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A copier/printer is described which has the capability of copying a blank form and then printing the desired information in the blanks.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
64% of the total text.
Page 1 of 1
Combination Copier Printer
A copier/printer is described which has the capability of copying a blank form
and then printing the desired information in the blanks.
The conventional copier mode uses positive to positive printing so that the
photoconductor is exposed in the non-image areas, and for this reason a form
cannot be subsequently exposed in the non-image areas. Some printers,
however, use a negative-to-positive printing process, and in this case the
photoconductor remains charged in the non-image areas after exposure and
these non-image areas can be subsequently imaged by a second exposure, such
as the outline of a form, for example. Discharge area development then yields
the desired image.
The apparatus described herein utilizes the unique properties of a
monocomponent developer system to enable the apparatus to work in either the
conventional copier or the negative-to-positive printer mode. Since
monocomponent developer systems rely on conduction for toner charging, the
system can be used for either charged area development or discharged area
development simply by changing the bias on the developer roll. In the normal
copying mode, the apparatus operates in the standard way of positive-to-positive
imaging and development. When in the printing mode, however, the machine
operates in the negative-to-positive mode. In this mode, a special negative
document, such as a letterhead or form, is exposed at the document platen, and
a scanning laser beam or other me...