Writing instrument

Abstract

To provide a writing instrument having a relatively simple structure and easy to manufacture.SOLUTION: A writing instrument 1 includes a barrel 10 having an ink holding space 19 formed therein in which an ink holding portion 99 is housed, a collector 30 that receives ink 98 from the ink holding portion 99 housed in the ink holding space 19 and adjusts the supply flow rate of the ink 98, and a writing portion 50 connected to the collector 30. The writing portion 50 has a main portion and a cone portion, and the cone portion has a tip portion 55 that comes into contact with a writing target. The collector 30 has a storage portion 31 that houses the main portion, and a main body portion in which a main ink passage 35 is formed, and a comb groove portion 36 capable of holding a portion of the ink 98 is provided on the outer surface of the main portion. An ink narrow passage 32 is formed between the outer surface of the main portion housed in the storage portion 31 and the inner surface of the storage portion 31. An ink guide groove 58 that guides the ink 98 from the ink narrow passage 32 to the tip portion 55 is formed at least on the outer surface of the cone portion.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This disclosure relates to writing instruments. [Background technology]

[0002] Dip pen-type glass pens, which are said to have been made for the first time in the early 20th century, have become increasingly popular in recent years as writing implements that are not only aesthetically appealing but also comfortable to write with and practical. Dip pen-type glass pens can write as much as the ink stored in the tip of the pen dipped in ink, and the amount of characters, lines, etc. that can be written is relatively small. To solve this inconvenience, Patent Document 1 discloses a glass pen that can continuously supply ink to the tip. The glass pen in Patent Document 1 has a body made of multiple glass strands twisted and molded into a shape with multiple spiral cuts on the outer surface, a head part at one end with multiple grooves concentrated at the tip, and a tip that is elongated and has a long and thin end part at the other end. When the long and thin end part of the tip touches the ink surface in the ink tube cartridge and breaks through the surface tension, the ink is introduced into the spiral cuts and then concentrated at the head part of the tip, automatically supplying ink continuously. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3218808 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the glass pen of Patent Document 1 requires the pen tip to be produced manually, which results in unstable dimensions of each part and high manufacturing costs.

[0005] In view of the above-mentioned problems, the present disclosure relates to providing a writing instrument that has a relatively simple configuration and is easy to manufacture. [Means for solving the problem]

[0006] A writing instrument according to a first aspect of the present disclosure comprises a barrel having an ink retention space formed therein in which an ink retention portion that stores ink is accommodated, a collector that receives ink from the ink retention portion and adjusts the supply flow rate of the ink that has flowed in when the ink retention portion is accommodated in the ink retention space, and a writing portion connected to the collector, wherein the writing portion has a rod-shaped main portion having a predetermined length and a cone portion extending from one end of the main portion, and the cone portion has a tip portion at its tip that contacts an object to be written on, the collector has a storage portion that accommodates the main portion, and a main body portion having a main ink path formed therein that guides the ink that has flowed in from the ink retention portion to the storage portion, the outer surface of the main body portion is provided with a comb groove portion capable of holding a portion of the ink, and an ink narrow path through which ink can flow is formed between the outer surface of the main portion accommodated in the storage portion and the inner surface of the storage portion, and the writing portion has an ink guide groove formed on at least the outer surface of the cone portion that guides ink from the ink narrow path to the tip portion.

[0007] With this configuration, the main part of the writing part, which has a rod-shaped main part and a cone part with an ink guide groove formed therein, can be accommodated in the housing of the collector, and ink can be supplied to the tip part via the ink narrow path and the ink guide groove between the outer surface of the main part and the inner surface of the housing. This makes it possible to provide a writing instrument that is easy to manufacture with a relatively simple configuration that can be machined.

[0008] A writing instrument according to a second aspect of the present disclosure is the writing instrument according to the first aspect of the present disclosure, wherein the writing portion is formed from a material having a durometer D hardness of 60 or more in accordance with JIS K7215.

[0009] With this configuration, the writing implement is made of a relatively hard material, so that the user can enjoy the unique writing feel of a hard material.

[0010] A writing instrument according to a third aspect of the present disclosure is the writing instrument according to the first or second aspect of the present disclosure, wherein the writing portion is formed from a light-transmitting material.

[0011] With this configuration, the color of the ink flowing through the ink guide groove can be visually confirmed when writing, resulting in a writing instrument with excellent design.

[0012] Furthermore, a writing instrument according to a fourth aspect of the present disclosure is a writing instrument according to any one of the first to third aspects of the present disclosure, wherein the writing portion is formed such that an angle between opposing surfaces of the ink guide groove in a cross section perpendicular to the axis is greater than or equal to 40 degrees and less than or equal to 110 degrees.

[0013] With this configuration, it is possible to suppress an increase in the difficulty of forming an ink guide groove in the writing portion while suppressing a decrease in the fluidity of ink in the ink guide groove.

[0014] In addition, a writing instrument according to a fifth aspect of the present disclosure is a writing instrument according to any one of the first to fourth aspects of the present disclosure, wherein the number of ink guide grooves formed in the writing portion is 8 or more and 12 or less.

[0015] With this configuration, the spacing between adjacent ink guide grooves is ensured, allowing each ink guide groove to function independently, while allowing ink to be smoothly supplied from the ink narrow path to the tip portion. Effect of the Invention

[0016] According to the present disclosure, the main part of the writing part, which has a rod-shaped main part and a cone part in which an ink guide groove is formed, is contained in the storage part of the collector, and ink is supplied to the tip part via the ink narrow path and the ink guide groove between the main part and the storage part, resulting in a writing instrument with a relatively simple configuration that is easy to manufacture. [Brief description of the drawings]

[0017] [Figure 1]FIG. 1A is a side view of a writing instrument according to one embodiment, and FIG. 1B is a side cross-sectional view of the writing instrument according to one embodiment. [Diagram 2] 1 is an exploded perspective view of a writing instrument according to an embodiment; [Diagram 3] FIG. 2A is a perspective view of a joint built into a writing implement according to one embodiment, and FIG. 2B is a side cross-sectional view of the joint. [Figure 4] FIG. 2A is a perspective view of a collector built into a writing implement according to one embodiment, FIG. 2B is a side view of the collector, and FIG. 2C is a cross-sectional view taken along CC in FIG. [Diagram 5] 1A is a side view of a writing unit built into a writing implement according to one embodiment, and FIG. 1B is a front view of the writing unit. [Figure 6] FIG. 2 is a partial side cross-sectional view showing the tip portion of a writing implement according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment will be described with reference to the drawings. In the drawings, the same or similar reference numerals are used to designate the same or corresponding parts, and duplicated explanations will be omitted.

[0019] First, a writing instrument 1 according to an embodiment will be described with reference to Figs. 1(A), 1(B) and 2. Fig. 1(A) is a side view of the writing instrument 1, and Fig. 1(B) is a side cross-sectional view of the writing instrument 1. Fig. 2 is an exploded perspective view of the writing instrument 1. In the following description, when a new figure is referred to in order to explain the details of each part constituting the writing instrument 1, the figure will be appropriately referred to in the following description. The writing instrument 1 is generally formed in a long and thin rod shape of a size suitable for holding in the hand. The writing instrument 1 is capable of writing characters, lines, etc. on a paper surface by supplying ink from one end of the long and thin rod to a paper as a writing object. In the following description, the end side of the long and thin writing instrument 1 that contacts the paper surface may be referred to as the "tip side", and the end side opposite to the tip side may be referred to as the "rear end side".

[0020] The writing instrument 1 includes a barrel 10, a collector 30, and a writing part 50. In the present embodiment, the writing instrument 1 further includes a joint 20, a tip member 40, and a cap 60. In the present embodiment, the writing instrument 1 includes a writing part 50 formed of glass, and is a so-called glass pen. In the present embodiment, the writing instrument 1 is capable of supplying ink 98 to a paper surface by mounting an ink tank 99 containing ink 98. In the present embodiment, the ink tank 99 is not mounted during the distribution process of the writing instrument 1 so that the user of the writing instrument 1 can select the color of the ink 98 that he or she likes. In addition, the writing instrument 1 is configured so that the ink tank 99 can be attached and detached so that the color of the ink 98 can be changed depending on the situation. The ink tank 99 is sometimes called an ink cartridge, and is capable of storing and holding the ink 98 in the cartridge, and corresponds to an ink holding part.

[0021] The barrel 10 is a portion that occupies more than half of the length of the writing instrument 1, and is typically a portion that has a length of about 0.6 to 0.7 times the length of the writing instrument 1. The barrel 10 is disposed at the rear end side of the writing instrument 1. The barrel 10 is typically formed in a cylindrical shape. In this embodiment, the barrel 10 is formed in a generally hollow cylindrical shape, but the cross-sectional shape perpendicular to the cylindrical axis may be formed in a polygonal shape such as a hexagon or octagon. The barrel 10 has an open end face at the front end side of the hollow cylindrical shape, and a closed end face at the rear end side. In this embodiment, the barrel 10 has a basic shape with the same diameter from the front end side to about 2 / 3 of the length of the barrel 10, and has a tapered shape in which the diameter gradually decreases as it proceeds toward the rear end side. The barrel 10 typically has a length that contacts the first interdigital space (between the thumb and index finger) or its vicinity (typically the base of the index finger) when the writing instrument 1 is held in the dominant hand in a writing mode. This configuration makes it possible to suppress shaking of the writing instrument 1 during writing, and enables stable writing. The barrel 10 has a hollow cylindrical interior that serves as an ink holding space 19 that can accommodate an ink tank 99. In the present embodiment, the barrel 10 has a window 18 formed on the side of the hollow cylindrical shape, through which the interior can be seen. In the present embodiment, the window 18 is an elongated opening in the axial direction of the barrel 10, and when the ink tank 99 is accommodated in the ink holding space 19, the ink tank 99 can be touched through the window 18. The barrel 10 has a screw thread 12 formed on the hollow cylindrical inner surface at the tip side.

[0022] The joint 20 mediates the connection of the collector 30 to the barrel 10. In this embodiment, the joint 20 has a generally cylindrical appearance in accordance with the shape of the barrel 10. The joint 20 has a flange 23 protruding in the radial direction in the middle of the direction in which the cylindrical axis extends. With respect to the cylindrical shape forming the joint 20, the tip side of the flange 23 is referred to as the front tube 21, and the rear end side of the flange 23 is referred to as the rear tube 22. The joint 20 is configured so that the collector 30 is inserted into the inside of the front tube 21 and the rear tube 22 fits into the barrel 10. Although not shown, the rear tube 22 has a screw thread formed on the outer surface near the tip side. The screw thread formed on the outer surface of the rear tube 22 near the tip side engages with the screw thread 12 formed on the inner surface of the barrel 10, so that the joint 20 is connected to the barrel 10. The flange portion 23 is typically formed so that the cross section perpendicular to the axis of the joint 20 is annular, and the outer diameter thereof is approximately the same as the outer diameter of the tip end side of the barrel 10 .

[0023] 3(A) and 3(B) show the configuration of the joint 20 in more detail. FIG. 3(A) is a perspective view of the joint 20 as seen from the rear end side, and FIG. 3(B) is a side cross-sectional view of the joint 20. In the joint 20, the inside of the front tube 21 is the front storage section 26, and the inside of the rear tube 22 is the rear storage section 27. The front storage section 26 is a space capable of storing the collector 30. The rear storage section 27 is a space capable of storing the ink tank 99. In addition, the joint 20 has a partition 24 provided inside the cylindrical shape. The partition 24 is a member formed in a disk shape, and a hole is formed in the center. The partition 24 is disposed such that a virtual straight line extending perpendicularly to the disk-shaped surface extends in the same direction as the axis of the joint 20. Typically, the position of the partition 24 in the direction in which the axis of the joint 20 extends is substantially the same as the position where the flange section 23 is provided. The partition 24 is connected to the mounting tube 25 extending toward the rear end. In other words, the mounting tube 25 is disposed in the rear storage section 27. The mounting tube 25 is a tube into which an ink tank 99 (see FIG. 2) is mounted. The mounting tube 25 is formed in a shape and size that matches the specifications of the ink tank 99 to be used, and its outer diameter is smaller than the inner diameter of the rear tube 22. One end of the mounting tube 25 is connected to a hole in the center of the partition 24, and the other end has an opening formed therein to allow ink to flow from the ink tank 99. The mounting tube 25 has an ink path 28 formed therein through which ink can pass.

[0024] The collector 30 is a component that receives ink 98 from an ink tank 99 and adjusts the supply flow rate of the ink 98 that has flowed in. In this embodiment, the collector 30 is configured to indirectly receive ink 98 from the ink tank 99 via the joint 20. In this embodiment, the collector 30 is configured to be partially accommodated in the front accommodation portion 26 (see FIG. 3(B)) of the joint 20. The collector 30 is also configured to hold the writing part 50. The collector 30 has a storage portion 31 that holds the writing part 50, and a main body portion 33 that occupies the majority of the collector 30. In the collector 30 that is incorporated in the writing instrument 1, the storage portion 31 is disposed on the front end side, and the main body portion 33 is disposed on the rear end side.

[0025] 4(A) to 4(C) show the configuration of the collector 30 in more detail. FIG. 4(A) is a perspective view of the collector 30 seen from the rear end side, FIG. 4(B) is a side view of the collector 30, and FIG. 4(C) is a cross-sectional view taken along the line CC in FIG. 4(B). In this embodiment, the storage section 31 is formed in a generally cylindrical shape, and an opening having the same diameter as the inner diameter of the generally cylindrical shape is formed on the end face on the front end side, and an opening smaller than the inner diameter of the generally cylindrical shape is formed on the end face on the rear end side. The storage section 31 has recesses recessed by one step formed at appropriate locations on the outer surface. The inner diameter of the storage section 31 is typically formed to a size that can just accommodate the writing part 50. The storage section 31 has a plurality of narrow grooves 32 formed on its inner surface that extend in the axial direction. The narrow grooves 32 formed on the inner surface of the storage section 31 are formed at appropriate intervals in the circumferential direction, and the circumferential intervals may be equal to each other, or may be equal to each other in a set of a plurality of adjacent grooves.

[0026] As clearly seen in FIG. 4(C), the main body 33 of the collector 30 is provided with a middle tube 34 formed in a generally cylindrical shape in this embodiment. The middle tube 34 extends in the axial direction from the end face on the rear end side of the storage section 31. The inner diameter of the middle tube 34 is typically the same as the diameter of the opening formed on the end face on the rear end side of the storage section 31, and the opening formed on the end face on the rear end side is connected to the inside of the middle tube 34. The inside of the middle tube 34 is a space with both ends open in the axial direction, and serves as a main ink passage 35 through which the ink 98 (see FIG. 1(B)) passes. The main body 33 is provided with a comb groove portion 36 on its outer surface. The comb groove portion 36 is formed by arranging a plurality of disk-shaped members (having an outer diameter larger than the outer diameter of the storage section 31 in this embodiment) at intervals in the axial direction, so that grooves are formed between adjacent disk-shaped members. The comb groove portion 36 can also be called a comb-tooth portion because it is formed in a comb-tooth shape in a cross section (see FIG. 4(C)) that passes through the axis of the middle tube 34 and is parallel to the axis. The interval between the grooves formed between the disk-shaped members in the comb groove portion 36 is typically a dimension that allows the ink 98 that flows into the groove to be held in the groove by its surface tension. In the comb groove portion 36, a communication groove 37 that reaches the outer surface of the middle tube 34 is formed at a specific location in the circumferential direction for each of the multiple arranged disk-shaped members. The communication groove 37 extends in the axial direction of the middle tube 34 across the multiple disk-shaped members. The comb groove portion 36 is designed to hold the ink 98 that does not enter the main ink path 35 and goes around to the outside of the middle tube 34. In addition, an air introduction groove is formed in the disk-shaped member on the tip side of the comb groove portion 36, so that the collector 30 can respond to changes in external pressure. The end face on the rear end side of the main body 33 is a disk-shaped member, and an opening communicating with the main ink passage 35 appears in the center thereof, as well as a communication groove 37 extending in the radial direction of the disk-shaped member outside the middle cylinder 34. Typically, the collector 30 is formed such that the storage portion 31 and the main body 33 are integrally formed.

[0027] The tip member 40 is a member that closes the tip side of the joint 20 in which the collector 30 is accommodated in the tip accommodation portion 26 of the joint 20. The tip member 40 has a tapered portion 41 and a reduced diameter portion 43. In this embodiment, the tapered portion 41 is a portion formed in a cylindrical or conical shape whose outer diameter changes continuously, and the outer diameter on the rear end side is substantially the same as the outer diameter of the front tube 21 of the joint 20. The tapered portion 41 is formed so that the outer diameter gradually decreases as it proceeds from the rear end side to the front end side, and the degree of this gradual decrease may be linear or may be a gentle curve. The reduced diameter portion 43 is provided on the rear end side of the tapered portion 41. The reduced diameter portion 43 is formed in a cylindrical shape with a relatively short length in the axial direction. The outer diameter of the reduced diameter portion 43 is smaller than the outer diameter of the end portion on the rear end side of the tapered portion 41, and is typically a size that fits the inner diameter of the front tube 21 of the joint 20. The reduced diameter portion 43 is fitted into the inside of the front tube 21 of the joint 20 by screwing or latching. The tapered portion 41 and the reduced diameter portion 43 are typically formed as one piece, and the inside is continuously penetrated. The inside of the tip member 40 is open at both ends in the axial direction and is formed to a size substantially equal to the outer diameter of the storage section 31 of the collector 30, so that the storage section 31 can be stored. The tip member 40 has a tip opening 45 formed on the end face on the tip side from which the writing part 50 protrudes. The tip opening 45 is slightly smaller than the diameter of the space inside the tip member 40 in order to allow the writing part 50 to protrude while not passing through the collector 30, and is typically formed to a size equal to the inner diameter of the storage section 31 of the collector 30.

[0028] The writing part 50 is a member that supplies ink to the paper surface by contacting the paper as the writing object. The writing part 50 is connected to the collector 30 and mediates the supply of the ink 98 held by the collector 30 to the paper surface. The writing part 50 is typically made of a non-absorbent material (a non-porous material), and in this embodiment, the writing part 50 is made of glass and is formed in a generally cylindrical shape with one end tapered. The writing part 50 preferably has a predetermined hardness so that it can withstand writing on the paper surface, etc. The predetermined hardness here may be, for example, a durometer D hardness of 60 or more according to JIS K7215 (a standard for plastics). If the writing part 50 has a predetermined hardness, there is an advantage that when writing with the writing instrument 1, it is less susceptible to the influence of writing pressure and it is easier to write with a constant line width. The writing part 50 made of glass has translucency. Here, having translucency means that the visible light transmittance is 50% or more. The visible light transmittance can be obtained by measuring the reflectance with a multi-light source spectrophotometer (e.g., Suga Test Instruments Co., Ltd., (MSC-5N)). If the writing part 50 has translucency, the color of the ink 98 can be seen through the writing part 50, improving the aesthetic impression. In this way, the writing part 50 made of glass in this embodiment can be said to be made of a material having a predetermined hardness and translucency.

[0029] 5(A) and 5(B) show the writing part 50. FIG. 5(A) is a side view of the writing part 50, and FIG. 5(B) is a front view of the writing part 50. The writing part 50 has a main part 51 and a cone part 53. In this embodiment, the main part 51 is a part that is accommodated in the storage part 31 of the collector 30 (see FIG. 4(C)). The main part 51 is a rod-like part having a predetermined length, and is formed in a cylindrical shape in this embodiment. The predetermined length of the main part 51 is typically a length that can be stably held by the storage part 31 of the collector 30, and may be approximately the same as the axial length of the storage part 31. The cone part 53 is a part formed in a cone shape extending in the axial direction from one end of the main part 51. In this embodiment, the cone part 53 is formed in a roughly conical shape, and the conical bottom surface is connected to one end surface of the main part 51. The tip 55 of the cone part 53 corresponds to the apex of the cone. The tip 55 is the part that comes into contact with the paper when writing with the writing instrument 1 (see FIG. 1(A)), and is typically slightly rounded. The degree of roundness of the tip 55 may be determined in consideration of the line width when writing with the writing instrument 1. In other words, when writing thin characters, the curvature of the tip 55 should be made large (the radius of curvature should be made small), and when writing thick characters, the curvature of the tip 55 should be made small (the radius of curvature should be made large). The main part 51 and the cone part 53 are connected so that their axes are aligned in the same line, and are formed integrally. Typically, the writing part 50 can be formed by cutting out the part corresponding to the cone part 53 from a cylindrical glass rod. The writing part 50 formed in this manner is suitable for machining, and has a simple configuration and is easy to manufacture compared to conventional pen tips produced by hand.

[0030] The writing part 50 has an ink guide groove 58 formed on the outer surface. The ink guide groove 58 is formed with the intention of guiding the ink 98 that has flowed down the outer surface of the main part 51 from the rear end side of the writing part 50 to the tip part 55. The ink guide groove 58 typically extends parallel to the axis of the writing part 50. In this embodiment, the ink guide groove 58 extends from the boundary 52 between the main part 51 and the cone part 53 to the vicinity of the tip part 55, and also extends from the boundary 52 to a part of the tip side of the main part 51 toward the rear end side. The ink guide groove 58 in the part formed in the main part 51 may have a length of 1 / 5 to 1 / 3 (including 1 / 4) of the length of the main part 51 in the direction in which the axis of the writing part 50 extends. The ink guide groove 58 in the part formed in the main part 51 is preferably formed so that the depth becomes shallower (the distance from the outer surface becomes smaller) as it moves from the boundary 52 toward the rear end side. The ink guide groove 58 in the portion formed in the cone portion 53 is preferably formed so that its depth becomes shallower from the boundary 52 toward the tip portion 55. The ink guide groove 58 can be formed by cutting out the material of the portion where it is to be formed.

[0031] A plurality of ink guide grooves 58 are formed at intervals in the circumferential direction of the writing part 50. The ink guide grooves 58 formed in the writing part 50 are preferably arranged at equal intervals in the circumferential direction. The number of ink guide grooves 58 can be appropriately determined taking into consideration the size of the writing part 50, etc., but from the viewpoint of smooth supply of the ink 98 to the tip part 55, it is preferable to have eight or more, and from the viewpoint of ease of forming the ink guide grooves 58, it is preferable to have twelve or less. Each ink guide groove 58 can adopt various cross-sectional shapes (for example, V-shaped or U-shaped), but in this embodiment, it is formed in a wedge shape (V-shaped) in a cross section perpendicular to the axis of the writing part 50 (see FIG. 5(B)). The angle α between the opposing surfaces of each ink guide groove 58 in the cross section perpendicular to the axis of the writing part 50 may be appropriately determined taking into consideration the fluidity of the ink 98 in the ink guide groove 58. The angle α of the ink guide groove 58 is preferably 40 degrees or more in order to prevent a decrease in the fluidity of the ink 98, and is preferably 110 degrees or less in order to prevent an increase in the difficulty of forming the ink guide groove 58 in the writing part 50.

[0032] The above-mentioned components can be assembled into the writing instrument 1 as follows. First, the main body 33 of the collector 30 is inserted into the front housing 26 in the front tube 21 of the joint 20. Next, the writing part 50 is inserted into the housing 31 of the collector 30 from the main part 51 side. Note that the process up to this point may be performed by inserting the writing part 50 into the housing 31 of the collector 30 from the main part 51 side, and then inserting the collector 30 with the writing part 50 inserted into the front housing 26 of the joint 20 from the main body 33 side. After the joint 20, the collector 30, and the writing part 50 are connected, the tip member 40 is inserted into the connection body from the writing part 50 side with the reduced diameter part 43 facing the connection body, and the tip member 40 is placed over the housing 31 of the collector 30, and the reduced diameter part 43 is inserted into the front housing 26 of the joint 20. In this manner, the tip side of the writing instrument 1 is assembled.

[0033] FIG. 6 is a partial side cross-sectional view of the tip side of the writing instrument 1. In the writing instrument 1, a gap appears between the outer surface of the main part 51 of the writing part 50 and the inner surface of the storage part 31 of the collector 30 at a portion corresponding to the narrow groove 32. In this embodiment, the narrow groove 32 functions as an ink narrow path. The ink narrow path is typically an ink flow path having a width that allows ink to move by capillary action. The narrow groove 32 functioning as an ink narrow path is connected to an ink guide groove 58 formed in the main part 51 of the writing part 50 at the tip side. With this configuration, ink can be guided from the ink narrow path to the ink guide groove 58.

[0034] When the writing instrument 1 is distributed without the ink tank 99, the tip side of the writing instrument 1 and the barrel 10 can be connected by screwing the thread 12 formed on the inner surface of the barrel 10 into the thread formed on the outer surface of the rear tube 22 at the tip side of the writing instrument 1 described above. When writing with the writing instrument 1 for the first time, the barrel 10 can be removed from the tip side of the writing instrument 1, the ink tank 99 can be fitted into the rear storage section 27 of the joint 20, and the barrel 10 can be screwed back into the tip side of the writing instrument 1. When fitting the ink tank 99 into the joint 20, the fitting tube 25 of the joint 20 is fitted so that it enters the inside of the cartridge from the end face of the cartridge of the ink tank 99.

[0035] When the ink tank 99 is fitted to the joint 20, the ink 98 in the ink tank 99 flows into the ink path 28 inside the mounting tube 25. The ink 98 that passes through the ink path 28 reaches the collector 30 housed in the front housing portion 26 and flows into the main ink path 35 that is connected to the ink path 28. Note that, in accordance with a change in external pressure, a part of the ink 98 that has reached the collector 30 from the ink path 28 may flow into the comb groove portion 36 from the rear end of the communication groove 37 formed in the main body portion 33 and be retained therein. The ink 98 that has flowed into the main ink path 35 flows toward the writing portion 50. The ink 98 that has reached the rear end side of the writing portion 50 from the main ink path 35 passes through the ink narrow path corresponding to the narrow groove 32 and moves to the tip side. The ink 98 that has moved through the ink narrow path to the tip side enters the ink guide groove 58 and reaches the tip portion 55. When the ink 98 reaches the tip 55, the ink 98 is transferred from the writing instrument 1 to the paper surface when the tip 55 is brought into contact with the paper surface, and writing is performed by moving the writing instrument 1 along the paper surface while keeping the tip 55 in contact with the paper surface. When the ink 98 flows with writing as described above, air flows into the collector 30 from the air introduction groove formed in the disk-shaped member on the tip side of the comb groove portion 36. The air that flows in reaches the inside of the ink tank 99 via the communication groove 37 formed in the collector 30, and replaces the ink 98 inside the ink tank 99, thereby realizing a smooth flow of the ink 98. In this embodiment, since the writing part 50 is formed of glass, the ink 98 in the ink guide groove 58 can be seen through the glass from the outer surface of the writing part 50 outside the ink guide groove 58, and the color of the ink 98 shines due to reflection through the glass, resulting in an excellent aesthetic appearance. In other words, the writing instrument 1 has excellent design.

[0036] The writing instrument 1 includes a cap 60 that covers the tip side of the writing instrument 1 to prevent the ink 98 from drying. The cap 60 typically includes an outer tube 61, a spring 63, and an inner lid 65, as shown in Figs. 1(B) and 2. The outer tube 61 is a main component of the cap 60, and is formed in a cylindrical shape with a length that can cover the joint 20 on the tip side of the flange 23, the tip member 40, and the writing part 50 protruding from the tip member 40. The outer diameter of the outer tube 61 is typically formed to be the same as the outer diameter of the shaft tube 10 at the part that contacts the flange 23. The outer tube 61 has a protrusion 62 that protrudes slightly inward at the middle position in the axial direction on the inside thereof, as shown in Fig. 1(B). The spring 63 is typically a compression coil spring, and the outer diameter is substantially the same as the inner diameter of the outer tube 61 (excluding the part of the protrusion 62). The spring 63 is provided inside the outer cylinder 61 on the tip side of the projection 62 .

[0037] The inner lid 65 plays a role of holding the spring 63 in the outer tube 61. The inner lid 65 is formed in a generally cylindrical shape, and one end face of the lid tube 66, which occupies most of the inner lid 65, is closed, and an expanded diameter portion 67 is provided at the other end of the lid tube 66. The expanded diameter portion 67 is open at both the end face connected to the lid tube 66 and the opposite end face. The lid tube 66 has an outer diameter that is substantially the same as the inner diameter of the compression coil spring that constitutes the spring 63. The inner diameter of the lid tube 66 is larger than the minimum outer diameter of the tip member 40 and smaller than the maximum outer diameter. The expanded diameter portion 67 has an outer diameter that is larger than the inner diameter of the compression coil spring that constitutes the spring 63 and the inner diameter of the protrusion 62 portion, and smaller than the inner diameter of the outer tube 61 (or substantially the same as the inner diameter of the outer tube 61). The inner diameter of the expanded diameter portion 67 is smaller than the maximum outer diameter of the tip member 40. The expanded diameter portion 67 is typically smoothly connected to the lid tube 66 such that the outer diameter increases with increasing distance from the lid tube 66 .

[0038] The cap 60 is constructed by inserting the spring 63 into the outer cylinder 61, inserting the inner lid 65 therein from the lid cylinder 66 side, and pushing it in until the rear end of the enlarged diameter portion 67 passes the protrusion 62. In the cap 60 constructed in this way, the boundary between the lid cylinder 66 and the enlarged diameter portion 67 is located at the rear end of the spring 63. When the inner lid 65 is pushed toward the tip side, it overcomes the biasing force of the spring 63 and moves toward the tip side away from the protrusion 62, and when the external force pushing it toward the tip side is removed, it can move back and forth in the axial direction toward the protrusion 62 due to the lack of force of the spring 63. The inner lid 65 biased by the spring 63 gets caught on the protrusion 62 and does not move beyond the protrusion 62 toward the rear end side.

[0039] When the cap 60 is fitted to cover the tip tube 21 of the joint 20 of the writing instrument 1, the tip member 40 first comes into contact with the inner lid 65, which is caught on the protrusion 62 and is stationary. When the cap 60 is further pushed toward the flange 23, the inner lid 65 is pushed by the tip member 40 and moves toward the tip side. When the outer tube 61 reaches the flange 23, the cap 60 is completely fitted into the tip tube 21 of the joint 20. At this time, the inner lid 65 is biased toward the tip member 40 by the spring 63 and is in close contact with the tip member 40. This seals the inside of the inner lid 65, making it possible to prevent the ink 98 around the writing part 50 from drying out.

[0040] The writing instrument 1 can change the color of the ink 98 used. When changing the color of the ink 98, it is advisable to clean the tip side of the writing instrument 1. At this time, it is advisable to disassemble and clean the joint 20, collector 30, tip member 40, and writing part 50 in the reverse order to the procedure for assembling the tip side of the writing instrument 1 described above. Since the writing instrument 1 has a relatively simple configuration, it can be easily disassembled and cleaned.

[0041] In the above description, the writing object is described as being paper, but depending on the application, the properties of the ink 98, and the like, the writing object may be a film or board made of synthetic resin, metal, or the like.

[0042] In the above description, the ink retaining portion is an ink tank 99 filled with ink 98 and placed in circulation, but it may be a converter (an inhaler that inhales ink 98 contained in a container) or the like. Also, the ink retaining portion may be an ink retaining container that is permanently installed inside the barrel 10 (not removable from the barrel 10) and configured to retain ink that is inhaled from outside the writing instrument 1.

[0043] In the above description, the barrel 10 and the collector 30 are connected via the joint 20, but the collector 30 may be configured to be directly attached to the barrel 10. In this case, for example, the barrel 10 and the same configuration as the joint 20 may be integrally molded so that the portion corresponding to the joint 20 occupies a part of the barrel 10. Alternatively, the collector 30 may be provided with a portion that connects to the ink tank 99, such as the mounting tube 25, so that the collector 30 receives the ink 98 directly from the ink tank 99.

[0044] In the above description, the writing part 50 is made of glass, but it may be made of a material other than glass, such as a synthetic resin or metal. For example, if the writing part 50 is made of a synthetic resin such as acrylic resin or polymethylpentene, the writing part 50 can have a predetermined hardness and translucency. Also, if the writing part 50 is made of a metal such as stainless steel, the writing part 50 can have a predetermined hardness and excellent durability. Since the writing instrument 1 supplies the ink 98 to the paper surface through the outer surface of the writing part 50, various materials can be used for the writing part 50, and the writing feel specific to the material used for the writing part 50 can be enjoyed.

[0045] In the above description, the main portion 51 of the writing part 50 is formed in a cylindrical shape, but it may be formed in a long and thin columnar shape whose cross section perpendicular to the axis is a polygonal shape such as a hexagon or octagon. Also, the pyramidal portion 53 of the writing part 50 is formed in a cone shape, but it may be formed in a pyramidal shape such as a hexagonal pyramid or an octagonal pyramid to match the shape of the end face of the main portion 51. [Explanation of symbols]

[0046] 1 Writing implement 40 Tip member 10 barrel 41 tapered portion 12 Thread 43 Reduced diameter section 18 Window 45 Front Opening 19 Ink holding space 50 Writing part 20 Joint 51 Main section 21 Nozzle 52 Boundary 22 Rear tube 53 Cone part 23 Flange 55 Tip 24 Partition 58 Ink guide groove 25 Attachment tube 60 Cap 26 Front housing portion 61 Outer cylinder 27 Rear storage section 62 Protrusion 28 Ink Road 63 Spring 30 Collector 65 Inner lid 31 Storage section 66 Lid tube 32 Narrow groove (ink narrow passage) 67 Enlarged diameter section 33 Main body 98 Ink 34 Inner cylinder 99 Ink tank 35 Angle between ink main path and ink path α 36 Comb groove 37 Communication groove

Claims

1. a barrel having an ink holding space formed therein for accommodating an ink holding portion for storing ink; a collector that receives ink from the ink holding portion and adjusts a supply flow rate of the ink that has flowed in when the ink holding portion is accommodated in the ink holding space; a writing portion connected to the collector; the writing part has a rod-shaped main part having a predetermined length and a cone part extending from one end of the main part, the cone part having a tip part at a tip end thereof that comes into contact with a writing object, the collector has a storage section that stores the main section, and a main body section having an ink main passage formed therein that guides the ink flowing from the ink retaining section to the storage section, and a comb groove section that is capable of retaining a portion of the ink is provided on an outer surface of the main body section; an ink passage through which ink can flow is formed between an outer surface of the main portion accommodated in the accommodation portion and an inner surface of the accommodation portion; The writing part has an ink guide groove formed on at least the outer surface of the cone part, the ink guide groove directing ink from the ink narrow path to the tip part. Writing implements.

2. The writing part is formed of a material having a durometer D hardness of 60 or more in accordance with JIS K7215.

2. The writing instrument of claim 1.

3. The writing part is formed of a light-transmitting material.

2. The writing instrument of claim 1.

4. The writing part is formed such that an angle between opposing surfaces of the ink guide groove in a cross section perpendicular to the axis is 40 degrees or more and 110 degrees or less.

2. The writing instrument of claim 1.

5. The number of the ink guide grooves formed in the writing portion is 8 or more and 12 or less.

5. The writing instrument according to claim 1.

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