| 摘要 |
PURPOSE:To obtain a small-sized printing head obtaining large displacement quantity, stabilized in printing operation and imparting good printing quality, by using a buckling spring displaced and enlarged by a lever arm and the own deformation. CONSTITUTION:In a piezoelectric type printing head wherein a printing needle 8 is allowed to freely fly by the extending and contracting action of an electrostriction or piezoelectric element 1 to perform printing, a lever arm 4 for transmitting the operation of the electrostriction or piezoelectric element 1, a buckling spring 6 connected so as to receive the transmission of displacement in the axial direction from the leading end of said lever arm 4, a movable part 7 arranged so as to freely fly to a printing direction upon the reception of force from said buckling spring 6 and a return spring 9 for returning said movable part 7 and the printing needle 8 is provided to the movable part 7. The displacement quantity of the electrostriction or piezoelectric element 1 is enlarged by the lever arm 4 and the buckling spring 6. The movable part 7 having the printing needle 8 is supported by the return spring 9 to receive force from the buckling spring 6 and freely flies at the time when the speed of the buckling spring 6 is max. and the printing needle 8 also operates forwardly along with the operation of the movable part and the return spring and strikes a platen 11, printing paper 12 and an ink ribbon 13 to perform printing operation. |
