Mechanism for preventing slack in printer carbon ribbon

Details Mechanism for preventing slack in printer carbon ribbon Mechanism for preventing slack in printer carbon ribbon

1993-04-15

1994-03-29

Eickholt, Eugene H.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

242 75, B41J 3114

Patent

active

052978796

ABSTRACT:
A mechanism for preventing slack in a printer carbon ribbon includes a reverse rotation mechanism for applying a rotational force to the carbon ribbon feed shaft in the reverse direction from that for feeding the carbon ribbon irrespective of the direction in which a label strip or other printable medium is being fed. The reverse rotation mechanism comprises a first reverse rotation sub-mechanism for applying a rotational force to the carbon ribbon feed shaft in the reverse direction from that for feeding the carbon ribbon when the printable medium is being fed in the forward direction and a second reverse rotation sub-mechanism for applying a rotational force to the carbon ribbon feed shaft in the reverse direction from that for feeding the carbon ribbon when the printable medium is being retracted in the reverse direction. The mechanism is particularly applicable where a drive motor is used both to move the printable medium and to take up the printer carbon ribbon. If the direction of the drive motor is reversed to move the printable medium in a reverse direction, the printer carbon ribbon will thus not be provided with slack.

REFERENCES:
patent: 4591879 (1986-05-01), Yokota et al.
patent: 4767228 (1988-08-01), Harry
patent: 4812063 (1989-03-01), Kunimitsu et al.
"Ribbon Feed for Bidirectional Printer" IBM Tech. Disclosure Bulletin, vol. 23, No. 4, Sep. 1980 pp. 1517-1520.

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