| 摘要 |
The invention concerns a safety device on metal-forming machine tools, in particular on pneumatic pressing machines, used in the execution of shortstroke pressing processes, for preventing intervention in the danger zone during the tool working movement and unintentional closure movements. The machine essentially comprises a machine housing, a power-generating system, a control system and a tool arrangement with a fixed part and a movable part, and the actual metal-forming tool connected thereto. The object of the invention is the highly reliable prevention of injuries owing to inattentiveness in spite of hands' being left in the immediate danger zone. To that end, the safety device (8) consists of a lever-like part (9) which is disposed between a guide part (15) and a counter bearing (14), is connected both to the power-generating system (2) and to the movable part (4) of the tool (3), slides along the guide part (15) and co-operates with the counter bearing (14) such that each working stroke of the movable part (4) occurs in two stages, first as a stroke for moving into a predetermined position (20) and then as a power stroke for carrying out the forming process, which occurs only when there is no obstacle (25) in the space between the movable part (4) and the workpiece.
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