An indexing apparatus for changing automatically and rapidly calendar information of a clock includes an indexing assembly having both day and date means, each engageable with for driving respective day and date discs provided with calendar indicia. A cam driven by the drive train of the clock mechanism rotates through a full revolution each 12-hour period. A member including a plurality of gear teeth arranged in a sector is mounted for pivota movement against the bias of a spring which positions the member in the path of movement of the cam. The indexing assembly, further, includes an element formed by a disc and a sector gear which is driven in opposite directions by the member whose gear teeth are in driving engagement therewith. The disc of the element includes a pair of substantially diametrically oppositely disposed notches having oppositely inclined ramps between the upper and lower surfaces of the clutch disc. The components of the indexing assembly are mounted in a stack with the day means between the date means and the element. The day means includes a pair of follower projections which normally are disposed within the notches, the day means being movable with the element in one direction to index the day disc through a partial revolution yet will idle upon movement of the element in the other direction whereby the teeth ride out of the notches along the ramps. Means are provided to prevent movement of the day and date means during idling. The day disc includes a plurality of projections which sequentially engage the date means so that upon each second index of the day means the date disc undergoes an indexing movement in the one direction. The calendar information, also, may be changed selectively by a clutch arrangement activated by a setting stem.
The invention is a timepiece calendar mechanism for displaying the date and the day of the week, including a date indicator in the form of an internally toothed crown. The date indicator is driven by a first drive wheel having an external toothing so as to be able to be driven about an axis of rotation by a wheel set secured to an hour wheel of the timepiece. The toothing includes a prominent tooth, longer than the others, which abuts against a tooth of the inner toothing of the date indicator to move it forward one day in a time interval located around a determined time of the day. The mechanism also includes a day of the week indicator that moves forward one day during the time interval.
The invention is a timepiece calendar mechanism for displaying the date and the day of the week, including a date indicator in the form of an internally toothed crown. The date indicator is driven by a first drive wheel having an external toothing so as to be able to be driven about an axis of rotation by a wheel set secured to an hour wheel of the timepiece. The toothing includes a prominent tooth, longer than the others, which abuts against a tooth of the inner toothing of the date indicator to move it forward one day in a time interval located around a determined time of the day. The mechanism also includes a day of the week indicator that moves forward one day during the time interval.
The mechanism for transmission of axial and rotative movements between two portions of a stem with offset axes, includes a movable assembly movable axially. The section portion of the stem carries a second pinion and is pivoted on said movable assembly but it is axially secured to, this movable assembly. The first portion of the stem is pivoted on the movable assembly but axially secured to this latter and is secured to a first pinion, one or an uneven number of reverser(s), pivoted on the movable assembly kinematically connects the first pinion to the second pinion.
A device for automatically correcting the date indicator of an electro-mechanical timepiece to the first date of the next month at the end of each month. A pulse driven motor advances the date indicator one date in response to a plurality of pulsed drive signals with the motor advancing one step for each drive signal pulse, and at a speed corresponding to the drive signal frequency. A fixed number of drive signal pulses are applied to the motor each month to advance the date indicator through the dates of each month to the first date of the next month. A predetermined number of the drive signal pulses, corresponding to the number of dates of each month, are applied to the motor at a normal advance frequency normally to advance the date indicator. The remaining number of the drive signal pulses, for each month having less than 31 days are applied to the motor at a rapid advance frequency which is greater than the normal advance frequency, rapidly to advance the date indicator and indicate the first date of the next month.
