摘要:
A personal computer has a print image developing means and a data compression means including a fixed rate compression. A color printer has a data extension means, a color correction means, a gamma correction means, a first halftoning means, an image area segmentation means, and a second halftoning means. The transmission time of a print image can be shortened necessarily to less than a constant time, and further, since an enormous memory for extension is unnecessary, a low cost printer can be provided.
摘要:
The disclosure is concerned with an electrophotographic apparatus comprising a toner image supporting member on which a toner image developed on an electrostatic latent image is formed, transferring means for transferring the toner image on said toner image supporting member to a recording medium, conveying means for bringing the recording medium into contact with the image supporting member, a fixing roller and a compression roller in contact with each other to fix the toner image on the recording medium, heating means disposed inside at least one of the fixing roller and the compression roller, wherein there are provided temperature detection means for detecting the surface temperature of the fixing roller and state detection means for detecting the state of the fixing apparatus before starting of the fixing apparatus.
摘要:
An outer peripheral length of an intermediate transfer drum of a color laser beam printer is constituted in which a number of a beam detection signal obtained by one rotation of the transfer drum is formed as an integral number of a face number of a polygon mirror. A passing-through detection means detects the passing-through of a specified position mark on a photosensitive body belt and is provided on the photosensitive body drum at predetermined position. An image data requirement signal generating means controls a generating timing of an image data requirement signal for forming a toner image by the passing-through detection signal. A scanning line at a raster direction based on the beam detection signal after the transfer drum has rotated at one rotation returns and overlapped on a scanning line position formed on the first beam detection signal as a standard. A plural toner images having a different color each are formed on the transfer drum without color offset.
摘要:
An intermediate transcription drum is supported so as to be driven in contacting relationship with a photosensitive belt. The rotating speed of the photosensitive belt driving motor is controlled by a control unit such that one rotation cycle of the intermediate transcription drum becomes a given cycle. An adjustment of the speed control data for the photosensitive belt driving motor is performed in the interval between electrostatic latent image forming. Thereby, a speed difference between the photosensitive belt and the intermediate transcription drum does not occur, and a plurality of the toner images can be transferred and accurately superposed onto the outer surface of the intermediate transcription drum.
摘要:
A color electrophtographic printer has: a photosensitive drum on which electrostatic latent images are formed according to print data separated by colors; a plurality of developing units each including a developing powder container accommodating a two component developing powder formed by mixing carriers and toners, an apparatus for agitating the developing powder, and a unit for supplying the toners in the developing powder container; a unit for selecting one of the plurality of developing units according to color to be developed and for activating the same to develope the corresponding electrostatic latent image formed on the photosensitive drum; and a control unit for controlling the respective operations. A control unit is further provided for counting colored print data dots contained in print data for respective colors and for additionally activating the developing powder agitating prior to a subsequent developing operation for any of the developing units which have experienced developing of the electrostatic latent images formed with colored print data dots in excess of a predetermined count.
摘要:
A color electrophtographic printer has a photosensitive drum on which electrostatic latent images are formed according to print data separated by colors; a plurality of developing units each including a developing powder container accommodating a two component developing powder formed by mixing carriers and toners, an apparatus for agitating the developing powder, and a unit for supplying the toners in the developing powder container; a unit for selecting one of the plurality of developing units according to color to be developed and for activating the same to develope the corresponding electrostatic latent image formed on the photosensitive drum; and a control unit for controlling the respective operations. A control unit is further provided for counting colored print data dots contained in print data for respective colors and for additionally activating the developing powder agitating prior to a subsequent developing operation for any of the developing units which have exprienced developing of the electrostatic latent images formed with colored print data dots in excess of a predetermined count.
摘要:
An electrophotographic imaging apparatus includes a toner image holding body, a transcription unit for transcribing the toner image on the toner image holding body onto a recording medium, and a conveyor for conveying a recording medium toward the toner image holding body and transcription unit. A judging device will judge whether printing is of a first page or not and if it is decided that printing is to be performed on a first page, a first measuring device will measure the electrical characteristic of the toner image holding body prior to the feeding of a recording medium and a transcription voltage will be set depending of this measured result. Thereafter, the recording medium will be conveyed toward the transcription unit where the electrical characteristics of the non-printing region on the recording medium will be measured via a second measuring device and the transcription voltage will be further adjusted. If it is judged that the recording sheet is not the first sheet, only the second measuring and adjusting will be performed. In this manner, transcribing of a toner image can always be performed regardless of the kind of paper being used and/or changes in the environment (temperature, humidity) and a high transcribing efficiency can be attained.
摘要:
A substrate transfer apparatus comprising: a plurality of floating-transfer guide plates adjacent to each other with a space, each of guide plate having a plurality of floating gas ejecting holes; a gas supplying source for supplying a floating gas to the guide plates; a tray that is placed on one of the guide plates in order to mount a substrate to be transferred, and that is floated by the floating gas; and a transfer arm for transferring the floated tray to the adjacent other guide plate from the guide plate, wherein the tray includes a main body portion having both side edges parallel to a transfer direction of the tray, and an outward projecting portion that is formed so as to partially project outwardly from at least one of both side edges of the main body portion, and wherein the transfer arm is in contact and engaged with the outward projecting portion when the tray is transferred by the transfer arm.
摘要:
Image forming apparatus having a photosensitive drum 1, a charger 2 for uniformly charging the photosensitive drum 1, an exposing means 3 for forming an electro-static latent image on the photosensitive drum 1, an exposing unit 4 for forming a visual image by developing the electro-static latent image, a transfer roller for transferring the visual image to a printing medium 10, which comprises a transfer voltage supply circuit that supplies the transfer roller 5 one or more times with voltage in one polar direction and successively in the other polar direction during an interval after starting of operation of the image forming apparatus and before the time when the printing medium 10 is transported to the transfer roller 5. By controlling in such a way, an image forming apparatus is provided in which memory effect does not arise, the transfer roller 5 being prevented from having accumulated toner attached thereto, the toner attached to the transfer roller 5 being cleaned, and so the reverse side surface of the printing medium 10 is not stained.
摘要:
The present invention relates to a desk-top type color electro-photographic apparatus which is easy in use, small in size and light in weight, wherein maintenance such as changing its photosensitive member can be performed by a user and color adjustment is performed with high accuracy of less than 100 .mu.m. Developing units for four colors are placed in a rank, a single endless-belt-shaped photosensitive member being placed below them to form an approximately oval shape, the photosensitive member being touched with a transfer member on its major axis side to transfer each color of images. In addition to this, the photosensitive member is employed a cartridge type for easiness of user's maintenance and constructed such that highly accurate positioning between the body of apparatus and the cartridge can be performed. Effect of the eccentricity of pulleys is decreased by means of making the pulleys wrapped with the photosensitive member have the identical diameter and making the diameter of the transfer member integer times as large as that of the pulley.