| 摘要 |
The invention relates to a punching machine, comprising a die holder (86) for an exchangeable die (88), a supporting face (84) for sheet-type material (82) to be worked, and a punch holder (28), for an exchangeable punch (26) interacting with the die (88), the punch holder (28) to be driven at right angles thereto under the influence of a first control device (68, 74), further comprising: a second control device (146, 148) for adjusting the die holder (86) in height relative to the supporting face (84); a first measuring device (120, 126, 102; 120, 126, 104; 166) for producing a first data signal representing the height of the die (88) to be used; a second measuring device (120, 126, 100; 166) for producing a second data signal representing the height of the punch (26) to be used; a device (170) for producing a third data signal representing the thickness of the material to be worked; a data processing device (160) to which the three data signals are fed and which in response thereto: produces a first control signal to be fed to a first control device for controlling the punch holder (28) in such a way that at the end of the operating stroke thereof the end of the punch (26) lies at a predetermined distance below the top surface of the material (82) to be worked, and produces a second control signal to be fed to the second control device for taking the top surface of the die (88) into a predetermined height setting relative to the supporting face (84) prior to the operating stroke of the punch (26). Advantageously, the punch holder control device takes the punch holder (28) into a predetermined initial position relative to the supporting face (84), which position is independent of the actual punch height, and controls the length of the operating stroke of the punch holder depending on the actual punch height. The punch holder control device preferably takes the punch holder (28) into a predetermined initial position relative to the top surface of the material (82) to be worked, which position is independent of the actual punch height, and controls the length of the operating stroke of the punch holder depending on the actual punch height. The first and second measuring devices may be formed by respective steps (100, 102, 104) of a step-shaped element, and a measuring face which is movable above and at right angles to the steps and is coupled to a displacement sensor (126).
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