| 摘要 |
A printing machine wherein printing on to a substrate is effected by a first movement of a print head (1) downwards into contact with the substrate and then by a second movement over the surface of the substrate while thermal printing elements in the print head (1) are selectively energised. The first movement is controlled by downward movement of a pair of rollers (6,7) operated by synchronized angular movement of a pair of eccentric shafts (8,9) one of which is freely mounted within each roller (6,7). The first and second movements are driven by a first and second stepper motor respectively. The rollers may be coupled by drive belts (4,5).
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