Markem Corporation

Alan H Boyer

Robert A Moore

Graham D Walter

An offset electrostatic imaging process is disclosed which comprises the steps of (a) forming a latent electrostatic image on a dielectric imaging member, said dielectric imaging member being prepared by coating an electrically conductive substrate with a porous layer of a non-photoconductive metal oxide using a deposition process; (b) developing the latent electrostatic image with a developer material which comprises a silicone polymer and from about 0.5 to about 5 percent by weight of a metal salt of a fatty acid; (c) transferring the developed image to an image receiving surface by applying pressure between the dielectric imaging member and the image receiving surface; (d) cleaning the dielectric imaging member using a first cleaning means which is effective to remove developer material residue from above the surface of the porous oxide layer; and (e) further cleaning the dielectric imaging member using a second cleaning means which is effective to remove developer material residue from the pores below the surface of the oxide layer.

Offset electrostatic imaging process

An electrostatic print head system is disclosed which comprises an ion modulated electrostatic print head, means for supplying a flow of heated air having a temperature in the range of from about 120.degree. F. (49.degree. C.) to about 200.degree. F. (93.degree. C.), and means for directing the heated air at, near or through the print head to reduce chemical deposit accumulation at the print head. The print head may comprise a modulated aperture board having a plurality of selectively controlled apertures therein and an ion generator for providing ions for electrostatic projection through the apertures. The electrostatic print head system may be used for forming latent electrostatic images and employed in an electrostatic printer which further comprises a means for developing the latent electrostatic images.

Electrostatic printing utilizing a heated air flow

An offset electrostatic printer is disclosed which comprises (a) an ion modulated electrostatic print head for forming latent electrostatic images, (b) a dielectric imaging member comprising a layer of dielectric material, (c) means for developing a latent electrostatic image on the dielectric imaging member, (d) means for transferring a developed electrostatic image from the dielectric imaging member to an image receiving surface, (e) means for supplying a flow of heated air having a temperature in the range of from about 120.degree. F. (49.degree. C.) to about 200.degree. F. (93.degree. C.), and (f) means for directing the flow of heated air at, near or through the print head and at or near the dielectric imaging member. The flow of heated air reduces the accumulation of chemical deposits in the print head.

Offset electrostatic printing utilizing a heated air flow

An offset electrostatic printer is disclosed which comprises (a) an ion modulated electrostatic print head for forming latent electrostatic images, (b) a dielectric imaging member comprising a layer of dielectric material, (c) means for developing a latent electrostatic image on the dielectric imaging member, (d) means for transferring a developed electrostatic image from the dielectic imaging member to an image receiving surface, (e) means for supplying unheated dehumidified air having a relative humidity of less than about 20 percent at or near ambient temperature, and (f) means for directing the dehumidified air at, near or through the print head and at or near the dielectric imaging member.

Electrostatic printing utilizing dehumidified air

An electrostatic print head system is disclosed which comprises an ion modulated electrostatic print head, a means for supplying unheated dehumidified air having a relative humidity of less than about 20 percent at or near ambient temperature, and a means for directing the dehumidified air at, near or through the print head. The print head may comprise a modulated aperture board having a plurality of selectively controlled apertures therein and an ion generator for providing ions for electrostatic projection through the apertures. The electrostatic print head system may be used for forming latent electrostatic images and employed in an electrostatic printer which further comprises a means for developing the latent electrostatic images.

Growing community of inventors

East Sullivan, NH, United States of America

Alan H Boyer