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:
May. 15, 1990
Filed:
Jan. 19, 1988
Hiroshi Mizuno, Osaka, JP;
Hiroshi Murasaki, Osaka, JP;
Akihito Ikegawa, Osaka, JP;
Kouichi Etou, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A developing apparatus is disposed adjacent to an electrostatic latent image support member in an image forming apparatus, and includes a rotatable developing sleeve confronting the electrostatic latent image support member, a magnetic roller disposed inside the developing sleeve for holding magnetic carrier on a peripheral surface of the developing sleeve, and a plurality of toner supply units confronting the developing sleeve for supplying toner to the developing sleeve. The magnetic roller accommodates a plurality of magnetic poles extending in a direction of its axis. Each toner supply unit is provided with a toner supply roller rotatable in contact with a magnetic brush held on the developing sleeve and a toner storing portion for storing the toner. A control device and an operation panel is also provided for selectively rotating either of the toner supply rollers by means of a driving source, for selecting the toner stored in any of the toner supply units, and for controlling the movement of the toner supply roller.