| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sheet feeding device that suppresses the speed of a rising and lowering plate from rising and that has higher feed stability and lower noise level even in a high speed operation, for example, by providing an idle zone between a feed roller and a feed cam, and to provide an image forming apparatus. <P>SOLUTION: At a start of sheet feeding operation, the feed cam 21 starts to rotate in conjunction with the rotation of a feed shaft 24 and a feed roller starts to rotate from a time when the feed shaft has passed the idle zone Ar so as to send out each of the sheets on a rising and lowering plate 22. Subsequently, the feed roller 2 is returned to a feed initial position by a return mechanism including a conveyance roller 2, feed rotatable members 3a, 3b, a feed rolling device 30 or the like. Thus, a cam curve of the feed cam 21 reduces a rising speed as compared to the rising speed of a conventional rising and lowering plate 22, and reduces the generation of noise at the time of a collision between the sheets S on the rising and lowering plate 22 and the feed rolling device 30. Accordingly, the image forming apparatus lower in noise level can be provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
