Dry hot roll fusher having early fusing nip closure

Details Dry hot roll fusher having early fusing nip closure Dry hot roll fusher having early fusing nip closure

G - Physics

03

G

314/38.5

G03G 15/20 (2006.01)

Patent

CA 1071694

DRY HOT ROLL FUSER HAVING EARLY FUSING NIP CLOSURE 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 revolu- tion 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 temperature is desirable since it is known that the thick deformable surface on the hot roll will cause the fusing temperature to droop during fusing. Since the hot roll's surface is relatively thick, and formed of a heat insulator, such as silicone rubber, the droop which occurs is a result of the cooling effect of the first sheets to be fused. After the early closing interval, the hot roll's fusing temperature has drooped to the vicinity of the optimum fusing temperature and the automatic temperature control system thereafter supplies just -1- enough additional internal heat energy to offset the cooling effect of the sheets. The probability of the first sheet sticking to the hot roll has been reduced as a result of this roll early closing. To accommodate the high standby temperature, the fusing nip is closed early--i.e. before a sheet arrives at the fusing nip. The time period of this early closure is critical, and has been found to be such as will produce at least one revolution of the hot roll prior to the arrival of a sheet to be fused. It has been found that this early closing of the fusing nip causes a rapid droop in the fusing nip temperature to approximately the optimum fusing temperature prior to arrival of the first sheet to be fused, and thereafter the temperature control system maintains the optimum temperature. Thus, wrap of the sheets about the hot roll is minimized.

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