JP2006263928A - Ball-point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relieve a ball-point pen filled with an ink apt to run out or dry up easily during an initial writing operation of a possible trouble that the pen may cause an ink shortage or a thin spot. <P>SOLUTION: This ball-point pen is structured of a tip 2 of a ball-point pen fitted to the forward end, and an ink storage part, behind the tip 2, in which the ink 6 and a follower 7 movable following the exhaustion of the ink 6, at the rear end of the ink 6, are provided. In this ball-point pen, an ink flow rate regulator 4 capable of making smooth passage of the ink 6, is fitted in a tip inner hole, and the tapered apex part of the ink flow rate regulator 4 comes into contact with the back of an apex ball 3. Further, a coil-like spring 5 is installed at the rear end of the ink flow rate regulator 4 and the tapered apex part brings the apex ball 3 into close contact with the inner edge of a ball embracing part at the apex of the tip by the pressing of the spring 5. During writing, however, the close contact state is removed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a ballpoint pen that uses ink that is easy to run out of ink during initial writing, and a ballpoint pen that uses ink that is easy to dry. In addition, ballpoint pens with various fillers mixed in ink, ballpoint pens filled with ink that can be easily erased by scrubbing the eraser with the eraser, and writing errors on the paper surface. The present invention relates to an improvement of a ballpoint pen such as a ballpoint pen that satisfies the writing performance by supporting with pressure.

JP-A-8-52407 7-506862 JP 2001-150865 A Japanese Patent Application No. 2003-180370

(Patent Document 1) Conventionally, a liquid applicator using a white pigment for correcting an error or the like is known. In addition, since the white pigment and the solvent can be easily separated, this type of liquid applicator has a flexible container filled with ink, balls, and the like, and needs to be shaken and stirred in use. Further, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of ink decreases, there is annoyance that the ink is not ejected even if the side wall of the container is strongly pressed.
(Patent Document 2)
In addition, there is a known ink that does not need to be agitated by using ink having shear thinning viscosity, but there is a problem that the ink tends to run out when it is applied upward.
(Patent Document 3)
In addition, a pumping-type pressurizing mechanism is provided at the rear end of the shaft cylinder, and is positioned at the rear end of the follower that is disposed in front of the shaft cylinder so as to contact the rear end of the ink and follow the ink as it is consumed. The valve mechanism is disposed, and air is pushed into the rear end hole of the shaft cylinder by the forward operation of the pressurizing mechanism portion. At that 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 fluidity of the ink toward the tip side.
(Patent Document 4)
The tip flow ball is in close contact with the inner edge of the ball holding part at the tip of the chip, and an ink flow rate adjusting body with a protruding front end of the spring that presses the back of the tip ball is tightly attached to the chip inner hole so that the close state is released at the time of writing. The ink storage section behind the ink is provided with a follower that moves with ink consumption at the rear end of the ink, and the ink flow control body has ink repellency, and the rear of the follower has a knock. A pumping type pressurizing mechanism constituted by a mechanism part and a valve mechanism is provided.

In general, ballpoint pens that use low viscosity ink or ink with shear thinning viscosity have a large ink outflow (in order to increase writing density), and the diameter of the ink containing tube is increased to increase the amount of ink loaded. . Further, since the viscosity of the ink is smaller than that of the oil-based ballpoint pen, the flow resistance with respect to the ink containing tube is small.
Therefore, ink leakage (ink flows backward at the rear end of the ink containing tube) is likely to occur due to the weight of the ink, dropping or knocking impact. For this purpose, the ink usually moves following the ink consumption at the time of writing at the trailing edge of the ink, but a grease-like follower that suppresses the back flow of the ink against the ink's own weight or impact is also available. A rod is provided immersed in the follower. However, even if the follower is provided, the ink head is directly added when the follower is turned upward, and there is a risk that the backflow will occur and the hands and clothes will be soiled. In addition, when the tip side is faced down, there is a problem of ink bleeding (direct current) when a gap between the tip ball and the tip holding portion is generated. In addition, oil-based inks of quick-drying low-viscosity or medium-viscosity gels have a problem that the ink or the oily component of the ink easily penetrates into a minute gap between the tip ball of the chip and the inner surface of the ball holding portion and causes direct current. To do.

The present invention is a ballpoint pen that uses ink that is easy to run out of ink in the initial writing, a ballpoint pen that uses ink that is easy to dry, a ballpoint pen in which various fillers are mixed in the ink, and the handwriting written on the paper is scratched with an eraser. Ballpoint pens filled with ink that can be easily erased by using a white ink, corrections can be made by concealing misprints with white ink, no need to stir, and no need to stir the side of the container It is an object of the present invention to improve a ballpoint pen that can be normally written using the pressurizing action, and can be provided at low cost, and the pressurizing operation can be provided without trouble.
In addition, oil-based inks of quick-drying low-viscosity or medium-viscosity gels tend to cause direct current by penetrating the minute gap between the tip ball of the chip and the inner surface of the ball holding portion, and the oil component of the ink or ink. Evaporates and the ink in the gap dries easily, causing problems such as clogging and inability to write. In order to prevent ink evaporation and writing failure, the ink flow control body repels the ink so that ink is not sucked out from the tip of the tip when not writing, and the tip ball is in close contact with the inner surface of the ball holding part. It is necessary to prevent the ink from evaporating and drying, which can be easily realized.

The present invention has the following configuration in order to achieve the above-described problems.
The ballpoint pen according to the invention of claim 1 has a tip of a ballpoint pen at the front end and an ink storage portion at the rear thereof, and the ink storage portion has a follower that moves with ink consumption at the rear end of the ink. In the provided ballpoint pen, an ink flow rate adjusting body capable of communicating ink is inserted into the chip inner hole, and the tapered tip of the ink flow rate adjusting body comes into contact with the back surface of the tip ball, and the ink flow rate A coiled spring is laid at the rear end of the adjusting body, and the tapered tip closes the tip ball to the inner edge of the ball holding portion at the tip of the tip by pressing the spring, and the close state is released at the time of writing. As provided.

  A ballpoint pen according to a second aspect of the present invention is the ballpoint pen according to the first aspect, wherein an ink flow rate adjusting body having ink repellency and a pressurizing mechanism are provided behind the follower.

  According to a third aspect of the present invention, there is provided the ballpoint pen according to the second aspect, wherein the pressurizing mechanism is disposed at a substantially rear end in the shaft cylinder, and its inertia is obtained by swinging the shaft cylinder back and forth. It consists of a weight that moves back and forth with force, and a valve body that is provided at the rear end of the follower in front of the weight. It is pushed in and the rear end of the follower is pressurized so that the fluidity of the ink toward the tip is supported.

Ballpoint pens that use ink that is easy to run out of ink and ink that is easy to dry during initial writing can be written without problems such as running out of ink or dripping.
In addition, a ballpoint pen in which various fillers are mixed into the ink, a ballpoint pen in which the handwriting written on the paper is easily erased by rubbing with an eraser, and correction can be made by concealing the typographical error with white ink, There is no need to stir, and there is no inconvenience of pressing the side surface of the container. A correction ballpoint pen or the like can be written without the problem of ink breakage or clogging caused by pressurization. In addition, it can be provided at low cost, and the pressing operation can be provided without trouble.
Also, with a ballpoint pen that uses oil-based ink of quick-drying low-viscosity or medium-viscosity gel, the oil component of the ink or ink penetrates a minute gap between the tip ball of the chip and the inner surface of the ball holding part, and directs the direct current. It is easy to solve the problem that the oily component evaporates and the ink in the gap is dried and clogged or cannot be written.

  1 to 7 show an embodiment of the present invention. First, as shown in FIG. 1, the ballpoint pen of the embodiment includes a shaft cylinder 1, a tip 2, an ink 6, a follower 7, a valve body 12 provided at the rear end of the follower, a weight 9 provided at the rear thereof, and a shaft cylinder It is comprised with the tail plug 11 fixed to a rear end, and a cap is fitted by the front-axis | shaft part 1c as the final form of a writing instrument. Moreover, it can be used as a refill mounted on a knock-type writing instrument or a double-type writing instrument.

The shaft cylinder 1 is a resin molded product (usually a transparent resin), and has a tapered tip shaft portion 1c integrally formed at the tip, and an ink containing portion filled with ink and follower at the rear thereof. Further, a pressurizing mechanism described later is provided behind the ink containing portion.
Further, a joint portion (female screw portion) may be provided behind the ink storage portion, and the front portion of the shaft tube portion having the pressure mechanism may be detachably screwed.

As shown in the figure, the tip 2 is crimped so that the tip ball 3 is rotatably held in a state where the tip ball 3 is substantially in contact with a ball receiving seat 2e having a channel portion 2d through which ink can flow. ing. (Ball holding part 2c)
Further, an ink flow rate adjusting body 4 is closely mounted on the back surface of the tip ball 3 in the chip inner hole 2b, and a coiled spring 5 is inserted into the chip inner hole 2b from the rear side of the ink flow rate adjusting body 4. The front end of the ink flow rate adjusting body 4 presses the back surface of the tip ball 3, the rear end of the shaft portion 2a behind the tip is properly crimped, and the rear end of the ridge portion of the spring 5 is provided so that it cannot be removed. ing.
It is also possible to provide a step portion on the rear side of the tip and to bring the rear end of the winding portion of the spring into contact.
The ink flow rate adjusting body 4 is a core body having fine pores continuous in the axial direction, extruded, sintered body of resin, metal, ceramic, etc., fiber bundle solidified with binder, rubber-like elasticity Obtained by the body.
In addition, when the pressurizing action is used, it is not dependent on the capillary action as the ink outflow function as necessary. That is, the ink flow rate adjusting material is selected and surface-treated so as to reduce ink wetting and, for example, be smaller than the surface tension of the ink and repel the ink (having ink repellency).
The ink communicates in a state of a predetermined pressure or higher.

  It is very important for the tip ball 3 to be 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. In addition, the surface roughness of the inner surface of the chip that holds the tip ball 3 as necessary, the grinding of the inner surface to improve the caulking accuracy, and secondary plastic processing to increase the caulking accuracy are considered. The In addition, surface treatment or the like is considered on the contact surface with the tip ball if necessary.

  The shaft cylinder 1 has an ink containing portion behind the hole 1d, and the ink containing portion is filled with low-viscosity ink or ink having shear thinning viscosity, and ink is consumed at the rear end of the ink. It is filled with a grease-like follower 7 that follows the ink. Further, the follower 7 is not compatible with ink and has a performance of preventing ink evaporation. Further, if necessary, a resin-made follower rod 8 having a specific gravity substantially equal to that of the follower is immersed in the follower. The follower may be a follower such as silicon rubber.

  In the case of a ballpoint pen for correcting typographical errors, ink 6 contains a white pigment such as titanium oxide or polymer hollow fine particles and a gelling agent, and prevents the pigment from settling and prevents fluidity from being lost as much as possible. White pigment ink. In addition, since the ink has shear thinning viscosity, it can be applied with high concealability in combination with a decrease in viscosity due to rotation of the tip ball.

  Next, the pressurizing mechanism will be described. As shown in FIG. 3, the pressurizing mechanism is provided with a valve body 12 made of an elastic body such as rubber in contact with the rear end of the follower 7 in the shaft cylinder 1 and further rearward from the rear end of the shaft cylinder. A weight 9 that can move back and forth in the shaft cylinder without being escaped is provided, and the inertia when the shaft cylinder 1 is swung between the front end of the weight 9 and the valve body 12 when the weight 9 moves forward. Is compressed and pressurized, and the valve body 12 is opened at an appropriate pressure so that pressurized air flows into the rear end of the follower 7 so that the fluidity of the ink 6 toward the tip 3 is supported. Has been made. Further, when the weight 9 moves to the rear end side of the shaft cylinder 1, the space between the front end of the weight 9 and the rear end of the follower is in a state of communicating with the outside air.

  The valve body 12 is a cylindrical body made of an elastic body such as silicon rubber or other rubber, or a soft resin molded product, and a substantially spherical thin-walled portion bulging forward is formed in the inner hole portion thereof. A slit-like valve portion 12a is formed at the center portion. This valve body is configured such that the slit is opened by elastic deformation with respect to the pressurized air from behind the thin portion, and conversely the slit is closed with respect to the pressurized air from the front side of the thin portion. . The valve body can be provided without being limited to the embodiment.

  The weight 9 has a circumferential recess 9a formed at the front outer periphery, a hole 9b is formed in the axial center from the front end of the weight 9, and a hole 9c communicated from the side surface of the hole 9b to the rear side of the recess 9a. Is formed. For example, a seal ring 10 made of an elastic body such as rubber or an elastic molding resin is mounted in the recess 9a. The seal ring 10 is selected to have good confidentiality and slipperiness. In addition, other lubricants are taken into consideration.

Further, a window portion 1b is formed in the side surface of the substantially rear end of the shaft tube 1, and the tail plug 11 elastically attaches the projecting locking portion 11a formed on the outer peripheral portion thereof to the window portion 1b. It is fixed by engaging.
The fixing means for the tail plug is not limited to the above and can be provided.

(Function)
First, in a state where writing is not performed, the tip ball 3 is brought into close contact with the inner edge of the chip holding portion 2c by the front end of the ink flow rate adjusting body 4 by pressing of the spring 5, so that direct current and backflow of the ink 6 are prevented. Further, the tip ball 3 is always in close contact with the inner edge of the ball holding portion, so that writing wrinkles due to drying of the tip portion are prevented.
Further, since the tip ball 3 is slightly retracted by the writing pressure, a gap is formed and the ink can flow out, and the ink flows out with the rotation of the tip ball 3 by writing.
Further, the follower bar 8 is used when the ink containing portion has a large diameter. That is, there is a problem that the grease-like follower 7 is easily damaged by deformation due to impact or the like when the ink containing portion has a large diameter. It is possible to increase the rigidity by immersing a resin-made follower rod having a specific gravity substantially equal to that of the follower in the follower.

Next, the operation of the pressurizing mechanism will be described below.
The weight 9 can move back and forth between the valve body 12 of the shaft tube and the front end of the tail plug 11 by inertia when the shaft tube 1 is shaken. A gap is appropriately provided between the outer periphery of the weight 9 and the inner periphery of the shaft tube 1, so that the outer periphery of the seal ring 10 and the inner periphery of the shaft tube are slightly in close contact with each other in an airtight manner.
When the weight 9 moves forward to the valve body 12 side, the seal ring 10 is brought closer to the rear end side of the recess 9a due to friction with the inner surface of the shaft cylinder, and the weight 9 is closed with the hole 9c closed by the seal ring 10. The space between the front end of the weight 9 and the rear end of the follower 7 is compressed and pressurized. At that time, the valve portion 12a of the valve body 12 is slightly opened by a predetermined pressure, and pressurized air flows into the rear end of the follower 7 and the front end portion of the weight 9 is substantially applied to the rear end of the valve body 12. Pressurization ends in contact. (Refer to FIG. 3) When the weight 9 moves to the rear end side of the shaft tube 1, the seal ring 10 is brought closer to the front end side of the recess 9a due to friction with the inner surface of the shaft tube. Since the closed state is released and the space between the front end of the weight 9 and the rear end of the valve body 12 is in communication with the outside air, the space between the front end of the weight 9 and the rear end of the follower 7 is decompressed. The weight 9 is retracted without being pushed, the pressure state of the rear end of the follower 7 is maintained with the valve portion 12a closed, and the rear end portion of the weight 9 is in contact with the front end of the tail plug. Retreat ends. (See Figure 4)

  By the pressurizing action, the rear end of the follower 7 is pressurized, and the fluidity of the ink 6 toward the tip side is supported. That is, it prevents the ink from separating from the peripheral surface of the tip ball due to drop impact or poor fluidity of the ink, and prevents the continuous outflow of ink, and recovers when interrupted. Become.

  As described above, when oil-based ink of quick-drying low-viscosity or medium-viscosity gel is used, the oily component of the ink or ink (alcohol) is very small between the tip ball of the chip and the inner surface of the ball holding portion. There is a problem that DC can easily penetrate through the gap. Especially when the tip ball diameter is large, the gap between the peripheral surface of the tip ball and the inner surface of the ball holding part of the chip is large. Therefore, it is important to take measures against direct current due to the close contact between the tip ball and the ball holding portion of the chip and the ink permeability. In the present invention, as described above, by providing the ink flow rate adjusting body 4 having ink repellency in the inner hole of the chip, the ink entering the ink flow rate adjusting body 4 from the ink containing portion is blocked (repelled). In addition, continuous penetration into the minute gap between the tip ball and the inner surface of the ball holding portion is suppressed, and ink is not sucked out from between the tip ball and the inner surface of the ball holding portion of the chip. Is done. In addition, since the tip ball is in close contact with the inner surface of the ball holding portion of the chip, direct current of ink is prevented, and evaporation of ink and drying of the ink on the back of the tip ball are suppressed even if the tip ball is left for a relatively long time. It is possible to write without drowning. In addition, even if the tip ball drops off the tip due to dropping, knocking impact or severe writing, the ink flow control body 4 prevents ink from dropping off due to the ink repellency and other actions. Risks such as leaning and soiling the surroundings are minimized. Whether the ink flow rate adjusting body 4 is provided with ink repellency is selected as necessary.

5 and 6 show another embodiment of the pressurizing mechanism.
The weight 13 is formed with a circumferential recess 13a at the front outer periphery, and a groove 13b is formed at a required position on the front end side of the recess 13a. When the weight 13 advances, the seal ring 10 is moved to the rear end side of the recess 13a. When it approaches, the space between the front end of the weight 13 and the rear end of the valve body 12 can be pressurized (see FIG. 4), and the seal ring 10 approaches the front end side of the recess 13a when the weight 13 is retracted. In this case, the space between the front end of the weight 13 and the rear end of the valve body 12 is communicated with the outside air through the groove 13b, so that the space between the front end of the weight 13 and the rear end of the follower 7 is decompressed. The weight 13 moves backward without any failure.
Further, the pressurizing mechanism is not limited to the one using the inertial force of the weight shown in the embodiment, and may be performed by providing a pumping type pressurizing mechanism configured by a knock mechanism portion and a valve mechanism behind the follower. Is possible.

  In FIG. 7, as described above, the ink flow rate adjusting body 4 is closely mounted in the chip inner hole 2b on the back surface of the tip ball 3 in a substantially abutting state, and the coil is inserted into the chip inner hole 2b from the rear side of the ink flow rate adjusting body 4. A spring 5 is inserted, the front end of the tapered tip 4a of the ink flow rate adjusting body 4 presses the back of the tip ball 3, and the rear end of the shaft 2a behind the tip is properly crimped. The rear end of the shoreline is provided so that it cannot be pulled out. The chip 2 can be formed of a metal or a resin molded product.

FIG. 8 shows another embodiment of the chip.
The tip 14 is formed with a convex portion 14 b projecting inwardly on the peripheral surface of the shaft portion 14 a behind the tip, and the rear end of the winding portion of the spring 5 is brought into contact therewith. Although the convex portion 14b can be provided in a circumferential shape, the convex portion 14b is usually provided at several locations on the peripheral surface so that the rear end of the spring 5 can be easily elastically locked to the convex portion 14b. . The chip 14 can be formed of a metal or a resin molded product.

FIG. 9 shows still another embodiment of the chip.
This chip 15 is provided with a slit portion 15b at a required location on the rear peripheral surface of the shaft portion 15a behind the chip, and a step portion 15c protruding on the inner surface is formed.
The rear end of the winding portion of the spring 5 is brought into contact. Although the convex portion 14b can be provided in a circumferential shape, the convex portion 14b is usually provided at several locations on the peripheral surface so that the rear end of the spring 5 can be easily elastically locked to the convex portion 14b. . The chip 14 is usually formed of a resin molded product.

FIG. 10 shows another embodiment of the present invention. As shown in FIG. 10, the ballpoint pen of the embodiment is provided with a shaft cylinder 16, a tip 18, and ink 6. Other configurations are the same as those of the above-described embodiment.
The shaft cylinder 16 is a resin molded product (usually a transparent resin), and has a tapered tip shaft portion 16a integrally therewith and an ink containing portion filled with ink behind it.
Further, the ink flow rate adjusting body 4 is inserted into the inner hole portion of the tip 18, the coiled spring 5 is disposed at the rear end of the ink flow rate adjusting body 4, and the rear end of the spring 17 extends from the rear end of the tip. It protrudes appropriately and is provided in contact with a convex portion 16c at a required location provided in the hole 16b of the front shaft portion 16a. The convex portion 16c is provided as a circumferential step portion, and the rear end of the spring 17 can be provided in contact with the rear end of the tip 18 at the step portion.

11 and 12 show still another embodiment of the present invention. As shown in the figure, the ballpoint pen of this embodiment is almost the same as the embodiment shown in FIG.
In this case, a coil-like spring 5 is disposed at the rear end of the ink flow rate adjusting body 19 provided in the inner hole portion of the tip 18 with the rod shaft portion 20 penetrating the shaft 18.

It is a longitudinal cross-sectional view which shows the front part of the pressurization type ball-point pen which is embodiment of this invention. It is the elements on larger scale inside a tip end. It is the longitudinal cross-sectional view which shows the rear part of the pressurization type ball-point pen which is embodiment of this invention, and has shown the state which the weight advanced. It is the longitudinal cross-sectional view which shows the rear part of the pressurization type ball-point pen which is embodiment of this invention, and has shown the state which the weight retracted. It is the longitudinal cross-sectional view of the ball-point pen rear part which showed another embodiment of the pressurization mechanism, and has shown the state which the weight advanced. It is the longitudinal cross-sectional view of the ball-point pen rear part which showed another embodiment of the pressurization mechanism, and has shown the state which the weight retracted. It is a longitudinal cross-sectional view which shows embodiment of the chip | tip used for this invention. It is a longitudinal cross-sectional view which shows another embodiment of the chip | tip used for this invention. It is a longitudinal cross-sectional view which shows another embodiment of the chip | tip used for this invention. It is a longitudinal cross-sectional view which shows the front part of the pressurization type ball-point pen which is another embodiment of this invention. It is a longitudinal cross-sectional view which shows the front part of the pressurization type ball-point pen which is another embodiment of this invention. It is the elements on larger scale inside the chip | tip tip of embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Step part 1b Window part 1c Front shaft part 1d Hole part 1e Inner hole 2 Tip 2a Shaft part 2b Tip inner hole 2c Ball holding part 2d Channel part 2e Ball receiving seat 2f Crimp part 3 Tip ball 4 Ink flow rate adjustment Body 4a tip 5 spring 6 ink 7 follower 8 follower rod 9 weight 9a recess 9b hole 9c hole 10 seal ring 11 tail plug 11a locking part 12 valve body 12a valve part 13 weight 13a recess 13b groove 14 tip 14b groove 14 tip 14b Part 15 Tip 15a Shaft part 15b Slit part 15c Step part 16 Shaft cylinder 16a Lead shaft part 16b Hole part 16c Protrusion part 17 Spring 18 Tip 18a Ball holding part 18b Channel part 18c Ball receiving seat 19 Ink flow rate adjuster 20 Rod shaft part

Claims (3)

  In a ballpoint pen that has a tip of a ballpoint pen at the front end and an ink containing portion at the back, and the ink containing portion is provided with a follower that moves as the ink is consumed at the rear end of the ink. An ink flow rate adjusting body that allows ink to pass is inserted, the tapered tip of the ink flow rate adjusting body abuts the back of the tip ball, and a coiled spring is laid at the rear end of the ink flow rate adjusting body A ball-point pen in which the tapered tip is provided so that the tip ball is brought into close contact with the inner edge of the ball holding portion at the tip of the tip by pressing of a spring and the close state is released at the time of writing.   2. The ballpoint pen according to claim 1, wherein an ink flow rate adjusting body having ink repellency and a pressure mechanism are provided behind the follower. The pressurizing mechanism is disposed at a substantially rear end in the shaft cylinder, and is provided at the rear end of the follower in front of the weight and a weight that moves back and forth by the inertia force by swinging the shaft cylinder back and forth. The valve body is opened at a predetermined pressure by the advance operation of the weight, and the air is pushed forward, and the rear end of the follower is pressurized to support the fluidity of the ink to the tip side. The ballpoint pen according to claim 2, wherein the ballpoint pen is provided as described above.

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