| 摘要 |
A traction device has an origin cylinder (1) of heat-sensitive ink ribbon (2), a rewinding cylinder (5), traction means and a marking header. The device prevents unused segments of ribbon being left between markings. The device has a moving support (6) guiding the ribbon (2) along an additional path (16), braking means (10, 11, 12, 14) for the origin cylinder (1). When the ribbon (2) is tractioned and the origin cylinder is braked, the support (6) is forced to move against the action of an elastic element (13), reducing the additional path (16). Thus, after a marking (a-b) the ribbon and the support (6) move back so that the next marking (b-d) is made immediately after the first marking (a-b). The braking means, after one or more markings, are released, unrolling a length of ribbon (2) from the origin cylinder, then braking again, with the process repeated.
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