WO2022004348A1 - Inkjet recording device - Google Patents

Inkjet recording device Download PDF

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Publication number
WO2022004348A1
WO2022004348A1 PCT/JP2021/022605 JP2021022605W WO2022004348A1 WO 2022004348 A1 WO2022004348 A1 WO 2022004348A1 JP 2021022605 W JP2021022605 W JP 2021022605W WO 2022004348 A1 WO2022004348 A1 WO 2022004348A1
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WO
WIPO (PCT)
Prior art keywords
ink
paper
unit
transport
belt
Prior art date
Application number
PCT/JP2021/022605
Other languages
French (fr)
Japanese (ja)
Inventor
浩昭 土屋
Original Assignee
京セラドキュメントソリューションズ株式会社
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Publication date
Application filed by 京セラドキュメントソリューションズ株式会社 filed Critical 京セラドキュメントソリューションズ株式会社
Publication of WO2022004348A1 publication Critical patent/WO2022004348A1/en

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    • 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
    • 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
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • 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
    • B41J2/17—Ink jet characterised by ink handling

Definitions

  • the present invention relates to an inkjet recording device.
  • flushing is performed to periodically eject ink from the nozzle in order to reduce and prevent clogging of the nozzle due to drying of the ink.
  • An example of such an inkjet recording device is disclosed in Patent Document 1.
  • the conventional inkjet recording apparatus disclosed in Patent Document 1 has a unit recording head that ejects ink droplets to a recording medium, a transfer belt that conveys the recording medium under the unit recording head, and a unit that sandwiches the transfer belt. It is provided with maintenance means arranged opposite to the recording head.
  • the transport belt is formed with a plurality of holes corresponding to the arrangement of the unit recording heads.
  • the maintenance means includes an ink receiving member for accommodating ink droplets of dummy printing ejected from the unit recording head. This inkjet recording device performs dummy printing when the hole of the conveyor belt faces the unit recording head. As a result, the ink droplets of the dummy print can be accommodated in the ink receiving member by passing through the holes of the transport belt so as not to adhere to the transport belt.
  • the present invention has been made in view of the above points, and the periphery of the ink receiving portion is contaminated by ink droplets during flushing in which ink is ejected to the recording head at a timing different from the ink ejection timing to the recording medium. It is an object of the present invention to provide an inkjet recording apparatus capable of suppressing such a problem.
  • the inkjet recording apparatus of the present invention includes a recording head, a transport belt, a first suction unit, an ink receiving unit, and a second suction unit.
  • the recording head has a plurality of nozzles for ejecting ink.
  • the transport belt is endless and has a plurality of holes for adsorbing the recording medium and a plurality of openings through which the ink discharged from the recording head passes, and transports the recording medium to a position facing the recording head. ..
  • the first suction unit sucks the air in the suction space facing the opposite surface of the recording medium transport surface of the transport belt through the holes and openings to attract the recording medium to the recording medium transport surface of the transport belt. ..
  • the ink receiving portion is arranged below the recording head across a transport belt, and receives the ink that has passed through the opening at the time of flushing to eject the ink to the recording head at a timing different from the timing of ejecting the ink to the recording medium.
  • the second suction unit sucks air from the space above the uppermost surface of the ink stored in the ink receiving unit.
  • the second suction portion generates a negative pressure in the space above the uppermost surface of the ink in the ink receiving portion.
  • FIG. 1st conveyor belt of the 1st belt conveyor part of the inkjet recording apparatus of 1st Embodiment of this invention shows the schematic structure of the inkjet recording apparatus of embodiment of this invention. It is a top view which shows the structure around the recording part and the 1st belt transport part of the inkjet recording apparatus of FIG. It is a block diagram which shows the schematic structure of the inkjet recording apparatus of FIG. It is explanatory drawing which shows typically the structure along the paper transfer path from the paper supply part to the 2nd belt transfer part of FIG. It is a front view which shows the structure around the recording part and the 1st belt transport part of FIG. It is a top view of the 1st conveyor belt of the 1st belt conveyor part of the inkjet recording apparatus of 1st Embodiment of this invention.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of the inkjet recording apparatus 1 of the embodiment.
  • FIG. 2 is a plan view showing the configuration around the recording unit 5 and the first belt transport unit 41 of the inkjet recording apparatus 1 of FIG.
  • FIG. 3 is a block diagram showing a schematic configuration of the inkjet recording apparatus 1 of FIG.
  • the inkjet recording device 1 is, for example, an inkjet recording type printer.
  • the inkjet recording apparatus 1 includes an apparatus main body 2, a paper supply unit 3, a paper transport unit 4, a recording unit 5, a drying unit 6, and a control unit 7. , Equipped with.
  • the device main body 2 includes an operation unit 21.
  • the operation unit 21 is arranged in the upper part of the front surface of the apparatus main body 2, and sets recording conditions such as the type and size of the paper (recording medium) used for recording, enlargement / reduction, and the necessity of double-sided recording, and execution commands. Is directly accepted from the user himself. It should be noted that image data, recording conditions, execution commands, and the like may be received from an external computer via a network line or the like.
  • the paper supply unit 3 accommodates a plurality of sheets of paper S, and separates and sends out the paper S one by one at the time of recording.
  • the paper transport unit 4 conveys the paper S fed from the paper supply unit 3 to the recording unit 5 and the drying unit 6, and further discharges the paper S after recording and drying to the paper ejection unit 22.
  • the paper transport unit 4 distributes the paper S after recording and drying on the first side to the reverse transport unit 44 by the branch portion 43, and further switches the transport direction to reverse the front and back of the paper S. It is conveyed to the recording unit 5 and the drying unit 6 again.
  • the paper transport unit 4 has a first belt transport unit 41 and a second belt transport unit 42.
  • the first belt transport unit 41 and the second belt transport unit 42 adsorb and hold the paper S on the upper surface of the endless belt and transport the paper S.
  • the first belt transport unit 41 is arranged below the recording unit 5 to transport the paper S.
  • the second belt transport section 42 is arranged in the drying section 6 to transport the paper S.
  • the recording unit 5 faces the paper S that is adsorbed and held on the upper surface of the first belt transport unit 41 and is transported, and is arranged above the first belt transport unit 41 with a predetermined interval.
  • the recording unit 5 has a line-type inkjet recording head 51.
  • the recording head 51 includes recording heads 51B, 51C, 51M, and 51Y corresponding to each of the four colors of black, cyan, magenta, and yellow.
  • a plurality (for example, three) of the recording heads 51 of each color are arranged in a staggered manner along the paper width direction Dw orthogonal to the paper transport direction Dc.
  • the recording head 51 has a plurality of ink ejection nozzles 52 at the bottom thereof.
  • the plurality of ink ejection nozzles 52 are arranged side by side along the paper width direction Dw, and can eject ink over the entire recording area on the paper S. That is, the recording head 51 has a plurality of ink ejection nozzles 52 for ejecting ink on the paper S.
  • the recording unit 5 sequentially ejects ink from the four-color recording heads 51B, 51C, 51M, and 51Y toward the paper S conveyed by the first belt conveying unit 41, and records a full-color image or a monochrome image on the paper S. ..
  • the drying unit 6 is arranged on the downstream side of the recording unit 5 in the paper transport direction, and a second belt transport section 42 is provided.
  • the paper S on which the ink image is recorded in the recording unit 5 is sucked and held by the second belt transport unit 42 in the drying unit 6 to be conveyed, and the ink is dried.
  • the control unit 7 includes a CPU (not shown), other electronic circuits, and electronic components.
  • the CPU controls the operation of each component provided in the inkjet recording device 1 based on the control program and data stored in the storage unit 71, and performs processing related to the function of the inkjet recording device 1.
  • Each of the paper supply unit 3, the paper transport unit 4, the recording unit 5, and the drying unit 6 receives a command individually from the control unit 7 and records on the paper S in conjunction with each other.
  • control unit 7 performs flushing (empty ejection) to eject ink to the recording head 51 at a timing different from the ink ejection timing (during recording) for the paper S.
  • flushing clogging of the ink ejection nozzle 52 due to drying of the ink can be reduced and prevented.
  • the storage unit 71 is composed of a combination of a non-volatile storage device such as a program ROM (ReadOnlyMemory) and a data ROM (not shown) and a volatile storage device such as a RAM (RandomAccessMemory).
  • a non-volatile storage device such as a program ROM (ReadOnlyMemory) and a data ROM (not shown)
  • a volatile storage device such as a RAM (RandomAccessMemory).
  • FIG. 4 is an explanatory diagram schematically showing a configuration along a paper transport path from the paper supply section 3 to the second belt transport section 42 in FIG. 1.
  • the ink (water droplet shape) ejected from the recording head 51 is drawn on the lower side of the recording head 51 in FIG. 4, but the ink actually ejected is the ink drawn in FIG. Much smaller than (water drop shape).
  • FIG. 5 used in a later description.
  • the inkjet recording device 1 includes a resist roller pair 45, a resist sensor 46, a first paper sensor 47, and a second paper sensor 48.
  • the resist roller pair 45 is arranged on the downstream side of the paper feeding section 3 in the paper transport direction Dc.
  • the recording unit 5 and the first belt transport unit 41 are arranged in the immediate vicinity of the resist roller pair 45 on the downstream side of the paper transport direction Dc.
  • the paper S sent out from the paper supply unit 3 passes through the paper transport unit 4 and reaches the position of the resist roller pair 45.
  • the control unit 7 corrects the diagonal feed of the paper S by the resist roller pair 45, measures the timing with the ink ejection operation of the recording unit 5, and feeds the paper S toward the first belt transport unit 41.
  • the resist sensor 46 is arranged in the immediate vicinity of the upstream side of the paper transport direction Dc of the resist roller pair 45.
  • the resist sensor 46 detects the paper S that is sent out from the paper supply unit 3 and reaches the position of the resist roller pair 45.
  • the control unit 7 controls the rotation of the resist roller pair 45 based on the detection signal of the paper S received from the resist sensor 46.
  • the first paper sensor 47 is arranged on the downstream side of the resist roller pair 45 in the paper transport direction Dc and on the upstream side of the first belt transport unit 41 in the paper transport direction Dc.
  • the first paper sensor 47 is a line sensor that detects the position in the width direction of the paper S sent from the resist roller pair 45 to the first belt transport unit 41.
  • the control unit 7 Based on the detection signal of the paper S received from the first paper sensor 47, the control unit 7 ejects ink from the ink ejection nozzle 52 corresponding to the paper width among the plurality of ink ejection nozzles 52 of each of the recording heads 51 of each color. The operation can be controlled and the image can be recorded on the paper S.
  • the second paper sensor 48 is located on the downstream side of the paper transport direction Dc of the first paper sensor 47 and on the upstream side of the paper transport direction Dc of the recording unit 5 and above the first belt transport unit 41.
  • the second paper sensor 48 is a sensor that detects the position of the paper S transported by the first belt transport unit 41 in the transport direction.
  • the control unit 7 receives the ink ejection nozzle 52 for the paper S that has reached the position facing each of the recording heads 51 of each color by the first belt transport unit 41 based on the detection signal of the paper S received from the second paper sensor 48. Controls the ink ejection operation from.
  • the first belt transport unit 41 is arranged below the recording unit 5.
  • the first belt transport unit 41 attracts and holds the paper S on its upper surface, and transports the paper S along the paper transport direction Dc.
  • the first belt transport unit 41 includes a first transport belt (conveyor belt) 8, a roller 412, a first belt sensor 413, and a second belt sensor 414.
  • the first transport belt 8 is an endless belt and is erected by four rollers 412 arranged inside.
  • the roller 412 is arranged inside the first transport belt 8 and is rotatably supported around a rotation axis extending along the paper width direction Dw (see FIG. 2).
  • One of the four rollers 412 is a drive roller, and the first transfer belt 8 is rotated by the drive roller so that the upper surface moves in the paper transfer direction Dc.
  • the first transport belt 8 has a plurality of holes 81 penetrating the front and back surfaces and a plurality of openings 82 (openings group 83) (see FIG. 6). The first transport belt 8 transports the paper S to a position facing the recording head 51.
  • the first belt sensor 413 is located on the downstream side of the paper transport direction Dc of the recording unit 5 and above the first belt transport unit 41.
  • the second belt sensor 414 is inside the first conveyor belt 8 and is on the upstream side in the rotation direction of the first conveyor belt 8 of the roller 412 adjacent to the upstream end of the paper transport direction Dc on the upper surface of the first conveyor belt 8. Placed in.
  • the first belt sensor 413 and the second belt sensor 414 detect the position of the opening group 83 (see FIG. 6), which is a collection of a plurality of openings 82 provided in the first transport belt 8.
  • the first belt sensor 413 has the same function as the second paper sensor 48.
  • the second belt transport unit 42 is arranged in the drying unit 6.
  • the second belt transport unit 42 sucks and holds the paper S on its upper surface, and transports the paper S along the paper transport direction Dc.
  • the second belt transport unit 42 includes a second transport belt 421 and a roller 422.
  • the second transport belt 421 is an endless belt and is erected by two rollers 422 arranged inside.
  • the roller 422 is arranged inside the second transport belt 421 and is rotatably supported around a rotation axis extending along the paper width direction Dw (see FIG. 2).
  • One of the two rollers 422 is a drive roller, and the second transfer belt 421 is rotated by the drive roller so that the upper surface moves in the paper transfer direction Dc.
  • the drying unit 6 has a dryer 61.
  • the paper S on which the image is recorded by the recording unit 5 is dried by the dryer 61 during transportation by the second belt transport unit 42 in the drying unit 6, and is transported to the downstream side of the paper transport direction Dc of the drying unit 6.
  • FIG. 5 is a front view showing the configuration around the recording unit 5 and the first belt transport unit 41 of FIG.
  • FIG. 6 is a plan view of the first conveyor belt 8 of the first belt conveyor 41 of the inkjet recording apparatus 1 according to the first embodiment of the present invention.
  • the inkjet recording device 1 includes a paper suction unit 9, an ink receiving unit 10, and an ink discharging unit 11.
  • the paper suction unit 9 is arranged at an upper portion inside the first transport belt 8 and at a position facing one surface of the first transport belt 8 on the opposite side (lower side, back side) of the paper transport surface.
  • the paper suction unit 9 includes a housing 91 and an intake fan 92.
  • the housing 91 has a suction space 911 surrounded by side walls 91a on all sides inside the housing 91.
  • the suction space 911 In the suction space 911, the first transport belt 8 and the recording head 51 do not face each other on the upstream side and the downstream side of the paper transport direction Dc with respect to the facing section So where the first transport belt 8 and the recording head 51 face each other. It is arranged in the opposite section Sn.
  • the suction spaces 911 are provided at five locations from the lower side of the black recording head 51B on the upstream side of the paper transport direction Dc to the lower side of the yellow recording head 51Y on the downstream side of the paper transport direction Dc.
  • the housing 91 has a plurality of intake holes 912 above each of the five suction spaces 911. The plurality of intake holes 912 penetrate the housing 91 in the vertical direction.
  • the intake fan 92 is located inside the housing 91 and below the suction space 911.
  • the first transport belt 8 has a plurality of holes 81 and a plurality of openings 82.
  • the hole 81 and the opening 82 penetrate the front and back of the first transport belt 8.
  • the paper suction unit 9 sucks the air in the suction space 911 through the intake hole 912, the hole 81, and the opening 82 to suck the paper S into the paper transport surface of the first transport belt 8. Adhere to the top surface).
  • the plurality of holes 81 and the plurality of openings 82 attract the paper S to the upper surface of the first transport belt 8 which is the paper transport surface by sucking air by the paper suction portion 9.
  • the opening area of the opening 82 is larger than the opening area of the hole 81. Ink discharged from the recording head 51 passes through the opening 82 during flushing.
  • the opening 82 constitutes the opening group 83 by gathering a plurality of (for example, 10) openings 82.
  • the ink receiving portion 10 is arranged below the recording head 51 across the first transport belt 8. That is, the ink receiving portion 10 is arranged below the facing section So where the first transport belt 8 and the recording head 51 face each other.
  • a suction space 911 is adjacent to each of the upstream side and the downstream side of the paper transport direction Dc of the ink receiving portion 10.
  • the ink receiving portion 10 is composed of a rectangular parallelepiped box body having an open upper surface extending in the paper width direction Dw. The ink receiving portion 10 receives the ink that has passed through the opening 82 of the first transport belt 8 at the time of flushing.
  • the paper suction unit 9 further includes a communication unit 93.
  • the communication portion 93 is arranged between the side wall 91a of the suction space 911 and the ink receiving portion 10.
  • the communication portion 93 is connected to a portion of the side wall 91a of the suction space 911 above the intake fan 92 and a portion of the ink receiving portion 10 above the uppermost surface of the ink stored in the ink receiving portion 10.
  • the communication portion 93 is formed of, for example, a tubular shape extending in the paper transport direction Dc, and communicates the suction space 911 with the space inside the ink receiving portion 10.
  • the paper suction section 9 sucks the air in the suction space 911, and further sucks the air in the ink receiving section 10 via the communication section 93. That is, in the inkjet recording device 1, the first suction unit (paper suction unit 9) that attracts the paper S to the paper transport surface of the first transport belt 8 and the uppermost surface of the ink stored in the ink receiving unit 10 A second suction unit (paper suction unit 9) for sucking air from the space above is provided.
  • the second suction unit (paper suction unit 9) generates a negative pressure in the space above the uppermost surface of the ink in the ink receiving unit 10.
  • the ink droplets from diffusing around the ink receiving portion 10. That is, it is possible to prevent the periphery of the ink receiving portion 10, such as the first transport belt 8, from being contaminated by ink droplets.
  • the paper suction unit 9 which is the first suction unit also serves as the second suction unit by sucking the air in the ink receiving unit 10 through the communication unit 93.
  • the air in the ink receiving portion 10 can be sucked without separately providing a power source for sucking the air in the ink receiving portion 10 in addition to the intake fan 92. This makes it possible to reduce the number of parts, the number of assembly steps, and the power consumption.
  • the inkjet recording device 1 may be individually provided with a first suction unit and a second suction unit. According to this configuration, the suction force for sucking the paper S and the suction force for sucking the air in the ink receiving portion 10 can be individually and finely set.
  • the suction force in which the air in the ink receiving portion 10 is sucked through the communication portion 93 and the air is sucked through the hole portion 81 and the opening portion 82 by the paper suction portion 9 is
  • the non-opposing section Sn on the upstream side and the downstream side of the paper transport direction Dc is stronger than the facing section So where the recording head 51 and the ink receiving portion 10 face each other.
  • the suction force of air by the paper suction unit 9 can be weakened below the recording head 51 which is the facing section So, and the influence of the air flow on the ink droplets ejected from the ink ejection nozzle 52. It can be suppressed from reaching. This makes it possible to realize high-quality image recording.
  • the ink discharging unit 11 is arranged below the ink receiving unit 10.
  • the ink discharging unit 11 discharges the ink stored in the ink receiving unit 10.
  • a liquid feeding pump (not shown) is arranged on the downstream side of the ink discharging unit 11 in the ink discharging direction, and the ink stored in the ink receiving unit 10 is sucked out.
  • the ink discharge unit 11 has a check valve 111.
  • the check valve 111 includes, for example, a valve body and an urging member that urges the valve body to the upstream side in the ink discharge direction.
  • the check valve 111 prevents the ink discharged from the ink receiving portion 10 from flowing back to the ink receiving portion 10.
  • the ink discharged from the ink receiving portion 10 flows back to the ink receiving portion 10. Can be prevented. As a result, the ink in the ink receiving portion 10 can be efficiently discharged.
  • FIGS. 7, 8, 9, and 10 are plan views showing arrangement examples 1 to 4 of paper S on the first conveyor belt 8 of FIG.
  • the first transport belt 8 has a plurality of holes 81 and a plurality of openings 82.
  • a plurality of (for example, 10) openings 82 are assembled to form an opening group 83.
  • the first transport belt 8 has a plurality of opening groups 83 in one cycle Pe of the paper transport direction Dc, and has six in the present embodiment.
  • the opening group 83 includes the opening groups 83A, 83B, 83C, 83D, 83E, and 83F arranged in order from the downstream side of the paper transport direction Dc.
  • the holes 81 are arranged between the adjacent opening groups 83 in the paper transport direction Dc. The hole 81 is not arranged in the area where the opening group 83 is provided.
  • the openings group 83 are arranged at unequal intervals in one cycle Pe of the paper transport direction Dc of the first transport belt 8. That is, the distance between the adjacent opening groups 83 in the paper transport direction Dc is not constant.
  • the opening group 83 includes, for example, two opening rows 84.
  • the opening row 84 is configured by arranging a plurality of (for example, five) openings 82 at equal intervals along the paper width direction Dw.
  • the openings 82 of each of the two opening rows 84 are arranged so as to be offset from each other in the paper width direction Dw, and a part thereof overlaps with the paper transport direction Dc.
  • the ink ejected from all the ink ejection nozzles 52 of the recording head 51 passes through any opening 82 of the opening group 83.
  • the control unit 7 executes flushing (between paper flushing) between the paper S and the paper S which are sucked and held on the first transport belt 8 and conveyed. At the time of flushing, the control unit 7 determines the combination of the openings group 83 through which the ink is passed in one cycle Pe of the paper transport direction Dc of the first transport belt 8 according to the size of the paper S. The control unit 7 recognizes the size of the paper S based on information such as recording conditions received via the operation unit 21 and stored in the storage unit 71 or the like.
  • FIG. 7 shows an arrangement example 1 of the paper S when the size of the paper S is A4 size (horizontal placement) or letter size (horizontal placement).
  • the "horizontal placement” is a method of placing the paper S arranged so that the longitudinal direction of the rectangular paper S is along the paper width direction Dw.
  • the control unit 7 selects opening groups 83A, 83C, and 83F as the opening group 83 used for flushing.
  • FIG. 8 shows an arrangement example 2 of the paper S when the size of the paper S is A4 size (vertical placement) or letter size (vertical placement).
  • the "vertical placement” is a method of placing the paper S arranged so that the longitudinal direction of the rectangular paper S is along the paper transport direction Dc.
  • the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
  • FIG. 9 shows an arrangement example 3 of the paper S when the size of the paper S is A3 size (vertical placement), B4 size (vertical placement) or legal size (vertical placement).
  • the control unit 7 uses the opening group 83 as the opening group 83A, 83B, as the opening group 83 used for flushing. Select 83E.
  • FIG. 10 shows an arrangement example 4 of the paper S when the size of the paper S is 13 inches ⁇ 19.2 inches.
  • the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
  • the control unit 7 is a resist roller pair that feeds the paper S to the first conveyor belt 8 based on the detection signals of the opening group 83 received from the first belt sensor 413 and the second belt sensor 414 (both see FIG. 4).
  • the rotation of the 45 is controlled, and the ink ejection operation from the ink ejection nozzle 52 is further controlled.
  • the paper S is arranged on the first transport belt 8 while avoiding the regions of the opening groups 83A, 83B, 83C, 83D, 83E, and 83F selected as the opening group 83 used for flushing.
  • the flushing ink passes through the openings 82 of the opening groups 83A, 83B, 83C, 83D, 83E, and 83F selected as the opening group 83 used for flushing, and is stored in the ink receiving portion 10.
  • FIG. 11 is a plan view of the first conveyor belt 8 of the first belt conveyor 41 of the inkjet recording apparatus 1 of the second embodiment of the present invention.
  • 12 to 15 are plan views showing arrangement examples 1 to 4 of paper S on the first conveyor belt 8 of FIG.
  • the first transport belt 8 of the second embodiment has a plurality of openings 82.
  • the opening 82 is arranged over the entire area of the first transport belt 8.
  • the first transport belt 8 of the second embodiment does not have a configuration corresponding to the plurality of holes 81 seen in the first transport belt 8 of the first embodiment (see FIG. 6).
  • the opening 82 also serves as a hole for adsorbing the paper S on the first transport belt 8. That is, in the second embodiment, the hole portion of the first transport belt 8 for adsorbing the paper S has the same shape as the opening portion 82.
  • a plurality of (for example, five) openings 82 are juxtaposed at equal intervals along the paper width direction Dw to form an opening row 84.
  • the opening rows 84 are arranged at equal intervals along the paper transport direction Dc of the first transport belt 8.
  • the openings 82 of each of the opening rows 84 adjacent to the paper transport direction Dc are arranged so as to be offset from each other in the paper width direction Dw, and a part thereof overlaps with the paper transport direction Dc.
  • the opening group 83 is composed of two opening rows 84 adjacent to each other in the paper transport direction Dc. As shown in FIG. 11, the first transport belt 8 has a plurality of openings group 83 in one cycle Pe of the paper transport direction Dc.
  • the opening group 83 includes the opening groups 83A, 83B, 83C, 83D, 83E, and 83F arranged in order from the downstream side of the paper transport direction Dc (see FIGS. 12, 13, 14, and 15).
  • FIG. 12 shows an arrangement example 1 of the paper S when the size of the paper S is A4 size (horizontal placement) or letter size (horizontal placement).
  • the control unit 7 selects opening groups 83A, 83C, and 83F as the opening group 83 used for flushing.
  • FIG. 13 shows an arrangement example 2 of the paper S when the size of the paper S is A4 size (vertical placement) or letter size (vertical placement).
  • the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
  • FIG. 14 shows an arrangement example 3 of the paper S when the size of the paper S is A3 size (vertical placement), B4 size (vertical placement) or legal size (vertical placement).
  • the control unit 7 uses the opening group 83 as the opening group 83A, 83B, as the opening group 83 used for flushing. Select 83E.
  • FIG. 15 shows an arrangement example 4 of the paper S when the size of the paper S is 13 inches ⁇ 19.2 inches.
  • the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
  • any opening group 83 can be used as the opening group 83 used for flushing. You can choose. Therefore, flushing can be easily performed. Further, since the holes and openings 82 provided in the first transport belt 8 all have the same shape, the first transport belt 8 can be easily manufactured.
  • the present invention can be used in an inkjet recording device.
  • Inkjet recording device 5 Recording unit 7 Control unit 8 First transport belt (convey belt) 9 Paper suction part (1st suction part, 2nd suction part) 10 Ink receiving part 11 Ink discharging part 51 Recording head 52 Ink ejection nozzle 81 Hole part 82 Opening part 93 Communication part 111 Backflow prevention valve Dc Paper transport direction Dw Paper width direction S Paper (recording medium) Sn non-opposing section So facing section

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  • Ink Jet (AREA)

Abstract

Provided is an inkjet recording device capable of suppressing contamination of the periphery of an ink receiving part by spread of ink during flashing. The inkjet recording device is provided with a recording head 51, a first conveyance belt 8, a sheet sucking part 9, an ink receiving part 10, and a second sucking part (sheet sucking part 9). The sheet sucking part 9 adsorbs a sheet S on a sheet conveyance surface of the first conveyance belt 8 by sucking air via a hole part 81 and an opening part 82 of the first conveyance belt 8. The ink receiving part 10 is arranged below the recording head 51 across the first conveyance belt 8 and receives ink having passed through the opening part 82 during flashing to cause the recording head 51 to eject the ink at timing different from timing for ejecting the ink to the sheet S. The second sucking part (sheet sucking part 9) sucks air from space above an uppermost surface of the ink stored in the ink receiving part 10.

Description

インクジェット記録装置Inkjet recording device
　本発明は、インクジェット記録装置に関する。 The present invention relates to an inkjet recording device.
　インクジェット記録装置では、インクの乾燥によるノズルの目詰まりを低減及び予防するため、定期的にインクをノズルから吐き出すフラッシング（空吐出）が行われている。このようなインクジェット記録装置の一例が、特許文献１に開示されている。 In the inkjet recording device, flushing (empty ejection) is performed to periodically eject ink from the nozzle in order to reduce and prevent clogging of the nozzle due to drying of the ink. An example of such an inkjet recording device is disclosed in Patent Document 1.
　特許文献１で開示された従来のインクジェット記録装置は、記録媒体に対してインク滴を吐出する単位記録ヘッドと、記録媒体を単位記録ヘッドの下に搬送する搬送ベルトと、搬送ベルトを挟んで単位記録ヘッドと対向配置されたメンテナンス手段と、を備える。搬送ベルトには、単位記録ヘッドの配置に対応した複数の孔部が形成されている。メンテナンス手段は、単位記録ヘッドから吐出されたダミー印字のインク滴を収容するインク受け部材を備える。このインクジェット記録装置は、搬送ベルトの孔部が単位記録ヘッドと対向するときに、ダミー印字を行う。これにより、ダミー印字のインク滴を、搬送ベルトに付着させないように、搬送ベルトの孔部を通過させてインク受け部材に収容することができる。 The conventional inkjet recording apparatus disclosed in Patent Document 1 has a unit recording head that ejects ink droplets to a recording medium, a transfer belt that conveys the recording medium under the unit recording head, and a unit that sandwiches the transfer belt. It is provided with maintenance means arranged opposite to the recording head. The transport belt is formed with a plurality of holes corresponding to the arrangement of the unit recording heads. The maintenance means includes an ink receiving member for accommodating ink droplets of dummy printing ejected from the unit recording head. This inkjet recording device performs dummy printing when the hole of the conveyor belt faces the unit recording head. As a result, the ink droplets of the dummy print can be accommodated in the ink receiving member by passing through the holes of the transport belt so as not to adhere to the transport belt.
特開２００５－８１５９１号公報Japanese Unexamined Patent Publication No. 2005-81591
　しかしながら、従来技術では、ダミー印字のインク滴をインク受け部材で受けるときに、インクの飛沫が生じることがあった。そして、インクの飛沫によって、例えば搬送ベルト等の、インク受け部材の周辺が汚染されることに課題があった。 However, in the prior art, when the ink droplets of the dummy print are received by the ink receiving member, ink droplets may occur. Then, there is a problem that the periphery of the ink receiving member, such as a transport belt, is contaminated by the ink droplets.
　本発明は、上記の点に鑑みなされたものであり、記録媒体に対するインクの吐出タイミングとは異なるタイミングで、記録ヘッドにインクを吐出させるフラッシング時において、インク受け部周辺がインクの飛沫によって汚染されることを抑制することが可能なインクジェット記録装置を提供することを目的とする。 The present invention has been made in view of the above points, and the periphery of the ink receiving portion is contaminated by ink droplets during flushing in which ink is ejected to the recording head at a timing different from the ink ejection timing to the recording medium. It is an object of the present invention to provide an inkjet recording apparatus capable of suppressing such a problem.
　上記の課題を解決するため、本発明のインクジェット記録装置は、記録ヘッドと、搬送ベルトと、第１吸引部と、インク受け部と、第２吸引部と、を備える。記録ヘッドは、インクを吐出する複数のノズルを有する。搬送ベルトは、無端状であり、記録媒体を吸着させる複数の孔部、及び記録ヘッドから吐出されるインクが通過する複数の開口部を有して記録ヘッドと対向する位置に記録媒体を搬送する。第１吸引部は、搬送ベルトの記録媒体搬送面の反対側の一面に対向する吸引空間内の空気を孔部及び開口部を通して吸引することで記録媒体を搬送ベルトの記録媒体搬送面に吸着させる。インク受け部は、搬送ベルトを隔てて記録ヘッドの下方に配置され、記録媒体に対するインクの吐出タイミングとは異なるタイミングで、記録ヘッドにインクを吐出させるフラッシング時に、開口部を通過したインクを受ける。第２吸引部は、インク受け部内に貯留されるインクの最上面よりも上方の空間から空気を吸引する。 In order to solve the above problems, the inkjet recording apparatus of the present invention includes a recording head, a transport belt, a first suction unit, an ink receiving unit, and a second suction unit. The recording head has a plurality of nozzles for ejecting ink. The transport belt is endless and has a plurality of holes for adsorbing the recording medium and a plurality of openings through which the ink discharged from the recording head passes, and transports the recording medium to a position facing the recording head. .. The first suction unit sucks the air in the suction space facing the opposite surface of the recording medium transport surface of the transport belt through the holes and openings to attract the recording medium to the recording medium transport surface of the transport belt. .. The ink receiving portion is arranged below the recording head across a transport belt, and receives the ink that has passed through the opening at the time of flushing to eject the ink to the recording head at a timing different from the timing of ejecting the ink to the recording medium. The second suction unit sucks air from the space above the uppermost surface of the ink stored in the ink receiving unit.
　本発明の構成によれば、第２吸引部は、インク受け部内のインクの最上面よりも上方の空間において負圧を生じさせる。これにより、インクの飛沫がインク受け部周辺に拡散することを抑制することができる。すなわち、例えば搬送ベルト等の、インク受け部周辺がインクの飛沫によって汚染されることを抑制することが可能である。 According to the configuration of the present invention, the second suction portion generates a negative pressure in the space above the uppermost surface of the ink in the ink receiving portion. As a result, it is possible to prevent the ink droplets from diffusing around the ink receiving portion. That is, it is possible to prevent the periphery of the ink receiving portion, such as a transport belt, from being contaminated by ink droplets.
本発明の実施形態のインクジェット記録装置の概略構成を示す断面図である。It is sectional drawing which shows the schematic structure of the inkjet recording apparatus of embodiment of this invention. 図１のインクジェット記録装置の記録部及び第１ベルト搬送部周辺の構成を示す平面図である。It is a top view which shows the structure around the recording part and the 1st belt transport part of the inkjet recording apparatus of FIG. 図１のインクジェット記録装置の概略構成を示すブロック図である。It is a block diagram which shows the schematic structure of the inkjet recording apparatus of FIG. 図１の用紙供給部から第２ベルト搬送部までの用紙搬送経路に沿う構成を模式的に示す説明図である。It is explanatory drawing which shows typically the structure along the paper transfer path from the paper supply part to the 2nd belt transfer part of FIG. 図１の記録部及び第１ベルト搬送部周辺の構成を示す正面図である。It is a front view which shows the structure around the recording part and the 1st belt transport part of FIG. 本発明の第１実施形態のインクジェット記録装置の第１ベルト搬送部の第１搬送ベルトの平面図である。It is a top view of the 1st conveyor belt of the 1st belt conveyor part of the inkjet recording apparatus of 1st Embodiment of this invention. 図６の第１搬送ベルト上の用紙の配置例１を示す平面図である。It is a top view which shows the arrangement example 1 of the paper on the 1st conveyor belt of FIG. 図６の第１搬送ベルト上の用紙の配置例２を示す平面図である。It is a top view which shows the arrangement example 2 of the paper on the 1st conveyor belt of FIG. 図６の第１搬送ベルト上の用紙の配置例３を示す平面図である。It is a top view which shows the arrangement example 3 of the paper on the 1st conveyor belt of FIG. 図６の第１搬送ベルト上の用紙の配置例４を示す平面図である。It is a top view which shows the arrangement example 4 of the paper on the 1st conveyor belt of FIG. 本発明の第２実施形態のインクジェット記録装置の第１ベルト搬送部の第１搬送ベルトの平面図である。It is a top view of the 1st conveyor belt of the 1st belt conveyor part of the inkjet recording apparatus of 2nd Embodiment of this invention. 図１１の第１搬送ベルト上の用紙の配置例１を示す平面図である。It is a top view which shows the arrangement example 1 of the paper on the 1st conveyor belt of FIG. 図１１の第１搬送ベルト上の用紙の配置例２を示す平面図である。It is a top view which shows the arrangement example 2 of the paper on the 1st conveyor belt of FIG. 図１１の第１搬送ベルト上の用紙の配置例３を示す平面図である。It is a top view which shows the arrangement example 3 of the paper on the 1st conveyor belt of FIG. 図１１の第１搬送ベルト上の用紙の配置例４を示す平面図である。It is a top view which shows the arrangement example 4 of the paper on the 1st conveyor belt of FIG.
　以下、本発明の実施形態を図に基づき説明する。なお、本発明は以下の内容に限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following contents.
　図１は、実施形態のインクジェット記録装置１の概略構成を示す断面図である。図２は、図１のインクジェット記録装置１の記録部５及び第１ベルト搬送部４１周辺の構成を示す平面図である。図３は、図１のインクジェット記録装置１の概略構成を示すブロック図である。インクジェット記録装置１は、例えばインクジェット記録式のプリンターである。インクジェット記録装置１は、図１、図２及び図３に示すように、装置本体２と、用紙供給部３と、用紙搬送部４と、記録部５と、乾燥部６と、制御部７と、を備える。 FIG. 1 is a cross-sectional view showing a schematic configuration of the inkjet recording apparatus 1 of the embodiment. FIG. 2 is a plan view showing the configuration around the recording unit 5 and the first belt transport unit 41 of the inkjet recording apparatus 1 of FIG. FIG. 3 is a block diagram showing a schematic configuration of the inkjet recording apparatus 1 of FIG. The inkjet recording device 1 is, for example, an inkjet recording type printer. As shown in FIGS. 1, 2, and 3, the inkjet recording apparatus 1 includes an apparatus main body 2, a paper supply unit 3, a paper transport unit 4, a recording unit 5, a drying unit 6, and a control unit 7. , Equipped with.
　装置本体２は、操作部２１を備える。例えば、操作部２１は、装置本体２の正面上部に配置され、記録に使用する用紙（記録媒体）の種類やサイズ、拡大縮小、両面記録の要否といった記録条件などの設定、及び実行指令等を、ユーザー自身から直接受け付ける。なお、画像データ、記録条件、及び実行指令等を、外部のコンピュータからネットワーク回線等を介して受け付けることにしても良い。 The device main body 2 includes an operation unit 21. For example, the operation unit 21 is arranged in the upper part of the front surface of the apparatus main body 2, and sets recording conditions such as the type and size of the paper (recording medium) used for recording, enlargement / reduction, and the necessity of double-sided recording, and execution commands. Is directly accepted from the user himself. It should be noted that image data, recording conditions, execution commands, and the like may be received from an external computer via a network line or the like.
　用紙供給部３は、複数枚の用紙Ｓを収容し、記録時に用紙Ｓを１枚ずつ分離して送り出す。用紙搬送部４は、用紙供給部３から送り出された用紙Ｓを記録部５及び乾燥部６へと搬送し、さらに記録、乾燥後の用紙Ｓを用紙排出部２２に排出する。両面記録が行われる場合、用紙搬送部４は、第１面の記録、乾燥後の用紙Ｓを分岐部４３によって反転搬送部４４に振り分け、さらに搬送方向を切り替えて表裏を反転させた用紙Ｓを再度、記録部５及び乾燥部６へと搬送する。 The paper supply unit 3 accommodates a plurality of sheets of paper S, and separates and sends out the paper S one by one at the time of recording. The paper transport unit 4 conveys the paper S fed from the paper supply unit 3 to the recording unit 5 and the drying unit 6, and further discharges the paper S after recording and drying to the paper ejection unit 22. When double-sided recording is performed, the paper transport unit 4 distributes the paper S after recording and drying on the first side to the reverse transport unit 44 by the branch portion 43, and further switches the transport direction to reverse the front and back of the paper S. It is conveyed to the recording unit 5 and the drying unit 6 again.
　用紙搬送部４は、第１ベルト搬送部４１及び第２ベルト搬送部４２を有する。第１ベルト搬送部４１及び第２ベルト搬送部４２は、無端状のベルトの上面に用紙Ｓを吸着保持して搬送する。第１ベルト搬送部４１は、記録部５の下方に配置されて用紙Ｓを搬送する。第２ベルト搬送部４２は、乾燥部６に配置されて用紙Ｓを搬送する。 The paper transport unit 4 has a first belt transport unit 41 and a second belt transport unit 42. The first belt transport unit 41 and the second belt transport unit 42 adsorb and hold the paper S on the upper surface of the endless belt and transport the paper S. The first belt transport unit 41 is arranged below the recording unit 5 to transport the paper S. The second belt transport section 42 is arranged in the drying section 6 to transport the paper S.
　記録部５は、第１ベルト搬送部４１の上面に吸着保持されて搬送される用紙Ｓに対向し、所定の間隔を設けて第１ベルト搬送部４１の上方に配置される。記録部５は、ライン型インクジェット方式の記録ヘッド５１を有する。記録ヘッド５１は、図２に示すように、ブラック、シアン、マゼンタ、イエローの４色それぞれに対応した記録ヘッド５１Ｂ、５１Ｃ、５１Ｍ、５１Ｙを含む。各色の記録ヘッド５１のそれぞれは、用紙搬送方向Ｄｃと直交する用紙幅方向Ｄｗに沿って複数（例えば３つ）が千鳥状に配列される。 The recording unit 5 faces the paper S that is adsorbed and held on the upper surface of the first belt transport unit 41 and is transported, and is arranged above the first belt transport unit 41 with a predetermined interval. The recording unit 5 has a line-type inkjet recording head 51. As shown in FIG. 2, the recording head 51 includes recording heads 51B, 51C, 51M, and 51Y corresponding to each of the four colors of black, cyan, magenta, and yellow. A plurality (for example, three) of the recording heads 51 of each color are arranged in a staggered manner along the paper width direction Dw orthogonal to the paper transport direction Dc.
　記録ヘッド５１は、その底部に複数のインク吐出ノズル５２を有する。複数のインク吐出ノズル５２は、用紙幅方向Ｄｗに沿って並べて配置され、用紙Ｓ上の記録領域の全域にわたってインクを吐出することができる。すなわち、記録ヘッド５１は、用紙Ｓ上にインクを吐出する複数のインク吐出ノズル５２を有する。記録部５は、第１ベルト搬送部４１によって搬送される用紙Ｓに向かって４色の記録ヘッド５１Ｂ、５１Ｃ、５１Ｍ、５１Ｙから順次インクを吐出し、フルカラー画像またはモノクロ画像を用紙Ｓに記録する。 The recording head 51 has a plurality of ink ejection nozzles 52 at the bottom thereof. The plurality of ink ejection nozzles 52 are arranged side by side along the paper width direction Dw, and can eject ink over the entire recording area on the paper S. That is, the recording head 51 has a plurality of ink ejection nozzles 52 for ejecting ink on the paper S. The recording unit 5 sequentially ejects ink from the four- color recording heads 51B, 51C, 51M, and 51Y toward the paper S conveyed by the first belt conveying unit 41, and records a full-color image or a monochrome image on the paper S. ..
　乾燥部６は、記録部５の用紙搬送方向の下流側に配置され、第２ベルト搬送部４２が設けられる。記録部５でインク画像が記録された用紙Ｓは、乾燥部６において第２ベルト搬送部４２に吸着保持されて搬送される間に、インクが乾燥される。 The drying unit 6 is arranged on the downstream side of the recording unit 5 in the paper transport direction, and a second belt transport section 42 is provided. The paper S on which the ink image is recorded in the recording unit 5 is sucked and held by the second belt transport unit 42 in the drying unit 6 to be conveyed, and the ink is dried.
　制御部７は、不図示のＣＰＵ、その他の電子回路及び電子部品を含む。ＣＰＵは、記憶部７１に記憶された制御用のプログラムやデータに基づき、インクジェット記録装置１に設けられた各構成要素の動作を制御してインクジェット記録装置１の機能に係る処理を行う。用紙供給部３、用紙搬送部４、記録部５及び乾燥部６それぞれは、制御部７から個別に指令を受け、連動して用紙Ｓへの記録を行う。 The control unit 7 includes a CPU (not shown), other electronic circuits, and electronic components. The CPU controls the operation of each component provided in the inkjet recording device 1 based on the control program and data stored in the storage unit 71, and performs processing related to the function of the inkjet recording device 1. Each of the paper supply unit 3, the paper transport unit 4, the recording unit 5, and the drying unit 6 receives a command individually from the control unit 7 and records on the paper S in conjunction with each other.
　また、制御部７は、用紙Ｓに対するインクの吐出タイミング（記録時）とは異なるタイミングで、記録ヘッド５１にインクを吐出させるフラッシング（空吐出）を行う。フラッシングを行うことで、インクの乾燥によるインク吐出ノズル５２の目詰まりを低減及び予防することができる。 Further, the control unit 7 performs flushing (empty ejection) to eject ink to the recording head 51 at a timing different from the ink ejection timing (during recording) for the paper S. By flushing, clogging of the ink ejection nozzle 52 due to drying of the ink can be reduced and prevented.
　記憶部７１は、例えば不図示のプログラムＲＯＭ（Read Only Memory）、データＲＯＭなどといった不揮発性の記憶装置と、ＲＡＭ（Random Access Memory）のような揮発性の記憶装置との組み合わせで構成される。 The storage unit 71 is composed of a combination of a non-volatile storage device such as a program ROM (ReadOnlyMemory) and a data ROM (not shown) and a volatile storage device such as a RAM (RandomAccessMemory).
　図４は、図１の用紙供給部３から第２ベルト搬送部４２までの用紙搬送経路に沿う構成を模式的に示す説明図である。なお、説明の便宜上、図４の記録ヘッド５１の下側には、記録ヘッド５１から吐出されたインク（水滴形状）を描画したが、実際に吐出されたインクは、図４に描画されたインク（水滴形状）よりも遥かに小さい。後の説明で用いる図５も同様である。 FIG. 4 is an explanatory diagram schematically showing a configuration along a paper transport path from the paper supply section 3 to the second belt transport section 42 in FIG. 1. For convenience of explanation, the ink (water droplet shape) ejected from the recording head 51 is drawn on the lower side of the recording head 51 in FIG. 4, but the ink actually ejected is the ink drawn in FIG. Much smaller than (water drop shape). The same applies to FIG. 5 used in a later description.
　インクジェット記録装置１は、図４に示すように、レジストローラー対４５と、レジストセンサー４６と、第１用紙センサー４７と、第２用紙センサー４８と、を備える。 As shown in FIG. 4, the inkjet recording device 1 includes a resist roller pair 45, a resist sensor 46, a first paper sensor 47, and a second paper sensor 48.
　レジストローラー対４５は、用紙供給部３の用紙搬送方向Ｄｃの下流側に配置される。レジストローラー対４５の用紙搬送方向Ｄｃの下流側の直近には、記録部５及び第１ベルト搬送部４１が配置される。用紙供給部３から送り出された用紙Ｓは、用紙搬送部４を通ってレジストローラー対４５の箇所に到達する。制御部７は、レジストローラー対４５によって、用紙Ｓの斜め送りを矯正するとともに、記録部５のインク吐出動作とのタイミングを計り、第１ベルト搬送部４１に向かって用紙Ｓを送り出す。 The resist roller pair 45 is arranged on the downstream side of the paper feeding section 3 in the paper transport direction Dc. The recording unit 5 and the first belt transport unit 41 are arranged in the immediate vicinity of the resist roller pair 45 on the downstream side of the paper transport direction Dc. The paper S sent out from the paper supply unit 3 passes through the paper transport unit 4 and reaches the position of the resist roller pair 45. The control unit 7 corrects the diagonal feed of the paper S by the resist roller pair 45, measures the timing with the ink ejection operation of the recording unit 5, and feeds the paper S toward the first belt transport unit 41.
　レジストセンサー４６は、レジストローラー対４５の用紙搬送方向Ｄｃの上流側の直近に配置される。レジストセンサー４６は、用紙供給部３から送り出され、レジストローラー対４５の箇所に到達する用紙Ｓを検知する。制御部７は、レジストセンサー４６から受信した用紙Ｓの検知信号に基づき、レジストローラー対４５の回転を制御する。 The resist sensor 46 is arranged in the immediate vicinity of the upstream side of the paper transport direction Dc of the resist roller pair 45. The resist sensor 46 detects the paper S that is sent out from the paper supply unit 3 and reaches the position of the resist roller pair 45. The control unit 7 controls the rotation of the resist roller pair 45 based on the detection signal of the paper S received from the resist sensor 46.
　第１用紙センサー４７は、レジストローラー対４５の用紙搬送方向Ｄｃの下流側、且つ第１ベルト搬送部４１の用紙搬送方向Ｄｃの上流側に配置される。第１用紙センサー４７は、レジストローラー対４５から第１ベルト搬送部４１に送られる用紙Ｓの幅方向の位置を検知するラインセンサーである。制御部７は、第１用紙センサー４７から受信した用紙Ｓの検知信号に基づき、各色の記録ヘッド５１それぞれの複数のインク吐出ノズル５２のうち、用紙幅に対応するインク吐出ノズル５２からのインク吐出動作を制御し、用紙Ｓに画像を記録することができる。 The first paper sensor 47 is arranged on the downstream side of the resist roller pair 45 in the paper transport direction Dc and on the upstream side of the first belt transport unit 41 in the paper transport direction Dc. The first paper sensor 47 is a line sensor that detects the position in the width direction of the paper S sent from the resist roller pair 45 to the first belt transport unit 41. Based on the detection signal of the paper S received from the first paper sensor 47, the control unit 7 ejects ink from the ink ejection nozzle 52 corresponding to the paper width among the plurality of ink ejection nozzles 52 of each of the recording heads 51 of each color. The operation can be controlled and the image can be recorded on the paper S.
　第２用紙センサー４８は、第１用紙センサー４７の用紙搬送方向Ｄｃの下流側、且つ記録部５の用紙搬送方向Ｄｃの上流側であって、第１ベルト搬送部４１の上方に配置される。第２用紙センサー４８は、第１ベルト搬送部４１によって搬送される用紙Ｓの搬送方向の位置を検知するセンサーである。制御部７は、第２用紙センサー４８から受信した用紙Ｓの検知信号に基づき、第１ベルト搬送部４１によって各色の記録ヘッド５１それぞれと対向する位置に到達した用紙Ｓに対し、インク吐出ノズル５２からのインク吐出動作を制御する。 The second paper sensor 48 is located on the downstream side of the paper transport direction Dc of the first paper sensor 47 and on the upstream side of the paper transport direction Dc of the recording unit 5 and above the first belt transport unit 41. The second paper sensor 48 is a sensor that detects the position of the paper S transported by the first belt transport unit 41 in the transport direction. The control unit 7 receives the ink ejection nozzle 52 for the paper S that has reached the position facing each of the recording heads 51 of each color by the first belt transport unit 41 based on the detection signal of the paper S received from the second paper sensor 48. Controls the ink ejection operation from.
　第１ベルト搬送部４１は、記録部５の下方に配置される。第１ベルト搬送部４１は、その上面に用紙Ｓを吸着保持し、当該用紙Ｓを用紙搬送方向Ｄｃに沿って搬送する。第１ベルト搬送部４１は、第１搬送ベルト（搬送ベルト）８と、ローラー４１２と、第１ベルトセンサー４１３と、第２ベルトセンサー４１４と、を含む。 The first belt transport unit 41 is arranged below the recording unit 5. The first belt transport unit 41 attracts and holds the paper S on its upper surface, and transports the paper S along the paper transport direction Dc. The first belt transport unit 41 includes a first transport belt (conveyor belt) 8, a roller 412, a first belt sensor 413, and a second belt sensor 414.
　第１搬送ベルト８は、無端状のベルトであって、内側に配置された４本のローラー４１２によって架設される。ローラー４１２は、第１搬送ベルト８の内側に配置され、用紙幅方向Ｄｗ（図２参照）に沿って延びる回転軸線を中心として回転可能に支持される。４本のローラー４１２のうち１本が駆動ローラーであり、第１搬送ベルト８は、当該駆動ローラーによって、上面が用紙搬送方向Ｄｃに移動するように回転される。第１搬送ベルト８は、表裏を貫通する複数の孔部８１及び複数の開口部８２（開口部群８３）を有する（図６参照）。第１搬送ベルト８は、記録ヘッド５１と対向する位置に用紙Ｓを搬送する。 The first transport belt 8 is an endless belt and is erected by four rollers 412 arranged inside. The roller 412 is arranged inside the first transport belt 8 and is rotatably supported around a rotation axis extending along the paper width direction Dw (see FIG. 2). One of the four rollers 412 is a drive roller, and the first transfer belt 8 is rotated by the drive roller so that the upper surface moves in the paper transfer direction Dc. The first transport belt 8 has a plurality of holes 81 penetrating the front and back surfaces and a plurality of openings 82 (openings group 83) (see FIG. 6). The first transport belt 8 transports the paper S to a position facing the recording head 51.
　第１ベルトセンサー４１３は、記録部５の用紙搬送方向Ｄｃの下流側であって、第１ベルト搬送部４１の上方に配置される。第２ベルトセンサー４１４は、第１搬送ベルト８の内側であって、第１搬送ベルト８の上面の用紙搬送方向Ｄｃの上流端部に隣接するローラー４１２の第１搬送ベルト８の回転方向上流側に配置される。第１ベルトセンサー４１３及び第２ベルトセンサー４１４は、第１搬送ベルト８に設けられた複数の開口部８２の集合である開口部群８３（図６参照）の位置を検知する。なお、第１ベルトセンサー４１３は、第２用紙センサー４８と同等の機能を兼ね備える。 The first belt sensor 413 is located on the downstream side of the paper transport direction Dc of the recording unit 5 and above the first belt transport unit 41. The second belt sensor 414 is inside the first conveyor belt 8 and is on the upstream side in the rotation direction of the first conveyor belt 8 of the roller 412 adjacent to the upstream end of the paper transport direction Dc on the upper surface of the first conveyor belt 8. Placed in. The first belt sensor 413 and the second belt sensor 414 detect the position of the opening group 83 (see FIG. 6), which is a collection of a plurality of openings 82 provided in the first transport belt 8. The first belt sensor 413 has the same function as the second paper sensor 48.
　第２ベルト搬送部４２は、乾燥部６に配置される。第２ベルト搬送部４２は、その上面に用紙Ｓを吸着保持し、当該用紙Ｓを用紙搬送方向Ｄｃに沿って搬送する。第２ベルト搬送部４２は、第２搬送ベルト４２１と、ローラー４２２と、を含む。 The second belt transport unit 42 is arranged in the drying unit 6. The second belt transport unit 42 sucks and holds the paper S on its upper surface, and transports the paper S along the paper transport direction Dc. The second belt transport unit 42 includes a second transport belt 421 and a roller 422.
　第２搬送ベルト４２１は、無端状のベルトであって、内側に配置された２本のローラー４２２によって架設される。ローラー４２２は、第２搬送ベルト４２１の内側に配置され、用紙幅方向Ｄｗ（図２参照）に沿って延びる回転軸線を中心として回転可能に支持される。２本のローラー４２２のうち１本が駆動ローラーであり、第２搬送ベルト４２１は、当該駆動ローラーによって、上面が用紙搬送方向Ｄｃに移動するように回転される。 The second transport belt 421 is an endless belt and is erected by two rollers 422 arranged inside. The roller 422 is arranged inside the second transport belt 421 and is rotatably supported around a rotation axis extending along the paper width direction Dw (see FIG. 2). One of the two rollers 422 is a drive roller, and the second transfer belt 421 is rotated by the drive roller so that the upper surface moves in the paper transfer direction Dc.
　乾燥部６は、乾燥器６１を有する。記録部５によって画像が記録された用紙Ｓは、乾燥部６において、第２ベルト搬送部４２による搬送中に乾燥器６１によって乾燥され、乾燥部６の用紙搬送方向Ｄｃの下流側へと搬送される。 The drying unit 6 has a dryer 61. The paper S on which the image is recorded by the recording unit 5 is dried by the dryer 61 during transportation by the second belt transport unit 42 in the drying unit 6, and is transported to the downstream side of the paper transport direction Dc of the drying unit 6. To.
　図５は、図１の記録部５及び第１ベルト搬送部４１周辺の構成を示す正面図である。図６は、本発明の第１実施形態のインクジェット記録装置１の第１ベルト搬送部４１の第１搬送ベルト８の平面図である。インクジェット記録装置１は、図５に示すように、用紙吸引部９と、インク受け部１０と、インク排出部１１と、を備える。 FIG. 5 is a front view showing the configuration around the recording unit 5 and the first belt transport unit 41 of FIG. FIG. 6 is a plan view of the first conveyor belt 8 of the first belt conveyor 41 of the inkjet recording apparatus 1 according to the first embodiment of the present invention. As shown in FIG. 5, the inkjet recording device 1 includes a paper suction unit 9, an ink receiving unit 10, and an ink discharging unit 11.
　用紙吸引部９は、第１搬送ベルト８の内側の上部であって、第１搬送ベルト８の用紙搬送面の反対側（下側、裏側）の一面に対向する箇所に配置される。用紙吸引部９は、ハウジング９１と、吸気ファン９２と、を備える。 The paper suction unit 9 is arranged at an upper portion inside the first transport belt 8 and at a position facing one surface of the first transport belt 8 on the opposite side (lower side, back side) of the paper transport surface. The paper suction unit 9 includes a housing 91 and an intake fan 92.
　ハウジング９１は、その内部に、四方を側壁９１ａに囲まれた吸引空間９１１を有する。吸引空間９１１は、第１搬送ベルト８と記録ヘッド５１とが対向する対向区間Ｓｏに対して用紙搬送方向Ｄｃの上流側及び下流側の、第１搬送ベルト８と記録ヘッド５１とが対向しない非対向区間Ｓｎに配置される。吸引空間９１１は、ブラックの記録ヘッド５１Ｂの用紙搬送方向Ｄｃの上流側の下方からイエローの記録ヘッド５１Ｙの用紙搬送方向Ｄｃの下流側の下方まで、５箇所に設けられる。ハウジング９１は、５つの吸引空間９１１それぞれの上方に複数の吸気孔９１２を有する。複数の吸気孔９１２は、ハウジング９１を上下方向に貫通する。 The housing 91 has a suction space 911 surrounded by side walls 91a on all sides inside the housing 91. In the suction space 911, the first transport belt 8 and the recording head 51 do not face each other on the upstream side and the downstream side of the paper transport direction Dc with respect to the facing section So where the first transport belt 8 and the recording head 51 face each other. It is arranged in the opposite section Sn. The suction spaces 911 are provided at five locations from the lower side of the black recording head 51B on the upstream side of the paper transport direction Dc to the lower side of the yellow recording head 51Y on the downstream side of the paper transport direction Dc. The housing 91 has a plurality of intake holes 912 above each of the five suction spaces 911. The plurality of intake holes 912 penetrate the housing 91 in the vertical direction.
　吸気ファン９２は、ハウジング９１の内部であって、吸引空間９１１の下方に配置される。なお、第１搬送ベルト８は、図６に示すように、複数の孔部８１と、複数の開口部８２と、を有する。孔部８１及び開口部８２は、第１搬送ベルト８の表裏を貫通する。吸気ファン９２を駆動させると、用紙吸引部９は、吸引空間９１１内の空気を吸気孔９１２、孔部８１及び開口部８２を通して吸引することで用紙Ｓを第１搬送ベルト８の用紙搬送面（上面）に吸着させる。 The intake fan 92 is located inside the housing 91 and below the suction space 911. As shown in FIG. 6, the first transport belt 8 has a plurality of holes 81 and a plurality of openings 82. The hole 81 and the opening 82 penetrate the front and back of the first transport belt 8. When the intake fan 92 is driven, the paper suction unit 9 sucks the air in the suction space 911 through the intake hole 912, the hole 81, and the opening 82 to suck the paper S into the paper transport surface of the first transport belt 8. Adhere to the top surface).
　複数の孔部８１及び複数の開口部８２は、用紙吸引部９によって空気が吸引されることで、第１搬送ベルト８の用紙搬送面である上面に用紙Ｓを吸着させる。開口部８２の開口面積は、孔部８１の開口面積よりも大きい。開口部８２は、フラッシング時に、記録ヘッド５１から吐出されるインクが通過する。開口部８２は、複数（例えば１０個）が集合することで開口部群８３を構成している。 The plurality of holes 81 and the plurality of openings 82 attract the paper S to the upper surface of the first transport belt 8 which is the paper transport surface by sucking air by the paper suction portion 9. The opening area of the opening 82 is larger than the opening area of the hole 81. Ink discharged from the recording head 51 passes through the opening 82 during flushing. The opening 82 constitutes the opening group 83 by gathering a plurality of (for example, 10) openings 82.
　インク受け部１０は、第１搬送ベルト８を隔てて記録ヘッド５１の下方に配置される。すなわち、インク受け部１０は、第１搬送ベルト８と記録ヘッド５１とが対向する対向区間Ｓｏの下方に配置される。インク受け部１０の、用紙搬送方向Ｄｃの上流側及び下流側のそれぞれには、吸引空間９１１が隣接している。インク受け部１０は、上面が開口した用紙幅方向Ｄｗに延びる直方体形状の箱体で構成される。インク受け部１０は、フラッシング時に、第１搬送ベルト８の開口部８２を通過したインクを受ける。 The ink receiving portion 10 is arranged below the recording head 51 across the first transport belt 8. That is, the ink receiving portion 10 is arranged below the facing section So where the first transport belt 8 and the recording head 51 face each other. A suction space 911 is adjacent to each of the upstream side and the downstream side of the paper transport direction Dc of the ink receiving portion 10. The ink receiving portion 10 is composed of a rectangular parallelepiped box body having an open upper surface extending in the paper width direction Dw. The ink receiving portion 10 receives the ink that has passed through the opening 82 of the first transport belt 8 at the time of flushing.
　用紙吸引部９は、さらに連通部９３を備える。連通部９３は、吸引空間９１１の側壁９１ａと、インク受け部１０との間に配置される。連通部９３は、吸引空間９１１の側壁９１ａの吸気ファン９２よりも上方の部分と、インク受け部１０の、インク受け部１０内に貯留されるインクの最上面よりも上方の部分とに接続される。連通部９３は、例えば用紙搬送方向Ｄｃに延びる管状で構成され、吸引空間９１１と、インク受け部１０内の空間とを連通させる。 The paper suction unit 9 further includes a communication unit 93. The communication portion 93 is arranged between the side wall 91a of the suction space 911 and the ink receiving portion 10. The communication portion 93 is connected to a portion of the side wall 91a of the suction space 911 above the intake fan 92 and a portion of the ink receiving portion 10 above the uppermost surface of the ink stored in the ink receiving portion 10. Ink. The communication portion 93 is formed of, for example, a tubular shape extending in the paper transport direction Dc, and communicates the suction space 911 with the space inside the ink receiving portion 10.
　吸気ファン９２を駆動させると、用紙吸引部９は、吸引空間９１１内の空気を吸引し、さらに連通部９３を介してインク受け部１０内の空気を吸引する。すなわち、インクジェット記録装置１は、用紙Ｓを第１搬送ベルト８の用紙搬送面に吸着させる第１吸引部（用紙吸引部９）と、インク受け部１０内に貯留されるインクの最上面よりも上方の空間から空気を吸引する第２吸引部（用紙吸引部９）と、備える。 When the intake fan 92 is driven, the paper suction section 9 sucks the air in the suction space 911, and further sucks the air in the ink receiving section 10 via the communication section 93. That is, in the inkjet recording device 1, the first suction unit (paper suction unit 9) that attracts the paper S to the paper transport surface of the first transport belt 8 and the uppermost surface of the ink stored in the ink receiving unit 10 A second suction unit (paper suction unit 9) for sucking air from the space above is provided.
　上記の構成によれば、第２吸引部（用紙吸引部９）は、インク受け部１０内のインクの最上面よりも上方の空間において負圧を生じさせる。これにより、インクの飛沫がインク受け部１０周辺に拡散することを抑制することができる。すなわち、例えば第１搬送ベルト８等の、インク受け部１０周辺がインクの飛沫によって汚染されることを抑制することが可能である。 According to the above configuration, the second suction unit (paper suction unit 9) generates a negative pressure in the space above the uppermost surface of the ink in the ink receiving unit 10. As a result, it is possible to prevent the ink droplets from diffusing around the ink receiving portion 10. That is, it is possible to prevent the periphery of the ink receiving portion 10, such as the first transport belt 8, from being contaminated by ink droplets.
　また、上記の構成のように、第１吸引部である用紙吸引部９は、連通部９３を介してインク受け部１０内の空気を吸引することで第２吸引部を兼ねている。この構成によれば、吸気ファン９２に加えて別途インク受け部１０内の空気を吸引するための動力源を設けることなく、インク受け部１０内の空気を吸引することができる。これにより、部品点数の低減と、組み立て工数の低減と、低消費電力化とを図ることが可能である。 Further, as in the above configuration, the paper suction unit 9 which is the first suction unit also serves as the second suction unit by sucking the air in the ink receiving unit 10 through the communication unit 93. According to this configuration, the air in the ink receiving portion 10 can be sucked without separately providing a power source for sucking the air in the ink receiving portion 10 in addition to the intake fan 92. This makes it possible to reduce the number of parts, the number of assembly steps, and the power consumption.
　なお、インクジェット記録装置１は、第１吸引部と、第２吸引部とを個別に備えることにしても良い。この構成によれば、用紙Ｓを吸引するための吸引力と、インク受け部１０内の空気を吸引するための吸引力とを個別に細かく設定することが可能になる。 The inkjet recording device 1 may be individually provided with a first suction unit and a second suction unit. According to this configuration, the suction force for sucking the paper S and the suction force for sucking the air in the ink receiving portion 10 can be individually and finely set.
　また、インク受け部１０内の空気が連通部９３を介して吸引され、用紙吸引部９（第１吸引部及び第２吸引部）により孔部８１及び開口部８２を通して空気を吸引する吸引力は、記録ヘッド５１とインク受け部１０とが対向する対向区間Ｓｏよりも、対向区間Ｓｏに対して用紙搬送方向Ｄｃの上流側及び下流側の非対向区間Ｓｎのほうが強い。 Further, the suction force in which the air in the ink receiving portion 10 is sucked through the communication portion 93 and the air is sucked through the hole portion 81 and the opening portion 82 by the paper suction portion 9 (the first suction portion and the second suction portion) is The non-opposing section Sn on the upstream side and the downstream side of the paper transport direction Dc is stronger than the facing section So where the recording head 51 and the ink receiving portion 10 face each other.
　上記の構成によれば、対向区間Ｓｏである記録ヘッド５１の下方において、用紙吸引部９による空気の吸引力を弱くすることができ、インク吐出ノズル５２から吐出されたインク滴に気流の影響が及ぶことを抑制することができる。これにより、高品質な画像の記録を実現することが可能である。 According to the above configuration, the suction force of air by the paper suction unit 9 can be weakened below the recording head 51 which is the facing section So, and the influence of the air flow on the ink droplets ejected from the ink ejection nozzle 52. It can be suppressed from reaching. This makes it possible to realize high-quality image recording.
　インク排出部１１は、インク受け部１０の下方に配置される。インク排出部１１は、インク受け部１０内に貯留されるインクを排出する。インク排出部１１のインク排出方向の下流側には、例えば送液ポンプ（不図示）が配置され、インク受け部１０内に貯留されるインクが吸い出される。 The ink discharging unit 11 is arranged below the ink receiving unit 10. The ink discharging unit 11 discharges the ink stored in the ink receiving unit 10. For example, a liquid feeding pump (not shown) is arranged on the downstream side of the ink discharging unit 11 in the ink discharging direction, and the ink stored in the ink receiving unit 10 is sucked out.
　インク排出部１１は、逆流防止弁１１１を有する。逆流防止弁１１１は、例えば弁体と、弁体をインク排出方向の上流側に付勢する付勢部材とを備える。逆流防止弁１１１は、インク受け部１０から排出されたインクがインク受け部１０に逆流することを防止する。 The ink discharge unit 11 has a check valve 111. The check valve 111 includes, for example, a valve body and an urging member that urges the valve body to the upstream side in the ink discharge direction. The check valve 111 prevents the ink discharged from the ink receiving portion 10 from flowing back to the ink receiving portion 10.
　上記の構成によれば、インク受け部１０内のインクの最上面よりも上方の空間において負圧が生じた場合に、インク受け部１０から排出されたインクがインク受け部１０に逆流することを防止することができる。これにより、インク受け部１０内のインクを、効率良く排出すことが可能である。 According to the above configuration, when a negative pressure is generated in the space above the uppermost surface of the ink in the ink receiving portion 10, the ink discharged from the ink receiving portion 10 flows back to the ink receiving portion 10. Can be prevented. As a result, the ink in the ink receiving portion 10 can be efficiently discharged.
　続いて、第１実施形態の第１搬送ベルト８の詳細な構成について、図６に加えて図７、図８、図９及び図１０を用いて説明する。図７～図１０は、図６の第１搬送ベルト８上の用紙Ｓの配置例１～配置例４を示す平面図である。 Subsequently, the detailed configuration of the first transport belt 8 of the first embodiment will be described with reference to FIGS. 7, 8, 9, and 10 in addition to FIG. 7 to 10 are plan views showing arrangement examples 1 to 4 of paper S on the first conveyor belt 8 of FIG.
　第１搬送ベルト８は、前述のように、複数の孔部８１と、複数の開口部８２と、を有する。開口部８２は、複数（例えば１０個）が集合することで開口部群８３を構成する。 As described above, the first transport belt 8 has a plurality of holes 81 and a plurality of openings 82. A plurality of (for example, 10) openings 82 are assembled to form an opening group 83.
　第１搬送ベルト８は、図６に示すように、用紙搬送方向Ｄｃの１周期Ｐｅにおいて、開口部群８３を複数有しており、本実施形態では６つ有している。開口部群８３は、用紙搬送方向Ｄｃの下流側から順に配置された、開口部群８３Ａ、８３Ｂ、８３Ｃ、８３Ｄ、８３Ｅ、８３Ｆを含む。孔部８１は、用紙搬送方向Ｄｃにおいて隣り合う開口部群８３の間に配置される。孔部８１は、開口部群８３が設けられた領域には配置されていない。 As shown in FIG. 6, the first transport belt 8 has a plurality of opening groups 83 in one cycle Pe of the paper transport direction Dc, and has six in the present embodiment. The opening group 83 includes the opening groups 83A, 83B, 83C, 83D, 83E, and 83F arranged in order from the downstream side of the paper transport direction Dc. The holes 81 are arranged between the adjacent opening groups 83 in the paper transport direction Dc. The hole 81 is not arranged in the area where the opening group 83 is provided.
　開口部群８３は、第１搬送ベルト８の用紙搬送方向Ｄｃの１周期Ｐｅにおいて、不等な間隔で配置されている。すなわち、用紙搬送方向Ｄｃにおいて隣り合う開口部群８３の間隔は、一定ではない。 The openings group 83 are arranged at unequal intervals in one cycle Pe of the paper transport direction Dc of the first transport belt 8. That is, the distance between the adjacent opening groups 83 in the paper transport direction Dc is not constant.
　開口部群８３は、例えば２つの開口部列８４を含む。開口部列８４は、複数（例えば５個）の開口部８２が用紙幅方向Ｄｗに沿って等間隔に並置されて構成される。２つの開口部列８４それぞれの開口部８２は、互いに用紙幅方向Ｄｗにずらして配置され、且つ一部が用紙搬送方向Ｄｃに重なるように配置される。フラッシング時、記録ヘッド５１のすべてのインク吐出ノズル５２から吐出されるインクは、開口部群８３のいずれかの開口部８２を通過する。 The opening group 83 includes, for example, two opening rows 84. The opening row 84 is configured by arranging a plurality of (for example, five) openings 82 at equal intervals along the paper width direction Dw. The openings 82 of each of the two opening rows 84 are arranged so as to be offset from each other in the paper width direction Dw, and a part thereof overlaps with the paper transport direction Dc. At the time of flushing, the ink ejected from all the ink ejection nozzles 52 of the recording head 51 passes through any opening 82 of the opening group 83.
　制御部７は、例えば第１搬送ベルト８上に吸着保持されて搬送される用紙Ｓと用紙Ｓとの間で、フラッシング（紙間フラッシング）を実行する。フラッシング時、制御部７は、第１搬送ベルト８の用紙搬送方向Ｄｃの１周期Ｐｅにおいて、インクを通過させる開口部群８３の組み合わせを、用紙Ｓのサイズに応じて決定する。制御部７は、操作部２１介して受け付けられて記憶部７１等に記憶された記録条件などの情報に基づき、用紙Ｓのサイズを認識する。 The control unit 7 executes flushing (between paper flushing) between the paper S and the paper S which are sucked and held on the first transport belt 8 and conveyed. At the time of flushing, the control unit 7 determines the combination of the openings group 83 through which the ink is passed in one cycle Pe of the paper transport direction Dc of the first transport belt 8 according to the size of the paper S. The control unit 7 recognizes the size of the paper S based on information such as recording conditions received via the operation unit 21 and stored in the storage unit 71 or the like.
　図７は、用紙ＳのサイズがＡ４サイズ（横置き）またはレターサイズ（横置き）である場合の、用紙Ｓの配置例１を示している。なお、「横置き」とは、長方形状の用紙Ｓの長手方向が用紙幅方向Ｄｗに沿うように配置した用紙Ｓの置き方である。用紙ＳのサイズがＡ４サイズ（横置き）またはレターサイズ（横置き）である場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｃ、８３Ｆを選択する。 FIG. 7 shows an arrangement example 1 of the paper S when the size of the paper S is A4 size (horizontal placement) or letter size (horizontal placement). The "horizontal placement" is a method of placing the paper S arranged so that the longitudinal direction of the rectangular paper S is along the paper width direction Dw. When the size of the paper S is A4 size (horizontal placement) or letter size (horizontal placement), the control unit 7 selects opening groups 83A, 83C, and 83F as the opening group 83 used for flushing.
　図８は、用紙ＳのサイズがＡ４サイズ（縦置き）またはレターサイズ（縦置き）である場合の、用紙Ｓの配置例２を示している。なお、「縦置き」とは、長方形状の用紙Ｓの長手方向が用紙搬送方向Ｄｃに沿うように配置した用紙Ｓの置き方である。用紙ＳのサイズがＡ４サイズ（縦置き）またはレターサイズ（縦置き）である場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｄを選択する。 FIG. 8 shows an arrangement example 2 of the paper S when the size of the paper S is A4 size (vertical placement) or letter size (vertical placement). The "vertical placement" is a method of placing the paper S arranged so that the longitudinal direction of the rectangular paper S is along the paper transport direction Dc. When the size of the paper S is A4 size (vertical placement) or letter size (vertical placement), the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
　図９は、用紙ＳのサイズがＡ３サイズ（縦置き）、Ｂ４サイズ（縦置き）またはリーガルサイズ（縦置き）である場合の、用紙Ｓの配置例３を示している。用紙ＳのサイズがＡ３サイズ（縦置き）、Ｂ４サイズ（縦置き）またはリーガルサイズ（縦置き）である場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｂ、８３Ｅを選択する。 FIG. 9 shows an arrangement example 3 of the paper S when the size of the paper S is A3 size (vertical placement), B4 size (vertical placement) or legal size (vertical placement). When the size of the paper S is A3 size (vertical installation), B4 size (vertical installation) or legal size (vertical installation), the control unit 7 uses the opening group 83 as the opening group 83A, 83B, as the opening group 83 used for flushing. Select 83E.
　図１０は、用紙Ｓのサイズが１３インチ×１９．２インチである場合の、用紙Ｓの配置例４を示している。用紙Ｓのサイズが１３インチ×１９．２インチである場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｄを選択する。 FIG. 10 shows an arrangement example 4 of the paper S when the size of the paper S is 13 inches × 19.2 inches. When the size of the paper S is 13 inches × 19.2 inches, the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
　制御部７は、第１ベルトセンサー４１３及び第２ベルトセンサー４１４（ともに図４参照）から受信した開口部群８３の検知信号に基づき、第１搬送ベルト８に対して用紙Ｓを送り出すレジストローラー対４５の回転を制御し、さらにインク吐出ノズル５２からのインク吐出動作を制御する。これにより、用紙Ｓは、フラッシングに用いる開口部群８３として選択された開口部群８３Ａ、８３Ｂ、８３Ｃ、８３Ｄ、８３Ｅ、８３Ｆの領域を避けて、第１搬送ベルト８上に配置される。そして、フラッシングのインクは、フラッシングに用いる開口部群８３として選択された開口部群８３Ａ、８３Ｂ、８３Ｃ、８３Ｄ、８３Ｅ、８３Ｆの開口部８２を通過し、インク受け部１０内に収容される。 The control unit 7 is a resist roller pair that feeds the paper S to the first conveyor belt 8 based on the detection signals of the opening group 83 received from the first belt sensor 413 and the second belt sensor 414 (both see FIG. 4). The rotation of the 45 is controlled, and the ink ejection operation from the ink ejection nozzle 52 is further controlled. As a result, the paper S is arranged on the first transport belt 8 while avoiding the regions of the opening groups 83A, 83B, 83C, 83D, 83E, and 83F selected as the opening group 83 used for flushing. Then, the flushing ink passes through the openings 82 of the opening groups 83A, 83B, 83C, 83D, 83E, and 83F selected as the opening group 83 used for flushing, and is stored in the ink receiving portion 10.
　次に、第２実施形態の第１搬送ベルト８の構成について、図１１、図１２、図１３、図１４及び図１５を用いて説明する。図１１は、本発明の第２実施形態のインクジェット記録装置１の第１ベルト搬送部４１の第１搬送ベルト８の平面図である。図１２～図１５は、図１１の第１搬送ベルト８上の用紙Ｓの配置例１～配置例４を示す平面図である。 Next, the configuration of the first transport belt 8 of the second embodiment will be described with reference to FIGS. 11, 12, 13, 14, and 15. FIG. 11 is a plan view of the first conveyor belt 8 of the first belt conveyor 41 of the inkjet recording apparatus 1 of the second embodiment of the present invention. 12 to 15 are plan views showing arrangement examples 1 to 4 of paper S on the first conveyor belt 8 of FIG.
　第２実施形態の第１搬送ベルト８は、図１１に示すように、複数の開口部８２を有する。開口部８２は、第１搬送ベルト８の全域にわたって配置される。第２実施形態の第１搬送ベルト８は、第１実施形態の第１搬送ベルト８（図６参照）で見られた複数の孔部８１に相当する構成を有していない。第２実施形態において、開口部８２は、第１搬送ベルト８に用紙Ｓを吸着させる孔部を兼ねている。すなわち、第２実施形態において、第１搬送ベルト８の、用紙Ｓを吸着させる孔部は、開口部８２と同一形状である。 As shown in FIG. 11, the first transport belt 8 of the second embodiment has a plurality of openings 82. The opening 82 is arranged over the entire area of the first transport belt 8. The first transport belt 8 of the second embodiment does not have a configuration corresponding to the plurality of holes 81 seen in the first transport belt 8 of the first embodiment (see FIG. 6). In the second embodiment, the opening 82 also serves as a hole for adsorbing the paper S on the first transport belt 8. That is, in the second embodiment, the hole portion of the first transport belt 8 for adsorbing the paper S has the same shape as the opening portion 82.
　開口部８２は、複数（例えば５個）が用紙幅方向Ｄｗに沿って等間隔に並置されることで開口部列８４を構成する。開口部列８４は、第１搬送ベルト８の用紙搬送方向Ｄｃに沿って等間隔で配置されている。用紙搬送方向Ｄｃに隣り合う開口部列８４それぞれの開口部８２は、互いに用紙幅方向Ｄｗにずらして配置され、且つ一部が用紙搬送方向Ｄｃに重なるように配置される。 A plurality of (for example, five) openings 82 are juxtaposed at equal intervals along the paper width direction Dw to form an opening row 84. The opening rows 84 are arranged at equal intervals along the paper transport direction Dc of the first transport belt 8. The openings 82 of each of the opening rows 84 adjacent to the paper transport direction Dc are arranged so as to be offset from each other in the paper width direction Dw, and a part thereof overlaps with the paper transport direction Dc.
　開口部群８３は、用紙搬送方向Ｄｃに隣り合う２つの開口部列８４で構成される。第１搬送ベルト８は、図１１に示すように、用紙搬送方向Ｄｃの１周期Ｐｅにおいて、開口部群８３を複数有している。開口部群８３は、用紙搬送方向Ｄｃの下流側から順に配置された、開口部群８３Ａ、８３Ｂ、８３Ｃ、８３Ｄ、８３Ｅ、８３Ｆを含む（図１２、図１３、図１４及び図１５参照）。 The opening group 83 is composed of two opening rows 84 adjacent to each other in the paper transport direction Dc. As shown in FIG. 11, the first transport belt 8 has a plurality of openings group 83 in one cycle Pe of the paper transport direction Dc. The opening group 83 includes the opening groups 83A, 83B, 83C, 83D, 83E, and 83F arranged in order from the downstream side of the paper transport direction Dc (see FIGS. 12, 13, 14, and 15).
　図１２は、用紙ＳのサイズがＡ４サイズ（横置き）またはレターサイズ（横置き）である場合の、用紙Ｓの配置例１を示している。用紙ＳのサイズがＡ４サイズ（横置き）またはレターサイズ（横置き）である場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｃ、８３Ｆを選択する。 FIG. 12 shows an arrangement example 1 of the paper S when the size of the paper S is A4 size (horizontal placement) or letter size (horizontal placement). When the size of the paper S is A4 size (horizontal placement) or letter size (horizontal placement), the control unit 7 selects opening groups 83A, 83C, and 83F as the opening group 83 used for flushing.
　図１３は、用紙ＳのサイズがＡ４サイズ（縦置き）またはレターサイズ（縦置き）である場合の、用紙Ｓの配置例２を示している。用紙ＳのサイズがＡ４サイズ（縦置き）またはレターサイズ（縦置き）である場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｄを選択する。 FIG. 13 shows an arrangement example 2 of the paper S when the size of the paper S is A4 size (vertical placement) or letter size (vertical placement). When the size of the paper S is A4 size (vertical placement) or letter size (vertical placement), the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
　図１４は、用紙ＳのサイズがＡ３サイズ（縦置き）、Ｂ４サイズ（縦置き）またはリーガルサイズ（縦置き）である場合の、用紙Ｓの配置例３を示している。用紙ＳのサイズがＡ３サイズ（縦置き）、Ｂ４サイズ（縦置き）またはリーガルサイズ（縦置き）である場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｂ、８３Ｅを選択する。 FIG. 14 shows an arrangement example 3 of the paper S when the size of the paper S is A3 size (vertical placement), B4 size (vertical placement) or legal size (vertical placement). When the size of the paper S is A3 size (vertical installation), B4 size (vertical installation) or legal size (vertical installation), the control unit 7 uses the opening group 83 as the opening group 83A, 83B, as the opening group 83 used for flushing. Select 83E.
　図１５は、用紙Ｓのサイズが１３インチ×１９．２インチである場合の、用紙Ｓの配置例４を示している。用紙Ｓのサイズが１３インチ×１９．２インチである場合、制御部７は、フラッシングに用いる開口部群８３として、開口部群８３Ａ、８３Ｄを選択する。 FIG. 15 shows an arrangement example 4 of the paper S when the size of the paper S is 13 inches × 19.2 inches. When the size of the paper S is 13 inches × 19.2 inches, the control unit 7 selects the opening groups 83A and 83D as the opening group 83 used for flushing.
　上記の構成のように、第１搬送ベルト８の、用紙Ｓを吸着させる孔部は、開口部８２と同一形状であるので、フラッシングに用いる開口部群８３として、いずれの開口部群８３をも選択することができる。したがって、フラッシングを容易に実行することが可能である。また、第１搬送ベルト８に設けられた孔部及び開口部８２がすべて同じ形状であることで、第１搬送ベルト８を容易に製造することができる。 As described above, since the hole portion of the first transport belt 8 for adsorbing the paper S has the same shape as the opening portion 82, any opening group 83 can be used as the opening group 83 used for flushing. You can choose. Therefore, flushing can be easily performed. Further, since the holes and openings 82 provided in the first transport belt 8 all have the same shape, the first transport belt 8 can be easily manufactured.
　以上、本発明の実施形態につき説明したが、本発明の範囲はこれに限定されるものではなく、発明の主旨を逸脱しない範囲で種々の変更を加えて実施することができる。 Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the gist of the invention.
　本発明は、インクジェット記録装置において利用可能である。 The present invention can be used in an inkjet recording device.
　１　　　インクジェット記録装置
　５　　　記録部
　７　　　制御部
　８　　　第１搬送ベルト（搬送ベルト）
　９　　　用紙吸引部（第１吸引部、第２吸引部）
　１０　　　インク受け部
　１１　　　インク排出部
　５１　　　記録ヘッド
　５２　　　インク吐出ノズル
　８１　　　孔部
　８２　　　開口部
　９３　　　連通部
　１１１　　　逆流防止弁
　Ｄｃ　　　用紙搬送方向
　Ｄｗ　　　用紙幅方向
　Ｓ　　　用紙（記録媒体）
　Ｓｎ　　　非対向区間
　Ｓｏ　　　対向区間 1 Inkjet recording device 5 Recording unit 7 Control unit 8 First transport belt (convey belt)
9 Paper suction part (1st suction part, 2nd suction part)
10 Ink receiving part 11 Ink discharging part 51 Recording head 52 Ink ejection nozzle 81 Hole part 82 Opening part 93 Communication part 111 Backflow prevention valve Dc Paper transport direction Dw Paper width direction S Paper (recording medium)
Sn non-opposing section So facing section

Claims (5)

  1. 　インクを吐出する複数のノズルを有する記録ヘッドと、
    　記録媒体を吸着させる複数の孔部、及び前記記録ヘッドから吐出される前記インクが通過する複数の開口部を有して前記記録ヘッドと対向する位置に前記記録媒体を搬送する無端状の搬送ベルトと、
    　前記搬送ベルトの記録媒体搬送面の反対側の一面に対向する吸引空間内の空気を前記孔部及び前記開口部を通して吸引することで前記記録媒体を前記搬送ベルトの前記記録媒体搬送面に吸着させる第１吸引部と、
    　前記搬送ベルトを隔てて前記記録ヘッドの下方に配置され、前記記録媒体に対する前記インクの吐出タイミングとは異なるタイミングで、前記記録ヘッドに前記インクを吐出させるフラッシング時に、前記開口部を通過した前記インクを受けるインク受け部と、
    　前記インク受け部内に貯留される前記インクの最上面よりも上方の空間から空気を吸引する第２吸引部と、
    　を備えることを特徴とするインクジェット記録装置。     A recording head with multiple nozzles that eject ink,
    An endless transport belt that has a plurality of holes for adsorbing the recording medium and a plurality of openings through which the ink ejected from the recording head passes, and transports the recording medium to a position facing the recording head. When,
    The recording medium is attracted to the recording medium transport surface of the transport belt by sucking air in the suction space facing the opposite surface of the recording medium transport surface of the transport belt through the holes and the openings. The first suction part and
    The ink that is arranged below the recording head across the transport belt and has passed through the opening at the time of flushing to eject the ink to the recording head at a timing different from the timing of ejecting the ink to the recording medium. Ink receiving part to receive and
    A second suction portion that sucks air from a space above the uppermost surface of the ink stored in the ink receiving portion, and a second suction portion.
    An inkjet recording device characterized by being equipped with.
  2. 　前記吸引空間と、前記インク受け部内の空間とを連通させる連通部を有し、
    　前記第１吸引部は、前記連通部を介して前記インク受け部内の空気を吸引することで前記第２吸引部を兼ねることを特徴とする請求項１に記載のインクジェット記録装置。     It has a communication portion that communicates the suction space with the space inside the ink receiving portion.
    The inkjet recording apparatus according to claim 1, wherein the first suction unit also serves as the second suction unit by sucking air in the ink receiving portion through the communication portion.
  3. 　前記第１吸引部及び前記第２吸引部により前記孔部及び前記開口部を通して空気を吸引する吸引力は、前記記録ヘッドと前記インク受け部とが対向する対向区間よりも、前記対向区間に対して前記記録媒体の搬送方向の上流側及び下流側の非対向区間のほうが強いことを特徴とする請求項１または請求項２に記載のインクジェット記録装置。 The suction force for sucking air through the hole and the opening by the first suction portion and the second suction portion is applied to the facing section rather than the facing section where the recording head and the ink receiving portion face each other. The inkjet recording apparatus according to claim 1 or 2, wherein the non-opposing sections on the upstream side and the downstream side in the transport direction of the recording medium are stronger.
  4. 　前記インク受け部内に貯留される前記インクを排出するインク排出部を有し、
    　前記インク排出部は、前記インク受け部から排出された前記インクが前記インク受け部に逆流することを防止する逆流防止弁を有することを特徴とする請求項１から請求項３のいずれかに記載のインクジェット記録装置。     It has an ink discharging part that discharges the ink stored in the ink receiving part, and has an ink discharging part.
    The invention according to any one of claims 1 to 3, wherein the ink discharging unit has a check valve for preventing the ink discharged from the ink receiving unit from flowing back to the ink receiving unit. Inkjet recording device.
  5. 　前記孔部は、前記開口部と同一形状であることを特徴とする請求項１から請求項４のいずれかに記載のインクジェット記録装置。 The inkjet recording apparatus according to any one of claims 1 to 4, wherein the hole portion has the same shape as the opening portion.
PCT/JP2021/022605 2020-06-29 2021-06-15 Inkjet recording device WO2022004348A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207578A (en) * 1979-01-08 1980-06-10 The Mead Corporation Catch trough for a jet drop recorder
JP2006159556A (en) * 2004-12-06 2006-06-22 Seiko Epson Corp Liquid ejecting apparatus and liquid spare ejection method in liquid ejecting apparatus
JP2010023374A (en) * 2008-07-22 2010-02-04 Brother Ind Ltd Image recording device
JP2010264649A (en) * 2009-05-14 2010-11-25 Ricoh Elemex Corp Inkjet recording device
JP2015160425A (en) * 2014-02-28 2015-09-07 株式会社リコー Inkjet recording device
JP2016159463A (en) * 2015-02-27 2016-09-05 理想科学工業株式会社 Inkjet recording device and ink cartridge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207578A (en) * 1979-01-08 1980-06-10 The Mead Corporation Catch trough for a jet drop recorder
JP2006159556A (en) * 2004-12-06 2006-06-22 Seiko Epson Corp Liquid ejecting apparatus and liquid spare ejection method in liquid ejecting apparatus
JP2010023374A (en) * 2008-07-22 2010-02-04 Brother Ind Ltd Image recording device
JP2010264649A (en) * 2009-05-14 2010-11-25 Ricoh Elemex Corp Inkjet recording device
JP2015160425A (en) * 2014-02-28 2015-09-07 株式会社リコー Inkjet recording device
JP2016159463A (en) * 2015-02-27 2016-09-05 理想科学工業株式会社 Inkjet recording device and ink cartridge

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