Abstract: An image recording apparatus is disclosed wherein an image is recorded on a recording medium based on image information by ejecting liquid droplets from a liquid droplet ejecting head. A liquid droplet ejecting head is provided which has an ejection region substantially corresponding to a width of the recording medium. A conveyor unit is provided which conveys the recording medium to the ejection region of the liquid droplet ejecting head with the recording medium attracted and attached thereto and supported thereon. The recording medium is fed from the conveyor unit to a paper discharge section. Further, a plurality of attracting and supporting sub-units are provided which are vertically moved with the recording medium, which is delivered thereto from the conveyor unit, attracted and attached thereto and supported thereon, thereby conveying the recording medium to a subsequent step.

Abstract: An image recording apparatus is disclosed wherein an image is recorded on a recording medium based on image information by ejecting liquid droplets from a liquid droplet ejecting head. A liquid droplet ejecting head is provided which has an ejection region substantially corresponding to a width of the recording medium. A conveyor unit is provided which conveys the recording medium to the ejection region of the liquid droplet ejecting head with the recording medium attracted and attached thereto and supported thereon. The recording medium is fed from the conveyor unit to a paper discharge section. Further, a plurality of attracting and supporting sub-units are provided which are vertically moved with the recording medium, which is delivered thereto from the conveyor unit, attracted and attached thereto and supported thereon, thereby conveying the recording medium to a subsequent step.

Abstract: An ink jet recording head has a plurality of pressure chambers each driven by a piezoelectric element for ejection of ink droplets having different diameters from a nozzle. The drive voltage for the piezoelectric element has a controlled rise-time, controlled pulse period, and a controlled fall-time for ejecting ink droplets having different diameters and a constant velocity.

Abstract: An ink jet recording head according to the present invention ejects an ink droplet from a nozzle by applying a drive voltage to an electro-mechanical transducer located at the position corresponding to a pressure generation chamber, and deforming the electro-mechanical transducer. In the voltage wave form of the drive voltage that the ink jet recording head applies to the electro-mechanical transducer during a recording time, the rise time up to the peak voltage, and the fall time down to the basic voltage are both equal to approximately a half of the natural period To of the acoustic oscillation of the ink in an ink-flow course system, whereas the time Tw from the beginning of rising to the beginning of falling is equal to integer-times the natural period To including one.

Abstract: A drop-on-demand ink-jet printing head has an ink chamber filled with ink from an ink supply reservoir. The ink chamber has a deflectable upper elastic surface, a deflection of which increases ink fluid pressure. A deflection of said surface exciting a plurality of resonant pressure vibration modes within the chamber. A pressure increase within the chamber causing an ink droplet to be projected out a nozzle at one end of the chamber. A piezoelectric transducer is fixed on the elastic surface to deflect it and excite resonant vibration with a plurality of nodes and loops or antinodes. The transducer is positioned on the elastic surface at one of the loops or antinodes of a preselected one of the pressure vibration modes to excite the pressure modes with a short time constant (high frequency) which enables a very fine droplet of small volume to be projected. This can be done without reducing the cross sectional area of the nozzle or the velocity of the droplet.

Abstract: A multi-nozzle ink drop-on-demand type of ink-jet printing head is able to deliver ink droplets at a higher rate of speed through a use of capillary action. Each of the many nozzles receives the ink required to form a droplet from an individually associated pressure chamber which is squeezed by its own (preferably piezoelectric) driving transducer. A capillary supply path by-passes each of the pressure chambers to provide an initial ink supply which is the start of a droplet formation that is completed upon the operation of the driving transducer. Thus, a time lag is eliminated, which would otherwise be required to start the droplet formation, and that lag elimination enables a faster ink jet response.