Patent ID: 7992817

Claim:
A belt retractor for a safety belt system, including a frame ( 12 ), a belt reel ( 14 ) rotatably mounted in said frame ( 12 ), a locking mechanism ( 17 ) which couples said belt reel ( 14 ) in a restraint case to said frame ( 12 ), a force limiter arranged between said belt reel and said locking mechanism whereby the force limiter allows a certain rotation of the belt reel after locking of the locking mechanism on account of forward movement of the occupant, and a belt webbing unwinding measuring means ( 34 ) which includes a signal transmitter ( 30 ) and at least one sensor ( 32 ), said sensor ( 32 ) being associated with said signal transmitter ( 30 ) and detecting a change in a magnetic field, said signal transmitter ( 30 ) including a separate wheel ( 42 ) which is coupled to said belt reel ( 14 ), said wheel ( 42 ) being disposed axially adjacent to said belt reel ( 14 ) and having a rotational axis that is non-coaxial to the rotational axis of the belt reel, at least upon activation of said locking mechanism ( 17 ) said signal transmitter ( 30 ) being coupled to said belt reel ( 14 ) such that it generates a signal upon rotation of said belt reel ( 14 ).