Measuring cable travel sensor

摘要

A measuring cable travel sensor includes a housing accommodating a measuring cable drum and a rotary spring urging the cable drum in the direction of winding of a measuring cable thereon. At least one braking magnet is arranged either on the cable drum or on the housing to provide for magnetic control of the rotary movement of the cable drum at least in the cable winding-on direction. The cable drum may also carry holding magnets for holding the winding cable into close contact with the peripheral surface of the cable drum. The housing may also have a band extending at least in part around the cable drum for correctly positioning the cable thereon as it is being wound on.