(19)
(11) EP 1 101 580 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.12.2002 Bulletin 2002/50

(43) Date of publication A2:
23.05.2001 Bulletin 2001/21

(21) Application number: 00125144.6

(22) Date of filing: 17.11.2000
(51) International Patent Classification (IPC)7: B26F 1/02, B26F 1/24, B26D 5/00, B26D 5/16, B44B 5/00, B44B 3/00, B26D 5/12
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 17.11.1999 JP 32712699

(71) Applicant: Ando Electric Co., Ltd.
Kawasaki-shi, Kanagawa (JP)

(72) Inventors:
  • Yano, Tetsuo, Ando Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)
  • Kudoh, Tetsuya, Ando Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)
  • Ohta, Yasunori, Ando Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Punching apparatus and punching method


(57) In a stamping apparatus, a subtracter 22b and an adder 23b compare an output value of an amplifier 29 which is a signal proportional to [T] expressing the torque generated at a fulcrum 101 by the reaction force [F] from the material to be stamped 6, to a pulse · duty setting value stored in a pulse · duty setting section 21b, and a signal in which the difference is added to the pulse · duty setting value, is generated, and a switch 25 inputs the signal into a comparator 24b in order to make the signal the comparison signal to the chopping wave outputted from a chopping wave generation circuit 26' in the PWM pulse generation circuit 26.






Search report