Punch press tool for punching small holes in a strip of sheet metal, and obtaining small punched blanks

Punch press tool for punching small disk elements or blanks (11) from sheet material (6) having

• a punch die (4) being formed with a continuous receiving and removal opening (5) for the disk elements or blanks;
• and a punch press element (1) having an outer shape and diameter fitting into the opening (5) of the die, reciprocatingly operable to enter into the opening for entirely severing a disk element or blank (11) from the sheet material, and remove the disk element or blank from the punch die, the punch press element withdrawing from the punch die after having entered the punch die;
• wherein, in accordance with the invention
• the wall of the opening (5) of the punch die is formed with at least one shallow groove (8) having a dimension small with respect to the surface area of the disk elements or blanks extending in the direction of the severing movement of the punch press element (1) and for a length which is at least as long as the depth of penetration of the punch press element into the opening of the punch die;
• and
• wherein the punch press element has an outer shape which corresponds to the surface configuration of the disk element or blank and spans, but does not enter said shallow groove (8),
• whereby, upon entering of the punch press element into the die, the punch press element will punch out a disk element or blank from the sheet material in the shape of the punch press, the disk element or blank being formed with a small projection extending into the groove, said small projection frictionally engaging in the groove and thus inhibiting undesired following, or adhesion of the disk element or blank to the punch element upon withdrawal operation of the punch element from said opening.