Information retrieval system having ramp motor control

Details Information retrieval system having ramp motor control Information retrieval system having ramp motor control

1976-10-01

1978-01-03

Canney, Vincent P.

Optics: image projectors

Selective data retrieval

226 33, 360 72, G06F 1304, B65H 2318

Patent

active

040663493

ABSTRACT:
The disclosure relates to a scanning means for use in an information retrieval system for locating a preselected information bearing element out of a plurality of information bearing elements which are consecutively numbered for identification. The scanning means includes a ramp generator which generates a ramp voltage, drive means for driving the information bearing elements in first and second directions at a rate substantially proportional to the magnitude of the ramp voltage, sensing means for sensing the elements as they are driven, means for causing the drive means to drive the information bearing elements in the first or second direction towards the selected element, means for resetting the ramp generator when the drive means drives the selected element past the sensing means and disabling means for disabling the ramp generator when the selected information bearing element has been located.

REFERENCES:
patent: 3727203 (1973-04-01), Grossman
patent: 3736565 (1973-05-01), Sidline
patent: 3809302 (1974-05-01), Malyon
patent: 3926513 (1975-12-01), Silver et al.

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