Patent Publication Number: US-2021187973-A1

Title: Inkjet recording apparatus capable of easy access to a conveying unit of a recording medium

Description:
INCORPORATION BY REFERENCE 
     This application is based on and claims the benefit of priority from Japanese Patent Application No. 2019-231816 filed on Dec. 23, 2019, the contents of which are hereby incorporated by reference. 
     BACKGROUND 
     The present disclosure relates to an inkjet recording apparatus. 
     In an inkjet recording apparatus, a recording head that ejects ink onto a recording medium such as paper or the like may be moved according to various purposes. For example, in a case of performing maintenance on the recording head, the recording head may be moved upward to perform capping or cleaning on the ink ejection surface of the recording head. 
     For example, a typical inkjet recording apparatus has a line head moving mechanism for moving a line head, which is a recording head, in the vertical direction. This line head moving mechanism is provided with a rack and pinion mechanism on each of the front plate and the rear plate. The front plate and the rear plate are attached to the front and rear of a raising/lowering unit having a line head group. The front and rear of the raising/lowering unit are both end portions in the paper width direction orthogonal to the paper conveying direction. A motor rotates gears that engage with racks provided on the front plate and the rear plate, respectively. As a result, the line head group moves up and down together with the raising/lowering unit. 
     SUMMARY 
     In order to solve the problem described above, the inkjet recording apparatus according to the present disclosure includes a recording unit, a conveying unit, a maintenance unit, a frame unit, a vertical drive unit, and a conveying direction drive unit. The recording unit records an image by ejecting ink onto a recording medium. The conveying unit is arranged below the recording unit and conveys the recording medium. The maintenance unit is arranged so as to be movable in a horizontal direction above the conveying unit and performs maintenance on an ink ejection surface of the recording unit. The frame unit movably supports the recording unit and the maintenance unit. The vertical drive unit moves the recording unit in a vertical direction. The conveying direction drive unit moves the maintenance unit along a conveying direction of the recording medium below the recording unit that is been moved upward. The frame unit has two wall portions arranged at each of both end portions of the recording unit and the maintenance unit in a width direction orthogonal to the conveying direction of the recording medium and that support the recording unit and the maintenance unit. At least one of the two wall portions has a cutout portion in a lower side. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic cross-sectional front view of the inkjet recording apparatus of an embodiment according to the present disclosure. 
         FIG. 2  is a schematic plan view of the periphery of a recording unit of the inkjet recording apparatus in  FIG. 1 . 
         FIG. 3  is an external perspective view of the periphery of the recording unit of the inkjet recording apparatus in  FIG. 1 . 
         FIG. 4  is a schematic cross-sectional front view illustrating the periphery of the recording unit of the inkjet recording apparatus in  FIG. 1 . 
         FIG. 5  is a perspective view of the recording unit in  FIG. 3  as viewed from the front. 
         FIG. 6  is a perspective view of a frame unit in  FIG. 3  as viewed from the front. 
         FIG. 7  is a perspective view of the frame unit in  FIG. 3  as viewed from the rear. 
         FIG. 8  is a perspective view of the recording unit in  FIG. 3  as viewed from above. 
         FIG. 9  is a perspective view of the recording unit in  FIG. 3  as viewed from below. 
         FIG. 10  is a schematic plan view of a vertical drive unit of the recording unit in  FIG. 4 . 
         FIG. 11  is a side view of the recording unit in  FIG. 3 . 
         FIG. 12  is a side view of the recording unit in  FIG. 3 , and illustrates a state in which the recording unit is raised. 
         FIG. 13  is a partial perspective view of the periphery of the recording unit in  FIG. 3 , and illustrates a state in which the recording unit is raised. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. Note that the technique according to the present disclosure is not limited to the following contents. 
       FIG. 1  is a schematic cross-sectional front view of the inkjet recording apparatus  1  of an embodiment.  FIG. 2  is a schematic plan view of the periphery of a recording unit  4  of the inkjet recording apparatus  1  in  FIG. 1 . The inkjet recording apparatus  1  is, for example, an inkjet recording type printer. The inkjet recording apparatus  1  is connected between, for example, a paper supply device  101  and a paper post-processing device  102 . 
     The paper supply device  101  accommodates a plurality of sheets of paper (recording medium), separates the sheets of paper one by one at the time of recording in the inkjet recording apparatus  1 , and feeds the paper out to the inkjet recording apparatus  1 . The inkjet recording apparatus  1  conveys the paper fed out by the paper supply device  101  from the paper inlet  21 . Note that the inkjet recording apparatus  1  itself may be provided with a paper supply unit. 
     The paper post-processing device  102  receives the paper on which an image is recorded by the inkjet recording apparatus  1 . The paper post-processing device  102  performs post processing on the paper as necessary and discharges the paper. The inkjet recording apparatus  1  discharges the paper on which an image is recorded from the paper-discharge port  22  to the paper post-processing device  102 . Note that the inkjet recording apparatus  1  itself may be provided with a paper-discharge tray or the like. 
     As illustrated in  FIGS. 1 and 2 , the inkjet recording apparatus  1  includes a device main body  2 , a paper conveying unit  3 , a recording unit  4 , a drying unit  5 , and a control unit  6 . 
     The paper conveying unit  3  conveys the paper received from the paper supply device  101  via the paper input port  21  to the recording unit  4  and the drying unit  5 . Furthermore, the paper conveying unit  3  conveys the paper after recording and drying from the paper-discharge port  22 . In a case where double-sided recording is performed, the paper conveying unit  3  distributes the recorded and dried paper on a first surface to a reverse conveying unit  34  by a branching unit  33 . Furthermore, the paper conveying unit  3  switches the conveying direction and inverts the front and back sides. The paper conveying unit  3  conveys the paper that has been inverted from front to back to the recording unit  4  and the drying unit  5  again. 
     The paper conveying unit  3  has a first belt conveying unit  31  and a second belt conveying unit  32 . The first belt conveying unit  31  and the second belt conveying unit  32  attract and hold the paper on the upper surface of a continuous belt and convey the paper. The first belt conveying unit  31  conveys paper that is arranged below the recording unit  42 , which will be described later. The second belt conveying unit  32  conveys paper that is arranged in the drying unit  5 . 
     The recording unit  4  is arranged on the downstream side in the paper conveying direction of the paper input port  21  and on the upstream side in the paper conveying direction of the drying unit  5 . The recording unit  4  faces the paper that is attracted to and held on the upper surface of the belt of the first belt conveying unit  31  and conveyed. The recording unit  4  is arranged above the first belt conveying unit  31  at a specified interval. 
     The recording unit  4  includes recording units  4 B,  4 C,  4 M,  4 Y,  4 X, and  4 Z provided corresponding to each of the four colors of black, cyan, magenta, and yellow, and two other colors. The six-color recording units  4 B,  4 C,  4 M,  4 Y,  4 X, and  4 Z are arranged side-by-side along the paper conveying direction. The recording units  4 B,  4 C,  4 M,  4 Y,  4 X, and  4 Z sequentially eject six colors of ink onto the paper and record a full-color image or a monochrome image on the paper. This paper is conveyed by the first belt conveying unit  31 . The detailed configuration of the recording unit  4  will be described later. 
     The drying unit  5  is arranged on the downstream side in the paper conveying direction of the recording unit  4 , and a second belt conveying unit  32  is provided. The paper on which an ink image is recorded by the recording unit  4  is attracted to and held on the upper surface of the belt of the second belt conveying unit  32  in the drying unit  5  and conveyed. During this time the ink is dried. 
     The control unit  6  includes a CPU, a storage unit, other electronic circuits, and electronic components. The CPU controls the operation of each component provided in the inkjet recording apparatus  1  based on a control program and data stored in the storage unit. As a result, the CPU performs processing related to the functions of the inkjet recording apparatus  1 . Each of the paper conveying unit  3 , the recording unit  4 , and the drying unit  5  receives commands individually from the control unit  6  and records on paper in conjunction with each other. The storage unit is configured, for example, by a combination of a non-volatile storage device and a volatile storage device. The non-volatile storage device is a program ROM (Read Only Memory), data ROM, or the like. The volatile storage device is a RAM (Random Access Memory) or the like. 
     Next, the configuration of the recording unit  4  of the inkjet recording apparatus  1  will be described with reference to  FIGS. 3 to 13  in addition to  FIGS. 1 and 2 .  FIG. 3  is an external perspective view of the periphery of the recording unit  4  of the inkjet recording apparatus  1  in  FIG. 1 .  FIG. 4  is a schematic plan view of the periphery of the recording unit  4  of the inkjet recording apparatus  1  in  FIG. 1 .  FIG. 5  is a perspective view of the recording unit  4  in  FIG. 3  as viewed from the front.  FIG. 6  is a perspective view of a frame unit  41  in  FIG. 3  as viewed from the front.  FIG. 7  is a perspective view of the frame unit  41  in  FIG. 3  as viewed from the rear.  FIG. 8  is a perspective view of the recording unit  42  in  FIG. 3  as viewed from above.  FIG. 9  is a perspective view of the recording unit  42  in  FIG. 3  as viewed from below.  FIG. 10  is a schematic plan view of a vertical drive unit  43  of the recording unit  4  in  FIG. 4 .  FIG. 11  is a side view of the recording unit  4  in  FIG. 3 .  FIG. 12  is a side view of the recording unit  4  in  FIG. 3 , and illustrates a state in which the recording unit  42  is raised.  FIG. 13  is a partial perspective view of the periphery of the recording unit  4  in  FIG. 3 , and illustrates a state in which the recording unit  42  is raised. 
     Note that in  FIGS. 2, 3, 4, and 5 , the right side in the drawing is the upstream side in the paper conveying direction Dc, and the left side is the downstream side in the paper conveying direction Dc. Moreover, the six-color recording units  4 B,  4 C,  4 M,  4 Y,  4 X, and  4 Z each have the same shape, size, and configuration. Therefore, in the following description, the description of the identification code representing each color may be omitted. 
     As illustrated in  FIGS. 2, 3, 4, and 5 , the recording unit  4  includes a frame unit  41 , a recording unit  42 , a vertical drive unit  43 , a maintenance unit  44 , and a conveying direction drive unit  45 . 
     As illustrated in  FIGS. 4 and 5 , the frame unit  41  is a housing that is arranged around the recording unit  42  and the maintenance unit  44  and supports the recording unit  42  and the maintenance unit  44 . As illustrated in  FIGS. 5, 6 and 7 , the frame unit  41  includes a front wall portion  411 , a back wall portion  412 , a connecting member  413 , an upper cover  414 , a vertical guide member  415 , and a conveying direction guide member  416 . 
     The front wall portion  411  and the back wall portion  412  are arranged so as to face each other in the paper width direction Dw orthogonal to the paper conveying direction Dc. The front wall portion  411  and the back wall portion  412  have a plate shape extending in the paper conveying direction Dc and in the vertical direction. The recording unit  42  and the maintenance unit  44  are located between the front wall portion  411  and the back wall portion  412  in the paper width direction Dw, and are supported by the respective wall portions. 
     A plurality of connecting members  413  are arranged between the front wall portion  411  and the back wall portion  412 , and the front wall portion  411  and the back wall portion  412  are connected so as to be separated by a specified distance in the paper width direction Dw. The connecting member  413  has a rod shape extending in the paper width direction Dw. 
     The upper cover  414  is arranged so as to span between the front wall portion  411  and the back wall portion  412  at the upper end portion of the frame portion  41 . The upper cover  414  has a plate shape extending in the paper width direction Dw and in the horizontal direction. 
     As illustrated in  FIGS. 6 and 7 , a vertical guide member  415  and a conveying direction guide member  416  are provided on the inner surface in the paper width direction Dw of both the front wall portion  411  and the back wall portion  412 , respectively. A vertical guide member  415  is arranged in the upstream portion in the paper conveying direction Dc on the front wall portion  411  and the back wall portion  412 , respectively. A conveying direction guide member  416  is arranged below the front wall portion  411  and the back wall portion  412 , respectively. 
     A vertical guide member  415  is arranged at each of both end portions of the recording unit  42  in the paper width direction Dw and extend in the vertical direction. The lower end of the vertical guide member  415  extends to the vicinity of the first belt conveying unit  31 . The frame portion  41  movably supports the recording unit  42  in the vertical direction via the vertical guide member  415 . 
     A conveying direction guide member  416  is arranged at both end portions in the paper width direction Dw of the maintenance unit  44  and extends in the paper conveying direction Dc. The frame unit  41  movably supports the maintenance unit  44  in the paper conveying direction Dc via the conveying direction guide members  416 . 
     As illustrated in  FIGS. 2, 4 and 5 , the recording unit  42  is arranged in the upstream portion in the paper conveying direction Dc of the frame unit  41 . The recording unit  42  is individually supported by the front wall portion  411  and the back wall portion  412  at each of both end portions in the paper width direction Dw. The recording unit  42  is arranged above the first belt conveying unit  31  so as to be movable in the vertical direction. 
     As illustrated in  FIGS. 2 and 4 , the recording unit  42  faces in the vertical direction the paper that is attracted to and held on the upper surface of the belt of the first belt conveying unit  31  and conveyed. The recording unit  42  is arranged above the first belt conveying unit  31  at a specified interval. As illustrated in  FIGS. 8 and 9 , the recording unit  42  is configured by a rectangular parallelepiped shape extending in the paper width direction Dw. The recording unit  42  has a line-type inkjet recording head  421 . A plurality (for example, three) of recording heads  421  are arranged in a staggered pattern along the paper width direction Dw. 
     As illustrated in  FIG. 9 , the recording head  421  has an ink ejection surface  421   a  on the bottom surface thereof. Furthermore, the recording head  421  includes a plurality of ink ejection nozzles  4211  (see  FIG. 2 ) that open on the ink ejection surface  421   a.  The plurality of ink ejection nozzles  4211  are arranged side-by-side along the paper width direction Dw. The plurality of ink ejection nozzles  4211  are able to eject ink over the entire recording area of the paper. As a result, the recording head  421  ejects ink onto the paper and records an image. 
     Note that as illustrated in  FIG. 5 , an ink supply unit  46  is provided behind the back wall portion  412 . The ink supply unit  46  has a sub tank for storing ink. The ink supply unit  46  is configured by a tube or the like, and supplies ink to the recording head  421  via connected ink supply paths  461 ,  422 . 
     As illustrated in  FIGS. 4, 10 and 11 , the vertical drive unit  43  is provided in the frame unit  41 . The vertical drive unit  43  moves the recording unit  42  in the vertical direction along the vertical guide member  415 . The vertical drive unit  43  includes a ball screw unit  431 , a pulley  432 , a timing belt  433 , and a motor  434 . 
     Ball screw units  431  are arranged at both end potions of the recording unit  42  in the paper width direction Dw, respectively. The ball screw unit  431  includes a screw shaft  4311  and a nut portion. The screw shaft  4311  extends in the vertical direction. The nut portion includes a large number of balls inside and is attached to the screw shaft  4311 . The nut portion is connected to the end portion of the recording unit  42  in the paper width direction Dw. When the screw shaft  4311  rotates, the recording unit  42  connected to the nut portion moves in the vertical direction along the rotation axis of the screw shaft  4311 . In other words, the recording unit  42  is connected to the ball screw unit  431  so as to be able to move in the vertical direction. 
     The pulley  432  includes a drive pulley  4321 , a driven pulley  4322 , and a tension pulley  4323 . The drive pulley  4321  is attached to the shaft portion of the motor  434  so as to be aligned with the rotation axis, and is rotated by the motor  434 . A driven pulley  4322  is attached to the upper end potion of each of the two screw shafts  4311  so as to be aligned with the rotation axis. The tension pulley  4323  comes into contact with the outer peripheral portion of a timing belt  433 . 
     The timing belt  433  is wound around the drive pulley  4321  and the two driven pulleys  4322 . Note that the tension pulley  4323  may be brought into contact with and press against the outer peripheral portion of the timing belt  433 . As a result, the tension of the timing belt  433  may be adjusted. 
     The motor  434  rotates the timing belt  433  via the drive pulley  4321 . When the timing belt  433  rotates, the two screw shafts  4311  rotate at the same time via each of the two driven pulleys  4322 . As a result, the recording unit  42  moves in the vertical direction while maintaining the horizontal position. 
       FIG. 11  illustrates a state in which the recording unit  42  is arranged at the ink ejection position at the lower end. On the other hand,  FIGS. 12 and 13  illustrate a state in which the recording unit  42  is raised by the vertical drive unit  43 , for example, for maintenance. In this way, the vertical drive unit  43  moves the recording unit  42  in the vertical direction. 
     As illustrated in  FIGS. 2, 4, 5, and 6 , the maintenance unit  44  is arranged below the frame unit  41 . The maintenance unit  44  is individually supported by the front wall portion  411  and the back wall portion  412  at each of both end portions in the paper width direction Dw. The maintenance unit  44  is arranged so as to be movable in the horizontal direction above the first belt conveying unit  31 . 
     The maintenance unit  44  performs maintenance on the ink ejection surface  421   a  of the recording head  421  in which the ink ejection nozzles  4211  open. During maintenance, the recording unit  42  moves upward. The maintenance unit  44  includes a cap unit  441  and a cleaning unit  442 . 
     During maintenance, the cap unit  441  is on the upstream side in the paper conveying direction Dc, and moves horizontally below the recording unit  42  that has moved upward. The cap unit  441  is attached to the lower side of the recording head  421  and is used for capping the ink ejection surface  421   a.  By performing capping of the ink ejection surface  421   a,  it is possible to suppress drying and solidification of the ink. 
     During maintenance, the cleaning unit  442  is on the upstream side in the paper conveying direction Dc, and moves horizontally below the recording unit  42  that has moved upward. The cleaning unit  442  presses a wiper member into contact with the ink ejection surface  421   a  of the recording head  421 . The cleaning unit  442  moves the wiper member in the paper width direction Dw and performs cleaning of the ink ejection surface  421   a.  By performing cleaning of the ink ejection surface  421   a,  solidified ink and other foreign substances adhering to the ink ejection surface  421   a  may be removed. 
     As illustrated in  FIG. 4 , the conveying direction drive unit  45  is provided in the frame unit  41 . The conveying direction drive unit  45  moves the maintenance unit  44  in the paper conveying direction Dc along the conveying direction guide member  416  below the recording unit  42  that has been moved upward. 
     More specifically, the conveying direction drive unit  45  individually moves each of the cap unit  441  and the cleaning unit  442  along the paper conveying direction Dc below the recording unit  42  that has been moved upward. As in the case of the vertical drive unit  43 , the conveying direction drive unit  45  includes a ball screw unit, a pulley, a timing belt, and a motor for individually moving the cap unit  441  or the cleaning unit  442 . 
     The front wall portion  411  and the back wall portion  412  of the frame unit  41  are arranged at each of both end portions in the paper width direction Dw of the recording unit  42  and the maintenance unit  44 . The front wall portion  411  and the back wall portion  412  support the recording unit  42  and the maintenance unit  44 . 
     In the present embodiment, the front wall portion  411  includes a cutout portion  4111  as illustrated in  FIGS. 3 and 13 . Note that the cutout portion  4111  may be provided on at least one of the front wall portion  411  and the back wall portion  412 . In other words, the cutout portion  4111  may be provided on the back wall portion  412 , or may be provided on both the front wall portion  411  and the back wall portion  412 . 
     The cutout portion  4111  is formed on the lower side of the back wall portion  412  or the front wall portion  411 , or in other words, on the first belt conveying unit  31  side in the vertical direction. Moreover, the cutout portion  4111  is formed in the vicinity of the upper surface of the first belt conveying unit  31  along the paper conveying direction Dc. The cutout portion  4111  has a substantially rectangular shape when viewed from the front, for example. 
     With configuration described above, when a hand is put through the cutout portion  4111  of the front wall portion  411 , the hand is able to reach the first belt conveying unit  31  in the vicinity of the recording unit  42 . Therefore, it is possible to easily access the first belt conveying unit  31  in the vicinity of the recording unit  42  having the recording head  421 . That is, in a case where a paper jam occurs in the vicinity of the recording unit  42 , the jam can be easily treated. 
       FIG. 4  illustrates the state at the time of recording. In other words, the recording unit  42  is moved downward by the vertical drive unit  43 . In addition, the maintenance unit  44  is moved by the conveying direction drive unit  45  to a position different from that of the recording unit  42  in the conveying direction. In this state, the lower end of the maintenance unit  44  is located above the lower end of the recording unit  42 . In other words, the gap existing above the first belt conveying unit  31  located below the maintenance unit  44  is larger in the vertical direction than the gap existing above the first belt conveying unit  31  located below the recording unit  42 . With this configuration, when performing the treatment of a jam in a state at the time of recording, it is possible to put a hand in the large gap under the maintenance unit  44 . Therefore, it is possible to easily access the first belt conveying unit  31  in the vicinity of the recording unit  42 . 
     As shown in  FIGS. 3, 4, and 5 , the cutout portion  4111  is arranged in a downstream portion in the paper conveying direction Dc of the front wall portion  411 . Note that the recording unit  42  is arranged on the first belt conveying unit  31  side in an upstream portion in the paper conveying direction Dc side of the front wall portion  411 . The cutout portion  4111  has a portion located below the maintenance unit  44 . With this configuration, the cutout portion  4111  serves as an opening to the space provided below the maintenance unit  44  in the frame unit  41 . Therefore, a hand can be easily inserted in the vicinity of the recording unit  42  to access the belt of the first belt conveying unit  31 . In other words, it is possible to easily remove the jammed paper in the vicinity of the recording unit  42 . 
     Note that the recording unit  42  may freely connected to and disconnect from each of the vertical guide member  415  and the ball screw unit  431  at both end portions in the paper width direction Dw. In other words, the recording unit  42  may be attached to or removed from the frame unit  41  and the vertical drive unit  43 . With this configuration, the recording unit  42  may be removed from the frame unit  41  and the vertical drive unit  43 . As a result, the first belt conveying unit  31  may be easily accessed even below the recording unit  42 . In other words, even in a case where a paper jam occurs below the recording unit  42 , treatment of jam may be easily performed. 
     Moreover, the recording unit  4  includes a recording unit  42 , a maintenance unit  44 , a frame unit  41 , a vertical drive unit  43 , and a conveying direction drive unit  45 , and records a monochromatic image. The recording unit  42  ejects a single color of ink. The maintenance unit  44  performs maintenance on the recording unit  42 . The frame unit  41  supports the recording unit  42  and the maintenance unit  44 . The vertical drive unit  43  moves the recording unit  42  in the vertical direction. The conveying direction drive unit  45  moves the maintenance unit  44  along the paper conveying direction Dc. In the present embodiment, six recording units  4  are arranged side-by-side above the first belt conveying unit  31  along the paper conveying direction Dc corresponding to each of the six colors. 
     With this configuration, the frame unit  41 , the recording unit  42 , the vertical drive unit  43 , the maintenance unit  44 , and the conveying direction drive unit  45  are individually grouped for each of a plurality of colors. As a result, they configure a recording unit  4 . A cutout portion  4111  is individually formed in all recording units  4 . In other words, in each of the plurality of recording units  4 , it is possible to easily access the first belt conveying unit  31  in the vicinity of the recording unit  42 . That is, in a case where a paper jam occurs in the vicinity of the recording unit  42  of each of the plurality of recording units  4 , the treatment of the jam may be performed individually. 
     Moreover, the frame unit  41 , the recording unit  42 , the vertical drive unit  43 , the maintenance unit  44 , and the conveying direction drive unit  45  may be unitized for each color. As a result, in a case where a problem occurs due to, for example, a paper jam or the like, the unit may be replaced. Therefore, in the inkjet recording apparatus  1 , maintainability may be improved and it is possible to reduce downtime. 
     To summarize the above, in a typical technique, a front plate and a rear plate of the housing are provided in front of and behind a housing that supports the raising/lowering unit having a line head group. In front of and behind these are both end portions in the paper width direction. For this reason, it is not possible to easily access the conveying unit of the recording medium in the vicinity of the line head group. As a result, in a case where a recording medium is jammed in the vicinity of the line head group, it may not be possible to easily handle the jam. 
     In view of the above points, an object according to the present disclosure is to provide an inkjet recording apparatus in which it is possible to easily access a conveying unit of a recording medium in the vicinity of a recording unit having a recording head. 
     More specifically, with the configuration according to the present disclosure, when a hand is put through the cutout portion of the wall portion, the hand is able to reach the conveying unit of the recording medium in the vicinity of the recording unit. Therefore, it is possible to easily access the conveying unit of the recording medium in the vicinity of the recording unit having the recording head. In other words, in a case where a jam of a recording medium occurs in the vicinity of the recording unit, treatment of the jam may be easily performed. 
     Embodiments according to the present disclosure have been described above; however, the scope of the present disclosure is not limited to this, and various modifications may be made without departing from the gist of the invention. 
     As industrial applicability, the technique according to the present disclosure may be used in an inkjet recording apparatus.