公开(公告)号：CA1326055C

公开(公告)日：1994-01-11

申请号：CA595489

申请日：1989-04-03

Applicant: XEROX CORP

Inventor： SCHMIDLIN FRED W

IPC: B41J2/385 ,  B41J2/415 ,  G03G15/05 ,  G03G15/08 ,  G03G15/34 ,  G03G17/00 ,  G03G5/08 ,  B41J2/41

Abstract: Direct electrostatic printing (DEP) is optimized by presenting well charged toner to a charged toner conveyor which conveys the toner to an apertured printhead structure for propulsion therethrough. The charged toner conveyor comprises a plurality of electrodes wherein the electrode density (i.e. over 400 electrodes per inch) is relatively large for enabling a high toner delivery rate without risk of air breakdown. The printhead structure is constructed for minimization of aperture clogging. To this end the thickness of the printhead structure is about 0.025 mm and the aperture diameter (i.e. 0.15 mm) is large compared to the printhead thickness.

公开(公告)号：DE69323133T2

公开(公告)日：1999-06-10

申请号：DE69323133

申请日：1993-08-23

Applicant: XEROX CORP

Inventor： SCHMIDLIN FRED W

IPC: G03G15/01 ,  G03G15/08 ,  G03G21/00 ,  G03G21/10

Abstract: A scavengeless development system in which toner (44) is detached from a donor belt (42) and attracted to latent electrostatic images carried by an image receiver (10) positioned adjacent the belt (42). Generation of a controlled powder cloud of toner particles (44) is effected using AC electric fields created by an AC voltage source (104) and an embedded electrode structure (102) stationarily positioned behind the donor belt (42). Unused toner is removed from the donor belt (42) in a manner - using a conductive cleaning brush (106) connected to a DC bias (108) - which avoids history effects due to accumulation of highly charged, relatively small toner particles (44) on the donor belt.

公开(公告)号：CA2135704C

公开(公告)日：1998-08-04

申请号：CA2135704

申请日：1994-11-14

Applicant: XEROX CORP

Inventor： MARTIN ROBERT G ,  CONNERS EDWARD W ,  SCHMIDLIN FRED W

IPC: G03G21/16 ,  G03G15/08 ,  G03G15/34 ,  G03G15/16

Abstract: Apparatus for creating powder images. An image forming member and a toner delivery system are supported opposite each other. The images are formed by the image forming member along a first direction. The toner delivery system includes a toner transport for moving toner particles from a supply to a zone opposite the image forming member. The transport moves along a second direction which is non-parallel to the first direction.

公开(公告)号：DE69018222T2

公开(公告)日：1995-11-09

申请号：DE69018222

申请日：1990-12-18

Applicant: XEROX CORP

Inventor： SCHMIDLIN FRED W ,  LINDENFELSER WILLIAM M ,  SOTACK JOHN D

IPC: G03G15/05 ,  B41J2/385 ,  B41J2/415

Abstract: Direct electrostatic printing apparatus including structure for delivering developer or toner particles to a printhead forming an integral part of the printing device. The toner particles are attracted from a toner delivery system (24) towards a support for an image receiving substrate (30), passing through apertures (76) in the printhead structure. The printhead structure includes control electrodes (70) and a shield electrode structure (72) secured to opposite sides of an insulative base (31). The radius of the opening of a control electrode (70) is smaller than the radius of a corresponding shield electrode (72) opening resulting in larger peak potentials for controlling toner flow for the same voltage applied to the control electrode of a printhead aperture wherein the control electrode opening is larger than the opening in a corresponding shield electrode opening.

公开(公告)号：CA2135704A1

公开(公告)日：1995-06-14

申请号：CA2135704

申请日：1994-11-14

Applicant: XEROX CORP

Inventor： CONNORS EDWARD W ,  CONNERS EDWARD W ,  SCHMIDLIN FRED W ,  MARTIN ROBERT G

IPC: G03G21/16 ,  G03G15/08 ,  G03G15/34 ,  G03G15/16

Abstract: Apparatus for creating powder images. An image forming member and a toner delivery system are supported opposite each other. The images are formed by the image forming member along a first direction. The toner delivery system includes a toner transport for moving toner particles from a supply to a zone opposite the image forming member. The transport moves along a second direction which is non-parallel to the first direction.

公开(公告)号：CA1302074C

公开(公告)日：1992-06-02

申请号：CA550202

申请日：1987-10-26

Applicant: XEROX CORP

Inventor： SCHMIDLIN FRED W

IPC: B41J2/385 ,  G03G15/05 ,  G03G15/08 ,  G03G15/34 ,  G03G17/00 ,  G03G15/09

Abstract: Direct electrostatic printing apparatus including structure for delivering developer or toner particles to a printhead forming an integral part of the printing device. The printing device includes, in addition to the printhead, a conductive shoe which is suitably biased during a printing cycle to assist in the electrostatic attraction of developer through apertures in the printhead onto the copying medium disposed intermediate the printhead and the conductive shoe. The structure for delivering developer or toner is adapted to deliver toner containing a minimum quantity of wrong sign and size toner. To this end, the developer delivery system includes a conventional magnetic brush which delivers toner to a donor roll structure which, in turn, delivers toner to the vicinity of apertures in the printhead structure.