| 摘要 |
An impact printer having a plurality of printing wires (7); driving means (5) for driving said printing wires (7) to effect printing; control means (2,3) arranged to transmit selectively to the driving means (5) either a printing signal, as a result of which the driving means (5) are energized to effect printing, or a warming-up signal as a result of which the driving means (5) are energized without printing being effected, and selector means (1) for causing the control means (2,3) to produce either a printing signal or a warming-up signal, characterised in that the selector means comprises a temperature detecting means (1) such that a said warming-up signal is transmitted to the driving means (5) only when the temperature sensed thereby does not exceed a respective predetermined value. |
