Sheet feeding or delivering – Delivering to stack and feeding therefrom – Intermediate tray
Patent
1995-02-13
1996-04-02
Skaggs, H. Grant
Sheet feeding or delivering
Delivering to stack and feeding therefrom
Intermediate tray
271 313, 271 901, 271 905, 271 913, 271263, B65H 522
Patent
active
055033822
ABSTRACT:
The thickness of a first sheet fed from each tray of the multi-tray sheet feeder is detected by a first sensor and a thickness value is placed in memory for that tray. Each sheet subsequently fed from the same tray is detected by the same sensor and the thickness value sensed is placed in memory and compared with the thickness value in memory for that tray. 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. After the thickness value of a sheet is sensed by the first sensor, the sheets enter into the intermediate tray. The thickness value of a sheet is detected by an outlet sensor as it leaves the intermediate sheet tray and that value is compared to the thickness value in memory which was detected for the same sheet by the first sensor. During the comparison steps, if the values match, then only one sheet has passed through a sensor. If the thickness value sensed is more that the thickness value in memory, then that indicates that more than one sheet has passed through the sensor and the system is shut down to enable an operator to correct the situation or the offending sheets can be sent to a purge tray at the printer without shutting down the system.
REFERENCES:
patent: 4536078 (1985-08-01), Ziehm
patent: 4651982 (1987-03-01), Martin
patent: 4881104 (1989-11-01), Kusumoto et al.
patent: 5110114 (1992-05-01), Yamauchi et al.
patent: 5114138 (1992-05-01), Ichinose
patent: 5135114 (1992-08-01), Satake et al.
Barton William D.
Hansen Paul
Johnson Keith
Raizes Sheldon F.
Rumsey Michael D.
Raizes Sheldon
Skaggs H. Grant
Xerox Corporation
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