Needle chasing assembly and timing mechanism

Abstract

The invention discloses a needle following assembly and a timing mechanism, the needle following assembly comprises a needle following wheel and a center wheel coaxially arranged with the needle following wheel, the needle following wheel and the center wheel can rotate relatively, the needle following assembly further comprises a needle following unit, a needle following cam and a reset piece, and the needle following unit is rotatably arranged on the needle following wheel; the needle following cam and the center wheel are coaxially arranged and can rotate synchronously, and the outer wall of the needle following cam abuts against the needle following unit all the time. One end of the reset piece is connected to the needle following wheel, and the other end is connected to the needle following unit and used for applying force tightly attached to the needle following cam to the needle following unit. According to the needle following assembly, the problems of poor flatness and unstable contact caused by embedding a return spring into an elastic sheet in a traditional structure are solved, the stability and the response precision of needle following action are improved, and disengagement caused by vibration or abrasion is avoided; and meanwhile, continuous and reliable following between the needle following lever and the cam is realized, and accurate segmentation time measurement is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of timepiece, in particular to a needle chasing assembly and a timepiece mechanism. BACKGROUND

[0002] Related prior art includes timepieces with needle chasing function. In this case, a needle chasing mechanism is usually used to intermittently stop the timepiece needle during time measurement, while the measurement process is still ongoing, and then make it jump forward to the total measurement time. For example, in order to allow the time elapsed at that moment (segmented time) to be easily read, while still continuing to record the total elapsed time.

[0003] For example, the Chinese invention patent with publication number CN 201562140U discloses a double-second needle chasing timing mechanism in a mechanical watch, wherein the needle chasing return-to-zero lever is fixed with the needle chasing wheel piece, and the needle chasing return-to-zero lever can freely rotate around its rotation center; the heart-shaped cam is fixed with the base movement and can freely rotate relative to the needle chasing wheel piece, but since the return spring is clamped in the elastic sheet, it is not easy to ensure its own flatness, and when it contacts with the lever, the stability is poor, which easily leads to disengagement of the needle chasing wheel piece.

[0004] Therefore, it is urgent to design a needle chasing assembly and a timepiece mechanism to solve the above-mentioned problems. SUMMARY

[0005] In order to solve the technical problem of the prior art needle chasing timing mechanism that the return spring is clamped in the elastic sheet, which makes it not easy to ensure its own flatness, and when it contacts with the lever, the stability is poor, which easily leads to disengagement of the needle chasing wheel piece, a needle chasing assembly and a timepiece mechanism are provided.

[0006] To achieve the above-mentioned purpose, the specific technical solutions of the needle chasing assembly and the timepiece mechanism of the present application are as follows: A needle chasing assembly, comprising a needle chasing wheel and a center wheel coaxially arranged with the needle chasing wheel, the needle chasing wheel and the center wheel being capable of relative rotation, and further comprising: A needle chasing unit, which is rotationally arranged on the needle chasing wheel; A needle chasing cam, which is coaxially arranged with the center wheel and capable of synchronous rotation with the center wheel, the outer wall of the needle chasing cam always abutting against the needle chasing unit, and the needle chasing cam is arranged in a heart-shaped structure; A reset member, one end of which is connected to the needle chasing wheel, and the other end of which is connected to the needle chasing unit, for applying a force to the needle chasing unit which is in close contact with the needle chasing cam.

[0007] Further, the reset member comprises a reset body and mounting portions arranged at both ends of the reset body, and the reset member is detachably connected with the needle chasing unit and the needle chasing wheel through the mounting portions.

[0008] Further, the needle chasing wheel and the needle chasing unit are both provided with mounting holes, the mounting part is detachably connected with the mounting holes, the mounting part and the reset body form an included angle structure, and the included angle structure is an acute angle structure or a right angle structure, the mounting part is inserted into the mounting hole, so that the reset part is detachably connected with the needle chasing unit and the needle chasing wheel.

[0009] Further, the mounting directions of the two mounting parts are opposite, after the mounting part is inserted into the mounting hole, the two mounting parts are centrally symmetric relative to the midpoint of the reset body.

[0010] Further, the needle chasing unit comprises: The needle chasing lever is rotationally arranged on the needle chasing wheel, and the needle chasing lever is provided with a mounting slot at an end away from the connection with the needle chasing wheel. The abutting part is arranged in the mounting slot, and the part of the abutting part extending out of the mounting slot abuts against the outer wall of the needle chasing cam.

[0011] Further, the needle chasing assembly further comprises: The first fixing unit is used for rotationally arranging the needle chasing unit on the needle chasing wheel. The second fixing unit is arranged on the needle chasing wheel, the second fixing unit is provided with a positioning guide slot, the positioning guide slot is in communication with the mounting hole on the needle chasing wheel, and the positioning guide slot is arranged as a straight slot.

[0012] Further, the mounting part is arranged as a hook structure, the needle chasing wheel and the needle chasing unit are both provided with mounting protrusions, the mounting protrusions are matched with each other to be hooked, so that the hook structure is hung and matched with the mounting protrusions.

[0013] Further, the mounting part comprises a first mounting part and a second mounting part, the needle chasing wheel is provided with a mounting hole, and the mounting hole is used for detachably connecting with the first mounting part; the needle chasing unit is provided with a protrusion, and the second mounting part can be pressed against the protrusion to apply a force to the needle chasing unit to tightly abut against the needle chasing cam.

[0014] Further, the end of the second mounting part is provided with an anti-falling hook, the anti-falling hook is bent towards the protrusion to avoid the mounting part from separating from the needle chasing unit. When the needle chasing unit is lifted up by the needle chasing cam and rotated to the maximum limit position, the anti-falling hook can be hung and matched with the protrusion.

[0015] A timing mechanism, the timing mechanism comprises a braking assembly and the above-mentioned needle chasing assembly, the needle chasing assembly further comprises a first pointer and a second pointer, and the first pointer and the second pointer are arranged on the center wheel and the needle chasing wheel respectively.

[0016] Further, the braking assembly comprises: The drive unit is provided with a brake seat at an output end, and is used for driving the brake seat to rotate, and the brake seat is provided with an opening and closing column; At least one brake arm is rotatably arranged on the brake seat, and the brake arm is provided with a clamping groove used for clamping the opening and closing column; When the opening and closing column is located in the clamping groove, the brake arm clamps the needle chasing wheel and hinders the rotation of the needle chasing wheel; when the opening and closing column is separated from the clamping groove, the brake arm is separated from the needle chasing wheel and releases the needle chasing wheel.

[0017] The needle chasing assembly has the following advantages: the needle chasing unit is arranged on the needle chasing wheel, and a constant pressure is provided by the independent reset member to make the needle chasing unit closely contact the needle chasing cam, so that the problem of poor flatness and unstable contact caused by the return spring embedded in the elastic sheet in the traditional structure is solved. The design improves the stability and response accuracy of the needle chasing action, avoids disengagement caused by vibration or wear, and realizes continuous and reliable following between the needle chasing lever and the cam, so that the segmented time measurement is accurate.

[0018] The timing mechanism has the following advantages: the timing mechanism integrates the high-performance needle chasing assembly and the brake assembly to form a complete high-precision timing system. The double-pointer design supports recording total time and segmented time at the same time, and meets complex timing requirements (such as race and multi-circle timing). The brake assembly accurately controls the start and stop of the needle chasing wheel, cooperates with the stable needle chasing unit structure, realizes millisecond-level response and high repeatability reading, and is significantly better than the timing mechanism in the prior art which is easy to disengage and slow to respond. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a sectional view of the timing mechanism of the application; Figure 2 It is a structure schematic view of the needle chasing assembly of the first embodiment of the application; Figure 3 It is a structure schematic view of the reset member of the first embodiment of the application; Figure 4 It is a structure schematic view of the needle chasing assembly of the second embodiment of the application; Figure 5 It is a structure schematic view of the existing needle chasing assembly; Figure 6 It is a structure schematic view of the needle chasing assembly of the third embodiment of the application; Figure 7 It is a structure schematic view of the timing mechanism in a brake state of the application; Figure 8 It is a structure schematic view of the timing mechanism in a non-brake state of the application.

[0020] Mark description in the figure: Needle chasing wheel; 2, center wheel; 3, needle chasing unit; 31, needle chasing lever; 32, abutting portion; 33, protrusion; 4, needle chasing cam; 5, reset member; 51, reset body; 52, mounting portion; 521, first mounting portion; 522, second mounting portion; 523, anti-disengagement hook; 61, mounting hole; 62, mounting protrusion 7, first fixing unit; 71, first mounting nail; 72, first mounting tube; 8, second fixing unit; 81, second mounting nail; 82, second mounting tube; 83, positioning guide groove; 9, brake assembly; 91, driving unit; 92, brake seat; 921, first limiting groove; 922, second limiting groove; 93, opening and closing column; 94, brake arm; 941, clamping groove; 95, positioning spring rod; 101, first driving wheel; 102, second driving wheel. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] Those skilled in the art can understand that, although some embodiments herein include certain features but not other features included in other embodiments, the combination of features of different embodiments means to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0023] The embodiments of the present application will be described below with reference to the drawings. Figure 1 to the drawings Figure 8 A needle chasing assembly and a timing mechanism are described.

[0024] Embodiment One: The present embodiment provides a timing mechanism, Figure 1 is a sectional view of the timing mechanism of the present embodiment; the timing mechanism comprises a needle chasing assembly, Figure 2 is a structural schematic view of the needle chasing assembly of the present embodiment; as Figure 1 and Figure 2As shown, the chasing needle assembly includes a first pointer and a second pointer, which are respectively arranged on the center wheel 2 and the chasing needle wheel 1 (both of which are not shown); the chasing needle assembly further includes the chasing needle wheel 1 and the center wheel 2 coaxially arranged with the chasing needle wheel 1, the chasing needle wheel 1 and the center wheel 2 can rotate relative to each other, and the chasing needle assembly further includes a chasing needle unit 3, a chasing needle cam 4, and a reset member 5, wherein the chasing needle unit 3 is rotationally arranged on the chasing needle wheel 1; the chasing needle cam 4 is coaxially arranged with the center wheel 2 and can synchronously rotate with the center wheel 2, an outer wall of the chasing needle cam 4 is always in abutment with the chasing needle unit 3, and the chasing needle cam 4 is arranged in a heart-shaped structure; one end of the reset member 5 is connected to the chasing needle wheel 1, and the other end is connected to the chasing needle unit 3, for applying a force to the chasing needle unit 3 to tightly abut the chasing needle cam 4.

[0025] It can be understood that the chasing needle assembly solves the problem of poor flatness and unstable contact caused by the return spring embedded in the elastic sheet in the traditional structure by installing the chasing needle unit 3 on the chasing needle wheel 1 and providing a constant pressure to the chasing needle unit 3 by the independent reset member 5 to make the chasing needle unit 3 tightly abut the chasing needle cam 4. The design improves the stability and response accuracy of the chasing needle action, avoids disengagement caused by vibration or wear, and at the same time realizes continuous and reliable following between the chasing needle lever 31 and the cam, ensuring accurate and error-free segmented time measurement.

[0026] Figure 3 The structure of the reset member of the present embodiment is shown in the schematic view; Further, as shown in Figure 2 and Figure 3 The reset member 5 includes a reset body 51 and mounting portions 52 arranged at both ends of the reset body 51, and the reset member 5 is detachably connected to the chasing needle unit 3 and the chasing needle wheel 1 through the mounting portions 52.

[0027] It can be understood that the reset member 5 is designed as an integrated structure, which improves assembly convenience and structural consistency. Compared with the traditional welding or adhesive spring fixing method, this structure is convenient for batch production and replacement and maintenance, and can ensure that the stress direction is consistent every time it is installed, reducing the performance fluctuations caused by assembly errors. In addition, the standardized structure is more conducive to the application of automatic assembly process, improving manufacturing efficiency and product consistency.

[0028] Further, as shown in Figure 3 The mounting portions 52 and the reset body 51 form an included angle structure, and the included angle structure is arranged as an acute angle structure or a right angle structure.

[0029] It can be understood that the mounting portions 52 and the reset body 51 are designed as an acute angle or a right angle, which can effectively adjust the direction and size of the pre-tightening force of the reset member 5, so that the elastic force generated thereby more accurately acts on the vicinity of the rotation axis of the chasing needle unit 3, reducing the lateral stress and preventing the chasing needle lever 31 from being skewed and stuck.

[0030] Need to explain, this angle design geometry optimization significantly improves the motion stability and durability, especially in high frequency start-stop operation can still maintain good reset performance, prolong the service life.

[0031] Further, as shown in Figure 2 The installation hole 61 is provided on the needle chasing wheel 1 and the needle chasing unit 3, and the installation part 52 can be inserted into the installation hole 61, so that the reset part 5 is detachably connected with the needle chasing unit 3 and the needle chasing wheel 1.

[0032] It can be understood that the detachable connection of the reset part 5 is realized by using the plug-in type installation hole 61, which greatly simplifies the maintenance and replacement process, and the disassembly can be completed without using glue, riveting or special tools in the actual work process, reducing the later maintenance cost. At the same time, this connection mode allows independent detection and calibration of the reset part 5, which helps to ensure the consistency and reliability of the whole machine operation, and has obvious advantages in mass production and repair scene.

[0033] Further, the installation directions of the two installation parts 52 are opposite, specifically, in this embodiment, one of the installation parts 52 extends into the installation hole 61 of the needle chasing wheel 1 from top to bottom, and the other extends into the installation hole 61 on the needle chasing unit 3 from bottom to top.

[0034] It can be understood that the design of inserting from top to bottom enhances the stability and anti-loosening ability of the connection of the reset part 5. The two installation parts 52 are inserted from different directions, forming an interlocking effect, effectively resisting the risk of loosening caused by vibration or impact. At the same time, the above structure also simplifies the production process, and is convenient for production, installation, debugging and maintenance.

[0035] It should be noted that in a small watch, this structure can maximize the connection strength in a limited space, avoid falling off due to one-way stress, and improve the overall operation safety and long-term stability.

[0036] Further, as shown in Figure 2 The needle chasing unit 3 includes a needle chasing lever 31 and an abutting part 32, wherein the needle chasing lever 31 is rotationally arranged on the needle chasing wheel 1, and the needle chasing lever 31 is provided with a mounting groove at the end away from the connection with the needle chasing wheel 1; the abutting part 32 is arranged in the mounting groove, and the part of the abutting part 32 extending out of the mounting groove abuts against the outer wall of the needle chasing cam 4.

[0037] It can be understood that the abutting part 32 is independently arranged in the mounting groove of the needle chasing lever 31, realizing the functional modular design, and the structure also facilitates local replacement (such as replacing only the worn abutting part 32), reducing the maintenance cost. At the same time, the mounting groove structure of the needle chasing lever 31 can prevent the abutting part 32 from slipping, ensure the constant position of the contact point, and improve the timing repeatability.

[0038] Preferably, in the present embodiment, the abutting portion 32, as a working surface directly contacting the cam, can be separately processed with high wear-resistant material, while the lever body can be formed with lightweight metal, taking into account both strength and sensitivity. In other embodiments, the abutting portion 32 and the needle chasing lever 31 can also be selected from other materials without specific limitation.

[0039] In some embodiments, the needle chasing lever 31 and the abutting portion 32 can be provided as an integrally formed structure, which aims to avoid the increase in design cost caused by the selection of different materials for different structures, compared with step-by-step processing or assembly, integrally forming reduces production links, improves batch production efficiency, and shortens product delivery time; on the other hand, since the above-mentioned needle chasing assembly is usually arranged in a small volume, high density installation component such as a timer or a watch, the compact design of integrally forming realizes the operation demand of miniaturization and high density.

[0040] Further, the needle chasing assembly further comprises a first fixing unit 7 and a second fixing unit 8.

[0041] Specifically, the first fixing unit 7 is used to rotate the needle chasing unit 3 and is arranged on the needle chasing wheel 1; the first fixing unit 7 comprises a first mounting nail 71 and a first mounting pipe 72, the first mounting pipe 72 is arranged in the mounting hole 61 on the needle chasing wheel 1, and the first mounting nail 71 is sequentially inserted into the needle chasing lever 31 and the first mounting pipe 72 to fix the needle chasing lever 31 and the first mounting pipe 72 in the mounting hole 61 on the needle chasing wheel 1, and the needle chasing lever 31 can rotate relative to the first mounting nail 71 and the first mounting pipe 72.

[0042] It can be understood that the needle chasing assembly combines the mounting nail and the mounting pipe to form a rotating shaft structure, which not only ensures the stable installation of the needle chasing lever 31, but also realizes flexible rotation with low friction. Specifically, the mounting pipe acts as a bushing to protect the base body of the needle chasing wheel 1 from being damaged by repeated disassembly and assembly, thereby prolonging the service life of the core component.

[0043] Alternatively, the above mounting pipe structure can be replaced by a guide sleeve structure of the prior art, wherein the guide sleeve structure is mature in technology and accurate in tolerance control, suitable for a micro-precision movement environment, and can ensure quick response and no hysteresis of the needle chasing action. Therefore, the staff can select a suitable structure for design and assembly according to actual needs, and the present embodiment is not limited in detail.

[0044] Further, as shown in Figure 2 The second fixing unit 8 is arranged on the needle chasing wheel 1, and the second fixing unit 8 comprises a positioning guide groove 83, which is in communication with the mounting hole 61 on the needle chasing wheel 1. After any mounting portion 52 is connected with the mounting hole 61 on the needle chasing wheel 1, the reset member 5 can be installed in the positioning guide groove 83 along the extension direction of the positioning guide groove 83.

[0045] It can be understood that the positioning guide groove 83 guides the installation of the reset member 5 along a predetermined path, avoiding misalignment or distortion, and improving assembly efficiency and consistency. Especially in a small space, manual operation is prone to deviation, and the guide structure can automatically correct the deviation to ensure that the reset member 5 is in the correct posture and exhibits the best elastic performance. At the same time, the guide groove provides lateral support for the reset member 5, suppresses vibration interference, and enhances working stability.

[0046] Specifically, as shown in Figure 2 The positioning guide groove 83 is provided as a straight groove, wherein the straight guide groove structure is simple, easy to process, suitable for mass production, and the straight trajectory of the straight groove is consistent with the natural deformation direction of the reset member 5, reducing installation resistance and stress concentration, and preventing the reset body 51 from being fatigued and broken due to excessive bending. In addition, the straight groove is convenient for layout coordination with other components, saves space, and is conducive to compact design of the overall structure.

[0047] The following describes the working principle of the needle chasing assembly of the present embodiment, and the initial state of the needle chasing assembly is set as a double-needle synchronous operation state: When the timing function is started, the center wheel 2 driven by the base movement rotates, the center wheel 2 drives the first and second hands to normally move, at the same time, the needle chasing cam 4 also rotates with the shaft, the needle chasing lever 31 is in an open state, so that the needle chasing wheel 1 is loosened, but under the action of the reset member 5, the needle chasing lever 31 is tightly attached to the root of the needle chasing cam 4, so that the needle chasing wheel 1 rotates freely, therefore, in this state, the first and second hands can completely synchronously operate; After starting the chasing second function, the needle chasing wheel 1 is locked and cannot rotate any more, so that the second hand connected with the needle chasing wheel 1 stops, but at this time, the center wheel 2 still rotates, so that the first hand connected with the center wheel 2 continues to operate, that is, in this state, the first hand continues to operate, and the second hand stays at the current time point, realizing segmented time recording; After the chasing second function is turned off, the needle chasing wheel 1 is released, the needle chasing lever 31 quickly resets the needle chasing wheel 1 under the restoring force of the reset member 5, so that the needle chasing wheel 1 is tightly attached to the root of the needle chasing cam 4 again, since the needle chasing cam 4 always rotates with the main shaft, once the contact is restored, the needle chasing wheel 1 immediately synchronizes with the main wheel system, therefore, in this state, the first and second hands recombine and coincide, preparing for the next segmented time measurement.

[0048] Embodiment two: Figure 4 The structure diagram of the needle chasing assembly of the present embodiment is shown, and the present embodiment is similar to embodiment one, the difference lies in that the mounting part 52 is provided as a hook structure, the mounting protrusion 62 is arranged on the needle chasing wheel 1 and the needle chasing unit 3, and the mounting protrusion 62 can be matched with the hook structure to be hooked and matched, so that the hook structure is matched with the mounting protrusion 62.

[0049] In the present embodiment, as shown in Figure 4 The hook structure is provided in a circular arc shape, and the mounting protrusion 62 is provided in a cylindrical structure. During assembly, the hook structure can be hung on the mounting protrusion 62, so that the mounting portion 52 is hung and matched with the mounting protrusion 62.

[0050] It can be understood that the hook is matched with the circular arc mounting hole 61 to form a reliable hanging connection, and has good self-locking performance, and is not easy to fall off even in a strong vibration environment. The circular arc structure conforms to the stress direction, disperses stress, and avoids stress concentration to cause fracture. This connection method does not require additional locking parts (such as nuts or snap rings), simplifies the structure, reduces the weight, and is particularly suitable for ultra-thin movement design.

[0051] Embodiment three: The prior art disclosed in Patent No. CN 201562140U discloses a double-second chasing timing mechanism in a mechanical watch, Figure 5 is a structural schematic view of the existing chasing assembly. Referring to Figure 5 The chasing zero-return spring rod is divided into a chasing zero-return lever spring and a chasing zero-return lever spring pressing sheet, which greatly reduces the machining difficulty. The chasing zero-return lever spring part is fixed on the chasing wheel with spokes, and the zero-return lever spring can be adjusted in a small amount according to the working condition of the movement during installation of the chasing mechanism. However, since the reset spring is clamped in the elastic sheet, it is not easy to ensure the flatness, and the stability is poor when contacting with the lever, which easily causes the chasing wheel to disengage. The chasing assemblies of embodiments one and two have a large change in the reset part. The force of the reset part on the chasing unit 3 changes from compression to tension. Therefore, in order to improve the applicability of the chasing assembly, the present embodiment continues to use the compression method to improve the prior art.

[0052] Figure 6 is a structural schematic view of the chasing assembly of the present embodiment. As shown in Figure 6 The present embodiment is similar to embodiment one, and the difference lies in that the mounting portion 52 includes a first mounting portion 521 and a second mounting portion 522, the chasing wheel 1 is provided with a mounting hole 61, and the mounting hole 61 is used for detachable connection (hanging in the present embodiment) with the first mounting portion 521; the chasing unit 3 is provided with a protrusion 33, and the second mounting portion 522 can be compressed on the protrusion 33 to apply a force to the chasing unit 3 to tightly contact the chasing cam 4.

[0053] It can be understood that the two mounting portions 52 are separately arranged to realize differential connection. The first mounting portion 521 is responsible for suspension positioning, and the second mounting portion 522 applies a compression force, which has clear division of labor and reasonable force. The second mounting portion 522 directly acts on the protrusion 33 part, so that the reset torque is closer to the rotation center, the lever swing is reduced, the action sensitivity is improved, the force transmission path is optimized, and the reset reliability and dynamic response speed of the chasing unit 3 are improved.

[0054] Further, the end of the second mounting portion 522 is provided with an anti-disengagement hook 523, which is bent towards the protrusion 33 to avoid disengagement of the mounting portion 52 from the needle chasing unit 3. In operation, when the needle chasing unit 3 is lifted by the needle chasing cam 4 and rotated to the maximum limit position, the anti-disengagement hook 523 can be engaged with the protrusion 33.

[0055] It can be understood that the anti-disengagement hook 523 is automatically locked when the needle chasing unit 3 reaches the limit position, preventing the return member 5 from disengaging or being damaged due to overstroke, thereby playing a safety limiting role. This mechanism effectively deals with sudden impact or operation errors, protecting the internal mechanism. At the same time, the hook structure does not affect free movement within the normal working range, combining flexibility and safety, and significantly improving the fault tolerance and durability of the device.

[0056] Embodiment Four: The timing mechanism of the present embodiment, Figure 7 is a structural schematic diagram of the timing mechanism of the present embodiment in a braking state; Figure 8 is a structural schematic diagram of the timing mechanism of the present embodiment in an unbraked state; as Figure 7 and Figure 8 shown, the timing mechanism includes a braking assembly 9 and the needle chasing assembly of any one of the above-mentioned embodiments one, two or three, and the needle chasing assembly further includes a first pointer and a second pointer, which are respectively arranged on the center wheel 2 and the needle chasing wheel 1, and the braking assembly 9 can be engaged with the needle chasing wheel 1 to hinder the rotation of the needle chasing wheel 1.

[0057] The timing mechanism integrates the high-performance needle chasing assembly and the braking assembly 9 to form a complete high-precision timing system. The double-pointer design supports simultaneous recording of total time and segmented time, meeting complex timing requirements (such as race running and multi-circle timing). The braking assembly 9 precisely controls the start and stop of the needle chasing wheel 1, and cooperates with the stable structure of the needle chasing unit 3 to realize millisecond-level response and high repeatability of readings, which is significantly superior to the timing mechanism in the prior art which is easy to disengage and slow to respond.

[0058] The timing assembly is introduced based on embodiment one, and further, Figure 7 and Figure 8 as shown, the braking assembly 9 includes a driving unit 91 and at least one braking arm 94, wherein the output end of the driving unit 91 is provided with a braking seat 92, and the driving unit 91 is used to drive the rotation of the braking seat 92, and the braking seat 92 is provided with an opening and closing column 93; the braking arm 94 is rotationally arranged on the braking seat 92, and the braking arm 94 is provided with a clamping groove 941 used for engaging with the opening and closing column 93; When the opening and closing column 93 is located in the clamping groove 941, the brake arm 94 is clamped with the chasing needle wheel 1 and hinders the rotation of the chasing needle wheel 1; when the opening and closing column 93 is separated from the clamping groove 941, the brake arm 94 is separated from the chasing needle wheel 1 and releases the chasing needle wheel 1.

[0059] It can be understood that the automatic opening and closing of the brake arm 94 is realized through the linkage mechanism of the opening and closing column 93 and the clamping groove 941, which is simple in structure but reliable in action. The driving unit 91 only needs to rotate slightly to trigger the entire braking process, which is low in energy consumption and fast in response.

[0060] It should be noted that the above design avoids the problems of easy slipping and fast wear of the traditional friction plate type brake, realizes rigid clamping, and is more firmly locked, which is suitable for occasions that need to pause the chasing needle for a long time and ensures that the data does not drift.

[0061] Further, the brake assembly 9 further comprises a positioning spring rod 95, which is used for clamping cooperation with the brake seat 92 to limit the rotation of the brake seat 92; the brake seat 92 is provided with a first limiting groove 921 and a second limiting groove 922 at intervals, when the brake arm 94 is clamped with the chasing needle wheel 1, the positioning spring rod 95 is clamped with the first limiting groove 921, when the brake arm 94 is separated from the chasing needle wheel 1, the positioning spring rod 95 is clamped with the second limiting groove 922.

[0062] It can be understood that the positioning spring rod 95 cooperates with the double limiting grooves to realize the double stable positioning of the brake state, prevent the brake seat 92 from rebounding or drifting, and ensure that the "start" and "stop" modes are stably maintained. This self-locking mechanism does not need to be continuously powered or maintained by external force, which conforms to the design concept of energy saving and passive stability of mechanical watches. At the same time, the clear gear feeling also improves the user operation experience.

[0063] The use principle of the timing mechanism of the embodiment will be described in detail below based on the first embodiment, and the initial state is set as a double-needle synchronous running state: When the timing function is started, the basic movement drives the first driving wheel 101, the second driving wheel 102 and the center wheel 2 to rotate in turn, thereby driving the first pointer and the second pointer to normally move, at the same time, the chasing needle cam 4 also rotates with the shaft, the chasing needle lever 31 is in an open state, thereby releasing the chasing needle wheel 1, but under the action of the reset member 5, the chasing needle lever 31 is tightly attached to the root of the chasing needle cam 4, so that the chasing needle wheel 1 rotates freely, therefore, in this state, the first pointer and the second pointer can completely synchronously run; After the driving unit 91 is started to turn on the chasing function, the driving unit 91 drives the brake seat 92 to rotate, and the opening and closing column 93 on the brake seat 92 enters the clamping groove 941, thereby continuing to support the brake arm 94, so that the brake arm 94 is tightly embraced by the double arms under the elastic action of the brake arm 94, and the chasing needle wheel 1 is tightly embraced, at this time, the chasing needle wheel 1 is locked by the brake arm 94 and cannot rotate. Since the chasing needle wheel 1 is locked by the brake arm 94, the second pointer connected with the chasing needle wheel 1 stops, but at this time, the center wheel 2 still rotates, so that the first pointer connected with the center wheel 2 continues to run, that is, in this state, the first pointer continues to run, and the second pointer is kept at the current time point, thereby realizing the segmented time recording. After the driving unit 91 is closed to turn off the chasing function, the driving unit 91 drives the brake seat 92 to reset, and the opening and closing column 93 on the brake seat 92 is separated from the clamping groove 941, thereby separating from the support of the brake arm 94, at this time, the chasing needle wheel 1 is no longer locked by the brake arm 94, but is released, and at the same time, the chasing needle lever 31 quickly resets the chasing needle wheel 1 under the restoring force of the reset member 5, so that the chasing needle wheel 1 is tightly attached to the root of the chasing cam 4, since the chasing cam 4 always rotates with the main shaft, once the contact is restored, the chasing needle wheel 1 is immediately synchronized with the main wheel system, therefore, in this state, the first pointer and the second pointer are recombined and coincide, and are ready for the next segmented time measurement.

[0064] In actual application, the timing mechanism of the embodiment can be used for race timing, taking two athletes as an example, the first pointer and the second pointer are respectively configured as a first second hand and a second second hand, and the timing mechanism specifically acts as follows: the athletes start, the timing function is started, at this time, the first second hand and the first second hand run synchronously, when the first athlete crosses the finish line, the driving unit 91 is started, at this time, the first second hand is paused, the first athlete's result is displayed, and the second second hand continues to run; when the second athlete crosses the finish line, the driving unit 91 is closed, the second second hand stops, at this time, the first second hand is released and “catches up” with the main needle, and the second athlete's result is displayed. It should be noted that the means for stopping the second second hand can refer to the structure of the stopwatch in the prior art, and the embodiment will not be described in detail. It can be seen that the advantage of the above structure is that multiple intermediate times can be recorded without stopping the main timing, which is suitable for high-precision occasions such as sports events and flight navigation.

[0065] Obviously, the above embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Based on the above description, those skilled in the art can make other different forms of changes or modifications. It is not necessary or possible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. A sorting-stitch assembly, comprising a sorting-stitch wheel (1) and a center wheel (2) coaxially disposed with the sorting-stitch wheel (1), wherein the sorting-stitch wheel (1) and the center wheel (2) are rotatable relative to each other, characterized in that, Also includes: The repeating needle unit (3) is rotatably mounted on the repeating needle wheel (1); The needle-flicking cam (4) is coaxially arranged with the center wheel (2) and can rotate synchronously with the center wheel (2). The outer wall of the needle-flicking cam (4) always abuts against the needle-flicking unit (3). The needle-flicking cam (4) is set as a heart-shaped structure. The reset component (5) is connected at one end to the needle wheel (1) and at the other end to the needle unit (3) for applying a force to the needle unit (3) that is close to the needle cam (4).

2. The needle-serializing assembly according to claim 1, characterized in that, The reset component (5) includes a reset body (51) and mounting portions (52) disposed at both ends of the reset body (51). The reset component (5) is detachably connected to the needle-following unit (3) and the needle-following wheel (1) through the mounting portions (52).

3. The needle-serializing assembly according to claim 2, characterized in that, Both the needle roller (1) and the needle unit (3) are provided with mounting holes (61). The mounting part (52) can be detachably connected to the mounting hole (61). The mounting part (52) and the reset body (51) form an angle structure, and the angle structure is set as an acute angle structure or a right angle structure. The mounting part (52) can be inserted into the mounting hole (61) so that the reset part (5) can be detachably connected to the needle unit (3) and the needle roller (1).

4. The needle-serializing assembly according to claim 3, characterized in that, The two mounting parts (52) are installed in opposite directions.

5. The needle-serializing assembly according to any one of claims 3 or 4, characterized in that, The repeating unit (3) includes: A needle-following lever (31) is rotatably mounted on a needle-following wheel (1). A mounting groove is provided at the end of the needle-following lever (31) away from the connection point with the needle-following wheel (1). The abutting part (32) is provided in the mounting groove, and the part of the abutting part (32) extending out of the mounting groove abuts against the outer wall of the needle cam (4).

6. The needle-serializing assembly according to claim 5, characterized in that, The repeater assembly also includes: The first fixing unit (7) is used to rotate the needle-following unit (3) onto the needle-following wheel (1); The second fixing unit (8) is set on the needle wheel (1). The second fixing unit (8) is provided with a positioning guide groove (83). The positioning guide groove (83) is connected to the mounting hole (61) on the needle wheel (1). The positioning guide groove (83) is set as a straight groove.

7. The needle-serializing assembly according to claim 2, characterized in that, The mounting part (52) is configured as a hook structure. Mounting protrusions (62) are provided on both the needle wheel (1) and the needle unit (3). The mounting protrusions (62) can hook and match with the hook structure so that the hook structure and the mounting protrusions (62) can be engaged and matched.

8. The needle-serializing assembly according to claim 2, characterized in that, The mounting part (52) includes a first mounting part (521) and a second mounting part (522). The needle roller (1) is provided with a mounting hole (61) for detachable connection with the first mounting part (521). The needle unit (3) is provided with a protrusion (33), and the second mounting part (522) can press against the protrusion (33) to apply a force to the needle unit (3) that is close to the needle cam (4).

9. The needle-serializing assembly according to claim 8, characterized in that, The end of the second mounting part (522) is provided with an anti-detachment claw (523), which bends toward the protrusion (33) to prevent the mounting part (52) from detaching from the needle-following unit (3). When the needle-following unit (3) is lifted by the needle-following cam (4) and rotated to its maximum limit position, the anti-detachment claw (523) can engage with the protrusion (33).

10. A timing mechanism, characterized in that, The timing mechanism includes a braking assembly (9) and a timing assembly as described in any one of claims 1-9. The timing assembly further includes a first pointer and a second pointer, which are respectively disposed on the center wheel (2) and the timing wheel (1).

11. The timing mechanism according to claim 10, characterized in that, Braking assembly (9) includes: The drive unit (91) has a brake seat (92) at its output end, and the drive unit (91) is used to drive the brake seat (92) to rotate. The brake seat (92) has an opening and closing column (93). At least one brake arm (94) is rotatably mounted on a brake seat (92), and the brake arm (94) is provided with a snap-fit ​​groove (941) for engaging with the opening and closing column (93). When the opening and closing pin (93) is located in the locking groove (941), the brake arm (94) engages with the needle wheel (1) and prevents the needle wheel (1) from rotating; when the opening and closing pin (93) disengages from the locking groove (941), the brake arm (94) disengages from the needle wheel (1) and releases the needle wheel (1).

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