JP3438467B2 - Supply port of ink container and its mold - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply port which is attached to, for example, an ink container for an ink jet recording apparatus and has a sealing member into which a hollow needle for drawing out an ink is inserted, and a molding die for the supply port. The present invention relates to an ink container supply port and its molding die for improving the internal structure of the supply port and making it possible to perform integral molding by devising a method for removing a molding die, thereby reducing the number of parts and the number of assembly steps.

[0002]

2. Description of the Related Art Conventionally, in an ink jet recording apparatus, in order to supply ink to an ink jet recording head (hereinafter referred to as a recording head) mounted on a traveling carriage, first, an ink container is installed in the recording apparatus. There is a method of installing the ink container at a predetermined location and connecting the ink container and the recording head with a flexible ink tube, and another method is to mount the ink container together with the recording head on a traveling carriage. In particular, the mounted ink container often has a replaceable type, that is, a so-called cartridge type.

Now, the conventional ink cartridge supply port as an ink container will be described with reference to FIG. FIG. 9 shows a conventional supply port, (a) is a side sectional view,
(b) is a top view and (c) is a bottom view. In FIG.
A supply port 13 is integrally formed on the peripheral wall of the cartridge body 12 so as to penetrate therethrough. The supply port 13 is integrally formed with the peripheral wall of the cartridge body 12 into a cylindrical portion 14 and an annular portion 15, and the sealing member 7 is press-fitted into the cylindrical portion 14 and the annular portion 16.
Are glued together. That is, the annular portion 15 is located at an intermediate fixed position in the axial direction of the inner peripheral surface of the cylindrical portion 14 (designed to have the same position and thickness as the peripheral wall of the cartridge body 12), and the sealing member 7 is press-fitted therein. It also serves as a stopper that doubles as a stopper. Lid 16
Ink needle 24 shown in broken line through the center hole (see Fig. 11)
Are inserted so as to penetrate the sealing member 7.

Next, the periphery of the supply port 13 and its relation will be described with reference to the sectional view of the ink cartridge 11 of FIG. 10 and the conceptual diagram showing the combination of the ink cartridge 11 and the recording head 23 of FIG. . In FIG. 10, an ink cartridge 11 includes a cartridge body 12 integrally formed with a supply port 13, a lid 16 for the supply port 13, a sealing member 7, a filter 30, an electrode pin 31, a sponge 32, It consists of a lid 33. The sponge 32 is a flexible porous material contained in the internal space of the cartridge body 12, and can hold ink in a form contained therein. In this way the cartridge body
The reason for containing the ink through the sponge 32 instead of directly containing the ink in the recording head 23 is the recording head 23 described later (see FIG. 11).
The ink supply pressure to the ink cartridge can be constant regardless of ink consumption, and the ink cartridge 11 can be installed in any posture.

Further, in FIG. 10, the sealing member 7 is made of an ink-resistant elastic material such as rubber, and is press-fitted into the internal space of the supply port 13 of the cartridge body 12 and then stopped by the lid 16 as described above. To be Furthermore, when the recording head unit 21 and the ink cartridge 11 are combined as shown in FIG.
It is possible to supply the ink from the ink cartridge 11 to the recording head 23 while penetrating through the ink and sealing the leakage to the outside. The filter 30 removes fine dust and the like in the ink contained in the sponge 32 and supplies it to the recording head 23 (see FIG. 11). The electrode pin 31 is for electrically detecting ink shortage. The lid 33 prevents the sponge 32 built in the cartridge body 12 from coming off.

In FIG. 11, the ink cartridge 11 is inserted into the recording head unit 21 in the direction of the arrow, and the ink needle 24 is inserted into the supply port 13 of the recording head unit 21 so as to be integrated. It will be mounted on a carriage (travel base) not shown. Here, the recording head unit 21 includes a holder 22 that stores and holds the inserted ink cartridge 11, a recording head 23, and an ink needle 24.
And an ink passage 25. A portion excluding the recording head 23 is integrally molded to form a base 21a (the ink needle 24 is inserted and molded), and the recording head 23 is inserted and installed at a concave mounting position on the lower surface of the base 21a.

[0007]

[Problems to be Solved by the Invention] As described above,
The ink inlet 11 of the conventional ink cartridge 11 has a space inside the cylindrical portion 14 on the ink outlet side from the annular portion 15 (see FIG. 9).
The sealing member 7 is press-fitted into the lower space (a), and then the lid 16 is bonded and stopped. Therefore, in addition to the supply port 13, a lid 16 is required as a separate component, and the cylindrical portion 14
A step of adhering to the end surface of the ink lead-out side is required. In other words, the supply port 13 and the lid 16 cannot be integrally molded.

The problem to be solved by the present invention is to solve the above problems of the prior art, to improve the internal structure of the supply port, and to enable the integral molding by devising the die cutting. An object of the present invention is to provide a supply port for an ink container and a molding die for the same, which can reduce the number of parts and the number of assembling steps.

[0009]

A supply port according to the present invention is a supply port which is attached to an ink container and contains a sealing member into which a hollow needle for drawing out an ink is to be inserted. An outer stopper for holding the sealing member provided at the end of the peripheral surface on the ink outlet side, and an inner stopper for holding the sealing member provided at a fixed position in the axial direction of the inner peripheral surface of the cylindrical portion, The outer stop portion extends from the inner peripheral surface toward the central portion. For example, a plurality of fan-shaped protrusions are arranged side by side along the inner peripheral circle. For example, a plurality of fan-shaped protrusions project toward the portion, and are arranged in parallel along the inner circumference circle so as to face each hollow portion between the adjacent protrusions of the outer stopper and have the same shape. It has been configured.

Here, it is preferable that each of the protrusions of the outer stopper has a chamfer at the tip ridge portion of the surface of the ink outlet side so that it is convenient for press-fitting and incorporating the sealing member.
Therefore, the sealing member is partially compressed and deformed, and is press-fitted / installed in the space defined by the cylindrical portion, the outer stopper portion, and the inner stopper portion. A molding die according to the present invention is a molding die according to the above-mentioned supply port, which is used to mold an outer contour on the ink lead-out side of the supply port contour and an inner contour on the opposite side, respectively. It consists of an outer mold and an inner mold as described.

In the invention according to claim 3, the outer mold is
The portion that forms the inner contour of the supply port is a flat surface portion that forms the outer end surface of the cylindrical portion; and the outer stop portion that is erected on this and extends in the axial direction to the surface position on the ink outlet side of the inner stop portion that is adjacent A columnar part having a cross section of the same shape at each hollow position between the protruding parts, the inner mold having a portion for forming the inner contour of the supply port, and a flat surface for forming the inner end surface of the cylindrical part. A cylindrical portion that is erected on the cylindrical portion and has an inner diameter of the cylindrical portion as an outer diameter and extends in the axial direction to a surface position on the side opposite to the ink lead-out side of the outer stopper portion; A groove extending in the axial direction from the surface position on the side opposite to the ink lead-out side of the inner stopper at the position of the protrusion to the tip with the same cross section; the envelope of the groove bottom surface coaxially connected to the tip of the cylinder Cylindrical tip with outer surface as outer circumference and outer stop thickness as height When; comprises a configuration that.

Therefore, the outer mold and the inner mold can be moved closer to each other in the common axial direction during the fitting and fitted through the corresponding columnar portions and grooves, and can be separated from each other after the molding. In the invention according to claim 4,
The outer die has a flat portion for shaping the inner contour of the supply port and a flat portion for shaping the outer end surface of the cylindrical portion; and is erected on the flat portion, and the inner diameter of the cylindrical portion is the outer diameter, and the surface position on the ink outlet side of the inner stopper is A cylindrical part extending in the axial direction up to;
A groove that extends in the axial direction with a cross section of the same shape at each protruding portion of the outer stopper; coaxially connected to the tip of the cylindrical portion, with the envelope surface of the groove bottom as the outer circumference, and increasing the thickness of the inner stopper. The inner die has a flat portion, which forms the inner contour of the supply port, and a flat portion, which forms the inner end surface of the cylindrical portion; And a columnar part whose outer diameter is the inner diameter of the cylindrical part, which extends in the axial direction to the surface position on the opposite side to the surface position; A columnar portion having a cross section of the same shape at the position of each hollow portion between the adjacent protruding portions of the outer stop portion that extends;
It is a structure.

Therefore, the outer die and the inner die can be moved closer to each other in the common axial direction at the time of molding, fitted through the corresponding grooves and columnar portions, and can be separated from each other by moving after molding.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a supply port 3 (embodiment), and a cartridge body 2 integrally formed with the supply port 3 is not shown. In FIG. 1, a supply port 3 is provided at a cylindrical portion 4 and an end portion of the cylindrical portion 4 on the ink outlet side (a lower end portion in the drawing) for holding a sealing member 7 (see FIG. 9). It is composed of an outer stop portion 5 and an inner stop portion 6 which is provided at an intermediate fixed position in the axial direction of the cylindrical portion 4 and holds the sealing member 7. Here, the outer stopper 5
Is a fan-shaped protrusion 5a having a central angle of 60 degrees and extending from the inner peripheral surface of the end portion of the cylindrical portion 4 on the ink outlet side toward the center. The inner stopper 6 is provided on the inner peripheral surface of the cylindrical portion 4 toward the center from the inner peripheral surface of the intermediate fixed position and has a central angle of 60 degrees.
3 are arranged side by side in three equal parts along the inner circumference circle. Moreover, the protrusions 6a of the inner stopper 6 face the fan-shaped hollow portions 5b between the adjacent protrusions 5a of the outer stopper 5 and have the same shape. In other words,
The three protrusions 5a of the outer stopper portion 5 and the three protrusions 6a of the inner stopper portion 6 respectively have the same fan surface shape, and do not overlap each other when viewed from the axial direction of the cylindrical portion 4, 60
Positioned in a form that is offset by a degree. The outer stopper 5
The protrusions 5a of the inner side stopper 6 and the protrusions 5a of the inner side stopper 6 are not necessarily limited to three pieces having the same size and fan surface shape, which are arranged in three equal parts on the inner circumference circle. 5
It is necessary that the protrusions 5a and the protrusions 6a of the inner stopper 6 are equal in number to each other so that they do not overlap with each other when viewed from the axial direction and that they are displaced so as not to create a gap. This condition is necessary in the structure of the molding die for integrally molding the supply port 3 as described later. Although not shown here, each protrusion 5a of the outer stopper 5 is chamfered on the tip ridge portion of the surface on the ink lead-out side (lower side in the figure) (see FIG. 2 (a) described later). reference).

The supply port 3 will be supplementarily described with reference to FIG. 2A is a side sectional view, FIG. 2B is a top view, and FIG. 2C is a bottom view. In FIG. 2 (a), the supply port 3 is formed on the peripheral wall of the cartridge main body 2 so as to penetrate therethrough.
Are integrally molded. The supply port 3 is provided with the peripheral wall of the cartridge main body 2, the cylindrical portion 4, and the outer stop portion 5 (see FIG.
(c) Projection part 5a) and inner stop part 6 (projection part of Figure (b))
6a) is integrally molded, and a chamfer 5c is applied to the tip ridge portion of the lower surface of each protrusion 5a of the outer stopper 5.

The sealing member 7 is press-fitted and built in a cylindrical space defined by the cylindrical portion 4, the outer stopper 5, and the inner stopper 6. Here, as described above, the protrusions 5a of the outer stopper 5 are chamfered 5c at the tip ridge of the surface of the ink outlet side (lower side in the figure), so that the sealing member 7 is made of alcohol. When it is moistened with, for example, and pushed upward from the lower surface, it can be easily press-fitted and built into the internal space through each hollow portion 5b of the outer stopper 5 (compressed and deformed at each protruding portion 5a). . It should be noted that when press-fitting, the three protruding portions of the inner stopper 6 are
6a acts as a stopper that also serves as a stopper.

The reason why the internal structure of the supply port 3 is devised in this way is to enable the integral molding by using a corresponding molding die, and two examples of this molding die will be described below. . The first and second molding dies are an inner mold for molding the inner contour of the cartridge body 2 and the supply port 3 on the side opposite to the ink outlet side, and an outer mold for molding the outer contour of the ink outlet side. It is composed of a mold, and can be molded and die-cut by approaching and separating both in the axial direction of the supply port 3.

FIGS. 3A and 3B relate to the inner mold 45 of the first molding die, in which FIG. 3A is a side sectional view and FIG. 3B is a lateral sectional view (UU section in FIG. 3A).
The inner mold 45 has a cylindrical portion 47 and a tip end portion in which a portion for molding the inner contour of the supply port 3 (see FIG. 2, hereinafter the same) is erected on a flat surface portion 46 for molding the inner end surface of the cylindrical portion 4 and extends downward. It consists of 49. The cylindrical portion 47 has an inner diameter of the cylindrical portion 4 of the supply port 3 as an outer diameter, and an axis line from the inner end surface of the cylindrical portion 4 (corresponding to the flat surface portion 46) to the surface position of the outer stopper portion 5 opposite to the ink outlet side. Is a member extending in the direction from the surface position opposite to the ink lead-out side of each fan-shaped projecting portion 6a of the inner stop portion 6 to the tip end with three grooves 48 having the same cross section. Cut in the direction. The tip portion 49 is a columnar body coaxial with the columnar portion 47, which has the envelope surface of the bottom surface of the groove 48 as the outer circumference and has the thickness of the protruding portion 5a of the outer stop portion 5 as the height.

FIG. 4 relates to the outer mold 40 of the first molding die, (a) is a side sectional view, and (b) is a lateral sectional view (VV section of (a)).
The outer die 40 has a flat portion 41 that forms the outer end surface of the cylindrical portion 4 and a three columnar portions 42 that are erected on the flat portion 41 and that extend in the axial direction. The columnar portion 42 has a cross section of the same shape at each fan-shaped hollow portion 5b between the adjacent protruding portions 5a of the outer stopper 5, and has an axial direction up to the surface position on the ink lead-out side of the inner stopper 6. Extend to.

FIG. 5 is a side sectional view of the inner mold 45 and the outer mold 40 of the first molding die, and (b) to (d) are transverse sectional views at each position ((a)). LL, MM, and NN). Therefore, the outer die 40 and the inner die 45 move toward each other in the common axial direction during molding and are fitted through the corresponding columnar portions 42 and the grooves 48, and the gap between them is filled with the molding material and supplied. The mouth 3 (including the ink cartridge 1) is integrally molded. Supplementing a little, as shown in Fig. 5 (a), the outer mold 40 and the inner mold 45
When is fitted, a space is formed between the tip of the columnar portion 42 of the outer die 40 and the root of the groove 48 of the inner die 45 (the cutting start position) (see (b) LL sectional view), and The protrusion 6a of the stopper 6 is molded (see FIG. 2 (b)). In FIG. 5 (a), the outer mold 40
A space is formed between the flat portion 41 of the outer mold 40, the outer mold 40, and the tip 49 of the inner mold 45 (see (d) NN cross-sectional view), and the protrusion 5a of the outer stopper 5 is molded (FIG. See 2 (c), note that the viewing direction is reversed, so the top and bottom are reversed.) In the middle portion (MM cross section) of the columnar portion 42 of the outer mold 40 in FIG. 5 (a), the outer periphery of the fitted cylindrical portion 47 and the outer periphery of the cylindrical portion 47 of the inner mold 45 form a continuous outer periphery. Thus, the inner peripheral portion of the cylindrical portion 4 corresponding to the outer stopper portion 5 and the inner stopper portion 6 is molded (see (c) MM sectional view). Moreover, after molding, the outer mold 40
The inner mold 45 and the inner mold 45 can be separated from each other by separating and moving in the axial direction.

FIG. 6 relates to the inner die 55 of the second mold, (a) is a side sectional view, (b) is a transverse sectional view (XX section of (a)), and FIG. 7 is its outer die 50 ( (a) is a side sectional view, (b) is a transverse sectional view (YY cross section of (a)), FIG. 8 is when the inner die 55 and the outer die 50 are fitted, (a) is a side sectional view, b) to (d) are transverse cross-sectional views (respective cross sections of RR / SS / TT in (a)) at respective positions.

The second mold is an outer mold 50 for molding the outer contour on the ink lead-out side of the contour of the cartridge body 2 including the supply port 3, and an inner mold for molding the inner contour on the opposite side.
It consists of 55. The difference between the second mold and the above-mentioned first mold is that in the first mold, the outer mold 40 is provided with three columnar portions 42 having a fan-shaped cross section, and the inner mold 45 is formed with the columnar portions 42. Although the grooved cylindrical portion 47 to be fitted is provided, instead of this, in the second molding die, the grooved cylindrical portion 52 is provided on the outer die 50 and three fan-shaped cross sections are provided on the inner die 55. That is, the columnar portion 57 is provided.
That is, in the first molding die and the second molding die, the columnar portion and the grooved columnar portion of the fan-shaped cross section that are fitted to each other are replaced by the outer die and the inner die.

That is, in FIG. 6, in the inner mold 55, a portion for shaping the inner contour of the supply port 3 has a flat portion 56 for shaping the inner end surface of the cylindrical portion 4 and an axial direction erected on the flat portion 56. It is composed of a cylindrical portion which is not extended and has three columnar portions 57 connected to the tip thereof. Here, the cylindrical portion is the cylindrical portion 4
The outer diameter of the outer stopper portion 5 is the outer diameter, and the outer stopper portion 5 extends to the surface position on the side opposite to the ink outlet side. The columnar portion 57 is erected on the tip surface of the columnar portion and has the same cross section at the position of each of the three fan-shaped hollow portions 6b of the inner stop portion 6, and is on the side opposite to the ink lead-out side of the outer stop portion 5. It extends to the surface position.

In FIG. 7, the outer die 50 has a flat portion 51 for shaping the inner contour of the supply port 3 and a flat portion 51 for shaping the outer end surface of the cylindrical portion 4, and three portions are provided upright on the flat portion 51. The groove 53 is cut and includes a columnar portion 52 extending to the surface position of the inner stopper portion 6 on the ink outlet side, and a tip portion 54 connected to the tip thereof. The tip end portion 54 is a columnar body coaxial with the columnar portion 52 and having the envelope surface of the bottom surface of the groove 53 as the outer periphery and the thickness of the protruding portion 6a of the inner stop portion 6 as the height.

In FIG. 8, the outer die 50 and the inner die 55 move toward each other in the common axial direction during molding and fit through the corresponding groove 53 and the columnar portion 57, and the molding material is placed in the gap between them. And the supply port 3 (including the ink cartridge 1) are integrally molded. As a supplementary explanation, when the outer die 50 and the inner die 55 are fitted to each other as shown in FIG. 8 (a), between the base of the columnar portion 57 of the inner die 55 and the outer periphery of the tip 54 of the outer die 55. (See (b) RR cross-sectional view), a protrusion 6a of the inner stopper 6 is formed.
Are molded (see FIG. 2 (b)). In FIG. 8A, a space is formed between the flat surface portion 51 and the cylindrical portion 52 of the outer die 50 and the end surface of the cylindrical portion of the inner die 55 (see (d) TT cross-sectional view), and The protrusion 5a is molded (see FIG. 2 (c)). The middle part (SS cross section) of the cylindrical part 52 of the outer mold 50 in FIG. 8 (a)
Then, the outer periphery of the fitted columnar portion 52 and the outer periphery of the columnar portion 57 of the inner die 55 form a continuous outer periphery, so that the cylindrical portion 4 corresponding to the outer stopper portion 5 and the inner stopper portion 6 is formed. The inner peripheral portion of is molded (see (c) SS sectional view). After molding, the outer mold 50 and the inner mold 55 can be separated and moved in the axial direction by being separated from each other. Of course, the supply port 3 molded using the outer mold 50 and the inner mold 55 is the same as that using the first mold.

[0026]

According to the present invention, it is expected that the internal structure of the supply port will be improved and that the molding of the molding die will allow for integral molding, resulting in a reduction in the number of parts and a reduction in the number of assembly steps. it can. That is, as for the above, conventionally, two parts, that is, the cylindrical portion of the supply port and the lid were required, but the lid is integrated with the cylindrical portion to form one component. With regard to the above, the work of adhering the lid to the cylindrical portion could be omitted. Since each protrusion of the outer stopper has a chamfer on the tip ridge of the ink outlet side surface, the work of incorporating the sealing member into the supply port can be performed easily and easily by press fitting, and is almost the same as the conventional one. .

[Brief description of drawings]

FIG. 1 is a perspective view of a supply port (embodiment) according to the present invention.

FIG. 2 is a side sectional view, (b) is a top view, and (c) is a bottom view of the supply port.

FIG. 3 is a side sectional view and (b) is a lateral sectional view of the inner mold of the first molding die for the supply port.

FIG. 4 is a side sectional view of the outer mold of the first molding die,
(b) is a cross-sectional view

[Fig. 5] Fig. 5 shows a state where the inner mold and the outer mold of the first molding die are fitted together (a)
Is a side sectional view, (b) to (d) are transverse sectional views at each position.

FIG. 6 is a side sectional view and (b) is a lateral sectional view of the inner mold of the second molding die for the supply port.

FIG. 7 is a side sectional view of the outer mold of the second molding die,
(b) is a cross-sectional view

[Fig. 8] Fig. 8 shows (a) when the inner mold and the outer mold of the second molding die are fitted together.
Is a side sectional view, (b) to (d) are transverse sectional views at each position.

FIG. 9 is a side sectional view, (b) is a top view, and (c) is a bottom view of a conventional supply port.

FIG. 10 is a sectional view of a conventional ink cartridge.

FIG. 11 is a conceptual diagram showing a combination of a conventional ink cartridge and a recording head.

[Explanation of symbols]

1 ink cartridge 2 Cartridge body 3 supply ports 4 Cylindrical part 5 Outside stop 5a protrusion 5b hollow part 5c Chamfer 6 Inner stop 6a protrusion 6b hollow part 7 Sealing member 40,50 external type 41,46,51,56 Plane part 42,57 Column 45,55 Internal type 47,52 Column 48,53 groove 49,54 Tip

Claims (4)

(57) [Claims] 1. A supply port, which is attached to an ink container and has a built-in sealing member into which a hollow needle for discharging ink is inserted, the supply port being provided at a cylindrical portion and an end portion of the inner peripheral surface of the cylindrical portion on the ink outlet side. An outer stopper for holding the sealing member and an inner stopper for holding the sealing member provided at a fixed position in the axial direction of the inner peripheral surface of the cylindrical portion, the outer stopper extending from the inner peripheral surface to the central portion. A plurality of projecting portions projecting toward each other are juxtaposed along the inner circumference circle, and the inner stop portion has a plurality of projecting portions projecting from the inner peripheral surface toward the center portion. Of the same shape while facing each hollow portion between the adjacent protruding portions of, are arranged in parallel along the inner circumference circle,
A supply port for an ink container, wherein the sealing member is press-fitted and built into a space defined by the cylindrical portion, the outer stopper portion, and the inner stopper portion. 2. The supply port for an ink container according to claim 1, wherein each of the protrusions of the outer stopper has a chamfer at a tip ridge portion of a surface of the ink outlet side. 3. The molding die according to claim 1 or 2, wherein the outer contour on the ink lead-out side of the contour of the supply opening and the inner contour on the opposite side thereof are respectively molded. And the inner mold, and the outer mold has a flat part for molding the inner contour of the supply port and a flat part for molding the outer end face of the cylindrical part; And a columnar portion having a cross-section of the same shape at the position of each hollow portion between the adjacent protruding portions of the outer stopper, which extends in the axial direction; A flat portion that forms the inner end surface of the cylindrical portion;
A cylindrical portion that is erected on this side and that has an inner diameter of the cylindrical portion as the outer diameter and extends in the axial direction to the surface position on the opposite side of the ink outlet side of the outer stopper; A groove that extends in the axial direction from the surface position on the side opposite to the ink outlet side of the inner stopper to the tip with a cross section of the same shape at the position; coaxially connected to the tip of the columnar part, and the envelope surface of the groove bottom is the outer periphery. And a cylindrical tip end having a thickness of the outer stop portion as a height, and the outer mold and the inner mold are moved toward each other in a common axial direction during molding and are fitted to each other through corresponding columnar parts and grooves. The molding die according to the present invention is characterized in that it can be separated and moved from each other after molding and can be separated. 4. A mold for a supply port according to claim 1, wherein an outer mold on the ink lead-out side of the supply port contour and an inner contour on the opposite side thereof are molded respectively. And the inner mold, and the outer mold has a flat portion for shaping the inner contour of the supply port and a flat portion for shaping the outer end surface of the cylindrical portion; A cylindrical portion that extends in the axial direction to the surface position on the ink outlet side; a groove that is formed on the outer periphery and that extends in the axial direction with a cross section of the same shape at the position of each protruding portion of the outer stopper; A cylindrical tip portion that is coaxially connected and that has an envelope surface of the groove bottom surface as an outer periphery and a thickness of an inner stopper portion as a height; A flat portion for molding the end face; and an inner stop portion provided upright on the flat portion A cylindrical part that extends in the axial direction to the surface position on the opposite side to the ink outlet side, and a cylindrical part with the inner diameter as the outer diameter; up to the tip of the cylindrical part up to the surface position on the opposite side of the ink outlet side of the outer stopper part. An outer mold and an inner mold having a columnar portion having a cross-section of the same shape at the position of each hollow portion between the adjacent protruding portions of the outer stopper, which extends in the axial direction; A mold for a supply port of an ink container, wherein the molds move toward each other and are fitted to each other via corresponding grooves and columnar parts, and after molding, they can be separated from each other and separated from each other.