Patent ID: 7428837

Claim:
An operation control method for a tandem press line in which a work transportation device is disposed between a press apparatus on an upstream side and a press apparatus on a downstream side which are adjacent to each other, the method comprising: controlling operation of the press apparatus on the downstream side based on a signal in accordance with operation of the press apparatus on the upstream side; controlling operation of the work transportation device in a work carrying-out section in a vicinity of the press apparatus on the upstream side based on a signal according to the operation of the press apparatus on the upstream side; controlling operation of the work transportation device in a work carrying-in section in a vicinity of the press apparatus on the downstream side based on a signal according to the operation of the press apparatus on the downstream side; controlling operation of the work transportation device in a work transporting section between the work carrying-out section and the work carrying-in section based on a signal generated by an oscillator of the work transportation device; and controlling the signal generated by the oscillator so as to gradually decrease a deviation between the signal generated by the oscillator and the signal according to the operation of the press apparatus on the downstream side.