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Browse Prior Art Database

Document Feeder Exit Control

IP.com Disclosure Number: IPCOM000052678D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 3 page(s) / 119K

Publishing Venue

IBM

Related People

Battista, PR: AUTHOR [+2]

Abstract

Often the feeding of documents from a processing station is hindered by forces tending to hold the document in place. These forces can be overcome by moving the exit gate back into position after the initial feed of the document, to provide a normal force against the document, holding the document in contact with the feed mechanism.

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Document Feeder Exit Control

Often the feeding of documents from a processing station is hindered by forces tending to hold the document in place. These forces can be overcome by moving the exit gate back into position after the initial feed of the document, to provide a normal force against the document, holding the document in contact with the feed mechanism.

A document 10 (Fig. 1A) is held at a processing station, such as the document glass 11 of a copier by a gate 12. After the gate is dropped (Fig. 1B), the document normally is moved a small amount when a feed mechanism 14 begins its movement. Often, however, forces such as those generated by static electricity tend to hold the document against movement, stopping it shortly after movement begins.

A sensor 15 and sensor reflection plate 16 are provided to sense the presence or absence of the document at a substantial distance X from the gate
12. The distance X is selected to be beyond the initial movement of the documents when slippage is occurring. Thus, if the forces holding the document cause it to slip on the feed mechanism 14, sensor 15 will detect that the document has slowed or stopped and is not being properly fed (step 12 in Fig.
2).

Upon the detection ("NO" in Fig. 2), the exit gate 12 is restored after a specified time (step 15 in Fig. 2). The specified time is selected to give the document feeder 14 the opportunity to move the leading edge of the document beyond gate 12.

Gate 12 is made of a plast...