Abstract: A toner fixing apparatus characterized by provision of a provisional fixing portion provided with a provisional fixing component having an infrared heater irradiating infrared radiation onto a printed surface of the web and a main fixing portion provided downstream in the web flow in the provisional fixing portion and nipping the web with heat rollers performing a main fixing operation or having a plurality of main fixing units. According to this invention, a toner fixing apparatus and an electrophotographic printing device including the toner fixing apparatus are provided which display excellent fixing properties during multicolor image formation, excellent heating efficiency and excellent economy with respect to installation space.

Abstract: [Problem to be Solved] To provide an inkjet recording apparatus capable of adjusting a gap with high accuracy and easily. [Solution] The present invention provides an inkjet recording apparatus 100 including line heads 20 to 23 capable of recording on a recording medium 1, a head box 11 that houses the line heads 20 to 23, and gap adjustment cams 30 to 32 that abut on a lower surface of a bottom 11b in the head box 11, in which the head box 11 is slightly movable in an up-and-down direction by rotating the gap adjustment cams 30 to 32.

Abstract: A digital sheet-fed printing method includes providing one cycle of printing to print on a series of sheets of paper whose number is equal to the least common multiple of respective numbers of allocated positions; producing a reference signal on the basis of which an image in each color is printed on the sheet of paper; detecting with an image detection sensor means a mutual out of register between images in different colors printed on each sheet of paper in the series, furnishing the printing control means with a detection signal for each sheet of paper from the image detection sensor, and correcting the timing at which each image is printed on each sheet of paper in one cycle of printing so that timings to print the images in different colors on each sheet of paper coincide with one another; and printing images in the different colors.

Abstract: The present invention is an ink-jet recording apparatus 100 capable of carrying out printing continuously onto both surfaces of a recording medium 1, the ink-jet recording apparatus 100 having: a first unit 10a having a first ink-jet recording head 2a for carrying out printing onto a first surface la of the recording medium 1 and having a first drying drum 3apositioned below the first ink-jet recording head 2a and heating and drying the recording medium 1 after the printing; and a second unit 10b having a second ink-jet recording head 2b for carrying out printing onto a second surface 1b of the recording medium 1 and having a second drying drum 3b positioned below the second ink-jet recording head 2b and heating and drying the recording medium 1 after the printing.

Abstract: An electrophotographic printer includes a transfer roller cleaning device 12 and a carrier liquid supply unit 11 disposed at a portion of the circumference of a transfer roller 2 between a position of image transfer onto a recording medium 7 and the transfer roller cleaning device and including a carrier liquid supply roll 13 in rotational contact with a surface of the transfer roller. The transfer roller cleaning device comprises a cleaning roll 17 rotating in rubbing contact with the surface of the transfer roller and having a bias voltage applied thereto which is of a polarity opposite to that of a residual toner; a peripheral surface scraping blade 18 positioned downstream of the cleaning roll in the rotation direction of the transfer roller; a side surface scraping blade 19 likewise positioned downward; and a surface scraping blade 26 disposed at a portion of the circumference of the cleaning roll.

Abstract: A working apparatus for pasting two continuous paper webs together having patterns is provided which can be made small as a whole and whose pasting processing treatment reduces a paper loss occurring when the apparatus starts to operate.

Abstract: To remove a surplus carrier liquid after development on the surface of a photoconductor drum to obtain homogeneous printed images without being affected by an error in rotational accuracy of such as a carrier liquid removing roller, there is provided a wet type electrophotographic printer in which the carrier liquid removing roller 14 of a carrier liquid removing unit 8 is caused to come in rotational contact with the photoconductor drum 1 to remove a carrier liquid from the liquid toner image, thereby making a toner image for transfer onto a recording medium 7, the wet type electrophotographic printer being so configured that the carrier liquid removing roller in rotational contact with the photoconductor drum is urged against the latter under an urging force made adjustable; and a scraping blade 23 is brought into contact with the carrier liquid removing roller while being urged against the latter under an urging force made adjustable.

Abstract: An apparatus for making a booklet-like product comprises a paper feeding part; a superposing part for superposing a plurality of continuous webs of paper fed to travel from the paper feeding part, whereby a layered continuous sheet of paper is prepared; a cutting part for cutting the layered continuous sheet into successive separate layered sheets of paper; a conveyance passage; and a stacking and ejection part for causing the separate layered sheets traveling along the conveyance passage to be piled every predetermined number thereof and to be ejected in the form of piles of sheets, each to form the booklet-like product. The superposing part is provided with a paste nozzle for applying paste to one of two adjacent such continuous webs of paper on its one side and a further paste nozzle for applying paste to the upper surface of the layered continuous sheet.

Abstract: In an ink jet printer having a plural number of line heads arranged in a paper printing direction, it is sought to render the printing density high in the nozzle row direction without the need to exchange the line heads. The invention provides an ink jet printer in which line heads other than at least one of the line heads 3 are each displaceable by a distance that is equal to a part per the plural number of a nozzle pitch in the line head in a direction of the nozzle row.

Abstract: A toner-fixer apparatus 1 used in an electronic photograph printer includes: an apparatus main unit extending along a web fed in the electronic photograph printer; a hot-air-blower section having air ejection ports for blowing hot air onto the web; and an air-exhaust section for suctioning air into air exhaust ports having openings on the apparatus main unit opposed to the web. In this configuration, the toner-fixer apparatus obtains capabilities in terms of fixing toner used in a multi-color image, thermal efficiency, environmental load, and space saving.

Abstract: A duplex printing apparatus designed and adapted to efficiently print on both surfaces of a web of paper using a single digital printer.

Abstract: Images, one per page, are printed by a digital printer consecutively on a web of paper fed to travel forward. A timing mark is printed for each image. In case printing is temporarily halted, the web of paper is first fed backward, and then it is fed forward again. The number of timing marks in each of the backward feed and forward feed of the web of paper are counted. When the number of counts of the timing marks counted in the forward feed coincides with the number of counts of the timing marks counted earlier in the backward feed, printing of consecutive images is reinitiated from a position immediately following an image last printed before printing was temporarily halted.

Abstract: An electronic photograph printer is provided for elastically biasing the developer apparatus having the photosensitive drum by the pressing mechanism and for pressing the developer roll onto the photosensitive drum. In this configuration, quality in the developed image can be ensured by the trackable movement of the developer roll relative to the photosensitive drum in the electronic photograph printer. In addition, adjustable range for positioning the developer roll and operability and maintainability within the developer apparatus can be achieved.

Abstract: An electrophotographic apparatus that can effect favorable transfer of a toner image onto a medium under a nip pressure between a transfer roller and a backup roller and a potential difference between the transfer and backup rollers even if the medium has a high insulating property, such as due to its being thick.

Abstract: A sheet-fed duplex and a sheet-fed duplex multi-color printer which is compact, using an electrophotographic printing system. For a long image to be printed on both faces of a sheet of paper, the printer enables producing printed matter at high efficiency and high precision, and yet when printing front and rear faces of a sheet of paper in succession the printer is able to prevent a printing face of the sheet of paper printed on upstream in its conveyance direction from becoming soiled by toner transferred from a printing face of the sheet of paper printed on downstream in its conveyance direction.

Abstract: A wiping apparatus for a print head for wiping a head surface of the print head by rubbing the same with a blade is provided that includes a wiping box having a top open area; a blade support having the blade fastened thereto and disposed in an upper part of the wiping box so as to be rotatable between a wiping position at which a tip of the blade points upwards and a storage position at which the tip of the blade points downwards; leakproof plates fastened to the blade support for closing the top open area of the wiping box while the blade is in a state of the storage position; and a cleaning liquid nozzle disposed in the wiping box so that it is directed towards the blade in the storage position.

Abstract: A method of correcting print images in an electrophotographic printer wherein an image formed by a print head (3) on a peripheral surface of a photoconductor drum (1) is transferred and printed on a sheet of paper. The method comprises: furnishing the print head with a standard tacho signal in the form of pulses and thereby printing on a sheet of paper a check mark (9) for each given number of pulses of the standard tacho signal while the photoconductor drum makes one rotation; by means of a camera (10), detecting a periodic deviation in each spacing between successive such check marks; in response to the deviation in each spacing between the successive check marks, varying the pulse width of pulses of the standard tacho signal for each spacing between the successive check marks, thereby to provide a modified tacho signal; and effecting printing thereafter based on the modified tacho signal.

Abstract: A sheet-fed duplex printer comprises a pair of impression cylinders 6a, 6b and first and second electrophotographic printing units 7a and 7b. Each of the cylinders is provided on a peripheral surface thereof with a paper gripper for gripping a sheet of paper. The cylinders and printing units are so disposed relative to each other and suitably operated for printing on one face of the sheet of paper as it is conveyed following the peripheral surface of one cylinder, and for printing on the other face of the sheet of paper as it is conveyed following the peripheral surface of the other cylinder. This arrangement allows high precision and high speed printing of a sheet of paper large in size without increasing the entire apparatus length.

Abstract: An ink jet recording apparatus in which a head supporting plate having a line head mounted thereon which comprises a plurality of short heads staggered is attached to a carriage whereby recording is performed by ink jet printing with the line head on a recording medium positioned beneath the carriage is rendered capable of using ordinary short heads.

Abstract: A toner supplier apparatus 1 is provided for stabilizing the concentration of toner reserved in a main tank. A concentration sensor for measuring the concentration of the toner is provided in a toner-feeding pipeway for supplying liquid toner from a main tank for adjusting the concentration to the developer apparatus. High concentration toner and diluent supplied to the main tank are controlled based on the concentration measured by the concentration sensor. Accordingly, accuracy of the toner supplier apparatus used for an electronic photograph printer in measuring the concentration of the toner can be improved, thereby permitting accurate control for the concentration in a printed image.