Color transparency reproducing machine

An electrophotographic printing machine for reproducing a color transparency, including:

• a photoconductive member;
• a means for charging at least a portion of said photoconductive member;
• a platen;
• means for projecting a light image of the transparency onto said platen;
• a screen member disposed on said platen for modulating the light image of the transparency projected onto said platen to form a half-tone light image thereof;
• means for filtering the half-tone light image to form a single color light image;
• a composition frame disposed on said platen defining an opaque border extending outwardly from the color transparency image formed on said platen;
• means for exposing the charged portion of said photoconductive member to a light image of said composition frame and the single color half-tone light image of the transparency to record on said photoconductive member a combined electrostatic latent image of the transparency and the electrostatic latent image of said composition frame:
• means for developing the combined electrostatic latent image recorded on said photoconductive member with toner particles complementary in color to the color of the single color light image;
• means for transferring the toner powder image adhering to the combined electrostatic latent image recorded on said photoconductive member to a sheet of support material, said transferring means comprising corona generating means disposed adjacent to said photoconductive member and adapted to apply an alternating charge potential to said photoconductive member pre-conditioning the toner particles thereon to readily facilitate the transfer therefrom, a transfer member operatively associated with said corona generating means and having the sheet of support material secured releasably thereto, means for electrically biasing said transfer member to a potential of sufficient magnitude and polarity to attract the pre-conditioned toner particles from the combined electrostatic latent image recorded on said photoconductive member to the sheet of support material secured thereto;
• and
• means for fusing the toner powder image to the sheet of support material.