JP2004338161A - Pressurization type writing instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance pressurization effects and avoid the risk of a fall of an ink drop, by performing pressurization by advance of a pushing body and making pressure same as the pressure of outside air by retreat of the pushing body. <P>SOLUTION: In a pressurization type writing instrument, a refill, wherein the ink is provided in an ink storage pipe and wherein a follower is arranged at the rear end of the ink, is provided, and a pumping type pressure mechanism part is provided at the rear end of a barrel whereon the refill is mounted. The pressure mechanism part is provided with the pushing body which is locked so as to be capable of advancing with respect to the barrel via a spring, and a ventilation passage which is positioned in a front shaft part of the pushing body and which makes a front end of the shaft part and a part in the rear of the shaft part communicate with a groove part and a rear end side in the groove part. A seal ring, which is closely inserted into the groove part, gets close to the rear end side in the groove part when the pushing body is operated for advance, and slides in a state wherein the ventilation passage is blocked, so that a rear end of the follower can be pressurized. When the pushing is retreated, the seal ring gets close to a front end side in the groove part so that the ventilation passage can be opened, and the rear end of the follower can be retreated in the state of communicating with the outside air. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial applications]
According to the present invention, an ink storage tube is provided behind a writing tip, a follower that follows the ink and the ink is consumed at the rear end of the ink storage tube is disposed in the ink storage tube, and a pumping type pressurizing mechanism is further provided behind the follower. The present invention relates to improvement of a writing instrument provided with a part.
[0002]
[Prior art]
[Patent Document 1] JP-A-8-52407
[Patent Document 2] Japanese Patent Publication No. Hei 7-506682
[Patent Document 3] JP-A-2001-150865
[Patent Document 4] JP-A-2001-121885
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. In addition, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of the ink becomes small, the ink is not ejected even if the side wall of the container is strongly pushed. (Patent Document 1)
There is also known an ink having a shear thinning property, which does not need to be stirred, but there is a problem that the ink flows backward when the ink is applied upward, and the ink easily runs out. (Patent Document 2)
In addition, a pumping type pressurizing mechanism is provided at the rear end of the barrel, and is located in front of the rear end of a follower arranged so as to be in contact with the rear end of the ink and to follow with the consumption of ink. A valve mechanism is provided, and air is pushed into the rear end hole of the shaft cylinder by the forward operation of the pressurizing mechanism, and at this time, the valve opens at a predetermined pressure and the rear end of the follower is pressurized. There has been proposed one configured to support the flowability of the ink to the chip side. (Patent Document 3)
However, this has a drawback that the structure is complicated and the cost is high.
In addition, there is a problem that when the internal pressure exceeds a set value because ink is kept in a pressurized state when not in use, care must be taken to prevent the ink from being ejected carelessly.
Further, a pumping type pressurizing mechanism is provided at the rear end of the barrel, and air is pushed into the rear end hole of the ballpoint pen refill by the forward operation of the pumping, and the rear end of the follower is pressurized. Proposals have been proposed for the improvement of the invention, which is designed to support side flow. (Patent Document 4)
This has a drawback that the pressurizing effect is not maintained because when the push body is released from the forward movement, it retreats and becomes the same as the outside air. In addition, since the device is retracted from the pressurized state under the influence of reduced pressure, there is a problem that the pressurizing effect is not sufficient.
[0003]
In general, ballpoint pens that use low-viscosity inks or inks that have low shear viscosity have a large amount of outflow of ink (to increase the writing density) and use a large diameter ink reservoir tube to increase the amount of ink loaded. . In addition, since the viscosity of the ink is smaller than that of the oil-based ballpoint pen, the flow resistance to the ink storage tube is small. Accordingly, ink leakage (ink flows backward at the rear end of the ink storage tube) is likely to occur due to the ink's own weight, dropping, or knock impact. For this reason, the ink usually moves following the ink consumption at the time of writing at the rear end of the ink.However, a grease-like follower that suppresses the backflow of the ink against its own weight or impact is provided. A rod is provided immersed in the follower. However, even when the follower is provided, if the ink on the back surface of the ball of the chip is depleted when writing upward, there is a danger that the ink or the head will be added directly, causing a remarkable backflow and soiling the hands and clothes. Further, since the viscosity of the ink is low and the amount of outflow is large, there is a problem that the ink is oozed (DC) when a gap is formed between the tip ball and the tip holding portion when the tip side is directed downward.
In particular, in the case of a liquid applicator that uses a white pigment to correct mistakes, etc., the size at which the tip ball recedes due to pen pressure due to increasing the flow rate of ink or eliminating clogging due to drying. 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]
[Problems to be solved by the invention]
The present invention is a ballpoint pen that uses ink that is easy to break off during initial writing, a ballpoint pen that is mixed with various fillers in the ink, a ballpoint pen that is filled with ink that can be easily erased by rubbing the handwriting written on the paper with an eraser, A pen and the like that can be corrected by concealing erroneous writing or the like by concealing them with white ink can be written with the aid of a pressurizing action excellent in pressurizing effect. Further, it is possible to easily set an appropriate pressing force, and it is possible to avoid a problem that ink is blown out even when an external force is inadvertently applied to the writing tip when the ballpoint pen is not used. In addition, in the case of a ballpoint pen for correcting a typographical error, a white pigment ink containing a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent is formulated to prevent sedimentation of the pigment and not to impair the fluidity. By providing a pressurizing mechanism by pumping, there is no problem that the white pigment and the solvent are separated, so that there is no need to stir the ink and there is no need to press the side of the container during writing. It is possible to provide a good pressurized ballpoint pen.
[0005]
In addition, a writing instrument such as a marker pen, a marker, or the like, having a pen tip made of a porous body having continuous pores at its tip, a so-called plastic core formed by forming a complicated capillary in the axial direction, a fiber assembly, or the like, as a pen point. Ink that can be easily erased by rubbing with a eraser, the so-called correction ink that hides erroneous writing, etc. in white, so-called correction ink, metallic color ink, ink with lamé, pearly ink, and extremely strong writing lines Like high-speed inks, inks that contain pigment particles, polymer particles, metal powder, metal foil, mica, etc., and have high solids concentration, high viscosity, and shear-thinning inks can be used. Even if the viscosity of the ink is higher than a predetermined value or the colored fine particles are higher than a predetermined value, it is possible to avoid the problem that the pen tip is clogged and writing is impossible.
[0006]
[Means for Solving the Problems]
The present invention has the following configurations to achieve the above object.
The pressurized writing implement according to the first aspect of the present invention is provided with an ink storage tube at the rear of the writing tip, preventing the ink and the rear end of the ink from evaporating at the ink storage tube, and reducing the consumption of ink. A refill having a follower arranged to follow the ink, and the refill is mounted on a barrel, and a pumping type pressurizing mechanism is provided at the rear end of the barrel. In a pressurized writing instrument configured so that air is pushed into the rear end hole of the follower and the rear end of the follower is pressurized, the pumping type pressurizing mechanism has a rear end at the rear end of the barrel. A push body which is protruded from the shaft cylinder via a spring so as to be able to move forward, a circumferential groove portion in a front shaft portion of the push body, and a front end of the shaft portion in a rear end side in the groove portion A ventilation path is provided to communicate the The seal ring is closely inserted into the groove so as to be able to move back and forth, and when the push body is moved forward, the outer periphery of the seal ring is closed in a state where the seal ring is shifted toward the rear end side in the groove and the ventilation path is closed. The rear end of the follower is pressurized by sliding closely on the inner peripheral portion of the rear end hole of the ink storage tube, and when the pressing body is retracted, the seal ring moves toward the front end side in the groove to open the ventilation path, The rear end of the follower is configured to be able to retreat in a state where the rear end communicates with the outside air.
[0007]
A pressure-type writing instrument according to the invention according to claim 2 is provided with an ink storage tube behind the writing tip, preventing the ink and the rear end of the ink from evaporating at the ink storage tube, and reducing the consumption of ink. A refill having a follower arranged to follow the ink, and the refill is mounted on a barrel, and a pumping type pressurizing mechanism is provided at the rear end of the barrel. In a pressurized writing instrument configured so that air is pushed into the rear end hole of the follower and the rear end of the follower is pressurized, the pumping type pressurizing mechanism has a rear end at the rear end of the barrel. The push body is protruded from the shaft cylinder via a spring so as to be able to move forward, and a circumferential groove is inserted into the front shaft of the push body, and a seal ring is closely inserted into the groove. Seal ring when the body moves forward The outer peripheral portion is slid on the closely to the rear end hole peripheral portion of the ink reservoir tube with the rear end of the follower is pressurized, comprising a locking device is provided to prevent retraction of the push bodies.
[0008]
【Example】
1 to 7 show an embodiment of a pressure-type writing instrument according to the present invention, in which a writing tip has a ball-point pen tip.
First, a white pigment ink 9 is filled in the ink storage tube 2 of the ball-point pen refill 1 shown in FIG. 1, and a grease-like follower 10 that follows the ink as the ink is consumed is filled in the rear end of the ink. In addition, the follower is not compatible with the ink and has a function of preventing the evaporation of the ink. A follower rod 11 made of resin having a specific gravity substantially equal to that of the follower is immersed in the follower as needed. The follower may be a follower such as a silicone rubber.
[0009]
Further, the white pigment ink 9 contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent, and is formulated so as to prevent sedimentation of the pigment and to minimize the loss of fluidity. It is. In addition, since the ink has a shear thinning property, it is possible to perform coating with a high concealing property in combination with a decrease in the viscosity as the tip ball rotates.
[0010]
Further, as shown in the figure, the joint 4 has a front shaft portion 4a formed in front of the flange portion 4b and a rear shaft portion 4c formed in the rear, and holds the tip ball 6 in a chip fitting hole 4d at the tip of the front shaft portion 4a. The shaft 3b of 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.
[0011]
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.
[0012]
Further, a linear rod portion 7 a is formed in front of the spring 7, and the tip of the rod portion 7 a contacts the back surface of the tip ball 6 in a pressing manner. The tip ball 6 is brought into close contact with the inner edge of the ball holding portion 3a (formed by caulking or the like) of the chip 3 by the pressing. In addition, it is possible to provide a pressing member for pressing the back surface of the tip ball 6 on the front surface of the spring, or to make the rod shaft portion into an extremely fine coil shape.
Further, it is also possible to form the chip into a resin molded product having excellent abrasion resistance and ink sealing performance, and to provide a spring seat for pressing the back surface of the tip ball as an integral or separate spring seat. is there.
[0013]
Further, it is extremely important that the tip ball 6 is in close contact with the inner surface of the ball holding portion 3a, even if the ink has a high viscosity, for drying the writing tip and preventing direct current of the ink.
That is, in order to increase the discharge amount of ink, the ballpoint pen for error correction coating 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. In addition, if necessary, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.
[0014]
A valve chamber 5 appropriately eccentric with the axis of the chip 3 is provided behind the chip fitting hole 4d, and a tapered or spherical valve body is provided at the rear of the valve chamber 5 so as to communicate with the guide hole 5b. A receiving seat 5a 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 valve element 8 comes into contact with a state where the valve element 8 is biased to the rear end of the shaft portion 3b of the chip with the chip 3 facing downward. The ink flowing from the guide hole 5b through 5c or the like flows into the inner hole of the chip.
Note that the valve body may be a shaft-like body having a tapered or spherical surface on the side close to the valve body receiving seat. In this case, it is not necessary to decenter the valve chamber with respect to the chip axis as described above by forming a groove through which ink flows into the chip on the peripheral surface on the side that comes into contact with the rear end of the shaft portion of the chip. .
[0015]
FIG. 7 shows another embodiment of the ballpoint pen refill. The difference from the above-mentioned ball-point pen refill 1 is that it does not have a valve element and a follower rod.
That is, the valve element and the follower rod are not essential components.
Details will be described later in the operation.
[0016]
A rear shaft portion 4c extends behind the flange 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 by contacting the front end thereof to the rear end of the flange portion 4b, and the inner diameter portion of the ink storage tube 2 is conducted to the guide hole 5b of the joint 4. I have. The ink storage tube 2 is made of, for example, a transparent PP resin molded product. In the ball-point pen of the above-described embodiment, the joint and the ink storage tube are formed as separate members, but they may be formed as an integral resin molded product.
[0017]
Next, FIG. 2 and FIG. 3 show an embodiment of a ballpoint pen as an applicator in which the ballpoint pen refill 1 is mounted on a shaft main body. The shaft body is mainly composed of a cap 17, a shaft cylinder 15, a mouth portion 16, and a push body 12.
First, as shown in the drawing, the shaft cylinder 15 is a resin molded product, and has a detachable lip portion 16 on the front side thereof, and an engaging portion comprising a protrusion and a groove portion on the outer periphery slightly rearward, and an engaging portion. At the rear end, a step portion with which an end portion of a cap 17 described later abuts is formed. In addition, a step 16 a is formed on the peripheral surface of the inner hole of the lip 16.
The ball-point pen refill 1 is inserted from the front end of the barrel 15, the rear end of the flange 4 b of the joint 4 abuts on the front end of the barrel 15, and the lip 16 is joined to the outer periphery of the front end of the barrel by screwing or the like. Then, the rib 4e provided on the outer periphery of the joint 4 engages with the step 16a of the lip, and the tip of the tip 3 projects from the tip hole of the lip 16.
[0018]
On the other hand, a pressure mechanism is provided at the rear end of the shaft cylinder 15.
First, a step 15c is formed in the rear end hole of the shaft cylinder 15. The push body 12 has a step portion 12a in the front, a flange portion 12b in the front, and a shaft portion 12c in the front. Further, a hole 12f is provided on the front end side of the shaft portion 12c, a groove 12d is provided on the peripheral surface of the shaft portion 12c, and a small hole 12e is formed on the rear end side of the groove toward the hole 12f. An air passage is provided for communicating the front end of the shaft portion and the outer periphery of the rear portion of the shaft portion. A seal ring 13 made of an elastic material such as rubber is closely inserted into the groove 12d, for example. The seal ring 13 is slidable in the front-rear direction in the groove while being in close contact with the peripheral surface of the groove 12d.
As will be described later, when the pushing body 12 is moved forward, the seal ring 13 moves toward the rear end side in the groove and the small hole 12e is closed. When the rear end of the follower 10 slides closely on the inner peripheral portion, the rear end of the follower 10 is pressurized, and when the push body 12 is retracted, the seal ring 13 is moved toward the front end side in the groove to open a small hole 12e, and the follower 10 is closed. The rear end is configured to be able to retreat in a state where the rear end communicates with the outside air.
[0019]
The push body 12 is inserted from the rear end of the barrel 15, and a spring 14 is laid between the step 12 a of the push body and the rear surface of the step 15 c of the barrel, and the flange 12 b is attached to the front of the step 15 c. The pushing body 12 is constantly urged rearward with respect to the shaft cylinder 15 by the spring 14. Further, the front of the shaft 12c of the push body is fitted into the rear end hole of the ink container 2 of the ballpoint pen refill, and the outer periphery of the seal ring 13 is in close contact with the inner periphery of the ink container 2. At this time, the seal ring 13 is shifted toward the front end side of the groove portion 12d, the small hole 12e is opened, and the rear end hole of the ink storage tube communicates with the outside air. (Although not specifically shown, the inside of the barrel 15 is communicated with the outside air. The means is easy and various means are provided depending on the design convenience.)
[0020]
A protruding portion 12g is formed on one side of the step portion 12a of the pushing body 12, while a vertical groove 15d and a circumferential groove 15e are provided in a hook shape on a rear end side peripheral surface of the shaft cylinder 15, and the protruding portion 12g is formed. Are fitted in the vertical grooves 15d. The push body 12 is moved forward to rotate the push body 12 in a state where the rear end of the follower 10 is pressurized, and the protrusion 12g is engaged with the circumferential groove 15e to prevent the push body 12 from retreating. . (Note that such a lock device can be provided in various ways depending on the design convenience. See FIG. 4.)
[0021]
FIG. 5 shows the embodiment described above without a locking device. That is, an initial pressure is applied to the ink that is difficult to flow by the pumping operation of the pressing body, and the ink is communicated with the outside air by retreating.
Also, FIG. 6 shows that the rear end hole of the ink storage tube is communicated with the outside air by the vent hole 19 immediately before the pushing body moves forward, and the rear end hole of the ink storage tube is shut off from the outside air immediately after the forward movement. And pressurized together. In this case, there is provided a lock device that rotates the push body in a state where the push body is moved forward and the rear end of the follower is pressurized, and the protrusion engages with the circumferential groove to prevent the push body from retreating. Is provided.
The means for communicating the rear end hole of the ink storage tube with the outside air may be provided by appropriately setting the inner circumference of the ink storage pipe at the position where the seal ring is located to be larger than the outer circumference of the seal ring, or by providing a vertical groove communicating with the inner circumference. It can also be achieved by providing.
[0022]
By the way, the cap 17 fitted to the front of the shaft cylinder 15 is a resin molded product having excellent elasticity. The clip 15b is located on the outer peripheral side surface, and the rear end cylinder is pressed against the rear end hole of the cap. I have. In addition, a ventilation hole penetrates through the rear end of the cylindrical portion of the clip. A cylindrical inner cap 17a having a small chamber is provided behind the inner hole of the cap 17, and the inner cap 17a is integrally connected to the cap inner hole by a required number of ribs. As described above, a ventilation path communicating with the ventilation hole from the cap insertion port is formed between the ribs, and serves as a secure ventilation means in the event that an infant swallows the cap. A seal plug 18 made of a non-liquid-absorbing, non-continuous-cell elastic body is fixed to the tip of the small chamber of the inner cap 17a. When the cap is fitted, the tip 3 and the tip 16 are closed. The tip of the tip is closely contacted with the seal plug 18 while being substantially fitted in the small chamber.
[0023]
Further, the pressurized writing instrument of the present invention is a pen tip having a porous body having continuous pores at the tip, a so-called plastic core formed by forming a complicated capillary tube in the axial direction, a fiber assembly, and the like. A pen core such as a felt-tip pen or a marker is provided, a follower for following the ink is arranged at the rear end of the ink in the ink storage section at the rear, and the above-described pumping type pressurizing mechanism is further provided behind the ink follower. And a pressurized writing instrument. In addition, the form of the writing tip can basically correspond to a form composed of a normal felt-tip pen, a marker, or the like. If necessary, the pen core is fixed to the front shaft by a positive locking portion, or an ink leakage preventing portion is provided between the outer peripheral portion of the pen core and the peripheral surface of the insertion hole of the front shaft.
[0024]
[Action]
Next, the operation of the embodiment will be described below.
First, the push body 12 is pumped, and the seal ring 13 moves forward in a state where the small hole 12e is closed toward the rear end side of the groove 12d provided in the shaft portion 12c of the push body, and is shut off from the outside air. The rear end of the follower 10 is pressurized.
This has the effect of preventing ink from separating from the peripheral surface of the tip ball due to drop impact and poor ink fluidity, etc. Become.
[0025]
When the push body 12 is rotated to one side in a state where the push body 12 is moved forward most, the protruding portion 12g of the push body is inserted into the circumferential groove 15e of the shaft cylinder, so that the push body 12 is prevented from retreating. The ends are kept pressurized. When the push body 12 is rotated in the opposite direction from this state, the blocking state is released and the push body retreats. At this time, the seal ring 13 is provided on the front end side of the groove 12d provided in the shaft 12c of the push body. The small hole 12e is opened, and retreats in a state where it is communicated with the outside air, so that the rear end of the follower 10 can retreat without being depressurized to the outside pressure or less. Therefore, there is no concern that the pressurizing effect is reduced unlike the related art. (However, strictly speaking, the sliding interval between the time when the seal ring 13 is shifted toward the front end side of the groove 12d and the time when the small hole 12e is opened acts in the direction of pressure reduction.)
[0026]
In addition, the push body is constituted from the rear end side by a shaft portion provided with a knock bar, a rotor, and a seal ring (a mechanism used for a knock-type ballpoint pen or the like in order to make a writing tip come and go) to perform a knock operation. It is also possible to alternately move the shaft part back and forth.
[0027]
By the way, the frictional resistance between the inner peripheral surface of the seal ring 13 and the peripheral surface of the groove 12d of the pressing body is sufficient for the frictional resistance between the inner peripheral surface of the ink storage tube 2 and the outer peripheral surface of the seal ring 13. If necessary, the shaft of the push body (the shaft may be provided separately from the body of the push body) may be made of a material with a small coefficient of friction, or the outer surface of the seal ring may be removed if necessary. The inner surface of the seal is formed into a soft two-layer structure, or the inner surface of the seal ring or the peripheral surface of the groove of the pressing body is subjected to a treatment for reducing frictional resistance. Basically, the seal ring may be loosely fitted in the groove except for the state where the seal ring is shifted toward the rear end side of the groove of the push body (the small hole is closed).
[0028]
Next, the operation of the ballpoint pen refill will be described.
FIG. 1 shows a state in which the tip 3 is turned upward, and the backflow of ink is prevented because the tip ball 6 is brought into close contact with the inner edge of the tip holding portion 3a by the pressing of the rod 7a of the spring 7. . Also, at this time, since 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 is written upward and the ink on the back surface of the tip ball 6 of the chip is depleted, the head is kept in the ink. There is no backflow. Therefore, when the tip 3 is turned downward, the ink can immediately flow out.
By the way, in the structure without the 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 the ink tends to be hardly immediately discharged in the downward writing. The follower rod 11 is used when the ink storage tube has a large diameter. That is, the grease-like follower 10 has a problem that when the ink container tube has a large diameter, the ink container tube is easily deformed and broken 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.
[0029]
In a writing state in which the tip 3 is directed downward, the valve element 8 abuts on one of the rear ends of the tip in a state of being biased, and the other end has a groove portion 5c through which ink can flow into the tip 3. 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 surface of the tip ball 6 of the chip 3 through the groove 5c.
[0030]
In this state, the tip ball 6 is brought into close contact with the inner edge of the tip holding portion 3a by the pressing of the rod shaft portion 7a of the spring 7, so that the direct current of the 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 rotation of the tip ball 6 by writing, and erroneous writing and the like are concealed by the ink. You.
[0031]
The above-described ink backflow prevention structure having a follower rod and a valve element exhibits performance when the ink storage tube has a large diameter and easily flows back, or when repeated upward writing or when an impact is applied. It is not essential as a component, and a ballpoint pen for correcting clerical errors is not necessarily used because it is rarely used upward.
[0032]
Next, a case where the writing tip is a pen core will be described.
For example, in the case of an ink that can be easily erased with an eraser, if the coloring fine particles of the ink are small, there is a problem that the ink penetrates into the fibers of the paper and the erasability is deteriorated. Also, if it is too large, there is a problem that the dispersion stability of the colored fine particles is reduced and the pen tip is clogged, the coloring is poor, and a clear color drawing cannot be obtained, and the particle size of the colored fine particles is 1 to 20 μm. , Preferably about 2 to 10 μm.
Also, if the viscosity of the ink is too low, the colored fine particles are easily separated, and if the viscosity is too high, if the pen tip is left with the pen tip exposed, the pen core becomes clogged in a very short time, making writing impossible. And the viscosity of the ink is 5 to 35 mpa. sec, a pen core made of a fiber aggregate is 10 mpa. It is said that it should be less than sec.
[0033]
The pen core used in the present invention is a so-called plastic in which a needle-like complicated capillary is formed in the axial direction by a porous body having continuous pores (urethane-like or hard sintered body), extrusion molding or the like. It consists of a core, a fiber assembly, etc., but has the function of not relying only on the ink's own weight or capillary action as the ink outflow function.
In addition, inks that exceed the upper limit of the viscosity range of inks applied to ordinary pen cores and inks that exceed the upper limit of the particle size of the colored fine particles can be handled, and have pores that do not clog the pen tip, If necessary, reduce ink wetting. (For example, the material selection and surface treatment of the pen core are performed so as to be smaller than the surface tension of the ink and to repel the ink.)
That is, the outflow accompanying the writing of the ink is possible with the aid of the pressurizing action.
Also, if the air is communicated with the rear end of the follower when carrying it or not using it for a long period of time, it is possible to reliably prevent ink dripping from the pen tip and clogging of the pen tip. .
[0034]
【The invention's effect】
The present invention is a ballpoint pen that uses ink that is easy to break off during initial writing, a ballpoint pen that is mixed with various fillers in the ink, a ballpoint pen that is filled with ink that can be easily erased by rubbing the handwriting written on the paper with an eraser, In ballpoint pens and the like, which can be corrected by concealing errors and the like with white ink, when the push body is released, the push body retreats from the pressurized state without being affected by decompression, and the trailing end of the follower Is the same as the outside air, the pressurizing effect is maintained, and the pressurized state retreats without being affected by the pressure reduction, so that a continuous pressurizing effect can be expected.
[0035]
In addition, a writing instrument such as a marker pen, a marker, or the like, having a pen tip made of a porous body having continuous pores at its tip, a so-called plastic core formed by forming a complicated capillary in the axial direction, a fiber assembly, or the like, as a pen point. Ink that can be easily erased by rubbing with a eraser, the so-called correction ink that hides erroneous writing, etc. in white, so-called correction ink, metallic color ink, ink with lamé, pearly ink, and extremely strong writing lines Like high-speed inks, inks that contain pigment particles, polymer particles, metal powder, metal foil, mica, etc., and have high solids concentration, high viscosity, and shear-thinning inks can be used. Thus, even when the viscosity of the ink is higher than a predetermined value or the colored fine particles are higher than a predetermined value, it is possible to avoid the problem that the pen tip is clogged and writing is impossible.
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional view showing the entire ballpoint pen refill used in the present invention, showing a state in which a chip is directed upward.
FIG. 2 is a cross-sectional view showing the front half of the pressurized writing instrument of the present invention, showing a state in which a cap is fitted to the front end of a barrel.
FIG. 3 is a cross-sectional view showing a rear half of the pressurized writing instrument of the present invention.
FIG. 4 is a cross-sectional view showing a rear half of a pressure-type writing instrument in a pumped state.
FIG. 5 is a longitudinal sectional view showing a rear half of a pressurized writing instrument according to another embodiment of the present invention.
FIG. 6 is a longitudinal sectional view showing the rear half of a pressurized writing instrument according to another embodiment of the present invention.
FIG. 7 is a longitudinal sectional view showing the whole of a ballpoint pen refill according to another embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 ballpoint pen refill 2 ink storage tube 3 tip 3a ball holding portion 3b shaft portion 4 joint 4a front shaft portion 4b flange portion 4c rear shaft portion 4d chip fitting hole 4e rib 5 valve chamber 5a valve body receiving seat 5b guide hole 5c groove portion 6 Tip Ball 7 Spring 7a Rod Shaft 8 Valve 9 Ink 10 Follower 11 Follower Rod 12 Pusher 12a Step 12b Flange 12c Shaft 12d Groove 12e Small Hole 12f Hole 12g Projection 13 Seal Ring 14 Spring 15 Shaft Tube 15a Shaft 15b Clip 15c Step 15d Vertical groove 15e Peripheral groove 16 Toe 16a Step 17 Cap 17a Inner cap 18 Seal plug 19 Vent hole

Claims (2)

A refill having an ink storage tube at the back of the writing tip, the ink storage tube being provided with an ink and a follower at the rear end of the ink for preventing evaporation of the ink and following the ink as the ink is consumed; A refill is mounted on the barrel, and a pumping-type pressurizing mechanism is provided at the rear end of the barrel. By the forward operation of the pumping, air is pushed into the rear end hole of the ink storage tube, and the rear end of the follower is moved. In a pressurized writing instrument configured to be pressurized,
The pumping-type pressurizing mechanism has a push body that projects from the rear end of the barrel and protrudes from the barrel via a spring so that it can move forward with respect to the barrel, and a front shaft part of the push body. A circumferential groove and a ventilation path communicating with the front end of the shaft and the rear outer periphery of the shaft are provided on the rear end side in the groove, and the seal ring is closely inserted in the groove so as to be able to move back and forth, and is pushed. When the body is moved forward, the outer periphery of the seal ring slides closely on the inner periphery of the rear end hole of the ink storage tube in a state where the seal ring is shifted toward the rear end side in the groove and the air passage is closed. When the rear end of the follower is pressurized and the push body is retracted, the seal ring moves toward the front end side in the groove to open the ventilation path, so that the rear end of the follower can be retracted while communicating with the outside air. A pressurized writing implement composed of: A refill having an ink storage tube at the back of the writing tip, the ink storage tube being provided with an ink and a follower at the rear end of the ink for preventing evaporation of the ink and following the ink as the ink is consumed; A refill is mounted on the barrel, and a pumping-type pressurizing mechanism is provided at the rear end of the barrel. By the forward operation of the pumping, air is pushed into the rear end hole of the ink storage tube, and the rear end of the follower is moved. In a pressurized writing instrument configured to be pressurized,
The pumping-type pressurizing mechanism has a push body that projects from the rear end of the barrel and protrudes from the barrel through a spring, and that can be moved forward with respect to the barrel. The seal ring is closely inserted into the circumferential groove and the groove, and when the pushing body is operated forward, the outer peripheral portion of the seal ring slides closely on the inner peripheral portion of the rear end hole of the ink storage tube so that the follower is closed. A pressurized writing implement that has a locking device that presses the rear end and prevents the pushing body from retreating.

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