A device for limiting the number of revolutions of a shaft for a rotary drive for a sliding-lifting roof of an automobile is proposed. By the cooperation of a detent bolt, actuated by an actuating knob with a spring-loaded blocking pin and with a rotationally driven blocking ring, the shaft is blocked in rotation not only in the lid closure position, but also by a special construction of the blocking ring, in intermediate sliding and/or lifting positions of the sliding lid.
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