Device for conveying sheets in folding machine

Abstract

The invention relates to a device for conveying sheets in a folding machine and the folding machine. The device comprises a conveying table (11) for the sheet (2), which has a conveying direction (13), and at least one pressing member (20) for the sheet, which can be positioned in the conveying direction (13) according to the specification (2a) of the sheet (2), characterized in that the pressing member (20) comprises a multi-segment finger (21), of which at least a first segment (22) and a second segment (23) are present, wherein the second section (23) is movable relative to the first section (22) such that the length (21a) of the finger (21) can be adjusted according to the specification (2b) of the sheet (2). The invention advantageously makes it possible to carry out specification adjustments without errors on the folding machine or on the conveyor table thereof. The invention can be used, for example, for industrial folding machines with scale-type sheet conveyance.

Description

TECHNICAL FIELD

[0001] The invention relates to a device for conveying a sheet in a folding machine and to a folding machine comprising the device.

[0002] The invention belongs to the field of graphic industry technology, in particular to the field of folding of flexible sheet-shaped printing substrates, or to the field of manufacturing of folded products, i.e. of high quality and high productivity, such as brochures, which preferably consist of paper, paperboard, card, plastic or composite material, in particular printed paper. In essence, the invention relates to the disturbance-free conveying of a sheet in a folding machine or the disturbance-free conveying of a sheet through a folding machine. BACKGROUND

[0003] In the prior art, it is known that industrial folding machines, preferably with a plurality of folding units (folding stations), are used for producing folded products from sheet-shaped printing substrates, which consist, for example, of paper, and with conveying units for moving the folded products. For example, the folding units can be pocket folding units and / or knife folding units for producing, preferably, a plurality of folds. The conveying units can be, for example, roller tables with inclined conveying rollers or the like. Such folding machines usually also comprise a feeder, for example a stack feeder, for the sheets to be folded, and a receiver for the folded products. The sheets to be folded are preferably conveyed in the form of a stream and particularly preferably in the form of a scale stream to the first folding unit. In high-end machines, the conveying between the folding units can also be a so-called scale conveying. Furthermore, such folding machines also comprise a machine control system in the form of a digital computer with control software.

[0004] Here, a so-called scale is usually used on the roller table in order to align the conveyed sheets and to determine their (further) direction of movement. Pocket folding machines with more than one folding station usually have a roller table downstream of the (first) folding unit in order to deflect the output sheets by 90° and to convey them to the next (second) folding unit. In order to accelerate the sheets quickly and with low slip, balls or conical rollers usually generate a normal force on the sheets from above. In order to ensure that the sheets safely reach under the balls or rollers and to the stop on the scale, a hold-down element is used. For this purpose, an insert plate is provided which is fixedly mounted on the scale and a manually adjustable hold-down (which the operator can position above the sheet edge or above the sheet surface depending on the format) is provided. Whether an additional hold-down is used depends on factors such as grammage, folding type and folding speed.

[0005] In order to achieve faster shingle folding on high-end machines, such as the Stahlfolder TH82-P folding machine from Heidelberg Druckmaschinen GmbH, a rod is used which is provided with balls in the holes (ball rod or so-called "ball scale"). One feature of this machine compared to a single sheet machine without shingle arrangement is that the scale is not completely equipped with balls in the initial area. The targeted omission of balls makes it easier for the following sheet to slide onto the sheet lying underneath it, thus establishing the shingle flow more easily and impacting the scale more evenly. In the corner area of the front sheet against the scale, some of the balls are lifted by slidable lifters. At a larger format width, the sheet pusher is pushed further in the conveying direction, so that more balls are lifted; at a smaller format width, the lifters are pushed less in the conveying direction, so that fewer balls are lifted. In addition, the lifters also close the scale ball recesses on the underside of the scale, thus preventing the front edge of the sheet from hooking on the scale and causing a malfunction. The lifters are adjusted manually by the operator. A feature of the shingle folding is that the sheet leaving the previous station (folding station) is guided directly onto the roller table and then slides parallel to the roller table in the direction of the scale: during this conveying process, the sheet lies flat, so that the use of a hold-down to prevent the sheet from lifting is particularly important. The hold-down used by the TH82-P is clamped to the scale's insertion plate. There are long and short versions of the hold-down, the long version being used, for example, for the symmetrical folding type and long formats; the short version is used for the asymmetrical folding type and short formats. When changing from a long format to a short format on the roller table, the long hold-down must be exchanged by hand for the short hold-down. It has been shown in practice that the hold-down removed does not have a designated storage location and is therefore often lost. If this hold-down is missing during the conveying of sheets of other formats, problems can arise. In addition, the operator can incorrectly install or adjust the hold-down, thus influencing the sheet conveying. The operator must also adjust the lifters depending on the current format in order to avoid shingle formation malfunctions due to too much friction between the sheets or paper jams due to the corners of the sheets being hooked. It has been shown in practice that it is difficult for inexperienced operators to make the required (format) precise positioning of the lifters, and that errors lead to costly machine downtimes.

[0006] DE 10 2013 107 598 B3 discloses a device for grooving sheets, with a device for conveying the sheets, comprising a conveying roller with a conveying direction and a hold-down which is movable and fixable, wherein the hold-down comprises balls and a directional device is arranged on the hold-down.

[0007] The increasing number of industrial producers of high-quality printed products are in constant and intense competition with each other, and they constantly demand (high-end) folding machine manufacturers to constantly improve such machines, first of all in order to reduce the production costs of printed products, to avoid or at least reduce possible downtimes, and secondly in order to further improve the already high quality of printed products. Another reason is the increasing shortage of trained professionals. Therefore, the machines are usually operated by less trained personnel, but operating errors must still be avoided. This is the meaning of the present invention. SUMMARY

[0008] Therefore, the task of the present invention is to improve the prior art, in particular to make it possible to make a format setting on a folding machine or its conveying table without errors.

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

[0010] Advantageous and therefore preferred developments of the invention result from the alternative solutions, the description and the drawings.

[0011] According to the invention, a device for conveying a sheet in a folding machine is proposed, comprising a conveying table for the sheet with a conveying direction and at least one pressure element for the sheet, which can be positioned in the conveying direction depending on the format of the sheet, characterized in that the pressure element comprises a multi-segmented finger, wherein at least a first segment and a second segment are present, wherein the second segment can be moved relative to the first segment, so that the length of the finger (for example denoted by L1) can be adjusted depending on the format of the sheet.

[0012] A folding machine using the device according to the invention comprises a first folding station and a second folding station arranged downstream in the production flow, characterized in that the device according to the invention is arranged between the first folding station and the second folding station in the production flow. Here, it can be provided that the first folding station is a bag folding station, the second folding station is a bag folding station, the conveying direction of the conveying table is transverse to the output direction of the first folding station, and / or the conveying direction of the conveying table is parallel to the supply direction of the second folding station.

[0013] Advantageous design and effects of the invention

[0014] The invention makes it possible in an advantageous manner to make a format adjustment on a folding machine or its conveying table without errors. For example, the invention can be used in industrial folding machines with a scale-type conveying device.

[0015] The invention enables the operator to quickly and easily adapt the downpresses in the folding machine for sheet transport to different format lengths and format widths without having to laboriously exchange or remove them. On the one hand, this advantageously prevents removed downpresses from being reinserted or incorrect downpresses from being used. On the other hand, this also makes it easier for the operator to select the correct format setting, especially in the case of insufficient setting experience. Other specific advantages: quick, simple, tool-free movement of the downpresses according to the format width, increased operating friendliness; quick, simple, tool-free adaptation of the length of the downpresses according to the format length, in particular without having to exchange parts; elimination of the additional adjustment process of the (ball) elevators; increased reliability of the folding operation due to the correct positioning of the downpresses and the downpresses.

[0016] The downpress is a (multi-section) element for pressing the sheet at the location of the downpress onto the transport table, i.e. preventing the sheet from moving upward away from the transport table during the transport. The length of the finger is preferably the effective length, i.e. the length of the distance that causes the downpress function of the downpress. This length is preferably measured in a direction transverse to the transport direction. The number of sections of the finger is preferably the number of sections of the finger that have a downpress function, for example 2 sections or 3 sections, wherein at least one section is movable, in particular pivotable, in order to be able to adjust the length. The format of the sheet can be given as length (parallel to the transport direction) and width (transverse to the transport direction); due to the folding process after each folding station, this format can change, for example halve; at the same time, the values of the length and the width can also change due to a change in direction during the transport, for example by 90°.

[0017] Embodiments of the invention

[0018] In the following, preferred embodiments of the invention (in short: embodiments) are described. These embodiments can also be combined with each other, if technically not impossible.

[0019] One embodiment is characterized in that the second section can be arranged on the first section. One embodiment is characterized in that the second section is pivotable relative to the first section. One embodiment is characterized in that a disc spring can be present, which creates an escapement between the second section and the first section. One embodiment is characterized in that at least one stop for the second section can be present. One embodiment is characterized in that the stop can be arranged on the first section.

[0020] One embodiment is characterized in that the second section is movable relative to the first section. One embodiment is characterized in that the second section is telescopically movable relative to the first section.

[0021] One refinement provides that the multi-part finger can comprise a third section which is movable relative to the second section, so that the length of the finger can be adjusted to the format of the sheet. One refinement provides that the third section can be arranged on the second section. One refinement provides that the third section is rotatable relative to the second section. One refinement provides that the third section is rotatable together with the second section. One refinement provides that a further disc spring can be present which creates an escapement between the third section and the second section. One refinement provides that at least one further stop for the third section is present. One refinement provides that the further stop is arranged on the second section.

[0022] One refinement provides that the third section is movable relative to the second section. One refinement provides that the third section is telescopically movable relative to the second section.

[0023] One refinement provides that the device comprises a linear guide which is oriented parallel to the conveying direction and on which a slide is arranged The slide is arranged movably on the linear guide, and a presser is arranged on the slide. One refinement provides that the linear guide can be positioned according to the format of the sheet transversely to the conveying direction of the sheet. One refinement provides that the linear guide can be designed as a rail. One refinement provides that the rail can be designed as a round bar. One refinement provides that the slide can comprise a clamping element, for example a clamping screw, by means of which the slide can be fixed on the rail. One refinement provides that the presser is arranged rotatably on the linear guide. One refinement provides that a stop for the rotation is present.

[0024] One refinement provides that the presser can have a guide surface for the sheet. One refinement provides that the guide surface is inclined upward relative to the horizontal. One refinement provides that the guide surface can form the upper side of an infeed funnel for the sheet. One refinement provides that the guide surface can be formed by the lower side of the first section. One refinement provides that the guide surface can be formed by the lower side of the first section and the lower side of the second section. One refinement provides that the guide surface can be composed of the lower side of the first section, the lower side of the second section and the lower side of the third section. One refinement provides that the guide surface can be a flat, stepless surface. One refinement provides that the guide surface can comprise an infeed region. One refinement provides that the infeed region can be inclined more upward than the guide surface. One refinement provides that the infeed region can be formed on the first section. One refinement provides that the infeed region is formed by the second section. One refinement provides that the infeed region is formed on the third section.

[0025] A feature of one development is that the transport table can be an inclined roller table.

[0026] A feature of one development is that the device can have the lower pressure element and at least one further lower pressure element, each comprising a multi-segmented finger, the individual lengths of which (e.g. denoted by Lla and Llb) can be adapted to the format of the sheet. A feature of one development is that one lower pressure element is positioned in the area of the leading edge of the sheet and the other lower pressure element is positioned in the area of the trailing edge of the sheet, thus in each case maintaining a predetermined distance from the edge. A feature of one development is that the lower pressure elements can be symmetrical or mirror-symmetrical to one another. A feature of one development is that the lower pressure elements can be identical in construction. A feature of one development is that the segments of the lower pressure elements are made of sheet metal.

[0027] A feature of one development is that the device can comprise an arrangement of elements whose function is to press the sheet from above onto the transport table. A feature of one development is that the elements can be designed as balls, in particular as balls of a billiard cue. A feature of one development is that there can be a lifter which can be positioned in the transport direction in accordance with the format of the sheet and in the process lifts at least one element and causes it to act passively. A feature of one development is that the lifter is movably arranged on the linear guide or on a further linear guide. A feature of one development is that the lifter can be coupled with the lower pressure element, so that both are positioned in the transport direction in accordance with the format of the sheet. A feature of one development is that the coupling can take place magnetically. A feature of one development is that there is a first magnet for the coupling. A feature of one development is that the decoupling takes place at a stop. A feature of one development is that there is a second magnet for the decoupling. A feature of one development is that the coupling and the decoupling take place at a stop. A feature of one development is that the lifter can be made of sheet metal.

[0028] A feature of one development is that a positioning element can be arranged on the lower pressure element. A feature of one development is that the positioning element can be arranged on the side of the lower pressure element. A feature of one development is that the positioning element can extend in the transport direction. A feature of one development is that the positioning element can have a length (e.g. denoted by L2) and the lower pressure element is positioned at a distance of this length from the edge of the sheet by using the positioning element.

[0029] The features and combinations of features disclosed in the foregoing technical field, summary and development sections, as well as in the following embodiments section, in any combination, represent further advantageous developments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0030] 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.

[0031] Figures 1 to 4 Perspective views of preferred embodiments of the pressing member of the device of the present invention are shown.

[0032] Figures 5a to 8b Perspective or top view of a preferred embodiment of the device of the present invention are shown respectively.

[0033] Figure 9a and 9b Partial perspective views of preferred embodiments of the device of the present invention are shown.

[0034] Figure 10 A schematic top view showing a preferred embodiment of a folding machine incorporating the device of the present invention. Detailed Implementation

[0035] Figure 10An folding machine 1 according to the application, for example a pocket folding machine, is shown for folding a sheet 2, for example a sheet made of paper, which is preferably fed in the form of a so-called scale 5 or scale flow, with a first folding station 6 and a second folding station 8 following directly in the production flow. Between these folding stations there is arranged a device 10 with a conveying table 11, preferably an inclined conveying roller 12. The sheet leaves the first folding station 6 in the output direction 7 and is supplied to the second folding station 8 in the sheet edge 3 in front and sheet edge 4 behind manner in the supply direction 9. The conveying direction 13 of the sheet 2 is parallel to the supply direction 9 and to the stop bar 14 for the sheet 2 and the ball bar 15 with the ball 16, i.e. the sheet 2 undergoes a change of direction in the area of the conveying table 11. Thus, the sheet 2 leaves the first folding station 6 in the direction 7, reaches under the conveying table 11 and the ball bar 15 and then hits the stop bar 14; finally, the sheet 2 is (further) conveyed along the stop bar 14 in the conveying direction 11 or 9. In the process, in order to prevent the sheet 2 from being lifted off the conveying table 10 in an interfering manner in the case of a given sheet format 2a, 2b (or only a section of the sheet 2), there is provided or present at least one presser 20, preferably two pressers 20 and 30, wherein this presser or these pressers can be positioned in the direction 13, in particular can be moved and fixed, depending on the sheet format (see movements 72 and 74). According to the application, the pressers 20 and 30 each comprise a multi-sectioned finger 21 and 31 (see later figures), wherein the length of the respective finger can be adjusted depending on the format of the sheet. Furthermore, the ball 16 is also equipped with a lifter 50, which can also be positioned in the direction 13, in particular can be moved, depending on the format of the sheet (see movement 76). The stop bar 14 and the ball bar 15 can also be positioned, preferably jointly, depending on the format, in particular can be moved and fixed (see movement 77).

[0036] Figure 1 The shown presser 20 according to the application comprises a multi-sectioned finger 21, which has a length 21a (in the fully extended state shown in the figures). In particular, the presser 20 comprises a first section 22 with a lower side 22a, a second section 23 with a lower side 23a and a third section 24 with a lower side 24a. The second section 23 is pivotably arranged on the first section 22 about a pivot axis 23b (see pivoting movement 70). The third section 24 is pivotably arranged on the second section 23 about a pivot axis 24b (see pivoting movement 71). The respective lower sides together form a guide surface 25 for pressing the sheet during conveying.

[0037] The presser 20 comprises an infeed funnel 27, which (in the fully extended state shown in the figures) consists of an infeed region 28 of the third section 24, which is angled or upwardly inclined with respect to the horizontal.

[0038] 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. Furthermore, the slider 43 and the pressure member 20 can pivot as a whole around the pivot 73, thereby rotating from an active position to an inactive position or being set to inactive.

[0039] Figure 1 A positioning element 60 of length 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Figure 5a and 5b The same device 10 according to the invention is shown. The device 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 device 10 also includes a stop bar 14 and a ball bar 15 with a (pressing) ball 16 for the sheets 2. The device 10 has a longitudinal direction 41 and a transverse direction 42.

[0044] The device 10 shown in the figure includes two pressing members 20 and 30 according to the invention, each pressing member including 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.

[0045] 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.

[0046] 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 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.

[0047] 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.

[0048] List of reference numerals

[0049] 1 Folding machine

[0050] 2 pages

[0051] 2a Page specifications (length or portrait orientation)

[0052] 2b page specifications (width or landscape orientation)

[0053] 3 (front) page edges

[0054] 4 (on the back) page edges

[0055] 5 scales

[0056] 6 First Folding Station

[0057] 7 Output Directions

[0058] 8 Second Folding Station

[0059] 9. Supply Direction

[0060] 10 devices

[0061] 11 Conveyor tables, especially inclined roller tables

[0062] 12 Conveyor Rollers

[0063] 13 Conveying direction

[0064] 14 Stop bars for sheets

[0065] 15 components, especially the arrangement of the cue stick.

[0066] 16 components, especially the ball

[0067] 20 Press-down component

[0068] 21 Multi-section finger components

[0069] 21a Length of the finger

[0070] 22 Section 1

[0071] 22a The lower side of the first section

[0072] 23 Section 2

[0073] 23a Lower side of the second section

[0074] 23b Pivot of Section 2

[0075] 24 Section 3

[0076] 24a Lower side of the third section

[0077] 24b Pivot of Section 3

[0078] 25 guide surface

[0079] 27 Feed funnel-shaped component

[0080] 28 One (or more) feeding areas

[0081] 30 Other pressing parts

[0082] 31 Other multi-segment finger components

[0083] 31a Length of the other finger-like component

[0084] 40 Linear guiding devices, especially tracks

[0085] 41 Vertical

[0086] 42 Horizontal

[0087] 43 Sliding component

[0088] 44 Clamping elements

[0089] 50 lifting device

[0090] 51. Other linear guide devices

[0091] 52. Coupling components, especially magnetic coupling components

[0092] 53 First Magnet

[0093] 54 Second magnet

[0094] 60 Positioning elements

[0095] The length L of the 60a positioning element

[0096] 61 Other positioning elements

[0097] 61a Length of the other positioning element

[0098] 70 Section 2 (Pivoting or Linear) Motion

[0099] 71 Section 3 (Pivoting or Linear) Motion

[0100] 72. Linear motion of the pressing component

[0101] 73. Pivoting motion of the pressing component

[0102] 74. The (linear) motion of the other pressing component

[0103] 76. Linear motion of the lifting device

[0104] 77. The (linear) motion of the stop lever 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 the specifications (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 specifications (2b) of the sheet (2).

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

3. The apparatus 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 apparatus according to any one of the preceding claims, characterized in that, The multi-segment finger (21) includes a third segment (24) which is movable relative to the second segment (23), thereby allowing the length (21a) of the finger (21) to be adjusted according to the specifications (2b) of the page (2).

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

6. The apparatus 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 apparatus according to any one of the preceding claims, 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 apparatus according to claim 7, characterized in that, The pressing member (20) is pivotally arranged on the linear guide device (40).

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

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

11. The apparatus according to any one of the preceding claims, characterized in that, The device (1) 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 specifications (2b) of the sheet (2).

12. The apparatus according to any one of the preceding claims, characterized in that, The device (1) includes an arrangement of elements (15) that function to press the sheet (2) onto the conveyor table (11) from above.

13. The apparatus according to claim 12, characterized in that, The element (6) is configured as a sphere (16).

14. The apparatus according to any one of the preceding claims, characterized in that, There is a lifter (50) that is capable of positioning along the conveying direction (13) according to the specifications (2a) of the sheet (2) and in the process lifting at least one element (16) and causing the element to passively perform its function.

15. The apparatus 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 specifications (2a) of the sheet (2).

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

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

18. The apparatus according to any one of the preceding claims, characterized in that, A positioning element (60) is arranged on the pressing member (20).

19. The apparatus 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, an apparatus (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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