Electricity: motive power systems – Automatic and/or with time-delay means – Radiant energy
Patent
1989-09-29
1990-04-17
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Radiant energy
318433, H02P 700
Patent
active
049183613
ABSTRACT:
A reel for webs of photographic material can be driven clockwise and counterclockwise by a reversible d-c motor through the medium of the output shaft of the motor, a second shaft which is coaxial with the output shaft and serves to rotate the reel, and a torsion spring between the shafts. Each shaft carries a disc-shaped polarizing filter, and both filters extend across the path of propagation of radiation from the radiation source to the transducer of an analog optoelectronic detector. The characteristics of signals which are generated by the transducer vary as a function of the extent of angular displacement of the shafts and filters relative to each other. Such signals are transmitted to an evaluating circuit which controls the flow of energy to the motor as a function of deviations of the characteristics of transmitted signals from the characteristics of a reference signal. The purpose of the evaluating circuit is to ensure the transmission of constant torque to the second shaft irrespective of the direction of rotation of the motor.
REFERENCES:
patent: 2167484 (1939-07-01), Berry
patent: 2425541 (1947-08-01), Konet
patent: 2945167 (1960-07-01), Gunther
patent: 3098186 (1963-07-01), Williamson et al.
patent: 3117266 (1964-01-01), Raymond
patent: 3193744 (1965-07-01), Seward
patent: 4736140 (1988-04-01), Ernst
Agfa-Gevaert Aktiengesellschaft
Kontler Peter K.
Ro Bentsu
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