JP6245099B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an ink jet recording apparatus.

  A general ink jet recording apparatus includes a recording head and a wiper. The recording head has an ink ejection surface. The ink ejection surface includes a first area where a nozzle for ejecting ink to the recording medium opens, a second area adjacent to one end of the first area, and a third area adjacent to the other end of the first area. . The wiper wipes ink adhering to the ink ejection surface by moving from the third region to the second region via the first region (wiping). The third area is a wiping start position.

  If the ink discharge surface is wiped with the wiper or the ink discharge surface being dry (dry wiping), the nozzle may be damaged. In addition, dry wiping may not be able to remove the fixed matter adhering to the ink ejection surface. Therefore, the ink is discharged from the nozzle, and the wiper or the ink discharge surface is moistened, and the wiper wipes the ink discharge surface (wet wiping).

  However, in the case of wet wiping, the ink remaining in the third region may be stretched. Ink stretching means that the ink is stretched in the direction opposite to the moving direction from the tip of the moving wiper while contacting the ink ejection surface. For example, if the viscosity of the ink remaining in the third region, which is the start position of wiping, is high, the viscosity of the ink that moves by adhering to the tip of the wiper on the downstream side in the movement direction of the wiper increases. Ink stretching is likely to occur.

  When the ink is dried and thickened, it becomes difficult to remove the ink, and thus the stretched ink may accumulate on the ink ejection surface. Then, there is a possibility that the recording medium is contaminated by the accumulated ink. Therefore, it is required to suppress ink stretching.

  Therefore, the recording head described in Patent Document 1 is provided with a wiping dummy nozzle for forcibly discharging ink upstream of the nozzle in the movement direction of the wiper. By discharging low viscosity ink from the dummy nozzle and wetting the tip of the wiper with the ink, stretching of the ink is suppressed.

JP 2006-218748 A

  However, since the recording head described in Patent Document 1 is provided with dummy nozzles, the flow path in the recording head becomes complicated and the cost increases. Moreover, since ink is discharged not only by the nozzle but also by the dummy nozzle, the amount of waste ink increases.

  SUMMARY An advantage of some aspects of the invention is that it provides an ink jet recording apparatus capable of wiping off ink adhering to a recording head while suppressing ink stretching with a simple configuration.

  According to the present invention, the ink jet recording apparatus includes a recording head, a wiper, a moving mechanism, a control unit, and a hydrophilic unit. The recording head has an ink ejection surface. The ink ejection surface includes a first region and a second region. In the first region, a nozzle for ejecting ink is opened. The second region is adjacent to one end of the first region. The moving mechanism moves the wiper along the ink discharge surface in a state where the wiper is in contact with the ink discharge surface. The control unit causes the moving mechanism to move the wiper. The hydrophilic portion is formed in the second region and has higher hydrophilicity than the second region.

  According to the present invention, it is possible to wipe off ink adhering to the recording head while suppressing ink stretching with a simple configuration.

1 is a diagram illustrating a configuration of an ink jet recording apparatus according to an embodiment of the present invention. It is a figure which shows the head part of the inkjet recording device which concerns on embodiment of this invention. FIG. 2 is a diagram illustrating a recording head and a wiper unit of the ink jet recording apparatus according to the embodiment of the invention. (A)-(e) It is a figure which shows the operation | movement (outward path | route) of the wiper of the inkjet recording device which concerns on embodiment of this invention. (A)-(e) It is a figure which shows the operation | movement (return path) of the wiper of the inkjet recording device which concerns on embodiment of this invention. 1 is a front view showing a recording head of an ink jet recording apparatus according to an embodiment of the present invention. 1 is a side view showing a recording head of an ink jet recording apparatus according to an embodiment of the present invention. It is a figure which shows the state which lowered | hung the wiper part of the inkjet recording device which concerns on embodiment of this invention. It is a figure which shows the state which raised the wiper part of the inkjet recording device which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof is not repeated. In the present embodiment, the X axis and the Y axis are parallel to the horizontal plane, and the Z axis is parallel to the vertical line.

  With reference to FIGS. 1 and 2, an ink jet recording apparatus 1 according to the present embodiment will be described. FIG. 1 shows the configuration of the inkjet recording apparatus 1. The ink jet recording apparatus 1 includes a head unit 3, a control unit 50, a wiper unit 60, a tray 200, a feed roller 201, a first transport unit 205, a second transport unit 212, and a cap unit 290.

  The tray 200 is provided upstream of the first transport unit 205 in the transport direction P of the recording medium T and accommodates the recording medium T. A feeding roller 201 is provided at the downstream end of the tray 200 in the transport direction P. The feeding roller 201 conveys the recording medium T accommodated in the tray 200 to the first conveyance unit 205 one by one. The recording medium T is, for example, paper such as plain paper, copy paper, recycled paper, thin paper, thick paper, or glossy paper, or a sheet made of a synthetic resin such as an OHP (Overhead Projector) sheet.

  The first transport unit 205 includes a first drive roller 206, a first driven roller 207, and a first transport belt 208 that is stretched over the first drive roller 206 and the first driven roller 207. As the first drive roller 206 rotates counterclockwise, the first transport belt 208 rotates, and the recording medium T held on the first transport belt 208 is transported in the transport direction P.

  The head unit 3 is disposed to face the first transport unit 205. The head unit 3 includes a head housing 18 and line heads 10K, 10C, 10M, and 10Y held by the head housing 18. FIG. 2 shows the head unit 3. The line heads 10K, 10C, 10M, and 10Y respectively discharge or discharge black ink, cyan ink, magenta ink, and yellow ink. The line heads 10K to 10Y are arranged along the conveyance direction P of the recording medium T. Each of the line heads 10 </ b> K to 10 </ b> Y includes three recording heads 10 arranged in a staggered manner along a direction orthogonal to the transport direction P.

  As shown in FIG. 1, the second transport unit 212 is disposed downstream of the first transport unit 205 in the transport direction P. The second transport unit 212 includes a second drive roller 213, a second driven roller 214, and a second transport belt 215 stretched over the second drive roller 213 and the second driven roller 214. By rotating the second drive roller 213 counterclockwise, the second transport belt 215 rotates, and the recording medium T held by the second transport belt 215 is transported in the transport direction P.

  The recording medium T on which an image is recorded by the head unit 3 is sent to the second transport unit 212, and the ink ejected on the surface of the recording medium T while passing through the second transport unit 212 is dried. A wiper unit 60 and a cap unit 290 are disposed below the second transport unit 212.

  The control unit 50 lowers the first transport unit 205 when the wiper unit 60 wipes ink adhering to the ink ejection surfaces of the line heads 10K to 10Y, that is, when wiping is performed. Then, the control unit 50 horizontally moves the wiper unit 60 disposed below the second transport unit 212 and arranges it at the standby position, that is, below the head unit 3. As a result, the wiper unit 60 is disposed between the head unit 3 and the first transport unit 205. The wiper unit 60 wipes off ink adhering to the line heads 10K to 10Y and collects the wiped ink.

  When capping the ink ejection surfaces of the line heads 10 </ b> K to 10 </ b> Y, the control unit 50 moves the cap unit 290 horizontally and arranges it below the head unit 3. Further, the control unit 50 moves the cap unit 290 upward. As a result, the cap unit 290 is attached to the ink ejection surfaces of the line heads 10K to 10Y.

  The discharge roller 216 is disposed downstream of the second transport unit 212 in the transport direction P, and discharges the recording medium T on which an image is recorded to the outside of the inkjet recording apparatus 1.

  The recording head 10 and the wiper unit 60 will be described with reference to FIG. FIG. 3 shows the recording head 10 and the wiper unit 60. The wiper unit 60 includes the wiper 20 and the moving mechanism 30.

  The recording head 10 has an ink ejection surface 17. The ink ejection surface 17 includes a first area A1, a second area A2, and a third area A3. The second area A2 is adjacent to one end of the first area A1. The third area A3 is adjacent to the other end of the first area A1. A number of nozzles 11 are open in the first region A1. The nozzle 11 ejects ink for forming an image on a recording medium. The nozzle 11 discharges the ink Nf together with the unnecessary matter in the recording head 10 in the purge process. The ink Nf is stored in a sealed space. Therefore, evaporation of the volatile component contained in the ink Nf is suppressed. Volatile components evaporate when exposed to outside air. As a result, the ink Nf discharged from the nozzle 11 has a lower viscosity than the residual ink that has been in contact with the air.

  The control unit 50 causes the moving mechanism 30 to move the wiper 20. The moving mechanism 30 is controlled by the control unit 50 to move the wiper 20. Specifically, the moving mechanism 30 can raise the wiper 20 in the ascending direction D1, can move the wiper 20 in the wiping direction D3 or the wiping direction D4, and lowers the wiper 20 in the descending direction D2. Can do. In the present embodiment, the ascending direction D1 and the descending direction D2 are along the Z-axis and are orthogonal to the ink ejection surface 17, and the wiping direction D3 and the wiping direction D4 are along the X-axis. Along. The ascending direction D1 and the descending direction D2 may be collectively referred to as the vertical direction.

  The moving mechanism 30 moves the wiper 20 along the ink discharge surface 17 in a state where the wiper 20 is in contact with the ink discharge surface 17. Therefore, the wiper 20 can wipe the ink discharged from the nozzle 11 or the ink Nf discharged from the nozzle 11 and attached to the ink discharge surface 17. In addition, the wiper 20 wipes off unnecessary materials attached to the ink ejection surface 17. The wiper 20 has elasticity and has a flat plate shape. The wiper 20 is made of, for example, synthetic rubber (for example, EPDM (ethylene-propylene-diene terpolymer)) or synthetic resin.

  The ink jet recording apparatus 1 further includes a hydrophilic portion W1 and a water repellent portion W2. The hydrophilic part W1 has hydrophilicity. The hydrophilic portion W1 has higher hydrophilicity than the second region A2. The hydrophilic portion W1 is formed of, for example, a highly hydrophilic metal such as stainless steel or a highly hydrophilic synthetic resin. The hydrophilic portion W <b> 1 is formed in the second area A <b> 2 of the recording head 10 and has a hydrophilic surface 41 parallel to the ink ejection surface 17. The surface roughness of the hydrophilic surface 41 is made larger than the surface roughness of the second region A2.

  Here, the hydrophilic part W1 should just have hydrophilicity higher than 2nd area | region A2. Therefore, for example, the hydrophilic portion W1 is formed of a metal or a synthetic resin, and the hydrophilic portion W1 has a higher surface roughness than the second region A2, thereby making the hydrophilic portion W1 hydrophilic in the second region A2. Higher than hydrophilicity.

  The water repellent part W2 has higher water repellency than the second region A2. The water repellent part W2 is formed of, for example, a fluororesin. The water repellent part W2 is disposed outside the hydrophilic part W1 with respect to the first region A1. The hydrophilic part W1 and the water repellent part W2 are adjacent to each other. The water repellent part W <b> 2 has a water repellent surface 42. The water repellent surface 42 is inclined obliquely upward with respect to the ink ejection surface 17.

  As described above, according to the present embodiment, the wiper 20 moves in the wiping direction D3 in the outward wiping path, and moves the ink Nf discharged in the first region A1 to the hydrophilic portion W1. The wiper 20 moves in the wiping direction D4 in the wiping return path along with the low-viscosity ink Nf adhering to the hydrophilic portion W1. In the wiping return path, since the low-viscosity ink Nf adheres to the hydrophilic portion W1, the expansion of the ink from the second region A2 can be suppressed. In addition, in the wiping return path, the ink stretched in the wiping forward path can be effectively wiped off by the low viscosity ink Nf adhering to the hydrophilic portion W1.

  Furthermore, according to the present embodiment, in the wiping return path, the ink Nf moved in the wiping forward path is used. Therefore, no new ink is consumed in the wiping return path. As a result, the cost of purchasing ink can be reduced for the user.

  Next, the operation of the wiper 20 will be described with reference to FIGS. 4 and 5. 4A to 4E show the operation of the wiper 20 in the wiping forward path. The wiper 20 operates as follows by the moving mechanism 30 that is controlled and driven by the control unit 50.

  That is, as shown in FIG. 4A, the ink Nv is attached to the tip of the wiper 20 before wiping is started. The ink Nv is ink remaining at the tip of the wiper 20 by the previous wiping, and has increased viscosity due to contact with air. The wiper 20 ascends in the ascending direction D1 from the standby position toward the third region A3. Then, the tip of the wiper 20 is pressed against the third region A3, and the wiper 20 stops rising. As a result, the ink Nv adheres to the third area A3.

  As shown in FIG. 4B, since the nozzle 11 discharges the ink Nf, the ink Nf remains in the first area A1. The viscosity of the ink Nf is lower than the viscosity of the ink Nv attached to the tip of the wiper 20. The wiper 20 moves in the wiping direction D3 from the third region A3 toward the hydrophilic portion W1 while keeping the position in the vertical direction constant. As a result, the ink Nf remaining in the first area A1 is wiped off by the wiper 20.

  As shown in FIG. 4C, the wiper 20 moves to the hydrophilic portion W1 and stops. As a result, the ink Nf is moved from the first area A1 to the hydrophilic surface 41. Since the hydrophilic surface 41 has hydrophilicity, the ink Nf tends to adhere to the hydrophilic surface 41 as compared with the case where the hydrophilicity is low. The ink Nf is fresh and has a low viscosity. The wiper 20 is stationary for a certain period of time at the hydrophilic portion W1. As shown in FIG. 4D, the wiper 20 descends in the descending direction D2 after stopping, and stops at a position directly below the hydrophilic portion W1. As shown in FIG. 4E, the wiper 20 moves in the wiping direction D3 from a position directly below the hydrophilic portion W1, and moves to a position immediately below the water repellent portion W2.

  Fig.5 (a)-FIG.5 (e) show the operation | movement of the wiper 20 in the return path | route of wiping. As shown in FIG. 5A, the ink Nf is attached to the tip of the wiper 20. The wiper 20 rises in the rising direction D1 from the position directly below the water repellent part W2 toward the water repellent part W2, contacts the water repellent surface 42, and stops rising. Since the water repellent surface 42 has water repellency, the ink Nf attached to the tip of the wiper 20 is less likely to adhere to the water repellent surface 42 as compared to the case where the water repellent surface 42 does not have water repellency.

  As shown in FIG. 5B, the wiper 20 moves in the wiping direction D4 from the water repellent part W2 toward the hydrophilic part W1 while keeping the position in the vertical direction constant, and adheres to the hydrophilic surface 41. Wipe off Nf. Therefore, it is possible to suppress the ink Nf adhering to the hydrophilic surface 41 from being dried and thickened and depositing the ink Nf on the hydrophilic surface 41. As a result, contamination of the recording medium T with the accumulated ink can be suppressed.

  As shown in FIG. 5C, the wiper 20 continues to move in the wiping direction D4 toward the third region A3 without stopping while maintaining the position in the vertical direction constant. In this case, since the ink Nf attached to the hydrophilic surface 41 is attached to the tip of the wiper 20, the wiper 20 moves with the ink Nf and wipes the first region A1. Since the ink Nf adhering to the tip of the wiper 20 has a low viscosity, stretching of the ink Nf is suppressed.

  As shown in FIG. 5D, the wiper 20 moves to the end of the third area A3 and wipes the ink Nv remaining in the third area A3. Therefore, it is possible to suppress the dried and thickened ink Nv from being deposited in the third region A3. As a result, contamination of the recording medium T with the accumulated ink can be suppressed.

  As shown in FIG. 5E, the wiper 20 that has reached the end of the third region A3 descends in the descending direction D2. Then, the wiper 20 returns to the standby position and finishes wiping.

  As described above, according to this embodiment, as described with reference to FIGS. 4 and 5, the recording head is provided while suppressing the stretching of the ink Nf with a simple configuration by providing the hydrophilic portion W <b> 1 having high hydrophilicity. The ink adhering to the ten ink ejection surfaces 17 can be wiped off.

  In other words, the wiper 20 accompanied by the low-viscosity ink Nf moves to the hydrophilic portion W1 in the wiping path (FIGS. 4B and 4C). More ink Nf remains in the hydrophilic portion W1 than when it does not have hydrophilicity. Therefore, in the wiping return path, the wiper 20 can be moved in the wiping direction D4 with a sufficient amount of low-viscosity ink Nf at the tip of the wiper 20 (FIGS. 5B and 5C). .

  As a result, the ink discharge surface 17 can be effectively wiped while suppressing the expansion of the ink Nf from the second region A2. That is, since the viscosity of the ink Nf that moves while adhering to the tip of the wiper 20 on the downstream side in the wiping direction D4 is low, stretching of the ink Nf from the second region A2 can be suppressed. Since stretching of the ink Nf is suppressed, accumulation of the stretched ink on the ink discharge surface 17 is suppressed. Accordingly, it is possible to suppress the contamination of the recording medium due to the ink deposited on the ink discharge surface 17 dripping.

  Further, according to the present embodiment, the wiper 20 moves with a sufficient amount of low-viscosity ink Nf at the tip of the wiper 20 in the wiping return path, and thus the ink Nf stretched in the wiping path and the second The ink Nv remaining in the three areas A3 can be wiped off effectively (FIGS. 5B and 5C).

  Further, according to the present embodiment, the control unit 50 moves the wiper 20 to the moving mechanism 30 so that the wiper 20 stops at the hydrophilic portion W1 from the third region A3 via the first region A1 (FIG. 4 (b) and FIG. 4 (c)). Accordingly, the amount of ink Nf remaining in the hydrophilic portion W1 is further increased. Accordingly, in the wiping return path, the wiper 20 can be moved with a sufficient amount of ink Nf having a low viscosity at the tip of the wiper 20. As a result, the ink discharge surface 17 can be wiped more effectively while further suppressing the expansion of the ink Nf.

  Further, according to the present embodiment, the control unit 50 moves the wiper 20 so as to move to the third region A3 via the hydrophilic portion W1 and the first region A1 after contacting the water repellent portion W2. The wiper 20 is moved to 30 (FIGS. 5A to 5D). Accordingly, in the wiping return path, the wiper 20 first contacts the water repellent portion W2. As a result, it is possible to suppress the ink Nf from adhering to the wiping start position in the return path. When a large amount of ink remains at the wiping start position, and the ink is dried and thickened, and the ink is further deposited, the recording medium may be contaminated. However, in this embodiment, since the wiping start position in the return path is set to the water repellent portion W2, the remaining ink Nf is suppressed and the contamination of the recording medium can be suppressed. Further, by suppressing the ink Nf from remaining at the wiping start position, it is possible to suppress the ink Nf from extending from the wiping start position.

  Furthermore, according to the present embodiment, the hydrophilic portion W1 and the water repellent portion W2 are adjacent to each other. Accordingly, the wiper 20 can be smoothly moved from the water repellent part W2 to the hydrophilic part W1 in the wiping return path.

  Furthermore, according to the present embodiment, the water repellent surface 42 of the water repellent part W2 is inclined obliquely upward. Therefore, when the wiper 20 moves from the water repellent part W2 to the hydrophilic part W1, the wiper 20 can enter the hydrophilic part W1 while gradually curving the tip of the wiper 20 in accordance with the inclination of the water repellent surface 42. As a result, damage to the wiper 20 can be suppressed as compared with the case where the tip of the wiper 20 is curved by raising the wiper 20 in the upward direction D1 toward the hydrophilic part W1 and pressing the wiper 20 against the hydrophilic part W1.

  Furthermore, according to the present embodiment, the control unit 50 moves the wiper 20 to the moving mechanism 30 so that the ink Nf discharged from the nozzle 11 and remaining in the first area A1 moves to the hydrophilic portion W1. (FIG. 4B to FIG. 4D). Therefore, the wiper 20 can adhere the low-viscosity ink Nf to the hydrophilic portion W1. As a result, the expansion of the ink Nf in the wiping return path can be suppressed.

  Further, according to the present embodiment, the control unit 50 causes the moving mechanism 30 to move the wiper 20 so that the wiper 20 moves up or down with respect to the recording head 10 (FIGS. 4A and 4D). ), FIG. 5 (a), and FIG. 5 (e)). Accordingly, the moving mechanism 30 can move the wiper 20 while being in contact with the ink discharge surface 17, or can be moved in the wiping direction D3 or the wiping direction D4 without contacting the wiper 20 with the ink discharge surface 17. .

  Furthermore, according to the present embodiment, it is not necessary to execute the purge process in the wiping return path. Therefore, the consumption amount of the ink Nf used for the purge process can be suppressed.

  Next, the recording head 10 will be described with reference to FIGS. FIG. 6 shows the front of the recording head 10. The ink ejection surface 17 of the recording head 10 is rectangular. A plurality of nozzle formation regions 12 are formed in a staggered pattern along the longitudinal direction of the recording head 10 in the first region A1 of the ink ejection surface 17. A plurality of nozzles 11 are opened in each of the trapezoidal nozzle formation regions 12. In FIG. 6, the wiper 20 is disposed at a standby position directly below the third region A3. The width of the wiper 20 is larger than the width of the ink ejection surface 17. The width of the wiper 20 may be the same as the width of the ink discharge surface 17 or may be smaller than the width of the ink discharge surface 17 as long as the wiper 20 is large enough to include the nozzle formation region 12. A hydrophilic portion W1 is disposed in the second region A2.

  FIG. 7 shows a side surface of the recording head 10. The recording head 10 has an inlet 13 and an outlet 15. During the image forming process or the purge process, the ink that has flowed into the inlet 13 from the tank flows into the recording head 10 and flows out from the outlet 15. The ink that has flowed into the recording head 10 is ejected from the nozzle 11 during the image forming process, or discharged from the nozzle 11 during the purge process. In the present embodiment, the wiper 20 performs wet wiping using the ink Nf discharged from the nozzle 11 by the purge process and attached to the ink ejection surface 17.

  Next, the wiper unit 60 will be described with reference to FIGS. 8 and 9. In FIGS. 8 and 9, the hydrophilic portion W1 and the water repellent portion W2 are omitted for simplification of the drawings. FIG. 8 shows a state where the wiper unit 60 is lowered. The control unit 50 controls the wiper unit 60. When executing the wiping, the control unit 50 moves the wiper unit 60 so as to face the line heads 10K, 10C, 10M, and 10Y. In FIG. 8, only three wipers 20 corresponding to the three recording heads 10 included in the line head 10K are shown.

  The moving mechanism 30 of the wiper portion 60 includes a carriage 31, a support frame 35 that supports the carriage 31, a roller 36, a gap roller 37, a lifting member 38, and a bottom portion 39.

  Each of the elevating members 38 includes a lift member 38a and a shaft 38b. The controller 50 drives a drive source (for example, a motor) to rotate the shaft 38b of the elevating member 38 arranged upstream in the wiping direction D3 in the clockwise direction, and the elevating member arranged downstream in the wiping direction D3. The shaft 38b of 38 is rotated counterclockwise. Then, the fallen lift member 38 a stands from the bottom 39. As a result, as shown in FIG. 9, the carriage 31, the roller 36, the gap roller 37, and the wiper 20 rise together with the support frame 35.

  FIG. 9 shows a state where the wiper unit 60 is raised. The gap roller 37 comes into contact with the head housing 18 to keep the position of the wiper 20 in the vertical direction of the wiper 20 raised and pressed against the ink discharge surface 17 constant. The carriage 31 is movably engaged with the support frame 35 via a roller 36. As the carriage 31 moves in the wiping direction D3 or wiping direction D4, the wiper 20 also moves in the wiping direction D3 or wiping direction D4.

  The three wipers 20 for each of the line heads 10C, 10M, and 10Y perform the same operation as the three wipers 20 for the line head 10K by the moving mechanism 30.

  The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof (for example, (1) to (4) shown below). In order to facilitate understanding, the drawings schematically show each component as a main component, and the thickness, length, number, and the like of each component shown in the drawings are different from the actual for convenience of drawing. . Moreover, the shape, dimension, etc. of each component shown by said embodiment are an example, Comprising: It does not specifically limit, A various change is possible in the range which does not deviate substantially from the effect of this invention.

  (1) As described with reference to FIG. 3, the water repellent portion W2 is provided, but the water repellent portion W2 may not be provided. Further, although the water repellent surface 42 is inclined obliquely upward with respect to the ink ejection surface 17, it may be formed in parallel with the hydrophilic surface 41. Furthermore, the water repellent portion W2 may be formed outside the hydrophilic portion W1 with respect to the first region A1, and may be formed in the second region A2. Furthermore, the hydrophilic portion W1 and the water repellent portion W2 do not have to be adjacent to each other, and may be formed at a constant interval.

  (2) As described with reference to FIG. 3, the water-repellent part W2 and the hydrophilic part W1 are formed as separate members. For example, the hydrophilic part (for example, metal or synthetic resin) Alternatively, a water-repellent tape (for example, a fluororesin tape) may be applied to make the hydrophilic region the hydrophilic surface 41 and the water-repellent region the water-repellent surface 42.

  (3) As described with reference to FIG. 2, the head unit 3 includes the four color line heads 10 </ b> K to 10 </ b> Y, but the head unit 3 may include a single color line head or a plurality of colors other than the four color heads. A color line head may also be included.

  (4) As described with reference to FIG. 2, three recording heads 10 are prepared for one color. However, a single recording head 10 may be prepared for one color. A plurality of recording heads 10 other than three may be prepared.

  The present invention can be used in the field of inkjet recording apparatuses.

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 10 Recording head 11 Nozzle 20 Wiper 30 Movement mechanism 41 Hydrophilic surface 42 Water repellent surface W1 Hydrophilic part W2 Water repellent part 50 Control part A1 1st area A2 2nd area A3 3rd area Nv Ink Nf Ink

Claims (9)

A recording having an ink ejection surface including a first area where an ink ejection nozzle is opened, a second area adjacent to one end of the first area, and a third area adjacent to the other end of the first area. Head,
With wiper,
A movement mechanism for moving the wiper along the ink ejection surface in a state where the wiper is in contact with the ink ejection surface;
A control unit that moves the wiper to the moving mechanism;
A hydrophilic portion formed in a part of the second region,
The hydrophilic part has higher hydrophilicity than the part other than the part of the second region,
The controller is
In the forward path, the wiper is moved to the moving mechanism so that the wiper stops at the hydrophilic portion via the first region from the third region,
An ink jet recording apparatus that moves the wiper to the moving mechanism so that the wiper moves from the hydrophilic portion to the third region via the first region in the return path .
A water repellent part having higher water repellency than the second region;
2. The ink jet recording apparatus according to claim 1, wherein the water repellent portion is disposed outside the hydrophilic portion with respect to the first region.
The ink jet recording apparatus according to claim 2, wherein the water repellent portion has a water repellent surface, and the water repellent surface is inclined obliquely upward with respect to the ink ejection surface.
The ink jet recording apparatus according to claim 2, wherein the water repellent part and the hydrophilic part are adjacent to each other.
The control unit moves the wiper to the moving mechanism so that the wiper moves to the third region via the hydrophilic portion and the first region after the wiper contacts the water repellent unit on the return path. The inkjet recording apparatus according to claim 2, wherein the inkjet recording apparatus is moved.
Wherein the control unit, the ink the wiper remaining in the first region is discharged from the nozzle to move to said hydrophilic portion, moving the wiper to said moving mechanism, of claims 1 to 5 The ink jet recording apparatus according to any one of the above.
Wherein the control unit, so that the wiper is raised or lowered with respect to the recording head, moves the wiper to the moving mechanism, an ink jet recording apparatus according to any one of claims 1 to 6.
  The control unit moves the wiper to the moving mechanism so that the wiper stops at the hydrophilic portion for a certain period of time when the wiper stops at the hydrophilic portion in the forward path. An ink jet recording apparatus according to claim 1.
  In the return path, the control unit is configured to enter the hydrophilic portion while curving the tip of the wiper according to the inclination of the water repellent surface after the wiper contacts the water repellent portion. The inkjet recording apparatus according to claim 3, wherein the wiper is moved by a moving mechanism.

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