JP2006051621A - Inkjet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording apparatus which can adjust the tilting of a plurality of recording heads without requiring the adjustment of arrangement positions of the plurality of recording heads. <P>SOLUTION: This inkjet recording apparatus 1 for performing recording by ejecting an ink droplet from nozzles onto a recording surface PP of a recording medium P for being carried is equipped with a head group HG wherein a plurality of heads HD1-HD8 with the following recording width constituted by arranging and forming the plurality of nozzles throughout a predetermined length are juxtaposed in a direction crossing the carrying direction X of the recording medium P, in such a manner that the carrying direction X of the recording medium P crosses the direction of extension of the recording width. Characteristically, the recording heads HD1-HD8 enable the inclination of the recording medium P with respect to the carrying direction X to be adjusted by making the center of any one of the plurality of nozzles serve as the center of rotation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ink jet recording apparatus that performs recording by ejecting ink droplets from nozzles, and more particularly to an ink jet recording apparatus in which a plurality of recording heads are arranged side by side in a direction that intersects the conveyance direction of a recording medium.

  In recent years, in order to increase the recording speed in an ink jet recording apparatus that records ink on a recording medium by ejecting ink droplets from nozzles, a recording width in which a large number of nozzles are arranged over the length of the recording medium is used. 2. Description of the Related Art An ink jet recording apparatus (hereinafter referred to as a line type ink jet recording apparatus) provided with a line type recording head (hereinafter referred to as a line head) has been put into practical use.

  In this line type ink jet recording apparatus, the recording medium is conveyed continuously or intermittently with the recording surface facing the surface on which the nozzles of the line head are formed. Further, the line head selectively ejects ink droplets toward the recording surface of the conveyed recording medium based on information to be recorded from among a large number of arranged nozzles. That is, the line type ink jet recording apparatus completes the recording on the recording medium only by moving the recording medium in one direction without moving the recording head. In this specification, an ink jet recording apparatus that completes recording only by moving a recording medium without moving a recording head is generically called a line type ink jet recording apparatus.

Conventionally, in this line type ink jet recording apparatus, a technique is known in which the arrangement angle of the recording head is adjusted around the reference hole to eliminate white stripes and black stripes generated at the boundary between the recording heads. (For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2003-145777 (Page 4, FIGS. 5, 12, and 13)

However, in the prior art of Patent Document 1, the reference hole KH is formed at a distance L1 from the nozzle NZf at one end of the recording head HD, as shown in FIG. This distance L1 is necessary to prevent the reference hole KH from interfering with the nozzle NZf and an ink flow path (not shown) communicating with the nozzle NZf.
As shown in FIG. 10B, the position of the nozzle NZf has a deviation of ΔY in the Y direction when the inclination of the recording head HD is adjusted in the R1 direction around the reference hole KH. Therefore, for example, when the arrangement positions of the plurality of recording heads HD are set such that the distance between the nozzles NZf at one end of the recording heads HD adjacent in the Y direction is a predetermined distance Py. Due to the deviation of the distance ΔY, the arrangement position of each recording head HD is displaced in the Y direction.

That is, when the inclination of one recording head is adjusted, it is necessary to adjust the arrangement position of the recording head adjacent to the recording head so that the distance between the nozzles of the recording heads is a predetermined distance in the Y direction. There is an unsolved problem that the arrangement positions of all the recording heads in the Y direction must be adjusted sequentially.
The present invention has been made to solve the above problems, and provides an ink jet recording apparatus capable of adjusting the inclination of a recording head without requiring adjustment of the arrangement positions of a plurality of recording heads. With the goal.

  In order to solve the above problems, a first invention according to the present invention is an ink jet recording apparatus that performs recording by ejecting ink droplets from nozzles onto a recording surface of a recording medium to be transported. A plurality of recording heads having a recording width formed by forming a plurality of arrays over the length intersect the transport direction of the recording medium by intersecting the transport direction of the recording medium and the extending direction of the recording width. A head group having a configuration in which the recording head is arranged in parallel, and the recording head is configured to be capable of adjusting an inclination with respect to a conveyance direction of the recording medium with one of the plurality of nozzles as a rotation center. An inkjet recording apparatus is provided.

According to the above configuration, the inclination of the recording head with respect to the conveyance direction of the recording medium is adjusted with the center of one of the plurality of nozzles constituting the recording width of the recording head as the rotation center. That is, even if the inclination of the recording head with respect to the recording medium conveyance direction is adjusted, the nozzle located at the center of rotation does not cause a positional shift.
As described above, even if the inclination of the recording head with respect to the conveyance direction of the recording medium is adjusted, it is possible to eliminate the need to adjust the arrangement positions of the plurality of recording heads in the direction intersecting the conveyance direction of the recording medium.
According to a second aspect of the present invention, there is provided an ink jet recording apparatus that performs recording by ejecting ink droplets from nozzles onto a recording surface of a conveyed recording medium, wherein a plurality of the nozzles are formed in a predetermined length. A plurality of recording heads having a recording width configured in a case body, a base plate that supports the recording head, a conveying direction of the recording medium and an extending direction of the recording width are intersected, and the recording medium A head group having a configuration arranged side by side in a direction crossing the transport direction, and the recording head is formed on the case body so that any one of the plurality of nozzles is a rotation center. Is engaged with a second engagement portion formed on the base plate so as to be rotatable, and is supported on the base plate so as to be capable of adjusting an inclination with respect to a conveyance direction of the recording medium. Characteristic ink jet To provide a door recording device.

According to said structure, the 1st engaging part formed in the case body so that any one center of a several nozzle may become a rotation center becomes the 2nd engaging part formed in the base plate. It is pivotally engaged.
As described above, the recording head can be rotated with respect to the base plate around the center of any one of the plurality of nozzles.

According to a third aspect, in the second aspect, the first engagement portion is formed with the center of the outermost nozzle at one end of the recording width as a rotation center. An ink jet recording apparatus is provided.
According to the above configuration, even when the inclination of the recording head is adjusted, the outermost nozzle at one end portion of the recording width is positioned at the center of rotation, so that no positional deviation occurs.

As described above, when adjusting the inclination of the recording head, pay attention only to the nozzles at the other end of the recording width, without worrying about the positional deviation of the outermost nozzle at one end of the recording width. This makes it possible to reduce the labor for adjustment.
According to a fourth aspect of the present invention, in the second or third aspect of the invention, the first engaging portion is constituted by a shaft that is formed to project from the case body, and the second engaging portion is the shaft. An ink jet recording apparatus comprising an engagement hole formed in the base plate so as to rotatably support the ink jet recording apparatus.

According to the above configuration, the shaft as the first engaging portion is formed in the case body of the recording head, and this shaft is engaged with the engaging hole as the second engaging portion formed in the base plate. Thus, the recording head can be rotatably supported.
As described above, since the first engaging portion is constituted by the shaft, it is possible to realize the rotation of the recording head without worrying about the influence on the nozzles, the ink flow paths and the like formed in the recording head. .

A first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1A, which is a plan view, an ink jet recording apparatus 1 according to the first embodiment of the present invention is a head having a gate roller GR, a paper transport unit CV, and eight recording heads HD1 to HD8. A group HG and a paper discharge unit EJ are provided. In FIG. 1, the X direction indicates the conveyance direction of the recording paper P, and the Y direction indicates a direction orthogonal to the X direction.

Here, the detail of each said structure is demonstrated.
As shown in FIG. 1A, the paper transport unit CV includes a drive shaft DS to which power is transmitted from a transport unit drive motor (not shown) that drives the paper transport unit CV, and a drive shaft DS that is parallel to the drive shaft DS. A driven shaft FS disposed on the upstream side in the X direction, and a drive belt DS and a conveyor belt V that spans the driven shaft FS.

Here, although not shown, the drive shaft DS and the driven shaft FS are rotatably held in the housing by bearings.
Further, although not shown, the driven shaft FS is applied with a force in the upstream direction in order to apply tension so as not to loosen the conveyor belt V that is stretched between the driven shaft FS and the drive shaft DS.
The conveyance belt V is rotated counterclockwise as viewed in FIG. 1B by the power of the conveyance unit drive motor, and the recording paper P placed on the conveyance belt V is moved in the X direction, which is the conveyance direction. Transport.

Further, the paper transport unit CV includes an index sensor IS that outputs an index signal serving as a reference for controlling the rotation of the transport belt V.
The index sensor IS is composed of, for example, an optical sensor including a light emitting element such as a photo interrupter and a light receiving element, and the index portion ID provided on the transport belt V blocks the optical axis between the light emitting element and the light receiving element. And changing the output voltage. The index signal uses the change in the output voltage, and the timing for supplying the recording paper P to the paper transport unit CV, the timing for recording by each of the recording heads HD1 to HD8 of the head group HG, and the like. Become.

As shown in FIG. 2 which is a perspective view, the head group HG includes a base plate BP and recording heads HD1 to HD8. As shown in FIG. 4A, which is a plan view of the base plate BP, positioning holes PH as second engaging portions with which positioning pins PJ described later are engaged are formed at predetermined intervals Py in the Y direction. Yes.
As shown in FIG. 2, each of the recording heads HD1 to HD8 includes an upper case body CBu in which the nozzles NZ are formed and a lower case body CBd attached to the base plate BP. Further, the upper case body CBu and the lower case body CBd are integrally fixed.

Here, the arrangement of the nozzles NZ provided in the upper case body CBu will be described.
3A and 3B are views showing the external appearance of the upper case body CBu. FIG. 3A is a front view in the direction B in FIG. 1A, and FIG. 3B is a bottom view. In FIG. 3, in order to show the nozzles in an easy-to-understand manner, the size of the nozzles is exaggerated and the number is reduced.
In the upper case body CBu, as shown in FIG. 3B, a required number of nozzles NZ for ejecting ink droplets are arranged at equal intervals over the arrangement distance KH. This arrangement distance KH is the recording width of each recording head HD1 to HD8. As the recording heads HD1 to HD8, recording heads that apply pressure to ink by a piezoelectric element, a heating element or the like and eject ink droplets from the nozzles NZ can be employed.

Further, as shown in FIG. 2, the lower case body CBd is formed in a rectangular parallelepiped shape, and the center line of the outermost nozzle NZf on one end side among the plurality of nozzles NZ formed on the upper case body CBu on the lower surface thereof. A positioning pin PJ is formed as a first engaging portion with the rotation center as a protrusion.
Each of the recording heads HD1 to HD8 engages the positioning pin PJ with the positioning hole PH of the base plate BP, and as shown in FIG. 4B, the recording width KH is inclined by a predetermined angle θ from the X direction. In the state, it is disposed on the base plate BP.

The arrangement interval in the Y direction of these recording heads HD1 to HD8 is the outermost position on one end side of the recording width KH between the recording heads HD1 to HD8 adjacent in the Y direction by the positioning hole PH of the base plate BP. A predetermined interval Py is provided between the nozzles NZf.
Further, the predetermined angle θ and the predetermined interval Py are set between the recording heads HD1 to HD8 adjacent in the Y direction, the nozzles NZe at the other end in the recording width KH of one recording head HD1 to HD8, and the other recording head HD1. The nozzle NZf at one end in the recording width KH of .about.HD8 is set so as to overlap when viewed from the X direction. That is, the recording area KR in the inkjet recording apparatus 1 is configured by tilting the recording width KH of the recording heads HD1 to HD8 by a predetermined angle θ from the X direction and arranging them at a predetermined interval Py in the Y direction. Each lower case body CBd and the base plate BP are bonded and fixed after a predetermined angle adjustment is performed.

1A and 1B, the head group HG is arranged with the nozzles NZ of the recording heads HD1 to HD8 facing the recording surface PP of the recording paper P on the paper transport unit CV. ing.
Here, the connection of the control of each main part of the inkjet recording apparatus 1 described above will be described.

In addition to the main components described above, the ink jet recording apparatus 1 further includes a paper feeding unit KS that feeds the recording paper P to the gate roller GR as shown in FIG. 5 which is a block diagram.
Further, the inkjet recording apparatus 1 includes a paper feed control unit KSD that controls the paper feed unit KS, a gate roller control unit GRD that controls the gate roller GR, a sensor control unit SD that controls the index sensor IS, and a transport unit drive. A motor control unit MD that controls the motor Mo, a recording head control unit HDD that controls each of the recording heads HD1 to HD8, a paper discharge control unit EJD that controls the paper discharge unit EJ, and recording information from an external device are stored. A recording information storage unit BF, and a CPU that issues an operation command to each of the control units KSD, GRD, SD, MD, HDD, and EJD based on the recording information.

Next, the recording operation in the inkjet recording apparatus 1 will be described below.
The inkjet recording apparatus 1 shown in FIG. 1 starts a recording operation when receiving recording information and a recording command from an external device.
When the recording operation is started, the CPU sends a conveyance unit drive command to the motor control unit MD, and the conveyance unit drive motor Mo is counterclockwise when the conveyance belt V is viewed in FIG. The drive is controlled to rotate in the direction.

At the same time or later than this, the CPU sends a paper feed command for instructing the supply of the recording paper P to the gate roller GR to the paper feed controller KSD.
Upon receiving a paper feed command from the CPU, the paper feed control unit KSD controls the paper feed unit KS and supplies the recording paper P one by one from the paper cassette (not shown) in which a plurality of recording papers P are stored to the gate roller GR. Let

When the recording paper P is supplied, the gate roller GR performs skew correction for correcting the inclination of the recording paper P with respect to the X direction and the positional deviation in the Y direction.
When the index part ID blocks the optical axis between the light emitting element and the light receiving element of the index sensor IS, an index signal is output from the index sensor IS to the CPU.
When the index signal is input, the CPU starts measuring the time for each of the recording heads HD1 to HD8 to record on the recording paper P, and controls the gate roller GR to drive the gate roller GR, thereby recording the recording paper. P is sent out to the paper transport unit CV.

  The recording paper P sent to the paper transport unit CV is placed on the outer peripheral surface of the transport belt V rotated counterclockwise as viewed in FIG. The heads HD1 to HD8 are guided below. The recording paper P or the conveyance belt V is charged so that the recording paper P does not deviate from the position on the conveyance belt V, or an opening is formed on the surface of the conveyance belt V on which the recording paper P is loaded. It is desirable that the recording paper P be adsorbed on the conveying belt V by forming the air and sucking air using a suction fan.

Then, the CPU sends a recording command to the recording head controller HDD when it is time to start recording by the recording heads HD1 to HD8 within the measured time.
The recording head controller HDD controls the recording heads HD1 to HD8 based on the recording command, and records the recording area PP on the recording surface PP of the recording paper P that is continuously conveyed by the conveying belt V based on the recording information. Recording is performed by selectively ejecting ink droplets from a plurality of nozzles NZ constituting the KR.

When this recording is completed, the recording on one recording paper P is completed, and the recording paper P is discharged out of the inkjet recording apparatus 1 by the paper discharge unit EJ controlled by the paper discharge control unit EJD.
Here, when the recording of all of the recording information is completed, the recording operation is completed, and when the unrecorded recording information remains, a new recording sheet P is supplied to the gate roller GR at the above-described sheet feeding timing. Then, the recording operation is continued until the recording of all the recorded information is completed.

Next, a method for manufacturing the head group HG in the inkjet recording apparatus 1 will be described below.
As shown in FIG. 6A, each upper case body CBu has a predetermined distance D1 and D2 from the center position of the nozzle NZf by grinding one side surface S1 in the longitudinal direction and the side surface S2 intersecting the side surface S1, respectively. It is finished to have a smooth finish.

  As shown in FIG. 6B, each lower case body CBd is also smoothly finished by grinding so that the side surface S3 and the side surface S4 have predetermined distances D1 and D2 from the center position of the positioning pin PJ, respectively. Yes. Note that the positioning pin PJ may be in any form, such as an aspect formed integrally with the lower case body CBd, a form pressed into a hole formed in the lower case body CBd, or the like.

  Then, each upper case body CBu and each lower case body CBd are placed on a flat surface such as a surface plate, and the side surface S1 of the upper case body CBu and the side surface of the lower case body CBd. Adhering and fixing are performed so that S3 faces the same direction and forms the same plane, and side surface S2 and side surface S4 face the same direction and form the same plane. When the upper case body CBu and the lower case body CBd are bonded and fixed in this manner, the recording heads HD1 to HD8 shown in FIG. 6C are completed.

The recording heads HD1 to HD8 are placed on the base plate BP with the positioning pins PJ engaged with the positioning holes PH of the base plate BP. Here, it is desirable that the engagement between the positioning pin PJ and the positioning hole PH is set so as to be an interference fit within a limit capable of adjusting the inclination described later.
In the state where the recording heads HD1 to HD8 are placed on the base plate BP, as shown in FIG. 7A, an appropriate recording area KR is not configured. Therefore, first, the position between the outermost nozzle NZf on one end side and the outermost nozzle NZe on the other end side in the recording width KH is predetermined in the Y direction around the positioning pin PJ that engages the recording head HD8 with the positioning hole PH. The inclination of the recording head HD8 is adjusted by rotating in the R1 direction in FIG. Here, the inclination adjustment of the recording heads HD1 to HD8 is performed while confirming the position of the nozzle NZe using a tool microscope, a projector, or the like. At this time, the position of the nozzle NZe may be grasped using an image processing apparatus and automatically performed by the positioning apparatus.

Next, the recording head HD7 adjacent to the recording head HD8 is rotated so that the position of the nozzle NZe of the recording head HD7 overlaps the position of the nozzle NZf of the recording head HD8 when viewed from the X direction. Adjust the tilt. Thereafter, when the inclination is adjusted by the same method up to the recording head HD1, an appropriate recording area KR shown in FIG. 4B is formed.
Then, after the inclination adjustment of each of the recording heads HD1 to HD8 is finished, the recording heads HD1 to HD8 and the base plate BP are bonded and fixed to complete the head group HG. Note that the adhesive fixing between the recording heads HD1 to HD8 and the base plate BP may be performed every time the inclination adjustment of each recording head HD1 to HD8 is completed.

  As described above, even if the inclinations of the recording heads HD1 to HD8 are adjusted, the predetermined interval Py between the outermost nozzles NZf on one end side in the recording width KH between the recording heads HD1 to HD8 adjacent in the Y direction is It does not change. That is, it is not necessary to adjust the arrangement positions of the recording heads HD1 to HD8 in the Y direction after the tilt adjustment. Accordingly, it is possible to easily obtain a good recording quality at the recording boundary between the recording heads HD1 to HD8.

  The recording heads HD1 to HD8 are arranged between the recording heads HD1 to HD8 adjacent in the Y direction, and the outermost nozzle NZf on one end side of one recording head HD1 to HD8 and the other end side of the other recording head HD1 to HD8. The outermost nozzle NZe is arranged so as to overlap with the X direction. Accordingly, printing is performed by alternately ejecting ink droplets from the nozzles NZf of one of the recording heads HD1 to HD8 and the nozzle NZe of the other recording heads HD1 to HD8 at the recording boundary between these recording heads HD1 to HD8. By such a method, it becomes possible to make the recording boundary portion inconspicuous.

Further, the inclinations of the recording heads HD1 to HD8 are adjusted with reference to the positioning pins PJ of the lower case body CBd and the positioning holes PH of the base plate BP. Therefore, it is possible to adjust the inclinations of the recording heads HD1 to HD8 without worrying about the influence on the nozzles NZ and the ink flow paths formed in the upper case body CBu.
A second embodiment of the present invention will be described with reference to the drawings.

  The inkjet recording apparatus 1 according to the second embodiment supports the recording heads HD1 to HD8 in the head group HG of the first embodiment so that the recording heads HD1 to HD8 can rotate without being bonded and fixed to the base plate BP. The structure is the same as that of the first embodiment except that an inclination adjusting mechanism is provided for adjusting the inclination of each of the recording heads HD1 to HD8 by rotating around the positioning hole PH of the base plate BP. The parts corresponding to those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8A, the head group HG2 of the inkjet recording apparatus 1 according to the second embodiment has a tilt adjusting mechanism on the other end side opposite to the positioning pin PJ side for each of the recording heads HD1 to HD8. I have. As shown in FIGS. 8A and 8B, the tilt adjusting mechanism includes an eccentric cam Cm, a coil spring SP, and a servo motor SV as an actuator that rotationally drives the eccentric cam Cm. Yes. Each of the recording heads HD1 to HD8 is biased from one side in the longitudinal direction by the coil spring SP, and the other side is in contact with the outer peripheral surface of the eccentric cam Cm.

As shown in FIG. 8B, which is an enlarged view of the CC cross section in FIG. 8A, the servo motor SV has recording heads HD1 to HD8 placed in openings formed in the base plate BP. The rotation axis RJ is inserted from the surface UP opposite to the surface MP to be fixed, and is fixed to the surface UP of the base plate BP.
The eccentric cam Cm is press-fitted into the rotation shaft RJ of the servo motor SV from the surface MP side of the base plate BP. That is, when the servo motor SV is driven to rotate the eccentric cam Cm, the recording heads HD1 to HD8 are swung around the positioning hole PH of the base plate BP.

In FIG. 8B, the detailed cross section of the upper case body CBu other than the nozzle NZ and the detailed cross section of the servo motor SV are omitted.
Further, the lower case body CBd is configured so that the retaining washers WS are press-fitted into the positioning pins PJ across the base plate BP so that the recording heads HD1 to HD8 do not fall on the transport belt V.

The inclination of each of the recording heads HD1 to HD8 is adjusted within the swing range of each of the recording heads HD1 to HD8 driven by the servo motor SV.
Inclination adjustment of the recording heads HD1 to HD8 in the ink jet recording apparatus 1 of the second embodiment is performed by applying ink droplets from all the nozzles NZ of all the recording heads HD1 to HD8 to the recording paper P conveyed by the paper conveyance unit CV. This is performed based on test recording in which dots are formed by discharging at a predetermined cycle.

  As a result of this test recording, when recording irregularities such as white stripes and black stripes occur at the recording boundary portions of the recording heads HD1 to HD8 adjacent in the Y direction, the servo heads are driven to drive the recording heads. Adjust the tilt of HD1 to HD8. At this time, the result of the test recording may be confirmed visually, or the distance between dots may be grasped using an optical image reading device such as a scanner and an image data processing device.

  Here, when the power supply of the ink jet recording apparatus 1 is OFF, power is not supplied to the servo motor SV, so that the inclinations of the recording heads HD1 to HD8 adjusted appropriately are shifted by the force of the coil spring SP. May end up. Therefore, after the inclination of each of the recording heads HD1 to HD8 is properly adjusted, the rotation amount of each servo motor SV is stored in a nonvolatile storage unit (not shown). Each time the power supply of the ink jet recording apparatus 1 is turned from OFF to ON, the rotation position of the rotation shaft RJ of each servo motor SV is controlled based on the stored rotation amount.

In this way, even if the inclination of the recording heads HD1 to HD8 is shifted while the power of the inkjet recording apparatus 1 is OFF, the inclination of each of the recording heads HD1 to HD8 is turned on when the power is turned OFF. Can be controlled to an appropriate state.
According to the second embodiment, even when the predetermined angle θ of each of the recording heads HD1 to HD8 has changed with the passage of time of use of the inkjet recording apparatus 1, the tilt adjustment can be easily performed and the recording can be performed. It becomes possible to maintain the quality in a good state.

In the first and second embodiments, the positioning pin PJ as the first engaging portion is rotated around the center of the outermost nozzle NZf on one end side among the plurality of nozzles NZ of the recording heads HD1 to HD8. However, the present invention is not limited to this, and any one center other than the nozzle NZf may be formed as the rotation center.
In the first and second embodiments, the case where each of the recording heads HD1 to HD8 is disposed in a state where the recording width KH is inclined at a predetermined angle θ from the X direction is described as an example. As shown in FIGS. 9A and 9B, the recording width KH may be arranged along the Y direction.

In the first and second embodiments, the recording heads HD1 to HD8 are configured by the upper case body CBu and the lower case body CBd. However, they may be formed as an integral case body. If constituted in this way, either upper case body CBu or lower case body CBd can be omitted, the number of parts can be reduced, and the cost can be reduced.
In the second embodiment, the eccentric cam Cm is rotated by driving the servo motor SV as an actuator. However, the present invention is not limited to this, and the eccentric cam Cm is manually rotated from the surface UP side of the base plate BP. May be. With this configuration, the actuator can be omitted, the number of parts can be reduced, and the cost can be reduced.

In the first and second embodiments, the case where the number of the recording heads HD1 to HD8 constituting the head group HG is eight is described as an example. However, the present invention is not limited to this, and the number of recording heads is Are set based on conditions such as the number of nozzles, the nozzle density, and the size of the recording paper.
In the first and second embodiments, the configuration in which the ink droplets of the same color are ejected from the recording heads HD1 to HD8 to perform single color recording has been described as an example. A recording head that discharges ink may be further provided so as to perform recording of a plurality of colors.

1 is an external view showing a main configuration of an ink jet recording apparatus according to a first embodiment of the present invention. FIG. 3 is a perspective view illustrating a configuration of a head group of the ink jet recording apparatus according to the first embodiment. FIG. 4 is a diagram illustrating an arrangement of nozzles of a recording head. FIG. 3 is a diagram illustrating a recording area of the ink jet recording apparatus according to the embodiment of the present invention. FIG. 3 is a block diagram illustrating a connection of control of main parts of the ink jet recording apparatus according to the first embodiment. 3A and 3B illustrate a method for manufacturing a recording head. FIG. 3 is a diagram illustrating a method for manufacturing a head group of the ink jet recording apparatus according to the first embodiment. The figure explaining the structure of the head group of the inkjet recording device in 2nd Embodiment. The figure which shows the other structural example of a head group. The figure explaining the subject of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inkjet recording device, HD1-HD8 ... Recording head, KH ... Recording width, HG, HG2 ... Head group, BP ... Base plate, CBu ... Upper case body, CBd ... Lower case body, PH ... Positioning hole, PJ ... Positioning pin

Claims (4)

An inkjet recording apparatus that performs recording by ejecting ink droplets from nozzles onto a recording surface of a recording medium to be conveyed,
A plurality of recording heads having a recording width formed by arranging a plurality of the nozzles over a predetermined length, the recording medium conveying direction and the recording width extending direction intersecting, the recording medium Comprising a head group having a configuration arranged in parallel in a direction intersecting the transport direction of
The ink-jet recording apparatus, wherein the recording head is configured to be capable of adjusting an inclination with respect to a conveyance direction of the recording medium with one of the plurality of nozzles as a rotation center. An inkjet recording apparatus that performs recording by ejecting ink droplets from nozzles onto a recording surface of a recording medium to be conveyed,
A plurality of recording heads having a recording width formed by arranging a plurality of the nozzles over a predetermined length in a case body, a base plate supporting the recording head, a transport direction of the recording medium, and the A head group having a configuration in which the extending direction of the recording width is crossed and arranged in a direction crossing the transport direction of the recording medium;
In the recording head, a first engagement portion formed on the case body so that any one of the plurality of nozzles is a rotation center is a second engagement portion formed on the base plate. An ink jet recording apparatus, wherein the ink jet recording apparatus is rotatably engaged with the base plate and is supported on the base plate so as to be adjustable in inclination with respect to the transport direction of the recording medium.   The inkjet recording apparatus according to claim 2, wherein the first engaging portion is formed with the center of the outermost nozzle at one end of the recording width as a rotation center.   The first engagement portion is constituted by a shaft protruding from the case body, and the second engagement portion is an engagement formed on the base plate so as to rotatably support the shaft. The ink jet recording apparatus according to claim 2, wherein the ink jet recording apparatus is configured by a joint hole.

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