TW201420373A - Retractable ballpoint pen - Google Patents

Abstract

An object of the present invention is to provide a retractable ballpoint pen in which a ball is not easy to fall due to impacts of the falling or the knock, thereby enabling stable ink outflow. The present invention provides a retractable ballpoint pen, comprising a friction body being provided in the rear end portion of a barrel, which has a rubber-like elasticity, and can thermal-discolour a trace of a thermal-discolourable ink through frictional heat generated by rubbing on the trace of the thermal-discolourable ink; a coil spring being disposed behind the ball, and pressing the ball onto the inner wall of the front end portion of the ball tip with a pressing force greater than the total weight of the retractable ballpoint pen; wherein a clearance in the longitudinal direction of the ball is 30 to 40 μ m, an outer diameter of caulking portion is 1.0 to 1.2 times of the ball diameter, and the position of centre-of-gravity is in or behind the middle portion of the full-length of a writing instrument when the ballpoint pen tip protrudes.

Description

Infested ball pen

The present invention relates to an accommodating ball pen having a detachment mechanism that allows a tip end portion of a stylus tip to be detached from a front end opening of a barrel.

In the past, there is a haunting type of ball pen, which is a ballpoint pen that holds a ball in such a way that the ball can be rotated freely, and is attached to the front end of the ink containing cylinder directly or via a pen tip holder. The coil spring is configured such that the atomic pen core in which the ink for the ball pen is directly accommodated in the ink accommodating cylinder is pushed into the shaft barrel at the rear end side of the barrel, and the front end portion of the atomic stylus is provided from the shaft barrel. An indifference pen with a haunting mechanism at the front end.

As in the case of the "hot-chromic writing instrument" of Japanese Laid-Open Patent Publication No. 2012-91470, many types of heat-discoloring inks which can be provided by the rear end portion of the shaft barrel have been proposed. The handwriting can be a thermochromic out-of-the-box writing instrument.

In addition, as in the case of the "coating tool" of the Japanese Patent Publication No. 07-204567, a coil spring is provided at the rear of the ball to press the ball toward the inner wall of the tip end portion of the pen tip. To prevent the ink from leaking from the tip of the pen tip.

Furthermore, as described in Japanese Laid-Open Patent Publication No. 06-15218, In the same manner as in the production method, a structure for increasing the gap in the longitudinal direction of the ball for the purpose of increasing the amount of ink consumption has been proposed.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2012-91470

[Patent Document 2] Japanese Laid-Open Patent Publication No. 07-204567

[Patent Document 3] Japanese Patent Publication No. 06-15218

<First Question>

However, as in the case of the aforementioned Patent Document 1, the front and rear writing instrument having the friction body at the rear end portion of the barrel is provided, since the angle of the tangent of the friction body and the operating body is small with respect to the axial center of the barrel, when friction is used In the case of the body, the pen holder and the writing surface are easily abutted, resulting in a limited angle of the use of the friction body, and there is a problem that it is difficult to use the friction body.

The present invention has been made in view of such prior art, providing an easy A thermochromic penetrating pen which has a heat-discoloring desired portion and a friction body at the rear end portion of the barrel.

<Second Question>

However, as in the case of the above-described Patent Document 2, when the coil spring is used in an inhalation type ballpoint pen, a collision may be formed at the tip end portion of the pen tip due to an impact when falling from the table to the ground. When a collision is formed at the tip end portion of the pen tip, even if the ball is pressed against the inner wall of the tip end portion of the pen tip by the coil spring, there is a concern that ink leakage occurs. Further, as in the case of the aforementioned Patent Document 3, the balls are increased for the purpose of increasing the amount of ink supply and the like. In the case of a gap in the longitudinal direction, ink leakage is likely to occur due to a collision. In particular, when the ball diameter is φ 0.4 mm or less, the inner diameter and the outer diameter of the crimping portion of the tip end portion of the nib are both small, and the influence of the same size of the strut on the caulking portion is also increased.

In view of this problem, although it is possible to increase the thickness of the tip end portion of the nib, When the thickness of the tip end portion of the pen tip is increased, a paper sticking phenomenon that abuts against the writing surface is likely to occur at the time of writing, and there is a problem that the writing feeling is lowered.

When verifying that the writing instrument has fallen from the table, there are The hand holding the writing instrument slips and falls, but the reason is that the hand or elbow, the book or the notebook hits the writing instrument placed on the table and drops it.

The present invention has been made in view of such prior art, providing an imperfect factor The impact of the writing instrument placed on the table accidentally dropped, and a collision mark is formed at the tip end portion of the pen tip, and a penetrating pen of a stable ink outflow amount can be obtained.

<First aspect of the present invention>

According to a first aspect of the present invention, in order to solve the above problems, an accommodating ball pen is provided in which a ball pen core is ejected toward a rear end side of a bobbin by a coil spring, and is housed in a bobbin, and is provided by the operation from the foregoing An operation-type portion of the operation body that protrudes outwardly from the outer peripheral surface of the barrel, and the tip of the atomic pen tip is formed by an involuntary mechanism that can be ejected from the front end opening of the barrel, wherein the pen The core is formed by attaching a ball stylus tip which is rotatably held by a ball, directly or via a tip holder to a tip end of the ink accommodating cylinder, and directly accommodating the thermochromic ink in the ink accommodating cylinder. In the pen atom pen: at the rear end portion of the shaft barrel, there is a handwriting for rubbing the thermochromic ink, and the heat of the thermochromic ink is thermally discolored by the friction heat generated thereby. Elastic a body having a maximum outer diameter of the rear end portion of the shaft is 1.0 times to 1.5 times or less of a maximum outer diameter of the friction body, and a maximum width of the operating portion in a circumferential direction is set to be larger than a maximum of the friction body The outer diameter is smaller, and when the friction body faces downward and the axis of the shaft is perpendicular to the writing surface, the angle between the rubbing body and the tangent of the operating portion from the writing surface is 60 degrees or more.

In the first aspect of the present invention, the "first" indicates the tip end of the atomic pen in the longitudinal direction of the writing instrument, and the "back" indicates the side of the friction body.

Further, it is characterized in that the maximum outer diameter of the aforementioned friction body is 1.0 mm to 7.0mm.

Further, it is characterized in that it is from the rear end of the aforementioned friction body to the aforementioned operation portion The distance in the longitudinal direction is twice or more the length of the friction body exposed from the rear end of the barrel toward the outside.

Furthermore, it is characterized by the weight in the state in which the aforementioned atomic pen tip is protruded The heart position is at the middle or rear of the full length of the writing instrument.

The first configuration of the first aspect of the present invention is an ablation atom The pen is attached to the rear end portion of the shaft barrel, and has a handwriting for rubbing the thermochromic ink, and the rubber of the thermochromic ink is thermally discolored by the frictional heat generated thereby. a friction body; the maximum outer diameter of the rear end portion of the barrel is 1.0 to 1.5 times the maximum outer diameter of the friction body, and the maximum width in the circumferential direction of the operation portion is set to be larger than the maximum of the friction body The outer diameter is smaller, and when the friction body faces downward and the axis of the shaft is perpendicular to the writing surface, the angle between the rubbing body and the tangent of the operating portion from the writing surface is 60 degrees or more. Therefore, regardless of whether or not the tip of the atomic pen is present, it is easy to visually recognize the handwriting of the thermochromic ink, and it is possible to achieve an effect of easily causing only a desired portion to be thermally discolored.

This is due to: First, when the maximum outer diameter of the rear end of the aforementioned barrel is super When the friction body is used, there is a concern that the rear end portion of the barrel is shielded from the handwriting when the friction body is used, and the maximum outer diameter of the friction body is larger than the maximum diameter of the rear end portion of the barrel. When the diameter is larger (less than 1.0 times), there is a concern that it is difficult to operate the operating body. Therefore, the maximum outer diameter of the rear end portion of the barrel is set to be 1.0 to 1.5 times the maximum outer diameter of the friction body. When the body is rubbed, the situation in which the handwriting is shielded at the rear end portion of the barrel can be suppressed, and the visibility of the handwriting can be improved. Further, not only the rear end portion of the barrel, but also preferably 1/3 or more of the total length of the writing instrument from the rear end of the barrel where the friction body is located, more preferably 1/2 or more, and most preferably the maximum outer diameter of the entire writing instrument. It is set to 1.0 to 1.5 times the maximum outer diameter of the above-mentioned friction body, whereby the visibility of the handwriting can be further improved.

Next, when the aforementioned friction body faces downward and the axis of the aforementioned shaft is opposite When the writing surface is vertical, if the angle between the rubbing body and the tangent of the operating portion from the writing surface is 45 degrees or more, the user does not have to pay attention to the operating body when holding the writing instrument when using the friction body. The angle of use of the friction body itself (the angle of the writing instrument), in particular, does not require attention to the contact between the writing surface and the operating portion. However, in order to easily thermally change the desired portion only, when the friction body faces downward and the axis of the barrel is perpendicular to the writing surface, the tangent of the friction body and the operation portion is set to 60 degrees or more, preferably. When the thickness is 70 degrees or more, the visibility of the handwriting when using the friction body can be further improved, which is preferable. When the axis of the barrel is perpendicular to the writing surface, the tangent of the friction body and the operating body can be made 90 degrees or more. However, in view of the operability of the operating body, it is preferably 80 degrees or less. Further, when a ball having a ball diameter of less than φ 0.5 mm is used, the handwriting tends to be small, so that the effect of the present invention is more remarkable.

According to the second configuration of the first aspect of the present invention, the aforementioned The maximum outer diameter of the body is set to 1.0 mm to 7.0 mm, and the handwriting of the thermochromic ink can be easily recognized, and the effect of easily causing only a desired portion to be thermally discolored can be achieved. This is because the average notebook is more than 7mm spacing to set the horizontal line, there are also 8mm, 10mm. Therefore, by setting the maximum outer diameter of the friction body to 7.0 mm or less, preferably 6.0 mm or less, when the friction body is used, the visibility of the handwriting written in the horizontal line can be improved, so it is preferable to rub The maximum outer diameter of the body is set to 7.0 mm or less. Further, when the maximum outer diameter of the friction body is less than 1.0 mm, there is a concern that the friction body is broken when the friction body is used. Therefore, it is preferable to set the maximum outer diameter of the friction body to 1.0 mm or more.

According to the third configuration of the first aspect of the present invention, the aforementioned The distance in the longitudinal direction from the rear end of the body to the operation portion is twice or more the length of the friction body exposed from the rear end of the barrel toward the outside, and the handwriting can be reduced without the operation portion. The visibility is easy to recognize the effect of thermochromic ink handwriting. However, when the distance from the rear end of the friction body to the operation portion is too long, it is difficult to operate the operation body. Therefore, it is preferable that the friction body is three times longer than the length in the longitudinal direction of the outer end of the barrel. the following.

According to the fourth configuration of the first aspect of the present invention, The position of the center of gravity in the state where the tip of the atom pen is protruding is located at the middle or the rear of the full length of the writing instrument. Even if the writing instrument placed on the table is accidentally dropped, it is difficult to fall from the front end side of the pen tip to the ground, so that the tip end of the pen tip can be suppressed. Department of injury. In particular, the bumps of the same size tend to have a smaller inner diameter of the caulking portion due to the smaller balls, so that the impact of the impact on the inner diameter such as φ 0.5 mm or less is large, so the effect of the present configuration is more complicated. Significant. Further, the friction body provided at the rear end of the barrel has rubber-like elasticity, and when it collides from the end of the friction body to the ground and collides, the effect of mitigating impact can be achieved, so it is preferably located further rearward than the intermediate portion. In the present invention, the so-called intermediate portion is not limited to writing from The two ends of the full length are equidistant and also include the vicinity.

The friction body used in the first aspect of the present invention has a rubber-like bullet Examples of the member of the properties include polyoxyalkylene rubber, fluorine rubber, chloroprene rubber, nitrile rubber, polyester rubber, ethylene propylene diene rubber (EPDM), styrene elastomer, and ester elastomer. A rubber having an rubbery elasticity such as an olefin-based elastomer, an elastomer, or the like can be appropriately selected and used. Further, the friction body may be integrally formed with the rear end portion of the barrel, or other members may be attached by fitting or the like. Further, it is preferably 40 or more Shore A hardness of 40 or less.

The thermochromic ink used in the first aspect of the present invention is preferably Reversible thermochromic ink. The reversible thermochromic ink may be formed singly or in combination of the following various forms, for example, a heating and decolorizing type by heating to remove color from a coloring state; and maintaining a mutually converted coloring state or achromatic color in a specific temperature region. The color memory retention type of the memory of the state; or the heat coloring type which is colored by the coloring state by heating, and is returned to the decolorizing state by cooling from the coloring state.

Further, the color material contained in the reversible thermochromic ink, Preferably, the reversible thermochromic microcapsule pigment containing a reversible thermochromic composition in the microcapsule is used, and the reversible thermochromic composition contains at least a known (A) electron-donating color-developing organic compound. And (b) an electron accepting compound, and (c) three essential components such as a reaction medium which determines the initiation temperature of the color reaction of the two.

<Second aspect of the invention>

According to a second aspect of the present invention, in order to solve the above-mentioned problems, an injecting type ball pen is proposed in which a ball spring is pushed by a coil spring toward a rear end side of a barrel and housed in a shaft barrel, and is provided with an operation setting. In the operating portion of the operating body of the shaft cylinder, The front end portion of the atomic pen tip can be ejected from the front end opening of the barrel. In addition, the atomic pen core is attached to the front end of the ink containing cylinder by directly holding the ballpoint of the ball having a diameter of 0.4 mm or less by the crimping portion of the tip end portion of the pen tip. And the heat-discoloring ink is directly contained in the ink accommodating cylinder, and the crayon pen has a handwriting for rubbing the thermochromic ink at a rear end portion of the shaft cylinder, and The handwriting of the thermochromic ink can be formed into a thermochromic rubber-elastic friction body by the friction heat generated at this time; at the rear of the ball, the total weight of the ball pen is more than the aforementioned a coil spring that presses the ball against the inner wall of the tip end portion of the tip end by a higher pressing force; the gap in the longitudinal direction of the ball is 30 to 40 μm, and the outer diameter of the crimping portion is 1.0 to 1.2 times the diameter of the ball. Further, the position of the center of gravity in the state in which the atomic pen tip is protruded is located at the intermediate portion or the rear of the entire length of the writing instrument.

In the second aspect of the present invention, "first" indicates the side of the atomic pen tip in the longitudinal direction of the writing instrument, and "after" indicates the side of the friction body. Further, the intermediate portion of the entire length of the writing instrument is not limited to a position equidistant from both ends of the entire length of the writing instrument, and includes the vicinity.

In addition, it is characterized in that the total weight of the aforementioned pen-in-the-box pen is composed It is 10g or less.

Further, it is characterized in that the operation portion of the aforementioned operating body is from the aforementioned shaft barrel The outer peripheral surface is protruded outwardly, and the maximum width in the circumferential direction of the operation portion is set to be smaller than the maximum width in the circumferential direction of the friction body, and is used to move the atomic refill toward the rear end side of the barrel. The pressing force of the push coil spring is set to 100 to 200 g.

The first configuration of the second aspect of the present invention is to use φ 0.4 mm. The following ball-type ball pen is attached to the rear end portion of the shaft cylinder and has: a rubber-elastic friction body for rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting of the thermochromic ink by the friction heat generated thereby; disposed at the rear of the ball a coil spring that presses the ball to the inner wall of the tip end portion of the tip end with a pressing force higher than the total weight of the aforementioned ball pen; and the gap of the ball in the longitudinal direction is 30 to 40 μm, and the riveting portion is outside The diameter is set to 1.0 to 1.2 times the ball diameter, and the position of the center of gravity in the state in which the atomic pen tip is protruded is located at the intermediate portion or the rear of the entire length of the writing instrument, whereby the drop impact can be effectively alleviated.

By setting the position of the center of gravity in the state in which the aforementioned tip of the atomic pen is protruded At the middle or rear of the full length of the writing instrument, even if the writing instrument placed on the table is accidentally dropped, it is difficult to fall from the front end side of the pen tip to the ground. Further, the friction body attached to the rear end portion of the barrel has rubber-like elasticity, and when the friction body is dropped to the ground and collides, the effect of mitigating the impact can be achieved, so it is preferably located further rearward than the intermediate portion.

In addition, when using a small diameter ball of 0.4 mm or less, and the foregoing When the gap in the longitudinal direction of the ball is 30 to 50 μm as described above, when the tip end portion of the ball is used or when the friction body is used, the ball is likely to be subjected to an impact and the ball is moved, which may cause air to be swallowed. Therefore, in the present invention, in addition to the above-described configuration, the ball is pressed against the inner wall of the tip end portion of the pen tip at a higher pressing force than the total weight of the pen-type ball pen to suppress the easy movement of the ball, and the aforementioned riveting The outer diameter of the portion is set to 1.0 to 1.2 times, preferably 1.05 to 1.1 times, to prevent the paper-drawing phenomenon or the ball from falling, and is also an important configuration. When the outer diameter of the caulking portion is smaller than 1.0 times the diameter of the ball, the ball holding force tends to be lowered. When the outer diameter is more than 1.2 times, it is difficult to obtain a desired void, and a paper-drawing phenomenon tends to occur.

In addition, even if small diameter balls of φ 0.4mm or less are used, In the case of thermochromic ink, when the ink consumption per 100 m is less than 150 mg, the handwriting is thinner, and the writing feeling is lowered. When the ink is more than 300 mg, the handwriting dryness is lowered, so it is preferably 150 mg to 300 mg. Good handwriting and writing sense. In addition, the ink consumption per 100 m is calculated by a writing test machine under the conditions of a load of 100 g, a writing speed of 4 m/min, a writing angle of 70 degrees, and a temperature of 20 ° C according to JIS S 6054, and calculation of ink per 100 m is calculated. Consumption (average of 10).

In a second aspect of the present invention, the thermochromic ink is preferably Reverse heat discoloration ink. The reversible thermochromic ink may be formed singly or in combination of the following various forms, for example, a heating and decolorizing type by heating to remove color from a coloring state; and maintaining a color conversion state or a state in a specific temperature region. The color memory retention type of the color state memory; or the heat coloring type which is colored by the coloring state by heating, and is returned to the decolorizing state by cooling from the coloring state.

Further, the color material contained in the reversible thermochromic ink, Preferably, the reversible thermochromic microcapsule pigment containing a reversible thermochromic composition in the microcapsules, the reversible thermochromic composition containing at least: (a) electron supply coloring organic The compound, the (B) electron-accepting compound, and (c) three kinds of essential components such as a reaction medium for determining the initiation temperature of the color reaction of the two.

The particle size of the aforementioned microcapsule pigment is preferably 0.1 μm to 30 μm. The size of the particles is only the average size and can be determined by the volumetric basis of centrifugal sedimentation or laser diffraction. Further, the content of the pigment is preferably from 3 to 15% by mass based on the total amount of the ink composition.

The friction body used in the second aspect of the present invention is a member having rubber-like elasticity, and examples thereof include polyoxyalkylene rubber, fluorine rubber, and neoprene rubber. Rubber, nitrile rubber, polyester rubber, ethylene propylene diene rubber (EPDM), styrene elastomer, ester elastomer, olefin elastomer, rubber rubber, elastomer, etc., which can be appropriately selected use. Further, the friction body may be integrally formed with the rear end portion of the barrel, or may be attached to other members by two-color molding or fitting. Further, it is preferable that the Shore A hardness is 40 or more and 100 or less.

According to the second configuration of the second aspect of the present invention, in addition to the position of the center of gravity, by setting the weight of the product to 10 g or less, the drop impact can be further alleviated. The impact caused by falling is such as F=mV/t (impact force is F[N], mass of object is m[kg], deceleration time is t[s], V=√(2gh) (g is gravity Acceleration = 9.8 [m / s ² ], h is the height [m]), and is closely related to the mass of the object (product weight). Especially when small diameter balls of φ 0.4 mm or less are used, the front end of the nib is riveted. The thickness of the pressing portion is thin, and it is easy to cause a collision when falling. Therefore, it is important to suppress the drop impact by making the weight of the product 10 g or less. However, when the weight of the product is too small, the hand or elbow, the book When the notebook or the like hits the detachable writing instrument placed on the table, it is easy to move, and as a result, it is easy to fall, so that the weight of the product is preferably 5 g or more.

According to the third aspect of the second aspect of the present invention, the operation portion of the operation body is protruded outward from the outer circumferential surface of the shaft cylinder, and the maximum width in the circumferential direction of the operation body is set to be larger than the friction body. The maximum width in the circumferential direction is smaller, and when the friction body is used, the effect of easily recognizing the handwriting on the writing surface can be achieved. However, when the width of the operation portion is reduced, it becomes difficult to operate. Therefore, it is preferable to set the pressing force of the coil spring for pushing the atomic core to the rear end side of the barrel to be 100 to 200 g. In this case, when it is less than 100 g, there is a concern that the tip end portion of the pen tip is inadvertently protruded. When it exceeds 200 g, the operability is lowered, and the aforementioned knocking tendency tends to increase. Therefore, the pressing force of the coil spring is set to 100 to 200 g, preferably 120 g to 180 g.

<First effect>

The present invention can provide a thermochromic penetrating pen which is easy to form a thermochromic portion of a desired portion and has a friction body at a rear end portion of the barrel.

<2nd effect>

According to the present invention, it is possible to provide a pendulum ball pen which is less likely to form a collision at the tip end portion of the pen tip due to impact such as dropping, and which can obtain a stable ink outflow amount.

1‧‧‧Infested ball pen

2‧‧‧ front axle

2A‧‧‧ front opening

3‧‧‧Intermediate axis

4‧‧‧ rear axle

4A‧‧‧Sliding hole

5‧‧‧Operating body

5A‧‧‧Operation Department

5B‧‧‧Axis

5C‧‧‧ Hole Department

6‧‧‧Rotating cam

7‧‧‧ Spring bearing members

8‧‧‧ coil spring

9‧‧‧Fixed body

10‧‧‧Ink holding cylinder

11‧‧‧ nib holder

12‧‧‧Aperture tip

13‧‧‧ nib body

13A‧‧‧Riveting Department

14‧‧‧Ball holding room

15‧‧‧ bottom wall

16‧‧‧Ink flow groove

17‧‧‧Ink flow hole

18‧‧‧ Rear hole

19‧‧‧ balls

20‧‧‧ coil spring

21‧‧‧ writing surface

A‧‧‧Maximum outer diameter of the friction body

B‧‧‧Maximum outer diameter of the rear end of the rear axle

C‧‧‧Maximum outer diameter of the rear axle

D‧‧‧Maximum outer diameter of the front and intermediate shafts

E‧‧‧Width of the operation department

G‧‧‧ center of gravity

H‧‧‧Balls

J‧‧‧Axis

K‧‧‧ riveting outer diameter

L‧‧‧ Full length of the tip of the pen tip

M‧‧‧The distance from the front end of the pen tip to the center of gravity

N‧‧‧ Distance from the rear end of the friction body to the center of gravity

Q‧‧‧Distance from the rear end of the friction body to the operating part

R‧‧‧The length of the friction body exposed from the rear end of the rear axle to the outside

S‧‧‧ tangent

‧‧‧‧ rivet angle

‧‧‧‧ Angle of tangent between the friction body and the operating part

Fig. 1 is a longitudinal sectional view showing a pendulum pen of the first embodiment.

Fig. 2 is a view showing a state in which the tip of the atomic pen is protruded in Fig. 1.

Fig. 3 is an enlarged cross-sectional view showing an important part of a part of the atomic nib of Fig. 1 omitted.

Fig. 4 is an external view seen from the upper direction in Fig. 1.

Fig. 5 is an external view showing an example of a state in which the friction body in Fig. 1 is used.

Fig. 6 is an external view showing another example of the state in which the friction body in Fig. 1 is used.

Figs. 1 to 6 show the haunting pen 1 of the first embodiment. The haunting pen 1 is a screw that couples the front axle 2 and the intermediate shaft 3, and the rear axle 4 passes through the rear end portion of the intermediate shaft 3 to obtain the atomic refill contained in the shaft body. The coil spring 8 disposed between the spring receiving member 7 and the rotating cam 6 at the rear end of the front axle 2 is slidably accommodated toward the rear end direction of the rear axle 4 to be accommodated. Further, in the intermediate shaft 3, an infusing mechanism constituted by the rotating cam 6 is built in. Further, although not shown in the drawings, a cam groove is provided on the inner surface of the intermediate shaft 3.

Further, on the outer peripheral surface of the rear axle 4, the length extending in the longitudinal direction The long window hole 4A is provided to communicate with the inside and the outside in the radial direction, and the transparent operation body 5 is disposed so as to protrude outward in the radial direction from the outer circumferential surface of the rear axle 4 via the window hole 4A. The operation body 5 is provided with an operation portion 5A that protrudes outward from the window hole 4A, and a plurality of serrated cam portions are formed at the distal end so that the rotation cam 5 moves forward and guides rotation (not shown in the drawing). The shaft portion 5B.

At the front end of the atomic nib 12 when using the haunting pen 1 In the state in which the front end opening portion 2A of the front axle 2 is not provided, the operation portion 5A of the operating body 5 that protrudes outward from the radially outer circumferential surface of the rear axle 4 is biased against the spring force of the coil spring 8, and along The window hole 4A of the rear axle 4 is provided, and the front end opening 2A of the front axle 2 is slid. In this manner, the shaft portion 5B of the operating body 5 operates the rotary cam 6. Thereby, the tip end portion of the atomic pen tip 12 is maintained in a state of protruding from the front end opening portion 2A of the front shaft 2, and can be written using the haunting pen 1 . The above-described detachment mechanism is a conventionally known detachment mechanism constituted by the rotary cam 6, and the stylus tip 12 can be detached from the distal end opening 2A of the front axle 2. The elastic force of the coil spring 8 which is pushed by the atomic refill to the rear end side of the rear axle 4 is 150 gf as measured by a push-pull force meter, and the ink consumption per 100 m is 180 mg.

The rear end portion of the rear axle 4 is formed by a polyester elastomer The friction body 9 is fitted and fitted. As shown in Fig. 5 and Fig. 6, the friction body 9 abuts on a handwriting written on the horizontal line P on the writing surface 21 of a notebook or the like, and rubs to generate heat. By this heat, the handwriting of the thermochromic ink can be thermally decolored or thermally discolored. In the state in which the atomic nib 12 is immersed in the front shaft 2, the operating body 5 The angle β between the operation portion 5A and the tangent S of the friction body 9 is 78 degrees with respect to the axis J.

As shown in Fig. 2, the full length L of the accommodating pen 1 of the present embodiment is 144.0 cm in a state where the tip end portion of the atomic stylus tip 12 protrudes from the front shaft 2. Further, in a state where the front end portion of the atomic pen tip 12 protrudes from the front shaft 2, the center of gravity G of the accommodating ball pen 1 is located at a distance M from the front end portion of the atom pen tip 12, and a distance N from the rear end of the friction body 9. Where. The distance M of the haunting pen 1 is 71.5 cm, and the distance N is 72.5 mm. In order to confirm the state of falling from the table, a drop test is performed in which the pendent pen 1 is dropped from the height of 1 m in parallel with the ground, and as a result, it is known that it does not fall from the pen tip side, and the riveting portion 13A has no damage.

As shown in Fig. 4, the maximum width (outer diameter) A of the friction body 9 is 6 mm, and the maximum width E in the circumferential direction of the operation portion 5A is 2 mm (A > E). Further, the maximum width (outer diameter) A of the friction body 9 is set to be smaller than the maximum width (outer diameter) B (7 mm) of the rear end portion of the rear shaft 4 (A>B). The total weight of the haunting pen 1 is 9.0 g, the maximum width (outer diameter) D of the front axle is 9.0 mm, the maximum width (outer diameter) of the intermediate shaft is 9.0 mm, and the maximum width (outer diameter) of the rear axle is C. It is 8mm. Further, as shown in Fig. 1, the distance Q from the rear end of the friction body 9 to the operation portion 5A is 2.7 times the length R of the friction body 9 exposed from the rear end of the rear axle 4 to the outside. .

As shown in FIG. 3, the atomic cartridge is configured by attaching the atomic pen tip 12 to the front end portion of the ink containing cylinder 10 via the nib holder 11. The atom pen tip 12 is formed on a nib main body 13 made of a stainless steel wire, and includes a ball holding chamber 14, an ink circulation hole 17 located at the center of the ball holding chamber 14, and an ink circulation groove communicating with the ink circulation hole 17. Slot 16. The ink circulation groove 16 extends radially and becomes a depth that does not reach the rear hole 18. On the bottom wall 15 of the ball holding chamber 14, A ball 19 made of tungsten carbide having a diameter of 0.38 mm was placed. The ball 19 is slidably pressed by the rivet portion 13A at the tip end portion of the pen tip so as to be partially rotatably protruded from the tip end portion of the pen tip.

Atomic pen tip 12, first φ 2.3mm, hardness 230Hv to 280Hv The stainless steel wire is cut to a desired length, and the ball holding chamber 14, the ink circulation groove 16, the ink circulation hole 17, and the rear hole 18 are placed on the stainless steel wire, and the ball 19 is placed on the bottom of the ball holding chamber 14. The wall 15 is then subjected to rear hammer welding to form a sealing surface having substantially the same shape as the ball 19 on the inner wall of the crimping portion 13A at the tip end portion of the pen tip. Further, the coil spring 20 is disposed behind the ball 19, and the ball 19 is pressed against the inner wall sealing surface side of the caulking portion 13A by the pressing force. The pressing force of the coil spring 20 that presses the ball 19 is set to 20 gf.

Further, in a state where the ball 19 is placed on the bottom wall 15, it will The ball protrusion amount H at which the tip end of the pen tip protrudes is set to 30% of the ball diameter, and the staking angle α is set to 110 degrees, and the space in the longitudinal direction of the ball 19 (the left-right direction of the balls 19 in FIG. 3) is 35 μm. The outer diameter K of the crimping portion is set to 1.05 times the diameter of the ball. Further, the coil spring 20 is disposed behind the ball 19, and the ball 19 is pressed against the inner wall sealing surface side of the crimping portion 13A by the pressing force of the coil spring. The pressing force of the coil spring 20 that presses the ball 19 is set to 20 gf.

By setting the pressing force of the coil spring 20 that presses the aforementioned ball 19 When the weight of the entire (product) of the crayon pen 1 is 30 g or more, good writing and impact resistance can be obtained. This is because when the pressing force of the coil spring 20 that presses the ball 19 is smaller than the weight of the product, it is difficult to suppress the movement of the ball due to the impact, and ink leakage is likely to occur. Further, when the pressing force of the coil spring 20 that presses the ball 19 is larger than 30 g, the writing performance and the writing feeling are lowered.

In a state where the aforementioned ball 19 is placed on the aforementioned bottom wall 15, when When the amount of protrusion H of the ball protruding from the tip end of the pen tip is less than 25% of the ball diameter, the tip end of the pen tip easily touches the writing surface such as the writing surface at the time of writing, and the tip end of the pen tip is easily damaged. When it is larger than 40% of the ball diameter, the ball holding force is weakened, and the impact resistance such as dropping is lowered. Further, by forming the caulking angle α to an obtuse angle, the effect of increasing the ball holding force of the caulking portion 13A can be achieved. However, when the staking angle α exceeds 120 degrees, the front end of the pen tip easily touches the writing surface such as the writing surface. Therefore, the crimping angle α is preferably from 90 to 120 degrees.

Further, in the ink containing cylinder 10, the average particle diameter is 0.5 μm. Reversible thermochromic microcapsule pigment, and contains an ink viscosity of 1020 mPa measured at 1 rpm with an EM-type rotational viscometer. s (25 ° C), ink viscosity at 100 rpm is 84mPa. An ink for thermal discoloration aqueous pen for s (25 ° C) and a shear viscosity reduction index of 0.48 (not shown). Further, a grease-like ink follower (not shown) is directly accommodated at the rear end of the ink in the ink containing cylinder 10. The ink viscosity is preferably 40 to 200 mPa measured at 100 rpm with an EM rotary viscometer. s.

In addition, as shown in FIG. 5, the inhalation type ball pen of the present embodiment 1. In a state where the atomic nib 12 is immersed in the front shaft 2, when the friction body 9 faces downward and the axis J of the barrel is perpendicular to the writing surface, the tangential line of the friction body 9 and the operation portion 5A S is formed in a state of 45 degrees or more with respect to the writing surface. According to this configuration, when the user uses the friction body 9, the user can use it without paying attention to the contact between the writing surface and the operation portion 5A. In particular, the handwriting formed by the balls having a diameter of 0.4 mm or less is thin, and therefore, when the friction body 9 faces downward and the axis J of the barrel is perpendicular to the writing surface, the tangent of the friction body 9 and the operating portion 5A S, as opposed to The writing surface is preferably 60 degrees or more, and most preferably 70 degrees or more.

The pressing force of the coil spring that presses the aforementioned balls is not particularly limited. However, by setting it to be larger than the weight of the product and being 30 g or less, good writing and impact resistance can be obtained. This is because when the pressing force of the coil spring 20 that presses the ball 19 is smaller than the weight of the product, it is difficult to suppress the movement of the ball due to the impact, and ink leakage is likely to occur. Further, when the pressing force of the coil spring that presses the ball is larger than 30 g, the writing performance and the writing feeling are lowered.

In the present embodiment, it is simple to use a ball of 0.38 mm, but The ball diameter is not particularly limited. However, as in the embodiment, when a ball having a diameter of 0.4 mm or less is used, and the gap in the longitudinal direction of the ball is 30 to 50 μm, and the ink consumption per 100 m is 150 to 300 mg, a good handwriting can be obtained. The sense of writing is better. This is because when the gap in the longitudinal direction of the balls is less than 30 μm, it is difficult to increase the ink consumption per 100 m to 150 to 300 mg. On the other hand, when the void in the longitudinal direction of the ball exceeds 50 μm, when the ball having a diameter of 0.4 mm or less is used, the thickness of the tip end portion of the tip is reduced, and the ball holding force is lowered. Therefore, the optimum is 30 μm to 50 μm. The ball diameter is preferably φ 0.3 mm to φ 0.4 mm. In addition, the ink consumption per 100 m is written by a writing test machine under the conditions of a load of 100 g, a writing speed of 4 m/min, a writing angle of 70 degrees, and a temperature of 20 ° C according to JIS S 6054, and it can be calculated that every 100 m is calculated. Ink consumption (average of 10).

In addition, the total weight (product weight) of the haunting pen 1 is not particularly limited, but the impact due to dropping, such as by F = mV / t (impact force F [N], the mass of the object is m [ Kg], deceleration time is t[s], V=√(2gh) (g is gravitational acceleration=9.8[m/s ² ], h is height [m]), and the mass of the object (product weight) In particular, when a small diameter ball of φ 0.5 mm or less is used, the thickness of the crimping portion of the tip end portion of the nib is thin, and a collision is likely to occur when falling. Therefore, it is preferable to make the weight of the product 10 g or less. To suppress the impact of the drop. However, when the weight of the product is too small, the penetrating writing instrument placed on the table is easy to move when it is touched by the hand or elbow, book or notebook, and the result becomes easy to fall, so the product The weight is preferably 5 g or more.

In the present embodiment, the operation portion 5A of the protruding portion is used as both When the writing instrument is placed on the table, the rolling protrusion is formed to form a plate having a circular arc shape in a longitudinal section, and a hole portion for adorning the decoration is provided, and the pen holder may be integrally formed or attached.

Further, in the present embodiment, the front axle, the middle axle, and the rear axle are configured The shaft body is formed, but is not limited thereto. Further, the shaft body (front shaft, center shaft, rear shaft) or the operating body is formed of synthetic resin or metal such as polycarbonate, polyethylene, ABS, etc., but preferably at least the operating system is transparent or translucent. Synthetic resin is formed. As shown in Fig. 6, by designing the operating body to be transparent or translucent, when the friction body is used, even if the operation portion 5A enters the field of view, the visibility of the handwriting is not lowered.

Further, as in the present embodiment, by operating the operation unit The width is set to be smaller than the maximum width of the friction body, and when the friction body is used, the effect of easily recognizing the handwriting on the writing surface can be achieved. However, when the width of the operating body is reduced, it becomes difficult to handle. Therefore, it is preferable to set the pressing force of the coil spring for pushing the aforementioned atomic core to the rear end side of the barrel to be 100 to 200 g. This is because when the thickness of the tip end portion is inadvertently protruded when it is less than 100 g, the operability is lowered when it exceeds 200 g. Therefore, the pressing force of the coil spring is set to 100 to 200 g, preferably 120 g to 180 g.

In addition, when the front end of the rear axle has a maximum outer diameter exceeding the aforementioned When the friction body is used, there is a concern that the rear end of the barrel is shielded from the handwriting when the friction body is used, and the maximum outer diameter of the friction body is larger than the maximum outer diameter of the rear end portion of the barrel. When it is large (less than 1.0 times), there is a concern that it is difficult to operate the operating body. Therefore, the maximum outer diameter of the rear end portion of the barrel is set to 1.0 to 1.5 times the maximum outer diameter of the friction body, and the friction body is used. In this case, it is preferable to suppress the situation in which the back end portion of the barrel is shielded from the handwriting and to improve the visibility of the handwriting. Further, not only the rear end portion of the rear axle but also the 1/3 or more, more preferably 1/2 or more of the total length of the writing instrument from the rear end of the barrel of the friction body is provided, and it is preferably the largest outer circumference of the writing instrument. The diameter is set to 1.0 to 1.5 times the maximum outer diameter of the friction body, whereby the visibility of the handwriting can be further improved. In addition, most notebooks are usually provided with horizontal lines at a pitch of 7 mm, and also have 8 mm and 10 mm. Therefore, it is preferable to set the maximum outer diameter of the friction body to 7.0 mm or less.

In addition, in the present embodiment, the simple example is shown to have a spin. The involuntary ballpoint pen is formed by the cam mechanism, but the infesting mechanism is not limited to this. However, it is preferable to use an infesting mechanism constituted by a rotating cam in consideration of operability and the like.

[Industry use possibility]

The vacant pen of the present invention can be widely used in notebooks or notebooks because it is susceptible to thermal discoloration only in a desired portion.

Since the vacant pen of the present invention can be used without being limited to an infesting mechanism, it can be widely used as a haunting pen.

1‧‧‧Infested ball pen

2‧‧‧ front axle

3‧‧‧Intermediate axis

4‧‧‧ rear axle

4A‧‧‧Sliding hole

5‧‧‧Operating body

5A‧‧‧Operation Department

5B‧‧‧Axis

6‧‧‧Rotating cam

7‧‧‧ Spring bearing members

8‧‧‧ coil spring

9‧‧‧Fixed body

10‧‧‧Ink holding cylinder

11‧‧‧ nib holder

12‧‧‧Aperture tip

G‧‧‧ center of gravity

L‧‧‧ Full length of the tip of the pen tip

M‧‧‧The distance from the front end of the pen tip to the center of gravity

N‧‧‧ Distance from the rear end of the friction body to the center of gravity

Claims (3)

An accommodating ball pen is configured to be inserted into a shaft cylinder by a coil spring to push the atomic pen core toward a rear end side of the barrel, and to provide the atomic stylus tip by operating an operation portion provided on the operating body of the shaft barrel The front end portion of the ink cartridge can be attached to the front end of the ink accommodating cylinder by directly or via the nib holder, and the crayon core is mounted in the ink accommodating cylinder. When the thermochromic ink is directly accommodated, the stylus tip is rotatably held by a rivet portion at the tip end portion of the pen tip, and the ball of φ 0.4 mm or less is used in the crayon pen: The rear end portion is provided with a rubber-elastic friction body for rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting of the thermochromic ink by the friction heat generated thereby; a coil spring that presses the ball to the inner wall of the tip end portion of the tip end with a higher pressing force than the total weight of the aforementioned ball-type pen; and the longitudinal direction of the ball To 30 of 40 m, the outer diameter of the swaged portion is 1.0 to 1.2 times the diameter of the ball, and the position of the center of gravity at the protruding tip of atoms located in the writing state with the intermediate portion or the entire length of the rear side. The genus pen atom pen according to the first aspect of the invention, wherein the total weight of the aforementioned pen-type ball pen is 10 g or less. The accommodating ball pen according to the first or second aspect of the invention, wherein the operation portion of the operation body is attached to protrude outward from an outer circumferential surface of the shaft cylinder, and the circumferential direction of the operation body is The maximum width is set to be smaller than the maximum width in the circumferential direction of the friction body, and the pressing force of the coil spring for ejecting the aforementioned atomic cartridge toward the rear end side of the barrel is set to 100 to 200 g.