KR20010037240A - Method and kit for replugging a ink of ink cartridge - Google Patents

Abstract

PURPOSE: A method for refilling ink in an ink cartridge and a kit thereof are provided to refill ink into an ink supply chamber and an ink storage chamber of an ink cartridge for reuse the ink cartridge several times, thereby saving printer maintaining cost. CONSTITUTION: A method for refilling ink in an ink cartridge includes the steps of removing a sealing ball out of an injection hole(14b) formed on a lid(14) of an ink cartridge(10) of which ink is exhausted out and supplying ink into an ink supply chamber in a body(11) of the cartridge by holding an injection part(19a) of an ink case(19) against the injection hole after injecting ink into the ink supply chamber of the cartridge body and turning over the cartridge body to stand right, and sealing the injection hole of the lid of the ink cartridge with an injection hole lid(17).

Description

Refilling method of ink cartridge and its kit {Method and kit for replugging a ink of ink cartridge}

The present invention relates to a method for refilling an ink cartridge and a kit thereof, and more particularly, to refill ink into an ink cartridge in which ink consumption of an ink cartridge having an ink storage chamber and an ink supply chamber is completed. The present invention relates to an ink cartridge refilling method and an ink refill kit for removing ink and air from the inside of an ink bag to control internal air pressure and at the same time preventing the ink jet nozzle from drying.

Printers include dot printers, ink jet printers, laser printers, and the like, and are used by mounting ink cartridges in which ink is stored in the ink jet printers.

These ink cartridges are classified into a porous member insertion method in which a porous member made of polyurethane or the like is inserted according to the internal structure, and an automatic pressure control method for automatically adjusting the internal pressure of the ink cartridge. have.

The porous member inserting method has a porous member inserting portion into which a porous member made of polyurethane or the like is inserted into the ink cartridge, and the automatic pressure regulating method inserts an ink discharge pressure into an ink storage chamber which is a space portion inside the ink cartridge. It is provided with a pressure regulating air bag to keep a constant.

In particular, in the ink cartridge 10 of the mixing method, the ink supply chamber 11a and the ink storage chamber 11b into which the porous member 12a is inserted into the cartridge body 11 are partition wall surfaces 11c, as shown in FIG. 11d is formed at the lower end of the partition wall surface 11c so that the ink in the ink storage chamber 11b is supplied in accordance with the ink consumed in the ink supply chamber 11a. At the lower end of the), an ink supply port 11e having a small piece of porous member 12b is formed.

On one wall surface of the cartridge body 11, the resilient portion 13 extends from the lower portion to the upper portion thereof, and the resilient portion 13 is provided with a first locking projection 13a and a handle 13b. Two second locking projections 13c are formed on the other wall surface.

The lid 14 is fused to the upper end of the cartridge body 11 to maintain airtightness, but the lid 14 has an air flow path 14a to maintain the internal pressure therein at the upper position of the ink supply chamber 11a. Is formed, and an injection hole 14b is formed at an upper position of the ink storage chamber 11b, and an airtight ball 14c is fitted in the injection hole 14b.

When the mixed ink cartridge 10 is mounted and used in the ink jet printer configured as described above, the ink of the ink storage chamber 11b penetrates the lower end of the porous member 12a of the ink supply chamber 11a. (11a) Printing is performed as ink is ejected through the printer head of the printer from the porous member 12b inserted into the ink supply port 11e at the lower end portion.

As the printing is performed as the ink is consumed, the ink of the ink storage chamber 11b is supplied through the hole 11d at the lower end of the partition wall 11c, so that the ink is always kept constant.

However, such a conventional ink cartridge has a problem in that it is economically burdened by the user because it is manufactured for one time and disposed of for one company, and the ink cartridge 10 is left for a long time in a state separated from the printer. Since the ink is evaporated and dried through the porous member 12b in the ink supply chamber 11a in the cartridge body 11 and the ink supply port 11e distributed therein, it solidifies as it is mounted in the printer and used again when the ink supply port 11e is used. There was a problem that would block the connection with.

An object of the present invention has been researched and developed in order to solve the above problems, the ink refilling method of the ink cartridge to re-use a predetermined amount of ink in the ink supply chamber and the ink storage chamber of the ink cartridge is completed ink consumption and To provide that kit.

In addition, an object of the present invention is to install the ink cartridge in the case when the ink cartridge is stored in the printer and stored so that the ink supply port portion of the ink cartridge is blocked from the air, thereby preventing the ink supply port from drying out An ink cartridge ink refilling method and a kit thereof are provided.

1 is a cross-sectional view showing a conventional ink cartridge,

2 is an exploded perspective view showing an ink refill kit of an ink cartridge according to the present invention;

3 is a partial cutaway perspective view showing only the case in FIG.

Figures 4a to 4f is a view showing the ink refilling process in the ink cartridge using the ink refill kit of the present invention,

Figure 4a is a cross-sectional view of the state to remove the airtight ball from the inlet of the ink cartridge of the present invention,

4B is a cross-sectional view of the ink cartridge mounted on the case of the present invention;

4C is a cross-sectional view of a state in which ink is injected into an ink supply chamber of the present invention;

4D is a cross-sectional view of a state in which ink is injected into an ink reservoir of the present invention;

Figure 4e is a cross-sectional view of the injection hole plug inserted into the inlet of the lid of the present invention,

4F is a perspective view showing an ink cartridge in which ink injection is completed;

Figure 5 is a cross-sectional view of the injection part capped state in the injection portion of the case in the ink refill kit of the present invention,

6 is a cross-sectional view of the auxiliary pad is mounted on the injection portion of the case in the ink refill kit of the present invention;

7 to 8 are views showing auxiliary pads applicable to the ink refill kit of the present invention.

<Explanation of symbols for main parts of drawing>

10: ink cartridge 11: cartridge body 11a: ink supply chamber

11b: ink reservoir 11c: partition wall 11d: hole

11e: ink supply holes 12a, 12b: porous member 13: elastic portion

13a: first locking projection 13b, 16b: handle 13c: second locking projection

14, 22: lid 14a: air flow path 14b, 23: inlet

14c: Confidential ball 16: Ball remover 16a: Screw

17, 25: injection hole plug 18: the first pad 19: ink container

19a, 21a: injection unit 20: case 21: temporary storage room

24: strip 26: support protrusion 27: pad mounting groove

28: guide protrusion 29a, 29b: locking step

The present invention for achieving the above object is to remove the airtight ball from the injection port formed in the lid of the ink cartridge is completed ink consumption, and the ink cartridge injecting the ink container in the porous member in the ink supply port Supplying ink to the ink supply chamber inside the cartridge body; Injecting ink into the ink supply chamber of the cartridge body and then turning it upside down and injecting ink into the ink storage chamber by inserting an injection portion of the ink container into an injection hole of the lid; The ink injection method of the ink cartridge is characterized in that it comprises the step of sealing the injection hole formed in the lid of the top of the ink cartridge is finished with the injection hole stopper.

In addition, in the process of injecting ink into the ink supply chamber of the ink cartridge, the end of the ink supply port is brought into close contact with a first pad having a through hole, and a predetermined amount of ink is inserted into the through hole of the first pad. The ink cartridge charging method of the ink cartridge is characterized in that.

In addition, the present invention is in contact with the ink supply end of the ink cartridge in the process of injecting ink into the ink supply chamber of the ink cartridge so that the ink is not leaked in close contact with the auxiliary pad formed with a funnel and supply a certain amount of ink to the funnel of the auxiliary pad In the ink cartridge refilling method of the ink cartridge to be naturally injected by the suction force of the porous member.

In another aspect, the present invention is a ball remover for removing and removing the airtight ball is inserted into the injection port of the lid fused to maintain the airtight on the top of the cartridge body constituting the ink cartridge; An injection hole stopper in which a pin is raised at the center of the disc to be sealed by being inserted into the injection hole of the lid of the ink cartridge; The ink cartridge and the ink cartridge refill kit is provided in the ink cartridge is provided with an ink container which is formed in a thin portion to be inserted into the injection port of the case side lid and capped the injection portion.

The ink container may use a syringe consisting of a cylindrical cylinder having a pointed injection portion formed in a pipe-shaped tip portion and a piston fitted in a state where the airtightness is maintained in the cylindrical cylinder, or a bellows type or spherical shape having a tip injection portion. It may be provided in a tube type.

In another aspect, the present invention is the case is mounted to the lower portion of the ink cartridge, the case is formed with a pad mounting groove for receiving the ink supply port and the temporary storage chamber having an injection portion circulated with the ink supply port through the pad mounting groove; In the ink cartridge refill kit, characterized in that the first pad is formed in the form of a flat plate to be mounted in the pad mounting groove of the case in close contact with the end of the ink supply port and the through-hole in which the injection portion of the case is inserted in the center is provided. .

In another aspect, the present invention is in the ink refill kit of the ink cartridge is provided with a tack-shaped injection portion plug which is inserted into the pad mounting groove of the case to the ink supply port of the ink cartridge so that the ink supply port of the ink cartridge is not dried. .

In another aspect, the present invention is an ink refill kit of an ink cartridge having a second pad formed with an injection-sealed groove to prevent the top of the injection portion of the temporary storage compartment in the pad mounting groove of the case.

In another aspect, the present invention is an ink cartridge refill kit of the ink cartridge, characterized in that the auxiliary pad is formed in the cap-shaped cross-section that is in close contact with the end of the ink supply port of the ink supply chamber constituting the ink cartridge is formed.

In another aspect, the present invention is in the ink cartridge refill kit of the ink cartridge, characterized in that the auxiliary pad having a funnel in the center of the upper end is formed of a cap-shaped cross section that is in close contact with the ink supply port of the ink supply chamber constituting the ink cartridge.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 to 5, the ink refill kit of the ink cartridge according to the present invention is the injection port 14b of the lid 14 fused to maintain the airtight on the top of the cartridge body 11 forming the ink cartridge 10 The ball remover 16 for removing the airtight holding ball 14c inserted in the plug, the injection hole plug 17 for closing and closing the injection hole 14b formed in the lid 14 of the ink cartridge 10, the ink cartridge The first pad 18 in close contact with the tip of the ink supply port 11e of the 10 and the through hole 18a formed therein, the through hole 18a of the first pad 18 and the injection port 14b of the lid 14. The ink cartridge 19 and the ink cartridge 10 in which the injection portion 19a is thinly formed so that the injection portion 19a is capped and the cap 19b is covered on the injection portion 19a, the ink cartridge 10 The case 20 is attached to the lower end part of the 10.

The ball remover 16 has a screw 16a formed to be inserted into the inlet 14b of the lid 14 to dig into the sealed hermetic ball 14c and has a cylindrical shape at the rear end thereof to hold it. The handle 16b is formed.

The injection hole plug 17 has a tack shape in which a pin is raised in the center of the disc to open and close the injection hole 14b of the lid 14 after injecting ink into the ink storage chamber 11b of the ink cartridge 10. .

The case 20 is provided in a rectangular box shape with an upper portion open to be mounted at a lower end portion of the ink cartridge 10, and a lid 22 is fused to have a temporary storage compartment 21 on one side of the lower portion. The ink injection portion 21a is formed at the upper portion of the temporary storage chamber 21 at a position in which the ink supply port 11e of the ink cartridge 10 is distributed. In addition, the lid 22 of the upper part of the temporary storage chamber 21 formed in the lower part of the case 20 is provided with an injection hole 23 for injecting ink therein, and one side of the lid 20 is formed of the same material as the lid 22. An injection hole stopper 25 for opening and closing the injection hole 23 is integrally formed at the end of the extended strip 24.

The case 20 has a support protrusion 26 for supporting the lower end of the ink cartridge 10 and a pad mounting groove 27 for accommodating the ink supply port 11e of the ink cartridge 10. A plurality of guide protrusions 28 for guiding both sides of the surface 10 are raised, and the left and right sides of the first locking protrusion 13a and the ink cartridge 10 are formed on the elastic part 13 of the ink cartridge 10. The locking step jaws 29a and 29b are formed to engage the locking projections 13c, respectively.

The first pad 18 is mounted in the pad mounting groove 27 of the case 20, and is formed in a disc shape having a through hole 18a formed in the center thereof so that the tip of the ink supply port 11e is in close contact with each other. It is desirable to provide this good rubber material.

The ink container 19 has a pointed injection portion 19b formed at the tip of the hollow cylindrical container 19a, and ink is filled in the inner space of the cylindrical container 19a, and the injection portion 19b is separated from each other. The cap 19c which can be put is covered.

The ink container 19 is shown and described in a bottle shape as shown in Figure 2, but consists of a cylindrical cylinder with a pointed injection portion formed at the tip of the pipe and a piston fitted in a state where airtightness is maintained in the cylindrical cylinder. A syringe can also be used and it can also be provided in the bellows type | mold or a spherical tube type | mold which has an injection part of a tip.

Although the first pad 18 is illustrated and described in a disc shape having a through hole 18a at the center, the first pad 18 may be formed so that the ink supply port 11e is not dried when the ink cartridge 10 is separated from the printer and stored. The second pad 180 has a shape in which the through hole 18a of the first pad 18 is closed, that is, the injection part sealing groove 181 is formed to block the upper end of the injection part 21a of the temporary storage chamber 21. It can also be prepared as shown in 5. In addition, as shown in FIG. 6, the first pad 18 is inserted into the injection portion 21a of the temporary storage compartment 21 of the case 20 in a state where the first pad 18 is mounted in the pad mounting groove 27 of the case 20 to close it. It may be provided as a separate injection part stopper 182.

The process of refilling ink in the ink cartridge 10 using the ink refill kit of the present invention having such a configuration will be described.

First, the screw (b) is held in a state where the handle 16b of the ball remover 16 is held on the airtight holding ball 14c inserted into the injection port 14b of the lid 14 of the ink cartridge 10 in which ink consumption is completed. When rotating while pressing and holding 16a), the screw 16a of the ball remover 16 digs into the airtight ball 14c and gets stuck. Thus, when the screw 16a of the ball remover 16 is firmly lodged in the airtight ball 14c, the ball remover 16 is pulled out so as to be stuck in the screw 16a of the ball remover 16 for airtightness. The ball 14c is pulled out of the inlet 14b of the lid 14.

In this way, the ink cartridge 10 having the airtight ball 14c removed from the inlet 14b of the lid 14 is provided, and the first pad 18 is mounted in the pad mounting groove 27 of the case 20. The prepared case 20 is provided.

The wall surface of the case 20 provided as described above is mounted on the case 20 so as to surround the lower end of the ink cartridge 10.

Referring to the process of mounting the ink cartridge 10 to the case 20 in more detail, the ink cartridge 10 to catch the engaging projection (13c) of the ink cartridge 10 on one end of the case (20b) Pushing one part of the inclined portion 10 obliquely and pressing the other part downward, the guide portion 28 of the inner surface of the case 20 is guided and the elastic portion 13 of the ink cartridge 10 faces the wall surface. Inserted while being pushed inward, when the locking projection 13a of the elastic part 13 reaches the locking end jaw 29a of the case 20, the elastic part 13 opens outwardly to its own elasticity and is returned to its original position. do.

At this time, the lower end of the ink cartridge 10 is supported by the support protrusion 26 of the case 20 and the end of the ink supply port 11e of the ink cartridge 10 is provided in the pad mounting groove 27 of the case 20. Since the upper surface of the mounted first pad 18 is coupled in a pressed state, airtightness is maintained.

The ink cartridge 10 assembled in the case 20 is turned upside down so that the lid 14 of the ink cartridge 10 is positioned at the bottom and the temporary storage compartment 21 of the case 20 is placed at the top. Insert the injection portion 19a of the ink container 19 into the injection hole 23 formed in the lid 22 of the case 20, inject a predetermined amount of ink, and then insert the ink container (from the injection hole 23 of the case 20). The injection part 19a of 19 is removed. At this time, the ink injection amount is enough to penetrate to the hole 11d formed in the separation wall between the ink storage chamber 11b and the ink supply chamber 11a.

Wait until the ink injected into the temporary storage chamber 11b of the case 20 is injected into the ink supply chamber 11a of the ink cartridge 10 through the injection portion 21a and the ink supply port 11e at the bottom thereof. The injection port 23 of the lid 22 is closed with an injection port stopper 25 to close it.

In this way, when the ink of the temporary storage chamber 21 is injected into the ink supply chamber 11a, the ink penetrates from the upper portion of the porous member 12b to the porous member 12a at the lower portion thereof, and at one side of the porous member 12a. Into the hole 11d of the dividing wall surface 11c located in the state, it is infiltrated.

In such a state, the lid 14 of the ink cartridge 10 is erected so that the lid 14 is positioned at the upper end, and the ink container 19 is inserted into the injection portion 19a of the ink container 19 in the injection hole 14b of the ink cartridge 10. Press the container portion so that a predetermined amount of ink is injected into the ink storage chamber 11b of the ink cartridge 10.

In this manner, after a predetermined amount of injection into the ink storage chamber 11b, the injection portion 19a of the ink container 19 is removed from the injection opening 14b of the lid 14 and the injection hole plug is inserted into the injection opening 14b of the lid 14. Insert (17) to seal it.

After completing the ink injection into the ink supply chamber 11a and the ink storage chamber 11b of the ink cartridge 10, the handle 13b formed on the elastic part 13 of the ink cartridge 10 is formed on the wall surface of the cartridge body 11. When pressed close to and separated from the locking step (29a) of the case 20 is separated so that the ink cartridge 10 is pulled out from the case 20 by pulling the ink cartridge 10 to the top.

Thus, after removing the ink cartridge 10 from the case 20, it may be mounted on the printer immediately.

As such, when the ink cartridge 10 is used and there is no plan to use the printer for a long time, and the ink cartridge 10 is to be separated and stored, the first pad 18 is mounted in the pad mounting groove 27 of the case 20. Is inserted into the injection part stopper 182 in the injection part 21a of the temporary storage compartment 21 in a closed state, and the ink cartridge 10 is removed from the printer, and the ink is recharged in the case 20 in the same manner as in the case of recharging ink. The ink cartridge 10 is mounted and stored. At this time, the end of the ink supply port (11e) of the ink cartridge 10 is in close contact with the upper surface of the first pad 18 to the injection portion plug 182 mounted on the case 20, the ink of the ink cartridge 10 The supply port 11e blocks the contact with air and thereby prevents ink drying at the ink supply port 11e portion.

6 is a cross-sectional view showing another example of the use of the ink cartridge 10 by using the ink refill kit of the present invention, the injection portion of the temporary storage chamber 21 in the pad mounting groove 27 of the case 20 ( 21a) The second pad 180 having the injection part sealing groove 181 formed thereon to block the upper end and the ink cartridge 10 in the case 20 in the same manner as when refilling the ink in the ink cartridge 10. ) Can also be stored.

7 to 8 are views showing the auxiliary pads used in the ink refill kit of the present invention, Figure 7 is formed with a cap-shaped cross-section that is covered on the outer surface so that the end of the ink supply port (11e) of the ink cartridge 10 is in close contact And an auxiliary pad 183 having a through hole 183a formed at the center thereof, and FIG. 8 is formed of a cap-shaped cross section which is covered with its outer surface so that the end of the ink supply port 11e of the ink cartridge 10 is in close contact. It is an auxiliary pad 184 having a funnel 184a at the center.

When the ink is to be injected into the ink supply chamber 11a of the ink cartridge 10 by using the auxiliary pads 183 and 184 configured as described above, the auxiliary pad 183 is disposed outside the ink supply port 11e of the ink cartridge 10. Put the cap-shaped cross section and insert the injection portion 19a of the ink container 19 into the through hole 183a, and then press a container portion of the ink container 19 to inject a predetermined amount or funnel 184a of the auxiliary pad 184. The outer surface of the ink container 19 may be pressed to pour the ink therein.

In this way, when the auxiliary pads 183 and 184 are used, the ink can be injected into the ink supply chamber 11a of the ink cartridge 10 without using the case 20 and the first and second pads 18 and 180. Will be reduced.

As described above, the ink refilling method and the ink refilling kit of the ink cartridge according to the present invention can be reused by recharging a predetermined amount of ink in the ink supplying chamber and the ink storage chamber of the ink cartridge, so that the ink consumption of the ink cartridge is relatively inexpensive. By purchasing only the ink, the ink cartridge can be used several times, thereby reducing the maintenance cost of the printer.

When the ink cartridge is separated from the printer and stored, the ink cartridge is mounted in the case and stored so that the ink supply port portion of the ink cartridge is blocked from the air by the first and second pads of the case. There is a peculiar effect that can prevent drying.

Claims (11)

The porous ball in the ink supply port 11e is removed after the air-retaining ball 14c is removed from the injection hole 14b formed in the lid 14 of the ink cartridge 10 where ink consumption is completed, and the ink cartridge 10 is turned upside down. Supplying ink to the ink supply chamber (11a) inside the cartridge body (11) by placing the injection portion (19a) of the ink container (19) on (12b); After the ink is injected into the ink supply chamber 11a of the cartridge body 11, it is turned upside down and placed upright, and the ink storage chamber 11b is inserted by inserting the injection portion 19a of the ink container 19 into the injection port 11b of the lid 14. Injecting ink into the furnace; The method of refilling the ink cartridge, characterized in that the process of sealing the injection hole (14b) formed in the lid 14 of the top of the ink cartridge 10, the ink injection is completed with the injection hole stopper (17). The method of claim 1, wherein in the process of injecting ink into the ink supply chamber (11a) of the ink cartridge 10, the end of the ink supply port (11e) is in close contact with the first pad (18) having a through hole, A method of refilling an ink cartridge, comprising inserting a predetermined amount of ink into a through hole of a pad (18) to insert an injection portion (19a) of an ink container (19). According to claim 1, wherein in the process of injecting ink into the ink supply chamber (11a) of the ink cartridge 10, the auxiliary funnel is formed while in close contact with the ink does not leak from the end of the ink supply port (11e) of the ink cartridge 10 An ink cartridge refilling method of an ink cartridge in which pads are brought into close contact with each other and a certain amount of ink is supplied to a funnel of the auxiliary pad to be naturally injected by suction force of the porous members 12a and 12b. Ball remover 16 for removing and removing the airtight holding ball 14c inserted in the inlet 14b of the lid 14 fused to maintain the airtightness on the upper end of the cartridge body 11 constituting the ink cartridge 10. ; An injection hole stopper 17 in which a pin is raised at the center of the disc to be sealed by being inserted into the injection hole 14b of the lid 14 of the ink cartridge 10; A first pad 18 formed in a flat plate shape so as to be in close contact with the tip of the ink supply port 11e of the ink supply chamber 11a constituting the ink cartridge 10 and having a through hole 18a formed at the center thereof; The injection portion 19a is formed thin so as to fit into the injection holes 14b and 23 of the ink cartridge 10 and the case 20 side lids 14 and 22, and the cap 19b is covered with the injection portion 19a. Ink refill kit of an ink cartridge, characterized in that the ink container 19 is provided. The pad mounting groove 27 is formed on the lower end of the ink cartridge 10 and receives the ink supply hole 11e, and the ink supply hole (27) is formed through the pad mounting groove 27. 11e) and the ink refill kit of the ink cartridge, characterized in that the case 20 is provided with a temporary storage chamber 21 having an injection portion (21a) in circulation. According to claim 4 or 5, It is formed in the shape of a flat plate mounted in the pad mounting groove 27 of the case 20 in close contact with the end of the ink supply port (11e) and the injection portion of the case 20 in the center An ink refill kit for an ink cartridge provided with a first pad (18) having a through hole (18a) into which (21a) is fitted. The method of claim 5, wherein the injection portion (21a) of the case 20 in the pad mounting groove 27 of the case 20 so that the ink supply port (11e) of the ink cartridge 10 is not dried, the first pad ( 18) An ink cartridge refilling kit for an ink cartridge provided with a tack-shaped injection portion stopper 182 fitted thereto. The second pad 180 of claim 5, wherein the pad mounting groove 27 of the case 20 has an injection part sealing groove 181 formed therein so as to block an upper end of the injection part 21a of the temporary storage chamber 21. ) Ink refill kit of the ink cartridge. The auxiliary pad of claim 4, wherein the end of the ink supply chamber 11a of the ink cartridge 10 is formed in a cap-shaped cross section in which an end of the ink supply port 11e is covered in close contact, and a through hole 183a is formed at the center thereof. 183) is provided with an ink cartridge refilling ink cartridge. The auxiliary pad according to claim 4, wherein the end of the ink supply port (11a) of the ink cartridge (10a) is formed in a cap-shaped cross section which is covered in close contact with a funnel (184a) at the center of the upper end thereof. Ink cartridge refill kit, characterized in that 184 is provided. The ink container according to claim 4, characterized in that the ink container (19) is provided with a syringe formed of a cylindrical cylinder having a pointed injection portion formed at a tip of a pipe and a piston fitted in a state where airtightness is maintained in the cylindrical cylinder. Cartridge ink refill kit.