DEVICE FOR PUNCHING HOLES Russian patent published in 2019 - IPC B21D28/20 B30B1/14 B30B1/40 

FIELD: construction.

SUBSTANCE: invention relates to a device for punching holes. Device comprises housing, drive unit connected to upper part of housing, and cam unit, which under action of driving force drive unit movement in horizontal direction inside housing. Second cam roller connected to rods is fitted in cam second cam groove. Second cam groove includes first and second groove sections arranged at preset angles of inclination relative to direction of cam block displacement such that when rod is lowered in direction of processed part, second rotary roller moves from second section of groove to first section of groove, having smaller inclination angle, due to which there is an increase in the driving force transmitted to the rod.

EFFECT: reduced size at simultaneous increase of output force.

1 cl, 4 dwg