| 摘要 |
<p>The control apparatus consists of a precise command valve for lifting which is branched in parallel on the hydraulic command distributor of the press cylinder. It may be brought into the active position or the reverse by a variable cam on the bearing. The valve ensures after movement of the bearing, not only precise positioning of the bearing, but also that it is maintained at the desired height even during prolonged stops from working. The usual mechanical stops are not required and the change to different limiting values for the height can be simply and rapidly effected.</p> |
