(19)
(11) EP 0 329 197 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.06.1990 Bulletin 1990/24

(43) Date of publication A2:
23.08.1989 Bulletin 1989/34

(21) Application number: 89106149.1

(22) Date of filing: 30.11.1983
(51) International Patent Classification (IPC)4: G03G 15/20
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 30.11.1982 JP 209849/82

(62) Application number of the earlier application in accordance with Art. 76 EPC:
86100283.0 / 0195180

(71) Applicant: MITA INDUSTRIAL CO., LTD.
Osaka 540 (JP)

(72) Inventors:
  • Iseki, Masahide
    Neyagawa-shi Osaka-fu (JP)
  • Yoshiyama, Toshio
    Sakai-shi Osaka-fu (JP)
  • Kajita, Hiroshi
    Kobe-shi Hyogo-ken (JP)
  • Itakiyo, Masanori
    Sakai-shi Osaka-fu (JP)
  • Kusumoto, Hiroshi
    Takaishi-shi Osaka-fu (JP)
  • Kawamori, Yoshizo
    Fujiidera-shi Osaka-fu (JP)
  • Kawamoto, Masuo
    Daito-shi Osaka-fu (JP)

(74) Representative: Beetz & Partner Patentanwälte 
Steinsdorfstrasse 10
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Electrostatic copying apparatus


    (57) An electrostatic copying apparatus equipped with a heat fixing device, one of the fixing rollers being driving­ly connected to a drive source and at least one of the fixing rollers including an electrical heating element. Said apparatus comprises a starting means (600) which pro­duces a power supply closing signal when a power switch is closed, a first temperature detector (602) which detects the temperature of the fixing rollers and when the detected temperature reaches a first predetermined temperature T₁, produces a first temperature reaching signal, a second temperature detector (604) which detects the temperature of the fixing rollers and when the detected temperature reaches a second predetermined temperature T₂ suitable for fixing and higher than the first predetermined tempe­rature T₁, produces a second temperature reaching signal, a condition setting means (606) which includes a pre-­heating switch and produces either a normal condition signal or a pre-heated condition signal in response to the actu­ation of the pre-heating switch, a driving control means (610) for controlling the operation of the drive source (308), and a heating control means (608) for controlling the operation of the heating element (480).







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