| 摘要 |
A tensioning device is disclosed in which a capstan (10) is adapted for receiving a spool of tape or ribbon, for example of the erase type, on its central portion (4, 13). A toothed gear wheel (16) is connected to the capstan (10). A slider (1) is provided with at least one tooth (15) which is adapted to be engaged with the gear wheel (16). The slider (1) is biased in one direction in a recess (8) by means of a spring (2) and is arranged to slide within the recess (8), in the opposite direction only, to an extent which is sufficient to allow the tooth or teeth (15) and the toothed gear wheel (16) to slip relative to each other. This permits the capstan (10) to make a rotation in a stepwise manner, the length of the steps being dependent on the number of teeth on the slider (1) and the pitch or spacing thereof. |
