Device for the orderly stacking of plate-shaped objects and associated system

Abstract

A device for the orderly stacking of plate-shaped objects, comprising: a support platform on which several plate-shaped objects can be stacked; a fixed alignment stop wall arranged on one side of the support platform so that the several plate-shaped objects can abut the alignment stop wall; a first displacement module configured to cause the support platform to oscillate back and forth in a first axial direction; a second displacement module configured to cause the support platform to oscillate back and forth in a second axial direction, wherein the first axial direction is different from the second axial direction;and at least one movable alignment limiting plate arranged on one side of the support platform where no alignment stop wall is provided, wherein the alignment limiting plate is moved stepwise into an approximately upright position during the reciprocating oscillating movements of the first displacement module and the second displacement module in order to limit and thereby align the plate-shaped objects on at least one other side of the support platform.

Description

Field of invention The present invention relates to a device for the orderly stacking of plate-shaped objects and an associated system, in which an orderly stacking of the plate-shaped objects is achieved by reciprocating oscillating movements along different axis directions and by a stepwise approach of a movable boundary plate. State of the art Manufacturing processes involving stacking are used in many areas; for example, in the production of printed circuit boards (PCBs) or in modularization through the stacking of battery cells. In PCB manufacturing, layered plates with metallic conductor patterns are stacked on top of each other to achieve a high-density, three-dimensional conductor structure. In battery modularization, on the other hand, multiple battery cells are stacked on top of each other and electrically connected, which can significantly increase the energy density of a modularized single-battery system. Conventional stacking techniques typically employ automated optical inspection (AOI) or other positioning devices to ensure accuracy during the stacking process. However, these systems are expensive, require significant installation space for the positioning equipment, and have relatively long alignment times. In addition, physical or structural positioning methods are also used, employing clamping devices or other auxiliary equipment to improve positioning accuracy. Most commonly, positioning pins are used that interact with positioning holes provided in the products, allowing the pins to be guided through these holes, thus enabling proper stacking of the products while simultaneously increasing alignment accuracy. However, these devices are expensive, and most are not universally applicable. Furthermore, a specific positioning device must be developed for each product, even for each individual plate-shaped object. Therefore, the development costs of the associated equipment are considerable. Since electronic products undergo a very rapid generational change, development of the next product generation often has to begin before the development costs of the existing equipment have even been recouped, thus keeping the associated costs permanently high. In view of the aforementioned shortcomings of the prior art, the present invention provides a novel device for the orderly stacking of plate-shaped objects and an associated system to effectively solve the aforementioned problems. Object of the invention The main object of the present invention is to provide a device for the orderly stacking of plate-shaped objects and an associated system in which stacked plate-shaped objects are aligned in an orderly manner by a reciprocating oscillating motion in different axial directions as well as by an approach and limiting movement of movable alignment limit plates. This not only eliminates the need for complex positioning and calibration devices such as automatic optical inspection systems, but also reduces development costs and the size of the device. The present invention provides a device for the orderly stacking of plate-shaped objects, comprising a support platform, a fixed alignment stop wall, a first displacement module, a second displacement module, and at least one movable alignment limiting plate, wherein the alignment stop wall and the alignment limiting plate are arranged on one side of the support platform, and the plate-shaped objects are arranged on the support platform and abut the alignment stop wall, wherein the first displacement module and the second displacement module are each configured to cause the support platform to oscillate back and forth in a first axial direction and a second axial direction, respectively, wherein the first axial direction is different from the second axial direction.The reciprocating oscillation in different axial directions, as well as the gradual approach movement of the alignment limiting plate in the vertical direction, aligns the several plate-shaped objects stacked on the support platform in such a way that an orderly stacking is achieved. To better understand the tasks, technical content, features and advantageous effects of the present invention, the specific embodiments are described in detail below. Brief description of the drawings Fig. 1 shows a schematic view of the device according to the invention for the orderly stacking of plate-shaped objects; Fig. 2 shows a schematic view of the device according to the invention for the orderly stacking of plate-shaped objects in the state of use; Figs. 3A and 3B show schematic views of a state of the device according to the invention for the orderly stacking of plate-shaped objects in which plate-shaped objects are inserted and stacked; Figs. 4A and 4B show schematic views of a state of the device according to the invention for the orderly stacking of plate-shaped objects in which plate-shaped objects are aligned and stacked properly; Fig. 5 shows a schematic view of the system according to the invention for orderly stacking, which is formed using the device for the orderly stacking of plate-shaped objects. Detailed description of the exemplary implementations To better understand the advantages, nature, and features of the present invention, exemplary embodiments are described in detail below with reference to the figures. It should be noted that these exemplary embodiments are only representative examples of the present invention and are not intended to limit the implementation and the claims of the present invention to these exemplary embodiments. The purpose of providing these exemplary embodiments is solely to make the disclosure of the present invention more comprehensive and easier to understand. The terminology used herein serves only to describe particular embodiments and is not intended to limit the general concept of the invention. As used herein, the singular forms "a / an" etc. and "the" etc. are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as they would be generally understood by a person skilled in the art in the field to which the embodiments belong.It is further understood that terms defined in commonly used dictionaries should be interpreted with a meaning consistent with their meaning in the context of the relevant technology and not interpreted in an idealized or overly formal sense, unless expressly defined as such herein. Reference is made to Fig. 1. The device according to the invention for the orderly stacking of plate-shaped objects comprises a support platform 10, a fixed alignment stop wall 12, a first sliding module 20, a second sliding module 30, and at least one movable alignment limit plate (a first alignment limit plate 41, a second alignment limit plate 42, and a third alignment limit plate 43). The support platform 10 serves to stack several plate-shaped objects 70 on it in order to carry out alignment and orderly stacking. The platform surface of the support platform 10 should be somewhat larger than the dimensions of the plate-shaped objects 70. With regard to its shape, it preferably corresponds to the shape of the plate-shaped objects 70.For example, the plate-shaped objects 70, as shown in the figure, have an essentially rectangular shape, which is why the platform surface of the support platform 10 is also essentially rectangular. Of course, the design is also possible in other embodiments, provided that the support platform 10 is suitable for supporting the plate-shaped objects 70 and ensuring orderly stacking on it. The alignment stop wall 12 is fixedly arranged on one side of the support platform 10. As shown in the figure, the support platform 10 has a first side edge 101, a second side edge 102 opposite the first side edge 101, a third side edge 103 adjacent to the first side edge 101, and a fourth side edge 104, with the alignment stop wall 12 being arranged on the first side edge 101 of the support platform 10. As shown in the figure, the alignment stop wall 12 is also designed in two parts. However, it can also be designed as a single, centrally arranged component or as a construction with several elements, without being limited to this. The first displacement module 20 serves to set the support platform 10 (including the several plate-shaped objects 70 stacked on it) into a reciprocating oscillation along a first axis. The second displacement module 30 serves to set the support platform 10 (including the several plate-shaped objects 70 stacked on it) into a reciprocating oscillation along a second axis. The oscillation amplitude is approximately 5 to 10 mm. The first and second axes are different and must not be parallel to each other; that is, the first and second axes represent two different directions with an included angle to each other.As shown in the figure, the first axis direction runs parallel to the first side edge 101, while the second axis direction runs parallel to the third side edge 103, so that the first and second axis directions are perpendicular to each other. It should be noted that the first and second axis directions are primarily determined according to the plate-shaped objects 70 to be stacked. As shown in the figure, the plate-shaped objects 70 are essentially rectangular. Therefore, the first axis direction is parallel to the first side edge 101 and the second axis direction is parallel to the third side edge 103. When applied to plate-shaped objects of other shapes, the first and second axis directions can be adjusted according to the actual requirements. As shown in the figure, the first sliding module 20 further comprises a first drive 21 and a first sliding platform 22. The first sliding platform 22 serves to position the support platform 10 on it. The reciprocating oscillation along the first axis direction, generated by the first drive 21, drives the first sliding platform 22 such that the support platform 10 positioned on it is set into a reciprocating oscillation along the first axis direction. The second sliding module 30 comprises a second drive 31 and a second sliding platform 32. The second sliding platform 32 serves to position the first sliding platform 22 on it.The reciprocating oscillation generated by the second drive 31 along the second axis drives the second sliding platform 32 such that the first sliding platform 22 and the support platform 10 mounted on it are set into a reciprocating oscillation along the second axis. The first drive 21 and the second drive 31 can be, for example, servo motors, pneumatic cylinders, or other drives. In combination with mechanisms such as crank-connecting rod mechanisms, crankshafts, sliding crank mechanisms, or cam mechanisms, the drive force can be converted into a linear reciprocating motion to set the first sliding platform 22 and the second sliding platform 32 into a linear reciprocating oscillation in one direction.Of course, linear motors can also be used, for example, to directly generate a linear reciprocating motion. Alternatively, the positions of the first sliding platform 22 and the second sliding platform 32 can be interchanged (that is, the first sliding platform 22 carries the second sliding platform 32). Another option is to use a single platform that alternately performs a reciprocating oscillation along the first and second axes, or to use a single drive in combination with a gear or transmission mechanism to generate reciprocating oscillations along two axes. The movable alignment limit plates are movably arranged on the side edges of the support platform 10. As shown in the figure, these are a first alignment limit plate 41 located on the third side edge 103, a second alignment limit plate 42 located on the fourth side edge 104, and a third alignment limit plate 43 located on the second side edge 102. During the orderly stacking of the plate-shaped objects 70 by the reciprocating oscillation, they can move stepwise towards an upright position in order to abut the remaining side edges of the support platform 10, with the exception of the first side edge 101. This limits the displacement of the plate-shaped objects 70, thus achieving orderly stacking of the plate-shaped objects 70 and the purpose of alignment. The corresponding movement sequences are explained in more detail below.Since the third alignment limit plate 43 is located on the feed path of the plate-shaped objects 70 transported and stacked on the support platform 10, the stepwise approach movement of the third alignment limit plate 43 to the support platform 10 proceeds from an angle of 180° relative to the support platform 10 to an angle of approximately 90°, i.e., a substantially perpendicular position to the support platform 10. Since no fixed limiting elements are provided on the side edges where the first alignment limit plate 41 and the second alignment limit plate 42 are located (namely the third side edge 103 and the fourth side edge 104), the stepwise approach movement of the first alignment limit plate 41 and the second alignment limit plate 42 also proceeds from an angle of less than 180° relative to the support platform 10 to an angle of approximately 90° to the support platform 10.The aforementioned gradual approach process means that the movement in question is completed within a period of approximately 3 to 10 seconds. The following describes the practical operation with simultaneous reference to Figures 1 and 2. In practice, the plate-shaped objects 70 can be transported one after the other to the support platform 10 by means of a conveyor platform 71 and stacked thereon. At this point, the third alignment limit plate 43 forms an angle of 180° with the support platform 10. The embodiment of the conveyor platform 71 is not subject to any particular restrictions and can, for example, be a conventional conveyor belt or conveyor rollers. The conveying direction is aligned with the first side edge 101 of the support platform 10, so that the plate-shaped objects 70 bear against the alignment stop wall 12 with one side edge during transport. Reference is made to Fig. 1. To ensure that the plate-shaped objects 70 can be transported sequentially and smoothly onto the support platform 10, a lifting mechanism is additionally provided on the underside of the second transfer platform 32. This lifting mechanism comprises a lifting platform 52, a lifting base 53, and a lifting module 51 arranged between the lifting platform 52 and the lifting base 53. The lifting platform 52 serves to support the second transfer platform 32, as well as the first transfer platform 22 arranged on it, the support platform 10, and other components, with the lifting module 51 arranged below the lifting platform 52 serving to control the height of the support platform 10. Reference is made to Fig. 3A. In the initial state, the height of the platform surface of the support platform 10 is set essentially flush with the conveying platform 71.After a sensor 72 detects that a first plate-shaped object 70 has been conveyed onto the carrier platform 10 and is in contact with the alignment stop wall 12, the lifting module 51 controls the lowering of the lifting platform 52 by approximately the thickness of the plate-shaped object 70. As shown in Fig. 3B, this ensures that a second plate-shaped object 70 is inserted smoothly and without any height difference, thus preventing collisions during the transport and stacking process that could lead to damage or the falling of the plate-shaped objects 70. The process described above is then repeated continuously until all plate-shaped objects 70 are completely stacked. Reference is then made to Figures 1, 4A, and 4B. After the plate-shaped objects 70 have been stacked to a predetermined number, reciprocating oscillatory movements are generated in the first and second axial directions by means of the first displacement module 20 and the second displacement module 30. Since the oscillation amplitude is only approximately 5 to 10 mm, small gaps are created between the plate-shaped objects 70, which are in a disordered stacking state, as a result of these slight reciprocating movements. This makes it more difficult for the individual plate-shaped objects 70 to adhere to one another, and allows them to move more easily and gradually align themselves in an orderly manner.Simultaneously, a third drive 44, located on the first sliding platform 22, drives the first alignment limiting plate 41 and the second alignment limiting plate 42, while a fourth drive 45, also located on the first sliding platform 22, drives the third alignment limiting plate 43. This causes them to be raised step by step until they contact and limit the second side edge 102, the third side edge 103, and the fourth side edge 104 of the plate-shaped objects 70. As they gradually approach an upright position and contract step by step, the displacement range of the plate-shaped objects 70 is increasingly restricted. At the same time, the reciprocating oscillations in the first and second axial directions continue.This process continues until the first alignment limiting plate 41, the second alignment limiting plate 42, and the third alignment limiting plate 43 are completely raised into an upright position, thereby completely limiting the plate-shaped objects 70 and preventing any further movement, thus completing the alignment and orderly stacking of the plate-shaped objects 70. As shown in the figure, the plate-shaped objects 70 are essentially rectangular. Therefore, it is currently (in this case) provided that the first axis direction runs parallel to the line connecting the third side edge 103 and the fourth side edge 104, while the second axis direction runs parallel to the line connecting the first side edge 101 and the second side edge 102. If the device is applied to an embodiment with a larger aspect ratio, i.e., a rectangular shape with a larger aspect ratio, the axis directions can also be provided along the two diagonals of the plate-shaped objects 70. Furthermore, in applications with non-rectangular shapes, for example, those in which part of the side edges is curved or arcuate, or with other regular or irregular geometric or...Non-geometric shapes, the first axis direction and the second axis direction are adapted according to the actual requirements. The essential idea is that reciprocating oscillatory movements along two non-parallel axes, namely the first axis direction and the second axis direction, enable the alignment and orderly stacking of the plate-shaped objects without deviating from the technical concept of the present invention. On the other hand, the number and arrangement of the alignment limit plates and the alignment stop wall 12 can also be adapted to the requirements. For example, only one side (e.g., only the second alignment limit plate 42) can be provided in combination with the alignment stop wall 12, with the support platform 10 being slightly inclined towards this side or a corner during orderly stacking to support the orderly stacking. Alternatively, two sides can be provided with alignment stop walls 12, which are used in combination with one or two alignment limit plates, thereby also achieving the goal of alignment and orderly stacking. Furthermore, the shape and number of the first alignment limit plate 41, the second alignment limit plate 42, and the third alignment limit plate 43 can also vary.As shown in the figure, two plates are provided in each case; however, their number can be adjusted according to the actual shape and design of the plate-shaped objects 70. For example, more alignment limit plates can be provided for plate-shaped objects 70 with a longer side edge. Likewise, their shape can be adapted to the side contour of the plate-shaped objects 70, for example, as an arcuate or curved surface instead of a flat surface. Furthermore, the movable alignment limit plates and the fixed alignment stop walls 12 can also be arranged in corner areas. In the figures, the first alignment limit plate 41 and the second alignment limit plate 42 are driven by the third drive 44, and the third alignment limit plate 43 is driven by the fourth drive 45.However, it is also possible that each alignment limit plate has its own drive or that all alignment limit plates are operated by a single common drive. Furthermore, the reciprocating movement described above in the first axial direction can be achieved by arranging a guide rail running parallel to the first side edge 101 between the underside of the first sliding platform 22 and the top side of the second sliding platform 32, so that the first sliding platform 22 is guided linearly on the second sliding platform 32. In this configuration, the first drive 21 can be arranged on the second sliding platform 32. The reciprocating movement described above in the second axial direction can be achieved by arranging a guide rail running parallel to the third side edge 103 between the underside of the second sliding platform 32 and the top side of the lifting platform 52, so that the second sliding platform 32 is guided linearly on the lifting platform 52.In this configuration, the second drive 31 can be arranged on the lifting platform 52. Reference is made to Fig. 5. To make the process station more flexible during the ordered stacking process, several of the aforementioned devices for the ordered stacking of plate-shaped objects 1 can be combined to form an ordered stacking system. A base 60 is provided on which several of these devices for the ordered stacking of plate-shaped objects 1 are movably arranged. In addition, the conveyor platform 71 is attached to a first position on the base 60. With this arrangement, when one of these devices for the ordered stacking of plate-shaped objects 1 is moved to the first position on the base 60, the conveyor platform 71 transports several plate-shaped objects 70 successively to the support platform 10, where they are stacked.Once the stack reaches a predetermined number, the device loaded with the flat objects for the ordered stacking of flat objects 1 is moved away from the first position, while another device for the ordered stacking of flat objects 1 is moved to the first position. This allows for more flexible operation of the process station and significantly increases the efficiency of the ordered stacking. To further illustrate the above description, consider, for example, that the base 60 is provided with a rail 61, while a sliding assembly 54 can also be provided at the lower end of the lifting base 53, corresponding to this rail 61, so that the lifting base 53 can move on the base 60. For instance, after alignment and orderly stacking are complete, a device for the orderly stacking of plate-shaped objects 1 can leave the conveyor platform 71, i.e., leave the first position, by moving the lifting base 53 on the base 60. The next device for the orderly stacking of plate-shaped objects 1 can also be moved to the first position by the same operating mechanism in order to be brought to the conveyor platform 71 and to carry out the stacking of the plate-shaped objects 70.Naturally, the movement can also occur immediately after stacking is complete, with alignment and orderly stacking taking place only after removal from the conveyor platform 71. Furthermore, the conveying mode of the base 60 is not limited to the linear back-and-forth movement shown in the drawing; it can also include linear conveying or a disc-shaped circular motion. After alignment and orderly stacking, the objects can be immediately fed to subsequent processing. This part can, for example, also be connected directly to the next workstation at the end of the base 60. The further functional sequences of the other devices for the orderly stacking of plate-shaped objects correspond to those described above and are therefore not explained again in detail here. Furthermore, the plate-shaped objects 70 can each be an object with a projection 74. For example, it could be a battery cell with conductive terminal contacts protruding from two opposite ends. As shown in Fig. 1, the first alignment limiting plate 41 and the second alignment limiting plate 42 each comprise two limiting elements 411, 412 and a connecting arm 413 arranged between the two limiting elements 411, 412. The distance between the limiting elements 411, 412 corresponds essentially to the width of the projection 74, so that the limiting elements 411, 412 can abut and limit the neck section 73 of a plate-shaped object 70 located on both sides of the projection 74. In summary, the present invention provides a device for the orderly stacking of plate-shaped objects and an associated system. The device for the orderly stacking of plate-shaped objects primarily comprises a carrier platform and a displacement module, which serves to drive the carrier platform into a reciprocating oscillating motion along at least two axes. A fixed alignment stop wall and at least one movable alignment limit plate are arranged on one side of the carrier platform. When several plate-shaped objects are fed successively and stacked on the carrier platform, the alignment stop wall, which is located perpendicular to the conveying direction, initially aligns the plate-shaped objects.Subsequently, an ordered stacking of the several plate-shaped objects is achieved through the back-and-forth oscillating motion and a gradual approach movement of the alignment limiting plate in a vertical direction. In summary, the present invention provides a device for the orderly stacking of plate-shaped objects and an associated system. The device for the orderly stacking of plate-shaped objects loosens the stacked objects through reciprocating oscillations in two axial directions, thereby achieving orderly stacking based on the principle of manual alignment. By gradually approaching an upright position, the stacked plate-shaped objects are forced to align, order, and stack themselves. This eliminates the need for complex positioning and calibration devices such as automatic optical inspection systems, while simultaneously achieving a simple structure and ease of manufacture, thus reducing development costs.At the same time, the device is not limited to a specific shape or design of the plate-like objects, thus enabling a very wide range of applications. Furthermore, a system is provided that is based on this device for the orderly stacking of plate-like objects and allows for more flexible operation of the corresponding process station for the orderly stacking of the plate-like objects, thereby significantly increasing the efficiency of the orderly stacking process. The foregoing description represents only a preferred embodiment of the invention and is not intended to limit the scope of the claims. All equivalent changes and modifications that can be made by a person skilled in the art in this field according to the description and drawings of the invention are within the scope of protection of the present invention. Reference symbol list 1 Device for the orderly stacking of plate-shaped objects 10 Support platform 101 First side edge 102 Second side edge 103 Third side edge 104 Fourth side edge 12 Alignment stop wall 20 First sliding module 21 First drive 22 First sliding platform 30 Second sliding module 31 Second drive 32 Second sliding platform 41 First alignment limit plate 411, 412 Limit element 413 Connecting arm 42 Second alignment limit plate 43 Third alignment limit plate 44 Third drive 45 Fourth drive 51 Lifting module 52 Lifting platform 53 Lifting base 54 Sliding assembly 60 Base 61 Rail 70 Plate-shaped object 71 Conveyor platform 72 Sensor 73 Neck section 74 Projection

Claims

A device for the orderly stacking of plate-shaped objects, comprising: a support platform on which several plate-shaped objects can be stacked; a fixed alignment stop wall arranged on one side of the support platform so that the several plate-shaped objects can abut the alignment stop wall; a first displacement module configured to cause the support platform to oscillate back and forth in a first axial direction; a second displacement module configured to cause the support platform to oscillate back and forth in a second axial direction, wherein the first axial direction is different from the second axial direction;and at least one movable alignment limiting plate arranged on one side of the support platform where no alignment stop wall is provided, wherein the alignment limiting plate is moved stepwise into an approximately upright position during the reciprocating oscillating movements of the first displacement module and the second displacement module in order to limit and thereby align the plate-shaped objects on at least one other side of the support platform. Device for the orderly stacking of plate-shaped objects according to claim 1, further comprising a conveying platform which is arranged adjacent to the support platform in order to convey the several plate-shaped objects successively to the support platform and stack them there. Device for the orderly stacking of plate-shaped objects according to claim 2, further comprising a lifting module by which the support platform can be moved up and down, so that the several plate-shaped objects are conveyed one after the other onto the support platform without any height offset and stacked there. Device for the orderly stacking of plate-shaped objects according to claim 2, wherein the conveying direction of the conveying platform is perpendicular to the alignment stop wall. Device for the orderly stacking of plate-shaped objects according to claim 1, wherein the amplitude of the reciprocating oscillation of the first displacement module and the second displacement module is 5 to 10 mm. Device for the orderly stacking of plate-shaped objects according to claim 1, wherein the support platform has a first side edge, a second side edge opposite the first side edge, a third side edge adjacent to the first side edge and a fourth side edge, wherein the alignment stop wall is arranged on the first side edge and the first axial direction runs parallel to the connecting line between the third side edge and the fourth side edge. Device for the orderly stacking of plate-shaped objects according to claim 6, in which three alignment limiting plates are provided, each of which is arranged on the second side edge as well as on the third side edge and the fourth side edge. Device for the orderly stacking of plate-shaped objects according to claim 7, in which the angle between the alignment limiting plate arranged on the second side edge and the support platform is gradually reduced from 180° to approximately 90°. Device for the ordered stacking of plate-shaped objects according to claim 1, wherein the first displacement module comprises a first drive and a first displacement platform which serves to support and arrange the carrier platform, wherein the first drive drives the first displacement platform and the carrier platform to a reciprocating oscillating movement in the first axial direction. Device for the ordered stacking of plate-shaped objects according to claim 9, wherein the second displacement module comprises a second drive and a second displacement platform which serves to support and arrange the first displacement platform, wherein the second drive drives the second displacement platform, the first displacement platform and the support platform to a reciprocating oscillating movement in the second axial direction. Device for the orderly stacking of plate-shaped objects according to claim 1, wherein, if a plate-shaped object has a projection, the alignment limiting plate has two limiting elements and a connecting arm located between the limiting elements, such that the distance between the limiting elements corresponds substantially to the width of the projection. A system for orderly stacking, formed using the device for orderly stacking of plate-shaped objects according to claim 1, comprising: at least two devices for orderly stacking of plate-shaped objects; a base on which the devices for orderly stacking of plate-shaped objects are movably arranged; and a conveying platform which is fixedly arranged at a first position of the base; wherein, when one of the devices for orderly stacking of plate-shaped objects is moved to the first position of the base, several plate-shaped objects are successively transported by the conveying platform to the support platform and stacked there, and after the stacking has reached a predetermined number, the device loaded with plate-shaped objects is moved away from the first position, whereupon another device is moved to the first position.

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