Misfeed detector for multi tray sheet feeders
First Claim
1. In a sheet transport system comprising:
- a. a first support tray for supporting a stack of sheets,b. a second support tray for supporting a stack of sheets,c. outlet guide means operably connected to said first and second support trays and located to receive sheets from each of said first and second support trays,d. an outlet sensor at said outlet guide means for sensing the thickness of each sheet passing through said outlet guide means,e. means for storing in memory the thickness value sensed by said outlet sensor of a first sheet discharged from each of said trays and passing through said outlet guide means, ande. means for comparing the thickness value sensed by said oulet sensor of subsequent sheets fed from each tray and passing through said outlet guide means with the thickness value stored in memory of the first sheet fed from the same tray and generating a signal indicating a misfeed if the values differ by a predetermined amount.
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Accused Products
Abstract
The invention relates to an apparatus for detecting sheet misfeed from a multi-tray sheet feeder. The thickness of the first sheet fed from each tray is detected by a common sensor and a thickness value is placed in memory for that tray. Each sheet subsequently fed from the same tray is detected by the common sensor and the thickness value sensed is compared with the thickness value in memory for that tray. If the values match, then only one sheet has been fed from the tray. If the thickness value is more that the thickness value in memory for that tray, then that indicates that more than one sheet has left the tray and the system is shut down to enable an operator to correct the situation. When a tray is reloaded, the thickness value in memory for the sheets previously loaded in the tray is erased and the first sheet fed from the reloaded tray is sensed and a thickness value for that sheet is placed in memory for the reloaded tray.
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Citations
4 Claims
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1. In a sheet transport system comprising:
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a. a first support tray for supporting a stack of sheets, b. a second support tray for supporting a stack of sheets, c. outlet guide means operably connected to said first and second support trays and located to receive sheets from each of said first and second support trays, d. an outlet sensor at said outlet guide means for sensing the thickness of each sheet passing through said outlet guide means, e. means for storing in memory the thickness value sensed by said outlet sensor of a first sheet discharged from each of said trays and passing through said outlet guide means, and e. means for comparing the thickness value sensed by said oulet sensor of subsequent sheets fed from each tray and passing through said outlet guide means with the thickness value stored in memory of the first sheet fed from the same tray and generating a signal indicating a misfeed if the values differ by a predetermined amount. - View Dependent Claims (2, 3, 4)
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Specification