The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 1991
Filed:
Mar. 14, 1990
Kazunori Hirose, Hiratsuka, JP;
Yukio Nishio, Tama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A developing device using a one-component developer composed of colored fine synthetic resin toner particles, which device includes a vessel for holding the developer, and a developing roller rotatably provided within the vessel, a portion of the roller being exposed and resiliently pressed against a surface of an electrostatic latent image formation drum. The toner particles are held by the surface of the developing roller to form a developer layer around the surface, and are carried to the surface of the image formation drum for development of an electrostatic latent image formed on the drum surface. The developing device further includes a toner-removing roller rotatably provided within the vessel to be in contact with the developing roller for mechanically removing the remaining toner particles not used for the development of the image from the developing roller, and a blade or roller member provided within the vessel and resiliently engaged with the developing roller, for regulating a thickness of the developer layer formed around the developing roller. The toner-removing roller is formed of a conductive porous rubber material so that pore openings appear over a surface of the toner-removing roller, the pore openings having a diameter which is at most twice an average diameter of the toner particles, whereby a penetration of the toner particles into the toner-removing roller is prevented.