JP2587444Y2 - Ball pen tip - Google Patents

Description

[Detailed description of the invention]

[0001]

An ink passage comprising a central hole and a plurality of grooves communicating therewith, and a ball holding chamber having an opening at a front end thereof and continuous with the ink passage. The ball holding chamber relates to a ball pen tip having a metal ball as a writing member which partially protrudes from the opening and whose tip has a diameter smaller than the maximum diameter of the ball.

[0002]

2. Description of the Related Art The amount of ink to be applied to the handwriting of a ball pen depends on the size of the gap between the opening of the ball pen tip and the ball. It is known that a large gap is set to discharge a large amount of ink. It is also known that a gap between the inner wall of the ball holding chamber and the ball is made large so that a large amount of ink can communicate therewith.

Further, the gap between the opening of the ball pen tip and the ball is largely opened during writing and is closed in a liquid-tight manner during non-writing, so that it is separated from the ball holding chamber of the ball pen tip. There is also known a method in which a ball is elastically urged forward to open the gap between the opening and the ball during writing by contacting the ball with the paper surface. .

[0004]

The larger the gap between the ball pen tip opening and the ball and the gap between the inner wall of the ball holding chamber and the ball, the easier it is to eject a large amount of ink. Not only is it easy for ink leakage to occur during non-writing,
There is a problem that the inside of the pen tip easily communicates with the outside air, the ink in the ball holding chamber is dried, and writing after writing for a while after standing still tends to cause blurring of the handwriting.

[0005] Such a problem is particularly remarkable in a ballpoint pen using a high-viscosity and quick-drying ink such as a correction liquid using titanium oxide or the like as a coloring material. For example, in the case where handwriting requires high concealment such as correction fluid, it is required to discharge a large amount of ink. In such a case,
In particular, liquid tightness is required in the gap between the ball pen tip and the opening of the ball pen tip, and it is preferable to use the above-mentioned one in which the ball is elastically biased toward the tip of the ball pen tip. However, in order to discharge a larger amount of ink, the gap between the inner wall of the ball holding chamber and the ball must be increased, which causes another problem. .

That is, the tip of the ball-point pen tip is
Caulking inside to hold the
In order to increase the gap between the inner wall of the ball holding chamber and the ball, it is necessary to caulk at a high diameter reduction rate, and the inner surface of the ball holding chamber corresponding to the caulked portion is made of material. Irregularities may occur due to deformation. Even if the unevenness is fine and the ball is elastically urged toward the tip of the ball pen tip, the unevenness affects the liquid tightness at the contact portion, and Once the holding chamber is in communication with the outside air, the ink dries in that area, and the dried ink solidifies in the gap between the ball and the opening of the ball pen tip, causing ink leakage and handwriting. However, there is a problem that blurring is easily generated.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an ink passage having a center hole and a plurality of grooves communicating therewith, and a ball holding chamber having an opening at a front end thereof and continuous with the ink passage. In the ball holding chamber, a metal ball as a writing member is partially protruded from the opening, and the tip portion has a diameter smaller than the maximum diameter of the ball. In the ball pen tip, the tip portion is bent so that the tip end of the ball pen tip is located in the ball holding chamber, and has an outer surface of the tip portion before bending as a contact portion capable of contacting the ball. The gist of the present invention is a ballpoint tip.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a main part of a ball-point tip A according to the present invention.
01 and a plurality of grooves 102 radially formed in communication with the ink passage 1. The ink passage 1 is provided with a ball 3 as a writing member partially protruding from an opening 201 of the tip 2. And a ball holding chamber 4 for holding the ball. Bo
The ball holding chamber 4 is formed with a ball receiving seat portion 401 as a tapered portion which comes into contact with the ball 3 substantially in line contact. Such a ball receiving seat portion 401 that linearly contacts the ball is preferable because the rotation of the ball 3 can be made smooth with respect to ink having a low viscosity.

The tip 2 is bent toward the inside of the ball holding chamber 4 so that the tip 202 of the ball pen tip A is located substantially inside the ball holding chamber 4. . Such processing can be performed by a processing method called so-called curling processing. First, the inner and outer outlines of the ball-point pen tip A are formed by cutting, pressing, or the like, and the distal end portion is formed as a thin portion 203 as shown in FIG. Next, as shown in FIG. 3, a jig is applied to the inside of the thin portion 203, and a rotating roll is pressed against the outer surface 204 to make the outer surface 204 a smooth surface such as a mirror surface. Next, as shown in FIG.
A curling roller having a taper portion 501 and a curved surface portion 502 at the tip end portion 202 of the ball-point tip A, which is also the tip end of the ball-tip.
The tip 5 is pressed to position the tip 202 inside the ball holding chamber 4.

Here, when the ball 3 is installed, if the minimum diameter of the inscribed circle formed by the deformed tip 2 is smaller than the maximum diameter of the ball 3, the ball 3 When the ball 3 is pressed into the ball holding chamber 4, the ball 3 is held. In the example shown in FIG. 1, after the ball 3 is installed in the ball holding chamber 4, caulking is performed to surely prevent the ball 3 from falling off and to make contact with the ball 3. Contact part 204 with ball 3
, A curved surface having substantially the same curvature as that of the ball 3 is formed in the contact portion 204, and the opening portion 201 and the ball are formed.
In this state, further liquid tightness is imparted in a contact state with the nozzle 3. Further, in this embodiment, the rod 3 which is a separate member urged forward is penetrated through the center hole 101 to press the ball 3 toward the opening 201, and the ball 3 is moved in this direction. To make contact with the contact portion 204 of the tip portion 2. As a result, the gap between the opening 201 of the ball pen tip A and the ball 3 is largely opened during writing and closed liquid-tight during non-writing.

Here, the tip portion 20 of the ball pen tip A
2 is positioned substantially inside the ball holding chamber 4, so that a space 403 is formed inside the bent portion. This space 403 also functions as a portion through which ink in the ball holding chamber 4 passes, so that the capacity of the ball holding chamber 4 can be increased. Furthermore, since irregularities on the material surface due to large processing deformation occur on the inner side surface 404 of this space, contact between the opening 201 of the ball pen tip A and the ball 3 can be expected to have high liquid tightness. . still,
Even if irregularities are formed in the contact portion between the opening 201 and the ball 3 before the curling process, this portion is positioned as the outer surface when the ball pen tip A is processed. Therefore, it is possible to easily perform processing such as polishing to make the surface smooth. Furthermore, ball pen tip A
If the tip portion 202 is bent so as to be located substantially inside the ball holding chamber 4, a portion having a certain degree of elasticity provided by devising a material, a thickness, etc., may have an opening. Even if there is a variation in the shape of 201 or the shape of the ball 3, the variation can be elastically absorbed, and poor liquid tightness in contact between the two can be suppressed as much as possible.

FIG. 5 shows another embodiment of the present invention. Parts corresponding to those in FIG. 1 are denoted by the same reference numerals. The basic difference from the one shown in FIG. 1 is the shape of the tip 2. While the one shown in FIG. 1 has a curved surface formed to be rolled up by the above-mentioned curling process, the one shown in FIG.
03, the outer corner of the tip 202 of the tip 2 is chamfered, for example, by grinding to form a smooth curved surface,
The tip 2 is folded inward such that the curved portion becomes the contact portion 204 with the ball 3. Something like this
It can be created without performing the curling process. Further, in this example, assuming a viscous ink having a relatively high viscosity, the ball receiving portion 401 has a curved surface having substantially the same curvature as that of the ball 3. This is because inks having a certain degree of viscosity are used for ball and ball printing.
It often acts as a lubricant between the ball 3 and the ball pen tip, and the ball 3 and the ball receiving seat 401 are brought into substantially planar contact with each other as in the present embodiment, so that the ball 3 and the ball An ink film is formed between the ball 3 and the seat 401 to take advantage of the smooth rotation of the ball 3.

Other than the above, various modifications can be made without departing from the gist of the present invention. For example, the material of the ballpoint pen tip can be exemplified by stainless steel, brass, nickel silver or aluminum alloy. Similarly, examples of the material of the ball 3 include a cemented carbide material. In the above example, the ball 3 is urged forward by the rod 6, but the ball 3 may not be positively pressed against the opening 201. In this case, the type of ink, the ball 3 and the opening 2
It is necessary to take into account the relationship with the gap between the "01" and "01". Further, the ink used for the ball-point tip A of the present invention may be any ink having no reactivity with the metal material, and can be used without limitation such as water-based or oil-based.

[0014]

The ball pen tip of the present invention has an ink passage having a center hole and a plurality of grooves communicating therewith, and a ball having an opening at the front end and continuous with the ink passage.
The ball holding chamber has a metal ball as a writing member that partially protrudes from the opening, and the tip has a diameter greater than the maximum diameter of the ball. In a ball pen tip having a small diameter, the tip is bent so that the tip of the ball pen tip is located in the ball holding chamber, and the outer surface of the tip before bending is in contact with the ball. Because it has as a part, even if you eject a large amount of ink,
This is to minimize the occurrence of ink leakage and the occurrence of handwriting blur.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment.

FIG. 2 is an essential part cross sectional view for explaining the manufacturing method.

FIG. 3 is an essential part cross sectional view for explaining the manufacturing method;

FIG. 4 is an essential part cross sectional view for explaining the manufacturing method.

FIG. 5 is a sectional view of a main part showing the embodiment.

[Explanation of symbols]

 A Ball pen tip 1 Ink passage 101 Center hole 102 Groove 2 Tip 201 Opening 202 Tip 203 Thin part 204 Outer side 3 Ball 4 Ball holding chamber 401 Ball receiving seat 403 Space 404 Inner side 5 Curling roll 501 Taper part 502 Curved surface part 6 Rod

Claims (1)

(57) [Scope of request for utility model registration] 1. An ink passage comprising a center hole and a plurality of grooves communicating therewith, and a ball holding chamber having an opening at a front end thereof and continuous with the ink passage. The ball holding chamber includes a ball pen tip as a writing member, wherein a ball made of metal is partially projected from the opening and the tip is smaller than the maximum diameter of the ball. A ball pen tip, which is bent so that the tip of the ball pen tip is located in the ball holding chamber, and which has a front outer surface before the bending as a contact portion capable of contacting the ball.