| 摘要 |
<p>An apparatus which determines the location of an edge of an advancing sheet and discriminates between the edge and a hole in the sheet. After the leading edge of the sheet is detected by a sensor (108) and the sheet has moved a first predetermined distance, the absence or presence of the sheet is sensed for a second predetermined distance. If the sheet is not detected as it moves the second predetermined distance, the control logic (114) indicates that the trailing edge has been detected. In the event the sheet is sensed, the control logic indicates that a hole has been detected and the process is repeated to locate the trailing edge.</p> |
