| 摘要 |
A press including a frame which carries a pair of tool-holding beams lying in a common general plane. One of the beams carry a punch and the other a bending die. At least one of the beams is movable towards the opposing beam to perform a working stroke, and in the opposite direction. According to the invention, the movable beam is divided, at least effectively, into a number n of sections, n being equal to or greater than 2. The devices for moving the beam are constituted by n=1 servomotor units each of which is provided with a support coupled to the movable beam and is adapted to exert a force, through this support, for thrusting the movable beam towards the opposite beam during the working stroke. Two servomotor units are end units whose supports are coupled to respective ends of the movable beam. The other remaining servomotor is an intermediate unit whose support is situated in the transition zone between one section and another. If P is the total force thrusting the movable beam towards the opposing beam, each end unit is adapted to exert a thrust force of P/2(n-1) on the movable beam through its support. A position transducer is associated with each support and the servomotor units are subject to a common control processor having inputs connected to the transducers and outputs connected to the servomotor units. The processor is adapted to control each unit so that all the units impart identical movements and speeds of movement of their supports and to the movable beam. |
