| 摘要 |
PURPOSE:To output an image having the gradation of a dot unit to a recording medium, by changing the contact area of a pin with an ink ribbon by changing the force acting on the pin on the basis of gradation data showing a gradation degree. CONSTITUTION:A printing pin 4 is composed of a wire having elasticity and has an inclined surface 12 formed to the leading end part thereof. When the printing pin 4 is struck by weak impact force, only the leading end part thereof is brought into contact with an ink ribbon 5 to print a small dot l13a and, when said pin 4 is struck by the strongest impact force, the pin 4 is bent by said impact force and the whole of the inclined surface 12 is brought into contact with the ink ribbon 5 to print a large dot 13d. CPU 10 outputs the signal operated by a conversion table to a printing head driver 11 on the basis of the gradation data outputted from a gradation data generator 8 to move a printing head 3 and selects the impact force of each printing pin 4 to strike said pin 4. |
