JPH11240286A - Ball-point pen writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the inside of a barrel, hands and clothes from being stained by preventing the reverse flow of an ink generated by an upward writing and an impact, from occurring, and at the same time, make a writing possible by pumping an ink of a high viscosity by utilizing a pressurizing action by a writing pressure at the time of usage. SOLUTION: A connecting cylinder which is stretchable in the axial direction, is provided between a barrel and a mouth tip utensil wherein a tip is fixed at the tip end, and at the same time, a return spring 8 is urged between the barrel and the mouth tip utensil, and the mouth tip utensil is provided in a manner to be longitudinally moved within a proper range based on the barrel. Also, a spring 7 is inserted in a tip internal hole, and by the forward tip of the spring 7, the rear end of a tip end ball 12 which is rotated embraced by the tip end of the tip is pressed, and the tip end ball 12 is joined to the internal edge of the ball embracing part of the tip, and the tip end ball 12 is provided in a manner to prevent an ink from flowing out. Therefore, the spring 7 is urged in such a manner that a valve body 6 may be joined to a valve body receiving seat 25 at the tip end of the barrel, and a closed space where the ink is filled, is constituted between the tip end ball 12 of the tip and the valve body 6, and the ink is pushed out from the tip end of the tip by a retraction of the mouth tip utensil accompanying a writing pressure, based on the barrel, and when the writing pressure is released, the valve body 6 opens by a negative pressure which occurs in the closed space, and the ink is replenished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a ballpoint pen or a ballpoint pen-type correction applicator for causing a high-viscosity ink to flow out by using a pressure applied by a pen pressure.

[0002]

2. Description of the Related Art There is known a ballpoint pen using an ink having a shear-thinning viscosity, which exhibits a high viscosity in a static state, and the viscosity is reduced by the rotation of a tip ball during writing, so that the ink flows out. When the viscosity of the ink is increased, there is a problem that the ink outflow state may become uneven or impossible to follow if the pressure is reduced by the weight of the ink or the rotation of the tip ball. In general, a ballpoint pen is liable to cause ink leakage (ink flows backward at the rear end of the ink storage tube) due to the weight and impact of the ink. For this purpose, a grease-like follower is usually provided at the rear end of the ink to suppress the backflow of the ink following the consumption of the ink during writing. However, even if a follower is provided, when writing upwards, if the ink on the back of the ball of the chip runs out, a backflow occurs because the ink head is added directly,
There is a danger that the inside of the barrel will be soiled and ink will leak from the air holes provided in the barrel to stain the hands and clothes.

Further, conventionally known correction applicators use a liquid such as ink having a hiding power containing a pigment or the like as a coating liquid, and there is a problem that the pigment sediments and separates from the solution.
A means for stirring the ink by inserting a ball or the like into the ink storage tube is provided. Therefore, it is necessary to stir the ink by shaking the applicator during use. In addition, since the ink storage tube is made flexible and the side wall thereof is pressed by hand to discharge the ink, there is a problem that the ink is excessively discharged, causing unevenness and slow drying. Further, when the remaining amount of the ink in the ink container becomes small, there is a frustration that the ink is not discharged even if the side wall of the ink container is pushed strongly.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the ink from flowing backward due to upward writing or impact of a ballpoint pen, thereby preventing the inside of a barrel, hands, and clothes from being stained. Even with the progress of ink-jet printing, ink is pumped by utilizing the pressurizing action of the writing pressure, and the ink is appropriately discharged to enable writing with a high density. Further, when a ballpoint pen-type correction applicator is used, the above-mentioned conventional problems can be solved.

[0005]

The present invention has the following arrangement to achieve the above object. The ballpoint pen writing body according to the first aspect of the present invention is provided with a joint cylinder that is axially expandable and contractible between a shaft cylinder and a mouthpiece having a tip fixed to a tip, and between the shaft cylinder and the mouthpiece. A return spring is urged so that the mouthpiece moves back and forth in an appropriate range with respect to the shaft cylinder, and a spring is inserted into the tip bore so that the tip of the spring can rotate freely to the tip end. The rear end of the held tip ball is pressed so that the tip ball comes into close contact with the inner edge of the ball holding portion of the chip to prevent ink from flowing out. A spring is urged so that the valve body comes in close contact with the tip, and a closed space filled with ink is formed between the tip ball of the tip and the valve body. When the ink is pushed out of and the pen pressure is released Negative pressure in the valve body is opened ink becomes is configured to be replenished occurring closed space.

[0006] The ballpoint pen writing body according to the second aspect of the present invention is the ballpoint pen writing body according to the first aspect,
A second valve body is provided at the rear end of the spring in the chip inner hole, and the valve body is provided so as to be in close contact with the inner surface of the chip rear end.

According to a third aspect of the present invention, there is provided a ballpoint pen writing body according to the first and second aspects, wherein the ink container has a statically high viscosity, and A grease-like follower that is filled with ink having a so-called shear thinning property, whose viscosity is reduced by the rotation of the tip ball, and that follows the ink as it depletes, is substantially equivalent to the follower in the follower. And a resin follower rod having a specific gravity of

According to a fourth aspect of the present invention, there is provided a ball-point pen writing body according to the first and second aspects, wherein the ink containing tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles. It contains a gelling agent, is filled with white pigment ink formulated to prevent sedimentation of the pigment and not impair the flowability, and a grease-like ink that moves at the rear end of the ink following the consumption of the ink. A follower and a resin-made follower rod having substantially the same specific gravity as the follower are immersed in the follower.

[0009]

1 and 2 show a first embodiment of the present invention. As shown in FIG. 1, the ballpoint pen writing body 1 has a joint cylinder 3 that is axially expandable and contractible between a barrel 2 and a mouthpiece 5, and a return spring 8 is provided between the barrel 2 and the mouthpiece 5. The nosepiece 5 is provided so as to be urged and moved back and forth in an appropriate range with respect to the barrel 2. First, the shaft cylinder 2 has a front shaft portion 2a formed at a step portion 2c and a front end portion in front of the flange portion 2b, and a shaft portion 2d formed behind the flange portion 2b. Further, a tapered or spherical valve element receiving seat 2f is provided at the axis of the front shaft portion 2a.
And a conductive hole 2g are formed, and the conductive hole 2g communicates with the rear end.

The mouthpiece 5 has a tapered tip 5a at the tip, a shaft 5b at the rear, and a shaft 5c at the rear.
It has a hole penetrating from the front end to the rear end.
d is formed. The shaft 10a of the chip 10 holding the tip ball 12 is press-fitted into the tip hole. Further, the shaft portion 10a is provided with a locking portion of a ridge so that the tip 10 is securely fixed to the lip tool 5. (In addition, the locking part is provided for the necessity of the fixing strength)

The joining cylinder 3 has a front cylinder 3a having a step 3e at the front end and a rear cylinder 3c at the rear end, and is provided between the rear end of the front cylinder 3a and the front end of the rear cylinder 3c. It is a cylindrical body that is opened only in the axial direction and that is integrally formed with a bendable portion 3b that can expand and contract in the axial direction, such as a bellows.

As described above, the rear cylinder portion 3c of the joint cylinder is fixedly attached to the front shaft portion 2a of the shaft cylinder, and the front cylinder portion 3a of the joint cylinder is tightly fitted to the shaft portion 5b of the lip. At this time, a ball-shaped valve element 6 is inserted into the front end of the valve element receiving seat 2f of the shaft cylinder, and a weak spring 7 is attached between the step 5d at the rear end of the lip 5 and the valve element 6. Be inspired. Further, a return spring 8 is provided between the step 2c of the shaft cylinder and the step 3e at the rear end of the front cylinder 3a of the joining cylinder.
Is provided so that the tip tool 5 can be moved back and forth within a proper range with respect to the barrel 2.

The tip 10 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. Further, a spring 11 is inserted into the inner hole of the chip 10, and the rear end of the shaft portion 10a of the chip is appropriately caulked (caulked portion 10b) so that the rear end of the spring 11 cannot be pulled out. A linear rod portion 11 a is formed in front of the spring 11, and the tip of the rod portion 11 a abuts on the rear end of the tip ball 12 in a pressing manner. 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 10 by the pressing.

An ink storage tube 13 is fixed to the shaft portion 2d at the rear end of the shaft cylinder 2, and the ink storage tube is filled with ink 14, and the rear end of the ink 14 follows the ink as it is consumed. A movable grease-like follower 15 is filled, and a resin follower rod 16 having a specific gravity substantially equal to that of the follower 15 is immersed in the follower 15.

FIG. 2 shows a state in which the ball-point pen writing body 1 is attached to a shaft with a replacement core. The rear part of the ball-point pen writing body 1 is inserted into an inner hole of the rear shaft 18 so as to be positioned behind the flange 2b. The end abuts on the front end of the rear shaft 18, and the step 17b abuts on the front end of the flange 2b in a state where the front shaft 17 projects the mouthpiece 5 from the front end opening 17a, and the front shaft 17 is 1
8 is screwed to form a writing instrument.

FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, as shown in FIG.
In this case, a second valve body 22 (ball-shaped) is provided at the rear end of the spring 21, and the valve body 22 is caulked at the rear end of the chip 20 (caulking portion 20b) so that it cannot be pulled out and its inner surface 20c, and the other configuration is the same as that of the first embodiment.

When the writing tool for correcting a typographical error is used as the ballpoint pen writing body, the ink storage tube 13 is filled with white gel ink. The white gel ink is a white pigment ink containing at least a white pigment such as titanium oxide and hollow polymer fine particles and a gelling agent, which is blended so that sedimentation of the pigment is prevented and fluidity is not impaired. is there. When the viscosity of the ink is 10,000 cps or less (E-type viscometer, 1 rpm, 25 ° C.), the pigment tends to settle. On the other hand, if it is 50,000 cps or more, there is a problem in ink discharge. 1000 if preventing sedimentation of pigment
00 cps or more is desirable. In the present application, a means for forcibly ejecting ink by encouraging the writing pressure is used, so that it is possible to eject even such a high viscosity, and since the ink has a shear thinning viscosity, the tip ball In addition to the decrease in viscosity due to the rotation of, coating with a high concealing property becomes possible.

[0018]

First, in FIGS. 1 and 2, the ink fills the space 9 in front of the valve body 6 and fills the back of the tip ball 12 of the chip 10. When writing pressure is applied to the distal end ball 12 in this state, the mouthpiece 5 retreats with respect to the barrel 2 against the return spring 8, and retreats by a maximum of dimension 4. At that time,
The space 9 is reduced, the internal pressure is increased, ink is forcibly supplied into the chip 20, and the ink flows out with the rotation of the tip ball 12 accompanying writing. When the pen pressure is released, the mouthpiece 5 returns to the shaft cylinder 2, so that the space 9 is enlarged and the pressure is reduced. At this time, the valve 6 is opened, and the ink flows into the space 9 from the guide hole 2g. Hereinafter, by repeatedly writing and releasing the tip ball 12, the ink is sequentially pumped and the ink is reliably supplied into the chip even if the ink has a high viscosity.

By the way, the urging force of the spring 7 for bringing the valve body 6 into close contact with the valve body receiving seat 2f and the pressing force of the spring 11 for bringing the tip ball 12 into close contact with the ball holding portion of the chip are weak. The spring 7 is set to be weaker than the spring 11 because of the action configuration in which the valve 6 opens when the space 9 is depressurized. Since the second embodiment has the second valve body 22, there is no need to make a difference in strength between the spring 21 and the spring 7, and any setting suitable for performance can be made.

Further, even in the upward writing, the ink is supplied by the above-mentioned pumping action, and the writing can be performed. In addition, since the valve body is always closed, the tip 10 is turned upward to prevent the backflow of the ink due to its own weight or the impact of dropping.
On the other hand, when not writing, the rod shaft 1 of the spring 11
Since the tip ball 12 is brought into close contact with the inner edge of the chip holding portion by the pressing of 1a, direct current of ink is prevented. In addition, drying of the back surface of the tip ball 12 is prevented. Further, since the tip ball 12 slightly retreats due to the writing pressure, a gap is generated and ink can flow out.

[0021]

The construction and operation of the ballpoint pen writing body of the present invention are as described above, and the backflow of ink due to upward writing or impact can be prevented by the normally closed valve body.
Accidents that stain the inside of the barrel, hands, clothes, etc. are prevented. In addition, since the ink is pumped by the writing pressure and the release thereof, the high-viscosity ink can reliably flow out, and it is possible to expect a thick writing line without unevenness in writing. Also, writing in an upward direction is possible. Further, in a state where writing is not performed, the tip ball is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion, so that direct current of ink is prevented. In addition, since the back surface of the tip ball is prevented from being dried, handwriting is prevented. In addition, since high-viscosity ink can flow out, it is possible to use ink which does not have a problem of sedimentation of the pigment like ink of a conventional correction applicator. Therefore, it is possible to provide a correction applicator that does not have the problem of stirring the ink and the problem of excessively discharging the ink by pressing the side wall of the ink storage tube.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a ballpoint pen writing body according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which the ballpoint pen writing body according to the first embodiment of the present invention is mounted on a shaft.

FIG. 3 is a longitudinal sectional view of a main part of a ballpoint pen writing body which is Embodiment 2 of the present invention.

FIG. 4 is an enlarged cross-sectional view of a tip of a ballpoint pen writing material according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball-point pen writing body 2 Shaft cylinder 2a Front shaft part 2b Flange part 2c Step part 2d Shaft part 2e Groove 2f Valve body seat 2g Guide hole 3 Joining cylinder 3a Front cylinder part 3b Bendable part 3c Rear cylinder part 3d Step part 3e Step Part 4 Dimension 5 Mouth 5a Tip 5b Shaft 5c Shaft 5d Step 6 Valve Body 7 Spring 8 Return Spring 9 Space 10 Chip 10a Shaft 10b Caulking 11 Spring 11a Rod Shaft 12 Tip Ball 13 Ink Storage Tube 14 Ink 15 Follower 16 Follower rod 17 Front shaft 17a Tip opening 17b Step 18 Rear shaft 18a Tip 18b Groove 19 Tail 20 Tip 20a Ball holding portion 20b Caulking portion 20c Inner surface portion 21 Spring 21a Rod shaft portion 22 Second valve body

Claims (4)

[Claims] An axially expandable joint cylinder is provided between a shaft cylinder and a mouthpiece having a tip fixed to a tip, and a return spring is urged between the shaft cylinder and the mouthpiece to provide a shaft. The tip of the tip ball is provided so as to move back and forth in an appropriate range with respect to the cylinder, and a rear end of a tip ball rotatably held at the tip end of the tip by inserting a spring into the tip bore. Is pressed so that the tip ball is brought into close contact with the inner edge of the ball holding portion of the chip to prevent the outflow of ink, and a spring is provided so that the valve body comes into close contact with the valve body receiving seat at the tip of the barrel. Energized, a closed space filled with ink is formed between the tip ball of the tip and the valve body.Ink is pushed out from the tip of the tip by the retraction of the tip with the pen pressure against the barrel, and the pen pressure is reduced. The valve body opens due to the negative pressure generated in the closed space when released A writing pen for a ball-point pen, characterized in that ink is replenished. 2. The ballpoint pen writing body according to claim 1, wherein a second valve body is provided at a rear end of the spring in the chip inner hole, and the valve body is provided so as to be in close contact with an inner surface of the chip rear end. 3. An ink storage tube is filled with an ink having a so-called shear-thinning viscosity, which has a high viscosity statically and whose viscosity is reduced by rotation of a tip ball during writing, and a rear end of the ink. 3. A grease-like follower which moves following the consumption of ink and a resin follower rod having a specific gravity substantially equal to that of the follower is immersed in the follower.
The ballpoint pen cursive according to. 4. The ink container contains at least a white pigment such as titanium oxide and hollow polymer particles and a gelling agent,
A grease-like follower and a follower, which are filled with a white pigment ink formulated so that sedimentation of the pigment is prevented and the fluidity is not impaired, and which moves with the consumption of the ink at the rear end of the ink, are filled. 3. The ballpoint pen writing body according to claim 1, wherein a resin follower rod having a specific gravity substantially equal to that of the follower is immersed.