(19)
(11) EP 0 463 846 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.02.1992 Bulletin 1992/08

(43) Date of publication A2:
02.01.1992 Bulletin 1992/01

(21) Application number: 91305712.1

(22) Date of filing: 25.06.1991
(51) International Patent Classification (IPC)5B24B 31/033
(84) Designated Contracting States:
CH DE FR GB IT LI

(30) Priority: 26.06.1990 JP 167542/90

(71) Applicant: Ohno, Ietatsu
Shinjuku-ku, Tokyo (JP)

(72) Inventor:
  • Ohno, Ietatsu
    Shinjuku-ku, Tokyo (JP)

(74) Representative: Leale, Robin George et al
FRANK B. DEHN & CO. Imperial House 15-19 Kingsway
London WC2B 6UZ
London WC2B 6UZ (GB)


(56) References cited: : 
   
       


    (54) Grinding method and apparatus


    (57) A grinding method is provided which is capable of uniformly and precisely grinding objects in a short time, softening shocks produced when the rotation of a grinding barrel is changed between the forward direction and the backward direction to thereby eliminate bruises of the surface of grounded objects, coping with grinding for a large number of objects to be ground in a small quantity or a heavy-weight or a large-size object to be ground, and preventing contacts and collisions between objects to be ground. The grinding method comprises the steps of rotatably mounting not less than one grinding barrel (8) at locations away from the central axis (3) of a rotary drum (2), enclosing a grinding material and objects to be ground in the grinding barrels (8), rotating the grinding barrels (8) in the directions identical to and opposite to the direction in which the rotary drum (2) is rotated, and grinding the objects to be ground. A grinding apparatus for implementing the above-mentioned method is also provided.







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