KR0133921Y1 - Air valve of printing head capping apparatus for ink jet printer - Google Patents

Abstract

The present invention relates to an air valve for a capping device of an ink jet printer, and more particularly, to a print head capping device of an ink jet printer operated by a slide means horizontally reciprocating by a separate drive motor. An air valve, comprising: a cap means for performing only a vertical reciprocating motion and a wiper means; a capping device comprising a slider means for inducing a vertical reciprocating motion of the cap means and the wiper means, the slider plate being a movable part of the slider means. The pressing means is formed on one side of the valve means, and the valve means is installed on one side of the guide body which is a fixed portion of the slider means.

The air valve structure for the print head capping device of the ink jet printer according to the present invention has the effect of reducing the volume of the device by opening and closing the air passage without horizontal movement of the cap means, and the valve cover and the conical elastic cylinder surrounding the rubber valve. The rubber valve has a feature to prevent the entry of foreign substances from the outside by double sealing the air hole communicating with the inside of the rubber cap.

Description

Air valve structure for print head capping device of ink jet printer

1 is a plan sectional view schematically showing a configuration of a print head capping device employing an air valve means for a print head capping device of an ink jet printer according to the present invention.

2 is a partially cutaway perspective view illustrating the structure of an air valve means for a print head capping device of an ink jet printer according to the present invention.

3 is a plan sectional view showing a coupling relationship of the air valve means for the print head capping device of the ink jet printer according to the present invention.

Figure 4 is an explanatory view showing the operation of the air valve for the print head capping device of the ink jet printer according to the present invention.

* Explanation of symbols for main parts of the drawings

11 cap means 12 rubber cap

18: slide vertical rod 18: horizontal protrusion

20: coil spring 21: wiper means

22: guide 24: guide home

32: slide plate 34: guide

36: guide body 52: rotary gear

54: connecting lever 63: planetary gear

64: sun gear 65: connection rod

66: first connecting gear 74: second connecting gear

84: pump gear 101: air valve means

102: pressing part 104: air valve

110: rubber valve 112: elastic cylinder

114: valve hole 117: air hole

118: air valve support wall 119: air distribution pipe

122: push pin 126: support wall

The present invention relates to an air valve for a capping device of an ink jet printer, and in particular, is operated by a slide means horizontally reciprocating by a separate drive motor, and is simple in structure and easy to manufacture. An air valve for a print head capping device of an ink jet printer.

An ink jet printer is an output device that prints an image or a character on a paper surface while a print head carrier equipped with an ink cartridge moves the paper surface horizontally in accordance with an output signal. An ink cartridge for discharging the stored ink through the formed nozzle, a print head carrier on which the ink cartridge is seated and transported, a shaft for guiding the print head carrier, a timing belt for transferring the print head carrier along the shaft, and timing It consists of a drive motor and a drive pulley for driving the belt.

An ink jet printer finely sprays printing ink onto printing paper through a nozzle formed on the print head of the ink cartridge to print predetermined characters or images. However, when the nozzle of the printhead is exposed to the air for a long time without performing a printing operation, the ink on the surface is solidified and clogged. In this way, clogging of the nozzle causes a problem that printing is impossible or the printed characters are unclear.

Therefore, in order to prevent the nozzle of the print head from clogging, the ink jet printer should be covered with a rubber cap while the print head is not being used. In this way, a device for sealing or releasing the nozzle portion of the print head with the rubber cap is provided. It is called a capping device.

In general, the print head capping apparatus includes a cap means 11 for sealing the print head and a wiper means 21 for wiping out ink or dust remaining on the print head, wherein the cap means 11 is printed. A rubber cap 12 for enclosing and sealing the nozzle part of the head and the rubber cap 12 are fixed to each other, and an air flow path 15 and a residual ink flow path 16 are provided on one side thereof. It consists of a coupling portion for fixing or supporting the cap 14.

The cap means 11 should be moved up and down to seal or open the print head. In general, the cap means 11 drives the cap means 11 without a separate dedicated motor and a separate dedicated motor. There is a method using the horizontal movement force of the print head carrier carried by the timing belt.

When the cap means 11 is raised by any driving means, the rubber cap 12 encapsulates the print head and conversely, when the cap means 11 is lowered, the rubber cap 12 is the print head. It will be detached from and the capping is released. However, in this case, when the vacuum is formed in the space formed by the rubber cap 12 and the print head, the rubber cap 12 may not be separated smoothly. In particular, when the remaining ink is pumped through the residual ink flow path 16 to remove the remaining ink in the rubber cap 12, a strong vacuum is formed in the rubber cap 12, so that the separation of the cap becomes difficult. In order to exclude such a shape, it is necessary to open the air passage or blow air into the air passage before removing the rubber cap.

The air valve related to the present invention is to open and close the air flow path as described above, although there were various types of air valves in the past, most of them were complicated or coarse in structure. For example, a conventional air valve is composed of an air distribution tube extending a rubber tube formed in a cap part and a pin inserted into the rubber tube to seal the air distribution tube.

Such a conventional air valve is not only difficult to manufacture due to its complicated shape, but also requires precise operation because a pin must be inserted into the air passage when closed, and when opened, the end of the air passage is exposed to expose foreign matters. There is a risk of inflow, which causes the failure.

Another conventional technique is to block the inlet of the air flow pipe of the cap portion with an elastic spring plate formed in the main body of the cap. In this case, however, the horizontal movement force of the print head carrier which ends the printing operation and returns to the printing apparatus is used. Since the cap means must be moved horizontally to achieve the desired capping operation. Therefore, there is a problem that the volume of the device also increases.

In order to solve this problem, the present invention provides a pressing part on one side of the horizontal reciprocating slide means by a separate driving motor, and by installing an air valve on a part of the guide body to face the pressing part. Regardless, the volume of the device is reduced by allowing the air valve to operate. In addition, the air valve of the present invention is configured so that the end of the air flow path extending from the cap portion is always sealed to prevent foreign matter from entering.

The purpose and effect of the present invention is a cap means and a wiper means for performing only the vertical reciprocating motion, a slider means for inducing a vertical reciprocating motion of the cap means and the wiper means, and a horizontal reciprocating rotational movement so that the slider means A capping device comprising a movement direction switching means for converting to a movement, a power means for imparting a rotational force to the motion direction switching means, and a power transmission means for transmitting power, on one side of a slider plate which is a movable part of the slider means. It is achieved by the formed pressing means and the valve means provided on one side of the guide body which is a fixed portion of the slider means.

Hereinafter, the configuration of the present invention will be described in detail with reference to FIGS. 1 to 3.

Referring first to FIG. 1, reference numeral 11 denotes a cap means for vertically reciprocating to seal the ink jet head. The cap means 11 has a rubber cap 12 that is in close contact with the nozzle portion of the ink jet head, and the rubber cap 12 is coupled to the cap portion in which the air flow passage 15 and the remaining ink flow passage 16 are formed ( 14), the slide vertical rod 18 and the horizontal protrusion rod 19 which is integrally coupled with the cap portion 14 and slides in the guide cylinder 22 and the guide groove 24 to be described later, and the horizontal It is composed of an unillustrated coil spring 20 wound on a slide vertical rod 18 below the protruding rod 19.

Reference numeral 22 is a guide tube for guiding the cap means 11 and the wiper means 21 to the vertical reciprocating movement in a limited position. The guide tube 22 is a cylindrical body with a pupil formed at the center thereof to guide the slide vertical rod 18, and at one side thereof, a guide groove 24 is formed to allow the horizontal protrusion rod 19 to move up and down. have. The guide groove 24 is formed in a direction in which the end portion of the horizontal protrusion rod 19 can contact the guide piece 34 described later.

Reference numeral 31 is a slide means for inducing a vertical reciprocating motion of the cap means 11 and the wiper means 21. The slide means 31 is a guide body provided with a guide plate (38) protruding from the slide plate 32 and the upper surface is formed with a guide piece 32 on the bottom surface and the guide cylinder 22 and the air valve 104 on the side It consists of 36. The slide plate 32 is a rectangular plate body, and a guide piece 34 formed with an inclined portion and a horizontal portion integrally formed on one lower surface thereof. In addition, the guide piece 34 extends rearward to form an extension part 33, and a first connection to the upper surface of which the connecting lever 54 of the movement direction switching means 51 described below is rotatably coupled. The pressing part 102 which presses the protrusion 55 and the air valve 104 is formed.

The rear surface of the slide plate 32, that is, the surface on which the guide piece 34 does not protrude, is slidably in contact with the front surface of the guide body 36, that is, the surface on which the guide tube 22 is not integrally coupled. It is. In addition, the upper surface of the slide plate 32 is slidably in contact with the guide bent portion 38 protruded from a portion of the upper portion of the guide body 36 is bent downward. The lower surface of the guide piece 34 formed under the slide plate 32 is in contact with the upper surface of the horizontal protrusion rod 19 of the cap means 11 and the wiper means 21 described above. Accordingly, the slide plate 32 is slidable between the guide protrusion 38 and the upper surface of the horizontal protrusion rod 19.

Reference numeral 51 is a movement direction switching means for converting the rotational movement into a horizontal reciprocating motion so that the slide plate 32 is a horizontal reciprocating motion. This movement direction switching means 51 is a rotary gear 52 that rotates about the first fixed shaft 53 by the rotational force of the power transmission means 61 described above, and the rotation of the rotary gear 52 It is composed of a connecting lever 54 for converting the movement into a horizontal reciprocating motion and transmitting it to the slider plate 32. One end of the connecting lever 54 is rotatably coupled to the second connecting protrusion 56 protruding from the upper surface of the rotary gear 52 at a predetermined distance from the first fixed shaft 53, and the other end of the guide plate. It is rotatably coupled to the first connecting projection 55 protruding integrally over the upper portion of the extension portion 33 extending rearward (34).

Reference numeral 61 is a power transmission means for transmitting the driving force of the motor 72 to the rotary gear (52). The power transmission means 61 is composed of a power interruption gear body 62 and a first transmission gear 66. The power interruption gear body 62 connects two unit gears 63 and 64 coupled such that the upper gear 67 having a relatively large diameter and the lower gear 68 having a smaller diameter form the same shaft hole. It is a gear assembly connected with 65). Both ends of the connecting rod 65 are vertically formed with elastic pins 69 inserted into the shaft holes of the unit gears 63 and 64 to rotatably couple the unit gears 63 and 64. The elastic pin 69 is installed apart from the distance that the gears of the two upper gears can be engaged with each other.

On the other hand, the power transmission gear 66 is integrally coupled so that the upper gear of relatively small diameter and the lower gear of relatively large diameter form the same shaft hole. The upper gear is engaged with the rotary gear 52 and the lower gear is Meshes with the lower gear of the power interrupting gear body 62.

Referring to the power control gear body 62 in more detail, the power transmission gear body 62 transmits power from the sun gear 64 and the sun gear 64 which receive power from the power means 71 described above. It is composed of a planetary gear 63 that moves along with its transmission. That is, the sun gear 64 is fixed by the second fixed shaft 73 to perform only the rotational movement, while the planetary gear 63 is not fixed to the fixed shaft, so that the rotational movement and the revolution movement at the same time. On the other hand, the planetary gear 63 is to rotate around the sun gear 64 in accordance with the rotation direction of the sun gear 64, the first transmission for transmitting power to the movement direction switching means 51 on the orbit Since the second transmission gear 82 for transmitting power to the gear 66 and the pumping means 81 is installed, it engages with the first transmission gear 66 or the second transmission gear in accordance with the rotation direction of the ocean gear 64. To (82).

The second transmission gear 82 is integrally coupled to form a shaft hole of the upper gear with a relatively large diameter and the lower gear with a relatively small diameter, and is rotatably fixed by the third fixed shaft 77. have. This transmission gear 82 transmits power to the pump means 81 for pumping the residual ink. The pump means 81 comprises a pump gear 84 that receives power from the lower gear of the second transmission gear 82, three cylindrical rotary rollers 87 located on the bottom of the pump gear 84 and And three fourth fixed shafts 85 integrally formed on the bottom surface of the pump gear 84 so as to rotatably fix the cylindrical rotary roller 87, and formed near the orbit of the rotary roller 87. Compartment 91 is made. Therefore, the rotating roller 87 rotates about the fifth fixed shaft 88 and rotates about the fourth fixed shaft 85 while drawing a certain circle according to the rotation of the pump gear 84. .

Reference numeral 71 denotes a power means. The power means 71 is composed of a motor 72 for generating power and a third transmission gear 74 for transmitting power. The third transmission gear 74 meshes with the sun gear 64 of the power control gear body 62.

Referring to FIG. 2, reference numeral 101 denotes an air valve means. The air valve means 101 is composed of an air valve 104 and a pressing part 102. The air valve 104 is a box-shaped tetrahedron, and a circular through hole 106 is formed at one side thereof, and an opposite side thereof is a fully open side, and a snap fit 107 is formed at the other two sides, that is, the upper and lower sides thereof. It consists of a valve cover 108 and a rubber valve 110 which is installed in the valve cover 108 and horizontally movable to a certain degree.

The rubber valve 110 is a cylindrical guide rod 111 is inserted into the through hole 106 and slides, and extends from the outer circumferential surface of one end of the guide rod 111 to form a conical shape and elastic having a predetermined elasticity It is integrally coupled to the cylinder 112 and the other end of the elastic cylinder 112, the outer circumferential surface is formed almost the same shape as the open surface of the valve cover 108 and a circular valve hole 114 in the center of the Air valve plate 116.

The air valve 104 is a recess 119 of the air valve support wall 118 protruding in the vicinity of the guide body 36 in which the guide cylinder 22 in which the slide vertical rod 19 is guided by the cap means 11 is formed. It is supported by coupling the snap fit 107).

On the other hand, the air valve support wall 118 is formed with an air hole 117 facing the valve hole 114 of the rubber valve 110, the outside of the air distribution pipe 119 to the air valve support wall ( 118) It is formed integrally.

The pressing part 102 is vertically projected along both sides of the extension part 33 from which the guide piece 34 of the slide plate 32 extends, and a circular hole 128 is formed in the same line on each side thereof. It consists of a wall 126 and a push pin 122 that fits and slides into the hole 128 of the support wall 126.

The push pin 122 is a cylindrical push rod 130 for pressing the slide rod 111 of the air valve 104, and the coil spring wound on the push rod 130 to impart a restoring force to the push pin 122 124 and the stopper 134 for restricting the pressing rod 130 from being separated.

Hereinafter, the effects of the present invention will be described with reference to a representative embodiment.

When a print signal is applied according to a built-in program, a print head carrier equipped with an ink cartridge prints a predetermined figure or character on the recording paper while horizontally reciprocating the printing section along the guide shaft. When the print end signal is applied, the print head carrier which is performing the print job is moved out of the print section and enters the print standby section. The printing apparatus means a section other than a section in which the print head carrier performs a printing operation while horizontally reciprocating.

In this printing state, when the printhead carrier enters the printing stand, the printhead capping device is activated. That is, when the print head carrier enters the printing stand, the dedicated motor 72 is driven in a specific direction, and the power transmission gear 61 transmits the rotational force of the motor 72 to the rotary gear 52 to rotate it. The connecting lever 54 coupled to the rotary gear 52 switches the movement direction of the slide plate 32 to the horizontal reciprocating motion, and the slide plate 32 guides the cap means 11 to the vertical reciprocating motion. At the same time, the pressing portion 102 of the air valve means 102 is reciprocated horizontally.

Hereinafter, the first horizontal portion 41, the third horizontal portion 45 and the second horizontal portion 43 and the first inclined portion 42 and the second inclined portion at the position where the guide piece 34 is high. Taking the case with (44) as an example, the operation of the air valve of the present invention will be described in more detail as follows.

4a to 4c, first, as shown in FIG. 4a, when one end of the connecting lever 54 is in the b position by the rotation of the rotary gear 52, the slide plate 32 is the guide body Side by side with (36). When the slide plate 32 is placed in the same position as the guide body 36 as described above, both the horizontal protrusion rod 19 of the cap means 11 and the horizontal protrusion rod 19 of the wiper means 21 are guide pieces 34. Contact with the second horizontal portion 43). Since the second horizontal portion is at a lower position than the inclined portion or another horizontal portion, the horizontal protrusion rod 19 is placed at a lower position. Thus, the cap means 11 and the wiper means 21 are separated from the print head of the ink jet printer. At this time, the coil spring 20 is compressed by the horizontal protrusion rod 19 in a low position has a strong restoring force. The state in which the cap means 11 and the wiper means 21 are separated from the print head as described above is when the print head carrier is performing a print job in the print section. In this step, since the pressing portion 102 is separated from the air valve 104, the air valve is not operated.

In this state, when the rotary gear 52 is further rotated so that one end of the connecting lever 54 is in the a position, as shown in FIG. 4B, the slide plate 32 is moved inward of the guide body 36. Then, the horizontal protrusion rod 19 of the wiper means 21 rises along the second inclined portion 44 of the guide piece 34 to reach the third horizontal portion 45. Since the third horizontal portion 45 is located at a position higher than the second horizontal portion 43, the horizontal protrusion rod 19 suppressed by the second horizontal portion 43 rises due to the elasticity of the coil spring 20. Done. Therefore, the wiper means 21 is raised to a height capable of wiping the surface of the print head. In this manner, when the wiper means 21 is raised, the remaining ink and impurities adhering to the nozzle face of the print head are wiped off as the print head carrier enters the printing apparatus. Also in this case, since the pressing part 102 is separated from the air valve 104, the air valve does not operate.

Subsequently, when the rotary gear 52 is rotated so that one end of the connecting lever 54 is in the position c, the slide plate 32 is horizontally moved to protrude outwardly in front of the guide body 36, and the second horizontal portion The horizontal protrusion rod 19 of the cap means 11 suppressed by 43 rises along the first inclined surface 42. As a result, when the horizontal protrusion rod 19 reaches the first horizontal surface, the rubber cap 12 of the cap means 11 is in close contact with the print head which is already located on the cap means 11 to cap the nozzle portion.

As such, when the slide plate 32 is horizontally moved out of the guide body 36 so that the rubber cap 12 caps the print head, that is, when one end of the connecting lever 54 is positioned at c, the slide The pressing portion 102 integrally coupled with the plate 32 is also horizontally moved forward with the slide plate 32 and as shown in FIG. 4C, the pressing rod 130 protruding from the tip of the pressing portion 102. ) Presses the rear end of the guide rod 111 of the rubber valve (110).

When the rubber valve 110 is pressed by the pressing unit 102 as described above, the rubber valve 110 itself moves forward, so that the air valve plate 116 of the rubber valve 110 moves to the air valve support wall 118. Close to) And if the pressure continues to be further, the elastic cylinder 112 formed in the middle portion of the rubber valve 110 is crushed more closely. As a result, the rubber valve 110 completely seals the air hole 117 that is established in the air valve support wall 118, and has a restoring force directed to the rear thereof.

As the air hole 117 is closed as described above, the air flow path formed of the air flow pipe 119 and the air flow port 15 is blocked, so that the inside of the rubber cap 12 is completely sealed. In this capping state, the inside of the rubber cap 12 is completely isolated from the atmosphere, and thus maintains proper moisture at all times, so that the nozzle face of the print head is not hardened. This capping state is maintained until the next print job is started.

Meanwhile, in this capping state, a pumping operation for removing residual ink accumulated in the cap part 14 may be performed. In order to perform the pumping operation, first, the motor 72 must be rotated in a direction opposite to the driving direction of the cap means 11 so that the planetary gear 63 and the third transmission gear 82 of the power control gear 62 are engaged. . Then, the third transmission gear 82 is engaged with the pump gear 84 to transmit the rotational force. When the pump gear 84 is rotated, the three cylindrical rotary rollers 87 located at the bottom of the pump gear 84 rotate in a constant circle about the fifth fixed shaft 88 and at the same time the fourth fixed shaft 85 Will rotate around. Therefore, the rubber plate 92 sandwiched between the cylindrical rotating roller 87 and the partition 91 is periodically pressed by the rotating roller 87 to form a vacuum in the rubber tube 92. This vacuum pressure causes the inside of the cap 14 to be in a vacuum state, so that the remaining ink is sucked out and discharged.

After the pumping operation is completed and the capping state is maintained for a certain period of time, when the printing signal is applied again, the motor 72 is rotated forward to form the planetary gear 63 of the power control gear 62 and the first transmission gear. The slide plate 32 is moved to the center portion of the guide body 36 by being engaged with the 66 and continuing driving of the motor 72. Then, as shown in Figure 4b, the rubber cap 12 is separated from the print head by the horizontal protrusion rod 19 of the cap means 11 is lowered along the first inclined pipe.

However, when a pumping operation for sucking residual ink in the capping state is performed, a strong vacuum is formed in the rubber cap 12, so that the rubber cap 12 may not fall off from the print head during capping release. Therefore, in order to separate the rubber cap 12 smoothly, the air flow passage 15 should be opened to blow air or flow air into the cap 14 immediately before or at the same time as the rubber cap 12 is separated.

The air valve means 101 of the present invention is operated while the rubber cap 12 is separated from the print head. That is, when the slide plate 32 begins to move to the center portion of the guide body 36 by the rotation of the rotary gingham 52, the pressing portion 102 integrally coupled to the slide plate 32 is also rearward at the same time. Begin to retreat. Accordingly, the push pin 122 pressurizing the guide rod 111 of the rubber valve 110 is also retracted to lose its pressing force.

When the push pin 122 is retracted as described above, the rubber valve 110 is retracted backward by the elasticity of the elastic cylinder 112 of the rubber valve 110. As a result, a gap is formed between the air valve tube 116 and the air valve support wall 118 at the tip of the rubber valve 110. Therefore, the air hole 117 and the air flow pipe 119 leading to the air flow path 15 of the cap portion 14 are opened and the vacuum in the rubber cap 12 is released.

Summarizing the operation of the air valve means 101 of the present invention, the air valve means 101 for the capping device of the present invention is the air valve pressing portion 102 installed on one side of the extension portion 33 of the guide piece 34 And an air valve 104 installed on the guide body 36 to oppose the pressing part 102, and when the connecting lever 54 is in the position of c, the pressing pin 122 of the pressing part 102 is formed. Presses the rubber valve 110 of the air valve 104, the air valve plate 116 and the air valve support wall 118 is in close contact with the air hole 117 and the air distribution pipe 119 that is distributed into the rubber cap 12 ) Is sealed. On the contrary, when the connecting lever 54 is moved to the position of a or b, the push pin 122 and the rubber valve 110 retreat at the same time as the slide plate 32 moves and the air hole 117 and the air flow pipe 119 move. ) Is opened to facilitate the separation of the rubber cap (14).

On the other hand, the air valve means 101 of the present invention can also perform the role of the air pump by appropriately changing the shape of the guide plate 34. That is, the pressurized pin 122 presses the guide rod 111 of the rubber valve 110 just before the rubber cap 12 is separated from the print head, so that the compressed air is provided with the air hole 117 and the air flow path 15. Into the inside of the rubber cap (12). Then, the same effect as the above-described effect of opening the air passage 15 can be obtained.

As described above, the air valve structure of the print head capping device of the ink jet printer according to the present invention is provided with a pressing part on a slide plate horizontally reciprocating by a separate driving motor, and a guide body to face the pressing part. By installing the air valve, the air flow path is opened and closed without the horizontal movement of the cap means, thereby reducing the volume of the device.

In addition, the air valve structure of the print head capping device of the ink jet printer according to the present invention, since the air hole is double sealed by the elastic cylinder of the valve cover and the rubber valve, foreign substances cannot enter from the outside.

In addition, the air valve structure of the print head capping device of the ink jet printer according to the present invention has an effect that the diameter of the elastic cylinder sealing the air hole is relatively much larger than that of the air hole, so that the operation can be surely performed even if the valve operation is not precise. There is.

Since the present invention described above has been described for exemplary embodiments only for illustrative purposes, those skilled in the art may implement a variety of modifications and applications based on the present invention, it is the inventor Is intended to be included in the true spirit and spirit of the appended claims.

Claims (3)

Cap means and wiper means for vertical reciprocating motion, slider means for inducing vertical reciprocation motion of the cap means and wiper means, and motion reverberation switching means for converting rotational motion into horizontal reciprocation motion so that the slider plate of the slider means moves horizontally. And a capping device including a power means and a power transmission means for imparting rotational force to the movement direction switching means, the air valve 104 provided on one side of the guide body 36 which is a fixed portion of the slider means 31; And a pressing part 102 formed on one side of the slider plate 32 which is a movable part of the slider means 31 so as to correspond to the air valve 104. Air valve structure for the capping device of the ink jet printer, characterized in that the opening and closing. According to claim 1, wherein the pressing means 102 is projected vertically along both sides of the extension portion 33, the guide piece 34 of the slide plate 32 is extended and a circular hole 128 on one side thereof The support wall 126 formed in the same line, respectively, the cylindrical pressing rod 130 for pressing the air valve 104 and the coil spring 124 and the pressing rod wound around the pressing rod 130 to give a restoring force Air valve structure for the capping device of the ink jet printer, characterized in that it comprises a push pin (122) consisting of a stopper (134) for limiting the 130 is not separated. According to claim 1, wherein the air valve 104 means is a box-shaped tetrahedron is formed with a circular through hole 106 on one side and the opposite side is open safely, the other two sides of the air valve support wall 118 A valve cover 108 having a snap fit 107 coupled to the groove 119, a cylindrical guide rod 111 inserted into the through hole 106 of the valve cover 108, and a slide; An elastic cylinder 112 extending from an outer circumferential surface of one end of the end portion 111 and having a conical shape and having a predetermined elasticity is integrally coupled to the other end of the elastic cylinder 112, and an outer circumferential surface of the valve cover 108 is formed. A rubber valve 110 composed of an air valve plate 116 of a rectangular plate body having a circular valve hole 114 formed in a shape substantially the same as an open surface, and a slide of the cap means 11. Near the guide body 36 in which the guide cylinder 22 through which the vertical rods 19 are formed is formed. An air hole 117 formed in the air valve support wall 118 formed to face the valve hole 114 of the air valve 104 and an outer side of the air valve support wall 118 so as to face the air hole 117. An air valve structure for a capping device of an ink jet printer, comprising an air distribution pipe (119) connected to a rubber tube communicating with an inside of the rubber cap (12) formed thereon.