Abstract: An automatic document conveying device comprises a document table on which documents are placed; a vacuum separating/feeding means for feeding the set documents placed on the document table; a set document stopper for positioning the front ends of the documents placed on the document table; and a discharged document stopper for restraining the movement of the document discharged onto the set documents after being fed by the vacuum feeding means and subjected to image processing. A first opening and a second opening are provided in the document table. The vacuum separating/feeding means is disposed below the first opening. A feed drum connected to the vacuum chamber of the vacuum separating/feeding means via an opening/closing means is disposed below the second opening.

Abstract: An apparatus for compressing text data generated in advance uses character data defined in a code table. The apparatus includes a word extractor which extracts words to be coded from the words in the text data; a code allotter which allots a code to each extracted word that is defined in the code table and different from the codes allotted for the character data; a dictionary generator which generates a dictionary for defining a correspondence between the extracted words and the respective codes allotted to the extracted words; a code replacer which replaces the extracted words with their respective allotted codes to compress the text data; and a storage device which stores the generated dictionary and the compressed text data. The data amount for each text is reduced to improve the storage efficiency of a memory.

Abstract: A light source drive controlling device for use in an image forming apparatus is provided for controlling a light source for illuminating a surface of a document wherein the light amount of the light source is adjusted in accordance with a level of drive voltage supplied thereto by a light source driving device for supplying a drive voltage of a specified level to the light source. A scanning mechanism for moving the light source to and from a home position and a return position whereat scanning is completed moves the light source through an image reading start position whereat scanning an image of the document begins. A drive voltage supply timing controller varies a drive voltage supply start timing for applying the drive voltage to the light source in accordance with the level of drive voltage such that the light amount of the light source reaches a predetermined level when the light source reaches the image reading start position.

Abstract: A color image-forming machine 08/715 000 includes a color image signal-forming device for outputting digital signals Cd, Md and Yd expressing, on tone levels, the three primary colors C, M and Y for a number of pixels, and a masking device for correcting the digital signals Cd, Md and Yd in compliance with masking operation expressions. A color region discrimination device is provided to discriminate, based on the digital signals Cd, Md and Yd, to which one of a plurality of predetermined color regions each of a number of pixels belong. The masking device corrects the digital signals Cd, Md and Yd by selecting different masking operation expressions depending upon each of the plurality of color regions.

Abstract: This invention relates to an image forming apparatus provided with a punching unit and a paper refuse collecting box (container). The apparatus has a controller provided with a counter and monitor. The counter counts the total number of binder holes formed in paper by a punching operation by multiplying the number of sheets of paper to be punched by the punching unit with the number of binder holes formed in one sheet of paper that is designated by an operator. The monitor converts the total number of binder holes calculated by the counter into the amount of paper refuse accumulated in the container each time the punching operation is finished, while integrating the amount of paper refuse accumulated in the container. When it is judged that the integral value exceeds a predetermined maximum value, the controller causes a display device to display the necessity of emptying the container.

Abstract: A color correcting device and a color correcting method in an image forming apparatus such as a color copying machine that rely on, a correction factor in a masking equation which is previously found for each predetermined hue range. It is judged which of a plurality of predetermined hue ranges corresponds to a hue corresponding to input data composed of color data in a plurality of colors. The input data is subjected to color correction using a masking equation using a correction factor corresponding to the judged hue range.

Abstract: A communications method is provided for performing a rational priority processing according to the urgency of an interrupt transmission when an interrupt transmission command is supplied while a multi-address communication or a multi-polling reception is performed. The priority order of the processings is decided based on whether the interrupt command requests a direct transmission or a memory transmission. When the interrupt is the direct transmission, the interrupt is given priority. When the interrupt is the memory transmission, the multi-address communication or the multi-polling reception is given priority. In the interrupt transmission requesting the memory transmission, after an original for the interrupt transmission is read out and stored in a memory, the multi-address communication or the multi-polling reception is continued, and after the communication is completed, the data of the original for the interrupt transmission stored in the memory is transmitted.

Abstract: An apparatus and method for color image adjustment which ensure proper saturation adjustment by a simple process. Color image data for three primary colors are adjusted so that the sum of the color image data for the three primary colors is kept unchanged before and after the adjustment. Thus, the saturation adjustment can be achieved without a change in the brightness of an image.

Abstract: An ink ejecting device includes an ink ejecting member having an ink chamber and a nozzle at a specified position thereof; an ink ejecting driver for reducing the volume of the ink chamber to eject out ink from the ink chamber through the nozzle; and a controller connectable to an image data generator generating image data indicative of a plurality of densities for controlling the ink ejecting driver to regulate the volume reduction of the ink ejecting chamber in accordance with image data. Ink is ejected at an amount corresponding to image data indicative of a density. An image having a gradation can be printed at a high speed accurately and clearly with a simplified construction.

Abstract: In the present invention, a transmission control procedure from the time when a calling facsimile receives a digital identification signal from a called facsimile to the time when the calling facsimile transmits a facsimile message is carried out by control signals using tone signals. For example, the calling facsimile sends out to the called facsimile a first control signal indicating that facsimile transmission should be performed through a particular procedure if it receives the digital identification signal from the called facsimile. The called facsimile sends to the calling facsimile, if it receives the first control signal, a second control signal indicating that the first control signal is received. The calling facsimile sends out to the called facsimile a third control signal indicating that a facsimile message should be sent and then, sends out the facsimile message to the called facsimile if it receives the second control signal.

Abstract: A method and device for renewing an internal program of an apparatus capable of communication with a central station operable to transmit a new apparatus control program. It is determined whether data received from the central station is a new program. Replacement is then executed of a previously stored program with the new program, if a new program is received. A previously stored internal program is automatically overwritten by a new program transmitted from the central station.

Abstract: According to the present invention, in the image forming apparatus in which so-called "cleaningless" is realized, no problems such as traces of paper powder, gray or foggy stripes and the like occur in a formed image. The image forming apparatus is provided with a brush for scratching toner remaining on the surface of the photosensitive drum and recovering paper powder adhering on the surface thereof. When the length of the brush extending from the root thereof to the photosensitive drum is taken as a?mm!, the length of the toughening member, toughening the brush materials, projecting from the root of the brush materials is taken as c?mm!, and the length of the portion of the brush, cutting into the photosensitive drum, is taken as b?mm!, the relationship among a?mm!, b?mm! and c?mm! satisfies the conditions that 0.3.ltoreq.(c/(a+b)).ltoreq.0.95, 0.1 ?mm!.ltoreq.b.ltoreq.1.5 ?mm!, and (a+b)<2 ?mm!.

Abstract: Numerous projections are formed on the surface of toner particles by fine particles which are added to a monomer when preparing spherical toner particles by a suspension polymerization. Alternatively, spherical toner particles may be deformed when they are aggregated together with inorganic matter, and then the inorganic matter is chemically removed. The electrophotographic toner produced by deforming spherical toner particles has a narrow particle size distribution, reduced particle size, and excellent flowability. This improves the cleaning properties of the resultant toner, which can be scraped off the photoconductive drum using a cleaning blade.

Abstract: An ink ejecting device for use in an ink jet printing apparatus, includes: a number of ejecting elements arranged in a matrix having a first number of columns and a second number of rows, each ejecting element having: an ink chamber whose volume is changeable, an ejection nozzle communicating with the ink chamber, and an ink supply hole communicating with the ink chamber, and an piezoelectric conversion element, a drive portion for driving piezoelectric conversion elements of each column in a manner for expanding the ink chamber to allow ink to flow into the ink chamber and contracting the ink chamber to eject ink from the ink chamber through the ejection nozzle.

Abstract: The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1): ##STR1## wherein R.sup.1 is an alkylene group having 2 to 4 carbon atoms; and R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and indicate a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group or an aralkyl group or the like. This photosensitive material is improved in sensitivity, and is also superior in adhesion to conductive substrate as well as mechanical strength such as wear resistance, etc.

Abstract: A sheet member conveying mechanism, including a conveying guide for guiding a sheet member from a paper feed port to a paper discharge tray, a forwarding roller disposed on the most upstream side of the conveying guide, and a paper feed roller disposed on the downstream side of the forwarding roller to convey sheet members, forwarded by the forwarding roller, downstream one by one. An upper part of the outer peripheral surfaces of each of the forwarding roller and the paper feed roller is exposed above the upper surface of the conveying guide. The uppermost site of the paper feed roller is located at a lower position than the uppermost site of the forwarding roller.

Abstract: A scorotron charger has a charging wire extending in a specified direction supported in a housing member including a pair of side walls each extending in a direction parallel to the charging wire. An electrode member having a U-shape in cross section is mounted in the housing member and has a bottom plate in the form of a a grid electrode and a pair of upright side plates extending along the charging wire. A plurality of cutouts are formed in the side plates and are so arranged that positions of the cutouts in one side plate are displaced from that of cutouts in the other side plate. A plurality of projections are formed on the side walls of the housing member at positions corresponding to the respective cutouts for engaging with the cutouts.

Abstract: The present invention provides a tryptoanthrinimine derivative represented by the general formula (Y): ##STR1## wherein R.sup.A to R.sup.M are as defined. Such a derivative of the general formula (Y) is superior in electron transferring capability. Accordingly, an electrophotosensitive material comprising a photosensitive layer containing this derivative (Y) is superior in sensitivity.

Abstract: An image-forming apparatus for forming image through the electric charging of a photosensitive material drum, exposure to light, developing and transfer, wherein a developing device also works to clean the toner remaining on the photosensitive material; an electric charge for effecting the electric charging has a scorotron charger located within .+-.45.degree. from a perpendicular downwardly drawn from the center of the photosensitive material drum, and has a hole on the side opposite to the opening for charging; and an electric field E.sub.1 between a wire and a grid in the scorotron charger is set to be stronger than an electric field E.sub.2 between the wire and a shield.