| 摘要 |
A method and apparatus for shredding sheets (5) comprises a sheet feed system (4) for feeding sheets to a shredding station (6). A detector (24) senses each sheet fed to the shredding station (6) and causes a predetermined single sheet value to be arithmetically summed with a running count. The noise generated at the shredding station is monitored by one or two microphones (15, 16) and when the noise level exceeds a threshold indicating that the shredding of sheets is taking place, the running count is decremented at a predetermined rate. An error signal is generated if the running count exceeds a predetermined threshold. This condition will occur if the sheet feed rate to the shredder exceeds a rate at which the shredder can efficiently operate. <IMAGE> |
