Ribbon position selecting device for printer

Details Ribbon position selecting device for printer Ribbon position selecting device for printer

1986-05-19

1991-01-08

Crowder, Clifford D.

Typewriting machines

Including interposed inking device for record-medium

Including mechanism for shifting ribbon laterally at...

B41J 3514

Patent

active

049830570

ABSTRACT:
In a ribbon position selecting device for a printer which includes a step motor for driving a ribbon base retaining a ribbon cassette to locate a ribbon at a predetermined position, the present invention comprises a stopper for determining a reference position of the ribbon cassette, and a power transmitting mechanism for transmitting power of the step motor to the ribbon base. The power transmitting mechanism comprises a torque limiter and a one-way clutch. When the ribbon cassette is brought into abutment against the stopper, the step motor is rotated without step out owing to the torque limiter to prevent deviation in phase at the stop position. In contrast, when the ribbon cassette is driven to separate from the stopper, slipping in the power transmitting mechanism is eliminated by the one-way clutch to secure feeding of the ribbon cassette, thereby eliminating the possibility of mixing of colors.

REFERENCES:
patent: 2747718 (1956-05-01), May
patent: 3595362 (1971-07-01), Wolowitz
patent: 3891078 (1975-06-01), Jung
patent: 4341479 (1982-07-01), Sanada
patent: 4368993 (1983-01-01), Brass et al.
patent: 4573813 (1986-03-01), Aoki et al.
patent: 4693619 (1987-09-01), Ishii et al.

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