Piercing apparatus

Details Piercing apparatus Piercing apparatus

1999-04-06

2000-09-19

Rachuba, M.

Cutting

Cutting motion of tool has component in direction of moving...

Orbital motion of cutting blade

83675, B23D 500

Patent

active

061195685

ABSTRACT:
In order to achieve speed up of the piercing operation to form elongated forms in a thin sheet whose length is greater than the thickness and width thereof, a piercing apparatus is provided with an upper roller die having a first cutter roller held between press rollers so that the first cutter roller protrudes at the outer peripheral portion thereof, from the outer peripheral surfaces of the press rollers, a lower roller die having recesses between two second cutter rollers and engaging with the outer peripheral portion of the first cutter roller. The thin sheet is continuously fed in the lengthwise direction thereof into the engagement portion between the upper and lower dies. When a sliding cutter is engaged in the recesses formed on the first cutter roller, the thin sheet passing through the engagement portion is cut to form elongated holes.

REFERENCES:
patent: 845764 (1907-03-01), Curtis
patent: 1301332 (1919-04-01), Spiegel

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