Abstract: An inkjet printer 10 includes a platen plate 4 that has recess portions 41 and suction holes 42, and an inkjet type print head that has arrays of ink discharge nozzles right above the recess portions 41. Each suction hole 42 is set to have a first flow rate of air in a first suction path, and a second flow rate of air in a second suction path. The first suction path is made by the suction hole 42, and one of regions extending at a recess portion 41 of the platen plate 4, with the suction hole 42 intervening in between in a transfer direction. The arrays of ink discharge nozzles are disposed in the one region. The second suction path is made by the suction hole 42 and the other region at the recess portion 41. The second flow rate is smaller than the first flow rate.

Abstract: An inkjet printing apparatus includes: a conveyer belt with a plurality of belt holes formed therein, the conveyer belt suctioning and conveying a recording medium with a negative pressure acting on the belt holes; a platen with a plurality of through holes formed therein; a pressure-reducing unit for generating the negative pressure on a side of the platen opposite from the side thereof supporting the conveyer belt; inkjet nozzles disposed to face the platen; a distance-changing unit for changing a distance between the inkjet nozzles and a surface of the conveyer belt on which the recording medium is suctioned; and a size-adjusting unit for adjusting, when the distance is large, a size of at least one through hole in a through hole group, which includes the through holes positioned in the vicinity of the inkjet nozzles, such that the size of the at least one through hole is reduced.

Abstract: An inkjet printing apparatus includes: an inkjet head; a head holder for holding the inkjet head; a platen positioned below the head holder to face the head holder, the platen including a plurality of through holes formed therein; suction means for generating a suction force at the through holes; and a porous platen belt traveling over the platen for suctioning and conveying a paper sheet. The head holder separates between an upper space above the head holder and a lower space below the head holder, and includes a plurality of air holes, which allow communication of air between the upper space and the lower space, within a projection range of the platen onto the head holder. The total opening area of the air holes is 20 percent or more of the total projection area of the inkjet head onto the head holder.

Abstract: An image forming apparatus including: a print-job controller configured to receive a print job and control a printing operation based on the received print job; an ink-ejection driver configured to output a driving signal on the basis of the print job; an ink ejector configured to eject ink onto a paper sheet on the basis of the driving signal outputted by the ink-ejection driver; and an ink-temperature measuring unit configured to measure an ink temperature. When the ink temperature measured by the ink-temperature measuring unit is equal to or higher than a first reference temperature, the ink-ejection driver outputs a driving signal of a first voltage.

Abstract: An ink-jet printer comprises: a platen plate including a plurality of recesses, which are formed and regularly arranged in a front surface by digging from the front surface toward the back surface, and a suction hole extending from a part of the bottom surface of the recess through the back surface; and a print head having ink-discharging nozzles arranged in a nozzle face which is arranged in a position facing the front surface of the platen plate. The ink-discharging nozzles are arranged between an opening end of the recess and an opening end of the suction hole excluding an area directly above the suction hole of the platen plate.

Abstract: Streams of ink being returned by a circulation pump from a lower tank through an upstream flow path block to an upper tank have viscosities higher than viscosities of streams of ink being supplied from the upper tank through a downstream flow path block to an inkjet head, there being a difference in flow rate of ink developed with attendant differences in viscosity between the upstream flow path block and the downstream flow path block, while being reduced by differences between heating efficiencies in the upstream flow path block and heating efficiencies in the downstream flow path block.

Abstract: An inkjet printer includes a printing unit, a transfer route, a heating chamber, and a heater. The printing unit ejects ink onto a sheet through nozzles of the inkjet heads. The transfer route transfers the sheet as printed at the printing unit. The heating chamber accommodates at least part of the transfer route to heat the sheet as transferred in the transfer route. The heater heats inside the heating chamber. The heating chamber is sectioned into sub-chambers along the transfer route, including a first sub-chamber to be heated by the heater and a second sub-chamber to be lower in temperature than the first sub-chamber and located between the printing unit and the first sub-chamber.

Abstract: A sheet transfer system includes a register roller working for transfer of a one-side printed print sheet and a non-printed print sheet, a pair of first guide plates working to guide the one-side printed print sheet to the register, and a pair of second guide plates working to guide the non-printed print sheet to the register. The first guide plates make an opening angle ?1 in between greater than an opening ?2(?3) the second guide plates make in between.

Abstract: A sheet transfer mechanism for a printer 100 to form an image on a sheet 10 being transferred in a transfer route by propelling ink at ink heads 110a, includes: a transfer belt 160 that has a plurality of adhesion through-holes 165 for holding a sheet 10 and transfers the sheet 10 being held thereon; a platen 620 that slidably supports the transfer belt 160 in an area facing the ink heads 110a and has a plurality of suction through-holes 622 in an area through which the plurality of the adhesion through-holes 165 pass; a suction fan 650 that generates airflow with negative pressure for holding the sheet 10 on the transfer belt 160 through the plurality of the suction through-holes 622 and the plurality of the adhesion through-holes 165; and plugging plates 624 that adjust a number density of the suction through-holes 622 in the platen 620 depending on an arrangement of the ink heads 110a.

Abstract: An image forming apparatus including: a print-job controller configured to receive a print job and control a printing operation based on the received print job; an ink-ejection driver configured to output a driving signal on the basis of the print job; an ink ejector configured to eject ink onto a paper sheet on the basis of the driving signal outputted by the ink-ejection driver; and an ink-temperature measuring unit configured to measure an ink temperature. When the ink temperature measured by the ink-temperature measuring unit is equal to or higher than a first reference temperature, the ink-ejection driver outputs a driving signal of a first voltage.

Abstract: An image forming apparatus for a printer forms images by injecting inks on a printing paper being fed on a feeding path. The image forming apparatus comprises a head holder surface provided on the feeding path with being opposed to a surface of the feeding path and a plurality of ink heads for injecting inks from injection ports thereof. Here, the injection ports of the plurality of ink heads are projected outward from the head holder surface. The image forming apparatus can achieve further downsizing and multifunctional capability and improve quality of higher pixelated printed images. In addition, the image forming apparatus can prevent negative effects such as ink injection failures or defacement of printed matters due to ink mists made on injecting ink.