JPS6213094B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of manufacturing a ball seat member for a ballpoint pen. Conventionally, ball seats for ballpoint pens have been required to have high wear resistance and lubricity, and to ensure uniform and smooth supply of ink. Various attempts have been made, such as making it possible to supply the ink drawn out from the outlet hole to the ball seating surface, or making it possible to obtain wear resistance and lubricity by combining porous synthetic resin and metal. It's here. However, when attempting to expand the supporting area of the ball to improve wear resistance, the ink supply was limited to a portion of the receiving surface, causing problems such as the ink supply running out during use. . There have also been attempts to extract ink by bundling multiple tubes that open over a wide area of the receiving surface, but in this case, the inner diameter of the tubes is limited to 0.1 mm. Therefore, there were problems in that the numerical aperture could not be large, and the sufficient effect could not be achieved, and the price had to be high. Therefore, the writing distance of conventional ballpoint pens was only about 2,000 meters, and they were still considered consumables. An object of the present invention is to improve the above-mentioned conventional drawbacks, and to provide a ball-receiving member for a ballpoint pen at a low cost, which has extremely good wear resistance and durability, provides smooth ink supply, and does not cause ink to run out. It is something. Therefore, in the method of the present invention, as shown in FIG. For example, as shown in FIGS. 2 and 3, insert it into the hollow tube 4,
The secondary wire bundle is heated at a moderate temperature higher than the melting point of the core wire material and lower than the melting point of the winding material, and the core wire material is eluted as shown at 5 in FIGS. 4 and 5, and a large number of A columnar member in which through-holes 6 are uniformly distributed is manufactured, and at this time, in addition to the plurality of secondary wires, a wear-resistant or lubricating wire 7 is added to the sixth
As shown in the figure, they can be arranged side by side and tied together, and the columnar members 9 of an appropriate length obtained in this way can be used as an ink outlet part, and a ball can be attached to the tip part as shown in FIG. A receiving surface 10 is formed. As the core wire, a low melting point metal brazing material such as gold solder or silver solder is used, and as the winding material, stainless steel, nichrome, tantalum, titanium, tungsten wire, etc. are used. Further, the core wire may be constructed by integrating a low melting point metal wire that can be eluted by heating and a high melting point wire that cannot be eluted, and the high melting point wire can be left in the opening created by heating. The diameter of the formed through hole is approximately equal to the outer diameter of the core wire before heating. It is also possible to perform diameter reduction processing such as swaging or drawing after binding the secondary wires. The ball catch member of the present invention has a through hole diameter that takes into account ink supply and opening distribution.
0.01-0.1 mm is preferable. Further, the number of openings in the seating surface can be arbitrarily set depending on the opening diameter and the outer diameter of the member, but in general, about 3 to 10 openings is optimal for supplying ink to the entire seating surface. When bundling a large number of secondary wire rods together, wire rods with excellent wear resistance or good lubricity, such as wire rods made of boron nitride, silicon carbide, graphite, etc., are arranged in parallel and formed integrally to create a catch. Durability and lubricity can be improved by disposing a wear-resistant and lubrication-resistant composition within the metal surface of the surface base. The seat member according to the present invention is inserted into another hollow outer tube and fixed in place by press-fitting, caulking, or using an adhesive, or it can be bundled within the hollow tube 4 as shown in FIG. The secondary wire rod 8 is inserted into the outer tube 8, and the 2 wire rod inserted into the outer tube is simultaneously opened by heating.
The ball gripping body 13 is formed by integrating the gaps between the wires by infiltrating the wire with a brazing material. In addition, as shown in FIG. 9, the bundled wire rods are tightly inserted into the hollow tube body 4 in advance, and the hollow tube body 4 is integrated by heating, and the tube body portion is attached to the end surface of the bundled wire rod. It is also possible to make the ball 12 protrude from the tube member protruding portion 11 and wrap the ball 12 in the tubular protruding portion 11, which further improves the cost. Next, examples of the present invention will be described below. Example 1 A silver brazing wire with an outer diameter of 0.06 mm is used as the core wire, and an outer diameter of 0.05 mm.
SuS316 stainless steel wire is tightly wound around it as a secondary wire, and the inner diameter is 0.8 mm and the wall thickness is 0.05 mm.
After inserting 10 of the secondary wires into a stainless steel thin tube, the outside diameter of the pipe is reduced to 0.6 mm by drawing. Next, this was cut to a length of 13 mm, and one end was pressed with a jig with a hemispherical surface to form a concave surface.Then, it was heated to 1150 °C in a hydrogen atmosphere and held for 1 hour to elute the core wire. , infiltrated into the winding gap. As a result, a ruby ball with an outer diameter of 0.5 mm is placed on the spherical part of the obtained columnar body, the other end of the columnar body is connected to the ink storage body, and a ballpoint pen is constructed by combining with a ball holder etc. I made it possible. Example 2 A silver braze wire with an outer diameter of 0.07 mm is used as a core wire, and titanium wires and molybdenum wires with an outer diameter of 0.05 mm are alternately wound around the core wire to form a secondary wire and a titanium thin tube with an inner diameter of 0.8 mm and a wall thickness of 0.07 mm. The outer diameter of these seven secondary wires and the space between them is
Insert a 0.05mm SiC wire and then draw the outer diameter of this thin tube to 0.7mm.
After reducing the diameter to 14 mm and cutting it to a length of 14 mm, one end of the tube was cut to a depth of 0.25 mm using a drill with an outer diameter of 0.55 mm, leaving the outer tube portion, and at the same time, the end surface was processed into a spherical surface. Then,
This was heated to 1150° C. in vacuum and held for 1 hour to elute the core wire and infiltrate into the winding portion to create a columnar body. A ruby ball with an outer diameter of 0.5 mm was placed on the spherical surface of one end of this columnar body, and the ball was held down by the tip of the protruding tubular body to create a ballpoint pen tip. Example 3 A ballpoint pen was constructed using the ball seat members prepared in Examples 1 and 2, and a writing test was conducted in comparison with a commercially available ballpoint pen. The writing speed in this comparison test was 10cm/S, the paper was NS60,
The inclination angle of the pen core was 75 degrees, the load was 50 g, and water-based ink was used. The test results are shown in Table 1.

【table】

[Table] * The amount of wear on the catch is expressed as the amount of ball sinking.
** Sagging occurred on the seat surface.
As shown in Table 1, the writing distance of the ballpoint pen using the ball seat member manufactured according to the present invention is significantly superior, and therefore the amount of wear on the seat is small, and the ball wears out due to good lubricity. The quantity is also decreasing. When assembling a ballpoint pen using the catch member of the present invention, in addition to drawing out ink through the through hole of the catch member, ink can also be supplied through the outer periphery of the catch member to ensure even smoother ink supply. . In addition, in the above embodiment, the end surface that becomes the seat surface is pressed using a jig and formed into a spherical shape before heating the material, but after this spherical processing is performed and the columnar body is created after heating, There is no problem in processing the opening without significantly damaging it. Further, it is possible to arbitrarily select, depending on the structure of the chip, that the spherical portion be a part of the columnar body rather than the entire surface thereof, or that the ball be supported by the flat end portion. As mentioned above, the ball seat member for a ballpoint pen according to the present invention can significantly improve durability compared to conventional products, and ballpoint pens using this seat member have a long lifespan due to their conventional nature of being consumables. It can be used for any purpose. Further, by using the ball seat member according to the present invention, the internal structure of the ballpoint pen can be simplified, and effects such as making it possible to manufacture the ballpoint pen at low cost can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of the secondary wire rod, Fig. 2 is a cross-sectional view showing a state in which a plurality of secondary wire rods are inserted into a hollow tube, and Fig. 3 is an enlarged sectional view taken along the line - in Fig. 2. , FIG. 4 is a cross-sectional view showing the state after the core wire of the secondary wire shown in FIG. 2 has been eluted, and FIG.
6 is a cross-sectional view of a ball seat member according to another embodiment of the present invention, and FIG. 7 is a longitudinal sectional view of a ball seat member manufactured according to the present invention. FIG. 8 is a longitudinal sectional view showing a state in which the ball seat member shown in FIG. 7 is inserted into the outer tube;
FIG. 9 is a longitudinal cross-sectional view showing a ball-holding state of the ball-receiving seat member manufactured according to the present invention, in which the tube member protrusion of the outer tube shown in FIG. 8 is used as a ball-holding portion. 1... Core wire material, 2... Winding wire material, 3... Secondary wire material, 4...
Hollow tube body, 5... Infiltration part, 6... Opening part, 7... Wire rod,
8...Outer pipe, 9...Ball seat member, 10...Ball seat surface, 11...Pipe material protrusion, 12...Ball, 13...
Ball holding body.

Claims (1)

[Claims] 1. When manufacturing a ball seat member for a ballpoint pen having a large number of through holes in the longitudinal direction, a wear-resistant and corrosion-resistant metal wire 2 having a higher melting point than the metal core wire 1 is wound around the metal core wire 1. A plurality of secondary wires 3 are made into a bundle and heated to a temperature at which only the metal core wire can be melted, thereby eluting the core wire and forming a large number of through holes 6 in the length direction. A ball receiving surface 10 is formed and receives a ball for a ballpoint pen at one end.
1. A method of manufacturing a ball seat member for a ballpoint pen, the method comprising: forming a ball seat member for a ballpoint pen. 2. Another wire rod 7 with excellent wear resistance or lubricity is bundled in parallel with the secondary wire rod 3, heated at a temperature that allows only the core material to melt, and eluted to give the bearing surface 10 resistance. The manufacturing method according to claim 1, characterized in that a material having good abrasion properties or excellent lubricity is arranged.