摘要:
A method of and apparatus for synchronously transferring an original and a sheet of copying paper for electrostatic photoduplication. A paper feeding device feeds the sheets of copying paper one at a time until the front edge reaches a predetermined position at a front edge stop. The sheet of copying paper is held at the predetermined position on standby for a period of time, and then a paper transfer device transfers it to move the front edge to an exposure point. At the same time an original placed on a mount is moved from a stopping point in the cycle of movement of the mount to a position in which the leading edge of the original is at an irradiation point optically aligned with the exposure point. The period of time during which the copying paper is fed from the supply, held in the predetermined position, and then moved to the exposure position is equal to the time for moving the mount for the original from a predetermined point along the path of movement of the mount to the irradiation point. Thereafter, the original is moved past the irradiation point synchronously with transfer of the copying paper past the exposure point at a predetermined rate for exposing the copying paper to the image from the original.
摘要:
A switch device for an electrostatic photographic copying machine having a reciprocally movable member reciprocating from a rest position and returning thereto during each copying operation of the copying machine, and a drive driving the movable member. The switch device has an actuating member movable relative to the copying machine body and is toward a non-operating position. An operating member engages with the actuating member for moving it to an operating position. A retaining device engages the actuating member for holding the actuating member in the operating position after it has been moved to the operating position. A switch actuating the drive for the movable member is engageable by the actuating member for actuating the drive means when the movable member is in the operating position and actuating the switch for deactuating the drive when the movable member is in the non-operating position. A protuberant member movable with the reciprocally movable member engages the retaining device just prior to the return of the reciprocally movable member to the rest position after a reciprocating movement thereof for disengaging the retaining device from the actuating member, whereby when the retaining means is disengaged the actuating member is free to be moved to the non-operating position for actuating the switch for deactuating the drive.
摘要:
A transfer sheet on which toner images free of broadening of edge portions and having sharp contours can be transferred even in the electrophotography or electrostatic printing of the transfer type using conductive or semiconductive toners, i.e., magnetic toners, is disclosed. This transfer sheet is characterized in that a conductive or semiconductive toner-receiving face having a volume specific resistance of at least 3.times.10.sup.13 .OMEGA.-cm is formed on at least one surface of a substrate of the transfer sheet.
摘要:
An apparatus for developing an electrostatic latent image formed on the surface of an electrostatic latent image-bearing material by applying a powdery developer, wherein means are provided for bringing the surface of a developer-retaining member retaining a layer of the powdery developer thereon into rolling contact with the surface of the image-bearing material in such a relation that a reservoir zone of the developer is formed at least upstream of the zone of rolling contact between the two surfaces, and means are provided for physically disturbing the developer in the reservoir zone to cause the developer to make an irregular motion.
摘要:
A process for preparing a photosensitive material for electrostatic photography having an improved memory resistance, which comprises a photoconductive layer on an electrically conductive substrate, the photoconductive layer comprising (1) a finely divided inorganic photoconductor, (2) 5 to 50 parts by weight, per 100 parts by weight of the photoconductor of an electrically insulating organic synthetic resin binder having a specific resistance of at least 10.sup.14 ohm-cm, and (3) 0.001 to 1 % by weight, based on the photoconductor, of at least one photo-memory erasing compound selected from alkali metal dichromates, which process comprises forming the photoconductive layer by applying a coating composition to the electrically conductive substrate at a coating weight of 5 to 50 g/m.sup.2, the coating composition comprising the photo-memory erasing compound, the photoconductor, the resin binder, an aromatic solvent in which the resin binder is dissolved or dispersed, an a polar solvent for the photo-memory erasing compound, the polar solvent being soluble in the aromatic solvent and being selected such that the photo-memory erasing compound is soluble in said polar solvent.
摘要翻译:一种用于制备具有改进的记忆电阻的静电摄影用感光材料的方法,其包括导电性基板上的光电导层,所述光电导层包含(1)细碎无机感光体,(2)5〜50重量份, 每100重量份电阻率为至少1014欧姆 - 厘米的电绝缘有机合成树脂粘合剂的光电导体,和(3)基于光电导体的0.001至1重量%的至少一个光致抗蚀剂, 记忆擦除化合物,选自碱金属重铬酸盐,该方法包括通过以5至50g / m 2的涂层重量将涂料组合物施涂到导电基材上形成光电导层,该涂料组合物包含光记录擦除化合物, 光导体,树脂粘合剂,其中溶解或分散树脂粘合剂的芳族溶剂,ph的极性溶剂 所述极性溶剂可溶于所述芳族溶剂,并且选择为使得所述光记忆擦除化合物可溶于所述极性溶剂中。
摘要:
A contact heat fixing device which comprises a driving heated roller having a heating mechanism disposed in the interior thereof and a surface coated with an offset preventing material, a press roller which is rotated in intimate contact under pressure with said heat roller, a vessel for containing therein an offset preventing liquid and a feed mechanism for supplying the offset preventing liquid to the heated roller from the vessel, fixation of a toner image being accomplished by the passage of a support having the toner image thereon through the nip position of the heated roller and the press roller, wherein said feed mechanism includes an applicator for applying the offset preventing liquid to the surface of the heated roller and supply means for supplying the offset preventing liquid from the vessel to the applicator, said applicator being arranged so that it can shift between a position (PI) where it has a pressing contact with said supply means and a position (P2) where it has a pressing contact with said heated roller, in such a manner that the offset preventing liquid is supplied to said applicator when it is at said position (P1), the applicator is moved from said position (P1) to the position (P2) synchronously with feeding of said support to have temporary contact with the surface of the heated roller and apply thereto the offset preventing liquid, and the applicator is then returned to the position (P2).
摘要:
An improved process for the diazo-type multicolor reproduction which can give multicolored copies excellent in the hue separation and can increase the number of copies obtained from an original treated with a color-forming agent is disclosed. This improved multicolor reproduction process is characterized by the use of a color-forming composition comprising a thermo-volatile or sublimable coupler and at least one hue separation-improving agent selected from polyalkylene oxides and polyalkylene oxide derivatives which are solid under normal conditions and fatty acid derivatives having a melting point of at least 100.degree.C.
摘要:
A process for diazo-type multi-color reproduction by which portions of a sensitive paper corresponding to predetermined portions of an original can be colored selectively to different hues by disposing a layer of thermotransferable coupler between an original and diazophotosensitive paper followed by exposure to light and heating of the assembly. The layer of thermotransferable coupler is not applied to the entire image area of the original and the thermotransferable coupler is faster in coupling rate with the diazonium salt under the development conditions than the basic color coupler of the photosensitive paper or developing solution.
摘要:
A versatile electrostatic copying machine which can provide not only ordinary black-and-white and monochromatic copies and ordinary multi-colored copies but also artificial monochromatic and multi-colored copies of desired optional colors differing from colors of originals conveniently with ease without such troubles as color mingling and paper jamming is disclosed, said copying machine comprising an original-light exposing zone for irradiating an original to be copied in the stationary or moving state by a light source, a photosensitive layer-light exposing zone for light-exposing imagewise a statically charged photosensitive layer, an optical system for optically connecting said original-light exposing zone to the photosensitive layer-light exposing zone and projecting an image of the original on the photosensitive layer and a development mechanism for developing an electrostatic latent image formed on the photosensitive layer directly or after it has been transferred onto a transfer paper, wherein said optical system comprises a light-selecting mechansim for selecting an optional light from white light and color-separated lights and exposing the photosensitive layer to said selected light and an exposure light quantity-adjusting mechanism for adjusting the exposure light quantity to an optimum quantity with respect to each of a plurality of said lights, the development mechanism comprises a development operation-selecting mechanism for selecting an optional development operation among a plurality of development operations differing in the toner hue, and said light-selecting mechanism and development operation-selecting mechanism are actuated independently or in the state interlocked with each other so that a copy having a desired coloring effect can be obtained.
摘要:
A method for transferring a toner image on the surface of an image-bearing member obtained as a result of development with a conductive or semi-conductive toner material to the surface of a receptor member, which comprises bringing the surface of the receptor member into contact with the toner image on the surface of the image-bearing member and simultaneously applying a corona discharge to the back surface of the receptor member. The angle formed between the lines of electric force of the corona discharge and a line perpendicular to the receptor member does not exceed about 30 degrees.