Smart Multi-Component Developer Dispensing System as a dynamic solution for two-component developer instabilities
Publication Date: 2003-Aug-15
The IP.com Prior Art Database
This invention proposes a smart multi-component electrophotographic dispensing system to fix problems of additive depletion and the change of toner additive optimum set point, often brought about by aging or changes in environment. It is proposed to introduce a second auxiliary dispenser. Such a system contains developer with a toner concentration, (TC), that can be different than that used in the first or normal trickle sub-system and which can have an additive concentration (AC) which is also different.
There are several image quality related problems that develop when the toner additives on a toner change with time due to selective development or mechanical stress inside the development housing. In addition there are cases where modifications of the additive formulation would be beneficial to obtaining optimum performance. One example is impaction of a silica additive. It is used as both a flow aid and a spacer particle and enables good cleaning and transfer by preventing intimate toner-toner or toner-substrate contact. When used with spherical toner, this additive impacts onto the developer housing, the photoreceptor, carrier bead surfaces, and the interior of the toner. Over time the additive becomes ineffectual, resulting in transfer and cleaning problems and ultimately leads to system failure. An example of where modification of the additive formulation would be beneficial is the case of changing humidity varying toner triboelectric charge. Finding the best overall additive loading set point, and accommodating system fluctuations around that operating point typically solves both of these classes of problems.
This invention proposes a smart multi-component electrophotographic dispensing system to fix problems of additive depletion and the change of toner additive optimum set point, often brought about by aging or changes in environment. It is proposed to i...