Print ribbon cassette including ribbon tensioning means

Details Print ribbon cassette including ribbon tensioning means Print ribbon cassette including ribbon tensioning means

1985-07-23

1986-08-12

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Package for ribbon facilitating mounting of ribbon on...

400228, 400234, B41J 3200

Patent

active

046053271

ABSTRACT:
A print ribbon cassette of a simplified construction which can prevent slackening of a print ribbon and normally keep the print ribbon in taut condition for printing. The print ribbon cassette comprises a lock member having a locking position for preventing inadvertent rotation of a feed spool on which a print ribbon to be supplied is wound. The cassette further comprises a ribbon lock control member which is moved between an operative position and an inoperative position in response to a tensile force of a print ribbon applied thereto. In the operative position of the ribbon lock control member, it engages with the lock member and holds the same to the lock position.

REFERENCES:
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patent: 4010839 (1977-03-01), Guerrini et al.
patent: 4074799 (1978-02-01), Hishida et al.
patent: 4225100 (1980-09-01), Sugawara
patent: 4232840 (1980-11-01), Sugawara
patent: 4337001 (1982-06-01), Cappotto
patent: 4368992 (1983-01-01), Gagnebin
patent: 4373824 (1983-02-01), Olsen
patent: 4447020 (1984-05-01), Toi et al.
patent: 4470560 (1984-09-01), Yoneya et al.
patent: 4505605 (1985-03-01), Hasegawa et al.
patent: 4523868 (1985-06-01), Shadwick
patent: 4533266 (1985-08-01), Saito et al.
IBM Technical Disclosure Bulletin, "Constant-Tension Ribbon Cartridge", Bullock et al, vol. 23, No. 5, Oct. 1980, pp. 1741-1742.

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