Dry hot roll fusher having early fusing nip closure

Abstract From the Canadian patent

Abstract, A dry release hot roll fuser wherein the hot roll is internally heated, the surface of the hot roll is de-Formable and a rigid backup roll, is force biased into the hot roll to form an axial depression in the hot roll, which depression comprises the fusing nip. The fusing nip is closed prior to the arrival of a sheet to be fused. The early closing time interval is such as to cause the hot roll to complete at least one revolution against the cooler backup roll, prior to arrival of the first sheet to be fused. In the standby mode, the fusing nip is open and the hot roll, temperature is controlled to be at a temperature higher than the desired fusing temperature. This higher …