G - Physics – 09 – F
Patent
G - Physics
09
F
40/10
G09F 11/02 (2006.01)
Patent
CA 1052096
ABSTRACT OF THE DISCLOSURE A changeable alphanumeric sign with printed characters is disclosed. The sign is universally changeable in the sense that any combination of alphanumeric characters may be displayed by selectively positioning a set of display tapes in each character window. This arrangement minimizes the length of dis- play tapes required. Each tape of a set of tapes is printed on both front and back surfaces with character segments and is connected between a driving roller and a driven roller in a manner to display one front surface segment and one back surface segment at a time. The tape segments which carry the respective character segments are progressively longer from one end of the tape to the other and the set of tape segments which are dis- played together in the window all bear different character segments of the same character so that an entire character is displayed. All tapes in the sat are driven in unison to successively present the character segments of each tape in registry with respective window segments. An open-loop posi- tioning system is used to position all sets of tapes concurrently but independently to change the characters of the sign.
245005
Narey James O.
Saylor William H.
LandOfFree
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