公开(公告)号：US20220314654A1

公开(公告)日：2022-10-06

申请号：US17218900

申请日：2021-03-31

申请人： XEROX CORPORATION

发明人： Chu-Heng LIU ,  Douglas K. HERRMANN ,  Jason M. LeFEVRE ,  Paul J. McCONVILLE ,  Seemit PRAHARAJ

IPC分类号： B41J11/00

摘要： A printing system comprises a printhead to eject a print fluid to a deposition region. A movable support surface, such as a belt, is used to transport print media through the deposition region, with the print media being held against the movable support surface by vacuum suction through holes in the movable support surface. A media registration device loads print media onto the movable support surface and registers the print media to a location of the movable support surface. The movable support surface comprises no-suction-regions in which the vacuum suction through the movable support surface is prevented. The no-suction regions extend across the width of the movable support surface in a cross-process direction and are arranged at predetermined intervals along the process direction. The control system causes the media registration device to register each of the print media relative to a respective one of the no-suction-regions.

公开(公告)号：US20220314652A1

公开(公告)日：2022-10-06

申请号：US17218873

申请日：2021-03-31

申请人： XEROX CORPORATION

发明人： Douglas K. HERRMANN ,  Jason M. LeFEVRE ,  Chu-Heng LIU ,  Paul J. McCONVILLE ,  Seemit PRAHARAJ

IPC分类号： B41J11/00

摘要： A printing system comprises a printhead to eject a print fluid to a deposition region. Print media are held by vacuum suction against a movable support surface, which moves over a vacuum platen to transport the print media through the deposition region. The vacuum platen has platen holes through which the vacuum suction is communicated. Multiple vacuum plenums are provided to supply the vacuum suction to different groups of the platen hoes. A first vacuum plenum is fluidically coupled to a first group of the platen holes located at least partially in the deposition region, and to a second group of platen holes located upstream of the first group. A second vacuum plenum is fluidically coupled to a third group of the platen holes comprising at least some platen holes located between the first and second groups of platen holes.

公开(公告)号：US20220203749A1

公开(公告)日：2022-06-30

申请号：US17137516

申请日：2020-12-30

申请人： Xerox Corporation

发明人： Douglas K. HERRMANN ,  Chu-heng LIU ,  Seemit PRAHARAJ ,  Paul J. MCCONVILLE ,  Jason M. LEFEVRE ,  Michael J. LEVY

IPC分类号： B41N3/08 ,  B41F33/00 ,  B41F7/24

摘要： According to aspects of the embodiments, there is provided a method of measuring the amount of fountain solution employed in a digital offset lithography printing system. Fountain solution thickness is measured using a glass roll at a lower temperature than the fountain solution. The lower temperature causes the fountain solution to undergo a change in state and in a solid state the fountain solution crystalizes and changes roll opacity with the thickness of the film. When radiated with a light source the opacity is continuously measured through the surface of the roller. The thickness of the crystallized fountain solution can then be determined via the opacity level increase by the crystallization and the impact to the opacity on the glass roll.

公开(公告)号：US20220203671A1

公开(公告)日：2022-06-30

申请号：US17137626

申请日：2020-12-30

申请人： Xerox Corporation

发明人： Paul J. McCONVILLE ,  Chu-heng LIU ,  Jason M. LeFEVRE ,  Seemit PRAHARAJ ,  Douglas K. HERRMANN

IPC分类号： B41F31/02 ,  B41F7/20

摘要： According to aspects of the embodiments, there is provided a method of measuring the amount of fountain solution employed in a digital offset lithography printing system. Fountain solution thickness is measured by using phase shifted monochromic light to produce optical path differences through the fountain solution film. The intensity of the reflected light through the fountain solution film is very sensitive due to the phase shifted light so interference fringes are easier to delineate and fountain solution thickness measurement more reliable.