A device for trimming the balance spring of a watch

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By designing an instrument hairspring trimming device that uses a turntable to drive a slide bar and an opening/closing block, the problem of hairspring warping during cutting was solved, improving cutting stability and yield, and reducing the labor intensity of operators.

CN224487520UActive Publication Date: 2026-07-14KUNSHAN YONGHONGDA PRECISION INSTR CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: KUNSHAN YONGHONGDA PRECISION INSTR CO LTD
Filing Date: 2025-07-04
Publication Date: 2026-07-14

AI Technical Summary

Technical Problem

Existing hairspring trimming equipment suffers from low yield due to the elasticity of the hairspring during cutting. Operators need to manually hold the hairspring down, which causes hand shaking during prolonged operation and affects cutting stability.

Method used

Design an instrument hairspring trimming device. The hairspring is opened by a turntable driving a slide rod and an opening and closing block. It is then cut stably with a ring-shaped cutting blade. The hairspring is fixed by a slide groove and slide rail structure to prevent it from warping.

Benefits of technology

It improves the stability and yield of the hairspring cutting edge, reduces the labor intensity of operators, and enhances the accuracy and efficiency of cutting.

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Abstract

The utility model relates to the technical field of instrument hairspring, especially to an instrument hairspring trimming device, its technical scheme includes the placement cabin, the inside fixedly connected with the center pole in the placement cabin, the inboard of placement cabin is close to the position of top and is provided with the locating disc, the inside of slide groove is slidably connected with the slide rod in the locating disc, the one end of slide rod is fixedly connected with the opening and closing block, the opening and closing block is slidably connected in the bottom of locating disc, the opening and closing block is '' L '' shape setting. The utility model adopts the rotation of carousel to drive the slide rod to slide along the slide groove of locating disc and the slide rail of carousel, thereby letting the slide rod drive the opening and closing block to spread the hairspring, thereby fixing the hairspring in the inside of placement cabin, so that the problem that the hairspring is caused to rise because of the elasticity of itself when the annular cutting knife is trimming the edge of hairspring is avoided, and the stability when trimming the edge of hairspring is improved.

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Description

Technical Field

[0001] This utility model relates to the field of instrument hairspring technology, and in particular to an instrument hairspring trimming device. Background Technology

[0002] A clock spring is an elastic element used in various instruments. It generates a reaction torque to eliminate friction and free travel in the transmission system, ensuring the accuracy of the instrument. Most clock springs are spiral in shape, and the edges of the end of the clock spring need to be cut and trimmed during production.

[0003] Existing hairspring trimming equipment uses a mounting slot on the operating table, a positioning chamber inside the mounting slot, and the hairspring is placed inside the positioning chamber. The cutting blade is driven by an electrically controlled hydraulic structure to trim the hairspring inside the positioning chamber.

[0004] However, when the hairspring is placed in the cutting chamber for cutting, the hairspring itself is elastic. When the cutter head comes into contact with the hairspring, the hairspring will be squeezed and lifted up by the cutter head. Therefore, the operator needs to use tweezers to hold the hairspring down. During long-term operation, the operator's hand will shake slightly, resulting in a low yield of hairspring cutting. Therefore, this application proposes an instrument hairspring edge cutting device. Utility Model Content

[0005] The purpose of this invention is to address the problem in the prior art where the hairspring is squeezed by the cutter head and then lifted up, requiring the operator to use tweezers to hold the hairspring down. This results in slight hand tremors during prolonged operation, leading to a low yield of hairspring cutting. The invention proposes an instrument hairspring edge cutting device.

[0006] The technical solution of this utility model is as follows: an instrument hairspring trimming device, including a placement chamber, a central rod fixedly connected inside the placement chamber, a positioning plate arranged near the top of the placement chamber, a sliding groove opened inside the positioning plate, a sliding rod slidably connected inside the sliding groove, an opening and closing block fixedly connected to one end of the sliding rod, the opening and closing block slidably connected to the bottom of the positioning plate, and the opening and closing block is arranged in an "L" shape.

[0007] Optionally, a fitting block is fixedly connected to the outside of the positioning disk, the fitting block is fitted into the top of the placement chamber, and a turntable is rotatably connected to the top of the positioning disk, with a control component inside the turntable.

[0008] Optionally, the control component includes a slide rail, which is arc-shaped and opened inside the turntable. The slide rod is slidably connected inside the slide rail, and a handle is fixedly connected to the top of the turntable. There are two handles arranged symmetrically.

[0009] Optionally, one side of the placement chamber is notched, an annular cutting blade is provided above the placement chamber, a pressure plate is fixedly connected to the top of the annular cutting blade, and a pushing component is provided on the top of the pressure plate.

[0010] Optionally, the pushing assembly includes a telescopic cylinder, the output end of which is fixedly connected to the top of the lower pressure plate, and a support frame is fixedly connected to the side of the telescopic cylinder away from the lower pressure plate.

[0011] Optionally, the support frame is arranged in an inverted "L" shape, and a base is fixedly connected to one side of the support frame, the base being fixedly connected to the bottom of the placement compartment.

[0012] Optionally, a toggle plate is fixedly connected inside the turntable. The toggle plate is arc-shaped, and a positioning block abuts against one side of the toggle plate. The positioning block is trapezoidal, with rounded edges, and a pushing component is provided on one side of the positioning block.

[0013] Optionally, the pushing component includes a spring, one end of which is fixedly connected to one side of the positioning block, and the other end of the spring away from the positioning block is fixedly connected to a positioning plate. The positioning plate is fixedly connected to the top of the positioning disk, and a limit rod is fixedly connected to the side of the positioning block near the spring. The limit rod is slidably connected to the inside of the positioning plate at a position away from the positioning block.

[0014] Compared with the prior art, this application includes at least one of the following beneficial technical effects: the rotation of the turntable drives the slide rod to slide along the slide groove opened on the positioning plate and the slide rail opened on the turntable, so that the slide rod drives the opening and closing block to open the hairspring, thereby fixing the hairspring inside the placement chamber. This avoids the problem of the hairspring lifting up due to its own elasticity when the annular cutter cuts the edge of the hairspring, and improves the stability of the hairspring when cutting the edge. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an instrument hairspring trimming device;

[0016] Figure 2 A schematic cross-sectional view of an instrument hairspring trimming device;

[0017] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0018] Figure 4 A schematic diagram of a positioning disk structure for an instrument hairspring trimming device;

[0019] Figure 5 This is a schematic diagram of a turntable structure for an instrument hairspring trimming device;

[0020] Figure 6 for Figure 5 Enlarged structural diagram at point B.

[0021] Reference numerals: 1. Placement compartment; 2. Center rod; 3. Opening / closing block; 4. Slide groove; 5. Slide rod; 6. Turntable; 7. Slide rail; 8. Handle; 9. Fitting block; 10. Actuating plate; 11. Positioning block; 12. Spring; 13. Positioning plate; 14. Limiting rod; 15. Base platform; 16. Support frame; 17. Telescopic cylinder; 18. Lower pressure plate; 19. Circular cutting blade; 20. Positioning disc. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figures 2-4 As shown, the present invention proposes an instrument hairspring trimming device, including a placement chamber 1, a central rod 2 fixedly connected inside the placement chamber 1, the center position of the hairspring can be determined by the central rod 2, a positioning plate 20 is provided on the inner side of the placement chamber 1 near the top, a sliding groove 4 is opened inside the positioning plate 20, a sliding rod 5 is slidably connected inside the sliding groove 4, an opening and closing block 3 is fixedly connected to one end of the sliding rod 5, the movement of the opening and closing block 3 can be controlled by the sliding of the sliding rod 5 inside the sliding groove 4, the opening and closing block 3 is slidably connected to the bottom of the positioning plate 20, the opening and closing block 3 is arranged in an "L" shape, and the opening and closing block 3 can be opened from the center position of the hairspring.

[0025] in addition Figure 1 and Figure 5 As shown, a fitting block 9 is fixedly connected to the outside of the positioning disk 20. The fitting block 9 fits into the top of the placement chamber 1. The positioning disk 20 can be fixed inside the placement chamber 1 near the top by the fitting block 9. A turntable 6 is rotatably connected to the top of the positioning disk 20. A control component is set inside the turntable 6. The control component includes a slide rail 7. The slide rail 7 is arc-shaped and opened inside the turntable 6. When the turntable 6 rotates, the slide rod 5 can slide along the inside of the slide rail 7, thereby allowing the opening and closing block 3 to open the hairspring. The slide rod 5 is slidably connected inside the slide rail 7. A handle 8 is fixedly connected to the top of the turntable 6. The handle 8 is used to conveniently control the rotation of the turntable 6. There are two handles 8 arranged symmetrically.

[0026] also Figure 1 and Figure 2As shown, the placement chamber 1 has a notch on one side, which allows the protruding end of the hairspring to extend for cutting. An annular cutting blade 19 is positioned above the placement chamber 1, and a lower pressure plate 18 is fixedly connected to the top of the annular cutting blade 19. The lower pressure plate 18 controls the annular cutting blade 19 to stably cut the hairspring extending beyond the placement chamber 1. A pushing assembly is located on the top of the lower pressure plate 18, including a telescopic cylinder 17. The output end of the telescopic cylinder 17 is fixedly connected to the top of the lower pressure plate 18. The telescopic cylinder 17 can... The lower pressure plate 18 and the annular cutting blade 19 are moved to allow the annular cutting blade 19 to stably cut the hairspring. A support frame 16 is fixedly connected to the side of the telescopic cylinder 17 away from the lower pressure plate 18. The support frame 16 is set in an inverted "L" shape. The support frame 16 can support and fix the telescopic cylinder 17, the lower pressure plate 18 and the annular cutting blade 19. A base platform 15 is fixedly connected to one side of the support frame 16. The base platform 15 is fixedly connected to the bottom of the placement chamber 1. The base platform 15 can assist the support frame 16 in support and can also be used to support the placement chamber 1.

[0027] In this embodiment, when it is necessary to trim the end of the hairspring, the positioning disk 20 is removed from the inside of the placement chamber 1. At this time, the center of the hairspring can be aligned with the center rod 2 and placed into the inside of the placement chamber 1. The positioning disk 20 is then embedded into the inside of the placement chamber 1 by means of the fitting block 9. Then, the handle 8 is turned so that the handle 8 drives the turntable 6 to rotate on the top of the positioning disk 20, thereby allowing the slide rail 7 inside the turntable 6 to push the slide rod 5 to slide.

[0028] The slide bar 5 will slide in a straight line along the groove 4 opened in the positioning plate 20. In this way, the slide bar 5 will drive the opening and closing block 3 to open the hairspring along the center position, and the excess end of the hairspring will protrude from the notch of the placement chamber 1, so that the hairspring can be trimmed.

[0029] During the trimming process, the telescopic cylinder 17 pushes the lower pressure plate 18 and the annular cutting blade 19 on one side of the support frame 16 toward the placement chamber 1 at the top of the base platform 15. When the annular cutting blade 19 reaches the outside of the placement chamber 1, the protruding hairspring at the notch position of the placement chamber 1 can be cut off. The telescopic cylinder 17 then drives the lower pressure plate 18 and the annular cutting blade 19 to reset, so that the spring 12 can be removed from the top of the placement chamber 1, thereby removing the trimmed hairspring from the inside of the placement chamber 1.

[0030] It should be noted that the rotation of the turntable 6 drives the slide rod 5 to slide along the slide groove 4 opened in the positioning plate 20 and the slide rail 7 opened in the turntable 6, so that the slide rod 5 drives the opening and closing block 3 to open the hairspring, thereby fixing the hairspring inside the placement chamber 1. This avoids the problem of the hairspring lifting up due to its own elasticity when the annular cutter 19 cuts the edge of the hairspring, and improves the stability of the hairspring when cutting the edge.

[0031] Example 2

[0032] like Figure 5 and Figure 6 As shown, based on Embodiment 1, a toggle plate 10 is fixedly connected inside the turntable 6. The toggle plate 10 is arc-shaped, and its arc structure facilitates rotation. A positioning block 11 abuts against one side of the toggle plate 10. The positioning block 11 is trapezoidal, and its edges are rounded. The rounded trapezoidal structure of the positioning block 11 facilitates the displacement of the positioning block 11 when the toggle plate 10 rotates. A pushing component is provided on one side of the positioning block 11. The pushing component includes a spring 12. One end of the spring 12 is fixedly connected to one side of the positioning block 11, and the end of the spring 12 away from the positioning block 11 is fixedly connected to a positioning plate 13. The spring 12 pushes the positioning block 11 to reciprocate and extend on the side of the positioning plate 13. The positioning plate 13 is fixedly connected to the top of the positioning disk 20. A limit rod 14 is fixedly connected to the side of the positioning block 11 near the spring 12. The limit rod 14 is slidably connected to the inside of the positioning plate 13 at a position away from the positioning block 11. The limit rod 14 can slide inside the positioning plate 13, thereby restricting the movement of the positioning block 11.

[0033] In this embodiment, when the turntable 6 rotates, it will cause the actuating plate 10 to slide along one side of the positioning block 11. The positioning block 11 will compress the spring 12 to contract. The positioning block 11 slides inside the positioning plate 13 by relying on the limiting rod 14 to ensure that the extension and retraction of the limiting rod 14 will not deviate. After the turntable 6 is released, the elastic force of the hairspring acts on the outside of the opening and closing block 3, and the trapezoidal structure of the positioning block 11 ensures that the actuating plate 10 will not reverse, thereby preventing the hairspring from pulling the opening and closing block 3 to move.

[0034] It should also be noted that the device adopts a structural design of a toggle plate 10 and a positioning block 11, which can ensure that the toggle plate 10 slides smoothly when the turntable 6 rotates, while the positioning block 11 can restrict the position of the toggle plate 10, preventing the opening and closing block 3 from moving inward under the force of the hairspring, which would cause the turntable 6 to reverse, thus improving the positioning of the turntable 6 and the stability of the opening and closing block 3 when it is opened.

[0035] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An instrument hairspring trimming device, comprising a storage compartment (1), characterized in that: The placement compartment (1) is fixedly connected to a central rod (2). A positioning plate (20) is provided on the inner side of the placement compartment (1) near the top. A sliding groove (4) is provided inside the positioning plate (20). A sliding rod (5) is slidably connected inside the sliding groove (4). An opening and closing block (3) is fixedly connected to one end of the sliding rod (5). The opening and closing block (3) is slidably connected to the bottom of the positioning plate (20). The opening and closing block (3) is arranged in an "L" shape.

2. The instrument hairspring trimming device according to claim 1, characterized in that, The positioning disk (20) is fixedly connected to a fitting block (9) on the outside. The fitting block (9) is fitted into the top of the placement chamber (1). The top of the positioning disk (20) is rotatably connected to a turntable (6). The turntable (6) is equipped with a control component inside.

3. The instrument hairspring trimming device according to claim 2, characterized in that, The control component includes a slide rail (7), which is arc-shaped and located inside the turntable (6). The slide rod (5) is slidably connected inside the slide rail (7). A handle (8) is fixedly connected to the top of the turntable (6). There are two handles (8) arranged symmetrically.

4. The instrument hairspring trimming device according to claim 1, characterized in that, The placement chamber (1) has a notch on one side, and an annular cutting blade (19) is provided above the placement chamber (1). A pressure plate (18) is fixedly connected to the top of the annular cutting blade (19), and a pushing component is provided on the top of the pressure plate (18).

5. The instrument hairspring trimming device according to claim 4, characterized in that, The pushing assembly includes a telescopic cylinder (17), the output end of which is fixedly connected to the top of the lower pressure plate (18), and a support frame (16) is fixedly connected to the side of the telescopic cylinder (17) away from the lower pressure plate (18).

6. The instrument hairspring trimming device according to claim 5, characterized in that, The support frame (16) is arranged in an inverted "L" shape. A base (15) is fixedly connected to one side of the support frame (16), and the base (15) is fixedly connected to the bottom of the placement compartment (1).

7. The instrument hairspring trimming device according to claim 3, characterized in that, The turntable (6) is fixedly connected to a toggle plate (10). The toggle plate (10) is arc-shaped. A positioning block (11) is abutted on one side of the toggle plate (10). The positioning block (11) is trapezoidal. The edge of the positioning block (11) is rounded. A pushing component is provided on one side of the positioning block (11).

8. The instrument hairspring trimming device according to claim 7, characterized in that, The pushing component includes a spring (12), one end of which is fixedly connected to one side of the positioning block (11), and the other end of the spring (12) away from the positioning block (11) is fixedly connected to a positioning plate (13). The positioning plate (13) is fixedly connected to the top of the positioning disk (20). A limit rod (14) is fixedly connected to the side of the positioning block (11) near the spring (12). The limit rod (14) is slidably connected to the inside of the positioning plate (13) at a position away from the positioning block (11).