公开(公告)号：BR9902379A

公开(公告)日：2000-01-18

申请号：BR9902379

申请日：1999-05-03

Applicant: XEROX CORP

Inventor： RAKER CATHLEEN J ,  LAM-CHON SUE K ,  WALLER PATRICK O ,  MAURER DANIEL R ,  WARD JOSEPH W ,  BRACCO ROSARIO A ,  SHAUL RONALD E ,  MARA ROBERT M ,  MONGEON RAYMOND L ,  MASTRANDREA JOSEPH A ,  PAPALEO PATRICIA A ,  TREMAINE COLLEEN

IPC: G03G15/00 ,  G03G21/00

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 the time keeping device; and f) repeating said modulating of (d) until the value of the variable value is about equal to the reference value and the test patch is exposed.