Browse Prior Art Database

Paper Detack/Transfer System

IP.com Disclosure Number: IPCOM000047006D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Seigal, SD: AUTHOR

Abstract

Copy sheets are reliably detached from a photoconductor or dielectric imaging medium without diminishing image transfer by applying an AC corona to the initial leading edge of the copy sheet. In the example shown, an imaging means in the form of a flexible belt type of photoconductor 10 passes around a roller 11. By means not shown, an image is placed upon photoconductor 10 and toned subsequent to engaging paper copy sheet 15. Both paper 15 and the image on photoconductor 10 compete for the same toner indicated generally at 20. Forces that transfer toner 20 to paper 15 also attract paper 15 to the image means of photoconductor 10. Thus, steps to counteract attraction of paper 15 to photoconductor 10 also counteract transfer of toner 20 to paper 15.

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Paper Detack/Transfer System

Copy sheets are reliably detached from a photoconductor or dielectric imaging medium without diminishing image transfer by applying an AC corona to the initial leading edge of the copy sheet. In the example shown, an imaging means in the form of a flexible belt type of photoconductor 10 passes around a roller 11. By means not shown, an image is placed upon photoconductor 10 and toned subsequent to engaging paper copy sheet 15. Both paper 15 and the image on photoconductor 10 compete for the same toner indicated generally at 20. Forces that transfer toner 20 to paper 15 also attract paper 15 to the image means of photoconductor 10. Thus, steps to counteract attraction of paper 15 to photoconductor 10 also counteract transfer of toner 20 to paper 15. Highly charged paper 15 follows the wrap angle around roller 11 instead of proceeding in the output direction 21. AC coronas in prior systems neutralize highly charged paper to allow detack, but this also severely diminishes the electric fields which transfer the toned image, thereby reducing copy density and increasing residual image toner. High frequency switching AC corona 25 is energized as the leading edge 16 reaches the point of detack. This neutralizes electrostatic forces of attraction between the paper edge and image means 10. The edge is reliably detacked from the image means and proceeds towards output 21 primarily because of its beam strength. Corona 25 is switched off as the re...