JP3758796B2 - Double writing instrument - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a compound writing instrument that is equipped with a plurality of substantially non-deformable writing bodies so that each writing tip can be easily projected and retracted from a tip end of a shaft.
[0002]
[Prior art]
2. Description of the Related Art In general, there is known a compound writing instrument in which a plurality of writing bodies such as ballpoint pens are mounted and a writing tip portion can be selectively projected and retracted from an axis tip.
In addition, as for the mechanism of the writing tip of the double writing instrument, the knocking type, the slider type that alternately slides the slider that protrudes from the side surface of the shaft of the writing instrument, and the cam cylinder with an inclined surface are rotated. Various types such as a cam type are known.
In addition, since the conventional retracting mechanism has a built-in return spring for returning the writing body into the shaft cylinder, there is a problem that the structure is complicated, the number of parts is large, and the cost is high.
Moreover, the space for incorporating the mechanism is large, and the degree of freedom of the refill shape is small.
[0003]
On the other hand, the oil-based ballpoint pen with medium viscosity water and low viscosity has a thick ink storage tube, so when mounted on a double-sized writing instrument of normal thickness, the tip of the writing body that protrudes without flexibility between the writing bodies is the axis. The tube is not centered smoothly at the tip hole of the tube, and the operation is hindered, so that the writing tip portion cannot be projected and retracted. Therefore, there is a drawback that the shaft tube becomes extremely thick to enable the operation, and portability and usability are deteriorated.
[0004]
Conventional oil-based ballpoint pens have a high viscosity of several thousand mPa · S or higher, and the resistance when the ball rotates when ink flows out of the pen tip is high. There are bad drawbacks. In addition, there is a problem that the amount of ink flowing out from the tip during writing is small, there is a blurring phenomenon, the writing line is uneven, the handwriting density is low, and a high writing pressure is required.
As an improvement of this oil-based ballpoint pen, recently, a ballpoint pen for water-based ink called medium viscosity using the above-mentioned intermediate viscosity region (several mPa · S to several thousand mPa · S) of water and oil has been developed. This is a ballpoint pen using a relatively low-viscosity aqueous ink having a characteristic that the viscosity is lowered by rotation of the tip ball and the ink flows out smoothly, so-called shear thinning. However, since this ink has a drawback that the ink tends to dry, a cap for sealing the writing tip is usually required. Further, the amount of ink flowing out increases, and in order to extend the writing life, it is necessary to increase the ink filling amount by increasing the diameter of the ink containing tube.
[0005]
As an improvement of the above oil-based ballpoint pen, a ballpoint pen using a low-viscosity oil-based ink excellent in drying resistance is conceivable. However, the ink outflow amount increases, and the diameter of the ink containing tube is increased in order to extend the writing life. It is necessary to increase the ink filling amount by increasing the thickness. Also, due to the low viscosity of the ink, when the tip side is faced downward, if there is a gap between the tip ball and the chip holding part, the ink may ooze out (DC) or the amount of ink flowing out during writing will increase. There are drawbacks.
[0006]
Since both the above-mentioned medium viscosity water-based ink and low-viscosity oil-based ink are low-viscosity inks, there is a phenomenon in which the ink is liable to reverse flow or direct current. If ink causes reverse flow or direct current, there is a risk of soiling clothing. In addition, there is a drawback that writing curl is likely to occur due to dropping or knocking 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 storage tube, the problem of preventing ink evaporation is the problem of the pen tip, that is, the ball and holder What is necessary is to consider reducing evaporation from the gap. For example, if a solvent having a considerably low vapor pressure, such as an oil-based ballpoint pen, is mainly used, it is not necessary to consider ink evaporation.
[0007]
[Problems to be solved by the invention]
The object of the present invention is to solve the above-mentioned problems of the prior art, that is, by mounting a plurality of substantially non-deformable writing bodies in the shaft, the writing tip portion of each writing body can easily appear and disappear from the shaft tip opening. The object is to provide a dual-type writing instrument that is capable of portability and ease of use.
Also, using low viscosity ink, drop impact, ink backflow due to upward writing and direct current phenomenon of ink do not occur, ballpoint pen writing that can keep the nib dry resistance and can be left with the cap removed Make up the body,
It is possible to provide a convenient compound writing instrument having at least one ballpoint pen writing body and mounting a plurality of writing bodies in the shaft.
[0008]
[Means for Solving the Problems]
The present invention has the following configuration in order to achieve the above-described problems.
The compound writing instrument according to the invention of claim 1 is a compound writing instrument in which a plurality of writing bodies are mounted in the shaft, and each writing tip portion can be selectively projected and retracted from the tip opening. The body is substantially non-deformable and is inserted into the shaft without swinging, and the tip of the tip is connected to the base of the tip of the shaft by a bendable portion. When the protrusion protrudes, the tip portion is swung with respect to the base portion so as to protrude from the tip end portion.
[0009]
A compound writing instrument according to a second aspect of the present invention is the compound writing instrument according to the first aspect, wherein two types of ballpoint pens are mounted, and a front shaft, a rear shaft, and an inner hole of the rear shaft The rotary shaft is rotatably disposed within a range of about 180 degrees with respect to the rear shaft, and is fixed to the rotary shaft having a cam groove formed on the shaft peripheral surface and the rear end portion of the rotary shaft protruding from the rear end of the rear shaft. A pair of sliding pieces formed on the inner side where the operating body and the rotating shaft are held so as to be rotatable only with respect to the rear shaft, and the protrusions that engage with the cam grooves of the rotating shaft face each other. Each of the writing bodies is guided in the inner hole of the rear shaft so as to be movable only in the forward and backward direction, and interlocked with the sliding piece in front of each sliding piece. By rotating, each sliding piece moves back and forth alternately, and each cursive body moves back and forth.
[0010]
A dual writing instrument according to a third aspect of the present invention is the dual writing instrument according to the first aspect, wherein the dual writing instrument has a tip for holding the tip ball and an ink storage tube at the rear, the tip ball being the tip tip. It consists of a spring provided so that it is always pressed and in close contact with the inner edge of the ball holding portion, and is released so as to be released from the close state when writing. And a plurality of writing bodies including at least one ball-point pen writing body configured to be filled with a grease-like semi-transparent non-drying material that moves following the consumption of ink accompanying writing.
[0011]
A dual-type writing instrument according to a fourth aspect of the present invention is the dual-type writing instrument according to the third aspect, wherein a valve chamber in which a ball valve is loosely fitted in contact with the rear end of the chip is provided. At the rear of the chamber, a ball valve is provided in close contact with the ball receiving seat to prevent the backflow of ink, and a guide hole that leads from the ball receiving seat to the ink containing tube.
[0012]
【Example】
1 to 6 show an embodiment of the present invention. In FIG. 1, two ballpoint pens 1a and 1b are provided.
The dual writing instrument intended by the present invention requires a ball-point pen writing body filled with a low-viscosity ink such as a water-based or low-viscosity oil ink having a so-called shear thinning viscosity, a normal oil-based ball-point pen writing body, a mechanical pencil, etc. It is used in combination according to.
[0013]
The compound writing instrument of FIG. 1 includes a front shaft 49 and a rear shaft 30 that house a portion of the writing instrument mechanism positioned at the front, and an operating body 42 disposed at the rear end of the rear shaft. A female screw 49 b is formed on the inner periphery of the rear portion of the front shaft 49.
Further, a male screw 32 is formed at the front portion of the rear shaft 30, and is screwed with the female screw 49b of the front shaft 49, and is removed as necessary to replace the writing body.
The front shaft 49 has a base portion 49a at the rear and a tip portion 50 at the tip, and the front end of the base portion 49a and the rear end of the tip portion 50 are integrally connected by a bendable portion 50a such as a bellows. Even when the writing body is substantially undeformed and inserted into the shaft without swinging, the tip 50 is swung with respect to the base 49a when the writing tip protrudes, and It is possible to pierce from the tip 50b.
Further, as a bending means for the base part and the mouth part, for example, an accordion-like member or an elastic member such as rubber can be connected between them.
[0014]
Further, a rotation-preventing rib 30a for restricting the rotation range of the rotation shaft 33 described later is formed on the inner periphery of the rear end of the inner hole of the rear shaft 30 and has a step portion 30b. Four guide ribs 31 formed in the axial direction at intervals of 90 degrees are formed in the front inner periphery.
In addition, mountain-shaped bulged portions 39 are formed at three locations on the outer periphery slightly rearward of the rear shaft 30, and concave portions 40a and 40b are provided at the centers of the two bulged portions.
[0015]
The rotating shaft 33 has a small diameter portion 34 in front of the large diameter portion 36, and a helical cam groove 35 is formed on the peripheral surface of the small diameter portion 34. In addition, a shaft portion having a reduced diameter is provided behind the large-diameter portion 36, a projecting locking portion 37 is provided on the front outer periphery of the shaft portion, and a rotation stop groove 38 is provided at a required position on the rear end. . Further, a groove 36a for restricting the rotation of the rotary shaft 33 within a range of about 180 degrees between the rib 30a and the rear shaft 30 is provided on the peripheral surface of the large diameter portion 36.
If the rotation angle of the rotary shaft 33 is increased, there is an advantage that the rotation resistance is reduced and the operation is facilitated. However, an increase in the rotation angle results in an operation disadvantage. Therefore, the rotation angle is selected to be close to 180 degrees when the diameter of the shaft body is small, and close to 120 degrees when the diameter is large.
[0016]
The operating body 42 is formed by a crown 44 and a clip 44 extending forward from one side surface of the outer periphery of the crown 43. A ball portion 45 is provided on the inner side of the front end of the clip 44, a hole portion 43a is provided in front of the crown, a circumferential locking groove 42a is provided on the front peripheral surface of the hole portion, and a rotation-preventing rib is provided at a required position on the rear peripheral surface. 41 is provided.
[0017]
Insertion holes 48a and 48b are provided in front of the sliding pieces 46a and 46b, and locking portions 51a and 51b of inner ridges for fixing rear ends of ballpoint pen writing bodies 1a and 1b described later in the respective insertion holes. Is provided. Further, projections 47a and 47b are formed on the inner surface of the rear side thereof so that the respective sliding pieces move back and forth by the pressing of the cam groove 35 accompanying the rotation of the rotary shaft 33.
In addition, grooves 53a and 53b are provided on the outer circumferences of the sliding pieces 46a and 46b so as to engage with the guide ribs 31 of the rear shaft 30 by rotation.
Accordingly, the grooves 53a and 53b provided on the side surfaces of the sliding pieces 46a and 46b mesh with the guide ribs 31, respectively, to smoothly move the sliding pieces 46a and 46b back and forth. The cross-sectional shapes of the sliding pieces 46a and 46b are substantially D-shaped. Therefore, there is an advantage that a complicated configuration for attaching a guide tube having two guide grooves facing each other, which is well shown in the conventional example, is not required.
Further, the sliding pieces 46a and 46b are in contact with each other on the flat side, but in order to make the sliding between them more smooth, a guide projection 52b is provided on the sliding piece 46b, and a guide projection 52b is provided on the sliding piece 46a. A guide groove 52a to be inserted is provided.
[0018]
The rotary shaft 33 is inserted into the inner hole of the rear shaft 30 with the projections 47a and 47b of the sliding pieces 46a and 46b engaged with the cam groove 35, and the rear end of the large diameter portion 36 is the rear shaft. The operating body 42 is fixed to the rear end shaft portion of the rotary shaft 33 while being in contact with the step portion 30a.
At that time, the locking portion 37 engages with the locking groove 42a of the crown 43, and the rotation stopping groove 38 engages with the rotation stopping rib 41 of the crown, so that the rotary shaft 33 and the operating body 42 are fixed integrally. Thus, by rotating the operating body 42 with respect to the rear shaft 30, the rotary shaft 33 rotates, and at the same time, one sliding piece moves forward and the other sliding piece moves backward.
Further, the rear end portions of the ballpoint pen writing bodies 1 a and 1 b are fixed to the insertion holes 48 a and 48 b of the sliding pieces 46 a and 46 b, and the front shaft 49 is fixed in front of the rear shaft 30.
[0019]
When one of the cursives is a mechanical pencil, it is necessary to shift the rotation axis 33 in order to feed the lead. As a means for this, a return spring may be urged between the rear end of the rear shaft 30 and the inner stage of the operating body 42 so that the axial transition of the operating body is interlocked with the rotating shaft and the sliding piece.
[0020]
FIG. 6 is an embodiment showing different engagement states between the clip and the bulging portion provided on the rear shaft. Basically, it is the same as the above-described embodiment, and the differences will be described in the operation described later.
[0021]
Next, the ballpoint pen writing body 1a will be described. Note that the ballpoint pen writing bodies 1a and 1b have the same configuration, for example, different ink colors.
The ink applied to the ballpoint pen is a low-viscosity ink such as a water-based, low-viscosity oil-based ink having a so-called shear thinning viscosity.
[0022]
As shown in FIG. 5, the tip 10 is crimped so that the tip ball 11 is rotatably held with the tip ball 11 substantially in contact with a seat having a channel through which ink can flow. Further, a spring 13 is inserted into the inner hole portion of the tip 10, and the rear end of the shaft portion 12 of the tip is properly crimped so that the rear end of the spring 13 cannot be removed. Further, it is extremely important for the tip ball 11 to be in close contact with the inner surface of the chip holding portion for drying the writing tip and preventing direct current of ink. For this reason, the surface roughness and caulking of the tip inner surface holding the tip ball are important. In order to improve the accuracy of close contact, the inner surface is ground and secondary plastic working to increase the caulking accuracy is considered. In addition, surface treatment and the like are considered on the contact surface with the tip ball.
[0023]
The tip of the spring 13 is a linear rod shaft portion 14, and the tip of the rod shaft portion 14 abuts against the rear end of the tip ball 11 in a pressed state. The tip ball 11 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 10 by the pressing.
[0024]
Further, the joint 2 is formed with a front shaft portion 3 for crimping the shaft portion 12 of the chip 10 at the tip and a rear shaft portion 4 for crimping the front end of the ink containing tube 16.
In addition, a valve chamber 6 in which a ball valve 15 is loosely fitted is provided behind the inner hole portion of the front shaft portion 3, and a tapered or spherical ball receiving seat 7 and an axial center are appropriately provided behind the valve chamber 6. An eccentric guide hole 8 is provided, and the inner hole of the rear shaft portion 4 communicates with the inner hole of the ink containing tube 16. A groove is provided on one side of the inner wall of the valve chamber 6 so that ink flows in the axial direction. (Not shown) The loosely fitted ball valve 15 in the valve chamber 6 is in contact with a state biased to the rear end of the tip portion 12 of the tip when the tip 10 is faced downward to form an ink flow path. The ink in the ink storage tube flows through the guide hole 8 and through the groove and the ink flow path into the chip inner hole. On the contrary, in the upward state, the ball valve 15 abuts against the ball receiving seat 7 to obtain a function of preventing the back flow of ink.
[0025]
In addition, the ink storage tube 16 is filled with the ink 17 of the above ballpoint pen, and further, a grease-like translucent non-drying property that can be moved in contact with the ink surface at the rear end of the ink 17 as the ink is consumed. A follower 18 made of material is filled. Further, a resin-made follower rod 19 having a specific gravity substantially equal to that of the follower 18 is immersed in the follower 18 as necessary in order to prevent deformation due to dropping, knocking impact or the like. A tail plug 20 is fixed to the rear end of the ink containing tube 16, and a locking portion 51a of an insertion hole provided at the front portion of the above-mentioned sliding pieces 46a, 46b on the shaft portion of the rear end of the tail plug. , 51b is provided with a locking groove 22 that is detachably fixed. The tail plug 20 is provided with a ventilation groove 21 that communicates the inside of the ink containing tube 16 with the outside air.
For example, a transparent PP resin molded product or the like is used for the ink containing tube 16. Further, the ink containing tube 16 is selected from a material excellent in clear drainability. The ink storage tube may be formed integrally with the joint 2.
[0026]
Further, the ink containing portion of the ink containing tube 16 is a non-deformable one having a relatively large cross-sectional area. In the embodiment, the ink containing portion has a substantially D-shaped cross-sectional shape that can be inserted into the rear shaft 30 without waste. Yes. The ballpoint pen writing bodies 1a and 1b including the tip 10 and the joint 2 are substantially undeformed.
[0027]
[Action]
When the operating body 42 is rotated in one direction with respect to the rear shaft 30, the protrusions 47a and 47b of the sliding pieces 46a and 46b slide along the cam groove 35 as the rotating shaft 33 rotates, The sliding piece moves forward and the other moves backward, so that the writing tip of the forward writing body can swing the tip 50 and protrude from the tip 50b. That is, even if the ballpoint pen writing bodies 1a and 1b are not deformed, the tip portion 50 is flexibly changed, so that the operation is not hindered and the writing tip portion appears and exits smoothly from the tip port 50b.
[0028]
When one of the ballpoint pens 1a protrudes, the clip ball portion 45 is concealed by the concave portion 40a of the bulging portion 39 of the rear shaft as shown in FIGS. Make a state that can not be put in the breast pocket.
[0029]
Next, when the rotary shaft 33 is rotated, the sliding piece 46a moves backward, the writing tip of the ball-point pen writing body 1a is immersed in the lip 50, and the sliding piece 46b advances.
At that time, the writing tip portion is held in the mouth portion, and the clip corresponding to the state becomes the position 44a shown in FIG. 3 and can be easily inserted into the breast pocket or the like.
[0030]
When the rotating shaft 33 is further rotated, the sliding piece 46a is further retracted, the sliding piece 46b is further advanced, and the writing tip portion of the ballpoint pen writing body 1b protrudes from the tip opening 50b of the tip portion 50. The clip corresponding to the state becomes a position 44b shown in FIG. 3 and is concealed by the recessed portion 40b of the bulging portion, so that the clip 44 cannot be easily inserted into a breast pocket or the like. Further, the contact portion 36c of the groove 36a of the large-diameter portion 36 of the rotating shaft shown in FIG. 4 contacts the rib 30a of the rear shaft, and the other rotation is restricted.
[0031]
By the way, in the embodiment shown in FIG. 6 described above, an oblique locking recess 62 is provided in the bulging portion 61 of the rear shaft 60, and the bent tip portion 65 of the clip 64 is locked in the locking recess when the writing tip portion protrudes. The clip 62 is engaged with the clip 62 so that the clip cannot be inserted into the breast pocket or the like.
In addition, the shape of the clip is not limited to the shape of the embodiment. For example, if the locking recess is formed into a spherical groove, a dovetail groove, etc. Does not spread out, making a state where the clip cannot be inserted into the breast pocket etc. at all.
[0032]
The ball-point pen writing body 1a is written in an upward direction since the ball valve 15 is positioned on the ball seat 7 of the valve chamber 6 and seals the guide hole 8 in a state where the tip 10 is directed upward. Even if the ink on the back surface of the tip ball 11 runs out, the head is applied to the ink and does not flow backward. Therefore, when the chip 10 is turned downward, the ink can immediately flow out, and dripping is prevented by writing. (By the way, in the structure that does not have a ball valve, the ink works in the reverse flow direction when writing upwards, so air is entrained in the tip, and the ink does not follow immediately when writing downwards, causing drooling)
[0033]
In the writing state in which the tip 10 is directed downward, the ball valve 15 is in contact with one of the rear ends of the tip 10 and a flow path through which ink can flow into the tip 10 is formed on the other side. The ink 17 that has entered the valve chamber 6 from the storage tube 16 through the guide hole 8 is guided to the back surface of the tip ball 11.
In this state, the tip ball 11 is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 14, so that direct current of ink is prevented. In addition, the tip ball 11 is slightly retracted by the writing pressure, so that a gap is formed and ink can flow out. By writing, the tip ball 11 rotates smoothly and the ink flows out smoothly. It becomes.
[0034]
On the back surface of the tip ball 11, there is a channel (a tip ball receiving seat having a plurality of ink inflow grooves penetrating toward the chip inner hole), and a rod shaft portion 14 passes through the center hole of the channel. The ink in the chip is guided to the back surface of the tip ball 11 through the ink inflow groove and the gap between the center hole and the rod shaft portion 14.
[0035]
【The invention's effect】
The configuration and operation of the dual-type writing instrument of the present invention are as described above, and the tip of the substantially non-deformable writing body can be easily projected and retracted by swinging the mouth part, and the convenient dual-type writing instrument is portable and easy to use. Can be provided with a shaft thickness satisfying
In addition, it is equipped with a ballpoint pen that uses low-viscosity ink, which has no mottling, dark strokes, no wrinkles, no need for a cap, and allows the tip of the writing to appear, and the direct current or upward of the ink. Accidents that stain the inside of the shaft cylinder, hands, clothes, etc. due to the backflow of ink against writing, knocking and drop impact are prevented.
As another effect, the tip of the clip is concealed by the recess provided in the bulging portion only when the operating body is rotated and the writing tip protrudes from the tip opening of the tip. Alternatively, since the clip cannot be inserted into the breast pocket or the like at all, it is not inserted into the breast pocket or the like with the writing tip protruding, so that an accident of soiling clothes is prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an entire double writing instrument according to an embodiment of the present invention, and a part thereof is not shown in cross section. Two types of ballpoint pens are mounted.
2 is a cross-sectional view taken along the line CC in FIG. 1, and shows a state in which a writing body is not fixed to the sliding piece 46a.
FIG. 3 is a cross-sectional view taken along the line BB in FIG. Further, the position of the clip as the operating body rotates is shown.
4 is a cross-sectional view taken along the line AA in FIG. 1. FIG.
FIG. 5 is a longitudinal sectional view of a ballpoint pen writing body 1a.
FIG. 6 is a longitudinal sectional view showing a rear half part of a compound writing instrument which is a partially different embodiment, and a part thereof is shown in a non-cross section.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Ball-point pen writing body 1b Ball-point pen writing body 2 Joint 3 Front shaft part 4 Rear shaft part 5 Collar part 6 Valve chamber 7 Ball receiving seat 8 Guide hole 9 Inner hole part 10 Tip 11 Tip ball 12 Shaft part 13 Spring 14 Rod shaft part 15 Ball valve 16 Ink storage tube 17 Ink 18 Follower 19 Follower rod 20 Tail plug 21 Venting groove 22 Locking groove 30 Rear shaft 30a Rib 30b Step portion 31 Guide rib 32 Male screw 33 Rotating shaft 34 Small diameter portion 35 Cam groove 36 Thick Diameter portion 36a Groove 36b Abutting portion 36c Abutting portion 37 Engaging portion 38 Anti-rotation groove 39 Swelling portion 40a Concave portion 40b Recessing portion 41 Anti-rotation rib 42 Operating body 42a Engaging groove 43 Cap crown 43a Hole portion 44 Clip 44a Clip ( position)
44b Clip (position)
45 Ball part 46a Sliding piece 46b Sliding piece 47a Protruding part 47b Protruding part 48a Inserting hole 48b Inserting hole 49 Lead shaft 49a Original part 49b Female screw 50 Tip part 50a Bendable part 50b Tip opening 51a Locking part 51b Locking part 52a guide groove 52b guide projection 53a groove 53b groove 60 rear shaft 61 bulging portion 62 engaging recess 63 operating body 64 clip 65 tip portion

Claims (4)

In a multi-type writing instrument in which multiple writing bodies are mounted in the shaft, and each writing tip can be selectively projected and retracted from the tip opening, the writing body is substantially undeformed and swings in the shaft. The tip of the tip is connected to the base of the shaft tip by a bendable portion, and the tip of the tip is swung with respect to the base when the respective writing tip protrudes. A dual-type writing instrument that is configured to move and pierce from its tip. Two kinds of ballpoint pens are mounted, and the front shaft, the rear shaft, and the inner hole of the rear shaft are disposed so as to be rotatable within a range of about 180 degrees with respect to the rear shaft, and the cam groove is formed on the shaft peripheral surface. A rotating shaft formed with an operating body fixed to a rear end portion of the rotating shaft that protrudes from the rear end of the rear shaft, and the operating body and the rotating shaft are rotatably held with respect to the rear shaft. A pair of sliding pieces formed on the inner side where the protrusions that engage with the cam grooves of the shaft are opposed to each other are guided in the inner hole of the rear shaft so that they can only move back and forth, and slide in front of each sliding piece. Each cursive body is provided so as to be linked with the top, and each sliding top is moved back and forth alternately by the rotation of the rotating shaft accompanying the rotation of the operation body, so that the respective cursive body moves back and forth. The dual-type writing instrument according to claim 1, wherein It has a tip that holds the tip ball and an ink storage tube at the back, and 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 when writing The ink containing tube is filled with low-viscosity ink, and the trailing end of the ink is filled with a follower made of a grease-like translucent non-drying material that moves following the ink consumption accompanying writing. The compound writing instrument according to claim 1, comprising a plurality of writing bodies including at least one ballpoint pen writing body configured as described above. In the ballpoint pen writing body, a ball chamber in which a ball valve is loosely fitted in contact with the rear end of the chip is provided, and the ball valve is in close contact with the rear portion of the valve chamber to prevent backflow of ink and the ball receiver. The double writing instrument according to claim 3, wherein a guide hole is provided from the seat to the ink storage tube.

Images