A fine rod material orientation feeding mechanism
By using a fine bar feeding mechanism with a drop hole design and a rotating reversing sleeve, the problem of using the larger diameter end of a solid bar as the head for feeding is solved, achieving precise adjustment of the bar orientation and efficient feeding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINCHANG COUNTY DONGBA INTELLIGENT TECH CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-07
AI Technical Summary
Existing technologies make it difficult to use the larger diameter end of a solid bar as the head for conveying, and common bar orientation adjustment methods cannot effectively solve this problem.
The fine bar stock orientation feeding mechanism includes a conveying component, an orientation component, a dropping plate, a guide bucket, a reversing sleeve, and a reversing drive component. The orientation of the bar stock is adjusted by the design of the dropping hole and the rotation of the reversing sleeve, so that the larger diameter end is used as the head for conveying.
This technology enables precise conveying of the larger diameter end of the thin bar stock as the head, improving the accuracy and efficiency of the bar stock conveying process.
Smart Images
Figure CN224466864U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bar stock conveying, and in particular to a fine bar stock orientation feeding mechanism. Background Technology
[0002] Bar stock is a common raw material in machining. Whether in processing or assembly, bar stock and bar-like materials involve the conveying process. Since some bar stock may have different structures at both ends, the conveying process also involves adjusting the orientation of the bar stock ends to ensure that the ends of the bar stock are consistent with the conveying direction.
[0003] There are generally two common methods for adjusting the orientation of bar stock. Depending on the characteristics of the bar stock, one method is to use the difference in weight at both ends of the bar stock and set up a drop port. By allowing the heavier end of the bar stock to fall first, the heavier end of the bar stock is transported as the head in the conveying direction. This is used for bar stock that is solid at one end and hollow at the other. The other method is to use the difference in diameter at both ends of the bar stock and set up a drop port. By adjusting the width of the drop port, the end of the bar stock with the smaller diameter falls first, and the end of the bar stock with the smaller diameter is transported as the head in the conveying direction.
[0004] However, the above adjustment method cannot be well implemented for situations where the larger diameter end of the solid bar needs to be used as the head for transport in the same direction as the conveyor. (See attached image) Figure 1 The solid thin bar 10 shown has a large diameter at one end and a small diameter at the other end. The larger diameter end of the thin bar 10 needs to be used as the head for transportation. Therefore, a suitable feeding mechanism that can adjust the orientation needs to be designed. Utility Model Content
[0005] In order to realize the feeding process of solid bar stock with the large diameter end first, this application provides a fine bar stock orientation feeding mechanism.
[0006] The fine bar material feeding mechanism provided in this application adopts the following technical solution:
[0007] A fine bar feeding mechanism includes a conveying component and a pointing component. The pointing component includes a dropping plate, a guide hopper, a reversing sleeve, and a reversing drive. The conveying component transports the fine bar to the dropping plate. The dropping plate has a dropping hole for the fine bar to pass through. The width of the middle of the dropping hole is greater than the larger diameter of the fine bar. The widths at both ends of the dropping hole are between the larger and smaller diameters of the fine bar. The length of the larger portion of the middle width of the dropping hole is less than the length of the fine bar. The guide hopper is located below the dropping hole and receives the falling fine bar. The guide hopper has a guiding space inside for the fine bar to pass through. The guiding space is wider at the top and narrower at the bottom, with an elongated bottom and an opening for the fine bar to exit. The reversing sleeve is located below the guide hopper and has a reversing groove for receiving the fine bar exiting from the guiding space. The reversing drive drives the reversing sleeve to rotate.
[0008] By adopting the above technical solution, the thin bar material is continuously fed to the discharge plate by the conveying component. The thin bar material enters the guide hopper through the discharge hole on the discharge plate. Due to the small width at both ends of the discharge hole, the thin bar material always falls into the guide hopper with the smaller diameter end first. This ensures that the thin bar material output from the guide hopper always has the smaller diameter end first. After the thin bar material enters the reversing sleeve, the reversing drive component drives the reversing sleeve to rotate, causing the thin bar material in the reversing groove to fall out of the reversing groove again. During this process, the orientation of the thin bar material is changed, so that the larger diameter end of the thin bar material is the first end to be conveyed. Finally, the larger diameter end of the thin bar material is used as the head for the direction-oriented feeding process.
[0009] Optionally, the orientation component further includes a first laser sensor switch, which is disposed on the side of the reversing sleeve, and the reversing sleeve has an orientation laser hole that passes through the reversing slot for the laser to pass through.
[0010] By adopting the above technical solution, the rotation process of the reversing sleeve can be more accurately controlled by detecting whether a thin bar has fallen into the reversing sleeve through the first laser sensing switch.
[0011] Optionally, the reversing assembly further includes a receiving sleeve located on the side of the reversing sleeve away from the guide hopper. The receiving sleeve extends vertically and receives the fine bar material output by the reversing sleeve. A conveying pipe extends from the side of the receiving sleeve away from the reversing sleeve.
[0012] By adopting the above technical solution, the receiving sleeve is used as a transfer receiver to receive the fine bar material after the reversal is completed. The process of the fine bar material being output from the reversal groove is more stable and less likely to be thrown out. The conveying pipe set at the bottom of the receiving sleeve can better output the fine bar material.
[0013] Optionally, the orientation component further includes a second laser sensor switch, which is disposed on the side of the receiving sleeve, and the receiving sleeve has an output laser hole that penetrates the internal space for the laser to pass through.
[0014] By adopting the above technical solution, a second laser sensing switch is set to detect the passage of the thin bar in the receiving sleeve, thereby controlling whether the thin bar falls into the dropping plate, and controlling the whole process more precisely, so that the thin bar is reversed and output in sequence, and it is not easy for errors to affect the conveying process.
[0015] Optionally, the orientation component further includes an association plate, one end of which is fixed to the guide bucket, and the other end is for mounting the receiving sleeve. The reversing drive is mounted in the middle of the association plate and the reversing sleeve is mounted thereon.
[0016] By adopting the above technical solution, the positional relationship between the various components is more accurate, especially the positional relationship between the reversing sleeve and the receiving sleeve. This makes the reversing sleeve less prone to interference and ensures normal transport. Compared to installing the reversing sleeve and the receiving sleeve on different devices, it is less likely to cause misalignment due to movement. Compared to installing them on the same device, the structure is simpler and does not require more suspended structures for installation.
[0017] Optionally, the conveying assembly includes a conveyor belt, a positioning block, a pushing cylinder, and a pushing block. The pushing block and the dropping plate are respectively located on both sides of the conveyor belt in the conveying direction. The positioning block is set on the conveyor belt and prevents the thin bar material from continuing to move after reaching the position corresponding to the dropping plate. The pushing cylinder drives the pushing block to move towards the dropping plate.
[0018] By adopting the above technical solution, the conveyor belt continuously transports thin bars, the positioning block accurately controls the alignment of the thin bars at the drop plate, and then the pusher block is driven by the pusher cylinder to push the thin bars that have reached the positioning block to drop them, so that the thin bars fall accurately into the corresponding position of the drop hole on the drop plate, and finally ensure the accuracy of the initial reversal of the thin bars.
[0019] Optionally, the conveying assembly further includes an alignment block, the upper part of which is connected to the pushing block, and the lower part of which forms a pushing space for the fine bar material to enter.
[0020] By adopting the above technical solution, the process of the fine bar material leaving the conveyor belt and entering the drop plate is achieved through the pushing space formed between the positioning block and the pushing block, and the state of the fine bar material remains stable.
[0021] Optionally, the push block is provided with a side plate on the side facing the direction from which the thin bar material is conveyed. When the push block moves toward the discharge plate, it causes the side plate to move above the conveyor belt and obstruct the thin bar material.
[0022] By adopting the above technical solution, the side plate moves together with the push block when it moves. The side plate moves onto the conveyor belt and blocks the subsequent fine bar material. When the push block is reset, the fine bar material continues to be conveyed. At the same time, even when the width of the push block is small, the fine bar material will not get stuck between the push block and the push cylinder when the push block is reset.
[0023] In summary, the conveying assembly continuously delivers the thin bars to the discharge plate. The thin bars enter the guide hopper through the discharge holes on the discharge plate. Due to the narrow width at both ends of the discharge holes, the thin bars always fall into the guide hopper with the smaller diameter end first. This ensures that the thin bars output from the guide hopper always have the smaller diameter end first. After entering the reversing sleeve, the reversing drive unit rotates the reversing sleeve, causing the thin bars in the reversing groove to fall out of the reversing groove again. During this process, the orientation of the thin bars is changed, so that the larger diameter end of the thin bars continues to be conveyed as the leading end. Ultimately, this achieves a reversible feeding process where the larger diameter end of the thin bars acts as the head. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the fine bar stock in this application.
[0025] Figure 2 This is a schematic diagram of the feeding mechanism in the embodiments of this application.
[0026] Figure 3 This is a schematic diagram of the cooperative structure of the orientation component and the conveying component in the embodiments of this application.
[0027] Figure 4 This is a schematic diagram of the structure of the end of the conveyor belt in an embodiment of this application.
[0028] Figure 5 This is a schematic diagram of the recognition component in the embodiments of this application.
[0029] Figure 6 This is a schematic diagram of the installation structure of the components on the associated plate in the embodiments of this application.
[0030] Figure 7 This is a schematic diagram of the installation structure of the reversing sleeve according to another embodiment of this application.
[0031] Explanation of reference numerals in the attached drawings: 1. Conveying assembly; 2. Direction recognition assembly; 21. Connecting plate; 22. Reversing sleeve; 221. Reversing groove; 222. Positioning laser hole; 23. Receiving sleeve; 231. Output laser hole; 24. Reversing drive component; 25. Sealing block; 26. Conveying pipe; 3. Bar stock elevator; 4. Conveyor belt; 41. Positioning block; 411. Wave groove; 42. Push cylinder; 43. Pushing block; 431. Wave protrusion; 44. Alignment block; 45. Pushing space; 46. Side plate; 5. Pressure sensor; 6. Drop plate; 61. Drop hole; 7. Guide hopper; 71. Bottom plate; 72. Edge plate; 73. Sealing plate; 74. Guide space; 81. First laser sensor switch; 82. Second laser sensor switch; 9. Arc-shaped sealing plate; 10. Thin bar stock. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 2-7 This application will be described in further detail.
[0033] This application discloses a fine bar feeding mechanism.
[0034] Reference Figure 2 A fine bar material orientation feeding mechanism includes a conveying component 1 and an orientation component 2. The conveying component 1 feeds the fine bars 10 one by one into the orientation component 2. The orientation component 2 adjusts the orientation of the fine bars 10 so that all the fine bars 10 are output with their larger ends as the head.
[0035] Reference Figure 2 and Figure 3 The conveying assembly 1 includes a bar stock elevator 3, a conveyor belt 4, a positioning block 41, a side plate 46, a pushing cylinder 42, and a pushing block 43. The structure of the bar stock elevator 3 can refer to existing elevators, and will not be described in detail here. The feeding end of the conveyor belt 4 is located at the top discharge position of the bar stock elevator 3. The conveyor belt 4 feeds horizontally. The positioning block 41 and the pushing cylinder 42 are installed at the unloading end of the conveyor belt 4. In this embodiment, the conveyor belt 4 is a circular belt type, including two parallel circular belts, and a groove is formed between the two circular belts for the thin bar stock 10 to fall into. The thin bar stock 10 moves together with the two circular belts between them, so as to achieve the purpose of conveying the thin bar stock 10 one by one. The conveyor belt 4 is provided with limiting structures on both sides of the two circular belts to restrict the thin bar stock 10 from falling out until the pushing block 43, and is spaced a certain distance from the pushing block 43.
[0036] Reference Figure 3 and Figure 4The push cylinder 42 is mounted on the support of the conveyor belt 4, and the direction of movement of the piston rod of the push cylinder 42 is perpendicular to the conveying direction of the conveyor belt 4. The push block 43 is mounted on the push cylinder 42, and the push cylinder 42 drives the push block 43 to reciprocate across the running trajectory of the thin bar material 10 on the conveyor belt 4. The positioning block 41 and the side plate 46 are both mounted on the push block 43 and located on both sides of the push block 43. The thin bar material 10 is transported along the side plate 46 to the positioning block 41. The push cylinder 42 does not drive the push block 43. When extended, the positioning block 41 is located above the running trajectory of the thin bar 10 on the conveyor belt 4. The upper side of the positioning block 41 is rotatably connected to the push block 43. At the same time, the positioning block 41 is provided with a wave groove 411, and the push block 43 is provided with a wave protrusion 431 located in the wave groove 411, so that the positioning block 41 can wave slightly under the push of the thin bar 10. The push block 43 is also provided with a pressure sensor 5 to detect the positioning block 41, thereby detecting whether the thin bar 10 has reached the designated position and abutted the positioning block 41.
[0037] An alignment block 44 is also installed on the end face of the push block 43 facing the thin bar 10. The push block 43 and the alignment block 44 are spaced apart. The upper parts of the push block 43 and the alignment block 44 are connected by angle steel screws. A pushing space 45 for the thin bar 10 to enter is formed between the push block 43 and the alignment block 44. The alignment block 44 blocks the outlet of the pushing space 45, preventing the thin bar 10 from continuing to run out of the pushing space 45.
[0038] The side wall of the push block 43 has a notch for the installation of the side plate 46, so that the side plate 46 is flush with the side wall of the push block 43. When the push block 43 moves to the limit under the drive of the push cylinder 42, the side plate 46 is above the running trajectory of the thin bar 10 on the conveyor belt 4. At the same time, when the thin bar 10 abuts against the positioning block 41 and reaches the designated position, the end part of the thin bar 10 protrudes from the side plate 46, so that when the push block 43 is reset, the next thin bar 10 can smoothly continue to enter the pushing space 45.
[0039] Reference Figure 4-6The orientation component 2 includes a discharge plate 6, a guide hopper 7, an association plate 21, a reversing sleeve 22, a receiving sleeve 23, and a reversing drive component 24. The discharge plate 6 and the push block 43 are located on opposite sides of the conveyor belt 4 in the conveying direction. The push cylinder 42 drives the push block 43 to move towards the discharge plate 6 until the pushing space 45 reaches above the discharge plate 6, causing the thin bar 10 to fall onto the discharge plate 6. The discharge plate 6 has a vertical discharge hole 61 for the thin bar 10 to pass through. The width of the middle of the discharge hole 61 is greater than the larger diameter of the thin bar 10. The width of the two ends of the hole 61 is between the larger and smaller diameters of the thin bar 10. The length of the larger part of the middle width of the dropping hole 61 is less than the length of the thin bar 10, so that both ends of the thin bar 10 are located at the two ends of the smaller width of the dropping hole 61. The end of the thin bar 10 with a larger diameter is restricted by the dropping hole 61, while the end of the thin bar 10 with a smaller diameter falls smoothly through the dropping hole 61, thereby driving the end of the thin bar 10 with a larger diameter to also pass through the dropping hole 61. The thin bar 10 falls with the end of the thin bar 10 with the smaller diameter facing downwards.
[0040] The aforementioned discharge plate 6 is suspended and mounted on the support of the conveyor belt 4, while the guide bucket 7 is also mounted on the support of the conveyor belt 4 and located below the discharge plate 6. In this embodiment, the discharge plate 6 and the guide bucket 7 are integrated as one unit. Specifically, the guide bucket 7 includes a bottom plate 71, an edge plate 72, and a sealing plate 73. The upper and lower parts of the bottom plate 71 are both square, and the width of the upper part of the bottom plate 71 is greater than the width of the lower part. The width of the upper part of the bottom plate 71 is adapted to the length of the discharge hole 61, while the width of the lower part of the bottom plate 71 is adapted to the larger diameter of the thin bar stock 10. The bottom plate 71 is shaped like an inverted isosceles trapezoid in the middle and bends away from the conveyor belt 4. There are two edge plates 72, which are installed on both sides of the bottom plate 71 and extend along the edges of the bottom plate 71. The sealing plate 73 is installed on the two edge plates 72. Finally, the guide bucket 7 forms a guide space 74 with openings at the top and bottom. The guide space 74 receives the thin bar material 10 falling from the discharge hole 61 and outputs it again from the bottom. The discharge plate 6 is fixed between the bottom plate 71 and the sealing plate 73 and abuts against the edge plate 72.
[0041] The upper part of the connecting plate 21 is fixedly mounted on the side wall of the base plate 71 away from the sealing plate 73 for the installation of the reversing sleeve 22 and the receiving sleeve 23. The reversing sleeve 22 is located below the guide bucket 7 and is fixedly mounted on the connecting plate 21 through the reversing drive component 24. Specifically, in this embodiment, the reversing drive component 24 is a rotary cylinder and is installed on the side of the connecting plate 21 away from the reversing sleeve 22. The reversing block of the reversing drive component 24 passes through the connecting plate 21 and is installed for the reversing sleeve 22. The reversing sleeve 22 is a quadrangular prism and has a hole with a diameter larger than the larger diameter of the thin bar 10 along its length. One end of the hole on the reversing sleeve 22 is sealed with a sealing block 25 to form a reversing groove 221 with one end open. In order to prevent the thin bar 10 from easily emerging from the reversing groove 221 during the rotation of the reversing sleeve 22, the depth of the reversing groove 221 is greater than the length of the thin bar 10 to reserve a certain sliding stroke.
[0042] The end of the connecting plate 21 away from the guide bucket 7 is used for the installation of the receiving sleeve 23, and the receiving sleeve 23 is located on the side of the reversing sleeve 22 away from the guide bucket 7. The receiving sleeve 23 is also in the shape of a quadrangular prism and has a hole that runs through the top and bottom. The receiving sleeve 23 receives the fine bar material 10 output through the reversing groove 221 after the reversing sleeve 22 rotates. A conveying pipe 26 is provided on the side of the receiving sleeve 23 away from the reversing sleeve 22.
[0043] The orientation component 2 also includes two sets of laser sensor switches mounted on the associated plate 21. The two sets of laser sensor switches are respectively designated as a first laser sensor switch 81 and a second laser sensor switch 82. The first laser sensor switch 81 is located on the side of the reversing sleeve 22. The reversing sleeve 22 has a positioning laser hole 222 that passes through the reversing groove 221 for the laser to pass through.
[0044] The second laser sensor switch 82 is located on the side of the receiving sleeve 23, which has an output laser hole 231 that passes through the internal space to allow the laser to pass through.
[0045] Two sets of laser sensor switches are used to detect whether there is a thin bar 10 in the reversing sleeve 22 and whether the thin bar 10 has passed through the receiving sleeve 23.
[0046] In another embodiment, refer to Figure 7Two reversing sleeves 22 can also be provided. The closed ends of the two reversing sleeves 22 are sealed by the same sealing block 25. The openings of the reversing grooves 221 of the two reversing sleeves 22 face opposite directions, so that the reversal of one thin bar 10 is completed every 180 degrees of rotation without the need to reset the reversing sleeve 22. In order to prevent the thin bar 10 from easily falling off during the rotation of the reversing sleeve 22, and at the same time, the length of the reversing sleeve 22 is not too long, a magnet is provided at the bottom of the reversing groove 221. In this embodiment, the sealing block 25 can be a magnet. At the same time, the magnetic force of the magnet cannot attract the gravity of the thin bar 10 after the rotation and reversal are completed, so as not to affect the normal output of the thin bar 10. Alternatively, an arc-shaped sealing plate 9 can be provided on the associated plate 21 to restrict the thin bar 10 from falling off the reversing sleeve 22.
[0047] The aforementioned reversing sleeve 22 can also be a single unit, with the sealing block 25 being inserted into the reversing sleeve 22 from the side wall in the middle of the reversing sleeve 22 as a whole, thereby dividing the space inside the reversing sleeve 22 into two reversing slots 221; at the same time, the aforementioned arc-shaped sealing plate 9 and magnet structure can also be applied to an embodiment with only one reversing slot 221.
[0048] The implementation principle of the thin bar feeding mechanism in this application embodiment is as follows: the bar elevator 3 continuously lifts the thin bar 10 to the conveyor belt 4, the conveyor belt 4 delivers the thin bar 10 to the push block 43, and the push cylinder 42 drives the push block 43 to push the thin bar 10 above the drop plate 6. The thin bar 10 enters the guide hopper 7 through the drop hole 61 on the drop plate 6. Because the width of both ends of the drop hole 61 is small, the thin bar 10 always falls into the guide hopper 7 with the smaller diameter end first. This ensures that the smaller diameter end of the thin bar 10 output from the guide bucket 7 goes first. After the thin bar 10 enters the reversing sleeve 22, the reversing drive 24 drives the reversing sleeve 22 to rotate, causing the thin bar 10 in the reversing groove 221 to fall out of the reversing groove 221 again. During this process, the orientation of the thin bar 10 is changed, so that the larger diameter end of the thin bar 10 is used as the leading end for continued conveying, and finally the larger diameter end of the thin bar 10 is used as the head for the orientation feeding process.
[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A fine bar feeding mechanism, characterized in that: The assembly includes a conveying component (1) and a reversing component (2). The reversing component (2) includes a discharge plate (6), a guide bucket (7), a reversing sleeve (22), and a reversing drive (24). The conveying component (1) transports the thin bar stock (10) to the discharge plate (6). The discharge plate (6) has a discharge hole (61) for the thin bar stock (10) to pass through. The width of the middle of the discharge hole (61) is greater than the larger diameter of the thin bar stock (10). The widths at both ends of the discharge hole (61) are between the larger and smaller diameters of the thin bar stock (10). The middle of the discharge hole (61) is... The length of the wider portion is less than the length of the thin bar (10). The guide bucket (7) is located below the dropping hole (61) and receives the falling thin bar (10). The guide bucket (7) has a guide space (74) for the thin bar to pass through. The guide space (74) is larger at the top and smaller at the bottom, and the bottom is long and open for the output of the thin bar. The reversing sleeve (22) is located below the guide bucket (7) and has a reversing groove (221) for receiving the thin bar output from the guide space (74). The reversing drive (24) drives the reversing sleeve (22) to rotate.
2. The thin bar feeding mechanism according to claim 1, characterized in that: The orientation component (2) further includes a first laser sensor switch (81), which is located on the side of the reversing sleeve (22). The reversing sleeve (22) has a positioning laser hole (222) that passes through the reversing groove (221) for the laser to pass through.
3. The thin bar feeding mechanism according to claim 1, characterized in that: The orientation component (2) also includes a receiving sleeve (23), which is located on the side of the reversing sleeve (22) away from the guide bucket (7). The receiving sleeve (23) is vertically connected and receives the fine bar material (10) output by the reversing sleeve (22). A conveying pipe (26) is provided on the side of the receiving sleeve (23) away from the reversing sleeve (22).
4. The thin bar feeding mechanism according to claim 3, characterized in that: The orientation component (2) also includes a second laser sensor switch (82), which is located on the side of the receiving sleeve (23). The receiving sleeve (23) has an output laser hole (231) that passes through the internal space for the laser to pass through.
5. The thin bar feeding mechanism according to claim 3, characterized in that: The orientation component (2) also includes an association plate (21), one end of which is fixed to the guide bucket (7), and the other end is for the receiving sleeve (23) to be installed. The reversing drive component (24) is installed in the middle of the association plate (21) and the reversing sleeve (22) is installed thereon.
6. The thin bar feeding mechanism according to claim 1, characterized in that: The conveying assembly (1) includes a conveyor belt (4), a positioning block (41), a pushing cylinder (42), and a pushing block (43). The pushing block (43) and the dropping plate (6) are respectively located on both sides of the conveying direction of the conveyor belt (4). The positioning block (41) is set on the conveyor belt (4) and prevents the thin bar (10) from continuing to move after reaching the position corresponding to the dropping plate (6). The pushing cylinder (42) drives the pushing block (43) to move towards the dropping plate (6).
7. The thin bar feeding mechanism according to claim 6, characterized in that: The conveying assembly (1) also includes a positioning block (44), the upper part of the pushing block (43) and the positioning block (44) are connected, and a pushing space (45) for the fine bar stock (10) to enter is formed between the lower part of the pushing block (43) and the positioning block (44).
8. The thin bar feeding mechanism according to claim 6, characterized in that: The push block (43) has a side plate (46) on the side facing the direction of the thin bar (10). When the push block (43) moves toward the drop plate (6), it drives the side plate (46) to move above the conveyor belt (4) and obstructs the thin bar (10).