A time-detecting system for a digital interval timer comprises a plurality of detecting wheels mounted for rotation independently of each other upon a detection shaft. The time-indicating wheels of the timer are also mounted for rotation independently of each other upon the detection shaft and each timing wheel is positioned on the shaft adjacent one of the detecting wheels. Each detecting wheel includes a set of projections which extend toward its associated timing wheel and each timing wheel has a corresponding set of holes for receiving therein the projections when the detecting wheels and timing wheels are angularly aligned with respect to each other. A biasing spring urges the detection shaft in one direction to force the detecting wheels against their associated timing wheels so that when the projections and holes on each set of wheels are in alignment, the biasing spring will force the detection shaft in one direction causing the projections to slide into their respective holes. The movement of the detection shaft thus provides an output indicating that the reference time set in the timer coincides with the actual time displayed by the time-indicating wheels.
An alarm vibrator control mechanism for a clock timer wherein an elongated lever extends along the lower portion of the timer for releasing an alarm vibrator at a preset time. The elongated lever is controlled by a selector shaft mechanism which is positioned at one side of the timer, a centrally located 12 hour alarm time gear and a disc cam which is connected to a units shaft at the other side of the timer. The 12 hour alarm time gear tilts the vibrator shutoff lever forwardly a few minutes before the alarm time and then the disc cam moves a right side portion of the elongated lever downwardly at the alarm time to release the elongated alarm shutoff lever from a notch which is formed in a base plate.
