| 摘要 |
The device comprises a longitudinal guide rail (14) mounted on a stationary part of the frame (10, 12), a lower conveyor mounted on a lower longitudinal member (30), and, in correspondence, an upper conveyor secured by adjustable means (44, 47) to an upper longitudinal member (43) integral with a bracket (50). The upper longitudinal member (43) of the upper conveyor is connected via the bracket (50) directly to the lower longitudinal member (30) of the lower conveyor and the exit end of the lower longitudinal member (30) is mounted, pivoting (16) in a horizontal plane, on a stationary part of the frame (10) close to the guide rail (14), it being possible for the entry end of the lower longitudinal member (30) to be separated from the guide rail (14) by a predetermined value by virtue of mechanical or electromechanical means (55, 56). <IMAGE> |
