(19)
(11) EP 1 387 221 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
10.11.2004 Bulletin 2004/46

(43) Date of publication:
04.02.2004 Bulletin 2004/06

(21) Application number: 03016582.3

(22) Date of filing: 25.07.2003
(51) International Patent Classification (IPC)7G03G 15/00
(84) Designated Contracting States:
DE ES FR GB IT NL

(30) Priority: 29.07.2002 JP 2002220497

(71) Applicant: Ricoh Company, Ltd.
Tokyo 143-8555 (JP)

(72) Inventors:
  • Takuroh Kamiya
    Tokyo 143-8555 (JP)
  • Junya Takigawa
    Tokyo 143-8555 (JP)
  • Yoshihiro Sakai
    Tokyo 143-8555 (JP)
  • Katsuya Kawagoe
    Tokyo 143-8555 (JP)
  • Ryuuichi Mimbu
    Tokyo 143-8555 (JP)
  • Toshiyuki Andoh
    Tokyo 143-8555 (JP)
  • Koichi Kudo
    Tokyo 143-8555 (JP)

(74) Representative: Schwabe - Sandmair - Marx 
Stuntzstrasse 16
81677 München
81677 München (DE)

   


(54) Image forming apparatus including speed detection mechanism for a rotary member


(57) An image forming apparatus including a rotary member (10) having an image formation area, and a scale (70) located at a position outside of the image formation area and on an inner circumference of the rotary member (10). Also included is a drive device (80) configured to drive the rotary member (10), a developing device configured to develop an image on the image formation area of the rotary member, and a transfer device (22) configured to transfer the image on the image formation area to a recording sheet. Further included is a sensor (71) configured to detect the scale (70) on the rotary member (10) and to output a signal corresponding to the detection of the scale (70).