Granted Patent B2

US 8,041,271 · App. 12/046,326 · Granted Oct 18, 2011

Abstract

Claims (49)

1. A system for preventing toner scatter in a laser printer comprising:

a laser printer toner cartridge having a hopper section adapted to contain nonmagnetic toner particles and a developing roller adapted to receive non-magnetic toner particles from the hopper section;

the hopper section having an orifice adapted to permit flow of the non-magnetic toner particles from the hopper section to the developing roller;

a toner regulating member operatively positioned to control flow of the non-magnetic toner particles through the orifice from the hopper section to the developing roller; and,

a generally L-shaped shield having a first leg adhered to the toner regulating member, a second leg extending in a direction over a portion of the developing roller and an angle φ defined by and included between the first leg and second leg, wherein the L-shaped shield includes a material having triboelectric properties sufficient to cause the toner particles, when charged, to be repelled from the L-shaped shield;

and the shield positioned adjacent the orifice and adapted to inhibit flow of the nonmagnetic toner particles away from the developing roller.

2. The system of claim 1 wherein the angle φ is in the range of about 70 to 130 degrees.

3. A system for preventing toner scatter in a laser printer comprising:

a laser printer toner cartridge having a hopper section adapted to contain nonmagnetic toner particles and a developing roller adapted to receive non-magnetic toner particles from the hopper section;

the hopper section having an orifice adapted to permit flow of the non-magnetic toner particles from the hopper section to the developing roller;

a toner regulating member operatively positioned to control flow of the non-magnetic toner particles through the orifice from the hopper section to the developing roller; and,

a generally L-shaped shield having a first leg adhered to the toner regulating member, a second leg extending in a direction over a portion of the developing roller and an angle φ defined by and included between the first leg and second leg;

and the shield positioned adjacent the orifice and adapted to inhibit flow of the nonmagnetic toner particles away from the developing roller;

the developing member includes electrically conductive material and the developing member is electrically connected to a negative electrical bias;

the toner regulating member includes electrically conductive material and the toner regulating member is electrically connected to a negative electrical bias;

and, the shield includes a negative triboelectric material that is in electrical contact with the toner regulating member.

4. A system for preventing toner scatter in a laser printer comprising:

a laser printer toner cartridge having a hopper section adapted to contain nonmagnetic toner particles and a developing roller adapted to receive non-magnetic toner particles from the hopper section;

the hopper section having an orifice adapted to permit flow of the non-magnetic toner particles from the hopper section to the developing roller;

a toner regulating member operatively positioned to control flow of the non-magnetic toner particles through the orifice from the hopper section to the developing roller; and,

a generally L-shaped shield having a first leg adhered to the toner regulating member, a second leg extending in a direction over a portion of the developing roller and an angle φ defined by and included between the first leg and second leg; and the shield positioned adjacent the orifice and adapted to inhibit flow of the nonmagnetic toner particles away from the developing roller;

the developing member includes electrically conductive material and the developing member is electrically connected to a positive electrical bias;

the toner regulating member includes electrically conductive material and the toner regulating member is electrically connected to a positive electrical bias; and,

the shield includes a positive triboelectric material that is in electrical contact with the toner regulating member.

5. The system of claim 1 wherein the first leg of the L-shaped shield is adhered to the toner regulating member by tape.

6. The system of claim 1 wherein the first leg of the L-shaped shield is adhered to the toner regulating member by tape having adhesive on two sides, one side being adhered to the shield and the other side adhered to the toner regulating member.

7. The system of claim 1 wherein the L-shaped shield is of a unitary construction.

8. A system for preventing toner scatter in a laser printer comprising:

a laser printer toner cartridge having a hopper section adapted to contain nonmagnetic toner particles and a developing roller adapted to receive non-magnetic toner particles from the hopper section;

the hopper section having an orifice adapted to permit flow of the non-magnetic toner particles from the hopper section to the developing roller;

a toner regulating member operatively positioned to control flow of the non-magnetic toner particles through the orifice from the hopper section to the developing roller; and,

a generally L-shaped shield having a first leg adhered to the toner regulating member, a second leg extending in a direction over a portion of the developing roller and an angle φ defined by and included between the first leg and second leg; and the shield positioned adjacent the orifice and adapted to inhibit flow of the nonmagnetic toner particles away from the developing roller; wherein the L-shaped shield comprises:

a flat sheet made of a triboelectric material;

a first length of tape having adhesive on a first side and on a second side, the first side of which is adhered to the sheet of triboelectric material;

a rod adhered to the second side of the tape;

a second length of tape having adhesive on a first side and on a second side, the first side of which is adhered to the rod; and,

the second side of the second length of tape adhered to the regulating member.

9. The system of claim 1 wherein the regulating member has a bottom edge extending along the orifice and the second leg of the L-shaped shield is spaced about 0.005 inch to about 0.500 inch from the bottom edge of the regulating member.

10. The system of claim 1 wherein the L-shaped shield includes a PVC material.

11. A method for inhibiting non-magnetic toner particles in a operating laser printer from scattering from a predetermined flow path in the laser printer to an undesirable location in the laser printer comprising:

providing a laser printer toner cartridge having a hopper section adapted to contain non-magnetic toner particles and a developing roller adapted to receive nonmagnetic toner particles from the hopper section;

providing the hopper section with an orifice adapted to permit flow of the nonmagnetic toner particles from the hopper section to the developing roller;

regulating the flow of the non-magnetic toner particles from the hopper section to the developing roller;

generating an electrostatic charge of a predetermined polarity on the non-magnetic toner particles to yield electrically charged toner particles;

providing a shield having a capability to hold an electrostatic charge on its surface, wherein the shield is made of a PVC material;

creating an electrostatic charge on the surface of the shield, the electrostatic charge on the surface of the shield being of the same polarity as the electrically charged non-magnetic toner particles;

positioning the shield in the laser printer at a location near the orifice; and,

deflecting scattered charged non-magnetic toner particles from the shield toward the developing roller.

12. The method of claim 11 wherein the shield is L-shaped.

Assignments (8)