DE202010017960U1 - Protection system for operating safety on machines, in particular press bending presses - Google Patents

Abstract

Protection system for operating safety on a machine, in particular a press bending press (1), with a movable first tool part (4), which has a working movement (15) in the direction of a second, preferably stationary, tool part (7) for a machining operation on a workpiece (10). and a control system (9), wherein the protection system (2) comprises a primary traveling protective device (17) for monitoring a first protection area (11) between the tool parts (4, 7) which is adjustably associated with the movable first tool part (4) and that the protection system (2) is in communication with the control system (9) of the machine, characterized in that the protection system (2) is provided with a secondary protection device (18) for monitoring and eliminating bruises between the machine moving during processing Workpiece (10) and the movable first tool part (4) and / or its cheek (3) in a second protection area (33) is provided, w which is in control connection with the control system (9) of the machine (1).

Description

FIELD OF THE INVENTION

The present invention relates to a protection system for operating safety on a machine, in particular a press brake, in order to prevent injury to operators in the operation of the machine.

STATE OF THE ART

As is known, the press bending presses are mostly used in sheet metal forming. The press-bending presses usually have a movable upper tool as a movable first tool part and a lower tool as a second tool part, which is usually stationary, and a protective device for operating safety. The second tool part typically has a recess in its cross-sectional profile so that it forms a "die" into which the first tool part can dip during the bending process in order to deform the workpiece. In one variant, the "die" is also installed on the movable upper part.

Such a security device is z. B. from the DE 10 2004 020 024 A1 known. This safety device has a light emitter that emits a beam of light. This light beam illuminates a light receiver. The light emitter and the light receiver together form a light barrier which monitors a protective area on the lower edge of an upper tool as the first tool part. This light barrier is carried along in the working movement of the first tool part in order to detect the dangerous intervention of an object (tool, workpiece part, hand of the operator, etc.) in the working path of the first tool part.

As soon as an intervention in the protection area is detected, the traveling protection device generates signals for the press control, which lead to the shutdown of the press brake. If necessary, measured values can also be determined by means of the abovementioned safety device, which are related to individual workpiece or tool areas. These measured values are to be determined on the basis of a shadow crack which generates the workpiece or the tool on the photosensitive elements (picture elements) of the image sensor.

In the US 6,131,429 A Another protection system for presses is described. This protection system has a gate, which is pivotally mounted on the movable cheek on the first tool part and which is associated with a sensor. The gate is in its first position covering the first tool part from below when the tool is further from the second tool part than a preselected distance, and it is in its dumped second position when the tool is closer to the second tool part than the preselected one Distance is. The sensor is electrically connected to the press brake control to stop the press brake when in danger.

The known moving protective devices are arranged on the machines so that they can be manually or electrically adjusted by hand. Stand today are manual or "semi-automatic" systems.

However, these guards protect directly only from bruising with the first tool part.

A disadvantage of the known protection devices is that they must be reset by the operator at each tool change. This can lead to misconceptions that are made consciously or unconsciously, which is no longer acceptable from the point of view of product quality.

Another disadvantage of the cited solutions is seen to be precisely during the most critical phase, i. H. during the actual bending process are no longer active. It has been proven that most bruising injuries are caused by the moving plate and the tool or the cheek of the moving part of the tool. Thus, there is still an interest in improving the operating safety of generic machines in practice.

Essence of the invention

The invention has for its object to provide an improved protection system, by which on the one hand increases the safety and also the injuries, in particular by bruises, is eliminated by the moving sheet and the tool or the cheek of the movable tool part. On the other hand, wrong settings are to be eliminated by the operator.

The stated object is solved by the features of independent claim 1. Advantageous further developments of the solution according to the invention are specified in the dependent claims.

The development according to the invention thus went from the one discussed above DE 10 2004 020 024 A1 from, ie of a system for operating safety on a machine, with a first tool part, which is a working movement in the direction of a second tool part to a machining operation on a workpiece, and a control system. The protection system has a primary moving protective device for monitoring a first protection area between the tool parts. The primary moving protective device is designed as a light barrier or an image processing device and associated with the movable first tool part adjustable. The protection system is in communication with the control system of the machine.

The essence of the invention is seen in that the protection system is provided with a secondary protection device for monitoring and eliminating bruises between the workpiece moving during machining and the movable first tool part and / or its cheek in a second protection area connected to the Control system of the machine communicates.

In a preferred embodiment, the secondary protection device is designed as a unit forming a protective light grid in the predetermined second protection region on the movable first tool part and / or on its cheek.

The secondary protection device is preferably arranged on the cheek of the machine in height adjustable.

In a preferred embodiment, the secondary protection device for forming the protective light grid in the second protection region is provided with a plurality of light emitters and light receivers.

In addition, the protection system is connected to the safety control, which alone and / or in connection with the control system, preferably a CNC control, the machine before and / or during the machining of the workpiece is also suitable for a simulation of the machining process to determine whether this process can lead to a crushing in the second protected area, and to generate a warning in the case of a dangerous situation.

According to a further feature of the invention, the primary traveling protective device is provided with its own actuator, by which it can be automatically adjusted or adjusted to the prescribed height after each tool change. For this purpose, the actuator is connected to the control system, preferably with a CNC control of the machine and a measuring unit for determining respective position and the safety controller.

The actuator preferably has a transmission means, which advantageously has at least one, driven by a motor spindle, which is connected to a Konsolarm by or via thread. The bracket is preferably attached to the cheek of the movable first tool part.

The object is therefore achieved according to the invention by a new protection system, which on the one hand an improved, automatically height adjustable primary mitfahrende protection for the first protection area and on the other hand, an additional secondary protection device for monitoring and eliminating bruises between the moving during machining workpiece and the movable has first tool part and / or its cheek in a second protection area.

• – Bei der Anwendung der primären mitfahrenden Schutzvorrichtung werden zwei Achsen in der Steuerungseinheit definiert, die als Position die jeweilige Höhe des bewegbaren ersten Werkzeugteils ausgeben;
• – Diese Achsen sind praktisch so angeordnet, dass die mitfahrende primäre Schutzvorrichtung des Schutzsystems immer unter dem bewegbaren Werkzeugteils positioniert wird. Es ist kein Eingreifen des Bedieners mehr notwendig und damit werden individuelle Einstellungsfehler ausgeschlossen;
• – Mit der automatischen Verstellung der primären Schutzvorrichtung sind falsche manuelle Einstellungen unmöglich;
• – Um Quetschungen zwischen dem sich bei der Biegung bewegenden Blech und der Wange bzw. des Werkzeuges zu vermeiden, wird die spezielle sekundäre Schutzvorrichtung vorgeschlagen. Dabei kann eine Software z. B. der CNC-Steuerung die möglichen Quetschgefährdungen sogar im Voraus errechnen und nötigenfalls eine Warnung ausgeben. Dazu wird die sekundäre Schutzvorrichtung des Schutzsystems zu dem vorbestimmten Schutzbereich an der Wange bzw. am bewegbaren ersten Werkzeugteil vorgesehen;
• – Die Wange und/oder das bewegbare erste Werkzeugteil kann also mit der, auf die Maschinensteuerung einwirkenden sekundären Schutzvorrichtung ausgestattet sein, durch welche beim Eindringen eines Objektes (Blech oder Körperteil des Bedieners) der Hub der Gesenkbiegepresse sofort unterbrochen wird;
• – Die beiden Schutzvorrichtungen des vorgeschlagenen Schutzsystems sind vorzugsweise optisch bzw. opto-elektrisch;
• – Die sekundäre Schutzvorrichtung ist vorzugsweise an der Wange des bewegbaren ersten Werkzeugteils verstellbar aber fest angeordnet, oder wird an das bewegbare erste Werkzeugteil angepasst;
• – Die sekundäre Schutzvorrichtung ist vorzugsweise an der bewegbaren Wange montiert, wenn diese die Bewegung ausführt. Die sekundäre Schutzvorrichtung wird bei der Bewegung der entsprechenden Wange mitbewegt;

The present invention has substantially the following effects and advantages:

• In the application of the primary traveling protective device, two axes are defined in the control unit, which as position output the respective height of the movable first tool part;
• - These axes are practically arranged so that the moving primary protection device of the protection system is always positioned under the movable tool part. It is no longer necessary to intervene by the operator and thus excludes individual adjustment errors;
• - With the automatic adjustment of the primary protection device, incorrect manual settings are impossible;
• - To avoid bruising between the moving in the bending sheet and the cheek or the tool, the special secondary protection device is proposed. In this case, a software z. B. the CNC control the potential crushing even calculated in advance and if necessary issue a warning. For this purpose, the secondary protection device of the protection system is provided to the predetermined protection area on the cheek or on the movable first tool part;
• - The cheek and / or the movable first tool part can thus be equipped with the acting on the machine control secondary protection device through which the penetration of an object (sheet or body part of the operator) of the stroke of the press brake is interrupted immediately;
• The two protective devices of the proposed protection system are preferably optical or opto-electrical;
• The secondary protection device is preferably on the cheek of the movable first Tool part adjustable but fixed, or is adapted to the movable first tool part;
• - The secondary protection device is preferably mounted on the movable cheek when it performs the movement. The secondary protection device is moved with the movement of the corresponding cheek;

BRIEF DESCRIPTION OF THE DRAWING

The invention will be explained in more detail below with reference to the accompanying figures, which illustrate a preferred embodiment of the inventive solution. It shows:

1 a schematic front view of a Gesenkbiegepresse with the inventive protection system;

2 a simplified electrical circuit diagram of the protection system according to 1 ;

3 an embodiment of a primary traveling protective device of the inventive protection system according to 1 on a larger scale;

4 an embodiment of a secondary protection device of the inventive protection system according to 1 on a larger scale.

DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

1 illustrates a hydraulic press brake 1 that with an embodiment of the inventive protection system 2 is a violation of operators in the operation of the press brake 1 effectively prevent. The press brake 1 has a vertically movable upper cheek 3 at which a first tool part 4 is attached mitbewegbar. At a table 5 the press brake 1 is a lower cheek 6 attached, on which a lower tool as a second tool part 7 is arranged.

In this embodiment, the upper cheek 3 movable and the lower cheek 6 stationary manner. In an alternative embodiment, not shown here, the upper cheek may be stationary and the lower cheek may be movable. In a further alternative embodiment, both cheeks are movable relative to each other. In the following statements, it is assumed that a movable upper cheek and a fixed lower cheek. For the alternative embodiments, however, the following statements apply mutatis mutandis.

For controlled movement of the upper cheek 3 against the lower cheek 6 is the press brake 1 provided here with a hydraulic system, which is a pump and at least one working cylinder and to a first control, for. B. a CNC control 8th , comprising a computer with a memory unit which is a subunit of a control system 9 the press brake 1 forms ( 2 ).

The press brake 1 is also provided with a second control (not shown) of means for tapping the respective position of the upper cheek 3 and from the upper cheek 3 against, on the lower cheek 6 resting workpiece 10 ( 4 ) applied force. The pump of the hydraulic system is driven by an electric drive motor, preferably a three-phase motor. The working movement of the upper tool as a movable first tool part 4 is in 1 with an arrow 15 designated.

The control of a CNC press is done directly in the control system 9 integrated computer, which detects the actual state using position and state sensors and, after calculating the interpolation to the desired state from the CNC program, controls the control of the drive motor and of the other controlled machine elements accordingly. The CNC technology allows automated machining with several simultaneously controlled axes. (This is described in more detail in a co-pending patent application having the same filing date and the reference number BYW029PEP of the same Applicant).

For each machining operation, the previously machined workpiece must first be removed and the new workpiece to be machined inserted into the opening gap between the tool parts. This is usually done manually by an operator. In order to prevent injury during the closing of the opening gap, in particular the hands of the operator, by a dangerous movement of a part of the machine, a light barrier monitors a first protection area 11 typically located below the moving first tool part 4 extends. This predetermined first protection area 11 extends along a two-dimensional cross-section, so that a sensor can react quickly and reliably to dangerous interventions from different directions and trigger a stop of the dangerous movement.

The first tool part 4 has a leading edge 16 ( 4 ), due to the labor movement 15 defines a movement plane. Each intervention of an object in the plane of movement, such as an intervention with the hand of an operator, represents a dangerous situation, especially when the first tool part 4 already close to the second tool part 7 has approximated.

The inventive protection system 2 serves on the one hand to such interventions in the area of the edge 16 in the first protected area 11 to detect, depending on, ie in hazardous situations, the working movement of the press brake 1 to stop.

It is, however, to emphasize that the proposed protection system 2 not only can be used for operating fuse of press brakes, as in 1 you can see. The protection system 2 It can also be used with any other machine (eg cutting machines, stamping presses, etc.) in which two or more machine parts carry out a relative work movement.

The inventive protection system 2 has a primary protection device in the illustrated preferred embodiment 17 acting as a traveling protection device in the first protected area 11 is formed, and a secondary protection device 18 but active as a light curtain in a second protection area (discussed below).

The primary ride-on protection device 17 has a light transmitter 19 and a light receiver 20 , in the 1 right and left of the first tool part 4 at the press brake 1 are attached. They are both preferably with the first tool part 4 or with his cheek 3 so connected with the working movement of the first tool part 4 run along. The light transmitter 19 generates a light beam 21 , which is parallel to the leading edge 16 of the first tool part 4 runs and the light receiver 20 illuminated. So form the light transmitter 19 and the light receiver 20 a photocell, which is actually the first protected area 11 in front of and around the edge 16 of the first tool part 4 secures around.

If necessary, the traveling light transmitter 19 a plurality of mutually stationary light receivers 20 be assigned. Such an embodiment is conceivable in which the fixedly arranged light emitter 19 generates a light band or a plane of light that is parallel to the plane of motion, this light emitter 19 a moving light receiver 20 assigned.

The primary ride-on protection device 17 actually takes the required by the standard protection between the tool parts. It acts from top dead center of the movable first tool part 4 (please refer 1 ) to a point in the direction of the working movement (arrow 15 ) down, in which the press brake 1 has passed into a safe speed less than or equal to 10 mm / s. The primary ride-on protection device 17 here has a single photoelectric barrier ( 1 ). Optionally, the protection device 17 multiple photocells or, for example, a camera-based optical system.

In particular, in a camera-based optical system are in the controller, especially in a CNC control 8th , the machine or the press brake 1 comparing the captured image data of the traveling protection device with the positions of the protective device positioning axes and the programmed first tool part. This can be used to detect whether the correct first tool part (length and geometry) has been used.

If the test shows that the tool meets the expectations, the confirmation will be automatic. If any discrepancies are detected during the test, the operator is prompted to check the tool selection.

The same procedure can be started at the first stroke after a tool change. As a signal, for example, the signals of tool clamping are evaluated. In this case, the second tool part is captured by the moving protective device and transferred to the control, advantageously the CNC control. The image data is compared with the position of the upper cheek, the position of the traveling guard and the programmed second tool part. The height and the geometry of the second tool part can be checked. If the second part of the tool is not what is expected, the stroke is interrupted and the operator is prompted in a dialog to confirm or correct the tool.

For the purposes of the present invention, the traveling primary protection device 17 automatically set to the predetermined correct height. Preferably, the automatic adjustment is determined by a tool height advantageously stored in the CNC control of the machine. This is the moving primary protection device 17 with its own actuator 22 provided that a motor 23 with a spindle 24 includes. The primary protection device 17 is also with a measuring unit 25 ( 2 ) Mistake. This allows the relative position of the photocell of the primary protection device 17 to the first tool part 4 each in the knowledge of the currently installed tool (on a preferably predetermined and stored setpoint) automatically adjusted vertically, ie oriented, are. This usually happens during the setting phase of the press brake 1 ,

So if the first tool part 4 is changed, then adjusts the moving primary protection device 17 automatically the mutual position of the protection device accordingly.

The inventive protection system 2 also has a safety controller 26 (please refer 2 ) on. The actual control is done by two axes, which correspond to the pre-programmed workpieces 10 the height of the first tool part 4 as a position. These axles are arranged such that the accompanying protective device 17 always below the movable first tool part 4 in the first protected area 11 is positioned. No intervention on the part of the machine operator is necessary, so that individual errors are excluded.

The measuring unit 25 the moving primary protection device 17 reports the real position of the first part of the tool 4 to the safety controller 26 of the protection system 2 ,

The automatic adjustment movement of the moving primary protection device 17 So it is with the actuator 22 (or another mechanical system) through the spindle 24 and an internal thread 27 of an arm. In the illustrated embodiment, the one, in 1 left arranged spindle 24 the light transmitter 19 and the other, in 1 right arranged spindle 24 ' the light receiver 20 assigned. Every spindle 24 is at one end with one console arm each 31 through the internal thread 27 and rotatable therein, at its other end with the movable cheek 3 or the first tool part 4 firmly connected.

Preferably belongs to the protection system 2 also an evaluation unit (not shown), which may be separate from the light emitter 19 and the light receiver 20 arranged or at least partially in the light emitter 19 and / or in the light receiver 20 can be integrated. This evaluation unit has the task of the light emitter 19 to control if necessary and with the light receiver 20 Evaluate recorded images to, depending on the working movement of the first tool part 4 to stop. If necessary, the evaluation unit also makes it possible to measure the position and dimensions of individual workpiece or tool areas.

The traveling primary protection device 17 is to be adjusted so that its rays or the image due to the design always under the movable first tool part 4 are arranged. If the cheek 3 of the first tool part 4 moves, the moving protection device moves 17 regularly not self-employed. This is then firm with the cheek 3 connected and moves in the illustrated embodiment with this together.

Will be the first protected area 11 under the first tool part 4 is interrupted, the press brake 1 through the safety control 26 and a safety valve 28 stopped ( 2 ). In the 1 and 2 are a well-known control unit of the press brake with 29 and a foot pedal with 30 designated.

It is clear from the aforementioned disclosure that the moving primary protection device 17 when reaching the area of the workpiece 13 (of the sheet metal) is deactivated. All safety measures required in the standard end when the sheet is bent, which is technologically justified.

When using the automatically adjustable moving primary protection device 17 of the protection system according to the invention 2 Individual manual errors are excluded. This means that wrong settings are virtually impossible. This can significantly increase product quality.

As the cheek 3 and / or the first tool part 4 with the co-moving primary protection device acting on the machine control 17 is equipped, is the penetration of an object (sheet or body part of the operator), the stroke of the press brake 1 immediately interrupted.

The traveling primary protection device 17 is preferably optical and on the movable cheek 3 automatically adjustable, or is attached to the first tool part 4 customized.

In addition, a similar embodiment is possible, in which the automatically adjustable primary protection device 17 at the movement of the cheek 3 of the first tool part 4 and / or the cheek 6 of the second tool part 7 is moved.

Another aspect of the invention is seen in that in the proposed protection system 2 the previously mentioned secondary protection device 18 and thereby a protective light grid 32 is provided to bruises between bending sheet during movement and the cheek 3 or the first tool part 4 in a second protected area 33 the press brake 1 to avoid. In our experience, most bruising injuries are caused by the moving workpiece / sheet 13 and the movable first tool part 4 or his cheek 3 while working, being the primary protection device 17 is no longer active.

The details of the secondary protection device 18 of the protection system 2 are in the 1 and 4 to see. By the secondary protection device 18 becomes according to the invention, the protective light grid 32 possibly as a series of individual light beams, in the predetermined second protection area 33 on the cheek 3 or the first tool part 4 secured. This is the secondary protection device 18 in this case, each with a series of superimposed light emitters 34 and light receivers 35 Mistake. By such arrangement of the light grid 32 on the cheek 3 or on the first tool part 4 becomes the light grid 32 adjusted so that when bending the bending workpiece 10 (in the 4 the upper end of the sheet) in the light grid 32 penetrates.

During normal operation of the press brake 1 , ie in the bending of a sheet, or even in the preparation phase, in the context of the invention, in each case the possible crushing hazards between the moving sheet and the cheek 3 or the first tool part 4 during processing by the computer (using software) on each workpiece 10 calculated to avoid bruising between the plate and the cheek and / or tool. In a dangerous situation, warnings are generated and the press brake 1 is through the safety control 26 and the safety valve 28 (please refer 2 ) immediately turned off.

By the calculation of the control, which determines in the simulation in advance that it can come with this bending to a squeezing, so by the safety control 26 generates a warning that must be acknowledged by the operator.

Is it now an interruption of the light grid 32 during machining of the workpiece 10 becomes the press brake 1 stopped. Because the operator can get his hand out of the danger area or second protection area 33 to take. Another press of the operating device 29 or the foot pedal 30 then continues the previously interrupted bend.

In the event of a danger, a warning signal is emitted from the protection system 2 issued, which must be confirmed by the operator. It is in practice so that many workpieces of the cheek 3 of the first tool part 4 come very close or even invest in this. Without the aforementioned measure, ie without the secondary protection device 18 These parts would be difficult to produce.

It should be emphasized that the secondary protection device 18 of the protection system 2 and their light grid 32 is active during bending and is not misaligned. It is in the illustrated embodiment (see 4 ) on the cheek 3 of the first tool part 4 is fixed and adjusted at the beginning in the height (if necessary, manually, eg via screws and slots, or by an actuator), if the workpiece to be machined 10 is set up.

In 4 is a, supporting the workpiece from behind supporting bridge with 36 designated. In 2 is between the CNC control 8th and the actuator 22 an amplifier 37 inserted.

The secondary protection device 18 with her light grid 32 is of course not on the moving primary protection device 17 to 1 bound. This light grid 32 may possibly also be combined with other protection devices, such. B. one, in front of the bending line of the workpiece 10 arranged other light grid or photocell.

The invention is of course not limited to the described embodiment. Further embodiments and combinations are conceivable within the claimed scope of protection due to the above disclosure.

LIST OF REFERENCE NUMBERS

1

press brake

2

protection system

3

upper cheek

4

1. Tool part / upper tool

5

table

6

lower cheek

7

2. Tool part / lower tool

8th

CNC Control

9

control system

10

workpiece

11

First protection area

12

13

14

15

Arrow (work movement)

16

Edge of the upper tool

17

Primary moving protection device

18

Secondary protection device

19

light source

20

light receiver

21

beam of light

22

actuator

23

engine

24

spindle

25

measuring unit

26

safety control

27

inner thread

28

safety valve

29

control unit

30

foot pedal

31

Konsolarm

32

light Curtain

33

Second protection area

34

light source

35

light receiver

36

supporting bridge

37

amplifier

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102004020024 A1 [0003, 0012]
• US 6131429 A [0005]

Claims (8)

Protection system for operating safety on a machine, in particular a press brake ( 1 ), with a movable first tool part ( 4 ), which is a working movement ( 15 ) in the direction of a second, preferably stationary, tool part ( 7 ) to a machining operation on a workpiece ( 10 ) and a tax system ( 9 ), whereby the protection system ( 2 ) a primary traveling protection device ( 17 ) for monitoring a first protection area ( 11 ) between the tool parts ( 4 . 7 ), which the movable first tool part ( 4 ) and that the protection system ( 2 ) with the tax system ( 9 ) of the machine, characterized in that the protection system ( 2 ) with a secondary protection device ( 18 ) for monitoring and eliminating bruises between the workpiece moving during machining ( 10 ) and the movable first tool part ( 4 ) and / or its cheek ( 3 ) in a second protected area ( 33 ) associated with the control system ( 9 ) the machine ( 1 ) is in control connection. The protection system according to claim 1, characterized in that the secondary protection device ( 18 ) as one, in the predetermined second protection area ( 33 ) on the movable first tool part ( 4 ) and / or on the cheek ( 3 ) a protective light grid ( 32 ) forming unit is formed. The protection system according to claim 1 or 2, characterized in that the secondary protection device ( 18 ) on the cheek ( 3 ) the machine ( 1 ) is arranged adjustable in height. The protection system according to one of claims 1 to 3, characterized in that the secondary protection device ( 18 ) for the formation of the protective light grid ( 32 ) in the second protected area ( 33 ) with several light transmitters ( 34 ) and light receivers ( 35 ) is provided. The protection system according to one of claims 1 to 4, characterized in that the protection system ( 2 ) a safety controller ( 26 ) which alone and / or in connection with the tax system ( 9 ), preferably CNC control ( 8th ) the machine ( 1 ) before and / or during the machining of the workpiece ( 10 ) is suitable for a simulation of the machining process in order to determine whether it causes a crushing in the second protected area ( 33 ) and generates a warning in case of danger. The protection system according to one of claims 1 to 5, characterized in that the primary traveling protective device ( 17 ) with an actuator ( 22 ) is provided, by which it automatically adjusted after each tool change to the prescribed height, or is set, including the actuator ( 22 ) with the tax system ( 9 ), preferably with the CNC control ( 27 ), the machine ( 1 ) and a measuring unit ( 24 ) for determining the respective position and the safety control ( 26 ) connected is. The protection system according to claim 6, characterized in that the actuator ( 22 ) Comprises transmission means. The protection system according to claim 7, characterized in that the transmission means at least one, by a motor ( 23 ) driven spindle ( 24 ), which with a Konsolarm ( 31 ) is connected via thread, wherein the Konsolarm ( 31 ) preferably on the cheek ( 3 ) is attached.

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