JP2013103468A - Cap type ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap type ballpoint pen that is controlled in abrasion of the bottom wall of the ball holding chamber, and is appropriate for long distance writing with a simple structure.SOLUTION: The cap type ballpoint pen is formed by arranging an ink tank that receives the ball point ink in a shaft tube; placing at a bottom wall of a ball holding chamber, a ball that is made by detachably being equipped with the cap at an end of the shaft tube, making a ballpoint pen tip that is made by rotatably holding a part of the ball that projects from a chip end by caulking the chip end inside, a writing medium; and arranging an elastic body that seals up the chip end at an insertion part provided at the end of the cap body. A lubrication overlayer is provided on the surface of the chip end and/or the ball surface and the caulking angle of the chip end is ≥40° and ≤90°.

Description

  According to the present invention, an ink tank containing ballpoint pen ink is disposed in a shaft cylinder, and a cap is detachably attached to the tip of the shaft cylinder, and the ball is mounted on the bottom wall of the ball holding chamber. The present invention relates to a cap-type ballpoint pen that uses a ballpoint pen tip that is rotatably held by caulking a tip end of the tip inwardly so that a part of the ball protrudes from the tip end edge of the tip.

  Conventionally, an ink tank containing ballpoint pen ink is disposed in the shaft cylinder, and a cap is detachably attached to the tip of the shaft cylinder. The ball is placed on the bottom wall of the ball holding chamber. A cap-type ballpoint pen that uses a ballpoint pen tip formed by caulking the tip end portion inward so that a part of the ball protrudes from the tip end edge and is rotatably held is well known. .

  In such a conventional cap-type ballpoint pen, the ball is rotated in the insertion portion provided at the tip of the cap body as disclosed in Japanese Patent Application Laid-Open No. 9-262532 “Applicator” and Japanese Utility Model Laid-Open No. 6-64961 “Writing tool”. An elastic body that seals the tip of the ballpoint pen tip that is freely held, and the tip of the tip is sealed to prevent ink leakage at the tip of the tip and to prevent ink drying in the tip. Many have been proposed.

JP-A-9-262532 Japanese Utility Model Publication No. 6-64961

  In Patent Documents 1 and 2 described above, in order to seal the tip end of the chip with the elastic body disposed in the cap, the elastic body, the tip end of the chip and the ball need to abut, and the elastic body needs to be elastically deformed to be sealed. There is. However, the ink attached to the tip of the tip and the ball is transferred to the elastic body, and the ink is dried and solidified, so that the tip end of the tip and the ball and the elastic body are adhered, so that the cap attaching / detaching performance is lowered. In severe cases, if the ball holding force at the tip end of the chip is small, the ball may drop off.

  By the way, the ball holding force tends to decrease due to damage to the tip of the tip due to dropping or increased clearance due to wear due to writing. The holding force of the ball held by caulking at the tip of the tip largely depends on the caulking angle, and it is desirable to increase the ball holding force by increasing the caulking angle. However, when the caulking angle is increased, there is a problem in that it is difficult to obtain stable ink consumption because the radial gap between the ball and the ball holding chamber tends to increase at a position corresponding to the caulking portion.

  The present invention has been made in view of these conventional techniques, and it is an object of the present invention to provide a cap-type ballpoint pen capable of obtaining stable writing performance over a long period and a long distance.

  In order to solve the above problem, the present invention provides an ink tank containing ballpoint pen ink in a shaft tube, and a cap is detachably mounted on the tip of the shaft tube. A ballpoint pen tip, which is placed on the bottom wall of the holding chamber and squeezes the tip end of the tip inward so that a part of the ball protrudes from the tip end edge of the tip and is rotatably held as a writing medium, A cap is a cap-type ballpoint pen in which an elastic body that seals the tip end of the tip is disposed in an insertion part provided at the tip of the cap body, and the surface of the tip end and / or the surface of the ball In addition, a lubricating coating layer is provided on the tip, and a caulking angle of the tip end portion of the chip is 40 degrees or more and 90 degrees or less.

  In addition, the ink storage member is disposed between the ballpoint pen tip and the ink tank, and temporarily retains the overflowed ink accompanying an increase in internal pressure in the ink tank, and is provided behind the ink storage member. It is a direct liquid type ballpoint pen in which the ink tank is detachably attached.

  According to the first configuration of the present invention, there is provided a cap-type ballpoint pen in which an elastic body that seals the tip end portion of the chip is provided, and a lubricating coating layer is provided on the surface of the tip end portion and / or the surface of the ball. In addition, by providing the tip end portion with a caulking angle of 40 degrees or more and 90 degrees or less, stable writing performance can be satisfied over a long period and a long distance.

  This is because the caulking angle is 40 degrees or more and 90 degrees or less, preferably 50 degrees to 80 degrees, and more preferably 60 degrees to 70 degrees, so that the gap amount in the radial direction between the ball and the ball holding chamber, This is because a change in the position corresponding to the caulking portion is small, a good writing can be maintained over a long distance, and a stable writing can be obtained over a long period of time.

  In addition, by providing a lubricating coating layer on the surface of the tip of the chip and / or the surface of the ball, resistance can be reduced even if the tip of the chip comes into contact with a writing surface such as a paper surface during writing. It is possible to prevent damage to the tip of the tip and the writing surface, suppress a decrease in the ball holding force, and suppress the writing performance stably over a long period and a long distance by the synergistic effect with the caulking angle described above. .

  Furthermore, when the tip end of the chip is sealed with an elastic body, the ink adhered to the surface of the tip end of the chip and / or the surface of the ball may stick to the elastic body, and the handwriting may be affected when the cap is attached or detached. However, by providing a lubricating coating layer on the surface of the tip of the tip and / or the surface of the ball, it is possible to make it difficult for the tip of the tip and / or the ball and the elastic body to stick to each other.

  The lubricating coating layer used in the present invention includes diamond-like carbon (DLC), tungsten disulfide (WS2), molybdenum disulfide (MoS2), graphite, fluorine-containing polymers such as tetrafluoroethylene (PTFE), silicone, and the like. Conventionally known solid lubricants such as resins can be used as appropriate. The method for coating the lubricating coating layer is not particularly limited, and examples thereof include vacuum deposition, ion deposition, physical vapor deposition, chemical vapor deposition, and vacuum arc deposition. There may be. In particular, among the above-described lubricants, it is most preferable to use diamond-like carbon (DLC) in consideration of wear resistance, lubricity, and difficulty of ink adhesion.

  Further, according to the second configuration of the present invention, the ballpoint pen tip is mounted directly or through a tip holder on an ink tank for directly storing ink, and between the ballpoint pen tip and the ink tank. And an ink reservoir member that temporarily holds overflow ink accompanying an increase in internal pressure in the ink tank, and a direct liquid type in which the ink tank is detachably attached to the rear of the ink reservoir member By using the ball pen, replacement of the ball-point pen tip is unnecessary, and stable writing performance can be maintained over a long period and a long distance.

  The ball material used in the present invention is not particularly limited, such as tungsten carbide super hard material, ceramic material such as zirconia, stainless steel material, etc., and the chip body is also particularly limited to stainless steel, copper alloy, aluminum, etc. It is not a thing.

  The elastic body in the present invention is an elastically deformable natural rubber, silicone rubber, butyl rubber, fluorine rubber, vinyl chloride resin, butadiene rubber, urethane rubber, thermoplastic elastomer, other synthetic rubbers, etc., which are generally known rubber elasticity. What is necessary is just to select suitably according to the material of the tip part of a chip | tip, an ink component, etc. from a body. In addition, the hardness of the elastic body in the present invention is not particularly limited. However, when JIS A is larger than 100, it is difficult to deform, and hermeticity is deteriorated. When JIS A is lower than 30, deformation occurs at the time of installation. Since it is easy to do and it becomes difficult to return to the original, it is preferable to set it to 30 or more and 100 or less by JISA.

  The present invention has provided a cap-type ballpoint pen that can obtain stable writing performance over a long period and a long distance.

1 is a longitudinal sectional view showing a ballpoint pen of Example 1. FIG. It is a figure which shows the state which removed the cap of FIG. FIG. 2 is an enlarged vertical cross-sectional view of a main part, partly omitted, showing the ball-point pen tip of FIG. 1.

Example 1
The cap-type ballpoint pen 1 according to the first embodiment shown in FIGS. 1 to 3 is a comb-like ink that temporarily holds the overflow ink accompanying the increase in the internal pressure of the ink tank 4 between the ballpoint pen tip 2 and the ink tank 4. An ink tank exchange-type direct liquid ballpoint pen in which a reservoir member 3 is disposed and an ink tank 4 is detachably attached to the rear of the ink reservoir member 3.

  The cap-type ballpoint pen 1 includes a front shaft 5 and a rear shaft 6 that is detachably attached to a rear end portion of the front shaft 5. A cap 5 is attached to the front shaft in a detachable manner. The ink storage member 3 is accommodated in the shaft 5, and the ink tank 4 is accommodated in the rear shaft 6. Further, a cylindrical coupling portion 5B projects from the rear end portion of the front shaft 5, and the ink tank 4 is detachably connected to the coupling portion 5B. Further, a ballpoint pen tip 2 serving as a pen tip is attached to the tip of the ink storage member 3. Ballpoint pen ink (not shown) is guided from the ink tank 4 to the ballpoint pen tip 2 by the first and second ink guiding members 7 and 8.

  The front shaft 5 is formed of a cylindrical body having both ends opened, and a male screw portion 5A is formed at the rear end portion of the front shaft 5 in a cylindrical threaded portion with a reduced diameter. The connecting portion 5B is press-fitted into the opening of the ink tank 4 when the ink tank 4 is opened, and the opening of the ink tank 4 is inserted into a part of the rear end of the connecting portion 5B when the ink tank 4 is opened. A projecting piece 5BA is formed that pushes the plug 9 backward.

  The rear shaft 6 is formed of a bottomed cylindrical body having an open front end, and can be detachably screwed onto the inner peripheral surface of the front end opening of the rear shaft 6 with the male screw portion of the screw portion 5A of the front shaft 5. A female screw portion 6A is formed. The rear shaft 6 is formed of a synthetic resin made of polyethylene having transparency so that the remaining amount of ink in the ink tank 4 can be visually recognized from the outside.

  The ink storage member 3 includes a plurality of disc-shaped comb teeth 3A. A retaining groove 3B for temporarily retaining ink is formed between the comb teeth 3A. The comb teeth 3A are formed with slit-like guide grooves 3C extending in the axial direction and connected to the respective retaining grooves 3B. A communication groove 3E that is connected to the guide groove 3C and that opens to the ink tank 4 side is provided in the front-rear direction in the flange portion 3D that is located at the rearmost end of the comb teeth 3A group of the ink storage member 3. Further, the comb teeth 3A are formed with concave grooves 3F for air circulation. Further, a center hole 3G is provided in the center of the ink retaining member 3, and a first ink guide member 7 made of a synthetic resin extruded product is inserted into the center hole 3G. In addition, a second ink guiding member 8 made of a fiber processed body for guiding ink to the rear surface of the ball 10 is accommodated inside the ballpoint pen tip 2.

  The ink tank 4 is a bottomed cylindrical body that is open at the front end and closed at the rear end. A plug body 9 that seals the inside of the ink tank 4 is provided on the inner peripheral surface of the opening. Inside, water-based ballpoint pen ink is stored directly.

  The cap 18 is a bottomed cylindrical body with the rear end of the cap body 19 opened and the tip closed, and a rib 19A protruding inward is provided in the tip, and the tip tip 12 is provided between the ribs. An elastic body 20 that closes the ball 10 is disposed by press-fitting.

  The ball-point pen tip 2 will be described in detail. A stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv is obtained by cutting. This ball-point pen tip 2 has a ball holding chamber 13 of the chip body 11, an ink circulation hole 16, and an ink circulation groove 15 extending radially from the ink circulation hole 16. The ball 10 is rotatably held by placing a 5 mm ball 10 and caulking the tip end portion 12 inward.

  The caulking angle α of the tip end portion 12 is set to 60 degrees in consideration of the paper contact angle and the ink flow path. Further, the angle β of the bottom wall 4 was 110 degrees. If the angle of the bottom wall exceeds 150 degrees, it is difficult to suppress wear in long-distance writing, and if it is less than 90 degrees, the area of the contact surface may become too large. It is preferably 90 ° or more and 150 ° or less, and most preferably 100 ° to 140 °.

  The inner surface and the bottom wall 14 of the tip end portion 12 of the ball-point pen tip 2 are provided with a wear-resistant coating layer 17 made of a surface layer portion of diamond-like carbon (DLC). By providing the wear-resistant coating layer 17 on the inner surface of the tip end portion 12, the wear resistance of the bottom wall 14 of the ball holding chamber 13 and the surface of the ball 10 and the inner surface of the tip end portion 12 and the surface of the ball 10 at the time of writing. The remarkably improved performance can eliminate the need for replacement of the ball-point pen tip, and can satisfy the stable writing performance over a long period of time. Further, since the contact resistance between the bottom wall 14 of the ball holding chamber 13 and the surface of the ball 10 is reduced, the rotation of the ball 10 can be made smooth.

  Furthermore, since the contact resistance is reduced even when the elastic body 20 is in contact with the cap, the resistance can be reduced even when the cap 18 is attached / detached, and repeated attachment / detachment of the cap can be performed stably.

  The ink for ballpoint pens is a commercially available (made by Pilot Corporation) water-based ballpoint pen ink consisting of water, an organic solvent, and a colorant (water-soluble dye), and the ink viscosity in an environment at 20 ° C. was 2 mPa · s. Further, the ink consumption per 100 m was 120 mg from 0 to 100 m, 132 mg from 400 m to 500 m, and 132 mg from 900 m to 1000 m. Furthermore, as a result of continuously exchanging the cartridge and measuring it, 1400 to 1500 m was 135 mg, and 1900 m to 2000 m was 137 mg. The ink consumption was measured with a writing tester (writing speed: 4 m / min, writing load: 100 g, writing angle: 70 degrees) written in a spiral, and the ink consumption was measured at a writing distance of 100 m. It is a numerical value.

  The vertical gap (clearance) between the ball and the tip of the chip was 18 μm unwritten, 22.0 μm after writing 0-100 m, 23 μm after 500 m writing, and 24 μm after 1000 m writing. Furthermore, as a result of continuously measuring after replacing the cartridge, it was 24 μm after 1500 m writing and 25 μm after 2000 m writing.

  In this embodiment, for the sake of convenience, in this embodiment, the wear-resistant coating layer is provided only on the chip body for convenience. However, the abrasion-resistant coating layer may be provided on the surface of the ball and / or the surface of the chip body. Moreover, although the cutting type which forms a ball-point pen tip by cutting a stainless steel wire material with a drill is illustrated, the pipe-type ball-point pen tip which forms a ball-point pen tip by pressing a stainless steel pipe etc. may be used. In addition, for the sake of convenience, the ink circulation groove has a shape that does not penetrate to the rear hole, but is not particularly limited to penetration or non-penetration.

  In addition, the ink for ballpoint pens used in the present invention is not particularly limited, such as ink for oil-based ballpoint pens and ink for water-based ballpoint pens. Since the ball and the chip body tend to be boundary lubricated and are likely to be worn, it is preferable to provide a lubricating coating layer on the inner wall of the ball holding chamber and / or the ball. Further, the ink viscosity of the ink for the ballpoint pen of the present invention is not particularly limited, but when the viscosity at the time of writing is less than 10 mPa · s, the ball and the bottom wall tend to be boundary lubricated and the bottom wall is worn. Therefore, the effect of the present invention is remarkable.

  In this embodiment, the wear-resistant coating layer 17 is provided on the surface and the inner surface of the tip end portion 12 for convenience, but in addition to this, it is provided on both the inner surface of the tip end portion 12 and the surface of the ball 10. A configuration or a configuration provided only on the surface of the ball 10 can be employed.

  The cap-type ballpoint pen of the present invention can be widely used as a ballpoint pen, and can be suitably used particularly as a ballpoint pen using a small diameter ball of 0.5 mm or less.

DESCRIPTION OF SYMBOLS 1 Cap-type ball-point pen 2 Ball-point pen tip 3 Ink storage member 3A Comb tooth 3B Reservation groove 3C Guide groove 3D Gutter part 3E Communication groove 3F Concave groove 3G Center hole 4 Ink tank 5 Lead axis 5A Screw part 5B Coupling part 6 Back axis 6A Screw part 7 First ink guide member 8 Second ink guide member 9 Plug body 10 Ball 12 Chip body 13 Ball holding chamber 14 Bottom wall 14A Abutting surface 15 Ink flow groove 16 Ink flow hole 17 Wear-resistant coating layer 18 Cap 19 Cap body 20 Elastic body α Caulking angle β Bottom wall angle

Claims (2)

An ink tank containing ballpoint pen ink is disposed in the shaft cylinder, and a cap is detachably attached to the tip of the shaft cylinder. The ball is placed on the bottom wall of the ball holding chamber, and the chip A ballpoint pen tip formed by caulking the tip end inwardly so that a part of the ball protrudes from the tip end edge of the tip and is rotatably held is used as a writing medium, and the cap is provided at the tip end of the cap body. A cap-type ballpoint pen provided with an elastic body that seals the tip end of the tip, wherein a lubricating coating layer is provided on the surface of the tip end and / or the surface of the ball, and the tip end of the tip A cap-type ballpoint pen having a caulking angle of not less than 40 degrees and not more than 90 degrees. An ink reservoir member that is disposed between the ballpoint pen tip and the ink tank and temporarily retains the overflowed ink accompanying an increase in internal pressure in the ink tank; and the ink reservoir member is disposed behind the ink reservoir member. 2. The cap-type ballpoint pen according to claim 1, wherein the cap-type ballpoint pen is a direct liquid type ballpoint pen with a tank detachably attached thereto.

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