Abstract:
PROBLEM TO BE SOLVED: To prevent all kinds of debris such as coating material and paper dust from accumulating between a form plate material and a doctor blade by furnishing means for removing debris adhered to the surface of printing paper to be fed in a form cylinder. SOLUTION: The debris removing device 31 includes a first and second debris removing roller 32, 33 of debris removing means, and an adhesive layer 32a, 33a are formed for removing debris on the outer circumference of these debris removing rollers 32, 33 by the agency of adhesiveness. The first debris removing roller 32 disposed at the upper part is set having a slightly smaller interstice than the thickness of printing paper 22 close to the lower part of a form cylinder 3, and the second debris removing roller 33 disposed at the lower part is put in press contact with the lower part of the debris removing roller 32 from the downside thereof. A substantial lower half part of the second debris removing roller 33 is soaked in washing liquid 35 within the washing bath 34 of washing means, and a tip of the debris removing blade 36 therein is placed in contact with the outer circumference of the second debris removing roller 33.
Abstract:
PURPOSE:To reduce time required for an ON-state current to reach a predetermined value to reduce a power loss of a semiconductor laser when it is driven on ON/OFF signals by a method wherein during an OFF period in which recesses are not formed on a plate by the semiconductor laser, an electric current up to the vicinity of the threshold of exciting the semiconductor laser is passed to the semiconductor laser. CONSTITUTION:When a status signal 31 of an input operation part 30 is inputted to a CPU 32, the CPU 32 respectively supplies normal or reverse rotation pulses to motor drivers 33, 35 to control a laser block travel motor 24 and a plate cylinder rotating motor 7. Simultaneously, the CPU 32 supplies image data 41 to a laser driver 43 through a gray scale conversion circuit 42 to control a semiconductor laser 10. In this manner, the semiconductor laser 10 forms recesses 15 corresponding to data of the video input signals on a plate sheet 2 set on the peripheral surface of a plate cylinder 1. In this case, in the laser driver 43, an electric current to be passed during an OFF period of the semiconductor laser 10 is set up to the vicinity of the threshold thereof through a threshold setting circuit 44.
Abstract:
PURPOSE:To prevent the adhesion of scattering matters and the like to a focal lens and the like to stably make a plate by a method wherein air blows to the surface of a plate cylinder to be irradiated with a laser beam at the time of a plate making to blow off and remove the scattering matters and the like of a plate material generated when recesses are formed on the surface of the plate cylinder. CONSTITUTION:A laser block 21 emits a laser beam from a semiconductor laser 10 to the surface of a plate 2 wound on the peripheral surface of a plate cylinder 1 through a collimator lens 12 and a focal lens 13. As a result, a gravure plate consisting of predetermined recesses 15 is formed on the surface of the plate 2. In the construction mentioned above, cross roller fans 67 are juxtaposed below the plate cylinder 1 along a rotating shaft. 0With the rotation of the cross roller fans 67, a blast 72 is fed upward between the plate 2 and the focal lens 3 to generate an air flow 73. In this manner, scattering matters 68 and the like of a plate material generated at the forming of the recesses 15 are blown off upward, whereby the adhesion of the scattering matters 68 and the like on the surface of the focal lens 3 is prevented.
Abstract:
PROBLEM TO BE SOLVED: To prevent discharge fault caused by drying or viscosity increase of ink and to print a printing material without blur by humidifying a discharging part during printing. SOLUTION: In a printer apparatus 1, a humidifying liquid and ink cartridges of yellow, magenta, cyan, and black 10w, 10y, 10m, 10c, and 10k are sequentially juxtaposed in a head cartridge 3 from the upstream side to the downstream side in the conveyance direction of recording paper 2. A system controller 22 causes a nozzle array 15w of the humidifying liquid to discharge humidifying droplets w onto the recording paper 2. When the humidifying droplets w discharged onto the recording paper 2 evaporate from the recording paper 2, the nozzle arrays 15y, 15m, 15c, and 15k of the ink cartridges 10y, 10m, 10c, and 10k of the colors and the vicinities thereof can be humidified during printing. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent a defect which may occur when bubbles or dust entering a liquid chamber stays, for example, in an inkjet printer of a liquid droplet ejection head and a liquid droplet ejection device. SOLUTION: Cross sectional shapes of a wall face of a liquid chamber 34 and a wall face of a nozzle 36 are made to be a continuous straight shape. Alternatively, each of the wall face of the liquid chamber 34 and the wall face of the nozzle 36 is made to be a straight shape so that a width of each of the liquid chamber 34 and the nozzle 36 is reduced toward an orifice, and the width of the nozzle 36 is set to be greater at the nozzle 36 side more than that of the liquid chamber 34 at a joint between the liquid chamber and the nozzle. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that a yield is low and manufacturing costs become high because a high assembly accuracy is required for a large head comprised of a plurality of small heads. SOLUTION: A method is proposed in which arrangement ranges of ejecting parts formed in respective small heads are made to partly overlap with each other when the large head to be a drive object is comprised of the plurality of small heads with many ejecting parts, and in which a use range of the ejecting part and an ejection timing are set for each small head so that a positional gap of a joint of adjacent recording patterns among individual recording patterns formed by respective small heads which constitute a large head becomes minimum. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem wherein the number of gradation reproducible is remarkably decreased by a method for correcting largely the value of gradation by a gradation correcting part. SOLUTION: In an information storing part of a liquid delivering head expressing one pixel with a number of liquid droplets generated, selective information of a boundary value table for diffusing multi-value errors is stored for every delivering condition. When a liquid delivering head is mounted, the selective information matching the delivering condition is read, and the boundary value table corresponding to the selective information is set for referring of a half toning part. Thereby the boundary value table is optimized, and gradation characteristics are corrected without remarkably decreasing the number of gradation reproducible. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem wherein pseudo contour, sweeping, texture or other phenomena due to transient response of a feedback loop system appear on a printing screen. SOLUTION: The gradation conversion apparatus is proposed which converts an image intensity signal having gradation of an m-value (m being an integer) into an image intensity signal having gradation of an n-value (n being an integer smaller than m), and adds a propagation error E generated in the preceding gradation conversion to a next image intensity signal to correct gradation. The apparatus has: (a) a correction amount comparator for comparing a propagation error E to be used for the next gradation conversion with a reference conversion amount K; and (b) an error correction control unit for using the propagation error E for gradation correction of the image intensity signal to be used for the next gradation conversion, if the propagation error E is not less than the reference correction amount K, and for not using the propagation error E for gradation correction of the image intensity signal to be used for the next gradation conversion, but for adding the propagation error E to a conversion error CE to be generated in the next gradation conversion, if the correction value is smaller than the reference correction amount K. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid ejector and a liquid ejecting method capable of preventing degradation in image quality due to color gap. SOLUTION: When the carrying speed of a recording sheet P increases during print operation, a control section 128 controls ejection timing of inks other than black to be delayed before the carrying speed of the recording sheet P is accelerated based on ejection control data created at the control section 128 based on the temperature detected by a temperature sensor 74 and impact position data from an impact position detecting section 75. Color gap is prevented by impacting ink other than black at a position to be impacted with black ink. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid ejector and a liquid ejecting method capable of preventing degradation in image quality due to color gap. SOLUTION: When the carrying speed of a recording sheet P increases during print operation, a control section 129 controls ejection timing of inks other than black to be delayed before the carrying speed of the recording sheet P is accelerated based on ejection control data dependent on the temperature detected by a temperature sensor 74 and the type of the recording sheet P prestored in a memory section 128. Color gap is prevented by impacting ink other than black at a position to be impacted with black ink. COPYRIGHT: (C)2005,JPO&NCIPI