JP2019084751A - Moisturizing method of ink head - Google Patents

Abstract

To provide a moisturizing technique of an ink head for moisturizing a discharge port of the ink head.SOLUTION: The present invention relates to a moisturizing method of an ink head for moisturizing a discharge port (22a) of an ink head (22) used for an ink jet printer (10). The moisturizing method includes: an ink suction step for sucking at least a part of residual ink in the ink head (22) from the discharge port (22a); and a moisturizing step for immersing the discharge port (22a) in moisturizer after the ink is sucked. More preferably, the moisturizing method includes a sweeping step for sweeping the moisturizer adhered to a circumference of the discharge port (22a).SELECTED DRAWING: Figure 8

Description

  The present invention relates to a method of moisturizing an ink head, which moisturizes the discharge port of an ink head used in an ink jet printer.

  As disclosed in Patent Document 1, there is known an ink jet printer provided with an ink head for ejecting ink.

  In the ink jet printer, the recording medium is fed in the front-rear direction, and an ink head for discharging the ink onto the recording medium is provided movably to the left and right. The ink head is provided with a discharge port that faces the recording medium and discharges the ink.

JP 2017-71135 A

  In general, it is desired that a printer can print on many recording media in a short time. In order to satisfy this requirement, the ink used in the ink jet printer is preferably one that dries quickly. On the other hand, when the ink that dries quickly is adopted, the dried ink may easily adhere to the periphery of the discharge port. In order to suppress the adhesion of the ink, for example, it is desirable to keep the discharge port moist while the ink jet printer is not used.

  An object of the present invention is to provide an ink head moisturizing technique for moisturizing the discharge port of the ink head.

According to the present invention, there is provided a method of moisturizing an ink head, which moisturizes the discharge port of the ink head used in the ink jet printer.
An ink suction step of suctioning at least a portion of the ink remaining in the ink head from the discharge port;
And a moisturizing step of immersing the discharge port in a moisturizing liquid after the ink is sucked.

  After the ink is sucked, the discharge port is dipped in the moisturizer. By suctioning the ink from the discharge port, it becomes easy to contain the moisturizing liquid from the discharge port to the ink head. In addition, by sucking ink in advance, it is difficult for the moisturizing liquid to drip from the vicinity of the discharge port. The moisturizing liquid can be more reliably left on the periphery of the discharge port, and can effectively moisturize.

FIG. 1 illustrates a printer that can use a method according to an embodiment of the present invention. FIG. 2 is a view for explaining the details of a printer shown in FIG. 1; Figure 3 is a cross-sectional view of the cap shown in Figure 2; FIG. 3 is a cross-sectional view of the moisturizing part shown in FIG. FIG. 3 is an operation diagram illustrating cleaning of the print head shown in FIG. 2; FIG. 3 is an operation diagram for explaining moisture retention of the print head shown in FIG. 2; FIG. 3 is an operation diagram illustrating wiping of the print head shown in FIG. 2; It is a figure explaining the effect of the cleaning shown by FIG. It is a figure explaining the moisturizing effect shown by FIG. It is a figure explaining the modification of the moisture retention method shown by FIG.

Embodiments of the present invention will be described below based on the attached drawings. In the description, left and right refer to the left and right with reference to the drawings, and front and back refer to the front and back with respect to the media feeding direction. Also, in the figure, Fr indicates before, Rr indicates after, Le indicates left, Ri indicates right, Up indicates up, and Dn indicates down.
<Example>

  Please refer to FIG. 1 (a). FIG. 1 (a) is a perspective view of an ink jet printer in which the method according to the invention is used. The ink jet printer 10 is a large ink type printer capable of forming a color image on the medium Me. The ink jet printer 10 prints, for example, a large signboard and a poster.

  The ink jet printer 10 has a transport device 12 mounted on the top of the base 11 to transport the media Me, and a printing device 20 provided so as to straddle the transport device 12 to print on the media Me. . The ink jet printer 10 prints on the media Me passing through the printing device 20 while sending the media Me forward by the transport device 12.

  In addition to the transport device 12 and the printing device 20, the inkjet printer 10 can be mounted with any device such as a cutter device for cutting the medium Me.

  The media Me is, for example, a roll media wound on a roll, and the material of the media may be paper such as plain paper, or resin such as polyvinyl chloride or polyester, and aluminum It may be a metal, such as a material or an iron material, and can be composed of various materials. The medium Me is sent by the transport device 12 from the rear to the front.

  Please refer to FIG. 1 (b). FIG. 1B is a view schematically showing the printing apparatus. The printing apparatus 20 includes an ink cartridge 21 filled with ink, an ink head 22 which supplies the ink from the ink cartridge 21 and discharges the ink to the medium Me, and sends the ink from the ink cartridge 21 to the ink head 22. Main components including an ink tube 23 which can be connected, a liquid feed pump 24 provided on the ink tube 23 for sending ink to the ink head 22, and a cleaning unit 25 for cleaning and moisturizing the ink head 22. Do.

  The printing apparatus 20 further includes a processing unit 26, a storage unit 27, and a communication unit 28. The processing unit 26, the storage unit 27, and the communication unit 28 are configured by, for example, a microcomputer or a microcontroller. The processing unit 26, the storage unit 27, and the communication unit 28 can include, for example, a CPU (or MPU or MCU), a ROM, a RAM, and an input / output interface. For example, the ROM can store a program that causes the CPU to execute a predetermined operation. The RAM can form a work area of the CPU. The processing unit 26, the storage unit 27, and the communication unit 28 may be configured by an ASIC, an FPGA, or the like.

  The printing apparatus 20 includes an operation panel 31 as an operation unit that can be operated by the user, and a control unit 32 shown in FIG. The operation panel 31 has operation buttons such as a power button and a setting button, operation switches, and the like. The control unit 32 will be described later.

  The ink cartridge 21 is composed of a plurality of (for example, four) cartridges. These cartridges include a cyan cartridge 21C filled with cyan ink, a magenta cartridge 21M filled with magenta ink, a yellow cartridge 21Y filled with yellow ink, and a black cartridge 21K filled with black ink. Become.

  The number and color of the cartridges constituting the ink cartridge 21 can be arbitrarily selected. The ink filled in the ink cartridge 21 is preferably an aqueous resin ink excellent in the fixability to the medium. In order to perform many printings in a short time, it is also preferable to select an ink excellent in quick drying. Besides these, any water-based ink or organic solvent-based ink can be selected.

  The ink head 22 is provided movably on the rail 13 extending in the left-right direction. The ink head 22 is constituted by heads 22C, 22M, 22Y and 22K corresponding to the cartridges 21C, 21M, 21Y and 21K, respectively. That is, the ink head 22 includes a cyan head 22C for ejecting cyan ink, a magenta head 22M for ejecting magenta ink, a yellow head 22Y for ejecting yellow ink, and a black head 22K for ejecting black ink. It consists of

  Hereinafter, the black cartridge 21K and the black head 22K will be described as an example. The basic configuration is the same for other colors, and rereading can be performed as appropriate, so detailed description will be omitted.

  Please refer to FIG. 2 (a) and FIG. 2 (b). FIG. 2A is a view schematically showing the main part of the printing apparatus. FIG.2 (b) is a 2b arrow line view of Fig.2 (a). The black head 22K (ink head 22) has a plurality of discharge ports 22a for discharging ink. The discharge port 22a is opened to the discharge surface 22b.

  The cleaning unit 25 includes an ink suction unit 40 capable of suctioning ink in the black head 22K, a moisturizing unit 50 filled with a moisturizing liquid for moisturizing the ejection port 22a, and a wiping unit 60 capable of wiping the ejection surface 22b. And.

  The ink suction unit 40 is connected to the suction pump 41 capable of suctioning the ink in the black head 22K, the cap 42 connected to the suction pump 41 and capable of covering the ejection surface 22b, and the suction pump 41 And a waste tank 43 in which the ink is discarded.

  Please refer to FIG. The cap 42 has a cap body 42 a that can be in close contact with the tip of the black head 22 K, and a connection pipe 42 b extending from the cap body 42 a to the suction pump 41. A seal member 42c is provided on the inner periphery of the cap body 42a. The cap 42 is provided to be able to move up and down. When the black head 22K is located at the upper side, the cap 42 can be brought into close contact with the black head 22K by raising the cap 42.

  Please refer to FIG. The moisturizing unit 50 includes, for example, a moisturizing container 51 filled with moisturizing liquid Mo and having an open upper surface, and a sponge 52 disposed in the moisturizing container 51 and dipped in the moistening liquid Mo. The moisturizing unit 50 is provided to be able to move up and down. If the moisturizing portion 50 is raised when the black head 22K is positioned above, the ejection surface 22b of the black head 22K can be immersed in the moisturizing liquid.

  Moisturizer Mo is Roland Dey. G. A trade name CJ-CL manufactured by Co., Ltd. can be adopted. In addition to this, any moisturizing liquid can be adopted as long as it can suppress the drying of the discharge port.

  Refer to FIG. 2 (a). The wiping portion 60 is configured such that a rubber wiper 62 is supported by the wiper support portion 61. The wiping unit 60 is provided to be able to move up and down. By moving the black head 22K to the left and right with the wiper 62 facing on the track of the black head 22K, the wiper 62 abuts on the discharge surface 22b and wipes the ink attached to the discharge surface 22b or the discharge port 22a it can.

  The control unit 32 can transmit an electrical signal to the liquid feed pump 24, the ink head 22, the suction pump 41, the cap 42, the moisturizing unit 50, and the wiping unit 60. The control unit 32 operates the liquid feed pump 24, moves the ink head 22 in the left-right direction and discharges the ink, operates the suction pump 41, raises and lowers the cap 42, raises and lowers the moisturizing unit 50, and raises and lowers the wiping unit 60. Control.

  A method of cleaning the ink jet printer 10 having the above configuration and a method of moisturizing will be described.

  For example, when a shutdown operation of the ink jet printer 10 is performed, cleaning and moisturizing operations of the ink head 22 are started.

  First, the control unit 32 moves the ink head 22 to the upper side of the cap 42. Next, the control unit 32 lifts the cap 42 and stops the lifting of the cap 42 at a position immediately before the cap 42 adheres to the ink head 22. That is, the cap 42 is moved to the vicinity of the ink head 22 (cap preparation step).

  Next, the control unit 32 operates the liquid feeding pump 24 to send the ink to the ink head 22 (pressure step). By sending the ink, the inside of the ink head 22 is pressurized. In the pressurizing step, the inside of the ink head 22 is pressurized to, for example, 3 kPa. The control unit 32 operates the suction pump 41 at the same time as pressurizing. When the ink is dropped from the discharge port 22 a and dropped to the cap 42, the ink dropped to the cap 42 is suctioned. At this time, a gap is present between the cap 42 and the ink head 22. Therefore, only the dropped ink can be sucked, and the ink in the ink head 22 is not sucked.

  The amount of ink sent to the ink head 22 is an amount that can stay in the ink head 22 so that the ink does not drip from the discharge port 22 a. For example, 0.5 ml of ink is sent per nozzle row of the ink head 22. After sending a predetermined amount of ink, the control unit 32 stops the liquid feed pump 24 (pressure stop step). Thereby, the supply of the ink to the ink head 22 is stopped. The stop time is, for example, 5 seconds.

  In addition, means other than supply of the ink by the liquid feeding pump 24 may be employ | adopted for a pressurization process. For example, it is also possible to provide an air pump different from the liquid feed pump and to send air. The pressurizing step is not limited to these, and any means can be adopted.

  Please refer to FIG. After stopping the pressure application, the control unit 32 raises the cap 42 to bring the cap 42 into close contact with the ink head 22. Please refer to FIG. The ink remaining in the ink head 22 is sucked from the discharge port 22 a by bringing the cap 42 into close contact with the ink head 22 while the suction pump 41 is in operation (ink suction step). For example, in the suction process, the pressure in the ink head 22 is set to −1.0 kPa. The ink sucked from the ink head 22 is sent to the waste tank 43.

  After suctioning a predetermined amount of ink, the control unit 32 lowers the cap 42. Next, the control unit 32 operates the liquid feed pump 24, and sends the ink smaller than the ink sucked in the ink suction step to the ink head 22 (internal pressure adjustment step). For example, in the internal pressure adjustment step, the pressure in the ink head 22 is set to −0.6 to −0.7 kPa.

  Alternatively, when the predetermined amount of ink is suctioned, the control unit 32 operates the liquid feeding pump 24 to send to the ink head 22 less ink than that sucked in the ink suction step (internal pressure adjustment step). Next, the control unit 32 lowers the cap 42.

  The internal pressure of the ink head 22 after the ink suction process is higher than the internal pressure of the ink head 22 before the pressure process. Specifically, the pressure is preferably 0.2 kPa or more. Furthermore, the internal pressure of the ink head 22 after the ink suction step is lower than the atmospheric pressure. The internal pressure of the ink head 22 can be adjusted by the amount of ink sucked in the ink suction process and / or the amount of ink supplied in the internal pressure adjustment process. The reason for setting the internal pressure of the ink head 22 to a predetermined pressure will be described later.

  Please refer to FIG. The control unit 32 moves the ink head 22 to the upper side of the moisturizing unit 50. When the ink head 22 moves to the upper side of the moisturizing unit 50, the control unit 32 raises the moisturizing unit 50. The discharge port 22a (see FIG. 2) of the ink head 22 is dipped in the moisturizing liquid (moisturizing step). When the moisturizing liquid is immersed for a predetermined time, the control unit 32 lowers the moisturizing unit 50.

  The moisturizing process will be described in detail with reference to FIG. FIG. 8 is a diagram conceptually showing the state of the ink head after the suction step to the moisturizing step. Please refer to FIG. 8 (a) and FIG. 8 (b). 8A is a cross-sectional view of the ink head 22, and FIG. 8B is an enlarged view of a portion 8b of FIG. 8A. In the suction process, the ink In in the ink head 22 is sucked. In particular, the space Ga is easily formed in the vicinity of the discharge port 22a.

  FIG. 8C is a cross-sectional view for explaining the moisturizing step. FIG. 8D is a view conceptually showing the ink head after moisturizing. FIG. 8 (e) is an enlarged view of a portion 8e of FIG. 8 (d). Please refer to FIG. 8 (c). The discharge port 22 a is pressed against the sponge 52. Please refer to FIG. 8 (d) and FIG. 8 (e). A portion of the moisturizing liquid Mo filled in the sponge 52 is filled in the ink head 22. At this time, since the discharge port 22a of the ink head 22 has been subjected to the suction process, the moisturizing liquid Mo can be easily filled around the discharge port 22a. The moisturizer Mo filled from the discharge port 22a mixes with the ink In.

  Refer to FIG. 9 (a). The control unit 32 raises the wiping unit 60. The tip of the wiper 62 ascends to the left and right orbits of the ink head 22. Refer to FIG. 9 (b). The control unit 32 moves the ink head 22 until it passes the wiper 62. The tip of the wiper 62 abuts on the discharge surface 22b (see FIG. 2B) to wipe the moisturizing liquid attached to the periphery of the discharge port 22a (a wiping step).

  In the wiping step, the force for wiping the peripheral edge of the ejection opening 22a is set to be weaker than the force at which the ink attached to the peripheral edge of the ejection opening 22a is wiped. During normal printing, the ink adhering to the peripheral edge of the ejection opening 22 a is periodically wiped by the wiper 62. The force for wiping the periphery of the discharge port 22a in the wiping step is weaker than the force wiped by the wiper 62 at this time. The wiping force can be adjusted by the height of the tip of the wiper 62. That is, the wiping force is strong if the overlapping amount of the wipers 62 is large on the basis of the track of the ink head 22, and the wiping force is weak if the overlapping amount of the wipers 62 is small.

  Please refer to FIG. When the wiping process is completed, the control unit 32 moves the ink head 22 to the upper side of the cap 42 and raises the cap 42. The ink head 22 is stored in a state where the cap 42 is in close contact with the ink head 22 (storage step).

  It is also possible to wipe the peripheral edge of the discharge port 22a in advance (cleaning preparation step) to prepare for cleaning prior to the pressing step.

  Please refer to FIG. FIG. 10 is a figure for demonstrating the moisture retention method by the modification of this invention. The moisture retention part 50 and the wiping part 60 which were shown in FIG. 2 were integrated. The moisturizing and wiping unit 70, which integrally comprises the moisturizing part and the wiping part, is capable of pumping up the moisturizing liquid filled tank 71 filled with the moisturizing liquid and the moisturizing liquid filled in the moisturized liquid filling tank 71. A liquid supply pump 72 and a moisturizing and wiping unit 80 connected to the moisturizing liquid supply pump 72 and performing moisturizing and wiping are provided.

  The moisturizing and wiping unit 80 has a wiper support 81, a wiper 82 instructed by the wiper support 81, and a sponge 83 provided at the tip of the wiper 82. The tip of the sponge 83 is formed in a mountain shape whose center is the highest.

  A moisturizing fluid supply passage 84 through which the moisturizing fluid can pass is provided from the end of the wiper support portion 81 to the tip of the wiper 82. A sponge 83 is provided at the tip of the moisturizing fluid supply passage 84. The tip of the moisturizing fluid supply passage 84 is formed wider than other portions so as to be able to accommodate the sponge 83.

  When moisturizing the discharge port 22a, the control unit 32 raises the moisturizing and wiping unit 80 to the orbit of the ink head 22 (see FIG. 9A). Next, the control unit 32 moves the ink head 22 in the left-right direction (see FIG. 9B). The control unit 32 operates the moisturizing liquid supply pump 72 as the ink head 22 passes the tip of the wiper 62. The supplied moisturizer is supplied to the ink head 22 from a sponge 83 provided at the tip of the wiper 82. At the same time, the moisturizer near the discharge surface 22 b is wiped by the wiper 82. That is, according to the modification, the moisturizing step and the wiping step can be performed simultaneously.

  The present invention described above has the following effects.

  Please refer to FIG. When cleaning is performed only by suction by the suction pump 41 without pressurization, there is a possibility that the ink attached to the discharge port 22 a may remain. In particular, when an ink having excellent quick-drying properties, such as an aqueous resin ink, is employed, this tendency may be intensified. In order to reliably remove the ink attached to the discharge port 22a, it is necessary to employ a suction pump 41 having a larger output. As the performance of the suction pump increases, the price of the suction pump also increases.

  It is also conceivable to send the ink from the liquid feed pump 24 until the ink adhering to the discharge port 22a is removed. In this case, the consumption amount of the ink increases, and the running cost of the ink jet printer 10 increases.

  Please refer to FIG. In the present invention, in a state where the inside of the ink head 22 is pressurized, the ink remaining in the ink head 22 is sucked from the discharge port 22 a. The hydraulic pressure of the ink In passing through the discharge port 22a is higher than that in the case where no pressure is applied. By increasing the force applied to each discharge port 22a, it is possible to more reliably remove the ink (adhesion) attached to the peripheral edge of the discharge port 22a. A large output suction pump and a large amount of ink are not required to remove the ink.

  Please refer to FIG. The pressurization process is performed by sending the ink to the ink head 22. The inside of the ink head 22 can be pressurized without adding new parts.

  The amount of ink sent to the ink head 22 is an amount that can stay in the ink head 22 so that the ink does not drip from the discharge port 22 a by the ink suction process. The consumption of ink can be reduced, and the running cost of the ink jet printer 10 can be reduced.

  The internal pressure of the ink head 22 after the suction process is higher than the internal pressure of the ink head before the pressure process. The internal pressure of the ink head before the pressing step can be referred to as the internal pressure of the ink head 22 at the normal time. When the internal pressure of the ink head 22 during the suction process is excessively low, the moistening liquid Mo is excessively filled in the ink head 22. For this reason, the excessive filling of the moisturizing liquid is suppressed by adjusting the suction amount of the ink in the suction step. When using the ink jet printer 10 after humidification, the ink is sent to discharge the moisturizing liquid Mo remaining in the ink head 22. By using an appropriate amount of moisturizer Mo, the amount of ink to be sent can be maintained at an appropriate amount. The running cost of the inkjet printer 10 can be reduced.

  When the ink jet printer 10 is used again after humidification, the cap 42 is removed from the ink head 22. By making the internal pressure of the ink head 22 after the suction process higher than the internal pressure of the ink head before the pressure process, excessive suction of air into the ink head 22 can be suppressed when the cap 42 is removed. it can.

  The internal pressure of the ink head 22 after the suction process is lower than the atmospheric pressure. As a result, it is possible to suppress the dropping of the ink from the ink head 22 after the suction process. It is possible to suppress the adhesion of the ink to other parts and the like.

  Please refer to FIG. After the ink is sucked, the discharge port 22a is dipped in the moisturizing liquid Mo. By sucking the ink from the discharge port 22a, the moisturizing liquid Mo can be easily included from the discharge port 22a to the ink head 22. In addition, by sucking the ink in advance, it is difficult for the moisturizing liquid Mo to be dropped from the vicinity of the discharge port 22a. The moisturizer Mo can be more reliably left on the periphery of the discharge port 22a, and can effectively moisturize.

  Refer to FIG. 9 (b). It has the wiping process which wipes off the moisturizer adhering to the periphery of discharge mouth 22a. It is possible to prevent the moisturizing liquid from dripping from the discharge port.

  In the wiping step, the force for wiping the peripheral edge of the ejection opening 22a is set to be weaker than the force at which the ink attached to the peripheral edge of the ejection opening 22a is wiped. It is possible to suppress excessive wiping of the moisturizing solution and to leave an appropriate amount of moisturizing solution in the wiping step. It is possible to moisturize the discharge port properly.

  Please refer to FIG. There is an internal pressure adjustment step of delivering less ink to the ink head 22 from which the ink has been sucked. When the liquid pressure in the ink head 22 is low, there is a possibility that the ink head 22 may be filled with an excessive amount of moisturizing liquid. When the moisturizing liquid flows in excess, it is necessary to discharge and discard the ink mixed with the moisturizing liquid from the discharge port 22a before using the printer next time. By sending a smaller amount of ink than was sucked, the fluid pressure of the ink in the ink head 22 can be adjusted and filled with an appropriate amount of moisturizer. This can reduce the amount of ink discarded.

  Furthermore, it has an internal pressure adjustment step after the suction step. Thereby, more ink can be sucked in the suction step. While being able to remove the ink adhering to discharge mouth 22a more certainly, a suitable quantity of moisturizer Mo can be filled in a moisturizing process.

  Please refer to FIG. The moisturizing process and the wiping process are performed simultaneously. This makes it possible to reduce the time required for moisturizing.

  Although the ink jet printer according to the present invention has been described based on the example in which the aqueous resin ink is adopted, the ink jet printer according to the present invention can be applied even when other inks are adopted.

  The timing for cleaning and moisturizing is not limited to when the power is turned off. When used continuously, cleaning may be performed after a predetermined time has elapsed.

  A plurality of cleaning modes may exist. Specifically, it is possible to provide a cleaning mode when the amount of ink attached to the ink head is small and a cleaning mode when the amount of ink attached to the ink head is large. When the amount of ink adhering to the ink head is small, the inside of the ink head is pressurized to 3 kPa, and when the amount of ink adhering to the ink head is large, the pressure is pressurized to, for example, 5 kPa in the pressurizing step. Also good. That is, when the amount of ink attached to the ink head is large, the inside of the ink head can be more pressurized in the pressurization step, as compared to the case where the amount of ink attached to the ink head is small.

  Furthermore, when the amount of ink adhering to the ink head is small, 0.5 ml of ink is sent per nozzle row of the ink head, and when the amount of ink adhering to the ink head is large, the nozzle 1 of the ink head It is also possible to send 1.0 ml of ink per row. When the amount of ink attached to the ink head is large, the stop time may be set to 60 seconds, and the stop time may be longer than when the amount of ink attached to the ink head is small.

  The selection of these modes can be made by arranging a sensor and automatically selecting according to the detected value, or can be made by an operator.

  The present invention is not limited to the examples as long as the functions and effects of the present invention can be achieved.

  The cleaning method of the ink head of the present invention is suitable for an ink jet printer using an aqueous resin ink.

DESCRIPTION OF SYMBOLS 10 ... Ink-jet type printer 22 ... Ink head 22a ... Discharge port 24 ... Liquid feeding pump 41 ... Suction pump 42 ... Cap 50 ... Moisturizing part 60 ... Wiping part In ... Ink

Claims (4)

In a method of moisturizing an ink head, which moisturizes the discharge port of an ink head used for an ink jet printer,
An ink suction step of suctioning at least a portion of the ink remaining in the ink head from the discharge port;
A moisturizing step of immersing the discharge port in a moisturizing liquid after the ink is sucked.   2. A method according to claim 1, further comprising the step of wiping the moisturizing liquid adhering to the periphery of the discharge port.   3. The ink head according to claim 2, wherein in the wiping step, a force for wiping the peripheral edge of the discharge port is set to be weaker than a force at which the ink attached to the peripheral edge of the discharge port is wiped. How to moisturize. Between the suction process and the moisturizing process,
The ink head according to any one of claims 1 to 3, further comprising an internal pressure adjusting step of sending the ink which is less sucked to the ink head from which the ink is sucked. How to moisturize.

Images