HOLE PUNCHING UNIT

摘要

The invention relates to a stamping assembly having a U-shaped main part (1), the outer part of one arm (1a) of which is provided with a recess operative to support a die (3), and the outer part of the other arm (1b) of which is provided with a hole or bore operative to guide a punch holder (5') with associated punch (6), wherein an upper plate (7) on the punch holder (5) is intended to hold the punch holder (5) spaced from the die with the aid of a spring device, such as to enable a workpiece to be inserted in a space (10) defined between the punch and the die. The spring device (8) is enclosed in a hollow-cylindrical plastic element (11). The internal dimensions of the hollow-cylindrical element (11) coincide, or at least substantially coincide with the outer dimensions of the cup springs (8). The material from which the hollow-cylindrical element (11) is made has spring characteristics. The element (11) forms a shield around the cup washers and may function as a complementary spring means.