CZ294728B6 - Device for setting rivets, buttons or the like - Google Patents

Abstract

In the present invention, there is disclosed a device for setting rivets, buttons or the like having an upper tool (21) and a lower tool (5). The upper tool (21) can preferably be actuated by a tappet (20) and one of the tools (21, 5) carries out an evading movement during riveting wherein the device is provided with feeding rails (9, 14, 15) for transporting parts (7, 10) of rivets or buttons. In order to provide a device of this type characterized by an improved maneuverability, a correct riveting and a highly reliable operation, without altering the proven basic design, the extent of the evading movement of the tool (21, 5) is used to monitor the riveting operation.

Description

Devices for attaching rivets, buttons or the like

Technical field

The invention relates to a device for attaching rivets, buttons or the like, comprising an upper tool and a lower tool, wherein the upper tool is operated by a ram and one of the tools performs a downward movement during the riveting process, the device comprising guide rails for transporting rivet parts or buttons .

BACKGROUND OF THE INVENTION

A device of this kind is known, for example, from DE 44 31 948 A1. The content of this patent application is fully incorporated into the contents of the present application, also for the purpose of incorporating the features of this application into the claims of the present application. In this patent application a device is described in which the upper end of the ram that acts on the upper tool is pressed by a spring to the peripheral surface of the cam disc, which is axially arranged on the drive shaft of the motor. The rivets, knobs or the like to be mounted each consist of an upper part and a lower part. These upper parts and lower parts are kept in separate containers and are fed from these containers to the area of the charging slide by means of supply rails. The charging slide is displaceable in a horizontal direction and is provided with an upper sliding bar and a lower sliding bar. The upper insertion bar always moves one upper part of the object to be inserted into the retaining tongs associated with the upper tool, while the lower insertion bar aligns the lower parts of the object to be placed in the region of the lower tool with the upper part. The lower tool is pivotably mounted on the mounting plate so that the lower tool engages the lower side of the fabric to engage the upper part with the lower part on the fabric. The lower part of the fitting is provided with teeth which, due to pressing against the underside of the fabric, penetrate through the fabric. The lower tool, depending on the thickness of the fabric, can make a greater or lesser backward movement against the action of the compression spring during the riveting process, which results in a pivoting around the bearing pin of the lower tool.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the construction of the described apparatus, while maintaining the proven basic principles, in order to improve the ability to control the correct riveting and increase the operational reliability of the apparatus.

SUMMARY OF THE INVENTION

This object is solved and the drawbacks of known devices of this kind largely eliminate a device for attaching rivets, buttons or the like, which consists of an upper tool and a lower tool, the upper tool being operated by a ram and one of the tools performing a downward movement during the riveting process. The device comprises supply rails for transporting rivet parts or knobs according to the invention, characterized in that the path of the recessing movement of the tool is removable for monitoring the riveting process. Due to this embodiment, a device for attaching rivets, buttons or the like is achieved with an extremely simple construction and high reliability. The quality of riveting depends, inter alia, on the insertion depth of the teeth of the lower part of the object to be inserted under the peripheral flange of the upper part of the object, which can be designed as a spherical or spring element. The required dimensions, the so-called "pinch setting", which is the distance between the bottom and the top of the rivets, should not be exceeded. When riveting the upper part with the lower part of the object to be inserted, i.e. a rivet, a knob or the like, the tool retreats more or less against the leveling spring force on the single or multilayer fabric. The downward travel path can be considered a measure of riveting strength.

-1 CZ 294728 B6

It is advantageous here to provide a device in which the path of the downward movement of the lower tool is removable for monitoring the riveting process. By determining the recess rate, a check is obtained which, for example, gives the operator a signal as to whether the depth of immersion of the teeth of the lower part into the peripheral flange of the upper part of the item to be placed is sufficient.

In this case, a solution can be used in that the lower tool activates a contact switch, which issues a fault message when the predetermined path is exceeded. The embodiment in which the device is stopped in this case is advantageous. The operator is thus instructed to check or repeat the riveting operation. The path of movement of the lower tool is preferably monitored by means of a sensor. This measuring sensor can be arranged, for example, on the compensation spring of the lower tool. The measuring sensor is then able to reliably indicate, in cooperation with the evaluation circuit, whether the depth of insertion of the teeth of the lower part into the peripheral flange of the upper part of the object to be inserted is sufficient. This makes it possible to make judgments about the pinch setting, which corresponds to the distance between the top and bottom of the rivet or the like after riveting. Alternatively, the lower tool can activate the switch after exceeding a predetermined path of the recess movement. This switch can be a contact switch or proximity sensor. If the predetermined maximum path is maintained, the switch arranged in the path of the lower tool is not activated. The riveting is correct in terms of the permissible distance between the lower and upper sides of the rivet. However, when objects such as rivets, buttons or the like are placed on a multilayer fabric whose thickness causes the predetermined path of the downward movement of the lower tool to be exceeded, the lower tool activates a switch, for example a contact switch arranged in the path of the lower tool. As a result of the activation of this switch, the attachment device is preferably stopped. The reliability of the measuring apparatus depends largely on the calibration after the tool or punch has been changed, after the insert has been changed with a different tooth length of its lower part or after the circumferential flange pressure on the upper part has been changed. It is therefore necessary, for example by means of optical indication and digital adjusting elements, to make calibration as simple as possible. Thus, for example, a scale or the like can be provided on the device, by means of which a switch can be set according to the desired mutual distance between the lower and upper side of the rivet to be formed, which monitors the movement of the lower tool.

The present invention also relates to an apparatus as described above, the apparatus comprising supply rails for conveying parts of rivets or knobs. In order to achieve a reliable course of the riveting process, it is provided that at least one lead-in rail is provided with a sensing device for monitoring the movement of the rivet part or the knob. This sensing device senses the movement of the push-on objects to be pushed, whereby the actual sensing can be provided, for example, by a switch built into the feed rail or the like. However, it is preferred that each supply rail is provided with a light barrier for the upper and lower parts of the objects to be mounted. During the deployment cycle of moving objects, as they pass through the photocell area, they generate voltage pulses that can be utilized so that an error message is sent in the absence of a pulse. Said failure can be caused either by blocking the part in the supply rail or as a result of the depletion of the rivet supply in the magazine and / or in the supply rail. By means of this sensing device, not only the presence of the parts of the articles to be placed in the guide rails is monitored, but also the movement of these parts in the guide rails. In particular, the latter makes it possible to draw conclusions as to whether, in the previous deployment cycle, a part of the object to be removed has been removed from the track in question. If this is not the case, the following parts cannot be inserted. The tracking pulse is omitted, which is preferably used to stop the device.

The invention also relates to an apparatus as described above, in which a part of the rivet or knob is guided through the guide rail into the path of movement of the charging slide. The sensing device is arranged at a distance corresponding to a plurality of rivet or button parts in the feed rail in the movement path of the charging slide. Due to this embodiment, the idling rail of the respective supply rail is eliminated. When light is used as the sensing device

Preferably, the light beam is oriented transversely to the direction of movement of the parts of the articles to be attached. For this purpose, a through hole for the light beam is provided at a suitable location with the advantageously cured lead rail. Furthermore, the device according to the invention can advantageously be designed in such a way that the separate supply rails from the respective containers, where different upper parts of the objects to be mounted, for example the spherical or spring elements mentioned, are arranged parallel to each other. However, since only one or the other upper part of the object to be inserted can be processed in one setting cycle, only the light barrier belonging to the currently installed top part is activated.

Another advantageous embodiment of the device according to the invention is that in each riveting process the end position of the charging slide can be monitored.

It is preferred in this case that the forward end position of the charging slide is traceable. In this way, the path between the lead-in rail and the riveting area, i.e. the upper and lower tool areas, is also monitored. For example, if during the movement of the part of the item to be fed from the supply rail into the riveting region by means of the charging slide, the latter is not reached in its front end position. Reaching this end position is monitored, for example, by a sensor or switch that generates a signal in the event of a fault, preferably to disconnect the entire device. Due to this embodiment, the pressure of the slide on the upper tools is avoided in the absence of the part of the item to be placed in the riveting area. Such a blanket riveting could, for example, lead to fabric damage.

The invention also relates to a device in which the upper tool is coupled to the ram and the movement of the ram is traceable.

It is particularly preferred that the follower bending of the ram is performed by monitoring the movement of the cam disc that controls the movement of the ram. In practice, this can be accomplished by arranging a control switch with the cam disk or detecting the course of the cam track with the sensor. Monitoring of the movement of the ram is particularly advantageous in connection with the tracking of the guide rails, since the removal of the parts of the articles to be inserted from the guide rails and thus the displacement of the following parts takes place only at a predetermined interval of the deployment cycle. If the sensor or the like detects a cam track area predefined for the feed rails in the slide sensor, then the evaluation unit also expects a signal from the feed rail readers. Failure to receive the relevant signals behind the feed rail sensing devices within this interval leads to a stop of the entire device. As soon as the predetermined area of the cam disc leaves the sensor to monitor the movement of the ram, the sensing devices on the feed rails are deactivated. The time dependence between the signal from the feed rails and the control signal from the cam disc is given by the position of the light barrier relative to the parts of the objects to be mounted in the feed rail. A minimum angular distance of 30 ° is used.

The signal from the sensing device on the feed rails is thus traceable as a function of the slide movement cycle. The control and monitoring devices described above may be used singly or in combination in the described apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated by the following non-limiting examples, which are described in the accompanying drawings, which show:

1 shows a side view, partly broken away, of a device for attaching rivets, buttons or the like according to the invention, with the slide in the upper dead position; FIG.

FIG. 2 is a detailed view of the device of FIG. 1 in the region of the lower tool and the upper tool, with the slide also in the upper dead position;

-3 CZ 294728 B6

Fig. 3 is a front view of the device of Fig. 1, showing containers for receiving parts of the articles to be mounted;

FIG. 4 shows a representation corresponding to FIG. 1, but with the tools occupying the riveting position;

Fig. 5 is a detailed view corresponding to Fig. 2, but showing the position of Fig. 4;

FIG. 6 shows a greatly enlarged detail of a rivet mounted on the fabric;

FIG. 7 is a further detailed view, enlarged from FIG. 5, showing correct riveting, with the jig actuating the lower tool releasing the control switch;

FIG. 8 is a detailed view corresponding to FIG. 7, but in the case where the riveting is not correct due to the excessively thick fabric, the lower tool boom abuts the control switch;

FIG. 9 is an enlarged sectional view showing a perspective sectional view of the region of the feed rails extending from the containers to the device;

Fig. 10 is a view corresponding to Fig. 2, but showing a second embodiment of the tracking of the lower tool;

FIG. 11 is a view corresponding to FIG. 5, but for the embodiment of FIG. 10;

and

FIG. 12 shows a representation corresponding to FIG. 11, but with incorrect riveting due to too much fabric thickness.

DETAILED DESCRIPTION OF THE INVENTION

The device or machine for setting rivets, buttons or the like according to the invention consists of a vertically oriented stand 2, which is supported by a base plate 1. On the stand 2 is mounted a U-shaped mounting plate 3 rotated 90 ° counterclockwise . The lower arm of this mounting plate 3 forms a boom 4.

At the free end of the boom 4 is provided a lower tool 5, which in cross-section comprises a circular anvil 6, into whose upper end the lower part 7 of the object to be inserted is inserted.

The lower parts 7 of the fitting objects are previously stored in a magazine 8 which is arranged side of the mounting plate 3 and from which the supply rail 9 runs obliquely downwards towards the boom 4. The lower parts 7 of the fitting objects are formed by retaining elements which are provided with teeth. to be connected to two different upper parts of the objects to be mounted. In the drawings, the upper part 10 of the fitting object is shown. It serves as a functional part in the form of a spherical element and can be attached to the fabric 11 together with the bottom part 7. The two differently shaped upper parts 10 of the object to be inserted, i.e. the spherical part and the spring part, are fed from containers 12 and 13 opposite. 8 and provided with feed rails 14 and 15 which lead to the area of the charging slider 16. The charging slider 16 is displaceable in a horizontal direction and is provided with an upper sliding bar 17 and a lower sliding bar 18. The upper sliding bar 17 moves the upper part 10 pliers 19, while the lower insertion bar 18 moves the lower part 7 of the fitting object into alignment with the anvil 6 of the lower tool 5. One or the other upper parts 10 of the fitting item can be brought into the region of movement of the upper fitting 17 The feeders 14 or 15, the supply of which is controlled by control solenoids (not shown).

The holding pliers 19 are in alignment with the lower tool 5 in the initial position of the device and are supported by a sliding stone which is guided at the lower end of the slide 20, which is arranged opposite the lower tool 5.

-4GB 294728 B6

The slide 20 carries at its lower end an upper tool 21 which, in the upper dead position of the slide 20 according to FIGS. 1 to 3, terminates above the bed for the upper part 10 of the object to be mounted in the region of the holding tongs 19.

The ram 20 is provided at its upper end with a roller 22. This roller 22 is pressed by a compression spring in the circumferential normal path of the cam disc 24, which is mounted on the drive shaft 25 of the electromotive drive 26. During rotation of the cam disc 24 move down and up again to the top dead position. A boom 27 is also mounted on the slide 20, which carries a control pulley 28. The arm 29 of the lever 31 protrudes against the underside of the control pulley 28 and is pivotably mounted on a pin 30 on the mounting plate 3. The lever arm 32 of the lever 31, the end of which in the position shown in FIG. 1 to extend vertically, is provided with a gate 33 in which the gate stone 34 extends. This gate stone 34 is connected to a slide slide 16 in the form of a slide. when the lever 31 is pivoted, it can be moved in the slide guide 35 on the side of the stand L

At the lower end of the lever arm 32, a control path 36 is formed, on which a sensing pulley 37 rests, which is arranged at the free end of the control lever 38. This control lever 38 is mounted on a pin 39 on the mounting plate 3. there is a tension spring 41 which presses the control lever 38 against the lever 31, which is consequently pressed by its arm 29 against the control pulley 28 of the ram 20.

A cam track 42 is formed opposite the pickup roller 37 near the pin 39, which cooperates with a pivot pin 43 which is secured against rotation and is guided in a laterally extending transverse arm 44 of the transmission lever 45. The pick pin 43 is transferred by a transmission compression spring. 46 and in the thread of the adjustable counter 47 rests against the lower end of the transmission lever 45, which is designed essentially as an angle. The transmission lever 45 extends at the top of its knuckle on a transverse pin 48 on the boom 4. The free end of the transmission lever 45 extends below the lower tool 5. The transmission lever 45 projects angularly into the annular groove 50 at the lower end of the lower tool 5. The return spring 51, which is mounted near the counter 47, acts on the transmission lever 45 so that its sensing pin 43 abuts the control lever 38, as shown in Figures 1 to 3, in the region upstream of the cam track 42.

A projection lamp 52 serves to precisely position the parts 7, 10 of the object to be placed onto the fabric 11. This lamp 52 is mounted on a stand 2 and forms, for example, a crosshair on the upper side of the fabric 11.

According to FIGS. 1 to 3, the slide 20 assumes an upper dead position in relation to the respective rotation of the cam disk. The upper insertion piece 10 has been passed through the upper insertion bar 17 into the holding pliers 19, while the lower insertion bar 18 has moved the lower insertion part 7 into the lower tool 5.

By engaging the foot switch 53, which is arranged on the base plate 1, the drive is switched on, which is associated with the rotation of the cam disc 24 in the direction of the arrow of FIG. 3, causing the slide 20 to move downwards. As a result, the holding pliers 19 also move downwards and stop at a certain distance from the lower tool 5.

Due to the downward movement of the slide 20, the control roller 28 engages the arm 29 of the lever 31 and deflects the lever 31 in an anti-clockwise direction, which is associated with driving the charging slide 16 with its sliding bars 17 and 18. during this process to the sensor pulley 37 of the control lever 38 and swivel the control lever 38 clockwise. The sensor pin 43 abuts the cam track 42, whereby the transmission lever 46 pivots the transmission lever 45 so that the lower tool 5 moves approximately at the same time as the holding pliers 19 and the slide 20 are stopped. the insertion causes the downward movement of the slide 20 and the holding pliers 19 downwards to abut the holding pliers 19 on the upper

The slide 20, on the other hand, moves further downwardly in order to engage the lower part 7 with the upper part 10 of the object to be placed. The teeth of the lower part 7 of the fitting object pierce the fabric 11 and slide under the peripheral flange of the upper part 10 of the fitting object.

The lower tool 5 can perform a deflection movement during this riveting process, the amount of the deflection movement depending on the thickness of the fabric 11 in the riveting region. This deflection movement is made possible by a non-rigid displacement of the transfer lever 45. The pressure compression 46 is thereby compensated for by a transfer spring 46 which is compressed to a degree corresponding to the deflection movement.

Said deflection movement is used to control the riveting process. For this purpose, a contact switch 54 is used in the first embodiment shown in FIGS. 1 to 3.

The quality of riveting depends primarily on the insertion depth of the teeth of the lower part 7 of the fitting object under the peripheral flange of the upper part 10 of the fitting object, which is designed as a spherical or spring element. This insertion depth is directly dependent on the thickness of the fabric 11 and the length of the teeth on the lower part 7 of the object to be inserted. During riveting, a certain amount given by the distance and between the upper and lower sides of the rivet 55 after riveting must not be exceeded - see Fig. 6. When riveting the lower part 7 and the upper part 10 of the item to be inserted in the monolayer or multilayer fabrics 11 the lower tool 5 and the transmission lever 45 associated therewith. The extent of this recession can be considered a measure of riveting strength.

Said contact switch 54 is displaceably arranged on the mounting plate 3. This makes it possible for this contact switch 54 to be set according to the maximum distance between the upper and lower sides of the rivet 55, for example a scale or the like can be provided on the mounting plate 3 for this purpose.

Figures 7 and 8 show schematically the riveting of two fabrics 11 with different thicknesses. According to FIG. 7, the rivet 55 is mounted on a fabric 11, the thickness of which is such that a predetermined distance between the upper and lower sides of the rivet 55 is selected, which is selected according to the length of the teeth on the lower part 7 of the item. The lower tool 5 and the transmission lever 45 do not recede or recede only slightly, so that the monitoring contact switch 54 used is not activated by the transmission lever 45. No signal is given.

According to FIG. 8, on the other hand, a fabric 11 is selected whose thickness is the use of the same lower part 7 of the fitting object as in FIG. 7 which causes a predetermined distance to be exceeded. The lower tool 5 and the transmission lever 45 are so far retreated that the contact switch 54 is actuated. This actuation generates a signal which, for example, can be used by the evaluation circuit to provide the operator with an incorrect riveting signal by means of an optical indicator. An embodiment in which the signal causes a stop of the device is advantageous in order to enable the riveting already carried out to be checked and possibly repeated.

Alternatively to the contact switch 54, measuring sensors, proximity sensors or the like may also be used. In this way, the possibility of optical display is achieved and the digital input elements achieve the most simple calibration. This is particularly important because the reliability of the measuring apparatus depends largely on the calibration after replacing the punch, changing the set items with different tooth lengths or changing the pressure of the peripheral flange of the upper part.

In the riveting position, the charging slide 16 is also moved back so far that the push-in strips 17 and 18 are located in front of the parts 7 and 10 to be inserted. In this position, the workpiece parts 7, 10 are automatically moved in the guide rails 9, 14 and 15, and the workpiece part 10, 7 is always positioned in front of the respective insertion rail 17, 18. This movement of the workpiece parts 7, 10 is blocked during the remainder of the cycle, since the insertion strips 17, 18 or the charging slide 16 are at this time located in front of the mouths of the supply rails 9, 14, 15 and close these mouths.

-6GB 294728 B6

According to the invention, the movement of the moving parts 7, 10 of the objects to be mounted in the guide rails 9, 14, 15 is monitored by a sensing device 56 formed by a light barrier 57, each supply rail 9, 14 and 15 having its own sensing device 56.

These sensing devices 56 sense the movement of the moving parts 7, 10 of the articles to be mounted as soon as the deployment process has started. Each deployment cycle causes a pulse in the sensing device 56 as a result of the displacement of the parts 7, 10. This can be used to generate a fault message in the absence of a pulse. Such a failure can be caused either by blocking of the component 7, 10 or also when the supply of components 7, 10 in the supply rail 9, 14, 15 or in the container 8, 12, 13 is exhausted. 7, 10 in the feed rails 9, 14, 15, but also the desired movement when the parts 7, 10 are moved in the retracted position of the charging slide 16.

The light curtains 57, which form the sensor device 56, act approximately transversely to the direction of movement of the parts 7, 10 or transversely to the guide rails 9, 14, 15, which are provided in the guide rails 9, 14, 15 to pass through the light beam. 58 through the through holes.

As already mentioned, one of the reservoirs 12, 13 for the upper parts 10 of the articles to be mounted and thus the respective supply rail 14 or 1.5 is activated or deactivated by means of the control electromagnets. This also activates the sensing device 56 of the currently active feed rail 14 or 15, so that a fault message from the area of the deactivated feed rail 15 or 14 is thereby prevented.

This control of the feeding of the parts 7, 10 to be mounted further operates in dependence on the movement of the slide 20. Here, the monitoring is derived from the movement of the cam disc 24 by which the slide 20 is actuated. a control switch 59 so that the signal from the sensing device 56 on the lead-in rail 9, 14, 15 is brought into temporal or angular dependence on the deployment cycle. The timing control switch 59 sends a signal to the evaluation unit, for example, when the retracted position of the charging slide 16 is detected due to the position of the cam disk 24. At this time, signals from activated sensor devices 56 caused by the movement of the parts 7 must also be sent to the evaluation unit. , 10 deployed items. The evaluation unit checks the received signals and, in the event of a fault message, advantageously causes the entire deployment device to stop.

The sensor devices 56 are arranged in the region of the guide rails 9, 14, 15 so that it is ensured that there are in each case a plurality of parts 7, 10 of the objects to be inserted between the sensor devices 56 and the charging slide 16. In this way it is ensured that the supply rails 9, 14, 15 also do not run completely idle. In the region between the sensing devices 56 and the charging slide 16, there is thus always a reserve of parts 7, 10 of the articles to be mounted.

Furthermore, the supply of the lower parts 7 and upper parts 10 of the objects to be inserted is monitored in the region of the lower tool 5 and the upper tool 21. For this purpose, for example, a sensor 60 is provided on the mounting plate 3. the front end position of the lever arm 32. If, for example, the object portion 7, 10 'of the mounted object becomes jammed during the forward movement of the charging slide 16, this leads to a stop of the charging slide 16a of the lever arm 32. in the event of a fault it sends a signal. This signal is preferably used to stop the deployment device.

The above-described sensing and monitoring devices can be used in the device according to the invention both individually and in combination.

-7EN 294728 B6

In addition, depending on the course of the cycle, signals from sensing the distance between the lower and upper sides of the rivet 55 and the signals of the position of the charging slide 16, derived from the position of the cam disc 24, can be monitored.

10 to 12, an alternative embodiment for monitoring the distance between the lower and upper sides of the rivet 55 is shown schematically in another exemplary embodiment. Linear displacement of the ejector 61 is used here to move the lower tool 5 to the riveting position using the cam disc 24. upstream of the transfer lever 63 is preceded by a transfer compression spring 62 which, at the end opposite to the ejector plate 61, rests on the side of the transfer lever 63 against a plate 64. Coaxially with this plate 64, a signal thumb 65 is formed on this plate 64. The free end of this signal finger 65 extends into the sensing area of the sensor 66, which is disposed on the stand 2.

FIG. 11 shows a riveting position in which the predetermined distance between the lower and upper sides of the rivet 55 is maintained due to the permissible fabric thickness 11. The signal thumb 65, which is directly connected to the plate 64 and the transfer lever 63, has left its sensing end As a result, no signal is sent.

In Fig. 12, the rivet 55 is to be mounted on a fabric 11 whose thickness causes the predetermined relative distance between the lower and upper sides of the rivet 55 to be exceeded. The lower tool 5 and consequently the transfer lever 63 during riveting due to excessive fabric thickness 11 retreats. The compression spring 62 is compressed between the ejector element 61 which has not retreated and the plate 64 on the side of the transmission lever 63. The signal thumb 65, which is formed on the plate 64, on the other hand, moves toward the sensing area of the sensor 66, which in this situation sends a signal to turn off the device or at least to the indicator for informing the operator.

The features of the invention described in the foregoing description and claims and illustrated in the drawings may be relevant to the practice of the invention both individually and in any combination. All the features described are important to the invention. The scope of the invention is also determined by the content of the respective priority application, the full content of which is hereby claimed.

Claims (12)

PATENT CLAIMS A device for attaching rivets, buttons or the like, comprising an upper tool (21) and a lower tool (5), wherein the upper tool (21) is operated by a slide (20) and one of the tools (21,5) performs during In the riveting process, the recoil movement, the apparatus comprising guide rails (9, 14, 15) for conveying rivet parts or knobs, characterized in that the path of the recessing movement of the tool (21, 5) is removable to follow the riveting process. Device according to claim 1, characterized in that the path of the downward movement of the lower tool (5) is removable for monitoring the riveting process. Device according to one or more of the preceding claims, characterized in that sensors activated by the movement of the lower tool (5) are arranged in the path of the downward movement of the lower tool (5). Device according to one or more of the preceding claims, characterized in that the lower tool (5) is a contact switch (54) which can be activated when the predetermined path is exceeded. -8EN 294728 B6 Device according to one or more of the preceding claims, characterized in that at least one supply rail (9, 14, 15) leading to the tools (21,5) is provided with a sensing device (56) for monitoring the movement of the part (7, 10). ) rivet or knob. Device according to one or more of the preceding claims, characterized in that the sensing device (56) is arranged at a distance corresponding to the charging slide (16) in the feed rail (9,14,15) from the charging slide (16). more parts (7, 10) of rivets or buttons. Device according to one or more of the preceding claims, characterized in that the end position of the charging slide (16) can be monitored in each riveting process. Device according to one or more of the preceding claims, characterized in that the forward end position of the charging slide (16) is traceable. Device according to one or more of the preceding claims, characterized in that the upper tool (21) is coupled to the slide (20) and the movement of the slide (20) is traceable. Device according to one or more of the preceding claims, characterized in that the movement of the ram (20) is traceable by the movement of the cam disc (24) for controlling the movement of the ram (20). Device according to one or more of the preceding claims, characterized in that a control switch (59) is arranged on the cam disc (24). Device according to one or more of the preceding claims, characterized in that the signal from the sensing device (56) on the guide rails (9, 14, 15) is traceable as a function of the cycle of movement of the slide (20).