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Patent Searching and Data


Title:
HYDRAULIC CLOCK
Document Type and Number:
Japanese Patent JP2500508
Kind Code:
B2
Abstract:

PURPOSE: To obtain a hydraulic clock which displays at a high accuracy with a small motive power by controlling a motor by detecting the hydraulic turbine rotating error from the index pulse of the rotating speed of a hydraulic turbine and the standard pulse of a standard clock, and increasing or decreasing the water volume in a water reservoir so as to correct the error.
CONSTITUTION: A water level sensor 54 detects the water level of a water reservoir 3, and when the water level reaches a specific height or higher, or less than a specific amount, a motor 52 is stopped, and the pumping up of the water by a water supply pump 53 is stopped. And an index pulse generated by a rotation speed detector 46, and a standard pulse generated by a standard clock 44 are compared, so as to detect an error of the rotating speed of a hydraulic turbine 2, and the drive of the motor 52 is controlled depending on this error, to increase or decrease the water amount in the water reservoir 3, so as to correct the error. Consequently, the error can be corrected by a small motive power, and a highly accurate display can be made.


Inventors:
IIZUKA KAZUO
Application Number:
JP30343991A
Publication Date:
May 29, 1996
Filing Date:
November 19, 1991
Export Citation:
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Assignee:
SEIKOSHA KK
International Classes:
G04B1/26; G04B45/00; G04F5/00; (IPC1-7): G04B1/26; G04B45/00
Domestic Patent References:
JP61156416A
JP1183711A
JP2280084U
Attorney, Agent or Firm:
Kazuko Matsuda