Abstract: In controlling the thickness of a moving web of material, after it passes through a production station containing a final control element for its thickness, it is moved past a radiometric device which measures the weight of the web per unit area. Downstream from the radiometric device, the web is moved past an optoelectronic device utilizing laser radiation for measuring the thickness of the web. The two measurements are compared and the radiometric device measurement is corrected based on the optoelectronic device measurement and the comparative corrected value is transmitted to a control unit which actuates the final control element in the production station. Preferably, the optoelectronic device is spaced from the production station so that it is out of the range of any significant environmental influences.
Abstract: In the disclosed system a motor axially displaces a screw-threaded movable valve member by rotating it within an interiorly threaded collar. A sensor detects the movable valve member's axial position. An electrical feed-back circuit compares the sensor output with a reference value and drives the motor accordingly. In one embodiment the motor possesses a disc rotor and in another embodiment a moving coil rotor. In each case the stator links the rotor conductors which extend radially from the rotor center.
January 26, 1977
Date of Patent:
January 9, 1979
Frieseke & Hoepfner GmbH
Georg Hartmann, Adam Dittner, Karl Prenzel
Abstract: After gears of a vehicle have been shifted, a controller compares the instantaneous difference between engine and transmission input speeds with the speed difference memorized during the gear shift, and automatically delays clutch reengagement, while the memorized difference is varied by factors including the engine speed and the minimum of engine and transmission speeds, until the resulting two differences reach a predetermined relation. This minimizes clutch wear and jolts.