Device for creating a uniform toner layer by electrically charging toner particles
AssigneeHeidelberger Druckmaschinen AG
InventorGerhard Bartscher
Life of this patent
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Abstract
A device for developing an electrostatic latent image located on a movable image carrier, the developing device having a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles, and a rotatably mounted developing roller having a surface for accepting the charged toner particles, includes a device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles; and a method for operating the developing device.
Claims6
A device for developing an electrostatic latent image located on a movable image carrier, comprising:
- a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
- a rotatably mounted developing roller having a surface for accepting the charged toner particles;
- and
- a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles, said field-generating device having a strip structure with radial structures.
A device for developing an electrostatic latent image located on a movable image carrier, comprising:
- a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
- a rotatable mounted developing roller having a surface for accepting the charged toner particles, the surface of the developing roller having a roughness for creating a homogenous toner particle layer;
- and
- a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles;
- said field-generating device having an electrode structure;
- said electrode structure of said field-generating device having electrodes disposed in a mutual grid spacing corresponding to the spacing between the surface of the developing roller and said electrode structure.
A device for developing an electrostatic latent image located on a movable image carrier, comprising:
- a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
- a rotatably mounted developing roller having a surface for accepting the charred toner particles;
- and
- a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles, said field-generating device having a strip structure disposed diagonally relative to a direction of movement thereof.
A device for developing an electrostatic latent image located on a movable image carrier, comprising:
- a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
- a rotatably mounted developing roller having a surface for accepting the charged toner particles;
- a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles, said field generating device having an electrode structure;
- and
- a continuous electrode arranged downline of said field-generating device.
A device for developing an electrostatic latent image located on a movable image carrier, comprising:
- a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
- a rotatable mounted developing roller having a surface for accepting the charged toner Particles, the surface of the developing roller having a roughness for creating a homogenous toner particle layer;
- and
- a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles;
- said field-generating device having a conductor track structure.
A device for developing an electrostatic latent image located on a movable image carrier, comprising:
- a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
- a rotatably mounted developing roller having a surface for accepting the charred toner particles;
- a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles;
- and
- a gap formed with varied size is located between the surface developing roller and said field-generating device;
- wherein said gap is smaller at an input of said field-generating device than at an output of said field-generating device.
Dependencies are inferred from the claim text.