JP2006212887A - Writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent clogging due to a precipitable composition contained in ink. <P>SOLUTION: An ink holding chamber having a remarkably smaller capacity than that of an ink chamber is provided, while the ink to be introduced into the ink holding chamber is divided by a valve structure using a churning ball. By this constitution, clogging of an ink introduction path from the ink holding chamber to a penpoint member due to the precipitable composition, as well as an excessive supply of the ink due to the air in the ink chamber, can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a writing instrument, and is particularly suitable for application to a writing instrument that enables writing by supplying ink in an ink chamber to a pen tip member.

  Conventionally, as shown in FIG. 7, as a writing instrument 1, an ink chamber 3 is formed in a rear end portion of a cylindrical pen body 2 whose rear end surface is closed, and ink in the ink chamber 3 is transferred to the front end side of the ink chamber 3. There has been proposed one that supplies to a pen tip member 6 held by a holder 5 at a tip end portion of a pen body 2 via an introduction core 4 provided in the pen core (see Patent Document 1).

  The introduction core 4 has a configuration in which a synthetic resin material is formed into a cylindrical shape, and is held by the support hole 7A of the holding member 7 press-fitted into the pen body 2 with the rear end portion protruding into the ink chamber 3. Yes.

  An ink introduction slit 8 is provided on the center line of the introduction core 4 so as to penetrate from the rear end to the front end, and the ink in the ink chamber 3 is introduced into the pen tip member 6 by the ink introduction slit 8.

  The nib member 6 is made of a porous felt-like material in which fiber layers are stacked and solidified in a cross-sectional shape with a resin, and the ink introduction slit 8 is formed by joining the introduction core 4 so as to protrude from the rear end. Ink introduced from the ink is supplied to the tip of the nib member 6 utilizing capillary action.

  A batting member 9 held by a holding member 7 is disposed around the introduction core 4, and the tip of the batting member 9 is connected so as to cover the rear end portion of the pen tip member 6. When the ink introduced into the tip member 6 becomes excessive, it can be held by infiltrating the excess cotton member 9 with the excess ink.

  In the configuration of FIG. 7, the ink in the ink chamber 3 is supplied to the pen tip member 6 through the ink introduction slit 8 of the introduction core 4, whereby the ink is applied to a writing target such as writing paper that contacts the pen tip member 6. Written.

  In this state, for example, when the air in the ink chamber 3 expands due to the temperature of the hand or the room temperature and the ink is excessively pushed out to the pen tip member 6, the pen tip member 6 is moistened. However, when the ink of the pen tip member 6 is consumed by subsequent writing, the ink stored in the batting member 9 is absorbed due to the greater capillary force of the pen tip member. The ink flowing to the tip member 6 is thereby written on the object to be written by the pen tip member 6.

  As a result, when the ink chamber becomes negative pressure due to consumption of ink, the outside air passes through the capillary at the tip of the pen, and further flows through the ink introduction slit 8 of the introduction core 4 to the ink chamber 3, so that the pressure is reduced. Keep balance.

  On the other hand, when the nib portion 6 is saturated and wet, the nib member 6 does not allow air from the outside to pass therethrough, so that no inflow of air into the ink chamber 3 occurs. There is no leakage from the member 6.

Further, the ink stored in the batting member 9 moves to the pen tip member 6 every time the ink of the pen tip member 6 is consumed, thereby adjusting the amount of air passing through the pen tip member 6. Thus, the balance between the ink holding function of the batting member 9 and the ink outflow function from the ink chamber 3 is ensured.
JP 2000-43467 A

  As the ink filled in the ink chamber 3, ink containing about 10% of fine particles may be used. In this case, if the writing operation by the writing instrument 1 is stopped or stored, the fine particles will be removed. A phenomenon of precipitation (this fine particle is called a precipitable composition) occurs.

  Conventionally, as a countermeasure, for example, a stainless steel stirring ball 10 is placed in the ink chamber 3, and the stirring ball 10 is randomly stirred by shaking the writing tool 1 before the user performs a writing operation. A configuration is adopted in which the precipitated composition is dispersed in the ink to supply the ink to the pen tip member via the introduction core 4.

  However, when the precipitating composition is contained in the ink as described above, when the writing instrument 1 is stored for a long time with the nib member 6 facing downward, the ink in the ink chamber 3 is introduced into the lead core. When the precipitating composition is clogged while it is introduced into the ink introduction slit 8 and is stagnating, it may be impossible to introduce ink from the ink chamber 3 to the pen tip member 6.

  Further, according to the configuration of FIG. 7, when the consumption of ink in the ink chamber 3 progresses and the air in the ink chamber 3 increases, the air in the ink chamber 3 depends on the room temperature or hand temperature when the writing instrument 1 is used. Is expanded from the ink chamber 3 through the introduction core 4 to the pen tip member 6 at a speed greater than the speed absorbed by the batting member 9, and as a result, the amount of ink in the pen tip member 6 is excessive. Thus, the writing line density may not be kept constant.

  The present invention has been made in consideration of the above points, and effectively avoids the possibility of clogging due to the ink precipitating composition and the change in writing line density due to the change in the amount of ink extruded from the ink chamber. I would like to propose a writing instrument designed to do this.

  In order to solve such a problem, in the present invention, ink containing a precipitating composition filled in the ink chambers 3 and 38 formed at the rear ends of the cylindrical pen bodies 2 and 32 is supplied to the pen body 2 via the ink introduction part. In the writing instruments 21 and 31 to be supplied to the pen tip members 6 and 34 provided at the tip end portions of 32, 32, the stirring balls 23 and 39 placed in the ink chambers 3 and 38, the ink chambers 3 and 38, and the ink introduction unit The valve seats 22D and 37 are formed between the valve seats 22D and 37 for introducing the ink in the ink chambers 3 and 38 through the introduction holes, and have a volume much smaller than the volumes of the ink chambers 3 and 38, and are introduced through the introduction holes. Ink holding chambers 23E and 40 for holding the ink and supplying the held ink to the pen tip members 6 and 34 are provided. The stirring balls 23 and 39 abut against the valve seats 22D and 37 so as to block the introduction holes. Ink retention when touching 22E and 40 are not in communication with the ink chambers 3 and 38, but when the stirring balls 23 and 39 are separated from the valve seat portions 22D and 37, the ink holding chambers 22E and 40 are moved to the ink chambers 3 and 38 each time. The ink in the ink chambers 3 and 38 is taken into the ink holding chambers 22E and 40 little by little.

  By providing an ink holding chamber having a volume significantly smaller than the volume of the ink chamber and partitioning the ink holding chamber by a valve structure using a stirring ball, an ink introduction path from the ink holding chamber to the pen tip member In addition, clogging due to the precipitating composition and excessive supply of ink due to air in the ink chamber can be prevented.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment FIG. 1 shows a first embodiment of the present invention, and parts corresponding to those in FIG. ing.

  The writing tool 21 passes the ink in the ink chamber 3 provided at the rear end side portion of the cylindrical pen body 2 to the front end portion of the pen body 2 through the ink introduction slit 8 of the introduction core 4 constituting the ink introduction portion. The ink is introduced into the pen tip member 6 held by the holder 5.

  Also in this case, a feeding member 9 that is in contact with the rear end portion of the pen tip member 6 is provided around the introduction core 4 so that the pen tip member 6 is supplied in the same manner as described above with reference to FIG. The ink amount to be adjusted is adjusted.

  A cylindrical partition member 22 is fitted in the inner space on the front end side of the pen body 2.

  As shown in FIG. 2, the partition member 22 has a cylindrical portion 22A on the front end side, and the rear end opening of the cylindrical portion 22A is closed by a closing plate portion 22B.

  A conical recess space 22C is formed in the rear end surface of the closing plate portion 22B so as to open rearward, and a valve seat portion 22D is formed by the frustoconical periphery of the recess space 22C.

  Thus, the valve member 22D has the inclined surface 22D1 having a truncated cone surface shape that inclines in the direction of the ink chamber 3 from the center line of the pen body 2 in the radial direction, and has a circular inlet 22D2 at the center line position. Have

  The inlet 22D2 of the valve seat portion 22D is connected to an ink holding chamber 22E having a cylindrical inner surface, and an introduction core holding hole 22F extending along the center line from the cylindrical portion 22A is formed at the front end of the ink holding chamber 22E. Thus, when the introduction core 4 is inserted into the cylindrical portion 22A from the front end on the center line, the introduction core 4 is held by the introduction core holding hole 22F so that the rear end face protrudes into the ink holding chamber 22E.

  The partition member 22 having such a configuration is positioned so that the valve seat portion 22D of the closing plate portion 22B is positioned at a substantially center line position of the pen body 2 by being fitted into the internal space of the pen body 2 from the tip.

  Thus, the ink chamber 3 is formed in the substantially second half space of the valve seat portion 22D in the internal space of the pen body 2, and the ink holding chamber 22E is connected to the ink chamber via the inlet 22D2 at the center position of the valve seat portion 22D. 3 communicates.

  In the above configuration, two stirring balls 23 are placed in the ink chamber 3, and the pen body 2 has its center line 2A oriented in the vertical direction or the vicinity thereof as shown in FIG. When written or stored in such a state that 6 is directed downward, either one of the stirring balls 23 in the ink chamber 3 comes into contact with the valve seat 22D of the partition member 22.

  At this time, since the stirring ball 23 is spherical and the inclined surface 22D1 of the valve seat portion 22D has a truncated cone shape, the valve seat portion so that the stirring ball 23 closes the ink holding chamber 22E at the center line position of the pen body 2. It will be in the state which contacts the surface of 22D.

  As a result, the ink holding chamber 22E cannot communicate with the ink chamber 3 by the stirring ball 23, and as a result, a much smaller amount of ink is separated from the ink chamber 3 in the ink holding chamber 22E than the volume of the ink chamber 3. It will be kept.

  In the case of this embodiment, the pen body 2 is selected to have a thickness of about 15 [mmφ] and a length of about 145 [mm], so that the ink chamber 3 has a volume of about 6 to 7 [cc]. The opening angle θ of the inclined surface 22D1 of the valve seat portion 22D is selected from θ = 60 ° to 120 °, and the stirring ball 23 has a diameter of 5 to 8 [mm] and a weight of 1 to 2 [g]. In this way, the inlet 22D2 is reliably closed by the stirring ball 23.

  Therefore, even when the ink in the ink chamber 3 contains a precipitating composition, the precipitating composition held in the ink holding chamber 22E is also separated from the precipitating composition in the ink chamber 3. The amount becomes small.

  Here, the volume of the ink holding chamber 22E formed by the stirring sphere 23 is selected to be about 0.1 to 0.5 [cc], whereby the ratio of about 3 to 10 [%] with respect to the volume of the ink chamber 3 is selected. Then, when the writing instrument 21 is operated for writing, the ink containing the precipitating composition is introduced from the ink holding chamber 22E into the pen tip member 6 through the ink introduction slit 8 of the introduction core 4 that forms the introduction portion. Since the precipitating composition cut into the holding chamber 22E is also a small amount, almost the entire amount is supplied together with the ink to the pen tip member 6 through the ink introduction slit 8, and is absorbed and dispersed in the pen tip member 6. .

  For example, if the writing amount to be written on a writing object by one writing operation is 1 [m] × 4 [mm], the consumed ink amount is around 0.02 [cc], and this consumption If the amount of ink cut into the ink holding chamber 22E from about the amount is about 0.1 to 0.5 [cc], the ink of the introduction core 4 that forms the introduction portion of the precipitating composition contained in the ink without inconvenience in writing. It is possible to prevent the clogging of the introduction slit 8 from being practically sufficient.

  In addition to this, the ink holding chamber 22E is separated from the ink chamber 3 by the valve seat portion 22D and the stirring ball 23, so that the air in the ink chamber 3 increases and the air is warmed at the hand temperature or the room temperature. Even if the pushing pressure against the ink increases due to the expansion, it can be prevented from being transmitted to the ink holding chamber 22E by the valve closing function of the valve seat portion 22D and the stirring ball 23.

  Accordingly, in this case as well, excessive ink supply to the pen tip member 6 can be prevented.

  According to the above configuration, the ink introduced into the pen tip member 6 is separated from the large-volume ink chamber 3 into the remarkably small-volume ink holding chamber 22E by the valve seat portion 22D and the stirring ball 23. The precipitating composition contained in the ink is clogged in the ink supply path leading to the pen tip member 6, and ink leakage of the pen tip member 6 due to temperature expansion can be effectively prevented.

  In the case of the above-described embodiment, by using two stirring balls 23, as shown in FIG. 4, even when stored in a storage state in which the center line 2A of the pen body 2 is inclined, One of the stirring spheres 23 pushes up the other stirring sphere 23 by its own gravity so that the other stirring sphere 23 is pressed against the valve seat portion 22D, so that the valve closing function can be sufficiently realized in practice.

(2) Second Embodiment FIG. 5 shows a second embodiment, and the writing instrument 31 in this case constitutes an ink supply valve at the tip of the cylindrical pen body 32 with the rear end face closed. A valve storage part 33 is provided.

  The valve storage portion 33 has a cylindrical support member 33A fitted from the tip into the internal space of the pen body 32, and the valve core member 33C is inserted into the internal space from the tip by the valve cylinder member 33B. It is held so that it can slide along the center line.

  An annular flange 33D is provided at substantially the center position in the length direction of the valve core member 33C so as to protrude in the oblique rear end direction, and the inner surface of the rear end portion of the valve cylinder member 33B is opposed to the flange 33D. A valve seat 33E is formed on the top.

  The columnar rear end portion 33F of the valve core member 33C is slidably held by a support projection 33G protruding in the center direction from the inner wall surface of the support member 33A, and is provided between the flange 33D and the support projection 33G. The string spring 33H is slidably biased toward the distal end.

  Thus, the valve core member 33C is slidingly biased to the sliding position on the distal end side by the elastic force of the coiled spring 33H, so that the flange 33D contacts the valve seat 33E and maintains the closed state.

  An attachment hole 33I is formed in the distal end surface of the valve core member 33C, and the rear end portion of the rod-shaped nib member 34 is fitted into the attachment hole 33I, so that the nib member 34 is connected to the valve core member 33C. The pen body 32 can be slid along the center line.

  A holder 35 is fitted into the tip of the pen body 32, and a pen tip member 34 is slidably held by a support hole 35A provided at the tip.

  In addition to the above configuration, a truncated conical recess space 36 is formed on the rear end surface of the support member 33A so as to open in the rear end direction, and the rear end surface of the support member 33A is formed at the peripheral edge of the recess space 36. A valve seat portion 37 is formed so as to be inclined rearward of the front end as it goes in the center direction and to be connected to the inner wall surface 33J of the support member 33A.

  An ink chamber 38 is formed in the rear end portion of the internal space of the pen body 32, and a plurality of, for example, two stirring balls 39 are placed in the ink chamber 38, and one of the stirring balls 39 is a valve seat portion 37. When the stirring ball 39 is away from the inclined surface 37A of the valve seat 37, the ink chamber 38 acts as a valve for the ink of the ink chamber 38 by contacting the inclined surface 37A of the valve seat 37 at the center hole position. Ink flows into the internal space of the support member 33A through the central opening of the valve seat portion 37, while the stirring ball 39 comes into contact with the inclined surface of the valve seat portion 37, the inside of the support member 33A. By separating the space from the ink chamber 38, the ink holding chamber 40 is configured to separate and hold the ink in the internal space of the support member 33A from the ink in the ink chamber 38.

  In the case of this embodiment, the ink cut into the ink holding chamber 40 is supplied with an ink introduction in which a string spring 33H is provided through a fan-shaped introduction hole 33K formed between the support protrusions 33G as shown in FIG. Introduced into space.

  The ink introduced into the ink introduction space is in a closed state because the valve core rod member 33C slides to the position in the distal direction by the elastic force of the string spring 33H, so that the collar 33D contacts the valve seat 33E. At this time, the ink is held in the ink holding chamber 40 formed in the space surrounded by the inner wall surface 33J of the support member 33A.

  On the other hand, when the nib member 34 is pushed into the holder 35 against the elastic force of the string spring 33H and the collar 33D is in a valve open state separated from the valve seat 33E, it is held in the ink holding chamber 40. The discharged ink flows around the pen tip member 34.

  An ink holding ring 41 made of a sponge material is provided around the pen tip member 34, and the ink flowing out between the valve seat 33E and the ridge 33D is sucked and held by the ink holding ring 41, and the held ink Is supplied to the object to be written using the capillary force of the nib member 34.

  In the above configuration, in the same manner as described above with reference to FIG. 3 and FIG. Any one of them is in contact with the center hole of the inclined surface 37A of the valve seat portion 37 by its own weight, and thus the valve is closed.

  In the case of this embodiment, the opening angle θ of the valve seat portion 37 is selected to be θ = 90 ° to 120 °, so that the operation of closing the central opening of the valve seat portion 37 by the stirring ball 39 is practically sufficient. None got.

  At this time, the ink in the ink holding chamber 40 formed in the internal space of the support member 33A is separated from the ink in the ink chamber 38 by a small amount. The separated ink is used as a writing paper by the pen tip member 34 or the like. The flange 33D of the valve core rod member 33C is separated from the valve seat 33E each time it is pressed against the object to be written, so that it is supplied from the ink holding chamber 40 to the ink holding ring 41.

  Thus, the writing tool 31 can be written by the nib member 34.

  At this time, since the amount of the precipitable composition contained in the ink in the ink chamber 38 is cut and taken into the ink holding chamber 40 is small, it is supplied to the ink holding ring 41 from the valve seat 33E and the ridge 33D. The ink is supplied to the ink holding ring 41 together with the ink.

  Accordingly, since a large amount of the precipitating composition does not remain in the small-volume ink holding chamber 40, it is possible to avoid the possibility that the precipitating composition will clog the valve storage portion 33 after all.

  In addition to this, the amount of air in the ink chamber 38 increases and the air in the ink chamber 38 expands due to the temperature or room temperature of the user's hand, so that the ink in the ink chamber 38 is pushed out to the valve storage portion 33. Even so, the ink can be prevented from being introduced into the ink holding chamber 40 by the valve closing function of the stirring ball 39 and the valve seat portion 37, so that excess ink can enter the ink holding ring 41 through the valve storage portion 33. It is possible to effectively avoid the possibility of ink dripping due to outflow.

  According to experiments, it has been found that if the volume of the ink holding chamber 40 is selected to be about 0.2 to 0.6 [cc], clogging of the precipitating composition and excessive ink outflow can be effectively prevented.

  According to the above configuration, the ink is separated into the small-capacity ink holding chamber 40 by the valve function of the valve seat portion 37 and the stirring ball 39 with respect to the large-volume ink in the ink chamber 38. The precipitating composition contained can effectively prevent clogging of the ink introduction part and excessive ink supply due to expansion of air in the ink chamber 38.

(3) Other Embodiments In the above-described embodiment, the case where two stirring balls are put in the ink chamber 38 has been described. The same effect as the case can be obtained.

  The present invention can be used for a writing instrument using an ink containing a precipitable composition.

It is a longitudinal cross-sectional view which shows 1st Embodiment of the writing instrument by this invention. It is a longitudinal cross-sectional view which shows the detailed structure of the partition member 22 of FIG. It is a partial longitudinal cross-sectional view with which it uses for description of the vertical use state of a writing instrument. It is a partial longitudinal cross-sectional view with which it uses for description of the diagonal use condition of a writing instrument. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the writing instrument by this invention. It is sectional drawing which shows the detailed structure of the valve storage part 33 of FIG. It is a longitudinal cross-sectional view which shows the structure of the conventional writing instrument.

Explanation of symbols

1,21,31 ... writing instrument, 2,32 ... pen body, 3,38 ... ink chamber, 4 ... introducing core, 5,35 ... holder, 6,34 ... pen nib member, 7 ... Holding member, 8 ... Ink introduction slit, 9 ... Filling member, 10, 23, 39 ... Stirring ball, 22 ... Partition member, 22A ... Cylindrical part, 22B ... Closure plate part, 22C, 36 ... Recessed space, 22D: Valve seat, 22E, 40: Ink holding chamber, 22F: Introducing core holding hole, 33: Valve housing, 33A: Support member, 33B: Valve cylinder member, 33C ... Valve core member, 33D ... 鍔, 33E ... Valve seat, 33F ... Rear end, 33G ... Support projection, 33H ... String spring, 33I ... Mounting hole, 33J ... Inner wall surface, 33K ... Introducing port, 35A ... support hole, 37 ... valve seat.

Claims (2)

In a writing instrument that supplies ink containing a precipitating composition filled in an ink chamber formed at a rear end portion of a cylindrical pen body to a pen tip member provided at a front end portion of the pen body through an ink introduction portion,
A stirring ball placed in the ink chamber;
A valve seat portion formed between the ink chamber and the ink introduction portion and introducing ink in the ink chamber through the introduction hole;
An ink holding chamber having a volume that is significantly smaller than the volume of the ink chamber, holding the ink introduced through the introduction hole, and supplying the held ink to the pen nib member; When the agitating sphere is separated from the valve seat portion, the ink holding chamber is not in communication with the ink chamber when the valve contacts the valve seat portion so as to close the introduction port. A writing instrument, wherein the ink holding chamber communicates with the ink chamber so that the ink in the ink chamber is taken into the ink holding chamber little by little. The surface of the valve seat has a truncated cone shape that inclines in the direction of the ink chamber as it goes in the radial direction from the center line of the pen body, and is connected to the introduction hole at the center line position, 2. The writing instrument according to claim 1, wherein when the sphere contacts the valve seat portion so as to block the introduction hole, the ink holding chamber is partitioned by the contact portion so as not to communicate with the ink chamber. .

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