| 摘要 |
To permit high-speed punching of complex shapes in extremely thin metal strips or ribbons, particularly for miniaturized semiconductor terminal elements, while using standardizing modular punch press components sush as a die, a stripper element and a punch carrier, with minimum longitudinal extent to suppress oscillations of the ribbon as it is being transported, at high punching frequencies, the stripper plate (2) is securely connected to a plurality of guide posts (6). Springs (18, 16) are provided which maintain the posts and the stripper plate in a base position, and lift the stripper plate above a die plate (1). These springs retain the posts, are circumferential spring rings (16) engaging a groove (17) in the posts and fitted in the die plate, or ball-and-detent arrangements (FIG. 9) coupling the die element (1) to the posts, while permitting yielding resilient relative movement between the die and the posts upon compression of the posts against the die during the punching stroke when the stripper element is engaged with the top surface of the workpiece strip (13). Workpiece guide pins (9) laterally guide the workpiece through the apparatus; the guide pins are spring-loaded to lift the workpiece off the die plate after a punching stroke to permit indexing or longitudinal movement of the workpiece.
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