| 摘要 |
<p>An electrostatic copying apparatus comprising a copying paper transfer unit (46) which includes a paper feed mechanism (54) comprising a cassette receiving section (48) formed at one end portion of a housing (2) of the apparatus for detachably receiving a box-like copying paper cassette (50). The cassette (50) has an opening in its top surface and carries a stack of copying paper sheets of a predetermined uniform size. The cassette receiving section (48) having a paper feed roller (52) which is mounted rotatably in the upper portion of the cassette receiving section (48). In normal use, with the cassette (50) mounted in the cassette-receiving section (48), the feed roller (52) comes into engagement with the topmost copying paper sheet of the stack in the cassette (50) through the opening in the to surface of the cassette. When the feed roller (52) is driven, it feeds the paper sheets one by one from the cassette (50). The apparatus further includes a mechanism which, when the cassette (50) has been detached from the apparatus, can be fitted in place of the cassette (50) in the cassette-receiving (48) for enabling an arbitrary-sized copying sheet to be positioned manually with respect to the feed roller (52) so that the latter sheet is fed by the feed roller (52). The latter mechanism comprises a frame (252) capable of being detachably mounted in the cassette-receiving section (48) and having a guide top surface (254) containing openings (258) through which rollers (262) protrude. When the frame is mounted in the cassett-receiving section (48) in place of the cassette (50), the upper portion of the peripheral surface of the rollers (262) come into engagement with the paper feed roller (52) whereby, when a copying paper sheet is advanced manually over the guide top surface (254) of the frame, its leading end is nipped between the paper feed roller (52) and the roller (262).</p> |
