Print thimble recognizing system for a serial printer

Details Print thimble recognizing system for a serial printer Print thimble recognizing system for a serial printer

1983-11-14

1986-07-15

Wright, Jr., Ernest T.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

400175, 400257, B41J 132

Patent

active

046003240

ABSTRACT:
In a printer adapted to receive any of a plurality of petal-type printing thimbles, each of the printing thimbles is provided with a recognition code-forming portion containing a plurality of protuberance-forming positions, the arrangement of protuberances at the protuberance-forming positions defining a thimble recognition code which identifies specific character position, hammer impression, and character spacing tables. These tables identify the character positions, hammer impression forces and character spacings required to print characters designated by character codes when the recognition code identified printing thimble is mounted on the printer. A mechanical means, mounted on the printing hammer cover of the printer carrier unit, detects the presence or absence of protuberances at the protuberance-forming positions of the code forming portion on the printing thimble, to generate a binary recognition code received by the printer processor. The mechanical means includes an electrical switch, selectively opened or closed by the presence or absence of protuberances.

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