Browse Prior Art Database

DOCUMENT REGISTRATION CONTROL ALGORITHM

IP.com Disclosure Number: IPCOM000026203D
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 103K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a reprographic system, reproduction of a document requires that the original be mechanically placed (Registered) within a capture window. Any error in placing the original will show up as the same error on the output copy. Faithful reproduction, therefore, requires accurate placement of the original within a specified capture window.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

DOCUMENT REGISTRATION Proposed Classification CONTROL ALGORITHM U.S. C1.355/317 Kenneth J. Buck Int. C1. G03g 21/00

XEROX DISCLOSURE JOURNAL Vol. 15 No. 5 SeptembedOctober 1990 353

[This page contains 1 picture or other non-text object]

Page 2 of 2

DOCUMENT REGISTRATION CONTROL ALGORITHM(Cont'd)

In a reprographic system, reproduction of a document requires that the original be mechanically placed (Registered) within a capture window. Any error in placing the original will show up as the same error on the output copy. Faithful reproduction, therefore, requires accurate placement of the original within a specified capture window.

The figure shows a Universal Document Handler (UDH) drive system 10. Motion is created by drive motor 12 and is monitored by optical motor encoder 14 mounted on the shaft of drive motor 12. Motion is transmitted through timing belts 16, 18 to speed reduction pulley 20 and to document drive transport 22. As the document is fed onto platen 24, it passes through optical registration sensor 26 where the trail edge is detected. The document then travels a machine specific distance of "K encoder counts until it begins to decelerate to a stop.

Typically, as the trail edge of a document passes through registration sensor 26, it is traveling at a rate of speed such that if power is removed from motor 12, the trail edge will coast past the registration location. As such, motor braking will need to be applied to stop the document on time. However, motor braking changes the dynamic equilibrium that exists betwee...