WO2015129544A1 - インクジェット記録装置 - Google Patents
インクジェット記録装置 Download PDFInfo
- Publication number
- WO2015129544A1 WO2015129544A1 PCT/JP2015/054605 JP2015054605W WO2015129544A1 WO 2015129544 A1 WO2015129544 A1 WO 2015129544A1 JP 2015054605 W JP2015054605 W JP 2015054605W WO 2015129544 A1 WO2015129544 A1 WO 2015129544A1
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- WO
- WIPO (PCT)
- Prior art keywords
- nozzle
- width direction
- head
- nozzle openings
- recording apparatus
- Prior art date
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Classifications
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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
- B41J2/135—Nozzles
- B41J2/145—Arrangement thereof
- B41J2/155—Arrangement thereof for line printing
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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
- B41J2/135—Nozzles
- B41J2/145—Arrangement thereof
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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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
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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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
- B41J25/003—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for changing the angle between a print element array axis and the printing line, e.g. for dot density changes
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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
- 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
- This invention relates to an ink jet recording apparatus.
- an ink jet recording apparatus that forms an image on a recording medium by ejecting ink from a plurality of nozzle openings.
- the ink jet recording apparatus as the formed image is highly accurate, more nozzle openings are arranged with high density.
- a plurality of ink jet heads are provided in parallel so as to form a wide range of images at a time in order to speed up image formation. Further, if the interval in the width direction of the nozzle openings is reduced with the increase in accuracy, it becomes difficult to arrange the nozzle openings in a single row, so the nozzle openings are arranged in a plurality of rows in the transport direction. Thus, a technique of providing nozzle openings at high density in the width direction as a whole is used.
- Patent Document 1 discloses a technique in which a plurality of print head subunits (head chips, recording heads) are attached to a structural bar in a staggered pattern so that a plurality of inkjet heads do not occupy a large space.
- the head units arranged in a staggered pattern are formed in a substantially trapezoidal shape and are alternately arranged, thereby reducing the width in the transport direction to the recording medium.
- the positional accuracy includes relative positional accuracy among a plurality of inkjet heads. Therefore, in recent years, there is a technique for precisely attaching a head chip of an inkjet head to a head module using an optical major scope or the like.
- this positional deviation includes not only the positional deviation in the parallel direction but also the positional deviation in the rotational direction.
- the magnitude and direction of the deviation differ depending on the relative position of each nozzle opening from the rotation axis, so the width between adjacent nozzle openings may be reduced (overlapping) depending on the position in the recording head. Or) will spread.
- the print heads are individually attached to the mounting member, or when the nozzles are arranged in a plurality of rows in the transport direction along with the conventional print heads in a staggered arrangement, etc. There is a problem that the image quality deteriorates due to a relatively large displacement in the width direction with respect to the rotation angle of the displacement.
- An object of the present invention is to provide an ink jet recording apparatus that can prevent positional displacement in the rotational direction and image quality deterioration due to this positional displacement with an easy configuration.
- the invention according to claim 1
- a plurality of head modules in which a plurality of recording heads each having a plurality of nozzle openings provided in a predetermined pattern arrangement on the nozzle surface are fixed in a one-dimensional array,
- Each of the plurality of head modules is attached to the attachment member at both ends in the width direction so that the plurality of recording heads are arranged in a width direction perpendicular to the conveyance direction of the recording medium,
- An ink jet recording apparatus wherein an image is formed on a recording medium by ejecting ink from the nozzle opening.
- the invention described in claim 2 is the ink jet recording apparatus according to claim 1,
- the plurality of head modules are:
- the recording heads are arranged in parallel so as to be arranged in a staggered pattern at at least two positions different in the transport direction.
- the invention described in claim 3 is the ink jet recording apparatus according to claim 2, A transport unit that transports the recording medium on the transport surface having a curvature in the transport direction while facing the nozzle surface;
- Each of the plurality of head modules is arranged such that the nozzle surface is perpendicular to a perpendicular line from the center of the nozzle surface in the transport direction to the transport surface.
- the invention according to claim 4 is the ink jet recording apparatus according to claim 2 or 3,
- the plurality of head modules arranged in parallel in the transport direction have a concavo-convex shape in the width direction on each side surface adjacent to each other, and the concavo-convex shape has a convex portion on one side surface and a concave portion on the other side surface. It is characterized by the fact that they are arranged opposite to each other.
- the invention according to claim 5 is the ink jet recording apparatus according to claim 2 or 3,
- the plurality of head modules arranged in parallel in the transport direction are characterized in that each of the head modules is formed to have a smaller thickness than the other part over a predetermined length from the side surfaces adjacent to each other.
- the invention according to claim 6 is the ink jet recording apparatus according to any one of claims 1 to 5,
- the plurality of nozzle openings provided on the nozzle surface are two-dimensionally arranged in each of the recording heads, and the formation area of the plurality of nozzle openings arranged two-dimensionally is two or more in the transport direction.
- the plurality of nozzle openings that are equally divided into a predetermined number of nozzle blocks and that are provided in each of the nozzle blocks have predetermined width intervals between adjacent nozzle openings that are adjacent in the width direction.
- the nozzle openings provided in the first predetermined number of nozzle blocks are shifted by a second interval obtained by dividing the first interval by the first predetermined number in the width direction. It is characterized by being arranged.
- the invention according to claim 7 is the ink jet recording apparatus according to claim 6,
- the first predetermined number is 4 or more; Adjacent nozzle blocks to which the nozzle openings arranged in the width direction from the nozzle openings belonging to the one nozzle block belong in the width direction are more than the first predetermined number in the transport direction from the one nozzle block.
- the first predetermined number of the nozzle blocks are arranged so as to be separated from each other within a number of a second predetermined number of nozzle blocks smaller than two.
- the invention according to claim 8 is the ink jet recording apparatus according to claim 6 or 7,
- the first predetermined number is four;
- the first interval is characterized in that the nozzle openings are wide enough to be arranged 300 per inch.
- the invention according to claim 9 is the ink jet recording apparatus according to any one of claims 6 to 8,
- the plurality of nozzle openings belonging to each of the nozzle blocks has a number of rows obtained by dividing the third interval by the first interval by the nozzle row by the nozzle openings arranged in the width direction at a predetermined third interval.
- the nozzle openings in each of the nozzle rows are arranged so as to be shifted from each other by the first interval.
- the ink jet recording apparatus there is an effect that it is possible to prevent the positional deviation in the rotation direction and the deterioration of the image due to the positional deviation with an easy configuration.
- FIG. 4 is a perspective view showing a positional relationship between an image forming drum and a cleaning unit and positions before and after movement of a head unit. It is a bottom view which shows the surface facing the recording medium of a nozzle unit. It is a figure explaining the arrangement
- FIG. 10 is a bottom view showing a head module according to Modification 2.
- FIG. 10 is a side view showing a head module of a second modification.
- FIG. 10 is a side view showing a head module of Modification 3;
- FIG. 10 is a side view showing a head module of a fourth modification.
- FIG. 1 is a schematic diagram showing an overall configuration of an inkjet recording apparatus 1 according to an embodiment of the present invention.
- the inkjet recording apparatus 1 includes a transport unit 10, an image forming unit 20, a control unit 40, an ink supply unit 50, and the like.
- an image is formed by the ink supplied from the ink supply unit 50 on the recording medium P conveyed to the position facing the image forming unit 20 by the conveying unit 10 based on the control of the control unit 40. After the image is formed by the unit 20, the recording medium P is discharged.
- the transport unit 10 holds the recording medium P on which image formation is performed, transports the recording medium P so as to face the image forming unit 20, and discharges the recording medium P on which the image is formed.
- the transport unit 10 includes an image forming drum 11.
- the image forming drum 11 carries the recording medium P along the cylindrical outer peripheral surface, and conveys the recording medium P as it rotates.
- the outer peripheral surface (conveying surface) of the image forming drum 11 faces the head unit 21 and performs processing related to image formation on the recording medium P being conveyed.
- the image forming unit 20 forms an image by ejecting ink onto the recording medium P.
- the image forming unit 20 includes a head unit 21 and a cleaning unit 22.
- the head unit 21 discharges ink to the recording medium P carried on the image forming drum 11 to form an image.
- the head unit 21 is provided for each color of C (cyan), M (magenta), Y (yellow), and K (black).
- head units 21 corresponding to the respective colors Y, M, C, and K are provided in order from the upstream in the conveyance direction of the recording medium P that is conveyed along with the rotation of the image forming drum 11.
- the head unit 21 of the present embodiment is provided with a length (width) that covers the entire recording medium P in a direction (width direction) perpendicular to the conveyance direction of the recording medium P. That is, the ink jet recording apparatus 1 is a one-pass line head type ink jet recording apparatus.
- the head unit 21 is formed by arranging and fixing a plurality of nozzle units in which a common ink chamber and a recording head 2811 (head chip, see FIG. 3) are joined and fixed to an attachment member 28 (carriage, see FIG. 3). At the time of image formation, it is arranged to face the recording medium P.
- the surface (bottom surface) facing the recording medium P of the recording head 2811 is a nozzle surface in which a plurality of nozzle openings for discharging ink are arranged in a predetermined pattern.
- FIG. 2 is a perspective view showing the positional relationship between the image forming drum 10 and the cleaning unit 22 and the position before and after the head unit 21 moves.
- the head unit 21 is movable in the direction (Y direction) perpendicular to the conveyance direction of the recording medium P, that is, the movement direction of the outer peripheral surface related to the rotation of the image forming drum 11 in accordance with the movement operation of the mounting member 28. Is provided.
- the cleaning unit 22 for removing dirt on the nozzle surface is arranged in parallel with the image forming drum 11 in the Y direction, and the head unit 21 faces the image forming drum 11 under the control of the control unit 40. A reciprocating movement is possible between the position and a position facing the cleaning unit 22.
- the control unit 40 controls the operation of each unit of the inkjet recording apparatus 1 and controls the overall operation.
- the control unit 40 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.
- the program read from the ROM by the CPU is executed on the RAM, and various control processes are executed.
- the ink supply unit 50 includes an ink tank and a pump, and supplies ink to be ejected from the nozzle opening to the head unit 21.
- FIG. 3 is a bottom view showing the nozzle surface facing the recording medium P of the head unit 21.
- the head unit 21 is provided with a head module 281 formed integrally by arranging three recording heads 2811 (nozzle units) in a one-dimensional direction (on a straight line).
- the head module 281 is mounted and fixed to the mounting member 28 in an arrangement extending in the width direction, and provided in two rows in parallel in the transport direction, so that the recording heads 2811 are arranged in a staggered pattern as a whole. Screws, bolts, springs, and the like are used to attach the head module 281 to the attachment member 28, and minute positional deviation is likely to occur.
- the common ink chamber, wiring, driving unit for example, FPC
- FPC driving unit
- the recording head 2811 includes, for example, a flow path substrate provided with a flow path for ink, a piezoelectric element and a diaphragm as an operation mechanism for moving and discharging ink in the flow path, and the piezoelectric element.
- a circuit board, an interposer, and the like for driving are laminated and formed using a MEMS (Micro Electro Mechanical Systems) technology.
- the head module 281 is obtained by integrally forming and fixing a plurality of recording heads 2811 using silicon resin or the like. When the head module 281 is formed, the recording head 2811 is accurately positioned and bonded while performing image processing using an optical measure scope or the like. Alternatively, a plurality of recording heads 2811 and head modules 281 may be integrally formed from the beginning. Thereby, the relative positional deviation of each nozzle in the head module 281 is suppressed sufficiently small with respect to the resolution of the nozzle.
- the mounting member 28 is made of a material that is unlikely to be distorted or deformed by the weight of the head module 281 or heat during operation, for example, a metal member such as an aluminum alloy.
- the head module 281 only needs to appropriately fix the position of the recording head 2811, and the common ink chamber joined to the recording head 2811 protrudes from the surface (upper surface) opposite to the nozzle surface side in the head module 281. It is good. In this case, the housing in which the wiring and driving unit connected to the common ink chamber and interposer are stored is joined to the head module 281.
- the nozzle surface of each recording head 2811 has a substantially square shape, for example, a 30 mm square shape, and is provided with nozzle openings of 32 rows ⁇ 32 columns (nozzle rows). Yes.
- FIG. 4 is a diagram illustrating the arrangement of nozzles on the nozzle surface.
- the plurality of nozzle openings are two-dimensionally arranged in 32 rows in the width direction (Y direction) (only a part is shown in FIG. 4) and 32 columns in the transport direction (X direction).
- nozzle openings are provided at intervals (third interval) 32 times the interval d1 between the nozzle openings in adjacent rows.
- eight nozzle openings in each row are divided into four (first predetermined number) blocks B1 to B4 (nozzle blocks), and each block has a gap d2 between adjacent nozzle openings. Is provided.
- the nozzle openings of each block are arranged so as to be shifted in the width direction by a length (first interval) that is four times the interval d1.
- the nozzle openings of the four blocks are arranged so as to be shifted from each other by a distance d1 (second distance) in the width direction.
- the nozzle opening of block B1 and the nozzle opening of block B2 are arranged with a gap d1 in the width direction
- the nozzle opening of block B2 and the nozzle opening of block B4 are arranged with a gap d1 in the width direction.
- the nozzle opening of the block B4 and the nozzle opening of the block B3 are arranged with a gap d1 in the width direction.
- the distance between the adjacent nozzle openings is within two blocks (second predetermined number) at a time and does not change significantly.
- the block order satisfying such conditions is not limited to the above.
- FIG. 5 is a diagram for explaining a rotational position shift related to the mounting of the head module 281.
- the position of each nozzle opening also undergoes rotational deviation.
- the displacement direction of the nozzle opening varies depending on the positional relationship between the rotation shaft and each nozzle opening. That is, as the nozzle opening is farther from the rotation axis, the magnitude of the deviation increases, and the nozzle opening in the width direction with respect to the rotation axis is displaced in the conveyance direction, and in the conveyance direction relative to the rotation axis. Some nozzle openings are displaced in the width direction. Therefore, if there is this rotational deviation, the positional relationship between the ink landing positions on the recording medium P from the nozzle openings changes.
- the nozzle opening is provided in a range of about 21.6 mm square.
- the rotation angle ⁇ is about 0.04 degrees.
- the nozzle openings adjacent to each other in the width direction are offset by 16 ⁇ d2 by a maximum of two blocks in the transport direction, and accordingly, a distance deviation ⁇ d1 in the width direction is caused by about 8 ⁇ m at the maximum. become. That is, the distance in the width direction between adjacent nozzle openings is shifted by 1/3 or more of the original interval due to the rotational deviation of the minute rotation angle ⁇ .
- deviations in the width direction are difficult to be corrected by correction techniques such as ink ejection timing and ejection speed, deviations in the nozzle opening interval are likely to cause image deterioration, for example, color unevenness and streaks occur. .
- a plurality of (here, three) recording heads 2811 are integrally provided in the head module 281 in the width direction. Accordingly, the length of the head module 281 in the width direction is three times or more that of the recording head 2811.
- the rotational angle ⁇ of the rotational shift accompanying the positional shift is less than 1/3, that is, the shift amount related to the interval in the width direction of the nozzle openings is reduced.
- FIG. 6A and 6B are perspective views for explaining the mounting arrangement of the plurality of head modules 281 to the mounting member 28.
- FIG. 6A and 6B are perspective views for explaining the mounting arrangement of the plurality of head modules 281 to the mounting member 28.
- FIG. 6A is a view of the arrangement when the head module 281 is attached to the attachment member 28 in the inkjet recording apparatus 1 of the present embodiment, as viewed from the ink ejection surface side of the head module 281.
- two head modules 281 extending in the Y direction (width direction) are arranged in parallel in the X direction (conveyance direction) and attached to the attachment member 28. At this time, the nozzle surfaces of the two head modules 281 are not in the same plane but are inclined with respect to each other.
- FIG. 7 is a diagram illustrating the relative angles of the nozzle surfaces of the two head modules 281.
- FIG. 7 shows a side view of the image forming drum 11 viewed from the side of the extending direction of the rotation shaft.
- Each of the two head modules 281 includes a vertical surface that is lowered perpendicularly to the outer peripheral surface (conveying surface) of the image forming drum 11 from the center line (lines C1 and C2 in FIG. 6A) of the nozzle surface in the conveying direction. These are attached to the attachment member 28 so that the nozzle surface is at a right angle.
- the recording medium P on the outer peripheral surface is curved and arranged in an arc shape, so that ink is simultaneously ejected from a plurality of nozzle openings at different positions in the transport direction. In this case, there arises a problem that the distance from the nozzle opening to the recording medium P varies depending on the position in the transport direction.
- the installation angles of the nozzle surfaces of the different head modules 281 are individually determined with respect to the outer peripheral surface, thereby suppressing a difference in distance from the nozzle opening to the recording medium P.
- the attachment member 28 may be provided separately for each head module 281 that differs in the transport direction, or the head module 281 may be attached at a different angle with respect to the single attachment member 28.
- 8A to 8C are views for explaining attachment to the attachment member when the plurality of head modules 281 are arranged in the width direction.
- a line head type ink jet recording apparatus like the ink jet recording apparatus 1 of the present embodiment, it is usually necessary to arrange more recording heads 2811 in the width direction.
- all the recording heads 2811 arranged in the width direction are fixed to the same head module 281, and the head module 281 is attached to the attachment member 28.
- the resin head module 281 is extended long, the strength decreases, and as a result, it may cause a positional shift. Therefore, in this case, it is preferable to use a structure or member that increases the strength of the head module 281.
- a plurality of head modules 281 are arranged in the width direction and attached to the same attachment member 28 without increasing the number of recording heads 2811 provided in one head module 281. Can be used. In this case, the above-described strength problem is unlikely to occur, but it takes time to adjust the relative mounting position shift of the plurality of head modules 281 with respect to the mounting member 28.
- FIG. 8C it is possible to use a structure in which a plurality of head modules 281 are arranged in the width direction and these head modules are attached to separate attachment members 28, respectively.
- the movement distance of the attachment member 28 can be shortened by moving the attachment member 28 to both sides of the image forming drum 11.
- the length of the attachment member 28 can be shortened, the influence of the distortion of the attachment member 28 etc. can be suppressed.
- the relative positioning when the mounting member 28 that is a movable portion is disposed to face the recording medium P needs to be strictly performed.
- FIG. 6B shows a first modification of the head module.
- the head module 281a of the first modification is shown in a view of the head module 281a as viewed from the surface opposite to the nozzle surface.
- the head module 281a is formed by individually positioning recording heads 2811a that are individually positioned and fixed to a fixing member. Even during this fixing, precise alignment can be performed using the major scope and image processing, and therefore, the positional deviation between the nozzles in the head module 281a can be suppressed sufficiently small with respect to the resolution.
- the fixing member of the head module 281a is preferably a metal (alloy) member that is less likely to be distorted or deformed by the weight of the recording head 2811a or the force applied during mounting.
- FIGS. 9A and 9B are diagrams showing a head module 281b of a second modification. As shown in the bottom view of FIG. 9A, three recording heads 2811 are integrally provided in the head module 281b of the second modification.
- the head module 281 b is arranged to extend in the Y direction, and two head modules 281 b provided in parallel to the X direction are fixed to the mounting member 28.
- the two head modules 281b are formed with a concavo-convex shape in which side surfaces adjacent to each other extend in the width direction, and one convex portion is arranged to face the other concave portion. .
- the nozzle surfaces do not interfere with each other. There is no need to unnecessarily increase the distance between the head modules 281b.
- corrugated shape is not restricted to what was shown to FIG. 9A and FIG. 9B, It can change suitably. That is, the width, number, and size of the convex portions are set as appropriate.
- FIG. 10A is a side view of the head module 281c of Modification 3 as seen in the XZ plane.
- FIG. 10B is a side view of the head module 281d of Modification 4 as seen in the XZ plane.
- the head module 281c of Modification 3 has a thickness direction (substantially Z-axis direction) over a predetermined length on two side surfaces adjacent to each other in parallel in the transport direction (X direction). ) At different positions than the other parts. Thereby, even if it forms so that the angle which each nozzle surface of the two head modules 281c makes may be less than 180 degree
- the mounting member 28c corresponding to the head module 281c of Modification 3 is formed separately for each of the two head modules 281c, so that the head module 281c and the mounting member 28c come into contact with each other. Is preventing.
- the head module 281d of Modification 4 has its side surface inclined so that the angle formed by the two nozzle surfaces facing each other provided in parallel in the transport direction (X direction) becomes an obtuse angle. Is formed. That is, the head module 281d is formed so that the thickness on the side surface side is thinner than the other part over a predetermined length, and the area on the nozzle surface side is smaller than the area on the opposite side. As a result, even if the nozzle surfaces of the two head modules 281d are arranged to have an angle of less than 180 degrees, they do not interfere with each other.
- the side surfaces can be brought into contact with each other and fixed by appropriately adjusting the size of the obtuse angle formed by the nozzle surface and the above-described side surface and the size of the angle formed by each nozzle surface.
- the inkjet recording apparatus 1 includes a plurality of head modules 281 in which three recording heads 2811 each having a plurality of nozzle openings provided in a predetermined pattern arrangement on the nozzle surface are arranged and fixed in a one-dimensional manner.
- the plurality of head modules 281 have both end portions in the width direction (Y direction) such that the recording heads 2811 are arranged in the width direction (Y direction) perpendicular to the conveyance direction (X direction) of the recording medium P. Then, the ink is attached to the attachment member 28, and an image is formed on the recording medium by ejecting ink from the nozzle opening.
- the head module 281 is formed in the recording head unit so as to be long in the width direction and as short as possible in the transport direction, so that even when the head module 281 is attached to the attachment member 28, a positional deviation occurs in the rotation direction.
- the rotation angle due to the positional deviation can be suppressed to be smaller than the conventional one. Accordingly, it is possible to more easily prevent the arrangement of the nozzle openings from being disturbed due to the rotational deviation, and as a result, it is possible to suppress the deterioration of the image.
- the nozzle openings are arranged at high density.
- the plurality of head modules 281 arranged in parallel in the conveying direction are arranged so as to be as parallel as possible to the recording medium P. Is done.
- the recording medium P on the image forming drum 11 is curved, so that there is a difference in distance from the nozzle openings to the recording medium P.
- the recording head 2811 at different positions in the transport direction is included in the separate head module 281 and attached to the attachment member 28 as in the present invention, so that the appropriate position can be easily obtained.
- the recording head 2811 can be arranged at an angle and an angle, and the difference in the distance from the nozzle opening to the recording medium P can be suppressed to be small, and the deterioration of the image can be suppressed.
- the side surfaces adjacent to each other are formed so as to have an uneven shape in the width direction, and the convex portion on one side surface is disposed opposite to the concave portion on the other side surface.
- the distance between the head modules 281 can be arranged closer to the transport direction than a simple rectangular parallelepiped.
- the side surfaces adjacent to each other are each formed with a predetermined length and thinner than the other portions, so that the nozzle surfaces are arranged relative to each other. Since the nozzle surfaces do not interfere with each other when tilted, the distance between the head modules 281 can be closer to the transport direction than a simple rectangular parallelepiped.
- the plurality of nozzle openings are two-dimensionally arranged in each of the recording heads 2811 and are equally divided into four blocks B1 to B4 in the transport direction.
- the plurality of nozzle openings provided in each of the blocks B1 to B4 are provided so that the distance in the width direction between adjacent nozzle openings adjacent in the width direction is a distance d1 ⁇ 4.
- the nozzle openings provided in each of the blocks B1 to B4 are arranged so as to be shifted in the width direction by an interval obtained by dividing the interval d1 ⁇ 4 by 4 that is the number of blocks, that is, the interval d1.
- the block to which the nozzle opening portion arranged with a gap d1 in the width direction from the nozzle opening portion belonging to one block is moved in the transport direction from the one block.
- the divided blocks are arranged in order so that the blocks are separated within a block.
- each block has a shape in which 300 nozzle openings per inch are arranged as in a conventional ink jet recording apparatus.
- a high-precision recording head 2811 in which 1200 nozzle openings are arranged per inch can be obtained. Therefore, a highly accurate image can be easily formed.
- the plurality of nozzle openings belonging to each block are arranged in a pattern in which eight nozzle rows arranged in the width direction at intervals d1 ⁇ 32 are shifted from each other by intervals d1 ⁇ 4.
- the recording head 2811 capable of forming a high-resolution image can be formed more easily.
- the present invention is not limited to the above-described embodiment, and various modifications can be made.
- the inkjet recording apparatus 1 has been described as a line head. However, if a plurality of head modules in which a plurality of recording heads are arranged in the width direction are provided, the entire image forming width is covered. It may be a scanning type that is not formed.
- the head module 281 is described as being fixed at both ends in the width direction. However, the both ends are within a range that does not interfere with the arrangement of the nozzle openings and the recording head 2811. However, it is not necessary to strictly be within a predetermined distance from both side surfaces, as long as it is a position far from the center rather than being directly attached to the attachment member 28 alone. Further, it may be a position shifted from the center in the transport direction. However, the closer to both side surfaces, the more effectively the influence of rotational deviation can be suppressed. Further, the number of fixed locations is not limited to two. For example, even when the head module 281 is fixed to the mounting member 28 at four locations, rotational deviation may occur according to the relative positional deviation thereof.
- the recording medium P is transported along the outer peripheral surface of the image forming drum 11
- the recording medium P is transported on a plane. It may be a form.
- the head modules 281 provided at different positions in the transport direction are all disposed opposite the transport surface at the same angle.
- the configuration in which the recording medium P is curved and conveyed is not limited to the outer peripheral surface of the cylindrical image forming drum, and may be, for example, a semi-cylindrical inner peripheral surface (concave surface) or an elliptical cylindrical shape. good.
- the nozzle openings are two-dimensionally arranged on the nozzle surface of each recording head 2811 .
- the effect of the present invention is achieved. can get.
- the number of nozzle openings arranged in the transport direction and the width direction can be set as appropriate.
- the nozzle opening is divided into four blocks and arranged in an appropriate positional relationship with each other.
- the recording head 2811 may not be divided.
- the number of blocks to be divided is not limited to four. When the number of blocks is 4 or more, the nozzle arrangement of each block is determined so that the amount of movement in the transport direction of the block to which the nozzle opening adjacent in the width direction belongs is within 2 blocks regardless of the number of blocks. I can do it.
- nozzle arrangement in each block is not limited to the case where the nozzles are sequentially shifted in the transport direction as shown in the above embodiment, and the order may be changed.
- specific details such as the configuration, structure, arrangement, and shape shown in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.
- the present invention can be used in an ink jet recording apparatus having a plurality of recording heads.
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Abstract
Description
ノズル面に複数のノズル開口部が所定のパターン配置で設けられた記録ヘッドを複数個一次元配列して固定したヘッドモジュールを複数備え、
当該複数のヘッドモジュールは、それぞれ、記録媒体の搬送方向に垂直な幅方向に前記複数個の記録ヘッドが配列されるように前記幅方向の両端部で取付部材に取り付けられ、
前記ノズル開口部からインクを吐出させることで記録媒体に画像を形成する
ことを特徴とするインクジェット記録装置である。
前記複数のヘッドモジュールは、
前記搬送方向に異なる少なくとも2つの位置に、前記記録ヘッドが千鳥格子状に配列されるように並列配置されている
ことを特徴としている。
搬送方向に曲率を有する搬送面上の記録媒体を、前記ノズル面と対向させながら搬送する搬送部を備え、
前記複数のヘッドモジュールは、それぞれ、前記ノズル面が当該ノズル面の搬送方向への中央から前記搬送面への垂線と垂直になるように配置されている
ことを特徴としている。
前記搬送方向に並列配置された前記複数のヘッドモジュールは、互いに隣接する側面にそれぞれ前記幅方向に凹凸形状を有し、当該凹凸形状は、一方の前記側面における凸部が他方の前記側面における凹部と対向配置されている
ことを特徴としている。
前記搬送方向に並列配置された前記複数のヘッドモジュールは、互いに隣接する側面から各々所定の長さに亘り厚みが他の部分より薄く形成されて相対配置されている
ことを特徴としている。
前記ノズル面に設けられた前記複数のノズル開口部は、前記記録ヘッドの各々で二次元配列され、当該二次元配列された前記複数のノズル開口部の形成領域は、搬送方向に2以上の第1所定数のノズルブロックに等分され、前記ノズルブロックの各々に設けられた複数の前記ノズル開口部は、幅方向の位置が隣り合う隣接ノズル開口部との当該幅方向の間隔が所定の第1間隔となるように設けられ、前記第1所定数のノズルブロックに各々設けられた前記ノズル開口部は、互いに幅方向に前記第1間隔を前記第1所定数で除した第2間隔ずつずらして配置されていることを特徴としている。
前記第1所定数は4以上であり、
一の前記ノズルブロックに属する前記ノズル開口部から幅方向に前記第2間隔ずれて配置された前記ノズル開口部の属する隣接ノズルブロックが、前記一のノズルブロックから搬送方向に前記第1所定数より2以上小さい第2所定数のノズルブロック数以内で離隔した前記ノズルブロックであるように前記第1所定数の前記ノズルブロックが配置されていることを特徴としている。
前記第1所定数は4であり、
前記第1間隔は、前記ノズル開口部が1インチ当たり300個配置される幅である
ことを特徴としている。
前記ノズルブロックのそれぞれに属する複数の前記ノズル開口部は、所定の第3間隔で幅方向に配列された前記ノズル開口部によるノズル列が前記第3間隔を前記第1間隔で除した列数に亘り前記搬送方向に配列されたパターンで設けられ、当該ノズル列の各々におけるノズル開口部は、互いに前記第1間隔ずつずらして配置されていることを特徴としている。
図1は、本発明の実施形態のインクジェット記録装置1の全体構成を示す模式図である。
本実施形態のヘッドユニット21は、記録媒体Pの搬送方向に垂直な方向(幅方向)について記録媒体Pの全体をカバーする長さ(幅)で設けられている。即ち、インクジェット記録装置1は、ワンパス方式のラインヘッド型インクジェット記録装置である。
ヘッドユニット21は、共通インク室と記録ヘッド2811(ヘッドチップ、図3参照)とが接合されたノズルユニットが複数配列されて取付部材28(キャリッジ、図3参照)に取付固定されて形成され、画像形成時には、記録媒体Pと対向して配置される。記録ヘッド2811の記録媒体Pと対向する面(底面)は、インクを吐出させるための複数のノズル開口部が所定のパターンで配列されて設けられたノズル面となっている。
ヘッドユニット21は、取付部材28の移動動作に伴って記録媒体Pの搬送方向、即ち、画像形成ドラム11の回転に係る外周面の移動方向に対して垂直な方向(Y方向)に移動可能に設けられている。ノズル面の汚れを除去するためのクリーニング部22は、画像形成ドラム11とY方向に並列に配置されており、ヘッドユニット21は、制御部40の制御に基づいて、画像形成ドラム11に対向する位置と、クリーニング部22に対向する位置との間で往復移動が可能となっている。
インク供給部50は、インクタンク及びポンプを備え、ノズル開口部から吐出させるインクをヘッドユニット21に供給する。
図3は、ヘッドユニット21の記録媒体Pと対向するノズル面を示す底面図である。
ノズル面において、複数個のノズル開口部は、幅方向(Y方向)に32行(図4では一部のみ表示)、搬送方向(X方向)に32列の二次元配列されている。幅方向へは、それぞれ隣接する行のノズル開口部と間隔d1の32倍の間隔(第3間隔)でノズル開口部が設けられている。一方、搬送方向へは、各行のノズル開口部が8個ずつ4つ(第1所定数)のブロックB1~B4(ノズルブロック)に分けられて、各ブロックにおいて隣接するノズル開口部と間隔d2で設けられている。また、各ブロックのノズル開口部は、互いに幅方向に間隔d1の4倍の長さ(第1間隔)ずれて配置されている。4つのブロックのノズル開口部は、それぞれ、互いに幅方向に間隔d1(第2間隔)ずつずれて配置されている。ブロックB1のノズル開口部とブロックB2のノズル開口部とは、幅方向に間隔d1ずれて配置され、ブロックB2のノズル開口部とブロックB4のノズル開口部とは、幅方向に間隔d1ずれて配置され、更に、ブロックB4のノズル開口部とブロックB3のノズル開口部とは、幅方向に間隔d1ずれて配置されている。このノズル面に対して記録媒体Pが搬送方向に搬送されて各ノズルが順次用いられることにより、全体として32×32=1024個のノズル開口部が幅方向に間隔d1で配列されることになる。
この図7では、画像形成ドラム11をその回転軸の延長方向の側から見た側面図を示している。
なお、取付部材28は、搬送方向に異なるヘッドモジュール281ごとに別個に設けられても良いし、単一の取付部材28に対して異なる角度でヘッドモジュール281が取り付けられても良い。
図6Bには、ヘッドモジュールの変形例1を示す。
この変形例1のヘッドモジュール281aは、ヘッドモジュール281aをノズル面とは反対側の面から見た図で示されている。
この場合、ヘッドモジュール281aの固定部材には、記録ヘッド2811aの重量や取り付けの際にかかる力による歪みや変形の少ない金属(合金)部材が好ましく用いられる。
次に、本実施形態のインクジェット記録装置1におけるヘッドモジュールの変形例2について説明する。
この変形例2のヘッドモジュール281bには、図9Aの底面図に示すように、それぞれ3個ずつの記録ヘッド2811が一体的に設けられている。ヘッドモジュール281bは、Y方向に延在して配置され、X方向に平行に設けられた2個のヘッドモジュール281bが取付部材28に固定されている。
なお、この凹凸形状は、図9A及び図9Bに示したものに限られず、適宜変更することが出来る。即ち、凸部の幅、数や大きさは、適宜設定される。
次に、本実施形態のインクジェット記録装置1におけるヘッドモジュールの変形例3及び変形例4について説明する。
このように、ヘッドモジュール281が記録ヘッド単位で幅方向に長く、搬送方向に可能な限り短く形成されることで、ヘッドモジュール281を取付部材28に取り付ける際に回転方向に位置ずれが生じても、当該位置ずれによる回転角度を従来より小さく抑えることが出来る。従って、より容易に回転ずれによるノズル開口部の配置の乱れを防ぎ、その結果、画像の劣化を抑えることが出来る。
これにより、単純に1又は2本の直線上にノズル開口部を配置したのでは形成困難な密度でノズル開口部を配置して高精度な画像形成を行うことが出来る。また、このような高密度なノズル開口部の配置のケースで本発明に係る回転ずれの影響を低減する構成を用いることで、より効果的に高精度な画像の劣化を防ぐことが出来る。
例えば、上記実施の形態では、インクジェット記録装置1がラインヘッドとして説明したが、記録ヘッドが複数個幅方向に配列されたヘッドモジュールが複数設けられたものであれば、画像形成幅全体に亘って形成されていない走査型のものであっても良い。
その他、上記実施の形態で示した構成、構造、配置や形状などの具体的な細部は、本発明の趣旨を逸脱しない範囲において適宜変更可能である。
10 搬送部
11 画像形成ドラム
20 画像形成部
21 ヘッドユニット
22 クリーニング部
28 取付部材
281 ヘッドモジュール
281a ヘッドモジュール
281b ヘッドモジュール
281c ヘッドモジュール
281d ヘッドモジュール
2811 記録ヘッド
2811a 記録ヘッド
28c 取付部材
40 制御部
50 インク供給部
P 記録媒体
Claims (9)
- ノズル面に複数のノズル開口部が所定のパターン配置で設けられた記録ヘッドを複数個一次元配列して固定したヘッドモジュールを複数備え、
当該複数のヘッドモジュールは、それぞれ、記録媒体の搬送方向に垂直な幅方向に前記複数個の記録ヘッドが配列されるように前記幅方向の両端部で取付部材に取り付けられ、
前記ノズル開口部からインクを吐出させることで記録媒体に画像を形成する
ことを特徴とするインクジェット記録装置。 - 前記複数のヘッドモジュールは、
前記搬送方向に異なる少なくとも2つの位置に、前記記録ヘッドが千鳥格子状に配列されるように並列配置されている
ことを特徴とする請求項1記載のインクジェット記録装置。 - 搬送方向に曲率を有する搬送面上の記録媒体を、前記ノズル面と対向させながら搬送する搬送部を備え、
前記複数のヘッドモジュールは、それぞれ、前記ノズル面が当該ノズル面の搬送方向への中央から前記搬送面への垂線と垂直になるように配置されている
ことを特徴とする請求項2記載のインクジェット記録装置。 - 前記搬送方向に並列配置された前記複数のヘッドモジュールは、互いに隣接する側面にそれぞれ前記幅方向に凹凸形状を有し、当該凹凸形状は、一方の前記側面における凸部が他方の前記側面における凹部と対向配置されている
ことを特徴とする請求項2又は3記載のインクジェット記録装置。 - 前記搬送方向に並列配置された前記複数のヘッドモジュールは、互いに隣接する側面から各々所定の長さに亘り厚みが他の部分より薄く形成されて相対配置されている
ことを特徴とする請求項2又は3記載のインクジェット記録装置。 - 前記ノズル面に設けられた前記複数のノズル開口部は、前記記録ヘッドの各々で二次元配列され、当該二次元配列された前記複数のノズル開口部の形成領域は、搬送方向に2以上の第1所定数のノズルブロックに等分され、前記ノズルブロックの各々に設けられた複数の前記ノズル開口部は、幅方向の位置が隣り合う隣接ノズル開口部との当該幅方向の間隔が所定の第1間隔となるように設けられ、前記第1所定数のノズルブロックに各々設けられた前記ノズル開口部は、互いに幅方向に前記第1間隔を前記第1所定数で除した第2間隔ずつずらして配置されていることを特徴とする請求項1~5の何れか一項に記載のインクジェット記録装置。
- 前記第1所定数は4以上であり、
一の前記ノズルブロックに属する前記ノズル開口部から幅方向に前記第2間隔ずれて配置された前記ノズル開口部の属する隣接ノズルブロックが、前記一のノズルブロックから搬送方向に前記第1所定数より2以上小さい第2所定数のノズルブロック数以内で離隔した前記ノズルブロックであるように前記第1所定数の前記ノズルブロックが配置されていることを特徴とする請求項6記載のインクジェット記録装置。 - 前記第1所定数は4であり、
前記第1間隔は、前記ノズル開口部が1インチ当たり300個配置される幅である
ことを特徴とする請求項6又は7記載のインクジェット記録装置。 - 前記ノズルブロックのそれぞれに属する複数の前記ノズル開口部は、所定の第3間隔で幅方向に配列された前記ノズル開口部によるノズル列が前記第3間隔を前記第1間隔で除した列数に亘り前記搬送方向に配列されたパターンで設けられ、当該ノズル列の各々におけるノズル開口部は、互いに前記第1間隔ずつずらして配置されていることを特徴とする請求項6~8の何れか一項に記載のインクジェット記録装置。
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