EP0292770B1 - Device for forming a stack out of a prefolded endless web - Google Patents

Device for forming a stack out of a prefolded endless web Download PDF

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Publication number
EP0292770B1
EP0292770B1 EP88107462A EP88107462A EP0292770B1 EP 0292770 B1 EP0292770 B1 EP 0292770B1 EP 88107462 A EP88107462 A EP 88107462A EP 88107462 A EP88107462 A EP 88107462A EP 0292770 B1 EP0292770 B1 EP 0292770B1
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EP
European Patent Office
Prior art keywords
stack
web
stacking
stacking table
conveying
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
EP88107462A
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German (de)
French (fr)
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EP0292770A1 (en
Inventor
Jürgen Peter
Karl-Heinz Schlottke
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ECH Will GmbH and Co
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ECH Will GmbH and Co
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Publication of EP0292770A1 publication Critical patent/EP0292770A1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/02—Folding limp material without application of pressure to define or form crease lines
    • B65H45/06—Folding webs
    • B65H45/10—Folding webs transversely
    • B65H45/101—Folding webs transversely in combination with laying, i.e. forming a zig-zag pile
    • B65H45/1015—Folding webs provided with predefined fold lines; Refolding prefolded webs, e.g. fanfolded continuous forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/02—Folding limp material without application of pressure to define or form crease lines
    • B65H45/06—Folding webs
    • B65H45/10—Folding webs transversely
    • B65H45/109—Registering or counting the folds; Detecting irregularities in the zig-zag 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
    • B65H2301/4226—Delivering, advancing piles
    • B65H2301/42264—Delivering, advancing piles by moving the surface supporting the lowermost article of the pile, e.g. conveyor, carriage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/111—Bottom
    • B65H2405/1113—Bottom with surface portions curved in width-wise direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/11—Dimensional aspect of article or web
    • B65H2701/112—Section geometry
    • B65H2701/1123—Folded article or web
    • B65H2701/11231—Fan-folded material or zig-zag or leporello

Definitions

  • the invention relates to a device for forming a stack from a continuous paper web consisting of contiguous web sections delimited by transverse folding edges and fed in scale-like formation.
  • an “endless web” is understood to mean webs made of different materials, such as paper or film, which circulate, for example, as an endless form web for business papers and the like.
  • Such continuous webs are usually provided with weakening or breaking lines, usually in the form of a perforation, transversely to the direction of travel, so that after passing through a so-called zigzag folding device they bend along these breaking lines.
  • breaking lines usually in the form of a perforation, transversely to the direction of travel, so that after passing through a so-called zigzag folding device they bend along these breaking lines.
  • a device of the type described is known for example from DE-OS 35 24 246.
  • DE-OS 27 12 588 discloses a storage device which a sinking in of the stack prevents a lifting flap which can be moved out centrally from the storage platform depending on the stack height and which only raises and deforms the stack to a greater or lesser extent in the middle, while its folded edges remain stretched on the platform.
  • the invention is based on the object of specifying a stacking device which produces the stack formation in a safe, trouble-free, wrinkle-free and thus paper-friendly manner and also stacks of defined outer contour regardless of their respective height in a consistently good quality.
  • a stack sensor provided with a curvature extending over the entire stack support surface between the fold edges delimiting the web sections and breaking the fold edges.
  • this curvature of the stack sensor can in principle be concave or convex in order to stabilize or stiffen the stack in its longitudinal direction.
  • the stack pickup is designed as a stacking table which is curved upwards and can be moved in height. In this way, the formation of the web sections, which is supplied in the form of scales, can be transferred into the stacking plane in a particularly unproblematic manner.
  • the stacking table is assigned circumferential folding fingers in its area receiving the folding surface or folding lines of the endless web that form in the conveying direction, the length of which is adapted to the curvature of the stacking table. In this way, each incoming web section is pre-arched when it is deposited or stacked and stiffened in its longitudinal direction.
  • a reliable and uniform adaptation of the web sections to the curvature of the stack pickup is ensured in that four folding fingers of different lengths lying one behind the other transversely to the conveying direction are assigned to the stacking table.
  • shorter and longer folding fingers are expediently arranged symmetrically to the curvature time.
  • a configuration which prepares the stack and in this sense cooperates with the stack pickup is that the stacking table is assigned a conveyor belt which detects the prefolded endless web and which, according to an additional proposal, runs between two folding fingers along the zenith line of the curvature of the stacking table.
  • the conveyor belt is provided with suction air openings at a distance from the folds of the endless web, which openings capture the folded web sections upstream behind the folded edges and lead to the stacking tray in a defined manner.
  • a further means of supporting the depositing of individual web sections during stack formation is that a belt web is assigned to the stacking table in its area which receives the folding surface of the continuous web, which folds in the direction of conveyance in the conveying direction .
  • each web section is held in the region of its folded edge and forcibly guided downwards, and on the other hand, air trapped between the web sections is sucked out, so that the web sections can lie close to one another.
  • the curvature of the stacking table is divided into longitudinal curvature sections, the free longitudinal slots of which serve to accommodate stacking supports which can be activated alternately with the stacking table and which are used for Support of the next stack can be inserted into these longitudinal slots or which allow the stacking table with the previously completed stack to be lowered unhindered when the stack supports are retracted.
  • the stack table In order to complete the stack formation, provision is also made for the stack table to be assigned a stack removal means which runs transversely to the stack height and has a separating means which separates the stack along a web fold.
  • the stacking table In order to handle and lay down the severed web section of the associated subsequent stack when it is transferred to the removal conveyor in such a way that faults are avoided, the stacking table is provided with blowing nozzles directed upward and impinging on a severed web section. These blowing nozzles keep the severed section of the web horizontal until it is deposited on the conveyor, ie extended or parallel to its conveying surface.
  • the stack removal means consist of two successive removal conveyor belt tracks, of which the first belt track arranged upstream in relation to the removal direction is a deflection roller which is adjacent to the second belt track and is acted upon by suction air having.
  • This deflecting roller first pulls the web section downward out of the stacking level, so that the stack which has been removed can be conveyed over the folded edge of the deflected web section, the web section on the second belt web to the underside of the stack is folded back, which completes the stack formation.
  • the advantage achieved by the invention is that the stack is stabilized, ie stiffened, in its feed direction or longitudinal direction by the forced curvature of the stack in the planes determined by the transverse folding edges or in the planes running parallel thereto, that is, stiffened in such a way that during the stack construction sinking or a depression in the middle of the stack is prevented and the stacks emitted by the stacking device assume a uniform, rectangular shape or an all-round straight-sided and straight-edged shape regardless of their respective height.
  • the stacking members assigned to the stacking device can perform their specific functions safely and without interference because of the defined, defined stack surface contour, which is kept under control at all times, and can place the web section precisely and wrinkle-free.
  • the stacking device shown in the figures is part of a device for zigzag folding of endless material webs, not shown, for example, described in DE-OS 35 24 246.
  • a continuous web or material web 1 pre-folded along pre-embossed or perforated weakening lines in the known manner described there is fed to a stacking station 2.
  • the pre-folded material web 1 is guided between a lower belt web 3 and an upper conveyor belt 4 in a defined manner.
  • both the conveyor belt 3 and the conveyor belt 4 have suction openings 6 and 7, which are guided in the region of the strands of the conveyor belt 6 and the conveyor belt 4 facing the material web over a suction chamber 8 and 9, respectively.
  • the suction openings 7 in the conveyor belt 4 are arranged at a distance from the folds 11 of the material web 1 and capture the folds 11 in an area behind the fold lines or fold edges 12 to be formed - in relation to the conveying direction of the material web 1, the conveyor belt 4 rotating slightly faster than the folds 11 are fed so that the fold lines 12 coincide exactly with the predetermined weakening lines of the material web 1.
  • the folds 11 of the material web 1 tied up between the belt conveyor 3 and the conveyor belt 4 reach the stacking station 2, in which the folds of the fold leading in the direction of conveyance (arrow 13) are acted upon by rotating folding fingers 14 and downward to form sharp-edged fold lines 12 on a stacking table 16 Stack pickers are pressed.
  • the folding edges or folding lines 12 leading in relation to the conveying direction 13 form the front stacking surface 17 of the zigzag stack 18.
  • a rotating brush 19 supports the laying down of the folds 11.
  • the rear folding edges 22 are grasped one after the other and are forcibly guided downwards until they are placed on the stack, air which may also be trapped between the folds 11 being sucked up, so that the folds 11 can be close to each other.
  • the stacking table according to FIG. 2 is provided with a curvature 26 extending in the conveying direction (arrow 13) of the material web 1.
  • the folding fingers 14 lined up transversely to the conveying direction are adapted to the course of this curvature, in that two shorter folding fingers 14a are provided symmetrically to the curvature time on both sides of the conveyor belt 4 and two longer folding fingers 14b are assigned to the outer edges of the curvature 26.
  • the arch 26 is divided into three longitudinal arch sections 26a, 26b, 26c, between which longitudinal slots 27 extend.
  • the stacking table 16 can be lowered in stages after an accumulation of folds 11, for which purpose the stacking table 16 is equipped with a vertical guide 28 and a lifting drive means 29.
  • a partial sword 32 which can be pivoted about an axis 31 is pivoted inward between two folds by a counting and monitoring means (not shown further) in order to divide the finished stack 18.
  • a sword-shaped stack support 33 which is provided with a horizontal drive means 34 and a stroke drive means 36, is moved into the divided fold 11 according to FIG. 3 and in the course of the increasing accumulation of zigzag Zack folds 11 lowered.
  • the previously completed stack 18 is lowered by the lifting drive means 29 of the stacking table 16 to the level of removal means 37 running transversely to the stack height.
  • the conveyor means 37 consist of a first conveyor belt track 38 and a second conveyor belt track 39, of which the individual belts of the former are passed through the longitudinal slots 27 of the stacking table 16.
  • the stack is removed from the stacking station 2 according to FIG. 3 with the aid of a removal tongs 41, the fold 11 bridging the finished stack 18a and the newly formed stack 18b resting on the stack support 33 is opened.
  • the stack is finally separated by separating the fold 11 from the finished stack 18a by means of a separating means 42.
  • the lower arc section 43a of the stack 18a which had previously arisen after cutting through the fold bridging the two stacks 18 and 18a, is then folded back under the latter when the stack 18a is being removed.
  • the conveyor belt web 38 is provided with a deflection suction roller 44, which deflects the arc section 43a downward when the belt web 38 is deflected.
  • the curved section 43a then becomes automatic folded around and placed against the bottom of the stack.
  • the stacking table 16 is freed from stack 18a, it is moved upwards again by the lifting drive means 29, the longitudinal slots 27 forming a free space for receiving the stacking supports 33 between the longitudinal curvature sections 26a to 26c.
  • the longitudinal curvature of the stack which previously occurred due to the lateral hanging down over the two stack supports 33 is again taken over by the shape-related curvature 26 of the stacking table 16.
  • the sheet section 43b formed by the separation of the fold 11 previously bridging the two stacks 18a and 18b is held horizontally, according to FIG can.

Description

Die Erfindung betrifft eine Vorrichtung zum Bilden eines Stapels aus einer aus aneinanderhängenden, durch querverlaufende Falzkanten begrenzten und in schuppenartiger Formation zugeförderten Bahnabschnitten bestehenden Endlospapierbahn.The invention relates to a device for forming a stack from a continuous paper web consisting of contiguous web sections delimited by transverse folding edges and fed in scale-like formation.

Unter einer 'Endlosbahn' sind im Sinne der Erfindung Bahnen aus unterschiedlichen Materialien, wie zum Beispiel Papier oder Folie zu verstehen, die beispielsweise als endlose Formularbahn für Geschäftspapiere und dergleichen in Umlauf gelangen. Derartige Endlosbahnen werden üblicherweise quer zur Laufrichtung mit Schwächungs- oder Bruchlinien, meistenteils in Form einer Perforation, versehen, so daß sie nach Durchlauf einer sogenannten Zick-Zack-Falteinrichtung entlang dieser Bruchlinien abknicken. Auf diese Weise werden einzelne Bahnabschnitte der Endlosbahn gegenüber den jeweils nachfolgenden Bahnabschnitten so geklappt, daß die jeweiligen Bahnabschnitte bei der Stapelbildung zick-zack-förmig aufeinander zu liegen kommen.
Eine Vorrichtung der beschriebenen Art ist zum Beispiel durch die DE-OS 35 24 246 bekannt.In the context of the invention, an “endless web” is understood to mean webs made of different materials, such as paper or film, which circulate, for example, as an endless form web for business papers and the like. Such continuous webs are usually provided with weakening or breaking lines, usually in the form of a perforation, transversely to the direction of travel, so that after passing through a so-called zigzag folding device they bend along these breaking lines. In this way, individual web sections of the endless web are folded relative to the subsequent web sections in such a way that the respective web sections come to lie on one another in a zigzag shape when the stacks are formed.
A device of the type described is known for example from DE-OS 35 24 246.

Je höher derartige Stapel aufgebaut werden, desto schwerer wird es, eine einwandfreie Arbeitsweise der Stapelvorrichtung sowie eine definierte geometrische Stapelform zu gewährleisten, die für eine komplikationslose Weiterverarbeitung der Zick-Zack-Stapel unerläßlich sind.
Eine sich mit zunehmender Stapelhöhe auswachsende Störquelle besteht darin, daß der Aufbau des Stapels an den Rändern im Bereich der Faltlinien wesentlich höher wird als in der Stapelmitte, in der sich eine Vertiefung bildet, die eine störungsfreie Ablage behindert.
Die DE-OS 27 12 588 offenbart eine Ablagevorrichtung, welche ein Einsinken des Stapels dadurch verhindert, daß eine zentral aus der Ablageplattform in Abhängigkeit von der Stapelhöhe herausfahrbare Hebeklappe vorgesehen ist, welche den Stapel ausschließlich in der Mitte mehr oder weniger stark anhebt und verformt, während dessen Falzkanten gestreckt auf der Plattform liegen bleiben.The higher such stacks are built, the more difficult it becomes to ensure that the stacking device functions properly and that the stack is geometrically defined, which are essential for further processing of the zigzag stacks without complications.
A source of disturbance that increases with increasing stack height is that the structure of the stack at the edges in the area of the fold lines becomes significantly higher than in the middle of the stack, in which a depression is formed, which hinders trouble-free storage.
DE-OS 27 12 588 discloses a storage device which a sinking in of the stack prevents a lifting flap which can be moved out centrally from the storage platform depending on the stack height and which only raises and deforms the stack to a greater or lesser extent in the middle, while its folded edges remain stretched on the platform.

Der Erfindung liegt die Aufgabe zugrunde, eine die Stapelbildung sicher, störungsfrei, knitterfrei und damit papierschonend ausführende sowie Stapel definierter Außenkontur unabhängig von ihrer jeweiligen Höhe in gleichbleibend guter Qualität erzeugende Stapelvorrichtung anzugeben.The invention is based on the object of specifying a stacking device which produces the stack formation in a safe, trouble-free, wrinkle-free and thus paper-friendly manner and also stacks of defined outer contour regardless of their respective height in a consistently good quality.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen mit einer sich über die ganze Stapelstützfläche zwischen den die Bahnabschnitte begrenzenden Falzkanten erstreckenden, die Falzkanten brechenden Wölbung versehenen Stapelaufnehmer. Im Sinne der Erfindung kann diese Wölbung des Stapelaufnehmers grundsätzlich konkav oder konvex ausgeformt sein, um den Stapel in seiner Längsrichtung zu stabilisieren bzw. zu versteifen. Eine die Arbeitsweise der übrigen Stapelorgane besonders erleichternde Ausgestaltung der Erfindung besteht darin, daß der Stapelaufnehmer als nach oben gewölbter, in der Höhe verfahrbarer Stapeltisch ausgebildet ist. Auf diese Weise läßt sich die schuppenförmig zugeführte Formation der Bahnabschnitte besonders unproblematisch in die Stapelebene überführen.
Gemäß einer Weiterbildung sind dem Stapeltisch in seinem die aus in Förderrichtung jeweils voreilenden Faltkanten bzw. Faltlinien der Endlosbahn gebildete Stapelfläche aufnehmenden Bereich umlaufende Faltfinger zugeordnet, deren Länge dem Wölbungsverlauf des Stapeltisches angepaßt ist. Auf diese Weise wird jeder ankommende Bahnabschnitt bei seiner Ablage bzw. bei der Stapelbildung vorgewölbt und in seiner Längsrichtung versteift.This object is achieved according to the invention by a stack sensor provided with a curvature extending over the entire stack support surface between the fold edges delimiting the web sections and breaking the fold edges. In the sense of the invention, this curvature of the stack sensor can in principle be concave or convex in order to stabilize or stiffen the stack in its longitudinal direction. One embodiment of the invention which particularly facilitates the operation of the other stacking members is that the stack pickup is designed as a stacking table which is curved upwards and can be moved in height. In this way, the formation of the web sections, which is supplied in the form of scales, can be transferred into the stacking plane in a particularly unproblematic manner.
According to a further development, the stacking table is assigned circumferential folding fingers in its area receiving the folding surface or folding lines of the endless web that form in the conveying direction, the length of which is adapted to the curvature of the stacking table. In this way, each incoming web section is pre-arched when it is deposited or stacked and stiffened in its longitudinal direction.

Eine zuverlässige und gleichmäßige Anpassung der Bahnabschnitte an die Wölbung des Stapelaufnehmers ist nach einem weiteren Vorschlag dadurch gewährleistet, daß dem Stapeltisch vier quer zur Förderrichtung hintereinanderliegende Faltfinger unterschiedlicher Länge zugeordnet sind. Zweckmäßigerweise sind darüber hinaus jeweils kürzere und längere Faltfinger symmetrisch zum Wölbungszenit angeordnet.
Zur Vereinfachung des Antriebes der Faltfinger wird weiterhin vorgeschlagen, daß für mehrere Stapeltische einer mehrnutzigen Stapelvorrichtung alle zugeordneten Faltfinger auf einer gemeinsamen Antriebswelle angeordnet sind.
Eine die Stapelbildung vorbereitende und in diesem Sinne mit dem Stapelaufnehmer zusammenarbeitende Ausgestaltung besteht darin, daß dem Stapeltisch oberseitig ein die vorgefaltete Endlosbahn erfassendes Transportband zugeordnet ist, welches nach einem zusätzlichen Vorschlag zwischen zwei Faltfingern entlang der Zenitlinie der Wölbung des Stapeltisches verläuft.According to a further proposal, a reliable and uniform adaptation of the web sections to the curvature of the stack pickup is ensured in that four folding fingers of different lengths lying one behind the other transversely to the conveying direction are assigned to the stacking table. In addition, shorter and longer folding fingers are expediently arranged symmetrically to the curvature time.
To simplify the drive of the folding fingers, it is also proposed that for several stacking tables of a multi-use stacking device all assigned folding fingers are arranged on a common drive shaft.
A configuration which prepares the stack and in this sense cooperates with the stack pickup is that the stacking table is assigned a conveyor belt which detects the prefolded endless web and which, according to an additional proposal, runs between two folding fingers along the zenith line of the curvature of the stacking table.

Gemäß einer weiteren Ausgestaltung ist das Transportband im Abstand der Falten der Endlosbahn mit Saugluftöffnungen versehen, welche die gefalteten Bahnabschnitte stromauf hinter den Faltkanten erfassen und definiert zur Stapelablage führen.According to a further embodiment, the conveyor belt is provided with suction air openings at a distance from the folds of the endless web, which openings capture the folded web sections upstream behind the folded edges and lead to the stacking tray in a defined manner.

Ein weiteres Mittel zur Unterstützung der Ablage einzelner Bahnabschnitte bei der Stapelbildung besteht darin, daß dem Stapeltisch in seinem die aus in Förderrichtung jeweils nacheilenden Faltkanten der Endlosbahn gebildete Stapelfläche aufnehmenden Bereich eine Bänderbahn zugeordnet ist, deren die Stapelfläche begrenzender, vertikal verlaufender Förderabschnitt mit Saugluft beaufschlagt ist. Hierdurch wird einerseits jeder Bahnabschnitt im Bereich seiner Faltkante gehalten und zwangsweise abwärts geleitet und andererseits zwischen den Bahnabschnitten eingeschlossene Luft abgesaugt, so daß sich die Bahnabschnitte dicht an dicht aufeinanderlegen können.A further means of supporting the depositing of individual web sections during stack formation is that a belt web is assigned to the stacking table in its area which receives the folding surface of the continuous web, which folds in the direction of conveyance in the conveying direction . In this way, on the one hand, each web section is held in the region of its folded edge and forcibly guided downwards, and on the other hand, air trapped between the web sections is sucked out, so that the web sections can lie close to one another.

Um bei jeweils fertiggestelltem Stapel mit definierter Blattanzahl während der Abförderung dieses Stapels den Aufbau des nächstfolgenden Stapels ohne Unterbrechung vornehmen zu können, ist die Wölbung des Stapeltisches in Längswölbungsabschnitte unterteilt, deren freie Längsschlitze zur Aufnahme von im Wechsel mit dem Stapeltisch aktivierbaren Stapelstützen dienen, welche zur Stützung des nächstfolgenden Stapels in diese Längsschlitze eingefahren werden können bzw. die es erlauben, bei eingefahrenen Stapelstützen den Stapeltisch mit dem vorher fertiggestellten Stapel unbehindert nach unten abzusenken.In order to be able to carry out the construction of the next stack without interruption when a stack with a defined number of sheets is finished, the curvature of the stacking table is divided into longitudinal curvature sections, the free longitudinal slots of which serve to accommodate stacking supports which can be activated alternately with the stacking table and which are used for Support of the next stack can be inserted into these longitudinal slots or which allow the stacking table with the previously completed stack to be lowered unhindered when the stack supports are retracted.

Um die Stapelbildung abzuschließen, ist außerdem vorgesehen, daß dem Stapeltisch ein quer zur Stapelhöhe verlaufendes Stapelabfördermittel mit einem den Stapel entlang einer Bahnfalte separierenden Trennmittel zugeordnet ist.
Um den durchtrennten Bahnabschnitt des zugehörigen Folgestapels bei dessen Überführung auf den Abförderer so zu handhaben und abzulegen, daß Störungen vermieden werden, ist der Stapeltisch mit nach oben gerichteten, einen durchtrennten Bahnabschnitt beaufschlagenden Blasdüsen versehen. Diese Blasdüsen halten den durchtrennten Bahnabschnitt bis zur Ablage an den Abförderer horizontal, d. h. ausgestreckt bzw. parallel zu dessen Förderoberfläche.
Um diesen herausgeklappten Bahnabschnitt auf einfache Weise in die Stapelebene des zugehörigen Stapels zurückzufalten, ist darüber hinaus vorgesehen, daß das Stapelabfördermittel aus zwei aufeinanderfolgenden Abförderbänderbahnen besteht, von denen die bezogen auf die Abförderrichtung stromauf angeordnete erste Bänderbahn eine der zweiten Bänderbahn benachbarte, mit Saugluft beaufschlagte Umlenkrolle aufweist. Diese Umlenkrolle zieht zunächst den Bahnabschnitt nach unten aus der Stapelebene heraus, so daß der abgeförderte Stapel über die Faltkante des abgelenkten Bahnabschnittes hinweggefördert werden kann, wobei der Bahnabschnitt auf der zweiten Bänderbahn an die Stapelunterseite zurückgeklappt wird, womit die Stapelbildung vollendet ist.In order to complete the stack formation, provision is also made for the stack table to be assigned a stack removal means which runs transversely to the stack height and has a separating means which separates the stack along a web fold.
In order to handle and lay down the severed web section of the associated subsequent stack when it is transferred to the removal conveyor in such a way that faults are avoided, the stacking table is provided with blowing nozzles directed upward and impinging on a severed web section. These blowing nozzles keep the severed section of the web horizontal until it is deposited on the conveyor, ie extended or parallel to its conveying surface.
In order to fold this folded-out web section back into the stacking level of the associated stack in a simple manner, it is also provided that the stack removal means consist of two successive removal conveyor belt tracks, of which the first belt track arranged upstream in relation to the removal direction is a deflection roller which is adjacent to the second belt track and is acted upon by suction air having. This deflecting roller first pulls the web section downward out of the stacking level, so that the stack which has been removed can be conveyed over the folded edge of the deflected web section, the web section on the second belt web to the underside of the stack is folded back, which completes the stack formation.

Der mit der Erfindung erzielte Vorteil besteht darin, daß durch die Zwangswölbung des Stapel in den durch die querverlaufenden Faltkanten bestimmten bzw. in den dazu parallel verlaufenden Ebenen, der Stapel in seiner Zuförderrichtung bzw. Längsrichtung derart stabilisiert, d. h. versteift wird, daß während des Stapelaufbaues ein Einsinken bzw. eine Vertiefung in der Stapelmitte verhindert wird und die von der Stapelvorrichtung abgegebenen Stapel unabhängig von ihrer jeweiligen Höhe eine gleichmäßige, rechteckige bzw. eine rundherum geradseitige und geradkantige Form annehmen. Die der Stapelvorrichtung zugeordneten Stapelorgane können wegen der jederzeit unter Kontrolle gehaltenen, definierten Stapeloberflächenkontur sicher und störungsfrei ihre spezifischen Funktionen ausüben und Bahnabschnitt für Bahnabschnitt exakt und knitterfrei auflegen.The advantage achieved by the invention is that the stack is stabilized, ie stiffened, in its feed direction or longitudinal direction by the forced curvature of the stack in the planes determined by the transverse folding edges or in the planes running parallel thereto, that is, stiffened in such a way that during the stack construction sinking or a depression in the middle of the stack is prevented and the stacks emitted by the stacking device assume a uniform, rectangular shape or an all-round straight-sided and straight-edged shape regardless of their respective height. The stacking members assigned to the stacking device can perform their specific functions safely and without interference because of the defined, defined stack surface contour, which is kept under control at all times, and can place the web section precisely and wrinkle-free.

Die Erfindung wird nachstehend anhand des in den beigefügten Abbildungen dargestellten Ausführungsbeispieles näher erläutert.The invention is explained below with reference to the embodiment shown in the accompanying figures.

Hierbei zeigen:

Figur 1
eine schematische Gesamtansicht der Stapelvorrichtung,
Figur 2
eine Ansicht auf die Stapelvorrichtung nach der Linie II-II gemäß Figur 1 und
Figur 3
eine gegenüber Figur 1 veränderte Arbeitsstellung der Stapelvorrichtung in der Gesamtansicht.
Here show:
Figure 1
a schematic overall view of the stacking device,
Figure 2
a view of the stacking device along the line II-II of Figure 1 and
Figure 3
a working position of the stacking device changed compared to Figure 1 in the overall view.

Die in den Abbildungen dargestellte Stapelvorrichtung ist Teil einer nicht weiter dargestellten, beispielsweise in der DE-OS 35 24 246 beschriebenen Einrichtung zum Zick-Zack-Falten endloser Materialbahnen.
Eine auf die dort beschriebene bekannte Weise entlang von vorgeprägten bzw. perforierten Schwächungslinien vorgefaltete Endlosbahn bzw. Materialbahn 1 wird einer Stapelstation 2 zugeführt. Die vorgefaltete Materialbahn 1 wird hierbei zwischen einer unteren Bänderbahn 3 und einem oberen Transportband 4 definiert geführt. Zu diesem Zweck weisen sowohl die Bänderbahn 3 als auch das Transportband 4 Saugöffnungen 6 bzw. 7 auf, die im Bereich der der Materialbahn 1 zugewandten Trume der Bänderbahn 6 bzw. des Transportbandes 4 über eine Saugkammer 8 bzw. 9 hinweggeführt sind. Die Saugöffnungen 7 im Transportband 4 sind im Abstand der Falten 11 der Materialbahn 1 angeordnet und erfassen die Falten 11 in einem Bereich hinter den zu bildenden Faltlinien bzw. Faltkanten 12 - bezogen auf die Förderrichtung der Materialbahn 1, wobei das Transportband 4 geringfügig schneller umläuft als die Falten 11 zugeführt werden, so daß die Faltlinien 12 exakt mit den vorgegebenen Schwächungslinien der Materialbahn 1 zusammenfallen.The stacking device shown in the figures is part of a device for zigzag folding of endless material webs, not shown, for example, described in DE-OS 35 24 246.
A continuous web or material web 1 pre-folded along pre-embossed or perforated weakening lines in the known manner described there is fed to a stacking station 2. The pre-folded material web 1 is guided between a lower belt web 3 and an upper conveyor belt 4 in a defined manner. For this purpose, both the conveyor belt 3 and the conveyor belt 4 have suction openings 6 and 7, which are guided in the region of the strands of the conveyor belt 6 and the conveyor belt 4 facing the material web over a suction chamber 8 and 9, respectively. The suction openings 7 in the conveyor belt 4 are arranged at a distance from the folds 11 of the material web 1 and capture the folds 11 in an area behind the fold lines or fold edges 12 to be formed - in relation to the conveying direction of the material web 1, the conveyor belt 4 rotating slightly faster than the folds 11 are fed so that the fold lines 12 coincide exactly with the predetermined weakening lines of the material web 1.

Die zwischen der Bänderbahn 3 und dem Transportband 4 gefesselt herangeführten Falten 11 der Materialbahn 1 erreichen die Stapelstation 2, in der die in Förderrichtung (Pfeil 13) voreilenden Faltenwölbungen durch rotierende Faltfinger 14 beaufschlagt und zwecks Bildung scharfkantiger Faltlinien 12 abwärts auf einen als Stapeltisch 16 ausgebildeten Stapelaufnehmer gedrückt werden. Die bezogen auf die Förderrichtung 13 voreilenden Faltkanten bzw. Faltlinien 12 bilden die vordere Stapelfläche 17 des Zick-Zack-Stapels 18. Eine rotierende Bürste 19 unterstützt das Ablegen der Falten 11. In der Seitenansicht gemäß Figur 2 ist zu erkennen, daß in Form einer mehrnutzigen Einrichtung mehrere der genannten Elemente, wie Transportbänder 4 und Stapeltische 16 mit zugeordneten Faltfingern 14 für mehrere zugeförderte Materialbahnen 1 nebeneinander angeordnet sind, im vorliegenden Ausführungsbeispiel in fünffacher Anordnung. Alle rotierend antreibbaren Faltfinger 14 sind auf einer gemeinsamen Antriebswelle 21 befestigt. Um die bezogen auf die Förderrichtung hinteren Faltkanten 22 ebenfalls sicher auf dem Stapel 18 ablegen zu können, ist die Bänderbahn 3 mit einem vertikal verlaufenden Förderabschnitt 23 ausgestattet, der an seiner Innenseite durch eine Saugkammer 24 begrenzt ist. Durch die über die Saugkammer 24 hinweggeführten Saugöffnungen 6 der Bänderbahn 3 werden die rückwärtigen Faltkanten 22 nacheinander erfaßt und zwangsweise bis zur Ablage auf den Stapel nach unten geführt, wobei außerdem evtl. zwischen den Falten 11 eingeschlossene Luft abgesauft wird, so daß sich die Falten 11 eng aneinanderlegen können.
Um zu vermeiden, daß der Stapel 18 infolge der sich stärker aufbauenden Faltkanten 12 und 22 in der Mitte einsinkt bzw. sich konkav ausformt, ist der Stapeltisch gemäß Figur 2 mit einer sich in Förderrichtung (Pfeil 13) der Materialbahn 1 erstreckenden Wölbung 26 versehen. Dem Verlauf dieser Wölbung sind die quer zur Förderrichtung hintereinandergereihten Faltfinger 14 angepaßt, indem jeweils zwei kürzere Faltfinger 14a symmetrisch zum Wölbungszenit zu beiden Seiten des Transportbandes 4 vorgesehen und zwei längere Faltfinger 14b den äußeren Rändern der Wölbung 26 zugeordnet sind. Die Wölbung 26 ist in drei Längswölbungsabschnitte 26a, 26b, 26c unterteilt, zwischen denen Längsschlitze 27 verlaufen.
Der Stapeltisch 16 ist jeweils nach einer Ansammlung von Falten 11 stufenweise absenkbar, wozu der Stapeltisch 16 mit einer Vertikalführung 28 und einem Hubantriebsmittel 29 ausgestattet ist. Sobald eine vorbestimmte Gesamtzahl von Falten 11 auf dem Stapel 18 abgelegt ist, wird durch ein nicht weiter dargestelltes Zähl- und Überwachungsmittel ein um eine Achse 31 schwenkbares Teilschwert 32 zwischen zwei Falten einwärtsgeschwenkt, um den fertigen Stapel 18 abzuteilen. Um einen neuen Stapel aus der ununterbrochen zugeführten Materialbahn 1 bilden zu können, wird eine schwertförmige Stapelstütze 33, die mit einem Horizontalantriebsmittel 34 und einem Hubantriebsmittel 36 versehen ist, gemäß Figur 3 in die abgeteilte Falte 11 eingefahren und im Verlauf der zunehmenden Ansammlung von Zick-Zack-Falten 11 abgesenkt. Der zuvor fertiggestellte Stapel 18 wird durch das Hubantriebsmittel 29 des Stapeltisches 16 bis auf das Niveau von quer zur Stapelhöhe verlaufenden Abfördermitteln 37 abgesenkt. Die Abfördermittel 37 bestehen aus einer ersten Abförderbänderbahn 38 und einer zweiten Abförderbänderbahn 39, von denen die Einzelbänder der ersteren durch die Längsschlitze 27 des Stapeltisches 16 hindurchgeführt sind. Sowie der fertige Stapel 18a auf der Abförderbänderbahn 38 abgesetzt ist, wird der Stapel unter Zuhilfenahme einer Abförderzange 41 aus der Stapelstation 2 gemäß Figur 3 entfernt, wobei die den fertigen Stapel 18a und den auf dem Stapelstützen 33 ruhenden, neu gebildeten Stapel 18b überbrückende Falte 11 geöffnet wird. Durch Trennen der Falte 11 vom fertigen Stapel 18a mittels eines Trennmittels 42 wird der Stapel endgültig separiert. Der untere Bogenabschnitt 43a des Stapels 18a, der zuvor nach dem Durchtrennen der die beiden Stapel 18 und 18a überbrückenden Falte entstanden war, wird anschließend beim Abfördern des Stapels 18a unter diesen zurückgefaltet. Hierzu ist die Abförderbänderbahn 38 mit einer Umlenk-Saugwalze 44 versehen, welche den Bogenabschnitt 43a bei der Umlenkung der Bänderbahn 38 nach unten ablenkt. Bei der Übernahme des Stapels 18a durch die folgende Abförderbänderbahn 39 wird der Bogenabschnitt 43a dann automatisch herumgeklappt und gegen die Stapelunterseite gelegt. Sowie der Stapeltisch 16 von Stapel 18a befreit ist, wird er durch das Hubantriebsmittel 29 erneut nach oben bewegt, wobei die Längsschlitze 27 zwischen den Längswölbungsabschnitten 26a bis 26c einen Freiraum zur Aufnahme der Stapelstützen 33 bilden. Die sich zuvor durch das seitliche Herunterhängen über die beiden Stapelstützen 33 einstellende Längswölbung des Stapels wird erneut durch die formgebundene Wölbung 26 des Stapeltisches 16 übernommen.The folds 11 of the material web 1 tied up between the belt conveyor 3 and the conveyor belt 4 reach the stacking station 2, in which the folds of the fold leading in the direction of conveyance (arrow 13) are acted upon by rotating folding fingers 14 and downward to form sharp-edged fold lines 12 on a stacking table 16 Stack pickers are pressed. The folding edges or folding lines 12 leading in relation to the conveying direction 13 form the front stacking surface 17 of the zigzag stack 18. A rotating brush 19 supports the laying down of the folds 11. In the side view according to FIG. 2 it can be seen that in the form of a multi-use device, several of the above-mentioned elements, such as conveyor belts 4 and stacking tables 16 with associated folding fingers 14 for several supplied material webs 1, are arranged next to one another, in the present exemplary embodiment in a five-fold arrangement. All folding fingers 14 which can be driven in rotation are fastened on a common drive shaft 21. In order to be able to place the folding edges 22 at the rear in relation to the conveying direction also securely on the stack 18, the belt conveyor 3 is equipped with a vertically running conveying section 23 which is delimited on its inside by a suction chamber 24. Through the suction openings 6 of the belt web 3, which are led away over the suction chamber 24, the rear folding edges 22 are grasped one after the other and are forcibly guided downwards until they are placed on the stack, air which may also be trapped between the folds 11 being sucked up, so that the folds 11 can be close to each other.
In order to prevent the stack 18 from sinking in the middle or forming a concave shape as a result of the folding edges 12 and 22, the stacking table according to FIG. 2 is provided with a curvature 26 extending in the conveying direction (arrow 13) of the material web 1. The folding fingers 14 lined up transversely to the conveying direction are adapted to the course of this curvature, in that two shorter folding fingers 14a are provided symmetrically to the curvature time on both sides of the conveyor belt 4 and two longer folding fingers 14b are assigned to the outer edges of the curvature 26. The arch 26 is divided into three longitudinal arch sections 26a, 26b, 26c, between which longitudinal slots 27 extend.
The stacking table 16 can be lowered in stages after an accumulation of folds 11, for which purpose the stacking table 16 is equipped with a vertical guide 28 and a lifting drive means 29. Once a predetermined total number of If folds 11 are placed on the stack 18, a partial sword 32 which can be pivoted about an axis 31 is pivoted inward between two folds by a counting and monitoring means (not shown further) in order to divide the finished stack 18. In order to be able to form a new stack from the continuously fed material web 1, a sword-shaped stack support 33, which is provided with a horizontal drive means 34 and a stroke drive means 36, is moved into the divided fold 11 according to FIG. 3 and in the course of the increasing accumulation of zigzag Zack folds 11 lowered. The previously completed stack 18 is lowered by the lifting drive means 29 of the stacking table 16 to the level of removal means 37 running transversely to the stack height. The conveyor means 37 consist of a first conveyor belt track 38 and a second conveyor belt track 39, of which the individual belts of the former are passed through the longitudinal slots 27 of the stacking table 16. As soon as the finished stack 18a is set down on the conveyor belt path 38, the stack is removed from the stacking station 2 according to FIG. 3 with the aid of a removal tongs 41, the fold 11 bridging the finished stack 18a and the newly formed stack 18b resting on the stack support 33 is opened. The stack is finally separated by separating the fold 11 from the finished stack 18a by means of a separating means 42. The lower arc section 43a of the stack 18a, which had previously arisen after cutting through the fold bridging the two stacks 18 and 18a, is then folded back under the latter when the stack 18a is being removed. For this purpose, the conveyor belt web 38 is provided with a deflection suction roller 44, which deflects the arc section 43a downward when the belt web 38 is deflected. When the stack 18a is taken over by the following conveyor belt path 39, the curved section 43a then becomes automatic folded around and placed against the bottom of the stack. As soon as the stacking table 16 is freed from stack 18a, it is moved upwards again by the lifting drive means 29, the longitudinal slots 27 forming a free space for receiving the stacking supports 33 between the longitudinal curvature sections 26a to 26c. The longitudinal curvature of the stack which previously occurred due to the lateral hanging down over the two stack supports 33 is again taken over by the shape-related curvature 26 of the stacking table 16.

Der durch die Trennung der zuvor die beiden Stapel 18a und 18b überbrückenden Falte 11 entstandene Bogenabschnitt 43b wird gemäß Figur 1 durch aufwärtsgerichtete Blasdüsen 46 am Stapeltisch 16 während dessen Abwärtsbewegung horizontal gehalten, damit er sich ebenfalls bei der Fertigstellung des Stapels ausgestreckt auf der Abförderbänderbahn 38 ablegen kann.The sheet section 43b formed by the separation of the fold 11 previously bridging the two stacks 18a and 18b is held horizontally, according to FIG can.

Claims (14)

  1. Apparatus for forming a stack (18) from a continuous paper web (1) comprising mutually attached web sections, delimited by transversely running fold edges (12, 22) and conveyed in an overlapping formation, characterized by a stack receiver (16) provided with a curved element (26) which extends over the entire stack support surface between the fold edges (12, 22) delimiting the web sections and chamfers the fold edges.
  2. Apparatus according to Claim 1, characterized in that the stack receiver (16) is constructed as an upwardly curved, vertically traversable stacking table.
  3. Apparatus according to Claim 1 and/or 2, characterized in that there are associated with the stacking table (16), in its region receiving the stack surface (17) formed from the, as seen in the conveying direction (13), respectively leading fold edges or fold lines (12) of the continuous web (1), rotating folding fingers (14) whereof the length is matched to the profile of the curved element of the stacking table.
  4. Apparatus according to one of Claims 1 to 3, characterized in that there are associated with the stacking table (16) four folding fingers (14) of different lengths located behind one another transversely with respect to the conveying direction (13).
  5. Apparatus according to Claim 4, characterized in that respectively shorter and longer folding fingers (14a, 14b) are arranged symmetrically with respect to the vertex of the curved element.
  6. Apparatus according to one of Claims 1 to 5, characterized in that, for a plurality of stacking tables (16) of a multipurpose stacking apparatus, all the associated folding fingers (14) are arranged on a common drive shaft (21).
  7. Apparatus according to one of Claims 1 to 6, characterized in that there is associated with the stacking table (16), to the upper side, a conveyor belt (4) holding the pre-folded continuous web (1).
  8. Apparatus according to Claim 7, characterized in that the conveyor belt (4) runs between two folding fingers (14a) along the vertex line of the curved element (26) of the stacking table (16).
  9. Apparatus according to one of Claims 1 to 8, characterized in that the conveyor belt (4) is provided with suction air openings (7) at a spacing from the folds (11) of the continuous web (1).
  10. Apparatus according to one of Claims 1 to 9, characterized in that there is associated with the stacking table (16), in its region receiving the stacking surface formed from the, as seen in the conveying direction (13), respectively leading fold edges (22) of the continuous web (1), a belt band (3) whereof the vertically running conveying section (23) delimiting the stacking surface is acted upon with suction air.
  11. Apparatus according to one of Claims 1 to 10, characterized in that the curved element (26) of the stacking table (16) is subdivided into longitudinal curved sections (26a to 26c) whereof the free longitudinal slots (27) serve to receive stack supports (33) which may be activated in alternation with the stacking table.
  12. Apparatus according to one of Claims 1 to 11, characterized in that there is associated with the stacking table (16) a means (37) for conveying away a stack, which runs transversely with respect to the height of the stack and which has a cutting means (42) separating the stack (18) along a web fold (11).
  13. Apparatus according to one of Claims 1 to 12, characterized in that the stacking table (16) is provided with upwardly directed blower nozzles (46) acting upon a cut-through web section.
  14. Apparatus according to one of Claims 1 to 13, characterized in that the means (37) for conveying away a stack comprises two successive belt bands (38, 39) for conveying away, of which the first belt band (38) arranged upstream with respect to the conveying-away direction has a deflection roller (44) which adjoins the second belt band (39) and which is acted upon with suction air.
EP88107462A 1987-05-29 1988-05-10 Device for forming a stack out of a prefolded endless web Expired - Lifetime EP0292770B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873718081 DE3718081A1 (en) 1987-05-29 1987-05-29 DEVICE FOR FORMING A STACK FROM A FOLDED CONTINUOUS ROAD
DE3718081 1987-05-29

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EP0292770A1 EP0292770A1 (en) 1988-11-30
EP0292770B1 true EP0292770B1 (en) 1992-09-23

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EP (1) EP0292770B1 (en)
JP (1) JPS63306160A (en)
CA (1) CA1309733C (en)
DE (2) DE3718081A1 (en)

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JPS63306160A (en) 1988-12-14
EP0292770A1 (en) 1988-11-30
DE3874808D1 (en) 1992-10-29
US4842573A (en) 1989-06-27
CA1309733C (en) 1992-11-03
DE3718081A1 (en) 1988-12-08

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