High accuracy timer actuating mechanism in a leaf type digital clock

Abstract

A high accuracy timer actuating mechanism in a leaf type digital clock having a timer, a manually actuatable timer setting drum and a rotating clutch cam cooperating therewith so as to actuate a clutch lever at a set time manually set in the timer setting drum so that a switch for actuating the timer is closed by the actuation of the clutch lever. The clutch lever is provided with an arresting lug which is releasably arrested by an ON-OFF lever so that, when the clutch lever is arrested by the ON-OFF lever, the switch is held opened so as to render the timer to be inoperative. An actuating lever cooperates with the ON-OFF lever and is actuated by a plurality of cam projections of an actuating cam rotated together with the minute indicating drum so as to release the ON-OFF lever from the clutch lever thereby permitting the same to be actuated by the clutch cam. Thus, the switch can be closed only when the ON-OFF lever is released from the clutch lever by the actuation of the actuating cam during the time the clutch cam is actuated by the timer setting drum. This insures the actuation of the timer at a far more accurate time as set in the timer setting drum than the actuation solely by the clutch cam without the provision of the ON-OFF lever, because the clutch lever can be actuated only when it is released from the ON-OFF lever actuated in relation to the minute indicating drum in the order of minutes.

Dependencies are inferred from the claim text.