| 摘要 |
<p>The present invention concerns a mechanical, low-noise press, particularly of the screw type, comprising a tup-bearing ram (12, 28) connected with a driving screw (13, 24), rotatingly connected with a lead nut (14, 21-23), which is integrally fixed on the frame supporting the press (10). The press also comprises sealing means (18, 19, 30) which define, together with the mating surfaces of the screw and of the lead nut, at least one chamber (16, 31), having a pre-determined volume, adapted to collect an incompressible medium, such as lubricating oil, and circulation means (16, 17, 19, 20) in order to maintain within said chamber a controlled delivery of the medium. Such delivery insures the presence of a constant spacing film of medium between the mating surfaces during the operation phases of the press, so as to prevent, during such phases, the direct contact between the screw and the lead nut, thereby absorbing the vibrations and the collisions generated by their interaction.</p> |
