Gestetner Manufacturing Limited

Joseph W Daintrey

Michael Willis

John Rushton

A copying system and apparatus wherein a first electrostatic image of an original is formed and developed on a first photoconductive surface, and second electrostatic images of the developed image are repeatedly formed on a second photoconductive surface by illumination of the first surface. The second images, which can be formed at high speed, are developed and transferred to copy material.

Copying method and apparatus

A magnetic brush monocomponent developer unit includes a doctor blade for rendering uniform the layer of toner magnetically attracted to the surface of a shell within which a rotating magnetic roller is positioned. A coil connected to the doctor blade receives an alternating magnetic field in response to rotation of the roller and the induced voltage fluctuations in that coil are sensed to determine when the voltage amplitude exceeds a given threshold value (indicative of a low amount of toner held back by the doctor blade) at which application of toner to the layer by way of a metering roller and sealing brushes is resumed.

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Walthamstow, United Kingdom

Joseph W Daintrey