Electrostatic transfer printing
AssigneeDennison Manufacturing Company
InventorsRichard A. Fotland, Jeffrey J. Carrish
Life of this patent
Estimating the term…
Abstract
Electrostatic transfer printing in which a latent electrostatic image is formed on a cylindrical dielectrical member by means of a glow discharge ion source. The image is then toned and pressure-transferred to a receptor, such as a sheet of paper, which is passed between the cylindrical dielectric member and a transfer roller. Scraper blades may be included to remove residual toner from the cylindrical dielectric member and the transfer roller. Means may also be included to erase any latent residual electrostatic image on the cylindrical dielectric member.
Claims35
Electrostatic printing apparatus comprising:
- an imaging member having a conductive core and a dielectric surface layer;
- means for generating ions comprising
- control and driver electrodes separated by a dielectric member, and
- a varying potential applied between the two electrodes to create a glow discharge;
- means for extracting ions from said glow discharge to create a latent electrostatic image on said dielectric surface layer;
- means for toning said latent electrostatic image;
- and
- a transfer roller which nips said dielectric surface layer under pressure, with an image receptor fed through the nip.
Apparatus as defined in claim 26 wherein the erase device comprises a grounded conductor or grounded semiconductor which is maintained in intimate contact with the dielectric surface layer.
Apparatus as defined in claim 26 wherein the erase device comprises two electrodes separated by a solid dielectric member with an alternating potential applied between the two electrodes to create a glow discharge, wherein one of said electrodes is maintained at the same potential as the conductive core of said imaging member.
Electrostatic printing apparatus comprising:
- an imaging member having a conductive core and a dielectric surface layer;
- means for generating ions comprising
- an elongate conductor, a dielectric sheath for said elongate conductor, and a conductive member transversely oriented with respect to said elongate conductor, said conductive member being disposed in contact with or closely spaced from said dielectric sheath, and
- a time varying potential applied between the elongate conductor and the conductive member to create a glow discharge in proximity to the conductive member and dielectric sheath;
- means for extracting ions from said glow discharge to create a latent electrostatic image on said dielectric surface layer;
- means for toning said latent electrostatic image;
- and
- a transfer roller which nips said dielectric surface layer under pressure, with an image receptor fed through the nip.
Dependencies are inferred from the claim text.