Developer device and contra-photography instrument
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United States of America Patent
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Aug 11, 1998
Grant Date -
N/A
app pub date -
Jul 16, 1996
filing date -
Jul 20, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
An electro-photograph device having two counter-rotating rolls (2, 5). Roll (2) transports a toner layer, controlled by a blade (4), to a printing zone (6). A voltage is applied between rolls (2, 5), in order to transfer low-adhesion toner from roll (2) to roll (5). Consequently, only toner particles having a specified minimum adhesion reach the printing zone (6). Thus, better print quality is obtained and the expenditure for drive electronics is reduced. A multitude of electrodes (18) are located on the side of a paper carrier facing away from the roll (2). A switching device (19) selectively applies the electrodes with a bias with is related to the biases applied to the rolls (2,5).
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