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SCAVENGELESS DEVELOPMENT WITH ELECTRICALLY REGENERATED DONOR BELT

IP.com Disclosure Number: IPCOM000027174D
Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 167K

Publishing Venue

Xerox Disclosure Journal

Abstract

Well known in the development of electrostatic latent images in xerographic printers are the use of scavengeless development processes, for example, those described in US-A-4,868,600 to Hays et al., issued Sep. 19, 1989, US-A- 5,010,367 to Hays, issued Apr. 23, 1991, US-A-5,128,723 to Bolte et al, issued Jul. 7, 1992, US-A-5,144,371 to Hays, issued Sep. 1, 1992. Generally, AC biased wires or electrodes positioned over the toner covered donor element causes the charged toner particles to "jump" therefrom, forming a powder cloud in the development zone. In scavengeless type development systems employing a donor belt and AC biased electrodes located behind the belt, for instance, those described by Schmidlin in US-A-5,276,466, issued Jan. 4,1994, there exists a problem of residual charge remaining on the conductive donor belt following development. To correct this problem, it is proposed that an insulating belt be employed with a conductive roll maintained at ground potential to contact the insulating donor belt as the last step of the development process in order to deplete any residual charge thereon.

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XEROX DISCLOSURE JOURNAL

SCAVENGELESS DEVELOPMENT Proposed Classification WITH ELECTRICALLY U.S. C1.3551251 REGENERATED DONOR BELT
Judith P. Meester
Zoran D. Popovic

Int. C1. G03g 15/09

XEROX DISCLOSURE JOURNAL - VOI. 20, NO. 4 JuIy/AU@ISt 1995 323

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SCAVENGELESS DEVELOPMENT WITH ELECTRICALLY REGENERATED DONOR BELT(Cont'd)

Well known in the development of electrostatic latent images in xerographic printers are the use of scavengeless development processes, for example, those described in US-A-4,868,600 to Hays et al., issued Sep. 19, 1989, US-A- 5,010,367 to Hays, issued Apr. 23, 1991, US-A-5,128,723 to Bolte et al, issued Jul. 7, 1992, US-A-5,144,371 to Hays, issued Sep. 1, 1992. Generally, AC biased wires or electrodes positioned over the toner covered donor element causes the charged toner particles to "jump" therefrom, forming a powder cloud in the development zone. In scavengeless type development systems employing a donor belt and AC biased electrodes located behind the belt, for instance, those described by Schmidlin in US-A-5,276,466, issued Jan. 4,1994, there exists a problem of residual charge remaining on the conductive donor belt following development. To correct this problem, it is proposed that an insulating belt be employed with a conductive roll maintained at ground potential to contact the insulating donor belt as the last step of the development process in order to deplete any residual charge thereon.

Accordingly, the present disclosure proposes a scavengeless development system, as illustrated in the figure, for developing an electrostatic latent image on the surface of photoconductor 10. More specifically, donor belt 12 is supported for movement through the development zone 16 (i.e. space between the charge retentive surface and the donor belt) by a drive roll 20, idler roll 22 and a development shoe 24. The drive roller 20 is driven via a drive motor (not shown) operatively connected thereto in a well known manner. The spacing or gap between the charge retentive surface and the donor belt is on the order of 5-20 mils. The belt 12 is a seamless construction and preferably has a thickness of 1 to 3 mils and is fabricated from an insulating material.

Charged toner particles are conveyed to a loading zone 37 using a magnetic brush device 40 which comprises a stationary magnet assembly within a rotatable sleeve. A two component developer comprising carrier beads and toner particles is contained in a supply sump 42 from which it is conveyed by the magnetic brush device 40 to the loading zone 37. Once the donor belt is "loaded" with charged donor particles under a positive electrical b...