EP0426188B1 - Method and device for making hinges in flat cardboard material - Google Patents
Method and device for making hinges in flat cardboard material Download PDFInfo
- Publication number
- EP0426188B1 EP0426188B1 EP90120988A EP90120988A EP0426188B1 EP 0426188 B1 EP0426188 B1 EP 0426188B1 EP 90120988 A EP90120988 A EP 90120988A EP 90120988 A EP90120988 A EP 90120988A EP 0426188 B1 EP0426188 B1 EP 0426188B1
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- European Patent Office
- Prior art keywords
- flat material
- upsetting
- bending
- clamping
- another
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- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/25—Surface scoring
- B31B50/252—Surface scoring using presses or dies
Definitions
- the invention relates to a method and a device for producing hinged hinges on the one side and bulges on the other side in flat material made of cardboard, optionally covered with plastic film, paper, textile tape and / or leather.
- Articulated hinges of this type are required above all on file covers, book covers, cardboard boxes with hinged cover closures and the like.
- the cardboard used for the production of the flat material consists of several paper layers which are connected to one another in a combined fiber and adhesive bond and which can be finished on their surface with a plastic, paper, textile and / or leather lamination.
- the flat material is compressed on the groove side by a compression edge which is immersed in the flat material and at the same time is folded to form the groove and on the bead side on two sides at the same distance on both sides of the compression edge by one bending edge parallel to the compression edge in the opposite direction to the fold is deformed to form outer bead edges, the mutual distance between the bending edges being reduced during the immersion of the upsetting edge.
- that which protrudes laterally beyond the upsetting edge becomes Flat material is pressed by the bending edges, which can be displaced relative to the upsetting edge, against abutment surfaces arranged laterally next to the upsetting edge.
- the abutment surfaces are aligned obliquely to one another, including an obtuse angle, and serve as inclined planes on which the bending edges are displaced in the course of the displacement movement while reducing their mutual distance from the compression edge.
- the flat material gripped by the sharp bending edges is displaced relative to the abutment surfaces while overcoming a frictional force.
- surface expansion, surface damage and tension within the flat material can occur.
- the internal tensions in turn have an influence on the restoring force in the area of the hinge, which can lead to an undesired automatic opening in the hinge area, for example to the automatic opening of folder covers.
- the invention has for its object a method and to develop a device for producing articulated hinges in the cardboard box of the type specified at the outset, with which a smooth-running hinge with only low restoring forces is generated, surface damage in the hinge area can be avoided and a disruptive folding up of the protruding flat material parts during the upsetting process can be prevented.
- the solution according to the invention is based on the idea that a sliding movement between the flat material and the pressing tools must be avoided during the upsetting process in order to ensure tension-free loosening of the fiber composite and trouble-free surface handling in the hinge area.
- this is achieved in that the flat material parts protruding over the bead outer edges are clamped independently of one another at clamping points arranged in the vicinity of the adjacent bending edges and are moved towards one another in flush alignment when the compression edge is immersed in the flat material, the clamping points at the beginning of the immersion process coincide with the bending edge and are moved outward in the course of the reduction in the distance between the bending edges without sliding friction on the flat material parts protruding beyond the outer edge of the bead.
- This procedure has the additional advantage that the protruding flat material parts do not have to be pivoted against one another in the course of the upsetting process.
- the distance between the clamping points can be approximately during the reduction in the distance of the bending edges stay the same.
- the latter is made possible by the fact that the clamping points are formed by the contact lines in each case of two spherical, for example partially cylindrical, clamping surfaces rolling off one another with intermediate clamping of the flat material.
- the flat material is clamped flat over a certain width due to its flexibility at the clamping points.
- the change in distance between the bending edges is positively controlled as a function of their relative displacement position to the compression edge. This makes it possible to optimize the sequence of movements of the bending edges relative to the upsetting edge in such a way that the carton is drawn in largely without tension during the upsetting process.
- a preferred device for carrying out the method according to the invention has two tools which act from opposite sides against the flat material and are displaceable relative to one another, preferably designed as upper and lower tools.
- the first of these tools contains a centrally arranged elongated compression tongue which forms a compression and fold edge, and two contact surfaces which are arranged next to the compression tongue for the flat material parts projecting laterally on the joint hinges to be produced.
- the second tool is provided with two elongated bending jaws, which are offset on both sides of the upsetting tongue and each have a bending edge that is parallel to the upsetting and folding edge can be moved towards one another in the course of the relative displacement movement of the tools in the direction of the compression tongue.
- the solution according to the invention in such a device is that the bending jaws of the second tool are provided with clamping surfaces, which can be pressed against the contact surfaces of the first molding tool in an aligned alignment with intermediate clamps of the protruding flat material parts, so that the parts carrying the clamping and contact surfaces are used for Execution of a synchronous transverse movement can be coupled to one another in pairs and are pivotably connected to the respective tools about pivot axes parallel to the upsetting and bending edges, while the clamping and contact surfaces have a spherical, preferably partially cylindrical, rolling shape in pairs with intermediate clamps of the flat material.
- the contact surfaces of the first tool are arranged on pressure pieces which, under the action of the bending jaws striking with its clamping surfaces, can be displaced relative to the compression tongue against the force of a spring.
- the contact and clamping surfaces are advantageously in the area of their clamping points which bear against the protruding flat material parts arranged in a common, preferably horizontally oriented tangent plane.
- the pressure pieces can be articulated on a spring base that can be displaced relative to the compression tongue against the force of a spring.
- the bending jaws and / or the pressure pieces which can be coupled with these can be pivoted in pairs against one another about their pivot axes against the force of a spring, each defining the opening width of the bending edges when they strike the flat material, preferably adjustable.
- the pivot axes of the bending jaws and pressure pieces pressed in pairs with respect to the compression tongue are arranged outside the clamping points of their clamping and contact surfaces lying against one another with intermediate clamping of the flat material, then in the course of the compression process the bending jaws and pressure pieces will be in Torque directed towards the upset tongue about its swivel axes, which triggers the desired transverse movement.
- the bending jaws are positively guided to the side of the compression tongue along a curve that defines the transverse movement as a function of the displacement path.
- the bending jaws can be articulated on a tappet forming the upper tool, while the curve is arranged in a fixed manner relative to the tappet.
- the upsetting device shown in the drawing is intended for the production of hinge hinges 10 in flat material 12, which are groove-shaped on one side, from cardboard, optionally laminated with plastic, paper, textile tape or leather.
- the upsetting device essentially comprises a lower tool 18 provided with a machine-fixed, elongated compression tongue 14 and two elongated pressure pieces 16 arranged laterally next to the compression tongue 14 and an upper tool 22 arranged above the lower tool 18 and displaceable against the lower tool and provided with bending jaws 20 pointing downwards.
- the pressure pieces 16 are articulated on a spring base 28 which can be pressed against the force of springs 24 relative to the machine frame 26 and the compression tongue 14 under the action of the descending upper tool 22, about axes 30 parallel to the longitudinal extension of the compression tongue 14.
- a pressure spring 32 acts between the pressure pieces 16 and holds the pressure pieces outward against adjustable stops 34 in the open position.
- the bending jaws 20 are arranged on an up and down movable plunger 36 so as to be pivotable about axes 38 parallel to the axes 30. In their open position shown in FIG. 1, they are held against adjustable stops 42 under the action of a compression spring 40. The stops 42 define the opening width of the bending jaws 20 when their bending edges 44 strike the flat material 12 lying on the lower tool 18 in the region of the contact surfaces 46 and the compression edge 48 at the beginning of the upsetting process.
- the bending jaws 20 and the pressure pieces 16 become locked by means of schematically illustrated locking members 50 in pairs so that they carry out a sliding friction-free coupled transverse movement about their axes 30, 38 with sandwiched flat material 12.
- the clamping surface 52 of the bending jaws 20 pressing against the top of the flat material 12 and the contact surfaces 46 of the pressure pieces 16 pressing against the underside of the flat material 12 are spherical, preferably partially cylindrical.
- the pressure pieces are displaced downwards by clamping the flat material 12 by moving the spring base 28 against the force of the springs 24 in such a way that the compression tongue 14 with its compression edge 48 dips into the flat material 12 from below forming a groove.
- the one available for grooving Material is limited by the opening dimension between the bending edges 44 of the bending jaws 20 when it hits the flat material 12.
- the flat material parts 12 'protruding laterally beyond the bending edges 44 are held in a horizontal orientation between the clamping and contact surfaces 52, 46 which lie against one another in pairs.
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Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Erzeugung von auf der einen Seite rillenförmigen und auf der anderen Seite wulstförmigen Gelenkscharnieren in Flachmaterial aus gegebenenfalls mit Kunststoffolie, Papier, Textilband und/oder Leder überzogenem Karton.The invention relates to a method and a device for producing hinged hinges on the one side and bulges on the other side in flat material made of cardboard, optionally covered with plastic film, paper, textile tape and / or leather.
Gelenkscharniere dieser Art werden vor allem an Ordnerdeckeln,Bucheinbänden, Kartonschachteln mit Klappdeckelverschlüssen und dergleichen benötigt. Der für die Herstellung des Flachmaterials verwendete Karton besteht aus mehreren, in einem kombinierten Faser- und Klebeverbund miteinander verbundenen Papierlagen, die an ihrer Oberfläche mit einer Kunststoff-, Papier-, Textil-und/oder Lederkaschierung veredelt werden können. Zur Erzeugung der Gelenkscharniere ist es bekannt, daß das Flachmaterial rillenseitig durch eine in das Flachmaterial eintauchende Stauchkante gestaucht und zugleich unter Bildung der Rille gefalzt wird und wulstseitig an zwei in gleichem Abstand beidseitig der Stauchkante um je eine zur Stauchkante parallele Biegekante in zur Falzung entgegengesetzter Richtung unter Bildung von Wulstaußenkanten biegeverformt wird, wobei während des Eintauchens der Stauchkante der gegenseitige Abstand zwischen den Biegekanten verkleinert wird. Im Verlauf des kombinierten Stauch-, Falz- und Biegevorgangs wird das seitlich über die Stauchkante überstehende Flachmaterial durch die relativ zur Stauchkante verschiebbaren Biegekanten gegen seitlich neben der Stauchkante angeordnete Widerlagerflächen gepreßt. Die Widerlagerflächen sind dort unter Einschluß eines stumpfen Winkels schräg zueinander ausgerichtet und dienen als schiefe Ebenen, auf denen die Biegekanten im Zuge der Verschiebebewegung unter Verkleinerung ihres gegenseitigen Abstandes zur Stauchkante hin verschoben werden. Dabei wird das durch die spitzen Biegekanten erfaßte Flachmaterial relativ zu den Widerlagerflächen unter Überwindung einer Reibungskraft verschoben. Je nach Materialzusammensetzung des Flachmaterials kann es dabei zu Oberflächenüberdehnungen, Oberflächenverletzungen und zu Verspannungen innerhalb des Flachmaterials kommen. Die inneren Verspannungen haben wiederum einen Einfluß auf die Rückstellkraft im Bereich des Gelenkscharniers, die zu einem unerwünschten selbsttätigen Öffnen im Scharnierbereich, beispielsweise zum selbsttätigen Aufklaffen von Ordnerdeckeln, führen kann. Weiter wird bei dem bekannten Verfahren als nachteilig empfunden, daß die über den Scharnierbereich überstehenden Flachmaterialteile wegen der schräg gegeneinander angestellten Widerlagerflächen im Verlauf des Falz- und Biegevorgangs von einer ebenen Strecklage aus in eine Winkellage gegeneinander verschwenkt werden, die beim anschließenden Weitertransport wieder rückgängig gemacht werden muß. Für diesen Schwenkvorgang sind zusätzliche maschinelle Hilfsmittel, wie hin- und hergehende Anschlag- und Niederhaltestempel erforderlich, die im Hinblick auf die hierbei zu bewegenden Massen taktzeitbegrenzend wirken können.Articulated hinges of this type are required above all on file covers, book covers, cardboard boxes with hinged cover closures and the like. The cardboard used for the production of the flat material consists of several paper layers which are connected to one another in a combined fiber and adhesive bond and which can be finished on their surface with a plastic, paper, textile and / or leather lamination. To produce the articulated hinges, it is known that the flat material is compressed on the groove side by a compression edge which is immersed in the flat material and at the same time is folded to form the groove and on the bead side on two sides at the same distance on both sides of the compression edge by one bending edge parallel to the compression edge in the opposite direction to the fold is deformed to form outer bead edges, the mutual distance between the bending edges being reduced during the immersion of the upsetting edge. In the course of the combined upsetting, folding and bending process, that which protrudes laterally beyond the upsetting edge becomes Flat material is pressed by the bending edges, which can be displaced relative to the upsetting edge, against abutment surfaces arranged laterally next to the upsetting edge. The abutment surfaces are aligned obliquely to one another, including an obtuse angle, and serve as inclined planes on which the bending edges are displaced in the course of the displacement movement while reducing their mutual distance from the compression edge. The flat material gripped by the sharp bending edges is displaced relative to the abutment surfaces while overcoming a frictional force. Depending on the material composition of the flat material, surface expansion, surface damage and tension within the flat material can occur. The internal tensions in turn have an influence on the restoring force in the area of the hinge, which can lead to an undesired automatic opening in the hinge area, for example to the automatic opening of folder covers. Furthermore, it is perceived as a disadvantage in the known method that the flat material parts projecting beyond the hinge area are pivoted against one another in the course of the folding and bending process from a flat stretching position into an angular position due to the obliquely opposed abutment surfaces, which are reversed again during the subsequent further transport got to. For this swiveling process, additional mechanical aids such as reciprocating stop and hold-down stamps are required, which can limit the cycle time with regard to the masses to be moved.
Weiter ist es zur Herstellung von Sicken in Flachmaterial aus Blech oder Kunststoff an sich bekannt (FR-A-1259214), zwei von einander gegenüberliegenden Seiten gegen das Flachmaterial einwirkende, relativ zueinander verschiebbare, als Ober- und Unterwerkzeuge ausgebildete Werkzeuge vorzusehen, deren erstes Werkzeug eine mittig angeordnete, langgestreckte, eine Prägekante bildende Prägezunge sowie zwei neben der Prägezunge angeordnete Anlageflächen für die an den zu erzeugenden Sicken seitlich überstehenden Flachmaterialteile aufweist, und deren zweites Werkzeug mit zwei gegenüber der Prägezunge beidseitig versetzt angeordneten, jeweils eine zur Prägekante parallele Biegekante aufweisenden, langgestreckten Biegebacken versehen ist, wobei die Biegebacken im Verlauf der relativen Verschiebebewegung in Richtung Prägezunge aufeinanderzu bewegbar und mit Klemmflächen versehen sind, die unter Zwischenklemmen der überstehenden Flachmaterialteile in miteinander fluchtender Ausrichtung gegen die Anlagefläche des ersten Werkzeugs anpreßbar sind, und wobei die die Klemm- und Anlageflächen tragenden Teile zur Ausführung einer synchronen Querbewegung paarweise miteinander kuppelbar sind. Die Klemm- und Anlageflächen der Biegebacken sind dort eben ausgebildet, so daß die Klemmstellen während des gesamten Prägevorgangs unverändert bleiben.Furthermore, for the production of beads in flat material made of sheet metal or plastic (FR-A-1259214), it is known to provide two tools which act against the flat material from opposite sides and are displaceable relative to one another and designed as upper and lower tools, the first tool of which has a centrally arranged, elongated embossing tongue forming an embossing edge and two contact surfaces arranged next to the embossing tongue for the flat material parts projecting laterally on the beads to be produced, and the second tool of which has two bending edges which are offset on both sides of the embossing tongue and each have a bending edge parallel to the embossing edge, Elongated bending jaws is provided, wherein the bending jaws can be moved towards one another in the course of the relative displacement movement in the direction of the embossing tongue and are provided with clamping surfaces which, with intermediate clamping of the protruding flat material parts, are aligned with one another are pressed against the contact surface of the first tool, and the parts carrying the clamping and contact surfaces can be coupled in pairs to carry out a synchronous transverse movement. The clamping and contact surfaces of the bending jaws are flat there so that the clamping points remain unchanged during the entire stamping process.
Weiter ist es bei einer Blechbiegemaschine ähnlicher Art an sich bekannt (FR-A-1218481), die Biegebacken mit einer gekrümmten Klemm- und Anlagefläche zu versehen.Furthermore, it is known per se in a sheet metal bending machine of a similar type (FR-A-1218481) to provide the bending jaws with a curved clamping and contact surface.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Erzeugung von Gelenkscharnieren im Karton der eingangs angegebenen Art zu entwickeln, womit ein leichtgängiges Scharnier mit nur geringen Rückstellkräften erzeugt, Oberflächenbeschädigungen im Scharnierbereich vermieden und ein störendes Hochklappen der überstehenden Flachmaterialteile während des Stauchvorgangs verhindert werden können.The invention has for its object a method and to develop a device for producing articulated hinges in the cardboard box of the type specified at the outset, with which a smooth-running hinge with only low restoring forces is generated, surface damage in the hinge area can be avoided and a disruptive folding up of the protruding flat material parts during the upsetting process can be prevented.
Die erfindungsgemäße Lösung geht von dem Gedanken aus, daß während des Stauchvorgangs eine Gleitbewegung zwischen dem Flachmaterial und den andrückenden Werkzeugen vermieden werden muß, um eine spannungsfreie Auflockerung des Faserverbunds und eine störungsfreie Oberflächenhandhabung im Scharnierbereich zu gewährleisten. Gemäß der Erfindung wird dies dadurch erreicht, daß die über die Wulstaußenkanten überstehenden Flachmaterialteile unabhängig voneinander an in der Nähe der benachbarten Biegekanten angeordneten Klemmstellen eingespannt und beim Eintauchen der Stauchkante in das Flachmaterial in miteinander fluchtender Ausrichtung aufeinanderzu bewegt werden, wobei die Klemmstellen zu Beginn des Eintauchvorgangs mit der Biegekante zusammenfallen und im Verlauf der Abstandsverkleinerung zwischen den Biegekanten gleitreibungsfrei auf den über die Wulstaußenkanten überstehenden Flachmaterialteilen nach außen bewegt werden. Diese Verfahrensweise hat zusätzlich den Vorteil, daß die überstehenden Flachmaterialteile im Verlauf des Stauchvorgangs nicht gegeneinander verschwenkt werden müssen.The solution according to the invention is based on the idea that a sliding movement between the flat material and the pressing tools must be avoided during the upsetting process in order to ensure tension-free loosening of the fiber composite and trouble-free surface handling in the hinge area. According to the invention, this is achieved in that the flat material parts protruding over the bead outer edges are clamped independently of one another at clamping points arranged in the vicinity of the adjacent bending edges and are moved towards one another in flush alignment when the compression edge is immersed in the flat material, the clamping points at the beginning of the immersion process coincide with the bending edge and are moved outward in the course of the reduction in the distance between the bending edges without sliding friction on the flat material parts protruding beyond the outer edge of the bead. This procedure has the additional advantage that the protruding flat material parts do not have to be pivoted against one another in the course of the upsetting process.
Der Abstand zwischen den Klemmstellen kann dabei während der Abstandsverkleinerung der Biegekanten etwa gleich bleiben. Letzteres wird dadurch ermöglicht, daß die Klemmstellen durch die Anlagelinien jeweils zweier unter Zwischenklemmen des Flachmaterials aufeinander abrollender, balliger, beispielsweise teilzylindrischer Klemmflächen gebildet wird. Grundsätzlich wird das Flachmaterial aufgrund seiner Nachgiebigkeit an den Klemmstellen über eine gewisse Breite flächig eingespannt.The distance between the clamping points can be approximately during the reduction in the distance of the bending edges stay the same. The latter is made possible by the fact that the clamping points are formed by the contact lines in each case of two spherical, for example partially cylindrical, clamping surfaces rolling off one another with intermediate clamping of the flat material. Basically, the flat material is clamped flat over a certain width due to its flexibility at the clamping points.
Gemäß einer weiteren bevorzugten Ausgestaltung der Erfindung wird die Abstandsveränderung zwischen den Biegekanten in Abhängigkeit von ihrer relativen Verschiebelage zur Stauchkante zwangsgesteuert. Dadurch ist es möglich, den Bewegungsablauf der Biegekanten relativ zur Stauchkante so zu optimieren, daß der Kartoneinzug während des Stauchvorgangs weitgehend spannungsfrei erfolgt.According to a further preferred embodiment of the invention, the change in distance between the bending edges is positively controlled as a function of their relative displacement position to the compression edge. This makes it possible to optimize the sequence of movements of the bending edges relative to the upsetting edge in such a way that the carton is drawn in largely without tension during the upsetting process.
Eine bevorzugte Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens weist zwei von einander gegenüberliegenden Seiten gegen das Flachmaterial einwirkende, relativ zueinander verschiebbare, vorzugsweise als Ober- und Unterwerkzeuge ausgebildete Werkzeuge auf. Das erste dieser Werkzeuge enthält eine mittig angeordnete langgestreckte, eine Stauch- und Falzkante bildende Stauchzunge sowie zwei neben der Stauchzunge angeordnete Anlageflächen für die an den zu erzeugenden Gelenkscharnieren seitlich überstehenden Flachmaterialteile. Das zweite Werkzeug ist mit zwei gegenüber der Stauchzunge beidseitig versetzt angeordneten, jeweils eine zur Stauch- und Falzkante parallele Biegekante aufweisenden, langgestreckten Biegebacken versehen, die im Verlauf der relativen Verschiebebewegung der Werkzeuge in Richtung Stauchzunge aufeinanderzu bewegbar sind. Die erfindungsgemäße Lösung besteht bei einer solchen Vorrichtung darin, daß die Biegebacken des zweiten Werkzeugs mit Klemmflächen versehen sind, die unter Zwischenklemmen der überstehenden Flachmaterialteile in miteinander fluchtender Ausrichtung gegen die Anlageflächen des ersten Formwerkzeugs anpreßbar sind, daß die die Klemm- und Anlageflächen tragenden Teile zur Ausführung einer synchronen Querbewegung paarweise miteinander kuppelbar und um zu den Stauch- und Biegekanten parallele Schwenkachsen schwenkbar an den jeweiligen Werkzeugen angelenkt sind, während die Klemm- und Anlageflächen eine ballige, vorzugsweise teilzylindrische, paarweise unter Zwischenklemmen des Flachmaterials aufeinander abrollende Gestalt aufweisen. Mit diesen Maßnahmen wird erreicht, daß die Klemmstellen zwischen den Klemm- und Anlageflächen zu Beginn des Stauchvorgangs mit der Biegekante zusammenfallen und im Verlauf der Abstandsverkleinerung zwischen den Biegekanten gleitreibungsfrei auf den über die Wulstaußenkanten überstehenden Flachmaterialteilen nach außen bewegt werden.A preferred device for carrying out the method according to the invention has two tools which act from opposite sides against the flat material and are displaceable relative to one another, preferably designed as upper and lower tools. The first of these tools contains a centrally arranged elongated compression tongue which forms a compression and fold edge, and two contact surfaces which are arranged next to the compression tongue for the flat material parts projecting laterally on the joint hinges to be produced. The second tool is provided with two elongated bending jaws, which are offset on both sides of the upsetting tongue and each have a bending edge that is parallel to the upsetting and folding edge can be moved towards one another in the course of the relative displacement movement of the tools in the direction of the compression tongue. The solution according to the invention in such a device is that the bending jaws of the second tool are provided with clamping surfaces, which can be pressed against the contact surfaces of the first molding tool in an aligned alignment with intermediate clamps of the protruding flat material parts, so that the parts carrying the clamping and contact surfaces are used for Execution of a synchronous transverse movement can be coupled to one another in pairs and are pivotably connected to the respective tools about pivot axes parallel to the upsetting and bending edges, while the clamping and contact surfaces have a spherical, preferably partially cylindrical, rolling shape in pairs with intermediate clamps of the flat material. With these measures it is achieved that the clamping points between the clamping and contact surfaces coincide with the bending edge at the beginning of the upsetting process and are moved outward in the course of the reduction in distance between the bending edges without sliding friction on the flat material parts projecting beyond the outer edges of the beads.
Gemäß einer bevorzugten Ausgestaltung der erfindungsgemäßen Vorrichtung sind die Anlageflächen des ersten Werkzeugs an Druckstücken angeordnet, die unter der Einwirkung der mit seinen Klemmflächen anschlagenden Biegebacken entgegen der Kraft einer Feder relativ zur Stauchzunge verschiebbar sind. Vorteilhafterweise sind die Anlage- und Klemmflächen im Bereich ihrer gegen die überstehenden Flachmaterialteile anliegenden Klemmstellen in einer gemeinsamen, vorzugsweise horizontal ausgerichteten Tangentenebene angeordnet.According to a preferred embodiment of the device according to the invention, the contact surfaces of the first tool are arranged on pressure pieces which, under the action of the bending jaws striking with its clamping surfaces, can be displaced relative to the compression tongue against the force of a spring. The contact and clamping surfaces are advantageously in the area of their clamping points which bear against the protruding flat material parts arranged in a common, preferably horizontally oriented tangent plane.
Die Druckstücke können an einem relativ zur Stauchzunge entgegen der Kraft einer Feder verschiebbaren Federboden angelenkt sein. Vorteilhafterweise können die Biegebacken und/oder die mit diesen kuppelbaren Druckstücke zwischen je einem die Öffnungsbreite der Biegekanten beim Auftreffen auf das Flachmaterial definierenden, vorzugsweise einstellbaren Anschlag entgegen der Kraft einer Feder um ihre Schwenkachsen paarweise aufeinanderzu verschwenkt werden. Wenn gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung die Schwenkachsen der paarweise gegeneinander gepreßten Biegebacken und Druckstücke in bezug auf die Stauchzunge außerhalb der Klemmstellen ihrer unter Zwischenklemmen des Flachmaterials gegeneinander anliegenden Klemmund Anlageflächen angeordnet sind, so wird im Verlauf des Stauchvorgangs auf die Biegebacken und Druckstücke ein in Richtung Stauchzunge gerichtetes Drehmoment um ihre Schwenkachsen ausgeübt, durch das die gewünschte Querbewegung ausgelöst wird. Um einen spannungsfreien Kartoneinzug im Scharnierbereich zu gewährleisten, sind die Biegebacken zur Seite der Stauchzunge hin entlang einer die Querbewegung in Abhängigkeit vom Verschiebeweg definierenden Kurve zwangsgeführt. Die Biegebacken können dabei an einem das Oberwerkzeug bildenden Stößel angelenkt sein, während die Kurve gegenüber dem Stößel feststehend angeordnet ist.The pressure pieces can be articulated on a spring base that can be displaced relative to the compression tongue against the force of a spring. Advantageously, the bending jaws and / or the pressure pieces which can be coupled with these can be pivoted in pairs against one another about their pivot axes against the force of a spring, each defining the opening width of the bending edges when they strike the flat material, preferably adjustable. If, according to a further advantageous embodiment of the invention, the pivot axes of the bending jaws and pressure pieces pressed in pairs with respect to the compression tongue are arranged outside the clamping points of their clamping and contact surfaces lying against one another with intermediate clamping of the flat material, then in the course of the compression process the bending jaws and pressure pieces will be in Torque directed towards the upset tongue about its swivel axes, which triggers the desired transverse movement. In order to ensure tension-free carton feeding in the hinge area, the bending jaws are positively guided to the side of the compression tongue along a curve that defines the transverse movement as a function of the displacement path. The bending jaws can be articulated on a tappet forming the upper tool, while the curve is arranged in a fixed manner relative to the tappet.
Im folgenden wird die Erfindung anhand eines in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:
- Fig. 1
- Einen Schnitt durch eine Stauchvorrichtung im geöffneten Zustand;
- Fig. 2
- die Stauchvorrichtung nach Fig. 1 im Stauchzustand.
- Fig. 1
- A section through a compression device in the open state;
- Fig. 2
- 1 in the upset state.
Die in der Zeichnung dargestellte Stauchvorrichtung ist zur Erzeugung von auf der einen Seite rillenförmigen Gelenkscharnieren 10 in Flachmaterial 12 aus gegebenenfalls mit Kunststoff, Papier, Textilband oder Leder kaschiertem Karton bestimmt. Die Stauchvorrichtung umfaßt im wesentlichen ein mit einer maschinenfesten, langgestreckten Stauchzunge 14 und zwei seitlich neben der Stauchzunge 14 angeordneten langgestreckten Druckstücken 16 versehenes Unterwerkzeug 18 und ein oberhalb des Unterwerkzeugs 18 angeordnetes gegen das Unterwerkzeug verschiebbares, mit nach unten weisenden Biegebacken 20 versehenes Oberwerkzeug 22.The upsetting device shown in the drawing is intended for the production of
Die Druckstücke 16 sind an einem entgegen der Kraft von Federn 24 relativ zum Maschinengestell 26 und zur Stauchzunge 14 unter der Einwirkung des niedergehenden Oberwerkzeugs 22 niederdrückbaren Federboden 28 um zur Längserstreckung der Stauchzunge 14 parallele Achsen 30 schwenkbar angelenkt. Zwischen den Druckstücken 16 wirkt eine Druckfeder 32, die die Druckstücke in der Offenstellung nach außen gegen einstellbare Anschläge 34 hält.The
Die Biegebacken 20 sind an einem auf und ab bewegbaren Stößel 36 um zu den Achsen 30 parallele Achsen 38 schwenkbar angeordnet. In ihrer in Fig. 1 gezeigten Offenstellung werden sie unter der Einwirkung einer Druckfeder 40 gegen einstellbare Anschläge 42 gehalten. Die Anschläge 42 definieren die Öffnungsweite der Biegebacken 20 beim Auftreffen ihrer Biegekanten 44 auf das zu Beginn des Stauchvorgangs auf dem Unterwerkzeug 18 im Bereich der Anlageflächen 46 und der Stauchkante 48 aufliegende Flachmaterial 12. Beim Niedergehen des Stößels 36 werden die Biegebacken 20 und die Druckstücke 16 durch schematisch dargestellte Verriegelungsorgane 50 paarweise so miteinander verriegelt, daß sie bei zwischengeklemmtem Flachmaterial 12 eine gleitreibungsfreie gekoppelte Querbewegung um ihre Achsen 30,38 ausführen. Um ein gegenseitiges Abrollen zu ermöglichen, sind die gegen die Oberseite des Flachmaterials 12 andrückende Klemmfläche 52 der Biegebacken 20 und die gegen die Unterseite des Flachmaterials 12 andrückenden Anlageflächen 46 der Druckstücke 16 ballig, vorzugsweise teilzylindrisch ausgebildet.The
Beim Auftreffen des von oben nach unten verschobenen Oberwerkzeugs 22 mit den Biegebacken 20 auf den Druckstücken 16 werden die Druckstücke unter Zwischenklemmen des Flachmaterials 12 durch Verschieben des Federbodens 28 gegen die Kraft der Federn 24 so nach unten verschoben, daß die Stauchzunge 14 mit ihrer Stauchkante 48 von unten her rillenbildend in das Flachmaterial 12 eintaucht. Das für die Rillenbildung zur Verfügung stehende Material wird durch das Öffnungsmaß zwischen den Biegekanten 44 der Biegebacken 20 beim Auftreffen auf das Flachmaterial 12 begrenzt. Die seitlich über die Biegekanten 44 überstehenden Flachmaterialteile 12' werden zwischen den paarweise gegeneinander anliegenden Klemm- und Anlageflächen 52,46 in horizontaler Ausrichtung gehalten. Gleichzeitig werden die Biegebacken und Druckstücke unter der Einwirkung eines beim Niedergehen des Oberwerkzeugs ausgeübten Drehmoments um die Achsen 30,38 unter Ausführung eines kombinierten Falz- und Biegevorgangs im Scharnierbereich 10 entgegen der Kraft der Druckfedern 32,40 gegen die Stauchzunge 14 nach innen bewegt. Dieser Bewegungsablauf wird über maschinenfeste Kurven 54, gegen die die Biegebacken 20 in Richtung Stanzzunge 14 anliegen, mit dem Ziel eines spannungsfreien Kartoneinzugs im Scharnierbereich optimal zwangsgesteuert.When the
Claims (13)
- Method of making hinges, which are grooved on one side and beaded on the other side, in flat material comprising cardboard possibly covered with plastic film, paper, fabric tape and/or leather, whereby the flat material, on the grooved side, is upset by the dipping of an upsetting edge into the flat material and simultaneously folded to form the groove and, on the beaded side, is deformed by bending at two points, which lie on either side of and equidistant from the upsetting edge, in each case around a bending edge parallel to the upsetting edge in the opposite direction to the folding process to form bead outer edges, with the mutual distance between the bending edges being reduced in the course of dipping of the upsetting edge into the flat material, characterized in that the flat material parts (12') projecting over the bead outer edges are clamped independently of one another at clamping points disposed in the vicinity of the adjacent bending edges (44) and on dipping of the upsetting edge (48) into the flat material (12) are moved, in flush alignment with one another, towards one another, and that the clamping points at the start of the dipping process coincide with the bending edge (44) and in the course of the reduction in the distance between the bending edges are moved outwards without sliding friction along the flat material parts (12') projecting over the bead outer sides.
- Method according to claim 1, characterized in that the distance between the clamping points remains substantially constant during the reduction in the distance between the bending edges (44).
- Method according to claim 1 or 2, characterized in that the clamping points are formed by the contact lines of, in each case, two crowned, e.g. pitch-cylindrical clamping surfaces (46, 52) which roll on one another, simultaneously clamping the flat material between them.
- Method according to one of claims 1 to 3, characterized in that the flat material (12) is clamped two-dimensionally at the clamping points.
- Method according to one of claims 1 to 4, characterized in that the variation in the distance between the bending edges (44) is positively controlled as a function of their displacement position relative to the upsetting edge (48).
- Device for making hinges, which are grooved on one side and beaded on the other side, in flat material comprising cardboard possibly covered with plastic film, paper, fabric tape and/or leather, having two tools (18, 22), preferably in the form of a top and a bottom tool, acting towards the flat material from opposite directions and displaceable relative to one another, of which the first tool (18) has a centrally disposed, elongated upsetting tongue (14), which forms an upsetting and folding edge (48), as well as two contact surfaces (46), which are disposed next to the upsetting tongue (14), for the laterally projecting flat material parts (12') at the hinges (10) which are to be produced, and the second tool (22) is provided with two elongated bending jaws (20) which are disposed offset on either side of the upsetting tongue (14) and each have a bending edge (44) parallel to the upsetting and folding edge (48), the bending jaws in the course of the relative displacement movement of the tools (18, 22) in the direction of the upsetting tongue (14) being movable towards one another, characterized in that the bending jaws (20) of the second tool (22) are provided with clamping surfaces (52) which may be pressed in flush alignment with one another towards the contact surface (46) of the first tool (18), simultaneously clamping between them the projecting flat material parts (12'), that the parts (20, 16) carrying the clamping and contact surfaces (52, 46) are connectable in pairs to one another for the execution of a synchronous transverse movement and are hinged on the respective tools (18, 22) so as to be capable of swivelling about swivelling axes (30, 38) parallel to the upsetting and bending edges (48, 44), and that the clamping and contact surfaces (52, 46) have a crowned, preferably pitch-cylindrical form and roll in pairs on one another, simultaneously clamping between them the flat material.
- Device according to claim 6, characterized in that the contact surfaces (46) of the first tool (18) are disposed on thrust pieces (16) which, under the effect of the bending jaws (20) striking with its clamping surfaces (52), are displaceable relative to the upsetting tongue (14) counter to the force of a spring (24).
- Device according to claim 6 or 7, characterized in that the contact and clamping surfaces (46, 52) in the region of their clamping points lying against the projecting flat material parts (12') are disposed in a common, preferably horizontally aligned tangent plane.
- Device according to one of claims 6 to 8, characterized in that the thrust pieces are hinged on a spring base (28) which is displaceable relative to the upsetting zone (14) counter to the force of a spring (24).
- Device according to one of claims 6 to 9, characterized in that the bending jaws (20) and/or the thrust pieces (16) which may be coupled with said jaws are capable of swivelling in pairs towards one another about their swivelling axes (38, 30), counter to the force of a spring (40 or 32), in each case between a preferably adjustable stop (42 or 34) which defines the opening width of the bending edges (44) on striking the flat material (12).
- Device according to one of claims 6 to 10, characterized in that the swivelling axes (30, 38) of the bending jaws (20) and thrust pieces (16) which are pressed towards one another are disposed - in relation to the upsetting tongue (14) - outside of the clamping points of their clamping and contact surfaces (46, 52) which lie against one another, clamping the flat material between them.
- Device according to one of claims 6 to 11, characterized in that the bending jaws (20) are positively guided towards the side of the upsetting tongue (14) along a curve (54) which defines the transverse movement as a function of the displacement travel.
- Device according to one of claims 6 to 12, characterized in that the bending jaws (20) are hinged on a plunger (36) which forms the top tool (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3936393 | 1989-11-02 | ||
| DE3936393 | 1989-11-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0426188A1 EP0426188A1 (en) | 1991-05-08 |
| EP0426188B1 true EP0426188B1 (en) | 1994-03-23 |
Family
ID=6392673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90120988A Expired - Lifetime EP0426188B1 (en) | 1989-11-02 | 1990-11-02 | Method and device for making hinges in flat cardboard material |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0426188B1 (en) |
| DE (2) | DE4034865A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9414170D0 (en) * | 1994-07-13 | 1994-08-31 | Aston Packaging Ltd | Hinged clip and fitted article |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE115638C (en) * | ||||
| FR799742A (en) * | 1935-12-05 | 1936-06-18 | Zent S A Berne | Machine for the manufacture in a single operation of corrugated sheets intended to be welded together to form radiators |
| US2524584A (en) * | 1949-10-18 | 1950-10-03 | Shellmar Products Corp | Method of forming containers |
| FR1218481A (en) * | 1958-12-01 | 1960-05-11 | Achard | Sheet metal pleating machine |
| FR1252082A (en) * | 1959-10-16 | 1961-01-27 | Merlin Gerin | Folding machine |
| FR1263363A (en) * | 1960-04-26 | 1961-06-09 | Merlin Gerin | Continuous Strip Pleating Machine |
| FR1259214A (en) * | 1960-06-07 | 1961-04-21 | Aluminium Roofing Proprietary | Method and device for folding and shaping sheets |
| FR1294242A (en) * | 1961-04-12 | 1962-05-26 | Comp Generale Electricite | Calender plate crimping machine |
| US3461711A (en) * | 1964-09-08 | 1969-08-19 | Frank R Ogilvie | Corrugating method and apparatus |
| US3479855A (en) * | 1967-07-19 | 1969-11-25 | Frank R Ogilvie | Corrugating machine |
| SE369870B (en) * | 1972-12-21 | 1974-09-23 | Sprinter Pack Ab |
-
1990
- 1990-11-02 DE DE4034865A patent/DE4034865A1/en not_active Withdrawn
- 1990-11-02 EP EP90120988A patent/EP0426188B1/en not_active Expired - Lifetime
- 1990-11-02 DE DE90120988T patent/DE59005092D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59005092D1 (en) | 1994-04-28 |
| EP0426188A1 (en) | 1991-05-08 |
| DE4034865A1 (en) | 1991-05-08 |
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