(19)
(11) EP 0 385 674 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.09.1991 Bulletin 1991/36

(43) Date of publication A2:
05.09.1990 Bulletin 1990/36

(21) Application number: 90301970.1

(22) Date of filing: 23.02.1990
(51) International Patent Classification (IPC)5: G03G 15/16
(84) Designated Contracting States:
DE FR GB

(30) Priority: 25.02.1989 JP 44367/89
25.02.1989 JP 44368/89
25.02.1989 JP 44369/89

(71) Applicant: FUJITSU LIMITED
Kawasaki-shi, Kanagawa 211 (JP)

(72) Inventors:
  • Kimura, Masatoshi
    Ebina-shi, Kanagawa 243-04 (JP)
  • Iwasaki, Hideaki
    Kawasaki-shi, Kanagawa 214 (JP)
  • Sasaki, Sachio
    Yokohama-shi, Kanagawa 227 (JP)
  • Sato, Kunihiko
    Zama-shi, Kanagawa 228 (JP)
  • Konishi, Masao
    Hachioji-shi, Tokyo 192 (JP)
  • Iwamasa, Akiyoshi
    Ebina-shi, Kanagawa 243 (JP)
  • Tooda, Toshio
    Takatu-ku, Kawasaki-shi, Kanagawa 213 (JP)
  • Nou, Hiroshi
    Yokohama-shi, Kanagawa 227 (JP)
  • Utaka, Shigenobu
    Kawasaki-shi, Kanagawa 211 (JP)
  • Kitao, Ryo
    Yokohama-shi, Kanagawa 241 (JP)

(74) Representative: Skone James, Robert Edmund et al
GILL JENNINGS & EVERY Broadgate House 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)


(56) References cited: : 
   
       


    (54) Toner image transferring device used in electrophotographic field


    (57) A toner image transferring device is applied to, for example, an electrophotographic printer for electrostatically transferring a charged toner image from a photosensitive drum (10) to a sheet or paper (P), and comprises a transfer charger (16) disposed near the drum (10) to form a clearance therebetween for feeding an electric charge to the sheet or paper through which the sheet or paper is passed, an electric source (38) for supplying an electric energy to the transfer charger to give the sheet or paper an electric charge having a polarity opposite to that of the toner image, and a controller (40) for controlling the electric energy output from the electric source (38) to the transfer charger (11) so that a leading edge of the sheet or paper can be prevented from being excessively charged.







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