EP1618441A1

EP1618441A1 - Method and device for controlling a production unit

Info

Publication number: EP1618441A1
Application number: EP04714312A
Authority: EP
Inventors: Wolfgang Linke
Original assignee: Focke and Co GmbH and Co KG
Current assignee: Focke and Co GmbH and Co KG
Priority date: 2003-04-25
Filing date: 2004-02-25
Publication date: 2006-01-25
Also published as: DE10319064A1; US7298111B2; WO2004097538A1; BRPI0409668A; US20060267536A1

Abstract

Disclosed are a method and a device for controlling a production unit in a production facility, controlling referring to controlling and monitoring the rotational speeds or angles of rotation of individual drive units (20-22) such that the movement thereof relative to a synchronous value (37) and/or a threshold value (33) is monitored. Threshold value (33) monitoring results in a safely limited speed of the individual drive units while synchronous value (37) monitoring allows aynchronisms to be recognized. The monitoring process can be carried out during normal operation and/or during setup operation. During setup operation, said monitoring process is used especially for protecting operators from drive units (20-22) that start suddenly or run too fast.

Description

Method and device for controlling a manufacturing unit

description

The present invention relates to a method and a device for controlling a manufacturing unit of a production plant. The production plant mentioned is in particular a production and packaging plant, preferably one for cigarettes or other smoking articles. Such a system comprises a number of different, but combined in the manufacturing and packaging process manufacturing units, e.g. a cigarette manufacturing machine (maker), a packaging machine (packer), a foil wrapping machine (cello) and, if necessary, a packer and a carton packer. The coordination of the speeds within the individual production units takes place with regard to a speed of a central drive of the respective production unit, which is also referred to as a master drive or master shaft. The speeds of all other drives (slave drives) of the production unit are derived from the speed of the master shaft.

In the event of service, an intervention in the production system or an individual production unit is required. In the event of such an intervention, the system or the manufacturing unit is generally shut down. However, it may be necessary for the system or production unit, hereinafter referred to collectively as the system, to be put back into operation at a controlled speed during the intervention, e.g. also access to otherwise hidden sections of individual units, e.g. to enable a section of a revolver in the area of the film wrapping machine. So far, this has been achieved by the system or a central part of the system having a protective device, e.g. is covered in the form of a hood. The hood must be opened to intervene in the system. When the hood is opened, the system comes to a standstill. The master shaft can now be moved further with a handwheel. The given speed of the master shaft influences the speed of the dependent drives. Even with a comparatively low speed of the master shaft, a high speed can result for individual dependent drives. For this reason, all dependent drives are each secured by an additional hood - a "hood in the hood", so to speak. When a hood of a dependent drive is opened, the further movement of the master shaft is blocked.

BESTÄTIGUNGSKÖPIE The object of the invention is therefore to provide a simple and safe method for controlling a production unit and a device for carrying it out. In particular, an intervention in the system should be possible while maintaining the possibility of moving the central drive and dependent drives.

The object is achieved with a method with the features of claims 1, 2, 3 or 4 and with a device with the features of claims 13, 14, 15 or 16. Thereafter, monitoring of limit values, namely speed or position-related limit values such as limit speeds or synchronous rotary positions, is provided.

The monitoring of the limit speeds comes into play when generating speed setpoints (soil speeds) for the individual drives. Furthermore, the speed actually reached can be monitored with regard to a limit speed (safely limited speed). The actual speed of the individual drives can also be monitored with regard to the respective target speed, because the synchronism of the individual drives with each other and with the central drive can only be guaranteed if the target speed is exactly maintained (synchronous speed).

The monitoring of the synchronous rotary positions is basically analogous to the monitoring of the limit or synchronous speeds, only the rotary positions of the respective drives, i.e. the angular positions, are monitored instead of the speeds. This is useful for dependent drives that, for example, do not perform a full revolution but instead perform oscillating movements or the like. Even in the case of dependent drives that make full revolutions, the monitoring of the rotational position and the comparison of the respective rotational position with the rotational position of the central drive enables the best possibility for monitoring the synchronicity of the movement of the respective dependent drive with the corresponding movement of the central drive. The actual position of the individual drives can also be monitored with regard to a limit value that corresponds functionally to the limit speed during speed monitoring. Such a limit value specifies a tolerance range in the vicinity of the respective target position, because exact positional synchronism is often not practically possible can be realized. The tolerance range specified by the limit value can be adapted, that is, reduced or enlarged, by changing the limit value. Because of the basic analogy of a limit value in the form of a limit speed and a limit value in the form of a position-related tolerance range, both are briefly referred to below as limit values.

A special feature of the method according to the invention is that in the event of an intervention in the system, which is carried out by opening a protective device, e.g. a hood or the like is recognized, a related signal (hood signal) is generated and this signal is used to reduce the speed, in particular the speed of the central drive, so that the drives automatically run slower in the event of such an intervention. Reducing the speed of the central drive automatically results in a corresponding reduction in the speed of the dependent drives. This changed movement pattern can also be monitored by reducing the respective limit values accordingly. A reduction in the limit value for the central drive ensures that this - if for any reason a speed above the respective target speed is reached - is stopped or switched off at least when the speed specified by the limit value is reached. In the case of the dependent drives, a corresponding reduction in the limit values means that if the specified target speed is exceeded, this limit can only reach a speed which is specified by the limit value. There is therefore a safe limitation of the speed, so that sufficient safety for the operating personnel is ensured.

Another special feature of the invention is that speed information is evaluated on the basis of a speed or an angle of rotation of the central drive (master shaft speed or angle) in such a way that at a master shaft speed with the value zero the limit value for the drives, in particular the limit value for the dependent drives, is also set to zero or kept at zero. This prevents incorrect start-up of dependent drives (safe stop) and thus increases safety for the operating personnel. Finally, a special feature of the invention is that the safely limited speed that is achieved is also guaranteed during normal operation of the system. Asynchrony between the dependent drives or with respect to the master drive can also be avoided in normal operation.

Further special features of the invention are explained in more detail below with reference to the drawings. It shows:

Fig. 1 is a schematic representation of a production plant, Fig. 2 is a schematic representation of an effective chain for individual drives of the system and Fig. 3 is a schematic representation of the effective chain with integrated in the effective chain

Master drive.

The embodiment shown in the drawings relates to a manufacturing and packaging system for cigarettes as a production system. This usually comprises a number of production units, for example a cigarette manufacturing machine, namely a maker, a packaging machine connected to this, a packer, a subsequent film wrapping machine (cello) 10, a packaging machine for producing packs from several cigarette packs, that is to say a packer and a cartoner , the packaging, i.e. cigarette sticks, packed in a shipping carton. Cigarettes manufactured by the maker are fed to the packer, which is intended for the production of folding boxes for holding the cigarettes. The cigarette packs produced by the packer, that is to say the combination of a folding box and the cigarettes located therein, are fed to the film wrapping machine 10. This has the task of wrapping the cigarette packs in a foil or plastic blank. Packing groups are formed from the finished cigarette packs, which are provided with a container wrapping in the area of the packer and thus result in a cigarette pack of usually ten packs of cigarettes. These cigarette sticks are fed to the cartoner by a bar conveyor, which hands over finished shipping boxes with a plurality of cigarette sticks to a removal conveyor. Each of these manufacturing units includes one or more drives. Among these drives, one takes on the function of a central drive, master drive 11. On the speed of the master drive 11 or the respective angle of rotation, the speeds or angles of rotation of all other drives (dependent drives) are derived directly or indirectly. Possibly. For this purpose, predetermined or predeterminable movement laws are taken into account, which mathematically describe, for example, an oscillating movement of a dependent drive in synchronism with a rotary movement of the master drive 11 or the like.

The film wrapping machine 10 is shown as a section of the system in a side view. The (hidden) master drive 11 is shown in dashed lines. To protect the operating personnel, the film wrapping machine 10 has a central hood 12 which can be opened by means of a handle 13. The central hood 12 covers an assembly 14 with its own drive, a dependent drive 20. The assembly 14 is a knife block. The unit is covered with a hood 15 (hood in the hood) provided within the central hood 12. The hood 15 is shown in the closed state, the open state being illustrated by dashed lines. The hood 15 can only be opened if the central hood 12 has been opened beforehand. Finally, a handwheel 16 is shown which, when the central hood 12 is closed, is not accessible or cannot be actuated. The master drive 11 can be rotated with the handwheel 16. The manufacturing unit may include other dependent drives, not shown in detail. Other dependent drives can be part of other manufacturing units, such as the maker and / or the packer.

Fig. 2 shows a schematic representation of an effective chain for individual drives 20, 21, 22 of the system. The drives 20-22 are dependent drives. They are briefly referred to below as drives 20-22. A servo actuator 23, 24, 25, hereinafter referred to as servo 23, 24, 25, is assigned to each drive 20-22, and a speed and / or angle of rotation sensor is assigned to the measurement sensor 26, 27, 28. The or each servo 23-25 specifies a target value 29 for the respective drive 20-22, in particular in the form of a target speed or a target rotation angle. The actual movement of each drive 20-23 is determined with the measurement transducer 26-28 respectively assigned to the drive 20-23 and transmitted to a comparator 31 as the actual value 30, in particular as the actual value of the instantaneous speed or as the actual value of the current position, i.e. the angle of rotation , The comparator 31 is provided for comparing the setpoint and actual value 29, 30 for each drive. Each servo 23-25 includes at least one input at which a speed or an angle of rotation of the master shaft, hereinafter referred to collectively as master shaft specification 34, can be transmitted to it. From the master shaft default 34 of the servo 23-25 derives a velocity or position command and transmits this as a nominal value 29 in the form of a speed or rotation angle commands to the respective drive 20 ^'23rd

To derive the target value 29, not only the master wave specification 34 but also a limit value 33 is used, which is either stored in a memory 35 of the respective servo 23-25 or is transmitted to it in the form of a limit value signal 36. The limit value 33 is taken into account by the servo 23-25 in such a way that the target value 29 never exceeds the limit value 33. The storage of the limit value 33 in the memory 35 or its transmission as a limit value signal 36 can alternatively or simultaneously exist. Limit value 33 and limit value signal 36 are also referred to below as “safe value”. In the variant that safe value is either only stored in memory 35 as limit value 33 or is only transmitted as limit value signal 36, the respectively available value is used to derive setpoint value 29 In the variant in which the safe value is both stored in the memory 35 and transmitted as a limit value signal 36, it is conceivable that the limit value 33 stored in the memory 35 acts as an upper limit, so that the limit value signal 36 for deriving the Setpoint value 29 is used as long as limit value signal 36 remains below limit value 33, and that in the case of a limit value signal 36 above limit value 33, limit value 33 stored in memory 35 is always used to derive setpoint value 29. Of course, the reverse is the case or obvious variants conceivable.

The master shaft specification 34 is removed in a manner not shown either from the master shaft itself or from the handwheel 16, for example with a transducer coupled to the master shaft or the handwheel 16, for example an incremental encoder. The removal of speed or position information from the handwheel 16 is only provided in the set-up mode because in normal operation the handwheel 16 is not accessible for actuation, since it is covered by the central hood 12. Next is the removal of information from the handwheel 16 only then provided if the handwheel 16 does not act directly but only indirectly, for example via an electronic gear, on the master shaft.

The setpoint value 29 derived from the master shaft specification 34 is supplied not only to the respective drive 20-22 but also to the comparator 31. Each setpoint 29 is stored as a synchronous value 37 in the memory 32 of the comparator 31. In operation, the comparator 31 can compare the actual value 30 recorded for each drive 20-22 with the respective synchronous value 37. If the actual value 30 of a drive 20-22 exceeds the respective synchronous value 37, a corresponding stop signal 38 is generated, which either switches off all the drives 20-22 or the drive 20-22 that no longer runs synchronously, in particular additionally also the master drive 11. Additionally or alternatively, it can be provided that the stop signal 38 is generated not only when the synchronous value 37 is exceeded, but that the stop signal 38 is generated when the actual value 30 leaves a predetermined or predefinable range around the synchronous value 37. Then, for example, asynchrony can also be recognized by drives 20-22 that are incorrectly running too slowly. In addition, the individual actual values 30 are also monitored with respect to the limit value 33, ie the limit value 33 forms an upper limit which must not be exceeded even if the setpoint 29 specifies this. If the limit value 33 is exceeded, the stop signal 38 is therefore also triggered. The limit value 33 can be an upper limit common to all drives 20-22 or can be set individually for each drive. The limit value 33 is then a field of possibly different individual speed upper limits or position tolerance ranges. The or each stop signal 38 is passed through a display device 39 which, for example, provides information about the drive 20-22 causing the error via optical display elements (not shown), such as a screen, in particular with plain text display or indicator lights. Instead of the situation shown, a separate comparator can also be provided for each drive 20-22. Each of these comparators then has its own memory in which at least the limit value 33 specified for the respective drive 20-22 and the current synchronous value 37 are stored. The stop signal 38 possibly generated by such an individual comparator is either supplied individually to the respective drive 20-22 or to all drives 20-22, in particular also to the master drive 11. In normal operation of the system - that is, during ongoing production - the synchronism of the individual drives 20-22 with one another and with the master drive 11 can be ensured in this way. This is done by monitoring the synchronous value 37. Furthermore, it can be ensured that none of the drives 20-22 exceeds a predetermined or predefinable upper limit, for example an upper speed limit. This is done by monitoring limit value 33.

In the event of an intervention in the system, e.g. Monitoring of the movement of the individual drives 20-22 is also required for maintenance or inspection purposes, that is to say in a so-called setup operation. Set-up mode differs from normal mode in that drives 20-22 run at a significantly reduced speed. This is achieved by reducing the speed of the master shaft in set-up mode. The speed of the master shaft is determined by the handwheel 16 or an otherwise suitable adjusting device, e.g. a variable resistance, ie a potentiometer or the like, can be specified. When using a handwheel 16 acting directly on the master shaft, the speed of the master shaft is limited due to the limited physical force of the operator operating the handwheel 16. When using an only indirectly, e.g. via an electronic gear, handwheel 16 coupled to the master shaft or when used e.g. a potentiometer instead of the handwheel 16, the speed of the master shaft is limited by suitable monitoring of limit values. This is explained below in connection with FIG. 3.

An intervention in the system is only possible when the central hood 12 is open. That is, there is a hood signal 40 at least from the central hood 12. When hood signal 40 is present, limit value 33 is reduced. This can be done by storing in the memory 32 of the comparator 31 and in the memory 35 of the respective servo 23-25 a limit value 33 for normal operation on the one hand and a limit value for set-up operation on the one hand and the respective limit value depending on the status of the hood signal 40 33 is selected. Alternatively, it is possible, for example, for limit value 33 to be reduced in a defined manner in set-up mode, that is to say when hood signal 40 is present, which can easily be achieved, for example, by a mathematical or logical operation (division or shift operation). Finally, it is also conceivable that the limit value signal 36 is reduced in a defined manner when the hood signal 40 is present. In setup mode, this results from the reduced speed of the master shaft also reduced setpoints 29 for the drives 20-22. Compliance with the setpoints 29 is ensured by monitoring the synchronous value 37 by the comparator 31 in the same way as in normal operation. The limitation of the movement of the drives 20-22, that is to say the safe avoidance of a rotational speed or a position outside the range predetermined by the limit value 33, is likewise ensured in the same way as in normal operation.

To limit the speed of the master shaft, the master drive 11 itself is integrated into the knitting chain according to FIG. 2. The resulting conditions are shown in Fig. 3. The master drive 11, like the dependent drives 20-22, is assigned its own measurement sensor, the master shaft measurement sensor 41. The rotational speed or the rotational position of the master shaft, like the rotational speed or the rotational position of the dependent drives 20-22, is recorded as the actual value 30 and fed to the comparator 31. Upstream of the master drive 11 is a master shaft servo 42, which offers the same functionality as the servos 23-25 of the dependent drives 20-22, i.e. A specification, in particular a speed specification, is determined from an input signal 43 and is forwarded to the master drive 11 as a master shaft specification 34. The input signal 43 is derived from the handwheel 16 or from an otherwise suitable adjusting device. The master shaft specification 34 is simultaneously the input of the servos 23-25 of the dependent drives 20-22. When determining the master wave specification 34, a master wave limit value 45 stored in a memory 44 of the master wave servo 42 is taken into account such that the master wave specification 34 never exceeds this master wave limit value 45. That If the master wave specification 34 is calculated, each value for the master wave specification 34 above or outside the master wave limit value 45 is discarded and the master wave limit value 45 itself is used instead. When the hood signal 40 is present, the master wave limit value 45 can be reduced in exactly the same way as the limit value 33 of the servos 23-25, so that a reduction in the master wave specification 34 can be brought about immediately in the event of an intervention in the system.

By monitoring the limit value 33 and the synchronous value 37, the system can be operated with a safely limited movement with regard to position and or speed, both in normal and in set-up mode. A safe standstill (safe stop) of the drives, especially the master drive 11 and dependent drives 20-22, is possible by supplying the master shaft specification 34 or the input signal 43 of the master shaft to the comparator 31. 2 shows that the master wave setting 34 is not only supplied to the servos 23-25 but also to the comparator 31. In the comparator 31, the respective value of the master wave specification 34 has the effect that the currently set limit value 33 is used for a master wave specification 34 not equal to zero and the limit value 33 itself is set to zero for a master wave specification 34 equal to zero. If the master drive 11 is integrated into the active chain, as shown in FIG. 3, the comparator 31 is also supplied with the master shaft specification 34, but in a particularly preferred embodiment also with the input signal 43. In this constellation, the limit value 33 is set to zero if either the master wave specification 34 or the input signal 43 is equal to zero. This also takes into account any errors when determining the master shaft specification 34 in the master shaft servo 42 from the input signal 43. With a limit value 33 equal to zero, the starting of each drive, that is to say the dependent drives 20-22 or the dependent drives 20-22 including the master drive 11 , is reliably prevented because the comparator 31 switches off the respective drive or all drives immediately by means of a corresponding stop signal 38 with each movement of a drive and an actual value 30 that is therefore non-zero for this drive.

In a preferred embodiment, the or each sensor 26-28, in particular also the master shaft sensor 41, can be designed as a combined movement sensor and torque sensor or as a combination of a separate sensor for recording movement information, i.e. position and / or speed, and a separate torque sensor his. Correspondingly, at least limit value 33 then includes a speed-related or position-related limit value on the one hand and a torque-related limit value on the other hand. In this way, damage to the system can also be avoided if the drives, especially the master shaft, are blocked.

An advantage of the invention is that it is possible to save the safety devices previously required for the dependent drives, ie the hoods or the like. On the other hand, there is also an advantage of the invention in that, in the case of safety devices still present on individual dependent drives, a speed coordinated with signals from these safety devices reduction in speed is possible, e.g. in such a way that when the central hood 12 is open, the speed of the central drive is reduced by, for example, 90%, and if another specific hood is additionally opened, the speed is reduced again by another 50%, for example, when another hood is opened, one repeated speed reduction, for example by a further 30%, etc. Such combinations and combinations can easily be stored in the comparator 31 and / or in the servo 23-25 and possibly also in the master shaft servo 42.

In summary, the invention can be described as follows: A method and a device for controlling a production unit in one

Production plant specified, the control system being based on a control system and

Monitoring of rotational speeds or angles of rotation of individual drives 20-22 relates in such a way that their movement is monitored according to position and / or speed with respect to a synchronous value 37 and / or a limit value 33. The monitoring with regard to the limit value 33 leads to a surely limited one

Movement of the individual drives. Monitoring with regard to the synchronous value

37 enables the detection of asynchrony. Monitoring can be done in

Normal operation and / or in set-up operation are carried out and serves in

Set-up operation especially to protect the operating personnel against suddenly starting or too fast drives 20-22.

LIST OF REFERENCE NUMBERS

10 film wrapping machine 39 display device

11 central drive 40 hood signal

12 central hood 41 master wave transducers

13 handle 42 master shaft servo

14 unit 43 input signal

15 hood 44 storage

16 Handwheel 45 master wave limit

17 -

18 -

19 -

20 drive

21 drive

22 drive

23 servo actuator (servo)

24 servo actuator (servo)

25 servo actuator (servo)

26 sensors

27 sensors

28 sensor 9 setpoint

30 actual value

31 comparators

32 Memory 3 limit

34 Master wave specification 5 memory 6 limit signal 7 synchronous value 8 stop signal

Claims

claims

1. A method for controlling a manufacturing unit with at least one primary drive (master drive 11) and at least one dependent drive (20-22), the movement of which depends directly or indirectly on the movement of a master shaft of the master drive (11), characterized in that the dependent Drive (20-22) is assigned to each servo actuator (23-25) that the servo actuator (23-25) determines a setpoint (29) for the dependent drive (20-22) from an input signal and forwards it to it and that at When determining the setpoint (29), a limit value (33), in particular stored in the servo actuator (23-25), is taken into account.

2. The method according to the preamble of claim 1, characterized in that a measurement sensor (26-28) is associated with the dependent drive (20-22), that a movement of the dependent drive (20-22) by the measurement sensor (26- 28) recorded and transmitted as an actual value (30) to a comparator (31) and that the comparator (31) compares the actual value (30) with a limit value (33) stored in particular in the servo actuator (23-25) and in the event of a deviation generates a stop signal (38).

3. The method according to the preamble of claim 1, characterized in that the dependent drive (20-22) each have a servo actuator (23-25) and a transducer (26-28) assigned to the servo actuator (23-25) an input signal determines a target value (29) for the dependent drive (20-22) and forwards it to this and to a comparator (31) that movement of the dependent drive is detected by the measured value sensor (26-28) and used as actual value (30) is transmitted to the comparator (31) and that the comparator (31) compares the target value (29) with the actual value (30) and generates a stop signal (38) in the event of a deviation.

4. The method according to the preamble of claim 1, characterized in that the dependent drive (20-22) each have a servo actuator (23-25) and one

Measurement sensors (26-28) are assigned so that the servo actuator (23-25) determines a target value (29) for the dependent drive (20-22) from an input signal and forwards it to this and to a comparator (31) that at Determination of the target value (29), in particular a limit value (33) stored in the servo actuator (23-25) is taken into account that movement of the dependent drive is detected by the measurement sensor (26-28) and sent to the comparator (31) as actual value (30) is transmitted and that the comparator (31) compares the actual value (30) with a limit value (33) stored in particular in the servo actuator (23-25) and / or with the target value (29) and in the case of a

Deviation generates a stop signal (38).

5. The method according to claim 1, 3 or 4, characterized in that the input signal of the servo actuator (23-25) is information regarding a rotational speed or an angle of rotation of the master shaft (master shaft specification 34).

6. The method according to claim 2, 3 or 4, characterized in that the actual value (30) is stored in a memory (32) of the comparator (31) as a synchronous value (37), and that the comparison with the actual value (30) refers to the stored synchronous value (37).

7. The method according to any one of the preceding claims, characterized in that a separate synchronous value (37) and / or a separate limit value (33) is stored in the comparator (31) for each dependent drive (20-22).

8. The method according to any one of the preceding claims, characterized in that the master drive (11) is assigned its own servo actuator (master shaft servo 42) and its own measured value sensor (master shaft measured value sensor 41). that for the master drive (11) from an input signal (43) of the master shaft servo (42) a specification (master shaft specification 34) for the master drive (11) is determined and fed to the comparator (31) and that the comparator (31) detects one of the master shaft measurement sensors ( 41) compares the recorded actual value (30) with a limit value (33) stored in particular in the servo actuator (23-25) and / or with the master wave specification (34) and generates a stop signal (38) in the event of a deviation.

9. The method according to claim 8, characterized in that a limit value (33) stored in the master wave servo (42) is taken into account when determining the master wave specification (34).

10. The method according to claim 8 or 9, characterized in that the master shaft specification (34) an input of the servo actuator (23-25) of the dependent drive (20-22) is supplied.

11. The method according to one or more of the preceding claims, characterized in that the servo actuator (23-25), possibly also the master shaft servo (42), and / or the comparator (31) is supplied with a hood signal (40), which at an intervention in the production system is triggered, and that when the hood signal (40) is present, the limit value (33) in the servo actuator (23-25) and / or in the comparator (31), possibly also a master wave limit value (45) in the master shaft servo (42) , is reduced.

12. The method according to one or more of claims 2 to 1 1, characterized in that the input signal of the servo actuator (23-25), in particular the

Master wave specification (34) is fed to the comparator (31) and that the limit value (33) is set or held at zero as long as the input signal or the master wave specification (34) has the value zero.

13. Device for controlling a production unit with at least one primary drive (master drive 11) and at least one dependent drive (20-22), the movement of which depends directly or indirectly on a movement of a master shaft of the master drive (11), characterized in that a servo actuator (23-25) is assigned to the dependent drive (20-22), so that the servo actuator (23-25) can determine and supply a setpoint (29) for the dependent drive (20-22) from an input signal and that the setpoint (29) is limited by a limit value (33) stored in particular in the servo actuator (23-25).

14. The device according to the preamble of claim 13, characterized in that the dependent drive (20-22) is associated with a respective measuring sensor (26-28) that through the measuring sensor (26-28) a movement of the dependent drive (20- 22) can be recorded and transmitted as an actual value (30) to a comparator (31) and that the comparator (31) for comparing the actual value (30) with a limit value (33) stored in particular in the servo actuator (23-25) and for generating a Stop signal (38) is provided in the event of a deviation.

15. The device according to the preamble of claim 13, characterized in that the dependent drive (20-22) each have a servo actuator (23-25) and a transducer (26-28) assigned by the servo actuator (23-25) a setpoint (29) for the dependent drive (20-22) can be determined from an input signal and can be fed to this and a comparator (31) such that a movement of the dependent drive (20-22) can be detected by the measured value sensor (26-28) and can be transmitted as an actual value (30) to the comparator (31) and that the comparator (31) is provided for comparing the actual value (30) with the target value (29) and for generating a stop signal (38) in the event of a deviation.

16. The device according to the preamble of claim 13, characterized in that the dependent drive (20-22) each have a servo actuator (23-25) and a sensor (26-28) assigned to it by the servo actuator (23-25) A setpoint (29) for the dependent drive (20-22) can be determined from an input signal and can be supplied to the drive (20) and to a comparator (31). that the setpoint (29) is limited by a limit value (33) stored in particular in the servo actuator (23-25), that a movement of the dependent drive (20-22) can be detected by the measured value sensor (26-28) and as an actual value (30) can be transmitted to the comparator (31) and that the comparator (31) for comparing the actual value (30) with a limit value (33) stored in particular in the servo actuator (23-25) and / or the target value (29) and for generating a stop signal (38) is provided in the event of a deviation.

17. The apparatus of claim 13, 15 or 16, characterized in that the input signal is information regarding a rotational speed or an angle of rotation of the master shaft (master shaft specification 34).

18. The apparatus of claim 14, 15 or 16, characterized in that the actual value (30) in a memory (32) of the comparator (31) as a synchronous value (37) can be stored, and that the comparison with the actual value on the stored Synchronous value (37) relates.

19. Device according to one of claims 13 to 18, characterized in that in the comparator (31) for each dependent drive (20-22) a separate synchronous value (37) and / or a separate limit value (33) can be stored.

20. Device according to one of claims 13 to 19, characterized in that the master drive (1 1) is assigned its own servo actuator (master shaft servo 42) and its own sensor (master shaft sensor 41) that for the master drive (11) from an input signal ( 43) of the master shaft servo (42), a specification (master shaft specification 34) for the master drive (11) can be determined and fed to the comparator (31) and that the comparator (31) for comparing an actual value (30) of the master drive that can be recorded by the master shaft measurement sensor (41) (11) with a limit value (33) which can be stored in particular in the servo actuator (23-25) and / or with the master shaft specification (34) and for generating a stop signal (38) in the event of a deviation.

21. The apparatus according to claim 20, characterized in that the master wave specification (34) is limited by a limit value (33) stored in the master wave servo (42).

22. The apparatus of claim 20 or 21, characterized in that the master shaft specification (34) an input of the servo actuator (23-25) of the dependent drive (20-22) can be fed.

23. The device according to one or more of the preceding claims, characterized in that the servo actuator (23-25), possibly also the master shaft servo (42), and / or the comparator (31) has a hood signal which can be triggered when an intervention occurs in the production system ( 40) and that, depending on a status of the hood signal (40), the limit value (33) in the servo actuator (23-25) and / or in the comparator (31), possibly also a master wave limit value (45) in the master wave servo (42) , can be reduced.