Patent ID: 7349640

Claim:
A method of controlling the accumulation of heat in stacked sheets of media in a printing or copying device, said device having a collection location for collection of a plurality of media sheets, wherein the sheets of media include toner images, and a fixing device to fix said toner images on said media at a selected temperature, comprising the steps of providing in said printing or copying device a control system wherein said control system: identifies media for printing or copying at a selected fuser temperature and adjusts said fuser temperature for selected media based upon media thermal capacitance, wherein said selected fuser temperature is set lower for media having a relatively higher thermal capacitance; clears or accumulates a count of sheets of media based on the media thermal capacitance, wherein if said media has a relatively lower thermal capacitance said count of sheets is cleared and if said media has a relatively higher thermal capacitance said count of sheets is incremented; identifies a maximum media sheet count for media having a relatively higher thermal capacitance and increases the time interval between sheets of media reaching the fixing device when said count of sheets having a relatively higher thermal capacitance equals said maximum media sheet count for media having a relatively higher thermal capacitance; and clears or increments a cooling timer based on the media thermal capacitance.