JP2003312184A - Knock type writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive knock type writing utensil loaded with a ball-point pen using ink easy to interrupt and mainly correcting erroneous writing. <P>SOLUTION: The knock type writing utensil is provided with a ball-point pen refill which has the tip of the ball-point pen provided to the leading end thereof, has an ink housing pipe provided to the rear end part thereof and is constituted so that the ink housing pipe filled with ink and a follower for following the end of the ink. The ball-point pen refill is provided to the knock type writing utensil in a detachable manner and the leading end part of the tip of the ball-point pen can be locked in a state protruded from and retracted in the leading end of a tip shaft. A pumping type pressure mechanism is operated by pressing the knock part provided to the rear end of a shaft cylinder in such a state that the tip leading end part is protruded to push air in the rear end hole of the ink housing pipe closely fitted to the leading end of the pressure mechanism part and, at this time, a valve is opened under predetermined pressure and the rear end of the follower is pressed to support the flowing properties of ink toward the tip side. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen using an ink that easily runs out of ink in initial writing, a ballpoint pen in which various fillers are mixed in ink, and handwriting written on the paper surface can be easily erased by rubbing with an eraser. The present invention relates to a pressure-type knock-type writing instrument that can be corrected by hiding an ink-filled ballpoint pen or erroneous writing with white ink.

[0002]

2. Description of the Related Art Conventionally, a liquid applicator using a white pigment for correcting erroneous writing and the like has been known. In addition, since the white pigment and the solvent are easily separated from each other, this type of liquid applicator has a flexible container in which the ink, balls and the like are enclosed, and it is necessary to shake and stir before use. In addition, the side surface of the container is pressed to eject the ink, but when the remaining amount of the ink is low, the ink is not ejected even if the side wall of the container is strongly pressed, which is frustrating. In addition, there is a problem that the ink is easily broken during the initial writing (application). Moreover, it is troublesome to attach and detach the cap each time it is used.

In general, a ball-point pen using an ink having a low viscosity or an ink having a shear thinning property has a large ink outflow amount (to increase the writing density), and thus the diameter of the ink containing tube is increased to increase the ink loading amount. is doing. Further, since the viscosity of the ink is smaller than that of the ink of the oil-based ballpoint pen, the flow resistance to the ink containing tube is small. Therefore, ink leakage (ink flows back to the rear end of the ink containing tube) is likely to occur due to the weight of the ink, dropping, or knocking impact. Therefore, it usually moves to the trailing edge of the ink following the consumption of the ink during writing, but a grease-like follower that suppresses the backflow of the ink against its own weight and impact, and if necessary, the follower A rod is provided immersed in the follower. However, even if a follower is provided, if ink is lost on the back surface of the ball of the chip when writing upward, there is a risk of conspicuous backflow because the ink head is directly added and the hands and clothes are contaminated. Further, since the viscosity of the ink is low and the amount of outflow is large, there is a problem that the ink bleeds (DC) when a gap is formed between the tip ball and the tip holding portion when the tip side is faced down. In particular, in the case of a liquid applicator that uses a white pigment to correct typographical errors, the size at which the tip ball recedes due to writing pressure for reasons such as increasing the ink flow rate and eliminating clogging due to drying. Is large, and the gap between the peripheral surface of the tip ball and the inner surface of the ball holding portion of the chip is large.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a ballpoint pen using an ink that easily breaks the ink in initial writing, a ballpoint pen in which various fillers are mixed in the ink, and the handwriting written on the paper surface is easily rubbed with an eraser. A ballpoint pen filled with erasable ink, a ballpoint pen that can be corrected by hiding erroneous writing with white ink, and the like can be written with the aid of a pressure action. Mainly contains white pigments such as titanium oxide and polymer hollow particles, and a gelling agent,
By providing a white pigment ink formulated so that the sedimentation of the pigment is prevented and the fluidity is not impaired, and a pressure mechanism by pumping is provided, there is a problem that the white pigment and the solvent are separated as in the past. Therefore, it is possible to provide an inexpensive and easy-to-use pressure-type writing instrument that does not need to stir the ink and does not press the side surface of the container during writing.

[0005]

The present invention has the following constitution in order to achieve the above object. A knock-type writing instrument according to the invention of claim 1 is provided with a tip of a ballpoint pen and an ink containing tube at the back, and the ink containing tube is filled with ink and a follower that follows the ink at the rear end of the ink. In a knock-type writing instrument in which the refill and its ballpoint pen refill are detachably mounted and the tip of the tip can be locked in a retracted state from the tip of the tip shaft, with the tip of the tip protruding, By operating the knocking part provided at the end, the pumping type pressurizing mechanism is operated, and air is pushed into the rear end hole of the ink containing tube tightly fitted to the front end of the pressurizing mechanism part. It is characterized in that the valve is opened at a predetermined pressure and the rear end of the follower is pressurized to support the fluidity of the ink to the chip side.

A knock-type writing instrument according to a second aspect of the present invention is the knock-type writing instrument according to the first aspect, wherein the tip-ball of the tip-ball is brought into close contact with the inner edge of the ball holding portion at the tip of the tip. A spring pressure is applied to the back surface, and the ink container contains a white pigment such as titanium oxide and polymer hollow fine particles, and a gelling agent to prevent the pigment from settling and to prevent the fluidity from being impaired as much as possible. Is filled with the white pigment ink blended with.

A knock-type writing instrument according to a third aspect of the present invention is the knock-type writing instrument according to the first aspect, wherein the pumping-type pressurizing mechanism is integrally provided behind the knock cylinder inner hole. A valve mechanism part in which a tapered or spherical receiving seat and a vent hole are provided in the axial center of the inner hole of the bush, and a valve body is provided by a spring so as to be in close contact with the receiving seat, and the valve mechanism part Rearward of the knock bar, the knock bar is always biased rearward with respect to the knock cylinder, and is locked so that it can move backward, and the outer periphery of the knock bar is aligned with the peripheral surface of the knock cylinder inner hole. The knock mechanism is provided so as to be in close contact with each other and is configured to compress a space formed between the vent and the front end of the knock rod when the knock rod is advanced.

A knock-type writing instrument according to a fourth aspect of the present invention is the knock-type writing instrument according to the third aspect, wherein the rear end hole of the ink containing tube is formed in the fitting shaft portion provided in front of the bush. It is a close fit.

A knock type writing instrument according to a fifth aspect of the present invention is the knock type writing instrument according to the third aspect of the present invention, in which the valve body is brought into close contact with the knock rod in a state in which the space portion is appropriately compressed. A convex portion is provided so as to abut the rear end of the front end valve body of the knock rod so that the state is released.

[0010]

1 to 4 show a knock-type writing instrument equipped with a ball-point pen refill 5 according to an embodiment.
This knock-type writing instrument has a barrel 1 in which a front long end and a rear end are opened, and a long axial window hole 1d is formed in a part of the circumference of a side surface so as to communicate from a rear end edge to a front position by a required distance. A ball portion 1b which can be elastically displaced in the upward and lateral directions is provided at a position facing the window hole 1d of the shaft cylinder 1, and a locking step portion 1c is provided on the ball portion 1b.
And a clip 1a having a base 1e joined to the barrel 1 at the rear end is integrally molded of resin, and a U-shaped base 1e having a front end opened is surrounded by a slit at the upper end. Is an elastic piece 1f, and an inclined surface 1g is appropriately formed at the lower end of the elastic piece 1f. A front shaft 2 is detachably fixed to the front end of the barrel 1 by means such as screwing.

On the other hand, as will be described later in detail, the return spring 4 is fitted to the front shaft portion 6a of the joint 6 of the ball-point refill, and the return spring 4 is inserted from the rear end opening of the barrel 1 into the barrel 1. , The front end of the return spring 4 is the front shaft 2
Of the joint 6 and its rear end is in contact with the step 6e of the joint 6.

Further, the knock cylinder 3 is a cylinder body having a front end opening and a rear end closed, and has a locking projection 3a from the front on the coaxial line of the outer periphery.
The rib 3b and the safety piece 3c are integrally formed.
A pumping type pressurizing mechanism is provided behind the inner hole of the knock cylinder 3. The pumping type pressurizing mechanism is composed of a valve mechanism section and a knock mechanism section as described later.

First, the outer circumference of the bush 13 is made liquid-tight and fixed to the peripheral surface of the inner hole of the knock cylinder 3. In the embodiment, the rear end of the bush 13 is the stepped portion 3g of the knock cylinder 3.
Is positioned by abutting against, and is fixed by the locking portion 13f. A tapered or spherical receiving seat 13d and a vent hole 13e penetrating the axis of the bush 13 are provided at a substantially rear end of the inner hole of the bush 13, and a slit portion 13a is provided in front of the receiving seat 13d. Elastic piece that can be displaced outward by
3b is formed, a step portion 13c is provided so as to project toward the axial center side of the elastic piece 13b, and the valve body 14 is inserted by elastically displacing the step portion 13c, and further, the valve body 14 and the step portion 13c are inserted. A spring 15 is laid in between, and the valve body 14 is provided so that the valve seat 14 is always in close contact with the receiving seat 13d to form a valve mechanism portion. Furthermore, a fitting shaft portion 13g is provided at the front end of the bush 13.

On the side surface of the rear end portion of the knock cylinder 3, there is formed a tapered slit portion 3e which becomes narrower from the rear end side toward the front, and has a step portion 3f at the front end thereof and has a predetermined axial length forward. 3d is formed. Knock rod 16
Has a collar portion at its rear end and a shaft portion at its front portion, a step portion 16b provided at the front end of the collar portion, and the protrusion 1 at a substantially middle portion of the outer periphery of the shaft portion.
A circumferential groove 16c is provided at a substantially front end of the outer circumference of the shaft 6a and the shaft portion, and a seal ring 17 made of an elastic body such as rubber or an elastic molding resin is fixed to the groove 16c. The seal ring 17 is selected to have good airtightness and slidability. Also, consideration should be given to interposing another lubricant. Further, the seal ring portion can be integrally formed on the outer circumference of the shaft portion.

The knock rod 16 is inserted from the rear end of the knock cylinder 3, a knock spring 18 is laid between the front end of the knock rod 3 and the rear end of the bush 13, and the projection 16a has the tapered slit portion. 3e is elastically expanded,
The projecting portion 16a is locked to the front surface of the stepped portion 3f, and the knock spring 16 constantly urges the knock rod 16 rearward with respect to the knock cylinder 3. As described above, the knock mechanism section is arranged behind the valve mechanism section.

When the front portion of the shaft portion of the knock rod 16 is fitted into the rear end hole of the knock cylinder 3, the outer peripheral portion of the seal ring 17 slidably contacts the inner peripheral portion of the rear end hole. At that time, the seal ring 17 is
The slit portion 3d is located in a state just before it reaches the front end of the slit portion 3d, and therefore, the space portion formed between the back surface of the valve body 14 and the front end of the knock rod 16 communicates with the outside air. That is,
Immediately before the forward movement of the knock rod 16, the space is communicated with the outside air. Immediately after the knock rod 16 appropriately moves forward, the outer peripheral portion of the seal ring 17 is brought into close contact with the inner peripheral portion of the knock cylinder 3 to shut off the outside air. , Is configured to be pressurized as the space is reduced. Also, with the knock rod 16 moved forward and the space portion appropriately compressed, the receiving seat 13d of the valve body 14 is
The convex portion 16d provided at the front end of the knock rod 16 abuts on the rear end of the valve body 14 so that the close contact state with is released.

The knock cylinder 3 includes a locking projection 3a and a rib 3
b, the safety piece 3c is fitted into the window hole 1d of the shaft cylinder 1, and the rear end of the safety piece 3c comes into contact with the step portion 1h at the front end of the elastic piece 1f provided on the base portion 1e of the clip 1a to prevent the slip-off prevention member. Be stopped.

FIG. 3 shows the above-mentioned ballpoint pen refill 5. Ink storage tube 1 for ballpoint refill 5
0 is filled with a low-viscosity ink or an ink having a shear thinning property, mainly a white pigment ink 11, and the trailing end of the ink is filled with a grease-like follower 12 that follows the ink as it is consumed. There is. Further, the follower 12 is not compatible with the ink and has the property of preventing the evaporation of the ink. If necessary, a resin-made follower rod having a specific gravity substantially equal to that of the follower 12 is immersed in the follower 12. The follower may be a follower such as silicon rubber.

The white pigment ink 11 contains a white pigment such as titanium oxide or polymer hollow fine particles and a gelling agent, and is blended so as to prevent the sedimentation of the pigment and prevent the fluidity from being impaired as much as possible. Is. In addition, since the ink has a shear thinning property, the viscosity is lowered by the rotation of the tip ball, and it is possible to perform coating with a high concealing property.

The joint 6 has a front shaft portion 6a in front of the collar portion 6b.
However, a rear shaft portion 6c is formed on the rear side, and the shaft portion 7a of the tip 7 holding the tip ball 8 is fixed to the tip fitting hole 6h at the tip of the front shaft portion 6a. The tip 7 is crimped so that the tip ball 8 is rotatably held in a state where the tip ball 8 is substantially in contact with a seat having a channel into which ink can flow. Further, the spring 9 is inserted in the inner hole portion of the tip 7, and the rear end of the shaft portion 7a of the tip is appropriately crimped so that the rear end of the spring 9 cannot be pulled out.

A linear rod shaft portion 9a is formed ahead of the spring 9, and the tip of the rod shaft portion 9a abuts the back surface of the tip ball 8 in a pressed state. Further, the tip ball 8 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 7 by its pressing. It is also possible to provide a pressing member for pressing the back surface of the tip ball 8 on the front surface of the spring, or to form the rod shaft portion into a coil shape of an extremely fine winding. Furthermore, it is possible to make the chip a resin molded product with excellent abrasion resistance and ink sealing performance, and to configure a spring seat that presses the back surface of the tip ball as an integral or separate spring seat. is there.

Further, it is extremely important that the tip ball 8 is in close contact with the inner surface of the ball holding portion for drying the writing tip and preventing direct current of the ink even if the ink has a high viscosity. That is, the ball-point pen mainly for erroneous correction correction as in the present application is
In order to increase the discharge amount of ink, the retracting dimension of the tip ball is set larger than that of a writing ballpoint pen. If necessary, the surface roughness of the inner surface of the chip that holds the tip ball 8, the inner surface of the chip to improve the precision of contact by crimping, and the secondary plastic working to improve the precision of crimping are considered. It If necessary, surface treatment or the like may be taken into consideration on the surface closely contacting the tip ball.

In order to completely prevent the backflow of ink, a valve chamber is provided behind the tip fitting hole 6d, and a valve body receiving seat having a tapered or spherical shape is provided at the rear portion of the valve chamber so as to communicate rearward. A hole is formed and a spherical valve element is loosely fitted in the valve chamber, and the guide hole is closed with the tip 7 facing upward to prevent backflow of ink. It is possible to regulate the rear end hole of the chip so as not to close it so that the ink flows into the inner hole of the chip. The valve body may be a shaft-like body having a tapered or spherical surface on the side in close contact with the valve body seat.

A rear shaft portion 6c is extended behind the collar portion 6b of the joint 6, and a cylindrical ink containing tube 10 is provided on the outer periphery of the rear shaft portion 6c with its front end at the rear end of the collar portion 6b. Abutted and press-fitted and fixed. As the ink containing tube 10, for example, a transparent PP resin or nylon resin molded product is used. Further, in the embodiment, the joint and the ink containing pipe are formed as separate members, but it is also possible to form the both as an integral resin molded product.

The ball-point pen refill 5 is fitted in the inner hole of the knock cylinder 3 or the inner hole or outer circumference of the bush 13 in a state where the rear end of the ink containing tube 10 is tightly fitted at the front end of the pressing mechanism. It In the embodiment, the inner hole portion of the ink containing tube 10 is fitted to the outer peripheral portion of the fitting shaft portion 13g provided in front of the bush 13. Also, the fitting shaft portion 1
The bushing and the ink containing tube can be tightly fitted to each other by forming a seal portion 13h on the outer peripheral portion of 3g by a circumferential projection. It is also possible to provide the seal portion as a separate member.

As described above, when the rear end of the knock bar 16 is pressed to move the knock cylinder 3 forward, the locking projection 3a pushes up the ball portion 1b of the clip 1a and moves to the front thereof, and the locking step portion 1c. The tip 7 of the ball-point pen refill 5 projects from the tip end hole 2 a of the tip shaft 2 when it is positioned to be engaged with. (Refer to FIG. 2) When the tip of the clip 1a is elastically displaced slightly upward or laterally to release the engagement between the locking step portion 1c and the locking projection 3a, the return spring 4 causes the ballpoint pen refill. 5 for safety piece 3
The dimensions of each part are appropriately set so that the tip 7 is retracted into the inside of the tip shaft 2 in a state of being retracted until c hits the step portion 1h of the elastic piece 1f. The ball-point pen refill 5 is replaced by removing the tip shaft 2 from the barrel 1, but when the ball-point pen 5 is not replaced, the barrel 1 is replaced.
The front shaft 2 and the front shaft 2 can be integrally formed.

[0027]

First, FIG. 1 shows a knock type writing instrument when it is carried. From this state, when the rear end of the knock bar 16 is pressed to move the knock cylinder 3 forward, the locking projection 3a pushes up the ball portion 1b of the clip 1a and moves to the front thereof to engage with the locking step portion 1c. At this time, the tip 7 of the ballpoint pen refill 5 projects from the tip hole 2a of the tip shaft 2. (See Figure 2)
In this state, the space between the back surface of the valve body 14 and the front end of the knock rod 16 communicates with the outside air through the slit portion 3d, and the setting force of the knock spring 18 with respect to the return spring 4 is sufficiently strong. It is well balanced. When the knock-type writing instrument is carried again, the tip of the clip 1a is elastically displaced slightly upward or laterally to release the engagement between the locking step portion 1c and the locking projection 3a. The ball-point pen refill 5 retracts, and the tip 7 sinks inside the tip shaft 2.

The operation of the pumping type pressurizing mechanism will be described below. When the rear end of the knock bar 16 is pushed forward from the state shown in FIG. 2, the front end 6f of the joint 6 is moved to the front shaft 2
The ball-point pen refill 5 comes into contact with the stepped portion 2b provided on the
The forward movement of the knock cylinder 3 and the knock rod 1 are prevented.
Only 6 start to move forward. When the outer peripheral portion of the seal ring 17 comes into close contact with the entire inner peripheral portion of the ink containing tube 10, the valve body 1
The space between the rear surface of 4 and the front end of the knock rod 16 is shielded from the outside air, and the knock rod 16 further advances so that the outer peripheral portion of the seal ring 17 closely contacts the inner peripheral surface of the knock cylinder 3. It slides and the internal pressure rises as the space decreases. In addition, the convex portion 16 provided at the front end of the knock rod 16 is released so that the close state of the knock rod 16 with the receiving seat 13d of the valve body 14 is released in a state where the space is appropriately compressed by advancing the knock rod 16.
When d contacts the rear end of the valve body 14 and the pressurized air is pushed in front of the valve body, the rear end of the follower 12 is pressurized and the fluidity of the ink to the tip side is supported. .

This means that the ink is separated from the peripheral surface of the tip ball due to drop impact or poor fluidity of the ink, and the continuous outflow of ink is interrupted. It becomes the action to do. In addition, an appropriate pressure is set depending on the characteristics of the ink. In that case, when the outer peripheral portion of the seal ring 17 is in close contact with the entire inner peripheral portion of the knock cylinder 3, the volume of the first space portion and the convex portion 16d provided at the front end of the knock rod 16 are the rear end of the valve body 14. It is possible to set how much the volume of the space portion when it comes into contact with the seal portion is taken into consideration and the leak value of the seal portion is taken into consideration. Further, by contacting the rear end of the valve element 14 with the convex portion 16d, the pressing force can be set and maintained even if the strength of the spring 15 that presses the convex portion 16d varies more than a predetermined strength.

Next, the function of the ballpoint pen 5 will be described. First, in a state where no writing is performed, the tip ball 8 is brought into close contact with the inner edge of the chip holding portion by the pressing of the spring 9, so that direct current and backflow of the ink 11 are prevented. Further, since the tip ball 8 is slightly retracted by the writing pressure, a gap is created to allow the ink to flow out, and the writing causes the ink to flow out by the rotation of the tip ball 8 for writing. Even if the spring 9 is not pressed, the rear end of the follower is pressed if the viscosity of the ink is too low, the ink filling amount is too large, or the ink containing tube is too thick. Ink can prevent direct current and backflow. However, it is desirable to press with the spring 9 in order to prevent direct current and backflow of the ink in consideration of writing with the tip 7 facing upward, and repeated knocking impact when mounted on a knock-type writing instrument.

The follower rod is used when the ink containing tube has a large diameter. That is, the grease-like follower has a problem that when the ink containing portion has a large diameter, it is easily deformed and destroyed by the influence of impact or the like. The rigidity can be increased by immersing a resin follower rod having a specific gravity substantially equal to that of the follower in the follower.

The direct current and the reverse flow of the ink are achieved by pressing the tip ball with a spring. The tip ball is brought into close contact with the inner edge of the ball holding portion by the spring, and the valve element is loosely fitted behind it. By providing the valve chamber side by side so that the valve body faces the tip and closes the guide hole, the state in which the ball holding part is not in close contact with the tip ball due to machining variations and the ball holding part and the tip ball It is possible to reliably prevent backflow of ink even if an incomplete contact state occurs when a solid substance adheres to the gap between and.

The ink backflow prevention structure having the follower rod and the valve body described above exhibits performance when the ink containing portion has a large diameter and easily backflows, or when repeated upward writing or when an impact is applied. However, it is not essential as a component, and a ballpoint pen for correcting erroneous writing is not always necessary because it is rarely used upward.

[0034]

The construction and operation of the knock-type writing instrument of the present invention are as described above, and the ballpoint pen using the ink which easily runs out of ink in the initial writing can be written by being assisted by the pressing action. Further, a white pigment ink containing at least a white pigment such as titanium oxide and hollow polymer particles and a gelling agent, which is mixed so as to prevent the sedimentation of the pigment and not impair the fluidity, and a pressure mechanism by pumping. By providing, there is no problem that the white pigment and the solvent are separated as in the conventional case, therefore it is not necessary to stir the ink, and the side surface of the container is not pressed at the time of writing. It is possible to provide a knock-type writing instrument that is easy to use and can be used to correct erroneous writing without being removed. Also,
Since the pumping type pressurizing mechanism is built into the knock type writing instrument main body, the ballpoint pen refill becomes the same as a normal one, and the pressure type knock type writing instrument can be provided at low cost.

Further, by bringing the convex portion 16d provided at the front end of the knock bar 16 into contact with the rear end of the valve body 14, it is possible to set an appropriate pressing force depending on the characteristics of the ink. Further, even if the strength of the spring 15 that presses the convex portion 16d varies in a direction stronger than a predetermined strength, the pressing force can be set and maintained.

[Brief description of drawings]

FIG. 1 is a partially non-sectional longitudinal sectional view of a knock-type writing instrument according to an embodiment of the present invention, showing a state in which a writing tip is depressed.

FIG. 2 is a vertical cross-sectional view of a partial non-cross section in a state where a writing tip is projected by knocking.

FIG. 3 is a vertical cross-sectional view showing the entire ball-point pen refill.

FIG. 4 is an enlarged sectional view showing a pumping type pressurizing mechanism.

[Explanation of symbols]

1-axis cylinder 1a clip 1b Tambe 1c Locking step 1d window hole 1e base 1f elastic piece 1g slope 1h step 2 front axle 2a Tip hole 2b step 2c inner step 3 knock tubes 3a Locking protrusion 3b rib 3c Safety piece 3d slit part 3e Tapered slit part 3f step 3g step 4 Return spring 5 Ballpoint pen refill 6 joints 6a Front shaft 6b collar part 6c Rear shaft 6d chip fitting hole 6e Step 6f front end 7 chips 8 tip ball 9 springs 9a Rod shaft 10 Ink storage tube 11 ink 11a space part 12 Follower 13 bush 13a Slot section 13b elastic piece 13c step 13d pedestal 13e vent 13f locking part 13g Fitting shaft 13h Seal part 14 valve body 15 spring 16 knock bars 16a protrusion 16b step 16c groove 16d convex part 17 seal ring 18 knock spring

Claims (5)

[Claims] 1. A ball-point pen refill in which a tip of a ball-point pen and an ink storage tube in the rear are provided, and the ink storage tube is filled with ink and a follower that follows the ink at the rear end of the ink, and the ball-pen refill is removable. A knock-type writing instrument that can be mounted on a shaft to lock the tip of the tip into the retracted state, and with the tip of the tip protruding, press the knock on the rear end of the barrel. By doing so, the pumping type pressurizing mechanism is operated, air is pushed into the rear end hole of the ink containing tube tightly fitted to the front end of the pressurizing mechanism part, and at that time, the valve opens at a predetermined pressure and the follower A knock-type writing instrument characterized in that fluidity of ink to the tip side is supported by pressurizing the rear end. 2. A spring pressure is applied to the back surface of the tip ball so that the tip ball comes into close contact with the inner edge of the ball holding portion at the tip of the chip, and the ink containing tube is made of titanium oxide, polymer hollow fine particles, or the like. The knock-type writing instrument according to claim 1, which is filled with a white pigment ink containing a white pigment and a gelling agent, which is mixed so as to prevent the sedimentation of the pigment and prevent the fluidity from being impaired as much as possible. 3. A pumping type pressurizing mechanism is provided with a tapered or spherical receiving seat and a vent hole at its axial center in an inner hole of a bush integrally provided behind the knock cylinder inner hole. With a valve mechanism section in which a valve body is provided by a spring so as to be in close contact with a receiving seat, and behind the valve mechanism section, with a knock spring, a knock rod is always urged rearward with respect to a knock cylinder, In addition, the knock rod is locked so that it can be retracted forward, and the outer peripheral portion of the knock rod is provided so as to be in close contact with the peripheral surface of the knock cylinder inner hole, and when the knock rod is advanced, it is between the vent hole and the front end of the knock rod. The knock-type writing instrument according to claim 1, comprising a knock mechanism section provided so as to compress the formed space section. 4. The knock-type writing instrument according to claim 3, wherein a rear end hole of the ink containing tube is tightly fitted to a fitting shaft portion provided in front of the bush. 5. A protrusion that abuts on the rear end of the front end valve body of the knock rod so that the close contact state of the valve body is released in a state where the space is appropriately compressed by advancing the knock rod. The knock-type writing instrument according to claim 3.