JP2000263992A - Ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a stirring and a pressing of the container side surface by filling a white pigment ink wherein titanium oxide and a white pigment such as a polymeric hollow particle, and a gelling agent are blended, in an ink housing tube, and at the same time, arranging a follower which follows the ink, at the ink rear end. SOLUTION: In an ink housing tube 2 of this ballpoint pen 1, a white pigment ink 9 is filled, and at the same time, a grease-form follower 10 which follows the ink accompanying the consumption of the ink, is filled at the ink rear end. The white pigment ink 9 contains at least titanium oxide and a white pigment such as a polymeric hollow particle, and a gelling agent, and they are blended in such a manner that the pigment may be prevented from sinking, and at the same time, the flowability may be prevented from being spoiled as much as possible. The follower 10 does not have a compatibility with the ink, and also, prevents the ink from vaporizing. By this constitution, the white pigment and a solvent are prevented from being separated, and at the time of usage, the ballpoint pen can be used without stirring the ink, and also, without pressing the side surface of the container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball-point pen or an eraser which is capable of correcting an erroneous character or the like constituted so that the outflow of ink is assisted by a pressurizing means using writing pressure, by concealing the ink with white ink. The present invention relates to a ballpoint pen that can be erased by using a pen.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid applicator using a white pigment in order to correct a mistake or the like. In addition, since a white pigment and a 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, a ballpoint pen using an ink which is formed by adding a cross-linking substance to an ink solvent, turning into a sol by the rotation of a tip ball during writing, gelling in a drawn line state, and not penetrating into paper, so that it can be erased with an eraser is known. This ballpoint pen also has a problem that it tends to settle because the pigment particles are coarse.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a ballpoint pen for correcting errors such as erroneous writing or a ballpoint pen which can be erased with an eraser without the need to stir and to press the side of the container. It is in.

[0004]

The present invention has the following arrangement to achieve the above object. The ballpoint pen according to the first aspect of the present invention is provided with a tip of the ballpoint pen at the tip and an ink storage tube at the rear, a spring is inserted in the tip, and the tip of the spring presses the back of the tipball, so that the tipball is pressed. In a ball-point pen provided so as to be in close contact with the inner edge of the ball holding portion at the tip of the tip, the ink containing tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent, and sedimentation of the pigment occurs. Is filled with white pigment ink that is blended so that fluidity is prevented and fluidity is not impaired as much as possible. A follower is provided at the rear end of the ink to prevent evaporation of the ink and follow the ink as the ink is consumed. Further, a valve body having an expandable and contractible valve chamber at the rear thereof and sealing the front and rear ends thereof is provided, and the valve chamber is pressurized and depressurized by expanding and contracting the valve chamber, so that the front and rear valves are provided. A pumping type pressurizing mechanism is provided in which the structure is opened alternately and air is pushed into the rear end of the follower and pressurized, so that fluidity of the ink to the chip side is supported. It is characterized by the following.

According to a second aspect of the present invention, there is provided a ballpoint pen having a tip of a ballpoint pen at the tip and an ink storage tube at the rear, a spring inserted in the tip, and the tip of the spring presses the back of the tip ball. In a ballpoint pen in which the tip ball is provided so as to be in close contact with the inner edge of the ball holding portion at the tip of the tip, a crosslinking substance is added to the ink storage tube in the ink solvent, and the tip ball rotates as the handwriting is performed. It is filled with ink that can be erased with an eraser because it gels in the drawing state and does not penetrate the paper, and a follower that prevents evaporation of the ink at the rear end of the ink and follows the ink with consumption of the ink is arranged, Further, a valve body having an expandable and contractible valve chamber at the rear thereof and sealing the front and rear ends thereof is provided, and the valve chamber is pressurized and depressurized by expanding and contracting the valve chamber, thereby providing a front and rear valve mechanism. A pumping type pressurizing mechanism that opens alternately and pushes in air at the rear end of the follower and pressurizes the air is provided to support the flow of ink to the tip side. Features.

[0006]

FIG. 1 shows an embodiment of a ballpoint pen according to the present invention. First, a white pigment ink 9 is filled in the ink storage tube 2 of the ball-point pen 1, and a grease-like follower 10 that follows the ink as the ink is consumed at the rear end of the ink.
Is filled. In addition, the follower is not compatible with the ink and has a function of preventing the evaporation of the ink. In addition, a resin follower rod 11 having a specific gravity substantially equal to that of the follower is immersed in the follower as required. The follower may be a follower such as silicon rubber. The white pigment ink 9 contains at least a titanium oxide, a white pigment such as polymer hollow fine particles, and a gelling agent,
It is a white pigment ink formulated to prevent sedimentation of the pigment and to minimize the loss of fluidity. In addition, since the ink has a shear thinning property, the viscosity can be reduced by the rotation of the tip ball, so that a coating having a high concealing property can be performed. On the other hand, the white pigment ink 9 is formed into a sol by adding a cross-linking substance to the ink solvent and rotating the tip ball with writing.
It is an ink that can be erased with an eraser because it gels in the drawing state and does not soak into paper.

As shown in the figure, the joint 4 has a front shaft portion 4a formed in front of a flange portion 4b and a rear shaft portion 4c formed rearward, and a tip ball 6 is inserted into a chip fitting hole 4d at the front end of the front shaft portion 4a. The shaft portion 3b of the chip 3 holding the chip 3 is fixed. Further, a rib 4e is formed at a required location on the outer periphery of the front shaft portion 4a. or,
The tip 3 is caulked so that the tip ball 6 is rotatably held with the tip ball 6 substantially in contact with a seat having a channel into which ink can flow. Further, the spring 7 is inserted into the inner hole of the chip 3, the rear end of the shaft 3b of the chip is appropriately caulked, and the rear end of the spring 7 cannot be pulled out.

Further, a linear rod portion 7 a is formed in front of the spring 7, and the tip of the rod portion 7 a abuts against the back surface of the tip ball 6 in a pressing manner. Note that the tip ball 6 is pressed by the ball holding portion 3a of the chip 3 (formed by caulking or the like).
Is in close contact with the inner edge of the body. Further, it is extremely important that the tip ball 6 be in close contact with the inner surface of the ball holding portion 3a for drying the writing tip and preventing direct current of the ink even if the ink has a high viscosity. That is, in order to increase the amount of ink discharged, the ballpoint pen for correcting and writing the erroneous writing as in the present application is set to have a larger retreat size of the tip ball than the ballpoint pen for writing. In addition, grinding of the inner surface to improve the surface roughness of the inner surface of the chip holding the tip ball 6 and close contact accuracy by caulking, and secondary plastic working to increase the caulking accuracy are considered. Also, if necessary, a surface treatment or the like may be considered on the surface in close contact with the tip ball.

A valve chamber 5 which is appropriately eccentric with respect to the axis of the chip 3 is provided behind the chip fitting hole 4d, and a tapered or spherical shape is provided at the rear of the valve chamber 5 so as to communicate with the guide hole 5b. Is formed. On one side of the inner wall of the valve chamber 5, a groove 5c into which ink can flow is formed.
Further, a spherical valve element 8 is loosely fitted in the valve chamber 5, and the chip 3
When the valve body 8 is abutted against the rear end of the tip portion 3b of the tip with the face down, the ink flowing from the guide hole 5b through the groove 5c or the like flows into the tip inner hole. It is configured. Note that the valve body may be a shaft-like body having a tapered or spherical shape on the side close to the valve body receiving seat. In this case, the valve chamber does not need to be eccentric with respect to the chip axis as described above by forming a groove through which ink flows into the chip on the peripheral surface of the chip in contact with the rear end of the shaft portion of the chip. .

A rear shaft portion 4c extends behind the flange portion 4b of the joint 4. On the outer periphery of the rear shaft portion 4c, a cylindrical ink storage tube 2 is press-fitted and fixed with its front end abutting on the rear end of the flange portion 4b.
b. The ink storage tube 2 is made of, for example, a transparent PP resin molded product. Further, in the ball-point pen of the above-described embodiment, the joint and the ink storage tube are formed as separate members, but both may be formed as an integral resin molded product.

As shown in FIGS. 1 and 2, a pumping type pressurizing mechanism is provided at the rear end of the ink storage tube 2. First, the pressurizing mechanism portion includes a bush 12, a joining cylinder 13, a receiving member 18, two springs and two valve bodies, a return spring 21, and the like. The bush 12 is opposed to the rear end of the follower 10. It is fixed in the ink storage tube 2.

As shown in FIG.
And a rear tubular portion 16 between which an elastically stretchable bendable portion 15 such as a bellows is provided.
And are provided integrally or connected. A valve chamber 14b is provided at the front axis of the front cylinder portion 14, a tapered or spherical valve element receiving seat 14a is formed at the rear end of the valve chamber, and a through hole 14c is further provided at the rear. The front cylinder 14 is pressed into the ink storage tube with its front end in contact with the rear end of the bush 12 and the flange 14d provided on the rear end of the front cylinder 14 in contact with the rear end of the ink storage tube 2. Is done. At this time, a ball-shaped first valve body 17 is loosely fitted into the valve chamber 14b, and a first spring 2 is further provided between the valve body and the rear end of the bush 12.
0a is provided to urge the valve body so as to be in close contact with the valve body receiving seat 14a.

The receiving member 18 has a tapered or spherical valve body receiving seat 18a formed at the rear end on the inner circumference and a through hole 18b provided further rearward, and is pressed against the outer circumference of the rear cylinder portion 16. . At this time, the ball-shaped second valve body 19 is loosely fitted in a state in which it comes into contact with the valve body receiving seat 18a, and the valve body and the stepped portion formed at the rear end of the through hole 14c of the front cylindrical portion. Second in between
The spring 20b is provided so that the valve element is
a, and a return spring 21 is provided between a rear end of the flange portion 14d of the front cylindrical portion and a flange portion 18c formed at a front end of the receiving member 18,
The receiving member 18 is urged rearward with respect to the front cylinder portion 14. The valve chamber 15a sealed between the two valve bodies is extendable and contractible.

Next, FIGS. 2 to 4 show an embodiment as a writing implement in which the ballpoint pen of the present invention is mounted on a shaft main body. The shaft body includes a cap 22, a shaft cylinder 24, and a tail plug 28. First, as shown in the figure, the shaft cylinder 24 is a resin molded product, and has a mouth portion 25 integrally with the front end thereof, an engaging portion formed of a protrusion and a groove portion on the outer periphery thereof, and an inner hole of the mouth portion 25. A step 26 is formed on the peripheral surface. Further, a step portion is formed at the rear end of the engaging portion with which an end portion of a cap 22 described later abuts. The ballpoint pen 1 is inserted from behind the barrel 24,
The rib 4 e provided on the outer periphery of the joint 4 engages with the step 26, and the forward end of the tip 3 protrudes from the tip hole of the mouth 25.

A tail plug 28 is detachably fastened to the rear of the barrel 24 (screwed as an example), and a flange portion 18c of the receiving member 18 is fitted to a step 28b provided in the inner hole of the tail plug 28. Be abutted. Similarly, on the outer periphery of the tail plug 28, an engaging portion composed of a protrusion and a groove, and a step portion where the end of the cap 22 abuts on the front end of the engaging portion are formed.

The cap 22 fitted to the front end of the shaft cylinder 24 is a resin molded product having excellent elasticity. A clip is positioned on the outer peripheral side of the cap 22 and the rear end of the cap is pressed into the rear end hole of the cap. ing. Further, a ventilation hole penetrates a rear end of the cylindrical portion of the clip. Further, a cylindrical inner cap 23 having a small chamber is provided behind the inner hole of the cap 22, and the inner cap 23 is integrally formed with a required number of ribs between the inner cap 23 and the cap inner hole. . As described above, an air passage communicating from the cap insertion port to the air hole is formed between the ribs, and is a safe ventilation means in the event that an infant swallows the cap. A sealing plug 27 made of a non-liquid-absorbing, non-continuous-cell elastic body is fixed to the tip of the small chamber of the inner cap 23. When the cap is fitted, the tip 3 and the tip 25 are in front of each other. The tip is in close contact with the seal plug 27 while being substantially closely fitted in the small chamber.

[0017]

Next, the operation of the embodiment will be described below. First,
When writing pressure is applied to the tip of the tip 3, the bendable portion 15 contracts and the inside of the valve chamber 15a is pressurized due to the retraction of the ballpoint pen 1 accompanying the writing pressure, and the first valve body 17 is opened to open the follower 1
When air is pushed into the rear end of the follower 1, the rear end of the follower is pressurized to support the flowability of the ink to the tip side. This serves to prevent the ink from separating from the peripheral surface of the tip ball due to a drop impact, poor ink fluidity, and the like, thereby preventing continuous outflow of the ink.

When the writing pressure is released, the bendable portion 15 is restored by the return spring 21, the pressure in the valve chamber 15a is reduced, and the second valve body 19 is opened, so that air flows into the valve chamber 15a from the through hole 18b. Inflow. That is, the second spring 20b is set with a weak spring force. The strength of the first spring 20a is set within a range in which a necessary pressurization can be obtained. Further, the return spring is set within a range where the receiving member 18 can be surely restored to the front cylinder portion 14 and in consideration of an appropriate writing pressure.

Next, the operation of the ballpoint pen writing section will be described. FIG. 1 shows a state in which the tip 3 is directed upward. At this time, the valve element 8 is located at the valve element receiving seat 5a of the valve chamber 5 and seals the guide hole 5b. Even if the ink on the back side runs out, the ink is caught by the head and does not flow backward. Therefore, when the tip 3 is turned downward, the ink can immediately flow out. Further, in the writing state in which the tip 3 is directed downward, the valve body 8 abuts on one of the rear ends of the tip in a biased state, and the other end of the tip 3
A groove 5c through which ink can flow is formed, and the ink 9 that has entered the valve chamber 5 from the ink storage tube 2 through the guide hole 5b is guided to the back of the tip ball 6 of the chip 3 through the groove 5c.

By the way, in the structure having no ball valve, when the upward writing is repeated, the ink acts in the backward flow direction, so that air is entrapped in the chip, and it is difficult for the ink to immediately flow out in the downward writing. However, there is a problem that the flow path of the ink that is difficult to flow is obstructed and the ink is cut off. Therefore, it may be better not to provide the valve body 8 for design reasons.

In this ball-point pen, the tip ball 6 is brought into close contact with the inner edge of the chip holding portion 3a by the pressing of the rod shaft 27a of the spring 7, so that direct current of ink is prevented. In addition, since the tip ball 6 retreats due to the writing pressure, a gap is generated and ink can flow out. With the help of the pressurizing action, the ink flows out by the rotation of the tip ball 6 by writing, and correction of typographical errors and erasing can be performed with an eraser. A ballpoint pen using ink can be provided.

[0022]

As described above, the present invention comprises at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent, and is blended so that sedimentation of the pigment is prevented and fluidity is not impaired. By using the prepared white pigment ink, there is no problem that the white pigment and the solvent are separated as in the prior art, and therefore, it is not necessary to agitate the ink.
Further, by using the above-described ball-point pen structure, the side surface of the container is not pressed during writing. In addition, it is possible to provide a ball-point pen which can be erased with an eraser because it is formed into a sol by the rotation of the tip ball accompanying writing and gelated in a drawn line state and does not permeate into paper.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entirety of a ballpoint pen according to an embodiment of the present invention, showing a state in which a chip is upward.

FIG. 2 is an enlarged sectional view of a front half of a shaft main body on which a ballpoint pen of the present invention is mounted, and shows a state in which a cap is fitted to a front end of a shaft cylinder.

FIG. 3 is an enlarged sectional view of a rear half of a shaft main body on which the ballpoint pen of the present invention is mounted.

FIG. 4 is a half cross-sectional view showing the entire shaft main body on which the ballpoint pen of the present invention is mounted, and shows a state where a cap is fitted to the rear of the shaft cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Ink storage tube 3 Tip 3a Ball holding part 3b Shaft part 4 Joint 4a Front shaft part 4b Flange part 4c Rear shaft part 4d Chip fitting hole 4e Rib 5 Valve chamber 5a Valve body seat 5b Guide hole 5c Groove part 6 Tip ball 7 Spring 7a Rod shaft part 8 Valve body 9 Ink 10 Follower 11 Follower rod 12 Bush 13 Joining cylinder 14 Front cylinder part 14a Valve body receiving seat 14b Valve chamber 14c Through hole 14d Flange part 15 Bendable part 16 Rear cylinder part 17 1st valve element 18 receiving member 18a valve element receiving seat 18b through hole 18c flange 19 second valve element 20a first spring 20b second spring 21 return spring 22 cap 23 inner cap 24 barrel tube 25 tip 26 Step 27 Seal plug 28 Tail plug 28a Through hole 28b Step

Claims (2)

[Claims] A tip is provided with a tip of a ball-point pen and an ink storage tube at the rear, a spring is inserted in the tip, and the tip of the spring presses the back of the tip ball, so that the tip ball is a ball holding portion at the tip of the tip. In a ball-point pen which is provided so as to be in close contact with the inner edge of the ink container, the ink container tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent to prevent sedimentation of the pigment and to improve fluidity. Is filled with white pigment ink so that it is not damaged as much as possible, and a follower that prevents evaporation of the ink and follows the ink as the ink is consumed is arranged at the rear end of the ink. A valve body having a possible valve chamber and sealing the front and rear ends thereof is provided, and the valve chamber is pressurized and depressurized by expanding and contracting the valve chamber, and the front and rear valve mechanisms are alternately opened to open the follower. A ball-point pen having a pumping-type pressurizing mechanism that presses air into the rear end thereof to pressurize the ink, so that the fluidity of the ink toward the chip is supported. 2. A tip of a ballpoint pen and an ink storage tube at the rear are provided, and a spring is inserted into the tip. The tip of the spring presses the back of the tip ball, and the tip ball is held in a ball holding portion at the tip of the tip. In a ball-point pen that is provided so as to be in close contact with the inner edge of the ink, a cross-linking substance is added to the ink container in the ink solvent, and the tip ball rotates during writing to form a sol, gel in a drawing state, and form a paper. The ink is filled with ink that can be erased with an eraser because it does not soak, and a follower that prevents evaporation of the ink and follows the ink as the ink is consumed is arranged at the rear end of the ink. A valve body is provided to seal the front and rear ends thereof, and the valve chamber is pressurized and decompressed by expanding and contracting the valve chamber, and the front and rear valve mechanisms are alternately opened to push air to the rear end of the follower. A ball-point pen having a pumping-type pressurizing mechanism that is inserted and pressurized so as to support the flow of ink toward a chip.