Self-Cleaning Tapered Gear Sets
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Gear sets used to drive paper feed rollers or the like are subject to accumulation of paper dust. As the paper dust builds up, it impacts in the root space of the gears until the compression force required to impact any additional dust exceeds the load that the paper feed drive motor may have. At this point, paper feed failures occur. This disclosure describes tapered addenda and bottom lands across the face width of the gears to provide an increasing tapered gear clearance that allows lateral extrusion of dust and debris to occur as a natural result of the gear face forces. Fig. 1 illustrates an end view of a typical gear set consisting of gears 1 and 2 immeshed with one another. The edges or addenda of the gear teeth are tapered as shown by the the tapered surface 4 as are the lands for the gear teeth 3.