| 摘要 |
The machine comprises a screen (12) of drum form comprising two rigid annular elements (11), positioned on the two flat ends and arranged to maintain the screen surface under axial tension; there are also provided a horizontal outer shaft (21) rigid with the fixed structure (9) and projecting from it, and an inner shaft (22) coaxial with and movable axially relative to the outer shaft (21) and inserted telescopically into this latter, and having a front end (22') projecting from the front end of the outer shaft (21); a first group (41) of radial means being fixed to the end (22') of the inner shaft (22); a second group (42) of radial means being rotatably and coaxially coupled to the outer shaft (21); said groups (41, 42) of radial means being arranged to press axially against the two annular elements (11) of the drum (10) in such a manner as to withdraw them from each other in an axial direction; a thrust means (30) being provided to move the inner shaft (22) axially to the outer shaft (21), and a motion transmission system for rotating with the same motion both the groups (41, 42) of radial means. |
