KR100449112B1 - Collector of a pen and a molding device for manufacturing same - Google Patents

Abstract

The collector is molded by injecting resin into the mold cavity, and is a collector in which the resin inflow portion from the gate is formed in at least two front and rear positions in the axial direction of the collector, thereby preventing resin shortage in each portion.

Description

COLLECTOR OF A PEN AND A MOLDING DEVICE FOR MANUFACTURING SAME}

According to the present invention, a pen such as a ballpoint pen, a sine pen, a marker, or a fountain pen having a pen tip, which is a writing unit at the tip, includes an ink tank for directly storing ink, and a collector which is a regulator using a capillary phenomenon to adjust internal pressure. The present invention relates to an improvement in a collector and a collector injection molding apparatus for a collector used in a straight liquid collector-type writing instrument.

Conventionally, a writing instrument (collector-type writing instrument) provided with a collector for the purpose of preventing ink leakage from the nib or ejecting from the air hole while maintaining ink in a liquid state by adjusting the pressure in the ink tank between the nib and the ink tank. Is known. In general, a collector-type writing instrument has a gap between a nib having a writing portion at its tip, an ink tank for storing ink, a central core for guiding ink from the ink tank to the writing portion, and a plurality of plate-shaped wings (maintenance). And a collector, which is a regulator that allows ink to enter and exit the capillary phenomenon through the longitudinal groove from the gas-liquid replacement portion in contact with the ink tank.

Such a collector-type writing instrument can be written in a dark line without decreasing the ink outflow amount until the end of writing, even if the flow rate of the ink is equal to or higher than that of the middle writing instrument. Can be mounted in a large amount, and the ink remaining amount in the liquid-liquid state can be confirmed from the transparent portion of the tank.

Collector-type writing instruments wet the ink in the ink tank by contacting the collector end face and the gas-liquid substituting unit with ink, and blocking the ink or air from the gas-liquid substituting unit having a sufficient capillary force and blocking the outside air from the gas-liquid substituting unit. The gas-liquid replacement portion is substantially reduced in pressure on the ink tank side due to the action of the meniscus due to the strong capillary force, so that ink does not flow out from the tip of the pen tip even when downward. It is a writing instrument using a mechanism.

In collector-type writing instruments, it has been found that the height (head) from the gas-liquid replacement portion and the tip of the tip of the collector cannot be set above a certain height. Similarly, when the capillary force of the width of the gas-liquid replacement portion and the retaining groove is increased (when the size is small), the head can be raised to some extent by the strong meniscus and the internal pressure inside the ink tank is lowered. If too low, ink cannot be supplied at the time of writing, resulting in a defect such as faintness. Generally, the gas-liquid replacement part is a groove or a hole of about 0.05 mm to 0.2 mm, the holding groove is set to a narrow width of the ink tank side to 0.1 to 0.4 mm, and the nib side is set to be slightly wider to about 0.2 to 1.5 mm. have.

The collector is formed by arranging a thin and long ink groove in which the wings are drilled in the longitudinal groove in the axial direction (wing overlapping direction) and a retaining groove which is a gap between the wings in the radial direction with a plurality of appropriately set widths. In this case, it is necessary to mold the thin ink grooves and the plurality of holding grooves to the correct set dimensions, so that the mold release resistance at the time of molding is increased, and a plurality of ejection portions at the time of ejecting from the mold must be provided. . Therefore, it is necessary to increase the thickness of a part of the wings, and at the time of forming the collector, due to the influence of complicated component structure or complicated mold structure, deterioration of air or gas discharge from the thickness of the wing, etc. The case where the injected resin does not sufficiently reach the entire complex cavity such as a plurality of thin wings occurs, so that the possibility of so-called resin shortage (unmolded) may occur in the blade after molding. In particular, when a collector in which resin shortage has occurred in the vicinity of the gas-liquid replacement part is used for the writing instrument, it cannot be molded as the gas-liquid replacement part is set due to the resin shortage, and there is a problem that causes a problem in the function of adjusting the pressure in the ink tank. In addition, when the collector in which resin shortage occurred in the thickness part of a wing | blade is used, since the setting width | variety of a holding groove does not become the width which set, there existed a problem that the function which hold | maintains an ink generate | occur | produces.

The present invention aims mainly at the improvement of the collector and the collector mold apparatus of a popular type collector writing instrument, and in particular, the problem of so-called resin shortage occurring near the gas-liquid replacement portion of the collector during collector molding, and the resin near the gas-liquid replacement portion. In case of using a collector which has a shortage, the problem of causing an impairment in the function of adjusting the pressure in the ink tank, and the use of a collector in which resin shortage has occurred in the thickness of the blade, do not set the retaining groove as set. To provide a collector of a writing instrument and a mold apparatus of the collector that can solve the problem that a defect occurs in the function to maintain the problem without sacrificing the excellent writing ability of the conventional collector-type writing instruments and at no cost It is aimed.

The present invention has been made to achieve the above object, and the gist thereof is as follows.

First, the first aspect of the present invention relates to a writing instrument having induction means such as a central core for guiding ink from an ink tank for storing a relatively low viscosity ink having a viscosity of 2 to 100 mPa · s in a liquid state to a writing unit at room temperature. Is a collector using a capillary phenomenon that adjusts the internal pressure of an ink tank by allowing ink to enter and exit from a gas-liquid replacement portion through a vertical groove in an ink holding groove between wings, and is a writing instrument that is molded by injecting resin into a mold cavity. The collector is a collector of a writing instrument characterized in that the resin inlet is formed at at least two front and back positions in the axial direction of the collector.

Next, the 2nd summary of this invention is a collector of the writing implement as described in the said 1st summary, which provided the resin inflow part in the thickness part of the blade | wing of at least 2 front and back of a collector.

Moreover, the 3rd summary of this invention is a collector of the writing implement as described in said 1st summary characterized by making the thickness part of a wing into an ejection part.

A fourth aspect of the present invention resides in the collector of the writing instrument described in the second aspect, wherein the thickness of the blade is used as an ejection portion.

The fifth aspect of the present invention is the collector of the writing instrument according to the first aspect of the present invention, wherein the resin inflow portion is provided at a thickness portion where the nib or seam indentation portion of the collector front portion and the gas-liquid substitute portion of the collector rear portion are disposed or near them. Is in.

Next, the sixth aspect of the present invention is characterized in that the confluence of resin introduced from the resin inflow portion at the front and rear at the time of molding is not present at any other portion of the member indentation portion and the airtight holding indentation portion of the collector. It is a collector of the writing implement described in the said 1st summary.

In addition, the seventh aspect of the present invention, in a writing instrument having induction means such as a central core for guiding ink from an ink tank for storing a relatively low viscosity ink having a viscosity of 2 to 100 mPa · s in a direct liquid state at a normal temperature from the ink tank to the writing unit, The mold is formed so that the resin inlet is formed in at least two front and rear positions in the axial direction of the collector, which is a capillary phenomenon that adjusts the internal pressure of the ink tank by allowing ink to enter and exit from the gas-liquid replacement portion through the vertical groove in the ink holding groove between the wings. In a mold apparatus for molding a collector by injecting resin into a cavity, at least one of the resin inflow portions opened into the cavity of the mold is formed such that an angle α in the opening direction with respect to the dividing direction of the mold is 10 ° <α <90 °. It is in the metal mold | die apparatus of the collector of the writing implement characterized by the above-mentioned.

Next, the eighth aspect of the present invention is a mold apparatus for a collector of a writing instrument according to the seventh aspect, wherein the resin inflow portion is provided at the thickness portions of at least two front and rear portions of the collector.

Moreover, the 9th summary of this invention exists in the metal mold | die collection apparatus of the writing instrument of the said 7th summary characterized by making the thickness part of a blade into an ejection part.

Next, the tenth aspect of the present invention is a mold apparatus for a collector of writing instruments according to the eighth aspect, wherein the thickness of the blade is used as an ejection portion.

In addition, the eleventh aspect of the present invention is the writing apparatus according to the seventh aspect of the present invention, wherein the resin inflow portion is provided at a thickness portion where the nib or seam indentation portion of the collector front portion and the gas-liquid substitute portion of the collector rear portion are arranged or near them. It is in the mold apparatus of the collector.

Further, a twelfth aspect of the present invention is characterized in that the confluence of resin introduced from the resin inflow portion at the front and rear at the time of molding is not present at any other portion of the member indentation portion and the airtight indentation portion of the collector. It is in the metal mold | die apparatus of the collector of the writing implement described in the said 7th summary.

In the present invention, the resin is moved forward at the time of collector molding at at least two front and rear positions in the axial direction of the collector (including adding a gate at any one of the front, rear and one rear side at the center). It flows in from the side gate and the back side gate, flows out resin, and it discharge | releases air and gas well, and can fully fill resin in the cavity of a metal mold | die apparatus. Therefore, when the capillary force of the width | variety of the gas-liquid substitution part and the holding groove is strengthened (it is made small in size), resin collector does not generate | occur | produce a resin at least as a whole. Therefore, since resin shortage does not generate | occur | produce in the vicinity of the gas-liquid substitution part which specifically requires precision, the writing instrument using the collector of this invention can fully exhibit the function of adjusting the pressure in an ink tank. In addition, since resin shortage does not occur in the thickness portion of the blade, when the collector is used, the width of the retaining groove becomes accurate to the set width, so that the function of holding the ink can be sufficiently exhibited without a defect in the function of retaining ink. For this reason, it can solve without incurring the cost without sacrificing the outstanding handwriting property which the conventional collector type writing instruments have.

In addition, by providing a gate in the thickness portion of the blade in addition to the above means, the resin flow is smoothed to prevent resin shortage, to secure the ink holding function in the thickness portion, and the filling of the resin proceeds smoothly. As a result, the resin shortage around the gas-liquid substitution part is also prevented.

In addition, when the thickness of the wing is used as the ejection part, when the collector is resin-molded, the part where the ejection rod touches (the ejection part) is used as the thickness of the wing in order to push the collector out of the mold. The collector can be released smoothly. It is preferable to make the direction which ejects a collector from a metal mold | die into the plane direction of a blade | wing.

In addition, the resin inflow portion has a thickness in which the nib or seam indentation portion of the collector front portion and the gas-liquid replacement portion of the collector rear portion are disposed, thereby smoothing the resin flow, preventing resin shortage, and securing an ink holding function at the thickness portion. In addition, since the filling of the resin proceeds smoothly, the resin shortage around the gas-liquid substitution part is also prevented as a result.

In addition, if the confluence (weld) of the resin which flows in from the resin inflow part at the front and rear at the time of shaping | molding is in neither the member indentation part nor the airtight holding indentation part of a collector, it will be in another part, Since the weld part, which is a joining point of, is likely to cause a problem of indentation cracking or poor sealing, it is better to prevent the weld from appearing in the sealing part for indentation or airtightness of a member such as a nib.

In addition, according to the mold apparatus for molding the collector of the writing instrument of the present invention, since the angle α in the opening direction of the gate is formed at 10 ° <α <90 ° with respect to the dividing direction of the mold, the mold is opened and the collector molded product is opened. During the mold release operation, the resin in the gate portion of the mold is separated from the collector molded product. In addition, if the angle α is 10 ° or less, the mold is likely to be broken, while if it is 90 ° or more, it is difficult to remove the resin in the vicinity of the gate, but according to the sixth effective means, the angle α is set to 10 ° <α <90 °. As a result, damage to the mold can be prevented, and the resin near the gate can be easily removed. Therefore, in general injection molding, the resin at the gate portion becomes a burr for the finished product, or it is necessary to remove it by hand or the like, which is a cause of the workload, but according to the present invention, when the collector is separated from the mold, The gate portion can be removed from the finished product, and the collector molding operation can be made more efficient. In addition, accuracy is higher than that of manual burr separation, and deterioration of wettability due to adhesion of oil on the hand can be prevented, so that defects are reduced and the yield rate is improved.

1 is a longitudinal cross-sectional view showing the entire writing instrument body according to an embodiment of the present invention;

FIG. 2 is an enlarged longitudinal sectional view of the tip side of the writing instrument of FIG. 1. FIG.

3 is an external view of an ink groove side of a collector which is a component;

4 is an external view of an air groove side of a collector which is a component;

5 is a view taken along the line A-A of FIG.

6 is an explanatory diagram of a cavity terminating a mold apparatus for collector molding;

7A is an explanatory diagram of a cavity traversing a mold apparatus;

7B is an explanatory diagram of a state in which a mold is divided and a gate is cut from the collector;

FIG. 8 is an explanatory view of a mold apparatus cut along the X-X line of FIG. 3. FIG.

Explanation of symbols for the main parts of the drawings

1: tip of the writing unit 2: nib

3: Center 4: Vent

5: collector 6: collector shim

7: ink tank 8: ink

9: gas-liquid substitution part 10: ejection part

11: ink groove 12: air groove

13: wing 14: holding groove

13a: thickness of the blade where the gas-liquid substitute is disposed

13b: thickness of wings other than 13a

20, 21: resin inlet 22, 23: split mold

24: cavity H: ink head

α: angle between the gate opening direction and the mold dividing direction

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing. BRIEF DESCRIPTION OF THE DRAWINGS The figure shows an example of embodiment of this invention, FIG. 1 is a longitudinal cross-sectional view which shows the whole of the writing instrument main body, FIG. 2 is an enlarged longitudinal cross-sectional view of the front end side, FIG. 3 is an external view of the ink groove side of the collector which is a component, FIG. 5 is a cutaway view along the AA line of FIG. 3, FIG. 6 is an explanatory view of a cavity terminating the collector mold apparatus, and FIGS. 7A and 7B are cavities crossing the mold apparatus. It is explanatory drawing of the state in which the metal mold | die was divided and the gate was cut | disconnected from the collector.

The ink 8 usable for the collector-type writing instrument of the embodiment includes 40% or more of water, an alcoholic solvent, and the like as the main solvent, and 1 to 30% of colorants such as dyes and pigments, propylene glycol, glycerin, higher alcohols, and the like. It is an ink which consists of 3-40% of nonvolatile solvents, and other additives, such as a lubricating agent, an antiseptic, and a dispersing agent, and is a viscosity of 2-100 mPa * s at normal temperature (25 degreeC).

In addition, the collector type ballpoint pen of the example shown in FIG. 1 has the pen tip 2 which loosely inserts the writing ball rotatably and inseparably at the tip 1 of the writing part A, and inside the ink tank 7 inside. The inlet part which guides ink contained in the part to the ball | bowl by the collector shim 6 and the center core 3, and provides an air path between the collector 5 and the nib 1, and displays a color (2a) and the joint 2b are provided. An air passage (ventilator 4) is provided between the inlet portion 2a and the joint 2b to communicate the air groove 12 of the collector 5 to the outside air.

In the collector-type writing instrument, the ink tank 7 has a shaft shape, and accommodates the collector 5 in a state where the plurality of wings 13 are arranged in the front portion 7a, and the rear portion stores the ink 8. It becomes a space. A gas-liquid replacement portion that stores the ink 8 in a liquid-liquid state in the rear portion 7b of the ink tank 7, and exerts a strong capillary force due to a thin groove shape or the like around the rear end of the collector 5. (9) 9 is wetted with ink 8 so as to form a meniscus and is sealed, and portions other than the gas-liquid substitute 9 are usually air circulating or leaking ink 8 It is configured so that it does not happen. Moreover, the blade | wing 13 is provided with the thickness parts 13a and 13b of the blade | wing between the formation part of the gas-liquid substitution part 9 of the collector rear end part, and the some thin plate-shaped blade | wing 13.

In collector-type writing instruments, it has been found that the height (head H) from the gas-liquid substitute 9 and the nib tip 1 of the collector 5 cannot be set above a certain height. Similarly, when the capillary force of the widths of the gas-liquid replacement part 9 and the retaining groove 14 is made stronger (when the size is smaller), the meniscus acts strongly and the internal pressure inside the ink tank 7 is lowered, so that the head H is reduced. Although it can be made high to some extent, when the internal pressure falls too much, ink 8 cannot be supplied at the time of writing, and defects, such as a blur, will arise. In general, the gas-liquid substitute 9 is a groove or a hole of about 0.05 mm to 0.2 mm, and the retaining groove 14 is set to a narrow width of 0.1 to 0.4 mm on the ink tank 7 side, and the nib side is slightly wide. It is set to about 0.2-1.5 mm widely.

If resin shortage occurs during molding around the gas-liquid substitute 9, formation of the meniscus by the ink 8 is not performed well, and the internal pressure of the ink tank 7 is not substantially reduced in pressure or a deviation occurs. Therefore, in the downward direction, the ink 8 may flow out from the tip of the pen tip.

When the internal pressure in the ink tank 7 rises relatively due to the increase in the external air temperature or the decompression of the outside air, the ink 8 in the ink tank 7 passes through the gas-liquid substitute 9 to the collector 5. The ink 8 flows into and is retained in the holding groove 14 which is a gap between the circumferential wings 13 of the circumferential blade), and the internal pressure is balanced. The plurality of retaining grooves 14 are connected to each other so that the ink can be flowed by the ink groove l1 connected to the gas-liquid substitute 9, but when resin shortage occurs in the wing 13, an imbalance in capillary force is caused. May occur, and the ink holding function may not operate normally.

When the internal pressure is relatively low, such as when the outside temperature decreases, the outside air is pressurized, or the ink 8 decreases due to writing, the ink 8 held in the retaining groove 14 of the collector 5 is stored in the ink tank. (7) When returning to the inside or when there is no ink 8 in the holding groove 14, the outside air is introduced into the ink tank 7, and the ink 8 in a liquid state by a mechanism for balancing internal pressure. In addition, the ink 8 can be prevented from leaking to the outside of the writing instrument during normal use. However, if a resin shortage occurs around the gas-liquid replacement unit, the internal pressure is not balanced and the ink is maintained. Sometimes the function does not work properly.

As an embodiment of the present invention for solving this problem, the collector 5 is provided with a retaining groove 14 and a blade 13 having a pressure resistance adjustment function known from the prior art, and the shaft of the collector 5 is provided. Resin inflow from the gates 20a and 20b in at least two front and rear positions in the direction (including adding the gates 20a and 21a at any position before, after and at the front and one back) Since 20 and 21 are provided, resin flows in from the front side gate and the rear side gate at the time of forming the collector 5 in the mold apparatus, and the flow of resin and the outflow of air or gas are good, and the cavity of the mold apparatus is provided. Resin can be sufficiently filled in each place in (24) (space between the inner surfaces of molds 22 and 23 and core pin 25). Therefore, when the capillary force of the width | variety of the gas-liquid substitution part 9 and the holding groove 14 is made strong (when the size is made small), the collector 5 will not generate resin shortage as a whole. Therefore, since resin shortage does not generate | occur | produce especially in the vicinity of the gas-liquid substitution part 9 which requires precision, the writing implement using the collector of this invention can fully exhibit the function which adjusts the pressure in the ink tank 7. In addition, since resin shortage does not occur in the thickness portions 13a and 13b of the blades, when the collector 5 is used, the width of the retaining groove 14 becomes precise with the set width, so that the function of holding ink is poor. The function of the collector 5 can be fully exhibited so that it may not generate | occur | produce. For this reason, it can solve without incurring the cost without sacrificing the outstanding handwriting property which the conventional collector type writing instruments have.

The resin inflow portions 20 and 21 can be the thickness portions 13b of at least two front and rear wings of the collector 5 in addition to the position or together with the position. As shown by the dashed-dotted line in FIG. 6, by providing a gate in the thickness portion 13b of the blade, the resin flows smoothly to prevent resin shortage and to secure the ink holding function in the thickness portion. However, since the filling of the resin proceeds smoothly, the resin shortage around the gas-liquid substitution part is also prevented as a result.

Moreover, the thickness part 13b (it may also include the thickness part 13a) of a wing | blade can be used as an ejection part. In this case, when the collector 5 is resin-molded, the portion (eject portion 10) to which the ejecting rod contacts in order to push the collector out of the molds 22 and 23 is formed by the thickness portion 13b (or the thickness portion ( 13a)], the collector 5 can be easily released from the mold without being deformed even when the ejector rod touches it. It is preferable to make the direction which ejects a collector from a metal mold | die into the plane direction (radial direction) of a blade | wing.

In addition, the resin inflow parts 20 and 21 are made into the thickness part 13a in which the nib 1 or the joint indentation part 5a of the collector front part, and the gas-liquid replacement part 9 of the collector rear part are arrange | positioned. In this way, the resin inflow parts 20 and 21 are made into the thickness part 13a by which the nib or joint indentation part 5a of the collector front part and the gas-liquid replacement part 9 of the collector rear part are arrange | positioned, The resin shortage can be prevented smoothly, the ink holding function in the thickness portion 13a is not only secured, and the filling of the resin proceeds smoothly, and as a result, the resin shortage around the gas-liquid replacement portion is also prevented.

In the mold apparatus of the said collector 5, as shown in FIG. 7, the gate 20a, 21a opened into the cavity 24 of a metal mold | die is the said gate opening direction with respect to the dividing direction of the metal molds 22, 23. As shown in FIG. Angle (alpha) of (20a, 21a) is formed in 10 degrees <(alpha) <90 degrees. According to this, since the said angle (alpha) is made | formed, resin of the gate part 20a, 21a part of a metal mold | die is isolate | separated from the collector molded product at the time of the operation | movement which molds 22 and 23 open and a collector molded product releases. In addition, when the angle α is 10 ° or less, the mold is easily broken. On the other hand, when the angle α is 90 ° or more, it is difficult to remove the resin near the gate. However, since the angle α is set to 10 ° <α <90 °, damage to the mold is prevented. It can prevent and also remove the resin of the gate vicinity easily. Therefore, in general injection molding, the resin of the gate portion becomes a burr with respect to the finished product, and it is necessary to remove it by hand or the like, which is a cause of the work load. However, according to the present embodiment, when the collector 5 is separated from the mold, Portions of the gates 20a and 21a can be removed from the finished product, and the collector molding operation can be made more efficient. In addition, compared to the manual burr separation by hand, the accuracy is high, the defect is reduced, the yield rate is improved, and the problem caused by the adhesion of oil of the hand is prevented, it is advantageous in terms of cost.

At the confluence point (weld) of the resin which flowed in from the front and the back at the time of shaping | molding, a weld becomes difficult to ensure sealing property because a gas becomes hard to shape | mold or the shape is unstable, and it is lacking in strength and a crack arises, It is preferable to set the position, the size of the gate, and the flow of the resin so that the member press-fit part and the collector's hermetic press-fit part are not located.

In addition, by providing the ejection part 10 in the vicinity of the gas-liquid substitution part 9 in the metal mold | die at the time of collector shaping | molding, resin shortage of the part can be prevented. By using the collector 5 in which the ejection part 10 used as a gas discharge port is provided in concave shape lower than the periphery for writing instruments, the sealing property around the gas-liquid substitution part by the ink 8 is not impaired. In the present embodiment, the concave shape of the ejection portion 10 is 0.01 mm to 0.2 mm lower than its periphery, and is shown as a rectangle, but may be annular or polygonal.

3 and 4, not only the thickness portion 13a of the blade on which the gas-liquid substitute 9 is disposed, but also the thickness portion 13b of the other blade in the mold during collector molding. ), The ejector portion 10 is provided in the collector 5 as a concave shape lower than the periphery, so that the resin shortage near the gas-liquid replacement portion is eliminated and the holding groove ( Since the setting width of 14) can be set as it is, the problem can be solved similarly by using this collector 5 for writing instruments.

In addition, as shown in FIG. 3 and FIG. 4 in the molding die, a half section having gas outlets 10a provided on both sides with a gas-liquid substitute 9 interposed therebetween, and further having a gas-liquid substitute. By providing the gas outlet 10b at the half end surface on the opposite side to the opposite side, the ejector portion 10 serving as the gas outlet is provided in the collector 5 as a concave shape lower than the surroundings, thereby eliminating the resin shortage near the gas-liquid replacement portion. At the same time, even if resin shortages occur, resin shortages can be generated on the holding groove side on the rear end side than the gas-liquid replacement portion that does not affect the collector function, so that the problem can be solved similarly by using this collector for writing instruments. In particular, when an ejection portion (gas outlet) is provided around the confluence point of the resin flowing from the plurality of gates, the gas is no longer caused to become defective.

The collector and the collector-molding die of the present invention are configured as described above, but the present invention is not limited to the above embodiments, and various applications can be adopted as long as the gist of the present invention is not changed. As a configuration not related to the gist of the present invention, the writing instrument may be, for example, a pen, a marker, or a fountain pen in addition to a ballpoint pen. In addition, the shape of the ink tank cylinder is a cartridge, the ink tank rear portion is a cartridge, a refill form integral with the tip (ink tank front portion), a partial disposable method, or various colorings including transparent, opaque, glossy particles, or the center. The structure of the shim and the collector shim or nib is integral, the nib member or the valve part is added, and the structure of the cap can be selected in various ways.

In the collector and the collector-molding die apparatus of the present invention, when the capillary force of the width of the gas-liquid replacement portion and the holding groove is increased (when the size is reduced), the collector is less likely to generate resin shortages as a whole. . Therefore, in particular, since resin shortage does not occur in the vicinity of the gas-liquid replacement portion which requires precision, the writing instrument using the collector of the present invention can sufficiently exhibit the function of adjusting the pressure in the ink tank. In addition, since resin shortage does not occur in the thickness portion of the blade, when the collector is used, the width of the retaining groove becomes precise to the set width, and thus the function of the collector can be sufficiently exhibited without a defect in the function of retaining ink. For this reason, it can solve without incurring the cost without sacrificing the outstanding handwriting property which the conventional collector type writing instruments have.

Claims (12)

Ink holding grooves between the wings in writing instruments having induction means such as a center of gravity for guiding ink from an ink tank for storing relatively low viscosity ink having a viscosity of 2 to 100 mPa · s in a liquid state to a writing unit at normal temperature. A collector, which is a regulator using a capillary phenomenon that adjusts the internal pressure of an ink tank by allowing ink to enter and exit from a gas-liquid substitution part through a vertical groove, and is a writing instrument collector molded by injecting resin into a mold cavity. The resin inflow part is formed in at least 2 front and back in the axial direction of a collector characterized by the above-mentioned. Writing instrument collector. The method of claim 1, The resin inflow portion is provided in the thickness portion of at least two front and rear wings of the collector, characterized by the above-mentioned. Writing instrument collector. The method of claim 1, Characterized in that the thickness of the wing as an ejection part Writing instrument collector. The method of claim 2, Characterized in that the thickness of the wing as an ejection part Writing instrument collector. The method of claim 1, Resin inlet is provided in the thickness portion or the vicinity of the nib or seam indentation of the collector front portion and the gas-liquid replacement portion of the collector rear portion is characterized in that the Writing instrument collector. The method of claim 1, The confluence of resin introduced from the resin inlet at the front and rear at the time of molding is not present at any other part of the member press-fit part and the hermetic hold-in press part of the collector. Writing instrument collector. Ink holding grooves between the wings in writing instruments having induction means such as a center of gravity for guiding ink from an ink tank for storing relatively low viscosity ink having a viscosity of 2 to 100 mPa · s in a liquid state to a writing unit at normal temperature. Collecting the resin by injecting the resin into the mold cavity so that the resin inlet is formed in at least two front and rear positions in the axial direction of the collector, which is a regulator using a capillary phenomenon that adjusts the internal pressure of the ink tank by allowing ink to enter and exit from the gas-liquid substitute through the vertical groove. In the mold apparatus for molding the, At least one of the resin inlets opened into the cavity of the mold has an angle α in the opening direction with respect to the dividing direction of the mold, wherein the angle α is 10 ° <α <90 °. Mold device of writing instrument collector. The method of claim 7, wherein The resin inflow portion is provided in the thickness portion of at least two front and rear wings of the collector, characterized by the above-mentioned. Mold device of writing instrument collector. The method of claim 7, wherein Characterized in that the thickness of the wing as an ejection part Mold device of writing instrument collector. The method of claim 8, Characterized in that the thickness of the wing as an ejection part Mold device of writing instrument collector. The method of claim 7, wherein Resin inlet is provided in the thickness portion or the vicinity of the nib or seam indentation of the collector front portion and the gas-liquid replacement portion of the collector rear portion is characterized in that the Mold device of writing instrument collector. The method of claim 7, wherein The confluence of resin introduced from the resin inlet at the front and rear at the time of molding is not present at any other part of the member press-fit part and the hermetic hold-in press part of the collector. Mold device of writing instrument collector.