Automatic roll-up device for a safety belt

Automatic roll-up device and belt arresting device for retarding movement of a safety belt of a vehicle and for arresting movement of the safety belt, which comprises a housing for the roll-up device, a rotatable belt roller shaft mounted in the housing, a belt roller on which the belt is wound mounted on the belt roller shaft, a retarding mechanism for retarding unwinding of the belt comprising a control disc with control teeth at its periphery freely rotatable relative to the belt roller shaft, a vehicle sensitive actuating sensor which is actuated when the vehicle exceeds a permissible acceleration or deceleration for impeding rotation of the control disc by contact with said control teeth, a spring supported by the control disc, driver means rotatable with the belt roller shaft which, after rotation of said control disc is impeded, rotates against the force of said spring around a predetermined angular path to retard movement of the belt while permitting withdrawal of the belt, outer teeth affixed to the housing around the control disc, and a belt sensitive actuating sensor in the form of an inertial mass carried by the control disc for impeding rotation of the control disc by contact with said outer teeth, a belt arresting device through which the belt from said roll-up device passes, and arresting means in said belt arresting device to arrest the belt upon change in movement of the belt therethrough due to retarding the belt by the retarding mechanism.