EP0270943B1 - Method and device for forming piles from flat articles (sheets) - Google Patents

Method and device for forming piles from flat articles (sheets) Download PDF

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Publication number
EP0270943B1
EP0270943B1 EP87117539A EP87117539A EP0270943B1 EP 0270943 B1 EP0270943 B1 EP 0270943B1 EP 87117539 A EP87117539 A EP 87117539A EP 87117539 A EP87117539 A EP 87117539A EP 0270943 B1 EP0270943 B1 EP 0270943B1
Authority
EP
European Patent Office
Prior art keywords
stack
away
conveying
belts
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87117539A
Other languages
German (de)
French (fr)
Other versions
EP0270943A1 (en
Inventor
Alfred Besemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ECH Will GmbH and Co
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ECH Will GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by ECH Will GmbH and Co filed Critical ECH Will GmbH and Co
Publication of EP0270943A1 publication Critical patent/EP0270943A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/30—Arrangements for removing completed piles
    • B65H31/3054—Arrangements for removing completed piles by moving the surface supporting the lowermost article of the pile, e.g. by using belts or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/30—Arrangements for removing completed piles
    • B65H31/3081—Arrangements for removing completed piles by acting on edge of the pile for moving it along a surface, e.g. by pushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/32—Auxiliary devices for receiving articles during removal of a completed pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/60—Coupling, adapter or locking means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/12—Means using fluid made only for exhausting gaseous medium producing gas blast
    • B65H2406/122—Nozzles

Definitions

  • the invention relates to a method for forming stacks of sheet material (sheets) at a collection point and for conveying away the stacks, which are supported on a lower surface and are held on a surface by a holding element.
  • the invention also relates to an arrangement for forming and conveying stacks of sheet material (sheets) with a collecting device and a conveyor which has a movable support for the stack and a movable holding element resting on the surface of the stack.
  • Sheet-shaped material is understood to mean single sheets or single sheets of paper, film, plastic, which have a flat shape.
  • the term “stack” means collections of sheets lying one above the other. So-called “layers” made up of relatively few sheets lying one above the other should also fall under the collective term “stack”.
  • the object on which the invention is based is to ensure a quick and safe removal of stacks from an accumulation point without the accumulation process being disturbed.
  • this object is achieved in that a further stack arranged above the stack is also held by a further holding element which, after the stack has been removed, sinks downward with the further stack and holds the surface thereof when the further stack is removed.
  • the associated holding element is raised by at least one stack height and brought into the separation position, in which it separates the further stack from sheets that have accumulated further to form a new stack.
  • the further jaw serves as a separating jaw for the following stack, hereinafter referred to as "further stack”.
  • further stack After removal of the first stack, the further jaw then serves to hold the removal of the further stack.
  • a cheek after exercising its holding function, is transferred into a position in which it functions as a separator for the exercises another stack. The two jaws then alternate in their holding and separating functions, a jaw advantageously not changing its position with respect to the stack below it until it detaches from it during removal.
  • a stack to be conveyed is supported at least on the largest part of its lower surface, while it is only held on a relatively small part of its surface.
  • the support can cover the entire bottom surface of the stack.
  • the stack is advantageously held in an edge zone of its surface which lies in the conveying direction.
  • the holding surface holding the stack on its surface advantageously consists of a jaw which, after the stack has been formed, separates it from sheets accumulated above it.
  • the bottom surface of a stack can be supported in the removal of belts, which can be guided over rollers, which are mounted in a preferably horizontally movable carriage.
  • the tapes can then advantageously be removed first with the stack, wherein they are not driven relative to the carriage. Only when the stack is sufficiently far away from its removal position can they be driven according to a further development of the invention in order to also remove the stack from the belts.
  • a particularly advantageous development of the invention which is generally applicable for the promotion of stacks of sheets and which therefore has independent inventive content, consists in the fact that the belts stand still relative to a carriage carrying them until the stacks are first removed from the surface of the stack moving cheek has released from the stack, and that the belts are then driven with the stack relative to the carriage in the conveying direction.
  • this sub-problem is solved in that the carriage with the belts guided over rollers is moved to the collecting station while the belts are being held, so that belt sections without relative movements in the conveying direction with respect to the lower surface of the further stack on the lower surface thereof Create continuously. Damage to this lower surface is thus reliably avoided.
  • the further stack is supported at least on the largest part of its lower surface while it is lowered into the removal position.
  • This can be lowered Table are used, from the surface of which compressed air flows when a relative movement between the table and the stack is to take place in or parallel to the discharge direction.
  • the compressed air reduces the friction between the table surface and the lower surface of the stack so much that impairment of the lower surface during a relative movement is practically impossible.
  • the table and belts can be driven synchronously so that the belts support the stack being removed, while the table supports the further stack in the area released by the stack underneath.
  • compressed air can be blown in between the stacks in order to reduce the friction.
  • the further stack located above the stack, which is in the removal position can be held by at least one separating finger until it is lowered into the removal position. Compressed air can advantageously be blown from this separating finger in order to better separate the stacks or to reduce the friction between them.
  • a further improvement in the removal of the stack from its removal position is obtained by pushing the stack on a boundary surface facing away from the conveying direction.
  • the arrangement mentioned at the outset which is used in particular to carry out the method according to the invention, is characterized in that a further holding element is provided for a further stack arranged above the stack, which holding element is provided with a lowering device for lowering the further stack and the further holding element Removal of the stack located in the removal position is provided.
  • the invention has several advantages:
  • the stack to be removed is held securely during removal. Its sheets can hardly move even with a larger stack height, so that there is no fear of slipping of sheets or sheet layers within the stack.
  • the special configurations of the invention (blown air between the stacks. Support by air table) reliably prevent damage to the bottom or surface of the stacks when the bottom stack is being removed.
  • the speed with which the stacks can be removed is increased in addition to safety. Due to the specific design of the trolley and the belt drive, in which when a stack is removed, its speed does not change until it is delivered to a conveyor, i.e. its speed is at least largely independent of the speed changes of the trolley carrying the belts, only work at high removal speeds controllable acceleration and deceleration forces onto the stack, which reduces the risk of slipping.
  • a stack of sheets 1 is located at a collecting station or collecting point SS in its removal position AP, in which it is ready for removal in the conveying direction FR. It rests with its lower surface 2 on belts 3 (only one visible) arranged one behind the other in the plane of the drawing, which form a base and are guided over rollers 4 ... 8.
  • the rollers 4 and 6 are rotatably mounted in a carriage 9, the roller 4 being fixable by an electrically controllable brake 10.
  • the rollers 6, 7 and 8 are mounted in a stationary manner, the roller 8 being drivable by a drive in the form of an electric motor 11 and being fixable by an electrically controllable brake 12.
  • a drive for the carriage 9 in the form of an electric motor 13 is guided with a spindle 14 through a spindle nut 16 fastened to the carriage, so that it can drive the carriage in the conveying direction FR or in the opposite direction RF, depending on the direction of rotation Rollers 17 on a tread 18.
  • Guide surfaces for the stack 1 are designated 19, 21 and 22.
  • a conveyor belt 23 in a transfer position ÜP serves to remove the stack 1 transferred by the carriage 9.
  • the surface of such known air tables has bores 29 which are closed by spring-loaded balls, not shown. If these balls are under the winding of a load, e.g. B. a stack of sheets, depressed, compressed air flows from the holes, which forms an air film that reduces the friction between the table surface and the bottom surface of the stack.
  • the air table is connected to the carriage 9 so that it runs along with the carriage in the conveying direction FR, with rollers 31 of the air table running on rails 32.
  • the air table can be displaced vertically relative to the carriage 9 by means of suitable guides, designated 35, when a lowering device 33, which can also function as a lifting device, lowers or raises the rails 32.
  • the lowering device is designed as lowerable and liftable scissors 34 with the legs 36 and 37.
  • the legs 36 are rotatably mounted on the rails 32 by means of joints 38 and are guided in sliding guides 41 on a bottom surface 39.
  • the legs 37 are rotatably mounted on the bottom surface 39 by means of joints 42 and are mounted on the rails 32 by means of sliding guides 43 so that they can be moved.
  • a drive in the form of an electric motor 44 a spindle nut 46 and a spindle 47, the rails 32 and with them the air table 26 can be raised and lowered by approximately a stack height.
  • the jaw 53 rests with its holding surfaces on the surface 55 of the stack 1 in an edge zone RZ located in the conveying direction FR, in which it has a separating function as shown in FIG.
  • the Parting fingers 52 are connected via a flexible line 56 to a compressed air source 57, so that they can blow compressed air from their interior through ducts between stacks 1 and 51, which reduces the adhesion and friction between these stacks.
  • the forks 54 of the jaw 53 of which FIG. 7 shows details, also have a flexible connection 81, shown in FIG.
  • the forks 54 of the jaw 53 are connected to a common pneumatic drive 58 for movement in the horizontal direction and to a pneumatic drive 59 for movement in the vertical direction.
  • the separating fingers 52 have a common pneumatic drive 62 for movement in the horizontal direction.
  • the further jaw 63 On the further stack 51 there is a further jaw 63 in a position in which it performs a separating function, wherein it separates the further stack 51 from a new stack of sheets 61 which is just being formed.
  • the further jaw 63 also consists of forks 64 which are connected to a common pneumatic drive 66 for movement in the horizontal direction and to a common pneumatic drive 67 for movement in the vertical direction.
  • the jaw 63 like the jaw 53, is connected to a compressed air source 82 via an air connection 81 shown in FIG. 7, so that compressed air can be blown out of the jaw when it is in its separation position.
  • the pneumatic drives 58, 59, 62, 66 and 67 receive their compressed air for the back and forth movements to be initiated by them via schematically indicated air lines 58a, 58b or 59a, 59b or 62a, 62b or 66a, 66b or 67a, 67b from a compressed air transmitter 68, the outputs of which are controlled by a control arrangement 69.
  • the control arrangement also controls the electric drive motors 11, 13 and 44 via schematically indicated lines 11a or 13a or 44a and the controllable brakes 10 and 12 via schematically indicated control lines 10a or 12a.
  • the above-mentioned pneumatic and electric drives are controlled as a function of the machine cycles in which sheets 71 are fed to the collecting station SS from a conveyor belt 74 guided over rollers 72 and 73.
  • the leaves are e.g. B. from a rotary cutter, not shown, from a continuous web of material, for. B. a paper web, cut off and are collected into a new stack 61 over the other jaw 63 in its separating position.
  • 75 and 76 so-called plates are referred to, which are usually designed as sheets that are vibrated by a vibrator and have the task of aligning the sheets of the stack after accumulation, so that the boundary surfaces are as smooth as possible.
  • 77 is a slide which has the task of supporting the removal of the stack 1 by pressing on the surface 78 of the stack 1.
  • FIG. 6 shows a plan view of the forks 64 of the further jaw 63 resting on the further stack 51, of the separating fingers 52 and of the forks 54 of the jaw 53, approximately in the position in FIG. 4. The flowing air is also indicated.
  • FIG. 7 shows an enlarged side view of a jaw 53, 63 with an air outlet 80, an air channel 79, a flexible line 81 (for example a hose line) and a compressed air source 82.
  • FIGS. 1 to 5 illustrate the movement sequences.
  • FIGS. 2 to 5 omit the pneumatic lines from the compressed air transmitter 68 to the pneumatic drives and the electrical lines from the control arrangement 69 to the electrical drives and the controllable brakes.
  • the stack 1 to be removed is in its removal position AP, from which it, resting on the belts 3, is conveyed by means of the carriage 9 to its transfer position UP and transferred there to the removal belt 23 and transferred for further processing, e.g. B. for packaging is removed.
  • the separating fingers 52 and the jaw 53 are located in an edge zone RZ above the stack 1 in a separating position in which they perform their separating function in an intermediate space ZW between the stack 1 and a further stack 51 which has the same height as stack 1 protrude. Compressed air flows from the separating fingers 52 and the forks 54 of the jaw 53 into the intermediate space ZW to reduce the friction between the lower surface of the stack 51 and the surface 55 of the stack 1, which also makes it easier to separate the two stacks from one another, which will be described later.
  • the forks 64 of the further jaw 63 are in a separating position in which they protrude into the intermediate space ZW between the further stack 51 and a new stack 61 that is being formed in order to perform their separating function; Compressed air is also blown into this space to reduce friction and improve separation.
  • the electric motor 13 of the carriage 9 receives a control signal from the control arrangement 69 via line 13a so that it starts up and sets the carriage in motion in the removal direction FR.
  • the pneumatic drive 58 of the jaw 53 receives compressed air via line 58a from the compressed air generator 68, so that the jaw 53 is moved synchronously with the carriage 9 in the FR direction, resting on the edge zone RZ of the stacking surface 55 and thus performing its holding function.
  • the brake 10 of the roller 4 is tightened so that the belts 3 with the stack 1 are still at rest relative to the carriage 9.
  • the brake 12 receives a control signal for release from the control arrangement 69 via line 12a; at the same time, the electric motor 11 receives a control signal via line 11a, so that it starts up and sets the roller 8 under tension.
  • the drive for the belts 3 can also be designed such that the electric motor 11 always runs through and the transmission of its torque to the belts 3 only takes place via the controllable brake 12.
  • the speed of the electric motor 11 is selected so that the roller 8 has a slightly higher peripheral speed than the speed of the carriage 9 in the FR direction, so that the upper strands of the belts 3 are always taut.
  • the jaw 53 thus acts as a holding jaw in the manner described above, so that the stack 1 can be safely detached from the stack 51 above and accelerated.
  • the separation is supported by the compressed air from the separation fingers 52 and possibly from the jaw 53.
  • the removal of the stack 1 is supported by the slide 77, which presses on the stacking surface 78.
  • the air table 26 according to FIG. 2 increasingly passes under the further stack 51, air flowing out of the bores 29 of the covered surfaces reduces the friction between the table surface and the stacking surface.
  • Figure 3 shows that the jaw 53 is lifted by the pneumatic drive 67 from the surface 55 of the stack 1 after the start of the conveyance, since its holding function is only required during the beginning and the first phase of the conveyance. After a stroke, it is conveyed back by approximately one stack height from the drive 58 in the horizontal direction to the collecting station SS and conveyed over the edge zone RZ of the new stack 61 (FIGS. 4 and 5) as soon as it has reached its prescribed size. In this position, the jaw 53 performs a separating function by separating the new stack 61 from further sheets 71 fed from above to the collecting station SS. The separation function is supported by the compressed air flowing out of the forks 54 of the jaw 53.
  • the brake 10 is released by a control signal via line 10a, so that the belts 3 can now carry out a relative movement to the carriage 9 in the discharge direction FR, the carriage moving further from the electric motor 13 in the direction FR is moved.
  • the speed of the tapes can be controlled so that they are in space, for. B. based on the tread 18, is substantially constant regardless of the speed at which the carriage is moved to the transfer position ÜP.
  • the belts 3 can push the stack 1 onto the conveyor belt 23 practically without changes in speed over the guide surfaces 21 and 22, which then removes it for further processing.
  • the further stack 51 which is now completely on the air table 26, must be lowered into the removal position AP, for which purpose the electric drive motor 44 is switched on.
  • This motor rotates the spindle 47, which pulls the scissors 34 downward by the height of the further stack 51, as a result of which the latter reaches the discharge position AP shown in FIG. 4.
  • the separating fingers 52 are removed by their pneumatic drive 62, which receives compressed air via line 62a, from the intermediate space ZW between the stacks until the further stack 51 has reached its removal position AP. In this position, the pneumatic drive 62 moves the separating fingers 52 back into the position between the stacks as shown in FIG.
  • the pneumatic drive 67 of the further jaw 63 lowers it in synchronism with the one below another stack 51, so that the jaw 63 maintains its separating function until it performs its holding function when the further stack 51 is subsequently removed.
  • 4 has left the belts 3 of the carriage 7, the carriage 9 is moved back in the opposite direction RF by the electric motor 13, which receives a corresponding control signal via line 13a.
  • the roller 8 is fixed via the controllable brake 12, which receives a control signal via line 12a, while the brake 10 remains open.
  • belt sections of the belts 3 lie in succession from below against the lower surface of the further stack 51 without executing a relative movement in the opposite direction RF, so that the risk of damage to the lower surface is excluded.
  • the jaws 53 and 63 perform their separating and holding functions one after the other and alternate in the process. It is particularly advantageous that the jaws 53, 63 do not change their relative position with respect to the edge zones RZ of the stack, neither in their separating nor in their holding function, which has a favorable influence on the movement sequences of the stack and also permits higher speeds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
  • Forming Counted Batches (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Bilden von Stapeln aus blattförmigem Material (Blättern) an einer Sammelstelle und zum Abfördern der Stapel, die dabei an einer Unterfläche unterstützt und an einer Oberfläche von einem Halteelement gehalten werden.
Die Erfindung betrifft außerdem eine Anordnung zum Bilden und Abfördern von Stapeln aus blattförmigem Material (Blättern) mit einer Sammelvorrichtung und einem Abförderer, der eine bewegbare Unterlage für den Stapel und ein auf der Oberfläche des Stapels aufliegendes bewegbares Halteelement aufweist.The invention relates to a method for forming stacks of sheet material (sheets) at a collection point and for conveying away the stacks, which are supported on a lower surface and are held on a surface by a holding element.
The invention also relates to an arrangement for forming and conveying stacks of sheet material (sheets) with a collecting device and a conveyor which has a movable support for the stack and a movable holding element resting on the surface of the stack.

Unter blattförmigem Material (Blätter) werden Einzelblätter oder Einzelbogen aus Papier, Folie, Kunststoff verstanden, die flächige Form haben.
Unter dem Begriff "Stapel" werden Ansammlungen übereinanderliegender Blätter verstanden. Auch sogenannte "Lagen" aus relativ wenigen übereinanderliegenden Blättern sollen unter den Sammelbegriff "Stapel" fallen.Sheet-shaped material (sheets) is understood to mean single sheets or single sheets of paper, film, plastic, which have a flat shape.
The term "stack" means collections of sheets lying one above the other. So-called "layers" made up of relatively few sheets lying one above the other should also fall under the collective term "stack".

In der papierverarbeitenden Industrie werden an sogenannten Sammelstationen einzelne Blätter, die zum Beispiel von einer Schneideinrichtung durch Abschneiden von einer laufenden Bahn gebildet werden, fortlaufend zu Lagen oder Stapeln übereinandergelegt; während dieses Ansammelns müssen Stapel definierter Blätterzahl zur Weiterverarbeitung von der Sammelstelle abgefördert werden.
Durch die DE-A-30 46 107 ist eine Transporteinrichtung für Bogenstapel bekanntgeworden, bei der ein durch Übereinanderlegen von einzelnen Bogen gebildeter Stapel von der Zufuhr weiterer Bogen durch eine Sperreinrichtung abgetrennt wird. Danach greifen Greifer den gebildeten Stapel und ziehen ihn in horizontaler Richtung ab. Während dieser Förderbewegung wird über dem abgeförderten Stapel ein weiterer Bogenstapel angesammelt, abgesenkt, von den gleichen Greifern erfaßt und abgezogen usw.In the paper processing industry, individual sheets, which are formed, for example, by a cutting device by cutting off a running web, are continuously stacked on top of one another in layers or stacks; during this accumulation, stacks of a defined number of sheets must be removed from the collection point for further processing.
From DE-A-30 46 107 a transport device for sheet stacks has become known, in which a stack formed by superimposing individual sheets from the feed another sheet is separated by a locking device. Then grippers grab the stack formed and pull it off in the horizontal direction. During this conveying movement, a further stack of sheets is collected, lowered, gripped by the same grippers and pulled off, etc.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, eine schnelle und sichere Abförderung von Stapeln aus einer Ansammelstelle zu gewährleisten, ohne daß der Ansammelprozeß gestört wird.The object on which the invention is based is to ensure a quick and safe removal of stacks from an accumulation point without the accumulation process being disturbed.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß ein über dem Stapel angeordneter weiterer Stapel ebenfalls von einem weiteren Halteelement gehalten wird, das nach Abförderung des Stapels mit dem weiteren Stapel nach unten sinkt und beim Abfördern des weiteren Stapels dessen Oberfläche hält.According to the invention, this object is achieved in that a further stack arranged above the stack is also held by a further holding element which, after the stack has been removed, sinks downward with the further stack and holds the surface thereof when the further stack is removed.

In weiterer Ausgestaltung der Erfindung wird nach Abfördern des Stapels das zugehörige Halteelement um mindestens eine Stapelhöhe angehoben und in Trennposition gebracht, in der es den weiteren Stapel von weiter zu einem neuen Stapel angesammelten Blättern trennt.
Während somit eine Backe den abzufördernden Stapel bei seiner Abförderung in der vorbeschriebenen Weise, vorteilhaft in einer Randzone, hält, dient die weitere Backe als Trennbacke für den folgenden Stapel, im folgenden "weiterer Stapel" genannt. Nach Abförderung des ersten Stapels dient dann die weitere Backe zum Halten bei der Abförderung des weiteren Stapels. Gemäß einer bevorzugten Weiterbildung der Erfindung wird eine Backe nach Ausüben ihrer Haltefunktion in eine Lage überführt, in der sie eine Trennfunktion für den weiteren Stapel ausübt. Die beiden Backen wechseln sich in ihrer Halte- und Traennfunktion dann ab, wobei in besonders vorteilhafter Weise eine Backe ihre Lage bezüglich des unter ihr befindlichen Stapels nicht ändert, bis sie sich von ihm während der Abförderung löst.In a further embodiment of the invention, after the stack has been removed, the associated holding element is raised by at least one stack height and brought into the separation position, in which it separates the further stack from sheets that have accumulated further to form a new stack.
Thus, while one jaw holds the stack to be removed when it is removed in the manner described above, advantageously in an edge zone, the further jaw serves as a separating jaw for the following stack, hereinafter referred to as "further stack". After removal of the first stack, the further jaw then serves to hold the removal of the further stack. According to a preferred development of the invention, a cheek, after exercising its holding function, is transferred into a position in which it functions as a separator for the exercises another stack. The two jaws then alternate in their holding and separating functions, a jaw advantageously not changing its position with respect to the stack below it until it detaches from it during removal.

Nach einer vorteilhaften Weiterbildung er Erfindung wird ein abzufördernder Stapel zumindest auf dem größten Teil seiner Unterfläche unterstützt, während er nur auf einem relativ kleinen Teil seiner Oberfläche gehalten wird. Die Unterstützung kann die gesamte Unterfläche des Stapels umfassen. Vorteilhaft wird der Stapel gemäß einer Weiterbildung der Erfindung in einer Randzone seiner Oberfläche gehalten, die in Förderrichtung liegt. Die den Stapel an seiner Oberfläche haltende Haltefläche besteht vorteilhaft aus einer Backe, die nach dem Bilden des Stapels diesen von darüber angesammelten Blättern trennt.
Die Unterfläche eines Stapels kann gemäß einer Weiterbildung der Erfindung beim Abfördern von Bändern unterstützt werden, die über Rollen geführt sein können, die in einem vorzugsweise horizontal bewegbaren Wagen gelagert sind. Die Bänder können dann vorteilhaft zunächst mit dem Stapel abgefördert werden, wobei sie nicht relativ zu dem Wagen angetrieben sind. Erst wenn der Stapel aus seiner Abförderposition genügend weit entfernt ist, können sie gemäß einer Weiterbildung der Erfindung angetrieben sein, um den Stapel auch von den Bändern zu entfernen.
Eine besonders vorteilhafte Weiterbildung der Erfindung, die allgemein für die Förderung von Blätterstapeln anwendbar ist und der daher selbständiger erfinderischer Gehalt zukommt, besteht darin, daß die Bänder beim Abfördern des Stapels relativ zu einem sie tragenden Wagen stillstehen, bis die zunächst auf der Oberfläche des Stapels mitbewegte Backe sich von dem Stapel gelöst hat, und daß danach die Bänder mit dem Stapel relativ zu dem Wagen in Förderrichtung angetrieben werden.
Bei dieser Weiterbildung wird vermieden, daß die Stapel zunächst mit dem Wagen stillgesetzt und anschließend durch die Bänder wieder beschleunigt werden müssen, wodurch wegen der beschränkten Verzögerungs- und Beschleunigungswerte (Verrutschgefahr) relativ viel Zeit verlorengeht. Die Stapel können nach anfänglichem relativem Stillstand zwischen Bänder und Wagen nach dem Lösen der Haltebacken relativ zu dem bewegten Wagen beschleunigt werden, so daß sie, wenn der Wagen in seine Endposition gelangt ist, mit der erreichten Geschwindigkeit auf einen weiteren Förderer übergeben werden können und Verzögern sowie neues Beschleunigen entfällt.
Ist ein Stapel durch die angetriebenen Bänder von dem Gerüst oder Wagen entfernt worden, so werden die Bänder wieder zu der Ansammelstelle zurückbewegt. Sie müssen unter die Unterfläche des inzwischen herangeförderten, d. h. im allgemeinen abgesenkten weiteren Stapels gelangen, wobei eine Relativbewegung in Förderrichtung der Stapel, also im allgemeinen in horizontaler Richtung, unerwünscht ist, um Beeinträchtigungen der Unterfläche des weiteren Stapels zu vermeiden. Gemäß einer besonders vorteilhaften Weiterbildung der Erfindung wird dieses Teilproblem dadurch gelöst, daß der Wagen mit den über Rollen geführten Bändern zur Sammelstation hinbewegt wird, während die Bänder festgehalten werden, so daß sich Bandabschnitte ohne Relativbewegungen in Förderrichtung bezüglich der Unterfläche des weiteren Stapels an dessen Unterfläche fortlaufend anlegen. Eine Beschädigung dieser Unterfläche wird somit zuverlässig vermieden.
Der weitere Stapel wird gemäß der Erfindung zumindest auf dem größten Teil seiner Unterfläche unterstützt, während er in die Abförderposition abgesenkt wird. Hierzu kann ein absenkbarer Tisch verwendet werden, aus dessen Oberfläche Druckluft strömt, wenn eine Relativbewegung zwischen Tisch und Stapel in oder parallel zur Abförderrichtung stattfinden soll. Durch die Druckluft wird die Reibung zwischen Tischoberfläche und Stapelunterfläche so stark verringert, daß eine Beeinträchtigung der Unterfläche bei einer Relativbewegung praktisch ausgeschlossen ist. Tisch und Bänder sind synchron so antreibbar, daß die Bänder den abgeförderten Stapel unterstützen, während der Tisch den weiteren Stapel in dem von dem darunter abgeförderten Stapel freigegebenen Bereich abstützt.
Gemäß einer Weiterbildung der Erfindung kann zwischen die Stapel Druckluft eingeblasen werden, um die Reibung zu vermindern. Der über dem Stapel, der sich in Abförderposition befindet, befindliche weitere Stapel kann von mindestens einem Trennfinger gehalten werden, bis er in Abförderposition abgesenkt wird. Aus diesem Trennfinger kann vorteilhaft Druckluft zur besseren Trennung der Stapel bzw. zur Verminderung der Reibung zwischen diese geblasen werden. Eine weitere Verbesserung der Abförderung des Stapels aus seiner Abförderposition erhält man dadurch, daß der Stapel an einer von der Förderrichtung abgewandten Begrenzungsfläche geschoben wird.According to an advantageous development of the invention, a stack to be conveyed is supported at least on the largest part of its lower surface, while it is only held on a relatively small part of its surface. The support can cover the entire bottom surface of the stack. According to a development of the invention, the stack is advantageously held in an edge zone of its surface which lies in the conveying direction. The holding surface holding the stack on its surface advantageously consists of a jaw which, after the stack has been formed, separates it from sheets accumulated above it.
According to a further development of the invention, the bottom surface of a stack can be supported in the removal of belts, which can be guided over rollers, which are mounted in a preferably horizontally movable carriage. The tapes can then advantageously be removed first with the stack, wherein they are not driven relative to the carriage. Only when the stack is sufficiently far away from its removal position can they be driven according to a further development of the invention in order to also remove the stack from the belts.
A particularly advantageous development of the invention, which is generally applicable for the promotion of stacks of sheets and which therefore has independent inventive content, consists in the fact that the belts stand still relative to a carriage carrying them until the stacks are first removed from the surface of the stack moving cheek has released from the stack, and that the belts are then driven with the stack relative to the carriage in the conveying direction.
This further development avoids having to first stop the stacks with the car and then accelerate them again through the belts, which means that a relatively large amount of time is lost due to the limited deceleration and acceleration values (risk of slipping). The stacks can be accelerated relative to the moving carriage after releasing the holding jaws after the initial relative standstill between the belts and the carriage, so that when the carriage has reached its end position, it can be transferred to another conveyor at the speed reached and decelerated as well as new acceleration.
If a stack has been removed from the scaffolding or carriage by the driven belts, the belts are moved back to the collection point. They have to get under the lower surface of the stack that has now been brought up, that is to say generally lowered, a relative movement in the conveying direction of the stack, that is to say generally in the horizontal direction, being undesirable in order to avoid impairment of the lower surface of the further stack. According to a particularly advantageous development of the invention, this sub-problem is solved in that the carriage with the belts guided over rollers is moved to the collecting station while the belts are being held, so that belt sections without relative movements in the conveying direction with respect to the lower surface of the further stack on the lower surface thereof Create continuously. Damage to this lower surface is thus reliably avoided.
According to the invention, the further stack is supported at least on the largest part of its lower surface while it is lowered into the removal position. This can be lowered Table are used, from the surface of which compressed air flows when a relative movement between the table and the stack is to take place in or parallel to the discharge direction. The compressed air reduces the friction between the table surface and the lower surface of the stack so much that impairment of the lower surface during a relative movement is practically impossible. The table and belts can be driven synchronously so that the belts support the stack being removed, while the table supports the further stack in the area released by the stack underneath.
According to a development of the invention, compressed air can be blown in between the stacks in order to reduce the friction. The further stack located above the stack, which is in the removal position, can be held by at least one separating finger until it is lowered into the removal position. Compressed air can advantageously be blown from this separating finger in order to better separate the stacks or to reduce the friction between them. A further improvement in the removal of the stack from its removal position is obtained by pushing the stack on a boundary surface facing away from the conveying direction.

Die eingangs genannte Anordnung, die insbesondere zum Ausüben des Verfahrens gemäß der Erfindung dient, ist dadurch gekennzeichnet, daß für einen über dem Stapel angeordneten weiteren Stapel ein weiteres Halteelement vorgesehen ist, das mit einer Absenkeinrichtung zum Absenken des weiteren Stapels und des weiteren Halteelements nach erfolgter Abförderung des in Abförderposition befindlichen Stapels versehen ist.The arrangement mentioned at the outset, which is used in particular to carry out the method according to the invention, is characterized in that a further holding element is provided for a further stack arranged above the stack, which holding element is provided with a lowering device for lowering the further stack and the further holding element Removal of the stack located in the removal position is provided.

Weiterbildungen und weitere Ausgestaltungen der Anordnung gemäß der Erfindung sind den entsprechenden Unteransprüchen zu entnehmen.Further developments and further refinements of the arrangement according to the invention can be found in the corresponding subclaims.

Die Erfindung weist mehrere Vorteile auf:
Der abzufördernde Stapel wird bei der Abförderung sicher gehalten. Seine Blätter können sich auch bei größerer Stapelhöhe kaum verschieben, so daß es nicht zu dem gefürchteten Verrutschen von Blättern oder Blattlagen innerhalb des Stapels kommt.The invention has several advantages:
The stack to be removed is held securely during removal. Its sheets can hardly move even with a larger stack height, so that there is no fear of slipping of sheets or sheet layers within the stack.

Die Ansammlung neuer Stapel wird bei der Entfernung des untersten Stapels nicht beeinträchtigt.The accumulation of new stacks is not affected when the bottom stack is removed.

Durch die speziellen Ausgestaltungen der Erfindung (Blasluft zwischen den Stapeln. Abstützung durch Lufttisch) werden Beeinträchtigungen der Unter- oder Oberflächen der Stapel beim Abfördern des jeweils untersten Stapels zuverlässig vermieden.The special configurations of the invention (blown air between the stacks. Support by air table) reliably prevent damage to the bottom or surface of the stacks when the bottom stack is being removed.

Da die Backen abwechselnd Trenn- und danach Haltefunktion haben, wobei eine Backe ihre Position bezüglich des jeweils unter ihr befindlichen Stapels beim Übergang von der Trennzu der Haltefunktion nicht ändert, wird außer der Sicherheit auch die Geschwindigkeit erhöht, mit der die Stapel abgefördert werden können.
Durch die spezifische Ausbildungsform des Wagens und des Bänderantriebes, bei dem beim Abfördern eines Stapels dessen Geschwindigkeit bis zur Abgabe an einen Abförderer sich nicht ändert, d. h. dessen Geschwindigkeit zumindest weitgehend unabhängig von den Geschwindigkeitsänderungen des die Bänder tragenden Wagens ist, wirken auch bei hohen Abfördergeschwindigkeiten nur beherrschbare Beschleunigungs-und Verzögerungskräfte auf den Stapel, was die Gefahr des Verrutschens vermindert.Since the jaws alternate between separating and then holding, whereby a jaw does not change its position with respect to the stack below it during the transition from the separating to the holding function, the speed with which the stacks can be removed is increased in addition to safety.
Due to the specific design of the trolley and the belt drive, in which when a stack is removed, its speed does not change until it is delivered to a conveyor, i.e. its speed is at least largely independent of the speed changes of the trolley carrying the belts, only work at high removal speeds controllable acceleration and deceleration forces onto the stack, which reduces the risk of slipping.

Die Erfindung wird anhand eines Ausführungsbeispiels näher erläutert.The invention is explained in more detail using an exemplary embodiment.

Es zeigen:

Figuren 1 bis 5
eine Förderanordnung gemäß der Erfindung in verschiedenen Ablaufzuständen,
Figur 6
eine Draufsicht auf Halte- bzw. Trennbacken und Trennfinger,
Figur 7
eine Halte- bzw. Trennbacke in einer Seitenansicht in vergrößertem Maßstab.
Show it:
Figures 1 to 5
a conveyor arrangement according to the invention in different operational states,
Figure 6
a plan view of holding or separating jaws and separating fingers,
Figure 7
a holding or separating jaw in a side view on an enlarged scale.

Einzelheiten der Anordnung gemäß der Erfindung werden anhand der Figuren 1 bis 5 beschrieben.
Dabei wird in Figur 1 näher auf den Aufbau und die einzelnen Elemente der Anlage eingegangen, während die weiteren Figuren 2 bis 5 der Beschreibung des Funktionsablaufes dienen.Details of the arrangement according to the invention are described with reference to Figures 1 to 5.
The structure and the individual elements of the system are discussed in more detail in FIG. 1, while the further FIGS. 2 to 5 serve to describe the functional sequence.

In Figur 1 befindet sich an einer Sammelstation oder Sammelstelle SS ein Blätterstapel 1 in seiner Abförderposition AP, in der er zur Abförderung in Förderrichtung FR bereitsteht. Er ruht mit seiner Unterfläche 2 auf in der Zeichenebene hintereinander angeordneten Bändern 3 (nur eines sichtbar), die eine Unterlage darstellen und über Rollen 4 ... 8 geführt sind. Die Rollen 4 und 6 sind in einem Wagen 9 drehbar gelagert, wobei die Rolle 4 durch eine elektrisch steuerbare Bremse 10 festsetzbar ist. Die Rollen 6, 7 und 8 sind ortsfest gelagert, wobei die Rolle 8 von einem Antrieb in Form eines Elektromotors 11 antreibbar und von einer elektrisch steuerbaren Bremse 12 festsetzbar ist. Ein Antrieb für den Wagen 9 in Form eines Elektromotors 13 ist mit einer Spindel 14 durch eine an dem Wagen befestigte Spindelmutter 16 geführt, so daß er den Wagen je nach Drehrichtung in Förderrichtung FR oder in Gegenrichtung RF anzutreiben vermag.Dabei läuft der Wagen 9 mit Rollen 17 auf einer Lauffläche 18. Führungsflächen für den Stapel 1 sind mit 19, 21 und 22 bezeichnet. Ein Förderband 23 in einer Übergabeposition ÜP dient zum Entfernen des von dem Wagen 9 übergebenen Stapels 1.
An dem Wagen 9 befestigt ist eine Unterstützungsfläche in Form eines sogenannten Lufttisches 26, der an sich bekannt ist. Derartige Tische haben einen Innenraum, der mit einer Druckluftquelle 27 in Verbindung steht, was durch eine flexible Schlauchleitung 28 angedeutet ist.In FIG. 1, a stack of sheets 1 is located at a collecting station or collecting point SS in its removal position AP, in which it is ready for removal in the conveying direction FR. It rests with its lower surface 2 on belts 3 (only one visible) arranged one behind the other in the plane of the drawing, which form a base and are guided over rollers 4 ... 8. The rollers 4 and 6 are rotatably mounted in a carriage 9, the roller 4 being fixable by an electrically controllable brake 10. The rollers 6, 7 and 8 are mounted in a stationary manner, the roller 8 being drivable by a drive in the form of an electric motor 11 and being fixable by an electrically controllable brake 12. A drive for the carriage 9 in the form of an electric motor 13 is guided with a spindle 14 through a spindle nut 16 fastened to the carriage, so that it can drive the carriage in the conveying direction FR or in the opposite direction RF, depending on the direction of rotation Rollers 17 on a tread 18. Guide surfaces for the stack 1 are designated 19, 21 and 22. A conveyor belt 23 in a transfer position ÜP serves to remove the stack 1 transferred by the carriage 9.
A support surface in the form of a so-called air table 26, which is known per se, is attached to the carriage 9. Tables of this type have an interior which is connected to a compressed air source 27, which is indicated by a flexible hose line 28.

Die Oberfläche solcher bekannten Lufttische weist Bohrungen 29 auf, die von nicht dargestellten federbelasteten Kugeln verschlossen sind. Werden diese Kugeln unter der Wicklung einer Last, z. B. eines Blätterstapels, niedergedrückt, so strömt Druckluft aus den Bohrungen, die einen Luftfilm bildet, der die Reibung zwischen Tischoberfläche und Unterfläche des Stapels verringert. Der Lufttisch ist mit dem Wagen 9 so verbunden, daß er in Förderrichtung FR mit dem Wagen mitläuft, wobei Rollen 31 des Lufttisches auf Schienen 32 laufen. Über geeignete mit 35 bezeichnete Führungen ist der Lufttisch gegenüber dem Wagen 9 vertikal verschiebbar, wenn eine Absenkeinrichtung 33, die auch als Hubeinrichtung arbeiten kann, die Schienen 32 senkt oder hebt. Die Absenkeinrichtung ist als senk- und hebbare Schere 34 mit den Schenkeln 36 und 37 ausgebildet. Die Schenkel 36 sind an den Schienen 32 mittels Gelenke 38 drehbeweglich gelagert und an einer Bodenfläche 39 in Gleitführungen 41 geführt. Die Schenkel 37 sind an der Bodenfläche 39 mittels Gelenke 42 drehbeweglich gelagert und an den Schienen 32 mittels Gleitführungen 43 schiebebeweglich gelagert. Mittels eines Antriebes in Form eines Elektromotors 44, einer Spindelmutter 46 und einer Spindel 47 sind die Schienen 32 und mit ihnen der Lufttisch 26 um etwa eine Stapelhöhe hebbar und senkbar.
Über dem Stapel 1 befindet sich ein bereits gebildeter weiterer Blätterstapel 51. Zwischen den beiden Stapeln befinden sich Trennfinger 52 (in Fig. 6 in der Draufsicht sichtbar) und zwischen den einzelnen Trennfingern eine Backe 53 in Form von zweizinkigen Gabeln 54 (ebenfalls aus Fig. 6 ersichtlich). Die Backe 53 ruht mit ihren Halteflächen auf der Oberfläche 55 des Stapels 1 in einer in Förderrichtung FR befindlichen Randzone RZ, in der sie eine aus Figur 1 hervorgehenden Trennfunktion hat. Die Trennfinger 52 sind über eine flexible Leitung 56 mit einer Druckluftquelle 57 verbunden, so daß sie aus ihrem Innenraum durch Kanäle Druckluft zwischen die Stapel 1 und 51 blasen können, was die Haftung und Reibung zwischen diesen Stapeln vermindert. Auch die Gabeln 54 der Backe 53, von der Figur 7 Einzelheiten zeigt, hat einen in Fig. 7 dargestellten flexiblen Anschluß 81 an eine Druckluftquelle 82, so daß aus ihr, wenn sie sich in Trennpositionen befindet, ebenfalls Luft unter Druck ausblasbar ist. Die Gabeln 54 der Backe 53 sind mit einem gemeinsamen pneumatischen Antrieb 58 für eine Bewegung in horizontaler Richtung und mit einem pneumatischen Antrieb 59 für eine Bewegung in vertikaler Richtung verbunden. Die Trennfinger 52 haben einen gemeinsamen pneumatischen Antrieb 62 für eine Bewegung in horizontaler Richtung.The surface of such known air tables has bores 29 which are closed by spring-loaded balls, not shown. If these balls are under the winding of a load, e.g. B. a stack of sheets, depressed, compressed air flows from the holes, which forms an air film that reduces the friction between the table surface and the bottom surface of the stack. The air table is connected to the carriage 9 so that it runs along with the carriage in the conveying direction FR, with rollers 31 of the air table running on rails 32. The air table can be displaced vertically relative to the carriage 9 by means of suitable guides, designated 35, when a lowering device 33, which can also function as a lifting device, lowers or raises the rails 32. The lowering device is designed as lowerable and liftable scissors 34 with the legs 36 and 37. The legs 36 are rotatably mounted on the rails 32 by means of joints 38 and are guided in sliding guides 41 on a bottom surface 39. The legs 37 are rotatably mounted on the bottom surface 39 by means of joints 42 and are mounted on the rails 32 by means of sliding guides 43 so that they can be moved. By means of a drive in the form of an electric motor 44, a spindle nut 46 and a spindle 47, the rails 32 and with them the air table 26 can be raised and lowered by approximately a stack height.
There is an already formed stack of sheets 51 above the stack 1. Between the two stacks there are separating fingers 52 (seen in plan view in FIG. 6) and between the individual separating fingers a jaw 53 in the form of two-pronged forks 54 (also from FIG. 6 can be seen). The jaw 53 rests with its holding surfaces on the surface 55 of the stack 1 in an edge zone RZ located in the conveying direction FR, in which it has a separating function as shown in FIG. The Parting fingers 52 are connected via a flexible line 56 to a compressed air source 57, so that they can blow compressed air from their interior through ducts between stacks 1 and 51, which reduces the adhesion and friction between these stacks. The forks 54 of the jaw 53, of which FIG. 7 shows details, also have a flexible connection 81, shown in FIG. 7, to a compressed air source 82, so that, when it is in separation positions, air can also be blown out under pressure. The forks 54 of the jaw 53 are connected to a common pneumatic drive 58 for movement in the horizontal direction and to a pneumatic drive 59 for movement in the vertical direction. The separating fingers 52 have a common pneumatic drive 62 for movement in the horizontal direction.

Auf dem weiteren Stapel 51 befindet sich eine weitere Backe 63 in einer Position, in der sie eine Trennfunktion ausübt, wobei sie den weiteren Stapel 51 von einem gerade in Bildung begriffenen neuen Blätterstapel 61 trennt. Die weitere Backe 63 besteht ebenfalls aus Gabeln 64, die mit einem gemeinsamen pneumatischen Antrieb 66 für eine Bewegung in horizontaler Richtung und mit einem gemeinsamen pneumatischen Antrieb 67 für eine Bewegung in vertikaler Richtung verbunden sind. Die Backe 63 ist wie die Backe 53 über einen in Fig. 7 dargestellten Luftanschluß 81 mit einer Druckluftquelle 82 verbunden, so daß Druckluft aus der Backe ausblasbar ist, wenn sich diese in ihrer Trennposition befindet.
Die pneumatischen Antriebe 58, 59, 62, 66 und 67 erhalten ihre Druckluft für die von ihnen zu veranlassenden Hin- und Herbewegungen über schematisch angedeutete Luftleitungen 58a, 58b bzw. 59a, 59b bzw. 62a, 62b bzw. 66a, 66b bzw. 67a, 67b von einem Druckluftgeber 68, dessen Ausgänge von einer Steueranordnung 69 gesteuert werden.
Die Steueranordnung steuert auch die elektrischen Antriebsmotoren 11, 13 und 44 über schematisch angedeutete Leitungen 11a bzw. 13a bzw. 44a und die steuerbaren Bremsen 10 und 12 über schematisch angedeutete Steuerleitungen 10a bzw. 12a. Die Steuerung der vorgenannten pneumatischen und elektrischen Antriebe erfolgt in Abhängigkeit von den Maschinentakten, in denen der Sammelstation SS Blätter 71 von einem über Rollen 72 und 73 geführten Förderband 74 zugeführt werden. Die Blätter sind z. B. von einem nicht dargestellten Gleichlaufschneider von einer fortlaufenden Materialbahn, z. B. einer Papierbahn, abgeschnitten und werden zu einem neuen Stapel 61 über der in ihrer Trennposition befindlichen weiteren Backe 63 angesammelt. Mit 75 und 76 sind sogenannte Anrichter bezeichnet, die meist als Bleche ausgebildet sind, die von einem Vibrator in Vibrationen versetzt werden und die Aufgabe haben, die Blätter der Stapel nach dem Ansammeln auszurichten, so daß die Begrenzungsflächen möglichst glatt sind. 77 ist ein Schieber, der die Aufgabe hat, die Abförderung des Stapels 1 dadurch zu unterstützen, daß er auf die Fläche 78 des Stapels 1 drückt.On the further stack 51 there is a further jaw 63 in a position in which it performs a separating function, wherein it separates the further stack 51 from a new stack of sheets 61 which is just being formed. The further jaw 63 also consists of forks 64 which are connected to a common pneumatic drive 66 for movement in the horizontal direction and to a common pneumatic drive 67 for movement in the vertical direction. The jaw 63, like the jaw 53, is connected to a compressed air source 82 via an air connection 81 shown in FIG. 7, so that compressed air can be blown out of the jaw when it is in its separation position.
The pneumatic drives 58, 59, 62, 66 and 67 receive their compressed air for the back and forth movements to be initiated by them via schematically indicated air lines 58a, 58b or 59a, 59b or 62a, 62b or 66a, 66b or 67a, 67b from a compressed air transmitter 68, the outputs of which are controlled by a control arrangement 69.
The control arrangement also controls the electric drive motors 11, 13 and 44 via schematically indicated lines 11a or 13a or 44a and the controllable brakes 10 and 12 via schematically indicated control lines 10a or 12a. The above-mentioned pneumatic and electric drives are controlled as a function of the machine cycles in which sheets 71 are fed to the collecting station SS from a conveyor belt 74 guided over rollers 72 and 73. The leaves are e.g. B. from a rotary cutter, not shown, from a continuous web of material, for. B. a paper web, cut off and are collected into a new stack 61 over the other jaw 63 in its separating position. With 75 and 76 so-called plates are referred to, which are usually designed as sheets that are vibrated by a vibrator and have the task of aligning the sheets of the stack after accumulation, so that the boundary surfaces are as smooth as possible. 77 is a slide which has the task of supporting the removal of the stack 1 by pressing on the surface 78 of the stack 1.

Figur 6 zeigt eine Draufsicht auf die Gabeln 64 der auf dem weiteren Stapel 51 ruhenden weiteren Backe 63, auf die Trennfinger 52 und die Gabeln 54 der Backe 53, etwa in der Stellung der Figur 4. Die strömende Luft ist ebenfalls angedeutet.FIG. 6 shows a plan view of the forks 64 of the further jaw 63 resting on the further stack 51, of the separating fingers 52 and of the forks 54 of the jaw 53, approximately in the position in FIG. 4. The flowing air is also indicated.

Figur 7 zeigt in vergrößertem Maßstab eine Seitenansicht eine Backe 53, 63 mit einem Luftauslaß 80, einem Luftkanal 79, einer flexiblen Leitung 81 (z. B. eine Schlauchleitung) und einer Druckluftquelle 82.FIG. 7 shows an enlarged side view of a jaw 53, 63 with an air outlet 80, an air channel 79, a flexible line 81 (for example a hose line) and a compressed air source 82.

Wirkungsweise der Anordnung gemäß der Erfindung:
Die Wirkungsweise wird anhand der Figuren 1 bis 5 erläutert, die die Bewegungsabläufe verdeutlichen. In den Figuren 2 bis 5 sind aus Gründen der Übersichtlichkeit die pneumatischen Leitungen von dem Druckluftgeber 68 zu den pneumatischen Antrieben sowie die elektrischen Leitungen von der Steuerungsanordnung 69 zu den elektrischen Antrieben und den steuerbaren Bremsen weggelassen.
In Figur 1 befindet sich der abzufördernde Stapel 1 in seiner Abförderposition AP, aus der er, auf den Bändern 3 ruhend, mittels des Wagens 9 zu seiner Übergabeposition ÜP gefördert und dort auf das Abförderband 23 übergeben und zur weiteren Verarbeitung, z. B. zur Verpackung, entfernt wird. Die Trennfinger 52 und die Backe 53 befinden sich in einer Randzone RZ über dem Stapel 1 in einer Trennposition, in der sie zum Ausüben ihrer Trennfunktion in einen Zwischenraum ZW zwischen dem Stapel 1 und einem weiteren Stapel 51, der die gleiche Höhe hat wie Stapel 1, hineinragen. Aus den Trennfingern 52 und den Gabeln 54 der Backe 53 strömt Druckluft in den Zwischenraum ZW zur Verringerung der Reibung zwischen der Unterfläche des Stapels 51 und der Oberfläche 55 des Stapels 1, wodurch auch die später beschriebene Trennung beider Stapel voneinander erleichtert wird.
Über einer Randzone RZ des weiteren Stapels 51 befinden sich die Gabeln 64 der weiteren Backe 63 in einer Trennposition, in der sie zum Ausüben ihrer Trennfunktion in den Zwischenraum ZW zwischen dem weiteren Stapel 51 und einem in seiner Bildung befindlichen neuen Stapel 61 hineinragen; zur Reibungsverminderung und besseren Trennung wird ebenfalls Druckluft in diesen Zwischenraum geblasen.Operation of the arrangement according to the invention:
The mode of operation is explained with reference to FIGS. 1 to 5, which illustrate the movement sequences. For reasons of clarity, FIGS. 2 to 5 omit the pneumatic lines from the compressed air transmitter 68 to the pneumatic drives and the electrical lines from the control arrangement 69 to the electrical drives and the controllable brakes.
In FIG. 1, the stack 1 to be removed is in its removal position AP, from which it, resting on the belts 3, is conveyed by means of the carriage 9 to its transfer position UP and transferred there to the removal belt 23 and transferred for further processing, e.g. B. for packaging is removed. The separating fingers 52 and the jaw 53 are located in an edge zone RZ above the stack 1 in a separating position in which they perform their separating function in an intermediate space ZW between the stack 1 and a further stack 51 which has the same height as stack 1 protrude. Compressed air flows from the separating fingers 52 and the forks 54 of the jaw 53 into the intermediate space ZW to reduce the friction between the lower surface of the stack 51 and the surface 55 of the stack 1, which also makes it easier to separate the two stacks from one another, which will be described later.
Above an edge zone RZ of the further stack 51, the forks 64 of the further jaw 63 are in a separating position in which they protrude into the intermediate space ZW between the further stack 51 and a new stack 61 that is being formed in order to perform their separating function; Compressed air is also blown into this space to reduce friction and improve separation.

Zum Einleiten der Abförderung des Stapels 1 erhält der Elektromotor 13 des Wagens 9 von der Steueranordnung 69 über Leitung 13a ein Steuersignal, so daß er anläuft und den Wagen in Abförderrichtung FR in Bewegung setzt. Gleichzeitig erhält der pneumatische Antrieb 58 der Backe 53 über Leitung 58a vom Druckluftgeber 68 Druckluft, so daß die Backe 53 synchron zu dem Wagen 9 in Richtung FR verfahren wird, wobei sie auf der Randzone RZ der Stapeloberfläche 55 ruht und somit ihre Haltefunktion ausübt. Die Bremse 10 der Rolle 4 ist angezogen, so daß die Bänder 3 mit dem Stapel 1 noch relativ zu dem Wagen 9 in Ruhe sind. Die Bremse 12 erhält von der Steueranordnung 69 über Leitung 12a ein Steuersignal zum Lösen; gleichzeitig erhält der Elektromotor 11 über Leitung 11a ein Steuersignal, so daß er anläuft und die Rolle 8 unter Zugspannung setzt. Der Antrieb für die Bänder 3 kann auch so ausgebildet sein, daß der Elektromotor 11 stets durchläuft und die Übertragung seines Momentes auf die Bänder 3 lediglich über die steuerbare Bremse 12 erfolgt. Die Drehzahl des Elektromotors 11 ist so gewählt, daß die Rolle 8 eine etwas höhere Umfangsgeschwindigkeit hat als die Geschwindigkeit des Wagens 9 in Richtung FR, so daß die Obertrume der Bänder 3 stets straff gespannt sind.
Die Backe 53 wirkt in der vorbeschriebenen Weise somit als Haltebacke, so daß der Stapel 1 sich sicher von dem darüberliegenden weiteren Stapel 51 lösen und beschleunigt werden kann. Die Trennung wird von der Druckluft aus den Trennfingern 52 und eventuell aus der Backe 53 unterstützt. Die Abförderung des Stapels 1 wird durch den Schieber 77 unterstützt, der an der Stapelfläche 78 drückt.
Bei der Abförderung gelangt der Lufttisch 26 gemäß Figur 2 zunehmend weiter unter den weiteren Stapel 51, wobei aus den Bohrungen 29 der überdeckten Flächen Luft strömt, die die Reibung zwischen der Tischoberfläche und der Stapelunterfläche verringert.To initiate the removal of the stack 1, the electric motor 13 of the carriage 9 receives a control signal from the control arrangement 69 via line 13a so that it starts up and sets the carriage in motion in the removal direction FR. At the same time, the pneumatic drive 58 of the jaw 53 receives compressed air via line 58a from the compressed air generator 68, so that the jaw 53 is moved synchronously with the carriage 9 in the FR direction, resting on the edge zone RZ of the stacking surface 55 and thus performing its holding function. The brake 10 of the roller 4 is tightened so that the belts 3 with the stack 1 are still at rest relative to the carriage 9. The brake 12 receives a control signal for release from the control arrangement 69 via line 12a; at the same time, the electric motor 11 receives a control signal via line 11a, so that it starts up and sets the roller 8 under tension. The drive for the belts 3 can also be designed such that the electric motor 11 always runs through and the transmission of its torque to the belts 3 only takes place via the controllable brake 12. The speed of the electric motor 11 is selected so that the roller 8 has a slightly higher peripheral speed than the speed of the carriage 9 in the FR direction, so that the upper strands of the belts 3 are always taut.
The jaw 53 thus acts as a holding jaw in the manner described above, so that the stack 1 can be safely detached from the stack 51 above and accelerated. The separation is supported by the compressed air from the separation fingers 52 and possibly from the jaw 53. The removal of the stack 1 is supported by the slide 77, which presses on the stacking surface 78.
During the removal, the air table 26 according to FIG. 2 increasingly passes under the further stack 51, air flowing out of the bores 29 of the covered surfaces reduces the friction between the table surface and the stacking surface.

Figur 3 zeigt, daß die Backe 53 nach Beginn der Förderung durch ihren pneumatischen Antrieb 67 von der Oberfläche 55 des Stapels 1 abgehoben wird, da ihre Haltefunktion nur während des Beginns und der ersten Phase der Abförderung benötigt wird. Sie wird nach Durchführung eines Hubes um ca. eine Stapelhöhe von dem Antrieb 58 in horizontaler Richtung zur Sammelstation SS zurückgefördert und über die Randzone RZ des neuen Stapels 61 (Fig. 4 u. 5) gefördert, sobald dieser seine vorgeschriebene Größe erreicht hat. In dieser Position übt die Backe 53 eine Trennfunktion aus, indem sie den neuen Stapel 61 von weiteren von oben der Sammelstation SS zugeführten Blättern 71 trennt. Die Trennfunktion wird durch die aus den Gabeln 54 der Backe 53 strömende Druckluft unterstützt.
Nach dem Abheben der Backe 53 von der Stapeloberfläche 55 wird die Bremse 10 durch ein Steuersignal über Leitung 10a gelöst, so daß die Bänder 3 nunmehr eine Relativbewegung zu dem Wagen 9 in Abförderrichtung FR ausführen können, wobei der Wagen von dem Elektromotor 13 weiter in Richtung FR bewegt wird. Die Geschwindigkeit der Bänder kann dabei so gesteuert werden, daß sie im Raum, z. B. bezogen auf die Lauffläche 18, im wesentlichen konstant ist unabhängig von der Geschwindigkeit, mit der der Wagen zu der Übergabeposition ÜP bewegt wird. Ist der Wagen 9 dort angelangt (Fig. 3), so können die Bänder 3 den Stapel 1 praktisch ohne Geschwindigkeitsänderungen über die Führungsflächen 21 und 22 auf das Förderband 23 schieben, das ihn anschließend zur Weiterverarbeitung entfernt. Diese vorbeschriebene Art der Abförderung ist eine sehr vorteilhafte Weiterbildung der Erfindung gegenüber einem Bewegungsablauf, wie er an sich naheliegt und bei dem der Wagen 9 zunächst in Position ÜP verfahren würde, wonach erst der Antrieb der Bänder 3 eingeschaltet würde, um den Stapel 1 vom Wagen 9 herunterzufördern. Bei der zuletzt genannten Betriebsweise müßte der Stapel 1 zunächst mit dem Wagen 9 verzögert und anschließend mit den Bändern 3 wieder beschleunigt werden. Da wegen der Gefahr des Verrutschens die Beschleunigungs- und Verzögerungswerte bei Blöcken beschränkt sind, würden sich relativ lange Zeiten ergeben, bis ein Stapel von dem Wagen 9 auf das Förderband 23 übergeben worden ist. Gemäß der Erfindung ist dieser zusätzliche "Engpaß" der Stapelabförderung optimal gelöst; die Beschleunigung kann durch Verwendung der Backen groß gehalten werden und anschließend werden Verzögerungen und Beschleunigungen vermieden, bis der Stapel übergeben worden ist.Figure 3 shows that the jaw 53 is lifted by the pneumatic drive 67 from the surface 55 of the stack 1 after the start of the conveyance, since its holding function is only required during the beginning and the first phase of the conveyance. After a stroke, it is conveyed back by approximately one stack height from the drive 58 in the horizontal direction to the collecting station SS and conveyed over the edge zone RZ of the new stack 61 (FIGS. 4 and 5) as soon as it has reached its prescribed size. In this position, the jaw 53 performs a separating function by separating the new stack 61 from further sheets 71 fed from above to the collecting station SS. The separation function is supported by the compressed air flowing out of the forks 54 of the jaw 53.
After the jaw 53 has been lifted off the stack surface 55, the brake 10 is released by a control signal via line 10a, so that the belts 3 can now carry out a relative movement to the carriage 9 in the discharge direction FR, the carriage moving further from the electric motor 13 in the direction FR is moved. The speed of the tapes can be controlled so that they are in space, for. B. based on the tread 18, is substantially constant regardless of the speed at which the carriage is moved to the transfer position ÜP. When the carriage 9 has arrived there (FIG. 3), the belts 3 can push the stack 1 onto the conveyor belt 23 practically without changes in speed over the guide surfaces 21 and 22, which then removes it for further processing. This type of removal described above is a very advantageous development of the invention over one Sequence of movements as it is obvious and in which the carriage 9 would first move into the position ÜP, after which the drive of the belts 3 would only be switched on in order to convey the stack 1 down from the carriage 9. In the latter mode of operation, the stack 1 would first have to be decelerated with the carriage 9 and then accelerated again with the belts 3. Since the acceleration and deceleration values for blocks are limited because of the risk of slipping, relatively long times would result until a stack has been transferred from the carriage 9 to the conveyor belt 23. According to the invention, this additional "bottleneck" of the stack removal is optimally solved; the acceleration can be kept high by using the jaws and then delays and accelerations are avoided until the stack has been handed over.

Wenn der Wagen 9 seine rechte Endposition erreicht hat, muß der inzwischen ganz auf dem Lufttisch 26 ruhende weitere Stapel 51 in die Abförderposition AP abgesenkt werden, wozu der elektrische Antriebsmotor 44 eingeschaltet wird. Dieser Motor dreht die Spindel 47, die die Schere 34 um die Höhe des weiteren Stapels 51 nach unten zieht, wodurch dieser in die aus Figur 4 hervorgehende Abförderposition AP gelangt. Vor Beginn der Absenkung werden die Trennfinger 52 von ihrem pneumatischen Antrieb 62, der über Leitung 62a Druckluft erhält, aus dem Zwischenraum ZW zwischen den Stapeln entfernt, bis der weitere Stapel 51 seine Abförderposition AP erreicht hat. In dieser Position bewegt der pneumatische Antrieb 62 die Trennfinger 52 wieder in die aus Figur 5 ersichtliche Lage zwischen den Stapeln. Der pneumatische Antrieb 67 der weiteren Backe 63 senkt diese synchron mit dem darunter befindlichen weiteren Stapel 51 ab, so daß die Backe 63 ihre Trennfunktion beibehält, bis sie beim darauffolgenden Abfördern des weiteren Stapels 51 ihre Haltefunktion ausübt.
Hat der Stapel 1 entsprechend Figur 4 die Bänder 3 des Wagens 7 verlassen, so wird der Wagen 9 von dem Elektromotor 13, der ein entsprechendes Steuersignal über Leitung 13a erhält, in Gegenrichtung RF zurückbewegt. Hierbei ist die Rolle 8 über die steuerbare Bremse 12, die ein Steuersignal über Leitung 12a erhält, festgesetzt, während die Bremse 10 geöffnet bleibt. Hierdurch legen sich Bandabschnitte der Bänder 3 aufeinanderfolgend von unten gegen die Unterfläche des weiteren Stapels 51 an, ohne eine Relativbewegung in Gegenrichtung RF auszuführen, so daß die Gefahr von Beschädigungen der Unterfläche ausgeschlossen ist. Der noch nicht von den Bändern 3 unterstützte Teil der Unterfläche des weiteren Stapels 51 wird noch von dem Lufttisch 26 gestützt, der zusammen mit dem Wagen 9 in Richtung RF bewegt wird, wobei er auf den Schienen 32 läuft, die sich in der unteren aus den Figuren 4 und 5 hervorgehenden Stellung befinden.
Hat der neue Stapel 61 seine vorgeschriebene Größe erreicht, so wird, wie Fig. 5 zeigt, die Backe 53 von ihrem pneumatischen Antrieb 58 in ihre in Fig. 5 gezeichnete Trennposition bewegt, wo sie den weiteren Stapel 61 von darüber abgelegten weiteren Blättern 71 trennt.
Der Elektromotor 44 erhält nunmehr über Leitung 44a ein Steuersignal zum Ausführen einer entgegengesetzten Antriebsbewegung, durch die die Schere 34 zusammen mit den Schienen 32 und dem Lufttisch 26 wieder in die aus Figur 1 ersichtliche Ausgangsposition verbracht wird und die Anförderung des auf den Bändern 3 ruhenden weiteren Stapels 51 in der für den Stapel 1 beschriebenen Weise erfolgen kann.When the carriage 9 has reached its right end position, the further stack 51, which is now completely on the air table 26, must be lowered into the removal position AP, for which purpose the electric drive motor 44 is switched on. This motor rotates the spindle 47, which pulls the scissors 34 downward by the height of the further stack 51, as a result of which the latter reaches the discharge position AP shown in FIG. 4. Before the lowering begins, the separating fingers 52 are removed by their pneumatic drive 62, which receives compressed air via line 62a, from the intermediate space ZW between the stacks until the further stack 51 has reached its removal position AP. In this position, the pneumatic drive 62 moves the separating fingers 52 back into the position between the stacks as shown in FIG. The pneumatic drive 67 of the further jaw 63 lowers it in synchronism with the one below another stack 51, so that the jaw 63 maintains its separating function until it performs its holding function when the further stack 51 is subsequently removed.
4 has left the belts 3 of the carriage 7, the carriage 9 is moved back in the opposite direction RF by the electric motor 13, which receives a corresponding control signal via line 13a. Here, the roller 8 is fixed via the controllable brake 12, which receives a control signal via line 12a, while the brake 10 remains open. As a result, belt sections of the belts 3 lie in succession from below against the lower surface of the further stack 51 without executing a relative movement in the opposite direction RF, so that the risk of damage to the lower surface is excluded. The part of the lower surface of the further stack 51 which is not yet supported by the belts 3 is still supported by the air table 26, which is moved together with the carriage 9 in the direction of RF, running on the rails 32 which in the lower one extend from the Figures 4 and 5 emerging position.
When the new stack 61 has reached its prescribed size, as shown in FIG. 5, the jaw 53 is moved by its pneumatic drive 58 into the separating position shown in FIG. 5, where it separates the further stack 61 from further sheets 71 placed thereover .
The electric motor 44 now receives a control signal via line 44a for executing an opposite drive movement, by means of which the scissors 34 together with the rails 32 and the air table 26 are brought back into the starting position shown in FIG. 1 and the feeding of the rest resting on the belts 3 Stack 51 can be done in the manner described for stack 1.

Aus der obigen Beschreibung ersieht man, daß die Backen 53 und 63 ihre Trenn- und Haltefunktionen nacheinander ausüben und sich dabei abwechseln. Besonders vorteilhaft ist dabei, daß die Backen 53, 63 ihre relative Lage bezüglich der Randzonen RZ der Stapel weder bei ihrer Trennnoch bei ihrer Haltefunktion ändern, was die Bewegungsabläufe der Stapel günstig beeinflußt und ebenfalls höhere Geschwindigkeiten erlaubt.From the above description it can be seen that the jaws 53 and 63 perform their separating and holding functions one after the other and alternate in the process. It is particularly advantageous that the jaws 53, 63 do not change their relative position with respect to the edge zones RZ of the stack, neither in their separating nor in their holding function, which has a favorable influence on the movement sequences of the stack and also permits higher speeds.

Claims (31)

  1. Process for forming stacks of sheet-shaped material (sheets) at a collection point and for conveying away the stacks which during this are supported on a lower face and are held against an upper face by a holding element, characterized in that a further stack arranged above the stack is also held by a further holding element which, after the stack has been conveyed away, is lowered with the further stack and, on conveying away of the further stack, holds the upper face thereof.
  2. Process according to Claim 1, characterized in that, after the stack has been conveyed away, the associated holding element is raised by at least one stack height and is brought into the separating position, in which it separates the further stack from further sheets accumulated to form a new stack.
  3. Process according to Claim 1 and/or 2, characterized in that a stack is supported at least on the largest part of its lower face but is held only on a relatively small part of its upper face.
  4. Process according to one or more of the preceding claims, characterized in that the stack is held in an edge zone of its upper face, preferably in the edge zone in the conveying direction.
  5. Process according to one or more of the preceding claims, characterized in that the stack is held on its upper face by a jaw which, after the stack has been formed, separates the latter from sheets accumulated above it.
  6. Process according to one or more of the preceding claims, characterized in that the jaws fulfil their separating and holding functions alternately, with one jaw not altering its position with respect to the stack below it until it is detached therefrom during conveying away.
  7. Process according to one or more of the preceding claims, characterized in that the lower face of a stack is supported on being carried away by belts which are carried away together with the stack and thereafter are driven to further remove the stack.
  8. Process for conveying a stack according to Claim 6 and/or 7, characterized in that the belts, during carrying away of the stack, at first are stationary relative to a carriage carrying them until the jaw, at first moved in association on the upper face of the stack, has detached itself from the stack, and in that thereafter the belts are driven with the stack relative to the carriage.
  9. Process according to one or more of the preceding claims, characterized in that the belts, after removal of the stack, are conveyed back to below the lower face of the further stack which has been lowered in the meantime, with belt sections bearing on the lower face of the further stack without relative motion in the conveying away direction with respect to the lower face of this further stack lowered into the conveying-away position.
  10. Process according to one or more of the preceding claims, characterized in that the further stack is supported at least on the largest part of its lower face while it is lowered into the conveying-away position.
  11. Process according to Claim 10, characterized in that the further stack is supported by a table from whose upper face compressed air flows.
  12. Process according to one or more of Claims 8 to 10, characterized in that the supporting belts and the supporting table are moved into the conveying-away position synchronously with one another, such that the belts support the stack which is conveyed away and the table supports the further stack.
  13. Process according to one or more of the preceding claims, characterized in that for better separation compressed air is blown in between the stacks.
  14. Process according to one or more the preceding claims, characterized in that the further stack located above the stack in the conveying-away position is held by a separating finger until it is lowered into the conveying-away position.
  15. Process according to one or more of the preceding claims, characterized in that the stack is pushed, while it is conveyed away, against a limiting surface remote from the conveying direction.
  16. Arrangement for forming and conveying away stacks (1, 51) of sheet-shaped material (sheets), having a collecting apparatus and a means of conveying away which has a movable base (9, 3) for the stack (1) and a movable holding element (53, 54) lying on the upper face of the stack, characterized in that there is provided for a further stack (51) arranged above the stack (1) a further holding element (63, 64) which is provided with a lowering apparatus (38) for lowering the further stack and the further holding element after the stack (1) in the conveying-away position (AP) has been conveyed away.
  17. Arrangement according to Claim 16, characterized by a lifting apparatus (59) for lifting a holding element after the stack (1) held by the holding element has been conveyed away by at least one stack height into a separating position in which it separates the further stack (51) from further sheets accumulated to form a new stack.
  18. Arrangement according to Claim 16 and/or 17, characterized in that the base is dimensioned such that it supports at least the largest part of the lower face of the stack, and in that the holding element only lies on a relatively small part of the stack upper face.
  19. Arrangement according to one or more of Claims 16 to 18, characterized in that the holding element only lies on an edge zone (RZ) of the stack upper face, preferably that in the conveying direction (FR).
  20. Arrangement according to one or more of Claims 16 to 19, characterized in that the holding element is constructed as a lower face of a holding jaw (53, 54).
  21. Arrangement according to one or more of Claims 16 to 21, characterized in that there are associated with the jaws (53, 54; 63) drives (58, 59; 66, 67) which are connected to a control arrangement (68, 69) such that the jaws fulfil their separating and holding functions alternately, with one jaw not altering its position with respect to the stack below it until it is detached therefrom during conveying away.
  22. Arrangement according to one or more of Claims 16 to 21, characterized in that the movable base (9) has belts which are drivable relative to the base.
  23. Arrangement according to one or more of Claims 16 to 22, characterized in that the base is constructed as a movable carriage (9).
  24. Arrangement according to Claim 22 and/or 23, characterized in that there is associated with the belts (3) a drive (11) which is inactive until the holding jaw (53) at the stack upper surface is raised away, so that the belts are at rest relative to the moved carriage (7), and which may be activated after raising away of the jaw, so that the belts are driven in the conveying direction (FR) relative to the moved carriage.
  25. Arrangement according to Claim 24, characterized in that the belts are guided via rotary rollers (4, 5) located on the carriage, whereof one roller (4) may be fixed, and via stationary rollers (6...8).
  26. Arrangement according to one or more of Claims 6 to 25, in particular according to Claim 24 and/or 25, characterized by a drive for a return motion of the belts after the stack (1) has been removed to below the lower face of the further stack (61) which has been lowered in the meantime, in which belt sections bear against the lower face of the further stack (51) successively during the return motion without relative motion in the direction of the return motion (RF).
  27. Arrangement according to one or more of Claims 22 to 26, characterized in that the lowering apparatus (33) has a table (26) with channels (29) located in the upper face, for outwardly flowing compressed air.
  28. Arrangement according to one or more of Claims 16 to 27, characterized in that the base (9) and the table (26) have a drive (13...17) for synchronous motion out of the conveying-away position (AP), with the base supporting the stack (1) which is conveyed away and the table supporting the further stack (51).
  29. Arrangement according to one or more of Claims 16 to 28, characterized in that at least one compressed-air source (57) is provided for blowing compressed air in between the stacks for the purpose of better separation.
  30. Arrangement according to one or more of Claims 16 to 29, characterized in that a separating finger (52) is provided for the further stack (51) located above the stack in the conveying-away position.
  31. Arrangement according to one or more of Claims 16 to 30, characterized by a slide (77) for the stack to be conveyed away, which during the conveying-away motion of the stack bears against a surface (78) remote from the conveying direction and assists conveying away.
EP87117539A 1986-12-11 1987-11-27 Method and device for forming piles from flat articles (sheets) Expired - Lifetime EP0270943B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3642259 1986-12-11
DE19863642259 DE3642259A1 (en) 1986-12-11 1986-12-11 METHOD AND ARRANGEMENT FOR FORMING STACKS OF LEAF-SHAPED MATERIAL (LEAVES)

Publications (2)

Publication Number Publication Date
EP0270943A1 EP0270943A1 (en) 1988-06-15
EP0270943B1 true EP0270943B1 (en) 1991-08-21

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Application Number Title Priority Date Filing Date
EP87117539A Expired - Lifetime EP0270943B1 (en) 1986-12-11 1987-11-27 Method and device for forming piles from flat articles (sheets)

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Country Link
US (1) US4878659A (en)
EP (1) EP0270943B1 (en)
JP (1) JPS63202561A (en)
DE (2) DE3642259A1 (en)

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Publication number Publication date
US4878659A (en) 1989-11-07
EP0270943A1 (en) 1988-06-15
JPS63202561A (en) 1988-08-22
DE3772340D1 (en) 1991-09-26
DE3642259A1 (en) 1988-06-23

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