| 摘要 |
A sensor senses the height of a stack of sheets in a magazine. The sensed height is scaled according to the thickness of individual sheets to determine the number of sheets available. At the start of a run of, for example, a copying machine, the number of sheets available is compared to the number of sheets required to complete the run and, if the number available is insufficient, an indication of this fact is given to the operator and an inhibit device may prevent operation of the copying machine. In one embodiment, a counter causes a sampling circuit to determine and display the number of sheets available at predetermined intervals, preferably at the beginning and end of each run.
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