Emergency stop switch and machine with emergency stop switch

Abstract

Including an emergency stop switch (1): - a switch mechanism (10) with a manually operated switch (11) and a first contact element (12) operatively connected to the switch (11), wherein the switch (11) is configured to bring the first contact element (12) into contact with a second contact element (14) when the switch (11) is actuated in order to trigger an emergency stop function, and - a cable pull mechanism (20) with a switching tongue (21) guided in a switching tongue guide (22), wherein the switching tongue (21) is configured to be connected to a first end of a cable (30), wherein a switching tongue spring (24) biases the switching tongue (21) in operation in a direction away from the cable (30), wherein the cable (30) is connected at its second end to a compensating spring (31) under pretension, wherein the first contact element (12) is operatively connected to the switching tongue (21) in such a way that when the pre-tensioned cable (30) is pulled, the switching tongue (21) is guided in the switching tongue guide (22) in the direction of the cable (30) and against a spring force of the switching tongue spring (24), thereby bringing the first contact element (12) into contact with the second contact element (14) in order to trigger the emergency stop function by means of the cable pull mechanism (20), and wherein the first contact element (12) and the switching tongue (21) are operatively connected to each other by means of an actuator (28), characterized in that the actuator (28) is designed as a drag roller.

Description

[0001] The invention relates to an emergency stop switch and a machine with such an emergency stop switch.

[0002] Emergency stop switches known from the prior art typically have a switching mechanism. This mechanism includes a switch connected to a first contact element. When actuated, the switch is designed to bring the first contact element into contact with a second contact element, thereby triggering an emergency stop function. This brings a machine equipped with the emergency stop switch to a standstill.

[0003] US 2010 / 0044204 A1 describes an emergency stop switch according to the preamble of claim 1.

[0004] The object of the invention is to provide a simple, compact and safe emergency stop switch.

[0005] This problem is solved by an emergency stop switch with the features of claim 1. Accordingly, an emergency stop switch is proposed comprising: a switch mechanism with a manually operated switch and a first contact element operatively connected to the switch, wherein the switch is configured to bring the first contact element into contact with a second contact element when the switch is actuated in order to trigger an emergency stop function, and a cable mechanism with a switching tongue guided in a switching tongue guide, wherein the switching tongue is configured to be connected to a first end of a cable, wherein a switching tongue spring biases the switching tongue in a direction away from the cable during operation, and wherein the cable is connected at its second end to a compensating spring under bias during operation, wherein the first contact element is operatively connected to the switching tongue in such a way as to:that when the pre-tensioned cable is pulled, the switching tongue is guided in the switching tongue guide towards the cable and against a spring force of the switching tongue spring, thereby bringing the first contact element into contact with the second contact element in order to trigger the emergency stop function by means of the cable pull mechanism, and wherein the first contact element and the switching tongue are operatively connected to each other by means of an actuator, wherein the actuator is designed as a drag roller.

[0006] With the emergency stop switch according to the invention, an emergency stop function can be triggered either by manually actuating the switch or by pulling the rope mechanism. Thus, the emergency stop switch according to the invention provides two mechanisms for triggering the emergency stop function. This enables a quick and therefore safe triggering of the emergency stop function by an operator, adapted to the respective situation. When coupled to a machine, the emergency stop switch can be manually triggered by the machine operator or another person using either the switch or the rope. This puts the machine from an operating mode into an emergency stop, thereby bringing the machine to a standstill in a hazardous situation.

[0007] Furthermore, the cable pull mechanism provides an additional means of triggering the emergency stop function if the operator is not near the switch but near the cable, which can be used, for example, to cordon off an area. This increases usability and ensures that the emergency stop switch will trigger the emergency stop correctly.

[0008] Furthermore, since the switch mechanism and the cable pull mechanism are coupled to each other via the first contact element, the design of the emergency stop switch according to the invention is compact and simple.

[0009] The operation refers to an operation of the emergency stop switch in which the switching tongue is connected to the first end of the cable, is pre-tensioned to the compensating spring, and the cable is pre-tensioned to the compensating spring at its second end. The cable and / or the compensating spring may be designed to be interchangeable.

[0010] In particular, the switching tongue can be connected to the first end of the cable. Furthermore, in particular, the switching tongue can be pre-tensioned in the direction away from the cable by means of the switching tongue spring. Also in particular, the cable can be pre-tensioned at its second end by means of a compensating spring during operation.

[0011] To pre-tension the switching tongue using the switching tongue spring, the switching tongue can be pressed against the switching tongue spring.

[0012] The second contact element can be part of a switching unit. The switching unit can trigger the emergency stop function when the second contact element is actuated. For this purpose, the second contact element can be configured to switch an electrical contact of the switching unit, thereby triggering the emergency stop function.

[0013] The rope can be made of wire. This makes the rope robust and resistant to mechanical damage, thus reducing the risk of breakage. Furthermore, the switching tongue can be connected to a rope eye. The rope can be attached to the rope eye, which is particularly simple and secure.

[0014] A sliding bearing can be arranged on the switch blade guide. This enables defined and lubricated sliding of the switch blade within the switch blade guide.

[0015] It is provided that the first contact element and the switching tongue are operatively connected to each other by means of an actuator. The actuator can, in particular, be designed to be movable along the switching tongue. The actuator is designed to roll along the switching tongue. The actuator can be arranged such that, in operating mode, it is in permanent contact with the first contact element and the switching tongue. Furthermore, the actuator can be slidably mounted in the direction from the switching tongue to the second contact element, or in other words, along a first axis along which the switching mechanism acts. By pulling the cable, the switching tongue is guided in its guide, and the actuator moves along the switching tongue and the first contact element, thereby moving the first contact element towards the second contact element.

[0016] It is also provided that the actuator is designed as a pulley. The pulley can be formed by a cylindrical body rotatably mounted on a longitudinal central axis of the cylindrical body. The pulley can be arranged such that, in operating mode, it is in permanent contact with the first contact element and the switching tongue. Furthermore, the pulley can be slidably mounted in the direction from the switching tongue to the second contact element, or in other words, along a first axis along which the switching mechanism acts. By pulling the cable, the switching tongue is guided in its guide, and the pulley rolls along the switching tongue and the first contact element, thereby moving the first contact element toward the second contact element.

[0017] The actuator can be arranged in a recess of the switching tongue. The recess is designed such that when the actuator is in the recess, there is a gap between the first contact element, against which the actuator rests, and the second contact element. Pulling the cable guides the switching tongue in its guide, and the actuator moves along the switching tongue and out of the recess. The gap between the first and second contact elements decreases until the first contact element finally makes contact with the second, triggering the emergency stop function.

[0018] Because the first contact element and the switching tongue are operatively connected to each other via the actuator, in particular the pulley, and in particular can only be operatively connected to each other via the actuator, the contact between the first and second contact elements established by pulling the rope is not interrupted when the rope is released. Although the switching tongue spring, compressed by pulling the rope, forces the switching tongue back to its initial position before the rope was pulled, i.e., away from the rope, only the actuator moves back into the recess, while the first contact element continues to make contact with the second contact element. This ensures that the machine remains in emergency stop mode once the emergency stop function has been triggered by pulling the rope. Unintentional start-up of the machine by releasing the rope is thus prevented.The rope does not need to be held to ensure the machine stops. To return the machine to operating mode or to deactivate the emergency stop, the switch of the switching mechanism simply needs to be pulled back or disengaged. This is because the first contact element is also connected to the switch, so that when the emergency stop function is triggered by pulling the rope, the switch is also activated or locked in place. This ensures that operating mode is only resumed when safe operation is possible.

[0019] The recess may be designed to have two flanks running obliquely to a longitudinal axis of the switching tongue. The actuator may be configured to move upwards along a first flank of the two flanks when the rope is pulled and / or along a second flank of the two flanks when the rope is broken, in order to move the first contact element to the second contact element. The two flanks may be formed, in particular, on a common side of the switching tongue. The two flanks may be arranged opposite each other. The two flanks may run or rise in opposite directions. A gap may exist between the two flanks. This gap may be formed by a straight section on the switching tongue. The flanks may run obliquely to the longitudinal axis, in particular at an angle in the range of 15° to 75°, and especially in the range of 30° to 60°.This provides sufficient resistance to the actuator's movement.

[0020] It is also possible for the recess to be trapezoidal. The trapezoidal shape can have the flanks described above. In this sense, the recess represents a trapezoidal shape. While it is advantageous, it is not necessary for the recess to correspond exactly to a trapezoidal shape mathematically. The trapezoidal recess in this sense need not consist solely of straight lines, but can also have rounded lines and rounded corners, as long as it represents a trapezoidal shape in the broadest sense. The trapezoidal shape allows for a simple movement of the actuator along one (straight or rounded) flank of the trapezoidal recess of the switching tongue. By using sloping flanks of the trapezoidal shape, the distance between the first contact element and the second contact element can be adjusted as a linear function depending on the guide path of the switching tongue, which enables a particularly simple design.A symmetry line of the trapezoidal recess can coincide with a first axis along which the switch mechanism operates. This ensures that the actuator is optimally positioned within the recess.

[0021] It is also possible for the switching tongue spring to be pre-tensioned. In particular, the switching tongue spring can be pre-tensioned with such a spring force that, when the cable breaks, the switching tongue spring moves the switching tongue in the switching tongue guide away from the cable so far that the actuator moves out of the recess. This is particularly advantageous if the recess is trapezoidal and / or has two flanks running obliquely to the longitudinal axis. This is because, on a first flank of the trapezoidal shape, the functionality for the emergency stop function is provided by pulling the cable, as the first actuator moves upwards along the first flank and moves the first contact element to the second contact element.And on a second flank of the recess, the functionality for the emergency stop function is provided by means of cable breaking, as the actuator moves up the second slope and moves the first contact element to the second contact element. Accordingly, it can be provided that the switching tongue spring is pre-tensioned with such a spring force that, when the cable breaks, the switching tongue spring moves the switching tongue in the switching tongue guide away from the cable far enough that the actuator moves out of the recess along the second flank.

[0022] A special feature is that if the pre-tensioned switch tongue spring is released due to the cable breaking, the switch can no longer be reset or disengaged. This is because the switch tongue is then guided back in the opposite direction by the cable, so that, due to the lack of pre-tension in the cable and switch tongue spring, the actuator can no longer enter the recess and blocks the switch's retraction by being positioned between the first contact element and the switch tongue. This prevents the machine from being unintentionally operated in working mode by resetting the switch if the cable breaks. Consequently, the broken cable must first be replaced before operation can be resumed.

[0023] Furthermore, the switch may be designed as a mushroom-head switch. The mushroom-head switch can be easily activated by pressing it to trigger the emergency stop function, locking into place in the pressed position. The mushroom-head switch can also be easily released by pulling it back to end the emergency stop or to set the operating mode, at which point it disengages.

[0024] It is also possible for the first contact element to be designed as a contact plate. This provides a large contact area for contacting the second contact element. Furthermore, the actuator can move particularly smoothly along the contact plate. The contact plate can, for example, be circular.

[0025] It is also possible for the shift tongue spring to be designed as a coil spring arranged concentrically around the shift tongue. This allows for a particularly compact design of the cable-operated mechanism.

[0026] It is also possible for the switching tongue guide to be formed within a switching tongue housing, wherein the switching tongue housing has a contact section against which the switching tongue spring rests. When the cable is pulled, the switching tongue spring can be easily compressed and tensioned against this contact section, subsequently causing the switching tongue to return to its original position. Furthermore, integrating the contact section into the switching tongue housing also allows for a compact design of the cable-operated mechanism.

[0027] The switching tongue housing can consist of a first switching tongue housing part and a second switching tongue housing part. The switching tongue can be fixed in the second switching tongue housing part by means of a fixing device, such as a spring pin. The fixing of the switching tongue by the spring pin causes the second switching tongue housing part to move away from the first switching tongue housing part when the cable is pulled. This allows the switching tongue to be moved easily along the second axis. A bellows can be arranged between the switching tongue housing parts, which can expand and contract to follow the movement of the switching tongue and provide a dust seal.

[0028] It is also possible for the shift tongue to have a support section against which the shift tongue spring is supported. This support section can be designed as a circumferential thickening of the shift tongue. In particular, the shift tongue spring can be supported against the support section by means of a disc spring. The shift tongue spring can thus be easily supported against the support section to allow for compression. This also enables a compact design of the cable-operated mechanism.

[0029] Furthermore, the switching tongue can have a guide pin guided in a longitudinal guide of the cable mechanism. The guide pin can, in particular, be guided in a longitudinal guide of the switching tongue housing. The longitudinal guide can be designed as an elongated recess in the switching tongue housing. The guide pin can, in particular, be arranged on the support section. This prevents the switching tongue and the cable from twisting.

[0030] Furthermore, it may be provided that the compensating spring is fixed in a clamping device during operation, or is designed to be fixed in a clamping device. This allows the pretensioning of the cable to be easily achieved.

[0031] Furthermore, it can be provided that a first axis, along which the switch mechanism acts, and a second axis, along which the cable mechanism acts, are positioned perpendicular to each other, in particular orthogonally. This achieves a compact design in which both mechanisms interact with each other in a simple manner.

[0032] Finally, it is also possible for the switch mechanism and the cable pull mechanism to be arranged in a common housing of the emergency stop switch. The housing may further have at least one opening. One opening may be for the switch, which can be mounted on the housing. In this case, the switch can be easily actuated from outside the housing. Another opening may be for the switch blade guide, a switch blade housing, and / or the cable. The switch blade housing can also be mounted on the housing. This allows the cable to be easily pulled from outside the housing. The switch mechanism can be attached to the housing, for example, by means of a flange plate, in particular by screwing it on. The cable pull mechanism can be attached to the housing, for example, in such a way that the switch blade housing is positively inserted into the opening of the housing.This also enables a compact, safe and simple design of the emergency stop switch.

[0033] Furthermore, the switching tongue may be provided with a mark for setting a predetermined cable tension, with the emergency stop switch having a viewing window for reading the mark. In other words, a predetermined displacement of the switching tongue can be set. This allows the cable tension to be manually set to a predetermined, or in other words, correct value. For example, the mark could be a circumferential groove or a colored marking on the switching tongue. The predetermined mark can be set when the mark is in a predetermined position visible through the viewing window. This position could be, for example, when the mark is located in the center of the viewing window. The point of correct tension can then be easily identified or read from the mark when it is centered in the viewing window.The viewing opening can, for example, be designed as a circular recess, particularly with a sight glass. The viewing opening can be located, in particular, in the switching tongue housing.

[0034] The aforementioned task is also solved by a machine with an emergency stop switch, wherein the second contact element is connected to the machine in such a way that triggering the emergency stop function by means of the emergency stop switch causes the machine to stop.

[0035] The second contact element can be connected to a switching unit of the machine, as mentioned at the beginning, or the switching unit can be part of the emergency stop switch and be connected to a power supply unit or another supply unit of the machine to trigger an emergency stop function.

[0036] Further details and advantageous embodiments of the invention can be found in the following description, which provides a more detailed description and explanation of an exemplary embodiment of the invention.

[0037] They show: Fig. 1 An embodiment of an emergency stop switch in a partially cut-out, perspective side view; and Fig. 2 a sectional view of part of the emergency stop switch Fig. 1.

[0038] Emergency stop switch 1 is located in the Fig. 1 in an operating mode. The operating mode is a mode in which the emergency stop function is not triggered and a machine equipped with the emergency stop switch 1 is being operated properly, in particular supplied with power.

[0039] The emergency stop switch 1 has a housing 2. A switch mechanism 10 and a cable pull mechanism 20 are housed in the housing 2 of the emergency stop switch 1.

[0040] The switch mechanism 10 includes a switch 11, which in the present embodiment is designed as a mushroom-head switch. The switch 11 is rigidly connected to a first contact element 12 by means of a connecting part 13. The first contact element 12 is designed as a round contact plate 12. The switch 11 can be actuated in the direction X.1 along the first axis X.

[0041] When switch 11 is activated due to an emergency, the connecting part 13 and the first contact element 12 are moved in the direction X.1 along the first axis X. As the contact plate 12 moves, it contacts a second contact element 14 of a switching unit 15, which is located on a side wall of the housing 2. This triggers an emergency stop function. For example, in the case of a powered machine, the power supply can be interrupted by activating the emergency stop function. This brings the machine to a standstill.

[0042] To deactivate the emergency stop function or to return to operating mode, switch 11 can be reset in the direction X.2 along the first axis X. This action breaks the contact between contact plate 12 and the second contact element 14, thereby returning the switching unit 15 to operating mode.

[0043] The cable-operated mechanism 20 comprises a switching tongue 21 and a cable 30. The switching tongue 21 is connected to the first end of the cable 30 by means of a cable eye 29. Furthermore, the switching tongue 21 is guided in a switching tongue guide 22. The switching tongue guide 22 is formed in a switching tongue housing 23. The switching tongue housing 23 encloses the switching tongue 21 in a section close to the cable 30 and leaves the switching tongue 21 free in a section farther from the cable 30.

[0044] A switching tongue spring 24 of the cable-operated mechanism 20 is arranged concentrically around the switching tongue 21. The switching tongue spring 24 is supported against a support section 25 of the switching tongue 21. The switching tongue spring 24 is designed as a compression spring. The support section 25 is designed as a circumferential thickening of the switching tongue 21. Furthermore, the switching tongue spring 24 bears against a contact section 26. The contact section 26 is formed within a switching tongue housing 23.

[0045] The cable 30 is further connected at its second end to a compensating spring 31. The compensating spring 31 is clamped in a fixed fixture 32. The compensating spring 31 pre-tensions the cable 30. When the cable 30 is pre-tensioned, the switching tongue spring 24 is compressed and thus pre-tensioned between the support section 25 and the contact section 26.

[0046] The switching tongue 21 also has a trapezoidal recess 27 with two flanks F.1, F.2 (see Fig. 2). The cable-operated mechanism 20 has an actuator 28 arranged in the trapezoidal recess 27 in operating mode. The actuator 28 is slidably mounted along the second axis Y. In this case, the actuator 28 is designed as a pulley 28. The pulley 28 is mounted on the connecting part 13 of the switch mechanism 10. A longitudinal center axis of the pulley 28, designed as a pivot axis, coincides with the first axis X of the switch mechanism 10.

[0047] If the cable 30 is now pulled in any direction along the first axis X, the second axis Y, or the third axis Z, each of which is orthogonal to the others, while the emergency stop switch 1 is in operating mode, the switching tongue 21 is pulled along its switching tongue guide 22 in the direction Y.2 along the second axis Y and against the spring resistance of the pre-tensioned switching tongue spring 24. This displaces the switching tongue 21 in the direction Y.2 relative to the pulley 28 and the contact plate 12. Simultaneously, the trapezoidal recess 27 moves with the switching tongue 21 relative to the pulley 28 in the direction Y.2 along the second axis Y. Accordingly, the pulley 28 rolls onto the first flank F.1 of the trapezoidal recess 27, which is closest to the free end of the switching tongue 21, and thus moves in the direction X.1 along the first axis X.The drag roller 28 also rolls on the contact plate 12 and pushes it towards the second contact element 14 until the contact plate 12 and the second contact element 14 make contact. This triggers the emergency stop function by means of the cable pull mechanism 20.

[0048] When the operator who pulled the cable 30 releases it, the switching tongue spring 24, which is further pre-tensioned against the spring resistance, pushes the switching tongue 21 back towards Y.1 along the second axis Y until the pulley 28 moves along the first flank F.1 and towards X.2 along the first axis X to return to the center of the recess 27. The cable 30, tensioned again by the compensating spring 31, prevents the pulley 28 from moving further towards Y.2 along the second axis Y over the second ramp. The contact plate 12 remains in contact with the second contact element 14, so that despite the release of the cable, the operating mode is not activated because the pulley 28 is not rigidly connected to the contact plate 12, but merely makes contact with it when the emergency stop function is triggered.

[0049] To deactivate the emergency stop function or to return to operating mode, switch 11 must also be reset in the direction X.2 along the first axis X. This process breaks the contact between contact plate 12 and the second contact element 14, thereby returning the switching unit 15 to operating mode.

[0050] In addition to triggering the emergency stop function by pressing switch 11 and pulling rope 30, the emergency stop switch 1 has a third way to trigger the emergency stop function. This third way is by breaking rope 30. For safety reasons, the emergency stop function is activated in this case.

[0051] If the cable 30 breaks, the pretension of the cable 30, via the compensating spring 31, no longer acts on the shift tongue 21. This completely releases the pretensioned shift tongue spring 24, so that this pretension also dissipates and the shift tongue spring 24 returns the shift tongue 21 maximally in the direction Y.1 along the second axis Y. During this process, the drag roller 28 rolls along the second flank F.2 (see Fig. 2) the trapezoidal recess 27 rises and presses the contact plate 12 against the second contact element 14, thereby triggering the emergency stop function.

[0052] The pulley 28 is then located in the direction Y.2 along the second axis Y behind the trapezoidal recess 27 and between the switching tongue 21 and the contact plate 12. Unlike when the cable 30 is pulled, the pulley 28 does not return to the recess 27 after the cable 30 is released, as there is no preload from the cable 30 to guide the switching tongue 21 in the direction Y.2 along the second axis Y. Furthermore, the switching tongue spring 24 would also have to be overcome to move the recess 27 in front of the pulley 28. Thus, the pulley 28 blocks the mushroom-head switch 11 from being pulled back. This prevents the emergency stop switch 1 from being unlocked in the event of a broken cable 30, for safety reasons. The broken cable 30 must be replaced in order to make the emergency stop switch 1 operational again so that it can be put into operating mode.

[0053] How Fig. 2 in the view of a longitudinal section through the switching tongue 21 together with switching tongue housing 23 of the emergency stop switch 1 from Fig. As shown in Figure 1, the switching tongue 21 is designed as an actuating bolt, which is guided in the switching tongue guide 22 in the switching tongue housing 23. At its end opposite the trapezoidal recess 27, the switching tongue 21 is connected to the rope eye 29 for connection with the rope 30 (see Figure 1). Fig. 1) connected.

[0054] The trapezoidal recess 27 has a first flank F.1 and a second flank F.2, which are formed on a common side of the switching tongue 21. The flanks F.1 and F.2 are formed obliquely in opposite directions relative to a longitudinal axis L of the switching tongue 21. Between the flanks F.1 and F.2 is a central section of the recess 27, which in this case is straight and in which the drag roller 28 is located when the cable 30 is not pulled and has not broken.

[0055] Furthermore, the switching tongue housing 23 is formed from a first switching tongue housing part 23.1 and a second switching tongue housing part 23.2. The switching tongue 21 is fixed in the second switching tongue housing part 23.2, which is located near the cable eye 29, by means of a tension pin 33. The first switching tongue housing part 23.1 is located near the trapezoidal recess 27 and includes the switching tongue spring 24. The fixing of the switching tongue 21 by means of the tension pin 33 causes the second switching tongue housing part 23.2 to move away from the first switching tongue housing part 23.1 when the cable 30 is pulled. This allows the switching tongue 21 to be moved along the second axis Y.

[0056] A bellows 35 is arranged between the switching tongue housing parts 23.1 and 23.2. This bellows can expand and contract to follow the movement of the switching tongue 21 and to provide a seal against oil escaping from a sliding bearing 34 and the switching tongue guide 22. The sliding bearing 34 is formed in the first switching tongue housing part 23.1 and allows the switching tongue 21 to slide in the switching tongue guide 22.

[0057] Furthermore, the switching tongue 21, which is coaxially surrounded by the switching tongue spring 24 designed as a compression spring, is provided with a sleeve 36 and supported against the support section 25 by means of a spring plate 37. The support section 25 has a guide pin 38. The guide pin 38 extends in a direction Z.2 along the third axis Z. The guide pin 38 is guided in a longitudinal guide of the switching tongue housing 23, as shown in Fig.1 is partially visible. The longitudinal guide is designed as an elongated recess in the switching tongue housing 23, in particular in the first switching tongue housing part 23.1. This prevents the switching tongue 21 and the cable 30 from twisting.

[0058] Furthermore, the switching tongue housing 23 has a viewing opening 40 for reading a marking 21 arranged on the switching tongue 21. The marking 21 is arranged at a position along the switching tongue 21 such that when the marking 21 is located in the center of the viewing opening 40, a predetermined pretension of the cable 30 is set.

Claims

[1] Including an emergency stop switch (1): - a switch mechanism (10) with a manually operated switch (11) and a first contact element (12) operatively connected to the switch (11), wherein the switch (11) is configured to bring the first contact element (12) into contact with a second contact element (14) when the switch (11) is actuated in order to trigger an emergency stop function, and - a cable pull mechanism (20) with a switching tongue (21) guided in a switching tongue guide (22), wherein the switching tongue (21) is configured to be connected to a first end of a cable (30), wherein a switching tongue spring (24) biases the switching tongue (21) in operation in a direction away from the cable (30), wherein the cable (30) is connected at its second end to a compensating spring (31) under pretension, wherein the first contact element (12) is operatively connected to the switching tongue (21) in such a way that when the pre-tensioned cable (30) is pulled, the switching tongue (21) is guided in the switching tongue guide (22) in the direction of the cable (30) and against a spring force of the switching tongue spring (24), thereby bringing the first contact element (12) into contact with the second contact element (14) in order to trigger the emergency stop function by means of the cable pull mechanism (20), and wherein the first contact element (12) and the switching tongue (21) are operatively connected to each other by means of an actuator (28), characterized by , that the actuator (28) is designed as a drag roller. [2] Emergency stop switch (1) according to claim 1, characterized by , that the actuator (28) is arranged in a recess (27) of the switching tongue (21). [3] Emergency stop switch (1) according to claim 2, characterized by, that the recess (27) has two flanks (F.1, F.2) running obliquely to a longitudinal axis (L) of the switching tongue (21). [4] Emergency stop switch (1) according to claim 2 or 3, characterized by , that the recess (27) is trapezoidal in shape. [5] Emergency stop switch (1) according to any one of the preceding claims, characterized by , that the shift tongue spring (24) is pre-tensioned. [6] Emergency stop switch (1) according to any of the preceding claims, characterized by , that the switching tongue spring (24) is designed as a spiral spring which is arranged concentrically around the switching tongue (21). [7] Emergency stop switch (1) according to any one of the preceding claims, characterized by , that the switching tongue guide (22) is formed in a switching tongue housing (23), wherein the switching tongue housing (23) has a contact section (26) against which the switching tongue spring (24) is applied. [8] Emergency stop switch (1) according to any of the preceding claims, characterized by , that the shift tongue (21) has a support section (25) on which the shift tongue spring (24) is supported. [9] Emergency stop switch (1) according to any of the preceding claims, characterized by , that the switching tongue (21) has a guide pin (38) guided in a longitudinal guide of the cable pull mechanism (20). [10] Emergency stop switch (1) according to any one of the preceding claims, characterized by that the compensating spring (31) is clamped in a clamping device (32) during operation or is designed to be clamped in a clamping device (32). [11] Emergency stop switch (1) according to any of the preceding claims, characterized by , that a first axis (X), along which the switch mechanism (10) acts, and a second axis (Y), along which the cable mechanism (20) acts, are perpendicular, in particular orthogonal, to each other. [12] Emergency stop switch (1) according to any one of the preceding claims, characterized by , that the switch mechanism (10) and the cable pull mechanism (20) are arranged in a common housing (2) of the emergency stop switch (1). [13] Emergency stop switch (1) according to any of the preceding claims, characterized by , that the switching tongue (21) has a marking (41) for setting a predetermined pretension of the rope (30), wherein the emergency stop switch (1) has a viewing opening (40) for reading the marking (41). [14] Machine with an emergency stop switch (1) according to one of the preceding claims, wherein the second contact element (14) is connected to the machine in such a way that triggering the emergency stop function by means of the emergency stop switch (1) causes the machine to stop.

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