EP0423065B1 - Pile unleader for removing a sub-pile from a pile of sheets - Google Patents

Pile unleader for removing a sub-pile from a pile of sheets Download PDF

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Publication number
EP0423065B1
EP0423065B1 EP90810688A EP90810688A EP0423065B1 EP 0423065 B1 EP0423065 B1 EP 0423065B1 EP 90810688 A EP90810688 A EP 90810688A EP 90810688 A EP90810688 A EP 90810688A EP 0423065 B1 EP0423065 B1 EP 0423065B1
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EP
European Patent Office
Prior art keywords
blade
stack
gripper
supporting element
respect
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
EP90810688A
Other languages
German (de)
French (fr)
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EP0423065A2 (en
EP0423065B2 (en
EP0423065A3 (en
Inventor
Willi Schneider
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.)
SCHNEIDER ENGINEERING
Original Assignee
SCHNEIDER ENGINEERING
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Application filed by SCHNEIDER ENGINEERING filed Critical SCHNEIDER ENGINEERING
Publication of EP0423065A2 publication Critical patent/EP0423065A2/en
Publication of EP0423065A3 publication Critical patent/EP0423065A3/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
    • B65H3/00—Separating articles from piles
    • B65H3/32—Separating articles from piles by elements, e.g. fingers, plates, rollers, inserted or traversed between articles to be separated and remainder of the pile
    • B65H3/322—Separating articles from piles by elements, e.g. fingers, plates, rollers, inserted or traversed between articles to be separated and remainder of the pile for separating a part of the pile, i.e. several articles at once
    • 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
    • B65H31/3036—Arrangements for removing completed piles by gripping the pile
    • B65H31/3045—Arrangements for removing completed piles by gripping the pile on the outermost articles of the pile for clamping the 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
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/422—Handling piles, sets or stacks of articles
    • B65H2301/4224—Gripping piles, sets or stacks of articles
    • B65H2301/42242—Gripping piles, sets or stacks of articles by acting on the outermost articles of the pile for clamping the 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
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/25—Damages to handled material

Definitions

  • the invention relates to an unstacking device for removing a partial stack from a stack of sheets standing on an airfoil, with a table top, a horizontal adjustment device for executing horizontal relative movements between the table top and said airfoil, a pair of pliers with an upper jaw and a lower part for grasping and Holding an edge of a partial stack and a vertical adjustment device for executing vertical relative movements between the table top and the pliers on the one hand and the supporting surface on the other.
  • the lower part of the pliers consists of a knife-like lower plier jaw, which can be inserted into a stack of sheets by horizontally displacing the pliers, while the upper plier jaw rests on and on top of the stack slides.
  • the tongs thus grip an edge of a partial stack of predetermined thickness, corresponding to the set distance from the upper jaw to the lower jaw.
  • the pliers can then be lifted to lift the detected partial stack edge from the remaining rest of the stack of sheets, and then the table top can be inserted between the partial stack and the remaining rest of the stack of sheets so that the partial stack lies on the table top.
  • a disadvantage of the known unstacking device is that individual blades can be damaged by the sharp edge and / or tip of the knife-like lower pincer jaw if the lower pincer jaw lifts a point on an edge of a relatively thick, heavy partial stack so far from the rest of the sheet stack that the table top can then be pushed between the partial stack and the rest of the stack of sheets.
  • the sharp edge and / or tip of the lower jaw of the pliers are essential so that they can be inserted into the stack of leaves.
  • the upper jaw of the tongs will shift the uppermost sheet or the uppermost sheets of the stack if it slides into the stack of sheets on the top of the stack when the lower tongs jaw is inserted.
  • the object of the invention is to design the unstacking device specified at the outset so that the disadvantages of the known unstacking device can be avoided and, in particular, the edge of relatively thick and heavy partial stacks can be lifted off without damaging the sheets.
  • the pliers lower part has a knife guide, a horizontal knife and a knife drive device for causing horizontal movements of the knife with respect to the knife guide, and in addition to the knife at least one support element and a support element adjusting device for executing horizontal movements of the support element with respect to the Knife guide contains and that the pliers also has a support element lifting device for executing vertical movements of the support element with respect to the knife.
  • the unstacking device In the unstacking device according to the invention, damage to the sheets by the knife when lifting a partial stack edge can be avoided if between the pliers with the knife and the support surface with the sheet stack after the knife has been inserted horizontally into the sheet stack with the upper jaw of the pliers resting on the top of the sheet stack , initially only a very small vertical relative movement is effected. The deflection of the partial stack edge at the edges and edges of the knife is then still small.
  • the partial stack lies at a comparatively small distance in front of the knife and laterally next to the knife on the remaining stack, so that the partial stack weight to be carried by the knife is not yet large.
  • the support elements can then be pushed next to the knife, which need not have sharp edges and can also be designed to be stronger than the knife.
  • the support elements can then be lifted with respect to the knife, so that the support elements then practically alone support the edge of the partial stack and clamp it against the upper jaw of the pliers with a predetermined force.
  • the knife can be withdrawn and a further vertical relative movement between the pliers and the support surface can be brought about with the stack of sheets in order to enlarge the gap between the partial stack edge and the remaining stack in the area of the pliers so that the gap can accommodate the table top.
  • a horizontal relative movement between the table top on the one hand and the support surface with the stack of sheets and the pliers on the other hand can be brought about by either moving the table top between the partial stack held by the pliers and the remaining stack or pulling the partial stack from the pliers onto the table top and at the same time the remaining stack is moved under the table top, so that the partial stack comes to rest completely on the table top.
  • the depacking device shown is used to remove a partial stack from a stack of sheets standing on a supporting surface by means of a table top 1.
  • the supporting surface can be the floor or the top of a pallet 2 lying on the floor, on which a stack of paper sheets 3 stands (FIG. 4).
  • the device contains a horizontal adjustment device for executing horizontal relative movements between the table top 1 and the supporting surface or the pallet 2.
  • the horizontal adjustment device in the device shown consists of a table guide 5 held on a machine stand 4 (FIG. 1), on which the table top 1 is horizontal is arranged displaceably, and from a drive means (not shown) for causing horizontal displacements of the table top along the table guide.
  • the pallet 2 could also be horizontally displaceable along a guide (not shown) by a drive means.
  • the device also contains a pair of pliers with an upper jaw 6 and a lower part 7 for gripping and holding a part of the stack of sheets 3 and a vertical adjustment device for executing vertical relative movements between the table top 1 and the pliers 6, 7 on the one hand and the pallet 2 on the other.
  • the vertical adjustment device consists of vertical guides (not shown) on the machine stand 4, along which the table guide 5 formed by a carriage can be moved vertically by a drive means, not shown.
  • the pallet 2 or a carrier for the same could also be guided such that it can be raised and lowered vertically along a vertical guide (not shown) by a drive means (not shown).
  • the pliers 6, 7 are carried by a pliers carrier 8 which, together with the table top 1, can be raised and lowered on the machine stand 4.
  • the tong holder 8 is preferably arranged on a second slide 9, which is also guided on the vertical guides of the machine stand 4 and which can be raised and lowered with respect to the table guide 5 formed by the first slide by a drive means (not shown).
  • the tong holder 8 can be arranged horizontally displaceably on the carriage 9 and can be displaced horizontally with respect to the carriage 9 by a drive means 10.
  • the lower part of the pliers 7 contains a knife guide 11 (FIGS. 2, 3) in which a horizontal knife 12 is guided so as to be horizontally displaceable.
  • a pneumatic cylinder 13 is fastened on the knife guide 11 and moves the knife 12 horizontally with respect to the knife guide 11 between the left end position according to FIG. 2 and a right end position. In the right end position, the free end of the knife 12 is retracted into the knife guide 11.
  • the knife guide 11 is attached to the lower end of a vertical rod 14, the upper end of which is attached to a circuit board 15.
  • the rod 14 is guided freely vertically displaceably in a block 16 fastened to the tong holder 8.
  • the downward movement of the rod 14 with respect to the tong holder 8 is limited by stop elements 18 and 19 carried by the circuit board 15, which interact with the upper side of the block 16 and the tong holder 8. While the stop element 18 is rigidly attached to the circuit board 15, the stop element 19 is carried by the plunger of a pneumatic cylinder 20 fastened on the circuit board 15. By actuating the pneumatic cylinder 20, the stop element 19 is moved downward with respect to the circuit board 15, as a result of which the lower end position of the circuit board 15 and the rod 14 is displaced upward with respect to the tong holder 8.
  • the board 15 also carries the upper jaw 6.
  • the vertical distance between the upper jaw 6 and the knife guide 11 or the knife 12 is adjustable, in the embodiment shown by turning a screw 21 rotatably mounted in the board 15 (FIG. 2) , which is screwed into a sleeve 22, at the lower end of which the upper jaw 6 is fixed.
  • the sleeve 22 must not rotate with the screw 21;
  • a tab 23 is attached to the sleeve 22, which is guided on the rod 14 to be vertically displaceable.
  • the lower part of the pliers 7 also contains at least one supporting element in addition to the knife 12.
  • a support element 24 or 25 (FIGS. 2, 3) is arranged on both sides of the knife 12.
  • the support elements 24 and 25 are guided horizontally displaceably in a support element guide 26.
  • a pneumatic cylinder 27 or 28 is attached to the support element guide 26 for each support element 24, 25, which holds the support element with respect to the support element guide 26 between the left end position shown in FIG. 2 and a right end position horizontally. In the right end position, the free ends of the support elements 24 and in the support element guide 26 are retracted.
  • the support element guide 26 and the pneumatic cylinders 27 and 28 form a support element adjusting device for executing horizontal movements of each support element with respect to the knife guide 11.
  • the support element guide 26 is guided so as to be vertically displaceable on the rod 14 carrying the knife guide 11, and on the circuit board 15 is a pneumatic cylinder 29 with a tie rod 30 (Fig. 2) attached to the lower end of the support member guide 26 is attached.
  • the pneumatic cylinder 29 and the means for guiding the support element guide 26 on the vertical rod 14 form an embodiment of a support element lifting device for executing vertical movements of the support elements 24 and 25 with respect to the knife 12.
  • the board 15 rests with the stop 18 on the block 16 of the tong holder 8, the table top 1 stands at any height at which a partial stack has previously been pushed away from it, next to that on the wing or pallet 2 (FIG 4) Standing stack of sheets.
  • the knife 12 of the lower part 7 of the pliers is retracted into the knife guide 11 and the support elements 24 and 25 are withdrawn into the support element guide 26.
  • a vertical relative movement between the table top 1 and the tong holder 8 on the one hand and the pallet 2 on the other hand is carried out, in the illustrated embodiment by lifting (or lowering) the table guide 5 along the vertical guides of the machine stand 4 until the upper jaw 6 as in FIG 4 is shown a certain distance higher than the top of the sheet stack 3. Reaching this height is determined by a photocell device 31 (FIG. 4) connected to the table top 1, which emits a signal when it is the top of the sheet stack 3 reached.
  • the pliers carrier 8 is moved horizontally to the left (or the wing 2 with the stack of leaves 3 to the right) until, as shown in FIG. 5, the upper jaw 6 stands vertically above the stack of leaves 3 and the knife guide 11 and the support element guide 26 in a small manner Stand next to the stack of sheets 3.
  • the tong holder 8 can be moved to the left by shifting with respect to the carriage 9 by means of the hydraulic cylinder 10 (FIG. 1); however, it could also be connected to the table top 1 so that it cannot be displaced horizontally and, together with this, can be moved to the left with respect to the table guide 5.
  • 5 can be indicated, for example, by a photocell device 32 (FIG. 3) arranged in the support element guide 26, which detects the distance between the support element guide 26 and the stack of sheets 3.
  • the predetermined contact force can be changed by weight loading or unloading means.
  • a compression spring 34 is shown schematically in FIG. 3, which is held in a sleeve 35 which is fastened in a height-adjustable manner in the circuit board 15 and the lower end of which rests on the upper side of the pliers carrier 8.
  • the compression spring 34 transmits a part of the weight of the board 15 and the parts carried by it directly to the pliers carrier 8.
  • the size of the part of this weight received by the compression spring 34 can be changed by adjusting the height of the sleeve 35 with respect to the board 15.
  • the pneumatic cylinder 13 (FIGS. 2, 3) is then actuated in order to stab the knife 12 horizontally into the stack of sheets 3, as shown in FIG. 7.
  • the puncture point lies a distance below the top of the sheet stack 3, which is equal to the vertical distance of the knife 12 from the upper pliers jaw 6 set by turning the screw 21 (FIG. 2). Because of the predetermined contact force of the upper jaw 6, this distance corresponds practically exactly to a certain number of individual sheets of the stack 3.
  • the circuit board 15 and thus the knife guide 11 and the rod 14 Knife 12 is raised by a first predetermined, small distance, for example by lifting the table guide 5 and the second slide 9 and thus the tong holder 8.
  • the knife 12 slightly lifts an area of the edge of a partial stack 3.1 adjacent to it from the remaining stack of sheets 3.2 as shown in FIG.
  • the support elements 24, 25 are then introduced into the gap formed in this way between an area of the edge of the partial stack 3.1 and the remaining stack 3.2, as shown in FIG. 9, by actuating the pneumatic cylinders 27, 28 (FIG. 3).
  • the support element lifting cylinder 29 by actuating the support element lifting cylinder 29, the support element guide 26 and thus the support elements 24 and 25 are moved upward with a predetermined force with respect to the knife guide 11 in order to clamp said area of the edge of the partial stack 3.1 against the upper jaw 6.
  • the support elements 24 and 25 are then, as shown in FIG. 10, higher than the knife 12 and only carry the edge of the partial stack 3.1.
  • the knife 12 is pulled back into the knife guide 11 by actuating the pneumatic cylinder 13.
  • the table guide 5 and the second carriage 9 are moved further up a second predetermined distance in order to make the gap between the support finger guide 26 or the knife guide 11 and the top of the remaining stack 3.2 by lifting the circuit board 15 to such an extent that the Table top 1 can be inserted into the gap, and to raise the table top 1 at the level of this gap, as shown in Fig. 11.
  • the table top 1 with the separating roller 36 also lifts the areas of the right edge of the partial stack 3.1 that are more distant from the support elements 24, 25, which areas initially still hang down (possibly up to the top of the remaining stack 3.2) onto the top of the table top . Simultaneously with the horizontal displacement of the table top 1 along the table guide 5, the table guide 5 - and with it also the second slide 9 - can be moved somewhat upwards along the machine stand 4, so that the separating roller 36 and the table top 1 rise obliquely into the gap run between the partial stack 3.1 and the remaining stack 3.2. 12, the table top 1 is shown inserted between the partial stack 3.1 and the remaining stack 3.2. The area of the right edge of the partial stack 3.1 in the area of the supporting elements 24, 25 is clamped between the supporting elements and the upper jaw 6, while the areas of the partial stack 3.1 which are more distant from the supporting elements 24, 25 now lie on the table top 1.
  • the pliers carrier 8 can now be moved to the right along the slide 9 by the hydraulic cylinder 10, so that the pliers 6, 7 continue to pull the partial stacks 3.1 onto the table top 1, as shown in FIG. 13.
  • the pneumatic cylinder 29 is then actuated in order to move the support element guide 26 and thus the support elements 24, 25 downward with respect to the knife guide 11 and the upper jaw 6, as shown in FIG. 14. As a result, the clamping of the edge of the partial stack 3.1 between the support elements 24, 25 and the upper jaw 6 is released.
  • the pneumatic cylinders 27 and 28 are then actuated to pull the support elements 24 and 25 away from under the edge of the partial stack 3.1, so that this edge of the partial stack 3.1 also falls on the table top 1, as shown in FIG. 15.
  • a vertical relative movement is then carried out between the board 15 and the table top 1 in order to raise the lower part 7 of the pliers above the height of the partial stack 3.1 lying on the table top 1, as shown in FIG. 16.
  • the pneumatic cylinder 20 is actuated for this purpose in order to adjust the circuit board 15 upwards with respect to the tong holder 8.
  • the tong holder 8 itself can also be moved upward by moving the second slide 9 (FIG. 1) with respect to the first slide 5 forming the table guide along the machine stand 4.
  • the partial stack 3.1 can then be pushed away from the table top 1.
  • the circuit board 15 is lowered again onto the tong holder 8 by actuating the pneumatic cylinder 20, and the second carriage 9 is possibly lowered onto the first carriage 5 again.
  • the unstacking device is then ready to remove a new partial stack from the remaining stack 3.2.
  • An additional advantage of the design and mode of operation of the unstacking device according to the invention is that the unstacking device can easily be removed for parallel processing of two (or even more) stacks of sheets at the same time.
  • the unstacking device shown in the drawings contains only a pair of pliers 6, 7 carried by a circuit board 15 for removing partial stacks from only one stack of sheets 3.
  • a second block 16 with a second pair of pliers 6, 7 can be spaced apart on the plier carrier 8 from and parallel to the first pliers 6, 7 and designed the same way as these.
  • the wing 2 e.g. Pallet, two sheets 3 stacked side by side.
  • the device then takes a partial stack of exactly the same number of sheets from both sheets. whereby both partial stacks come to lie on the table top 1 at the same time and are then pushed on by it.

Abstract

Two vertically displaceable slides (5, 9) carry in horizontally movable fashion a tabletop (1) and, respectively, a gripper with an upper gripper jaw (6) and a gripper base (7). The gripper base (7) contains a horizontally displaceable blade (12) and supporting elements (24, 25) which are horizontally displaceable and also vertically movable with respect to the blade (12). A Stack of sheets is set up in front of the tabletop (1). The slides (5, 9) are lowered until the upper gripper jaw (6) rests on the sheet stack. The blade (12), previously retracted into the gripper base (7), is then made to pierce the stack of sheets at an exactly settable distance below the upper gripper jaw (6). The slides (5, 9) are slightly elevated in order to form a gap in the sheet stack with the blade (12). The supporting elements (24, 25) are pushed into the gap below the blade (12), and are then urged upwardly past the level of the blade (12) so that they alone bear the weight of the sheets resting thereon. Upon further elevation of the slides (5, 9) until the tabletop (1) can be introduced into the gap, the blade (12) thus cannot damage the sheets.

Description

Die Erfindung bezieht sich auf ein Entstapelgerät zum Abnehmen eines Teilstapels von einem auf einer Tragfläche stehenden Blätterstapel, mit einer Tischplatte, einer Horizontalverstelleinrichtung zum Ausführen von horizontalen Relativbewegungen zwischen der Tischplatte und der genannten Tragfläche, einer eine obere Zangenbacke und einen Zangenunterteil aufweisenden Zange zum Erfassen und Halten eines Randes eines Teilstapels und einer Vertikalverstelleinrichtung zum Ausführen von vertikalen Relativbewegungen zwischen der Tischplatte und der Zange einerseits und der Tragfläche anderseits.The invention relates to an unstacking device for removing a partial stack from a stack of sheets standing on an airfoil, with a table top, a horizontal adjustment device for executing horizontal relative movements between the table top and said airfoil, a pair of pliers with an upper jaw and a lower part for grasping and Holding an edge of a partial stack and a vertical adjustment device for executing vertical relative movements between the table top and the pliers on the one hand and the supporting surface on the other.

In einem bekannten Entstapelgerät dieser Art (siehe CH-A-582 104) besteht der Zangenunterteil aus einer messerartigen unteren Zangenbacke, welche durch horizontales Verschieben der Zange in einen Blätterstapel eingestochen werden kann, während die obere Zangenbacke auf der Oberseite des Stapels aufliegt und auf dieser gleitet. Die Zange erfasst so einen Rand eines Teilstapels vorbestimmter Dicke, entsprechend dem eingestellten Abstand von der oberen Zangenbacke zur unteren Zangenbacke. Die Zange kann dann gehoben werden, um den erfassten Teilstapelrand vom verbleibenden Rest des Blätterstapels abzuheben, und dann kann die Tischplatte zwischen den Teilstapel und den verbleibenden Rest des Blätterstapels hineingeschoben werden, so dass sich der Teilstapel auf die Tischplatte legt.In a known unstacking device of this type (see CH-A-582 104), the lower part of the pliers consists of a knife-like lower plier jaw, which can be inserted into a stack of sheets by horizontally displacing the pliers, while the upper plier jaw rests on and on top of the stack slides. The tongs thus grip an edge of a partial stack of predetermined thickness, corresponding to the set distance from the upper jaw to the lower jaw. The pliers can then be lifted to lift the detected partial stack edge from the remaining rest of the stack of sheets, and then the table top can be inserted between the partial stack and the remaining rest of the stack of sheets so that the partial stack lies on the table top.

Ein Nachteil des bekannten Entstapelgerätes besteht darin, dass durch die scharfe Kante und/oder Spitze der messerartigen unteren Zangenbacke einzelne Blätter beschädigt werden können, wenn die untere Zangenbacke eine Stelle eines Randes eines relativ dicken, schweren Teilstapels so weit vom Rest des Blätterstapels abhebt, dass die Tischplatte anschliessend zwischen den Teilstapel und den Rest des Blätterstapels hineingeschoben werden kann. Die scharfe Kante und/oder Spitze der unteren Zangenbacke sind jedoch unerlässlich, damit diese in den Blätterstapel eingestochen werden kann. Ferner besteht in dem bekannten Entstapelgerät die Gefahr, dass die obere Zangenbacke das oberste Blatt oder die obersten Blätter des Stapels verschiebt, wenn sie beim Einstechen der unteren Zangenbacke in den Blätterstapel auf der Oberseite des Stapels gleitet.A disadvantage of the known unstacking device is that individual blades can be damaged by the sharp edge and / or tip of the knife-like lower pincer jaw if the lower pincer jaw lifts a point on an edge of a relatively thick, heavy partial stack so far from the rest of the sheet stack that the table top can then be pushed between the partial stack and the rest of the stack of sheets. However, the sharp edge and / or tip of the lower jaw of the pliers are essential so that they can be inserted into the stack of leaves. Furthermore, in the known unstacking device, there is a risk that the upper jaw of the tongs will shift the uppermost sheet or the uppermost sheets of the stack if it slides into the stack of sheets on the top of the stack when the lower tongs jaw is inserted.

Die Aufgabe der Erfindung besteht darin, das eingangs angegebene Entstapelgerät so auszubilden, dass die Nachteile des bekannten Entstapelgerätes vermieden werden können und insbesondere auch der Rand von relativ dicken und schweren Teilstapeln ohne Beschädigungen der Blätter abgehoben werden kann.The object of the invention is to design the unstacking device specified at the outset so that the disadvantages of the known unstacking device can be avoided and, in particular, the edge of relatively thick and heavy partial stacks can be lifted off without damaging the sheets.

Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass der Zangenunterteil eine Messerführung, ein horizontales Messer und eine Messerantriebseinrichtung zum Bewirken von horizontalen Bewegungen des Messers bezuglich der Messerführung sowie neben dem Messer wenigstens ein Tragelement und eine Tragelement-Verstelleinrichtung zum Ausführen von horizontalen Bewegungen des Tragelementes bezüglich der Messerführung enthält und dass die Zange ferner eine Tragelement-Hubeinrichtung zum Ausführen von vertikalen Bewegungen des Tragelementes bezüglich des Messers besitzt.The object is achieved according to the invention in that the pliers lower part has a knife guide, a horizontal knife and a knife drive device for causing horizontal movements of the knife with respect to the knife guide, and in addition to the knife at least one support element and a support element adjusting device for executing horizontal movements of the support element with respect to the Knife guide contains and that the pliers also has a support element lifting device for executing vertical movements of the support element with respect to the knife.

Im erfindungsgemässen Entstapelgerät lassen sich Beschädigungen der Blätter durch das Messer beim Abheben eines Teilstapelrandes vermeiden, wenn zwischen der Zange mit dem Messer und der Auflagefläche mit dem Blätterstapel, nachdem das Messer bei auf der Oberseite des Blätterstapels aufliegender oberer Zangenbacke in den Blätterstapel horizontal eingestochen worden ist, zunächst nur eine ganz kleine vertikale Relativbewegung bewirkt wird. Die Umlenkung des Teilstapelrandes an den Kanten und Rändern des Messers ist dann noch klein. Ausserdem liegt der Teilstapel in vergleichsweise kleinem Abstand vor dem Messer und seitlich neben dem Messer immer noch auf dem Reststapel auf, so dass das vom Messer zu tragende Teilstapelgewicht noch nicht gross ist. In den durch die kleine vertikale Relativbewegung gebildeten Spalt zwischen dem Teilstapelrand und dem Reststapel können dann neben dem Messer die Tragelemente geschoben werden, welche keine scharfen Kanten aufzuweisen brauchen und auch kräftiger ausgebildet sein können als das Messer. Anschliessend können die Tragelemente bezuglich des Messers gehoben werden, so dass die Tragelemente dann praktisch allein den Teilstapelrand tragen und ihn mit einer vorbestimmten Kraft gegen die obere Zangenbacke klemmen. Dann kann das Messer zurückgezogen werden und kann eine weitere vertikale Relativbewegung zwischen der Zange und der Auflagefläche mit dem Blätterstapel bewirkt werden, um den Spalt zwischen dem Teilstapelrand und dem Reststapel im Bereich der Zange so weit zu vergrössern, dass der Spalt die Tischplatte aufnehmen kann.In the unstacking device according to the invention, damage to the sheets by the knife when lifting a partial stack edge can be avoided if between the pliers with the knife and the support surface with the sheet stack after the knife has been inserted horizontally into the sheet stack with the upper jaw of the pliers resting on the top of the sheet stack , initially only a very small vertical relative movement is effected. The deflection of the partial stack edge at the edges and edges of the knife is then still small. In addition, the partial stack lies at a comparatively small distance in front of the knife and laterally next to the knife on the remaining stack, so that the partial stack weight to be carried by the knife is not yet large. In the gap formed by the small vertical relative movement between the edge of the partial stack and the remaining stack, the support elements can then be pushed next to the knife, which need not have sharp edges and can also be designed to be stronger than the knife. The support elements can then be lifted with respect to the knife, so that the support elements then practically alone support the edge of the partial stack and clamp it against the upper jaw of the pliers with a predetermined force. Then the knife can be withdrawn and a further vertical relative movement between the pliers and the support surface can be brought about with the stack of sheets in order to enlarge the gap between the partial stack edge and the remaining stack in the area of the pliers so that the gap can accommodate the table top.

Anschliessend kann dann eine horizontale Relativbewegung zwischen der Tischplatte einerseits und der Auflagefläche mit dem Blätterstapelsowie der Zange anderseits bewirkt werden, indem entweder die Tischplatte zwischen den von der Zange gehaltenen Teilstapel und den Reststapel eingefahren wird oder der Teilstapel von der Zange auf die Tischplatte gezogen wird und gleichzeitig der Reststapel unter die Tischplatte gefahren wird, so dass der Teilstapel vollständig auf die Tischplatte zu liegen kommt.Then a horizontal relative movement between the table top on the one hand and the support surface with the stack of sheets and the pliers on the other hand can be brought about by either moving the table top between the partial stack held by the pliers and the remaining stack or pulling the partial stack from the pliers onto the table top and at the same time the remaining stack is moved under the table top, so that the partial stack comes to rest completely on the table top.

Ein Ausführungsbeispiel des erfindungsgemässen Entstapelgerätes wird nachstehend anhand der Zeichnungen näher erläutert. In diesen zeigen:

  • Fig. 1 schematisch eine perspektivische Teilansicht eines Entstapelgerätes,
  • Fig. 2 in grösserem Massstab eine Seitenansicht der Zange des Entstapelgerätes, im Schnitt nach der Linie 11 - 11 in Fig. 3,
  • Fig. 3 eine Ansicht der Zange von links, im Schnitt nach der Linie 111 - 111 in Fig. 2,
  • Fig. 4 in kleinerem Massstab eine schematische Vorderansicht von Teilen des Entstapelgerätes und eines Blätterstapels, von dem ein Teilstapel abgenommen werden soll, und die
  • Fig. 5 bis 17 gleiche Ansichten wie Fig. 4 bei jeweils anderen Stellungen der Teile im Verlauf des Abnehmens eines Teilstapels.
An embodiment of the unstacking device according to the invention is explained in more detail below with reference to the drawings. In these show:
  • 1 schematically shows a perspective partial view of an unstacking device,
  • 2 on a larger scale a side view of the pliers of the unstacking device, in section along the line 11-11 in FIG. 3,
  • 3 is a view of the pliers from the left, in section along the line 111-111 in Fig. 2,
  • Fig. 4 on a smaller scale a schematic front view of parts of the unstacking device and a stack of sheets, from which a partial stack is to be removed, and
  • 5 to 17 the same views as FIG. 4 with different positions of the parts in the course of the removal of a partial stack.

Das dargestellte Entstapelgerät dient zum Abnehmen eines Teilstapels von einem auf einer Tragfläche stehenden Blätterstapel mittels einer Tischplatte 1. Die Tragfläche kann der Fussboden oder die Oberseite einer auf dem Fussboden liegenden Palette 2 sein, auf der ein Papierblätterstapel 3 steht (Fig. 4).The depacking device shown is used to remove a partial stack from a stack of sheets standing on a supporting surface by means of a table top 1. The supporting surface can be the floor or the top of a pallet 2 lying on the floor, on which a stack of paper sheets 3 stands (FIG. 4).

Das Gerät enthält eine Horizontalverstelleinrichtung zum Ausführen von horizontalen Relativbewegungen zwischen der Tischplatte 1 und der Tragfläche bzw. der Palette 2. Die Horizontalverstelleinrichtung besteht im dargestellten Gerät aus einer an einem Maschinenständer 4 gehaltenen Tischführung 5 (Fig. 1), an welcher die Tischplatte 1 horizontal verschiebbar angeordnet ist, und aus einem Antriebsmittel (nicht dargestellt) zum Bewirken von horizontalen Verschiebungen der Tischplatte längs der Tischführung. Stattdessen (oder zusätzlich) könnte aber auch die Palette 2 durch ein Antriebsmittel längs einer Führung (nicht dargestellt) horizontal verschiebbar sein.The device contains a horizontal adjustment device for executing horizontal relative movements between the table top 1 and the supporting surface or the pallet 2. The horizontal adjustment device in the device shown consists of a table guide 5 held on a machine stand 4 (FIG. 1), on which the table top 1 is horizontal is arranged displaceably, and from a drive means (not shown) for causing horizontal displacements of the table top along the table guide. Instead (or in addition), the pallet 2 could also be horizontally displaceable along a guide (not shown) by a drive means.

Das Gerät enthält ferner eine Zange mit einer oberen Zangenbacke 6 und einem Zangenunterteil 7 zum Erfassen und Festhalten eines Teilstapels von dem Blätterstapel 3 sowie eine Vertikalverstelleinrichtung zum Ausführen von vertikalen Relativbewegungen zwischen der Tischplatte 1 und der Zange 6, 7 einerseits und der Palette 2 anderseits. Die Vertikalverstelleinrichtung besteht im dargestellten Gerät aus vertikalen Führungen (nicht dargestellt) am Maschinenständer 4, längs denen die von einem Schlitten gebildete Tischführung 5 durch ein nicht dargestelltes Antriebsmittel vertikal verschiebbar ist. Stattdessen (oder zusätzlich) könnte aber auch die Palette 2 oder ein Träger für dieselbe längs einer nicht dargestellten vertikalen Führung durch ein nicht dargestelltes Antriebsmittel vertikal heb- und senkbar geführt sein.The device also contains a pair of pliers with an upper jaw 6 and a lower part 7 for gripping and holding a part of the stack of sheets 3 and a vertical adjustment device for executing vertical relative movements between the table top 1 and the pliers 6, 7 on the one hand and the pallet 2 on the other. In the device shown, the vertical adjustment device consists of vertical guides (not shown) on the machine stand 4, along which the table guide 5 formed by a carriage can be moved vertically by a drive means, not shown. Instead (or in addition), however, the pallet 2 or a carrier for the same could also be guided such that it can be raised and lowered vertically along a vertical guide (not shown) by a drive means (not shown).

Die Zange 6, 7 ist von einem Zangenträger 8 getragen, der gemeinsam mit der Tischplatte 1 heb- und senkbar am Maschinenständer 4 angeordnet ist. Vorzugsweise ist der Zangenträger 8 an einem zweiten Schlitten 9 angeordnet, der ebenfalls an den vertikalen Führungen des Maschinenständers 4 geführt ist und der bezüglich der vom ersten Schlitten gebildeten Tischführung 5 durch ein Antriebsmittel (nicht dargestellt) heb- und senkbar ist. Dabei kann der Zangenträger 8 am Schlitten 9 horizontal verschiebbar angeordnet sein und durch ein Antriebsmittel 10 bezüglich des Schlittens 9 horizontal verschoben werden.The pliers 6, 7 are carried by a pliers carrier 8 which, together with the table top 1, can be raised and lowered on the machine stand 4. The tong holder 8 is preferably arranged on a second slide 9, which is also guided on the vertical guides of the machine stand 4 and which can be raised and lowered with respect to the table guide 5 formed by the first slide by a drive means (not shown). The tong holder 8 can be arranged horizontally displaceably on the carriage 9 and can be displaced horizontally with respect to the carriage 9 by a drive means 10.

Der Zangenunterteil 7 enthält eine Messerführung 11 (Fig. 2, 3), in der ein horizontales Messer 12 horizontal verschiebbar geführt ist. Auf der Messerführung 11 ist ein Pneumatikzylinder 13 befestigt, der das Messer 12 bezüglich der Messerführung 11 zwischen der linken Endlage gemäss Fig. 2 und einer rechten Endlage horizontal verschiebt. In der rechten Endlage ist das freie Ende des Messers 12 in die Messerführung 11 zurückgezogen. Die Messerführung 11 ist am unteren Ende einer vertikalen Stange 14 befestigt, deren oberes Ende an einer Platine 15 befestigt ist. Die Stange 14 ist in einem am Zangenträger 8 befestigten Block 16 frei vertikal verschiebbar geführt. Die Abwärtsbewegung der Stange 14 bezüglich des Zangenträgers 8 ist durch von der Platine 15 getragene Anschlagelemente 18 und 19 begrenzt, die mit der Oberseite des Blockes 16 bzw. des Zangenträgers 8 zusammenwirken. Während das Anschlagelement 18 starr an der Platine 15 befestigt ist, ist das Anschlagelement 19 vom Stössel eines auf der Platine 15 befestigten Pneumatikzylinders 20 getragen. Durch Betätigen des Pneumatikzylinders 20 wird das Anschlagelement 19 bezüglich der Platine 15 nach unten bewegt, wodurch die untere Endlage der Platine 15 und der Stange 14 bezüglich des Zangenträgers 8 nach oben verstellt wird. Die Platine 15 trägt auch die obere Zangenbacke 6. Der vertikale Abstand zwischen der oberen Zangenbakke 6 und der Messerführung 11 bzw. dem Messer 12 ist einstellbar, in der dargestellten Ausführungsform durch Drehen einer in der Platine 15 drehbar gelagerten Schraube 21 (Fig. 2), die in eine Hülse 22 geschraubt ist, an deren unterem Ende die obere Zangenbacke 6 befestigt ist. Natürlich darf sich die Hülse 22 nicht mit der Schraube 21 drehen; um das zu erreichen, ist auf der Hülse 22 eine Lasche 23 befestigt, welche auf der Stange 14 vertikal verschiebbar geführt ist.The lower part of the pliers 7 contains a knife guide 11 (FIGS. 2, 3) in which a horizontal knife 12 is guided so as to be horizontally displaceable. A pneumatic cylinder 13 is fastened on the knife guide 11 and moves the knife 12 horizontally with respect to the knife guide 11 between the left end position according to FIG. 2 and a right end position. In the right end position, the free end of the knife 12 is retracted into the knife guide 11. The knife guide 11 is attached to the lower end of a vertical rod 14, the upper end of which is attached to a circuit board 15. The rod 14 is guided freely vertically displaceably in a block 16 fastened to the tong holder 8. The downward movement of the rod 14 with respect to the tong holder 8 is limited by stop elements 18 and 19 carried by the circuit board 15, which interact with the upper side of the block 16 and the tong holder 8. While the stop element 18 is rigidly attached to the circuit board 15, the stop element 19 is carried by the plunger of a pneumatic cylinder 20 fastened on the circuit board 15. By actuating the pneumatic cylinder 20, the stop element 19 is moved downward with respect to the circuit board 15, as a result of which the lower end position of the circuit board 15 and the rod 14 is displaced upward with respect to the tong holder 8. The board 15 also carries the upper jaw 6. The vertical distance between the upper jaw 6 and the knife guide 11 or the knife 12 is adjustable, in the embodiment shown by turning a screw 21 rotatably mounted in the board 15 (FIG. 2) , which is screwed into a sleeve 22, at the lower end of which the upper jaw 6 is fixed. Of course, the sleeve 22 must not rotate with the screw 21; To achieve this, a tab 23 is attached to the sleeve 22, which is guided on the rod 14 to be vertically displaceable.

Der Zangenunterteil 7 enthält ferner neben dem Messer 12 wenigstens ein Tragelement. In der dargestellten Ausführungsform ist auf beiden Seiten des Messers 12 je ein Tragelement 24 bzw. 25 (Fig. 2, 3) angeordnet. Die Tragelemente 24 und 25 sind in einer Tragelementführung 26 horizontal verschiebbar geführt. Auf der Tragelementführung 26 ist für jedes Tragelement 24, 25 je ein Pneumatikzylinder 27 bzw. 28 befestigt, der das Tragelement bezüglich der Tragelementführung 26 zwischen der linken Endlage gemäss Fig. 2 und einer rechten Endlage horizontal verschiebt. In der rechten Endlage sind die freien Enden der Tragelemente 24 und in die Tragelementführung 26 zurückgezogen. Die Tragelementführung 26 und die Pneumatikzylinder 27 und 28 bilden eine Tragelement-Verstelleinrichtung zum Ausführen von horizontalen Bewegungen jedes Tragelementes bezüglich der Messerführung 11. Die Tragelementführung 26 ist auf der die Messerführung 11 tragenden Stange 14 vertikal verschiebbar geführt, und auf der Platine 15 ist ein Pneumatikzylinder 29 mit einer Zugstange 30 (Fig. 2) befestigt, an deren unterem Ende die Tragelementführung 26 befestigt ist. Der Pneumatikzylinder 29 und die Mittel zum Führen der Tragelementführung 26 an der vertikalen Stange 14 bilden eine Ausführungsform einer Tragelement-Hubeinrichtung zum Ausführen von vertikalen Bewegungen der Tragelemente 24 und 25 bezüglich des Messers 12.The lower part of the pliers 7 also contains at least one supporting element in addition to the knife 12. In the illustrated embodiment, a support element 24 or 25 (FIGS. 2, 3) is arranged on both sides of the knife 12. The support elements 24 and 25 are guided horizontally displaceably in a support element guide 26. A pneumatic cylinder 27 or 28 is attached to the support element guide 26 for each support element 24, 25, which holds the support element with respect to the support element guide 26 between the left end position shown in FIG. 2 and a right end position horizontally. In the right end position, the free ends of the support elements 24 and in the support element guide 26 are retracted. The support element guide 26 and the pneumatic cylinders 27 and 28 form a support element adjusting device for executing horizontal movements of each support element with respect to the knife guide 11. The support element guide 26 is guided so as to be vertically displaceable on the rod 14 carrying the knife guide 11, and on the circuit board 15 is a pneumatic cylinder 29 with a tie rod 30 (Fig. 2) attached to the lower end of the support member guide 26 is attached. The pneumatic cylinder 29 and the means for guiding the support element guide 26 on the vertical rod 14 form an embodiment of a support element lifting device for executing vertical movements of the support elements 24 and 25 with respect to the knife 12.

Mit dem Entstapelgerät können von einem Blätterstapel 3 (Fig. 4), der auf einer Tragfläche steht, z.B. auf der Palette 2, Teilstapel genau vorwählbarer Dicke bzw. Blattzahl in der nachstehend anhand der Fig. 4 bis 17 beschriebenen Weise abgenommen werden. Die nachstehend beschriebenen Vorgänge werden von einer nicht dargestellten Steuereinrichtung, welche die entsprechenden Antriebsmittel steuert, automatisch durchgeführt.With the unstacking device, a stack of sheets 3 (Fig. 4) standing on an airfoil, e.g. on the pallet 2, partial stacks of precisely preselectable thickness or number of sheets are removed in the manner described below with reference to FIGS. 4 to 17. The operations described below are carried out automatically by a control device, not shown, which controls the corresponding drive means.

Im Ruhezustand liegt die Platine 15 mit dem Anschlag 18 auf dem Block 16 des Zangenträgers 8 auf, die Tischplatte 1 steht auf irgend einer Höhe, auf der vorher ein Teilstapel von ihr weggeschoben worden ist, neben dem auf der Tragfläche bzw. Palette 2 (Fig. 4) stehenden Blätterstapel. Das Messer 12 des Zangenunterteils 7 ist in die Messerführung 11 zurückgezogen, und die Tragelemente 24 und 25 sind in die Tragelementführung 26 zurückgezogen.In the idle state, the board 15 rests with the stop 18 on the block 16 of the tong holder 8, the table top 1 stands at any height at which a partial stack has previously been pushed away from it, next to that on the wing or pallet 2 (FIG 4) Standing stack of sheets. The knife 12 of the lower part 7 of the pliers is retracted into the knife guide 11 and the support elements 24 and 25 are withdrawn into the support element guide 26.

Zuerst wird nötigenfalls eine vertikale Relativbewegung zwischen der Tischplatte 1 sowie dem Zangenträger 8 einerseits und der Palette 2 anderseits ausgeführt, in der dargestellten Ausführungsform durch Heben (oder Senken) der Tischführung 5 längs der vertikalen Führungen des Maschinenständers 4, bis die obere Zangenbacke 6 wie in Fig. 4 dargestellt um eine bestimmte Strecke höher steht als die Oberseite des Blätterstapels 3. Das Erreichen dieser Höhe wird von einer mit der Tischplatte 1 verbundenen Fotozelleneinrichtung 31 (Fig. 4) festgestellt, die ein Signal abgibt, wenn sie die Oberseite des Blätterstapels 3 erreicht.First, if necessary, a vertical relative movement between the table top 1 and the tong holder 8 on the one hand and the pallet 2 on the other hand is carried out, in the illustrated embodiment by lifting (or lowering) the table guide 5 along the vertical guides of the machine stand 4 until the upper jaw 6 as in FIG 4 is shown a certain distance higher than the top of the sheet stack 3. Reaching this height is determined by a photocell device 31 (FIG. 4) connected to the table top 1, which emits a signal when it is the top of the sheet stack 3 reached.

Dann wird wenigstens der Zangenträger 8 horizontal nach links bewegt (oder die Tragfläche 2 mit dem Blätterstapel 3 nach rechts), bis wie in Fig. 5 gezeigt die obere Zangenbacke 6 vertikal über dem Blätterstapel 3 steht und die Messerführung 11 sowie die Tragelementführung 26 in kleinem Abstand neben dem Blätterstapel 3 stehen. Der Zangenträger 8 kann durch Verschieben bezüglich des Schlittens 9 mittels des Hydraulikzylinders 10 (Fig. 1) nach links bewegt werden; er könnte aber auch horizontal unverschiebbar mit der Tischplatte 1 verbunden sein und gemeinsam mit dieser bezüglich der Tischführung 5 nach links bewegt werden. Das Erreichen der Stellung gemäss Fig. 5 kann beispielsweise von einer in der Tragelementführung 26 angeordneten Fotozelleneinrichtung 32 (Fig. 3) angezeigt werden, welche den Abstand zwischen der Tragelementführung 26 und dem Blätterstapel 3 feststellt.Then at least the pliers carrier 8 is moved horizontally to the left (or the wing 2 with the stack of leaves 3 to the right) until, as shown in FIG. 5, the upper jaw 6 stands vertically above the stack of leaves 3 and the knife guide 11 and the support element guide 26 in a small manner Stand next to the stack of sheets 3. The tong holder 8 can be moved to the left by shifting with respect to the carriage 9 by means of the hydraulic cylinder 10 (FIG. 1); however, it could also be connected to the table top 1 so that it cannot be displaced horizontally and, together with this, can be moved to the left with respect to the table guide 5. 5 can be indicated, for example, by a photocell device 32 (FIG. 3) arranged in the support element guide 26, which detects the distance between the support element guide 26 and the stack of sheets 3.

Dann wird wieder eine vertikale Relativbewegung zwischen der Tischplatte 1 und dem Zangenträger 8 einerseits und der Palette 2 anderseits ausgeführt, in der dargestellten Ausführungsform durch Senken der Tischführung 5 und des zweiten Schlittens 9 längs dem Maschinenständer 4, bis die obere Zangenbacke 6 wie in Fig. 6 gezeigt auf der Oberseite des Blätterstapels 3 aufliegt. Wenn die Oberseite des Blätterstapels 3 mit der oberen Zangenbacke 6 in Berührung kommt, hebt sie über diese die Platine 15 mit dem Anschlag 18 geringfügig vom Block 16 ab. Das wird von einem im Block 16 angeordneten Schalter 33 (Fig. 2, 3) festgestellt, der die Abwärtsbewegung der beiden Schlitten 5 und 9 stoppt. Die obere Zangenbacke 6 liegt nun mit einer vorbestimmten Kraft, entsprechend dem Gewicht der Platine 15 und der an dieser befestigten Teile, auf dem Blätterstapel 3 auf. Gewünschtenfalls kann man die vorbestimmte Auflagekraft durch Gewichtsbelastungs- oder -entlastungsmittel ändern. Als Beispiel für ein solches Mittel ist in Fig. 3 schematisch eine Druckfeder 34 dargestellt, die in einer in der Platine 15 höhenverstellbar befestigten Hülse 35 gehalten ist und deren unteres Ende auf der Oberseite des Zangenträgers 8 aufliegt. Die Druckfeder 34 überträgt einen Teil des Gewichtes der Platine 15 und der von dieser getragenen Teile direkt auf den Zangenträger 8. Die Grösse des von der Druckfeder 34 aufgenommenen Teils dieses Gewichtes kann durch Höhenverstellung der Hülse 35 bezüglich der Platine 15 geändert werden.Then again a vertical relative movement between the table top 1 and the tong holder 8 on the one hand and the pallet 2 on the other hand is carried out, in the embodiment shown by lowering the table guide 5 and the second slide 9 along the machine stand 4 until the upper jaw 6 as in Fig. 6 shown on the top of the sheet stack 3 rests. When the top of the stack of sheets 3 comes into contact with the upper jaw 6, it lifts the board 15 with the stop 18 slightly from the block 16. This is determined by a switch 33 (FIGS. 2, 3) arranged in block 16, which stops the downward movement of the two slides 5 and 9. The upper jaw 6 now rests on the sheet stack 3 with a predetermined force, corresponding to the weight of the board 15 and the parts attached to it. If desired, the predetermined contact force can be changed by weight loading or unloading means. As an example of such a means, a compression spring 34 is shown schematically in FIG. 3, which is held in a sleeve 35 which is fastened in a height-adjustable manner in the circuit board 15 and the lower end of which rests on the upper side of the pliers carrier 8. The compression spring 34 transmits a part of the weight of the board 15 and the parts carried by it directly to the pliers carrier 8. The size of the part of this weight received by the compression spring 34 can be changed by adjusting the height of the sleeve 35 with respect to the board 15.

Danach wird der Pneumatikzylinder 13 (Fig. 2, 3) betätigt, um das Messer 12 wie in Fig. 7 gezeigt horizontal in den Blätterstapel 3 einzustechen. Die Einstechstelle liegt um eine Strecke unter der Oberseite des Blätterstapels 3, die gleich dem durch Drehen der Schraube 21 (Fig. 2) eingestellten vertikalen Abstand des Messers 12 von der oberen Zangenbacke 6 ist. Dieser Strecke entspricht wegen der vorbestimmten Auflagekraft der oberen Zangenbacke 6 praktisch genau eine bestimmte Zahl von Einzelblättern des Stapels 3.The pneumatic cylinder 13 (FIGS. 2, 3) is then actuated in order to stab the knife 12 horizontally into the stack of sheets 3, as shown in FIG. 7. The puncture point lies a distance below the top of the sheet stack 3, which is equal to the vertical distance of the knife 12 from the upper pliers jaw 6 set by turning the screw 21 (FIG. 2). Because of the predetermined contact force of the upper jaw 6, this distance corresponds practically exactly to a certain number of individual sheets of the stack 3.

Anschliessend werden die Platine 15 und damit über die Stange 14 die Messerführung 11 und das Messer 12 um eine erste vorbestimmte, kleine Strecke gehoben, z.B. durch Heben der Tischführung 5 und des zweiten Schlittens 9 und damit des Zangenträgers 8. Durch diese Aufwärtsbewegung hebt das Messer 12 einen ihm benachbarten Bereich des Randes eines Teilstapels 3.1 geringfügig vom restlichen Blätterstapel 3.2 ab, wie in Fig. 8 gezeigt.Then the circuit board 15 and thus the knife guide 11 and the rod 14 Knife 12 is raised by a first predetermined, small distance, for example by lifting the table guide 5 and the second slide 9 and thus the tong holder 8. By this upward movement, the knife 12 slightly lifts an area of the edge of a partial stack 3.1 adjacent to it from the remaining stack of sheets 3.2 as shown in FIG.

In den so gebildeten Spalt zwischen einem Bereich des Randes des Teilstapels 3.1 und dem Reststapel 3.2 werden dann wie in Fig. 9 gezeigt durch Betätigen der Pneumatikzylinder 27, 28 (Fig. 3) die Tragelemente 24, 25 eingeführt.The support elements 24, 25 are then introduced into the gap formed in this way between an area of the edge of the partial stack 3.1 and the remaining stack 3.2, as shown in FIG. 9, by actuating the pneumatic cylinders 27, 28 (FIG. 3).

Anschliessend werden durch Betätigen des Tragelement-Hubzylinders 29 die Tragelementführung 26 und damit die Tragelemente 24 und 25 mit einer vorbestimmten Kraft bezüglich der Messerführung 11 nach oben bewegt, um den genannten Bereich des Randes des Teilstapels 3.1 gegen die obere Zangenbacke 6 festzuklemmen. Die Tragelemente 24 und 25 liegen danach wie in Fig. 10 gezeigt höher als das Messer 12 und tragen allein den Rand des Teilstapels 3.1.Subsequently, by actuating the support element lifting cylinder 29, the support element guide 26 and thus the support elements 24 and 25 are moved upward with a predetermined force with respect to the knife guide 11 in order to clamp said area of the edge of the partial stack 3.1 against the upper jaw 6. The support elements 24 and 25 are then, as shown in FIG. 10, higher than the knife 12 and only carry the edge of the partial stack 3.1.

Danach wird das Messer 12 durch Betätigen des Pneumatikzylinders 13 in die Messerführung 11 zurückgezogen. Dann werden die Tischführung 5 und der zweite Schlitten 9 weiter um eine zweite vorbestimmte Strecke nach oben bewegt, um durch Heben der Platine 15 den Spalt zwischen der Tragfingerführung 26 bzw. der Messerführung 11 und der Oberseite des Reststapels 3.2 so weit zu machen, dass die Tischplatte 1 in den Spalt eingeführt werden kann, und um die Tischplatte 1 auf die Höhe dieses Spaltes zu heben, wie in Fig. 11 gezeigt.Then the knife 12 is pulled back into the knife guide 11 by actuating the pneumatic cylinder 13. Then the table guide 5 and the second carriage 9 are moved further up a second predetermined distance in order to make the gap between the support finger guide 26 or the knife guide 11 and the top of the remaining stack 3.2 by lifting the circuit board 15 to such an extent that the Table top 1 can be inserted into the gap, and to raise the table top 1 at the level of this gap, as shown in Fig. 11.

Dann wird eine horizontale Relativbewegung zwischen der Tischplatte 1 einerseits und der Palette 2 sowie dem Zangenträger 8 anderseits ausgeführt, in der dargestellten Ausführungsform der Erfindung dadurch, dass die Tischplatte 1 längs der Tischführung 5 horizontal nach links verschoben wird. Die Tischplatte 1 tritt mit ihrem linken Rand, vor welchem vorzugsweise eine drehbare Trennwalze 36 angeordnet ist, die nun angetrieben wird, in den Spalt zwischen dem von den Tragelementen 24 und 25 getragenen Bereich des Randes des Teilstapels 3.1 und der Oberseite des Reststapels 3.2. Die Tischplatte 1 mit der Trennwalze 36 hebt dabei auch die von den Tragelementen 24, 25 entfernteren Bereiche des rechten Randes des Teilstapels 3.1, welche Bereiche zunächst noch nach unten hängen (unter Umständen bis auf die Oberseite des Reststapels 3.2), auf die Oberseite der Tischplatte. Gleichzeitig mit dem horizontalen Verschieben der Tischplatte 1 längs der Tischführung 5 kann die Tischführung 5 - und mit dieser auch der zweite Schlitten 9 - längs des Maschinenständers 4 etwas nach oben bewegt werden, so dass die Trennwalze 36 und die Tischplatte 1 schräg ansteigend in den Spalt zwischen dem Teilstapel 3.1 und dem Reststapel 3.2 hineinlaufen. In Fig. 12 ist die Tischplatte 1 zwischen den Teilstapel 3.1 und den Reststapel 3.2 eingeführt dargestellt. Der im Bereich der Tragelemente 24, 25 liegende Bereich des rechten Randes des Teilstapels 3.1 ist zwischen den Tragelementen und der oberen Zangenbacke 6 festgeklemmt, während die von den Tragelementen 24, 25 entfernteren Bereiche des Teilstapels 3.1 nun auf der Tischplatte 1 liegen.Then a horizontal relative movement between the table top 1 on the one hand and the pallet 2 and the tong holder 8 on the other hand is carried out, in the illustrated embodiment of the invention in that the table top 1 is horizontally displaced along the table guide 5 to the left. With its left edge, in front of which a rotatable separating roller 36, which is now driven, is arranged, the table top 1 enters the gap between the area of the edge of the partial stack 3.1 carried by the supporting elements 24 and 25 and the top of the remaining stack 3.2. The table top 1 with the separating roller 36 also lifts the areas of the right edge of the partial stack 3.1 that are more distant from the support elements 24, 25, which areas initially still hang down (possibly up to the top of the remaining stack 3.2) onto the top of the table top . Simultaneously with the horizontal displacement of the table top 1 along the table guide 5, the table guide 5 - and with it also the second slide 9 - can be moved somewhat upwards along the machine stand 4, so that the separating roller 36 and the table top 1 rise obliquely into the gap run between the partial stack 3.1 and the remaining stack 3.2. 12, the table top 1 is shown inserted between the partial stack 3.1 and the remaining stack 3.2. The area of the right edge of the partial stack 3.1 in the area of the supporting elements 24, 25 is clamped between the supporting elements and the upper jaw 6, while the areas of the partial stack 3.1 which are more distant from the supporting elements 24, 25 now lie on the table top 1.

Nun kann gewünschtenfalls der Zangenträger 8 durch den Hydraulikzylinder 10 längs des Schlittens 9 nach rechts verschoben werden, so dass die Zange 6, 7 die Teilstapel 3.1 weiter auf die Tischplatte 1 zieht, wie in Fig. 13 dargestellt.If desired, the pliers carrier 8 can now be moved to the right along the slide 9 by the hydraulic cylinder 10, so that the pliers 6, 7 continue to pull the partial stacks 3.1 onto the table top 1, as shown in FIG. 13.

Dann wird der Pneumatikzylinder 29 betätigt, um die Tragelementführung 26 und damit die Tragelemente 24, 25 bezüglich der Messerführung 11 und der oberen Zangenbacke 6 wieder nach unten zu bewegen, wie in Fig. 14 dargestellt. Dadurch wird die Klemmung des Randes des Teilstapels 3.1 zwischen den Tragelementen 24, 25 und der oberen Zangenbacke 6 aufgehoben.The pneumatic cylinder 29 is then actuated in order to move the support element guide 26 and thus the support elements 24, 25 downward with respect to the knife guide 11 and the upper jaw 6, as shown in FIG. 14. As a result, the clamping of the edge of the partial stack 3.1 between the support elements 24, 25 and the upper jaw 6 is released.

Danach werden die Pneumatikzylinder 27 und 28 betätigt, um die Tragelemente 24 und 25 unter dem Rand des Teilstapels 3.1 wegzuziehen, so dass auch dieser Rand des Teilstapels 3.1 auf die Tischplatte 1 fällt, wie in Fig. 15 gezeigt.The pneumatic cylinders 27 and 28 are then actuated to pull the support elements 24 and 25 away from under the edge of the partial stack 3.1, so that this edge of the partial stack 3.1 also falls on the table top 1, as shown in FIG. 15.

Anschliessend wird eine vertikale Relativbewegung zwischen der Platine 15 und der Tischplatte 1 ausgeführt, um den Zangenunterteil 7 über die Höhe des auf der Tischplatte 1 liegenden Teilstapels 3.1 zu heben, wie in Fig. 16 dargestellt. In der dargestellten Ausführungsform wird zu diesem Zweck der Pneumatikzylinder 20 betätigt, um die Platine 15 bezüglich des Zangenträgers 8 nach oben zu verstellen. Zusätzlich kann auch noch der Zangenträger 8 selbst nach oben bewegt werden, indem der zweite Schlitten 9 (Fig. 1) bezüglich des die Tischführung bildenden ersten Schlittens 5 längs des Maschinenständers 4 nach oben bewegt wird.A vertical relative movement is then carried out between the board 15 and the table top 1 in order to raise the lower part 7 of the pliers above the height of the partial stack 3.1 lying on the table top 1, as shown in FIG. 16. In the embodiment shown, the pneumatic cylinder 20 is actuated for this purpose in order to adjust the circuit board 15 upwards with respect to the tong holder 8. In addition, the tong holder 8 itself can also be moved upward by moving the second slide 9 (FIG. 1) with respect to the first slide 5 forming the table guide along the machine stand 4.

Eine erneute horizontale Relativbewegung zwischen der Tischplatte 1 und der Palette 2 - durch horizontales Verschieben der Tischplatte 1 längs der Tischführung 5 - bringt dann die Tischplatte 1 in ihre Ausgangslage bezüglich des Reststapels 3.2 zurück, wie in Fig. 17 gezeigt. Der Teilstapel 3.1 kann dann von der Tischplatte 1 weggeschoben werden. Danach wird die Platine 15 wieder auf den Zangenträger 8 gesenkt, durch Betätigen des Pneumatikzylinders 20, und wird ggf. der zweite Schlitten 9 wieder auf den ersten Schlitten 5 gesenkt. Das Entstapelgerät ist dann wieder bereit zum Abnehmen eines neuen Teilstapels vom Reststapel 3.2.A renewed horizontal relative movement between the table top 1 and the pallet 2 - by horizontally shifting the table top 1 along the table guide 5 - then brings the table top 1 back to its starting position with respect to the remaining stack 3.2, as shown in FIG. 17. The partial stack 3.1 can then be pushed away from the table top 1. Thereafter, the circuit board 15 is lowered again onto the tong holder 8 by actuating the pneumatic cylinder 20, and the second carriage 9 is possibly lowered onto the first carriage 5 again. The unstacking device is then ready to remove a new partial stack from the remaining stack 3.2.

Ein zusätzlicher Vorteil der Konstruktion und Betriebsweise des erfindungsgemässen Entstapelgerätes besteht darin, dass das Entstapelgerät ohne weiteres für die parallele Bearbeitung von gleichzeitig zwei (oder auch mehr) Blätterstapeln ausgebaut werden kann. Das in den Zeichnungen dargestellte Entstapelgerät enthält nur eine von einer Platine 15 getragene Zange 6, 7 zum Abnehmen von Teilstapeln von nur einem Blätterstapel 3. Man kann aber an dem Zangenträger 8 ohne weiteres einen zweiten Block 16 mit einer zweiten Zange 6, 7 im Abstand von und parallel zu der ersten Zange 6, 7 und gleich ausgebildet wie diese anordnen. Dann können auf der Tragfläche 2, z.B. Palette, nebeneinander zwei Blätterstapel 3 aufgestellt werden. Wenn dann die Tischplatte 1 die beschriebenen Bewegungen ausführt und dabei die Pneumatikzylinder 13, 27, 28, 29 und 20 der beiden Zangen jeweils gleichzeitig in der beschriebenen Weise betätigt werden, dann nimmt das Gerät von beiden Blätterstapeln gleichzeitig je einen Teilstapel genau gleicher Blattzahl ab, wobei beide Teilstapel gleichzeitig auf die Tischplatte 1 zu liegen kommen und dann von dieser weitergeschoben werden.An additional advantage of the design and mode of operation of the unstacking device according to the invention is that the unstacking device can easily be removed for parallel processing of two (or even more) stacks of sheets at the same time. The unstacking device shown in the drawings contains only a pair of pliers 6, 7 carried by a circuit board 15 for removing partial stacks from only one stack of sheets 3. However, a second block 16 with a second pair of pliers 6, 7 can be spaced apart on the plier carrier 8 from and parallel to the first pliers 6, 7 and designed the same way as these. Then on the wing 2, e.g. Pallet, two sheets 3 stacked side by side. If the table top 1 then executes the movements described and the pneumatic cylinders 13, 27, 28, 29 and 20 of the two pliers are actuated simultaneously in the manner described, the device then takes a partial stack of exactly the same number of sheets from both sheets. whereby both partial stacks come to lie on the table top 1 at the same time and are then pushed on by it.

Claims (10)

1. Unstacking apparatus for the removal of a partial stack from a sheet stack (3) disposed on a supporting surface (2), with a tabletop (1), a horizontal adjustment device (5) for executing horizontal relative movements between the tabletop (1) and the aforementioned supporting surface (2), a gripper comprising an upper gripper jaw (6) and a gripper base (7) for seizing and holding an edge of a partial stack (3.1), and a vertical adjustment device (4) for executing vertical relative motions between the tabletop (1) and the gripper (6, 7), on the one hand, and the supporting surface (2), on the other hand, characterized in that the gripper base (7) contains a blade guide (11), a horizontal blade (12), and a blade drive mechanism (13) for effecting horizontal motions of the blade (12) with respect to the blade guide (11), as well as, beside the blade (12), at least one supporting element (24, 25), and a supporting element adjustment device (26, 27, 28) for executing horizontal movements of the supporting element (24, 25) with respect to the blade guide (11); and that the gripper (6, 7) furthermore comprises a supporting element rise and fall mechanism (29, 30) for executing vertical movements of the supporting element (24, 25) with respect to the blade (12).
2. Unstacking apparatus according to claim 1, characterized in that it furthermore contains a means (4, 9, 14, 16, 20) for executing vertical relative motions between the blade guide (11), as well as the upper gripper jaw (6), on the one hand, and the tabletop (1), on the other hand.
3. Unstacking apparatus according to claim 1 or 2, characterized by a gripper carrier (8) which guides an element (14) carrying the upper gripper jaw (6) and the blade guide (11) in a freely vertically displaceable fashion.
4. Unstacking apparatus according to claims 2 and 3, characterized in that the downward movability of the element (14) carrying the upper gripper jaw (6) and the blade guide (11) is limited with respect to the gripper carrier (8) by cooperating stop elements (8, 16, 18, 19), of which at least one (19) is vertically adjustable by means of a drive mechanism (20) for adjusting the lower end position of the aforementioned element (14).
5. Unstacking apparatus according to claim 3 or 4, characterized by adjustable weight-exerting or weight-relieving means (34, 35) for varying the force required for lifting the element (14) carrying the upper gripper jaw (6) and the blade guide (11).
6. Unstacking apparatus according to one of claims 3 to 5, characterized in that the tabletop (1) is arranged in a horizontally displaceable fashion at a table guideway (5) retained on a machine column (4).
7. Unstacking apparatus according to claim 6, characterized in that the table guideway (5) is a slide arranged at the machine column (4) to be vertically displaceable.
8. Unstacking apparatus according to claim 7, characterized in that the gripper carrier (8) is arranged at a second slide (9) guided at the machine column (4) to be vertically displaceable, this slide being liftable and lowerable with respect to the first-mentioned slide (5).
9. Unstacking apparatus according to claim 8, characterized in that the gripper carrier (8) is horizontally displaceable by means of a drive mechanism (10) with respect to the second slide (9).
10. Unstacking apparatus according to one of claims 7 to 9, characterized by a control unit for automatically, in succession,
(a) operating the vertical adjustment device (4) for lowering the table guideway (5) and the gripper carrier (8) until the upper gripper jaw (6) rests on the topside of a sheet stack (3),
(b) operating the blade drive mechanism (13) for plunging the blade (12) into the sheet stack (3),
(c) thereafter operating the vertical adjustment device (4) for lifting the table guideway (5) and the gripper carrier (8) by a first predetermined distance in order to lift a place of the edge of a partial stack (3.1) off the remaining residue (3.2) of the sheet stack (3),
(d) subsequently operating the supporting element adjustment device (26, 27, 28) for inserting the supporting element (24, 25) underneath the partial stack edge supported by the blade (12),
(e) thereafter operating the supporting element rise and fall device (29, 30) for raising the supporting element (24, 25) with respect to the blade with a predetermined force,
(f) operating the blade drive mechanism (13) in order to pull the blade (12) away horizontally from underneath the edge of the partial stack (3.1),
(g) thereafter operating the vertical adjustment device (4) for the further raising of the table guideway (5) and of the gripper carrier (8) by a second predetermined distance, (h) then operating the horizontal adjustment device (5) for the horizontal displacement of the tabletop (1) between the partial stack (3.1) and the remaining residue (3.2) of the sheet stack (3),
(i) operating the supporting element rise and fall device (29, 30) for lowering the supporting element (24, 25) with respect to the blade (12),
(k) operating the supporting element adjusting device (26, 27, 28) in order to pull the supporting element (24, 25) horizontally away from underneath the edge of the partial stack (3.1).
EP90810688A 1989-10-12 1990-09-12 Pile unleader for removing a sub-pile from a pile of sheets Expired - Lifetime EP0423065B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3729/89A CH680126A5 (en) 1989-10-12 1989-10-12
CH3729/89 1989-10-12

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EP0423065A2 EP0423065A2 (en) 1991-04-17
EP0423065A3 EP0423065A3 (en) 1992-05-06
EP0423065B1 true EP0423065B1 (en) 1995-02-15
EP0423065B2 EP0423065B2 (en) 1998-12-02

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US (1) US5102293A (en)
EP (1) EP0423065B2 (en)
AT (1) ATE118454T1 (en)
CH (1) CH680126A5 (en)
DE (1) DE59008470D1 (en)

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US4551053A (en) * 1984-05-29 1985-11-05 Fuji Photo Film Co. Ltd. Sheet sub-stack separating and feeding apparatus
IT1201603B (en) * 1986-12-16 1989-02-02 Wrapmatic Spa EQUIPMENT FOR THE AUTOMATIC SELECTION OF LARGE RIMS IN BULK STARTING FROM A PACK OF STACKED SHEETS AND FOR THEIR FEEDING WITH PACKAGING MACHINES AND RELATED METHOD

Also Published As

Publication number Publication date
EP0423065A2 (en) 1991-04-17
CH680126A5 (en) 1992-06-30
ATE118454T1 (en) 1995-03-15
EP0423065B2 (en) 1998-12-02
EP0423065A3 (en) 1992-05-06
US5102293A (en) 1992-04-07
DE59008470D1 (en) 1995-03-23

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