Timepiece with calendar mechanism
AssigneeCitizen Watch Co., Ltd.
InventorsKazunari Kume, Minoru Watanabe, Hideshi Oono, Munetaka Tamaru
Life of this patent
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Abstract
A timepiece with a calendar mechanism for automatically correcting the date-indication at each end of the months with thirty days or less, which comprises first driving means for feeding a date dial, second driving means for selectively driving the date dial and means for controlling the second driving means to energized it at the end of the month with thirty days or less. The second driving means is supplied with a power blanched from the power transmitting route for the first driving means thereby resulting in the simplification in its construction.
Claims6
In a timepiece including a date indicating member which is indexed one step every twenty-four hours to indicate the day of the month, wherein the date indicating member completes one cycle every 31 steps, and wherein a first driving means advances the date indicating member as a power transmission means drives the first driving means, the improvement comprising:
- second driving means driven by the power transmission means;
- indexing means moved by said second driving means for indexing the date indicating member independently of the first driving means to advance the date indicating means at least one step in addition to the advance caused by the first driving means;
- activating means for activating the indexing means;
- control means for operating the activating means when the control means is moved from a first condition, representing a month with 31 days, to a second position, representing a month with less than 31 days;
- and
- means for indexing the control means once every thirty-one steps of the date indicating member to move the control means from the first condition to the second condition, if the subsequent cycle of the date indicating member represents a month having less than 31 days.
Dependencies are inferred from the claim text.