JP2001105624A - Mold for molding ink cartridge, ink cartridge and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the bending, inclination and damage of a mold for molding an ink cartridge caused by the pressing force of a molten resin. SOLUTION: A plurality of gates 41a, 42a, 43a filling a molten resin are provided. The gate 41a is arranged at an almost equal distance from a first side wall filling part 11 and a partition filling part 12 at the upper part of a bottom surface filling part 17a and the gate 42a is arranged at an almost equal distance from partition filling parts 13, 14 at the upper part of a bottom surface filling part 17c and the gate 43a is arranged at an almost equal distance from a partition filling part 15 and a first side wall filling part 16 at the upper part of a bottom filling part 17e. The molten resin from the gate 41a is allowed to fill the first side wall filling part 11 and the partition filling part 12 almost equally and the molten resin from the gate 42a is allowed to fill the partition filling parts 13, 14 almost equally and the molten resin from the gate 43a is allowed to fill the partition filling part 15 and the first side wall filling part 16 almost equally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mold for forming an ink cartridge, an ink cartridge, and a method of manufacturing an ink cartridge.

[0002]

2. Description of the Related Art An ink cartridge of an ink jet printer for performing color printing has a plurality of ink chambers whose interior is partitioned by partitions, and each ink chamber stores color ink of a different color. Can be

For example, when four color inks of cyan, magenta and yellow and black are used, three color inks of cyan, magenta and yellow are usually stored in one ink cartridge having three ink chambers. The black ink is stored in another ink cartridge having one ink chamber. When inks of six colors of cyan, dark cyan, magenta, dark magenta, yellow and black are used, usually,
Five color inks of cyan, dark cyan, magenta, dark magenta and yellow are stored in one ink cartridge having five ink chambers, and black ink is stored in another ink cartridge having one ink chamber. Is stored.

[0004] Such an ink cartridge is generally formed by filling a molten resin into a mold for forming an ink cartridge using an injection molding machine. In this ink cartridge molding die, conventionally, a single gate is filled with a molten resin to form an ink cartridge. FIG. 5 is a sectional view of a main part of an ink cartridge molding die used in a conventional injection molding machine.

[0005] This ink cartridge molding die 200
FIG. 2 shows an ink cartridge 100 having five ink chambers shown in FIG.
A similar ink cartridge is formed in an upside down state with the bottom surface 110 facing up in that there is no 8.

[0006] Cores 251 to 255, which are unit members provided corresponding to the five ink chambers, are fitted into the upper die 220, and these cores are fixed to the lower die 230 by screws 281 to 285, respectively. Attached.

The upper die 220 and the five cores 251 to 255
Between the ink cartridge 100 and the bottom 110
Bottom filling part 2 which is a cavity for molding (see FIG. 2)
17a to 217e and a pair of opposing first side walls 12
0 (see FIG. 2), the first side wall filling portions 211 and 216, which are cavities for molding, and partitions 141 to 144.
Partition filling portions 212 to 215, which are cavities for molding (see FIG. 2), respectively, are formed.

[0008] These filling portions are filled with molten resin from one spool 240 provided on the upper die 220 through one gate 241.
0 is molded.

As described above, when the molten resin is filled through only one gate 241, the molten resin from the gate 241 is discharged through the bottom filling portion 217c.
Is filled more than the other partition filling units 211, 212, 215 and 216. When the filling of these partition filling portions 213 and 214 is completed, a large amount of the molten resin is filled into the adjacent partition filling portions 212 and 215, and finally, the first portion which is the filling portion at both ends is filled. The sidewall filling portions 211 and 216 are filled.

[0010]

In such a filling process, in the initial state where a large amount of the molten resin is filled in the partition filling portions 213 and 214 unbalanced, the core 25 is not filled.
2 is pressed to the left by the pressure of the molten resin filled in the partition filling unit 213, and the core 254 is pressed to the right by the pressure of the molten resin filled in the partition filling unit 214. You. In addition, the partition filling units 212 and 21
In a state where the molten resin is unbalancedly filled at 3, 214 and 215, the core 251 is pressed leftward by the pressure of the molten resin filled into the partition filling portion 212 (and 213), and the core 255 is pressed. Is the partition filling unit 215
(And 214) due to the pressure of the molten resin
Pressed to the right.

Since the molten resin is filled at a pressure of, for example, 2 ton / cm ² , the core pressed leftward or rightward may be inclined or bent by the pressing force. In order to prevent such inclination or bending, it is conceivable to make the screws 281 to 285 for fixing the cores 251 to 255 large and strong, respectively. However, since the size of the core is limited to the same size as the ink chamber, the size of the screw for fixing the core and the strength of screwing are limited, and if the core is firmly fixed, the core will be pushed. It may be broken by pressure.

Further, when the ink cartridge is molded with the core bent or inclined, the ink cartridge is formed.
Since the partition of the cartridge is also formed in a bent or inclined state, the ink cartridge may not be formed according to the mold.

Further, when the formed ink cartridge is removed from the mold after the molding, the partition of the ink cartridge may be pinched by the restoring force of the bent or inclined core, which may make it difficult to remove the ink cartridge.
In addition, since the partition is formed to be bent or inclined with respect to the direction in which the partition is taken out, this may also make it difficult to take out the partition.

The present invention has been made in view of such a situation, and an object of the present invention is to prevent the ink cartridge molding die from being bent, inclined, and damaged by the pressing force of the molten resin.

[0015]

According to a first aspect of the present invention, there is provided an ink cartridge molding die according to the first aspect of the present invention, comprising: a rectangular bottom surface; and a pair of opposed surfaces rising from an end of the bottom surface. A plurality of spaces arranged in parallel with the first side wall and the pair of opposed second side walls, and the first side wall, and surrounded by the bottom surface, the first side wall, and the second side wall; A first mold for molding an outer surface of the ink cartridge, the mold being formed by filling a filler with a plurality of partitions for partitioning the ink chamber into a plurality of partitions; A plurality of unit members corresponding to the ink chambers of
A second mold for molding the inner surface of the cartridge;
Between the first mold and the second mold, a bottom filling portion which is a cavity for molding the bottom surface, and a pair of first side wall filling portions which are cavities for molding the pair of first side walls. And a pair of second side wall filling portions, which are cavities for forming the pair of second side walls, and a plurality of partition filling portions, which are cavities for forming the plurality of partitions. In the ink cartridge molding die, a plurality of gates for filling a filler material are provided, and the plurality of gates substantially uniformly fill the first sidewall filling portion and the plurality of partition filling portions. It is configured to be filled.

According to the present invention, a plurality of gates for filling a filler are provided, and the plurality of gates are formed of a filler between the first side wall filling portion and the plurality of partition filling portions. Since the second type unit members sandwiched between these filling portions receive substantially uniform pressing force from both of the filling portions sandwiching them, since they are configured to be substantially equally filled in each of them. Become. As a result, the two pressing forces cancel each other, so that there is no possibility that the unit member of the second mold is inclined or bent due to the pressing force, and there is no possibility that the unit member is broken.

In addition, the ink cartridge is not formed in a state where the partition of the ink cartridge is bent or inclined, and an accurate ink cartridge can be formed according to a mold. Further, since the partition of the formed ink cartridge is not subjected to the restoring force by the bent unit member or the inclined unit member, the ink cartridge can be easily removed from the mold after the formation.

The use of a plurality of gates increases the amount of filler to be filled, so that filling can be performed at high speed and the filling pressure of the filler in each gate can be reduced. Furthermore, when the capacity of the filling portion filled by each gate is different, the filling amount of each gate can be individually adjusted, so that each filling portion can be almost uniformly filled with the filler.

The ink according to the invention described in claim 2 of the present application
2. The cartridge molding die according to claim 1, wherein the bottom filling portion is horizontally arranged on an upper portion and the first side wall so that the ink cartridge is formed upside down with the bottom surface facing upward. A filling unit, the second side wall filling unit, and the plurality of partition filling units are arranged downward from the bottom filling unit, and the number of the ink chambers is three.
In one case, the plurality of gates are located above the bottom filling portion and at substantially the same distance from each of the pair of first side wall filling portions and the partition filling portion adjacent thereto. In the case where the number of the ink chambers is an odd number of 5 or more, the plurality of gates are located above the bottom surface filling portion and the pair of first ink chambers are arranged at a pair of first central portions.
And a second central portion above the bottom filling portion and at a position substantially equidistant from the two adjacent partition filling portions. It is characterized by being arranged at every other second central part.

According to the invention described in this claim, the ink
A bottom filling portion is horizontally arranged on the top so that the cartridge is formed upside down with the bottom surface up, and a first side wall filling portion, a second side wall filling portion, and a plurality of partition filling portions. Are disposed downward from the bottom filling portion, and a plurality of gates are disposed above the bottom filling portion. Therefore, the filler filled from the gate is filled by gravity into the first side wall filling part, the second side wall filling part, and the plurality of partition filling parts via the bottom part filling part.

When the number of ink chambers is three,
A plurality of gates are disposed above the bottom filling portion and at a pair of first central portions substantially equidistant from each of the pair of first side wall filling portions and the partition filling portion adjacent thereto. Have been. When the number of ink chambers is an odd number of 5 or more, a plurality of gates are provided above the bottom filling portion and
A first central portion, which is disposed at the pair of first central portions and is located above the bottom portion filling portion and substantially equidistant from the two adjacent partition filling portions, has a first central portion. The second central portion is disposed every other portion from the central portion.

Therefore, the filler from the gate located at the first central portion is almost uniformly filled into the first sidewall filling portion near the gate and the partition filling portion adjacent to the first sidewall filling portion. The filler from the gate located in the center is
The two partition filling portions immediately adjacent to the gate are almost uniformly filled.

Further, a gate disposed at one first central portion or a gate disposed at one second central portion is provided with a filler to one first side wall filling portion or one partition filling portion. Will be filled.

Thus, the filling of the filler into each of the first side wall filling portion and the plurality of partition filling portions can be made substantially uniform, and the same operation and effect as the above-described invention of claim 1 of the present application can be obtained. Can be achieved.

It should be noted that the number of gates arranged in one first central portion or one second central portion may be one, or two or more.

The ink according to the invention described in claim 3 of the present application
The cartridge molding die according to claim 2, wherein one gate is disposed at each of the first central portion and the second central portion where the gate is to be disposed, and
It is arranged at a position substantially equidistant from the pair of second side wall filling portions.

According to the present invention, since one gate is disposed at each of the first central portion and the second central portion, the gates at the first central portion and the second central portion are provided. The structure of the mold can be simplified as compared with the case where a plurality of gates are provided for each. Further, since the gate is disposed at a position substantially equidistant from the pair of second side wall filling portions, the pair of second side wall filling portions can be filled with the filler substantially evenly.

The ink according to the invention described in claim 4 of the present application
The cartridge molding die is any one of claims 1 to 3.
In the above paragraph, the second mold is formed by joining unit members corresponding to the respective ink chambers by the number of the ink chambers, wherein the unit members are separated from the adjacent unit members by the partition. It is characterized by comprising an ink chamber forming portion that is joined by forming a gap that forms a filling portion, and a base portion that is joined by forming a gas vent passage between adjacent unit members.

According to the present invention, the second mold is formed by joining the unit members corresponding to each ink chamber by the number of ink chambers, so that the number of ink chambers can be reduced and increased. On the other hand, it is possible to cope by reducing and increasing the number of unit members. Therefore, it is possible to easily cope with ink cartridges having various numbers of ink chambers only by increasing or decreasing the number of unit members.

Further, since the gas vent passage is formed in the base portion and joined, the filling of the partition filling portion with the filling material is performed.
The air in the filling portion can be smoothly discharged, and bubbles can be prevented from being generated in the formed ink cartridge.

The ink according to the invention of claim 5 of the present application
The cartridge is disposed in parallel with the rectangular bottom surface, a pair of opposed first side walls and a pair of opposed second side walls rising from an end of the bottom surface, and the first side wall. A plurality of partitions for partitioning a space surrounded by the first side wall and the second side wall into a plurality of ink chambers, a bottom filling portion serving as a cavity for molding the bottom surface, and the pair of first side walls; A pair of first side wall filling portions that are cavities for molding the pair, a pair of second side wall filling portions that are cavities for forming the pair of second side walls, and a plurality of cavities that form the plurality of partitions. In an ink cartridge formed by filling a filling material into an ink cartridge molding die having a partition filling portion formed therein, the filling material comprises the first side wall filling portion and the plurality of plural filling portions. The position of the surface corresponding to the position for substantially uniformly filling the respective cut filler section has the shape traces a plurality of gates for filling the filling material, characterized in that.

Generally, a plurality of gate marks are left on the surface of the ink cartridge formed by the ink cartridge forming die according to the first aspect of the present invention. The ink cartridge according to the invention described in this claim has such a plurality of gate shape traces.

The ink according to the invention described in claim 6 of the present application
6. The cartridge according to claim 5, wherein, when the number of the ink chambers is three, the shape traces of the plurality of gates are the bottom surface and the pair of first side walls and each of the pair of first side walls. When the number of the ink chambers is an odd number of 5 or more, the ink cartridge is left at a pair of third central portions that are equidistant from the partition. And at a fourth central portion on the bottom surface and equidistant from the two adjacent partitions, a fourth central portion from the third central portion is provided at every other central portion. Has been characterized.

Similarly to the ink cartridge according to the fifth aspect of the present invention, the ink cartridge according to the second aspect of the present invention is an ink cartridge for forming an ink cartridge according to the second aspect of the present invention. The mold has traces of gate shapes at positions corresponding to the positions of the plurality of gates of the mold.

The ink according to the invention of claim 7 of the present application
7. The cartridge according to claim 6, wherein each of the third central portion and the fourth central portion has only one shape trace of the gate, and is substantially equal from the pair of second side walls. Characterized by being left at a distance.

Similarly to the ink cartridge according to the fifth and sixth aspects of the present invention, the ink cartridge according to the third aspect of the present invention is the same as the ink cartridge according to the third aspect of the present invention. The mold has traces of gate shapes at positions corresponding to the positions of the plurality of gates of the molding die.

The ink according to the invention described in claim 8 of the present application
The method of manufacturing a cartridge includes a rectangular bottom surface, a pair of opposed first side walls and a pair of opposed second side walls rising from an end of the bottom surface, and a plurality of the side walls arranged in parallel with the first side wall. And a plurality of partitions for partitioning a space surrounded by the first side wall and the second side wall into a plurality of ink chambers.
Combining a first mold for molding the outer surface of the cartridge and a second mold having a plurality of unit members corresponding to the plurality of ink chambers and for molding the inner surface of the ink cartridge, A bottom filling portion, which is a cavity for molding the bottom surface, and a pair of first cavities, which are cavities for molding the pair of first side walls, between the first mold and the second mold.
, A pair of second side wall filling portions that are cavities for forming the pair of second side walls, and a plurality of partition filling portions that are cavities for forming the plurality of partitions. A plurality of gates configured to substantially uniformly fill the first side wall filling section and the plurality of partition filling sections are simultaneously filled with the filler, and the filled filler is cooled and solidified. The cooling solidified filler is removed from the first mold and the second mold.

According to the present invention, a plurality of gates configured to substantially uniformly fill the first side wall filling portion and the plurality of partition filling portions with the filler respectively are provided.
Since the filler is filled at the same time,
The same operation and effect as the invention described in (1) can be obtained.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Structure of Ink Cartridge and Mold for Forming Ink Cartridge] FIG. 1 is a sectional view of a main part of a mold for forming an ink cartridge according to the present invention. This ink cartridge molding die 1 is configured as a die used in an injection molding machine (not shown).

FIG. 2 is a perspective view of an ink cartridge molded by the ink cartridge molding die 1, FIG. 2 (a) is a perspective view from the bottom side having an ink supply port, and FIG. Is a perspective view from the top side.

Referring to FIG. 2, this ink cartridge 100 has a bottom surface 110 and a pair of opposing first side surfaces 12 rising substantially vertically from the end of the bottom surface 110.
0, 120 and a pair of opposing second side surfaces 130, 1
30 and four partitions 141, 142, 143 and 1 arranged in parallel with the first side surfaces 120, 120.
44 are integrally formed.

The partitions 141 to 144 partition the ink cartridge 100 into five ink chambers 151 to 155 having substantially the same volume. Bottom 1
In 10, the ink in each ink chamber is externally provided (recording head, etc.).
In order to supply ink to the ink chambers, five ink supply ports 111 to 115 are formed corresponding to the respective ink chambers. The bottom surface 110 has circular concave portions 116 and 117 which are slightly concave.
And 118 are formed. These recesses (gate marks) 116, 117 and 118 are traces of the respective gates 41a, 42a and 43a (see FIG. 1) described later.

Next, referring to FIG. 1, an ink cartridge molding die 1 includes an upper die (first die) 2, a lower die 3,
It has three spools 41, 42 and 43 for filling a molten resin (for example, polypropylene) as a filler, and five cores (second molds) 51 to 55 as unit members.

The upper mold 2 has an ink cartridge 100
The outer surface of the bottom surface 110 (see FIG. 2), the outer surfaces of the pair of first side walls 120, 120, and the pair of second side walls 130, 1
A concave portion 21 for forming the outer surface of the recess 30 is formed.
FIG. 1 is a cross-sectional view taken along a plane perpendicular to a portion where the outer surfaces of the pair of first side walls 120, 120 are formed. FIG. 1 shows the outer surfaces of the pair of second side walls 130, 130. Are not shown.

The cores 51 to 55 are respectively composed of base portions 51a to 55a on the lower mold 3 side and ink chamber forming portions 51b to 55b on the upper mold 2 side and fitted in the recessed portions 21. I have. The bases 51a to 55a are fixedly attached to the lower mold 3 by fixing screws 81 to 85, respectively. The ink chamber forming parts 51b to 55b are:
It has a shape corresponding to each of the five ink chambers 151 to 155 of the ink cartridge 100 (see FIG. 2),
The inner surface of the bottom surface 110, the inner surfaces of the first side walls 120, 120, and the inner surfaces of the second side walls 130, 130 are formed, and the partitions 141 to 144 are formed.

Between the ink chamber forming portions 51b to 55b and the concave portion 21, there are provided bottom filling portions 17a to 17e which are cavities for forming the bottom surface 110 and a pair of cavities for forming a pair of second side walls. A second side wall filling portion (not shown) is formed. In addition, the ink chamber forming section 51
b and the recessed portion 21 and between the ink chamber forming portion 55b and the recessed portion 21, a pair of first side walls 120, 120 are provided.
The first side wall filling portions 11 and 16, which are cavities for forming the first side wall, are formed.

Each base 51 of the cores 51, 53 and 55
a, 53a and 55a and the respective ink chamber forming portions 51b and 5a.
3b and 55b have the same width (the width in the left-right direction in FIG. 1; the same applies hereinafter). On the other hand, the width of each of the bases 52a and 54a of the cores 52 and 54 is formed to be larger than the width of each of the ink chamber forming parts 52b and 54b, and between each of the bases 52a and 54a and each of the ink chamber forming parts 52b and 54b. , A step is formed at both ends. Thereby, the partitions 141 to 144 are provided between the ink chamber forming portions 51b to 55b.
Partition filling portions 12 to 15 which are cavities for molding (see FIG. 2) are formed.

All these filling parts are in communication with one another. Further, each of the first side wall filling portions 11 and 16 and each of the partition filling portions 12 to 15 have substantially the same volume.

As described above, the ink cartridge molding die 1 is provided with the ink cartridge 100 (see FIG. 2).
Is formed in an upright state with its bottom surface 110 as an upper part.

Between the side surfaces of the bases 51a to 55a and the lower mold 3, and between the bases 51a to 55a, a small gap 9 through which air can pass but molten resin cannot enter.
1 to 96 are formed. As a result, as the molten resin fills the filling portions 11 to 16, 17a to 17e and the pair of second side wall filling portions (not shown),
The air in these filling portions is discharged to the outside of the ink cartridge molding die 1 through the gaps 91 to 96. Accordingly, the molten resin is smoothly filled into these filling portions, and no bubbles are generated in the ink cartridge 100 as a molded product.

The three spools 41, 42 and 43
It is provided on the upper part of the concave part 21 and fills the filling part with the molten resin from above. These spools 41, 42 and 43
Are supplied with heat to the molten resin therein to maintain the resin in a molten state.
And 43b are attached respectively. Further, gates 41a, 4 which are end portions for filling the filling portion with the molten resin are provided at the lower ends of the spools 41, 42, and 43, respectively.
2a and 43a are provided respectively.

The gate 41a is provided above the bottom filling portion 17a at a position substantially equidistant from the first side wall filling portion 11 and the partition filling portion 12. Gate 42a
Is located above the bottom filling portion 17c.
It is provided at a position substantially equidistant from 3 and 14. The gate 43a is provided at a position substantially equidistant from the partition filling part 15 and the first side wall filling part 16 in the bottom filling part 17e.

As described above, the gate is located at substantially the same distance from the two first side wall filling portions 11 and 16 and the partition filling portions 12 and 15 adjacent thereto (hereinafter, referred to as “first central portion”). ), And at positions approximately equidistant from the two adjacent partition filling portions 12 and 13, at positions approximately equidistant from 13 and 14, and 14
Positions approximately equidistant from the second and the fifth (hereinafter referred to as “second central portion”).
That. ) Are provided at every other second central part from the first central part.

The gates 41a, 42a and 43a are arranged at substantially the same distance from a pair of second side wall filling portions (not shown). The recesses 116, 117 and 118 of the ink cartridge 100 correspond to the shape traces of the gates 41a, 42a and 43a, respectively.

At a position around the bases 51a to 55a and in contact with the upper mold 2, a pushing member 6 for cutting is mounted movably toward the upper mold 2. Extrusion rods 71 and 72 are attached to the lower portion of the extrusion member 6. When the upper mold 2 is removed after the ink cartridge is formed, the push rods 71 and 72 are removed.
As a result, the extruding member 6 is extruded upward,
Accordingly, the formed ink cartridge 100
(FIG. 2) is also extruded. Thus, the ink cartridge 100 is removed from the core.

[Manufacturing Process of Ink Cartridge] Next, a manufacturing process of the ink cartridge 100 using the ink cartridge molding die 1 will be described.

The upper die 2 and the lower die 3 to which the cores 51 to 55 are attached are combined, and the bottom die filling portions 17a to 1
7e, first sidewall filling portions 11 and 16, partition filling portions 12 to 14, and a pair of second sidewall filling portions (not shown) are formed.

Subsequently, the filling of the molten resin is simultaneously started from the gates 41a, 42a and 43a by the spools 41, 42 and 43, and the same amount of the molten resin is filled from each gate per unit time.

The center spool 42 also receives heat from the left and right spools 41 and 43, while the left and right spools 41 and 43 dissipate heat to the left and right, respectively. Therefore, spools 41, 42 and 43 are connected to band heaters 41b, 42b.
And 43b, the temperature of the center spool 42 tends to be higher than the temperatures of the left and right spools 41 and 43. Therefore, the spool 42
The viscosity of the molten resin in the spools 41 and 43 becomes lower than the viscosity of the molten resin in the spools 41 and 43. Therefore, the gate 41
The diameters of a and 43a are made larger than the diameter of the spool 42a, and are adjusted so that the filling amount from each gate per unit time is the same.

Since the gate 41a is disposed at a position substantially equidistant from the first side wall filling section 11 and the partition filling section 12 at both ends thereof, the molten resin filled from the gate 41a is filled with the bottom filling section 17a. , The first side wall filling portion 11 and the partition filling portion 12 at both ends thereof are almost equally divided and filled. Since the gate 42a is disposed at a position substantially equidistant from the partition filling portions 13 and 14 at both ends thereof, the molten resin filled from the gate 42a passes through the bottom filling portion 17c and passes through the partition at both ends. The filling portions 13 and 14 are almost uniformly split and filled. The gate 43a is connected to the partition filling portions 1 at both ends.
5 and the first side wall filling portion 16, the molten resin to be filled from the gate 43 a passes through the bottom filling portion 17 e and passes through the partition filling portions 15 at both ends thereof. The first side wall filling portion 16 is almost uniformly divided and filled.

The amount of the molten resin charged per unit time from the gates 41a, 42a and 43a is the same.
Since each of the first side wall filling portions 11 and 16 and each of the partition filling portions 12 to 15 have the same volume, the molten resin is almost uniformly filled in each of these filling portions.

As a result, the pressing forces from the molten resin applied to both ends of each core cancel each other, so that each core does not tilt, bend or break. Also, the molded ink cartridge can be as accurate as the mold.

Further, since these gates 41a, 42a and 43a are located at substantially the same distance from a pair of second side wall filling portions (not shown), a pair of second
The molten resin can be almost evenly filled also in the side wall filling portion.

When the filling is completed, the spools 41 to 43
Is stopped, and then the filled molten resin is cooled and solidified. After cooling and solidification, the upper mold 2 is removed. After that, the extrusion members 6 are extruded upward by the extrusion rods 71 and 72, and the formed ink cartridge 100 is taken out.

[Other Embodiments] In the above-described embodiment, one gate is provided at each of the first central portion and the second central portion where the gate is to be disposed. A plurality of gates can be provided at the center.
In addition, the number of gates provided at each central part may be different, and in this case, the molten resin is almost evenly applied to each filled part by making the filling amount filled from each central part every short time the same. Can be filled. Further, although one spool is provided for each gate, a configuration in which molten resin is supplied to each gate from one spool may be adopted.

In the above-described embodiment, the gate 4
Even if the filling portions 1a, 42a and 43a are in charge of filling, respectively, have the same volume, even if the volumes are different, the filling amount of each gate can be individually adjusted (for example, by adjusting the aperture of the gate) to obtain each of the filling portions. The filling portion can be almost uniformly filled with the molten resin.

Further, in the above-described embodiment, the case where the ink chamber has five ink cartridges has been described.
There are three ink chambers (for example, ink chambers 151 and 1 in FIG. 2).
In the case of the ink cartridges of 52 and 153), the corresponding cores are the cores 51, 52 and 53 of FIG.
And the partition filling part 14 becomes the first side wall filling part. Further, there are two gates 41 and 42, and these gates 41 and 42 are arranged at the two first central portions.

When the number of ink chambers is even, the gates are arranged at the positions shown in FIG. 3A or 3B so that the filling of the molten resin into each filling portion is made substantially uniform. Can be. That is, in FIG.
Are located at the first central portion, the gate 502 is located at the second central portion, and the gate 503 is located right above the first sidewall filling portion. In (b), the gate 50
4 and 506 are both disposed at the first central portion, and the gate 505 is disposed immediately above the partition filling portion. In this case, the filling amount of the molten resin per unit time from the gate disposed directly above the first side wall filling or directly above the partition filling portion is approximately one half of that from the other gates. By doing so, the molten resin can be almost uniformly filled in each filling portion.

Regardless of whether the number of the ink chambers is even or odd, the gates 511 to 516 are located just above the first side wall filling portions and immediately above the partition filling portions as shown in FIG. By arranging them one by one, it is possible to fill the filling portions almost uniformly.

[0070]

According to the present invention, the unit member (core) of the second type sandwiched between the first side wall filling portion or the partition filling portion.
Will receive a substantially uniform pressing force from both of the filling portions sandwiching itself. As a result, the two pressing forces cancel each other, so that the unit member of the second type is inclined by the pressing force,
There is no risk of bending or breaking.

Further, it is possible to form an accurate ink cartridge according to the mold without forming the ink cartridge in a bent or inclined partition. Further, since the partition of the formed ink cartridge is not subjected to the restoring force by the bent unit member or the inclined unit member, the ink cartridge can be easily removed from the mold after the formation.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an ink cartridge molding die according to the present invention.

FIG. 2 is a perspective view of an ink cartridge formed by the ink cartridge forming die according to the present invention.

FIG. 3 shows an arrangement of gates when the number of ink chambers is even.

FIG. 4 shows one gate disposed immediately above the first side wall filling part and one gate immediately above the partition filling part.

FIG. 5 is a sectional view of a main part of a conventional ink cartridge molding die.

DESCRIPTION OF SYMBOLS 1 Ink cartridge molding die 2 Upper die 3 Lower die 41a, 42a, 43a Gate 17a, 17b, 17c, 17d, 17e Bottom filling part 11, 16 First sidewall filling part 12, 13, 14 , 15 Partition filling part 51, 52, 53, 54, 55 Core 51a, 52a, 53a, 54a, 55a Base 51b, 52b, 53b, 54b, 55b Ink chamber forming part 100 Ink cartridge 110 Bottom surface 120 First side wall 130 Second side wall 141, 142, 143, 144 Partition 151, 152, 153, 154, 155 Ink chamber

Claims (8)

[Claims] 1. A rectangular bottom surface, a pair of opposing first side walls and a pair of opposing second side walls rising from an end of the bottom surface, and arranged in parallel with the first side wall. And a plurality of partitions for partitioning a space surrounded by the first side wall and the second side wall into a plurality of ink chambers by filling a filler with a filler. A first mold for molding the outer surface of the ink cartridge, and a second mold having a plurality of unit members corresponding to the plurality of ink chambers and molding the inner surface of the ink cartridge. A bottom filling portion serving as a cavity for molding the bottom surface, and a pair of first side walls serving as cavities for molding the pair of first side walls between the first mold and the second mold; A filling portion, and the pair of second In such an ink cartridge molding die, a pair of second side wall filling portions which are cavities for forming side walls and a plurality of partition filling portions which are cavities for forming the plurality of partitions are formed. A plurality of gates for filling the filling material are provided, and the plurality of gates are configured such that the filling material is substantially uniformly filled in each of the first side wall filling portion and the plurality of partition filling portions. A mold for forming an ink cartridge. 2. The filling device according to claim 1, wherein the bottom filling portion is horizontally arranged on the upper portion so that the ink cartridge is formed upside down with the bottom surface facing upward, and the first side wall filling portion is formed. And the second side wall filling section and the plurality of partition filling sections are arranged downward from the bottom filling section, and when the number of the ink chambers is three, the plurality of gates are provided. , Above the bottom filling portion and at a pair of first central portions substantially equidistant from each of the pair of first side wall filling portions and the partition filling portion adjacent thereto. When the number of the ink chambers is an odd number of 5 or more, the plurality of gates are arranged above the bottom filling portion and in the pair of first central portions, and At the top of the part and two adjacent An ink cartridge characterized by being disposed at a second central portion at a position substantially equidistant from the partition filling portion, at every other second central portion from the first central portion. Mold for molding. 3. The device according to claim 2, wherein one gate is disposed at each of the first central portion and the second central portion where the gate is to be disposed, and the pair of second central portions is disposed at the first central portion and the second central portion. A mold for forming an ink cartridge, wherein the mold is arranged at a position substantially equidistant from a side wall filling portion. 4. The ink jet printer according to claim 1, wherein the second mold is formed by joining unit members corresponding to the respective ink chambers by the number of ink chambers. An ink chamber forming portion in which a unit member is joined by forming a gap forming the partition filling portion between adjacent unit members, and a degassing passage formed between the adjacent unit members and joined. A mold for forming an ink cartridge, comprising: 5. A rectangular bottom surface, a pair of opposing first side walls and a pair of opposing second side walls rising from an end of the bottom surface, and arranged in parallel with the first side wall. And a plurality of partitions for partitioning a space surrounded by the first side wall and the second side wall into a plurality of ink chambers, and a bottom filling portion which is a cavity for molding the bottom, and the pair of first and second first chambers. A pair of first side wall filling portions which are cavities for forming the side walls, a pair of second side wall filling portions which are cavities for forming the pair of second side walls, and a cavity for forming the plurality of partitions. In an ink cartridge formed by filling a filler into an ink cartridge molding die having a plurality of partition filling portions formed therein, the filler is filled with the first side wall filling portion and the plurality of partitions. An ink cartridge, characterized in that the ink cartridge has a shape trace of a plurality of gates for filling the filler at a position on the surface corresponding to a position for substantially uniformly filling each of the filling portions. 6. The shape trace of the plurality of gates according to claim 5, wherein when the number of the ink chambers is three, the shape trace of the plurality of gates is on the bottom surface and adjacent to each of the pair of first side walls. When the number of the ink chambers is an odd number of 5 or more, it is left at the pair of third central portions that are located at substantially equal distances from the above-mentioned partition, and at the bottom surface, the third pair of the third And at the bottom of the
An ink characterized in that at a fourth central portion which is located at substantially the same distance from two adjacent partitions, the fourth central portion is provided at every other fourth central portion from the third central portion.・
cartridge. 7. The gate according to claim 6, wherein each of the third central portion and the fourth central portion has only one shape trace of the gate, and the gate has a trace from the pair of second side walls. An ink cartridge, which is left at substantially equal distances. 8. A rectangular bottom surface, a pair of opposed first side walls and a pair of opposed second side walls rising from an end of the bottom surface, and arranged in parallel with the first side wall. And a plurality of partitions for partitioning a space surrounded by the first side wall and the second side wall into a plurality of ink chambers. Combining a first mold for molding the outer surface of the cartridge and a second mold having a plurality of unit members corresponding to the plurality of ink chambers and for molding the inner surface of the ink cartridge, A bottom filling portion that is a cavity for molding the bottom surface, a pair of first side wall filling portions that are cavities for molding the pair of first side walls, between the first mold and the second mold; A pair of Forming a pair of second side wall filling portions that are cavities for forming the two side walls, and a plurality of partition filling portions that are cavities for forming the plurality of partitions;
A plurality of gates configured to substantially uniformly fill the first side wall filling portion and the plurality of partition filling portions with the filling material are simultaneously filled with the filling material, and the filled filling material is cooled. A method for manufacturing an ink cartridge, comprising solidifying and removing the cooled solidified filler from the first mold and the second mold.