Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1980-11-04
1982-04-13
Gellner, Michael L.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318616, 352140, 352141, 353101, 354 42, 354 44, 354195, 354271, G03B 310, G03B 710
Patent
active
043244653
ABSTRACT:
An electric motor which can drive the objective of a slide projector or which can adjust the blade or blades of a diaphragm receives signals from the output of an operational amplifier which receives first and second signals from a photosensitive transducer and a differentiating capacitor. The (second) signals from the capacitor are modified (first) signals from the transducer, and the combined intensity of first and second signals is such that the signals at the output of the amplifier reach a value which they would normally reach only when the component has already assumed a predetermined position before the motor can complete the movement of the component to such position. This allows for idling of the motor during the last stage of movement of the component to its predetermined position and/or for braking of the motor during such stage to ensure that the motor can rapidly advance the component during the major part of movement to the predetermined position and the component does not overshoot such position during the last stage of its movement.
REFERENCES:
patent: 3804505 (1974-04-01), Wagensonner et al.
patent: 3896461 (1975-07-01), Higuma
patent: 3946222 (1976-03-01), Swanberg
patent: 4066347 (1978-01-01), Wagensonner
Rossbach Horst
Wagensonner Eduard
Agfa-Gevaert AG
Gellner Michael L.
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