(19)
(11) EP 0 387 989 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.01.1991 Bulletin 1991/05

(43) Date of publication A2:
19.09.1990 Bulletin 1990/38

(21) Application number: 90301120.3

(22) Date of filing: 02.02.1990
(51) International Patent Classification (IPC)5: B24B 41/04
(84) Designated Contracting States:
DE FR

(30) Priority: 13.03.1989 JP 60307/89

(71) Applicant: SEIKO SEIKI KABUSHIKI KAISHA
Narashino-shi Chiba (JP)

(72) Inventor:
  • Oshima, Jinichiro, c/o SEIKO SEIKI K. K.
    Narashino-shi Chiba (JP)

(74) Representative: Miller, Joseph et al
J. MILLER & CO. 34 Bedford Row, Holborn
London WC1R 4JH
London WC1R 4JH (GB)


(56) References cited: : 
   
       


    (54) Grinding machine


    (57) A grinding machine comprising first mounting means (30) for mounting a workpiece (W) which is to be ground; second mounting means (3) for mounting a grinding member (21) to effect grinding of the workpiece (W); drive means (8) for effecting relative rotation of the first and second mounting means (30,3); and tilting means (23-29) for effecting relative tilting of the first and second mounting means (30,3) so that the workpiece (W) can be accurately ground to predetermined dimensions characterised in that at least one of said first and second mounting means (30,3) is constituted by a shaft (3) which is mounted within a housing (1), the housing (1) having electromagnets (5,6) which are arranged to produce a magnetic force which is effective to float and radially support the shaft (3); the said tilting means (23-29) electrically controlling the electromagnets (5,6) so that the magnetic force produced by the latter can be adjusted to tilt the shaft (3) with respect to the housing (1).







    Search report