| 摘要 |
An ink jet printer is composed of a rotary drum (10) having a peripheral surface (11) for holding a paper sheet, a print head (200) for printing an image on the paper sheet held on the peripheral surface (11) by jetting ink to the paper sheet, and an elevator mechanism (300) for setting the print head (200) to a printing position close to the peripheral surface (11) at a time of printing and to a non-printing position farther from the peripheral surface (11) than the printing position along a normal line of the peripheral surface (11) at a time of maintenance. Particularly, the elevator mechanism (300) includes a pair of guide rails (301) set parallel to the normal line of the peripheral surface (11), a slider unit (309, 311, 315, 331) rotatably holding the print head (200) and slidably attached to the guide rails (301), and a driving section (321) for moving the slider unit (309, 311, 315, 331) up and down, and the slider unit (309, 311, 315, 331) includes a posture regulator (331) for regulating a posture of the print head (200) with respect to the guide rails (301) against rotational force due to weight of the print head (200). <IMAGE> |
