Control system for test patch area exposure in a printing machine

US6204869A · kind A · utility

Assignee

• Xerox Corporation · US

Inventors

• Cathleen J. Raker · Rochester, US
• Sue K. Lam-Chon · Rochester, US
• Patrick Waller · Stintenberger Straße, CH
• Daniel Rudolf Maurer · Mountain View, US
• Joseph W. Ward · Pittsford, US
• Rosario A. Bracco · Webster, US
• Ronald E. Shaul · New York, US
• Robert M. Mara · Fairport, US
• Raymond L. Mongeon · Rochester, US
• Joseph A. Mastrandrea · Webster, US
• Patricia A. Papaleo · Rochester, US
• Colleen Tremaine · Pittsford, US

Key dates

• Filing date: Dec 21, 1998
• Grant date: Mar 20, 2001
• Expiry date: Dec 21, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/00054
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

There is provided a method for use with a printing machine having a movable imaging member and a projecting system for modulating a beam and projecting an image into the movable imaging member. The printing machine further includes a developer for application of developer material to the image projected onto the movable imaging member for transfer of the image to a print media sheet. The method, which is intended for use in controlling exposure of a test patch on the movable imaging member includes the steps of: a) providing a time-keeping device with the time-keeping device including a variable value which is either incrementable or decrementable; b) detecting a signal indicating that the movable imaging member is positioned relative to the beam in a selected orientation, wherein the movable imaging member passes by the beam at a selected speed; c) providing a reference value with the reference value varying as a function of the selected speed; d) in response to the detecting of (b), modulating the beam, relative to the movable imaging member, so as to expose a portion for the test patch; e) concurrent with the modulating of (d), incrementing or decrementing the variable value of …