Ribbon cartridge with back check

Typewriting machines – Including interposed inking device for record-medium – Package for ribbon facilitating mounting of ribbon on...

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Details

400234, B41J 3314

Patent

active

044498373

ABSTRACT:
A ribbon cartridge having a supply spool (3) and a take-up spool hub (27) to receive ribbon (1). A section (49) of a wire (32) extends from the mounting post (33), with its pointed end resting against the take-up hub (27). Movement in the take-up direction causes a sliding action. Attempted unwinding causes the end to dig into the take-up hub (27) so that the wire section (49) immediately prevents unwinding.

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IBM Technical Disclosure Bulletin, "Typewriter Ribbon Cartridge Take-up Spool Bias Spring with Loop Unwind Control", Aldrich, vol. 24, No. 8, Jan. 1982, pp. 4312-4313.
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