WO2022156725A1

WO2022156725A1 - Watch

Info

Publication number: WO2022156725A1
Application number: PCT/CN2022/072863
Authority: WO
Inventors: 张亮
Original assignee: 维沃移动通信有限公司
Priority date: 2021-01-22
Filing date: 2022-01-20
Publication date: 2022-07-28
Also published as: CN112890386B; CN112890386A

Abstract

A watch, comprising a body (1), which is provided with a watch strap accommodating cavity (13); a watch dial (2), which is rotatably provided on the body (1); a watch strap (5), which is at least partly provided within the watch strap accommodating cavity (13) and is slidably connected to the body (1); and a transmission mechanism (3), the watch dial (2) being transmissively connected to the watch strap (5) via the transmission mechanism (3). Insofar as the watch dial (2) is rotating, the watch dial (2) drives a gear shaft (4) to rotate via the transmission mechanism (3), thus driving the watch strap (5) to be retracted into or extended from the watch strap accommodating cavity (13).

Description

a watch

cross reference

The present invention claims the priority of the Chinese patent application with the application number 202110094217.3 and the invention name "a watch" filed with the China Patent Office on January 22, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of electronic devices, and in particular, to a watch.

Background technique

With the advancement of 5G communication technology, the consumer electronics industry is booming, and more and more manufacturers have proposed the Internet of Things (IoT) strategy, striving to build a product ecosystem of their own brands. In this wave, traditional watches have also begun to transform into smart watches, entering the product matrix of more and more brands. In addition, the design of smart watches is in line with the concept of healthy life, making consumers more willing to buy smart watches. getting stronger.

At present, the straps of most smart watches are mostly divided into two straps, long and short. The straps are connected with the main body. One strap is provided with card protrusions, and the other strap is provided with multiple card holes. The card protrusions are connected to different The length of the strap can be adjusted on the card hole. However, the card holes on the watch band are arranged at intervals and cannot be arranged continuously, so that when the watch band is worn on the wrist, the upper holes are loose and the lower holes are tight, resulting in poor user experience.

SUMMARY OF THE INVENTION

The embodiment of the present disclosure provides a wrist watch to solve the problem that the existing watch strap clip holes are arranged at intervals, and the watch strap cannot be adjusted to an appropriate length.

In order to solve the above problems, the present disclosure adopts the following technical solutions:

An embodiment of the present disclosure provides a watch, including:

a body, the body has a accommodating cavity;

a dial, which is rotatably arranged on the body;

A watch band, at least part of the watch band is arranged in the accommodating cavity, and the watch band is slidably connected with the body;

a transmission mechanism, the dial is connected with the watch band through the transmission mechanism;

When the dial rotates, the dial drives the watch band to retract into or extend out of the accommodating cavity through the transmission mechanism.

The technical solutions adopted in the embodiments of the present disclosure can achieve the following beneficial effects:

When the watch of the present application is worn, by twisting the dial with one hand, the watchband will slide out and extend from the watchband accommodating cavity in the body, which is convenient for the user to take off. After the user wears the strap with one hand, by twisting the dial in the opposite direction, the length of the strap can be adjusted to adapt to the size difference of the consumer's wrist. For different consumers, all the excess straps are retracted into the strap accommodating cavity, and the appearance of the watch is high in aesthetics and consistency.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the attached image:

Fig. 1 is the three-dimensional structure schematic diagram of the watch provided by the embodiment of the application;

Fig. 2 is the exploded structure schematic diagram of the watch provided by the embodiment of the application;

3 is a schematic structural diagram of a middle frame of a wristwatch provided by an embodiment of the present application;

4 is a schematic diagram of the first transverse cross-sectional structure of the wristwatch provided by the embodiment of the application;

Fig. 5 is the second transverse cross-sectional structural schematic diagram of the watch provided by the embodiment of the application;

6 is a first partial longitudinal cross-sectional view of the wristwatch provided by the embodiment of the application;

7 is a second partial longitudinal cross-sectional view of the wristwatch provided by the embodiment of the application;

Fig. 8 is an enlarged view of part A in Fig. 7;

9 is a schematic diagram of the assembly structure of the middle frame and the back cover of the watch provided by the embodiment of the application;

10 is a bottom view of the wristwatch provided by the embodiment of the application;

FIG. 11 is a structural view of FIG. 10 with the watch band and the back cover removed.

In the picture:

1. Main body; 11. Middle frame; 111. First through-slot; 112. Second through-slot; 113. Bottom wall of middle frame; 12. Back cover; 121. First ring wall; 122a, the second side wall; 123, the guide post; 13, the watchband accommodating cavity; 131, the guide rail part; 131a, the first section; 131b, the second section; 131c, the transition section; screen; 2, dial; 3, transmission mechanism; 31, gear part; 32, transmission rod; 33, driving wheel; 4, gear shaft; 5, strap; 51, slider; 52, meshing part; 6, preload Roller; 7. Worm bearing; 8. Flat bearing; 9. Internal space of watch; 10. Screw.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below with reference to the specific embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only some, but not all, embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

The terms "first", "second", etc. in the description and claims of the present disclosure are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that embodiments of the present disclosure can be practiced in sequences other than those illustrated or described herein. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the associated objects are in an "or" relationship.

The technical solutions disclosed by the various embodiments of the present disclosure will be described in detail below with reference to FIGS. 1 to 11 .

Referring to FIG. 1 , FIG. 2 and FIG. 7 , an embodiment of the present application provides a watch, including a body 1 , a dial 2 , a transmission mechanism 3 and a watch strap 5 . Various functional modules of the watch are installed on the main body 1 , for example, a battery, a display screen 14 , a circuit board and the like are installed on the main body 1 . The body 1 has a watchband accommodating cavity 13, and the dial 2 is rotatably arranged on the body 1. For example, the dial 2 is rotatably mounted on the body 1 through a plane bearing 8 (see FIG. 6). The watchband 5 is at least partially arranged in the watchband accommodating cavity 13, and the watchband 5 is slidably connected to the body 1; the dial 2 is connected to the watchband 5 through the transmission mechanism 3; When the dial 2 rotates, the dial 2 drives the strap 5 to retract or extend into the accommodating cavity 13 through the transmission mechanism 3 . When the dial 2 rotates around the first direction, the dial 2 drives the gear shaft 4 to rotate through the transmission mechanism 3, so as to drive the watch band 5 to retract into the watch band accommodating cavity 13; When the dial 2 rotates in the second direction, the dial 2 drives the gear shaft 4 to rotate through the transmission mechanism 3 to drive the watch band 5 to extend out of the watch band accommodating cavity 13 . Wherein, the first direction and the second direction are opposite directions. When the user wears the watch, if he wants to take off the watch, he only needs to turn the dial 2, and the transmission mechanism 3 can drive the strap 5 to extend out of the accommodating cavity 13, and the user can easily take off the watch. If the user needs to wear the watch, first put the watchband 5 on the wrist and turn the dial 2, and then drive the watchband 5 to retract into the accommodating cavity 13 through the transmission mechanism 3, so that the length of the watchband 5 outside the watch is shortened, and the watch can be worn. At the same time, according to the wearing habits of different users, the length of the strap 5 outside the watch can be adjusted to obtain the most comfortable wearing length. Wherein, the transmission mechanism 3 for drivingly connecting the dial 2 and the strap 5 is not limited to the content introduced in this application, such as a belt drive and other structures, and can rotate the dial 2 to make the strap 5 extend or retract into the accommodating cavity 13 structure within.

Optionally, the transmission mechanism 3 includes a gear part 31 , a transmission rod 32 , a driving wheel 33 and a gear shaft 4 , the gear shaft 4 is rotatably arranged in the accommodating cavity, and the watch band 5 is provided with The meshing part 52, the watch band 5 meshes with the gear shaft 4 through the meshing part 52; the dial 2 is provided with a ring gear part along the circumferential direction, and the gear part 31 is in phase with the ring gear part. Meshing, the transmission rod 32 is connected with the gear part 31 , the driving wheel 33 is connected with the gear shaft 4 ; the transmission rod 32 is connected with the driving wheel 33 in a driving manner. By rotating the dial 2 , the ring gear part can drive the gear part 31 to rotate, and the gear part 31 drives the transmission rod 32 and the driving wheel 33 to rotate in turn. A plurality of protruding teeth are provided on the peripheral side of the gear shaft 4 , each protruding tooth is distributed along the circumferential direction of the gear shaft 4 , and each protruding tooth is extended along the length direction of the gear shaft 4 . The gear shaft 4 is connected to the drive wheel 33 . The driving wheel 33 is connected to the transmission rod 32 in a driving manner, and the rotation of the transmission rod 32 can drive the driving wheel 33 to rotate. The watch band 5 is provided with a meshing portion 52 . The meshing portion 52 includes a plurality of protruding teeth. Each protruding tooth is distributed along the length direction of the watch band 5 . .

Optionally, the transmission rod 32 is a worm, the driving wheel 33 is a worm wheel, and the worm and the worm wheel are engaged. Referring to FIG. 5 , it is another cross-sectional view of the main body 1 further down relative to FIG. 4 , and the cross-sectional view shows the transmission layout of the worm, the worm gear, and the gear shaft 4 . The worm, the worm gear and the gear shaft 4 are all symmetrically distributed in the body 1. The rotation of the worm installed on the four corners of the body 1 will drive the matched worm gear to rotate, and the worm gear and worm change the direction of transmission. The worm gear and the gear shaft 4 are connected by a key, and the rotation of the worm gear drives the gear shaft 4 to rotate. The key points of the layout in Figure 5 are the rotation directions of the worm at different positions and the matching orientation of the worm gear relative to the worm. Driven by the rotation of the dial 2, the four gear parts 31 rotates in the same direction, and drives the four worms to rotate in the same direction. The analysis shows that when each worm keeps the steering unchanged, the rotation directions of the worm gears on both sides of the body 1 are opposite. In FIG. 5 , the gear shafts 4 on the left and right sides are driven by the worm gear to rotate in the opposite direction, so that when the dial 2 is rotated, the two ends of the strap 5 are retracted into or withdrawn from the strap accommodating cavity 13 of the main body 1 at the same time, thereby The adjustment speed of the strap 5 has been improved.

Optionally, the number of the transmission mechanisms 3 is 2, and the two transmission mechanisms 3 are respectively arranged at both ends of the gear shaft 4, and the two ends of the gear shaft 4 are respectively connected with a drive wheel 33, The drive wheels 33 on the body corresponding to the two ends of the gear shaft 4 are respectively provided with corresponding transmission mechanisms 3 . That is, the gear shaft 4 has two driving wheels 33 , and the two driving wheels 33 are located at both ends of the gear shaft 4 . The main body 1 is provided with two transmission mechanisms 3 corresponding to the two driving wheels 33 , and the transmission rods 32 on the two transmission mechanisms 3 are respectively connected to the two driving wheels 33 in a driving manner, so as to realize the simultaneous supply of the gear shaft 4 on both sides. The driving force ensures the stability of the transmission structure.

Optionally, the body 1 is provided with a first port portion and a second port portion that communicate with the strap accommodating cavity 13, and the body 1 is provided with a corresponding first port portion and the second port portion respectively. Corresponding transmission mechanism 3, both ends of the watch band 5 are respectively protruded into the watch band accommodating cavity 13 through the first port and the second port, and the two ends of the watch band 5 are respectively connected with the watch band 5. The transmission mechanism 3 is connected. In this embodiment, the body 1 is provided with a total of four transmission mechanisms 3 for the two gear shafts 4 . The watch strap 5 can be an integrated watch strap, as shown in FIG. 4 , which is a cross-sectional view of the main body 1 . It can be seen from the figure that the dial 2 is integrally formed with a ring gear, and the dial 2 is provided with four symmetrically distributed The gear parts 31 are respectively the gear parts 31 on the four transmission mechanisms 3 , and the four gear parts 31 can be driven to rotate by rotating the dial 2 . Specifically, the two ends of the strap 5 are respectively connected to the gear shaft 4 through the first port and the second port. The gear shaft 4 can be rotated by rotating the dial 2 , thereby driving the strap 5 to retract into or extend out of the accommodating cavity 13 . .

Optionally, as shown in FIG. 2 , both sides of the first port and the second port are provided with guide posts 123 . During the process of retracting or extending the watch band 5 into the watch band accommodating cavity 13 , the guide posts 123 It plays the role of guiding the movement of the watch band 5 and prevents the watch band 5 from shifting.

Optionally, as shown in FIG. 6 , the body 1 is provided with a worm bearing 7 , and the worm is connected to the worm bearing 7 .

Specifically, the body 1 includes a back cover 12 and a middle frame 11 , the back cover 12 and the middle frame 11 are fastened together, and a watchband accommodating cavity 13 is formed therebetween. The rear cover 12 is provided with a worm bearing 7 , and the middle frame 11 may also be provided with a worm bearing 7 . Both ends of the worm are connected to the worm bearing 7 on the rear cover 12 and the middle frame 11 respectively. The middle frame 11 is provided with two convex portions on both sides of the first opening, and two convex portions are also provided on both sides of the second opening. The middle frame 11 is provided with a total of four convex portions, each of which is outside. Cavities are respectively provided in the convex parts for accommodating the transmission mechanism 3 .

Referring to FIG. 6 , a partial longitudinal sectional view of the main body 1 is shown. The dial 2 is installed on the middle frame 11 and is supported by the annular plane bearing 8. The dial 2 can rotate freely under the action of the plane bearing 8. The lower part of the dial 2 is processed into a ring gear structure, the ring gear structure and the gear of the transmission mechanism 3 When the user twists the dial 2, the ring gear structure on the dial 2 drives each gear part 31 to rotate, and the worm is positioned by the upper and lower worm bearings 7. The gear part 31 and the worm can be driven by key cooperation, the rotation of the worm drives the worm wheel to rotate, and the worm wheel and the gear shaft 4 are matched by a key to drive the gear shaft 4 to rotate.

In the design of the transmission ratio of the mechanism, the ring gear structure on the dial 2 has a large reduction ratio relative to the gear part 31 on the transmission mechanism 3. By twisting the dial 2 by a little angle, the gear part 31 can drive the worm to rotate a lot. The transmission between the worm gear and the worm is also a large reduction ratio. The worm rotates many times before the worm can rotate once. The combination of the two processes can match the ratio of the rotation angle of the dial 2 and the rotation angle of the gear shaft 4, so that the dial 2 can be rotated by hand. There is a comfortable watch band 5 retraction speed, which can increase the efficiency of watch band 5 retraction and improve the quality of experience for consumers.

During the transmission process from manually twisting the dial 2 to the expansion and contraction of the strap 5, the transmission link from the worm to the worm gear is one-way, and the worm can only rotate when the worm rotates. The advantage of this design is that the length of the strap 5 can only be changed by manually twisting the dial 2. When the watch is worn, the movement of the wrist and the external pulling on the strap 5 will not make the watch loose. Enhanced wearing stability and comfort.

Optionally, as shown in FIG. 2 , FIG. 7 and FIG. 8 , a guide rail part 131 is provided on the inner wall of the watchband accommodating cavity 13 ; part of the watchband 5 can be slidably matched with the guide rail part 131 ; When the dial 2 is rotated, the watch band 5 retracts into or extends out of the accommodating cavity 13 along the guide rail portion 131 . Specifically, the watch band 5 is provided with a slide bar 51 , and the slide bar 51 is slidably fitted with the guide rail portion 131 . The guide rail portion 131 and the slider 51 can cooperate to lead to the sliding direction of the watch band 5, so as to avoid the position of the watch band 5 in the accommodating cavity 13 from changing after multiple adjustments, resulting in the watch band 5 being unable to smoothly retract or extend to accommodate Cavity 13. The fluency and accuracy of the length adjustment of the strap 5 extending out of the accommodating cavity 13 are increased, and the user experience is improved.

Referring to FIG. 8 , both sides of the slider 51 at the front end of the watchband 5 are matched with the guide rails 131 on both sides of the watchband accommodating cavity 13 . The guide rails 131 define the telescopic sliding direction of the watchband 5 . A wall and a side wall, on which the guide rail portion 131 is provided, the guide rail portion 131 includes a first section 131a extending along the upper surface of the bottom wall and a second section 131b higher than the bottom wall surface, so An upwardly convex transition section 131c is disposed between the first section 131a and the second section 131b. When the watch band 5 is retracted into the watch band accommodating cavity 13, at the transition section 131c, the slide bar 51 of the watch band 5 rises and slides along the guide rail portion 131, and the lower surface of the watch band 5 begins to separate from the bottom wall, thereby lowering the In order to reduce the frictional resistance during the expansion and contraction of the watch band 5, the guide rail portion 131 is fixed on the side wall, and its extending trajectory is a smooth curve, which can increase the expansion and contraction amount of the watch band 5. After optimizing the design, the expansion and contraction amount of the watch band 5 can be increased. It reaches 10cm, which makes the same strap 5 basically meet the wearing size requirements of most consumers.

Optionally, the guide rail portion 131 includes a first guide rail portion extending toward the first port portion and a second guide rail portion extending toward the second port portion, the first guide rail portion and the second guide rail portion along the The main body 1 is arranged at intervals up and down in the thickness direction; when the dial 2 is rotated, the two ends of the watch band 5 are respectively retracted or extended along the first guide rail part and the second guide rail part. accommodating cavity 13 . Both ends of the strap 5 protrude into the accommodating cavity 13 through the first port and the second port and are connected with the gear shaft 4 in a driving manner. , both ends of the watch band 5 retract into or extend out of the accommodating cavity 13 at the same time, which improves the efficiency of adjusting the length of the watch band 5 .

Optionally, as shown in FIG. 2 and FIG. 7 , a preload roller 6 is also provided in the watchband accommodating cavity 13 , and the preload roller 6 is parallel to the gear shaft 4 . 5 includes a first surface having an engaging portion 52 and a smooth second surface, the strap 5 passing through the gap between the preload roller 6 and the gear shaft 4, the first surface and the The gear shaft 4 is in contact, and the meshing portion 52 on the first surface meshes with the gear shaft 4 . The second surface is in contact with the preload roller 6 . The meshing portion 52 includes a plurality of protruding teeth arranged along the width direction of the first surface, and the gear shaft 4 includes a long shaft body. The length direction of the body is arranged, so that the watch band 5 and the gear shaft 4 are meshed. As shown in FIG. 7 , the gear shaft 4 meshes with the meshing portion 52 on the watch band 5, and the reverse movement of the gear shaft 4 on both sides of the watch band 5 can drive both sides of the watch band 5 to retract or extend the watch band at the same time. The accommodating cavity 13 is used to realize the expansion and contraction of the watch as a whole. The preload rollers 6 located at the mouths on both sides of the body 1 will rotate with each other during the movement of the watch band 5, which can not only guide the watch band 5 to slide toward the gear shaft 4, but also avoid the expansion and contraction of the watch band 5. Caton appears.

Optionally, as shown in FIG. 7 , the body 1 includes a rear cover 12 and a middle frame 11 , the middle frame 11 includes a middle frame bottom wall 113 , and the middle frame 11 is covered on the rear cover 12 . The strap accommodating cavity 13 is formed between the bottom wall 113 of the middle frame and the back cover 12 .

Specifically, as shown in FIG. 2 , the rear cover 12 includes a first annular wall 121 and a second annular wall 122 arranged at intervals. The first ring wall 121 and the second ring wall 122 are respectively provided with a straight first side wall 121a and a second side wall 122a, and the first side wall 121a and the second side wall 122a are provided with The rail portion 131 described above.

The middle frame bottom wall 113 is provided with a first through groove 111 and a second through groove 112 , the middle frame 11 is covered on the rear cover 12 , the middle frame bottom wall 113 and the first side wall 121 a and the second side wall 122a to form the watchband accommodating cavity 13 or form a part of the watchband accommodating cavity 13; the first through groove 111 communicates with the inner cavity of the first ring wall 121, and the The second through groove 112 communicates with the inner cavity of the second annular wall 122 .

Referring to FIG. 9 , which is a schematic diagram after the middle frame 11 and the back cover 12 are assembled, this solution can isolate the internal space of the body 1 into two independent spaces, which are the internal space 9 of the watch and the strap accommodating cavity 13 . The inner space 9 of the watch is composed of the space on both sides of the middle frame 11 and the back cover 12 , including the inner cavity of the middle frame 11 and the space in the two ring walls connecting the inner cavity of the middle frame 11 . The internal space 9 of the watch is sealed with the outside by means of glue, rubber ring, foam, etc., and serves as a stacking installation position for the internal components of the watch, and the watchband accommodating cavity 13 is set independently.

10 is a bottom wall view of the watch, and FIG. 11 is a bottom view of the watch after the back cover 12 and the strap 5 are removed. As can be seen from the figure, the rear cover 12 and the middle frame 11 are installed and fixed by eight symmetrical screws 10, which ensure the stability of the installation as a whole. On both sides of the worm, the worm undertakes the transmission process from the dial 2 to the expansion and contraction of the strap 5, and the stability of its rotational movement needs to be guaranteed. Movement stability improves product quality and prolongs service life.

The embodiments of the present disclosure have been described above with reference to the accompanying drawings, but the present disclosure is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of the present disclosure, without departing from the scope of the present disclosure and the protection scope of the claims, many forms can be made, which all fall within the protection of the present disclosure.

Claims

A watch comprising:

a body, the body has a accommodating cavity;

a dial, which is rotatably arranged on the body;

A watch band, at least part of the watch band is arranged in the accommodating cavity, and the watch band is slidably connected with the body;

a transmission mechanism, the dial is connected with the watch band through the transmission mechanism;

When the dial rotates, the dial drives the watch band to retract into or extend out of the accommodating cavity through the transmission mechanism.
The watch according to claim 1, wherein the transmission mechanism comprises a gear part, a transmission rod, a driving wheel and a gear shaft, the gear shaft is rotatably arranged in the accommodating cavity, and the watch band is provided with an engaging portion, through which the watch band is engaged with the gear shaft;

The dial is provided with a ring gear part along the circumferential direction, the gear part is meshed with the ring gear part, the transmission rod is connected with the gear part, and the driving wheel is connected with the gear shaft;

The transmission rod is in driving connection with the driving wheel.
The watch according to claim 2, wherein the transmission rod is a worm, the driving wheel is a worm wheel, and the worm and the worm wheel are engaged.
The wristwatch according to claim 2, wherein the number of the transmission mechanisms is 2, the two transmission mechanisms are respectively arranged at both ends of the gear shaft, and the two ends of the gear shaft are respectively connected with one of the drive mechanisms wheel;

The drive wheels on the body corresponding to the two ends of the gear shaft are respectively provided with the transmission mechanism.
The watch according to claim 1, wherein the body is provided with a first port and a second port that communicate with the watchband accommodating cavity;

Corresponding transmission mechanisms are respectively provided on the body corresponding to the first mouth portion and the second mouth portion;

Both ends of the watch band extend into the watch band accommodating cavity through the first port and the second port respectively, and the two ends of the watch band are respectively connected to the transmission mechanism.
The watch according to claim 5, wherein a guide rail portion is provided on the inner wall of the watchband accommodating cavity;

part of the watch band can be slidably matched with the guide rail part;

When the dial rotates, the watch band retracts into or extends out of the accommodating cavity along the guide rail portion.
The watch of claim 6, wherein the receiving cavity includes a bottom wall and a side wall;

the guide rail part is arranged on the side wall;

the guide rail portion includes a first segment extending along the upper surface of the bottom wall and a second segment higher than the upper surface of the bottom wall;

An upwardly convex guide segment is arranged between the first segment and the second segment.
The wristwatch of claim 6, wherein the rail portion includes a first rail portion extending toward the first port portion and a second rail portion extending toward the second port portion;

The first guide rail part and the second guide rail part are arranged at intervals up and down along the thickness direction of the main body;

When the dial rotates, both ends of the watch band retract into or extend out of the accommodating cavity along the first guide rail part and the second guide rail part, respectively.
The watch according to claim 2, wherein a preload roller is further provided in the watchband accommodating cavity;

the preload roller is parallel to the gear shaft;

the strap includes a first surface having an engaging portion and a smooth second surface;

The strap passes through the gap between the preload roller and the gear shaft, the first surface is in contact with the gear shaft, and the second surface is in contact with the preload roller.
The watch of claim 1, wherein the body includes a back cover and a middle frame;

The middle frame includes a middle frame bottom wall, the middle frame cover is provided on the back cover, and the watchband accommodating cavity is formed between the middle frame bottom wall and the back cover.
The watch according to claim 10, wherein the back cover comprises a first annular wall and a second annular wall arranged at intervals; the first annular wall and the second annular wall are respectively provided with straight first annular walls a side wall and a second side wall;

The bottom wall of the middle frame is provided with a first through groove and a second through groove;

The middle frame cover is provided on the back cover, and the middle frame bottom wall, the first side wall and the second side wall are enclosed to form the watchband accommodating cavity or form the watchband accommodating cavity The first through groove communicates with the inner cavity of the first annular wall, and the second through groove communicates with the inner cavity of the second annular wall.