets to be folded, e.g., a pile feeder, and a delivery for the folded products. The sheets to be folded can be fed to the first folding mechanism preferably as a stream, particularly preferably as a staggered stream. So-called staggered feeding between the folding units is also possible in high-end, high-end machines. Such folding machines also include a machine control unit in the form of a digital computer with control software.

[0004] In this case, the roller table is equipped with a so-called ruler-type device for aligning the conveyed sheet with the roller table and giving the conveyed sheet a predetermined (further) movement direction. Buckle plate folding mechanisms with two or more folding stations typically have a roller table downstream of the (first) folding mechanism to deflect the exiting sheet by 90° and convey it to the next (second) folding mechanism. To accelerate the sheet at high speeds and with little slip, a roller, usually spherical or conical, generates a normal force on the sheet from above. Pressure holder elements are used to ensure that the sheet reaches the ruler stop by moving downward on the sphere or roller. As such, an insert plate fixedly integrated into the ruler and a manually adjustable pressure holder are established, which the operator positions on the edge or surface of the sheet depending on the format. The use of additional pressure holders depends on factors such as the basis weight, folding method, or folding speed, among others.

[0005] High-end, high-end machines, such as the Stahlfolder TH82-P folding machine from Heidelberger Druckmaschinen AG, use ruler strips with spheres housed in holes in the strip (sphere strips or so-called "sphere rulers") for faster, staggered folding. A distinctive feature compared to the sheet transport of single-sheet machines without staggered folding is that the ruler's starting area is not completely equipped with spheres. This intentional omission of spheres allows the following sheet to slide more easily over the sheet below, thus facilitating the creation of the staggered fold and even contact with the ruler. In the area of ​​the front sheet corners adjacent to the ruler, several spheres are lifted by a slidable lifter. With a relatively large format width, the shifter is pushed further in the transport direction, thereby lifting more spheres. With a relatively small format width, the lifter is pushed less in the transport direction, thereby lifting fewer spheres. The lifter also closes the spherical recess in the spherical ruler on the underside of the spherical ruler, thereby preventing the leading sheet edge from getting caught and causing malfunctions. The lifter is set manually by the operator. A feature of staggered folding is that the sheet leaving the preceding station (folding station) is guided directly onto the roller table and parallel to it toward the ruler. The sheet lies flat during this transport, and the use of a pressure holder is particularly important here to prevent the sheet from lifting up. The TH82-P uses a pressure holder that is clamped to the ruler's insert plate. There is a long-length pressure holder configuration, which is used, for example, for symmetrical folding methods and long formats, and a short-length pressure holder configuration, which is used, for example, for asymmetrical folding methods and short sheet formats. When changing from long format to short format on the roller table, the long-length pressure holder must be manually replaced with the short-length pressure holder. In practice, it has been found that removed hold-down holders do not have an assigned storage location and are therefore often lost.If they are later lost in other formats, problems may occur during sheet transport. Additionally, the hold-down holders may be improperly installed or adjusted by the operator, which may cause problems with sheet transport. The lifters additionally need to be set by the operator to the current format to avoid misalignment errors due to excessive friction between sheets, or to avoid paper jams due to paper corners getting caught. In practice, it has been found that the required precise lifter positioning (for the format) is difficult for inexperienced operators, and errors can result in time-consuming machine shutdowns.

[0006] DE 102013107598 A1 discloses an apparatus for creasing paper sheets, which comprises an apparatus for conveying the sheets by means of conveying rollers with one conveying direction, and a movable and lockable pressure holder means, wherein the pressure holder means includes a sphere and an alignment means is arranged on the pressure holder means.

[0007] On the part of manufacturers engaged in an increasingly industrial operation of high-quality printed products, competing with each other in a constant, hard competition, there is a constant demand on manufacturers of (high-end) folding machines to continually improve such machines in order, on the one hand, to reduce the production costs of printed products and to avoid or at least reduce possible production dropouts, and, on the other hand, to further improve the already high quality of printed products. Further demands arise from the situation in which the shortage of skilled specialists is becoming increasingly pronounced. Therefore, these machines are often operated by unskilled operators, and yet here it is necessary to avoid operating errors, and this is the starting point of the present invention.

[0008] technical challenges SUMMARY OF THE INVENTION It is therefore an object of the present invention to achieve an improvement over the prior art, in particular to enable error-free implementation of formatting in a folder or in a folder's transport table.

[0009] Solution to the Problems of the Invention This problem is solved according to the invention by a device according to claim 1.

[0010] Advantageous and therefore preferred developments of the invention emerge from the dependent claims as well as from the description and drawings.

[0011] An apparatus for transporting sheets in a folding machine according to the invention, comprising a transport table for sheets having a transport direction and at least one presser holder for sheets positionable in the transport direction according to the format of the sheets, the presser holder includes a multi-member finger; wherein there is at least one first member and a second member; Here, the second member is characterized in that it is movable relative to the first member so that the length of the finger (for example, designated L1) can be set to suit the sheet format.

[0012] A folding machine using the device according to the invention, which has a first folding station and a second folding station arranged downstream in the production flow direction, is characterized in that the device according to the invention is arranged between the first and second folding stations in the production flow direction, where it can be assumed that the first folding station is a buckle plate folding station, the second folding station is a buckle plate folding station, the conveying direction of the transport table is transverse to the output direction of the first folding station and / or the conveying direction of the transport table is parallel to the feed direction of the second folding station.

[0013] Advantageous Configurations and Effects of the Invention The invention advantageously enables formatting in a folder or its transport table to be carried out without errors, and is used, for example, in industrial operating folders with staggered sheet transport.

[0014] The present invention allows an operator to quickly and easily adapt the pressure holders for sheet transport in a folding machine to various format lengths and widths without the need for tedious replacement or removal thereof. This, on the one hand, advantageously prevents the removed pressure holders from being reused or the wrong pressure holders from being used. On the other hand, it facilitates the selection of the correct format setting for operators, especially those with limited experience. Further specific advantages include improved ease of handling due to the quick and easy, tool-free sliding of the pressure holders to match the format width; the quick and easy, tool-free length adjustment of the pressure holders to match the format length, especially without the need for part replacement; the elimination of an additional setting process for the (spherical) lifter; and improved process reliability in the folding operation due to the correctly positioned pressure holders and the correctly positioned lifter.

[0015] The pressure holder is a (multi-piece) element used to hold down the sheet at the pressure holder's location on the transport table, i.e., to prevent the sheet from moving upwardly away from the transport table during transport. The length of the finger is preferably the effective length, i.e., the length of the section over which the pressure holder performs its function. This length is preferably measured transversely to the transport direction. The multi-piece design of the finger preferably involves the number of finger members, e.g., two or three, over which the pressure holder performs its function, at least one of which is movable, in particular swivelable, to allow the length to be set. The sheet format can be specified as a length (parallel to the transport direction) and a width (transverse to the transport direction), which can be changed by a folding process, e.g., a fold in half, depending on the folding station, and which can also swap the length and width values ​​during transport, e.g., by a 90° turn.

[0016] Developments of the invention In the following, preferred developments of the invention (developments for short) are described, which can also be combined with one another, unless technically excluded.

[0017] A development may be characterized in that the second member is arranged on the first member. A development may be characterized in that the second member is pivotable relative to the first member. A development may be characterized in that a disc spring is present, which generates a stop between the second member and the first member. A development may be characterized in that at least one stop is present for the second member. A development may be characterized in that the stop is arranged on the first member.

[0018] A development may be characterized in that the second member is slidable relative to the first member.A development may be characterized in that the second member is slidable in a telescopic manner relative to the first member.

[0019] A further development may be characterized in that the multi-member finger includes a third member, which is movable relative to the second member such that the length of the finger can be set to the sheet format. A further development may be characterized in that the third member is arranged on the second member. A further development may be characterized in that the third member is pivotable relative to the second member. A further development may be characterized in that the third member is pivotable together with the second member. A further development may be characterized in that a disc spring is present that creates a stop between the third member and the second member, or in that a further disc spring is present that forms a stop between the third member and the second member. A further development may be characterized in that at least one further stop is present for the third member. A further development may be characterized in that the further stop is arranged on the second member.

[0020] A development may be characterized in that the third member is slidable relative to the second member.A development may be characterized in that the third member is slidable in a telescopic manner relative to the second member.

[0021] A further development may be characterized in that the device comprises a linear guide, the longitudinal direction of which extends parallel to the conveying direction, and a slider slidably arranged on the linear guide, on which a pressure holder is arranged. A further development may be characterized in that the linear guide can be positioned transversely to the conveying direction of the sheet in accordance with the sheet format. A further development may be characterized in that the linear guide is configured as a rail. A further development may be characterized in that the rail is configured as a round bar. A further development may be characterized in that the slider comprises a clamping element, such as a clamping screw, by means of which the slider can be locked to the rail. A further development may be characterized in that the pressure holder is arranged pivotably on the linear guide. A further development may be characterized in that a stop is present for pivoting.

[0022] In one development, the presser holder may have a guide surface for the sheet. In one development, the guide surface may be inclined upward relative to the horizontal. In one development, the guide surface may form the upper surface of an inlet hopper for the sheet. In one development, the guide surface may be formed by the underside of the first member. In one development, the guide surface may be formed by the underside of the first member and the underside of the second member. In one development, the guide surface may be formed by the underside of the first member, the underside of the second member, and the underside of the third member. In one development, the guide surface may be a flat, stepless surface. In one development, the guide surface may include an inlet region. In one development, the inlet region may be inclined upward more than the guide surface. In one development, the inlet region may be formed in the first member. A development can be characterized in that the inlet area is formed by the second element.A development can be characterized in that the inlet area is formed in the third element.

[0023] A development can be characterized in that the transport table is a tilting roller table.

[0024] A further development may be characterized in that the device has a pressure holder and at least one further pressure holder, each of which includes one multi-member finger, the length of each of which (e.g., indicated by the symbols L1a and L1b) being settable to suit the sheet format. A further development may be characterized in that one pressure holder is positioned in the region of the leading edge of the sheet and the other pressure holder is positioned in the region of the trailing edge of the sheet, each being maintained at a predetermined distance from the edge. A further development may be characterized in that the pressure holders are symmetrical or mirror-symmetrical to one another. A further development may be characterized in that the pressure holders are structurally identical. A further development may be characterized in that the elements of the pressure holder are manufactured from sheet metal.

[0025] In one development, the device may include an assembly of elements whose function is to press the sheet against the conveying table from above. In one development, the elements may be formed as spheres, in particular as spheres of spherical strips. In one development, a lifter is present that can be positioned in the conveying direction to match the sheet format, with at least one element being lifted and passively setting its function. In one development, the lifter is slidably arranged on a linear guide or a further linear guide. In one development, the lifter can be coupled to a pressure holder such that both can be positioned together in the conveying direction to match the sheet format. In one development, the coupling can be performed magnetically. In one development, a first magnet is present for coupling. In one development, decoupling can occur at a stop. In one development, a second magnet is present for decoupling. In one development, the coupling and decoupling can occur at a stop. A development can be characterized in that the lifter is manufactured from sheet metal.

[0026] A development can be characterized in that a positioning element is arranged on the pressure holder. A development can be characterized in that the positioning element is arranged laterally on the pressure holder. A development can be characterized in that the positioning element extends in the conveying direction. A development can be characterized in that the positioning element has a length (e.g., denoted by the symbol L2), and the pressure holder is positioned at a distance of the length from the sheet edge using the positioning element.

[0027] The features and combinations of features disclosed in the above technical fields, inventions and developments sections, and in the following examples section, in any combination with one another, represent further advantageous embodiments of the present invention. Examples and drawings of the present invention

[0028] Examples and drawings of the present invention These drawings show preferred embodiments and developments of the invention, in which corresponding features are designated by the same reference numerals, and for the sake of clarity, some overlapping reference numerals have been omitted in the drawings. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a perspective view showing a preferred embodiment of a presser holder of a device according to the present invention; [Figure 2] 1 is a perspective view showing a preferred embodiment of a presser holder of a device according to the present invention; [Figure 3] 1 is a perspective view showing a preferred embodiment of a presser holder of a device according to the present invention; [Figure 4] 1 is a perspective view showing a preferred embodiment of a presser holder of a device according to the present invention; [Figure 5a] 1 is a perspective view of a preferred embodiment of the device according to the invention; [Figure 5b] 1 is a plan view of a preferred embodiment of the device according to the invention; [Figure 6a] 1 is a perspective view of a preferred embodiment of the device according to the invention; [Figure 6b] 1 is a plan view of a preferred embodiment of the device according to the invention; [Figure 7a] 1 is a perspective view of a preferred embodiment of the device according to the invention; [Figure 7b] 1 is a plan view of a preferred embodiment of the device according to the invention; [Figure 8a] 1 is a perspective view of a preferred embodiment of the device according to the invention; [Figure 8b] 1 is a plan view of a preferred embodiment of the device according to the present invention; [Figure 9a] 1 is a perspective view of a portion of a preferred embodiment of an apparatus according to the present invention; [Figure 9b] 1 is a perspective view of a portion of a preferred embodiment of an apparatus according to the present invention; [Figure 10] 1 is a schematic plan view of a preferred embodiment of a folder equipped with a device according to the invention;

[0030] FIG. 10 shows a folding machine 1, such as a buckle-plate folding machine, using the invention for folding sheets 2, for example made of paper, preferably delivered in a so-called staggered stack 5 or staggered stack, with a first folding station 6 and a subsequent second folding station 8 in the production flow direction. Between these folding stations, a device 10 with a conveying table 11 and preferably inclined conveying rollers 12 is arranged. The sheets emerge from the first folding station 6 in output direction 7 and are fed with their leading and trailing sheet edges 3 and 4 in feed direction 9 to the second folding station 8. The conveying direction 13 of the sheets 2 is parallel to the feed direction 9 and parallel to the stop strip 14 for the sheets 2 and to the spherical strip 15 with the spheres 16. In other words, the sheets 2 undergo a change of direction in the area of ​​the conveying table 11. Thus, the sheets 2 leave the first folding station 6 in direction 7 and reach the conveying table 11, passing under the spherical strip 15 and then coming into contact with the stop strip 14. Finally, the sheet 2 is (further) fed at the stop strip 14 along the conveying direction 11 or 9. To prevent the sheet 2 of a given sheet format 2a, 2b (or only a section of the sheet 2) from being lifted off the conveying table 10 during this process, at least one pressure holder 20, preferably two pressure holders 20 and 30, are provided or present. These pressure holders are positionable, particularly slidable and lockable, in the direction 13 depending on the format (see movements 72 and 74). The pressure holders 20 and 30 each include multi-member fingers 21 and 31 according to the invention (see further drawings), the length of each finger being adjustable to the sheet format. Additionally, a lifter 50 for the spheres 16 is provided or present, which is likewise positionable, particularly slidable, in the direction 13 depending on the format (see movement 76). The stopper strip 14 and the ball strip 15 are preferably also together positionable, in particular slidable and lockable depending on the format (see action 77).

[0031] The presser foot holder 20 according to the invention shown in FIG. 1 includes a multi-member finger 21 having a length 21a (in the fully extended state shown). The presser foot holder 20 includes, inter alia, a first member 22 having a lower surface 22a, a second member 23 having a lower surface 23a, and a third member 24 having a lower surface 24a. The second member 23 is arranged on the first member 22 so as to be pivotable about a pivot axis 23b (see pivoting movement 70). The third member 24 is arranged on the second member 23 so as to be pivotable about a pivot axis 24b (see pivoting movement 71). The respective lower surfaces here together form a guide surface 25 for the sheet to be held down during transport.

[0032] The presser holder 20 includes an inlet hopper 27 which (in the fully extended position shown) is formed by an inlet region 28 of the third member 24 that is angled or sloped upward relative to the horizontal.

[0033] Furthermore, the presser holder 20 includes a slider 43 formed as a block with a hole and having a clamping element 44. By means of this slider 43, the presser holder 20 can be positioned in the longitudinal direction 41 along a linear guide 40, such as a rail (see Figures 5a to 8b), and can be locked in a selected position corresponding to the sheet format. Furthermore, the slider 43, and thus the entire presser holder 20, can be pivoted about a pivot axis 73 and in this way can be pivoted from an active position to an inactive position or set to inactive.

[0034] 1 also shows a positioning element 60 having a length 60a. Using the positioning element 60 (as a scale), the presser holder 20 can be positioned and locked at a distance corresponding to the length 60a from the sheet edge.

[0035] 2 shows the pressure holder 20 shown in FIG. 1, now partially folded to accommodate another sheet format, i.e., the third member 24 is folded and the second member 23 is tilted upward. The length 21a of the fingers 21 is therefore reduced. In this position, the inlet hopper 27 is formed by the lower surface 23a of the second member 23.

[0036] 1 and 2, but now fully folded again to accommodate another sheet format, i.e., with the third element 24 and the second element 23 folded. The length 21a of the fingers 21 is therefore again reduced. In this further position, the inlet hopper 27 is formed by the inlet region 28 of the first element 22.

[0037] 4 shows an alternative presser holder 20 that is configured to be telescopic rather than collapsible. Again, a multi-member finger 21 is provided, but its length 21a can be changed by sliding members 23 and 24. Members 23 and 24 each have a sloped inlet area 28.

[0038] 5a and 5b show the same device 10 according to the invention. The device comprises a transport table 11 with driven transport rollers 12, which deliver sheets 2 of a particular format and / or a particular folding type in a transport direction 13. Furthermore, the device 10 comprises a stop strip 14 and a ball strip 15 with (holding) balls 16 for the sheets 2. The device 10 has a longitudinal direction 41 and a transverse direction 42.

[0039] The illustrated device 10 includes two presser holders 20 and 30 according to the invention, each of which includes one multi-member finger 21 or 31 (see Figures 1 to 3), wherein the length 21a and 31a of each of these fingers is preferably variable by partial or complete folding.

[0040] 6a and 6b show the same apparatus 10, but during the transport of a sheet 2 having a different format and / or a different folding method. It can be seen that the two pressure holders 20 and 30 are positioned elsewhere (longitudinal format) and also folded (transverse format) compared to FIGS. 5a and 5b. The pressure holders 20 and 30 are thereby set according to the changed format and / or changed folding method of the sheet 2, and therefore the pressure holders 20 and 30 have changed lengths 21 a or 31 a.

[0041] 5a-6b show the device 10 according to the invention downstream of, for example, a first folding station. In contrast, FIGS. 7a-7b show the device 10 according to the invention downstream of, for example, a second folding station, so that the sheet transport now takes place in the reverse direction. It can be seen that the device 10 shown in FIGS. 7a-7b is configured for a further sheet format and / or a further folding method, i.e., the two pressure holders 20 and 30 are positioned close to each other, for example. FIGS. 8a-8b also show the device 10 according to the invention downstream of the second folding station. A comparison with FIGS. 5a-8b reveals that the two pressure holders 20 and 30 can be configured for the longitudinal and lateral formats of the sheet 2 to be transported, depending on the sheet format and / or folding method.

[0042] 9a and 9b show a lifter 50 for lifting spheres 16 (which may not be needed depending on the format). This lifter 50 is preferably arranged on a further linear guide 51 and is thereby adjustable in the longitudinal direction 41. The lifter 50 can be connected to the pressure holder 20 by means of a connection 52, preferably via the first magnet 53 shown. In the connected state, the lifter 50 is set to the format and / or folding method to be moved or transported together with the pressure holder 20. In this case, some of the spheres 16 that are not needed depending on the format and / or folding method are then automatically lifted and are no longer placed on the sheet 2. However, for certain formats, it is necessary to disconnect the pressure holder 20 from the lifter 50. Thus, the lifter 50 is decoupled at the stopper (e.g., during forward movement of the presser holder 20) and preferably remains positioned at the stopper by the second magnet 54 until the lifter 50 is recoupled to the presser holder 20 (e.g., as the presser holder 20 returns). Thus, this coupling and decoupling occurs automatically depending on the position of the stopper as the presser holder 20 moves in the longitudinal direction 41. [Explanation of symbols]

[0043] 1 folding machine 2 seats 2a Sheet format (length or longitudinal format) 2b Sheet format (width or landscape format) 3 (Tip side) Sheet edge 4 (rear end) seat edge 5. Overlapped 6 First folding station 7 Output Direction 8 Second Folding Station 9 Supply direction 10 equipment 11 Conveyor table, especially tilt roller table 12 Conveyor roller 13 Conveying direction 14 Seat stop strip 15. Assembly of elements, especially spherical strips 16 Elements, especially the spheres 20 Presser holder 21 Multi-component finger 21a Finger length 22 First member 22a Lower surface of the first member 23 Second member 23a Lower surface of second member 23b Pivot axis of second member 24 Third Component 24a Lower surface of the third member 24b Pivot axis of third member 25 Guide surface 27 Inflow hopper 28 Inflow area 30 Additional pressure holder 31 Further multi-component fingers 31a Additional finger length 40 Linear guides, especially rails 41 Longitudinal 42 Horizontal 43 Slider 44 clamping elements 50 Lifter 51 More Linear Guides 52 Connections, especially magnetic 53 First Magnet 54 Second Magnet 60 Positioning Elements 60a Length of positioning element L 61 Further positioning elements 61a Length of further positioning elements 70 (Pivotal or linear) movement of the second member; 71 (Pivotal or linear) movement of a third member 72 (Linear) movement of the pressure holder 73 (Pivoting) movement of the clamp holder 74 Further (linear) movement of the pressure holder 76 Lifter (linear) movement 77 (Linear) motion of stopper strips and spherical strips

Claims

1. 1. An apparatus for transporting sheets in a folder, comprising: a conveying table (11) having a conveying direction (13) for the sheet (2); and at least one presser holder (20) for the sheet (2) that can be positioned in the conveying direction (13) according to the format (2a) of the sheet (2), The presser holder (20) includes a multi-member finger (21), There is at least one first member (22) and a second member (23); The device is characterized in that the second member (23) is movable relative to the first member (22) so that the length (21a) of the fingers (21) can be set to suit the format (2b) of the sheet (2).

2. 2. The apparatus of claim 1, wherein the second member (23) is disposed on the first member (22).

3. 3. The device of claim 2, wherein the second member (23) is pivotable or slidable relative to the first member (22).

4. 4. The device according to claim 1, wherein the multi-member finger (21) comprises a third member (24) that is movable relative to the second member (23) so that the length (21a) of the finger (21) can be set to suit the format (2b) of the sheet (2).

5. The apparatus of claim 4, wherein the third member (24) is disposed on the second member (23).

6. 6. The device of claim 5, wherein the third member (24) is pivotable or slidable relative to the second member (23).

7. 7. The device (10) according to claim 1, further comprising a linear guide (40) whose longitudinal direction (41) extends parallel to the conveying direction (13), and a slider (43) slidably arranged on the linear guide (40), on which the presser holder (20) is arranged.

8. 8. The device according to claim 7, wherein the presser holder (20) is pivotably arranged on the linear guide (40).

9. 9. The device according to claim 1, wherein the presser holder (20) has a guide surface (25) for the sheet (2).

10. 10. The device of claim 9, wherein the guide surface (25) comprises an inlet area (28).

11. 11. The device (1) according to claim 1, further comprising the presser holder (20) and at least one further presser holder (30), each of which includes one multi-member finger (21, 31), the length (21a, 31a) of each of which can be set to suit the format (2b) of the sheet (2).

12. 12. The device (1) according to claim 1, comprising an assembly of a plurality of elements (15), the function of which is to press the sheet (2) from above onto the conveying table (11).

13. 13. The device according to claim 12, wherein the element (6) is formed as a sphere (16).

14. 14. The device according to claim 1, further comprising a lifter (50) that can be positioned in the conveying direction (13) to match the format (2a) of the sheet (2), and that lifts at least one element (16) and passively sets its function.

15. 15. The device according to claim 14, wherein the lifter (50) is connectable to the presser holder (20) so that both of them can be positioned together in the conveying direction (13) in accordance with the format (2a) of the sheet (2).

16. 16. The device of claim 15, wherein the coupling is magnetic.

17. 17. The device according to claim 16, wherein the decoupling occurs at the stop (55).

18. 18. The device according to claim 1, wherein a positioning element (60) is arranged on the presser holder (20).

19. 19. The device according to claim 18, wherein the positioning element (60) has a length (60a), and the presser holder (20) is positioned at a distance of the length (60a) from the sheet edge (3, 4) 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 direction of the product flow, 20. A folding machine, characterized in that the device (10) according to any one of claims 1 to 19 is arranged between the first folding station (6) and the second folding station (8) in the production flow direction.

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