Am International Incorporated

Savin Corporation

Robert M Simms

George A Gibson

David D Dreyfuss

Jian Wen

The present invention resides in a method for transferring images from an image-bearing surface, to a moving web or sheet. The image-bearing surface is advanced in a predetermined direction, and the receptor area of the image-bearing surface is exposed to successive images. The successive images are developed using a liquid toner comprising charged pigmented particles, in a liquid hydrocarbon carrier. A porous web is transported in synchronism with movement of said image-bearing surface into position for transfer of said developed images on said receptor area successively onto said web. In one embodiment, the web is an uncoated, non-conductive porous material. The web is treated with a fluorinated or partially fluorinated hydrocarbon surfactant hold-out material in an amount effective to reduce the penetration rate of the toner carrier into the web so as to ensure that sufficient carrier is available for complete and void-free transfer. In another embodiment, the same treatment is effective to prevent the leaching of materials from coatings such as those used in the manufacture of carbonless papers.

Treatment to enhance transfer in liquid toner electrophotography

A copier wherein charge director is supplied to a liquid developer in response to a conductivity measurement thereof. Toner concentrate deficient in charge director is supplied to the liquid developer in response to an optical transmissivity measurement thereof. Conductivity is measured by a pair of spaced electrodes immersed in the developer and through which a variable alternating current is passed. A variable capacitor neutralizes the inherent capacitance of the electrodes. A phase sensitive detector is provided with a reference voltage having the same phase shift as that caused by capacitive effects. The conductivity measurement is corrected in response to a developer temperature measurement.

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Beavercreek, OH, United States of America

Robert M Simms