Conveyor

Abstract

In order to provide a conveying device 1 that allows more flexible process control as a planar motor having at least one conveying section TSi constituting a conveying plane TE and at least one conveying unit 3A that can move at least two-dimensionally within this conveying plane TE, it is proposed according to the present invention that at least one coupling unit 50 is provided in the conveying device 1, that at least one coupling device 11 is arranged on the conveying unit 3A and on the coupling unit 50 for releasably coupling the conveying unit 3A to the coupling unit 50, that the conveying unit 3A and the coupling unit 50 can be at least temporarily coupled to a group of conveying units by relative movement within the conveying plane TE using a plurality of coupling devices 11, and that a plurality of coupling devices 11 in the coupled group of conveying units cooperate to limit at least one degree of freedom of movement in the relative movement between the conveying unit 3A and the coupling unit 50.

Description

[Technical Field]

[0001] The present invention relates to a conveying device as a planar motor having at least one conveying section forming a conveying plane and at least one conveying unit movable at least two-dimensionally within the conveying plane, wherein a plurality of drive coils or a plurality of movable permanent magnets are arranged in the conveying section. In this case, a plurality of drive magnets are arranged in the conveying unit, or a plurality of drive coils or a plurality of movable permanent magnets are arranged in the conveying unit. In this case, a plurality of drive magnets are arranged in the conveying section. In this case, the plurality of drive coils or the plurality of movable permanent magnets magnetically cooperate with the plurality of drive magnets to move the conveying device at least two-dimensionally within the conveying plane. Furthermore, the present invention relates to a conveying unit for the conveying device as a planar motor and a method for operating a conveying device as a planar motor. [Background technology]

[0002] Planar motors are basically known in the prior art. U.S. Pat. No. 9,202,719 discloses, for example, the basic structure and function of such planar motors. Typically, a planar motor has a conveying surface, which is typically composed of one or more conveying sections. One or more conveying units can be moved within the conveying surface. The driving force acting on the conveying units is generated by the cooperation of the magnetic fields of the conveying sections and the magnetic fields of the conveying units. To move the conveying units in a specific direction of movement, it is necessary to vary over time at least one of the magnetic fields of the conveying sections and / or the magnetic fields of the conveying units so as to follow the movement of the conveying units. However, in many cases, only one magnetic field, typically the magnetic field of the conveying section, varies over time, while the other magnetic fields, typically the magnetic fields of the conveying units, are usually constant.

[0003] The time-varying magnetic field can be generated, for example, by a coil (electromagnet) or a (e.g., rotating) moving permanent magnet, which can be arranged both in the transport unit and in the transport section. Such coils are often called drive coils. A time-invariant, i.e., a constant, magnetic field is generally generated by a permanent magnet. These components are often called drive magnets. These components can also be arranged both in the transport unit and in the transport section, depending on the embodiment of the planar motor. For easier control, the drive coils are often arranged in the transport section of the planar motor, and the drive magnets are arranged in the transport unit.

[0004] To generate a moving magnetic field in the desired direction of movement, a drive coil is typically controlled by a control device. A plurality of drive magnets are arranged at least two-dimensionally on the transport unit. These drive magnets cooperate with the operating magnetic field so that predetermined forces and moments can be applied to the transport unit in the directions of multiple degrees of freedom of the transport unit (maximum of three translational and three rotational degrees of freedom). The force and moment that moves the transport unit in one of these degrees of freedom of movement is generally called a drive force. The force and moment that is applied to the transport unit by the transport section and maintains the actual state of movement is generally called a buoyant force. The buoyant force can, for example, maintain an air gap between the transport unit and the transport section and / or offset process forces or process moments. Even in the case of a non-horizontal transport surface, for example, the position of the transport unit can be maintained constant by appropriate buoyant forces.

[0005] To enable the two-dimensional movement of the transport unit inherent in planar motors, two-dimensional cooperation between the magnetic field of the transport section and the magnetic field of the transport unit is required. In this case, one of the two magnetic fields must be time-varying in at least two dimensions, or both magnetic fields must be time-varying in at least one dimension. In this case, multiple drive coils and multiple drive magnets are advantageously arranged so that in addition to the one-dimensional movement along multiple axes generated by the transport surface, more complex two-dimensional movement of the transport unit is also possible on the transport surface. If these drive coils and drive magnets are advantageously arranged so that the transport unit can be guided and moved in all six degrees of freedom by the drive force and buoyancy force, mechanical guidance can be eliminated. In this case, bearingless planar motors are often used.

[0006] Planar motors can be used in manufacturing processes, for example as transport devices, whereby highly flexible transport processes can be realized with complex movement trajectories.

[0007] EP 3172156 and EP 3172134, for example, show such uses of planar motors as conveying devices. In this case, for example, two planar motors are arranged in a connected relationship, and multiple conveying units can move on both planar motors. This allows multiple conveying units to move independently of each other in two planes. In another configuration, one planar motor interacts with one or more endless conveyors to manipulate articles in a predetermined manner. Each of the conveying units of the planar motors can move independently in two dimensions in a vertical plane. Therefore, although the planar motor allows for highly flexible movement in the vertical plane, its flexibility is limited by the endless conveyors.

[0008] WO 2018 / 176137 A1 discloses a planar motor as a conveying device in which multiple conveying units are fixedly connected to one another by a relatively complex structure, which is used as a type of manipulating device, which is operated by moving the conveying units relative to one another, for example, to perform a vertical lifting movement. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] U.S. Patent No. 9,202,719 [Patent Document 2] European Patent No. 3172156 [Patent Document 3] European Patent No. 3172134 [Patent Document 4] International Patent Application Publication No. 2018 / 176137 [Non-patent literature]

[0010] [Non-Patent Document 1] Jansen, JW, 2007. Magnetically levitated planar actuator with moving magnets. In: electromechanical ANALYSIS and Design Eindhoven: Technische Universiteit Eindhoven DOI: 10.6100 / IR630846 Summary of the Invention [Problem to be solved by the invention]

[0011] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a conveying device as a planar motor and a corresponding conveying unit which allows for more flexible process control. [Means for solving the problem]

[0012] According to the present invention, this problem is solved by providing at least one coupling unit on the transport device, at least one coupling device being arranged on the transport unit and the coupling unit for releasably coupling the transport unit to the coupling unit, the transport unit and the coupling unit being at least temporarily coupleable to a transport unit group by relative movement in the transport plane using a plurality of coupling devices, and a plurality of coupling devices in the coupled transport unit group cooperating to limit at least one degree of freedom of the relative movement between the transport unit and the coupling unit. In this case, in particular, another transport unit or an article carrier for accommodating articles is provided as the coupling device. If another transport unit is provided as the coupling device, at least two transport units can be coupled to the transport unit group by a plurality of coupling devices. The transport units in the transport unit group can move together in the transport plane. If an article carrier is provided as the transport unit, the transport unit with the article carrier can be coupled to an article carrier group. In this case, the article carriers in the article carrier group can be moved in the transport plane by the transport unit. In this case, the coupling devices are particularly configured to be locking and / or pressure-locking. By configuring a transport unit group, for example, higher forces can be generated than with individual transport units. This allows, for example, larger loads to be transported than with individual transport units. Advantageously, this also allows higher process forces of the work process to be absorbed and / or allows larger articles to be transported. For example, the article carrier group has the advantage that different article carriers can be used, which can be easily exchanged, for example, by simply moving them relative to each other.

[0013] In particular, each of the coupling devices forms at least part of a locking device that is configured to limit another degree of freedom of relative movement between the coupled transport unit and the coupling unit, whereby the locking device can be operated in particular by the relative movement between the transport unit and the coupling unit, or an operating device is provided in the transport device for operating the locking device, thereby ensuring that the coupling is not inadvertently released and that the transport unit and the coupling device are separated.

[0014] In particular, the operating device is configured as a fixed, in particular mechanical or magnetic, operating device and / or the operating device and the actuator for operating the operating device are provided at least on the transport unit (which also includes an article carrier for accommodating articles on the transport unit) or on the connection unit, so that the locking device can be operated in different ways depending on the given boundary conditions.

[0015] Advantageously, at least one coupling element is provided in the coupling device of the transport unit and at least one receiving portion is provided in the coupling device of the coupling unit, or at least one coupling element is provided in the coupling device of the coupling unit and at least one receiving portion is provided in the coupling device of the transport unit, wherein the coupling element is arranged to cooperate with the receiving portion for releasably coupling the transport unit to the coupling unit, thereby providing a locking coupling, and wherein multiple degrees of movement can be locked by the locking coupling.

[0016] In particular, the locking device has at least one clamping element and at least one clamping opening cooperating with the clamping element, the clamping element being arranged on the connecting element and the clamping opening being arranged in the receiving opening, or the clamping element being arranged in the receiving opening and the clamping opening being arranged on the connecting element, so that an additional degree of movement can be locked in a simple manner.

[0017] Preferably, each of the coupling devices comprises at least one magnetic element arranged to generate a magnetic attraction between the transport unit and the coupling unit, whereby the coupling devices can be configured exclusively magnetically or can be provided with magnets to assist the coupling process.

[0018] Furthermore, the object of the present invention is achieved by using a transport unit, in which at least one coupling device is provided on the transport unit, which coupling device is configured to releasably couple the transport unit to a coupling unit in a transport unit group by a relative movement between the transport unit and a coupling unit in the transport plane, and the coupling device of the coupled transport unit group cooperates with the coupling unit to limit at least one degree of freedom of the relative movement between the transport unit and the coupling unit, in particular in this case the coupling device is configured as a locking and / or pressure-locking type.

[0019] Furthermore, the object of the present invention is achieved by using a method in which at least one transport unit is moved relative to a coupling unit in a transport plane, or the coupling unit is moved relative to at least one transport unit in a transport plane, and the transport unit and the coupling unit are coupled to one transport unit by the relative movement using a plurality of coupling devices, and the locking device is operated in the coupled state.

[0020] Preferably, one other conveying unit is used as a connecting unit, and multiple such conveying units are connected to form a group of conveying units, and the group of conveying units is moved within the conveying plane by at least a portion of the multiple drive magnets of one of the at least two conveying units magnetically cooperating with multiple drive coils or multiple movable drive magnets of the conveying section, or by at least a portion of the multiple drive coils or multiple movable drive magnets of one of the at least two conveying units magnetically cooperating with multiple drive magnets of the conveying section.

[0021] Preferably, the transport units are moved into a work station where a work process is performed, in which a process force acts on the transport units and / or at least one article is loaded onto the transport units, and in which case the transport units are separated into at least two of the transport units after the work process is completed.

[0022] The invention will now be described in more detail with reference to Figures 1 to 17b, which show exemplary, schematic and non-limiting preferred configurations of the invention. [Brief explanation of the drawings]

[0023] [Figure 1a] FIG. 1 is a front view of an example of a conveying device as a planar motor. [Figure 1b] FIG. 1 is a side view of an example of a conveying device as a planar motor. [Figure 2] 1 shows a possible arrangement of multiple drive coils in one transport section. [Figure 3a] 1 shows a possible arrangement of multiple movable permanent magnets in one conveying section. [Figure 3b] 1 shows a possible arrangement of multiple movable permanent magnets in one conveying section. [Figure 4a] 1 is a side view of a transport unit of a transport device as a planar motor with a coupling device; [Figure 4b]FIG. 10 is a bottom view of one transport unit of the transport device as a planar motor with one coupling device. [Figure 4c] FIG. 10 is a bottom view of a transport unit having a coupling device with another arrangement of drive magnets. [Figure 5] FIG. 1 is a front view of two transport units having multiple coupling devices. [Figure 6] 1 shows one coupling device with one bayonet joint. [Figure 7] FIG. 10 is a front view of two transport units each having one connecting device and one external operating device. [Figure 8] 8a and 8b show side views of two transport units with coupling devices in a decoupled state (FIG. 8a) and a coupled state (FIG. 8c). [Figure 9] 9a and 9b show side views of two transport units with coupling devices in a decoupled state (FIG. 9a) and a coupled state (FIG. 9c). [Figure 10] 10a and 10b show side views of two transport units with coupling devices in a decoupled state (FIG. 10a) and a coupled state (FIG. 10c). [Figure 11a] FIG. 1 is a front view of two transport units having magnetic coupling devices. [Figure 11b] FIG. 1 is a front view of two transport units having magnetic coupling devices. [Figure 11c] FIG. 1 is a front view of two transport units having magnetic coupling devices. [Figure 12a] 1 shows different variations of one transport unit group. [Figure 12b] 1 shows different variations of one transport unit group. [Figure 12c] 1 shows different variations of one transport unit group. [Figure 12d] 1 shows different variations of one transport unit group. [Figure 12e] 1 shows different variations of one transport unit group. [Figure 12f]1 shows different variations of one transport unit group. [Figure 13] 1 shows a bottle filling system with a conveying device according to the invention; [Figure 14a] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 14b] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 15a] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 15b] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 16a] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 16b] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 17a] 1 shows different embodiments of the connection between the transport unit and the article carrier; [Figure 17b] 1 shows different embodiments of the connection between the transport unit and the article carrier; DETAILED DESCRIPTION OF THE INVENTION

[0024] FIG. 1a is a front view of a typical configuration of a conveying device 1 according to the present invention. FIG. 1b is a side view of the conveying device 1. The conveying device 1 has a stator 2 that forms a conveying plane TE. In the illustrated example, the conveying plane TE is a horizontal plane having a vertical axis Z, a longitudinal axis X, and a transverse axis Y. However, other arrangements are naturally possible, for example, at right angles or inclined at a predetermined angle. The configuration mainly depends on the desired use of the conveying device 1. Here, the stator 2 is composed of a plurality of i adjacent conveying sections TSi. This allows the conveying device 1 to be constructed modularly, and conveying planes TEi with various surface areas can be realized. Of course, this modular construction is optional; one stator 2 may also be composed of only one component. Within the conveying plane TE of the stator 2, one or more conveying units (hereinafter commonly referred to as 3) can be moved in at least two dimensions. In the illustrated example, the conveying units 3A and 3B can be moved independently of each other in at least two dimensions. For example, only one axial movement is possible along the longitudinal axis X or the transverse axis Y, or even a two-dimensional movement trajectory along the Y and X axes is possible, as shown by the movement trajectory BPB of the transport unit 3B. With a suitable configuration of the transport device 1, the other four degrees of freedom of movement may also be utilized, at least to a limited extent.

[0025] For this purpose, a plurality of drive coils 6 are provided on the stator 2, in particular on the transport sections TSi, which are controlled by one (or more) planar motor controllers 5 (hardware and / or software). For example, wound wire coils or so-called PCB coils (PCB = printed circuit board) arranged on a printed circuit board are used as the drive coils 6. To generate a magnetic field, a current can be passed through the drive coils 6. Any power electronics necessary for this purpose can be arranged in the planar motor controller 5 or in the stator 2 (e.g., in the transport sections TSi). By appropriately controlling the parallel drive coils 6, a movable main magnetic field can be generated. To achieve a suitable movement trajectory of the transport units 3, the drive coils 6 are preferably arranged on the stator 2 so that the magnetic field extends in any direction within the transport plane TE. The transport plane TE is not to be understood as a plane in the mathematical sense, but rather as a flat transport surface defined by the respective stators 2, along which the transport units 3 can move. These drive coils 6 can be arranged in the plane of the stator 2, for example in groups of coils offset by 90° (see FIG. 2) or in a fishbone configuration (see, for example, Jansen, JW, 2007. Magnetically levitated planar actuator with moving magnets. In: electromechanical ANALYSIS and Design Eindhoven: Technische Universiteit Eindhoven DOI: 10.6100 / IR630846). However, as will be explained below, these drive coils 6 can also be arranged in overlapping planes.

[0026] In the example shown in FIGS. 1a and 1b, the drive coils 6 are arranged in two layers stacked in the Z direction. In the first layer, the drive coils 6y are oriented so that they can be used to generate forces in the Y and Z directions on the transport unit 3. In the second layer, the drive coils 6x are oriented so that they can be used to generate forces in the X and Z directions on the transport unit 3. To form the largest possible movement route, both layers extend almost completely across the entire transport surface TE. In the illustrated example, as is clear from FIG. 1b, the first layer with the drive coils 6y is closer to the surface of the transport unit 3 and therefore closer to the transport unit 3 in the Z direction than the second layer with the drive coils 6x. Naturally, this example is merely illustrative, and the arrangement may be reversed.

[0027] The drive coils 6x and 6y do not have to be aligned perpendicular to one another. One or more layers of drive coils 6 may be provided. Furthermore, the drive coils 6 of one layer may be arranged at any angle relative to the drive coils 6 of an adjacent layer. However, the entire drive coils 6 allow movement in both the X and Y directions. To reduce the attractive force of the permanent magnets between the transport units 3 and the transport sections TSi of the stator 2, the drive coils 6 are preferably configured as so-called air-core coils without an iron core. This prevents the transport units 3 from being strongly attracted by the drive magnets 4 in the direction of the transport plane TE. To exert a drive force on the transport units 3, a plurality of drive magnets 4, e.g., permanent magnets, are arranged on the transport units 3.

[0028] Thus, a moving magnetic field, which cooperates with the drive magnets 4, is generated by controlling the drive coils 6 to move the transport units 3. During operation, an air gap is provided between the drive coils 6 of the stator 2 and the drive magnets 4 of one transport unit 3. In addition to two-dimensional movement within the transport plane TE, a certain movement of the transport unit 3 in the vertical direction, i.e., perpendicular to the transport plane TE, here in the Z direction, is also possible. That is, the drive coils 6 also generate a (levitating) force in the Z direction. By appropriately controlling the drive coils 6, the air gap can be increased or decreased within a limited range. This allows the transport unit 3 to move vertically. In this case, the size of the vertical movement play depends on the structure of the transport device 1, in particular on the maximum magnetic field that can be generated by the drive coils 6 and the drive magnets 4, and on the weight and load of the transport unit (e.g., the weight of the transported goods). Depending on the size and dimensions of the transport device 1, the vertical movement range can be, for example, within a range of several millimeters to several tens of centimeters. The transfer units 3A and 3B can also be rotated about the Z axis, and can also be rotated about the Y and X axes within a limited range.

[0029] In the illustrated example, external mounting of the transport unit 3 may be omitted. The transport unit 3 is levitated solely by magnetic force (levitation) acting in the Z direction generated by the drive magnet 4 of the transport unit 3 and the drive coil 6 of the transport section TSi. However, the desired air gap between the drive coil 6 and the transport magnet 4 does not necessarily have to be generated or maintained exclusively magnetically; the transport unit 3 may be supported in any other manner. For this purpose, for example, any suitable mechanism, such as a mechanical mechanism, an electromagnetic mechanism, a pneumatic mechanism, etc., may cooperate. In the illustrated example, a planar motor control device 5 is provided. The drive coil 6 of the stator 2 may be controlled by the planar motor control device 5. For example, the planar motor control device 5 may be connected to a higher-level control device (not shown) to jointly control and synchronize multiple stators 2 or multiple transport devices 1.

[0030] However, the planar motor controller 5 may of course also be integrated into a higher-level controller. It is also possible to provide a section controller (hardware and / or software) for each transport section TSi or for each group of transport sections TSi. The section controllers may be integrated into the planar motor controller 5 or the higher-level controller, or may be configured as independent devices. The planar motor controller 5 and / or the higher-level controller may be connected, for example, to a user interface (not shown), e.g., a computer that can control the transport units 1. The movement trajectories of the transport units 3 may be synchronized or adjusted with one another by the planar motor controller 5 and / or the higher-level controller, for example, to avoid collisions between the transport units 3 or between the articles transported by these transport units 3. A control program for realizing the desired movement profile of the transport units 3 runs on the planar motor controller 5. However, the structure and function of planar motors are basically known. Therefore, they will not be described in detail here.

[0031] According to the present invention, at least one transport unit 3A and at least one connection unit 50 are provided in the transport device 1. In this case, at least one connection device 11 is arranged on the transport unit 3A and on the connection unit 50 to detachably connect the transport unit 3A to the connection unit 50. The transport unit 3A and the connection unit 50 can be at least temporarily connected to one transport body group by moving relative to each other within the transport plane TE using the multiple connection devices 11. In this case, these connection devices 11 cooperate within the connected transport body group to limit the relative movement between the transport unit 3A and the connection unit 50 to at least one degree of freedom of movement. In this case, according to a first variant of the present invention, the at least one connection unit 50 may be another transport unit 3B. In this case, at least two transport units 3A and 3B can be connected to one connection unit group TV by these connection devices 11. In this connected state, these transport units 3A and 3B can move together within the transport plane TE. According to a second variant of the present invention, at least one connecting unit 50 may be an article carrier OT for accommodating an article O. In this case, the transport unit 3A can be coupled together with the article carrier OT to form an article carrier group OV. The article carriers OT in the article carrier group OV can be moved in the transport plane TE by the transport unit 3A. In the following, the first variant will be described in detail based on Figures 1a to 13. The second variant will be described in detail based on Figures 14a to 17b.

[0032] In the example according to FIGS. 1a and 1b, at least two transport units 3 are provided, here transport units 3A and 3B. At least one coupling device 11 is arranged on each of the transport units 3A and 3B for detachable, in particular direct, coupling. As shown in FIG. 1a, the transport units 3A and 3B can be at least temporarily coupled to a transport unit group TV by the coupling devices 11. As a result, the transport unit group TV is moved as a single component within the transport plane TE under the control of the planar motor control device 5. This allows the transport device 1 to enable highly flexible manufacturing processes. For example, the transport unit group TV can be used to generate higher driving and buoyant forces than the individual transport units 3A and 3B.

[0033] This example can be used to transport relatively heavy items by the transport unit group TV, which, depending on the circumstances, cannot be moved or can only be transported insufficiently by individual transport units 3A, 3B. When the item is placed, for example, on only one transport unit 3A, one or more connected transport units 3B, 3C, etc. can support this transport unit 3A (loaded with the item), for example, during an acceleration phase. However, the transport unit group TV can also be used to increase the area for transporting the items. In the transport unit group TV, energy can be saved under certain conditions (depending on the weight of the transport units 3, the weight of the transported items, and the number of connected transport units 3) because one or more other transport units 3 can be moved by one or more other transport units 3. Within the scope of the present invention, "connected" can be understood as the relative movement between these connected transport units 3A, 3B being limited to at least two degrees of freedom of movement. Here, "detachable" can be understood as the ability to connect / disconnect these transport units 3 by controlling their movement. The movement control can be performed, for example, by the planar motor controller 5 or by a higher-level controller.

[0034] In the example shown in FIGS. 1a and 1b, each of the transport units 3A, 3B has a base body 9 with a substantially rectangular base. A coupling device 11 is arranged on each of the four sides of the base body 9. The coupling devices 11 are only shown schematically in the figures and are preferably designed to be compatible with each other. This generally means that each coupling device 11 of one transport unit 3 can be coupled to each coupling device 11 of another transport unit 3. To this end, the coupling devices 11 are specifically designed to a standard and are identical for each transport unit 3, so that any transport units 3 can be coupled to each other. However, naturally, different, incompatible coupling devices 11 may also be provided on different transport units 3. For example, a non-standard design is desirable when only certain transport units 3 must be coupled, but not other transport units 3.

[0035] These coupling devices 11 are configured to limit the relative movement of the coupled transport units 3A, 3B within the transport unit group TV to at least one degree of freedom of movement, in particular to at least two degrees of freedom of movement. In the example shown in Fig. 1a, for example, the coupled transport devices 11 of the transport unit group TV are configured so that only the translational degree of freedom in the X direction is locked, while (at least limited) relative movement between these transport units 3A, 3B is possible in the remaining five degrees of freedom of movement (two translational degrees of freedom in the Y direction and the Z direction, and three rotational degrees of freedom about the three axes X, Y, and Z).

[0036] For this coupling, the transport units 3A, 3B can be moved toward each other in the longitudinal direction X (or in any other direction), as shown by the arrows in Fig. 1b, for example by the planar motor control device 5, and can be detachably coupled upon contact by the coupling devices 11. Of course, to perform this coupling, one of the transport units 3A, 3B can remain stationary, and the respective other transport unit 3A, 3B can be moved alone in the direction of the stationary transport unit 3A, 3B. The coupling can be performed, for example, by moving the transport units 3A, 3B themselves (e.g., due to the inertial force of the transport units 3A, 3B and / or by generating a corresponding driving force for the transport units 3A, 3B). In Figures 1a and 1b, these connecting devices 11 are only shown diagrammatically and can be configured in various ways, in particular in a locking or pressure-locking manner, as will be illustrated in more detail below.

[0037] Furthermore, at least some of the transport units 3A, 3B may be provided with actively or passively operable locking devices (not shown in FIGS. 1a and 1b). In the coupled state, the relative movement of the transport units 3A, 3B may be limited to an additional degree of freedom by the locking devices. This may prevent, for example, undesired separation. Passive locking devices may be operated by the relative movement of the transport units 3A, 3B to be coupled. In this context, relative movement may be understood as a relative movement in one degree of freedom or as a series of relative movements in several different degrees of freedom of movement (e.g., successive translations and rotations). For example, a suitable operating device (not shown) may be provided on at least one of the transport units 3A, 3B to actively operate (lock and / or unlock) the locking device. However, the locking device may also be operated by an external operating device. An externally fixed operating device may be provided in the transport device 1, which may be arranged, for example, on the transport section TSi, as will be explained in more detail below with reference to FIG. 7. In the case of an actively operable locking device, the operating device may be, for example, a suitable electric actuator or a suitable permanent or electromagnet. In the case of a passively operable locking device, a suitable preload element, such as a spring mechanism, may be provided, which applies operating energy for the locking device, as will be explained in more detail with reference to FIG. 5. In the case of an actively operable locking device, energy may be supplied to the operating device arranged in the transport unit 3A, 3B, for example, by an electric energy store arranged in the respective transport unit 3 or in an electromagnetically inductive manner by a plurality of drive coils 6 of the stator 2. Furthermore, the locking device may be operated by gravity, as will be explained in more detail with reference to FIG. 10.

[0038] After the coupling, the transport unit group TV can be moved within the transport plane TE in the same manner as the individual transport units 3A, 3B. Furthermore, the movement of the transport unit group TV is controlled by the planar motor control device 5 or by a higher-level control device. Depending on the structure of the coupling device 11, it may be sufficient for only one of the at least two transport units, 3A or 3B, to cooperate with the drive coils 6 of the stator 2. In this case, the other transport unit 3A or 3B is essentially pulled. In the case of one transport unit group TV, only some of the drive magnets 4 of one of the coupled transport units 3A, 3B may cooperate with the drive coils 6 of the stator 2. This has the advantage that a moment can be generated, for example to offset uneven loads on the transport unit group TV.

[0039] If a higher driving force is required, for example, when transporting relatively heavier items and / or when transporting on an inclined transport surface TE, the driving magnets 4 of the two transport units 3A, 3B of the transport unit group TV may naturally cooperate with the driving coils 6 of the stator 2 to generate this driving force. Decoupling of the transport unit group TV can also be performed by moving the transport units 3A, 3B themselves (e.g., by causing the transport units 3A, 3B to generate driving forces acting in opposite directions). It is also conceivable to assist the decoupling process with a decoupling force. For example, a suitable decoupling device, such as a decoupling spring, or an electric actuator may be provided, or the decoupling force may be applied magnetically. The structure of the coupling device 11 may be variously configured, for example, a mechanical coupling device 11, a locking or snap-in coupling device 11, a magnetic coupling device 11, or any combination of these illustrated options. Possible specific embodiments will be explained in more detail below with reference to FIGS. 4 to 11c.

[0040] FIG. 2 shows another arrangement of multiple drive coils 6 on one transport section TSi of one stator 2 to form a transport plane TE. This transport section TSi is arranged so that the drive coils 6 face the drive magnets 4 of the transport units 3 during operation. Here, the transport section TSi has an approximately square bottom, but any other shape is naturally possible. To enable two-dimensional movement of the transport units 3 within the transport plane TE, the drive coils 6 are divided into multiple coil groups 6A, 6B arranged alternately in the same plane. Therefore, the coil groups 6A, 6B are spaced apart from the surfaces of the stators 2 or drive magnets 4 of the transport units 3 by the same distance in the Z direction. Each of the coil groups 6A, 6B has a specific number of drive coils 6. In this case, the orientation of the drive coils 6 of the coil group 6A is different from the orientation of the drive coils 6 of the coil group 6B. In the illustrated example, four drive coils 6 are provided for each of the coil groups 6A and 6B, and the drive coils 6 of the coil group 6A and the drive coils 6 of the coil group 6B are rotated by 90° relative to each other. However, other arrangements, classifications, and dimensional ratios are naturally possible, such as a fishbone arrangement of the drive coils 6. In this case, in particular, a known two-dimensional Halbach array of the drive coils 6 is provided in the conveying unit 3. In this Halbach array, the magnetization directions of adjacent drive magnets 4 (= multiple permanent magnets) are inclined by 90° relative to each other around the longitudinal axis of the drive magnets 4.

[0041] For example, in the variant according to FIG. 2, multiple layers of multiple drive coils 6 may be provided in the Z direction. Therefore, in this case, coil groups 6A and 6B are preferably staggered in the Z direction. This allows for a substantially continuous moving magnetic field to be generated in the axial directions Y and X. Like the variants of FIGS. 1a and 1b, the arrangement of multiple drive coils 6 according to FIG. 2 allows for a two-dimensional movement trajectory of multiple transport units 3 in the transport plane TE, here having coordinates in the X and Y directions. Rotation of multiple transport units 3 around an axis perpendicular to the transport plane TEi (here around the Z axis) is also possible.

[0042] 3a and 3b show another configuration of one transport section TSi. In this case, instead of the drive coils 6, a plurality of movable permanent magnets PM are provided in one or more transport sections TSi. FIG. 3a shows a front view of this transport section TSi. Here, a portion of the top surface (facing the transport units 3 during operation) is shown in cross section. FIG. 3b shows a side view of this transport section TSi. The permanent magnets PM can be controlled by a control device 5 to generate a time-varying (moving) magnetic field. As a result, the permanent magnets PM are moved in a defined manner. FIG. 3a shows an example of the arrangement of the movable permanent magnets PM in this transport section TSi. Here, the permanent magnets PM are cylindrical and each have one north and one south magnetic pole, as indicated by the hatched surfaces.

[0043] Here, mobility is achieved by each of the permanent magnets PM being rotatable about a rotation axis RA, as indicated by the arrows in FIGS. 3a and 3b. Here, each of the rotation axes RA coincides with the cylindrical axis of the permanent magnet PM. The rotation axes RA extend perpendicular to the conveying plane TE, i.e., in the Z direction. In the illustrated example, one drive device AE, e.g., one electric motor, is assigned to each permanent magnet PM to drive it. However, this configuration is merely exemplary, and each group of permanent magnets PM may be controlled by one drive device AE. To rotate the permanent magnets PM as desired, a current / voltage can be supplied to the drive device AE by the control device 5. To exert driving and buoyant forces on the conveying units 3, the permanent magnets PM are rotated in a time-shifted manner to generate a time-varying magnetic field, i.e., a moving magnetic field, in a predetermined direction, which cooperates with the magnetic fields generated by the drive magnets 4 of the conveying units 3. However, this configuration can be understood as merely exemplary, and multiple permanent magnets PM may also be provided with other axes of rotation, for example the X-axis or the Y-axis. In general, these mobile permanent magnets PM may be distributed over the entire conveying section TSi or may be arranged over only a part of the conveying section TSi, for example if the drive / levitation forces do not need to be generated at every point of the conveying surface TE.

[0044] FIG. 4a shows a side view of one transport unit 3. FIG. 4b shows this transport unit 3 with the drive magnets 4 viewed from below. FIG. 4c shows another arrangement of the drive magnets 4. The transport unit 3 has a base 9 with an approximately square bottom. The drive magnets 4 are arranged in a known manner on the underside of the stator 2, which faces the transport surface TE during operation. For example, an article to be transported can be arranged on the opposite surface of the base 9. Basically, the arrangement of the drive magnets 4 can be classified into so-called one-dimensional arrangements (FIG. 4b) and two-dimensional arrangements (FIG. 4c). Like the drive coils 6 in the transport sections TSi, the drive magnets 4 are also divided into magnet groups 4A, 4B. A predetermined number of drive magnets 4 are provided for each magnet group 4A, 4B. In this case, the drive magnets 4 with different magnetic poles or magnetization directions alternate, as shown by the hatched and unhatched drive magnets 4 in FIG. 4b. The plurality of drive magnets 4 of one magnet group 4A are oriented in a direction that is geometrically different from the plurality of drive magnets 4 of each of the other magnet groups 4B.

[0045] A known Halbach array, in which the magnetization directions of adjacent drive magnets 4 are rotated by 90° relative to each other, has also proven to be useful. However, in general, the magnetization directions of adjacent drive magnets 4 in the magnet groups 4A and 4B may be rotated by other angles. The Halbach array has the advantage that the magnetic flux on one side (particularly the side facing the conveying surface TE) is greater than on the opposite side. A particularly useful sinusoidal magnetic field can be formed when the outermost drive magnets 4 of one magnet group 4A and 4B have a width narrower than the width of the drive magnets 4 between them, particularly when they have a width half that width.

[0046] In the example shown in FIG. 4b, the drive magnets 4 of adjacent magnet groups 4A and 4B are arranged at 90° angles to each other. The magnet groups 4B may be arranged, for example, to move the transport unit 3 in the Y direction. To this end, these magnet groups 4B may cooperate with the drive coils 6y in the configuration shown in FIGS. 1a and 1b or the coil groups 6B in the configuration shown in FIG. 2. Similarly, the magnet groups 4A may be arranged to move the transport unit 3 in the X direction. To this end, these magnet groups 4A may cooperate with the drive coils 6x in the configuration shown in FIGS. 1a and 1b or the coil groups 6A in the configuration shown in FIG. 2. However, when the transport unit 3 is rotated by 90°, the magnet groups 4B may cooperate with the drive coils 6x or the coil groups 6A for movement in the X direction, and the magnet groups 4A may cooperate with the drive coils 6y or the coil groups 6B for movement in the Y direction.

[0047] In the two-dimensional arrangement (FIG. 4c), the individual drive magnets 4 with different magnetic poles or magnetization directions are arranged in a checkerboard pattern, as indicated by the different hatching. However, the illustrated one-dimensional and two-dimensional arrangements are, of course, merely exemplary, and it is clear that a wide variety of one-dimensional and two-dimensional arrangements are actually possible. The square shape of the base 9 of the illustrated transport unit 3 is also merely exemplary, and other shapes are also possible. For example, a transport unit 3 having a base 9 with a circular bottom surface may also be provided. In this case, the drive magnets 4 may be arranged in a ring shape. In this case, the magnet groups 4A and 4B are also staggered in the circumferential direction.

[0048] It should be noted that the embodiment of the conveying device 1 shown in FIGS. 1a to 4c is illustrative and should not be construed as limiting. As mentioned above, the conveying device 1 may have, in particular, an essentially opposite configuration, which is also naturally encompassed by the present invention. This configuration means, for example, that a time-varying magnetic field can be generated in the conveying unit 3 and a time-invariant magnetic field can be generated in the conveying section TSi of the stator 2. For this purpose, the drive coil 6 or the movable permanent magnet PM can be provided in the conveying unit 3, and the drive magnet 4 can be arranged in the conveying section TSi of the stator 2. The drive coil 6 or the movable permanent magnet PM is then appropriately controlled to move the conveying unit 3. For this purpose, a separate control device can be provided for each of the conveying units 3. The control devices and the drive coils 6 or the movable permanent magnets can be supplied with energy, for example, by a suitable energy supply.

[0049] FIG. 5 is a schematic front view of two transport units 3A and 3B viewed from above. Here, these transport units 3A and 3B are identically configured and each include a base body 9 with a substantially square bottom. A coupling device 11 is provided on each of the four sides of these transport units 3A and 3B. Here, these coupling devices 11 are fully mechanically configured and are manufactured so that all six degrees of freedom of relative movement between the transport units 3A and 3B connected to the transport unit group TV (see FIG. 1a) are limited or locked. That is, these transport units 3A and 3B can be coupled to each other substantially rigidly. Therefore, the resulting transport unit group TV behaves as if it were a single transport unit of twice the size. Here, these coupling devices 11 each include a coupling element 11a and a receiving portion 11b, spaced apart from each other by a predetermined distance on each side of the base body 9. Naturally, more or fewer connecting elements 11a and receiving portions 11b may be provided depending on how rigid the connection has to be and how many degrees of freedom of movement have to be restricted.

[0050] Here, the connecting element 11a is configured as a cylindrical bolt, and a corresponding cylindrical connecting opening 15 is provided as a receiving portion 11b. Here, as a locking device, a clamping element 13 pressed by a pressure element 14 is provided in the connecting opening 15, and a clamping opening 12 is provided in the connecting element 11a. The clamping element 13 engages in the corresponding clamping opening 12 for locking. This configuration is, of course, merely exemplary, and many other known locking devices can be provided. Here, the locking device can be passively operated by the relative movement of the transport units 3A, 3B. Here, the pressure element 14 is configured as a spring and presses the clamping element 13 in the direction of the axis of the cylindrical connecting opening 15. In the illustrated example, one clamping opening 12 is provided in each connecting element 11a as a circumferential groove. Naturally, multiple clamping openings 12 of different shapes may be provided, or multiple clamping openings 12 of different shapes may be provided, or multiple clamping openings 12 of different shapes may be provided. Here, the clamping elements 13 are configured, for example, as facing spheres. Naturally, the opposite variation is also possible: one or more clamping elements 13 may be provided on the connecting element 11a, and one or more clamping openings 12 may be provided in the connecting opening 15. A hybrid version is also conceivable in which the clamping openings 12 and the clamping elements 13 are provided on the connecting element 11a and also in the connecting opening 15.

[0051] To couple two transport units 3A, 3B, these transport units 3A, 3B can be moved relative to one another in the transport plane TE so that the coupling element 11a of one transport unit 3A fits into the corresponding coupling opening 15 of the other transport unit 3B. In this case, in the illustrated example, the clamping element 13 is pressed radially outward from the coupling element 11a against the pressing force of the pressing element 14. Upon reaching the corresponding position, the clamping element 13, here a ball, engages in a groove around the clamping opening 12 (here, the ball and the groove together form a locking device). This completes the coupling process and simultaneously completes the locking. The two transport units 3A, 3B are then directly coupled to one another as a transport unit group TV. The translational degree of freedom in the X direction is at least locked by the corresponding clamping element 13 and the clamping opening 12 (which together constitute the locking device) until an opposite force (e.g., a drive force or an inertial force) acts on the clamping element 13 in the X direction with a certain release force. The locking device can be released, for example, by exerting a sufficiently large opposite force on the transport units 3A, 3B, for example by generating a drive force, in order to pull the clamping element 13 away from the clamping opening 12 again against the pressing force of the pressing element 14.

[0052] However, suitable operating units (not shown in FIG. 5) may be provided on the transport units 3A, 3B, for example, to operate the locking devices for the locking and / or decoupling. However, it is of course not necessary to form the transport unit group TV by moving the transport units 3A, 3B while the transport apparatus 1 is in operation. For example, the transport units 3A, 3B may be coupled to the transport unit group TV outside the transport apparatus 1, for example manually by a person, and then placed on the transport surface TE of the stator 2. Naturally, the same can be done during the decoupling. However, in order to enable the transport apparatus 1 to carry out its processes as flexibly as possible, it is advantageous if the coupling / decoupling can be performed automatically during operation.

[0053] As shown diagrammatically in FIG. 6, a known bayonet connection may be provided as the locking device. In this case, an L-shaped clamping opening 12 is provided in the receiving portion 11b of the coupling device 11, and a radially protruding clamping element 13 is provided on the corresponding coupling element 11a. To couple the coupling device 11, a relative axial movement of the transport units 3A, 3B is first required, as indicated by the straight arrow. After coupling, the coupling device 11 can be locked by the locking device by a relative rotation of the coupling element 11a and the receiving portion 11b, as indicated by the curved arrow. In this case, it is irrelevant whether only the coupling element 11a, only the receiving portion 11b, or both are rotated. To operate the locking device, for example, a suitable operating device may be provided on at least one of the two transport units 3A, 3B. Additionally or alternatively, a suitable pressure element (not shown) may be provided for or to assist this operation. However, the coupling and locking of the two transport units 3A, 3B can also be achieved by a bayonet connection by sequentially performing relative movements between the transport units 3A, 3B, e.g., by first performing a relative rotational movement about the X-axis or Y-axis of at least one transport unit 3A, 3B relative to the other transport unit 3A, 3B before coupling, so that the clamping elements 13 are aligned with the clamping openings 12. To this end, a relative translational movement (e.g., in the X-direction) of the transport units 3A, 3B is performed so that the clamping elements 13 are inserted into the axial portion of the L-shaped clamping openings 12. Finally, a relative rotational movement back to the initial position is performed when the clamping elements 13 abut against the circumferentially extending portion of the L-shaped clamping openings 12. By performing the process in reverse, the locking device is released and the coupling device 11 is separated. This allows for a simple and energy-free locking and engagement. This prevents the transport unit group TV from being undesirably separated even when a relatively large force acts in the axial direction.

[0054] As mentioned above, one or more actuators (not shown) may be arranged on one or more transport units 3. For example, an electric actuator may be provided as an operating device to operate the locking device. This may reduce the force required for the coupling process, for example, compared to the purely mechanical coupling device 11 shown in FIG. 5. In this case, energy may be supplied to the actuator(s) by an energy store, for example a battery, arranged on the respective transport unit 3. However, it is also conceivable to transfer energy from the stator 2 to the actuator(s) inductively. This may eliminate the need for a separate energy store.

[0055] However, for example, one of the magnet groups 4A, 4B of one transport unit 3 may be used as an actuator for operating the operating device. For example, at least one of the magnet groups 4A, 4B (or an additional magnet group not shown) may be arranged on the transport unit 3 so as to be movable relative to the other magnet groups. For example, one magnet group may be linearly movable or rotatable relative to the other magnet groups. In this case, the movable magnet group is appropriately connected to the operating device to perform the movement required to operate the respective locking device and generate the required operating force and / or operating moment. As a result, by appropriately controlling the multiple drive coils 6, the movable magnet group and the other (fixed) magnet groups can be moved relative to each other. The operating device can be operated by this relative movement. However, instead of or in addition to operating the locking device, the one or more actuators may fulfill further functions. For example, a handling device (not shown) for the items to be transported may be provided on the transport unit 3. For example, a clamping jig for fixing the item to the conveying unit 3, and / or a rotation device for rotating the item relative to the conveying unit 3, and / or a lifting device for raising and lowering the item, etc. may be provided as handling equipment.

[0056] In this case, the handling device can likewise be driven by one or more actuators. Thus, the adaptability of the transport apparatus 1 can be further improved. For example, an article can be transferred from one transport unit 3 to another transport unit 3 by the handling device. For example, an article can be transferred from a transport unit 3 to a work station provided in the transport apparatus 1 by the handling device. At this work station, a specific work step of the manufacturing process, such as cleaning, assembling, or processing of the article, is performed. However, for example, the article can also be moved from a transfer position to a work position in the work station by the handling device without being transferred. The article can then be moved as desired within the work station by the transport unit 3 to perform the specific work step.

[0057] FIG. 7 is a top view of two transport units 3A and 3B connected to one transport unit group TV. Each of these transport units 3A and 3B has a base 9. The coupling device 11 of the right transport unit 3A has a receiving portion 11b, and the coupling device 11 of the right transport unit 3B has a coupling element 11a. For example, similarly (as in FIG. 5), the coupling element 11a can be configured as a cylindrical bolt, and the receiving portion 11b can be configured as a corresponding cylindrical coupling opening 15. Here, a tightening element 13 is also provided in the coupling opening 15 as a locking device, and a tightening opening 12 that cooperates with the tightening element 13 is provided in the coupling element 11a. In this case, the tightening element 13 engages in the corresponding tightening opening 12 to lock the coupling device 11.

[0058] Here, the transport units 3A, 3B can be coupled by relative movement, as in the example according to FIG. 5. Here, the coupling device 11 is secured in the coupled state by relative movement by engaging the clamping elements 13 into the corresponding clamping openings 12. Here, an external operating device is provided to unlock the locking device. As shown, the external operating device can be arranged on a fixed structure 22 of the transport device 1. In this case, the fixed structure 22 can be, for example, part of the transport section TSi. However, the external operating device can also be arranged on a third transport unit (not shown). In this embodiment, an operating opening 19 is provided on the left transport unit 3A. The operating opening 19 connects the connecting opening 15 to the side of the base body 9 of the transport unit 3A. An inclined first operating surface 18a is provided at the free end of the coupling element 11a. The first operating surface 18a is inclined at a specific angle about a vertical axis (here, the Z axis) and faces the operating opening 19 in the coupled state. Here, the operating device comprises a cylindrical operating rod 21. The operating rod 21 can be inserted into an operating opening 19 of the left transport unit 3A in order to cooperate with an operating surface 18 of the connecting element 11a of the right transport unit 3B to release the locking device. For this purpose, a second operating surface 18b, inclined complementarily to the first operating surface 18a, can be provided at the free end of the operating rod 21. The second operating surface 18b facilitates the release process.

[0059] To release the locking device, the transport unit group TV can be moved relative to the operating device in the transport plane TE so that the operating rod 21 is aligned with the operating opening 19. To this end, the transport unit group TV can be moved toward the operating device (here, in the Y direction) so that the operating rod 21 presses against the first operating surface 18 of the connecting element 11a. This causes the clamping element 13 to be pressed against the force of the pressing element 14 and out of the clamping opening 12 of the connecting element 11a that cooperates with the pressing element 14. This releases the locking device, and the transport units 3A, 3B can be separated from the transport unit group TV. Naturally, the locking device can also be released manually by operating the first operating surface 18a of the connecting element 11a, for example, with a suitable tool through the operating opening 19.

[0060] In order to absorb forces acting during processes in the work station, for example external forces acting during the work process, it may be particularly advantageous to couple several transport units 3 into one transport unit group TV. For this purpose, for example, the transport unit group TV may first be configured with a certain number (at least two) of transport units 3, for example outside the work station (for example, in the transport plane TE or manually). The transport unit group TV in the transport plane TE may then be moved into the area of ​​the work station. A specific work process is performed in the area of ​​the work station, and forces occurring during the work process act on the transport unit group TV. After the work process is completed, the transport unit group TV may be removed from the area of ​​the work station and separated again into individual transport units 3. If the transport unit group TV is configured with more than two transport units 3, naturally, only one (or only a few) of the transport units 3 may be separated, and the remaining transport units 3 may be moved again as a smaller transport unit group TV. By configuring one transport unit group TV in the area of ​​a work station, larger forces acting during the work process can be absorbed, since more drive magnets 4 are used than in the case of just one transport unit.

[0061] A further advantage of a transport unit group TV is that a greater acceleration can be achieved compared to an individual transport unit 3, because a greater number of drive magnets 4, which can simultaneously cooperate with a greater number of drive coils 6, are used to accelerate the transport unit group TV. Furthermore, since the transport unit group TV has larger geometric dimensions compared to an individual transport unit 3, it can better resist the rotational moment (acceleration moment) resulting from the acceleration process. The acceleration moment is generated, in particular, by the distance in the Z direction between the center of gravity of the transport unit group TV and the drive magnets 4. A drive force acts on the drive magnets 4 of the transport unit group TV, and so-called control torques can be generated via the drive coils 6 that cooperate with the drive magnets 4 of the transport unit group TV, which are spaced apart from the center of gravity of the transport unit group TV in the X and / or Y directions (depending on the direction of movement), thereby at least partially canceling out the drive force.

[0062] A further advantage of coupled transport units TV, compared to uncoupled transport units TV, is that forces and moments in the coupled state are always transmitted through the coupling device 11 and not through the transported object. This results in additional loads being applied to the object. Naturally, the embodiments already described with reference to FIGS. 5 to 7 are merely exemplary, and alternative designs are possible. Those skilled in the art can select suitable coupling devices 11, locking devices, or operating devices from these alternative designs depending on the desired application. Naturally, the same applies to the embodiment according to FIGS. 8 to 11, which will be described in more detail below. Although the illustrated coupling devices 11 are provided on the side of the transport unit 3, this configuration should not be construed as limiting. Alternatively or additionally, suitable coupling devices 11 may be provided on the surface of the transport unit 3, e.g., on the upper and / or lower surface of the transport unit 3 facing the drive magnet 4. Furthermore, the coupling devices 11 may have magnetic elements for coupling only or to assist coupling. The main other embodiments will be described below with reference to FIGS.

[0063] The upper part of FIG. 8 shows two transport units 3A and 3B. A coupling device 11 is disposed on each of these transport units 3A and 3B. The coupled transport units 3A and 3B are shown below as a transport unit group TV. The coupling element 11a of the transport unit 3B has at least one coupling element 11a. The coupling element 11a is disposed on the upper surface of the base body 9 facing the drive magnet 4 and protrudes from the left side surface of the base body 9. Naturally, this configuration is merely exemplary, and multiple coupling elements 11a may be provided. The coupling element 11a may be configured in any manner, such as a cylindrical bolt, a rod with a rectangular cross section, or the like. Here, the coupling device 11 of another transport unit 3A has at least one receiving portion 11b, which is also disposed on the upper surface of the base body 9. The connecting element 11a and the receiving portion 11b may be coupled to the respective transport units 3A, 3B in any manner, for example, glued or screwed, or may be integrated into the base body 9 of the transport units 3A, 3B. To connect the transport units 3A, 3B to the transport unit group TV, the receiving portion 11b is provided to receive the connecting element 11a of one of the transport units 3B. For this purpose, for example, one connecting opening 15 may be provided. The connecting element 11a can be inserted into this connecting opening 15, particularly by relative movement of the two transport units 3A, 3B. Here, once the connecting element 11a and the connecting opening 15 are aligned, only movement in the X direction is required for the connection. In the illustrated example, the connecting element 11a is configured as a cylindrical bolt, as shown by the hatched cross section in FIG. 8 , and the connecting opening 15 is correspondingly configured as a cylindrical hole extending in the X direction in the receiving portion 11b.

[0064] Within the transport unit group TV, the relative movement between these transport units 3A, 3B is limited by the coupling to at least one degree of freedom of movement, here in the Y direction. However, the cylindrical configuration of the coupling element 11a and the coupling opening 15 may also allow a certain relative rotational movement about a common coupling axis KA, which here extends in the X direction. Naturally, here too, a suitable locking device (not shown) may be provided to lock the coupling element 11a in the receiving section 11b in a locking or pressure-locking manner. For example, the combination of one or more clamping elements 13 with one or more pressure elements 14 and one or more corresponding clamping openings 12 shown in FIG. 5 may be provided as a locking device. Naturally, active locking devices having actuators as operating devices are also conceivable. Naturally, here too, as indicated by dashed lines, several coupling devices 11 may be provided for each transport unit 3A, 3B. In this case, naturally, each connecting device 11 may have several connecting elements 11a and / or several receiving portions 11b.

[0065] FIG. 9 shows another configuration of multiple interlocking devices 11. The upper part shows two separated transport units 3A, 3B, while the lower part shows these transport units 3A, 3B coupled to a transport unit group TV. Here, at least one coupling opening 15 is provided directly in the base body 9 of the transport unit 3A as a receiving portion 11b. Similarly, at least one coupling element 11a corresponding to the at least one receiving portion 11b is arranged on the upper surface of the base body 9 of each other transport unit 3B. The shape of the coupling opening 15 can be formed in almost any way. In particular, the shape of the coupling opening 15 is selected depending on the desired degree of freedom of movement of these transport units 3A, 3B coupled to the transport unit group TV.

[0066] In the illustrated example, the coupling opening 15 is configured as a cylindrical hole extending vertically (in the Z direction) into part of the base body 9. A cylindrical protrusion 16 extending partly vertically downwards is provided on the underside of the coupling element 11a. While, for example, in the configurations according to FIGS. 5 and 7a, only one movement (in the X and Y directions) in the conveying plane TE is required, the embodiment according to FIG. 9 also requires a relative movement of the conveying units 3A, 3B in a vertical axis perpendicular to the conveying plane TE of the stator 2. For example, the conveying unit 3A can be lowered in the Z direction relative to the conveying unit 3B (and / or the conveying unit 3B can be raised relative to the conveying unit 3A). This lowering and / or raising can be performed by controlling the corresponding drive coils 6 using the planar motor control device 5.

[0067] This control reduces the gap between the drive magnet 4 and the stator 2 of the transport unit 3A and / or increases the gap between the drive magnet 4 and the stator 2 of the transport unit 3B. To complete the coupling, the transport units are moved (in the X and Y directions) within the transport plane TE to align the coupling opening 15 of the accommodation portion 11b of the transport unit 3A with the protrusion 16 of the coupling element 11a of the transport unit 3B. After this, the transport unit 3A can be raised again in the Z direction and / or the transport unit 3B can be lowered. In a similar manner, rotations about the X, Y, and Z axes can also be used for coupling or decoupling. In the illustrated example, two translational degrees of freedom (X, Y) of the transport units 3A and 3B are completely restricted, and only a third translational degree of freedom (Z) is partially restricted. Furthermore, depending on the structure of the coupling device 11 and the shape of these transport units 3A, 3B, two degrees of freedom of rotational movement (about the X and Y axes) are completely restricted, and at least a portion of the degree of freedom of rotational movement about the Z axis is restricted.

[0068] However, depending on the shape of the transport units 3A, 3B, a specific relative movement of the transport units 3A, 3B about the vertical connecting axis KA can be achieved, for example, by providing one or more of the transport units 3A, 3B with a base body 9 having a circular base or by providing a specific distance between the two connected base bodies 9 (which of course also applies to all other embodiments). However, if, as shown in FIG. 9, the base bodies 9 each have a rectangular base and the transport units 3A, 3B are directly adjacent to each other in the connected state, the degree of freedom of rotational movement about the Z axis (here, the connecting axis KA) is also limited. Naturally, in the embodiment according to FIG. 9 as well, multiple coupling devices 11 can be provided for each transport unit 3A, 3B, and / or one coupling device 11 can have multiple receptacles 11b and / or coupling elements 11a.

[0069] FIG. 10 shows another embodiment of a plurality of interlocking coupling devices 11. The upper part of the figure similarly shows two separated transport units 3A, 3B, while the lower part shows these transport units 3A, 3B combined into a transport unit group TV. Here, a coupling opening 15 is provided directly in the base body 9 of the transport unit 3A as a receiving portion 11b. Similarly, one coupling element 11a corresponding to at least one receiving portion 11b for this coupling is arranged on the side of the base body 9 of each other transport unit 3B. The coupling opening 15 may be configured, for example, as a cylindrical hole or may have another shape, for example, a groove with a rectangular cross section. The coupling element 11a may be configured to cooperate with the coupling opening 15.

[0070] As a locking device for locking the additional degree of movement (here in the X direction), at least one clamping opening 12 is provided in the connecting element 11a, and at least one clamping element 13, which cooperates with the clamping opening 12 to lock the connecting device 11, is provided in the connecting opening 15. The clamping element 13 is arranged slidably in the Z direction in the opening provided for this locking, as indicated by the double arrow. Naturally, several clamping elements 13 and several clamping openings 12 may be provided. In this embodiment, the locking device is operated by gravity for the locking, and the operation for releasing the locking device is performed magnetically. For this purpose, an external operating device BE is provided. The operating device BE can be arranged, for example, on a fixed structure 22 of the transport device 1, for example on the transport section TSi. The operating device BE has a first operating magnet 23a, which can be configured as a permanent magnet or an electromagnet. A second operating magnet 23b, in particular a permanent magnet, is arranged on the clamping element 13, which can cooperate with the first operating magnet 23a to generate a magnetic force in a vertical direction towards the clamping element 13, which raises the clamping element 13.

[0071] To lock the locking device, the transport unit 3A on which the tightening element 13 is mounted can be moved relative to the fixed operating device BE, for example, as shown, so that the tightening element 13 is located in the area below the operating device BE. The operating magnets 23a and 23b cooperate to vertically raise the tightening element 13 and hold it in this raised position. The transport unit 3B on which the tightening element 13 is mounted can then be moved relative to the other transport units 3A, so that the transport units 3A, 3B are connected to one transport unit group TV by the cooperation of the connecting elements 11a with the corresponding connecting openings 15. The connecting openings 15 are in a connected state below the raised tightening element 13. In this position, the transport units 3A, 3B or the group of transport units TV can be moved, for example, simultaneously in one direction (e.g., the X or Y direction) to move the second actuation magnet 23b of the clamping element 13 away from the magnetic field of the (fixed) first actuation magnet 23a. When sufficient magnetic force no longer acts downward on the clamping element 13, the clamping element 13 drops into the clamping opening 12 and the coupling device 11 is locked. Optionally, a pressing element can be arranged vertically between the clamping element 13 of the transport unit 3A and the base 9 to accelerate or assist the locking. However, the pressing force must be selected so that the magnetic force is always greater than the pressing force.

[0072] However, if the first operating magnet 23a of the operating device BE is configured as an electromagnet, the transport unit group TV can, for example, remain in the area of ​​the operating device BE and the electromagnet can be deactivated. This causes the magnetic force FM acting on the tightening element 13 to disappear. As a result, to lock the coupling device 11, the tightening element 13 descends vertically into the tightening opening 12 by gravity (and possibly an additional pressing force). To unlock the locking device, a fundamentally opposite process can be performed by moving the transport unit group TV into the area of ​​the operating device BE to raise the tightening element 13. At this time, the transport unit 3B, on which the coupling element 11a is arranged, can be moved relative to the respective other transport unit 3A so as to move away from the transport unit 3A.

[0073] However, the locking operation of the locking device can be performed essentially without an external magnetic field FM. For example, a plurality of appropriately cooperating inclined contact surfaces may be provided on the tightening element 13 and / or the connecting element 11a. For example, a suitable first inclined surface 24a facing the opening surface of the connecting opening 15 may be arranged on the tightening element 13. A corresponding second inclined surface 24b may be provided on the free end of the connecting element 11a. This allows the locking device to be locked solely by the relative movement of the two transport units 3A, 3B. A force in the X direction may be generated by the relative movement in the X direction. This force acts on the tightening element 13 by the connecting element 11a. A lifting force acting perpendicularly on the tightening element may be generated by the cooperating inclined surfaces 24a, 24b. This lifting force may raise the tightening element 13 to the height of the circumferential surface of the connecting element 11a and engage into the tightening opening 12. Here, no bevel is provided on the side of the clamping element 13 facing the inner end of the connecting opening 15. The release of the locking device can therefore be carried out again, for example, by means of an external operating device BE and a magnetic field FM.

[0074] 11a to 11c illustrate another configuration of the present invention. FIG. 11a shows two transport units 3A and 3B as viewed from above. Similarly, as described above, each of the transport units 3A and 3B includes a base 9 having a rectangular bottom. A plurality of coupling devices 11 are provided on the four sides of each of the transport units 3A and 3B. Here, the coupling devices 11 include a plurality of magnet elements 17a and 17b having different magnetization directions. To couple the transport units 3A and 3B, the transport units 3A and 3B are moved relative to each other until the gap between the magnet elements 17a and 17b becomes small enough so that the magnet elements 17a and 17b cooperate with each other. The magnet elements 17a and 17b then generate mutually oriented attractive forces. This allows the transport units 3A and 3B to be coupled into a single transport unit group TV solely by magnetism. In this case, the connection is therefore essentially effected exclusively by magnetic force in a pressure-fit manner or by friction forces dependent on the magnetic force.

[0075] FIG. 11b shows a possible transport unit group TV. Since the cooperating coupling devices 11 are each provided with only one magnet element 17a, 17b, transport unit groups TV with a specific offset (here, in the Y direction) of the transport units 3A, 3B are also possible. In this case, a substantially continuous relative positioning in the Y direction is possible. This allows, for example, coupling by a third transport unit 3C, as shown by the dashed line. To separate the transport unit groups TV again, for example, an opposite driving force (here, in the X direction) exceeding the magnetic attractive force can be generated by the stator 2. However, separation is also possible by a shear movement, whereby the transport units 3A, 3B are moved tangentially in the opposite direction (here, in the Y direction).

[0076] 11c shows another example of a group of transport units TV consisting of two magnetically coupled transport units 3A, 3B. Here, the coupling devices 11 of these transport units 3A, 3B each include a plurality of juxtaposed magnet elements 17a, 17b with different magnetization directions. To achieve this coupling, each magnet element 17a of the coupling device 11 of one transport unit 3A cooperates with a plurality of magnet elements 17b of the coupling device 11 of the other transport unit 3B to generate a magnetic attractive force (here, in the X direction). Thus, two opposing identically magnetized magnet elements 17a, 17b repel each other, while two opposing differently magnetized magnet elements 17a, 17b attract each other, thereby achieving a certain degree of fixation of these transport units 3A, 3B to each other in a predetermined relative position.

[0077] In the illustrated example, four magnet elements 17a, 17b are arranged alternately in each of the coupling devices 11 of the transport units 3A, 3B. In the transport unit group TV, all four magnet elements 17a, 17b of the coupling device 11 of the left transport unit 3A cooperate with all four magnet elements 17a, 17b of the coupling device 11 of the right transport unit 3B. However, offset couplings are also possible, as in the transport unit group TV according to FIG. 11b. However, unlike the variant with only one magnet element 17a, 17b per coupling device 11 (FIGS. 11a+11b), the offset between the two transport units 3A, 3B (here in the Y direction) can be adjusted in a stepless manner.

[0078] Here, the offset mainly depends on the number, arrangement, and width of the magnet elements 17a, 17b. In the transport unit group TV shown in FIG. 11c, an offset of two magnet widths b, for example, upward or downward, is possible. However, in this case, only the two magnet elements 17a, 17b of the left transport unit 3A cooperate with the two magnet elements 17b, 17a of the right transport unit, while the other magnet elements 17a, 17b are free. Naturally, these other magnet elements 17a, 17b can also be used to couple to a third transport unit (not shown), for example. From this configuration, it can be seen that a wide variety of magnetic coupling devices 11 can be realized. In this embodiment, too, a shearing motion can preferably be performed to separate the transport unit group TV.

[0079] Naturally, the coupling device 11 may also be a combination of mechanical and magnetic coupling. For example, in the case of a mechanical coupling device 11, it is conceivable that additional magnetic elements are provided to assist the coupling process. To achieve magnetic guidance, for example, the coupling element 11a and the receiving part 11b can be magnetized in different directions, which allows for easier coupling. In the embodiment according to FIG. 9, for example, the area of ​​the coupling opening 15 on the transport unit 3A and the protrusion 16 of the coupling element 11a on the transport unit 3B can be magnetized in different directions. No specific diagrams of this configuration are attached.

[0080] As mentioned above, more than two transport units 3 may naturally be coupled by a plurality of coupling devices 11 to obtain larger transport unit groups TV as shown in Figures 12a to 12f. In Figures 12a to 12f, a plurality of transport units are coupled to one transport unit group TV. In this case, these coupling devices 11 are shown only schematically and can be configured almost arbitrarily. As mentioned above, for example, a fully mechanical configuration or a fully magnetic configuration is conceivable, or even a hybrid version is conceivable. In this case, as mentioned above, the transmission of forces between these transport units 3 is likewise performed via a corresponding plurality of coupling devices 11, respectively.

[0081] FIG. 12a shows two transport units 3A and 3B connected to one transport unit group TV by multiple connecting devices 11, as already shown in FIG. 1a. However, since multiple connecting devices 11 are provided on all four sides of these transport units 3A and 3B, connection to other sides is naturally possible. FIG. 12b shows four transport units 3A-3D with square bottoms connected to one transport unit group TV. As a result, a single large, square transport unit is obtained. This allows, for example, a relatively large item O that would otherwise extend beyond the X and Y directions of an individual transport unit 3A-3D to be transported, as shown in FIG. 12. However, this transport unit group TV can also be useful when a relatively heavy item O must be transported that exceeds the maximum load capacity of one (or more) of the transport units 3A-3D. For example, by using only the multiple drive magnets 4 of one of the four transport units 3A to 3D to cooperate with the multiple drive coils 6 of the stator 2, the transport unit group TV can be moved within the transport plane TE (not shown).

[0082] If a larger driving force is required, naturally, multiple or all of the drive magnets 4 of all of the transport units 3A-3D of the transport unit group TV may be used. For example, in the example shown in FIG. 12b, multiple drive coils 6 assigned to multiple drive magnets adjacent to each other in the center of the transport unit group TV may be used to generate the driving force. However, for efficient operation, it is preferable to use all available drive coils 6. FIG. 12d shows another possibility of connecting four transport units 3A-3D into one T-shaped transport unit group TV. FIGS. 12c and 12f show two variations of one transport unit group TV having three connected transport units 3A-3C.

[0083] The transport unit group TV in FIG. 12c may be useful for transporting an item O with a non-uniform mass distribution, as illustrated by an item O with an eccentric center of gravity S. Here, two transport units 3A and 3C may be coupled to the transport unit 3B to support the transport unit 3B, so as to better counteract the moment arising from the eccentric center of gravity S. FIG. 12f illustrates a relatively small item O with a relatively large mass. Given the geometric dimensions of the item O, the central transport unit 3B is sufficient. However, for example, the mass of the item O may exceed the maximum load capacity of the transport unit 3B (or require unacceptably large power to control the multiple drive coils 6). Therefore, the support of two additional transport units 3A and 3B within the illustrated transport unit group TV may be useful. For completeness, FIG. 12e also illustrates a transport unit group TV with six transport units 3A-3F. This transport unit group TV may be used, for example, to transport an elongated item O. From these configurations, it is clear that many other sizes and shapes of a transport unit group TV can be easily formed, in which case the specific configuration of the transport unit group TV can be changed depending on the field of application.

[0084] FIG. 13 shows a conveying device 1 used in a bottle filling plant for transporting bottles 25 between individual work stations ASi in a filling process. It should be understood that the conveying device 1 is merely an example for explaining the present invention based on a preferred field of application. Naturally, the conveying device 1 can also be used for any other conveying process. A plurality of adjacent conveying sections TS1-TS7 are provided in the conveying device 1. These conveying sections together form a conveying plane TE. The conveying device 1 includes three conveying units 3A-3C, which are movable at least two-dimensionally in the X and Y directions within the conveying plane TE. Two opposing coupling devices 11 are arranged on each of the conveying units 3A-3C. As mentioned above, the coupling devices 11 can be configured in almost any way, for example, fully mechanically, fully magnetically, or a combination thereof. A locking device may be provided to lock the coupling devices 11 in their coupled state.

[0085] A control device may be provided in the transport device to control the movement of the transport units 3A-3C. For example, a number of suitable section control devices may be assigned to each transport section TSi. In this case, these section control devices may communicate with a higher-level control device of the transport units to change the control instructions. In turn, the control device of the transport device may be connected to a system control device of, for example, a filling system, in order to continuously synchronize the movement process of these transport units 3A-3C. As will be explained below, these transport units 3A-3C are shown at various stages of the transport process.

[0086] In a first step, the first transport unit 3A in the first transport section TS1 is moved from the start area SB into the working area of ​​the first workstation AS1. Here, workstation AS1 is configured as a fixed transfer station for transferring empty bottles 25L to the transport unit 3A. The empty bottles can be moved, for example, from a collection station (not shown) to a transfer position UB of the transfer station and transferred to the transport unit 3A at this position by a suitable handling device. However, the specific configuration of the transfer station is not important; it can be configured, for example, as a known industrial robot, a long-stator linear motor-type transport unit, or an endless conveyor. In the illustrated example, the transfer station is arranged in the Z direction above the transport plane TE so that the empty bottles 25L in the transfer position UB can be lowered onto the transport unit 3A from above in a second step S2. Here, empty bottles 25L are delivered one by one, but naturally, if the load capacity of the transport unit 3A allows for the loading of multiple bottles 25L, multiple bottles 25L may be delivered.

[0087] In the third step, the first transport unit 3A, carrying one empty bottle 25L, moves into the connecting area KB toward the adjacent second transport section TS2. This movement process is naturally advantageously performed to avoid unacceptably high accelerations that could cause the bottle 25L to tip over. In the fourth step, the first transport unit 3A is connected to the second transport unit 3B and the third transport unit 3C within the connecting area KB to form a single transport unit group TV. This connection can be performed, for example, while the first transport unit 3A is stopped, but it can also be performed while the three transport units 3A-3C are moving by continuously synchronizing their movement processes. This connection does not have to be performed simultaneously; first, the second transport unit 3B or the third transport unit 3C can be connected to the first transport unit 3A, and then the other transport units 3B and 3C can be connected, respectively. By connecting the transport units to a single transport unit group TV, a greater electromagnetic force can be applied to the transport unit group TV than in the case of individual transport units 3. This is because a larger number of drive magnets 4 can be driven and therefore these drive magnets 4 can cooperate with a larger number of drive coils 6 of the planar motor.

[0088] In the fifth step S5, the transport unit group TV is moved into the working area of ​​the second work station AS2. This movement can be performed by controlling the drive coils 6 of the second transport section TS2 to cooperate with the drive magnets 4 of all or some of the transport units 3A-3C. Here, the second work station AS2 is configured as a fixed filling station. In this filling station, empty bottles 25L transported by the transport unit group TV are filled with liquid in the area of ​​the filling position FP, as indicated by the hatching, during the sixth step S6. Here, the filling station is also arranged above the transport plane TE. Of course, it is also conceivable in principle for the filling station or, together, the work stations ASi to be configured as movable so that the work process can be performed while the transport unit group TV or one of the transport units 3 is moving. For example, in the illustrated example, the filling station can be moved in the X direction at the same speed as the transport unit group TV so that the filling process can be performed while the transport unit group TV is moving.

[0089] Filling the empty bottles 25L increases the mass, i.e., the weight acting on the transport unit group TV, which is the sum of the weight of the transport unit group TV itself and the weight of all the bottles 25V. However, this transport unit group TV generates a greater gravitational force in the Z direction than would be the case for an individual transport unit 3A. Therefore, the weight of all the bottles 25V may be greater than, for example, the maximum load capacity of an individual transport unit 3A because additional gravitational forces may be generated by the connected transport units 3B and 3C. Naturally, other or additional process forces may act on the transport unit group TV. In general, these process forces should be understood as the additional load of the transport unit group TV and therefore not just its weight, but as other forces or moments acting on the transport unit group TV during the work process. Furthermore, this transport unit group TV may generate a greater driving force in the X or Y direction than would be the case for an individual transport unit 3A. Therefore, for example, greater accelerations may be achieved, resulting in more dynamic processes.

[0090] In a seventh step, the transport unit group TV with all the bottles 25V transported by the transport unit group TV is moved into the unloading area EB in the third transport section TS3. In the unloading area EB, all the bottles 25V are grasped by a suitable handling device 26, for example, an industrial robot, and unloaded from the transport unit group TV in an eighth step S8. This unloading ends the transport process, and the load of all the bottles 25V is removed, so that the transport unit group TV can be separated again. Therefore, the individual transport units 3A-3C can be moved again, for example, to their predetermined start positions. For example, while the subsequent transport and filling processes are already being carried out, the first transport unit 3A can be moved back into the start area SB in the first transport section TS1. For this purpose, for example, another transport section TS8 can be provided, as indicated by the dashed line. As shown by the arrow and the dashed line of the transport unit 3B, the second transport unit 3B can be moved back into the connecting area KB via, for example, the fourth and fifth transport sections TS4 and TS5 so as to be connected to the following first transport unit 3A. Similarly, the third transport unit 3C can be moved back into the connecting area KB via, for example, the sixth and seventh transport sections TS6 and TS7.

[0091] The handling device 26 can transfer all bottles 25V removed from the transport unit group TV to, for example, another transport device 27. By means of the transport device 27, all bottles 25V can be transferred, for example, into a collection area or to a subsequent processing station, for example a stoppering station, where all bottles 25V are stoppered. Naturally, the transport device 27 can also be configured as the transport device 1 of the present invention, or as a long-stator linear motor type transport device, an endless conveyor, an industrial robot, etc.

[0092] The second variant of the present invention will now be described in detail with reference to FIGS. 14a to 17b. According to this variant, a transport unit 3A can be coupled to an article carrier OT (as a coupling unit 50). The basic structure and function of the transport device remain unchanged, and therefore no further explanation will be provided in this regard. The structure of the transport device corresponds, for example, to the structure shown in FIGS. 1a and 1b. FIG. 14a shows a side view of the transport unit 3A and the article carrier OT. FIG. 14b shows a front view of the transport unit 3A (without the article carrier OT) viewed from above. The section AA in FIG. 14a corresponds to the section line in FIG. 14b. An arbitrary article O can be placed on the article carrier OT. The article can be moved by the transport unit 3A in a transport plane TE (shown only diagrammatically) of the transport device. As already explained in detail with reference to FIGS. 4a to 4c, the transport unit 3A can have, for example, a base 9 on whose underside a plurality of drive magnets 4 are arranged. At least one coupling device 11 is provided on the transport unit 3A and on the article carrier OT, respectively. By relative movement between the transport unit 3A and the article carrier OT, the transport unit 3A can be coupled to the article carrier OT to form an article carrier group OV. After coupling, the article carrier group OV can be moved in a conventional manner within the transport plane TE by controlling the drive coils or movable permanent magnets of the stators. For easier recognition, in Fig. 14a the article carrier OT and the transport unit 3A are shown in an uncoupled state.

[0093] Within the scope of the present invention, relative movement can be understood as movement of the transport unit 3A relative to the stationary article carrier OT, or movement of the article carrier OT relative to the stationary transport unit 3A, or movement of the transport unit 3A and the article carrier OT relative to each other. The mobility of the transport unit 3A depends primarily on the configuration of the transport device 1, in particular on the arrangement of the drive magnets 4 in the transport unit 3A and on the arrangement of the drive coils or movable permanent magnets in the stator. In general, movement in the transport plane TE can be understood as movement in at least two and up to six degrees of freedom of movement. In the illustrated example, the transport unit 3A can be translated almost unrestrictedly in the XY plane and only limitedly in the Z direction. Almost unrestricted rotational movement is possible about the Z axis, and limited rotational movement is possible about the X and Y axes.

[0094] For example, the article carrier OT can be releasably held in a fixed holder (not shown) of the transport device 1. The holder can be positioned in a suitable position that can be reached by the transport unit 3A. First, the transport unit 3A can be moved in the transport plane TE towards the article carrier OT. When the transport unit 3A is in the area of ​​the article carrier OT, the coupling device 11 of the transport unit 3A can be matched with the coupling device 11 of the article carrier OT. The transport unit 3A can then be coupled to the article carrier OT solely by a relative movement. In this case, the article carrier OT is detached from the holder. The article carriers OV can then be moved in the transport plane TE by appropriately controlling the transport unit 3A in order to carry out the desired transport procedure. Naturally, the opposite variation is also possible. In this variation, the transport unit 3A remains stationary and the article carrier OT is moved relative to the transport unit 3A by a suitable handling device, for example a robot. In this case, however, the coupling procedure remains unchanged.

[0095] In the example according to Figures 14a and 14b, the coupling device 11 of the article carrier OT has a coupling element 11a, and the coupling device 11 of the transport unit 3A has a receiving part 11b corresponding to said coupling element 11a. Here, the coupling element 11a is arranged on the underside of the article carrier OT facing the transport unit 3A and has a web 28 adjacent to said underside and a free end 29 that is wider relative to said web 28. Here, the free end 29 has, for example, a rectangular cross section. However, the free end 29 and / or the web 28 may also, for example, each be configured cylindrically. In this case, the web 28 has a smaller diameter than the free end 29. The wider free end 29 can be considered part of a locking device within the meaning of the present invention, in particular as a clamping element.

[0096] The receiving compartment 11b is arranged on the surface of the base body 9 of the transport unit 3A facing the drive magnets 4. Here, the receiving compartment 11b has a receiving opening 30 with a rectangular cross section. The receiving opening 30 extends from this surface over a portion of the base body 9 in the direction of the underside. Naturally, however, the receiving opening 30 may also have another shape, for example a circular cross section. Adjacent to one side of the receiving opening 30 are a guide channel 31 that opens upward (here, extends approximately in a Z-shape) and a receiving channel 32 that lies below the guide channel 31 in the Z direction. The guide channel 31 and the receiving channel 32 can be considered part of a locking device within the meaning of the present invention, in particular as a clamping opening. In this case, the width of the guide channel 31 corresponds approximately to or slightly exceeds the width of the web 28 of the connecting element 11a of the article carrier OT, and the width of the receiving channel 32 corresponds approximately to or slightly exceeds the width of the free end 29 of the connecting element 11a of the article carrier OT.

[0097] By a relative movement between the article carrier OT and the transport unit 3A, the article carrier OT and the transport unit 3A can be coupled to form an article carrier group OV. For this, the article carrier OT and the transport unit 3A are first positioned relative to each other in the XY plane so that the coupling element 11a and the receiving section 11b are aligned. A relative movement in the Z direction is then carried out until the coupling element 11a is received in the receiving section 11b, thereby completing coupling within the meaning of the present invention. In the case of coupling, at least one degree of freedom of the relative movement between the article carrier OT and the transport unit 3A is limited (here, two translational degrees of freedom in the X and Y directions and a rotational degree of freedom about the Z axis). Here, the locking device can likewise be operated by the relative movement (here, firstly in the X direction) so that the web 28 of the coupling element 11a is received in the guide channel 31 and the free end 29 of the coupling element 11a is received in the receiving channel 32. This limits another degree of freedom of the relative movement (here in the Z direction). Further relative movements can then be carried out that depend substantially on the route of the guide path 31 and the parallel receiving path 32. In the example shown, this relative movement thus constitutes a Z-shaped progression consisting of the above-mentioned relative movement in the X direction, followed by a relative movement in the Y direction and a further relative movement in the X direction, until the web reaches the area of ​​the closed end of the guide path 31.

[0098] However, it should be understood that the illustrated embodiment of the configuration is merely exemplary, and that these components may be configured differently. For example, the coupling element 11a and the receiving portion 11b may have different shapes, and the guide path 31 and the receiving path 32 may have different routes. Naturally, the coupling device 11 of the article carrier OT may have multiple coupling elements 11a of the same type, and the coupling device 11 of the transport unit 3A may have multiple receiving portions 11b of the same type. For example, additional magnetic elements (not shown) may be provided to assist the coupling process. For example, the coupling element 11a and the receiving portion 11b may be magnetized in different directions to achieve magnetic guidance that allows for easier coupling. For example, one magnetic element that magnetically cooperates with the coupling element 11a may be provided only in the end region of the receiving path 32 to generate a holding force.

[0099] The example according to Figures 15a and 15b differs from the configuration according to Figures 14a and 14b only by the configuration of the connecting element 11a and the corresponding receiving part 11b. Here, the connecting element 11a is likewise arranged on the underside of the article carrier OT facing the transport unit 3A and has a cylindrical projection 33 adjacent to this underside and a radially projecting pivot shaft 34 arranged on its circumferential surface. This pivot shaft 34 can, for example, also be cylindrical. The pivot shaft 34 is spaced apart in the Z direction from at least the underside of the article carrier OT. Here, the pivot shaft 34 is arranged approximately in the center of the projection 33 in the Z direction, but it can also be located further below. The pivot shaft 34 can be considered part of a locking device within the meaning of the present invention, in particular a clamping element. Here, the receiving part 11b has a cylindrical receiving opening 35 extending from its upper surface over part of the base body 9 toward its underside. The diameter of this receiving opening 35 approximately corresponds to or is slightly larger than the diameter of the cylindrical projection 33. A vertical slit 36 ​​extending radially outward in the Y direction when viewed from above is provided on the side of the receiving opening 35. When viewed in the Z direction, the vertical slit 36 ​​extends from the start of the upper surface of the base body 9 over a portion of the depth of the receiving opening 35. In this case, this portion approximately corresponds to the distance from the lower surface of the article carrier OT to the lower surface of the pivot 34. When viewed in the circumferential direction, the slit 36 ​​is connected to a guide channel 37 having an approximately annular sector shape. As can be seen in FIG. 15a, the guide channel 37 is radially connected to the receiving opening 35 and is spaced apart from the upper surface of the base body 9. The guide channel extends circumferentially from the slit 36 ​​over a predetermined angle, here, for example 90°. The slit 36 ​​and the guide channel 37 therefore constitute a locking device, in particular a clamping opening, within the meaning of the present invention.

[0100] Similarly, the article carrier OT and the transport unit 3A can be coupled by their relative positions. To this end, the article carrier OT and the transport unit 3A are first positioned relative to each other in the XY plane so that the coupling element 11a and the receiving section 11b are aligned. In the illustrated example, this means that the cylindrical protrusion 33 is aligned with the receiving opening 35 and the pivot axis 34 is aligned with the slit 36. A relative movement in the Z direction is then performed until the coupling element 11a is received in the receiving section 11b. This completes the coupling, since at least one degree of freedom of the relative movement is restricted (here, two translational degrees of freedom in the X and Y directions are locked, the rotational degree of freedom about the Z axis is locked, and naturally, due to the cylindrical locking, rotation about the X and Y axes is also locked). The locking device can then be activated by a relative rotational movement about the Z axis so that the pivot axis 34 of the coupling element 11a is received in the guide path 37. This limits the further degree of freedom of the relative movement, here in the Z direction. Naturally, the configurational embodiments shown in Figures 15a and 15b can likewise be considered merely exemplary, and naturally, these components can also be configured differently. As already mentioned above with respect to Figures 14a and 14b, magnetic assistance may likewise be provided.

[0101] 16a and 16b show another possible embodiment for coupling the article carrier OT with the transport unit 3A. Here, the coupling device 11 of the article carrier OT has four coupling elements 11a arranged on the underside of the article carrier OT, and the transport unit 3A has four corresponding receiving sections 11b on the upper side of the base 9. Each of the coupling elements 11a has a square protrusion 38, and the receiving sections 11b have square recesses 39. The dimensions of the recesses 39 are approximately equal to or slightly larger than the protrusions 38. In the illustrated example, one receiving opening 38a is provided for each protrusion 38, which can be considered part of a locking device within the meaning of the present invention, in particular a fastening opening. Here, the receiving opening 38a is configured, for example, as a cylindrical through-hole extending in the Y direction. Here, a first locking path 40a and a second locking path 40b are provided in each square recess 39. One end of the first locking path 40a is connected to the square recess 39, and the other end is closed. The first locking path 40a (when connected) extends parallel to the receiving opening 38a of the protrusion 38, in the Y direction. One end of the second locking path 40b is connected to the first locking path 40a, and the other end is closed. The longitudinal axes of the locking path 40a and the locking path 40b intersect and are disposed at a predetermined angle, in this case 90°, to each other. Therefore, the second locking path 40b extends in the X direction. A first locking element 41a is disposed within the first locking path 40a. This first locking element 41a is movable within the first locking path 40a in the direction of the longitudinal axis. Similarly, a second locking element 41b is disposed within the second locking path 40b. This second locking element 41b is movable within the second locking path 40b in the direction of the longitudinal axis. The first locking element 41a can be considered as a tightening element of a locking device in the sense of the present invention.

[0102] Similarly, the article carrier OT and the transport unit 3A can be coupled by relative movement. First, the article carrier OT and the transport unit 3A are positioned relative to each other in the XY plane so that the coupling element 11a and the receiving section 11b are aligned. In the illustrated example, this means that the square protrusion 38 is aligned with the square recess 39. In this case, the first locking element 41a is in particular completely located within the first locking path 40a, as shown in the upper left corner of FIG. 16b as a representative for all four receiving sections 11b. A relative movement in the Z direction is then performed until the protrusion 38 is received in the recess 39. This completes the coupling process within the meaning of the present invention, since at least one degree of freedom of the relative movement is thereby restricted (here, two translational degrees of freedom in the X and Y directions are locked, the rotational degree of freedom about the Z axis is locked, and, due to the locking lock, rotation about the X and Y axes is also locked). Then, the locking device can likewise be activated by the relative movement. In contrast, FIG. 16b shows the locking elements 41a, 41b of the four coupling devices 11 at different time-sequential steps (upper left, upper right, lower left, and lower right) of the locking process. To operate the locking device, the article carrier group OV is first tilted from the horizontal about the X-axis until a portion of the first locking element 41a is received in the receiving opening 38a of the corresponding protrusion 38, as shown in the upper right of FIG. 16b as a representative for all four receptacles 11b. In this case, the locking element may be moved due to gravity, but also or alternatively due to mass inertia forces. This locks the other degree of freedom of the relative movement, here in the Z-direction, in a locked manner. Thereafter, the article carrier group OV is tilted about the Y-axis (and / or after the article carrier group OV has returned to the horizontal) until a portion of the second locking element 41b is received in the first locking path 40a, as shown in the lower left of FIG. 16b as a representative for all four receptacles 11b. The second locking element 41b therefore acts as a protection member for the first locking element 41a, so that the first locking element 41a does not inadvertently move away from the receiving opening 38a.Unlocking can be performed in the reverse order of the movement sequence: first, tilting about the Y axis is performed (bottom right of FIG. 16b) so that the second locking element 41b releases the first locking element 41a, and then tilting about the X axis is performed so that the first locking element 41a releases the receiving opening 38a. Naturally, the configuration embodiments shown in FIGS. 16a and 16b can likewise be understood to be merely exemplary, and naturally, these components can be configured differently. Likewise, magnetic assistance can be provided, as already mentioned above in FIGS. 14a and 14b.

[0103] 17a and 17b show another possible embodiment for coupling the article carrier OT with the transport unit 3A. Here, the coupling device 11 of the article carrier OT has, for example, two coupling elements 11a arranged on the underside of the article carrier OT, and the transport unit 3A has two receiving sections 11b on the upper side of the base body 9, which correspond to the coupling elements 11a. As in the example according to FIG. 16a, the coupling elements 11a each have a square projection 42 with a receiving opening 42a that constitutes part of the locking device, in particular the fastening opening. As in the example according to FIG. 16b, the receiving sections 11b each have a square recess 43. A locking path 44 is provided in each square recess 43. One end of the locking path 44 is connected to the square recess 43, and the other end is, in particular, closed. The locking path 44 extends (in the coupled state) parallel to the receiving opening 42a of the projection 42, here in the Y direction. As shown on the right side of FIG. 17b, a magnetic locking element 46 is arranged in the locking channel 44, is movable in the direction of the longitudinal axis therein, and is pressed by a spring element toward the recess 43. The locking channel 44, the locking element 46, and the spring 45 thus constitute a part of a locking device within the meaning of the present invention. In this case, the locking element 46 may in particular be considered a clamping element within the meaning of the present invention. In the unactuated state, the locking element 46 is in the locked state shown on the right side. In this example, an actuating device BE is required to actuate the locking device, as already explained based on the example of FIG. 10. As shown in FIG. 17b, the actuating device BE may be part of the transport device 1, for example, but may also be part of the transport unit 3A. In the illustrated example, a magnetic actuating element 47, e.g., a permanent magnet or an electromagnet, is provided on the actuating device BE. The actuating device BE may also be configured differently, for example, by mechanical actuation.

[0104] To couple the article carrier OT to the transport unit 3A, first the transport unit 3A can be moved into the manipulation area of ​​the handling device BE. A magnetic force FM is generated in the manipulation area towards the locking element 46. The locking element 46 is moved by the magnetic force FM from a locked position (on the right side of FIG. 17b) to an unlocked position (on the left side of FIG. 17b). The article carrier can then be coupled to the transport unit 3A by a relative movement. In this case, the article carrier OT and the transport unit 3A are positioned relative to each other in the XY plane so that the coupling element 11a and the receiving portion 11b are aligned. In the illustrated example, this positioning means that the square protrusion 42 is aligned with the square recess 43. A relative movement in the Z direction is then performed until the protrusion 42 is received in the recess 43. This completes the coupling process in the sense of the present invention, since at least one degree of freedom of said relative movement is restricted (here the two translational degrees of freedom in the X and Y directions are locked, the rotational degree of freedom about the Z axis is locked, and naturally also the rotation about the X and Y axes due to the locking fixation).

[0105] The locking device can then be operated by moving the article carrier group OV out of the operating area of ​​the handling device. Since the magnetic force FM disappears, the locking element 46 is again moved by the elastic element 45 into the locked state (right side in FIG. 17b). The locking element 46 is now accommodated in the accommodation opening 42a. This restricts another degree of freedom of relative movement, now in the Z direction, in a locking manner. Unlocking can be performed in the reverse order of the movement sequence: first, the handling device BE is moved into the operating area, and then the article carrier OT is separated from the transport unit 3A. Naturally, the configurational embodiments shown in FIGS. 17a and 17b are likewise merely exemplary; these components can naturally be configured differently and any number of coupling elements 11a and accommodations 11b may be provided. 10, corresponding ramps (not shown) may of course be arranged on the locking element 46 and on the protrusion 42, so that the locking element 46 can be transferred from the locked state to the unlocked state by relative movement during the coupling process. In this case, the actuation by the operating device BE is only necessary for the unlocking.

[0106] It is clear that highly adaptable transport processes can be performed by the transport device 1 according to the invention, and that any article can be transported very flexibly during the transport process. By coupling a plurality of transport units 3A into one transport unit group TV according to the first variant of the invention, so that the transport process can be performed according to a desired movement sequence, the transport process can be advantageously adapted to the size and weight of the articles to be transported. The coupling of the transport units 3 and the article carriers OT according to the second variant of the invention has the advantage that the coupling / detachment of the transport units 3 and the article carriers OT can be more easily performed. This results in, for example, easier and faster exchange of various article carriers OT. [Explanation of symbols]

[0107] 1. Conveyor device 2 Stator 3,3A,3B,3C,3D,3E,3F Transport unit 4 Drive magnet 4A,4B magnet group 5 Planar motor control device, control device 6,6x,6y drive coil 6A, 6B coil group 9 Base 11 Coupling device 11a Connecting element 11b Storage section 12 Fastening opening 13 Fastening element 14 Pressing element 15 Connection opening 16 Cylindrical protrusion 17a, 17b magnet elements 18 Inclined operation surface 18a Inclined first operation surface 18b Inclined second operating surface 19 Operation opening 21 Operating rod 22 Fixed structures 23a 1st operation magnet 23b 2nd operation magnet 24a, 24b Slopes 25 jars 26 Operating device 27 Another transport device 28 Web 29 Free end 30 Storage opening 31 Guidance Route 32 Containment Route 33 Protrusion 34 Swivel axis 35 Storage opening 36 Slit 37 Guidance Route 38 Protrusion 38a Storage opening 39 Recess 40a, 40b Lock path 41a, 41b Locking elements 42 Protrusion 42a Storage opening 43 Recess 44 Lock Paths 45 Springs and Elastic Elements 46 Rock Elements 47 Control section 50 Connecting Unit OT Goods Carrier O Goods OV Goods Carrier Group TV transport units FM magnetic force AE drive unit BE operating device X, Y, Z axes RA rotation axis KA connecting shaft TE,TEi conveying surface TSi transport section AS-i Work Station SB start area 25L empty bottle 25V filled bottle UB delivery position KB consolidated area FP filling position EB Unloading Area BPB movement trajectory PM Movable permanent magnet, permanent magnet S center of gravity b Magnet width S1~S9 1st step~9th step

Claims

1. A transport unit (3) for a transport device (1) as a planar motor having at least one transport section (TSi) constituting one transport surface (TE), The transport unit (3) includes at least a transport unit (3A), In a transport unit (3), a plurality of drive magnets (4) are provided in the transport unit (3A) for magnetically cooperating with a plurality of drive coils (6) or a plurality of movable permanent magnets (PM) of the transport section (TSi) so as to move the transport unit (3A) at least in two dimensions in the transport plane (TE), or a plurality of drive coils (6) or a plurality of movable permanent magnets (PM) are provided in the transport unit (3A) for cooperating with a plurality of drive magnets (4) of the transport section (TSi), At least one coupling device (11) is provided on the transport unit (3A), and the coupling device (11) is configured to releasably couple the transport unit (3A) to one coupling unit (50) to form a group of transport units by relative movement between the transport unit (3A) and one coupling unit (50) in the transport plane (TE), the coupling device (11) is configured as a locking and / or pressure-locking device and / or at least one magnetic element (17a, 17b) is provided in the coupling device (11), the coupling device (11) is configured to cooperate with the coupling unit (50) in the group of coupled transport units to limit at least one degree of freedom of relative movement between the transport unit (3A) and the coupling unit (50); The connecting unit (50) is another transport unit (3B), and at least two of the transport units (3A, 3B) can be connected to one transport unit group (TV) by the connecting device (11), and these transport units (3A, 3B) in the transport unit group (TV) can move together in the transport plane (TE), or the connecting unit (50) is an article carrier (OT) for accommodating articles (O), and the transport unit (3A) can be connected to the article carrier (OT) to form one article carrier group (OV), and this article carrier (OT) in this article carrier group (OV) can be moved in the transport plane (TE) by the transport unit (3A).

2. The coupling device (11) forms at least part of a locking device, The transport unit (3) according to claim 1, characterized in that the locking device is configured to limit one separate degree of freedom of relative movement between the connected transport unit (3A) and the connecting unit (50).

3. the locking device is operable by a relative movement between the transport unit (3A) and the connecting unit (50) or by a separate operating device (BE); or The transport unit (3) according to claim 2, characterized in that an operating device (BE) for operating the locking device and an actuator for operating this operating device (BE) are provided in the transport unit (3A) or the connection unit.

4. At least one connecting element (11a) and / or at least one receiving portion (11b) are provided in the connecting device (11), The transport unit (3) according to any one of claims 1 to 3, characterized in that the connecting element (11a) is arranged to cooperate with a receiving portion (11b) of the connecting unit (50) for said connection.

5. At least one connecting element (11a) and / or at least one receiving portion (11b) are provided in the connecting device (11), the connecting element (11a) is arranged to cooperate with a receiving portion (11b) of the connecting unit (50) for said connection, 3. The transport unit (3) according to claim 2, characterized in that at least one fastening opening (12) and / or at least one fastening element (13) is provided in at least one connecting element (11a) and / or at least one receiving portion (11b), in particular as part of the locking device.

6. A conveying device (1) as a planar motor having a conveying unit (3) according to any one of claims 1 to 5, The conveying device has at least one conveying section (TSi) constituting one conveying surface (TE) and at least one conveying unit (3A) movable at least two-dimensionally within the conveying surface (TE), A plurality of drive coils (6) or a plurality of movable permanent magnets (PM) are arranged in the transport section (TSi) and a plurality of drive magnets (4) are arranged in the transport unit (3A), or a plurality of drive coils (6) or a plurality of movable permanent magnets (PM) are arranged in the transport unit (3A) and a plurality of drive magnets (4) are arranged in the transport section (TSi), In the transport device (1), the plurality of drive coils (6) or the plurality of movable permanent magnets (PM) magnetically cooperate with the plurality of drive magnets (4) to move the transport unit (3A) at least two-dimensionally within the transport plane (TE), At least one coupling unit (50) is provided on the conveying device (1), and at least one coupling device (11) is arranged on the at least one coupling unit (50) for releasably coupling the conveying unit (3A) to the coupling unit (50), The transport unit (3A) and the connecting unit (50) can be at least temporarily connected to one transport unit group using a plurality of the connecting devices (11) by relative movement within the transport plane (TE); and The conveying device (1) is characterized in that the coupling devices (11) in the coupled group of conveying units cooperate to limit at least one degree of freedom of relative movement between the conveying unit (3A) and the coupling unit (50), and the at least one coupling unit (50) is another conveying unit (3B), and the at least two conveying units (3A, 3B) can be coupled to one conveying unit group (TV) by the coupling devices (11), and these conveying units (3A, 3B) in the conveying unit group (TV) can move together in the conveying plane (TE), or the at least one coupling unit (50) is an article carrier (OT) for accommodating an article (O), and the conveying unit (3A) can be coupled to the article carrier (OT) to form one article carrier group (OV), and this article carrier (OT) in this article carrier group (OV) can be moved in the conveying plane (TE) by the conveying unit (3A).

7. the plurality of coupling devices (11) are configured as locking and / or pressure-locking devices, and / or The conveying device (1) according to claim 6, characterized in that each of the plurality of coupling devices (11) forms at least part of one locking device, and the locking device is configured to limit one further degree of freedom of relative movement between the coupled conveying unit (3A) and the coupling unit (50).

8. the locking device can be operated by relative movement between the transport unit (3A) and the connecting unit (50), or an operating device (BE) is provided in the transport device (1) for operating the locking device; 8. The conveying device (1) according to claim 7, characterized in that the operating device (BE) is configured in particular as a fixed, in particular mechanical or magnetic, operating device (BE) and / or that an operating device (BE) for operating the locking device and an actuator for operating this operating device (BE) are provided on the conveying unit (3A) or on the connecting unit (50).

9. At least one connecting element (11a) is provided in the connecting device (11) of the transport unit (3A) and at least one receiving section (11b) is provided in the connecting device (11) of the connecting unit (50), or at least one connecting element (11a) is provided in the connecting device (11) of the connecting unit (50) and at least one receiving section (11b) is provided in the connecting device (11) of the transport unit (3A), the coupling element (11a) is arranged to cooperate with the receiving portion (11b) for releasably coupling the transport unit (3A) to the coupling unit (50), In particular, the locking device comprises at least one clamping element (13) and at least one clamping opening (12) cooperating with said clamping element (13), 9. The conveying device (1) according to claim 7 or 8, characterized in that the clamping element (13) is arranged on the connecting element (11a) and the clamping opening (12) is arranged in the receiving portion (11b), or the clamping element (13) is arranged in the receiving portion (11b) and the clamping opening (12) is arranged on the connecting element (11a).

10. Each of the plurality of coupling devices (11) has at least one magnet element (17a, 17b); The conveying device (1) according to any one of claims 6 to 9, characterized in that the magnet elements (17a, 17b) are arranged to generate a magnetic attraction between the conveying unit (3A) and the connecting unit (50).

11. A method for operating a conveying device (1) according to any one of claims 7 to 9, comprising: At least one transport unit (3A) is moved relative to the connecting unit (50) in the transport plane (TE), or the connecting unit (50) is moved relative to the at least one transport unit (3A) in the transport plane (TE), The transport unit (3A) and the connecting unit (50) are connected to each other by the relative movement using a plurality of connecting devices (11) to form a single transport unit; In particular, the method is characterized in that the locking device is operated in the coupled state.

12. One other transport unit (3B) is used as a connecting unit (50), A plurality of the transport units (3A, 3B) are connected to form one transport unit group (TV), 12. The method according to claim 11, wherein the group of transport units (TV) is moved in the transport plane (TE) by at least some of the drive magnets (4) of one of the at least two transport units (3A, 3B) magnetically cooperating with drive coils (6) or movable drive magnets (PM) of the transport section (TSi), or by at least some of the drive coils (6) or movable drive magnets (PM) of one of the at least two transport units (3A, 3B) magnetically cooperating with drive magnets (4) of the transport section (TSi).

13. the transport units (TV) are moved into a work station where a work process is performed, in which a process force acts on the transport units (TV) and / or at least one article is loaded onto the transport units (TV); 13. The method according to claim 12, wherein the group of transport units (TV) is separated into at least two of the transport units (3A, 3B) after the work process is completed.

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