Browse Prior Art Database

Detection of Multi-Paper Pages

IP.com Disclosure Number: IPCOM000041880D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Beebe, HM: AUTHOR [+2]

Abstract

A technique for eliminating paper jams and output blank pages caused by a multiple paper feed in a cut sheet printer/copier. One of the failure modes of a cut sheet printer/copier is in the erroneous feeding of more than one sheet of paper to the process. When this occurs, either the sheets separate in the system causing a paper jam or they stick together throughout the process causing blank pages in the output text. A method is described in connection with Fig. 1 whereby a multiple paper feed is recognized and the controller is notified, thus maintaining the probity of the machine. Generally, a circuit illustrated in Fig. 3 senses the increase in infrared opacity posed by multiple sheets in reference to singular sheets. Upon card reset, the LED (light-emitting diode) current starts at zero, as shown in Fig.

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Detection of Multi-Paper Pages

A technique for eliminating paper jams and output blank pages caused by a multiple paper feed in a cut sheet printer/copier. One of the failure modes of a cut sheet printer/copier is in the erroneous feeding of more than one sheet of paper to the process. When this occurs, either the sheets separate in the system causing a paper jam or they stick together throughout the process causing blank pages in the output text. A method is described in connection with Fig. 1 whereby a multiple paper feed is recognized and the controller is notified, thus maintaining the probity of the machine. Generally, a circuit illustrated in Fig. 3 senses the increase in infrared opacity posed by multiple sheets in reference to singular sheets. Upon card reset, the LED (light-emitting diode) current starts at zero, as shown in Fig. 2, and ramps up until the photosensor turns on. When the first page arrives in the sensor gap, the photosensor turns off again, enabling the ramp circuit to increase LED current until this first page is invisible to the sensor. Once this point is reached, the photosensor turns on and the LED current is latched. Now, only multiple sheets in the sensor gap will be visible to the sensor, and the circuit will post an error and wait to be reset. The system is believed to be unique in that it uses infrared transmittance to sense multiple paper feeds, and automatically recalibrates on first page after every reset.

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