PUNCH APPARATUS Russian patent published in 2017 - IPC B21D28/34 B26D5/12 B26F1/14 

FIELD: construction.

SUBSTANCE: device contains a drive unit (18) and a driving force transmitting mechanism (20) to a rod (16). In a cam unit (34) of the mechanism (20), connected to a piston rod (68) there is a cam groove (102). A roller (104) is inserted into the groove and it is free to rotate on a moving element (100), connected to the rod (16). The cam groove (102) has a first section (112) and a second section (114), located at the predetermined angles of inclination to the cam unit (34) movement direction. When the rod (16) is lowered in the direction of the processing part (W), the roller (104) is moved from the second groove section (114) to the first section (112), having a smaller inclination angle. This increases the driving force, transmitted to the rod (16).

EFFECT: increase of expansion of the output force range.

8 cl, 6 dwg