| 摘要 |
In a thermal fixing device, a roller having a heat generating element includes a heating and cooling unit which is made up of a cooling device which serves also as a support, and a heat generating device with a PTC thermistor heater element as a heat source so that an endless metal belt which is turned while being in contact with the heating and cooling is heated on the transfer sheet inlet side and cooled on the transfer sheet outlet side. Thus, the toner on a transfer sheet which is not fixed yet is heated to higher than the melting point on the transfer sheet inlet side so as to be molten and permeated in the transfer sheet, and cooled on the transfer sheet outlet side, and then separated from the metal belt. The surface of the metal belt is covered with lubricative resin, to prevent the occurrence of low temperature offset or high temperate offset, with a result that the fixing operation is stable at all times.
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