Browse Prior Art Database

Combination Copier Printer

IP.com Disclosure Number: IPCOM000051840D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Wilbur, CV: AUTHOR

Abstract

A copier/printer is described which has the capability of copying a blank form and then printing the desired information in the blanks.

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This is the abbreviated version, containing approximately 64% of the total text.

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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...