(19)
(11) EP 0 555 604 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.12.1993 Bulletin 1993/51

(43) Date of publication A2:
18.08.1993 Bulletin 1993/33

(21) Application number: 92403431.7

(22) Date of filing: 16.12.1992
(51) International Patent Classification (IPC)5: B21D 28/12
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 16.12.1991 US 807586
21.02.1992 US 838867

(60) Divisional application:
95114957.4 / 0694347

(71) Applicants:
  • AMADA COMPANY LIMITED
    Kanagawa 259-11 (JP)
  • AMADA MFG AMERICA INC.
    La Mirada, California 90638 (US)

(72) Inventor:
  • Hayashi, Tetsuji
    La Mirada, CA 90638 (US)

(74) Representative: Hasenrader, Hubert et al
Cabinet Beau de Loménie 158, rue de l'Université
F-75340 Paris Cédex 07
F-75340 Paris Cédex 07 (FR)


(56) References cited: : 
   
       


    (54) Turret punch press


    (57) A turret punch press (1) wherein the upper and lower turrets (21,27) are rotated, and the upper die (17,19) positioned in the processing position is struck by a piston rod (13) (striker element) of a striker device (15) mounted on the lower end of a ram (11) when the ram is lowered by means of a crank shaft (10) (mechanical vertically moving means). The piston rod can be freely moved vertically by a hydraulic cylinder (65) so that the amount of the stroke of the striker element with respect to the upper die is the sum of the amount of the stroke of the ram and the amount of the stroke of the piston rod in the hydraulic cylinder itself. Accordingly, the upper die and the lower die (23,25) come into contact and the processing occurs only when the ram and the piston rod are both at bottom dead center.






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