Xerox Corporation

Chetan Keny

Peter John Knausdorf

Henry Thomas Bober

Steven Robert Moore

This invention generally relates to accurately measuring image geometries in-line within a printing system. One or more two-dimensional array sensors may be located adjacent to a sheet of media printed with a predefined array of indicia marks so that the sensor field of view is contained within the plane of sheet transport. As the sheet is transported by the sensor, the sensors continuously record the locations of the indicia marks within its field of view. The spatial frequency of the indicia marks is arranged so that at least two indicia marks are within the field of view of the sensor at any instant for each of the process and cross-process directions. The two-dimensional array sensor can thus measure the absolute spacing between adjacent local indicia marks within the precision of the sensor construction. The cumulative spacing along each direction may then calculated to determine the overall dimensions of the indicia marks array. A measurement procedure is also provided to accurately measure image geometries, even in the presence of significant sheet velocity variations.

In-line image geometrics measurement via local sampling on sheets in a printing system

A flexible strip of low coefficient of friction material is attached to a paddle wheel hub and placed over a predetermined length of the drive side of the paddle wheel blades in order to reduce the drive force of the paddle wheel blades on the top sheet in a stack to thereby allow the accurate compiling of a greater range of curled sheets.

Finisher apparatus

This is a compiler tray with a Velcro&#xae; surfaced back guide enabled to be used with Birds Beak Edge Curl Suppressors to minimize up curl and down curl of sheets fed into the tray and improve Stapled Set Registration. The Velcro&#xae; is either fixed to the back guide or adjustably positioned on the back guide. The Velcro&#xae; is placed on the back guide in such a manner that the ribs and grooves of the Velcro&#xae; are at an angle significantly not parallel to the plane of the lead edge of paper sheets fed into the compiling tray.

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Webster, NY, United States of America

Chetan Keny