Copying apparatus in which an image of charged particles of imaging material is transferred from one supporting surface to a sheet of support material, while the sheet of support material is held on an apertured vacuum belt and an electrical transfer field is applied thereto, where the vacuum belt comprises electrically relaxable material to prevent print-out of the vacuum apertures on the support material. The coping apparatus includes a multiple registered transfer system for color copying with reciprocating of the supporting vacuum belt.