| 摘要 |
<p>Apparatus for individually feeding sheets in which a friction feed roller 98 positively driven in the direction of feed co-operates with a second friction roller 112 which is urged against the feed roller, e.g. by springs 130, and is provided with a torque biasing it in the reverse direction. The reverse bias torque is regulated, for example by means of a helical spring and a controllable clutch which is disengaged in response to a predetermined strain in the spring, and the normal force urging the two rollers together is automatically suitably adjusted in response to changes in the biasing torque. The effectiveness of the assembly in preventing double sheet feed is improved by this coupled response to changes in the biasing torque. <IMAGE></p> |
