Browse Prior Art Database

Inter Sheet Gap Sensor Configuration

IP.com Disclosure Number: IPCOM000088782D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Abbott, PE: AUTHOR [+2]

Abstract

In a sheet feeding system, the inter-sheet gap, or the absence or presence of a sheet is sensed for all known sheet types, e.g., bond paper, transparencies, or black paper (masters).

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Inter Sheet Gap Sensor Configuration

In a sheet feeding system, the inter-sheet gap, or the absence or presence of a sheet is sensed for all known sheet types, e.g., bond paper, transparencies, or black paper (masters).

Referring first to the figure, the depicted sensor configuration accomplishes the foregoing. It comprises a first phototransistor 10 disposed above a sheet 12 movable in a sheet path 14, a second phototransistor 16 disposed below the aforementioned sheet path, and a light-emitting diode 18 disposed below sheet path 14 and adjacent to phototransistor 16.

Referring now to the table which typifies sensor activation with different types of sheets, the inter-sheet gap or the absence of a sheet condition is indicated only when phototransistor 10 is on and transistor 16 is off. As shown, any other combination of sensor conditions indicates the presence of a sheet.

The sensor configuration described has many practical applications. For example, in a copier/duplicator environment, the sensor conditions can be used with associated electronics (not shown) to shut down operation in sheet-feeding malfunction situations, such as jamming (overlapping of sheets) and misfeeding (absence of a sheet).

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