EP3693170B1 - Folienelementfördervorrichtung und tintenstrahlaufzeichnungsvorrichtung - Google Patents

Folienelementfördervorrichtung und tintenstrahlaufzeichnungsvorrichtung Download PDF

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Publication number
EP3693170B1
EP3693170B1 EP17928060.7A EP17928060A EP3693170B1 EP 3693170 B1 EP3693170 B1 EP 3693170B1 EP 17928060 A EP17928060 A EP 17928060A EP 3693170 B1 EP3693170 B1 EP 3693170B1
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EP
European Patent Office
Prior art keywords
conveyance
section
mounting surface
recording medium
conveyance belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17928060.7A
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English (en)
French (fr)
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EP3693170A4 (de
EP3693170A1 (de
Inventor
Shinji Morita
Akira Kosugi
Sho Karakama
Junya Ichikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
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Konica Minolta Inc
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Publication date
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Publication of EP3693170A1 publication Critical patent/EP3693170A1/de
Publication of EP3693170A4 publication Critical patent/EP3693170A4/de
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Publication of EP3693170B1 publication Critical patent/EP3693170B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/007—Conveyor belts or like feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0085—Using suction for maintaining printing material flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/08—Conveyor bands or like feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet

Definitions

  • the present invention relates to a sheet member conveyance apparatus and an ink jet recording apparatus.
  • ink jet recording apparatuses for discharging ink to a sheet member, such as paper or a resin sheet, to form an image on the sheet member.
  • a sheet member conveyance apparatus for conveying a sheet member by placing the sheet member on a mounting surface of a conveyance member that moves along a predetermined movement path (e.g., a conveyance belt that moves around a predetermined circuit path) is commonly used.
  • a predetermined movement path e.g., a conveyance belt that moves around a predetermined circuit path
  • JP 2007 031007 A discloses a paper transport mechanism used in an inkjet printer.
  • An object of the present invention is to provide an ink jet recording apparatus according to claims 1 to 17 capable of more reliably adsorbing a sheet member on a mounting surface.
  • Fig. 1 is a diagram illustrating a schematic configuration of an ink jet recording apparatus 1 according to an embodiment of the present invention.
  • the ink jet recording apparatus 1 includes a recording medium supplier 10, an image recorder 20, a fixing unit 30, a recording medium ejector 40, and the like.
  • the recording medium supplier 10 includes a mounting tray 11, medium carrier rollers 12 and the like.
  • the mounting tray 11 is a plate-shaped member on which various kinds of recording medium P (sheet member), such as paper, cardboard, corrugated cardboard and a resin sheet, are piled up.
  • the uppermost recording medium P on the mounting tray is sent to the image recorder 20 one by one.
  • the mounting tray 11 is movable in the vertical direction. In accordance with, for example, the total weight of the placed recording media P, the uppermost recording medium P is kept at a position for sending the recording medium P to the image recorder 20.
  • Medium carrier rollers 12 are rotatable rollers that sandwich the recording medium P from above and below, and send the uppermost recording medium P mounted on the mounting tray 11.
  • the recording medium P is sent in a horizontal direction.
  • a guide member for aligning the recording medium P to a predetermined position in a width direction perpendicular to the conveyance direction of the recording medium P (leftward in Fig. 1 ) is attached to the medium carrier rollers 12.
  • the medium carrier rollers 12 send the recording medium P aligned in the width direction to the image recorder 20.
  • the image recorder 20 discharges ink onto the recording medium P passed from the recording medium supplier 10 to form an image. After ink lands on the recording medium P to form an image, the recording medium P is sent to the fixing unit 30.
  • the image recorder 20 comprises a medium conveyer 21 (second conveyer), a support suction unit 22, one or more (in this embodiment, four) print heads 23 that discharge ink (ink discharger), a press roller 24, and the like.
  • the medium conveyer 21 comprises a conveyance belt 211, a drive roller 212, a driven roller 213, guide rollers 214, and a tension roller 215.
  • the conveyance belt 211 of the medium conveyer 21 is an endless (circular) strip member.
  • a steel belt is used in this embodiment.
  • the steel belt is made of, for example, stainless steel such as SUS304 and SUS631 or aluminum alloy having thickness of about 0.3 mm
  • the conveyance belt 211 is provided with vents which have the same opening shape and which penetrate between the external circumference and the internal circumference of the conveyance belt 211. Specifically, a large number (plurality) of circular vents having a diameter of about 0.5 mm are arranged at about 1.4 mm intervals so that the open ratio is about 20%. Air passes between the external circumference and the internal circumference.
  • the conveyance belt 211 bridges between the drive roller 212 and the driven roller 213 (hereinafter, these rollers together are also referred to as conveyance rollers 212, 213).
  • the external circumference on which the recording medium P is mounted (hereinafter, also referred to as a mounting surface) is movable along a circuit path around the conveyance rollers 212, 213.
  • the drive roller 212 rotates in accordance with rotation driven by a conveyance motor 65 ( Fig. 2 )
  • the conveyance belt 211 moves along the circuit path around the conveyance rollers 212, 213 in accordance with the speed and the rotation direction of the rotation of the drive roller 212.
  • the drive roller 212 rotates counterclockwise on the plane of Fig.
  • a flat surface (in this embodiment, a horizontal surface) of the support suction unit 22 (hereinafter referred to as a support surface) supports the internal circumference of the conveyance belt 211 (the surface that touches the conveyance rollers 212, 213) in a range within the conveyance section of the conveyance belt 211, the range including a portion where the mounting surface of the conveyance belt 211 faces an ink discharge surface of the print heads 23.
  • the support surface of the support suction unit 22 consists of a plate-shaped vent member 223 constituted by a porous body having ventilation.
  • the support suction unit 22 has a suction fan 62 ( Fig.
  • Guide rollers 214 are provided respectively upstream and downstream from the support suction unit 22 in the conveyance direction. Two guide rollers 214 support the internal circumference of the conveyance belt 211 outside both edges of the support surface of the support suction unit 22. The guide rollers 214 respectively support the conveyance belt 211 at substantially the same height as the support surface of the support suction unit 22 to guide circumferential movement of the conveyance belt 211.
  • the press roller 24 is rotatably provided at a position opposed to the upstream guide roller 214 across the conveyance belt 211. Upstream in the conveyance direction from a position on the recording medium P where ink is discharged, the press roller 24 presses down the recording medium P on the conveyance belt 211 at an appropriate pressure and guide the recording medium P along the conveyance belt 211. Thereby the recording medium P, which has been sent from the recording medium supplier 10, is prevented from separating from the conveyance belt 211. Especially, an edge of the recording medium P is prevented from warping (curling) so that the recording medium P is more reliably adsorbed.
  • the press roller 24 may be configured such that the distance from the conveyance surface of the conveyance belt 211 is variable in accordance with the thickness or the like of the recording medium P to be conveyed.
  • the tension roller 215 presses the conveyance belt 211 from the internal circumference side at a position between the two conveyance rollers 212, 213, that is, in the middle of movement of the conveyance belt 211 from the drive roller 212 to the driven roller 213.
  • the vertical position of the tension roller 215 is adjustable at two different positions in the width direction, for example, at both edges.
  • the tension roller 215 corrects meander caused by non-uniformity of tension on the conveyance belt 211 applied by the support suction section 22 and the like. Thereby the conveyance belt 211 and the recording medium P are properly moved in the conveyance direction.
  • the print heads 23 arc provided on the side opposite to the support suction unit 22 across the conveyance belt 211.
  • the print heads 23 On the side facing the conveyance belt 211, the print heads 23 have an ink discharge surface provided with nozzle openings.
  • the print heads 23 discharge ink to the recording medium P which is transferred while being adsorbed on the mounting surface of the conveyance belt 211 by the support suction unit 22. Thus ink lands on the recording medium P.
  • the print heads 23 have one or more recording heads 231 ( Fig. 2 ) in which nozzle openings are provided in a predetermined arrangement to perform an operation relating to ink discharge from the nozzle openings.
  • a range in the width direction in which an image is formed on the recording medium P is within a range in the width direction in which the nozzles of the print heads 23 are arranged.
  • the positions of the print heads 23 are fixed while an image is recorded. Ink is discharged sequentially on different positions in the conveyance direction at predetermined intervals (intervals in the conveyance direction) as the recording medium P is conveyed. Thereby an image is formed in a single-pass manner.
  • the four print heads 23 are respectively connected to ink tanks (not shown) of colors cyan (C), magenta (M), yellow (Y) and black (K) to respectively discharge ink of these CMYK colors.
  • the image recorder 20 may include a print head 23 for discharging ink other than these four colors, such as orange, green, violet, red, blue, white, or the like, or transparent ink.
  • Ink that changes phase between gel and sol is used as ink discharged from the nozzles of the print heads 23.
  • Gel is classified as solid while Sol is classified as liquid.
  • ink that has been made gelatinous through heating is discharged from the nozzles of the print heads 23. After ink lands on the recording medium P, the ink is cooled down to be gelatinous rapidly, and solidifies on the recording medium P.
  • ink that cures under ultraviolet rays (curable material) is used.
  • Ink that contains a photopolymerizable compound (monomer), a photopolymerization initiator and a colorant are used as this kind of ink.
  • photopolymerizable compound polymerizes through polymerization reaction under ultraviolet rays.
  • the photopolymerization initiator is a compound that initiates the above polymerization reaction.
  • the colorant includes a pigment or dye of an ink color.
  • the image recorder 20 sends the recording medium P, on which ink has been discharged from the print head 23, to the fixing unit 30.
  • the fixing unit 30 is provided downstream from the image recorder 20 in the conveyance direction of the recording medium P, and fixes ink on the recording medium P passed from the image recorder 20.
  • the fixing unit 30 includes a medium conveyer 31 (first conveyer), a support suction unit 32, an ultraviolet irradiator 33 (energy provider), and the like.
  • the medium conveyer 31 has a conveyance belt 311, a drive roller 312, a driven roller 313, a guide roller 314, and a tension roller 315.
  • the configuration of the medium conveyer 31 is the same as that of the medium conveyer 21 of the image recorder 20.
  • the configuration of the support suction unit 32 is different from the support suction unit 22 of the image recorder 20 in that the ventilation member 323 of the porous body, which constitutes the support surface, is provided in a region excluding a predetermined range in the edge of the support suction unit 32 on the upstream side in the conveyance direction.
  • the support suction unit 32 having this configuration the recording medium P is reliably adsorbed on the mounting surface of the conveyance belt 211 even if the recording medium P includes a warp or the like. Therefore, the fixing unit 30 is not provided with a press roller.
  • the configuration of the support suction unit 32 will be described in detail later.
  • the ultraviolet irradiator 33 irradiates the recording medium P with ultraviolet rays, the recording medium P being conveyed while being adsorbed on the mounting surface of the conveying belt 311 by the support suction unit 32. Accordingly, ink on the recording medium P (ink that has landed on the recording medium P) cures to be fixed.
  • the recording medium P mounted on the conveyance belt 311 is irradiated with ultraviolet rays from the ultraviolet irradiator 33 without large unevenness (variation in intensity).
  • the fixing unit 30 sends the recording medium P, on which ink has been fixed, to the recording medium ejector 40.
  • the recording medium P passed from the fixing unit 30 is held on the recording medium ejector 40 until it is taken out by the user.
  • the recording medium ejector 40 includes an ejection tray 41 and guide rollers 42.
  • the guide rollers 42 sandwich the recording medium P, which has been sent from the fixing unit 30, from above and below, conveys the recording medium P, and put it on the ejection tray 41.
  • the ejection tray 41 may be set at a position lower than the mounting surface and be vertically movable in accordance with the amount of the mounted recording medium P.
  • the ink jet recording apparatus 1 has a configuration that, while the recording medium P is conveyed by the medium conveyers 21, 31, predetermined processing is performed on the recording medium P by functional configurations of the ink jet recording apparatus 1 including the medium conveying portions 21, 31, that is, the image recorder 20 and the fixing unit 30.
  • This configuration shortens the ranges in which the recording medium P is placed on the conveyance belts 211, 311 of the medium conveyers 21, 31 respectively. Therefore, it is possible to avoid decrease of accuracy in the conveyance position of the recording medium P due to expansion, contraction and uneven speed of the conveyance belts 211, 311. Accordingly, especially the image recorder 20 discharges ink to a desired position on the recording medium P. Further, it is possible to avoid problem that heat generated by the ultraviolet irradiation in the fixing unit 30 is transmitted to the recording medium P in the image recorder 20 so that the temperature of the recording medium P deviates from a proper range for discharging ink.
  • the configuration of the ink jet recording apparatus 1 is not limited to those described above.
  • a heater that heats the recording medium P to a predetermined temperature a medium processor for performing a surface modification process, such as corona treatment, for the recording medium P, and the like may be provided between the recording medium supplier 10 and the image recorder 20.
  • Fig. 2 is a block diagram illustrating the main functional configuration of the ink jet recording apparatus 1.
  • the ink jet recording apparatus 1 includes a controller 50, support suction units 22, 32 having a suction controller 61 and a suction fan 62, a print head 23 having a head controller 63 and a recording head 231, a conveyance controller 64, a conveyance motor 65, an input-output interface 66, a bus 67, and the like.
  • a hardware configuration of the controller 50 may also be used as the suction controller 61, the head controller 63, or the conveyance controller 64.
  • a dedicated CPU, a memory, a logic circuit, or the like may be provided separately.
  • the controller 50 includes a CPU 51 (Central Processing Unit), a RAM 52 (Random Access Memory), a ROM 53 (Read Only Memory), and a memory 54.
  • CPU 51 Central Processing Unit
  • RAM 52 Random Access Memory
  • ROM 53 Read Only Memory
  • the CPU 51 reads the program and setting data stored in the ROM 53 for various control, stores them in the RAM 52, and execute the program to perform various arithmetic processes. In addition, the CPU 51 oversees and controls the entire operation of the ink jet recording apparatus 1.
  • the RAM 52 provides the CPU 51 with a memory space for working and stores temporary data.
  • the RAM 52 may include a non-volatile memory.
  • the ROM 53 stores various control programs and setting data executed by the CPU 51.
  • a rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or a flash memory may be used instead of the ROM 53.
  • the memory 54 stores a print job (image recording instruction) input from the external device 2 through the input-output interface 66 and image data of an image to be recorded by the print job.
  • a print job image recording instruction
  • a HDD Hard Disk Drive
  • a DRAM Dynamic Random Access Memory
  • Suction controller 61 rotates the suction fan 62 of the support suction unit 22, 32 at a rotational speed corresponding to the control signal from the controller 50.
  • the head controller 63 outputs various control signals and image data to a head driver in the recording head 231 at appropriate time in accordance with a control signal from the controller 50. Thereby ink is discharged from the nozzle opening of the recording head 231.
  • the conveyance controller 64 controls operation of the conveyance motors 65 respectively connected to the medium carrier roller 12 and the drive rollers 212, 312 to rotate these rollers.
  • the recording medium P is conveyed at an appropriate speed.
  • the input-output interface 66 mediates transmission and reception of data between the external device 2 and the controller 50.
  • the input-output interface 66 may comprise, for example, one of various serial interfaces or various parallel interfaces, or a combination thereof.
  • the bus 67 is a path for transmitting and receiving signals between the controller 50 and other configurations.
  • the external device 2 is, for example, a personal computer, and supplies print jobs, image data, etc. to the controller 50 via the input-output interface 66.
  • the medium conveyers 21, 31, the support suction units 22, 32, the conveyance controller 64, and the conveyance motors 65 constitute the sheet member conveyance apparatus.
  • the medium conveyers 21, 31 constitute a conveyer.
  • the present invention may be applied such that the medium conveyer 31 alone constitutes the conveyer.
  • Fig. 3A is a plan view of the support suction unit 32 as seen from the ultraviolet irradiator 33 side.
  • each configuration is shown through the conveyance belt 311, and vents provided in the conveyance belt 311 are omitted.
  • Fig. 3B is a cross-sectional view in line A-A of Fig. 3A .
  • Support suction unit 32 includes a cuboid housing 321, a ventilation member 323, a suction fan 62, and the like.
  • the cuboid housing 321 is opened on the side of the conveyance belt 311.
  • the ventilation member 323 consists of a plate-shaped porous body that partially closes the open side of the housing 321.
  • the suction fan 62 sucks air from the housing 321.
  • the open side of the housing 321 is covered with the conveyance belt 311. Thereby, an air chamber 322 is formed inside the housing 321.
  • the suction fan 62 sucks air from the air chamber 322 through a suction port 321a opened in a part of the lower portion of the housing 321.
  • the housing 321 is made of a metal plate such as stainless steel or aluminum alloy having a thickness of some millimeters.
  • the lengths of the housing 321 in the width direction and in the conveyance direction are appropriately determined in accordance with the size, shape, and the like of the recording medium P to be conveyed by the medium conveyer 31.
  • the suction port 321a is provided in the vicinity of the edge of the bottom surface of the housing 321 on the upstream side in the conveyance direction.
  • the position of the suction port 321a is not limited thereto.
  • the ventilation member 323 is a plate-shaped porous body having a thickness of about 5 mm fixed to the housing 321 along the open side of the housing 321 (i.e., along the movement path of the conveyance belt 311).
  • the ventilation member 323, as seen in a direction perpendicular to the mounting surface of the conveyance belt 311, is provided in a range overlapping a second section R2 which corresponds to a range of the air chamber 322 excluding a first section R1 in a predetermined range at the edge on the upstream side in the conveyance direction. Therefore, in the first section R1, the air chamber 322 is not provided with the ventilation member 323, and the upper side of the housing 321 is opened.
  • the ventilation member 323 is disposed in this way, in the first section R1, ventilation between the air chamber 322 and the mounting surface side of the conveyance belt 311 is maintained along a ventilation path that passes not through the ventilation member 323 but through the vents 311a of the conveyance belt 311. In the second section R2, ventilation between the air chamber 322 and the mounting surface side of the conveyance belt 311 is maintained along a ventilation path through the vents 311a of the conveyance belt 311 and through the ventilation member 323.
  • the length of the first section R1 in the air chamber 322 in the conveyance direction is not particularly limited as long as it is set to be longer than a length in which an edge Pc of the recording medium P could warp. This is for sufficiently achieving effect that the warped edge Pc of the recording medium P is adsorbed on the mounting surface, which will be described later.
  • the length of the second section R2 in the air chamber 322 in the conveyance direction is set at, for example, approximately the length of the recording medium P in the conveyance direction (based on a standard length, the maximum length, or the like among various lengths of the recording medium P to be conveyed). More preferably, the length of the second section R2 in the conveyance direction is set to be longer than the maximum length of the recording medium P so that the entire recording medium P is adsorbed within the second section R2. Therefore, usually, the length of the second section R2 in the conveyance direction is set at a length longer than the length of the first section R1 in the conveyance direction, and is several times or more than ten times as long as the length of the first section R1 in the conveyance direction.
  • the ultraviolet irradiator 33 is disposed on the side opposite to the second section R2 of the air chamber 322 across the conveyance belt 311 (see Fig. 1 ).
  • the length of the first section R1 and the second section R2 in the width direction (i.e., the length of the housing 321 and the ventilation member 323 in the width direction) is set at a length equal to or longer than the maximum length in the width direction of the recording medium P to be conveyed.
  • the porous body constituting the ventilation member 323 is made by sintering, for example, resin particles such as polyethylene resin, fluororesin, and polypropylene resin. Netlike pores spreading three-dimensionally inside the porous body constitute ventilation paths. This achieves three-dimensional ventilation.
  • the frictional resistance between the conveyance belt 311 and the ventilation member 323 constituted by the porous body of the above material is low. Therefore, it is possible to avoid damage to the conveyance belt 311, and to reduce a load on the conveyance motor 65. While the conveyance belt 311 slides on the ventilation member 323, wear powder is hardly generated since the frictional resistance is low as described above.
  • the suction fan 62 sucks air from the air chamber 322 through the suction port 321a with a suction force controlled by the suction controller 61, and discharges air. Thus a negative pressure is created in the air chamber 322.
  • suction through the ventilation member suction through the ventilation member
  • Fig. 4 is a diagram illustrating the suction characteristics of the direct suction and the suction through the ventilation member.
  • Fig. 4 shows the relation between the direct suction and the suction through the ventilation member concerning drawing power and adsorption sustainability.
  • the drawing power is a force for drawing the recording medium P, which is separated from (floating on) the mounting surface of the conveyance belt 311 by a predetermined distance in the vertical direction, to the mounting surface.
  • the adsorption sustainability is a force for keeping an adsorption state by preventing the recording medium P, which is adsorbed on the mounting surface, from separating from the mounting surface or from sliding on the mounting surface.
  • the "L” in Fig. 4 indicates that the drawing power or the adsorption sustainability is larger than the "S". As shown in Fig. 4 , the drawing power in the direct suction is larger than that in the suction through the ventilation member. The adsorption sustainability in the suction through the ventilation member is larger than that in the direct suction. Reasons will be described below.
  • Suction of air by the suction fan 62 causes pressure loss in the vents 311a of the conveyance belt 311 and in the ventilation member 323.
  • Pressure loss is caused by loss due to friction between air and walls of an air flow path, contracted flow due to decrease in an area of a flow path, separation of air flow due to increase in an area of a flow path, loss at an inlet and an outlet of a flow path, and the like.
  • the open area and the open ratio of the vents 311a is large enough with respect to the velocity and viscosity of air.
  • the length (depth) in the vertical direction is sufficiently small. Therefore, pressure loss at the vents 311a is very little.
  • the fine pores in the porous body of the ventilation member 323 constitute air flow paths, pressure loss due to various factors described above is larger than that in the vents 311a. Therefore, pressure loss along the ventilation path through the vents 311a and the ventilation member 323 in the suction through the ventilation member in the second section R2 is larger than pressure loss along the ventilation path through the vents 311a in the direct suction in the first section R1 by an amount corresponding to pressure loss in the ventilation member 323.
  • the drawing power of the direct suction in the first section R1 is larger than that of the suction through the ventilation member in the second section R2.
  • the region around the recording medium P as seen from a direction perpendicular to the mounting surface i.e., both sides of the recording medium P in the width direction as well as the upstream and downstream sides in the conveyance direction
  • air is sucked into the air chamber 322 from the mounting surface side of the conveyance belt 311.
  • the ventilation member 323 with large pressure loss seals the upper surface of the air chamber 322 with a certain degree of airtightness. Since the difference in the atmospheric pressure between the air chamber 322 and the mounting surface side of the conveyance belt 311 is large, the recording medium P is strongly pressed against the mounting surface by the difference. Thus the adsorption sustainability to adsorb and keep the recording medium P on the mounting surface increases.
  • the adsorption sustainability of the suction through the ventilation member in the second section R2 is larger than that of the direct suction in the first section R1.
  • the first section R1 where the drawing power is large, is provided upstream in the conveyance direction. Therefore, even if the edge Pc on the front side of the recording medium P warps (floats on the mounting surface), it is possible to draw and adsorb the edge Pc on the mounting surface by the direct suction when the recording medium P is conveyed by the conveyance belt 311 to the first section R1.
  • the recording medium P adsorbed on the mounting surface is conveyed in the conveyance direction to the second section R2
  • the recording medium P is adsorbed with a strong adsorption sustainability by the suction through the ventilation member. Therefore, the edge Pc of the recording medium P is prevented from floating on the mounting surface again or sliding on the mounting surface. Thus problems are avoided.
  • the controller 50 controls the rotation speed of the suction fan 62 such that the rotation speed is equal to or more than the minimum rotation speed that achieves a drawing power large enough to draw and adsorb the warped edge Pc of the recording medium P.
  • the minimum rotation speed varies in accordance with various parameters such as the type (thickness, hardness, ventilation, etc.) of the conveyed recording medium P, the size of an assumed warpage (height from the mounting surface), the width in the width direction of the recording medium P (i.e., the width of the portion of the first section R1 not covered by the recording medium P), and the like. Therefore, the rotational speed of the suction fan 62 is predetermined in accordance with, for example, each combination of these parameters. Alternatively, an edge Pc of one of recording media P to be used may be made to warp, and then conveyed. The rotation speed is set at a speed in which the edge Pc is actually adsorbed.
  • the recording medium P On the recording medium P mounted on the mounting surface of the conveyance belt 311 in the fixing unit 30, ink discharged in the image recorder 20 has not cured. Therefore, if the surface of the recording medium P with a warped edge Pc is pressed by a press roller, uncured ink on the recording medium P touches the press roller to distort an image, or the press roller is contaminated with ink. It is unfavorable.
  • the recording medium P is adsorbed on the mounting surface and is conveyed to a position facing the ultraviolet irradiator 33 without such problems.
  • the ventilation member 223 is provided all over the surface of the housing, and the suction through the ventilation member is performed in the entire support suction unit 22.
  • the edge Pc of the recording medium P warps
  • the edge Pc is pressed against the mounting surface by the press roller 24 as described above, and is adsorbed on the mounting surface. This is because, since ink is not discharged to the recording medium P in the image recorder 20, the above problems do not happen when the press roller 24 directly presses the surface of the recording medium P.
  • recording operation of an image begins when a print job is stored in the memory 54 of the controller 50.
  • a control signal is output from the suction controller 61 to each suction fan 62 of the support suction units 22, 32. Rotation operation of each suction fan 62 at a predetermined rotational speed begins.
  • a control signal is output from the conveyance controller 64 to the conveyance motors 65 respectively connected to the medium carrier rollers 12 and the drive rollers 212, 312. Then supply operation of the recording medium P from the recording medium supplier 10 to the medium conveyer 21 of the image recorder 20 and conveyance operation of the recording medium P by the medium conveyers 21, 31 begin.
  • the head controller 63 supplies image data of an image to be recorded and a control signal to each recording head 231 of the print head 23. Thereby ink is discharged from the nozzle of the print head 23, and an image is recorded on the recording medium P.
  • the recording medium P is adsorbed and fixed on the mounting surface of the conveyance belt 211 with a strong adsorption sustainability by the suction through the ventilation member in the support suction unit 22. This prevents erroneous recording caused by floating or vibration of the recording medium P.
  • the recording medium P on which ink has been discharged is passed from the medium conveyer 21 of the image recorder 20 to the medium conveyer 31 of the fixing unit 30.
  • the recording medium P is effectively drawn and adsorbed on the mounting portion of the conveyance belt 311 by the direct suction in a portion of the support suction unit 32 overlapping with the first section R1 as described above.
  • the recording medium P is conveyed to a portion overlapping with the second section R2, and the recording medium P is adsorbed and fixed on the mounting surface of the conveyance belt 211 with a strong adsorption sustainability by the suction through the ventilation member.
  • the ultraviolet irradiator 33 performs curing and fixation of ink on the recording medium P in this state. This prevents erroneous fixation caused by floating or vibration of the recording medium P.
  • the recording medium P is ejected to the recording medium ejector 40 by conveyance operation of the medium conveyer 31.
  • Fig. 5A and Fig. 5B are cross-sectional views showing a configuration of the support suction unit 32 according to the modification.
  • the ventilation member 323 is provided in a range overlapping with the entire air chamber 322 as seen in a direction perpendicular to the mounting surface of the conveyance belt 311. Portions of the ventilation member 323 in Fig. 5A and Fig. 5B overlapping with the first section R1 and the second section R2 respectively have a flat plate shape. The material, shape and arrangement of the ventilation member 323 is determined such that pressure loss in the portion overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2.
  • the ventilation member 323 consists of a first portion 3231 and a second portion 3232.
  • the first portion 3231 is provided in a range overlapping with the first section R1, and is constituted by a porous body with coarse pores.
  • the second portion 3232 is provided in a range overlapping with the second section R2, and is constituted by a porous body with pores finer than those in the first portion 3231.
  • the open ratio of the pores in a cross section parallel to the mounting surface of the first portion 3231 is larger than the open ratio of the pores in a cross section parallel to the mounting surface of the second portion 3232.
  • the porosity of the porous body of the first portion 3231 is larger than the porosity of the porous body of the second portion 3232.
  • pressure loss in the portion overlapping with the first section R1 of the ventilation member 323 is smaller than pressure loss in the portion overlapping with the second section R2.
  • the thickness in the direction perpendicular to the mounting surface in the first portion 3233 overlapping with the first section R1 is smaller than the thickness in the direction perpendicular to the mounting surface in the second portion 3234 overlapping with the second section R2.
  • the fineness of the porous body (i.e., the open ratio of the pores in a cross section parallel to the mounting surface) in each of the first portion 3233 and the second portion 3234 is the same as that of the porous body constituting the ventilation member 323 of the above embodiment.
  • pressure loss in the portion of the ventilation member 323 overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2.
  • the suction through the ventilation member is performed in both the first section R1 and the second section R2.
  • Pressure loss in the portion overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2. Therefore, like the above embodiment, the drawing power is larger in the first section R1 than in the second section R2 while the adsorption sustainability is larger in the second section R2 than in the first section R1.
  • the front edge of the recording medium P is securely adsorbed in the first section R1 while the recording medium P is adsorbed with a high adsorption sustainability in the second section R2.
  • the first portion and the second portion of the ventilation member 323 may be different in both the fineness and the thickness of the pores.
  • Fig. 6A to Fig. 6C are cross-sectional views showing a configuration of the support suction unit 32 according to the modification.
  • the ventilation member 323 is made of a flat metal plate provided with through holes 323a (323b) penetrating in the direction perpendicular to the mounting surface.
  • the material of the ventilation member 323 is not limited to metal. A material which is strong enough to support the conveyance belt 311 and which has low friction against the conveyance belt 311, such as resin, may be used.
  • the material, shape and arrangement of the ventilation member 323 in Fig. 6A to Fig. 6C is also determined such that pressure loss in the portion overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2.
  • the ventilation member 323 made of a metal plate is provided only in a region overlapping with the second section R2.
  • the direct suction is performed in the first section R1 while the suction through the ventilation member is performed in the second section R2.
  • the front edge of the recording medium P is securely adsorbed in the first section R1 while the recording medium P is adsorbed with a high adsorption sustainability in the second section R2.
  • the ventilation member 323 is provided in a range overlapping with the entire air chamber 322.
  • the open area of the through holes 323a in the first portion 3235 overlapping with the first section R1 is larger than the open area of the through holes 323b in the second portion 3236 overlapping with the second section R2.
  • the open ratio of the through holes 323a in a cross section parallel to the mounting surface in the first portion 3231 is larger than the open ratio of the through holes 323b in a cross section parallel to the mounting surface in the second portion 3232.
  • pressure loss in the portion overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2.
  • the ventilation member 323 is provided in a range overlapping with the entire air chamber 322.
  • the thickness of the ventilation member 323 in the direction perpendicular to the mounting surface in the first portion 3237 overlapping with the first section R1 is smaller than the thickness in the direction perpendicular to the mounting surface in the second portion 3238 overlapping with the second section R2.
  • the through holes 323a in the first portion 3237 and the second portion 3238 have the same open area and the same open ratio.
  • pressure loss in the portion overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2.
  • the suction through the ventilation member is performed in both the first section R1 and the second section R2.
  • Pressure loss in the portion overlapping with the first section R1 is smaller than pressure loss in the portion overlapping with the second section R2. Therefore, like the above embodiment, the drawing power is larger in the first section R1 than in the second section R2 while the adsorption sustainability is larger in the second section R2 than in the first section R1.
  • the front edge of the recording medium P is securely adsorbed in the first section R1 while the recording medium P is adsorbed with a high adsorption sustainability in the second section R2.
  • the first portion and the second portion of the ventilation member 323 may be different in the open area and the open ratio of the through holes as well as the thickness.
  • Fig. 7 is a cross-sectional view showing a configuration of the support suction unit 32 according to the modification.
  • the air chamber 322 is partitioned into a first sub chamber 3221 constituting the first section R1 and a second sub chamber 3222 constituting the second section R2.
  • the first sub chamber 3221 and the second sub chamber 3222 are partitioned by a partition 3211 which is welded to be fixed to the bottom and sides of the housing 321, so that ventilation is not directly performed between them.
  • Each of the first sub chamber 3221 and the second sub chamber 3222 is provided with a suction port 321a, and inner air is sucked by an individual suction fan 62 (the first suction fan and the second suction fan). Rotation operation of each suction fan 62 is individually controlled by the suction controller 61.
  • Fig. 8 is a plan view showing a configuration of the support suction unit 32 according to the modification.
  • the ventilation member 323 of the support suction unit 32 in Fig. 8 consists of a first portion 3231 and a second portion 3232.
  • the second portion 3232 is provided in the vicinity of both edges in the width direction, and is constituted by a porous body with fine pores.
  • the first portion 3231 is provided in a portion excluding the vicinity of both edges in the width direction, and is constituted by a porous body with pores coarser than those in the second portion 3232. According to this configuration, pressure loss in the vicinity of both edges in the width direction of the second section R2 is larger than pressure loss in the center in the width direction.
  • the ventilation member 323 in the outer portion in the width direction of the recording medium P is sealed to a high extent. Therefore, the difference in the atmospheric pressure between the air chamber 322 and the conveyance surface side of the conveyance belt 311 increases more effectively. Thus power for adsorbing and keeping the recording medium P increases.
  • Fig. 9 is a diagram illustrating a schematic configuration of the ink jet recording apparatus 1 according to the modification.
  • the ink jet recording apparatus 1 includes the relay 70 at a position which is downstream from the image recorder 20 in the conveyance direction and which is upstream from the fixing unit 30 in the conveyance direction.
  • the relay 70 adsorbs the recording medium P passed from the image recorder 20 and conveys it to the fixing unit 30 in the conveyance direction.
  • the relay 70 includes a medium conveyer 71 and a support suction unit 72.
  • the medium conveyer 71 includes a conveyance belt 711 (first conveyance belt), a drive roller 712, a driven roller 713, and a tension roller 715 (first conveyance roller).
  • the medium conveyer 71 of the relay 70 and the medium conveyer 31 of the fixing unit 30 constitute the first conveyer.
  • the configuration of the conveyance belt 711 is substantially the same as that of the conveyance belt 311 (second conveyance belt) of the fixing unit 30.
  • the configurations of the drive roller 712, the driven roller 713, and the tension roller 715 are almost the same as those of the drive roller 312, the driven roller 313, and the tension roller 315 (second conveyance roller) of the fixing unit 30.
  • the diameters of the drive roller 712 and the driven roller 713 are smaller than the diameters of the drive roller 312 and the driven roller 313.
  • the diameter of the drive roller 712 closest to the rear edge el of the conveyance path of the recording medium P on the conveyance belt 711 is smaller than the diameter of the driven roller 313 closest to the front edge e2 of the conveyance path of the recording medium P on the conveyance belt 311 among the second conveyance rollers in the medium conveyer 31.
  • the conveyance path of the recording medium P on the conveyance belt 311, 711 refers to a path in which the recording medium P is conveyed while being placed on the mounting surface of the conveyance belt 311 and 711.
  • the distance in the conveyance direction between the drive roller 712 and the driven roller 713 is smaller than the distance in the conveyance direction between the drive roller 312 and the driven roller 313.
  • the circumferential length of the conveyance belt 711 is shorter than the circumferential length of the conveyance belt 311.
  • the configuration of the support suction unit 72 is the same as that of the support suction unit 32 except that the length in the conveyance direction is shorter than that of the support suction unit 32 and that a member corresponding to the ventilation member 323 is not provided. Accordingly, the entire support suction unit 72 performs the direct suction to adsorb the recording medium P on the mounting surface of the conveyance belt 711.
  • the air chamber in the support suction unit 72 constitutes an upstream chamber while the air chamber in the support suction unit 32 constitutes a downstream chamber.
  • the relay 70 achieves the following effects. In a case in which the recording medium P is directly passed from the image recorder 20 to the fixing unit 30, the length of a section where the recording medium P is not adsorbed is long since the diameters of the drive roller 212 and the driven roller 313 are large. On the other hand, in a case in which the conveyance of the recording medium P is relayed by the relay 70, which includes the drive roller 712 and the driven roller 713 with smaller diameters, the length of the section where the recording medium P is not adsorbed is short. Even if an edge of the recording medium P warps, it is possible to reliably draw and adsorb the edge on the mounting surface of the conveyance belt 711 since the recording medium P is adsorbed by the direct suction in the relay 70.
  • the ventilation member 323 may be provided all over the upper side of the housing 321 in the support suction unit 32 of the fixing unit 30 as shown in Fig. 10 .
  • the ventilation member 323 may be provided all over the upper side of the housing 321 in the support suction unit 32 of the fixing unit 30 as shown in Fig. 10 .
  • the sheet member conveyance apparatus includes:
  • the air chamber 322 comprises:
  • the ventilation member 323 is provided such that, when the suction fan 62 sucks air from the air chamber 322, pressure loss in the ventilation path from the mounting surface side of the conveyance belt 311 to the first section R1 is smaller than pressure loss from the mounting surface side of the conveyance belt 311 to the second section R2.
  • the recording medium P is strongly pressed against the mounting surface by the difference in the atmospheric pressure, and the recording medium P is adsorbed on the mounting surface with a higher adsorption sustainability.
  • an edge of the recording medium P is reliably drawn and adsorbed to the mounting surface in the first section R1 while, in the second section R2 which is downstream from the first section R1 in the conveyance direction, the recording medium P is adsorbed and kept on the mounting surface with a high adsorption sustainability.
  • the ventilation member 323 is provided in a range overlapping with the second section R2 as seen in the direction perpendicular to the mounting surface.
  • the first section R1 in the air chamber 322 is ventilated along a ventilation path that does not pass through the ventilation member 323. Therefore, pressure loss by the ventilation member 323 does not occur in the first section R1. Pressure loss in the first section R1 is suppressed, and power to draw the recording medium P to the mounting surface is increased.
  • the ventilation member 323 of Modifications 1 and 2 ( Fig. 6B and Fig. 6C ) is provided in a range overlapping with the first section R1 and the second section R2 as seen in the direction perpendicular to the mounting surface.
  • the first section R1 in the air chamber 322 is ventilated along a ventilation path through the ventilation member 323. Therefore, the ventilation member 323 supports the conveyance belt 311 over the entire air chamber 322. Accordingly, the mounting surface of the conveyance belt 311 and the recording medium P on the mounting surface are kept flat in a wider range.
  • each of portions of the ventilation member 323 overlapping with the first section R1 and the second section R2 has a flat plate shape.
  • the thickness of the portion overlapping with the first section R1 in the direction perpendicular to the mounting surface is smaller than the thickness of the portion overlapping with the second section R2 in the direction perpendicular to the mounting surface. Therefore, it is easy to make pressure loss in the ventilation path in the first section R1 smaller than pressure loss in the ventilation path in the second section R2.
  • the drawing power for the recording medium P in the first section R1 and the adsorption sustainability in the second section R2 are increased.
  • the ventilation member 323 is constituted by the porous body, it is possible to realize the ventilation member 323 having ventilation while supporting the conveyance belt 311 with a simple configuration. Since the entire surface of the ventilation member 323 has ventilation, constant ventilation between the air chamber 322 and the mounting surface side of the conveyance belt 311 is performed regardless of positions of the vents 311a corresponding to conveyance of the conveyance belt 311.
  • the open ratio of pores in a cross section parallel to the mounting surface in the portion overlapping with the first section R1 is larger than the open ratio of pores in the cross section parallel to the mounting surface in the portion overlapping with the second section R2. Therefore, it is possible to make pressure loss in the ventilation path in the first section R1 smaller than pressure loss in the ventilation path in the second section R2. Thus the drawing power for the recording medium P in the first section R1 and the adsorption sustainability in the second section R2 are increased.
  • the ventilation member 323 of Modification 2 is constituted by a plate provided with through holes 323a (323b) penetrating in the direction perpendicular to the mounting surface.
  • the ventilation member 323 having ventilation while supporting the conveyance belt 311 with a simple configuration.
  • the open ratio of through holes 323a in the cross section parallel to the mounting surface in the portion overlapping with the first section R1 is larger than the open ratio of through holes 323b in the cross section parallel to the mounting surface in the portion overlapping with the second section R2. Therefore, it is possible to make pressure loss in the ventilation path in the first section R1 smaller than pressure loss in the ventilation path in the second section R2. Thus the drawing power for the recording medium P in the first section R1 and the adsorption sustainability in the second section R2 are increased.
  • the air chamber 322 consists of the first section R1 within the predetermined range from the edge of the air chamber 322 on the upstream side in the conveyance direction, and the second section R2 which is the region other than the first section R1. Therefore, the adsorption state of the recording medium P drawn to the mounting surface in the first section R1 near the edge of the air chamber 322 on the upstream side in the conveyance direction is reliably kept in the second section R2 which extends to the downstream edge of the air chamber 322.
  • the air chamber 322 of Modification 3 includes a first sub chamber 3221 that constitutes the first section R1 and a second sub chamber 3222 that constitutes the second section R2. Ventilation is not directly performed between the first sub chamber 3221 and the second sub chamber 3222.
  • the suction fan 62 sucks air through the first sub chamber 3221 and the second sub chamber 3222 respectively. Therefore, the negative pressure in the second section R2 is easily increased, and thus the absorption sustainability in the second section R2 is increased.
  • the suction fan 62 of Modification 3 includes the first suction fan that sucks air through the first sub chamber 3221, and the second suction fan that sucks air through the second sub chamber 3222. Therefore, it is possible to separately adjust the drawing power in the first section R1 and the adsorption sustainability in the second section R2.
  • the conveyance belt 311 is a circular conveyance belt, and the external circumference of the circular conveyance belt constitutes the mounting surface.
  • the medium conveyer 31 moves the conveyance belt 311 along a predetermined circuit path.
  • the ventilation member 323 and the air chamber 322 are provided on the internal circumference side of the conveyance belt 311. Therefore, the recording medium P is more reliably adsorbed on the external circumference of the conveyance belt 311 in the medium conveyer 31 that has a simple and compact configuration for rotating the conveyance belt 311.
  • the sheet member conveyance apparatus of Modification 5 includes:
  • the medium conveyers 71, 31 move the conveyance belt 711 and the conveyance belt 311 along respective predetermined circuit paths to convey the recording medium P in the conveyance direction while passing the recording medium P between the conveyance belt 711 and the conveyance belt 311.
  • the ventilation member 323 is provided on the internal circumference side of the conveyance belt 311.
  • the air chamber 322 is partitioned into:
  • the edge is drawn and adsorbed to the mounting surface of the conveyance belt 711 on the upstream side.
  • the recording medium P is passed to the conveyance belt 311 on the downstream side while the edge is pressed to suppress warping. Therefore, the recording medium P is reliably adsorbed also on the conveyance belt 311.
  • the medium conveyer 71 rotates at least one of the first conveyance rollers, around which the conveyance belt 711 is stretched, to move the conveyance belt 711.
  • the medium conveyer 31 rotates at least one of the second conveyance rollers, around which the conveyance belt 311 is stretched, to move the conveyance belt 311.
  • the diameter of the drive roller 712 closest to the rear edge el of the conveyance path of the recording medium P on the conveyance belt 711 is smaller than the diameter of the driven roller 313 closest to the front edge e2 of the conveyance path of the recording medium P on the conveyance belt 311 among the second conveyance rollers. Therefore, a section where the recording medium P is not adsorbed is shortened.
  • the recording medium P is more reliably adsorbed on the mounting surface of the conveyance belt 311 on the downstream side.
  • the ink jet recording apparatus 1 in the above embodiment and modifications includes:
  • the print head 23 discharges ink, which cures in response to the application of ultraviolet rays, from the nozzle.
  • the ink jet recording apparatus 1 includes the ultraviolet irradiator 33 which is provided on the side opposite to the second section R2 of the air chamber 322 across the conveyance belt 311 and which irradiates ink, which has landed on the recording medium P adsorbed on the mounting surface, with ultraviolet rays.
  • the ink before ink cures and be fixed, the ink is applied to the surface of the recording medium P placed on the mounting surface of the conveyance belt 311.
  • the recording medium P is drawn and adsorbed to the mounting surface by suction of air from the air chamber 322 in the first section R1. This prevents a problem that ink on the recording medium P touches other member to disturb an image.
  • the conveyer of the sheet member conveyance apparatus includes:
  • the medium conveyer 21 and the medium conveyer 31 move the recording medium P in the conveyance direction while passing the recording medium P between the medium conveyer 21 and the medium conveyer 31.
  • the print head 23 discharges ink from the nozzle to the recording medium P being conveyed by the medium conveyer 21.
  • the recording medium P on which ink has been discharged by the print head 23, is passed between the medium conveyer 21 and the medium conveyer 31, and the medium conveyer 31 conveys the recording medium P without contaminating the surface of the recording medium P.
  • pressure loss in the ventilation path changes at two stages in the first section R1 and the second section R2.
  • the material, shape and arrangement of the ventilation member 323 may be determined such that pressure loss gradually increases toward the downstream side in the conveyance direction.
  • a section where pressure loss is at an intermediate value between pressure losses in the first section R1 and the second section R2 may be provided between the first section R1 and the second section R2.
  • the air chamber 322 consists of the single first section R1 and the single second section R2
  • the invention may have any configuration as long as at least one first section R1 and at least one second section R2 downstream from the first section R1 in the conveyance direction are provided.
  • the air chamber 322 may have one first section R1 and two second sections R2 disposed on both sides of the first section R1 in the conveyance direction.
  • a porous body and a metal plate are used for the ventilation member 323.
  • any material may be used as long as pressure loss occurs in the ventilation path in the ventilation member 323 when air is sucked through the ventilation member 323.
  • a strip-shaped conveyance belt is given as an example of the conveyance member.
  • the invention is not limited thereto.
  • the present invention may be applied to a conveyer that conveys a recording medium P by rotation of a cylindrical conveyance drum as the conveyance member.
  • the support suction unit (the air chamber and the ventilation member) fixed to the rotation shaft is provided along a curved surface (internal circumference) inside the external circumference of the conveyance drum.
  • the rotating drum is provided with vents.
  • the support suction unit sucks air to adsorb the recording medium P on the drum surface.
  • a mounting member may reciprocate in the conveyance direction in a movement range including a region above the support suction unit.
  • ultraviolet curable ink is given as an example of ink discharged from the nozzle of the print head 23.
  • the invention is not limited thereto.
  • Various materials that polymerize and cure when certain energy is given may be used as ink.
  • a thermosetting material that polymerizes when heated an electron beam curable material that polymerizes when irradiated with an electron beam, and the like may be used.
  • the ink jet recording apparatus 1 of a single pass system is given as an example.
  • the present invention may be applied to an ink jet recording apparatus that records an image while scanning with a print head or a recording head.
  • the present invention can be utilized in an ink jet recording apparatus.

Landscapes

  • Ink Jet (AREA)
  • Handling Of Sheets (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Claims (17)

  1. Ein Tintenstrahlaufzeichnungsgerät, umfassend:
    einen Aufzeichnungsmedium-Zuführer (10), einen Bildaufzeichner (20), eine Fixiereinheit (30) und einen Aufzeichnungsmedium-Auswerfer (40);
    der Bildaufzeichner (20) ist dazu eingerichtet, Tinte auf ein Blattelement (P) auszustoßen, das von dem Aufzeichnungsmedium-Zuführer (10) weitergegeben wird, um ein Bild zu erzeugen;
    die Fixiereinheit (30) ist stromabwärts von dem Bildaufzeichner (20) in der Förderrichtung eines Aufzeichnungsmediums vorgesehen und dazu eingerichtet, Tinte auf dem von dem Bildaufzeichner (20) weitergegebenen Aufzeichnungsmedium (P) zu fixieren; und
    eine Blattelement-Fördervorrichtung, die dazu eingerichtet ist, ein Blattelement (P) zu fördern, auf dem von dem Bildaufzeichner (20) abgegebene Tinte gelandet ist,
    wobei die Blattelement-Fördervorrichtung umfasst:
    einen Förderer (21, 31), der dazu eingerichtet ist, ein Förderelement (211, 311, 711) in einer Förderrichtung zu bewegen, um ein Blattelement (P) zu fördern, das auf einer Aufnahmefläche des Förderelements (211, 311, 711) platziert ist;
    ein Lüftungselement (223, 323), das auf einer der Aufnahmefläche des Förderelements (211, 311, 711) gegenüberliegenden Seite entlang eines Bewegungspfads in der Förderrichtung des Förderelements (211, 311, 711) vorgesehen ist und dazu eingerichtet ist, in einer Richtung senkrecht zu der Aufnahmefläche zu lüften;
    wobei die Fixiereinheit eine Luftkammer (322) umfasst, die auf der der Aufnahmefläche des Förderelements (311) gegenüberliegenden Seite entlang des Bewegungspfads in einem Bereich vorgesehen ist, der eine Region umfasst, die mit dem Lüftungselement (323) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche, so dass die Lüftung zwischen der Luftkammer (322) und einer Aufnahmeflächenseite des Förderelements (311) durch in dem Förderelement (311) vorgesehene Lüftungsöffnungen (311a) aufrechterhalten wird; und
    eine Saugeinheit (32), die dazu eingerichtet ist, Luft von der der Aufnahmefläche des Förderelements (311) gegenüberliegenden Seite durch die Luftkammer (322) anzusaugen, um das Blattelement (P) an der Aufnahmefläche des Förderelements (311) anzulagern,
    wobei
    die Luftkammer (322) umfasst:
    einen ersten Abschnitt (R1) innerhalb eines vorbestimmten Bereichs in der Förderrichtung; und
    einen zweiten Abschnitt (R2), der stromabwärts von dem ersten Abschnitt (R1) in der Förderrichtung vorgesehen ist und der entlang eines Lüftungspfades durch die Lüftungsöffnungen (311a) und das Lüftungselement (323) gelüftet wird, und
    das Lüftungselement (323) ist so vorgesehen, dass, wenn die Saugeinheit (32) Luft aus der Luftkammer (322) ansaugt, der Druckverlust in einem Lüftungspfad von der Aufnahmeflächenseite des Förderelements (311) zu dem ersten Abschnitt (R1) kleiner ist als der Druckverlust in einem Lüftungspfad von der Aufnahmeflächenseite des Förderelements (311) zu dem zweiten Abschnitt (R2).
  2. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 1, wobei
    das Lüftungselement (323) in einem Bereich vorgesehen ist, der mit dem zweiten Abschnitt (R2) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche, und
    der erste Abschnitt (R1) entlang eines Lüftungspfades gelüftet wird, der nicht durch das Lüftungselement (323) verläuft.
  3. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 1, wobei
    das Lüftungselement (323) in einem Bereich vorgesehen ist, der mit dem ersten Abschnitt (R1) und dem zweiten Abschnitt (R2) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche, und
    der erste Abschnitt (R1) entlang eines Lüftungspfades durch das Lüftungselement (323) und die Lüftungsöffnungen (311a) gelüftet wird.
  4. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 3, wobei
    sowohl ein Teil des Lüftungselements (323), der mit dem ersten Abschnitt (R1) überlappt, als auch ein Teil des Lüftungselements (323), der mit dem zweiten Abschnitt (R2) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche, eine flache Plattenform hat, und
    eine Dicke des Teils, der mit dem ersten Abschnitt (R1) in der Richtung senkrecht zur Aufnahmefläche überlappt, kleiner ist als eine Dicke des Teils, der mit dem zweiten Abschnitt (R2) in der Richtung senkrecht zur Aufnahmefläche überlappt.
  5. Das Tintenstrahlaufzeichnungsgerät gemäß einem der Ansprüche 1 bis 4, wobei das Lüftungselement (323) durch einen porösen Körper gebildet wird.
  6. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 3 oder 4, wobei
    das Lüftungselement (323) durch einen porösen Körper mit Poren gebildet ist, und
    ein Öffnungsverhältnis der Poren in einem Querschnitt parallel zur Aufnahmefläche in dem Teil, der mit dem ersten Abschnitt (R1) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche, größer ist als ein Öffnungsverhältnis der Poren in dem Querschnitt parallel zur Aufnahmefläche in dem Teil, der mit dem zweiten Abschnitt (R2) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche.
  7. Das Tintenstrahlaufzeichnungsgerät gemäß einem der Ansprüche 1 bis 4, wobei das Lüftungselement (323) durch eine Platte gebildet ist, die mit in der Richtung senkrecht zur Aufnahmefläche durchdringenden Durchgangslöchern versehen ist.
  8. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 3 oder 4, wobei
    das Lüftungselement (323) durch eine Platte gebildet ist, die mit die in der Richtung senkrecht zur Aufnahmefläche durchdringenden Durchgangslöchern versehen ist, und
    ein Öffnungsverhältnis der Durchgangslöcher in einem Querschnitt parallel zur Aufnahmefläche in dem Teil, der mit dem ersten Abschnitt (R1) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche, größer ist als ein Öffnungsverhältnis der Durchgangslöcher in dem Querschnitt parallel zur Aufnahmefläche in dem Teil, der mit dem zweiten Abschnitt (R2) überlappt, gesehen in der Richtung senkrecht zur Aufnahmefläche.
  9. Das Tintenstrahlaufzeichnungsgerät gemäß einem der Ansprüche 1 bis 8, wobei
    der erste Abschnitt (R1) der Luftkammer (322) einen vorbestimmten Bereich von einem Rand der Luftkammer (322) auf einer stromaufwärtigen Seite in der Förderrichtung einnimmt, und
    der zweite Abschnitt (R2) ein anderer Abschnitt ist als der erste Abschnitt (R1).
  10. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 9, wobei
    die Luftkammer (322) umfasst:
    eine erste Unterkammer, die den ersten Abschnitt (R1) bildet; und
    eine zweite Unterkammer, die den zweiten Abschnitt (R2) bildet,
    die Lüftung nicht direkt zwischen der ersten Unterkammer und der zweiten Unterkammer aufrechterhalten wird, und
    die Saugeinheit (32) dazu eingerichtet ist, Luft jeweils durch die erste Unterkammer und die zweite Unterkammer zu saugen.
  11. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 10, wobei die Saugeinheit (32) umfasst:
    ein erstes Sauggebläse, das dazu eingerichtet ist, Luft durch die erste Unterkammer zu saugen; und
    ein zweites Sauggebläse, das dazu eingerichtet ist, Luft durch die zweite Unterkammer zu saugen.
  12. Das Tintenstrahlaufzeichnungsgerät gemäß einem der Ansprüche 1 bis 11, wobei
    das Förderelement (211, 311, 711) ein kreisförmiges Förderband ist,
    ein Außenumfang des Förderbandes die Aufnahmefläche bildet,
    der Förderer (21, 31) dazu eingerichtet ist, das Förderband entlang einem vorbestimmten Streckenpfad zu bewegen, und
    das Lüftungselement (323) und die Luftkammer (322) an einer inneren Umfangsseite des Förderbandes vorgesehen sind.
  13. Das Tintenstrahlaufzeichnungsgerät gemäß einem der Ansprüche 1 bis 9, wobei das Förderelement (211, 311, 711) umfasst:
    ein erstes Förderband (711), das kreisförmig ist und einen Außenumfang aufweist, der die Aufnahmefläche bildet; und
    ein zweites Förderband (311), das kreisförmig ist, das stromabwärts des ersten Förderbandes (711) vorgesehen ist, und das einen Außenumfang aufweist, der die Aufnahmefläche bildet,
    der Förderer (21, 31) ist dazu eingerichtet, das erste Förderband (711) und das zweite Förderband (311) jeweils entlang vorbestimmter Streckenpfade zu bewegen, um das Blattelement (P) in der Förderrichtung zu fördern, während er das Blattelement (P) zwischen dem ersten Förderband (711) und dem zweiten Förderband (311) führt,
    das Lüftungselement (323) ist an der inneren Umfangsseite des zweiten Förderbandes (311) vorgesehen, und
    die Luftkammer (322) ist unterteilt in:
    eine stromaufwärts gelegene Kammer (72), die an der inneren Umfangsseite des ersten Förderbandes (711) vorgesehen ist und die mindestens einen Teil des ersten Abschnitts (R1) enthält; und
    eine stromabwärts gelegene Kammer (32), die an der inneren Umfangsseite des zweiten Förderbandes (311) vorgesehen ist und den zweiten Abschnitt (R2) enthält.
  14. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 13, wobei
    der Förderer (21, 31) das erste Förderband bewegt, indem er mindestens eine von ersten Förderrollen, um die das erste Förderband gespannt ist, dreht,
    der Förderer (21, 31) das zweite Förderband bewegt, indem er mindestens einer von zweiten Förderrollen, um die das zweite Förderband gespannt ist, dreht, und
    unter den ersten Förderrollen ein Durchmesser einer ersten Antriebsrolle, die am nächsten zu einer hinteren Kante eines Förderpfads des Blattelements (P) auf dem ersten Förderband liegt, kleiner ist als ein Durchmesser einer zweiten Förderrolle unter den zweiten Förderrollen, die am nächsten zu einer vorderen Kante eines Förderpfads des Blattelements (P) auf dem zweiten Förderband liegt.
  15. Ein Tintenstrahlaufzeichnungsgerät gemäß einem der Ansprüche 1 bis 14, wobei das Bildaufzeichnungsgerät umfasst:
    einen Tintenausstoßer, der dazu eingerichtet ist, Tinte aus einer Düse auf das Blattelement auszustoßen.
  16. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 15, wobei
    der Tintenausstoßer dazu eingerichtet ist, Tinte auszustoßen, die als Antwort auf die Bereitstellung einer vorbestimmten Energie aus der Düse aushärtet,
    das Tintenstrahlaufzeichnungsgerät einen Energieapplikator umfasst, der auf einer dem zweiten Abschnitt (R2) der Luftkammer (322) gegenüberliegenden Seite über das Förderelement (211, 311, 711) bereitgestellt ist, und der die vorbestimmte Energie an Tinte abgibt, die auf dem auf der Aufnahmefläche angelagerten Blattelement (P) gelandet ist.
  17. Das Tintenstrahlaufzeichnungsgerät gemäß Anspruch 15 oder 16, wobei
    der Förderer (21,31) umfasst:
    einen ersten Förderer (21, 31), der mit dem Lüftungselement (323) versehen ist, so dass die Lüftungsöffnungen (311a) Lüftungspfade zu dem ersten Abschnitt (R1) und zu dem zweiten Abschnitt (R2) bilden; und
    einen zweiten Förderer (21,31), der das Blattelement (P) in der Förderrichtung stromaufwärts vom ersten Förderer (21,31) in der Förderrichtung fördert,
    der Förderer (21,31) das Blattelement (P) in der Förderrichtung bewegt, während er das Blattelement (P) zwischen dem ersten Förderer (21,31) und dem zweiten Förderer (21,31) führt, und
    der Tintenausstoßer Tinte aus der Düse auf das Blattelement (P) ausstößt, das von dem zweiten Förderer (21,31) gefördert wird.
EP17928060.7A 2017-10-02 2017-10-02 Folienelementfördervorrichtung und tintenstrahlaufzeichnungsvorrichtung Active EP3693170B1 (de)

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JP2007083510A (ja) * 2005-09-21 2007-04-05 Fujifilm Corp 光硬化型インクジェット記録装置
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JP5125678B2 (ja) * 2008-03-27 2013-01-23 セイコーエプソン株式会社 記録装置
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JP6166213B2 (ja) * 2014-04-01 2017-07-19 京セラドキュメントソリューションズ株式会社 搬送装置およびインクジェット記録装置
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WO2019069341A1 (ja) 2019-04-11

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