Methods of Eliminating Magnetic Brush Shaft Wear
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
The problem of wear of a printer magnetic brush shaft at the ball bearing/shaft interface is of concern. The mechanism of initiation of wear is electrical arcing. The following methods are suggested to eliminate the arcing: 1) block the path of current flow at the point of obvious wear, 2) provide an alternate (low impedance) path for current flow, and 3) interfere with the voltage-generating mechanism. The first approach is to insert a layer of insulating material between the shaft and bearing. A temporary solution is to apply an insulating elastomer between the two parts. This approach has the added advantage of damping out vibrations which could lead to fretting.