CHARGED SELF LUBRICATING CLEANING BLADE
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
AbstractIn certain xerographic blade cleaning subsystems, it is often desirable to continuously maintain small amounts of toner particles on the cleaning blade to provide dry lubrication. Insufficient blade lubrication leads to accelerated blade wear, reduced blade life, cleaning deterioration and print quality defects.
XEROX DISCLOSURE JOURNAL
CHARGED SELF LUBRICATING Proposed Classification CLEANING BLADE U.S. C1.3551299 Ronald E. Godlove Int. C1. G03g 21/00
XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994 145
CHARGED SELF LUBRICATING CLEANING BLADE (Cont'd)
In certain xerographic blade cleaning subsystems, it is often desirable to continuously maintain small amounts of toner particles on the cleaning blade to provide dry lubrication. Insufficient blade lubrication leads to accelerated blade wear, reduced blade life, cleaning deterioration and print quality defects.
The present disclosure provides for a charged self lubricating cleaning blade system having long blade life properties and which system is shown in an exemplary embodiment in the accompanying diagrammatic cross-sectional Figure and described below.
A primary cleaning blade 616 is located upstream in the process direction from a secondary cleaning blade 618. Primary blade 616 removes most of the residual particles from the surface of belt 110. Secondary blade 618 accumulates particles not removed by primary blade 616. A photodetector 150 and light source 160 oppose each other upstream from the cleaning edge of secondary cleaning blade 618.
Secondary blade 618 accumulates particles in a location that blocks the optical path between light source 160 and photodetector 150, which then sends a signal to controller 196 to control actuator 620 to vary the amount of pressure applied to primary blade 616.
Cleaning blades 616 and 618, each have an edge in frictional contact with the surface of belt 110 at an angle a (where a= 180" -(B +go"). Primary blade 616 is configured in the "doctoring mode," having an angle a1 of approximately 10" to 25", with a preferred angle of approximately 15" when the pressure on primary blade 616 is approximately 35 gramdcm.
Secondary blade 618 is configured in the "wiping mode," having an angle a2 of approximately 65" to 80°, with a preferred angle a2 of approximately 75" when the pressure on secondary blade 618 is approximately 35 grams/cm. In general, the secondary blade pressure for a given angle a will be less than that of the primary blade loading, because toner securely fixed on belt 110, and therefore passing between the blade and belt 110, acts as a lubricant, and the secondary blade will see less of this securely fixed toner than the primary blade sees.
Secondary blade 618 accumulates residual particles 630 photoreceptor belt 11 imaging operates over a period of time. The copier or printing machine clears accumulated toner by periodically blowing compressed air, by swabbing with a piece of plastic foam or other material, or, when not generating copy output, by momentarily camming secondary blade 618 away from belt 110, allowing the accumulated particles to be carried by belt 110 t...