a punching device comprising a pair of opposed complementary dies vertically guided by a pair of guide rods each rotatably connected to a crank pin to continuously punch band material moving between the dies . the crank pins rotate synchronously in opposed directions with their crank centers spaced only vertically relative to the working plane . each of the dies supports a plurality of cooperating tools and the tools in one of the dies are independently axially movable male punches sealingly guided in ducts communicating with a closed chamber filled with a fluid .