HIGH SPEED PRINTING SYSTEM WITH HEATED ROLL FUSER

摘要

Thermoplastic powder images delivered in succession from the transfer station of a copy machine or the equivalent station of another electrostatic printer at a high rate of speed are fixed to a support sheet by heat and pressure in a substantially slower moving fusing roll couple. This differential speed enables the operation of the fusing roll couple at lower temperatures and pressures to make practical the use of an internally heated fusing roll having a deformable surface. The speed of the fusing roll couple is perferably selected to substantially eliminate the space between successively delivered copies such that the rolls of the roll couple need not be separated between successive copies. A conveyor that transports copies to the roll couple is preferably driven with a programmed speed to match the speed at which a copy is generated and to alternately match the slower speed of the fusing roll couple as the copy is introduced thereto.