Original Publication Date: 1982-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In electrophotographic printing, a new photoconductive belt is frequently mounted on rollers to replace the old photoconductive belt. It is well known that belts, entrained about a plurality of spaced rollers move in a direction substantially normal to their desired path of travel due to imperfections in the belt and the rollers and the nonperpendicularity of roller axes to the desired path of travel. These imperfections introduce a velocity component substantially normal to the desired path of travel which causes the belt to move in a lateral direction. This undesired effect can be utilized to load a new photoconductive belt therefrom. More specifically, if the roller is tapered, the belt moves towards the larger diameter end of the roller. One way to achieve a variable taper is to have a roller comprising a number of teeter-totter elements pivoted on a ring about the center of the roller and having ramps on the underside (inside) of their outer ends. A cam moving axially rocks the teeter-totter elements to increase the diameter at the other end. An elastomeric sleeve stretched over the entire roller surface acts as both a return spring for the cam and as a smoothing element to minimize the discontinuities between the surface elements. In this way, the taper of the roller may be configured so as to both load and unload the belt therefrom.