| 摘要 |
<p>Apparatus for individually feeding sheets in which a friction feed roller positively driven in the direction of feed opposes a friction retarding roller biased in the reverse direction with a predetermined torque and urged against the feed roller with a predetermined force. The reverse bias torque is regulated by means of a spring and a controllable clutch which is disengaged in response to a predetermined strain in the spring. The spring and controllable clutch may comprise a helical spring clutch. In another aspect of the disclosure, the retarding roller is carried by an arm for rotation about a pivot center located such that the normal force urging the two rollers together is automatically suitably adjusted in response to changes in the biasing torque.</p> |
