Abstract: A liquid developer imaging system and a method using the system for developing an image, including a cartridge for containing a developing solution; a developing container for receiving the developing solution supplied from the cartridge via a predetermined supply line; a developing roller partly submerged in the developing solution contained in the developing container, installed to be rotated facing a photosensitive object; and a metering blade for scraping off the developing solution coated on the surface of the developing roller to a predetermined thickness, is provided. According to the system, a developing supply structure can be considerably simplified because a high-density developing solution is directly used in developing an image without a process of diluting the solution, and an image can be developed to have high definition because the concentration of the developing solution coated on the developing roller is regularly controlled by a metering blade.

Abstract: An ink feeding valve of a wet type electrophotographic printer, capable of basically preventing operational error and incapability of valve due to ink attachment, includes: a valve body having a pipeline for interconnecting the concentrated ink tank with the developing solution tank; a rod assembly disposed in the pipeline of the valve body so as to be vertically moved for selectively opening/closing the pipeline; an elevating section for vertically moving the rod assembly; and a corrugated tube disposed in the pipeline of the valve body for partitioning the pipeline into an inner ink passage and an outside elevating section operating chamber, and for preventing ink flow into the elevating section operating chamber. Since the ink passage and the elevating section operating chamber are isolated from each other by the presence of a corrugated tube, the plunger and spring located in the elevating section operating chamber are efficiently operated without having problems caused due to ink attachment.

Abstract: A photosensitive belt removing device and a photosensitive belt removing method of an electrophotographic printing apparatus are disclosed.

Abstract: A photosensitive belt cartridge includes a cartridge body substantially in the shape of an ovoid whose one end is open to receive the photosensitive belt in an endless track thereto. A plurality of spring plates, whose respective ends are fixed on ends of inner wall of the cartridge body, are arranged on the inner wall of the cartridge body along the endless track of the photosensitive belt at certain intervals, for supporting the photosensitive belt in cooperation with the inner wall of the cartridge body. An inner cover is used which is disposed at an open portion of the cartridge body for supporting edges of the photosensitive belt, and also for supporting the ends of the plurality of spring plates, for preventing partial loosening of the photosensitive belt. Further, the cartridge body includes a guiding rail formed on the upper surface, which has a pair of outwardly-bent locking ribs which are slidably fit into the advancing rail of the belt unit.

Abstract: There are provided a method for controlling the mode of a developing station of a liquid electrophotographic printer and a development roller driving apparatus therefor. In the controlling method, a printing mode, a drip line removal mode and a home mode are sequentially performed, and a development roller is subjected to racing in the home mode to be cleaned. Since the development roller is cleaned in the home mode in which the development roller is spaced apart from a photosensitive belt, the photosensitive belt is not contaminated by the development roller while cleaning the development roller. Also, the cleaning of the development roller is performed after completing a drip line removal mode, so sufficient cleaning time can be obtained.

Abstract: An apparatus and a method of removing a photoreceptor belt from an electrophotographic printer are provided. The apparatus includes at least one pair of rollers for pressing and transferring the photoreceptor belt circulating in a predetermined traveling track, a cutting blade capable of cutting the photoreceptor belt while moving across the photoreceptor belt, a cylindrical member rotatably installed in a filter housing disposed near the photoreceptor belt, the filter housing having a filter cartridge for filtering foreign material of the inner air of the printer, and a driver for rotating the cylindrical member such that the photoreceptor belt is wound around the cylindrical member. The photoreceptor belt is cut and automatically drawn from the traveling track into the filter housing. The cut photoreceptor belt is removed together with the filter cartridge installed in the filter housing.

Abstract: In an apparatus for elevating a squeeze roller of a liquid developing apparatus, a sub-block having the squeeze roller selectively pressing a photoreceptor web installed thereon, is installed at a main block of the liquid developing apparatus to be capable of moving up and down. A mobile block is installed at the main block to be capable of moving up and down to support the sub-block. The mobile block is moved up and down by an elevating unit to allow the squeeze roller to contact or be separated from the photoreceptor web. A piezoelectric element is installed at the mobile block to support the sub-block and to move the sub-block up and down in a predetermined range by being reversibly transformed by electric current. A power supply selectively provides electric current to the piezoelectric element. Thus, the decline over time of the elastic force of the spring employed in the conventional elevating apparatus can be fundamentally solved.

Abstract: An air circulation system for a liquid-type electrophotographic printer. The air circulation system circulates air in the printer and discharges the air to the outside. The printer includes a developer unit for developing a predetermined image onto a photoreceptor belt, a drying unit for drying the developed image, and a transfer unit for printing the dried image on a paper.

Abstract: An electrophotographic printer including: a photosensitive belt moving along a circular path and supported by a plurality of rollers; a main corona device for increasing an electrical charge potential on a surface of the photosensitive belt to a predetermined level for development; first, second, third and fourth laser scanning units for forming an electrostatic latent image on the photosensitive belt by color; first, second, third and fourth developing units for individually developing the electrostatic latent image using first, second, third and fourth developing solutions of different colors; a drying roller pressing the photosensitive belt for removing carrier from the developing solutions developed on the photosensitive belt, the drying roller being frictionally charged positively through contact with the photosensitive belt; an eraser for removing an electrostatic charge remaining on the photosensitive belt after development to uniformly electrify the surface of the photosensitive belt with exposing cha

Abstract: A paper ejecting apparatus embodied in a printing system, such as a video color printer, that is constructed to push out or eject a printed sheet of paper. The apparatus includes long guide channels formed in a panel for feeding paper toward an ejecting direction, a pusher movable along the guide channels, a rack gear member connected to the pusher, a guide support member for movably supporting the rack gear member, and a driving source for driving the rack gear member having a pinion driven by the driving source. Also, components are added to the driving source for preventing overload thereof. The operation of the apparatus is smooth, so that the paper is securely ejected without being damaged, and the apparatus is simple in structure and causes little mechanical noise.

Abstract: A video printer according to the present invention comprises a video processor, a printer processor, a display circuit and a control circuit. The display circuit comprises an encoder for encoding a print control signal, a bar displaying memory for generating a print processing display bar signal, a converter for converting the output of the bar display memory into an analog signal, a timing pulse generator for generating an RGB enable switching signal and bar display enable signal and a switching circuit for output of a print processing display signal to produce a flashing indication of a corresponding mode. A print processing display method is also described for storing a horizontal bar and characters, generating a printing status signal, displaying on a monitor the stored horizontal bar and characters according to the printing status signal, and flashing a corresponding function section of the bar in accordance with the current status of the print processing.