EP3091163B1 - Sliding door, in particular elevator sliding door - Google Patents

Description

The invention relates to a sliding door, in particular an elevator sliding door.

Sliding doors of the types mentioned above are usually provided and operated as automatically opening and closing doors. They are often used as elevator doors, be it elevator car doors or elevator shaft doors. Such sliding doors are often found in the entrance area of office buildings, department stores and other public buildings.

Since the movable door elements are moved relative to one another by a motor during automatic sliding door operation, special precautionary measures are required in order to avoid accidents and damage to persons and objects in the area of movement of these door elements.

Door leaves in particular come into question as movable door elements, so that the following considerations relate predominantly to door leaves when movable door elements are mentioned. The emergency stop process when objects intrude into the security area is particularly relevant for the door opening process.

In particular, door leaves, which are formed from glass panes or have glass pane fillings, appear to be popular objects of contact with hands. Children in particular seem to have a tendency to feel the glass panes of such door leaves with their fingers. When a finger touches a door leaf moving in the door opening direction it can happen that the fingers in question are carried along by the door leaf in the door opening direction until they form on or in the gap between the moving door leaf and, for example, a door frame post or - in the case of a telescopic door - for example in the gap between the two in the opening direction of an overlap moving telescopic door leaves and get squeezed in the process. Such a gap runs along a respective vertical edge of the common overlap between door leaf and frame or between two door leaves. The problem of pulling fingers or objects in general into the gap between the door leaf and frame or between two door leaves of a sliding door has already been taken up by various door manufacturers, and various solutions have been proposed as to how to prevent fingers or in general Objects come into contact with or in such a gap.

For example, from the DE 199 37 561 A1 a generic telescopic sliding door with at least one pair of door elements that can be moved relative to one another, namely a door frame and one or more door leaves, is known, the door elements being moved relative to one another to open the door and between them a free-running gap, i.e. a gap of the type explained above, in the limit the common overlap area. The known telescopic sliding door has a safety device with a monitoring device which monitors the presence and / or penetration of an object in a safety zone which extends along this edge on the vertical edge of the common overlap running transversely to the direction of movement of the door elements. Under the control of a control device, the safety device ends the opening movement of the telescopic sliding door by stopping the electric door drive when the monitoring device signals an intrusion or the presence of an object in the safety zone by means of a corresponding fault signal. In particular in the case of door leaves with a relatively large mass, it can occur in such known telescopic sliding doors Due to their inertia, moving door leaves do not stop immediately when an object enters the security zone, but continue to run slightly after the respective door drive has received the emergency stop instruction and has been switched off. This means that there is a residual risk that an object will nevertheless get into the free-wheeling gap, although the safety device has reacted immediately to the relevant fault signal from the monitoring device.

The protection scheme of the DE 199 37 561 A1 known telescopic sliding door comprises, as a monitoring device, a substantially mechanically actuated strike strip, which comprises a movable or deformable strip arranged on the door element, or a predominantly electronic or opto-electronically operating sensor strip, which has at least one one-way and / or two-way light barrier. The monitoring device is objectively arranged on or in the free-running gap at the edge of the overlap area between the door elements moved relative to one another, i.e. in the example on and along an edge of the end face of a door element in the monitoring zone, and preferably on the door element that no or covered a smaller displacement distance. Basically, use is made of the principle that if the blow bar is deformed or displaced by an object on it, a fault signal is triggered. Such a deformation or displacement of the blow bar is in some embodiments DE 199 37 561 A1 detected optoelectronically by means of light barriers, which are aligned in the direction of movement of the door elements and respond when the transmitter light beam (s) do not reach the receiver (s) of the light barriers in question in a predetermined manner, for example if the mechanically operated blow bar is deformed or displaced by someone in the security zone takes place engaging in the freewheeling gap object. Such a safety device is not only relatively complex and difficult to install, but also comparatively sluggish in response behavior, so that for this reason there is a risk that an object can penetrate the free-running gap before the security system can stop the door movement.

Further door systems with safety devices to prevent objects from entering the free-running gap in the overlap area between two door elements moved relative to one another to form the overlap area, namely between a moving door leaf and another door element, be it a door leaf or door frame section, are, for example, from the EP 2 074 270 B1 and from the DE 10 2004 053 820 B4 known. These other known door systems also have switching strips or mechanically operated switching arrangements as monitoring devices, which respond to their displacement or deformation by objects that have penetrated the free-wheeling gap in order to trigger a fault signal so that the safety device is then under the control of an associated control device the door drive stops. For these known door systems, too, the safety devices are designed to be relatively complex and show a comparatively sluggish response behavior. From the EP 1 243 544 A2 and the WO 01/96226 A1 further examples of sliding doors are known. Also refer to the documents EP 2 332 876 A1 and DE 102 60 109 A1 pointed out.

The object of the present invention is to overcome such disadvantages of known automatic sliding doors and to show possibilities of detecting the presence and / or penetration of an object on or into the gap in the overlap area of two moving relative to each other to form the overlap area and transverse to the direction of movement one behind the other and with a small distance from one another positioned door elements in automatic sliding doors to the effect that the safety devices show a quick response behavior, function reliably and, in particular, simply and safely install are. The monitoring devices of the security devices should preferably also have a compact design and not be susceptible to damage.

For this purpose, a sliding door according to claim 1 is proposed.

Such reflex radiation scanners are also available in a very compact design inexpensively as reflex light scanners at the specialist market. They are easy and space-saving to assemble and their function is reliable. With reflex radiation sensors, radiation is reflected back from the object to be detected. Radiation transmitters and receivers are often housed parallel to one another in a common housing. Reflex radiation scanners are also available as so-called reflex radiation scanners with background suppression. These work particularly reliably when it comes to recognizing dark objects against a light background. Reflex radiation sensors, which are suitable for determining distances, are sometimes also referred to as reflection distance sensors or optical distance sensors. There are two basic functional principles according to which reflex radiation sensors work.

A first functional principle is the triangulation principle, according to which the button can switch or output a fault signal if radiation emitted by the radiation transmitter is reflected back at certain angles and accordingly hits certain areas of the radiation receiver of the reflex radiation sensor.

The second functional principle is the transit time detection principle, according to which the button can switch or output a fault signal if radiation pulses emitted by the radiation transmitter are reflected back to the radiation receiver of the reflex radiation sensor within a certain time window Radiation pulses are recorded by measurement.

For the purposes of the present invention, all of the aforementioned reflex radiation sensors are suitable. However, reflex light scanners are preferred, in particular infrared light radiation scanners. Light-emitting diodes and preferably IR laser diodes are particularly suitable as light sources of such reflex light sensors. Combined light sources, which can emit visible light and infrared light along the same optical path, are also possible, with the visible light facilitating the adjustment of the sensor system or the monitoring device due to the visible light spot and the infrared light serving as the actual measuring light of the reflex light scanner. Photodiodes, phototransistors, or possibly photoresistors, for example, can be used as light sensors for detecting the reflected light. In contrast to conventional reflex light barriers, which have a light transmitter and light receiver on one side of the monitoring section and a light reflector on the opposite side of the monitoring section and which respond to an interruption of the light beam on its way from the light transmitter to the light reflector and from the light reflector to the light receiver, the Reflex light scanners used according to the invention focus on light that is reflected back from the object to be detected in the monitoring area itself. Photoelectric barriers, be it through-beam photoelectric barriers or reflex photoelectric barriers, are less suitable for the invention, as they mean greater installation effort and their reliable and reproducible function depends on whether the light receiver or light reflector on its light entry window is clean or dirty . The pollution problem with light barriers is relevant for the considerations made here, since according to the concept of the invention the security zone to be monitored normally runs vertically from the upper end to the lower end of the door in question and a light barrier element (transmitter, reflector or receiver) would have to be provided in the door threshold . However, this is more susceptible to pollution Place as it can easily be entered with shoes on by people walking through the door. This problem is overcome with reflex radiation sensors according to the invention, since according to the invention the upper end of the door is selected as the installation location. Then there is no need to install components of the system on the floor or in the door sill.

Within the scope of the invention, systems could also be used as reflex radiation sensors which function with sound radiation, in particular ultrasound radiation, and accordingly react to sound reflected back from the object to be detected in the monitoring area. Apart from the special type of radiation, such sound reflex switches can function in the same way as reflex light switches.

The invention can be used in telescopic sliding doors and non-telescopic sliding doors. In the case of telescopic sliding doors, the door opening process results in a joint lateral movement of at least two door leaves in a common door opening direction, the door leaves being positioned parallel to one another and arranged one behind the other transversely to the door opening movement direction. One of the door leaves moves faster than the other door leaf, so that when the door is opened there is an increasingly larger area of overlap between the two door leaves. In this overlap area, the two door leaves delimit a gap between them, which is sometimes also referred to as a free-swing gap. In a similar way, a gap is also formed where a respective door leaf overlaps with a door frame section or door post lying one behind the other during the door opening movement. The latter situation is usually given both with telescopic sliding doors and with non-telescopic sliding doors. As already mentioned, the risk is to be countered that when a person touches a moving door leaf, the door leaf is carried along to the relevant gap and at the gap or in the gap be squeezed. Quite generally, the risk is to be countered that small objects unintentionally get into the gap and damage to the objects and / or the sliding door occurs as a result.

For this purpose, according to the present invention, a security zone is monitored which extends along this edge at an edge of the overlap area running transversely to the direction of movement of the moving door leaf. In the case of horizontally moving door leaves, this edge is usually vertical. Accordingly, the security zone is usually vertical. Depending on the mode of operation of the reflex radiation scanner, the security zone can extend over an area of the vertical length of the relevant door leaf or over the entire vertical length of the door leaf. A reflex radiation scanner should expediently be arranged at the upper end of the door leaf moving more slowly in the opening direction of movement (in the case of the telescopic sliding door) and / or at the top close to the frame section, behind which a door leaf moves during the door opening movement. In such an installation position, the reflex radiation scanner is protected from being stepped on by users of the sliding door with shoes and being soiled in the process. Depending on the arrangement and alignment of the reflex radiation scanner, the security zone can be set up more or less into the gap or outside close to the gap entrance. If a finger or some other object enters such a security zone when the door is opened, it reflects radiation from the transmitter of the reflex radiation scanner to the radiation receiver of the reflex radiation scanner; when this reflected radiation is detected, the security device signals the presence of an object in the security zone, whereupon the drive device is caused by the control device to interrupt a further displacement movement of the moving door leaf.

Since the detection of objects can take place in front of the entrance to the gap and in particular without contact if the security zone is set up accordingly, the security device can react very quickly if an object enters the security zone, which can prevent the object from entering the edge of the gap at all of the overlap area. It is also not necessary for the object to come into contact with the relevant door leaf or frame section before the safety device responds. An object can be detected as soon as it penetrates the beam path of the reflex radiation scanner, before it even comes into contact with the sliding door. This is also used to speed up the reaction of the security system. The sliding door according to the invention is thus distinguished in a special way in that its security system reacts very quickly and reliably, can be implemented with simple means and can be installed in a space-saving manner with little effort.

A main area of application of the invention is automatic elevator sliding doors, in particular telescopic sliding doors, although the invention is not intended to be limited thereto.

Movable door leaves of an automatic sliding door can have a relatively large mass and thus also a relatively large inertia, which can have a disadvantageous effect in the emergency stop process, i.e. the process of interrupting the sliding movement of a door leaf in question when an object penetrates the security zone. In some automatic sliding doors according to the state of the art, for example, it was observed that door leaves did not immediately switch to the mechanical stop state when the electrical drive energy was removed, but rather continued to move slightly due to their inertia. This overrun of the door leaf in question could be sufficient to allow any objects to penetrate into the free-running gap in the overlap area between the door leaf and the other door element in question causing bruises in the process. This effect is also the result of an insufficiently fast response behavior or reaction behavior of the safety system of the sliding door.

Furthermore, according to the invention, the control device is set up to cause the electric drive device to exert an active force on the door element which is opposite to the force which caused the door element to shift in the particular direction of movement when the first door element is shifted in this way in the specific direction of movement, the safety device signals the presence of an object in the safety zone. The specific direction of movement is usually the direction of door opening.

In general, this can also apply to telescopic sliding doors and to non-telescopic sliding doors. Here, too, the first door element that comes into question is mainly a door leaf. A further movable door element (in the case of a telescopic sliding door) or a door frame section or frame post in the manner already explained above is predominantly possible as the second door element.

The basic idea is to generate a force opposing an inertial movement of the door leaf in question immediately after the presence or penetration of an object into the security zone and to exert it briefly on the door leaf and thus cause the door leaf to stop immediately or even to move the door leaf back slightly.

The counterforce is normally generated by appropriate control of an electric drive motor of the control device with a pulse of electrical energy ("thrust reversal pulse") in order to bring about a drive reversal or to overcome the inertia lag of the drive system.

According to a variant of the invention, the maximum electrical drive energy available in the drive system can be provided for the engine during the thrust reversal pulse.

The electrical energy pulse preferably has a duration in the range from 10 ms to 500 ms, preferably in a range from 50 ms to 250 ms.

According to the invention, the control device is able to determine the duration of the pulse of electrical energy to generate the oppositely directed force from the current displacement position and / or the current displacement speed of the first door element when it is moved in the particular direction of movement.

The first door element is preferably a door leaf and the second door element is a door frame section or a further door leaf of a telescopic sliding door.

At least the first door element preferably comprises or is formed from a glass pane.

The sliding door can be, for example, an elevator door, in particular a telescopic sliding door of an elevator car or an elevator shaft.

Fig. 1a

zeigt in einer stark vereinfachten Darstellung eine Frontansicht einer automatischen Schiebetür im geschlossenen Zustand, wobei ein oberer Bereich des Türrahmens teilweise ausgebrochen dargestellter ist, um die Antriebseinrichtung zu verdeutlichen.

Fig. 1b

zeigt eine Schnittansicht der Schiebetür aus Fig. 1a entsprechend der Schnittebene b-b in Fig. 1a.

Fig. 2a

zeigt die Schiebetür aus Fig. 1a und Fig. 1b im nahezu vollständig geöffneten Zustand in einer Frontansicht entsprechend Fig. 1a.

Fig. 2b

zeigt eine Schnittansicht der Schiebetür aus Fig. 2a entsprechend der Schnittebene b-b in Fig. 2a.

Fig. 3a

zeigt die Schiebetür in einer Momentaufnahme während des Türöffnungsvorgangs in einer Frontansicht entsprechend Fig. 1a und Fig. 2a, wobei angedeutet ist, dass eine Person in die Sicherungszone eingreift.

Fig. 3b

zeigt eine Schnittansicht der Schiebetür aus Fig. 3a mit der Schnittebene b-b in Fig. 3a.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawings.

Fig. 1a

shows, in a greatly simplified representation, a front view of an automatic sliding door in the closed state, an upper area of the door frame being shown partially broken away in order to clarify the drive device.

Figure 1b

FIG. 4 shows a sectional view of the sliding door from FIG Fig. 1a corresponding to the section plane bb in Fig. 1a .

Fig. 2a

shows the sliding door Figures 1a and 1b in the almost completely open state in a front view accordingly Fig. 1a .

Figure 2b

FIG. 4 shows a sectional view of the sliding door from FIG Fig. 2a corresponding to the section plane bb in Fig. 2a .

Fig. 3a

shows the sliding door in a snapshot during the door opening process in a front view accordingly Figures 1a and 2a , it being indicated that a person is intervening in the security zone.

Figure 3b

FIG. 4 shows a sectional view of the sliding door from FIG Fig. 3a with the section plane bb in Fig. 3a .

The automatic sliding door shown in the figures is a telescopic sliding door with a frame 2 and two door leaves 3, 5, which during the opening and closing processes of the telescopic sliding door are aligned parallel to each other in two parallel shifting planes E3, E5 one behind the other and move horizontally to each other. The door leaves 3.5 can, for example, be made of glass panes and be transparent. A drive device 7 is used to open or close the telescopic sliding door on request, the in Fig. 1a positioned on the right and according to Figures 1a and 1b Door leaf 3 positioned somewhat further back in displacement plane E3 moves faster than door leaf 5 positioned in somewhat further forward displacement plane E5 The leading door leaf (in the example the door leaf 3) is usually moved at about twice the speed as the other door leaf.

The two door leaves 3, 5 are at a slight distance A from one another orthogonally to the displacement planes E3, E5, so that they move into the closed position according to FIG. 1 without touching one another along the displacement planes E3, E5 Fig. 1a and in the open position according to Fig. 2a can be moved. Due to the different speeds of movement of the door leaves 3.5, when the telescopic sliding door is opened, there is an increasingly larger overlap O (that is, the mutual overlap of the two door leaves 3.5 - seen in the direction orthogonal to the displacement planes E3, E5 - increasing ) with a vertical edge which coincides with the trailing vertical edge 9 of the slower moving door leaf 5 in the opening movement direction. The two door leaves 3, 5 delimit a narrow vertical gap 11 running along the edge 9.

Due to the different speeds of movement of the two door leaves 3, 5, with telescopic sliding doors of this type, there is the risk that the faster moving door leaf 3 moves objects lying thereon laterally into the gap 11 during the opening process. This is particularly critical if a person's fingers, in particular a child's little fingers, get on or into the gap 11 in this way and suffer bruises in the process. It has often been shown in the past that small children like to touch the surface of glass panes, including the glass pane door leaves of telescopic doors. This can easily lead to the situation described above.

The present invention addresses this problem and offers a particularly advantageous possibility of preventing objects from penetrating into the gap between the door leaves 3, 5.

For this purpose, the invention offers a reliable and simple way of monitoring a security zone 13, which extends close to the column entrance along the edge 9 of the overlap O of the two door leaves 3, 5, and the immediate prevention or interruption of the door opening movement of the two door leaves if an object is located in the security zone 13 or penetrates therein.

For this purpose, a safety device is provided which has a reflex light switch 15, which in the example is attached to the upper end of the slower moving door leaf 5 and is oriented so that it emits a light beam 17 vertically downwards with its radiation transmitter 19. This light beam 17 defines the security zone 13 to be monitored. The reflex light scanner 15 also has a radiation receiver 21 or radiation sensor. The reflex light scanner 15 works in such a way that it reacts to light from its radiation transmitter 19, which is reflected from an object in the security zone 13 to the radiation receiver 21, but not to the light from its radiation transmitter 19, which unhindered the security zone 13 from top to bottom happens.

In Figures 3a and 3b a situation is indicated in which a person 23 reaches into the safety zone 13 with one hand 25. The person 23 interrupts the downward light beam 17 with the hand 24 and there is a (normally diffuse) back reflection of light from this light beam 17 to the reflex light scanner 15 by the hand 24. The light receiver 21 of the reflex light scanner 15 registers what is reflected back in this way Light, which is interpreted as the presence of an object in the security zone 13. The reflex light scanner 15 is in data transmission connection with a control device 25 of the telescopic sliding door. The control device 25 receives a fault signal from the reflex light scanner 15 when the presence of an object in the security zone 13 in the manner explained above is captured.

The control device 25 also serves to control the door drive device 7, ie it generates control and switching commands for an electric motor 27 in order to supply it with electrical drive energy in a controlled manner and to specify the respective motor direction of rotation. Depending on the direction of rotation of the electric motor 27, the door leaves 3, 5 move in the opening direction of movement or in the closing direction of movement. The door drive device 7 shown in greatly simplified form in the figures is a cable drive in which the electric motor 27 drives a pulley 31 to the right above the door opening 4 via a transmission belt 29 or the like, the pulley 31 being two cylindrical concentric to the pulley axis Has deflecting roller sections 33, 35, of which the deflecting roller section 33 has a larger diameter than the deflecting roller section 35. Each of the two deflecting roller sections 33, 35 is wrapped by a respective endless pull cable 37, 39 and is used to drive and deflect it. A second deflection roller 41 is rotatably arranged to the left above the door opening 4 and also has two cylindrical deflection roller sections 43, 45 with correspondingly different diameters arranged concentrically to its deflection roller axis, which are looped around by the endless pull cables 37, 39 and serve to deflect them. The faster moving door leaf 3 is connected to the lower strand 36 of the endless pull rope 37, which runs around the pulley sections 33, 43 with a larger diameter, via a driver element 47, whereas the other door leaf 5 is connected to the lower run 38 of the endless pull rope 39, which runs around the pulley sections 35, 45 is connected via a driver element 49. If the electric motor 27 is controlled in such a way that it causes the deflection roller 31 to rotate in a clockwise direction (based on Fig. 1a ) drives, the driver elements 47,49 move with the lower strands 36,38 in Fig. 1a to the left, so that the door leaves 3.5 also in the door opening direction of movement moved to the left. If the electric motor 27 is controlled in such a way that it causes the deflection roller 31 to rotate counterclockwise (based on Fig. 2a ) drives, the door leaves 3.5 are out of their open position according to Fig. 2a moved in the direction of closing movement to the right with the lower strands 36,38.

Since the pull rope 37 revolves around the pulley sections 33, 43 with the larger diameters, it has a greater circulating speed than the other pull rope 39, which revolves around the pulley sections 35, 45 with the smaller diameters. Accordingly, the door leaf 3 moved by the pull rope 37 is also displaced faster in the door closing direction of movement and the door opening direction of movement than the door leaf 5 moved by the pull rope 39. Depending on whether the control device 25 controls the electric motor 27 to rotate clockwise or counterclockwise, the Door leaves 3.5 shifted in the door closing movement direction or in the door opening movement direction.

It should be clearly emphasized at this point that the pull cable drive device 7 explained above was presented merely as an example as a suitable drive device for a sliding door according to the invention. Other drive devices, such as spindle drives, linear motor drives, etc., can also be used as door drives.

It is only essential that the relevant drive motor of the drive device reacts quickly to direction reversal control instructions of the relevant control device for the reasons explained below.

If the in Figures 3a and 3b If, in the illustrated case, the security device detects the presence of an object 25 in the security zone 13, the control device 25 reacts to this immediately with the delivery a direction reversal control instruction to the electric motor 27, so that the electric motor 27 is not only deprived of the electrical drive energy for the current displacement of the door leaves 3, 5 in the door opening direction of movement, but also the electric motor 27 a short pulse of electrical drive energy for reversing the direction of movement ("thrust reversal pulse") receives. In this way, a further inertial movement of the door leaves 3, 5 in the door opening direction of movement after the relevant electrical drive energy has been suppressed in response to a fault signal from the reflex light switch 15 is actively counteracted. This ensures that after an object 25 has been detected in the security zone 13, any further movement of the door leaves 3, 5 in the direction of movement of the door opening is stopped as quickly as possible. The duration of such a "thrust reversal pulse" can optionally be selected depending on the mass or inertia of the door leaves 3.5.

It should also be added that a second safety zone 13 'on the frame 2 at the top left of the door opening 4, a corresponding reflex radiation button 15' defines and monitors this second safety zone 13 'in order to ensure that an object approaches the overlap gap 6 between the to detect the door opening 4 on the left limiting frame section 8 and the second door leaf 5 and in the case of the detection of an object in the second security zone 13 'to cause the control device to trigger an emergency stop here at least the second door leaf 5 in the manner as described in relation to the detection of an object in the security zone 13 has been described.

Claims (12)

1. Sliding door, in particular an elevator sliding door, having a door frame and at least one first door element (3) which can be displaced relative to a second door element (5) to form a common overlap (O), a drive device (7) for displacing the first door element (3), a security device (15) for interrupting any displacing movement of the first door element (3) during an entry of an object (24) into a security zone (13) which extends, on an edge (9) of the overlap (O) running transversely to the direction of movement of the first door element (3), along this edge (9), and a control device (25) for controlling the drive device (7) and the security device (15), the security device having a radiation source (19) and a radiation sensor (21) for monitoring the security zone (13) by means of radiation from the radiation source (19), and the control device (25) being configured to cause the drive device (7) to interrupt any displacing movement of the first door element (3) when the security device (15) signals the presence of an object (24) in the security zone (13), the radiation source (19) and the radiation sensor (21) being arranged at one end of the security zone (13) and being jointly designed as a reflex radiation sensor (15) which responds to radiation from the radiation source (19) which is reflected from a possible object (24) in the security zone (13) to the radiation sensor (21), the reflex radiation sensor (15) being arranged and designed so that it does not respond to radiation from its radiation source (19) which passes unhindered through the security zone (13), the radiation source (19) emitting the radiation as a directed beam vertically downwards, the installation location of the radiation source (19) and the radiation sensor (21) being an upper end of the door, characterised in that the control device (25) is configured to cause the electric drive device (7) to exert an active force on the first door element (3) which is directed against the force that caused the displacement of the first door element (3) in the specific direction of movement when the security device (15) signals the presence of an object (24) in the security zone during such a displacement of the first door element (3) in the specific direction of movement, in that the electrical drive device (7) can be triggered by the controlled supply of electrical energy to alternately generate a force that displaces the first door element (3) in the specific direction of movement or a force directed in the opposite direction, the control device (25) being configured to supply at least one pulse of electrical energy to the electrical drive device (7) in order to trigger it to generate the force directed in the opposite direction when the security device signals the presence of an object (24) in the security zone (13) during a displacement of the first door element (3) in the specific direction of movement, and in that the control device (25) is configured to determine the duration of the pulse of electrical energy for generating the force directed in the opposite direction depending on the current displacement position and/or the current displacement speed of the first door element (3) during its displacement in the specific direction of movement.
2. Sliding door according to claim 1, characterised in that the reflex radiation sensor (15) is designed as a reflex light sensor.
3. Sliding door according to claim 2, characterised in that the radiation source (19) comprises at least one light emitting diode, preferably an infrared LED and/or laser diode, and in that the radiation sensor (21) comprises at least one photodiode and/or at least one phototransistor.
4. Sliding door according to claim 1, characterised in that the reflex radiation sensor is designed as a reflex ultrasound sensor.
5. Sliding door according to any of the preceding claims, characterised in that the reflex radiation sensor (15) functions according to a triangulation principle and/or according to a radiation transit time measuring principle.
6. Sliding door according to any of the preceding claims, characterised in that the first door element is a door leaf and in that the second door element is a door frame portion or a further door leaf.
7. Sliding door according to claim 6, wherein the reflex radiation sensor is arranged on the door frame.
8. Sliding door according to any of the preceding claims 1-5, characterised in that it is a telescopic sliding door and in that the first door element (3) and the second door element (5) are door leaves of the telescopic sliding door which can be telescopically displaced, the first door element (3) being able to be displaced faster than the second door element (5) to form the common overlap (O) and the reflex radiation sensor (15) being arranged on the second door element (5).
9. Sliding door according to any of the preceding claims, characterised in that the displacing movement of the first door element (3) relative to the second door element (5) runs in the horizontal direction and in that the reflex radiation sensor (15) is arranged at the upper end of the second door element (5), such that the security device (15) can monitor the security zone (13) from above.
10. Sliding door according to any of the preceding claims, characterised in that the electrical energy pulse has a duration which is in a range of from 10 ms to 500 ms, preferably in a range of from 50 ms to 250 ms.
11. Sliding door according to any of the preceding claims, characterised in that at least the first door element (3) comprises a glass pane or is formed from such a glass pane.
12. Sliding door according to any of the preceding claims, characterised in that it is a telescopic sliding door of an elevator car or an elevator shaft.

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