| 摘要 |
<p>The present invention relates to an automatic sheet feeding device of a printer. A pickup roller (1) picks up a record sheet from a sheet feeding plate in response to forward rotation of a driving gear (2). A first rotation member (5), during forward rotation of the driving gear, normally rotates with the pickup roller, and includes a first circumferential formation (6). A stopping member (12) is adapted to engage the first circumferential formation to arrest its forward rotation. A second rotation member (7), during forward rotation of the driving gear, normally rotates with the pickup roller, and includes a second circumferential formation (8). Continued forward rotation of the pickup roller and the second rotation member once the forward rotation of the first rotation member has been arrested by the stopping member causes the second circumferential formation to release the stopping member from the first circumferential formation, thus allowing the first and second rotation members and the pickup roller to continue their rotation in the forward direction. A mechanism is provided to prevent the pickup roller from rotating in reverse when the driving gear is rotated in reverse. <IMAGE></p> |
