| 摘要 |
<p>An electrostatic copying apparatus capable of both-surface copying comprises a main copying system and a document sending device for conveying a document to be copied through an exposure area, said main copying system including copying paper conveying means defining a copying paper conveying passage, image forming means for forming an image on copying paper conveyed through the paper conveying passage, copying paper returning means defining a copying paper returning passage for returning copying paper having the image formed on one surface and paper re-feed means for receiving the copying paper returned through the paper returning passage and feeding it again to the paper conveying passage. According to a first aspect, improvement is made in the paper re-feed means, and according to a second aspect, document feed means in the document sending device is improved. There is also provided a sheet material feeding device which can be conveniently applied to the paper re-feed means or the document feed means. The sheet material feeding device comprises a first feed means for feeding sheet materials in the stacked state from the uppermost one and a second feed means for feeding the sheet materials from the lowermost one.</p> |
