KR200268763Y1 - Ink-refilling unit for ink cartridge of a jet printer - Google Patents

Abstract

The present invention relates to an ink refill unit for an ink cartridge of a jet printer composed of an ink cylinder, a vacuum cylinder, a leak prevention ring, and the like; The ink cylinder is refilled with ink to refill the ink into the ink cartridge, and at one end of the ink cylinder, the injection nozzle is initially connected with the injection hole of the ink cartridge; Use two fingers of one hand to press the finger-press plate under the ink cylinder, the other hand holds the outer side of the vacuum cylinder, and can pull the vacuum cylinder up to create a vacuum inside the refill unit; Thereafter, air bubbles are sucked out of the ink sponge of the ink cartridge, and the ink-refill process will be started due to the negative pressure inside the ink cartridge.

Description

Ink refill unit for ink cartridge of jet printer {INK-REFILLING UNIT FOR INK CARTRIDGE OF A JET PRINTER}

The present invention relates to an ink cartridge of a jet printer, in particular an ink refill unit for an ink cartridge of a jet printer.

In conventional jet printers, the ink is contained in the cartridge, and the ink ejected onto the printing paper is adjusted with a nebulizer; When the ink inside the cartridge is used up, the cartridge must be replaced for further printing operation; Ink cartridges supplied by early manufacturers are too expensive, and users who have to print a lot of paper will have to pay a lot of money.

In an ink cartridge of a conventional jet printer, the ink chamber of the ink cartridge is filled with the same air bladder or sponge to absorb and supply ink. The ink cartridge supplied by the initial manufacturer has the same pressure inside the ink chamber during the automatic manufacturing process and will not leak during printing.

In a conventional ink cartridge filled with a sponge, the empty ink cartridge can be refilled by sealing and closing the end opening of the discharge port by glue; Thereafter, the center through hole in the lid of the upper surface of the ink cartridge is sealed with one film; The syringe sucks in the right amount of ink. A thin, cavity needle is used to penetrate the membrane at the bottom and through holes of the storage chamber to inject ink into the storage chamber; However, the sponge in the storage chamber contains a large amount of foam, and the injected ink cannot be used to exhaust air; As a result, the ink injected therein is limited. Because of the mesh provided between the storage chamber and the second chamber, if the air inside the second chamber is not discharged, the ink in the storage chamber cannot enter the second chamber through the mesh and the ink can flow into the injection chamber. none.

When the ink cartridge fails to print continuously in the printer, the main cause is that the sprayer does not sufficiently supply ink in the print head, and there is a shortage of ink flowing through the passage formed by the bearing member; That is, if too much air enters the second chamber at the printing head, this air enters the storage chamber of the sprayer to block the ink and no ink is ejected out; If the ink is not ejected out of the sprayer for a considerable time, the sprayer may burn.

In prior application 09 / 328,378 entitled 'Devices for Ink Cartridges of Jet Printers', comprising an ink-storage container and a cylinder; The ink-storage container has a cylindrical body portion, the bottle mouth of which has retaining rings and screw screws to be connected with the piston ring and the threaded tab respectively for storing ink; One end of the cylindrical body portion includes an outer body portion having a long diameter; The cylindrical body portion and the inner cylinder of the cylinder are assembled together; The piston ring of the bottle mouse is in contact with the inner cylinder; The front end of the sealed surface of the cylinder has an ink straw that is narrowed to fit in with the through hole of the ink cartridge; Secure the outer side of the cylinder, and then the thumb pushes up the shoulder portion of the ink-storage container to generate negative pressure to refill the ink with the ink cartridge.

The main feature of the present invention is an improvement of the 'apparatus for ink cartridges of a jet printer' of application 09 / 328,378; The ink is stored in a separate ink cylinder, the upper end having a leak-proof ring to be connected with the cylinder body of the vacuum cylinder. When refilling the ink cartridge, the inlet nozzle should be connected to the inlet of the ink cartridge; Two fingers of one hand press on the finger-press plate, and the other hand holds the other side of the vacuum cylinder to pull up to vacuum the interior of the refill unit; Thereafter, air bubbles are blown out of the ink sponge of the ink cartridge, and a negative pressure inside the ink cartridge will cause the ink to be filled therein.

According to another feature of the present invention, a leak-proof ring is provided between the ink cartridge and the vacuum cylinder, and the center of the leak-proof ring has one through hole. The post hole of the vacuum cylinder mounted on the ink cartridge is firmly connected with the leak-proof ring. When pulling up the vacuum cylinder, the interior of the vacuum cylinder creates a vacuum to empty the air inside the ink cartridge; Fill the ink inside.

According to another feature of the present invention, a retaining ring is provided at the upper end of the cylinder body of the ink cylinder, which is connected with the leak-proof ring. The outer surface of the ink cylinder has a plurality of ribbed plates, which can prevent the vacuum cylinder from biasing when pulled over the ink cylinder.

According to another feature of the present invention, the lower end of the ink cylinder has a finger-press plate which can be pressed by two fingers. The vacuum cylinder mounted on the ink cylinder can be pulled out by hand to create a vacuum inside the vacuum cylinder. The lower end of the vacuum cylinder has a limit ring to prevent the vacuum cylinder from accidentally detaching the ink cylinder.

According to another feature of the present invention the bottom of the finger press plate comprises two symmetrical lugs and a cylindrical portion; The finger press plate can be pressed so that the cylindrical portion passes through the connection hole of the protective box; After that the lugs are fitted to the retaining grooves of the protective box; The open space at the other end of the protective box is connected with the ink cartridge so that the ink cartridge can be safely refilled.

According to another advantage of the present invention, the post hole in the vacuum cylinder has a short post; When the refill unit is not used, the short post is inserted into the through hole of the leak-proof ring at the upper end of the ink cylinder so that the ink is stored and sealed in the inner cylinder of the ink cylinder.

According to another advantage of the present invention, the center of a short post in a vacuum cylinder has one post hole, which is closed by a hole plug so that ink does not leak. After the refill operation, the hole plug can be pulled out by pulling the pull plate, after which the post hole is used as the refill hole to fill the ink in the ink bottle into the ink cylinder; The refill unit can be used repeatedly.

1 is a perspective view of the present invention, showing a refilling operation by an ink cartridge and an ink-jet cylinder;

Figure 2 is a cross-sectional view of the present invention, showing the internal structure of the ink cartridge.

Figure 3 is an exploded view of the present invention, showing the assembled structure of the refill unit.

4 is a cross-sectional view of the present invention, showing the assembled structure of the refill unit.

5 is a cross-sectional view of the present invention, showing the relationship between the refill unit and the ink cartridge.

Figure 6 is a cross-sectional view of the present invention, showing the operating state of the refill unit.

7 is a cross-sectional view of the present invention, showing a refill unit for refilling ink.

8 is a perspective view of the present invention, showing a connection relationship between a refill unit and a protective box.

9 is a cross-sectional view of the present invention, showing a connection relationship between a refill unit and a protective box.

1 to 2, the ink cartridge 11 of the Epson color jet printer SO20110 is shown. The interior space of the ink cartridge 11 body portion 12 includes a plurality of separate ink-storage chambers 15 according to different ink colors; Every ink-storage chamber 15 has a sponge 20; The lower part of all the ink-storage chambers 15 has a mesh 19 to separate the second chamber 16 so that impurities of ink do not enter the second chamber 16 inside the ink-storage chamber 15. ) Is mounted. By the siphon effect, ink can flow into the second chamber 16 of each ink-storage chamber 15; The second chamber 16 is not large. When the ink cartridge 11 is assembled, the sealing gasket 17 is mounted in the second chamber 16 at the discharge port of the ink cartridge 11; End openings are sealed with a separation membrane 18, after which the sponge 20 is filled in the ink-storage chamber 15 of all body portions 12. The upper portion of the body portion 12 is sealed with a cap, the upper surface 28 of which has a plurality of grooves 22 according to a corresponding number of ink-storage chambers 15. The tail end of every groove 22 has a through hole 25 in communication with the chamber 15 and another through hole 24 for resupplying ink, and the top surface 28 has two through holes 24 and 25. Has; The main purpose of this is that the through hole 24 is used to insert the ink needle into the sponge 20. The ink needle and the through hole 24 are joined together by welding; The other end of the through hole 25 is joined by welding with an independent connector of the vacuum suction assembly. The ink will be directed to flow into the sponge 20 from the ink-storage chamber 15 of the ink cartridge 11 by the vacuum suction force of the vacuum suction assembly, while at the same time the air inside the sponge 20 and the second chamber 16 All will be consumed. After the top surface 28 of the cap in the ink cartridge 11 is sealed with the membrane 23 and sealed, two through holes 24 and 25 and the groove 22 will be formed into the passage 27. The ink storage chamber 15 of the ink cartridge 11 will communicate with the atmosphere through the thin passage 27. In the ink-storage chamber 15, the sponge 20 functions to balance the internal pressure of the ink-storage chamber 15 and to absorb ink. Before the ink cartridge 11 is used, the passage 27 of the upper surface 22 prevents ink from leaking. After the ink cartridge 11 and the printer are assembled together, the separation membrane 18 attached to the discharge port will be penetrated by the guide straw of the connecting sheet; Thereafter, the welding gasket 17 of the discharge port will contact the guide straw of the connecting sheet. The ink absorbed in the sponge 20 of the ink-storage chamber 15 is printed until the sponge 20 cannot supply ink through the mesh 19 and enter the second chamber 16. When consumed and reduced; After that, the ink cartridge must be replaced with a new one to continuously supply ink to the printer.

In practice, the separation membrane 18 attached to the discharge port will be destroyed when supplying ink for the ink cartridge 11 back to the sponge 20. After the ink cartridge 11 is separated from the connecting sheet of the printer, air will enter the second chamber 16 of the ink cartridge 11. When the ink is refilled, the discharge port of the ink cartridge 11 should be closed with a glue 62 that is adhered to the separation membrane 18. In order to properly seal the discharge port of the ink cartridge 11, the protection clamp 14 is used during the resupply of ink to accurately seal the discharge port.

1 to 6, a refill unit is provided for an ink cartridge of a jet printer according to the present invention; After emptying the ink cartridge 11, the outlet of the second storage chamber 16 of the ink cartridge 11 is sealed with a glue 26; Thereafter, the outlet of the ink cartridge 11 is fixed with the protective clamp 14 so that ink does not leak from the outlet. The inflow nozzle 34 at the front end of the refill unit 13 can be used to pass the membrane 29 in the through hole 25 of the ink cartridge 11 after the ink cartridge 11 is fixed in place; The inlet nozzle 34 and the through hole 25 are then sealed in contact; Use two fingers of one hand to press the finger-press plate 40 under the ink cylinder 31, and the other hand to hold the vacuum cylinder 32 and apply negative pressure inside the vacuum cylinder 32. Pulling up the vacuum cylinder 32; In this case, air in the storage chamber 15 of the ink cartridge 11 will be sucked into the hollow space 51 at the top of the ink cylinder 31. As soon as the traction force of the vacuum cylinder 32 is removed, the ink inside the ink cylinder 31 will flow by the vacuum effect to fill the ink into the ink sponge 20 in the storage chamber 15 of the ink cartridge 11.

3 to 6, the refill unit 13 includes an ink cylinder 31 and a vacuum cylinder 32; The ink cylinder 31 has a cylinder body 42, the center of which has an inner cylinder 41; The upper end of the inner cylinder 41 has a retaining ring 44 to be connected with the leak-proof ring 33 to connect with the retaining groove 47. The outer face of the cylinder body 42 has a plurality of symmetric ribbed plates 43; The lower end of the cylinder body 42 has two symmetrical finger-press plates 40; The lower part of the finger press plate 40 has a short cylindrical post 37 in which two symmetrical lugs 38 extend horizontally. The center of the cylindrical post has an inlet nozzle 34, which will be installed in the end plug 36. After the vacuum cylinder 32 is mounted on the outer side of the ink cylinder 31, the inner cylinder 50 will be in sealing contact with the leak-proof ring 33 at the upper end of the ink cylinder 31; Upper and lower ends of the cylinder body 49 are provided with two sliding stops 52 and 53, respectively. The outer face of the cylinder body 49 is a handle 54 that can be gripped by the user. When pulling up the vacuum cylinder 32, the interior of the vacuum cylinder 32 will be in a vacuum to provide a force for the ink cartridge when refilling the ink.

1, 3 to 6, the ink cylinder 31 of the refill unit 13 includes a cylinder body 42, a retaining assembly 67 and a leak-proof ring 33; The cylinder body 42 is a rectangular cylinder, and the hollow space of the cylinder is used as the ink-storing space 66. The outer edge of one end of the cylinder body 42 has a retaining ring 44 to connect with the leak-proof ring 33; The other end of the cylinder body 42 has a retaining assembly 67 to connect with the inlet of the ink cartridge, so as to connect with the protective box 65 when refilling the ink. One end of the ink cylinder body 42 of the ink cylinder 31 has a stop ring 68 and a retaining ring 44. The retaining ring 44 is connected with the leak-proof ring 33; The stop ring 68 under the retaining ring 44 is used to prevent the leak-proof ring 33 from slipping, ie to secure the ring 33 in place.

The cylinder body 42 of the ink cylinder 31 is mounted to the inner cylinder 50 of the vacuum cylinder 32; The outer surface of the cylinder body 42 has a plurality of ribbed plates 43 to easily move the vacuum cylinder 32 without bias. The ribbed plate 43 extends downwards from the stop ring and has a constant gap between the minimally reduced vacuum cylinder 32 and the ink cylinder.

The lower end of the cylinder body 42 has a retaining assembly 67, which includes a symmetric finger-press plate 40, a cylindrical portion 37, two symmetrical lugs 38 and an inlet nozzle 34. do. At one end of the cylindrical body 42 the cylindrical portion 37 extends out of the inner cylinder 41 of the cylindrical body 42, the center of which has one through-hole 69, which is an inlet nozzle. 34 is the passage. The finger-press plate 40 above the cylindrical portion 37 extends in two symmetrical planes of the cylinder body 42, the upper face of which is a wide and flat surface; While refilling the ink, two fingers of the user can press the plate 40 to stop the ink cylinder 31 in place. The cylindrical portion 37 under the finger press plate 40 has an inlet nozzle 34, the outer circumference of which is sealed between the inlet nozzle 34 and the through hole 25 of the ink cartridge 11. It is designed to fit the inner circumference of the ink cartridge 11 through hole 25 for connection.

For a secure and safe connection while refilling the ink cartridge 11, the outer end of the cylindrical portion 37 of the cylinder body 42 has two symmetrical lugs 38 formed in a circle; As shown in FIGS. 7 to 9, the lug is engaged with the connecting hole 63 of the protective box 65, that is, the lug 38 passes through the retaining groove 64 of the connecting hole 63, and then the ink cylinder. The retaining assembly 67 of 31 and the protective box 65 rotate to be connected. The inlet nozzle 34 passes through the connecting hole 63 of the protective box 65, that is, the lug 38 passes through the retaining groove 64 of the connecting hole 63 and then the protective box 65 Rotate to engage with the retaining assembly 67 of the ink cylinder 31. The inlet nozzle 34, which passes through the connection hole 63 of the protective box 65, allows for easy connection with the through-hole 25 of the ink cartridge 11 during refilling for a safe and secure connection. Extends into the cavity of the cavity.

The retaining portion 67 under the finger-press plate 40 has a cylindrical portion 37, the center of which comprises the inlet nozzle 34. As shown in FIGS. 5 and 6, the inlet nozzle 34 of the ink cylinder 31 can directly connect with the through hole 25 of the ink cartridge 11, and the lugs 38 are used in the cylindrical portion 37. Not so; In the cylindrical portion 37 lugs 38 may be omitted.

As shown in FIGS. 7 to 9, the retaining assembly 67 of the ink cylinder 31 is connected with the protective box 65. The retaining assembly 67 of the ink cylinder 31 requires lugs 38 on both sides of the cylinder 37 to impart a retaining function after connection; That is, no leakage and splash of ink occurs after the inflow nozzle 34 is connected with the through-hole 25 of the cartridge for refilling.

The vacuum cylinder 32 mounted to the ink cylinder 31 has a shorter cylinder body 49, which has an inner cylinder 50 in contact with the leak-proof ring 33 of the ink cylinder 31. Have; The lower end of the inner cylinder 50 has a limit ring 62 which prevents the ink cylinder 31 and the vacuum cylinder 32 from being separated from each other when the vacuum cylinder 32 moves normally. The upper and lower ends of the cylinder body 49 are provided with two symmetrical slip stops 52 and 53, respectively, which can prevent the user's hand from slipping when pulling the vacuum cylinder 32; This is valid even when negative pressure occurs in the inner cylinder 50 while pulling the vacuum cylinder 32, ie the hand does not feel slippery.

One end of the inner cylinder 50 of the vacuum cylinder 32 in contact with the ink cylinder 31 is a circular opening end and the other end is a closed end, the center of which is normally closed through the hole plug 30. It has a short post 55 with a hole 56. After the vacuum cylinder 32 and the ink cylinder 31 are joined together, the inner cylinder 50 and the leak-proof ring 33 of the ink cylinder 31 will contact together; Thereafter, the ink filled inside the ink cylinder 31 does not leak due to the inflow nozzle 34 closed by the end plug.

The post hole 56 at the upper end of the vacuum cylinder 32 has a short post 55 extending into the inner cylinder 50 to extend the post hole 56. As shown in Fig. 4, the inflow nozzle 34 of the ink cylinder 31 is closed with the end plug 36 before filling the ink with the refill unit 13; The other end of the ink cylinder 31 is mounted together with the vacuum cylinder 32, and the short post 55 of the post hole 56 will fit into the through hole 48 of the leak-proof ring 33; The outer side of the short post 55 will contact the through hole 48 of the leak-proof ring 33; Thereafter, the post hole 56 of the vacuum cylinder 32 will communicate with the inner cylinder 41 of the ink cylinder 31. When refilling ink, the connecting nozzle can be inserted directly into the inner cylinder 41 of the vacuum cylinder 32 to speed up the refilling operation. As soon as the refilling operation is finished, after closing the post hole 56 of the vacuum cylinder 32 by using the hole plug 30 of the pulling plate 58, the refilling operation of the refilling unit 13 is completed. The two ends of the refill unit 13 are closed by the end plugs 36 and the hole plugs 30 so as not to leak during transportation or processing.

While refilling the ink cartridge, as shown in Figs. 4 to 6, after the end plug 36 of the ink cylinder 31 is first removed, the inflow nozzle 34 penetrates the ink cartridge 11 so that the connection surface is in contact. It fits into the hole 25. As shown in Figs. 7 to 9, at one end of the ink cylinder 31, the retaining assembly 67 is secured to firmly engage with each other until the inlet nozzle 34 is connected with the through hole 25 of the ink cartridge 11; It passes through the connection hole 63 of the box 65. As shown in FIG. 1, using two fingers of one hand and pressing the finger-press plate 40 at the lower side of the ink cylinder 31, the other hand is used to pull the vacuum cylinder 32 upwards. Maintain the cylinder body 49; As shown in Fig. 6, the closed space between the refill unit 13 and the ink cartridge 11 will increase, and negative pressure is generated in this closed space; As a result, the ink inside the refill unit 13 will be refilled inside by negative pressure and convection effects.

After the vacuum cylinder 32 of the refill unit 13 is pulled to move, a negative pressure will be generated in the closed space; In this case, the user's hand will feel the presence of vacuum suction force; Significant traction will occur between the ink cylinder 31 and the vacuum cylinder 32. Slip stops 52 and 53 at both ends of the cylinder body 49 of the vacuum cylinder 32 are used to prevent the hand from slipping during the towing operation. When pulling the vacuum cylinder 32, the space with the cavity between the ink cartridge 11 and the vacuum cylinder 32 will generate negative pressure; In the ink sponge 20 of the ink cartridge 11, air is absorbed into the vacuum cylinder 32 and at the same time the closed space is placed in a negative pressure state; After that, the air in the upper portion of the ink cylinder 31 will be increased. As soon as the vacuum cylinder 32 of the refill unit 13 is released, the vacuum cylinder 32 is pulled back due to negative pressure, and the ink inside the ink cylinder 31 is sucked into the ink sponge 20 so that the ink cartridge ( 11 will be absorbed by vacuum force into the storage chamber 15. Repeatedly pulling the vacuum cylinder 32 of the refill unit 13 until no more ink is absorbed out of the ink cartridge 11; After that, the refill operation will be made by a vacuum convection method; At the same time, the air bubbles inside the ink sponge 20 will be blown out by the vacuum force. After the ink cartridge 11 is filled with ink, the through holes 25 of the storage chamber 15 must be glued to cover the membrane 23 in the through holes 25 to restore the original function of the passage 27. do.

In FIG. 7, when the ink inside the refill unit 13 is exhausted or insufficient during the refill operation, the hole plug 30 in the vacuum cylinder 32 passes through the ink hole through the post hole 56 of the vacuum cylinder 32. It must be withdrawn by holding the pull plate 58 to refill ink to 59; The connecting portion 61 of the bottle cap 60 is connected with the post hole 56 of the vacuum cylinder 32 so that the ink inside the ink bottle 59 fills the ink cylinder 31 of the refill unit 13; The refill unit 13 can be used repeatedly.

One end of the ink cylinder 31 according to the present invention has an inlet nozzle 34 and the other end has a leak-proof ring 33, on which the vacuum cylinder 32 is installed. . One end of the vacuum cylinder 32 has an ink-inlet hole for filling ink after the ink cylinder 31 and the vacuum cylinder 32 are connected together. In order to fill ink with the ink cartridge 11, the user uses two fingers of one hand to press the finger press plate 40 at the lower end of the ink cylinder 31, and the other hand with the refill unit 13 Fixing the cylinder body 49 of the vacuum cylinder 32 to generate a negative pressure in the closed space between the ink cartridges 11 and to pull up to blow air inside the ink cartridges; When the vacuum cylinder 32 returns to the equilibrium state, the ink inside the ink cylinder 31 will be filled into the storage chamber 15 of the ink cartridge 11 and will be absorbed in the ink sponge 20; After multiple pulls, no bubbles or air will remain in the second storage chamber 16 and ink sponge 20 of the ink cartridge 11. According to the detailed description of the embodiments herein, the structure of the ink-injection cylinder and the features of the ink refill method for the ink cartridge have been completely described, and the present invention is novel and greatly improved; This feature could not be expected or achieved by any inventor in the art.

Claims (11)

An ink cylinder having a rectangular cylinder body and a cavity spaced in an inner cylinder for storing ink; One end of the cylinder body has a retaining ring connected with the leak-proof ring and the outer edge of the other end has a finger-press plate; The tail end of the cylinder body has an inlet nozzle; A leak-proof ring having a through hole in the center and having a retaining groove connected to a retaining ring at one end of the cylinder body; The vacuum cylinder is a rectangular cylinder, the center has an inner cylinder, and one end is an open end mounted over the ink cylinder; The inner cylinder of the vacuum cylinder is in contact with the leak-proof ring of the ink cylinder; The center of the closed end of the cylinder body has a post hole which is sealed with a hole plug after filling the ink; A hole plug mounted in a post hole at the center of the closed end of the cylinder body of the vacuum cylinder; An ink-refill unit for an ink cartridge of a jet printer comprising an end plug mounted to an inlet nozzle at the center of one end of the vacuum cylinder. 2. An ink cartridge according to claim 1, wherein an outer surface of one end of the ink cylinder of the refill unit has a retaining ring, below which a stop ring is provided; And the retaining ring is connected together with a leak-proof ring having a retaining groove. 2. The jet of claim 1, wherein the outer surface of the cylinder body of the ink cylinder has a plurality of longitudinal rib shaped plates, which extend from the bottom of the stop ring to the top of the finger-press plate. Ink-refill unit for the ink cartridge of the printer. The ink cartridge of claim 1, wherein the outer surface of one end of the cylinder body of the ink cylinder has a symmetric finger-press plate, and a short cylindrical portion is provided below it. Ink-Refill Unit. 2. The inkjet printhead of claim 1 wherein the outer side of one end of the cylinder body of the ink cylinder has a symmetric finger-press plate, below which the short cylindrical portion has two symmetric lugs; Wherein the finger-press plate, the cylindrical portion and the symmetrical lug are formed in a retaining assembly, which is connected together with a connection hole of a protective box. The ink-refill unit for an ink cartridge of a jet printer according to claim 1, wherein the closed end of the inner cylinder of the vacuum cylinder of the refill unit has no post hole. The closed end of the inner cylinder of the vacuum cylinder of the refill unit has a short post having a post hole in the center; The post hole is closed with a hole plug; The short post is inserted into the through hole at the center of the leak-proof ring of the ink cylinder; An ink refill unit for an ink cartridge of a jet printer, wherein the outer side of the short post is in contact with the through hole of the leak-proof ring. 2. An ink refilling unit for an ink cartridge of a jet printer according to claim 1, wherein the hole plug for closing the post hole at the closed end of the vacuum cylinder has a pull plate for easily removing the hole plug. The ink cylinder is a rectangular cylinder body, the center of which has an inner cylinder with a cavity for storing ink; The outer surface of one end of the cylinder body has a retaining ring for connecting with the leak-proof ring; The other end of the cylinder body has a retaining ring to connect with the leak-proof ring; The other end of the cylinder body has a finger-press plate, and the tail end of the cylinder body has an inlet nozzle in the center; Having a leak-proof ring mounted to the retaining ring at one end of the cylinder body of the ink cylinder by a retaining groove in the leak-proof ring; The leak-proof ring has a through hole at its center; The vacuum cylinder has a rectangular cylinder body, the center of which has an inner cylinder, and one end is an open end mounted to the ink cylinder; An ink refill unit for an ink cartridge of a jet printer, wherein the inner cylinder of the vacuum cylinder is in contact with a leak-proof ring mounted at the end of the ink cylinder. The ink of a jet printer according to claim 9, wherein the closed end of the inner cylinder of the cylinder body of the vacuum cylinder in the refill unit has a short post having a post hole at its center, and the post hole is sealed with a hole plug. Ink refill unit for cartridge. 10. The apparatus of claim 9, wherein one end of the cylinder body of the vacuum cylinder in the refill unit has a symmetric finger-press plate; The short cylindrical portion provided under the finger press plate has two symmetric lugs; A retaining assembly comprising a finger-press plate, wherein the cylindrical portion and the symmetrical lug and retaining assembly are connected together with a connection hole of a protective box.