Abstract: A transport mechanism for feeding cylindrical or prismatic parts of discrete or indefinite lengths at a rapid rate and with accurate position control, through a work station for treatment by automatic inspection devices, part counters, roll printers, or other processing apparatus. A system of opposed belts and guides feeds the parts without rotation and without appreciable slippage at a uniform rate along a fixed feed axis, in such manner that the lateral relationship of the parts to the axis depends on their degree of conformity to a correct geometrical form. This facilitates the inspection of part form as well as dimensions, and improves the uniformity of other treatments. An arrangement of nip rolls driven at reduced speed separates discrete parts uniformly to ensure correctly-phased registration with inspection, rejection, counting, printing, or other treatment devices. The mechanism is readily adjustable to accept parts of different diameters or transverse dimensions.