Hydraulic pressing and/or cutting tool and mechanism for converting a rotary motion into a translational oscillating motion for this tool

A motion converting mechanism (8) for a hydraulic pressing and/or cutting tool (1) of the type comprising:

• an electric motor (6) powered by an accumulator (5) and comprising a drive shaft (9);
• a converting mechanism (8) connected to the drive shaft (9) and suitable to convert the rotary motion of the drive shaft (9) to an oscillating translational motion;
• a hydraulic pump (11) connected to the converting mechanism (8) and suitable to carry out, in response to the oscillating translational motion, an increase in the pressure of a pressure fluid acting on a drive piston (12) such as to displace the drive piston (12);
• two jaws (13, 14) connected to the housing (2) in a movable manner relative to each other, of which at least one movable jaw (14) is connected to the drive piston (12) such that, in response to the displacement of the drive piston (12), the jaws (13, 14) carry out a relative movement for performing compression or cutting,
• characterized in that the motion converting mechanism (8) comprises:
• an epicycloidal gear (16) connected to the drive shaft (9) and suitable for reducing the rotary motion of the drive shaft (9);
• a thrust unit (17) comprising a rotating plate (18), a displaceable but rotatably-locked plate (10), and cam-thrust members (19) arranged between the two facing plates and in rolling contact with rolling tracks (20, 21) thereof, wherein at least one of the rolling tracks (20) is cam-shaped such that the rotation of the rotating plate (18) causes a translational oscillating motion of the translatable plate (10), wherein the thrust unit (17) is co-axial with the epicycloidal gear (16) and the rotating plate (18) is connected by means of pins (25) to a train of planets (22) of the epicycloidal gear (16) such as to rotate in response to the revolution motion of the train of planets (22).