Browse Prior Art Database

Transfer Device

IP.com Disclosure Number: IPCOM000079883D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Simpson, HW: AUTHOR

Abstract

A negative electrostatic image presented on photoconductive drum 10 is developed by positive toner in development unit 11, and is delivered to transfer station 12 for transfer to paper 13 to form final copy. Transfer station 12 includes a compliance roller 14 having a conductive inner portion 15 and a flexible dielectric outer surface 16. A power supply 17 is connected to both the interior 15 of roll 14 and to brush 18 contacting the surface of dielectric 16. Roller 14 thus provides a transfer field having a minimum tendency to transfer charge to or from copy paper 13, due to the presence of dielectric surface layer 16. Brush 18 restores the surface of dielectric 16 to the potential of roll core 15 to maintain a uniform transfer potential.

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Transfer Device

A negative electrostatic image presented on photoconductive drum 10 is developed by positive toner in development unit 11, and is delivered to transfer station 12 for transfer to paper 13 to form final copy. Transfer station 12 includes a compliance roller 14 having a conductive inner portion 15 and a flexible dielectric outer surface 16. A power supply 17 is connected to both the interior 15 of roll 14 and to brush 18 contacting the surface of dielectric 16. Roller 14 thus provides a transfer field having a minimum tendency to transfer charge to or from copy paper 13, due to the presence of dielectric surface layer 16. Brush 18 restores the surface of dielectric 16 to the potential of roll core 15 to maintain a uniform transfer potential.

Electrostatic image on photoconductive surface 10 is maintained undisturbed through the transfer operation, due to the limitation on charge transfer provided by dielectric surface 16. Accordingly, a single electrostatic image can be redeveloped in unit 11 without having a new image created.

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