JP4318256B2 - Ballpoint pen refill - Google Patents

Description

  The present invention relates to a ball-point pen refill, and more particularly, to a ball-point pen refill that can maintain comfortable writing by preventing fiber waste from entering the ball house while preventing ink leakage.

The ballpoint pen refill usually has a tip for applying ink to the paper surface at the tip.
6 and 7 show an example of the tip 20 provided in the conventional ballpoint pen refill 10. The chip 20 includes a ball 50 and a holder 60 for holding the ball 50. The holder 60 includes a ball house 61, an ink guide hole 62, an ink groove 63, and a caulking portion 64. The ball house 61 is for storing the ball 50, and is provided near the tip of the holder 60. The ball house 61 includes a cylindrical side surface portion 70 and a conical bottom surface portion 71. . Further, a portion of the bottom surface portion 71 with which the rear end side of the ball 50 abuts is a ball receiving seat 72. The ink guide hole 62 is for supplying ink to the ball 50 housed in the ball house 61 and penetrates from the rear end of the holder 60 to the ball house 61. Further, the ink groove 63 is provided so that the ink is sufficiently supplied to the ball 50 housed in the ball house 61, and is formed on the inner peripheral surface of the ink guide hole 62 from the center of the ink guide hole 62. It is provided radially to see. Further, the caulking portion 64 is for preventing the ball 50 stored in the ball house 61 from jumping out, and is provided at the tip of the holder 60. Further, a minute gap called a clearance 65 is provided between the surface of the ball 50 and the inner peripheral surface 64a of the caulking portion 64, and this clearance 65 serves as an ink passage during writing.

Here, a plane perpendicular to the long axis 20a of the chip 20 and passing through the center 50a of the ball 50 is defined as a ball center plane P, and a plane passing through the rear end 64b of the inner peripheral surface 64a of the caulking portion 64 is The rear end face Q of the inner periphery of the caulking portion.
In the chip 20 shown in FIGS. 6 and 7, the inner peripheral rear end face Q of the crimping portion is located on the front end side with respect to the ball center plane P. In this way, if the rear end surface Q of the inner periphery of the crimping portion is positioned on the front end side of the ball center plane P, the intermediate position before and after the ball 50 cannot be pressed, so that the lateral play of the ball 50 in the ball house 61 is prevented. Is relatively large. Then, as shown in FIG. 7, when the long axis 20a of the chip 20 is tilted with respect to the paper surface 110, the ball 50 is pushed and moved to the opposite side of the paper surface 110. In the vicinity of the A1 portion, the clearance 65 is relatively small, and in the vicinity of the B1 portion in FIG. 7, the clearance 65 is relatively large. For this reason, when writing is made in the X1 direction in FIG. 7 and the ball 50 is rotated in the Y1 direction in FIG. 7, fiber scraps adhering to the surface of the ball 50 are removed from the clearance 65 near the A1 portion in FIG. It becomes difficult to get caught in the ball house 61, and the fiber waste caught in the ball house 61 is likely to be discharged out of the ball house 61 together with ink from the clearance 65 in the vicinity of the B1 portion in FIG. Such a chip 20 is disclosed in Patent Document 1 below.

As described above, when the caulking portion inner peripheral rear end face Q is positioned on the front end side of the ball center plane P, the fiber debris adhering to the surface of the ball 50 becomes difficult to be caught in the ball house 61 and is caught in the ball house 61. Although it is easy to discharge the waste fiber scraps out of the ball house 61, on the other hand, a large amount of ink comes out from the clearance 65 in the vicinity of the B1 portion in FIG. The so-called “ink spill” is easily generated.
FIGS. 8 and 9 also show an example of the chip 20 provided in the conventional ballpoint pen refill 10. In this chip 20, the inner peripheral rear end face Q of the crimping portion is located on the rear end side with respect to the ball center plane P. As described above, if the rear end surface Q of the inner periphery of the crimping portion is positioned on the rear end side with respect to the ball center plane P, the intermediate position before and after the ball 50 is pressed, so that the play of the ball 50 in the ball house 61 is relatively small. As a result, the position of the ball 50 in the ball house 61 becomes relatively stable. As a result, as shown in FIG. 9, even when the long axis 20a of the chip 20 is tilted with respect to the paper surface 110, the amount of ink discharged from the clearance 65 is stabilized, and ink spilling is less likely to occur. Such a chip 20 is also disclosed in Patent Document 1 below.

  As described above, when the rear end face Q of the inner periphery of the crimping portion is positioned on the rear end side of the ball center plane P, the position of the ball 50 in the ball house 61 is relatively stable, and the amount of ink discharged from the clearance 65 is stable. As a result, it becomes difficult for ink to be generated, but on the other hand, it becomes easier for the fiber waste adhering to the surface of the ball 50 to be caught in the ball house 61 and the fiber waste caught in the ball house 61 is removed from the ball house 61. 61 It will be difficult to spit out. That is, in comparison with the chip 20 shown in FIGS. 6 and 7, even if the chip shown in FIGS. 8 and 9 is tilted with respect to the paper surface 110 as shown in FIG. The clearance 65 is not so small, and the clearance 65 near the portion B2 in FIG. 9 is not so large. For this reason, when writing is made in the X2 direction in FIG. 9 and the ball 50 is rotated in the Y2 direction in FIG. 9, the fiber waste adhering to the surface of the ball 50 is removed from the clearance 65 near the A2 portion in FIG. It becomes relatively easy to be caught in the ball house 61, and the fiber waste caught in the ball house 61 is relatively difficult to be discharged out of the ball house 61 from the clearance 65 near the B1 portion in FIG. .

Although not shown, the following Patent Document 2 includes an ink storage tube and a tip fixed to the tip of the ink storage tube, and the tip side of the ink storage tube is filled with ink. A so-called pressurized ballpoint pen refill is disclosed in which pressurized gas is filled on the rear end side and ink is pushed out in the chip direction by the pressure of the pressurized gas.
In such a pressurized ballpoint pen refill, since the pressurized gas always presses the ink in the tip direction, writing can be performed even with the tip facing upward.
JP 2000-37985 A JP 2002-205483 A

As described above, when the rear end surface of the inner periphery of the crimping portion is positioned on the tip side from the center surface of the ball, the play of the ball in the ball house becomes relatively large, and the fiber waste adhering to the surface of the ball is caught in the ball house. Although it becomes difficult and it becomes easy to discharge the fiber scraps which have been caught in the ball house to the outside of the ball house, on the other hand, too much ink comes out from the clearance, so that it becomes easy to cause ink waste.
On the other hand, when the rear end surface of the inner periphery of the crimping portion is positioned on the rear end side from the center surface of the ball, the position of the ball in the ball house is relatively stable, the amount of ink discharged from the clearance is stable, and the ink swells. Although it is difficult to generate, the fiber waste adhering to the surface of the ball is easily caught in the ball house, and the fiber waste caught in the ball house is difficult to be discharged out of the ball house.

In a pressurized ballpoint pen refill, if the ball play in the ball house is relatively large and the clearance is relatively large, ink may leak out of the clearance due to the pressure of the pressurized gas, On the other hand, if the ball play in the ball house is relatively small and the clearance is relatively small, the pressurized gas will press the ink in the direction of the chip, but the ink will be blurred. It tends to occur.
For this reason, particularly in the pressurized ballpoint pen refill, while preventing the occurrence of ink voids, it is difficult for fiber scraps adhering to the surface of the ball to be caught in the ball house, and the fibers that have been caught in the ball house It is very difficult to maintain a comfortable writing by making it easy to spit out the ball house.

Therefore, the present invention has prevented the occurrence of ink spilling in the pressure-type ballpoint pen refill, making it difficult for fiber debris adhering to the surface of the ball to be caught in the ball house and being caught in the ball house. It is a first object to make it easy to discharge fiber waste out of the ball house and maintain comfortable writing.
Further, the present invention prevents ink from blurring while preventing leakage of ink from the clearance and ball from the ball house, and further allows the ink to be used up to the end. This is the second problem.

(1) First Invention As a result of intensive studies to solve the first problem, the present inventor has determined that the caulking portion inner peripheral rear end face Q is the ball center plane P in the pressure-type ballpoint pen refill 10. If they match or are positioned within a predetermined range on the rear end side of the ball center plane P, the occurrence of the ink 80 swarf is suppressed, and the fiber waste adhering to the surface of the ball 50 is put into the ball house 61. It has become difficult to be caught up, and the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, and it has been found that comfortable writing can be maintained, and the following invention has been completed.
That is, the first invention of the present invention includes an ink containing tube 30 and a tip 20 fixed to the tip of the ink containing tube 30, and the ink 80 is filled on the tip side of the ink containing tube 30. The rear end side of the storage tube 30 is filled with a pressurized gas 90, and the ball pen refill 10 is configured to push the ink 80 in the direction of the chip 20 by the pressure of the pressurized gas 90. And a holder 60 for holding the ball 50, a ball house 61 for storing the ball 50 is provided near the tip of the holder 60, and the ball house 61 is stored at the tip of the holder 60. A caulking portion 64 is provided to prevent the ball 50 from jumping out of the ball house 61. A plane perpendicular to the long axis 20a of the chip 20 and passing through the center 50a of the ball 50 is defined as a ball center plane P, and the caulking portion 64 The plane passing through the rear end 64b of the inner peripheral surface 64a of the When the inner periphery rear end face Q is used as the crimping portion inner peripheral rear end face Q, the inner periphery rear end face Q coincides with the ball central plane P or is located on the rear end side with respect to the ball central plane P, and within the ball central plane P and the caulking portion. When the distance from the rear end face Q is L and the diameter of the ball is R, (L / R) ≦ 0.036 is satisfied.

Here, “the ink storage tube 30 and the tip 20 fixed to the front end of the ink storage tube 30 are provided. The front end side of the ink storage tube 30 is filled with ink 80, and the rear end side of the ink storage tube 30 is Is a so-called pressurized ball-point pen refill 10 that is filled with the pressurized gas 90 and pushes the ink 80 toward the tip 20 by the pressure of the pressurized gas 90.
The “ink storage tube 30” is for storing the ink 80.
The ink storage tube 30 can be formed in a cylindrical shape, for example.
Further, the ink containing tube 30 can be integrally formed by pressing using a metal material such as stainless steel or brass, or can be integrally formed by extrusion molding or injection molding using a plastic material. It can also be formed.

In addition, the ink storage tube 30 is not limited to being integrally formed, and includes, for example, an ink storage portion for storing the ink 80 and a joint portion for connecting the ink storage portion and the chip 20. It can also be formed by forming them separately and connecting them together.
The “chip 20” includes a ball 50 and a holder 60 for holding the ball 50.
The chip 20 is fixed to the tip of the ink storage tube 30. The chip 20 can be fixed to the ink storage tube 30 by, for example, press-fitting the vicinity of the rear end of the chip 20 into the vicinity of the front end of the ink storage tube 30, and the rear end of the chip 20 By forming a male screw in the vicinity, forming a female screw near the tip of the ink containing tube 30, and screwing the male screw near the rear end of the chip 20 to the female screw near the tip of the ink containing tube 30 It can also be done.

The “ball 50” is for applying the ink 80 to the paper surface.
The ball 50 can be formed using, for example, cemented carbide, stainless steel, hardened steel, or ceramic.
The “holder 60” is for holding the ball 50.
The holder 60 can be formed using a wire material such as stainless steel, white, brass, or brass.
The holder 60 includes a ball house 61 and a caulking portion 64.
The “ball house 61” is for housing the ball 50 and is provided near the tip of the holder 60.

The “crimping portion 64” is for preventing the ball 50 stored in the ball house 61 from jumping out of the ball house 61, and is provided at the tip of the holder 60.
The “long axis 20a of the chip 20” refers to an axis passing through the center of the chip 20 in the longitudinal direction. The major axis 20a of the chip 20 is a virtual axis, and the chip 20 does not actually have such an axis.
The “ball center plane P” refers to a plane orthogonal to the long axis 20 a of the chip 20 and passing through the center 50 a of the ball 50. The ball center plane P is a virtual plane, and the chip 20 does not actually have such a plane.

The “crimped portion inner peripheral rear end surface Q” refers to a plane passing through the rear end 64b of the inner peripheral surface 64a of the crimped portion 64. The caulking portion inner peripheral rear end face Q is a virtual plane, and the chip 20 does not actually have such a plane. Further, since the holder 60 is formed in a cylindrical shape, the rear end 64b of the inner peripheral surface 64a of the crimping portion 64 is located on the same plane that is equidistant from the long axis 20a of the chip 20. Therefore, the caulking portion inner peripheral rear end surface Q is orthogonal to the major axis 20a of the chip 20, and the ball center surface P and the caulking portion inner peripheral rear end surface Q are parallel to each other.
Further, in the ballpoint pen refill 10 according to the present invention, the inner peripheral rear end surface Q of the caulking portion is coincident with the ball center plane P or positioned on the rear end side with respect to the ball center plane P. For this reason, in the ball-point pen refill 10 according to the present invention, an intermediate position before and after the ball 10 is pressed.

Furthermore, in the ballpoint pen refill 10 according to the present invention, when the distance between the ball center plane P and the caulking portion inner peripheral rear end surface Q is L and the diameter of the ball is R,
(L / R) ≦ 0.036
Meet.
As described above, the ball center plane P and the caulking portion inner peripheral rear end surface Q are parallel to each other. Therefore, it is possible to draw a straight line that is orthogonal to both the ball center plane P and the caulking inner peripheral rear end face Q. The length from the straight ball center plane P to the caulking inner peripheral rear end surface Q is a distance L between the ball central surface P and the caulking inner peripheral rear end surface Q.

In the ballpoint pen refill 10 according to the present invention, the caulking portion inner circumferential rear end surface Q is made to coincide with the ball center surface P or within a predetermined range on the rear end side from the ball center surface P ((L / R) ≦ 0). .. within the range satisfying .036), it prevents the waste of the ink 80 from being generated, makes it difficult for the fiber debris adhering to the surface of the ball 50 to be caught in the ball house 61, and in the ball house 61. It makes it easy to spit out the fiber waste that has been caught out of the ball house 61 so that comfortable writing can be maintained.
If the inner circumferential rear end face Q of the caulking portion is positioned on the tip side of the ball center plane P, the play of the ball 50 in the ball house 61 becomes too large, and the ink 80 is excessively discharged from the clearance 65. 80 spots are likely to occur.

On the other hand, when the inner circumferential rear end face Q of the crimped portion is positioned outside a predetermined range (0.036 <(L / R)) on the rear end side of the ball center plane P, the play of the ball 50 in the ball house 61 is small. The ball 50 becomes too stable in the ball house 61, and the fiber waste adhering to the surface of the ball 50 tends to be entangled into the ball house 61, and the fiber waste caught in the ball house 61 It becomes difficult to spit out of the ball house 61.
(2) Second invention Further, as a result of intensive studies to solve the second problem, the present inventors have determined that the pressure of the pressurized gas 90 is within a predetermined range in the pressurized ballpoint pen refill 10. When set, it can prevent ink 80 from leaking from the clearance 65 and the ball 50 from the ball house 61, while preventing the ink 80 from fading. In addition, the ink 80 can be used up to the end. The headline and the following invention were completed.

That is, in the second invention of the present invention, in addition to the features of the first invention, the pressurized gas 90 has a pressure at the time of assembling the ballpoint refill 10 of 0.15 MPa to 0.4 MPa in absolute pressure. It is characterized by that.
As described above, the ballpoint pen refill 10 according to the present invention is configured so that the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 is 0.15 MPa or more and 0.4 MPa or less in terms of absolute atmospheric pressure. While preventing leakage and jumping out of the ball 50 from the ball house 61, the ink 80 is prevented from being blurred, and the ink 80 is used up to the end.

If the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 is less than 0.15 MPa in absolute pressure, the ink 80 may be blurred, and the ink 80 may not be used up to the end. There is.
On the other hand, when the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 exceeds 0.4 MPa in absolute pressure, the ink 80 may leak from the clearance 65 or the ball 50 may jump out of the ball house 61. .
Of course, even when the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 is out of the above range, it can be used.

(1) Effects of the First Invention According to the first invention, the inner peripheral rear end surface of the crimping portion is coincident with the ball center surface or within a predetermined range on the rear end side from the ball center surface ((L / R ) ≦ 0.036. For this reason, the play of the ball in the ball house is within a predetermined range, and the size of the clearance when the long axis of the chip is tilted with respect to the paper surface is also within the predetermined range. In addition, the fiber waste attached to the surface of the ball is not easily caught in the ball house, and the fiber waste caught in the ball house is easily discharged out of the ball house. Therefore, comfortable writing can be maintained.

(2) Effects of the Second Invention According to the second invention, the pressure of the pressurized gas when the ballpoint pen refill is assembled is within a predetermined range (0.15 MPa or more and 0.4 MPa or less in absolute atmospheric pressure). For this reason, the pressure in the chip direction applied to the ink is within a predetermined range, so that the ink leakage from the clearance is suppressed, the ball is prevented from jumping out of the ball house, and the ink is blurred. In addition, the ink can be used up to the end.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 is a side sectional view of a ballpoint pen refill 10 according to the present embodiment, FIG. 2 is an enlarged view of a portion A in FIG. 1, FIG. 3 is an enlarged view of a portion B in FIG. FIG. 5 is a perspective view of the float 100. FIG.
The ballpoint pen refill 10 according to the present embodiment includes an ink storage tube 30 and a tip 20 fixed to the tip of the ink storage tube 30. The ink storage tube 30 is formed in a substantially cylindrical shape, and a tail plug 40 is press-fitted at the rear end thereof. Further, the ink storage tube 30 is filled with ink 80 at the front end side, and the pressurized gas 90 is filled at the rear end side of the ink storage tube 30. In addition, a float 100 that moves within a certain range as the ink 80 decreases is provided inside the ink storage tube 30 and between the ink 80 and the pressurized gas 90. The ink 80 is pushed out toward the tip 20 by the pressure of the pressurized gas 90.

Hereinafter, the ballpoint pen feel 10 according to the present embodiment will be described in detail.
(Chip 20)
The chip 20 includes a ball 50 and a holder 60 for holding the ball 50.
(Ball 50)
The ball 50 is for applying the ink 80 to the paper surface.
The ball 50 is formed using cemented carbide, stainless steel, hardened steel, ceramic, or the like.
(Holder 60)
The holder 60 is for holding the ball 50.

Moreover, the holder 60 is formed using a metal wire such as stainless steel, white, brass, or brass.
The holder 60 includes a ball house 61, an ink guide hole 62, an ink groove 63, and a caulking portion 64.
The holder 60 has a conical tapered portion 66 that gradually increases in outer diameter from the front end side toward the rear end side, and a cylindrical body portion 67 that is continuously provided on the rear end side of the tapered portion 66, A cylindrical fixed portion 68 having a diameter smaller than that of the body portion 67, which is provided continuously on the rear end side of the body portion 67, and a stepped outward step provided between the body portion 67 and the fixed portion 68. Part 69.

Hereinafter, each part of the holder 60 will be described in detail.
(Ballhouse 61)
The ball house 61 is for storing the ball 50 and is provided near the tip of the holder 60.
The ball house 61 includes a cylindrical side surface portion 70 and a conical bottom surface portion 71 that gradually decreases in inner diameter toward the ink guide hole 62 side.
Further, the ball house 61 is formed by cutting from the front end side to the rear end side of the wire with a drill whose rotational axis is aligned with the axis of the wire.

Further, the bottom surface portion 71 has a concave spherical ball receiving seat 72 having a curvature substantially the same as the curvature of the ball 50 around the opening portion of the ink guide hole 62.
The ball receiving seat 72 is formed by pressing the ball 50 toward the ink guide hole 62 with a hammer after the ball 50 is stored in the ball house 61.
(Ink guide hole 62)
The ink guide hole 62 is for supplying the ink 80 to the ball 50 accommodated in the ball house 61, and penetrates from the rear end of the holder 60 to the ball house 61.
Further, the ink guide hole 62 is formed by cutting from the rear end of the wire to the ball house 61 side with a drill whose rotational axis coincides with the axis of the wire.

(Ink groove 63)
The ink groove 63 is for ensuring that the ink 80 is sufficiently supplied to the ball 50 housed in the ball house 61.
Further, the ink grooves 63 are provided radially on the inner peripheral surface of the ink guide hole 62 on the ball house 61 side as viewed from the center of the ink guide hole 62.
Further, the ink groove 63 is formed by performing broaching from the ball house 61 side to the rear end side of the wire.
(Caulking section 64)
The caulking portion 64 is for preventing the ball 50 stored in the ball house 61 from jumping out of the ball house 61, and is provided at the tip of the holder 60.

Further, the caulking portion 64 is formed in a conical shape, and the inner diameter of the minimum diameter portion is formed smaller than the diameter of the ball 50.
The caulking portion 64 is formed by rolling the tip of the wire rod from the outside after the ball 50 is stored in the ball house 61.
The caulking portion 64 holds the ball 50 rotatably at the tip of the holder 60 while a part of the ball 50 protrudes from the ball house 61.
Further, a minute gap called a clearance 65 is provided between the ball 50 and the caulking portion 64, and this clearance 65 is a passage for the ink 80 at the time of writing.

As the ball 50 rotates, the ink 80 attached to the surface of the ball 50 is transferred to the paper surface, thereby drawing a drawn line on the paper surface.
Here, a plane perpendicular to the long axis 20a of the chip 20 and passing through the center 50a of the ball 50 is defined as a ball center plane P.
A plane passing through the rear end 64b of the inner peripheral surface 64a of the crimping portion 64 is defined as an inner peripheral rear end surface Q of the crimping portion 64.
Further, the long axis 20a of the chip 20 refers to an axis passing through the center of the chip 20 in the longitudinal direction. The major axis 20a of the chip 20 is a virtual axis, and the chip 20 does not actually have such an axis.

The ball center plane P is a plane orthogonal to the major axis 20a of the chip 20 and passing through the center 50a of the ball 50. The ball center plane P is a virtual plane, and the chip 20 does not actually have such a plane.
Further, the caulking portion inner peripheral rear end surface Q refers to a plane passing through the rear end 64b of the inner peripheral surface 64a of the caulking portion 64. The caulking portion inner peripheral rear end face Q is a virtual plane, and the chip 20 does not actually have such a plane.
Further, since the holder 60 is formed in a cylindrical shape, the rear end 64b of the inner peripheral surface 64a of the crimping portion 64 is located on the same plane that is equidistant from the long axis 20a of the chip 20. Therefore, the caulking portion inner peripheral rear end surface Q is orthogonal to the major axis 20a of the chip 20, and the ball center surface P and the caulking portion inner peripheral rear end surface Q are parallel to each other. For this reason, a straight line perpendicular to both the ball center plane P and the caulking portion inner peripheral rear end surface Q can be drawn, and the length of the straight line from the ball central surface P to the caulking portion inner peripheral rear end surface Q is the ball central plane P. And a distance L between the inner circumferential rear end face Q of the crimped portion.

Further, in the ballpoint pen refill 10 according to the present embodiment, the caulking portion inner peripheral rear end surface Q coincides with the ball center plane P or is positioned on the rear end side with respect to the ball center plane P. For this reason, in the ball-point pen refill 10 according to the present invention, an intermediate position before and after the ball 10 is pressed.
Further, in the ballpoint pen refill 10 according to the present embodiment, when the distance between the ball center plane P and the caulking portion inner peripheral rear end surface Q is L and the diameter of the ball is R,
(L / R) ≦ 0.036
Meet.

That is, in the ball-point pen refill 10 according to the present embodiment, the caulking portion inner peripheral rear end surface Q coincides with the ball center surface P or within a predetermined range on the rear end side from the ball center surface P ((L / R)) The crimping portion 64 is formed by rolling the tip of the wire rod from the outside so as to be positioned within a range satisfying ≦ 0.036).
Then, the ballpoint pen refill 10 according to the present embodiment has the caulking portion inner peripheral rear end face Q coincide with the ball center plane P or within a predetermined range on the rear end side from the ball center plane P ((L / R)) ≦ 0.036), the clearance of the ball 50 in the ball house 61 is kept within a predetermined range and the long axis 20a of the chip 20 is inclined with respect to the paper surface. The size of the ink is kept within a predetermined range to prevent the occurrence of the ink 80 burrs, while making it difficult for the fiber debris adhering to the surface of the ball 50 to be caught in the ball house 61 and in the ball house 61. It makes it easy to spit out the fiber scraps out of the ball house 61 so that a comfortable writing can be maintained.

If the inner circumferential rear end face Q of the caulking portion is positioned on the tip side of the ball center plane P, the play of the ball 50 in the ball house 61 becomes too large, and the ink 80 is excessively discharged from the clearance 65. 80 spots are likely to occur.
On the other hand, when the inner circumferential rear end face Q of the crimped portion is positioned outside a predetermined range (0.036 <(L / R)) on the rear end side of the ball center plane P, the play of the ball 50 in the ball house 61 is small. The ball 50 becomes too stable in the ball house 61, and the fiber waste adhering to the surface of the ball 50 tends to be entangled into the ball house 61, and the fiber waste caught in the ball house 61 It becomes difficult to spit out of the ball house 61.

(Ink storage tube 30)
The ink storage tube 30 is formed in a substantially cylindrical shape. Further, the tip 20 is fixed to the tip of the ink storage tube 30, and the tail plug 40 is press-fitted to the rear end of the ink storage tube 30. Further, the ink storage tube 30 is filled with ink 80 at the front end side, and the pressurized gas 90 is filled at the rear end side of the ink storage tube 30. In addition, a float 100 that moves within a certain range as the ink 80 decreases is provided inside the ink storage tube 30 and between the ink 80 and the pressurized gas 90.
Specifically, the ink containing tube 30 is integrally formed by pressing using a metal material such as stainless steel or brass.

The ink storage tube 30 includes a cylindrical large-diameter portion 31, a cylindrical medium-diameter portion 32 having a diameter smaller than that of the large-diameter portion 31 connected to the distal end side of the large-diameter portion 31, A cylindrical small-diameter portion 33 having a diameter smaller than that of the medium-diameter portion 32 and connected to the distal end side of the diameter portion 32 is provided.
Further, the ink containing tube 30 is a conical portion provided between the large-diameter portion 31 and the medium-diameter portion 32 and provided between the step-shaped inward step portion 34 and the medium-diameter portion 32 and the small-diameter portion 33. And a throttle portion 35 having a shape.
The large diameter portion 31 is a portion for filling the pressurized gas 90 and the ink 80.
That is, the rear end side of the large diameter portion 31 is filled with the pressurized gas 90, and the leading end side of the large diameter portion 31 is filled with the ink 80 from the medium diameter portion 32 to the small diameter portion 33. Has been.

Further, in the vicinity of the end portion on the rear end side of the large-diameter portion 31, a tail plug 40 is press-fitted to prevent the pressurized gas 90 filled in the large-diameter portion 31 from leaking to the outside.
In addition, a diameter-reduced portion is formed after the tail plug 40 is press-fitted into the end portion on the rear end side of the large-diameter portion 31, and the tail plug 40 that is press-fitted into the large-diameter portion 31 is compressed by the reduced-diameter portion. The pressure of 90 prevents it from jumping out.
A float 100 that moves as the ink 80 decreases is provided inside the large-diameter portion 31 and between the ink 80 and the pressurized gas 90. The float 100 prevents the ink 80 filled on the distal end side of the large diameter portion 31 from flowing backward.

That is, since the inner diameter of the large-diameter portion 31 is formed to be relatively large, the capillary force is difficult to work inside the large-diameter portion 31. For this reason, the ink 80 filled in the large diameter portion 31 tends to flow out in the direction opposite to the tip 20. Therefore, by providing the float 100 formed in a substantially cylindrical shape inside the large diameter portion 31 and between the ink 80 and the pressurized gas 90, the ink 80 filled in the large diameter portion 31 is moved backward. I try not to flow out. Further, the float 100 moves in the tip direction as the ink 80 decreases, and moves in the tip direction when contacting the inward stepped portion 34 provided between the large diameter portion 31 and the medium diameter portion 32. Stop.
The inward stepped portion 34 is a portion for connecting the large diameter portion 31 and the medium diameter portion 32 and is formed in a step shape.

The medium diameter portion 32 is a portion for filling the ink 80 and is formed in a cylindrical shape having a smaller diameter than the large diameter portion 31.
In addition, since the inner diameter portion 32 is formed to have a relatively small inner diameter, the capillary force tends to work inside the middle diameter portion 32. For this reason, in the inside of the medium diameter portion 32, even if the float 100 is not provided between the pressurized gas 90 and the ink 80, the ink 80 is difficult to flow backward.
The throttle part 35 is a part for connecting the medium diameter part 32 and the small diameter part 33, and is formed in a conical shape.
The small diameter portion 33 is a portion for fixing the chip 20, and is formed in a cylindrical shape having a smaller diameter than the medium diameter portion 32.

Further, the small diameter portion 33 is formed so that its inner diameter is slightly smaller than the outer diameter of the fixing portion 68 of the holder 60.
Then, the chip 20 is fixed to the tip of the ink containing tube 30 by press-fitting the fixing portion 68 of the holder 60 into the small diameter portion 33.
Further, when the fixing portion 68 of the holder 60 is press-fitted into the small diameter portion 33, the tip of the small diameter portion 33 and the outward stepped portion 69 of the holder 60 are prevented from coming into contact with each other, thereby deforming the small diameter portion 33. To prevent airtightness.
The small-diameter portion 33 is annealed before the fixing portion 68 of the holder 60 is press-fitted, thereby preventing stress corrosion cracking caused by press-fitting the fixing portion 68 of the holder 60.

The ink containing tube 30 is formed of a material that does not deform, crack (break), swell or react with the ink 80, and is excellent in airtightness or pressure resistance. Therefore, the present invention is not limited to the case where it is integrally formed by pressing using a metal material such as stainless steel or brass.
Specifically, for example, the ink storage tube 30 may be formed by extrusion molding or injection molding using a plastic material.
Further, the ink containing tube 30 is not limited to being formed integrally.
Specifically, for example, an ink storage section for storing the ink 80 and a joint section for connecting the ink storage section and the chip 20 are separately formed, and these are joined together to form an ink storage tube. 30 may be formed.

(Ink 80)
The ink 80 is prepared by appropriately blending a colorant, a solvent, a structural viscosity imparting agent, a resin, an additive, and the like.
(Coloring agent)
As the colorant, it is possible to use many of dyes or pigments that have been conventionally used for oil-based ballpoint pen inks.
Specifically, for example, Bali First Color (trade name, manufactured by Orient Chemical Industry Co., Ltd.), Nigrosine EX (trade name, manufactured by Orient Chemical Industry Co., Ltd.), Eisenspiron dye, Eisen SOT dye (trade name, Hodogaya) Chemical Industry Co., Ltd.), Spiron Violet C-RH (trade name, manufactured by Hodogaya Chemical Co., Ltd.), Spiron Yellow C-2GH (trade name, manufactured by Hodogaya Chemical Co., Ltd.) Can be used as

Further, for example, inorganic pigments such as titanium oxide, carbon black, carbon black MA-100 (trade name, manufactured by Mitsubishi Chemical Corporation), metal powder, and the like can be used as the colorant.
Further, for example, organic pigments such as azo lakes, insoluble azo pigments, chelate azo pigments, phthalocyanine pigments, perylene pigments, anthraquinone pigments, quinacridone pigments, dye lakes, nitro pigments, nitroso pigments can also be used as colorants.
In addition, the dye or pigment described above may be used alone or in combination of two or more.

(solvent)
As the solvent, many of organic solvents that have been conventionally used in oil-based ballpoint pen inks can be used.
Specifically, for example, ethylene glycol monophenyl ether, benzyl alcohol, phenoxyethanol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, tetralin, propylene glycol monophenyl ether, dipropylene glycol monomethyl ether, An organic solvent such as dipropylene glycol monobutyl ether, dipropylene glycol monomethyl ether acetate, tripropylene glycol monomethyl ether, or N-methyl-2-pyrrolidone can be used as a solvent.

These organic solvents may be used alone or in combination of two or more.
(Structural viscosity imparting agent)
The structural viscosity imparting agent is for increasing the viscosity of the ink 80 and imparting a structural viscosity to the ink 80.
The ink 80 to which the structural viscosity-imparting agent is added exhibits a relatively high viscosity under a low shear rate, but exhibits a relatively low viscosity under a high shear rate.
Here, the ink 80 is placed at a low shear rate in the vicinity of the tip of the chip 20 during non-writing. For this reason, the ink 80 to which the structural viscosity imparting agent is added exhibits a relatively high viscosity in the vicinity of the tip of the chip 20 when not writing, thereby preventing leakage of the ink 80 from the tip of the chip 20 is doing.

On the other hand, in the vicinity of the tip of the chip 20 at the time of writing, the ink 80 is placed under a high shear rate. For this reason, the ink 80 to which this structural viscosity imparting agent has been added exhibits a relatively low viscosity near the tip of the tip 20 at the time of writing, and thus can be written smoothly.
Specifically, for example, carbon black (specifically, for example, carbon black MA-100 (trade name) manufactured by Mitsubishi Chemical Corporation) or fine particle silica (specifically, for example, manufactured by Nippon Aerosil Co., Ltd.) Inorganic fine particles such as Aerosil 380 (trade name)) can be used as a structural viscosity imparting agent.

These inorganic fine particles may be used alone or in combination of two or more.
(resin)
The resin is used to increase the viscosity of the ink 80 or to disperse the structural viscosity imparting agent in the ink 80.
Specifically, for example, ketone resin (specifically, for example, Hilac # 111 (trade name) manufactured by Hitachi Chemical Co., Ltd.), phenol resin, maleic resin, xylene resin, polyethylene oxide, rosin resin, rosin derivative Terpene resin, chroman-indene resin, polyvinyl butyral, polyvinylpyrrolidone (specifically, for example, polyvinylpyrrolidone K-90 (trade name) manufactured by ISP), vinylpyrrolidone-vinyl acetate copolymer, polymethacrylic acid Resins such as esters and polyacrylic acid-polymethacrylic acid copolymers can be used as resins for increasing the viscosity of the ink 80 or for dispersing the structural viscosity imparting agent in the ink 80.

These resins may be used alone or in appropriate combination of two or more.
(Additive)
As additives, it is possible to use thickeners, spinnability imparting agents, surfactants, dispersants, lubricants, color formers, antibacterial agents, and the like conventionally used for oil-based ball 50 pen ink 80. it can.
Specifically, for example, oleic acid as a lubricant and color former, Hilac # 111 (trade name, manufactured by Hitachi Chemical Co., Ltd.) as a thickener and a dispersant, thickener, dispersant and spinnability As an imparting agent, polyvinylpyrrolidone K-90 (trade name, manufactured by ISP Co., Ltd.) or the like can be used as an additive.

(Method for producing ink 80)
The ink 80 is manufactured by mixing and stirring the above-described components.
Specifically, the ink 80 is manufactured through a pigment dispersion stage, an aerosol dispersion stage, a dye dissolution stage, a mixing stage, a filtration stage, and the like.
The pigment dispersion stage is a stage in which the pigment is dispersed in a solvent or the like.
In this pigment dispersion stage, first, Hilac # 111 (resin), oleic acid (additive), benzyl alcohol (solvent), phenoxyethanol (solvent) and the like are mixed while heating to about 60 ° C., and carbon black MA is added thereto. Add -100 (pigment) and stir using a kneader, planetary mixer, roll, or the like.

The Aerosil dispersion stage is a stage in which Aerosil is dispersed in a solvent or the like.
In this aerosil dispersion stage, first, Hilac # 111 (resin), polyvinylpyrrolidone K-90 (resin), benzyl alcohol (solvent), phenoxyethanol (solvent) and the like are mixed while being heated to about 60 ° C. Add 380 (structural viscosity-imparting agent) and stir using a kneader, planetary mixer, roll, or the like.
The dye dissolving step is a step in which the dye is dissolved in a solvent or the like.
In this dye dissolution stage, nigrosine EX (dye), spirone violet C-RH (dye), spirone yellow C-2GH (dye), benzyl alcohol (solvent), phenoxyethanol (solvent), oleic acid (additive), etc. Are dissolved while heating to about 60 ° C. to dissolve them.

The mixing step is a step of mixing the products obtained in the above steps.
In this mixing stage, the one obtained in the pigment dispersion stage, the one obtained in the aerosil dispersion stage, and the one obtained in the dye dissolution stage are stirred for about 1 hour while heating at about 60 ° C. Are dissolved and mixed.
The filtration step is a step of filtering the product obtained in the mixing step.
This filtration step removes impurities in the ink 80.
(Viscosity of ink 80)
The ink 80 is prepared so that the viscosity at 25 ° C. is 10,000 mPa · s or more and 60,000 mPa · s or less.

Then, by adjusting the viscosity of the ink 80 at 25 ° C. to 10,000 mPa · s or more and 60,000 mPa · s or less, the writing quality becomes smooth while preventing the ink 80 from leaking from the tip of the chip 20. I am doing so.
If the viscosity of the ink 80 at 25 ° C. is less than 10,000 mPa · s, the ink 80 may leak from the tip of the chip 20.
On the other hand, when the viscosity of the ink 80 at 25 ° C. exceeds 60,000 mPa · s, the writing quality becomes heavy.
Of course, even if the viscosity of the ink 80 is outside the above range, it can be used.

(Pressurized gas 90)
The pressurized gas 90 is for extruding the ink 80 filled in the ink containing tube 30 in the direction of the chip 20, and is filled in the rear end side of the ink containing tube 30.
(Pressurized gas 90 pressure)
The pressurized gas 90 is set so that the pressure at the time of assembling the ballpoint pen refill 10 is 0.15 MPa to 0.4 MPa in absolute atmospheric pressure.
Then, by setting the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 to 0.15 MPa or more and 0.4 MPa or less in absolute atmospheric pressure, the ink 80 leaks from the clearance 65 and the ball from the ball house 61 While preventing 50 from popping out, the occurrence of fading of the ink 80 is prevented, and furthermore, the ink 80 is used up to the end.

If the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 is less than 0.15 MPa in absolute pressure, the ink 80 may be blurred, and the ink 80 may not be used up to the end. There is.
On the other hand, when the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 exceeds 0.4 MPa in absolute pressure, the ink 80 may leak from the clearance 65 or the ball 50 may jump out of the ball house 61. .
Of course, even when the pressure of the pressurized gas 90 at the time of assembling the ballpoint pen refill 10 is out of the above range, it can be used.

(Float 100)
The float 100 is for preventing the ink 80 filled in the ink storage tube 30 from flowing backward.
Specifically, the float 100 is formed in a substantially cylindrical shape, and an air groove 101 that penetrates to the side surface is provided on the bottom surface on one side, and a punching portion 102 is provided on the bottom surface on the other side. It has been.
The float 100 is integrally formed by injection molding using a synthetic resin such as polypropylene (PP).

The float 100 has the bottom surface provided with the air groove 101 directed toward the ink 80 side, and the bottom surface provided with the punched-through portion 102 directed toward the pressurized gas 90 side. It is housed inside the large diameter portion 31.
The air groove 101 is for preventing the opening on the large-diameter portion 31 side of the medium-diameter portion 32 from being blocked when the float 100 abuts on the inward stepped portion 34.
That is, as the ink 80 decreases, the float 100 moves inside the large-diameter portion 31 in the distal direction, and stops moving in the distal direction when it contacts the inward stepped portion 34. At this time, the bottom surface of the float 100 on the ink 80 side may block the opening of the medium diameter portion 32 on the large diameter portion 31 side. Therefore, an air groove 101 penetrating to the side surface of the float 100 is provided on the bottom surface of the float 100 on the ink 80 side so as not to block the opening of the medium diameter portion 32 on the large diameter portion 31 side.

Further, the punching portion 102 is for preventing the float 100 from sinking into the ink 80.
That is, since the float 100 is formed using a synthetic resin such as polypropylene (PP), the float 100 may sink in the ink 80. Therefore, by providing a penetrating portion 102 on the bottom surface of the float 100 on the pressurized gas 90 side, the apparent specific gravity is reduced so that the float 100 does not sink into the ink 80.
Further, the float 100 may be formed using a material that does not deform, crack (break), or swell by reacting with the ink 80. Therefore, a synthetic resin such as polypropylene (PP) is used. It is not limited to the case where it is formed.

Further, the float 100 only needs to be formed so as not to sink into the ink 80. Therefore, the float 100 is not limited to the case where it is formed so as to have the penetrating portion 102 on the bottom surface on the pressurized gas 90 side.
Specifically, for example, the float 100 may be formed using a material having a specific gravity smaller than that of the ink 80 so that the float 100 does not sink into the ink 80.
In addition, for example, even if the float 100 is formed using a material having a specific gravity greater than that of the ink 80, the apparent specific gravity is reduced by providing bubbles and the like so that the float 100 does not sink into the ink 80. Can be.

(Tail plug 40)
The tail plug 40 is for preventing the pressurized gas 90 filled in the ink containing tube 30 from leaking outside.
The tail plug 40 includes a metal fastener 41 and a rubber seal member 42 provided on one side of the fastener 41. The tail plug 40 is press-fitted into the vicinity of the rear end of the ink containing tube 30 with the seal member 42 facing forward. The tail plug 40 is improved in airtightness by a rubber seal member 42 and is improved in pressure resistance by a metal fastener 41.
(Other embodiments)
The ink groove 63 can be formed so as to reach the side surface portion 70 of the ball house 61 beyond the bottom surface portion 71 of the ball house 61. The ink groove 63 can be formed such that the tip of the ink groove 63 is located on the tip side of the ball center plane P. Specifically, a broach having a diameter larger than the inner diameter of the ball house 61 is inserted from the rear end side of the wire to the ball house 61 side, and the tip of the broach penetrates the bottom surface 71 of the ball house 61 to Try to reach the tip. Thereafter, the outside near the tip of the wire is cut thinly, and then the ball 50 is housed in the ball house 61, and the tip of the wire is rolled from the outside to form a crimped portion 64 at the tip of the wire. . Then, the ink groove 63 reaches the side surface portion 70 of the ball house 61 beyond the bottom surface portion 71 of the ball house 61, and the tip of the ink groove 63 can be positioned on the tip side of the ball center plane P. As a result, the caulking portion inner peripheral rear end face Q is made to coincide with the ball center plane P or within a predetermined range on the rear end side from the ball center plane P (within a range satisfying (L / R) ≦ 0.036). Even when positioned, the ink 80 can be sufficiently supplied to the balls 50 stored in the ball house 61.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
(Evaluation 1 of ballpoint refill 10)
Table 1 below shows the configurations of the ball-point pen refills 10 from Example 1-1 to Example 1-6 and Comparative Example 1-1 to Comparative Example 1-10. Evaluations on “bottom drop” and “wet paper writing performance” are shown, respectively, and “overall evaluation” is shown.
Further, “dropping of the ink 80” means that a lump of the ink 80 is formed at the tip of the chip 20, and the lump of the ink 80 adheres to the paper surface and stains the paper surface.

  “Wet paper writing performance” refers to the performance of whether or not a sufficiently dark drawn line is obtained after writing on PPC paper wetted with water. That is, the PPC paper wetted with water tends to flutter up. For this reason, when writing on PPC paper wetted with water, fiber scraps adhere to the surface of the ball 50. Here, if it is difficult for fiber waste adhered to the surface of the ball 50 to be caught in the ball house 61 and the fiber waste caught in the ball house 61 can be easily discharged out of the ball house 61, water-soaked PPC paper Even after writing, a sufficiently dark drawn line can be obtained, but the fiber waste adhering to the surface of the ball 50 can easily be caught in the ball house 61 and the fiber waste caught in the ball house 61 can be If it is difficult to spit out of the house 61, the writing line becomes thin after writing on PPC paper wetted with water, and in the worst case, writing becomes impossible.

Here, each of the ballpoint pen refills 10 shown in Example 1-1 to Example 1-6 and Comparative Example 1-1 to Comparative Example 1-10 is “the ball center plane P and the caulking portion inner peripheral rear end surface Q. The distances L ”are formed differently. That is, each ball-point pen refill 10 shown in Example 1-1 to Example 1-6 and Comparative Example 1-1 to Comparative Example 1-10 is formed so that “L / R” is different from each other. is there.
Further, in each of the ballpoint pen refills 10 shown in Example 1-1 to Example 1-6 and Comparative Example 1-1 to Comparative Example 1-10, the ball 50 is made of cemented carbide and the holder 60 is made of a material. The diameter of the ball 50 is 0.7 mm, the diameter of the ball 50 is 0.7 mm, the viscosity of the ink 80 at 25 ° C. is 30,000 mPa · s, and the pressure of the pressurized gas 90 when the ballpoint pen refill 10 is assembled. Was 0.3 MPa in absolute pressure.

The composition of ink 80 is
Benzyl alcohol (solvent): 37.4% by weight
Phenoxyethanol (solvent): 1.5% by weight
Oleic acid (additive): 8.0% by weight
Nigrosine EX (colorant): 22.5% by weight
Spiro violet C-RH (colorant): 9.0% by weight
Spiron Yellow C-2GH (colorant): 6.0% by weight
Carbon black MA-100 (colorant / structural viscosity imparting agent): 8.0% by weight
Hilac # 111 (resin): 5.4% by weight
Polyvinylpyrrolidone K-90 (resin): 0.8% by weight
Aerosil 380 (structural viscosity imparting agent): 1.4% by weight
It was.

In addition, the test of “dropping ink 80”
First, make sure you can write by hand,
One hour after the end of handwriting,
Using an automatic writing tester compliant with ISO standard 14145-1
Writing speed: 4.5m / min
Writing angle: 60 °
Writing load: 0.39N
It went on condition of.

In addition, the evaluation of “blown ink 80”
Take the average of the results of the above test for five ballpoint pen refills 10,
(B) Writing 100 m and the number of drops of ink 80 was less than 5 → Evaluation “A”
(B) Written 100 m and the number of drops of ink 80 was 5 or more and less than 15 → Evaluation “B”
(C) Written 100 m and the number of drops of ink 80 was 15 or more and less than 30 → Evaluation “C”
(D) Written 100m and the number of drops of ink 80 was 30 or more → Evaluation "D"
It was.

In addition, the test of “wet paper writing performance”
First, make sure you can write by hand,
Next, on a PPC paper wetted with water, write a circle with a diameter of 2 cm by hand for 30 laps, and repeat this 10 times.
Using an automatic writing tester compliant with ISO standard 14145-1
Writing speed: 4.5m / min
Writing angle: 60 °
Writing load: 1.96N
It went on condition of.

In addition, evaluation of "wet paper writing performance"
Take the average of the results of the above test for five ballpoint pen refills 10,
(B) A sufficiently dark line was obtained from the beginning to the end → Evaluation “A”
(B) The first few meters were thin, but after that a sufficiently dark one was obtained → Evaluation “B”
(C) The stroke was thin from beginning to end → Evaluation “C”
(D) Ink 80 did not come out and writing was impossible → Evaluation “D”
It was.
Moreover, comprehensive evaluation was shown by "(circle)" or "x" by judging on the following reference | standard.

(A) When the ink drop-off evaluation is “A” and the wet paper writing performance is “A”, the occurrence of ink 80 scumming is suppressed and the ink adheres to the surface of the ball 50. The fiber waste is hard to be caught in the ball house 61, and the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, so that a comfortable writing can be maintained. It was.
(B) When the ink drop-off evaluation is “A” and the wet paper writing performance evaluation is “B”, the occurrence of ink 80 sticking is suppressed and the ink adheres to the surface of the ball 50 The fiber waste is hard to be caught in the ball house 61, and the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, so that a comfortable writing can be maintained. It was.

(C) When the ink drop-off evaluation is “B” and the wet paper writing performance evaluation is “A”, the occurrence of ink 80 scumming is suppressed and the ink adheres to the surface of the ball 50 The fiber waste is hard to be caught in the ball house 61, and the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, so that a comfortable writing can be maintained. It was.
(D) In cases other than the above (a) to (c), the occurrence of ink 80 swarf cannot be suppressed, or fiber scraps adhering to the surface of the ball 50 are easily caught in the ball house 61, or the ball The fiber waste caught in the house 61 has one or more of the disadvantages that it is difficult to spit out of the ball house 61, and it cannot be said that a comfortable writing can be maintained. It was.

  In Table 1, “R” is “the diameter of the ball 50 (unit: mm)”, and “L” is “the distance L (unit: mm) between the ball center plane P and the inner circumferential rear end face Q. Are indicated respectively.

このように、実施例１−１から実施例１−６までの各ボールペンリフィール10は、インク80のボテの発生が抑えられ、かつ、ボール50の表面に付着した繊維屑がボールハウス61内に巻き込まれにくく、かつ、ボールハウス61内に巻き込まれた繊維屑がボールハウス61外に吐き出されやすく、快適な筆記が維持できた。
すなわち、実施例１−１から実施例１−６までに示すようにボールペンリフィール10を形成すれば、インク80のボテの発生が抑えられ、かつ、ボール50の表面に付着した繊維屑がボールハウス61内に巻き込まれにくく、かつ、ボールハウス61内に巻き込まれた繊維屑がボールハウス61外に吐き出されやすく、快適な筆記が維持できるのである。

As described above, in each of the ballpoint pen refills 10 from Example 1-1 to Example 1-6, the occurrence of the scum of the ink 80 is suppressed, and the fiber waste adhering to the surface of the ball 50 is contained in the ball house 61. It was difficult to be caught up, and the fiber waste caught in the ball house 61 was easily discharged out of the ball house 61, so that comfortable writing could be maintained.
That is, if the ballpoint pen refill 10 is formed as shown in Example 1-1 to Example 1-6, the occurrence of the void of the ink 80 can be suppressed, and the fiber waste adhering to the surface of the ball 50 is removed from the ball house. It is difficult to get caught in the ball 61, and the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, so that comfortable writing can be maintained.

On the other hand, in each of the ballpoint pen refills 10 from Comparative Example 1-1 to Comparative Example 1-10, generation of ink 80 swarf is not suppressed, or fiber waste adhered to the surface of the ball 50 is caught in the ball house 61. It had one or more of the disadvantages that it was easy or the fiber waste caught in the ball house 61 was difficult to be discharged out of the ball house 61, and comfortable writing could not be maintained.
That is, when the ballpoint pen refill 10 is formed as shown in Comparative Example 1-1 to Comparative Example 1-10, the occurrence of the void of the ink 80 is not suppressed, or the fiber waste adhering to the surface of the ball 50 is caused by the ball house 61. Because it has one or more of the disadvantages that it is easy to get caught in the inside or that the fiber waste caught in the ball house 61 is difficult to be discharged out of the ball house 61, a comfortable writing cannot be maintained. is there.

Furthermore, when the limit numerical value of (L / R) was tested, the caulking portion inner peripheral rear end face Q was made to coincide with the ball center plane P or within a predetermined range on the rear end side from the ball center plane P ( (L / R) ≦ within a range satisfying 0.036), generation of ink 80 voids is suppressed, and fiber scraps adhering to the surface of the ball 50 are less likely to be caught in the ball house 61. In addition, it was confirmed that the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, and a comfortable writing can be maintained.
In addition, if the rear end face Q of the inner periphery of the crimping portion is positioned on the front end side of the ball center plane P, the play of the ball 50 in the ball house 61 becomes too large, and the ink 80 is excessively discharged from the clearance 65. It was confirmed that 80 spots were likely to occur.

On the other hand, when the inner circumferential rear end face Q of the crimped portion is positioned outside a predetermined range (0.036 <(L / R)) on the rear end side of the ball center plane P, the play of the ball 50 in the ball house 61 is small. The ball 50 becomes too stable in the ball house 61, and the fiber waste adhering to the surface of the ball 50 tends to be entangled into the ball house 61, and the fiber waste caught in the ball house 61 It was confirmed that it would be difficult to spit out of the ball house 61.
This test was performed by changing the composition of the ink 80, the viscosity of the ink 80, the pressure of the pressurized gas 90, and the like, but the same tendency as the above-mentioned result was observed.

Further, the present invention is not limited to the above embodiment.
(Evaluation 2 of ballpoint pen feel 10)
Table 2 below shows the configurations of the ballpoint pen refills 10 from Example 2-1 to Example 2-7 and Comparative Example 2-1 to Comparative Example 2-7. Evaluations on “bottom drop” and “wet paper writing performance” are shown, respectively, and “overall evaluation” is shown.
Here, in the evaluation 1, the diameter R of the ball 50 is “0.7 mm”, but in the evaluation 2, the diameter R of the ball 50 is “0.5 mm”. That is, in the evaluation 1 and the evaluation 2, the diameter R of the ball 50 is different. In evaluation 2, points other than the diameter R of the ball 50 (specifically, the material of the ball 50, the material of the holder 60, the composition of the ink 80, the viscosity of the ink 80, and the pressurized gas at the time of assembling the ballpoint pen refill 10) The pressure of 90) was the same as in Evaluation 1.

In addition, each ball-point pen refill 10 shown in Example 2-1 to Example 2-7 and Comparative Example 2-1 to Comparative Example 2-7 is “the distance between the ball center plane P and the inner peripheral rear end face Q of the crimped portion. "L" is formed differently. That is, each ball-point pen refill 10 shown in Example 2-1 to Example 2-7 and Comparative Example 2-1 to Comparative Example 2-7 is formed so that “L / R” is different. is there.
Further, the test of “dropping of ink 80” was performed under the same conditions as in the above evaluation 1.
Further, the evaluation of “dropping of ink 80” was performed based on the same criteria as in the above evaluation 1.
Further, the test of “wet paper writing performance” was performed under the same conditions as in the above evaluation 1.

Further, the evaluation of “wet paper writing performance” was performed based on the same criteria as in the above evaluation 1.
Moreover, comprehensive evaluation was performed on the same standard as said evaluation 1.
In Table 2, “R” is “the diameter of the ball 50 (unit: mm)”, and “L” is “the distance L (unit: mm) between the ball center plane P and the inner circumferential rear end face Q. Are indicated respectively.

このように、実施例２−１から実施例２−７までの各ボールペンリフィール10は、インク80のボテの発生が抑えられ、かつ、ボール50の表面に付着した繊維屑がボールハウス61内に巻き込まれにくく、かつ、ボールハウス61内に巻き込まれた繊維屑がボールハウス61外に吐き出されやすく、快適な筆記が維持できた。
すなわち、実施例２−１から実施例２−７までに示すようにボールペンリフィール10を形成すれば、インク80のボテの発生が抑えられ、かつ、ボール50の表面に付着した繊維屑がボールハウス61内に巻き込まれにくく、かつ、ボールハウス61内に巻き込まれた繊維屑がボールハウス61外に吐き出されやすく、快適な筆記が維持できるのである。

As described above, in each of the ballpoint pen refills 10 from Example 2-1 to Example 2-7, the generation of the ink 80 was suppressed, and the fiber waste adhering to the surface of the ball 50 was found in the ball house 61. It was difficult to be caught up, and the fiber waste caught in the ball house 61 was easily discharged out of the ball house 61, so that comfortable writing could be maintained.
That is, if the ball-point pen refill 10 is formed as shown in Example 2-1 to Example 2-7, the occurrence of voids in the ink 80 can be suppressed, and the fiber waste adhering to the surface of the ball 50 is removed from the ball house. It is difficult to get caught in the ball 61, and the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, so that comfortable writing can be maintained.

On the other hand, in each of the ballpoint pen refills 10 from Comparative Example 2-1 to Comparative Example 2-7, the generation of the ink 80 is not suppressed, or the fiber waste adhered to the surface of the ball 50 is caught in the ball house 61. It had one or more of the disadvantages that it was easy or the fiber waste caught in the ball house 61 was difficult to be discharged out of the ball house 61, and comfortable writing could not be maintained.
That is, when the ballpoint pen refill 10 is formed as shown in Comparative Example 2-1 to Comparative Example 2-7, the generation of the ink 80 voids cannot be suppressed, or the fiber waste adhering to the surface of the ball 50 is caused by the ball house 61. Because it has one or more of the disadvantages that it is easy to get caught in the inside or that the fiber waste caught in the ball house 61 is difficult to be discharged out of the ball house 61, a comfortable writing cannot be maintained. is there.

Furthermore, when an experiment was conducted on the limit value of (L / R), the caulking portion inner peripheral rear end face Q was made to coincide with the ball center plane P or within a predetermined range on the rear end side from the ball center plane P ( (L / R) ≦ within a range satisfying 0.036), generation of ink 80 voids is suppressed, and fiber scraps adhering to the surface of the ball 50 are less likely to be caught in the ball house 61. In addition, it was confirmed that the fiber waste caught in the ball house 61 is easily discharged out of the ball house 61, and a comfortable writing can be maintained.
In addition, if the rear end face Q of the inner periphery of the crimping portion is positioned on the front end side of the ball center plane P, the play of the ball 50 in the ball house 61 becomes too large, and the ink 80 is excessively discharged from the clearance 65. It was confirmed that 80 spots were likely to occur.

On the other hand, when the inner circumferential rear end face Q of the crimped portion is positioned outside a predetermined range (0.036 <(L / R)) on the rear end side of the ball center plane P, the play of the ball 50 in the ball house 61 is small. The ball 50 becomes too stable in the ball house 61, and the fiber waste adhering to the surface of the ball 50 tends to be entangled into the ball house 61, and the fiber waste caught in the ball house 61 It was confirmed that it would be difficult to spit out of the ball house 61.
This test was performed by changing the composition of the ink 80, the viscosity of the ink 80, the pressure of the pressurized gas 90, and the like, but the same tendency as the above-mentioned result was observed.

  Further, the present invention is not limited to the above embodiment.

Side surface sectional drawing of the ball-point pen refill which concerns on this Embodiment. The A section enlarged view of FIG. The B section enlarged view of FIG. The principal part sectional drawing of a chip | tip. The perspective view of a float. Sectional drawing of the principal part of the chip | tip with which the conventional ball-point pen refill is provided. Sectional drawing of the principal part of the chip | tip with which the conventional ball-point pen refill is equipped (The state which inclined and used the long axis of the chip | tip with respect to the paper surface). Sectional drawing of the principal part of the chip | tip with which the conventional ball-point pen refill is provided. Sectional drawing of the principal part of the chip | tip with which the conventional ball-point pen refill is equipped (The state which inclined and used the long axis of the chip | tip with respect to the paper surface).

Explanation of symbols

10 Ballpoint refill
20 tip 20a long axis of tip
30 Ink tube 31 Large diameter part
32 Medium diameter part 33 Small diameter part
34 Inward step 35 Throttle
40 Tail plug 41 Fastener
42 Seal material
50 ball 50a ball center
60 holder 61 ball house
62 Ink guide hole 63 Ink groove
64 Caulking part 64a Inner circumferential surface of caulking part
64b Rear end of inner surface of caulking section 65 Clearance
66 Taper part 67 Body part
68 Fixed part 69 Outward stepped part
70 Side 71 Bottom
72 Ball seat
80 ink 90 pressurized gas
100 Float 101 Air groove
102 Punching part 110 Paper surface P Ball center plane Q Crimped inner periphery rear end surface R Diameter of ball L Distance between ball central plane and inner peripheral rear end surface

Claims (2)

An ink storage tube and a tip fixed to the tip of the ink storage tube are provided. The tip of the ink storage tube is filled with ink, and the rear end of the ink storage tube is filled with pressurized gas. It is a ballpoint pen refill that pushes ink toward the tip by the pressure of pressurized gas,
The chip includes a ball and a holder for holding the ball,
Near the tip of the holder is a ball house for storing balls,
At the tip of the holder, a caulking part is provided to prevent the ball stored in the ball house from jumping out of the ball house,
A plane perpendicular to the long axis of the chip and passing through the center of the ball is the ball center plane,
When the plane passing through the rear end of the inner peripheral surface of the crimped portion is the inner peripheral rear end surface of the crimped portion,
The caulking portion inner peripheral rear end surface coincides with the ball center plane, or is located on the rear end side with respect to the ball center plane,
Let L be the distance between the ball center plane and the inner periphery rear end surface
When the diameter of the ball is R,
(L / R) ≦ 0.036
Ballpoint pen refill characterized by satisfying.   2. The ballpoint pen refill according to claim 1, wherein the pressure of the pressurized gas when the ballpoint pen refill is assembled is an absolute pressure of 0.15 MPa to 0.4 MPa.

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