| 摘要 |
Apparatus for making shaped bores in a metal strip, comprising a base and a vertically alternating press, said strip being blockable therebetween. The base carries a cutting profile bar and the press carries a blade, the lower edge of which is tooth-shaped with a rather substantial thickness. During press downward movement, the blade cooperating with said bar, first shears off a series of separate aligned cuts in the strip and then the bar is moved away from the blade which, continuing its downward movement will deform by its teeth and stretch out the strip at said cuts. As the press along with the blade moves upwards, said bar moves back to operative position and urges the metal strip forward by one step.
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