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Browse Prior Art Database

Skew Correction Technique

IP.com Disclosure Number: IPCOM000103168D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Barker, RB: AUTHOR

Abstract

Documents inserted into a paper handling device are often skewed when proper alignment depends upon the care of the operator. This technique reduces the amount of skew for documents inserted from the top.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Skew Correction Technique

      Documents inserted into a paper handling device are often
skewed when proper alignment depends upon the care of the operator.
This technique reduces the amount of skew for documents inserted from
the top.

      As shown in the drawing, a carelessly inserted document 1 is
placed in the device until it contacts feed roller 2, but not feed
roller 3, on the feed roll shaft 4 as shown in Step A.  This skewed
document is subsequently fed downward as shown to position 5 where
both feed rollers 2 and 3 are now in holding the document.

      In Step B, the direction of the feed rollers is reversed,
driving the skewed document from position 5 to position 6 where the
right lower edge of the document stops at the nip point of the right
feed roller 3.  As the weight of the document holds the right lower
edge on the right feed roller, the left feed roller 2 continues to
drive the document upward, creating a rotation that de-skews the
document at position 7.  Finally, the de-skewed document is fed
downward under machine control.

      Disclosed anonymously.