JP5698627B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an ink jet recording apparatus, and more particularly to a technique for attracting and transporting paper.

  2. Related Art Inkjet printing systems that perform recording on paper by ejecting ink from nozzles of a recording head are known. In the inkjet printing system, if the paper floats when passing through the vicinity of the inkjet head, the image hitting height will be different and the image quality will deteriorate, or the paper will rub against the head surface and the head surface will be damaged. To do. Therefore, it is necessary to hold the sheet while keeping the sheet floating height small.

  In order to solve such a problem, a technique for preventing the sheet from floating by adsorbing the sheet to the sheet holding surface by the negative pressure of air is known. For example, Patent Document 1 discloses a configuration in which an adsorption sheet is provided around an adsorption conveyance drum as a method for adsorbing paper in an inkjet recording apparatus. According to this technique, it is possible to suck and hold a sheet with an appropriate suction pressure.

JP 2009-208920 A

  Water-based inks (colors such as dyes and pigments in water and water-soluble solvents) on general-purpose printing paper (paper based on cellulose such as coated paper used for general offset printing, not so-called inkjet paper) When an image is recorded by an ink jet method using an ink in which a material is dissolved or dispersed, curling or cockling occurs. This phenomenon occurs because the water in the ink breaks the hydrogen bonds between the fibers of the paper, causing the paper to swell.

  As described above, the paper recorded by the ink jet recording apparatus has a tendency that a portion having a large amount of droplet ejection generally extends when a portion having a high ink ejection rate and a region having a low ink ejection rate are generated. Thereby, when performing back surface printing, the planarity of the paper may be impaired.

  On the other hand, the technique disclosed in Patent Document 1 has a problem in that the sheet having such elongation cannot be adsorbed neatly on the flat adsorbing sheet surface when the back surface is passed. Further, if the sheet is pressed against a flat surface and adsorbed, the distortion of the sheet finally gathers and the sheet is stretched, causing a problem that the sheet is lifted or wrinkled.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an ink jet recording apparatus that holds a deformed sheet without causing floating or wrinkles.

Means for solving the problems are as follows. One aspect of the ink jet recording apparatus includes a paper holding member having a suction surface provided with a plurality of suction holes, an elastic member that is disposed on the suction surface and allows air to pass in the thickness direction, and the plurality of suction holes. A suction unit that communicates and sucks and holds a sheet on the elastic member by sucking the suction hole under a negative pressure; an ink-jet head that records an image by discharging ink onto the sucked and held sheet; and the ink-jet head And a moving means for relatively moving the paper holding member, the elastic member has a porous structure, and an air blocking member for blocking air flow is provided on an end surface of the elastic member, and the suction of the suction means When the pressure acts on the paper on the elastic member, the elastic member compressively deforms in the thickness direction, and the paper sinks into the elastic member.

  The first aspect is a sheet holding member having a suction surface provided with a plurality of suction holes, an elastic member that is arranged on the suction surface and allows air to pass in the thickness direction, and communicates with the plurality of suction holes. A suction means for sucking and holding a sheet on the elastic member by sucking the suction hole under a negative pressure, an ink jet head for recording an image by discharging ink onto the sucked and held sheet, the ink jet head and the sheet An ink jet recording apparatus comprising: a moving unit that relatively moves the holding member.

  According to this aspect, since the deformed paper can be held without causing floating or wrinkles, the paper and the inkjet head can be transported without contacting each other, and ink can be appropriately ejected onto the paper. Can do.

  According to a second aspect, in the ink jet recording apparatus according to the first aspect, a paper pressing roller is provided that contacts the surface of the paper on the elastic member and adjusts the height in the thickness direction of the paper.

  As a result, the appropriately deformed paper can be sucked and held.

  According to a third aspect, in the ink jet recording apparatus according to the second aspect, an adjustment mechanism for adjusting a distance between the paper pressing roller and the elastic member according to a thickness of the paper.

  Thereby, the height in the thickness direction of the paper can be adjusted appropriately.

  According to a fourth aspect, in the ink jet recording apparatus according to the first to third aspects, the elastic member has a porous structure, and an airflow blocking member that blocks airflow is provided on an end surface of the elastic member.

  As a result, the sheet can be appropriately held by suction on the elastic member.

  According to a fifth aspect, in the ink jet recording apparatus according to the first to fourth aspects, the elastic member has a substantially V-shaped cross section in the thickness direction at the end face.

  Thereby, resistance to compressive deformation in the thickness direction can be reduced.

  According to a sixth aspect, in the ink jet recording apparatus according to the first to fifth aspects, the sheet holding member is a carriage in which a sheet-like member provided with a plurality of suction holes is disposed on an upper surface.

  Accordingly, it is possible to appropriately transport the paper and eject ink.

  A seventh aspect is the ink jet recording apparatus according to any one of the first to fifth aspects, wherein the paper holding member is an endless belt having an outer peripheral upper surface as an adsorption surface, and the moving means includes the endless belt. A pair of rollers for guiding and driving means for rotating the rollers were provided.

  Accordingly, it is possible to appropriately transport the paper and eject ink.

  An eighth aspect is the ink jet recording apparatus according to any one of the first to fifth aspects, wherein the sheet holding member is a cylindrical drum in which a sheet-like member provided with a plurality of suction holes is arranged on the outer peripheral surface. The moving means includes a driving means for rotating the drum.

  Accordingly, it is possible to appropriately transport the paper and eject ink.

  According to the present invention, since the deformed paper can be held without causing floating or wrinkles, the paper and the inkjet head can be transported without contacting each other, and ink can be appropriately ejected onto the paper. Can do.

1 is a side view of a sheet holding device according to a first embodiment. Top view of suction sheet Top view of elastic body Cross section of the end of the elastic body 1 is an overall configuration diagram of an ink jet recording apparatus according to a first embodiment. Diagram showing paper Diagram showing paper Overall configuration diagram of an ink jet recording apparatus according to a second embodiment Sectional view of the belt viewed from the paper transport direction Diagram showing paper Overall configuration diagram of an ink jet recording apparatus according to a third embodiment Diagram showing paper

[First Embodiment]
FIG. 1 is a side view of a sheet holding device 100 according to the present embodiment. As shown in the figure, the sheet holding device 100 includes a carriage 110, a suction sheet 114, an elastic body 116, and the like.

  The carriage 110 has a flat upper surface that is larger than the paper to be held.

  The suction sheet 114 is a sheet made of stainless steel and having a uniform thickness (vertical direction in FIG. 1), and is disposed on the upper surface of the carriage 110. The upper surface of the suction sheet 114 serves as a paper hold reference surface. FIG. 2 is a plan view of the suction sheet 114. As shown in the figure, a large number of suction holes 115 pass through the suction sheet 114.

  A suction unit 112 that performs negative pressure suction is provided inside the carriage 110, and the suction unit 112 communicates with each suction hole 115 of the suction sheet 114.

  The elastic body 116 is a sheet-like member having a uniform thickness (vertical direction in FIG. 1), and is disposed on the upper surface of the suction sheet 114. FIG. 3 is a plan view of the elastic body 116. As the elastic body 116, a soft material having air permeability in the thickness direction is used. For example, a sponge having a porous structure (open cell structure) can be used. The thickness of the elastic body 116 is preferably 0.5 mm or less. In the present embodiment, it is assumed that an elastic body 116 made of sponge and having a thickness of 0.2 mm is attached to the suction sheet 114. The elastic body 116 may be a member coated on the upper surface of the suction sheet 114.

  FIG. 4 is a cross-sectional view of the end portion of the elastic body 116. As shown in FIG. 4A, the end surface of the elastic body 116 has a substantially V-shaped cross section in the thickness direction toward the inside of the elastic body 116 in order to reduce resistance to compressive deformation in the thickness direction. ing. In addition, as shown in FIG.4 (b), the substantially V shape may be formed toward the outer side of the elastic body 116. FIG.

  Further, the elastic body 116 is provided with a coating film 117 on the end face thereof as a ventilation blocking member that blocks ventilation.

  According to the sheet holding device 100 configured as described above, when the suction unit 112 sucks negative pressure while the sheet is placed on the upper surface of the elastic body 116, the suction pressure is passed through the suction hole 115 and the elastic body 116. Acting on the paper, the paper is sucked and held on the elastic body 116. The coating film 117 loses the air permeability of the end face of the elastic body 116 and prevents suction leakage from the end. Therefore, it is possible to appropriately hold and hold the paper also at the end of the elastic body 116.

  FIG. 5A is an overall configuration diagram of an inkjet recording apparatus to which the above-described sheet holding device 100 is applied. The ink jet recording apparatus 130 records an image by an ink jet method using a water-based ink (an ink in which a coloring material such as a dye or a pigment is dissolved in water and a solvent soluble in water) on paper (sheet paper). This is a sheet-fed water-based inkjet printer.

  As shown in FIG. 5A, the ink jet recording apparatus 130 includes a paper holding device 100, a paper pressing roller 132, and an ink jet head 134.

  The sheet holding device 100 is configured to be horizontally movable from right to left in FIG. 5 by a drive mechanism (not shown).

  The sheet pressing roller 132 is a cylindrical roller having a width wider than the entire width of the sheet 120 held by the sheet holding apparatus 100, and rotates in contact with the upper surface of the sheet 120 passing under the sheet pressing roller 132. To do.

  The inkjet head 134 is a line head having a nozzle row having a length corresponding to the entire width of the paper 120. The inkjet head 134 can record an image by ejecting ink onto the upper surface of the paper 120 that passes through a position facing the nozzle row. Note that the inkjet head 134 may be a so-called shuttle type head configured to eject ink over the entire width of the paper 120 by scanning in the near / depth direction of FIG. 5.

  The paper 120 is not particularly limited, but general-purpose printing paper used in general offset printing (so-called high-quality paper, coated paper, art paper, and other paper mainly composed of cellulose) can be used. In this example, coated paper is used. The coated paper is one in which a coating layer is provided by coating a coating material on the surface of high-quality paper or neutral paper that is generally not surface-treated. Specifically, art paper, coated paper, lightweight coated paper, finely coated paper and the like are preferably used.

  As shown in FIG. 5A, first, the paper 120 is placed on the paper holding device 100. Here, it is assumed that the front side of the paper 120 has already been printed, and that the back side will be printed. Thereafter, as illustrated in FIG. 5B, the sheet holding device 100 conveys the sheet 120 in the left direction in FIG. 5 by a drive mechanism (not illustrated).

  The surface of the sheet pressing roller 132 and the surface of the elastic body 116 are formed on a low friction surface. Further, the sheet pressing roller 132 is configured to be able to adjust the distance from the sheet holding device 100 (elastic body 116) according to the thickness of the sheet 120 by an adjustment mechanism (not shown). The adjustment of the distance may be performed by automatically detecting the thickness of the paper 120 or may be manually adjusted by the user according to the type of paper. In the present embodiment, the distance between the surface of the elastic body 116 of the sheet holding device 100 and the sheet contact surface of the sheet pressing roller 132 is set to be equal to the thickness of the sheet 120.

  Accordingly, the sheet pressing roller 132 rotates so that the floating portion of the sheet 120 follows the elastic body 116 without pressing the sheet 120 against the elastic body 116. Here, the surface of the sheet pressing roller 132 and the surface of the elastic body 116 are formed with low friction so that the sheet 120 can be brought into close contact with the surface of the elastic body 116 appropriately. The height can be adjusted appropriately.

  As shown in FIG. 5C, when the entire sheet 120 passes through the sheet pressing roller 132, the suction unit 112 starts negative pressure suction. As a result, the sheet is sucked and held on the elastic body 116.

  Further, as shown in FIG. 5D, when the paper 120 reaches just below the inkjet head 134, ink is ejected from the inkjet head 134 and printing is performed.

  FIG. 6 is a diagram schematically showing the sheet 120 held by suction in this way. The sheet 120 is deformed due to surface printing or the like, but the deformed portion is submerged in the elastic body 116. In the present embodiment, the suction force of the suction portion 112 is determined so that the deformed portion sinks by about 0.1 mm. The suction force of the suction unit 112 is preferably configured to be adjustable according to the hardness, thickness, and the like of the paper 120.

  Thus, according to the ink jet recording apparatus 130, the deformed portion can be naturally adsorbed and held without being forced to be flattened. Further, since the paper deformation is not forcibly corrected, large floating and wrinkles can be suppressed in a form in which the deformation of the paper deformation is dispersed.

  FIG. 7 is a schematic diagram showing a case where the sheet 120 is raised upward. If the sheet 120 is directly adsorbed to the non-elastic adsorbing sheet 114, the sheet 120 is lifted in the range B in FIG.

  However, when the elastic body 116 is formed on the upper surface of the suction sheet 114, the paper 120 is entirely submerged with respect to the elastic body 116. Therefore, the floating of the paper 120 occurs in the range of A in FIG. To do. In this way, since the paper has already sinked into the elastic member in the sucked state, the suction force can be transmitted to the dispersed convex portions over a larger area than the inner surface, so that the paper floating level can be suppressed. it can.

  Therefore, when passing under the ink jet head, it does not come into contact with the ink jet head and is appropriately adsorbed and held, so that it is possible to appropriately eject ink and record an image.

[Second Embodiment]
Next, a case where the paper is conveyed by a belt will be described.

  FIG. 8 is an overall configuration diagram of the ink jet recording apparatus according to the present embodiment. As shown in the drawing, the inkjet recording apparatus 200 includes a plurality of heads 210K, 210C, 210M, which are provided corresponding to black (K), cyan (C), magenta (M), and yellow (Y) inks. The inkjet head 210 having 210Y, the belt conveyance unit 230 that is disposed to face the nozzle surface (ink ejection surface) of the inkjet head 210, conveys the sheet 220 while maintaining the planarity of the sheet 220, and the inkjet head 210. A print detection unit 240 that reads the print result is provided.

  The belt conveyance unit 230 has a structure in which an endless belt 236 is wound between rollers 232 and 234, and at least a portion facing the nozzle surface of the inkjet head 210 and the sensor surface of the print detection unit 240 is a horizontal surface (flat). Surface).

  FIG. 9 is a cross-sectional view of the belt 236 as viewed from the paper conveyance direction. As shown in the figure, the belt 236 includes a belt body 237 and an elastic body 238.

  The belt 236 has a width (horizontal direction in FIG. 9) wider than the width of the paper 220. The belt main body 237 is formed of rubber or urethane, and a number of suction holes (not shown) pass through the surface thereof. The outer peripheral surface of the belt body 237 serves as a paper hold reference surface.

  An elastic body 238 is disposed on the outer peripheral surface of the belt main body 237. The elastic body 238 is a sheet-like member having a uniform thickness, and has air permeability in the thickness direction (vertical direction in FIG. 9). As the material, for example, a sponge having a porous structure can be used as in the elastic body 116 of the first embodiment. Further, both end surfaces of the elastic body 238 are formed in a substantially V-shaped cross section in order to reduce resistance to compressive deformation in the thickness direction, and a coating film 239 is formed to prevent suction leakage. Yes.

  In addition, you may provide the suction sheet which many suction holes penetrated between the belt main body 237 and the elastic body 238.

  As shown in FIG. 8, an adsorption chamber 250 is provided at a position facing the nozzle surface of the inkjet head 210 and the sensor surface of the print detection unit 240 inside the belt 236 spanned between the rollers 232 and 234. . By sucking the suction chamber 250 with a fan 252 to a negative pressure, the sheet 220 placed on the belt 236 is sucked and held.

  The power of a motor (not shown) is transmitted to at least one of the rollers 232 and 234 around which the belt 236 is wound, whereby the belt 236 is driven in the counterclockwise direction in FIG. It is conveyed from right to left in FIG.

  A sheet 220 is fed from the sheet feeding unit 202 to the inkjet recording apparatus 200. Here, it is assumed that the front side of the paper 220 has already been printed, and that the back side will be printed. A sheet pressing roller 260 corresponding to the width of the sheet 220 is disposed in the sheet feeding unit 202 so as to face the roller 232, and the sheet 220 passes between the sheet pressing roller 260 and the roller 232 and passes over the belt 236. Installed.

  The surface of the sheet pressing roller 260 and the surface of the elastic body 238 are formed on a low friction surface. Further, the sheet pressing roller 260 is configured to be able to adjust the distance from the belt 236 (elastic body 238) according to the thickness of the sheet 220. In the present embodiment, the distance between the surface of the roller 232 and the elastic body 238 is set to be equal to the thickness of the paper 220.

  Therefore, the sheet pressing roller 260 rotates so that the floating portion of the sheet 220 follows the roller 232 without pressing the sheet 220 against the roller 232. Here, the surface of the sheet pressing roller 260 and the surface of the elastic body 238 are formed with low friction so that the sheet 220 can be brought into close contact with the surface of the elastic body 238 appropriately. The height can be adjusted appropriately.

  A heating fan 270 is provided on the upstream side of the inkjet head 210 on the paper conveyance path formed by the belt conveyance unit 230. The heating fan 270 heats the paper 220 by blowing heated air onto the paper 220 before printing. Heating the sheet 220 immediately before printing makes it easier for the ink to dry after landing.

  Each of the heads 210K, 210C, 210M, and 210Y has a length corresponding to the maximum paper width of the paper 220 targeted by the inkjet recording apparatus 200, and the nozzle surface has a length that exceeds at least one side of the maximum size recording medium. This is a full line type head in which a plurality of nozzles for ink ejection are arranged over the entire width (the full width of the drawable range).

  The heads 210K, 210C, 210M, and 210Y are arranged in the order of black (K), cyan (C), magenta (M), and yellow (Y) from the upstream side in the feeding direction of the sheet 220, and each head 210K. , 210C, 210M, 210Y are fixedly installed so as to extend along a direction substantially orthogonal to the conveyance direction of the sheet 220.

  When the sheet 220 is conveyed to a position facing the inkjet head 210 by the belt conveyance unit 230, the sheet 220 is sucked downward in FIG. 8 by the adsorption chamber 250 and is adsorbed and held on the elastic body 238.

  FIG. 10 is a diagram schematically showing the sheet 220 that is sucked and held in this way. The sheet 220 is deformed due to surface printing or the like, but the deformed portion is submerged in the elastic body 238. As described above, even when the sheet is conveyed by the belt, the sheet can be naturally adsorbed and conveyed without forcibly correcting the deformed portion. Further, since the paper deformation is not forcibly corrected, large floating and wrinkles can be suppressed in a form in which the deformation of the paper deformation is dispersed.

  A color image can be formed on the paper 220 by ejecting different colors of ink from the heads 210K, 210C, 210M, and 210Y while the paper 220 is being conveyed by the belt conveyance unit 230.

  In this way, when passing under the ink jet head, it does not come into contact with the ink jet head, and is appropriately adsorbed and held, so that it is possible to appropriately eject ink and record an image. .

  In this example, the configuration of KCMY standard colors (four colors) is illustrated, but the combination of ink colors and the number of colors is not limited to this embodiment, and light ink, dark ink, and special color ink are used as necessary. May be added. For example, it is possible to add an ink jet head that discharges light ink such as light cyan and light magenta. Also, the arrangement order of the color heads is not particularly limited.

  The print detection unit 240 shown in FIG. 8 includes an image sensor (line sensor or area sensor) for imaging the droplet ejection result of the inkjet head 210, and clogging of nozzles from the droplet ejection image read by the image sensor. It functions as a means for checking ejection characteristics such as landing position errors. Test charts or practical images printed by the color heads 210K, 210C, 210M, and 210Y are read by the print detection unit 240, and ejection determination of the color heads 210K, 210C, 210M, and 210Y is performed. The ejection determination includes the presence / absence of ejection, measurement of dot size, measurement of dot landing position, and the like.

  A post-drying unit 280 is provided following the print detection unit 240. The post-drying unit 280 is means for drying the printed image surface, and for example, a heating fan is used. Since it is preferable to avoid contact with the printing surface until the ink after printing is dried, a method of blowing hot air is preferred.

  When printing on porous paper with dye-based ink, the weather resistance of the image is improved by preventing contact with ozone or other things that cause dye molecules to break by pressurizing the paper holes with pressure. There is an effect to.

  A heating / pressurizing unit 290 is provided following the post-drying unit 280. The heating / pressurizing unit 290 is a means for controlling the glossiness of the image surface, presses with a pressure roller 292 having a predetermined surface uneven shape while heating the image surface, and transfers the uneven shape to the image surface. To do.

  The printed matter generated in this manner is outputted from the paper output unit 204.

[Third Embodiment]
Next, a case where the sheet is conveyed by drum will be described.

  FIG. 11 is an overall configuration diagram of the ink jet recording apparatus according to the present embodiment. As shown in the figure, an inkjet recording apparatus 300 includes an inkjet head 310 having a plurality of heads 310K, 310C, 310M, and 310Y provided corresponding to each color ink, and a nozzle surface (ink ejection surface) of the inkjet head 310. A cylindrical conveying drum 330 that is disposed to face and convey and hold the paper 320, and a paper pressing roller 340 for appropriately adsorbing the paper 320 to the conveying drum 330 are provided.

  The conveyance drum 330 holds the sheet 320 on the outer peripheral surface, and conveys the sheet 320 by rotating counterclockwise in FIG. 11 by a motor (not shown). A gripper may be provided on the outer peripheral surface of the conveyance drum 330 so as to hold the leading end portion of the paper 320 therebetween.

  An adsorption sheet 332 (see FIG. 12) is wound around the outer peripheral surface of the drum body of the conveyance drum 330. The suction sheet 332 is a sheet made of stainless steel and having a uniform thickness, and a large number of suction holes (not shown) pass therethrough. The outer peripheral surface of the suction sheet 332 becomes a paper hold reference surface. In addition, about the conveyance drum 330 and the suction sheet 332, the aspect of patent document 1 can be used preferably.

  An elastic body 334 (see FIG. 12) is wound around the outer peripheral surface of the suction sheet 332. The elastic body 334 is formed to have a uniform thickness with a soft material that is air permeable in the thickness direction. For example, a porous sponge can be used as before. The shape of the end face of the elastic body 334 and the formation of a coating film as a ventilation blocking member are the same as in the first and second embodiments.

  The sheet pressing roller 340 is a guide member for appropriately adsorbing and holding the sheet 320 on the outer peripheral surface of the transport drum 330, is opposed to the outer peripheral surface of the transport drum 330, and is upstream of the inkjet head 310 in the transport direction of the sheet 320. Placed in.

  A sheet 320 is supplied from the sheet feeding unit 302 to the inkjet recording apparatus 300. Here, it is assumed that the front side of the paper 320 has already been printed, and that the back side will be printed.

  The paper 320 supplied from the paper supply unit 302 passes between the transport drum 330 and the paper pressing roller 340 as the transport drum 330 rotates counterclockwise.

  The surface of the sheet pressing roller 340 and the surface of the elastic body 334 are formed on a low friction surface. Further, the sheet pressing roller 340 is configured to be able to adjust the distance from the transport drum 330 (elastic body 334) according to the thickness of the sheet 320. In the present embodiment, the distance between the surface of the elastic body 334 on the transport drum 330 and the sheet contact surface of the sheet pressing roller 340 is set to be equal to the thickness of the sheet 320.

  Accordingly, the sheet pressing roller 340 rotates so that the floating portion of the sheet 320 follows the elastic body 334 without pressing the sheet 320 against the elastic body 334. Here, the surface of the sheet pressing roller 340 and the surface of the elastic body 334 are formed with low friction so that the sheet 320 can be properly adhered to the surface of the elastic body 334. The height can be adjusted appropriately.

  Further, as shown in FIG. 11, a suction part 350 that performs negative pressure suction is provided from the position passing through the sheet pressing roller 340 to the position facing the nozzle surface of the inkjet head 310 inside the transport drum 330. . The suction part 350 communicates with each suction hole of the suction sheet 332 at the position.

  The paper 320 whose height in the thickness direction is adjusted by the paper pressing roller 340 is further transported by the transport drum 330 and is sucked and held on the elastic body 334 by the suction unit 350.

  FIG. 12 is a diagram schematically showing the paper 320 at this time. The sheet 320 is deformed due to surface printing or the like, but the deformed portion is submerged in the elastic body 334. As described above, even when the sheet is conveyed by the belt, the sheet can be naturally adsorbed and conveyed without forcibly correcting the deformed portion. Further, since the paper deformation is not forcibly corrected, large floating and wrinkles can be suppressed in a form in which the deformation of the paper deformation is dispersed.

  The heads 310K, 310C, 310M, and 310Y are arranged in the order of black (K), cyan (C), magenta (M), and yellow (Y) from the upstream side in the feeding direction of the paper 320, and each head 310K. , 310C, 310M, 310Y are fixedly installed so as to extend along a direction substantially orthogonal to the conveyance direction of the sheet 320.

  When the paper 320 is further transported by the transport drum 330 and the paper 320 reaches just below the ink jet head 310, ink is ejected from the ink jet head 310 and printing is performed.

  In this way, when passing under the ink jet head, it does not come into contact with the ink jet head, and is appropriately adsorbed and held, so that it is possible to appropriately eject ink and record an image. .

  The printed matter generated in this manner is outputted from the paper output unit 304.

  As described above, according to these embodiments, it is possible to hold the deformed paper sheet without causing floating or wrinkles, so that it is possible to appropriately eject ink onto the paper sheet.

  DESCRIPTION OF SYMBOLS 100 ... Paper holding device, 110 ... Carriage, 112, 350 ... Suction part, 114, 332 ... Adsorption sheet, 115 ... Adsorption hole, 116, 238, 334 ... Elastic body, 117, 239 ... Coating film, 120, 220, 320 ... Paper, 130, 200, 300 ... Inkjet recording device, 132,262,340 ... Paper-pressing roller, 134,210,310 ... Inkjet head, 230 ... Belt conveying section, 236 ... Belt, 330 ... Conveying drum

Claims (10)

A paper holding member having a suction surface provided with a plurality of suction holes;
An elastic member that passes air in the thickness direction disposed on the adsorption surface;
A suction means that communicates with the plurality of suction holes and sucks and holds the paper on the elastic member by sucking the suction holes under a negative pressure;
An inkjet head for recording an image by ejecting ink onto the suction-held paper;
Moving means for relatively moving the inkjet head and the paper holding member;
Equipped with a,
The elastic member has a porous structure, and is provided with a ventilation blocking member that blocks ventilation on an end surface of the elastic member,
An ink jet recording apparatus according to claim 1, wherein the suction pressure of the suction means acts on the paper on the elastic member, whereby the elastic member is compressed and deformed in the thickness direction so that the paper sinks into the elastic member . The elastic member is an ink jet recording apparatus according to claim 1, wherein the thickness direction of the cross section of the end face is formed in a V-shape. A paper holding member having a suction surface provided with a plurality of suction holes;
An elastic member that passes air in the thickness direction disposed on the adsorption surface;
A suction means that communicates with the plurality of suction holes and sucks and holds the paper on the elastic member by sucking the suction holes under a negative pressure;
An inkjet head for recording an image by ejecting ink onto the suction-held paper;
Moving means for relatively moving the inkjet head and the paper holding member;
Equipped with a,
The elastic member is formed in a V-shaped cross section in the thickness direction at the end face,
An ink jet recording apparatus according to claim 1, wherein the suction pressure of the suction means acts on the paper on the elastic member, whereby the elastic member is compressed and deformed in the thickness direction, and the paper sinks into the elastic member .   2. The elastic member is compressed and deformed in the thickness direction by the suction pressure of the suction means acting on the paper on the elastic member, and the paper sinks 0.1 mm into the elastic member. 4. The ink jet recording apparatus according to any one of items 1 to 3.   5. The ink jet recording apparatus according to claim 1, wherein an image is recorded by ink on a surface of the paper that contacts the elastic member. 6. The elastic member on the surface of the sheet abuts, an ink jet recording apparatus according to any one of claims 1 to 5, characterized in that with a paper pressing roller to adjust the height in the thickness direction of the paper . The inkjet recording apparatus according to claim 6 , further comprising an adjustment mechanism that adjusts a distance between the sheet pressing roller and the elastic member according to a thickness of the sheet. The sheet holding member is an ink jet recording apparatus according to any one of claims 1 to 7, characterized in that the sheet-like member in which a plurality of suction holes provided with a carriage which is arranged on the upper surface. The paper holding member is an endless belt having an upper surface on the outer periphery as a suction surface,
The ink jet recording according to any one of claims 1 to 7 , wherein the moving means includes a pair of rollers for guiding the endless belt and a driving means for rotating the rollers. apparatus. The paper holding member is a cylindrical drum in which a sheet-like member provided with a plurality of suction holes is arranged on the outer peripheral surface,
It said moving means, an ink jet recording apparatus according to any one of claims 1 to 7, characterized in that it comprises a driving means for rotating the drum.

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