JPH0999693A - Double writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the writing tip end part to come in and out selectively by providing a projection formed in an inner cylinder with slits made in the axial direction in front of a top crown and being engaged with the spiral groove of a cylindrical cam, and also providing an eraser holder for holding an eraser and being slidable in the axial direction along the slits in the inner cylinder. SOLUTION: When the rear shaft 50 is rotated relative to the middle shaft 30, any writing body is selected by a cam slant face 35 accompanied by the rotation of a cylindrical cam 34 so that the writing tip end part can be projected from the tip end orifice of the tip end 52. Also, in the instance that the selected writing body is a writing body of a mechanical pencil, a refill is forwarded by knocking the rear end of the rear shaft 50. Besides, when an inner cylinder 43 is rotated by fingering a top crown 44 of the rear end and a clip 44a at the time of using an eraser, an eraser holder 47 is guided and withdrawn by the spiral groove 38 of the cylindrical cam and slit 45 of an inner cylinder 43, so that an eraser is delivered from the rear end. Accordingly, since the clip 44a can be fingered even where the top crown 44 is short, the eraser 56 can be moved in and out with ease.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil writing body, an ordinary oil-based ballpoint pen writing body, or a ballpoint pen writing body filled with an oil-based ballpoint pen ink of shear thinning viscosity and low viscosity. The present invention relates to a compound writing instrument that is installed.

[0002]

2. Description of the Related Art In general, there is known a double-type writing instrument having a plurality of writing objects such as a mechanical pencil and a ball-point pen mounted thereon so that a writing tip can be selectively protruded and retracted from an axis. In addition, as the mechanism of the writing tip of the double-type writing instrument,
Various types are known, such as a knock type, a slider type that alternately slides a slider that protrudes from a side surface of a writing barrel, and a cam type that rotates a cam cylinder having an inclined surface. In addition, the present applicant has published a Japanese Utility Model Application No. 60-12088.
As disclosed in Japanese Patent Application Laid-Open No. 9, there is a conventional dual writing implement in which a crown protruding from the rear end of a rear shaft is rotated to make an eraser appear and disappear. The conventional example has problems that metal parts are used in many parts, the structure is complicated, the number of parts is large, and the cost is high. In addition, since the rear shaft is longer than the front shaft, there is a problem in flexibility in design, and when the cursive body is retracted, one hand grasps the shaft tip and the other hand grasps the shaft rear end for rotation operation. There is a drawback in that it is not convenient to use. Also, since the crown is short, it is difficult to feed out the eraser.

On the other hand, when a medium-viscosity water-based and low-viscosity oil-based ballpoint pen is mounted on a double-sized writing instrument having a normal thickness due to a large ink container tube, the tip of the writing body protrudes without freedom between the writing bodies. The part is not smoothly centered on the tip hole of the barrel, and the operation is hindered, so that the writing tip cannot appear or disappear.
Therefore, there is a disadvantage that the shaft cylinder becomes extremely thick to enable the operation, and the portability and the usability are deteriorated.

[0004] Aqueous ballpoint pens have a low viscosity of several mPa · S or less, and therefore have the advantage of being able to be written with a light writing pressure, and are characterized by good writing taste. 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, in the conventionally known oil-based ballpoint pens, since the ink used has a high viscosity of several thousand mPa · S or more, the resistance when the ball rotates 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 can be considered. 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.

[0007] Since both the above-mentioned medium-viscosity aqueous ink and low-viscosity oil-based ink have low viscosities, there is a phenomenon that the ink easily flows backward or 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 a gel 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.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, that is, by mounting a plurality of writing bodies in a barrel, and writing each writing body from the tip of the barrel. An object of the present invention is to provide a compound writing instrument having a tip portion which can be selectively retracted and retracted, and which has an eraser feeding mechanism and is excellent in portability and usability. In addition, ink backflow and direct current phenomenon do not occur, the drying resistance of the pen tip is maintained, the cap can be removed and left, and drop impact, backflow of ink due to upward writing and direct current of ink are prevented. A medium-viscosity water-based, low-viscosity, oil-based ballpoint pen writing system having a mechanism
A plurality of cursive bodies having at least one ballpoint pen cursive body are mounted in the barrel so that the curl tip portions of the cursive bodies can be selectively retracted from the barrel tip. Also, it is possible to provide a convenient double-sided writing instrument that combines a ballpoint pen writing body that can be erased with an eraser and an eraser feeding mechanism.

[0010]

DISCLOSURE OF THE INVENTION The present invention is a compound writing instrument comprising a writing instrument mechanism having a plurality of writing instruments and an eraser feeding mechanism, and a center shaft provided between a front shaft and a rear shaft, A return spring, one end of which is locked to the center shaft and biases the writing body to the rear, a sliding piece attached to the rear portion of the writing body and biased to the rear by the return spring, and a sliding piece A cylindrical cam having a cam slant surface on the front surface for pressing any one of the rear ends of the cursive body to selectively advance the cursive body, and including an engaging portion which is engaged with the center shaft and is rotatable. A spiral groove is formed on the inner circumference of the rear part of the cylindrical cam, and a rear shaft is attached to the outer circumference of the rear part of the cylindrical cam so as to be rotatably fitted to the cylindrical cam and positioned at the rear end of the rear shaft. When a crown is provided and a clip is provided on one side surface of the crown An inner cylinder having a slit formed in the front axial direction of the crown portion, and a projection provided in the inner cylinder for engaging with the spiral groove of the cylindrical cam, and holding an eraser, The eraser holder is slidable in the axial direction along the slit.

The double-sided writing instrument of the present invention has a tip for holding the tip ball and an ink container in the rear, and the viscosity of the tip ball is lowered by the rotation of the tip ball accompanying the writing in the ink container. A water-based ball-point pen ink having a shear thinning property or a low-viscosity oil-based ink is filled, and a follower composed of a grease-like semitransparent non-drying substance that moves following the consumption of ink accompanying writing is filled at the rear end of the ink. In the ball-point pen writing body configured as described above, the ball-point pen writing body is a non-deformable one in which the ink storage portion of the ink storage tube has a relatively large cross-sectional area, and the tip and the ink storage portion are The connecting portion is configured to be easily displaceable in the lateral direction with respect to the axial direction, and a plurality of writing bodies including at least one of the ballpoint writing bodies are mounted to selectively write from each tip. And the tip retractable.

In a ballpoint pen writing body, the tip ball has a spring provided so that the tip ball always presses and closely contacts the inner edge of the ball holding portion at the tip of the tip, and the contact state is released during writing, or A ball receiving seat having the spring and a ball chamber in which a ball valve is loosely fitted in contact with the rear end of the chip and the ball valve is closely attached to the rear of the valve chamber to prevent backflow of ink, and the ball receiving seat. There is a guide hole that leads from the seat to the ink storage tube to prevent direct flow of ink, backflow, and blurring of writing.

In a ballpoint pen writing system, a crosslinking substance is added to an ink solvent, so that the tip ball is rotated during writing to form a sol and gel in a drawn state, which does not soak into paper and can be erased with an eraser. It is possible.

[0014]

1 to 5 show an embodiment of the present invention. In FIG. 1, two ballpoint pen cursive bodies 1
a 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 in the front part and an eraser feeding mechanism in the rear part. The compound writing instrument intended by the present invention is a ballpoint pen writing body filled with a so-called shear thinning water-based or low-viscosity oil-based ballpoint pen ink, a ballpoint pen writing body filled with an eraser-erasable ballpoint pen ink, and a mechanical pencil writing body. Ordinary oil-based ballpoint pen writing materials are used in combination as necessary.

The compound writing instrument of FIG. 1 comprises a front shaft 52 and a center shaft 30 for accommodating a writing mechanism mechanism located at the front part, and a rear shaft 50 for accommodating an eraser feeding mechanism at the rear part. A female screw 53 is formed on the inner periphery of the rear portion of the front shaft 3. 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 male screw 32 is screwed with the female screw 53 of the front shaft 52 and removed as necessary to replace the cursive body.
If equipped with a mechanical pencil cursive, refill the lead. Further, a stopper provided on the outer periphery of a cylindrical cam, which will be described later, is brought into contact with the rear end of the center shaft 30 to form a circumferential notch stopper for restricting the rotational position, and a rib for enabling the knocking operation of the cylindrical cam. A notch for fitting is formed. Further, a window 33 is formed in the rear side surface of the inner shaft 30 and four guide ribs 31 are formed in the inner periphery of the inner shaft 30 at intervals of 90 degrees in the axial direction. Are formed.

A return spring 5 for biasing the ballpoint pen writing bodies 1a and 1b rearward 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 inner 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 projection 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. Further, when the cylindrical cam 34 needs to be appropriately advanced (knocking operation of the mechanical pencil, etc.), the window 33 is formed in a length that does not hinder the operation of the engagement projection 37.

A spiral groove 38 is formed on the inner circumference 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 step portion 42 provided in the cylindrical cam 34, the inner cylinder 43, which will be 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, has a crown portion 44 at the rear end, and a clip 44a is formed on one side surface of the crown portion 44, and the crown 44 is formed. A long slit 45 is formed on the axial side surface in front of the crown portion so as to face the axial direction. The cylindrical cam 3 is attached to the tip of the inner cylinder 43.
4 is provided with a locking projection 46 for preventing slipping off which engages with the step 42 protruding inward. Further, when the inner cylinder 43 is assembled, the crown portion 44 is exposed from the rear end of the rear shaft 50 and serves as a rotation operation portion when the eraser is fed out. The eraser holder 47 is provided in the inner cylinder 43 and is provided with a protrusion 49 that engages with the spiral groove 38 of the cylindrical cam 34. The eraser holder 47 holds the eraser 56 and is provided along the slit 45 of the inner cylinder 43. The elastic piece 48 that can slide in the direction is provided.

In the above embodiment, the case of two cursive bodies has been described, but three cursives 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. In addition, 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, or a cross-linking substance is added to an ink solvent, and the tip ball is rotated during writing to form a sol, which is in a drawn state. It is an ink that can be erased with an eraser because it gels 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. Further, it is extremely important that the tip ball 12 is in close contact with the inner surface of the tip holding portion for the purpose of drying the writing tip and preventing direct current of the ink. For this reason, the surface roughness of the tip inner surface holding the tip ball and caulking The inner surface is ground to improve the close contact accuracy, and the secondary plastic working is performed to increase the crimping accuracy. In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.

Further, 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.

The ink container 17 is filled with the ink 18 of the above-mentioned ball-point pen, and the rear end of the ink 18 is a grease-like half that can move following the ink surface as the ink is consumed. A follower 19 made of a transparent non-drying substance 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 center 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.

FIG. 5 shows a compound writing instrument equipped with a mechanical pencil writing body 60 and a ball-point writing body 61 which is an ordinary oil-based ink. Basically, it is the same as that shown in FIG.

[0029]

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 selected writing body is a mechanical pencil writing body, the rear end of the rear shaft 50 is knocked to extend the lead. When using the eraser, the eraser holder 47 is guided by the spiral groove 38 of the cylindrical cam and the slit 45 of the inner cylinder 43 when the inner cylinder 43 is rotated by placing a finger on the crown portion 44 and the clip 44a at the rear end. Back and the eraser 56 is fed out from the rear end. That is, even if the crown portion 44 is short, since the finger can be hooked on the clip 44a, the eraser 56 can be easily retracted. In addition, when using the eraser, even if the eraser is strongly rubbed, the rear shaft and the clip are simultaneously held by the fingers, so that there is no problem that the eraser appears and disappears carelessly.

In a state where the tip 11 is turned upward, the ball valve 16 is positioned in the ball receiving seat 8 of the valve chamber 7 and seals the guide hole 9 in the ballpoint pen writing body 1a. Even if the ink immediately below the tip ball 12 runs out, the ink is caught by the head and does not flow backward. 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 is a channel (a tip ball receiving seat having ink inflow grooves penetrating toward the inner hole of the chip at a plurality of positions), and a 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.

[0033]

The structure and operation of the compound writing instrument of the present invention are as described above, and the flexibility of the design is satisfied, and the convenient compound writing instrument having the eraser feeding mechanism satisfies the portability and usability. It can be provided with the thickness of the shaft. In addition, it is equipped with a ballpoint pen writing material using water-based, low-viscosity oil-based ink with so-called shear thinning, no writing, no dark drawing, no writing scratches, and no need for a cap It is possible to appear and disappear, and it is possible to prevent accidents that stain the inside of the shaft cylinder, hands, clothes, and the like due to the direct current of ink, upward writing, knocking, and reverse flow of ink with respect to a drop impact.
In addition, it becomes possible to provide a combination of a ballpoint pen writing body, a mechanical pencil writing body, and the like using ink that can be erased with an eraser according to the specifications.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the entirety of a double-type writing instrument according to an embodiment of the present invention, which is partially shown in a non-cross-sectional view. In addition, two kinds of ballpoint pen cursives are mounted.

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 according to an embodiment.

FIG. 5 is a vertical cross-sectional view showing the entire compound writing instrument of one embodiment of the present invention, which is partially shown in non-cross section. In addition, a mechanical pencil and a ballpoint pen writing material of ordinary oil-based ink are mounted.

[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 Rib for guide 32 Male screw 33 Window part 33a Thick part 34 Cylindrical cam 35 Cam slope 36 Notch 37 Engagement protrusion 38 Spiral groove 39a Sliding Top 39b Sliding top 40a Protrusion 40b Protrusion 41a Receiving shaft 41b Receiving shaft 42 Step 43 Inner cylinder 44 Crown 44a Clip 45 Slit 46 Engagement protrusion 47 Eraser holder 48 Elastic piece 49 Protrusion 50 Rear shaft 51 Groove 52 Front shaft 53 Female Screw part 54 Rubber grip 55a Return spring 55b Return spring 56 Eraser 60 mechanical pencil cursive 61 ballpoint cursive 62 tubular core 63a sliding piece 63b sliding piece

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B43K 27/00 B43K 29/02 D 29/02 7/02 B

Claims (5)

[Claims] 1. A compound writing instrument comprising a writing instrument mechanism having a plurality of writing instruments and an eraser feeding mechanism, and a center shaft provided between a front shaft and a rear shaft, and one end of which is locked to the center shaft. A return spring for urging the writing body backwards respectively, a sliding piece attached to the rear portion of the writing body and urged backwards by the return springs, and either rear end of the sliding piece is pressed. A cylindrical cam having a cam slant surface for selectively advancing the cursive body on its front surface and having an engaging portion that is rotatable by engaging with the center shaft, and a spiral on the inner circumference of the rear portion of the cylindrical cam. A groove is formed, a rear shaft is attached to the outer periphery of the rear portion of the cylindrical cam, the rear shaft is rotatably fitted to the cylindrical cam, and the crown portion is located at the rear end of the rear shaft, and the ceiling. A clip is provided on one side of the crown, and the clip is attached in the front axial direction of the crown. It is provided with an inner cylinder having a rit and a protrusion provided in the inner cylinder to engage with the spiral groove of the cylindrical cam, and holds an eraser and slides in the axial direction along the slit of the inner cylinder. A compound writing instrument consisting of a possible eraser holder. 2. A so-called shear thinning viscosity in which a tip for holding the tip ball and an ink containing tube in the rear are provided, and the viscosity of the tip ball is reduced by the rotation of the tip ball as a result of writing to flow out of the ink containing tube. A water-based ballpoint pen ink or a low-viscosity oil-based ink is filled, and a follower made of a grease-like translucent non-drying substance that moves following the consumption of the ink accompanying writing is filled at the rear end of the ink. In the ball-point pen writing body, 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 the portion connecting the tip and the ink containing portion is a shaft. It can be easily displaced laterally with respect to the long direction, and a plurality of writing bodies including at least one of the ballpoint writing bodies can be mounted, and the tip end of each writing body can be selectively retracted from the tip of the shaft. The multiple writing instrument according to claim 1, wherein 3. A ball-point pen writing body, wherein the tip ball has a spring provided so that the tip ball is always pressed and brought into close contact with the inner edge of the ball holding portion at the tip of the tip, and the close state is released during writing. Claim 2 consisting of
Double writing instrument described. 4. A ball-point pen writing body, wherein a valve chamber in which a ball valve is loosely fitted is provided in contact with the rear end of the tip.
4. The double-sided writing instrument according to claim 3, wherein the ball valve is provided in the rear portion of the valve chamber so as to be in close contact with the ball valve seat for preventing backflow of ink, and a guide hole communicating from the ball seat to the ink containing tube. 5. In a ballpoint pen writing material, a cross-linking substance is added to an ink solvent to turn into a sol by the rotation of the tip ball accompanying writing, gel in the state of a drawn line, and it does not soak into paper, so it can be erased with an eraser. 5. The multiple writing instrument according to any one of claims 1 to 4.