JPS6143199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a felt-tip pen in which ink is always smoothly fed to the nib portion at the tip of the pen core, and an efficient method for manufacturing the felt-tip pen by which the felt-tip pen can be manufactured efficiently.

Conventional felt-tip pens include those in which a pen core c with a small diameter insertion portion d is inserted from the outside into an insertion hole b at the tip of a barrel a, as shown in Figure 1A, and one in which a pen core c with a small diameter insertion part d is inserted from the outside, as shown in Figure 1B. There is a known type in which a concave and convex m is carved in the middle part of the pen core c' and the rear end d, and a solvent is applied to the concave and convex part, and the pen is inserted and fixed through the insertion hole b' at the tip of the barrel a'. ing.

However, the pen core c in the former felt-tip pen is
Since it is simply inserted into the insertion hole b of the barrel, if there is an error in the insertion hole of the barrel or the inner or outer diameter of the pen core, it may be difficult to insert or the pen core may loosen as it is used. The insertion part d of the pen core that intervenes in the ink swab e is easy to escape from the barrel a, and the insertion part d of the pen core that intervenes with the ink swab e is small, so not only does the flow of ink lack smoothness, but also the pen core and the ink swab e may easily escape due to impulses or unexpected drops. Pen nib c. When cutting the insertion part d, which has a small diameter due to its shape, as shown in Fig. 2, the tip of the cutting machine K is brought into sliding contact with the tip of the cutting machine K while supporting one end of the pen core base that becomes the nib part P. Because of this, it is pushed up by the sliding pressure of the cutting edge, so it is likely to be cut into an incorrect shape, making it difficult to tightly insert the pen core into the insertion hole b of the barrel a. When they are stored, they cannot be stored in an orderly manner due to their shape and are piled up in a disorderly manner, making it difficult to take them out one by one, which impedes work efficiency and therefore has the disadvantage that manufacturing cannot be carried out efficiently. It is.

Moreover, the latter requires extra materials and labor to carve the unevenness m on the insertion part of the pen core and apply solvent, so it is difficult to manufacture efficiently.
Since the inner end of the pen core d' inserted through the insertion hole b' of a' is small, the contact surface with the ink swab e' is small, or it is immersed too much, so as in the former case, the flow of ink is interrupted or it overflows. Since it leaks from the ventilation hole, there is also a risk that writing may be hindered.

The present invention relates to a felt-tip pen that eliminates all the disadvantages of the conventional felt pens and an efficient manufacturing method thereof.That is, the present invention relates to a felt-tip pen that eliminates all the disadvantages of the conventional felt pens, and an efficient manufacturing method thereof. An integrated synthetic fiber pen core with a small diameter shaft 1a in the middle part is provided,
However, the tip is provided with an insertion hole 5 having a diameter that fits the small-diameter shaft 1a of the pen core, and a shaft tube 4 made of synthetic resin that is connected to the insertion hole and has a loose semi-conical inner wall R formed inside the tip. The pen core is pushed in from the rear end of the barrel so that the nib portion 1b at the tip thereof protrudes outside through the insertion hole 5 at the tip of the barrel 4, and then a rod-shaped ink swab 7 is inserted from the rear end of the coaxial barrel. A felt-tip pen according to the present invention can be obtained by inserting a synthetic resin tail plug 8 into the rear end opening of the rear barrel 4 and inserting the rear end 6 of the pen core into the tip thereof.

As described above, in the felt-tip pen of the present invention, the integral pen core 1 is inserted from the rear end of the barrel barrel 4, with the nib portion 1b and the rear end portion 1c having the same thick diameter and the thin shaft 1a between them. Then, push the large-diameter nib portion 1b at the tip so that it protrudes from the insertion hole 5 at the tip of the barrel, and insert the large-diameter rear end 1c of the pen core into the tip of the ink swab 7 inserted into the barrel. Therefore, ink is sufficiently occluded by the wide contact surface and sent to the nib portion 1b via the narrow diameter portion 1a, so that writing is always performed smoothly.

However, even if this felt-tip pen is accidentally dropped or subjected to an impulse, the rear end 1c of the pen core 1 prevents it from escaping through the insertion hole 5, so it has the practical benefit of being able to be used for a long time without worrying about accidental damage. It is something to do.

However, the pen core 1 of the felt-tip pen in the present invention
The shape of the pen tip part 1b and the rear end part 1 are as shown above.
c with a thick same diameter via the small diameter shaft 1a, and the shaft cylinder 4
Since a loose semi-conical inner wall R connected to the insertion hole 5 is formed inside the tip, a pen core 1 that is always in the correct shape can be obtained as shown below. 4, it can be assembled much more efficiently.

That is, in the pen core 1 of the present invention, each circular pen core body is cut into equal lengths, and the ends of the nib portion 1b and the rear end portion 1c are placed opposite each other as shown in FIG. The small diameter shaft 1 is supported by the respective supporting metal fittings 2 and 2', and the central part is cut with a cutting tool 3.
a, the pen core 1 is always obtained in the correct shape, and when these pen cores are assembled with the barrel 4, there is a groove wheel 11 that rotates intermittently at the lower end as shown in FIG. When placed in the hopper 10, the hopper 10 is stacked in an orderly manner due to its shape, so that it is securely held in each groove by the rotation of the groove wheel 11, and is placed intermittently behind one groove of the groove wheel. When the rear end of the barrel 4 faces the front surface of the groove of the groove wheel 11 corresponding to the push rod 6 that advances and retreats, the push rod operates and the pen core 1 in the groove is pushed into the barrel 4. By providing the pen core, the pen core has a semi-conical inner wall R inside the barrel 4.
It is guided by the cylinder, and is pressed and protrudes from the insertion hole 5 at the tip of the barrel. In this way, the ink swab 7 is inserted into the barrel from the rear end of the barrel 4 using a push rod or the like in the next ink swab 7 insertion device, and the rear end 1c of the pen core 1 is inserted into the tip of the ink swab 7. The assembly is then completed by fitting the tail plug 8 made of synthetic resin into the rear end opening of each shaft cylinder 4.

As described above, the present invention is characterized by the shape and structure of the pen core and barrel, so that ink is always smoothly delivered to the nib portion during use, making it easy to write and preventing the felt-tip pen from falling or being shocked during use. It also has the practical benefit of being able to be used for a long time since the pen core will not accidentally escape even if the pen is exposed to water.

However, in addition to the above-mentioned mechanical work on the shape and structure of the pen core and barrel, the present invention has the advantage that felt-tip pens can be mass-produced at low cost. This is an extremely useful invention as a method.

[Brief explanation of the drawing]

The figures show examples. Figures 1A and B are longitudinal sectional side views of the main parts of an example of a conventional felt-tip pen, and Figure 2 is a partial view of the processing state of the pen core in Figure 1A. Fig. 3 is a side view of the pen core in this felt-tip pen, Fig. 4 is a partially cross-sectional side view showing the state in which the same pen core is processed, and Fig. 5 is the same pen as above. FIG. 6 is a perspective view of a longitudinal section of the hopper showing a partial embodiment of a manufacturing method in which a large number of leads are accommodated in a hopper and sent one by one to a groove wheel at the bottom. FIG. 7 is a vertical side view of the main parts shown, and FIG. 7 is a vertical side view of the completed felt-tip pen. 1 is a pen core, 1a is a small diameter shaft, 1b is a pen nib, 4 is a barrel tube, 5 is an insertion hole, 6 is a push rod, 7 is a rod-shaped ink swab, and R is a semi-conical inner wall.

Claims (1)

[Scope of Claims] 1. An integrated pen core is provided in which the tip end and the rear end have the same large diameter and a small diameter shaft is provided in the middle, and the nib end of the pen core is made of: The inner side of the tip protrudes from the insertion hole of the barrel, which is formed in a loose semi-conical inner wall connected to the insertion hole of the tip, and the tip of the rod-shaped ink swab housed in the barrel is communicated with the rear end of the pen core. The felt-tip pen is characterized in that a tail plug is fitted to the rear end of the barrel. 2. The pen core of the felt-tip pen according to claim 1 is made by supporting a thick circular pen core body which has been cut into equal lengths in advance with support metals placed opposite each other on the left and right sides, and cutting the middle part of the core to form a small diameter shaft. The pen core is made up of a shaft tube, which has an insertion hole at the tip with an inner diameter that fits the small diameter shaft of the pen core, and a shaft cylinder with a gentle semi-conical inner wall connected to the insertion hole on the inside of the tip. The tip of the nib is pushed in from the rear end with a push rod to make it protrude from the insertion hole, and then the rear end of the nib is immersed in the tip of the stick-shaped ink swab inserted from the rear end of the barrel, and then the shaft is inserted. An efficient method for manufacturing a felt-tip pen, characterized by fitting a tail plug to the rear end of a barrel.