Low graininess printing and micr printing with scmb and ea-scmb systems
AssigneeXerox Corporation
InventorsMichael D. THOMPSON, John F. KNAPP, Paul W. MOREHOUSE, JR.
Life of this patent
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Abstract
A specific magnet roll design for high speed semi-conductive magnetic brush (SCMB) development systems for magnetic image character recognition (MICR) printing is provided. The resulting magnetic field distributions include a more uniform radial field and enhance solid area development and halftone graininess without or substantially without bead carryout issues. In addition, this enhancement of solid area development enables magnetic toner in these hill speed SCMB systems that normally would not provide sufficient development latitude for MICR.
Claims20
A development system for a printing machine that uses MICR toner particles, comprising:
- a developer housing for retaining a quantity of the developer;
- at least one magnetic roll having a stationary core with at least one magnet and at least one sleeve that rotates about the stationary core of the magnetic roll;
- and
- a motor coupled to the magnetic roll to drive the rotating sleeve of the magnetic roll in a direction toward a photoreceptor;
- wherein the magnetic roll carries the developer through a development zone in a manner that lowers the magnetic field in a portion of the development zone, facilitating developer transport onto the photoreceptor.
A method of developing, comprising:
- retaining a quantity of developer having MICR toner particles in a developer housing;
- rotating at least one sleeve about a stationary core of at least one magnetic roll, the stationary core having at least one magnet;
- and
- driving the rotating sleeve of the magnetic roll by a motor coupled to the magnetic roll in a direction toward a photoreceptor;
- wherein the magnetic roil carries the developer through a development zone in a manner that lowers the magnetic field in a portion of the development zone, facilitating developer transport onto the photoreceptor.
A xerographic system, comprising:
- a feeding unit for supplying a plurality of sheets;
- a printer unit coupled to the feeding unit for receiving the sheets and transferring a plurality of images onto the sheets;
- an output unit coupled to the printer unit for receiving the sheets with images;
- a developer housing in the printer unit for retaining a quantity of developer having MICR toner particles;
- at least one magnetic roll having a stationary core with at least one magnet and at least one sleeve that rotates about the stationary core of the magnetic roll;
- and
- a motor coupled to the magnetic roll to drive the rotating sleeve of the magnetic roll in a direction toward a photoreceptor;
- wherein the magnetic roll carries the developer through a development zone in a manner that lowers the magnetic field in a portion of the development zone, facilitating developer transport onto the photoreceptor.
Dependencies are inferred from the claim text.