JPH09188088A - Dual writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to know the ink residual amount even if a head barrel is not removed by forming the head barrel and an ink containing chamber of transparent resin molding, covering the outer periphery of the position grasped at the time of writing with the grip, and exposing the protruding window at the predetermined position of the grip disposed in the ink container. SOLUTION: A head barrel 52 and an ink containing chamber are formed of transparent resin molding. The outer periphery of the position grasped at the time of writing is covered with an opaque grip 54 made of soft elastic material. Further, the ring-like protruding window 52a of the barrel 52 is exposed with the predetermined position of the grip 54 disposed in the ink containers of ballpoint pen writing instruments 1a, 1b, and the ink residual amounts of the instruments 1a, 1b can be observed through from the windows 52a. Thus, even if the barrel is removed at each time, the ink residual amounts can be grasped to improve the handling operability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple writing instrument having a ballpoint pen writing body filled with a shear thinning water-based, low-viscosity oily ballpoint pen ink.

[0002]

2. Description of the Related Art A water-based ballpoint pen has a viscosity of several mPa · S.
Since it has the following low viscosity, it has an advantage that it can be written with a light writing pressure and has a characteristic that the writing feel is good. However, there is a drawback that a DC phenomenon in which the ink flows slowly from the pen tip, and a reverse flow phenomenon in which the air flows in from the tip of the ballpoint pen and the ink flows out, are likely to occur. A method of preventing these phenomena by using a fiber convergence material called batting is used. Also, if left in a cap-off state, there is a problem that the vapor pressure of the solvent is high and the solvent is leaked, so that the tip is dried and the ink does not flow out, making it impossible to write.

On the other hand, the conventionally known oil-based ballpoint pens have a high viscosity of several thousand mPa · S or more, so that the resistance when the balls rotate when the ink flows out from the pen tip. Has a drawback that the writing quality is bad because it is large. In addition, there is a problem that the amount of ink flowing out from the tip during writing is small, there is a battering phenomenon, there is uneven writing line, the handwriting density is low, and a high writing pressure is required.
As an improvement of the oil-based ballpoint pen, recently, an intermediate viscosity region (a few mPa · S to a few thousand mPa ·
A ballpoint pen for water-based ink, called medium viscosity, using the ink of S) has been developed. This is a ballpoint pen using a relatively low-viscosity water-based ink having a characteristic of lowering the viscosity by the rotation of the tip ball and smoothly flowing out the ink, that is, a so-called shear thinning property. However, since this ink has a defect that the ink is easily dried, a cap for sealing the writing tip is usually required. Further, the outflow amount of ink increases, and in order to extend the writing life, it is necessary to increase the diameter of the ink containing tube to increase the ink filling amount.

As an improvement of the oil-based ball-point pen, a ball-point pen using a low-viscosity oil-based ink having excellent drying resistance is conceivable. However, the amount of the ink flowing out is increased and the ink storage tube is required to extend the writing life. It is necessary to increase the diameter of the ink and increase the filling amount of the ink. Also, due to the low viscosity of the ink, if the tip side faces downward and there is a gap between the tip ball and the tip holding portion, the ink will bleed (DC) or the amount of ink flowing out during writing will increase. There are drawbacks.

Since both the above-mentioned medium-viscosity water-based ink and low-viscosity oil-based ink have low viscosities, there is a phenomenon that the ink is likely to flow back or generate direct current. If the ink causes backflow or direct current, there is a risk of soiling clothes and the like. In addition, there is a drawback that handwriting is apt to occur due to drop or knock impact. In addition, since a medium-viscosity water-based ballpoint pen is usually filled with a grease-like translucent non-drying substance called a follower at the rear end of the ink containing tube, the problem of ink evaporation prevention is a problem of the pen tip, that is, the ball and holder. It may be considered to reduce evaporation from the gap. For example, if a solvent with a fairly low vapor pressure such as an oil-based ballpoint pen is mainly used, ink evaporation does not need to be considered. However, in the case of water-based ink, since water is the main solvent, evaporation of water cannot be prevented only by selecting a low vapor pressure solvent.

Further, by utilizing the difference in the solubility of the rubber component in the ink solvent, it is gelled in the ink containing tube, becomes a sol by the rotation of the tip ball accompanying writing, gels in the drawn state, and does not soak into the paper. Erasable ink is known.

Further, there is known a multiple-type writing instrument in which a plurality of writing bodies such as a mechanical pencil and a ballpoint pen are mounted, and the writing tip end portion of which can be selectively retracted from a tip of a shaft. or,
The writing tip retracting mechanism of the compound writing instrument is a knock type mechanism, a slider type mechanism that slides the sliders protruding from the side surface of the writing instrument shaft alternately, and a cam barrel with an inclined surface is rotated. Various types such as a cam type are known.

Further, since a medium-viscosity water-based and low-viscosity oil-based ballpoint pen becomes thicker in an ink containing tube, when mounted on a compound writing instrument having a normal thickness, there is no freedom between the writing instruments and the tip of the writing instrument protruding. The portion is not centered smoothly in the tip hole of the barrel, and the operation is hindered, so that the writing tip cannot be projected or retracted.
Therefore, there is a disadvantage that the shaft cylinder becomes extremely thick to enable the operation, and the portability and the usability are deteriorated. Further, there is an inconvenience that the amount of ink remaining in each ballpoint pen writing body cannot be understood unless the leading axis is removed.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, that is, backflow of ink and direct current phenomenon do not occur, the drying resistance of the pen tip is maintained, and the cap is removed. It can be left as it is, and constitutes a medium-viscosity water-based, low-viscosity oil-based ballpoint pen writing body that has a mechanism to prevent drop impact, ink backflow due to upward writing, and ink direct current. It is mounted in multiple barrels so that the writing tip of each writing body can be selectively retracted from the barrel tip, and the remaining ink amount can be grasped without removing the tip axis, portability and usability. It is to be able to provide an excellent compound writing instrument.

[0010]

According to the present invention, there is provided a writing instrument comprising:
It is filled with water-based ball-point pen ink with so-called shear thinning viscosity or low viscosity oil-based ink, which is discharged by virtue of decrease in viscosity due to rotation of the tip ball accompanying writing, and further consumption of ink accompanying writing at the trailing end of ink. A multiple-type writing instrument that is equipped with a plurality of ballpoint pen writing bodies filled with followers composed of a grease-like semi-transparent non-drying material that moves following it, and that allows the tip of each writing body to be selectively retracted from the tip. In this case, the tip shaft and the ink storage tube are made of a transparent resin molded product, and the opaque grip made of a soft elastic material is coated on the outer periphery of the position gripped at the time of writing. The protruding window portion of the front shaft is exposed at a required position of the grip where the portion is located, and the ink remaining amount of each ballpoint pen writing body can be seen through the window portion.

The ball-point pen writing body is a non-deformable one in which the ink containing portion of the ink containing tube has a relatively large cross-sectional area, and each ink containing portion is fully inserted into the barrel. , The part connecting the tip and the ink storage part can be easily displaced laterally with respect to the axial direction,
Further, the tip ball is provided with a spring provided so as to be pressed and brought into close contact with the inner edge of the ball holding portion at the tip of the tip at all times and to be released from the close state during writing.

[0012]

1 to 5 show a first embodiment of the present invention. In FIG. 1, two ballpoint pen writing bodies 1a and 1b are provided. Incidentally, as will be described later, the embodiment of the present invention shown in FIG. 1 has a ballpoint pen writing body filled with a ballpoint pen ink that can be erased with an eraser. The compound writing instrument of the embodiment has a writing instrument function at the front,
Equipped with an eraser feeding mechanism at the rear. The compound writing instrument intended by the present invention is equipped with a plurality of ballpoint pen writing bodies filled with water-based or low-viscosity oil-based ballpoint pen ink having so-called shear thinning viscosity. Further, the eraser feeding mechanism is laid according to the type and the necessity of writing materials to be combined.

The compound writing instrument of the embodiment comprises a front shaft 52 and a center shaft 30 for accommodating a writing mechanism mechanism located at the front portion, and a rear shaft 50 for accommodating an eraser feeding mechanism at the rear portion. A female screw 53 is formed on the inner periphery of the rear portion of the front shaft 52. The rear shaft 50 has an opening at the rear end through which the eraser is fed. Further, a male screw 32 is formed on the small diameter portion of the front end of the center shaft 30, and the female screw 5 of the front shaft 52 is formed.
3 is screwed and removed as needed to replace the cursive body. Further, a stopper is formed in the shape of a notch on the periphery to regulate a rotational position by abutting a rib provided on the outer periphery of a cylindrical cam described later on the rear end of the center shaft 30. A window portion 33 is formed in the rear side surface of the center rod 30 (not shown), and four guide ribs 31 are formed in the inner periphery of the center rod 30 at intervals of 90 degrees in the axial direction. Are formed.

A return spring 5 for biasing the ball-point pen writing bodies 1a and 1b backward is provided on the front portion of the center shaft 30.
The front ends of 5a and 55b are locked. Then, the sliding shafts 39a, 39b are fitted to the receiving shafts 41a, 41 toward the front.
b is fixed by penetrating the inner holes of the return springs 55a, 55b, the rear ends of the ball-point pen writing bodies 1a, 1b are attached to the front ends of the receiving shafts 41a, 41b, and the rear ends of the return springs 55a, 55b are slidable pieces. 39a, 39
They are locked in front of b and are urged rearward. Further, the sliding pieces 39a, 39b have a cam surface which is advanced by the pressing of the cam slant surface 35 accompanying the rotation of a cylindrical cam described later and projections 40a, 40b at the rear ends thereof.

Further, the grooves 51 provided on the side surfaces of the sliding pieces 39a, 39b mesh with the guide ribs 31 provided inside the center shaft 30, respectively, so that the sliding pieces 39a, 39b
Move 39b back and forth smoothly. In addition, sliding pieces 39a, 3
The cross-sectional shape of 9b is substantially D-shaped. Therefore, there is an advantage that a complicated structure for mounting a guide cylinder having two opposing guide grooves, which is often shown in the conventional example, is not required.

Next, the cylindrical cam 34 is provided with a ring-shaped engagement protrusion 37 on its outer periphery, which engages with the center shaft 30 and is rotatable. Since the center shaft 30 has a pair of thick-walled portions 33a facing the rear portion and the window 33 is bored therein, when the front end of the cylindrical cam 34 is press-fit into the center shaft 30, the ring-shaped engagement projection 37 is inserted. At this time, the thick-walled portion 33a is pushed and fitted into the opening window portion 33 so that the cylindrical cam 34 is rotatably retained.

A spiral groove 38 is formed on the inner periphery of the rear portion of the cylindrical cam 34.
Are formed. Also, on the rear outer periphery of the cylindrical cam 34,
Grooves and ribs are formed between the rear shaft 50 and the inner periphery of the rear shaft 50 to prevent them from rotating. (Not shown) Further, by being locked to the stepped portion 42 provided in the cylindrical cam 34, the inner cylinder 43 described later is rotated but is prevented from coming off in the axial direction.

Further, the inner cylinder 43 is rotatably fitted to the cylindrical cam 34, and has a long slit 45 formed on its side surface so as to face in the axial direction. Also, at the tip of the inner cylinder 43,
A locking projection 46 is provided to prevent the stopper 42 from engaging with the step portion 42 extending inward of the cylindrical cam 34. Further, at the rear end of the inner cylinder 43, a crown 44 is formed which is exposed from the rear end of the rear shaft 50 when assembled and serves as a rotation operation portion when feeding out the eraser. Further, the eraser holder 47 is provided in the inner cylinder 43, and the spiral groove 3 of the cylindrical cam 34 is provided.
8 and a resilient piece 48 that holds the eraser 56 and is slidable in the axial direction along the slit 45 of the inner cylinder 43. In addition, in the above-mentioned embodiment, the case of two cursive bodies has been described, but three cursive bodies are also possible.

Next, the ballpoint pen writing body 1a mounted on the compound writing instrument of the present invention will be described. Note that the ballpoint pen writing bodies 1a and 1b have the same configuration, and have different ink colors, for example. The ink applied to the ballpoint pen writing material is a water-based, low-viscosity oil-based ink having a so-called shear thinning property. Further, it is an ink that can be erased with an eraser because it adds a cross-linking substance to the ink solvent, turns into a sol by the rotation of the tip ball accompanying writing, gels in the state of drawing, and does not soak into the paper.

As shown in FIG. 4, the tip 11 is crimped so that the tip ball 12 is rotatably held in a state where the tip ball 12 is substantially in contact with a seat having a channel into which ink can flow. . A spring 14 is inserted into the inner hole of the chip 11, and the rear end of the shaft 13 of the chip is appropriately caulked so that the rear end of the spring 14 cannot be pulled out. In addition, it is extremely important that the tip ball 12 is in close contact with the inner surface of the tip holding portion in order to dry the writing tip and to prevent direct current of ink. Therefore, the surface roughness of the tip holding the tip ball and the caulking In order to improve the close contact accuracy, grinding of the inner surface and secondary plastic working to increase the crimping accuracy are considered. In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.

The tip of the spring 14 becomes an upright rod shaft portion 15, and the tip of the rod shaft portion 15 has a tip ball 12.
Abuts on the rear end of the device in a pressed state. The tip ball 12 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 11 by its pressing.

The joint 2 has a shaft 1 of the tip 11 at the tip.
A front shaft 3 for pressing the third shaft 3 and a rear shaft 5 to be pressed against the front end of the ink storage tube 17 are formed. The space between the front shaft 3 and the rear shaft 5 is flexible, for example, a bellows 4 or the like. Is formed of a resin molded product connected to. A valve chamber 7 in which a ball valve 16 is loosely fitted is provided behind the inner hole of the front shaft portion 3, and a tapered or spherical ball receiving seat 8 is provided behind the valve chamber 7.
And a guide hole 9 provided eccentrically to the axis as appropriate.
The inner holes of the bellows 4 and the rear shaft portion 5 communicate with the inner holes of the ink storage tube 17. A groove is provided on one side of the inner wall of the valve chamber 7 so that ink flows in the axial direction. (Not shown)
The loosely fitted ball valve 16 in the valve chamber 7 is
In a state where 1 is turned downward, an ink flow path is formed in contact with a state biased to the rear end of the shaft portion 13 of the chip, and the ink in the ink storage tube passes through the guide hole 9 and passes through the groove, the ink flow path, etc. Through the chip inner hole. On the other hand, in the upward state, the ball valve 16 comes into contact with the ball receiving seat 8 to obtain a function of preventing the ink from flowing backward.

In addition, the ink 18 of the ball-point pen is filled in the ink containing tube 17, and the rear end of the ink 18 is a grease-like half which can move by contacting the ink surface as the ink is consumed. A follower 19 made of a transparent non-drying material is filled. Further, a resin follower rod 20 having a specific gravity substantially equal to that of the follower 19 is immersed in the follower 19 as needed in order to prevent deformation due to dropping or knocking impact. The ink containing tube 17 is, for example, a transparent PP resin molded product. Also, select the ink storage tube with a material with excellent clear drainage. Further, the ink containing tube 17 may be formed integrally with the joint 2.

Further, the ink containing portion of the ink containing tube 17 is a non-deformable one having a relatively large cross-sectional area, and in the embodiment, it has a substantially D-shaped cross-sectional shape to be inserted into the inner shaft 30 without waste. doing. The portion connecting the tip 11 and the ink storage portion can be easily shifted in the lateral direction with respect to the axial direction. It is also possible to connect a flexible tube between the joint for crimping the rear end of the chip 11 and the ink containing tube.

By the way, the above-mentioned front shaft 52 is made of a transparent resin molded product, and an opaque grip 54 made of a soft elastic material is coated on the outer periphery of a position to be gripped during writing,
Further, the protruding window portion 5 of the tip shaft 52 is provided at a required position of the grip 54 where the ink containing portions of the ballpoint pen writing bodies 1a and 1b are located.
2a is provided so as to be exposed, and the remaining ink amount of each of the ballpoint pen writing bodies 1a and 1b can be seen through the projecting window portion 52a.

In the first embodiment, as shown in FIG. 5, a ring-shaped protruding window portion 52a which divides the grip 54 is located at the tip of the ink containing portion when the ballpoint pen writing body is in the accommodated state. It is provided.

FIG. 6 and FIG. 7 show the second embodiment, in which the tip of the writing of any one of the ballpoint pen writing bodies is set to the front shaft 60.
A ring-shaped projecting window portion 61 that divides the grip 62 is provided at the leading end portion of the ink containing portion of the writing body in the state of protruding from the leading end of the writing body.

FIG. 8 and FIG. 9 show the third embodiment, which is a ring-shaped member for dividing the grip 72 at the tip of the ink containing portion when the ballpoint pen writing bodies 1a, 1b are contained. A protruding window portion 71b is provided, and in a state in which the writing tip of any one of the ballpoint pen writing bodies is projected from the tip of the tip shaft 70, the writing window is positioned at the tip of the ink containing portion of the writing body, and the grip is provided. Ring-shaped projecting window portions 71a for dividing 72 are provided side by side.

FIG. 10 shows the fourth embodiment, in which the projecting window portions 82a and 82b which allow the respective ink accommodating portions of the ballpoint pen writing bodies 1a and 1b to be independently seen through are grips 8.
It is provided for 1.

[0030]

When the rear shaft 50 is rotated with respect to the center shaft 30, one of the writing bodies can be selected by the cam slant surface 35 accompanying the rotation of the cylindrical cam, and the writing tip can be projected from the tip opening of the tip shaft 52. Becomes Further, even if the ink containing portion of the ball-point pen writing body is not deformed, the writing tip portion is flexibly displaced, so that the operation is not hindered and the writing tip portion smoothly appears and disappears from the tip opening of the tip shaft 52. When the eraser 56 is used with a erasable ball-point writing system, the eraser holder 47 rotates the spiral groove 38 of the cylindrical cam and the slit of the inner cylinder 43 when the crown 44 at the rear end of the inner cylinder 43 is rotated. The eraser 56 is fed out from the rear end while being guided by 45 and is retracted.

Since the ball valve 16 is located at the ball receiving seat 8 of the valve chamber 7 and seals the guide hole 9 in the state where the tip 11 is directed upward, the ball-point pen writing body 1a is written upward. Even if the ink immediately below the front end ball 12 is exhausted, the head is not caught by the ink and does not flow back. Therefore, when the chip 11 is turned downward, the ink can immediately flow out, and the writing is prevented from being rubbed. (By the way, in the structure without a ball valve, the ink acts in the reverse flow direction with upward writing, so that air is trapped in the tip,
The ink does not follow immediately with downward writing and blurring occurs)

In the writing state with the tip 11 facing downward, the ball valve 16 abuts on one side of the rear end of the tip 11 in a biased state, and the other side has a flow path through which ink can flow into the tip 11. Then, the ink 18 that has entered the valve chamber 7 from the ink containing pipe 17 through the guide hole 9 is guided to the rear end of the front ball 12. In this state, the tip ball 12 is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 15, so that the direct current of the ink is prevented. Also, since the tip ball 12 retreats slightly due to the writing pressure, a gap is created to allow the ink to flow out, and the writing allows the ink to flow out smoothly with the rotation of the tip ball 12, and it is possible to write with a high degree of handwriting density without fluffing. Becomes

Directly below the tip ball 12, there is a channel (tip ball receiving seat having ink inflow grooves penetrating toward the inner hole of the chip at a plurality of locations), and the rod shaft portion 15 penetrates the center hole of the channel. . The ink in the chip is guided directly below the tip ball 12 through an ink inflow groove and a gap between the center hole and the rod shaft portion 15.

[0034]

The constitution and operation of the present invention are as described above, and a plurality of ballpoint pen writing bodies using a so-called shear thinning water-based, low-viscosity oil-based ink are mounted, and there is no fluff. It is possible to provide a multiple-type writing instrument that has a deeply drawn line, is free from writing blur, and does not cause an accident that stains the inside of the barrel, hands, clothes, etc. due to direct current or reverse flow of ink. In addition, it is possible to provide a multiple-type writing instrument which has an appropriate thickness of the shaft body and is capable of grasping the ink remaining amount without removing the leading shaft one by one and which is excellent in portability and usability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entirety of a double-type writing instrument according to a first embodiment of the present invention, which is partially not shown in section.

FIG. 2 is a cross-sectional view of a sliding piece portion located on a center shaft.

FIG. 3 is a cross-sectional view of an ink-accommodating portion of a ball-point pen writing body located on the center axis.

FIG. 4 is a vertical cross-sectional view of a ballpoint pen writing material used in Examples.

FIG. 5 is a longitudinal cross-sectional view of relevant parts showing a tip shaft portion in a state where a ballpoint pen writing body is accommodated in the first embodiment.

FIG. 6 is a longitudinal cross-sectional view of a main portion showing a leading shaft portion in a state where a writing tip portion of one of the ballpoint pen writing bodies projects in the second embodiment.

FIG. 7 is a longitudinal cross-sectional view of relevant parts showing a tip shaft portion in a state where a ballpoint pen writing body is accommodated in the second embodiment.

FIG. 8 is a longitudinal cross-sectional view of a main portion showing a leading shaft portion in a state where a writing tip portion of one of the ballpoint pen writing bodies projects in a third embodiment.

FIG. 9 is a longitudinal cross-sectional view of a main portion showing a tip shaft portion in a state where a ballpoint pen writing body is stored in the third embodiment.

FIG. 10 is a transverse cross-sectional view of a tip shaft at a position of an ink containing portion of a ballpoint pen writing body according to a fourth embodiment.

[Explanation of symbols]

 1a Ballpoint pen writing body 1b Ballpoint pen writing body 2 Joint 3 Front shaft part 4 Bellows 5 Rear shaft part 6 Collar part 7 Valve chamber 8 Ball receiving seat 9 Guide hole 10 Inner hole part 11 Tip 12 Tip ball 13 Shaft part 14 Spring 15 Bar shaft Part 16 Ball valve 17 Ink storage pipe 18 Ink 19 Follower 20 Follower rod 30 Middle shaft 31 Guide rib 32 Male screw 33 Window 33a Thick portion 34 Cylindrical cam 35 Cam slope 36 Notch 37 Engagement projection 38 Spiral groove 39a Sliding Top 39b Sliding top 40a Protrusion 40b Protrusion 41a Receiving shaft 41b Receiving shaft 42 Step portion 43 Inner cylinder 44 Crown crown 45 Slit 46 Engaging protrusion 47 Eraser holder 48 Elastic piece 49 Protrusion 50 Rear shaft 51a Groove 51b Groove 52 Front shaft 52a Protrusion Window portion 53 female screw 54 grip 55a return spring 55 b Return spring 56 Eraser 60 Tip shaft 61 Projected window portion 62 Grip 70 Tip shaft 71a Projected window portion 71b Projected window portion 72 Grip 80 Tip shaft 81 Grip 82a Projected window portion 82b Projected window portion

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B43K 29/02 B43K 7/02 Z B

Claims (7)

[Claims] 1. A water-based ball-point pen ink having a so-called shear thinning viscosity or a low-viscosity oil-based ink, which is discharged by virtue of a decrease in viscosity due to rotation of a tip ball accompanying writing, is further written on the back end of the ink. Equipped with a plurality of ballpoint pen writing instruments filled with followers consisting of grease-like semi-transparent non-drying material that moves following the consumption of ink accompanying it, and selectively injects the tip of each writing instrument from the tip. In the possible double writing instrument, the tip shaft and the ink storage tube are made of a transparent resin molded product, and an opaque grip made of a soft elastic material is coated on the outer periphery of the position gripped at the time of writing. A double-sided writing instrument in which a protruding window portion of a tip shaft is exposed and provided at a required position of a grip where each ink containing portion of the body is located, and the ink remaining amount of each ballpoint pen writing body can be seen through the window portion. 2. A ball-point pen writing material is a non-deformed ink accommodating portion of an ink accommodating tube having a relatively large cross-sectional area, and each ink accommodating portion is fully inserted into a shaft cylinder. Therefore, the part that connects the tip and the ink storage part can be easily displaced laterally with respect to the axial direction.
2. The compound writing instrument according to claim 1, further comprising a spring provided so that the tip ball is always pressed against the inner edge of the ball holding portion at the tip of the tip to come into close contact therewith, and the close state is released during writing. 3. The compound writing instrument according to claim 1, wherein the tip shaft and the grip are integrally formed. 4. The compound writing instrument according to claim 1, further comprising a projecting window portion that allows each ink containing portion to be seen through independently. 5. The compound writing instrument according to claim 1, wherein a ring-shaped protruding window portion is provided at a tip portion of the ink containing portion of the ballpoint writing instrument. 6. The compound writing instrument according to claim 5, wherein the ballpoint writing material is stored. 7. The compound writing instrument according to claim 5, wherein the ballpoint writing instrument is in a protruding state.