Time measurement unit with automatic time correction has a number of time keeping wheels with openings for the passage of a light beam so that it can be reflected from a reflector on the reverse side of the wheel

摘要

Time measurement unit comprises a light emitter, a first wheel (20) with a first side away from the light emitter and a reflector mount on the side of the wheel away from the light emitter. The wheel also has an opening through which incident light can be reflected from the reflector. The time measurement unit can also be designed with a number of wheels (20-23) each with an opening and each with a reflector.