Master and slave clocks专利检索-由母钟带动的时钟的驱动机构专利检索查询-专利查询网

Master and slave clocks
申请号	JP16459379	申请日	1979-12-18	公开(公告)号	JPS5687885A	公开(公告)日	1981-07-16
申请人	Seikosha Co Ltd;			发明人	TOKITA MASAYUKI; SHIBAZAKI HISATOSHI;
摘要	PURPOSE: To give a self correcting function to each slave clock by comparing time data from a master clock with the content of a time measuring circuit corresponding to the display time of slave clocks, and when there is a difference between them, by advancing slave clocks by a time corresponding to said difference. CONSTITUTION: The displaying part S of a slave clock is provided with an hour hand cam, a minute hand cam, etc., and outputs a signal a which resets a counter C when it displayed 12 o'clock 00min. In normal time, time data sent from a master clock M is one minute fast than the content of the counter C, and when these are compared (CM) and the difference is detected (A), a pulse is output from a pulse generating circuit P to a driving circuit D and advances the displaying part S by one minute. If the master clock M is set at the true time when the true time and the content of the counter C are different, the pulse generating circuit P generates pulses until the counter C becomes the time of the master clock M. If an updown counter is used for the counter C, correction of both forward and backward directions can be performed. COPYRIGHT: (C)1981,JPO&Japio
权利要求
说明书全文