Sound processing device and processing method thereof

Abstract

The invention discloses a sound processing device and a processing method thereof, and relates to the technical field of sound processing.The sound processing device comprises a fixing plate and a base, a first center shaft is fixedly arranged on the upper surface of the fixing plate, a connecting rod is rotatably arranged on the first center shaft, a fixing table is fixedly arranged at one end of the connecting rod, and a fixing frame is fixedly arranged on the upper surface of the fixing table; a rotating frame is rotatably arranged on the inner side of the fixing frame, a placement table is fixedly arranged at the upper end of the rotating frame, a sound storage device is arranged on the placement table, a moving mechanism is arranged on the fixing plate, and an adjusting mechanism is arranged on the fixing plate; when the sound storage device is used, the position can be adjusted through transverse movement, the sound storage device can be moved to the front of each person, the angle can be adjusted through vertical movement, sound can be completely collected, and due to the fact that equipment is mechanically controlled, the phenomenon that the sound storage device fails to adjust or is loosened in the long-time use process is avoided; the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of sound processing, and in particular to a sound processing device and a processing method thereof. Background Art

[0002] Audio processing is an audio processing device that we often use when using many large electronic devices. At present, a sound receiving device is needed to collect the sound. When using it, the position and angle of the sound receiving device should be adjusted to process the sound and better collect the sound so that the viewer can hear it more clearly.

[0003] At present, the sound processing device has the following disadvantages: 1. The sound collection device needs to be supported by a bracket. When two people use it together, they need to manually adjust the position of the bracket and the angle of the sound processing device on the bracket to ensure that the voices of both people are clear. This requires a lot of time and energy to adjust the position, which reduces the efficiency of sound processing; 2. If the angle of the sound collection device is constantly adjusted, it will cause the sound collection device and the bracket to loosen over a long period of time, resulting in deviations in sound collection. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art that it is inconvenient to adjust the position and angle of the sound receiving device and that frequent adjustment may cause the sound receiving device to become loose, and to propose a sound processing device.

[0005] In order to solve the problems in the prior art of inconvenience in adjusting the position and angle of the sound collecting device and the loosening of the sound collecting device caused by frequent adjustment, the present invention adopts the following technical solution:

[0006] A sound processing device comprises a fixed plate and a base, wherein a first central axis is fixedly provided on the upper surface of the fixed plate, a connecting rod is rotatably provided on the first central axis, a fixed platform is fixedly provided at one end of the connecting rod, a fixed frame is fixedly provided on the upper surface of the fixed platform, a rotating frame is rotatably provided inside the fixed frame, a placing platform is fixedly provided on the upper end of the rotating frame, a sound collecting device is provided on the placing platform, a moving mechanism is provided on the fixed plate, and an adjusting mechanism is provided on the fixed plate.

[0007] Preferably, the moving mechanism includes a mounting block, which is rotatably connected to the upper surface of the fixed plate, a cylinder is fixedly provided on the mounting block, a connecting sleeve is provided on the output end of the cylinder, a second center axis is fixedly provided on the upper surface of the fixed plate, a first rotating rod is rotatably provided on the second center axis, one end of the first rotating rod is rotatably connected to the lower end of the connecting sleeve, and the other end of the first rotating rod is slidably connected to the connecting rod.

[0008] Preferably, the adjusting mechanism includes a rotating shaft, the rotating shaft is rotatably connected to the fixed frame, the rotating shaft is fixedly connected to the rotating frame, a worm gear is fixedly arranged at one end of the rotating shaft, a fixing rod is fixedly arranged at the outer side of the fixed frame, a worm is rotatably arranged on the fixing rod, the worm is meshed with the worm wheel, a gear is fixedly arranged at the lower end of the worm, a support rod is slidably provided on the fixing plate, a toothed plate is fixedly arranged at one end of the support rod, and the toothed plate is meshed with the gear.

[0009] Preferably, a movable groove is provided on the upper surface of the placement table, a pair of movable blocks are slidably provided in the movable groove, a clamping block is fixedly provided at the upper end of the movable block, a bidirectional screw is rotatably provided in the movable groove, the bidirectional screw is threadedly connected to the movable block, and a rotating handle is fixedly provided at one end of the bidirectional screw.

[0010] Preferably, a fixed column is fixedly provided on the upper surface of the base, a movable column is slidably provided inside the fixed column, the upper end of the movable column is fixedly connected to the lower surface of the fixed plate, a bolt is threaded on the fixed column, and one end of the bolt is in contact with the outer wall of the movable column.

[0011] Preferably, a support block is fixedly provided on the upper surface of the fixing plate, a first protective plate is fixedly provided on the upper surface of the supporting block, and a second protective plate is fixedly provided on one side of the fixing plate.

[0012] Preferably, a fixing block is fixedly provided on one side of the fixing plate, a baffle is slidably provided on the inner wall of the fixing block, a limiting spring is fixedly provided on the lower end of the baffle, and the lower end of the limiting spring is fixedly connected to the inner wall of the fixing block.

[0013] Preferably, the support rod passes through the fixing plate, one end of the support rod close to the baffle is rectangular, and a small spring is sleeved on the support rod.

[0014] Preferably, the first central axis is located at the end of the connecting rod, and the second central axis is located close to the connecting sleeve.

[0015] The present invention also provides a processing method of a sound processing device, comprising the following steps:

[0016] Step 1: After placing the base in a suitable position, move the movable column upwards, adjust the height of the movable column, turn the bolt to fix the position of the movable column, and determine the height of the sound collection device;

[0017] Step 2: Place the lower end of the sound receiving device on the placement table, rotate the rotating handle to drive the bidirectional screw to rotate, the bidirectional screw drives the moving block to move along the moving groove, the moving block drives the clamping block to move inward, the clamping block contacts the outer wall of the sound receiving device, and the position of the sound receiving device is fixed;

[0018] Step three, when it is necessary to collect the voices of two people, the connecting sleeve can be driven by the output end of the cylinder, the connecting sleeve drives the end of the first rotating rod to move, the first rotating rod rotates along the second central axis, the first rotating rod drives the connecting rod to rotate, the connecting rod rotates along the first central axis, and drives the fixed platform to move, so that the sound collecting device moves to the front of the other person to collect the voice of the other person;

[0019] Step four, when it is necessary to adjust the angle of the sound receiving device, the baffle is pushed upward by the elastic force of the limit spring, and the support rod extending from one side of the fixed plate is blocked in the fixed plate, so that the tooth plate and the gear are meshed, and when the connecting rod drives the fixed platform to move, the fixed frame on the fixed platform moves synchronously, and the fixed frame drives the worm to move, and the gear at the lower end of the worm rotates along the tooth plate, thereby causing the worm to rotate, and the worm drives the worm wheel to rotate, the worm wheel drives the rotating shaft to rotate, and the rotating shaft drives the rotating frame to rotate, and the rotating frame drives the sound receiving device on the platform to rotate, thereby realizing the angle adjustment of the sound receiving device. When no adjustment is required, when the connecting rod drives the fixed platform to move, you only need to press the baffle so that one end of the support rod passes through the fixed plate, and the tooth plate at the other end cannot mesh with the gear.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, by controlling the mechanical control, the moving mechanism drives the sound collecting device to move horizontally and adjust the position, and the adjusting mechanism makes the sound collecting device move vertically along the fixed platform and adjust the angle, so that multiple sounds can be collected and the sound clarity can be improved;

[0022] 2. In the present invention, the baffle is used as a control switch to control whether the sound receiving device needs to be adjusted in angle, so that the sound receiving device and the bracket below will not fail or become loose due to long-term use, thereby improving the service life of the device;

[0023] In summary, when using the sound collecting device of the present invention, the position can be adjusted by lateral movement so that the sound collecting device can be moved in front of each person, and the angle can be adjusted by vertical movement to completely collect the sound. Since the equipment is mechanically controlled, the sound collecting device will not fail to adjust or become loose during long-term use, thereby increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1It is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the mobile mechanism of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the regulating mechanism of the present invention;

[0028] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0029] Figure 5 It is a schematic diagram of the structure of the fixing block of the present invention;

[0030] Figure 6 It is a schematic diagram of the cooperation between the support rod and the baffle of the present invention;

[0031] Figure 7 It is a preparation method diagram of the present invention;

[0032] Serial numbers in the figure: 1. fixed plate; 11. first central axis; 12. connecting rod; 13. fixed platform; 14. fixed frame; 15. rotating frame; 16. placing platform; 17. sound collecting device; 2. moving mechanism; 21. mounting block; 22. cylinder; 23. connecting sleeve; 24. second central axis; 25. first rotating rod; 3. adjusting mechanism; 31. rotating shaft; 32. worm gear; 33. fixed rod; 34. worm; 35. gear; 36. support rod; 37. tooth plate; 38. small spring; 4. moving groove; 41. bidirectional screw; 42. moving block; 43. rotating handle; 44. clamping block; 5. base; 51. fixed column; 52. moving column; 53. bolt; 6. support block; 61. first protective plate; 62. second protective plate; 7. fixed block; 71. baffle; 72. limit spring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Embodiment 1: This embodiment provides a sound processing device, see Figure 1-7Specifically, it includes a fixed plate 1 and a base 5. A first central axis 11 is fixedly provided on the upper surface of the fixed plate 1. A connecting rod 12 is rotatably provided on the first central axis 11. A fixed platform 13 is fixedly provided at one end of the connecting rod 12. A fixed frame 14 is fixedly provided on the upper surface of the fixed platform 13. A rotating frame 15 is rotatably provided inside the fixed frame 14. A placing platform 16 is fixedly provided on the upper end of the rotating frame 15. A sound receiving device 17 is provided on the placing platform 16. A moving mechanism 2 is provided on the fixed plate 1. An adjusting mechanism 3 is provided on the fixed plate 1. The sound receiving device 17 includes some input devices such as a microphone.

[0035] In the specific implementation process, Figure 3 and Figure 4 As shown, the moving mechanism 2 includes a mounting block 21, which is rotatably connected to the upper surface of the fixed plate 1, a cylinder 22 is fixedly provided on the mounting block 21, a connecting sleeve 23 is sleeved on the output end of the cylinder 22, a second central axis 24 is fixedly provided on the upper surface of the fixed plate 1, a first rotating rod 25 is rotatably provided on the second central axis 24, one end of the first rotating rod 25 is rotatably connected to the lower end of the connecting sleeve 23, a lower protrusion at the other end of the first rotating rod 25 is slidably connected to the concave long strip slide groove on the connecting rod 12, the first central axis 11 is located at the end position of the connecting rod 12, the second central axis 24 is located near the connecting sleeve 23, the connecting sleeve 23 is driven by the output end of the cylinder 22, the connecting sleeve 23 drives the end of the first rotating rod 25 to move, the first rotating rod 25 rotates along the second central axis 24, the first rotating rod 25 drives the connecting rod 12 to rotate, the connecting rod 12 rotates along the first central axis 11, and drives the fixed platform 13 to move for the convenience of collecting the sound;

[0036] The adjusting mechanism 3 includes a rotating shaft 31, which is rotatably connected to the fixing frame 14, and is fixedly connected to the rotating frame 15. A worm gear 32 is fixedly arranged at one end of the rotating shaft 31, and a fixing rod 33 is fixedly arranged at the outer side of the fixing frame 14. A worm 34 is rotatably arranged on the fixing rod 33, and the worm 34 is meshed with the worm gear 32. A gear 35 is fixedly arranged at the lower end of the worm 34. A support rod 36 is slidably arranged on the fixing plate 1, and a toothed plate 37 is fixedly arranged at one end of the support rod 36, and the toothed plate 37 is meshed with the gear 35. The support rod 36 passes through the fixing plate 1, and the end of the support rod 36 close to the baffle 71 is rectangular in shape. A small spring 38 is sleeved on the support rod 36. When the connecting rod 12 drives the fixed platform 13 to move, the fixed frame 14 on the fixed platform 13 moves synchronously, and the fixed frame 14 drives the worm 34 to move. The gear 35 at the lower end of the worm 34 rotates along the tooth plate 37, so that the worm 34 rotates, and the worm 34 drives the worm wheel 32 to rotate, and the worm wheel 32 drives the rotating shaft 31 to rotate, and the rotating shaft 31 drives the rotating frame 15 to rotate, and the rotating frame 15 drives the sound collection device 17 on the placement table 16 to rotate, thereby realizing the angle adjustment of the sound collection device 17 and improving the collection flexibility.

[0037] In the specific implementation process, Figure 4 and Figure 5 As shown, a movable groove 4 is opened on the upper surface of the placement table 16, and a pair of movable blocks 42 are slidably provided in the movable groove 4, and a clamping block 44 is fixedly provided on the upper end of the movable block 42, and a bidirectional screw 41 is rotatably provided in the movable groove 4, and the bidirectional screw 41 is threadedly connected with the movable block 42, and a rotating handle 43 is fixedly provided at one end of the bidirectional screw 41, and the bidirectional screw 41 is driven to rotate by rotating the rotating handle 43, and the bidirectional screw 41 drives the movable block 42 to move along the movable groove 4, and the movable block 42 drives the clamping block 44 to move toward the center, and the clamping block 44 contacts the outer wall of the sound receiving device 17 to fix the position of the sound receiving device 17.

[0038] In the specific implementation process, Figure 1 and Figure 2 As shown, a fixed column 51 is fixedly provided on the upper surface of the base 5, and a movable column 52 is slidably provided inside the fixed column 51. The upper end of the movable column 52 is fixedly connected to the lower surface of the fixed plate 1, and a bolt 53 is threadedly provided on the fixed column 51. One end of the bolt 53 is in contact with the outer wall of the movable column 52. The movable column 52 is moved upward to adjust the height of the movable column 52. The bolt 53 is rotated to fix the position of the movable column 52 to determine the height of the sound collecting device 17.

[0039] In the specific implementation process, Figure 1 and Figure 2 As shown, a support block 6 is fixedly provided on the upper surface of the fixed plate 1, a first protective plate 61 is fixedly provided on the upper surface of the support block 6, and a second protective plate 62 is fixedly provided on one side of the fixed plate 1 to protect the running parts.

[0040] Embodiment 2: In embodiment 1, there is still a problem that the microphone and the bracket become loose due to frequent adjustments. Therefore, based on embodiment 1, this embodiment further includes:

[0041] In the specific implementation process, Figure 1 and Figure 6 As shown, a fixed block 7 is fixedly provided on one side of the fixed plate 1, and a baffle 71 is slidably provided on the inner wall of the fixed block 7. A limit spring 72 is fixedly provided on the lower end of the baffle 71, and the lower end of the limit spring 72 is fixedly connected to the inner wall of the fixed block 7. The baffle 71 is pushed upward by the elastic force of the limit spring 72, and the support rod 36 extending from one side of the fixed plate 1 is blocked in the fixed plate 1, so that the tooth plate 37 is meshed with the gear 35, thereby realizing the control of the adjustment angle.

[0042] Example 3: See Figure 7 Specifically, the working principle and operation method of the present invention are as follows:

[0043] Step 1: After placing the base 5 in a suitable position, move the movable column 52 upward, adjust the height of the movable column 52, and turn the bolt 53 to fix the position of the movable column 52 to determine the height of the sound receiving device 17;

[0044] Step 2: Place the lower end of the sound receiving device 17 on the placement table 16, and rotate the rotating handle 43 to drive the bidirectional screw 41 to rotate. The bidirectional screw 41 drives the moving block 42 to move along the moving groove 4, and the moving block 42 drives the clamping block 44 to move inward. The clamping block 44 contacts the outer wall of the sound receiving device 17 to fix the position of the sound receiving device 17;

[0045] Step three, when it is necessary to collect the voices of two people, the connecting sleeve 23 can be driven by the output end of the cylinder 22, and the connecting sleeve 23 drives the end of the first rotating rod 25 to move, and the first rotating rod 25 rotates along the second central axis 24, and the first rotating rod 25 drives the connecting rod 12 to rotate, and the connecting rod 12 rotates along the first central axis 11, driving the fixed platform 13 to move, so that the sound collecting device 17 moves to the front of the other person to collect the voice of the other person;

[0046] Step 4, when the angle of the sound receiving device 17 needs to be adjusted, the baffle plate 71 is pushed upward by the elastic force of the limit spring 72, and the support rod 36 extending from one side of the fixing plate 1 is blocked in the fixing plate 1, so that the tooth plate 37 is meshed with the gear 35. When the connecting rod 12 drives the fixing platform 13 to move, the fixing frame 14 on the fixing platform 13 moves synchronously, and the fixing frame 14 drives the worm 34 to move, and the gear 35 at the lower end of the worm 34 rotates along the tooth plate 37, thereby causing the worm 34 to rotate. The worm 34 drives the worm wheel 32 to rotate, the worm wheel 32 drives the rotating shaft 31 to rotate, the rotating shaft 31 drives the rotating frame 15 to rotate, and the rotating frame 15 drives the sound receiving device 17 on the placement table 16 to rotate, so as to adjust the angle of the sound receiving device 17. When no adjustment is needed, when the connecting rod 12 drives the fixed table 13 to move, it is only necessary to press the baffle 71 so that one end of the support rod 36 passes through the fixed plate 1, and the toothed plate 37 at the other end cannot mesh with the gear 35.

[0047] When using the sound collecting device of the present invention, the position can be adjusted by lateral movement so that the sound collecting device can be moved in front of each person, and the angle can be adjusted by vertical movement to completely collect the sound. Since the equipment is mechanically controlled, the sound collecting device will not fail to adjust or become loose during long-term use, thereby increasing the service life of the equipment.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sound processing device, comprising a fixing plate (1) and a base (5), characterized in that: A first central axis (11) is fixedly provided on the upper surface of the fixed plate (1), a connecting rod (12) is rotatably provided on the first central axis (11), a fixed platform (13) is fixedly provided at one end of the connecting rod (12), a fixed frame (14) is fixedly provided on the upper surface of the fixed platform (13), a rotating frame (15) is rotatably provided inside the fixed frame (14), a placing platform (16) is fixedly provided on the upper end of the rotating frame (15), a sound receiving device (17) is provided on the placing platform (16), a moving mechanism (2) is provided on the fixed plate (1), and an adjusting mechanism (3) is provided on the fixed plate (1).

2. A sound processing device according to claim 1, characterized in that: The moving mechanism (2) comprises a mounting block (21), the mounting block (21) being rotatably connected to the upper surface of the fixed plate (1), a cylinder (22) being fixedly provided on the mounting block (21), a connecting sleeve (23) being sleeved on the output end of the cylinder (22), a second central axis (24) being fixedly provided on the upper surface of the fixed plate (1), a first rotating rod (25) being rotatably provided on the second central axis (24), one end of the first rotating rod (25) being rotatably connected to the lower end of the connecting sleeve (23), and the other end of the first rotating rod (25) being slidably connected to the connecting rod (12).

3. A sound processing device according to claim 1, characterized in that: The adjusting mechanism (3) comprises a rotating shaft (31), the rotating shaft (31) is rotatably connected to the fixed frame (14), the rotating shaft (31) is fixedly connected to the rotating frame (15), a worm gear (32) is fixedly arranged at one end of the rotating shaft (31), a fixing rod (33) is fixedly arranged on the outer side of the fixed frame (14), a worm (34) is rotatably arranged on the fixing rod (33), the worm (34) is meshed with the worm gear (32), a gear (35) is fixedly arranged at the lower end of the worm (34), a support rod (36) is slidably arranged on the fixed plate (1), a toothed plate (37) is fixedly arranged at one end of the support rod (36), and the toothed plate (37) is meshed with the gear (35).

4. A sound processing device according to claim 1, characterized in that: A movable groove (4) is provided on the upper surface of the placing platform (16), a pair of movable blocks (42) are slidably provided in the movable groove (4), a clamping block (44) is fixedly provided at the upper end of the movable block (42), a bidirectional screw (41) is rotatably provided in the movable groove (4), the bidirectional screw (41) is threadedly connected to the movable block (42), and a rotating handle (43) is fixedly provided at one end of the bidirectional screw (41).

5. A sound processing device according to claim 1, characterized in that: A fixed column (51) is fixedly provided on the upper surface of the base (5), a movable column (52) is slidably provided inside the fixed column (51), the upper end of the movable column (52) is fixedly connected to the lower surface of the fixed plate (1), a bolt (53) is threadedly provided on the fixed column (51), and one end of the bolt (53) is in contact with the outer wall of the movable column (52).

6. A sound processing device according to claim 1, characterized in that: A support block (6) is fixedly provided on the upper surface of the fixed plate (1), a first protective plate (61) is fixedly provided on the upper surface of the support block (6), and a second protective plate (62) is fixedly provided on one side of the fixed plate (1).

7. A sound processing device according to claim 1, characterized in that: A fixing block (7) is fixedly provided on one side of the fixing plate (1), a baffle (71) is slidably provided on the inner wall of the fixing block (7), a limit spring (72) is fixedly provided at the lower end of the baffle (71), and the lower end of the limit spring (72) is fixedly connected to the inner wall of the fixing block (7).

8. A sound processing device according to claim 3, characterized in that: The support rod (36) passes through the fixed plate (1); one end of the support rod (36) close to the baffle (71) is in a rectangular shape; a small spring (38) is sleeved on the support rod (36).

9. A sound processing device according to claim 2, characterized in that: The first central axis (11) is located at the end of the connecting rod (12), and the second central axis (24) is located close to the connecting sleeve (23).

10. A processing method for a sound processing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: After placing the base (5) in a suitable position, move the movable column (52) upward, adjust the height of the movable column (52), turn the bolt (53) to fix the position of the movable column (52), and determine the height of the sound receiving device (17); Step 2: Place the lower end of the sound receiving device (17) on the placement table (16), rotate the rotating handle (43) to drive the bidirectional screw (41) to rotate, the bidirectional screw (41) drives the moving block (42) to move along the moving groove (4), the moving block (42) drives the clamping block (44) to move inward, the clamping block (44) contacts the outer wall of the sound receiving device (17), and the position of the sound receiving device (17) is fixed. Step 3, when it is necessary to collect and process the voices of two people, the connecting sleeve (23) can be driven by the output end of the cylinder (22), and the connecting sleeve (23) drives the end of the first rotating rod (25) to move, and the first rotating rod (25) rotates along the second central axis (24), and the first rotating rod (25) drives the connecting rod (12) to rotate, and the connecting rod (12) rotates along the first central axis (11), driving the fixed platform (13) to move, so that the sound collecting device (17) moves to the front of the other person, and collects the voice of the other person; Step 4: When the angle of the sound receiving device (17) needs to be adjusted, the baffle (71) is pushed upward by the elastic force of the limit spring (72), and the support rod (36) extending from one side of the fixed plate (1) is blocked inside the fixed plate (1), so that the tooth plate (37) and the gear (35) are meshed. When the connecting rod (12) drives the fixed platform (13) to move, the fixed frame (14) on the fixed platform (13) moves synchronously, and the fixed frame (14) drives the worm (34) to move, and the gear (35) at the lower end of the worm (34) rotates along the tooth plate (37), so that the worm (34) moves. The worm (34) drives the worm wheel (32) to rotate, the worm wheel (32) drives the rotating shaft (31) to rotate, the rotating shaft (31) drives the rotating frame (15) to rotate, the rotating frame (15) drives the sound receiving device (17) on the placement table (16) to rotate, so as to adjust the angle of the sound receiving device (17). When no adjustment is needed, when the connecting rod (12) drives the fixed table (13) to move, it is only necessary to press the baffle plate (71) so that one end of the support rod (36) passes through the fixed plate (1) and the toothed plate (37) at the other end cannot mesh with the gear (35).

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