| 摘要 |
An apparatus and method for efficiently transferring a toner image from a rotatable electrostatic drum to a copy sheet while the copy sheet remains in a substantially flat position without degrading the quality of the latent image on the drum by imposing an electrical field between the copy sheet and drum as the sheet moves away from the drum surface after the toner image has been transferred to the copy sheet. In one embodiment of the invention, a movable, endless, two-layer belt having an inner layer of conductive material and an outer layer of relatively nonconductive material carries the copy sheet through the transfer station in a plane substantially tangent to the surface of the drum. An electrical bias is applied to the inner layer of the belt which attracts toner from the electrostatic drum to the copy sheet, but charge is prevented from reaching the copy sheet and drum by the relatively nonconductive layer of the belt. Small holes can be made in the belt and a vacuum placed on the copy sheet through the holes to insure there is no relative motion between the copy sheet and belt during the transfer step.
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