JP2013035237A - Inkjet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inkjet recording apparatus capable of preventing pullback of ejected ink into a nozzle, and remarkably reducing time required for recovery of a recording head.SOLUTION: When performing recovery operation of a recording head 13, ink 22 in a cylinder 21a is supplied to the recording head 13 through a second supply path 25 by pressurizing a syringe pump 21 while an inflow-side valve 27 is closed. The supplied ink 22 is forcibly purged to an ink ejection surface 13a from an ink ejection nozzle 15. By this purging operation, thickened ink, foreign matter and bubbles in the ink ejection nozzle 15 are discharged. Next, while an outflow-side valve 29 is closed and the inflow-side valve 27 is opened, wiping of the ink 22 ejected to the ink ejection surface 13a by a wiper 30 and refilling of the ink 22 into the syringe pump 21 are performed at the same time.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus that performs recording by ejecting ink onto a recording medium such as paper in a recording apparatus such as a facsimile, a copying machine, and a printer, and particularly relates to recovery of a recording head that ejects ink. It is.

  Recording devices such as facsimiles, copiers, and printers are configured to record images on recording media such as paper, cloth, and OHP sheets. However, depending on the recording method, inkjet, wire dot, thermal It can be classified into formulas and the like. These recording methods can be further classified into a serial type in which recording is performed while the recording head scans the recording medium, and a line head type in which recording is performed by a recording head fixed to the apparatus main body.

  For example, in a line head type ink jet recording apparatus, each of the line heads having a recording area equal to or larger than the width of the recording medium while conveying the recording medium such as paper at a high speed by a conveying means such as a conveying belt provided in the apparatus main body. An image is formed on the recording medium by ejecting ink from the ink ejection nozzle. This enables high-speed printing as compared with a serial type ink jet recording apparatus in which the recording head reciprocates in the width direction of the recording medium.

  In such an ink jet recording apparatus, in general, in order to prevent clogging in an ink ejection nozzle of a recording head, the recording head is recovered (maintenance) by discharging thickened ink, foreign matter, bubbles, or the like in the nozzle. ) It is necessary to perform an operation. As a method for recovering the recording head, the ink tank is connected to the reciprocating pump and the ink discharge nozzle with a pipe, and the ink in the ink discharge nozzle is pressurized from the ink supply side and forcibly discharged using the reciprocating pump. Along with (purge), a method of wiping the ink discharged on the ink ejection surface with a wiper (wiping) is used.

  Specifically, the valve on the inflow side (ink tank side) of the reciprocating pump is closed (first step), and pressure is applied to the ink on the outflow side (nozzle side) by the pump to remove thickened ink and foreign matter in the nozzle. Discharge (second step). Next, the inflow side and outflow side valves are opened to return to the normal state (third step), and a wiping operation for wiping the nozzle surface with a wiper is performed (fourth step). Thereafter, the valve on the outflow side is closed (fifth step), the pump is pulled back, and the pump is refilled with ink (sixth step). Finally, the valve on the outflow side is opened to return to the normal state (seventh step).

  However, in the above procedure, after the pressurization by the pump, the wiping operation is performed in a state where both the inflow side and the outflow side valves are open, so that the negative pressure due to the water head difference between the ink tank and the nozzle surface is generated in the recording head. As a result, there is a problem in that the thickened ink or foreign matter discharged outside the nozzle is pulled back into the nozzle by capillary action.

  As a method for preventing the thickened ink discharged from the nozzles or foreign matter from being drawn into the nozzles, for example, Patent Document 1 discloses a supply path for supplying ink to the nozzles of the recording head during the cleaning operation of the recording head. Recording is performed in a state in which the ink is pressurized and the ink overflows from the nozzle, the second step in which the pressurization is stopped after the first step, and a negative pressure is not applied to the ink in the nozzle after the second step. An ink jet recording apparatus is disclosed that performs a third step of wiping the nozzle surface of the head and a fourth step of forming a meniscus by applying a negative pressure to the ink of the nozzle after the third step.

JP 2011-5672 A

  According to the method of Patent Document 1, since the wiping operation is performed in a state where no negative pressure is applied to the nozzle, the ink is prevented from being pulled back into the nozzle. However, particularly in the case of a line head type recording head, the amount of ink ejected is larger than that of a serial type recording head, so that it takes time to fill the ink. Will be required. Therefore, since it is necessary to sequentially perform the first to seventh steps, there is a problem that it takes time to recover the recording head. In this respect, the method of Patent Document 1 is similar to the conventional method in that it takes time to recover the recording head, and development of a method for quickly and effectively performing the recovery operation of the recording head has been an issue.

  In view of the above problems, an object of the present invention is to provide an ink jet recording apparatus that can prevent the ejected ink from being pulled back into the nozzles and that can significantly reduce the time required to recover the recording head.

  In order to achieve the above object, the present invention provides an ink tank for storing ink ejected on a recording medium, a recording head having an ejection nozzle for ejecting ink on the recording medium, the recording head, and the ink tank. A reciprocating pump provided between the reciprocating pump and the ink tank, a second supply path connecting the reciprocating pump and the recording head, and the first supply. An ink jet recording apparatus comprising: an inflow side valve that opens or closes a path; an outflow side valve that opens or closes the second supply path; and a wiper that wipes an ink discharge surface of the recording head. The movement of ink from the reciprocating pump in the path to the ink tank is restricted, and the movement of ink from the reciprocating pump in the second supply path to the recording head is allowed. An ink discharge step of discharging ink from the discharge nozzle by applying pressure using the reciprocating pump in a state, and allowing ink to move from the ink tank in the first supply path to the reciprocating pump; The ink is refilled from the ink tank to the reciprocating pump in a state in which the movement of ink from the recording head to the reciprocating pump in the second supply path is restricted, and the wiper is used to refill the recording head. A wiping / refilling step of wiping off the ink discharge surface is capable of performing a recovery operation of the recording head.

  According to the present invention, in the ink jet recording apparatus configured as described above, the wiping / refilling step is an operation having a longer duration of the refilling operation of the ink to the reciprocating pump and the wiping operation of the ink ejection surface. It is characterized in that the operation with the shorter duration is started and completed between the start and the end of.

  According to the present invention, in the ink jet recording apparatus having the above configuration, when the continuation time of the wiping operation of the ink discharge surface is longer than the continuation time of the ink refilling operation to the reciprocating pump, The duration of the ink refilling operation is extended in accordance with the duration of the wiping operation of the ink ejection surface.

  According to the present invention, in the ink jet recording apparatus configured as described above, at least one of the inflow side valve and the outflow side valve allows the ink to pass in a direction from the ink tank to the recording head, and the recording It is a check valve that restricts the passage of the ink in the direction from the head toward the ink tank.

  According to the first configuration of the present invention, the wiping of the ink ejection surface that requires the most time in the recovery operation sequence of the recording head and the refilling of the reciprocating pump are performed in parallel. Time can be shortened. In addition, after the ink is discharged by pressurizing the reciprocating pump, wiping is performed with the outflow side valve closed, so that a negative pressure due to the water head difference between the nozzle surface of the discharge nozzle and the ink tank is applied to the recording head. In addition, there is no possibility that the thickened ink or foreign matter discharged from the discharge nozzle is pulled back into the discharge nozzle.

  According to the second configuration of the present invention, in the ink jet recording apparatus having the first configuration, the wiping / refilling step includes an ink refilling operation for the reciprocating pump and a wiping operation for the ink ejection surface. By starting and completing the operation with the shorter duration between the start and completion of the operation with the longer duration, the execution time of the wiping / refilling process is the ink refilling operation and the ink ejection. It becomes equal to the longer one of the surface wiping operations. Therefore, the time required for recovery of the recording head can be shortened as much as possible.

  According to the third configuration of the present invention, in the inkjet recording apparatus having the second configuration, when the duration of the wiping operation of the ink discharge surface is longer, the refilling duration of the reciprocating pump is increased. By extending in accordance with the duration of the ink surface wiping operation, the generation of bubbles in the ink can be suppressed without increasing the total time required for recovery of the recording head.

  According to the fourth configuration of the present invention, in the ink jet recording apparatus having any one of the first to third configurations, at least one of the inflow side valve and the outflow side valve is directed from the ink tank toward the recording head. Opening and closing of the inflow and outflow valves during the recovery operation of the print head by using a check valve that allows the ink to pass through the print head and restricts the passage of ink in the direction from the print head toward the ink tank Since control becomes unnecessary, the recovery operation procedure of the recording head can be simplified.

1 is a side view schematically showing a schematic structure of an inkjet recording apparatus 100 of the present invention. FIG. 1 is a plan view of the ink jet recording apparatus 100 shown in FIG. 1 as viewed from above. 1 is a schematic diagram illustrating an ink flow path from an ink tank 20 to a recording head 13 of the inkjet recording apparatus 100 according to the first embodiment of the present invention. The figure which shows typically the ink discharge process in the recovery operation of the recording head 13 The figure which shows typically the wiping and refilling process in the recovery operation of the recording head 13 The figure which shows typically the state which the wiping and refilling process in the recovery operation of the recording head 13 was complete | finished Flow chart showing the sequence of the recovery operation of the recording head 13 Schematic diagram showing the ink flow path from the ink tank 20 to the recording head 13 of the inkjet recording apparatus 100 according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of the ink jet recording apparatus of the present invention, and FIG. 2 is a plan view of the conveyance belt of the ink jet recording apparatus shown in FIG.

  As shown in FIG. 1, a paper feed tray 2 that accommodates paper P is provided on the left side of the inkjet recording apparatus 100, and one end of the paper feed tray 2 is accommodated in the paper feed tray 2. A paper feed roller 3 for transporting and feeding the paper P one by one from the uppermost paper P one by one to a later-described transport belt 5 and a driven roller 4 that is pressed against the paper feed roller 3 and driven to rotate are provided. ing.

  A transport belt 5 is rotatably disposed on the downstream side (right side in FIG. 1) of the paper feed roller 3 and the driven roller 4 with respect to the paper transport direction (arrow X direction). The conveying belt 5 is stretched between a belt driving roller 6 disposed on the downstream side in the sheet conveying direction and a belt roller 7 disposed on the upstream side and rotated by the belt driving roller 6 via the conveying belt 5. The belt P is conveyed in the direction of the arrow X by the belt driving roller 6 being rotated in the clockwise direction.

  Here, since the belt driving roller 6 is arranged on the downstream side in the paper transport direction X, the paper feed side (the upper side in FIG. 1) of the transport belt 5 is pulled by the belt drive roller 6. Therefore, the tension on the sheet feeding side can be increased, and the sheet P can be stably conveyed. In addition, a sheet made of dielectric resin is used for the transport belt 5, and a (seamless) belt mainly having no seam is used.

  Further, on the downstream side of the conveyance belt 5 with respect to the sheet conveyance direction, a discharge roller 8 that is driven clockwise in FIG. 1 and discharges the sheet P on which an image is recorded to the outside of the apparatus main body, A driven roller 9 that is in pressure contact with the driven roller 9 is provided, and a discharge tray 10 is provided on the downstream side of the discharge roller 8 and the driven roller 9 on which the paper P discharged outside the apparatus main body is stacked. ing.

  An image is recorded on the paper P that is supported above the conveyor belt 5 at a height such that a predetermined interval is formed with respect to the upper surface of the conveyor belt 5. Line heads 11C, 11M, 11Y and 11K are disposed. Each of the line heads 11C to 11K is supplied with four colors (cyan, magenta, yellow, and black) of ink stored in an ink tank 20 (see FIG. 3) by a syringe pump 21 (see FIG. 3). A color image is formed on the paper P by ejecting the respective inks from the line heads 11C to 11K.

  As shown in FIG. 2, these line heads 11 </ b> C to 11 </ b> K have a plurality of (in this case, three) recording heads 13 arranged in a staggered manner in a direction orthogonal to the paper conveyance direction, and the width of the paper P being conveyed. Having the above recording area, the image for one line can be recorded collectively on the paper P conveyed on the conveying belt 5. In addition, each recording head 13 is arranged so that a part of the ink discharge nozzles 15 provided in each recording head 13 overlap in the transport direction.

  As the ink ejection method of the line heads 11C to 11K, for example, a piezo method that pushes out ink using a piezo element (not shown), or a thermal ink jet method that generates air bubbles by a heating element and ejects ink by applying pressure. Various methods can be applied.

  The recording heads 13 of the line heads 11 </ b> C to 11 </ b> K eject ink from the recording head 13 toward the paper P placed on the surface of the transport belt 5 in accordance with image data information received from an external computer or the like. As a result, a color image is formed on the paper P on the transport belt 5 by superimposing four colors of ink of cyan, magenta, yellow, and black. The paper P on which the color image is formed is discharged to the discharge tray 10 provided outside the right side surface of the inkjet recording apparatus 100 via the discharge roller 8 and the driven roller 9.

  In addition, in order to prevent ink discharge failure due to drying or clogging of the recording head 13, the ink discharge amount is a specified value from all the recording heads 13 at the start of printing after a long-term stop and between printing operations. Ink with increased viscosity in the nozzle is ejected (purged) from the ink ejection nozzle 15 of the recording head 13 to prepare for the next printing operation.

  Next, ink supply from the ink tank 20 to the recording head 13 during printing and ink ejection from the recording head 13 during purging will be described. FIG. 3 is a diagram schematically showing an ink flow path from the ink tank 20 to the recording head 13 of the inkjet recording apparatus 100 according to the first embodiment of the present invention. Note that the ink flow paths shown in FIG. 3 are provided between the ink tanks 20 for the respective colors and the recording head 13, but here, the ink flow paths for any one color will be described.

  As shown in FIG. 3, a syringe pump 21 is disposed between the ink tank 20 and the recording head 13. The ink tank 20 and the syringe pump 21 are connected by a first supply path 23 made of a tube member, and the syringe pump 21 and the ink discharge nozzle 15 in the recording head 13 are connected by a second supply path 25 made of a tube member. Yes. In addition, a wiper 30 that is movable along the ink ejection surface 13a of the recording head 13 is provided.

  The first supply path 23 is provided with an inflow side valve 27, and the second supply path 25 is provided with an outflow side valve 29. By opening and closing the inflow side valve 27, the movement of ink in the first supply path 23 is permitted or restricted, and by opening and closing the outflow side valve 29, the movement of ink in the second supply path 25 is permitted or restricted. . 3 to 6, the open state of the inflow side valve 27 and the outflow side valve 29 is shown in white, and the closed state is shown in black.

  The syringe pump 21 includes a cylinder 21a and a piston 21b. The cylinder 21 a is connected to the first supply path 23 and the second supply path 25, and the ink 22 in the ink tank 20 flows into the cylinder 21 a through the first supply path 23. Further, the ink is discharged from the cylinder 21 a through the second supply path 25, and the discharged ink is supplied to the recording head 13.

  The piston 21b can be moved up and down by a drive device (not shown). A packing (not shown) such as an O-ring is mounted on the outer periphery of the piston 21b to prevent ink leakage from the cylinder 21a, and the piston 21b can slide smoothly along the inner peripheral surface of the cylinder 21a. It is like that.

  The wiper 30 moves from the wiping start position on one end side (right end in FIG. 3) of the ink discharge surface 13a to the other end side (left end in FIG. 3) while being pressed against the ink discharge surface 13a at a predetermined pressure. The ink ejected on the ink ejection surface 13a is wiped off. Thereafter, the wiper 30 once moves away from the ink discharge surface 13a in the reverse direction (from left to right in FIG. 3) and returns to the wiping start position again.

  During normal printing (during printing), as shown in FIG. 3, the inflow side valve 27 and the outflow side valve 29 are both open, and the piston 21b is stopped at a preset position so that the inside of the cylinder 21a Is filled with a substantially constant amount of ink. Ink is supplied from the cylinder 21 a to the recording head 13 by the surface tension (meniscus) between the cylinder 21 a and the recording head 13.

  Next, the recovery operation of the recording head 13 by the syringe pump 21 will be described. 4 to 6 are diagrams schematically showing each step during the recovery operation of the recording head 13, and FIG. 7 is a flowchart showing a sequence of the recovery operation of the recording head 13. The recovery operation procedure of the recording head 13 will be described along the steps of FIG. 7 with reference to FIGS.

  When the recovery operation of the recording head 13 is performed, first, in a state where printing is not performed by the recording head 13, the inflow side valve 27 is closed (step S1), and the movement of the ink in the first supply path 23 is blocked. . Next, the piston 21b is moved downward to pressurize the syringe pump 21 (step S2).

  At this time, a positive pressure is generated in the cylinder 21a, but the inflow side valve 27 is closed, and only the outflow side valve 29 is opened, so that the ink 22 in the cylinder 21a remains as shown in FIG. The recording head 13 is supplied through the second supply path 25. The supplied ink 22 is forcibly ejected (purged) from the ink ejection nozzle 15 onto the ink ejection surface 13a (ink ejection process). By this purge operation, the thickened ink, foreign matter, and bubbles in the ink discharge nozzle 15 are discharged, and the recording head 13 can be recovered.

  Next, the outflow side valve 29 is closed and the inflow side valve 27 is opened (step S3). In this state, as shown in FIG. 5, the wiper 30 wipes the ink 22 ejected onto the ink ejection surface 13a (wiping), and moves the piston 21b upward to refill the syringe pump 21 with the ink 22 Are simultaneously performed (step S4). The thickened ink or the like wiped off by the wiper 30 is collected in a disposal tank (not shown).

  Then, as shown in FIG. 6, when the wiping of the ink discharge surface 13a and the refilling of the syringe pump 21 (wiping / refilling process) are completed, the outflow side valve 29 is opened (step S5) and the wiper 30 is wiped off. Return to position. As a result, the recovery operation of the recording head 13 is completed, and the printable state shown in FIG. 3 is restored.

  By performing the recovery operation of the recording head 13 according to the above procedure, the wiping of the ink ejection surface 13a and the refilling of the syringe pump 21 that require the most time in the recovery operation sequence can be performed in parallel. Accordingly, it is possible to shorten the time required for recovery of the line head type recording head 13 which requires a long time for ink filling, requires a long wiping area, and requires a long time for the wiping operation.

  Further, since the wiping is performed after the syringe pump 21 is pressurized to discharge the ink 22 and the outflow side valve 29 is closed, the negative pressure due to the water head difference between the nozzle surface of the ink discharge nozzle 15 and the ink tank 20 is reduced. It does not hook into the recording head 13. Therefore, there is no possibility that the thickened ink or foreign matter discharged from the ink discharge nozzle 15 is pulled back into the ink discharge nozzle 15.

  In step S4, the time required for wiping the ink discharge surface 13a and the time required for refilling the syringe pump 21 are not the same. Therefore, of the two operations, the operation having the shorter duration is executed from the start to the completion of the operation having the longer duration.

  For example, when the time required for refilling the syringe pump 21 is longer, wiping of the ink ejection surface 13a and refilling of the syringe pump 21 are started simultaneously, and before the refilling of the syringe pump 21 is completed, the ink ejection surface The wiping operation 13a is completed. Alternatively, wiping of the ink discharge surface 13a is started after refilling of the syringe pump 21 is started, and before the refilling of the syringe pump 21 is completed or simultaneously with the completion of refilling of the syringe pump 21, the ink discharge surface 13a. Complete the wiping operation. In this way, the execution time of the wiping / refilling process becomes equal to the longer one of the wiping operation or the refilling operation, and the time required for the wiping / refilling process can be shortened as much as possible.

  By the way, if the rising speed of the piston 21b is increased in order to quickly refill the syringe pump 21, there is a problem that bubbles are likely to be generated in the ink. Therefore, if the time required for wiping the ink discharge surface 13a is longer, the wiping of the ink discharge surface 13a and the refilling of the syringe pump 21 are started at the same time, and the rising speed of the piston 21b is slowed to reduce the ink discharge surface 13a. It is preferable to complete the refilling of the syringe pump 21 simultaneously with the completion of the wiping operation. Thus, when the time required for wiping is longer, the refilling of the syringe pump 21 is performed slowly in accordance with the wiping, thereby increasing the total time required for the recovery of the recording head 13. And the generation of bubbles in the ink can be suppressed.

  FIG. 8 is a diagram schematically showing an ink flow path from the ink tank 20 to the recording head 13 of the inkjet recording apparatus 100 according to the second embodiment of the present invention. In the present embodiment, the inflow side valve 27 disposed in the first supply path 23 allows ink to move from the ink tank 20 side to the syringe pump 21 side, and ink from the syringe pump 21 side to the ink tank 20 side. It is a check valve that regulates the movement of the valve. Similarly, the outflow side valve 29 disposed in the second supply path 25 allows the ink to move from the syringe pump 21 side to the recording head 13 side, and the ink moves from the recording head 13 side to the syringe pump 21 side. It is a check valve that regulates

  According to this configuration, since the opening / closing control of the inflow side valve 27 and the outflow side valve 29 (steps S1, S3, and S5 in FIG. 7) during the recovery operation of the recording head 13 is not required, compared to the first embodiment. The recovery operation procedure of the recording head 13 can be simplified. Although both the inflow side valve 27 and the outflow side valve 29 are check valves here, either the inflow side valve 27 or the outflow side valve 29 may be a check valve.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above embodiments, the ink is supplied to the recording head 13 at the time of printing using the syringe pump 21. However, the ink supply method at the time of printing can supply ink from the ink tank 20 to the recording head 13. If it is, it will not specifically limit. For example, a third supply path that connects the ink tank 20 and the recording head 13 without passing through the syringe pump 21 may be provided, and ink may be supplied from the ink tank 20 to the recording head 13 using the third supply path. .

  Further, the number of ink discharge nozzles 15 and the nozzle interval of the recording head 13 can be appropriately set according to the specifications of the ink jet recording apparatus 100. Further, the number of the recording heads 13 is not particularly limited. For example, one recording head 13 can be arranged for each of the line heads 11C to 11K.

  The present invention is applicable to an ink jet recording apparatus that performs recording by ejecting ink from a recording head. By utilizing the present invention, the time required for recovery of the recording head can be shortened, so that the ink jet recording apparatus is excellent in usability with a short waiting time for the user. In addition, the ink jet recording apparatus can prevent clogging of the ink discharge nozzles and defective printing due to re-inhalation of thickened ink discharged from the ink discharge nozzles or foreign matters.

13 Recording head 15 Ink discharge nozzle 20 Ink tank 21 Syringe pump (reciprocating pump)
21a Cylinder 21b Piston 22 Ink 23 First supply path 25 Second supply path 27 Inflow side valve 29 Outflow side valve 30 Wiper 100 Inkjet recording apparatus

Claims (4)

An ink tank for storing ink ejected on the recording medium;
A recording head having an ejection nozzle that ejects ink on the recording medium; and
A reciprocating pump provided between the recording head and the ink tank;
A first supply path connecting the reciprocating pump and the ink tank;
A second supply path connecting the reciprocating pump and the recording head;
An inflow valve for opening or closing the first supply path;
An outflow side valve for opening or closing the second supply path;
A wiper that wipes off the ink ejection surface of the recording head;
In an inkjet recording apparatus comprising:
The movement of the ink from the reciprocating pump in the first supply path to the ink tank is restricted, and the movement of the ink from the reciprocating pump in the second supply path to the recording head is allowed. An ink discharge step of discharging ink from the discharge nozzle by pressurizing using a reciprocating pump;
The ink is allowed to move from the ink tank in the first supply path to the reciprocating pump, and the ink movement from the recording head to the reciprocating pump in the second supply path is restricted. Wiping and refilling step of refilling the ink from the ink tank to the reciprocating pump and wiping the ink discharge surface of the recording head using the wiper;
An ink jet recording apparatus capable of executing a recovery operation of the recording head including:   The wiping / refilling step has a shorter duration between the start and completion of the operation with the longer duration of the refilling operation of the ink to the reciprocating pump and the wiping operation of the ink ejection surface. The inkjet recording apparatus according to claim 1, wherein the operation is started and completed.   When the duration of the wiping operation of the ink ejection surface is longer than the duration of the ink refilling operation to the reciprocating pump, the duration of the ink refilling operation to the reciprocating pump is set as the duration of the ink ejection surface. The ink jet recording apparatus according to claim 2, wherein the ink jet recording apparatus is extended according to a duration of the wiping operation.   At least one of the inflow side valve or the outflow side valve allows the ink to pass in the direction from the ink tank toward the recording head, and allows the ink in the direction from the recording head to the ink tank. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is a check valve that restricts passage.

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