JP2001030677A - Ink reservoir and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink reservoir which can be manufactured to the designed shape without fear that a mold for forming a groove might fall by injection pressure, even when an ink reserving groove and an ink flow groove are narrow as well as a method for manufacturing such an ink reservoir. SOLUTION: A resin material is injection-molded in such away that a plurality of disc-shaped sheet elements 12 are laminated spaced from each other, the space between the elements 12 serving as an ink reserving groove 14. The ink reserving grooves 14 are made to communicate with each other at least by a single ink flow groove (a communicating groove) 16 as an ink reservoir 10. The ink reservoir 10 is molded at least, in a split state, bordering on a binding face (a split face) 18 in the same direction as the ink flow groove 16. The ink reservoir 10 is thus obtained by fitting and binding the binding faces 18 of the split halves 20 of the ink reservoir 10 together. The ink flow groove 16 comprises a recessed part positioned on the binding face 18 of one of the split halves 20 of the ink reservoir 10 and the plain face of the binding face 18 of the other half 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for temporarily storing ink which is used for, for example, a writing instrument, an applicator, specifically, a direct liquid writing instrument or a direct liquid ink jet cartridge. The present invention relates to an ink reservoir having leaves and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a writing implement of a type in which ink stored directly in an ink tank (referred to as "raw ink" with respect to ink absorbed in a batting or the like) is directly supplied to a writing body (or a coated body). As a utility model registration No. 254
No. 4573, Japanese Utility Model Publication No. 1-1236, and
No. 2,238,186. These raw ink type writing implements temporarily absorb ink and reduce pressure changes in the ink tank caused by human hands holding the writing implement (changes in the internal pressure of the ink tank due to temperature changes, etc.). An ink reservoir (also called a reservoir, a bellows, or a collector) for retaining ink is indispensable.

However, as shown in the prior art such as the above-mentioned publication, the ink reservoir used in these raw ink type writing instruments has an extremely fine gap (ink circulation groove (normally 0.1 mm) or ink reservoir groove). (Usually 0.
2 to 1.0 mm)), and the gaps (ink storage grooves or ink circulation grooves) must be strictly controlled in shape and dimensions, and their production is extremely difficult. .

[0004] In particular, the ink circulation grooves communicating with the respective ink storage grooves are important parts that influence the ink holding ability of the ink reservoir, and the quality of the ink circulation grooves is, in turn, a raw ink type writing implement. In the above, the performance was influenced. Therefore, if the position, size, and shape of the ink storage groove are different from those designed, the temporary storage of ink in the ink storage groove will not be performed satisfactorily, and the internal pressure of the ink tank will be increased. Alternatively, the writing instrument may remain in a reduced state, and there is a possibility that the writing implement may have adverse effects such as inability to discharge ink from the tip of the writing section or the air replacement hole or to apply ink from the tip of the writing section.

[0005] The function of the ink reservoir is due to the function of the surface tension caused by the ink reservoir groove (lateral groove) together with the ink circulation groove (vertical groove). In the case of ink jet cartridges that usually require a large amount of ink,
The amount of ink used to reduce the amount of ink used increases the amount of air that can be moved to return the pressure inside the ink tank to the same pressure due to temperature changes, and the capacity (area) of the ink storage groove increases. I needed to.

[0006]

However, in these molding dies for forming the ink circulation grooves or the ink retaining grooves, the dies for molding the grooves are extremely thin (0 mm) corresponding to the width of the grooves. .2 mm to 0.4 mm)
In order to increase the required capacity of the ink reservoir, it is necessary to increase the area of the extremely thin mold. In "injection molding" which is usually used in the field of writing instruments, the injection pressure is extremely large. Problems such as falling down of a thin mold occurred, and it was difficult to manufacture a shape as designed. This problem is particularly serious in an extremely thin mold for forming an ink circulation groove which is thinner than the ink storage groove and has a large area even as one groove. In addition, poor molding of the ink circulation groove, which is usually provided only at one place, is a problem that affects the performance of the writing implement. In addition, as described above, the ink circulation holes (ink introduction grooves) of the conventional ink reservoir are manufactured by using a mold on a thin plate to form a space for a fine molded product. In addition, there has been a problem in that the surface treatment is generally performed to improve the ink wettability of the ink introduction groove. This stable management of wettability has technical difficulties and has been an obstacle to cost reduction. Although the inventor has devised that the ink reservoir has a divided structure, a technique for stably managing the size of a minute space such as an ink circulation hole is desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and causes a problem that the groove forming die falls down due to the injection pressure even if the width of the ink storing groove or the ink flowing groove is small. It is an object of the present invention to provide an ink reservoir and a method for producing the same, which can produce a shape as designed without the need. In addition, it is difficult to process the mold, and there is a problem with the durability of the mold. The purpose is to provide the body.

[0008]

The present invention has the following arrangement to achieve the above object. In the first invention, a plurality of board-shaped sheet bodies are resin-molded in a laminated state with a gap, the gap between the sheet bodies is an ink storage groove, and the ink storage grooves are at least one continuous groove. An ink reservoir communicating with a passage, wherein the ink reservoir is formed in a state where the ink reservoir is divided into at least two parts by a boundary surface along the axial direction, and the coupling surfaces of the divided ink reservoirs are connected to each other. Wherein at least one of the divided ink reservoirs has a communication path formed on the coupling surface side to connect the retaining groove between the sheet-like members. It is a reservoir. In the present invention, a concave portion is formed on at least one of the coupling surfaces facing each other of the ink reservoir in a divided state, and when the divided surfaces are joined together, the concave portion and the other divided surface are used to form the concave portion. It is preferable to form a communication passage. In the present invention, it is preferable that an ink occluding body is interposed in the communication path. In the second invention, a plurality of board-shaped sheet bodies are resin-molded in a laminated state with a gap around a cylindrical portion through which a relay core passes, and the gap between the sheet bodies is used as an ink retaining groove. An ink reservoir body in which the ink reservoir grooves communicate with each other through at least one communication passage, wherein the ink reservoir body is formed in a state where the ink reservoir body is divided into at least two parts by a joint surface along the axial direction, In addition, the connecting surfaces of the ink reservoirs in the divided state are joined together, and the communication path connects a plurality of ink retaining grooves between the inner surface of the cylindrical portion of the ink reservoir body and the sheet. An ink reservoir having a communication hole formed therein. In the present invention, it is preferable that an ink occluding body is provided inside the cylindrical portion so as to face the ink retaining groove through the communication hole and guide the ink to the ink relay core. Further, in the present invention, it is preferable that the capillary force of the ink occluding body is set to be equal to or larger than the capillary force of the ink retaining groove between the sheets. Further, in the present invention, the ink reservoir is formed by laminating substantially disc-shaped sheet bodies so that the outer shape thereof has a substantially columnar shape, and is divided into two by a joint surface passing through the axis. Those are preferred.
In the third invention, when manufacturing the ink reservoir, a mold for forming the divided ink reservoir is arranged such that the divided ink reservoirs are arranged in parallel, In addition, the present invention provides a method of manufacturing an ink reservoir, wherein the mold portions of the respective ink reservoir grooves which are opposed to each other when combined are formed so as to be located on the same line.

In the present invention, the ink reservoir is conventionally formed of a single sheet by injection molding, but in the present invention, the ink reservoir is replaced with a connecting surface extending along the axial direction. And formed by combining at least two parts (divided in the vertical direction or the axial direction). This makes it easier to spread the resin sufficiently to each sheet when molding the resin,
Even if the size of the sheet is increased, it is possible to prevent molding defects from occurring. In addition, the communication path connecting the ink storage grooves between the sheet bodies is formed with a recess formed on one of the opposed coupling surfaces of the divided ink reservoir and the other coupling surface. And the flow passage is located on the joined surface. In the ink reservoir of the present invention formed as described above, the mold for forming the recess may be provided with a step corresponding to the recess in the joint surface mold. Therefore, since an extremely thin mold for forming the communication passage (for example, the communication groove) is not required, the extremely thin mold does not fall down even by the injection pressure of the resin at the time of injection molding. Defects can be eliminated. Further, since one extremely thin mold can be eliminated, the mold can be simplified and the manufacturing cost of the mold can be reduced.

[0010] As a desirable mode of the present invention, an ink occluding body is interposed in the communication path. Thereby, without setting the capillary force at the gap of the ink flow passage,
Since it can be set by the capillary force of the ink occluding body, a predetermined performance can be obtained without strictly pursuing the forming precision of the ink storing body, so that the forming efficiency and the production efficiency are improved. According to the second aspect of the present invention, the communication path is formed along the axial direction with a communication hole that connects a plurality of gaps between the inner peripheral portion of the cylindrical portion of the ink reservoir in the divided state and the sheet-like body. Therefore, it is not necessary to form a narrow so-called vertical groove (slit) connecting the respective sheet bodies, and the molding efficiency and the production efficiency are improved at the time of die molding, similarly to the first invention. In addition, there is a space between the inner peripheral surface of the cylindrical portion and the relay core, and in this space, an ink occluding body which faces the ink storage groove via the communication hole and is in contact with the relay core is arranged. Is preferred. In this way, the ink in the ink storage groove can be reliably guided to the relay core, and the ink can be stored and used smoothly. Further, it is desirable that the capillary force of the ink occluding body is set to be equal to or larger than the capillary force of the ink retaining groove between the sheet-like and leaf-shaped bodies. This makes it possible to reliably guide the ink in the ink retaining groove between the sheet bodies to the ink occluding body. In a desirable mode of the present invention, the ink reservoir is formed by laminating substantially disc-shaped sheet bodies so as to have a substantially cylindrical outer shape, and the coupling surface has an axis (corresponding to the diameter of the sheet body). ) So that the shape of the divided ink reservoirs can be made substantially equal, and the resin shrinks after molding ("shrinkage").
Since the shape and size change caused by the same can be made the same, the divided and formed ink reservoir can be easily formed symmetrically, so that the ink reservoir of the designed shape can be easily formed it can. Also, the mold for forming the divided ink reservoirs is arranged so that the divided ink reservoirs are arranged in parallel, and the respective ink reservoir grooves (lateral grooves) are located on the same line. By forming the ink storage grooves of the divided ink storage bodies, the ink storage grooves of the two ink storage bodies (divided) opposed to each other are formed simultaneously with one extremely thin mold for forming the ink storage grooves of the divided ink storage bodies. can do. Accordingly, when the respective ink reservoirs are combined, the ink retaining grooves of the respective ink reservoirs can be accurately aligned with each other. Therefore, the ink retaining function (the temporary storage of the ink) can be achieved. An ink reservoir having a stable function can be obtained.

In the case where the ink reservoir is divided as in the present invention, the accuracy of a molded article is improved, and further, a raw ink type writing instrument having an ink retaining function as a product, an ink jet printer, or the like. This greatly contributes to the stability of the performance of the cartridge. In addition, as a method of joining these divided and formed ink reservoirs into one, a method of providing corresponding fitting unevenness on the coupling surface of each ink reservoir and joining them together may be used. Aside from this,
In a writing implement of a barrel having a cylindrical internal shape, an ink reservoir is formed so as to have the same internal shape as the barrel, and each ink is inserted into the barrel by inserting the ink reservoir. In some cases, the holding bodies are combined for positioning. Also, at this time, a relay core hole is formed in the ink reservoir so as to sandwich the relay core, which is a constituent element of a raw ink type writing instrument, and large-diameter portions are provided at both ends of the relay core. The position in the direction can be regulated (for example, see FIG. 9). In order to mount the relay core on the conventional ink storage body which is not divided into two parts, a convex portion is provided in the relay core hole, and the concave portion of the relay core is fitted over the convex portion. In some cases, excessive force may be applied to hinder the ability to guide the ink. However, such a hindrance can be eliminated by the relay core having the above configuration.
In addition, for positioning in the axial direction (longitudinal direction), a groove or the like is provided so that the ink reservoir can be engaged with the ink reservoir insertion portion of the barrel, and the position in the axial direction may be regulated. .

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 are explanatory diagrams of an ink reservoir according to the first embodiment, and FIG. 6 is an explanatory diagram of a writing instrument using the ink reservoir. This ink reservoir is applied to a direct liquid type (raw ink type) writing instrument, but can also be used for an ink reservoir of an ink jet printer head.

As shown in FIGS. 1 and 2, the ink reservoir 10 in the direct liquid type writing instrument according to the first embodiment has a plurality of disc-shaped portions around a cylindrical portion 8 through which a relay core 32 passes. Injection molding a resin material in a laminated state with a gap,
An ink reservoir in which the gap between the sheet bodies 12 is an ink reservoir groove 14 and the ink reservoir grooves 14 communicate with each other through at least one ink circulation groove (communication groove) 16. The ink reservoir 10 is formed in a state where the ink reservoir 10 is divided into at least two parts by a coupling surface (division surface) 18 in the same direction as the ink circulation groove 16, and the coupling surface 1 of the ink reservoirs 20, 20 in the divided state.
8, 18 are joined together. The ink flow grooves 16 are provided in the divided ink reservoirs 20, 20.
One of these is formed when the recess located on the coupling surface 18 of one of them is combined with the flat coupling surface 18 of the other. The ink reservoir 10 is formed by laminating substantially disc-shaped sheet bodies 12 so that the outer shape is substantially cylindrical, and has a boundary between a coupling surface 18 passing through an axis.
It is divided. Reference numeral 46 denotes a relay core hole in which the relay core 32 is inserted or sandwiched, and reference numerals 10a denote thick portions at the front end and the rear end in consideration of the strength of the ink reservoir.

The operation of the ink reservoir 10 is generally as follows. The operation of the writing implement shown in FIG. 6 accompanying the consumption of ink by writing will be described. The ink inside the ink tank (reservoir) 30 located at the rear of the writing implement is supplied to the pen core 3 by the relay core 32 penetrating the center of the ink reservoir 10.
4 and a writing tip (ballpoint pen tip) 36 in this case. At this time, the ink is consumed and the ink tank 3
The pressure in 0 is reduced as the amount of ink decreases. The inside of the depressurized ink tank is provided with an air hole 40 provided in the writing tool tip shaft 38.
The outside air is taken in, and the taken-in outside air is replaced with an air replacement groove (or an air replacement passage) provided in the ink reservoir 10.
The ink is supplied to the ink storage groove 14 through 42 and the ink held in the ink storage groove 14 is returned into the ink tank 30 through the ink circulation groove 16.

Here, in the ink reservoir, the interval between the ink reservoir groove 14 and the ink tank 30 is smaller on the ink tip 30 side (air hole 40 side) than on the writing tip 36 side, so that the ink retaining force is set large. As a result, the ink stored in the ink storage groove 14 on the side of the writing tip portion 36 is replaced with the outside air taken in earlier, and is returned to the ink tank 30 through the ink circulation groove 16, so that it is easy. There is no discharge from the air hole 40. In addition, when the user holds the barrel 44, when the outside air temperature rises, or when the outside air pressure is reduced, the function of the ink reservoir 10 is as follows. Alternatively, air passes through the ink circulation groove 16 of the ink reservoir 10, and if it is ink, it is retained in the ink reservoir groove 14, and if it is air, it is not retained in the ink reservoir groove 14 and written through the air replacement groove 42. The air is discharged from the air hole 40 of the distal end portion 36. Again,
The ink storage groove 14 is on the writing tip 36 side (air hole 40 side).
Since the interval on the ink tank 30 side is smaller and the holding power of the ink is set larger, the ink is stored in order from the ink storage groove 14 on the ink tank 30 side and is easily discharged from the air hole 40. There is nothing.

FIGS. 2 to 5 show the ink reservoir 10 shown in FIG. 1 in a divided state (indicated by reference numerals 20 and 20). 18 and formed by being divided into two parts. Needless to say, the division of the ink reservoir 10 is not limited to two, but may be divided into three or four as appropriate according to the embodiment.

1 to 3, reference numeral 16 denotes an ink circulation groove.
Reference numeral 14 denotes an ink storage groove, and reference numeral 12 denotes a sheet. A relay core hole (through hole) 46 for inserting the relay core 32 is provided at the center of the ink reservoir 10, and the ink reservoir 1 is formed to form the air replacement groove 42 with the inner surface of the shaft cylinder.
There is an air circulation portion formed as one paragraph from the outer shape (see FIG. 3). The ink circulation grooves 16 are arranged on the coupling surface 18 and communicate the ink storage grooves 14.

Here, the ink reservoir 10 is divided vertically (axially) according to the diameter passing through the axis of the substantially cylindrical ink reservoir 10. As a result, the ink storage body 10 divided into two parts does not cause "shrinkage" of the resin at the time of molding, is easily molded into a uniform shape, and has the initially set stable performance. The body 10 can be obtained. Further, as shown in detail in FIGS. 4 and 5, the ink circulation groove 16 provided in the coupling surface 18 has a “dent” only in the coupling surface 18 of one of the divided ink reservoirs 10. It is provided and set, and the other coupling surface 18 is formed in a plane.

FIGS. 7 and 8 are schematic diagrams of a mold used for molding the ink reservoir of the present invention. FIG. 7 shows a male mold and FIG. 8 shows a female mold. This mold is arranged such that the molds of the ink reservoirs 10 in the divided state are arranged in parallel,
Further, the mold portions of the respective ink storage grooves 14 which are opposed to each other when they are combined are formed so as to be located on the same line.

Specifically, as shown in the female mold shown in FIG. 8, two molds 48 for forming a columnar portion around the relay core hole are arranged in parallel, and the two ink molds are traversed across the two molds. Mold "nesting" corresponding to ink retaining groove (lateral groove) (indicated by reference numeral 50)
Are mounted in a flat plate shape having a semicircular notch 50a (for forming the wall of the relay core hole 46). The "nesting" in this female mold is two female molds (ink retaining groove) in one sheet
In order to cope with the above, two notches 50a are provided. As a result, the two divided ink reservoirs have the same molding conditions (resin temperature, injection pressure), the same "shrinkage" of the resin, and the two opposite ink reservoirs. The ink-reservoir grooves are formed symmetrically without any misalignment (without being staggered).

The male mold shown in FIG. 7 is provided with a semicircular column-shaped mold part 52 for forming the relay core hole 46 of the ink reservoir in parallel. At the same time, a stepped mold portion 54 for forming the ink circulation groove 16 in one of the divided ink reservoirs.
Are formed in a flat shape slightly protruding. Since the step-shaped portion 54 is formed integrally or separately from the parting surface 56a of the male base 56, the pressure of the injected resin can be received by the base 56, and the ink flow groove is formed as in the related art. The forming mold does not fall down.

Although not shown, the other of the divided ink reservoirs does not require the formation of the ink flow groove 16, and the portion corresponding to the ink flow groove does not have the stepped shoulder. What is necessary is just to make it a flat molding surface. In addition, the effect of having the ink circulation groove located on one surface of the coupling surface of the ink reservoir instead of the "groove width center" is as follows.
By reducing the number of processing parts of the mold, it is possible to reduce the mold manufacturing cost. In other words, if the ink circulation groove is provided in the “groove width center portion”, the parting surface of the mold of each of the two divided ink reservoirs (the mating surface when combined as a reservoir) is formed with a vertical groove. It is necessary to provide the “carved” and “step” of the present invention, but the “carved” and “step” in the present invention form a vertical groove by providing only one of the divided molds for the ink reservoir. Therefore, the labor for processing can be reduced by one.

FIGS. 4 and 5 show an example of a method of connecting the ink reservoir according to the present invention. In this method, the ink reservoir formed by combining the male mold and the female mold is molded so as to have a joint portion (for example, a protrusion 58a on one side and a hole 58b on the other side). According to this, the respective ink reservoirs molded by the same mold will surely be connected to each other.
In addition, each ink reservoir (radial direction and axial direction)
Positioning is also easy.

FIG. 9 shows an example in which the relay core 32 is inserted into the ink reservoir 10. By sandwiching the relay core 32 in this manner, the relay core 32 can be placed in an accurate position without forcibly inserting the relay core 32 into the relay core hole 46, and the relay core 32 is axially oriented in the relay core 32. The gap (not shown) for supplying the ink to the pen tip is not destroyed.

Next, an ink reservoir according to the second embodiment will be described with reference to FIGS. In the figure, the same reference numerals are given to the same parts as in the first embodiment, and the description is omitted. The ink reservoir 10 is provided with an ink communication groove 60.
A thick plate-shaped ink occluding body 62 having a rectangular shape in a plan view formed by molding a porous body or a fibrous body into each of the ink retaining grooves 14, 14,.
And the ink tank 30.
The ink circulation groove 60 need not be a slit through which ink flows and exhibits a predetermined capillary force as in the first embodiment, and may be any width as long as it can accommodate the ink occluding body 62. Capillary force is exerted by the ink occluding body 62 and can mediate exchange of ink between the ink retaining groove and the relay core.
More specifically, when the pressure in the ink tank 30 rises due to a difference in temperature or air pressure, the ink storage body 62 absorbs the ink in advance, and the ink storage grooves 14, 14,. To reduce the pressure rise in the ink tank 30. When the ink is consumed during writing, the pressure in the ink tank 30 is reduced, and first, the ink is returned from the ink storage grooves 14, 14,.
Further, when the consumption of the ink continues, the air is taken into the tank 30 through the ink occluding body 62 to reduce the decrease in the pressure. As described above, since the setting of the capillary force can be set by the capillary force of the ink occluding body 62 without setting by the gap of the ink circulation groove 60, a predetermined force can be obtained without strictly pursuing the molding accuracy of the ink reservoir. Since performance is obtained, molding efficiency and production efficiency are improved.

Next, an ink reservoir according to a third embodiment will be described with reference to FIGS. The same reference numerals are given to the same parts as in the first embodiment, and the description is omitted. The ink reservoir according to the third embodiment has a cylindrical portion 8 through which the relay core 32 passes.
A resin material is injection-molded in a lamination state with a plurality of disc-shaped sheet bodies 12 around the periphery of the sheet, the gaps between the sheet bodies 12 are used as ink storage grooves 14, and the ink storage grooves 14 are connected to each other. An ink reservoir communicating with an ink storage 66 through 64.

The ink reservoir 10 is formed in a state where it is divided into at least two parts by a coupling surface (divided surface) 18 along the axial direction as a boundary, and the coupling surfaces 18, 20 of the divided ink reservoirs 20, 20 are divided. 18 are joined together. The ink communication passage is provided with an ink reservoir 10 (in the embodiment,
The cylindrical portion 8 of one of the divided ink reservoirs 20, 20)
Are formed on the inner surface (side surface of the relay core hole 46) of the communication hole 6 that connects the plurality of ink retaining grooves 14, 14,.
4 is formed along the axial direction. As shown in FIG. 14, a communication hole 64 that penetrates a quarter of a circular arc in a substantially sector shape when a cylindrical portion 8 of one ink storage body 20 is viewed in cross section is formed. Also, the relay core hole 46
The central portion 46a is thick (to match the outer diameter of the ink occluding body 66), and both end portions 46b, 46b are (the relay core 32).
Outside diameter).

Further, in the thick central portion 46a of the relay core hole 46 inside the cylindrical portion 8, it faces the ink storage grooves 14, 14,... Through the communication hole 64 and guides the ink to the ink relay core 32. In this manner, the ink occluding body 66 is provided. The ink occluding body 66 is formed by molding a porous body or a fibrous body, and is formed into a hollow cylindrical shape so as to surround and contact the outer periphery of the cylindrical ink relay core 32 as shown in FIG. It is. With this ink storage body 66, like the ink storage body of the second embodiment,
The ink in the ink retaining grooves 14, 14,.
, And the ink of the relay core 32 can be guided to the ink storage grooves 14, 14,.
The ink that has been introduced into the ink tank 30 and overflowed from the ink tank 30 can be smoothly stored in the ink storing groove 14, and can be guided to the pen core 34 as needed and used without waste. That is, in the present invention, the function of the ink reservoir (collector) can be fully exhibited by interposing and installing the ink occluding body without forming a slit (vertical groove) as in the related art.

Then, any one of the ink occluding bodies 62,
The capillary force of 66 is set to be equal to or greater than the capillary force of the ink retaining grooves 14, 14,... Between the sheets 12, 12,. As a result, the ink is strongly retained in the ink occluding bodies 62, 66, and the ink in the ink storage grooves 14, 14,... Can be reliably guided to the ink occluding body 62. As a material of the ink occluding body, a material having a weak capillary force and a good ink leakage property is desirable. For example, hydrophilic sponge, melamine foam and the like can be mentioned, but it is also possible to have a structure integrated with a pen core. Further, in the third embodiment, the ink reservoirs in the divided state shown in FIGS. 13 and 14 are combined with each other. In addition, two ink reservoirs in the divided state shown in FIG. 14 are combined to form an ink reservoir. It is a good thing.

Needless to say, the present embodiment refers to a direct liquid writing tool (raw ink type writing tool), but the present invention is not limited to this, and direct liquid The present invention can be applied to an ink reservoir of an ink jet cartridge having a function, and further to an ink reservoir of another writing instrument or applicator.

[0031]

As described above, according to the present invention, even if the width of the ink retaining groove or the ink circulation groove is small, the groove molding die does not fall down due to the injection pressure and the like, and as designed. Can be manufactured.

In addition, since the ink circulation groove is not located at the center of the groove width but at one side of the coupling surface of the ink reservoir, the number of processing portions of the mold is reduced. Mold production costs can be reduced. In the present invention, the longitudinal groove can be formed by providing the concave portion only in one of the divided molds for the ink reservoir, so that the processing time can be reduced. In addition, the ink occluding body can surely guide the ink in the ink storage groove between the sheet and the sheet to the relay core, and can guide the ink in the relay core to the ink storage groove, and this function overflows the ink tank. The used ink can be smoothly stored in the ink storing groove, and can be guided to the pen core as needed and used without waste. In other words, the present invention eliminates the need for forming a slit (longitudinal groove) as in the prior art and further processing a fine space for guiding ink to the slit, thereby eliminating the need for an ink occluding body. In this way, the ink can be easily and stably wetted with the ink, so that the function of the ink reservoir (collector) can be fully exhibited. Therefore, the mold for the ink reservoir does not need to be a conventional slit mold, and the processing time can be greatly reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views of an ink reservoir according to a first embodiment of the present invention, wherein FIG. 1A is a side view, FIG. 1B is a side view of a side having an ink circulation groove, FIG. (D) is a top view.

FIGS. 2A and 2B are explanatory views of the ink reservoir of FIG. 1, wherein FIG. 2A is a side view in a divided state, FIG. 2B is a bottom view, and FIG. FIG.

FIG. 3 is an explanatory view of the ink reservoir of FIG. 1, and is a perspective view of a divided state.

FIG. 4 is a perspective explanatory view of one of the divided ink reservoirs of FIG. 1;

FIG. 5 is a perspective explanatory view of the other divided ink reservoir of FIG. 1;

FIG. 6 is an explanatory view of a raw ink type writing instrument provided with an ink reservoir according to the present invention.

FIG. 7 is an explanatory view of a mold (male mold) of the ink reservoir according to the present invention.

FIG. 8 is an explanatory diagram of a mold (female mold) of the ink reservoir according to the present invention.

FIG. 9 is an explanatory diagram of an example in which a relay core is attached to the ink reservoir.

FIG. 10 is an explanatory cross-sectional view of a writing instrument provided with an ink reservoir according to Embodiment 2 of the present invention.

FIG. 11 is a perspective explanatory view of the ink reservoir and the ink ink absorber of FIG. 10;

FIG. 12 is an explanatory view of the ink reservoir of FIG. 10 as viewed in the XII direction.

FIG. 13 is a configuration explanatory view of one of the divided ink storage bodies in the ink storage body according to the third embodiment;
Is an outer side view, (b) is a bottom view, and (c) is an inner side view.

14A and 14B are explanatory views of an ink reservoir in which the other communication hole in a divided state is formed, wherein FIG. 14A is an outer side view, FIG. 14B is a bottom view, and FIG. 14C is an inner side view. It is.

FIG. 15 (a) shows an ink reservoir of Embodiment 3 and (b),
(C) is an explanatory view in which an ink occluding body is provided on the outer periphery of the ink relay core.

[Explanation of symbols]

 Reference Signs List 8 cylindrical portion 10 ink storage body 12 sheet body 14 ink storage groove 16 ink circulation groove (communication groove) 18 coupling surface 20, 20 divided ink storage body 60 ink circulation groove 62 ink storage body 64 communication hole 66 Ink absorber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B43K 8/02 B43K 8/02 Z

Claims (8)

[Claims] A plurality of disc-shaped sheet bodies are resin-molded in a laminated state with a gap, the gap between the sheet bodies is an ink storage groove, and the ink storage grooves are connected by at least one communication passage. An ink reservoir communicating with the ink reservoir, wherein the ink reservoir is formed in a state of being divided into at least two parts by a boundary surface along the axial direction, and the coupling surfaces of the divided ink reservoirs are joined together. Wherein at least one of the divided ink reservoirs has a communication path formed on the coupling surface side to connect an ink reservoir groove between the sheet-like bodies. body. 2. A concave portion is formed on at least one of the coupling surfaces facing each other of the ink reservoir in a divided state, and when the coupling surfaces are joined, the concave portion and the other coupling surface are combined. The ink reservoir according to claim 1, wherein the ink passage is formed. 3. The ink reservoir according to claim 1, wherein an ink occluding body is interposed in the communication path. 4. A plurality of disc-shaped sheet bodies are resin-molded in a laminated state with a gap around a cylindrical portion through which a relay core passes, and the gap between the sheet bodies is used as an ink retaining groove, and What is claimed is: 1. An ink reservoir, in which reservoir grooves communicate with each other through at least one communication path, wherein the ink reservoir is formed and divided into at least two parts on a boundary surface along an axial direction. The connecting surfaces of the ink reservoirs in the state are joined together, and the communication path is a communication hole that connects a plurality of ink retaining grooves between the inner surface of the ink reservoir tubular portion and the sheet. An ink reservoir, characterized by forming the following. 5. An ink occluding body is provided inside the cylindrical portion so as to face the ink retaining groove through the communication hole and guide the ink to the ink relay core. 3. An ink reservoir according to claim 1. 6. The ink reservoir according to claim 4, wherein the capillary force of the ink occluding body is set to be equal to or greater than the capillary force of the ink retaining groove between the sheets. 7. The ink reservoir is formed by laminating substantially disc-shaped sheet bodies so as to have a substantially cylindrical outer shape, and is divided into two parts by a joint surface passing through an axis. The ink reservoir according to any one of claims 1 to 6, wherein 8. The method for manufacturing the ink reservoir according to claim 2 or 3, wherein a mold for forming the ink reservoir in the divided state is a mold in which the divided ink reservoirs are arranged in parallel. Wherein the mold portions of the respective ink storage grooves which are opposed to each other when they are combined are formed so as to be located on the same line.