Browse Prior Art Database

Short Paper Detection in Paper Path

IP.com Disclosure Number: IPCOM000052556D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Kida, M: AUTHOR

Abstract

This article describes a concept of detecting an erroneous insertion a short or cut paper whose length is shorter than the distance between feed rollers, wherein a counter is provided whose operation is controlled by two sensors.

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Short Paper Detection in Paper Path

This article describes a concept of detecting an erroneous insertion a short or cut paper whose length is shorter than the distance between feed rollers, wherein a counter is provided whose operation is controlled by two sensors.

It is often required to detect paper of a length shorter than the distance C between the feed rollers 1 and 2 in a paper path to prevent a paper jam or a misfeed from occurring. Particularly, such detection is desirable in a scanning station 6 in a facsimile apparatus to which original documents of various length are sequentially supplied by an operator or an automatic document feeding device.

To detect the short paper, the paper sensors 3 and 4 are provided along the paper path. The paper sensor 3 senses the leading edge of the paper, which is supplied in the direction indicated by an arrow 5, and the paper sensor 4 senses the trailing edge of the paper.

A counter (not shown) is provided whose operation is controlled by the sensors 3 and 4. The counter, once started, is incremented in synchronism with the rotation of a stepping motor (not shown) which drives the feed rollers 1 and 2.

At the time the paper sensor 3 senses the leading edge of the short paper, the counter is started and incremented in synchronism with the movement of the paper. At the time the paper sensor 4 senses the trailing edge of the paper, shown by the dotted line, the counter is stopped, the count value in the counter indicating...