Browse Prior Art Database

Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


A cleaning blade may be used to remove residual developer from a reusable electrostatographic drum. If the cleaning blade is maintained in pressure contact with the drum during idle periods, cold flow of the drum surface may be witnessed causing a linear depression on the drum surface which ultimately gets filled with toner and eventually causes a line to appear on the output copy. The figure illustrates a configuration which may be used to magnetically retract a cleaning blade from the drum surface during idle periods by employing the fact that like magnetic poles repel1 each other. The cleaning blade mounting 1 includes blade 2 and linear magnet 3 mounted on top of the blade adjacent the drum surface. The cleaning blade assembly is pivotally mounted about axis 4. When in use, the cleaning blade is in contact with the surface of drum 5. When not in use, the blade is magnetically repelled by moving magnet 6 into position inside the drum opposite the magnet 3 on the cleaning blade assembly. The repelling action is provided with linear magnets 3 and 6 being selected of the same polarity. When being used in a copying mode, the magnet 6 inside the drum is moved to a stored position shown in phantom in the figure eliminating the magnetic repulsion between magnets 6 and 3.