(19)
(11) EP 0 427 277 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.08.1991 Bulletin 1991/33

(43) Date of publication A2:
15.05.1991 Bulletin 1991/20

(21) Application number: 90121430.4

(22) Date of filing: 08.11.1990
(51) International Patent Classification (IPC)5: B42C 19/02, G03G 15/00, B42C 1/12
(84) Designated Contracting States:
DE GB

(30) Priority: 09.11.1989 JP 290107/89
09.11.1989 JP 290108/89

(60) Divisional application:
95103678.9 / 0665122

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventors:
  • Nakamura, Shinichi
    Ohta-ku, Tokyo (JP)
  • Nakayama, Tomobumi
    Ohta-ku, Tokyo (JP)
  • Iwamoto, Osamu
    Ohta-ku, Tokyo (JP)
  • Kuroyanagi, Satoshi
    Ohta-ku, Tokyo (JP)
  • Tahara, Hisatsugu
    Ohta-ku, Tokyo (JP)

(74) Representative: Pellmann, Hans-Bernd, Dipl.-Ing. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4
80336 München
80336 München (DE)


(56) References cited: : 
   
       


    (54) Image forming apparatus with book binding mechanism


    (57) An image forming apparatus has a book binding mechanism for performing a book bind operation using front sheets of a plurality of sizes which can bind a bundle of sheet members recorded by said image forming apparatus, and have limitations on the numbers of recorded sheet members to be bound. The image forming apparatus further has output means for outputting sheet number data according to a bundle of sheet members; judge means for judging whether or not the sheet number data output from said output means is larger than a range of the limitation; detect means for, when the judged result from said judge means is affirmative, dividing the sheet number data, and detecting a divided sheet number value which falls within the range of the limitation; and control means for controlling to perform a book bind operation in units of the sheet numbers detected by said detect means.







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