Method and apparatus for web tracking with predictive control

Details Method and apparatus for web tracking with predictive control Method and apparatus for web tracking with predictive control

1988-12-27

1990-10-02

Moses, R. L.

Photocopying

Contact printing

Light boxes

355212, 355326, 226 21, G03G 2100, B23Q 1500

Patent

active

049610899

ABSTRACT:
Web tracking apparatus and methods are disclosed having particular utility in electrostatographic reproduction apparatus. A web includes a plurality of image frames allowing images to be written thereon and transferred therefrom to a receiver. A guide means moves such web along a path and includes a steering roller mounted for rotation about a caster axis and a gimbal axis. A web tracking system for controlling the guide means to effect lateral alignment of said web is provided such that the deviation of corresponding points of transferred images is minimized. Degradation of image registration due to mid-print corrections is eliminated and steering corrections are made less frequent by the use of adaptive and predictive algorithms. The writing and transfer of images is thereby accomplished in accurate registration and is particularly well-suited for use in forming accurate multicolor reproduction of superimposed images.

REFERENCES:
patent: 3181418 (1965-05-01), Durlofsky
patent: 3570735 (1971-03-01), Kurz
patent: 4429985 (1984-02-01), Yokota
patent: 4462676 (1984-07-01), Shimura et al.
patent: 4483607 (1984-11-01), Nagayama
patent: 4572417 (1986-02-01), Joseph et al.
Patent Abstracts of Japan, abstract to Unexamined Application 63-50874 of 3/3/84 by Chiaki Daito.

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