| 摘要 |
A cartridge for accommodating a daisy wheel type printer includes a supply spool for holding a fresh supply of ribbon and a take-up spool for holding used ribbon. The cartridge includes two arms which define a path for the ribbon to pass between the paper and the printer mechanism. In one embodiment, two drive gears are serially engaged with each other and with a ribbon drive wheel. When the first drive gear is driven by a drive shaft of the printer, the direction of ribbon advance is the same as that of the rotation of the drive shaft. When the second gear is driven, the rotational direction of the ribbon advance is opposite that of the drive shaft. In an alternate embodiment, a ribbon drive gear is mounted on a common shaft with the first drive gear and biased against a single idler wheel.
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