EP2605988B1 - Drive mechanism for a device for laying a fibrous material web in a leporello fold - Google Patents

Description

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

A corrugated track is often used for packaging purposes, for example by laying corrugated cardboard layers separated from one another for cushioning goods that are to be transported next to one another. A corrugated cardboard blank can be contoured on one side or on both sides. In the case of a web of corrugated cardboard contoured on one side, one side is formed by a corrugated paper layer to which a smooth paper layer is glued to form the other side. It is clear that the corrugated cardboard web can also be formed by several flat and / or corrugated paper layers placed one on top of the other to increase the buffering property of the packaging material.

For packaging, it is customary to pull the packaging material from a packaging material source, which can be present either as a wound roll or as a Leporello folding stack. The cuboid Leporello folding stack has the advantage of space-saving storage compared to the cylindrical take-up roll because, on the one hand, a higher material density is achieved due to the Leporello folding that the respective wave-valley shape of opposing folded layers can interlock, and on the other hand the cuboid Leporello folding stacks are simple and space-filling can be stacked next to each other. Even when pulling off or unfolding the fiber material web from the wound roll or from the Leporello folding stack, the Leporello folding has the advantage that the unfolding Leporello folding is stationary and does not, as in contrast to the roll, perform a rotational movement during development, which requires special storage properties and a need for hut space . In the production of the fiber material web it is so that these are usually made available on rolls at the end of the production process, so that the creation of a fan-fold pile would first have to unwind the fiber material web from the reels and bring the fan-fold fold.

A device for laying an in particular unfolded, endless fiber material web in a fan-fold fold is from DE 196 44 383 C1 known. The Leporello folding device has a drive mechanism in the form of a translationally reciprocable conveyor belt pair with two vertically arranged drive belts. In order to achieve the fan-fold zigzag fold, the vertically aligned drive belts are shifted translationally back and forth in the horizontal direction.

Out DE 35 00 766 A1 a drive mechanism for a fan-fold direction is also known, in which a drive roller connected upstream of a pair of pendulum rods pulls a radial path from a material web source and feeds it to the pair of pendulum rods, which is intended to form the fan-fold fold by pivoting to and fro.

DE 196 64 858 discloses a drive mechanism for a fan-fold fold in which a pull roller pulls off the material web. The draw roller is fixedly attached to the support frame of the device of the fan-fold device. The fanfold is carried out using a swivel arm with two guide pins.

JP 11 255423 A shows a drive mechanism for fan-fold folding, with a pair of rollers oscillating with the delivery part. The folding of the paper web is supported by a hold-down mechanism at the turning points of the fiber material web.

All of the above known drive mechanisms for a fan-fold fold have the common disadvantage that they require a considerable amount of space in order to implement the drive mechanism by means of drive belts or a combination of a drive roller and a swivel mechanism. In addition, with the known drive mechanisms, there is a high component material expenditure and wear and tear, and a large number of components is required.

It was also shown that the drive mechanisms are not designed to achieve higher conveying speeds of up to 30 or 40 m per minute without having to accept any losses in terms of the quality of the fold formation of the fan-fold folds.

The object is to overcome the disadvantages of the prior art, in particular to provide a drive mechanism for a fan-fold device and a fan-fold device in which, with the simplest possible construction, space requirements are as small as possible clean fan-fold for the fiber material web at conveying speeds of over 30 m / min.

This object is achieved by the features of claim 1.

The invention, as defined in claim 1, provides a drive mechanism for the device for laying an in particular unfolded fibrous material web, in particular a paper web and a corrugated paper web, such as a corrugated cardboard web, in a fan-fold. The drive mechanism comprises a pivotably mounted pair of rollers lying opposite one another, which form a passage gap for the material fiber material web and, in particular, can be rotated for conveying the fiber material web through the passage gap. It is this pair of rollers which is intended to oscillate back and forth by a drive for pivoting the pair of rollers.

The passage gap defines an exit delivery direction of the fiber material web in the conveying direction away from the passage gap, which can in particular be defined by mutually parallel tangents on the smallest passage of the passage gap. When the pair of rollers is pivoted, the exit delivery direction for the fiber material web defined by the passage preferably oscillates back and forth about a vertical. It can pass through a pendulum center passage position in the vertical while pendulum outer reversal positions laterally limit the pendulum amplitude of the pair of rollers, in particular the exit discharge direction. According to the invention, a device oscillating back and forth with the pair of rollers for guided guiding of the fiber material web towards the fan-fold fold is arranged downstream of the passage gap. In order to be able to swing back and forth with the pair of rollers, the guide device is firmly attached to them.

It was found that with the measure according to the invention of providing a leading guide device for the fiber material web in the flow-directed connection to the passage gap, a precise leporello folding can always be ensured in a simple and controlled manner at the same point, which leads to the conveying speed of the fiber material web through the drive mechanism increase. Surprisingly, it was also found that when the top Leporello fold is formed, because of the arrangement of the leading guide device, bulging of the fiber material web is avoided, so that the next Leporello fold can be realized in a precisely positioned manner. The fiber material web is always put under tension from one fold to the next by the guide device, which avoids arching between two folds. Without the guide device according to the invention, there may be disadvantages in the horizontal positioning of the fold of the fan-fold that is to be formed in each case because of the inhomogeneity of the material web that may be present. It was found that due to the forces directed towards the center of the fan-fold fold, such as the Horizontal components of the weight of the web of material as well as horizontally acting air resistance forces cause "premature" wrinkling. An irregular early fold formation leads to an uneven stack shape and to an excess of material in the formation of the subsequent layer, so that the subsequent folding is carried out "too late" and the folding edge protrudes beyond the fanfold stack. The guide device according to the invention is designed to minimize the forces to be applied to the material web for guiding and guiding after the passage gap, but to ensure a controlled, precise, horizontal positioning of each fold of the fanfold stack. The guide device mainly exerts guide pressure forces against the forces acting horizontally towards the center of the Leporello folding stack and thus prevents the early folding.

In a preferred embodiment of the invention, the guide device has a driver, in particular two driver plates or rods that lie opposite one another, in particular that are arranged 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 it is passed through the receptacle. In this way, the desired tensile stress of the fibrous material web is communicated when the fibrous material web is slightly pulled from the last folded fold to the opposite side.

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

In a preferred embodiment of the invention, the driver is designed to hold its free delivery end essentially on a horizontal and / or in a horizontal plane during the back and forth movement. As an alternative or in addition to this, a length of the driver in the exit delivery direction is preferably continuously adjustable, particularly during the to-and-fro movement, so that a free end of the driver runs essentially on a horizontal or horizontal plane during the to-and-fro movement. Alternatively or in addition to this, the driver can do so be designed, a vertical distance of a free end of the driver to the last folded position of the fan-fold fold remains essentially constant. 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 fan-fold, a significantly increased conveying speed for the fiber material web is possible in order to lay the fan-fold precisely.

In a preferred embodiment of the invention, the distance setting, in particular control, sets or regulates the distance as a function of a pivot position of the exit direction and / or a conveying speed of the fiber material web, preferably such that the distance is maximized in the pendulum outer reversal position and / or in a Pendulum center passage position is minimized.

In a further development of the invention, the guide device has a guide shaft that preferably extends in the exit direction, in particular as an extension of the passage gap and / or of constant width. The length of the guide shaft in the exit delivery direction can preferably be adjustable from the passage gap to a free end of the guide device. The length to be set can depend on the pendulum position and / or a conveying speed of the fiber material web. A scraper can be firmly attached to the side of the guide shaft adjacent to the passage gap 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. The scraper can rest against the pair of rollers.

In a further development of the invention, the guide device comprises a telescopic mechanism with a base part fixedly connected to the pair of rollers and a moving part which can be displaced back and forth with respect to the base part, in particular in the exit discharge direction. The moving part can have a smaller dimension in order to be able to move into the base part with the correspondingly larger internal dimensioning. It is clear that the moving part can also be designed to be able to accommodate the base part in a movable manner.

An extension and retraction movement of the moving part with respect to the base part can be determined by means of a preferably arched link which is stationary, in particular fixed can be attached to a support frame of the device. As an alternative or in addition to this, a sliding block fixedly attached to the moving part can engage in the gate, so that in both pendulum reversal positions the extending part is brought into the most extended position. As an alternative and in addition to this, the extending part can be brought into the pendulum center passage position in the most retracted position of the moving part with respect to the base part.

In a preferred embodiment of the invention, at one end of the guide device, which can be formed from a rigid material, in particular at one end of the extendable part, there is a flexible device, in particular a broom with bristles extending essentially parallel to the exit direction for smoothing a layer placed on top arranged in the fan-fold. In the transverse direction of the fiber material web, the broom can preferably have a comb shape with protruding broom tines each with a plurality of broom bristles, the broom tines being separated from one another by essentially the same distances.

In addition, in a preferred embodiment, the drive mechanism according to the invention has a swivel drive, by means of which the pair of rollers can be swiveled so that an exit discharge direction defined by the passage gap preferably oscillates back and forth about a vertical. The pivot drive can preferably be implemented by a connecting rod drive, with a continuous rotary movement in particular of a drive gear part, such as a drive pulley, generally being converted into a pivot movement, preferably of the pair of rollers. The connecting rod drive has a drive pulley to which a connecting rod is articulated, which in turn is coupled to an output pulley which only executes a pivoting movement and allows the pair of rollers to oscillate. The connecting rod drive has a kinematic dead center, in particular in the two outer swivel reversal positions, at which the angular swivel speed of the output disk is negligibly low. According to this subject matter of the invention, the swivel drive is operationally coupled to a device for setting, in particular regulating, the drive angular speed, in particular the drive pulley.

The setting device is designed to set the drive angular speed as a function of a pivot position of the outlet delivery direction. The setting can be determined in such a way that a higher drive angular speed of the drive pulley, preferably the highest pendulum drive angular speed with respect to the entire reciprocating movement, is set in the area of the pendulum outer reversal position, in particular when reaching the pendulum outer reversing position and / or when leaving the pendulum reversal position. As an alternative or in addition to this, a lower pendulum drive angular speed, in particular the lowest drive angular speed of the drive pulleys with regard to the entire reciprocating movement of the outlet discharge direction, can be set in the area of the pendulum center passage position, in particular when passing through the pendulum center passage position. With the increase in the drive angular speed of the drive discs at the pendulum outer reversal positions, it is ensured that the time spent in the pendulum outer reverse position is shortened, while a reduction in the drive angular speed of the drive discs when passing through the pendulum center passage position is accompanied by a reduction in the pendulum speed. In this way, a uniform material web feed along the entire reciprocating path can be realized.

In a preferred embodiment of the invention, the drive mechanism has a roller drive which rotates at least one of the two rollers for conveying the fiber material web through the passage gap towards the fan-fold. Furthermore, the drive mechanism has a swivel drive, by means of which the pair of rollers can be swiveled 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 transmits rotational forces to at least one roller about its axis of rotation in order to drive the fiber material web in rotation, is operationally coupled to a control and / or regulation of an angular speed of the at least one driven roller. The open-loop or closed-loop control system is designed to set the angular speed as a function of a pivot position in the exit direction. The angular velocity can be set in this way be designed so that the angular speed of the driven roller in the area of a pendulum outer reversal position of the exit discharge direction, especially when reaching and / or leaving the pendulum outer reversal position, is set to be lower, in particular at the lowest level with respect to the total reciprocating movement. As an alternative or in addition to this, the angular speed of the driven roller in the area of the pendulum center passage position of the exit discharge direction can be set to be greater, in particular greatest, with respect to the entire reciprocating movement.

Finally, in a preferred embodiment, the invention relates to a Leporello folding device with a shelf on which a stack of fiber material webs laid for Leporello folding is put together, in particular for its further transport away from the device. Furthermore, the Leporello folding device has a Leporello folding mechanism, which brings the fiber material web into a Leporello fold and can have one of the above-mentioned subjects of the invention relating to the drive mechanism. The Leporello folding device according to the invention has a device for pressing down the Leporello folding, in particular adjacent to its respective lateral closing fold, the pressing device in particular essentially in the vertical direction between a pressure engagement position in which the pressing device depresses the Leporello folding to form folds, and a release position in which the pressing device is movable Releases fan-fold. Furthermore, the Leporello folding device according to the invention has a retaining device which at least partially prevents the Leporello folding from unfolding because of its elastic restoring forces when the depressing device is in the release position or there.

In a preferred embodiment of the invention, the restraint device can be moved between an active position, in which the restraint device prevents the Leporello folding from unfolding, and a passive position, in which the restraint device releases the Leporello fold.
In a further development of the invention, the press-down device and the retaining device are structurally coordinated with one another in such a way that they come into engagement with the fan-fold fold in the width direction of the fan-fold fold essentially at the same point adjacent to the respective fold.

The press-down device preferably has a comb structure which is formed in particular by a preferably regular sequence of, in particular blunt, pressure prongs that come into pressure contact with the leporello fold and free spaces between the pressure prongs. The retaining device has a comb structure which is preferably formed by a particularly regular sequence of the retaining prongs, in particular blunt retaining prongs, coming into retaining contact with the leporello fold, and recesses between the retaining prongs. The retaining prongs can each have a horizontal extension to form a retaining contact surface, which preferably extends essentially parallel to the position of the fan-fold fold, in particular the uppermost position of the fan-fold fold, and / or at least essentially horizontally in the active position.

Preferably, the comb structure and the comb structure of the depressing device or the retaining device can be configured in such a way that they can interlock, in particular the retaining prongs can retract and extend into the free spaces, in particular when the retaining device or the depressing device is in the active position or in the pressure engagement position are. The extension can be dimensioned in such a way that in the active position it protrudes laterally in the width direction from the Leporello fold beyond its respective fold.

In a preferred embodiment of the invention, the press-down device has an arrangement which is axially symmetrical in the width direction, in particular to the central axis of the fan-fold fold, of a left and a right press-down die, in particular for alternately pressing down the fan-fold fold. As an alternative or in addition to this, the restraint device has an arrangement which is axially symmetrical in the width direction, in particular to a central axis of the leporello fold, and consists of a left and right restraint arm or foot, in particular for alternately preventing the leporello fold from unfolding.

In a preferred embodiment of the invention, the kinematics of travel, in particular the gears and / or articulated rod systems, the restraint device and the hold-down device are coordinated with one another, in particular synchronized, in such a way that a respective left or right hold-down ram moves into the release position when a respective left or right holding arm is active Has taken position. As an alternative or in addition to this, a respective left or right retaining arm moves into the active position when a respective left or right press-down ram is still in the Is pressure engagement position. As an alternative or in addition to this, at least one of the four, left and right, retaining arms and press-down rams is in the active position or pressure engagement position at the time the fan-fold fold is laid.

A particular embodiment relates to at least one of the two rollers of the roller pair that is driven in order to carry out the conveyance through the passage gap. At least one of the rollers has an arrangement of parallel grooves over the entire circumference, which are preferably shaped to correspond to the corrugation of the fiber material web. The grooves extending parallel to and in the longitudinal direction of the roller have essentially a sequence of identical groove dimensions. The groove arrangement is divided into several equal sections, the sections being interrupted by a depression. This indentation or recess runs completely around the roller and in particular has a width that is essentially constant in the circumferential direction. A scraper can continuously intervene in the circumferential recesses, which can be arranged at equidistant intervals. The scraper is used to lift the fiber material web when it leaves the passage gap from the drive roller, so that the fiber material web can reach the guide device with as little resistance as possible.
The drive mechanism, which can also be referred to as a folding mechanism for a device for laying an in particular unfolded fiber material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web, in a fan-fold, comprises at least the pair of opposing rollers. The rollers each define an axis of rotation, which axes of rotation do not coincide. The rollers rotate about their own axis of rotation, especially when the fiber material web passes through the passage gap.
A rotary shaft roller drive at least one of the two rollers for conveying the fiber material web through the gap formed by the rollers to the fan-fold stacking, and a pivot drive has in particular a pendulum axis that does not coincide with the rotary axes. The at least two rollers are pivotably mounted in such a way that, when actuated by the pivot drive, the axes of rotation of the rollers are pivoted to and fro about the common pendulum axis.

It is possible to significantly reduce the dimensions in particular of the drive mechanism and thus of the entire Leporello folding device, especially in the height direction, regardless of the desired width of the Leporello folding to be laid. In addition, it was found that only a single pair of rollers with at least one roller driven by them is sufficient to produce a Leporello folding stack. Due to the significant reduction in dimensions, particularly in the height direction, the amplitudes of movement of the components of the drive mechanism are also significantly reduced. Taking into account that corrugated cardboard webs usually have a width of at least 1000 mm, it was found that the measure according to the invention and the associated reduction in overall height result in less air turbulence due to the reduced movement amplitudes, which reduces the air resistance and thus that of driving the Drive mechanism necessary energy. In addition, it was shown that the fiber material web, in particular in the case of paper webs, is less affected by the less strong air turbulence, which enables more precise fan-fold folding. In addition, the production speed for fan-fold folding can be increased.

In a preferred embodiment, the pendulum axis is essentially parallel to the axes of rotation, which enables a simple structural design. The pendulum axis is preferably arranged in the area of the passage gap, whereby the structural height and the dimensions of the drive mechanism and the fan-fold device can be minimized.

In a further development, the center distance between the pendulum axis and the axes of rotation of the rollers and / or a width of the passage gap remains constant during an entire reciprocating movement of the roller pair. In this way a precise fan-fold can be achieved.

In a preferred embodiment, connecting straight 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 swivel amplitudes of components of the drive mechanism as small as possible.

In a further development, 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, the pendulum axis extends past between the rollers. The pendulum axis preferably extends through the passage gap at essentially equidistant, shortest distances from the at least two rollers. The pendulum axis can be arranged in the area of the fiber material web, in particular parallel to it, preferably in a plane which is defined by the fiber material web in the area of the passage gap, in particular in the passage gap.

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

The swivel angle sector is preferably symmetrical to the vertical direction on which the pendulum axis is arranged. The swivel angle sector can be set as a function of a distance between the passage gap and the depository, in particular to an uppermost folded sheet of the already laid fiber material web stack, and as a function of a width of the fan-fold fold.

In a preferred embodiment, the axis of rotation roller drive and the swivel drive are coordinated with one another in such a way that when the fiber material web is placed in the leporello fold, a delivery direction for the fiber material web defined by the passage gap points towards a fold end of the fiber material web stack at which the next fan-fold of the fan-fold is to be formed. The delivery direction can be opposite to each other at the shortest distance by parallel tangential directions Circumferential locations of the rollers can be defined, in particular the circumferential locations being defined in particular by points of contact of the fiber material web on the rollers.

In a preferred embodiment, the drive mechanism is designed without a further roller, in particular without further mechanical intervention on the fibrous material web, between the at least two rollers and the last laid fan-fold fold of the fan-fold. It can be provided that only a single drive roller is provided for advancing the fiber material web.

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

In a preferred embodiment, the swivel drive has an output disk, the axis of rotation of which preferably coincides with the pendulum axis P. The swivel drive can have a drive pulley which is coupled to the output pulley in particular via a force transmission means such as a toothed belt. A connecting rod is articulated via an output articulation point eccentric to an axis of rotation of the drive pulley and articulated to the drive shaft through a drive articulation point eccentric to the axis of rotation of the drive shaft. Center-to-center distances between the articulation points are set in such a way that with a continuous drive rotation of the drive shaft, a pendulum pivot movement is carried out by the drive pulley in only one direction of rotation. The central axis distance of the output pivot point is preferably greater than the central axis distance of the drive pivot point.

Preferably, the center axis distance of the output articulation point on the drive pulley is adjustable, with several output articulation points being provided in particular in the form of holes for receiving coupling pins of the connecting rod on the drive pulley.

In a preferred embodiment, the rollers are adjustable between fixed operating positions and can be locked in the operating positions, one operating position defining a large distance for threading the fibrous material web between the at least two rollers and one operating position defining a small distance forming the passage gap.

In a preferred embodiment, the fiber material web is fed in its longitudinal direction exclusively via the rotary axis roller drive, in particular via exclusively one driven roller of the roller pair.

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

The axis of rotation roller drive preferably has a servomotor, in particular for each roller.

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

In a preferred embodiment, one roller of the roller pair is designed to press the driven roller into positive engagement with a surface contour of the fibrous material web, in particular essentially without imparting conveying drive forces to the fibrous material web in the conveying direction.

In a preferred embodiment, the driven roller, in particular only the driven roller, has an outer contour, in particular a corrugated outer corrugation, which is shaped in particular to a preferably corrugated surface contour of the fiber material web in such a way that contour peaks, in particular wave peaks, and contour valleys, in particular wave troughs, of the fiber material web substantially complementary in shape with contour valleys, in particular wave valleys, and contour peaks, in particular wave peaks, of the outer contour of the driven roller come into engagement.

In a preferred embodiment, one of the rollers is designed with an essentially smooth surface which, in particular, is designed to be low-friction with respect to the fiber material web, preferably formed by uncoated aluminum.

In a further development, the drive mechanism is provided with a control and / or regulating device which synchronizes the swivel drive and the axis of rotation roller drive.

Furthermore, in a preferred embodiment, the invention relates to a device for laying a particularly unfolded fibrous material web, in particular a paper web or a corrugated paper web, such as a corrugated cardboard web, in a fan-fold fold. In this case, the fiber material web is separated from a fiber material web stack laid for fanfold, in particular by cutting a horizontally mounted support plate from a passive rest position adjacent to the fiber material web stack between an upper and a lower folded sheet of the fiber material web stack, so that the fiber material web in the area of a folding edge between the upper and the lower folded sheet is cut and the folded sheet separated from the stack of fibrous material webs is deposited on the platen.

With the measures according to the invention it is possible to realize a precise leporello folding with leporello folds always lying on top of one another, that is to say lying in a vertical plane, and to achieve speeds of up to more than 30 m / min. It was even found in the embodiment of the invention according to the invention that conveying speeds of up to more than 50 or even 60 m / min can be achieved without having to accept losses in terms of the Leporello folding quality.

Figur 1

eine perspektivische Seitenansicht eines erfindungsgemäßen Antriebsmechanismus für eine Leporellofaltvorrichtung;

Figur 2

eine Seitenansicht des Antriebsmechanismus gemäß Figur 2;

Figur 3

eine Draufsicht des Antriebsmechanismus gemäß Figur 1;

Figur 4

eine Querschnittsansicht des erfindungsgemäßen Antriebsmechanismus in der Pendelmitteldurchgangsposition nach der Schnittlinie IV-IV;

Figur 5

eine Querschnittsansicht des Antriebsmechanismus gemäß Figur 4 in der rechten Pendelumkehraußenposition;

Figuren 6a - 6d

der gesamte Antriebsmechanismus in vier verschiedenen Pendelpositionen;

Figur 7

eine graphische Darstellung der Pendelantriebswinkelgeschwindigkeit anhand einer Kurvendarstellung der Winkelposition über der Zeit;

Figur 8

eine graphische Darstellung der Winkelgeschwindigkeit der angetriebenen Walze mittels einer Kurvengraphik der Winkelposition über der Zeit;

Figur 9a -9d

eine Seitenansicht der erfindungsgemäßen Leporellofaltvorrichtung in vier Betriebspositionen zur Bildung der Leporellofaltung in vier Faltschritten; und

Figur 10

perspektivische Teilansicht der erfindungsgemäßen Leporellofaltvorrichtung.

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

Figure 1

a perspective side view of a drive mechanism according to the invention for a Leporello folding device;

Figure 2

a side view of the drive mechanism according to FIG Figure 2 ;

Figure 3

a plan view of the drive mechanism according to FIG Figure 1 ;

Figure 4

a cross-sectional view of the drive mechanism according to the invention in the pendulum center passage position along the section line IV-IV;

Figure 5

a cross-sectional view of the drive mechanism according to FIG Figure 4 in the right outer pendulum reversal position;

Figures 6a-6d

the entire drive mechanism in four different pendulum positions;

Figure 7

a graphical representation of the pendulum drive angular velocity based on a graph of the angular position over time;

Figure 8

a graph of the angular velocity of the driven roller by means of a graph of the angular position versus time;

Figures 9a-9d

a side view of the Leporello folding device according to the invention in four operating positions for forming the Leporello fold in four folding steps; and

Figure 10

perspective partial view of the Leporello folding device according to the invention.

In the Figures 1 to 6 the drive mechanism according to the invention and its mode of operation are shown. The drive mechanism according to the invention is generally provided with the reference number 1.

The drive mechanism 1 serves to pull both the fibrous material web (not shown), such as the corrugated cardboard paper web, from a supply roll (not shown) and to spend the corrugated cardboard paper web in a fan-fold 3, as in the Figures 9 is indicated.

In order to provide the conveying drive for the corrugated cardboard paper web, the drive mechanism has a pair of rollers consisting of two opposing rollers 5, 7, in particular only the corrugated roller 5 being driven. The roller 7 is also driven and synchronized with the corrugated roller 5, but can also be free-running. The rollers 5, 7 define axes of rotation lying parallel to one another. 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, the support structure 11 together with the rollers 5, 7, as in FIGS Figures 4 and 5 is shown, can be pivoted and swung back and forth about a pivot axis, which in the region of a passage gap 13 is parallel to the axes of rotation of the Rolls 5, 7 lies. Like in the Figure 4 As can be seen, the corrugated cardboard paper web is oriented essentially in the vertical direction V downwards relative to a fan-fold stack tray (not shown in detail), a defined fan-fold 3 being able to be implemented by pivoting the pair of rollers 5, 7 to and fro.

The corrugated roller 5 has a circumferential outer corrugation, the corrugated contour of which is designed to complement a one-sided or both-sided wave contour of the corrugated cardboard paper web. In this way, an essentially slip-free advance of the corrugated cardboard paper web towards the fan-fold 3 through the passage gap 13 can be achieved. The corrugated drive roller 5, which is continuously driven in rotation by an electric motor not shown in detail, is used exclusively to advance the web of corrugated cardboard paper. To set the angular speed of the drive roller 5, control and regulation are provided, which are not shown in detail in the figures. As in Figure 3 As can be seen, the outer corrugation is divided into several outer corrugation sections, in particular of the same size, with adjacent outer corrugations being separated by a circumferential recess 10 into which a scraper protrudes in order to lift the web of corrugated cardboard from the drive roller 5.

The smooth roller 7 can also be continuously rotationally driven by an electric motor (not shown in greater detail) and a corresponding control and / or regulation. The smooth roller 7 serves to bring the corrugated contour of the corrugated cardboard paper web into the form-complementary engagement with the corrugated drive roller 5 and to hold it there. The surface of the smooth roller 7 can be coated with a low-friction material such as Teflon®. In operation, the smooth roller 7 and the corrugated drive roller 5 are arranged at a constant distance from one another with the formation of the predetermined passage gap 13. The passage gap 13 is dimensioned such that the web of corrugated cardboard paper is always in contact with both rollers 5, 7 when it passes through the passage gap 13.

In order to realize the fan-fold 3, the support structure 11 together with the rollers 5, 7 is pivoted back and forth about the common pendulum axis, the pendulum axis extending through the passage gap 13 at equal distances from the rollers 5, 7. The pendulum axis lies essentially in a plane defined by the corrugated cardboard paper web in the passage gap 13.

A pendulum drive 15, which is formed by an electric motor (not shown) and a pulley connecting rod drive, is provided so that the support structure 11 together with the rollers 5, 7 swivels about the pendulum axis.

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 between the opposite rollers 5, 7 in the passage gap 13.

A swivel range sector is set in such a way that the corrugated cardboard paper web moves continuously from left to right and from right to left from a fold edge formed of the fan-fold 3. The pivot sector can be greater than 90, preferably approximately 110 °.

In the interaction of the back and forth pivoting movement of the pair of rollers 5, 7 and the advance of the corrugated cardboard paper web implemented by the corrugated drive roller 5, it is possible to bring the corrugated cardboard paper web into the desired uniform fan-fold 3 in a structurally simple manner.

Subsequent to the passage gap 13, a device 17 for guided guiding of the corrugated cardboard paper web towards the fan-fold 3 is provided, which extends in the exit delivery direction A and along the entire width of the corrugated cardboard paper web. The guide device 17 comprises a base plate part 21, which has a funnel-shaped scraper 23 at the end of the passage gap, which in the area of the circumferential recess 10 clings essentially tangentially to the respective roller 5, 7 in order to lift the web of corrugated cardboard from the drive roller. The base plate part 21 comprises two parallel plates arranged at a distance, which between them defines a guide shaft 25 for the web of corrugated cardboard. The base plate part 21 is firmly attached to the support structure 11.

Furthermore, the guide device 17 comprises a sliding plate part 31 which is telescopically displaceable with respect to the base plate part 21, which is translationally displaceable back and forth over the base plate part 21 in the exit delivery direction A and which, like the base plate part 21, consists of two parallel plates arranged at a distance between define the guide shaft 25 for the corrugated cardboard paper web. The distance between the plates of the moving plate part 33 is greater, so that the moving plate part 33 can be moved translationally over the base plate part 21 to form a telescopic mechanism.

In order to set and control a defined reciprocating movement as required, a sliding block 33 is provided on the outside of the moving plate part 31, which is guided in a frame-mounted link 35 to enable the moving plate part 31 to move back and forth relative to the base plate part in a coordinated manner with respect to the pivoting position 21 to realize.

As in Figure 2 As can be seen, the displacement plate part 31 extends the guide shaft 25, as a result of which an expanded guiding property towards the fan-fold 3 is realized.

At the end of the moving plate part 31, on both sides of the respective plates, there is a smoothing device 37 in the form of a comb-shaped broom structure with opposing broom sections, as in FIG Figures 1 and 3 can be seen, arranged, which can come to an uppermost folded position of the Leporello fold 3 in a direct swipe contact, as in the Figures 9 is indicated.

The telescopic mechanism of the guide device 13 is set in such a way that the free end of the smoothing device 37 runs essentially in a horizontal plane when the guide device 17 oscillates from left to right and back to form the fan-fold 3. In this way, it is ensured that a guide-free distance between the fan-fold 3 and the drive mechanism 1 remains as short as possible and that a smoothing function exists for as long as possible on the top layer of the fan-fold 3.

As in the Figures 4 and 5 As can be seen, the displacement plate part 31 is brought into the most extended position in the pendulum reversal outer position when following the slightly curved and essentially horizontal gate 35, as in FIG Figure 5 can be seen. The most retracted position is in Figure 4 shown, namely when the exit discharge direction A coincides with a vertical V, so the pair of rollers 57 passes through the pendulum center passage position.

The setting of the length of the guide shaft 25, the distance of the free end of the guide device 17 to the fan-fold 3 and / or the distance of the free end of the guide device 17 to the passage gap 13 depends in the embodiment according to the Figures 4 and 5 from the pivot position of the pair of rollers 5, 7. It is clear that other control parameters, such as the conveying speed, can also be used to regulate the distance and regulate the length of the guide shaft. It is clear that this distance regulation can also be implemented continuously and depending on the operation, that is, without a fixed backdrop.

As in the Figures 6a to 6d As can be seen, the pulley connecting rod drive is implemented by several drive pulleys, with a motor-side drive pulley 41 driving a first pulley 45 via a connecting rod 43, which is in engagement with an output pulley 47 via the belt 49 in order to prevent the reciprocating movement of the pair of rollers 5 To realize 7.

The pendulum drive according to the Figures 6a to 6b is designed to convert a continuous rotational movement of the drive pulley 41 into a back and forth pivoting movement of the drive belt pulley 47 and thus of the pair of rollers 5, 7. The connecting rod 43 is designed to be slightly shorter than the central axis distance between the drive pulley 41 and the first belt pulley 45.

In Figure 6a the vertical pendulum center passage position is shown. In position 2 ( Figure 6b ) left pendulum reversal position is shown while Figure 3 the pendulum center passage position can be seen again. In Figure 4 is the right outer pendulum reversal position.

It was found that a uniform pendulum movement with a uniform pendulum speed often leads to a curvature and tension in the corrugated cardboard paper material to be laid for the fan-fold. In this respect, an angular speed setting for the pendulum movement with regard to the drive pulley 41 is necessary, which is shown in FIG Figure 7 is shown.

In the Figures 7 and 8 The control mechanism according to the invention will now be explained with regard to the pendulum drive angular speed and the roller angular speed of the driven roller 5, 7.

As in Figure 7 As can be seen, the angular speed of the pendulum drive is negligibly low starting from the pendulum center passage position and gradually increases and reaches the highest angular velocity in position 2. In this way it is ensured that the exit delivery direction A does not remain in the reversing position for too long, but is brought back into the passage position in an accelerated manner.

From position 2 the angular velocity decreases again and reaches a minimum at position 3 so that the pendulum center passage position is not passed through too quickly. In this way, a sufficient amount of corrugated paperboard paper web material can be made to fold. From position 3 to position 4, the angular speed increases again continuously and reaches the maximum angular speed in position 4, which decreases again towards position 1.

From this profile of the pendulum drive angular speed, especially for the drive pulley 41, it is clear that the processing of the corrugated cardboard paper material must go hand in hand, especially at the outer pendulum reversal positions, so that there should be a higher angular speed so that there is no strong tension or warping of the corrugated cardboard paper material there.

In Figure 8 the angular velocity profile for the rotating rollers 5, 7 is shown. Here, too, the angular speed is set depending on the position of the pendulum movement.

As in Figure 8 As can be seen, the angular velocity is highest in positions 1, so that the corrugated cardboard paper material is conveyed the fastest towards the fan-fold fold in order to satisfy a higher material requirement. 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 with comparing the Figures 7 and 8 As can be seen, the angular position profiles, in particular the angular velocity profiles, run in opposite directions and are coordinated to the extent that less corrugated cardboard paper web material is made available in positions 2 and 4 and the positions are left more quickly, with more corrugated cardboard paper web material being made available in positions 1 and 3 and the positions are left more slowly. It turned out that with the above Angular speed settings a precise and uniform Leporello folding can be achieved even with regard to higher conveyor speeds, which can be over 40 or 50 m / min.

In order to form irreversible side folds in the corrugated cardboard paper web, as in the Figures 9a to 9d and 10 As can be seen, a pair of left and right low-pressure rams 51, 53 is provided for a leporello folding device 50 according to the invention, which can be shifted towards and away from the leporello fold 3 essentially in the vertical direction V. The press-down rams 51, 53 can extend over the entire width of the web of corrugated cardboard. The press-down rams 51, 53 are operated by an independent drive 55, which provides a continuous rotary movement of a drive disk in only one direction of rotation. A multi-joint gearing is used to convert the rotary movement of the drive pulley into a vertical up and down movement of the press-down rams 51, 53. The press-down ram 51, 53 has a pressure engagement position in which the fan-fold is depressed for folding, and a release position in which the press-down ram 51, 53 releases the fan-fold 3.

As in Figure 10 As can be seen, the low-pressure ram comprises a comb structure 61 made up of several blunt ram prongs 63 arranged in a row, with adjacent ram prongs 63 being separated from one another at regular intervals by recesses.

Furthermore, the Leporello folding device has a retaining device in the form of a pair of left and right retaining feet 67, 69, each of which has a substantially horizontally extending finger arrangement. The horizontal finger arrangement is dimensioned in such a way that it can move into and out of the recesses in the comb structure 61 of the press-down rams 51, 53.

The restraint device is connected to a drive device (not shown in more detail) which enables the respective restraint foot to be pivoted in and out substantially horizontally. The retaining foot is dimensioned in such a way that it partially protrudes beyond the Leporello fold edge. The purpose of the retaining device is to prevent the fan-fold folding from unfolding when the press-down ram 51, 53 moves away from the respective side of the fan-fold. The restraint has a Active position in which it prevents the fan-fold 3 from unfolding, and a passive position in which it releases the fan-fold 3.

The press-down stamps and the retaining device can be structurally coordinated with one another in such a way that they come into contact with the fan-fold fold in the width direction of the fan-fold fold essentially at the same position adjacent to the respective fold. The press-down rams and the retaining device have an axially symmetrical structure to a vertical axis V.

As in the Figures 9a to 9d As can be seen, both the restraint device and the low-pressure device each have their own kinematics of travel that are coordinated with one another. In principle, the respective left or right press-down ram should be moved into the release position when a respective left or right retaining foot has assumed the active position. If a respective left or right press-down ram is still in the pressure engagement position, a respective left or right retaining foot moves into the active position. At any time when the fan-fold 3 is being laid, at least one of the four left and right retaining feet and press-down rams is in the active or pressure engagement position.

In Figure 9a the guide device 17 is in the process of pulling the corrugated cardboard paper web from left to right from the folded edge that has just been implemented, while at the same time the coating device 37 smooths the layer underneath and the left retaining foot 69 keeps the fan-fold 3 stable. The left press-down ram 53 is just about to press down on the fan-fold fold in order to apply a folding force to it and thereby to introduce an irreversible fold in the web of corrugated cardboard. Before the press-down ram exerts a pressing force in its pressure engagement position, as shown in FIG Figure 9b is shown, the retaining foot 69 must first be pivoted out of its active position. In Figure 9b the outlet delivery direction A is exactly in the vertical V, that is, in the pendulum center passage position, the left press-down ram 53 communicating the pressing force of the fan-fold 3 in its pressure engagement position. Then there is no need for the left retaining foot 69 to be in the active position and pivoted out. In order to end the upper layer of the fan-fold fold, the right press-down ram 51 has reached the release position, the right retaining foot 67 preventing the fan-fold fold from being opened therein.

Due to the flat shape of the horizontal finger arrangement and its external attachment, the upper layer of the fan-fold 3 can easily be placed further on the finger arrangement without the right retaining foot 67 having to be moved into the passive position, which is shown in FIG Figure 9c is shown. As soon as the guide device has moved somewhat away from the fold edge, the right-hand press-down ram 51 is brought into the pressure-engagement position in order to produce the fold. The right retaining foot 67 can remain in the active position, and the left press-down ram 53 can be brought to the release position, while the left retaining foot is still holding down the fan-fold 3.

List of reference symbols

1

Drive mechanism

3

Leporello folding

5.7

Rollers

9

External corrugation

10

Circumferential recess

11

Support structure

13

Passage gap

15th

Pendulum drive

17th

Facility

21st

Base plate part

23

Scraper

25th

Guide shaft

27

Guardrail

31

Travel plate part

33

Sliding block

35

Backdrop

37

Coater

41

Drive pulley

43

connecting rod

45

Pulley

47

Output pulley

49

belt

51.53

Press-down ram

55

drive

61

Comb structure

67, 69

Hold-down foot

A.

Exit delivery direction

V

vertical

H

horizontal

Claims (15)

1. A drive mechanism (1) for a device for placing an in particular unfolded fiber material web, in particular a paper web or a corrugated paper web, such as a corrugated board web, into a Leporello folding (3), comprising a pivotably mounted pair of opposing rollers (5, 7), which form a through gap (13) for the fiber material web, and can be turned in particular for conveying the fiber material web through the through gap (13), and a drive (15) for pivoting the roller pair (5, 7), wherein an outlet dispensing direction (A) defined by the through gap (13) swings back and forth around a vertical (V) in the pivoting process, wherein a device (17) that oscillates back and forth with the roller pair (5, 7) for directedly guiding the fiber material web toward the Leporello folding (3) is arranged downstream from the through gap (13) in terms of conveying flow, characterized by a distance adjuster, in particular regulator, which adjusts or regulates a distance in the outlet dispensing direction (A) between the guiding device (17) and the through gap (13).
2. The drive mechanism (1) according to claim 1, characterized in that the guiding device (17) has an entraining member, in particular two entraining plates (37) or rods (27) lying opposite each other, in particular arranged parallel to each other, which limits a receptacle for the fiber material web exiting the through gap (13) in both oscillating directions in such a way that the fiber material web is carried along by the receptacle in the respective oscillating direction during the conveying process, wherein in particular the entraining member is configured to hold its free dispensing end essentially on a horizontal (H) and/or in a horizontal plane during the back and forth movement, and/or a length of the entraining member is preferably continuously adjustable in the outlet dispensing direction (A), in particular during the back and forth movement, so that preferably a free end of the entraining member essentially runs on a horizontal (H) or a horizontal plane during the back and forth movement, and/or so that preferably an in particular vertical distance of a free end of the entraining member to an upper folded layer of the Leporello folding (3) essentially remains constant.
3. The drive mechanism (1) according to claim 1 or 2, characterized in that the distance adjuster adjusts or regulates the distance as a function of a pivoting position of the outlet dispensing direction (A) and/or a conveying rate of the fiber material web, preferably in such a way that the distance is maximized given an oscillating outer reversal position and/or minimized given an oscillating central through position.
4. The drive mechanism (1) according to one of the preceding claims, characterized in that the guiding device (17) has a guiding shaft (25) preferably extending in the outlet dispensing direction (A), in particular elongating the through gap (13) and/or having a constant width in the outlet dispensing direction (A), wherein in particular the length of the guiding shaft (25) in the outlet dispensing direction (A) can preferably be adjusted from the through gap (13) toward a free end of the guiding device (17), wherein in particular the length to be adjusted depends on the oscillating position and/or a conveying rate of the fiber material web, wherein a stripper (23) is fixedly secured on the side of the guiding shaft (25) adjacent to the through gap (13), and in particular abuts against the roller pair (5, 7) without contact and/or tangentially.
5. The drive mechanism (1) according to one of the preceding claims, characterized in that the guiding device (17) has a telescoping mechanism with a base part (21) immovably connected with the roller pair (5, 7) and a traversing part (31) that can be moved linearly back and forth thereto, in particular in the outlet dispensing direction (A), wherein in particular an exiting and entering movement of the traversing part (31) is determined by means of an in particular arc-shaped slide (35), which is immovable, in particular fixedly secured to a bearer frame of the device, and/or into which a slide block (33) fixedly secured to the traversing part (31) engages, so that the extending part (31) is moved to the most extended position in particular in both oscillating reversal positions, and/or the traversing part (31) is moved to the most retracted position in the oscillating central through position, wherein in particular the base part (21) is guided by an additional, in particular linear slide, which is immovable, in particular fixedly secured to a bearing frame of the device, and/or into which a slide block (33) fixedly secured to the base part (21) engages.
6. The drive mechanism (1) according to one of the preceding claims, characterized in that a flexible device (37), in particular a broom with brushes extending essentially parallel to the outlet dispensing direction, is arranged at one end of the guiding device (17), in particular of the extending part (31), for smoothing a top position of the Leporello folding (3).
7. The drive mechanism (1) according to one of the preceding claims, further comprising a pivoting drive (15), with which the roller pair can be pivoted, so that an outlet dispensing direction defined by the through gap preferably oscillates back and forth around a vertical, characterized in that the pivoting drive (15) is coupled with a device for operatively adjusting, in particular regulating, the oscillating drive angular velocity for the roller pair, wherein the adjusting device is configured to adjust the oscillating drive angular velocity as a function of a pivoting position of the outlet dispensing direction (A), in particular in such a way as to adjust a higher drive angular velocity in particular of a rotating drive disk (41) of the pivoting drive (15), the highest drive angular velocity relative to the back and forth oscillation, in the area of the oscillating outer reversal position, in particular when entering into the oscillating outer reversal position and exiting the oscillating outer reversal position, and/or that a lower drive angular velocity, in particular the lowest drive angular velocity relative to the back and forth oscillation, is adjusted in the area of the oscillating central through position, in particular while passing through the oscillating central through position.
8. The drive mechanism (1) according to one of the preceding claims, further comprising a roller drive, which rotationally drives at least one of the two rollers (5, 7) for conveying the fiber material web through the through gap toward the Leporello folding (3), characterized in that the roller drive is operatively coupled with a controller and/or regulator for an angular velocity of the at least one driven roller, wherein the controller and/or regulator is configured to adjust the angular velocity as a function of a pivoting position of the outlet dispensing direction (A), in particular in such a way that the angular velocity of the driven roller is smaller in the area of an oscillating outer reversal position, in particular the lowest relative to the back and forth oscillation, in particular when entering into the oscillating outer reversal position and exiting the latter, and/or that the angular velocity of the driven roller is larger in the area of the oscillating central through position, in particular the largest relative to the back and forth oscillation.
9. A device for placing an in particular unfolded fiber material web, in particular a paper web or a corrugated paper web, such as a corrugated board web, into a Leporello folding (3), comprising a tray, on which a fiber material web stack placed for Leporello folding (3) is combined in particular for its continued transport away from the device, and a Leporello folding mechanism, which brings the fiber material web into a Leporello folding (3), and a drive mechanism designed according to one of the preceding claims, characterized by a device (51, 53) for depressing the Leporello folding in particular adjacent to its respective folding edge, wherein the depressing device (51, 53) can be moved in particular essentially in a vertical direction (V) between a pressure engaging position, in which the depressing device (51, 53) depresses the Leporello folding (3) for folding purposes, and a release position, in which the depressing device (51, 53) releases the Leporello folding (3), and a restraining device (67, 69), which at least temporarily prevents the Leporello folding (3) from unfolding owing to its elastic restoring forces when the depressing device (51, 53) is in the release position.
10. The device according to claim 9, characterized in that the restraining device (67, 69) can be moved between an active position, in which the restraining device (67, 69) prevents the Leporello folding (3) from unfolding, and a passive position, in which the restraining device (67, 69) releases the Leporello folding (3).
11. The device according to claim 9 or 10, characterized in that the depressing device (51, 53) as well as the restraining device (67, 69) are structurally tailored to each other in such a way as to engage with the Leporello folding (3) in the width direction of the Leporello folding (3) essentially at the same location adjacent to the respective fold.
12. The device according to one of claims 9 to 11, characterized in that the depressing device (51, 53) has a comb structure (61), which is formed by pressure prongs that come into pressure contact with the Leporello folding (3) and gaps between the pressure prongs, and the restraining device has a comb assembly formed by restraining prongs that comb into restraining contact with the Leporello folding (3) and recesses between the restraining prongs, wherein in particular the restraining prongs each have an elongation to form a restraining contact surface, wherein in particular the comb structure (61) and the comb assembly are configured in such a way that they can mesh with each other, wherein in particular the elongation is dimensioned in such a way in the active position as to protrude from the Leporello folding (3) in the width direction laterally over its respective fold.
13. The device according to one of claims 9 to 12, characterized in that the depressing device (51, 53) has an arrangement that is axially symmetrical in the width direction and comprised of a left and right depressing stamp (51, 53), and the restraining device has an arrangement that is axially symmetrical in the width direction and comprised of a left and right restraining arm or foot, and the restraining device has an arrangement that is axially symmetrical in the width direction, in particular relative to a central axis of the Leporello folding, and comprised of a left and right restraining arm or foot, in particular for alternately preventing the Leporello folding from unfolding.
14. The device according to one of claims 9 to 13, characterized in that automated traversing devices of the restraining device (67, 69) and the depressing device (51, 53) are tailored to each other in such a way that a respective left or right depressing stamp (51, 53) travels into the release position when a respective left or right restraining arm (67, 69) has assumed the active position.
15. The device according to one of claims 9 to 14, characterized in that a respective left or right restraining arm travels into the active position if a respective left or right depressing stamp is still in the pressure engaged position, and that at any point while placing the Leporello folding, at least one of the four left and right restraining arms and depressing stamps is in the active position or pressure engaged position.

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