Inkjet recording apparatus

Abstract

The invention provides an ink jet recording apparatus. The inkjet recording apparatus includes a blade, a protruding member, a holder, a first biasing member, a supply member, and a second biasing member. The protruding member is provided integrally with the blade and protrudes toward the inkjet head. The holder supports the protruding member and the squeegee so as to be swingable about a shaft portion parallel to a nozzle surface of the inkjet head, tilts the squeegee toward a rear side in a traveling direction of a wiping operation in which the squeegee is slid along the nozzle surface, and holds the protruding member in a posture in which a tip portion of the protruding member is positioned further toward a rear side in the traveling direction than the shaft portion. The first biasing member biases the projecting member and the blade toward the inkjet head around the shaft portion. The supply member is provided on the rear side of the nozzle surface in the traveling direction, and supplies the cleaning liquid to the blade by coming into contact with the tip of the blade. The second biasing member biases the supply member toward the inkjet head. When the protruding member and the supply member are not pressed from the inkjet head side, the blade is not in contact with the supply member. Therefore, unnecessary contact of the scraping plate can be reduced.

Description

Technical Field

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

[0002] In an inkjet recording device, it is considered that when the image forming operation is not performed, water evaporates from the ink in the nozzle of the inkjet head, and the viscosity of the ink increases, which may cause the nozzle to be clogged. Therefore, in order to prevent clogging, a purge process is performed to discharge the ink in the nozzle to the end cap. However, if the ink remaining on the nozzle surface is left alone, there is the following problem: the ink falls onto the sheet or the ink is fixed to the nozzle surface during the image forming operation. Therefore, a technology for removing the ink remaining on the nozzle surface is being studied. For example, a structure is proposed to remove the ink from the nozzle surface by sliding a scraper (blade) in contact with the nozzle surface.

[0003] In the above structure, since the inkjet head is provided with a supply component for supplying the cleaning liquid to the nozzle surface, there is a concern that the sheet material may be contaminated or the supply component may be damaged when the sheet material contacts the supply component during image formation. Therefore, a structure in which the supply component is retracted together with the scraper is considered. However, if the scraper and the supply component continue to contact each other, there is a concern that deformation may remain on the scraper. In addition, if the scraper is reciprocated while in contact with the nozzle surface, there is a concern that the nozzle surface or the scraper may be damaged. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to reduce unnecessary contact of the scraper.

[0005] The inkjet recording device according to the present invention comprises a scraper, a protruding member, a holder, a first force-applying member, a supply member and a second force-applying member. The protruding member is integrally provided with the scraper and protrudes toward the inkjet head. The holder supports the protruding member and the scraper in a manner that they can swing around an axis portion parallel to the nozzle surface of the inkjet head, and tilts the scraper toward the rear side of the travel direction of the wiping action that slides the scraper along the nozzle surface, and holds the protruding member in a posture in which the top end portion of the protruding member is located at a position further back than the axis portion in the travel direction. The first force-applying member applies force to the protruding member and the scraper toward the inkjet head around the axis portion. The supply member is provided at a position further back than the nozzle surface in the travel direction, and supplies cleaning liquid to the scraper by contacting with the top end portion of the scraper. The second force-applying member applies force to the supply member toward the inkjet head. When the protruding member and the supplying member are not pressed from the inkjet head side, the scraper does not come into contact with the supplying member. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a perspective view showing the appearance of an image forming system according to an embodiment of the present invention.

[0007] Figure 2 It is a front view schematically showing the internal structure of the inkjet recording device according to one embodiment of the present invention.

[0008] Figure 3 It is a front view schematically showing a head unit and a maintenance device according to an embodiment of the present invention.

[0009] Figure 4 It is a plan view schematically showing a head unit and a wiping unit according to an embodiment of the present invention.

[0010] Figure 5 It is a plan view schematically showing an end cap unit according to an embodiment of the present invention.

[0011] Figure 6 It is a cross-sectional view showing an ink jet head according to an embodiment of the present invention.

[0012] Figure 7 It is a perspective view showing a wiping unit and a cleaning liquid supply source according to an embodiment of the present invention.

[0013] Figure 8 It is a perspective view showing a wiping unit according to an embodiment of the present invention.

[0014] Fig. 9 It is a perspective view showing a scraper unit according to an embodiment of the present invention.

[0015] Fig.10 It is a perspective view showing a cross section of a scraper unit according to an embodiment of the present invention.

[0016] Fig.11 It is a perspective view showing a protrusion member and a scraper according to an embodiment of the present invention.

[0017] Fig.12 It is a perspective view showing a protrusion member according to an embodiment of the present invention.

[0018] Fig.13 It is a perspective view showing a receiving member according to an embodiment of the present invention.

[0019] Fig.14 It is a perspective view showing a receiving member according to an embodiment of the present invention.

[0020] Fig.15 It is a perspective view showing a cleaning liquid supply unit and a scraper unit according to an embodiment of the present invention.

[0021] Fig.16 It is a right side view showing a cleaning liquid supply portion and a scraper unit according to an embodiment of the present invention.

[0022] Fig.17 It is a right side view showing a cleaning liquid supply portion and a scraper unit according to an embodiment of the present invention.

[0023] Fig.18 It is a perspective view showing a cleaning liquid supply unit according to an embodiment of the present invention.

[0024] Fig.19 It is a perspective view showing a cross section of a cleaning liquid supply unit and a cleaning liquid supply source according to an embodiment of the present invention.

[0025] Fig. 20 It is a perspective view showing a cross section of a cleaning liquid supply unit and a cleaning liquid supply source according to an embodiment of the present invention.

[0026] Fig.21 It is a perspective view showing a cross section of a cleaning liquid supply unit and a cleaning liquid supply source according to an embodiment of the present invention.

[0027] Fig. 22 It is a perspective view showing a cross section of a cleaning liquid supply unit and a cleaning liquid supply source according to an embodiment of the present invention.

[0028] Fig.23 It is a front view showing the operation of the maintenance device according to one embodiment of the present invention.

[0029] Fig.24It is a plan view showing the operation of the wiping unit according to one embodiment of the present invention.

[0030] Fig.25 It is a right side view showing the operation of the wiping unit according to the embodiment of the present invention.

[0031] Fig.26 It is a right side view showing the operation of the wiping unit according to the embodiment of the present invention.

[0032] Fig. 27 It is a right side view showing the operation of the wiping unit according to the embodiment of the present invention.

[0033] Fig.28 It is a right side view showing the operation of the wiping unit according to the embodiment of the present invention.

[0034] Fig.29 It is a right side view showing the operation of the wiping unit according to the embodiment of the present invention.

[0035] Fig.30 It is a right side view showing the operation of the wiping unit according to the embodiment of the present invention. DETAILED DESCRIPTION

[0036] Next, refer to the attached Figure 1 An inkjet recording device 1 according to an embodiment of the present invention will be described.

[0037] Figure 1 It is a perspective view showing the appearance of the image forming system 100 . Figure 2 It is a front view schematically showing the internal structure of the inkjet recording device 1 . Figure 3 It is a front view schematically showing the head unit 11 and the maintenance device 30 . Figure 4 It is a plan view schematically showing the head unit 11 and the wiping unit 32 . Figure 5 1 is a plan view schematically showing the end cap unit 31 . Figure 6 1 is a cross-sectional view showing the inkjet head 12. Figure 2 The front side of the paper in the figure is the front side (front side) of the inkjet recording device 1, and the left and right directions are described based on the direction of viewing the inkjet recording device 1 from the front. In each figure, U, Lo, L, R, Fr, and Rr represent up, down, left, right, front, and back, respectively.

[0038] Image forming system 100 (see Figure 1) includes a paper supply device 110, an inkjet recording device 1, a drying device 120, and a post-processing device 130. The paper supply device 110 stores thousands of sheets and supplies the sheets to the inkjet recording device 1. The inkjet recording device 1 forms an image on the sheet by inkjet method. The drying device 120 heats the sheet conveyed from the inkjet recording device 1 to dry the ink. The post-processing device 130 performs post-processing such as punching, binding, and folding on the sheet conveyed from the drying device 120.

[0039] Inkjet recording device 1 (refer to Figure 2 ) has a main body shell 3 in the shape of a rectangular parallelepiped. In the central part of the main body shell 3, there is provided a conveying unit 7 for sucking a sheet and conveying it in the Y direction. Above the conveying unit 7, there is provided an imaging unit 6 for discharging ink to form an image. On the right side of the main body shell 3, there is provided a paper feed port 8 for introducing a sheet from a paper feed device 110. On the left side of the main body shell 3, there is provided a discharge port 9 for discharging the sheet with an image formed thereon to a drying device 120. Inside the main body shell 3, there is provided a conveying path 10 that starts from the paper feed port 8 and passes through the gap between the conveying unit 7 and the imaging unit 6 to reach the discharge port 9. A registration roller 18 is provided at a position upstream of the conveying unit 7 in the conveying direction Y.

[0040] The conveying unit 7 includes an endless conveyor belt 21 and a suction portion 24. The conveyor belt 21 has a plurality of air holes (not shown in the figure), and is wound around a driving roller 25 and a driven roller 22. The upper surface of the suction portion 24 has a plurality of air holes (not shown in the figure), and is in contact with the inner surface of the conveyor belt 21. The suction portion 24 sucks air through the air holes of the conveyor belt 21 and the air holes of the suction portion 24, thereby adsorbing the sheet to the conveyor belt 21. The driving roller 25 is driven counterclockwise by a driving portion (not shown in the figure) including a motor and a reduction gear, thereby rotating the conveyor belt 21 in the counterclockwise direction, and the sheet adsorbed to the conveyor belt 21 is conveyed along the Y direction.

[0041] The imaging unit 6 includes a plurality of (four in this embodiment) head units 11. The head units 11 (see Figure 3 , Figure 4 ) has one or more (three in this embodiment) inkjet heads 12. Each head unit 11 is connected to an ink cartridge 20 filled with black, cyan, magenta, and yellow inks.

[0042] Inkjet head 12 (see Figure 6) has a rectangular parallelepiped housing 12H with the front-to-back direction as the longitudinal direction, a nozzle plate 14 provided at the bottom of the housing 12H, and a sleeve (socket) 12S for connecting a pipe for supplying ink. The nozzle plate 14 has a plurality of nozzles 14N arranged in the front-to-back direction. The nozzle 14N has a branch flow path 14B branching from the downstream side of the sleeve 12S, and an outlet 14A provided on the lower surface of the nozzle plate 14, i.e., the nozzle surface 14F. The vibration plate 14V also serves as a part of the inner wall of the branch flow path 14B. A pressure element 14Z is provided on the vibration plate 14V. As the pressure element 14Z, a piezoelectric element, an electrostatic actuator, a heater, etc. are used. A driving circuit 12D for driving the pressure element 14Z is connected to the pressure element 14Z.

[0043] Control unit 2 (refer to Figure 2 ) has a computing unit and a storage unit (not shown). The computing unit is, for example, a CPU (Central Processing Unit). The storage unit includes storage media such as ROM (Read Only Memory), RAM (Random Access Memory), and EEPROM (Electrically Erasable Programmable Read Only Memory). The computing unit performs various processes by reading and executing the control program stored in the storage unit. In addition, the control unit 2 can also be implemented by an integrated circuit without using software.

[0044] A display operation unit 19 (see Figure 1 , Figure 2 The display operation unit 19 includes a display panel, a touch screen and a keyboard (not shown) stacked on the display panel. The control unit 2 displays a screen showing an operation menu, status, etc. of the inkjet recording device 1 on the display panel, and controls each unit of the inkjet recording device 1 according to the operation detected by the touch screen and the keyboard.

[0045] The basic image forming operation of the inkjet recording device 1 is as follows. When an image forming job is input to the inkjet recording device 1 from the display operation unit 19, an external computer, etc., the paper feed device 110 feeds the sheet to the conveying path 10 through the paper feed port 8, and the registration roller 18 whose rotation is stopped corrects the skew of the sheet. When the registration roller 18 feeds the sheet to the conveying unit 7 at a predetermined timing, the conveying unit 7 adsorbs the sheet to the conveying belt 21 and conveys it in the Y direction. Ink is discharged from the inkjet head 12 to the sheet to form an image on the sheet. The sheet with the image formed is discharged to the drying device 120 through the discharge port 9.

[0046] [Maintenance device] Next, the maintenance device 30 will be described. Figure 2 ) have the same structure, and the four maintenance devices 30 have the same structure. Therefore, the following describes one head unit 11 and one maintenance device 30 that performs maintenance on the head unit 11.

[0047] [Head base] The head unit 11 includes a head base 11B (see Figure 3 , Figure 4 , Figure 6 ). Three inkjet heads 12 are arranged alternately on the head base 11B. The head base 11B is a roughly rectangular plate-shaped member with the front-to-back direction as the longitudinal direction. The head base 11B has a through hole (not shown) for inserting the nozzle plate 14 of the inkjet head 12. The lower surface of the head base 11B is a surface parallel to the nozzle surface 14F (hereinafter referred to as the parallel surface 11P). The nozzle surface 14F protrudes downward from the parallel surface 11P.

[0048] Maintenance device 30 (see Figure 3 ) is disposed on the side of the head unit 11 (in this embodiment, on the upstream side (right side) in the conveying direction Y). The maintenance device 30 includes an end cap unit 31 , a wiping unit 32 , and a cleaning liquid supply source 13 .

[0049] [End cap unit] End cap unit 31 (refer to Figure 3 , Figure 5 ) has the same number of end caps 72 as the inkjet heads 12 included in the head unit 11 (three in the present embodiment). The three end caps 72 are arranged in a staggered manner similar to the inkjet heads 12 and are supported by the frame 71.

[0050] [Wipe unit] Wiping unit 32 (see Figure 3 , Figure 4 ) has a waste liquid tray 81, a scraper 82 and a cleaning liquid supply unit 40. The waste liquid tray 81 has the same number of recesses 81U as the inkjet heads 12 of the head unit 11. The plurality of recesses 81U are arranged in a staggered manner like the inkjet heads 12. The scraper 82 and the cleaning liquid supply unit 40 are provided in each of the recesses 81U.

[0051] [Head lifting device] Fig.23 11L (see FIG. 11B ) is a front view showing the operation of the maintenance device 30. Figure 4 ) are provided on both the front and rear sides of the head base 11B. The head lifting device 11L is composed of, for example, a ball screw, a belt drive device, etc. The head lifting device 11L moves the head unit 11 to the image forming position (refer to Fig.23 (A)) and the retreat position (refer to Fig.23 The image forming position refers to a position where the distance between the conveying path 10 (the upper surface of the conveying belt 21) for conveying the sheet and the nozzle surface 14F is a predetermined distance suitable for image formation. The retreat position refers to a position above the image forming position where the head unit 11 does not interfere with the wiping unit 32 when the end cap sliding device 34 described later is used to slide the end cap unit 31 and the wiping unit 32 in the horizontal direction.

[0052] [End cover sliding device] End cover sliding device 34 (refer to Figure 5 ) are provided on both the front and rear sides of the frame 71 of the end cap unit 31. The end cap sliding device 34 is composed of, for example, a ball screw, a belt drive device, etc. The end cap sliding device 34 enables the end cap unit 31 to be in the starting position (refer to Fig.23 (A)) and maintenance position (refer to Fig.23 The home position refers to a position on the right side of the head unit 11 at the image forming position. The maintenance position refers to a position below the head unit 11 at the retracted position.

[0053] [Wipe lift device] Wiping lifting device 35 (refer to Figure 4 ) are provided on both sides of the waste liquid tray 81 of the wiping unit 32. The wiping lifting device 35 is composed of, for example, a cam mechanism, a ball screw, etc. The wiping lifting device 35 makes the wiping unit 32 in the contact position (refer to Fig.23 (B)) and separation position (refer to Fig.23 The contact position refers to the position where the waste liquid tray 81 contacts the end cover 72. The separation position refers to the position where the waste liquid tray 81 is upwardly separated from the end cover 72 by a predetermined distance.

[0054] When the wiping unit 32 is in the contact position, the wiping unit 32 is placed on the end cap unit 31, so the wiping unit 32 slides to the home position and the maintenance position together with the end cap unit 31 by operating the end cap sliding device 34. That is, the end cap sliding device 34 has the function of a wiping sliding device that slides the wiping unit 32 to the home position and the maintenance position. When the wiping unit 32 is in the separation position, the end cap unit 31 slides to the home position and the maintenance position alone by operating the end cap sliding device 34 while the wiping unit 32 stays in the home position.

[0055] [Wipe unit] Next, the structure of the wiping unit 32 will be described in detail. Figure 7 It is a perspective view showing the wiping unit 32 and the cleaning liquid supply source 13 . Figure 8It is a perspective view showing the wiping unit 32 . Fig. 9 It is a perspective view showing the scraper unit 90 . Fig.10 It is a perspective view showing a cross section of the scraper unit 90 . Fig.11 It is a perspective view showing the protruding member 91 and the scraper 82 . Fig.12 It is a perspective view showing the protruding member 91 .

[0056] Wiping unit 32 (see Figure 7 ) has a plurality of (three in this embodiment) scraper units 90, a waste liquid tray 81, and a carriage 83. The scraper unit 90 (see Fig.11 , Fig.12 ) has a scraper 82, a protruding member 91, a retainer 92 and a first force applying member 93.

[0057] [Scraper] Scraper 82 (refer to Figures 9 to 11 ) is a flexible, substantially rectangular plate-shaped member formed of resin or the like. The scraper 82 is held in the holder 92 in a slightly backward tilted posture with the front-to-back direction as the thickness direction. The width of the scraper 82 in the left-right direction is greater than the width of the nozzle surface 14F. The upper portion of the scraper 82 has a taper that becomes thinner as it approaches the top end.

[0058] [Protruding parts] Protruding member 91 (see Figures 9 to 12 ) is integrated with the scraper 82. The protruding member 91 includes a base 91B parallel to the scraper 82, a first bent portion 911 bent backward from the upper end of the base 91B, a second bent portion 912 bent upward from the rear end of the first bent portion 911, a rearwardly inclined portion 91T inclined backward than the second bent portion 912, and protruding portions 91P protruding upward from the left and right ends of the rearwardly inclined portion 91T and inclined backward at the same inclination angle as the rearwardly inclined portion 91T.

[0059] The width of the base 91B in the left-right direction is equal to the width of the scraper 82. The length of the base 91B in the up-down direction is shorter than the length of the scraper 82 in the up-down direction. The base 91B is joined to the lower part of the rear surface of the scraper 82. The width of the first curved portion 911 and the second curved portion 912 in the left-right direction is equal to the width of the base 91B. The width of the rearward tilting portion 91T in the left-right direction is wider than the width of the base 91B. The position of the protrusion 91P in the left-right direction is positioned at a position where the top end of the protrusion 91P can contact the left and right parallel surfaces 11P of the nozzle surface 14F.

[0060] On the rear surface of the base 91B, two wall portions 91C facing each other in the left-right direction are provided (see Fig.11 , 12). A shaft portion 91S protruding to the left is provided on the left surface of the left wall portion 91C. A shaft portion 91S protruding to the right is provided on the right surface of the right wall portion 91C.

[0061] A through hole 91A (see FIG. 9A ) penetrating downward is provided at the center of the first curved portion 911 in the left-right direction. Fig.11 , Fig.12 ). At least a portion of the waste liquid W (a mixture of ink and cleaning liquid) flowing down along the rear surface of the scraper 82 falls downward through the through hole 91A.

[0062] [Fixed parts] The fixing member 94 (see Figures 9 to 11 ) The scraper 82 is fixed to the protruding member 91. The lower part of the scraper 82 is clamped by the base 91B of the protruding member 91 and the fixing member 94, and the fixing member 94 is fastened to the protruding member 91. The lower edge of the fixing member 94 and the lower edge of the protruding member 91 have a taper that becomes narrower as the width in the left-right direction becomes narrower toward the bottom (see Fig. 9 , Fig.12 The waste liquid flowing from the front surface of the scraper 82 to the front surface of the fixing member 94 is gathered along the lower edge of the fixing member 94 and the lower edge of the protruding member 91 to the center in the left-right direction and falls into the recessed portion 81U of the waste liquid tray 81.

[0063] [Retainer] Retainer 92 (see Figures 9 to 11 ) The scraper 82 is held by the protruding member 91. An axial hole 92H for inserting the shaft portion 91S of the protruding member 91 is provided at the lower part of the retainer 92. The protruding member 91 can swing in the front-back direction with the shaft portion 91S as the center. The scraper 82 swings together with the protruding member 91. The scraper 82 and the protruding member 91 are arranged on the retainer 92 in an inclined posture relative to the left-right direction so that the waste liquid W flows in either direction of the left-right direction. In the example shown in the figure, the left end of the scraper 82 is inclined in a manner that is located slightly behind the right end, but it can also be inclined in the opposite direction.

[0064] [First force applying member] The first biasing member 93 (see Fig.11 , 12 ) is, for example, a torsion coil spring, which is wound around the shaft portion 91S. One end of the first urging member 93 is engaged with the retainer 92, and the other end is engaged with the protruding member 91. The first urging member 93 is Fig. 9 , Fig.10 The protruding member 91 is forced in the counterclockwise direction. Fig.11In other words, the first urging member 93 urges the scraper 82 in a direction that presses the tip of the scraper 82 against the nozzle surface 14F. The first urging member 93 may be a leaf spring, a compression coil spring, or the like.

[0065] [Waste Tray] Waste liquid tray 81 (refer to Figure 7 , Figure 8 ) is formed as a whole into a rectangle with the front-to-back direction as the length direction. The waste liquid tray 81 has three recesses 81U with an upper opening. The three recesses 81U are arranged alternately in the same manner as the inkjet head 12. The recesses 81U are formed into a rectangle elongated in the front-to-back direction when viewed from above. The length of the recess 81U in the front-to-back direction is longer than that of the nozzle surface 14F, and the width of the recess 81U in the left-to-right direction is wider than that of the nozzle surface 14F. The recess 81U receives waste liquid including ink and cleaning liquid.

[0066] [Slide] Slide 83 (see Figures 7 to 10 ) is formed into a plate shape with the front-to-back direction as the length direction. A groove 81G along the front-to-back direction is provided between the left and right recesses 81U, and the slide 83 is accommodated in the groove 81G. The length of the slide 83 in the front-to-back direction is shorter than the length of the groove 81G in the front-to-back direction. The slide 83 can slide in the front-to-back direction along the groove 81G.

[0067] The three concave portions 81U respectively accommodate the squeegee units 90. The three squeegee units 90 are coupled to the carriage 83. The three squeegee units 90 are arranged on the carriage 83 so as to be located behind the nozzle surface 14F when the carriage 83 is located at the rearmost position.

[0068] [Carriage drive device] The waste liquid tray 81 is provided with a carriage driving device 36 (see Figure 4 The carriage drive device 36 is composed of, for example, a belt drive device, a feed screw, etc., and slides the carriage 83 along the groove 81G to slide the scraper 82. The scraper 82 is slid forward (an example of the travel direction A of the wiping action) to perform a wiping action in which the scraper 82 scrapes ink off the nozzle surface 14F. Figure 7 The scraper 82 is shown in the state where it is located at the starting position of the wiping operation. Figure 8 The scraper 82 is shown at the end position of the wiping operation.

[0069] [Connecting parts] Fig.13 , Fig.14 84 is a perspective view showing the receiving member 84. The receiving member 84 is supported by the waste liquid tray 81 (see Figure 7 , Figure 8 , Fig.10). The receiving member 84 is provided at the front end of each of the three recesses 81U. The receiving member 84 has a front portion 84F facing the front surface of the scraper 82, a top portion 84T provided rearward from the upper end of the front portion 84F, and side wall portions 84W provided rearward from the left and right ends of the front portion 84F. That is, the receiving member 84 is formed in a box shape with the rear side and the lower side opened.

[0070] When the scraper 82 reaches the frontmost part of the recess 81U, the scraper 82 is accommodated in the receiving member 84. At this time, the scraper 82 is surrounded from the front, the top, and the left and right sides by the receiving member 84. In addition, either the top 84T or the side wall 84W may be provided.

[0071] [Cleaning fluid supply unit] Next, the cleaning liquid supply unit 40 will be described. Fig.15 It is a perspective view showing the cleaning liquid supply unit 40 and the scraper unit 90 . Fig.16 , Fig.17 It is a right side view showing the cleaning liquid supply unit 40 and the scraper unit 90 . Fig.18 It is a perspective view showing the cleaning liquid supply unit 40 . Figures 19 to 22 1 is a perspective view showing a cross section of the cleaning liquid supply unit 40 and the cleaning liquid supply source 13. The cleaning liquid supply unit 40 includes a supply member 41, a connection member 42, and a conveying member 44.

[0072] [Supply parts] The supply member 41 has a base end portion 51, a middle portion 52, and a receiving portion 53 in order from the rear. The upper surface of the supply member 41 is flat and rectangular when viewed from above. The portion of the parallel surface 11P of the head base 11B that is further rearward than the nozzle plate 14 faces the upper surface of the supply member 41 and also serves as a pressing portion 11D that presses down the supply member 41. In addition, the pressing portion 11D may be provided as a component independent of the head base 11B.

[0073] The left side surface and the right side surface of the base end portion 51 are provided with arm support portions 51L protruding to the left and the right, respectively (see Fig.18 The left and right arm support portions 51L are respectively provided with arm portions 51A protruding forward (see Figures 16 to 18 The shaft portion 51S protrudes from the left side surface of the left arm portion 51A and the right side surface of the right arm portion 51A. A boss 51B is provided behind the left and right shaft portions 51S.

[0074] The thickness of the middle portion 52 in the vertical direction is thinner than that of the base end portion 51 (see Figures 16 to 18The lower surface of the intermediate portion 52 is flat. The lower surface of the receiving portion 53 has a first inclined surface 531 and a second inclined surface 532 provided at a position forward of the first inclined surface 531. The first inclined surface 531 is inclined such that the front side is lower than the rear side (see Fig.16 , Fig.17 ). The second inclined surface 532 is inclined in a manner that the front side is higher than the rear side. The first inclined surface 531 is continuous with the lower surface of the middle portion 52. Therefore, a space wider than the lower portion of the receiving portion 53 is formed below the middle portion 52 (hereinafter referred to as a non-contact space 52U).

[0075] The storage portion 53 is a hollow structure having a storage space 53V for storing the cleaning liquid (see Fig.16 , Fig.17 In the storage space 53V, it is desirable to provide a cleaning liquid holding member 53H (see Fig.21 , Fig. 22 On the upper surface of the storage portion 53, a suction port 53N for sucking the cleaning liquid is provided (see Fig.15 , Fig.21 , Fig. 22 A discharge port 53E for discharging the cleaning liquid is provided on the lower surface of the housing portion 53 (see Fig.16 , Fig.17 The thickness of the front end portion of the housing portion 53 in the vertical direction (the distance from the front end portion of the second inclined surface 532 to the upper surface) is slightly greater than the distance from the lower surface of the head base 11B to the nozzle surface 14F.

[0076] [Connection parts] The connecting member 42 is disposed on both sides of the supply member 41 (see Figures 15 to 18 ). The lower part of the left and right connecting members 42 uses a shaft 42S with the left and right direction as the longitudinal direction (refer to Fig.18 ) is connected. The shaft 42S is rotatably supported by the recess 81U of the waste liquid tray 81. Specifically, in the waste liquid tray 81, a notch 81K is formed downward from the upper end of the left and right side walls of the recess 81U (see Fig.19 , Fig. 20 ). The left and right ends of the shaft 42S are supported by the notch portion 81K. The connecting member 42 is capable of swinging around the shaft 42S.

[0077] The upper portions of the left and right connecting members 42 are provided with shaft holes 42H (see Figures 16 to 18). The shaft hole 42H is arranged at a position forward of the shaft 42S. A long hole 42L is provided behind the shaft hole 42H for inserting the boss 51B of the supply member 41. The supply member 41 can swing relative to the connecting member 42 within the range of the length direction of the long hole 42L with the shaft portion 51S as the center (refer to Fig.16 , Fig.17 ).

[0078] [Second force applying member] The connecting member 42 is provided with a second biasing member 43 (see Fig.18 Specifically, the second urging member 43 is a torsion coil spring, which is wound around the shaft 42S. One end of the second urging member 43 is engaged with the retainer 92, and the other end is engaged with the connecting member 42 (see Fig.16 , Fig.17 The second force applying member 43 applies force to the connecting member 42. Fig.16 , Fig.17 In other words, the second urging member 43 urges the supply member 41 in a direction close to the inkjet head 12. In addition, the second urging member 43 may also be a leaf spring, a compression coil spring, or the like.

[0079] [Transmission parts] The conveying member 44 is joined to the second inclined surface 532. The conveying member 44 has an inclination angle equal to that of the second inclined surface 532. The conveying member 44 is a rectangular sheet-like member formed of resin or the like and has flexibility. The front end of the conveying member 44 protrudes forward from the front end of the receiving portion 53. A discharge port 44A is provided at a position of the conveying member 44 corresponding to the discharge port 53E of the receiving portion 53 (see FIG. 4A). Fig.18 ).

[0080] [Cleaning fluid supply source] Cleaning liquid supply source 13 (see Figure 7 ) supplies cleaning liquid to the supply component 41. Cleaning liquid is a liquid with water as the main component. The cleaning liquid supply source 13 has a storage tank 13T, a pump 13P, a supply flow path 13C and a support plate 13B. Cleaning liquid is stored in the storage tank 13T. The supply flow path 13C is branched into three on the downstream side of the pump 13P. The branched supply flow paths 13C are respectively connected to valves 13V. The valve 13V is, for example, a check valve. The three valves 13V are respectively arranged above the suction port 53N of the supply component 41. The supply flow path 13C and the valve 13V are supported on the support plate 13B. The valve 13V penetrates the support plate 13B, and the discharge port of the valve 13V protrudes from the lower surface of the support plate 13B.

[0081] A supply source lifting device 13L (see Figure 7). The supply source lifting device 13L is composed of, for example, a cam mechanism, a ball screw, etc. The supply source lifting device 13L makes the support plate 13B in the supply position (refer to Fig.23 (A)) and the retreat position (refer to Fig.23 The supply position is the position where the discharge port of valve 13V is inserted into the suction port 53N (refer to Fig. 20 , Fig. 22 The retracted position is a position where the discharge port of the valve 13V is retracted upward from the suction port 53N (see Fig.19 , Fig.21 ).

[0082] A convex portion 13BT (see FIG. 1B ) protruding downward is provided on the lower surface of the support plate 13B at a position corresponding to the protrusion 91P of the protrusion member 91. Figures 19 to 22 ). In addition, on the lower surface of the support plate 13B, convex portions 13BS protruding downward are provided on both the left and right sides of the valve 13V (see Fig.19 , Fig. 20 ).

[0083] [Overview of the operation of the wiping unit] Next, the outline of the operation of the wiping unit 32 will be described. Fig.24 It is a plan view showing the operation of the wiping unit 32 . Figures 25 to 30 It is a right side view showing the operation of the wiping unit 32. In addition, here, the outline of the operation of the wiping unit 32 is described, and the operation of the protruding member 91 and the supply member 41 will be described later.

[0084] Next, let Fig.23 (A) Fig.24 The state shown in (A) is described as an initial state. In the initial state, the head unit 11 is located at the image forming position (refer to Fig.23 In (A), the end cap unit 31 is located at the starting position, the wiping unit 32 is located at the starting position and at the contact position, and the cleaning liquid supply source 13 is located at the supply position. The scraper 82 is located at the wiping action start position (refer to Fig.24 (A) in FIG. 1 ). A predetermined amount of cleaning liquid is supplied from the cleaning liquid supply source 13 to the cleaning liquid supply unit 40. The control unit 2 executes the following processing at a predetermined timing. The so-called predetermined timing refers to, for example, the timing at which the viscosity of the ink in the nozzle 14N is expected to increase, specifically, the situation where the period during which the image forming operation is not performed continues for a predetermined period.

[0085] First, the control unit 2 operates the head lifting device 11L to raise the head unit 11 to the retracted position (see Fig.23In addition, the control unit 2 operates the supply source lifting device 13L to raise the cleaning liquid supply source 13 to the retracted position.

[0086] Next, the control unit 2 operates the end cover sliding device 34 to slide the end cover unit 31 to the maintenance position (see Fig.23 (C) Fig.24 (B) Fig.25 ). At this time, the wiping unit 32 is placed on the end cap unit 31, so the wiping unit 32 also slides to the maintenance position together with the end cap unit 31. Next, the control unit 2 operates the head lifting device 11L to lower the head unit 11 to the height for performing the wiping operation (hereinafter referred to as the wiping position.) (refer to Fig.23 (D) Fig.26 ).

[0087] Next, the control unit 2 causes the inkjet head 12 to discharge a predetermined amount of ink, and then operates the carriage drive device 36 to slide the scraper 82 forward along the nozzle surface 14F (see Fig.24 (C) Fig. 27 , Fig.28 , Fig.29 The scraper 82 scrapes off the cleaning fluid F that bulges out from the discharge port 44A (see Fig. 27 ) and moves along the nozzle surface 14F (refer to Fig.28 , Fig.29 ). On the nozzle surface 14F, the residual ink K is diluted by the cleaning liquid F carried by the scraper 82. The waste liquid including the residual ink K and the cleaning liquid F is scraped off by the scraper 82 and falls into the concave portion 81U.

[0088] Next, the control unit 2 operates the head lifting device 11L to raise the head unit 11 to the retracted position (see Fig.23 (C) Fig.30 Then, the control unit 2 operates the carriage drive device 36 to return the scraper 82 to the wiping operation start position (see Fig.24 (B) Fig.25 ). Next, the control unit 2 operates the end cap sliding device 34 to slide the end cap unit 31 and the wiping unit 32 toward the starting position (refer to Fig.23 (B) Fig.24 (A) in the figure.

[0089] Next, the control unit 2 operates the wiping lifting device 35 to raise the wiping unit 32 to the separation position (see Fig.23 Next, the control unit 2 operates the end cover sliding device 34 to slide the end cover unit 31 to the maintenance position (see Fig.23 (F) Fig.24At this time, the wiping unit 32 is separated from the end cover unit 31, so the wiping unit 32 stays at the starting position, and only the end cover unit 31 slides to the maintenance position.

[0090] Next, the control unit 2 operates the head lifting device 11L to lower the head unit 11 to a height where the nozzle surface 14F contacts the end cap 72 (hereinafter referred to as the end cap position). (See Fig.23 In this way, the end cap 72 is mounted on the nozzle surface 14F.

[0091] When an image forming job is to be executed, the control unit 2 operates the head lifting device 11L to raise the head unit 11 to the retracted position (see Fig.23 (F) in the figure, the end cover sliding device 34 is operated to slide the end cover unit 31 to the starting position (refer to Fig.23 (E) in the figure), the wiping lifting device 35 is operated to lower the wiping unit 32 to the contact position (refer to Fig.23 Then, the control unit 2 operates the head lifting device 11L to lower the head unit 11 to the image forming position (see Fig.23 (A) in the figure, an image forming job is executed.

[0092] [Operations of the protruding member and the supplying member] Next, the operation of the protruding member 91 and the supply member 41 will be described. Fig.16 The protruding member 91 and the supply member 41 are not pressed down (hereinafter referred to as the non-pressed state). Fig.17 This shows a state where the protruding member 91 is pressed down by the parallel surface 11P or the convex portion 13BT, and the supply member 41 is pressed down by the pressing portion 11D or the convex portion 13BS (hereinafter referred to as the pressed state). Fig.16 , Fig.17 In addition, the second force applying member 43 applies force to the connecting member 42 in the clockwise direction.

[0093] [Non-pressed state] When the wiping unit 32 is located at the home position and the cleaning liquid supply source 13 is raised to the retracted position, it is in the non-pressed state (see Fig.19 , Fig.21 , Fig.23 In addition, even when the wiping unit 32 is in the maintenance position and the head unit 11 is raised to the retreat position, it is in the non-pressed state (see Fig.23 (C) in the.

[0094] [Press down state] On the other hand, when the wiping unit 32 is located at the home position and the cleaning liquid supply source 13 is lowered to the supply position, it is in the pressed state (see Fig. 20 , Fig. 22 , Fig.23 Specifically, when the cleaning liquid supply source 13 is changed from a non-pressurized state (refer to Fig.16 , Fig.19 , Fig.21 ) when descending (refer to Fig.17 , Fig. 20 , Fig. 22 ), the convex portion 13BT overcomes the first force member 93 to press down the protrusion 91P, and the convex portion 13BS overcomes the second force member 43 to press down the supply member 41. At this time, the discharge port of the valve 13V is inserted into the suction port 53N of the supply member 41 (refer to Fig. 22 ), the cleaning liquid can be supplied from the cleaning liquid supply source 13 to the cleaning liquid supply unit 40.

[0095] In addition, even when the wiping unit 32 is located at the maintenance position and the head unit 11 is lowered to the wiping position, it is in the pressed down state (see Fig.23 When the head unit 11 is in a non-pressed state (refer to Fig.16 ) when descending (refer to Fig.17 ), the parallel surface 11P overcomes the first force applying member 93 to press down the protruding portion 91P, and the pressing portion 11D overcomes the second force applying member 43 to press down the supply member 41.

[0096] When the non-pressed state is transferred to the pressed state, the protrusion 91P is pressed down, and the scraper 82 swings clockwise. Fig.17 ) is lower than the inclination angle β of the vertical line V in the non-pressed state (refer to Fig.16 ) is large. In addition, the supply member 41 is pressed down, whereby the connecting member 42 swings counterclockwise. Therefore, in the pressed state, the supply member 41 moves forward and downward compared to the non-pressed state.

[0097] Here, when focusing on the top end of the scraper 82, in the non-pressed state, the top end of the scraper 82 is located below the first inclined surface 531 of the supply member 41. On the other hand, in the pressed state, relatively, the top end of the scraper 82 moves backward and downward, and the supply member 41 moves forward and downward, but the top end of the scraper 82 enters the non-contact space 52U below the middle portion 52 of the supply member 41, thereby avoiding interference between the scraper 82 and the supply member 41.

[0098] [wiping action] Next, the wiping operation will be described in detail. When the head unit 11 is raised to the retreat position and the wiping unit 32 is slid to the maintenance position (see Fig.23 (C) Fig.24 (B) Fig.25 ), the protruding member 91 and the supply member 41 are in a non-pressed state (refer to Fig.16 At this time, the rear end surface of the nozzle plate 14 and the front end surface of the supply member 41 are separated by a distance D in the front-rear direction (see Fig.25 The cleaning liquid F is discharged from the discharge port 44A (see Fig.18 ) bulge (refer to Fig.25 The residual ink K is attached to the nozzle surface 14F (see Fig.25 ).

[0099] Next, the control unit 2 operates the head lifting device 11L to lower the head unit 11 to the wiping position (see Fig.23 (D) Fig.26 ). Then, the parallel surface 11P presses down the protruding member 91 and the supply member 41, so that the protruding member 91 and the supply member 41 are in a pressed state (refer to Fig.17 ). At this time, the scraper 82 swings from the inclination angle α to the inclination angle β. In addition, since the supply component 41 moves forward, the distance between the front end surface of the supply component 41 and the rear end surface of the nozzle plate 14 is reduced. At this time, the front end surface of the supply component 41 and the rear end surface of the nozzle plate 14 can also contact. In addition, the conveying component 44 moves downward to the nozzle surface 14F, and at least the front end portion of the upper surface of the conveying component 44 contacts the nozzle surface 14F, so that the step between the second inclined surface 532 and the nozzle surface 14F is eliminated.

[0100] Next, the control unit 2 causes the inkjet head 12 to discharge a predetermined amount of ink. Through this operation, the ink with increased viscosity is discharged from the nozzle 14N. Next, the control unit 2 causes the carriage drive device 36 to operate, causing the scraper 82 to slide forward along the nozzle surface 14F (see Fig.24 The scraper 82 scrapes off the cleaning liquid F bulging out from the discharge port 44A (see Fig. 27 ), moves along the lower surface of the conveying member 44 toward the nozzle surface 14F, and then moves along the nozzle surface 14F (refer to Fig.28 ). In addition, Fig. 27 , Fig.28 In the figure, the tip of the scraper 82 overlaps with the supply member 41 and the nozzle plate 14, but in reality, the tip of the scraper 82 is bent rearward.

[0101] When the scraper 82 moves along the nozzle surface 14F, the scraper 82 moves forward in a state where the protruding member 91 contacts the parallel surface 11P, so the inclination angle of the scraper 82 is kept constant. Therefore, the scraper 82 is pressed against the nozzle surface 14F with a constant load. In addition, the scraper 82 is pressed against the nozzle surface 14F mainly by the elastic force of the first force applying member 93. The elastic force of the first force applying member 93 is adjusted to minimize the bending of the scraper 82.

[0102] On the nozzle surface 14F, the residual ink K is diluted by the cleaning liquid F carried by the scraper 82. The waste liquid containing the residual ink K and the cleaning liquid F is scraped off by the scraper 82 and flows down along the front and rear surfaces of the scraper 82. The waste liquid W flowing down along the rear surface of the scraper 82 passes through the through hole 91A of the protruding member 91 and falls into the concave portion 81U (see Fig.11 ). In addition, the waste liquid W falling along the front surface of the scraper 82 is collected along the lower edge of the fixing member 94 and the lower edge of the protruding member 91 to the center in the left-right direction through the front surface of the fixing member 94, and falls into the recessed portion 81U.

[0103] Parallel to the front end of the scraper 82 passing through the nozzle surface 14F (see Fig.29 ), the control unit 2 operates the head lifting device 11L to raise the head unit 11 to the retracted position (refer to Fig.30 ). At this time, the head base 11B also rises, so the protruding member 91 and the supply member 41 return to the non-pressed state. In addition, the scraper 82 is separated from the nozzle surface 14F, thereby eliminating the bending deformation of the scraper 82. Through this action, the waste liquid W is released from the scraper 82 to the receiving member 84. The waste liquid W received by the receiving member 84 flows downward along the inner surface of the receiving member 84 and falls into the recessed portion 81U.

[0104] Assuming that there is no structure (protruding part 91, retainer 92, first force-applying part 93, etc.) for changing the inclination angle of the scraper 82, the scraper 82 can only be pressed against the nozzle surface 14F by the elastic force generated by the bending deformation of the scraper 82 itself. Therefore, when the top end of the scraper 82 passes through the front end of the nozzle surface 14F, the bending of the scraper 82 is suddenly released, and the waste liquid W may be scattered. In contrast, in the present embodiment, compared with the case where there is no structure for changing the inclination angle of the scraper 82, the bending of the scraper 82 is suppressed to a smaller amount. In addition, the inclination of the scraper 82 is restored in parallel with the release of the bending deformation, so the waste liquid W is mainly released forward and received by the receiving part 84, and the scattering of the waste liquid W is suppressed.

[0105] The inkjet recording device 1 according to the present embodiment described above includes a scraper 82, a protruding member 91, a holder 92, a first force applying member 93, a supply member 41, and a second force applying member 43. The protruding member 91 is provided integrally with the scraper 82, and protrudes toward the inkjet head 12. The holder 92 supports the protruding member 91 and the scraper 82 in a manner that allows them to swing around a shaft portion 91S parallel to the nozzle surface 14F of the inkjet head 12, and the scraper 82 is tilted toward the rear side of the travel direction A of the wiping operation in which the scraper 82 slides along the nozzle surface 14F, and the protruding member 91 is held in a posture in which the tip portion of the protruding member 91 is located at a position further to the rear side of the travel direction A than the shaft portion 91S. The first force applying member 93 applies force to the protruding member 91 and the scraper 82 toward the inkjet head 12. The supply member 41 is provided at a position further back than the nozzle surface 14F in the direction of travel A, and supplies the cleaning liquid F to the scraper 82 by contacting the tip of the scraper 82. The second force applying member 43 applies force to the supply member 41 toward the inkjet head 12. When the protruding member 91 and the supply member 41 are not pressed from the inkjet head 12 side, the scraper 82 does not contact the supply member 41. According to this structure, when the protruding member 91 and the supply member 41 are in the non-pressed state described above, the scraper 82 does not contact the supply member 41, so that unnecessary contact of the scraper 82 can be reduced.

[0106] In the inkjet recording device 1 according to the present embodiment, the supply member 41 has the non-contact space 52U, which is a space where the scraper 82 does not contact the supply member 41 when the scraper 82 is located at the wiping operation start position and the protruding member 91 and the supply member 41 are pressed from the inkjet head 12 side. According to this structure, even when the protruding member 91 and the supply member 41 are pressed from the inkjet head 12 side, the contact of the scraper 82 can be avoided by placing the scraper 82 at the wiping operation start position.

[0107] Furthermore, according to the inkjet recording apparatus 1 of the present embodiment, when the scraper 82 starts the wiping operation in a state where the protruding member 91 and the supply member 41 are pressed from the inkjet head 12 side, the cleaning liquid F is supplied to the scraper 82 by the contact between the scraper 82 and the supply member 41. According to this structure, the time for which the scraper 82 and the supply member 41 are in contact can be reduced.

[0108] In addition, the inkjet recording device 1 involved in this embodiment includes a wiping unit 32, a head unit lifting device 11L and a wiping sliding device (end cover sliding device 34). The wiping unit 32 includes a scraper 82, a protruding part 91, a retainer 92, a first force-applying part 93, a supply part 41 and a second force-applying part 43. The head lifting device 11L is used to lift the inkjet head 12. The wiping sliding device slides the wiping unit 32 to a maintenance position and a starting position, wherein the maintenance position refers to a position below the inkjet head 12 after being raised by the head lifting device 11L; the starting position refers to a position different from the maintenance position. According to this structure, when an image is formed, the supply part 41 can be separated from the inkjet head 12 by sliding the wiping unit 32 to the starting position, thereby preventing the sheet from being contaminated or the supply part 41 from being damaged during image formation.

[0109] In addition, according to the inkjet recording device 1 involved in this embodiment, when the wiping unit 32 is located at the maintenance position and the scraper 82 is located at the wiping operation start position, the protruding member 91 and the supply member 41 are pressed by the inkjet head 12 so that the scraper 82 is accommodated in the non-contact space 52U. According to this structure, the time that the scraper 82 and the supply member 41 are in contact at the maintenance position can be reduced.

[0110] In addition, the inkjet recording device 1 according to the present embodiment includes a cleaning liquid supply source 13 and a supply source lifting device 13L, wherein the cleaning liquid supply source 13 is provided above the wiping unit 32 at the starting position and is used to supply the cleaning liquid F to the supply member 41; and the supply source lifting device 13L is used to lift and lower the cleaning liquid supply source 13. When the wiping unit 32 is at the starting position and the scraper 82 is at the wiping action start position, the protruding member 91 and the supply member 41 are pressed by the cleaning liquid supply source 13, and the scraper 82 is accommodated in the non-contact space 52U. According to this structure, the time that the scraper 82 is in contact with the supply member 41 at the starting position can be reduced.

Claims

1. An inkjet recording device, characterized in that The invention comprises a scraper, a protruding member, a retainer, a first force applying member, a supply member and a second force applying member, wherein: The protruding member is integrally provided with the scraper and protrudes toward the inkjet head side; The holder supports the protruding member and the scraper in a manner that allows the protruding member and the scraper to swing around a shaft portion parallel to the nozzle surface of the inkjet head, and tilts the scraper toward the rear side of the traveling direction of a wiping operation in which the scraper slides along the nozzle surface, and holds the protruding member in a posture in which the top end portion of the protruding member is located at a position further to the rear side of the traveling direction than the shaft portion; The first force applying member applies force to the protruding member and the scraper toward the inkjet head side around the shaft; The supply member is disposed at a position further back than the nozzle surface in the traveling direction, and supplies the cleaning liquid to the scraper by contacting with the tip of the scraper; The second biasing member biases the supply member toward the inkjet head. When the protruding member and the supplying member are not pressed from the inkjet head side, the scraper does not come into contact with the supplying member.

2. The inkjet recording device according to claim 1, wherein The supply member has a non-contact space, which is a space where the scraper does not contact the supply member when the scraper is located at the start position of the wiping operation and the protruding member and the supply member are pressed from the inkjet head side.

3. The inkjet recording device according to claim 2, wherein: When the scraper starts the wiping operation in a state where the protruding member and the supply member are pressed from the inkjet head side, the cleaning liquid is supplied to the scraper by the scraper coming into contact with the supply member.

4. The inkjet recording device according to claim 2, wherein: It has a wiping unit, a head lifting device and a wiping sliding device, wherein: The wiping unit includes the scraper, the protruding member, the retainer, the first force applying member, the supply member and the second force applying member; The head lifting device is used to lift the inkjet head; The wiping slide device slides the wiping unit to a maintenance position and a starting position, wherein the maintenance position refers to a lower position of the inkjet head after being raised by the head lifting device; and the starting position is a position different from the maintenance position.

5. The inkjet recording device according to claim 4, characterized in that When the wiping unit is located at the maintenance position and the scraper is located at the start position of the wiping operation, the scraper is accommodated in the non-contact space by the protrusion member and the supply member being pressed by the inkjet head.

6. The inkjet recording device according to claim 5, characterized in that It has a cleaning liquid supply source and a supply source lifting device, wherein: The cleaning liquid supply source is disposed above the wiping unit at the starting position, and is used to supply the cleaning liquid to the supply component; The supply source lifting device is used to lift the cleaning liquid supply source. When the wiping unit is located at the start position and the scraper is located at the start position of the wiping operation, the scraper is accommodated in the non-contact space by the protrusion member and the supply member being pressed by the cleaning liquid supply source.

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