JP7078103B2 - tank - Google Patents

Description

The present invention relates to a tank that can be refilled with liquid through a liquid inlet.

A printer having a tank capable of replenishing ink and a recording head for ejecting ink supplied from the tank from a nozzle and recording an image on paper is known (see, for example, Patent Document 1). When the ink in the tank is consumed, the user can replenish the ink stored in the bottle from the liquid inlet of the tank.

The tank is provided with an atmospheric opening for maintaining the pressure in the tank at atmospheric pressure. In addition, a semipermeable membrane may be provided in the atmospheric flow path from the inside of the tank to the atmospheric opening. The semipermeable membrane generally refers to a membrane that allows some components to pass through, such as a solution or a gas mixture, but does not allow other components to pass through. However, the semipermeable membrane used for the air flow means a membrane that allows gas to pass through but does not allow liquid to pass through. As a result, even if the ink stored in the tank enters the air flow path, the flow of the ink is stopped by the semipermeable membrane. Therefore, it is prevented that the ink leaks to the outside of the tank from the air opening.

Japanese Unexamined Patent Publication No. 2012-51306

However, if the semipermeable membrane gets wet with ink, the semipermeable membrane may be blocked by the ink. If the semipermeable membrane is blocked with ink, the ink may be impervious to gas. As a result, the pressure in the tank may not be maintained at atmospheric pressure.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a tank capable of reducing the adhesion of a liquid to a semipermeable membrane.

(1) The tank according to the present invention is placed in a device having a liquid consumption unit. The tank according to the present invention has a first storage chamber for storing liquid, a second storage chamber for storing liquid, a first communication passage, a second communication passage, and a housing having a third communication passage. A liquid inlet for injecting liquid into the chamber and the second storage chamber, a first communication port communicating with one end of the first storage chamber and the first communication passage, the first storage chamber and the second communication port. The liquid is consumed by the second communication port that communicates with the storage chamber, the atmosphere opening port that communicates with the third communication passage and the outside of the tank, and the liquid stored in the first storage chamber and the second storage chamber. It includes a liquid outlet that flows out toward the portion, and a semi-permeable film that is provided in the third communication passage and blocks the flow of the liquid in the third communication passage. The second communication passage communicates with the second storage chamber at one end and communicates with the other end of the first communication passage at the other end. The third communication passage communicates with the other end of the second communication passage at one end and communicates with the atmosphere opening at the other end.

According to the above configuration, in order for the liquid in the first storage chamber to enter the third passage and come into contact with the semipermeable membrane, the liquid needs to pass through the first passage. Further, in order for the liquid in the second storage chamber to enter the third passage and come into contact with the semipermeable membrane, the liquid needs to pass through the second passage.

Further, according to the above configuration, the first communication passage and the second communication passage communicate with each other at the communication points between the first communication passage, the second communication passage and the third communication passage. Therefore, at least a part of the liquid circulated from the first communication passage to the communication location enters the second communication passage instead of the third communication passage. Further, at least a part of the liquid circulated from the second communication passage to the communication location enters the first communication passage instead of the third communication passage.

From the above, according to the above configuration, it is possible to reduce the contact of the liquid stored in the first storage chamber and the second storage chamber with the semipermeable membrane.

(2) The tank according to the present invention has a third communication port for communicating liquid from the other end of the first communication passage and the other end of the second communication passage to the third communication passage along the first direction. To prepare for. The third communication port is provided at a position different from that of the semipermeable membrane in the second direction orthogonal to the first direction.

According to the above configuration, the third communication port allows the liquid to communicate from the first communication passage and the second communication passage to the third communication passage along the first direction. Therefore, the liquid that enters the third communication passage from the first communication passage and the second communication passage through the third communication port flows along the first direction. Further, according to the above configuration, the semipermeable membrane is provided at a position different from that of the third communication port in the second direction. Therefore, the liquid that has entered the third passage does not reach the semipermeable membrane unless the direction is changed from the first direction. As described above, according to the above configuration, it is possible to reduce the contact of the liquid that has entered the third communication passage from the first communication passage and the second communication passage through the third communication port to the semipermeable membrane. ..

(3) For example, the third communication passage includes a flow passage extending along the second direction, and the semipermeable membrane is provided in the flow passage.

(4) The portion where the liquid level of the liquid is located in the second storage chamber when the maximum amount of liquid that can be stored is stored in the usage posture of the tank is the second storage chamber and the second storage chamber. It is the boundary position with the continuous passage. The length along the flow direction of the liquid between the boundary position in the second communication passage and the third communication port is between the first communication port and the third communication port in the first communication passage. It is almost the same as the length along the flow direction of the liquid.

According to the above configuration, one of the liquid flow distance between the first storage chamber and the third passage or the liquid flow distance between the second storage chamber and the third passage is extremely short. Never. Therefore, it is possible to suppress the entry of the liquid stored in the first storage chamber and the second storage chamber into the third passage.

(5) The housing is a part of the bottom surface that divides the lower end of the third passage in the usage posture of the tank, and becomes the semipermeable membrane closer to the second passage than the semipermeable membrane. It has adjacent adjacent surfaces. The adjacent surface is inclined with respect to the horizontal direction so that the portion close to the semipermeable membrane is higher than the portion away from the semipermeable membrane.

According to the above configuration, in order for the liquid that has entered the third passage from the first passage and the second passage to come into contact with the semipermeable membrane, the liquid needs to flow on the adjacent surface inclined upward. be. This makes it possible to reduce the contact of the liquid with the semipermeable membrane.

(6) A labyrinth-shaped labyrinth passage is provided between the semipermeable membrane and the atmospheric opening.

According to the above configuration, even if the liquid passes through the semipermeable membrane due to an accident such as the breakage of the semipermeable membrane, the liquid is suppressed from flowing out to the outside of the tank through the air opening.

According to the tank according to the present invention, it is possible to reduce the adhesion of the liquid to the semipermeable membrane.

1A and 1B are external perspective views of the multifunction device 10. FIG. 1A shows a state in which the cover 70 is in the closed position, and FIG. 1B shows a state in which the cover 70 is in the open position. FIG. 2 is a vertical sectional view schematically showing the internal structure of the printer unit 11. FIG. 3 is a plan view showing the arrangement of the carriage 23 and the tank set 99. FIG. 4 is a front perspective view of the ink tank 100. FIG. 5 is a rear perspective view of the ink tank 100. FIG. 6 is a right side view of the ink tank 100. FIG. 7 is a left side view of the ink tank 100. FIG. 8 is a front perspective view of the ink tank 100B. FIG. 9 is a rear perspective view of the ink tank 100B. FIG. 10 is a right side view of the ink tank 100B. FIG. 11 is a left side view of the ink tank 100B.

Hereinafter, embodiments of the present invention will be described. It is needless to say that the embodiments described below are merely examples of the present invention, and the embodiments of the present invention can be appropriately changed without changing the gist of the present invention. Further, in the following description, the direction from the start point to the end point of the arrow is expressed as the direction, and the traffic on the line connecting the start point and the end point of the arrow is expressed as the direction. In other words, orientation is a component of direction. Further, based on the posture in which the multifunction device 10 and the ink tank 100 installed in the multifunction device 10 are usably installed on a horizontal plane (the posture shown in FIG. 1 and may be referred to as "use posture"). The vertical direction 7 is defined, the front-rear direction 8 is defined with the surface of the multifunction device 10 where the opening 13 is provided as the front surface, and the left-right direction 9 is defined when the multifunction device 10 is viewed from the front surface. In the present embodiment, in the usage posture, the vertical direction 7 corresponds to the vertical direction, and the front-rear direction 8 and the horizontal direction 9 correspond to the horizontal direction.

[Overall configuration of multifunction device 10]
As shown in FIG. 1, the multifunction device 10 (an example of the device) has a substantially rectangular parallelepiped shape. The multifunction device 10 has a printer unit 11 at the bottom, which records an image on paper 12 (see FIG. 2) by an inkjet recording method. The printer unit 11 has a housing 14 having an opening 13 formed in the front wall 14A. As shown in FIG. 2, inside the housing 14, the feeding section 15, the feeding tray 20, the discharging tray 21, the transport roller section 54, the recording section 24, the discharging roller section 55, and the like, are included. A platen 42 and a tank set 99 are arranged. The multifunction device 10 has various functions such as a facsimile function and a print function.

[Feeding tray 20, discharge tray 21]
As shown in FIG. 1, the feed tray 20 is inserted and removed from the multifunction device 10 by the user along the front-rear direction 8 through the opening 13. The opening 13 is located on the front surface of the multifunction device 10 and at the center of the left-right direction 9. The feed tray 20 can support a plurality of stacked sheets 12. The discharge tray 21 is arranged above the feed tray 20 and is inserted and removed together with the feed tray 20. The discharge tray 21 supports the paper 12 discharged from between the recording unit 24 and the platen 42 by the discharge roller unit 55.

[Feeding unit 15]
The feeding unit 15 feeds the paper 12 supported by the feeding tray 20 to the transport path 65. As shown in FIG. 2, the feeding unit 15 includes a feeding roller 25, a feeding arm 26, and a shaft 27. The feeding roller 25 is rotatably supported by the tip of the feeding arm 26. The feed roller 25 rotates in the direction of transporting the paper 12 in the transport direction 16 due to the reversal of the transport motor (not shown). Hereinafter, the rotation of the feeding roller 25, the transport roller 60, and the discharge roller 62 in the direction of transporting the paper 12 in the transport direction 16 is referred to as “forward rotation”. The feeding arm 26 is rotatably supported by a shaft 27 supported by the frame of the printer unit 11. The feeding arm 26 is rotationally urged toward the feeding tray 20 by its own weight or an elastic force due to a spring or the like.

[Transport route 65]
As shown in FIG. 2, the transport path 65 refers to a space in which a part thereof is formed by the outer guide member 18 and the inner guide member 19 facing each other at predetermined intervals inside the printer unit 11. The transport path 65 is a path extending rearward from the rear end portion of the feed tray 20. The transport path 65 is a path that extends upward in the rear part of the printer unit 11 and makes a forward U-turn, passes through the space between the recording unit 24 and the platen 42, and reaches the discharge tray 21. As shown in FIGS. 2 and 3, the transport path 65 between the transport roller section 54 and the discharge roller section 55 is provided in the substantially central portion of the multifunction device 10 in the left-right direction 9, and is provided in the front-rear direction 8. It is extended. The transport direction 16 of the paper 12 in the transport path 65 is indicated by an arrow of the alternate long and short dash line in FIG.

[Conveying roller unit 54]
As shown in FIG. 2, the transport roller unit 54 is arranged upstream of the recording unit 24 in the transport direction 16. The transport roller unit 54 has a transport roller 60 and a pinch roller 61 facing each other. The transfer roller 60 is driven by a transfer motor. The pinch roller 61 rotates with the rotation of the transport roller 60. The paper 12 is sandwiched between the transport roller 60 and the pinch roller 61 that rotate forward by the forward rotation of the transport motor, and is transported in the transport direction 16.

[Discharge roller section 55]
As shown in FIG. 2, the discharge roller unit 55 is arranged downstream of the recording unit 24 in the transport direction 16. The discharge roller portion 55 has a discharge roller 62 and a spur 63 facing each other. The discharge roller 62 is driven by a transfer motor. The spur 63 rotates with the rotation of the discharge roller 62. The paper 12 is sandwiched between the discharge roller 62 and the spur 63 that rotate in the forward direction due to the normal rotation of the transfer motor, and is conveyed in the transfer direction 16.

[Recording unit 24]
As shown in FIG. 2, the recording unit 24 is arranged between the transport roller portion 54 and the discharge roller portion 55 in the transport direction 16. The recording unit 24 is arranged so as to face the platen 42 in the vertical direction 7 with the transport path 65 interposed therebetween. The recording unit 24 includes a carriage 23 and a recording head 39 (an example of a liquid consuming unit).

As shown in FIG. 3, the carriage 23 is supported by guide rails 43 and 44, each of which is extended in the left-right direction 9 at positions separated from each other in the front-rear direction 8. The guide rails 43 and 44 are supported by the frame of the printer unit 11. The carriage 23 is connected to a known belt mechanism provided on the guide rail 44. The belt mechanism is driven by a carriage motor (not shown). The carriage 23 connected to the belt mechanism reciprocates along the left-right direction 9 by driving the carriage motor. The range of movement of the carriage 23 extends to the right and left of the carrier path 65, as shown by the alternate long and short dash line in FIG.

An ink tube 32 and a flexible flat cable 33 extend from the carriage 23.

The ink tube 32 connects the tank set 99 and the recording head 39. The ink tube 32 is an ink (liquid) stored in four ink tanks 100B, 100Y, 100C, 100M (these may be collectively referred to as "ink tank 100") constituting the tank set 99. An example) is supplied to the recording head 39. The ink tank 100 is an example of a tank. In detail, four ink tubes 32B, 32Y, 32C, 32M (these are collectively referred to as "ink tube 32") in which inks of each color (black, magenta, cyan, yellow) are distributed may be referred to as "ink tube 32". ) Are extended from the ink tanks 100B, 100Y, 100C, and 100M, respectively, and are connected to the carriage 23 in a bundled state.

The flexible flat cable 33 electrically connects a control board on which a control unit (not shown) is mounted and a recording head 39. The flexible flat cable 33 transmits a control signal output from the control unit to the recording head 39.

As shown in FIG. 2, the carriage 23 is equipped with a recording head 39. A plurality of nozzles 40 are arranged on the lower surface of the recording head 39. The tips of the plurality of nozzles 40 are exposed from the lower surface of the recording head 39. Hereinafter, the surface on which the tip of the nozzle 40 is exposed may be referred to as a “nozzle surface”. The recording head 39 ejects ink from the nozzle 40 as minute ink droplets. In the process of moving the carriage 23, the recording head 39 ejects ink droplets toward the paper 12 supported by the platen 42. As a result, the image is recorded on the paper 12. This also consumes the ink stored in the ink tank.

The printer unit 11 includes a maintenance mechanism (not shown). The maintenance mechanism maintains the recording head 39. Specifically, the maintenance mechanism executes a purging operation for sucking ink and air in the nozzle 40 and an operation for removing foreign matter and the like adhering to the nozzle surface. The maintenance mechanism sends the ink sucked from the nozzle 40 of the recording head 39 to the waste ink tank (not shown) through a tube (not shown). The maintenance mechanism is arranged at a position directly below the carriage 23 located to the right or left of the transport path 65.

The carriage 23 moves directly above the maintenance mechanism before the purging operation is performed. After that, the cap (not shown) of the maintenance mechanism moves upward to cover the nozzle surface. The cap is connected to the waste ink tank via a tube. A rotary tube pump is placed on the tube. The tube is handled by driving the tube pump. As a result, the ink in the recording head 39 is sucked. The sucked ink is discharged to the waste ink tank through the cap and the tube.

The tube is in a state of being closed by a rotary type tube pump at at least one place.

[Platen 42]
As shown in FIGS. 2 and 3, the platen 42 is arranged between the transport roller portion 54 and the discharge roller portion 55 in the transport direction 16. The platen 42 is arranged so as to face the recording unit 24 in the vertical direction 7 with the transport path 65 interposed therebetween. The platen 42 supports the paper 12 conveyed by the conveying roller portion 54 from below.

[Tank set 99]
The tank set 99 stores ink supplied to the recording head 39. As shown in FIG. 1, the tank set 99 includes four ink tanks 100B, 100Y, 100C, and 100M. Ink of different colors is stored in each ink tank 100.
Specifically, black ink is stored in the ink tank 100B, yellow ink is stored in the ink tank 100Y, cyan ink is stored in the ink tank 100C, and magenta ink is stored in the ink tank 100M. However, the number of ink tanks 100 and the color of ink are not limited to the above examples.

The four ink tanks 100B, 100Y, 100C, and 100M are arranged side by side in a row along the left-right direction 9. Of the four ink tanks 100B, 100Y, 100C, and 100M, the ink tank 100B is arranged on the far right and the ink tank 100M is arranged on the far left. The arrangement position of the ink tank 100 is not limited to the above. The ink tank 100B has a larger size than the other ink tanks 100Y, 100C, and 100M, and particularly has a width in the left-right direction 9. The size relationship of the ink tank 100 is not limited to the above. The ink tank 100B has a larger allowable ink storage amount than the other ink tanks 100Y, 100C, and 100M. The magnitude relationship of the allowable storage amount of the ink tank 100 is not limited to the above.

As shown in FIG. 1, the tank set 99 is stationary inside the housing 14 in the right front portion of the housing 14. In other words, the tank set 99 is fixed to the multifunction device 10 so that it cannot be easily removed from the multifunction device 10. In addition, "cannot be easily removed" means, for example, that the user cannot easily remove the tank set 99 from the housing 14 of the multifunction device 10 under normal use conditions, and is skilled. The purpose is to exclude the case where the repairer removes the tank set 99 from the housing 14 of the multifunction device 10 for repair. Therefore, it suffices if the user cannot easily remove the tank set 99 from the housing 14 of the multifunction device 10 under normal use conditions.

The front surface of each ink tank 100 is exposed to the outside of the multifunction device 10 through an opening 22 formed in the right portion of the front wall 14A of the housing 14. The opening 22 is adjacent to the opening 13 in the left-right direction 9. The housing 14 is provided with a cover 70. The cover 70 is rotatable between a closed position that covers the opening 22 (the position shown in FIG. 1A) and an open position that exposes the opening 22 (the position shown in FIG. 1B). .. The cover 70 is supported by the housing 14 so as to be rotatable around the rotation axis 70A of the rotation axis (not shown) extending in the left-right direction 9 in the vicinity of the lower end of the vertical direction 7.

The configuration of the ink tank 100 will be described in detail below. Since the ink tanks 100Y, 100C, and 100M have the same configuration, one of the ink tanks 100Y, 100C, and 100M will be referred to as an ink tank 100, and the configuration will be described below. Further, since the configuration of the ink tank 100B is similar to the configuration of the ink tanks 100Y, 100C, 100M, the portion different from the ink tanks 100Y, 100C, 100M after the description of the configuration of the ink tanks 100Y, 100C, 100M. The configuration of the ink is described. In this case, even if the shapes of the ink tank 100B and the ink tanks 100Y, 100C, and 100M are slightly different, the same reference numerals are given to the configurations having the same functions. In the following description, unless otherwise specified, the multifunction device 10 and the ink tank 100 placed in the multifunction device 10 are in the usage posture.

[Ink tank 100]
As shown in FIGS. 4 and 5, the ink tank 100 is composed of a housing 140 that forms the outer shape of the ink tank. The housing 140 includes a frame 141 and two films 142 and 143.

As a whole, the frame 141 has a flat rectangular shape in which the dimensions along the left-right direction 9 are short and the dimensions along the vertical direction 7 and the front-rear direction 8 are longer than the dimensions along the left-right direction 9. Further, the dimension of the front-rear direction 8 is longer than the dimension of the vertical direction 7. That is, the ink tank 100 has a first side along the front-rear direction 8, a second side along the vertical direction 7 shorter than the first side, and a second side along the left-right direction 9 shorter than the second side. It has three sides.

The frame 141 is made of a resin having a translucency such that the ink in the ink chamber 111, which will be described later, can be visually recognized from the outside of the ink tank 100. The frame 141 is made of, for example, polypropylene. The frame 141 is integrally molded, for example, by injection molding a resin material. The rigidity of the frame 141 is higher than that of the films 142 and 143.

The frame 141 may be made of a material other than resin. Further, the frame 141 may have a configuration in which a plurality of members are combined. For example, the first ink chamber 131 and the second ink chamber 132, which will be described later, are each composed of two separate housings, and these two housings may be connected by a tube or the like.

The frame 141 includes a front wall 101, a left wall 103, an upper wall 104, a lower wall 105, a rear wall 110, and inner walls 69, 71 to 79, 151 to 155.

The front wall 101 is composed of a standing wall 102 and a sloping wall 106. The vertical wall 102 extends in the vertical direction 7 and the horizontal direction 9. The inclined wall 106 is a wall connecting the upper end of the vertical wall 102 and the front end of the upper wall 104, and is inclined with respect to the vertical direction 7 and the front-rear direction 8.

The left wall 103 is a wall extending rearward from the left end of the front wall 101. The upper end of the left wall 103 is connected to the front portion of the upper wall 104. The lower end of the left wall 103 is connected to the front portion of the lower wall 105. In other words, the left wall 103 is a wall connecting the left end of the front wall 101, the front left end of the upper wall 104, and the front left end of the lower wall 105. That is, the left wall 103 is provided only on the front portion of the frame 141, and is not provided on the rear portion of the frame 141.

The upper wall 104 extends rearward from the upper end of the front wall 101 (the rear end of the inclined wall 106). The front portion of the upper wall 104 is connected to the upper end of the left wall 103. A convex portion 144 protruding upward is formed from the substantially central portion to the rear portion of the upper wall 104 in the frame 141 in the front-rear direction 8. The convex portion 144 includes a front wall 144A projecting upward from the substantially central portion of the upper wall 104 in the front-rear direction 8, a rear wall 144B projecting upward from the rear portion of the upper wall 104, and an upper end and a rear wall 144B of the front wall 144A. It is provided with an upper wall 144C that connects to the upper end of the wall.

The lower wall 105 is a wall extending rearward from the lower end of the front wall 101. The lower wall 105 is formed apart from the upper wall 104 downward in the vertical direction 7. As mentioned above, the front portion of the lower wall 105 is connected to the lower end of the left wall 103. The left end of the lower wall 105 is bent upward. The upper end of the bent lower wall 105 is connected to the lower surface of the inner wall 72 described later (see FIG. 5).

The rear wall 110 is formed so as to be separated from the front wall 101 rearward in the front-rear direction 8. As described above, the upper end of the rear wall 110 is connected to the rear end of the upper wall 104. The lower end of the rear wall 110 is connected to the rear end of the lower wall 105. The left portion of the rear wall 110 is longer than the right portion of the rear wall 110 in the front-rear direction 8. An ink outflow path 114, which will be described later, is formed on the left side of the long rear wall 110.

As shown in FIGS. 6 and 7, the inner wall 71 extends downward from the upper wall 104 and the upper wall 144C of the convex portion 144. The inner wall 71 is a wall that extends in the vertical direction 7 and the front-rear direction 8. The inner wall 71 is provided in the hatch range shown in FIGS. 6 and 7. The inner wall 71 is provided at any position between the right end and the left end of the frame 141 in the left-right direction 9. For example, the inner wall 71 is provided in the substantially central portion of the frame 141 in the left-right direction 9. As a result, the inside of the frame 141 is divided into left and right at the place where the inner wall 71 is provided. Further, the inner wall 71 may be provided at a position close to the right end of the frame 141 or a position close to the left end of the frame 141 in the left-right direction 9. Since the inner wall 71 defines a part of the communication passage described later, it is desirable that the inner wall 71 is not included in the right end and the left end of the frame 141.

As shown in FIGS. 4 and 5, the inner wall 72 is provided in the vicinity of the lower wall 105 between the upper wall 104 and the lower wall 105 in the vertical direction 7. The inner wall 72 extends rearward while inclining upward from the front end portion to the rear end portion of the lower wall 105. The front end of the inner wall 72 is connected to a portion of the lower wall 105 on the front end side. The rear end of the inner wall 72 is in front of the rear wall 110 and away from the rear wall 110.

The inner wall 73 extends substantially upward from the rear end of the inner wall 72 in the vertical direction 7 while maintaining a constant distance from the rear wall 110. The inner wall 73 extends to the inside of the convex portion 144 while being bent along the outer shape of the convex portion 144. The upper end of the inner wall 73 is below the upper wall 1444C of the convex portion 144 and away from the upper wall 144C. A part of the inner wall 73 (a part below the inner wall 75 described later) is provided from the right end to the left end of the frame 141. On the other hand, other parts of the inner wall 73 are provided from the right end of the frame 141 to the inner wall 71.

The inner wall 69 extends in the vertical direction 7 and the front-rear direction 8. The inner wall 69 is located between the inner wall 72 and the inner wall 75, which will be described later, in the vertical direction 7. The inner wall 69 is located in front of the inner wall 73. The inner wall 69 is provided in the substantially central portion of the frame 141 in the left-right direction 9. As a result, the rear ink chamber 138 of the first ink chamber 131, which will be described later, is divided into left and right at the location where the inner wall 69 is provided. The lower end of the inner wall 69 is connected to the rear part of the inner wall 72. The upper end of the inner wall 69 is connected to the rear part of the inner wall 75. The rear end of the inner wall 69 is connected to the inner wall 73.

The inner walls 74 to 77 described below extend to the right from the inner wall 71 (see FIG. 6). In other words, the inner walls 74 to 77 are provided from the inner wall 71 to the right end of the frame 141.

As shown in FIGS. 4 and 6, the inner wall 74 extends downward at the front of the lower surface 104A of the upper wall 104. The left end of the inner wall 74 is connected to the left wall 103, and the rear surface of the inner wall 74 in the front-rear direction 8 is connected to the front end of the inner wall 71.

The inner wall 75 extends rearward from the lower end of the inner wall 74. The rear end of the inner wall 75 is connected to the inner wall 73.

The inner wall 76 extends forward from the upper end of the inner wall 73. That is, the inner wall 76 is located above the inner wall 75. The front end of the inner wall 76 is located behind the through hole 175 described later.

The inner wall 77 extends rearward from the lower end of the front wall 144A of the convex portion 144. The front portion of the inner wall 77 is located between the upper wall 144C of the convex portion 144 and the inner wall 75 in the vertical direction 7, and faces each of the upper wall 104 and the inner wall 75 in the vertical direction 7. The rear portion of the inner wall 77 is located between the inner wall 76 and the inner wall 75, and faces each of the inner wall 76 and the inner wall 75 in the vertical direction 7. The rear end of the inner wall 77 is in front of the inner wall 73 and away from the inner wall 73.

The inner walls 78 and 79 described below extend to the right and left from the inner wall 71 (see FIGS. 6 and 7). In other words, the inner walls 78 and 79 are provided from the right end to the left end of the frame 141.

As shown in FIGS. 4 and 5, the inner wall 78 extends in the vertical direction 7 and the horizontal direction 9. The inner wall 78 is provided behind the front wall 144A of the convex portion 144 apart from the front wall 144A. The inner wall 78 faces the inner wall 76 with the through hole 175 in the front-rear direction 8. That is, the inner wall 78 is provided between the front wall 144A and the through hole 175 in the front-rear direction 8.

The inner wall 79 extends in the vertical direction 7 and the horizontal direction 9. The inner wall 79 is located behind the inner wall 74 and in front of the inner wall 69. The upper end of the inner wall 79 is connected to the inner wall 75. The lower end of the inner wall 79 is connected to the inner wall 72. The left end of the inner wall 79 is connected to the left wall 103.

The inner walls 151 and 152 described below extend to the left from the inner wall 71 (see FIG. 7). In other words, the inner walls 151 and 152 are provided from the inner wall 71 to the left end of the frame 141.

As shown in FIGS. 5 and 7, the inner wall 151 is a wall connecting the lower end of the front wall 144A of the convex portion 144 and the rear portion of the upper wall 144C of the convex portion 144. The inner wall 151 extends rearward from the lower end of the anterior wall 144A, then upwards, then rearward, then upwards, and reaches the upper wall 144C.

The inner wall 152 is a wall connecting two points of the upper wall 144C of the convex portion 144. The two locations are the front end portion of the upper wall 144C and the central portion of the upper wall 144C in the front-rear direction 8. The inner wall 152 extends downward from the lower surface of the front end of the upper wall 144C, then backwards, then upwards, and reaches the lower surface of the central portion of the upper wall 144C in the anteroposterior direction 8. The inner wall 152 is surrounded by the upper wall 144C and the inner wall 151 in a side view of the ink tank 100 from the left.

As shown in FIG. 4, the right side of the frame 141 is open. Film 142 on the right side of the front wall 101, the lower wall 105, the rear wall 110, the upper wall 104, the inner walls 72 to 79, the front wall 144A of the convex portion 144, the rear wall 144B of the convex portion 144, and the upper wall 144C of the convex portion 144. Is welded to seal the right side of the frame 141.

As shown in FIG. 5, the rear part of the left side of the frame 141 is open. Of the rear wall 110, the upper wall 104, the inner wall 72, the inner wall 79, the inner wall 151, the inner wall 152, the front wall 144A of the convex portion 144, the rear wall 144B of the convex portion 144, the upper wall 144C of the convex portion 144, and the partition wall 186 described later. By welding the film 143 to the left surface, the left surface of the frame 141 is sealed.

As shown in FIG. 4, the outer surface (front surface) of the vertical wall 102 of the front wall 101 includes a first line 146 and a second line 147.

The first line 146 extends in the left-right direction 9. The position of the first line 146 in the vertical direction 7 is the position of the ink when the maximum amount of ink (an example of the first amount) that can be stored is stored in the ink chamber 111 in the usage posture of the multifunction device 10. It is at the same height as the liquid level. The position of the first line 146 in the vertical direction 7 is not limited to the same height as the liquid level of the ink when the maximum amount of ink is stored in the ink chamber 111.

The second line 147 extends in the left-right direction 9. The second line 147 is located below the first line 146. Specifically, the position of the second line 147 in the vertical direction 7 is the liquid level of the ink when the ink tank 100 is stored in the ink chamber 111 in an amount smaller than the maximum amount in the usage posture. It is the same height. In the present embodiment, the position 7 in the vertical direction of the second line 147 is the ink when the ink tank 100 is in the usage posture and the minimum amount of ink that needs to be replenished is stored in the ink chamber 111. It is the same height as the liquid level of.

[Ink chamber 111]
As shown in FIGS. 4 and 5, the housing 140 has an ink chamber 111 inside thereof. The ink chamber 111 is an internal space of the ink tank 100, and ink is stored in the ink chamber 111. The ink chamber 111 includes a first ink chamber 131 (an example of a first storage chamber) and a second ink chamber 132 (an example of a second storage chamber).

The first ink chamber 131 includes a space described below and a first communication passage 171 of an atmospheric communication passage that communicates with the space. The second ink chamber 132 includes a space described below, a second communication passage 172 of an atmospheric communication passage communicating with the space, a buffer chamber 148, and an ink outflow passage 114. The atmospheric communication passage, the buffer chamber 148, and the ink outflow passage 114 will be described later.

The first ink chamber 131 includes a front wall 101, a left wall 103, a lower wall 105, a rear wall 110, an inner wall 72, an inner wall 73, an inner wall 74, an inner wall 75, an upper wall 104, an inner wall 151, and an upper wall 144C of a convex portion 144. It is partitioned by film 142 and film 143. The front wall 101 partitions the front surface of the first ink chamber 131. The lower wall 105 and the inner wall 72 partition the lower surface of the first ink chamber 131. The inner wall 73 partitions the rear surface of the first ink chamber 131. The inner wall 75, the inner wall 74, and the upper wall 104 partition the upper surface of the first ink chamber 131. The film 142 partitions the right side of the first ink chamber 131. The left wall 103 and the film 143 partition the left surface of the first ink chamber 131.

The first ink chamber 131 is divided into a front ink chamber 137 and a rear ink chamber 138 by an inner wall 79. The front surface of the inner wall 79 partitions the rear surface of the front ink chamber 137. The rear surface of the inner wall 79 partitions the front surface of the rear ink chamber 138.

The upper end of the inner wall 79 is cut out from the right end to the left. As a result, an opening 135 is formed at the upper end of the inner wall 79. The opening 135 is partitioned by an inner wall 79, an inner wall 75, and a film 142. The lower end of the inner wall 79 is cut out from the right end to the left. As a result, an opening 136 is formed at the lower end of the inner wall 79. The opening 136 is partitioned by an inner wall 79, an inner wall 72, and a film 142. The front ink chamber 137 and the rear ink chamber 138 communicate with each other through openings 135 and 136.

As shown in FIGS. 4 and 6, the second ink chamber 132 is located below and behind the first ink chamber 131. The second ink chamber 132 has a substantially L-shape when viewed from the left side of the ink tank 100. The second ink chamber 132 includes a lower ink chamber 51 and an upper ink chamber 52. The lower ink chamber 51 is located below the first ink chamber 131. The upper ink chamber 52 extends upward from the rear end portion of the lower ink chamber 51. The upper ink chamber 52 is located behind the rear ink chamber 138 of the first ink chamber 131.

The lower ink chamber 51 is partitioned by a lower wall 105, an inner wall 72, and a film 142. The lower wall 105 partitions the front surface, the lower surface surface, and the left surface surface of the lower ink chamber 51. The inner wall 72 partitions the upper surface of the lower ink chamber 51. The film 142 partitions the right side of the lower ink chamber 51. The rear surface of the lower ink chamber 51 is open. On the rear surface, the lower ink chamber 51 communicates with the upper ink chamber 52.

The front end of the inner wall 72 is cut out from the right end to the left. As a result, an opening 145 (an example of a second communication port) is formed at the front end of the inner wall 72. The opening 145 is partitioned by an inner wall 72, a lower wall 105, and a film 142. The front ink chamber 137 of the first ink chamber 131 and the lower ink chamber 51 of the second ink chamber 132 communicate with each other by an opening 145.

The upper ink chamber 52 is partitioned by a rear wall 110, an inner wall 73, and a film 142. The rear wall 110 divides the rear surface and the left surface of the upper ink chamber 52. The inner wall 73 partitions the front surface of the upper ink chamber 52. The film 142 partitions the right side of the upper ink chamber 52. The lower surface of the upper ink chamber 52 is open. On the lower surface, the upper ink chamber 52 communicates with the lower ink chamber 51.

The upper surface of the upper ink chamber 52 is open. Here, the upper surface is a virtual surface and has the same height as the first line 146. That is, the upper surface thereof is at the same height as the liquid level of the ink when the maximum amount of ink that can be stored is stored in the ink chamber 111 in the usage posture of the ink tank 100. Then, on the upper surface, the upper ink chamber 52 communicates with the second communication passage 172 of the atmospheric communication passage, which will be described later. That is, the upper surface is the boundary between the upper ink chamber 52 and the second continuous passage 172. That is, the upper surface is the boundary position 188 (see FIG. 6) between the second ink chamber 132 and the second continuous passage 172. The boundary is not limited to the above-mentioned position, and may be, for example, above or below the first line 146.

In the usage posture of the ink tank 100, in other words, when the upper wall 104 constitutes the upper portion of the ink tank 100 and the lower wall 105 constitutes the lower portion of the ink tank 100, the maximum amount of ink that can be stored in the ink chamber 111 is allowed. When the ink is stored, the liquid level of the ink is the position shown by the broken line 191 in FIG. That is, the liquid level of the ink is at the same height as the first line 146, as described above.

At this time, the liquid level of the ink stored in the first ink chamber 131 and the liquid level of the ink stored in the second ink chamber 132 are the same in vertical height (height in the vertical direction 7).

Further, at this time, the liquid level of the ink in the first ink chamber 131 and the liquid level of the ink in the second ink chamber 132 are formed independently of each other. Specifically, the liquid surface of the ink in the first ink chamber 131 is surrounded by the front wall 101, the inner wall 73, the film 142, the left wall 103, and the film 143. On the other hand, the liquid surface of the ink in the second ink chamber 132 is surrounded by the rear wall 110, the inner wall 73, and the film 142.

The liquid level of the ink in the first ink chamber 131 and the liquid level of the ink in the second ink chamber 132 are formed independently of each other because the maximum amount of ink that can be stored in the ink chamber 111 is allowed. Not only when the ink is stored. For example, the liquid level of the ink in the first ink chamber 131 and the liquid level of the ink in the second ink chamber 132 are formed independently of each other because the liquid level of the ink stored in the ink chamber 111 is the first. It may be when the amount of ink is stored when the height is the same as that of the two lines 147. Of course, when the maximum amount of ink that can be stored is stored in the ink chamber 111, the amount of ink when the liquid level of the ink stored in the ink chamber 111 is the same as that of the second line 147. When the ink is stored and / or when other amounts of ink are stored, the liquid level of the ink in the first ink chamber 131 and the liquid level of the ink in the second ink chamber 132 are mutual to each other. It may be formed independently.

Further, even when the ink tank 100 is not in the usage posture, the liquid level of the ink in the first ink chamber 131 and the liquid level of the ink in the second ink chamber 132 are formed independently of each other.

For example, when the lower wall 105 constitutes the upper portion of the ink tank 100 and the upper wall 104 constitutes the lower portion of the ink tank 100, and the ink chamber 111 stores the maximum amount of ink that can be stored. The liquid level of the ink is the position shown by the broken line 192 in FIG. That is, in the vertical direction 7, it is the position of the broken line 192 shown between the first line 146 and the second line 147.

Further, for example, in a state where the front wall 101 constitutes the upper portion of the ink tank 100 and the rear wall 110 constitutes the lower portion of the ink tank 100, the maximum amount of ink that can be stored is stored in the ink chamber 111. At that time, the liquid level of the ink is the position shown by the alternate long and short dash line 193 in FIG.

Further, for example, in a state where the rear wall 110 constitutes the upper portion of the ink tank 100 and the front wall 101 constitutes the lower portion of the ink tank 100, the maximum amount of ink that can be stored is stored in the ink chamber 111. At that time, the liquid level of the ink is the position shown by the two-dot chain line 194 in FIG.

[Buffer room 148]
As shown in FIGS. 4 and 6, the housing 140 has a buffer chamber 148 inside thereof. The buffer chamber 148 is an internal space of the ink tank 100, and is interposed between the second ink chamber 132 and the ink outflow passage 114 described later. That is, the ink stored in the second ink chamber 132 flows into the ink outflow path 114 via the buffer chamber 148.

The buffer chamber 148 is provided in the lower right rear portion of the housing 140. The buffer chamber 148 is partitioned by an inner wall 153, an inner wall 154, an inner wall 155, a lower wall 105, a rear wall 110, and a film 142.

The inner wall 153 projects forward from the front surface at the lower right portion of the rear wall 110 and extends in the left-right direction 9. The inner wall 153 partitions the upper surface of the buffer chamber 148. The inner wall 154 projects upward from the upper surface of the lower right rear portion of the lower wall 105 and extends in the left-right direction 9. The inner wall 154 partitions the front surface of the buffer chamber 148. The inner wall 155 is a wall extending in the vertical direction 7 and the front-rear direction 8, and is surrounded by the inner wall 153, the inner wall 154, the rear wall 110, and the lower wall 105. The inner wall 155 partitions the left side of the buffer chamber 148. The lower wall 105 partitions the lower surface of the buffer chamber 148. The rear wall 110 partitions the rear surface of the buffer chamber 148. The film 142 partitions the right side of the buffer chamber 148.

The lower right end of the inner wall 154 is cut out from the right end to the left. As a result, an opening 149 (an example of a liquid outlet) is formed at the lower right end of the inner wall 154. The opening 149 is partitioned by an inner wall 154 and a film 142. The opening 149 communicates the lower right rear portion of the second ink chamber 132 with the buffer chamber 148. In the present embodiment, the inner wall 154 is cut out in a semicircular shape, but the shape of the cutout is not limited to the semicircular shape and may be, for example, a rectangular shape.

A circular opening 150 is formed in the central portion of the inner wall 155. The opening 150 communicates the buffer chamber 148 with the ink outflow path 114. The ink stored in the second ink chamber 132 flows into the opening 150 via the buffer chamber 148. In other words, the opening 150 is an ink inlet (an example of a liquid inlet) for flowing ink from the buffer chamber 148 into the ink outflow passage 114. The shape of the opening 150 is not limited to a circular shape, and may be, for example, a rectangular shape.

[Ink outflow path 114]
As shown in FIGS. 5 and 7, the housing 140 has an ink outflow path 114. The ink outflow path 114 is a continuous passage for discharging the ink stored in the second ink chamber 132 to the outside of the ink tank 100. In the present embodiment, the ink stored in the first ink chamber 131 moves to the second ink chamber 132 through the opening 145, so that the ink outflow path 114 is the first ink chamber 131 and the second ink. It can be said that it is a continuous passage for discharging the ink stored in the chamber 132 to the outside of the ink tank 100.

The ink outflow path 114 communicates with the buffer chamber 148 through the opening 150. The ink outflow path 114 extends from the opening 150 to the left, then upwards, then downwards, then to the right, and reaches the opening 156.

The ink outflow path 114 is formed as a groove recessed from the left surface of the rear wall 110 to the right. A part of the right side surface and the part excluding the left side surface of the ink outflow path 114 are partitioned by the rear wall 110. The peripheral portion of the opening 156 on the right side of the ink outflow path 114 is partitioned by an inner wall 155. The left side of the ink outflow path 114 is partitioned by the film 143.

The frame 141 includes a cylindrical protrusion 157. The protrusion 157 projects rearward from the peripheral portion of the opening 156 of the rear wall 110. The front end of the internal space of the protrusion 157 communicates with the ink outflow path 114 by an opening 156. The rear end of the internal space of the protrusion 157 communicates with the outside of the ink tank 100 by an opening 158. The ink tube 32 is connected to the protrusion 157 through the opening 158.

From the above, one end of the ink outflow path 114 communicates with the second ink chamber 132 through the buffer chamber 148. Further, the other end of the ink outflow path 114 communicates with the nozzle 40 of the recording head 39 through the internal space of the protrusion 157 and the ink tube 32. That is, the opening 158 causes the ink flowing in from the opening 150 to flow out toward the recording head 39. Further, the ink in the ink outflow path 114 can move toward the recording head 39 when the ink is consumed by ejecting ink droplets from the recording head 39.

Here, the ink outflow path 114 is a flow path. The flow path is a space in which one end is connected to the ink chamber 111 and the ink stored in the ink chamber 111 does not flow in when the other end is closed regardless of the posture of the ink tank 100. .. In the present embodiment, the ink tank 100 includes only the ink outflow path 114 as the flow path, but may include a flow path other than the ink outflow path 114.

It will be described in detail below. As described above, the tube extending from the cap of the maintenance mechanism capable of covering the nozzle 40 of the recording head 39 is closed by the pump. Therefore, when the nozzle 40 is covered with the cap, the other end of the ink outflow path 114 (the end near the protrusion 157) is closed through the internal space of the protrusion 157, the ink tube 32, the recording head 39, and the cap. It communicates with the inked tube. That is, the other end of the ink outflow path 114 is blocked. The cross-sectional area of the ink outflow path 114 is sufficiently smaller than the cross-sectional area of the second ink chamber 132. Therefore, even if the ink tank 100 is changed to a posture other than the used posture, that is, the ink stored in the second ink chamber 132 does not flow into the ink outflow path 114 regardless of the posture of the ink tank 100. When the nozzle 40 is not covered with the cap, the nozzle 40 is open. That is, the other end of the ink outflow path 114 is open. Therefore, the ink stored in the second ink chamber 132 can flow into the ink outflow path 114.

On the other hand, the opening 145 described above and the atmospheric communication passage described later are boundaries. The boundary is a space in which at least one of one end or the other end is connected to the ink chamber 111, and even if one end or the other end is closed, the ink stored in the ink chamber 111 can flow into the space. Space. In the present embodiment, the ink tank 100 has only the opening 145 and the atmospheric communication passage as a boundary, but may have a boundary other than the opening 145 and the atmospheric communication passage.

[Atmospheric passage]
As shown in FIGS. 4 to 7, the housing 140 has an atmospheric communication passage. The atmospheric communication passage is a communication passage for communicating the ink chamber 111 and the outside of the ink tank 100. In other words, the atmospheric communication passage is a communication passage for opening the ink chamber 111 to the atmosphere. The atmospheric passage includes the first passage 171 and the second passage 172 shown in FIGS. 4 and 6, and the third passage 173 shown in FIGS. 4 to 7. The first passage 171 and the second passage 172 are located to the right of the inner wall 71. The third passage 173 is located on both the right side and the left side of the inner wall 71.

As shown in FIGS. 4 and 6, the first communication passage 171 communicates with the front ink chamber 137 of the first storage chamber 131 through an opening 174 (an example of the first communication port). The opening 174 is formed by cutting out the right front end portion of the inner wall 75 from the right end to the left. The opening 174 is partitioned by an inner wall 75, an inner wall 74, and a film 142.

The first communication passage 171 extends rearward from the opening 174 and then forwards so as to make a U-turn, leading to a through hole 175 (an example of a third communication port, see FIGS. 6 and 7). The through hole 175 is provided in the inner wall 71. The through hole 175 is provided slightly in front of the center of the convex portion 144 in the front-rear direction 8 in the front-rear direction 8. The through hole 175 communicates the right side of the inner wall 71 and the left side of the inner wall 71.

As will be described later, the second passage 172 also reaches the through hole 175. Therefore, the first communication passage 171 communicates with the first ink chamber 131 at one end and communicates with the second communication passage 172 at the other end.

The first continuous passage 171 is divided into front and rear and upper and lower surfaces by an upper wall 104, an inner wall 73, an inner wall 74, an inner wall 75, an inner wall 76, and an inner wall 77. Further, the first continuous passage 171 is partitioned by an inner wall 71 on the left surface and by a film 142 on the right surface.

The second communication passage 172 communicates with the upper surface (virtual surface) of the upper ink chamber 52 of the second ink chamber 132 at the lower end thereof. The second communication passage 172 extends upward from the communication position with the upper ink chamber 52, then extends forward, then extends upward, and then extends forward, reaching the through hole 175.

As described above, the other end of the first communication passage 171 also reaches the through hole 175. Therefore, the second communication passage 172 communicates with the second ink chamber 132 at one end and communicates with the other end of the first communication passage 171 at the other end.

The second continuous passage 172 is divided into a rear surface and an upper surface by a rear wall 110, an upper wall 104, a rear wall 144B of the convex portion 144, and an upper wall 144C of the convex portion 144. Further, the front surface and the lower surface of the second continuous passage 172 are partitioned by the inner wall 73 and the inner wall 76. The left side of the second passage 172 is partitioned by the inner wall 71, and the right surface is partitioned by the film 142.

The through hole 175 is opened to the right and to the left. As shown in FIG. 6, the opened right side of the through hole 175 communicates with the other end of the first communication passage 171 and the other end of the second communication passage 172. As shown in FIG. 7, the left side of the through hole 175 is communicated with the left communication passage 176 of the third communication passage 173 described below. That is, the through hole 175 allows ink to pass from the other end of the first communication passage 171 and the other end of the second communication passage 172 to the third communication passage 173 along the left-right direction 9 (an example of the first direction). ..

As shown in FIGS. 5 and 7, the third passage 173 includes a left passage 176, a right passage 177 (an example of a flow passage), a rear passage 178, and a labyrinth 179 (labyrinth passage). One example) and.

The left passage 176 extends to the left from the through hole 175 (see FIGS. 6 and 7) to the left end of the frame 141. The left communication passage 176 communicates with the first communication passage 171 and the second communication passage 172 through the through hole 175. The left communication passage 176 communicates with the right communication passage 177 through the opening 180. The opening 180 is formed by cutting out the left lower end portion of the inner wall 78 from the left end to the right. The opening 180 is partitioned by an inner wall 78, an inner wall 152, and a film 143.

The front surface of the left passage 176 is partitioned by the inner wall 78, the rear surface and the lower surface are partitioned by the inner wall 152, the upper surface is partitioned by the upper wall 144C of the convex portion 144, and the left surface is partitioned by the film 143. Has been done.

The right passage 177 extends to the right from the opening 180 to the right end of the frame 141. The right side passage 177 extends along the left-right direction 9. As shown in FIGS. 4, 6 and 7, an opening 181 is formed in the portion of the inner wall 71 where the right passage 177 is formed. The left side of the inner wall 71 and the right side of the inner wall 71 in the right communication passage 177 are communicated with each other by an opening 181.

As shown in FIG. 4, the surrounding wall 182 projects to the right from the peripheral edge of the opening 181 in the inner wall 71. A semipermeable membrane 183 (see FIG. 4) is attached to the protruding tip surface of the surrounding wall 182, that is, the right surface of the surrounding wall 182. As a result, the right passage 177 is blocked by the semipermeable membrane 183.

The semipermeable membrane 183 is a porous membrane having minute pores that block the passage of ink and allow the passage of gas. For example, the transpermeable film 183 is made of polytetrafluoroethylene, polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, or tetrafluoroethylene-ethylene copolymer. It consists of fluororesin such as.

The lower inner surface 182A (an example of an adjacent surface) of the surrounding wall 182 is adjacent to the semipermeable membrane 183 on the left side of the semipermeable membrane 183. That is, the lower inner surface 182A is adjacent to the semipermeable membrane 183 closer to the second passage 172 than the semipermeable membrane 183. The lower inner surface 182A partitions a part of the lower end of the right side passage 177. The lower inner surface 182A is inclined so that the right end is located above the left end. Here, the right end of the lower inner surface 182A is closer to the semipermeable membrane 183 than the left end of the lower inner surface 182A. Therefore, the lower inner surface 182A is inclined with respect to the left-right direction 9 so that the portion close to the semipermeable membrane 183 is above the portion away from the semipermeable membrane 183.

The semipermeable membrane 183 shown in FIG. 4 is attached to the surrounding wall 182. As shown in FIG. 6, the surrounding wall 182 is located in front of the through hole 175. That is, the semipermeable membrane 183 is provided at a position different from the through hole 175 in the front-rear direction 8 (an example of the second direction).

As shown in FIGS. 5 and 7, the left side of the inner wall 71 of the right side passage 177 is divided into the front surface and the lower surface by the inner wall 152, and the rear surface is divided by the inner wall 78, and the convex portion 144. The upper surface is partitioned by the upper wall 144C, the portion excluding the opening 181 on the right surface is partitioned by the inner wall 71 (see FIG. 6), and the left surface is partitioned by the film 143.

Further, as shown in FIGS. 4 and 6, the front surface of the right side of the inner wall 71 of the right side passage 177 is partitioned by the front wall 144A of the convex portion 144, and the lower inner surface of the inner wall 77 and the surrounding wall 182. The lower surface is partitioned by 182A, the rear surface is partitioned by the inner wall 78, the upper surface is partitioned by the upper wall 144C of the convex portion 144, and the portion excluding the opening 181 on the left surface is partitioned by the inner wall 71. , The right side is partitioned by the film 142.

As shown in FIGS. 5 and 7, the rear communication passage 178 is a right communication passage through an opening 184 (see FIGS. 6 and 7) formed between the front wall 144A and the inner wall 71 of the convex portion 144. It communicates with the right part of the inner wall 71 in 177. The rear passage 178 extends leftward from the opening 184 and then rearwardly to reach the labyrinth 179 through the opening 185 formed between the inner wall 151 and the inner wall 152.

The lower surface and the front surface of the rear passage 178 are partitioned by the inner wall 151 and the front wall 144A of the convex portion 144, the rear surface and the upper surface are partitioned by the inner wall 152, and the right surface is partitioned by the inner wall 71. The left side is partitioned by.

The labyrinth 179 is a continuous passage extending along the front-rear direction 8 while repeating U-turns in the up-down direction 7 by providing a plurality of partition walls 186 extending in the vertical direction 7 side by side in the front-rear direction 8. One end (front and lower ends) of the labyrinth 179 communicates with the rear communication passage 178 through the opening 185. The other end (rear upper end) of the labyrinth 179 communicates with the atmosphere opening 187 (see FIG. 5). The labyrinth 179 is provided between the semipermeable membrane 183 and the atmospheric opening 187.

The atmosphere opening 187 is configured as a hole that penetrates the upper wall 144C of the convex portion 144 in the vertical direction 7. The lower end of the atmosphere opening 187 communicates with the labyrinth 179. The upper end of the atmosphere opening 187 communicates with the outside of the ink tank 100. The atmosphere opening port 187 is located above the liquid level of the ink when the maximum amount of ink that can be stored is stored in the ink chamber 111 in the usage posture of the ink tank 100.

From the above, the third communication passage 173 communicates with the other end of the first communication passage 171 and the other end of the second communication passage 172 through the through hole 175 at one end, and the atmosphere opening 187 at the other end. It communicates with the outside of the ink tank 100 through.

From the above, as shown in FIG. 4, the atmospheric communication passage communicates with the first ink chamber 131 of the ink chamber 111 at the opening 174, and the second ink of the ink chamber 111 at the lower end of the second communication passage 172. It communicates with room 132. On the other hand, as shown in FIG. 5, the atmospheric communication passage communicates with the outside of the ink tank 100 at the atmospheric opening port 187.

[Ink tank 100B]
Hereinafter, the configuration of the ink tank 100B will be described with reference to FIGS. 8 to 11. As shown in FIGS. 8 and 9, the ink tank 100B is longer in the left-right direction 9 than the ink tanks 100Y, 100C, and 100M (see FIGS. 4 and 5).

Hereinafter, the ink tank 100B will be described with respect to parts different from the ink tanks 100Y, 100C, and 100M. The parts of the ink tank 100B having the same configuration as the ink tanks 100Y, 100C, and 100M are designated by the same reference numerals as those in FIGS. 4 to 7, and the description thereof will be omitted. Further, the difference between the configuration of the predetermined portion in the ink tank 100B and the configuration of the portion corresponding to the predetermined portion of the ink tanks 100Y, 100C, 100M is that the configuration of the predetermined portion in the ink tank 100B is 9 in the left-right direction. In the case of only the point of being long, the portion corresponding to the predetermined portion in the ink tank 100B is designated with the same reference numerals as those in FIGS. 4 to 7, and the description thereof is omitted.

As shown in FIGS. 8 and 9, the housing 140 of the ink tank 100B includes a frame 141 and three films 139, 142, 143.

As shown in FIGS. 8 and 10, the ink tank 100B does not have the left wall 103 (see FIG. 5) that the ink tanks 100Y, 100C, 100M have, but has a right wall 159. The right wall 159 is a wall extending rearward from the right end of the front wall 101. The upper end of the right wall 159 is connected to the front portion of the upper wall 104. The lower end of the right wall 159 is connected to the front portion of the lower wall 105. In other words, the right wall 159 is a wall connecting the right end of the front wall 101, the front right end of the upper wall 104, and the front right end of the lower wall 105. That is, the right wall 159 is provided only in the front portion of the frame 141, and is not provided in the rear portion of the frame 141.

As shown in FIGS. 8 and 9, a recess 162 is formed in the front portion of the upper wall 104. The recess 162 is partitioned by the side walls 162A, 162B, 162C and the upper wall 104.

The ink tank 100B does not have an inner wall 71 (see FIG. 6). The ink tank 100B includes an inner wall 160 (see FIGS. 8 and 10) and an inner wall 161 (see FIGS. 9 and 11) as walls corresponding to the inner wall 71 (see FIG. 6).

The inner wall 160 and the inner wall 161 extend downward from the upper wall 104 and the upper wall 144C of the convex portion 144. The inner wall 160 and the inner wall 161 are walls extending in the vertical direction 7 and the front-rear direction 8.

The inner wall 160 is provided in the hatch range shown in FIG. The inner wall 160 is provided at any position between the right end and the left end of the frame 141 in the left-right direction 9. For example, the inner wall 160 is provided on the right side of the center of the frame 141 in the left-right direction 9.

The inner wall 161 is provided in the hatch range shown in FIG. The inner wall 161 is provided at any position between the right end and the left end of the frame 141 and to the left of the inner wall 160 in the left-right direction 9. For example, the inner wall 161 is provided on the left side of the center of the frame 141 in the left-right direction 9.

As shown in FIGS. 8 and 10, the portion of the inner wall 73 above the inner wall 75, the portion of the inner wall 75 closer to the inner wall 73, the inner wall 76, and the inner wall 77 extend to the right from the inner wall 160. That is, the portion above the inner wall 75 of the inner wall 73, the portion of the inner wall 75 closer to the inner wall 73, the inner wall 76, and the inner wall 77 are provided on the right side of the inner wall 160.

As shown in FIGS. 9 and 11, the inner wall 74 and the portion of the inner wall 75 closer to the inner wall 74 extend to the left from the side wall 162A. That is, the inner wall 74 and the portion of the inner wall 75 near the inner wall 74 are provided on the left side of the side wall 162A.

As shown in FIGS. 9 and 11, the inner wall 74 extends downward from the left front portion of the upper wall 104. The inner wall 74 is not connected to the inner wall 160 and the inner wall 161 but is connected to the side wall 162A.

The inner wall 75 extends rearward from the lower end of the inner wall 74. In this rearward extending portion, the inner wall 75 extends to the left from the side wall 162A. The inner wall 75 then extends to the right. In this portion extending to the right, the inner wall 75 has a front end connected to the side wall 162B (see FIG. 8) and a rear end connected to the front wall 144A (see FIGS. 8 and 11) of the convex portion 144. The inner wall 75 then extends rearward, as shown in FIGS. 8 and 10. In this rearward extending portion, the inner wall 75 extends to the right from the inner wall 160.

The right end of the inner wall 79 is connected to the right wall 159.

The inner wall 151 is a wall connecting the lower end of the front wall 144A of the convex portion 144 and the rear wall 144B of the convex portion 144. The inner wall 151 extends posteriorly from the lower end of the anterior wall 144A, then upwards, then posteriorly, then upwards, then posteriorly, and reaches the posterior wall 144B.

As shown in FIG. 8, the rear part of the right side of the frame 141 is open. Lower wall 105, rear wall 110, upper wall 104, inner wall 72, 73, 75-79, side wall 162B of concave portion 162, front wall 144A of convex portion 144, rear wall 144B of convex portion 144, and upper wall of convex portion 144. By welding the film 142 to the right surface of 144C, the right surface of the frame 141 is sealed.

As shown in FIG. 9, the left side of the frame 141 is open. Rear wall 110, upper wall 104, lower wall 105, inner wall 72, inner wall 74, inner wall 75, inner wall 78, inner wall 79, inner wall 151, inner wall 152, front wall 144A of convex portion 144, rear wall 144B of convex portion 144, convex The left surface of the frame 141 is sealed by welding the film 143 to the upper wall 144C of the portion 144 and the left surface of the partition wall 186.

As shown in FIGS. 8 and 9, the first ink chamber 131 has a front wall 101, a right wall 159, a lower wall 105, a rear wall 110, an inner wall 72, an inner wall 73, an inner wall 74, an inner wall 75, and an upper wall 104. It is partitioned by an inner wall 151, a film 142, and a film 143. The right wall 159 and the film 142 partition the right side of the first ink chamber 131.

As shown in FIG. 9, the upper end portion of the inner wall 79 is cut out from the left end to the right. As a result, an opening 163 is formed at the upper end of the inner wall 79. The opening 163 is partitioned by an inner wall 79, an inner wall 75, and a film 143. The lower end of the inner wall 79 is cut out from the left end to the right. As a result, an opening 164 is formed at the lower end of the inner wall 79. The opening 164 is partitioned by an inner wall 79, an inner wall 72, and a film 143. The front ink chamber 137 and the rear ink chamber 138 communicate with each other through openings 163 and 164.

The front end of the inner wall 72 is cut out from the left end to the right. As a result, an opening 165 is formed at the front end of the inner wall 72. The opening 165 is partitioned by an inner wall 72, a lower wall 105, and a film 143. The front ink chamber 137 of the first ink chamber 131 and the lower ink chamber 51 of the second ink chamber 132 communicate with each other by an opening 165.

As shown in FIGS. 8 and 10, the first passage 171 and the second passage 172 are located to the right of the inner wall 160. As shown in FIGS. 8 to 11, the third passage 173 is located on both the right side of the inner wall 160 and the left side of the inner wall 161.

As shown in FIG. 9, the first communication passage 171 communicates with the front ink chamber 137 of the first storage chamber 131 through the opening 166. The opening 166 is formed by cutting out the left front end portion of the inner wall 75 from the left end to the right. The opening 166 is partitioned by an inner wall 75, an inner wall 74, and a film 143.

The first passage 171 extends rearward from the opening 166 and then extends to the right. Then, as shown in FIG. 8, the first passage 171 extends rearward, then forward so as to make a U-turn, and reaches the through hole 175 (see FIG. 10). The through hole 175 is a hole that penetrates the inner wall 160 and the inner wall 161 in the left-right direction 9, and connects the first continuous passage 171 and the second continuous passage 172 and the third continuous passage 173.

As shown in FIG. 9, a portion of the first passage 171 extending rearward from the opening 166 is partitioned by an upper wall 104, a side wall 162A of the recess 162, an inner wall 74, an inner wall 75, and a film 143. The portion extending to the right in the first continuous passage 171 is partitioned by the upper wall 104, the side wall 162B of the recess 162, the inner wall 75, and the front wall 144A of the convex portion 144. As shown in FIG. 8, the portion to the right of the inner wall 71 in the first continuous passage 171 is partitioned by the inner wall 71, the inner wall 73, the inner wall 75, the inner wall 76, the inner wall 77, and the film 142.

As shown in FIG. 9, the frame 141 includes a protrusion 167 projecting rearward from the rear wall 110. The protrusion 167 detects the height of the liquid level of the ink stored in the ink chamber 111 of the ink tank 100 in the usage posture by irradiating the optical sensor 98 described later with light. The protrusion 167 has a rectangular parallelepiped shape. The protrusion 167 has an internal space 167A, and the front end and the rear end of the protrusion 167 are open. The front end of the internal space 167A of the protrusion 167 communicates with the upper ink chamber 52 of the second ink chamber 132. That is, the internal space 167A is provided in the second ink chamber 132. The rear end of the protrusion 167 is open. The rear end of the opened protrusion 167 is closed by affixing the film 139.

In the horizontal cross section of the ink tank 100 having a height below the upper end and above the lower end of the internal space 167A of the protrusion 167, the cross-sectional area of the second ink chamber 132 when the horizontal cross section is viewed from above is above the horizontal cross section. It is smaller than the cross-sectional area of the first ink chamber 131 when viewed from above. The internal space 167A of the protruding portion 167 communicates with the second ink chamber 132 having a small cross-sectional area.

In the present embodiment, the internal space 167A of the protrusion 167 communicates with the second ink chamber 132, but the internal space 167A may communicate with the first ink chamber 131. That is, the internal space 167A may be provided in the first ink chamber 131. In this case, the protruding portion 167 may protrude from, for example, the front wall 101 or the left wall 103.

Further, in the present embodiment, the protruding portion 167 is provided only in the ink tank 100B among the ink tanks 100B, 100Y, 100C, and 100M. However, the protrusion 167 may be provided in at least one of the ink tanks 100B, 100Y, 100C, and 100M.

[Optical sensor 98]
The printer unit 11 includes an optical sensor 98. The optical sensor 98 is attached to the housing 14. As shown by the broken line in FIG. 9, the optical sensor 98 is located to the right and left of the protrusion 167 of the frame 141 of the ink tank 100B in a state where the tank set 99 is stationary inside the housing 14. ing.

The optical sensor 98 includes a light emitting unit 98A and a light receiving unit 98B. The light emitting portion 98A and the light receiving portion 98B are arranged so as to sandwich the protruding portion 167 in the left-right direction 9. The light emitting portion 98A is located to the right of the protruding portion 167. The light receiving portion 98B is located to the left of the protruding portion 167. The positions of the light emitting unit 98A and the light receiving unit 98B may be reversed left and right.

The light emitting unit 98A and the light receiving unit 98B so that the light irradiation position of the light receiving unit 98B in the light emitting unit 98A and the light receiving position of the light from the light emitting unit 98A in the light receiving unit 98B are at the height of the second line 147 or less. The arrangement position of 7 in the vertical direction is determined. In this embodiment, as shown in FIG. 10, the optical sensor 98 is located below the second line 147. That is, the height of the position corresponding to the optical path of the light emitted from the optical sensor 98 in the protrusion 167 is lower than the broken line shown in FIG. Here, the broken line indicates the liquid level of the ink, which is the minimum amount of ink that needs to be replenished in the ink tank in the usage posture. From the above, the position of the protrusion 167 in the vertical direction 7 includes the position below the second line 147.

The optical sensor 98 is electrically connected to a control unit (not shown) of the multifunction device 10 via an electric circuit.

Light is emitted from the light emitting unit 98A toward the light receiving unit 98B. The irradiated light passes through the protrusion 167 and enters the internal space 167A of the protrusion 167. When the liquid level of the ink stored in the internal space 167A is above the optical path, the light is blocked by the ink stored in the internal space 167A and does not reach the light receiving unit 98B. As a result, a low-level signal is output from the optical sensor 98 to the control unit. On the other hand, when the liquid level of the ink is below the optical path, the light travels in the air in the internal space 167A. In this case, the light passes through the internal space 167A and reaches the light receiving unit 98B. As a result, a high-level signal is output from the optical sensor 98 to the control unit.

The control unit determines that the liquid level of the ink stored in the ink chamber 111 is higher than that of the second line 147 when the signal from the optical sensor 98 is at a low level, and the signal from the optical sensor 98 is at a high level. In a certain case, it is determined that the liquid level of the ink stored in the ink chamber 111 is lower than that of the second line 147.

[Injection port 112]
As shown in FIG. 1B, each of the inclined walls 106 of the ink tanks 100B, 100Y, 100C, and 100M has an injection port 112B for injecting ink into the first ink chamber 131 of the ink chamber 111. 112Y, 112C, 112M (these may be collectively referred to as "inlet port 112") are provided. The injection port 112 (an example of the liquid injection port) penetrates the inclined wall 106 in the thickness direction and communicates the corresponding first ink chamber 131 with the outside of the ink tank 100. The inner surface of the inclined wall 106 faces the front ink chamber 137 of the first ink chamber 131. The outer surface of the inclined wall 106 faces the outside of the ink tank 100. Therefore, the injection port 112 directly communicates the first ink chamber 131 with the outside of the ink tank 100. That is, in the present embodiment, the injection port 112 is provided in the first ink chamber 131 of the first ink chamber 131 and the second ink chamber 132, whichever is not provided with the protruding portion 167. The injection port 112 may be for injecting ink into the second ink chamber 132.

The injection port 112 provided in the inclined wall 106 and the inclined wall 106 is exposed to the outside of the multifunction device 10 through the opening 22 by locating the cover 70 in the open position. The posture (injection posture) of the ink tank 100 when ink is injected into the first ink chamber 131 through the injection port 112 is a usage posture. That is, when the ink tank 100 is in the use posture, ink is injected into the first ink chamber 131 through the injection port 112.

[Cap 113]
As shown in FIG. 1, the ink tank 100 has caps 113B, 113Y, 113C, 113M that can be attached to and detached from the inclined wall 106 so as to close the injection port 112. The cap 113 has four caps 113B, 113Y, 113C, 113M corresponding to the four injection ports 112B, 112Y, 112C, 112M of the ink tank 100. As shown in FIG. 1 (A), the cap 113 attached to the inclined wall 106 is in close contact with the wall surface defining the peripheral edge of the injection port 112 to close the injection port 112. On the other hand, as shown in FIG. 1 (B), the cap 113 removed from the inclined wall 106 opens the injection port 112. The cap 113 is attached to and detached from the inclined wall 106 with the cover 70 in the open position. Further, by removing the cap 113 from the injection port 112, ink can be injected into the ink chamber 111 through the injection port 112.

[Cover 70]
As shown in FIG. 1, the cover 70 is provided with an opening 22 formed in the front wall 14A of the housing 14 so as to be openable and closable. The cover 70 rotates around a rotation shaft 70A extending along the left-right direction 9. The cover 70 has an outer shape corresponding to the opening 22 and has a box shape that opens toward the opening 22. The cover 70 covers the vertical wall 102 and the inclined wall 106 of the front wall 101 of the ink tank 100 in the closed position. The cover 70 exposes the vertical wall 102 and the inclined wall 106 of the front wall 101 of the ink tank 100 to the outside of the housing 14 in the open position.

[Action and effect of the above embodiment]
According to the above embodiment, in order for the ink in the first ink chamber 131 to enter the third passage 173 and come into contact with the semipermeable membrane 183, the ink needs to pass through the first passage 171. Further, in order for the ink in the second ink chamber 132 to enter the third passage 173 and come into contact with the semipermeable membrane 183, the ink needs to pass through the second passage 172.

Further, according to the above embodiment, the first communication passage 171 and the second communication passage 172 communicate with each other at the communication points between the first communication passage 171 and the second communication passage 172 and the third communication passage 173. Therefore, at least a part of the ink distributed from the first communication passage 171 to the communication location enters the second communication passage 172 instead of the third communication passage 173. Further, at least a part of the ink distributed from the second communication passage 172 to the communication location enters the first communication passage 171 instead of the third communication passage 173.

From the above, according to the above embodiment, it is possible to reduce the contact of the ink stored in the first ink chamber 131 and the second ink chamber 132 with the semipermeable membrane 183.

Further, according to the above embodiment, the through hole 175 communicates ink from the first communication passage 171 and the second communication passage 172 to the third communication passage 173 along the left-right direction 9. Therefore, the ink that enters the third passage 173 from the first passage 171 and the second passage 172 through the through hole 175 flows along the left-right direction 9. Further, according to the above embodiment, the semipermeable membrane 183 is provided at a position different from the through hole 175 in the front-rear direction 8. Therefore, the ink that has entered the third continuous passage 173 does not reach the semipermeable membrane 183 unless the direction is changed from the left-right direction 9 to the front-back direction 8. As described above, according to the above embodiment, the contact of the ink that has entered the third passage 173 from the first passage 171 and the second passage 172 through the through hole 175 to the semipermeable membrane 183 is reduced. can do.

Further, according to the above embodiment, in order for the ink that has entered the third passage 173 from the first passage 171 and the second passage 172 to come into contact with the semipermeable membrane 183, the ink is inclined upward. It is necessary to circulate on the inner surface 182A. This makes it possible to reduce the contact of the ink with the semipermeable membrane 183.

Further, according to the above embodiment, a labyrinth 179 is provided between the semipermeable membrane 183 and the atmospheric opening 187. Therefore, even if the ink passes through the semipermeable membrane 183 due to an accident such as the semipermeable membrane 183 being torn, the ink is suppressed from flowing out to the outside of the ink tank 100 through the atmosphere opening 187.

[Modification example]
In the above embodiment, as shown in FIG. 6, the length L1 along the ink distribution direction between the boundary position 188 in the second passage 172 and the through hole 175 is the opening 174 in the first passage 171. It is shorter than the length L2 along the ink flow direction between the ink and the through hole 175. However, the length L1 and the length L2 may be substantially the same. Further, the length L1 may be longer than the length L2.

When the length L1 and the length L2 are substantially the same, the ink circulation distance between the first ink chamber 131 and the third continuous passage 173, or the second ink chamber 132 and the third continuous passage 173. One of the ink distribution distances between them does not become extremely short. Therefore, it is possible to suppress the entry of the ink stored in the first ink chamber 131 and the second ink chamber 132 into the third continuous passage 173.

Further, in the above embodiment, one injection port 112 is provided in each ink tank 100, but two or more injection ports 112 may be provided.

Further, in the above embodiment, one atmosphere opening port 187 is provided in each ink tank 100, but two or more may be provided.

Further, in the above embodiment, each ink tank 100 is provided with one opening 158 through which the ink flows out in the ink chamber 111, but two or more openings may be provided.

Further, in the above embodiment, the second ink chamber 132 includes the buffer chamber 148 and the ink outflow passage 114, but the first ink chamber 131 may include the buffer chamber 148 and the ink outflow passage 114. In this case, the buffer chamber 148 is interposed between the first ink chamber 131 and the ink outflow path 114. Further, both the first ink chamber 131 and the second ink chamber 132 may include the buffer chamber 148 and the ink outflow passage 114.

Further, in the above embodiment, ink has been described as an example of a liquid, but the present invention is not limited thereto. That is, instead of the ink, a pretreatment liquid that is ejected to the recording paper prior to the ink during printing, or water that is sprayed in the vicinity of the nozzle 40 of the recording head 39 to prevent the nozzle 40 of the recording head 39 from drying. However, it may be an example of a liquid.

10 ... Multifunction device (device)
39 ... Recording head (liquid consumption unit)
100 ... Ink tank (tank)
112 ... Injection port (liquid injection port)
131 ... 1st ink chamber (1st storage chamber)
132 ... Second ink chamber (second storage chamber)
140 ... Housing 145 ... Opening (second communication port)
149 ... Aperture (liquid outlet)
171 ... 1st communication passage 172 ... 2nd communication passage 173 ... 3rd communication passage 174 ... Opening (1st communication port)
183 ... Semipermeable membrane 187 ... Atmospheric opening

Claims (9)

A tank installed in an inkjet printer that has a recording head that ejects ink.
The inlet and
A storage chamber for storing ink injected from the injection port and
An outlet that allows the ink stored in the storage chamber to flow out toward the recording head, and
An atmospheric communication passage that connects the storage chamber and the outside of the tank,
It is provided in the atmospheric communication passage, and is provided with a semipermeable membrane that blocks the flow of ink from the atmospheric communication passage to the outside of the tank.
In the usage posture of the tank, the lower end of the semipermeable membrane is located above the portion where the liquid level of the ink in the storage chamber is located when the maximum amount of ink that can be stored is stored. And
In the usage posture of the tank, the lower end of the semipermeable membrane is located above the communication port communicating the storage chamber and the atmospheric communication passage.
In the usage posture of the tank, the semipermeable membrane is located below the wall that divides the upper surface of the atmospheric passage . The tank according to claim 1, wherein in the usage posture of the tank, the semipermeable membrane is located above the wall partitioning the upper surface of the storage chamber. The tank according to claim 2, wherein in the usage posture of the tank, the lower end of the semipermeable membrane is located above the wall partitioning the upper surface of the storage chamber. The tank according to any one of claims 1 to 3, wherein in the usage posture of the tank, the lower end of the semipermeable membrane is located above the wall partitioning the lower surface of the atmospheric communication passage. The tank according to claim 4 , wherein in the usage posture of the tank, the lower end of the semipermeable membrane is located above the wall constituting the upper surface of the atmospheric communication passage. The tank according to any one of claims 1 to 5, wherein in the usage posture of the tank, the upper end of the semipermeable membrane is located below the wall constituting the upper surface of the atmospheric communication passage. The tank according to any one of claims 1 to 6 , wherein the air communication passage has a U-turn in a portion extending from the storage chamber and the communication port communicating with the air communication passage to the semipermeable membrane. The tank according to any one of claims 1 to 7 , wherein the atmospheric passage has a labyrinth. The claim that both ends of the labyrinth in the vertical direction are located between a wall partitioning the upper surface of the atmospheric communication passage and a wall partitioning the lower surface of the atmospheric communication passage in the vertical direction in the usage posture of the tank. The tank according to 8 .

Images