Plate turning device for flexible circuit board

Abstract

The utility model discloses a plate turnover device for a flexible circuit board. The plate turnover device comprises a bottom plate; the base is arranged on the bottom plate and is in sliding connection with the bottom plate; the first driving assembly is connected with the base and used for driving the base to reciprocate in the length direction of the bottom plate; the turnover mechanism is arranged on the base and comprises a rotating shaft, a turnover plate and a second driving assembly, the rotating shaft is rotatably arranged on the base, the turnover plate is connected with the rotating shaft, the second driving assembly is connected with the rotating shaft, and the second driving assembly drives the rotating shaft to rotate in the process that the base moves on the bottom plate. The plate turnover device can improve the plate turnover efficiency and reduce the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board processing equipment, in particular to a turning device for a flexible circuit board. Background Art

[0002] Flexible Printed Circuit (FPC) is a highly reliable and flexible printed circuit board made of polyimide or polyester film. It has advantages that other types of circuit boards cannot match, such as high wiring density, light weight, thin thickness, foldable and bendable, three-dimensional wiring, and safety performance.

[0003] In the flexible circuit board manufacturing industry, flexible circuit boards, semi-finished products, or tooling require double-sided processing in many processes. During assembly line production, when one side is finished and the other side is ready, the flexible circuit board often has to be manually flipped. This manual flipping method is inefficient and increases production costs. Utility Model Content

[0004] In view of this, the present invention aims to provide a flipping device for a flexible circuit board, so as to improve the flipping efficiency and reduce the production cost.

[0005] In order to solve the above technical problems, the embodiment of the present utility model provides a flip device for a flexible circuit board, comprising:

[0006] base plate;

[0007] A base, disposed on the bottom plate and slidably connected to the bottom plate;

[0008] A first driving assembly is connected to the base and is used to drive the base to move back and forth in the length direction of the base plate;

[0009] The flipping mechanism is arranged on the base and includes a rotating shaft, a flip plate and a second drive component. The rotating shaft is rotatably arranged on the base, the flip plate is connected to the rotating shaft, and the second drive component is connected to the rotating shaft. When the base moves on the bottom plate, the second drive component drives the rotating shaft to rotate, thereby driving the flip plate to flip.

[0010] Optionally, a slide rail extending along the length direction of the bottom plate is provided on the bottom plate, and sliders are respectively provided on both sides of the bottom of the base, and the sliders are slidably connected to both sides of the slide rail.

[0011] Optionally, the first drive assembly includes: a first drive motor, a first driving wheel, a transmission wheel and a first transmission belt, the fixed end of the first drive motor is fixed to the base, the driving end of the first drive motor is connected to the first driving wheel, and the first transmission belt is wound around the first driving wheel and the transmission wheel.

[0012] Optionally, the transmission wheel includes a first driven wheel, a second driven wheel and a third driven wheel, the first driving wheel and the first driven wheel are arranged parallel to one side surface of the base, and the third driven wheel and the second driven wheel are arranged below the first driving wheel and the first driven wheel respectively.

[0013] Optionally, after the first transmission belt is wound around the inner sides of the second driven wheel and the third driven wheel, it extends side by side with the slide rail to both ends of the base plate, and both ends of the first transmission belt are fixed to the base plate through fixing components.

[0014] Optionally, the fixing assembly includes a support seat and a pressing block, the support seat is fixed to the base plate, the end of the first transmission belt is fixed to the support seat, and the pressing block is fixed to the support seat and presses the end of the first transmission belt.

[0015] Optionally, the bottom edge of the second driven wheel and the bottom edge of the third driven wheel are both flush with the upper surface of the support seat.

[0016] Optionally, the second drive assembly includes a reduction motor, a second driving wheel, a fourth driven wheel and a second transmission belt. The first driven wheel is connected to the input end of the reduction motor, the second driving wheel is connected to the output end of the reduction motor, the second transmission belt is wound around the second driving wheel and the fourth driven wheel, and the rotating shaft passes through the wheel center of the fourth driven wheel and is fixedly connected to the fourth driven wheel.

[0017] Optionally, the flipping mechanism further includes a plurality of clamping members, one end of the clamping member is fixedly connected to the rotating shaft, and the other end is used to clamp the flip plate.

[0018] Optionally, limit detection sensors are provided at both ends of the bottom plate to detect whether the base reaches the end of the bottom plate.

[0019] The beneficial effects of the utility model are:

[0020] According to the flip device for a flexible circuit board provided by the utility model, the base is arranged on the bottom plate, and the base is driven to move back and forth in the length direction of the bottom plate by the first drive assembly. A rotating shaft is arranged on the base, the flip plate is connected to the rotating shaft, and the driving end of the second drive assembly is fixedly connected to the rotating shaft. In the process of the first drive assembly driving the base to move from one side of the bottom plate to the other side, the second drive assembly drives the rotating shaft to rotate, thereby driving the flip plate to rotate, completing the flipping of the flip plate, and then completing the turning over of the flexible circuit board. According to the flip device provided by the utility model, the flipping can be completed automatically, realizing automated production, improving production efficiency, reducing production costs, and ensuring product quality because manual flipping is not required; in addition, in the process of flipping the flip plate, the base supporting the flipping mechanism slides from one side to the other side on the bottom plate, and the flipping operation can be completed in the original space of the flip device, occupying a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. The parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 A schematic diagram showing the three-dimensional structure of a flip device for a flexible circuit board provided by an embodiment of the present invention Figure 1 ;

[0023] Figure 2 A schematic diagram showing the three-dimensional structure of a flip device for a flexible circuit board provided by an embodiment of the present invention Figure 2 ;

[0024] Figure 3 A schematic diagram of a partial three-dimensional structure of a flap device provided in one embodiment of the present utility model is shown;

[0025] Figure 4 Show Figure 1 A partial enlarged schematic diagram of part A.

[0026] Description of the component numbers in the accompanying drawings:

[0027] 1. Bottom plate, 11. Slide rail, 2. Base, 21. Slider, 22. Bearing, 3. First drive assembly, 31. First drive motor, 32. First driving wheel, 33. First transmission belt, 34. First driven wheel, 35. Second driven wheel, 36. Third driven wheel, 4. Rotating shaft, 5. Flip plate, 6. Second drive assembly, 61. Reducer motor, 62. Second driving wheel, 63. Second transmission belt, 64. Fourth driven wheel, 7. Clamping member, 8. Fixing assembly, 81. Support seat, 82. Press block, 9. Limit detection sensor. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0029] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a detailed and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention.

[0030] Unless otherwise specified, the terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] like Figures 1 to 3 As shown, Figure 1 A schematic diagram of the three-dimensional structure of a flip device for a flexible circuit board provided in one embodiment of the present invention Figure 1 ; Figure 2 A schematic diagram of the three-dimensional structure of a flip device for a flexible circuit board provided in one embodiment of the present invention Figure 2 ; Figure 3 This is a partial structural diagram of the base portion of a flip device provided in one embodiment of the present invention. In this embodiment, the flip device for a flexible circuit board includes:

[0034] Base plate 1;

[0035] A base 2 is provided on the bottom plate 1 and is slidably connected to the bottom plate 1;

[0036] A first driving assembly 3 is connected to the base 2 and is used to drive the base 2 to move back and forth in the length direction of the base plate 1;

[0037] The flipping mechanism is arranged on the base 2 and includes a rotating shaft 4, a flap 5 and a second drive component 6. The rotating shaft 4 is rotatably arranged on the base 2, the flap 5 is connected to the rotating shaft 4, and the second drive component 6 is connected to the rotating shaft 4. When the base 2 moves on the bottom plate 1, the second drive component 6 drives the rotating shaft 4 to rotate, thereby driving the flap 4 to flip.

[0038] In this embodiment, the base 2 is provided on the bottom plate 1, and the base 2 is driven to move back and forth in the length direction of the bottom plate 1 by the first drive assembly 3. A rotating shaft 4 is provided on the base 2, the flap 5 is connected to the rotating shaft 4, and the driving end of the second drive assembly 6 is fixedly connected to the rotating shaft 4. In the process of the first drive assembly 3 driving the base 2 to move from one side of the bottom plate 1 to the other side, the second drive assembly 6 drives the rotating shaft 4 to rotate, thereby driving the flap 5 to rotate, completing the flipping of the flap 5, and then completing the flipping of the flexible circuit board. According to the flipping device provided by the utility model, the flipping can be completed automatically, realizing automated production, improving production efficiency, reducing production costs, and ensuring product quality because there is no need for manual flipping; in addition, in the process of flipping the flap 5, the base 2 supporting the flipping mechanism slides from one side to the other side on the bottom plate 1, and the flipping operation can be completed in the original space of the flipping device, occupying a small area.

[0039] Specifically, the base plate 1 is a rectangular flat plate, the base 2 is arranged on the base plate 1 and is slidingly connected to the upper surface of the base plate 1, and the driving end of the first driving component 3 is connected to the base 2, which is used to drive the base 2 to move back and forth in the length direction of the base plate 1.

[0040] The base 2 includes a bottom portion and first and second side portions vertically disposed on either side of the bottom portion. The first and second side portions are spaced apart from each other in the width direction of the base plate 1 and extend along the length of the base plate 1. Bearing holes are provided above each of the first and second side portions, facing each other and co-located. Bearings 22 are mounted in the bearing holes. The shaft 4 is rotatably mounted on the base 2 via the bearings 22 on the first and second side portions.

[0041] One side of the flap 5 is fixedly connected to the rotating shaft 4 , so that the flap 5 is driven to rotate by the rotation of the rotating shaft 4 .

[0042] Flexible circuit boards are typically provided with pre-set holes. In this embodiment, fixing posts are provided on the flap 5 at positions corresponding to the pre-set holes in the flexible circuit board. When the flexible circuit board is on the flap 5, the fixing posts are inserted through the corresponding pre-set holes, thereby securing the flexible circuit board to the flap 5. Furthermore, to protect the flexible circuit board, the flexible circuit board is covered with a protective layer made of steel. Therefore, the flap 5 is configured to be magnetic. When the flexible circuit board is on the flap 5, the magnetic force between the flap 5 and the protective layer secures the flexible circuit board, preventing the flexible circuit board from slipping or shifting.

[0043] In this embodiment, at the starting position, base 2 is located at one end of base plate 1, and flap 5 is horizontal. As first drive assembly 3 drives base 2 to move, second drive assembly 6 rotates shaft 4, thereby driving flap 5. When base 2 reaches the other end of base plate 1, flap 5 completes a 180° flip.

[0044] Furthermore, a slide rail 11 extending along the length direction of the base plate 1 is provided on the base plate 1 , and sliders 21 are respectively provided on both sides of the bottom of the base 2 , and the sliders 21 are slidably connected to both sides of the slide rail 11 .

[0045] Specifically, in the width direction of the bottom plate 1, sliders 21 are respectively provided on both sides of the bottom of the base 2 for sliding connection with both sides of the slide rail 11. This technical solution is convenient for installation and maintenance, and has a strong bearing capacity.

[0046] Furthermore, in this embodiment, the first drive assembly 3 includes a first drive motor 31, a first driving pulley 32, a transmission pulley, and a first transmission belt 33. The fixed end of the first drive motor 31 is fixed to the base 2, the driving end of the first drive motor 31 is connected to the first driving pulley 32, and the first transmission belt 33 is wound around the first driving pulley 32 and the transmission pulley. Thus, a smooth transmission can be achieved.

[0047] The first driving motor 31 drives the first driving wheel 32 to rotate, and the first transmission belt 33 wound around the first driving wheel 32 and the transmission wheel drives the transmission wheel to rotate, thereby driving the base 2 to move.

[0048] It is worth noting that in other embodiments of the present invention, the first drive component 3 can also be other structures. For example, the first drive component 3 includes a servo motor, a screw rod and a slider. The slider is mounted on the screw rod, and the screw rod is driven to rotate by the servo motor, thereby driving the slider to move along the screw rod, and then driving the base to move.

[0049] Optionally, in this embodiment, the transmission wheel includes a first driven wheel 34, a second driven wheel 35 and a third driven wheel 36, the first driving wheel 32 and the first driven wheel 34 are arranged in parallel on one side surface of the base 2, and the third driven wheel 36 and the second driven wheel 35 are arranged below the first driving wheel 32 and the first driven wheel 34 respectively.

[0050] This technical solution not only saves space, but also increases the contact area between the transmission belt and the transmission wheel, making the operation smoother.

[0051] Optionally, a tensioning wheel is provided between the first driving wheel 32 and the first driven wheel 34 to adjust the tension of the first transmission belt 33 .

[0052] Furthermore, after the first transmission belt 33 is wound around the inner sides of the second driven wheel 35 and the third driven wheel 36 , it extends side by side with the slide rail 11 to both ends of the base plate 1 , and both ends of the first transmission belt 33 are fixed to the base plate 1 through fixing components 8 .

[0053] Specifically, one end of the first transmission belt 33 is fixed to one end of the base plate 1 via a fixing assembly 8, and the other end is fixed to the other end of the base plate 1 via a fixing assembly 8. One end of the first transmission belt 33 extends from the end fixed to one end of the base plate 1, passes around the inside of the third driven pulley 36, passes through the first driving pulley 32 and the first driven pulley 34, and then passes around the inside of the second driven pulley 35, extending to the other end of the base plate 1 and being fixed there.

[0054] Therefore, the first drive motor 31 transmits power to the first transmission belt 33 through the first driving wheel 32. Since the two ends of the first transmission belt 33 are fixed, the base 2 can move along the slide rail 11 on the base plate 1 through the slider 21 with the cooperation of the first transmission belt 33 and the second driven wheel 35 and the third driven wheel 36.

[0055] Furthermore, if Figure 4 As shown, in this embodiment, the fixing assembly 8 includes a support seat 81 and a pressure block 82, the support seat 81 is fixed on the base plate 1, the end of the first transmission belt 33 is fixed on the support seat 81, and the pressure block 82 is fixed on the support seat 81 and presses the end of the first transmission belt 33.

[0056] As a result, both ends of the first transmission belt 33 are located between the support base 81 and the pressing block 82 and are compressed by the pressing block 82, which not only facilitates the fixation of the first transmission belt 33 but also facilitates maintenance of the first transmission belt 33. For example, if the first transmission belt 33 becomes loose due to long-term use, the first transmission belt 33 can be replaced or adjusted.

[0057] Optionally, the end of the first transmission belt 33 is fixed to the support seat 81 by screws, the pressing block 82 is pressed onto the support seat 81, and the pressing block 82 and the support seat 81 are fixedly connected by screws.

[0058] Furthermore, the bottom edges of the second driven wheel 35 and the third driven wheel 36 are both flush with the upper surface of the support seat 81 .

[0059] In this way, the first transmission belt 33 can be prevented from breaking or getting stuck, thereby preventing the production process from being affected.

[0060] Furthermore, the second drive assembly 6 includes a reduction motor 61, a second driving wheel 62, a fourth driven wheel 64 and a second transmission belt 63. The first driven wheel 34 is connected to the input end of the reduction motor 61, and the second driving wheel 62 is connected to the output end of the reduction motor 61. The second transmission belt 63 is wound around the second driving wheel 62 and the fourth driven wheel 64. The rotating shaft 4 passes through the wheel center of the fourth driven wheel 64 and is fixedly connected to the fourth driven wheel 64.

[0061] Specifically, the input end of the reduction motor 61 is connected to the first driven pulley 34, and the output end is connected to the second driving pulley 62. The second transmission belt 63 is wound around the second driving pulley 62 and the fourth driven pulley 64. The fourth driven pulley 64 is fixedly connected to the rotating shaft 4. The rotating shaft 4 passes through the bearing 22 on the first side, the fourth driven pulley 64, and the bearing 22 on the second side in sequence. The rotating shaft 4 is supported by the bearings 22 on the first side and the second side, and is driven to rotate by the fourth driven pulley 64.

[0062] When the first driven wheel 34 rotates, it drives the output shaft of the reduction motor 61 to rotate. The rotation of the output shaft of the reduction motor 61 drives the second driving wheel 62 to rotate. Through the cooperation of the second driving wheel 62, the fourth driven wheel 64 and the second transmission belt 63, the rotating shaft 4 and the flap 5 on the rotating shaft 4 are driven to rotate, thereby completing the flipping of the flap 5.

[0063] Furthermore, the flip mechanism further includes a plurality of clamping members 7 , one end of the clamping member 7 is fixedly connected to the rotating shaft 4 , and the other end is used to clamp the flip plate 5 .

[0064] By arranging a plurality of clamping members 7 on the rotating shaft 4, flaps 5 of different specifications can be clamped by changing the number and spacing of the clamping members 7, so that the flap device can be applied to more occasions.

[0065] Optionally, the clamping member 7 is a U-shaped clamping member. Thus, by utilizing the U-shaped clamping member to clamp the flap 5, not only the flap 5 can be clamped, but also the flap 5 can be easily replaced.

[0066] One end of the U-shaped clamp is fixedly connected to the rotating shaft 4, and the other end includes two ends that form an opening and extend outward. The opening between the two ends is used to place the flap 5 and clamp the flap 5 through the two ends. Optionally, the sides of the two ends facing each other are chamfered to facilitate smoother insertion of the flap 5.

[0067] Furthermore, limit detection sensors 9 are respectively provided at both ends of the bottom plate 1 for detecting whether the base 2 reaches the end of the bottom plate 1 .

[0068] This embodiment further includes a control unit electrically connected to the limit detection sensor 9 and the first drive motor 31. When the limit detection sensor 9 detects the base 2, it sends a detection signal to the control unit. Upon receiving the detection signal, the control unit controls the first drive motor 31 to stop. Thus, by detecting whether the base 2 has reached the end of the base plate 1 through the limit detection sensor 9, the base 2 can be prevented from sliding off the slide rail 11.

[0069] Furthermore, the two ends of the bottom plate 1 are respectively provided with:

[0070] An in-position detection sensor is used to detect whether the flexible circuit board has been transferred from the previous process to the flipping device, and when the flexible circuit board is detected, the flipping device is activated; and

[0071] The out-of-position detection sensor is used to detect whether the flexible circuit board is transferred out of the flipping device after the flipping 5 is completed. When the flexible circuit board is not detected, the flipping device moves back to its original position.

[0072] The working principle of the flap device: When the base 2 is at the starting position at one end of the base plate 1, the flap 5 is in a horizontal state, and the flexible circuit board is fixed to the upper surface of the flap 5. The first drive motor 31 provides power to the first driving wheel 32 to drive its rotation. The first driving wheel 32 transmits power to the first transmission belt 33 and, through cooperation with the first driven wheel 34, the second driven wheel 35, and the third driven wheel 36, drives the base 2 toward the other end of the base plate 1. During the rotation of the first driven wheel 34, the first driven wheel 34 transmits power to the input end of the reduction motor 61, which drives the second driving wheel 62 to rotate. When the second driving wheel 62 rotates, the second driving wheel 62 transmits power to the fourth driven wheel 64 via the second transmission belt 63, driving the fourth driven wheel 64 to rotate. The second driving wheel 62, the fourth driven wheel 64, and the second transmission belt 63 cooperate to drive the rotation shaft 4 and the clamping member 7 on the rotating shaft 4 to rotate, thereby driving the flap 5 on the clamping member 7 to flip. When the base 2 reaches the end of the slide rail 11, the flap 5 flips 180 degrees, completing the flip of the flexible circuit board. After the flexible circuit board enters the next process, the base 2 returns to the starting position and the flap 5 returns to its initial state.

[0073] The flipping device for a flexible circuit board provided by the utility model can automatically complete the flipping, realize automated production, improve production efficiency, reduce production costs, ensure product quality, and occupy a small area.

[0074] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, any equivalent modifications or alterations accomplished by a person skilled in the art based on the spirit and technical concepts disclosed in this utility model shall be covered by the claims of this utility model.

Claims

1. A flip device for a flexible circuit board, characterized in that: include: base plate; A base, disposed on the bottom plate and slidably connected to the bottom plate; a first driving assembly connected to the base, for driving the base to reciprocate in the length direction of the base plate; The flipping mechanism is arranged on the base and includes a rotating shaft, a flip plate and a second drive component. The rotating shaft is rotatably arranged on the base, the flip plate is connected to the rotating shaft, and the second drive component is connected to the rotating shaft. When the base moves on the bottom plate, the second drive component drives the rotating shaft to rotate, thereby driving the flip plate to flip.

2. The flap device according to claim 1, characterized in that: The bottom plate is provided with a slide rail extending along the length direction of the bottom plate, and two sides of the bottom of the base are respectively provided with sliders, and the sliders are slidably connected to the two sides of the slide rail.

3. The flap device according to claim 2, characterized in that: The first drive assembly includes: a first drive motor, a first driving wheel, a transmission wheel and a first transmission belt. The fixed end of the first drive motor is fixed to the base, the driving end of the first drive motor is connected to the first driving wheel, and the first transmission belt is wound around the first driving wheel and the transmission wheel.

4. The flap device according to claim 3, characterized in that: The transmission wheel includes a first driven wheel, a second driven wheel and a third driven wheel. The first driving wheel and the first driven wheel are arranged in parallel on a side surface of the base. The third driven wheel and the second driven wheel are arranged below the first driving wheel and the first driven wheel respectively.

5. The flap device according to claim 4, characterized in that: After being wound around the inner sides of the second driven wheel and the third driven wheel respectively, the first transmission belt extends side by side with the slide rail to the two ends of the base plate, and the two ends of the first transmission belt are respectively fixed to the base plate through fixing components.

6. The flap device according to claim 5, characterized in that: The fixing assembly includes a support seat and a pressure block, the support seat is fixed to the base plate, the end of the first transmission belt is fixed to the support seat, and the pressure block is fixed to the support seat and presses the end of the first transmission belt.

7. The flap device according to claim 6, characterized in that: The bottom edge of the second driven wheel and the bottom edge of the third driven wheel are both flush with the upper surface of the support seat.

8. The flap device according to claim 5, characterized in that: The second drive assembly includes a reduction motor, a second driving wheel, a fourth driven wheel and a second transmission belt. The first driven wheel is connected to the input end of the reduction motor, the second driving wheel is connected to the output end of the reduction motor, the second transmission belt is wound around the second driving wheel and the fourth driven wheel, and the rotating shaft passes through the wheel center of the fourth driven wheel and is fixedly connected to the fourth driven wheel.

9. The flap device according to claim 1, wherein: The flip mechanism further comprises a plurality of clamping members, one end of each clamping member is fixedly connected to the rotating shaft, and the other end is used for clamping the flip plate.

10. The flap device according to claim 1, wherein: Limit detection sensors are respectively provided at both ends of the bottom plate for detecting whether the base reaches the end of the bottom plate.

Images