WO2018225551A1 - Tête à jet d'encre et dispositif d'impression à jet d'encre - Google Patents

Tête à jet d'encre et dispositif d'impression à jet d'encre Download PDF

Info

Publication number
WO2018225551A1
WO2018225551A1 PCT/JP2018/020281 JP2018020281W WO2018225551A1 WO 2018225551 A1 WO2018225551 A1 WO 2018225551A1 JP 2018020281 W JP2018020281 W JP 2018020281W WO 2018225551 A1 WO2018225551 A1 WO 2018225551A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink discharge
pressure chamber
flow path
ink
discharge path
Prior art date
Application number
PCT/JP2018/020281
Other languages
English (en)
Japanese (ja)
Inventor
光 濱野
章人 下村
Original Assignee
コニカミノルタ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to JP2019523457A priority Critical patent/JP7047840B2/ja
Publication of WO2018225551A1 publication Critical patent/WO2018225551A1/fr

Links

Images

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
    • 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
    • B41J2/18—Ink recirculation systems
    • 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
    • B41J2/19—Ink jet characterised by ink handling for removing air bubbles
    • 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
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B41J2002/14225—Finger type piezoelectric element on only one side of the chamber
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/20—Modules

Definitions

  • the present invention relates to an inkjet head and an inkjet recording apparatus.
  • an ink jet recording apparatus that forms an image on a recording medium by ejecting ink stored in a pressure chamber from a plurality of nozzles provided in the ink jet head is known.
  • the nozzles are clogged due to bubbles generated in the ink jet head, foreign matters mixed therein, or the like, resulting in problems such as defective injection.
  • the ink viscosity near the nozzle may increase due to sedimentation of ink particles, and it may be difficult to obtain stable ink ejection performance.
  • Patent Document 1 discloses an ink jet head provided with an individual ink discharge path capable of discharging ink from each pressure chamber and a common ink discharge path where a plurality of individual ink discharge paths merge in the head. Has been.
  • the flow path resistance is reduced by increasing the cross-sectional area of the individual ink discharge path, etc., and the ink can easily flow into the individual ink discharge path.
  • the circulation flow rate it is necessary to increase the circulation flow rate.
  • it is necessary to increase the flow resistance of the individual ink discharge path so that the pressure wave (ejecting energy) when ejecting ink does not escape to the individual ink discharge path.
  • the necessity of reducing the flow resistance of the individual ink discharge path described above conflicts with the necessity of increasing the resistance.
  • the present invention has been made in view of such problems, and an object of the present invention is to secure an ink discharge flow rate from a pressure chamber for effectively removing air bubbles and foreign matters in the head chip together with ink. Another object of the present invention is to provide an ink jet head and an ink jet recording apparatus capable of suppressing pressure wave escape from a pressure chamber to an individual ink discharge path.
  • the invention according to claim 1 is an inkjet head, A plurality of nozzles for ejecting ink; A plurality of pressure chambers communicating with each of the plurality of nozzles and storing ink; A plurality of pressure generating means provided corresponding to each of the plurality of pressure chambers, for applying pressure to the ink in the pressure chamber; A plurality of individual ink discharge paths that are branched from each of the plurality of pressure chambers and capable of discharging ink in the plurality of pressure chambers; A common ink discharge path connected to the plurality of individual ink discharge paths, The individual ink discharge path has an enlarged flow path whose flow path cross-sectional area increases in the direction from the pressure chamber to the common ink discharge path.
  • the invention according to claim 2 is the ink jet head according to claim 1,
  • the enlarged flow path has a throttle portion having a uniform flow path cross-sectional area over a predetermined length in the flow path central axis direction, and the opposite side of the throttle portion to the pressure chamber is closer to the flow path cross-sectional area than the throttle portion. Is expanding.
  • the invention according to claim 3 is the ink jet head according to claim 2,
  • the throttle portion is continuous in contact with the pressure chamber.
  • the expanded flow path has a tapered flow path whose flow path cross-sectional area expands at a constant rate in a direction from the pressure chamber to the common ink discharge path.
  • the invention according to claim 5 is the inkjet head according to claim 4,
  • the tapered channel changes only in the channel cross-sectional width in the axial direction of the nozzle.
  • the invention according to claim 6 is the ink jet head according to claim 5,
  • the flow path cross-sectional width in the direction perpendicular to the axial direction of the nozzle at least at the connection end of the individual ink discharge path with the pressure chamber coincides with the width of the pressure chamber in the same direction.
  • the invention according to claim 7 is the inkjet head according to any one of claims 1 to 6,
  • the individual ink discharge path has a throttle portion on the common ink discharge path side with respect to the enlarged flow path.
  • the invention according to claim 8 is the inkjet head according to any one of claims 1 to 7, An upstream minimum channel cross section of the enlarged channel is connected to the pressure chamber.
  • the invention according to claim 9 is the inkjet head according to any one of claims 1 to 8, At least two individual ink discharge paths are provided in each of the plurality of pressure chambers.
  • the invention according to claim 10 is an ink jet recording apparatus, An inkjet head according to any one of claims 1 to 9, Ink supply means for generating a circulating flow from the pressure chamber to the individual ink discharge path; Is provided.
  • an ink discharge flow rate from the pressure chamber for effectively removing bubbles, foreign matters, and the like in the head chip together with the ink, and to prevent a pressure wave from the pressure chamber to the individual ink discharge path.
  • An inkjet head and an inkjet recording apparatus that can be suppressed can be provided.
  • FIG. 1 Schematic diagram showing inkjet recording device Bottom view of head unit Perspective view of inkjet head Cross section of inkjet head Exploded perspective view of inkjet head Exploded perspective view of head chip Plan view of pressure chamber substrate Bottom view of pressure chamber substrate Plan view of channel spacer substrate Bottom view of channel spacer substrate Top view of the nozzle substrate Sectional view of the head chip when cut with IXA-IXA Cross section of the head chip when cut with IXB-IXB Cross section of the head chip when cut with XA-XB Cross section of the head chip when cut with XA-XB Schematic diagram showing the ink circulation system 3D drawing of an example of the pressure chamber, nozzle and first individual ink discharge path A drawing in which another example of the pressure chamber, the nozzle and the first individual ink discharge path is three-dimensionally drawn.
  • the print width direction which is the arrangement direction of the nozzles 111 of the inkjet head 100
  • the direction in which the recording medium is conveyed below the nozzles 111 is the front-back direction
  • the left-right direction is the direction in which the recording medium is conveyed below the nozzles 111
  • the direction perpendicular to the front-rear direction will be described as the vertical direction.
  • the arrow in the flow path of drawing shows the direction through which ink flows.
  • the ink jet recording apparatus 200 includes a paper feed unit 210, an image recording unit 220, a paper discharge unit 230, an ink circulation system 8 (see FIG. 11) as an ink supply unit, and the like.
  • the ink jet recording apparatus 200 conveys the recording medium M stored in the paper feeding unit 210 to the image recording unit 220, forms an image on the recording medium M with the image recording unit 220, and discharges the recording medium M on which the image is formed. Transport to paper section 230.
  • the paper feed unit 210 includes a paper feed tray 211 that stores the recording medium M, and a medium supply unit 212 that conveys and supplies the recording medium M from the paper feed tray 211 to the image recording unit 220.
  • the medium supply unit 212 includes a ring-shaped belt that is supported by two rollers on the inside, and the recording medium M is removed from the paper feed tray 211 by rotating the roller while the recording medium M is placed on the belt. The image is transferred to the image recording unit 220.
  • the image recording unit 220 includes a transport drum 221, a delivery unit 222, a heating unit 223, a head unit 224, a fixing unit 225, a delivery unit 226, and the like.
  • the transport drum 221 has a cylindrical surface, and the outer peripheral surface thereof is a transport surface on which the recording medium M is placed.
  • the conveyance drum 221 conveys the recording medium M along the conveyance surface by rotating in the direction of the arrow in FIG. 1 while holding the recording medium M on the conveyance surface.
  • the transport drum 221 includes a claw portion and an air intake portion (not shown), presses the end of the recording medium M by the claw portion, and sucks the recording medium M to the transport surface by the air intake portion. The recording medium M is held.
  • the delivery unit 222 is provided at a position between the medium supply unit 212 and the conveyance drum 221 of the paper supply unit 210, and picks up one end of the recording medium M conveyed from the medium supply unit 212 by the swing arm unit 222a. Then, it is delivered to the transport drum 221 through the delivery drum 222b.
  • the heating unit 223 is provided between the arrangement position of the transfer drum 222b and the arrangement position of the head unit 224, and the recording medium M conveyed by the conveyance drum 221 has a temperature within a predetermined temperature range. Heat M.
  • the heating unit 223 includes, for example, an infrared heater, and energizes the infrared heater based on a control signal supplied from a control unit (not shown) to cause the heater to generate heat.
  • the head unit 224 forms an image by ejecting ink to the recording medium M at an appropriate timing according to the rotation of the transport drum 221 holding the recording medium M based on the image data.
  • the head unit 224 is disposed at a predetermined distance with the ink ejection surface facing the transport drum 221.
  • four head units 224 corresponding respectively to four colors of ink of yellow (Y), magenta (M), cyan (C), and black (K) are included in the recording medium M.
  • Y, M, C, and K black
  • the head unit 224 for example, as shown in FIG. 2, a pair of inkjet heads 100 adjacent to each other in the front-rear direction are arranged in a staggered manner at different positions in the front-rear direction. Further, the head unit 224 is used with its position relative to the rotation axis of the transport drum 221 fixed when recording an image. That is, the ink jet recording apparatus 200 is an ink jet recording apparatus 200 that performs one-pass drawing type image recording using a line head.
  • the fixing unit 225 includes a light emitting unit arranged over the width of the transport drum 221 in the X direction, and irradiates the recording medium M placed on the transport drum 221 with energy rays such as ultraviolet rays from the light emitting unit. Then, the ink ejected on the recording medium M is cured and fixed.
  • the light emitting unit of the fixing unit 225 is disposed opposite to the conveyance surface on the downstream side of the arrangement position of the head unit 224 and the upstream side of the arrangement position of the delivery drum 226a of the delivery unit 226 in the conveyance direction.
  • the delivery unit 226 includes a belt loop 226b having an annular belt supported on the inside by two rollers, and a cylindrical delivery drum 226a that delivers the recording medium M from the transport drum 221 to the belt loop 226b.
  • the recording medium M transferred from the transport drum 221 onto the belt loop 226b by the transfer drum 226a is transported by the belt loop 226b and sent to the paper discharge unit 230.
  • the paper discharge unit 230 includes a plate-shaped paper discharge tray 231 on which the recording medium P sent out from the image recording unit 220 by the delivery unit 226 is placed.
  • the inkjet head 100 includes a head chip 1, a wiring board 2 on which the head chip 1 is disposed, a wiring board 2, and a flexible board 3.
  • a manifold 5 for storing ink to be supplied to the pressure chamber 131 in the head chip 1, a housing 6 in which the manifold 5 is housed, and a bottom opening of the housing 6 are closed.
  • the cap receiving plate 7 attached in this way, the cover member 9 attached to the housing 6 and the like are provided.
  • 3A illustration of the manifold 5 is omitted
  • FIG. 3B and FIG. 4 illustration of the cover member 9 is omitted.
  • the number of nozzles 111 of the head chip 1 is four will be described.
  • the number and arrangement of the nozzles 111 can be changed as appropriate, for example, from one to three rows. Either may be sufficient and five or more rows may be sufficient.
  • the head chip 1 is a substantially quadrangular prism-like member elongated in the left-right direction, and is configured by sequentially stacking a pressure chamber substrate 13, a flow path spacer substrate 12, and a nozzle substrate 11 (FIGS. 5 to 11). ).
  • the pressure chamber substrate 13 is provided with a pressure chamber 131, an air chamber 132, a common ink discharge path 133, and the like (see FIGS. 5, 6A, and 6B).
  • a large number of pressure chambers 131 and air chambers 132 are provided so as to be alternately arranged in the left-right direction, and are provided in four rows in the front-rear direction.
  • the pressure chamber 131 has a substantially rectangular cross section and is formed along the vertical direction.
  • the pressure chamber 131 has an inlet on the upper surface of the pressure chamber substrate 13 and an outlet on the lower surface.
  • the pressure chamber 131 communicates with the ink reservoir 51 at the upper end, and ink is supplied from the ink reservoir 51 to the pressure chamber 131 and ejected from the nozzle 111 into the pressure chamber 131. Ink for storing is stored. Further, the pressure chamber 131 is formed along the vertical direction so as to have a substantially rectangular cross section of the same area, straddling the pressure chamber substrate 13 and the flow path spacer substrate 12. This part communicates with the nozzle 111 (see FIG. 9A, FIG. 9B, etc.).
  • the air chamber 132 has a substantially rectangular cross section that is slightly larger than the pressure chamber 131 and is formed to be parallel to the pressure chamber 131 along the vertical direction. Further, unlike the pressure chamber 131, the air chamber 132 is not communicated with the ink reservoir 51, so that ink does not flow into the air chamber 132. Moreover, the air chamber 132 is not connected also to the nozzle 111 (refer FIG. 9A, FIG. 9B etc.).
  • the pressure chamber 131 and the air chamber 132 are formed to be separated from each other by a partition wall 136 as pressure generating means formed of a piezoelectric material (see FIG. 10A).
  • the partition wall 136 is provided with a drive electrode (not shown), and when a voltage is applied to the drive electrode, the partition wall 136 portion between the adjacent pressure chambers 131 repeats a shear mode type displacement, whereby the inside of the pressure chamber 131. Pressure is applied to the ink.
  • the pressure chamber 131 shown in FIGS. 5 to 10 and the like does not use the pressure chamber 131 located at the end in the left-right direction, which has the partition wall 136 only on one side, and the pressure chamber 131 on the other side.
  • the chamber 131 is used.
  • the air chamber 132 may not be provided and only the pressure chamber 131 may be formed, it is preferable to alternately provide the pressure chamber 131 and the air chamber 132 as described above. Accordingly, the pressure chambers 131 can be prevented from being adjacent to each other, so that when the partition wall 136 adjacent to one pressure chamber 131 is deformed, the other pressure chambers 131 are not affected.
  • the common ink discharge path 133 is configured by connecting a first common ink discharge path 134 and a second common ink discharge path 135 (see FIGS. 5 and 6B and the like).
  • the first common ink discharge path 134 avoids a portion where the pressure chamber 131 and the air chamber 132 are provided on the lower surface side of the pressure chamber substrate 13, so that the front side, the rear side, and the center portion of the head chip 1 are disposed.
  • three rows are provided along the left-right direction.
  • a plurality of individual ink discharge paths 121 provided on the flow path spacer substrate 12 are connected to the lower surface side of the first common ink discharge path 134, and these individual ink discharge paths 121 (second individual ink discharge paths 123) are connected.
  • the first common ink discharge path 134 (FIGS. 6B, 7A, and 9A).
  • the first common ink discharge path 134 is connected to a second common ink discharge path 135 that can discharge ink to the outside of the head chip 1 near the right end. Therefore, the first common ink discharge path 134 is a flow path in which the ink flowing from the individual ink discharge path 121 (second individual ink discharge path 123) flows toward the second common ink discharge path 135. .
  • the second common ink discharge path 135 is formed along the vertical direction, like the pressure chamber 131.
  • the second common ink discharge path 135 has a lower surface side of the pressure chamber substrate 13 communicating with the first common ink discharge path 134, and an upper surface side thereof connected with the discharge liquid chamber 57. This is a flow path for discharging the ink flowing from 134 toward the upper side (the side opposite to the nozzle substrate 11 side) to the outside of the head chip 1.
  • the second common ink discharge path 135 is provided near the right end of the head chip 1 and communicates with the first common ink discharge path 134. Further, by providing the second common ink discharge path 135 so as to have a larger volume than the individual pressure chambers 131, the ink discharge efficiency can be increased.
  • the flow path spacer substrate 12 is formed with a pressure chamber 131 and an individual ink discharge path 121 branched from the pressure chamber 131 (FIGS. 5, 7A, 7B, 9A and 9A and 9B). 9B etc.).
  • the pressure chamber 131 is formed along the vertical direction so as to straddle the flow path spacer substrate 12 and the pressure chamber substrate 13 and to have a substantially rectangular cross section of the same area.
  • the individual ink discharge path 121 has one end connected to the pressure chamber 131 and the other end connected to the first common ink discharge path 134, and discharges the ink in the pressure chamber 131 to the first common ink discharge path 134. It is a flow path. It is preferable that at least two individual ink discharge paths 121 are provided in each of the pressure chambers 131 from the viewpoint of facilitating discharge of bubbles, foreign matter, and the like together with ink. In addition, for example, as shown in FIGS. 9A and 9B, two individual ink discharge paths 121 are provided, one each in the front direction and the rear direction of the pressure chamber 131, so that bubbles, foreign matters, and the like can be formed together with the ink. It is preferable because the effect of facilitating discharge can be obtained and the production efficiency is high.
  • the individual ink discharge path 121 is configured by connecting a first individual ink discharge path 122 and a second individual ink discharge path 123.
  • One end of the first individual ink discharge path 122 is connected to the pressure chamber 131, and extends in the front-rear direction on the lower surface side portion of the flow path spacer substrate 12.
  • the second individual ink discharge path 123 is connected to the other end of the first individual ink discharge path 122, extends upward, and is connected to the first common ink discharge path 134.
  • the individual ink discharge path 121 has an enlarged flow path whose flow path cross-sectional area increases in the direction from the pressure chamber 131 to the common ink discharge path 133. This is because the circulation flow rate is secured and the escape of the pressure wave from the pressure chamber 131 to the individual ink discharge path 121 is suppressed.
  • FIGS. 12 to 17 illustrate the pressure chamber 131, the nozzle 111, and the first individual ink discharge path 122 in a three-dimensional manner, and show different structures. Hereinafter, it demonstrates in order. Note that one first individual ink discharge path 122 connected to the pressure chamber 131 is representatively shown, but each of the plurality of first individual ink discharge paths 122 connected to the pressure chamber 131 may be implemented with the same structure. preferable.
  • a portion formed on the pressure chamber substrate 13 is 131B, and a portion formed on the flow path spacer substrate 12 is 131A.
  • the first individual ink discharge path 122 is connected to the pressure chamber 131A.
  • the first individual ink discharge path 122 shown in FIG. 12 includes a narrow section 122a having a uniform cross section connected to the pressure chamber 131, a tapered flow path 122b connected to the narrow section 122a, and a uniform cross section flow path 122c connected thereto.
  • the enlarged flow path whose flow path cross-sectional area increases in the direction from the pressure chamber 131 to the common ink discharge path 133 includes a throttle section 122a having a uniform cross section and a tapered flow path 122b.
  • the throttle section 122a having a uniform cross section is a flow path having a uniform flow path cross-sectional area over a predetermined length in the flow path central axis direction.
  • the flow path cross-sectional area is larger than that of the throttle part 122a because the opposite side (downstream side) of the throttle part 122a with a uniform cross section with respect to the pressure chamber 131 is the tapered flow path 122b, so that the enlarged flow paths (122a, 122b) Is made.
  • the throttle part 122a is in contact with the pressure chamber 131 and is continuous. That is, when viewed from the pressure chamber 131, the inlet of the individual ink discharge path 121 is the throttle portion 122a.
  • the taper flow path 122b has a flow path cross-sectional area that increases at a constant rate in the direction from the pressure chamber 131 to the common ink discharge path 133.
  • the restricting portion 122a is restricted only in the channel cross-sectional width in the left-right direction.
  • the tapered channel 122b changes only in the channel cross-sectional width in the left-right direction.
  • the left-right direction is a direction perpendicular to the central axis of the flow path in the first individual ink discharge path 122 and the axial direction of the nozzle 111.
  • the flow path cross section of the throttle portion 122a matches the upstream minimum flow path cross section of the tapered flow path 122b, the downstream maximum flow path cross section of the taper flow path 122b matches the flow path cross section of the uniform cross section flow path 122c,
  • the throttle part 122a, the tapered channel 122b, and the uniform cross-sectional channel 122c are continuous.
  • the first individual ink discharge path 122 shown in FIGS. 13 and 14 has a tapered flow path 122b.
  • the entire first individual ink discharge path 122 may be a tapered flow path 122b as shown in FIG. 13, or a part may be a tapered flow path 122b as shown in FIG.
  • the tapered channel 122b is an enlarged channel (122b).
  • the upstream minimum flow passage section of the tapered flow path 122 b is connected to the pressure chamber 131, and the uniform cross-section flow path 122 c is connected to the downstream maximum flow path section. This is to suppress the escape of the pressure wave from the pressure chamber 131 to the individual ink discharge path 121.
  • the first individual ink discharge path 122 shown in FIG. 15 is obtained by forming a narrowed section 122a with a uniform cross section thinly in the direction of the central axis of the flow path. To the (downstream side), a uniform cross-sectional flow path 122c having a flow path cross-sectional area larger than that of the throttle portion 122a is connected. With this structure, the escape of pressure waves from the pressure chamber 131 to the individual ink discharge path 121 can be effectively suppressed.
  • the first individual ink discharge path 122 shown in FIG. 16 has an enlarged flow path composed of a narrowed portion 122a having a uniform cross section at the upstream end and a tapered flow path 122b connected to the same as in the structure shown in FIG.
  • the narrowed portion 122e is provided on the common ink discharge path 133 side (downstream side) from the enlarged flow paths (122a, 122b). Thereby, the backflow of the ink from the common ink discharge path 133 is suppressed.
  • FIG. 16 has an enlarged flow path composed of a narrowed portion 122a having a uniform cross section at the upstream end and a tapered flow path 122b connected to the same as in the structure shown in FIG.
  • the narrowed portion 122e is provided on the common ink discharge path 133 side (downstream side) from the enlarged flow paths (122a, 122b).
  • the narrowed portion 122e has a uniform cross section, and the tapered flow passage 122d whose flow cross sectional area is reduced is provided on the upstream side thereof, but only the narrowed portion having a uniform cross section is provided. Further, it is possible to modify only the tapered flow path. Further, since the downstream narrowed portions (122d, 122e) may be located downstream of the enlarged ink flow path and in front of the common ink discharge path 133 in the individual ink discharge path 121, the downstream narrow section (122d, 122e) It may be provided.
  • the first individual ink discharge path 122 shown in FIG. 17 has a tapered flow path 122f.
  • the tapered channel 122f changes only in the channel cross-sectional width in the vertical direction.
  • the vertical direction is the axial direction of the nozzle 111.
  • the tapered flow path 122f in which only the flow path cross-sectional width in the vertical direction changes, at least the connection end of the individual ink discharge path 121 with the pressure chamber 131 is perpendicular to the axial direction of the nozzle 111 (left-right direction).
  • the channel cross-sectional width 12g matches the width 131g of the pressure chamber 131 in the same direction (left-right direction).
  • the flow of ink from the pressure chamber 131 to the first individual ink discharge path 122 can be performed in the same direction (left-right direction) without reduction in the cross-sectional width of the flow path, so that bubbles, foreign matters, etc. in the pressure chamber 131 are discharged together with the ink.
  • Easy to be. It should be noted that modifications such as providing the tapered flow path 122f limited to the upstream end of the first individual ink discharge path 122 are possible.
  • the inlet of the individual ink discharge path 121 is narrowed as viewed from the pressure chamber 131, that is, the upstream minimum flow section of the enlarged flow path is connected to the pressure chamber 131.
  • the first individual ink discharge path 122 of the present embodiment is provided in the lower surface side portion of the flow path spacer substrate 12 adjacent to the nozzle substrate 11, it is not limited thereto.
  • the first individual ink discharge path 122 may be provided so as to straddle both the nozzle substrate 11 and the channel spacer substrate 12, or may be provided only on the nozzle substrate 11, or the bottom surface of the channel spacer substrate 12. It may be provided slightly above the nozzle substrate 11 so as not to be adjacent to the nozzle substrate 11.
  • a wiring board 2 is disposed on the upper surface of the head chip 1, and two flexible boards 3 connected to the drive circuit board 4 at both edges along the front-rear direction of the wiring board 2. Is arranged.
  • the wiring board 2 is formed in a substantially rectangular plate shape that is long in the left-right direction, and has an opening 22 at a substantially central portion thereof. Each width of the wiring substrate 2 in the left-right direction and the front-rear direction is formed larger than that of the head chip 1.
  • the opening 22 is formed in a substantially rectangular shape that is long in the left-right direction.
  • the opening 22 is shared with the inlet of each pressure chamber 131 in the head chip 1.
  • the outlet of the ink discharge path 135 is exposed to the upper side.
  • the flexible board 3 electrically connects the drive circuit board 4 and the electrode part of the wiring board 2, and a signal from the drive circuit board 4 is provided on the partition 136 in the head chip 1 via the flexible board 3.
  • the drive electrode can be applied.
  • the lower end portion of the manifold 5 is attached and fixed to the outer edge portion of the wiring board 2 by adhesion. That is, the manifold 5 is disposed on the inlet side (upper side) of the pressure chamber 131 of the head chip 1 and is connected to the head chip 1 via the wiring board 2.
  • the manifold 5 is a member formed of resin, is provided on the pressure chamber 131 of the head chip 1, and stores ink introduced into the pressure chamber 131. Specifically, as shown in FIG. 3B and the like, the manifold 5 is formed in an elongated shape in the left-right direction, and a hollow main body 52 that constitutes the ink reservoir 51 and a first that constitutes the ink flow path. 1 to 4th ink ports 53 to 56 are provided.
  • the ink reservoir 51 is divided into two parts, an upper first liquid chamber 51a and a lower second liquid chamber 51b, by a filter F for removing dust in the ink.
  • the first ink port 53 communicates with the upper right end portion of the first liquid chamber 51 a and is used for introducing ink into the ink storage portion 51.
  • a first joint 81 a is externally inserted at the tip of the first ink port 53.
  • the second ink port 54 communicates with the upper left end of the first liquid chamber 51a, and is used to remove bubbles in the first liquid chamber 51a.
  • a second joint 81 b is externally inserted at the tip of the second ink port 54.
  • the third ink port 55 communicates with the upper left end of the second liquid chamber 51b and is used to remove bubbles in the second liquid chamber 51b.
  • a third joint 82 a is externally inserted at the tip of the third ink port 55.
  • the fourth ink port 56 communicates with a discharge liquid chamber 57 that communicates with the second common ink discharge path 135 of the head chip 1, and the ink discharged from the head chip 1 passes through the fourth ink port 56 and is inkjet It is discharged outside the head 100.
  • the housing 6 is a member formed by a die-cast method using, for example, aluminum as a material, and is formed long in the left-right direction. Further, the housing 6 is formed so as to be able to accommodate a manifold 5 to which the head chip 1, the wiring substrate 2 and the flexible substrate 3 are attached, and the bottom surface of the housing 6 is opened. In addition, attachment holes 68 for attaching the housing 6 to the printer main body side are formed at both ends in the left-right direction of the housing 6.
  • the cap receiving plate 7 has a nozzle opening 71 elongated in the left-right direction at a substantially central portion thereof, and the nozzle substrate 11 is exposed through the nozzle opening 71 so that the housing 6 It is attached to close the bottom opening.
  • the ink circulation system 8 is ink supply means for generating a circulation flow of ink from the pressure chamber 131 in the inkjet head 100 to the individual ink discharge path 121.
  • the ink circulation system 8 includes a supply sub tank 81, a circulation sub tank 82, a main tank 83, and the like (FIG. 11).
  • the supply sub tank 81 is filled with ink to be supplied to the ink reservoir 51 of the manifold 5, and is connected to the first ink port 53 by an ink flow path 84.
  • the circulation sub tank 82 is filled with the ink discharged from the discharge liquid chamber 57 of the manifold 5, and is connected to the fourth ink port 56 by the ink flow path 85.
  • the supply sub-tank 81 and the circulation sub-tank 82 are provided at different positions in the vertical direction (gravity direction) with respect to the nozzle surface of the head chip 1 (hereinafter also referred to as “position reference surface”).
  • a pressure P1 due to a water head difference between the position reference surface and the supply sub tank 81 and a pressure P2 due to a water head difference between the position reference surface and the circulation sub tank 82 are generated.
  • the supply sub-tank 81 and the circulation sub-tank 82 are connected by an ink flow path 86. Ink can be returned from the circulation sub-tank 82 to the supply sub-tank 81 by the pressure applied by the pump 88.
  • the main tank 83 is filled with ink to be supplied to the supply sub-tank 81, and is connected to the supply sub-tank 81 by the ink flow path 87. Ink can be supplied from the main tank 83 to the supply sub-tank 81 by the pressure applied by the pump 89.
  • the pressure P1 and the pressure P2 can be adjusted by appropriately changing the ink filling amount in each sub tank and the position in the vertical direction (gravity direction) of each sub tank.
  • the ink in the inkjet head 100 can be circulated at an appropriate circulation flow rate by the pressure difference between the pressure P1 and the pressure P2. Thereby, bubbles, foreign matter, etc. generated in the head chip 1 can be removed, and clogging of the nozzle 111, injection failure, and the like can be suppressed.
  • the ink circulation system 8 the method for controlling the circulation of the ink by the water head difference has been described.
  • the configuration can be appropriately changed as long as the configuration can generate the ink circulation.
  • the present invention is not limited thereto.
  • the head chip 1 of the present embodiment an example in which the nozzle substrate 11, the flow path spacer substrate 12, and the pressure chamber substrate 13 are sequentially stacked is shown, but the present invention is not limited thereto, and the nozzle substrate 11 and the pressure chamber substrate 13 A two-layer structure may be used.
  • an individual ink discharge path 121 may be provided on at least one of the nozzle substrate 11 and the pressure chamber substrate 13.
  • the inkjet head 100 of the present embodiment it is only necessary to provide a means for applying pressure to the ink in the pressure chamber 131, and the present invention is not limited to this.
  • the ink in the second common ink discharge path 135 may be discharged without being circulated. It is good also as a structure which can select whether to discharge.
  • the present invention is not limited thereto.
  • it may be configured to open on any side surface of the head chip 1 in the front-rear and left-right directions, or may have a bent portion that changes the direction of ink flow in the middle of the flow path.
  • the present invention can be used for an inkjet head and an inkjet recording apparatus.
  • Ink circulation system (ink supply means) 11 Nozzle substrate 111 Nozzle 12 Flow path spacer substrate 121 Individual ink discharge path 122 First individual ink discharge path 123 Second individual ink discharge path 13 Pressure chamber substrate 131 Pressure chamber 132 Air chamber 133 Common ink discharge path 134 First common ink discharge Path 135 Second common ink discharge path 136 Partition (pressure generating means) 100 Inkjet head 200 Inkjet recording apparatus

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

L'invention concerne la sécurisation d'un débit d'évacuation d'encre à partir de chambres de pression et la suppression de l'échappement d'ondes de pression de chambres de pression vers des voies individuelles d'évacuation d'encre, grâce à une tête à jet d'encre (100) pourvue de multiples buses (111), de multiples chambres de pression (131), d'un moyen de production de pression (la paroi de séparation (136)), de multiples voies individuelles d'évacuation d'encre (121), qui se ramifient à partir de chacune des multiples chambres de pression (131) et qui sont à même d'évacuer l'encre dans les multiples chambres de pression (131) et d'une voie commune d'évacuation d'encre (133) à laquelle sont liées les multiples voies individuelles d'évacuation d'encre (121), les voies individuelles d'évacuation d'encre (121) comprenant une voie d'écoulement de diamètre croissant (122a, 122b) dans laquelle la surface de section transversale de voie d'écoulement augmente dans la direction allant des chambres de pression (131) à la voie commune d'évacuation d'encre (133).
PCT/JP2018/020281 2017-06-09 2018-05-28 Tête à jet d'encre et dispositif d'impression à jet d'encre WO2018225551A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019523457A JP7047840B2 (ja) 2017-06-09 2018-05-28 インクジェットヘッド及びインクジェット記録装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017113968 2017-06-09
JP2017-113968 2017-06-09

Publications (1)

Publication Number Publication Date
WO2018225551A1 true WO2018225551A1 (fr) 2018-12-13

Family

ID=64567296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/020281 WO2018225551A1 (fr) 2017-06-09 2018-05-28 Tête à jet d'encre et dispositif d'impression à jet d'encre

Country Status (2)

Country Link
JP (1) JP7047840B2 (fr)
WO (1) WO2018225551A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7415499B2 (ja) 2019-12-04 2024-01-17 ブラザー工業株式会社 液体吐出ヘッド

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011520671A (ja) * 2008-05-23 2011-07-21 富士フイルム株式会社 流体液滴吐出
US20120293592A1 (en) * 2011-05-16 2012-11-22 Silverbrook Research Pty Ltd Ink distribution system having gas venting
JP2014054828A (ja) * 2012-09-11 2014-03-27 Samsung Electro-Mechanics Co Ltd インクジェットプリントヘッド
JP2016010862A (ja) * 2014-06-27 2016-01-21 パナソニックＩｐマネジメント株式会社 インクジェットヘッド及びそれを具備するインクジェット装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06143571A (ja) * 1992-11-02 1994-05-24 Fuji Electric Co Ltd インクジェット記録ヘッド
JP5495385B2 (ja) * 2010-06-30 2014-05-21 富士フイルム株式会社 液滴吐出ヘッド
JP5302378B2 (ja) 2011-01-14 2013-10-02 パナソニック株式会社 インクジェットヘッド

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011520671A (ja) * 2008-05-23 2011-07-21 富士フイルム株式会社 流体液滴吐出
US20120293592A1 (en) * 2011-05-16 2012-11-22 Silverbrook Research Pty Ltd Ink distribution system having gas venting
JP2014054828A (ja) * 2012-09-11 2014-03-27 Samsung Electro-Mechanics Co Ltd インクジェットプリントヘッド
JP2016010862A (ja) * 2014-06-27 2016-01-21 パナソニックＩｐマネジメント株式会社 インクジェットヘッド及びそれを具備するインクジェット装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7415499B2 (ja) 2019-12-04 2024-01-17 ブラザー工業株式会社 液体吐出ヘッド

Also Published As

Publication number Publication date
JP7047840B2 (ja) 2022-04-05
JPWO2018225551A1 (ja) 2020-04-09

Similar Documents

Publication Publication Date Title
JP7031687B2 (ja) インクジェットヘッド及びインクジェット記録装置
CN109414933B (zh) 喷墨记录装置
JP6962013B2 (ja) インクジェットヘッド及びインクジェット記録装置
JP5359915B2 (ja) 液滴吐出装置、及び、液滴吐出ヘッド
CN107825850B (zh) 喷墨头、喷墨记录装置以及喷墨头的制造方法
WO2018225553A1 (fr) Tête à jet d'encre et dispositif d'impression à jet d'encre
WO2018225551A1 (fr) Tête à jet d'encre et dispositif d'impression à jet d'encre
JP2022010200A (ja) インクジェットヘッドおよび画像形成装置
JP7019973B2 (ja) インクジェットヘッド及びインクジェット記録装置
JP5832272B2 (ja) 液体吐出ヘッド
JP2016055545A (ja) 液体噴射ヘッド及び液体噴射装置
WO2017169681A1 (fr) Tête à jet d'encre et appareil d'enregistrement à jet d'encre
JP7255297B2 (ja) 液体吐出ヘッド
JP7292876B2 (ja) 液体吐出ヘッドおよび液体吐出装置
JP7263888B2 (ja) 液体吐出装置、及びこれを備える画像記録装置
JP7392290B2 (ja) 吐出ヘッド
JP2016199032A (ja) 液体吐出ヘッド、液体吐出ユニット及び液体を吐出する装置
JP5045768B2 (ja) 液滴吐出ヘッド
JP2007001184A (ja) 液体吐出ヘッド及び画像形成装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18813538

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019523457

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18813538

Country of ref document: EP

Kind code of ref document: A1