Registration and transfer locking unit for a steel rule die and accommodating counter plate

In a combination die and an accommodating counterplate assembly for scoring and cutting sheet material located therebetween, means for securing said die over said counterplate in an opposed face-to-face manner and in a precise aligned relationship for transfer to a press where said scoring and cutting of sheet material can occur, the improvement wherein said die and counterplate securing means includes a bushing having a longitudinal bore and a guide pin adapted to fit snuggly into said bushing longitudinal bore, an opening formed in one of said die and counterplate, said bushing fitted into said opening and secured to said one of the die and counterplate, said bushing including an end portion extending beyond the opposing face of said one of the die and counterplate, said bushing end portion having a transverse bore therethrough intersecting its longitudinal bore, said guide pin secured to the other of said die and counterplate, said guide pin protruding from the opposing face of said other of the die and counterplate and having a side wall with a groove therein said guide pin fitting into said bushing longitudinal bore when said die and counterplate are in their aligned relationship with said guide pin groove registering with said bushing transverse bore, a removable lock pin means fitable into said registering guide pin groove and bushing transverse bore for securing said guide pin within said bushing, said guide pin groove having a width exceeding the transverse dimension of said lock pin means to permit limited relative longitudinal movement of the guide pin within the bushing to allow aligned movement of the die relative to the counterplate.