Watchband head grain and watch

Abstract

The utility model relates to the technical field of watches, and provides a watch head grain and a watch, the watch head grain comprises a first head grain, a second head grain and an adjusting mechanism, the first head grain is provided with an accommodating cavity, and one side of the accommodating cavity in the length direction is provided with a first opening; the second head particle can telescopically move in the accommodating cavity through the first opening; the adjusting mechanism comprises a driving part, the driving part is connected with the second head particle and exposed out of one side of the first head particle in the width direction, and the driving part is used for driving the second head particle to move telescopically. According to the watchband, the overall length of the watchband head particles can be adjusted, so that the tightness of the watchband can be adjusted, and the watchband can meet the wearing requirements of different users.

Description

Technical Field

[0001] This application relates to the field of watch technology, and in particular to a watch strap end link and a watch. Background Technology

[0002] In existing watches, the end links are components installed at the front end of the strap and connected to the main unit. They are usually made of metal or plastic and are used to ensure wearing comfort and structural stability.

[0003] However, most existing watch straps are fixed in design and cannot be adjusted in length, which means they cannot be adjusted according to different users' wrist sizes. This can result in the straps being too tight or too loose when worn, affecting comfort and stability. Utility Model Content

[0004] The purpose of this application is to provide a watch strap end link and a watch, which aims to solve the problem that the length of existing watch straps is not adjustable and it is difficult to adapt to different users' wrists.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, some embodiments of this application provide a watchband end piece, including:

[0007] The first end piece is provided with a receiving cavity, and the receiving cavity has a first opening on one side in the length direction;

[0008] The second end piece is capable of telescopic movement within the accommodating cavity through the first opening;

[0009] The adjustment mechanism includes a drive member connected to the second headpiece and exposed on one side of the first headpiece in the width direction. The drive member is used to drive the second headpiece to extend and retract.

[0010] In some embodiments, the first headpiece is provided with a first guide channel and a second guide channel on one side in the width direction, the second guide channel is connected between the receiving cavity and the first guide channel, and both the first guide channel and the second guide channel extend along the direction of the extension and retraction of the second headpiece.

[0011] The driving component is a knob, and the adjustment mechanism also includes a drive shaft and a roller. One end of the drive shaft is rotatably connected to the second headstock, and the other end of the drive shaft passes through the second guide channel and the first guide channel and is fixedly connected to the knob. The roller is fixedly sleeved on the drive shaft and can roll in the second guide channel.

[0012] In some embodiments, the surface of the roller is provided with a plurality of convex strips spaced around it, each of the convex strips extending along the axial direction of the roller.

[0013] In some embodiments, the surface of the convex strip is an arc surface.

[0014] In some embodiments, the first headpiece has a first guide channel communicating with the accommodating cavity on one side in the width direction, and the first guide channel extends along the direction of the extension and retraction movement of the second headpiece.

[0015] The driving component is a push-pull component, and the adjustment mechanism further includes a transmission shaft. One end of the transmission shaft is fixedly connected to the second headstock, and the other end of the transmission shaft passes through the first guide channel and is fixedly connected to the push-pull component.

[0016] In some embodiments, the bottom of the accommodating cavity is provided with first toothed racks on both sides in the width direction, and the first toothed racks extend along the direction of the extension and retraction of the second head piece;

[0017] The second head piece has a second toothed rack on each side in the width direction, and each second toothed rack is meshed with each first toothed rack in a one-to-one correspondence.

[0018] In some embodiments, the tooth depth of the first rack and the second rack is 0.5 to 1.5 mm.

[0019] In some embodiments, the top wall of the accommodating cavity is provided with a limiting groove, and the top of the second head is provided with a limiting protrusion, the limiting protrusion being retractably and movably disposed within the limiting groove.

[0020] In some embodiments, the first headpiece is provided with a first connecting portion on the side opposite to the first opening, and the first connecting portion is used to rotatably connect to the main body of the watch.

[0021] The second end piece has a second connecting part on the side away from the receiving cavity, and the second connecting part is used to rotate and connect the watch strap.

[0022] Secondly, some embodiments of this application also provide a watch, including a main unit, a watch strap, and a watch strap end link as described in the above embodiments, wherein the main unit is connected to the first end link, and the watch strap is connected to the second end link.

[0023] The beneficial effects of the watch strap end links and watch provided in this application are as follows: Compared with the prior art, this application drives the second end link to extend or retract in the receiving cavity of the first end link through the external driving component, which can control the extension length of the second end link and realize the adjustment of the overall length of the watch strap end link, thereby adjusting the tightness of the watch strap and making the watch strap adaptable to the wearing needs of different users. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the watch strap end links provided in an embodiment of this application;

[0026] Figure 2 Exploded view of the structure of the watchband end piece provided in the embodiments of this application;

[0027] Figure 3 A schematic diagram of the structure of the first head grain from one perspective, provided in an embodiment of this application;

[0028] Figure 4 for Figure 3 Enlarged view of a portion at point A;

[0029] Figure 5 This is a structural schematic diagram of the first head particle from another perspective, provided as an embodiment of this application.

[0030] Figure 6 This is a schematic diagram of the assembly of the second headpiece and the adjustment mechanism provided in an embodiment of this application.

[0031] The following are the labeling elements in the figure:

[0032] 1. First end piece; 2. Second end piece; 3. Adjustment mechanism; 4. Receiving cavity; 5. First opening;

[0033] 6. Driving component; 7. First guide channel; 8. Second guide channel; 9. Drive shaft; 10. Roller;

[0034] 11. Protrusion; 12. First rack; 13. Second rack; 14. Limiting groove; 15. Limiting protrusion;

[0035] 16. Second opening; 17. First connecting part; 18. Second connecting part; 19. Second shaft hole. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0037] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] Most existing watch straps use a fixed length design. This design cannot be adjusted to accommodate different wrist sizes, resulting in watches that are too tight or too loose for some users, affecting wearing comfort and stability. Furthermore, the fixed strap length limits the watch's adaptability to different wrist sizes, reducing product versatility and user experience.

[0041] Therefore, this application provides a watch strap end link with adjustable function. By setting a first end link, a second end link, and an adjustment mechanism (including a drive component), the overall length of the watch strap end link can be dynamically adjusted. In this way, users can flexibly adjust the tightness of the watch strap according to their wrist size, thereby improving wearing comfort and watch fit.

[0042] In some embodiments, refer to Figures 1 to 6As shown, this application provides a watch strap end link, including: a first end link 1, a second end link 2, and an adjustment mechanism 3. The first end link 1 has a receiving cavity 4, and the receiving cavity 4 has a first opening 5 on one side in the length direction X; the second end link 2 can extend and retract within the receiving cavity 4 through the first opening 5; the adjustment mechanism 3 includes a driving member 6, which is connected to the second end link 2 and exposed on one side of the first end link 1 in the width direction Y, and the driving member 6 is used to drive the second end link 2 to extend and retract.

[0043] The first end link 1 serves as the fixing part of the watch band end link and can be used to connect to the watch main unit. The interior of the first end link 1 forms a receiving cavity 4 for accommodating the second end link 2. This receiving cavity 4 has a first opening 5 on one side in the length direction X. Through this opening, the second end link 2 can extend or retract from the receiving cavity 4 in the width direction Y. Therefore, the first end link 1 provides a guiding and supporting sliding space for the second end link 2, allowing its position to be adjusted to accommodate different wrist sizes. Furthermore, the first end link 1 can be made of materials such as metal or plastic, ensuring both durability and lightweight.

[0044] The second end link 2, as the movable part of the watchband end link, can be used to connect to the front end of the watchband. The second end link 2 can extend and retract within the receiving cavity 4 through the first opening 5 of the first end link 1, forming a variable length structure, thereby changing the effective length of the entire watchband end link. This design allows users to adjust the length of the watchband according to their wrist size, thus improving wearing comfort.

[0045] The driving component 6 of the adjustment mechanism 3 is exposed on the Y-side of the first end link 1 for easy user operation and is used to drive the second end link 2 to extend and retract. Users can precisely adjust the position of the second end link 2 by operating the driving component 6, thereby changing the overall length of the watch strap to accommodate different wrist sizes and improve the wearing experience. The driving component 6 in this embodiment can take various forms, such as a knob, lever, or other mechanical structures.

[0046] Understandably, by placing the drive element 6 on the outer side of the first end link 1, users can easily touch and operate the drive element 6 with their fingers while wearing the watch, without needing a special angle or posture, thus improving the convenience of adjusting the watch band length. Furthermore, compared to placing the drive element 6 directly on the top of the first end link 1, placing it on the side reduces the impact on the watch band's appearance, maintaining the watch's overall aesthetics and smooth lines. It also helps to prevent accidental touches and damage from external impacts, improving durability. In addition, it does not add extra thickness to the end link, facilitating a thinner design.

[0047] During adjustment, the user can manually operate the drive component 6 to drive the second end piece 2 to extend or retract in the receiving cavity 4 of the first end piece 1. By controlling the extension length of the second end piece 2, the overall length of the watch strap end piece can be adjusted, so that the watch strap can adapt to the wearing needs of different users' wrists, avoid being too tight and compressing the skin or too loose and causing shaking, and improve wearing comfort.

[0048] Therefore, this embodiment of the application effectively solves the problem that traditional fixed watch straps are difficult to adapt to different wrists by setting a telescopic second end link 2 and an external driving adjustment mechanism 3 in the end link of the watch strap, improves the wearing experience, and has the characteristics of simple structure, efficient, convenient and safe operation.

[0049] In some embodiments, refer to Figures 1 to 6 As shown, the first headpiece 1 has a first guide channel 7 and a second guide channel 8 on one side of the width direction Y. The second guide channel 8 is connected between the accommodating cavity 4 and the first guide channel 7, and both the first guide channel 7 and the second guide channel 8 extend along the direction of the extension and retraction of the second headpiece 2 (i.e., the width direction Y). The driving component 6 is a knob, and the adjustment mechanism 3 also includes a transmission shaft 9 and a roller 10. One end of the transmission shaft 9 is rotatably connected to the second headpiece 2, and the other end of the transmission shaft 9 passes through the second guide channel 8 and the first guide channel 7 and is fixedly connected to the knob. The roller 10 is fixedly sleeved on the transmission shaft 9 and can roll in the second guide channel 8.

[0050] The first guide channel 7 and the second guide channel 8 can be strip-shaped channels. The first guide channel 7 provides a moving channel for the drive shaft 9, serving as a guide and limiter to ensure that the drive shaft 9 and the second headstock 2 move in the same direction. Similarly, the second guide channel 8 provides a moving channel for the roller 10, serving as a guide and limiter to ensure that the roller 10 and the second headstock 2 also move in the same direction. This effectively improves the adjustment accuracy. The drive shaft 9 is mainly used to transmit rotational power and drive the roller 10 and the second headstock 2 to move. The drive component 6 is a knob, which is fixedly connected to the exposed end of the drive shaft 9 for easy user operation.

[0051] During adjustment, the user manually rotates the knob, which transmits the rotational action to the drive shaft 9 fixed to it. The drive shaft 9 rotates accordingly, causing the roller 10 on the drive shaft 9 to roll within the second guide channel 8. During this process, the roller 10 and the second guide channel 8 generate rolling friction, thereby effectively converting the rotational force into the power to push the drive shaft 9 forward or backward. This allows the drive shaft 9 to make corresponding linear movements in the first guide channel 7, thereby pushing the second end link 2 so that it can extend and retract within the receiving cavity 4 of the first end link 1. This changes the overall length of the watch strap end link.

[0052] Therefore, the embodiments of this application are easy to operate by turning the knob, and can achieve stepless adjustment, thereby improving the wearing fit and meeting the wearing needs of different users.

[0053] In some embodiments, refer to Figure 6 As shown, the surface of the roller 10 is provided with a plurality of raised strips 11 spaced apart, and each raised strip 11 extends along the axial direction of the roller 10.

[0054] By providing multiple axially extending ridges 11 on the surface of the roller 10, rolling friction can be increased, thereby enhancing transmission efficiency. When the user turns the knob, the roller 10 can more efficiently convert rotational force into linear thrust, driving the drive shaft 9 to make precise linear movements.

[0055] Understandably, without the raised rib 11, if the surface of the roller 10 were too smooth, slippage would occur, making adjustment difficult or preventing the desired length adjustment from being achieved. The raised rib 11, however, increases rolling friction, effectively reducing the possibility of slippage and maintaining good power transmission performance.

[0056] Therefore, the present application embodiment optimizes the transmission efficiency by designing the raised strip 11 on the surface of the roller 10, so that the user can easily adjust the end links of the watch strap by turning the knob.

[0057] In some embodiments, refer to Figure 6 As shown, the surface of the protrusion 11 is an arc surface.

[0058] The curved design of the raised strip 11 allows the roller 10 to pass more smoothly through the second guide channel 8 during rolling, avoiding jamming or jumping caused by sharp edges, thus improving the smoothness of rolling. Because the rolling process is smoother and more fluid, users will find it easier and more convenient to adjust the length of the watch strap links.

[0059] In other embodiments, the first head piece 1 has a first guide channel 7 connected to the accommodating cavity 4 on one side of the width direction Y, and the first guide channel 7 extends along the direction of the extension and retraction movement of the second head piece 2; the driving member 6 is a push-pull member, and the adjustment mechanism 3 also includes a transmission shaft 9, one end of the transmission shaft 9 is fixedly connected to the second head piece 2, and the other end of the transmission shaft 9 passes through the first guide channel 7 and is fixedly connected to the push-pull member.

[0060] The first guide channel 7 can be a strip-shaped channel, providing a moving path for the drive shaft 9, serving as a guide and limiting element to ensure that the drive shaft 9 moves in the same direction as the second end piece 2. One end of the drive shaft 9 is fixedly connected to the second end piece 2, ensuring that the second end piece 2 can move together with the drive shaft 9. The other end of the drive shaft 9 passes through the first guide channel 7 and is fixedly connected to an external push-pull component, allowing the action of the push-pull component to be directly converted into linear motion of the drive shaft 9. The push-pull component serves as the user's operating end, used to directly apply push-pull force and transmit it to the drive shaft 9. This application does not impose any particular limitation on the specific type of push-pull component; for example, it can be a lever, a paddle, a block, or other similar structure.

[0061] During adjustment, the user manually pushes or pulls the push-pull component, causing it to move along the direction of the first guide channel 7. The movement of the push-pull component drives the drive shaft 9 to move linearly within the first guide channel 7. Since one end of the drive shaft 9 is fixedly connected to the second end link 2, the linear movement of the drive shaft 9 directly drives the second end link 2 to extend and retract within the receiving cavity 4. Furthermore, based on the distance the push-pull component is pushed or pulled, the extension or retraction length of the second end link 2 can be precisely controlled, thereby achieving adjustment of the overall length of the watch strap end link.

[0062] It is understandable that, compared with the knob-type adjustment of the aforementioned embodiments, the operation of the push-pull component in this application embodiment is more intuitive and direct. Users can simply push or pull to complete the adjustment. Furthermore, this design eliminates structures such as the roller 10 and the second guide channel 8, simplifying the internal structure and reducing manufacturing costs and failure rates.

[0063] In some embodiments, refer to Figures 1 to 4 As shown, the bottom of the accommodating cavity 4 is provided with first racks 12 on both sides of the width direction Y, and the first racks 12 extend along the direction of the extension and retraction of the second head piece 2; the second head piece 2 is provided with second racks 13 on both sides of the width direction Y, and each second rack 13 is meshed with each first rack 12 in a one-to-one correspondence.

[0064] The first rack 12 can be integrally formed on both sides of the bottom of the accommodating cavity 4, which can provide a track for the second rack 13 with double-sided support, further increasing the balance and stability of the second head 2 when it moves and reducing the possibility of deflection.

[0065] During adjustment, the user drives the second head piece 2 to extend and retract within the accommodating cavity 4 via the drive component 6. During this process, the second racks 13 on both sides of the second head piece 2 will move synchronously along the first rack 12. Since the two are meshed, it can be ensured that the second head piece 2 moves along the rack trajectory.

[0066] Furthermore, the cooperative design of the first rack 12 and the second rack 13 not only provides guidance but also serves a limiting function. Specifically, once the second end piece 2 is adjusted to the desired position, due to the tight meshing between the racks, the second end piece 2 will not easily shift unless sufficient external force is applied to overcome the friction between the teeth, thus ensuring the stability after adjustment. Through the locking effect of the racks, the risk of the second end piece 2 moving on its own due to minor collisions or pulling during daily activities is reduced, enhancing the safety and reliability of wearing the garment.

[0067] In addition, to reduce wear problems during long-term use, a self-lubricating coating, such as PTFE (polytetrafluoroethylene) coating, can be added to the meshing surfaces of each rack to reduce the coefficient of friction and improve smoothness of operation.

[0068] Therefore, the embodiments of this application provide a precise and stable adjustment method for the watch strap links through the rack and pinion meshing design, greatly improving the product's practicality and user experience. It effectively solves the problem that traditional fixed watch straps cannot adapt to different wrist sizes, while ensuring stability after adjustment and avoiding unnecessary displacement risks.

[0069] In some embodiments, refer to Figure 2 As shown, the tooth depth of the first rack 12 and the second rack 13 is 0.5 to 1.5 mm.

[0070] If the tooth depth is too shallow, the meshing between the teeth will not be tight enough, making it easy for the second tooth (2) to accidentally shift when subjected to external force. This will weaken the stability of the system, especially during daily activities or sports, where even slight impacts could cause adjustment failure. Conversely, if the tooth depth is too large, more force is required to create relative movement between the teeth. For the user, this means that adjusting the strap length will become strenuous and uncomfortable, especially when frequent adjustments are needed, resulting in a poor user experience.

[0071] Therefore, the tooth depth of 0.5 to 1.5 mm chosen in this embodiment ensures sufficient limiting strength while allowing the user to easily complete the adjustment with appropriate force. This prevents the locking function from being lost due to excessively shallow tooth depth, and also avoids operational difficulties due to excessively deep tooth depth.

[0072] In some embodiments, refer to Figure 2 , Figure 5 and Figure 6 As shown, the top wall of the accommodating cavity 4 is provided with a limiting groove 14, and the top of the second head 2 is provided with a limiting protrusion 15. The limiting protrusion 15 is telescopically movable within the limiting groove 14.

[0073] The limiting groove 14 is integrally formed on the top wall of the receiving cavity 4 and extends along the direction of extension and retraction of the second head piece 2, providing a track for receiving and guiding the limiting protrusion 15 of the second head piece 2. The limiting protrusion 15 may be integrally formed on the top of the second head piece 2, and its shape matches the limiting groove 14.

[0074] When the user drives the second head piece 2 to extend and retract via the drive component 6, the limiting protrusion 15 moves synchronously within the limiting groove 14. This provides additional guidance, ensuring that the second head piece 2 can move smoothly along the extension and retraction path, avoiding deviation or wobbling.

[0075] Therefore, the design of the limiting groove 14 and the limiting protrusion 15 in this embodiment effectively enhances the stability of the second head 2 during movement.

[0076] In some embodiments, refer to Figure 2 and Figure 3 As shown, a second opening 16 is provided between the first toothed racks 12 on both sides of the bottom of the accommodating cavity 4. This design can reduce interference with the movement of the second head piece 2, making its movement smoother, improving the movement performance of the second head piece 2, and helping to improve the ease of operation.

[0077] In some embodiments, refer to Figure 1 and Figure 2 As shown, the first end piece 1 has a first connecting part 17 on the side facing away from the first opening 5, and the first connecting part 17 is used to rotate and connect the main body of the watch; the second end piece 2 has a second connecting part 18 on the side away from the receiving cavity 4, and the second connecting part 18 is used to rotate and connect the watch strap of the watch.

[0078] The first connecting part 17 can be integrally formed on the side of the first end piece 1 facing away from the first opening 5. The first connecting part 17 is provided with a first shaft hole. A bracket can be provided at the bottom of the watch main body. The bracket can be rotatably connected to the first shaft hole through the first pivot, so that the first end piece 1 and the watch main body can rotate to a certain extent.

[0079] The second connecting part 18 can be integrally formed on the outer side of the second end link 2 away from the receiving cavity 4. The second connecting part 18 is provided with a second shaft hole 19. The front end of the watch strap can be rotatably connected to the second shaft hole 19 through the second pivot, so that the second end link 2 and the watch strap can rotate to a certain extent.

[0080] This application embodiment provides a first connecting part 17 and a second connecting part 18 on the first end piece 1 and the second end piece 2 respectively, and adopts a rotating connection design, which allows the user to flexibly adjust the angle according to their wrist shape so that the entire watch fits the wrist, thereby improving the wearing comfort.

[0081] In some embodiments, this application also provides a watch, including a main unit, a watch strap, and watch strap links as described in the above embodiments. The main unit is connected to a first connecting portion 17 of a first link 1, and the watch strap is connected to a second connecting portion 18 of a second link 2. The specific type of watch in this application is not particularly limited; for example, it can be a mechanical watch, a smartwatch (such as a children's watch), etc.

[0082] Since the watch provided in this application includes the watch strap end links of the above embodiments, it has all the technical effects of the watch strap end links of the above embodiments, which will not be repeated here.

[0083] The above are merely preferred embodiments of this application and are not intended to limit the embodiments of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A band head grain, characterized by, include: The first end piece is provided with a receiving cavity, and the receiving cavity has a first opening on one side in the length direction; The second end piece is capable of telescopic movement within the accommodating cavity through the first opening; The adjustment mechanism includes a drive member connected to the second headpiece and exposed on one side of the first headpiece in the width direction. The drive member is used to drive the second headpiece to extend and retract.

2. The band head grain of claim 1, wherein, The first headpiece has a first guide channel and a second guide channel on one side in the width direction. The second guide channel is connected between the receiving cavity and the first guide channel, and both the first guide channel and the second guide channel extend in the direction of the extension and retraction of the second headpiece. The driving component is a knob, and the adjustment mechanism also includes a drive shaft and a roller. One end of the drive shaft is rotatably connected to the second headstock, and the other end of the drive shaft passes through the second guide channel and the first guide channel and is fixedly connected to the knob. The roller is fixedly sleeved on the drive shaft and can roll in the second guide channel.

3. The band head grain of claim 2, wherein, The surface of the roller is provided with a plurality of raised strips spaced apart, and each of the raised strips extends along the axial direction of the roller.

4. The band head grain of claim 3, wherein, The surface of the convex strip is curved.

5. The band head grain of claim 1, wherein, The first head piece has a first guide channel communicating with the accommodating cavity on one side in the width direction, and the first guide channel extends along the direction of the extension and retraction movement of the second head piece; The driving component is a push-pull component, and the adjustment mechanism further includes a transmission shaft. One end of the transmission shaft is fixedly connected to the second headstock, and the other end of the transmission shaft passes through the first guide channel and is fixedly connected to the push-pull component.

6. The band head grain according to any one of claims 1 to 5, characterized in that, The bottom of the accommodating cavity is provided with first toothed racks on both sides in the width direction, and the first toothed racks extend along the direction of the extension and retraction of the second head piece; The second head piece has a second toothed rack on each side in the width direction, and each second toothed rack is meshed with each first toothed rack in a one-to-one correspondence.

7. The band head grain of claim 6, wherein, The tooth depth of the first rack and the second rack is 0.5 to 1.5 mm.

8. The band head of claim 1, wherein, The top wall of the accommodating cavity is provided with a limiting groove, and the top of the second head is provided with a limiting protrusion. The limiting protrusion is retractably and movable within the limiting groove.

9. The band head of claim 1, wherein, The first headpiece has a first connecting part on the side facing away from the first opening, and the first connecting part is used to rotate and connect to the main body of the watch. The second end piece has a second connecting part on the side away from the receiving cavity, and the second connecting part is used to rotate and connect the watch strap.

10. A watch characterized by The watch includes a main unit, a watch band, and a watch band head link as described in any one of claims 1 to 9, wherein the main unit is connected to the first head link, and the watch band is connected to the second head link.

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