| 摘要 |
In a thermal printer in which ink is transferred from a single-use thermal print ribbon to a substrate such as packaging material by energising selected print elements of a thermal print head (22), a first print run is executed by energising only a group of pri nt elements in registry with one half of the ribbon width so that ink is depleted only from one half of the ribbon, and a second print run is executed by energising the same group of e lements using the same ribbon but with the ribbon supply and take-up spools interchanged in order that ink is depleted only from the other half of the ribbon. This allows printin g on comparatively narrow printing areas using ribbon which is at least twice the wid th of the printed area without undue ribbon wastage and with reduced ribbon breakage frequ ency compared to the breakage frequency with a ribbon of a width nearer to the width of the printed area.
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