Seiko Instruments Inc

Miei Sato

Takashi Niwa

Matsuo Kishi

Masayuki Koda

Hiroki Uchiyama

Naoki Amano

Natsuki Miyoshi

A detent escapement for a mechanical timepiece includes an escape wheel, a balance mounted for undergoing oscillation movement about a balance staff, a blade and an actuating spring. The balance has an unlocking stone and has an impulse jewel for contacting a wheel tooth of the escape wheel. The blade has a locking stone for contacting the wheel tooth of the escape wheel and is supported for undergoing movement in approaching and separating directions relative to the escape wheel. The actuating spring is configured to contact the unlocking stone and is mounted for undergoing elastic deformation along the approaching and separating directions with respect to the blade. An adjustment mechanism adjusts a projecting amount of a spring tip portion of the actuating spring from a blade tip portion of the blade.

Detent escapement for timepiece and mechanical timepiece

A sliding component has a multi-layer structure having a sliding portion configured to undergo sliding contact with a surface of another component different from the sliding component. A lubricating oil retaining/supplying structure retains a lubricating oil and supplies the lubricating oil to the sliding portion during sliding contact between the sliding portion and the surface of another component irrespective of a contact angle between the sliding portion and the surface of the another component.

Sliding component and timepiece

A detent escapement for a timepiece capable of decreasing energy loss with respect to a free oscillation of a balance and improving a timekeeping accuracy is provided. In addition, a detent escapement of a timepiece capable of realizing miniaturization and suppressing variations in the accuracy of a finished product due to assembly errors is provided. A one-side actuating spring of a detentis formed so that a maximum stress portion, which is generated at the time of operating due to the contact of an unlocking stonewhen a balanceis return-rotated, is present to be perpendicular to a first straight line Lwhich connects the center of the balance staffand a fulcrumof the blade, and to be the side opposite to the balance by a second straight line Lwhich passes through the fulcrum

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Chiba, Japan

Miei Sato