Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1974-04-24
1976-03-09
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318696, G05B 1942
Patent
active
039434222
ABSTRACT:
In the automatic reading of a weave design from a pattern including weft rows and warp rows, the advance of the reading assembly (photo-electric cells) from one weft row to the next one is effected by a step-by-step electric motor which receives "secondary" pulses from a ring counter to which "primary" pulses are applied, whenever the number of such "primary" pulses received by said counter is equal to the quotient of the number of "primary" pulses required to displace said assembly from one extreme weft row to the other one, divided by the number of weft rows minus one unit, this quotient being taken as an integer.
The incremental advance of the reading assembly for each step of the motor is much smaller than the centering tolerance of said assembly required to place it in front of each weft row, and the number of "primary" pulses required to determine such a step is selected much higher so that the error which results from the fact that the quotient is limited to an integer is also negligible.
REFERENCES:
patent: 2866506 (1958-12-01), Hierath et al.
patent: 3054036 (1962-09-01), Lenk et al.
patent: 3280399 (1966-10-01), Kreinberg
patent: 3297927 (1967-01-01), Blakeslee et al.
patent: 3373267 (1968-03-01), Swann
patent: 3461365 (1969-08-01), Newland et al.
patent: 3569813 (1971-03-01), Clark et al.
Dobeck Benjamin
Verdol S.A.
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