JPH0117878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fountain pen with variable character width that allows adjustment of ink output according to changes in character width.

Conventionally, variable width fountain pens have been proposed in which the font width is changed by changing the cutting width of the pen in order to write bold or thin fonts with a single fountain pen.

For example, in Utility Model Publication No. 45-22646, a tongue piece with a protrusion is provided on a pen with a cam groove, the cam groove and the protrusion are fitted, and the tongue piece is slid against the pen to create a cut width. A variable width fountain pen with adjustable character width is shown. However, this attempt has the disadvantage that when the cut is opened to obtain a bold type, the capillary force near the writing point of the pen weakens, making it impossible to guide the ink in the pen core, resulting in ink running out.

The following proposals have been made to prevent ink from running out when the cut is opened. That is, fixing to the pen a tongue spring that forms an ink reservoir communicating with the cutout between the top surface of the pen (U.S. Pat. No. 2,669,970). However, in this attempt, when attempting to obtain fine print by closing the cuts, the ink reservoir is stationary, so excess ink in the ink reservoir oozes out onto the surface of the paper at the writing point, resulting in a narrow character width. It comes with some disadvantages that cannot be avoided. Other drawbacks include: That is, when the ink reservoir tends to close its cut, the tongue spring is compressed and the volume changes to a small value. This leads to ink overflow when changing from bold to fine.

In this way, with conventional variable width fountain pens, when trying to create bold characters, the ink runs out, and when trying to create fine characters, the ink bleeds and overflows, so the character width can only be changed slightly. In reality, a large change in character width, which is a characteristic feature, cannot be expected.

The present invention solves the above-mentioned problems and provides a fountain pen that has an extremely simple structure, but can adjust the ink flow according to changes in character width to achieve large changes in character width, has high assembly accuracy, and is easy to manufacture. This is what we are trying to provide.

That is, the present invention provides: a pen having a cutout, the top surface of which is provided with either a protrusion or a protrusion guide along the center line of the pen; a pen core to which the pen is attached; a pen core to which the pen and the pen core are inserted. A cover; a protrusion or a protrusion guide which is slidably connected to the pen nib cover and is provided along the center line of the tongue, the other of which is engaged with either one of the protrusion or the protrusion guide of the pen; The variable character width fountain pen is equipped with a movable tongue piece that forms a cutting width adjustment cam with the two members, and is characterized by the following features. That is, the cut width adjusting cam is formed between the tongue piece body that slidably connects the tongue piece to the pen core cover and the pen, and the ink reservoir that communicates with the cut piece is formed between the top surface of the pen and the tongue piece body. an ink retaining plate, and a long hole in a direction transverse to the longitudinal direction of the tongue is provided in either the tongue body or the ink retaining plate,
A protrusion provided on either the ink retaining plate or the tongue body is loosely fitted into this elongated hole to connect the tongue body and the ink retaining plate; The distance between the pen center line and the pen center line is smaller than the distance between the side opposite to the writing end side of the pen and the tongue center line or the pen center line.

According to such a configuration, when the tongue moves forward, the opening of the cut and the advance of the ink reservoir are linked. Since the ink in the ink reservoir flows toward the writing point side of the opened cutout, it is possible to obtain a thick character width. When the tongue moves back, the writing point side of the cut tends to close, and the ink reservoir also moves back, making it possible to obtain a thin character width. In other words, since the ink reservoir is set back from the position for bold type, unlike when the ink reservoir is stationary, the ink in the ink reservoir does not ooze directly onto the paper contacting surface of the writing point, but instead flows into the cutout. Since it merges with the ink within the cut, it becomes possible to obtain fine print. Further, since the ink reservoir and the ink retaining portion are set back, the writing point becomes thin and protruding, which has the advantage of making it easier to write.

Furthermore, by providing a protrusion on the ink retaining plate and loosely fitting the protrusion into the long hole in the direction transverse to the longitudinal direction of the tongue body to connect the two, manufacturing errors of the cutting width adjustment cam can be reduced relative to the long hole. This can be absorbed by the play of the protrusions. The same effect can be obtained by providing the long holes in the ink retaining plate and the protrusions in the tongue piece.

As described above, although the fountain pen of the present invention has an extremely simple structure, it is possible to adjust the ink flow according to changes in the width of the character, thereby making it possible to obtain large changes in the width of the character.Moreover, it is easy to manufacture and can improve assembly accuracy.

In the present invention, the ink holding plate forms an ink reservoir between the ink holding plate and the top surface of the pen, and may be either flat in cross section or curved concavely toward the pen. The pen-facing surface of the plate may be roughened or provided with a large number of grooves and small holes to improve ink retention.

When the ink retaining plate and the tongue main body are connected, the ink retaining plate may further be provided with a recessed portion, and the recessed portion may be slidably fitted into a convex portion along the center line of the pen. By fitting in this way, it is possible to suppress the left and right wobbling when the ink retaining plate slides. Use the concave part as a pen,
The same effect can be obtained by providing a convex portion on the ink retaining plate.

Such an ink retaining plate can be made of metal such as stainless steel, or can also be made of plastic.
The surface may be plated to improve ink resistance. The same applies to the tongue body, but it is preferable that the tongue body be imparted with elasticity.

Further, in addition to the cam groove, a protrusion such as a protrusion can also be used as the protrusion guide portion of the present invention. In any case, the cam is formed by engaging with a protrusion forming one of the cutting width adjusting cams.

The above protrusion guide portions may be arranged symmetrically on both sides of the pen or tongue with the center line thereof interposed therebetween. This is advantageous when the pen has two or more cuts, since when the tongue slides, an equal force is applied to the tip forming the cut-forming part.

The tongue piece that is engaged with the pen in this way is slidably connected to the pen core cover, but the pen tip side of this connected tongue piece is formed to be thinner than the thickness of the other part and has elasticity. This is preferable because it does not prevent the pen from bending when writing and makes it easier to see the writing point from diagonally above. In this case, it is preferable to connect it to the outer surface of the pen core cover because this creates a step between the pen core cover and the pen, thereby making it possible to prevent ink from seeping out to the rear of the pen.

This connection may be made by connecting the tongue piece to the pen core cover by making the side of the tongue piece opposite to the pen side into an annular shape forming a circle or an arc. Alternatively, a guide hole located on the axis of the upper surface of the pen may be provided at the pen-side tip of the pen core cover, and a tongue piece may be inserted into this guide hole. Providing the guide hole in this manner is extremely advantageous because it is possible to completely prevent the sliding tongue from swinging from side to side, and no unbalanced force is applied to the tip. One or more guide holes may be provided. Although a groove-shaped guide hole can be used, a tunnel-shaped guide hole that can press the tongue toward the pen side is preferable.

If the side of the tongue opposite to the pen side is formed into a flat plate shape instead of an annular shape, a groove is provided on the extension of the guide hole, and the flat plate part of the tongue piece is slidably fitted into this groove. It is also possible to connect the tongue piece to the pen core cover. It is preferable that the tongue piece slidably connected to the pen core cover as described above be attached with elasticity in the direction of the pen, since this will not affect changes in the volume of the ink reservoir. Changes in the volume of the ink reservoir lead to uneven ink output. Elasticity can be imparted to the tongue by forming the tongue body connected to the ink retaining plate with a curved part and a straight part curved in the direction of the ink retaining plate, or by forming a narrow part in the tongue body, or by forming a narrow part in the tongue body. Alternatively, this can be done by disposing an elastic body between the ink retaining plate and the tongue body so as to be in contact with both.

The pen used in the present invention may be flat or may have a cross section curved concavely toward the pen core. Further, one or more cuts may be provided, and they may be closed or opened in advance. When the tongue slides, in order to avoid deformation of the pen and awkward movement of the tongue, one edge is attached to one or both edges of the pen so that the edge can be elastically compressed and expanded.
It is advantageous to provide one or more incisions.

In the present invention, the tongue can be moved by directly pinching it by hand, but it is also possible to use a rotary ring to move the tongue. To connect the rotating ring and the tongue piece, a moving knob is provided on the tongue piece, a feeding groove is provided on the inner surface of the rotating ring, and the rotating ring is rotatably inserted into the pen core cover, and this feeding groove and the moving knob are fitted. Do it together. Use of such a rotating ring is extremely effective for minutely feeding out the tongue. A spiral groove or a cam groove can be used as the feed groove.

Next, the present invention will be explained with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, the pen 2 has a cross section curved concavely toward the pen core 1 side. As shown in FIG. 3, the pen 2 has one cutout 3 opened in advance, and protrusions 4 arranged on both sides of the pen center line on the upper surface of the pen. Reference numeral 6 indicates a pen point, and reference numeral 14 indicates a cut through which both edges of the pen 2 can be elastically compressed and expanded.

An ink retaining plate 7 is arranged on the upper surface of the pen 2 and is curved concavely toward the pen 2, the tip of which is located behind the pen point 6 and in front of the pen core 1. The ink retaining plate 7 forms an ink reservoir 9 in the form of a capillary space between it and the pen 2 and communicates with the cutout 3, and is connected to the tongue body 8a to form the tongue 8.

The tongue body 8a has a long hole 25 in a direction crossing its center line, and the ink holding plate 7 has a protrusion 26. The protrusion 26 is loosely fitted into the elongated hole 25 to connect the tongue body 8a and the ink retaining plate 7.

The ink holding plate 7 is provided with a cam groove-shaped protrusion guiding portion 10, while the tongue body 8a is provided with a moving knob 11, and a gap 16 is formed between it and the pen 2.
The protrusion guide portions 10 are arranged symmetrically on both sides of the tongue center line, and the distance between the pen point side and the tongue center line is equal to the distance between the pen point side and the tongue center line. The tongue piece 8 is formed with a distance smaller than the distance between the tongue piece 8 and the center line of the tongue piece 8 . The protrusion 4 of the pen 2 is engaged with this protrusion guide portion 10.

Pen core cover 13 with pen 2 and pen core 1 inserted
has a tunnel-shaped guide hole 17 located on the axis of the upper surface of the pen 2 at its tip on the pen side, and has a groove 18 provided on an extension line of the guide hole 17. A flat plate portion 19 of the tongue piece 8 is inserted into the guide hole 17 and the groove 18.
are inserted and fitted, and the tongue piece 8 is slidably connected to the pen core cover 13.

A rotary ring 20 is rotatably inserted into the pen core cover 13, and a spiral groove 21 provided on the inner surface of the rotary ring 20 fits into the knob 11 of the tongue piece 8. 22 indicates a barrel, 23 is located between the rotating ring 20 and the pen core cover 13, and the rotating ring 2
0 indicates a cylindrical packing that is in contact with the inner surface of the barrel 22, and 24 indicates a cylindrical packing located between the barrel 22 and the pen core cover 13 and in contact with both.

When the rotary ring 20 is rotated to move the tongue piece 8 forward, the cut 3 opens due to the action of the cut width adjusting cam formed by the protrusion 4 and the protrusion guide part 10.
An ink holding plate 7 is located on the pen point 6 side. Therefore, the ink in the ink reservoir 9 flows out toward the pen point 6, resulting in a thicker character width. Ink is replenished into the ink reservoir 9 when the capillary force of the ink reservoir 9 changes due to the bending of the pen 2 during writing, whereby the ink in the pen core 1 is replenished through the cutout 3.

When the rotary ring 20 is reversely rotated to move the tongue 8 backward, the cut 3 tends to be closed due to the action of the cut width adjustment cam, and the ink reservoir 9 moves away from the pen point 6. As a result, the ink reservoir is set back from the position for bold type, so the ink in the ink reservoir does not ooze directly onto the paper contact surface of the writing point, but instead flows into the cutout and merges with the ink inside the cutout. Therefore, writing with a narrow character width specified by the cutting width can be obtained.

When the rotary ring 20 is rotated to move the tongue 8 forward and backward, the guide hole 17 prevents the tongue 8 from swinging from side to side, and the tip opens and closes evenly. Also,
The step formed by the pen core cover 13 between the gap 16 of the tongue piece 8 and the pen 2 prevents ink from seeping to the rear of the pen 2.

In addition, since the protrusion 26 of the ink retaining plate 7 is loosely fitted into the long hole 25 of the tongue body 8a, the ink retaining plate 7 can move freely in the direction crossing its center line. The above error, i.e.
Installation errors of the protrusion 4 and placement errors of the protrusion guide portion 10 are absorbed.

FIG. 4 shows a modification of FIG. 1, in which the ink holding plate 7 further has a recess 27, and the recess 27 fits into a projection 28 along the center line of the pen 2. As a result, it is possible to suppress the left and right wobbling of the ink retaining plate 7 when it slides.

FIG. 5 shows a tongue that is attached to the pen core cover with elasticity in the direction of the pen. In FIG. 5, an elastic body 32 is disposed between the ink retaining plate 7 and the tongue main body 8a and comes into contact with both. In this case, the elastic body 32 is either the ink holding plate 7 or the tongue body 8a.
It sticks to either.

FIG. 6 shows a case where the pen tip side of the ink retaining plate 7 is formed thinner than the thickness of the other portion and is imparted with elasticity.

FIG. 7 shows a modification of the notch 14 provided in the pen 2.

As explained above, according to the present invention, an ink holding plate is provided between the tongue and the upper surface of the pen to form an ink reservoir that communicates with the cutout, and the pen writing end side of the protrusion guide and the tongue center line or The distance between the center line of the pen and the pen center line is smaller than the distance between the center line of the tongue on the side opposite to the writing end of the pen or the center line of the pen, so it has an extremely simple structure. It is now possible to provide a fountain pen that can adjust the ink flow according to the change in character width and obtain a large change in character width.Moreover, by fitting the protrusion into the long hole in the direction transverse to the longitudinal direction of the tongue, the ink retaining plate and tongue By combining the main bodies, errors in mounting the protrusions forming the cutting width adjusting cam and errors in the arrangement of the protrusion guide can be absorbed, thereby improving assembly accuracy and facilitating manufacturing.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the fountain pen of the present invention; Fig. 2 is a plan view with the rotating ring removed; Fig. 2 is a vertical sectional view of the fountain pen; Fig. 3 is a plan view with the tongue piece separated; Fig. 4 shows another embodiment, a plan view with the rotary ring removed, Fig. 5 a vertical sectional view showing a modification of the tongue, and Fig. 6 a main part showing a modification of the tip of the tongue. The vertical sectional view and FIG. 7 are plan views showing a modification of the pen. In the figure, 1 is a pen core, 2 is a pen, 3 is a cutout, 4 is a protrusion, 7 is an ink holding plate, 8 is a tongue piece, 8a is a tongue piece body, 9 is an ink reservoir, 10 is a protrusion guide part, 13
indicates a pen core cover, 25 indicates a long hole, and 26 indicates a protrusion.

Claims (1)

[Scope of Claims] 1. A pen having a cutout, the upper surface of which is provided with either a protrusion or a protrusion guide along the center line of the pen; A pen core to which the pen is attached; A pen to which the pen and the pen core are inserted; With the lead cover; the other of the protrusion or the protrusion guide that is slidably connected to the pen core cover and is provided along the center line of the tongue piece is engaged with either the protrusion or the protrusion guide of the pen; A variable width fountain pen is provided with a tongue whose levers form a cutting width adjustment cam; and a tongue body 8a which slidably connects the tongue 8 to the pen core cover 13, and a pen 2. an ink retaining plate 7 which forms the cut width adjustment cam in between and an ink reservoir 9 that communicates with the cut 3 between the top surface of the pen 2 and an elongated hole in the direction transverse to the longitudinal direction of the tongue. 25 is provided on either the tongue body 8a or the ink retaining plate 7, and a protrusion 26 provided on the other of the ink retaining plate 7 or the tongue body 8a is loosely fitted into this elongated hole 25. and the ink retaining plate 7; and the distance between the pen writing end side of the protrusion guide 10 and the tongue center line or the pen center line, and the distance between the pen writing end side of the protrusion guide 10 and the tongue center line. Or, a variable width fountain pen characterized by being smaller than the distance between the pen center line and the pen center line.