| 摘要 |
<p>Printing apparatus, comprising:
a printing head (1) for printing on printing material (PP);
advancing means (3, 30, 31), located downstream of the printing head (1), from the point of view of normal flow of printing material (PP) through the apparatus, operable to advance the printing material, capable of being driven automatically or under manual control, for feeding the printing material in the printing apparatus;
tensioning means (4), for tensioning the printing material, located upstream of the printing head, having a driving roller (40) arranged to be driven by a tensioning motor (42);
detecting means (32) for detecting distance by which the printing material is fed by the advancing means, operable to output a displacement signal (PS) indicating the detected feeding distance; and
tensioning control circuitry (6), including a driving circuit (63) for driving the tensioning motor (42), operable to generate a tensioning drive signal enabling the driving circuit in response to such a displacement signal (PS) during manual operation of the advancing means;
whereby the driving roller (40) of the tensioning means (4) is rotated by the tensioning motor (42) to tension printing material (PP) upstream of the advancing means (3, 30, 31) during manual operation of the advancing means. </p> |
