公开(公告)号：CA2485764A1

公开(公告)日：2005-04-29

申请号：CA2485764

申请日：2004-10-22

Applicant: XEROX CORP

Inventor： MASTRANDREA JOSEPH A ,  LECLERC GERALD SCOTT ,  HIRSCH MARK J ,  MCCONVILLE PAUL J ,  GROSS ERIC M

IPC: G03G15/06 ,  G03G15/08 ,  G03G21/00

Abstract: An apparatus for developing a latent image recorded on a movable imaging surface, including: a reservoir for storing a supply of developer material including toner particles, said reservoir including a transport member; a donor member being arranged to receive toner particles from said transport member and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon; a power supply, connected to said donor member, for biasing said donor member to deliver toner to the image surface during a printing mode of operation; a second power supply, connected to the transport member, for maintaining a predefined voltage difference between the transport member and the donor member such that toner particles are attracted to the donor member from the transport member during a printing mo de of operation; a controller for generating a donor member purge signal trigger based on sensed or calculated development conditions; and a power supply controller, responsive to said donor member purge signal, for changing the voltage between the dono r member and the transport member during a second mode of operation thereby causing toner to partially or completely transfer back to said transport member and optionall y transported to the imaging surface.

公开(公告)号：CA2485764C

公开(公告)日：2009-07-07

申请号：CA2485764

申请日：2004-10-22

Applicant: XEROX CORP

Inventor： LECLERC GERALD SCOTT ,  MASTRANDREA JOSEPH A ,  GROSS ERIC M ,  HIRSCH MARK J ,  MCCONVILLE PAUL J

IPC: G03G21/00 ,  G03G15/06 ,  G03G15/08

Abstract: An apparatus for developing a latent image recorded on a movable imaging surface, including: a reservoir for storing a supply of developer material including toner particles, said reservoir including a transport member; a donor member being arranged to receive toner particles from said transport member and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon; a power supply, connected to said donor member, for biasing said donor member to deliver toner to the image surface during a printing mode of operation; a second power supply, connected to the transport member, for maintaining a predefined voltage difference between the transport member and the donor member such that toner particles are attracted to the donor member from the transport member during a printing mo de of operation; a controller for generating a donor member purge signal trigger based on sensed or calculated development conditions; and a power supply controller, responsive to said donor member purge signal, for changing the voltage between the dono r member and the transport member during a second mode of operation thereby causing toner to partially or completely transfer back to said transport member and optionall y transported to the imaging surface.

公开(公告)号：BRPI0404717A

公开(公告)日：2005-06-21

申请号：BRPI0404717

申请日：2004-10-28

Applicant: XEROX CORP

Inventor： GROSS ERIC M ,  MCCONVILLE PAUL J ,  LECLERC GERALD SCOTT ,  MASTRANDREA JOSEPH A ,  HIRSCH MARK J

IPC: G03G15/06 ,  G03G15/08 ,  G03G15/09

Abstract: An apparatus for developing a latent image recorded on a movable imaging surface, including: a reservoir for storing a supply of developer material including toner particles, said reservoir including a transport member; a donor member being arranged to receive toner particles from said transport member and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon; a power supply, connected to said donor member, for biasing said donor member to deliver toner to the image surface during a printing mode of operation; a second power supply, connected to the transport member, for maintaining a predefined voltage difference between the transport member and the donor member such that toner particles are attracted to the donor member from the transport member during a printing mode of operation; a controller for generating a donor member purge signal trigger based on sensed or calculated development conditions; and a power supply controller, responsive to said donor member purge signal, for changing the voltage between the donor member and the transport member during a second mode of operation thereby causing toner to partially or completely transfer back to said transport member and optionally transported to the imaging surface.

公开(公告)号：JP2005134898A

公开(公告)日：2005-05-26

申请号：JP2004307766

申请日：2004-10-22

Applicant: Xerox Corp ,  ゼロックス コーポレイションXerox Corporation

Inventor： GROSS ERIC M ,  MCCONVILLE PAUL J ,  LECLERC GERALD SCOTT ,  MASTRANDREA JOSEPH A ,  HIRSCH MARK J

IPC: G03G15/06 ,  G03G15/08

CPC classification number: G03G15/065

Abstract: PROBLEM TO BE SOLVED: To maintain print quality in a zerograph development system by employing a reverse bias doner roller cleaning cycle. SOLUTION: The developing device includes: a reservoir which contains a conveying member 170; donor members 176 and 178 which are spaced from each other in the direction of the movement of an image forming face 10 and supply toner particles to the image forming face, thereby developing latent images on the image forming face; a power source 515 which applies a bias to the donor members so that the toner is supplied to the image forming face for a period of a printing operation mode; a second power source 525 which maintains a predetermined voltage difference between the conveying member and the donor members so that the toner particles are attracted to the donor members from the conveying member during the period of the printing operation mode; a controller 520 which generates a trigger for a donor member purge signal based upon a detected or calculated developed state; and a power source controller 520 which varies a voltage between the donor members and the conveying member in response to the donor member purge signal, reversely transfers toner particles onto the conveying member partly or completely, and allows the image forming face to convey the toner particles when needed. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：通过采用反向偏压给辊清洁循环来保持零位显影系统中的打印质量。 解决方案：显影装置包括：容纳有输送构件170的储存器; 供体构件176和178，它们在图像形成面10的移动方向上彼此间隔开，并将调色剂颗粒供应到图像形成面，从而在图像形成面上显影潜像; 电源515，其向供体构件施加偏压，使得调色剂在打印操作模式的时段期间被供应到图像形成面; 第二电源525，其在输送构件和供体构件之间保持预定的电压差，使得在打印操作模式期间调色剂颗粒从传送构件被吸引到施主构件; 控制器520，其基于检测或计算的显影状态产生供体成员清洗信号的触发; 以及电源控制器520，其响应于施主构件清洗信号改变施主构件和输送构件之间的电压，将调色剂颗粒部分地或完全地转印到输送构件上，并允许成像面传送调色剂颗粒 需要的时候。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JP2002333775A

公开(公告)日：2002-11-22

申请号：JP2002117336

申请日：2002-04-19

Applicant: XEROX CORP

Inventor： LECLERC GERALD SCOTT ,  MAIER RICHARD M

IPC: G03G15/06 ,  G03G15/08 ,  G03G15/095

Abstract: PROBLEM TO BE SOLVED: To provide a developing device with improved edge enhancement of a developed image. SOLUTION: The hybrid jumping developing device 34 is equipped with a toner supply source 42, a donor roll 36 spaced from a charge retentive surface and feeding toner to an area near to the charge retentive surface from the supply source 42, a device 114 producing in the vicinity of the charge retentive surface a toner cloud for developing an electrostatic latent image on the charge retentive surface by applying an alternating current directly to the roll 36 and generating alternating electrostatic field, and an edge enhancement scavenging (sweeping) device 200 existing near the roll 36 and redistributing the toner on the developed electrostatic latent image. The device 200 generates electrostatic field between the developed latent image and the device 200 and scavenges the toner from the developed latent image so as to improve the edge enhancement of the image.