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EP0256245B1 - Tool holder for a folding machine or the like - Google Patents

Tool holder for a folding machine or the like Download PDF

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Publication number
EP0256245B1
EP0256245B1 EP87108596A EP87108596A EP0256245B1 EP 0256245 B1 EP0256245 B1 EP 0256245B1 EP 87108596 A EP87108596 A EP 87108596A EP 87108596 A EP87108596 A EP 87108596A EP 0256245 B1 EP0256245 B1 EP 0256245B1
Authority
EP
European Patent Office
Prior art keywords
tool
piece
groove
holding element
tool holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87108596A
Other languages
German (de)
French (fr)
Other versions
EP0256245A2 (en
EP0256245A3 (en
Inventor
Heinz Fetsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eisen- und Hammerwerk GmbH
Original Assignee
Eisen- und Hammerwerk GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eisen- und Hammerwerk GmbH filed Critical Eisen- und Hammerwerk GmbH
Priority to AT87108596T priority Critical patent/ATE55929T1/en
Publication of EP0256245A2 publication Critical patent/EP0256245A2/en
Publication of EP0256245A3 publication Critical patent/EP0256245A3/en
Application granted granted Critical
Publication of EP0256245B1 publication Critical patent/EP0256245B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B21D5/0236—Tool clamping

Definitions

  • the invention relates to a tool holder according to the preamble of patent claim 1.
  • Such a tool holder is already known from DE-A-31 36 440.
  • a working cylinder acts on a rocker, which has the contact point for the tool at its end opposite the cylinder on the rocker bearing.
  • a spring-loaded locking pin is also provided, which is pressed into a lateral groove of the tool by the pressure of the spring and causes mechanical locking of the tool even when the cylinder is depressurized. This spring-loaded pin is pulled back to release the tool.
  • the clamping or pressing device In order to be able to integrate this safety pin into the tool holder, the clamping or pressing device must be designed as a rocker, which is complex and requires a relatively large amount of space. In addition, the jaw of the pressure device or the rocker must be pulled back to release the pin.
  • the solution to this task consists essentially in that the holding element or the like - for mechanically securing the tool piece - on the tool or tool piece on the opposite side of the pressure piece and thus the pressing device and is arranged independently of this.
  • the pressing device can be designed to be much simpler and act directly on the tool piece, so it does not have to be a relatively large rocker.
  • the holding element used for mechanical security can namely be actuated completely independently of the pressure piece of the pressing device, because it acts on the opposite side of the tool.
  • this holding element can also be designed and constructed much better for its securing task and for simple and quick operability.
  • the holding element has a traction pin or the like which extends transversely to the tool piece and its groove, which is preferably arranged laterally, and in its longitudinal extension is preferably retractable against the force of a spring.
  • This pull pin can be freely accessible independently of a rocker or the like spanning it, which allows further design options for simplified operation.
  • the holding element can be a last piece which can be withdrawn against at least two parallel springs parallel to itself by means of the pull pin against the force of the springs from the area of the groove or the like. Recess of the tool piece and whose width is equal to or less than the width of the groove of the tool piece.
  • a rotary handle or the like engages on the holding element on its pull pin, which acts upon a bevel or the like leading away from the tool piece during its rotation, the height of this bevel at least the disengagement path of the Holding element corresponds.
  • the user only needs to turn a twist grip to unlock the mechanical lock, whereby this is lifted from its original position due to the inclined surface and lifts the strip piece out of the groove against the force of the springs via the pull pin.
  • Such a rotary movement on a sufficiently large rotary handle is much easier to carry out than when a spring-loaded pin has to be pulled. In any case, it is avoided that the actual pressing device or its pressure piece for lifting the pin itself has to be withdrawn and moved away from the tool holder.
  • At least one inclined surface is provided as a border for a groove-like groove for receiving a projection or the like projecting on the side of the rotary handle facing the tool piece, this projection being arranged in the holding position in this groove and by turning the handle Can be moved over the inclined surface and the edge of the groove and can thus be moved away from the tool piece together with the twist grip and the pulling pin or the like, so that the holding element is disengaged from its groove.
  • the protrusion (s) on the underside of the rotary handle facing the tool piece are rotatably mounted rolling elements, preferably balls, which can be mounted in a recess or the like of the rotary handle, which can hold the ball or the like.
  • Rolling bodies preferably comprises at least about half. This reduces the friction and thus the force to be exerted when the rotary handle is actuated, in particular to disengage the mechanical lock.
  • a particularly advantageous and inexpensive embodiment of the invention for the operation and the power distribution can consist in the fact that the twist grip has a ball or the like on each side of the traction pin emanating from it, both balls or the like in the holding position of the holding element in the continuous channel, and that the channel is delimited and formed by two preferably symmetrical inclined surfaces.
  • the twist grip moves the two balls over the inclined surfaces that rise away from each other over the edge region of the groove, whereby the twist grip is simultaneously raised from its original position and the pull pin with the holding element is thus withdrawn.
  • the turning handle is a rod-shaped gripping piece extended in the direction of the ball receptacles and all turning handles in the holding position are coincident, preferably aligned with one another with their longitudinal extent and running parallel to the locking groove and the groove in the tool. As a result, it can be immediately recognized from the outside whether all the rotary handles are in the safety position or in the release position.
  • the surfaces arranged diagonally in opposite directions to limit the locking groove enclose an obtuse angle in cross section.
  • the pull pin can be rotatably mounted on the rotary handle and / or the holding element in order to make the relative rotation of the rotary handle as smooth as possible with respect to the strip-shaped holding element.
  • a tool holder designated as a whole by 1, is used for the detachable fastening of a tool, preferably consisting of a plurality of pieces aligned with one another, for a die bending press.
  • a tool piece 2 can be seen, which can be fixed in the tool holder 1 by means of a pneumatic or hydraulic pressure device, generally designated 3, via a pressure piece 4.
  • the pressure piece 4 is acted upon by a piston 5, the cylinder chamber 6 of which has a corresponding supply line 7 for the pressure medium. It becomes clear that it is sufficient to depressurize the cylinder space 6 in order to eliminate the force emanating from the pressure piece 4 and to be able to replace the tool piece 2.
  • the tool piece 2 is mechanically secured in its position of use by at least one holding element 9 which engages in a groove 8 of the tool or of the tool piece 2. This mechanical lock must therefore be released when changing tools.
  • Fig. 1 it can be seen that the holding element 9 on the tool or the tool piece 2 on the opposite side of the pressure piece 4 and thus facing away from the pressing device 3 and is arranged independently of this.
  • the pressing device 3 can function practically without a path or with very little play, that is to say that no large strokes of the piston 5 are required.
  • the holding element 9 has a traction pin 11 which extends transversely to the tool piece 2 and its laterally arranged groove 8 and is retractable in its longitudinal extension against the force of a spring 10.
  • the holding element 9 is a last piece which can be withdrawn from the area of the groove 8 of the tool piece 2 against two parallel springs 10 parallel to itself by means of the pull pin 11.
  • the width of this holding element 9 is approximately equal to the width of the groove 8 of the tool piece 2, so it fills it practically completely according to FIG. 1.
  • a twist grip 12 which, when it is rotated from the position shown in solid lines in FIG. 1 into the dash-dotted position, that is to say preferably by 90 °, leads away from the tool piece 2, in the following applied to be described in more detail, wherein the height difference overcome by this slope corresponds at least to the disengagement of the holding element 9.
  • the bevel is an inclined surface 13 and thereby a groove-like groove 14 for receiving a side 15 of the rotary handle facing the tool piece 2 12 projecting projection 16 is provided.
  • the projection 16 is arranged according to FIGS. 1 and 2 in the holding position in this channel 14. By turning the rotary handle 12, the projection 16 is now moved over the inclined surface 13 and the groove edge 17 and thereby moved away from the tool piece 2 together with the rotary handle 12 and the pull pin 11.
  • the inclined surfaces 13 and the groove-shaped groove 14 on the machine abutment part 18 for the tool piece 2 to be clamped are arranged on the side thereof facing away from the tool piece 2.
  • the protrusions 16 projecting on the underside 15 of the rotary handle 12 facing the tool piece 2 are balls which are rotatably mounted within the rotary handle 12 in the exemplary embodiment, but which could also be other rolling elements in order to increase the resistance to rotation, especially when the holding element 9 is disengaged reduce. These balls are mounted in a recess 19 of the twist grip 12, this recess 19 according to FIG. 2 comprising at least about half of a ball 16.
  • a plurality of holding elements 9, each with a twist grip 12 can be provided side by side.
  • the twist grip 12 is a rod-shaped gripping piece extended in the direction of the ball receptacles, and according to FIG. 2, all twist grips 12 in the holding position are coincident, aligned with one another and parallel to the locking groove 14 and the groove 8 in the tool 2. 3 clearly shows that the securing position of the holding elements 9 is immediately recognizable from the outside. If one of the twist grips 12 were twisted and thus the holding element 9 belonging to it was not in the securing position, this twist grip 12 would be at right angles to the practice.
  • Fig. 1 it can still be seen that the oppositely inclined surface 13 for limiting the locking groove 14 enclose an obtuse angle in cross section in order to achieve a relatively uniform and gradual lifting of the holding elements 9 when turning the rotary handle and when tensioning the springs 10 , but at the same time to have a good locking position in the securing position shown in FIG. 2.
  • the pull pin 11 is rotatably and axially immovably mounted in a recess 21 of the holding element 9 by means of a collar 20 in order to enable the turning of the turning handle relative to the holding element 9 in a simple manner and thereby also to exert the desired pulling force via the pull pin 11 to allow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Jigs For Machine Tools (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)

Abstract

1. A tool holder (1) for the releasable fastening of a tool or tool pieces (2) in alignment with one another for a folding machine, the tool or tool pieces (2) in the tool holder (1) being adapted to be tightened, particularly pneumatically or hydraulically, through a pressure mechanism (3) by means of a thrust piece (4) and to be mechanically secured by at least one holding element (9) engaging in a groove (8) of the tool or tool piece (2), characterized in that the holding element (9) is arranged at the tool or tool piece (2) on the side opposite the thrust piece (4) hence so as to be averted from and independent of the pressure mechanism (3) and that the holding element (9) has a tension pin (11) which runs at right angles to the tool or tool piece (2) and to the laterally arranged groove (8) of said tool or tool piece and is retractable in its longitudinal expanse against the force of a spring (10).

Description

Die Erfindung betrifft einen Werkzeughalter nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a tool holder according to the preamble of patent claim 1.

Aus der DE-A-31 36 440 ist ein derartiger Werkzeughalter bereits bekannt. Dabei wirkt ein Arbeitszylinder auf eine Wippe, die an ihrem dem Zylinder an dem Wippenlager gegenüberliegenden Ende die Anpreßstelle für das Werkzeug hat. In diesem Angriffsbereich der Anpreßvorrichtung ist außerdem ein federbelasteter Sicherungsstift vorgesehen, der durch den Druck der Feder in eine seitliche Nut des Werkzeuges gedrückt wird und eine mechanische Sicherung des Werkzeuges auch bei drucklosem Zylinder bewirkt. Zum lösen des Werkzeuges wird dieser federbelastete Stift zurückgezogen.Such a tool holder is already known from DE-A-31 36 440. A working cylinder acts on a rocker, which has the contact point for the tool at its end opposite the cylinder on the rocker bearing. In this area of engagement of the pressing device, a spring-loaded locking pin is also provided, which is pressed into a lateral groove of the tool by the pressure of the spring and causes mechanical locking of the tool even when the cylinder is depressurized. This spring-loaded pin is pulled back to release the tool.

Um diesen Sicherheitsstift in den Werkzeughalter integrieren zu können, muß die Klemm- oder Anpreßvorrichtung als Wippe ausgebildet sein, was aufwendig ist und relativ Platz benötigt. Darüber hinaus muß zum Lösen des Stiftes unbedingt auch die Klemmbacke der Anpreßvorrichtung bzw. der Wippe zurückgezogen werden.In order to be able to integrate this safety pin into the tool holder, the clamping or pressing device must be designed as a rocker, which is complex and requires a relatively large amount of space. In addition, the jaw of the pressure device or the rocker must be pulled back to release the pin.

Es besteht deshalb die Aufgabe, eine Werkzeughalter der eingangs erwähnten Art zu schaffen, bei welchem die Anpreßvorrichtung und ihr Druckstück einfacher und direkt auf die Klemmstelle des Werkzeugstückes wirkend ausgebildet sein kann und die Bedienung beim Herauslösen oder Neueinsetzen eines Werkzeugstückes vereinfacht ist.It is therefore the task of creating a tool holder of the type mentioned in the introduction, in which the pressing device and its pressure piece can be designed to be simpler and act directly on the clamping point of the tool piece and the operation when removing or reinserting a tool piece is simplified.

Die Lösung dieser Aufabe besteht im wesentlichen darin, daß das Halteelement od. dgl.-zum mechanischen Sichern des Werkzeugstückes-an dem Werkzeug oder Werkzeugstück auf der dem Druckstück gegenüberliegenden Seite und somit der Anpreßvorrichtung abgewandt und unabhängig von dieser angeordnet ist.The solution to this task consists essentially in that the holding element or the like - for mechanically securing the tool piece - on the tool or tool piece on the opposite side of the pressure piece and thus the pressing device and is arranged independently of this.

Dadurch kann die Anpreßvorrichtung wesentlich einfacher und unmittelbar auf das Werkzeugstück wirkend ausgebildet sein, muß also keine relativ groß bauende Wippe sein. Das zur mechanischen Sicherung dienende Halteelement kann nämlich völlig unabhängig von dem Druckstück der Apreßvorrichtung betätigt werden, weil es die gegenüberliegende Seite des Werkzeuges beaufschlagt. Dadurch kann auch dieses Halteelement wesentlich besser auf seine Sicherungsaufgabe hin und auf möglichst einfache und schnelle Bedienbarkeit ausgerichtet und konstruiert sein.As a result, the pressing device can be designed to be much simpler and act directly on the tool piece, so it does not have to be a relatively large rocker. The holding element used for mechanical security can namely be actuated completely independently of the pressure piece of the pressing device, because it acts on the opposite side of the tool. As a result, this holding element can also be designed and constructed much better for its securing task and for simple and quick operability.

Zweckmäßig ist es z.B., wenn das Halteelement eine quer zu dem Werkzeugstück und dessen vorzugsweise seitlich angeordnet Nut verlaufenden und in seiner Längserstreckung vorzugsweise gegen die Kraft einer Feder rückziehbaren Zugstift od. dgl. aufweist. Dabei kann dieser Zugstift unabhängig von einer ihn übergreifenden Wippe od. dgl. frei zugänglich sein, was weitere Ausgestaltungsmöglichkeiten für eine vereinfachte Bedienung erlaubt.It is expedient, for example, if the holding element has a traction pin or the like which extends transversely to the tool piece and its groove, which is preferably arranged laterally, and in its longitudinal extension is preferably retractable against the force of a spring. This pull pin can be freely accessible independently of a rocker or the like spanning it, which allows further design options for simplified operation.

Das Halteelement kann ein Leistenstück sein, welches gegen wenigstens zwei parallele Federn parallel zu sich selbst mittels des Zugstiftes gegen die Kraft der Federn aus dem Bereich der Nut od. dgl. Ausnehmung des Werkzeugstückes rückziehbar ist und dessen Breite gleich oder kleiner als die Breite der Nut des Werkzeugstückes ist. Somit ist die Sicherung des Werkzeuges oder des Werkzeugstückes nicht nur von der relativ gering dimensionierten Spitze des Stiftes abhängig, sondern es wird eine verbesserte Sicherheit durch ein Leistenstück erreicht.The holding element can be a last piece which can be withdrawn against at least two parallel springs parallel to itself by means of the pull pin against the force of the springs from the area of the groove or the like. Recess of the tool piece and whose width is equal to or less than the width of the groove of the tool piece. Thus the securing of the tool or the tool piece is not only dependent on the relatively small dimensioned tip of the pin, but an improved safety is achieved by a strip piece.

Für die schon erwähnte verbesserte Bedienbarkeit ist es zweckmäßig, wenn an dem Halteelement an dessen Zugstift ein Drehgriff od. dgl. angreift, der bei seiner Verdrehung eine von dem Werkzeugstück wegführende Schräge od. dgl. beaufschlagt, wobei die Höhe dieser Schräge wenigstens dem Ausrückweg des Halteelementes entspricht. Somit braucht der Benutzer zur Entiegelung der mechanischen Sicherung nur einen Drehgriff zu verdrehen, wodurch dieser aufgrund der Schrägfläche aus seiner ursprünglichen Lage angehoben wird und über den Zugstift das Leistenstück aus der Nut gegen die Kraft der Federn aushebt. Eine solche Drehbewegung an einem ausreichend groß bemessenen Drehgriff ist wesentlich einfacher durchführbar, als wenn an einem federbelasteten Stift gezogen werden muß. In jedem Falle wird vermieden, daß die eigentliche Anpreßvorrichtung oder deren Druckstück zum Ausheben des Stiftes ihrerseits zurückgezogen und von dem Werkzeughalter weg bewegt werden muß.For the above-mentioned improved operability, it is expedient if a rotary handle or the like engages on the holding element on its pull pin, which acts upon a bevel or the like leading away from the tool piece during its rotation, the height of this bevel at least the disengagement path of the Holding element corresponds. Thus, the user only needs to turn a twist grip to unlock the mechanical lock, whereby this is lifted from its original position due to the inclined surface and lifts the strip piece out of the groove against the force of the springs via the pull pin. Such a rotary movement on a sufficiently large rotary handle is much easier to carry out than when a spring-loaded pin has to be pulled. In any case, it is avoided that the actual pressing device or its pressure piece for lifting the pin itself has to be withdrawn and moved away from the tool holder.

Besonders zweckmäßig ist es dabei, wenn wenigstens eine Schrägfläche als Bregrenzung einer nutenartigen Rinne zur Aufnahme eines auf der dem Werkzeugstück zugewandten Seite des Drehgriffes vorspringenden Vorsprunges od. dgl. vorgesehen ist, wobei dieser Vorsprung in Halteposition in dieser Rinne angeordnet ist und durch Verdrehen des Griffes über die Schrägfläche und den Nutenrand bewegbar und dadurch zusammen mit dem Drehgriff und dem Zugstift od. dgl. von dem Werkzeugstück wegbewegbar ist, so daß das Halteelement aus dessen Nut ausgerückt wird.It is particularly expedient if at least one inclined surface is provided as a border for a groove-like groove for receiving a projection or the like projecting on the side of the rotary handle facing the tool piece, this projection being arranged in the holding position in this groove and by turning the handle Can be moved over the inclined surface and the edge of the groove and can thus be moved away from the tool piece together with the twist grip and the pulling pin or the like, so that the holding element is disengaged from its groove.

Dabei ist es besonders vorteilhaft, wenn der oder die an der dem Werkzeugstück zugewandten Unterseite des Drehgriffes vorstehenden Vorsprünge innerhalb des Drehgriffes drehbar gelagerte Wälzkörper, vorzugsweise Kugeln sind, die in einer Ausnehmung od. dgl. des Drehgriffes gelagert sein können, welche die Kugel od. dlg. Wälzkörper vorzugsweise wenigstens etwa zur Hälfte etwa umfaßt. Dies vermindert bei der Betätigung des Drehgriffes insbesondere zum Ausrücken der mechanischen Sperre die Reibung und somit die aufzuwendende Kraft.It is particularly advantageous if the protrusion (s) on the underside of the rotary handle facing the tool piece are rotatably mounted rolling elements, preferably balls, which can be mounted in a recess or the like of the rotary handle, which can hold the ball or the like. dlg. Rolling bodies preferably comprises at least about half. This reduces the friction and thus the force to be exerted when the rotary handle is actuated, in particular to disengage the mechanical lock.

Eine für die Bedienung und die Kraftverteilung besonders vorteilhafte und günstige Ausführungsform der Erfindung kann dabei darin bestehen, daß der Drehgriff beidseits des von ihm ausgehenden Zugstiftes je eine Kugel od. dgl. aufweist, wobei beide Kugeln od. dgl. in Halteposition des Halteelementes in der duchgehenden Rinne liegen, und daß die Rinne durch zwei vorzugsweise symmetrische Schrägflächen begrenzt und gebildet ist. Beim Verdrehen des Drehgriffes werden so die beiden Kugeln über die voneinanderweg ansteigenden Schrägflächen über den Randbereich der Nut bewegt, wodurch gleichzeitig der Drehgriff von seiner ursprünglichen Lage aus angehoben und somit der Zugstift mit dem Halteelement zurückgezogen wird.A particularly advantageous and inexpensive embodiment of the invention for the operation and the power distribution can consist in the fact that the twist grip has a ball or the like on each side of the traction pin emanating from it, both balls or the like in the holding position of the holding element in the continuous channel, and that the channel is delimited and formed by two preferably symmetrical inclined surfaces. When twisting the The twist grip moves the two balls over the inclined surfaces that rise away from each other over the edge region of the groove, whereby the twist grip is simultaneously raised from its original position and the pull pin with the holding element is thus withdrawn.

Dabei können für jedes Werkzeugstück mehrere Halteelemente mit jeweils einem Drehgriff nebeneinander vorgesehen sein, wodurch die Sicherheit durch erhöht wird, daß nicht unbeabsichtigt eine Sicherung in Offenstellung bleiben kann.In this case, several holding elements, each with a rotary handle, can be provided next to one another for each tool piece, which increases the security by the fact that a safety device cannot remain in the open position unintentionally.

Die Sicherheit kann dadurch weiter erhöht werden, daß der Drehgriff ein in Richtung der Kugelaufnahmen ausgedehntes stabförmiges Greifstück ist und alle Drehgriffe in Halteposition übereinstimmend, vorzugsweise mit ihrer Längserstreckung miteinander fluchtend und parallel zu der Rastnut sowie der Nut im Werkzeug verlaufend ausgebildet sind. Dadurch läßt sich schon von außen der sofort erkennen, ob alle Drehgriffe in Sicherheitsposition oder in Lösestellung sind.Security can be further increased by the fact that the turning handle is a rod-shaped gripping piece extended in the direction of the ball receptacles and all turning handles in the holding position are coincident, preferably aligned with one another with their longitudinal extent and running parallel to the locking groove and the groove in the tool. As a result, it can be immediately recognized from the outside whether all the rotary handles are in the safety position or in the release position.

Um das Entriegeln zu erleichtern, ist es vorteilhaft, wenn die gegensinnig schräg angeordneten Flächen zur Begrenzung der Rastnut im Querschnitt einen stumpfen Winkel miteinander einschließen. Ferner kann der Zugstift an dem Drehgriff und/oder dem Halteelement drehbar gelagert sein, um die Relativverdrehung des Drehgriffes gegenüber dem leistenförmigen Halteelement möglichst leichtgängig zu gestalten.In order to facilitate unlocking, it is advantageous if the surfaces arranged diagonally in opposite directions to limit the locking groove enclose an obtuse angle in cross section. Furthermore, the pull pin can be rotatably mounted on the rotary handle and / or the holding element in order to make the relative rotation of the rotary handle as smooth as possible with respect to the strip-shaped holding element.

Insbesondere bei Kombination der vorbeschriebenen Merkmale und Maßnahmen ergibt sich eine Werkzeughalterung, bei welcher die hydraulische oder pneumatisch Anpressung einfach und platzsparend konstruiert sein kann, weil sie keine Rücksicht auf die zusätzliche mechanische Sicherung nehmen muß. Somit ergibt sich ein geringer baulicher Aufwand mit wenigen verschleißbehafteten Teilen. Da gleichzeitig eine flache Gestaltung der Anpreßvorrichtung möglich ist, ergibt sich auch nur eine sehr geringe Beeinträchtigung durch diese Anpreßvorrichtung bei den Abkantarbeiten. Die Bedienung ist einfach und kann unabhängig von den verschiedenen Spanneinrichtungen erfolgen, wobei sich gleichzeitig in vorteilhafter Weise auch eine optische Kontrolle für die Offen- oder Schließstellung insbesondere der mechanischen Sicherheitseinrichtungen ergibt. Nachstehend ist die Erfindung anhand der Zeichnung noch näher beschrieben.A combination of the features and measures described above results in a tool holder in which the hydraulic or pneumatic pressure can be constructed in a simple and space-saving manner because it does not have to take into account the additional mechanical securing. This results in a low construction effort with few parts subject to wear. Since at the same time a flat design of the pressing device is possible, there is only a very slight impairment caused by this pressing device during the bending work. Operation is simple and can be carried out independently of the various tensioning devices, with an optical control for the open or closed position, in particular of the mechanical safety devices, also advantageously resulting at the same time. The invention is described in more detail below with reference to the drawing.

Es zeigt in zum Teil schematisierter Darstellung:

  • Fig. 1 einen Querschnitt durch einen Werkzeughalter mit einem Werkzeugstück in Gebrauchsstellung, wobei dieses durch eine Apreßvorrichtung festgelegt und gleichzeitig mechanisch gesichert ist,
  • Fig. 2 einen quer zu der Schnittebene der Fig. 1 verlaufenden Schnitt durch die mechanische Sicherung des Werkzeugstückes und
  • Fig. 3 in verkleinertem Maßstab die Außenansicht der Seite des Werkzeughalters. Auf welcher die Betätigungsgriffe für die mechanischen Sicherungen der Werkzeugstücke angeordnet sind.
It shows in a partially schematic representation:
  • 1 shows a cross section through a tool holder with a tool piece in the use position, said tool holder being fixed by a pressing device and being mechanically secured at the same time,
  • Fig. 2 is a transverse to the section plane of Fig. 1 section through the mechanical securing of the tool piece and
  • Fig. 3 in a reduced scale the external view of the side of the tool holder. On which the operating handles for the mechanical securing of the tool pieces are arranged.

Ein im ganzen mit 1 bezeichneter Werkzeughalter dient zum lösbaren Befestigen eines vorzugsweise aus mehreren miteinander fluchtenden Stücken bestehenden Werkzeuges für eine Gesenkbiegepresse. In Fig. 1 ist der eingespannte Bereich eines solchen Werkzeugstückes 2 erkennbar, welches in dem Werkzeughalter 1 durch eine im ganzen mit 3 bezeichnete pneumatische oder hydraulische Anpreßvorrichtung über ein Druckstück 4 festlegbar ist. Das Druckstück 4 wird dabei von einem Kolben 5 beaufschlagt, dessen Zylinderraum 6 eine entsprechende Zuleitung 7 für das Druckmedium hat. Es wird dadurch deutlich, daß es genügt, den Zylinderraum 6 drucklos zu machen, um die von dem Druckstück 4 ausgehende Kraft zu beseitigen und das Werkzeugstück 2 auswechseln zu können.A tool holder, designated as a whole by 1, is used for the detachable fastening of a tool, preferably consisting of a plurality of pieces aligned with one another, for a die bending press. In Fig. 1, the clamped area of such a tool piece 2 can be seen, which can be fixed in the tool holder 1 by means of a pneumatic or hydraulic pressure device, generally designated 3, via a pressure piece 4. The pressure piece 4 is acted upon by a piston 5, the cylinder chamber 6 of which has a corresponding supply line 7 for the pressure medium. It becomes clear that it is sufficient to depressurize the cylinder space 6 in order to eliminate the force emanating from the pressure piece 4 and to be able to replace the tool piece 2.

Zusätzlich ist das Werkzeugstück 2 jedoch durch wenigstens ein in eine Nut 8 des Werkzeuges bzw. des Werkzeugstückes 2 eingreifendes Halteelement 9 mechanisch in seiner Gebrauchsstellung gesichert. Für den Werkzeugwechsel muß deshalb diese mechanische Sicherung gelöst werden.In addition, however, the tool piece 2 is mechanically secured in its position of use by at least one holding element 9 which engages in a groove 8 of the tool or of the tool piece 2. This mechanical lock must therefore be released when changing tools.

In Fig. 1 erkennt man, daß das Halteelement 9 an dem Werkzeug bzw. dem Werkzeugstück 2 auf der dem Druckstück 4 gegenüberliegenden Seite und somit der Anpreßvorrichtung 3 abgewandt und unabhängig von dieser angeordnet ist. Dadurch wird der schon erwähnte Vorteil ermöglicht, daß die Anpreßvorrichtung 3 praktisch weglos bzw. mit ganz geringem Spiel funktionieren kann, also keine großen Hübe des Kolbens 5 erforderlich sind. Außerdem ergibt sich so eine platzsparende Ausbildung der Anpreßvorrichtung 3, da in ihr nicht die mechanische Sicherung des Werkzeugstückes 2 integriert werden muß.In Fig. 1 it can be seen that the holding element 9 on the tool or the tool piece 2 on the opposite side of the pressure piece 4 and thus facing away from the pressing device 3 and is arranged independently of this. This enables the already mentioned advantage that the pressing device 3 can function practically without a path or with very little play, that is to say that no large strokes of the piston 5 are required. In addition, this results in a space-saving design of the pressing device 3, since it does not have to integrate the mechanical securing of the tool piece 2.

Die mechanische Sicherung des Werkzeugstükkes 2 ist vor allem bei gemeinsamer Betrachtung der Figuren 1 und 2 gut zu erkennen. Das Halteelement 9 weist dabei einen quer zu dem Werkzeugstück 2 und dessen seitlich angeordneter Nut 8 verlaufenden, in seiner Längserstreckung gegen die Kraft einer Feder 10 rückziehbaren Zugstift 11 auf. Gemäß Fig. 2 ist dabei das Halteelement 9 ein Leistenstück, welches gegen zwei parallele Federn 10 parallel zu sich selbst mittels des Zugstiftes 11 aus dem Bereich der Nut 8 des Werkzeugstückes 2 rückziehbar ist. Dabei ist die Breite diese Halteelementes 9 etwa gleich der Breite der Nut 8 des Werkzeugstückes 2, füllt diese also gemäß Fig. 1 praktisch vollständig aus.The mechanical securing of the tool piece 2 can be seen particularly well when viewing FIGS. 1 and 2 together. The holding element 9 has a traction pin 11 which extends transversely to the tool piece 2 and its laterally arranged groove 8 and is retractable in its longitudinal extension against the force of a spring 10. 2, the holding element 9 is a last piece which can be withdrawn from the area of the groove 8 of the tool piece 2 against two parallel springs 10 parallel to itself by means of the pull pin 11. The width of this holding element 9 is approximately equal to the width of the groove 8 of the tool piece 2, so it fills it practically completely according to FIG. 1.

An dem Halteelement 9 greift über dessen Zugstift 11 ein Drehgriff 12 an, der bei seiner Verdrehung aus der in Fig. 1 mit durchgezogenen Strichen dargestellten Position in die strichpunktierte Lage, also vorzugsweise um 90°, eine von dem Werkzeugstück 2 wegführende, im folgenden noch näher zu beschreibende Schräge beaufschlagt, wobei der von dieser Schräge überwundene Höhenunterschied wenigstens dem Ausrückweg des Halteelementes 9 entspricht.On the holding element 9 engages via its pull pin 11, a twist grip 12 which, when it is rotated from the position shown in solid lines in FIG. 1 into the dash-dotted position, that is to say preferably by 90 °, leads away from the tool piece 2, in the following applied to be described in more detail, wherein the height difference overcome by this slope corresponds at least to the disengagement of the holding element 9.

Gemäß Fig. 1 ist die Schräge als Schrägfläche 13 und dabei als Begrenzung einer nutenartigen Rinne 14 zur Aufnahme eines auf der dem Werkzeugstück 2 zugewandten Seite 15 des Drehgriffes 12 vorspringenden Vorsprunges 16 vorgesehen. Der Vorsprung 16 ist gemäß Fig. 1 und 2 in Halteposition in dieser Rinne 14 angeordnet. Durch Verdrehung des Drehgriffes 12 wird nun der Vorsprung 16 über die Schrägfläche 13 und den Nutenrand 17 bewegt und dadurch zusammen mit dem Drehgriff 12 und dem Zugstift 11 von dem Werkzeugstück 2 wegbewegt. Dabei sind die Schrägflächen 13 und die rinnenförmige Nut 14 an dem Maschinenwiderlagerteil 18 für das einzuklemmende Werkzeugstück 2 auf dessen dem Werkzeugstück 2 abgewandter Seite angeordnet.1, the bevel is an inclined surface 13 and thereby a groove-like groove 14 for receiving a side 15 of the rotary handle facing the tool piece 2 12 projecting projection 16 is provided. The projection 16 is arranged according to FIGS. 1 and 2 in the holding position in this channel 14. By turning the rotary handle 12, the projection 16 is now moved over the inclined surface 13 and the groove edge 17 and thereby moved away from the tool piece 2 together with the rotary handle 12 and the pull pin 11. The inclined surfaces 13 and the groove-shaped groove 14 on the machine abutment part 18 for the tool piece 2 to be clamped are arranged on the side thereof facing away from the tool piece 2.

Der oder die an der dem Werkzeugstück 2 zugewandten Unterseite 15 des Drehgriffes 12 vorstehenden Vorsprünge 16 sind im Ausführungbeispiel innerhalb des Drehgriffes 12 drehbar gelagerte Kugeln, die aber auch andere Wälzkörper sein könnten, um den Widerstand gegen des Verdrehen vor allem beim Ausrücken des Haltelementes 9 zu verringern. Dabei sind diese Kugeln in einer Ausnehmung 19 des Drehgriffes 12 gelagert, wobei diese Ausnehmung 19 gemäß Fig. 2 wenigstens etwa die Hälfte einer Kugel 16 umfaßt.The protrusions 16 projecting on the underside 15 of the rotary handle 12 facing the tool piece 2 are balls which are rotatably mounted within the rotary handle 12 in the exemplary embodiment, but which could also be other rolling elements in order to increase the resistance to rotation, especially when the holding element 9 is disengaged reduce. These balls are mounted in a recess 19 of the twist grip 12, this recess 19 according to FIG. 2 comprising at least about half of a ball 16.

In Fig. 2 wird deutlich, daß der Drehgriff 12 beidseits des von ihm ausgehenden Zugstiftes 11 je eine Kugel 16 od. dgl. Wälzkörper aufweist, wobei beide Kugeln 16 als Vorsprünge in Halteposition des Halteelementes 9 in der durchgehenden Rinne 14 liegen, und daß die Rinne 14 durch zwei symmetrische Schrägflächen 13 begrenzt und gebildet ist. Beim Verdrehen des Drehgriffes 13 wird also je eine Kugel 16 über eine dieser Schrägflächen 13 bewegt und gelangt auf die einander gegenüberliegenden Randbereich der Rinne 14, wie es strichpunktiert in Fig. 1 angedeutet ist.In Fig. 2 it is clear that the twist grip 12 on both sides of the pull pin 11 emanating from it has a ball 16 or the like. Rolling elements, both balls 16 as projections in the holding position of the holding element 9 in the continuous channel 14, and that Channel 14 is delimited and formed by two symmetrical inclined surfaces 13. When turning the rotary handle 13, a ball 16 is moved over one of these inclined surfaces 13 and reaches the opposite edge region of the channel 14, as is indicated by dash-dotted lines in FIG. 1.

In Fig. 3 erkennt man, daß für jedes Werkzeug und ggfs. auch jedes Werkzeugstück mehrere Halteelemente 9 mit jeweils einem Drehgriff 12 nebeneinander vorgesehen sein können. Der Drehgriff 12 ist im Ausführungsbeispiel ein in Richtung der Kugelaufnahmen ausgedehntes stabförmiges Greifstück und gemäß Fig. 2 sind alle Drehgriffe 12 in Halteposition übereinstimmend, miteinander fluchtend und parallel zu der Rastnut 14 sowie der Nut 8 im Werkzeug 2 verlaufend ausgebildet. Man erkennt anhand der Fig. 3 deutlich, daß die Sicherungsstellung der Halteelemente 9 von außen her sofort erkennbar ist. Wäre einer der Drehgriffe 12 verdreht und somit das zu ihm gehörende Halteelement 9 nicht in Sicherungsposition, stünde dieser Drehgriff 12 quer zu den übringen.In Fig. 3 it can be seen that for each tool and possibly also each tool piece, a plurality of holding elements 9, each with a twist grip 12, can be provided side by side. In the exemplary embodiment, the twist grip 12 is a rod-shaped gripping piece extended in the direction of the ball receptacles, and according to FIG. 2, all twist grips 12 in the holding position are coincident, aligned with one another and parallel to the locking groove 14 and the groove 8 in the tool 2. 3 clearly shows that the securing position of the holding elements 9 is immediately recognizable from the outside. If one of the twist grips 12 were twisted and thus the holding element 9 belonging to it was not in the securing position, this twist grip 12 would be at right angles to the practice.

In Fig. 1 erkennt man noch, daß die gegensinnig schräg angeordneten Fläche 13 zur Begrenzung der Rastnut 14 im Querschnitt einem stumpfen Winkel miteinander einschließen, um ein relativ gleichmäßiges und allmähliches Ausheben der Halteelemente 9 beim Verdrehen des Drehgriffes und beim Spannen der Federn 10 zu erreichen, gleichzeitig aber eine gute Rastposition in der in Fig. 2 dargestellten Sicherungsposition zu haben.In Fig. 1 it can still be seen that the oppositely inclined surface 13 for limiting the locking groove 14 enclose an obtuse angle in cross section in order to achieve a relatively uniform and gradual lifting of the holding elements 9 when turning the rotary handle and when tensioning the springs 10 , but at the same time to have a good locking position in the securing position shown in FIG. 2.

Der Zugstift 11 ist im Ausführungsbeispiel mittels eines Bundes 20 in einer Ausnehmung 21 des Halteelementes 9 drehbar und axial unverstellbar gelagert, um das Verdrehen des Drehgriffes relativ zu dem Halteelement 9 auf einfache Weise zu ermöglichen und dabei auch das Ausüben der gewünschten Zugkraft über den Zugstift 11 zu erlauben.In the exemplary embodiment, the pull pin 11 is rotatably and axially immovably mounted in a recess 21 of the holding element 9 by means of a collar 20 in order to enable the turning of the turning handle relative to the holding element 9 in a simple manner and thereby also to exert the desired pulling force via the pull pin 11 to allow.

Claims (11)

1. A tool holder (1) for the releasable fastening of a tool or tool pieces (2) in alignment with one another for a folding machine, the tool or tool pieces (2) in the tool holder (1) being adapted to be tightened, particularly pneumatically or hydraulically, through a pressure mechanism (3) by means of a thrust piece (4) and to be mechanically secured by at least one holding element (9) engaging in a groove (8) of the tool or tool piece (2), characterized in that the holding element (9) is arranged at the tool or tool piece (2) on the side opposite the thrust piece (4) hence so as to be averted from and independent of the pressure mechanism (3) and that the holding element (9) has a tension pin (11) which runs at right angles to the tool or tool piece (2) and to the laterally arranged groove (8) of said tool or tool piece and is retractable in its longitudinal expanse against the force of a spring (10).
2. The tool holder as claimed in Claim 1, characterised in that the holding element (9) is a bar which is retractable parallel to itself against at least two parallel springs (10) from the region of the groove (8) by means of the tension pin (11) and is of the same or lesser width than the groove (8).
3. The tool holder as claimed in Claim 1 or Claim 2 with tool pieces (2) in alignment with one another, characterized in that a turning handle (12) is applied to the tension pin (11) of the holding element (9), and said handle, when twisting, acts upon a slope leading away from the tool piece (2), the height of said slope corresponding at least to the path of disengagement of the holding element (9).
4. The tool holder as claimed in Claim 3, characterized in that at least one angular surface (13) is provided as a boundary of a groove-like channel (14) for receiving a projection (16) protruding on that side (15) of the turning handle (12) which faces the tool piece (2), in the holding position said projection (16) being disposed in said channel (14) and by twisting the handle (12) is movable over the angular surface (13) and the edge (17) of the groove and thereby, together with the turning handle (12) and tension pin (11), is movable away from the tool piece (2).
5. The tool holder as claimed in Claim 4, characterized in that the angular surface (13) and the channel (14) ure disposed on the machine abutment member (18) for the tool piece (2) to be clamped, on that side of said machine abutment member which is averted from the tool piece (2).
6. The tool holder as claimed in Claim 4 or Claim 5, characterized in that the projection(s) (16) protruding at the underside (15) of the turning handle (12) facing the tool piece (2) are rolling elements, preferably balls, rotatably mounted inside the turning handle (12), said rolling elements being mounted in a recess (19) belonging to the turning handle (12) and embracing the rolling elements preferably by at least about half.
7. The tool holder as claimed in Claim 6, characterized in that the turning handle (12) has one ball (16) on either side of the tension pin (11) departing from said handle, in the holding position of the holding element (9) both balls (16) or the like lying in the continuous channel (14), and that the channel (14) is bounded and composed by two preferably symmetrical angular surfaces (13).
8. The tool holder as claimed in any one of Claims 4 to 6, characterized in that a plurality of holding elements (9) with in each case one turning handle (12) are provided side by side for each tool piece (2).
9. The tool holder as claimed in Claim 7 and Claim 8, characterized in that the turning handle (12) is a rod-shaped grip member extended in the direction of the seats of the balls and in the holding position all the turning handles (12) are devised so as to conform, preferably to be in alignment with one another in their longitudinal expanse and to run parallel to the channel (14) serving as the arresting groove and to the groove (8).
10. The tool holder as claimed in any one of Claims 4 to 9, characterized in that the surfaces (13) arranged slantingly in an opposite direction to bound the channel (14) form an obtuse angle in cross section.
11. The tool holder as claimed in any one of Claims 3 to 10, characterized in that the tension pin (11) is rotatably mounted to the turning handle (12) and/or the holding element (9).
EP87108596A 1986-08-12 1987-06-15 Tool holder for a folding machine or the like Expired - Lifetime EP0256245B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108596T ATE55929T1 (en) 1986-08-12 1987-06-15 TOOL HOLDER FOR A PRESS PRESS OR SOMETHING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8621639U 1986-08-12
DE8621639U DE8621639U1 (en) 1986-08-12 1986-08-12 Tool holder in particular for a press brake or the like.

Publications (3)

Publication Number Publication Date
EP0256245A2 EP0256245A2 (en) 1988-02-24
EP0256245A3 EP0256245A3 (en) 1988-05-25
EP0256245B1 true EP0256245B1 (en) 1990-08-29

Family

ID=6797361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108596A Expired - Lifetime EP0256245B1 (en) 1986-08-12 1987-06-15 Tool holder for a folding machine or the like

Country Status (3)

Country Link
EP (1) EP0256245B1 (en)
AT (1) ATE55929T1 (en)
DE (2) DE8621639U1 (en)

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AU3734389A (en) * 1988-05-05 1989-11-29 Donald C. MacGregor Precision press brake
US5067340A (en) * 1988-05-05 1991-11-26 Macgregor Donald C Precision press brake
US5065610A (en) * 1990-03-12 1991-11-19 Kabushiki Kaisha Kosmek Clamping apparatus for press brake
NL9100034A (en) * 1991-01-10 1992-08-03 Wila Maschf Bv PRESS BRAKE TOOL, AND AN ADAPTER AND A BRAKE PRESS FOR IT.
DE19546969A1 (en) * 1995-12-15 1997-06-19 Amada Gmbh Quick clamping device for at least one tool of a processing machine
IT1309745B1 (en) * 1999-04-07 2002-01-30 Toolspress S R L MODULAR ELEMENT TOOL HOLDER EQUIPMENT FOR BENDING PRESSES.
NL1011833C2 (en) * 1999-04-20 2000-10-23 Machf Wila B V Bending press insert, includes adaptor strip and clamping devices for mounting different types of press tools
FR2818189B1 (en) * 2000-12-18 2003-04-04 Amada Europ Sa TOOL HOLDER ASSOCIATED WITH A BENDING PRESS
US6467327B1 (en) 2001-08-15 2002-10-22 Wilson Tool International, Inc. Press brake tool and tool holder
US6928852B2 (en) 2003-03-31 2005-08-16 Wila B.V. Combination of a press brake clamping system and at least a press brake tool
US7004008B2 (en) 2003-07-01 2006-02-28 Wilson Tool International, Inc. Press brake tool having lockable safety key
US7661288B2 (en) 2003-07-01 2010-02-16 Wilson Tool International Inc. Press brake tool safety key assemblies
US7021116B2 (en) 2003-12-19 2006-04-04 Wilson Tool International, Inc. Press brake tooling technology
US7721586B2 (en) 2005-02-08 2010-05-25 Wilson Tool International Inc. Press brake tool seating technology

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AT364589B (en) * 1979-08-01 1981-10-27 Haemmerle Ag CLAMPING DEVICE FOR FASTENING A TOOL TO A TOOL HOLDER
DE3136440A1 (en) * 1981-09-14 1983-03-31 Paul Weinbrenner Maschinenbau GmbH + Co KG, 7252 Weil der Stadt Clamping device for clamping tools
DE3347529A1 (en) * 1983-12-30 1985-07-11 Eisen- Und Hammerwerk Gmbh, 7835 Teningen Tool holder, in particular a tool holder for a die bending press
DE3524694A1 (en) * 1985-07-11 1987-01-22 Hilma Gmbh Maschf Clamping device for top tools in folding presses

Also Published As

Publication number Publication date
ATE55929T1 (en) 1990-09-15
EP0256245A2 (en) 1988-02-24
DE8621639U1 (en) 1986-10-02
EP0256245A3 (en) 1988-05-25
DE3764580D1 (en) 1990-10-04

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