Browse Prior Art Database

Skew Measurement

IP.com Disclosure Number: IPCOM000113134D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Marschlich, K: AUTHOR [+2]

Abstract

In this disclosure, a line camera is used to measure documents and reports in the paper path. This camera recognizes the direction of the retracted document.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 57% of the total text.

Skew Measurement

      In this disclosure, a line camera is used to measure documents
and reports in the paper path.  This camera recognizes the direction
of the retracted document.

      How to Use it - You can use this skew measurement everywhere,
where documents or reports with a defined orientation, and a very
high accuracy have to be transported, like scanner, printer etc..
This tools allows you to control/verify the quality of the transport
in dependency to the time parameter.  This project requires a very
high accuracy in the paper path.  To support this high requirement we
need a quality tool, which is able to control the accuracy of 0.5
percent.

      Current Technical Level - At the moment the skew measurement is
performed with two optical sensors.  The values of these sensors will
be compared.  The compared value gives you the angle of the inserted
document in dependency to the time parameter.  This accuracy method
is not very precise, according to the electronic optical sensors.
This method doesn't reach the required accuracy.  Another
disadvantage of this this process is, that no direct selection of the
measurement points the measurement points is possible.  This direct
selection is necessary to use different lengths of documents

      Development Thought - The used line camera has 2700 points on a
226mm paper width, that means 2700 sensors.  The resolving of the
camera is 3 ms.  That allows a direct selection of your measurement
po...