著者

茂木 正俊 高橋 理 塩原 研治

出版者

一般社団法人 日本時計学会

雑誌

マイクロメカトロニクス (ISSN:13438565)

巻号頁・発行日

vol.52, no.198, pp.13-22, 2008-06-10 (Released:2017-11-09)

参考文献数

2

被引用文献数

1

---

This paper describes an air-viscous slow governor used in Spring Drive Sonnerie. Spring Drive movement makes no noise during hand movement. This is an ideal condition for installing mechanism for striking a bell. Japanese Buddhists' prayer bell "orin" was chosen for the sound source. Our objective was to create a sonnerie that offered the resonance and the clear tone of an orin. The reverberation resonance of an orin is produced by a hammer that strikes the bell at approximately 3-second interval. Along with the smoothly flowing second hand, the sound imparts a sense of slow and tranquil flow of time. To achieve the ringing tone of an orin amid a tranquil stillness, we developed a non-contact slow governor that made virtually no noise. The key to the "silent" slow governor is the wings around the rotor that produce resistance caused by viscosity of the air. This rotor turns at a constant speed at which the reactive force of the main spring and the viscous resistance caused by the air are balanced.

著者

茂木 正俊 中田 克美 広瀬 信行

出版者

一般社団法人 日本時計学会

雑誌

マイクロメカトロニクス (ISSN:13438565)

巻号頁・発行日

vol.58, no.210, pp.7-18, 2014-06-10 (Released:2017-11-09)

---

We have developed a minute repeater mechanism based on the SPRING DRIVE movement. Within the limited dimensions of a movement, we have increased the duration time to a maximum and moreover, we have founded the means shown below in order to avoid the troubles caused by wrong operations of users. 1. By the means of two main spring barrels placed in series, we have increased the running time of the watch. 2. By modifying the minute repeater mechanism and turning it into the Sonnerie center wheel, it was possible to remove the minute repeaters spring and draw the mechanical energy directly from the main spring barrel. 3. While the minute repeater mechanism works, if the lever that releases the center wheel is used, the crown cannot be pulled out because it is equipped with a security system in order not to activate the minute repeater when the crown is in "pull out" position.

著者

茂木 正俊 高橋 理 塩原 研治

出版者

一般社団法人日本時計学会

雑誌

マイクロメカトロニクス (ISSN:13438565)

巻号頁・発行日

vol.52, no.198, pp.13-22, 2008-06-10

被引用文献数

1

---

This paper describes an air-viscous slow governor used in Spring Drive Sonnerie. Spring Drive movement makes no noise during hand movement. This is an ideal condition for installing mechanism for striking a bell. Japanese Buddhists' prayer bell "orin" was chosen for the sound source. Our objective was to create a sonnerie that offered the resonance and the clear tone of an orin. The reverberation resonance of an orin is produced by a hammer that strikes the bell at approximately 3-second interval. Along with the smoothly flowing second hand, the sound imparts a sense of slow and tranquil flow of time. To achieve the ringing tone of an orin amid a tranquil stillness, we developed a non-contact slow governor that made virtually no noise. The key to the "silent" slow governor is the wings around the rotor that produce resistance caused by viscosity of the air. This rotor turns at a constant speed at which the reactive force of the main spring and the viscous resistance caused by the air are balanced.