| 摘要 |
<p>The structure described in this invention consists of a cross-beam (8) which has a series of enclosed, internal, fixed, sealed seats (9) for housing pneumatic means (7), these seats being situated centrally and crossways to the longitudinal axis of the beam (8). The beam has a first and a second duct (10 and 11) independent from and parallel to each other, running the entire length of the beam (8) which also act as ducts for the entry of air from the outside and for the discharge of air being exhausted from the pneumatic means (7) respectively. Control means (12) can also be located on the beam (8) connected on the inlet side with the first duct (10) and operating, on the outlet side, on each of the pneumatic means (7) in order to enable the latter to move the presser plates (6).</p> |
