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Temperature compensated balance springs, movements and timepieces

A technology of temperature compensation and hairspring, which is applied to clocks, mechanically driven clocks, and mechanisms for stabilizing frequency. It can solve the problems of large vibration period changes and poor posture, and achieve simple adjustment, excellent temperature compensation performance, and high-precision adjustment. Effect

Active Publication Date: 2022-02-08
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a possibility that the biased weight of the balance with hairspring (piece weight り) occurs, and the fluctuation of the vibration period T due to the posture of the balance with hairspring becomes large (a so-called posture difference occurs).

Method used

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  • Temperature compensated balance springs, movements and timepieces
  • Temperature compensated balance springs, movements and timepieces
  • Temperature compensated balance springs, movements and timepieces

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0075] [clock]

[0076] figure 1 It is an external view of the clock 1. In addition, in each of the figures shown below, in order to make the drawings easier to see, the illustration of some of the timepiece components is omitted, and each of the timepiece components is shown in simplified form.

[0077] Such as figure 1 As shown, the timepiece 1 of this embodiment is constructed by incorporating the movement 2, the dial 3, various hands 4-6, and the like into the timepiece case 7.

[0078] The timepiece case 7 includes a case body 11 , a case cover (not shown), and a cover glass 12 . 3 o'clock position on the side of the housing main body 11 ( figure 1 The right side of ) is provided with crown 15. The crown 15 is a part for operating the movement 2 from the outside of the case main body 11 . The crown 15 is fixed to an arbor 19 , and the arbor 19 is inserted into the case main body 11 .

[0079] [movement]

[0080] figure 2 It is a plan view of the movement 2 viewe...

no. 2 Embodiment approach

[0176] Next, a second embodiment of the present invention will be described. Figure 18 It is a perspective view of the adjustment part 100 of 2nd Embodiment. Figure 19 is along Figure 18 Sectional view of line XIX-XIX in.

[0177] Such as Figure 18 , Figure 19 As shown, the adjustment unit 100 of this embodiment is different from the above-mentioned first embodiment in that the weight part 122 is configured to be directly screwed to the bimetal 121 .

[0178] At the end portion of the bimetal 121, a male thread portion is formed on the outer peripheral surface.

[0179] The weight part 122 is formed in a cylindrical shape arranged coaxially with the second axis O2. A female thread portion is formed on the inner peripheral surface of the weight portion 122 . As a result, the weight portion 122 is screwed to the end portion of the bimetal 121 .

[0180] In the present embodiment, by rotating the weight part 122 in the tightening direction with respect to the bimetal ...

no. 3 Embodiment approach

[0184] Next, a third embodiment of the present invention will be described. Figure 20 It is a perspective view of the adjustment part 100 of 3rd Embodiment. Figure 21 is along Figure 20 Sectional view of line XXI-XXI in.

[0185] Such as Figure 20 , Figure 21 As shown, in the present embodiment, the weight portion 122 includes a cylindrical portion 200 and a weight main body 201 .

[0186] The cylindrical portion 200 is arranged coaxially with the second axis O2. A slit 202 opened on the proximal end surface in the second axial direction is formed in the cylindrical portion 200 . The slit 202 extends in the direction of the second axis and ends at the middle portion of the cylindrical portion 200 . In the present embodiment, a pair of slits 202 are formed at portions of the cylindrical portion 200 that face each other in the second radial direction. A portion of the cylindrical portion 200 located between the slits 202 in the second circumferential direction is con...

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Abstract

The present invention provides a temperature compensation type balance with hairspring mechanism, movement and timepiece, which can adjust the correction amount of the temperature coefficient simply and with high precision, and thus have excellent temperature compensation performance. The temperature-compensated balance with hairspring of the present invention includes: a main body of the balance with hairspring, which has a balance shaft (61) extending along the first axis (O1), and rotates around the first axis (O1) by the power of the hairspring (63). O1) rotation; and an adjustment part (100), which has a bimetallic piece (121) and a weighted part (122), the bimetallic piece (121) is rotationally symmetrical about the first axis (O1) from the main body of the balance wheel hairspring mechanism The positions are respectively extended along the second axis (O2), and the bimetal sheet (121) is formed by laminating materials with different thermal expansion rates in the direction crossing the second axis (O2), and the weight part (122) Attached to the bimetal (121) so as to be movable in the direction of the second axis along the second axis (O2).

Description

technical field [0001] The invention relates to a temperature-compensated balance with hairspring, a movement and a watch. Background technique [0002] A balance with hairspring functioning as a governor of a mechanical timepiece includes: a balance shaft extending along an axis; a balance wheel fixed to the balance shaft; and a hairspring. The balance shaft and the balance wheel periodically rotate (vibrate) forward and backward around the axis as the balance spring expands and contracts. [0003] For the above-mentioned balance with hairspring, it is important to set the vibration cycle within a predetermined value. If the vibration period deviates from the specified value, the rate of the mechanical timepiece (the speed of the timepiece) will change. [0004] The vibration period T of the balance with hairspring is represented by the following equation (1). In formula (1), I represents the "moment of inertia" of the balance with hairspring mechanism, and K represents ...

Claims

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Application Information

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