Patent Description:
In this older patent two variants of the known bending tool are shown, an upper tool and a lower tool. The known upper tool comprises an upward directed mounting part configured for clamped suspension in an upper beam of a bending apparatus, such as a press brake. The upper tool further has a downward directed shaping part in the form of a bending edge. The known lower tool has a downward directed mounting part configured for placing and, if desired, clamping in a lower beam of the apparatus. In addition, it has an upward directed shaping part which co-acts with the downward directed shaping part of the upper tool. This shaping part takes the form of a groove into which the bending edge can be pressed. The positions of the upper tool and lower tool can otherwise also be switched so that the bending edge is pressed into the groove from the underside.

The tool as described in this older patent is used mainly to shape relatively thin plate material with a maximum plate thickness of <NUM>. The tool can then also take a relatively small and light form and can be handled by a user without a great deal of effort. When a tool has to be replaced, the user can place the tool in or remove it from the apparatus manually.

Larger and heavier tools are however required for shaping greater plate thicknesses. Tools suitable for bending plate thicknesses of for instance <NUM> thus weigh in the order of <NUM> per metre of length. Although considerably shorter tools are often applied, weights of between <NUM> and <NUM> are then still no exception. Such tools can no longer be handled properly by a user. Different systems have therefore already been proposed for placing heavy tools in or removing them from an apparatus.

The Japanese patent publication <CIT> thus describes an upper beam for attaching in an apparatus a tool in which is formed a receiving space of cross-shaped cross-section. The receiving space is formed by a vertically running main space and two side spaces on either side of the main space. In this older system the tool is mounted on a slide with a vertical part extending in the main space and two horizontally protruding parts extending in the side spaces. Arranged in the bottoms of the two side spaces are rollers over which the horizontal parts of the slide can travel. A slide with a tool mounted thereon can in this way be carried from the side into the upper beam.

In another known system which is described in the American patent <CIT> a lower beam of an apparatus is provided with rollers in the bottom of the receiving space for the tool. These rollers can be moved upward until they protrude above the bottom surface, following which a tool can be moved thereover.

In prior art document <CIT> a device for securing a punch tool to a ram portion of a press brake is described which includes an upper portion having opposing front and back outer recesses extending longitudinally from a first end wall to a second end wall. The outer recesses are configured to snugly receive a corresponding inner wall protuberance of a clamp portion of the ram portion of the press brake as the upper portion is grasped and "squeezed" by the ram portion during operation of the press brake. The device and the punch tool attached thereto, are supported by the protuberance. A lower portion of the device includes an inner recess that snugly receives a corresponding upper portion of the punch tool. The upper portion of the punch tool is removably secured to the lower portion of the device, which is said to promote the quick substitution of punch tools having varying lower portion configurations and identical upper portion configurations.

Prior art document <CIT>, on which the preamble of claim <NUM> is based, discloses a die exchanging device for a press brake including a lower die which is arranged in a die holder that is movable in longitudinal direction on a table. The die holder has rollers which run on auxiliary rails that are movably arranged in the table. The auxiliary rails are urged upwards to be flush with the table, and are pressed down by the rollers when the die holder is clamped on the table.

The known constructions have the drawback that they are relatively large and complicated. The beam is moreover weakened at the position of the recesses in which the rollers have to be bearing-mounted, this entailing the risk of local deformation of the clamping beams. This could in turn result in a non-uniform shaping of the material.

The invention therefore has for its object to provide a solution for the problems outlined above. This is achieved according to the invention by providing a tool as defined in claim <NUM>. Preferred embodiments of the tool are described in dependent claims <NUM>-<NUM>.

The invention further relates to a combination of an apparatus, in particular a press brake, and a tool of the type described above. The invention provides a combination as defined in claim <NUM>. Preferred embodiments of this combination are described in dependent claims <NUM> and <NUM>.

And finally, the invention relates to a set of tools which comprises a first tool of the type described above and a second tool. The set of first and second tools has the features defined in claim <NUM>. Further embodiments of this set of tools are described in dependent claims <NUM>-<NUM>.

The invention will now be elucidated on the basis of a number of embodiments, wherein reference is made to the accompanying drawing in which corresponding components are designated with reference numerals increased in each case by <NUM>, and in which:.

In an apparatus (not shown here) for shaping a material, in particular for bending plate material, use is made of an upper tool <NUM> (<FIG>) and a lower tool <NUM> (<FIG>). Upper tool <NUM> is attached here in an upper clamping beam <NUM> which is in turn mounted on a (schematically shown) upper frame <NUM> of the apparatus, while lower tool <NUM> is received in a lower clamping beam <NUM> which is likewise mounted on a lower frame <NUM> of the apparatus. Upper and lower clamping beams <NUM>, <NUM> can otherwise also form an integral part of respectively upper frame <NUM> and lower frame <NUM>. The apparatus, which is also known as a press brake, is provided with a drive whereby the upper and lower frames <NUM>, <NUM> with the upper and lower clamping beams <NUM>, <NUM> mounted thereon can be moved toward each other with force in order to bend a piece of plate material placed between lower tool <NUM> and upper tool <NUM> to a desired angle. Lower frame <NUM> with lower beam <NUM> and lower tool <NUM> will in many cases be held in place here, and upper frame <NUM> with upper beam <NUM> and upper tool <NUM> will be moved downward.

Upper tool <NUM> comprises a mounting part <NUM> configured to be received in a receiving space <NUM> of upper beam <NUM> (<FIG>). This receiving space <NUM> takes the form of an elongate recess or groove extending over the whole length of upper beam <NUM>. In addition, the tool comprises a shaping part <NUM> extending in the direction of the lower beam from mounting part <NUM>. This shaping part <NUM> has a roughly C-shaped cross-section here and ends in a bending edge <NUM>. Tool <NUM> has two shoulders <NUM> on either side of mounting part <NUM> which during use come into engagement with support surfaces <NUM> on the underside of upper beam <NUM> so as to transmit the pressure forces in evenly distributed manner into tool <NUM>.

In the shown embodiment lower tool <NUM> comprises two mounting parts <NUM> configured to be received in a receiving space <NUM> in lower beam <NUM> of the apparatus (<FIG>). This receiving space <NUM> is also an elongate recess or groove and extends over the length of lower beam <NUM>. Lower tool <NUM> additionally comprises a shaping part <NUM> provided in the shown embodiment with a substantially V-shaped groove <NUM> directed toward upper tool <NUM>. Lower tool <NUM> further has two shoulders <NUM> extending on either side of a groove <NUM> in which the mounting parts <NUM> are fixed. During use of the apparatus and the tool these shoulders <NUM> rest on support surfaces <NUM> of lower beam <NUM> of the apparatus. Just as upper tool <NUM>, lower tool <NUM> could also have a mounting part formed integrally with the rest of the tool.

The apparatus and tools <NUM>, <NUM> are particularly intended for the purpose of shaping relatively thick metal plate with a material thickness in the order of <NUM> or more. This results in tools <NUM>, <NUM> taking a relatively large and heavy form. Tools which are suitable for bending such thick metal plates often weigh in the order of <NUM> per running metre. These bending tools are generally supplied in different length sizes for the purpose of shaping materials with varying dimensions. A plurality of tools can for instance be placed adjacently of each other here in the press brake. However, even relatively short tools of for instance <NUM> already have a weight of about <NUM> and cannot therefore be handled by a user without auxiliary means.

The invention therefore provides displacing means with which tools <NUM>, <NUM> can be displaced in the respective receiving spaces <NUM>, <NUM>. The displacement is envisaged here in the longitudinal direction of receiving spaces <NUM>, <NUM>, so parallel to the bending edge <NUM> and groove <NUM> of tools <NUM>, <NUM>. In the shown embodiment the displacing means comprise displacing members <NUM>, <NUM> protruding from the mounting part <NUM>, <NUM> of the associated upper or lower tool <NUM>, <NUM>. In the shown embodiment these displacing members <NUM>, <NUM> are each mounted rotatably in the corresponding mounting part <NUM>, <NUM> and thus form rollers or wheels which engage on a wall part <NUM>, <NUM> in the associated receiving space <NUM>, <NUM>.

Displacing members <NUM> of upper tool <NUM> are formed here by the outer ends of a rod <NUM> which is received in a through-bore <NUM> in mounting part <NUM> (<FIG>). These outer ends <NUM> protrude outside side walls <NUM> of the mounting part. Arranged around a middle part of rod <NUM> is a bearing <NUM> which is retained by a flange <NUM> of rod <NUM>. Flange <NUM> is in turn retained by a ring <NUM> which is pressed into a groove <NUM>. Bore <NUM> has a narrowed portion <NUM> in which rod <NUM> is rotatable in closely-fitting manner. The bore is sealed by a gasket ring <NUM>.

In the shown embodiment upper tool <NUM> is provided with two sets of displacing members <NUM> arranged close to the outer ends (<FIG>).

As stated, displacing members <NUM> protrude outside side walls <NUM> of mounting part <NUM> of upper tool <NUM>, between shoulders <NUM> and recesses <NUM> to be discussed below. In order to accommodate these displacing members <NUM> the receiving space <NUM> is provided with two side chambers <NUM>, likewise extending over the length of upper beam <NUM>. When tool <NUM> has to be displaced in upper beam <NUM>, displacing members <NUM> move over bottoms <NUM> of side chambers <NUM> on either side of main recess <NUM>. The height of side chambers <NUM> is greater than the diameter of displacing members <NUM>, while the depth of side chambers <NUM> is greater than the distance the displacing members <NUM> protrude from side walls <NUM> of mounting part <NUM>. There is thus sufficient space to hold displacing members <NUM> clear of bottom <NUM> when tool <NUM> is used to perform a bending operation. This prevents displacing members <NUM>, which are relatively vulnerable, being loaded during this operation.

When tool <NUM> has been moved to a desired position in longitudinal direction of upper beam <NUM>, tool <NUM> is fixed in the upper beam. Use is made for this purpose of a per se known clamping mechanism arranged in upper beam <NUM>. Mounting part <NUM> of tool <NUM> is provided on either side with a recess <NUM> with inclining surfaces into which a clamping member <NUM> of the apparatus engages. When clamping member <NUM> protrudes into recess <NUM> in one of the side walls <NUM>, it presses mounting part <NUM> obliquely upward in receiving space <NUM> (<FIG>). Mounting part <NUM> is pressed so far to the side that it comes to lie against a wall of recess <NUM>. The opposite side wall <NUM> of mounting part <NUM> can here touch a side wall of recess <NUM>, or the upper side of the mounting part can come into contact with the upper wall of recess <NUM>. In this situation mounting part <NUM> is pressed so far upward that displacing members <NUM> have moved clear of wall part <NUM>, although not so far that they could come into contact with any other wall of side chambers <NUM>. Displacing members <NUM> are thus not loaded.

As noted, lower tool <NUM> has two mounting parts <NUM> arranged spaced apart in longitudinal direction. In the shown embodiment the mounting parts <NUM> are connected releasably to shaping part <NUM> by means of bolts <NUM> running through holes <NUM>. Each mounting part <NUM> is provided here with two displacing members <NUM> which are likewise arranged spaced apart in longitudinal direction. Each displacing member <NUM> takes the form of a roller arranged rotatably on a shaft <NUM> via a bearing <NUM>. Displacing members <NUM> are received in recesses <NUM> in mounting part <NUM> and each protrude to some extent below the bottom surface <NUM> thereof.

When tool <NUM> has to be displaced in lower beam <NUM>, displacing members <NUM> move over the bottom <NUM> of recess <NUM>. In order to prevent displacing members <NUM> being loaded when lower tool <NUM> is clamped in lower beam <NUM> and is used to deform plate material, bottom <NUM> of recess <NUM> is movable such that it comes to lie clear of displacing members <NUM>.

In the shown embodiment the movable bottom <NUM> rests via a coupling part <NUM> on a sealing strip <NUM> functioning as piston. This sealing strip <NUM> is accommodated movably in an opening <NUM> in the upper side of an elongate pneumatic reservoir <NUM> which is arranged in a recess <NUM> in lower beam <NUM>. The movement of sealing strip <NUM> is bounded by the dimensions of another recess <NUM> in lower beam <NUM>. Activation of a pneumatic system enables pressure to be applied to reservoir <NUM>, whereby sealing strip <NUM> is urged upward and bottom <NUM> is moved upward until it comes into engagement with displacing members <NUM> (<FIG>, <FIG>). If on the other hand the pressure is removed from reservoir <NUM>, sealing strip <NUM> then drops back into opening <NUM> under the influence of the weight of bottom <NUM> and coupling part <NUM>. Movable bottom <NUM> hereby drops until it comes to rest on an outer edge <NUM> of receiving space <NUM>. In this position the displacing members <NUM> lie clear of bottom <NUM> (<FIG>, <FIG>). Bottom <NUM> could otherwise also be movable hydraulically, or even mechanically, instead of pneumatically.

The above described upper tool <NUM> is of the type known as a "Wila style" tool, the protruding mounting part <NUM> of which has a specific form which ensures that the tool can be positioned and clamped quickly and easily. The invention can however also be applied in other types of tool.

<FIG> thus shows a so-called "American style" upper tool <NUM>, the mounting part <NUM> of which is provided close to its free outer end with displacing members <NUM> protruding from side walls <NUM>. These displacing members <NUM> are received here in two side chambers <NUM> of the T-shaped receiving space <NUM> in upper beam <NUM> and are moved over the bottoms <NUM> of these side chambers <NUM> when tool <NUM> has to be positioned. In the shown position tool <NUM> is otherwise clamped in upper beam <NUM>, wherein shoulders <NUM> lie against support surfaces <NUM> and displacing members <NUM> lie clear of the walls of side chambers <NUM>.

In a variant of this "American style" upper tool <NUM> a rod <NUM> protrudes from an end surface <NUM> of mounting part <NUM> (<FIG>). This rod <NUM> is provided with a bore <NUM> in which a shaft <NUM> is mounted. Mounted on the outer ends of this shaft <NUM> are two displacing members <NUM> which can in turn be moved through side chambers <NUM> of the T-shaped receiving space <NUM>. It would also be possible in this variant to suffice with a single displacing member <NUM> on a side of rod <NUM>.

<FIG> shows a "European style" upper tool <NUM> which is clamped in a receiving space <NUM> defined by an upper beam <NUM> with a narrowed underside and a separate clamping member <NUM>. This upper tool is also provided with displacing members <NUM> on either side of mounting part <NUM>, only one of which however protrudes outside side surface <NUM>. The other displacing member <NUM> only lies clear on its underside, and thereby rolls over bottom <NUM> of a side chamber <NUM> formed in clamping member <NUM>. Displacing members <NUM> are here also formed by the outer ends of a rod <NUM> which protrudes through a bore <NUM> in mounting part <NUM> and is mounted in a bearing <NUM>.

In yet another embodiment of upper tool <NUM> the mounting part <NUM> is provided with two types of displacing member 318A, 318B protruding on mutually opposite sides from side walls <NUM> (<FIG>). Displacing members 318A, two of which are shown here, are each rotatable here about an axis A extending transversely of shaping direction W, so in the shown embodiment horizontally. The single displacing member 318B is on the other hand pivotable about an axis B extending in the shaping direction W of tool <NUM>, so in the shown embodiment a vertical axis.

The two displacing members 318A are arranged here between groove <NUM> and the "shoulder" <NUM> of tool <NUM>, while the single displacing member 318B is placed close to end surface <NUM> of mounting part <NUM>. In this embodiment of upper tool <NUM>, which is referred to as "head-supporting", the "shoulders" <NUM> do not engage with lower surfaces <NUM> of upper beam <NUM> during the clamping. Tool <NUM> instead supports in the clamped situation with its end surface <NUM> against an upper surface <NUM> of receiving space <NUM>. Displacing members 318A are once again received in two through-bores <NUM> and mounting part <NUM>, while the single displacing member 318B is received in an elongate recess <NUM> in mounting part <NUM>. This displacing member 318B is rotatable around a shaft stub <NUM> placed in a bore <NUM> in the end surface of mounting part <NUM>.

The two displacing members 318A rotatable about horizontal axes A are again intended to roll over bottom <NUM> of a side chamber <NUM> of receiving space <NUM>. Displacing member 318B rotatable about vertical axis B is on the other hand intended to roll along a side wall <NUM> of receiving space <NUM> (<FIG>). This arrangement of the displacing members is advantageous, since the centre of gravity of tool <NUM>, which is also referred to as a "tub tool", lies in the shown embodiment quite far out of the line of mounting part <NUM>. This is a result of the convex form of shaping part <NUM>. Placing of the displacing member 318B rotatable about the vertical axis B and supporting against side wall <NUM> of receiving space <NUM> compensates the moment resulting from the eccentric location of the centre of gravity. Because this displacing member 318B can moreover be larger than displacing members 318A, which are received in the relatively small side chambers <NUM>, the force exerted on displacing member 318B is relatively small, whereby the friction also remains limited.

This variant, wherein two different types of displacing member are combined, could also be readily applied in tools with other types of clamping, such as for instance the "European style" upper tool <NUM> as shown in <FIG>. One of the two (partially) protruding displacing members <NUM> could then be replaced here by a displacing member which protrudes outside one of the side surfaces <NUM> and is rotatable about a vertical axis.

In yet another variant of this embodiment shown in <FIG> the displacing members 418A rotatable about horizontal axes A are retractable into mounting part <NUM>. Each displacing member 418A is for this purpose mounted rotatably via bearing <NUM> in a slide <NUM>, which is in turn mounted slidably in a recess <NUM> extending in both mounting part <NUM> and, partially, in shoulder <NUM>. Each slide <NUM> comprises an upper part <NUM> which supports bearing <NUM> and displacing member 418A, a middle part connected to a guide member <NUM> and a lower part <NUM> protruding outside the tool and functioning as operating member or pushbutton.

Guide member <NUM> has a narrow shank which protrudes through an opening <NUM> and a widened head which cannot pass through this opening and functions as stop. This widened head is slidable in a bore <NUM> lying opposite recess <NUM>. Slide <NUM> with displacing member 418A is biased to its protruding position by means of a biasing member <NUM> received in a chamber <NUM>.

Pressing operating member <NUM> (<FIG>) presses slide <NUM> into recess <NUM> counter to the force of biasing member <NUM>, whereby displacing member 418A comes to lie within the periphery of mounting part <NUM>. In this position the mounting part <NUM> can be inserted into the receiving space (not shown here) of the apparatus. When operating member <NUM> is then released, slide <NUM> is pressed outward again by biasing member <NUM> (<FIG>), whereby displacing member 418A once again engages in the side chamber of the receiving space in the above described manner.

Displacing member 418A thus functions simultaneously as safety catch which prevents tool <NUM> from unintentionally falling out of the apparatus when the clamping is released. In order to remove tool <NUM> from recess <NUM> the operating member <NUM> has to be pressed once again, whereby the associated displacing member 418A is retracted again into mounting part <NUM>.

It has been stated above that for displacement of the lower tool in the lower beam use can be made of displacing members protruding from the end surface of the mounting parts and rolling over a bottom of a recess in the lower beam. So as not to load these displacing members when the lower tool is used for the purpose of shaping plate material, these members must come to lie clear of the bottom of the recess following the displacement. According to an alternative embodiment of lower tool <NUM>, the mounting parts <NUM> in which displacing members <NUM> are mounted are for this purpose movable in the shaping direction relative to the rest of lower tool <NUM> (<FIG>).

Mounting part <NUM> is slidable in the shaping direction in groove <NUM> on the underside of lower tool <NUM>. Formed in shaping part <NUM> of tool <NUM> is a bore <NUM> which extends from the bottom <NUM> of V-shaped groove <NUM> to groove <NUM>. Received in this bore <NUM> is a control pin <NUM> with a head <NUM> on which a tool, for instance a socket wrench or a screwdriver, can engage and which has a narrowed threaded end <NUM>. This threaded end <NUM> protrudes into hole <NUM> in mounting part <NUM> which is provided with internal screw thread. Mounting part <NUM> and shaping part <NUM> are further also provided with blind bores <NUM>, <NUM> which lie mutually in line and in which a guide pin <NUM> is received.

By rotating the control pin <NUM> the mounting part <NUM> is pressed further out of groove <NUM> relative to shaping part <NUM> or, conversely, retracted therein again. Displacing members <NUM> can hereby as desired be brought into engagement with the bottom of the recess of the lower clamping beam (not shown here) or, conversely, be held clear thereof again.

Because it is not always readily possible in practice, and moreover unsafe, to perform operations with a screwdriver or socket wrench in a hole in the bottom <NUM> of V-shaped groove <NUM>, an alternative embodiment of lower tool <NUM> is provided with an operating mechanism which is accessible from the side of the tool (<FIG>).

In this embodiment two stepped bores <NUM> are formed in each mounting part <NUM> which lie in line with blind bores <NUM> in shaping part <NUM> of lower tool <NUM>. Arranged in these bores are guide pins <NUM> which are screwed with their threaded ends into bores <NUM>. These guide pins <NUM> have a thickened head which is movable through the widened part of bore <NUM> and which encloses a biasing member <NUM>, for instance a helical spring. A bore <NUM> in which a control pin <NUM> is slidably received is further formed in shaping part <NUM> between bores <NUM>. An outer end of this control pin <NUM> engages on the upper side of mounting part <NUM> while the other outer end is in engagement with a narrowed and eccentric middle part <NUM> of a horizontal operating rod <NUM>.

This rod <NUM> is received in a bore <NUM> extending from the one side to the other of lower tool <NUM> and provided on either side with a head <NUM> on which a tool such as a socket wrench or screwdriver can engage. Rotation of operating rod <NUM> displaces the narrowed and eccentric middle part <NUM> in bore <NUM>, whereby pin <NUM> is pressed out of lower tool <NUM> or, conversely, space is created to retract this pin <NUM> into the lower tool. This retracting movement takes place under the influence of biasing members <NUM> as soon as operating rod <NUM> is rotated so far that space is created for pin <NUM> to move upward in bore <NUM>. Displacing members <NUM> are in this way once again brought into contact with the bottom of the recess in the lower beam or held clear thereof as desired.

A pneumatic or a hydraulic operation could of course also be envisaged instead of the mechanical operation shown and described here for extending and retracting the displacing members.

Although in the embodiments of the upper tool shown up to this point the displacing members have been bearing-mounted in the mounting part, this is not essential. In an alternative embodiment of upper tool <NUM> the mounting part <NUM> can thus be provided with one or more protruding displacing members 718A, while one or more displacing members 718B are additionally arranged on shaping part <NUM> of tool <NUM> (<FIG>).

Where displacing members 718A, which are bearing-mounted in mounting part <NUM>, once again engage in side chambers <NUM> of receiving space <NUM> of upper beam <NUM> of the apparatus, displacing members 718B engage on support surface <NUM> on the underside of upper beam <NUM>. As in previous embodiments, these outer displacing members 718B, which can take a considerably larger form than the internal displacing members 718A, serve to compensate the moment occurring as a result of the eccentric location of the centre of gravity of tool <NUM>. The external displacing members 718B are thus arranged for this purpose on the other side of tool <NUM>, opposite the internal displacing members 718A, which in fact define rotation points when tool <NUM> is placed in receiving space <NUM> of upper beam <NUM>. Each external displacing member 718B comprises a relatively large roller <NUM> which is rotatable about a strong shaft <NUM>.

The external displacing member 818B can also be received in a protruding part <NUM> of upper tool <NUM>. This member is hereby better protected from ambient influences, whereby a smooth running with little friction is guaranteed under any conditions.

A similar solution could also be used in a lower tool, where one or more displacing members could be arranged in the shoulder(s) adjacently of the protruding mounting part, or even on the sides of the tool.

The invention thus makes it possible with relatively simple means to clamp large and heavy tools, which are used to shape relatively thick metal plate, at a desired position in an apparatus or to remove them therefrom.

Although the invention has been elucidated above on the basis of different embodiments, it will be apparent that it is not limited thereto. Depending on the dimensions and the weight of the tool, a greater or smaller number of displacing members could thus be applied than shown and described here. It is further possible to envisage use being made, instead of rolling displacing members, of displacing members which slide through or along the upper and lower beam. The displacing members and/or the receiving spaces and/or the outer surfaces of the upper and lower beam would have to be covered for this purpose with a material with exceptionally low sliding resistance, such as for instance PTFE.

Claim 1:
Tool (<NUM>; <NUM>) for shaping a material, in particular for bending plate material, comprising:
- a mounting part (<NUM>; <NUM>) directed in a first direction, the first direction corresponding to the shaping direction, and configured to be at least partially received in a receiving space (<NUM>) of an apparatus,
- a shaping part (<NUM>; <NUM>) extending from the mounting part (<NUM>; <NUM>) in a second direction opposite the first direction, wherein the shaping part (<NUM>; <NUM>) has a substantially V-shaped groove (<NUM>; <NUM>), and
- means for displacing the mounting part (<NUM>; <NUM>) in longitudinal direction parallel to the groove (<NUM>; <NUM>) through the receiving space (<NUM>), wherein the displacing means comprise at least one displacing member (<NUM>; <NUM>) protruding from the mounting part (<NUM>; <NUM>) of the tool (<NUM>; <NUM>),
wherein the at least one displacing member (<NUM>; <NUM>) is mounted rotatably in the tool (<NUM>; <NUM>), and comprise a roller arranged rotatably on a shaft (<NUM>; <NUM>) via an internal bearing (<NUM>; <NUM>),
characterized in that
the mounting part (<NUM>; <NUM>) has an end surface (<NUM>) where the at least one displacing member (<NUM>; <NUM>) protrudes, and wherein the at least one displacing member (<NUM>; <NUM>) is movable in the first direction relative to the tool (<NUM>; <NUM>).