Ink jet recording device

Abstract

To provide an ink jet recording device in which plastic deformation of a water-absorbing roller is suppressed, consequently the water absorbency of the water-absorbing roller can be ensured.SOLUTION: An ink jet recording device comprises: a belt (endless belt 11) which conveys a recording medium; an image forming portion (head 2) which forms an image on the recording medium conveyed by the belt; a cleaning portion (cleaning device 12) which supplies cleaning liquid to the belt and cleans it; a water-absorbing roller 21 which is installed on the downstream side in the conveyance direction of the belt relative to the cleaning portion and is pressurized against the belt to absorb the cleaning liquid on the belt; and a pressurization releasing portion (control portion 100) which releases the pressurization of the water-absorbing roller 21 to the belt.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an inkjet recording apparatus.

Background Art

[0002] Conventionally, an inkjet recording apparatus that ejects ink from an inkjet head to form an image on a recording surface of a fabric (recording medium) is known. In the above inkjet recording apparatus, the fabric is conveyed to a predetermined position and positioned while being adhesively fixed to an endless belt. Thereafter, ink is applied from the inkjet head to the positioned fabric. When applying ink to the end of the fabric, the ink also adheres to the exposed surface of the endless belt adjacent to the end. Further, if dust or the like adhering to the fabric adheres to the endless belt, the adhesive fixability of the fabric to the endless belt deteriorates.

[0003] Therefore, a configuration is known in which water is sprayed onto the conveying surface of the endless belt outside the conveyance section of the fabric for cleaning, and then wiped off by a water absorption roller to remove moisture (see, for example, Patent Documents 1 and 2). According to the configurations described in Patent Documents 1 and 2, the outer surface (conveying surface) of the endless belt can be cleaned. Further, the adhesive fixability of the endless belt can be restored. Further, Patent Documents 1 and 2 disclose a configuration in which a squeezing roller for squeezing moisture from the water absorption roller is provided in pressure contact with the water absorption roller. According to the configurations described in Patent Documents 1 and 2, the water absorption roller can absorb moisture from the endless belt again.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the configuration described in Patent Document 1, since the squeezing roller remains in pressure contact with the water-absorbing roller, the water-absorbing roller undergoes plastic deformation due to drying or the like. When the water-absorbing roller undergoes plastic deformation, there is a problem that the water absorption property deteriorates and water absorption becomes impossible. Further, in the configuration described in Patent Document 2, since the water-absorbing roller remains in pressure contact with the endless belt, the water-absorbing roller undergoes plastic deformation due to drying or the like. When the water-absorbing roller undergoes plastic deformation, there is a problem that the water absorption property deteriorates and water absorption becomes impossible.

[0006] An object of the present invention is to provide an inkjet recording apparatus capable of suppressing plastic deformation of a water-absorbing roller and ensuring the water absorption property of the water-absorbing roller.

Means for Solving the Problems

[0007] The invention according to claim 1 is made to achieve the above object, in an inkjet recording apparatus, a belt for conveying a recording medium, an image forming unit that forms an image on the recording medium conveyed by the belt, a cleaning unit that supplies a cleaning liquid to the belt for cleaning, a water-absorbing roller that is installed downstream of the cleaning unit in the conveying direction of the belt and is pressed against the belt to absorb the cleaning liquid on the belt, a pressing release unit that releases the pressing of the water-absorbing roller against the belt, and is characterized by comprising the above.

[0008] The invention according to claim 2 is the inkjet recording apparatus according to claim 1, comprising a squeezing roller that is pressed against the surface of the water-absorbing roller to remove moisture from the water-absorbing roller, wherein the pressing release unit releases the pressing of the water-absorbing roller against the belt and also releases the pressing of the squeezing roller against the water-absorbing roller.

[0009] The invention according to claim 3 is an inkjet recording apparatus according to claim 1, wherein the water absorption roller is installed below the belt.

[0010] The invention according to claim 4 is an inkjet recording apparatus according to claim 3, wherein the pressing release unit lowers the water absorption roller to release the pressing of the water absorption roller against the belt.

[0011] The invention according to claim 5 is an inkjet recording apparatus according to claim 2, wherein the water absorption roller is installed below the belt, <{ the squeezing roller is installed below the water absorption roller.

[0012] The invention according to claim 6 is an inkjet recording apparatus according to claim 5, wherein the pressing release unit lowers the water absorption roller and the squeezing roller to release the pressing of the water absorption roller against the belt and the pressing of the squeezing roller against the water absorption roller.

[0013] The invention according to claim 7 is an inkjet recording apparatus according to claim 4, wherein the pressing release unit controls the lifting amount of the water absorption roller to control the pressing amount.

[0014] The invention according to claim 8 is an inkjet recording apparatus according to claim 6, wherein the pressing release unit controls the lifting amounts of the water absorption roller and the squeezing roller to control the pressing amount.

[0015] The invention according to claim 9 is an inkjet recording apparatus according to claim 1, wherein The pressing release unit is characterized by releasing the pressing of the water absorption roller against the belt at a predetermined time.

[0016] The invention according to claim 10 is an inkjet recording apparatus according to claim 2, The pressing release unit is characterized by releasing the pressing of the water absorption roller against the belt and the pressing of the squeezing roller against the water absorption roller at a predetermined time.

[0017] The invention according to claim 11 is an inkjet recording apparatus according to claim 9 or 10, The predetermined time includes the time when the power is turned off.

[0018] The invention according to claim 12 is an inkjet recording apparatus according to claim 9 or 10, The predetermined time includes the time when a jam occurs.

[0019] The invention according to claim 13 is an inkjet recording apparatus according to claim 9 or 10, The predetermined time includes the time preset by the user.

Effect of the Invention

[0020] According to the present invention, plastic deformation of the water absorption roller can be suppressed, and water absorption performance of the water absorption roller can be ensured.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0023] As shown in FIGS. 1 and 2, the inkjet recording apparatus 1 according to the present embodiment includes a control unit 100, a head 2, a medium supply device 3, and a medium conveyance device 10.

[0024] As the recording medium of the present invention on which an image is formed, a fabric S is applied. As the head 2, an inkjet method for discharging ink onto the fabric S is applied. The head 2 functions as an image forming unit of the present invention that forms an image on the fabric S conveyed by the endless belt 11.

[0025] The control unit 100 includes a CPU, a RAM, a ROM, etc. First, the CPU reads out various processing programs stored in the ROM according to various signals and expands them in the RAM. Next, the CPU comprehensively controls the operation of the inkjet recording apparatus 1 in cooperation with the various programs expanded in the RAM.

[0026] The medium conveyance device 10 includes an endless belt 11, a cleaning device 12, a water absorption device 20, and a lifting device 30.

[0027] The endless belt (belt) 11 is wound and installed between a plurality of rollers 111 and 112. The endless belt 11 is driven to run by the rotational drive of a motor (not shown) provided on the roller 111 side. In this case, the roller 112 rotates passively, but the roller 112 may be driven and the roller 111 may rotate passively. Also, each roller 111 and 112 may be provided with a motor for driving them respectively, and they may rotate synchronously. P1 on the endless belt 11 is a belt water absorption position by the water absorption device 20.

[0028] The medium supply device 3 supplies the fabric S onto the surface of the endless belt 11 on the downstream side in the running direction of the endless belt 11 from the belt water absorption position P1 and on the upstream side of the head 2. The medium supply device 3 guides the fabric S unwound from an unwinding roller (not shown) to the endless belt 11. The medium supply device 3 presses it against the surface of the endless belt 11 by a pressing roller 3a. The surface of the endless belt 11 is an adhesive surface on which a layer by an adhesive is formed. For this reason, the fabric S pressed by the pressing roller 3a is attached to the surface of the endless belt 11. The fabric S attached to the surface of the endless belt 11 is conveyed toward the head 2 by the endless belt 11 running in synchronization with the medium supply device 3.

[0029] After the image formation is performed on the fabric S by the head 2, the fabric S is peeled off from the surface of the endless belt 11 by a peeling means (not shown). The fabric S peeled off from the surface of the endless belt 11 is dried by a drying device (not shown) and then recovered by being wound around a winding roller (not shown) or the like. On the other hand, the endless belt 11 after the fabric S is peeled off is cleaned by a cleaning device 12 installed on the downstream side in its running direction.

[0030] The cleaning device 12 sequentially includes an injection nozzle 121, a brush roller 122, an injection nozzle 123, and a blade 124. The cleaning device 12 supplies a cleaning liquid (water) to the endless belt 11 after the fabric S is peeled off and cleans it. That is, the cleaning device 12 functions as the cleaning unit of the present invention. The injection nozzle 121 injects and supplies the cleaning liquid to the endless belt 11. The brush roller 122 brushes the endless belt 11. The injection nozzle 123 injects and supplies the cleaning liquid to the endless belt 11 again. The blade 124 scrapes off the attached water droplets. The scraped-off water droplets are configured to accumulate on the water receiving tray 31. The cleaning device 12 is supported by the water receiving tray 31 and is configured to be able to move up and down in conjunction with the water receiving tray 31 by an air cylinder 32.

[0031] After cleaning, the endless belt 11 has the remaining moisture absorbed by the water absorption device 20 at the belt water absorption position P1 on the downstream side in its running direction. The water absorption device 20 is installed such that the water absorption roller 21 can be pressed against the surface of the endless belt 11 at the belt water absorption position P1.

[0032] As described above, by the circulating conveyance of the endless belt 11, the cycle of supplying the fabric S, forming an image, removing the fabric S, cleaning by water washing, and absorbing the remaining moisture is repeatedly executed.

[0033] The water absorption device 20 includes a water absorption roller 21 and a squeezing roller 22. The water absorption device 20 is supported by a water receiving tray 31 and is configured to be able to move up and down in conjunction with the water receiving tray 31 by an air cylinder 32.

[0034] The water absorption roller 21 is installed downstream of the cleaning device 12 in the conveyance direction of the endless belt 11. The water absorption roller 21 is provided on a support shaft 21a parallel to the axial direction of the two rollers 111, 112 and rotates following the movement of the endless belt 11. The water absorption roller 21 is installed below the endless belt 11 and is installed such that it can be pressed against the surface of the endless belt 11. The water absorption roller 21 is pressed by the endless belt 11 to absorb the moisture (cleaning liquid) on the endless belt 11. On the surface of the endless belt 11 opposite to the position (belt water absorption position P1) pressed by the water absorption roller 21, a counter roller 23 that rotates following the movement of the endless belt 11 is provided. The counter roller 23 is fixed in a state of being in contact with the endless belt 11. The water absorption roller 21 is made of sponge, rubber sponge, non-woven fabric hardened into the above shape, water absorption fiber material, etc. Note that the water absorption roller 21 can be composed of any material having water absorption and elasticity. The water absorption roller 21 is attached to the water receiving tray 31 via a spring (not shown) connected to a plate (not shown) attached to the support shaft 21a. That is, the water absorption roller 21 is attached to the water receiving tray 31 via the plate and the spring.

[0035] The squeezing roller 22 is made of a metal material and is a roller for squeezing out the moisture absorbed by the water absorption roller 21. The squeezing roller 22 is provided on a support shaft 22a parallel to the axial direction of the two rollers 111, 112 and rotates following the rotation of the water absorption roller 21. The squeezing roller 22 is installed below the water absorption roller 21 and is installed so as to be able to press against the surface of the water absorption roller 21. The squeezing roller 22 is pressed against the surface of the water absorption roller 21 to remove the moisture (cleaning liquid) on the water absorption roller 21. Although the surface of the water absorption roller 21 has absorbed moisture, by pressing the squeezing roller 22, the moisture on the surface of the water absorption roller 21 is squeezed out. As described above, by providing the squeezing roller 22, the water absorption property of the water absorption roller 21 can be ensured. The squeezing roller 22 is attached to the water receiving tray 31 via a spring 22b connected to a plate (not shown) attached to the support shaft 22a. That is, the squeezing roller 22 is attached to the water receiving tray 31 via the plate and the spring 22b.

[0036] The lifting device 30 includes a water receiving tray 31 and an air cylinder 32. The water receiving tray 31 supports the cleaning device 12 and the water absorption device 20 from below. The water receiving tray 31 is configured to receive the water droplets adhering to the brush roller 122, the water droplets scraped off by the blade 124, and the moisture squeezed out by the squeezing roller 22. The air cylinder 32 supports the water receiving tray 31 from below. The air cylinder 32 raises and lowers the cleaning device 12 and the water absorption device 20 via the water receiving tray 31.

[0037] The control unit 100 controls the air cylinder 32 to release the pressing of the water absorption roller 21 against the endless belt 11. That is, the control unit 100 functions as a pressing release unit of the present invention. Specifically, the control unit 100 lowers the water absorption roller 21 via the water receiving tray 31 to separate the water absorption roller 21 from the endless belt 11. Thereby, the pressing of the water absorption roller 21 against the endless belt 11 is released.

[0038] Further, the control unit 100 releases the pressure on the endless belt 11 of the water absorption roller 21 and releases the pressure on the water absorption roller 21 of the throttle roller 22. Specifically, the control unit 100 lowers the throttle roller 22 via the water receiving tray 31, thereby separating the throttle roller 22 from the water absorption roller 21. As a result, the pressure of the throttle roller 22 on the water absorption roller 21 is released. Note that the lowering of the water absorption roller 21 and the lowering of the throttle roller 22 are performed by a single lowering operation of the water receiving tray 31 by the air cylinder 32. That is, the release of the pressure on the endless belt 11 of the water absorption roller 21 and the release of the pressure on the water absorption roller 21 of the throttle roller 22 are performed in conjunction. Also, the raising of the water absorption roller 21 and the raising of the throttle roller 22 are performed by a single raising operation of the water receiving tray 31 by the air cylinder 32. That is, the pressure on the endless belt 11 of the water absorption roller 21 and the pressure on the water absorption roller 21 of the throttle roller 22 are performed in conjunction.

[0039] In the present embodiment, the water absorption roller 21 and the throttle roller 22 are moved up and down via the water receiving tray 31 by the air cylinder 32. FIG. 3 shows an example of the state near the water absorption device 20 in the pressure release state. In the example shown in FIG. 3, the water absorption roller 21 is separated from the endless belt 11, and the throttle roller 22 is separated from the water absorption roller 21. FIG. 4 shows an example of the state near the water absorption device 20 in the pressed state. In the example shown in FIG. 4, the endless belt 11 is pressed against the water absorption roller 21, and the water absorption roller 21 is pressed against the throttle roller 22.

[0040] The control unit 100 controls the air cylinder 32 to switch between the pressure release state and the pressed state. Specifically, when switching from the pressure-release state to the pressed state, the water receiving tray 31 is used to raise the water absorption roller 21 and the throttle roller 22. When the water absorption roller 21 abuts against the endless belt 11, since the opposing roller 23 is fixedly arranged on the opposite surface of the endless belt 11, the upward movement of the water absorption roller 21 is restricted and it is fixed at the abutting position. As a result, the endless belt 11 is pressed against the water absorption roller 21. The water absorption roller 21 is attached to the water receiving tray 31 via a spring. When the water receiving tray 31 rises after the upward movement of the water absorption roller 21 is restricted, the water receiving tray 31 rises as the spring contracts. That is, the throttle roller 22 continues to rise even after the upward movement of the water absorption roller 21 is restricted and eventually abuts against the water absorption roller 21. The throttle roller 22 is attached to the water receiving tray 31 via a spring. When the water receiving tray 31 rises even after the throttle roller 22 abuts against the water absorption roller 21, the upward movement amount of the throttle roller 22 decreases due to the reaction force from the water absorption roller 21, but the water receiving tray 31 rises as the spring contracts by that amount. As a result, the water absorption roller 21 is pressed against the throttle roller 22. Thus, it is possible to switch from the pressure-release state to the pressed state.

[0041] On the one hand, when switching from the pressed state to the pressure - released state, the water - receiving tray 31 is used to lower the water - absorbing roller 21 and the squeezing roller 22. As the water - receiving tray 31 descends, first, each spring that was compressed returns to its original state due to its elasticity. When each spring returns to its original state, each roller that was biased by each spring starts to descend. Since there is a difference in the ascending amount of the water - absorbing roller 21 and the squeezing roller 22 when switching from the pressure - released state to the pressed state, there is also a difference in the amount of compression of each spring that biases each roller. Specifically, since the ascending amount of the water - absorbing roller 21 is smaller than that of the squeezing roller 22, the amount of compression of the spring that biases the water - absorbing roller 21 is larger accordingly. That is, the time until each spring returns to its original state is longer for the spring that biases the water - absorbing roller 21 than for the spring that biases the squeezing roller 22. Therefore, the squeezing roller 22 starts to descend earlier than the water - absorbing roller 21. As a result, the squeezing roller 22 moves away from the water - absorbing roller 21. After the squeezing roller 22 starts to descend and the spring that biases the water - absorbing roller 21 returns to its original state, the water - absorbing roller 21 also starts to descend. As a result, the water - absorbing roller 21 moves away from the endless belt 11. Thus, it is possible to switch from the pressed state to the pressure - released state.

[0042] Also, the control unit 100 releases the pressure on the endless belt 11 by the water - absorbing roller 21 at a predetermined time. Further, the control unit 100 releases the pressure on the water - absorbing roller 21 by the squeezing roller 22 at a predetermined time. In this embodiment, the descent of the water - absorbing roller 21 and the descent of the squeezing roller 22 are performed by a single descent operation of the water - receiving tray 31 by the air cylinder 32. Therefore, the control to release the pressure on the endless belt 11 by the water - absorbing roller 21 and the control to release the pressure on the water - absorbing roller 21 by the squeezing roller 22 are the same control. [[ID=?]] [[ID=?]]

[0043] [[ID=?]] Here, the predetermined time is when the image formation by the head 2 is not being performed. When the image formation by the head 2 is being performed, it is necessary to constantly clean the endless belt 11 by the cleaning device 12, so the pressure on the endless belt 11 by the water - absorbing roller 21 cannot be released. Specific examples of the specified time include when the power is turned off, when jamming occurs, and a time preset by the user, etc.

[0044] In the inkjet recording apparatus 1, after an image is formed on the fabric S and removed from the endless belt 11, the endless belt 11 is cleaned by the cleaning device 12. When the cleaned endless belt 11 reaches the belt water absorption position P1, the residual water after cleaning is absorbed by the water absorption roller 21 that rolls while being in pressure contact with the endless belt 11. When the image formation by the head 2 is completed and the cleaning of the endless belt 11 and the absorption of the residual water are completed, it is switched from the pressed state to the pressure released state. That is, the control unit 100 controls the air cylinder 32 to lower the water absorption device 20 (the water absorption roller 21 and the squeezing roller 22). Thereby, the pressure of the water absorption roller 21 against the endless belt 11 and the pressure of the squeezing roller 22 against the water absorption roller 21 are released. Therefore, plastic deformation of the water absorption roller 21 can be suppressed. When restarting the image formation by the head 2, it is switched from the pressure released state to the pressed state. That is, the control unit 100 controls the air cylinder 32 to raise the water absorption device 20 (the water absorption roller 21 and the squeezing roller 22). Thereby, the endless belt 11 is pressed against the water absorption roller 21, and the water absorption roller 21 is pressed against the squeezing roller 22. Therefore, since the residual water of the endless belt 11 can be absorbed, the image formation by the head 2 can be restarted.

[0045] As described above, the inkjet recording apparatus 1 according to the present embodiment includes a belt (endless belt 11), an image forming unit (head 2), a cleaning unit (cleaning device 12), a water absorption roller 21, and a pressure release unit (control unit 100). The belt conveys the recording medium (fabric S). The image forming unit forms an image on the recording medium conveyed by the belt. The cleaning unit supplies a cleaning liquid to the belt for cleaning. The water absorption roller 21 is installed downstream of the belt in the conveyance direction compared to the cleaning unit, and is pressed against the belt to absorb the cleaning liquid on the belt. The pressure release unit releases the pressure of the water absorption roller 21 against the belt. Therefore, according to the inkjet recording apparatus 1 according to the present embodiment, plastic deformation of the water absorption roller 21 can be suppressed. Thus, the water absorption property of the water absorption roller 21 can be ensured.

[0046] Further, a squeezing roller 22 that is pressed against the surface of the water absorption roller 21 to remove the moisture of the water absorption roller 21 is provided. The pressing release unit releases the pressing of the water absorption roller 21 against the belt and also releases the pressing of the squeezing roller 22 against the water absorption roller 21. Therefore, plastic deformation of the water absorption roller 21 can be suppressed. Thus, the water absorption property of the water absorption roller 21 can be ensured.

[0047] Further, the water absorption roller 21 is installed below the belt, and the squeezing roller 22 is installed below the water absorption roller 21. The pressing release unit lowers the water absorption roller 21 and the squeezing roller 22 to release the pressing of the water absorption roller 21 against the belt and the pressing of the squeezing roller 22 against the water absorption roller 21. Therefore, plastic deformation of the water absorption roller 21 can be suppressed with a simple configuration and control. Thus, the water absorption property of the water absorption roller 21 can be easily ensured.

[0048] Further, the pressing release unit releases the pressing of the water absorption roller 21 against the belt and the pressing of the squeezing roller 22 against the water absorption roller 21 at a predetermined time. The predetermined time includes when the power is turned off, when a jam occurs, and a time preset by the user. Therefore, each pressing can be released at a timing when an image is not being formed by the image forming unit. Thus, plastic deformation of the water absorption roller 21 can be suppressed without interfering with image formation by the image forming unit.

[0049] As described above, the embodiments according to the present invention have been specifically described, but the present invention is not limited to the above embodiments and can be modified without departing from the gist thereof.

[0050] For example, the control unit 100 may control the lifting amount of the water absorption roller 21 to control the pressing amount against the endless belt 11. Further, the control unit 100 may control the lifting amount of the throttle roller 22 to control the pressing amount against the water absorption roller 21. In the present invention, the lifting of the water absorption roller 21 and the lifting of the throttle roller 22 are performed by one lifting operation of the water receiving tray 31 by the air cylinder 32. Therefore, the control of the lifting amount of the water absorption roller 21 and the control of the lifting amount of the throttle roller 22 are the same control. As described above, the pressing release unit controls the lifting amounts of the water absorption roller 21 and the throttle roller 22 to control the pressing amount. Thereby, the pressing amount against each roller can be controlled. Therefore, the amount of water absorbed by the water absorption roller 21 and the amount of water squeezed out by the throttle roller 22 can be adjusted.

[0051] Further, in the above embodiment, the fabric S is exemplified as the recording medium of the present invention, but the present invention is not limited thereto. That is, any sheet-like medium can be an object of image formation.

[0052] In addition, regarding the detailed configuration of each device constituting the inkjet recording apparatus and the detailed operation of each device, it can be appropriately changed without departing from the spirit of the present invention.

Explanation of reference numerals

[0053] 1 Inkjet recording apparatus 100 Control unit (pressing release unit) 2 Head (image forming unit) 3 Medium supply device 3a Pressing roller 10 Medium conveyance device 11 Endless belt (belt) 111, 112 Roller 12 Cleaning device (cleaning unit) 121, 123 Injection nozzle 122 Brush roller 124 Blade 20 Water absorption device 21 Suction roller 22 Squeezing roller 23 Opposing roller 30 Lifting device 31 Water tray 32 Air cylinder S Fabric (recording medium) P1 Belt suction position

Claims

1. A belt for transporting a recording medium, An image forming unit that forms an image on the recording medium transported by the belt, A cleaning unit that supplies a cleaning liquid to the belt for cleaning, A water absorption roller installed downstream of the cleaning unit in the transport direction of the belt, pressed against the belt to absorb the cleaning liquid on the belt, A pressing release unit that releases the pressing of the water absorption roller against the belt, An inkjet recording apparatus characterized by comprising the above.

2. Comprising a squeezing roller that is pressed against the surface of the water absorption roller to remove the moisture of the water absorption roller, The pressing release unit according to claim 1, wherein the pressing release unit releases the pressing of the water absorption roller against the belt and also releases the pressing of the squeezing roller against the water absorption roller.

3. The inkjet recording apparatus according to claim 1, wherein the water absorption roller is installed below the belt.

4. The inkjet recording apparatus according to claim 3, wherein the pressing release unit releases the pressing of the water absorption roller against the belt by lowering the water absorption roller.

5. The water absorption roller is installed below the belt, The inkjet recording apparatus according to claim 2, wherein the squeezing roller is installed below the water absorption roller.

6. The inkjet recording apparatus according to claim 5, wherein the pressing release unit lowers the water absorption roller and the squeezing roller to release the pressing of the water absorption roller against the belt and the pressing of the squeezing roller against the water absorption roller.

7. The inkjet recording apparatus according to claim 4, wherein the pressing release unit controls the pressing amount by controlling the lifting amount of the water absorption roller.

8. The inkjet recording apparatus according to claim 6, wherein the pressing release unit controls the pressing amount by controlling the lifting amounts of the water absorption roller and the squeezing roller.

9. The inkjet recording apparatus according to claim 1, wherein the pressing release unit releases the pressing of the water absorption roller against the belt at a predetermined time.

10. The inkjet recording apparatus according to claim 2, wherein the pressing release unit releases the pressing of the water absorption roller against the belt and the pressing of the squeezing roller against the water absorption roller at a predetermined time.

11. The inkjet recording apparatus according to claim 9 or 10, wherein the predetermined time includes the time when the power is turned off.

12. The inkjet recording apparatus according to claim 9 or 10, wherein the predetermined time includes the time when a jam occurs.

13. The inkjet recording apparatus according to claim 9 or 10, wherein the predetermined time includes a time preset by a user.

Images