JP2010208182A - Ball-point pen tip, ball-point pen refill, and ball-point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball-point pen tip capable of obtaining excellent writing stroke feeling and capable of attaining stable nice writing feeling, a ball-point pen refill, and a ball-point pen. <P>SOLUTION: A channel branch groove 44 is provided to be extended along a circumferential direction of a receiving seat face 41, the channel branch groove 44 is communicated with a channel groove 43, and ink is supplied thereby from both the channel groove 43 and the channel branch groove 44, and an ink supply amount is increased between a writing ball 2A and the receiving seat face 41. A sufficient amount of the ink for covering the receiving seat face 41 is thereby supplied all the time, even when enlarging the receiving seat face 41 for receiving the writing ball 2A, to allow the smooth writing and to obtain the excellent writing feeling, and further the writing ball 2A is held in a prescribed position of a ball house 31 at the time of writing, by enlarging the receiving seat face 41, to attain the stable nice writing feeling. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ball-point pen tip provided with a writing ball to be transferred to a writing object, a ball-point pen refill including the ball-point pen tip, and a ball-point pen.

  Conventionally, ballpoint pens such as oil-based ballpoint pens and gel ink ballpoint pens have been widely used as writing instruments. Such a ballpoint pen has a structure in which a ballpoint pen tip having a writing ball for writing is provided at the tip end thereof is rotatably provided, and an ink storage portion storing ink is connected to the rear of the ballpoint pen tip. Is common.

The ball-point pen tip communicates with the ball house formed as a storage space for rotatably storing the writing ball, a back hole extending from the rear end of the ball-point pen tip to the vicinity of the ball house, and the ball house and the back hole. An ink guide hole is provided.
The ink stored in the ink storage portion is supplied to the writing ball in the ball house through the back hole and the ink guide hole.

And, around the ink guide hole in the inner surface of the ball house, there is a receiving surface formed as a spherical surface for contacting the surface of the writing ball, and a receiving portion for receiving the writing ball on the receiving surface, There are provided a plurality of channel grooves formed in a substantially quadrangular cross section in which the inner surface on both sides in the extending direction is separated from each other by extending radially outward from the periphery of the ink guide hole to divide the receiving surface of the receiving portion. It has been.
In addition to ink being directly supplied from the ink guide hole to the surface of the writing ball, ink is supplied from the ink guide hole through the channel groove. As a result, ink is simultaneously supplied to a wide area on the surface of the writing ball.

In such a ballpoint pen, the writing ball is rotated inside the ball house, the ink is attached to the surface of the writing ball, and the ink attached to the surface of the writing ball is further transferred to the writing object. Writing on things is done. For this reason, unless ink that functions as a lubricant is always interposed between the writing ball and the receiving surface, smooth writing cannot be performed.
In other words, if a sufficient amount of ink to cover the entire seating surface is always supplied between the writing ball and the seating surface, the entire seating surface is always covered with ink, so that the so-called oil film is cut off. It can be written smoothly and an excellent writing feeling can be obtained.
For this reason, if the area of the seating surface is reduced, the amount of ink for covering the entire surface of the seating surface can be reduced. Therefore, in order to obtain an excellent writing feeling, it is better to reduce the area of the seating surface. It is advantageous.

On the other hand, the writing ball is applied with a force pressing toward the rear end side and a force opposite to the moving direction of the pen tip. If the position of the writing ball is deviated from a predetermined position of the ball house by these forces, a stable writing taste cannot be ensured.
For this reason, the seating surface formed as a spherical surface is enlarged, thereby expanding the holding range of the writing ball by the seating portion, and not only the force of pressing toward the rear end side but also the direction opposite to the moving direction of the pen tip. It is necessary that the direction force can be received by the seating surface, and even if these two directions of force are applied to the writing ball, the writing ball needs to be held at a predetermined position of the ball house. Further, if the seating surface is enlarged, the wear of the seating surface can be suppressed, thereby improving the durability performance of the ball-point pen tip, particularly the anti-bottom performance.

  As described above, if the area of the seating surface is reduced, an excellent writing feeling can be obtained, but it becomes difficult to ensure stable writing quality and anti-bottom performance, while the area of the seating surface is increased and the seating surface is improved. If the holding range of the writing ball by the part is widened, it is possible to ensure a stable writing taste and anti-bottom performance, but it becomes difficult to obtain an excellent writing feeling. Therefore, there is a contradictory relationship between obtaining an excellent writing feeling and ensuring a stable writing quality and anti-rotation performance, and it is difficult to improve both.

By the way, in order to improve the writing feeling at the time of writing, the following ball-point pen tips have been proposed (1) to (3).
(1) When the ball house is formed on the ballpoint pen tip, the seat surface is made smaller by providing a counterbore inside the portion that becomes the seat surface formed on the inner surface of the ball house. Reduce the amount of ink required to cover the entire surface, prevent insufficient supply of ink as a lubricant, and enable smooth rotation of the writing ball at the time of writing, thereby utilizing the ballpoint pen tip The writing feeling of a ball-point pen is made excellent (for example, refer patent document 1).

  (2) The first point between the inner peripheral edge of the opening formed by the crimping portion for preventing the writing ball from coming out of the ball house at the tip of the ballpoint pen tip and the surface of the writing ball located in the vicinity of the opening. A void is formed, and a second void is formed between the inner surface of the crimped portion and the surface of the writing ball concealed inside the ball house, and smooth ink is formed by the first void. The return phenomenon is promoted, the inhibition of the ink ejection that follows later is suppressed, and the ink is temporarily stored in the vicinity of the tip of the ball-point pen tip by the second gap portion. In this way, the ink supply amount wave is buffered, thereby significantly improving the ink followability during writing and improving the writing feeling of the ballpoint pen using the ballpoint pen tip (for example, See Permissible Document 2).

  (3) The receiving surface formed at the periphery of the ink guide hole on the inner surface of the ball house is divided into an outer support section and an inner support section by an annular groove extending in the circumferential direction and formed in a ring shape. Furthermore, for the part that crosses the inner support section of the channel groove extending radially outward from the periphery of the ink guide hole, the inter-surface dimension of the inner side surfaces on both sides, that is, the width dimension is significantly reduced to support the inner side. A closed annular shape is formed by closing the plane shape of the compartment, thereby forming a sealed structure between the inner support compartment and the surface of the writing ball, and preventing air from entering the inside of the ball-point pen tip when the pen tip is directed upward. Ensure airtightness. Here, the width dimension of the inner support section is made smaller than that of the outer support section so that a sufficient amount of ink can be secured even if the width dimension of the portion of the channel groove crossing the inner support section is significantly reduced. Thus, in order to ensure airtightness, even if the width of the channel groove is partially narrowed, the ink supply amount at the time of writing is ensured, and the writing feeling of the ballpoint pen using the ballpoint pen tip is not impaired. (For example, refer to Patent Document 3).

JP 2001-39077 A JP-A-61-205195 Japanese Examined Patent Publication No. 38-7766

The above-described ballpoint pen tip can improve the writing feeling at the time of writing to some extent, but has a problem that it cannot achieve both excellent writing feeling at writing and a stable writing taste.
In particular, in the ballpoint pen tip (3), since the width dimension of the portion that crosses the inner support section of the channel groove is extremely small, when the pen tip moves quickly such as for shorthand writing, sufficient ink is supplied to the entire receiving surface. In other words, the oil film runs out, and the writing feeling cannot be improved sufficiently.

  Therefore, the present invention has been made in view of the problems of the above-described background art, and the object of the present invention is to provide a ballpoint pen that can achieve excellent writing feeling and achieve stable writing quality. It is to provide a chip, a ballpoint pen refill and a ballpoint pen.

Each invention has been made to achieve the above-mentioned object. The features of each invention will be described below with reference to the embodiments of the invention shown in the drawings.
In addition, a code | symbol shows the code | symbol used in embodiment of this invention, and does not limit the technical scope of this invention.

(First invention)
(Feature point)
The first aspect of the present invention is characterized by the following points.
That is, the first invention of the present invention comprises a writing ball (2A) to be transferred to a writing material,
This writing ball (2A) has a holder (21) rotatably provided at the tip,
In the holder (21),
A ball house (31) formed as a storage space for rotatably storing the writing ball (2A);
A back hole (32) extending from the rear end to the vicinity of the ball house (31);
An ink guide hole (35) communicating the ball house (31) and the back hole (32) with each other;
The ball house (31) has a seating surface (41) formed around the ink guide hole (35) on the inner surface of the ball house (31) and abutting against the surface of the writing ball (2A). 41) a receiving portion (40) for receiving the writing ball (2A);
The ink guide hole (35) extends radially outward from the peripheral edge (35A) to divide the seating surface (41) of the seat portion (40), and the inner side surfaces (43A) on both sides in the stretching direction. A ballpoint pen tip (20) provided with a plurality of channel grooves (43) formed in cross-sectional shapes spaced apart from each other,
The receiving surface (41) is carved in the receiving surface (41) along the circumferential direction from the edge (41A) facing the channel groove (43) and communicates with the channel groove (43). Channel branch grooves (44, 45) are provided.

(Second invention)
(Feature point)
The second aspect of the present invention is characterized by the following points.
That is, the second invention of the present invention is a writing ball (2A) to be transferred to a writing material,
This writing ball (2A) has a holder (21) rotatably provided at the tip,
In the holder (21),
A ball house (31) formed as a storage space for rotatably storing the writing ball (2A);
A back hole (32) extending from the rear end to the vicinity of the ball house (31);
An ink guide hole (35) communicating the ball house (31) and the back hole (32) with each other;
The ball house (31) has a seating surface (41) formed around the ink guide hole (35) on the inner surface of the ball house (31) and in contact with the surface of the writing ball (2A). 41) a receiving portion (40) for receiving the writing ball (2A);
The ink guide hole (35) extends radially outward from the peripheral edge (35A) to divide the seat surface (41) of the seat portion (40), and the inner side surfaces (43A) on both sides in the stretch direction. A ballpoint pen tip (20) provided with a plurality of channel grooves (43) formed in cross-sectional shapes spaced apart from each other,
The receiving surface (41) is carved from the edge (41B) facing the ink guide hole (35) radially outward to the middle of the receiving surface (41) and the ink guide hole (35). ) Is provided with channel auxiliary grooves (46, 47) communicating with each other.

(Third invention)
(Feature point)
The third aspect of the present invention is characterized by the following points.
That is, the third invention of the present invention is a writing ball (2A) to be transferred to a writing object,
This writing ball (2A) has a holder (21) rotatably provided at the tip,
In the holder (21),
A ball house (31) formed as a storage space for rotatably storing the writing ball (2A);
A back hole (32) extending from the rear end to the vicinity of the ball house (31);
An ink guide hole (35) communicating the ball house (31) and the back hole (32) with each other;
The ball house (31) has a seating surface (41) formed around the ink guide hole (35) on the inner surface of the ball house (31) and in contact with the surface of the writing ball (2A). 41) a receiving portion (40) for receiving the writing ball (2A);
The ink guide hole (35) extends radially outward from the peripheral edge (35A) to divide the receiving surface (41) of the receiving portion (40), and the inner side surfaces on both sides in the extending direction are separated from each other. A ballpoint pen tip provided with a plurality of channel grooves formed in a cross-sectional shape,
A channel which is carved in the seating surface (41) along the circumferential direction from an edge (41A) facing the channel groove (43) of the seating surface (41) and communicates with the channel groove (43). Branch groove (45),
The receiving surface (41) is carved from the edge (41B) facing the ink guide hole (35) radially outward to the middle of the receiving surface (41) and the ink guide hole (35). ) And channel auxiliary grooves (46, 47) communicating with each other.

(Fourth invention)
(Feature point)
According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention described above, the following features are provided.
That is, the fourth invention of the present invention is characterized in that the ink is an oil-based ink.

(Fifth invention)
(Feature point)
A fifth aspect of the present invention relates to a ballpoint pen refill (2), and includes the ballpoint pen tip (20) according to any one of the first to fourth aspects of the present invention described above. It is characterized by this.

(Sixth invention)
(Feature point)
A sixth invention of the present invention relates to the ballpoint pen (1) and includes the ballpoint pen tip (20) according to any one of the first to fourth inventions of the present invention described above. It is characterized by.

(The invention's effect)
The present invention configured as described above has the following effects.
That is, according to the present invention, there is provided a channel branch groove carved in the seat surface along the circumferential direction from an edge facing the channel groove of the seat surface, and the channel branch groove communicates with the channel groove or is received. A channel auxiliary groove is provided that is carved from the edge of the seat surface facing the ink guide hole radially outward to the middle of the receiving surface, and this channel auxiliary groove communicates with the ink guide hole. Between the seating surface, ink can be supplied not only from the channel groove, but also from the channel branch groove or channel auxiliary groove, and the amount of ink supply between the writing ball and the receiving surface can be increased, Even if the receiving surface for receiving the writing ball is enlarged, a sufficient amount of ink can be always supplied between the writing ball and the receiving surface to cover the entire receiving surface.
As a result, even if the seating surface is enlarged, the entire seating surface is always covered with ink, so that the oil film is not cut out, writing can be performed smoothly, and excellent writing feel can be obtained. In addition, it is possible to expand the seating surface that receives the writing ball, and by expanding the seating surface, the holding range of the writing ball by the seating portion is expanded, and the writing ball is held at a predetermined position of the ball house during writing. Thus, a stable writing quality can be achieved, and the above-described object is achieved.

It is the front view and plane sectional view which show the ball-point pen concerning 1st Embodiment of this invention. It is the front view and plane sectional view which show the ball-point pen refill concerning the said 1st Embodiment. It is a front view which shows the ball-point pen tip which concerns on the said 1st Embodiment. It is sectional drawing which shows the principal part of the ball-point pen tip concerning the said 1st Embodiment. It is a top view which shows the receiving surface which concerns on the said 1st Embodiment. It is sectional drawing which shows the principal part of the ball-point pen tip concerning 2nd Embodiment of this invention. It is a top view which shows the receiving surface which concerns on the said 2nd Embodiment. It is sectional drawing which shows the principal part of the ball-point pen tip concerning 3rd Embodiment of this invention. It is a top view which shows the receiving surface which concerns on the said 3rd Embodiment. It is sectional drawing which shows the principal part of the ball-point pen tip concerning 4th Embodiment of this invention. It is a top view which shows the receiving surface which concerns on the said 4th Embodiment. It is sectional drawing which shows the principal part of the ball-point pen tip which concerns on 5th Embodiment of this invention. It is a top view which shows the receiving surface which concerns on the said 5th Embodiment.

(First embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment that is the best mode for carrying out the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of the present invention. FIG. 1 is a front view and a plan sectional view showing a ballpoint pen according to the first embodiment, FIG. 2 is a front view and a plan sectional view showing a ballpoint pen refill according to the first embodiment, and FIG. FIG. 4 is a cross-sectional view illustrating a main part of the ball-point pen tip according to the first embodiment, and FIG. 5 is a plan view illustrating a seating surface according to the first embodiment. It is.
In addition, in this specification, the front-end | tip in a writing instrument means the edge part of the side in contact with writing objects, such as a paper, among the both ends of a shaft cylinder. Moreover, the edge part on the opposite side is called the rear end in a writing instrument.

(Schematic configuration of the ballpoint pen 1)
As shown in FIG. 1, the ball-point pen 1 according to the first embodiment includes a ball-point pen refill 2 for writing with oil-based ink and a shaft cylinder 3 for storing the ball-point refill 2 therein. .

(Shaft 3)
As shown in FIG. 1, the shaft tube 3 is arranged on the left side in FIG. 1 and connects the tapered front shaft portion 3A and the rear shaft portion 3B arranged on the right side in FIG. It is a thing.
That is, as shown in FIG. 1B, the front shaft portion 3A has a male screw portion 3C formed on the outer peripheral surface in the vicinity of the end portion disposed on the shaft portion 3B side.
On the other hand, the rear shaft portion 3B has a female screw portion 3D that is threadedly engaged with the male screw portion 3C on the front shaft portion 3A side on the inner peripheral surface in the vicinity of the end portion disposed on the front shaft portion 3A side. It has become.
Accordingly, the front shaft portion 3A and the rear shaft portion 3B are connected to each other by screwing the male screw portion 3C and the female screw portion 3D, and the screwing of the male screw portion 3C and the female screw portion 3D is released. By doing so, separation is possible.

Here, the front end portion 3E for projecting the front end of the writing body is provided at the front end portion of the front shaft portion 3A.
On the other hand, the rear end portion of the rear shaft portion 3B is provided with an opening 3F through which a rear end portion of a button portion 12 (described later) provided for receiving a knock operation force is inserted.
Further, inside the rear shaft portion 3B, there are a rotor 11 for keeping the tip of the writing body protruding from the tip end 3E of the shaft tube 3 in a knocking operation, and a tip end 3E of the shaft tube 3 Are provided with a button portion 12 for receiving a knock operation force for projecting the front end of the cursive body, and a coil spring 14 for urging the rotor 11 to the rear end side.

The rotor 11 is a substantially cylindrical component, and is provided with a key portion 11B that protrudes radially outward from the outer peripheral surface thereof.
Such a rotor 11 has an opening on the front end side as a recess 11A, and the rear end of the ballpoint pen refill 2 is fitted into the recess 11A so as to be connected to the ballpoint pen refill 2. It has become.

  On the other hand, on the inner peripheral surface of the rear shaft portion 3B, a plurality of guide ribs 3G projecting radially inward from the inner peripheral surface and extending in the longitudinal direction of the rear shaft portion 3B are formed between the guide ribs 3G. In addition, a plurality of guide grooves 3H extending in the longitudinal direction of the rear shaft portion 3B are provided.

The plurality of guide ribs 3G are arranged at the same position in the longitudinal direction of the rear shaft portion 3B at the end portion on the front end side. A guide inclined surface 3I that is inclined in the same direction is provided at each of the end portions of the guide ribs 3G on the front end side.
Each of the plurality of guide grooves 3H guides the key portion 11B of the rotor 11 entering the inside thereof in the longitudinal direction of the rear shaft portion 3B.
The end portions on the front end side of these guide grooves 3H are arranged at the same position in the longitudinal direction of the rear shaft portion 3B. Then, two types of guide grooves 3H having different lengths in the longitudinal direction of the rear shaft portion 3B are provided. The long guide grooves 3H and the short guide grooves 3H are provided alternately in the circumferential direction.

The button portion 12 is formed such that the rear end portion protrudes from the opening 3F of the rear shaft portion 3B while the front end portion is immersed in the rear shaft portion 3B.
The coil spring 14 is housed in a compressed state inside the rear shaft portion 3B. That is, in the vicinity of the tip of the rear shaft portion 3B, a spring receiving tube 15 formed in a cylindrical shape having an outer diameter substantially the same as the inner diameter of the rear shaft portion 3B is press-fitted.
The coil spring 14 is interposed in a compressed state between the rear end edge of the spring receiving cylinder 15 and the front end edge of the rotor 11, and the rotor 11 and the button portion 12 are moved to the rear end side by the elastic force generated thereby. It has become a thing to urge toward.

Here, in a state where the key portion 11B of the rotor 11 is housed in the long guide groove 3H, the tip of the ballpoint pen refill 2 is in a state of being drawn into the tip opening 3E of the shaft tube 3. It is formed as follows.
Then, when the tip of the ballpoint pen refill 2 is housed inside the tip 3E, a pressing force is applied to the button 12 to push the button 12 toward the tip against the elastic force of the coil spring 14. The button part 12 moves the rotor 11 to the front end side, thereby causing the front end of the ballpoint pen refill 2 to protrude from the front end opening 3E.
When the button portion 12 is pushed all the way to the tip side, the key portion 11B of the rotor 11 moves to the tip side from the end portion of the long guide groove 3H and comes out of the long guide groove 3H. It is like that.

Thereafter, when the pressing force applied to the button portion 12 is released, the rotor 11 and the button portion 12 start moving toward the rear end side by the elastic force of the coil spring 14.
When the rotor 11 moves to the rear end side, the key portion 11B is guided by the guide inclined surface 3I provided at the end portion on the front end side of the guide rib 3G and rotates.
The rotation of the rotor 11 causes the key portion 11B to enter the inside of the short guide groove 3H arranged next to the key groove 11H instead of the long guide groove 3H that has entered before the knocking operation. It has become.
As a result, the ball pen refill 2 is maintained in a state in which the tip protrudes from the tip opening 3E of the shaft tube 3, and writing with the ball pen refill 2 is possible.

Then, after the writing is finished, the ball-point refill 2 knocks the button portion 12 again, in other words, by performing a knocking operation, the tip of the ball-point refill 2 is drawn into the tip opening 3E of the shaft tube 3. ing.
That is, when the knocking operation is performed in a state where the tip of the ballpoint pen refill 2 protrudes from the tip end 3 </ b> E of the shaft cylinder 3, the key portion 11 </ b> B is long before the knocking operation due to the rotation of the rotor 11. It comes out of the short guide groove 3H and enters the long guide groove 3H arranged next to the guide groove 3H. Thereby, the ball-point pen refill 2 is retracted to the rear end side of the shaft tube 3 by the elastic force of the coil spring 14, and the tip is drawn into the tip opening 3E.

(Ball pen refill 2)
As shown in FIG. 2, the ball-point refill 2 includes a ball-point pen tip 20 in which a writing ball 2A is rotatably provided at the tip, and a pipe in which oil-based ink for writing used in the ball-point pen tip 20 is stored. It has a cylindrical body 2B.

(Ball pen tip 20)
As shown in FIG. 3, the ball-point pen tip 20 is disposed at the tip of the ball-point pen tip 20, and the above-mentioned writing ball 2A for transferring the ink adhering to the surface to the writing object and the writing ball 2A are freely rotatable. And a holder 21 to be held.
Among these, the holder 21 is formed with a hollow portion 30 penetrating the whole from the front end to the rear end. The holder 21 is disposed at a substantially central portion, and is formed in a cylindrical shape with the pipe portion 21A and the pipe portion. A tapered portion 21B that is tapered at the front end side of 21A and a reduced diameter portion 21C that is formed at the rear end side of the pipe portion 21A and has an outer diameter smaller than that of the pipe portion 21A are provided.
The holder 21 is connected to the distal end portion of the cylindrical body 2B by fitting the reduced diameter portion 21C into the inside of the cylindrical body 2B formed in a pipe shape.

Here, a ball house 31, which is a storage space for rotatably storing the writing ball 2 </ b> A, is formed as a part of the hollow portion 30 inside the tip portion of the holder 21.
Further, a back hole 32 extending from the rear end to the vicinity of the ball house 31 is formed as a part of the hollow portion 30 at the rear end portion of the holder 21, in other words, at the rear end portion of the ballpoint pen tip 20. The back hole 32 communicates with the inside of the cylindrical body 2B and serves as a space for introducing the ink stored in the cylindrical body 2B.
The back hole 32 is provided with a small diameter portion 33 and a large diameter portion 34 having different inner diameters. Among these, the small diameter portion 33 having a small inner diameter is formed in the tapered portion 21B, and the large diameter portion 34 having a large inner diameter is formed across the pipe portion 21A and the reduced diameter portion 21C.
Furthermore, an ink guide hole 35 that allows the ball house 31 and the back hole 32 to communicate with each other is formed inside the holder 21 as a part of the hollow portion 30.

As shown in FIG. 4, the front end portion of the holder 21 is a crimped portion 22 that is bent so as to cover the surface of the writing ball 2A. The caulking portion 22 is a stopper that prevents the writing ball 2 </ b> A housed inside the ball house 31 from coming out of the ball house 31.
The ball house 31 is formed with a receiving portion 40 for receiving the writing ball 2A. As shown in FIGS. 4 and 5, the seat portion 40 is formed around the ink guide hole 35 on the inner surface of the ball house 31 and has a seat surface 41 that comes into contact with the surface of the writing ball 2A. The seating surface 41 receives the writing ball 2A. In FIG. 5, the hatched portion is the receiving surface 41.

Further, the ball house 31 extends radially outward from the peripheral edge 35A of the ink guide hole 35 to divide the receiving surface 41 of the receiving portion 40 into a plurality of parts, and the inner side surfaces 43A on both sides in the extending direction are mutually connected. A plurality of channel grooves 43 formed in a substantially quadrangular shape and spaced apart are provided.
Further, the ball house 31 is sculpted in the seating surface 41 along the circumferential direction from a substantially central portion of the end edge 41 </ b> A facing the channel groove 43 of the seating surface 41, and communicated with the channel groove 43. Channel branch grooves 44 are provided.

Here, each of the channel branch grooves 44 is disconnected from the end edge 41A of the seating surface 41 at a position before the center of the seating surface 41, and reaches the end edge 41A on the opposite side. Not.
Each of the channel branch grooves 44 has a width dimension and a depth dimension sufficient to circulate an amount of ink to be supplied between the writing ball 2 </ b> A and the receiving surface 41.
For example, when the diameter of the writing ball 2A is 0.7 mm, 0.03 mm can be adopted as the width dimension of the channel branch groove 44, and 0.03 mm can be adopted as the depth dimension of the channel branch groove 44.

(ink)
Next, the ink employed in the present embodiment will be briefly described.
The first embodiment includes a colorant, a main solvent in which the solvent represented by the following chemical formula 1 accounts for 50% by mass or more of the total solvent in the ink, and a resin soluble in this solvent, and the measurement temperature : Oil-based ink in the range of 700 mPa · s to 8,000 mPa · s at 25 ° C. and shear rate: 3.83 / s is employed.

Specific examples of the main solvent corresponding to Chemical Formula 1 include 3-methoxybutanol, 3-methyl-3-methoxybutanol, 3-methyl-1,3-butanediol, 1,3-butanediol, hexylene glycol, and the like. There is. Of these, 3-methoxybutanol and 3-methyl-3-methoxybutanol are preferably employed.
Such a main solvent can contain an auxiliary solvent excellent in compatibility.

In addition, in order to achieve various purposes and applications, a resin soluble in the solvent is added to the ink. For example, in order to achieve the purpose of adjusting the solid content, suppressing the abrasion of the nib, improving the fixing property and fixing property of the coloring material, adjusting the viscosity, improving the scratch resistance, and dispersing the pigment, there is a resin corresponding to the purpose. Added.
In other words, the type, molecular weight, and ink blending amount of the resin added to the ink is appropriately selected according to the purpose. Specific examples of such resins include ketone resins, styrene resins, styrene-acrylic resins, terpene resins including terpene phenol resins, rosin-modified maleic resins, rosin phenol resins, alkylphenol resins, phenol resins, styrene malees. Examples include acid resins, rosin resins, acrylic resins, urea aldehyde resins, maleic acid resins, cyclohexane resins, polyvinyl pyrrolidone, cellulose resins, and polyvinyl butyral.

(Procedure for manufacturing ball-point pen tip 20)
Next, a manufacturing procedure of the ballpoint pen tip 20 according to the first embodiment will be briefly described.
The ball-point pen tip 20 according to the first embodiment can be manufactured by any of the following manufacturing procedures (1) to (3).

Manufacturing procedure (1)
A first step of cutting to finish the ball house 31 formed on the ballpoint pen tip 20, a second step of forming the channel groove 43 in the ball house 31 finished in the first step, and a channel branch groove 44 in the ball house 31. A manufacturing procedure in which the third step of forming by pressing and the fourth step of inserting the writing ball 2A into the ball house 31 and crimping the tip of the holder 21 to form the crimped portion 22 are sequentially performed.

Manufacturing procedure (2)
A first step of performing a cutting process for finishing the ball house 31 formed on the ball-point pen tip 20, a second step of forming a channel branch groove 44 in the ball house 31 finished in the first step by a cutting process, and a channel in the ball house 31. A manufacturing procedure in which a third step of forming the groove 43 and a fourth step of inserting the writing ball 2A into the ball house 31 and crimping the tip of the holder 21 to form the crimped portion 22 in this state are sequentially performed.

Manufacturing procedure (3)
A first step of cutting to finish the ball house 31 formed on the ballpoint pen tip 20, a second step of forming the channel groove 43 in the ball house 31 finished in the first step, and a channel branch groove 44 in the ball house 31. A manufacturing procedure in which the third step of forming by punching and the fourth step of inserting the writing ball 2A into the ball house 31 and crimping the tip of the holder 21 to form the crimped portion 22 in this state are sequentially performed.

In addition, before performing the cutting process for finishing the ball house 31, a procedure for forming the channel groove 43 in the ball house 31 may be adopted. When this procedure is adopted, the manufactured ball-point pen tip 20 includes: There is no problem.
On the other hand, if the procedure for forming the channel branch groove 44 in the ball house 31 is adopted before the cutting process for finishing the ball house 31, cutting waste generated when the cutting process for finishing the ball house 31 is performed. May block the narrow channel branch groove 44 and hinder the flow of ink, so that sufficient lubricity may not be obtained.

According to the first embodiment as described above, the following effects can be obtained.
That is, a channel branch groove 44 carved in the seat surface 41 is provided along the circumferential direction from a substantially central portion of the edge 41A facing the channel groove 43 of the seat surface 41, and the channel branch groove 44 communicates with the channel groove 43. As a result, the ink can be supplied not only from the channel groove 43 but also from the channel branch groove 44 between the writing ball 2A and the receiving surface 41, and between the writing ball 2A and the receiving surface 41 can be supplied. Even if the receiving surface 41 for receiving the writing ball 2A can be enlarged, the ink supply amount can be increased, and even if the receiving surface 41 receiving the writing ball 2A is enlarged, a sufficient amount of ink is always applied to cover the entire receiving surface 41. Can be supplied during.
As a result, even if the seating surface 41 is enlarged, the entire seating surface 41 is always covered with ink, so that a so-called oil film is not cut out and writing can be performed smoothly and an excellent writing feel can be obtained. In addition, it is possible to enlarge the receiving surface 41 that receives the writing ball 2A, and the enlargement of the receiving surface 41 expands the holding range of the writing ball 2A by the receiving portion 40. At the time of writing, the writing ball 2A Can be held at a predetermined position of the ball house 31 to achieve a stable writing taste, and to achieve an excellent writing feeling and to achieve a stable writing taste. it can.

(Second Embodiment)
6 and 7 show a second embodiment of the present invention. That is, FIG. 6 is a cross-sectional view showing the main part of the ballpoint pen tip according to the second embodiment, and FIG. 7 is a plan view showing the seating surface according to the second embodiment.
In the second embodiment, the channel branch groove 44 that does not reach the opposite end edge 41 </ b> A at the position before the center of the seating surface 41 in the first embodiment is provided on the opposite side from the one seating surface 41. The channel branch groove 45 extends to the end edge 41A.
According to the second embodiment as described above, the same effects as those of the first embodiment can be obtained.

(Third embodiment)
8 and 9 show a third embodiment of the present invention. That is, FIG. 8 is a cross-sectional view showing the main part of the ballpoint pen tip according to the third embodiment, and FIG. 9 is a plan view showing the seating surface according to the third embodiment.
In the third embodiment, the channel branch groove 44 carved in the seating surface 41 along the circumferential direction in the first embodiment is replaced with the channel auxiliary groove carved in the seating surface 41 along the radial direction. It is replaced with 46.
Specifically, as shown in FIGS. 8 and 9, a channel auxiliary groove 46 communicating with the ink guide hole 35 is carved on each of the plurality of seating surfaces 41 provided in the ball house 31. .
Each of these channel auxiliary grooves 46 extends from the substantially central portion of the edge 41A facing the ink guide hole 35 of the receiving surface 41 to the middle of the receiving surface 41 in the radial direction. Yes.
Each channel auxiliary groove 46 has a width dimension and a depth dimension sufficient to circulate an amount of ink to be supplied between the writing ball 2 </ b> A and the receiving surface 41.
For example, when the diameter of the writing ball 2A is 0.7 mm, the width dimension of the channel auxiliary groove 46 can be 0.06 mm, and the depth dimension of the channel auxiliary groove 46 can be 0.06 mm.

According to the third embodiment as described above, the same effects as those of the first and second embodiments can be obtained.
That is, a channel auxiliary groove 46 is provided which is carved from the substantially central portion of the edge 41B facing the ink guide hole 35 of the receiving surface 41 to the middle of the receiving surface 41 in the radial direction. Since the ink is communicated with the ink guide hole 35, the ink can be supplied not only from the channel groove 43 but also from the channel auxiliary groove 46 between the writing ball 2A and the receiving surface 41. The amount of ink supplied to the surface 41 can be increased, and even if the receiving surface 41 that receives the writing ball 2A is enlarged, a sufficient amount of ink is always applied to cover the entire receiving surface 41. 2A and the receiving surface 41 can be supplied.
As a result, even if the seating surface 41 is enlarged, the entire seating surface 41 is always covered with ink, so that a so-called oil film is not cut out and writing can be performed smoothly and an excellent writing feel can be obtained. In addition, it is possible to enlarge the receiving surface 41 that receives the writing ball 2A, and the enlargement of the receiving surface 41 expands the holding range of the writing ball 2A by the receiving portion 40. At the time of writing, the writing ball 2A Can be held at a predetermined position of the ball house 31 to achieve a stable writing taste, and to achieve an excellent writing feeling and to achieve a stable writing taste. it can.

(Fourth embodiment)
10 and 11 show a fourth embodiment of the present invention. That is, FIG. 10 is a cross-sectional view showing the main part of the ballpoint pen tip according to the fourth embodiment, and FIG. 11 is a plan view showing the seating surface according to the fourth embodiment.
In the fourth embodiment, both the channel branch groove 45 in the second embodiment and the channel auxiliary groove 46 in the third embodiment are provided on the seating surface 41.
According to the fourth embodiment, the same effects as those of the first to third embodiments can be obtained.

(Fifth embodiment)
12 and 13 show a fifth embodiment of the present invention. That is, FIG. 12 is a cross-sectional view showing the main part of the ballpoint pen tip according to the fifth embodiment, and FIG. 13 is a plan view showing the seating surface according to the fifth embodiment.
In the fifth embodiment, the channel auxiliary groove 46 that does not reach the channel branch groove 45 in the fourth embodiment extends to the channel branch groove 45 and directly communicates with the channel branch groove 45. The groove 47 is used.
According to the fifth embodiment as described above, the same effects as those of the first to fourth embodiments can be obtained.

In addition, this invention is not limited to the said embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included.
For example, the ballpoint pen is not limited to a knock type that pushes in and out the pen tip by pressing a button provided at the rear end of the shaft tube, but the pen tip can be operated by rotating the rear end portion of the shaft tube. A rotary ballpoint pen can be used to take in and out, and a mechanism for taking in and out the pen tip can be appropriately selected in implementation.
Further, the ballpoint pen may be a ballpoint pen that does not have a mechanism for taking in and out the penpoint, such as a cap-type ballpoint pen in which a cap for concealing the penpoint is detachably provided.
Furthermore, the ballpoint pen is not limited to a single type of ballpoint pen with a single ballpoint pen refill in the shaft cylinder, but a compound type with two or more ballpoint pen refills in the shaft cylinder and a mechanical pencil refill in addition to the ballpoint pen refill. A ballpoint pen may be used.

DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Ball-point pen refill 2A Writing ball 2B Cylindrical body 3 Shaft cylinder 3A Front shaft part 3B Rear shaft part 3C Male thread part 3D Female thread part 3E Front end 3F Opening 3G Guide rib 3H Guide groove 3I Guide inclined surface 11 Rotor 11A Concave part 11B Key part 12 Button part 14 Coil spring 15 Spring receiving cylinder 20 Ballpoint pen tip 21A Pipe part 21B Taper part 21C Reduced diameter part 21 Holder 22 Caulking part 30 Hollow part 31 Ball house 32 Back hole 33 Small diameter part 34 Large diameter part 35A Peripheral 35 Ink guide Hole 40 Receiving part 41A End edge 41B End edge 41 Receiving surface 43A Inner side surface 43 Channel groove 44 Channel branch groove 45 Channel branch groove 46 Channel auxiliary groove 47 Channel auxiliary groove

Claims (6)

A writing ball to be transferred to the writing material;
This writing ball has a holder rotatably provided at the tip,
In the holder,
A ball house formed as a storage space for rotatably storing the writing ball;
A back hole extending from the rear end to the vicinity of the ball house;
An ink guide hole communicating the ball house and the back hole with each other;
A receiving portion that is formed around the ink guide hole on the inner surface of the ball house and has a receiving surface that contacts the surface of the writing ball; and a receiving portion that receives the writing ball on the receiving surface;
A plurality of channel grooves extending radially outward from the periphery of the ink guide hole to divide the seating surface of the seating portion and having inner surfaces on both sides in the stretching direction spaced apart from each other; Is a ballpoint pen tip,
A ballpoint pen tip having a channel branch groove that is carved in the seating surface along a circumferential direction from an edge of the seating surface facing the channel groove and communicates with the channel groove. . A writing ball to be transferred to the writing material;
This writing ball has a holder rotatably provided at the tip,
In the holder,
A ball house formed as a storage space for rotatably storing the writing ball;
A back hole extending from the rear end to the vicinity of the ball house;
An ink guide hole communicating the ball house and the back hole with each other;
A receiving portion that is formed around the ink guide hole on the inner surface of the ball house and has a receiving surface that contacts the surface of the writing ball; and a receiving portion that receives the writing ball on the receiving surface;
A plurality of channel grooves extending radially outward from the periphery of the ink guide hole to divide the seating surface of the seating portion and having inner surfaces on both sides in the stretching direction spaced apart from each other; Is a ballpoint pen tip,
A channel auxiliary groove is provided which is carved from the edge of the receiving surface facing the ink guide hole to the middle of the receiving surface in the radial direction and communicated with the ink guide hole. Ballpoint pen tip characterized by. A writing ball to be transferred to the writing material;
This writing ball has a holder rotatably provided at the tip,
In the holder,
A ball house formed as a storage space for rotatably storing the writing ball;
A back hole extending from the rear end to the vicinity of the ball house;
An ink guide hole communicating the ball house and the back hole with each other;
A receiving portion that is formed around the ink guide hole on the inner surface of the ball house and has a receiving surface that contacts the surface of the writing ball; and a receiving portion that receives the writing ball on the receiving surface;
A plurality of channel grooves extending radially outward from the periphery of the ink guide hole to divide the seating surface of the seating portion and having inner surfaces on both sides in the stretching direction spaced apart from each other; Is a ballpoint pen tip,
A channel branch groove carved in the seating surface along the circumferential direction from an edge of the seating surface facing the channel groove, and in communication with the channel groove;
A channel auxiliary groove is provided which is carved from the edge of the receiving surface facing the ink guide hole outward in the radial direction to the middle of the receiving surface and communicated with the ink guide hole. A ballpoint pen tip.   The ball-point pen tip according to claim 1, wherein the ink is an oil-based ink.   A ball-point pen refill comprising the ball-point pen tip according to claim 1.   A ball-point pen comprising the ball-point pen tip according to claim 1.