Abstract: Device for causing epicycloid vibration, characterized in that it comprises at least one shaft secured by one of its ends to a bed connected by elastic means to the frame of the machine and furthermore supporting a thermoplastic component, the said shaft being provided at this end with a magnetic outgrowth, which when made to rotate inside a plurality of magnetic fields brought about by switching on a plurality of electromagnets located about the said shaft, generates an epicycloid-type movement of the bed, the other free end of the shaft being, on the one hand, guided in rotation within the frame of the machine and, on the other hand, driven in rotation by a motor.