Browse Prior Art Database

Self Adjusting Document Feed Skew Correcting Device

IP.com Disclosure Number: IPCOM000108678D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 108K

Publishing Venue

IBM

Related People

Young, SL: AUTHOR

Abstract

Disclosed is a document-feed-skew-correcting device. The device automatically restrains the left or right leading end of a feeding document until the trailing left or right end reaches the same point in the feed path. The document, once aligned (skew corrected), is then automatically released to resume transport. The disclosed device is self-adjusting to compensate for wear on the friction surface of the rubber-restraint rollers as well as changes in the operating environment that cause the rubber of the rollers to expand or contract.

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Self Adjusting Document Feed Skew Correcting Device

       Disclosed is a document-feed-skew-correcting device. The
device automatically restrains the left or right leading end of a
feeding document until the trailing left or right end reaches the
same point in the feed path.  The document, once aligned (skew
corrected), is then automatically released to resume transport.  The
disclosed device is self-adjusting to compensate for wear on the
friction surface of the rubber-restraint rollers as well as changes
in the operating environment that cause the rubber of the rollers to
expand or contract.

      Referring to Figs. 1 and 2, the device consists of a
feedroller/counter-rotating roller (CRR) pinchpoint through which all
documents pass.  The CRR 1 is split into two separate CRRs (a left
and a right) with each CRR rotating at the same rate of speed.  The
feedroller 2 drives the document through the pinchpoint and then past
two camlevers 3 (a left and a right) which have an interference
engagement with the feed roller.  The document actuates each camlever
as it passes between the camlever and the feedroller, resulting in an
increase in pressure of the adjacent CRR which is riding against
free-turning idlers 4 mounted in the gaps of the tires of the
feedroller.  The resulting increase in pressure of the CRR is such
that the restraint force exceeds the feed force, causing the affected
end of the document to move backward through the document path. The
opposite end of the document continues to feed forward until the
document is aligned. ...