Patent ID: 8790108

Claim:
A press plate actuating system of thermoforming presses provided with a movable lower plate ( 6 , 60 ), an upper plate ( 7 ) and a mold facing the upper plate ( 7 ), for molding a sheet of thermoplastic material (F) pressed between said plates, said press plate actuating system comprising: two eccentric axles ( 1 and 2 ; or 10 and 20 ) driven in an independently and alternately way, the first eccentric axle ( 2 , 20 ) having a long course for lifting and lowering the lower plate ( 6 , 60 ) between a lower position and a higher position or towards the upper plate ( 7 ); and the second eccentric axle ( 1 , 10 ) having a short course movement and a great impact force of the lower plate ( 6 , 60 ) against the upper plate ( 7 ) wherein the plate ( 60 ) is moved vertically by a connecting rod ( 40 ), connected to the bottom face of the plate ( 60 ), the connecting rod ( 40 ) being provided with an eccentric disc ( 30 ) that comprises two eccentric openings ( 31 ) and ( 32 ) crossed by the eccentric axles ( 10 ) and ( 20 ), respectively; each of the extremity of the eccentric axle ( 20 ) is eccentrically connected to dragging discs ( 50 ), the discs ( 50 ) being located on opposite walls ( 82 ) of a support structure ( 80 ); the eccentric axle ( 10 ) is positioned freely in an opening ( 51 ) centered in the dragging discs ( 50 ), and comprises a non-axial central thickening ( 11 ) that fits into the opening ( 31 ) of the disc ( 30 ); wherein the rotation movements of the dragging discs ( 50 ) and the eccentric axle ( 10 ) are alternating and consecutive.