| 摘要 |
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.
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