Adaptive fuser controller

DETAILED DESCRIPTION It is an object of the instant invention to overcome the disadvantages of the prior art by providing an adaptive control logic circuit for operating the fuser element of a copier/duplicator having multiple modes of operation.
It is another object of the invention to provide a partial power or Soft turn-on feature during copier/duplicator cycles for the different modes of operation of the copier/duplicator so as to achieve reduced internal heat rise and input power surges, thereby improving copy quality.
It is a further object of the invention to provide a partial or Soft turn-on fuser in combination with a full power turn-on fuser for all single copy modes of operation of a copier/duplicator machine.
Another object of the invention is to provide a control circuit in which a combination of low and high power fuser operation is utilized to assure adequate preheating of the fuser element, and subsequently, at the precise moment proper fusing temperature and stability.
It is another object of the invention to delay full power fuser energizing until the image-bearing copy paper is a very short distance from the fusing element, thus eliminating excessive heat buildup resulting from too long a fuser energizing period.
It is further objective of the invention to provide a control circuit in which an independent precise time base is used to control the turn off time of the fuser element.
Another object of the invention is to provide a fuser Soft turn-on and full power turn-on feature in a copier/duplicator machine having multiple modes of operation, and to provide an adaptive control circuit to optimize the operation of the fuser element during different modes of copier/duplicator operation.
Yet another object of the invention is to provide an adaptive fuser controller which is responsive to various copy paper sizes employed in the copier/duplicator.
Yet another object of the invention is to provide an adaptive fuser controller for a copier/duplicator which may be utilized in a large document mode of operation for preventing input power surges