An assembly device for a window regulator motor connector

Abstract

The utility model provides a kind of assembling device of window rocker motor connector belongs to automobile accessory technical field.The utility model is placed station and push mechanism by being set on bottom plate, telescopic driver in push mechanism is connected with sliding member power, and push head is installed on sliding member, and simultaneously, between push head and sliding member or between sliding member and telescopic driver, the pressure sensor of monitoring sensor is provided, and simultaneously, in push mechanism, displacement sensor of synchronous motion is also provided, so that when connector is pushed to the insertion cavity of shell by push head, the force of assembly and assembly stroke can be detected by pressure sensor and displacement sensor respectively, if one of two is unqualified preset condition, it is judged that product exists assembly defect, current product quality information is obtained in time, the problem that defective product mixes into qualified product and is not easy to eliminate is avoided, and the quality of factory product is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an assembly device for a window regulator motor connector. Background Technology

[0002] As an electric drive structure in automotive windows or sunroofs, the window motor, when connected to the control circuit, can provide power for opening and closing the windows or sunroof, meeting the needs of electrically operated windows or sunroofs.

[0003] Currently, existing window regulator motors on the market, such as the detachable connector window motor disclosed in patent CN212743730U, include a gear transmission assembly. This assembly comprises a housing and a transmission worm gear. The housing forms a worm gear cavity, a worm shaft cavity, a connecting port, and an insertion cavity. The worm shaft cavity is connected to the worm gear cavity via the connecting port. The transmission worm gear is installed within the worm gear cavity, and the worm is installed in the worm shaft cavity, with its threaded portion meshing with the transmission worm gear through the connecting port. Furthermore, the connector includes a mounting body and a pair of conductive pins. Each conductive pin has a conductive end and a mating end. The connector is detachably inserted into the insertion cavity, and after insertion, the conductive ends of the two conductive pins are electrically connected to the lead-out end, while the mating end can be grounded to an external power source. More specifically, the connector includes four conductive pins, each mounted on the mounting body. One end of each conductive pin is electrically connected to the control component, and the other end forms a free end for electrical connection to an external power source. Furthermore, the four conductive pins and the control component are fixed to the mounting body via injection molding, enabling the connector to be installed and removed from the gear transmission assembly. Simultaneously, the conductive pins of the connector connect the conductive component of the drive assembly to the external power source. Additionally, symmetrical elastic protrusions are provided on both sides of the mounting body, and symmetrical locking windows are provided on the outer wall of the housing. When the connector is inserted into the insertion cavity, the elastic protrusions engage with the locking windows, achieving a stable engagement of the connector on the housing of the gear transmission assembly. Therefore, it can be seen that existing window-sliding motors contain a connector that is assembled later, requiring the conductive pins to be connected after assembly. Furthermore, a locking structure is needed to ensure the connector is stably mounted on the housing. Furthermore, existing assembly fixtures for assembling connectors are typically just manually operated push heads. That is, when installing a connector, a person manually inserts one end of the connector into the opening of the insertion cavity of the housing, and then pushes it inward with the push head to achieve manual assembly. Although this can meet the assembly requirements, in actual assembly, due to the varying force applied by the operator and the risk of force tilting during pushing, it is very easy to cause deformation of the conductive pins when assembling the connector. Moreover, since the conductive pins are not visible from the outside after being located in the insertion cavity, and the operator has poor sensitivity to changes in force, assembly defects are difficult to detect, ultimately leading to poor motor power supply and affecting product quality. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention aims to provide an assembly device for a window motor connector. The device includes a placement station and a pushing mechanism with a pressure sensor that extends and retracts relative to the placement station on a base plate. A positioning plate is located beside the placement station, and a displacement sensor is installed on the pushing mechanism. This allows the pressure sensor and displacement sensor to monitor the magnitude of the insertion force and the insertion stroke when the connector is pushed into the insertion cavity of the housing via the pushing mechanism. An increase in the insertion force or a decrease in the insertion stroke indicates assembly failure, visually revealing assembly defects that are difficult to detect and facilitating the removal of defective products.

[0005] The specific technical solution is as follows: An assembly apparatus for a window regulator motor connector, which pushes one end of the connector into an insertion cavity of a housing, is characterized by including: The base plate has a placement station at one end. The pushing mechanism is set on the base plate. The pushing mechanism includes a telescopic driver, a sliding member and a pusher. The sliding member is slidably set on the base plate. The telescopic driver is installed on the base plate and the driving part of the telescopic driver is connected to the sliding member. The pusher is installed on the side of the sliding member close to the placement station. The monitoring sensors include pressure sensors and displacement sensors. The pressure sensors are installed between the telescopic actuator and the sliding member or between the sliding member and the pusher head. The displacement sensors are installed on one of the drive unit of the telescopic actuator, the sliding member, and the pusher head.

[0006] The assembly device for the aforementioned window retractor motor connector further includes a positioning plate, which is mounted on a base plate and located beside the placement station, and the positioning plate is directly opposite the detection head of the displacement sensor.

[0007] In the assembly device for the aforementioned window retractor motor connector, a positioning plate is mounted on an adjusting frame, the lower end of which is fixedly mounted on a base plate. The adjusting frame has a locking hole, and the positioning plate has an adjusting hole. The adjusting hole is a strip-shaped hole, and an adjusting screw passes through the adjusting hole and connects to the locking hole.

[0008] The assembly device for the aforementioned window retractor motor connector includes a limiting hole on the outer shell that communicates with the insertion cavity, and a pin hole on the connector that mates with the limiting hole. After one end of the connector is assembled and inserted into the insertion cavity and installed in place, the pin hole and the limiting hole are aligned, and a positioning pin is inserted into the limiting hole and the pin hole.

[0009] The assembly device for the aforementioned window retractor motor connector further includes a pin assembly. The pin assembly includes a mounting bracket, a push driver, and a pressure pin. The lower end of the mounting bracket is mounted on a base plate and located beside the placement station. The push driver is arranged vertically downward and mounted on the upper end of the mounting bracket. The pressure pin is mounted on the drive shaft of the push driver. The limiting hole on the housing is located directly below the pressure pin in the vertical direction.

[0010] The assembly device for the aforementioned window retractor motor connector includes a sliding component comprising a guide rail, a slider, a connecting top block, and a connecting plate. The guide rail is mounted on a base plate and arranged parallel to the movement direction of the drive unit of the telescopic actuator. A slider is slidably disposed on the guide rail, and a connecting top block is mounted on the slider. Simultaneously, a push head is mounted on the connecting top block. One end of the connecting plate is connected to the connecting top block, and the other end of the connecting plate is connected to the drive unit of the telescopic actuator.

[0011] In the assembly device for the aforementioned window retractor motor connector, the telescopic actuator is an electric push rod.

[0012] In the aforementioned assembly device for a window retractor motor connector, a displacement sensor is mounted on the drive unit of the telescopic actuator.

[0013] The assembly device for the above-mentioned window retractor motor connector includes a pusher head comprising an outer frame and a pressure head. The outer frame is fixedly installed on the connecting top block and has an inner cavity. One end of the pressure head is inserted into the inner cavity, and the other end of the pressure head is arranged facing the placement station.

[0014] The assembly device for the aforementioned window retractor motor connector includes a protruding limiting block placed on the workstation and located on the side opposite to the push head.

[0015] The positive effects of the above technical solution are: The aforementioned assembly device for the window retractor motor connector incorporates a pushing mechanism with a telescopic actuator, a sliding component, and a pusher. The sliding component moves closer to or further away from the placement station. Pressure sensors are installed between the sliding component and the drive unit of the telescopic actuator, or between the sliding component and the pusher. Simultaneously, displacement sensors are installed on the pusher, the sliding component, and the drive unit of the telescopic actuator. This allows the pressure sensors to detect the force applied during connector assembly and the displacement sensors to monitor the assembly stroke when one end of the connector is pushed into the insertion cavity of the motor housing at the placement station. If the assembly force exceeds a preset force or the assembly stroke is less than a preset stroke, assembly defects can be identified, thus providing direct access to product quality information and facilitating the removal of defective products. Attached Figure Description

[0016] Figure 1This is a structural view of an embodiment of the assembly device for a window retractor motor connector according to the present invention. Figure 2 This is a structural diagram from another perspective of an embodiment of the assembly device for a window retractor motor connector according to the present invention.

[0017] In the attached diagram: 1. Outer shell; 2. Connector; 3. Base plate; 4. Placement station; 41. Limiting block; 5. Pushing mechanism; 51. Telescopic actuator; 52. Sliding component; 53. Push head; 521. Guide rail; 522. Slider; 523. Connecting top block; 524. Connecting plate; 531. Outer frame; 532. Press head; 6. Monitoring sensor; 61. Pressure sensor; 62. Displacement sensor; 63. Positioning plate; 64. Adjusting frame; 631. Adjusting hole; 641. Locking hole; 7. Pin assembly; 71. Pushing actuator; 72. Press head. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 2 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0019] Figure 1 This is a structural view of an embodiment of the assembly device for a window retractor motor connector according to the present invention. Figure 2 This is a structural diagram from another perspective of an embodiment of the assembly device for a window regulator motor connector according to this utility model. (See diagram below.) Figure 1 and Figure 2 As shown, the assembly device for the window retractor motor connector provided in this embodiment is used to push one end of the connector 2 into the insertion cavity of the housing 1 of the motor's reduction structure. Furthermore, the assembly device for the window retractor motor connector provided in this embodiment includes: a base plate 3, a pushing mechanism 5, and a monitoring sensor 6. The pushing mechanism 5 pushes the connector 2 into place, while the monitoring sensor 6 detects the installation status of the connector 2. This avoids the problem of products being difficult to screen out due to deformation of the conductive pins during assembly, thus ensuring the quality of the products leaving the factory.

[0020] Specifically, the base plate 3 serves as the main carrier, placed horizontally on a base platform. The base plate 3 provides an installation carrier for subsequent structures such as the placement station 4 and the pushing mechanism 5, ensuring that these structures form a unified whole, achieving modular design and facilitating later maintenance and repair. At this point, a placement station 4 is provided at one end of the base plate 3. The placement station 4 allows the motor with the housing 1 to be placed in the corresponding assembly position, providing conditions for the subsequent insertion of one end of the connector 2 into the insertion cavity of the housing 1 using the pushing mechanism 5. Preferably, the placement station 4 is an insertion block with a socket. The motor with the housing 1 is inserted into the socket for positioning, facilitating the subsequent insertion of one end of the connector 2 into the insertion cavity of the housing 1.

[0021] Specifically, the pushing mechanism 5 is mounted on the base plate 3, achieving the arrangement of the pushing mechanism 5 and the placement station 4 on the same structure. This provides a condition for the subsequent pushing mechanism 5 to act on the outer shell 1 on the placement station 4 while ensuring overall stability. The pushing mechanism 5 includes a telescopic actuator 51, a sliding member 52, and a pusher 53. The sliding member 52 is slidably mounted on the base plate 3, allowing it to move closer to or further away from the placement station 4. This provides a condition for the subsequent pushing of the connector 2, pressing one end of the connector 2 into the insertion cavity of the outer shell 1. Simultaneously, the telescopic actuator 51 is mounted on the base plate 3, and the driving part of the telescopic actuator 51 is connected to the sliding member 52, enabling the telescopic actuator 51 to provide power for the movement of the sliding member 52 on the base plate 3. In addition, the push head 53 is installed on the side of the sliding member 52 near the placement station 4, so that when the sliding member 52 is driven by the telescopic driver 51, the push head 53 can move closer to or away from the placement station 4, thereby pushing one end of the connector 2 located at the cavity opening of the insertion cavity into the insertion cavity, and realizing the assembly of the connector 2.

[0022] Specifically, the monitoring sensor 6 used to detect the installation status of connector 2 includes a pressure sensor 61 and a displacement sensor 62. In this case, the pressure sensor 61 is installed between the telescopic actuator 51 and the sliding member 52, or between the sliding member 52 and the pusher head 53. When the pusher head 53 pushes connector 2 into the insertion cavity of the housing 1, the pressure sensor 61 can monitor the magnitude of the pushing force. If the monitored force exceeds the preset force, it is determined that connector 2 has assembly defects and is unqualified, facilitating timely detection of problematic products by operators. In addition, the displacement sensor 62 is installed on one of the drive part, sliding part 52 and push head 53 of the telescopic actuator 51, so that the assembly stroke of connector 2 can be detected by the displacement sensor 62 during installation. If the detected assembly stroke is less than the preset assembly stroke, it is judged that there is a defect in the assembly of connector 2 and the product is unqualified. This also makes it easier for operators to find problematic products in time. That is, if the monitoring data of either pressure sensor 61 or displacement sensor 62 is unqualified, it can be judged that the assembly of connector 2 is unqualified, avoiding the problem of false detection or missed detection, and the structural design is more reasonable.

[0023] More specifically, a positioning plate 63 is also provided on the base plate 3. At this time, the positioning plate 63 is located beside the placement station 4, and it faces the detection head of the displacement sensor 62. This allows the detection head of the displacement sensor 62 to cooperate with the positioning plate 63 to detect displacement stroke when the detection head of the displacement sensor 62 moves synchronously with the push head 53, ensuring the smooth operation of the displacement sensor 62. It is worth noting that the displacement sensor 62 includes, but is not limited to, commercially available contact displacement sensors 62. These sensors generate an electrical signal when the detection head extends or retracts. Specifically, the displacement sensor 62 emits an electrical signal when its detection head contacts the positioning plate 63, indicating that the assembly stroke meets the preset requirements. If the detection head of the displacement sensor 62 cannot contact the positioning plate 63, it does not emit an electrical signal, indicating that the assembly stroke is less than the preset stroke, resulting in a defective product.

[0024] More specifically, the positioning plate 63 is mounted on an adjusting frame 64. The lower end of the adjusting frame 64 is then fixedly mounted on the base plate 3, thus achieving stable mounting of the positioning plate 63 on the base plate 3. Furthermore, the adjusting frame 64 has a locking hole 641, and the positioning plate 63 has an adjusting hole 631. The adjusting hole 631 is a slotted hole, through which an adjusting screw passes and connects to the locking hole 641. Thus, the positioning plate 63 is mounted on the adjusting frame 64 via the adjusting screw, the adjusting hole 631, and the locking hole 641. Additionally, the adjusting hole 631 is arranged along the direction of movement of the drive unit of the telescopic actuator 51, allowing the position of the positioning plate 63 on the adjusting frame 64 to be changed by adjusting the position of the adjusting screw within the adjusting hole 631 when the adjusting screw is loosened. This adjusts the distance between the detection heads of the positioning and displacement sensors 62, adapting to the monitoring needs of different product specifications. It is worth noting that there are at least two locking holes 641 on the adjusting frame 64, and the number of adjusting holes 631 on the positioning plate 63 corresponds to the number of locking holes 641. This enables the positioning plate 63 to be installed on the adjusting frame 64 with multi-point positioning, preventing the positioning plate 63 from deflecting and improving the stability of the positioning plate 63 installed on the adjusting frame 64.

[0025] More specifically, a limiting hole communicating with the insertion cavity is provided on the outer shell 1, and a pin hole that mates with the limiting hole is provided on the connector 2. After one end of the connector 2 is assembled and inserted into the insertion cavity and is in place, the pin hole and the limiting hole are aligned. A positioning pin is inserted into the limiting hole and the pin hole to limit the connector 2 in the insertion cavity of the outer shell 1, preventing the connector 2 from coming out of the insertion cavity after installation, thus improving the stability and reliability of the connector 2 after installation.

[0026] More specifically, a pin assembly 7 is also provided on the base plate 3. This pin assembly 7 includes a mounting bracket, a push driver 71, and a pressing head 72. The lower end of the mounting bracket is mounted on the base plate 3 and located beside the placement station 4. Preferably, the mounting bracket can directly utilize the adjustment frame 64 of the aforementioned mounting positioning plate 63, thus reusing the adjustment frame 64. Simultaneously, the push driver 71 is arranged vertically downwards and mounted on the upper end of the mounting bracket, meaning the push driver 71 is stably mounted above the placement station 4 via the mounting bracket. Furthermore, the pressure pin 72 is mounted on the drive shaft of the push driver 71, enabling the push driver 71 to move the pressure pin 72 vertically. When the motor to be assembled is placed on the placement station 4, the limiting hole on the housing 1 is directly below the pressure pin 72 in the vertical direction. That is, when both the pressure sensor 61 and the displacement sensor 62 detect a qualified reading, the push driver 71 can be activated, and the pressure pin 72 will press the positioning pin into the limiting hole and the pin hole, thus installing the positioning pin. Since the positioning pin is a structure to prevent the connector 2 from falling off after assembly, it can also serve as part of the assembly device. It is worth noting that the push driver 71 is preferably a cylinder, which can meet the requirements of linear motion and has low manufacturing and usage costs.

[0027] More specifically, the sliding component 52 for mounting the pusher head 53 includes a guide rail 521, a slider 522, a connecting top block 523, and a connecting plate 524. During installation, the guide rail 521 is mounted on the base plate 3 and arranged parallel to the movement direction of the drive part of the telescopic actuator 51. The slider 522 is slidably mounted on the guide rail 521, and the connecting top block 523 is mounted on the slider 522. At the same time, the pusher head 53 is mounted on the connecting top block 523, so that the pusher head 53 can be slidably mounted on the guide rail 521 through the connecting top block 523 and the slider 522, providing stable guidance for the movement of the pusher head 53. This ensures that when the pusher head 53 pushes the connector 2, the direction of the force exerted by the pusher head 53 on the connector 2 will not deviate, ensuring that the connector 2 can be smoothly and stably inserted into the insertion cavity. Furthermore, one end of the connecting plate 524 is connected to the connecting top block 523, and the other end of the connecting plate 524 is connected to the driving part of the telescopic actuator 51. That is, the connecting plate 524 serves as a transition structure between the connecting top block 523 and the telescopic actuator 51, allowing for adaptive adjustment of the installation position while meeting transmission requirements, resulting in a more rational structural design. It is worth noting that the pressure sensor 61 is positioned between the connecting top block 523 and the connecting plate 524, enabling the force transmitted from the telescopic actuator 51 to the sliding member 52 to directly act on the pressure sensor 61. This allows for more accurate detection of the force exerted during the assembly of the connector 2, ensuring accurate detection results.

[0028] More specifically, the telescopic actuator 51 of the pushing mechanism 5 is preferably an electric push rod, which makes the telescopic actuator 51 more accurate and provides conditions for accurately controlling the assembly stroke of the push head 53 to assemble the connector 2 into the insertion cavity.

[0029] More specifically, the displacement sensor 62 used to monitor the travel of the push head 53 is mounted on the drive unit of the telescopic actuator 51, so that the position signal monitored by the displacement sensor 62 is directly the travel of the drive unit of the telescopic actuator 51, which directly reflects the assembly travel of the connector 2. This avoids the problem of excessive assembly gaps caused by arranging more adapter structures, which would reduce the monitoring accuracy. The structural design is more reasonable.

[0030] More specifically, the pusher 53 set on the sliding member 52 includes an outer frame 531 and a pressure head 532. The outer frame 531 is fixedly installed on the connecting top block 523, so that the outer frame 531 can move with the connecting top block 523. At the same time, the outer frame 531 has an inner cavity, one end of the pressure head 532 is inserted into the inner cavity, and the other end of the pressure head 532 is arranged facing the placement station 4. That is, the outer frame 531 serves as a transition structure between the pressure head 532 and the connecting top block 523, which allows for the installation and removal of pressure heads 532 of different specifications on the outer frame 531. Thus, it can adapt to the assembly scenarios of window swing motors of different specifications by only replacing the pressure head 532, resulting in better structural adaptability and reduced usage costs.

[0031] More specifically, a protruding limiting block 41 is provided on the placement station 4 and on the side away from the push head 53. The limiting block 41 increases the contact area of ​​the placement station 4 on the side away from the push head 53, so that when the motor is placed on the placement station 4, the side of the motor away from the connector 2 assembly has a larger contact area for support, which further improves the stability of the motor assembly.

[0032] The assembly device for the window retractor motor connector provided in this embodiment includes a base plate 3, a pushing mechanism 5, and a monitoring sensor 6. A placement station 4 and a pushing mechanism 5 are provided on the base plate 3. The telescopic driver 51 in the pushing mechanism 5 is poweredly connected to a sliding member 52. A push head 53 is installed on the sliding member 52. A pressure sensor 61 of the monitoring sensor 6 is provided between the push head 53 and the sliding member 52, or between the sliding member 52 and the telescopic driver 51. Simultaneously, a displacement sensor 62 with synchronous movement is also provided in the pushing mechanism 5. When the connector 2 is pushed into the insertion cavity of the housing 1 by the push head 53, the pressure sensor 61 and the displacement sensor 62 can respectively detect the assembly force and assembly stroke. If either of these fails to meet the preset conditions, the product is determined to have an assembly defect. This allows for timely acquisition of the current product's quality information, preventing defective products from being mixed with qualified products and ensuring the quality of the products leaving the factory.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An assembly device for a window regulator motor connector, wherein one end of the connector is pushed into the insertion cavity of the housing, characterized in that, include: A base plate, one end of which is provided with a placement station; A pushing mechanism is disposed on the base plate. The pushing mechanism includes a telescopic driver, a sliding member, and a pusher head. The sliding member is slidably disposed on the base plate. The telescopic driver is mounted on the base plate, and the driving part of the telescopic driver is connected to the sliding member. The pusher head is mounted on the side of the sliding member near the placement station. The monitoring sensors include a pressure sensor and a displacement sensor. The pressure sensor is installed between the telescopic actuator and the sliding member or between the sliding member and the push head. The displacement sensor is installed on one of the drive unit of the telescopic actuator, the sliding member, and the push head.

2. The assembly apparatus for the window regulator motor connector according to claim 1, characterized in that, It also includes a positioning plate, which is mounted on the base plate and located beside the placement station, with the detection head of the displacement sensor facing the positioning plate.

3. The assembly apparatus for the window regulator motor connector according to claim 2, characterized in that, The positioning plate is mounted on an adjusting frame, the lower end of which is fixedly mounted on the base plate. The adjusting frame has a locking hole, and the positioning plate has an adjusting hole. The adjusting hole is a strip-shaped hole, and an adjusting screw passes through the adjusting hole and connects to the locking hole.

4. The assembly apparatus for the window regulator motor connector according to claim 1, characterized in that, The outer shell has a limiting hole that communicates with the insertion cavity, and the connector has a pin hole that mates with the limiting hole. After one end of the connector is assembled and inserted into the insertion cavity and installed in place, the pin hole is aligned with the limiting hole, and a positioning pin is inserted into the limiting hole and the pin hole.

5. The assembly apparatus for the window regulator motor connector according to claim 4, characterized in that, It also includes a pin assembly, which includes a mounting bracket, a push driver, and a pressing head. The lower end of the mounting bracket is mounted on the base plate and located beside the placement station. The push driver is arranged vertically downward and mounted on the upper end of the mounting bracket. The pressing head is mounted on the drive shaft of the push driver. The limiting hole on the housing is located directly below the pressing head in the vertical direction.

6. The assembly apparatus for the window regulator motor connector according to claim 1, characterized in that, The sliding component includes a guide rail, a slider, a connecting top block, and a connecting plate. The guide rail is mounted on the base plate and arranged parallel to the movement direction of the drive unit of the telescopic actuator. The slider is slidably disposed on the guide rail, and the connecting top block is mounted on the slider. At the same time, the push head is mounted on the connecting top block. One end of the connecting plate is connected to the connecting top block, and the other end of the connecting plate is connected to the drive unit of the telescopic actuator.

7. The assembly apparatus for the window regulator motor connector according to claim 1, characterized in that, The telescopic actuator is an electric push rod.

8. The assembly apparatus for the window regulator motor connector according to claim 1, characterized in that, The displacement sensor is mounted on the drive unit of the telescopic actuator.

9. The assembly apparatus for the window regulator motor connector according to claim 6, characterized in that, The pusher includes an outer frame and a pressure head. The outer frame is fixedly installed on the connecting top block. The outer frame has an inner cavity. One end of the pressure head is inserted into the inner cavity, and the other end of the pressure head is arranged towards the placement station.

10. The assembly apparatus for the window regulator motor connector according to claim 1, characterized in that, A protruding limiting block is also provided on the placement station and on the side opposite to the pusher.

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