Coaxial time division flyback structure
Through the design of the coaxial time-division flyback structure, the precise linkage between the hour hand and the minute hand is achieved, solving the problem of the inability to link the hour hand and the minute hand in the prior art, ensuring the accuracy and ornamentality of the watch.
Patent Information
- Application Number
- CN202422680607.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-11-04
AI Technical Summary
The existing time division flyback structure cannot realize the linkage between the hour hand and the minute hand, resulting in the accumulation of mechanical errors and inaccurate display.
The coaxial time-division flyback structure is adopted, and the hour hand drive gear and minute hand drive gear are arranged coaxially, and the minute hand flyback assembly and hour hand flyback assembly are used to ensure that the hour hand and minute hand accurately return to the initial position after rotating at a specific angle. The fitting of the fly part positioning cam and flyback gear achieves the precise rotation of the minute hand, and the fitting of the fly positioning elastic member and flyback gear achieves the 1/12 angle rotation of the hour hand.
The precise linkage between the hour and minute hands is achieved, which eliminates mechanical errors and ensures the accuracy and visual viewing of the clock.
Smart Images
Figure CN223284514U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of mechanical transmission of clocks and watches, and in particular to a coaxial hour-minute flyback structure. Background Art
[0002] The traditional field of watchmaking continues to evolve, with a growing number of innovative time display mechanisms emerging to meet the growing demand for diverse time display functions. Among these, the hour-minute flyback mechanism has garnered significant attention within the high-end watchmaking industry for its unique design and precise time control capabilities. This mechanism enables the hour and minute hands to periodically fly back, enhancing both visual appeal and practicality.
[0003] Most hour-minute flyback mechanisms currently available on the market rely primarily on basic mechanical principles to display time. Specifically, common traditional solutions typically control the hour and minute hands via two separate drive gears. While these solutions generally meet time display requirements, they have certain limitations in practical applications, making it impossible to achieve coordinated operation of the hour and minute hands. Utility Model Content
[0004] In order to realize the linkage between the hour hand and the minute hand, the present application provides a coaxial hour and minute flyback structure.
[0005] The coaxial time-division flyback structure provided in this application adopts the following technical solution:
[0006] A coaxial hour and minute flyback structure comprises a frame, an hour hand flyback assembly, a minute hand flyback assembly, an hour hand drive gear and a minute hand drive gear, wherein the hour hand drive gear is used to be connected to the hour hand on the dial, and the minute hand drive gear is used to be connected to the minute hand on the dial, the hour hand drive gear and the minute hand drive gear are coaxially arranged on the frame so as to be able to rotate around their own axes, the minute hand flyback assembly is used to drive the minute hand to rotate around its own axis, and after rotating by a first specific angle, return to an initial position while continuing to rotate around its own axis, and the hour hand flyback assembly is used to drive the hour hand to rotate around its own axis by a second specific angle of 1 / 12 when the minute hand returns to the initial position, and after rotating by the second specific angle, return to the initial position while continuing to rotate around its own axis.
[0007] By adopting this technical solution, the hour and minute hand drive gears are coaxially arranged and connected to the hour and minute hands on the dial, respectively. This ensures that each time the minute hand completes a first specified angle of rotation and returns to its initial position, the hour hand will also rotate 1 / 12 of a second specified angle. This design ensures the accuracy of the clock display and the coordinated movement of the hour and minute hands. Furthermore, each time the minute hand completes a first specified angle of rotation and returns to its initial position, the hour hand also completes a second specified angle of rotation and returns to its initial position. The flyback mechanism ensures that each flyback returns to its initial position, eliminating the mechanical errors accumulated over time due to continuous rotation.
[0008] Optionally, the minute hand flyback assembly includes a fly-cent input gear, a fly-cent positioning cam, a fly-cent return gear and a fly-cent return elastic member, the fly-cent input gear can be rotatably arranged on the frame plate around its own axis and is used to receive power, the fly-cent positioning cam is coaxially arranged with the fly-cent input gear and rotates synchronously, the fly-cent return gear can be rotatably arranged on the frame plate around its own axis and is engaged with the minute hand driving gear, the fly-cent return gear is provided with a receiving portion for abutting against the cam and a fly-cent dialing portion for abutting against the fly-cent return elastic member, one end of the fly-cent return elastic member is fixedly connected to the frame plate, and the other end abuts against the fly-cent dialing portion, the fly-cent return gear has an initial position and an extreme position, the fly-cent The fly-centre positioning cam is used to drive the fly-centre return gear to gradually move from the initial position to the limit position, and lose engagement with the fly-centre return gear at the limit position. When the fly-centre return gear is at the initial position, the fly-centre return elastic member is in a natural state. During the process of the fly-centre return gear gradually moving from the initial position to the limit position, the fly-centre return elastic member is gradually compressed. When the fly-centre return gear loses engagement with the fly-centre return gear at the limit position, the fly-centre return gear returns from the compressed state to the natural state, and is used to drive the fly-centre return gear to immediately return from the limit position to the initial position, and re-engage the fly-centre return gear with the fly-centre positioning cam.
[0009] By adopting the above technical solution, the fly-cent input gear in the minute hand flyback assembly receives power and transmits it to the fly-cent positioning cam. The fly-cent positioning cam drives the fly-cent return gear from its initial position to its limit position, where it loses engagement with the fly-cent return gear. At this point, the fly-cent return elastic member is in a compressed state. When this engagement is lost, the fly-cent return gear, under the action of the fly-cent return elastic member, immediately returns from its limit position to its initial position and re-engages with the fly-cent positioning cam. This enables the minute hand drive gear to precisely rotate the minute hand forward by a first specified angle and then quickly return to its initial position, and this process can be repeated continuously.
[0010] Optionally, the outer diameter of the flying-centre positioning cam continuously increases around the forward rotation direction of the flying-centre positioning cam and suddenly decreases to a minimum.
[0011] By adopting the above technical solution, the outer diameter design of the flying minute positioning cam enables the flying minute return gear to move smoothly from the initial position to the extreme position during the rotation of the flying minute positioning cam, and to return quickly when the outer diameter of the flying minute positioning cam suddenly decreases, ensuring that the minute hand quickly returns to the initial position after accurately completing the first specific angle rotation.
[0012] Optionally, the minute hand return gear drives the minute hand driving gear to rotate in a positive direction around its own axis by a first specific angle during the process of gradually moving from the initial position to the extreme position.
[0013] By adopting the above technical solution, it is ensured that the minute hand can rotate by the first specific angle and accurately return to the initial position and continue to rotate by the first specific angle in each cycle.
[0014] Optionally, the minute hand flyback assembly further includes a driving wheel, a fisheye column, a check wheel and a transmission wheel. The driving wheel and the transmission wheel are rotatable around their own axes and are arranged on the frame plate. The check wheel is sleeved on the fisheye column, and the apex of the fisheye column is arranged close to the driving wheel, so that the check wheel remains engaged with the driving wheel. The transmission wheel is arranged on the arc side of the fisheye column and is engaged with the flying minute input gear.
[0015] By adopting the above technical solution, the apex of the fisheye column is positioned near the driving wheel, ensuring that the check wheel always remains engaged with the driving wheel. As the driving wheel rotates in the forward direction, the check wheel, under the action of the driving wheel, tends to move closer to the transmission wheel on the fisheye column, meshing with the transmission wheel and transmitting power to the flywheel input gear through the transmission wheel, thus achieving efficient power transmission. As the driving wheel rotates in the reverse direction, the check wheel, under the action of the driving wheel, tends to move away from the transmission wheel on the fisheye column and disengage from the transmission wheel. This prevents the check wheel from transmitting power to the flywheel input gear through the transmission wheel, thus preventing reverse rotation of the flywheel input gear.
[0016] Optionally, the hour hand flyback assembly includes a flying time input gear, a flying time positioning elastic member, a flying time transmission gear, a flying time positioning missing gear, a flying time return gear, a flying time return limiter, a flying time return transmission gear and a flying time return elastic member. The flying time input gear and the flying time transmission gear are both rotatable around their own axes and are arranged on the frame plate. The flying time input gear is meshed with the flying time transmission gear. The flying time return gear is provided with a toggle hook for toggling the flying time input gear. One end of the flying time positioning elastic member is fixedly connected to the frame plate, and the other end abuts against the flying time input gear through a positioning step. The positioning step has a positive contact The contact surface and the reverse contact surface, the side adjacent to the positive contact surface and the reverse contact surface is a positioning edge, the surface that contacts the tooth surface of the flying input gear when the flying input gear rotates forward is the positive contact surface, and the surface that contacts the tooth surface of the flying input gear when the flying input gear rotates reversely is the reverse contact surface, the stroke of the positive contact surface is smaller than the stroke of the reverse contact surface, the flying positioning gear is coaxially arranged with the flying transmission gear and rotates synchronously, the flying positioning gear is meshed with the hour hand drive gear, and the flying return transmission gear is coaxially arranged with the hour hand drive gear and rotates synchronously, The flying return gear can be rotatably arranged on the frame plate around its own axis and meshes with the flying return transmission gear, the flying return gear is provided with a flying toggle portion for abutting against the flying return elastic member, one end of the flying return elastic member is fixedly connected to the frame plate, and the other end abuts against the flying toggle portion, the flying return gear has an initial position and an extreme position, the flying return limiting portion is arranged on the frame plate, and the flying return gear is provided with a limiting ridge for abutting against the flying return limiting portion, when the flying return gear is in the initial position, the limiting ridge abuts against the flying return limiting portion, the The flying time return transmission gear is used to drive the flying time return gear to gradually move from the initial position to the extreme position. When the flying time return gear is in the initial position, the flying time return elastic member is in a compressed state. During the process of the flying time return gear gradually moving from the initial position to the extreme position, the flying time return elastic member is further compressed. When the flying time return gear is in the extreme position, the flying time positioning missing gear loses engagement with the hour hand driving gear. The flying time return gear returns to a natural state from the compressed state and is used to drive the flying time return gear to immediately return from the extreme position to the initial position.
[0017] By employing the above-mentioned technical solution, the hour hand flyback assembly achieves periodic flyback motion of the hour hand. Specifically, the meshing design of the flytime input gear and the flytime transmission gear, as well as the toggle hook on the flytime return gear, ensures efficient power transmission. The flytime positioning elastic member, through the interaction of the positioning step with the flytime input gear, allows the flytime input gear to more easily cross the positioning ridge during forward rotation, thereby driving the hour hand drive gear to rotate by a specific angle of 1 / 12 of a second. Furthermore, the meshing of the flytime positioning gear with the hour hand drive gear, and the synchronous rotation of the flytime return transmission gear and the hour hand drive gear, ensure accurate rotation of the hour hand each time the minute hand returns to its initial position. The cooperation between the flytime return gear and the flytime return elastic member compresses the flytime return gear during its movement from its initial position to its limit position. Upon losing mesh with the flytime positioning gear at the limit position, the flytime return gear quickly returns to its original position, achieving rapid reset of the hour hand.
[0018] Optionally, during the process of the flying-minute return gear gradually moving from the initial position to the extreme position, the flying-hour toggle portion drives the flying-hour input gear to rotate in the opposite direction, and the stroke of the flying-hour input gear is smaller than the stroke of the reverse contact surface, so that the tooth top of the flying-hour input gear cannot cross the positioning ridge. During the process of the flying-minute return gear returning from the extreme position to the initial position, the flying-hour toggle portion drives the flying-hour input gear to rotate in the forward direction, and the stroke of the flying-hour input gear is larger than the stroke of the forward contact surface, so that the tooth top of the flying-hour input gear crosses the positioning ridge. When the flying-hour input gear rotates in the forward direction and crosses the positioning ridge, it can drive the hour hand driving gear to rotate around its own axis by 1 / 12 of a second specific angle.
[0019] By adopting the above technical solution, during the process of the flying-minute return gear gradually moving from the initial position to the extreme position, the flying-hour toggle part drives the flying-hour input gear to rotate in the opposite direction, and the stroke of the flying-hour input gear is smaller than the stroke of the reverse contact surface, so that the tooth top of the flying-hour input gear cannot cross the positioning ridge; during the process of the flying-minute return gear returning from the extreme position to the initial position, the flying-hour toggle part drives the flying-hour input gear to rotate in the forward direction, and the stroke of the flying-hour input gear is larger than the stroke of the forward contact surface, so that the tooth top of the flying-hour input gear can cross the positioning ridge, thereby driving the hour hand driving gear to rotate around its own axis by 1 / 12 of a second specific angle.
[0020] Optionally, the in-flight return limit portion includes an eccentric limit column, and the eccentric limit column is rotatably arranged on the frame plate around its own eccentric axis.
[0021] By adopting the above technical solution, the eccentric limit column can be rotatably arranged on the frame plate around its own eccentric axis, so that when the flying hour return gear returns from the extreme position to the initial position, it can cooperate with the eccentric limit column to achieve a more stable limiting effect, ensuring that the hour hand drive gear accurately returns to the initial position.
[0022] In summary, this application includes at least one of the following beneficial technical effects:
[0023] 1. The hour hand flyback assembly uses different stroke settings for the flyback input gear during forward and reverse rotation, allowing the hour hand drive gear to accurately rotate 1 / 12 of a second when the minute hand returns to its initial position, ensuring precise linkage between the hour and minute hands.
[0024] 2. The minute hand flyback assembly, through the coordination of the driving wheel, fisheye column, check wheel, and transmission wheel, prevents the reverse rotation of the flying minute input gear when the driving wheel rotates in the reverse direction, thereby preventing the reverse rotation of the flying minute positioning cam. This prevents the position where the outer diameter of the flying minute positioning cam suddenly decreases from colliding with the receiving part and causing damage to the parts.
[0025] 3. The eccentric limit column enables the flying hour return gear to achieve a more stable limiting effect by cooperating with the eccentric limit column during the process of returning from the extreme position to the initial position, ensuring that the hour hand drive gear can accurately drive the hour hand back to the state of pointing to the twelve o'clock direction of the dial. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic planar structural diagram of the coaxial time-division flyback structure provided in an embodiment of the present application.
[0027] Figure 2 It is a schematic diagram of the back mirror structure of the coaxial time-division flyback structure provided in an embodiment of the present application.
[0028] Figure 3 It is a schematic diagram of the axial structure of the coaxial time-division flyback structure provided in an embodiment of the present application.
[0029] Explanation of the accompanying reference numerals: 1-hour hand driving gear; 2-minute hand driving gear; 3-flying-minute input gear; 4-flying-minute positioning cam; 5-flying-minute return gear; 501-receiving portion; 502-flying-minute dial portion; 503-dial hook; 6-flying-minute return elastic member; 7-driving wheel; 8-fisheye column; 9-check wheel; 10-transmission wheel; 11-flying-hour input gear; 12-flying-hour positioning elastic member; 1201-positive contact surface; 1202-negative contact surface; 1203-positioning ridge; 13-flying-hour transmission gear; 14-flying-hour positioning missing gear; 15-flying-hour return gear; 1501-flying-hour dial portion; 1502-limiting ridge; 16-flying-hour return limiting portion; 17-flying-hour return transmission gear; 18-flying-hour return elastic member; 19-center shaft; 20-jewel bearing; 21-frame plate. DETAILED DESCRIPTION
[0030] The following is combined with Figure 1-2It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present application.
[0031] In this application, unless otherwise indicated, directional terms such as "upper" and "lower" generally refer to the relative directions of gravity when the corresponding component is in use, and "inner" and "outer" refer to the relative directions of the component or structure itself. Furthermore, it should be noted that terms such as "forward" refer to the direction of rotation of the components when the timepiece is in normal operation.
[0032] The embodiment of the present application discloses a coaxial time-division flyback structure.
[0033] like Figure 1 and Figure 2 As shown, the coaxial hour and minute flyback structure includes a frame, an hour hand flyback assembly, a minute hand flyback assembly, an hour hand drive gear 1 and a minute hand drive gear 2. The hour hand drive gear 1 is used to be connected to the hour hand on the dial, and the minute hand drive gear 2 is used to be connected to the minute hand on the dial. The hour hand drive gear 1 and the minute hand drive gear 2 are coaxially arranged on the frame through a central axis so as to be able to rotate around their own axes. The minute hand flyback assembly is used to drive the minute hand to rotate around its own axis, and after rotating a first specific angle, it returns to the initial position while continuing to rotate around its own axis. The hour hand flyback assembly is used to drive the hour hand to rotate around its own axis by a second specific angle of 1 / 12 when the minute hand returns to the initial position, and after rotating the second specific angle, it returns to the initial position while continuing to rotate around its own axis.
[0034] The dial of a clock with a coaxial hour-minute flyback structure may not be a standard circle, so the first specific angle and the second specific angle can be determined according to the corresponding dial structure.
[0035] Specifically, such as Figure 1 and Figure 2As shown, the minute hand flyback assembly includes a fly-cent input gear 3, a fly-cent positioning cam 4, a fly-cent return gear 5, and a fly-cent return elastic member 6. The fly-cent input gear 3 is rotatably mounted on the frame plate and is used to receive power. The fly-cent positioning cam 4 is coaxially arranged with the fly-cent input gear 3 and rotates synchronously. The fly-cent return gear 5 is rotatably mounted on the frame plate and meshes with the minute hand drive gear 2. The fly-cent return gear 5 is provided with a receiving portion 501 for abutting the cam and a fly-cent actuating portion 502 for abutting the fly-cent return elastic member 6. One end of the fly-cent return elastic member 6 is fixedly connected to the frame plate, and the other end abuts the fly-cent actuating portion 502. The outer diameter of the fly-cent positioning cam 4 continuously increases and decreases sharply to a minimum in the forward rotation direction of the fly-cent positioning cam 4. The flying-cent return gear 5 has an initial position and an extreme position. The flying-cent positioning cam 4 is used to drive the flying-cent return gear 5 to gradually move from the initial position to the extreme position. During the process of the flying-cent return gear 5 gradually moving from the initial position to the extreme position, the minute hand driving gear 2 is driven to rotate forwardly about its own axis by a first specific angle, and loses engagement with the flying-cent return gear 5 at the extreme position. When the flying-cent return gear 5 is in the initial position, the flying-cent return elastic member 6 is in a natural state. During the process of the flying-cent return gear 5 gradually moving from the initial position to the extreme position, the flying-cent return elastic member 6 is gradually compressed. When the flying-cent return gear 5 loses engagement with the flying-cent return gear 5 at the extreme position, the flying-cent return gear 5 returns from the compressed state to the natural state, and is used to drive the flying-cent return gear 5 to immediately return from the extreme position to the initial position, and re-engage the flying-cent return gear 5 with the flying-cent positioning cam 4.
[0036] In the operating mechanism of the minute hand flyback assembly, the fly-cent input gear 3 is responsible for receiving and transmitting power to the fly-cent positioning cam 4. Subsequently, the fly-cent positioning cam 4 drives the fly-cent return gear 5 from its initial position to its limit position. Upon reaching the limit position, the fly-cent positioning cam 4 disengages from the fly-cent return gear 5. Specifically, the contact between the fly-cent positioning cam 4 and the receiving portion 501 is disengaged from the highest radius of the fly-cent positioning cam 4. During this phase, the fly-cent return elastic member 6 is compressed and stores energy. Once the engagement is released, the fly-cent return elastic member 6 immediately releases the stored energy, driving the fly-cent return gear 5 to rapidly return from its limit position to its initial position and re-establish engagement with the fly-cent positioning cam 4. Because the fly-cent positioning cam 4 is used to drive the minute hand drive gear 2 via the fly-cent return gear 5, its rotational speed is one revolution every sixty minutes. Therefore, the angle of rotation of the fly-cent positioning cam 4 during the process of returning the fly-cent return gear 5 from its limit position to its initial position can be ignored. It can be assumed that the fly-cent return gear 5 is engaged with the fly-cent positioning cam 4 at its lowest radius. This process ensures that the minute hand driving gear 2 can accurately drive the minute hand to complete the first specific angle of forward rotation and then return to the initial position immediately and stably, and this cycle can be carried out continuously and uninterruptedly.
[0037] like Figure 1 and Figure 2 As shown, in order to avoid the reverse rotation of the flying minute positioning cam 4, the minute hand flyback assembly also includes a driving wheel 7, a fisheye column 8, a check wheel 9 and a transmission wheel 10. The driving wheel 7 and the transmission wheel 10 are rotatable around their own axes and are arranged on the frame plate. The check wheel 9 is sleeved on the fisheye column 8, and the apex of the fisheye column 8 is arranged close to the driving wheel 7, so that the check wheel 9 remains engaged with the driving wheel 7. The transmission wheel 10 is arranged on the arc side of the fisheye column 8 and is engaged with the flying minute input gear 3.
[0038] The top of the fisheye column 8 is positioned near the driving wheel 7 to ensure that the check wheel 9 maintains a secure mesh with the driving wheel 7. When the driving wheel 7 rotates in the forward direction, its power acts on the check wheel 9, causing it to move toward the transmission wheel 10 on the fisheye column 8, thereby achieving a tight mesh with the transmission wheel 10. The power is then transmitted to the flywheel input gear 3 via the transmission wheel 10, ensuring smooth transmission and efficient utilization of power.
[0039] Conversely, if driving wheel 7 rotates in the reverse direction, its power causes check wheel 9 to move away from transmission wheel 10 on fisheye column 8, causing disengagement between check wheel 9 and transmission wheel 10. In this state, check wheel 9 can no longer transmit power to flying minute input gear 3 via transmission wheel 10, effectively preventing unnecessary reverse rotation of flying minute input gear 3 and ensuring the stability and reliability of the entire minute hand flyback assembly.
[0040] like Figure 1 and Figure 2As shown, the hour hand flyback assembly includes a flying time input gear 11, a flying time positioning elastic member 12, a flying time transmission gear 13, a flying time positioning missing gear 14, a flying time return gear 15, a flying time return limiter 16, a flying time return transmission gear 17 and a flying time return elastic member 18. The flying time input gear 11 and the flying time transmission gear 13 are both rotatable around their own axes and are arranged on the frame plate. The flying time input gear 11 is meshed with the flying time transmission gear 13. The flying time return gear 5 is provided with a toggle hook 503 for toggling the flying time input gear 11. One end of the flying time positioning elastic member 12 is fixedly connected to the frame plate, and the other end abuts against the flying time input gear 11 through a positioning step. The positioning step has The positive contact surface 1201 and the negative contact surface 1202, the side adjacent to the positive contact surface 1201 and the negative contact surface 1202 is a positioning edge 1203, when the flying input gear 11 rotates forward, the surface that abuts against the tooth surface of the flying input gear 11 is the positive contact surface 1201, when the flying input gear 11 rotates reversely, the surface that abuts against the tooth surface of the flying input gear 11 is the negative contact surface 1202, the stroke of the positive contact surface 1201 is less than the stroke of the negative contact surface 1202, the flying positioning missing gear 14 is coaxially arranged with the flying transmission gear 13 and rotates synchronously, the flying positioning missing gear 14 is engaged with the hour hand drive gear 1, and the flying return is The transmission gear 17 is coaxially arranged with the hour hand driving gear 1 and rotates synchronously. The flying return gear 15 is rotatably arranged on the frame plate around its own axis and meshes with the flying return transmission gear 17. The flying return gear 15 is provided with a flying toggle portion 1501 for abutting against the flying return elastic member 18. One end of the flying return elastic member 6 is fixedly connected to the frame plate, and the other end abuts against the flying toggle portion 1501. The flying return gear 15 has an initial position and an extreme position. The flying return limiting portion 16 is arranged on the frame plate. The flying return gear 15 is provided with a limiting edge 1502 for abutting against the flying return limiting portion 16. When the flying return gear 15 is in the initial position The limiting edge 1502 abuts against the flying return limiting portion 16, and the flying return transmission gear 17 is used to drive the flying return gear 15 to gradually move from the initial position to the limit position. When the flying return gear 15 is in the initial position, the flying return elastic member 6 is in a compressed state. In the process of the flying return gear 15 gradually moving from the initial position to the limit position, the flying return elastic member 18 is further compressed. When the flying return gear 15 is in the limit position, the flying positioning gear 14 loses engagement with the hour hand driving gear 1, and the flying return gear 15 returns to the natural state from the compressed state and is used to drive the flying return gear 15 to return to the initial position immediately from the limit position.
[0041] During the process of the flying-minute return gear 5 gradually moving from the initial position to the extreme position, the flying-hour toggle portion 1501 drives the flying-hour input gear 11 to rotate in the opposite direction. The stroke of the flying-hour input gear 11 is less than the stroke of the reverse contact surface 1202, so that the tooth top of the flying-hour input gear 11 cannot cross the positioning ridge 1203. During the process of the flying-minute return gear 5 returning from the extreme position to the initial position, the flying-hour toggle portion 1501 drives the flying-hour input gear 11 to rotate forward. The stroke of the flying-hour input gear 11 is greater than the stroke of the forward contact surface 1201, so that the tooth top of the flying-hour input gear 11 crosses the positioning ridge 1203. When the flying-hour input gear 11 rotates forward and crosses the positioning ridge 1203, it can drive the hour hand driving gear 1 to rotate around its own axis by 1 / 12 of the second specific angle.
[0042] The meshing design of the flying hour input gear 11 and the flying hour transmission gear 13, along with the toggle hook 503 on the flying hour return gear 5, ensures efficient power transmission. The flying hour positioning elastic member 12 interacts with the flying hour input gear 11 through the positioning step, allowing the flying hour input gear 11 to more easily cross the positioning ridge 1203 during forward rotation, thereby driving the hour hand drive gear 1 to rotate by a second specified angle of 1 / 12. Specifically, as the flying minute return gear 5 gradually moves from its initial position to its limit position, the flying hour toggle 1501 drives the flying hour input gear 11 in the reverse direction. The travel of the flying hour input gear 11 is less than the travel of the reverse contact surface 1202, preventing the tooth tops of the flying hour input gear 11 from crossing the positioning ridge 1203. As the flying minute return gear 5 returns from its limit position to its initial position, the flying hour toggle 1501 drives the flying hour input gear 11 in the forward direction. The travel of the flying hour input gear 11 is greater than the travel of the forward contact surface 1201, allowing the tooth tops of the flying hour input gear 11 to cross the positioning ridge 1203, thereby driving the hour hand drive gear 1 to rotate about its own axis by 1 / 12 of a second specified angle. Simultaneously, the meshing of the flying hour positioning gear 14 with the hour hand drive gear 1, and the synchronous rotation of the flying hour return transmission gear 17 with the hour hand drive gear 1, ensure accurate rotation of the hour hand each time the minute hand returns to its initial position. The cooperation between the flying time return gear 15 and the flying time return elastic member 18 causes it to be compressed during the movement from the initial position to the extreme position. After losing engagement with the flying time positioning gear 14 at the extreme position, the flying time return gear 15 quickly returns to its position, thereby achieving rapid resetting of the hour hand.
[0043] Since the angles between the hour hand drive gear 1 and the flying time return transmission gear 17 are different when the components are processed and pressed together, under the premise that the flying time return limiter 16 cannot be adjusted, when the flying time return gear 15 is in the initial position, the initial rotation angles of the flying time return transmission gear 17 in different coaxial hour and minute flyback structures are the same, while the rotation angles of the hour hand drive gear 1 are different, resulting in that when the flying time positioning missing gear 14 rotates, the hour hand drive gear 1 cannot engage with the flying time positioning missing gear 14 in time to respond to its movement and be driven by it.
[0044] like Figure 1 and Figure 2 As shown, to ensure that the hour hand drive gear 1 can accurately mesh with the flying hour positioning missing gear 14 in its initial position, the flying hour return limiter 16 includes an eccentric limiter post, which is rotatably mounted on the frame plate about its own eccentric axis. During the process of returning the flying hour return gear 15 from the extreme position to the initial position, since the flying hour return elastic member 6 is in a compressed state when the flying hour return gear 15 is in the initial position, the flying hour return gear 15 returns to the initial position by cooperating with the eccentric limiter post. Therefore, the position of the eccentric limiter post determines the initial position of the flying hour return gear 15. By adjusting the position of the eccentric limiter post, the initial position of the flying hour return gear 15 can be adjusted, thereby adjusting the initial rotation angle of the hour hand drive gear 1, ensuring that the hour hand drive gear 1 can accurately mesh with the flying hour positioning missing gear 14 in the initial position.
[0045] like Figure 3 As shown, since the flyback structure exerts a large force on the central axis when flyback occurs, the central axis is more likely to vibrate when flyback occurs. In order to constrain the central axis, jewel bearings are provided between the central axis and the multi-layer structure of the frame plate, thereby preventing vibration to the greatest extent.
[0046] The implementation principle of a coaxial time-division flyback structure in the embodiment of the present application is as follows:
[0047] When driving wheel 7 rotates forward, its power is transmitted to check wheel 9 via transmission wheel 10. Check wheel 9, on fisheye column 8, tends to approach transmission wheel 10, causing it to mesh with transmission wheel 10, allowing power to be smoothly transmitted to the splitter input gear 3. The splitter input gear 3 receives and transmits the power to the splitter positioning cam 4. Subsequently, the splitter positioning cam 4 drives the splitter return gear 5 from its initial position to its extreme position. The minute hand driving gear 2, driven by the splitter return gear 5, completes a first predetermined angle of rotation in the forward direction, driving the minute hand to complete the first predetermined angle of rotation in the forward direction.
[0048] When the flying minute positioning cam 4 reaches its limit position, the flying minute positioning cam 4 and the flying minute return gear 5 are released from their mating relationship. Specifically, the contact point between the flying minute positioning cam 4 and the receiving portion 501 is disengaged from the highest radius of the flying minute positioning cam 4. During this stage, the flying minute return elastic member 6 is compressed and stores energy. Once the mating relationship is released, the flying minute return elastic member 6 immediately releases the stored energy, driving the flying minute return gear 5 to quickly return from its limit position to its initial position and re-establish mating relationship with the flying minute positioning cam 4. At this point, the toggle hook 503 on the flying minute return gear 5 toggles the flying hour input gear 11, causing it to rotate forward across the positioning ridge 1203, driving the meshed flying hour transmission gear 13 to rotate. The flying hour positioning gear 14 rotates synchronously with the flying hour transmission gear 13, driving the hour hand drive gear 1 to rotate by 1 / 12 of the second specified angle, thereby driving the hour hand on the dial by 1 / 12 of the second specified angle. During this process, the flying hour return transmission gear 17 rotates synchronously with the hour hand drive gear 1, driving the flying hour return gear 15 from its initial position to its limit position. When the flying hour return gear 15 reaches its limit position, the toothed portion of the flying hour positioning gear 14 rotates close to the hour hand drive gear 1, causing the hour hand drive gear 1 to lose its meshing with the flying hour positioning gear 14. During this phase, the flying hour return elastic member 18 gradually compresses and stores energy. However, this compressed energy cannot, through the flying hour return transmission gear 17, the hour hand drive gear 1, the flying hour positioning gear 14, and the flying hour transmission gear 13, drive the flying hour input gear 11 to overcome the flying hour positioning elastic member 12 and reverse the flying hour input gear 11. Once the hour hand drive gear 1 loses its meshing with the flying hour positioning gear 14, the flying hour return elastic member 18 immediately releases its stored energy, driving the flying hour return gear 15 to quickly return from its limit position to its initial position.
[0049] On the contrary, if the driving wheel 7 rotates in the reverse direction, the check wheel 9 tends to move away from the transmission wheel 10 , causing the check wheel 9 to be disengaged from the transmission wheel 10 , thereby preventing the flywheel input gear 3 from rotating in the reverse direction.
[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A coaxial time-division flyback structure, characterized in that: include: A frame plate, an hour hand flyback assembly, a minute hand flyback assembly, an hour hand driving gear (1) and a minute hand driving gear (2), wherein the hour hand driving gear (1) is used to be connected to the hour hand on the dial, and the minute hand driving gear (2) is used to be connected to the minute hand on the dial, and the hour hand driving gear (1) and the minute hand driving gear (2) are coaxially arranged on the frame plate so as to be rotatable around their own axes, and the minute hand flyback assembly is used to drive the minute hand to rotate around its own axis, and after rotating a first specific angle, return to the initial position while continuing to rotate around its own axis, and the hour hand flyback assembly is used to drive the hour hand to rotate around its own axis by a second specific angle of 1 / 12 when the minute hand returns to the initial position, and after rotating the second specific angle, return to the initial position while continuing to rotate around its own axis.
2. The coaxial time-division flyback structure according to claim 1, characterized in that: The minute hand flyback assembly comprises a minute hand input gear (3), a minute hand positioning cam (4), a minute hand return gear (5) and a minute hand return elastic member (6). The flywheel input gear (3) is rotatably mounted on the frame plate around its own axis and is used to receive power. The flying part positioning cam (4) and the flying part input gear (3) are coaxially arranged and rotate synchronously. The minute return gear (5) is rotatably arranged on the frame plate around its own axis and meshes with the minute hand driving gear (2). The minute return gear (5) is provided with a receiving portion (501) for contacting the cam and a minute dialing portion (502) for contacting the minute return elastic member (6). One end of the fly-off return elastic member (6) is fixedly connected to the frame plate, and the other end is in contact with the fly-off dialing portion (502). The fly-cent return gear (5) has an initial position and an extreme position, and the fly-cent positioning cam (4) is used to drive the fly-cent return gear (5) to gradually move from the initial position to the extreme position, and loses engagement with the fly-cent return gear (5) at the extreme position. When the fly-cent return gear (5) is at the initial position, the fly-cent return elastic member (6) is in a natural state. In the process of the fly-cent return gear (5) gradually moving from the initial position to the limit position, the fly-cent return elastic member (6) is gradually compressed. When the fly-cent return gear (5) loses the matching with the fly-cent return gear (5) at the limit position, the fly-cent return gear (5) returns from the compressed state to the natural state, and is used to drive the fly-cent return gear (5) to immediately return from the limit position to the initial position, and re-match the fly-cent return gear (5) with the fly-cent positioning cam (4).
3. The coaxial time-division flyback structure according to claim 2, characterized in that: The outer diameter of the flying-centre positioning cam (4) continuously increases around the forward rotation direction of the flying-centre positioning cam (4) and suddenly decreases to a minimum.
4. The coaxial time-division flyback structure according to claim 2, characterized in that: The flying minute return gear (5) drives the minute hand driving gear (2) to rotate in a positive direction around its own axis by a first specific angle during the process of gradually moving from the initial position to the limit position.
5. The coaxial time-division flyback structure according to claim 2, characterized in that: The minute hand flyback assembly further comprises a driving wheel (7), a fisheye column (8), a check wheel (9) and a transmission wheel (10). The driving wheel (7) and the transmission wheel (10) are rotatably arranged on the frame plate around their own axes. The check wheel (9) is sleeved on the fisheye column (8). The vertex of the fisheye column (8) is arranged close to the driving wheel (7), so that the check wheel (9) remains engaged with the driving wheel (7). The transmission wheel (10) is arranged on the arc side of the fisheye column (8) and is engaged with the flying minute input gear (3).
6. The coaxial time-division flyback structure according to claim 2, characterized in that: The hour hand flyback assembly comprises a flytime input gear (11), a flytime positioning elastic member (12), a flytime transmission gear (13), a flytime positioning missing gear (14), a flytime return gear (15), a flytime return limiter (16), a flytime return transmission gear (17) and a flytime return elastic member (18). The flying time input gear (11) and the flying time transmission gear (13) are both rotatably arranged on the frame plate around their own axes. The flying time input gear (11) is meshed with the flying time transmission gear (13). The flying time return gear (5) is provided with a toggle hook (503) for toggling the flying time input gear (11). One end of the flying time positioning elastic member (12) is fixedly connected to the frame plate, and the other end abuts against the flying time input gear (11) through a positioning step. The positioning step has a positive contact surface (1201) and a negative contact surface (1202). One side adjacent to the positive contact surface (1201) and the negative contact surface (1202) is a positioning edge (1203). When the flying time input gear (11) rotates forward, the surface abutting against the tooth surface of the flying time input gear (11) is the positive contact surface (1201). When the flying time input gear (11) rotates backward, the surface abutting against the tooth surface of the flying time input gear (11) is the negative contact surface (1202). The stroke of the positive contact surface (1201) is smaller than the stroke of the negative contact surface (1202). The flying time positioning gear (14) and the flying time transmission gear (13) are coaxially arranged and rotate synchronously. The flying time positioning gear (14) is meshed with the hour hand driving gear (1). The flying hour return transmission gear (17) is coaxially arranged with the hour hand driving gear (1) and rotates synchronously. The flying return gear (15) is rotatably arranged on the frame plate around its own axis and meshes with the flying return transmission gear (17). The flying return gear (15) is provided with a flying toggle portion (1501) for contacting the flying return elastic member (18). One end of the flying-minute return elastic member (6) is fixedly connected to the frame plate, and the other end is in contact with the flying-hour toggle portion (1501). The flying return gear (15) has an initial position and an extreme position. The flying return limiting portion (16) is provided on the frame plate. The flying return gear (15) is provided with a limiting edge (1502) for abutting against the flying return limiting portion (16). When the flying return gear (15) is located at the initial position, the limiting edge (1502) abuts against the flying return limiting portion (16). The on-the-fly return transmission gear (17) is used to drive the on-the-fly return gear (15) to gradually move from the initial position to the limit position. When the flying hour return gear (15) is at the initial position, the flying hour return elastic member (6) is in a compressed state. During the process in which the flying hour return gear (15) gradually moves from the initial position to the limit position, the flying hour return elastic member (18) is further compressed. When the flying hour return gear (15) is at the limit position, the flying hour positioning missing gear (14) loses engagement with the hour hand driving gear (1). The flying hour return gear (15) returns to a natural state from the compressed state and is used to drive the flying hour return gear (15) to immediately return from the limit position to the initial position.
7. The coaxial time-division flyback structure according to claim 6, characterized in that: When the flying return gear (5) gradually moves from the initial position to the limit position, the flying time toggle portion (1501) drives the flying time input gear (11) to rotate in the opposite direction. The stroke of the flying time input gear (11) is smaller than the stroke of the reverse contact surface (1202), so that the tooth top of the flying time input gear (11) cannot cross the positioning edge (1203). During the process of the flying return gear (5) returning from the extreme position to the initial position, the flying time toggle portion (1501) drives the flying time input gear (11) to rotate in the positive direction, and the stroke of the flying time input gear (11) is greater than the stroke of the positive contact surface (1201), so that the tooth top of the flying time input gear (11) crosses the positioning ridge (1203). When the flying hour input gear (11) rotates in the forward direction and crosses the positioning ridge (1203), it can drive the hour hand driving gear (1) to rotate around its own axis by 1 / 12 of a second specific angle.
8. The coaxial time-division flyback structure according to claim 6, characterized in that: The flight return limiting portion (16) comprises an eccentric limiting column, and the eccentric limiting column is rotatably arranged on the frame plate around its own eccentric axis.