EP2605988A1

EP2605988A1 - Drive mechanism for a device for laying a fibrous material web in a leporello fold

Info

Publication number: EP2605988A1
Application number: EP11735392.0A
Authority: EP
Inventors: Andreas Sprick-Schuette
Original assignee: Sprick Bielefelder Papier und Wellpappenwerke and Co GmbH
Current assignee: Sprick Bielefelder Papier und Wellpappenwerke and Co GmbH
Priority date: 2010-08-19
Filing date: 2011-07-20
Publication date: 2013-06-26
Anticipated expiration: 2031-07-20
Also published as: WO2012022412A1; PL2605988T3; EP2605988B1; DK2605988T3; HUE054127T2; DE102011011659A1; ES2861098T3

Abstract

The invention relates to a drive mechanism (1) for a device for laying, in particular an unfolded fibrous material web, in particular a paper web or a corrugated material web, such as a corrugated cardboard web, in a Leporello fold (3), comprising a pair of opposing rollers (5, 7) which are pivotably mounted and which form a passage gap (13) for the fibrous material web and which can be rotated in particular for conveying said fibrous material web through the passage gap, and a drive for pivoting the roller pairs. When pivoted, an outlet dispensing direction defined by the passage gap swings back and forth preferably vertically (V) such that a device (17) swinging back and forth for guiding the fibrous material web to the Leporello fold is arranged downstream of the conveyance stream flow to the passage gap.

Description

Drive mechanism for a device for laying a fibrous material web

fanfold

The invention relates to a drive or folding mechanism for a device for laying a particular unfolded fiber material web, in particular a paper web, a corrugated paper web or a corrugated cardboard web, in a Leporellofaltung.

A wave train is often used for packaging purposes, for example, by laying apart corrugated cardboard layers for cushioning adjacent goods to be laid. A corrugated cardboard cut can be contoured on one or two sides. In a corrugated web contoured on one side, one side is formed by a corrugated paper layer onto which a smooth paper layer is glued to form the other side. It should be understood that the corrugated web may also be formed by a plurality of superimposed flat and / or corrugated paper layers to increase the buffering property of the packaging material.

For packaging, it is common practice to strip the packaging material from a source of packaging material, which may be either a wound roll or a fanfold stack. The cuboid Leporellofaltstapel has over the cylindrical Aufwickelrolle the advantage of a space-saving storage, because on the one hand a higher material density is achieved due to the Leporellofaltung that the respective wave-valley form of opposing folding layers can interlock, and on the other hand, the cuboid Leporellofaltstapel simple and raumausfüllend and can be stacked next to each other. Also, when pulling or unfolding the fiber material web of the wound roll or from the Leporellofaltstapel the Leporellofaltung has the advantage that the unfolding Leporellofaltung stationary and not, as opposed to the role, during the development durchfuhrt a rotary motion, which requires special storage properties and a Hüttenraumbedarf , In the manufacture of the fibrous material web, it is customary that these are provided on rolls at the end of the production process, so that the creation of a Leporello folding stack would first have to be unwound from the rolls and then brought to the Leporello fold. A device for laying a particular unfolded, endless fibrous material web in a Leporellofaltung is known from DE 196 44 383 Cl. The Leporellofaltvorrichtung has formed a drive mechanism in the form of a translationally reciprocable conveyor belt pair with two vertically arranged drive belt. In order to achieve the fan-shaped zigzag folding, the vertically oriented drive belts are moved back and forth in the horizontal direction translationally.

From DE 35 00 766 AI also a drive mechanism for a Leporellofaltrichtung is known in which a pair of pendulum rod upstream drive roller subtracts a radial web from a material web source and the pendulum rod pair feeds, which is to form the Leporellofalte by a back and forth pivoting movement.

DE 196 64 858 discloses a drive mechanism for a Leporellofaltung in which a draw roller peels off the web. The draw roller is fixedly mounted on the support frame of the device of the Leporellofaltvorrichtung. About a swivel arm with two guide pins, the Leporellofaltung is performed.

All the above-described drive mechanisms for a Leporellofaltung have the common disadvantage of a considerable space required to realize the drive mechanism by drive belt or a combination of a drive roller and a pivoting mechanism. In addition, in the known drive mechanisms, a high component material costs, as well as wear to complain and a large number of components is required.

It has also been shown that the drive mechanisms are not designed to realize higher conveying speeds of up to 30 or 40 meters per minute without sacrificing the quality of folding of the fanfold.

It is an object to overcome the disadvantages of the prior art, in particular to provide a drive mechanism for a Leporellofaltvorrichtung and a Leporellofaltvorrichtung, with the simplest possible structure low space requirements as clean as possible Leporellofaltung for the fiber material at conveyor speeds of about 30 m / min.

This object is solved by the features of claim 1. Thereafter, a drive mechanism for the device for laying a particular unfolded fiber material web, in particular a paper web and a corrugated paper web, such as a corrugated cardboard web, provided in a Leporellofaltung. The drive mechanism comprises a pivotally mounted pair of opposing rollers which form a passage gap for the material fiber material web and in particular for conveying the fiber material web through the passage gap are rotatable. It is this pair of rollers, which should oscillate back and forth by a drive for pivoting the pair of rollers.

The passage gap defines an exit discharge direction of the fiber material web in the conveying direction away from the passage gap, which can be defined in particular by mutually parallel tangents at the smallest passage of the passage gap. During pivoting of the roller pair, the outlet discharge direction for the fiber material web defined by the passage preferably oscillates back and forth about a vertical. In this case, it can pass through a pendulum means passage position in the vertical while pendulum outer reversal positions laterally limit the pendulum amplitude of the roller pair, in particular the outlet output direction. According to the invention, downstream of the passage gap, a device which oscillates back and forth with the pair of rollers is arranged downstream of the passage for guiding the fiber material web toward the fan-fold unit. The guide is to be able to oscillate with the pair of rollers back and forth firmly attached to this.

It has been found that with the measure according to the invention of providing a leading guide for the fibrous material web in the forderflussgerichteten connection to the passage gap a precise Leporellofaltung always always the same place can be ensured easily and controlled, which leads to the conveying speed of the fiber material web through the drive mechanism through increase. Surprisingly, it has also been found that bulging of the fibrous material web is avoided in the formation of the uppermost Leporellofaltung because of the arrangement of the leading guide, whereby the next Leporellofaltung can be realized accurately position. By the guide the fiber material web is always set from one fold to the next under tension, whereby a buckling between two folds is avoided. Without the guide device according to the invention, disadvantages may arise in the horizontal positioning of the folding of the Leporello which is to be formed in each case owing to possibly inhomogeneity of the material web. It turned out that in particular also due to the forces directed towards the middle of the Leporello folding, like the Irregular early wrinkling results in an uneven stack shape and a surplus of material in the formation of the subsequent layer, such that the follower fold is made "too late" and the fold over edge protrudes from the Leporello folding pile. The guide device according to the invention is designed to minimize the forces to be applied to the material web for guiding and guiding following the passage gap, but to ensure a controlled precise, horizontal positioning of each folding of the fanfold folding stack. The baffle mainly exerts guide pressure forces against the forces acting horizontally toward the center of the Leporello folder, thus preventing the card from folding.

In a preferred embodiment of the invention, the guide device has a driver, in particular two opposite drive plates or rods arranged in particular parallel to one another. The driver limits a receptacle for a fiber material web leaving the passage gap in both pendulum directions, so that the fiber material web is entrained in the respective pendulum direction when passing through the receptacle. In this way, the desired tensile stress of the fiber material web is communicated when the fiber material web is pulled slightly from the last folding performed to the opposite side.

If the driver be designed as a Mitnehmerstange, can be quite a space between the pair of rollers and the Mitnehmerstange. It is not necessary to provide a full-surface guide between the passage gap and the driving rod continuously. In an alternative embodiment of the driver, plates arranged parallel to one another can be provided, which provide a continuous guidance from a passage gap to the discharge end of the driver plate.

In a preferred embodiment of the invention, the driver is designed to keep the free discharge end in the reciprocating motion substantially on a horizontal and / or in a horizontal plane. Alternatively or additionally, a length of the driver in the outlet discharge direction is preferably continuously adjustable, in particular during the reciprocating movement, so that preferably a free end of the carrier during the reciprocating movement extends substantially on a horizontal or in a horizontal plane. Alternatively or additionally, the driver can do so be designed, a vertical distance of a free end of the driver remains substantially constant to the last formed fold position of the Leporellofaltung. It was found that with the adjustment of the length or the distance of the delivery end of the driver towards the passage gap and / or the Leporellofaltung a significantly increased conveying speed for the fiber material web is possible to precisely set the Leporellofaltung.

In a preferred embodiment of the invention, the drive mechanism has a distance adjustment, in particular regulation, which adjusts or regulates a distance in exit discharge direction between the guide, in particular the driver, and the passage gap preferably in dependence on a pivot position of the exit direction and / or a conveying speed of the fiber material web Preferably, such that the distance is maximized at the pendulum outer reversal position and / or is minimized at a pendulum means passage position.

In a development of the invention, the guide device has a preferably extending in the exit direction guide shaft, in particular in extension of the passage gap and / or constant width. In this case, the length of the guide shaft in the outlet discharge direction can preferably be adjustable from the passage gap to a free end of the guide device. The length to be set may depend on the pendulum position and / or a conveying speed of the fiber material web. At the side of the guide shaft adjacent to the passage gap, a scraper can be firmly attached in order to lift the fiber material web, in particular a leading edge end of the fiber material web, as gently as possible from the drive roller and thread it into the guide shaft. In this case, the scraper can rest against the roller pair.

In a further development of the invention, the guide device comprises a telescopic mechanism with a stationary part connected to the pair of rollers base part and a particular in exit discharge direction with respect to the base part back and forth movable Verfahrteil. The traversing part may have a smaller dimension in order to be able to enter the base part with the correspondingly larger internal dimensioning. It is clear that the Verfahrteil can be designed to accommodate the base part movable in itself.

An extension and retraction movement of the Verfahrteils with respect to the base member may be determined by means of a preferably arcuate scenery, which is stationary, in particular firmly a support frame of the device can be attached. Alternatively or additionally, a sliding block fixedly mounted on the displacement part can engage in the slot, so that in particular in both pendulum reversal positions, the extension part is brought into the furthest extended position. Alternatively, and additionally, the extension member may be brought into the shuttle center passage position in the furthest retracted position of the travel member relative to the base member.

In a preferred embodiment of the invention is at one end of the guide, which may be formed of a rigid material, in particular at one end of the extension, a flexible device, in particular a broom with substantially parallel to the exit direction extending bristles for smoothing a zuoberst laid position arranged the Leporellofaltung. Preferably, the broom in the transverse direction of the fiber material web may have a comb shape with projecting barbs each having a plurality of broom bristles, wherein the brooms are separated by substantially equal intervals.

Additionally or independently of the drive mechanism of the invention described above, the invention also relates to a drive mechanism for a Leporellofaltvomchtung comprising the pivotally mounted pair of opposing rollers which form the passage gap for the fiber material web and in particular are rotatable when conveying the fiber material web through the passage gap. Furthermore, the drive mechanism according to the invention has a pivot drive, by means of which the pair of rollers is pivotable, so that a discharge discharge direction defined by the passage gap preferably oscillates back and forth about a vertical. The pivoting drive may preferably be realized by a connecting rod drive, wherein in general a continuous rotational movement, in particular of a drive transmission part, such as a drive pulley, is converted into a pivoting movement, preferably of the roller pair. The connecting rod drive has a drive pulley, to which a connecting rod is articulated, which in turn is coupled to a driven only a pivoting drive pulley, which can oscillate the roller pair. The connecting rod drive has a kinematic dead center, in particular in the case of the two pivot outer reversal positions, in which the pivoting angular speed of the driven pulley is negligibly small. According to this subject invention, the pivot drive is coupled with a device for adjusting, in particular rules, the drive angular velocity, in particular the drive pulley operatively. The adjustment means is adapted to adjust the drive angular velocity in response to a pivotal position of the exit discharge direction. In this case, the setting can be determined such that in the area of the pendulum outer reversal position, in particular on reaching the pendulum outer reversal position and / or leaving the pendulum reversal position, a higher drive angular velocity of the drive pulley, preferably the highest pendulum drive angular velocity with respect to the total reciprocating motion is set. Alternatively or additionally, in the region of the pendulum means passage position, in particular when passing through the pendulum means passage position, a lower pendulum drive angular velocity, in particular the lowest drive angular velocity of the drive pulleys with respect to the total reciprocating movement of the discharge discharge direction, can be set. Increasing the drive angular velocity of the drive sprockets at the pendulum outboard reversal positions ensures that persistence in the pendulum outboard reversal position is shortened while reducing the drive angular velocity of the drive sprockets as they pass through the shuttle center position is accompanied by a reduction in pendulum speed. In this way, a uniform material balance can be achieved along the entire reciprocating path.

In a further independent and combinable invention aspect, the drive mechanism according to the invention for a Leporellofaltvorrichtung has a pivotally mounted pair of rollers which form the passage gap for the fiber material web, and in particular in conveying the fiber material web through the passage gap are rotatable. In addition, the drive mechanism has a roller drive which rotatably drives at least one of the two rollers for conveying the fiber material web through the passage gap toward the fanfold. Furthermore, the drive mechanism has a pivot drive, by means of which the roller pair can be pivoted in such a way that an exit discharge direction defined by the passage gap preferably oscillates back and forth about a vertical. According to the invention, the roller drive, which communicates rotational forces to at least one roller about its axis of rotation in order to drive the fibrous material web, is operatively coupled to a control and / or regulation of an angular speed of the at least one driven roller. The control or regulation is designed to adjust the angular velocity as a function of a pivot position of the exit direction. In this case, the setting of the angular velocity in such a way be designed that the angular velocity of the driven roller in the range of a pendulum outer reversal position of the exit discharge direction, in particular on arrival at the pendulum outer reversal position and / or on leaving it is set smaller, especially lowest with respect to the total reciprocating motion. Alternatively or additionally, the angular speed of the driven roller in the region of the pendulum means passage position of the outlet discharge direction may be greater, in particular largest, with respect to the total reciprocating movement.

Finally, the invention relates to a Leporellofaltvorrichtung with a tray on which a set for Leporellofaltung fiber material web stack is folded away in particular for its further transport away from the device. Furthermore, the Leporellofaltvorrichtung has a Leporellofaltmechanismus that brings the fibrous material web in a Leporellofaltung and in particular one of the above-mentioned subject matter relating to the drive mechanism may have. The Leporellofaltvorrichtung invention has a means for depressing the Leporellofaltung particular adjacent their respective end Abschlussfaltrand, wherein the depressing device in particular in the vertical direction between a Druckeingriffsposition in which the depressing the Leporellofaltung depressing wrinkles, and a release position is movable, in which the depressing the Leporellofaltung releases. Furthermore, the Leporellofaltvorrichtung invention has a retaining device, which prevents the Leporellofaltung because of their elastic restoring forces at least partially to a deployment when the depressing device is in the release position or there.

In a preferred embodiment of the invention, the RückJialteinrichtung is in particular substantially in the horizontal direction between an active position, in the retaining device prevents the Leporellofaltung at a deployment and a passive position in which the retainer releases the Leporellofaltung.

In a further development of the invention, the depressing device and the retaining device are structurally matched to one another in such a way that they engage the Leporello folding in the width direction of the Leporello folding essentially at the same point adjacent to the respective fold. Preferably, the depressing device has a comb structure, which is formed in particular by a preferably regular sequence of coming into pressure contact with the Leporellofaltung, in particular blunt pressure tines and clearances between the pressure tines. The retaining device has a comb structure, which is preferably formed by a particularly regular sequence of the particular with the Leporellofaltung in retaining contact coming, in particular blunt retaining tines and recesses between the retaining tines. The retaining prongs may each have a horizontal extension for forming a retaining contact surface, which preferably extends substantially parallel to the position of the Leporellofaltung, in particular the top suppressed position of the Leporellofaltung, and / or at least in the active position substantially horizontally.

Preferably, the comb structure and the comb structure of the depressing device or the retaining device may be configured such that can interlock, in particular the retaining tines in the free spaces and retract, especially when the retainer or the pressing device in the active position or in the pressure-engaging position are. In this case, the extension may be dimensioned such that it protrudes laterally in the active position in the width direction of the Leporellofaltung on the respective fold.

In a preferred embodiment of the invention, the depressing device has an axisymmetric arrangement in the width direction, in particular to the central axis of the Leporellofaltung of a left and a right Niederdrückstempel in particular for alternately depressing the Leporellofaltung. Alternatively or additionally, the retaining device has an axisymmetric arrangement, in particular to a central axis of the Leporello fold in the width direction, of a left and right retaining arm or foot, in particular for alternately obstructing the Leporello fold at the deployment.

In a preferred embodiment of the invention, travel kinematics, in particular the gear and / or linkage systems, the retaining device and the depressing device are coordinated, in particular synchronized, that a respective left or right Niederdrückstempel go to the release position when a respective left or right retaining arm, the active Position taken. Alternatively or additionally, a respective left or right retention arm moves to the active position, if a respective left or right Niederdrückstempel still in the Print engagement position is. Alternatively or additionally, at least one of the four, left and right, retention arms and depression punches in the active position and pressure engagement position, respectively, at the time of the lapping of the leaflet.

Furthermore, the invention relates to a particular embodiment of at least one of the two rollers of the roller pair, which is driven to realize the conveyance through the passage gap. At least one of the rollers has in its entirety an array of parallel grooves which are preferably shaped according to the corrugation of the fibrous material web. The grooves extending parallel and in the longitudinal direction of the roller essentially have a sequence of identical groove dimensions. The groove arrangement is divided into several equal sections, the sections being interrupted by a depression. These recesses or recess runs completely around the roller and in particular has a substantially constant width in the circumferential direction. In the circumferential recesses, which can be arranged at equidistant intervals, a scraper can constantly intervene. The scraper serves to lift the fibrous material web on leaving the passage gap of the drive roller, so that the fiber material web can reach as resistance as possible, in particular in the guide.

The drive mechanism, which may also be referred to as a folding mechanism for a device for laying a particularly unfolded fibrous material web, in particular a paper web or a corrugated paper web, such as a corrugated fiberboard web, in a fanfold configuration, comprises at least the pair of opposing rolls. The rollers each define an axis of rotation, which axes of rotation do not coincide. The rollers rotate about their own axis of rotation, in particular during passage of the fiber material web through the passage gap.

A rotary axis roller drive at least one of the two rollers for conveying the fiber material web through the passage gap formed by the rollers through to the Leporellostapelung, and a pivot drive has in particular a not coincident with the axes of rotation pendulum axis. The at least two rollers are mounted so pivotally that they are pivoted back and forth on actuation by the pivot drive, the axes of rotation of the rollers about the common pendulum axis. It is possible to significantly reduce the dimension, in particular of the drive mechanism and thus of the entire Leporellofaltvorrichtung, especially in the vertical direction regardless of the desired width of the Leporellofaltung to be laid. In addition, it was found that only a single pair of rollers with at least one driven roller is sufficient to realize a Leporellofaltstapel. Due to the significant reduction of the dimension especially in the height direction, the movement amplitudes of the components of the drive mechanism are significantly reduced. Taking into account that corrugated board webs usually have a width of at least 1000 mm, it was found that less air turbulence due to the reduced movement amplitudes are generated by the measure according to the invention and the concomitant reduction in height, whereby the air resistance is reduced and thus to drive the Drive mechanism necessary energy. In addition, it was found that the fibrous material web, in particular in the case of paper webs, is less severely impaired due to the less present air turbulences, the fibrous material web, whereby a more precise Leporellofaltung is possible. In addition, the production speed can be increased when Leporellofalten.

In a preferred embodiment of the invention, the pendulum axis is substantially parallel to the axes of rotation, which allows a simple structural design. Preferably, the pendulum axis is arranged in the region of the passage gap, whereby the height and the dimension of the drive mechanism and the Leporellofaltvorrichtung can be minimized.

In a further development of the invention, the center distances between the pendulum axis and the axes of rotation of the rollers and / or a width of the passage gap remain constant during an entire reciprocating movement of the roller pair. In this way, a precise Leporellofaltung can be achieved.

In a preferred embodiment of the invention, connecting lines between the pendulum axis and the respective axes of rotation define an acute or obtuse angle which is greater than 25 °, 30 °, 45 ° or 60 °, preferably approximately equal to 180 °. In this way, it is taught to arrange the pendulum axis as close as possible to the pair of rollers in order to keep the pivoting amplitudes of components of the drive mechanism as small as possible. In a further development of the invention, the pendulum axis extends transversely to a longitudinal direction or a conveying direction of the fiber material web, in particular perpendicular thereto, through the passage gap.

In a further development of the invention, the pendulum axis extends between the rollers over. Preferably, the pendulum axis extends through the passage gap at substantially equidistant, shortest distances to the at least two rollers. The pendulum axis may be arranged in the region of the fiber material web, in particular parallel thereto, preferably in a plane which is defined by the fiber material web in the region of the passage gap, in particular in the passage gap.

In a further development of the invention, the passage gap defines a delivery direction for the fiber material web leaving the passage gap. The dispensing direction can, with respect to a vertical direction, which corresponds in particular to the gravitational direction and perpendicular to the horizontal direction, when pivoting the at least two rollers a pivot angle sector of at most 180 ° and at least 20 °, preferably between 60 ° and 140 °, go through. The pivoting angle sector thus comprises two maximum angular positions, which can be at most 90 ° and at least 10 ° with respect to the vertical direction. Preferably, the discharge direction is pivoted by 45 ° to 75 ° relative to the vertical direction on both sides.

Preferably, the swivel angle sector is symmetrical to the vertical direction on which the pendulum axis is arranged. The Schwerikwinkelsektor can be adjusted depending on a distance of the passage gap for storage, in particular to an uppermost leaflet of the already laid fiber material web stack, and depending on a width of the Leporellofaltung.

In a preferred embodiment of the invention, the rotary axis roller drive and the pivot drive are coordinated such that when laying the fiber material web in the Leporellofaltung a defined by the passage gap discharge direction for the fiber material web towards a folding end of the fiber material web stack has to form at the next Leporellofalte the Leporellofaltung is. In this case, the dispensing direction by parallel tangential directions opposite each other in the shortest distance Be defined circumferential points of the rollers, in particular, the circumferential locations are determined in particular by contact points of the fiber material web on the rollers.

In a preferred embodiment of the invention, the drive mechanism without further roller, without any further mechanical engagement on the fiber material web, formed between the at least two rollers and the last-laid Leporellofalte the Leporellofaltung. It can be provided to provide only a single drive roller for advancing the fiber material web.

In a preferred embodiment of the invention, the pendulum axis is in particular arranged or mounted stationary relative to the support frame of the device or the drive mechanism.

In a preferred embodiment of the invention, the pivot drive has a driven pulley whose axis of rotation preferably coincides with the pendulum axis P. In this case, the pivot drive may have a drive pulley, which in particular be coupled via a power transmission means, such as a toothed belt, with the driven pulley. A connecting rod is articulated via an eccentric to a rotational axis of the drive pulley Abtriebsanlenkstelle and articulated via an axis of rotation of the drive shaft eccentric Antriebsanlenkstelle on the drive shaft. Center axis distances of the articulation points are determined such that in a continuous drive rotation of the drive shaft only in one direction of rotation a Pendelschenkbewegung is performed by the drive pulley. Preferably, the center-to-center distance of the output armature point is greater than the center-to-center distance of the drive armature point.

Preferably, the center distance of the Abtriebsanlenkstelle on the drive pulley is adjustable, in particular provided several Abtriebsanlenkstellen particular in the form of holes for receiving coupling pins of the connecting rod to the drive pulley.

In a preferred embodiment of the invention, the rollers between fixed operating positions are mutually adjustable and detectable in the operating positions, wherein an operating position set a large distance for threading the fiber material web between the at least two rollers and an operating position a small gap forming the passage gap. In a preferred embodiment of the invention, a feed of the fiber material web in the longitudinal direction thereof is realized exclusively via the rotary axis rolling drive, in particular via only one driven roller of the roller pair.

In a preferred embodiment of the invention, the rotary axis roller drive has two independently controllable rotary motors, one of which in each case drives one roller of the roller pair.

Preferably, the rotary axis roller drive has a servomotor, in particular for each roller.

In a development of the invention, the driven roller, in particular only the driven roller, is in an essentially positive engagement with the fiber material web, in particular with a surface contour of the fibrous material web.

In a preferred embodiment of the invention, a roller of the roller pair is designed to press the driven roller in a form-locking engagement with a surface contour of the fiber material web, in particular substantially without conveying the fibrous material conveying drive forces in the conveying direction.

In a preferred embodiment of the invention, the driven roller, in particular only the driven roller, an outer contour, in particular a wave-shaped outer corrugation, which is in particular adapted to a preferably wavy surface contour of the fiber material web such that contour mountains, in particular wave crests, and contour valleys, in particular troughs, the fibrous material web substantially complementary to shape with contour valleys, in particular troughs, and contour mountains, in particular crests, the outer contour of the driven roller come into engagement.

In a preferred embodiment of the invention, one of the rollers is designed with a substantially smooth surface, which is embodied in particular with respect to the fiber material web with low friction, preferably by uncoated aluminum.

In a further development of the invention, the drive mechanism is provided with a control and / or regulating device which synchronizes the pivot drive and the rotation axis roller drive. Furthermore, the invention relates to a method and a device for laying a particular unfolded fiber material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web, in a Leporellofaltung. In this case, the fiber material web is separated from a set for Leporellofaltung fiber material web stack, in particular cut off by a horizontally mounted support plate is retracted from a passive rest position adjacent to the fiber material web stack between an upper and a lower leaflet of Fasermaterialbahnstapels, so that the fiber material web in the region of a folding edge between the upper and the lower leaflet is cut and the folded from the fiber material web stack folded sheet is placed on the support plate.

With the measures according to the invention it is possible to realize a precise Leporellofaltung always lying one above the other, so lying in a vertical plane Leporellofalten and thereby reach speeds of up to 30 m / min. It was found even in the inventive embodiment of the invention that conveyor speeds up to 50 or even 60m / min can be achieved without having to accept losses in Leporellofaltqualität.

Further characteristics, advantages and features of the invention will become apparent from the following description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:

Figure 1 perspective side view of an inventive

Drive mechanism for a Leporellofaltvorrichtung;

Figure 2 is a side view of the drive mechanism of Figure 2;

Figure 3 is a plan view of the drive mechanism of Figure 1;

Figure 4 is a cross-sectional view of the drive mechanism according to the invention in the shuttle center passage position taken along section line IV-IV;

Figure 5 is a cross-sectional view of the drive mechanism of Figure 4 in the right pendulum turn-up position; Figures 6a - 6d, the entire drive mechanism in four different pendulum positions;

Figure 7 is a graph of pendulum drive angular velocity based on a plot of angular position versus time;

Figure 8 is a graphical representation of the angular velocity of the driven roll by means of a plot of the angular position versus time;

Figure 9a -9d is a side view of the Leporellofaltvorrichtung invention in four operating positions to form the Leporellofaltung in four folding steps; and

Figure 10 is a partial perspective view of the invention

Fanfold.

FIGS. 1 to 6 show the drive mechanism according to the invention and its mode of operation. The drive mechanism according to the invention is generally provided with the reference numeral 1.

The drive mechanism 1 serves both to withdraw the fibrous material web (not shown in detail) and the corrugated paper web from a supply roll (not shown) and to transfer the corrugated paper web into a Leporello fold 3, as indicated in FIGS.

In order to provide the conveyor drive for the corrugated paper web, the drive mechanism has a pair of rollers consisting of two opposing rollers 5, 7, wherein in particular only the corrugated roller 5 is driven. The roller 7 is also driven and synchronized with the corrugated roller 5, but may also be free-standing. The rollers 5, 7 define mutually parallel axes of rotation. The rollers 5, 7 are rotatably mounted about their axes of rotation. The rollers 5, 7 are rotatably mounted on a common support structure or support plate 11, wherein the support structure 11 together with the rollers 5, 7, as shown in Figures 4 and 5, is verschenkbar about a pivot axis and reciprocable in the Area of a passage gap 13 parallel to the axes of rotation of the Rolls 5, 7 is located. As can be seen in FIG. 4, the corrugated paper web is oriented substantially vertically in the vertical direction V downwards relative to a Leporello folding stacker (not shown in more detail), whereby a defined Leporello fold 3 can be realized by a reciprocating movement of the pair of rollers 5, 7.

The corrugated roller 5 has a peripheral outer corrugation whose corrugated contour is complementary in shape to a one-sided or bilateral wave contour of the corrugated paper web. In this way, a substantially slip-free feed of the corrugated cardboard web to the Leporellofaltung 3 through the passage gap 13 can be achieved. For the feed of the corrugated paper web is only the corrugated drive roller 5, which is continuously driven in rotation by an electric motor, not shown. To adjust the angular velocity of the drive roller 5 control and a scheme is provided, which is not shown in detail in the figures. As can be seen in FIG. 3, external corrugation is subdivided into a plurality of in particular equally large outer corrugated sections, wherein adjacent outer corrugations are separated by a peripheral recess into which a stripper protrudes in order to lift the corrugated paper web from the drive roller 5.

The smooth roller 7 may be continuously rotationally driven by an electric motor not shown in detail and a corresponding control and / or regulation. The smooth roller 7 serves to bring the wave contour of the corrugated paper web in the form complementary engagement with the corrugated drive roller 5 and to hold there. The surface of the smooth roller 7 may be coated with a friction material such as Teflon®. In operation, the smooth roller 7 and the corrugated drive roller 5 are arranged at a constant distance from each other to form the predetermined passage gap 13. The passage gap 13 is dimensioned such that the corrugated paper web when passing through the passage gap 13 is always in contact with both rollers 5, 7.

In order to realize the Leporellofaltung 3, the support structure 11 together with the rollers 5, 7 is pivoted back and forth about the common pendulum axis, wherein the pendulum axis extends at equal distances from the rollers 5, 7 through the passage gap 13. The pendulum axis lies substantially in a plane defined by the waveboard paper web in the passage gap 13. Thus, the support structure 11 together with the rollers 5, 7 pivots about the pendulum axis, a pendulum drive 15 is provided, which is formed by an electric motor (not shown) and a pulley-connecting rod transmission.

The passage gap 13 defines an exit discharge direction A, which is aligned parallel to the opposite roller tangents in the region of the shortest distance of the opposing rollers 5, 7 in the passage gap 13.

A swivel area sector is set such that the corrugated paper web moves continuously from left to right and right to left from a formed folding edge of the fanfolding unit 3. The swing sector may be greater than 90, preferably about 110 degrees.

In the interaction of the reciprocating motion of the roller pair 5, 7 and the feed of the corrugated paper web realized by the corrugated drive roller 5, it is possible to bring the corrugated paper web into the desired uniform fanfold configuration 3 in a structurally simple manner.

Following the passage gap 13 there is provided a means 17 for guided guiding of the corrugated paper web towards the fanfolding 3, which extends in the exit discharge direction A as well as along the entire width of the corrugated paper web. The guide 17 comprises a base plate portion 21, the passage gap side has an end funnel-shaped scraper 23 which conforms in the region of the circumferential recess 10 substantially tangentially to the respective roller 5, 7, to lift the corrugated paper web from the drive roller. The base plate part 21 comprises two parallel spaced plates defining therebetween a guide shaft 25 for the corrugated paper web. The base plate part 21 is fixedly secured to the support structure 11.

Furthermore, the guide 17 comprises a telescoping movable relative to the base plate member 21 Verfahrplattenteil 31 which is translationally on the base plate member 21 in exit discharge direction A back and forth and which consists as well as the base plate member 21 of two parallel spaced plates between define the guide shaft 25 for the corrugated paper web. The distance of the plates of the Verfahrplattenteils 33 is greater, so that the process plate part 33rd can be translationally moved over the base plate member 21 to form a telescopic mechanism.

In order to set and control a defined backward and forward movement as desired, a sliding block 33 is provided on the outside of the movement plate part 31, which is guided in a frame fixed frame 35 to a matched with respect to the pivotal position reciprocating movement of the Verfahrplattenteils 31 relative to the base plate part 21 to realize.

As can be seen in FIG. 2, the travel plate part 31 lengthens the guide shaft 25, as a result of which an extended guiding property towards the Leporello folding 3 is realized.

At the end of the Verfahrplattenteils 31 is on both sides of the respective plates a Glattstreicheinrichtung 37 in the form of a comb-shaped brush structure with opposing broom sections, as shown in Figures 1 and 3, arranged, which come in an immediate sweeping contact to an uppermost folded position of the Leporellofaltung 3 can, as indicated in the figures 9.

The telescoping mechanism of the guide 13 is set such that the free end of the screed 37 extends substantially in a horizontal plane when the guide 17 oscillates from left to right and back to form the Leporellofaltung 3. It is ensured in this way that a guide-free distance between Leporellofaltung 3 and the drive mechanism 1 remains as short as possible and that a smooth sliding function as long as possible on the uppermost layer of the Leporellofaltung 3 is.

As can be seen in Figures 4 and 5, the Verfahrplattenteil 31 is brought in the most extended position in the pendulum turn-out position following the slightly arcuate and substantially horizontal slide 35, as shown in Figure 5 can be seen. The furthest retracted position is shown in Figure 4, namely, when the exit discharge direction A coincides with a vertical V, that is, the pair of rollers 57 passes through the shuttle center passage position.

The adjustment of the length of the guide shaft 25, the distance of the free end of the guide 17 to the Leporellofaltung 3 and / or the distance of the free end of the guide 17 to the passage gap 13 depends in the embodiment of the Figures 4 and 5 from the pivot position of the roller pair 5, 7 from. It is clear that other control parameters, such as the conveying speed, for distance control and the guide shaft length control can be used. It is clear that this distance control can also be realized continuously and depending on the operation, ie without a fixed backdrop.

As can be seen in Figures 6a to 6d, the pulley-connecting rod transmission is realized by a plurality of drive pulleys, wherein an engine-side drive pulley 41 via a connecting rod 43 drives a first pulley 45 which is in engagement with a driven pulley 47 via the belt 49 to the To realize reciprocating motion of the pair of rollers 5, 7.

The pendulum drive according to FIGS. 6a to 6b is designed to convert a continuous rotational movement of the drive disc 41 into a reciprocating movement of the drive pulley 47 and thus of the roller pair 5, 7. In this case, the connecting rod 43 is slightly shorter than the center axis distance between the drive pulley 41 and the first pulley 45 executed.

In Figure 6a, the vertical pendulum means passage position is shown. In position 2 (FIG. 6b), the left pendulum outer reversal position is shown, while FIG. 3 shows the pendulum midway position again. In Figure 4, the right pendulum outer reversal position is shown.

It was found that a uniform pendulum motion with uniform pendulum speed often led to a buckling and tension of the corrugated paper material to be laid for Leporellofaltung. In this respect, an angular velocity adjustment for the pendulum motion with respect to the drive pulley 41 is necessary, as shown in FIG.

In the figures 7 and 8, the control mechanism according to the invention with respect to the pendulum drive angular velocity and the roll angular velocity of the driven roller 5, 7 will now be explained.

As can be seen in Figure 7, the angular velocity of the pendulum drive from the shuttle center passage position is negligibly small and gradually increases reached in position 2, the highest angular velocity. In this way, it is ensured that the exit discharge direction A does not remain in the reversing position for too long, but is accelerated back out of it into the passing position.

From position 2, the angular velocity decreases again and reaches a minimum at position 3, so that the shuttle center passage position is not crossed too fast. In this way, enough corrugated paper web material can be folded. From position 3 to position 4, the angular velocity increases again continuously and reaches the maximum angular velocity in position 4, which decreases again towards position 1.

From this profile of the pendulum drive angular velocity, in particular for the drive pulley 41, it is clear that the processing of the corrugated paperboard material must be more rapid, especially at the pendulum turnaround, so that there should be a higher angular velocity, so that there can be no strong tension or warp of the corrugated paperboard material there.

FIG. 8 shows the angular velocity profile for the rotating rolls 5, 7. Again, the angular velocity is adjusted depending on the position of the pendulum motion.

As can be seen in Figure 8, the angular velocity is highest at positions 1, so that the corrugated paper stock is most rapidly conveyed toward the leporello-fold to meet higher material requirements. The angular velocity decreases significantly from position 1 to position 2 and essentially reaches a minimum at position 2. From position 2 the angular velocity increases again and reaches its maximum in position 3, from where the angular velocity gradually decreases again and the minimum in position 4 reached. From position 4 to 1, the angular velocity increases again significantly.

As can be seen by comparing FIGS. 7 and 8, the angular position profiles, in particular the angular velocity profiles, run in opposite directions and are coordinated so that fewer corrugated paper web material is provided in positions 2 and 4 and the positions are left faster, with positions 1 and 3 more corrugated paper web material is provided and the positions are left more slowly. It turned out that with above Angular speed settings can be achieved a precise and uniform Leporellofaltung even with regard to higher conveying speeds, which can be over 40 or 50 m / min.

In order to mold irreversible lateral edge folds into the corrugated paper web, as shown in FIGS. 9a to 9d and 10, a pair of left and right low pressure punches 51, 53 are provided for a Leporello folding device 50 according to the invention, which feeds onto the Leporello fold 3 essentially in the vertical direction V. can be relocated from this path. The press-down punches 51, 53 may extend over the entire width of the corrugated paper web. The depressing punches 51, 53 are operated by a separate drive 55, which provides a continuous rotational movement of a drive pulley in only one direction of rotation. A multi-link transmission serves to implement a vertical up and down movement of the press-down punches 51, 53 from the rotational movement of the drive pulley. The press-down punch 51, 53 has a pressure-engaging position in which the Leporellofaltung for folding suppresses, and a release position in which the Niederdrückstempel 51, 53, the Leporellofaltung 3 releases.

As can be seen in FIG. 10, the low-pressure punch comprises a comb structure 6 of a plurality of blunt stamp tines 63 arranged in a row, with adjacent punch tines 63 being separated at regular intervals by recesses.

Furthermore, the Leporello folding device has a retainer in the form of a pair of left and right retention feet 67, 69, each having a substantially horizontally extending finger assembly. The horizontal finger arrangement is dimensioned such that they can enter and exit the recesses of the comb structure 61 of the press-down punches 51, 53.

The retaining device is connected to a drive device (not shown in more detail), which enables a substantially horizontal pivoting in and out of the respective retaining foot. The retaining foot is dimensioned such that it partially protrudes beyond the leporello fold edge. The retaining device serves to prevent unfolding of the Leporellofaltung then, when the Niederdrückstempel 51, 53 away from the respective side of the Leporellofaltung. The retainer has a Active position in which it prevents the Leporellofaltung 3 from unfolding, and a passive position in which it releases the Leporellofaltung 3.

The press-on punches and the retaining device can be structurally coordinated with one another in such a way that they come into contact with the Leporello folding in the width direction of the Leporello folding substantially at the same position adjacent to the respective fold. The depression punches and the retaining device have an axisymmetric structure to a vertical axis V.

As can be seen in FIGS. 9a to 9d, both the restraint device and the low-pressure device each have independent travel kinematics that are coordinated with one another. In principle, the respective left or right depressing punch should be moved into the release position if a respective left or right retaining foot has assumed the active position. When a respective left or right depressing punch is still in the pressure-engaging position, a respective left or right retaining leg moves to the active position. At any one time of the laying of the fanfolding 3, at least one of the four left and right retention feet and depression punches is in the active or pressure engagement position.

In Figure 9a, the guide 17 is just about to pull the corrugated paper web from left to right from the just implemented folding edge, at the same time the coater 37 smoothes the underlying layer and the left retaining foot 69 keeps the Leporellofaltung 3 stable. The left depressing punch 53 is about to press down on the Leporellofaltung to apply a folding force thereon and thereby introduce an irreversible fold in the corrugated paper web. Before the press-down punch exerts a pressing force in its pressure-engaging position, as shown in FIG. 9b, the retaining foot 69 must first be swung out of its active position. In FIG. 9b, the exit discharge direction A is located exactly in the vertical V, that is to say in the shuttle center passage position, the left depression punch 53 communicating the pressing force of the Leporello folding 3 in its pressure engagement position. Then there is no need for the left retention leg 69 to be in the active position and to be swung out. To end the upper layer of the Leporellofaltung, the right Niederdrückstempel 51 has come into the release position, the right Rückhaltefuß 67 prevents the Leporellofaltung in unfold. Due to the flat shape of the horizontal finger assembly and its external mounting, the upper layer of the Leporellofaltung 3 can easily be placed on the finger assembly without the right retaining foot 67 must be moved to the passive position, which is shown in Figure 9c. Once the guide has moved slightly away from the folding edge, the right depressing punch 51 is brought into the pressure engaging position to produce the fold. The right retaining foot 67 can remain in the active position, and the left depressing punch 53 can be brought to the release position, while the left retaining foot still holds the Leporellofaltung 3 down.

The features disclosed in the foregoing description, the figures and the claims may be of importance both individually and in any combination for the realization of the invention in the various embodiments.

LIST OF REFERENCE NUMBERS

I drive mechanism 3 Leporellofaltung

5, 7 rolls

9 external corrugation

10 circumferential recess

I I support structure

13 passage gap

15 pendulum drive

17 establishment

21 base plate part

23 scrapers

25 guide shaft

27 guide rod

31 travel board part

33 sliding stone

35 scenery

37 coating device

41 drive pulley

43 connecting rod

45 Pulley

47 Output pulley

49 straps

51, 53 press-down punches

55 drive

61 comb structure

67, 69 Hold-down foot

A Exit Dispensing Direction

V vertical

H horizontal

Claims

Drive mechanism for a device for laying a fibrous material web Leporellofaltung claims

1. Drive mechanism for a device for laying a particular unfolded fibrous material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web, in a Leporellofaltung comprising a pivotally mounted pair of opposing rollers which form a passage gap for the fiber material web and in particular for conveying the fibrous material web are rotatable by the passage gap, and a drive for pivoting the pair of rollers, wherein during pivoting defined by the passage gap discharge discharge direction preferably oscillates back and forth about a vertical, characterized in that förderflußabwärts the passage gap with the pair of rollers reciprocating means for guided Conducting the fiber material web is arranged towards the Leporellofaltung.

2. Drive mechanism according to claim 1, characterized in that the guide means a driver, in particular two opposing, in particular mutually parallel driver plates or rods, which defines a receptacle for the passage gap leaving fibrous material web in both pendulum directions that the fiber material web is taken in the respective pendulum direction during conveyance through the receptacle, wherein in particular the driver is adapted to keep the free discharge end in the reciprocating motion substantially on a horizontal and / or in a horizontal plane, and / or a length of Mitnehmer in exit discharge direction, in particular during the reciprocating motion is preferably continuously adjustable, so that preferably a free end of the driver during the reciprocating movement substantially on a horizontal or horizontal plane and / or so that v Orzugsweise a particular vertical distance of a free End of the driver remains substantially constant to an upper folding position of the Leporellofaltung.

3. Drive mechanism according to claim 1 or 2, characterized by a distance setting, in particular-regulation, which sets a distance in the exit discharge direction between the guide, in particular the driver, and the passage gap preferably in response to a pivot position of the exit discharge direction and / or a conveying speed of the fiber material web or preferably, such that the distance is maximized at a pendulum outer reversal position and / or minimized at a shuttle center position.

4. Drive mechanism according to one of the preceding claims, characterized in that the guide has a preferably extending in the exit discharge direction guide shaft in particular extension of the passage gap and / or constant width in the exit discharge direction, in particular the length of the guide shaft in exit discharge direction preferably from the passage gap to a in particular the length to be set depends on the pendulum position and / or a conveying speed of the fibrous material web, in particular on the side adjacent to the passage gap of the guide shaft, a scraper is fixed, in particular contactless and / or tangential to the pair of rollers is applied.

5. Drive mechanism according to one of the preceding claims, characterized in that the guide device has a telescopic mechanism with a fixedly connected to the pair of rollers base part and a particular linearly displaceable back and forth in the exit discharge direction Verfahrteil, in particular an extension and retraction of the Verfahrteils by means of a in particular arcuate slot is determined, which is stationary, in particular fixedly mounted on a support frame of the device, and / or engages a fixedly mounted on the Verfahrteil sliding block, so that in particular in both pendulum reversal positions the extension is placed in the most extended position and / or in the shuttle center passage position the traveling part in the furthest brought retracted position, wherein in particular the base part is guided by a further, in particular rectilinear scenery, which is stationary, in particular fixedly mounted on a support frame of the device, and / or in which a firmly attached to the base member sliding block engages.

6. Drive mechanism according to one of the preceding claims characterized in that a flexible device, in particular a broom with bristles extending substantially parallel to the exit discharge direction, for smoothing a topmost position of the Leporellofaltung is arranged at one end of the guide, in particular the Ausfahrteils.

7. Drive mechanism, in particular according to one of the preceding claims, for a device for laying a particular unfolded fiber material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web (1), in a Leporellofaltung, comprising (i) a pivotally mounted pair of opposing rollers which form a passage gap for the fibrous material web and in particular are rotatable through the passage gap when conveying the fibrous material web, (ii) a pivoting drive, by means of which the pair of rollers is pivotable, such that an exit discharge direction defined by the passage gap preferably oscillates back and forth about a vertical, characterized in that the pivot drive is operatively coupled to a means for adjusting, in particular regulating, the pendulum drive angular speed for the roller pair, the adjusting means being arranged to adjust the pendulum drive angular speed as a function of the speed Set from a pivoting position of the exit discharge direction, in particular such that in the area of the pendulum outer reversal position, in particular on arrival in the pendulum outer reversal position and leaving the pendulum outer reversal position a higher drive angular velocity in particular a rotating drive pulley of the pivot drive, preferably the highest drive angular velocity with respect to the back and forth is and / or that in the area of the pendulum means passage position, in particular when passing through the shuttle means passage position, a lower drive angular velocity, in particular the lowest drive angular velocity with respect to the back and forth pendulum is set.

8. Drive mechanism, in particular according to one of the preceding claims, for a device for laying a particular unfolded fibrous material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web, in a Leporellofaltung, comprising (i) a pivotally mounted pair of opposing rollers, the one Forming passage gap for the fiber material web and in particular in conveying the fiber material web through the passage gap are rotatable, (ii) a roller drive, the at least one of the two rollers for conveying the fiber material web through the passage gap rotates towards Leporellofaltung, and (iii) a pivot drive through in that the pair of rollers is pivotable, so that a discharge discharge direction defined by the passage gap preferably oscillates back and forth about a vertical, characterized in that the roller drive with a control and / or regulation of an angular velocity the at least one driven roller is operatively coupled, wherein the control and / or regulation is adapted to adjust the angular velocity in response to a pivotal position of the exit discharge direction, in particular such that the speed of rotation of the driven roller is in the range of a pendulum outboard reversal position, especially on entry into the pendulum outer reversal position and at the exit, is smaller, especially lowest with respect to the reciprocating pendulum, and / or that the angular velocity of the driven roller in the area of the shuttle passage position is greater, especially greatest with respect to the back and forth.

9. An apparatus for laying a particular unfolded fibrous material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web, in a Leporellofaltung, comprising a tray on which a set for Leporellofaltung fiber material web stack is folded away especially for its further transport away from the device, and a Leporellofaltmechanismus which brings the fibrous material web into a Leporellofaltung and in particular has a trained according to one of the preceding claims, geken nz eichnet by means for depressing the Leporellofaltung particular adjacent their respective fold edge, the depressing device in particular substantially in the vertical direction between a pressure engagement position, in the the depressing device depresses the Leporellofaltung for wrinkling, and a release position is movable, in which the depressing device the Leporellofaltung releases, and a retaining device which prevents the Leporellofaltung because of their elastic restoring forces, at least temporarily at a deployment when the depressing device is in the release position.

10. The device according to claim 9, characterized in that the retaining device is movable in particular in the horizontal direction between an active position in which the retaining device prevents the Leporellofaltung from unfolding, and a passive position in which the retaining device releases the Leporellofaltung, and / or the depressing device and the retaining device are structurally coordinated with one another in such a way that they engage the Leporell fold in the width direction of the Leporello folding substantially at the same location adjacent to the respective fold, and / or that the depressing device has a comb structure which is preferably characterized by a particular regular sequence of coming with the Leporellofaltung in pressure contact in particular blunt pressure prongs and spaces between the pressure prongs is formed, and the retainer has a comb structure, the vorz In particular, the retaining tines each have an extension to form a retaining contact surface, which is preferably substantially parallel to the position of the Leporellofaltung and / or preferably by a particular regular sequence of Leporellofaltung in retaining contact coming into retaining contact coming blunt retaining tines and recesses between the retaining tines extends at least in the active position substantially horizontally, in particular, the Karnmstruktur and the comb structure are configured so that they can engage, in particular the retaining tines in the free spaces and retract, especially when the retaining means or the Niederpressückeinrichtung in the Active position or in the pressure-engaging position, in particular, the extension is dimensioned such that it is in the active position in the width direction of the Leporellofaltung on the respective fold since stands out.

11. The device according to claim 9 or 10, characterized in that the depressing means an axisymmetric to a central axis of the Leporellofaltung in the width direction arrangement of a left and right Niederdrückstempel in particular for alternately depressing the Leporello- folding and / or the retaining device has an axisymmetric to a central axis of the Leporellofaltung in the width direction arrangement of a left and right retaining arm or foot in particular for alternately preventing the Leporellofaltung at the deployment.

12. Device according to one of claims 9 to 11, characterized in that traversing kinematics of the retaining device and the depressing device so matched, in particular synchronized, are that a respective left or right Niederdrückstempel moves into the release position, when a respective left or right retaining arm the Has taken active position, and / or that a respective left or right retaining arm moves into the active position when a respective left or right punch is still in the pressure-engaging position, and / or that at any time the laying of the Leporellofaltung at least one of the four left and right retaining arms and press-down punches in the active position or pressure-engaging position.