| 摘要 |
A dot printing device comprises a printing head including a plurality of needle lines each formed of a plurality of printing needles arranged at a predetermined pitch in a vertical direction, a control circuit for driving the needle lines, and a moving mechanism for moving said printing head in a horizontal direction, thereby allowing the printing head to perform a printing operation. In the dot printing device, the plurality of needle lines are first, second and third needle lines, each printing needle of the second needle line being positioned at an equal height to a corresponding needle of the first needle line in the vertical direction, and each printing needle of the third needle line being positioned at a different height from a corresponding printing needle of the first needle line in the vertical direction by a distance which is half of the predetermined pitch. The control circuit includes a section for selectively setting one of a high-speed printing mode and a high-quality printing mode and driving the first and second needle lines in the high-speed printing mode and the first and third needle lines in the high-quality printing mode. The moving mechanism includes a section for moving the printing head in the high-speed and high-quality printing modes.
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