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A seat belt winding apparatus with a rotation detection unit, for detecting a rotation of a belt winder shaft, and a driving unit, controlled by a detection signal from the rotation detection unit so as to apply a winding force to the belt winder shaft. When the seat belt is pulled by a passenger an

A seat belt winding apparatus with a rotation detection unit, for detecting a rotation of a belt winder shaft, and a driving unit, controlled by a detection signal from the rotation detection unit so as to apply a winding force to the belt winder shaft. When the seat belt is pulled by a passenger and a buckle is coupled with a tongue, the driving unit is controlled so that a rotational position of the belt winder shaft in a winding termination state is stored in a storage unit as a reference rotational position, thus establishing a correspondence between a reference rotational position and a count in the storage unit. In the belt fastened state, when the rotational position of the belt winder shaft is shifted from the reference rotational position, the shifted rotational position of the belt winder shaft is compared with the reference rotational position. The belt winder shaft is driven by the driving unit in accordance with the comparison result so as to return the belt winder shaft to the reference rotational position in the belt fastening state. Meanwhile, when the rotational position of the belt winder shaft is shifted from the reference rotational position by the pull-out operation of the seat belt in the condition that the seat belt is not worn by the passenger and the tongue and buckle are not coupled, the winder shaft is driven only in a winding direction so as to return to a reference rotational position in the retracted state.

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An apparatus for winding a seat belt having a tongue and a buckle which are connected to fasten the seat belt comprising: a winder shaft around which the seat belt is adapted to be wound; rotation detection means for detecting a rotation of said winder shaft and producing a signal indicative thereof

An apparatus for winding a seat belt having a tongue and a buckle which are connected to fasten the seat belt comprising: a winder shaft around which the seat belt is adapted to be wound; rotation detection means for detecting a rotation of said winder shaft and producing a signal indicative thereof; control means for receiving said indicative signal from said rotation detection means and producing a driving signal; driving means for driving said winder shaft based on said driving signal; wherein said control means includes: means for storing a final rotational position of said winder shaft in a seat belt fastened state as a first reference rotational position, and for storing an original rotational position of said winder shaft as a second reference rotational position in a complete seat belt wound state in which the seat belt is completely wound by said winder shaft with the tongue and the buckle not being coupled and the seat belt not being fastened; means responsive to said rotation detecting means for determining a shifted rotational position of the seat belt; means for comparing said shifted rotational position with said first reference rotational position in said seat belt fastened state when said rotational position of said winder shaft is shifted during the use of the seat belt, and for comparing a shifted rotational position with the second reference rotational position in said complete seat belt wound state when said rotational position of said winder shaft is shifted by the seat belt being pulled out; and driving signal production means for producing a driving signal based on the result of one of said comparings performed by said comparing means to drive said driving means to restore said predetermined final rotational position, and for producing a driving signal based on the result of said comparing to drive said driving means to restore said original rotational position.