EP0349953A2 - Apparatus for working rod material - Google Patents

Apparatus for working rod material Download PDF

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Publication number
EP0349953A2
EP0349953A2 EP89112119A EP89112119A EP0349953A2 EP 0349953 A2 EP0349953 A2 EP 0349953A2 EP 89112119 A EP89112119 A EP 89112119A EP 89112119 A EP89112119 A EP 89112119A EP 0349953 A2 EP0349953 A2 EP 0349953A2
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EP
European Patent Office
Prior art keywords
bending
rod
mandrel
gap
holder
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Granted
Application number
EP89112119A
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German (de)
French (fr)
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EP0349953B1 (en
EP0349953A3 (en
Inventor
Heinz Ruhl
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete

Definitions

  • the invention relates to a device for processing bar material, such as reinforcing steel, comprising at least one bending slide which can be moved along the bar material and has a bending mandrel and a bending roller which can be rotated about said bar, and a counterholder which is preferably displaceable substantially perpendicular to the longitudinal axis of the bar material.
  • a corresponding device can be found, for example, in EP-A-0 238 026.
  • the device in this regard comprises two bending carriages, one of which is bent alternately with one bending carriage and the rod-shaped material is held with the other bending carriage.
  • a counter-holder is also provided in the area of the bending slide so that the rod-shaped material is not bent in an uncontrolled manner between the bending slide during bending.
  • the counterholders in the form of bolts or rollers, for example, can be gradually adjusted perpendicularly to the longitudinal axis of the rod material by inserting them into holes in a perforated strip arranged with respect to one another.
  • the counter-holder is designed exclusively essentially perpendicular to the longitudinal axis of the rod material and continuously adjustable.
  • the counter holder can be driven with an electromotive or mechanical drive for fixing in the desired position.
  • a possible counter embodiment is to be provided, which is driven by means of a spindle.
  • the setting of the counter-holder takes place automatically as a function of the diameter of the rod material to be bent and the diameters of the bending mandrel and / or bending roller.
  • the automatic setting can be program-controlled, which ensures that the rod material is always given the desired final shape depending on the materials and mandrels or rolls used. Consequently, the perforated strips known from the prior art are dispensable, and, as mentioned, can only be adjusted with great effort.
  • the setting can be determined by the distance between the tangents that the bending roller and mandrel form when they are in contact with the material, without the material being deformed.
  • a gap which clamps the rod material and is present approximately centrally between the bending slides.
  • the measure ensures that the material to be bent, coming from a template, is introduced into the gap in such a way that it lies on top of one another, so that when the material is gripped by the bending slide, it is ensured that the materials do not lie next to one another but only one above the other come. This in turn ensures that the materials always have the desired final shape within the permissible tolerances.
  • the gap can be delimited by two mutually parallel, preferably web-like clamping jaws, one of which has a clamping jaw facing an ejection direction to the diameter of the rods to be fixed materials is adjustable and can be pivoted in such a way that there is no obstruction when the bent material is ejected.
  • the gap can completely surround the material on the circumference, thereby ensuring that the material cannot slip out during bending and / or when the position of the gap changes.
  • the relevant measures mean that it is no longer necessary for one bending slide to hold the rod-shaped material while the other bending slide is being moved and vice versa. Rather, the clamping jaws delimiting the gap can hold the rod material in such a way that the bending slides can be moved at the same time without the bending shapes being adversely affected thereby.
  • the central arrangement of the clamping gap also ensures that they do not constitute a hindrance to the bending slide itself.
  • the material is preferably raised by means of at least one element such as a fork and / or the elements forming the gap and raised above the bending mandrel, so that the material can be bent in another direction.
  • the counterholder and the bending roller are adjusted at the same time.
  • a device (10) for bending rod-shaped material (12) is shown in a purely schematic representation.
  • the device (10) can have a structure, such as European patent applications 0 121 896 or 0 238 026 show it.
  • the device (10) consequently comprises two preferably displaceable bending slides (14) and (16), each of which has a bending mandrel (18) or (20) and a bending crank or bending roller (22) or (24) which can be pivoted about the center thereof .
  • each bending slide (14), (16) has additional brackets (26) and (28) which are essentially perpendicular to the material (12) running between the bending slides (14) and (16) and are continuously adjustable.
  • the counterholders (26) and (28) are aligned with the bending mandrels (18) and (20) by means of spindles (30) and (32) so that when Bending of the rod-shaped material prevents the material running between the bending mandrels (18) and (20) from bending.
  • spindles (30) and (32) so that when Bending of the rod-shaped material prevents the material running between the bending mandrels (18) and (20) from bending.
  • only that counter-holder of the bending slide needs to interact with the rod-shaped material (12) on which the material is bent.
  • the rod-shaped material is placed on so-called bending tables (34) or (36) in accordance with the drawing according to FIG. 1, it being important to ensure that when several materials (12) are bent at the same time, they are arranged one above the other. This is ensured by the features shown in FIGS. 3 to 5.
  • FIG. 2 shows a top view of the bending slide (14) with a bending table (34), bending mandrel (18) and bending roller or crank (22). Furthermore, the counter-holder (26) can be seen, which is infinitely adjustable by means of the spindle (30). The adjustability of the counter-holder (26) can preferably be set in a program-controlled manner as a function of the diameter of the material (12) to be bent, the diameter of the bending mandrel (18) and the diameter of the bending roller (22). This then ensures that the curved shapes match within the permissible tolerances.
  • the z. B. in a below the surface of the table (34) moved by the spindle holder is ensured with structurally simple means that an alignment to both sides of the rod-shaped material (12) is possible, so depending on the direction the material is bent.
  • the material (12) is bent counterclockwise, whereas the dashed representation is intended to indicate a clockwise bending process.
  • the counter-holder (26) is in the dashed position (38) to prevent uncontrolled bending of the material (12) from this side.
  • An element (31) with which the rod-shaped material (12) can be raised in order to be deposited on the opposite side of the bending mandrel (18) is furthermore drawn purely schematically. This opens up the possibility of bending the material (12) either clockwise or counterclockwise using structurally simple means.
  • the element (31) can be fork-shaped elements that can be raised by means of hydraulic cylinders, displaced parallel to the spindle (30) and then lowered again or vice versa.
  • the elements (31) can be lowered into the plane below the bending slide (14) and (16) in order not to hinder their movement. Synchronous displacement can also take place together with the bending slides (14) and (16).
  • FIGS. 3 to 5 show an embodiment of a device for bending rod-shaped material that preferably has two movable bending slides corresponding to those in FIG. 1. 4, these bending carriages (14) and (16) are shown in their outer end positions.
  • the rod-shaped material designated by the reference symbol (40) is fed from a material store (42) via a ramp-shaped slope (44) to a gap (46), the width of which can be adjusted depending on the diameter of the rod-shaped material (40). This ensures that the materials (40) which are to be bent at the same time are present one above the other in the gap (46), that is to say also one above the other between those which are not shown Bending roll and mandrel come to rest. This ensures that the materials to be bent all receive the same final shape.
  • the gap (46) is delimited by a vertically extending end section of the ramp-shaped slope (44) and by an adjustable and pivotable jaw element (50).
  • Arms (54) and (56) can be pivoted about an axis (52) laterally from the gap (50) and consequently also from the ramp-shaped slope (44), so that the bent material can be pivoted by pivoting the arms (54) and (56) to feed a tray (58).
  • a clamping device (60) is shown, by means of which the rod-shaped materials (12) are preferably clamped in the middle between the bending slides, not shown.
  • the clamping device comprises jaws (62) and (64) which surround the rod-shaped materials (12) on the circumference in the retracted state.
  • the jaw (62) has a nose (66) projecting in the direction of the jaw (64), which closes the gap (68) formed between the jaws (62) and (64) on the head side, that is to say the rod-shaped materials (12) on the top covers.
  • the jaw (62) is designed to be displaceable with respect to the jaw (64).
  • the nose (66) partially protrudes into a correspondingly adapted recess in the jaw (64) in order to ensure that even with larger gaps (68) they can be completely covered by the nose (66).
  • the jaw (62) is designed to be displaceable relative to the jaw (64) so as to achieve a desired gap width adjust. Furthermore, the unit consisting of the jaws (62) and (64) can be moved on the one hand perpendicular to the longitudinal axis of the rod materials, that is along the arrows (70), and on the other hand can be raised or lowered. This movement is caused, for example, by means of the cylinder (72). Lifting and lowering or shifting along the arrow (70) is necessary if, as shown in FIG. 2, the rod-shaped material (32) is to be folded over with respect to the bending mandrel (18), i.e. when the position changes from the solid representation in the dashed and vice versa. The various positions are also indicated in FIG. 5.
  • the raising or lowering of the material (12) takes place synchronously with the movement of the fork-shaped elements (31), so that it is ensured that the rod-shaped material is folded over to the required extent.
  • a procedure in this regard i.e. a left / right bend to e.g. To achieve a Z shape can be seen, for example, in FIG. 6.
  • Fig. 6 a the unbent rod-shaped material (12) is shown.
  • the bending roller (22) is bent around the mandrel (18).
  • Fig. 6 b) The bending roller is then retracted and the slide having the bending roller (22) and the bending mandrel (18) is moved to the position of the rod-shaped material in which a bend is to be made counterclockwise.
  • the rod-shaped material is then raised perpendicular to the plane of the drawing by means of the clamping device (60) or the fork-shaped elements (31).
  • the bending roller (22) is pivoted in the direction of the arrow (74).
  • the counter-holder (38) is also moved along the path (30), as indicated by the arrow (76).
  • the material (12) is moved along the arrow (78) and then lowered. This position is shown in Fig. 6 d).
  • the bending roller (22) is then rotated counterclockwise around the bending mandrel (18) in order to bend the material in the opposite direction, so that the Z shape shown in FIG. 6 e) is obtained.

Abstract

An apparatus for working rod material (12) is proposed, in which the material to be bent can be held in clamping fashion in a gap provided between two bending slides (14, 16). To bend the materials counterholders (26, 28), which are steplessly adjustable in a plane extending perpendicularly to the longitudinal axis of the material, are used. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Bearbeiten von Stangenmaterial wie Bewehrungsstählen umfassend zumindest einen entlang des Stangenmaterials verschiebbaren Biegeschlitten mit Biegedorn und um diesen drehbare Biegerolle sowie einen vorzugsweise im wesentlichen senkrecht zur Stangenmateriallängs­achse ortsveränderbaren Gegenhalter.The invention relates to a device for processing bar material, such as reinforcing steel, comprising at least one bending slide which can be moved along the bar material and has a bending mandrel and a bending roller which can be rotated about said bar, and a counterholder which is preferably displaceable substantially perpendicular to the longitudinal axis of the bar material.

Eine entsprechende Vorrichtung ist z.B. der EP-A-0 238 026 zu entnehmen. Die diesbezügliche Vorrichtung umfaßt zwei Biegeschlitten, von denen abwechselnd mit einem Biegeschlitten gebogen und mit dem anderen Biegeschlitten das stabförmige Material gehalten wird. Im Bereich des Biegeschlittens ist ferner ein Gegenhalter vorgesehen, damit beim Verbiegen das stabförmige Material nicht unkontrolliert zwischen den Biegeschlitten durchgebogen wird. Die Gegenhalter in Form von z.B. Bolzen oder Rollen können dabei stufenweise senkrecht zur Stangenmateriallängsachse verstellt werden, indem sie in zueinander angeordnete Bohrungen einer Lochleiste einsetzbar sind.A corresponding device can be found, for example, in EP-A-0 238 026. The device in this regard comprises two bending carriages, one of which is bent alternately with one bending carriage and the rod-shaped material is held with the other bending carriage. A counter-holder is also provided in the area of the bending slide so that the rod-shaped material is not bent in an uncontrolled manner between the bending slide during bending. The counterholders in the form of bolts or rollers, for example, can be gradually adjusted perpendicularly to the longitudinal axis of the rod material by inserting them into holes in a perforated strip arranged with respect to one another.

Um gegebenenfalls eine stufenlose Verstellbarkeit vorzunehmen, ist eine Biegemaschine bekannt, bei der die Lochleiste stufenlos parallel zur Längsachse des Stangenmaterials und schrittweise senkrecht zur Längsachse ortsveränderbar ist. Um die gewünsch­ten Positionen einzunehmen, sind aufwendige Justiermaßnahmen erforderlich, die häufig eine Reproduzierbarkeit nicht ermög­lichen.In order to make an infinitely variable adjustment, if necessary, a bending machine is known in which the perforated strip can be moved continuously parallel to the longitudinal axis of the bar material and gradually perpendicular to the longitudinal axis. In order to assume the desired positions, complex adjustment measures are required, which often do not allow reproducibility.

Auch wenn mit einer Vorrichtung der eingangs beschriebenen Art eine hohe Präzision der gewünschten Biegeformen erzielbar ist, können dann Schwierigkeiten auftreten, wenn das stabförmige Material einen geringen Durchmesser aufweist. In diesem Fall können die Stäbe nebeneinander rutschen, so daß die Biegerolle bzw. der Biegedorn für dasjenige Material scheinbar vergrößert ist, das nicht unmittelbar an diesem anliegt.Even if a high precision of the desired bending shapes can be achieved with a device of the type described at the outset, difficulties can arise if the rod-shaped material has a small diameter. In this case, the rods can slide next to each other, so that the bending roller or mandrel is apparently enlarged for the material that is not in direct contact with it.

Aufgabe der vorliegenden Erfindung ist es unter anderem, eine Vorrichtung der eingangs genannten Art so auszubilden, daß mit konstruktiv einfachen Mitteln der Gegenhalter jede gewünschte Position einnehmen kann, ohne daß Lochleisten Verwendung finden müssen, die entlang des zu biegenden Materials verschiebbar sind. Auch ist es Aufgabe der Erfindung sicherzustellen, daß Stangenmaterial, das gleichzeitig gebogen wird, stets übereinander während der Biegevorgänge zu liegen kommt. Ferner soll die Möglichkeit bestehen, daß problemlos ein Biegen zu beiden Seiten des Materials erfolgen kann.It is an object of the present invention, inter alia, to design a device of the type mentioned at the outset so that, with structurally simple means, the counter-holder can assume any desired position without the need to use perforated strips which can be moved along the material to be bent. It is also an object of the invention to ensure that rod material which is bent at the same time always comes to lie on top of one another during the bending processes. Furthermore, there should be the possibility that bending can easily take place on both sides of the material.

Die Aufgabe wird im wesentlichen dadurch gelöst, daß der Gegenhalter ausschließlich im wesentlichen senkrecht zu der Stangenmateriallängsachse und stufenlos verstellbar ausgebildet ist. Dabei kann der Gegenhalter mit einem elektromotorischen oder mechanischen Antrieb zum Festlegen in der gewünschten Position angetrieben sein. Als mögliche Ausführungsform ist ein Gegenhalter vorzusehen, der mittels einer Spindel angetrieben wird.The object is essentially achieved in that the counter-holder is designed exclusively essentially perpendicular to the longitudinal axis of the rod material and continuously adjustable. The counter holder can be driven with an electromotive or mechanical drive for fixing in the desired position. A possible counter embodiment is to be provided, which is driven by means of a spindle.

In hervorzuhebender Ausgestaltung der Erfindung erfolgt das Einstellen des Gegenhalters automatisch in Abhängigkeit von dem Durchmesser des zu biegenden Stangenmaterials und den Durchmessern von Biegedorn und/oder Biegerolle. Das auto­matische Einstellen kann dabei programmgesteuert erfolgen, wodurch sichergestellt ist, daß in Abhängigkeit der verwendeten Materialien und Biegedorne bzw. -rollen das Stangenmaterial stets die gewünschte Endform erfährt. Folglich sind die nach dem Stand der Technik bekannten Lochleisten entbehrlich, die zudem erwähntermaßen nur recht aufwendig einstellbar sind. Die Einstellung kann dabei durch den Abstand der Tangenten bestimmt werden, die Biegerolle und Biegedorn beim Anliegen an dem Material mit diesem bilden, ohne daß das Material verformt wird.In an embodiment of the invention to be emphasized, the setting of the counter-holder takes place automatically as a function of the diameter of the rod material to be bent and the diameters of the bending mandrel and / or bending roller. The automatic setting can be program-controlled, which ensures that the rod material is always given the desired final shape depending on the materials and mandrels or rolls used. Consequently, the perforated strips known from the prior art are dispensable, and, as mentioned, can only be adjusted with great effort. The setting can be determined by the distance between the tangents that the bending roller and mandrel form when they are in contact with the material, without the material being deformed.

Nach einem selbständigen Lösungsvorschlag ist bei einer Vorrichtung mit zwei Biegeschlitten, von denen zumindest einer verschiebbar ausgebildet ist, vorgesehen, daß bei Vorliegen der Biegeschlitten in ihren äußeren Endstellungen in etwa mittig zwischen den Biegeschlitten ein das Stangenmaterial klemmend aufnehmender Spalt vorhanden ist. Durch die Maßnahme wird sichergestellt, daß das zu biegende Material von einer Vorlage kommend derart in den Spalt eingebracht wird, daß ein Übereinanderliegen erfolgt, so daß beim Erfassen des Materials durch die Biegeschlitten sichergestellt ist, daß die Materialien nicht nebeneinander, sondern ausschließlich übereinander zu liegen kommen. Dies wiederum gewährleistet, daß die Materialien stets die gewünschte Endform innerhalb der zulässigen Toleranzen aufweisen.According to an independent proposed solution, in a device with two bending slides, of which at least one is designed to be displaceable, it is provided that when the bending slides are present in their outer end positions, a gap which clamps the rod material and is present approximately centrally between the bending slides. The measure ensures that the material to be bent, coming from a template, is introduced into the gap in such a way that it lies on top of one another, so that when the material is gripped by the bending slide, it is ensured that the materials do not lie next to one another but only one above the other come. This in turn ensures that the materials always have the desired final shape within the permissible tolerances.

In Ausgestaltung kann der Spalt von zwei parallel zueinander verlaufenden vorzugsweise stegartig ausgebildeten Klemmbacken begrenzt sein, von denen eine einer Auswurfrichtung zugewandte Klemmbacke auf den Durchmesser des festzulegenden Stangen­ materials einstellbar ist und derart verschwenkbar ist, daß beim Auswerfen des gebogenen Materials eine Behinderung nicht erfolgt.In an embodiment, the gap can be delimited by two mutually parallel, preferably web-like clamping jaws, one of which has a clamping jaw facing an ejection direction to the diameter of the rods to be fixed materials is adjustable and can be pivoted in such a way that there is no obstruction when the bent material is ejected.

Insbesondere kann der Spalt das Material umfangsseitig vollständig umgeben, wodurch sichergestellt ist, daß das Material beim Biegen und/oder bei einer Positionsveränderung des Spalts nicht herausrutschen kann.In particular, the gap can completely surround the material on the circumference, thereby ensuring that the material cannot slip out during bending and / or when the position of the gap changes.

Durch die diesbezüglichen Maßnahmen ist es nicht mehr erforderlich, daß zwingend ein Biegeschlitten das stangenförmige Material hält, während der andere Biegeschlitten verfahren wird und umgekehrt. Vielmehr können die den Spalt begrenzenden Klemmbacken das Stangenmaterial derart festhalten, daß die Biegeschlitten gleichzeitig verfahrbar sind, ohne daß hierdurch die Biegeformen negativ beeinflußt werden. Durch die mittige Anordnung des Klemmspaltes ist des weiteren gewährleistet, daß diese eine Behinderung für die Biegeschlitten selbst nicht darstellen.The relevant measures mean that it is no longer necessary for one bending slide to hold the rod-shaped material while the other bending slide is being moved and vice versa. Rather, the clamping jaws delimiting the gap can hold the rod material in such a way that the bending slides can be moved at the same time without the bending shapes being adversely affected thereby. The central arrangement of the clamping gap also ensures that they do not constitute a hindrance to the bending slide itself.

Nach einem weiteren hervorzuhebenden Lösungsvorschlag ist vorgesehen, daß das Material vorzugsweise mittels zumindest eines Elements wie Gabel und/oder der den Spalt bildenden Elemente angehoben und über den Biegedorn gehoben wird, so daß das Material in anderer Richtung gebogen werden kann. Gleichzeitig erfolgt die Verstellung des Gegenhalter und der Biegerolle.According to a further proposed solution, it is provided that the material is preferably raised by means of at least one element such as a fork and / or the elements forming the gap and raised above the bending mandrel, so that the material can be bent in another direction. The counterholder and the bending roller are adjusted at the same time.

Weitere Einzelheiten, Vorteile und Merkmale der Erfindung ergeben sich nicht nur aus den Ansprüchen, den diesen zu entnehmenden Merkmalen -für sich und/oder in Kombination-, sondern auch aus der nachfolgenden Beschreibung eines in der Zeichnung dargestellten bevorzugten Ausführungsbeispiels.Further details, advantages and features of the invention result not only from the claims, the features to be extracted from them - individually and / or in combination - but also from the following description of a preferred exemplary embodiment shown in the drawing.

Es zeigen:

  • Fig. 1 eine schematische Darstellung einer Vorrichtung zum Biegen von stangenförmigem Material,
  • Fig. 2 eine Draufsicht auf den in Fig. 1 dargestellten rechten Biegeschlitten,
  • Fig. 3 eine Schnittdarstellung einer Vorrichtung zum Bearbeiten von Stangenmaterial,
  • Fig. 4 eine schematische Darstellung einer Vorrichtung zum Bearbeiten von Stangenmaterial umfassend vorzugsweise die Elemente der Fig. 1 und 3,
  • Fig. 5 eine Klemmeinrichtung für zu biegendes stangenförmiges Material und
  • Fig. 6 beispielhaft einen Biegeablauf.
Show it:
  • 1 is a schematic representation of a device for bending rod-shaped material,
  • 2 is a plan view of the right bending slide shown in FIG. 1,
  • 3 shows a sectional illustration of a device for processing bar material,
  • 4 shows a schematic representation of a device for processing bar material, preferably comprising the elements of FIGS. 1 and 3,
  • Fig. 5 shows a clamping device for rod-shaped material to be bent and
  • Fig. 6 shows an example of a bending process.

In Fig. 1 ist in rein schematischer Darstellung eine Vorrichtung (10) zum Biegen von stabförmigem Material (12) dargestellt. Dabei kann die Vorrichtung (10) vom Prinzip her einen Aufbau aufweisen, wie z.B. ihn die Europäischen Patentanmeldungen 0 121 896 oder 0 238 026 zeigen. Die Vorrichtung (10) umfaßt folglich zwei vorzugsweise verfahrbare Biegeschlitten (14) und (16), die jeweils einen Biegedorn (18) bzw. (20) und eine um diesen als Mittelpunkt verschwenkbare Biegekurbel oder Biegerolle (22) bzw. (24) aufweisen.In Fig. 1, a device (10) for bending rod-shaped material (12) is shown in a purely schematic representation. In principle, the device (10) can have a structure, such as European patent applications 0 121 896 or 0 238 026 show it. The device (10) consequently comprises two preferably displaceable bending slides (14) and (16), each of which has a bending mandrel (18) or (20) and a bending crank or bending roller (22) or (24) which can be pivoted about the center thereof .

Erfindungsgemäß weist jeder Biegeschlitten (14), (16) zusätzliche im wesentlichen senkrecht zu dem zwischen den Biegeschlitten (14) und (16) verlaufenden Material (12) Gegenhalter (26) und (28) auf, die stufenlos verstellbar sind. Im Ausführungsbeispiel werden die Gegenhalter (26) und (28) mittels Spindeln (30) und (32) so auf die Biegedorne (18) und (20) ausgerichtet, daß beim Biegen des stabförmigen Materials ein Durchbiegen des zwischen den Biegedornen (18) und (20) verlaufenden Materials unter­bleibt. Dabei braucht selbstverständlich nur derjenige Gegenhalter des Biegeschlittens mit dem stabförmigen Material (12) wechselwirken, auf dem das Material gebogen wird.According to the invention, each bending slide (14), (16) has additional brackets (26) and (28) which are essentially perpendicular to the material (12) running between the bending slides (14) and (16) and are continuously adjustable. In the exemplary embodiment, the counterholders (26) and (28) are aligned with the bending mandrels (18) and (20) by means of spindles (30) and (32) so that when Bending of the rod-shaped material prevents the material running between the bending mandrels (18) and (20) from bending. Of course, only that counter-holder of the bending slide needs to interact with the rod-shaped material (12) on which the material is bent.

Das stabförmige Material wird entsprechend der Zeichnung nach Fig. 1 auf sogenannte Biegetische (34) bzw. (36) gelegt, wobei darauf zu achten ist, daß bei gleichzeitigem Biegen mehrerer Materialien (12) diese übereinander angeordnet sind. Dies wird durch die den Fig. 3 bis 5 zu entnehmenden Merkmale sichergestellt.The rod-shaped material is placed on so-called bending tables (34) or (36) in accordance with the drawing according to FIG. 1, it being important to ensure that when several materials (12) are bent at the same time, they are arranged one above the other. This is ensured by the features shown in FIGS. 3 to 5.

In Fig. 2 ist in Draufsicht der Biegeschlitten (14) mit Biegetisch (34), Biegedorn (18) und Biegerolle bzw. -kurbel (22) dargestellt. Ferner erkannt man den Gegenhalter (26), der mittels der Spindel (30) stufenlos verstellbar ist. Dabei kann die Verstellbarkeit des Gegenhalters (26) vorzugsweise programmge­steuert in Abhängigkeit von dem Durchmesser des zu biegenden Materials (12), dem Durchmesser des Biegedorns (18) sowie dem Durchmesser der Biegerolle (22) eingestellt werden. Hierdurch bedingt ist sodann gewährleistet, daß die gebogenen Formen innerhalb der zulässigen Toleranzen übereinstimmen.2 shows a top view of the bending slide (14) with a bending table (34), bending mandrel (18) and bending roller or crank (22). Furthermore, the counter-holder (26) can be seen, which is infinitely adjustable by means of the spindle (30). The adjustability of the counter-holder (26) can preferably be set in a program-controlled manner as a function of the diameter of the material (12) to be bent, the diameter of the bending mandrel (18) and the diameter of the bending roller (22). This then ensures that the curved shapes match within the permissible tolerances.

Durch die stufenlose Verstellbarkeit des Gegenhalters (26), der z. B. in eine unterhalb der Oberfläche des Tischs (34) von der Spindel bewegten Halterung aufgenommen wird, ist mit konstruktiv einfachen Mitteln gewährleistet, daß ein Ausrichten zu beiden Seiten des stabförmigen Materials (12) möglich ist, also in Abhängigkeit davon, in welcher Richtung das Material gebogen wird. So wird in Fig. 2 in der durchgezogenen Darstellung das Material (12) entgegen dem Uhrzeigersinn gebogen, wohingegen die gestrichelte Darstellung einen Biegevorgang im Uhrzeigersinn andeuten soll. In diesem Fall befindet sich der Gegenhalter (26) in der gestrichelten Position (38), um von dieser Seite ein unkontrolliertes Durchbiegen des Materials (12) zu verhindern.Due to the stepless adjustability of the counter holder (26), the z. B. in a below the surface of the table (34) moved by the spindle holder is ensured with structurally simple means that an alignment to both sides of the rod-shaped material (12) is possible, so depending on the direction the material is bent. In the solid representation in FIG. 2, the material (12) is bent counterclockwise, whereas the dashed representation is intended to indicate a clockwise bending process. In this case the counter-holder (26) is in the dashed position (38) to prevent uncontrolled bending of the material (12) from this side.

In Fig. 2 ist des weiteren rein schematisch ein Element (31) eingezeichnet, mit dem das stabförmige Material (12) angehoben werden kann, um auf der gegenüberliegenden Seite des Biegedorns (18) abgesetzt zu werden. Hierdurch wird die Möglichkeit eröffnet, mit konstruktiv einfachen Mitteln das Material (12) wahlweise im oder entgegengesetzt dem Uhrzeiger­sinn zu biegen. Bei dem Element (31) kann es sich um gabelförmige Elemente handeln, die mittels Hydraulikzylinder anhebbar, parallel zur Spindel (30) verschiebbar und sodann wieder absenkbar sind bzw. umgekehrt. Die Elemente (31) können dabei in die Ebene unterhalb der Biegeschlitten (14) und (16) abgesenkt werden, um deren Bewegung nicht zu behindern. Auch kann ein synchrones Verschieben zusammen mit den Biegeschlitten (14) und (16) erfolgen. Alternativ besteht auch die Möglichkeit, die Elemente (31) im Bereich der insbesondere der Fig. 5 zu entnehmenden Klemmeinrichtung anzuordnen.An element (31) with which the rod-shaped material (12) can be raised in order to be deposited on the opposite side of the bending mandrel (18) is furthermore drawn purely schematically. This opens up the possibility of bending the material (12) either clockwise or counterclockwise using structurally simple means. The element (31) can be fork-shaped elements that can be raised by means of hydraulic cylinders, displaced parallel to the spindle (30) and then lowered again or vice versa. The elements (31) can be lowered into the plane below the bending slide (14) and (16) in order not to hinder their movement. Synchronous displacement can also take place together with the bending slides (14) and (16). Alternatively, there is also the possibility of arranging the elements (31) in the area of the clamping device, which can be seen in particular in FIG. 5.

Den Ausführungsbeispielen der Fig. 3 bis 5 ist eine hervorzu­hebende Ausgestaltung einer Vorrichtung zum Biegen von stabförmigem Material zu entnehmen, das bevorzugterweise zwei verfahrbare Biegeschlitten entsprechend denen der Fig. 1 aufweist. In Fig. 4 sind diese Biegeschlitten (14) und (16) in ihren äußeren Endpositionen dargestellt. Das mit dem Bezugs­zeichen (40) bezeichnete stabförmige Material wird von einem Materiallager (42) über eine rampenförmig ausgebildete Schräge (44) einem Spalt (46) zugeführt, dessen Breite in Abhängigkeit von dem Durchmesser des stabförmigen Materials (40) einstellbar ist. Hierdurch wird gewährleistet, daß die gleichzeitig zu biegenden Materialien (40) übereinander in dem Spalt (46) vorliegen, also auch übereinander zwischen nicht dargestellter Biegerolle und Biegedorn zu liegen kommen. Hierdurch ist sichergestellt, daß die zu biegenden Materialien sämtlichst die gleiche Endform erhalten.The exemplary embodiments in FIGS. 3 to 5 show an embodiment of a device for bending rod-shaped material that preferably has two movable bending slides corresponding to those in FIG. 1. 4, these bending carriages (14) and (16) are shown in their outer end positions. The rod-shaped material designated by the reference symbol (40) is fed from a material store (42) via a ramp-shaped slope (44) to a gap (46), the width of which can be adjusted depending on the diameter of the rod-shaped material (40). This ensures that the materials (40) which are to be bent at the same time are present one above the other in the gap (46), that is to say also one above the other between those which are not shown Bending roll and mandrel come to rest. This ensures that the materials to be bent all receive the same final shape.

Der Spalt (46) wird dabei im Ausführungsbeispiel von einer einen vertikal verlaufenden Endabschnitt der rampenförmig ausgebildeten Schräge (44) und von einem verstell- und verschwenkbaren Backenelement (50) begrenzt.In the exemplary embodiment, the gap (46) is delimited by a vertically extending end section of the ramp-shaped slope (44) and by an adjustable and pivotable jaw element (50).

Durch das Festklemmen des stangenförmigen Materials innerhalb des Spaltes (50) ist des weiteren der Vorteil gegeben, daß die Biegeschlitten (14) und (16) gleichzeitig verschoben werden können, ohne daß die Gefahr besteht, daß das stangenförmige Material unkontrolliert verrutscht. Seitlich von dem Spalt (50) und demzufolge auch von der rampenförmigen Schräge (44) sind um eine Achse (52) Arme (54) und (56) verschwenkbar ausgebildet, um durch Verschwenken der Arme (54) und (56) das gebogene Material einer Ablage (58) zuzuführen.By clamping the rod-shaped material within the gap (50) there is also the advantage that the bending slide (14) and (16) can be moved simultaneously without the risk that the rod-shaped material slips in an uncontrolled manner. Arms (54) and (56) can be pivoted about an axis (52) laterally from the gap (50) and consequently also from the ramp-shaped slope (44), so that the bent material can be pivoted by pivoting the arms (54) and (56) to feed a tray (58).

Der Fig. 5 ist eine besonders hervorzuhebende Ausgestaltung der Erfindung zu entnehmen. Dargestellt ist eine Klemmeinrichtung (60), mittels der die stabförmigen Materialien (12) vorzugsweise mittig zwischen den nicht dargestellten Biegeschlitten geführt festgeklemmt werden. Die Klemmeinrichtung umfaßt Backen (62) und (64), die im zusammengefahrenen Zustand die stabförmigen Materialien (12) umfangsseitig umgeben. Hierzu weist die Backe (62) eine in Richtung der Backe (64) vorspringende Nase (66) auf, die den zwischen den Backen (62) und (64) gebildeten Spalt (68) kopfseitig verschließt, also die stabförmigen Materialien (12) oberseitig abdeckt. Dabei ist die Backe (62) in bezug auf die Backe (64) verschiebbar ausgebildet. Die Nase (66) ragt dabei teilweise in eine entsprechend angepaßte Aussparung der Backe (64) hinein, um auch bei größeren Spalten (68) zu gewährleisten, daß diese vollständig von der Nase (66) abdeckbar sind. Die Backe (62) ist zu der Backe (64) verschiebbar ausgebildet, um so eine gewünschte Spaltbreite einzustellen. Ferner ist die aus den Backen (62) und (64) bestehende Einheit zum einen senkrecht zur Längsachse der Stabmaterialien, also entlang der Pfeile (70) verschiebbar und zum anderen anhebbar bzw. absenkbar. Diese Bewegung wird beispielhaft mittels des Zylinders (72) hervorgerufen. Dabei ist das Anheben und Absenken bzw. das Verschieben entlang des Pfeils (70) dann erforderlich, wenn entsprechend der Darstellung gemäß Fig. 2 das stabförmige Material (32) in bezug auf den Biegdorn (18) umgelegt werden soll, also bei einer Positionsver­änderung von der durchgezogenen Darstellung in die gestrichelte und umgekehrt. Die verschiedenen Positionen sind gleichfalls in Fig. 5 angedeutet.5 shows a particularly noteworthy embodiment of the invention. A clamping device (60) is shown, by means of which the rod-shaped materials (12) are preferably clamped in the middle between the bending slides, not shown. The clamping device comprises jaws (62) and (64) which surround the rod-shaped materials (12) on the circumference in the retracted state. For this purpose, the jaw (62) has a nose (66) projecting in the direction of the jaw (64), which closes the gap (68) formed between the jaws (62) and (64) on the head side, that is to say the rod-shaped materials (12) on the top covers. The jaw (62) is designed to be displaceable with respect to the jaw (64). The nose (66) partially protrudes into a correspondingly adapted recess in the jaw (64) in order to ensure that even with larger gaps (68) they can be completely covered by the nose (66). The jaw (62) is designed to be displaceable relative to the jaw (64) so as to achieve a desired gap width adjust. Furthermore, the unit consisting of the jaws (62) and (64) can be moved on the one hand perpendicular to the longitudinal axis of the rod materials, that is along the arrows (70), and on the other hand can be raised or lowered. This movement is caused, for example, by means of the cylinder (72). Lifting and lowering or shifting along the arrow (70) is necessary if, as shown in FIG. 2, the rod-shaped material (32) is to be folded over with respect to the bending mandrel (18), i.e. when the position changes from the solid representation in the dashed and vice versa. The various positions are also indicated in FIG. 5.

Das Anheben bzw. Absenken des Materials (12) erfolgt dabei synchron mit der Bewegung der gabelförmigen Elemente (31), so daß sichergestellt ist, daß das stabförmige Material im erforderlichen Umfang umgelegt wird.The raising or lowering of the material (12) takes place synchronously with the movement of the fork-shaped elements (31), so that it is ensured that the rod-shaped material is folded over to the required extent.

Ein diesbezüglicher Verfahrensablauf, also eine Links/Rechts­biegung, um z.B. eine Z-Form zu erzielen, ist beispielhaft der Fig. 6 zu entnehmen.A procedure in this regard, i.e. a left / right bend to e.g. To achieve a Z shape can be seen, for example, in FIG. 6.

In Fig. 6 a) ist das ungebogene stabförmige Material (12) dargestellt. Um eine Biegung im Uhrzeigersinn vorzunehmen, wird die Biegerolle (22) um den Biegedorn (18) gebogen. (Fig. 6 b)). Sodann wird die Biegerolle zurückgefahren und der die Biegerolle (22) und den Biegedorn (18) aufweisende Schlitten zu der Position des stabförmigen Materials verschoben, in der eine Biegung entgegen dem Uhrzeigersinn vorgenommen werden soll. Sodann wird senkrecht zur Zeichenebene das stabförmige Material mittels der Klemmeinrichtung (60) bzw. der gabelförmigen Elemente (31) angehoben. Gleichzeitig wird die Biegerolle (22) in Richtung des Pfeiles (74) verschwenkt. Auch wird der Gegen­halter (38) entlang der Bahn (30) bewegt, wie durch den Pfeil (76) angedeutet ist. Außerdem wird das Material (12) entlang des Pfeils (78) verschoben und sodann abgesenkt. Diese Position ist in Fig. 6 d) dargestellt. Sodann wird die Biegerolle (22) entgegen dem Uhrzeigersinn um den Biegedorn (18) gedreht, um das Material entgegengesetzt zu biegen, um also die in Fig. 6 e) dargestellte Z-Form zu gewinnen.In Fig. 6 a) the unbent rod-shaped material (12) is shown. To make a clockwise bend, the bending roller (22) is bent around the mandrel (18). (Fig. 6 b)). The bending roller is then retracted and the slide having the bending roller (22) and the bending mandrel (18) is moved to the position of the rod-shaped material in which a bend is to be made counterclockwise. The rod-shaped material is then raised perpendicular to the plane of the drawing by means of the clamping device (60) or the fork-shaped elements (31). At the same time, the bending roller (22) is pivoted in the direction of the arrow (74). The counter-holder (38) is also moved along the path (30), as indicated by the arrow (76). In addition, the material (12) is moved along the arrow (78) and then lowered. This position is shown in Fig. 6 d). The bending roller (22) is then rotated counterclockwise around the bending mandrel (18) in order to bend the material in the opposite direction, so that the Z shape shown in FIG. 6 e) is obtained.

Claims (9)

1. Vorrichtung (10) zum Bearbeiten von Stangenmaterial (12, 40) wie Bewehrungsstählen umfassend zumindest einen entlang des Stangenmaterials verschiebbaren Biegeschlitten (14, 16) mit Biegedorn (18, 20) und um diesen drehbare Biegerolle (22, 24) sowie einen vorzugsweise im wesentlichen senkrecht zur Stangenmateriallängsachse ortsveränderbaren Gegenhalter (26, 28),
dadurch gekennzeichnet,
daß der Gegenhalter (26, 28) ausschließlich im wesentlichen senkrecht zu der Stangenmateriallängsachse und stufenlos verstellbar ausgebildet ist.1. Device (10) for processing bar material (12, 40) such as reinforcing steel comprising at least one bending slide (14, 16) which can be displaced along the bar material and has a bending mandrel (18, 20) and a bending roller (22, 24) which can be rotated about said bar, and preferably one counterholder (26, 28) which can be changed in position essentially perpendicular to the longitudinal axis of the rod material,
characterized,
that the counter-holder (26, 28) is designed exclusively substantially perpendicular to the longitudinal axis of the rod material and continuously adjustable. 2. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Gegenhalter (26, 28) mit einem elektromotorischen oder mechanischen Antrieb, vorzugsweise mittels einer Spindel (30, 32) zum Festlegen in der gewünschten Position angetrieben ist.2. Device according to claim 1,
characterized,
that the counter-holder (26, 28) is driven by an electromotive or mechanical drive, preferably by means of a spindle (30, 32) for fixing in the desired position. 3. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Gegenhalter (26, 28) automatisch in Abhängigkeit von dem Durchmesser des zu biegenden Stangenmaterials (12) und dem Durchmesser von dem Biegedorn (18, 20) und/oder der Biegerolle (22, 24) einstellbar ist.3. Device according to claim 1,
characterized,
that the counter-holder (26, 28) is automatically adjustable depending on the diameter of the bar material (12) to be bent and the diameter of the bending mandrel (18, 20) and / or the bending roller (22, 24). 4. Vorrichtung nach insbesondere Anspruch 1 mit zwei Biegeschlitten (14, 16), von denen zumindest einer verschieb­bar ausgebildet ist,
dadurch gekennzeichnet,
daß die Vorliegen der Biegeschlitten (14, 16) in ihren äußeren Endstellungen in etwa mittig zwischen den Biegeschlitten ein das Stangenmaterial (12, 40) klemmend aufnehmender Spalt (46, 48) vorhanden ist.4. The device according to claim 1 in particular with two bending carriages (14, 16), of which at least one is designed to be displaceable,
characterized,
that the presence of the bending slides (14, 16) in their outer end positions approximately in the middle between the bending slides there is a gap (46, 48) which clamps the rod material (12, 40). 5. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
daß der Spalt (46) von zwei parallel zueinander verlaufenden Klemmbacken (48, 50) begrenzt ist, von denen eine vorzugsweise eine vertikal verlaufende Begrenzungsfläche einer rampenförmig ausgebildeten Schräge (44) ist, über die das Material (40) von einer Vorlage (42) der Biegevor­richtung zuführbar ist.5. The device according to claim 4,
characterized,
that the gap (46) is delimited by two mutually parallel clamping jaws (48, 50), one of which is preferably a vertically running delimiting surface of a ramp-shaped slope (44), over which the material (40) from a template (42) the bending device can be fed. 6. Vorrichtung nach zumindest Anspruch 5,
dadurch gekennzeichnet,
daß die einer Auswurfrichtung zugewandte Klemmbacke (50) auf den Durchmesser des festzulegenden Stangenmaterials (40) einstellbar und vorzugsweise senkrecht zu der Stangen­materiallängsachse verschwenkbar ist.6. The device according to at least claim 5,
characterized,
that the clamping jaw (50) facing an ejection direction can be adjusted to the diameter of the rod material (40) to be fixed and can preferably be pivoted perpendicularly to the longitudinal axis of the rod material. 7. Vorrichtung nach zumindest einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die den Spalt (68) begrenzenden Backen (62, 64) zum Umsetzen des Materials (12) von einer Seite des Biegedorns (18, 20) auf die gegenüberliegende Seite als Einheit verschiebbar und/oder anhebbar bzw. absenkbar ausgebildet sind.7. The device according to at least one of the preceding claims,
characterized,
that the jaws (62, 64) delimiting the gap (68) for moving the material (12) from one side of the bending mandrel (18, 20) to the opposite side can be displaced and / or raised or lowered as a unit. 8. Vorrichtung nach zumindest einem vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Klemmbacken (62, 64) zum umfangsseitigen Umfassen des Materials (12) im Kopfbereich bereichsweise überlappend ausgebildet sind.8. The device according to at least one of the preceding claims,
characterized,
that the clamping jaws (62, 64) are designed to overlap in regions in the head region for encircling the material (12). 9. Vorrichtung nach zumindest einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß das Material (12) zum Umsetzen von einer Seite des Biededorns (18, 20) auf die gegenüberliegende Seite mittels vorzugsweise gabelförmig ausgebildeter Elemente (31) verschiebbar und/oder anheb- bzw. absenkbar ist.9. The device according to at least one of the preceding claims,
characterized,
that the material (12) for moving from one side of the mandrel (18, 20) to the opposite side can be displaced and / or raised or lowered by means of preferably fork-shaped elements (31).
EP89112119A 1988-07-05 1989-07-03 Apparatus for working rod material Expired - Lifetime EP0349953B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3822713A DE3822713A1 (en) 1988-07-05 1988-07-05 DEVICE FOR MACHINING ROD MATERIAL
DE3822713 1988-07-05

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EP0349953A2 true EP0349953A2 (en) 1990-01-10
EP0349953A3 EP0349953A3 (en) 1990-11-14
EP0349953B1 EP0349953B1 (en) 1993-10-06

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5113683A (en) * 1990-01-26 1992-05-19 Eaton Leonard Picot S.A. Pipe bending machine having two bending heads
EP0592798A1 (en) * 1992-09-15 1994-04-20 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Method to carry out bends and relative devices
US5927132A (en) * 1998-04-30 1999-07-27 Schnell Spa Method of bending bars
US6813922B2 (en) * 2000-04-03 2004-11-09 Numalliance Bending machine for rods with resettable folding shank
US7124486B2 (en) 2000-10-31 2006-10-24 Macsoft. S.A. Fast and automated tool-changing device with standard conical tool support for digitally controlled bending machine
CN102441594A (en) * 2012-01-06 2012-05-09 中山市奥美森工业技术有限公司 Bending machine
CN106077338A (en) * 2016-07-27 2016-11-09 珠海市英利特机电工程有限公司 A kind of full-automatic double roller bending systems
CN106077183A (en) * 2016-07-27 2016-11-09 珠海市英利特机电工程有限公司 A kind of double roller bending mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031463A1 (en) * 1990-10-05 1992-04-09 Heinz Ruhl Mobile bending of uncoiled wire or strip

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CH348031A (en) * 1955-12-21 1960-07-31 Ghiringhelli Enrico Apparatus for bending iron bars for reinforced concrete and the like
DE1139351B (en) * 1960-04-30 1962-11-08 Krupp Dolberg G M B H Reinforcing steel bending machine
GB2128913A (en) * 1982-10-05 1984-05-10 Shimizu Construction Co Ltd Apparatus for automatically bending reinforcement bars
FR2615131A1 (en) * 1987-05-11 1988-11-18 Oscam Spa MACHINE FOR FOLDING ROUND OR OTHER SIMILAR METAL ELEMENTS

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Publication number Priority date Publication date Assignee Title
CH348031A (en) * 1955-12-21 1960-07-31 Ghiringhelli Enrico Apparatus for bending iron bars for reinforced concrete and the like
DE1139351B (en) * 1960-04-30 1962-11-08 Krupp Dolberg G M B H Reinforcing steel bending machine
GB2128913A (en) * 1982-10-05 1984-05-10 Shimizu Construction Co Ltd Apparatus for automatically bending reinforcement bars
FR2615131A1 (en) * 1987-05-11 1988-11-18 Oscam Spa MACHINE FOR FOLDING ROUND OR OTHER SIMILAR METAL ELEMENTS

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5113683A (en) * 1990-01-26 1992-05-19 Eaton Leonard Picot S.A. Pipe bending machine having two bending heads
EP0592798A1 (en) * 1992-09-15 1994-04-20 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Method to carry out bends and relative devices
US5375447A (en) * 1992-09-15 1994-12-27 M.E.P. Macchine Elettroniche Piegatrici Spa Method to carry out bends and relative device
US5927132A (en) * 1998-04-30 1999-07-27 Schnell Spa Method of bending bars
US6813922B2 (en) * 2000-04-03 2004-11-09 Numalliance Bending machine for rods with resettable folding shank
US7124486B2 (en) 2000-10-31 2006-10-24 Macsoft. S.A. Fast and automated tool-changing device with standard conical tool support for digitally controlled bending machine
CN102441594A (en) * 2012-01-06 2012-05-09 中山市奥美森工业技术有限公司 Bending machine
CN102441594B (en) * 2012-01-06 2013-09-25 中山市奥美森工业技术有限公司 Bending machine
CN106077338A (en) * 2016-07-27 2016-11-09 珠海市英利特机电工程有限公司 A kind of full-automatic double roller bending systems
CN106077183A (en) * 2016-07-27 2016-11-09 珠海市英利特机电工程有限公司 A kind of double roller bending mechanism

Also Published As

Publication number Publication date
DE3822713A1 (en) 1990-01-18
DE58905813D1 (en) 1993-11-11
EP0349953B1 (en) 1993-10-06
EP0349953A3 (en) 1990-11-14

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