| 摘要 |
A print ribbon cassette includes a supply roll and a take-up roll so that the print ribbon unwound from the supply roll is presented for use in printing and thereafter wound around the take-up roll. The cassette also includs an endless belt extended around a driving roller and a pair of belt rollers. The driving roller is provided fixed in position and coupled to a driving motor of a printer when the cassette is mounted on the printer. On the other hand, the belt rollers are rotatably mounted on separate support arms which are pivotally mounted on the cassette. When the support arms are located at an operative position as extending substantially in a line and opposite in direction, the belt is brought into driving engagement with both of the supply and take-up rollers. When the support arms are located at an inoperative position as extending substantially in the same direction, the belt is effectively disengaged from both of the supply and take-up rollers, thereby allowing both of the supply and take-up rollers to be replaced with ease.
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