EP 0448039 A3 19921202 - IMAGE FORMING APPARATUS
Title (en)
IMAGE FORMING APPARATUS
Publication
Application
Priority
JP 6876590 A 19900319
Abstract (en)
[origin: EP0448039A2] An image forming apparatus comprises a photoreceptor (1); plural developer units (2, 3) for giving toner alternatively to the photoreceptor (1) to develop a latent image formed on the photoreceptor (1); toner density sensors (35, 37) for detecting the toner density of the developer units (2, 3); toner supplier for supplying toner to the developer units (2, 3) according to the output of the toner density sensor (35, 37); detector (35, 47) for detecting whether said developer units (2, 3) are attached with respect to the periphery of the photoreceptor (1); and controller (40) for so controlling the image forming operation as to be performed only when a predetermined plural number of developer units (2, 3) are attached. According to the image forming apparatus, it is possible to correct the output of the toner density sensor (35). <IMAGE>
IPC 1-7
IPC 8 full level
G03G 15/01 (2006.01); G03G 15/08 (2006.01); G03G 21/00 (2006.01)
CPC (source: EP)
G03G 15/0126 (2013.01); G03G 15/0849 (2013.01); G03G 15/0896 (2013.01)
Citation (search report)
- [Y] US 4885611 A 19891205 - HIGASHIO KIMIHIKO [JP], et al
- [Y] FR 2596536 A1 19871002 - TOSHIBA KK [JP]
- [A] US 4897690 A 19900130 - TAKANO YOSHIAKI [JP]
- [A] EP 0357432 A2 19900307 - MITA INDUSTRIAL CO LTD [JP]
- [A] IBM TECHNICAL DISCLOSURE BULLETIN. vol. 17, no. 4, September 1974, NEW YORK US page 1096 G.T.WILLIAMS 'toner control interlocks'
- [A] PATENT ABSTRACTS OF JAPAN vol. 13, no. 464 (P-947)20 October 1989 & JP-A-01 180 569 ( MINOLTA CAMERA )
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0448039 A2 19910925; EP 0448039 A3 19921202; EP 0448039 B1 19951115; DE 69114556 D1 19951221; DE 69114556 T2 19960411; JP H03267968 A 19911128
DOCDB simple family (application)
EP 91104237 A 19910319; DE 69114556 T 19910319; JP 6876590 A 19900319