Positioning control system for alphanumeric displays

Details Positioning control system for alphanumeric displays Positioning control system for alphanumeric displays

1975-12-08

1977-12-20

Curtis, Marshall M.

Communications: electrical

Systems

Portable self-contained

40 31, 40 93, 340325, 340379, G09F 900

Patent

active

040645029

ABSTRACT:
A destination sign for buses is disclosed with an automatic positioning system for a plurality of sign modules. The sign is made up of plural modules, each of which is capable of displaying any one of a set of alphanumeric characters. The display of a module is changed from one character to another by displacement through successive, equal angular increments. The positioning system comprises a reversible drive motor and a common shaft with a separate positioning clutch for coupling each display module to the shaft. The positioning clutch for each module is controlled by a command signal produced by a punch card reader and a shaft position encoder. Various words to be displayed by the sign are encoded on respective punch cards and insertion of a selected punch card into the card reader causes the positioning system to execute a reset cycle and a positioning cycle to display the selected name.

REFERENCES:
patent: 1016944 (1912-02-01), Kent
patent: 1872145 (1932-08-01), Hurford
patent: 2167505 (1939-07-01), Griffith
patent: 3510583 (1970-05-01), Kern
patent: 3582937 (1971-06-01), Dozer

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