| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an endless ink ribbon cassette which has a mechanical fuse which is more hard to be broken than a positive rotation, even if the power of reverse rotation is applied due to a printing apparatus and user's operational errors. <P>SOLUTION: The ribbon cassette of the printing apparatus includes a power transmission means 5 in which an engaging part 7 which is detachably provided in a ribbon take-up gear 3 and engaged to a ribbon drive shaft 31 of the printing apparatus; a first connection part 8a which transmits powers of positive/reverse both directions to the ribbon traveling of the printing apparatus to the ribbon take-up gear 3; and a second connection part 8b which transmits power only to the reverse direction. When the power transmission means 5 performs positive rotation, and when the ribbon take-up gear 3 stops rotation due to ribbon lock, the first connection part 8a is destroyed and power transmission between the power transmission means 5 and the ribbon take-up gear 3 becomes impossible. When the power transmission means 5 performs reverse rotation, even if the load corresponding to the ribbon lock is applied to the ribbon take-up gear 3, the connection part is difficult to be destroyed compared with a positive rotation by the action of the second connection part 8b. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
