Releasable ribbon locking device in a ribbon cartridge

Details Releasable ribbon locking device in a ribbon cartridge Releasable ribbon locking device in a ribbon cartridge

1980-07-28

1982-06-29

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Package for ribbon facilitating mounting of ribbon on...

400234, 242 7543, 242197, B41J 3314

Patent

active

043370012

ABSTRACT:
A releasable ribbon locking device is used to keep a ribbon taut in a typewriter ribbon cartridge. The device includes a locking member carrying a blade or brake urged by a spring into abutting relationship with a rotatable ribbon supply support to prevent unwinding of fresh ribbon from the supply. A lock release member is movably coupled to the locking member and supports a ribbon tensioning element in engagement with a portion of the ribbon extending from the ribbon supply. In operation, a ribbon feed mechanism pulls on the ribbon which moves the lock release member through the tensioning element and correspondingly moves the locking member to rotatably free the ribbon supply support from abutment with the brake and allows the ribbon to unwind from the supply. Upon completion of the ribbon feed operation, the spring operates to move the brake against the supply support for preventing indiscriminate unwinding of the ribbon and to move the tensioning element so as to continually engage the ribbon in order to maintain it taut in the cartridge.

REFERENCES:
patent: 1469284 (1923-10-01), Strawn
patent: 1952196 (1934-03-01), Coil
patent: 3442366 (1969-05-01), Spears
patent: 3528536 (1970-09-01), Caudill et al.
patent: 3643779 (1972-02-01), Anderson et al.
patent: 3764438 (1973-10-01), Voss et al.
patent: 4010839 (1977-03-01), Guerrini et al.
patent: 4074799 (1978-02-01), Hishida et al.

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