JP4205290B2 - Ballpoint pen and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ballpoint pen and a method for manufacturing the same. In the present invention, “front” refers to the pen tip side, and “rear” refers to the tail plug side.
[0002]
[Prior art]
Conventionally, in this type of ballpoint pen, a pen point holder having a collar is press-fitted and fixed to a front end opening of an ink containing tube, ink is filled into the ink containing tube, and the ink containing tube is placed inside the shaft tube. Inserted from the front end opening of the shaft tube, the flange is brought into contact with the front end of the shaft tube, and a front body (a base) is screwed onto the outer surface of the front end portion of the shaft tube, and the inner surface of the front body is A structure is known in which the pen tip holder is clamped and fixed by being brought into pressure contact with the outer surface (or collar) of the pen tip holder. (For example, Japanese Utility Model Publication No. 6-63376)
[0003]
The conventional ballpoint pen manufacturing method is a ballpoint pen refill manufacturing process in which a pen tip holder provided with a pen tip is press-fitted and fixed to a front end opening of an ink containing tube and then filled with ink from a rear end opening of the ink containing tube. (A) and a refill assembling step (b) in which the ballpoint pen refill is inserted from the front end opening of the shaft tube, and then a tip is screwed onto the front end of the shaft tube.
[Problems to be solved by the invention]
[0004]
The conventional ballpoint pen has a large number of parts and is difficult to provide at low cost. In particular, when a metal tip is employed, the cost is further increased. Moreover, since the tip of the conventional ballpoint pen is attached by screwing, the tip may be loosened during writing, and the tip of the pen may be wobbled.
[0005]
Since the conventional ballpoint pen manufacturing method includes the two steps (a) and (b), it cannot be a series of manufacturing steps, which increases the manufacturing cost.
[0006]
The present invention solves the above-mentioned conventional problems, and provides a ballpoint pen capable of reducing the number of parts, suppressing the manufacturing cost, and suppressing wobbling of the pen tip during writing, and It is an object of the present invention to provide a ballpoint pen manufacturing method capable of reducing the manufacturing cost through a series of manufacturing processes.
[0007]
[Means for Solving the Problems]
[1] The ballpoint pen 1 of the present invention includes a pen tip holder 3 that holds the pen tip 2 at the front, an ink storage tube 4 that is press-fitted and fixed to the rear outer surface of the pen tip holder 3, and the ink storage tube 4 The shaft cylinder 5 is housed inside and protrudes the pen tip 2 from the front end. The pen tip holder 3 is provided with a collar 31 that contacts the front end of the shaft cylinder 5, and the pen behind the collar 31 is provided. Provided on the outer surface of the tip holder 3 is a first fitting portion 32 that is press-fitted and fixed into the holder mounting hole 51 at the front end of the shaft cylinder 5. The pen fitting holder 3 is provided on the outer surface behind the first fitting portion 32. A second fitting portion 33 that is press-fitted and fixed to the front end opening of the ink storage tube 4 is provided, and the inner surface of the shaft cylinder 5 behind the holder mounting hole 51 is axially aligned with the front end of the ink storage tube 4. It is a requirement that the regulating wall 52 to be in contact is provided (claim 1).
[0008]
(Function)
Since the ballpoint pen 1 according to the first aspect of the present invention does not require a metal tip or the like, the number of parts is reduced, the structure is simple, and it can be provided at low cost. Furthermore, it is not a conventional structure (that is, a structure in which the nib holder is clamped and fixed to the shaft cylinder by screwing the tip or the like), but a structure in which the nib holder 3 is directly fixed to the shaft cylinder 5. The wobbling of the nib 2 during writing is sufficiently suppressed.
[0009]
Further, by providing the inner wall of the shaft cylinder 5 with the restriction wall 52 that abuts the front end of the ink containing tube 4 in the axial direction, the axial positioning of the ink containing tube 4 is ensured, and the occurrence of assembly failure is suppressed. be able to. If the restriction wall 52 does not exist on the inner surface of the shaft cylinder 5 (for example, instead of providing the restriction wall on the inner surface of the shaft cylinder, the front end of the ink containing tube can abut on the outer surface of the pen tip holder. In the case where a step-shaped restriction wall is provided), it is difficult to provide the restriction wall in the radial direction high on the outer surface of the pen tip holder, and thus there is a risk that sufficient contact between the ink storage tube and the restriction wall cannot be achieved. is there.
[0010]
[2] In the ballpoint pen 1 of the second aspect, a guide rib 53 extending in the axial direction for guiding the outer surface of the ink containing tube 4 to the axial center is provided on the inner surface of the shaft cylinder 5 behind the regulating wall 52. 2) is preferred.
[0011]
(Function)
In the ballpoint pen 1 of the second aspect, when the ink containing tube 4 is inserted into the shaft tube 5 from the rear end opening of the shaft tube 5, the outer surface of the front end portion of the ink containing tube 4 and the guide rib 53 slide smoothly. As a result, the ink storage tube 4 is guided (ie, centered) to the axial center of the shaft tube 5. Therefore, smooth assemblability between the second fitting portion 33 of the pen tip holder 3 and the front end opening of the ink containing tube 4 is obtained.
[0012]
[3] Further, in the ballpoint pen manufacturing method of the present invention, the pen tip holder 3 having the pen tip 2 at the front portion is press-fitted and fixed to the front end opening of the shaft tube 5, and then the inside of the shaft tube 5. The ink storage tube 4 is inserted from the rear end opening of the shaft tube 5, and the rear outer surface of the pen tip holder 3 is press-fitted and fixed to the inner surface of the front end opening of the ink storage tube 4. The ink 41 is filled from the rear end opening of the ink containing tube 4 (Claim 3).
[0013]
(Function)
In the ballpoint pen manufacturing method of the third aspect, the manufacturing process is a series, the manufacturing time is shortened, and the manufacturing cost can be reduced.
[0014]
[4] In the ballpoint pen manufacturing method according to claim 3, the rear outer surface of the pen tip holder 3 is press-fitted and fixed to the inner surface of the opening of the front end of the ink storage tube 4, and at the same time the front end of the ink storage tube 4 and the shaft cylinder 5 It is preferable that the inner wall is in contact with the axial direction (claim 4).
[0015]
(Function)
According to the ballpoint pen manufacturing method of the fourth aspect, the axial positioning of the ink containing tube 4 is facilitated. If the front end of the ink storage tube 4 and the inner wall of the shaft cylinder 5 are not brought into contact with each other in the axial direction, obtaining a certain amount of press-fitting dimensions at the front end of the ink storage tube 4 Difficult due to variations in longitudinal dimensions. However, by bringing the front end of the ink containing tube 4 and the inner wall of the shaft cylinder 5 into contact with each other in the axial direction, a constant pressing force is applied even if the longitudinal dimension of the ink containing tube 4 varies. Only a fixed press-fit dimension can be obtained, and the press-fit dimension can be easily managed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 shows a ballpoint pen 1 of the present invention. The ballpoint pen 1 includes a pen tip holder 3 in which a pen tip 2 is press-fitted and held at the front portion, an ink storage tube 4 to which the pen tip holder 3 is fixed to a front end opening, and the ink storage tube 4 stored therein. The pen tip holder 3 includes a shaft cylinder 5 fixed to the front end opening, and a tail plug 6 press-fitted and fixed to the rear end opening of the shaft cylinder 5.
[0018]
An ink 41 (for example, a water-based gel ink imparted with shear thinning viscosity or a medium-viscosity oil-based ink) and a grease-like shape that advances to the rear end of the ink 41 as the ink is consumed are disposed inside the ink storage tube 4. The follower 42 is filled.
[0019]
The pen nib 2 is a ball-point pen nib composed of a metal main body that rotatably holds a ball at the front end. The nib 2 has several types of ball receiving seats, for example, a type in which the ball receiving seat is formed by pressing and deforming the side wall of the metal main body inward, and the ball receiving seat is made of metal. Examples include a type formed by cutting the inner wall of the main body, and a type in which the ball receiving seat is constituted by another member such as a synthetic resin.
[0020]
The nib holder 3 is obtained by injection molding of synthetic resin. The pen tip holder 3 is a cylindrical body having a hole penetrating in the axial direction (that is, a pen tip mounting hole and an ink distribution hole behind the pen tip holder 3). The outside of the nib holder 3 includes a tapered front end portion, a flange portion 31 formed behind the tapered front end portion, a first fitting portion 32 formed behind the flange portion 31, and the first And a second fitting portion 33 formed behind the first fitting portion 32. The outer surface of the first fitting portion 32 is press-fitted and fixed to the inner surface of the front end opening of the shaft cylinder 5, and the outer surface of the second fitting portion 33 is press-fitted into the inner surface of the front end opening of the ink containing tube 4. It is fixed.
[0021]
The shaft cylinder 5 is a cylinder body that is obtained by injection molding of synthetic resin, has a tapered front end portion, and has a hole penetrating in the axial direction inside. The front end opening of the shaft cylinder 5 serves as a holder mounting hole 51, and the first fitting portion 32 of the nib holder 3 is press-fitted and fixed thereto. Further, a step-shaped regulating wall 52 is formed on the inner surface of the shaft cylinder 5 behind the holder mounting hole 51, and the front end of the ink containing tube 4 is brought into contact therewith.
[0022]
In addition, since the inner diameter of the holder mounting hole 51 can be set to a small diameter by making the front end portion of the shaft cylinder 5 tapered, the inner surface of the shaft cylinder 5 behind the holder mounting hole 51 and the rear outer surface of the pen tip holder 3 are arranged. A regulating wall 52 that can form an annular space into which the front end portion of the ink containing tube 4 having a sufficient thickness can be inserted, and has a sufficient radial height on the inner surface of the shaft tube 5. Can be formed. Thereby, the ink container 4 and the regulation wall 52 can be reliably brought into contact with each other.
[0023]
Further, a plurality of guide ribs 53 extending in the axial direction protrude from the inner surface of the shaft cylinder 5 on the rear side of the restriction wall 52. The guide rib 53 is only required to be in sliding contact with the outer surface of the ink containing tube 4, and the inner diameter (that is, the diameter of the inscribed circle) is set slightly larger than the outer diameter of the front end portion of the ink containing tube 4.
[0024]
Further, a radial groove 55 is formed on the front end surface of the shaft cylinder 5, and an axial groove communicating with the radial groove 55 on the outer surface of the first fitting portion 32 of the nib holder 3. 32a is formed, and a radial groove 52a communicating with the groove 32a is formed in the restriction wall 52 of the shaft cylinder 5. The groove 55 on the front end surface of the shaft cylinder 5 communicates with the outside air, and the groove 52 a of the restriction wall 52 communicates with the gap 54 between the outer surface of the ink containing tube 4 and the inner surface of the shaft cylinder 5. The gap 54 communicates with the rear end opening of the ink containing tube 4. Accordingly, the groove 55 on the front end surface of the shaft cylinder 5, the groove 32 a of the first fitting portion 32, the groove 52 a of the restriction wall 52, and the space between the outer surface of the ink containing tube 4 and the inner surface of the shaft cylinder 5. The gap 54 forms an air passage that communicates the rear end opening of the ink containing tube 4 with the outside air.
[0025]
Instead of providing the groove 55 on the front end surface of the shaft cylinder 5, a radial groove may be provided on the rear end surface of the collar portion 31 of the nib holder 3. Instead of providing the groove 32 a on the outer surface of the pen tip holder 3, an axial groove may be provided on the inner surface of the holder mounting hole 51 of the shaft cylinder 5. Further, instead of providing the groove 52 a in the restriction wall 52, a radial groove may be provided in the front end surface of the ink containing tube 4. That is, a ventilation means (for example, the groove 55) between the front end surface of the shaft cylinder 5 and the collar portion 31 of the nib holder 3, the inner surface of the holder mounting hole 51 of the shaft cylinder 5, and the first fitting of the nib holder 3 Ventilation means (for example, the groove 32a) between the outer surfaces of the joint portion 32, a ventilation means (for example, the groove 52a) between the restriction wall 52 of the shaft cylinder 5 and the front end surface of the ink storage tube 4, and the ink storage tube 4 By virtue of the ventilation means (for example, the gap 54) between the outer surface of the ink pipe 5 and the inner surface of the shaft cylinder 5, an air passage that communicates the rear end opening of the ink containing tube 4 and the outside air is formed.
[0026]
Further, the tail plug 6 is a bottomed cylindrical body, and two protrusions 61 are formed on the front end surface at axially symmetrical positions. The protrusion 61 supports the rear end surface of the ink containing tube 4 in pressure contact.
[0027]
FIG. 2 shows an embodiment of the ballpoint pen manufacturing method of the present invention. The parts [that is, the pen tip 2, the pen tip holder 3, the ink storage tube 4 (including the ink 41 and the follower 42) shaft cylinder 5 and the tail plug 6] are all the same as those described in FIG. Is adopted.
[0028]
Below, a manufacturing method is demonstrated in order according to Fig.2 (a)-FIG.2 (f).
[0029]
2A to 2B, the pen tip holder 3 holding the pen tip 2 is press-fitted into the front end opening (holder mounting hole 51) of the shaft tube 5, and the pen tip holder 3 The part 31 is brought into contact with the front end surface of the shaft cylinder 5.
[0030]
Next, as shown in FIGS. 2C to 2D, the ink containing tube 4 is inserted into the shaft tube 5 from the rear end opening of the shaft tube 5, and the guide rib 53 on the inner surface of the shaft tube 5 is inserted. While the front end portion of the ink containing tube 4 is guided axially by the above, the outer surface of the rear end portion of the pen tip holder 3 (that is, the outer surface of the second fitting portion 33) is pressed into the inner surface of the front end portion of the ink containing tube 4 at the same time. The front end of the ink containing tube 4 is brought into contact with the restriction wall 52 of the shaft cylinder 5 in the axial direction.
[0031]
Thereafter, as shown in FIG. 2 (e), the ink 41 and the follower 42 are filled into the ink containing tube 4 from the rear end opening of the ink containing tube 4. Finally, as shown in FIG. 2 (f), the tail plug 6 is press-fitted into the rear end opening of the shaft tube 5.
[0032]
Since the manufacturing method is a series of manufacturing steps, the manufacturing time can be shortened and the manufacturing cost can be reduced.
[0033]
【The invention's effect】
Since the ballpoint pen according to the first aspect does not require a metal tip or the like, the number of parts is reduced, the structure is simple, and the ballpoint pen can be provided at a low cost. Furthermore, since the pen tip holder is directly fixed to the shaft cylinder, wobbling of the pen tip during writing is sufficiently suppressed.
[0034]
In the ballpoint pen according to the second aspect, the pen tip holder and the front end opening of the ink storage tube can be smoothly assembled.
[0035]
According to the ballpoint pen manufacturing method of the third aspect, the manufacturing process can be made a series, and the manufacturing cost can be reduced.
[0036]
According to the ballpoint pen manufacturing method of the fourth aspect, the axial positioning of the ink containing tube is facilitated.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of the ballpoint pen of the present invention.
FIG. 2 is a diagram for explaining a method of manufacturing the ballpoint pen of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Pen tip 3 Pen tip holder 31 The collar part 32 The 1st fitting part 32a Groove 33 The 2nd fitting part 4 Ink accommodating pipe 41 Ink 42 Following body 5 Shaft cylinder 51 Holder attachment hole 52 Restriction wall 52a Groove 53 Guide rib 54 Gap 55 Groove 6 Tail plug 61 Projection

Claims (4)

A pen nib holder for holding the nib at the front, an ink storage tube press-fitted to the rear outer surface of the pen nib holder, and a shaft cylinder for housing the ink storage tube and projecting the nib from the front end And a first collar portion is provided on the outer surface of the nib holder to be in contact with the front end of the shaft cylinder, and is press-fitted and fixed to the outer surface of the nib holder behind the collar section in the holder mounting hole at the front end of the shaft cylinder. A second fitting portion that is press-fitted and fixed to the front end opening of the ink containing tube on the outer surface of the pen tip holder behind the first fitting portion. A ballpoint pen characterized in that a regulating wall is provided on an inner surface of a rear shaft cylinder so as to abut the front end of the ink storage tube in the axial direction. The ballpoint pen according to claim 1, wherein a guide rib extending in an axial direction for guiding the outer surface of the ink containing tube to the axial center is provided on the inner surface of the shaft cylinder behind the regulating wall. A pen nib holder having a nib at the front is press-fitted and fixed to the front end opening of the shaft cylinder, and then an ink storage tube is inserted into the shaft cylinder from the rear end opening of the shaft cylinder. A ballpoint pen comprising: a rear outer surface of a pen tip holder is press-fitted and fixed to an inner surface of a front end opening of a storage tube, and then ink is filled into the ink storage tube from a rear end opening of the ink storage tube. Manufacturing method. The ballpoint pen according to claim 3, wherein the rear outer surface of the pen tip holder is press-fitted and fixed to the inner surface of the opening of the front end of the ink storage tube, and at the same time, the front end of the ink storage tube and the inner wall of the shaft cylinder are contacted in the axial direction. Production method.

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