A motor normally drives a gear-train which controls the hands when the motor is acted upon by pulses it receives from a driving circuit and which come from a divider and a quartz oscillator. In order to set an alarm to the desired time, a stem is moved by means of a crown to a setting position. The gear-train...http://www.google.com/patents/US4459031?utm_source=gb-gplus-sharePatent US4459031 - Electronic timepiece
