An ink jet recording apparatus includes a conveying device for conveying a recording sheet, a first recording device for discharging ink to a first surface of the recording sheet conveyed by the conveying device to thereby record an image thereon, a second recording device for discharging ink to a second surface opposite to the first surface of the recording sheet conveyed by the conveying device, a first ink receiving device disposed at the first surface side of the recording sheet for receiving the ink discharged from the second recording device, and a second ink receiving device disposed at the second surface side of the recording sheet for receiving the ink discharged from the first recording device.

A fluid ejection system includes a first fluid ejection head comprising a first nozzle plate that includes a first set of fluid ejection nozzles capable of ejecting first fluid drops and a second fluid ejection head comprising a second nozzle plate that includes a second set of fluid ejection nozzles capable of ejecting second fluid drops. The second nozzle plate is substantially opposing to the first nozzle plate. The first set of fluid ejection nozzles are offset from the second set of fluid ejection nozzles.

A substrate guide and tensioning apparatus utilized with a printing system ensures the substrate does not flex or curl during printing to eliminate color mismatch among printed pixels. The printing system includes a scanner, a graphics computer, and a printer. The scanner optically scans an image and reduces it to a series of pixels represented in gray scale. After the scanner finishes converting the image into pixels, the graphics computer converts the gray scale representations of each pixel into a pixel conveying uniform density color information. The graphics computer then outputs the uniform density pixels to a print control system of the printer. The print control system receives the uniform density pixels and controls a printhead to print a reproduction of the image on a substrate suspended within the printer. Alternatively, the print control system controls a pair of printheads positioned on opposite sides of the substrate suspended within the printer to print a reproduction of the image on one side of the substrate and a mirror of the image on the opposite side of the substrate such that the images are in registry.

In a printing apparatus for performing a printing operation on both obverse and reverse surfaces of a continuous web paper with an ink jet printing machine, there is a construction having a first printing unit for printing on one surface of the continuous web paper and a second printing unit for printing on the other surface of the continuous web paper, in which the first printing unit and the second printing unit are arranged at an identical position in respective paths of travel of a first portion and a second portion of the continuous web paper as oriented in parallel to each other, as facing downwards and as shifted to each other in the direction perpendicular to directions in which the first portion and the second portion of the continuous web paper are traveling, and the path of travel of the first portion of the continuous web paper which is printed by the first printing unit and the path of travel of the second portion of the continuous web paper which is printed by the second printing unit are made continuous via a turning unit for turning the continuous web paper at a right angle twice therein.

The present invention pertains to the field of ink-jet printers used for color printing of large format articles. This invention is used for improving quality and for increasing the yield of printers and comprises successively applying primary colors, suppressing color aberrations when printing a semi-transparent material on both sides, precisely positioning the head when printing an image on the substrate and eliminating the lines connecting the carriage to the systems supplying control signals, air and inks. To this end, the carriage with the jet heads is moved in one direction along a closed guiding rail which is fitted with a hatched ruler for precise positioning, wherein the heads will thus bypass the substrate on both sides while information is transmitted from the device control unit to the carriage using a radio transceiver. The printer can further be (equipped With two independent and parallel substrate feeding systems for performing a one-sided printing on two substrates at the same time.