| 摘要 |
PURPOSE:To enable employment of an extremely slender printing wire having a uniform section and being low-cost by specifying the relationship between a printing drive period of a printing wire driving element and a natural frequency period of a span of the printing wire of which the support point is a guide hole part and the fixed point is a fixed part of the wire with a lever body, and by suppressing the vibration of the printing wire positively. CONSTITUTION:A printing wire 2 becomes a vibration system of a span of which the fixed point is a fixed part 20 of the wire and the support point is a first axial bearing part 62 directed to the fore end part of the wire or a wire guide 61 if the wire has not the bearing part 62. By setting the relationship between a primary natural frequency period TW of this vibration system and a drive period TF of printing as TF=(N+0.5)+0.2XTW (where N is an integer and N >=3), the vibration delta of the printing wire 2 of the span is suppressed at the time of successive printing, since the vibration generated in the previous printing becomes reverse in phase to the vibration generated in the current printing at that time and they cancel each other. In printing at intervals of one dot as well, subsequent printing is conducted after the vibration delta of the printing wire 2 is attenuated and therefore the vibration is not increased. According to this constitution, an extremely slender wire being weak in strength but having a uniform section can be employed and the lifetime thereof can be prolonged. |
