Electrophotographic toner and development process using chemically prepared toner
First Claim
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1. A development system for toner comprising:
- a supply of dry developer mixture comprising chemically prepared toner particles and hard magnetic carrier particles;
a non-magnetic, cylindrical shell for transporting the developer from said supply to a development zone, wherein said shell is rotatable or stationary;
a rotating magnetic core of a pre-selected magnetic field strength; and
means for rotating at least said magnetic core to provide for the transport of said toner particles from said shell to an electrostatic image.
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Abstract
Development systems and methods for developing using chemically prepared toners are disclosed. The present invention further discloses developers used in development systems. The use of chemically prepared toners with hard magnetic carrier particles with a non-magnetic, cylindrical shell for transporting developers provides excellent benefits with respect to image quality by reducing granularity and by providing a typically constant, stable developer life as shown by the consistent level of charge to mass over time during operation.
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Citations
23 Claims
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1. A development system for toner comprising:
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a supply of dry developer mixture comprising chemically prepared toner particles and hard magnetic carrier particles;
a non-magnetic, cylindrical shell for transporting the developer from said supply to a development zone, wherein said shell is rotatable or stationary;
a rotating magnetic core of a pre-selected magnetic field strength; and
means for rotating at least said magnetic core to provide for the transport of said toner particles from said shell to an electrostatic image. - View Dependent Claims (2, 3, 4, 5, 6, 17, 18, 19, 20, 21, 22)
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- 7. A method for developing an electrostatic image with chemically prepared toner particles comprising developing an electrostatic image member bearing an electrostatic image pattern by moving the image member through a development zone and transporting developer through the development zone in developing relation with the charge pattern of the moving imaging member by rotating an alternating-pole magnetic core of a pre-selected magnetic field strength within an outer non-magnetic shell, which is rotating or stationary, and controlling the directions and speeds of the core and optionally the shell rotations so that developer flows through the development zone in a direction co-current with the image member movement, wherein said developer comprises charged toner particles and oppositely charged hard magnetic carrier particles.
Specification