| 摘要 |
A dot printer is adapted to make test printing by driving dot pins (161 to 167) included in a print head (16) before the first character is printed out. More specifically, a central processing unit (1) makes evaluation of the value of a period of approximately one-third of the period required for depression of a printing sheet by the dot pins, thereby to provide the same to an input/output port (6), before print control data for printing the first character is outputted. The input/output port is responsive to the output from the central processing unit to provide a printer driver (9) with a print timing signal of the pulse width of approximately one-third of the pulse width of the print timing signal required for printing the characters. The print driver is responsive to the applied print timing signal to drive the dot pins. As a result, the dot pins are driven for a time period shorter than the period of the normal dot timing signal and therefore the tip ends thereof are brought to a stop immediately before depression of the print sheet. Accordingly, ink left around the dot pins can be removed without leaving any print out on the print sheet.
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