JPS58176015A - Production of ultrafine metallic pen point - Google Patents

Abstract

PURPOSE:To obtain a pen point which is finer and stronger than a plastic pen, has higher resistance to abrasion and is vulnerable to capillarity by charging molten metal in a die, cooling the same to solidify near the opening of the die, and pulling downward, drawing and cutting the same. CONSTITUTION:A die body 1 has a passage 2 for molten metal and a screw 3 for stopping a mandrel 7. A temp. sensor 5 is connected to a temp. controller and the current of a heater 4 is turned on and off by the controller to control the temp. in the lower part of the body 1 slightly higher than the m.p. automatically. Cooling water is kept flowed at all times to the passage 9 of a cooling pipe 8 connected to the body 1 through a heat insulating material 6 from a water port 10 while the temp. and flow rate thereof are maintained constant. If the molten metal is charged into the body 1 from above, the molten metal assumes the state of a molten part 12, slag 13, a solidification boundary plane 14 and a solidified part 15. When a receiving tray 11 is pulled downward at a specified speed, the plane 14 stabilizes in a slightly low position. The irregularly shaped metallic pipe obtained in such a way has an inside wall conforming to the sectional shape of a mandrel 7. Such pipe is hot or cold drawn to form a blank material for the pen point. The blank material is rounded 18 at the drawing end and is finished with a circular cone 19 at the ink supply end after cutting, whereby the pen point is obtained.

Description

[Detailed Description of the Invention] The present invention was made to make the pen nib thinner, stronger, and more resistant to wear than the plastic nib that has become popular in recent years, as well as to increase the surface free energy and make it easier to cause capillary action. It is something.

Conventional metal pen nibs include split pens such as fountain pens and needle pens made of a simple circular tube, but the pen tip alone is not structured to sufficiently cause capillary action. In the present invention, a complicated ink flow path is formed in the inner part (1) of the metal circular tube, giving the ink a function of directly sucking up and retaining ink from an ink-impregnated body or an ink storage chamber.

To explain the embodiment with a diagram, (1) in the diagram is the die body, which has a molten metal passage (2) and a mandrill set screw (3), a heater (4) wrapped around the outside, and a temperature sensor at the bottom. (5) Attach. (6) is a heat insulating material,
(7) is a mandrill. (8) is a cooling pipe, which has a cooling water passage (9) and communicates with a water port (10).

Connect the temperature sensor (5) to the temperature controller and turn on the heater (
The temperature of the lower part of the die body (1) is automatically adjusted to be slightly higher than the melting point by intermittent current flow in step 4). Also, keep the temperature of the cooling water constant and always let it flow at a constant flow rate.

Place the receiving bowl (11) at the opening of the die, pour the molten metal from above the die, and after a few minutes, the molten part (12) will appear as shown in the figure.
, slag (13), solidified interface (14), solidified part (1
5). When the receiving rack (11) is lowered at a constant speed, the solidified interface stabilizes at a slightly lowered position.

The metal deformed pipe thus obtained has an inner wall with a cross-sectional shape of a mandrill, and can be hot or cold stretched to form a nib material. Note that (16) and (17) are air holes, but they are not necessary if a long irregularly shaped pipe is not made.

The pen nib material obtained through the above process is cut to any length, with a rounded end (18) at the writing end and a cone (18) at the ink supply end.
9) is finished by cutting or grinding to form a pen tip. The cross-sectional shape is the same over the entire length of the pen tip, and as shown in FIG. 5, is similar to the mandrill shape (FIG. 3).

To explain an example of a writing instrument using this pen nib,
In FIG. 6, (20) is an ultrafine metal nib according to the present invention, (21) is an ink storage body, and (22) is an air hole (23).
), and (24) is a tail pen, indicating the station area used for the marking pen. Ink absorber (2
The ink stored in 1) is transferred to the ink supply end cone (19
), it is absorbed by capillary action and always remains inside the pen tip.
- When the ink is filled and the rounded writing end (18) touches the paper surface, the ink is absorbed by the paper surface and written.

The metal used in this example is so-called Britannia metal (10% lead, 90% tin), but most metals can be used if the material of the die is considered.

In conventional plastic pens, the surface free energy is around 40 dyn/cm, so if the ink passage is not around 30 A, if the pen tip is stored upwards, the ink will be absorbed into the occlusion body, making it impossible to write. In the case of metal, the surface free energy is 200 dynAm or more, so it is possible to take the inside of the ink passage around 1007 dynAm. Therefore, the writing flow rate can be increased without the need for a complicated ink passage like with a plastic nib, so a nib with a drawing line width of Q or Imm can be easily created, the writing pressure strength is also increased, and the surface tension of the ink can be freely selected. There are effects such as being able to.

[Brief explanation of drawings]

The drawings show an actual flow example of the present invention.
The figure shows a top view of an empty die, Fig. 3 shows the mandrill and the opening seen from below, Figs. 4 and 5 show the finished pen nib, and Fig. 6 shows a longitudinal section of the assembled writing instrument. 1 in the figure Die body 2 Molten metal passage 3 Mandrill set screw 4 Heater 5 Temperature sensor 6 Heat insulator 7 Mandrill 8 Cooling pipe 9 Cooling water passage 10 Water 11 Receiving basin 12 Melting part 3 Slag 14 Solid interface 15 Solidification part 16.17 Air hole 18 Roundness 19 Cone 20 M fine metal nib 21 Ink storage body 22 Container seal Air hole 24 Tail Sen Patent Applicant Thibaud Co., Ltd. Representative Toshio Tashima Co., Ltd. Representative Toplan Kogyo Co., Ltd. Representative Toshiyuki Otsuka 21st threshold 13, Figure 3 Figure 4 ″'19 Figure 5 Figure 6

Claims (1)

[Claims] A convex force method for producing ultra-fine pen nibs, which is characterized by injecting molten metal into a die, cooling and solidifying it near the opening of the die, pulling it downward, stretching it, and cutting it.