Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1994-12-15
1999-03-16
Le, N.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
347159, B41J 239, B41J 2295, B41J 240, B41J 2385
Patent
active
058836560
ABSTRACT:
A method and apparatus are provided for "field effect imaging" of moving substrates, such as webs of paper. Non-conductive, nonmagnetic toner having approximately a 5-20 micron mean particle size is electrically charged to a level of at least about 8 micro Coulombs/gram and then a first roller with a conductive surface is brought into operative association with the electrically charged toner so that toner particles adhere to the surface. The toner particles are preferably maintained in an electrostatic fluidized bed, and charged by a corona element in the bed. An array of pin or stylus primary electrodes are selectively energized or de-energized to provide no-write or write condition, respectively using a computer to switch the electrodes into or out of operative connection to a source of electrical potential. The toner particles are transferred from the first roller to a substrate either directly (after passing past the primary electrodes), or they are first transferred to a second roller which then brings the toner particles into contact with the substrate. If a second roller is utilized, the primary electrodes can be in association with the first roller, or between the first and second rollers for transferring only "write" toner to the second roller.
REFERENCES:
patent: 3816840 (1974-06-01), Kotz
patent: 4402000 (1983-08-01), Fabel et al.
patent: 4464672 (1984-08-01), Lindahl
patent: 4544935 (1985-10-01), Sakai
patent: 4620203 (1986-10-01), Nakatani
patent: 4729310 (1988-03-01), Love, III
patent: 4763143 (1988-08-01), Ohba et al.
patent: 4777499 (1988-10-01), Okuna et al.
patent: 4810604 (1989-03-01), Schmidlin
patent: 4855763 (1989-08-01), Kan et al.
patent: 4855768 (1989-08-01), Iino et al.
patent: 4860036 (1989-08-01), Schmidlin
patent: 4876561 (1989-10-01), Schmidlin
patent: 4903050 (1990-02-01), Schmidlin
patent: 4949103 (1990-08-01), Schmidlin
patent: 4977415 (1990-12-01), Oba et al.
patent: 5115759 (1992-05-01), Kagayama
patent: 5132708 (1992-07-01), Schmidlin
patent: 5187523 (1993-02-01), Osawa
patent: 5231427 (1993-07-01), Ohashi
patent: 5253022 (1993-10-01), Takeuchi et al.
patent: 5257046 (1993-10-01), Schmidlin
patent: 5291254 (1994-03-01), Shimada et al.
patent: 5406314 (1995-04-01), Kuehnle
patent: 5422214 (1995-06-01), Akiyama et al.
Gordon Raquel Yvette
Le N.
Moore Business Forms Inc.
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