Abstract: An adjustment mechanism for a timepiece display including an input wheel driving a control wheel controlling the position of a first display member, and including a differential mechanism which includes a drive wheel set retained by a jumper and pivotable via the first input wheel, to drive a planetary wheel meshing with the control wheel and pivoting off-centre with respect to a planetary wheel holder friction-mounted on a frame, the differential mechanism multiplying by a particular factor the rotation between one of the inputs and the output of the differential mechanism when the other input is stationary, and the planetary wheel holder includes manipulating device allowing a watch technician to release the friction to change the angular position of the planetary wheel and thus of the control wheel for correct indexing thereof with respect to another display member.

Abstract: A perpetual calendar clock includes an outer case that has a month window, a date window, a day-of-the-week window, and a clock window formed on the surface thereof. The clock includes a rotatory wheel set, a driving apparatuses, a clock-control unit, and a battery set, which are all fixed within the hollow outer case. The rotatory wheel set has a month wheel, a date wheel, and a day-of-the-week wheel, which, respectively, are aligned to the month window, the date window, and the day-of-the-week window of the outer case. Also, the clock-control unit is aligned to the clock window. The clock-control unit sends a signal for controlling and actuating deflecting rods, micro switches, and touch switches of the driving apparatuses so that the driving apparatuses act with the buses on a flexible circuit board disposed within one of the wheels; then, another control signal is sent to another wheel.

Abstract: A perpetual calendar structure comprising an outer casing, an interior frame, a driver, a clock control and a power source including a battery, in which the outer casing has windows for display of date, month, weekday and time, the interior frame in incorporated with a date display set, a month display set, and a weekday display set each aligning with their respective windows, the clock control is aligned with the time display window, and is used to give a signal at the end of each rotation of a cycle of 12-hour period to control the driver to cause a weekday driver to turn the weekday display set to next plate showing a weekday and A.M. or P.M., a date driver to turn the date display set to next plate showing a date after every two weekday plates are turned, and a month driver to turn the month display set to next plate showing a month after 31 date display plates are turned automatically without the need of manual control.

Abstract: This invention is a combination of known elements for a new use. This is an adaptation of the old shadow light principle coupled with time to cause three different light apertures to be aligned in a lighted window effect, thereby indicating a previously programmed marking to remind the owner of hourly, daily or weekly radio, television programs, appointments or meetings.