JP2019025740A - Recording head and inkjet recording apparatus including the same - Google Patents

Abstract

To provide a recording head and an inkjet recording apparatus capable of cleaning an ink ejection surface while suppressing breakage of a meniscus of a cleaning liquid.SOLUTION: A recording head includes an ink ejection surface where a plurality of ink ejection ports for ejecting ink onto a sheet are opened. A plurality of cleaning liquid supply ports 60a for supplying a cleaning liquid are disposed on an upstream side with respect to the ink ejection ports in a wiping direction which is a direction in which a wiper wipes the ink ejection surface. A depth H60a of the cleaning liquid supply port 60a is larger than an inner diameter D60a of the cleaning liquid supply port 60a.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a recording head having an ink discharge port for discharging ink onto a recording medium such as paper, and an ink jet recording apparatus including the recording head.

  2. Description of the Related Art As a recording apparatus such as a facsimile, a copying machine, and a printer, an ink jet recording apparatus that forms an image by ejecting ink is widely used because it can form a high-definition image.

  In such an ink jet recording apparatus, a micro ink droplet (hereinafter referred to as a mist) ejected together with an ink droplet for image recording, or a bounce mist generated when the ink droplet adheres to a recording medium, The ink adheres to the ink ejection surface and solidifies. When the mist on the ink ejection surface gradually increases and overlaps the ink ejection port, the straightness of the ink (flying curve), non-ejection, etc. occur and the print performance of the recording head decreases.

  Therefore, in order to clean the ink discharge surface of the recording head, a cleaning liquid supply port is provided outside the ink discharge region (upstream in the wiping direction of the wiper) where a plurality of ink discharge ports of the ink discharge surface open. An ink jet recording apparatus provided with a plurality of ink jets is known. In this ink jet recording apparatus, after supplying the cleaning liquid from the cleaning liquid supply port, the wiper is moved along the ink discharge surface from the outside of the cleaning liquid supply port, so that the ink discharge surface is held while the wiper holds the cleaning liquid. Can be wiped. In this way, the recording head recovery process can be performed.

  An ink jet recording apparatus in which a plurality of cleaning liquid supply ports are provided on the ink discharge surface of the recording head is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-151867.

JP 2007-83396 A

  By the way, in the conventional ink jet recording apparatus, after the recovery process of the recording head, the cleaning liquid meniscus is stretched at the cleaning liquid supply port.

  However, when a vibration or impact is applied to the recording head, there is a problem that the meniscus of the cleaning liquid may be destroyed. When the meniscus is broken, the cleaning liquid is dripped from the cleaning liquid supply port to contaminate the recording medium, or the cleaning liquid flows back into the recording head.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a recording head capable of cleaning the ink ejection surface while suppressing the destruction of the meniscus of the cleaning liquid. And an inkjet recording apparatus including the same.

  In order to achieve the above object, a recording head according to a first aspect of the present invention includes an ink discharge surface in which a plurality of ink discharge ports for discharging ink are opened on a recording medium. A plurality of cleaning liquid supply ports for supplying a cleaning liquid are provided on the upstream side in the wiping direction, which is the direction in which the wiper wipes the ink discharge surface with respect to the ink discharge port. The depth of the cleaning liquid supply port is larger than the inner diameter of the cleaning liquid supply port.

  According to the recording head of the first aspect of the present invention, the plurality of cleaning liquid supply ports for supplying the cleaning liquid are provided upstream of the ink discharge port in the wiping direction. Thus, after supplying the cleaning liquid from the cleaning liquid supply port, the ink discharge surface is held while the cleaning liquid is held by the wiper by moving the wiper along the ink discharge surface from the upstream side in the wiping direction with respect to the cleaning liquid supply port. Can be wiped. For this reason, the ink discharge surface can be cleaned.

  The depth of the cleaning liquid supply port is larger than the inner diameter of the cleaning liquid supply port. Thereby, even when vibration or impact is applied to the recording head, it is possible to suppress the meniscus of the cleaning liquid from being destroyed. For this reason, it is possible to prevent the cleaning liquid from dripping from the cleaning liquid supply port and contaminating the recording medium, or the cleaning liquid from flowing back into the recording head.

The figure which shows the structure of the inkjet recording device provided with the recording head of one Embodiment of this invention. The figure which looked at the 1st conveyance unit and recording part of the ink-jet recording device shown in Drawing 1 from the upper part Diagram of the recording head that constitutes the line head of the recording unit View of the recording head viewed from the ink ejection surface View of the cleaning liquid supply port of the cleaning liquid supply member of the recording head viewed from below Diagram showing the configuration around the print head, sub tank, and main tank The figure which shows the structure of the cleaning liquid supply member of a recording head The figure which shows the structure around the cleaning liquid supply port of the cleaning liquid supply member of a recording head The figure which shows the state which has arrange | positioned the maintenance unit under the recording part FIG. 4 is a diagram illustrating a structure around a cleaning liquid supply port of a cleaning liquid supply member of a recording head, and a diagram illustrating a state in which a liquid surface of the cleaning liquid is formed at the cleaning liquid supply port The figure which shows the state which has arrange | positioned the wiper under the recording head FIG. 4 is a diagram showing a structure around a cleaning liquid supply port of a cleaning liquid supply member of a recording head, and showing a state in which the cleaning liquid is supplied from the cleaning liquid supply port The figure which shows the state which raised the wiper from the state of FIG. 11, and was made to press-contact with the cleaning liquid supply member The figure which shows the state which moved to the arrow A direction in the state which pressed the wiper to the cleaning liquid supply member from the state of FIG. FIG. 5 is a diagram illustrating a structure around a cleaning liquid supply port of a cleaning liquid supply member of a recording head, and a state after a cleaning liquid supply surface is wiped with a wiper The figure which shows the state which moved the wiper further to the arrow A direction from the state of FIG. FIG. 16 is a diagram illustrating a state where the wiper is further moved in the arrow A direction from the state of FIG. 16 and then the wiper is lowered and separated from the ink discharge surface. The figure which shows the structure around the cleaning liquid supply port of the cleaning liquid supply member of the recording head of the 1st modification of this invention. FIG. 9 is a diagram illustrating a structure around a cleaning liquid supply port of a cleaning liquid supply member of a recording head according to a second modification of the present invention. The figure which shows the structure around the cleaning liquid supply port of the cleaning liquid supply member of the recording head of the 3rd modification of this invention. The figure which looked at the ink discharge port and the cleaning liquid supply port of the head part of the recording head of the 4th modification of the present invention from the lower part.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a paper feed tray 2 for storing paper S (recording medium) is provided on the left side of the ink jet recording apparatus 100 according to an embodiment of the present invention. In this case, the accommodated sheets S are conveyed one by one from the uppermost sheet S one by one to a first conveying unit 5 to be described later, and the sheet feeding roller 3 is in pressure contact with the sheet feeding roller 3 and is driven to rotate. A driven roller 4 is provided.

  A first transport unit 5 and a recording unit 9 are disposed on the downstream side (right side in FIG. 1) of the paper feed roller 3 and the driven roller 4 with respect to the paper transport direction (arrow X direction). The first transport unit 5 includes a first drive roller 6, a first driven roller 7, and a first transport belt 6 that is stretched over the first drive roller 6 and the first driven roller 7. When the first drive roller 6 is driven to rotate in the clockwise direction by a control signal from the control unit 110 of the recording apparatus 100, the paper S held on the first transport belt 8 is transported in the arrow X direction.

  The recording unit 9 includes a head housing 10 and line heads 11C, 11M, 11Y, and 11K held by the head housing 10. These line heads 11C to 11K are supported at such a height that a predetermined interval (for example, 1 mm) is formed with respect to the conveying surface of the first conveying belt 8, and as shown in FIG. The recording head 17 is composed of one or more (in this case, one) recording heads 17 extending along the orthogonal sheet width direction (vertical direction in FIG. 2).

  As shown in FIGS. 3 and 4, an ink discharge region R1 in which a large number of ink discharge ports 18a (see FIG. 2) are arranged is formed on the ink discharge surface F1 of the head portion (ink discharge head portion) 18 of the recording head 17. Is provided.

  In the recording heads 17 constituting the line heads 11C to 11K, inks of four colors (cyan, magenta, yellow, and black) stored in ink tanks (not shown) are provided for the respective colors of the line heads 11C to 11K. To be supplied.

  Each recording head 17 is directed to the sheet S conveyed by being held by suction on the conveying surface of the first conveying belt 8 in accordance with image data received from an external computer by a control signal from the control unit 110 (see FIG. 1). Ink is ejected from the ink ejection port 18a. As a result, a color image in which four colors of cyan, magenta, yellow, and black are superimposed is formed on the sheet S on the first conveying belt 8.

  The recording head 17 is provided with a cleaning liquid supply member (cleaning liquid supply head section) 60 for supplying a cleaning liquid. The cleaning liquid supply member 60 is disposed adjacent to the head portion 18 on the upstream side in the wiping direction of the wiper 35 described later (the right side in FIG. 3). The cleaning liquid supply member 60 has a cleaning liquid supply surface F2 including a cleaning liquid supply region R2 in which a large number of cleaning liquid supply ports 60a (see FIG. 5) for supplying a cleaning liquid are arranged. Note that at least the ink discharge surface F1 of the head portion 18 is formed of, for example, SUS (stainless steel), and the cleaning liquid supply member 60 is formed of, for example, resin.

  The cleaning liquid supply surface F2 is formed flush with the ink discharge surface F1. Further, an inclined surface 62 is formed at a portion upstream of the cleaning liquid supply surface F2 of the cleaning liquid supply member 60 in the wiping direction (right side in FIG. 3).

  The cleaning liquid is preferably a solution composed of components similar to the ink, and is a liquid composition mainly composed of water and a solvent component, to which a surfactant, an antiseptic and fungicide are added as necessary.

  As shown in FIG. 6, the cleaning liquid supply port 60 a (see FIG. 5) of the cleaning liquid supply member 60 is connected to the downstream end of the cleaning liquid supply path 70 formed of a tube through which the cleaning liquid 23 passes. The upstream end of the cleaning liquid supply path 70 is connected to a sub tank 71 that stores the cleaning liquid 23 supplied to the cleaning liquid supply member 60. The upstream end of the cleaning liquid supply path 70 is immersed in the cleaning liquid 23. The cleaning liquid supply path 70 is provided with a supply pump 72 that draws the cleaning liquid 23 from the sub tank 71 and sends it to the cleaning liquid supply member 60. In the figure, the cleaning liquid 23 is hatched for easy understanding.

  The subtank 71 is connected to the downstream end of a cleaning liquid supply path 80 made of a tube through which the cleaning liquid 23 passes. The upstream end of the cleaning liquid supply path 80 is connected to a main tank 81 that stores the cleaning liquid 23 to be supplied to the sub tank 71. The upstream end of the cleaning liquid supply path 80 is immersed in the cleaning liquid 23. The cleaning liquid supply path 80 is provided with a supply pump 82 that pumps the cleaning liquid 23 from the main tank 81 and sends it to the sub tank 71. As the supply pump 72 and the replenishment pump 82, for example, a tube pump, a syringe pump, a diaphragm pump, or the like can be used. However, the supply pump 72 is configured to be able to switch between a state where the inlet and the outlet of the supply pump 72 are blocked and a state where the supply pump 72 is in communication with the supply pump 72 when the supply is stopped. The detailed structure around the cleaning liquid supply member 60, the sub tank 71, and the main tank 81 will be described later.

  In the ink jet recording apparatus 100, in order to clean the ink discharge surface F1 of the recording head 17, ink is discharged from the ink discharge ports 18a of all the recording heads 17 at the start of printing after being stopped for a long time and between printing operations. In parallel, the cleaning liquid 23 is supplied from the cleaning liquid supply ports 60a (see FIG. 5) of all the recording heads 17 to the cleaning liquid supply region R2, and the ink discharge surface F1 is moved by the wiper 35 described later. Wipe off and prepare for the next printing operation.

  Returning to FIG. 1, the second transport unit 12 is arranged on the downstream side (right side in FIG. 1) of the first transport unit 5 with respect to the paper transport direction. The second transport unit 12 includes a second drive roller 13, a second driven roller 14, and a second transport belt 15 stretched over the second drive roller 13 and the second driven roller 14. When the two drive rollers 13 are rotationally driven in the clockwise direction, the paper S held on the second transport belt 15 is transported in the arrow X direction.

  The paper S on which the ink image is recorded by the recording unit 9 is sent to the second transport unit 12, and the ink ejected on the surface of the paper S while passing through the second transport unit 12 is dried. A maintenance unit 19 and a cap unit 90 are disposed below the second transport unit 12. When performing the wiping operation by the wiper 35 described above, the first transport unit 5 is lowered, the maintenance unit 19 is moved below the recording unit 9, and is forcibly discharged from the ink discharge port 18 a of the recording head 17. The cleaning liquid 23 supplied from the ink and cleaning liquid supply port 60a is wiped off, and the wiped ink and cleaning liquid 23 are collected. When capping the ink ejection surface F1 (see FIG. 3) of the recording head 17, the first transport unit 5 is lowered, and the cap unit 90 is moved horizontally below the recording unit 9 and further moved upward. Mounted on the lower surface of the recording head 17.

  Further, on the downstream side of the second transport unit 12 with respect to the paper transport direction, a discharge roller pair 16 that discharges the paper S on which an image is recorded to the outside of the apparatus main body is provided. Is provided with a discharge tray (not shown) on which the sheets S discharged outside the apparatus main body are stacked.

  The maintenance unit 19 supports a plurality of wipers 35 (see FIG. 11) that can move along the ink ejection surface F1, a substantially rectangular carriage (not shown) to which the plurality of wipers 35 are fixed, and the carriage. And a support frame (not shown). A carriage (not shown) is supported to be slidable in the direction of arrow AA ′ with respect to a support frame (not shown).

  The wiper 35 is an elastic member (for example, a rubber member made of EPDM) for wiping the cleaning liquid 23 supplied to the cleaning liquid supply surface F2 from the cleaning liquid supply port 60a (see FIG. 5) of each recording head 17. . The wiper 35 is brought into pressure contact with a cleaning liquid supply region R2 (see FIG. 4) of the cleaning liquid supply member 60 on a portion (here, the inclined surface 62) on the upstream side in the wiping direction, and is moved by movement of a carriage (not shown). The cleaning liquid supply surface F2 and the ink discharge surface F1 are wiped in a predetermined direction (arrow A direction).

  Next, the structure around the cleaning liquid supply member 60, the sub tank 71, and the main tank 81 will be described in detail.

  As shown in FIG. 6, a first detection sensor 73 that detects the cleaning liquid 23 is provided at a predetermined position of the sub tank 71. The first detection sensor 73 has an electrode pair (not shown) that is applied with a voltage and is disposed in the sub tank 71. The first detection sensor 73 can detect the presence or absence of the cleaning liquid 23 based on the presence or absence of energization between the electrodes. When the first detection sensor 73 detects the absence of liquid (no power supply), the cleaning liquid 23 is supplied from the main tank 81 to the sub tank 71 by the supply pump 82 until the presence of liquid (energization) is detected. Thereby, the liquid level (upper surface) of the cleaning liquid 23 in the sub tank 71 is maintained at a substantially constant height.

  A second detection sensor 83 that detects the cleaning liquid 23 is provided below the main tank 81. The second detection sensor 83 has an electrode pair (not shown) that is arranged in the main tank 81 while being applied with a voltage. The second detection sensor 83 can detect the presence or absence of the cleaning liquid 23 based on the presence or absence of energization between the electrodes. When the second detection sensor 83 detects the absence of liquid, the display panel (not shown) of the inkjet recording apparatus 100 is notified that the main tank 81 is empty. Thereby, the main tank 81 is replaced with a new one or the main tank 81 is replenished with the cleaning liquid 23 by a user or an operator.

  The sub tank 71 is disposed above the main tank 81 and is disposed below the cleaning liquid supply surface F <b> 2 of the recording head 17. Further, the sub tank 71 is provided with an atmosphere opening port 71a for making the air pressure in the internal space equal to the atmospheric pressure. For this reason, if the connection between the inlet and the outlet of the supply pump 72 is made in a state where the supply pump 72 is turned off, a negative pressure is applied to the cleaning liquid 23 of the cleaning liquid supply port 60a.

  As shown in FIG. 5, the plurality of cleaning liquid supply ports 60a are arranged at predetermined intervals in the wiping direction (arrow A direction) and the head width direction (arrow BB ′ direction, the direction perpendicular to the wiping direction). ing.

  Specifically, the supply port array E1 is configured by arranging a plurality of cleaning liquid supply ports 60a along the head width direction. The supply port row E1 is provided in a plurality of rows (two rows in FIG. 5) along the wiping direction. Further, the supply port array E1 is arranged so as to be shifted by a half pitch in the head width direction with respect to the adjacent supply port array E1. For this reason, the cleaning liquid supply ports 60a are arranged in a staggered manner. The supply port row E1 may be provided in one row or three or more rows. Further, the supply port array E1 may not be arranged to be shifted in the head width direction with respect to the adjacent supply port array E1.

  As shown in FIG. 7, the cleaning liquid supply member 60 includes an upper member 64 and a lower member 65. The upper member 64 and the lower member 65 are made of resin. The upper member 64 and the lower member 65 form a cleaning liquid chamber Q that is filled with the cleaning liquid 23 supplied from the sub tank 71 (see FIG. 6). The cleaning liquid chamber Q is connected to a plurality of cleaning liquid supply ports 60a.

  The upper member 64 constitutes the upper surface and the side surface of the cleaning liquid chamber Q. The upper member 64 is provided with a connection portion 64a to which the downstream end of the cleaning liquid supply path 70 (see FIG. 6) is connected.

  The lower member 65 constitutes a bottom surface and a side surface of the cleaning liquid chamber Q. The lower member 65 constitutes the bottom surface of the cleaning liquid chamber Q and has a bottom surface portion 65a on which the cleaning liquid supply surface F2 is formed, and an inclined portion 65b that is provided continuously with the bottom surface portion 65a and on which the inclined surface 62 is formed. , Including.

  As shown in FIG. 8, the bottom surface portion 65 a has a plurality of cleaning liquid supply ports 60 a and a plurality of recesses that are disposed on the cleaning liquid supply ports 60 a and communicate with the cleaning liquid chamber Q and the cleaning liquid supply ports 60 a. 66 are provided. The recess 66 has an inner diameter larger than the inner diameter of the cleaning liquid supply port 60a.

  The cleaning liquid supply port 60 a is connected to the bottom surface 66 a of the recess 66. Only one recess 66 is provided for one cleaning liquid supply port 60a. The recess 66 and the cleaning liquid supply port 60a are formed in a circular shape in plan view. The cleaning liquid supply port 60 a is formed concentrically with the recess 66.

  The inner surface of the cleaning liquid supply port 60a is provided perpendicular to the cleaning liquid supply surface F2. That is, the cleaning liquid supply port 60a has a constant inner diameter from the lower end to the upper end. The depth H60a of the cleaning liquid supply port 60a is formed larger than the inner diameter D60a of the cleaning liquid supply port 60a. Specifically, the cleaning liquid supply port 60a has a depth H60a of about 0.6 mm, and the cleaning liquid supply port 60a has an inner diameter D60a of about 0.5 mm.

  The recess 66 is formed in an inverted truncated cone shape. The inner diameter D66a of the lower end of the recess 66 (the diameter of the bottom surface 66a of the recess 66) D66a is smaller than the inner diameter D66b of the upper end of the recess 66 and larger than the inner diameter D60a of the cleaning liquid supply port 60a. Specifically, the inner diameter D66a at the lower end of the recess 66 is formed at about 1.0 mm, and the inner diameter D66b at the upper end of the recess 66 is formed at about 2.0 mm.

  Further, the thickness H65a (= H60a + H66) of the bottom surface portion 65a is formed to be about 1.5 mm, and the depth H66 of the concave portion 66 is formed to be about 0.9 mm. For this reason, the depth H60a of the cleaning liquid supply port 60a is smaller than half the thickness H65a of the bottom surface portion 65a and smaller than the depth H66 of the recess 66.

  The upper member 64 and the lower member 65 are integrally formed by injection molding a resin such as polyacetal, polypropylene, or polyethylene using a mold. When the lower member 65 is formed by injection molding, the mold part corresponding to the recess 66 and the mold part corresponding to the cleaning liquid supply port 60a are brought into contact with each other in the vertical direction, so that the recess 66 and the cleaning liquid supply port are brought into contact. 60a is formed on the bottom surface portion 65a.

  Next, the recovery operation of the recording head 17 using the maintenance unit 19 in the inkjet recording apparatus 100 of the present embodiment will be described. The recovery operation of the recording head 17 described below is executed by controlling the operations of the recording head 17, the maintenance unit 19, the supply pump 72, and the like based on a control signal from the control unit 110 (see FIG. 1). The

  When performing the recovery operation of the recording head 17, first, as shown in FIG. 9, the control unit 110 (see FIG. 1) lowers the first transport unit 5 located below the recording unit 9. Then, the control unit 110 horizontally moves the maintenance unit 19 disposed below the second transport unit 12 so as to be disposed between the recording unit 9 and the first transport unit 5. In this state, the wiper 35 (see FIG. 11) of the maintenance unit 19 is disposed below the ink discharge surface F1 and the cleaning liquid supply surface F2 (see FIG. 3) of the recording head 17. At this time, the supply pump 72 is in an off state, and the liquid surface of the cleaning liquid 23 is formed in the cleaning liquid supply port 60a as shown in FIG. That is, the meniscus of the cleaning liquid 23 is formed so as to bend inwardly of the recording head 17 starting from the lower edge of the cleaning liquid supply port 60a.

(Cleaning liquid supply operation)
Prior to the wiping operation (wiping operation described later), the supply pump 72 (see FIG. 6) is driven (turned on) by the control unit 110 (see FIG. 1), and the cleaning liquid 23 is applied to the recording head 17 as shown in FIG. After a predetermined time has elapsed, the supply pump 72 is stopped (turned off), and the inlet and outlet of the supply pump 72 are shut off. At this time, the cleaning liquid 23 is in the state shown in FIG. That is, the cleaning liquid 23 protrudes from the cleaning liquid supply port 60a in a convex shape with the surface tension of the cleaning liquid 23.

(Ink extrusion operation)
Prior to the wiping operation (wiping operation described later), the ink 22 is supplied to the recording head 17 by the control unit 110 (see FIG. 1) as shown in FIG. The supplied ink 22 is forcibly extruded (purged) from the ink discharge port 18a. By this purging operation, thickened ink, foreign matter and bubbles in the ink discharge port 18a are discharged from the ink discharge port 18a. At this time, the purge ink 22 is pushed out to the ink discharge surface F1 along the shape of the ink discharge region R1 where the ink discharge port 18a exists. In the figure, the ink (purge ink) 22 is hatched for easy understanding.

(Wiping operation)
As shown in FIG. 13, the controller 110 raises the wiper 35 to bring the wiper 35 into contact with the inclined surface 62 of the cleaning liquid supply member 60 of the recording head 17 with a predetermined pressure. At this time, the wiper 35 is raised so that the upper surface of the wiper 35 is higher than the ink discharge surface F1 and the cleaning liquid supply surface F2 by about 1 mm. As a result, the amount of biting (overlap amount) of the wiper 35 with respect to the ink discharge surface F1 and the cleaning liquid supply surface F2 becomes about 1 mm. Note that when the wiper 35 is raised, the wiper 35 may not be in pressure contact with the inclined surface 62. That is, the wiper 35 may be raised at a position on the right side of FIG.

  From the state where the tip of the wiper 35 is in pressure contact with the inclined surface 62 of the cleaning liquid supply member 60, the control unit 110 moves the wiper 35 along the cleaning liquid supply surface F2 in the direction of the ink discharge region R1 (arrow A Direction). Accordingly, the wiper 35 scoops the cleaning liquid 23 in a state protruding from the cleaning liquid supply port 60a, and moves in the direction of the ink ejection region R1 while holding the cleaning liquid 23. At this time, the cleaning liquid 23 of the cleaning liquid supply member 60 is in the state shown in FIG.

  When the tip of the wiper 35 passes through the cleaning liquid supply region R2, the inlet and outlet of the supply pump 72 are switched to the communication state. As a result, a negative pressure is applied to the cleaning liquid 23 in the cleaning liquid supply port 60a, and the cleaning liquid 23 is sucked into the cleaning liquid supply port 60a to return to the state shown in FIG.

  Then, as shown in FIG. 16, the wiper 35 moves to the left (in the direction of arrow A) on the ink ejection surface F1 while maintaining the state where the cleaning liquid 23 is held. At this time, the cleaning liquid 23 and the ink (purge ink) 22 dissolve the ink droplets (waste ink) that adhere to the ink ejection surface F1 and solidify, and are wiped off by the wiper 35. The wiper 35 further moves in the left direction (arrow A direction), and stops moving in the left direction when reaching the position opposite to the cleaning liquid supply region R2 with respect to the ink discharge region R1. The cleaning liquid 23 and waste ink wiped off by the wiper 35 are collected in a cleaning liquid collection tray (not shown) provided in the maintenance unit 19.

(Separation operation)
After execution of the wiping operation, as shown in FIG. 17, the control unit 110 lowers the wiper 35 and separates it from the ink ejection surface F1.

  Finally, the control unit 110 horizontally moves the maintenance unit 19 arranged between the recording unit 9 and the first conveyance unit 5 and arranges the maintenance unit 19 below the second conveyance unit 12 to place the first conveyance unit 5 in a predetermined manner. Raise to the position. In this way, the recovery operation of the recording head 17 is completed.

  In the present embodiment, as described above, the plurality of cleaning liquid supply ports 60a for supplying the cleaning liquid 23 are provided on the upstream side in the wiping direction with respect to the ink discharge ports 18a. Thus, after supplying the cleaning liquid 23 from the cleaning liquid supply port 60a, the wiper 35 is moved along the ink discharge surface F1 from the upstream side of the cleaning liquid supply port 60a in the wiping direction. The ink discharge surface F1 can be wiped while holding the ink. For this reason, the ink discharge surface F1 can be cleaned.

  Further, the depth H60a of the cleaning liquid supply port 60a is larger than the inner diameter D60a of the cleaning liquid supply port 60a. Accordingly, even when vibration or impact is applied to the recording head 17, it is possible to suppress the meniscus of the cleaning liquid 23 from being broken. For this reason, it is possible to prevent the cleaning liquid 23 from dripping from the cleaning liquid supply port 60 a and soiling the paper S, or the cleaning liquid 23 from flowing back into the recording head 17. In order to prevent the meniscus of the cleaning liquid 23 from being destroyed, the inner diameter D60a of the cleaning liquid supply port 60a is preferably small. When the inner diameter D60a of the cleaning liquid supply port 60a is constant, the depth H60a of the cleaning liquid supply port 60a is preferably large.

  Further, as described above, the bottom surface portion 65a includes a plurality of cleaning liquid supply ports 60a and a recess 66 that is disposed on the cleaning liquid supply port 60a and has an inner diameter larger than the inner diameter of the cleaning liquid supply port 60a. Is provided. Thereby, since the depth H60a of the cleaning liquid supply port 60a can be reduced, the inner diameter D60a of the cleaning liquid supply port 60a can be easily formed small. Further, the thickness H65a of the bottom surface portion 65a can be easily ensured.

  Further, as described above, the recess 66 is formed in an inverted truncated cone shape. Thereby, when forming the recessed part 66 in the bottom face part 65a by carrying out injection molding of resin using a metal mold | die, the mold release property from a metal mold | die can be improved.

  Further, as described above, the inner diameter D66a of the lower end of the recess 66 is larger than the inner diameter D60a of the cleaning liquid supply port 60a. As a result, even when the cleaning liquid supply port 60a is formed to be displaced with respect to the recess 66, the upper end of the cleaning liquid supply port 60a protrudes outward from the lower end edge (bottom surface 66a) of the recess 66. Can be easily suppressed.

  Further, as described above, the depth H60a of the cleaning liquid supply port 60a is smaller than half of the thickness H65a of the bottom surface portion 65a. Accordingly, the depth H60a of the cleaning liquid supply port 60a can be reduced while the thickness H65a of the bottom surface portion 65a is secured, and the inner diameter D60a of the cleaning liquid supply port 60a can be easily made sufficiently small.

  Further, as described above, the bottom surface portion 65a is formed of resin. Thus, the cleaning liquid supply port 60a and the recess 66 can be easily formed in the bottom surface portion 65a by injection molding the resin using a mold.

  Further, as described above, the plurality of cleaning liquid supply ports 60a are provided in the cleaning liquid supply region R2 disposed upstream in the wiping direction with respect to the ink discharge region R1 in which the plurality of ink discharge ports 18a are opened. ing. Thereby, since the ink passage and the cleaning liquid passage in the recording head 17 can be formed separately (separated), it is possible to prevent the structure of the recording head 17 from becoming complicated.

  Further, as described above, the recording head 17 includes the head portion 18 in which the plurality of ink discharge ports 18a are formed and the cleaning liquid supply member 60 in which the plurality of cleaning liquid supply ports 60a are formed. . Thereby, the cleaning liquid supply port 60a can be easily formed as compared with the case where the cleaning liquid supply port 60a is formed in the head portion 18.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, the example in which the cleaning liquid supply port 60a and the recess 66 are provided in the bottom surface portion 65a has been described, but the present invention is not limited thereto. For example, like the cleaning liquid supply member 60 of the recording head 17 of the first modification of the present invention shown in FIG. 18, the bottom surface portion 65a may be provided with only the cleaning liquid supply port 60a without providing the recess 66. In this case, the lower member 65 may be formed of a metal such as SUS. The cleaning liquid supply port 60a may be formed by drilling or laser processing the metal plate.

  Moreover, in the said embodiment, although the example which forms the recessed part 66 in a reverse truncated cone shape was shown, this invention is not limited to this. For example, like the cleaning liquid supply member 60 of the recording head 17 of the second modification of the present invention shown in FIG. 19, the recess 66 may be formed in a columnar shape, for example. That is, the inner surface of the recess 66 may be formed perpendicular to the cleaning liquid supply surface F2.

  In the above embodiment, the example in which the inner diameter D66a at the lower end of the recess 66 is formed larger than the inner diameter D60a of the cleaning liquid supply port 60a has been described, but the present invention is not limited to this. For example, like the cleaning liquid supply member 60 of the recording head 17 of the third modification of the present invention shown in FIG. 20, the inner diameter of the lower end of the recess 66 may be formed to be the same as the inner diameter of the cleaning liquid supply port 60a. Good. However, when the cleaning liquid supply port 60a is formed so as to be displaced with respect to the recess 66, the upper end of the cleaning liquid supply port 60a protrudes outward from the lower end of the recess 66. It is preferable to form it larger than the inner diameter of the opening 60a.

  In the above embodiment, the cleaning liquid supply member 60 in which the cleaning liquid supply port 60a is formed is provided separately from the head unit 18, but the present invention is not limited to this. The cleaning liquid supply member 60 may be provided in the head portion 18 without providing the cleaning liquid supply member 60. At this time, as in the recording head 17 according to the fourth modified example of the present invention shown in FIG. 21, for example, the cleaning liquid supply port 60a is adjacent to the ink discharge port 18a (for example, the ink discharge port 18a and the supply port array E1). May be arranged alternately in the direction of arrow AA ′.

  In the above embodiment, the cleaning liquid supply port 60a and the recess 66 are shown as being circular in plan view, but the present invention is not limited to this. The cleaning liquid supply port 60a and the recess 66 may be formed in a rectangular shape or a polygonal shape in a plan view. In the present specification and claims, a circular shape is a concept including not only a perfect circular shape but also an elliptical shape and an oval shape. In the present specification and claims, the inner diameter is the maximum length between the side surfaces facing each other in the opening, and means, for example, the diameter in a perfect circle shape, the major diameter in an elliptical shape and an elliptical shape.

  In the above embodiment, an example in which the recovery operation of the recording head 17 is performed using the cleaning liquid 23 and the ink (purge ink) 22 has been described. However, the recovery operation of the recording head 17 is performed using only the cleaning liquid 23. Also good. That is, it is not necessary to perform the ink pushing operation.

  Further, a configuration obtained by appropriately combining the configurations of the above-described embodiment and modification examples is also included in the technical scope of the present invention.

17 Recording Head 18 Head (Ink Ejection Head)
18a Ink discharge port 22 Ink 23 Cleaning liquid 35 Wiper 60 Cleaning liquid supply member (cleaning liquid supply head)
60a Cleaning liquid supply port 65a Bottom surface part 66 Recessed part 100 Inkjet recording device D60a, D66a, D66b Inner diameter F1 Ink discharge surface F2 Cleaning liquid supply surface H60a Depth H65a Thickness Q Cleaning liquid chamber R1 Ink discharge region R2 Cleaning liquid supply region S Paper ( recoding media)

Claims (9)

A recording head having an ink ejection surface in which a plurality of ink ejection openings for ejecting ink on a recording medium are opened,
A plurality of cleaning liquid supply ports for supplying a cleaning liquid are provided on the upstream side of the wiping direction, which is the direction in which the wiper wipes the ink discharge surface with respect to the ink discharge port.
The recording head according to claim 1, wherein a depth of the cleaning liquid supply port is larger than an inner diameter of the cleaning liquid supply port. A cleaning liquid chamber connected to the plurality of cleaning liquid supply ports and filled with the cleaning liquid;
A bottom surface portion constituting the bottom surface of the cleaning liquid chamber;
With
In the bottom part,
The plurality of cleaning liquid supply ports;
A plurality of recesses disposed on each cleaning liquid supply port, communicating the cleaning liquid chamber and each cleaning liquid supply port, and having an inner diameter larger than an inner diameter of the cleaning liquid supply port;
The recording head according to claim 1, wherein the recording head is provided.   The recording head according to claim 2, wherein the concave portion is formed in an inverted truncated cone shape.   The recording head according to claim 2, wherein an inner diameter of a lower end of the recess is larger than an inner diameter of the cleaning liquid supply port.   The recording head according to claim 2, wherein a depth of the cleaning liquid supply port is smaller than half of a thickness of the bottom surface portion.   The recording head according to claim 2, wherein the bottom surface portion is formed of a resin. The ink discharge surface includes an ink discharge region in which the plurality of ink discharge ports are opened,
7. The cleaning liquid supply port according to claim 1, wherein the plurality of cleaning liquid supply ports are provided in a cleaning liquid supply area disposed upstream of the ink discharge area in the wiping direction. The recording head according to the item.   The recording head includes an ink discharge head portion having the ink discharge surface and a cleaning liquid supply head portion having a cleaning liquid supply surface provided with the cleaning liquid supply region. Item 8. The recording head according to Item 7. The recording head according to any one of claims 1 to 8,
A wiper for wiping the ink ejection surface of the recording head;
An ink jet recording apparatus comprising:

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