초록 ▼

An active pneumatic mechanism and a passive hydraulic mechanism of the apparatus are so connected with each other and with a driven member that movement imparted by the pneumatic mechanism to the driven member produces, and is controllable by restriction of, hydraulic fluid flow within the hydraulic

An active pneumatic mechanism and a passive hydraulic mechanism of the apparatus are so connected with each other and with a driven member that movement imparted by the pneumatic mechanism to the driven member produces, and is controllable by restriction of, hydraulic fluid flow within the hydraulic mechanism. Restriction of the fluid flow to any desired extent is accomplished by command signals directed by a control computer to a valve that preferably is of the type actuable by a torque motor. The command signals produced by the computer are based upon a correlation of data supplied by a computer program with data supplied by a monitor of the positions of the driven member along its path of travel. Precise control of the speeds, accelerations and positions of the driven member are realized.

대표청구항 ▼

In a hydropneumatic drive apparatus for imparting controlled movement to a driven member moveable between spaced positions along a path of travel; said apparatus including an active pneumatic mechanism and a passive hydraulic mechanism connected with each other and with said member such that movemen

In a hydropneumatic drive apparatus for imparting controlled movement to a driven member moveable between spaced positions along a path of travel; said apparatus including an active pneumatic mechanism and a passive hydraulic mechanism connected with each other and with said member such that movements imparted to said driven member by said pneumatic mechanism produce, and are retarded by restriction of, flow of hydraulic fluid within said hydraulic mechanism, the improvement comprising: said passive hydraulic mechanism including valve means responsive to command signals directed thereto for varying said flow of fluid within said hydraulic mechanism between a condition of substantially unrestricted fluid flow, a condition of substantially completely restricted fluid flow, and a substantially limitless number of partially restricted fluid-flow conditions; and signal-producing control means for directing command signals to said valve means causing the same to so vary said fluid-flow conditions as to control speeds and accelerations of said movements imparted to said driven member by said active pneumatic mechanism.