JPH1076788A - Ball-point pen writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reverse flow of ink generated by upward writing and impact by a method wherein a valve chamber which is tightly closed by a valve disk normally brought into contact with a receiving seat by a spring is provided in a mouthpiece behind a tip. SOLUTION: When writing pressure is applied to a tip ball 21, a mouthpiece 10 retreats to a shaft cylinder 2 against a return spring 27. At that time pressure in a second valve chamber 4 rises, a first valve disk 23 is opened, ink flows into a first valve chamber 15 and is forced to be supplied into the tip 20, which flows out together with rotation of a tip ball 21 following writing. Then, when the writing pressure is released, the moutnpiece 10 returns to the original state to the shaft cylinder 2, and pressure in a second valve chamber 4 is reduced. At that time, a second valve body 25 openes, and ink flows into the valve chamber 4 from a conducting pore 8. Hereafter by repeating writing pressure of the tip ball 21 and its release, the ink is successively pumped. Further, since the valve disks 23, 25 are generally closed, the ink is prevented from flowing reversely owing to own weight of the ink and its drop impact.

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 rotation of a ball at the time of 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 that,
Usually, a grease-like follower is 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 the follower is provided, when writing upwards, if the ink on the back side of the ball of the chip runs out, the ink head is directly added, and a backflow occurs, thereby contaminating the inside of the shaft cylinder and causing ink to flow through the vent hole provided in the shaft cylinder. Risk of leaking and soiling hands and clothing.

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, and the high viscosity of the ink. 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]

In order to achieve the above-mentioned object, a ballpoint pen writing body of the present invention moves a mouthpiece having a tip secured to the tip of a shaft cylinder forward and backward within an appropriate range by writing pressure and release thereof. A spring is inserted into the tip inner hole so that the spring cannot be pulled out from the rear end of the tip, and the rear end of the tip ball rotatably held at the tip end of the tip at the tip of the spring. The tip ball is provided so as to be pressed against the inner edge of the ball holding portion of the chip so as to prevent the ink from flowing out. Also, the first spring is always provided in the mouthpiece behind the chip by the first spring. A first valve chamber is provided in which the valve body is in close contact with the receiving seat, and the second valve body is always provided by a second spring in the distal end bore of the barrel at the rear of the first valve body. Is provided with a second valve chamber which is tightly fitted in contact with the receiving seat. Ink holding tube further ink having a high viscosity to the rear of the second valve body is filled is provided.

[0006]

1 and 2 show an embodiment of the present invention. First, as shown in FIG. 1, a ballpoint pen writing body 1 is formed by connecting a base 10 having a tip 20 fastened to a front shaft portion 2a at a front end of a barrel 2 so as to be axially movable. The base 10 has a tip fitting hole 14 at the tip, into which the shaft portion 20a of the tip 20 holding the tip ball 21 is press-fitted. The shaft portion 20a is provided with a projection locking portion 20b,
Are securely fixed to the base 10. (In addition, the locking part is provided for the necessity of the fixing strength)

The tip 20 is caulked so that the tip ball 21 is rotatably held with the tip ball 21 substantially in contact with a seat having a channel into which ink can flow. Further, a spring 22 is inserted into the inner hole of the chip 20, and the rear end of the shaft portion 20a of the chip is appropriately caulked (caulked portion 20c) so that the rear end of the spring 22 cannot be pulled out. A linear rod portion 22a is formed in front of the spring 22, and the distal end of the rod portion 22a is
1 is pressed against the rear end. The tip ball 21 is pressed by the ball to hold the tip 20 (formed by caulking or the like).
In close contact with the inner edge of

A first valve body 23 is provided behind a chip 20 in the bore of the base 10 together with a bush 18 having a receiving seat 19 for closely contacting its tapered surface. At the same time, the step 16 of the base 10 is fixed.
A first spring 24 is provided between the first spring 24 and the front surface of the first valve body 23.
Is urged, the first valve body 23 is movable forward, and a first valve chamber 15 is formed between the first valve body 23 and the rear end of the chip 20.

An inner hole 1 is formed on the side surface near the rear end of the base 10.
1, a window portion 12 is provided. In addition, seal rings 6 and 7 are circumferentially disposed at required positions on the outer peripheral portion of the front shaft portion 2a in front of the flange portion 2b of the shaft cylinder 2, and a rear portion thereof has a projection corresponding to the window portion 12. An engagement portion 3 having a shape of a circle is formed. When the rear end of the return spring 27 abuts on the stepped portion 2c in front of the flange portion 2b, the front barrel portion 2a is
The front end of the return spring 27 is in contact with the rear end of the base 10 and the locking portion 3 is
2, the rear end of the locking portion 3 is locked by the step portion 13 at the rear end of the window, and the base 10 is prevented from coming off with respect to the shaft cylinder 2 so as to be able to move back and forth. Also, at that time, the base 10
Can be retracted by the gap L during which the step portion 17 contacts the tip of the barrel 2, and the front shaft portion 2a comes into close contact with the inner hole 11 with the seal rings 6, 7 slidable. The shaft cylinder 2 and the base 10 are configured as a synthetic resin molded product based on mutual connection conditions. However, since there are various connection methods, the materials are not limited.

When the shaft cylinder 2 is connected to the base 10, a tapered receiving seat 5 provided in a forward hole of the shaft cylinder 2.
And the second spring 26 is urged between the rear end of the bush 18 and the front end of the second valve body 25, so that the first valve body 25 is closed. 23
The second valve chamber 4 is formed between the second valve body 25 and the second valve body 25. Although the first and second valve bodies are provided in a tapered shape in the above embodiment, the valve body may be provided in a ball shape so as to be in close contact with the receiving seat.

The shaft cylinder 2 is provided with an ink inlet 9 having a guide hole 8 at the rear of the second valve body 25.
The inside is filled with high-viscosity ink, and the ink is filled up to the second valve chamber 4, the first valve chamber 15, and the back surface of the tip ball 21 of the chip 20. An ink storage tube 28 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 29, and the rear end of the ink 29 can move following the consumption of ink. A grease-like follower 30 is filled, and a resin-made follower rod 31 having substantially the same specific gravity as the follower is immersed in the follower 30.

FIG. 2 shows a state in which the ballpoint pen writing body 1 is attached to the shaft with a replacement core. The rear part of the shaft cylinder 2 is inserted into the inner hole of the rear shaft 36, and the rear end of the flange 2b is rearward. Shaft 36
The stepped portion 33 comes into contact with the front end of the flange portion 2b in a state where the front shaft 32 projects the base 10 from the front end port 35, and the front shaft 32 is screwed to the rear shaft 36. A writing instrument is configured.

[0013]

First, in FIGS. 1 and 2, the ink is applied to the second valve chamber 4, the first valve chamber 15, and the tip ball 21 of the chip 20.
The back is filled up. In this state, the tip ball 21
When the writing pressure is applied, the base 10 retreats with respect to the barrel 2 against the return spring 27, and retreats at most by the L dimension. At that time, the internal pressure in the second valve chamber 4 rises, the first valve body 23 opens, and ink flows into the first valve chamber 15 and the chip 2
The ink is forcibly supplied to the inside of the nozzle and the ink flows out with the rotation of the tip ball 21 accompanying the writing. When the writing pressure is released, the base 10 returns to its original state with respect to the barrel 2, so that the pressure in the second valve chamber 4 is reduced. At this time, the second valve body 25 is opened, and ink flows into the valve chamber 4 from the guide hole 8. Hereinafter, by repeatedly writing and releasing the tip ball 21, the ink is sequentially pumped and the ink is reliably supplied into the chip even if the ink has high viscosity. Further, even in the upward writing, the ink is supplied by the pumping action, and the writing can be performed. In addition, since the valve body is always closed, the tip 20 is turned upward to prevent the ink from flowing backward due to its own weight or drop impact.

On the other hand, when no writing is performed, the spring 2
Since the tip ball 21 is brought into close contact with the inner edge of the chip holding portion by the pressing of the second rod shaft portion 22a, direct current of ink is prevented.
In addition, drying of the back surface of the tip ball 21 is prevented. Further, since the tip ball 21 slightly retreats due to the writing pressure, a gap is formed and ink can flow out.

[0015]

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, an ink free from the problem of sedimentation of the pigment like the ink of the conventional correction applicator can be obtained. 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 material according to an embodiment of the present invention.

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

[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 3 Locking part 4 Second valve chamber 5 Receiving seat 6 Seal ring 7 Seal ring 8 Guide hole 9 Ink inlet 10 Cap DESCRIPTION OF SYMBOLS 11 Inner hole 12 Window part 13 Step part 14 Chip fitting hole 15 First valve chamber 16 Step part 17 Step part 18 Bush 19 Receiving seat 20 Chip 20a Shaft part 20b Locking part 20c Caulking part 21 Tip ball 22 Spring 22a Rod Shaft 23 First valve body 24 First spring 25 Second valve body 26 Second spring 27 Return spring 28 Ink storage tube 29 Ink 30 Follower 31 Follower rod 32 Front shaft 33 Step 34 Locking portion 35 Point End port 36 Rear shaft 37 Front part 38 Groove 39 Locking part 40 Tail plug

Claims (2)

[Claims] 1. A tip having a tip fastened to the tip of the barrel so as to move back and forth within an appropriate range by writing pressure and releasing the tip, a spring is inserted into the tip inner hole, and the spring is inserted after the tip. The tip of the tip ball is pressed against the rear end of the tip ball rotatably held at the tip of the tip by the end of the spring so that the tip ball is in close contact with the inner edge of the ball holding portion of the tip. A first valve chamber, which is provided so as to prevent the outflow of ink, and in which the first valve body normally comes into contact with the receiving seat by the first spring by the first spring in the base behind the chip, is provided. A second valve chamber is provided, in which the second valve body is always in contact with the receiving seat by means of the second spring and closely fitted to the inner bore at the distal end of the shaft cylinder behind the first valve body. And an ink container filled with high-viscosity ink further behind the second valve body. Ballpoint pen cursive, characterized by being provided with 2. An ink storage tube is filled with an ink having a so-called shear thinning property, which has a statically high viscosity and whose viscosity is reduced by rotation of a tip ball during writing, and a trailing end of the ink. The ballpoint pen writing body according to claim 1, wherein a grease-like follower that moves following the consumption of ink and a resin follower rod having a specific gravity substantially equal to the follower are immersed in the follower.