FR2774316A1 - Workpiece variable code marker - Google Patents

Abstract

The code marker for a workpiece manufacturing machine with two sections (100, 200) surrounding the workpiece, comprises a support (410) carrying the code symbols which are pressed against the workpiece when the two sections are closed. The upper section (100) has a passage (140) which extends from the marking zone (130) to a constantly accessible zone regardless of whether the machine sections are open or closed, with the support (410) able to slide along the passage between the two zones. The support can be attached to a rod which extends between the two zones for adjusting the position of the marker.

Description

 The present invention relates to the field of devices for the production of stamped parts or intended to be stamped.

 In known manner, most of the stamped parts used in the composition of a motor vehicle have a marking making it possible to carry out compliance searches for stages which take place downstream of a production chain, for example during stages. of shoeing, painting or mounting these parts.

 These markings are usually made cold, for example using a support bearing raised characters, pressed against the stamped part or to be stamped so that the raised letters sink into the material of which this piece is made and that a tracking code remains printed on the part.

 In known manner, such marking is carried out simultaneously with another stage of transformation of the part. The marking support is placed in a machine carrying out this transformation step, and more precisely in a machine having elements intended to grip the part. The support is placed on one of the elements intended to enclose the part, so that the support is placed on the part when the machine encloses the part. Thus, it is not necessary to provide a specific step of marking the part.

 In an auto parts manufacturing plant, the codes for stamping stamped parts change frequently. Thus, with each evolution of a stamped part, with each change of operating mode to make this part, it is necessary to change the code.

 These changes are made during manufacturing or outside manufacturing.

 A change of marking code during manufacture is, for example, necessary after each intervention by a maintenance service, or even when the parts produced are pre-series or lead parts.

 We must also change the codes during manufacture when changing the constituent material for stamped parts, for example when comparing economical materials and high quality materials.

 It is also desirable in the automotive industry to change the marking code each time a sheet metal coil is changed from which the parts are made, in particular when the stamped parts are safety, regulatory or even parts visible on the vehicle.

 Regarding code changes outside of manufacturing, they are made with each change in a part plan or a manufacturing method plan. The non-manufacturing codes are also changed after each intervention on the tool, whether this intervention is a repair intervention or an intervention aimed at improving the quality of the parts produced. We also change non-manufacturing codes during each preventive visit to the tool.

 There is shown in Figure 1 a stamping tool mounted on a press according to the prior art. This tool consists of two parts, a movable upper part 100, and a stationary lower part or press plate 200.

 In known manner, this tool is intended to receive a sheet to be stamped between the parts 100 and 200.

 The upper part of the tool 100 has a concave surface 110 which is complementary and vis-à-vis with a convex surface 120 of the lower part 200. The upper part 100 is movable in approach to the plate 200 so that the surface 110 comes to close in a complementary manner on the surface 120. The sheet is then sandwiched between these two surfaces 110 and 120.

 When these two surfaces are closed against each other, it is said that the tool is closed. Conversely, when the surfaces 110 and 120 are kept separate, it is said that the tool is open.

 The surface 110, in its central part, a cavity 115, at the bottom of which is placed a letter holder 300.

 The letter carrier 300 is shown in more detail in FIG. 2. It has, in known manner, a receptacle 320 capable of holding one next to the other studs 330 which each carry, on a lower surface, a letter in relief also called letter to hit.

 The letter holder 300 has a sufficient thickness so that, when the stamping sheet is sandwiched between the surfaces 110 and 120, these raised letters are inserted into the sheet.

 On such a tool conforming to the state of the art, a change of marking code requires several handling steps.

 The manufacturing tool, i.e. the press in the case described here, must first be kept open. An operator must then engage an arm or the body between the upper part 100 and the lower part 200 to dismantle the letter carrier 300.

Such human intervention between two elements capable of closing against each other is particularly dangerous, which requires several prior safety operations, especially when this intervention takes place during manufacture.
Thus, manual access to surface 110 is only possible after having stopped a press cycle, caused a complete shutdown of any press flywheel, cut off a press motor from any electrical supply and set up a safety block 400, also known by the English name of safety block, between the upper 100 and lower 200 parts.

 Once these procedures have been carried out, an operator separates the letter holder 300 from the bottom of the cavity 115, opens this letter holder 300, changes the studs 330, then reassembles the letter holder in its place on the surface 110.

 Such an intervention usually takes 6 minutes.

 During this period, the press is immobilized and also a whole production line of which the press is a part.

 Furthermore, the operator's working conditions to make this code change are therefore particularly difficult. Indeed, to access the letter carrier 300,1 the operator must adopt a particularly uncomfortable body position and, moreover, work with arms raised.

 As mentioned earlier, a second possibility is to change the letter holder outside of production. During such an intervention, the tool is disassembled. In the example described here of a stamping tool, the upper 200 and lower 100 parts are separated from one another.

 More specifically, this operation includes the following steps.

The tool must first be handled to a specialized work area.

In this work area, the upper part 100 of the tool is detached from the lower part 200, the letter holder 300 is changed, the tool is closed, and finally the tool is transported to the storage or storage area. manufacturing. Such an intervention takes an average duration of four hours.

 The main object of the present invention is to provide a device comprising a means of marking such a part, and allowing a particularly easy and particularly rapid change of the marking code.

 Another object of the present invention is to provide such a device in which the marking means can be changed from an area which cannot be sandwiched between two elements of the tool, and therefore safer.

 These various aims are achieved according to the invention thanks to a device comprising elements capable of closing on a part, a support carrying a marking code detachably placed on one of these elements in a marking location suitable for the support comes to bear against the part when the elements close on the part, and having a passage extending from the marking location to a part of the device which is constantly accessible whatever the state of opening or closing of the device, the support being adapted to slide in the passage between the constantly accessible part and the marking location.

Other characteristics, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of nonlimiting examples and in which
- Figure 1 shows a stamping tool according to the state of the art;
- Figure 2 shows a letter holder according to the state of the art;
- Figure 3 shows a tool according to the invention, in which two elements capable of enclosing a sheet metal part are pressed against each other;
- Figure 4 shows a marking key according to the invention;
- Figure 5 is a side view of a sliding channel for a marking key, according to the invention;
- Figure 6 is a cross-sectional view of the channel of Figure 5, along a section plane VI-VI shown in Figure 5, in which channel is engaged a marking key according to the invention;
- Figure 7 is a front view of a retaining block of a marking key, according to the invention;
- Figure 8 shows, in vertical longitudinal section, an end portion of a key passage, comprising a rotation cavity according to the present invention
- Figure 9 shows a same section of the same part of a key passage, into which is introduced a marking support according to the present invention, the support being in a horizontal position
- Figure 10 shows the same elements as in Figure 9 in a vertical position of the marking support through the rotation cavity;
- Figure 1 1 shows the same elements as in Figure 10, in a position where the marking support is engaged in an end cavity for locking in rotation;
- Figure 12 is a cross section of a cavity adapted to receive one end of a rod and a blocking base, according to the present invention.

 There is shown in Figure 3 a stamping tool according to the present invention. It has, as in FIG. 1, a movable upper part or slide 100, and a fixed lower part or plate 200.

 In the following, a vertical direction will be called a direction parallel to an axis connecting central parts of the slider 100 and the plate 200, that is to say a parallel direction, a direction of movement of the slider 100 towards the plate 200.

 The tool of FIG. 3 uses elements similar or similar to certain elements of FIG. 1. These elements have the same references as in FIG. 1 and will not be described again.

 In FIG. 3, the slide 100 is closed on the plate 200.

 In the bottom of the central cavity 115 of the surface 110 is a cavity 130 extending vertically in the slide 100. This cavity 130 opens onto a rectilinear horizontal passage 140 which extends horizontally to an external lateral face 118 of the slide 100.

 The horizontal passage 140 and the cavity 130 therefore form a bent conduit between the external lateral face 118 and the surface 110.

 This bent conduit is, in Figure 3, occupied by a part 400 having the shape of a locksmith key.

 More specifically, the part 400, shown in more detail in FIG. 4, is formed of four main parts which are a marking support 410, a longitudinal rod 420, an anti-rotation base 430 and a gripping plate 440.

 The support 410 is disposed near one end of the rod 420. It is formed of a parallelepiped extending along a mean plane containing a main axis X of the rod 420 and a radial direction relative to this axis X. More precisely, the support 410 extends, in this radial direction, from a peripheral edge of the rod 420, by a variable distance, this distance being measured between this peripheral edge and a radial end of the support 410.

 The support 410 has a length, which is a function of the number of characters used.

 It has a thickness, measured orthoradially to the X axis, which is proportional to the height of the characters.

 On a radial end face of the support 410 is disposed a portelettres 300 conforming to that described with reference to FIG. 2.

 The letter carrier 300 therefore has a common face with the support 410, and a face turned in a direction of radial distance from the rod 420.

 On this last face emerge the embossed marking characters.

 Parallel to the rod 420, the base 430 extends from the support 410 to the end of the rod 420.

At the opposite end of the rod 420 is disposed the plate 440 of oval shape, extending in a radial plane relative to the main axis
X of the rod 420. This oval plate 440 offers sufficient surface for easy gripping of the key 400 by an operator.

 Near the end extended by the plate 440, the rod 420 has a circumferential groove 450.

 In Figure 3, there is shown the key 400, within the stamping tool, in an operational marking position. In this position, the rod 420 extends through the passage 140, from an extreme opening thereof arranged on the external lateral face 118 of the press, and up to the level of the cavity 1 30.

 In FIG. 3, the support 410 extends vertically, from the rod 420 arranged in the passage 140, through the cavity 130, so that it emerges from the bottom wall of the cavity 115, opposite the surface 120, close enough to the latter so that the studs 330 can penetrate into a possible sheet metal disposed between the surfaces 110 and 120 when these surfaces are compressed against one another.

 At the opposite end of the rod 420, the gripping plate 440 emerges from the side face 118 of the press. The external lateral face 118 of the slide 100 is sufficiently distant from any part of the tool capable of closing on the hands of an operator so that the gripping plate 440 which emerges from this surface 118 can be manipulated by an operator in all security, including if all of the security measures mentioned above have been omitted.

 In Figure 5, there is shown a channel adapted to constitute the horizontal passage 140 of the device of Figure 3. This channel 140 consists of a wall extending longitudinally along an axis X1, with a U-shaped cross section or equivalent.

 The lateral branches of this U are rectilinear and parallel to each other, and the bottom wall of the U is perpendicular to these two lateral branches. There exists between the bottom of the U and the ends of the lateral branches of the U a length substantially equal to the sum of the diameter of the rod 420 and the radial extent of the support 410.

 The channel 140 is adapted to receive in longitudinal sliding the support 410 and the rod 420.

 In FIG. 6, the channel 140 is shown in cross section, and, in this channel 140, a cross section of the key 400 at the level of the support 410.

 As can be seen in Figure 6, the key 400 is inserted into the channel 140 by placing the rod 420 in the bottom of the U, while the support 410 is oriented, transverse to the axis Xl, parallel to the lateral branches of the U. The support 410 can go as far as protruding from the ends of these lateral branches of the U.

 On the inner surface of each of the lateral branches of the U, and at the ends of these lateral branches, over the entire length of the channel 140, are arranged holding rails 142 and 144 of the support 410. The rails 142 and 144 have, in a direction perpendicular to the lateral branches of the U and directed towards the inside of the U, a thickness such that between the two rails 142 and 144, there is a distance equal to the thickness of the support 410. Thus, the support 410 is , throughout its sliding inside the channel 140, held against rotation about the X axis.

 The channel 140 shown in FIG. 5 has a length less than a distance, measured on the rod 420, between the circumferential groove 450 and the edge of the support 410 which is closest to this groove 450.

 Furthermore, the channel 140 of FIG. 5 has dimensions such that when it is placed within the device of FIG. 3, a first end of the channel opens onto the face 118 and a second end of the channel reaches an edge of the cavity 130 which is closest to this surface 118.

 Thus, when the key 400 is inserted through its end carrying the support 410 inside the channel 140, through the end of the channel opening onto the face 118, it can be slid in this channel until the support 410 extends entirely from an opposite end of the channel 140.

 The channel 140 which has just been described is placed within the device of FIG. 3 so that the lateral branches of the U are oriented horizontally within the device of FIG. 3.

 The channel 140 in FIG. 5 also has two plates transverse to its main axis, arranged at its ends and intended to allow this channel 140 to be fixed within the device of FIG. 3.

These plates, referenced 146 and 148, are, more precisely, fixed one on the lateral face 118, the other on the edge of the cavity 130.

 Of course, a device according to the invention can be produced without requiring a channel 140 such as that of FIG. 5. As can be seen in FIG. 3, one can only provide a passage 140 consisting of a bore in the slide 100. In the embodiment of Figure 3, the bore 140 has, like the channel of Figure 5, a cross section suitable for guiding the key so that the support 410 is oriented horizontally.

 The key 400 is placed in the device of FIG. 3 in the following way. It is first introduced into the passage 140 by the opening of this passage opening onto the face 118, by placing the support 410 of the key 400 in a horizontal position. The key is then slid longitudinally in the channel 140 until the support 410 comes to be placed entirely in a bottom part of the cavity 130. More specifically, the key 400 is slid in the passage 140 until the support 410 is entirely disposed overhanging the opening of the cavity 130 opposite the surface 120.

 Then the key is actuated in rotation around the main axis X of the rod 420, so that the support 410 pivots in the cavity 130 and comes to orient itself in the cavity 130 in a vertical orientation, this is to say so that the support 410 extends vertically from the rod 420 closer to the surface 120 of the press plate.

 The structure of the cavity 130 and the way in which the support 410 is placed in this cavity 130 will be described below more precisely.

 FIG. 8 shows a vertical section parallel to an axis Xl of the passage 140, of the cavity 130 and of a part of the passage 140 adjacent to the cavity 130.

 In FIG. 9, this same assembly is shown in which a key 400 is slidably inserted along the axis X1, until the support 410 is partially introduced into the bottom of the cavity 130. In this position, the support 410 extends horizontally.

 The opening 130 has, in a horizontal direction perpendicular to the horizontal axis X1, a width sufficient to receive the support 410 and the rod 420 horizontally.

 Once the support 410 is fully engaged in the bottom of the opening 130 in a horizontal position, no obstacle hinders a rotation of the support 410 in a direction of rotation bringing it to a vertical orientation.

 The operator then activates the key 400 in rotation about its main axis Xl, until the support 410 adopts a vertical orientation through the cavity 130.

 In the embodiment described here, the channel 140 does not stop at the level of the cavity 130. It extends in the direction X1 beyond this cavity and forms, beyond the cavity 130, a cavity 155. This cavity 155 is open in the figures but this is not necessary for the operation of the device. The cavity 155 is therefore formed within an edge of the cavity 130 situated opposite the part of the channel 140 receiving the major part of the rod 420.

 There is shown in Figure 12 a cross section to the axis X1 of this cavity 155. The cavity 155 comprises a part 157 cyS, ldrique of revolution of axis Xl. This cylindrical part of revolution 157 has a diameter greater than or equal to that of the rod 420.

 In the lower part of this cylindrical passage of revolution 157, there is a parallelepiped cavity 158, in communication with the passage 157, which extends in a vertical direction.

This cavity 158 is complementary to the base 430 previously described. In particular, this cavity 158 has two vertical side walls 159 having a spacing between them equal to the thickness of
base 430.

 As can be seen in Figures 10 and 11, once the support 410 oriented vertically downwards through the cavity 130, the key 400 can still be moved in sliding along the axis Xl. Thus, the support 410, in a vertical position through the cavity 130, can be slid between two extreme positions.

 A first position corresponds to the abutment of the support 410 against a vertical face of the cavity 130 which is adjacent to the main part of the rod 420. In this first position, the base 430 is not engaged in the cavity 158 , and the rod 420 has its end in the cavity 130, not introduced into the cylindrical part 157.

 A second position corresponds to a position of the key 400 such that the base 430 is fully engaged in the cavity 158. In this position, an end portion of the rod 420 is engaged in the cylindrical cavity of revolution 157. In this second position , 'base 430 being held by the side walls 159 of the cavity 158, the key 400 is locked in rotation.

 The side walls 159 of the cavity 158 are here vertical. More generally, it is possible to provide any type of wall integral with the passage 140, extending, at least partially, parallel to the main axis Xl of the passage 140, capable of receiving, without play, the base 430 so as to block the base 430 in rotation around the main axis Xl.

 Thus, the establishment of the key 400 is carried out according to a usual gesture corresponding to the actuation of a key in a lock of a door of a dwelling. The installation of the letter carrier 300 is therefore particularly simple and does not require special attention on the part of the operator.

More specifically, the implementation of the key 400 is carried out in three main stages. The first step corresponds to an introduction of the rod 420 and the support 410 into the channel 140, in a position of the key where the support 410 extends horizontally. Once the key has been inserted deep enough into the channel 140 so that the support 410 is entirely contained in the cavity 130, a second step corresponds to a rotation of the key 400 so as to orient the support 410 vertically through the opening 130. A third step then consists in pushing the key in sliding along the axis X1 so as to engage
the base 430 in the cavity 158.

 FIG. 3 shows a device 500 for fixing the key 400 in the latter position where the base 430 is engaged in the cavity 158. This device 500 is placed on a lateral face 118 of the slide 100, at the level of the entrance to passage 140.

 This device 500 is shown more particularly in FIG. 7, along an observation point located in the axis of the passage 140, outside the press. This device 500 consists of a block 520 attached at the entrance to the channel 140 on the face 118 of the slide 100.

 It has an opening 530 which extends, transverse to the direction X1, in a horizontal direction, leaving the channel 140 open on the outside of the press. The block 520 is also crossed by a channel 540 extending transversely to the axis X1 of the passage 140, and into which a sliding finger 550 is introduced.

 More precisely, the channel 540 opens onto the opening 530 at a location of the latter which is intended to receive more particularly the rod 420. The finger 550 is provided to emerge in the opening 530.

 The finger 550 is provided with a helical spring 552 whose effect is to return the finger 550 towards the opening 530, in a position where it emerges inside the opening 530. The finger 550 also extends at its opposite end so as to protrude from the block 520 on a lateral face thereof. It is extended at this end by a grip wheel 555 allowing an operator to manually move the finger in the channel 540, from outside the block 520.

 When the key 400 is introduced into the channel 140, an operator pulls the thumb wheel 555 so as to erase the finger 550 outside the opening 530, then subjects the key 400 to the three steps previously described. The distance between the base 430 and the groove 450 is such that, after these three stages, when the base 430 is engaged in the cavity 158, the circumferential groove 450 is in the extension of the channel 540 and the finger 550. L the operator can thus release the thumb wheel 555, and then the finger 550, under the effect of the spring 552, penetrates inside the opening 530 and into the circumferential groove 450 of the key 400.

 The key 400 is then blocked in translation along the axis X. The base 430 being located inside the cavity 158, the key 400 is blocked not only in rotation by the base 430 and the cavity 158, but also in translation by the circumferential groove 450 and the finger 550.

 Of course, the key can be released by pulling the finger 550 out of the groove 450 and then pulling the key out of the machine so as to extract the base 430 from the cavity 158, by subjecting the key to a rotation around the X axis so as to orient the support 410 horizontally, and finally by sliding the key along the X1 axis.

 Thus, the letter carrier 300 disposed on the support 410 can be placed in the operational position on the slide 100 from outside the press, without an operator having any body part in a dangerous area of the machine, for example an area capable of being closed between two elements of the press.

 Therefore, the usual security procedures are no longer necessary.

 Furthermore, it is possible to remove a key 400 and replace it with another key. Such an operation takes approximately 50 seconds.

 By using a set of several keys, the pads 330 of the letter holders 300 can be changed while the machine is operating with another key, so that the change of pads is carried out in masked time.

 Furthermore, the key 400 can be changed to the open position of the press, as shown in FIG. 1, or to the closed position, the slide 100 being supported on the plate 200 as shown in FIG. 3.

 It is possible, during a code change, to extract the key 400 from the slide 100, to replace it with another one or to change the letters of the letter holder 300 of this key, and to reintroduce this key in the tool. In this variant, the duration of the intervention remains particularly short, compared to the intervention durations necessary with the devices used until now.

 As can be seen in FIG. 3, the tool is provided, between the slide 100 and the plate 200, with elastomeric shims 610 and 620. The shims 610 and 620 are arranged on either side of the tool, each of them being supported both on the slider 100 and on the plate 200 by means of horizontal surfaces thereof.

 The shims 610 and 620 have a sufficient height so that, when the slide 100 is pressed at rest on the plate 200 by means of the elastomer shims 610 and 620, the bottom of the cavity 115 is sufficiently distant from the surface 120 to allow the letter holder 300 emerges from the bottom 115 without touching the surface 120.

 Thus the role of the elastomeric shims is to allow rotation of the support 410 without any co tray 200 during a production cycle, under the effect of the inertia of the slide 100 and a thrust of a motor. electric on the slide 100 in the direction of the plate 200, the shims 610 and 620 are deformed and allow the arrival of the letter carrier 300 bearing on a sheet metal to be stamped disposed on the surface 120, so that this sheet is marked .

 Thus, the invention provides a marking device allowing a particularly easy and safe change of marking code.

 Thanks to this device, only a stop of the press cycle is necessary, the downtime of the production means is significantly reduced.

 In addition, the codes can be changed by an operator remaining in a standing position, with the arms at chest level. The operator's working conditions are therefore significantly improved.

 These code change operations are carried out, as part of a non-manufacturing change, at the place of storage of the tool, preferably while the tool is closed. No handling, opening, closing or moving of the tool is necessary. The average duration of such an intervention outside of manufacturing is thirty minutes. Of course, the key change can also be carried out with the tool open.

 We have described here a particular embodiment of the invention in the case of a stamping tool. Of course, it will be possible to adapt the provisions in accordance with the invention, making it possible to quickly change a marking code, to any type of tool having two elements capable of enclosing a part, in particular a stamped part or intended to be stamped.

 In the previous example, the marking support was placed on a mobile part of such a transformation tool. Of course, we can adopt marking means in accordance with those described above in a stationary part of a processing tool. For example, in the case of a tool conforming to that described above, the marking means could be placed on the plate 200 of the press.

 Of course, these marking arrangements in accordance with the invention can be easily adapted to different parts processing devices and for example a tool for manufacturing plastic parts. It will thus be possible to produce a key conforming to that described above, according to any type of dimensions appropriate to the device on which it is to be adapted.

Claims (11)

 1. Device for manufacturing parts, comprising elements (100,200) able to close on a part, a support (410) carrying a marking code (300) removably placed on one of these elements (100,200) in one place marking (130) adapted so that the support (410) comes to bear against the part when the elements (100,200) close on the part, characterized in that it has a passage (140) extending from the place marking (130) to a part of the device that is constantly accessible (118) whatever the state of opening or closing of the device, the support (410) being adapted to slide in the passage (140) between the part constantly accessible (118) and the marking location (130).  2. Device according to the preceding claim characterized in that the support (410) is extended by a rod (420), the rod (420) being of a length at least equal to a distance separating the marking location (130) and the constantly accessible part (118), and the rod (420) being adapted to slide in the passage (140).  3. Device according to the preceding claim, characterized in that the support (410) extends from the rod (420) in a radial direction relative to the latter, the marking code (300) being arranged on a radial end of the support (410).  4. Device according to any one of the preceding claims, characterized in that, a final orientation being defined as an orientation of the support (410) when it is able to bear against the workpiece, at least part of the passage ( 140) is adapted to be crossed by the support (410) while it has a second orientation, different from this final orientation.  5. Device according to the preceding claim, characterized in that said at least part of the passage (140) opens onto a cavity (130) of sufficiently large dimensions to allow rotation of the support (410) about a main axis (X ) of the rod (420) between the second orientation and the final orientation.  6. Device according to any one of claims 2 to 5, characterized in that it comprises a retaining element (550), adapted to be moved transversely to a longitudinal direction (X1) of the passage (140) and fixed in displacement in the longitudinal direction (X1) of the passage (140), and means (450) on the rod (420) capable of receiving the retaining element (550).  7. Device according to the preceding claim, characterized in that the retaining element (550) is a finger (550) provided with a spring (552) able to return the finger (550) in the direction of the passage (140), and in that the means (450) on the rod (420) are a circumferential groove (450).  8. Device according to any one of claims 2 to 7, characterized in that the rod (420) is provided with a base (430) extending radially relative to the rod (420) and in that the device has two walls (159) integral with the passage (140), extending, at least partially, parallel to a main axis (X1) of the passage (140), capable of receiving, without play, the base (430) so as to block the base in rotation about the main axis (Xi).  9. Device according to the preceding claim, characterized in that the walls (159) are arranged so that the base (430) engages with each other under the effect of a depression of the rod (420) in the passage (140), from the constantly accessible part (118).  10. Device according to any one of claims 6 or 7 in combination with any one of claims 8 or 9, characterized in that the rod (420) has dimensions adapted so that when the base (430) is engaged between the two walls (159), the means (450) on the rod (420) are placed so as to be able to receive the retaining element (550).  11. Device according to any one of the preceding claims, characterized in that it includes wedges (610,620) of deformable elastic material arranged between the elements (100,200), capable of keeping the elements (100,200) sufficiently distant when they are at rest. one against the other, to allow the support (410) to be placed in the operational position, and sufficiently deformable to allow these elements to be pressed against each other when the elements (100,200) are closed on a coin.