JP2007260949A - Liquid supplying device and liquid jetting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid supplying device and a liquid jetting apparatus which can supply liquid supplied from the upstream side to the liquid jetting head of the downstream side while removing a foreign substance, and also which can discharge the foreign substance to the outside of the liquid jetting head by the reverse cleaning of the liquid jetting head if the foreign substance is present in a liquid supplying passage within the liquid jetting head. <P>SOLUTION: In the valve unit 22 in which the liquid supplying passage capable of supplying ink supplied from the upstream side to a recording head 13 connected to the downstream side is formed, a liquid inlet 54 and a liquid outlet 84 are formed through which the ink is flown from the upstream side into the liquid supplying passage, and through which the ink is made to flow out of the liquid supplying passage toward the recording head 13 of the downstream side. At least an outside filter member 85 among an inlet side filter member 74 which can trap the foreign substance in the ink that flows in from the upstream side via the liquid inlet 54, and the outlet side filter member 85 which can trap the foreign substance in the ink that flows out via the liquid outlet 84 to the downstream side is set in the liquid supplying passage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid supply apparatus and a liquid ejection apparatus.

  2. Description of the Related Art Inkjet printers (hereinafter referred to as “printers”) are widely known as liquid ejecting apparatuses that eject liquid onto a target. In this printer, a recording head (liquid ejecting head) is mounted on a reciprocating carriage, and ink (liquid) is supplied to the recording head from an ink cartridge (liquid container) mounted at a predetermined position of the printer. Printing is performed by ejecting ink onto a recording medium as a target from nozzles formed on the nozzle formation surface of the recording head.

  Therefore, in such a printer, a valve unit (liquid supply device) having a liquid supply path for supplying ink from the ink cartridge to the recording head is provided on the carriage, and ink is placed in the middle of the liquid supply path in the valve unit. A pressure chamber (liquid storage part) that can be temporarily stored is provided (see, for example, Patent Document 1). In this valve unit, a filter member is interposed in the middle of the liquid supply path on the ink cartridge side (upstream side) from the pressure chamber. That is, even if foreign matter is included in the ink flowing into the pressure chamber from the ink cartridge side, the filter member prevents the foreign matter from flowing into the pressure chamber.

Also, the ink that flows out from the pressure chamber of the valve unit and is supplied to the recording head is ejected from the nozzle of the recording head toward the recording medium, and can be captured by the filter member of the valve unit at that time. If fine foreign matters that have not flown into the nozzle together with the ink, the inside of the nozzle is clogged, resulting in printing defects such as missing dots. Therefore, the recording head in such a printer is supplied with ink supplied from the valve unit side by a finer filter member than the filter member of the valve unit in order to suppress the inflow of fine foreign matter into the recording head. It is thermally welded to the ink introduction port that flows into the inside (see, for example, Patent Document 2).
JP 200595861 A JP 2005-199555 A

  By the way, in the manufacturing stage of the recording head, the dust is reduced as much as possible, but in rare cases, the recording head is manufactured with foreign matter entering the liquid supply path from the ink introduction port to the nozzle. It can happen. If such foreign matter is present in the liquid supply path in the recording head, the foreign matter will flow into the fine nozzle together with the ink flowing from the ink inlet to the nozzle side, thereby clogging the nozzle. Therefore, in order to remove such foreign matter, a method of sucking the liquid supply path in the recording head from the ink introduction port side and causing the ink in the liquid supply path to flow backward from the nozzle side to the ink introduction port side ( So-called reverse cleaning) can be considered.

  However, since a filter member is thermally welded to the ink introduction port of the recording head in order to suppress the inflow of foreign matter from the outside of the recording head, even if the inside of the liquid supply path of the recording head is back-washed, the liquid The foreign matter present in the supply path is restricted by the filter member from being discharged out of the recording head, and the problem of nozzle clogging cannot be solved. On the other hand, when the ink inlet is not provided with a filter member, fine foreign matters that could not be captured by the filter member of the valve unit when the liquid is supplied from the upstream side are directly transferred from the ink inlet to the liquid in the recording head. As a result of allowing the flow into the supply path, the problem of nozzle clogging due to foreign matters cannot be solved.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to be able to supply the liquid supplied from the upstream side to the liquid jet head on the downstream side while removing foreign matters, and if there is a foreign substance in the liquid supply path in the liquid jet head. In this case, it is an object of the present invention to provide a liquid supply apparatus and a liquid ejecting apparatus that can discharge the foreign matters to the outside of the liquid ejecting head by back cleaning of the liquid ejecting head.

  In order to achieve the above object, a liquid supply apparatus according to the present invention includes a liquid supply apparatus in which a liquid supply path capable of supplying a liquid supplied from an upstream side to a liquid jet head connected to the downstream side is formed. A liquid inlet for allowing liquid to flow into the liquid supply path from the upstream side, and a liquid outlet for discharging liquid from the liquid supply path toward the liquid jet head on the downstream side are formed, and the liquid supply path includes An inlet-side filter member capable of catching foreign matters in the liquid flowing from the upstream side through the liquid inlet, and an outlet-side filter member capable of catching foreign matters in the liquid which is going to flow downstream through the liquid outlet Among them, at least an outlet side filter member was attached.

  According to this configuration, the foreign matter in the liquid supplied toward the downstream liquid jet head via the liquid supply path is removed by at least the outlet side filter member mounted in the liquid supply path in the liquid supply apparatus. . Therefore, the liquid supplied from the upstream side can be supplied to the downstream liquid jet head while removing foreign matters. In addition, if a foreign substance exists in the liquid supply path in the liquid ejecting head, the foreign object can be discharged out of the liquid ejecting head by reverse cleaning of the liquid ejecting head.

In the liquid supply apparatus of the present invention, both the inlet side filter member and the outlet side filter member are mounted in the liquid supply path.
According to this configuration, since the foreign matter in the liquid flowing into the liquid supply path of the liquid supply apparatus can be removed by the inlet side filter member, the inside of the liquid supply apparatus can be made a clean liquid supply environment.

In the liquid supply apparatus of the present invention, the outlet side filter member has a filter function capable of capturing finer foreign matter than the foreign matter that can be captured by the inlet side filter member.
According to this configuration, even if foreign matter that could not be captured by the inlet side filter member tries to flow out from the liquid outlet to the downstream side, such foreign matter can be captured by the outlet side filter member. A clean liquid from which foreign substances are removed can be supplied to the liquid ejecting head.

  In the liquid supply apparatus according to the aspect of the invention, the outlet-side filter member has a filter function that can capture a foreign substance smaller than the opening diameter of a liquid ejecting nozzle formed in the liquid ejecting head.

  According to this configuration, when the liquid supplied downstream via the liquid supply path of the liquid supply device reaches the nozzle of the liquid ejecting head, the upstream end of the nozzle is blocked by the foreign matter contained in the liquid. It is possible to suppress the occurrence of harmful effects such as peeling.

  In the liquid supply apparatus of the present invention, a liquid storage unit capable of temporarily storing the liquid between the mounting position of the inlet side filter member and the mounting position of the outlet side filter member in the middle of the liquid supply path Is formed so as to communicate with the liquid inlet side through the inflow port and with the liquid outlet side through the outflow port, and the liquid flowing to the downstream side through the outflow port is formed in the inflow port. There is provided an on-off valve that is displaced between a valve closing position for closing the inlet and a valve opening position for opening the inlet based on pressure fluctuations in the liquid reservoir accompanying the outflow of the liquid.

  According to this configuration, even if foreign matter is contained in the liquid flowing into the liquid supply path of the liquid supply device, such foreign matter is removed by the inlet-side filter member. It is possible to reduce the possibility that the on-off valve that is arranged at the inlet and adjusts the inflow state of the liquid into the liquid storage part bites in the foreign matter. Therefore, since the sealing function of the on-off valve is not impaired, it is possible to suppress unstable pressure fluctuations in the liquid reservoir.

  The liquid supply device of the present invention is formed by laminating a plurality of flow path forming bodies so as to form a part of the liquid supply path between them, and between the flow path forming bodies adjacent to each other in the laminated state. The filter member is disposed on the surface.

  According to this configuration, the filter member is mounted at a predetermined position in one flow path formation body before the other flow path formation body is superimposed on one flow path formation body of both flow path formation bodies adjacent in the stacking direction. It will be possible to put it on. Therefore, the installation work of the filter member becomes very simple.

  On the other hand, the liquid ejecting apparatus of the present invention includes a liquid container that contains a liquid, a liquid ejecting head that can eject liquid, and the liquid ejecting head interposed between the liquid ejecting head and the liquid container. And a liquid supply device that supplies liquid to the liquid ejecting head side, and the liquid supply device is configured by the liquid supply device having the above configuration.

  According to this configuration, the liquid from the liquid supply device can supply the liquid ejected head with the liquid from which the foreign matter has been removed, and if there is a foreign matter in the liquid supply path in the liquid ejecting head, Since the foreign matter can be discharged out of the liquid jet head by reverse cleaning of the liquid jet head, a good jet state can be obtained.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, an ink jet printer (hereinafter referred to as “printer”) 10 as a liquid ejecting apparatus according to the present embodiment includes a main body case 11 having a rectangular shape in plan view. A rod-shaped guide shaft 12 is installed in the main body case 11 along the left-right direction which is the longitudinal direction of the main body case 11, and a carriage 14 on which a recording head 13 as a liquid ejecting head is mounted is a guide shaft. It is supported so that it can reciprocate along the longitudinal direction of 12.

  In addition, a cartridge holder 15 is provided at a position outside the movement range of the carriage 14 in the main body case 11 (right end side position in FIG. 1), and a plurality (four in this embodiment) are provided on the cartridge holder 15. An ink cartridge 16 as a liquid container is detachably mounted. In this respect, the printer 10 of the present embodiment is not a so-called on-carriage type printer in which the ink cartridge 16 is mounted on the carriage 14 and moves together with the carriage 14, and the ink cartridge 16 is fixed at a different location from the carriage 14. It is configured as a so-called off-carriage type printer that is arranged and does not move with the carriage 14. Note that as many ink cartridges 16 as the number of ink colors (for example, black, yellow, magenta, and cyan) used in the printer 10 (four in this embodiment) are mounted on the cartridge holder 15. Yes.

  A driving pulley 17 and a driven pulley 18 are rotatably supported at positions corresponding to both ends of the guide shaft 12 on the inner surface of the rear side wall (upper side wall in FIG. 1) of the main body case 11. An endless timing belt 19 is mounted between the drive pulley 17 and the driven pulley 18, and an output shaft (not shown) of the carriage motor 20 fixed to the outer surface of the rear side wall of the main body case 11 is attached to the drive pulley 17. It is connected. Therefore, the carriage 14 reciprocates in the main scanning direction (left and right direction in FIG. 1) along the guide shaft 12 based on the driving force of the carriage motor 20 transmitted via the timing belt 19.

  A platen 21 is provided in the main body case 11 below the guide shaft 12 so as to extend in the left-right direction. The platen 21 is a support base for supporting a sheet (not shown) as a target, and feeds the sheet toward the front, which is the lower side in FIG. 1, with the rotation of a sheet feed motor (not shown). Yes.

  On the carriage 14, a valve unit 22 is mounted as a liquid supply device that supplies ink (liquid) supplied from each ink cartridge 16 side to the recording head 13 side. A plurality (four in this embodiment) of ink supply tubes 23 individually corresponding to each ink cartridge 16 are connected to the valve unit 22 so that ink can be supplied from each ink cartridge 16 individually. The valve unit 22 temporarily stores the ink taken from the ink cartridge 16 via the ink supply tubes 23, adjusts the stored ink to a predetermined pressure, and adjusts the nozzle row 13A on the recording head 13 side (see FIG. 20)). Each ink supply tube 23 constitutes a part of a liquid supply path for supplying ink from each ink cartridge 16 to the recording head 13.

  A pressurizing unit 24 is mounted at a position above the cartridge holder 15 in the main body case 11. The pressurizing unit 24 is a device that sends out pressurized air (pressurized gas) to the ink cartridge 16 through the air supply tube 25, and includes a pressurizing pump 26, a pressure sensor 27, and an air release valve 28. The air supply tube 25 is branched into a plurality of tubes (four in this embodiment) by a distributor 29 arranged on the downstream side of the atmosphere release valve 28, and each branched tube is connected to each ink cartridge 16 one by one. Yes.

  As shown in FIGS. 1 and 2, each ink cartridge 16 has a rectangular box-shaped ink case 30, and an ink pack 31 in which ink is sealed is stored in the ink case 30. An ink supply connection port 32 is formed in a substantially intermediate position in the vertical direction on one side wall (right side wall in FIG. 2) of the ink case 30, and the ink supply connection port 32 is integrally formed with the ink pack 31. A cylindrical ink discharge port 31 a is fitted so that its tip is exposed to the outside of the ink case 30. An ink supply tube 23 extending toward the valve unit 22 is connected to the ink discharge port 31a.

  In addition, an air supply connection port 33 is formed through one side wall (right side wall in FIG. 2) of the ink case 30 at a position below the ink supply connection port 32. A cylindrical connection pipe 34 is fitted into the air supply connection port 33 so that one end (the right end in FIG. 2) is exposed to the outside of the ink case 30 and the other end faces the ink case 30. Are combined. Then, the end of the air supply tube 25 extending from the pressure pump 26 described above is connected to one end of the connection pipe 34 exposed to the outside of the ink case 30, whereby the ink case 30 is contained in the ink case 30. An air chamber 35 in an airtight state is formed between the inner surface of the ink pack 31 and the outer surface of the ink pack 31.

  When the pressurized air is introduced into the air chamber 35 of the ink case 30 in the ink cartridge 16 through the air supply tube 25 as the pressure pump 26 is driven, the air pressure (pressure force) of the pressurized air ), The ink pack 31 is crushed. Then, the ink in the ink pack 31 is supplied to the valve unit 22 via the ink supply tube 23 by being crushed in this way.

Next, the valve unit 22 will be described.
As shown in FIG. 3, the valve unit 22 includes a pressure chamber part 36, a first flow path part 37, and a second flow path part 38, each of which is formed into a thin plate shape and has a regularity. And a protective plate 39 having a substantially rectangular plate shape. The valve unit 22 is laminated so as to be a second flow path component 38, a first flow path component 37, and a pressure chamber component 36 sequentially from the bottom to the top, and is further protected on the pressure chamber component 36. The plates 39 are superposed on each other by being overlapped. Hereinafter, specific configurations of the protection plate 39, the pressure chamber component 36, the first flow path component 37, and the second flow path component 38 will be described in this order. In the following description of each component such as the protective plate 39 and the pressure chamber part 36, the upper surface in the laminated state is referred to as the front surface and the lower surface is referred to as the back surface as shown in FIG. Shall be called.

First, a specific configuration of the protection plate 39 will be described.
As shown in FIGS. 4 to 6, the protective plate 39 is a resin plate material in which a rectangular cutout 40 is formed on one long side, and screw holes are formed on the front end surface from four locations on the back side. A columnar part 41 having a hole 41a is formed to protrude. As shown in FIGS. 5 and 6, a plurality (four in this embodiment) of groove-shaped recesses 42 are arranged in parallel on the back surface side of the protective plate 39 so as to be parallel to each other in the same shape. A small-diameter through hole 43 is formed one by one on the inner bottom surface on one end side of each groove-like recess 42.

  Further, a sealing film 44 as a single film member is thermally welded to the back surface side of the protective plate 39 so as to cover each groove-like recess 42. This sealing film 44 is a thin film having flexibility, and as shown in FIG. 6, from the beginning to the inward side of the groove-shaped recess 42 corresponding to each groove-shaped recess 42. It is pressure-molded so as to be slightly bent into a dome shape and attached to the protective plate 39. An air chamber 45 is defined between the sealing film 44 thus attached and each groove-like recess 42. The sealing film 44 has alignment holes 46 formed at two locations corresponding to the columnar portions 41 of the protective plate 39, and when the sealing film 44 is attached to the back side of the protective plate 39, The alignment hole 46 functions as an alignment means, and the corresponding columnar portion 41 is inserted and guided so that the sealing film 44 is attached to an appropriate position corresponding to each groove-shaped recess 42.

  On the other hand, as shown in FIG. 4, a series of groove portions 47 communicating with the respective through holes 43 are formed on the front surface side of the protection plate 39 so as to meander, and the back surface of the protection plate 39 is formed in the groove portion 47. A small-diameter atmosphere communication hole 48 is formed through the outer side of each groove-like recess 42 formed on the side. On the surface side of the protective plate 39, a single barrier film 49 having a high gas barrier property is thermally welded so as to cover each of the through holes 43, the series of groove portions 47, and the air communication holes 48 described above. . As the barrier film 49, for example, a film made of polyethylene, polypropylene, polyester, polyamide or the like on which aluminum or silica is deposited is used.

  Also, pilot holes 39a functioning as alignment means are formed through the protective plate 39 in the vicinity of the corners on one short side (the short side on the right diagonal side in FIG. 3 and FIG. 4). Of the pilot holes 39a, one main pilot hole 39a close to the notch 40 side has a round hole shape, and the other sub pilot hole 39a has an oval shape.

Next, a specific configuration of the pressure chamber part 36 will be described.
As shown in FIGS. 7 to 9, the pressure chamber component 36 is a resin plate having a rectangular shape in plan view, and a plurality of individually corresponding groove-shaped recesses 42 formed on the protective plate 39 on the surface side thereof. (In this embodiment, four) groove-like flow paths (part of the liquid supply path) 50 are arranged in parallel so as to form the same form and to be parallel to the longitudinal direction. When the protective plate 39 is bonded on the pressure chamber component 36 in the stacking direction, the groove-like flow channel 50 is sealed at the upper opening 50a by the sealing film 44 seeded on the back side of the protective plate 39. As a result, a pressure chamber 50 </ b> A (see FIG. 22) is formed between the sealing film 44 and the sealing film 44.

  A small-diameter inlet 51 is formed through the inner bottom surface on one end side (the upper end side in FIGS. 8 and 9) of each groove-like channel 50, and the other end side of each groove-like channel 50 ( Similarly, small-diameter outlets 52 are formed through the inner bottom surface at the lower end side in FIGS. Further, in the vicinity of one long side on the surface side of the pressure chamber component 36, when the pressure chamber component 36 and the protection plate 39 are joined in the stacking direction, the notch 40 of the protection plate 39 is fitted for alignment. A rectangular pedestal 53 to be joined is raised. The pedestal 53 is formed with a plurality of (four in this embodiment) liquid inlets 54 to which the downstream ends of the respective ink supply tubes 23 are connected.

  Further, at both corners on one end side in the longitudinal direction of the pressure chamber component 36, two columnar portions of the four columnar portions 41 of the protective plate 39 when the pressure chamber component 36 and the protective plate 39 are joined in the stacking direction. Cutout portions 55 through which 41 are inserted are formed in the respective cutouts. In addition, a pair of positioning is provided between the one end side edge in the longitudinal direction of the pressure chamber part 36 and each groove-like channel 50 on the surface of the pressure chamber part 36 with a certain interval in the short direction of the pressure chamber part 36. A pin portion 56 is formed to protrude upward.

  On the other hand, when the pressure chamber part 36 and the protection plate 39 are joined in the stacking direction between the other end side edge in the longitudinal direction of the pressure chamber part 36 and each groove-like channel 50, the remaining two of the protection plate 39 are joined. Two insertion holes 57 through which the columnar portion 41 is inserted are formed as a positioning means. Further, in the vicinity of each insertion hole 57 (near the outer side in the short direction of the pressure chamber component 36), the pressure chamber component 36 and the protection plate 39 are arranged in the stacking direction at a position corresponding to each pilot hole 39a on the protection plate 39 side. Each pilot hole 58 (positioning means) that is to be aligned when they are joined is formed through.

  Further, as shown in FIGS. 7 and 8, when the protective plate 39 is laminated in the vicinity of the insertion hole 57 through which the columnar portion 41 of the protective plate 39 is inserted on the surface of the pressure chamber part 36, the protective plate An atmospheric communication hole 59 is formed so as to be aligned with one of the two atmospheric communication holes 48 on the 39 side (the diagonally right front side in FIG. 4).

  Further, as shown in FIG. 7, an adhesive application part 36 a is provided on the surface of the pressure chamber part 36 so as to follow each outer circumferential edge of each groove-like flow path 50, each insertion hole 57, and each pilot hole 58. ing. This adhesive application part 36a is an area to which an adhesive used when the pressure chamber part 36 and the protective plate 39 are joined in the stacking direction is applied. When the protective plate 39 is joined, on the protective plate 39 side, a portion of the sealing film 44 corresponding to the adhesive application portion 36a on the pressure chamber component 36 side becomes a bonded region.

  As shown in FIGS. 7 and 8, on the surface side of the pressure chamber part 36, a plurality of (four in the present embodiment) elastic pieces 60 constituting the operating lever correspond to the respective groove-like flow paths 50. Thus, a single elastic plate member (elastic member) 62 branched from the substrate portion 61 in a comb shape is mounted. A pair of caulking holes 63 are formed in the base plate portion 61 of the elastic plate member 62, and each of the caulking holes 63 is inserted and caulked in a state of being aligned with the positioning pin portion 56 of the pressure chamber part 36, whereby the elastic plate member 62. Each elastic piece (operating lever) 60 is assembled to the pressure chamber component 36 in a mounting manner in which the elastic pieces (actuating levers) 60 are cantilevered at the upper positions in the corresponding groove-like flow paths 50.

  On the other hand, as shown in FIG. 9, a plurality of (four in this embodiment) valve accommodating recesses 64 are provided at the positions corresponding to the respective inlets 51 on the back surface side of the pressure chamber part 36. It is recessed so as to be located at the center. Similarly, on the back surface side of the pressure chamber part 36, two recesses 66, 67 each having a funnel shape between one end side edge in the longitudinal direction of the pressure chamber part 36 and each valve accommodating recess 64 (each inlet 51). Are formed, and two recesses 68 and 69 having a funnel shape are also formed between each valve housing recess 64 and each outlet 52. In addition, each recessed part 66-69 has comprised the mutually same form.

  As shown in FIG. 9, ink is directly applied to the two concave portions 66 and 68 close to the liquid inlet 54 side among the concave portions 66 to 69 from the second and fourth liquid inlets 54 from the top in FIG. 9. An ink flow path (a part of the liquid supply path) 65a is formed so as to be able to be introduced. The remaining two concave portions 67 and 69 are provided with ink flow paths (part of the liquid supply path) 65b extending to the predetermined positions on the back surface of the pressure chamber part 36, respectively. Further, at positions corresponding to the respective outlets 52, the respective inks that have flowed out from the inside of the groove-like channel 50 on the front surface side to the back side through the respective outlets 52 are separated from the respective outlets 52 in four different directions. An ink flow path (a part of the liquid supply path) 65c leading to the offset position is formed.

  On the back surface of the pressure chamber component 36, an adherend region 36 b is provided along each liquid inlet 54, each valve housing recess 64, each ink flow path 65 a, 65 b, and each outer peripheral edge of each recess 66-69. It has been. The bonded region 36b is a region to which the adhesive applied to the first flow channel component 37 is bonded when the pressure chamber component 36 and the first flow channel component 37 are joined in the stacking direction.

  As shown in FIG. 9, nut mounting portions 36 c into which hexagon nuts (not shown) can be fitted are formed outside the adherend region 36 b and in the vicinity of the notches 55 in the pressure chamber part 36. Yes. Similarly, on the outer side of the bonded region 36b, a hexagon nut (not shown) is also provided at the other end side in the longitudinal direction (the lower end side in FIG. 9) in the longitudinal direction than the insertion holes 57 in the pressure chamber part 36. A nut mounting portion 36c into which (not shown) can be fitted is formed.

Next, a specific configuration of the first flow path component 37 will be described.
As shown in FIG. 10, the first flow path component 37 is a resin plate material having a rectangular shape in plan view, and the outer shape when projected in the stacking direction is substantially the same as the pressure chamber component 36. Is formed. That is, in the first flow path component 37, the pressure chamber component 36 is formed with notches 55 at both corners on one end in the longitudinal direction, whereas such a notch is on one end in the longitudinal direction. The pressure chamber part 36 is different from the pressure chamber part 36 only in that it is not formed at both corners.

  FIG. 10 is a perspective view of the first flow path component 37 as seen from above obliquely. As shown in FIG. 10, the pressure chamber component that faces the surface of the first flow path component 37 is stacked. Each flow path, each recessed part, each hole, etc. are arrange | positioned so that it may have a mirror surface relationship with the back surface of 36. That is, a plurality (four in this embodiment) of recesses 70 to 73 having the same form as those are formed at positions facing the recesses 66 to 69 on the pressure chamber part 36 side when stacked. Incidentally, when the pressure chamber part 36 and the first flow path part 37 are joined in the stacking direction, the respective recesses 66 and 70, the recesses 67 and 71, the recesses 68 and 72, and the recesses are provided. 69 and the recessed part 73 will be in the state mutually joined in agreement.

  A circular inlet-side filter member 74 made of a metal mesh is thermally welded to the large diameter portion in each of the recesses 70 to 73 in the first flow path component 37. These filter members 74 have a function of capturing foreign matter by filtering the ink when foreign matter is contained in the ink flowing into the valve unit 22 from the liquid inlet 54. In the case of the form, the coarseness of the eyes is set to about 29 microns so that foreign matters larger than 30 microns can be captured.

  Further, as shown in FIG. 10, in the surface of the first flow path component 37, in the position corresponding to the four liquid inlets 54 formed on the pressure chamber component 36 side, the pressure chamber component 36 is shown in FIG. An ink passage 75 is formed so as to penetrate the first and third liquid inlets 54 from the top when they are joined. Then, from the position corresponding to the remaining second and fourth liquid inlets 54, the ink flow path (a part of the liquid supply path) 76 a extending toward the two concave portions 70 and 72 described above is the pressure chamber part 36. Are formed so as to have a mirror relationship with each of the ink flow paths 65a formed so as to connect the corresponding liquid inlets 54 and the recesses 66 and 68 respectively.

  In addition, at the position facing the respective ink flow paths 65b extending from the two recesses 67 and 69 on the pressure chamber part 36 side on the surface of the first flow path part 37, the ink flow paths having the same form as those are provided. (Part of the liquid supply path) 76b has a mirror surface relationship with the corresponding ink flow path 65b and is formed so as to extend from the recesses 71 and 73 described above to the predetermined position on the surface of the first flow path component 37. Has been. A through hole 77 is formed in the inner bottom surface of these ink flow paths 76b at a position corresponding to the extended end of the corresponding ink flow path 65b. Each through hole 77 is connected to each ink passage 75 described above through an ink flow path (not shown) formed on the back surface side of the first flow path component 37 and is supplied from a liquid inlet 54 on the upstream side. Ink is flowed in the order of the ink passage 75, the back side ink passage (not shown), the through hole 77, and the front side ink passage 76 b, and is guided to the recesses 67 and 69.

  Similarly, on the surface of the first flow path component 37, a plurality of (four in the present embodiment) valves having the same configuration are provided at positions facing the respective valve housing recesses 64 on the pressure chamber component 36 side. The receiving holes 78 are formed so as to have a mirror surface relationship with the corresponding valve receiving recesses 64. And in each of these valve accommodation holes 78, through holes (not shown) penetratingly formed in the inner bottom surfaces of the respective recesses 70 to 73, and the back surface of the first flow path component 37 in succession to these through holes. Ink is guided from the recesses 70 to 73 on the upstream side through an ink flow path (not shown) formed on the side.

  Similarly, on the surface of the first flow path component 37, the pressure chamber component 36 and the protection plate 39 are laminated on the first flow path component 37 at a position corresponding to the notch 55 on the pressure chamber component 36 side. In this case, screw insertion holes 79 that are aligned with the front end surfaces of the columnar portions 41 of the protection plate 39 (that is, the screw holes 41a) are formed. Similarly, on the surface of the first flow path component 37, the first flow path component 37 and the pressure chamber component 36 are placed at positions corresponding to the insertion holes 57 and the pilot holes 58 on the pressure chamber component 36 side. Each insertion hole 80 and each pilot hole (positioning means) 81 that are aligned when bonded in the stacking direction are formed through.

  As shown in FIG. 10, on the surface of the first flow path component 37, the outer peripheries of the concave portions 70 to 73, the ink passages 75, the ink flow paths 76 a to 76 c, and the valve housing holes 78 are provided. The adhesive application part 37a corresponding to the to-be-adhered area | region 36b of the pressure chamber component 36 mentioned above is provided so that it may follow. Further, outside the adhesive application part 37a, when the first flow path part 37 and the pressure chamber part 36 are joined in the stacking direction, they are aligned with the nut mounting parts 36c on the pressure chamber part 36 side. Screw insertion holes 37b (only two are shown in FIG. 10) are formed.

Next, a specific configuration of the second flow path component 38 will be described.
As shown in FIG. 11, the second flow path component 38 is a resin plate having a rectangular shape in plan view, and the outer shape when projected in the stacking direction is substantially the same as that of the first flow path component 37. It is formed in the shape to become. That is, the second flow path component 38 is formed in the outer shape so that one end side portion is formed longer than the first flow path component 37 and the terminal insertion portion 82 is provided in the one end side portion. The flow path component 37 has a difference in outer shape.

  FIG. 11 is a perspective view of the second flow path component 38 as seen from obliquely above. As shown in FIG. 11, the surface of the second flow path component 38 is opposed to the first flow path component 38 when stacked. Each flow path, each recessed part, each hole, etc. are arrange | positioned so that it may have a mirror surface relationship with the back surface of the flow-path component 37. FIG. That is, at the position facing each recess (not shown, but centered on each through hole 77) formed on the back surface side of the first flow path component 37 at the time of stacking, a plurality of (book In the embodiment, four recesses 83 are formed. A liquid outlet 84 serving as an ink outlet from the valve unit 22 is formed through the inner bottom surface of each recess 83.

  A circular outlet-side filter member 85 made of a metal mesh is thermally welded to the large diameter portion in each recess 83 in the second flow path component 38. These outlet-side filter members 85 have a function of capturing foreign matter by filtering the ink when the foreign matter is contained in the ink that flows out of the valve unit 22 from the liquid outlet 84. . In the case of this embodiment, the roughness of the outlet filter member 85 is set to about 19 microns so that foreign matter smaller than 20 microns corresponding to the opening diameter of the nozzle 13a (see FIG. 22) of the recording head 13 can be captured. ing. That is, the outlet side filter member 85 has a filter function capable of capturing finer foreign matters than the inlet side filter member 74.

  Further, as shown in FIG. 11, on the surface of the second flow path component 38, the position corresponding to each valve accommodation hole 78 on the first flow path component 37 side is inserted into each valve accommodation hole 78. A plurality of possible (four in this embodiment) cylindrical seats 86 are formed to protrude. Each cylindrical seat 86 has a substantially C-shaped cross-section in which the side wall of the cylindrical body whose distal end side is smaller in diameter than the proximal end side is cut out at only one location in the vertical direction. An ink flow path (a part of the liquid supply path) 87 is formed on the surface of the second flow path component 38 so as to be connected to the inside of each cylindrical seat 86 through the notched portion. . These ink flow paths 87 are formed on the inner bottom surfaces of the recesses 70 to 73 of the first flow path component 37 when the first flow path component 37 is stacked on the second flow path component 38. A through hole (not shown) is formed so as to connect between each corresponding position and each cylindrical seat 86.

  Similarly, on the surface of the second flow path component 38, the first flow path component 38 is positioned on the second flow path component 38 at a position corresponding to the screw insertion hole 79 on the first flow path component 37 side. Screw insertion holes 88 that are aligned with the corresponding screw insertion holes 79 when the layers 37 are stacked are formed. Similarly, on the surface of the second flow path component 38, the second flow path component 38 and the first flow path are located at positions corresponding to the insertion holes 80 and the pilot holes 81 on the first flow path component 37 side. The through holes 89 and the pilot holes (alignment means) 90 that are aligned when the flow path components 37 are joined in the stacking direction are formed through.

  Then, as shown in FIG. 11, the first flow path is formed on the surface of the second flow path component 38 along the outer peripheral edges of the respective recesses 83, the respective ink flow paths 87, and the respective screw insertion holes 88. An adhesive application portion 38 a corresponding to an adherend region (not shown) provided on the back side of the component 37 is provided. Further, on the surface of the second flow path component 38, the first flow path is formed outside the adhesive application part 38a when the second flow path component 38 and the first flow path component 37 are joined in the stacking direction. Similarly, each screw insertion hole 38 b is formed at a position corresponding to each screw insertion hole 37 b of the component 37.

  When the first flow path component 37 and the pressure chamber component 36 are stacked on the second flow path component 38 as described above, the valve housing hole 78 of the first flow path component 37 and the valve of the pressure chamber component 36 are stacked. A movable valve (open / close valve) 91 shown in FIG. A seal spring 92 shown in FIG. 13 is mounted on the cylindrical seat 86 of the second flow path component 38.

  As shown in FIG. 12, the movable valve 91 includes a shaft portion 91 a that can be inserted into the inlet 51 of the pressure chamber part 36, a valve housing recess 64 of the pressure chamber part 36, and a valve housing of the first flow path part 37. And a flange portion 91b that can move in the hole 78 in the axial direction of the shaft portion 91a. An annular seal portion 91c made of an elastomer or the like is formed on the surface side of the flange portion 91b by two-color molding. The seal spring 92 is a coil spring formed so as to have a truncated cone shape that matches the outer surface shape of the cylindrical seat 86, and the proximal end of the shaft portion 91a of the movable valve 91 is inserted into the distal end portion of the small diameter. It has come to be.

  Therefore, next, the manufacturing method of the valve unit 22 in which the protection plate 39, the pressure chamber component 36, the first flow path component 37, and the second flow path component 38 configured as described above are assembled and integrated in a stacked state. Will be described with reference to FIGS. 14 to 19, for the sake of simplicity of the drawings, for example, the reference numerals regarding the detailed configuration of each part such as the first flow path part 37 are omitted.

  As shown in FIGS. 14 to 19, when assembling the valve unit 22 in a stacked state, an assembling jig 100, a screw member 101 as a pressure contact means, and an adhesive (not shown) are used. The assembling jig 100 includes a flat substrate 100a, and a plurality of (two in this embodiment) alignment rods 100b are erected from the upper surface of the substrate 100a at regular intervals. Yes. The distance between the alignment rods 100b is such that the pair of pilot holes 39a, 58, 58 formed in the protective plate 39, the pressure chamber part 36, the first flow path part 37, and the second flow path part 38, respectively. This corresponds to the formation interval of 81,90.

  And when assembling each part on the board | substrate 100a of this jig | tool 100 in the lamination | stacking state, as shown in FIG. Furthermore, the pressure chamber part 36, the first flow path part 37, and the second flow path part 38 are stacked and assembled in this order. At that time, the protective plate 39, the pressure chamber component 36, the first flow path component 37, and the second flow path component 38 are reversed so that the front side faces downward and the back side faces upward. Laminate in a stacked state.

  First, as shown in FIG. 15, the protection plate 39 is placed on the substrate 100 a of the jig 100 in an inverted state with the surface side facing downward. At that time, the protection plate 39 is inserted into the corresponding pilot holes 39a with the respective alignment rods 100b erected from the substrate 100a of the jig 100. Then, the protection plate 39 is in a positioning state in which the columnar portion 41 is directed vertically upward on the substrate 100a of the jig 100 and the movement in the horizontal direction is restricted. In this case, a barrier film 49 is heat-welded in advance on the surface side of the protective plate 39.

  Next, the sealing film 44 is attached to the back side of the protective plate 39 facing upward. At that time, the sealing film 44 is aligned with each of the four columnar portions 41 erected from the back surface side of the protective plate 39 and corresponding to the two columnar portions 41 having a short separation distance in the short direction. It is inserted into the hole 46. Then, the sealing film 44 is disposed at an appropriate position that covers each groove-like recess 42 formed on the back surface side of the protective plate 39. In this state, the sealing film 44 is heat-welded so as to be bent in a little dome shape toward the inner side of the groove-shaped recess 42 by pressure molding. The sealing film 44 may be attached to the back side of the protective plate 39 in advance.

  Then, as shown in FIG. 16, the pressure chamber part 36 is disposed at an upper position of the protective plate 39 in an inverted state with the surface side facing downward. In this case, on the surface side of the pressure chamber component 36, the elastic plate member 62 is attached in advance so that the elastic pieces 60 serving as the operation levers are positioned in the corresponding groove-like flow paths 50. Then, an adhesive is applied to the adhesive application portion 36 a on the surface side facing downward in the pressure chamber component 36, and the pressure chamber component 36 thus applied with the adhesive is laminated on the back surface of the protective plate 39. . At that time, the pressure chamber part 36 is inserted into the pilot holes 58 corresponding to the alignment rods 100b of the jig 100, respectively.

  Then, in the pressure chamber part 36, each columnar portion 41 of the protection plate 39 is inserted into each notch portion 55 and each insertion hole 57, and the pedestal portion 53 located in the vicinity of one long side on the surface side is protected. It fits into the notch 40 of the plate 39. Further, in the pressure chamber part 36, the atmosphere communication hole 59 formed between the two insertion holes 57 communicates with the corresponding atmosphere communication hole 48 on the protection plate 39 side. In this state, the pressure chamber component 36 has a region to be bonded on the sealing film 44 in which the adhesive application portion 36a on the front surface side is attached to the back surface side of the protective plate 39 (not shown, but each groove shape It is arranged at an appropriate position aligned with the area along the outer periphery of the recess 42.

  Then, as shown in FIG. 17, the first flow path component 37 is disposed at an upper position of the pressure chamber component 36 in an inverted state with the surface side facing downward. In this case, the inlet-side filter member 74 is mounted in advance in the recesses 70 to 73 of the first flow path component 37. Further, a hexagon nut (not shown) is fitted in advance to each nut mounting portion 36c on the back surface side facing upward of the pressure chamber part 36. The adhesive is applied to the adhesive application portion 37 a on the surface side facing downward in the first flow path component 37, and the first flow path component 37 thus applied with the adhesive is the pressure chamber component 36. Laminated on the back side. At that time, the first flow path component 37 is inserted into the pilot hole 81 corresponding to each alignment rod 100 b of the jig 100.

  Then, the screw passage holes 79 and 80 of the first flow path component 37 are aligned with the screw holes 41a formed in the front end surfaces of the columnar portions 41 of the protection plate 39, and the screw passage holes 37b. Is aligned with each nut mounting portion 36 c of the pressure chamber component 36. In the first flow path component 37, the recesses 70 to 73 and the ink flow paths 76a to 76c are aligned with the corresponding recesses 66 to 69 and the ink flow paths 65a to 65c on the pressure chamber component 36 side. In addition, each valve accommodation hole 78 is aligned with each valve accommodation recess 64 of the pressure chamber component 36. In this state, the first flow path component 37 is disposed at an appropriate position where the adhesive application portion 37a on the front surface side is aligned with the adherend region 36b provided on the back surface side of the pressure chamber component 36. The

  Then, as shown in FIG. 18, the valve accommodating hole 78 of the first flow path component 37 in which the movable valve 91 and the seal spring 92 are aligned on the valve accommodating recess 64 of the pressure chamber component 36. Inserted inside. That is, first, the movable valve 91 is inserted from the valve accommodating hole 78. Then, the shaft portion 91a of the movable valve 91 is inserted into the inlet 51 of the pressure chamber part 36, the flange portion 91b thereof is inserted into the valve accommodating recess 64 of the pressure chamber component 36, and the seal portion 91c is further provided. The pressure chamber component 36 is in contact with the inner bottom surface of the valve housing recess 64. Next, the seal spring 92 is inserted into the valve accommodating hole 78 of the first flow path component 37 so that the proximal end of the shaft portion 91a of the movable valve 91 is inserted into the tip portion of the small diameter. .

  Then, as shown in FIG. 19, the second flow path component 38 is disposed at an upper position of the first flow path component 37 in an inverted state with the surface side facing downward. In this case, the outlet side filter member 85 is mounted in advance in each recess 83 of the second flow path component 38. The adhesive is applied to the adhesive application portion 38a on the surface side facing downward in the second flow path component 38, and the second flow path component 38 thus applied with the adhesive is the first flow path. It is laminated on the back surface of the component 37. At that time, the second flow path component 38 is inserted into the pilot hole 90 corresponding to each alignment rod 100 b of the jig 100.

  Then, the second flow path component 38 has its screw insertion holes 88, 89, and 38b aligned with the screw insertion holes 79, 80, and 37b of the first flow path component 37, and the recesses 83 and The ink flow paths 87 and the like are aligned with the corresponding recesses (not shown) and the ink flow paths (not shown) on the first flow path component 37 side. Further, in the second flow path component 38, each cylindrical seat 86 is inserted into each valve accommodation hole 78 of the first flow path component 37, and the seal spring 92 already inserted in the valve accommodation hole 78. The distal end of the cylindrical seat 86 is inserted into the large-diameter proximal end portion. Then, in this state, the second flow path component 38 is aligned with an adherend region (not shown) in which the adhesive application portion 38 a on the front surface side is provided on the back surface side of the first flow path component 37. Placed in the proper position.

  Then, as shown in FIG. 19, a plurality (four in this embodiment) of screw members 101 are inserted into the screw insertion holes 88 and 89 of the second flow path component 38. And the front-end | tip of each screw member 101 passes through each screw insertion hole 79,80 of the 1st flow path component 37, and is the protection board currently inserted in each notch part 55 and each insertion hole 57 of the pressure chamber part 36. The screw holes 41a of the 39 columnar portions 41 are screwed together. Then, due to the screw tightening force of the screw member 101, the flow path forming bodies (the pressure chamber part 36, the first flow path part 37, and the second flow path part 38) together with the protection plate 39 are adjacent in the stacking direction. The other flow path forming bodies are held in pressure contact with each other while interposing an adhesive.

  Then, in this state where the flow path forming bodies adjacent in the stacking direction (for example, the first flow path part 37 and the second flow path part 38) are in pressure contact with each other, they are interposed between the flow path formation bodies. The applied adhesive remains in a dry state, but dries and hardens while being held in a pressure contact state by the screw tightening force of the screw member 101. That is, in the case of this embodiment, the protection plate 39, the pressure chamber component 36, the first flow path component 37, and the second flow path component 38 are assembled in a laminated state without having to wait for the adhesive to dry and harden. Thus, the manufacture of the integrated valve unit 22 is completed.

  Next, the head case 102 of the recording head 13 is integrated with the valve unit 22 thus integrated. That is, as shown in FIG. 20, the head connection port seal rubber 103, the outer peripheral seal rubber 104, and the head substrate 105 are interposed on the back surface side of the second flow path component 38 from which the head connection port 22a protrudes in the valve unit 22. Then, the head case 102 is attached. At that time, fastening screws 107 are respectively inserted into a plurality (three in this embodiment) of screw holes 106 formed in the head case 102.

  Then, the end of each fastening screw 107 passes through each screw insertion hole 38 b of the second flow path component 38 and each screw insertion hole 37 b of the first flow path component 37 in the valve unit 22, and the pressure chamber part 36. Screwed into a hexagon nut (not shown) fitted in each nut mounting portion 36c. When the head case 102 is integrated with the valve unit 22 by the fastening force of the fastening screw 107, the head unit 108 shown in FIG. 21 is completed.

  That is, a plurality of liquid supply paths are provided that can supply each of the inks supplied from the plurality of ink cartridges 16 to the recording head 13 in which a plurality of nozzle rows 13A individually corresponding to the ink cartridges 16 are formed. The valve unit 22 is manufactured. In the case of the present embodiment, the liquid supply path in the valve unit 22 includes the groove-like flow path 50 (pressure chamber 50A), the ink flow paths 65a to 65c, 76a to 76c, 87, and the recesses 66 to 69, 70 to 73. , 83 and the like.

  In the valve unit 22, the common components (for example, the groove-like flow paths 50 (pressure chambers 50 </ b> A)) that are functionally common to the other liquid supply paths in each liquid supply path, the ink flow paths 76 a, The recesses 70 to 73 are formed in the same flow path forming body (for example, the pressure chamber part 36 and the second flow path part 38). Therefore, for example, pressure fluctuations do not vary between the pressure chambers 50A in each liquid supply path. The head unit 108 (valve unit 22) manufactured in this manner is mounted on the carriage 14.

  Next, the operation of the head unit 108 configured as described above will be described with reference to FIG. FIG. 22 is a schematic diagram for explaining an outline of an ink supply state in the head unit 108, particularly in the valve unit 22, and a specific configuration of the valve unit 22 is partially omitted for simplification of the drawing. is there.

  The ink supplied into the valve unit 22 via the ink supply tube 23 is temporarily stored in the pressure chamber 50A, and then supplied to each nozzle row 13A (see FIG. 20) of the recording head 13 to be supplied to the nozzle 13a. Is injected from. Then, in a state where ink is temporarily stored in the pressure chamber 50A, when ink flows out from the pressure chamber 50A to the recording head 13 side through the outlet 52 as ink is ejected from the nozzle 13a, the pressure chamber 50A. Pressure fluctuations (that is, negative pressure) are generated inside.

  Then, based on the generation of the negative pressure, the sealing film 44 is displaced so as to bend inward (downward in FIG. 22) of the pressure chamber 50A, and presses the elastic piece (operating lever) 60 inward of the pressure chamber 50A. As a result, the elastic piece 60 moves the movable valve 91 at the valve closing position shown in FIG. 22 downward (that is, opened) against the urging force of the seal spring 92 by the operating force obtained by multiplying the displacement force of the sealing film 44. The valve is opened in the direction of the valve position). As a result, since the movable valve 91 opens the inlet 51 of the pressure chamber 50A, the ink flow paths 65a, 65b, 76a, and 76b that form part of the liquid supply path in the valve unit 22 pass through the inlet 51. Ink flows into the pressure chamber 50A.

  Then, since the pressure in the pressure chamber 50A is increased by the inflow of the ink and the negative pressure state is eliminated, the sealing film 44 returns to the original form shown in FIG. 22, and the elastic piece 60 is also in the original form shown in FIG. Therefore, the movable valve 91 moves to the valve closing position where the inlet 51 is closed again by the biasing force of the seal spring 92 (that is, the valve closing operation). Therefore, in the valve unit 22, the inflow of ink from the inlet 51 into the pressure chamber 50A is regulated.

  In such a case, foreign matter may be contained in the ink supplied through the ink supply tube 23. However, in the present embodiment, such foreign matter is first captured by the inlet side filter member 74. As a result, since such foreign matter does not reach the downstream side of the inlet side filter member 74, a situation in which the seal portion 91c of the movable valve 91 bites the foreign matter and impairs the sealing performance is suppressed. Further, while the pressure chamber 50A is maintained in a clean environment, ink is temporarily stored and ink is supplied to the recording head 13 side.

  On the other hand, in the case of fine foreign matters (for example, less than 29 microns) that cannot be captured by the foreign matter capturing function of the inlet side filter member 74, they may be supplied to the recording head 13 via the pressure chamber 50A. is there. However, in the case of this embodiment, since the outlet side filter member 85 having a better foreign matter capturing function than the inlet side filter member 74 is provided in the valve unit 22, such fine foreign matter is prevented from flowing into the liquid outlet 84. The nozzle 13a is not clogged by being supplied to the recording head 13 side.

  In addition, foreign matter may enter the head case 102 of the recording head 13 during the manufacturing stage. When such foreign matter is mixed into the ink supplied to each nozzle row 13A from the valve unit 22 side through the ink flow path (liquid supply path) (not shown) in the head case 102, the fine nozzle 13a is caused by the foreign matter. Will be clogged. In such a case, in this embodiment, the fastening screw 107 is removed to separate the head case 102 from the valve unit 22, and from the side opposite to the nozzle 13a of the recording head 13 (that is, from the upstream side in the ink flow direction). A method is employed in which the recording head 13 is back-washed by forcibly sucking the ink flow path in the head case 102 to reversely flow the ink. Even when such reverse cleaning is performed, the filter member is not provided in the middle of the ink flow path in the head case 102. Therefore, the foreign matter as described above together with the ink flowing back in the ink flow path is provided. Is discharged outside the head case 102 (outside the recording head 13).

Therefore, the following effects can be obtained in the above embodiment.
(1) The valve unit 22 supplies each ink supplied from each ink cartridge 16 to the recording head 13 side individually through a liquid supply path corresponding to each ink cartridge 16 and each nozzle row 13A. In this case, each of the liquid supply paths has a common functional part (for example, the groove-like flow paths 50 (pressure chambers 50A), the ink flow paths 76a, and the recesses 70 to 73 that are functionally common to the other liquid supply paths. Are formed in the same flow path forming body (for example, the pressure chamber part 36 and the second flow path part 38). Therefore, the supply function of each ink is suppressed from varying between the liquid supply paths (for example, between the pressure chambers 50A), and the condition of ink supply through each liquid supply path can be made uniform.

  (2) In each liquid supply path, each pressure chamber (each liquid storage part) 50A constituting a part of the liquid supply path is identical to each other with respect to a single pressure chamber component (the same flow path forming body) 36. It is formed to form. For this reason, when ink is ejected from the nozzle row 13A of the recording head 13, the pressure fluctuation (that is, the negative pressure) generated in each pressure chamber 50A is suppressed from varying between the pressure chambers 50A. Accordingly, it is possible to equalize the outflow of ink from each pressure chamber 50A to the recording head 13 side.

  (3) Since the pressure chambers 50A are constituted by the groove-like channels 50 arranged in parallel so as to extend in the same direction in parallel to each other, the plurality of pressure chambers 50A are connected to the same channel forming body (this embodiment) In the embodiment, the pressure chamber component 36) can be formed while saving space. Therefore, it is possible to contribute to miniaturization of the printer 10 as compared with the case where the flow path constituting the pressure chamber is a circular flow path or the like.

  (4) A single sealing film (film member) 44 on the front surface side (one surface side) in which a plurality of groove-like flow channels 50 in the pressure chamber part 36 which is one of the flow channel forming bodies are arranged in parallel. By simply attaching, a plurality of pressure chambers (liquid storage portions) 50A are formed at a time. Therefore, the manufacturing efficiency of the valve unit 22 can be improved by the amount of the number of times of attaching the sealing film as compared with the case where the belt-like sealing film is attached individually for each of the plurality of groove-like flow paths 50.

  (5) A movable valve (open / close valve) 91 is individually arranged at each inlet 51 of each pressure chamber 50A, and each pressure chamber 50A is operated to open each movable valve 91. The sealing film 44 that is displaced along with the generation of the negative pressure inside is formed of a single film member. Therefore, it is possible to suppress variation in valve opening timing between the movable valves 91 that are also common components functionally common to other liquid supply paths in each liquid supply path. Accordingly, this point can also contribute to the uniform outflow of ink from each pressure chamber 50A to the recording head 13 side.

  (6) When an operation lever for opening the movable valve 91 is provided in each of the plurality of pressure chambers 50A, a single elastic plate member 62 is formed in a comb-like shape from the substrate portion 61. It is only necessary to align and attach the elastic pieces 60 to the surface side of the pressure chamber component 36 so that each elastic piece 60 individually corresponds to each pressure chamber 50A. Therefore, since the elastic pieces 60 as a plurality of operating levers can be attached to the pressure chamber part 36 with one touch, the manufacturing efficiency of the valve unit 22 is improved in this respect as well.

  (7) In the case of the valve unit 22 of the present embodiment, it is possible to make the supply condition of each ink supplied separately to each nozzle row 13A of the recording head 13 via each liquid supply path (for example, the pressure chamber 50A). . Therefore, the ink ejection state from each nozzle row 13A is prevented from varying between the nozzle rows 13A. Therefore, the ejection state of each ink from each nozzle row 13A can be made uniform.

  (8) When a plurality of flow path forming bodies such as the pressure chamber part 36 and the first flow path part 37 are stacked with an adhesive interposed between the flow path forming bodies adjacent in the stacking direction, Even if the adhesive interposed between the flow path forming bodies remains dry, the subsequent flow path forming bodies are sequentially laminated with another flow path forming body adjacent in the stacking direction. can do. That is, the screw member 101 as the pressure contact means holds the flow path forming bodies so as not to be displaced or separated even when the adhesive interposed between them is not yet dried and hardened. Therefore, when manufacturing the integrated valve unit 22 by bonding a plurality of flow path forming bodies with an adhesive, the integration operation can be completed without waiting for the time for the adhesive to dry and harden. .

  (9) At the manufacturing stage of the valve unit 22, it is possible to contribute to speeding up the integration work of the respective flow path forming bodies that are simply laminated using a general-purpose product called the screw member 101. In this case, it is also possible to adjust the pressure contact state between the adjacent flow path forming bodies by adjusting the screw tightening force of the screw member 101.

  (10) Even when the number of flow path forming bodies constituting the valve unit 22 (the number of stacked layers) is large, each flow path forming body (pressure chamber component) that is in a stacked state by screwing the screw member 101 only once. 36, the integration work of the first flow path component 37 and the second flow path component 38) can be completed. Therefore, in this respect, the manufacturing efficiency of the valve unit 22 as the liquid supply device is improved.

  (11) When the flow path forming bodies constituting the valve unit 22 are stacked, the flow path forming bodies adjacent to each other in the stacking direction (for example, the pressure chamber part 36 and the first flow path part 37) are aligned. By using the positioning function of the pilot holes 58 and 81 as a means, it is possible to satisfactorily stack while aligning the positions so that the outline shapes in a plan view are substantially matched.

  (12) The valve unit (liquid supply device) 22 equipped in the printer (liquid ejecting apparatus) 10 is a state in which an adhesive is interposed between the flow path forming bodies adjacent to each other in the stacking direction. In the case of forming by stacking and integrating, the valve unit 22 can be manufactured integrally without waiting for the drying and curing time of the adhesive. As a result, the manufacturing efficiency of the printer 10 including the valve unit 22 can be improved.

  (13) Even if foreign matter is included in the ink supplied toward the recording head 13 on the downstream side via the liquid supply path (such as the pressure chamber 50A) in the valve unit 22, such a case The foreign matter is captured by the outlet side filter member 85 mounted in the middle of the liquid supply path in the valve unit 22 (recessed portion 83). Therefore, the ink supplied from the upstream side of the valve unit 22 can be supplied to the recording head 13 on the downstream side while removing foreign matters. Further, when a foreign substance exists in the ink flow path (liquid supply path) in the head case 102, the foreign substance can be discharged out of the recording head 13 by reverse cleaning of the recording head 13.

  (14) In the valve unit 22, when foreign matter is contained in the ink supplied from the ink cartridge 16 side, the foreign matter can be captured and removed by the inlet side filter member 74. The inside of the pressure chamber 50A or the like can be made a clean ink supply environment. Accordingly, the possibility that the seal portion 91c of the movable valve (opening / closing valve) 91 bites in the foreign matter can be reduced, and the sealing function is not impaired. .

  (15) Even if foreign matter that could not be captured by the inlet-side filter member 74 tries to flow out from the valve unit 22 to the downstream side where the recording head 13 is located, such foreign matter will be removed by the inlet-side filter member. Since it can be captured by the outlet-side filter member 85 disposed downstream of 74, clean ink from which foreign matter has been removed can be supplied to the recording head 13 on the downstream side.

  (16) Since the coarseness of the outlet filter member 85 in the valve unit 22 is set so as to be able to capture foreign matters smaller than the diameter of the nozzle 13a of the recording head 13, it is supplied downstream from the valve unit 22. It is possible to suppress the occurrence of such a problem that the ink blocks the upstream end of the nozzle 13a of the recording head 13.

  (17) Even if foreign matter is contained in the ink that has flowed into the liquid supply path of the valve unit 22, such foreign matter is removed by the inlet-side filter member 74, so that the inlet to the pressure chamber 50A is introduced. It is possible to reduce the possibility that the movable valve 91 that is arranged at 51 and adjusts the inflow state of the ink into the pressure chamber 50A bites foreign matter. Therefore, since the sealing function of the movable valve (open / close valve) 91 is not impaired, it is possible to suppress unstable pressure fluctuation in the pressure chamber 50A.

  (18) Each filter member 74, 85 is predetermined in any one of the flow path forming bodies before the other flow path forming body is superimposed on one flow path forming body of both flow path forming bodies adjacent in the stacking direction. It can be mounted on the positions (recesses 70 to 73, 83) in a mounting manner. Therefore, the mounting work of the filter members 74 and 85 becomes very simple.

  (19) Ink from which foreign matter has been removed can be supplied from the valve unit 22 to the recording head 13 by the filter members 74 and 85, and if foreign matter is present in the recording head 13, it is discharged out of the recording head 13 by reverse cleaning. Therefore, in the printer 10, a good ink ejection state can be obtained.

The above embodiment may be changed to another embodiment (another example) as follows.
In the above embodiment, the filter members 74 and 85 may be mounted by press-fitting into the liquid inlet 54 and the liquid outlet 84 in the valve unit 22.

  -In the said embodiment, the roughness of each eye of the inlet side filter member 74 and the outlet side filter member 85 may be the same setting, and arbitrary values other than the numerical value (29 microns, 19 microns) of embodiment are sufficient. It may be a setting.

-In the above-mentioned embodiment, each filter member 74 and 85 may consist of nonwoven fabrics, glass fibers, etc. other than a metal mesh.
In the above embodiment, the valve unit 22 may be configured such that the inlet side filter member 74 is omitted and only the outlet side filter member 85 is attached. In this case as well, foreign matter can be removed from the recording head 13 by reverse cleaning of the recording head 13.

  In the above embodiment, the protection plate 39, the pressure chamber part 36, the first flow path part 37, and the second flow path part 38 are each divided into four flow paths, and each of the four divided flow paths Four valve units may be formed by stacking the formed bodies and integrating them by one flow path unit. Even if it does in this way, it can enjoy the effect that the valve unit of 1 flow path unit can be manufactured rapidly, without waiting for the drying hardening time of an adhesive agent.

In the above embodiment, the pilot holes 39a, 58, 81 as positioning means are not necessarily required.
In the above embodiment, the screw member 101 as the pressure contact means may hold only two flow path forming bodies adjacent in the stacking direction in a pressure contact state with a screw tightening force. However, in this case, the necessary screw members 101 increase as the number of layers increases.

In the above embodiment, the pressing means may be a clip device instead of the screw member 101, or may be a press device.
-In the said embodiment, the elastic piece 60 which comprises an action | operation lever may be an elastic member of single-piece | unit structure one by one.

  In the above embodiment, the elastic plate member 62 is omitted, a pressure receiving plate is attached to the sealing film 44, and the pressure receiving plate acts on the movable valve 91 to open the valve as the sealing film 44 is displaced. Also good.

In the above-described embodiment, the sealing film 44 may be a plurality of band-shaped films that individually correspond to the groove-shaped recesses 42.
In the above embodiment, the flow path that forms the pressure chamber 50A in the valve unit 22 is not limited to the groove-shaped flow path 50, and may be, for example, a circular hole.

  Further, for example, if the valve unit 22 has a common component (such as the pressure chamber 50A) that is functionally common to each other in the liquid supply passages for four flow paths, A plurality of flow path forming bodies are not necessarily stacked and integrated, and a plurality of liquid supply paths (such as pressure chambers 50A) may be formed in a single flow path forming body.

  In the above embodiment, the printer 10 that ejects ink has been described as the liquid ejecting apparatus, but other liquid ejecting apparatuses may be used. For example, printing apparatuses including fax machines, copiers, etc., liquid ejecting apparatuses that eject liquids such as electrode materials and coloring materials used in the production of liquid crystal displays, EL displays, and surface-emitting displays, and bio-organic materials used in biochip manufacturing It may be a liquid ejecting apparatus for ejecting a liquid or a sample ejecting apparatus as a precision pipette. Further, the fluid is not limited to ink, and may be applied to other fluids.

1 is a schematic plan view of an ink jet printer according to an embodiment. FIG. 3 is a cross-sectional view illustrating a configuration of an ink cartridge. The perspective view of a valve unit. The disassembled perspective view from diagonally upward of a protective plate. The exploded perspective view from the slanting lower part of a protection board. The longitudinal cross-sectional view of a protection board. The exploded perspective view of a pressure chamber component. The top view of pressure chamber components. The bottom view of pressure chamber components. The perspective view of a 1st flow-path component. The perspective view of a 2nd flow-path component. The perspective view of a movable valve. The perspective view of a seal spring. The separated side view which shows the assembly | attachment process order of a valve unit. The perspective view which shows the process of setting a protective plate. The perspective view which shows the process of laminating | stacking a pressure chamber component. The perspective view which shows the process of laminating | stacking 1st flow-path components. The perspective view which shows the process of mounting | wearing a movable valve and a seal spring. The perspective view which shows the process of laminating | stacking 2nd flow-path components. The perspective view which shows the process of mounting | wearing a valve unit with a head case. The perspective view of a head unit. FIG. 22 is a schematic cross-sectional view taken along line AA in FIG. 21.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Printer as liquid ejecting apparatus, 13 ... Recording head as liquid ejecting head, 13a ... Nozzle, 13A ... Nozzle row, 16 ... Ink cartridge as liquid container, 22 ... Valve unit as liquid supply apparatus, 39a, 58, 81, 90 ... pilot holes as positioning means, 44 ... sealing film as film member, 50 ... groove-like channel, 50a ... opening, 50A ... pressure chamber as liquid reservoir, 51 ... inflow port 52 ... Outlet, 54 ... Liquid inlet, 60 ... Elastic piece constituting the operating lever, 62 ... Elastic plate, 74 ... Inlet side filter member, 84 ... Liquid outlet, 85 ... Outlet side filter member, 91 ... Opening / closing valve A movable member 101, a screw member constituting pressure contact means.

Claims (7)

In the liquid supply apparatus in which the liquid supply path capable of supplying the liquid supplied from the upstream side to the liquid jet head connected to the downstream side is formed,
A liquid inlet that allows liquid to flow into the liquid supply path from the upstream side and a liquid outlet that allows liquid to flow out from the liquid supply path toward the liquid jet head on the downstream side are formed,
In the liquid supply path, foreign matter in the liquid which is about to flow out downstream via the liquid outlet and the inlet side filter member capable of capturing foreign matter in the liquid flowing in from the upstream side via the liquid inlet. A liquid supply apparatus having at least an outlet-side filter member among the trappable outlet-side filter members. The liquid supply apparatus according to claim 1, wherein both the inlet-side filter member and the outlet-side filter member are mounted in the liquid supply path. The liquid supply apparatus according to claim 2, wherein the outlet side filter member has a filter function capable of capturing finer foreign matter than the foreign matter that can be captured by the inlet side filter member. 3. The liquid supply according to claim 1, wherein the outlet-side filter member has a filter function capable of capturing a foreign substance smaller than an opening diameter of a liquid ejecting nozzle formed in the liquid ejecting head. apparatus. In the middle of the liquid supply path, between the mounting position of the inlet side filter member and the mounting position of the outlet side filter member, a liquid storage part capable of temporarily storing the liquid is provided via the inflow port. The liquid inlet side is formed so as to communicate with the liquid outlet side via an outflow port, and the inflow port includes an inside of the liquid storage portion accompanying the outflow of liquid downstream through the outflow port. An on-off valve is provided that is displaced between a valve closing position for closing the inlet and a valve opening position for opening the inlet based on pressure fluctuations. The liquid supply apparatus according to 1. A plurality of flow path forming bodies are stacked so as to form a part of the liquid supply path between them, and the filter member is disposed between the flow path forming bodies adjacent to each other in the stacked state. The liquid supply device according to any one of claims 1 to 5. A liquid container that stores liquid, a liquid ejecting head that can eject liquid, and a liquid ejecting head that is interposed between the liquid ejecting head and the liquid container, and that supplies liquid from the liquid container side to the liquid ejecting head side And a liquid supply device
A liquid ejecting apparatus comprising the liquid supply apparatus according to any one of claims 1 to 6.

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