| 摘要 |
PROBLEM TO BE SOLVED: To easily regulate a gap without needing a skilled technique by providing a worm gear for simultaneously driving a pair of worm wheels engaged with adjusting screws by engaging and rotating the wheels engaged with the screws. SOLUTION: When a driving motor 63 is driven to rotate a driving gear 65, a worm shaft 57 is rotated with a driven gear 61. Then, a worm wheel 53 is rotated with a worm gear 59 of the shaft 57. The wheel 53 is rotated to axially move an adjusting screw 49 to the wheel 53 so that a distance between the sheet 53 and a nut 51 is changed. A shaft 43 brought into contact with the wheel 53 is moved in association with the change of the distance, and a doctor roller 41 is moved parallel to an approaching or separating direction of a squeegee roller 31.
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