Photocopying – Contact printing – Light boxes
Patent
1995-04-27
1996-05-14
Barlow, Jr., John E.
Photocopying
Contact printing
Light boxes
355219, G03G 1506
Patent
active
055172890
ABSTRACT:
An image forming apparatus having a unit for charging the surface of an image carrier uniformly with electricity, the charging unit being contacted by a conductive element which changes a polarity of toner adhering to the unit, a unit for forming an electrostatic latent image on the surface of the image carrier charged electrically, a unit for developing the electrostatic latent image formed on the surface of the image carrier to thereby form a toner image and a means for transferring and fixing the toner image to a transfer member. The developing unit includes a developing roller which is disposed so as to contact the image carrier. The developing roller is connected to a power source for charging the toner particles on the developing roller with electricity with the same polarity as the charging polarity of the the image carrier, and for applying an electric potential to the developing roller so that the toner particles remaining on the developing roller are stuck to an image portion of the image carrier and the toner particles remaining on a non-image portion of the image carrier are attracted by the developing roller. The developing roller rotates in the direction opposite to that of the image carrier and a peripheral velocity of the developing roller exceeds 1.2 times that of the image carrier. Since the collected toner particles are not necessary to be disposed of, the environment is not polluted and the efficiency of using the toner is improved.
REFERENCES:
patent: 4185910 (1980-01-01), Nomura et al.
patent: 4201465 (1980-05-01), Oyama et al.
patent: 4571066 (1986-02-01), Morrison
patent: 4769676 (1988-09-01), Hideo et al.
patent: 4967231 (1990-10-01), Hosoya et al.
patent: 5221946 (1993-06-01), Kohyama et al.
Patent Abstracts of Japan, vol. 10, No. 198 (P-476)(2254), Jul. 11, 1986, and JP-A-61-042 669 (Abstract).
Ishihara Toru
Ito Katsuyuki
Murano Toshiro
Sakai Masato
Barlow Jr. John E.
OKI Electric Industry Co., Ltd.
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