Browse Prior Art Database

Precision Cutting of Fan-Folded Paper

IP.com Disclosure Number: IPCOM000106387D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 4 page(s) / 93K

Publishing Venue

IBM

Related People

Bruder, G: AUTHOR [+4]

Abstract

Disclosed is an algorithm/device to place the cutting position of fan-folded continuous form direct at the fold. Continuous forms have a black paper mark on each document for the synchronization between print pattern and pre-print. In addition this paper mark is used to determine the right cutting position to cut the form into single documents.

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This is the abbreviated version, containing approximately 52% of the total text.

Precision Cutting of Fan-Folded Paper

      Disclosed is an algorithm/device to place the cutting position
of fan-folded continuous form direct at the fold.  Continuous forms
have a black paper mark on each document for the synchronization
between print pattern and pre-print.  In addition this paper mark is
used to determine the right cutting position to cut the form into
single documents.

      The cut has to be placed direct on a paper in-fold or out-fold
to avoid ugly looking "overhang" on the leading or trailing edge of a
document as shown on Figs. 1A and 1B.  The purpose of this disclosure
is to avoid this "overhang".

      The position of the paper mark, relative to the fold is not
constant because the manufacturing processes for printing and folding
are different and independent  from each other.  A precise
synchronization of the two processes could reduce this variation,
however it would increase the paper manufacturing cost significantly.

      A further purpose of this disclosure is to dynamically adjust
the position of the cutting wheel, position to the actual distance
between paper mark and fold.  This synchronization allows cutting on
the fold, even when imprecise continuous form is used.

      Fig. 1 shows a typical application in a printer with the paper
path, print head, cutting wheel and a bundling unit to collect the
documents after cutting and before issuing to the costumer.  For the
adaptive and dynamic synchronization, the optical paper sensors S1
and S2 in the paper path are the most important items.

      S1 is located prior to the cutting wheel with the ability to
measure the distance (B1) paper mark to paper mark of the continuous
form.  Based on this value, the theoretical numbers A1 and C1 can be
calculated  by the internal micro-controller.  For reference see Fig.
2.

      S2 is located behind the cutting wheel and measures the actual
distances A2, B2 and C2 of the document after the cutting process.
For reference see Figs. 3A and 3B.

      This information...