JP5446176B2 - Liquid ejector - Google Patents

Description

  The present invention relates to a liquid supply apparatus and a liquid ejecting apparatus for ejecting a liquid.

  Conventionally, in an ink jet printer, a filter unit for trapping dust and dirt may be provided in an ink supply unit that supplies ink of an ink cartridge to a recording head. The filter used in the filter section has a fine mesh and may trap air bubbles mixed in the ink. The trapped air bubbles may impede the flow of ink and cause ink ejection failure. In order to solve this problem, a technique for securing an ink flow path even when bubbles are trapped in a filter is known (Patent Document 1).

JP-A-5-77440 JP-A-6-336034

  However, even if the ink flow path is secured, the ink supply is inferior to the state where bubbles are not trapped, which may cause ink ejection failure. Such a problem may occur not only in an ink jet printer but also in any liquid ejecting apparatus that ejects liquid such as lubricating oil or resin liquid.

  The present invention has been made in order to solve at least a part of the above-described conventional problems, and an object thereof is to suppress the inhibition of the liquid flow caused by bubbles in the filter portion.

  In order to solve at least a part of the above problems, the present invention employs the following aspects.

  A first aspect provides a liquid supply apparatus. The liquid supply apparatus according to the first aspect of the present invention includes an introduction portion for introducing a liquid and a discharge portion for discharging the liquid, and the discharge portion is the same as the introduction portion in the vertical direction. The filter part arrange | positioned in the position more than height, and the pressurization part which supplies the said liquid pressurized to the said filter part is provided.

  According to the liquid supply apparatus according to the first aspect, the filter unit is arranged in the vertical direction so that the discharge unit is disposed at a position equal to or higher than the introduction unit and the liquid pressurized by the pressurization unit is supplied. Therefore, it is possible to suppress the inhibition of the liquid flow due to the bubbles.

  In the liquid supply apparatus according to the first aspect, the filter unit may include a filter chamber in which a filter is disposed, and the discharge unit may be disposed at an uppermost part of the filter chamber in a vertical direction. In this case, retention of bubbles in the filter chamber can be reduced, and inhibition of liquid flow due to the bubbles can be suppressed.

  In the liquid supply apparatus according to the first aspect, the wall surface of the filter chamber may be formed in a tapered shape between the filter and the discharge portion. In this case, it is possible to favorably discharge the bubbles from the discharge portion.

  In the liquid supply apparatus according to the first aspect, the filter may be arranged so as to act on the liquid that moves upward from below in the vertical direction. In this case, the bubbles trapped in the filter can be discharged from the filter chamber satisfactorily.

  A second aspect provides a liquid ejecting apparatus for ejecting liquid. A liquid ejecting apparatus according to a second aspect of the present invention includes the liquid supply apparatus according to the first aspect, and a head unit that ejects the liquid supplied from the liquid supply apparatus.

  According to the liquid ejecting apparatus according to the second aspect, the liquid can be ejected satisfactorily by suppressing the inhibition of the flow of the liquid due to the bubbles in the filter unit.

  In the liquid ejecting apparatus according to the second aspect, in the two different postures in which the liquid ejecting apparatus can eject the liquid, the discharge section is a position where the height in the vertical direction is equal to or higher than the height of the introduction section. May be arranged. In this case, in two different postures in which the liquid ejecting apparatus can eject the liquid, it is possible to suppress the inhibition of the liquid circulation due to the bubbles in the filter unit.

  In the liquid ejecting apparatus according to the second aspect, the discharge unit may be disposed at a position that is the uppermost part of the filter chamber in the vertical direction in the two postures. In this case, retention of bubbles in the filter chamber can be reduced in two different postures in which the liquid ejecting apparatus can eject liquid.

  The present invention can be realized in various modes, for example, a printer using a liquid supply apparatus, an image recording apparatus such as a facsimile apparatus, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, It can be realized by an arbitrary liquid ejecting apparatus such as an electrode material ejecting apparatus used for forming an electrode such as an organic EL display or a surface emitting display.

  Hereinafter, in order to clarify a liquid supply apparatus according to the present invention and a liquid ejecting apparatus using the liquid supply apparatus, a printer which is an aspect of the liquid ejecting apparatus will be described based on an embodiment with reference to the drawings. To do.

A. First embodiment:
A1. Printer configuration:
FIG. 1 is an explanatory diagram showing a schematic configuration of a printer 10 according to the first embodiment of the present invention. The printer 10 as a liquid ejecting apparatus in the first embodiment is an ink jet serial printer capable of ejecting ink of four colors (black, cyan, magenta, yellow). The printer 10 includes an ink cartridge 100, an ink supply device 200, a carriage 300, and a recording head 400.

  The ink cartridge 100 includes one or a plurality of ink storage units 101, and each color storage unit 101 stores ink of each color. In FIG. 1, an ink cartridge 100 including one ink storage unit 101 is illustrated. However, in the printer 10, one or a plurality of ink cartridges 100 corresponding to the above four colors are connected to the ink supply device 200. . The printer 10 is a so-called off-carriage type in which the ink cartridge 100 is mounted on the printer body side. The ink cartridge 100 is mounted on a main body frame (not shown) of the printer 10 by a cartridge holder (not shown).

  The ink supply device 200 supplies ink stored in the ink cartridge 100 to the recording head 400. The ink supply device 200 includes a cartridge connection part 210, a flow path pump part 220, a decompression pump part 230, a filter part 240, a valve unit 250, a decompression deaeration part 260, and a tube 270. The ink supply device 200 is arranged for each of the four colors. Since the configuration of the ink supply apparatus 200 is the same for each color, FIG. 1 illustrates one ink supply apparatus 200 that supplies ink of any one color.

  The cartridge connection unit 210 connects the ink supply device 200 and the ink cartridge 100. The cartridge connection unit 210 includes a hollow needle 211, and when the hollow needle 211 is inserted into the ink cartridge 100, the ink container 101 of the ink cartridge 100 and the ink flow path FC in the ink supply device 200 communicate with each other.

  The flow path pump unit 220 sucks ink from the ink cartridge 100 and pumps it to the carriage 300. The flow path pump unit 220 includes a suction side check valve 221, a pump 224, and a discharge side check valve 227. The suction side check valve 221, the pump 224, and the discharge side check valve 227 are on the ink flow path FC, and from the upstream ink cartridge 100 side, the suction side check valve 221, the pump 224, and the discharge side reverse valve. The stop valves 227 are arranged in this order.

  The suction-side check valve 221 is formed by the suction-side valve body 222 so that the ink flow path FC can be opened and closed, and functions as a one-way valve that can only move ink from the ink cartridge 100 side to the pump 224 side. The discharge-side check valve 227 is formed by the discharge-side valve body 228 so that the ink flow path FC can be opened and closed, and functions as a one-way valve that can only move ink from the pump 224 side to the recording head 400 side.

  The pump 224 includes a diaphragm 225 and a spring 226, and pumps ink from the ink cartridge 100 to the carriage 300. Specifically, the decompression pump unit 230 described later causes the upper space area M of the diaphragm 225 to be in a negative pressure state, so that the diaphragm 225 is bent upward, and a variable volume space area formed on the ink flow path FC. Increase the volume of V. The pump 224 causes the ink to flow into the space region V via the suction-side check valve 221 as the volume of the space region V increases. Further, when the negative pressure state of the upper space region M is eliminated by the decompression pump unit 230, the pump 224 pushes down the diaphragm 225 by the spring 226 and decreases the volume of the space region V. At this time, the ink stored in the space V is pumped to the recording head 400 side using the biasing force of the spring 226.

  The decompression pump unit 230 generates a negative pressure, and places the upper space area M of the pump 224 communicating with the air flow path AC and the decompression chamber 265 of the decompression deaeration unit 260 described later in a negative pressure state. The decompression pump unit 230 includes a valve body (not shown). By opening the valve body, the air flow path AC is opened to the atmosphere, and the negative pressure state of the upper space region M and the decompression chamber 265 is eliminated.

  The filter unit 240 is disposed on the ink channel FC between the channel pump unit 220 and the recording head 400, and filters ink sent from the channel pump unit 220 to the recording head 400 to remove impurities (dust Or trap dust). The filter part 240 is a characteristic part in the present invention, and the shape and configuration will be described later.

  The valve unit 250 is disposed on the ink flow path FC and between the filter unit 240 and the recording head 400, and is formed by the valve body 250b so that the ink flow path FC can be opened and closed. When the valve body 250b is in the open position, ink can flow from the filter unit 240 to the recording head 400 side. Further, when in the sealing position, ink cannot flow from the filter unit 240 to the recording head 400 side.

  The vacuum degassing unit 260 is disposed on the ink flow path FC, between the valve unit 250 and the recording head 400, and removes bubbles mixed in the ink. The decompression defoaming unit 260 includes an atmosphere chamber 261, a pressure chamber 262, a defoaming chamber 263, a negative pressure chamber 264, and a decompression chamber 265.

  The atmosphere chamber 261 communicates with the atmosphere via the atmosphere communication hole 261a. The pressure chamber 262 can temporarily store ink, and the ceiling portion has an air gap sandwiched between a partition made of a film made of a flexible member and a cantilevered thin plate member that can be displaced together with the film. Adjacent to chamber 261. The pressure chamber 262 communicates with the valve unit 250 and the defoaming chamber 263. The rod portion 250s of the valve body 250b of the valve unit 250 is joined to the partition wall portion 266 inside the pressure chamber 262, and the valve body 250b is displaced between the open position and the sealing position by the vertical displacement of the partition wall portion 266. To do. When the valve body 250 b is in the open position, ink flows into the pressure chamber 262 through the valve unit 250.

  The defoaming chamber 263 is a hollow chamber having a filter 263 f inside, and communicates with the pressure chamber 262 and the recording head 400. The defoaming chamber 263 is used to temporarily store the ink flowing in from the pressure chamber 262 and remove the gas in the ink by the defoaming operation. The ink stored in the defoaming chamber 263 is discharged to the recording head 400 through the filter 263f. The filter 263f filters the ink to remove impurities (dust, dust, etc.) and makes it difficult for air bubbles mixed in the ink flow path FC to pass through, so that air bubbles are trapped at the ceiling of the defoaming chamber 263. It also has a function to make it. The ink discharged from the defoaming chamber 263 is ejected from a large number of nozzles (not shown) provided on the nozzle plate 402 through the ink ejection pipe 404 connected to the bottom surface of the defoaming chamber 263.

  The negative pressure chamber 264 is disposed above the defoaming chamber 263 via a partition wall portion 268 made of a synthetic resin material having gas permeability. As the gas permeable member, for example, polyacetal, polypropylene, polyphenylene ether, or the like can be employed. The negative pressure chamber 264 communicates with the decompression chamber 265 via the flow path valve 267.

  The decompression chamber 265 is a hollow chamber that communicates with the decompression pump unit 230 by the air flow path AC, and is adjacent to the atmosphere chamber 261 with the partition wall 266 sandwiched between the ceiling portion and the pressure chamber 262. The rod part 267 s of the flow path valve 267 is joined to the partition wall part 266 inside the decompression chamber 265, and the flow path valve 267 is displaced between the open position and the sealing position by the vertical displacement of the partition wall part 266. When the decompression chamber 265 becomes negative pressure by driving the decompression pump unit 230, the partition wall 266 is bent and deformed toward the decompression chamber 265 due to the pressure difference with the atmospheric chamber 261. Thereby, the negative pressure of the decompression chamber 265 is introduced into the negative pressure chamber 264 by the flow path valve 267 moving to the open position. On the other hand, when the decompression chamber 265 is opened to the atmosphere by the decompression pump unit 230, the flow path valve 267 is displaced to the sealing position by the biasing force of the spring, so that the negative pressure chamber 264 is maintained in a negative pressure state. When the negative pressure chamber 264 is in a negative pressure state, bubbles or dissolved air in the ink stored in the defoaming chamber 263 passes through the partition wall 268 and is collected in the negative pressure chamber 264. Thereby, the defoaming of the ink is performed by the vacuum degassing unit 260.

  The carriage 300 is disposed so as to reciprocate in the main scanning direction along a guide rod (not shown) by the power of a carriage motor (not shown). Of the ink supply device 200, a filter unit 240, a valve unit 250, and a vacuum degassing unit 260 are mounted on the carriage 300. A tube 270 is disposed between the flow path pump unit 220 and the filter unit 240, and even when the carriage 300 is moved, ink is supplied from the flow path pump unit 220 to the filter unit 240 and a decompression chamber by the decompression pump unit 230. 265 decompression is possible. In this embodiment, the printer 10 is described as an off-carriage type, but may be a so-called on-carriage type in which the ink cartridge 100 is mounted on the carriage 300.

  The recording head 400 is disposed on the bottom surface of the carriage 300 and ejects ink droplets from a large number of nozzles (not shown) onto the recording medium as the carriage 300 reciprocates in the main scanning direction. At this time, the recording medium is fed in the sub-scanning direction by a paper feeding mechanism (not shown), and an image or the like is formed on the recording medium.

A2. Configuration of filter part:
FIG. 2 is an explanatory diagram illustrating the configuration of the filter unit according to the first embodiment. The filter unit 240 includes a filter 241, a filter chamber 242, an introduction port 243, and a discharge port 244. The filter chamber 242 is a hollow chamber, and a substantially plate-like filter 241 is arranged substantially horizontally near the center. In the present embodiment, the highest position in the vertical direction of the filter chamber 242 is referred to as the uppermost part UL, and the lowest position in the vertical direction is referred to as the lowermost part LL. The introduction port 243 is disposed in the lowermost part LL of the filter chamber 242 and introduces the ink pumped from the flow path pump unit 220 into the filter chamber 242. The discharge port 244 is disposed at the uppermost part UL of the filter chamber 242 and discharges the ink in the filter chamber 242 to the valve unit 250.

  The discharge port 244 and the introduction port 243 are arranged such that the axis OX of the discharge port 244 and the axis IX of the introduction port 243 are in the direction along the vertical direction. The discharge port 244 is arranged so that the axis OX of the discharge port 244 is shifted from the axis IX of the introduction port 243, and is arranged so as to be offset along one side end (left side in FIG. 2) in the horizontal direction of the filter chamber 242 Has been. The introduction port 243 is arranged so that the axis IX of the introduction port 243 intersects the filter 241. That is, the filter 241 is arranged in the direction of ink introduction from the inlet 243 to the filter chamber 242. The side surface 242w of the filter chamber 242 is formed in a taper shape between the filter 241 and the introduction port 243, and is also formed in a taper shape between the filter 241 and the discharge port 244.

  The printer 10 according to the present embodiment can be used in two different postures, for example, vertically and horizontally. That is, the printer 10 can perform printing not only in the first posture shown in FIG. 2 described above but also in the second posture rotated 90 degrees to the right from the first posture.

  FIG. 3 is an explanatory diagram illustrating the second posture of the filter unit. Since the filter unit 240 is arranged so that the axis OX is shifted from the axis IX in the first posture, the discharge port 244 is positioned higher than the position of the introduction port 243 in the vertical direction even in the second posture. It will be in an arranged state. Further, in the first posture, the discharge port 244 is arranged so as to be biased along one side end portion of the filter chamber 242 in the horizontal direction, so that the uppermost portion of the filter chamber 242 is also in the second posture. It will be in the state arrange | positioned in contact with UL.

A3. Air bubble removal from the filter:
A state in which bubbles in the ink are removed from the filter unit 240 in the first posture will be described. FIG. 4 is an explanatory diagram showing the flow of ink in the filter unit. FIG. 5 is an explanatory diagram showing the movement of bubbles in the filter section. The ink that has flowed into the filter chamber 242 from the introduction port 243 moves upward from the lower side in the vertical direction by the ink pumping by the flow path pump unit 220. Since the filter 241 is disposed substantially horizontally, it can act on the ink that moves upward from below in the direction of gravity. That is, the filter 241 can filter the ink that moves upward from below in the direction of gravity. In the present embodiment, the filter 241 is disposed substantially horizontally, but can act on ink that moves upward from below in the direction of gravity even if it has a predetermined angle with respect to the horizontal. The filtered ink is discharged from the discharge port 244 above the vertical direction.

  When being filtered by the filter 241, some of the bubbles BL included in the ink are trapped (trapped) by the filter 241 as shown in FIG. 4. However, the flow path pump unit 220 pumps the ink to the filter 241 so that the upward force applied to the bubbles BL by the ink pumping becomes equal to or greater than the force that the trapped bubbles BL can resist. The trapped bubbles BL cannot stay in the filter 241 and are separated from the filter 241 as shown in FIG. 5 and move upward due to the fluidity and buoyancy of the ink. Further, since the side surface 242w of the filter chamber 242 is formed in a tapered shape, the filter chamber 242 is discharged from the discharge port 244 along the bubble BLh side surface 242w.

  FIG. 6 is an explanatory view showing the flow of ink in the filter portion in the second posture. FIG. 7 is an explanatory diagram showing the movement of bubbles in the filter section in the second posture. Also in the second posture, as in the first posture, the ink that has flowed into the filter chamber 242 from the introduction port 243 by the pressure pumping of the ink by the flow path pump unit 220 is on the discharge port 244 side (upper right direction in FIG. 6). , And after passing through the filter 241 and being filtered, it is discharged from the discharge port 244. When being filtered by the filter 241, a part of the bubbles BL included in the ink is trapped (trapped) above the inlet 243 side of the filter 241 as shown in FIG. However, the flow path pump unit 220 is trapped by the filter 241 in order to pump the ink so that the force applied to the bubbles BL by the pumping of the ink is greater than or equal to the force that the trapped bubbles BL can resist. The air bubbles BL cannot stay on the inlet 243 side of the filter 241 and move to the outlet 244 side through the filter 241 as shown in FIG. The bubbles BL that have moved to the discharge port 244 are discharged from the discharge port 244 by the fluidity and buoyancy of the ink.

  According to the ink supply apparatus 200 according to the first embodiment described above, the filter unit 240 has the discharge port 244 disposed at a position equal to or higher than the position of the introduction port 243 in the vertical direction, and the flow path pump unit. Since the ink pressurized by 220 is supplied, it is possible to suppress the inhibition of the ink circulation due to the bubbles BL. Specifically, since the discharge port 244 is arranged at a position that is equal to or higher than the vertical position of the introduction port 243, the bubbles BL that have passed through the filter 241 move to the filter 241 side by buoyancy, The air bubbles BL can be moved to the discharge port 244 while being prevented from being trapped (trapped) by the filter 241 again. In addition, by supplying ink pressurized by the flow path pump unit 220, a force to push the bubble BL toward the discharge port 244 is added, and the filter 241 is not easily trapped. You can leave.

  According to the ink supply device 200 according to the first embodiment, since the discharge port 244 is disposed at the uppermost part UL of the filter chamber 242, the retention of the bubbles BL in the filter chamber 242 is reduced, and the bubbles BL Inhibition of the ink distribution due to the ink can be suppressed. Specifically, even if the bubble BL moves upward due to buoyancy and stays in the vicinity of the uppermost portion UL of the filter chamber 242, the discharge port 244 is disposed at the uppermost portion UL, so that the bubble BL resists buoyancy. It can be easily moved to the discharge port 244, and retention at the uppermost portion UL can be suppressed.

  According to the ink supply device 200 according to the first embodiment, the side surface 242w of the filter chamber 242 is formed in a tapered shape between the filter 241 and the discharge port 244, and thus the bubble BL is along the side surface 242w. It can move to the discharge port 244 and can be discharged well from the discharge port 244.

  According to the ink supply device 200 according to the first embodiment, the filter 241 is disposed horizontally so as to act on the ink moving upward from the lower side in the vertical direction, so that it is pressurized by the flow path pump unit 220. The bubbles BL can be discharged from the filter chamber 242 satisfactorily by the fluid force of the introduced ink.

  According to the printer 10 according to the first embodiment, the discharge port 244 is disposed so as to be at a position equal to or higher than the vertical position of the introduction port 243 in two different postures that the printer 10 can print. Therefore, in these two postures, it is possible to suppress the inhibition of the ink flow due to the bubbles BL in the filter unit 240.

  According to the printer 10 according to the first embodiment, the discharge port 244 is arranged at the uppermost part UL of the filter chamber 242 in two different postures that the printer 10 can print. The retention of the bubbles BL in the filter chamber 242 can be reduced, and the inhibition of the ink flow due to the bubbles in the filter unit 240 can be suppressed.

B. Variations:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

B1. Modification 1:
FIG. 8 is an explanatory diagram illustrating the configuration of the filter unit according to the first modification. In the filter unit 240 according to the first embodiment, the discharge port 244 is arranged at the uppermost part UL, but if the discharge port 244 is higher in the vertical direction than the introduction port 243, as shown in FIG. You may arrange | position other than uppermost part UL. Even in this case, since the bubbles BL in the filter chamber 242 are discharged from the discharge port 244, inhibition of the ink flow by the bubbles BL can be suppressed.

B2. Modification 2:
FIG. 9 is an explanatory diagram illustrating the configuration of the filter unit according to the second modification. In the filter unit 240 according to the first embodiment, the discharge port 244 is arranged at a position higher in the vertical direction than the introduction port 243. As shown in FIG. 9, the discharge port 244 and the introduction port 243 are arranged in the vertical direction. May be arranged at the same height. In this case, the discharge port 244 and the introduction port 243 are more preferably closer to the uppermost UL.

B3. Modification 3:
FIG. 10 is an explanatory diagram illustrating the configuration of the filter unit according to the third modification. The filter unit 240 according to the first embodiment is arranged so that the axis OX of the discharge port 244 and the axis IX of the introduction port 243 are parallel to each other, but as shown in FIG. The axis IX of OX and the introduction port 243 may not be parallel. Even in this case, since the bubble BL is discharged from the discharge port 244, the inhibition of the ink flow due to the bubble BL can be suppressed.

B4. Modification 4:
FIG. 11 is an explanatory diagram illustrating the configuration of the filter unit according to the fourth modification. In the first embodiment, the posture that is rotated 90 degrees from the first posture is the second posture. However, the second posture is not limited to this, and the discharge port 244 is arranged at the uppermost portion UL and introduced. As long as the position in the vertical direction is higher than the mouth 243, as shown in FIG. 10, the second posture may be a state rotated by an arbitrary angle from the first posture.

B5. Modification 5:
FIG. 12 is an explanatory diagram illustrating the configuration of the filter unit according to the fifth modification. The side surface 242w of the filter unit 240 according to the first embodiment is formed in a taper shape between the filter 241 and the introduction port 243, and is also formed in a taper shape between the filter 241 and the discharge port 244. However, as shown in FIG. 12, it does not have to be tapered. Further, only either one between the filter 241 and the introduction port 243 or between the filter 241 and the discharge port 244 may be formed in a tapered shape. In these cases, the introduction port 243 is more preferably closer to the uppermost part UL.

B6. Modification 6:
FIG. 13 is an explanatory diagram illustrating the configuration of the filter unit according to the sixth modification. The filter 241 of the filter unit 240 according to the first embodiment is arranged substantially horizontally or substantially vertically near the center in the filter chamber 242, but is not limited to this, and as shown in FIG. It may be arranged at any position and angle. In addition, the relationship between the discharge port 244 and the introduction port 243 may be any position and angle.

B7. Modification 7:
In the filter unit 240 according to the first embodiment, all the portions of the discharge port 244 are arranged at a position higher than the introduction port 243, but the height comparison between the discharge port 244 and the introduction port 243 is arbitrary. This may be done by comparing these parts. For example, it may be performed by comparing the positions of the upper end or the lower end of the discharge port 244 and the introduction port 243.

B8. Modification 8:
In the printer 10 according to the first embodiment, the decompression pump unit 230 is arranged for each of the four colors (black, cyan, magenta, yellow), but instead, the decompression pump unit 230 for each color. It is good also as an aspect which shares. Further, the flow path pump unit 220 may be configured to share the flow path pump unit 220 for each color instead of every four colors. In addition, although the four types of ink ejected by the printer are used, any type of ink can be ejected instead.

B9. Modification 9:
In the printer 10 according to the first embodiment, the upper space area M of the pump 224 and the decompression chamber 265 of the decompression deaeration unit 260 are brought into a negative pressure state by the common decompression pump unit 230. The space region M and the decompression chamber 265 of the decompression defoaming unit 260 may be in a negative pressure state by different pumps.

B10. Modification 10:
In the printer 10 according to the first example, the filter unit 240, the valve unit 250, and the vacuum degassing unit 260 of the ink supply device 200 are mounted on the carriage 300. The portion of the ink supply device 200 is not limited to this. For example, the filter unit 240 may not be mounted on the carriage 300.

B11. Modification 11:
The configuration of the vacuum degassing unit 260 shown in the printer 10 according to the first embodiment is an exemplification, and a different mode may be used. For example, not only the defoaming chamber 263 but also the pressure chamber 262 may be in contact with the negative pressure chamber 264, and the negative pressure chamber 264 and the decompression chamber 265 may be integrated with each other without the flow path valve 267. Also good.

B12. Modification 12:
In each of the above-described embodiments, the ink jet printer has been described. However, the present invention is not limited to this, and can be applied to any liquid ejecting apparatus that ejects liquid other than ink. For example, electrodes such as image recording devices such as facsimile machines, color material ejection heads used in the manufacture of color filters such as liquid crystal displays, organic EL (Electro Luminescence) displays, and surface emission displays (Field Emission Displays, FEDs) The present invention can also be applied to an electrode material ejecting apparatus used for forming, a liquid ejecting apparatus for ejecting a liquid containing a bioorganic material used for biochip manufacturing, a sample ejecting apparatus as a precision pipette, and the like. In addition, transparent resin liquids such as UV curable resin to form liquid injection devices that pinpoint lubricant oil onto precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. A liquid ejecting apparatus that ejects a liquid onto the substrate or a liquid ejecting apparatus that ejects an etching solution such as an acid or an alkali to etch the substrate may be employed. The present invention can be applied to any one of the various liquid ejecting apparatuses including a liquid ejecting head that ejects a minute amount of liquid droplets.

  In addition, a droplet means the state of the liquid discharged from the said liquid ejecting apparatus, and shall also include what pulls a tail in granular shape, tear shape, and thread shape. The liquid here may be any material that can be ejected by the liquid ejecting apparatus. For example, it may be in the state when the substance is in a liquid phase, and may be in a liquid state with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts) ) And a liquid as one state of the substance, as well as particles in which functional material particles made of solid materials such as pigments and metal particles are dissolved, dispersed or mixed in a solvent. In addition, typical examples of the liquid include ink and liquid crystal as described in the above embodiments. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot-melt inks.

1 is an explanatory diagram illustrating a schematic configuration of a printer according to a first embodiment of the present invention. It is explanatory drawing which illustrated the structure of the filter part which concerns on a 1st Example. It is explanatory drawing which illustrated the 2nd body posture of the filter part. It is explanatory drawing which showed the flow of the ink in a filter part. It is explanatory drawing which showed the motion of the bubble in a filter part. It is explanatory drawing which showed the flow of the ink of the filter part in a 2nd posture. It is explanatory drawing which showed the motion of the bubble of the filter part in a 2nd body posture. 10 is an explanatory diagram illustrating the configuration of a filter unit according to Modification Example 1. FIG. 11 is an explanatory diagram illustrating the configuration of a filter unit according to Modification 2. FIG. 10 is an explanatory diagram illustrating the configuration of a filter unit according to Modification 3. FIG. 10 is an explanatory diagram illustrating the configuration of a filter unit according to Modification 4. FIG. 10 is an explanatory diagram illustrating the configuration of a filter unit according to Modification Example 5. FIG. 10 is an explanatory diagram illustrating the configuration of a filter unit according to Modification 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printer 100 ... Ink cartridge 200 ... Ink supply apparatus 210 ... Cartridge connection part 220 ... Flow path pump part 230 ... Depressurization pump part 240 ... Filter part 241 ... Filter 242 ... Filter chamber 242w ... Side 243 ... Inlet 244 ... Outlet 250 ... Valve unit 260 ... Depressurized degassing part 270 ... Tube 300 ... Carriage 400 ... Recording head

Claims (6)

A liquid ejecting apparatus comprising: a head unit that ejects liquid; and a liquid supply device that supplies the liquid to the head unit,
The liquid supply device includes:
An introduction portion for introducing a liquid, and a discharge portion for discharging the liquid, a filter unit you have a filter chamber a filter is arranged,
A pressurizing unit for supplying the liquid pressurized to the filter unit ,
In the two different postures in which the liquid ejecting apparatus can eject the liquid, the filter unit is disposed at a position where the height of the discharge unit in the vertical direction is higher than the height of the introduction unit. apparatus. The liquid ejecting apparatus according to claim 1,
The discharge unit is a liquid ejecting apparatus that is disposed at a position that is the uppermost part of the filter chamber in the vertical direction in the two postures . The liquid ejecting apparatus according to claim 1 or 2,
The wall surface of the filter chamber is a liquid ejecting apparatus formed in a tapered shape between the filter and the discharge portion. In the liquid ejecting apparatus according to any one of claims 1 to 3,
The wall surface of the filter chamber is a liquid ejecting apparatus formed in a taper shape between the filter and the introduction portion. The liquid ejecting apparatus according to claim 3,
The liquid ejecting apparatus, wherein the wall surface between the filter and the discharge portion and intersecting the axis of the introduction portion is formed in a tapered shape. The liquid ejecting apparatus according to claim 1,
The liquid ejecting apparatus, wherein a valve unit that can be opened and closed is disposed in the liquid flow path between the head unit and the filter unit.

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