Gear type adjusting device

Abstract

The utility model discloses a gear type adjusting device which comprises a fixed seat, a left swing arm and a right swing arm, and the front end of the left swing arm and the front end of the right swing arm are respectively and rotatably arranged on the fixed seat. The left swing arm and the right swing arm are arranged in a crossed manner, or extension lines of the left swing arm and the right swing arm are crossed; the device is characterized by further comprising a gear type driving mechanism, and the gear type driving mechanism is used for directly driving the rear ends of the left swing arm and the right swing arm to get close to each other or get away from each other. The gear type adjusting device not only can stably adjust the distance between two objects, but also does not need to be controlled by a stay wire, and is high in stability and long in service life during adjustment.

Description

Technical Field

[0001] The utility model relates to an adjusting buckle, in particular to a gear type adjusting device. Background Art

[0002] The sizes of clothes are generally designed according to standard human bodies. However, due to the different body shapes of each person, even for clothes such as standard-sized trousers or shoes, there will be belt loops or shoelaces provided for further adjusting the size. For the convenience of fine-tuning, there are regulators on the market that can be directly connected to bras, trouser waists, or shoelaces, etc. For example, a kind of tension regulator (the patentee is the designer of this application) disclosed on June 14, 2024, with the publication number CN221129023U, includes a fixed seat, a left swing arm, and a right swing arm. The left swing arm and the right swing arm are respectively rotatably arranged on the fixed seat; the left swing arm and the right swing arm are arranged in a cross shape, or the extension lines of the left swing arm and the right swing arm intersect; the tension regulator further includes a driving device capable of driving the adjusting ends of the left swing arm and the right swing arm to approach or move away from each other. The driving device is arranged on the fixed seat, and among them, the driving device is a cable device. Although this kind of tension regulator can better adjust the distance between two objects, because it uses a cable structure for control, not only is the assembly difficult during production, but also in actual use, its adjustment stability is insufficient, and it often gets stuck easily. At the same time, during continuous use, the cable is easily broken due to wear, and its service life is short. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a gear type adjusting device, which can not only stably adjust the distance between two objects, but also does not require cable control, has strong stability during adjustment, and has a long service life.

[0004] In order to solve the above technical problems, the following technical solutions are adopted:

[0005] A gear type adjusting device includes a fixed seat, a left swing arm, and a right swing arm. The front ends of the left swing arm and the right swing arm are respectively rotatably arranged on the fixed seat; the left swing arm and the right swing arm are arranged in a cross shape, or the extension lines of the left swing arm and the right swing arm intersect; the feature is that it further includes a gear type driving mechanism, and the gear type driving mechanism is used to directly drive the rear ends of the left swing arm and the right swing arm to approach or move away from each other.

[0006] In the above gear-type adjusting device, the left swing arm and the right swing arm are completely fixed in the length direction (such as sewing, tying, etc.) on two adjustment objects (such as two edges of a garment to be adjusted or two shoelaces, etc.). At this time, the fixed seat can also be sewn on the garment or the shoe surface without being suspended. When in use, only the gear-type driving mechanism is needed to directly drive the rear ends of the left swing arm and the right swing arm to approach or move away from each other, so as to drive the parts connected to the left swing arm and the right swing arm to approach or move away from each other, realizing the adjustment of the tightness of the connected garment. In this gear-type adjusting device, the left swing arm and the right swing arm can be directly connected to the two edges of the garment to be adjusted respectively, and the rear ends of the left swing arm and the right swing arm are directly driven by the gear-type driving mechanism to approach or move away from each other without using a wire for control, with strong stability, not easy to get stuck, long service life, and at the same time, its structure is simple and the assembly is more convenient.

[0007] In a preferred solution, the gear-type driving mechanism includes a driving knob, a driving gear, and a transmission component. The driving knob is rotatably arranged on the fixed seat, and the driving gear is installed on the driving knob; the transmission component is rotatably arranged on the fixed seat; the front end of the left swing arm is in transmission connection with the driving gear through the transmission component, the front end of the right swing arm is connected to the driving knob, or the front ends of the left swing arm and the right swing arm are respectively in transmission connection with the driving gear through the transmission component. When in use, only by rotating the driving knob, the driving gear can be rotated accordingly, and then the left swing arm and the right swing arm are driven to swing around the front end through the transmission component, so that the rear ends of the left swing arm and the right swing arm approach or move away from each other, realizing the adjustment of the tightness of the connected garment. In the above connection method, the left swing arm and the right swing arm can be replaced with each other.

[0008] In a further preferred solution, the transmission component includes a first transmission gear. The first transmission gear is rotatably arranged on the fixed seat, the first transmission gear meshes with the driving gear, and the first transmission gear is connected to the front end of the left swing arm; the front end of the right swing arm is connected to the driving knob. With this structure, when the driving knob is rotated, the right swing arm can directly swing along with the rotation of the driving knob, and the first transmission gear can be rotated under the drive of the driving gear, so as to drive the left swing arm to swing, realizing the approach or separation of the rear ends of the left swing arm and the right swing arm.

[0009] In a further preferred solution, the gear-type adjusting device further includes a limiting device capable of preventing the driving knob from rotating by itself. The setting of the limiting device can prevent the garment from loosening again under the action of external force when tightening the garment.

[0010] In a further preferred embodiment, the limiting device includes an internal gear and a tooth engaging member. The internal gear is fixedly arranged in the fixed seat, the tooth engaging member is arranged on the driving knob, and a engaging groove matching with the teeth of the internal gear is arranged on the tooth engaging member. When the driving knob is rotated manually, the engaging groove of the tooth engaging member can be forced to move along the teeth of the internal gear, so as to tighten the clothes; after the adjustment is completed, the engaging groove of the tooth engaging member can be re-engaged with the teeth of the internal gear to prevent the driving knob from rotating reversely by itself.

[0011] In a still further preferred embodiment, the driving knob includes a knob, a limiting block and a driving plate. An annular groove is arranged on the outer side wall of the fixed seat, a convex edge matching with the annular groove is arranged on the inner side wall of the knob, and the knob can be rotatably covered on the fixed seat through the convex edge; the knob, the limiting block and the driving plate are connected in sequence from top to bottom, and the limiting block and the driving plate are respectively rotatably arranged in the fixed seat; the tooth engaging member is arranged on the limiting block; the front ends of the driving gear and the right swing arm are respectively installed on the driving plate. The driving knob is combined by a structure divided into three parts, which is convenient for assembly. Generally, holes for the left swing arm and the right swing arm to extend out and move are also formed on the side wall of the fixed seat.

[0012] In an even further preferred embodiment, a positioning post extending downward is arranged at the middle position of the knob, and a plurality of blocks extending downward are also arranged on the knob; a positioning hole is formed at the middle position of the limiting block, a plurality of card slots matching with the blocks are also formed on the limiting block, and a plurality of convex blocks extending downward are also arranged on the limiting block. The limiting block is sleeved on the positioning post through the positioning hole, and the blocks are engaged in the corresponding card slots; a positioning groove is formed at the middle position of the driving plate, a plurality of positioning grooves matching with the convex blocks are formed on the upper surface of the driving plate, the positioning post passes through the positioning hole and extends into the positioning groove, and each convex block on the limiting block is respectively inserted into the corresponding positioning groove. Through this setting, the limiting block and the driving plate can unify the rotation center through the positioning post, and the knob, the limiting block and the driving plate can rotate synchronously.

[0013] In a still further preferred embodiment, the tooth engaging member includes a plurality of arc-shaped elastic parts and a plurality of engaging parts. The number of the arc-shaped elastic parts is the same as that of the engaging parts and they correspond to each other one by one. The inner ends of the arc-shaped elastic parts are connected with the driving knob, the engaging parts are connected with the outer ends of the arc-shaped elastic parts, and the engaging groove is arranged at the outer end of the engaging part. With this structure, when the driving knob is rotated, the teeth of the internal gear can push the arc-shaped elastic parts to contract inward through the engaging parts, so that the engaging groove is temporarily disengaged from the teeth of the internal gear; after the adjustment is completed, the engaging part can return to the state where the engaging groove is engaged with the teeth of the internal gear under the elasticity of the arc-shaped elastic part again.

[0014] In a further preferred solution, a first rotating shaft is provided on the first transmission gear, and a first shaft hole matching the first rotating shaft is formed on the fixed seat. The first rotating shaft is rotatably installed in the first shaft hole. Generally, the first rotating shaft extends out of the first shaft hole, and a limiting member for preventing the first rotating shaft from disengaging from the first shaft hole is provided at the extending portion of the first rotating shaft.

[0015] In another further preferred solution, a second shaft hole is formed on the first transmission gear, and a fixed shaft matching the second shaft hole is provided on the fixed seat. The first transmission gear is rotatably sleeved on the fixed shaft through the second shaft hole. With this structure, the swing arm connected to the first transmission gear can be disassembled.

[0016] In a further preferred solution, the transmission ratio between the driving gear and the first transmission gear is 1:1. This setting can ensure that the swing amplitudes of the left swing arm and the right swing arm are the same.

[0017] In a further preferred solution, the first transmission gear is integrally formed with the left swing arm. Generally, the first transmission gear is formed by providing teeth at the front end of the corresponding swing arm.

[0018] In another further preferred solution, the transmission assembly includes a first transmission gear and a second transmission gear. The first transmission gear is connected to the front end of the left swing arm, and the second transmission gear is connected to the front end of the right swing arm. The first transmission gear meshes with the driving gear; the second transmission gear meshes with the first transmission gear, or the second transmission gear meshes with the driving gear through a driven gear. The left swing arm and the right swing arm can also respectively mesh with the driving gear through the transmission gears, so as to realize the mutual approach or separation of the rear ends of the left swing arm and the right swing arm.

[0019] In a further preferred solution, a first rotating shaft is provided on the first transmission gear, and a second rotating shaft is provided on the second transmission gear. The fixed seat is provided with a first shaft hole and a second shaft hole. The first shaft hole matches the first rotating shaft, and the second shaft hole matches the second rotating shaft. The first rotating shaft is rotatably installed in the first shaft hole, and the second rotating shaft is rotatably installed in the second shaft hole. Generally, the first rotating shaft extends out of the first shaft hole, and a first limiting member for preventing the first rotating shaft from disengaging from the first shaft hole is provided at the extending portion of the first rotating shaft; the second rotating shaft extends out of the second shaft hole, and a second limiting member for preventing the second rotating shaft from disengaging from the second shaft hole is provided at the extending portion of the second rotating shaft.

[0020] In another further preferred solution, a third shaft hole is formed in the first transmission gear, a fourth shaft hole is formed in the second transmission gear, a first fixed shaft and a second fixed shaft are provided on the fixed seat, the first fixed shaft is matched with the third shaft hole, the second fixed shaft is matched with the fourth shaft hole, the first transmission gear is rotatably sleeved on the first fixed shaft through the third shaft hole, and the second transmission gear is rotatably sleeved on the second fixed shaft through the fourth shaft hole. With this structure, both the left swing arm and the right swing arm can be disassembled.

[0021] In a further preferred solution, the transmission ratio of the first transmission gear to the second transmission gear is 1:1. This setting can ensure that the swing amplitudes of the left swing arm and the right swing arm are the same.

[0022] In a further preferred solution, the first transmission gear is integrally formed with the left swing arm, and the second transmission gear is integrally formed with the right swing arm. Generally, the first transmission gear is formed by providing teeth at the front end of the left swing arm, and the second transmission gear is formed by providing teeth at the front end of the right swing arm.

[0023] The beneficial effects of the present utility model are as follows: This gear-type adjusting device can not only stably adjust the distance between two objects, but also does not require a wire for control, has strong stability during adjustment, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the gear-type adjusting device in Embodiment 1 of the present utility model;

[0025] Figure 2 is an exploded view of the gear-type adjusting device in Embodiment 1 of the present utility model;

[0026] Figure 3 is an exploded view of the gear-type adjusting device in Embodiment 1 of the present utility model from another angle;

[0027] Figure 4 is a schematic structural diagram of the gear-type adjusting device in Embodiment 1 of the present utility model after removing the knob;

[0028] Figure 5 is a schematic structural diagram of the knob in Embodiment 1 of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0030] Embodiment 1, as Figures 1-5A gear-type adjusting device shown in the figure includes a fixed seat 1, a left swing arm 2, a right swing arm 3 and a gear-type driving mechanism 4. The front ends of the left swing arm 2 and the right swing arm 3 are respectively rotatably arranged on the fixed seat 1; the extension lines of the left swing arm 2 and the right swing arm 3 intersect; the gear-type driving mechanism 4 includes a driving knob 401, a driving gear 402 and a transmission component. The driving knob 401 is rotatably arranged on the fixed seat 1, and the driving gear 402 is installed on the driving knob 401; the transmission component is a first transmission gear 403, the first transmission gear 403 is rotatably arranged on the fixed seat 1, the first transmission gear 403 meshes with the driving gear 402, and the first transmission gear 403 is connected to the front end of the left swing arm 2; the front end of the right swing arm 3 is connected to the driving knob 401.

[0031] In the above gear-type adjusting device, the left swing arm 2 and the right swing arm 3 are completely fixed along the length direction (such as sewing, tying, etc.) on two adjustment objects (such as two sides of the clothing to be adjusted or two shoelaces, etc.). At this time, the fixed seat 1 can also be sewn on the clothing or the shoe surface without being suspended. When in use, only by rotating the driving knob 401, the driving gear 402 can be rotated accordingly. The right swing arm can directly swing with the rotation of the driving knob 401. The first transmission gear 403 can be rotated under the drive of the driving gear 402 to drive the left swing arm to swing, so that the rear ends of the left swing arm 2 and the right swing arm 3 approach or move away from each other, realizing the adjustment of the tightness of the connected clothing. In this gear-type adjusting device, the left swing arm 2 and the right swing arm 3 can be directly connected to the two sides of the clothing to be adjusted respectively, and the rear ends of the left swing arm 2 and the right swing arm 3 are directly driven by the gear-type driving mechanism 4 to approach or move away from each other without using a wire for control. It has strong stability, is not easy to get stuck, has a long service life, and at the same time has a simple structure and is more convenient to assemble. In the above connection method, the left swing arm 2 and the right swing arm 3 can be replaced with each other.

[0032] The gear-type adjusting device further includes a limiting device 5 that can prevent the driving knob 401 from rotating by itself. The limiting device 5 includes an internal gear 501 and a tooth engaging member 502. The internal gear 501 is fixedly arranged in the fixed seat 1, the tooth engaging member 502 is arranged on the driving knob 401, and a engaging groove 5021 matching the teeth of the internal gear 501 is provided on the tooth engaging member 502. The limiting device 5 can prevent the clothing from loosening again under the action of external force when tightening the clothing. When manually rotating the driving knob 401, the engaging groove 5021 of the tooth engaging member 502 can be forced to move along the teeth of the internal gear 501, so as to tighten the clothing; after the adjustment is completed, the engaging groove 5021 of the tooth engaging member 502 can be re-engaged with the teeth of the internal gear 501 to prevent the driving knob 401 from rotating in the reverse direction by itself.

[0033] The driving knob 401 includes a knob 4011, a limiting block 4012 and a driving plate 4013. An annular groove 101 is provided on the outer sidewall of the fixed seat 1, and a convex edge 40111 matching the annular groove 101 is provided on the inner sidewall of the knob 4011. The knob 4011 can be rotatably covered on the fixed seat 1 through the convex edge 40111; the knob 4011, the limiting block 4012 and the driving plate 4013 are connected in sequence from top to bottom, and the limiting block 4012 and the driving plate 4013 are respectively rotatably located in the fixed seat 1; a gear engaging member 502 is arranged on the limiting block 4012; the driving gear 402 and the front end of the right swing arm 3 are respectively installed on the driving plate 4013. The driving knob 401 adopts a structure divided into three parts for combination, which is convenient for assembly. A hole position for the left swing arm 2 and the right swing arm 3 to extend and move is also provided on the sidewall of the fixed seat 1.

[0034] A positioning post 40112 extending downward is provided at the middle position of the knob 4011, and a plurality of blocks 40113 extending downward are also provided on the knob 4011; a positioning hole 40121 is opened at the middle position of the limiting block 4012, and a plurality of card slots 40122 matching the blocks 40113 are also opened on the limiting block 4012. A plurality of protrusions 40123 extending downward are also provided on the limiting block 4012. The limiting block 4012 is sleeved on the positioning post 40112 through the positioning hole 40121, and the blocks 40113 are engaged in the corresponding card slots 40122; a positioning groove 40131 is opened at the middle position of the driving plate 4013, and a plurality of positioning grooves 40132 matching the protrusions 40123 are opened on the upper surface of the driving plate 4013. The positioning post 40112 passes through the positioning hole 40121 and extends into the positioning groove 40131, and each protrusion 40123 on the limiting block 4012 is respectively inserted into the corresponding positioning groove 40132. Through this setting, the limiting block 4012 and the driving plate 4013 can unify the rotation center through the positioning post 40112, and the knob 4011, the limiting block 4012 and the driving plate 4013 can rotate synchronously.

[0035] The gear engaging member 502 includes a plurality of arc-shaped elastic parts 5022 and a plurality of engaging parts 5023. The number of the arc-shaped elastic parts 5022 is the same as that of the engaging parts 5023 and they correspond one by one. The inner end of the arc-shaped elastic part 5022 is connected to the driving knob 401, the engaging part 5023 is connected to the outer end of the arc-shaped elastic part 5022, and a engaging groove 5021 is provided at the outer end of the engaging part 5023. With this structure, when the driving knob 401 is rotated, the teeth of the internal gear 501 can push the arc-shaped elastic part 5022 to contract inward through the engaging part 5023, so that the engaging groove 5021 is temporarily disengaged from the teeth of the internal gear 501; after the adjustment is completed, the engaging part 5023 can return to the state where the engaging groove 5021 is engaged with the teeth of the internal gear 501 again under the elasticity of the arc-shaped elastic part 5022.

[0036] The first transmission gear 403 is provided with a first rotating shaft 4031. A first shaft hole 102 matching the first rotating shaft 4031 is formed on the fixed seat 1, and the first rotating shaft 4031 is rotatably installed in the first shaft hole 102. The first rotating shaft 4031 extends out of the first shaft hole 102, and a limiting member for restricting the first rotating shaft 4031 from disengaging from the first shaft hole 102 is provided at the extending part of the first rotating shaft 4031.

[0037] The transmission ratio of the driving gear 402 and the first transmission gear 403 is 1:1. This setting can ensure that the swinging amplitudes of the left swing arm 2 and the right swing arm 3 are the same.

[0038] The first transmission gear 403 is integrally formed with the left swing arm 2. The first transmission gear 403 is formed by cutting teeth at the front end of the corresponding swing arm.

[0039] Embodiment 2. The difference between this embodiment and Embodiment 1 is that: a second shaft hole is formed on the first transmission gear, a fixed shaft matching the second shaft hole is provided on the fixed seat, and the first transmission gear is rotatably sleeved on the fixed shaft through the second shaft hole. With this structure, the swing arm connected to the first transmission gear can be disassembled.

[0040] Embodiment 3. The difference between this embodiment and Embodiment 1 is that: the transmission assembly includes a first transmission gear and a second transmission gear. The first transmission gear is connected to the front end of the left swing arm, the second transmission gear is connected to the front end of the right swing arm, and the first transmission gear meshes with the driving gear; the second transmission gear meshes with the first transmission gear. The left swing arm and the right swing arm can also respectively mesh with the driving gear through the transmission gears, so as to realize the mutual approach or separation of the rear ends of the left swing arm and the right swing arm.

[0041] The first transmission gear is provided with a first rotating shaft, the second transmission gear is provided with a second rotating shaft, a first shaft hole and a second shaft hole are formed on the fixed seat, the first shaft hole matches the first rotating shaft, the second shaft hole matches the second rotating shaft, the first rotating shaft is rotatably installed in the first shaft hole, and the second rotating shaft is rotatably installed in the second shaft hole. Generally, the first rotating shaft extends out of the first shaft hole, and a first limiting member for restricting the first rotating shaft from disengaging from the first shaft hole is provided at the extending part of the first rotating shaft; the second rotating shaft extends out of the second shaft hole, and a second limiting member for restricting the second rotating shaft from disengaging from the second shaft hole is provided at the extending part of the second rotating shaft.

[0042] The transmission ratio of the first transmission gear and the second transmission gear is 1:1. This setting can ensure that the swinging amplitudes of the left swing arm and the right swing arm are the same.

[0043] The first transmission gear is integrally formed with the left swing arm, and the second transmission gear is integrally formed with the right swing arm. The first transmission gear is formed by cutting teeth at the front end of the left swing arm, and the second transmission gear is formed by cutting teeth at the front end of the right swing arm.

[0044] Embodiment 4. The difference between this embodiment and Embodiment 3 is that the second transmission gear is engaged with the driving gear through the driven gear.

[0045] Embodiment 5. The difference between this embodiment and Embodiment 3 is that a third shaft hole is formed in the first transmission gear, a fourth shaft hole is formed in the second transmission gear, a first fixed shaft and a second fixed shaft are provided on the fixed seat, the first fixed shaft is matched with the third shaft hole, the second fixed shaft is matched with the fourth shaft hole, the first transmission gear is rotatably sleeved on the first fixed shaft through the third shaft hole, and the second transmission gear is rotatably sleeved on the second fixed shaft through the fourth shaft hole. With this structure, both the left swing arm and the right swing arm can be disassembled.

Claims

1. A gear-type adjusting device, comprising a fixed seat, a left swing arm and a right swing arm, wherein the front ends of the left swing arm and the right swing arm are respectively rotatably arranged on the fixed seat; the left swing arm and the right swing arm are arranged in a cross manner, or the extension lines of the left swing arm and the right swing arm intersect; and it is characterized in that: It further includes a gear-type driving mechanism for directly driving the rear ends of the left swing arm and the right swing arm to approach or move away from each other.

2. The gear type adjusting device according to claim 1, characterized in that: The gear-type driving mechanism includes a driving knob, a driving gear, and a transmission component. The driving knob is rotatably arranged on the fixed seat, and the driving gear is mounted on the driving knob; the transmission component is rotatably arranged on the fixed seat; the front end of the left swing arm is in transmission connection with the driving gear through the transmission component, the front end of the right swing arm is connected to the driving knob, or the front ends of the left swing arm and the right swing arm are respectively in transmission connection with the driving gear through the transmission component.

3. A gear-type adjusting device according to claim 2, characterized in that: The transmission component includes a first transmission gear, which is rotatably arranged on the fixed seat, meshes with the driving gear, and is connected to the front end of the left swing arm; the front end of the right swing arm is connected to the driving knob.

4. The gear type adjusting device according to claim 3, characterized in that: The gear-type adjusting device further includes a limiting device capable of preventing the driving knob from rotating by itself.

5. The gear type adjusting device according to claim 4, wherein: The limiting device includes an internal gear and a tooth-positioning member. The internal gear is fixedly arranged in the fixed seat, the tooth-positioning member is arranged on the driving knob, and the tooth-positioning member is provided with a positioning groove matching the teeth of the internal gear.

6. The gear type adjusting device according to claim 5, wherein: The driving knob includes a knob, a limiting block, and a driving plate. The outer side wall of the fixed seat is provided with an annular groove, and the inner side wall of the knob is provided with a convex edge matching the annular groove. The knob is rotatably covered on the fixed seat through the convex edge; the knob, the limiting block, and the driving plate are sequentially connected from top to bottom, and the limiting block and the driving plate are respectively rotatably located in the fixed seat; The tooth-positioning member is arranged on the limiting block; the driving gear and the front end of the right swing arm are respectively mounted on the driving plate.

7. A gear type adjusting device according to claim 6, characterized in that: A positioning column extending downward is provided at the middle position of the knob, and a plurality of blocks extending downward are further provided on the knob; a positioning hole is opened at the middle position of the limiting block, a plurality of card slots matching the blocks are also opened on the limiting block, and a plurality of convex blocks extending downward are further provided on the limiting block. The limiting block is sleeved on the positioning column through the positioning hole, and the blocks are clamped in the corresponding card slots; a positioning groove is opened at the middle position of the driving plate, and a plurality of positioning grooves matching the convex blocks are opened on the upper surface of the driving plate. The positioning column passes through the positioning hole and extends into the positioning groove, and each convex block on the limiting block is respectively inserted into the corresponding positioning groove.

8. The gear type adjusting device according to claim 5, characterized in that: The tooth-positioning member includes a plurality of arc-shaped elastic parts and a plurality of positioning parts. The number of the arc-shaped elastic parts is the same as that of the positioning parts and they correspond one by one. The inner ends of the arc-shaped elastic parts are connected to the driving knob, the positioning parts are connected to the outer ends of the arc-shaped elastic parts, and the outer ends of the positioning parts are provided with the positioning grooves.

9. The gear type adjusting device according to claim 3, characterized in that: A first rotating shaft is provided on the first transmission gear, and a first shaft hole matching the first rotating shaft is opened on the fixed seat. The first rotating shaft is rotatably installed in the first shaft hole; the transmission ratio between the driving gear and the first transmission gear is 1:1; the first transmission gear is integrally formed with the left swing arm.

10. A gear-type adjusting device according to claim 3, characterized in that: A second shaft hole is opened on the first transmission gear, and a fixed shaft matching the second shaft hole is provided on the fixed seat. The first transmission gear is rotatably sleeved on the fixed shaft through the second shaft hole; the transmission ratio between the driving gear and the first transmission gear is 1:1; the first transmission gear is integrally formed with the left swing arm.

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