EP2186579A2 - Bending tool and tool holder for a bending machine - Google Patents

Abstract

The tool (1) has an attachment section (5) coupled with a holding section (4) of a tool holder (2). An adjustably mounted contact element (13) e.g. cylindrical contact pin (17), is provided for electrical connection of a functional element (10) with a contact area (14) at the holding section. The contact element is brought to a contact position for contacting the area outwards from a resting position (21) with respect to an outer surface (22) of the attachment section by an actuator (24) e.g. thrust bolt, arranged in the holding section. The resting position is provided at a distance to area. Independent claims are also included for the following: (1) a tool holder for a bending machine (2) a method for electrical coupling of a functional element to a bending tool.

Description

The invention relates to a bending tool according to the preamble of patent claim 1 and a tool holder according to the preamble of claim 15, further a bending machine according to the preamble of claim 19 and a method for electrical coupling of a bending tool with a tool holder according to the preamble of claim 20.

In bending machines, especially press brakes can be used in the tool holders for upper tool or lower tool depending on the workpieces to be bent a variety of tools. For the fully or partially automated production of bent parts, the bending machines are equipped with programmable electronic control devices, which allow the execution of exact and optimized bending operations based on information about the workpiece to be bent and information about the respective bending tools used.

Bending tools are already known for this purpose, which can be identified by the control device on the basis of information transmitted by the bending tool to the control device, or on which measuring elements, in particular electrical measuring sensors are arranged or integrated and thereby measured values, in particular information, during a bending operation can be transmitted to the control device via the bending process or the workpiece to be bent. This transfer takes place in many cases via electrical contacts which form an electrical interface between the bending tool and tool holder, wherein in the inserted state of the bending tools contacts are brought to a mounting portion of a bending tool with contacts on a receiving portion of the tool holder in touching electrical connection, whereby a functional element the bending tool, for example, an information carrier or a measuring element with a control device of the bending machine can be brought into connection. Currents flowing through such an electrical interface between the bending tool and the tool holder can serve both to supply energy to a functional element in the bending tool and to transfer data between the functional element and the control device.

From the prior art it is known to provide the bending tool spring-mounted contact pins which are slightly depressed against the insertion of the bending tool into the tool holder of the contact surfaces of the tool holder against a spring force and are thereby pressed with bias against the contact surfaces, whereby the electrical connection between the functional element in the bending tool and a power supply or a control device of the bending machine can be produced.

A disadvantage of this type of contact is that the contact pins protrude from the bending tool not used in the tool holder and therefore often mechanical stresses can be exposed, which can cause damage to the pins or the contact pin guides and the resilient mounting. Furthermore, when the bending tool is not approached in the direction of the contact pins on the tool holder, grinding operations between the contact pins and the tool holder take place, which cause wear of the contacting surfaces and therefore the electrical connection between the bending tool and tool holder is not ensured in the long run.

The object of the invention is an interface for the electrical connection of a. Functional element to provide a bending tool with a contact surface on a tool holder of a bending machine, which permanently has a high reliability.

The object of the invention is achieved by a bending tool with the features of claim 1, according to which the bending tool comprises a coupling with a receiving portion of the tool holder mounting portion and an adjustably mounted contact element for electrically connecting a formed on the bending tool function element with a contact surface on the receiving portion of the tool holder, and in this case, the contact element can be moved outward by a contact element arranged on the receiving portion of the tool holder from a contact surface spaced rest position relative to an outer surface of the mounting portion in a contact surface contacting the contact position.

The contact element, for example, in the form of a contact pin, is therefore not as in the prior art by a contact surface on the tool holder from a rest position to pressed inside the contact position, but actively spent by a separate actuator on the tool holder from a rest position to the outside in a contact surface contacting contact position.

A cooperating with the bending tool according to the invention inventive tool holder on a bending machine has according to claim 15 a receiving portion for coupling a mounting portion of a bending tool and an electrically conductive, connected to a power supply device or a control device contact surface on the receiving portion, wherein for an adjustment on the attachment portion of the bending tool between a rest position and a contact position adjustably mounted Kontaktlements on the receiving portion of the tool holder is an adjustably mounted, connected to an adjustment and the contact element in the contact position-bringing actuator is arranged.

The actuation of the contact element, so the adjustment of the contact element from the rest position to the contact position is not carried out as in the prior art by means of the inner contour of the receiving portion, in particular by means of the contact surface, but by a separate active drivable actuator in the receiving portion of the tool holder.

A bending machine according to the invention according to claim 19, in particular a press brake with a tool holder and a bending tool which can be coupled thereto, has a tool holder according to the invention and a bending tool cooperating therewith according to the invention.

The object of the invention is further achieved by a method for electrically coupling a functional element on a bending tool with a contact surface on a tool holder by means of a bending tool adjustably mounted contact element, according to the invention in a first step, the bending tool is moved to its intended position on the tool holder and In a subsequent second step, the contact element is adjusted by means of an actuator formed on the tool holder from a distance to the contact surface rest position in a contact surface contacting the contact position. That is at least one contact element as a result, when the bending tool is inserted into the tool holder, it is not subjected to mechanical stresses as in the prior art, but is activated only after reaching the intended position, whereby the insertion or removal of the bending tool on the tool holder does not cause wear on the contact element or on the contact surface ,

Wear on the contact elements during insertion or during removal of the bending tool is particularly avoided when the contact element is flush in the rest position with the outer surface of the mounting portion or set back against this. As a result, mechanical damage to the contact element during handling of the bending tool is largely excluded, since the contact element does not protrude with respect to the outer surface of the bending tool.

The actuator on the tool holder can act directly on the contact element mechanically, but it is also possible that a movement of the actuator is transmitted by means of an adjustable mounting portion on the transfer element mounted on the contact element, for example. A pressure piece or a pivot lever or the like.

Thus, the at least one contact element, if it is not actively spent by the actuator in the contact position, automatically assumes the rest position in which it has a distance to the contact surface of the tool holder or set back relative to the outer surface of the mounting portion, it is advantageous if in Attachment section is arranged on the contact element or the transmission element in the direction of the rest position acting spring element. Characterized the contact element is automatically spent after deactivation of the actuator of the tool holder by the spring element in the protected rest position.

The contact element can thereby be guided approximately rectilinearly in the attachment section, whereby a gentle touching of the contact surface is ensured, in particular if the guide direction is oriented at right angles to the contact surface. Furthermore, a straight-line guide of the contact element may be advantageous if the actuating member and the contact surface are arranged approximately diametrically with respect to the fastening portion located therebetween on the tool holder.

Alternatively, the contact element may be guided by means of a pivot bearing in the attachment portion, such as when the actuator and the contact surface on the tool holder are not diametrically opposed to each other and the adjustment of the actuator to the adjustment of the contact element forms an angle.

Analogously, in the case of a provided between the actuator and the contact element transmission element this also be stirred in a straight line or by means of a pivot bearing in the attachment portion.

The contact element may be designed for reasons of ease of manufacture as a cylindrical contact pin or pin.

Also for reasons of ease of manufacture, the spring element can be designed as a force acting on the contact element or the transmission element, in particular already biased in the rest position compression spring. This embodiment is useful when the contact element is designed as a rectilinear guided, cylindrical contact pin, wherein the compression spring can comprise the contact pin concentrically and is supported on a pinhole, which is mounted on the outer surface of the mounting portion.

The flow of current to or from the functional element takes place in the simplest case on the one hand via the generally metallic bending tool that touches the metallic tool holder and on the other hand via the opposite electrically conductive contact element to the rest of the bending tool, but it can also be provided for the functional element two own, to each other and to provide the bending tool galvanically isolated contact elements. Furthermore, it is possible that a plurality of functional elements are arranged in a bending tool, which is why it may be advantageous if the actuating member acts on at least two contact elements or two transmission elements.

Likewise, the bending tool may also have a transmission element which acts on at least two contact elements. Due to these two Ausrührungsmöglichkeiten despite multiple contact elements can be dispensed with the use of multiple actuators or several transmission elements, resulting in structurally simple solutions.

Since the contact element from the rest of the bending tool or other contact elements must be electrically isolated, this can be stirred in an electrically insulating guide sleeve or the contact element at its passing with the guide sleeve surface portions have an electrically insulating material while the electrically conductive contact surface of the contact element with the Bending tool or the guide sleeve does not come into contact, whereby both the function of the galvanic separation of the contact element or arranged on this electrically conductive contact surface of the bending tool and the mechanical guidance of the contact element is accomplished.

An additional protection of the element during handling outside of the tool holder is achieved when a possibly contacting the contact surface contact portion of the contact element is completely retracted in the rest position in the guide sleeve. The contact section of the contact element which brings about the current transition to the contact surface is thus also largely protected against contamination, as a result of which a low contact resistance at its points of contact between contact element and contact surface is ensured.

The guide sleeve can be formed in particular from a material selected from a group comprising metals and plastics with a low coefficient of sliding friction.

In order to avoid unnecessarily high contact forces between the contact element and contact surface or contact element and transmission element, it is possible that an elastic connecting element is arranged between the contact element and the transmission element. The elastic connecting element can in turn be designed as a spring element, for example, as a compression spring or tension spring made of a metal or else be formed by a connecting element made of elastomeric material.

Alternatively, it can be formed on the contact element itself or on the transmission element itself an elastically deformable portion that makes its own additional connection element dispensable by at least one of the two parts can deform so far that extreme contact forces are avoided when the adjustment of the actuator by a fixed Stop element is limited.

In order to reduce the contact resistance, it is advantageous if the contact element has a hard-gold-plated surface at least in a contact section which possibly makes contact with the contact surface and which is additionally wear-resistant.

As already mentioned above, the functional element can be formed on the bending tool by a measuring element, in particular an electrical measuring transducer, whereby, before, during or after machining and / or reshaping existing properties of the workpiece, such as mechanical variables detected and supplied to the control device of the bending machine can be.

The measuring element can be designed in particular for detecting a geometric size of a workpiece to be machined with the bending tool, for example a bending angle on the workpiece in the loaded and / or unloaded state or, for example, the thickness of the workpiece before the bending deformation.

Furthermore, the functional element can comprise a memory element, in particular for storing tool data, whereby the control device can be transferred either directly from the memory element parameters of the bending tool or after an identification of the bending tool used can be read in a memory stored outside the bending tool tool parameters.

A simple construction of the tool holder can be achieved if the actuating member is formed by a fastening element fixing the fixing portion on the receiving portion. Such clamping elements are available in any case for the fixation of upper tools on the tool holder of an upper press beam anyway and can thereby be used simultaneously as an actuator for the contact element.

The clamping element can be designed in particular as a wedge element, which cooperates with a keyway on the attachment portion of the bending tool. By acting between wedge element and keyway clamping forces can be a very stable and precise fixation of the bending tool on the tool holder and at the same time is one in the keyway arranged on the attachment portion actuator during handling outside the tool holder from damage well protected.

The receiving portion of the tool holder comprises in an advantageous development of the invention, a tool holder groove in which the actuator and the contact surface can be arranged and are thus well protected from damage. The tool receiving groove extends in particular in the longitudinal direction of a press beam or a press table, whereby the position of the bending tool along the press beam or the press table can be chosen freely.

In order in turn to keep the contact resistance at the contact points between the contact element and the contact surface small, the contact surface has, at least in sections, a hard-gold plated surface.

In order to be able to position a bending tool according to the invention at different positions on the tool holder, it is advantageous if the contact surface is formed on a contact rail extending in a longitudinal direction of the receiving portion and arranged in particular in a tool receiving groove. For contacting with different contact elements on one or more bending tools, in particular a plurality of mutually parallel contact rails may be formed.

In order to achieve a galvanic separation between the contact surface and the rest of the tool holder, the contact surface may be formed by at least one conductor track mounted on an electrically insulating carrier element.

The adjusting drive for the adjustment of the actuating member on the tool holder can be formed by a fluidically or electrically operated actuator.

The invention will be explained in more detail below with reference to the exemplary embodiments illustrated in the drawings.

Fig. 1

einen Schnitt durch eine erfindungsgemäße Werkzeugaufnahme mit einem darin nicht vollständig eingesetzten, erfindungsgemäßen Biegewerkzeug mit einem Kontaktelement in Ruhestellung;

Fig. 2

einen Ausschnitt durch die Werkzeugaufnahme gemäß Fig. 1 mit dem vollständig eingesetzten Biegewerkzeug und dem Kontaktelement des Biegewerkzeugs in Kontaktstellung;

Fig. 3

einen Detailausschnitt des Biegewerkzeugs und der Werkzeugaufnahme in der Kontaktstellung des Kontaktelements gemäß Fig. 2;

Fig. 4

eine weitere Ausführungsform einer erfindungsgemäßen Werkzeugaufnahme mit einem darin eingesetzten, jedoch noch nicht fixiertem erfindungsgemäßem Biegewerkzeug mit dem Kontaktelement in Ruhestellung;

Fig. 5

die Werkzeugaufnahme gemäß Fig. 4 mit dem darin fixierten Biegewerkzeug mit dem Kontaktelement in Kontaktstellung;

Fig. 6

eine weitere mögliche Ausführungsform eines erfindungsgemäßen Biegewerkzeugs mit einem schwenkgelagerten Kontaktelement;

Fig. 7

eine weitere Ausführungsform eines erfindungsgemäßen Biegewerkzeugs mit einem schwenkgelagerten Übertragungselement.

Each shows in a simplified schematic representation:

Fig. 1

a section through a tool holder according to the invention with a therein not completely used, bending tool according to the invention with a contact element in the rest position;

Fig. 2

a section through the tool holder according to Fig. 1 with the fully inserted bending tool and the contact element of the bending tool in the contact position;

Fig. 3

a detail of the bending tool and the tool holder in the contact position of the contact element according to Fig. 2 ;

Fig. 4

a further embodiment of a tool holder according to the invention with an inserted therein, but not yet fixed inventive bending tool with the contact element in the rest position;

Fig. 5

the tool holder according to Fig. 4 with the bending tool fixed therein with the contact element in contact position;

Fig. 6

another possible embodiment of a bending tool according to the invention with a pivotally mounted contact element;

Fig. 7

a further embodiment of a bending tool according to the invention with a pivotally mounted transmission element.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the position information selected in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to a new position analogous to the new situation. Furthermore, individual features or combinations of features from the shown and described different Represent examples of their own, inventive or inventive solutions.

All statements on ranges of values in the description of the present invention should be understood to include any and all sub-ranges thereof, e.g. the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10, i. all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.

Fig. 1 shows a bending tool 1 during insertion into a tool holder 2 of a bending machine, not shown, in particular a press brake. The tool holder 2 is arranged on a press bar 3 shown in sections and has a flat receiving portion 4, to which a flat mounting portion 5 of the bending tool 1 can be coupled. In the illustrated embodiment, the receiving portion 4 has a tool receiving groove 6, which is suitable for receiving a fastening extension 7 formed on the bending tool 1 or its attachment portion 5. Its outer contour substantially corresponds to the inner contour of the tool receiving groove 6, wherein between the tool receiving groove 6 and fastening extension 7 a required for the insertion or removal of the bending tool 1 functional game is available. Because of the attachment to a lower side of the press beam 3, the bending tool 1 can also be referred to as an upper tool 8, for example in the form of a bending punch 9, which cooperates with a lower tool (not shown), for example in the form of a press die and for bending forming of workpieces that can be formed. For example, sheet metal blanks, is used.

On the bending tool 1, in the illustrated embodiment in the interior of a functional element 10, for example. In the form of an electrical encoder 11 is arranged, which is connected to the power supply and / or transmission of measurement signals with an electrically conductive, dash-dotted connection line 12. To produce an electrically conductive connection between the functional element 10 and a power supply source or a control device of the bending machine, the connecting line 12 leads to a arranged on the attachment portion 5 contact element 13, which with a contact surface 14 on the receiving portion 4 of the tool holder 2 in Contact can be brought. From this contact surface 14, which is arranged, for example, on the surface of a contact rail 15, which extends in the longitudinal direction of the tool holder groove 6, another also shown in phantom leads connecting line 16 to the power source or control device, not shown.

The contact element 13 is formed in the illustrated embodiment as a cylindrical contact pin 17 whose current-carrying parts are electrically isolated from the rest of the bending tool 1 by means of an electrically insulating guide sleeve 18. The contact element 13 on the attachment portion 5 and the contact surface 14 on the receiving portion 4 are each arranged so that the contact element 13 and contact surface 14 with proper positioning of the bending tool 1 on the tool holder 2 opposite each other directly and in this positioning of the bending tool 1, an electrical connection between the Functional element 10 and the power source or the control device can be produced. In the illustrated embodiment, the contact surface 14 is approximately flush with a side surface of the Werkzeugaufnahmenut 6 and the contact element 13 in the form of the contact pin 17 is approximately at right angles with respect. A center plane 19 of the tool holder groove 6 and the bending tool 1 oriented.

At the in Fig. 1 Right end of the contact element 13 is a spherical cap-shaped contact portion 20 is formed, the surface of which can be brought in the use position of the bending tool 1 with the contact surface 14 into contact. In the illustrated position of the bending tool 1, the contact element 13 is in a rest position 21, in which the contact portion 20 against an outer surface 22 of the attachment portion 5 springs back, so does not project towards the outer contour of the attachment extension 7. In this rest position 21, the contact element 13 is thus protected inside the mounting portion 5 and here the attachment extension 7, whereby in the rest position 21 of the contact element 13 between a functional element 10 and a power source or a control device existing circuit is not closed.

In order to establish a connection between the functional element 10 and the power supply source or the control device, as in Fig. 2 illustrated, the contact element 13 in a contact surface 14 contacting the contact position 23 - in the illustrated embodiment to the right - adjusted. The contact element 13 is for this purpose in the attachment section. 5 or adjustably mounted in the attachment extension 7, as here in the guide sleeve 18, wherein the adjustment from the rest position 21, according to Fig. 1 , in the contact position 23, according to Fig. 2 , By means of a arranged on the receiving portion 4 and on or in this adjustably mounted actuator 24 takes place. The actuator 24, here, for example, in the form of a pressure pin 25, is drivingly connected to an adjusting drive 26, whereby the contact element 13 can be actively adjusted from the rest position 21 into the contact position 23.

Fig. 3 shows in detail again the contact zone between the contact element 13 and the contact surface 14. In the dashed line rest position 21 of the contact element 13 whose contact portion 20 has a distance 27 to the fixed contact surface 14, whereby in the rest position 21 between a functional element 10 and power supply source or control device trained circuit is not closed.

Starting from this position, in which the bending tool 1 is already in its intended position on the tool holder 2, but the contact element 13 is still in rest position 21, the contact element 13 is moved in the adjustment direction 28 to the right by means of the actuator 24 on the receiving portion 4, whereby the contact section 20 contacts the contact surface 14 and the circuit between the functional element 10 and the power supply source or control device is closed at least at the interface between the bending tool 1 and the tool holder 2. While only one contact element 13 is shown in the figures, of course, several contact elements 13, 13 ', ... can be brought into electrical connection with one or more contact surfaces 14, 14', ... at the same time.

So that the contact element 13 assumes the rest position 21 automatically, as soon as the operation is canceled by the actuator 24, a force acting on the contact element 13 in the direction of the rest position 21 spring element 29 is provided that between the adjustable contact element 13 and the fixed mounting portion 5 is effective. As in the Fig. 1 to 3 illustrated, the spring element 29 may be formed as a contact pin 17 concentrically comprising compression spring 30.

As Fig. 3 Furthermore, the contact surface 14 can be formed approximately by a conductor 32 arranged on a carrier element 31. The carrier element 31 and the conductor track 32 are thus part of the contact rail 15 and the contact surface 14 or the conductor track 32 are galvanically separated from the remaining tool holder 3 either by the carrier element 31 itself or an insulating layer arranged between the carrier element 31 and the tool holder 2.

4 and FIG. 5 show in sectional view a further embodiment of a bending tool 1 according to the invention, used in a tool holder 2 of a press beam 3 of a bending machine, not shown, in particular press brake. The contact element 13, which is connected via a dash-dotted connection line 12 to a functional element 10 in the bending tool 1, is located in FIG Fig. 4 at rest 21 and thereby has a distance 27 (see Fig. 3 ) to the contact surface 14, whereby the connection between the functional element 10 and a power source or control device is interrupted on the bending machine. The actuator 24 for adjusting the contact element 13 from the rest position 21 into the contact position 23 in this embodiment by a clamping element 34, with which the attachment portion 5 of the bending tool 1 is fixed to the receiving portion 4 of the tool holder 2. Such clamping elements 34 are part of the tool clamping for upper tools or lower tools on bending machines, especially press brakes and can be simultaneously used in a bending tool 1 according to the invention to move the contact element 13 from the rest position 21 in the contact position 23. The clamping element 34 in this case has a wedge element 35, which is oriented approximately to the right in the illustrated embodiment and can cooperate with a keyway 36 on the attachment extension 7 of the attachment portion 5 and thereby causes the clamping of the bending tool 1 in the tool holder 2. In this embodiment, the actuating member 24 in the form of the clamping member 34 does not act directly on the contact element 13, but is on activation of the clamping member 34, so in a movement to the right, in the attachment extension 7 of the mounting portion 5 approximately horizontally adjustable mounted transmission element 37 here in the form a pressure bolt 38 is displaced together with a guide plate 39 to the right, whereby the contact element 13 connected to the guide plate 39 is also displaced to the right in the contact position 23 (see Fig. 5 ).

The rest position of the contact element 13 with not activated clamping element 34 is effected in this embodiment by acting on the transmission element 37 to the left in the direction of the rest position 21 spring element 40 here in the form of a compression spring 41. The spring element 40 from 4 and FIG. 5 thus corresponds to the effect of the spring element 29 according to the Fig. 1 to 3 ,

By using the guide plate 39, the pressure pin 38 and the contact element 13 to each other have a center distance 42, which even with small dimensions of the attachment extension 7 of the pressure pin 38 and the contact element 13 must not have extremely small dimensions and still have reasonably manageable dimensions. The guide plate 39 is oriented approximately at right angles to the mutually parallel adjustment of pressure pin 38 and contact element 13. The pressure pin 38 is cylindrical and guided approximately horizontally in a bore 43 in the attachment extension 7. In addition, the contact pin 38 is guided at its right, tapered end in a cover member 44 which closes the required for the pressure pin 38, the guide plate 39 and the contact element 13 movement spaces in the inner attachment extension 7 after assembly and further with an inserted in the cover member 44 electrically insulating guide sleeve 18, the contact element 13 additionally leads. To limit the contact force between the contact portion 20 of the contact element 13 and the contact surface 14, the contact element 13 is divided into a firmly connected to the guide plate 39 sleeve member 45 and a coaxially guided therein pin member 46, wherein the axial force between the sleeve member 45 and pin member 46 by a in the sleeve part 45 arranged compression spring 47 is transmitted.

The method for contacting the contact element 13 with the contact surface 14 thus proceeds in the following steps:

First, the bending tool 1 is brought with the contact element 13 in the rest position to its intended position on the tool holder 2, in this embodiment, the attachment extension 7 inserted into the Werkzeugaufnahmenut 6 until laterally adjoining the attachment extension 7 shoulder surfaces 48 on the side of the tool holder groove 6 subsequent contact surfaces 49 completely or at least approximately. This position can be achieved by means of a latching element formed on the fastening extension 7 50, which engages in a latching recess 51 in the tool holder groove 6, are secured, whereby even with not yet activated clamping device falling out of the bending tool 1 from the tool holder 2 is prevented.

When the bending tool 1 is in this insertion position, the tool clamping can be activated, whereby the clamping element 34, which simultaneously forms the actuator 24, is displaced to the right by means of an adjusting drive, whereby the wedge member 35 on the clamping element 34 in the keyway 36 on the attachment extension. 7 engages and thereby the bending tool 1 is pressed against the contact surfaces 49 of the tool holder 3. At the same time, the pressure pin 38 positioned in the keyway 36 is shifted to the right, whereby the guide plate 39 connected thereto and the sleeve part 45 of the contact element 13 attached thereto are also displaced to the right. This movement is transmitted via the compression spring 47 and the pin member 46 of the contact element 13 until it touches the contact surface 14 with its contact portion 20 and thereby the electrical connection between the connecting lines 12 and the connecting line 16 is made. The existing in the rest position of the contact element 13 distance to the contact surface 14 is thus raised by active adjustment of the contact element 13 by means of the actuator 24, here in the form of the clamping element 34.

Fig. 6 shows a further embodiment of a bending tool 1 according to the invention with the contact element 13 in rest position 21 in the intended position in the tool holder 2 used, but without activation of the contact by the actuator 24. The actuator 24 and contact element 13 arranged between transmission element 37 is in this embodiment by a Swivel lever 51 is formed, which is adjustably mounted by means of a pivot bearing 52 on the attachment portion 5, here the attachment extension 7 and the adjustment of the actuator 24 transmits to the contact element 13, whereby this starting from the illustrated rest position 21 in a contact surface 14 contacting, not shown here Contact position is spent and thereby again an electrical connection between the leading to the functional element 10 connecting line 12 and the power supply source or control device leading connection line 16 is produced. In this embodiment, the approximately horizontal adjusting movement of the actuating member 24 is converted by means of the pivot lever 51 in an approximately vertical adjustment movement of the contact element 13, which is why This embodiment is particularly suitable when the actuator 24 and the contact surface 14 are not diametrically opposed to the receiving portion 4 of the tool holder 2. The rest position 21 of the contact element 13 with not activated actuator 24 is effected in this embodiment by acting on the transmission element 37 spring element 40, here in the form of a compression spring 41.

Fig. 7 shows a further embodiment of a bending tool according to the invention 1 used in a tool holder 2 according to the invention, in which the actuator 24 in the Werkzeugaufnahmenut 6 is approximately vertically downwards and transmit its movement by means of a pivot lever 51 on the approximately horizontal in the attachment extension 7 adjustably mounted contact element 13 becomes. Between the transmission element 37 in the form of the pivot lever 51 and the contact element 13, an elastic connecting element 53 is arranged, whereby again the contact forces occurring between the contact portion 20 of the contact element 13 and the contact surface 14 can be limited. The rest position 21 of the contact element with not activated actuator 24 is characterized by a in Fig. 7 shown in dashed lines, acting on the transmission element 37 spring element 40, here in the form of a compression spring 41, causes.

The adjusting drive 26 can be formed in this and in the other embodiments by, in particular by an electrically or fluidly driven actuator.

The embodiments show possible embodiments of the bending tool according to the invention or the tool holder according to the invention, it being noted at this point that the invention is not limited to the specifically illustrated embodiments of this, but also various combinations of the individual embodiments are mutually possible and this variation possibility due to Teaching for technical action by objective invention in the skill of those working in this technical field is the expert. So are all conceivable embodiments, which are possible by combinations of individual details of the illustrated and described embodiment variant, includes the scope of protection.

For the sake of order, it should finally be pointed out that, for a better understanding of the construction of the bending tool or of the tool holder, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.

The task underlying the independent inventive solutions can be taken from the description.

Above all, the individual in the Fig. 1, 2, 3 ; 4, 5 ; 6; 7 shown embodiments form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.

REFERENCE NUMBERS

1

bending tool

2

tool holder

3

pressing bars

4

receiving portion

5

attachment section

6

Werkzeugaufnahmenut

7

Attachment projection

8th

upper tool

9

press die

10

functional element

11

Transducers

12

connecting line

13

contact element

14

contact area

15

contact bar

16

connecting line

17

pin

18

guide sleeve

19

midplane

20

Contact section

21

rest position

22

outer surface

23

contact position

24

actuator

25

pushpin

26

adjustment

27

distance

28

adjustment

29

spring element

30

compression spring

31

support element

32

conductor path

33

insulation layer

34

clamping element

35

key member

36

keyway

37

transmission element

38

pushpin

39

guide plate

40

spring element

41

compression spring

42

Wheelbase

43

drilling

44

cover element

45

sleeve part

46

pin element

47

compression spring

48

shoulder surface

49

contact surface

50

locking element

51

pivoting lever

52

pivot bearing

53

connecting element

Claims (20)

Bending tool (1) for attachment to a tool holder (2) of a bending machine, in particular a press brake, comprising a with a receiving portion (4) of the tool holder (2) coupled mounting portion (5) and an adjustably mounted contact element (13) for electrically connecting a Bending tool (1) formed functional element (10) having a contact surface (14) on the receiving portion (4) of the tool holder (2), characterized in that the contact element (13) by a in the receiving portion (4) of the tool holder (2) arranged actuator ( 24) from a contact surface (14) spaced rest position (21) relative to an outer surface (22) of the mounting portion (5) to the outside in a contact surface (14) contacting the contact position (23) can be brought. Bending tool (1) according to claim 1, characterized in that the contact element (13) in the rest position (21) with the outer surface (22) of the fastening portion (5) is arranged flush or set back against this. Bending tool (1) according to claim 1 or 2, characterized in that a movement of the actuating member (24) by means of a fastening portion (5) adjustably mounted transmission element (37) is transmitted to the contact element (13). Bending tool (1) according to one of claims 1 to 3, characterized in that in the fastening portion (5) on the contact element (13) or the transmission element (37) in the direction of the rest position (21) acting spring element (29, 40) is arranged , Bending tool (1) according to one of claims 1 to 4, characterized in that the contact element (13) is guided approximately rectilinearly in the fastening section (5). Bending tool (1) according to one of claims 1 to 4, characterized in that the contact element (13) by means of a pivot bearing (52) in the mounting portion (5) is guided. Bending tool (1) according to one of claims 1 to 6, characterized in that the transmission element (37) is guided rectilinearly in the fastening section (13). Bending tool (1) according to one of claims 1 to 6, characterized in that the transmission element (37) by means of a pivot bearing (52) in the mounting portion (5) is guided. Bending tool (1) according to one of claims 1 to 8, characterized in that the contact element (13) is designed as a cylindrical contact pin (17). Bending tool (1) according to one of claims 1 to 9, characterized in that the contact element (13) in an electrically insulating guide sleeve (18) is guided. Bending tool (1) according to claim 10, characterized in that an optionally the contact surface (14) contacting the contact portion (20) of the contact element (13) in the rest position (21) is completely retracted in the guide sleeve (18). Bending tool (1) according to one of the preceding claims, characterized in that the functional element (10) is formed by a measuring element, in particular an electrical measuring transmitter (11). Bending tool (1) according to claim 12, characterized in that the encoder (11) is designed to detect a geometric size of a workpiece to be machined with the bending tool (1). Bending tool (1) according to one of the preceding claims, characterized in that the functional element (10) comprises a memory element, in particular for storing tool data. Tool holder (2) on a bending machine, in particular a press brake, with a receiving section (4) for coupling a fastening section (5) of a bending tool (1) and an electrically conductive contact surface (14) connected to a power supply device or a control device (4) on the receiving section (4). .
characterized in that for the adjustment on demand of the attachment portion (5) between a rest position (21) and a contact position (23) adjustably mounted contact element (13) on the receiving portion (4) an adjustably mounted, with an adjustment (26) connected, the Contact element (13) in the contact position (23) bringing actuator (24) is arranged. Tool holder (2) according to claim 15, characterized in that the actuating member (24) by a fastening portion (5) on the receiving portion (4) fixing the clamping element (34) is formed. Tool holder (2) according to claim 16, characterized in that the clamping element (34) as a with a keyway (36) on the mounting portion (5) cooperating wedge element (35) is formed. Tool holder (2) according to one of claims 15 to 17, characterized in that the contact surface (14) is formed on a in a longitudinal direction of the receiving portion (4) extending, in particular in a tool receiving groove (6) arranged contact rail (15). Bending machine, in particular a press brake with a movable pressing beam and a fixed press table, with a tool holder (2) on the pressing beam or press table and a bending tool (1) coupleable thereto, characterized in that the bending tool (1) according to one of claims 1 to 14 and the tool holder (2) according to one of claims 15 to 18 is formed. Method for electrical coupling of a functional element (10) to a bending tool (1) with a contact surface (14) on a tool holder (2) by means of a contact element (13) adjustably mounted on the bending tool (1), characterized in that in a first step Bending tool (1) is moved to its intended position on the tool holder (2) and in a subsequent second step, the contact element (13) by means of an on the tool holder (2) formed actuating member (24) from a contact surface (14) spaced rest position ( 21) in a contact surface (14) contacting the contact position (23) is adjusted.

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