JPH1016473A - Ballpoint pen refill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a ballpoint pen refill in which a ball does not come off even if an impact is applied without ink leakage from an end of a tip by obtaining a clear handwriting with smooth writing touch feeling to be even applied to a knock type ballpoint pen carried in the state that the tip is oriented downward. SOLUTION: A ballpoint pen tip 4 is engaged with an end hole 1a of an ink containing cylinder 1 made of a metal material having a small-diameter part 11 opened at its front and a large-diameter part 12 opened at its rear end. The ballpoint pen refill comprises a coiled spring 7 for urging a ball 6 via a movable member 8 to an inner wall 4f of the front end caulked part and further a partition wall member 9 formed with an opening of an ink flow passage for controlling an ink flowing amount at a rear end face 9d with a spring bearer 9a for supporting a rear end of the spring as a front end face disposed in a connecting part 1b of the small-diameter part and large-diameter part to occlude ink 2 given by shear thinning properties and ink follower 3 in contact with rear end of the ink 2, and a tail plug 5 having a ventilating means at a rear end of the large-diameter part and engaged therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink container having a small-diameter portion opening at the front end and a large-diameter portion opening at the rear end.
An ink follower for directly filling the ink for a ballpoint pen and following the consumption of the ink and preventing the backflow of the ink is accommodated in the rear portion of the ink, and a ball-point pen tip is fitted in a tip hole thereof and a tail plug provided with a ventilation means at a rear end thereof is fitted. More specifically, the ball-point pen refill comprises a coil spring that constantly presses the ball directly or through a movable member on the inner wall surface of the tip edge caulking portion that holds the ball of the ball-point pen tip, or through the inner hole of the tip to form the ink container cylinder. The present invention relates to a ball-point pen refill disposed in a tip end hole and intended to prevent ink drying or ink leakage from a tip end portion.

[0002]

2. Description of the Related Art In a ballpoint pen refill shown in FIG. 6, a high-viscosity oil-based ballpoint pen ink 2 is directly packed in an ink container 1 having a small-diameter portion 11 opening at a front end and a large-diameter portion 12 opening at a rear end. An ink follower 3 for following ink consumption and preventing ink backflow is accommodated in the rear portion of the ink, and a ball-point pen tip 4 is fitted in a tip hole 1a thereof and a tail plug 5 provided with a ventilation means at the rear end is formed. ing. This ball-point pen refill is also well known as a knock-type ball-point pen refill which is mounted in a shaft cylinder provided with a writing body retracting mechanism for putting a writing part into and out of the shaft cylinder tip opening.

Further, a coil spring for constantly pressing the ball is provided directly or via a movable member from the inside of the tip to the inside of the tip of the ink container cylinder on the inner wall of the tip edge of the ballpoint pen tip which holds the ball. For example, as the ballpoint pen or the ballpoint pen refill having the above-mentioned structure, for example, an ink to be directly filled is an aqueous ink having a low viscosity.
Japanese Patent Application Laid-Open No. 53185/1993 discloses a method using an ink having a high viscosity in a static state similar to the ink used in the present invention, but having a viscosity reduced by rotation of a ball during writing. As disclosed in Japanese Patent Application Laid-Open No. 7-251591, various improvements have been made in pursuit of economics such as performance of sharpness of handwriting and good writing, and reduction of component cost and assembly cost with a simple structure. Have been

[0004]

A ballpoint pen containing ink provided with a shear-thinning viscosity that provides a clear handwriting with a smooth writing feel keeps the ink at a high viscosity in a static state. When the ball rotates, the ink that is in contact with the ball surface has a shearing action, which instantaneously lowers the viscosity and changes to fluid ink.Assuming that a shock has been applied to the refill or ballpoint pen, In the form of a refill or a ballpoint pen such as the type shown in FIG. A shift occurs on the contact surface between the ink and the ink, causing the entire ink to oscillate. It will be pressurized become the impact force to the ball. In the case of an ink follower, its viscosity and physical properties such as wettability with the inner wall of the ink container can be compensated for, but those that support the impact load on the ball can be held by swaging the tip edge that holds the ball. Because it is only power
If the impact force exceeds the ball holding force, the ball will ride over the leading edge and fall out.

Therefore, the above-mentioned refill and ball-point pen have no problem when used as a cap-type ball-point pen which is carried in a state in which the chip is directed upward, but this is used as a refill. When it is used in the barrel of a knock-type ballpoint pen whose writing part appears and disappears from the tip of the open barrel that is carried in the state of the above, the ball falls off due to the impact at the time of the indentation operation and the impact applied during carrying, Unless you notice it, your clothes will be stained with ink, so it has never been used as a refill for knock-on ballpoint pens.

[0006] However, the present invention uses a knock-type ballpoint pen which is carried by inserting a chip in a pocket or the like of a garment with the chip facing downward using an ink provided with a shear thinning property capable of obtaining a smooth writing feel and clear handwriting. It is intended to appear as a refill that can be used as a refill and that matches a luxury exterior design. Therefore, it is possible to prevent the ball from falling off due to the impact force applied when the chip is facing downward, and to completely prevent the ink from leaking (dropping) from the tip of the chip, and to prevent the ink from flowing out from the tip of the chip even if the ball drops. It is an object of the present invention to build a ballpoint pen refill mechanism that can be used.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an ink container having a small-diameter portion opening at the front end and a large-diameter portion opening at the rear end is provided. An ink having a high viscosity in a static state, but having a reduced viscosity due to rotation of the ball during writing, and an ink follower at the rear of the ink that follows ink consumption and prevents ink backflow. The ball-point pen tip is fitted in the tip hole of the small-diameter portion, and a coil spring for constantly pressing the ball is provided directly or via a movable member on the inner wall surface of the caulking portion at the tip edge for holding the ball. In a ball-point pen refill in which a tail plug provided with a ventilation means at the rear end of the large-diameter portion is fitted, the ink container is formed of a metal material, and an ink flow passage penetrating in the axial direction is formed. A partition member having a front end surface serving as a spring receiving portion for supporting a rear end of a coil spring for pressing a ball, and having an opening portion of an ink flow passage for regulating an ink flow amount formed as a rear end surface; By disposing the ink in the connecting portion between the small-diameter portion where the ball-point pen tip is fitted and the large-diameter portion for storing the ink, it is possible to prevent the ink from oscillating due to the impact and to prevent the ball from falling off. More preferably, the ink flow path of the partition member is opened at the front end face and does not reach the rear end face, an ink flow hole, and a lateral groove drilled toward the axis in the radial direction communicating with the ink flow hole, The partition member is formed by a vertical groove extending in the axial direction communicating with the lateral groove and the rear end face, and the ink containing cylinder containing the plastic groove is plastically deformed in a point or linear manner from the outside toward the axial center. A means for integrally fixing to the storage cylinder is added.

In the ball-point pen refill having such a structure, even if an impact is applied when the tip is in the downward state and the ink swings, the rear end face of the partition member receives most of the impact pressure due to the ink's own weight. The ink load from the opening that regulated the impact load was further reduced by the bent ink flow path formed by the vertical groove and the horizontal groove, and the impact pressure applied to the ball could be made very small. The fear of the ball dropping due to the impact has been resolved.

In the present invention, when manufacturing a ball-point pen tip of a ball-point pen refill having such a configuration, a crimping jig is pressed against a leading edge of the ball-point refill in a state where the ball is positioned in a ball house, and the ball-pressed portion is pressed against the ball. Perform caulking to form the inner wall surface of the caulking part into a spherical surface of the same shape as the ball, then hammer ring the upper surface of the ball exposed from the leading edge with a hammer rod, and plastically deform the ball seat by a predetermined amount toward the rear end to obtain the ball house. A manufacturing means for securing a clearance with the ball in the inside is used. Thereby, as a refill used for a knock-type ball-point pen in which the chip is carried in a downward state and left for a long time, it completely prevents ink leakage (dripping) from the tip of the chip, that is, holds the ball. The function of the valve mechanism is perfected by the close contact between the inner wall surface formed into a spherical surface having the same shape as the ball at the tip edge caulking portion and the ball pressed by the coil spring with the movable member interposed therebetween. Further, the rolled and crimped leading edge produces an effect of strengthening the holding force of the ball by work hardening as compared with the leading edge formed by ordinary caulking.

As described above, the risk of the ball dropping off due to the impact is eliminated by using the partition member. However, as the ball diameter becomes smaller, the thickness of the tip edge holding the ball becomes thinner and the tip becomes smaller. Since the amount of exposure of the ball from the rim is also small,
The fear that the leading edge wears and the ball falls at the time of paper contact at the time of writing is not completely wiped out even if these measures are taken. Therefore, the present invention is intended for perfection by taking measures to prevent ink from flowing out from the tip of the chip even if the ball falls. That is, the ink penetrating hole penetrating through the rear hole of the above-described ball-point pen tip is provided at a predetermined length in the axial direction so that the opening with the rear hole is kept in a perfect circle, and the ball is pressed. A movable member is interposed between the coil spring and the movable member, the ball pressing portion including the tip portion having a diameter smaller than the diameter of the ink conducting hole of the tip abutting the tip surface on the ball surface, and the ink passage on the outer periphery. The rear end face is formed with an ink rectifying portion that contacts the coil spring.Furthermore, the connecting portion that connects the ball pressing portion to the core portion whose front end portion is larger than the ink conducting hole diameter toward the ink rectifying portion is formed on a tapered surface. By forming the ball, ink is prevented from flowing out from the tip of the tip when the ball falls off. That is, when the ball falls, the movable member moves forward toward the tip of the tip, and the ink conduction hole opening provided in the above-described perfect circle of the ballpoint pen tip comes into contact with the tapered surface of the connecting portion provided in the movable member. The mechanism prevents the ink from flowing out of the tip of the tip.

The means for preventing the ink from flowing out from the tip of the chip due to the falling off of the ball is not limited to the above-mentioned means which is simply required. A similar effect can be obtained if a valve mechanism is formed in which the periphery of the opening where the hole opens at the rear hole and the contact portion provided on the ball pressing portion of the movable member resiliently urged by the coil spring abut against each other and come into close contact with the circumference. It is obtained.

According to the present invention, there is provided a ballpoint pen refill using an ink provided with a shear-thinning viscosity capable of obtaining a clear handwriting with a smooth writing feel by the above simple means, and is housed in a barrel of a knock type ballpoint pen. Prevents the ball from falling off due to the impact of the knocking operation that causes the writing section to protrude and retract from the tip opening, and ink leakage from the tip of the tip that occurs when the tip is used in a knock-type ballpoint pen that is carried downward and left for a long time The present invention provides a refill that can be used in a knock-type ball-point pen without worrying that a droop can be prevented and a valve mechanism that can prevent ink from flowing out from the tip of the tip even if the ball falls off. .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings showing embodiments. Note that the same reference numerals as those used in the description of the above-described prior art examples denote the same members and parts, and the description will be made using the same reference numerals.

FIG. 1 is a longitudinal cross-sectional view of a ballpoint pen refill storing ink having shear-thinning properties which can be mounted on a knocking ballpoint pen according to an embodiment of the present invention. In the ball-point pen refill of the present invention, the partition member 9 is connected from the small-diameter portion to the large-diameter portion to the ink container 1 made of a metal material having a small-diameter portion 11 opening at the front end and a large-diameter portion 12 opening at the rear end. The ink 2 is provided in the connecting portion 1b, and further contains an ink 2 provided with shear thinning and an ink follower 3 which is a paste-like ink backflow preventing agent which follows the consumption of the ink at the rear of the ink. A ball-point pen tip 4 is fitted into the hole 1a, and a coil spring 7 and a rear end are disposed between the ball 6 of the tip and the front end surface (spring receiving portion) 9a of the partition member described above. A movable member 8 is provided in contact with the distal end of the large diameter portion, and a tail plug 5 provided with a ventilation means is fitted at the rear end of the large diameter portion.

The ink container 1 is made of a metallic material, for example, formed by drawing stainless steel or brass material by drawing, or by drawing a pipe material of the same material only at the tip, and is opened at the tip. It has a small-diameter portion 11 and a large-diameter portion 12 opening at the rear end, has a volume capable of accommodating a considerable amount of the ink 2 and the ink follower 3, and can be formed into a small-diameter outer diameter. 1a is formed with an inner diameter to be fitted with the ballpoint pen tip 4, and a large diameter portion is formed with an inner diameter with which the tail plug 5 is fitted. Although the ink container in FIG. 1 is formed from a small diameter portion to a large diameter portion, a medium diameter portion may be formed between the small diameter portion and the large diameter portion (not shown). This is a refill used for a ballpoint pen that has a structure in which a refill that is resiliently spring-repelled and stored in a rear end direction within a shaft cylinder can be drawn easily in a shaft cylinder, and is connected from a small diameter part to a medium diameter part. The stepped portion is used as the spring receiving portion (not shown).
It is widely known that

The partition member 9 employs the ink 2 imparted with shear-thinning, and is used in the present invention as a refill of a knock-type ball-point pen which carries the chip in a downward state. As a result, the viscosity of the ink that is in contact with the inner wall of the ink container 1 is instantaneously reduced, and the weight of the ink becomes an impact force. When the tip is in the downward state, the ball 6 hits directly and the ball jumps out. The partition member is a member provided in order to prevent the accident. Therefore, the position of the small diameter portion 11 and the large diameter portion in the embodiment are preferably disposed in the ink containing cylinder behind the mounting position of the ball-point pen tip 4 and as close to the front end as possible. It is set in the connecting portion 1b where the diameter portion 12 is connected.

As shown in FIG. 2, the partition member 9 has a tip portion 9b located inside the small-diameter portion 11 of the ink container 1 and a large-diameter portion 1
2, the front end 9b has a front end surface serving as a spring receiving portion 9a for supporting the rear end of the coil spring 7, and is opened at the front end surface and does not penetrate to the rear end surface 9d. 9e communicates with the rear end 9c, and at the rear end, as shown in the sectional view of FIG. 3, a lateral groove 9f formed in the radial direction communicating with the ink circulation hole 9e toward the axis, and the lateral groove 9f. A vertical groove 9g is provided to regulate the amount of ink flow that opens at the rear end face in communication with the ink. As a result, the ink 2 oscillated by the impact is buffered by the rear end face 9d of the partition member 9 , and the pressure from the opening of the ink flow passage is further buffered by the wall of the bent lateral groove 9f connected to the ink flow hole 9e. Therefore, the impact force exerted on the ball 6 was extremely weak, and the fear of the ball falling off due to the impact was eliminated.

The partition member provided in the ink container 1
9 is preferably integrally fixed to the ink container by a deformed portion 1c which is plastically deformed linearly or linearly from the outside of the ink container toward the axis at the disposition position.
As a fixing means, there is a separate method such as press-fitting, but it is important to integrally fix so as not to be positioned over time.

The ball-point pen tip 4 used in the present invention is obtained by substantially the same processing means as a normal ball-point pen tip, but is inserted into the ball house 4a as shown in the tip end manufacturing drawing of FIG. The ball 6 is supported by a ball seat 4c having a plurality of ink grooves 4g formed in the bottom of the ball house, and a caulking jig T
Is pressed against the ball and rolling is performed.
The inner wall surface 4f of the tip edge caulking portion is formed into a spherical surface having the same shape as the ball, and thereafter, the upper surface of the ball exposed from the tip edge is hammered with a hammer rod H, and the ball seat 4c is plastically deformed by a predetermined amount toward the rear end. , Manufactured so as to secure a clearance Q with the ball in the ball house.

Further, the ballpoint pen tip 4 used in the present invention
The length of the ink passage hole 4e communicating with the ball house 4a and the rear hole 4d is set to be slightly longer than a normal ball-point pen tip, and the ink groove 4g formed in the ball seat 4c is formed.
In the process of hammering the upper surface of the ball after rolling and caulking the tip edge 4b to plastically deform the ball seat,
The length of the ink passage hole is set to a predetermined length that does not affect the ink passage hole, so that the opening 4h opened by the rear hole is formed in a perfect circle (see FIG. 4). ).

In the ball-point pen refill of the present invention, the first role played by the above-mentioned ball-point pen tip 4 is that ink leakage (dripping) from the tip of the tip is carried even when the tip is carried downward or left for a long time. It can be completely prevented. In other words, the inner wall surface 4
Since f is formed on the same spherical surface as the ball 6, the ball pressed by the coil spring 7 with the movable member interposed therebetween comes into close contact with the inner wall surface of the caulked portion, thereby preventing the ink from leaking from the tip of the chip. Complete. The means for forming the inner wall surface of the tip edge caulking portion into a spherical surface of the same shape as the ball is not limited to the aforementioned manufacturing means,
The chip is suitable for medium- and low-viscosity inks having a relatively small clearance Q with the ball in the ball house 4a, and can be recommended as the simplest and most reliable manufacturing method.

The second role played by the ballpoint pen tip 4 is
This is provided by the engagement with the movable member 8 that presses the ball 6 by being interposed between the coil spring 7. In other words, as shown in FIG. 5, in a state where the ball jumps out of the ball house 4a, the ink conducting hole 4e of the ballpoint pen tip is repelled by the periphery of the opening 4h opening at the rear hole 4d and the coil spring. The contact portion 8h provided on the ball pressing portion 8a of the movable member 8 , which will be described later in detail, forms a valve mechanism that abuts each other and is closely in contact with the circumference, thereby preventing ink from flowing out from the tip of the tip. It is.

The use of the partition member 9 to prevent the ball from falling off due to the impact applied to the refill has been described in detail in paragraphs "0016" and "0017". However, there are other causes for the ball falling off, such as abrasion of the tip edge holding the ball, and the refill can be applied to a knock-type ballpoint pen that carries the chip downward using ink with low viscosity. As described above, in the connection between the ballpoint pen tip 4 and the movable member 8 as described above, a valve mechanism that does not allow ink to flow out from the tip of the tip is required. The means can be variously configured under the above conditions. One embodiment of the present invention will be described in detail below.

As shown in FIG. 5, the movable member 8 in the embodiment has an ink passage hole 4 whose tip surface abuts the ball surface.
a ball pressing portion 8a including a tip portion 8c having a diameter smaller than the diameter e;
An ink passage 8f is provided on the outer periphery thereof, and a rear end face 8e is formed by an ink rectifying portion 8b which is in contact with the coil spring 7. Further, the ball pressing portion 8a has a tip 8c having an ink rectifying portion 8b.
The connecting portion (contact portion) 8h connecting to the core 8d having a diameter larger than the diameter of the ink conducting hole is tapered, and the circumcircle of the ink rectifying portion on the outer periphery of the core is smaller than the diameter of the tip rear hole 4d. The plurality of rib-shaped blade portions 8g are formed so as to divide the circumference at equal intervals and form an ink passage 8f. In the embodiment, the ink passage is defined by the rib-shaped blades.
The present invention is not limited to this, and it is important to consider that the ink passing through the position where the coil spring is disposed smoothly flows to the tip of the tip without causing turbulence.

The movable member 8 thus formed, in conjunction with the ballpoint pen tip 4 described in paragraph [0020], constitutes a valve mechanism for preventing ink from flowing out from the tip of the tip when the ball falls off. That is, as shown in FIG. 5, when the ball 6 jumps out of the ball house 4a, the movable member 8 repelled by the coil spring 7 moves toward the tip of the chip, and the ball pressing portion 8a
A connecting portion 8h formed on a tapered surface connecting the tip portion 8c and the core portion 8d provided in the hole 4b corresponds to an opening 4h formed in a perfect circle in which the ink conducting hole 4e of the ballpoint pen tip 4 opens in the rear hole 4d. It is configured so that a valve mechanism that contacts and prevents ink from flowing out from the tip of the tip operates.

In the case where the ballpoint pen refill of the present invention having the above-described various means is accommodated in the barrel of a knock-type ballpoint pen and the ballpoint pen tip 4 is carried in a downward direction in a pocket of clothes, the ball pen refill has the same shape as the ball 6. By the action of the valve mechanism in which the ball pressed by the coil spring 7 with the movable member 8 interposed between the tip end caulking portion inner wall surface 4f formed on the spherical surface of the tip and the movable member 8 , ink leakage (dripping) from the tip end can be prevented. Further, even in the case where vibration or impact force is applied during the transportation of the product, the rear end face 9 that regulates the ink flow amount of the partition member 9 by the impact pressure caused by the swing of the ink 2.
By forming an ink flow path consisting of d, horizontal groove 9f and vertical groove 9g, the pressure applied to the ball is kept to a very small pressure to eliminate the possibility of the ball falling off. Furthermore, the ball is held in contact with the paper surface by writing. In the case where the leading edge 4b of the ball is worn out and the ball falls out while the ink remains, the ink passage hole opening 4h of the ballpoint pen tip and the ball pressing portion 8 of the movable member pressed by the coil spring.
The valve mechanism which abuts on the connecting portion (contact portion) 8h provided at the point (a) acts to prevent the ink from flowing out from the tip of the tip.
Of course, the refill becomes unusable due to the ball falling off, but it avoids the worst case of soiling clothes with ink, thereby confirming that it is a ballpoint pen refill that can be used safely with knock type ballpoint pens Is obtained.

[0027]

According to the present invention, when the ink is provided with a shear thinning property, the ink has a high viscosity in a static state, and therefore does not require a member such as an ink occluding body, a relay core or a pen core member having an ink discharge adjusting function. The ink can be filled directly into the ink container, and the viscosity of the ink is instantaneously reduced by the rotation of the ball during writing, so there is an advantage that a clear handwriting can be obtained with a smooth writing feel, and the ink from the tip of the tip A cap-type ballpoint pen with a sealing member (using an elastic member such as silicone rubber) that seals the tip of the chip inside the cap to fix the defect of ball dropping due to leakage or impact was first commercialized. Although the present invention has been well received, the present invention uses the ink having shear-thinning properties, the tip of the chip is not sealed with a sealing member, the tip is held in a downward state, Line and moreover, attempts to emerge ballpoint pen refill which can be stored in knock-type ballpoint pen which infested actuating from the tip end of the barrel a writing unit, in which a successful this take various means previously follow.

The ballpoint pen using an ink having a shear thinning property has a very good market evaluation as described above, and a knocking type in which a writing part can be moved in and out by a knocking operation using the ink after solving a difficult problem. The effect of the present invention completed in a ballpoint pen refill that can also be applied to a ballpoint pen,
In terms of performance, there is no difference from the previously commercialized cap type, and if this is used for the knock type, it will be released from the hassle of taking and fitting the cap, and furthermore, functionality and convenience will be added With this, the effect of developing a new product can be immense. In addition, since the ink container is made of a metal material, the required amount of ink can be stored, and the fine outer diameter can be obtained. It is possible to bring about effects such as being able to bring about.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a ballpoint pen refill according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of only a tip used for explaining a ballpoint pen refill according to an embodiment of the present invention.

FIG. 3A is used to describe an ink flow passage of a partition member.
FIG.

FIG. 4 is a process diagram in which only a tip portion of the ball-point pen tip is cut out in vertical section to exemplify a manufacturing method used for describing the tip.

FIG. 5 is an explanatory view showing a valve mechanism for preventing ink from flowing out when a ball falls off, in which only a tip end portion of one embodiment is partially cut away in vertical section.

FIG. 6 is a longitudinal sectional view showing a conventional ballpoint pen refill.

[Description of Signs] 1 Ink storage cylinder 1a Tip hole 1b Connecting portion 1c Deformation portion 11 Small diameter portion 12 Large diameter portion 2 Ink 3 Ink follower 4 Ballpoint pen tip 4a Ball house 4b Tip edge 4c Ball seat 4d Rear hole 4e Ink communication hole 4f Inner wall surface of caulking part 4h Opening part 5 Tail plug 6 Ball 7 Coil spring 8 Moving member 8a Ball pressing part 8b Ink rectifying part 8c Tip part 8e Rear end face 8f Ink passage 8h Connecting part (contact part) 9 Partition member 9a Spring receiving part (tip) Surface) 9d rear end surface 9e ink flow hole 9f horizontal groove 9g vertical groove H hammer rod Q clearance T caulking jig

Claims (6)

[Claims] An ink container having a small-diameter portion opening at the leading end and a large-diameter portion opening at the rear end has a high viscosity in a static state, but the viscosity is reduced by rotation of a ball during writing. A viscous ink and an ink follower that follows ink consumption and prevents ink backflow are stored at the rear of the ink, and a ballpoint pen tip is fitted into the tip end hole of the small diameter portion and the ball is held. A ball-point pen having a coil spring that constantly presses the ball directly or via a movable member disposed on the inner wall surface of the caulking portion at the leading edge, and a tail plug provided with ventilation means fitted at the rear end of the large-diameter portion. in refill, the ink accommodating tube (1) is thereby formed of a metal material, the spring receiving portion (9a for supporting the rear end of the coil spring to the distal end surface having an ink flow path through the axial direction (7) And forms and, the rear end face of the opening portion of the ink flow passage for restricting the ink flow amount (9d) partition member (9) formed as a small diameter portion ballpoint pen tip of the ink reservoir tube (4) is fitted ( 11. A ball-point pen refill, which is disposed in a connecting portion (1b) of a large-diameter portion (12) for storing an ink (2) and an ink (2). 2. A caulking jig (T) is pressed against a tip edge (4b) of the ball-point pen tip ( 4 ) with the ball (6) positioned in the ball house (4a), and a caulked portion is formed on the ball. The inner wall surface (4f) of the caulked portion is formed into a spherical surface having the same shape as the ball by rolling and caulking by pressing, and thereafter, the upper surface of the ball exposed from the leading edge is hammered with a hammer rod (H) to place the ball seat (4c). Plastic clearance is performed in the direction of the rear end of the fixed amount to secure clearance (Q) with the ball in the ball house, and the rear hole (4d)
2. An ink passage hole (4e) penetrating through the hole at a predetermined length in the axial direction is formed so that an opening (4h) with the rear hole is kept in a perfect circle. Ballpoint pen refill. 3. An ink flow passage (9e) which opens the ink flow passage of the partition member ( 9 ) at the front end surface (9a) but does not reach the rear end surface (9d), and a radial direction passing through the ink flow hole. The ball-point pen refill according to claim 1, wherein the ball-point pen refill is formed by a transverse groove (9f) drilled toward the axis and a longitudinal groove (9g) extending in the axial direction communicating with the transverse groove and the rear end face. 4. A partition member ( 9 ) located at a connecting portion (1b) between a small diameter portion (11) and a large diameter portion (12) of the ink storage cylinder ( 1 ). The ballpoint pen refill according to claim 1, wherein the partition member is integrally fixed by a deformed portion (1c) that is plastically deformed in a point or linear direction. 5. An opening ( 4 ) in which the ink conduction hole (4e) of the ball-point pen tip ( 4 ) is opened at the rear hole (4d) when the ball (6) is projected outward from the ball house (4a). 4h) A valve mechanism is formed in which the periphery and the contact portion (8h) provided on the ball pressing portion (8a) of the movable member ( 8 ) repelled by the coil spring (7) abut each other and come into close contact with the circumference. The ballpoint pen refill according to claim 1, wherein 6. An ink passage hole (4e) having a tip end surface in contact with a ball (6) surface of the ballpoint pen tip ( 4 ).
The ball pressing portion (8) including the tip portion (8c) having a diameter smaller than the diameter.
and a), there the ball pressing part of the rear end face provided an ink passage (8f) on its outer periphery (ink rectifier contacting the 8e) to the coil spring (7) (8b) the de-formed the movable member (8) The connecting portion (8) whose leading end is connected to the core portion (8d) having a diameter larger than the diameter of the ink conducting hole toward the ink rectifying portion.
3. The method according to claim 2, wherein h) is formed on a tapered surface.
And a ballpoint pen refill according to 5.