Ferrule, balance wheel and timekeeper

A technology of inner peripheral side and concave part, which is applied in the field of balance wheel and clock and watch, can solve the problem of high welding temperature, achieve the effect of preventing cracking and reducing heat transfer rate

Active Publication Date: 2013-08-21
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Here, the melting point of nickel and nickel alloys is higher than that of metals s...

Method used

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  • Ferrule, balance wheel and timekeeper
  • Ferrule, balance wheel and timekeeper
  • Ferrule, balance wheel and timekeeper

Examples

Experimental program
Comparison scheme
Effect test

no. 2 approach ）

[0159] Next, the collet 50 of the second embodiment will be described.

[0160] Figure 14 It is explanatory drawing of the collet 50 of 2nd Embodiment. and, Figure 14 The state seen from one end surface 56a of the collet 50 is illustrated.

[0161] Figure 15 is along Figure 14 Sectional view of line C-C.

[0162] In the collet 50 of the first embodiment, as the concave portion 60, a stepped portion 61 is formed on one end surface 56a of the collet 50 (refer to Figure 7 ). In contrast, in the collet 50 of the second embodiment, as Figure 14 As shown, a groove 64 is formed on one end surface 56 a of the collet 50 as the recess 60 , which is different from the first embodiment in this point. In addition, detailed descriptions of parts having the same configuration as those of the first embodiment are omitted.

[0163] The groove 64 is formed so as to extend in the circumferential direction of the main body portion 51 on one end surface 56 a of the collet 50 . The ...

no. 3 approach ）

[0177] Next, the collet 50 of the third embodiment will be described.

[0178] Figure 16 It is explanatory drawing of the collet 50 of 3rd Embodiment. and, Figure 16 The state seen from one end surface 56a of the collet 50 is illustrated.

[0179] Figure 17 is along Figure 16 Sectional view of line D-D. In the collet 50 of the first embodiment, as the concave portion 60, one end surface 56a of the two axial end surfaces 56a, 56b of the collet 50 is formed with a stepped portion 61 (see Figure 7 ). In contrast, in the collet 50 of the third embodiment, as Figure 16 As shown, the recessed portion 60 is different from the first embodiment in that a through-hole 66 communicating with both end faces 56 a and 56 b in the axial direction of the inner pile 50 is formed. In addition, detailed descriptions of parts having the same configuration as those of the first embodiment are omitted.

[0180] like Figure 17 As shown, the through-hole 66 is formed so that the one e...

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Abstract

The invention relates to a ferrule, a balance wheel having the ferrule and a timekeeper, and the ferrule is to prevent the formation of cracks in a main body portion when a balance staff is externally press-fitted. The ferrule (50) is used to fix the inner end (43) of a spring (40) to the balance staff (30). The ferrule (50) comprises a main body portion (51) including an opening (53) coaxially externally sleeved on the balance staff (30) and a support portion ( 55) which is formed to protrude toward an outer side in a radial direction of the main body portion (51) and which supports the spring (40), a sealing surface (57) at which the inner end (43) of the spring (40) is welded and which is formed on a side of the support portion (55) in the radial direction, and a concave portion (60) which is formed on at least one end surface (56a) of two end surfaces the support portion (55) in an axial direction of the main body portion (51).

Description

technical field [0001] The present invention relates to a collet, a balance wheel provided with the collet, and a timepiece. Background technique [0002] It is known that a mechanical timepiece is provided with an escapement governor for controlling the rotation of a barrel, a second wheel, a third wheel, and a fourth wheel constituting a dial train. A typical escapement governing mechanism has an escape wheel and a balance wheel. The balance wheel is formed by: a balance wheel; a balance shaft, which becomes the center of rotation of the balance wheel; a hairspring, which rotates the balance wheel by expanding and contracting; and a collet, which fixes the hairspring to the balance shaft. The collet is generally formed in a substantially circular ring shape. The collet includes: a main body fitted on the balance shaft; noodle. [0003] For example, the collet described in Patent Document 1 (corresponding to the "collet" in the claims of the present application) is forme...

Claims

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Application Information

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IPC IPC(8): G04B17/34G04B17/06
CPCG04B17/345
Inventor 井畑贵吉平野圭菊池圣志多田健太郎
Owner SEIKO INSTR INC
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