Coaxial time division flyback structure

Abstract

The invention relates to the technical field of clock mechanical transmission, in particular to a coaxial minute hand flyback structure which comprises a frame plate, an hour hand flyback assembly, a minute hand flyback assembly, an hour hand driving gear and a minute hand driving gear, the hour hand driving gear is used for being connected with an hour hand on a dial plate, and the minute hand driving gear is used for being connected with a minute hand on the dial plate. The hour hand driving gear and the minute hand driving gear are coaxially arranged on the frame plate in a manner of rotating around the own axis, and the minute hand flyback assembly is used for driving the minute hand to rotate around the own axis and continuously rotate around the own axis while returning to an initial position after rotating by a first specific angle; and the hour hand fly-back assembly is used for driving the hour hand to rotate around the own axis by 1 / 12 of a second specific angle when the minute hand returns to the initial position, and continuously rotate around the own axis while returning to the initial position after rotating by the second specific angle. The application has the effect of realizing the linkage of the hour hand and the minute hand.

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 time-minute flyback structure. Background Art

[0002] The traditional watchmaking industry has been developing continuously. In order to meet people's demand for diversified time display functions, various novel time display mechanisms have emerged. Among them, the hour and minute flyback mechanism has attracted much attention in the high-end watchmaking industry due to its unique design and precise time control capabilities. This structure can realize the periodic flyback action of the hour and minute hands, enhancing the visual appreciation and practicality.

[0003] Most of the hour and minute flyback mechanisms currently on the market rely mainly on basic mechanical principles to display time. Specifically, common traditional technical solutions usually control the hour hand and minute hand through two independent drive gears. Although these solutions can basically meet the time display requirements, they have certain limitations in actual application and cannot achieve the linkage between the hour hand and the minute hand. Summary of the invention

[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: A coaxial hour and minute flyback structure comprises a frame plate, an hour hand flyback assembly, a minute hand flyback assembly, an hour hand driving gear and a minute hand driving gear, wherein the hour hand driving gear is used to be connected to the hour hand on a dial, and the minute hand driving gear is used to be connected to the minute hand on the dial, the hour hand driving gear and the minute hand driving gear are coaxially arranged on the frame plate 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, it returns 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, it returns to the initial position while continuing to rotate around its own axis.

[0006] By adopting the above technical solution, the hour hand driving gear and the minute hand driving gear are coaxially arranged and respectively connected to the hour hand and the minute hand on the dial, so that every time the minute hand completes the rotation of the first specific angle and returns to the initial position, the hour hand can rotate 1 / 12 of the second specific angle accordingly. This design ensures the accuracy of the clock display and the coordination of the hour and minute hand movements. At the same time, every time the minute hand completes the rotation of the first specific angle and returns to the initial position, the hour hand completes the rotation of the second specific angle and returns to the initial position. The flyback structure ensures that each flyback can return to the initial position, eliminating the mechanical error accumulated by long-term continuous rotation.

[0007] 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, wherein the fly-cent input gear is rotatable about its own axis and is arranged on the frame plate 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 is rotatable about its own axis and is arranged on the frame plate and is meshed 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, and the fly-cent positioning cam is coaxially arranged with the fly-cent input gear and rotates synchronously, the fly-cent return gear is rotatable about its own axis and is meshed with the minute hand driving gear, The fly-cent positioning cam is used to drive the fly-cent return gear to gradually move from the initial position to the limit position, and lose the match with the fly-cent return gear at the limit position. When the fly-cent return gear is at the initial position, the fly-cent return elastic member is in a natural state. During the process of the fly-cent return gear gradually moving from the initial position to the limit position, the fly-cent return elastic member is gradually compressed. When the fly-cent return gear loses the match with the fly-cent return gear at the limit position, the fly-cent return gear returns to the natural state from the compressed state, and is used to drive the fly-cent return gear to immediately return from the limit position to the initial position, and re-match the fly-cent return gear with the fly-cent positioning cam.

[0008] By adopting the above technical solution, the flying-cent input gear in the minute hand flyback assembly receives power and transmits it to the flying-cent positioning cam, and the flying-cent positioning cam drives the flying-cent return gear to move from the initial position to the extreme position, and loses the match with the flying-cent return gear at the extreme position. At this time, the flying-cent return elastic member is in a compressed state, and when the match is lost, the flying-cent return gear immediately returns from the extreme position to the initial position under the action of the flying-cent return elastic member, and re-matches with the flying-cent positioning cam, thereby realizing that the minute hand driving gear drives the minute hand to accurately rotate in the positive direction by the first specific angle and then quickly returns to the initial position, and this process can be performed continuously.

[0009] Optionally, the outer diameter of the flying-centre positioning cam increases continuously around the forward rotation direction of the flying-centre positioning cam and decreases suddenly to a minimum.

[0010] 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 decreases suddenly, thereby ensuring that the minute hand quickly returns to the initial position after accurately completing the first specific angle rotation.

[0011] Optionally, the flying-minute return gear drives the minute hand driving gear to rotate positively around its own axis by a first specific angle during the process of gradually moving from the initial position to the extreme position.

[0012] 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.

[0013] Optionally, the minute hand flyback assembly also 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.

[0014] By adopting the above technical solution, the vertex of the fisheye column is set close to the driving wheel, ensuring that the non-return wheel always maintains a meshing state with the driving wheel. As the driving wheel rotates forward, the non-return wheel is affected by the driving wheel and has a tendency to approach the transmission wheel on the fisheye column, and meshes with the transmission wheel, and is transmitted to the flying splitter input gear through the transmission wheel, thereby realizing effective power transmission. As the driving wheel rotates reversely, the non-return wheel is affected by the driving wheel and has a tendency to move away from the transmission wheel on the fisheye column, and is disengaged from the transmission wheel. The non-return wheel cannot be transmitted to the flying splitter input gear through the transmission wheel, thereby avoiding the reverse rotation of the flying splitter input gear.

[0015] 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 contact surface and reverse contact surface, the side adjacent to the forward contact surface and the reverse contact surface is a positioning edge, the surface abutting against the tooth surface of the flying time input gear when the flying time input gear rotates forward is the forward contact surface, and the surface abutting against the tooth surface of the flying time input gear when the flying time input gear rotates reversely is the reverse contact surface, the stroke of the forward contact surface is smaller than the stroke of the reverse contact surface, the flying time positioning missing gear is coaxially arranged with the flying time transmission gear and rotates synchronously, the flying time positioning missing gear is meshed with the hour hand driving gear, and the flying time return transmission gear is coaxially arranged with the hour hand driving gear and rotates synchronously, The flying time return gear can be rotatably arranged on the frame plate around its own axis and meshes with the flying time return transmission gear. The flying time return gear is provided with a flying time toggle part for abutting against the flying time return elastic member. One end of the flying time return elastic member is fixedly connected to the frame plate, and the other end abuts against the flying time toggle part. The flying time return gear has an initial position and an extreme position. The flying time return limiting part is arranged on the frame plate. The flying time return gear is provided with a limiting edge for abutting against the flying time return limiting part. When the flying time return gear is in the initial position, the limiting edge abuts against the flying time return limiting part. 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 a compressed state and is used to drive the flying time return gear to immediately return from the extreme position to the initial position.

[0016] By adopting the above technical solution, the hour hand flyback assembly can realize the periodic flyback action of the hour hand. Specifically, the meshing design of the flying time input gear and the flying time transmission gear, and the toggle hook on the flying time return gear can ensure the effective transmission of power. The flying time positioning elastic member interacts with the flying time input gear through the positioning step, so that the flying time input gear is easier to cross the positioning edge when rotating in the forward direction, thereby driving the hour hand driving gear to rotate 1 / 12 of the second specific angle. At the same time, the meshing of the flying time positioning missing gear and the hour hand driving gear, and the synchronous rotation of the flying time return transmission gear and the hour hand driving gear ensure that the hour hand can rotate accurately every time the minute hand returns to the initial position. The cooperation of the flying time return gear and the flying time return elastic member causes it to be compressed during the movement from the initial position to the extreme position. After losing the meshing with the flying time positioning missing gear at the extreme position, the flying time return gear quickly returns to its position, realizing the rapid reset of the hour hand.

[0017] 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 forward, 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 forward 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.

[0018] By adopting the above technical solution, when the flying-point return gear gradually moves from the initial position to the extreme position, the flying-time toggle part drives the flying-time input gear to rotate in the opposite direction, and the stroke of the flying-time input gear is smaller than the stroke of the reverse contact surface, so that the tooth top of the flying-time input gear cannot cross the positioning edge; when the flying-point return gear returns from the extreme position to the initial position, the flying-time toggle part drives the flying-time input gear to rotate in the forward direction, and the stroke of the flying-time input gear is larger than the stroke of the forward contact surface, so that the tooth top of the flying-time input gear can cross the positioning edge, thereby driving the hour hand driving gear to rotate around its own axis by 1 / 12 of the second specific angle.

[0019] 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.

[0020] 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 the flying hour return gear can cooperate with the eccentric limit column in the process of returning from the extreme position to the initial position, thereby realizing the limiting effect more stably and ensuring that the hour hand driving gear accurately returns to the initial position.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The hour hand flyback assembly uses different stroke settings when the flying hour input gear rotates forward and reverse, so that the hour hand drive gear accurately rotates 1 / 12 of a second specific angle when the minute hand returns to its initial position, ensuring the precise linkage of the hour hand and minute hand; 2. The minute hand flyback assembly cooperates with the driving wheel, fisheye column, check wheel and transmission wheel to prevent 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, so that the position where the outer diameter of the flying minute positioning cam suddenly decreases will not collide with the receiving part, causing damage to the parts; 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 driving 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

[0022] Figure 1 It is a schematic diagram of the planar structure of the coaxial time-division flyback structure provided in an embodiment of the present application.

[0023] 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.

[0024] 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.

[0025] Explanation of the accompanying drawings: 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 part; 502-flying minute dialing part; 503-dial hook; 6-flying minute return elastic member; 7-driving wheel; 8-fisheye column; 9-check wheel; 10-transmission wheel; 11-flying time input gear; 12-flying time positioning elastic member; 1201-positive contact surface; 1202-reverse contact surface; 1203-positioning ridge; 13-flying time transmission gear; 14-flying time positioning missing gear; 15-flying time return gear; 1501-flying time dialing part; 1502-limiting ridge; 16-flying time return limiting part; 17-flying time return transmission gear; 18-flying time return elastic member; 19-central axis; 20-jewel bearing; 21-frame plate. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-2 The present application is further described in detail. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present application.

[0027] In this application, unless otherwise stated, the directional terms used, such as "upper" and "lower", generally refer to the "upper" and "lower" relative to the gravity direction when the corresponding parts are in use, and "inner" and "outer" refer to the inner and outer relative to the contour of the parts or structures themselves. In addition, it should be noted that the terms used, such as "forward", refer to the rotation direction of the parts when the watch is working normally.

[0028] The embodiment of the present application discloses a coaxial time-division flyback structure.

[0029] like Figure 1 and Figure 2 As shown, the coaxial hour and minute flyback structure includes 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. 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. The hour hand driving gear 1 and the minute hand driving gear 2 are coaxially arranged on the frame plate through a central axis and can rotate around their own axes. The minute hand flyback assembly is used to drive the minute hand to rotate around its own axis, and return to the initial position after rotating a first specific angle 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 return to the initial position after rotating the second specific angle while continuing to rotate around its own axis.

[0030] The dial of a watch with a coaxial hour-minute flyback structure may not be a standard circle, so the first specific angle and the second specific angle may be determined according to the corresponding dial structure.

[0031] Specifically, 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 rotatable around its own axis and is arranged 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 rotatable around its own axis and is meshed with the minute hand driving gear 2. The fly-cent return gear 5 is provided with a receiving portion 501 for abutting against the cam and a fly-cent dialing portion 502 for abutting against 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 against the fly-cent dialing portion 502. The outer diameter of the fly-cent positioning cam 4 increases continuously around the positive rotation direction of the fly-cent positioning cam 4 and decreases sharply to a minimum. 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 flying-cent drive gear 2 is driven to rotate positively around its own axis by a first specific angle, and loses the match 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 the match with the flying-cent return gear 5 at the extreme position, the flying-cent return gear 5 returns to the natural state from the compressed state, and is used to drive the flying-cent return gear 5 to return from the extreme position to the initial position immediately, and re-match the flying-cent return gear 5 with the flying-cent positioning cam 4.

[0032] In the operation mechanism of the minute hand flyback assembly, the flying minute input gear 3 is responsible for receiving and transmitting power to the flying minute positioning cam 4. Subsequently, the flying minute positioning cam 4 drives the flying minute return gear 5 to move from the initial position to the limit position, and releases the matching relationship with the flying minute return gear 5 when reaching the limit position, that is, the contact position between the flying minute positioning cam 4 and the receiving portion 501 is separated from the highest radius of the flying minute positioning cam 4. At this stage, the flying minute return elastic member 6 is compressed to store energy. Once the matching relationship is released, the flying minute return elastic member 6 immediately releases the stored energy, drives the flying minute return gear 5 to quickly return from the limit position to the initial position, and re-establishes matching with the flying minute positioning cam 4. Since the flying minute positioning cam 4 is used to drive the minute hand driving gear 2 through the flying minute return gear 5, the rotation speed of the flying minute positioning cam 4 is one circle in sixty minutes, so in the process of the flying minute return gear 5 returning from the limit position to the initial position, the angle of rotation of the flying minute positioning cam 4 can be ignored, and it is approximately considered that the flying minute return gear 5 and the flying minute positioning cam 4 are matched at the minimum radius. This process ensures that the minute hand driving gear 2 can accurately drive the minute hand to complete the positive rotation of the first specific angle and then return to the initial position immediately and stably, and this cycle can be carried out continuously and uninterruptedly.

[0033] 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 flying back 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.

[0034] The top of the fisheye column 8 is arranged close to the driving wheel 7 to ensure that the check wheel 9 can maintain a stable meshing state with the driving wheel 7. When the driving wheel 7 rotates forward, its power acts on the check wheel 9, causing it to show a tendency to approach the transmission wheel 10 on the fisheye column 8, and then achieve a tight meshing with the transmission wheel 10. Thereafter, the power is transmitted to the flying spindle input gear 3 through the transmission wheel 10, ensuring smooth transmission and effective use of power.

[0035] On the contrary, if the driving wheel 7 rotates in the reverse direction, its power will cause the check wheel 9 to show a tendency to move away from the transmission wheel 10 on the fisheye column 8, resulting in the disengagement between the check wheel 9 and the transmission wheel 10. In this state, the check wheel 9 can no longer transmit power to the flying minute input gear 3 through the transmission wheel 10, thereby effectively preventing the flying minute input gear 3 from rotating in the reverse direction and ensuring the stability and reliability of the entire minute hand flyback assembly.

[0036] 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 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 The positive contact surface 1201 and the reverse contact surface 1202, the side adjacent to the positive contact surface 1201 and the reverse contact surface 1202 is a positioning edge 1203, when the flying time input gear 11 rotates forward, the surface that abuts 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 reversely, the surface that abuts against the tooth surface of the flying time input gear 11 is the reverse contact surface 1202, the stroke of the positive contact surface 1201 is smaller than the stroke of the reverse contact surface 1202, the flying time positioning missing gear 14 is coaxially arranged with the flying time transmission gear 13 and rotates synchronously, the flying time positioning missing gear 14 is meshed with the hour hand driving gear 1, and the flying time returns to the original position The transmission gear 17 is coaxially arranged with the hour hand driving gear 1 and rotates synchronously. The flying time return gear 15 is rotatably arranged on the frame plate around its own axis and meshes with the flying time return transmission gear 17. The flying time return gear 15 is provided with a flying time toggle portion 1501 for abutting against the flying time return elastic member 18. One end of the flying time return elastic member 6 is fixedly connected to the frame plate, and the other end abuts against the flying time toggle portion 1501. The flying time return gear 15 has an initial position and an extreme position. The flying time return limiting portion 16 is arranged on the frame plate. The flying time return gear 15 is provided with a limiting edge 1502 for abutting against the flying time return limiting portion 16. When the flying time return gear 15 is in the initial position The limiting edge 1502 is in contact with 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 missing 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 from the limit position to the initial position immediately.

[0037] In the process of the flying-time return gear 5 gradually moving from the initial position to the extreme position, the flying-time toggle part 1501 drives the flying-time input gear 11 to rotate in the opposite direction, and 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 ridge 1203. In the process of the flying-time return gear 5 returning from the extreme position to the initial position, the flying-time toggle part 1501 drives the flying-time input gear 11 to rotate forward, and the stroke of the flying-time input gear 11 is larger than the stroke of the forward contact surface 1201, so that the tooth top of the flying-time input gear 11 crosses the positioning ridge 1203. When the flying-time 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.

[0038] The meshing design of the flying hour input gear 11 and the flying hour transmission gear 13, as well as the toggle hook 503 on the flying hour return gear 5, can ensure the effective transmission of power. The flying hour positioning elastic member 12 interacts with the flying hour input gear 11 through the positioning step, so that the flying hour input gear 11 is easier to cross the positioning edge 1203 when rotating in the forward direction, thereby driving the hour hand driving gear 1 to rotate 1 / 12 of the second specific angle. Specifically, when the flying minute return gear 5 gradually moves from the initial position to the limit position, the flying time toggle part 1501 drives the flying time input gear 11 to rotate in the opposite direction, and the stroke of the flying time input gear 11 is less 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; when the flying minute return gear 5 returns from the limit position to the initial position, the flying time toggle part 1501 drives the flying time input gear 11 to rotate in the forward direction, and the stroke of the flying time input gear 11 is greater than the stroke of the forward contact surface 1201, so that the tooth top of the flying time input gear 11 can cross the positioning edge 1203, thereby driving the hour hand driving gear 1 to rotate around its own axis by 1 / 12 of the second specific angle. At the same time, the meshing of the flying time positioning gear 14 and the hour hand driving gear 1, and the synchronous rotation of the flying time return transmission gear 17 and the hour hand driving gear 1 ensure that the hour hand can rotate accurately every time the minute hand returns to the 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 missing gear 14 at the extreme position, the flying time return gear 15 quickly returns to its original position, thereby realizing the rapid reset of the hour hand.

[0039] Since the angles between the hour hand driving 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 driving gear 1 are different, resulting in that when the flying time positioning missing gear 14 rotates, the hour hand driving gear 1 cannot timely engage with the flying time positioning missing gear 14 to respond to its movement and be driven by it.

[0040] like Figure 1 and Figure 2 As shown, in order to ensure that the hour hand driving gear 1 can accurately mesh with the flying time positioning missing gear 14 at the initial position, the flying time return limiting part 16 includes an eccentric limiting column, and the eccentric limiting column can be rotatably arranged on the frame plate around its own eccentric axis. In the process of the flying time return gear 15 returning from the extreme position to the initial position, since the flying time return elastic member 6 is in a compressed state when the flying time return gear 15 is in the initial position, the flying time return gear 15 is returned to the initial position by cooperating with the eccentric limiting column, so the position of the eccentric limiting column determines the initial position of the flying time return gear 15, and the initial position of the flying time return gear 15 can be adjusted by adjusting the position of the eccentric limiting column, thereby adjusting the initial rotation angle of the hour hand driving gear 1, so as to ensure that the hour hand driving gear 1 can accurately mesh with the flying time positioning missing gear 14 at the initial position.

[0041] like Figure 3 As shown, since the flyback structure exerts a large force on the central axis when flyback occurs, the central axis is prone 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.

[0042] The implementation principle of a coaxial time-division flyback structure in the embodiment of the present application is: When the driving wheel 7 rotates forward, its power is transmitted to the check wheel 9 through the transmission wheel 10. The check wheel 9 shows a tendency to approach the transmission wheel 10 on the fisheye column 8, so that the check wheel 9 and the transmission wheel 10 are meshed, and the power can be smoothly transmitted to the flying minute input gear 3. The flying minute input gear 3 receives and transmits the power to the flying minute positioning cam 4. Subsequently, the flying minute positioning cam 4 drives the flying minute return gear 5 to move from the initial position to the extreme position, and the minute hand driving gear 2 completes the rotation of the first specific angle in the forward direction under the action of the flying minute return gear 5, and drives the minute hand to complete the rotation of the first specific angle in the forward direction.

[0043] When the flying minute positioning cam 4 reaches the limit position, the flying minute positioning cam 4 and the flying minute return gear 5 are released from the matching relationship, that is, the contact position between the flying minute positioning cam 4 and the receiving portion 501 is separated from the highest radius of the flying minute positioning cam 4. At this stage, the flying minute return elastic member 6 is compressed and stores energy. Once the matching relationship is released, the flying minute return elastic member 6 immediately releases the stored energy, drives the flying minute return gear 5 to quickly reset from the limit position to the initial position, and re-establishes matching with the flying minute positioning cam 4. At this time, the toggle hook 503 on the flying minute return gear 5 toggle the flying hour input gear 11, and the flying hour input gear 11 rotates forward to cross the positioning edge 1203, and drives the flying hour transmission gear 13 meshed therewith to rotate. The flying hour positioning missing gear 14 rotates synchronously with the flying hour transmission gear 13 and drives the hour hand drive gear 1 to rotate 1 / 12 of the second specific angle, thereby driving the hour hand to rotate 1 / 12 of the second specific angle on the dial. During this process, the flying time return transmission gear 17 and the hour hand driving gear 1 rotate synchronously, and drive the flying time return gear 15 to move from the initial position to the extreme position. When the flying time return gear 15 moves to the extreme position, the part of the flying time positioning missing gear 14 that lacks teeth rotates to a position close to the hour hand driving gear 1, causing the hour hand driving gear 1 to lose the meshing with the flying time positioning missing gear 14. At this stage, the flying time return elastic member 18 is gradually compressed to store energy, and the compressed stored energy cannot drive the flying time input gear 11 to overcome the flying time positioning elastic member 12 and reverse the flying time input gear 11 through the flying time return transmission gear 17, the hour hand driving gear 1, the flying time positioning missing gear 14 and the flying time transmission gear 13. Once the hour hand driving gear 1 loses the meshing with the flying time positioning missing gear 14, the flying time return elastic member 18 immediately releases the stored energy and drives the flying time return gear 15 to quickly reset from the extreme position to the initial position.

[0044] On the contrary, if the driving wheel 7 rotates in the reverse direction, the check wheel 9 shows a tendency to move away from the transmission wheel 10, causing the check wheel 9 to be disengaged from the transmission wheel 10, thereby avoiding unnecessary reverse rotation of the flywheel input gear 3.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope 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 able to rotate 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 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 1 / 12 of a second specific angle 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.

2. The coaxial time-division flyback structure according to claim 1, characterized in that: The minute hand flyback assembly comprises 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 flywheel input gear (3) is arranged on the frame plate so as to be rotatable around its own axis and is used to receive power. The flying part positioning cam (4) is coaxially arranged with the flying part input gear (3) and rotates synchronously. The flying 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 flying minute return gear (5) is provided with a receiving portion (501) for contacting with the cam and a flying minute dialing portion (502) for contacting with the flying 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 shifting portion (502). The flying cent return gear (5) has an initial position and an extreme position, and 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, and loses engagement with the flying 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 match 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 to 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) increases continuously around the positive rotation direction of the flying-centre positioning cam (4) and decreases suddenly 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 positively around its own axis by a first specific angle during the process of gradually moving from the initial position to the extreme 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 arranged on the frame plate so as to be rotatable 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 meshed with the driving wheel (7); the transmission wheel (10) is arranged on the arc side of the fisheye column (8) and meshes 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), and 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 is in contact with 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 in contact with 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 in contact with 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) is coaxially arranged with the flying time transmission gear (13) and rotates synchronously. The flying time positioning missing 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 time return gear (15) is rotatably arranged on the frame plate around its own axis and meshes with the flying time return transmission gear (17). The flying time return gear (15) is provided with a flying time toggle portion (1501) for contacting with the flying time return elastic member (18). One end of the flying-second return elastic member (6) is fixedly connected to the frame plate, and the other end is in contact with the flying-second toggle portion (1501). The flying return gear (15) has an initial position and an extreme position. The flying return limiter (16) is arranged on the frame plate. The flying return gear (15) is provided with a limit edge (1502) for abutting against the flying return limiter (16). When the flying return gear (15) is located at the initial position, the limit edge (1502) abuts against the flying return limiter (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 extreme 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. In the process of the flying hour return gear (15) gradually moving from the initial position to the extreme position, the flying hour return elastic member (18) is further compressed. When the flying hour return gear (15) is at the extreme 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 extreme 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 shifting part (1501) drives the flying input gear (11) to rotate in the opposite direction. The stroke of the flying input gear (11) is smaller than the stroke of the reverse contact surface (1202), so that the tooth top of the flying input gear (11) cannot cross the positioning edge (1203). When the flying return gear (5) returns from the extreme position to the initial position, the flying shifting portion (1501) drives the flying input gear (11) to rotate in the positive direction, and the stroke of the flying input gear (11) is greater than the stroke of the positive contact surface (1201), so that the tooth top of the flying input gear (11) crosses the positioning edge (1203). When the flying hour input gear (11) rotates in the positive direction and crosses the positioning edge (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 on-the-fly return limiter (16) comprises an eccentric limiter column, and the eccentric limiter column is rotatably arranged on the frame plate around its own eccentric axis.

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