| 摘要 |
An ink ribbon cassette is removably mounted on a printer and coacts with a reciprocable printing head to effect a printing operation. The cassette has a case containing an ink ribbon, and a pair of arms extending in opposed relation from opposite ends of the case and having slits through which the ink ribbon extends to form an exposed ribbon portion in the region between the arms. A ribbon guide is slideable along a guide shaft mounted on the case and is releasably carried on the printing head to reciprocate together with the printing head during the printing operation for guiding the ink ribbon. The ribbon guide has sets of retaining claws which slidably engage lengthwise with the upper and lower marginal edge portions of the ink ribbon for restricting vertical displacement of the ink ribbon relative to the case while allowing lengthwise sliding movement of the ink ribbon. By such a construction, slackening of the exposed ribbon portion is prevented and a predetermined confronting positional relation between the ink ribbon and the printing head is maintained.
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