ウオッチ輪列の高速回転

概要

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Usually the gearing of mechanical watch rotates regularly but by accident, for example, when connection between gear and axle is separated, then it begins to rotate rapidly at a very high speed. This phenomenon is discussed about SEIKO SPORTSMAN SEVENTEEN (mechanical watch for gentlemen) in which transmitting gearing is removed and only indicating gearing (from movement to date indicator) is reserved. The angular velocity is measured by means of optical method and relations betwden angular displacement and angular velocity, etc. are obtained. Furthermore, they are investigated theoretically. Conclusions are : 1. Angular velocity of movement barrel; Mazimum value is about 560 rps when mainspring is wound up by 6 times. Angular velocity ω as function of angular displacement θ is obtained. 2. Angular velocity of hour wheel; Maximum value is about 3900 rps when mainspring is wound up by 6 times. 3. Number of winding up of mainspring and angular displacement of movement barrel ; Angular displacement in number of rotation is about 2 or 3 times larger than number of winding up. 4. Slipping between center wheel pinion and cannon pinion is observed.
社団法人日本時計学会の論文
1987-03-20