A controller which is adapted to accept two input signals and produce a third signal which is applied as the analog of the rate of change of a fourth variable affecting one of the input signals.

A controller for producing electrical control signals has a relatively stationary supporting section providing an upwardly facing hand supporting surface and an upward projection, and has a stick-like control section mounted on a first gimbal joint on top of the projection, to swing about pitch and roll axes. A second gimbal joint is spaced along the roll axis from the first one and rotates about said roll axis and about a gimbal axis parallel to the pitch axis. A gimbal ring of the first joint …

A controller for use in an object oriented environment connecting an information interface for a network user to a database. The controller optimises a memory usage in the environment by automatically generating a sub-object exist code used to ensure that all sub-objects of a released object are removed from memory. The controller also simulates a three tier client server model in which the class structure of the middle tier is retrieved from a database table allowing automatic amendments to the…

A programmable controller includes a terminal which receives input data from an input unit and outputs output data to be applied to an output unit. The programmable controller also includes a communication unit which executes a serial communication with the terminal to send the output data to the output unit and to receive the input data from the input unit. A control unit repeatedly executes an input process for reading the input data received by the communication unit, an output process for se…

In a controller, a control member includes a stick portion to be manipulated with the hand, and a spherical portion, which are integrally formed. The control member is provided with a coil spring for urging the spherical portion, and a magnetic attracting member for attracting the control member opposite from the urging direction. When the control member is urged by the urging means, the spherical portion is held by a friction member so as to increase the load on the control member. In contrast,…

A controller in which a dead space for wiring is reduced, its input-and-output response time is shortened, and miniaturization and cost reduction is ensured. A RS-232 connector connection unit (6) and a peripheral connector connection unit (7) are lowered than a projection (4) provided with displays (12.sub.1 to 12.sub.4) so that a cable connector does not exceed the projection (4) when the connector is mounted on the connector connection units (6) and (7).

A controller comprises a valve body having a valve element and a valve seat defining a fluid cannel openable and closable with a reciprocating upward and downward movement of a valve stem, a casing fixed to an upper portion of the valve body, an operating rod provided in an upper inside portion of the casing upwardly and downwardly movably, a drive device for moving the rod upward and downward, and a transmission device provided in a lower inside portion of the casing for transmitting a force ac…

A controller for controlling a non-linear mechanical system having a plurality of degrees of freedom, comprises compensation means to compensate the non-linear behavior of the mechanical system, the controller further comprises a reference model of both a control unit and the linearized mechanical system, and the controller further comprises adaptation means which adapts the compensation means in dependence on a difference between an output signal of the mechanical system and an output signal of…

A controller comprises a valve body having a valve element and a valve seat defining therebetween a fluid channel openable and closable with reciprocating upward and downward movement of a valve stem, a casing fixed to an upper portion of the valve body, an operating rod provided in an upper inside portion of the casing and movable upward and downward, a drive device for moving the operating rod upward and downward, and a force transmission device provided in a lower inside portion of the casing…

A portable controller (110) for controlling the level of water in a swimming pool, including: a container (111) adapted to rest in a predetermined position adjacent the pool in which the water level is to be controlled, said container having a base (112) and one or more side walls (113, 114, 116, 117) extending upwardly from said base, an inlet in one of said one or more side walls for receiving water into the container and an outlet in or over at least one of said one or more side walls above s…