a drive device for a roof module of a motor vehicle . a drive device of this type , the roof module comprising two movable roof parts , with longitudinally extended tension / compression means for transmitting drive to the roof parts which are driveable by a common drive motor via two output pinions , is known . the output pinions are oriented coaxially with respect to each other , and the output pinions are assigned a change - over device which sets the drive motor into operative connection alternatively with the one or the other output pinion .