Abstract: An apparatus in which a latent image of an original document is recorded on a photosensitive member. A light image of the original document is projected through a normally non-deformed transparent member onto the photosensitive member. An operator actuatable control deforms the transparent member producing a plurality of spaced grooves therein. The light image transmitted through the grooved portion of the transparent member is phase shifted with respect to the light image transmitted through the non-grooved portion thereof. In this way, the operator may deform the transparent member producing a modulated light image, or permit the transparent member to remain in the non-deformed condition so as not to modulate the light image.

Abstract: An apparatus in which a metered quantity of release material is applied to a fuser roll. The release material is heated to maintain it substantially in a fluid state.

Abstract: A method of reproducing a color highlighted original document in which at least two successive latent images are recorded on an overcoated photoconductive surface. One of the latent images corresponds to the black regions of the original document, while the other latent image corresponds to one of the color regions of the original document.

Abstract: A method for color accenting selected portions of a photocopy wherein a photoconductive surface is exposed to a light image of the document being reproduced, the non-selected portions of the resulting latent image are erased prior to developing the image with a given colored toner, and the developed image is transferred to a copy sheet before a subsequent reproduction of the document is performed. During the subsequent reproduction, the non-selected portions of the latent image remain on the photoconductive surface and the selected portions are erased prior to development with a different color than the given colored toner of the non-selected portions of the document and the transfer of the non-selected portions to the same copy sheet that previously received the selected portions.

Abstract: An apparatus which regulates the developability characteristics of a development system employing a developer mixture comprising at least carrier granules and toner particles. A transparent electrode attracts toner particles from the carrier granules. Light rays are transmitted through the electrode with the particles thereon. Sensors having peak transmittances corresponding to the peak transmittance and absorbence of the toner particles, detect the intensity of the light rays transmitted through the electrode and generate electrical output signals indicative thereof. These signals are processed and a control signal is developed which regulates the dispensing of additional toner particles into the developer mixture. In this manner, the concentration of toner particles within the developer mix is adjusted.

Abstract: An electrophotographic printing machine in which a transparency or an opaque original document is reproduced. In reproducing a transparency, a mirror is pivoted from a position remote from the light image path into the path of the transparency light image. When an opaque original document is being reproduced, the mirror is pivoted to the position remote from the light image path.

Abstract: An apparatus which renders a latent image visible by depositing developer material thereon. The apparatus includes a tubular member having a styrene-butadiene layer coated on a nonmagnetic roll. Magnets are disposed interiorly of the tubular member to attract the developer material thereto. The developer material is transported into contact with the latent image to produce a powder image thereon.

Abstract: A control system in which the thermal energy produced by a first heat source and a second heat source cooperating therewith is regulated by adjusting the phase of the voltage applied thereto.

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.

Abstract: An apparatus in which heat settable particles are substantially permanently affixed to a sheet. The apparatus includes a fuser member having a supply of release material applied thereto from a chamber in a housing. The release material is a liquid when the fuser member is at its operating temperature. However, when the fuser member is de-energized, the release material solidifies. Baffles are provided in the chamber of the housing to facilitate solidification of the release material adjacent to the fuser member.

Abstract: An apparatus in which a developer material is moved adjacent an electrostatic latent image so that the latent image attracts the developer material thereto in image configuration. The developer material is advanced from a supply thereof to the latent image, with the unused developer material being returned thereto. As the developer material returns to the supply thereof, the velocity in the central region is greater than in the marginal regions.The foregoing is achieved by passing the unused developer mix through a plate having a plurality of progressively shorter chutes in an inwardly direction disposed symmetrically about the central region thereof. In this manner, the unused developer mix has a greater velocity in the central region than in the marginal regions thereof preventing the developer mix from clogging the chutes of the plate.

Abstract: An apparatus in which successive layers of charged particles are transferred, in superimposed registration with one another, to a sheet of support material. The sheet of support material is reciprocated so that successive forward movements thereof are in synchronism with the movement of the charged particles. On the return movement, the sheet of support material is located in a position to initiate the transfer of the next successive layer of particles in superimposed registration with the previously transferred layer of charge particles during the forward movement thereof.

Abstract: An electrophotographic printing machine in which particles are cleaned from a half-tone image screen. The screen is movable from an operative position closely adjacent to the printing machine photoconductive member to an inoperative location remote therefrom. As the screen moves in one direction, a cleaning device moves in a direction opposed thereto so as to remove particles therefrom.

Abstract: An electrophotographic printing machine in which a transparency or opaque original document is reproduced. A movable screen is located in a first position spaced from the path of the transparency light image in order to reproduce the original document. When the transparency is being reproduced, the screen is moved to a second position in the path of the transparency light image for modulating the light image thereof.

Abstract: An electrophotographic printing machine in which color transparencies are reproduced. The printing machine includes a notch filter which transmits blue and green light images of the color transparency therethrough while blocking a portion of the red light image from passing therethrough.

Abstract: An optical system in which a light image of an original document is projected onto a light sensitive member. The light image passes through a rotating screen at discrete time intervals forming successive half-tone light images at differing screen angles.

Abstract: An apparatus in which an original document is housed. The support on which the original document is positioned becomes selectively opaque so as to mask portions of the original document disposed thereon.

Abstract: A fusing apparatus in which particles are affixed substantially permanently to a moving sheet of support material. Each portion of the leading marginal region of the sheet of support material is advanced substantially simultaneously between a fuser roll and a backup roll. As the sheet a support material passes between the fuser roll and backup roll, the side marginal regions thereof advance at a greater velocity than the central region. In this manner, a force component substantially normal to the path of movement of the sheet of support material in the plane thereof, is applied thereto preventing wrinkling.

Abstract: A dual mode color electrostatographic printing machine in which either a pictorial copy or a functional copy of an original document is reproduced. Either mode of operation is selectable. In the pictorial copying mode, the latent image recorded on the photoconductive surface is modulated by a line screen pattern. Contrariwise, in the functional copying mode, the latent image remains un-modulated. The screen is shifted by one-third of the spacing between the lines in the screen for each successive color separation exposure.

Abstract: An apparatus in which the alignment of an optical system is displayed, thereby enabling misalignments therein to be corrected. The alignment apparatus, in conjunction with the optical system, generates a narrow sample light image. This sample light image is displayed so as to depict the optical system misalignment. Thereafter the optical system is adjusted and a corrected sample light image produced. The corrected sample light image is once again displayed to insure that the optical system is in alignment.