US 4,068,939 AGranted

Color transparency reproducing machine

AssigneeXerox Corporation

InventorLouis D. Mailloux

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Abstract

An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light image. A charged photoconductive member is irradiated by the single color half-tone light image recording a single color electrostatic latent image thereon.

Claims6

Dependent claims

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

a platen;
means for projecting a light image of the color transparency onto said platen;
a screen member disposed on said platen for modulating the light image of the color transparency projected onto said platen to form a half-tone light image thereof;
a photoconductive member;
means for charging at least a portion of said photoconductive member;
means for filtering the half-tone 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 filtered half-tone light image of the color transparency to record a combined electrostatic latent image of the color transparency and said composition frame on said photoconductive member;
means for developing the combined electrostatic latent image recorded on said photoconductive member with toner particles complementary in color to the color of the filtered half-tone light image, said developing means comprising a first developer housing defining a chamber storing a developer mix comprising carrier granules and yellow toner particles, first conveyor means mounted for movement within the chamber of said first developer housing and arranged to move the developer mix from a first region to an intermediate region, first rotary driven transport means mounted within the chamber of said first developer housing and arranged to move the developer mix from the intermediate region to a second region for discharge thereat, first rotary driven developer means mounted within the chamber of said first developer housing closely proximate to said first transport means for receiving the developer mix therefrom and arranged to deposit yellow toner particles onto a blue filtered electrostatic latent image when in operative communication therewith, and first means for driving said first conveyor means such that the reaction torque to the driving moment applied to said first conveyor means pivots said first developer housing disposing said first developer means adjacent the blue filtered electrostatic latent image recorded on said photoconductive member;
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;
and
means for fusing the toner powder image to the sheet of support material.

9 more elements

Dependencies are inferred from the claim text.

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Abstract

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

a platen;
means for projecting a light image of the color transparency onto said platen;
a screen member disposed on said platen for modulating the light image of the color transparency projected onto said platen to form a half-tone light image thereof;
a photoconductive member;
means for charging at least a portion of said photoconductive member;
means for filtering the half-tone 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 filtered half-tone light image of the color transparency to record a combined electrostatic latent image of the color transparency and said composition frame on said photoconductive member;
means for developing the combined electrostatic latent image recorded on said photoconductive member with toner particles complementary in color to the color of the filtered half-tone light image, said developing means comprising a first developer housing defining a chamber storing a developer mix comprising carrier granules and yellow toner particles, first conveyor means mounted for movement within the chamber of said first developer housing and arranged to move the developer mix from a first region to an intermediate region, first rotary driven transport means mounted within the chamber of said first developer housing and arranged to move the developer mix from the intermediate region to a second region for discharge thereat, first rotary driven developer means mounted within the chamber of said first developer housing closely proximate to said first transport means for receiving the developer mix therefrom and arranged to deposit yellow toner particles onto a blue filtered electrostatic latent image when in operative communication therewith, and first means for driving said first conveyor means such that the reaction torque to the driving moment applied to said first conveyor means pivots said first developer housing disposing said first developer means adjacent the blue filtered electrostatic latent image recorded on said photoconductive member;
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;
and
means for fusing the toner powder image to the sheet of support material.

9 more elements