Mechanism for driving an indicator
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United States of America Patent
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Jul 14, 2015
Grant Date -
Oct 9, 2014
app pub date -
Nov 9, 2012
filing date -
Nov 11, 2011
priority date (Note) -
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Abstract
Mechanism for driving an information indicator connected to a timepiece movement and varies according to a plurality of periods, during each of which the information changes, step by step, to a maximum value that varies between n and n−m. The mechanism includes a drive wheel including a first set of gear teeth arranged to advance by n steps per period, m retractable teeth borne by the wheel, encoding cams corresponding to the retractable teeth, each cam corresponding to one maximum value n−x of the information, x being between 1 and m, for a period, and a drive unit to provide adequate rotation speed to the cams relative to the wheel such that, when the information reaches a maximum value n−x for a period, x retractable teeth pass in an operative position and then return to an inoperative position, the wheel advancing by x additional steps for the period.
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