Delphax Systems

Brian F Whittaker

Andrzej Maczuszenko

Dolf Landheer

Brian Otter

Ernest Davison

Christopher Novak

John C Stirrat

Kenneth L Hurley

This invention provides an electrostatic printing apparatus comprising a rotatable electrostatically chargeable drum and ion deposition means for forming an electrostatic image on the electrostatically chargeable drum, the improvement comprising means for discharging a flow of air along the path of flow extending between the periphery of the electrostatically chargeable drum and the ion discharge means.

Electrostatic printing apparatus and method

A toner feeder is provided for use with a magnetic roller to tone electrostatic images. The feeder includes a doctor blade attached to an adjustable block for varying the gap between an edge of the blade and the magnetic roller. The block and blade combine to define a recess above the blade and toner builds up in the recess to present a living wall of toner. This reduces agglomeration and build up of toner lumps. The invention is particularly useful with toners requiring relatively low fusing pressures.

Toner feeder system

Apparatus is provided for printing on a receptor such as paper. An electrostatic image is formed on a dielectric-coated drum in a controlled environment to minimize the creation of chemical contaminants. The image is then toned by wiping toner over the image from a toner delivery system which includes a mouth shaped to cause a vortex in the toner to improve toner flow. After toning the image is transferred to the receptor under pressure from a roller which is skewed with reference to the drum. The pressure in the nip is sufficient to also cause the toner to be fused to the receptor. An image eraser is also provided in the controlled environment.

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Toronto, Canada

Brian F Whittaker