| 主权项 |
1. A punching device for cutting a workpiece to form a cutout portion, comprising:
a base including a die part and a support part that is disposed above and that cooperates with said die part to define an accommodating space for receiving the workpiece therein; an upper housing having a top wall and a surrounding wall that extends downwardly from said top wall and that is formed with a lever opening, said surrounding wall having a lower end that is secured to said support part, and cooperating with said top wall and said support part to define a housing space therebetween; a punch of a single piece disposed in said housing space, supported movably on said support part, movable relative to said die part between upper and lower positions, and having a head wall, a driven protrusion, and outer and inner blades, said head wall having top and bottom surfaces and being formed with a plurality of through-holes that extend through said top and bottom surfaces, said driven protrusion protruding upwardly from said top surface of said head wall, said outer and inner blades extending downwardly from said bottom surface to slide against said die part for cutting the workpiece, and cooperatively defining a gap therebetween; an ejecting unit disposed in said housing space and including a non-compressible ejecting element, a plurality of connecting rods, a horizontal plate, and a first vertical plate, said ejecting element being disposed in said gap below said head wall, said connecting rods extending upwardly from said ejecting element and respectively passing through said through-holes in said head wall to integrally connect with said horizontal plate, said horizontal plate being disposed on said head wall and being formed with an aperture, said driven protrusion extending through said aperture so as to permit said horizontal plate to be slidably sleeved on said driven protrusion, said first vertical plate extending upwardly from said horizontal plate; an operating lever having a pivot end, an operating free end opposite to said pivot end, and a driving tongue, said pivot end being pivoted to said support part, said operating lever extending through said lever opening in said surrounding wall, such that said operating free end is disposed outwardly of said housing space, said driving tongue being disposed between said pivot end and said operating free end, and protruding therefrom into said housing space to abut against said driven protrusion so as to drive movement of said punch from said upper position to said lower position when said operating lever rotates downwardly relative to said support part; and at least one spring urging said punch for restoring said punch from said lower position to said upper position; wherein, when said punch is disposed at the upper position, said first vertical plate abuts against said top wall of said upper housing, said horizontal plate is seated on said top surface of said head wall, and said ejecting element is spaced apart from said die part; and wherein, when said punch is disposed at the lower position, said first vertical plate is spaced apart from said top wall of said upper housing, said horizontal plate is spaced apart from said head wall, and said ejecting element is seated on said die part. |
