JP6346779B2 - ink cartridge - Google Patents

Description

  The present invention relates to an ink cartridge that can prevent ink from dripping from an ink supply port of an ink cartridge when the ink cartridge is removed from a printing apparatus.

  In general, an ink jet printing apparatus to which an ink jet method is applied includes, for example, a plurality of ink cartridges that store ink such as yellow (Y), magenta (M), cyan (C), and black (K) for each ink color. Used.

  Then, by supplying ink from each color ink cartridge to an ink jet head provided for each ink color, and discharging each color ink from the ink jet head of each color toward the paper, images and characters can be printed on the paper in color. The printer is widely used as a printing device for home use or business use, and is configured to be capable of monochrome printing with only one color of black (K) ink.

  At this time, a plurality of ink cartridges containing ink for each ink color are detachably attached to the ink jet printing apparatus. When the ink cartridge is removed from the ink jet printing apparatus, the ink supply port of the ink cartridge is used. Since ink has accumulated, ink dripping may occur from the ink supply port.

  Therefore, there is an ink cartridge that can prevent ink from dripping from the ink supply port of the ink cartridge when the ink cartridge is removed from the ink jet printing apparatus (see, for example, Patent Document 1).

  On the other hand, the present applicant has proposed an ink cartridge in which an ink supply port is formed that can increase the amount of ink supplied from the ink cartridge to the printer side in accordance with high-speed printing on paper (for example, Patent Document 2). reference).

  First, in the ink cartridge disclosed in Patent Document 1 described above, although not shown here, the ink cartridge has an ink supply port formed in the cartridge body. In addition, an absorber that absorbs and holds ink leaking from the ink supply port is mounted in a recess formed around the outside of the ink supply port of the cartridge body using urethane foam or the like.

  On the other hand, an ink introduction member through which an ink supply port of an ink cartridge is inserted and removed is projected from a head holder in an ink jet recording apparatus (ink jet printing apparatus).

  Therefore, after the ink cartridge is installed in the ink jet recording apparatus, when the ink supply port formed in the cartridge body is removed from the ink introduction member protruding from the head holder, the ink leaked from the ink supply port is held by the absorber. Therefore, it is possible to prevent the ink from dripping when the ink cartridge is replaced, or the ink from adhering to the surface other than the portion where the head holder and the absorber of the cartridge body are mounted.

  Next, in the ink cartridge disclosed in Patent Document 2 described above, although not shown here, the ink supply port that engages with the joint portion of the holder portion of the printer is opened, and the ink supply port An inner plug is provided to be movable in the front-rear direction, and an O-ring is fitted into the inner plug and the inner plug is moved in front of the ink supply port to seal the ink path to the ink supply port. ing.

  On the other hand, an insertion shaft protrudes from the joint portion of the printer holder so as to face the ink supply port of the ink cartridge, and an ink inflow path through which ink from the ink cartridge passes is formed around the insertion shaft. ing.

  When the ink cartridge is connected to the joint portion of the printer holder portion, the insertion shaft provided in the joint portion is pushed into the ink supply port of the ink cartridge, and the inner plug is opposite to the ink supply port side with this insertion shaft. As a result, an ink outflow path for passing ink toward the ink supply port side is formed, so that a large amount of ink can be supplied from the ink supply port to the printer side.

Japanese Patent Laid-Open No. 9-20015 JP 2010-82999 A

  Incidentally, in the ink cartridge described in Patent Document 1, as described above, an absorber that absorbs and holds ink leaked from the ink supply port of the cartridge body is mounted in the vicinity of the ink supply port. Since the body uses urethane foam or the like, it swells and deteriorates due to oil-based ink, and the ink cannot be absorbed due to deterioration of the absorber.

  Further, when the attachment and detachment is repeated between the ink jet recording apparatus and the ink cartridge, the ink may not be absorbed beyond the amount that the absorber can absorb the ink, and the ink may drip from the ink supply port.

  Therefore, in developing an ink cartridge that can prevent the ink from dripping from the ink supply port of the ink cartridge when the ink cartridge is removed from the ink jet printing apparatus by applying the technical idea disclosed in Patent Document 2. The present inventors have provided an ink holding portion on the front end side of the inner plug installed opposite to the ink supply port, and the ink dripping by holding the ink existing in the vicinity of the ink supply port in the ink holding portion. It was found that can be prevented.

  At this time, when the insertion shaft provided in the joint portion of the holder portion is inserted into the ink holding portion provided on the distal end side of the inner plug, the ink accumulated in the ink holding portion is removed from the opening portion of the ink holding portion by the insertion shaft. To provide an ink cartridge that can prevent extrusion, and can hold a sufficient amount of ink in the ink holding portion even when the depth of the ink holding portion is deep when the insertion shaft is pulled out from the ink holding portion. With the goal.

The present invention has been made in view of the above problems, and the first invention includes an ink storage container for storing ink,
A socket part provided at one end of the ink storage container, for detaching from the joint part of the printing apparatus;
An ink supply port provided in the socket portion;
An inner plug that is installed opposite to the ink supply port and seals the ink path to the ink supply port by being moved toward the ink supply port by a biasing force from the ink storage container side;
A seal member that seals the ink on the ink storage container side when the inner plug moves to the ink supply port side; and
In mounting the socket portion on the joint portion, in the ink cartridge communicating the ink path by pressing the inner plug against the biasing force by an insertion shaft provided in the joint portion,
The insertion shaft is provided in a shape extending in the axial direction,
The inner plug includes an ink holding portion having an opening,
The ink holding part is
A first opening on the side where the insertion shaft is inserted;
A second opening that is between the position of the first opening in the axial direction and the sealing position by the seal member and penetrates from the inside of the ink holding portion to the surface of the inner plug;
An ink cartridge comprising:

The second invention is the ink cartridge of the first invention described above,
The ink cartridge is characterized in that the second opening is provided on a surface different from a surface on which the first opening of the ink holding portion is located in the axial direction.

  According to the ink cartridge of the first invention, the inner plug that is pressed in the socket body of the socket portion by the insertion shaft provided in the joint portion includes the ink holding portion having an opening, and the ink holding portion is inserted Since the first opening on the side where the shaft is inserted and the second opening penetrating from the inside of the ink holding portion to the surface of the inner plug are provided, the ink is removed when the insertion shaft is pulled out from the inside of the ink holding portion. The ink existing in the vicinity of the supply port can be held by the ink holding unit, and even if the attachment and detachment is repeated between the joint unit and the socket unit, the ink can be prevented from dripping from the ink supply port of the socket body.

  At this time, when the insertion shaft of the joint portion is inserted into the ink holding portion provided in the inner plug, the outer periphery of the inner plug is passed through the second opening provided in the inner plug while pushing the ink accumulated in the ink holding portion with the insertion shaft. Since the ink can be pushed out of the surface, the ink can be prevented from flowing out from the first opening of the ink holding portion.

  On the other hand, when the insertion shaft is pulled out from the ink holding portion, the ink near the outer peripheral surface of the inner plug can be drawn into the ink holding portion through the second opening. A sufficient amount of ink can be maintained.

  Further, even if the ink cartridge is removed from the printing apparatus, the ink held in the ink holding portion of the inner plug can be prevented from dripping from the ink holding portion due to surface tension, so that the ink cartridge can be carried safely.

  According to the ink cartridge of the second invention, the second opening is provided on a surface different from the surface on which the first opening of the ink holding portion is located in the axial direction of the insertion shaft. The ink can be taken in and out between the ink holding portion and the outer peripheral surface of the inner plug without affecting the first opening of the ink holding portion when the ink is inserted into and removed from the ink holding portion.

1 is a configuration diagram showing a schematic configuration of an ink jet printing apparatus to which an ink cartridge according to the present invention is applied. FIG. 3 is a perspective view showing an external shape of an ink cartridge according to the present invention. (A), (b) is the perspective view and longitudinal cross-sectional view which showed the state which connects the ink cartridge which concerns on this invention to the cartridge attachment mechanism part in a printer. (A)-(d) is the figure which expanded and showed the joint part in a printing apparatus, and the socket part in the ink cartridge fitted by this joint part. (A)-(c) is the operation | movement figure which showed the operation | movement which fits the socket part of an ink cartridge in the joint part in a printing apparatus in order. (A)-(d) is the operation | movement figure which showed the operation | movement which pulls out the joint part in a printing apparatus from the socket part of an ink cartridge in order. (A)-(f) is the ink cartridge which concerns on this invention, The ink holding part which has the 1st opening formed in the front end side cylindrical part of the inside plug in a socket main body, The ink holding part, and the front end side of an inside plug It is the figure which showed each shape of one or more 2nd opening (through-hole) which connects the outer peripheral surface of a cylindrical part, respectively.

  Hereinafter, embodiments of an ink cartridge according to the present invention will be described in detail with reference to FIGS.

  Before describing the ink cartridge according to the present invention, an ink jet printing apparatus to which the ink cartridge according to the present invention is applied will be briefly described with reference to FIG.

  FIG. 1 shows a schematic configuration of an ink jet printing apparatus to which an ink cartridge according to the present invention is applied.

  As shown in FIG. 1, in an inkjet printing apparatus (hereinafter simply referred to as a printing apparatus) 10, a joint portion 30 supported by a holder 21 of a cartridge mounting mechanism section 20 provided in the printing apparatus 10 is related to the present invention. A socket portion 50 provided in the ink cartridge 40 is detachably connected.

  At this time, the holder 21 of the cartridge mounting mechanism portion 20 is connected to the lower side of the front plate 21a, and the cartridge mounting table 21b is integrally formed. The ink cartridge 40 is attached to the printing apparatus 10 on the cartridge mounting table 21b. It is mounted with an inclination of about 2 ° so that the ink IK flows toward it.

  As will be described later, after the ink cartridge 40 is connected to the cartridge mounting mechanism portion 20, the joint portion 30 supported by the front plate 21 a of the holder 21 is moved by the cam drive mechanism portion 11 provided in the printing apparatus 10. The socket 50 in the cartridge 40 is driven in the front-rear direction.

  On the other hand, in the ink cartridge 40 according to the present invention, the socket part 50 is disposed in the rectangular outer box 41 toward the front surface 41a side of the outer box 41, and the rear end of the socket part 50 is made oily. An ink storage container 60 that stores the ink IK is attached.

  An IC tag 42 is attached to the outer box 41, and the IC tag receiver 12 is installed in the printing apparatus 10 so as to face the IC tag 42, and the IC tag receiver 12 places the inside of the IC tag 42. The color information of the ink IK stored in can be received wirelessly.

  In the printing apparatus 10, for example, a plurality of ink cartridges 40 that store multicolor inks IK such as yellow (Y), magenta (M), cyan (C), and black (K) are mounted for each color. Here, one ink cartridge 40 is illustrated and described below.

  The ink IK from the ink cartridge 40 described above is filled in the ink tank 15 by opening / closing the electromagnetic opening / closing valve 14 through the ink supply path 13 from the socket portion 50 through the joint portion 30 of the printing apparatus 10.

  Further, the ink tank 15 is provided with a liquid level sensor S for measuring the amount of the filled ink IK, and the opening / closing of the electromagnetic on-off valve 14 is controlled (not shown) according to the detection result of the liquid level sensor S. It is controlled through the unit.

  The ink IK is supplied from the ink cartridge 40 to the ink tank 15 by a pressure difference between the ink cartridge 40 disposed at a high place and the ink tank 15 disposed at the low place.

  Thereafter, the ink IK filled in the ink tank 15 is sent to the ink distributor 17 through the ink supply path 16, and is distributed to the plurality of inkjet heads 18 by the ink distributor 17. The ink IK is ejected from the plurality of inkjet heads 18 toward the paper P so that images and characters can be printed on the paper P.

  Here, the configuration of the ink cartridge 40 according to the present invention will be described with reference to FIGS.

  FIG. 2 is a perspective view of the appearance of the ink cartridge according to the present invention. FIGS. 3A and 3B show a state where the ink cartridge according to the present invention is connected to the cartridge mounting mechanism in the printing apparatus.

  First, as shown in FIG. 2, in the ink cartridge 40 according to the present invention, the outer box 41 uses a paper material or the like to set the ratio of the vertical dimension in the vertical direction to the horizontal dimension in the horizontal direction to about 1: 2. It is formed in a box shape.

  Further, on the front surface 41a side of the outer box 41, the connecting member 43 is integrally attached to the outer box 41 using a plate material having rigidity such as a resin material or a metal material.

  The connecting member 43 described above has a function of connecting the ink cartridge 40 to the printing apparatus 10 (FIG. 1) and a function of connecting the socket unit 50 in the ink cartridge 40.

  Then, locking concave portions 43 a and 43 b that are connected to the cartridge mounting mechanism portion 20 of the printing apparatus 10 (FIG. 1) are formed in the outer central upper and lower portions of the connecting member 43.

  Further, a pair of convex portions 43 c and 43 c are formed on both sides of the locking concave portion 43 a on the outer upper portion of the connecting member 43, and the pair of convex portions 43 c and 43 c are located above the front plate 21 a of the holder 21. Is detected by the cartridge mounting sensor 24 {FIG.

  Further, the connecting member 43 is formed with a circular hole 43d penetrating through the central portion of the front surface 41a, and the socket portion 50 faces the circular hole 43d. The formed ink supply port 51e is exposed toward the printing apparatus 10 (FIG. 1).

  The ink supply port 51e has a large diameter, for example, about φ2.5 mm, and a large amount of ink IK is transferred from the ink supply port 51e formed to a large diameter to the printing apparatus 10 (FIG. 1) side. It is configured so that it can be supplied.

  In the ink cartridge 40 according to the present invention, the socket portion 50 is disposed to face the joint portion 30 (FIG. 1) in the printing apparatus 10 (FIG. 1), and the socket body 51 of the socket portion 50 is arranged. An ink storage container 60 {FIG. 3B} formed in a bag shape using a film material is attached to the rear portion by heat welding. Therefore, the socket part 50 is provided at the front end which is one end of the ink container 60.

  Next, as shown in FIGS. 3A and 3B, when the ink cartridge 40 according to the present invention is connected to the cartridge mounting mechanism 20 in the printing apparatus 10 (FIG. 1), the cartridge mounting mechanism 20 is The holder 21 serving as a base using a resin material is connected to the substantially vertical front plate 21a, the cartridge mounting table 21b horizontally provided below the front plate 21a, and the left and right sides of the front plate 21a. A pair of left and right side plates (21c... Not shown) and 21d are integrally formed on a rigid frame.

  At the center portion of the front plate 21a of the holder 21 described above, an annular portion 21e having a through hole 21e1 with a guide groove is formed protruding toward the rear side opposite to the ink cartridge 40 side.

  And the 1st, 2nd outer peripheral side cylindrical part 31a, 31b formed in the joint main body 31 of the joint part 30 fits in the through-hole 21e1 with the guide groove of the annular part 21e of the holder 21 so that sliding is possible in the front-back direction. It is supported together.

  At this time, a stopper 21f is integrally provided at the rear end of the annular portion 21e of the holder 21 to restrict the joint portion 30 from coming out of the through hole 21e1 with the guide groove of the annular portion 21e. An outer peripheral convex portion 31c formed on the joint body 31 to be described later contacts and separates from the stopper 21f.

  Further, the cartridge mounting table 21b of the holder 21 has a bottom surface 21b1 formed horizontally, and the inclined surface 21b2 is inclined above the bottom surface 21b1 by about 2 ° so that the height decreases toward the front plate 21a. Is formed.

  When the ink cartridge 40 is mounted on the inclined surface 21b2 of the cartridge mounting base 21b, the ink IK in the ink cartridge 40 flows toward the joint portion 30 side.

  Further, lock members 22 and 23 are provided above and below the holder 21 and elastically displaced by attaching rollers 22a and 23a to one end of the leaf spring material, respectively. The locking recesses 43a and 43b are formed above and below the connecting member 43 provided on the front surface 41a side of the outer box 41 of the ink cartridge 40 so as to face the lock members 22 and 23.

  The ink cartridge 40 is manually pushed into the holder 21 side of the cartridge mounting mechanism 20 to be connected. At this time, the rollers 22a and 23a of the locking members 22 and 23 provided on the upper and lower sides of the holder 21 are fitted into the locking recesses 43a and 43b of the connecting member 43 provided on the ink cartridge 40. The connection state of the ink cartridge 40 is detected by the cartridge attachment sensor 24 attached to the upper portion of the holder 21 and the convex portion 43c (FIG. 2) of the connection member 43.

  On the other hand, when the ink cartridge 40 is manually pulled out from the holder 21 side, the connection to the holder 21 side is released.

  Further, as will be described later in the operation, when the ink cartridge 40 is pushed into the holder 21 side of the cartridge mounting mechanism 20 and the ink cartridge 40 is connected to the holder 21 side, the joint portion 30 and the socket portion 50 are slightly They are facing each other with a certain distance. After the connection, the joint portion 30 is movable in the front-rear direction with respect to the socket portion 50 in the ink cartridge 40 by the cam drive mechanism portion 11 provided in the printing apparatus 10 (FIG. 1).

  Thus, the joint portion 30 and the socket portion 50 are fitted only when the ink cartridge 40 is connected to the holder 21 first.

  The reason for this is that, as described above with reference to FIG. 1, the color information of the ink IK output from the IC tag 42 attached to the outer box 41 of the ink cartridge 40 is received by the IC tag receiver 12 to receive the ink cartridge. This is because it is necessary to fit the joint portion 30 to the socket portion 50 after confirming that the color of the 40 ink IK is correct.

  At this time, when the plug-shaped joint portion 30 is referred to as a male plug portion, while the socket-shaped socket portion 50 is referred to as a female socket portion, the male plug portion (30) and the female plug portion (30) The mold socket part (50) is fitted into the male and female.

  Here, the joint part 30 in the printing apparatus 10 and the socket part 50 in the ink cartridge 40 constituting the main part of the embodiment will be described with reference to FIGS.

  4A to 4D show an enlarged view of the joint portion in the printing apparatus and the socket portion in the ink cartridge according to the present invention fitted to the joint portion.

(Joint part 30)
As shown in FIGS. 4A and 4B, the joint portion 30 provided in the printing apparatus 10 is connected to the socket portion 50 provided in the ink cartridge 40 described later on the side of the cap 36 attached to the outer periphery of the joint body 31. It is comprised as the fitting side.

  And the joint main body 31 used as the base | substrate of the joint part 30 is integrally formed using the resin material.

  The joint body 31 is formed with a diameter and a length that allow the first outer cylindrical portion 31a to attach the cap 36 to the tip portion facing the socket portion 50 in the ink cartridge 40. In addition, the second outer peripheral cylindrical portion 31b is connected to the rear of the first outer peripheral cylindrical portion 31a and has a longer diameter than the first outer peripheral cylindrical portion 31a and is substantially the same as the outer diameter of the cap 36. Has been.

  Further, the joint body 31 has an outer peripheral convex portion 31c projecting shortly from an intermediate portion of the long second outer peripheral cylindrical portion 31b, and a flange portion 31d at the rear end of the second outer peripheral cylindrical portion 31b. Is formed in a rectangular shape with respect to the top, bottom, left and right as shown in FIG.

  At this time, the first and second outer cylindrical portions 31a and 31b of the joint body 31 are connected to the annular portion 21e of the holder 21 by the driving force of the cam driving mechanism portion 11 as shown in FIG. When the guide grooved through-hole 21e1 is moved in the front-rear direction, the outer peripheral side convex portion 31c formed at the intermediate portion of the second outer peripheral side cylindrical portion 31b serves as a detent and a stopper.

  4 (a) and 4 (b), a distal-end-side circular recess 31e is formed in the inner peripheral portion on the distal-end side of the joint body 31 so as to be recessed into a circular recess, and this distal-end-side circular recess 31e. A long insertion shaft 31f extends in the axial direction at the center portion of the inside and protrudes forward from the cap 36.

  The long insertion shaft 31f formed to project from the distal end side of the joint body 31 is opposed to an ink supply port 51e of the socket body 51, which will be described later, and is formed with a diameter smaller than the hole diameter of the ink supply port 51e. Therefore, the ink IK is supplied into the joint main body 31 from the ink supply port 51 e of the socket main body 51.

  Further, a tip sharp portion 31f1 is formed in a conical shape at the tip of the insertion shaft 31f of the joint body 31, and the tip sharp portion 31f1 enters the ink supply port 51e of the socket body 51 and then a socket body 51 which will be described later. The shape is such that the ink holding portion 53a1 formed on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53 accommodated therein is easily moved forward and backward.

  In addition, an ink inflow path 31g through which the ink IK supplied from the socket body 51 flows is formed to communicate with the flange portion 31d below the insertion shaft 31f of the joint body 31.

  From the above, an annular (ring-shaped) space is formed between the inner peripheral surface of the tip side circular recess 31e of the joint body 31 and the outer peripheral surface of the small-diameter insertion shaft 31f.

  Further, in the annular (ring-shaped) space within the circular recess 31e on the distal end side of the joint body 31, a reciprocating movement is provided along the compression spring 32 and the insertion shaft 31f from the rear side toward the distal end side. The ink outflow prevention member 33, the O-ring pressing member 34, and the O-ring 35 are accommodated through the insertion shaft 31f.

  Each of these members 32 to 35 is formed so that the ink IK supplied from the ink cartridge 40 can flow into the ink inflow path 31 g of the joint body 31.

  Specifically, the ink outflow prevention member 33 that can move along the insertion shaft 31f has a disk portion 33a that is substantially the same diameter as the inner diameter of the front-end-side circular recess 31e of the joint body 31, and this disk. A plurality of ink inflow holes 33b are formed through the outer peripheral portion of the portion 33a, and three protrusions 33c are formed on the front side of the disc portion 33a at intervals of 120 ° in the circumferential direction. It protrudes toward the 51e side.

  Further, when the joint portion 30 and the socket portion 50 are fitted, the ink outflow prevention member 33 described above is opposed to the outer surface forming the ink supply port 51e of the socket body 51, and has three protrusions. While 33c is in contact with the outer surface forming the ink supply port 51e, portions other than the three protrusions 33c are not in contact.

  Then, when the joint portion 30 and the socket portion 50 are fitted, the ink IK from the ink supply port 51e is placed in a gap formed between a portion other than the three protrusions 33c and the outer surface forming the ink supply port 51e. The ink IK flows through the plurality of ink inflow holes 33b formed in the disk portion 33a of the ink outflow prevention member 33, and finally flows into the ink inflow path 31g.

  Therefore, the ink outflow prevention member 33 has a function of preventing the ink IK that has entered the rear side of the ink outflow prevention member 33 from flowing out to the socket body 51 side through the plurality of ink inflow holes 33b. become.

  Further, by attaching a cap 36 having a large-diameter round hole 36a at the center to the first outer peripheral side cylindrical portion 31a of the joint body 31, the members 32 to 35 housed in the distal end side circular recess 31e are caps 36. However, as will be described later, the ink supply port 51e side of the socket body 51 of the socket portion 50 can be advanced and retracted in the distal end side circular recess 31e and in the large-diameter round hole 36a of the cap 36.

(Socket part 50)
As shown in FIGS. 4C and 4D, the socket portion 50 provided in the ink cartridge 40 has an inner peripheral side cylindrical portion 51f formed on the front end side of the socket body 51 and a front end side annular recess 51af side on the printing device. 10 is configured as a side to be fitted to the joint portion 30 provided in the inside.

  And the socket main body 51 used as the base | substrate of the socket part 50 is integrally formed using the resin material similarly to the joint main body 31. FIG.

  In the socket body 51 described above, the outer peripheral large-diameter cylindrical portion 51a is larger in diameter than the first and second outer peripheral cylindrical portions 31a and 31b of the joint main body 31 at the tip portion facing the joint main body 31 of the joint portion 30. The first and second outer circumferential cylindrical portions 31a and 31b are formed to have a length that can accommodate the tip portions thereof.

  Further, the socket body 51 is connected to the rear side of the outer peripheral side large-diameter cylindrical part 51a, the outer peripheral side circular convex part 51b is formed to be shorter and larger in diameter than the outer peripheral side large diameter cylindrical part 51a, and the outer peripheral side circular convex part The outer peripheral side tapered cylindrical portion 51c is formed in a short length so that the outer diameter gradually decreases toward the rear end side, connected to the rear of the portion 51b.

  Further, the socket main body 51 is connected to the rear side of the outer peripheral side tapered cylindrical part 51 c and the outer peripheral side small diameter cylindrical part 51 d is formed to the vicinity of the front surface 60 a of the ink storage container 60.

  In addition, the socket body 51 has an inner peripheral side cylindrical portion 51f having an ink supply port 51e opened at the distal end surface larger than the diameter of the insertion shaft 31f, in the large-diameter round hole 36a of the cap 36 and the distal end side of the joint body 31. It is formed so that it can advance and retreat in the circular recess 31e.

  A long insertion shaft 31f formed in the joint body 31 can be moved forward and backward in the ink supply port 51e, and the inner peripheral surface of the outer peripheral side large diameter cylindrical portion 51a and the outer periphery of the inner peripheral side cylindrical portion 51f. A tip-side annular recess 51af having an annular (ring-shaped) space is formed in a concave shape on the tip side.

  Further, the first circular recess 51g, the tapered recess 51h, and the second circular recess 51i are stepped so that the inner diameter increases in this order from the rear of the ink supply port 51e of the socket body 51 toward the rear end of the socket body 51. Is formed.

  In the first circular recess 51g, the tapered recess 51h, and the second circular recess 51i of the socket body 51, the inner plug 53 extends in the front-rear direction along the axis of the long insertion shaft 31f formed on the joint body 31. It is stored in a movable manner.

  The above-described inner plug 53 is installed in the socket main body 51 so as to face the ink supply port 51e, and is moved toward the ink supply port 51e by an urging force from the ink storage container 60 side, whereby the ink supply port 51e. It has a function of sealing the ink path to.

  Further, the inner plug 53 is connected to the front end side cylindrical portion 53a formed in a stepped cylindrical shape on the front end side facing the ink supply port 51e of the socket main body 51 and the rear side of the front end side cylindrical portion 53a and has a small diameter and a long length. A thin shaft portion 53b formed in a scale is integrated.

  At this time, the front end side cylindrical portion 53a formed in a stepped cylindrical shape on the front end side of the inner plug 53 is larger than the inner diameter of the first circular recess 51g of the socket body 51, as shown in FIG. A small-diameter cylindrical portion 53aa having a small-diameter outer peripheral surface, and an outer peripheral surface connected to the rear of the small-diameter cylindrical portion 53aa and having the same diameter as the inner diameter of the first circular concave portion 51g, along the first circular concave portion 51g. A large-diameter cylindrical portion 53ab that is slidably fitted, a groove portion 53ac that is connected to the rear of the large-diameter cylindrical portion 53ab and that fits a seal member 54 using an O-ring, and that is connected to the rear of the groove portion 53ac, and The flange portion 53ad has an outer peripheral surface that is larger than the inner diameter of the first circular recess 51g and smaller than the inner diameter of the second circular recess 51i.

  Then, a seal member (hereinafter referred to as an O-ring) 54 is fitted into the groove 53ac from the front end side of the front end side cylindrical portion 53a of the inner plug 53, and this O ring 54 is brought into contact with the flange portion 53ad on the rear end side. ing. Thus, when the inner plug 53 moves toward the ink supply port 51 e of the socket main body 51, the O-ring (seal member) 54 is located between the socket main body 51 and the inner plug 53 and the ink IK on the ink storage container 60 side. It has a function to seal.

  In this embodiment, the O-ring 54 is fitted in the groove 53ac of the distal end side cylindrical portion 53a of the inner plug 53. However, the present invention is not limited to this, and the O-ring 54 is formed in the tapered recess 51h of the socket body 51. It can also be fitted.

  From the above, the large diameter cylindrical portion 53ab formed in the distal end side cylindrical portion 53a of the inner plug 53 and the O-ring 54 fitted in the groove portion 53ac of the distal end side cylindrical portion 53a of the inner plug 53 are used as the ink supply port of the socket body 51. An ink sealing portion that seals the ink path to 51e is configured.

  Further, a concave-shaped ink holding portion 53a1 having an opening is provided as a bottomed hole on the distal end side cylindrical portion 53a of the inner plug 53 so as to face the ink supply port 51e of the socket body 51.

  The ink holding portion 53a1 is provided with a first opening on the side of the joint body 31 where the insertion shaft 31f is inserted. As shown in FIG. 4D, the hole diameter φD of the ink holding portion 53a1 is set to the insertion shaft 31f. The shaft diameter φd is slightly larger (φD> φd), and the depth of the ink holding portion 53a1 is formed at a predetermined depth F. For example, when the shaft diameter φd of the insertion shaft 31f is 2 mm, the hole diameter φD of the ink holding portion 53a1 is formed to 2.5 mm, and the predetermined depth F of the ink holding portion 53a1 is in the range of 6 mm to 14 mm. It is set.

  The ink holding portion 53a1 formed on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53 is a part of the main part of this embodiment, and as described in the operation described later, the joint main body 31. Is inserted into the socket main body 51, the insertion shaft 31f of the joint main body 31 is inserted, and the inner plug 53 is pressed backward by the tip sharp portion 31f1 of the insertion shaft 31f.

  Further, the ink holding part 53a1 can suck and hold the ink IK present in the vicinity of the ink supply port 51e of the socket body 51 when the insertion shaft 31f inserted here is pulled out. .

  Further, the ink holding portion 53a1 formed on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53 is provided with one or more second openings 53a6 in addition to the first opening described above. The second opening 53a6 is between the position of the first opening of the ink holding portion 53a1 in the axial direction of the insertion shaft 31f and the sealing position by the O-ring (seal member) 54, and is within the ink holding portion 53a1. To the outer peripheral surface of the distal end side cylindrical portion 53a of the inner plug 53 and is provided in a round hole shape (or slit shape).

  At this time, the second opening 53a6 is provided on a surface different from the surface on which the first opening of the ink holding portion 53a1 is located in the axial direction of the insertion shaft 31f. Hereinafter, the second opening 53a6 is referred to as “second opening 53a6”. Will be referred to as “through hole 53a6”.

  One or more through holes (second openings) 53a6 are also part of the main part of this embodiment, like the ink holding portion 53a1.

  In this embodiment, the plurality of through holes 53a6 are formed at, for example, approximately 90 ° intervals along the outer peripheral surface of the distal end side cylindrical portion 53a of the inner plug 53, but the number of the through holes 53a6 is one or more. If there is, it is good.

  Here, the reason why one or more through holes 53a6 are provided so as to communicate with each other between the ink holding portion 53a1 and the outer peripheral surface of the distal end side cylindrical portion 53a will be described.

  As described above, the ink holding portion 53a1 is deeply formed with a predetermined depth F on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53 in accordance with the long insertion shaft 31f formed in the joint body 31. Therefore, as compared with the case where the insertion shaft (not shown) as disclosed in Patent Document 2 is short, the time for the long insertion shaft 31f to enter the ink holding portion 53a1 is shortened.

  Therefore, in a state where the joint portion 30 and the socket portion 50 are not fitted, the time during which the insertion shaft 31f is inserted into the ink holding portion 53a1 becomes longer, and the ink IK stored in the ink holding portion 53a1 is supplied with ink. There is a risk of flowing out in the direction of the mouth 51e. In order to prevent this, when the insertion shaft 31f is inserted into the ink holding portion 53a1, while pushing the ink IK in the ink holding portion 53a1 by the insertion shaft 31f, the tip side cylindrical portion 53a is inserted from one or more through holes 53a6. It extrudes to the outer peripheral surface side.

  On the other hand, when the insertion shaft 31f is pulled out from the ink holding portion 53a1, the ink holding portion 53a1 is so deep that the ink IK cannot be drawn into the ink holding portion 53a1, and a sufficient amount of ink is placed in the ink holding portion 53a1. There is a risk that it cannot be retained. In order to prevent this, the ink IK in the vicinity of the outer peripheral surface of the distal end side cylindrical portion 53a of the inner plug 53 can be drawn into the ink holding portion 53a1 from one or more through holes 53a6.

  Further, after the compression spring 55 is inserted into the small-diameter shaft portion 53 b of the inner plug 53, the small-diameter shaft portion 53 b is fitted into the shaft hole 56 a of the bearing member 56, and the bearing member 56 is connected to the socket body 51. The two circular recesses 51i are fixedly supported between the front surface 60a of the ink storage container 60.

  When the ink cartridge 40 is not used, the inner plug 53 is moved to the ink supply port 51 e side of the socket body 51 by the urging force of the compression spring 55. At this time, the O-ring 54 fitted in the distal end side cylindrical portion 53a of the inner plug 53 is in contact with the flange portion 53ad of the distal end side cylindrical portion 53a and the tapered recess 51h of the socket body 51. Since the ink outflow path 51j formed in the circular recess 51i is closed, the ink IK in the ink storage container 60 is prevented from flowing out to the ink supply port 51e.

  In addition, since the container support cylinder 61 attached to the front surface 60 a of the ink storage container 60 is fitted through the O-ring 62 at the outer peripheral portion of the rear end of the socket main body 51, the socket main body 51 and the ink storage container 60 are connected to each other. Ink leakage is prevented even between the two.

  Next, the operation of the ink cartridge 40 according to the present invention configured as described above will be described in the order of operation with reference to FIGS.

FIGS. 5A to 5C sequentially show the operation of fitting the socket portion of the ink cartridge to the joint portion in the printing apparatus. 6A to 6D sequentially show the operation of pulling out the joint portion in the printing apparatus from the socket portion of the ink cartridge.
(Operation for fitting the socket part 50 to the joint part 30)
First, in FIG. 5A, immediately after the ink cartridge 40 is connected to the holder 21 fixedly arranged on the cartridge mounting mechanism portion 20, the joint portion 30 supported by the holder 21 so as to be movable back and forth is the socket portion 50. The state before fitting is shown.

  At this time, the state in which the joint portion 30 is fitted into the socket portion 50 means that the cap 36 side of the joint portion 30 enters the tip-side annular recess 51af of the socket body 51 and is provided in the joint body 31. Since the ring 35 is in sliding contact with the inner peripheral cylindrical portion 51f formed on the inner peripheral tip side of the socket body 51, the O-ring 35 is separated from the inner peripheral cylindrical portion 51f in the case of FIG. Therefore, it is in a state before mating.

  When the ink cartridge 40 is connected to the holder 21, the color information of the ink IK is received from the IC tag 42 attached to the outer box 41 of the ink cartridge 40 by the IC tag receiver 12 provided in the printing apparatus 10. Then, since the control unit (not shown) determines whether or not the color information of the ink IK matches the holder 21 to which the corresponding color ink cartridge 40 is attached, the color difference between the ink colors can be detected first. .

  Further, the joint drive unit 10 of the printing apparatus 10 and the socket unit 50 of the ink cartridge 40 are opposed to each other with a slight gap, and the cam drive mechanism unit 11 that moves the joint unit 30 toward the socket unit 50 is provided. Stopped and in standby.

  That is, on the joint portion 30 side, the long insertion shaft 31f formed at the center portion in the distal-end-side circular recess 31e of the joint body 31 is in front of the cap 36 attached to the first outer peripheral side cylindrical portion 31a of the joint body 31. Protruding.

  On the other hand, on the socket part 50 side, the inner plug 53 in which the O-ring 54 is fitted into the distal end side cylindrical part 53a is a compression spring in the first circular concave part 51g, the tapered concave part 51h, and the second circular concave part 51i of the socket body 51. The ink supply port 51e is closed by moving to the front ink supply port 51e side by the urging force of 55.

Further, the insertion shaft 31 f of the joint body 31 enters the ink supply port 51 e of the socket body 51 of the socket portion 50, and the tip sharp portion 31 f 1 of the insertion shaft 31 f is the front in the first circular recess 51 g of the socket body 51. At this time, the ink holding portion 53a1 formed in the distal end side cylindrical portion 53a of the inner plug 53 and the plurality of through holes 53a6 are faced. The inside is hollow only at the first time when the insertion shaft 31f is not inserted, but after the insertion shaft 31f is inserted and removed once, the ink IK that has entered here is collected.

  Next, FIG. 5B shows a state immediately before the inner plug 53 in the socket body 51 is pushed backward by the insertion shaft 31 f of the joint body 31.

  Here, the cam drive mechanism part 11 is started and the joint part 30 is moved forward toward the socket part 50. Then, the side of the cap 36 attached to the first outer peripheral side cylindrical portion 31 a of the joint body 31 enters a distal end side annular recess 51 af formed on the distal end side of the socket body 51.

  Accordingly, the ink supply port 51 e side of the socket body 51 enters the cap 36, the O-ring 35 and the O-ring pressing member 34 in the joint body 31 in order, so that the ink flows out by the urging force of the compression spring 32 in the joint body 31. Three protrusions 33 c (FIG. 4) formed on the prevention member 33 come into contact with the outer surface of the socket body 51 that forms the ink supply port 51 e.

  At the same time, the insertion shaft 31f of the joint body 31 is inserted into the ink holding portion 53a1 formed on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53 that is moving forward in the first circular recess 51g of the socket body 51. Is done.

  Here, as the insertion shaft 31f is inserted from the first opening of the ink holding portion 53a1 toward this depth, the ink IK accumulated in the ink holding portion 53a1 is pushed by the insertion shaft 31f while the ink is being pushed by the insertion shaft 31f. The ink IK flows out from the first opening of the ink holding portion 53a1 because it is pushed out of the outer peripheral surface of the front end side cylindrical portion 53a through the plurality of through holes 53a6 formed in the rear portion of the holding portion 53a1. Can be prevented.

  The sharp tip 31f1 of the insertion shaft 31f of the joint body 31 contacts the bottom of the ink holding portion 53a1 formed in the distal end side cylindrical portion 53a of the inner plug 53, but the inner plug 53 has not moved rearward yet. The ink IK in the socket main body 51 is shielded by the inner plug 53.

  Next, FIG. 5C shows a state in which the inner plug 53 in the socket main body 51 is pushed backward by the insertion shaft 31 f of the joint main body 31.

  Here, when the cam drive mechanism 11 is continuously operated from the state of FIG. 5B and the joint 30 is further moved toward the socket 50, the first outer peripheral cylindrical portion 31a of the joint body 31 is obtained. The side of the cap 36 attached to the inner side of the socket main body 51 enters into the inner end of the front end side annular recess 51af formed on the front end side of the socket body 51.

  Accordingly, the three protrusions 33c (FIG. 4) formed on the ink outflow prevention member 33 in the joint body 31 are pushed rearward on the outer surface forming the ink supply port 51e of the socket body 51. The compression spring 32 is contracted.

  Then, the sharp tip 31f1 of the insertion shaft 31f of the joint body 31 pushes the ink holding portion 53a1 of the inner plug 53 accommodated in the socket body 51 against the compression spring 55 to the opposite side to the ink supply port 51e. An ink outflow path 51j is formed in the first circular recess 51g, the tapered recess 51h, and the second circular recess 51i of the socket body 51.

  Furthermore, since the inner peripheral side cylindrical portion 51 f of the socket main body 51 abuts on the inner peripheral surface of the O-ring 35 accommodated in the joint main body 31, ink leakage in the joint main body 31 can be prevented.

  Thus, the ink IK in the socket body 51 enters the joint body 31 from the ink supply port 51e through the ink outflow path 51j formed in the socket body 51, and the ink inflow path formed in the joint body 31. 31g is supplied to the printing apparatus 10 side.

(Operation of pulling out joint part 30 from socket part 50)
When the joint portion 30 in the printing apparatus 10 is pulled out from the socket portion 50 in the ink cartridge 40, the operations in FIGS. 5 (c) to (a) are opposite to the operations in FIGS. 5 (a) to (c) described above. ) In this order, it will be described with reference to FIGS. 6 (a) to 6 (d).

  First, the state shown in FIG. 6A is the same as the state shown in FIG. 5C described above, and the cap 36 side of the joint portion 30 is in the tip-side annular recess 51af of the socket body 51. The joint portion 30 is fitted into the socket portion 50 after entering the interior.

  At this time, the tip sharp portion 31 f 1 of the insertion shaft 31 f of the joint body 31 is in contact with the bottom of the ink holding portion 53 a 1 formed on the tip side cylindrical portion 53 a of the inner plug 53 that has moved backward in the socket body 51. Further, since the ink supply port 51e of the socket body 51 is opened by the rearward movement of the inner plug 53, the ink IK in the socket body 51 is supplied into the joint body 31 from the ink supply port 51e.

  Next, the state shown in FIG. 6B is the cam drive mechanism portion in the direction (arrow direction) in which the insertion shaft 31f of the joint body 31 is pulled out from the ink holding portion 53a1 formed in the distal end side cylindrical portion 53a of the inner plug 53. 11 is operated to release the pressure on the inner plug 53 by the insertion shaft 31f, but the joint portion 30 is retracted forward in the annular recess 51af on the distal end side of the socket body 51 while being fitted to the socket portion 50. doing.

  Then, following the withdrawal of the insertion shaft 31 f of the joint body 31, the inner plug 53 fitted with an O-ring (seal member) 54 moves forward in the socket body 51 by the urging force of the compression spring 55 to supply ink. Since the opening 51e is closed, the ink outflow path 51j is sealed.

  At this time, the sharp tip 31 f 1 of the insertion shaft 31 f of the joint body 31 remains in contact with the bottom of the ink holding portion 53 a 1 of the inner plug 53 by the urging force of the compression spring 55.

  Next, in the state shown in FIG. 6C, when the cam drive mechanism 11 is continuously operated from the state shown in FIG. 6B, the insertion shaft 31 f of the joint main body 31 becomes the ink holding part of the inner plug 53. It moves to the direction (arrow direction) further pulled out from 53a1, and it will be in the state which released the fitting with the joint part 30 and the socket part 50. FIG.

  Here, the inner plug 53 is stopped because it has already been moved forward in the socket main body 51. When the insertion shaft 31f is moving in the direction of pulling out from the ink holding portion 53a1 (in the direction of the arrow), the first circular concave portion 51g of the socket body 51 and the outer peripheral surface of the distal end side cylindrical portion 53a of the inner plug 53 The ink IK collected in the meantime is drawn into the ink holding portion 53a1 of the inner plug 53 through a plurality of through holes (second openings) 53a6 formed in the distal end side cylindrical portion 53a of the inner plug 53.

  On the other hand, the movement of the joint portion 30 in the direction of the arrow causes the cap 36 side of the joint portion 30 to come out of the tip-side annular recess 51af of the socket body 51 and the O-ring 35 provided in the joint body 31 to Since it separates from the inner peripheral side cylindrical part 51f formed in the inner peripheral front end side, the fitting between the joint part 30 and the socket part 50 is released.

  At this time, the tip sharp part 31f1 of the insertion shaft 31f of the joint body 31 moves backward to the front of the ink holding part 53a1 of the inner plug 53, but does not come out of the ink holding part 53a1.

  Next, in the state shown in FIG. 6D, the insertion shaft 31f of the joint main body 31 is moved into the inner plug 53 by further operating the cam drive mechanism 11 from the state shown in FIG. In this case, the insertion shaft 31f of the joint main body 31 is completely pulled out from the ink holding portion 53a1 of the inner plug 53.

  Here, as described in FIG. 6C, the ink outflow path 51 j in the socket body 51 is sealed, and the insertion shaft 31 f of the joint body 31 is inserted into the ink holding portion 53 a 1 of the inner plug 53. When the insertion shaft 31f is pulled out from the state where it is, negative pressure is generated with respect to the ink holding portion 53a1 and / or surface tension is generated between the ink holding portion 53a1 and the ink IK. It is possible to generate a force that cancels the scattering of the ink IK that occurs when the fitting with the portion 50 is released.

  At this time, as described above, the shaft diameter φd of the insertion shaft 31f of the joint body 31 {FIG. 3 (d)} is set smaller than the hole diameter φD of the ink holding portion 53a1 of the inner plug 53 {FIG. 3 (d)}. However, if the gap between the both 31f and 53a1 is small, the influence by the negative pressure becomes large. On the other hand, if the gap between the both 31f and 53a1 is large, the influence by the surface tension becomes large.

  As a result, the ink IK existing in the vicinity of the ink supply port 51e of the socket body 51 is sucked and held in the ink holding portion 53a1, so that the socket can be removed even if the joint portion 30 and the socket portion 50 are repeatedly detached. The ink IK can be prevented from dripping from the ink supply port 51e of the main body 51.

  Further, when the insertion shaft 31f is pulled out from the ink holding portion 53a1, the ink IK in the vicinity of the outer peripheral surface of the distal end side cylindrical portion 53a of the inner plug 53 also passes through the plurality of through holes (second openings) 53a6. Since the ink is drawn into 53a1, the ink IK can be sufficiently drawn into the ink holding portion 53a1 even if the depth of the ink holding portion 53a1 is deep.

  Even if the ink cartridge 40 is removed from the printing apparatus 10, the ink IK held in the ink holding portion 53a1 of the inner plug 53 can be prevented from dripping from the ink holding portion 53a1 due to surface tension. It can be carried around.

  Therefore, as described above with reference to FIGS. 6A to 6D, when the socket part 50 is pulled out from the joint part 30, the pressure of the ink holding part 53a1 by the insertion shaft 31f is released to seal the ink path. Later, the fitting state of the joint part 30 and the socket part 50 is released, and then the insertion shaft 31f is pulled out from the ink holding part 53a1.

  Next, one or more ink holding portions 53a1 to 53a5 formed in the distal end side cylindrical portion 53a of the inner plug 53, and one or more ink communication portions 53a1 to 53a5 and the outer peripheral surface of the distal end side cylindrical portion 53a of the inner plug 53 are communicated. Several examples of the shapes of the through holes (second openings) 53a6 to 53a8 will be described with reference to FIGS.

  First, in the embodiment shown in FIG. 7A, as described above, the ink holding portion 53a1 is formed as a cylindrical concave bottomed hole on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53. In addition, a plurality of through holes 53a6 are formed in a round hole shape so as to communicate from the outer peripheral surface of the front end side cylindrical portion 53a to the back side portion in the ink holding portion 53a1.

  Next, in the first modification shown in FIG. 7B, the ink holding portion 53a1 is formed as a cylindrical concave bottomed hole on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53 as in the embodiment. In addition, unlike the embodiment, a plurality of through holes 53a7 are formed in a slit shape so as to communicate from the outer peripheral surface of the front end side cylindrical portion 53a between the front end portion and the back side portion in the ink holding portion 53a1. ing.

  Next, in the modified example 2 shown in FIG. 7C, the ink holding portion 53a2 is formed as a quadrangular prism-shaped concave bottomed hole on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53, and A plurality of through holes 53a6 are formed in a round hole shape so as to communicate from the outer peripheral surface of the front end side cylindrical portion 53a to the back side portion in the ink holding portion 53a2.

  Next, in Modification 3 shown in FIG. 7 (d), the ink holding portion 53a3 is formed as a quadrangular pyramidal concave bottomed hole on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53, and One through hole 53a8 is formed in an L-shaped round hole shape so as to communicate with the apex of the quadrangular pyramid in the ink holding portion 53a3 from the outer peripheral surface of the distal end side cylindrical portion 53a.

  Next, in the modified example 4 shown in FIG. 7E, the ink holding portion 53a4 is formed as a bottomed hole having a two-stage columnar deep concave shape on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53. In addition, one through hole 53a6 is formed in a round hole shape so as to communicate from the outer peripheral surface of the distal end side cylindrical portion 53a to the back side portion in the ink holding portion 53a4.

  Next, in the modified example 5 shown in FIG. 7F, the ink holding portion 53a5 is formed as a bottomed hole having a two-stage columnar front wide concave shape on the distal end side of the distal end side cylindrical portion 53a of the inner plug 53. In addition, one through hole 53a7 is formed in a slit shape so as to communicate from the outer peripheral surface of the front end side cylindrical portion 53a between the intermediate portion and the back side portion in the ink holding portion 53a5.

  As described above, the insertion shaft 31f is formed in the joint body 31 in a shape extending in the axial direction, and the tip of the insertion shaft 31f is pressed corresponding to the shape of each of the ink holding portions 53a1 to 53a5 described above. In the case where the ink cartridge 40 is formed so as to be able to be formed, each of the ink holding portions 53a1 to 53a5 is formed in a concave portion having a surface parallel to the axis of the insertion shaft 31f in the above-described embodiments and modifications 1 to 5. The ink IK can be prevented from dripping from the ink supply port 51e with respect to the gravitational direction even if it is installed at an angle of about 2 ° in the printing apparatus 10.

  In addition, one or more through holes (second openings) 53a6 to 53a8 communicating the outer peripheral surface of the front end side cylindrical portion 53a of the inner plug 53 and the ink holding portions 53a1 to 53a5 are respectively provided to the ink holding portions 53a1 to 53a5. Within the range of the depth F, the position may be formed at any position between the position of the first opening in the axial direction of the insertion shaft 31 f and the sealing position by the O-ring (seal member) 54.

  At this time, the one or more through holes (second openings) 53a6 to 53a8 are formed in the surfaces of the ink holding portions 53a1 to 53a5 in a different surface from the surface where the first openings of the ink holding portions 53a1 to 53a5 are located. When the insertion shaft 31f is inserted into and removed from the ink holding portions 53a1 to 53a5, the ink IK is not affected when the insertion shaft 31f is connected to the rear side position without affecting the first openings of the ink holding portions 53a1 to 53a5. It can be taken in and out between each ink holding part 53a1-53a5 and the outer peripheral surface of the front end side cylindrical part 53a of the inner plug.

  In the ink cartridge 40 according to the present invention described in detail above, an example in which the insertion shaft 31f formed at the central portion in the distal-end-side circular recess 31e of the joint body 31 of the joint portion 30 protrudes forward from the joint body 31 is illustrated. However, the present invention is not limited to this, and the tip side circular recess 31e of the joint body 31 may be extended to the vicinity of the tip sharp part 31f1 of the insertion shaft 31f. This case can be dealt with by forming the tip-side annular recess 51af of the socket body 51 deeply in accordance with the length of the tip-side circular recess 31e of the joint body 31.

  Further, in the ink cartridge 40 according to the present invention, when the socket part 50 is fitted to or pulled out from the joint part 30 in the printing apparatus 10, the joint part 30 is moved back and forth with respect to the socket part 50 by the cam drive mechanism part 11. Although the example of moving in the direction has been described, the present invention is not limited to this, and the joint portion 30 is fixedly installed in the printing apparatus 10, and the socket portion 50 of the ink cartridge 40 is manually set to the fixedly installed joint portion 30. It may be configured to be inserted and removed. Even in this case, if this embodiment is adopted, when the socket part 50 is pulled out from the joint part 30 by manual operation, the pressure of the ink holding part 53a1 by the insertion shaft 31f is released and the ink path to the ink supply port 51e is sealed. After stopping, the fitting state between the joint portion 30 and the socket portion 50 is released, and then the insertion shaft 31f can be pulled out from the ink holding portion 53a1.

DESCRIPTION OF SYMBOLS 10 ... Inkjet printer, 11 ... Cam drive mechanism part, 12 ... IC tag receiver,
15 ... Ink tank, 18 ... Inkjet head,
20 ... cartridge mounting mechanism,
21 ... Holder, 21a ... Front plate, 21b ... Cartridge mounting table,
(21c), 21d ... side plate, 21e ... annular portion, 21e1 ... through hole with guide groove,
21f ... stopper, 22, 23 ... lock member,
30 ... Joint part (male plug part),
31 ... Joint body, 31a ... First outer cylindrical portion, 31b ... Second outer cylindrical portion,
31c ... outer peripheral side convex part, 31d ... flange part, 31e ... tip side circular concave part,
31f ... insertion shaft, 31f1 ... sharp tip, 31g ... ink inflow path,
32 ... Compression spring, 33 ... Ink outflow prevention member, 34 ... O-ring pressing member,
35 ... O-ring, 36 ... cap, 36a ... large diameter round hole,
40. Ink cartridge,
41 ... Outer box, 41a ... Front, 41b, 41c ... Locking recess, 42 ... IC tag,
43. Connecting member,
50 ... Socket part (female socket part),
51 ... Socket body, 51a ... Outer peripheral side large diameter cylindrical part, 51b ... Outer peripheral side circular convex part,
51c ... outer peripheral side tapered cylindrical part, 51d ... outer peripheral side small diameter cylindrical part,
51e... Ink supply port, 51f... Cylindrical portion on the inner periphery side, 51af.
51g ... 1st circular recessed part, 51h ... Tapered recessed part,
51i ... second circular recess, 51j ... ink outflow path 53 ... inner plug, 53a ... tip side cylindrical portion, 53aa ... small diameter cylindrical portion, 53ab ... large diameter cylindrical portion,
53ac ... groove, 53ad ... flange,
53a1 to 53a5 ... an ink holding part having a first opening,
53a6 to 53a8 ... second opening (through hole), 53b ... small diameter shaft portion,
54 ... Sealing member (O-ring), 55 ... Compression spring,
56 ... bearing member, 56a ... shaft hole,
60: Ink storage container, 60a: Front surface, 61: Container support cylinder, 62: O-ring.

Claims (2)

An ink storage container for storing ink;
A socket part provided at one end of the ink storage container, for detaching from the joint part of the printing apparatus;
An ink supply port provided in the socket portion;
An inner plug that is installed opposite to the ink supply port and seals the ink path to the ink supply port by being moved toward the ink supply port by a biasing force from the ink storage container side;
A seal member that seals the ink on the ink storage container side when the inner plug moves to the ink supply port side; and
In mounting the socket portion on the joint portion, in the ink cartridge communicating the ink path by pressing the inner plug against the biasing force by an insertion shaft provided in the joint portion,
The insertion shaft is provided in a shape extending in the axial direction,
The inner plug includes an ink holding portion having an opening,
The ink holding part is
A first opening for inserting and holding the ink in the vicinity of the ink supply port when the insertion shaft is inserted and the inserted insertion shaft is pulled out ;
A second opening that is between the position of the first opening in the axial direction and the sealing position by the seal member and penetrates from the inside of the ink holding portion to the surface of the inner plug;
An ink cartridge comprising:   The ink cartridge according to claim 1, wherein the second opening is provided on a surface different from a surface on which the first opening of the ink holding portion is located in the axial direction.

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