Transfer paper guide device for an electrostatic photographic apparatus

Abstract

An electrostatic photographic apparatus includes a photosensitive drum and a fixing device composed of a pair of rollers pressure-contacted with each other over a predetermined nip width, in which a toner image formed on the photosensitive drum is transferred onto a lower surface of a transfer paper transported over an upper portion of the photosensitive drum while contacting therewith and is fixed by a nip portion of the rollers of the fixing device, an inlet end of the nip portion is disposed on a curve of a cross section of the transfer paper when the latter is warped with a radius of curvature smaller than a radius of curvature of cross section of a transfer paper having stiffness smallest among other transfer papers usable in the apparatus when the transfer paper of the smallest stiffness is supported at its rear end horizontally at a point at which the transfer paper leaves the photosensitve drum while allowing the other portion thereof to be drooped freely by gravity, a tangential line of the rollers at a center of the nip portion being substantially coincident with a tangential line of the curve, and guide member having a lower guide surface convexed upwardly is arranged along the curve between the separating point of the transfer paper from the photosensitive drum and the inlet end of the nip portion.