| 摘要 |
<p>A sheet detector comprises a pair of rollers disposed on opposite sides of a feed path, each roller having a conductive outer portion extending therearound. The conductive portions, which are supported on the roller shafts by electrically insulating, relatively yieldable cores, contact each other to establish an electrical connection in the absence of a sheet therebetween and are separated from each other during the passage of a sheet therebetween to break the connection and thereby indicate the presence of the sheet. Conductive brushes resiliently biased into circumferential grooves formed on the conductive portions couple the portions to an external circuit including a sheet counter and a length counter.</p> |
