Browse Prior Art Database

Paper Overflow Detector

IP.com Disclosure Number: IPCOM000074632D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Casale, WR: AUTHOR [+3]

Abstract

A paper overflow detector for a line printer utilizes a light-emitting diode 10 and a phototransistor 12 mounted at an angle to each other adjacent the upper end of a tractor 14 feeding a paper form 16, as shown in Fig. 1. With the form 16 in its normal path no light from the diode reaches the phototransistor. When an overflow condition occurs, the form being fed by the tractor tends to buckle, as shown by the dotted outline in Fig. 2. In this path, light from the diode is reflected from the form to the phototransistor. The output from the phototransistor is used to provide a Stop signal for the printer.

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Paper Overflow Detector

A paper overflow detector for a line printer utilizes a light-emitting diode 10 and a phototransistor 12 mounted at an angle to each other adjacent the upper end of a tractor 14 feeding a paper form 16, as shown in Fig. 1. With the form 16 in its normal path no light from the diode reaches the phototransistor. When an overflow condition occurs, the form being fed by the tractor tends to buckle, as shown by the dotted outline in Fig. 2. In this path, light from the diode is reflected from the form to the phototransistor. The output from the phototransistor is used to provide a Stop signal for the printer.

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