The object of the invention is a cutting device to the blades and the other hand, -, in a semi - alternating movement, comprising a frame (10) intended to be attached to a manipulation arm, comprising a longitudinal axis xx 'and a transverse axis yy ′, the means (12), a counter - blade (14) integral with said frame (10), a plate (16), means (18), characterized in that the means (12) motors comprise a motor m with a shaft (28) and the means (18) for guiding the blade (16) comprises a mounting with eccentrics, driven in rotation by said shaft (28) of the motor m, so as to generate an elliptical movement.
