JP4847147B2 - Direct liquid writing instrument - Google Patents

Description

The present invention relates to a direct liquid writing instrument that directly fills an ink tank with ink.
Specifically, an ink tank, an ink retaining portion that temporarily retains ink that enters and exits from the ink tank, a partition that partitions the ink tank and the ink retaining portion, and a central portion of the partition are disposed inside the shaft cylinder. The present invention relates to a direct liquid-type writing instrument provided with a core for supplying ink from an ink tank to the tip writing unit.

Conventionally, as a direct liquid type writing instrument of this type, the shape of the through-hole opened at the center of the partition wall is a regular square, regular hexagon, or regular octagon, and each side of these through-holes and a core with a circular cross section (ink When the internal pressure of the ink tank (ink storage chamber) rises due to temperature rise or the like by inserting the core with two or more locations in contact with the supply body), the ink is transferred to the ink holding portion (reservoir chamber) In addition to preventing leakage of ink to the outside due to outflow, and when the internal pressure of the ink tank decreases due to a decrease in ink, air is taken into the ink tank to avoid a decrease in ink discharge amount. There is one in which a liquid circulation action (gas-liquid exchange action) can be obtained (for example, see Patent Document 1).
In addition, a proximity portion is formed at each corner portion of the polygonal through hole so as to reduce the distance from the outer periphery of the core, or a circular core with a circular cross section is inserted into the elliptical through hole. Then, the center of the core is positioned by abutting at two opposing positions, or conversely, the center of the polygonal or elliptical cross section is inserted through the circular through hole, It is also described that a rib is formed in the through hole so as to come into contact with the outer periphery of the core at a predetermined interval so that the gap between the through hole and the core is constant.

However, according to such a conventional direct liquid type writing instrument, since the through-hole opened in the partition wall and the center core are positioned by point contact, the center position shift occurs in the two-point support. If the number of point contact points is three or more, the support structure becomes complicated and the cost increases, and the width of the gap gradually decreases toward these point contact parts. In addition to ink adhering to the surface due to surface tension and air bubbles being easily clogged, the fibers are peeled off from the bundle of fibers that make up the core, and fine fibers such as lint and dust mixed in during manufacturing. There is also a problem that dust is also attached and easily clogged, and as a result, a stable gas-liquid circulation action cannot be obtained.
International Publication No. 2004/000575 (Page 4-5, Fig. 2-3)

  The present invention has been made in view of the above-described conventional circumstances, and the object of the present invention is to provide a direct liquid-type writing instrument that can obtain a stable gas-liquid circulation action even if an error occurs in dimensional error or assembly accuracy. It is in.

Means for solving the above problems include an ink tank (2) inside the shaft tube (1), an ink holding part (3) for temporarily holding ink entering and leaving the ink tank (2), Ink is passed from the ink tank (2) to the tip writing part (6) through the partition wall (4) partitioning the ink tank (2) and the ink retaining part (3) and through the central part of the partition wall (4). In the direct liquid type writing instrument provided with the supplying core (5), the partition wall (4) has through holes (4b, 4b ′, 4b ″) which are spaces of the same width dimension in the circumferential direction thereof, Support portions (4c, 4c ') that are in surface contact with the outer peripheral surface (5a) of the core (5) in the circumferential direction, and an ink guide path (7) for guiding ink remaining in the ink tank (2). The ink guide path (7) is provided on the ink tank (2) side of the partition wall (4). The face, the through-holes (4b, 4b ', 4b " ) , characterized in that by forming a groove leading to.

The present invention has the following effects by the above configuration.
According to the first invention, the partition wall is provided with a through hole that is a space having the same width dimension in the circumferential direction and a support portion that is in surface contact with the outer circumferential surface of the core in the circumferential direction. The support core is positioned so that the inner core cannot be moved in the radial direction by the support portion, and the through hole does not have a narrow gap portion to which ink or bubbles adhere or fine dust is easily clogged.
Therefore, a stable gas-liquid circulation operation can be obtained even if a dimensional error or an assembly accuracy error occurs.
Therefore, compared to the conventional technology in which the through hole opened in the partition wall and the center core are positioned by point contact, the width of the gap does not gradually narrow in the circumferential direction, so ink, bubbles, fine dust, etc. are attached. Therefore, a stable gas-liquid circulation action can be obtained without clogging.
In addition, by forming an ink guide path in the partition wall for guiding the ink remaining in the ink tank to the core, the remaining ink becomes a granular form dispersed by surface tension as the ink in the ink tank decreases. Also, they are guided along the ink guide path to the core.
Therefore, the last drop of ink can be used for writing.
Therefore, there is no waste of ink and it is economical.

  As shown in FIGS. 1 to 6, the direct liquid writing instrument A of the present invention includes an ink tank 2 in which liquid ink is stored inside a cylindrical tube 1 formed in a cylindrical shape, and the inside of the ink tank 2. An ink retaining portion 3 that temporarily retains ink that enters and exits in response to temperature changes and pressure changes, a partition wall 4 that partitions the ink tank 2 and the ink retaining portion 3, and a central portion of the partition wall 4 in the axial direction And a core 5 inserted through the ink tank 2 and the ink retaining portion 3. The front end of the core 5 is connected to a tip writing portion 6 provided at the front end of the shaft tube 1. .

As a preferred example of the ink retaining portion 3, a core loading hole portion 3a through which a core 5 described later is inserted as disclosed in, for example, Japanese Patent Laid-Open No. 9-323496, and the outside of the core loading hole portion 3a. A plurality of disk-like comb teeth 3b provided at appropriate intervals in the axial direction, ink storage grooves 3c formed between the comb teeth 3b, and the comb teeth 3b are formed in the axial direction. The ink guide slit 3d and the ink guide slit 3d include an air passage 3e that is formed in the axial direction at the tip of the comb tooth 3b.
In addition, as another example, a structure other than the illustrated example can be used as long as it has the same function.

  The partition wall 4 is formed in a direction orthogonal to the axial direction of the shaft tube 1, and an ink tank 2 is formed in the rear side of the shaft tube 1, and an ink retaining portion 3 is formed in the front portion. Has a central hole 4a for penetrating a core 5 to be described later, and in addition, a through hole 4b for allowing ink or air to enter and exit the ink tank 2 and the ink holding part 3 is opened. Is done.

  The gap between the ink tank 2 and the ink retaining portion 3 by the through-hole 4b is in a state in which ink is retained by capillary force to form an ink film (seal), and the pressure in the ink tank 2 is increased or the pressure is increased. Along with the decrease, the ink film of the through-hole 4b is broken, and a gas-liquid circulation action such as ink flowing out to the ink holding part 3 or air flowing into the ink holding part 3 can be obtained. .

The inner core 5 supplies ink from the ink tank 2 to the tip writing unit 6 by its capillary force, such as a porous rod-like body obtained by converging and compressing a large number of fibers parallel to the axial direction.
As a preferred example thereof, the inner core 5 is passed through the central hole 4a of the partition wall 4, and the outer peripheral surface 5a formed in a circular cross section with respect to the central hole 4a or a support portion 4c described later. The wall surface is brought into surface contact so as to be immovable in the radial direction, and the rear end portion 5b of the core 5 is appropriately projected into the ink tank 2 so that the front end portion 5c is connected to the tip writing portion 6. ing.

As a preferred example of the tip writing portion 6, an ink introduction tube 6a that is joined to the front end portion 5c of the core 5 as disclosed in, for example, Japanese Patent Laid-Open No. 9-323496, and the front end is gripped rotatably. The inner diameter of the ink introduction tube 6a is made smaller, and the capillary force acting on the ball 6b is made stronger than the capillary force of the middle core 5, so that the ink from the middle core 5 is transferred to the ink introduction tube 6a. Then, the ball 6b is supplied.
In addition, as another example, a structure other than the illustrated example can be used as long as it has the same function.

The partition wall 4 is provided with a through hole 4b having the same width dimension in the circumferential direction and a support portion 4c in surface contact with the outer circumferential surface 5a of the core 5 in the circumferential direction.
Furthermore, the outer peripheral surface 5a is larger in diameter than the outer peripheral surface 5a of the core 5 and has the same width along the outer peripheral surface 5a in the circumferential direction, and partially protrudes toward the outer peripheral surface 5a of the core 5. It is preferable that a plurality of support portions 4c that are in surface contact with 5a are alternately arranged in the circumferential direction, and the core 5 is supported by these support portions 4c so that the center core 5 cannot be displaced in the radial direction.

  Further, it is preferable to form an ink guide path 7 for guiding the ink remaining in the ink tank 2 to the core 5 in one or both of the partition wall 4 and the ink tank 2. Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the first embodiment includes a through hole 4 b having the same width in the circumferential direction along the outer peripheral surface 5 a of the center core 5, and the outer periphery of the center core 5. By arranging two support portions 4c that protrude toward the surface 5a and come into surface contact with each other alternately in the circumferential direction, the core 5 is supported at two points, and the ink guide path 7 is formed only in the partition wall 4. The case where it was done is shown.

  In the illustrated example, the ink guide path 7 is formed only on the surface of the partition wall 4 on the ink tank 2 side, and is a groove 7a that communicates with the inner peripheral surface 2a of the ink tank 2 from the outer edge of the partition wall 4 to the through hole 4b. 2 are respectively recessed in a substantially straight line in the radial direction, so that the ink particles separated by the surface tension remain on the inner peripheral surface 2 a, the partition wall 4, and the corners of the ink tank 2 away from the core 5. However, it is guided to the through hole 4b along the concave groove 7a.

As another example of the ink guide path 7, although not shown, the two concave grooves 7a are arranged so as to have a shape other than a substantially straight line, or only one or three or more concave grooves 7a are provided. In place of or in addition to these concave grooves 7a, one or a plurality of protrusions 7b such as ribs leading from the outer edge of the partition wall 4 to the outer peripheral surface 5a of the core 5 or the through hole 4b are provided as shown by a two-dot chain line in FIG. It is also possible.
Further, although not shown, in order to return the ink retained in the ink retaining portion 3 to the outer peripheral surface 5a of the ink tank 2 or the core 5, a concave groove of the ink guide path 7 or the back surface of the partition wall 4 on the ink retaining portion 3 side is provided. It is also possible to form protrusions.

Next, the effect of the direct liquid writing instrument A will be described.
First, as shown in FIG. 2, since the support portion 4c is brought into surface contact with the outer peripheral surface 5a of the core 5, the center core 5 is positioned so as to be immovable in the radial direction even by two-point support by the support portion 4c. The gap between the outer peripheral surface 5a of the core 5 and the through hole 4b is kept constant.

At the same time, ink or bubbles adhere to the through-holes 4b having the same width dimension in the circumferential direction along the outer peripheral surface 5a of the core 5 or fibers that are peeled off from the fiber bundle constituting the core 5 In addition, there is no narrow gap portion that is likely to be clogged with fine dust such as lint and dust mixed during manufacture.
As a result, the center hole 4a and the through hole 4b of the partition wall 4 and the core 5 are stable between the through hole 4b and the outer peripheral surface 5a of the core 5 even if there is some error in the dimensional error or assembly accuracy. A gap dimension is obtained.

Further, in the case where the ink guide path 7 for guiding the ink remaining in the ink tank 2 to the core 5 is formed in one or both of the partition wall 4 and the ink tank 2, the inside of the ink tank 2 is written. As the ink decreases, even if the remaining ink is dispersed in the form of particles due to the surface tension, the ink is guided along the ink guide path 7 to the core 5.
As a result, there is an advantage that even the last drop of ink remaining in the ink tank 2 can be used for writing.

  In the second embodiment, as shown in FIG. 3, a through hole 4b having the same width in the circumferential direction along the outer peripheral surface 5a of the core 5 and a support portion 4c in surface contact with the outer peripheral surface 5a of the core 5 are provided. Although the two cores 5 are alternately arranged in the circumferential direction to support the central core 5 at two points, the ink guide path 7 is not provided in the partition wall 4 in the first embodiment shown in FIGS. The other configurations are the same as those of the first embodiment.

  As a result, the second embodiment shown in FIG. 3 also has the advantage that a stable gap dimension can be obtained even if a dimensional error or an error in assembly accuracy occurs, as in the first embodiment.

  In the third embodiment, as shown in FIG. 4, the configuration in which the ink guide path 7 is formed along the inner peripheral surface 2a of the partition wall 4 and the ink tank 2 is the same as that of the first embodiment shown in FIGS. The other configurations are the same as those of the first embodiment.

In the illustrated example, the recessed only one set groove 7c in the radial direction toward the along the inner circumferential surface 2a of the partition wall 4 and the ink tank 2 communicating with the through-hole 4b.
Although not shown as another example, the ink tank 2 is provided with a plurality of the concave grooves 7c at appropriate intervals in the circumferential direction, or in place of or in addition to the concave grooves 7cg, as indicated by a two-dot chain line in FIG. One or a plurality of protrusions 7d such as ribs are provided from the inner peripheral surface 2a to the through hole 4b or the outer peripheral surface 5a of the core 5, or the concave groove of the ink guide path 7 is formed on the back surface of the ink retaining portion 3 of the partition wall 4. Alternatively, protrusions can be formed.

  As a result, in the third embodiment shown in FIG. 4, as in the first embodiment described above, a stable gap dimension can be obtained even if a dimensional error or an error in assembly accuracy occurs, and the inner peripheral surface 2a of the ink tank 2 can be obtained. The ink particles remaining in the ink can be guided to the core 5 and can be used for writing up to the last drop of ink.

  In the fourth embodiment, as shown in FIG. 5, the entire inner peripheral surface of the central hole 4 a of the partition wall 4 is a support portion 4 c ′ in surface contact with the outer peripheral surface 5 a of the core 5, and along the outer edge of the partition wall 4. A configuration in which a plurality of through holes 4b 'having the same width in the circumferential direction are opened at appropriate intervals in the circumferential direction, and the ink guide path 7 is formed only in the partition wall 4 is shown in FIGS. Unlike the first embodiment, the other configuration is the same as that of the first embodiment.

In the illustrated example, the ink guide path 7 is provided only on the surface of the partition wall 4 on the ink tank 2 side, and the two concave grooves 7e leading from the through-hole 4b 'on the outer edge of the partition wall 4 to the center hole 4a are substantially straight in the radial direction. Is recessed.
Although not shown as another example, two grooves 7e are provided in one or three or more so as to have a shape other than a substantially straight line, or in place of or in addition to the grooves 7e, two grooves are shown in FIG. As shown by the dotted line, one or a plurality of protrusions 7f such as ribs are provided from the outer edge of the partition wall 4 or the through hole 4b 'to the outer peripheral surface 5a of the core 5, or the back surface of the partition wall 4 on the ink retaining portion 3 side and the ink. It is also possible to form a concave groove or protrusion of the ink guide path 7 on the inner peripheral surface 2 a of the tank 2.

  As a result, in the fourth embodiment shown in FIG. 5, as in the first embodiment described above, a stable gap dimension can be obtained even if a dimensional error or an assembly accuracy error occurs, and the last drop of ink can be used for writing. There is an advantage.

  In the fifth embodiment, as shown in FIG. 6, the entire inner peripheral surface of the center hole 4 a of the partition wall 4 is a support portion 4 c ′ in surface contact with the outer peripheral surface 5 a of the core 5. A configuration in which a plurality of through-holes 4b ″ having the same width in the circumferential direction are opened at appropriate intervals in the circumferential direction and the ink guide path 7 is formed only in the partition wall 4 is shown in FIGS. Unlike the first embodiment, the other configuration is the same as that of the first embodiment.

In the illustrated example, the ink guide path 7 is provided only on the surface of the partition wall 4 on the ink tank 2 side, and two concave grooves 7g that lead from the outer edge of the partition wall 4 to the center hole 4a through the through-hole 4b ″ are approximately in the radial direction. Concave on a straight line.
Although not shown in the drawings as another example, only two or three grooves 7g are provided so as to have a shape other than a substantially straight line, or instead of or in addition to the grooves 7g, two grooves are formed in FIG. As shown by the dotted line, one or more protrusions 7 h such as ribs are provided from the outer edge of the partition wall 4 to the outer peripheral surface 5 a or the through hole 4 b ″ of the core 5, It is also possible to form a concave groove or protrusion of the ink guide path 7 on the inner peripheral surface 2 a of the tank 2.

  As a result, in the fifth embodiment shown in FIG. 6, as in the first embodiment described above, a stable gap size can be obtained even if a dimensional error or an assembly accuracy error occurs, and the last drop of ink can be used for writing. There is an advantage.

  In the illustrated example, only one partition wall 4 having a central core 5 penetrating through holes 4b, 4b 'and 4b "is provided inside the shaft tube 1 so that ink can be drawn from one ink tank 2. Although supplied by the core 5, the present invention is not limited to this, and a plurality of partition walls 4 through which the center core 5 penetrates and through-holes 4 b, 4 b ′, 4 b ″ are opened are arranged in the axial direction, and ink is interposed between them. A plurality of tanks 2 may be formed in the axial direction.

It is a vertical front view which shows Example 1 of the direct liquid type writing instrument of this invention. FIG. 2 is an enlarged cross-sectional plan view taken along line (2)-(2) in FIG. 1. It is an expansion cross-sectional top view which shows Example 2 of the direct liquid type writing instrument of this invention. It is a vertical front view which shows Example 3 of the direct liquid type writing instrument of this invention. It is an expansion cross-sectional top view which shows Example 4 of the direct liquid type writing instrument of this invention. It is an expansion cross-sectional top view which shows Example 5 of the direct liquid type writing instrument of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ink tank 3 Ink storage part 4 Partition 4b, 4b ', 4b "Through-hole 4c Support part 5 Center core 6 Tip writing part 7 Ink guide path

Claims (4)

Inside the shaft cylinder (1), an ink tank (2), an ink retaining part (3) for temporarily retaining ink entering and exiting from the ink tank (2), the ink tank (2) and the ink retaining part A partition wall (4) that divides (3), and a core (5) that passes through a central portion of the partition wall (4) and supplies ink from the ink tank (2) to the tip writing section (6). In direct liquid writing instruments,
The partition wall (4) extends in the circumferential direction with respect to the through holes (4b, 4b ′, 4b ″) which are spaces of the same width dimension in the circumferential direction and the outer peripheral surface (5a) of the core (5). Supporting portions (4c, 4c ′) that are in surface contact with each other ;
An ink guide path (7) for guiding ink remaining in the ink tank (2) ;
The ink guide path (7) is characterized in that a concave groove communicating with the through holes (4b, 4b ′, 4b ″) is formed on the surface of the partition wall (4) on the ink tank (2) side. Direct liquid writing instrument. In the central part of the partition wall (4), along the outer peripheral surface (5a) of the center core (5), the through hole (4b) which is a space having the same width dimension in the circumferential direction, and the outer periphery of the center core (5) A plurality of the support portions (4c) in surface contact with the surface (5a) are alternately arranged in the circumferential direction ,
The concave groove is formed so as to lead from the outer edge of the partition wall (4) continuous with the inner peripheral surface (2a) of the ink tank (2) to the through hole (4b). The direct liquid writing instrument. The entire inner peripheral surface of the central hole (4a) of the partition wall (4) is the support portion (4c ′) in surface contact with the outer peripheral surface (5a) of the core (5), and the outer edge of the partition wall (4) And providing the through hole (4b ') that is a space of the same width in the circumferential direction,
2. The direct liquid writing instrument according to claim 1, wherein the concave groove is formed so as to lead from the central hole (4a) of the partition wall (4) to the through hole (4b ') .   The entire inner peripheral surface of the central hole (4a) of the partition wall (4) is the support portion (4c ') in surface contact with the outer peripheral surface (5a) of the core (5), and the radial direction of the partition wall (4) The through hole (4b ″) that is a space having the same width in the circumferential direction is provided in the middle position,
  The concave groove includes a portion that communicates from the central hole (4a) of the partition wall (4) to the through hole (4b ″) and a portion that communicates from the outer edge of the partition wall (4) to the through hole (4b ″). The direct liquid type writing instrument according to claim 1.

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