DISPOSITIF DE COMPTAGE DU NOMBRE DE PASSAGES POUR LA LECTURE D'UNE CASSETTE A RUBANS OU FILMS, SUPPORTS DE SONS ET/OU D'IMAGES, OU AUTRES SIGNAUX

摘要

On a backplate (28) of the appts., a locking wheel (17) is partially toothed and operated by a cam (2), a swinging beam (25) and a feeler mechanism (11-14). A locking stop (19) and a rearming lug (22) are provided on the untoothed portion of the locking wheel (17). A tube (26) allows access for a key or pin through an opening (27) for setting the rearming lug (22) against a head (23). The locking wheel (17) may be combined with a toothed counting wheel (7) which counts the operations of the cassette and displays the number in a window. The appts. can be incorporated in a system for determining a number of plays, after which the reeling of tape or film is prevented by such a counter.