EP2128063A2 - Transport device for sheets and method for forming and transporting a stream of overlapping sheets - Google Patents

Abstract

The device has a conveying device (10) including a blocking unit for blocking a sheet at slipping free sheet quires. A conveying device (40) is provided at downstream of the conveying device (10) in a transporting direction of the quires. The device (40) includes a deflection unit (43) for deflecting a subsequent end of the quires. A conveying device (50) is provided at downstream of the conveying device (40) in a transporting direction of the quires. A downstream layer (H2) is formed between the devices (40, 50). The devices (10, 40, 50) are provided with conveyor belts (15, 45, 55). Independent claims are also included for the following: (1) a paper conversion machine, comprising a cross-cutter (2) a method for forming and conveying a stream of sheet quires.

Description

The invention relates to a conveyor for sheet layers with a first conveyor, which has a Verblockungseinheit for blocking the sheet to largely slip-free sheet layers, a second conveyor, which is the first conveyor in the transport direction of the sheet layers downstream and a deflection unit for deflecting the trailing end of a sheet layer , A third conveying device, which is arranged downstream of the second conveying device in the transport direction of the sheet layers, which feeds a scale flow of sheet layers such a storage area such that adhesion of the sheet layers with each other is reliably prevented. This is achieved in that a dropping step for the sheet layers is formed between the second conveying device and the third conveying device.

The invention further relates to a method for forming and conveying a scale flow from sheet layers.

In the case of corresponding generic conveyors, a continuous flow of, for example, sheets or sheet layers coming from a cross cutter is fed to a collection area, such conveyors operating at a comparatively high speed. At such high speeds, it is difficult to deposit the sheet layers in a collection area without damaging them. The speed of the sheet or sheet layers must be significantly reduced when depositing, otherwise no damage-free storage of the sheet layers is possible, this is done regularly by forming a scale flow of sheet or sheet layers. As sheet layers, which are also called paper clips or short clips, here are flat stacks of, for example, 2 to 8 sheets of paper and plastic film in particular, and composite sheets of e.g. Paper and a slide to understand. Within the wide product range of papers with particular glossy or very smooth surfaces may interfere with the removal of the sheet layers, which in addition to the adhesion even unwanted electrostatic charges and the environmental conditions of a paper processing machine - consisting essentially of a cross cutter, a stack tray and an interposed Funding - can be jointly responsible. A particular challenge in this case on the one hand to ensure sufficient adhesion of the arc of a sheet layer with each other and on the other hand the lowest possible adhesion of the sheet layers with each other. Too strong adhesion of the sheet layers with each other can not least lead to problems in the stacking area.

In the EP 1 266 854 B1 the Applicant is a proven in practice conveyor with three successively arranged conveying devices disclosed, of which the second and third conveying device have a lower conveying speed than the first. This known conveying device comprises, in the region of the first conveying device, an ionizing device by means of which the sheet layers can be electrostatically charged. In the region of the second conveying device, a suction device is arranged, by means of which the sheet layers can be acted upon with suction air in at least one region of the sheet layers. For the purpose of forming an overlap for generating a scale flow of sheet layers a step is provided between the first and the third conveyor, so that the sheet layers can overlap.

In the DE 27 25 547 A1 discloses a cross-cutter downstream device for forming a scale flow of arcuate or stapled flat objects. This known device has high-speed upper bands, which are guided together both via a feed area and via a discharge area. Furthermore, fast-running subbands are provided in the feed area and downstream, low-speed subbands in the discharge area. These slow-running subbands in the discharge area serve as brake bands and cause the formation of the scale flow. The high-speed upper belts are slightly adjustable in height with their lower runs in the discharge area by means of eccentrically mounted rollers in order to adjust the distance to the slow-running sub-bands to the height of the scale flow to be generated accordingly. Furthermore, this known device has an overlapping finger and a downstream suction box, which is adjustable in or against the transport direction. Subordinate to the suction box is also a top side arranged brake roller with an associated, arranged on the underside of the support roller. However, such a machine or such a method and such a device is less suitable for sensitive papers and for very high speeds, as this can damage the sheet or sheet layers.

In the DE 199 45 114 A1 is described a downstream of a cross-cutter device for forming a scale flow. This known device has a discharge device, Beschleunigungsober- and sub-bands and a suction box with a downstream, serving as a brake band sub-band. In adaptation to the height of the scale flow to be formed, the distance of the upper belts to the transport plane is adjustable. Furthermore, the upper and lower bands are designed to adjust the format in and against the transport direction adjustable.

Compared to this prior art, an object of the present invention is to provide a conveyor of the type mentioned, in which the sheet layers cut from multilayer webs can be conveyed at very high speed and this high conveying speed on a relatively short distance to a suitable for depositing Speed can be reduced and gently to a discard pile, which is limited by a front-mounted, fed. This should be excluded both damage to the sheet or sheet layers and excessive adhesion of the sheet layers with each other. It is also a further object of the present invention, a device of the type mentioned, starting from the in the European patent specification EP 1 266 854 B1 described conveyor to improve such that the process depending on the characteristics of the particular difficult to process paper types and formats can be adjusted easily and in a very short time accordingly.

This object is achieved according to the present invention by a conveying device for sheet layers with a first conveyor, which has a Verblockungseinheit for blocking the sheet to largely slip-free sheet layers, a second conveyor, which is arranged downstream of the first conveyor in the transport direction of the sheet layers and a deflection unit for deflecting having the trailing end of a sheet layer, a third conveying device, which is arranged downstream of the second conveyor in the transport direction of the sheet layers, which feeds a scale flow of sheet layers a storage area such that adherence of the sheet layers with each other is reliably prevented or at least significantly reduced. This is achieved by the structural measure that between the second conveyor and the third conveyor a drop level for the sheet layers is formed.

At this point, for the sake of completeness, it should firstly be pointed out that the above term blocking unit is not limited to an ionization unit, so, inter alia, a force based on adhesion is also required Unit providable by means of a pressure roller. On the other hand, it should be mentioned that from the already cited prior art, various types of deflection units are known, as there are inter alia: rotating and / or clocked overlapping fingers, air blast nozzles, spring-mounted pinch rollers, lonisiereinrichtungen and various suction devices.

A particularly preferred embodiment is given when the third conveyor device comprises a first adjusting means, which redirect their parallel arranged conveyor belts such that at least two Transporttrumabschnitte different height can be formed and thus forms a further case level, now between these Transporttrumabschnitte.

A further particularly preferred embodiment is provided when the third conveying device has second adjusting means in order to increase the transport run section adjacent to the second conveying device and to reduce the downstream carrying passage section or vice versa.

Further preferably, each first adjusting means comprises at least one deflection roller and a lifting means, wherein each lifting means is designed as a linear actuator, preferably as a pneumatic cylinder and is provided for a separate control.

Preferably, the second actuating means should have a linear drive, which comprises a reciprocable carriage. As a suitable linear drive, an embodiment is provided as a rack / gear drive, wherein the rack is fixedly mounted on a support and the gear is rotatably mounted on the carriage. Alternatively here u.a. Also a commercial timing belt linear unit providable.

Preferably, the first or the first adjusting means are mounted horizontally movable back and forth on the second actuating means.

Finally, the first, the second and the third conveying device should preferably each comprise a multiplicity of conveyor belts which are spaced parallel to the conveying direction, wherein these conveyor belts in the simplest case form a common group to which a common first actuating means is assigned. In a further embodiment, the conveyor belts are divided into at least two groups and each group is assigned a first actuating means. Preferably, however, the greatest flexibility with regard to the formation of a configurable conveyor belt group, a so-called belt carpet, is achievable if the number of first actuating means corresponds to the number of conveyor belts.

According to the invention, a paper processing machine is provided with at least one of the aforementioned conveyors. Such a paper processing machine serves, in particular, to unroll, cut and stack paper from one or more rolls at the same time, and ultimately to feed it to a further processing machine, for example, a packaging machine or a printing press.

• Verblocken der Bogen zu Bogenlagen, zum weitestgehend verrutschungsfreien Transport der Bogenlagen ,
• Transportieren der verblockten Bogenlagen in einen Überlappungsbereich, in dem in Transportrichtung aufeinanderfolgende Bogenlagen zur Überlappung gebracht werden,
• Ablenkung der zur Überlappung zu bringenden, vorlaufenden Bogenlage am in Förderrichtung hinteren Ende der vorlaufenden Bogenlage und Nachfördern der nachfolgenden Bogenlage, zur Bildung der Überlappung.
• Transportieren der zur Überlappung gebrachten Bogenlagen auf einen ersten Transporttrumabschnitt eines tiefer angeordneten nachfolgenden Abförderbands, unter Haftungsminderung zwischen den Bogenlagen.

The object is further achieved by a method for forming and conveying a scale flow from sheet layers with the following method steps:

• Blocking the bow to sheet layers, for the largely slip-free transport of the sheet layers,
• Transporting the interlocked sheet layers in an overlapping area, in which in the transport direction successive sheet layers are overlapped,
• Distraction of the overlap to be brought, leading sheet position at the rear end of the leading sheet position in the conveying direction and Nachfördern the subsequent sheet position, to form the overlap.
• Transporting the overlapped sheet layers on a first Transporttrumabschnitt a lower arranged subsequent Abförderbands, with reduction of liability between the sheet layers.

A particularly effective reduction of the adhesion between the sheet layers is achieved in that during further transport of the sheet layers from the first Transporttrumabschnitt the Abförderbands on a lower arranged subsequent second Transporttrumabschnitt the Abförderbands, with further reduction in liability.

Advantageously, the adjustment of the position of the transition point or the case level between the first Transporttrumabschnitt and the second Transporttrumabschnitt the Abförderbands in or opposite to the transport direction and / or the height difference between the first Transporttrumabschnitt and the second Transporttrumabschnitt the Abförderbands, in particular depending on the format and the Material of the bow layers.

At this point it should be noted that according to the invention in a further embodiment, of course, the transition point or the case level between the brake band of the second conveyor and the first Transporttrumabschnitt the Abförderbands the third conveyor in the position and height can be performed adjustable.

Furthermore, while maintaining the inventive concept, it is likewise possible and may possibly be useful or advantageous to assign separate discharge belts together with drives to the first and second transport run sections of the discharge conveyor belt. The advantage of such an alternative embodiment is that with simple drive means, the transport tread portion of a first discharge belt could be operated at a different conveying speed than the transport tread portion of a second discharge belt, to possibly vary the overlap length of the sheet layers.

On the other hand, the advantage of the present and below described embodiment lies, inter alia. in that it is possible with simple measures, here adjusting means to create two length and differential height variable Transporttrumabschnitte, in which the increase in length of a first section in terms of the amount equal to the length decrease of a second section, without complex compensation means for separate conveyor belts are required.

Fig. 1

eine Seitenansicht eines wesentlichen Teils einer bekannten gattungsgemäßen Fördereinrichtung in schematischer Darstellung,

Fig. 2

eine Detailansicht des Überlappungs- und Abförderbereichs einer verbesserten Ausführungsform einer gattungsgemäßen Fördereinrichtung in einem ersten Betriebszustand,

Fig. 3

eine Detailansicht des Überlappungs- und Abförderbereichs einer verbesserten Ausführungsform gemäß Fig. 2 einer gattungsgemäßen Fördereinrichtung in einem zweiten Betriebszustand,

Fig. 4

eine Ausschnittsvergrößerung des Abförderbereichs einer verbesserten Ausführungsform gemäß Fig. 2 einer gattungsgemäßen Fördereinrichtung in einem dritten Betriebszustand,

Fig. 5

eine perspektivische Ansicht von Stellmitteln im Abförderbereich gemäß Fig. 2.

The invention will be described below without limiting the general inventive concept by means of an embodiment with reference to the drawings. Show it:

Fig. 1

a side view of an essential part of a known generic conveyor in a schematic representation,

Fig. 2

a detailed view of the overlapping and Abförderbereichs an improved embodiment of a generic conveyor in a first operating state,

Fig. 3

a detailed view of the overlapping and Abförderbereichs according to an improved embodiment Fig. 2 a generic conveyor in a second operating state,

Fig. 4

an enlarged detail of Abförderbereichs an improved embodiment according to Fig. 2 a generic conveyor in a third operating state,

Fig. 5

a perspective view of adjusting means in Abförderbereich according to Fig. 2 ,

In the in the FIGS. 1 to 5 The device shown is in each case a part of a paper processing machine, not shown here in its entirety, in which a multilayer paper web is fed to a cross cutter, likewise not shown, by conveyor belts and by this cross cutter is tailored to desired arc lengths. The cut sheets are then passed through the device to a depositing, not shown, and stored there in stacks one above the other.

At this point, for the sake of completeness, it should be pointed out that merely for the sake of a simplified illustration, the belt conveyors are depicted in the figures as a single conveyor belt and are also indicated in the following description, but in each case actually a group of jointly driven conveyor belts arranged parallel to one another have, wherein such a group of conveyor belts is also referred to as a tapestry carpet. In the illustrated and described below conveyor belts are endless belts, which are driven by individual drives, not shown.

In the following figures, the functionally identical elements are provided with the same reference numerals, so that apart from a renewed presentation.

Fig. 1 shows a side view of an essential part of a known generic conveyor, which is described below in abbreviated, a complete description of the patent EP 1 266 854 B1 be removed.

The paper clips 3 are transported between an upper belt 25 and a conveyor belt 15 in the conveying direction A in the direction of a Abbremsbands 45. The upper belt 25 is deflected by means of deflection rollers 21 and by means of a drive roller or a drive unit which in Fig. 1 not shown, driven. Accordingly, the conveyor belt 15 is deflected over deflection rollers 11 and driven by a drive roller 12. The same applies to the Abbremsband 45 and the lower belt 55th

The paper clips consisting of some paper sheets, such as, for example, 2 to 8 sheets, are provided by means of an ionizer 30, which is provided with an electrical connection 31 and the electrostatic field 32 produced thereby is electrically charged, so that the paper sheets are held together in the respective paper clip 3. For focusing the electrostatic field, a counter electrode 34 is preferably provided.

The correspondingly charged paper clips 3 are then transported into the overlapping area 2, where they are in the rear area, ie their trailing end, ie in Fig. 1 in the left area, are pulled down by means of suction air 44 and are brought into the engagement region of the Abbremsbandes 45. To allow suction air 44 to attack the paper clips 3, a suction box 43 is provided in this embodiment.

In the overlapping area 2, several paper clips 3 thus overlap. These are then overlapped between the upper belt 25 and the Abförderband 55 further in the transport direction to the right (in Fig. 1 ), where it is then gently and slowly struck on a front stop, which is not shown, so that corresponding sheet stacks are generated. The speed of Abbremsbands 45 here corresponds approximately to the speed of Abförderbands 55th

Fig. 2 and 3 show a detail of a side view of an improved conveyor according to the invention with a detailed view of the overlapping and Abförderbereichs in a first ( Fig. 2 ) or in a second ( Fig. 3 ) Operating state. In these figures, in particular, the transition from the first conveying device (10) to the second conveying device (40) and further to the third conveying device (50) or more precisely the transition from the feed belt (15) on the brake band (45) and on the discharge conveyor (55) shown.

Fig. 4 shows an enlarged detail from the side view Fig. 2 , Wherein also the case stages (H2, H3) according to the invention are shown.

The in the Figures 2 and 3 The conveying device shown can first be subdivided into a feed area and a discharge area adjoining the feed area downstream of the feed area, wherein the transport in the present embodiment, in the FIGS. 2 to 5 not shown sheet layers (3) in the direction of the arrow A shown in the figures, ie according to the FIGS. 2 to 4 from left to right, takes place. The discharge region shown can in turn be subdivided into three sections (I, II, III), namely into a braking and overlapping area I, into a first transporting section II adjoining the overlapping area and a second transporting section III of the discharge conveyor belt (55) further downstream third conveyor (50).

The device has a feed conveyor 15 which is deflected at its end adjacent to the Abbrems- and overlap region I by a guide roller 11. The Abbrems- and overlap region I has a Abbremsband 45, which is deflected at the beginning of its upper run adjacent to the feed area via a pulley, not shown in the transport direction A and immediately above the suction box to the subsequent guide roller 41. As the Figures 2 and 3 can be seen, the upper run of the Abbremsbands 45 is lower by a height H1 than the upper run of the feed conveyor 15, thereby the necessary for an overlap and usual stage is formed in the transport plane.

The Abförderbereich has a discharge conveyor 55 which is guided around stationary guide rollers 51. According to the invention, the upper run of the delivery belt is deeper than the upper run of the Abbremsbands 45 by a height H2, thereby the leading edges of the clips are slightly fanned out when passing this step-shaped transition point, so that the adhesion between the clips with each other by, for example. Bend and / or air entry is reduced.

Furthermore, according to the invention in the upper run of Abförderbands 55 horizontally and / or vertically movable guide rollers 56, 57, 58 are provided which in operative connection with a first actuating means 53 and a second actuating means 60th stand. The latter adjusting means 60 causes the horizontal adjustment of the guide rollers 56, 57, 58, whereby the discharge area is divided into two variable transport Trumabschnitte II and III. This adjusting means 60 comprises a linear drive, which is designed as a rack / gear drive 61, 62, a movable carriage 64, the rack 61 is fixedly mounted on a support 63 and that in the rack 61 meshing gear 62 by means of a motor, not shown a carriage 64 moves horizontally. The carriage 64 finally carries the bearing of the movable guide rollers 56, 57, 58, so that they can take the required and format-dependent position according to a minimum section length L1 of eg 500 mm or a section length L1 'of eg 1000 mm.

The adjusting means 53 causes by means of a lifting means 54, the vertical adjustment of the guide rollers 58, whereby the downstream Transporttrumabschnitt III of Abförderbereichs can be spent to form a step in different heights H3.

In the Figures 2 and 3 is the lifting means 54 together with deflection roller 58 and support plate 59 dargstellt in an uppermost position, thus in this operating state, the height of the stage H3 = 0. In this uppermost position, the stationary pulleys 51 and the upper movable rollers 56, 58 are at a height so that the transport strand with the sections II, (L2, L2 ') and III extends horizontally in a plane from the upstream to the downstream guide roller 51.

In the FIGS. 4 is the lifting means 54 together with pulley 58 and support plate 59 dargstellt in a lowermost position, thus the maximum height of the stage is given in this mode, the height H3 can then, for example, 25 mm. In this lowermost position, the stationary pulleys 51 and the upper movable pulley 56 are still at a height, while the upper movable pulley 58 is deeper by an amount H3 = 25, so that the transporting pulley with the sections III slightly rises from the movable pulley 58 to the downstream pulley 51 extends. This low slope has a favorable effect on the transport behavior of the clips in the case of special types of paper, in particular during the transition to a subsequent horizontally arranged stack of stock, not shown. Another advantage is that the transfer point of the sheet layers in the storage area maintains a constant height.

In order to take into account the different types of paper and in particular different grammages and / or different surface roughnesses, it is provided to provide the number of setting means 53 corresponding to the number of conveyor belts 55 of the belt carpet. The lifting means are designed separately switchable, so that - adapted to the paper type and / or paper sizes - appropriate groups of engaging conveyor belts 55 can be formed. Preferably, the stroke H3 of the lifting means 54 is made adjustable. As a suitable lifting means are preferably pneumatic cylinders, which have an adjustable end position damping provided. There are also suitable as lifting means and alternative electromechanical actuators, such as solenoids, electric cylinders and other linear actuators into consideration, which may also have a continuous stroke adjustment. The formation of a variable height stage H3 according to the invention results in the downstream transport strand section III of the discharge belt 55 rising at a shallow angle between the adjustable deflection roller 58 and the downstream stationary deflection roller 51, which extend into the FIGS. 2 to 5 not shown. If such an increase is not desired, a vertical adjustment of the previously stationary roller 51 would have to be provided, wherein the height to be set would follow the height H3.

In Fig. 5 In essence, the adjusting means 53 is shown in perspective in detail. On a support that extends over the entire working width of the conveyor 50, a plurality of lifting means 54 together with pulleys 57 and 58 and the support plates 59 are arranged side by side transversely to the transport direction. As an example, one of the discharge belts 55 is also shown.

The following exemplary embodiment should be named for the method of operation for bringing together and conveying sheet layers or paper clips: First, a paper clip 3 is charged by means of the ionizer 30 so that the paper clips or the sheets are held together in the paper clip. Upon further transporting the loaded paper clips in an overlap region 2, the paper clips 3 are brought to overlap, wherein in the rear region of the paper clip 3 just transported in the overlap region suction air is applied. This happens because in the moment where the rear portion of the clip 3 enters the overlap region, the corresponding suction holes of the Abbremsbänder 45 are brought into the effective range of the suction box 43.

On the further transport path, the paper clips 3 are transferred from the second (braking) conveying device 40 to the third (lowering) conveying device 50; in this case, the clips 3 pass through a first drop step H2 according to the invention, whereby the clips are loosened slightly, or in other words one Liability reduction is brought about by, for example. Bending and / or air entry between the clips 3 before they reach the Transporttrumabschnitt II, L2, L2 'of Abförderbands 55.

Subsequently, the paper clips 3 from the Transporttrumabschnitt II, L2, L2 'transferred to the downstream subsequent Transporttrumabschnitt III of the Abförderbands 55, in this case pass through the clips 3 a second case according to the invention H3, whereby in case of need, i. with appropriate control of the lifting means 54, a further reduction in liability is brought about by, for example. Bending and / or air entry between the clips 3 before they reach the Transporttrumabschnitt III of Abförderbands 55.

In the further course of conveying the paper clips 3, these are gently pushed together on a stacking platform and / or pallet on a stacker, not shown in the figures, in the storage area to form paper stacks.

LIST OF REFERENCE NUMBERS

1

Conveyor

2

overlap area

3

Sheet, Pabier clip, clip

10

first conveyor

11

idler pulley

12

capstan

15

conveyor belt

20

upper conveyor

21

idler pulley

25

top belt

30

ionizer

31

electrical connection

32

electrostatic field

40

second conveyor

41

idler pulley

42

capstan

43

suction box

44

suction

45

Abbremsband

50

third conveyor

51

idler pulley

52

capstan

53

first actuating means

54

lifting means

55

discharge belt

56

idler pulley

57

idler pulley

58

idler pulley

59

support plate

60

second actuating means

61

rack

62

gear

63

carrier

64

carriage

Claims (15)

Conveying device for sheet layers (3) with a first conveying device (10), which has a Verblockungseinheit (30, 31) for blocking the sheet to largely slip-free sheet layers (3), a second conveyor (40), which of the first conveyor (10) in Transport direction of the sheet layers (3) is arranged downstream and a deflection unit (43) for deflecting the trailing end of a sheet layer (3), a third conveyor (50) which is the second conveyor (40) downstream in the transport direction of the sheet layers (3), characterized in that
between the second conveying device (40) and the third conveying device (50) a dropping step (H2) is formed. Conveying device according to claim 1, characterized in that the first, the second and the third conveying device (10, 40, 50), each having a plurality of parallel spaced conveyor belts (15, 45, 55). Conveying device according to claim 2, characterized in that the third conveying device (50) first actuating means (53) which deflect their conveyor belts (55) such that at least two Transporttrumabschnitte (II, III) can form different height and thus a drop level (H3) between the Transporttrumabschnitte (II, III) forms. Conveying device according to claim 3, characterized in that the third conveying device (50) has second adjusting means (60) for enlarging the conveying strand section (II, L2, L2 ') adjacent to the second conveying device and for reducing or reducing the downstream subsequent conveying strand section (III) . vice versa. Conveying device according to claim 3, characterized in that the conveyor belts (55) are divided into at least two groups and each group is associated with a first adjusting means (53). Conveying device according to claim 3, characterized in that the number of the first adjusting means (53) corresponds to the number of conveyor belts (55). Conveying device according to one or more of claims 1 to 6, characterized in that first adjusting means (53) is movably mounted on the second adjusting means (60). Conveying device according to one or more of claims 1 to 7, characterized in that the first adjusting means (53) each comprise at least one deflection roller (58) and a lifting means (54). Conveying device according to claim 8, characterized in that each lifting means (54) is designed as a linear actuator, preferably as a pneumatic cylinder and is provided for a separate control. Conveying device according to claim 4, characterized in that the second adjusting means (60) with a linear drive (61, 62) is formed and comprises a reciprocable carriage (64). Conveying device according to claim 10, characterized in that the linear drive (61, 62) as a rack / gear drive (61, 62) is formed, wherein the rack (61) is fixedly mounted on a support (63) and the gear (62) is rotatably mounted on the carriage (64). Paper processing machine with a cross cutter and a storage area and at least one conveyor device according to one or more of claims 1 to 11. Method for forming and conveying a scale flow from sheet layers (3) with the following method steps: - Blocking the sheet to sheet layers (3), for the most spill-free transport of the sheet layers (3), - Transporting the interlocked sheet layers (3) in an overlapping area (2), are brought in the transport direction successive sheet layers (3) to overlap, - Deflection of the overlap to be brought, leading sheet layer (3) at the rear end in the conveying direction of the leading sheet layer (3) and Nachfördern the subsequent sheet layer (3), to form the overlap. - Transporting the overlapped sheet layers (3) on a first Transporttrumabschnitt (II) of a lower arranged subsequent Abförderbands (55), with reduction in adhesion between the sheet layers (3). A method according to claim 13, characterized in that further transport of the sheet layers (3) from the first Transporttrumabschnitt (II) of the Abförderbands (55) on a lower arranged subsequent second Transporttrumabschnitt (III) of the Abförderbands (55), with further reduction in adhesion between the sheet layers (3 ). A method according to claim 14, characterized in that the position of the transition point between the first Transporttrumabschnitt (II) and the second Transporttrumabschnitt (III) of the Abförderbands (55) is set in the transport direction and / or the height difference (H3) between the first Transporttrumabschnitt (II) and the second Transporttrumabschnitt (III) of the discharge belt (55) is set, in particular depending on the format and the material of the sheet layers (3).

Images