DE19628679A1 - Device for exposing rivets, buttons or the like - Google Patents

Abstract

A device for setting rivets, buttons or the like has an upper tool (21) and a lower tool (5). The upper tool (21) can preferably be actuated by a tappet and one of the tools carries out an evading movement during riveting. In order to provide a device of this type characterised by an improved manoeuvrability, a correct riveting and a highly reliable operation, without altering the proven basic design, the extent of the evading movement is used to monitor the riveting operation.

Description

The invention relates to a device for preparation of rivets, buttons or the like with an upper structure stuff and a lower tool, the upper tool is preferably tappet and a tool in Performs an evasive movement during the riveting process.

A device of the type in question is, for example. known from DE 44 31 948 A1. The content of this Patent application is hereby fully incorporated into the Disclosure of the present invention included, too for the purpose of features of this patent application in An to include claims of the present invention. In this patent application describes a device ben, where an upper end of the upper tool pressurized plunger spring-loaded against an order catching surface of a on a drive shaft of an engine axially arranged cam disc occurs. To set that up the rivets, buttons or the like exist in each case from an article upper part and an article lower part. These tops and bottoms are in separate magazines stored and get out of the magazines Feed rails in the area of a loading slide. This can be moved horizontally and with an upper one Insert bar and a lower insert bar verse hen. The upper slide-in bar has an arti upper part in a holder assigned to the upper tool pliers, while the lower slide-in bar the article un Upper parts in alignment with the upper part in the Area of the lower tool moves. The lower tool is via a pin mounted in a mounting plate pivoted so that the lower tool for riveting the upper part and lower part to a Tex  tilie with the Arti arranged in the lower tool lower part bumps against the underside of the textile. The lower part of the article is provided with serrations, which due to the underside of the Tex tilie penetrate this. Depending on the thickness of the textile the lower tool can do more during the riveting process or less an alternative to a compression spring movement in the form of a swing out around the bearing journal carry out.

In view of the state of the art described above becomes a technical problem of the invention therein seen a device of the type in question while maintaining the proven basic form, which is characterized by an improved control option correct riveting and high functionality security.

This problem is first and foremost with Subject of claim 1 solved, being abge is that the extent of the evasive movement to Superv the riveting process is used. As a result of this Design is a device for attaching Rivets, buttons or the like of particularly simple Chem structure and high reliability specified. The The quality of riveting depends on a. from the immersion depth the jag of the lower part of the article in the flanged edge of the article upper part, which is a ball or spring can be part of. Given dimensions, so-called pinch setting dimensions are not exceeded the. When riveting the top part and arti lower part in single or multi-layer textiles gives way a tool more or less in one by spring due to pressure equalization. The length the escape path can be used as a measure of the strength of the  Riveting. This is preferred training in which the degree of evasive action the lower tool is used for monitoring. Due to the detection of the evasive dimension, there is an excess Given which, for example, the user zer gives information about whether the immersion depth the jag of the lower part of the article in the flanged edge of the Article top is sufficient. So can be provided be that when a predetermined dimension is exceeded an error message is issued. One is preferred Design in which the piecing machine stopped becomes. Thus, the user is given a signal that carried out riveting to check and if necessary to repeat. In a further development of the counterpart of the invention Standes is further provided that the trajectory of the lower tool is monitored by sensors. Here can For example, a measuring sensor on a in the form of a spring assembly trained pressure compensation of the lower tool brings which measuring sensor in connection with an evaluation circuit is reliable indicate whether the immersion depth of the peaks of the Arti lower part in the flanged edge of the article upper part les is sufficient. This allows conclusions to be drawn about that Pinch setting dimension to be observed, which corresponds to the distance between the top and bottom of the rivet or the like Chen after riveting. Alternatively can be provided that the lower tool at over step a predetermined amount a switch does. This switch can be in the form of a contact or a proximity switch. Is that given? level is observed, then one in the movement switch of the lower tool does not act operated. The riveting is admissible correct pinch setting dimension. However, if a multi-layer fabric, the thickness of which exceed  of the specified dimension, processed, so switch in the path of movement through the Lower tool actuated, for example with a contact switch acted upon. This switch actuation causes before pulls the stop of the attachment device. The Reliable speed of the measuring apparatus is to a large extent from the Calibration after a tool / stamp change, after an article change with a different point length of the Arti lower part or after a flare pressure adjustment dependent. It is therefore necessary, for example, via optical Display and with the help of digital setpoint adjusters to make calibration as simple as possible. So For example, a scale or the like on the device Chen provided, on the basis of which the substation monitoring switches according to the permissible Pinch setting dimension can be aligned. Continue The invention relates to a device in speech standing type, the device feed rails has on which rivet or button parts promoted will. Here is to achieve a safe function sequence provided that at least one feed rail a detection device for monitoring the movement a rivet or button part is assigned. This The device detects the movement of the slipping Article, the recording, for example, via a in the Feed rail integrated switch or the like can be done. However, an embodiment is preferred device in which each feed rail for the article Upper part and the lower part of the article with a light barrier is provided. The one in the course of a preparation cycle slipping articles generated when walking through the Light barrier area a voltage pulse, which can be used if there is no pulse to generate a fault message. This disorder can either caused by a blocking part  or if the rivet stock in the magazine and / or in the feed rail is exhausted. By means of this Establishment is therefore not just the existence monitored by items in the feed rails, but also the movement of the articles in the feed rails. The last point in particular gives conclusions to whether there was an article in the previous piecing cycle part removed from the supervised feed rail has been. If this is not the case, they can also do not slip the following parts. The supervisor chungsimpuls remains, which prefers stopping the Attaching machine causes. According to the invention further provided that in a device of Speaking type, the rivet or button part of the feed rail in the way of a loading slide is changed, the detection device by the measure Removed rivet or button parts from the loading slide is arranged in the feed rail. Due this configuration is an empty run of the respective Feed rail counteracted. Is as a registration direction a light barrier is provided, so is the Light beam preferably perpendicular to the direction of movement of the article, for which purpose in a suitable place in the preferred hardened feed rail a light Passage opening is provided. The can continue Education should be chosen so that for the different Article upper parts (ball or spring part) of these storage magazines separate feed rails parallel are arranged in a continuous manner. To be safe here To ensure monitoring, both rails must be used a preferably designed as a light barrier be provided. However, since only one thing or other article top in one piecing cycle can be processed accordingly the light barrier assigned to the item to be attached  ke activated. In an advantageous development provided that reaching an end position of the Loading slide is monitored during each riveting process. An embodiment in which monitors the front end position of the loading slide is. This is the way between the feed rails and the rivet area, d. H. the area of upper and Lower tool monitored. If, for example, an article in In the course of the conveyance from the feed rails into the Nietbe richly tilted by means of the loading slide, he said the latter does not reach its front end position. This End position is e.g. via a sensor or switch monitors which delivers a signal in the event of a fault, preferably to switch off the device. Due this embodiment is a tappet loading Upper tool in the absence of articles in the Rivet area counteracted. Such an empty rivet could damage the textile, for example to lead. According to the invention in a device type in question, the riveting over a Tappet is provided that the tappet movement over is woken up. In particular, it proves to be advantageous that the monitoring of the plunger movement by means of the movement of a pushing the plunger Ram curve is achieved. For example, a sensor can be used for this purpose "scan" the plunger curve. Monitoring the pestle movement is particularly with regard to the feed rail monitoring is an advantage, since only in a certain given range of a preparation cycle of an article from the feed rail and associated with it The following articles slide down. Detects the sensor or the like of the plunger monitor The area predefined for the feed rails the plunger curve, an evaluation unit expects this Feed rail detector signal. He  there is no signal from the latter device in this area tion, this leads to a standstill of the device tung. Leaves the predefined area of the ram curve the sensor of the ram monitoring, so the feed rail detection devices deactivated. The time Liche dependency between the feed rail signal and the control signal on the plunger curve is indicated by the position of the light barrier to the article in the Zu guide rail fixed. Here is a minimum distance of 30 degrees. In a preferred one Embodiment is provided that on the tappet curve a control switch is arranged. The latter can be in Be designed in the form of a control clock switch, which scans the plunger curve, for example, around the circumference, the cycle-correct signal of the feed rail over monitoring device monitored based on the plunger movement is. The control and monitoring described above Furnishings are both individually and in Kombinati on in a device of the type in question settable.

The invention is further illustrated below with reference to FIG attached drawing, however, only two Ausfü represents examples, explained. Here shows:

Fig. 1 shows the apparatus in a side view, parti ell broken in an upper Todpunktstel lung of the plunger;

Fig. 2 shows a detail of the device of Figure 1 in the area of the lower tool and the upper tool also in the top dead center position of the plunger.

. Fig. 3 is a front view of Figure 1 wherein magazines are presented for the storage of articles parts;

Fig. 4 is a representation corresponding to Figure 1, but with the riveting position testify.

. Fig. 5 is a detail of the device according to FIG 2, but the position according to Fig 4 on.

Fig. 6 is a greatly enlarged view of a is set to a textile rivet;

FIG. 7 shows a further enlargement of a detail from FIG. 5, showing a correct riveting, wherein a boom controlling the lower tool releases a control switch;

Fig. 8 is a representation corresponding to Figure 7, but a riveting not carried out correctly due to too strong textile, the cantilever arm of the lower tool acting on the control switch;

Figure 9 is an enlarged detail of the area of the leading from the magazines to feed rails of the device in a perspective, partly saturated chnittener representation.

FIG. 10 shows a representation corresponding to FIG. 2, but relating to a second embodiment of the monitoring of the lower tool;

FIG. 11 shows a representation corresponding to FIG. 5, but relating to the exemplary embodiment according to FIG. 10;

FIG. 12 shows a representation corresponding to FIG. 11, but in the case of incorrect riveting due to excessive textile thickness.

The device, which is designed in the form of a machine, has a stand 2, supported by a base plate 1 and oriented vertically. The latter is the carrier of a mounting plate 3 which has a U-shape tilted counterclockwise by 90 degrees, the lower U-leg of which represents a bracket 4 .

At its free end, the boom 4 holds a sub tool 5 . The latter has an anvil 6 which is circular in cross section, the upper end of which receives an article lower part 7 .

The article lower parts 7 are stored in a magazine 8 arranged since the mounting plate 3 , from which a feed rail 9 extends obliquely downwards in the direction of the boom 4 . Regarding the article lower parts 7 are jagged holding parts which can be connected to two different article upper parts. An article upper part 10 is shown in the illustrations. It serves as a functional part in the form of a spherical part and can be attached to a textile 11 with the lower part 7 of the article. Both differently designed article upper parts (ball and spring part) come from the magazine 8 opposite magazines 12 and 13 via the respective magazine 12 and 13 associated feed rails 14 and 15 in the area of a loading slide 16th

The loading slide 16 is horizontally displaceable and provided with an upper slide bar 17 and a lower slide bar 18 . The upper insertion bar 17 brings an article upper part 10 into a holding ge 19 while the lower insertion bar 18 moves the article lower parts 7 in alignment with the anvil 6 of the lower tool 5 . By means of a non-illustrated electromagnet control, either one or the other article upper parts from the magazines 12 or 13 can be brought into the movement area of the upper insertion bar 17 via the respective feed rail 14 or 15 .

The holding pliers 19 extends in the starting position of the device in alignment with the lower tool 6 and is carried by a slider which is guided on the lower end of a plunger 20 extending in the opposite direction to the lower tool 5 .

At its lower end, the plunger 20 carries an upper tool 21 , which ends in the upper dead center position of the plunger 20 according to FIGS . 1 to 3 above a receptacle arranged in the area of the holding pliers 19 for the article upper part 10 .

The plunger 20 carries a roller 22 at the upper end. Under the action of a compression spring 23 , the Laufrol le 22 against the circumferential tread of a cam disc 24th This is wedged on the drive shaft 25 of an electromotive drive 26 . During a 360 degree rotation of the cam 24 , the plunger 20 is accordingly shifted in the downward direction and again in the upward direction until the top dead center position. On the plunger 20 , a boom 27 is also attached, which carries a control roller 28 . An arm 29 of a lever 31 mounted on the mounting plate 3 about a pivot pin 30 occurs against the underside of the same. In blunt angled orientation to the arm 29 of the lever 31 forms an obliquely downwardly directed lever arm 32, the sen end proceeds according verti the position in FIGS. 1 to 3 kal and is provided there with a guide slot 33 in which a sliding block 34, a takes hold. The latter is connected to the slider-shaped loading slide 16 , which in turn can be moved in a machine frame-side slide guide 35 when the lever 31 is pivoted.

The lower end of the lever arm 32 forms a Steuerkan te 36 , on which a sensing roller 37 is supported. This is located at the free end of a control lever 38 . This is mounted around a machine-side pin 39 . A tension spring 41 acts on a cross arm 40 of the control lever 38 and loads the control lever 38 in the direction of a contact position with the lever 31 . At the same time, this is forced with its arm 29 into contact with the control roller 28 of the plunger 20 .

In opposition to the sensing roller 37 of the Steuerhe bel 38 forms a disposed near the bolt 39 the control cam 24, which in turn cooperates with a verdre hung secured feeler pin 43, which is guided in a since Lich flaring transverse arm 44 of the transmission lever 45th The feeler pin 43 is supported via a transmission compression spring 46 on a thread-adjusting counter pin 47 at the lower end of the approximately angularly shaped transmission lever 45 . At the top of the angle, the transmission lever 45 is mounted around a cross pin 48 on the boom side. The free end of the transmission lever 45 extends below the lower tool 5 . With an angle piece 49 , the transmission lever 45 positively engages in an annular groove 50 at the lower end of the anvil-shaped lower tool 5 . A near the counter pin 47 attacking return spring 51 loads the transmission lever 45 in such a way that its feeler pin 43 is supported on the control lever 38, namely according to FIGS. 1 to 3 in the area in front of the control curve 42nd

A projection lamp 52 is used to precisely attach the article parts to the textile 11 . This is fixed on the machine side and generates, for example, a crosshair on the top of the textile 11 .

Referring to FIGS. 1 to 3 of the tappet 20 increases due to the correspondingly rotated cam plate 24, the upper death point on position. From the upper insertion bar 17 , an article upper part 10 has been transferred to the holding pliers 19 , while the lower insertion bar 18 has introduced the article lower part 7 into the lower tool 5 .

By actuating a foot switch 53 arranged on the foot plate 1 , the drive starts, connected to a rotation of the cam disk 24 in the direction of the arrow according to FIG. 3, as a result of which the plunger 20 is displaced in the downward direction. As a result, the holding pliers 19 have shifted in the downward direction and are accordingly in a spaced position from the lower tool 5 .

Along with the downward movement of the plunger 20, the control roller 28 acts on the arm 29 of the lever 31 and pivots it counterclockwise, in connection with entrainment of the loading slide 16 with the slide-in strips 17 and 18 seated thereon. The lever arm 32 of the lever 31 acts on the feeler roller 37 of the control lever 38 during this process and pivots it clockwise. Here, the feeler pin 43 comes against the control cam 42 , whereby the transmission lever 45 is pivoted via the transmission spring 46 , so that an upward movement of the lower tool 5 occurs approximately at the same time as the holding pliers 19 and the plunger 20 come to a standstill. During the further course within a Ansetzzyklus causes a second lowering movement of the plunger 20 and the holding forceps 19, a mounting of the holding forceps 19 to the upper side of the fabric. 11 The plunger 20, on the other hand, moves further downward to rivet the lower part 7 of the article to the upper part 10 of the article. Here, the prongs of the lower article part 7 pierce the textile 11 and dip into a flanged edge of the upper article part 10 .

In the course of this riveting process, the lower tool 5 can perform an evasive movement, the extent of this evasive movement being dependent on the textile thickness in the rivet area. This evasive movement is made possible by the non-rigid displacement of the transmission lever 45 . The transmission compression spring 46 acts here as pressure compensation and is compressed in accordance with the extent of the evasive movement.

The specified avoidance dimension is used to monitor the riveting process. For this purpose, a contact switch ter 54 is provided in the first embodiment shown in FIGS. 1 to 9.

The quality of riveting depends essentially on the depth of immersion of the prongs of the lower article part 7 in the flanged edge of the article upper part designed as a ball or spring part. This immersion depth is directly dependent on the textile thickness and the tooth length of the lower part 7 of the article. When riveting, a specified dimension, the so-called pinch setting dimension, must not be exceeded. This measure includes the distance a between the top and bottom of the rivet 55 after riveting has been carried out (cf. FIG. 6). When riveting the lower part of the article 7 and the upper part 10 of the article in single or multi-layer textiles, the lower tool 5 and the associated transmission lever 55 more or less recede. The extent of this soft path can be used as a measure of the strength of the rivet.

The aforementioned contact switch 54 is arranged on the Montageplat te 3 adjustable. Here, the possibility is given to adjust the contact switch 54 in accordance with the maximum pinch setting dimension, for which purpose, for example, a scale or the like can be provided in the area of the mounting plate 3 .

FIGS. 7 and 8 show in schematic diagrams the riveting of two fabrics of different thickness. In Fig. 7, a rivet 55 is placed on a textile 11 , the thickness of which is such that the predetermined ne, depending on the prong length of the article sub-part 7 selected pinch setting dimension is observed. The lower tool 5 and the transfer lever 45 do not chen Chen here or only very slightly back, so that the intended monitoring contact switch 54 is not acted upon by the transfer lever 45 . There is no signal.

In FIG. 8, on the other hand, a textile 11 has been selected, the thickness of which, when using the same lower article part 7 as in FIG . The lower tool 5 and the transmission lever 45 deflect to such an extent that the contact switch 54 is acted upon. This application causes a signal which can be used, for example, via an evaluation circuit to provide the user with an indication of the incorrect riveting via an optical display. In this case, a configuration is preferred in which the signal brings the device to a standstill, for checking and possibly for repeating the riveting carried out.

As an alternative to the contact switch 54 , measuring sensors, proximity switches or the like can also be used. Here there is the possibility of optical calibration and with the help of digital setpoint adjusters to enable the simplest possible calibration. This is particularly important because the reliability of the measuring equipment depends to a large extent on the calibration after changing the stamp, changing the article with a different tooth length or after adjusting the flare pressure.

In the riveted position, the loading slide 16 has also shifted back so far that the slide-in strips 17 and 18 lie in front of the supplied article parts. In this position, the article parts slide automatically into the feed rails, with an article upper part and an article lower part in front of the respective insertion bar. This slipping of the article parts is prevented during the rest of the cycle range, since here the slide-in strips or the loading slide 16 are always in front of the feed rail openings and close them.

The movement of the articles slipping into the feed rails is monitored according to the invention by a detection device 56 . The latter is in the form of a light barrier 57 , with each feed rail 9 , 14 and 15 being assigned a detection device 56 .

These detection devices 56 detect the movement of the slipping articles as soon as a piecing cycle has been triggered. Each attachment cycle here generates a voltage pulse from the slipping article within the area of the detection device 56 . This fact can be used to generate a fault message if there is no pulse. Such a malfunction can either be caused by a blockage of an article part or when the article supply in the feed rail and / or in the magazine is exhausted. Thus, according to the invention, not only is the presence of articles in the feed rails monitored, but also the required movement when the articles slide in the retracted position of the loading slide 16 .

The detection device 56 forming light barriers 57 act approximately perpendicular to the direction of movement of the articles or to the orientation of the feed rails, wherein the passage of the light beam through the feed rails NEN 9 , 14 or 15 these are provided with bottom-side openings 58 .

As already mentioned, one or the other magazine 12 , 13 and thus the associated feed rail 14 or 15 are activated or deactivated by means of an electromagnet control. Along with this, the detection device 56 of the currently valid feed rail is activated, so that error messages from the area of the deactivated feed rail are avoided here.

This feed control continues to work depending on the ram movement. Monitoring is provided here, which is achieved by means of the movement of the cam disk 24 acting on the tappet 20 . On the cam 24 , a single, schematically illustrated control clock switch 59 is provided in the drawings to bring the signal of the detection device 56 of the feed rails in a time or angle-dependent speed to the attachment cycle. The control clock switch 59 sends a signal, for example, to an evaluation unit as soon as the retracted position of the loading slide 16 is detected on the basis of the cam plate 24 . At this time, signals generated by the movement of the articles must also be sent to the evaluation unit by the activated detection devices 56 . The evaluation unit checks the received signals and preferably stops the entire attaching device in the event of fault messages.

Alternatively, you can use the cam disc position proximity switches or sensors are also used come.

The detection devices 56 in the area of the feed rails are positioned so that a measure of several article parts between the detection devices 56 and the loading slide 16 is maintained. This ensures that the feed rails do not run completely empty. There is always a residual amount in the area between the detection devices 56 and the loading slide 16 .

The supply of the lower part 7 and upper part 10 of the article into the area of lower tool 5 and upper tool 21 is also monitored. For this purpose, for example, a sensor 60 is arranged on the mounting plate side, which sensor 60 detects the front end position of the loading slide 16 or the associated front end position of the lever arm 32 . If, for example, an article part becomes jammed in the course of the forward movement of the loading slide 16 , this leads to the loading slide 16 and lever arm 32 coming to a standstill. The latter therefore does not reach the area of the monitoring sensor 60 which supplies a signal in the event of a fault. This signal preferably leads to a standstill of the attachment device.

The monitoring devices described above can both individually and in combination in the front direction.

Furthermore, the signals of the pinch stetting measurement monitoring and the loading slide monitoring can be monitored in accordance with the cycle by means of the control disc switch 59 using the cam disc position.

In Figs. 10 to 12, an alternative embodiment of the pinch-Setting- is level-monitoring schematically illustrated in a further embodiment. Here, a linear displacement of a disengaging part 61 is effected by means of a control cam 42 in order to shift the lower tool 5 into the rivet position. The latter is preceded by a transmission compression spring 63 directed in the direction of a transmission lever 62 , which is supported at the end opposite the disengaging part against a plate 64 on the transmission lever side. A signal finger 65 passing through the compression spring 62 and the disengaging part 61 is integrally formed on this plate 64 . The free end region of this signal finger 65 plunges into the detection region of a sensor 66 arranged on the machine side.

In Fig. 11, a rivet position is shown in which the predetermined pinch setting dimension is maintained due to the permissible textile thickness. The directly connected via the plate 64 to the transmission lever 63 Si signal finger 65 has left the detection area of the sensor 66 with its free end. There is therefore no signal.

In Fig. 12, a rivet is to be attached to a textile, the thickness of which causes the specified pinch setting dimension to be exceeded. The lower tool 5 and the associated transmission lever 63 yield during the riveting process due to the excessive textile thickness. The compression spring 62 is compressed between the non auswei sponding Ausrückteil 63 and the plate übertragungshebelseiti gen 64th The molded on the plate 64 te signal finger 65 , however, shifts towards the detection range of the sensor 66 , which in this constellation sends a signal to switch off the device or at least to display to the user.

All the features disclosed are essential to the invention. In the disclosure of the application is hereby also the Disclosure content of the associated / attached priori full documents (copy of the pre-registration) Lich included, also for the purpose of characteristics of this Documents in claims of the present registration with to record.

Claims (12)

1. Device for attaching rivets, buttons or the like with an upper tool ( 21 ) and a lower tool ( 5 ), wherein the upper tool ( 21 ) is preferably pressurizable and a tool performs an evasive movement in the course of the riveting process, characterized in that the dimension the evasive movement is used to monitor the riveting process. 2. Device according to claim 1 or in particular since, characterized in that the extent of the evasive movement of the lower tool ( 5 ) is used for monitoring ge. 3. Device according to one or more of the preceding claims or in particular according thereto, characterized in that the movement path of the lower tool ( 5 ) is monitored by sensors. 4. Device according to one or more of the preceding claims or in particular according thereto, characterized in that the lower tool ( 5 ) actuates a switch ( 54 ) when a predetermined dimension is exceeded. 5. The device according to one or more of the preceding claims or in particular according thereto, wherein the device has feed rails ( 7 , 14 , 15 ) on which rivet or button parts ( 7 , 10 ) are conveyed, characterized in that at least one Feed rail ( 7 , 14 , 15 ) is assigned a detection device ( 56 ) for monitoring the movement of the rivet or button part ( 7 , 10 ). 6. The device according to one or more of the preceding claims or in particular according thereto, wherein the rivet or button part ( 7 , 10 ) is conveyed from the feed rail ( 9 , 14 , 15 ) into the path of a loading slide ( 16 ), characterized in that that the detection device ( 56 ) is arranged in the feed rail ( 9 , 14 , 15 ) by a measure of several rivet or button parts ( 9 , 10 ) from the loading slide ( 16 ). 7. The device according to one or more of the preceding claims or in particular according thereto, characterized in that the reaching of an end position of the loading slide ( 16 ) is monitored with each riveting process. 8. The device according to one or more of the preceding claims or in particular according thereto, characterized in that the front end position of the loading slide ( 16 ) is monitored. 9. The device according to one or more of the preceding claims or in particular according thereto, the Ver riveting via a plunger ( 20 ), characterized in that the plunger movement is monitored. 10. The device according to one or more of the preceding claims, in particular according thereto, characterized in that the monitoring of the tappet movement by means of the movement of the tappet ( 20 ) acting on the tappet curve ( 24 ) is achieved. 11. The device according to one or more of the preceding claims, in particular according thereto, characterized in that a control switch ter ( 59 ) is arranged on the plunger curve ( 24 ). 12. The device according to one or more of the preceding claims, in particular according thereto, characterized in that the cycle-appropriate signal of the feed rail monitoring device ( 56 ) is monitored on the basis of the tappet movement.