Compressive stripping unit and indexing type nibbling punch for turret punch presses and the like

Claim 1

A TURRET TYPE PRESS PUNCH OR THE LIKE HAVING A PUNCH MOUNTED FOR VERTICAL MOVEMENT RELATIVE TO A WORK SURFACE, A COMPRESSIVE TYPE STRIPPING UNIT MOUNTED FOR PARTIAL MOVEMENT WITH THE PUNCH COMPRISING A SLEEVE SURROUNDING THE PUNCH HAVING A DOWNWARDLY DIRECTED SURFACE ADJACENT THE PUNCH CUTTING SURFACE AND HAVING MEANS FOR ATTACHING A SLEEVE TO THE PUNCH SO THAT THE SLEEVE MOVES PARTIALLY WITH THE PUNCH BUT IS FREE TO MOVE WITHIN DEFINED LIMITS IN VERTICAL DIRECTIONS RELATIVE TO THE PUNCH, COMPRESSION SPRING MEANS FOR CONTINUALLY URGING THE SLEEVE IN THE DIRECTION OF THE WORK SURFACE, SAID SPRING MEANS BEING MOUNTED CONCENTRIC TO ONE PORTION OF THE PRESS AND BEARING ON AN UPWARDLY DIRECTED SURFACE OF THE SLEEVE, A STRIPPER COMPRISING A FLAT METAL DISK SUPPORTED BY THE SLEEVE ON ITS DOWNWARDLY DIRECTED SURFACE BY A PLURALITY OF MAGNETS LOCATED WITHIN THE DOWNWARDLY DIRECTED SURFACE OF THE SLEEVE, SAID STRIPPER FORMING A SURFACE CONTIGUOUS TO AND IN THE SAME PLANE AS THE PUNCH CUTTING SURFACE WHEN SAID SURFACE IS NOT IN CONTACT WITH THE BLANK WHEREBY UPON POSITIONING OF THE BLANK AND LOWERING OF THE PUNCH PROXIMATE THE BLANK THE STRIPPER CONTACTS AND PRESSES THE BLANK AGAINST THE WORK SURFACE WHILE THE PUNCH PASSES THROUGH THE BLANK AND AS IT IS WITHDRAWN, AN AXIAL DIRECTED SLOT FORMED IN THE SLEEVE AND A STUB MOUNTED IN THE PUNCH AND EXTENDING THROUGH SAID SLOT, WHEREBY MOVEMENT OF THE SLEEVE INDEPENDENT OF THE PUCH IS DETERMINED BY THE LIMITS OF THE SLOT.