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Electrostatic Print Mechanism for Dry Offset Printing

IP.com Disclosure Number: IPCOM000099350D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Afzali, A: AUTHOR [+3]

Abstract

An image is generated with an IBM 4250 Electroerosion Printer using a special developed Electronegative plate referred to from hereon as the Masterplate. The Masterplate is then electrostatically charged attracting a thermal toner to the image area. This carbon (toner) covered image is then transferred to a second surface which is appropriately charged such that the toner transfers to that second surface. At the point where this transfer is to take place the electrostatic charged Masterplate is discharged through appropriate corona discharge, causing the toner to be drawn onto the electrostatic charged second surface.

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Electrostatic Print Mechanism for Dry Offset Printing

       An image is generated with an IBM 4250 Electroerosion
Printer using a special developed Electronegative plate referred to
from hereon as the Masterplate.  The Masterplate is then
electrostatically charged attracting a thermal toner to the image
area.  This carbon (toner) covered image is then transferred to a
second surface which is appropriately charged such that the toner
transfers to that second surface.  At the point where this transfer
is to take place the electrostatic charged Masterplate is discharged
through appropriate corona discharge, causing the toner to be drawn
onto the electrostatic charged second surface.

      Once the toner is deposited onto this second surface the paper
on which the image is to be printed is pressed against this surface.
When the image has been transferred onto the paper a heat treatment
fuses the toner to the paper.

      A second way of producing a printed image on the Masterplate is
instead of using an electrostatic charged electroeroded image, the
image is produced with the use of a thermal transfer process, such as
used in the QUIETWRITER* printer.  A special developed ribbon,
substituting the regular ink with a photoconducting or dielectric
ink, is used to print the image on the Masterplate.  This ink has the
added advantage that it can be charged and or discharged with a
corona discharge and or light.  This method reduces the problem of
leakage of the...