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Browse Prior Art Database

CLEANABLE TRANSFER PRESSURE BLADE SYSTEM

IP.com Disclosure Number: IPCOM000025972D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 104K

Publishing Venue

Xerox Disclosure Journal

Abstract

Conventional corotron transfer sometimes results in unacceptable transfer deletion image quality defects when perforated, cockled, or other non-flat copy sheets are used. One reason that transfer fails to occur is that the transfer field is too low, because the transfer gap is too large due to the non-flat nature of the sheet. A possible solution to the deletion problem is to apply a mechanical force to the paper during transfer to flatten the paper. While a flexible blade might be used to bias the paper against a photoreceptor during transfer, if the blade runs on the photoreceptor in the interdocument areas, the blade will become dirty with toner and debris. Eventually, dirt on the blade is transferred to copy sheets.

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XEROX DISCLOSURE JOURNAL

CLEANABLE TRANSFER PRESSURE Proposed Classification BLADE SYSTEM U.S. c1.35513
George C. Hartmann Int. C1. G03g 15/00

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14

18

Volume 14 Number 3 May/June 1989 127

[This page contains 1 picture or other non-text object]

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CLEANABLE TRANSFER PRESSURE BLADE SYSTEM (Cont'd)

Conventional corotron transfer sometimes results in unacceptable transfer deletion image quality defects when perforated, cockled, or other non-flat copy sheets are used. One reason that transfer fails to occur is that the transfer field is too low, because the transfer gap is too large due to the non-flat nature of the sheet. A possible solution to the deletion problem is to apply a mechanical force to the paper during transfer to flatten the paper. While a flexible blade might be used to bias the paper against a photoreceptor during transfer, if the blade runs on the photoreceptor in the interdocument areas, the blade will become dirty with toner and debris. Eventually, dirt on the blade is transferred to copy sheets.

With reference to Figure 1, it is proposed that to transfer toner images from photoreceptor belt 10 without the problem of transfer deletions, a transfer pressure blade 12 is arranged to bias an endless loop member 14 into pressure engagement with the photoreceptor-toner-copy sheet sandwich, against the backside of the copy sheet 16. Endless loop 14 is supported for movement along a closed path around a pair of rollers 18, 20 disposed on either s...