| 摘要 |
A loading lid is provided with a roll holding mechanism. The roll holding mechanism is constituted of a holder plate, a first position regulate section and a second position regulate section. The holder plate and the loading lid are attached to a same shaft. The holder plate is biased by a spring toward the loading lid. After the printing paper roll is put on the loading lid, it is closed. On closing the loading lid, as it relatively moves to the holder plate, an open angle between the loading lid and the holder plate becomes smaller gradually. When first and second positioning plates and the holder plate contact to a periphery of the paper roll, the loading lid stops relatively moving to the holder plate. Thereafter, the loading lid and the holder plate move together while they keep the open angle in accordance with the largeness of the radius of the paper roll. When the loading lid is perfectly closed, a center of a roll core is set at a predetermined position, regardless of the largeness of the paper roll. The paper roll is rotatably supported by roll supporting shafts.
|
