JP3753390B2 - Ballpoint pen refill with a valve mechanism at the tip - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is to prevent the ink from drying at the tip end of the tip of the ballpoint pen refill that contains the ink for the ballpoint pen in the ink containing cylinder and to prevent the ink from being ejected by caulking the tip end edge of the ball. A movable member having a ball pressing portion that comes into contact with the rear end surface of the ball and a coil spring that comes into contact with the rear end surface are arranged in a ballpoint pen tip that is partly exposed outward from the tip edge and is held freely. The present invention relates to a ballpoint pen refill provided with a valve mechanism at the tip end of the tip, which is used as a valve mechanism by pressing the ball against the inner wall of the tip end crimping portion.
[0002]
[Prior art]
The ink for the ballpoint pen is stored in the ink storage cylinder, a follower is loaded at the rear end of the ink as the ink is consumed, and a tail plug having a ventilation means is fixed at the rear end of the ink storage cylinder. A ballpoint pen refill in which a metal tip for a ballpoint pen is fitted in the front end opening of the storage cylinder is well known as a type of ballpoint pen refill with a large inner diameter of the ink storage cylinder.
[0003]
Also, the ball housed in the ball house is pressed into the metal tip for ballpoint pen, which is partly exposed outward from the tip edge by caulking of the tip edge and is held freely. A ballpoint pen having a structure in which a movable element and a coil spring are arranged and a ball is pressed against the inner wall of the tip caulking portion, for example, as in Japanese Utility Model Publication No. 39-12125, can be felt a difference in its intended purpose. It is to be regarded as a common knowledge technology.
[0004]
Furthermore, in Japanese Utility Model Publication No. 6-86977, gel ink is stored in an ink storage cylinder, a follower that follows the ink consumption is loaded at the rear end of the ink, and a tail having a ventilation means at the rear end of the ink storage cylinder. Attach the stopper and attach the ballpoint pen tip that is held by the tip of the ball and that is directly repelled by the coil spring to the tip end of the ink storage cylinder. A ballpoint pen refill is disclosed.
[0005]
This technique has a conventional ink viscosity at 20 ° C. of 20,000 mPa.s. s or more, and 5 mPa.s for oil-based ballpoint pens with high viscosity ink. Focusing on the advantage that a low-viscosity water-based ballpoint pen with a viscosity of s or less can be written smoothly with a light touch, water-based ink is applied to an ink occlusion body coated with a cotton-like plastic fiber with a film. Product lineup of ballpoint pens such as pendant ballpoint pens that have been occluded, pen-type direct-filling ballpoint pens that have a pen-core mechanism with comb grooves that store water-based ink directly in the ink storage cylinder, and have an ink discharge adjustment function. In order to solve the problems of ballpoint pens with high-viscosity ink or ballpoint pens with low-viscosity ink, and to adopt water-based gel ink and medium-viscosity oil-based ink having shear thinning viscosity, It has been attracting attention.
[0006]
[Problems to be solved by the invention]
When using a water-based gel ink or medium-viscosity oil-based ink with shear thinning viscosity, the ball-point pen of high-viscosity oil-based ink has high writing pressure, and there are problems such as crying, blistering, and blurring of the handwriting. It is intended to solve the problem of high consumption, high ink cost, due to performance problems such as handwriting smearing and back lining, large ink storage cylinders, and a large number of parts. The ballpoint pen refill using the high viscosity oil-based ink has the maximum advantage that can be used for the knock type ballpoint pen carried with the tip end facing downward, and the smooth writing feeling and ink that the low viscosity aqueous ink ballpoint pen has Making the smoothness of follow-up appear is a point of the problem to be solved by the present invention.
[0007]
[Means for Solving the Problems]
The present invention has been made in view of such a state, and an inner wall surface of a tip caulking portion for holding a ball of a ball-point pen chip is formed in the same spherical shape as the ball, and a tip which is in contact with a ball integrally formed with a synthetic resin. A ball pressing part having a spherical surface that is slightly larger than the ball and having an outer diameter smaller than the ink conduction hole of the chip, and an outer diameter slightly smaller than the inner diameter of the ink flow passage from the center toward the rear end. A movable member composed of an ink rectifying unit having an ink passage provided by dividing a plurality of rib-shaped blades at equal intervals in the radial direction, and a close-contact coil winding portion formed at both ends thereof. A coil spring in which the outer diameter of the spring part including the inner diameter of the tip is smaller than the inner diameter of the ink flow path of the chip and the outer diameter of the coil winding part of the rear end is slightly larger than the inner diameter of the ink flow path is arranged in the chip. By, ball tip point caulking portion walls have to be configured to always contact with a pressing force in the range of 5～50Gr, and a means for solving the problems.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an aqueous gel ink having shear thinning viscosity in an ink containing cylinder or an ink viscosity of 2,000 to 10,000 mPa.s at 20 ° C. s medium-viscosity oil-based ink is stored, a follower that follows the ink consumption is loaded at the rear end of the ink, and a tail plug having a ventilation means is fixed at the rear end of the ink storage cylinder, and the ink is stored. In the ballpoint pen metal tip that fits into the tip opening of the cylinder, a ball pressing part that exposes a part from the tip tip edge to the outside and touches the rear end surface of the ball held rotatably is provided. A movable member and a coil spring that is in contact with the front end surface of the movable member on the rear end surface of the movable member so that the ball is always pressed against the inner wall of the tip end of the tip, and a valve mechanism is provided at the tip end of the tip. In the ballpoint pen refill, the movable member disposed in the chip having a valve mechanism at the tip of the tip and the coil spring make the ink from the tip of the tip even if the tip is left in a downward state. It is possible to adjust the ball pressing force through the movable member within a range that does not cause ejection and a good writing feel, and also ensures smoothness of ink followability that may cause obstacles at high speed writing etc. It is something to try.
[0009]
That is, the inner wall surface of the tip caulking portion for holding the ball of the ball-point pen metal tip is formed in the same spherical shape as the ball, and the movable member has a tip surface in contact with the ball having a spherical surface slightly larger than the ball. The ball pressing part has an outer diameter that is sufficiently smaller than the ink conduction hole of the chip, and a plurality of rib-shaped blades whose outer diameter is slightly smaller than the inner diameter of the ink flow path from the center to the rear end. An ink rectifying unit having an ink passage provided at equal intervals in the direction is integrally formed with a synthetic resin, and the coil spring is formed at least at both end portions thereof with a close coil winding portion. The outer diameter of the spring part included is made smaller than the inner diameter of the ink flow path of the chip, and the outer diameter of the coil winding part at the rear end is made slightly larger than the inner diameter of the ink flow path and is in contact with the rear end surface of the movable member. By fitting the ink flow path rear of ball-point pen tip, a tip distal crimped portion inner wall surface and the ball causes surface contact is obtained by the configurable ball pressing force in a range of 5～50Gr.
[0010]
According to the present invention, the valve seat formed on the inner wall surface of the tip end portion of the tip is different from the inner wall surface (valve seat) obtained by caulking the tip end edge inward for the purpose of simply holding the ball. During the caulking process, the tip edge of the tip is pressed against the ball, so that the inner wall surface is formed into a spherical surface that is the same shape as the ball. The movable member formed of resin is formed by an ink rectifying unit having an ink passage having a ball pressing portion tip surface formed in a spherical surface that is slightly larger than the ball and partitioned by a plurality of rib-shaped blade portions at equal intervals in the radial direction. The ball can be pressed evenly against the inner wall surface of the tip caulking portion, and the flow of ink in the ink flow path of the tip can be smoothed. Since the formed coil spring is in contact with the rear end face of the movable member and the rear end close coil winding portion is directly fitted into the chip, the ball pressing force can be easily adjusted. Thus, even if the chip is left in a downward state, ink discharge (sagging) is prevented, and a good writing feel and smooth ink followability can be obtained.
[0011]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings illustrating examples.
[0012]
FIG. 1 is an enlarged longitudinal sectional view showing the main part of the tip of the chip in order to explain the gist of the present invention relating to a ballpoint pen refill having a valve mechanism at the tip of the chip. FIG. FIG. 3 is a cross-sectional view for illustrating an ink rectifying unit of a movable member.
[0013]
As shown in FIG. 2, the ball-point refill of the present invention is a water-based gel ink having shear thinning viscosity in the ink containing cylinder 1 or an ink viscosity of 2,000 to 10,000 mPa.s at 20 ° C. The ballpoint pen ink 2 of medium viscosity oil-based ink is stored, and a follower 3 that follows the consumption of the ink is loaded at the rear end portion of the ballpoint pen ink 2, and a ventilation means 4a is provided at the rear end opening portion 1b of the ink containing cylinder. The tail plug 4 is fixed, and a part of the ball-point pen tip 5 fitted in the tip opening 1a of the ink containing cylinder 1 is exposed to the outside from the tip tip edge 5a and is rotatably held. a movable member 7 having a ball pressing portion 7a in contact with the lifting been rear end surface of the ball 6, by disposing the coil spring 8 in contact with the front surface to the rear end face of the movable member 7, always the tip end of the ball 6 It is configured to press against the caulking portion inner wall surface 5b.
[0014]
Further, the ink storage cylinder 1 will be described in detail with respect to the ink receiving cylinder 1. The narrow diameter portion 1c having the tip opening 1a to which the ballpoint pen tip 5 is fitted, and in the case of a knock-type ballpoint pen, the medium diameter portion whose front end surface is the spring seat 1d. 1e and a large-diameter portion 1f that attaches the tail plug 4 to the rear end opening 1b, and is molded by metal or synthetic resin. The front end surface of the large diameter portion 1f is provided with a groove 1g (or a protrusion (not shown) protruding from the large diameter portion to the medium diameter portion), and the front end surface of the large diameter portion 1f is locked to the shaft tube. A cap-type ballpoint pen that abuts against a stepped portion (not shown), which forms a relief passage for air in the cap that is compressed when the cap is fitted, and is configured as a ballpoint refill that can be applied to both knock-type and cap-type is there.
[0015]
The ball-point pen tip 5 is provided with a ball house 5c at the tip end cut into a taper shape. The ball house 5c has an ink conduction hole 5e penetrating the ink flow path 5d at the center and a radial piercing from the ink conduction hole 5e. A plurality of ink grooves 5f are provided, and the bottom portion is formed on a ball seat 5g when the writing pressure is applied to the ball 6. After the ball 6 is stored, the tip end edge 5a is caulked inward by a caulking jig. The ball 6 is partly exposed to the outside and is held in a freely rotatable manner.
[0016]
The ball-point pen tip 5 of the present invention is characterized by the caulking process of the tip end edge 5 a that holds the above-described ball 6, that is, the inner end wall surface 5 b of the tip end caulking part is a spherical surface having the same shape as the ball 6. Is formed. As an example of the processing means, a chip with a desired clearance caulked by providing a desired clearance so that the ball does not fall off and can be rotated as in the case of manufacturing a normal ballpoint pen tip, Insert the ball support rod and push it up so that the ball is in contact with the inner wall of the caulking part, support the ball at that position, and use the caulking jig with the tip caulking part equal to or larger than the initial caulking angle. Then, the caulking portion inner wall is press-contacted to the ball, and the caulking portion inner wall surface in contact with the ball is formed into a spherical surface having the same shape as the ball. Since such special processing is performed, a metal material such as stainless steel is used as the material of the chip, and a cemented carbide ball is suitable for the ball.
[0017]
The present invention further provides a structure for rectifying the ink flow of the movable member 7 disposed in the chip 5 formed as described above, and the ball 6 is elastically pressed against the inner wall surface 5b of the tip end of the chip with an appropriate pressing force. In addition, the coil spring 8 has a shape and mounting means that prevent ink discharge from the tip end of the chip and ensure a smooth writing feel.
[0018]
The movable member 7 is integrally molded from a synthetic resin, and has a ball press formed with a tip surface 7c in contact with the ball 6 having a slightly larger spherical surface than the ball 6 and an outer diameter sufficiently smaller than the ink conduction hole 5e of the chip 5. As shown in FIG. 3, the outer diameter of the portion 7a from the center to the rear end is slightly smaller than the inner diameter of the ink flow passage 5d of the chip 5 , and is divided at equal intervals in the radial direction by a plurality of rib-like blade portions 7d. And an ink rectifying portion 7b having an ink passage 7e. Thus, the tip surface 7c of the ball pressing portion 7a presses the ball 6 against the tip end caulking portion inner wall surface 5b without deviation, and the ink flow path 7e of the ink rectifying portion 7b causes the turbulent ink flow phenomenon via the coil spring 8. Therefore, smooth ink followability can be obtained.
[0019]
The coil spring 8 has contact coil winding portions 8a and 8b at least at both ends thereof, and the outer diameter of the spring portion 8c including the tip contact coil winding portion 8a is smaller than the inner diameter of the ink flow passage 5d of the chip 5 and the rear end. The outer diameter of the contact coil winding portion 8b is slightly larger than the inner diameter of the ink flow passage 5d. In addition, the coil spring 8 has a slight difference in diameter between the outer diameters of the front end close coil winding portion 8a and the rear end close coil winding portion 8b, and the shape including the spring portion 8c is the rear end close coil winding portion 8b. Even if the diameter is only large, the diameter may be varied by making the shape conical from the front end toward the rear end. Further, although it is not a problem to provide a close coil winding portion on a part of the spring portion 8c, it is not preferable to make the outer diameter of the tip close coil winding portion 8a extremely small.
[0020]
In the present invention, the movable member 7 and the coil spring 8 formed as described above are first brought into the ink flow path 5d of the chip 5 , the tip surface 7c of the movable member ball pressing portion 7a is brought into contact with the ball 6, and The front end surface of the coil spring front end close coil winding portion 8a is brought into contact with the rear end surface of the ink rectifying portion 7b, and the rear end close contact coil winding portion 8b is fitted to the rear portion of the ink flow passage 5d of the chip 5 and disposed. Thus, the tip end caulking portion inner wall surface 5b and the ball 6 are brought into surface contact, and the ball pressing force can be attached within a range of 5 to 50 gr by simple means. Here, the reason for setting the range of the ball pressing force is that if the ball pressing force is 5 gr or less, there is a problem in the performance of preventing ink discharge from the tip of the tip, and if the ball pressing force is 50 gr or more, the writing surface is smooth. This is because not only the writing feeling is impaired, but also bad effects such as incomplete handwriting such as a blurred state appear.
[0021]
Thus, the present invention has been made to provide a ballpoint refill that can be used for both a knock-type ballpoint pen and a cap-type ballpoint pen and has a smooth writing feel. The follower 3 loaded at the rear end of the ballpoint pen ink 2 follows the ink consumption and prevents backflow of the ink, and is a highly viscous gel that does not mix with the ink or replace the ink. Or a combination of a plastic float (not shown) and a liquid stopper. Further, the tail plug 4 fixed to the rear end opening 1b of the ink reservoir tube 1, which was provided with ventilation means 4a such as air grooves or air holes on the outer peripheral surface or the rear surface, thereby the ink reservoir tube 1 It connects the inside and outside air.
[0022]
【The invention's effect】
In the present invention configured as described above, a synergistic effect such as a valve mechanism in which the inner wall surface (valve seat) of the tip end of the tip and the ball are in surface contact with each other, the shape of the movable member disposed in the tip, the means for attaching the coil spring, etc. Water-based gel ink having shear thinning viscosity or ink viscosity at 20 ° C. of 2,000 to 10,000 mPa.s. In ballpoint pen refills using s medium-viscosity oil-based inks, ink discharge from the tip of the tip is completely prevented, smooth writing feel is maintained, and even in special writing such as early writing, There is an effect that the ink sufficiently follows without causing turbulent flow.
[0023]
In addition to the above performance effects, the use of a movable member with an ink rectifying unit ensures a short and short period of time for centrifugal filling to remove bubbles in the ink, which is a refill manufacturing process. The coil spring has a relatively large coil diameter and a small overall diameter difference, so there are advantages such as a wide selection of wire diameters and good workability in winding work, and the movable member itself is also a synthetic resin. There are some which have a great cost effect.
[Brief description of the drawings]
FIG. 1 is a partially cutaway longitudinal sectional view showing an enlarged main portion of a tip of a ballpoint pen refill according to an embodiment of the present invention.
FIG. 2 is a total longitudinal sectional view of a ballpoint pen refill according to an embodiment of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
1 ink storage cylinder 1a front end opening 1b rear end opening 2 ballpoint pen ink 3 follower 4 tail plug
5 ball pen tip 5a tip tip edge 5b tip caulking inner wall surface 5d ink flow path 5e ink conduction hole 6 ball
7 Movable member 7a Ball pressing part 7b Ink rectification part 7c End face 7d Rib-like blade part 7e Ink passage
8- coil spring 8a Front-end close coil winding part 8b Rear-end close coil winding part 8c Spring part

Claims (2)

The ink for the ballpoint pen is stored in the ink storage cylinder, a follower is loaded at the rear end of the ink as the ink is consumed, and a tail plug having a ventilation means is fixed at the rear end of the ink storage cylinder. In a ballpoint pen metal tip that fits in the tip opening of the housing cylinder, a ball pressing portion that is partly exposed outward from the tip tip edge and is in contact with the rear end surface of the ball that is rotatably held. Provided with a valve mechanism at the tip end of the tip, the movable member provided, and a coil spring that contacts the front end face of the movable member at the rear end face of the movable member are arranged so that the ball is always pressed against the inner wall of the tip end of the tip. in consisting ballpoint refill, the ballpoint pen ink (2) is an aqueous gel ink having shear thinning, embraces the ball (6) of the ball point metal tip (5) above And forming a crimped portion in the wall surface (5b) on the ball and the spherical, said movable member (7), also the distal end surface in contact with the balls (7c) slightly larger sphere than the ball, the ink conducting its outer diameter chips A ball pressing portion (7a) formed with a sufficiently small diameter from the hole (5c), and a plurality of rib-shaped blade portions whose outer diameter is slightly smaller than the inner diameter of the ink flow passage (5d) of the chip from the center to the rear end. (7d) and an ink rectifying portion (7b) having an ink passage (7e) provided at equal intervals in the radial direction are integrally formed of synthetic resin, and the coil spring ( 8 ) is at least at both ends thereof. A close contact coil winding portion is formed, and the outer diameter of the spring portion (8c) including the close contact coil winding portion (8a) is made smaller than the inner diameter of the ink flow path of the chip, and the outer diameter of the rear end close contact coil winding portion (8b). Slightly larger than the inner diameter of the ink flow path Formed in, in contact with the rear end surface of the movable member (7), by fitting the ink flow path rear of the ballpoint pen tip (5), the tip end caulked portion inner wall surface (5b) and a ball (6) A ballpoint refill provided with a valve mechanism at the tip end of the chip, wherein the ball pressing force can be set in a range of 5 to 50 gr while being brought into surface contact. The ballpoint pen ink (2) stored in the ink containing cylinder ( 1 ) has an ink viscosity of 2,000 to 10,000 mPa.s at 20 ° C. 2. A ballpoint pen refill comprising a tip end portion provided with a valve mechanism, which is a medium-viscosity oil-based ink of s.

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