JP2808345B2 - Writing part of small tube type writing implement and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] In order to obtain a center of a predetermined length from a pen body, an inner pendulum having a fixed center is fitted to an outer pendulum so as to be slidable in the longitudinal direction. The present invention relates to a writing section of a small tubular writing instrument configured as described above, and a method of manufacturing the writing section.

[Conventional technology]

In the writing part of the conventional small tube type writing instrument, when the core fixed to the pendulum protrudes from the pen body, the core is bent,
In addition, since writing cannot be performed unless the core projects from the pen body, the projection length of the core is configured with extremely high precision. Conventionally, in order to obtain the center of the predetermined length, the length from the inner stage of the holder to the tip of the pen body and the length from the front end of the pendulum to the tip of the core are accurately assembled. I was

[Problems to be solved by the invention]

Therefore, in order to assemble the centering from the pen body with high accuracy, the dimensions and assembly accuracy of parts are required to be high, and in actual production, it is very difficult to keep the centering within a range where good writing can be performed. It was difficult.

Therefore, it is necessary to perform a 100% inspection after assembly,
Objects out of the specified range and out of the center were removed as defective, which was a significant cause of cost increase.

[Means for solving the problem]

According to a first aspect of the present invention, a completed core is fixed to an inner pendulum, an outer pendulum is fitted to the inner pendulum so as to be adjustable in a longitudinal direction, and a completed pendulum is formed. Built to be slidable.

Further, in the second invention, the inner pendulum having the fixed center is fitted to the outer pendulum appropriately rearward from a predetermined position, and the center, the inner pendulum and the outer pendulum are inserted into a holder provided with a pen body at the tip, Thereafter, the outer pendulum is pressed forward in the longitudinal direction, and the amount of protrusion of the center core tip is measured by a displacement sensor with reference to the tip of the pen body. When the amount of protrusion of the center core reaches a predetermined length, the outer pendulum is This is a manufacturing method in which the pressing is released and the center core is always protruded from the pen body by a predetermined length.

〔Example〕

The present invention will be described with reference to the embodiment shown in FIG. At the tip of the pendulum 1 made of a metal pipe such as stainless steel,
The metal core 2 is attached by caulking applying a force from the outer peripheral direction of the inner pendulum 1. The caulked portion 1A is flattened as shown in FIG. 2 and bulges outward.
It is preferable that this caulking be performed at a plurality of positions in order to stabilize the attachment of the core 2. In addition, as a process of caulking the core 2 to the inner pendulum 1, as shown in FIG. 3, the caulked portion 101A of the inner pendulum 101 may be formed in a rhombic cross section.
Further, the inner pendulum 1 is inserted into the inner hole 3A of the outer pendulum 3 made of synthetic resin.
And the inner hole 3A of the outer pendulum 3 and the flattened caulking portion 1A of the inner pendulum 1 are fitted together, and the rear end of the inner pendulum 1 is protruded rearward in the longitudinal direction from the outer pendulum 3, so that the temporary mounting is performed. At this point, the inner pendulum 1 is fitted to the outer pendulum 3 at an appropriate position in the longitudinal direction from a predetermined position. This fitting force is preferably about 300 g in order to finely adjust the inner pendulum 1 and the outer pendulum 3 in the longitudinal direction.
A plurality of protrusions 3B extending in the longitudinal direction are formed on the outer periphery of the outer pendulum 3, and smoothly guide the ink to the tip of the outer pendulum 3. A rubber O-ring 4 is externally fitted to the rear end of the inner pendulum 1 protruding from the outer pendulum 3, and a spring 5 having a very low elastic force is fitted to the O-ring 4. The core 2, the inner pendulum 1, and the outer pendulum 3 are inserted into a holder 7 to which a pen 6 made of a hard thin tube made of ceramic or the like is attached, and the core 2 is inserted into the pen 6. Thereafter, as shown in FIG. 4, the pen core 8 is attached to the holder 7 from the rear in the longitudinal direction.
If the pen core 8 is attached to the holder 7 without fitting the spring 5 to the O-ring 4, when the pen core 8 is put on the outer pendulum 3 as shown in FIG. The inner stage 8A and the spring 5 come off while the pen core 8 is being covered, and the spring 5 comes off from the rear end of the inner pendulum 1 due to the repulsive force of the compressed spring 5. Spring 5 as shown
May get under the pendulum 1
If the ring 4 is provided, reliable mounting can be performed.

However, it goes without saying that the objects of the present invention can be achieved with the embodiment shown in FIGS. 5 and 6.

Then, as shown in FIG.
Is attached, the outer pendulum 3 is brought into contact with the locking step 7A of the holder 7, and the rear end of the inner pendulum 1 is pressed by the pressing jig 9 fixed to the motor. When the amount of protrusion of the core 2 becomes a predetermined length L with reference to the tip of the inner pendulum, the pressing of the inner pendulum 1 is released to constitute a completed pendulum. Therefore, the core 2 can be protruded from the pen body 6 by a predetermined length L.

Further, a metal tip 11 for protecting the pen body 6 is attached to the tip of the holder 7 to form a writing portion of a small tube type writing instrument. This writing unit is completed as a small tube type writing instrument by fixing a pen core 8 to an ink tank storing ink, as is generally used in the past, and is used as a writing instrument for drafting or a writing instrument for a plotter.

Although a comb groove 8B for adjusting the internal pressure in the ink tank is formed on the outer periphery of the pen core 8, the present invention is not limited to this configuration, and for example, a conventional groove such as a spiral groove is used. Various shapes are available.

Further, as shown in FIG. 8, the inner pendulum is fitted to the outer pendulum at a proper position of the inner pendulum 201 as shown in FIG.
And the raised portion 201B is fitted to the outer pendulum 3 or, as shown in FIGS. 9 and 10, the outer pendulum
The inner pendulum 301 may be fitted to the inner projection 103C provided on the 103.

Furthermore, in the above-described embodiment, the description has been made of a metal. However, the present invention is not limited to the above-described configuration, and the core is made of a synthetic resin, and is formed by forming a groove extending in the longitudinal direction on the outer periphery thereof. Even if there is no problem, the holder with the pen body fixed and the pen core are integrally formed by synthetic resin molding, the stopper is pressed into the rear of the pen core and fixed, and the completed pendulum can slide in the pen core. It may have a built-in structure.

In addition, the external pendulum is urged forward by a spring in the longitudinal direction, but the spring is not always necessary.
The pendulum and the pendulum may be loosely fitted in the holder and the pen core.

〔The invention's effect〕

As described above, the present invention is characterized in that the inner pendulum to which the center is fixed is fitted to the outer pendulum so as to be adjustable in the longitudinal direction. Can be produced with extremely high precision and without variation, and inspection after assembly is not required, so that productivity is remarkably improved and the rejection rate is reduced, thereby enabling production at a low price.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a writing section of a small tube writing instrument of the present invention,
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is a cross-sectional view showing a swaged portion of an inner pendulum of another embodiment, and FIG.
5 and 6 are cross-sectional views showing the mounting state of the embodiment shown in FIG.
FIG. 7 is a cross-sectional view showing a mounting state of another embodiment of the present invention, FIG. 7 is a cross-sectional view showing a state in which the amount of protrusion of the center of the writing portion of the small tubular writing instrument of the present invention is determined to a predetermined amount, 8 and 9 are cross-sectional views showing another embodiment of the present invention,
FIG. 10 is a sectional view taken along the line BB of FIG. DESCRIPTION OF SYMBOLS 1 ... Inner pendulum 2 ... Center core 3 ... Outer pendulum 4 ... O-ring 5 ... Spring 6 ... Pen body 7 ... Holder 7A ... Holder 7 of holder 7 8 ... Pen core

Claims (2)

(57) [Claims] 1. A small tube type writing instrument in which a completed pendulum to which a core is fixed is slidably housed in a pen core and a holder provided with a pen body at the tip, and wherein the core protrudes from the pen body. A small tube characterized in that the inner pendulum and the outer pendulum having the fixed core are loosely fitted slidably in the longitudinal direction to form a completed pendulum, and the outer pendulum can be brought into contact with the retaining step of the holder. Writing section of a writing instrument. 2. An inner pendulum to which a core is fixed is loosely fitted to an outer pendulum at a position appropriately rearward from a predetermined position to form a completed pendulum, and the completed pendulum is inserted into a holder having a pen body fixed to a tip thereof.
Furthermore, after attaching the pen core to the holder and incorporating the completed pendulum slidably, the inner pendulum is pressed from the rear and moved forward with respect to the outer pendulum to protrude the center core from the pen body, but the amount of movement is The tip of the pen body is used as a measurement reference plane to measure the amount of protrusion of the center by a displacement sensor, and when the center has protruded a predetermined amount, the pressing of the inner pendulum is released and determined. Manufacturing method of writing section.