Title:
デテント脱進機と機械式時計
Document Type and Number:
Japanese Patent JP5441168
Kind Code:
B2
Abstract:
A detent escapement for a timepiece includes an escape wheel, a balance having an unlocking jewel, and a blade. A rotation reference line is formed by a straight line passing through a rotation center of the blade in a state where the balance is at an oscillation center. In order to balance (1) a sum total of the effects on rotational movement of the balance caused by “impulse before dead point” and by “resistance after dead point”, which together comprise the total effect causing the timepiece to advance, and (2) a sum total of the effects on rotational movement of the balance caused by “resistance before dead point” and by “impact after dead point”, which together comprise the total effect causing the timepiece to slow, the unlocking jewel is aligned with the rotation reference line and positioned at a position facing towards a direction farthest from the escape wheel.
Inventors:
Masayuki Koda
Hiroki Uchiyama
Takashi Shinwa
Hiroki Uchiyama
Takashi Shinwa
Application Number:
JP2010053313A
Publication Date:
March 12, 2014
Filing Date:
March 10, 2010
Export Citation:
Assignee:
Seiko Instruments Inc.
International Classes:
G04B15/14; G04B17/06; G04B18/02
Domestic Patent References:
| JP2009510425A | ||||
| JP2005164599A |
Foreign References:
| CH3299A |
Attorney, Agent or Firm:
Kentaro Kuhara
Noriaki Uchino
Nobuyuki Kimura
Koichi Tsujii
Sadao Kumakura
Disciple Maru Ken
Ino Sato
Mitsuru Matsushita
Ichiro Kurasawa
Hiroshi Kitamura
Noriaki Uchino
Nobuyuki Kimura
Koichi Tsujii
Sadao Kumakura
Disciple Maru Ken
Ino Sato
Mitsuru Matsushita
Ichiro Kurasawa
Hiroshi Kitamura