JP2020163717A - Supply type liquid storage tank and image formation apparatus - Google Patents

Abstract

To provide a supply type liquid storage tank which can apply the sufficient back pressure to the liquid even when the residual amount of the liquid is reduced in a configuration that includes an absorber as back pressure application means and an image formation apparatus having the supply type liquid storage tank.SOLUTION: A supply type liquid storage tank to which the liquid can be supplied comprises: a tank body part to which the liquid is supplied; and a back pressure application member which is formed of an absorber absorbing the liquid and applies the back pressure to the liquid in the tank body part. A function lower limit instruction part indicating the liquid level height of the minimum amount of the liquid required to be stored in the tank body part for exhibiting the back pressure application function by the back pressure application member is set in the tank body part. The lower end of the back pressure application member is located at the height below the function lower limit instruction part.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a replenishment type liquid storage tank capable of replenishing liquid, and an image forming apparatus including the replenishment type liquid storage tank.

Conventionally, an inkjet printer having a liquid storage tank for storing a liquid such as ink and consuming the liquid stored in the liquid storage tank is known. As a liquid storage tank, a replenishment type liquid storage tank capable of appropriately replenishing liquid inside is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-161851

By the way, in an inkjet printer, a meniscus is formed in the ink at the tip of the nozzle by applying a back pressure, that is, a negative pressure, to the ink in the liquid storage tank so that the ink does not leak from the nozzle in a state where the ink is not ejected. It is required to keep it. Then, as a means for applying back pressure to the ink in the liquid storage tank, a configuration in which an absorber for absorbing the ink is provided is known.

However, when the back pressure applying means is composed of an absorber, a sufficient back pressure can be applied to the ink when a sufficient amount of ink is not supplied to the absorber due to a decrease in the remaining amount of ink in the tank. It will be difficult.

The present disclosure has been made in view of the above circumstances, and an object of the present invention is to provide an absorber as a back pressure applying means, and even if the remaining amount of the liquid is reduced, the back pressure is sufficient for the internal liquid. It is an object of the present invention to provide a replenishment type liquid storage tank capable of applying pressure, and an image forming apparatus including the replenishment type liquid storage tank.

The replenishment type liquid storage tank according to the present disclosure is a replenishment type liquid storage tank capable of replenishing a liquid inside, and is composed of a tank main body for replenishing the liquid inside and an absorber for absorbing the liquid. A back pressure applying member for applying back pressure to the liquid in the tank body is provided, and the tank body is stored in the tank body in order to exert the back pressure applying function by the back pressure applying member. A functional lower limit indicator is set to indicate the height of the minimum amount of liquid that needs to be kept, and the lower end of the back pressure applying member is located at a height equal to or lower than the functional lower limit indicator. It is characterized by.

The image forming apparatus according to the present disclosure is characterized by including a replenishment type liquid storage tank according to the present disclosure.

According to the present disclosure, the lower end of the back pressure applying member that applies back pressure to the liquid in the tank body must be stored in the tank body in order to exert the back pressure applying function by the back pressure applying member. It is located at a height below the functional lower limit indicator, which indicates the minimum amount of liquid. According to this configuration, even if the liquid level height of the liquid stored in the tank body is reduced to the function lower limit indicating portion, the lower end of the back pressure applying member can be maintained in the liquid. The back pressure applying member can absorb the liquid. Therefore, in the configuration in which the absorber is provided as the back pressure applying means, sufficient back pressure can be applied to the liquid inside the tank body even when the remaining amount of the liquid is reduced.

A vertical sectional view schematically showing a configuration example of a replenishment type liquid storage tank according to the present disclosure. The figure which shows schematic the structural example of the image forming apparatus which concerns on this disclosure. A diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 1). A diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (Part 2). A diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 3). A diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 4). FIG. 5 is a diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 5). FIG. 6 is a diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 6). FIG. 7 is a diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 7). FIG. 8 is a diagram schematically showing a modified example of the replenishment type liquid storage tank according to the present disclosure (No. 8).

Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. The ink storage tank 1 illustrated in FIG. 1 is an example of a replenishment type liquid storage tank in a usage posture, and a back pressure applying member 3 is provided inside a tank main body 2 constituting the outer shell thereof. The inside of the tank main body 2 is separated into an ink storage portion 5 and a back pressure applying member accommodating portion 6 by an isolation wall 4. The ink storage unit 5 is an example of a liquid storage unit, and forms a space in which ink can be stored. The back pressure applying member accommodating portion 6 accommodates the back pressure applying member 3 inside. The vertical length of the back pressure applying member accommodating portion 6 is longer than the vertical length of the ink storage portion 5. As a result, the upper wall portion 2a of the tank main body portion 2 is a stepped wall portion having a high wall portion 2a1 and a low wall portion 2a2 lower than the high wall portion 2a1.

The isolation wall 4 is provided so as to extend linearly from above to below at the boundary between the ink storage portion 5 and the back pressure applying member accommodating portion 6. The lower end of the isolation wall 4 does not reach the lower wall portion 2b of the tank main body portion 2, thereby forming a gap 4a. Inside the tank body 2, the ink storage portion 5 is below the convex portion 2L indicating the visual lower limit indicating portion ML2 described later, and the back pressure applying member accommodating portion 6 is convex indicating the visual lower limit indicating portion ML2 described later. The portions below the portion 2L communicate with each other through the gap 4a formed by the isolation wall 4. The isolation wall 4 is configured as a wall portion that cannot permeate a liquid such as ink.

Further, the ink storage tank 1 includes an auxiliary absorber 7. The auxiliary absorber 7 is arranged so as to spread to both the ink storage portion 5 and the back pressure applying member accommodating portion 6 through the gap 4a formed by the partition wall portion 4. The auxiliary absorber 7 is composed of means capable of absorbing ink, such as a sponge, a corpus cavernosum, and a bundle of capillaries, and moves ink from the ink storage portion 5 to the back pressure applying member accommodating portion 6. Demonstrate the function of promoting.

Further, the ink storage tank 1 is provided with an ink injection port 8. As a result, the ink storage tank 1 can appropriately replenish the ink, which is an example of the liquid, into the inside of the tank main body 2 via the ink injection port 8. That is, the ink storage tank 1 is configured as a replenishment type ink storage tank that can replenish ink from the outside to the inside. The ink injection port 8 is an example of a liquid injection port.

The ink injection port 8 is provided on the upper wall portion 2a of the tank main body portion 2. In this case, the ink injection port 8 is provided in the low wall portion 2a2 that constitutes the upper wall portion of the ink storage portion 5 in the upper wall portion 2a of the tank main body portion 2. Further, the ink injection port 8 penetrates the upper wall portion 2a of the tank body portion 2, in this case, the low wall portion 2a2 in the vertical direction, and the lower end thereof is below the upper wall portion 2a of the tank body portion 2, that is, , More specifically, it has a tubular shape protruding into the tank main body 2 and more specifically into the ink storage 5. Further, the ink injection port 8 has a structure in which the upper end thereof projects upward from the upper wall portion 2a of the tank main body portion 2. Further, the ink storage tank 1 is provided with a detachable cap 8a that can seal the ink injection port 8.

Further, the ink storage tank 1 includes an air communication port 9. In this case, the air communication port 9 is provided in the low wall portion 2a2 of the upper wall portion 2a of the tank main body portion 2 like the ink injection port 8. The air communication port 9 is an opening for allowing air to flow inside and outside the tank body 2.

Further, a function lower limit indicator ML1 is set in the ink storage tank 1. The function lower limit indicating unit ML1 has a height corresponding to the liquid level height of the minimum allowable amount of ink that needs to be stored in the tank body 2 in order to maintain the back pressure applying function by the back pressure applying member 3. This is the line set in the height. Further, the functional lower limit indicating unit ML1 is set at a position lower than at least the central portion in the vertical direction of the tank main body portion 2. Further, the functional lower limit indicating unit ML1 is set at a position higher than the lower wall portion 2b of the tank main body portion 2 at least.

Further, the ink storage tank 1 includes an ink outlet 10 for flowing out the ink in the tank main body 2 to the outside. As a result, the ink storage tank 1 can supply ink to the recording head 11 via the ink outlet 10. The ink outlet 10 is provided on the lower wall portion 2b of the tank main body portion 2. In this case, the ink outlet 10 is provided in the lower wall portion 2b of the tank main body portion 2 that constitutes the lower wall portion of the back pressure applying member accommodating portion 6. The recording head 11 is provided with a plurality of nozzles for ejecting ink to an image forming object such as a sheet. The recording head 11 forms an image on an image forming object by using ink supplied from the inside of the tank main body 2.

Next, a configuration example of the back pressure applying member 3 described above will be specifically described. The back pressure applying member 3 is composed of an absorber capable of absorbing a liquid, in this case, ink. As the absorber constituting the back pressure applying member 3, for example, an appropriate means can be adopted as long as it can absorb ink such as a sponge, a corpus cavernosum, and a bundle of capillaries. The back pressure applying member 3 absorbs the ink replenished inside the tank main body 2, in this case, the ink replenished inside the ink storage portion 5 via the ink injection port 8 through the gap 4a. That is, the back pressure applying member 3 absorbs ink from the lower portion thereof, and the absorbed ink permeates the back pressure applying member 3 from the lower side to the upper side.

Then, at least a part of the back pressure applying member 3, in this case, the lower end is located at a height equal to or lower than the above-mentioned functional lower limit indicating portion ML1. Further, the lower end of the back pressure applying member 3 is located at a height equal to or lower than the visual lower limit indicating portion ML2. The visual lower limit indicator ML2 is a line for the user to visually confirm the liquid level height of the ink in the tank main body 2. In this case, the visible line extending linearly in the horizontal direction on the side wall portion 2c of the tank main body portion 2, in other words, the physical line structure composed of the convex portion 2L is at the same height as the visual lower limit indicating portion ML2. It is provided in. The user can visually recognize that the height of the physical line structure in the vertical direction is the height of the visual lower limit indicating unit ML2. The physical line structure indicating the visual lower limit indicating portion ML2 is not limited to the convex portion protruding from the side wall portion 2c, and may be a concave portion recessed in the side wall portion 2c, or may be printed directly on the side wall portion 2c. It may be a label or a sticker attached to the side wall portion 2c. Further, the line structure can be any structure as long as it can show a height corresponding to the liquid level height of the ink stored in the tank main body 2 in a predetermined amount, such as a plurality of convex dots and concave dots. It may have such a structure. Further, the visual lower limit indicator ML2 is set at a position higher than the functional lower limit indicator ML1. That is, the functional lower limit indicator ML1 is located below the visual lower limit indicator ML2.

Further, the lower end of the back pressure applying member 3 is located at a height equal to or lower than the control lower limit indicating unit ML3. The control lower limit indicator ML3 is a line for the computer to check the remaining amount of the liquid in the tank main body 2. In this case, the control lower limit indicating unit ML3 is set as a line extending linearly in the horizontal direction on the side wall portion 2c of the tank main body portion 2. Further, the control lower limit indicator ML3 is set at a position higher than the functional lower limit indicator ML1 and lower than the visual lower limit indicator ML2. That is, the control lower limit indicator ML3 is located between the functional lower limit indicator ML1 and the visual lower limit indicator ML2. Further, the functional lower limit indicating unit ML1 is located below the control lower limit indicating unit ML3.

The control lower limit indicator ML3 may be set at a position higher than the visual lower limit indicator ML2. Further, as a computer that refers to the control lower limit indicating unit ML3, for example, a control device (not shown) that controls the overall operation of the image forming apparatus 100 described later can be considered. The control device is mainly composed of a microcomputer. For example, the amount of ink ejected from the nozzle of the recording head 11 is counted, and the ink residue in the tank body 2 is based on this count value. It is determined whether or not the amount has decreased to the control lower limit indicator ML3.

Further, the ink storage tank 1 has a configuration in which an ink storage portion 5 and an isolation wall 4 are interposed between the back pressure applying member 3 and the ink injection port 8 inside the tank main body portion 2. Therefore, the ink injection port 8 is provided so as to be in a non-contact state in which it does not come into direct contact with the back pressure applying member 3.

As illustrated in FIG. 2, the ink storage tank 1 according to the present disclosure is provided in an image forming apparatus 100 such as an inkjet printer. In this case, the image forming apparatus 100 is configured as an on-carriage type apparatus in which the ink storage tank 1 is provided on the carriage 101 that reciprocates when forming an image with respect to the image forming object. The image forming apparatus 100 may be an off-carriage type apparatus in which the ink storage tank 1 is provided in a portion other than the carriage. Further, the image forming apparatus 100 may be an apparatus including a line-shaped image forming portion that does not move back and forth. Further, the image forming apparatus 100 may be an apparatus in which the ink storage tank 1 is detachably provided, or may be a device in which the ink storage tank 1 is detachably provided. Further, the image forming apparatus 100 is not limited to an apparatus for forming an image with ink, and may be an apparatus for forming an image with a liquid other than ink.

According to the ink storage tank 1 described above, the lower end of the back pressure applying member 3 that applies back pressure to the ink in the tank main body 2 is located at a height equal to or lower than the functional lower limit indicating portion ML1. According to this configuration, even if the remaining amount of ink in the tank main body 2 is reduced to the function lower limit indicator ML1, the lower end of the back pressure applying member 3 can be maintained in the ink. Therefore, the back pressure applying member 3 can absorb the ink. Therefore, in the configuration including the back pressure applying member 3 made of an absorber as the back pressure applying means, sufficient back pressure is applied to the ink inside the tank main body 2 even when the remaining amount of ink is reduced. be able to.

Further, according to the ink storage tank 1, the functional lower limit indicator ML1 is located below the visual lower limit indicator ML2. According to this configuration, before the remaining amount of ink in the tank main body 2 decreases to the function lower limit indicator ML1, the user is made aware that the remaining amount of ink in the tank main body 2 is low. It can be made easier. As a result, it is possible to promptly replenish the ink into the tank main body 2 at an early stage, and it is possible to prevent a state in which sufficient back pressure is not applied to the ink. It is preferable to provide, for example, a transparent or translucent window portion in the tank main body portion 2 where at least the visual lower limit indicating portion ML2 is formed and the peripheral portion thereof so that the water surface of the ink inside can be confirmed. .. Further, the entire tank body 2 may be provided with a transparent or translucent member.

Further, according to the ink storage tank 1, the functional lower limit indicating unit ML1 is located below the control lower limit indicating unit ML3. According to this configuration, before the remaining amount of ink in the tank main body 2 decreases to the function lower limit indicating unit ML1, for example, the control device of the image forming apparatus 100 reduces the remaining amount of ink in the tank main body 2. It is possible to notify that it has become. As a result, it is possible to promptly replenish the ink into the tank main body 2 at an early stage, and it is possible to prevent a state in which sufficient back pressure is not applied to the ink.

Further, according to the ink storage tank 1, the functional lower limit indicating unit ML1 is located above the upper end of the ink outlet 10, and is the lower end of at least one of the back pressure applying member 3 and the auxiliary absorber 7. It is located higher. Therefore, according to the ink storage tank 1, even if the remaining amount of ink in the tank main body 2 is reduced to the function lower limit indicating unit ML1, the ink in the tank main body 2 is used in the back pressure applying member 3 and the auxiliary. The ink always flows out from the ink outlet 10 via the absorber 7. If the functional lower limit indicator ML1 is located below the upper end of the ink outlet 10, air may flow directly into the ink outlet 10. In this case, a nozzle of a recording head (not shown) There is a possibility that a phenomenon in which ink cannot be ejected from the ink, so-called ejection failure, may occur. Therefore, according to the ink storage tank 1 according to the present embodiment, it is possible to suppress the occurrence of such ejection defects.

The present disclosure is not limited to the above-described embodiment, and various modifications and extensions can be made without departing from the gist thereof.

That is, as illustrated in FIG. 3, the functional lower limit indicating unit ML1 may be configured to be located at a height equal to or higher than the lower end of the isolation wall 4. According to this configuration, even if the remaining amount of ink in the tank body 2 is reduced to the function lower limit indicating unit ML1, the ink flow path from the ink storage unit 5 to the back pressure applying member accommodating unit 6. The gap 4a can be filled with ink, and it is possible to prevent air from flowing from the ink storage portion 5 to the back pressure applying member 3 in the back pressure applying member accommodating portion 6.

Further, as illustrated in FIG. 4, the ink outlet 10 may be configured such that at least a part of the surface facing the auxiliary absorber 7 comes into contact with the auxiliary absorber 7. Further, as illustrated in FIG. 5 or 6, the ink outlet 10 may be configured such that the entire surface facing the auxiliary absorber 7 is in contact with the auxiliary absorber 7. That is, the detailed configuration of the ink storage tank 1 can be appropriately changed as long as the ink in the tank main body 2 always flows out from the ink outlet 10 via the auxiliary absorber 7. is there. The ink outlet 10 may be configured such that at least a part of the surface facing at least one of the auxiliary absorber 7 and the back pressure applying member 3 is in contact with the auxiliary absorber 7. Further, the ink outlet 10 may be configured such that all of the surfaces facing at least one of the auxiliary absorber 7 and the back pressure applying member 3 are in contact with the auxiliary absorber 7. That is, the ink storage tank 1 has a configuration in which at least the ink in the tank main body 2 always flows out from the ink outlet 10 via at least one of the auxiliary absorber 7 and the back pressure applying member 3. Good.

Further, as illustrated in FIG. 7 or 8, as long as the ink in the tank body 2 always flows out from the ink outlet 10 via the auxiliary absorber 7, the ink outlet 10 has an auxiliary absorption. The surface facing the body 7 may be in a non-contact state in which it does not come into contact with the auxiliary absorber 7.

That is, in the configuration example illustrated in FIG. 7, a rib 10a projecting into the tank main body 2 is provided on the upstream side of the ink outlet 10, and the auxiliary absorber 7 is provided in contact with the rib 10a. Has been done. In this configuration, a closed space S1 surrounded by the rib 10a and the auxiliary absorber 7 is formed. Even with this configuration, the ink in the tank main body 2 always flows out from the ink outlet 10 via the auxiliary absorber 7. Therefore, it can be included in the technical idea of the present disclosure.

Further, in the configuration example illustrated in FIG. 8, a rib 10a projecting into the tank main body 2 is provided on the upstream side of the ink outlet 10, and the auxiliary absorber 7 is provided in a state of being separated from the rib 10a. However, it is provided in contact with the inner surface of the tank body 2. In this configuration, a closed space S2 surrounded by the inner surface of the tank body 2 and the auxiliary absorber 7 is formed. Even with this configuration, the ink in the tank main body 2 always flows out from the ink outlet 10 via the auxiliary absorber 7. Therefore, it can be included in the technical idea of the present disclosure. The ink outlet 10 may be in a non-contact state in which the surface facing at least one of the auxiliary absorber 7 and the back pressure applying member 3 does not come into contact with the auxiliary absorber 7.

Further, as illustrated in FIG. 9, the atmospheric communication port 9 may be provided on both the high wall portion 2a1 and the low wall portion 2a2 of the upper wall portion 2a of the tank main body portion 2, or may be provided on either one of them. You may.

Further, as illustrated in FIG. 10, the ink storage tank 1 may be configured not to include the isolation wall 4. In this case, the back pressure applying member 3 may also be provided in the portion where the ink storage portion 5 was formed in the above-described embodiment. In this case, the upper portion of the back pressure applying member 3 has a stepped shape having a high portion 3a1 and a low portion 3a2 lower than the high portion 3a1. Also in this configuration, the functional lower limit indicating unit ML1 may be positioned at a height equal to or higher than the lower end of the back pressure applying member 3. In this case as well, the ink injection port 8 may be provided so as not to come into contact with the back pressure applying member 3. Further, in this case, the ink storage tank 1 may be configured not to include the auxiliary absorber 7. Further, in this case, the air communication port 9 may be provided in the high wall portion 2a1 constituting the back pressure applying member accommodating portion 6 in the upper wall portion 2a of the tank main body portion 2.

In the configuration in which the ink storage tank 1 is provided with the isolation wall 4, it is preferable that the air communication port 9 is provided not in the high wall portion 2a1 but in the low wall portion 2a2. Further, in the configuration in which the ink storage tank 1 is not provided with the isolation wall 4, it is preferable that the air communication port 9 is provided not in the low wall portion 2a2 but in the high wall portion 2a1. The most preferable arrangement position for the atmospheric communication port 9 is a configuration in which the ink storage tank 1 is provided on the low wall portion 2a2 in a configuration in which the isolation wall 4 is provided.

Further, the back pressure applying member 3 may be configured to be composed of a plurality of back pressure applying blocks. In this case, by making the liquid absorption performances of the plurality of back pressure applying blocks different, the liquid absorption performance of the back pressure applying member 3 as a whole, and by extension, the back pressure applying performance can be easily adjusted. Further, in this case, it is preferable that the back pressure applying block arranged on the lower side has a higher liquid absorption performance, and the back pressure applying block arranged on the upper side has a lower liquid absorption performance. As a result, it is possible to easily form a portion of the upper part of the back pressure applying member 3 where the liquid is difficult to be absorbed, and the liquid permeates the entire back pressure applying member 3, in other words, the back pressure applying member. It is possible to prevent the back pressure applying function of No. 3 from being reduced or extinguished.

1: Ink storage tank (replenishment type liquid storage tank) 2: Tank body part 3: Back pressure applying member 4: Isolation wall 5: Ink storage part (liquid storage part), 6: Back pressure applying member storage part , 7: Auxiliary absorber, 10: Ink outlet (liquid outlet), 100: Image forming apparatus, ML1: Function lower limit indicator, ML2: Visual lower limit indicator, ML3: Control lower limit indicator

Claims (14)

A replenishment type liquid storage tank that can replenish liquid inside
The tank body, which is replenished with liquid inside,
A back pressure applying member that is composed of an absorber that absorbs liquid and applies back pressure to the liquid in the tank body, and
With
In the tank main body, a functional lower limit indicator indicating the minimum liquid level height of the liquid that needs to be stored in the tank main body in order to exert the back pressure applying function by the back pressure applying member. Is set,
A replenishment type liquid storage tank characterized in that the lower end of the back pressure applying member is located at a height below the functional lower limit indicating portion. The tank main body is further provided with a visual lower limit indicator for the user to visually check the remaining amount of liquid in the tank main body.
The replenishment type liquid storage tank according to claim 1, wherein the functional lower limit indicator is located below the visual lower limit indicator. The inside of the tank main body is separated into a liquid storage portion for storing liquid and a back pressure applying member accommodating portion for accommodating the back pressure applying member, and more than the visual lower limit indicating portion of the liquid storage portion. It is provided with an isolation wall that communicates the lower portion with the portion below the visual lower limit indicating portion of the back pressure applying member accommodating portion.
The replenishment type liquid storage tank according to claim 2, wherein the functional lower limit indicator is located at a height equal to or higher than the lower end of the isolation wall. The tank main body is further provided with a control lower limit indicator for determining the remaining amount of liquid in the tank main body based on the count value of the liquid discharge amount.
The replenishment type liquid storage tank according to any one of claims 1 to 3, wherein the functional lower limit indicating unit is located below the control lower limit indicating unit. A liquid outlet for discharging the liquid in the tank body is provided.
The replenishment type liquid storage tank according to any one of claims 1 to 4, wherein the liquid in the tank main body flows out from the liquid outlet via the back pressure applying member. The replenishment type liquid storage tank according to claim 5, wherein at least a part of the surface of the liquid outlet facing the back pressure applying member is in contact with the back pressure applying member. The replenishment type liquid storage tank according to claim 5, wherein the liquid outlet has all surfaces facing the back pressure applying member in contact with the back pressure applying member. The replenishment type liquid storage tank according to claim 5, wherein the liquid outlet is in a non-contact state in which the surface facing the back pressure applying member does not contact the back pressure applying member. The replenishment type liquid storage tank according to any one of claims 5 to 8, further comprising an auxiliary absorber in addition to the back pressure applying member. The replenishment type liquid storage according to claim 9, wherein the liquid in the tank body flows out from the liquid outlet via at least one of the auxiliary absorber and the back pressure applying member. tank. 10. The liquid outlet according to claim 10, wherein at least a part of a surface facing at least one of the auxiliary absorber and the back pressure applying member is in contact with the auxiliary absorber. Replenishment type liquid storage tank. The replenishment according to claim 10, wherein the liquid outlet has all of the surfaces facing the auxiliary absorber and at least one of the back pressure applying members in contact with the auxiliary absorber. Type liquid storage tank. The tenth aspect of the present invention, wherein the liquid outlet is in a non-contact state in which a surface facing at least one of the auxiliary absorber and the back pressure applying member does not come into contact with the auxiliary absorber. Replenishment type liquid storage tank. An image forming apparatus comprising the replenishment type liquid storage tank according to any one of claims 1 to 13.

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