SPLIT TRANSFER COROTRON SHIELD DESIGN CONCEPT
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
An electrostatic field is required to achieve image transfer to a copy sheet in an electrophotographic printing machine or copier. The electrostatic field is provided by a corotron having a dynamic current representing the difference between supplied current and return current. The dynamic current is the transfer field control mechanism which is monitored by sensing the return current flowing through the corotron shield. In order to monitor shield current, the corotron shield must be isolated from machine ground, other current sources, and returned back to an appropriate power supply. This is easily achieved with for a single device corotron. However, for a dual corotron sharing a common shield such as a transfer and detack corotron, total current delivered to the multiple devices limits performance and stresses copy substrates. As a corrective action, it is proposed that the common shield be split into two elements.