Door drive device with two independent, movable carriers

Description

[0001] The invention relates to a door drive device for opening and closing corresponding elevator door leaves of elevator doors of an elevator according to the preamble of claim 1.

[0002] EP 0 332 841 B1 describes a door drive device for opening and closing corresponding elevator door leaves of an elevator. One elevator door leaf is a cabin door leaf, and the other elevator door leaf is a shaft door leaf. The door drive device has a first driver, which acts on a first coupling element arranged on the shaft door leaf to open it, and a second driver, which acts on a second coupling element arranged on the shaft door leaf to close it. The first driver and the second driver can be moved in an opening direction and a closing direction of the elevator door by means of a drive unit.The two carriers, in the form of carrier skids, are part of a coupling mechanism and their distance from each other is adjustable by means of a parallelogram linkage with two adjusting elements, each pivotable about a pivot axis. The two carrier skids can thus assume a non-spread position and a spread position. In the non-spread position, the two carrier skids can be guided between two coupling elements of a shaft door leaf, allowing the elevator car to pass a floor and thus a shaft door.When an elevator car is correctly positioned at a floor level, the two drive skids are located between the two coupling elements arranged side by side on the shaft door leaf. They can be moved laterally towards these elements (spread apart) to unlock the shaft door leaf and simultaneously transfer the opening and closing movement of the car door leaf to the shaft door leaf without backlash and in perfect synchronicity. This moves the two drive skids from their unspreaded to their spread position. The distance between the two drive skids is adjusted by a door drive unit attached to a car door frame via a linear drive mechanism (e.g., a belt drive), which also powers the opening and closing movements of the car door leaf.

[0003] For the described passage past a shaft door, the coupling with a shaft door leaf, and the subsequent opening of the shaft door to function smoothly, the coupling elements on the shaft door leaves of the different floors must be aligned very precisely and, in particular, symmetrically with respect to the drive skids. Specifically, the distance of all coupling elements in the opening and closing directions to the drive skids in their unspread position must be within a precisely defined range, for example, + / - mm. This alignment, which must be carried out manually by a technician during elevator installation or maintenance, can be very time-consuming, especially in buildings with many floors.

[0004] In contrast, the object of the invention is, in particular, to propose a door drive device that does not require time-consuming adjustments and thus enables quick and cost-effective installation and maintenance of an elevator system with the door drive device according to the invention. According to the invention, this object is achieved with a door drive device having the features of claim 1.

[0005] The inventive door drive device for opening and closing corresponding elevator door leaves of an elevator, in the form of a cabin door leaf and a corresponding shaft door leaf, has a first driver which acts on a first coupling element arranged on the first elevator door leaf to open the first elevator door leaf, and a second driver which acts on a second coupling element arranged on the first elevator door leaf to close the first elevator door leaf. The first driver and the second driver can be displaced in an opening direction and a closing direction of the first elevator door by means of a drive unit.According to the invention, the drive unit has a first drive for relocating the first driver and a second drive for relocating the second driver, and the first driver and the second driver can be relocated independently of each other in the opening direction and in the closing direction by means of the drive unit.

[0006] The ability to independently adjust the two drive elements allows the door drive to reliably open the first elevator door leaf even when, with the elevator doors closed, the distance between the first coupling element and the first drive element differs significantly from the distance between the second coupling element and the second drive element. This eliminates the need for such precise and time-consuming adjustments of the coupling elements. For example, it is sufficient for the actual position of the first elevator door leaf in its closed position to deviate from a theoretical position by up to 2 to 4 cm in either the opening or closing direction. More generally, the door drive with two independently adjustable drive elements is more flexible and robust than a door drive with coupled drive elements.A further advantage of the door drive device according to the invention is that not all shaft doors on the floors served by the elevator need to be of the same design. The independent movement of the two actuators makes it possible to open and close shaft doors of different designs.

[0007] Elevator doors can have door leaves that open in only one direction, i.e., so-called side-opening single-leaf doors, or door leaves that open outwards from the center. Elevator doors that open from the center typically have two door drive devices. The following discussion focuses on elevator doors with door leaves that open in only one direction, i.e., in the opening direction. The described door drive devices can be adapted to elevator doors that open from the center with minor adjustments that are obvious to a person skilled in the art.

[0008] Corresponding elevator door leaves or doors are defined here as elevator door leaves or doors that open and close together when the elevator car stops on a floor. When the elevator car stops on a floor, the corresponding elevator door leaves and doors are arranged one behind the other in a horizontal direction.

[0009] The first and second drive elements have a particularly elongated, narrow shape and are designed, for example, as elongated rods. They are aligned parallel to the direction of movement of the elevator car and thus perpendicular to the opening and closing directions of the elevator doors, which are primarily horizontal. This elongated shape enables the familiar function of beginning to open the elevator doors before the elevator car has reached its final position on a floor.

[0010] The first and second coupling elements, as well as any additional coupling elements that may be present, are designed as rollers. The rollers are arranged so that they can rotate freely around an axis of rotation oriented perpendicular to the corresponding cabin door leaf. This allows the carrier to roll off the roller-type coupling element with minimal resistance when the elevator door opens prematurely, as described.

[0011] The action of a driver of the door drive device on a coupling element arranged on an elevator door leaf is understood here to mean that the driver exerts a force on the corresponding coupling element and displaces the coupling element in the opening or closing direction. Additionally, the coupling element can thereby also perform a movement in a direction deviating from the opening and closing direction, which, for example, serves to unlock a locking mechanism of an elevator door.

[0012] The first and second drivers, as described above, can be moved independently of each other in the opening and closing directions, and thus, in particular, horizontally. This means that the two drivers are not mechanically coupled, which allows for the described independent movement. The first and second drivers can therefore each be moved individually in the opening and closing directions. Specifically, the two drivers are moved along a common line. While this does impose certain limitations on the relative movement of the two drivers, these limitations do not affect the aforementioned independent movement. In this case, the two drivers can be moved towards each other until they touch or are in contact with one another.

[0013] In an embodiment of the invention, the first coupling element arranged on the first elevator door leaf of the first elevator door can be displaced in a first unlocking direction that differs from the opening and closing directions when moved in the opening direction. The first coupling element is mechanically coupled to a first locking mechanism of the first elevator door such that the first locking mechanism is unlocked by the aforementioned displacement of the first coupling element in the first unlocking direction. Advantageously, this allows the first elevator door to be unlocked by the interaction of the first follower and the first coupling element, and a separate actuator for unlocking the first elevator door is not required.

[0014] The aforementioned first locking mechanism secures the first elevator door leaf, to which the first follower is attached, in its locked position, for example, relative to a frame of the corresponding first elevator door. When the first locking mechanism is unlocked, i.e., moved into its unlocked position, the elevator door leaf can be moved relative to the frame, thus opening the elevator door.

[0015] The first coupling element can only be moved into the first unlocking direction if the first elevator door is completely closed and thus the first coupling element is in a corresponding closed position.

[0016] The first coupling element can, for example, be arranged on a lever that is rotatable about an axis of rotation perpendicular to both the opening direction and the first unlocking direction. The lever is designed such that, without interaction with the first driver, its weight distribution places it in a position where the first locking mechanism, coupled to the lever via a rod, is engaged. When the first driver acts on the first coupling element in the opening direction, the first coupling element is displaced not only in the opening direction but also in the perpendicular direction of the first unlocking direction. This causes the lever to rotate about its axis of rotation and transmits the movement of the first coupling element via the rod to the first locking mechanism, thereby unlocking it.

[0017] It is also possible that the first locking mechanism of the elevator shaft door is operated independently of the coupling elements, for example with an actuator or an electromagnet, and thus locked and unlocked.

[0018] In this embodiment of the invention, the first actuator for opening a second elevator door leaf corresponding to the first elevator door leaf of a second elevator door acts on a third coupling element arranged on the second elevator door, and the second actuator for closing the second elevator door leaf of the second elevator door acts on a fourth coupling element arranged on the second elevator door. In other words, not only the first elevator door but also the second elevator door is opened and closed by means of the two actuators. Thus, no separate drive is required for moving the second elevator door leaf of the second elevator door.

[0019] The third and fourth coupling elements are designed analogously to the first and second coupling elements. The drive unit includes, in particular, a first drive for moving the first carrier and a second drive for moving the second carrier. The third and fourth coupling elements can be arranged directly on the second elevator door leaf. They can also be arranged on a component of the second elevator door that is permanently connected to the second elevator door leaf. Such a component could, for example, be a so-called carriage from which the second elevator door leaf is suspended.

[0020] In one embodiment of the invention, a second elevator door leaf corresponding to the first elevator door leaf of a second elevator door is permanently coupled to the drive unit and can thus be moved directly by the drive unit in the opening and closing directions. This eliminates the need for coupling elements on the second elevator door leaf of the second elevator door.

[0021] A permanent coupling of the second elevator door leaf to the drive unit is understood here to mean that a drive connection exists that cannot be interrupted during normal elevator operation, for example, via a connection to a rotor of a linear motor in the drive unit or by means of a chain or belt between the drive unit and the second elevator door leaf. The drive connection is therefore not implemented via a driver and a coupling element.

[0022] The drive unit features a first drive for repositioning the first carrier, a second drive for repositioning the second carrier, and a third drive for repositioning the second door leaf of the second elevator door. This allows for particularly flexible repositioning of the two carriers and the second elevator door leaf.

[0023] In one embodiment of the invention, at least two of the drives of the drive unit are designed as linear motors. The linear motors have a common stator and each has a rotor. These rotors can be moved independently of one another along the common stator. This advantageously means that only one stator is required for the two or three linear motors.

[0024] It is also possible that the drive unit has electric motors with a rotating output shaft. The individual electric motors are then each coupled to the drive lugs and, if applicable, to the second elevator door leaf of the second elevator door via a chain or belt.

[0025] In this embodiment of the invention, the first driver can be displaced in a second unlocking direction, differing from the opening and closing directions, via contact with the first coupling element or the third coupling element. The first driver is also mechanically coupled to a second locking mechanism of the second elevator door such that the second locking mechanism is unlocked by the aforementioned displacement of the first driver in the second unlocking direction. Advantageously, this allows the second elevator door to be unlocked by the interaction of the first driver and the first or third coupling element, eliminating the need for a separate actuator for unlocking the second elevator door.

[0026] The aforementioned second locking mechanism, analogous to the first locking mechanism mentioned above, secures the second elevator door leaf in its locked position, for example, against a frame of the corresponding elevator door. When the second locking mechanism is unlocked, i.e., moved into its unlocked position, the elevator door leaf can be moved relative to the frame, thus opening the elevator door.

[0027] The first driver can only be moved into the second unlocking direction if the second elevator door is completely closed and the first driver is therefore in a corresponding closed position.

[0028] The term "displacement of the first drive element in the second displacement direction" here means that at least part of the first drive element is displaced in the second displacement direction. The first drive element can, for example, be designed in two parts. An elongated support element is connected to a base element via two pivot levers. Due to its own weight, the support element assumes a position at maximum distance from the base element when no force is applied. The base element can be displaced by the drive unit in both the opening and closing directions. As soon as the support element, through a corresponding displacement of the base element in the opening direction, contacts the first or third coupling element, it is pivoted towards the base element by the aforementioned pivot levers. In doing so, it is displaced, among other things, perpendicular to the opening direction and thus in the second unlocking direction.This displacement in the second unlocking direction is transferred via a rod to the second locking mechanism, which is thereby unlocked.

[0029] It is also possible that the first locking mechanism of the elevator shaft door is operated independently of the coupling elements, for example with an actuator or an electromagnet, and thus locked and unlocked.

[0030] In this embodiment of the invention, the first elevator door is designed as a shaft door and the second elevator door as a cabin door. The door drive device is thus arranged on the elevator cabin, in particular on the frame of the cabin door, and is moved between floors together with the elevator cabin. Therefore, only one door drive device is necessary, since it moves with the elevator cabin to the different shaft doors, allowing them to be opened and closed.

[0031] However, it is also possible that the first elevator door is a cabin door and the second elevator door is a shaft door. In this case, the door drive device is located on a shaft door, specifically on the frame of a shaft door.

[0032] Further advantages, features, and details of the invention will become apparent from the following description of exemplary embodiments and from the drawings, in which identical or functionally equivalent elements are provided with identical reference numerals. The drawings are schematic only and not to scale.

[0033] This shows: Fig. 1 a cabin door of an elevator cabin of an elevator with a door drive device, wherein one cabin door leaf of the cabin door is closed, Fig. 2 the cabin door made of Fig. 1 with a partially open cabin door leaf, Fig. 3 a second embodiment of a cabin door of an elevator cabin of an elevator with a door drive device, Fig. 4 a mechanically operated first locking mechanism for a shaft door leaf of a shaft door and Fig. 5 a mechanically operated second locking mechanism for a cabin door leaf of a cabin door.

[0034] Fig. 1 und 2 Figure 12 schematically shows a door drive device 12 for a side-opening single-leaf door, attached to an elevator car 10 of an elevator (not shown in detail). The elevator car 10 has a door opening 14, which can be closed by a car door leaf 16 of a car door 17. The door drive device 12 is arranged on a door support 18 attached to the elevator car 10. The car door leaf 16 is attached to a carriage 20, which is horizontally displaceable along a guide rail 22 fixed to the door support 18 and can be moved between a closed and an open door leaf position by a drive unit 24.

[0035] The drive unit 24 has an elongated stator 26 running parallel to the guide rail 22. The stator 26, together with a first rotor 28, forms a first linear motor 30. The first rotor 28 can be moved along the stator 26 by means of a corresponding control unit (not shown). The first rotor 28 is fixed and thus permanently connected to the carriage 20 and thus coupled to it, so that the carriage 20, and thus the cabin door wing 16, can be moved directly by the first linear motor 30, and thus by the drive unit 24, to open in an opening direction 32 and to close in a closing direction 34. The opening direction 32 and the closing direction 34 run horizontally and parallel to the guide rail 22 and the stator 26.

[0036] The door drive device 12 serves not only to open and close the cabin door leaf 16, but also to open and close a corresponding shaft door leaf 37 of a shaft door 39 with a first coupling element 36 and a second coupling element 38. The shaft door 39 is represented by the shaft door leaf 37 (shown with dashed lines) and the two coupling elements 36 and 38. The two coupling elements 36 and 38 are designed as rollers and are arranged so that they can rotate freely about an axis of rotation oriented perpendicular to the shaft door leaf 37. The shaft door 39 can be referred to as a first elevator door and the shaft door leaf 37 as a first elevator door leaf. The cabin door 17 can be referred to as a second elevator door and the cabin door leaf 16 as a second elevator door.

[0037] The drive unit 24 has a second rotor 40, on which an elongated first driver 42 is arranged. Like the first rotor 28, the second rotor 40 can be displaced along the stator 26 when appropriately controlled and, together with the stator 26, forms a second linear motor 44. The drive unit 24 also has a third rotor 46, on which an elongated second driver 48 is arranged. Like the first rotor 28 and the second rotor 40, the third rotor 46 can be displaced along the stator 26 and, together with the stator 26, forms a third linear motor 50. The three linear motors 30, 44, and 50 thus share a common stator 26. The second rotor 40 and the third rotor 46, and therefore the first driver 42 and the second driver 48, can be displaced independently of each other along the stator 26.

[0038] The first carrier 42 and the second carrier 48 are aligned parallel to a displacement direction 51 of the elevator car 10 and thus perpendicular to the horizontally running opening direction 32 and closing direction 34. The elongated shape makes it possible to begin opening the shaft door 37 before the elevator car 10 has reached its final position on a floor.

[0039] In Fig. 1 The cabin door leaf 16 and the corresponding shaft door leaf 37 are completely closed. The two drivers 42 and 48 are positioned so that they can be guided between the two coupling elements 36 and 38 in the displacement direction 51 of the elevator cabin 10. This allows the elevator cabin 10 to be moved past a floor and thus past a shaft door with a shaft door leaf without contact between the door drive device 12 and the shaft door leaf. Starting from the position in the Fig. 1 The cabin door wing 16 and the corresponding shaft door wing 37 can be opened in the position shown for the aforementioned components.

[0040] The first driver 42 and the first coupling element 36 are arranged relative to each other such that as soon as the elevator car 10 is at or shortly before its final position on a floor, the first driver 42 can act on the first coupling element 36 in such a way that the shaft door leaf 37 can be displaced in the opening direction 32 via the first driver 42. The first driver 42 is then positioned as shown in Fig. 2 The first coupling element 36 is shown and transmits a force applied by the second linear motor 44 to the coupling element 36 in the opening direction 32. This positioning of the first driver 42 relative to the first coupling element 36 is shown in the Fig. 2 shown in which the cabin door wing 16 and the corresponding shaft door wing 37 are partially open.

[0041] To open the shaft door wing from the in Fig. 1 To open the individual components in the position shown, the first driver 42 is moved in the opening direction 32 by means of the second linear motor 44 until it abuts the first coupling element 36. With a further movement in the opening direction 32, the first driver 42 acts on the first coupling element 36 and moves the first coupling element 36, and thus the shaft door leaf 37, in the opening direction 32. This opens the shaft door leaf 37.

[0042] At the same time, the cabin door wing 16 is opened synchronously with the shaft door wing 37 by means of the first linear motor 30.

[0043] Before opening the shaft door wing 37 and the cabin door wing 16, a [missing word] is placed in the Fig. 1 und 2 The first locking mechanism of the shaft door leaf (not shown) and the second locking mechanism of the cabin door leaf 16 (also not shown) are opened by means of an actuator.

[0044] To close the shaft door leaf 16 again, a force in the closing direction 34 is exerted on the second driver 38 via the second driver 48, which can be displaced by the third linear motor 50. The second driver 48 thus acts in the closing direction 34 on the second driver 38 and therefore on the shaft door leaf 37, displacing it back into the position in the Fig. 1 The closed position is shown. Simultaneously, the cabin door leaf 16 is closed synchronously with the shaft door leaf 37 by means of the first linear motor 30. After the shaft door leaf 37 and the cabin door leaf 16 have closed, the two actuators 42 and 48 are moved towards each other so that they also assume the position shown in the Fig. 1 The components assume the position shown, in which they can be guided between the two coupling elements 36 and 38. Finally, the first locking mechanism of the shaft door leaf 37 and the second locking mechanism of the cabin door leaf 16 are engaged.

[0045] The in Fig. 3 The door drive device 112 shown is very similar to the door drive device 12 in Fig. 1 und Fig. 2 It is structured, therefore only the differences between the two door drive devices will be discussed.

[0046] Regarding the door drive device 112 according to Fig. 3 The cabin door leaf 116 is not permanently coupled to a drive unit 124. Instead, a third coupling element 141 and a fourth coupling element 143 are arranged on a suspended carriage 120, and thus on a component of the cabin door 117 that is permanently connected to the cabin door leaf 116. The third coupling element 141 is designed and arranged analogously to the first coupling element 136 on the shaft door leaf 137, and the fourth coupling element 143 is designed and arranged analogously to the second coupling element 138 on the shaft door leaf 137. A first driver 142 can therefore act not only on the first coupling element 136 on the shaft door leaf 137 but also simultaneously on the third coupling element 141 on the cabin door leaf 116, and thus move not only the shaft door leaf 137 but also the cabin door leaf 116 in the opening direction 32.Similarly, a second driver 148 can thus act not only on the second coupling element 138 on the shaft door leaf 137 but also simultaneously on the fourth coupling element 143 on the cabin door leaf 116, and thus move not only the shaft door leaf 137 but also the cabin door leaf 116 in the closing direction 34.

[0047] The drive unit 124 does not have the same features as the drive unit 24. Fig. 1 und 2 Instead of three linear motors, there are two electric motors 152 and 154, each with a rotating output shaft. The first electric motor 152 is connected to the first driver 142 via a first linearly acting, rotating drive element 156. The drive element 156 can be a toothed belt, a flat belt, a V-belt, or a roller chain. This allows the first driver 142 to be moved by the first electric motor 152 along a second guide 158 in the opening direction 32 and closing direction 34. The second electric motor 154 is connected via a second, in the Fig. 3 Behind the first drive element 156, and therefore not visible, a second linearly acting, rotating drive element is connected to the second driver 148. This allows the second driver 148 to be moved by the second electric motor 154 along the second guide 158 in the opening direction 32 and closing direction 34. The two drivers 142 and 148 can thus be moved independently of each other in the opening direction 32 and in the closing direction 34.

[0048] In Fig. 4 Figure 1 shows a mechanically operated first locking mechanism for a shaft door leaf of a shaft door. The first locking mechanism 260 is located on a [unclear] in the Fig. 4 The shaft door leaf (not shown) is arranged and has a first bolt 264 that can be pivoted about a first pivot axis 262 and which can engage in a first recess 266 in a frame 268 of the shaft door. In the Fig. 4 In the position of the first bolt 264 shown, in which it engages in the first recess 266, the shaft door leaf cannot be moved in the opening direction 32, thus locking the shaft door leaf.

[0049] The first bolt 264 is connected to a lever 272 via a first, vertically oriented rod 270. The lever 272 is pivotably arranged about a second pivot axis 274 and has a first coupling element 236 at its end facing away from the first rod 270, which is analogous to the first coupling elements 36, 136 of the Fig. 1, 2 and 3The first coupling element 236 is arranged above the second pivot axis 274, so that when the first driver 242 is moved in the opening direction 32, the lever 272, together with the first coupling element 236, is initially tilted slightly downwards and only then moved in the opening direction 32. The first coupling element 236 is thus initially moved downwards in a first unlocking direction. This movement leads to a movement of the first rod 270 upwards and thus to a pivoting of the first bolt 264 about the first pivot axis 262. The first bolt 264 then pivots out of the first recess 266 and the first lock 260 is unlocked. The shaft door leaf can then be moved in the opening direction 32.

[0050] As soon as the first driver 242 no longer exerts force on the first coupling element 236, the lever 272, due to its weight distribution, wants to return to its original position. Fig. 4 The depicted position is reversed. This is possible when the shaft door leaf is closed again and the first bolt 264 can engage in the first recess 266 again. The engagement is further supported by the weight distribution of the first bolt 264.

[0051] In Fig. 5 Figure 360 ​​shows a mechanically operated second locking mechanism for a cabin door leaf. The second locking mechanism is located on a [unclear - possibly a specific component or element] in the [unclear - possibly a specific component or element]. Fig. 5 The cabin door leaf (not shown) is arranged and has a second bolt 364 that can be pivoted about a third pivot axis 362 and which can engage in a second recess 366 in a frame 368 of the cabin door. In the Fig. 5 In the position shown of the second bolt 364, in which it engages in the second recess 366, the cabin door leaf cannot be moved in the opening direction 32, thus locking the cabin door leaf.

[0052] To enable actuation of the second locking mechanism 360, the first driver 342 is designed in two parts. An elongated contact element 376 is connected to a base element 380 via two pivot levers 378. Due to its own weight, the contact element 376 assumes a position at maximum distance from the base element 380 without any force being applied. The base element 380 is separated from the one in the Fig. 5 The drive unit (not shown) can be displaced in the opening direction 32 and closing direction 34. As soon as the system element 376, through a corresponding displacement of the base element 380 in the opening direction 32, rests against the first or third coupling element 336, 341, it is pivoted towards the base element 380 by the aforementioned pivot levers 378. In doing so, it is displaced, among other things, vertically upwards and perpendicular to the opening direction 32, and thus in a second unlocking direction. This displacement in the second unlocking direction is transmitted to the second bolt 364 via a second rod 370. This causes the second bolt 364 to pivot about the third pivot axis 362. The second bolt 364 thus pivots out of the second recess 366, and the second locking mechanism 360 is unlocked. The cabin door leaf can then be displaced in the opening direction 32.

[0053] As soon as the attachment element 376 is no longer pressed against the first or third coupling element 336, 341 via the base element 380, the attachment element 376, due to its weight, wants to return to its position in Fig. 5 The depicted position is returned. This is possible when the cabin door wing is closed again and the second bolt 364 can engage in the second recess 366 again. The insertion is further supported by the weight distribution of the second bolt 364.

[0054] Finally, it should be noted that terms such as "comprising," "encompassing," etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps from other embodiments described above within the scope of the claims. Reference numerals in the claims are not to be considered as limitations.

Claims

1. Door drive device for opening and closing corresponding elevator door leaves (16, 116; 37, 137) of elevator doors (17, 39) of an elevator ( ) in the form of a cabin door leaf (16, 116) of a cabin door (16) and a corresponding shaft door leaf (37, 137) of a shaft door (39), with - a first driver (42, 142, 242, 342) which, in order to open a first elevator door leaf (37, 137) of a first elevator door (39), acts on a first coupling element (36, 136, 236, 336) arranged on the first elevator door leaf (37, 137), and - a second driver (48, 148) which acts on a second coupling element (38, 138) arranged on the first elevator door leaf (37, 137) to close the first elevator door leaf (37, 137) of the first elevator door (39), wherein the first driver (42, 142, 242, 342) and the second driver (48, 148) can be displaced by means of a drive unit (24, 124) in an opening direction (32) and a closing direction (34) of the first elevator door (39) , characterized in that the drive unit (24, 124) has a first drive (44, 152) for moving the first driver (42, 142) and a second drive (50, 154) for moving the second driver (48, 148), and the first driver (42, 142, 242, 342) and the second driver (48, 148) can be moved independently of each other in the opening direction (32) and in the closing direction (34) by means of the drive unit (24, 124).

2. Door drive device according to claim 1, characterized in that the first coupling element (236) arranged on the first elevator door leaf of the first elevator door can be moved in a first unlocking direction deviating from the opening direction (32) and the closing direction (34) when moved in the opening direction (32) and is thus mechanically coupled to a first lock (260) of the first elevator door, that the first lock (260) is unlocked via the aforementioned displacement of the first coupling element (236) in the first unlocking direction.

3. Door drive device according to claim 1 or 2, characterized in that - the first driver (142) acts on a third coupling element (141) arranged on the second elevator door to open a second elevator door leaf (116) of a second elevator door corresponding to the first elevator door leaf (137), and - the second driver (148) for closing the second elevator door leaf (116) of the second elevator door acts on a fourth coupling element (143) arranged on the second elevator door.

4. Door drive device according to claim 1 or 2, characterized in that a second elevator door leaf (16) of a second elevator door (17) corresponding to the first elevator door leaf (37) is permanently coupled to the drive unit (24) and can thus be moved directly by the drive unit (24) in the opening direction (32) and in the closing direction (34).

5. Door drive device according to claim 4, characterized in that the drive unit (24) has a third drive (30) for moving the second door leaf (16) of the second elevator door (17).

6. Door drive device according to claim 5, characterized in that at least two of the drives (30, 44, 50) of the drive unit (24) are designed as linear motors, which have a common stator (26) and in each case a rotor (28, 40, 46), wherein the said rotors (28, 40, 46) can be moved independently of one another along the common stator (26).

7. Door drive device according to one of claims 1 to 4, characterized in that the first drive (44) and the second drive (50) of the drive unit (24) are designed as linear motors, which have a common stator (26) and a respective rotor (40, 46), wherein the said rotors (40, 46) can be displaced independently of one another along the common stator (26) in a manner that is not bound to a specific direction ( ).

8. Door drive device according to one of claims 3 to 7, characterized in that the first driver (342) can be displaced via contact with the first coupling element (336) or the third coupling element (341) in a second unlocking direction that differs from the opening direction (32) and the closing direction (34) and is thus mechanically coupled to a second lock (360) of the second elevator door, that the second lock (360) is unlocked via the aforementioned displacement of the first driver (342) in the second unlocking direction.

9. Door drive device according to one of claims 1 to 8, characterized in that the first elevator door (39) is designed as a shaft door and the second elevator door (17) is designed as a cabin door.