Abstract: In an electrostatic apparatus using a toner layer carried by a developing roller for developing a latent image, a doctor blade applied with a voltage of the same polarity as that of the toner is used for partly scraping the toner layer. The toner scraped off is sucked by a suction means. An additional doctor blade is preferably used together with the main doctor blade to make rough and fine control of the thickness of the toner layer.

Abstract: A liquid developing system for developing an electrostatic latent image formed on a copy paper includes a mesh plate development electrode disposed in a traveling path of the copy paper so that the image carrying surface of the copy paper confronts the mesh plate development electrode. A developer liquid supplying roller is provided for supplying the developer liquid to the mesh plate development electrode for forming a swelling developer liquid surface on the mesh plate development electrode. The image carrying surface of the copy paper makes contact with the thus formed swelling developer liquid surface, and the superfluous developer liquid is removed through the mesh plate development electrode.

Abstract: This specification discloses a method of toner transfer development in which one-component magnetic developer is conveyed to a developing position by the action of a magnetic field and a low frequency alternating electrical bias is applied to the space between a latent image bearing member and a developer carrying member at that position to thereby develop a latent image. This development provides visible images excellent in sharpness and tone reproduction.

Abstract: Apparatus and method for adjusting in situ the conductivity of the developer bristles of a magnetic brush development station in a copier to optimize toner development of electrostatic images.

Abstract: The present invention provides a developing method for electrophotography which is developed to perform the development by electrically insulating the developing electrode from the support of the photosensitive material, together with apparatuses suitable for practicing said method. This developing method is applicable to both the wet inversion development and the magnetic brush inversion development, and produces a negative-positive image having a satisfactory reproducibility particularly with respect to the solid image area thereof.

Abstract: In an exemplary embodiment, a charge image resulting from x-ray exposure of a plate originally charged to 1.5 to 5 kV, is developed by applying powder of opposite polarity while applying a voltage of from 1 to 4.5 kV, also of opposite polarity, to a conductive backing for neutralizing the effect of image background charge. A grid is spaced a small distance from the charge image and receives a voltage of about 1000 volts for controlling edge emphasis. For a positive charge image and negatively charged powder, a negative potential of e.g. -2500 volts may be applied to the backing for the photoconductive layer and +1000 volts may be applied to the grid.

Abstract: For improving the electrical contact between an insulating image carrier and a conductive support during development of an electrostatic charge image in electrographic recording processes a gas permeable support is used through which gas ions are brought to the back of the carrier while development takes place on the image side.

Abstract: A developing method and apparatus in which a developer supporting member is opposed to a latent image bearing member with a clearance therebetween and developer is caused to be transferred from the developer supporting member to the latent image bearing member to effect development and wherein a first and a second developing portion are provided as the developer supporting member, these effect development in the named order to complete the developing step, a first alternating bias for causing the developer to be transferred so as to mainly develop the image end portion of the latent image is imparted to the first developing portion, and a second alternating bias for causing the developer to be transferred so as to mainly effect the development for reproducing the tone of the latent image is imparted to the second developing portion.

Abstract: A device for use in developing a latent electrostatic image formed on the image bearing surface of an electrophotographic belt as the belt is moving through an arcuate path includes a container having a quantity of liquid toner. The container includes a top wall that has a centrally located slot and that is shaped to conform to the shape of the top wall. A development electrode is located on the top surface of the top wall. A feed roller is rotatably mounted in the container and positioned so as to project out slightly from the slot in the top wall. In use, the container is positioned with the top wall close to and parallel to the arcuate path of travel of the belt and the feed roller close to but not touching the belt. As the feed roller rotates, liquid toner is brought up close to the belt at which location the toner particles dispersed in the liquid toner are electrically attracted to and deposit on the charged portions of the belt.

Abstract: My invention comprises an improved method of electrophotography which enables me to increase the effective speed of a photoconductor. The speed at which copies may be made is a function of the quantum of light falling on the photoconductive surface and the conductivity of the photoconductor under illumination. Since the rate at which a given photoconductor discharges the surface potential on the photoconductor through the action of light is limited, speed can be increased for a given photoconductor only by increasing the illumination. This requires energy and produces heat. My process deliberately underexposes a charged photoconductor to a light and shade image of the original to produce a weak latent electrostatic image of low contrast which is insufficient to make a satisfactory copy. I then mask the latent image with a liquid-carried toner while preventing deposition of the toner on the background areas. I then discharge the background areas with a blanket illumination of low intensity.

Abstract: A xerographic developing device for depositing xerographic toner upon an image carrying medium without the use of toner carrier beads which includes an applicator roller for transferring toner from a tray towards the image carrying medium via a scraper element mounted at the exit opening of the tray. Improved regulation of the quantity of toner transferred in this manner is achieved by applying a DC-voltage potential between the applicator roller and the scraper.

Abstract: A system for producing lithographic printing plates by image transfer from either a right way or a wrong way reading recording member, which comprise a conductive base having first and second register means thereon the register means being arranged and positioned respectively so that the first engages and locates an image receiving member and a recording member on the base and the second engages and locates an offset member on the base, the register means being spaced apart to allow access to the first register means while the offset member is engaged on the second register means, a roller having at least a conductive core arranged to move over the base outwards from the register means and return, and means to apply an electrical field between the roller and base and to change the polarity to prevent electrostatic image transfer during the outward movement of the roller and to cause electrostatic image transfer during the return movement of the roller.

Abstract: A development electrode arrangement located in closely-spaced parallel relation to the charge retaining surface of a moving electrographic recording medium. A toner application unit feeds electrostatically charged toner particles into the space between the development electrode arrangement and the charge retaining surface of the recording medium. The development electrode arrangement is comprised of an array of electrode segments each segment being electrically isolated from each other segment and each segment being allowed to float electrically. The floating electrode segments are so arranged that every element of the recording medium that is subjected to the toning process passes over at least one electrode segment during the toning process.

Abstract: Apparatus for developing latent images of X-rayed objects on dielectric receptor sheets has a carrier which advances receptor sheets along a circular path about a horizontal axis. A tank with an open top is installed below the six o'clock position of the carrier and contains a horizontal developing electrode having narrow elongated channels extending in parallelism with the axis of the carrier. A pump draws liquid developer from a vessel in which the tank is confined and admits the developer into the bottom zone of the tank wherein the developer rises to fill and flow above the channels of the electrode and to thereby contact the latent image of a sheet on the moving carrier. The surplus of liquid developer overflows the upper edge of the tank and returns into the vessel. The electrode is movable up and down by rotary eccentrics to thereby influence the development of latent images, especially the development of outlines of dark portions of the images.

Abstract: A photographic apparatus for producing a visible image of an original on a photosensitive film mounted on a slide mount. The apparatus has a supporting structure for supporting a film at a processing position, a film supplying apparatus for supplying a film to the processing position, a processing unit to travel across the film held at the processing position and an optical system for projecting an image of the original onto the processing position. The processing unit includes a charger, exposure window, developing device, drier and a film kicker. The film held at the processing position is charged, exposed, developed and dried during the forward movement of the processing unit and is discharged from the processing position during backward movement of the processing unit by the kicker.

Abstract: A method for developing an electrostatic latent image and an apparatus therefor, in which a magnetic toner layer is formed on an arcuate face formed from an insulator, and an electrostatic latent image carrying medium is supported such that its electrostatic latent image surface contacts lightly with a part of said magnetic toner layer.