Abstract: An inkjet printing apparatus includes: a print bar unit including an inkjet head configured to eject ink to a web being conveyed; and a guide configured to guide movement of the print bar unit in a print bar movement direction intersecting a conveyance direction of the web between a first position, a second position, and a third position. The first position is a position where the print bar unit performs printing on the web. The second position and third position are located on one and the other sides of the first position in the print bar movement direction.

Abstract: A printing machine includes a printing unit which performs printing while transferring a sheet at a printing transfer speed, a circulation transfer unit which receives the sheet after simplex printing and transfers the sheet by reversing the sheet upside down, during duplex printing; and a paper refeed unit which refeeds, to the printing unit, the sheet transferred by the circulation transfer unit after simplex printing, wherein the circulation transfer unit includes a reversing unit which receives the sheet at the printing transfer speed, reverses the sheet upside down by switching back the sheet and accelerates the sheet up to a circulation transfer speed which is higher than the printing transfer speed when sheet transfer is restarted after temporal stop in the switching back, and a horizontal transfer unit which transfers the sheet switched back by the reversing unit, at the circulation transfer speed.

Abstract: An inkjet printing apparatus includes: a print bar unit including an inkjet head configured to eject ink to a web being conveyed; and a guide configured to guide movement of the print bar unit in a print bar movement direction intersecting a conveyance direction of the web between a first position, a second position, and a third position. The first position is a position where the print bar unit performs printing on the web. The second position and third position are located on one and the other sides of the first position in the print bar movement direction.

Abstract: A printing machine includes a printing unit which performs printing while transferring a sheet at a printing transfer speed, a circulation transfer unit which receives the sheet after simplex printing and transfers the sheet by reversing the sheet upside down, during duplex printing; and a paper refeed unit which refeeds, to the printing unit, the sheet transferred by the circulation transfer unit after simplex printing, wherein the circulation transfer unit includes a reversing unit which receives the sheet at the printing transfer speed, reverses the sheet upside down by switching back the sheet and accelerates the sheet up to a circulation transfer speed which is higher than the printing transfer speed when sheet transfer is restarted after temporal stop in the switching back, and a horizontal transfer unit which transfers the sheet switched back by the reversing unit, at the circulation transfer speed.

Abstract: A sheet ejection device includes a sheet tray on which ejected sheets are stacked, a pair of side fences for restricting positions of the ejected sheets along a lateral direction perpendicular to an ejection direction, and at least one rib is formed vertically on each inner side of the side fences. The ribs are configured to contact with side edges of each of the ejected sheets while the each of the ejected sheets falls down to the sheet tray to align the ejected sheet along the lateral direction. The ejected sheets are aligned adequately by the ribs. According to the sheet ejection device, superior sheet ejection performance can be brought without affected by its environment.

Abstract: An image forming apparatus includes a conveying device for conveying paper, an image forming unit for forming an image on the paper, and a paper discharge tray where the image-formed paper is discharged and loaded at a predetermined discharge angle by the conveying device. The conveying device is controlled in a manner that a discharge speed of a first sheet of the paper is different from a discharge speed of second and subsequent sheets of the paper.

Abstract: An image forming machine includes an image data memory, an image data mapper, and a printer. For an envelope, the image data memory stores image data to be printed on a back of the body and a face of the flap, as backside image data. Based on this data, the image data mapper generates print data including a first print data to be printed on the body back and a second print data to be printed on the flap face. The printer prints a part of the backside image data on the body back in accordance with the first print data, and a remaining part of the backside image data on the flap face in accordance with the second print data.

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 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: A sheet ejection device includes a sheet tray on which ejected sheets are stacked, a pair of side fences for restricting positions of the ejected sheets along a lateral direction perpendicular to an ejection direction, and at least one rib is formed vertically on each inner side of the side fences. The ribs are configured to contact with side edges of each of the ejected sheets while the each of the ejected sheets falls down to the sheet tray to align the ejected sheet along the lateral direction. The ejected sheets are aligned adequately by the ribs. According to the sheet ejection device, superior sheet ejection performance can be brought without affected by its environment.

Abstract: An inkjet image forming apparatus includes print heads, a first tank, an ink circulation line, and a controller. The ink circulation line includes an ink supply line for supplying ink from the first tank to the print heads, and an ink return line for returning ink collected from the print heads to a second tank. The controller controls line elements of the ink circulation line, to adjust a magnitude relation between a first product and a second product, in accordance with the type of ink. The first product is a product of factors including a flow passage length along, a viscosity of ink in, and a fluid resistance coefficient of the ink supply line. The second product is a product of factors including a flow passage length along, a viscosity of ink in, and a fluid resistance coefficient of the ink return line.

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 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.

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: An image forming apparatus includes a conveying device for paper; an image forming device for forming an image on the paper; and a paper discharge tray where the image-formed paper is discharged and loaded at a predetermined discharge angle by the conveying device. A speed of the paper discharge by the conveying device is controlled in accordance with at least one of the discharge angle and a type of paper to be used.

Abstract: An image forming machine includes an image data memory, an image data mapper, and a printer. For an envelope, the image data memory stores image data to be printed on a back of the body and a face of the flap, as backside image data. Based on this data, the image data mapper generates print data including a first print data to be printed on the body back and a second print data to be printed on the flap face. The printer prints a part of the backside image data on the body back in accordance with the first print data, and a remaining part of the backside image data on the flap face in accordance with the second print data.

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: An inkjet printing system using a non-aqueous ink composition, wherein the head holder is configured to define an upper spatial region and a lower spatial region relative to the head holder, and is provided with a plurality of air communication holes for air communication between the upper spatial region and the lower spatial region, and the non-aqueous ink composition comprises a pigment, a pigment dispersant in such an amount that a mass ratio in solid content of the pigment dispersant to the pigment ranges from 0.2 to 2.0, and an organic solvent, the pigment dispersant comprising (A) a polyamide having a polyester side chain and/or a copolymer of vinylpyrrolidone and a C10-40 alkene, and (B) an alkyl (alkyl)acrylate copolymer dispersed in the non-aqueous ink composition.

Abstract: An inkjet image forming apparatus includes print heads, a first tank, an ink circulation line, and a controller. The ink circulation line includes an ink supply line for supplying ink from the first tank to the print heads, and an ink return line for returning ink collected from the print heads to a second tank. The controller controls line elements of the ink circulation line, to adjust a magnitude relation between a first product and a second product, in accordance with the type of ink. The first product is a product of factors including a flow passage length along, a viscosity of ink in, and a fluid resistance coefficient of the ink supply line. The second product is a product of factors including a flow passage length along, a viscosity of ink in, and a fluid resistance coefficient of the ink return line.