JPH11115376A - Duplex writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount two kinds of ball point pen writing bodies forming an erratum correcting ball point pen in which at least one kind of bodies is not required to be agitated and the trouble of pressing the side face of a container or the like is not required either, form the diameter of a shaft cylinder satisfying the good handling properties and secure a space for building-in the writing bodies. SOLUTION: Titanium oxide, a white color pigment such as polymer hollow fine particles and a gelatinizing agent are contained at least in one kind of ball point pen writing bodies, and color pigment ink for preventing the precipitation of a pigment and not damaging fluidity is filled therein. A shaft cylinder composed of a front shaft 58 and an intermediate shaft 30 is formed into the long cylindrical shape, and a pair of sliding bodies 48a and 48b provided facing the long cylindrical longitudinal direction and provided on the shaft cylinder inner periphery almost in the inscribed state and a cam structure section for moving the sliding bodies alternately are provided and writing bodies are connected with front sections of respective sliding bodies, and ends of respective writing bodies appear and disappear from the end mouth of the shaft cylinder linked with the sliding bodies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is characterized in that at least one type of writing pen having at least one type of ballpoint pen for correcting typographical errors is mounted, and each writing tip can be alternately protruded and retracted from the tip opening by a rotation operation. It relates to the formed writing instrument.

[0002]

2. Description of the Related Art In general, there has been known a double-type writing instrument having a plurality of writing objects such as a ball-point pen mounted thereon so that a writing tip can be selectively protruded and retracted from an axis. In addition, as a retracting mechanism of the writing tip portion of the double-type writing instrument, a knocking type, a slider type that alternately slides a slider protruding from the side of the shaft cylinder of the writing instrument, and a cam cylinder having an inclined surface are rotated. Various types such as a cam type are known. The conventional retracting mechanism has a built-in return spring for returning the writing body to the inside of the barrel, so the structure is complicated and the number of parts is large,
There is a problem of high cost. Further, a liquid applicator using a white pigment to correct a typographical error or the like is known. Since the white pigment and the solvent are easily separated from each other, this type of liquid applicator has a flexible container in which ink, balls and the like are sealed, and it is necessary to shake and agitate the liquid applicator before use.
Further, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of the ink becomes small, even if the side wall of the container is strongly pushed, the ink is not ejected.

On the other hand, conventionally known oil-based ballpoint pens have a high viscosity of several thousands mPa · S or more of ink, so that the resistance to the rotation of the ball when the ink flows out of the pen tip is high. There is a drawback that writing is bad because of large size. In addition, there is a problem in that the amount of ink flowing out from the tip during writing is small, there is a dent phenomenon, the writing line is uneven, the writing density is low, and a high writing pressure is required. As an improvement of the oil-based ballpoint pen, recently, an intermediate viscosity region between the above-mentioned water-based and oil-based (from several mPa · S to several thousand mPa
A ballpoint pen for aqueous 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 drawback that the ink easily dries, a cap for sealing the writing tip is usually required. or,
The amount of outflow of ink increases, and it is necessary to increase the diameter of the ink storage tube to increase the filling amount of ink in order to extend the writing life.

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.

On the other hand, a medium-viscosity water-based or low-viscosity oil-based ballpoint pen having a shear thinning viscosity has a large degree of freedom between writing bodies when mounted on a double-sized writing instrument having a normal thickness due to a thick ink container tube. The protruding tip of the writing body 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 in order to enable the operation and the usability is deteriorated. Also, if the tip of the cursive writing is inserted into a pocket or the like while protruding, there is a risk that ink will be sucked out and the clothes will be stained.

[0006] 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, a medium-viscosity aqueous ballpoint pen is usually provided with a liquid-tight follower such as a grease-like translucent non-drying substance or silicone rubber at the rear end of the ink storage tube. That is, reduction of evaporation from the gap between the ball and the holder may be considered.
For example, if a solvent having a considerably low vapor pressure, such as an oil-based ballpoint pen, is mainly used, evaporation of the ink need not be considered.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a ballpoint pen for correcting a typographical error which does not require agitation, does not need to press the side surface of the container, and hassle-free attaching and detaching a cap. In addition, two types of ballpoint pen writing materials, at least one of which is a ballpoint pen for correcting a typographical error, are mounted in the barrel, and the writing tip of each writing body can be selectively protruded from the tip of the barrel. In addition, it is possible to provide a double-type writing instrument excellent in usability. In addition, there is no backflow of ink and no direct current phenomenon, the drying end of the writing tip is maintained, and it can be left without a cap. In addition, the backflow of ink due to drop impact and upward writing and the direct current of ink are prevented. In addition, it is possible to provide a double-type writing instrument that does not have a danger of soiling clothes and the like even if the writing tip is inserted into a pocket while protruding from the shaft tip.

[0008]

According to the first aspect of the present invention, there is provided a double-type writing instrument in which a tip ball is always pressed by a spring against an inner edge of a ball holding portion at a tip end of a tip and is in close contact with the tip. A tip provided to release the close contact state, and a non-deformed ink storage tube having a relatively large cross-sectional area in the ink storage portion at the rear, the ink storage tube being filled with ink, In a ball-point pen writing body provided with a follower that moves following the consumption of ink accompanying writing at the rear end, and a double-point writing tool having two kinds of the ball-point pen writing bodies, at least the ball-point pen writing body One type contains a white pigment ink such as titanium oxide and polymer hollow fine particles and a gelling agent, and is filled with a white pigment ink formulated so that sedimentation of the pigment is prevented and fluidity is not impaired. , Ahead And a pair of sliding bodies arranged in a substantially inscribed state on the inner circumference of the shaft cylinder facing the longitudinal direction of the long cylinder, and the sliding bodies are alternately formed. A writing mechanism is connected to the front of each sliding body, and a tip of each writing body can be protruded and retracted from a tip end of the barrel in conjunction with the sliding body.

[0009] According to a second aspect of the present invention, there is provided the double-sided writing instrument according to the first aspect, wherein a cylindrical portion is provided behind the long cylindrical portion of the center shaft, and an inner hole of the cylindrical portion is provided. A rotating shaft that is rotatably disposed within a range of about 180 degrees with respect to the center shaft and has a cam groove formed on the shaft peripheral surface, and a rotation that is fitted on the outer periphery of the cylindrical portion and protrudes from the rear end of the cylindrical portion. A rear shaft integrally provided at the rear end of the shaft, and a rear shaft rotatably held with respect to the center shaft, and protrusions engaging with the cam grooves of the rotary shaft are formed on the inside facing each other. The pair of sliding members are guided by the inner hole of the center shaft so as to be able to move only forward and backward, and the respective sliding members can be moved back and forth alternately by rotation of the rotating shaft accompanying rotation of the rear shaft.

[0010] According to a third aspect of the present invention, there is provided the double-type writing instrument according to the first aspect, wherein a cylindrical portion is provided behind the long cylindrical portion of the center shaft, and an inner hole of the cylindrical portion is provided. A rotating shaft that is rotatably disposed within a range of approximately 180 degrees with respect to the center shaft and has two protrusions formed in front of the shaft circumferential surface; A rear shaft integrally provided at the rear end of the rotating shaft protruding from the main shaft, and an inclined cam groove that is engaged with the protrusion of the rotating shaft so that the rear shaft is rotatably held with respect to the center shaft. A pair of sliding bodies formed on the inside facing each other are guided by the inner hole of the center shaft so that only the forward and backward movement is possible, and the sliding bodies can alternately move forward and backward by the rotation of the rotating shaft accompanying the rotation of the rear shaft.

According to a fourth aspect of the present invention, there is provided the double-type writing instrument according to the second and third aspects, wherein the middle cylindrical long cylindrical portion and the front of the rear shaft have substantially the same long cylindrical shape. An edge is provided on the side of the long diameter portion of the rear end of the long cylindrical portion of the middle shaft, and a clip is provided on one side surface of the short diameter portion of the rear shaft. In the protruding state, the front end in the longitudinal direction of the clip engages with the edge of the center shaft so that the clip cannot be attached to a pocket or the like. The front end of the clip is located at the short diameter portion at the rear end of the long cylindrical portion, and can be mounted in a pocket or the like.

[0012]

FIG. 1 to FIG. 7 show a first embodiment of the present invention. In FIG. 1, two kinds of ballpoint pen cursives 1
a and 1b are provided. The ink applied to at least one kind of ballpoint pen writing material contains a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent so that sedimentation of the pigment is prevented and fluidity is not impaired. It is a blended white pigment ink. The second type is usually a ballpoint pen writing material such as black or blue filled with a low-viscosity ink (a water-based or low-viscosity oil-based ink having a so-called shear thinning property).

The double-type writing instrument shown in FIG. 1 includes a front shaft 58 for accommodating the writing instrument mechanism, a center shaft 30, and a rear shaft 39 provided at the rear end of the center shaft. Also, the front end of the center shaft 30 and the front shaft 5
Engagement portions 32 and 59 are provided at the rear ends of 8, respectively, and they are engaged with each other to integrate the central shaft and the front shaft. Note that the shaft cylinder is composed of a front shaft and a rear shaft, and in a case where it is not necessary to replace the cursive writing, the front shaft and the rear shaft are an integral shaft cylinder.

The rear portion of the front shaft 58 and most of the center shaft 30 are formed in a long cylindrical shape. In addition, the long cylindrical portion 30d of the center shaft
Are formed as substantially flat flat portions 30f. Further, a cylindrical portion 30c is provided behind the long cylindrical portion 30d, and an edge portion 30e is formed on the side edge of the long diameter portion at the rear end of the long cylindrical portion 30d. Further, a rib 30a for preventing rotation is formed on the inner periphery of the rear end of the inner hole of the cylindrical portion 30c, which regulates the rotation range of the rotating shaft 33, which will be described later, and the step 30b is provided.
Four guide grooves 57 formed in the axial direction at 90-degree intervals are formed in the front inner peripheral portion of the cylindrical portion 30c. Also, four guide grooves 56 formed in the axial direction at 90 ° intervals from the rear end to the front end are formed in the inner peripheral portion of the long cylindrical portion 30d.

The rotary shaft 33 has a small diameter portion 3 in front of the large diameter portion 36.
The spiral 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, and a protruding locking portion 37 is provided on an outer periphery in front of the shaft portion.
A detent groove 38 is provided at a required position at the rear end.
A groove 36a is provided on the peripheral surface of the large-diameter portion 36 to regulate the rotation of the rotating shaft 33 between the central shaft 30 and the normal shaft 30 by engaging the rib 30a. (See FIG. 3) It should be noted that increasing the rotation angle of the rotation shaft 33 has the advantage of reducing the rotation resistance and facilitating operation. However, increasing the rotation angle increases the action, which is a disadvantage in operation. Become. Accordingly, the rotation angle is closer to 180 degrees when the diameter of the barrel is small, and 1 when the diameter is large.
It is selected for design reasons closer to 20 degrees.

The sliding members 48a and 48b are provided with tip portions 49a and
49b and the rear portions 50a, 50b, and the front portions 49a,
An insertion hole is provided in the shaft center of the front end of 49b, and bosses 54a, 54b are formed in the respective insertion holes, and rear end inner holes of ballpoint pen writing bodies 1a, 1b described later are fixed to the outer periphery of the boss. Have been. Vent grooves 55a, 55b are formed on the outer periphery of the bosses 54a, 54b, so that ventilation is possible in the rear end inner holes of the ballpoint pen writing bodies 1a, 1b, and behind the rear parts 50a, 50b. On the inner surface side, projections 51a and 51b are formed for each sliding body to move back and forth by the pressing of the cam groove 35 due to the rotation of the rotating shaft 33. Further, ribs 53a and 53b are provided on the outer periphery of the leading end portions 49a and 49b of the sliding body so as to stop and engage with the guide grooves 56 formed on the inner periphery of the long cylindrical portion 30d of the middle shaft. (The grooves and ribs between them may be replaced with each other.) In addition, the outer periphery of the rear portion 50a, 50b of the sliding body is also provided on the inner periphery of the cylindrical portion 30c of the center shaft for guiding. Ribs 52a, 52 which are detently engaged with the grooves 57
b is provided. (The grooves and ribs between them can be replaced with each other).
The ribs provided on the outer periphery of the sliding members 48a and 48b are engaged with the guide grooves provided on the inner periphery of the center shaft 30, respectively.
a, 48b are smoothly moved back and forth. Further, there is an advantage that a complicated structure for mounting a guide cylinder having two opposed guide grooves, which is often shown in the conventional example, is not required.

The rotating shaft 33 is provided with the sliding members 48a,
The projections 51a and 51b of the 48b are inserted into the inner hole of the center shaft 30 in a state of being engaged with the cam grooves 35, and the rear end of the large diameter portion 36 abuts on the step 30b of the center shaft, and The rear shaft 39 is fixed to the rear end shaft portion so as to be integrated therewith. That is, the locking portion 37 of the rotating shaft is provided with the locking groove 4 of the rear shaft 39 inner hole.
4, the detent groove 38 is engaged with the detent rib 40 at the rear end of the rear shaft inner hole, and the rotary shaft 33 and the rear shaft 39 are integrally fixed. As a result, the rotating shaft 33 rotates, with which one of the sliding bodies moves forward, and the other sliding body moves backward. The rear ends of the ballpoint pen writing bodies 1a, 1b are fixed to bosses 54a, 54b formed in the insertion holes of the sliding bodies 48a, 48b, and the front shaft 58 is fixed in front of the center shaft 30. In addition, if necessary, by setting the dimensions so that the writing body swings appropriately in the fixed state of the boss of the sliding body and the rear end of the writing body, even in the non-deformed writing body, it is easy to move in the centripetal direction. It can be displaced.

Further, the front of the long shaft portion 30d of the middle shaft and the rear shaft 39 is formed into a substantially cylindrical shape having substantially the same shape, and the edge portion 30e is provided on the side of the long diameter portion at the rear end of the long cylinder portion 30d as described above. And a clip 4 on one side surface of the flat portion 47 which is a short diameter portion of the rear shaft 39.
In the state where the tip of the cursive body protrudes from the tip end of the barrel, the tip 46 provided at the front end in the longitudinal direction of the clip engages with the edge 30e at the rear end of the center shaft, and The clip 45 cannot be attached to the pocket or the like, and the tip of the clip 45 is located on the flat portion 30f, which is the short diameter portion at the rear end of the center shaft, with the tip of the cursive body stored in the barrel. It is configured so that it can be attached to the camera.

FIGS. 8 and 9 show a second embodiment. Basically, it is almost the same as the first embodiment, and only the differences will be briefly described. A cylindrical portion 30c is provided behind the long cylindrical portion 30d of the central shaft 30. The cylindrical portion 30c is disposed in an inner hole of the cylindrical portion 30c so as to be rotatable within a range of about 180 degrees with respect to the central shaft 30, and a projection 71 is provided in front of the shaft peripheral surface. And a rear shaft 76 provided integrally with the rear end of the rotary shaft 70 fitted on the outer periphery of the cylindrical portion 30c and protruding from the rear end of the cylindrical portion.
And the rear shaft 76 is held rotatably with respect to the center shaft 30,
A pair of sliding bodies 72a and 72b formed on the inner sides of the cam shafts 73a and 73b, which engage with the protrusions 71 of the rotating shaft 70, are respectively guided inside the bore of the center shaft 30 so as to be able to move only forward and backward. The rotation of the rotating shaft 70 accompanying the rotation of the rear shaft 76 allows the sliding body to alternately move back and forth.

The tip portion 75 of the clip 74 provided on one side of the rear shaft 76 is slightly bent.
5 is configured to be engaged with the edge 30 e of the center shaft 30. A projection 77 formed on the peripheral surface of the rear shaft 76 is substantially in contact with the inner surface of the distal end portion 75.

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 materials 1a and 1b have the same configuration. For example, the first type is a ballpoint pen for correcting typographical errors, the second type is black for writing,
It is a blue pen etc. In addition, the ink applied to the writing pen for correcting typographical errors includes a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent as described above,
It is a white pigment ink formulated to prevent sedimentation of the pigment and not to impair the fluidity. The viscosity of the ink was 10,000 cps (E-type viscometer, 1 rpm, 25 rpm).
° C) or less, there is a tendency for pigment settling, and
If it is 0 cps or more, a problem occurs in ink ejection. Therefore, the viscosity of the ink is set in the middle range, and although it has a high viscosity, it has a shear thinning property, so that the coating can be applied with a high concealing property in combination with the decrease in the viscosity by the rotation of the tip ball. The ink applied to the ballpoint pen writing material is a medium-viscosity aqueous, low-viscosity oil-based ink having a so-called shear thinning property.

As shown in FIG. 7, the tip 11 is caulked so that the tip ball 12 is rotatably held with the tip ball 12 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. (Caulking portion 13a) Also, it is extremely important that the tip ball 12 comes into close contact with the inner surface of the tip holding portion for drying the writing tip and preventing direct current of the low-viscosity ink. Grinding of the inner surface to improve the surface roughness of the inner surface and close contact accuracy by caulking, and secondary plastic working to increase the caulking 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 close contact of the tip ball 12 with the inner surface of the ball holding portion is extremely important for drying the writing tip and preventing direct current of the ink even if it has a high viscosity like ink for correcting typographical errors. (In order to increase the amount of ink discharged, the ballpoint pen writing for correcting typographical errors is set to have a larger retreating dimension of the tip ball compared to the ballpoint pen writing for writing.)

Further, the tip of the spring 14 is a straight rod portion 15, and the tip of the rod portion 15 is
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 the pressing.

The joint 2 has a shaft 1 of the tip 11 at the tip.
A front shaft portion 3 for pressing the base 3 and a rear shaft portion 4 for pressing the front end of the ink storage tube 17 are formed. Further, behind the inner hole of the front shaft portion 3, there is a valve chamber 6 into which a ball valve 16 is loosely fitted.
Behind the valve chamber 6, a tapered or spherical ball valve receiving seat 7 and a guide hole 8 provided eccentrically to the axis are provided. Is in communication with A groove 10 is provided on one side of the inner wall of the valve chamber 6 so that ink flows in the axial direction. The ball valve 16 which is loosely fitted in the valve chamber 6 contacts the state where the tip 11 is directed downward to the rear end of the shaft portion 13 of the chip to form an ink flow path. The ink flows into the chip inner hole through the groove, the ink flow path, and the like through the guide hole 8. On the other hand, in the upward state, the ball valve 16 comes into contact with the ball receiving seat 7 to obtain a function of preventing the ink from flowing backward.

The ink container tube 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 body as a follower that can move in contact with the ink surface as the ink is consumed. A follower 19 made of a transparent non-drying substance is filled. In order to prevent deformation due to dropping, knock impact, etc., a resin follower rod 20 having a specific gravity substantially equal to that of the follower is provided in the follower 19 as necessary.
Is immersed. The ink storage tube 17 is made of, for example, a transparent PP resin molded product. Further, the ink container 17 is selected from a material having excellent clear drain properties. Further, the ink storage tube can be formed integrally with the joint 2.

FIG. 10 to FIG. 12 show another embodiment of a ballpoint pen writing body. As shown in the drawing, the tip 90 of the ballpoint pen writing body 80a is swaged so that the tip ball 91 is rotatably held with the tip ball 91 substantially in contact with the seat having the channel portion 92 into which ink can flow. Have been. (Ball holding portion 90a) The channel portion 92 will be described in detail.
The ball receiving seat 92 which comes into contact with the back of the
a spring seat 92 pressing the back surface of the tip ball 91 so that the tip ball 91 and the tip ball 91 come into close contact with the inner edge of the ball holding portion 90a.
b are radially and alternately arranged, and an ink inflow groove 92c is formed between the ball receiving seat 92a and the spring seat 92b so as to be able to supply ink from the rear end of the chip 90 to the tip ball 91. I have. As a method for pressing the back surface of the tip ball, as described in the first embodiment, a spring is provided in the inner hole of the chip and the tip ball is pressed at the tip, or the back surface of the tip ball is pressed against the front surface of the spring. In some cases, a piece having a rod shaft portion is interposed. According to the embodiment, since such members are omitted, the cost is superior. Also, in the case of high viscosity such as ink for correcting typographical errors, there is a possibility that the flow of the ink is hindered by the interposition of a spring or the like (the gap for the flow of the ink becomes small). The form becomes dominant.

Further, the tip ball 91 is moved to the ball holding portion 90a.
The close contact with the inner surface is extremely important for drying the writing tip and preventing direct current of the ink even if the ink has a high viscosity. (The ball-point pen writing body for correcting a typographical error is set to have a larger retreat size of the tip ball than the ball-point pen writing body for writing in order to increase the ink discharge amount.) In this embodiment, the tip 90 has Although a resin molded product excellent in spring property, abrasion resistance and ink sealing performance is assumed, when the tip 90 is made of metal, the surface roughness of the tip inner surface holding the tip ball 91 is particularly large. Consideration is given to the grinding of the inner surface in order to improve the close contact accuracy by caulking, and secondary plastic working to increase the caulking accuracy. In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.

The front end of the joint 81 is formed with a front shaft 82 for pressing the shaft 90b of the tip 90 and a rear shaft 83 for pressing the front end of the ink storage tube 94. A valve chamber 85 in which a ball valve 93 is loosely fitted is provided behind an inner hole 88 of the front shaft section 82, and a tapered or spherical ball valve receiving seat 86 and a shaft are provided behind the valve chamber 85. A guide hole 87 provided eccentrically to the center is provided, and an inner hole of the rear shaft portion 83 communicates with an inner hole of the ink storage tube 94. Also, the valve chamber 85
A groove 89 is provided on one side of the inner wall so that the ink 95 flows in the axial direction. The ball valve 93, which is loosely fitted in the valve chamber 85, forms an ink flow path in a state where the tip 90 is directed downward and is biased toward the rear end of the tip shaft portion 90b. The ink 94 flows into the chip inner hole through the groove 87 and the ink flow path through the guide hole 87. On the contrary, in the upward state, the ball valve 93 comes into close contact with the ball valve receiving seat 86, and the function of preventing the backflow of ink is obtained. This ink backflow prevention mechanism is not always necessary because the ink has a high viscosity and the tip ball is pressed so as to be in close contact with the inner surface of the ball holding portion of the chip. This is effective when the diameter of the accommodation pipe is large. In addition, since the ink has a high viscosity, the flow of the ink by the ball valve may be hindered, so that the clearance between the ball valve and the valve chamber and the sufficient ink flow path to the rear end of the chip are formed. Done. For this purpose, the ink backflow prevention mechanism is provided without being limited to the above structure.

The ink container tube 94 is filled with the ink 95 of the ballpoint pen, and the rear end of the ink 95 is a grease-like half body as a follower movable in contact with the ink surface as the ink is consumed. A follower 96 made of a transparent non-drying substance is filled. Further, in order to prevent deformation due to dropping, knock impact, or the like, a resin follower rod 97 having a specific gravity substantially equal to that of the follower is provided in the follower 96 as necessary.
Is immersed. The ink container 94 is selected from a material having excellent clear drain properties. As an example, a transparent PP resin molded product or the like is used, and the remaining amount of ink can be confirmed. Further, the ink storage tube can be formed integrally with the joint 81.

FIGS. 13 and 14 show another embodiment of the chip. As shown in the figure, the tip 100 fixes the channel member 102 into which ink can flow, and the tip ball 1 is held in a state where the tip ball 101 is substantially in contact with its seat.
01 is swaged so as to be held rotatably.
(Ball holding portion 100a) The channel member 102 will be described in detail. The channel member 102, which is fixed on the back surface of the tip ball 101 by the tip 100, is in contact with the ball receiving seat 102a when pen pressure is applied. And spring seats 102b for pressing the back surface of the tip ball 101 so that the tip ball 101 is in close contact with the inner edge of the ball holding portion 100a are arranged alternately in a radial pattern, and the ball receiving seat 102a and the spring seat 102b are provided. An ink inflow groove 102c that allows ink to be supplied to the tip ball 101 from the rear end of the chip 100 is formed between the ink supply groove 102c and the tip 100. The tip 100 used for the ballpoint pen writing material is assumed to be made of metal, and the channel member 102 is assumed to be made of resin or metal.

[0031]

First, the first embodiment will be described. Center axis 30
When the rear shaft 39 rotates in one direction, the sliding members 48a,
The projections 51a, 51b of 48b slide along the cam groove 35 with the rotation of the rotating shaft 33, and one of the sliding pieces moves forward and the other retreats, and the writing tip of the writing body on the forward side. The part can be made to protrude from the front end port of the front shaft 58.
Also, even if the ink storage portion of the ballpoint pen writing body is not deformed, the writing tip portion can be shifted in the centripetal direction with respect to the tip opening, and the tip shaft changes to a long cylindrical shape until it reaches the tip opening. As a result, the writing tip smoothly comes out of the tip end of the front shaft 58 without hindering the operation.

When the ballpoint pen writing body 1a protrudes, the distal end of the clip 44 is engaged with the edge 30e of the center shaft as shown in FIG. 1, so that the clip cannot be inserted into a pocket or the like. Make a state. Next, when the rotary shaft 33 is rotated, the sliding body 48a is retracted, and the writing tip of the ballpoint pen writing body 1a is immersed in the front shaft 58, and the sliding body 48a is rotated.
b moves forward. At this time, the writing tip is brought into a portable state accommodated in the tip shaft 58, and the clip for that state is at the position shown in FIGS. 5 and 6, and can be easily inserted into a pocket or the like. When the rotating shaft 33 is further rotated, the sliding body 48a is further retracted, and the sliding body 48b is further advanced, so that the writing tip of the ballpoint pen writing body 1b projects from the tip opening of the front shaft 58. At this time, the tip of the clip 44 is reengaged with the edge 30e of the center shaft, creating a state where the clip cannot be inserted into a 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. 3 abuts on the rib 30a of the rear shaft to regulate the other rotation.

The second embodiment is basically the same, and the description of the operation is omitted. As described above, according to the embodiment of the present invention, since the shaft cylinder is formed in the shape of a long cylinder, it becomes apparently thick, but since the short diameter portion is gripped and written, the usability is not inferior at all.

In the state where the tip 11 is turned upward, the ball valve 16 of the ballpoint pen writing body 1a is positioned on the ball valve receiving seat 7 of the valve chamber 6 and seals the guide hole 8, so that the writing is performed upward. Even if the ink on the back surface of the tip ball 12 of the chip is depleted, 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 backward direction when writing upwards, so that air is trapped in the chip and the ink does not follow immediately when writing downwards, causing scuffing.)

In the writing state in which the tip 11 is directed downward, the ball valve 16 abuts on one of the rear ends 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 6 from the ink storage pipe 17 through the guide hole 8 is guided to the back of the tip 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. In addition, the tip ball 12 slightly retreats due to the writing pressure, so that a gap is created and ink can flow out. By writing, the rotation of the tip ball 12 allows the ink to flow smoothly, and there is no dent and writing with high handwriting density is possible. Becomes In addition, in the case of correcting a typographical error, the tip ball 12 slightly retreats due to the writing pressure, so that a gap is created and ink can flow out. By writing, the viscosity is reduced by the rotation of the tip ball 12, and the ink flows out smoothly. Correction of concealable typographical errors becomes possible. A channel (a receiving seat for the tip ball having a plurality of ink inflow grooves penetrating toward the inner hole of the chip) is provided on the back surface of the tip ball 12, and a rod shaft portion 15 passes through a center hole of the channel. The ink in the chip is guided to the back of the tip ball 12 through the ink inflow groove and the gap between the center hole and the rod shaft portion 15.

An embodiment of the ballpoint pen writing body 80a will be described. First, in a writing state in which the chip 90 is directed downward, the ball valve 93 abuts on one of the rear ends of the chip 90 in a state of being biased, and the other side has a flow path through which ink can flow into the chip 90. The ink 95 that has entered the valve chamber 85 from the ink storage tube 94 through the guide hole 87 is guided to the back of the tip ball 91. Further, since the tip ball 91 is brought into close contact with the inner edge of the ball holding portion 90a of the chip by the pressing of the spring seat 92b, the direct current of the ink is prevented. Further, since the tip ball 91 is slightly retreated by the writing pressure, a gap is generated and ink can flow out, and the viscosity is reduced by rotation of the tip ball 91 by writing, so that the ink flows out smoothly.

[0037]

The construction and operation of the double-type writing instrument of the present invention are as described above. At least one type of ballpoint pen writing body having at least one type of ballpoint pen for correcting a typographical error is mounted in the barrel, and the tip of the barrel is provided. Therefore, a double-type writing instrument in which the writing tip of each writing body can be selectively protruded and retracted can be provided with a shaft thickness that satisfies the manufacturing cost and ease of use. In addition, such a refill of a ballpoint pen for a desk of this type has an effect that compatibility can be provided as a writing body of a double-type writing instrument. Further, it is possible to provide a ballpoint pen for correcting a typographical error that does not require stirring and does not bother pressing the side surface of the container. In addition, there is no backflow of ink and no direct current phenomenon, the drying end of the writing tip is maintained, and it can be left without a cap. In addition, the backflow of ink due to drop impact and upward writing and the direct current of ink are prevented. In addition, it is possible to provide a double-type writing instrument that does not have a danger of soiling clothes and the like even if the writing tip is inserted into a pocket while protruding from the shaft tip.

[Brief description of the drawings]

FIG. 1 is a vertical cross-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 cross-section. In addition, two kinds of ballpoint pen cursives are mounted.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a sectional view taken along the line CC in FIG. 1;

FIG. 5 is a front view illustrating an appearance of a main part of the dual-type writing instrument according to the first embodiment of the present invention in a state where a writing tip is housed in a barrel.

FIG. 6 is a top view corresponding to FIG. 5;

FIG. 7 is a longitudinal sectional view of the ballpoint pen writing body 1a.

FIG. 8 is a longitudinal sectional view showing the entirety of the double-type writing instrument according to the second embodiment of the present invention, which is partially shown in a non-sectional view.

FIG. 9 is a sectional view taken along line DD in FIG. 8;

FIG. 10 is a longitudinal sectional view showing the entirety of a ballpoint pen writing body 80a according to another embodiment of the present invention.

FIG. 11 is an enlarged sectional view of a tip end portion shown in FIG. 10;

12 is a cross-sectional view of the channel portion of the chip shown in FIG. 11 slightly in front of the channel portion.

FIG. 13 is an enlarged sectional view of a tip end portion of another embodiment.

14 is a cross-sectional view of the channel member of the chip shown in FIG.

DESCRIPTION OF SYMBOLS 1a Ball-point pen writing body 1b Ball-point writing body 2 Joint 3 Front shaft part 4 Rear shaft part 5 Flange part 6 Valve chamber 7 Ball valve receiving seat 8 Guide hole 9 Inner hole part 10 Groove 11 Tip 12 Tip ball 13 Shaft Part 13a Caulking part 14 Spring 15 Bar shaft part 16 Ball valve 17 Ink storage tube 18 Ink 19 Follower 20 Follower rod 30 Center shaft 30a Rib 30b Step 30c Cylindrical part 30d Long cylindrical part 30e Edge 30f Flat part 32 Engagement part 33 Rotation Shaft 34 Small-diameter portion 35 Cam groove 36 Large-diameter portion 36a Groove 36b Contact portion 36c Contact portion 37 Lock portion 38 Detent groove 39 Rear shaft 40 Rotation stop rib 41 Hole portion 42 Lock groove 43 Base portion 44 Clip 45 Ball portion 46 Tip 47 Flat 48a Sliding 48b Sliding 49a Tip 49b Tip 50a Rear 50b Rear 51a Projection 51b Projection 52a Rib 52b Rib 53a Rib 53b Rib 54a Boss 54b Boss 55a Vent groove 55b Vent groove 56 Guide groove 57 Guide groove 58 Front shaft 59 Locking unit 70 Rotating shaft 71 Projection 72a Slider 72b Slider 73a Cam groove 73b Cam groove 74 Clip 75 Tip 76 Rear shaft 77 Projection 80a Ballpoint pen 81 Joint 82 Front shaft 83 Rear shaft 84 Flange 85 Valve chamber 86 Ball valve seat 87 Lead hole 88 Inner hole 89 groove portion 90 tip 90a ball holding portion 90b shaft portion 91 tip ball 92 channel portion 92a ball receiving seat 92b spring seat 92c ink inflow groove 93 ball valve 94 ink storage tube 95 ink 96 follower 97 follower rod 100 chip 100a ball holding portion 101 Tip Ball 102 channel member 102a ball receiving seat 102b spring seat 102c ink inflow groove

Claims (4)

[Claims] 1. A tip provided with a tip ball which is always pressed by a spring to be in close contact with the inner edge of a ball holding portion at the tip end of the tip, and which is released by writing pressure during writing, and a tip provided with ink. The container has a non-deformable ink storage tube having a relatively large cross-sectional area, the ink is filled in the ink storage tube, and the rear end of the ink moves following the consumption of ink accompanying writing. In a ball-point pen writing body provided with a body and a double-type writing instrument having two kinds of the ball-point pen writing bodies mounted, at least one of the ball-point pen writing bodies is gelled with a white pigment such as titanium oxide or polymer hollow fine particles. Containing white pigment ink, which contains an agent and prevents sedimentation of the pigment and prevents loss of fluidity. The barrel composed of the front shaft and the central shaft has a long cylindrical shape. Is a long cylinder A pair of sliding members arranged in a substantially inscribed state on the inner periphery of the shaft cylinder facing in the longitudinal direction of the shaft member, and a cam mechanism for alternately moving the sliding members back and forth. A dual-purpose writing instrument to which a writing body is connected and in which the tip of each writing body can be protruded and retracted from a tip end of a barrel in conjunction with a sliding body. 2. A cylindrical portion is provided behind the long cylindrical portion of the center shaft,
A rotating shaft having a cam groove formed in the inner surface of the cylindrical portion and being rotatable at an angle of about 180 degrees with respect to the center shaft, and having a cam groove formed on a circumferential surface of the cylindrical portion; A rear shaft integrally provided at the rear end of the rotary shaft protruding from the rear end of the rotary shaft, and a protrusion that is held rotatably with respect to the center shaft and engages with the cam groove of the rotary shaft. A pair of sliding bodies formed on the inside facing each other are guided by the inner hole of the center shaft so that only the forward and backward movement is possible, and each sliding body can be moved back and forth alternately by the rotation of the rotating shaft accompanying the rotation of the rear shaft. The double writing instrument according to claim 1, wherein the writing instrument is configured. 3. A cylindrical portion is provided behind the long cylindrical portion of the central shaft,
The rotary shaft, which is rotatably disposed in the inner hole of the cylindrical portion at an angle of about 180 degrees with respect to the center shaft, and has projections formed at two places in front of the shaft circumferential surface, is fitted on the outer periphery of the cylindrical portion. And a rear shaft integrally provided at the rear end of the rotary shaft protruding from the rear end of the cylindrical portion, and the rear shaft is rotatably held with respect to the center shaft and engages with the protrusion of the rotary shaft. A pair of sliding bodies, each having an inclined cam groove formed on the inside facing each other, are guided by the inner hole of the center shaft so that only the forward and backward movement is possible, and the sliding bodies alternately move forward and backward by the rotation of the rotating shaft accompanying the rotation of the rear shaft. The dual writing instrument according to claim 1, wherein the writing instrument is configured to be capable of being used. 4. A long cylinder portion of the middle shaft and a front portion of the rear shaft are formed in substantially the same shape of a long cylinder, an edge portion is provided at a side edge of a long diameter portion at a rear end of the long cylinder portion of the middle shaft, and a short diameter of the rear shaft is provided. A clip is provided on one side of the portion, and in a state in which the tip of the cursive writing protrudes from the tip opening of the barrel, the front end in the longitudinal direction of the clip is engaged with the edge of the center shaft to fit the clip into a pocket or the like. Mounting is not possible, and the tip of the clip is located at the short diameter at the rear end of the long cylinder of the middle shaft with the tip of the cursive body stored in the barrel, and it can be attached to pockets etc. 4. The double writing implement according to claim 2, wherein the writing instrument is configured to be formed as follows.