Manual winding gear train, clock machine core and clock possessing the gear train

Abstract

The invention provides a manual winding gear train, a clock machine core and a clock possessing the gear train capable of making the machine core itself set a winding torque below a specified level. The manual winding gear train of the machine core(2) of the clock(3) comprises a plurality of gears(60,70,41,42) meshed with each other to transmit the rotation of a shaft to a square hole wheel(37), an input side part(60) possessing an input side friction fastening part(67(H1)) and an output side part(70) possessing an output side friction fastening part(72(H2)). The input side part(60) and the output side part(70) are arranged correspondingly to each other at the respective friction parts and are rubbed and fastened with each other at the correspondingly arranged part. The manual winding gear train of the machine core(2) of the clock(3) also comprises an elastic mechanism(80) enabling one friction fastening part(72) to pushing the other friction fastening part(67).

Description

technical field [0001] The present invention relates to a manual winding gear train, a watch movement having the same, and a watch having the same. Background technique [0002] In a hand-wound timepiece among mechanical timepieces, when the mainspring is wound up to full winding, the winding torque increases sharply and a sense of tightness is obtained. However, if a stronger winding force (torque) is applied, related parts may be damaged and winding may not be possible. That is, a manually wound timepiece generally does not have a torque limiting function that specifies an upper limit value of the winding torque, that is, a safety function or a damage prevention function. [0003] On the other hand, in self-winding timepieces, a sliding appendage is provided in the barrel, and the automatic winding of the mainspring is performed until the winding torque reaches a prescribed level predetermined by the appendage, on the contrary, when the When the winding torque exceeds a ...

AI Technical Summary

Problems solved by technology

[0006] However, in the method proposed in this patent document 2, in particular, instead of specifying the upper limit of the torque within the range of the movement of the timepiece, the function can be initially exhibited only after the crown has been installed. It is therefore also difficult to conduct desired experiments, etc.

In addition, it is difficult to avoid the complexity of the structure of the crown, which leads to the hypertrophy of the crown to an unnatural level

Furthermore, if such a crown is mass-produced, it is not easy to maintain the slip torque (threshold torque generated by slip) accurately as specified.

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