in moving conveyors or treadmills with variable inclination , there is provided an apparatus for controlling the conveyor speeds , which apparatus comprises a brake band with the aid of which the circumference of a friction disk fixed for rotation with a driven shaft can be acted upon . with the aid of the control apparatus the moving conveyor is the more strongly braked the higher the inclination is that has been chosen for the moving conveyor so as to guarantee that the predetermined conveyor speed is always observed during operation .