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Temperature-compensated balance-spring mechanism, movement and timepiece

A technology of temperature compensation and hairspring, which is applied to clocks, mechanically driven clocks, and frequency adjustment mechanisms. It can solve the problems of fine-tuning or continuous adjustment, and the inability to perform temperature characteristics, so as to suppress the change of differential rate and temperature compensation. The effect of excellent performance and high-precision adjustment

Active Publication Date: 2022-07-26
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in the adjustment of temperature characteristics based on the balance screw, only the adjustment of the presence or absence of installation, the change of the installation position, and the adjustment of the weight of the installed balance screw can be performed, so the temperature characteristics cannot be adjusted. fine-tuning or continuous adjustment of

Method used

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  • Temperature-compensated balance-spring mechanism, movement and timepiece
  • Temperature-compensated balance-spring mechanism, movement and timepiece
  • Temperature-compensated balance-spring mechanism, movement and timepiece

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0065] [clock]

[0066] figure 1 It is an external view of the clock 1. In addition, in each of the drawings shown below, in order to facilitate the viewing of the drawings, illustration of a part of the timepiece components may be omitted, and each timepiece component may be simplified and illustrated.

[0067] like figure 1 As shown, the timepiece 1 of the present embodiment is configured by incorporating a movement 2, a dial 3, various hands 4 to 6, and the like into a timepiece case 7. As shown in FIG.

[0068] The timepiece case 7 includes a case body 11 , a case cover (not shown), and a cover glass 12 . At the 3 o'clock position on the side of the case body 11 ( figure 1 The right side) is provided with the handle 15. The crown 15 is a member for operating the movement 2 from the outside of the case body 11 . The crown 15 is fixed to the stem 19 , and the stem 19 is inserted through the case body 11 .

[0069] [Movement]

[0070] figure 2 It is the top view whi...

no. 2 Embodiment approach

[0140] Next, a second embodiment of the present invention will be described. Figure 12 It is a partial cross-sectional view of the balance with hairspring 54 of the second embodiment. Figure 13 is along Figure 12 The arrows in the XIII observation map. The present embodiment is different from the above-described first embodiment in that, in the adjustment portion 200, the shaft portion 201 and the weight portion 202 are formed integrally.

[0141] Figure 12 , 13 The illustrated adjusting portion 200 includes the engaging portion 100 and the pin member 210 .

[0142] The small diameter portion 111 of the engaging portion 100 is inserted into the mounting hole 85 .

[0143] The pin member 210 includes a shaft portion 201 and a weight portion 202 .

[0144] The shaft portion 201 passes through the mounting hole 85 and is pressed into the engaging portion 100 . Accordingly, the pin member 210 is configured to be rotatable about the second axis O2 together with the engag...

no. 3 Embodiment approach

[0151] Next, a third embodiment of the present invention will be described. Figure 14 It is a perspective view of the balance with hairspring 54 of the third embodiment. The present embodiment differs from the above-described embodiments in that the attachment position of the adjustment portion 301 can be changed.

[0152] exist Figure 14 In the illustrated balance with hairspring 54 , a plurality of mounting holes 310 are formed in each deformation portion 80 . In the present embodiment, the attachment holes 310 are formed at intervals in the first circumferential direction.

[0153] Figure 15 is along Figure 14 Sectional view of line XV-XV in .

[0154] like Figure 14 , Figure 15 As shown, the adjustment part 301 is detachably attached to the deformation part 80 through at least any one of the attachment holes 310 of the respective attachment holes 310 .

[0155] In the adjustment portion 301 , a male screw portion 311 is formed on the shaft portion 115 of the ...

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Abstract

The present invention provides a temperature-compensated balance-spring mechanism, a movement, and a timepiece, capable of suppressing changes in differential rates, enabling simple and high-precision adjustment of the moment of inertia, and excellent temperature compensation performance. The temperature-compensated balance with hairspring mechanism includes a balance wheel (62), which is provided on the balance shaft so as to be rotatable around a first axis by the power of the hairspring, and has a high-expansion portion (82) and a low-expansion portion with different thermal expansion coefficients (81). The balance wheel has: a deformation part (80), which can be deformed in the radial direction according to the temperature change due to the difference in the thermal expansion coefficient of the high expansion part and the low expansion part; and an adjustment part (64), which has a weighting part (102), The weighting portion has a center of gravity at a position eccentric with respect to the second axis (O2) along the radial direction, and the adjustment portion is attached to the deforming portion in such a manner that at least the weighting portion can be oriented in the direction along the second axis. Rotate around the second axis with movement restricted.

Description

technical field [0001] The present invention relates to a temperature-compensated balance spring mechanism, a movement and a timepiece. Background technique [0002] The balance-spring mechanism that functions as a governor of a mechanical timepiece includes: a balance shaft extending along the axis; a balance wheel fixed to the balance shaft; and a hairspring. The balance shaft and the balance wheel periodically rotate forward and reverse (vibrate) around the axis as the hairspring expands and contracts. [0003] In the above-mentioned balance with hairspring, it is important to set the vibration period within a predetermined predetermined value. If the vibration period deviates from the predetermined value, the difference rate (speed or slowness of the timepiece) of the mechanical timepiece changes. [0004] The vibration period T of the balance with hairspring is represented by the following formula (1). In formula (1), I represents the "moment of inertia" of the balan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04B17/22G04B17/06
CPCG04B17/222G04B18/006G04B17/063G04B17/066
Inventor 中岛正洋川内谷卓磨藤枝久
Owner SEIKO INSTR INC
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