KR100478922B1 - Apparatus of supplying ink for printer - Google Patents

Abstract

An ink feed device of a printer is provided to supply ink continuously and quantitatively by arranging an ink feed tank and an ink container and to stabilize the pressure of the ink fed to a head by restricting a level changeable range of the ink in the ink feed tank within the height of an ink cartridge. An ink feed device of a printer is composed of an ink feed tank(33) of which the inside is empty to form an ink storage unit for supplying ink to an ink cartridge(31), positioned in parallel with the ink cartridge to place the ink cartridge in a storage region of the ink storage unit; at least one ink container(34) arranged in parallel to the ink feed tank to store the ink to supply the ink to the ink feed tank and positioned higher than the ink feed tank; a connecting tube(36) for coupling the ink feed tank and the ink container to send the ink stored in the ink container to the ink feed tank; an air injecting tube(38) installed at an ink container cap(39) to deliver the ink of the ink container through the connecting tube to the ink feed tank by applying pneumatic pressure; a discharge tube(32) for connecting the ink feed tank and the ink cartridge to take out the ink contained in the ink feed tank to the ink cartridge; and an ink feed frame for supplying the ink to the ink cartridge by fixing the ink feed tank and the ink container.

Description

Apparatus of supplying ink for printer

The present invention relates to a printer ink continuous supply device, and in particular, to provide a large-capacity ink supply device that is always supplied with ink in order to enable continuous supply of ink, it is possible to maintain a constant ink pressure and to print stable The present invention relates to an ink supply apparatus of a printer for stably supplying ink to a printer without damaging the print head due to air bubbles remaining in ink supplied from the outside and bending in the printing line.

As large-scale due diligence, wide color, and banners are widely used, the demand for large inkjet printers, such as a printer for printing them, has increased, and when printing a printed matter using a large inkjet printer, the printing is usually implemented in colors of 2 degrees or more.

The ink supply method for the printer is largely known as a method of directly attaching a factory-prepared cartridge to the printer and supplying ink consumed in the printer separately from the cartridge, directly or indirectly from the outside. .

The former method of outputting printed matter using a standardized cartridge is unsuitable for large size inkjet printers. That is, when printing a printed matter, the size of the printed matter is large, so that the ink of the cartridge supplying ink in the middle of the printed matter is likely to be exhausted. When the ink runs out, the printer is paused and the cartridge is replaced and printed again. This causes the operator to wait at all times and delays in working hours due to replacement of the cartridge. It checks in advance whether there is enough ink remaining in the cartridge, and if it is insufficient, it is replaced with a new one beforehand, resulting in economic loss. Also, since the cartridge is replaced frequently, it is a source of environmental pollution due to the disposal of a large quantity of cartridges. In addition, it was not easy to check the remaining ink level inside the cartridge during printing, and it was inconvenient to manage it by checking the remaining amount of computer numerically until the printing was finished. Cartridge cost The cost of the cartridge molding and additional consumption costs had to deal with an expensive one-off cost of consumables.

In order to improve the problems and inconvenience of using the standardized cartridge, a method of supplying ink from the outside of the cartridge is known. 1 is a reference diagram for explaining the configuration of an inkjet printer using a standardized cartridge, and FIGS. 2 and 3 are reference diagrams showing the configuration of an external ink supply apparatus mounted in the inkjet printer.

1 is a perspective view of a general large size inkjet printer.

In the inkjet printer 10, an operation panel 11 for various operations is provided at the front side, an ink cartridge storage box 13 for mounting the ink cartridge 12 is provided at the side, and an ink cartridge storage box ( 13), the stand 14 for supporting an inkjet printer main body is provided. In the case of a color printer, since the ink cartridge 12 must be provided for each color, a plurality of ink cartridge slots 15 for installing the ink cartridge 12 for each color are formed.

In order to improve the problem of frequently replacing the ink cartridge 12 in such a large inkjet printer 10, the ink replenishment tank is connected to the inkjet printer 10 in a state where the ink cartridge 12 is mounted in the inkjet printer 10 through a connection tube. The ink was refilled by gravity by connecting to the ink cartridge and installing the ink replenishment tank at a higher position than the ink cartridge.

FIG. 2 is a perspective view of an ink refilling apparatus directly mounted to a conventional inkjet printer 10, wherein an ink cartridge 12 is mounted in an ink cartridge storage box 13 installed on one side of a main body of the inkjet printer 10, Ink consisting of a supply pipe for injecting ink by physically inserting the ink refill tank storage box 17 for accommodating the ink replenishment tank 16 on the ink cartridge storage box 13 and then physically inserted into the ink cartridge 12 The supply tube 18 is connected to the ink refill tank 16 to supply ink to the ink cartridge 12 in a state where the ink cartridge 12 is mounted by gravity.

3 is a detailed view of the ink refilling apparatus of FIG. 2, which is provided in the ink refilling tank storage box 13 and includes an ink refilling tank 16 and an ink cartridge receiving box 13 in which a lid 19 for filling ink is formed. The ink cartridge 12 mounted on the is connected to the supply tube 18, the solenoid valve 20 for regulating the ink supply is configured in the middle of the supply tube 18. The solenoid valve 20 is operated by an operation switch (not shown) when the ink filled in the ink cartridge 12 is consumed below a fixed amount. One side of the ink cartridge 12 is formed with an ink inlet 21 for receiving ink from the supply tube 18, and the other side has an ink outlet 22 for supplying ink to the printer through a connecting tube. . The ink cartridge 12 is attached to the storage pack 23 for storing ink and the storage pack 23 attached to the storage pack 23 to detect the movement of the operation plate and the operation plate in association with the storage pack as the ink is consumed, and thus the solenoid valve 20 There is a detection switch (not shown) for operating the.

The ink supply device of the conventional inkjet printer can improve the hassle of frequently replacing the ink cartridge 12, but a large amount of bubbles generated when the ink is poured into the container is taken into the tube and damaged the head. If there is a problem with the operation switch and solenoid valve, there is a danger that all the ink will flow over the head and the printer will be damaged.

On the other hand, other techniques are known to solve such problems as gravity supply of ink and location constraints depending on location.

For example, there is a forced feeding device that electrically pumps ink to automatically replenish the ink. This device uses an electric drive to supply ink to the cartridge by force pumping, which necessitates an enlargement of the equipment and complicated driving control, which reduces economic efficiency and efficiency. When the ink is poured into the cartridge when the ink is poured into the cartridge, Similarly, bubbles in the ink, which occurs when the ink is poured, cause problems.

In addition, although there is a device in which a nozzle is provided in the hole of the ink container and ink is supplied by pressure, this device has a problem in that it is impossible to suppress the generation of bubbles due to the formation of air bubbles generated during the ink supply process.

In addition, when ink is poured into the ink container, bubbles are generated. In order to suppress the bubble generation, a complicated control system for controlling a supply line supplied from the ink container to the cartridge is required, but it is not effective.

In addition, in order to externally display and control the amount of ink consumed and the time of supply of ink, a complicated device for managing the remaining amount of ink, such as displaying a buoy in the ink container to detect the amount of movement and measuring the water level, must be additionally installed. There was a problem.

After all, the problems of the conventional continuous ink supply device are the print quality deterioration and the print head damage due to the unstable pressure of the ink injected for printing to the print head and the fine bubbles in the ink, because the print head does not have any valve device, so the ink This could be caused by pressure. That is, when the ink container is positioned higher than the head, the ink flows down, and when the ink container is positioned lower, a large injection pressure is required during printing, so that ink cannot be ejected during ink injection, and banding occurs on the printing surface. Even if such a problem was solved by using a complicated control device or the like, the problem of bubble generation when replenishing ink with a continuous ink supply device from the outside was not solved eventually. Once poured, the ink contains a large amount of fine bubbles. The ink is more viscous than water, and remains in the ink for a long time without disappearing like water. The way to remove this bubble is to wait or warm for more than a day. In real shops, it was practically impossible to postpone work and wait for one day each time you replenish ink for each color, so most inkjet printer users simply use cartridges or disassemble the print head from time to time. I had to deal with pulling air out of the damper on the print head.

Accordingly, it is an object of the present invention to provide an ink supply apparatus capable of continuously supplying a sufficient amount of ink required by a printer.

Another object of the present invention is to provide an ink supply device capable of automatically and quantitatively replenishing ink required by a printer with a relatively simple device.

Still another object of the present invention is to provide stable printing by maintaining a constant pressure at all times when using a printer as well as when supplying ink to the ink supply device from the outside.

Still another object of the present invention is to prevent supply of bubbles generated during the ink filling process of the ink container without any disruption to the work, and to supply stabilized supply without a separate device, thereby damaging the print head caused by bubbles and resulting print quality degradation. It is to provide an ink supply device that can eliminate the banding phenomenon.

Still another object of the present invention is to make it possible to display and control the consumption amount of ink and the supply time of ink externally without any equipment.

The ink supply apparatus of the printer according to the present invention for achieving the above object, the ink cartridge mounted in the printer to supply the ink, and stored around the printer to supply and replenish the ink required by the ink cartridge from the outside A printer ink supply device comprising an ink supply tank for sending ink to an ink cartridge, and an export tube connecting the ink supply tank and the ink cartridge to send ink in the ink supply tank to the ink cartridge,

The ink supply device of the printer,

An ink supply tank in which an interior is emptied into a space for storing ink for supplying ink to the ink cartridge side so as to form an ink reservoir and positioned in a direction parallel to the ink cartridge so that the ink cartridge is placed in the storage region of the ink reservoir;

At least one ink container, in which ink is stored to supply ink to the ink supply tank, and disposed in a direction parallel to the ink supply tank, and at least one of the heights of which is higher than the ink supply tank;

A connection tube connecting the ink supply tank and the ink container to send the ink stored in the ink container to the ink supply tank;

An air injection tube mounted on the ink container cap to actuate air pressure to transfer the ink stored in the ink container to the ink supply tank through the connecting tube;

A discharge tube connecting the ink supply tank and the ink cartridge to carry out the ink contained in the ink supply tank to the ink cartridge;

And an ink supply frame for supplying ink to the ink cartridge by fixing the ink supply tank and the ink container.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

4 is a front view for explaining the overall configuration of the printer ink supply apparatus according to an embodiment of the present invention. 5 schematically shows an arrangement state of an ink supply apparatus according to an embodiment of the present invention. 6 is a view showing a frame arrangement of the ink supply apparatus according to an embodiment of the present invention. 7 is a reference diagram for explaining a frame arrangement state of the ink supply apparatus according to the embodiment of the present invention.

The configuration example of the printer ink supply device according to the present invention is as shown in Figs.

In the printer ink supply apparatus according to the present invention, as shown in Fig. 4, the ink cartridge 31 mounted in the printer 30 to supply ink and the ink required by the ink cartridge 31 are replenished by external supply. In order to send the ink to the ink cartridge 31, which is stored around the printer 30 to send ink to the ink cartridge 31, and a carrying tube connecting the ink supply unit and the ink cartridge 31 to send ink to the ink cartridge 31. (32) is provided.

Specifically, as shown in Figs. 4 and 5, the ink is emptied into a space for storing ink for supplying ink to the ink cartridge 31 side, thereby forming an ink storage portion and being located at a height parallel to the ink cartridge 31. An ink supply tank 33 positioned so that the cartridge 31 is placed in the storage area of the ink storage portion, and ink is stored to supply ink to the ink supply tank 33 side, so that ink is stored in parallel with the ink supply tank 33. At least two ink containers (34) and (35) disposed at a height higher than the bottom of the ink supply tank (33), and the ink stored in the ink container (34). A connection tube 36 connecting the ink supply tank 33 and the ink container 34 to the ink supply tank 33, and the ink stored in the ink container 34 is connected to the connection tube 36. through An ink cartridge containing an air injection tube 38 mounted on the cap 37 of the ink container 34 to exert air pressure to move to the ink supply tank 33, and the ink contained in the ink supply tank 33. An ejection tube 32 connecting the ink supply tank 33 and the ink cartridge 31 for carrying out to the 31 and the ink supply tank 33 and the ink container 34 are fixed to the ink cartridge ( 31) is composed of an ink supply frame 40 for supplying ink to the ink.

In addition, the ink supply tank 33 may display an ink indicator line indicating a stored ink amount at a low water level, a high water level, and an ink container change. If a separate display unit is formed, the user can observe the remaining amount and consumption of the ink from the outside, so that the user can know the replacement time of the ink container and can check whether the water level of the ink is located within the water level to ensure a stable water pressure.

In addition, the connecting tube 36 and the carrying tube 32 is provided with a cap 39 or a hole in the side to fix the tube. In addition, the ink flowing from the connecting tube 36 is free from dropping The connection tube 36 located in the ink supply tank 33 is located below the low water level in order to fundamentally block the possibility of the ink bubbles caused by the drop by directly entering the ink level.

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In addition, the length of the carrying tube 32 is to reach the bottom. When printing, the ink stored in the ink supply tank 33 continues to the ink cartridge through the discharge tube 32, at this time the water level of the ink inside the ink supply tank is lowered gradually. If the user did not see the ink level drop below the ink change line and left it, the time it took for the ink level to fall from the ink level to the low water level depends on the amount of ink used, but it took more than a few weeks. And even if it falls below the low water level, since the ink suction port of the discharge tube 32 is located at the bottom of the ink supply tank, the possibility of inflow of air into the head due to the exhaustion of ink is slim.

In addition, the high water level level indicated on the ink supply tank 33 is the same height as the top of the ink cartridge 31 mounted on the actual inkjet printer, and the low level is low on the bottom of the ink cartridge 31. The height is equal to the height. The position of the cartridge slot of the inkjet printer to which the ink cartridge is mounted is designed to be the same height as the print head so that the ink supplied to the print head has an optimum water pressure. For that reason, if the water level of the ink falls below the low level level (low) indicated in the ink supply tank 33, there is a possibility that the ink ejection of the inkjet printer head may be weakened, so that the ejection amount may not be reduced or ejected. When the surface of the ink rises above the top, the pressure of the ink injected into the inkjet print head increases, and the ink flows down to the print head.

In addition, a preliminary ink container 35 filled with ink is disposed in addition to the ink container 34 in use by being connected to the ink supply tank 33 and the connection tube. When the ink container is transported and replaced or filled with ink, countless bubbles are dissolved in the ink, and the bubbles are removed only after one or more idle periods. Therefore, the ink container 34 is used up to the preliminary ink container 35. As soon as the container cap is replaced to supply ink to the ink supply tank 33, the ink must be poured into the previously used ink container 34 or replaced with a new ink container. If only one ink container 34 is used without the preliminary ink container 35, it is necessary to wait for at least one day after pouring or replacing the ink in the ink container, and then supply ink to the ink supply tank 33. Since it takes at least a few days to go from the ink replacement line to the low water level, there is no problem, but it is preferable to put a spare ink container because it is cumbersome.

Further, the ink container change line is equal to the height of the bottom position of the ink container 34 and is positioned higher than the low water level of the ink supply tank 33. After the ink of the ink container 34 is exhausted, the container cap is transferred to the preliminary ink container 35, and the ink of the preliminary ink container 35 is transferred to the ink supply tank 33 through the filling process. Immediately after the ink level of 33) is equal, the bottom height of the ink container, that is, the ink container change line, is set at an appropriate position so that the ink level is below the high water level.

In addition, the portion of the carrying tube 32 passing through the inside of the ink cartridge 31 forms several curved irregularities 36a and 36b. If a small amount of air bubbles remain in the ink that finally reaches the cartridge, the air bubbles collect at the upper part of the bend, and when the ink is discharged, the ink flows out to the lower part of the tube space, but the air bubbles do not go down toward the cartridge ink discharge port. (36a) and (36b), which can later be raised to remove the air bubbles through the ink outlet.

6 and 7, the water level is formed on the front surface of the ink supply tank 33 by forming the frame main body 41 and the mask lower surface of the frame main body 41. Open window 42 to expose the high and low level and ink container change marks to the outside, and to form the top surface of the mask and to check whether the ink is exhausted in the ink container. Drill a hole to expose the transparent connection tube.

In addition, an ink supply tank accommodating portion 43 for fixing and accommodating the ink supply tank 33 and an ink container for fixing the ink containers 34 and 35 at a position higher than the ink supply tank 33. An ink container 34 supported by the fixing holder 44 and its supporting plate 45, the ink supply tank 33 accommodated in the ink supply tank 33, and the fixing holder 44 and the supporting plate 45. An open lid 46 can be provided for replacement and inspection of the 35. Here, one end of the lid 46 may be provided with a hinge 47 for opening and closing the lid 46 from the frame body 41, the fixing holder 44 is fixed to the ink containers 34, 35 without flow The fixing holes 48 corresponding to the ink containers 34 and 35 are formed to be able to do so.

 In addition, the lug is separated and assembled with the main body of the frame 40 to facilitate storage and transportation, and the lug 47 is configured in a structure that can be adjusted in height to the frame 40 and the printer having a variety of positions and height specifications The lug 47 can be shared. As shown in FIG. 6, the ink in the ink supply tank 33 and the ink in the ink container 34 are connected through a tube 36 filled with ink therein without air. If present, the ink level inside the ink supply tank 33 and the ink level inside the ink container 34 are always the same by the potential energy of both inks. When printing, the ink stored in the ink supply tank 33 is continuously discharged to the ink cartridge through the discharge tube 32. At this time, the surface of the ink inside the ink supply tank 33 is gradually lowered and the ink container. The ink level of 34 is also lowered to the same height, so when the ink level of the ink supply tank 33 becomes the ink replacement line, the ink of the ink container 34 is exhausted, and the ink of the connecting tube is removed. do. At this time, the ink container cap is separated from the empty ink container 34 and left to stand for a long time. Then, the ink container cap is mounted with another ink container 35 having no dissolved bubbles in the ink, and then the syringe is injected through the air injection tube 38. When the air is blown in once, the ink in the ink container 34 flows through the connecting tube by the pressure of the air in the empty space of the ink container, and the ink level inside the ink supply tank 33 rises and the ink container rises. The ink surface of the 34 is lowered, and as a result, the ink inside the ink supply tank 33 and the ink of the ink container 34 are connected to the inside of the ink supply tank 33 through the connection tube 36 filled with ink therein without air. Both sides are parallel with the same level of water. That is, when the ink supply tank 33 and the upper inlet of the ink container 34 are connected to the connection tube 36, the ink of the ink container 34 side is supplied to the ink supply tank 34 through the connection tube 36. This is because the ink supply tank 33 having the ink storage portion is positioned at the same level as the ink cartridge 31 so that the ink cartridge 31 is placed in the storage region of the ink storage portion, and the ink container 34 is the ink. This is because the ink is stored in a direction parallel to the ink supply tank 33 to supply ink to the supply tank 33, and the bottom surface thereof is positioned higher than the bottom of the ink supply tank 33. The tube 36 interconnects the ink supply tank 33 and the ink container 34 to serve as a passage for supplying ink to the ink supply tank 33 side of the ink container 34. Ink container 34 side ining through 36 The ink can be sent to the ink supply tank 33 by the height difference between the ink supply tank 33 and the ink container 34. Initially, the ink on the ink container 34 side is moved to the ink supply tank 33 side. In order to send through the tube 36, artificial air injection is required, and once the air is blown through the air injection tube 38 in the ink container 34 to a device such as a syringe once, it is instantaneously inserted into the internal space of the ink container 34. Air pressure acts so that ink in the ink container 34 is not exposed to the air through the connecting tube 36, and continuously until the ink in the ink container 34 runs out into the ink of the ink supply tank 33. Here, preferably, the height of the ink surface in the parallel state due to the initial ink injection is preferably lower than the high water level level. In addition, since the volume of the ink supply tank 33 and the ink container 34 is directly related to the ink level control, the volume of the ink storage space of the ink supply tank 33 and the ink container 34 is determined, and the ink container 34 The height of h3 should be adjusted accordingly. That is, the volume of the ink storage space of the ink container 34 is directly related to the current ink amount of the ink supply tank 33 supplied through the connecting tube 36 toward the ink supply tank 33, which is similar to that of FIG. 5. Similarly, it is desirable to be able to display or set the water level in advance in the ink supply tank 33 by high, change, low, etc. In this case, the ink container 34 directly affects the water level. Since the stored ink amount, the ink storage space of the ink supply tank 33 and the ink storage space of the ink tank 34 can adjust the level of the ink supply tank 33 by adjusting the volume of the ink storage space in advance. In addition, the height of the ink container 34 directly affects the supply of ink to the ink supply tank 33. If the height of the position of the ink container 34 is lower than the ink supply tank 33, the tube 36 is formed. Continuous supply of ink through It is preferable that the height difference h3 between the ink supply tank 34 and the ink container 34 is appropriately adjusted because there is a high possibility of supply failure.

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The ink supply process by the ink supply apparatus of the printer according to the present invention is as follows.

When liquids in two spaces at different levels are connected together through a tube filled with liquid, the liquid flows through the tube from the higher potential energy to the lower potential energy, so that the level of the two spaces becomes the same as the liquid in one space.

Like this principle, when the ink inside the ink supply tank and the ink of the ink container are connected through the connecting tube 36 filled with ink inside without air as shown in FIG. 6, the ink inside the ink supply tank by the potential energy of both inks. The ink level in the ink container and the ink level inside the ink container are always the same.

When continuously printing, the ink stored in the ink supply tank 33 is discharged to the ink cartridge little by little through the export tube 32. At this time, the level of ink in the ink supply tank is lowered very slowly, and the ink container The ink of 34 moves through the connecting tube 36 into the ink of the ink supply tank 33, and the ink level of the ink container 34 is also lowered to the same height. As a result, when the ink level of the ink supply tank becomes the ink container change line, all of the ink in the ink container 34 is exhausted and all the ink in the connection tube 36 is drained.

At this time, the ink container cap is separated from the empty ink container 34, and the ink container cap is mounted with a spare ink container 35 having no air bubbles in the ink at all for a long time, and then through the air injection tube 38. When the air is blown by a device such as a syringe once, the ink in the ink container 35 flows out through the connection tube by the momentary pressure of the air in the empty space of the ink container, and the flowed ink is not exposed to the air. It goes straight into the ink in the ink supply tank. Through this process, the ink in which the bubble is removed through a long rest period in the ink container is injected into the ink supply tank 33 without generating additional bubbles.

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Finally, the air bubbles are once again filtered out through the curved several uneven portions 36a and 36b of the portion of the discharge tube 32 via the inside of the ink cartridge 31.

On the other hand, the ink supply tank 33 has its own function of purifying the fine bubbles remaining in the ink. That is, when the ink is supplied to the ink supply tank 33, the ink is exhausted and bubbles contained in the ink which are in the standby state of being in the supply standby state are naturally extinguished so that the continuous supply of the stable ink is achieved.

As described above, in the present invention, a sufficient amount of ink required by the printer can be continuously and quantitatively supplied without a separate supply device through the arrangement of the ink supply tank and the ink container, and in particular, the ink in the ink supply tank By limiting the water level fluctuation range within the height of the mounted ink cartridge, the ink pressure supplied to the head is stabilized, and the bubble generated in the process of filling the ink in the ink container can be stabilized and supplied without a separate device. It has the effect of eliminating damage and printing banding, providing high reliability in print quality, and displaying and controlling the ink consumption and ink supply time externally without any equipment. To maintain the supply in a continuous flow by pressure It is effective as possible the configuration of the printer ink supply at a low price.

1 is a view showing the configuration of a general inkjet printer

2 is a view for explaining an example of a conventional ink supply apparatus.

3 is a detailed view for explaining the configuration of the ink supply apparatus of FIG.

4 is a front view for explaining the overall configuration of the printer ink supply apparatus according to an embodiment of the present invention

5 is a diagram schematically showing an arrangement state of an ink supply apparatus according to an embodiment of the present invention;

6 is a view showing a frame arrangement of the ink supply apparatus according to an embodiment of the present invention

7 is a reference view for explaining a frame arrangement state of the ink supply apparatus according to the embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

30: printer 31: ink cartridge

32: discharge tube 33: ink supply tank

34.35: Ink container 36: Connection tube

37: cap 38: air injection tube

39: cap 40: frame

41: frame body 42: window

43: accommodating portion 44: fixed holder

45: base plate 46: cover

47: Rug

Claims (8)

An ink cartridge mounted in the printer to supply ink, an ink supply unit for storing ink around the printer to supply the ink required by the ink cartridge from outside and replenishing the ink to the ink cartridge, and ink in the ink supply unit In the printer ink supply device consisting of a discharge tube connecting the ink supply unit and the ink cartridge for sending to the cartridge, An ink supply tank in which an interior is emptied into a space for storing ink for supplying ink to the ink cartridge side so as to form an ink reservoir and positioned in a direction parallel to the ink cartridge so that the ink cartridge is placed in the storage region of the ink reservoir; At least one ink container, in which ink is stored to supply ink to the ink supply tank side and disposed in a direction parallel to the ink supply tank, and at least one of the heights of which is higher than the ink supply tank; A connection tube connecting the ink supply tank and the ink container to send the ink stored in the ink container to the ink supply tank; Ink stored in the ink container through the connection tube to the ink supply tank An air injection tube mounted on the ink container cap to move the air pressure to the side; A discharge tube connecting the ink supply tank and the ink cartridge to carry out the ink contained in the ink supply tank to the ink cartridge; And an ink supply frame for fixing the ink supply tank and the ink container to supply ink to the ink cartridge. The method of claim 1, The ink supply tank has an ink indicator line (low / high / chang) indicating the amount of ink stored, and the ink supply device of the printer, characterized in that it comprises a cap or tunnel for fixing the connection tube and the export tube. The method of claim 1, The length of the connection tube and the discharge tube located in the ink supply tank is the ink supply device of the printer, characterized in that the length of the discharge tube in the water level direction longer than the length of the connection tube. The method of claim 1, And the length of the connection tube and the discharge tube is set in the ink supply tank at a position lower than the low water level indicated on the ink supply tank. The method of claim 1, And the ink cartridge is positioned at a range of an ink storage area of a low level level and a full level level displayed on an ink supply tank. The method of claim 1, The ink supply device of the printer, characterized in that the position of the ink container has a constant height difference between the bottom surface of the ink supply tank and the ink container so as to lie in the area between the low water level and the full water level of the ink supply tank. The method of claim 1, And a portion of the discharge tube passing through the ink cartridge to form curved irregularities to filter fine bubbles. The method of claim 1, The frame, the frame body, A window formed to form a mask surface of the frame body and open the display line displayed on the front portion of the ink supply tank to the outside; A hole drilled to expose the connection tube to the outside of the frame body, An ink supply tank accommodating part for fixing and accommodating the ink supply tank; An ink container fixing holder and a support plate for fixing the ink container at a higher position than the ink supply tank; And an openable cover for replacing and inspecting the ink supply tank accommodated in the ink supply tank and the ink container supported by the fixing holder and the support plate, An ink supply apparatus for a printer, comprising: a lug supporting the frame body, being separated and replaced, and having an adjustable overall height.