| 摘要 |
PURPOSE:To make possible the control of a movement position and a movement value in a vertical direction with the printing surface of a carriage and also the shortening of printing time by providing a stepping motor which moves a carriage moving in a main scan direction with a printing medium, and causing the motor to move the carriage to move backward and forward to a platen. CONSTITUTION:A control section 44 which detects the thickness of a printing medium with the help of a medium thickness detection section 43 applies, for instance, 20 pulses to a stepping motor 12 to rotate a drive pulley 11 to a 'G' position for obtaining a gap through which a medium passes. Consequently, a carriage 4 moves toward a carriage base 5. If for instance, 5 pulses are applied to the stepping motor 12 in consideration of the thickness of a printing medium to rotate the drive pulley 11 in an arrow, direction 'H', and wire rope 10 moves to an arrow position 'B', the carriage 4 which is energized in advance to the arrow position 'D' by a coil spring 21 moves to the arrow position 'D' sliding over the surface of the printing medium, and the printing medium is pressed by a printing medium pressure roller 2. If an ink ribbon case is replaced, 50 pulses are applied to the stepping motor 12 and thereby the carriage 4 moves away from the platen 13 by an amount enough for the ink ribbon case 3 to be replaced. |
