Patent ID: 8863626
Filing Date: 2014-10-21
Classification: B21D,B23D,Y10T

Abstract:
1. A nibbler assembly for a punch press, the nibbler assembly being operable to punch in a sheet material successive holes that at least partially overlap with each other along a feed direction in which the sheet material is fed from an upstream to a downstream in the feed direction so as to form an elongated hole in the sheet material, the nibbler assembly comprising: a die including a through opening formed therein, the through opening having an oblong configuration as viewed along a vertical direction, the die including an upper surface including a recess extending from an upper peripheral portion of the through opening at an upstream side of the feed direction towards the upstream of the feed direction, the recess being dented downwardly relative to other portions of the upper surface and defining an upper peripheral portion of the through opening at the upstream side of the feed direction, the upper peripheral portion of the through opening at the upstream side of the feed direction being lower than an upper peripheral portion of the through opening at a downstream side of the feed direction; and a punch including a blade substantially matching in shape with the through opening and configured to enter the through opening, the blade including an upstream end portion in the feed direction provided with opposite corners each having an arcuate shape as viewed along the vertical direction, the upstream end portion in the feed direction cooperating with the upper peripheral portion of the die to punch an upstream portion of the sheet material.