| 摘要 |
A punch (1) includes first and second blade sections (4, 5) juxtaposed relative to each other in a direction parallel to a feed direction (A) of a sheet material. The first blade section (4) protrudes downwardly from the second blade section (5) with a step intervening therebetween and has lower end edges on downstream and upstream sides of the feed direction (A), which define respective punching edges (4a, 4b). The first blade section (4) has a lower end edge following the feed direction (A), which defines a first notching and punching edge (4c). The notching and punching edge (4c) has a portion intermediate of the feed direction (A) representing a projecting shape. The second blade section (5) has a lower end edge on the upstream side, which defines a punching edge (5a) and also has a lower end edge following the feed direction (A), which defines a notching and punching edge (5c). The notching and punching edge (5c) is of a shape inclined gradually upwardly towards the upstream side. |
