Guitar strap with finely adjustable length

Abstract

The utility model relates to a guitar strap with finely adjustable length, which comprises a strap body and a snap ring, and further comprises a fine adjuster, the strap body comprises a first strap body, a second strap body and a third strap body, the first strap body is connected with the second strap body, and the third strap body is connected with the snap ring. The second strap body is connected with the fine adjustment device and can stretch out and draw back relative to the fine adjustment device, the third strap body is fixedly connected with the fine adjustment device and is fixedly connected with the clamping ring, and the clamping ring is arranged on the first strap body in a penetrating mode and keeps relative fixation of the first strap body and the third strap body. According to the utility model, the fine adjustment device with the first rotating shaft, the tension spring, the coil spring and the like is arranged, and the operation modes of pulling, returning, quick pulling and quick loosening are matched, so that the length of the strap body is quickly and conveniently finely adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of guitars, in particular to a guitar strap with fine-adjustable length. Background Art

[0002] The adjustment structure of the guitar strap in the prior art is usually located at the middle connection of the strap or near the two ends, and is used to adjust the length of the strap. These adjustment structures are usually metal clasps, plastic buckles or drawstrings, etc., and the two ends of the strap are connected to the upper and lower parts of the guitar through connectors, which are usually hooks, leather rings or ropes. There is an obvious problem in the direction of adjusting the length of the strap, that is, the strap can only be adjusted to a roughly suitable length through the adjustment structure. When the length needs to be fine-tuned, on the one hand, there is a lack of special components that can conveniently realize the fine-tuning function. On the other hand, when fine-tuning through the adjustment mechanism, such as the metal clasp, the operation is cumbersome, and the strap needs to be constantly retracted and released and the guitar is tried on to determine the appropriate length. The situation where the length of the strap needs to be fine-tuned usually occurs in emergencies at the performance site, such as temporary replacement of the guitar, the influence of the performance costume on the length of the strap, the need to temporarily shorten the strap for on-site interaction, two people playing a guitar at the same time, that is, one person pressing the strings and the other plucking the strings, the metal clasp and the like naturally loosening, etc. At this time, it is necessary to fine-tune the length of the strap, and it can be fine-tuned quickly and conveniently. For example, the Chinese utility model patent CN210606605U discloses an electric guitar strap buckle, which is provided with a fastener connection end, a fastener bending part and a fastener hook end, wherein the fastener connection end is rotatably connected to the end of the lower strap section, the fastener bending part is turned 180 degrees and bent to the other side of the upper strap section, the fastener hook end extends from the fastener bending part to the upper middle part of the upper strap section, and a plurality of strap holes are provided in the middle part of the upper strap section, and the fastener hook end is buckled and connected with the strap holes. The aforementioned patent uses the fastener formed by bending a single steel bar to cooperate with the strap hole to adjust the strap length. This jack-type adjustment method is obviously not suitable for fine-tuning the strap length. Another example is a guitar strap without tail nails and a guitar equipped with the strap disclosed in Chinese utility model patent CN206849484U, wherein the guitar strap includes a head fixing strap and a tail fixing strap, one end of the tail fixing strap is provided with a closed fixing ring, the other end of the tail fixing strap is provided with a hook connected to one end of the head fixing strap, and the other end of the head fixing strap is provided with a head fixing mechanism; the tail fixing strap is wrapped and fixed on the waist of the guitar body, the hook passes through the fixing ring and is fixedly connected to one end of the head fixing strap, and the other end of the head fixing strap is fixedly connected to the head of the guitar body through the head fixing mechanism. The aforementioned patent also cannot perform micro-adjustment of the strap length.

[0003] In view of this, the utility model provides a guitar strap with fine-tunable length, which realizes fast and convenient fine-tuning of the strap length by providing a fine-tuner having components such as a first rotating shaft, a tension spring and a coil spring, thereby solving the technical problem in the prior art that the strap length cannot be fine-tuned or conveniently. Utility Model Content

[0004] The utility model is intended to provide a guitar strap with fine-adjustable length to solve the deficiencies in the prior art. The technical problem to be solved by the utility model is achieved through the following technical solutions.

[0005] A guitar strap with fine-tunable length, comprising a strap body and a clasp, wherein the improvement is that it also comprises a fine-tuner, the strap body comprising a first strap body, a second strap body and a third strap body, the first strap body being connected to the second strap body, the second strap body being connected to the fine-tuner and being retractable relative to the fine-tuner, the third strap body being fixedly connected to the fine-tuner and to the clasp, the clasp being passed through the first strap body and keeping the first strap body and the third strap body relatively fixed; the fine-tuner comprising a housing, a mounting plate fixedly arranged inside the housing, a first rotating shaft rotatably arranged on the mounting plate, and a rebound portion; the mounting plate is provided with a strip hole, the first rotating shaft being rotatably arranged on the mounting plate The cam is an assembly made of a plurality of independently controlled wheels, wherein the plurality of independently controlled wheels are connected to each other with a plurality of independently controlled wheels, and the plurality of independently controlled wheels are connected to each other with a plurality of independently controlled wheels.

[0006] Preferably, the rebound portion further comprises a support rod fixedly connected to the fixing rod, and a support ring fixedly connected to the support rod, and the first rotating shaft passes through the support ring and can rotate relative to the support ring.

[0007] Preferably, first annular baffles are provided on the first rotating shaft at both ends of the second shoulder strap body, and the first annular baffles are used to limit the second shoulder strap body.

[0008] Preferably, a second annular baffle is provided on the first rotating shaft at the outer end of the coil spring, and the second annular baffle is used to limit the coil spring.

[0009] Preferably, it further comprises a buckle, wherein there are two buckles, which are respectively arranged at one end of the first strap body and at the connection between the first strap body and the second strap body.

[0010] Preferably, the buckle includes a first connecting ring connected to the strap body, and a second connecting ring rotatably connected to the first connecting ring, the second connecting ring is used to be connected to the guitar, and the second connecting ring is provided with a second rotating shaft and is rotatably connected to the first connecting ring through the second rotating shaft.

[0011] In the utility model: the shell is used to wrap and protect the internal components of the fine-tuner and provide support for the installation of the mounting plate. The mounting plate is used to install the first rotating shaft, the rebound part and other components. The first rotating shaft is used to wind the second strap body and the coil spring, and serves as the rotation support shaft of the second strap body and the coil spring. The rebound part is used to provide elastic force for the winding of the second strap body. The strip hole on the mounting plate is used to provide support for the rotation of the first rotating shaft and provide travel space for the sliding of the first rotating shaft, while limiting the first rotating shaft to only be able to move in two degrees of freedom, namely, rotation and up and down sliding, and cannot move left and right. The conical block cooperates with the gear, so that the first shaft cannot rotate when it is at the upper end of the strip hole. On the one hand, the first shaft located at the upper end of the strip hole cannot rotate to maintain the stability of the length of the strap body. On the other hand, the first shaft located at the upper end of the strip hole cannot rotate when pulled by the second strap body and can only slide downward along the strip hole, so that the gear is disengaged from the conical block, thereby providing the second strap body with a degree of freedom of movement for being pulled and stretched and for being driven by the coil spring to wrap around the first shaft, thereby achieving a fine adjustment of the length of the strap body. The slide groove is used to provide a travel space for the fixing rod to slide up and down and to limit the fixing rod from moving left and right, and at the same time provide an installation position for fixing one end of the tension spring. The tension spring is used to pull the fixing rod, the first shaft and the gear on the first shaft back to their original positions, so that the gear and the conical block can be re-engaged after being disengaged. The coil spring is used to provide an elastic force for the second strap body to wrap around the first rotating shaft, and the fixing rod is used to fix one end of the coil spring so that the coil spring can be smoothly tightened and loosened and provide a force point for the return of the first rotating shaft. In the utility model, the coil spring is wound around the first rotating shaft clockwise, and the second strap body is wound around the first rotating shaft counterclockwise. When the second strap body is pulled, the first rotating shaft rotates counterclockwise driven by the second strap body, and the coil spring is tightened counterclockwise driven by the first rotating shaft; when the second strap body is loosened, the coil spring is loosened clockwise under the action of its own elastic force, and the first rotating shaft rotates clockwise under the action of the elastic force of the coil spring, and the second strap body is driven by the first rotating shaft to wrap around the first rotating shaft clockwise.

[0012] Compared with the prior art, the utility model realizes fast and convenient fine adjustment of the length of the shoulder strap body by providing a fine adjuster having components such as a first rotating shaft, a tension spring and a coil spring, and cooperating with the operation mode of pulling back and quick pulling and quick releasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the utility model from another angle;

[0015] Figure 3 It is a structural schematic diagram of the fine-tuning device in the utility model;

[0016] Figure 4 This is a front view structural diagram of the fine tuner in the utility model;

[0017] Figure 5 It is a right side structural schematic diagram of the fine-tuning device in the utility model;

[0018] Figure 6 for Figure 4 AA section view in;

[0019] Figure 7 for Figure 4 BB section view in;

[0020] Figure 8 for Figure 4 CC section view in;

[0021] Fig. 9 It is a structural schematic diagram of the buckle in the utility model;

[0022] Fig.10 This is a schematic diagram of the structure of the clamping ring in the utility model;

[0023] The reference numerals in the accompanying drawings are: 1. strap body, 11. first strap body, 12. second strap body, 13. third strap body, 2. fine-tuner, 21. mounting plate, 211. strip hole, 212. slide groove, 213. tension spring, 214. conical block, 22. first rotating shaft, 221. first annular baffle, 222. second annular baffle, 223. gear, 23. rebound part, 231. coil spring, 232. fixing rod, 233. support rod, 234. support ring, 31. buckle, 311. first connecting ring, 312. second connecting ring, 313. second rotating shaft, 32. buckle. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Embodiment 1:

[0026] Reference Figure 1 , 2As shown, a guitar strap with fine adjustment in length comprises a strap body 1 and a snap ring 32, wherein the improvement lies in that: it also comprises a fine tuner 2, the strap body 1 comprises a first strap body 11, a second strap body 12 and a third strap body 13, the first strap body 11 is connected to the second strap body 12, the second strap body 12 is connected to the fine tuner 2 and can be extended and retracted relative to the fine tuner 2, the third strap body 13 is fixedly connected to the fine tuner 2 and to the snap ring 32, the snap ring 32 is passed through the first strap body 11 and keeps the first strap body 11 and the third strap body 13 relatively fixed.

[0027] In this embodiment: the first strap body 11, the second strap body 12, and the third strap body 13 together constitute the strap body 1; the snap ring 32 is used to adjust the position of the third strap body 13 relative to the first strap body 11 to roughly adjust the length of the strap body 1, and keep the relative position of the third strap body 13 and the first strap body 11 fixed to keep the length of the strap body 1 stable; the fine adjuster 2 is used to adjust the telescopic length of the second strap body 12, thereby fine-tuning the length of the strap body 1.

[0028] Further, see Figure 1 , 2 As shown in FIG. 9 , this embodiment further includes a buckle 31 . There are two buckle 31 , which are respectively arranged at one end of the first shoulder strap body 11 and at the connection between the first shoulder strap body 11 and the second shoulder strap body 12 .

[0029] Furthermore, the buckle 31 includes a first connecting ring 311 connected to the strap body 1 and a second connecting ring 312 rotatably connected to the first connecting ring 311, wherein the second connecting ring 312 is used to be connected to a guitar, and a second rotating shaft 313 is provided on the second connecting ring 312 and is rotatably connected to the first connecting ring 311 via the second rotating shaft 313.

[0030] In this embodiment, the buckle 31 is used to connect the strap body 1 with the upper and lower ends of the guitar, the first connecting ring 311 is used to connect with the strap body 1, and the second connecting ring 312 is used to connect with the guitar. The second connecting ring 312 is rotatably connected to the first connecting ring 311 through the second rotating shaft 313 to achieve adaptive adjustment of the angle of the strap body 1 relative to the guitar, thereby achieving the effect that the strap body 1 can both comfortably fit the human body as a shoulder strap and be connected to the guitar.

[0031] Further, see Figures 3 to 8As shown, the fine tuner 2 includes a housing, a mounting plate 21 fixedly arranged inside the housing, a first rotating shaft 22 rotatably arranged on the mounting plate 21, and a rebound portion 23; a strip hole 211 is provided on the mounting plate 21, the first rotating shaft 22 is rotatably arranged in the strip hole 211 and can slide relative to the strip hole 211, a conical block 214 is provided on the mounting plate 21 at a position above the strip hole 211, and a gear 223 matching the conical block 214 is fixedly provided at the end of the first rotating shaft 22; a slide groove 21 is provided on the mounting plate 21 at a position above the conical block 214 2. A tension spring 213 is provided in the slide slot 212; the rebound portion 23 includes a coil spring 231 wound on the first rotating shaft 22, and a fixing rod 232 fixedly connected to the other end of the coil spring 231, the fixing rod 232 is slidably arranged in the slide slot 212, one end of the tension spring 213 is fixedly connected to the fixing rod 232, and the other end is fixedly arranged at the upper end of the slide slot 212; a part of the second strap body 12 is wound on the first rotating shaft 22, and the winding direction of the second strap body 12 around the first rotating shaft 22 is opposite to the winding direction of the coil spring 231 around the first rotating shaft 22.

[0032] In this embodiment: the shell is used to wrap and protect the internal components of the fine tuner 2 and provide support for the installation of the mounting plate 21. The mounting plate 21 is used to install the first rotating shaft 22, the rebound part 23 and other components. The first rotating shaft 22 is used to wind the second strap body 12 and the coil spring 231, and serves as the rotation support shaft of the second strap body 12 and the coil spring 231. The rebound part 23 is used to provide elastic force for the winding of the second strap body 12. The strip hole 211 on the mounting plate 21 is used to provide support for the rotation of the first rotating shaft 22 and provide travel space for the sliding of the first rotating shaft 22, while limiting the first rotating shaft 22 to only be able to perform two degrees of freedom of rotation and up and down sliding, and cannot move left and right. The conical block 214 cooperates with the gear 223, so that the first shaft 22 cannot rotate when it is at the upper end of the strip hole 211. On the one hand, the first shaft 22 at the upper end of the strip hole 211 cannot rotate to maintain the stability of the length of the shoulder strap body 1. On the other hand, the first shaft 22 at the upper end of the strip hole 211 cannot rotate when pulled by the second shoulder strap body 12, but can only slide downward along the strip hole 211, so that the gear 223 is separated from the conical block 214, thereby providing the second shoulder strap body 12 with a degree of freedom of movement for being pulled and stretched and for being driven by the coil spring 231 to rewind the first shaft 22, so as to achieve a fine adjustment of the length of the shoulder strap body 1. The slide slot 212 is used to provide a travel space for the fixing rod 232 to slide up and down and to limit the fixing rod 232 from moving left and right, and at the same time provide an installation position for fixing one end of the tension spring 213. The tension spring 213 is used to pull the fixing rod 232, the first rotating shaft 22 and the gear 223 on the first rotating shaft 22 back to their original positions, so that the gear 223 and the conical block 214 can re-engage after being disengaged. The coil spring 231 is used to provide an elastic force for the second strap body 12 to rewind around the first rotating shaft 22, and the fixing rod 232 is used to fix one end of the coil spring 231 so that the coil spring 231 can be tightened and loosened smoothly and provide a force point for the return of the first rotating shaft 22. Figure 7 , 8As shown, in this embodiment, the coil spring 231 is wound around the first rotating shaft 22 in a clockwise manner, and the second strap body 12 is wound around the first rotating shaft 22 in a counterclockwise manner. When the second strap body 12 is pulled, the first rotating shaft 22 rotates counterclockwise under the drive of the second strap body 12, and at this time, the coil spring 231 is tightened counterclockwise by the drive of the first rotating shaft 22; when the second strap body 12 is loosened, the coil spring 231 is loosened clockwise under the action of its own elastic force, and the first rotating shaft 22 rotates clockwise under the elastic force of the coil spring 231, and at this time, the second strap body 12 is driven by the first rotating shaft 22 to be wound back to the first rotating shaft 22 in a clockwise manner.

[0033] The initial position and initial state of this embodiment are defined as follows: the first rotating shaft 22 is located at the upper end of the strip hole 211, which is the initial position; the first rotating shaft 22 is at the initial position, the conical block 214 is engaged with the gear 223, the tension spring 213 and the coil spring 231 are in a natural state, and the second strap body 12 is wound around the first rotating shaft 22 for multiple turns, which is the initial state. In this embodiment, it is assumed that the second strap body 12 is wound around the first rotating shaft 22 for ten turns in the initial state.

[0034] When this embodiment is used, it is in the initial state. First, pull the second strap body 12. Due to the engagement of the conical block 214 and the gear 223, the first shaft 22 cannot rotate. Due to the limitation of the strip hole 211, the first shaft 22 moves downward along the strip hole 211 under the pull of the second strap body 12. Continue to pull the second strap body 12 until the gear 223 is disengaged from the conical block 214. Continue to pull the strap body 12 so that a part of the strap body 12 extends out of the fine-tuner 2, for example, five turns. At this time, the tension spring 213 is in a stretched state and the coil spring 231 is in a tightened state. Then, keep pulling the second strap body 12. The force of the second strap body 12 remains unchanged or slightly decreases and the second strap body 12 is sent back. Under the pulling force of the tension spring 213, the first rotating shaft 22 returns to the initial position. Since the force pulling the second strap body 12 remains unchanged or slightly decreases, the coil spring 231 cannot be loosened, and the second strap body 12 cannot be driven by the coil spring 231 to be wound back onto the first rotating shaft 22. At this time, the conical block 214 and the gear 223 are engaged so that the second strap body 12 is in the current length state. At this time, the tension spring 213 is in a natural state and the coil spring 231 is in a tightened state. Then, by coarsely adjusting the clamp ring 32 is positioned relative to the first strap body 11 so as to adjust the length of the strap body 1 to a basically appropriate length; then: if it is necessary to lengthen the strap body 1, pull the second strap body 12 until the gear 223 is disengaged from the conical block 214, and continue to pull the second strap body 12 to an appropriate length, then keep the force pulling the second strap body 12 unchanged or slightly reduce it and send the second strap body 12 back until the gear 223 is re-engaged with the conical block 214, that is, pull and send it back for fine-tuning; if the length of the strap body 1 is still short, repeat the operation until the length is appropriate; if it is necessary to shorten the strap When the second strap body 1 is pulled, the second strap body 12 is quickly pulled. Due to the fast pulling speed, the first rotating shaft 22 will quickly slide down to the lower end of the strip hole 211 driven by the second strap body 12 and rotate a little or not rotate. At this time, the second strap body 12 is quickly released. During the process of the tension spring 213 pulling the first rotating shaft 22 back to the initial position, the coil spring 231 will drive the first rotating shaft 22 to rotate, thereby contracting the second strap body 12 until the gear 223 is re-engaged with the conical block 214, that is, quick pulling and quick loosening to fine-tune the shortening; if the length of the strap body 1 is still long, repeat the operation until the length is appropriate.

[0035] Compared with the prior art, this embodiment realizes fast and convenient fine adjustment of the length of the shoulder strap body 1 by providing a fine-tuning device having components such as a first rotating shaft 22, a tension spring 213 and a coil spring 231, and cooperating with the operation mode of pulling back and quick pulling and quick releasing.

[0036] Embodiment 2:

[0037] Based on Example 1, Figure 4 , 6 As shown, the rebound portion 23 also includes a support rod 233 fixedly connected to the fixing rod 232 and a support ring 234 fixedly connected to the support rod 233 . The first rotating shaft 22 is passed through the support ring 234 and can rotate relative to the support ring 234 .

[0038] In this embodiment, by providing a support rod 233 and a support ring 234, on the one hand, the relative fixation between the fixing rod 232 and the first rotating shaft 22 can be maintained and the smooth rotation of the first rotating shaft 22 can be ensured, thereby ensuring the smooth tightening and loosening of the coil spring 231. On the other hand, the synchronous movement of the first rotating shaft 22 and the fixing rod 232 can be ensured, thereby preventing the first rotating shaft 22 from maintaining its original position when the fixing rod 232 moves due to the action of the coil spring 231.

[0039] Furthermore, a first annular baffle 221 is provided on the first rotating shaft 22 at both ends of the second strap body 12, and the first annular baffle 221 is used to limit the second strap body 12; a second annular baffle 222 is provided on the first rotating shaft 22 at the outer end of the coil spring 231, and the second annular baffle 222 is used to limit the coil spring 231.

[0040] In this embodiment: two first annular baffles 221 are provided to limit the second shoulder strap body 12 so that the second shoulder strap body 12 is located at a relatively fixed position on the first rotating shaft 22 when it is rewound and extended; two second annular baffles 222 are provided, and the two second annular baffles 222 respectively cooperate with the two first annular baffles 221 to limit the coil spring 231 so that the coil spring 231 is located at a relatively fixed position on the first rotating shaft 22 when it is tightened and loosened.

[0041] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments described in the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0044] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0045] For ease of description, spatially relative terms, such as "above", "above", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0046] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0047] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A guitar strap with fine-tunable length, comprising a strap body (1) and a clip (32), characterized in that: The invention also comprises a fine-tuning device (2), wherein the strap body (1) comprises a first strap body (11), a second strap body (12) and a third strap body (13), wherein the first strap body (11) is connected to the second strap body (12), the second strap body (12) is connected to the fine-tuning device (2) and can be extended and retracted relative to the fine-tuning device (2), the third strap body (13) is fixedly connected to the fine-tuning device (2) and is fixedly connected to the snap ring (32), and the snap ring (32) is inserted into the first strap body (11). The first strap body (11) is mounted on the shoulder strap body (11) and keeps the first strap body (11) and the third strap body (13) relatively fixed; the fine adjuster (2) comprises a housing, a mounting plate (21) fixedly arranged inside the housing, a first rotating shaft (22) rotatably arranged on the mounting plate (21), and a rebound portion (23); a strip hole (211) is provided on the mounting plate (21), the first rotating shaft (22) is rotatably arranged in the strip hole (211) and can slide relative to the strip hole (211), and the mounting plate (21 ) is provided with a conical block (214) at a position above the strip-shaped hole (211), and a gear (223) matching the conical block (214) is fixedly provided at the end of the first rotating shaft (22); a slide groove (212) is provided on the mounting plate (21) at a position above the conical block (214), and a tension spring (213) is provided in the slide groove (212); the rebound portion (23) includes a coil spring (231) wound on the first rotating shaft (22), and another coil spring (231) connected to the coil spring (231). A fixing rod (232) is fixedly connected at one end, and the fixing rod (232) is slidably arranged in the slide groove (212); one end of the tension spring (213) is fixedly connected to the fixing rod (232), and the other end is fixedly arranged at the upper end of the slide groove (212); a part of the second shoulder strap body (12) is wound on the first rotating shaft (22), and the winding direction of the second shoulder strap body (12) around the first rotating shaft (22) is opposite to the winding direction of the coil spring (231) around the first rotating shaft (22).

2. A guitar strap with fine-tuned length according to claim 1, characterized in that: The rebound portion (23) further comprises a support rod (233) fixedly connected to the fixed rod (232) and a support ring (234) fixedly connected to the support rod (233); the first rotating shaft (22) is inserted into the support ring (234) and can rotate relative to the support ring (234).

3. A guitar strap with fine-adjustable length according to claim 1, characterized in that: First annular baffles (221) are provided on the first rotating shaft (22) at both ends of the second shoulder strap body (12), and the first annular baffles (221) are used to limit the position of the second shoulder strap body (12).

4. A guitar strap with fine-tuned length according to claim 1, characterized in that: A second annular baffle (222) is provided on the first rotating shaft (22) at the outer end of the coil spring (231), and the second annular baffle (222) is used to limit the position of the coil spring (231).

5. The length-adjustable guitar strap according to claim 1, characterized in that: It also includes two buckles (31), which are respectively arranged at one end of the first shoulder strap body (11) and at the connection between the first shoulder strap body (11) and the second shoulder strap body (12).

6. A guitar strap with fine-tuned length according to claim 5, characterized in that: The buckle (31) comprises a first connecting ring (311) connected to the shoulder strap body (1), and a second connecting ring (312) rotatably connected to the first connecting ring (311); the second connecting ring (312) is used to be connected to a guitar; a second rotating shaft (313) is provided on the second connecting ring (312) and is rotatably connected to the first connecting ring (311) via the second rotating shaft (313).

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