Technical field

This invention relates to a system for replacing tools of a press brake.

As is known, press brakes, which are widely used in industrial bending processes, are equipped with a plurality of punches, situated on the movable part of the press, and a plurality of corresponding dies, positioned on a fixed part of the press, which act in conjunction for the machining to be performed.

Depending on the bend to be obtained, the punches and dies may differ in terms of size and/or shapes.

Background art

As is known, in some cases, the bending process is performed by a succession of bends in which various punches (and the respective dies) intervene successively on the part to be bent.

In this situation it is therefore essential to have two or more different punches and dies which are alternately mounted on the press brake. In particular, the punches and dies are mounted on a respective support, substantially in the shape of a bar, known as tool-holder bar, fixed to the press and each equipped with a seat for supporting or engaging the dies and punches.

Each bending system which requires the changing of the bending tools, punches and dies, has tool-holder bars.

In this situation, the punches and dies may be mounted in the respective seats manually one by one. Alternatively, in the processes in which a high level of automation is required, automatic replacement systems are used which, again one by one, change the punches and dies located on the bars. In this situation, the press is stationary and the replacement systems intervene by releasing and withdrawing one by one the punches and dies from the seats made on the tool-holder bars and, at the end of the removal operations, by inserting one by one the new punches and the new dies into the seats in the bars.

According to an alternative embodiment, patent document JP2003136144A illustrates a bending apparatus comprising a press and an integrated tool replacement system.

The punches and dies are locked manually in specific preconfigured housings in order to collect the tools in groups.

These housings, with the relative punches and dies mounted in them, are then inserted and locked in the tool-holder bars of the work surfaces of the press brake.

The tool-holder bars remain locked to the press and the tools are replaced using the above-mentioned housings which allow the simultaneous replacement of groups of tools.

These housings are, in fact, attached to the tool-holder bars and released from them so that the press brake can operate in sequence for various types of machining operations.

The tools can be replaced in groups following a suitable releasing, necessarily manual, of each single punch or die from the corresponding tool collecting housing.

Disadvantageously, the prior art systems for replacing the punches and dies are not very efficient and are particularly slow.

In effect, since the prior art systems have to intervene individually on each punch and on each die for their removal and/or for their insertion in the tool-holder bar or in a template to be inserted subsequently in the toolholder bar, they are complex and very slow. This leads to increases in the time needed for machining work pieces, thereby increasing process costs and costs relating to the final bent product. The prior art systems change a tool directly on the press brake which must be stopped for a long time during the operations for replacing the tools. This aspect considerably reduces the production rate of the press brake which is therefore inefficient and not able to meet production requirements. The technical purpose of the present invention is therefore to provide a system for replacing tools of a press brake which is able to overcome the drawbacks of the prior art.

Aim of the invention

The aim of the invention is therefore to provide a system for replacing tools of a press brake which is able to quickly and efficiently replace the tools of the press.

An aim of the invention is therefore to provide a system for replacing tools of a press brake which is able to perform successive operations for replacing the tools of the press in an effective and versatile manner.

The technical purpose indicated and the aims specified are substantially achieved by a system for replacing tools of a press brake comprising the technical features described in one or more of the appended claims. The dependent claims correspond to possible embodiments of the invention.

In particular, the technical purpose indicated and the aims specified are achieved by a system for replacing tools of a press brake comprising the technical features described in one or more of the appended claims. The dependent claims correspond to possible different embodiments of the invention.

According to a first aspect, the invention relates to a system for replacing tools of a press brake comprising a first work surface and a second working surface movable relative to each other along a direction of movement between a close position and a far position, a first tool-holder bar attached to the first work surface and a second tool-holder bar attached to the second work surface.

The replacement system comprises a device for automatically attaching the first tool-holder bar to the first work surface comprising first engagement elements fixed to the first work surface and second engagement elements fixed to the first tool-holder bar.

The first and second engagement elements are configured to engage with each other, automatically, in such a way as to attach the first tool-holder bar to the first work surface.

According to an aspect, the replacement system comprises a replacement device comprising a supporting rod comprising a first and a second end opposite each other along a main direction of extension and a plurality of pairs of supporting elements. Each element of each pair is constrained to a respective end of the supporting rod and is configured to engage and retain a respective end of a tool-holder bar. The supporting rod is movable in rotation about the axis of extension in such a way as to cyclically face a pair of supporting elements to the press aligning it along a direction of insertion or removal of a tool-holder bar in the press brake. The supporting rod is movable between an operating position, wherein it is close to the press brake to allow the pair of supporting elements facing the press to insert or remove a tool-holder bar in the press brake and a rest position, wherein it is away from the press brake.

The replacement device is configured to act in conjunction with the automatic attachment device to perform an insertion of the first tool-holder bar in the press brake in such a way that the first tool-holder bar is attached to the first work surface, that is to say, in such a way that the second engagement elements are engaged with the first engagement elements.

The replacement device is configured to act in conjunction with the automatic attachment device to perform a removal of the first tool-holder bar from the press brake in such a way that the first tool-holder bar is disengaged from the first work surface, that is to say, that the second engagement elements are disengaged from the first engagement elements. Advantageously, the possibility of inserting or removing a tool-holder bar inside the press brake allows the tools to be inserted or removed in block, thus speeding up the replacement operations.

Advantageously, the possibility of fully automating the process for replacing the tools, and hence the tool-holder bars, further speeds up the replacement operations.

Further features and advantages of the invention are more apparent in the non-limiting description which follows of a non-exclusive embodiment of a device for replacing tools mounted on a tool-holder bar of a press brake.

Brief description of the drawings

The description is set out below with reference to the accompanying drawings which are provided solely for purposes of illustration without restricting the scope of the invention and in which:

- Figure 1A shows a schematic perspective view of a replacement device according to the invention;

- Figure 1 B shows a schematic perspective view of a replacement device according to the invention;

- Figures 2A-2D show, in sequence, a replacement of tools in a press brake.

Detailed description of preferred embodiments of the invention

With reference to the accompanying drawings, the numeral 200 denotes a system for replacing a tool-holder bar B1 , B2 of a press brake 300.

The press brake 300, of substantially known type and described only insofar as necessary for understanding the invention, comprises, schematically, a frame or base 400 illustrated with a dashed line. The press brake 300 comprises a work surface 301 and a work surface 302.

The work surfaces 301 , 302 are movable relative to each other along a direction of movement between a close position and a far position.

According to the embodiment illustrated as an example, the work surface 301 is a lower and fixed work surface whilst the work surface 302 is an upper and movable work surface.

The press brake 300 comprises a tool-holder bar B1 attached to the first working surface 302 and a tool-holder bar B2 attached to the work surface 301.

The term "tool-holder bar" means a rigid support substantially having the shape of a parallelepiped on which at least one tool U1 , U2, in particular punches or dies, of the press brake 300 can be mounted.

For example, a longitudinal seat is made in a tool-holder bar configured to removably receive at least one punch or at least one die, in particular one end of them.

The tools U1 , U2 are locked to the respective tool-holder bar in a substantially known manner, for example by means of screwed grub screws or pneumatic systems.

According to the example illustrated, the press brake 300 comprises punches U1 carried by the tool-holder bar B1 and dies U2 carried by the tool-holder bar B2. Punches and dies are selected and adopted to cooperate with each other in the machining required by the press 300 Different types of tool-holder bars are illustrated, for example, in the WILA catalogue which can be consulted, for example, at the website

Each press brake necessarily comprises tool-holder bars.

The replacement system 200 comprises a replacement device 100 for separating the tool-holder bar B1 from the work surface 302 and/or for separating the tool-holder bar B2 from the work surface 301 and/or for joining the tool-holder bar B1 to the work surface 302 and/or for joining the tool-holder bar B2 to the work surface 301 .

According to the embodiment illustrated for example in the accompanying drawings, the replacement system 200 comprises a replacement device 100 for separating the tool-holder bar B1 from the work surface 302 and for joining the tool-holder bar B1 to the work surface 302 and a second replacement device 100 for separating the tool-holder bar B2 from the work surface 301 and for joining the tool-holder bar B2 to the work surface 301.

For simplicity, reference is made below to a single replacement device 100 since the replacement devices illustrated substantially correspond with each other.

The replacement device 100 comprises a supporting rod 101 comprising a first and a second end 101 a, 101 b opposite each other along a main direction of extension "X".

The replacement device 100 comprises a plurality of pairs of supporting elements 102a, 102b each of which is constrained to a respective end 101 a, 101 b of the supporting rod 101 and is configured to engage and retain a respective end of the tool-holder bar B1 , B2.

According to the preferred embodiment, each supporting element 102a, 102b has a substantially parallelepiped shape and is provided with a ribbing 104 configured to engage a respective groove made at the ends of the tool-holder bar B1 , B2.

Alternatively, depending on the shape of the ends of the tool-holder bar B1 , B2, each supporting element 102a, 102b has a groove and/or attachment bodies designed to engage and retain the respective toolholder bar B1 , B2.

The supporting rod 101 is movable in rotation about the axis of extension "X" in such a way as to cyclically face a pair of supporting elements 102a, 102b to the press brake 300 aligning it along a direction of insertion or removal "Y" of the tool-holder bar B1 , B2 in the press brake 300.

The supporting rod 101 is movable between an operating position (Figure 2B), wherein it is close to the press brake 300 to allow the above- mentioned pair of supporting elements 102a, 102b facing the press brake 300 to insert or remove the tool-holder bar B1 , B2 in the press brake 300 and a rest position (Figure 2A), wherein it is far from the press brake 300. Preferably, the supporting rod 101 is movable between the operating position and the rest position by means of a translational motion along the direction of insertion or removal "Y" of the tool-holder bar B1 , B2.

Preferably, as shown in Figure 1 B, the supporting rod 101 has at the respective ends 101 a, 101 b brackets 103 configured to engage with movement systems (not illustrated) outside the press brake 300 or forming parts of it for moving the supporting rod 101 between the operating position and the rest position.

In practice, the replacement device 100 may be integrated in the press brake 300 or it may be a separate accessory which can be moved towards the press brake 300 and away from the press brake 300 with external systems.

The systems for moving the replacement device 100 can therefore be integrated in the press brake 300 or different from it.

The replacement system 200 comprises an automatic attachment device 50 operating between the tool-holder bar B1 and the work surface 302 and an automatic attachment device 50 between the tool-holder bar B2 and the work surface 301 .

The automatic attachment devices are denoted with the same reference numeral since they are equal to each other. For simplicity, reference is also made below to a single automatic attachment device 50.

Each automatic attachment device 50 is configured to release or retain the respective tool-holder bar B1 , B2 in the press brake 300.

In particular, one automatic attachment device 50 is configured for retaining or attaching the tool-holder bar B1 to the work surface 302 and for releasing the tool-holder bar B1 from the work surface 302.

The other automatic attachment device 50 is configured to retain or attach the tool-holder bar B2 to the work surface 301 and to release the toolholder bar B2 from the work surface 301 .

Both the automatic attachment devices 50 are configured to interact with the corresponding replacement device 100 to release the tool-holder bar B1 , B2 to be replaced.

Both the automatic attachment devices 50 are configured to interact with the corresponding replacement device 100 attaching the tool-holder bar B1 , B2 which must be used in the press brake 300.

In general, the automatic attachment devices 50 are of the so-called "fast" or "automatic" or "snap-on" type, for example " bayonet-like".

The automatic attachment devices 50 are structured to guarantee the positioning of the respective tool-holder bar B1 , B2 in a predetermined position in the press brake 300 in such a way that the tools U1 , U2 perform the desired operations.

In particular, the automatic attachment devices 50 are structured to guarantee the assembly of the respective tool-holder bar B1 , B2 to the corresponding work surface 302, 301 in such a way that the tools U1 , U2 perform the desired operations.

As illustrated, each automatic attachment device 50 comprises first engagement elements 51 fixed to the respective work surface 301 , 302 and second engagement elements 52 fixed to the corresponding toolholder bar B2, B1 .

The first and second engagement elements 51 and 52 are configured to engage with each other, automatically, when the tool-holder bar B1 , B2 is mounted on the press brake 300 and to disengage, automatically, when the tool-holder bar B1 , B2 is extracted from the press brake 300.

In order to replace the tool-holder bar B1 , B2 the replacement device 100 acts in conjunction with the automatic attachment device 50 in such a way that the tool-holder bar B1 , B2 is disengaged from the work surface 302, 301 , that is to say, that the second engagement elements 52 are disengaged from the first engagement elements 51 .

Once the second engagement elements 52 are disengaged from the first engagement elements 51 the tool-holder bar B1 , B2 is supported and, subsequently, pulled out from the press brake 300 by means of the pair of supporting elements 102a, 102b of the replacement device 100. Similarly, at the moment of the attachment a new tool-holder bar B1 , B2 inside the press brake 300 the replacement device 100 acts in conjunction with the automatic attachment device 50 in such a way that the first engagement elements 51 engage with the second engagement elements 52.

In use, in order to replace the tools mounted in the press brake 300 the tool-holder bars B1 , B2 are replaced together with the respective tools U1 , U2.

A replacement device 100 is prepared wherein the supporting rod 101 is positioned in such a way as to face a pair of empty supporting elements 102a, 102b to the press brake 300 aligning the pair along the direction of insertion or removal "Y" (Figure 2A).

According to an embodiment, the positioning of the supporting rod 101 comprises a rotation of the supporting rod 101 about its own main axis of extension X.

Subsequently, the supporting rod 101 is moved, together with the brackets 103, from the rest position to the operating position and is thus moved close to the press brake 300. In this situation, the pair of supporting elements 102a, 102b, facing the press brake 300, engages the tool-holder bar B1 , B2 attached to the respective work surface 302, 301. Subsequently, the supporting rod 101 passes from the operating position to the rest position in such a way as to remove and withdraw the toolholder bar B1 , B2 from the press brake 300 (Figure 2C).

According to an embodiment, preferably in the rest position, the supporting rod 101 rotates about the axis of extension "X" in such a way as to face a further replacement-holder bar B1 , B2, that is to say, a tool-holder bar B1 , B2 on which are mounted, for example, tools different from those mounted on the tool-holder bar just removed or less worn, supported by a further pair of supporting elements 102a, 102b, to the press brake 300 aligning it along an insertion or removal direction "Y" (Figures 2C and 2D). In this situation, the supporting rod 101 is again moved towards the operating position wherein the replacement tool-holder bar B1 , B2 is inserted in the press brake 300 (Figure 2D).

As described above, the tool-holder bar B1 , B2 is attached to the corresponding work surface 301 , 302.

Following this operation, the press brake 300 can perform the bending operations by using the tools U1 , U2 of the tool-holder bar B1 , B2 just inserted.

By means of the replacement system 200, the tools U1 , U2 of the press brake 300 are replaced in block since the entire tool-holder bar B1 , B2 on which they are mounted is replaced. In other words, thanks to the replacement system 200, the tools U1 , U2 are no longer removed individually from the tool-holder bar B1 , B2 fixed inside the press brake 300 but it is the entire tool-holder bar B1 , B2 to be replaced with a further replacement tool-holder bar B1 , B2, provided with new tools U1 , U2, and attached to the corresponding work surface 301 , 302.

Compared with the prior art solutions, there are no mechanical components interposed between the tool-holder bar and the tools for removing all the tools together, but the tool-holder bar is moved directly.

Advantageously, the possibility of inserting or removing the entire toolholder bar allows the tools to be inserted or removed in block, thus speeding up the operations for replacing the latter.

Advantageously, the possibility of moving the supporting rod 101 towards/away from the press brake 300 and rotating makes it possible to prepare, insert and remove new tools in the press brake 300 in a fast and highly automated manner using the automatic and rapid attachment devices prepared between the tool-holder bars and the press brake.

Advantageously, replacing the entire tool-holder bar automatically guarantees a high level of repeatability.

According to the preferred embodiment, the supporting rod 101 is movable in a rotatable fashion about the axis of extension "X" in such a way as to cyclically face a pair of supporting elements 102a, 102b to a setting-up station wherein the tool-holder bar B1 , B2 engaged in the pair of supporting elements 102a, 102b can be replaced with a replacement toolholder bar B1 , B2.

The setting-up station is therefore accessible to an operator or to an automated machine which, if necessary, replaces the tool-holder bar B1 , B2 engaged in the pair of supporting elements 102a, 102b with a further replacement tool-holder bar B1 , B2 or replacing the individual punches or dies of the tool-holder bar B1 , B2 engaged in the pair of supporting elements 102a, 102b.

The possibility of replacing a tool-holder bar B1 , B2 with another toolholder bar having different tools or a replacement of the individual tools U1 , U2 in the setting-up station allows, whilst the press brake 300 is in operation, new tools U1 , U2 to be set up for subsequent bending operations, further speeding up the entire bending process.

In other words, in order to replace the tools of a press brake 300, at least one replacement system 200, in accordance with the above description, is prepared in such a way that at least one pair of supporting elements 102a, 102b supports a tool-holder bar B1 , B2 and at least one further pair of supporting elements 102a, 102b is free.

The new tools U1 , U2 can be inserted and locked in the tool-holder bar B1 , B2 manually or automatically for subsequent bending operations.

In other words, a press brake 300 and a series of tool-holder bars B1 , B2 can be prepared which are equal to each other, so that all the desired tools U1 , U2 can be inserted and locked in corresponding tool-holder bars. According to a preferred embodiment, the tool-holder bar B1 , B2 is of the type with automatic locking of the tools U1 , U2.

In that case, the replacement system 200 may be configured for automatically inserting and locking the tools U1 , U2 in tool-holder bars B1 , B2 for subsequent bending operations, for example moving the tool-holder bar B1 , B2 into a storage unit in which these tools U1 , U2 are prepared.

Subsequently, the further pair of supporting elements 102a, 102b faces the press brake 300 and the supporting rod 101 is moved to the operating position (Figures 2A and 2B). In this situation, the further pair of supporting elements 102a, 102b engages the tool-holder bar B1 , B2 coupled to the press brake 300 and the supporting rod 101 is moved from the operating position to the rest position removing the tool-holder bar B1 , B2 from the press brake 300 (Figure 2C).

In the rest position, the supporting rod 101 is rotated in such a way as to face the pair of supporting elements 102a, 102b to the press brake 300 (Figure 2C). Subsequently, the supporting rod 101 is again moved from the rest position to the operating position to insert the replacement toolholder bar B1 , B2 in the press brake 300 (Figure 2D).

These steps are repeated every time it is necessary to perform a tool change in the press brake 300.

Advantageously, the operations for replacing the tools of the press brake 300 are efficient and optimised in terms of time.

With reference to the embodiment shown in the accompanying drawings, the replacement device 100 has a first and a second pair of supporting elements 102a, 102b.

The two pairs of supporting elements 102a, 102b are connected to the ends 101 a, 101 b of the supporting rod 101 in such a way as to maintain a fixed reciprocal position. In particular, the two pairs of supporting elements 102a, 102b form between them a flat angle of substantially 180°.

According to this embodiment, in use, in order to replace the tools U1 , U2 located in the press brake 300, the first pair of supporting elements 102a, 102b is empty whilst the second pair of supporting elements 102a, 102b is engaged with a tool-holder bar B1 , B2 equipped with a plurality of tools U1 , U2. In this situation, the supporting rod 101 is rotated in such a way as to face towards the press brake 300 the first pair of empty supporting elements 102a, 102b aligning it along the direction of insertion or removal "Y" (Figure 2A) whilst the second pair of supporting elements 102a, 102b is in the setting-up station. In this situation, the supporting rod 101 is moved to an operating position in such a way that the first pair of empty supporting elements 102a, 102b engages the respective ends of the tool-holder bar B1 , B2 of the press brake 300 (Figure 2B).

Once the tool-holder bar B1 , B2 has been engaged and the automatic attachment devices have been disengaged, the supporting rod 101 is moved from the operating position to the rest position. During this movement, the first pair of supporting elements 102a, 102b engaged with the tool-holder bar B1 , B2 located in the press brake 300 withdraws the tool-holder bar B1 , B2 from the press brake 300 (Figure 2C) disengaging the second engagement elements 52 from the first engagement elements 51 and consequently removing in block all the tools mounted on it.

In the rest position, the supporting rod 101 rotates about the axis of extension "X" in such a way as to face the tool-holder bar B1 , B2 engaged with the second pair of supporting elements 102a, 102b to the press brake 300 and in such a way as to bring the first pair of supporting elements 102a, 102b, engaged with the tool-holder bar B1 , B2 just picked up by the press brake 300, in the setting-up station (Figure 2C).

In this situation, the supporting rod 101 is again moved to the operating position to attach the new tool-holder bar B1 , B2, and therefore the set of new tools U1 , U2 mounted on it, in the press brake 300 (Figure 2D).

Once the new tool-holder bar B1 , B2 has been released in the press brake 300 with the second engagement elements 52 engaged with the first engagement elements 51 , the supporting rod 101 is returned to the rest position. In this situation, whilst the press brake 300 operates using the tools U1 , U2 of the tool-holder bar B1 , B2 just attached, the replacement device 100 has the second pair of empty supporting elements 102a, 102b facing the press brake 300, since they have just released the respective tool-holder bar B1 , B2, and the first pair of supporting elements 102a, 102b, engaged with the tool-holder bar B1 , B2 which has been removed firstly by the press brake 300, located in the setting-up station. In this situation, the first pair of supporting elements 102a, 102b is in the setting-up station in such a way that, during the operation of the press brake 300, an operator or an automated means can, if necessary, replace the tool-holder bar B1 , B2 with a further replacement tool-holder bar B1 , B2 necessary for the press brake 300 for the subsequent bending operations or replace only some tools U1 , U2 of the tool-holder bar B1 , B2, for example, in the case of failure of some of them.

Advantageously, the replacement system 200 prevents stoppages of the press brake 300 each time it is necessary to change the machining tool.

Advantageously, the replacement system 200 allows a replacement in block of the tools U1 , U2, since it is the entire tool-holder bar B1 , B2, on which they are mounted, to be inserted or withdrawn from the press brake 300.

As shown in the embodiment in the accompanying drawings, the first replacement device 100 is located close to the upper part of the press brake 300 in such a way as to act on it to replace the tool-holder bar B1 relative to the punches U1 whilst, the second replacement device 100 is located close to the lower part of the press brake 300 in such a way as to act on it to replace the tool-holder bar B2 relative to the dies U2.

Preferably, the first and second replacement devices 100 are mutually facing and aligned along an alignment direction “Z” parallel to a direction of movement of the punches of the press brake 300.

Even more preferably, as shown by the arrows in the accompanying drawings, the supporting rods 101 of the first and second replacement devices 100 are movable in a synchronised fashion to perform a simultaneous replacement of the tool-holder bar B1 relative to the punches U1 and of the tool-holder bar B2 relative to the dies U2 in the press brake 300.

Advantageously, the possibility of simultaneously replacing the punches U1 and the dies U2 of the tool-holder bars B1 , B2 allows tool changing operations to be further speeded up and thus making the press brake 300 even more productive.

Advantageously, the above-mentioned replacement system 200 may be applied as a retro-fitting to an existing press brake 300.

In this situation, the prior art elements designed to support the tool-holder bars B1 , B2 in the press brake 300 are replaced with the first and second engagement elements 51 , 52 in such a way as to engage and disengage the bar automatically as necessary.

The first and second engagement elements 51 , 52 are mounted, respectively, on the work surfaces 301 , 302 and on the tool-holder bars B1 , B2 in such a way as to be able to act in conjunction, during the replacement of the tool-holder bars B1 , B2, with the pairs of supporting elements 102a and 102b of the first and/or the second replacement device 100.

Alternatively, the replacement system 200 may be constructed integrally with a press brake 300. In this situation, the press brake 300 comprises, for example, a replacement system 200, as described above, and a fixed work surface 301 and comprising the engagement elements 51 configured to engage and retain the corresponding engagement elements 52 provided in the tool-holder bar B2.

The press brake 300 comprises a work surface 302 movable towards and away from the surface 301 and comprising the engagement elements 51 configured to engage the engagement elements 52 provided in the toolholder bar B1 .

In other words, in the case of a press brake 300 produced integrally with the replacement system 200, the pairs of supporting elements 102a, 102b of the first and second replacement devices 100 are configured for operating in conjunction with the automatic attachment devices 50 of the tool-holder bars B1 , B2 of the press brake 300 in such a way as to actuate them for locking the tool-holder bar B1 , B2 entering the press brake 300 and/or for releasing the tool-holder bar B1 , B2 at the outfeed to the press brake 300. Advantageously, the press brake 300 equipped with the integrated replacement system 200 allows the operations for replacing the tool-holder bars B1 , B2 to be made even more efficient since there is no need to replace the known elements designed to attach the tool-holder bars B1 , B2 of the press brake 300 with the automatic attachment device 50 forming part of the replacement system 200.

The invention achieves the preset aims overcoming the drawbacks of the prior art.

In particular, the invention allows the tools of a press brake 300 to be replaced in a fast and efficient manner.

The invention makes it possible to speed up and facilitate the operations for replacing the tools of the press brake 300 without the need to stop the press brake for long periods.