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Reinkable Ribbon Electrostatic Printing System

IP.com Disclosure Number: IPCOM000043918D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Imaino, W: AUTHOR [+2]

Abstract

A non-impact electrostatic printing system is described which uses a ribbon which can be inked with toner and selectively transferred to plain paper in the desired character pattern in response to character signals coupled to an array of electrodes. The printing apparatus comprises an endless high resistance ribbon 10 which is uniformly charged to a selected polarity. This ribbon is then coated with a uniform dense layer of high resistance toner 12. The toned ribbon is then moved adjacent to a suitable print medium 14, such as plain paper, which is positioned in intimate contact with a conductive electrode 16. Electrode 16 is biased with a potential of the proper polarity to attract the toner 12 from ribbon 10, but the potential is insufficient to overcome the forces holding the toner onto the ribbon.

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Reinkable Ribbon Electrostatic Printing System

A non-impact electrostatic printing system is described which uses a ribbon which can be inked with toner and selectively transferred to plain paper in the desired character pattern in response to character signals coupled to an array of electrodes. The printing apparatus comprises an endless high resistance ribbon 10 which is uniformly charged to a selected polarity. This ribbon is then coated with a uniform dense layer of high resistance toner 12. The toned ribbon is then moved adjacent to a suitable print medium 14, such as plain paper, which is positioned in intimate contact with a conductive electrode 16. Electrode 16 is biased with a potential of the proper polarity to attract the toner 12 from ribbon 10, but the potential is insufficient to overcome the forces holding the toner onto the ribbon. An array of print electrodes 18 is positioned closely adjacent to ribbon 10, and electrodes 18 are selectively energized with suitable character signals at a high potential to produce a charge image on the untoned side of ribbon 10. The charge image causes a toned image to be transferred to print medium 14, and preferably the transfer is accomplished during a small relative movement between print medium 14 and ribbon 10 to overcome the dispersive forces. The toned image is then fixed to print medium 14 by known techniques, and ribbon 10 is discharged and cleaned so that the process can be repeated. In a particular embod...