EP2701860B1 - Tool holder for press brake - Google Patents

Description

The invention relates to a method according to claim 1 and a tool holder for a press beam according to claim 6.

To perform different bending tasks on a press brake is often a change of bending tools required. The tool change is a tedious job especially for large, heavy bending tools that physically burden the operator and can reduce the productive time of such a press brake sensitive. For example, from the prior art DE 149 439 A Systems are known which facilitate a user changing a tool by a tool holder between a working position and a change position is adjustable. Furthermore, for example DE 1 602 595 A to shorten set-up times revolver-like rotatable tool holder known that can accommodate different tools simultaneously and a tool change can be done by simply rotating the revolver-like tool holder. For press brakes these known from the prior art solutions are not satisfactory because revolver-like tool holder require extensive changes to the machine concept of a press brake and exchange of a bending tool has not been much easier.

The object of the invention is to further facilitate the bending tool change on a press brake. The object of the invention is achieved by a method according to claim 1 or a tool holder according to claim 6. Characterized in that the adjusting device and the holding device by means of a coupling arrangement operatively connected, that are coupled, it is ensured that an inserted bending tool is reliably fixed in the working position of the receiving body and further in the change position, a simple removal of a tool without additional measures is possible. In order to change a bending tool on a conventional press brake, for example on an upper beam, the tool clamping is to be solved in the conventional machines in a first step and then lower the tool in the vertical direction, which can represent a heavy physical load at higher tool weights, as from releasing the tool clamping or tool locking, lower the tool against the force of gravity is what represents an enormous static muscle load. According to the holding section of a bending tool is released only in the change position of the receiving body by the holding device is deactivated and differs by the pivoting of the receiving body, the direction of the weight of the removal direction of the bending tool.

The holding device is designed so that a bending tool located in the receiving body is fixed in the working position such that forces acting on the bending tool, such as weight forces and forces resulting from a forming operation are transmitted without relative movement of the bending tool within the tool holder.

This fixation can be done non-positively, for example, by a clamping device and can also be done alternatively or additionally a positive fixation of the bending tool in the receiving body. For safety reasons, a positive fixing is often prescribed for heavier tools in order to prevent falling out of a bending tool from the tool holder.

An advantageous variant of the method consists in the embodiment according to claim 2, whereby in the adjustment position of the receiving body, a position adjustment of a bending tool can be performed. The fixation by the holding device is thereby partially canceled in the adjustment position, with a given between holding device and bending tool form fit is maintained, so a removal or falling out of the bending tool from the tool holder is not possible. Any existing clamping is canceled in the adjustment position or reduced so much that a move within the tool interface is possible.

Of advantage may also be a bushing according to claim 3, whereby the current position or position of the receiving body can be easily calculated by a machine control and driven therefrom drives to carry out the linear movement and the subsequent pivoting movement. The linear movement is advantageously carried out over a relatively short displacement of up to a few centimeters, while the subsequent pivoting movement is performed by a pivot angle, which allows easy insertion or removal of a bending tool. Such a sequence of movements can with simple guide arrangements and possibly acting adjusting drives are accomplished and realized by structurally simple linear guides and pivot bearings.

The process implementation according to claim 4 causes the adjustment movement in the first phase either vertically upwards or vertically downwards, and after this phase, the adjustment of the bending tools within the tool interface is possible, including a prior pivoting of the tool holder or the receiving body is not required is. The pivoting of the receiving body in the change position is thus carried out only in the event that a bending tool to be used or removed. For a pure adjustment, the adjustment is limited to the linear movement to achieve the adjustment position.

Carrying out the method according to claim 5 is advantageous for an operator since a bending tool does not have to be removed directly when the change position is reached, but rather the bending tool is provided to some extent in the released position with the holding device deactivated, without being secured by the user or some handling device would have to be. In the case of a groove-like tool interface, this is the case if the bending tool is tilted due to its own weight in the tool interface and thereby, despite the holding device being deactivated, without any positive locking, a frictional fixing in the receiving body is provided. This is the case, for example, when the groove-like tool interface points in a horizontal direction or in a slightly rising direction.

The object of the invention is achieved as already mentioned by a tool holder according to claim 6, wherein the coupling between the adjusting movement and the activation or deactivation of the holding device is effected by a coupling arrangement which brings the adjusting device into operative connection with the holding device. The coupling arrangement may comprise mechanical components and alternatively or additionally also control-technical components, wherein in both cases the coupling of adjusting movement and tool fixing or tool unlocking is achieved.

In one embodiment of the tool holder according to claim 7, a form-fitting fixing of the bending tool in the receiving body is possible by the positive locking element, the Increased security for an operator causes. The recess on the holding portion often has a V-groove-like shape into which a wedge-shaped portion of a positive locking element can be introduced. The positive locking causes the holding portion can not escape from the groove-like tool interface and allows at a reduced clamping force adjusting the bending tool within the tool holder in the longitudinal direction of the groove-like tool interface.

Due to the embodiment according to claim 8, the coupling function can be effected by structurally simple means by the contact element virtually scans the position of the receiving body relative to the pressing beam and converts an adjustment of the contact element in an adjustment of the positive locking element. This conversion can be realized by various types of motion gears in the kinematic sense. Between used components, push joints, swivel joints, bending joints, rolling joints, etc. can be used.

Due to the embodiment according to claim 9 required for the adjustment of the positive locking element in the release position energy is stored as elastic energy in the biasing member in working position of the receiving main body and no separate drive for the holding device or the interlocking element is required, the interlocking element in the change position disengaged brings with the holding section.

According to claim 10, the contact element may be designed as a pressure plate which is pressed in the working position between the receiving body and the pressing beam. Such a flat design of the contact element allows a reliable coupling between adjustment and holding device and the type of adjustment can be changed in many areas without the characteristic of the coupling arrangement changes significantly.

The embodiment of the tool holder according to claim 11 ensures that the receiving body or the pressure plate arranged between receiving body and pressing beam during a bending operation, even with transversely acting to the working force components exactly retains the position and no such forces acting on the adjustment or be transmitted from this have to. Corresponding projections can, for example, by Conical projections may be formed, which are integrally arranged on the surface of the press beam or the receiving body, or, for example, as a screw elements which project through a component and project with a tapered approach to a reference surface to the outside.

The coupling of the adjusting arrangement and the holding device can be designed according to claim 12 so that thereby a defined dependence between the adjustment and the position of the contact element is effected relative to the receiving body. For example, a steady increase in the swivel angle can bring about, for example, a steady adjustment of the contact element and thus also of the positive-locking element. Alternatively, it is possible that over the majority of the pivoting angle, the form-locking element remains substantially in engagement with the holding portion of the bending tool and only at the end of the adjustment at a large tilt angle in the vicinity of the change position release from the positive connection element is effected.

In order to fix with a tool holder according to the invention also different width bending tool without retooling and reliable, this can be carried out according to claim 13. Only spring tongues are active, which contact a holding section of a bending tool in the tool interface. The contact forces exerted by the individual spring tongues remain within a defined range, since each spring tongue can exert only a certain maximum force.

As an alternative to the above-described embodiment, the tool holder according to claim 14 can be designed with two or more clamping elements and the contact force acting on the contact element from the pressing beam contact force can be evenly distributed to the individual active clamping elements distribution lever.

An embodiment of the tool holder according to claim 15 allows despite using a structurally and control technology simple adjustment in the form of a linear actuator a cost-effective way to effect the adjustment of the receiving body. By suitable movement elements, the linear movement can also be converted into the pivoting movement of the receiving body.

Due to the embodiment according to claim 16, the adjustment is easy to implement, since the movement of the two pivot points causes in a simple manner and can also be changed. By a synchronous linear movement of the two articulation points a linear rectilinear adjustment of the receiving body is easily achievable and can be used by fixing one of the two articulation points of this as a pivot axis for the pivotal movement of the receiving body.

The development according to claim 17 is a structurally simple way to realize a combination of a linear movement and a pivoting movement.

As an alternative to the mechanical coupling arrangements described above, these can also comprise control engineering components according to claim 18 or be realized by such, whereby for a user the same advantageous functionality of a simplified and easier tool change is given.

The embodiment according to claim 19 allows an operator to remove the tool approximately in the horizontal direction from the tool holder or to insert into this and ensures this change position that a Biegewerkzug remains in the change position despite deactivated holding device in the tool interface. A horizontal alignment of the tool interface is additionally advantageous for an automated bending tool change by means of a handling device.

The embodiment according to claim 20 makes it possible to spend a bending tool even without the receiving body in changing position to insert or remove in the tool holder. The actuating means acts directly or indirectly on the clamping device or form-fitting device and decouples them to some extent from the adjusting movement.

Another advantage is an embodiment according to claim 21, since thereby the change position can be set as needed before or after the work plane. Thus, for example, can be facilitated by an operator by a change position in front of the working level, the manual tool change, while a change position behind the working level can facilitate an automated tool change from the back of the machine.

According to claim 22, a tool holder according to the invention can also be designed advantageously on a pressing beam such that the adjusting device of the tool holder is integrated in the pressing beam.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Fig. 1

Einen Schnitt durch einen erfindungsgemäßen Werkzeughalter in Arbeitsstellung;

Fig. 2

einen Schnitt durch einen Werkzeughalter gemäß Fig. 1 in Wechselstellung;

Fig. 3

einen Schnitt durch einen Werkzeughalter in einer weiteren Ausführungsform in Arbeitsstellung;

Fig. 4

einen Schnitt durch einen Werkzeughalter gemäß Fig. 3 in Wechselstellung;

Fig. 5

einen Schnitt durch einen Werkzeughalter in einer weiteren Ausführungsform;

Fig. 6

einen Schnitt durch einen Werkzeughalter in einer weiteren Ausführungsform;

Fig. 7

eine weitere mögliche Ausführungsform für eine Koppelanordnung an einem erfindungsgemäßen Werkzeughalter;

Fig. 8

eine Ansicht der Koppelanordnung in einem Werkzeughalter in einem Schnitt entlang Linie VIII-VIII in Fig. 5.

Each shows in a highly schematically simplified representation:

Fig. 1

A section through a tool holder according to the invention in working position;

Fig. 2

a section through a tool holder according to Fig. 1 in change position;

Fig. 3

a section through a tool holder in another embodiment in working position;

Fig. 4

a section through a tool holder according to Fig. 3 in change position;

Fig. 5

a section through a tool holder in a further embodiment;

Fig. 6

a section through a tool holder in a further embodiment;

Fig. 7

a further possible embodiment of a coupling arrangement on a tool holder according to the invention;

Fig. 8

a view of the coupling arrangement in a tool holder in a section along line VIII-VIII in Fig. 5 ,

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, wherein 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 location information selected in the description, such as above, below, laterally, etc. related to the immediately described and illustrated figure and are to be transferred to a new position in a change in position.

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 sectional view of a bending tool 1, which is inserted and fixed in a tool holder 2. The tool holder 2 has for this purpose a groove-like tool interface 3, in which a holding portion 4 of the bending tool 1 is inserted. The tool holder 2 comprises a receiving body 5, which has the tool interface 3. The receiving body 5 extends along the longitudinal direction of a press beam 6 of a vertical press brake, not shown. In Fig. 1 the vertical working plane 7 is shown.

The fixing of the holding portion 4 of a bending tool 1 in the tool interface 3 by means of a holding device 8, in which the insertion or removal of a bending tool 1, the fixation can be disabled. The holding device 8 can in this case use a frictional fixing, for example by a clamping device, but preferably it comprises a positive locking element 9 which is adjustable in a recess 10 on the holding portion 4 of the bending tool 1. As long as the interlocking element 9 protrudes into the recess 10, a bending tool 1 can not be removed in the removal direction 11 from the tool interface 3. Fig. 1 shows the positive-locking element in a fixing position 12, in which it projects into the recess 10 of the holding portion 4. The positive-locking element 9 in the activated fixing position 12 prevents removal or falling out of the bending tool 1 from the tool interface 3 due to its positive-locking action.

The receiving body 5 is located in Fig. 1 in a working position 13, in which it rests with its upper outer side 14 on the undersides of the press beam 6 and can transfer forming pressure beam 6 and bending tool 1.

Fig. 2 shows the tool holder 2 according to Fig. 1 , wherein the receiving body 5 by means of an adjustment 15 in one of the working position 13 according to Fig. 1 different change position 16 is adjusted. The adjusting device 15 thus serves to transfer the receiving body 5 from the working position 13 in an adjustment 17 in the change position 16. The adjusting movement 17 in this case comprises a pivoting movement 18, by means of which the removal direction 11, which is dependent on the position of the tool interface 3, is changed by a swivel angle 19. In the in Fig. 2 illustrated change position 16 corresponds to the removal direction 11 of an approximately horizontal direction. That is, a bending tool 1 is moved when removing from the tool holder 2 in the horizontal direction to the left in the removal direction 11 and moves when inserted into the tool holder 2 to the right in a not specifically shown insertion direction.

In order to effect the pivoting angle 19 between the working position 13 and the change position 16, the adjusting device 15 comprises a pivoting arrangement 20, which in the embodiment according to Fig. 1 and 2 a simple rigid pivot axis 21 on the pressing beam 6, around which the receiving body 5 is mounted pivotably. For carrying out the adjusting movement 17, which in the illustrated embodiment according to Fig. 1 and 2 consists only of a pure pivoting movement 18, the receiving body 5 is coupled to an adjusting drive, not shown, which introduces the adjustment forces or Verstellmomente required for adjustment in the receiving body 5. For example, a coincident with the pivot axis 21 pivot shaft may be provided, which is connected to the receiving body 5 torque-resistant and which is driven by a lever or a motor. The receiving body 5 and a possibly inserted therein bending tool 1 remains in the change position 16 until it is moved back to the working position 13. The position assurance in the change position 16 as well as in the working position 13 can be done by the adjustment, by this is carried out self-holding or by an independent position assurance. The position of the pivot axis 21 and the outer shape of the pressing beam 6 and receiving body 5 are chosen so that the Pivoting movement 18 can be performed freely, with an optional pivoting on both sides of the working level 7 can also be provided.

In the change position 16, the holding device 8 is deactivated in order to enable the setup, whereby a bending tool 1 can be removed in the removal direction 11 and inserted into the tool interface 3 opposite thereto. In a clamping device, the clamping forces are released or reduced so that a removal and insertion of a bending tool 1 is possible. In the illustrated holding device 8 with a form-locking element 9, this is from the in Fig. 1 illustrated fixing position 12 in an in Fig. 2 shown release position 22 spent in which it does not protrude into the recess 10 on the holding portion 4 of the bending tool 1 and this does not interfere with the movement in the tool interface 3.

According to the invention, the adjusting device 15 is coupled to the holding device 8 such that the holding device 8 is activated in the working position 13 of the receiving body 5 and is deactivated in the change position 16. For this purpose, adjusting device 15 and holding device 8 are operatively connected by means of a coupling arrangement 23. The fitting of bending tools 1 is substantially facilitated by the tool holder 2 according to the invention, since the coupling arrangement 23 causes the holding device 8 is activated in the working position 13 and a bending tool 1 is fixed for a forming operation on the pressing beam 6 and the holding device 8 in the change position 16th is automatically deactivated, whereby a tool change can take place. In addition, the tool change is substantially facilitated by a given between working position 13 and change position 16 swivel angle 19.

If in a conventional tool holder, which is not pivotable, the holding device 8 is deactivated for a tool change, the weight of the bending tool 1 is suddenly effective and this must be collected by the user or a suitable support structure. By the vertical removal direction 11 further bending tool 1 must then be controlled and lowered sensitively, to which a vertically upwardly acting support force is required, which must correspond to the weight force at a slow movement about. This requires of an operator high static muscle forces that still need to be dosed sensitively. The same request is for a handling device, for example an industrial robot which is used for an automated tool change, valid.

By pivoted about the pivot angle 19 change position 16 of the receiving body 5, a corresponding angle between the vertical downward weight force and the removal direction 11 results. The swing angle is about 90 °, as in Fig. 2 shown, the bending tool 1 is initially held by the receiving body 5 after deactivation of the holding device 8. To remove a bending tool 1, an operator relieves the tool interface 1 by lifting the bending tool 1 and this can be removed from the tool interface 3 in a brisk movement without any special requirements for metering the speed of movement in the horizontal direction. As a result, a static muscle load, as is the vertical removal of a bending tool 1, largely prevented and tool change can also be supported by means of simple devices, since they must be formed only for an approximately horizontal movement of bending tools 1 and not for a controlled lowering.

The coupling arrangement 23 can be based on mechanical operation or else on control technology operation. In Fig. 1 and 2 is as an exemplary embodiment of a mechanical coupling between the adjusting device 15 and the holding device 8, a contact element 24 on the receiving body 5 adjustably mounted, which cooperates with the pressing beam 6, in which it can scan the relative position of the receiving body 5 to the pressing beam 6 and an adjustment of the contact element 24th causes an activation or deactivation of the holding device 8, in which the adjusting movement is mechanically transmitted to the interlocking element 9.

Fig. 1 shows the receiving body 5 in the working position 13, in which the outer side 14 of the receiving body 5 rests against the underside of the press bar 6. Thereby, the contact element 24, which may be, for example, a simple rounded bolt in a bore in the receiving body 5, pressed into the interior of the receiving body 5 and transmit this position in the fixing position 12 of the positive-locking element 9. For this purpose, the contact element 24 is connected to the positive-locking element 9 with transmission elements (not shown). By contrast, shows Fig. 2 the receiving body 5 in changing position 6, in the the outer surface 14 does not abut the pressing beam 6. The contact element 24, which is resiliently mounted in the receiving body 5, can thereby emerge from this, wherein this position of the contact element 24 is transferred to the release position 22 of the positive-locking element 9. The same functionality of the automatic activation or deactivation of the holding device 8 can be given even without a positive locking element 9 in a non-positively acting holding device 8, but can be achieved by a clamping element.

Such a contact element 24, which to some extent scans the outer surface of the press bar 6 during the adjusting movement 17, can also be used to partially deactivate the holding device 8 in an intermediate position between the working position 13 and the change position 16 of the receiving body 5, whereby the removal takes place a bending tool 1 in removal direction 11 is still prevented, however, a displacement of the holding portion 4 in the longitudinal direction of the groove-like tool interface 3 is made possible transversely to the removal direction 11. This can be effected by slightly withdrawing or relieving the positive-locking element 9, as a result of which the rigid fixation in the tool interface 3 can be canceled. Such an intermediate position of the receiving body 5 may be referred to as adjustment position 25, which in Fig. 2 indicated in dashed lines. This controlled influencing of the holding device 8 can be brought about, for example, by setting the displacement path of the contact element 24 relative to the receiving body 5 by a mechanical control element 26 in relation to the currently prevailing swivel angle 19. The control is in the embodiment according to the Fig. 1 and 2 formed by the outer surface 27 of the press bar 6, which creates the desired relationship between pivoting angle 19 and partial deactivation of the holding device 8 by appropriate shaping. The outer surface 27 may be formed in the form of a suitable cam.

As an alternative to a contact element 24 which scans the outer surface 27, it is also possible to provide a control lever which connects the pressing beam 6 to the holding device 8 and converts the adjusting movement 17 of the receiving body 5 into an adjusting movement of the positive-locking element 9. For this purpose, the control lever is attached to the holding device 8 and at a distance from the pivot axis 21 articulation point on the pressing beam 6.

Fig. 1 and 2 further show a recess 28 on the underside of the press bar 6, which cooperates in the working position 13 of the receiving body 5 with a projection 29 on the outer side 14 of the receiving body 5. This serves to secure the position of the receiving body 5 in the possible occurrence of forming forces, which are oriented transversely to the working plane 7 and serves to relieve the adjustment 15, which would otherwise contribute to the transmission of power.

In Fig. 1 is further shown as an alternative to the mechanical coupling arrangement 23 shown with dotted lines control technology coupling assembly 23, in which the position or position of the receiving body 5 by means of a position sensor 30, for example, a rotary encoder in the pivot axis 21 is detected and a control device 31 is provided, the as a function of the determined position of the receiving body 5 outputs control signals to an actuator 32 of the holding device 8. If the working position 13 of the receiving body 5 is detected by the position sensor 30, the holding device 8 is activated by means of the actuator 32 which acts in particular on the positive-locking element 9, while the holding device 8 is deactivated by the control device 31 when the change position 16 of the receiving body 5 is detected.

The fixed part of the tool holder 2 illustrated in the figures as a pressing beam 6 can also be a base part detachably fastened to the actual pressing beam of a press brake, which can be removed from the pressing beam together with the receiving body 5 when the tool holder 2 is replaced.

In the 3 and 4 is a schematic sectional view of a further embodiment of a tool holder 2, wherein in Fig. 3 the working position 13 of the receiving body 5 and in Fig. 4 the change position 16 of the receiving body 5 is shown. Unlike the embodiment according to Fig. 1 and 2 in which the adjusting movement effected by the adjusting device 15 is a pure pivotal movement 18 due to the pivot axis 21 which is rigid on the pressing beam 6, the adjusting device 15 effects in the 3 and 4 an adjusting movement 17, which is composed of a linear movement 33 and a pivoting movement 18. This composite adjusting movement 17 is achieved in that two spaced apart articulation points 34 and 35 are arranged on the receiving body 5, which are guided or driven by the adjusting device 15 in a suitable manner.

In order to effect a linear movement 33 of the receiving body 5, the two articulation points 34 and 35 are adjusted in the parallel direction and by the same distance, whereby the linear movement 33, that is, a translational movement is effected. At the end of this linear movement 33, for example, the first articulation point 34 is fixed in its position, while the second articulation point 35 is guided on a circular path about the first articulation point 34. The first articulation point 34 thereby forms a pivot axis 21 for a relative pivoting movement 18 of the second articulation point 35 and thus also of the receiving body 5.

In Fig. 2 the left pivot point 34 is fixed at the end of the linear movement 33 and pivoted in a row of the right pivot point 35 on a circular path, whereby a pivoting movement of the receiving body 5 is caused to the left. Of course, a pivoting movement to the right can also be effected, in which the right articulation point 35 is fixed and the left articulation point 34 is guided around this on a circular path. If the linear movement 33 is omitted, the adjusting movement 17 corresponds to the simple pivoting movement 18 in FIG Fig. 1 and 2 ,

As in Fig. 4 is further shown, the adjusting movement 17 may include a pivoting movement 18 ', which pivots the receiving body 5 with respect to the working plane 7 to the right in an alternative change position 16', whereby a tool change from the other side of the machine is possible. This optional pivoting in both directions with respect to the working plane 7 is made possible by appropriate design of the adjusting device 15.

In the 3 and 4 forms with respect to the working plane 7 left pivot point 34, a first pivot axis 21 and the working plane right pivot point 35 a second pivot axis 36. Depending on how the pivot points 34 and 35 are guided by the adjustment 15, either the left pivot axis 21 or right pivot axis 36 to achieve the pivot angle 19. In this embodiment, the adjusting device 15 based on structurally simple to implement linear guides, by means of which the articulation points 34 and 35 are moved. The left articulation point 34 is guided by means of a first linear guide 37 relative to the pressing beam 6 and the right articulation point 35 is guided by means of a second linear guide 38 relative to the pressing beam 6. The linear guide 37 can For example, be structurally very easily formed by a straight guide rod 39 which is slidably mounted in a bore 40 in the pressing beam 6 and is pivotally connected at its lower end to the articulation point 34. The bore 40 advantageously runs parallel to the working plane 7, but could also have a different direction. A displacement of the guide rod 39 in the bore 40 thus causes a linear movement of the left articulation point 34. The right second linear guide 38 is also formed for example by a guide rod 39 and a bore 40 in the pressing beam 6. However, since the right pivot point 35 is not limited to a linear movement 33 but should also perform a pivoting movement 18, a steering lever 41 is interposed between the lower end of the right guide rod 39 and the second pivot point 35. Alternatively, other possibilities are given for the second pivot point 35 in addition to the given by the linear guide 38 degree of freedom in working direction 7 to provide a degree of freedom transversely thereto, for example by the pivot point 35 is not fixed to the receiving body 5 but for example in a backdrop transverse to the direction of Linear guide 38 is guided.

3 and 4 show further a possible embodiment of the holding device 8, as well as the coupling arrangement 23, with which the holding device 8 can be activated or deactivated in dependence on the position of the receiving body 5. The holding device 8 comprises in the illustrated embodiment, a positive locking element 9, which in the working position 13 (see Fig. 3 ) engages in a recess 10 on the bending tool 10 and this fixed in the tool holder 2 and in the change position 16 (see Fig. 4 ) is moved out of the recess in the release position 22 and a bending tool 1 releases. The contact element 24 is formed in this embodiment by a pressure plate 42 which is mechanically coupled via the coupling arrangement 23 with the positive-locking element 9. The pressure plate 42 is pressed in the working position 13 by the receiving body 5 against the pressing beam 6 by the adjusting 15 biases the receiving body 5 in the working position 13 in the direction of the press beam. If the receiving body 5 is released from the pressing bar 6 by means of the adjusting device 15, the pressure plate 42 is brought away from the receiving body 5 by means of a biasing element 43, for example in the form of a compression spring, thereby displacing the positive-locking element 9 from the fixing position 12 into the release position 22. Alternatively, a biasing member 44 may also act on the interlocking element 9, in which it biases this in the release position 22. By the displacement of the contact element 24, here in the form of a pressure plate 42, as described above, the activation or deactivation of the holding device 8 also take place so that in an intermediate position between working position 13 and release position 16 an adjustment position is taken, in which a displacement of bending tools 1 in the longitudinal direction of the groove-like Recess 3 is possible.

In the Fig. 5 is a further and possibly independent embodiment of the / the tool holder 2 is shown, again for like parts, the same reference numerals or component names as in the preceding Fig. 1-4 be used. In order to avoid unnecessary repetition, the detailed description in the previous ones will be used Fig. 1-4 referred or referred.

The adjusting device 15 corresponds in the embodiment according to Fig. 5 like the one in 3 and 4 illustrated mechanism in which two articulation points 34 and 35 are spaced apart transversely to the working plane 7 and which are guided by means of two arranged in the pressing beam 6 linear guides 37 and 38. In this embodiment, the left linear guide 37 between the guide rod 39 and the left pivot point 34, a steering lever 45 which is connected at the lower end of the guide rod 39 with a hinge 46. This joint 46 is deactivated in the illustrated embodiment by means of a locking pin 47, which passes both the left guide rod 39 and extends into the left steering lever 45. The locking pin 47 thus prevents pivotal movement of the second steering lever 45 in the joint 46 and the left pivot point 34 is adjustable only on a straight line.

The right pivot point 35 is as already based on Fig. 4 described, along a straight line movable and further lowering of the right guide rod 39 causes after fixing the left pivot point 34 via the steering lever 41 pivotal movement of the second pivot point 35 to the left fixed pivot point 34 and thus a pivotal movement of the receiving body 5. The two guide rods 39 the linear guides 37 and 38 are driven by means of a linear actuator 48, for example in the form of a hydraulic cylinder, which transmits via a drive plate 49 a downward movement on a collar 50 on the right guide rod 39 and its upward movement via a paragraph 51 on a collar 52 on the left guide rod 39 transmits. The downward movement The left guide rod 39 is thereby blocked by means of a stop element 53, which thereby defines the end of the linear movement 33. During the downward movement of the drive plate 49, the right guide rod 39 is thus driven, which also carries the left guide rod 39 up to the stop element 53 via the receiving body 5. The return to the working position 13 is carried out by lifting the drive plate 49, whereby the receiving body 5 can swing down due to its own weight in the working position 13 while the right guide rod 39 pushes up and in succession by raising the Federal 52 on the paragraph 51, whereby the left guide rod 39 is lifted together with receiving body 5 and the right guide rod 39 and is pressed in the working position 13 against the pressing bar 6.

In the pivoting movement 18, the position of the contact element 24 in the form of the pressure plate 42 by means of a control element 26 in the form of a control cam 54 in relation to the pivot angle 19 is set. The control cam 54 has a variable radius, wherein in the illustrated embodiment, the minimum radius 55 is achieved at a pivoting angle of 19 of about 90 °.

The embodiment according to Fig. 5 is also characterized by the fact that the linear guides 37 and 38 are symmetrical to the working plane 10 and further can be changed by converting the stop member 53, the drive plate 49 and the locking pin 47 on the right side of the pivoting direction from left to right. This can also take place in that the two linear guides 37 and 38 each receive their own drives, and the deactivation of the steering levers 41 or 45 at the lower end of the guide rods 39 by means of a locking bolt 47 can also be optionally. The adjusting device 15 can thus also optionally opposing pivotal movements 18, 18 'allow, whereby change positions 16, 16', can be taken on both sides of the working level 7.

An optional pivoting of the receiving body 5 in both directions, ie with respect to the working plane 7 to the left or to the right, is also feasible in an embodiment with only one pivot axis 21, which can lie in particular in the working plane 7.

In the Fig. 6 shows a further and possibly independent embodiment of the receiving body 5, as it can be used in a tool holder 2. In particular, it is suitable for use with an adjusting device 15 Fig. 5 suitable. Again, the same reference numerals and component names are for the same parts as in the preceding Fig. 1-5 used. In order to avoid unnecessary repetition, the detailed description in the previous ones will be used Fig. 1-5 referred or referred.

Fig. 6 shows an alternative embodiment of the holding device 8, which is activated or deactivated by means of the contact element 24, here again in the form of a pressure plate 42. The form-fitting element 9 here consists of a clamping strip 56, which extends in the longitudinal direction of the groove-like tool interface 3 and is pivotally mounted about a pivot point 57 in the receiving body 5. The fixing of the holding section 4 in the tool interface 3 via spring tongues 58, which are generated by parallel cuts in the terminal block 56. The clamping strip 56 or the individual spring tongues 58 have projections which can be adjusted into the recess 10 of the bending tool 1. The adjustment is effected by a wedge element 59 which also extends in the longitudinal direction of the groove-like tool interface 3 and is vertically adjusted by the contact element 24, wherein a wedge surface 60 converts the vertical adjustment of the wedge member 59 in a pivotal movement of the terminal block 56.

The articulation points 34 and 35 are as in the embodiment according to the Fig. 3, 4 and 5 arranged on Anlenkfortsätzen 61, which distance the articulation points 34, 35 from the receiving body 5 and thereby the left articulation point 34, which serves as the pivot axis 21 after the end of the linear movement 33, can lie in the working position within the press bar 6.

Fig. 7 shows yet another embodiment of a holding device 8, which in the 3 and 4 shown holding device 8 is similar and in which an adjustment of a contact element 24 causes a displacement of the positive-locking element 9. In the illustrated embodiment, an actuating element 62 is arranged in the pressing beam 6, whose operation, for example by pulling, the same effect on the holding device 8 and the contact element 24 has as an adjustment of the receiving body 5. This allows a bending tool 1 regardless of the position of the receiving body 5 relative to the pressing beam 6 are removed by the additional actuator 62 from the tool interface 3. Such an actuating element 62 may alternatively also be provided on the receiving body 5, wherein this can also temporarily deactivate the holding device 8 independently of the position of the receiving body 5, if necessary.
Fig. 8 shows a section through a receiving body 5 with a further embodiment of the holding device 8. The section in Fig. 8 corresponds to a section along the line VIII - VIII in Fig. 5 , The movement of the contact element 24 in the form of a pressure plate 42 via force application points 64 and downstream distribution lever 65 to the individual form-fitting elements 9, here in the form of clamping elements 66, distributed forwarded.
An inventive tool holder 2 can also be combined with bending tools 1, which themselves have an integrated Sicherheitsvernegelung with an operation directly on the bending tool 1, wherein the tool change can also be substantially facilitated.
The embodiments show possible embodiments of the tool holder 2, wherein it should be noted at this point that the invention is not limited to the specifically illustrated embodiments of the same. For the sake of order, it should finally be pointed out that, for a better understanding of the construction of the tool holder, this or its components have been shown partly unevenly and / or enlarged and / or reduced in size. <B> Reference Numbers </ b> 1 bending tool 36 swivel axis 2 toolholder 37 linear guide 3 Tool interface 38 linear guide 4 holding section 39 guide rod 5 receiving body 40 drilling 6 pressing bars 41 steering lever 7 working level 42 printing plate 8th holder 43 biasing member 9 Form-fitting element 44 biasing member 10 recess 45 steering lever 11 removal direction 46 joint 12 fixing position 47 locking pin 13 working position 48 linear actuator 14 outer surface 49 takeaway 15 adjustment 50 Federation 16 change position 51 paragraph 17 adjustment 52 Federation 18 pivotal movement 53 stop element 19 swivel angle 54 cam 20 swivel assembly 55 minimum distance 21 swivel axis 56 terminal block 22 release position 57 pivot point 23 coupling arrangement 58 spring tongue 24 contact element 59 key member 25 adjustment position 60 wedge surface 26 control 61 Anlenkfortsatz 27 outer surface 62 actuator 28 recess 63 feather 29 head Start 64 Force application point 30 position sensor 65 Verteilhebel 31 control device 66 clamping element 32 actuator 33 linear motion 34 articulation 35 articulation

Claims (22)

1. A method for inserting or removing at least one bending tool (1) at a tool holder (2) of a vertically operating press brake, in which a receiving body (5) provided with a slot-like tool interface (3) is transferred from an operating position (13) into a changing position (16) by means of an adjusting movement (17) in relation to a press beam (6) of the press brake, and the angular position of the receiving body (5) is thereby changed by a pivoting angle (19), characterized in that for releasably fixing a holding portion (4) of at least one bending tool (1) at the tool interface (3), a holding device (8) is coupled with the adjusting movement (17), and the holding device (8) is automatically activated by adjusting the receiving body (5) into the operating position (13) and is automatically deactivated by adjusting the receiving body (5) into the changing position (16).
2. The method according to claim 1, characterized in that when adjusting the receiving body (5) into an adjustment position (25) situated between the operating position (13) and the changing position (16), the holding device (8) is partly deactivated and as a result of this, a displacement of the holding portion (4) transverse to the removing direction (11) within the tool interface (3) can be carried out.
3. The method according to claim 1 or 2, characterized in that the adjusting movement (17) from the operating position (13) into the changing position (16) is composed of a linear movement (33) and a subsequent pivoting movement (18).
4. The method according to claims 2 and 3, characterized in that the adjustment position (25) is reached at the end of the linear movement (33).
5. The method according to any one of claims 1 to 4, characterized in that in the changing position (16), the tool interface (3) is oriented in such a manner that a bending tool (1), even with the holding device (8) being deactivated, remains at the tool interface (3) or the receiving body (5) due to its deadweight.
6. A tool holder (2) for a press beam (6) of a press brake, comprising a receiving body (5) with a slot-like tool interface (3), an adjusting device (15) for adjusting the receiving body (5) in relation to the press beam (6) between an operating position (13) and a changing position (16), wherein the adjusting device (15) comprises a pivoting arrangement (20) by means of which the angular position of the receiving body (5) between the operating position (13) and the changing position (16) can be changed by a pivoting angle (19), and a holding device (8) for releasably fixing a holding portion (4) of at least one bending tool (1) at the tool interface (3), characterized in that the adjusting device (15) and the holding device (8) are operatively connected by means of a coupling arrangement (23), and the coupling arrangement (23) activates the holding device (8) in the operating position (13) and deactivates it in the changing position (16).
7. The tool holder (2) according to claim 6, characterized in that the holding device (8) comprises a form-fitting element (9) which is adjustable in a recess (10) of the holding portion (4) and which can be brought into an activated fixing position (12) that locks the holding portion (4) against removal, and into a deactivated release position (22) which releases the holding portion (4).
8. The tool holder (2) according to claim 7, characterized in that the coupling arrangement (23) comprises a control or contact element (24) which is mechanically coupled to the form-fitting element (9), adjustably mounted on the receiving body (5) and interacts with the press beam (6), and which, in the changing position (16) of the receiving body (5), moves the form-fitting element (9) into the release position (22).
9. The tool holder (2) according to claim 8, characterized in that the contact element (24) and/or the form-fitting element (9) is preloaded into the release position (22) by means of a preload element (43, 44).
10. The tool holder (2) according to claim 8 or 9, characterized in that in the operating position (13), the contact element (24) is active as a pressure plate (42) between the receiving body (5) and the press beam (6).
11. The tool holder (2) according to any one of claims 6 to 10, characterized in that the outer surface (14) of the receiving body (5) or the pressure plate (42) facing towards the press beam (6) has at least one recess or one projection (29) which, in the operating position (13), interacts with a projection or a recess (28), respectively, on the press beam (6).
12. The tool holder (2) according to any one of claims 8 to 11, characterized in that the adjustment travel of the contact element (24) relative to the receiving body (5) is correlated with the respective currently present pivoting angle (19) by a mechanical control element (26), in particular a control cam (54) surrounding the pivot axis (21).
13. The tool holder (2) according to any one of claims 7 to 12, characterized in that the form-fitting element (9) is formed by a clamping strip (56) which has a plurality of spring tongues (58) and which is adjustable into the tool receiving interface (3) and is actuated by the contact element (24).
14. The tool holder (2) according to any one of claims 7 to 12, characterized in that the form-fitting element (9) is formed by at least two clamping elements (66), and the contact force acting from the press beam (6) onto the contact element (24) is transmitted, proceeding in each case from a force transmission point (64), via distribution levers (65) to the individual clamping elements (66).
15. The tool holder (2) according to any one of claims 6 to 14, characterized in that the adjusting device (15) comprises a linear actuator (48) acting on the receiving body (5).
16. The tool holder (2) according to any one of claims 6 to 15, characterized in that the receiving body (5) has at least two hinging points (34, 35) which are spaced apart from one another and which are guided by the adjusting device (15), and one of which hinging points (34) defines in the course of the adjusting movement (17) a pivoting axis (21) for a relative pivoting movement (18) of the other hinging point (35).
17. The tool holder (2) according to claim 16, characterized in that the receiving body (5) has two pivoting axes (21, 36) which are spaced apart from one another, wherein a first pivoting axis (21) is adjustable relative to the press beam (6) by means of a first linear guide (37), and a second pivot axis (36) is adjustable relative to the press beam (6) by means of a parallel second linear guide (38) and a steering lever (41) connected thereto.
18. The tool holder (2) according to claim 7, characterized in that the coupling arrangement (23) comprises at least one position sensor (30) for detecting the changing position (16), a control device (31) and an actuator (32) for the holding device (8) or the form-fitting element (9).
19. The tool holder (2) according to any one of claims 6 to 18, characterized in that the removing direction (11) of the slot-like tool interface (3) in the changing position (16) of the receiving body (5) extends in the horizontal direction or ascending up to 30° with respect to the horizontal.
20. The tool holder (2) according to any one of claims 6 to 18, characterized in that an actuating element (62) acting on the holding device (8) or the contact element (24) is provided, which contact element enables a deactivation of the holding device (8), at least in the operating position (13) or in each position of the receiving body (5).
21. The tool holder (2) according to any one of claims 6 to 20, characterized in that the receiving body (5) can selectively carry out, by means of the adjusting device (15), two inverse pivoting movements (18, 18') with respect to the operating plane (7) and thereby can adopt changing positions (16, 16') on both sides of the operating plane (7).
22. A press beam (6) comprising a tool holder (2) according to any one of claims 6 to 21, characterized in that the adjusting device (15) of the tool holder (2) is integrated in the press beam (6).

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