| 摘要 |
<p>A drive ram, particularly for a yarn winder, has the piston rod (6) freely movable relative to both the piston (11) and the ram cylinder (17, 22) in a first condition in which a locking washer (16) is perpendicular to the longitudinal axis of the piston rod (6). Upon application of fluid pressure to effect relative movement of the piston (11) and the cylinder (17,22), the locking washer (16) is spring-urged against a wedge-like tipping washer (19) which skews the locking washer (16) and causes it to clamp the piston rod (6) whereby the piston rod is then driven by the ram through a predetermined travel, from a starting position which is governed only by the diameter of the package at the time of operation of the package lift mechanism.</p><p>This allows a virtually constant lift travel of the ram, regardless of the diameter of the package at the time of operation of the ram.</p> |
