Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1975-08-27
1977-10-18
Schaefer, Robert K.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318 59, 318 85, 198503, G05B 1928
Patent
active
040548236
ABSTRACT:
A control apparatus for manufacturing or treatment processes in which articles or batches of articles are conveyed through a process station on endless conveyor means. The apparatus comprises electrical signal producing means for producing at its output an article or batch digital signal dependent upon the length of the conveyor means associated with one article or batch of articles. Electrical reference means capable of being set with a digital value representing the effective length of the conveyor means are provided together with electrical comparator means for receiving the signals at the outputs of said signal producing means and said reference means and for determining whether the effective length of the conveyor is an exact multiple of the length associated with the article or batch. The comparator means produces at its output a signal proportional to the deviation from the exact multiple, which serves to effect an increase or decrease of the speed of the drive means whereby an exact multiple is achieved.
REFERENCES:
patent: 3485339 (1969-12-01), Miller et al.
patent: 3593008 (1971-07-01), DeWitt et al.
patent: 3646417 (1972-02-01), Cassie et al.
patent: 3668498 (1972-06-01), Austin
patent: 3838321 (1974-09-01), Damm et al.
patent: 3923147 (1975-12-01), Quinn
Drucker William Anthony
Feldhaus John J.
Schaefer Robert K.
Watkin Elliott Systems Engineers Limited
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