Elevator mechanism for the code reader of a mail sorting machine

Details Elevator mechanism for the code reader of a mail sorting machine Elevator mechanism for the code reader of a mail sorting machine

1983-07-11

1988-04-19

Reeves, Robert B.

Classifying, separating, and assorting solids

Sorting special items, and certain methods and apparatus for...

Condition responsive means controls separating means

209584, 209900, B07C 314

Patent

active

047383682

ABSTRACT:
An elevator for adjusting the elevation of a code reader of a high speed mail sorting machine. The elevator is powered by a reversible DC electric motor which operates an extensible and retractable linear actuator. The actuator connects with a platform on which the reader is mounted. A control circuit for the motor includes a digital comparitor which compares the desired elevation of the reader with the actual elevation sensed by a potentiometer. A transistorized motor drive circuit controlled by the comparitor applies current to the motor in opposite directions to cause extension or retraction of the actuator, depending upon whether the reader is below or above the desired elevation. Upper and lower limit switches limit the range of movement of the reader.

REFERENCES:
patent: 2928953 (1960-03-01), Bassler
patent: 3122689 (1964-02-01), Atkinson
patent: 3297925 (1967-01-01), Masel
patent: 3697849 (1972-10-01), Uchida
patent: 3737629 (1973-06-01), See
patent: 3886371 (1975-05-01), Lloyd
patent: 3983366 (1976-09-01), Gunn
patent: 4112343 (1978-09-01), Douglas
patent: 4464614 (1984-08-01), Kurakake

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