Notebook

Abstract

To provide a writing instrument and a pen tip part capable of adjusting the circumferential position of a finger guide portion with respect to a writing portion.SOLUTION: A writing instrument 1 and a pen tip part 2 include a pen tip 11 having a writing portion 22 and having a writing direction definition of the writing portion 22, a cylindrical inner cylinder 13 for fixing the pen tip 11, a cylindrical outer cylinder 14 having a finger guide portion 41 on the outer circumferential surface into which the inner cylinder 13 can be inserted, and a fixture 15 for fixing the outer cylinder 14 to the inner cylinder 13.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention is for writing with a pen tip. Ingredients There is.

Background Art

[0002] Writing tools for writing on the paper surface of paper sheets with a pen tip are known. Such writing tools are held by the user's fingers. For this reason, various improvements have been made to the shape and material of the grip part of the writing tool, and those with improvements such as ease of gripping, non-slip, and fatigue reduction are known. Ballpoint pens are known (for example, see Patent Document 1).

[0003] As the shape of the grip part of the ballpoint pen of the writing tool, for example, there are various shapes such as a cylindrical shape, a frustum of a cone shape, a shape where one or more places of a cylindrical shape or a frustum of a cone shape are cut off, a shape where a part of the entire circumference is recessed, or a convex shape. Also, the resin material forming the grip part has various hardness settings, from hard to soft, and furthermore, those incorporating air or gel are known. Also, writing tools using a metal material as the material of the grip part are known.

[0004] Also, as a fountain pen which is a writing tool, in order to align the crest or pattern of the main body with the pen tip, a technique is known in which the writing part unit can be rotatably arranged with respect to the fountain pen main body, and the rotational resistance can be changed and set by increasing or decreasing the elastic body to be attached (for example, see Patent Document 2).

[0005] Also, bamboo pens in which a bamboo pen tip body is inserted into a pen shaft are known (for example, see Patent Document 3).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] In the technology described in Patent Document 1, while it is easy to hold, depending on the type of writing instrument, such as a ballpoint pen, the writing part and the paper surface are in constant contact, so stable writing can be performed even if the position of the writing instrument changes when held in the fingers while writing. On the other hand, with writing instruments such as ballpoint pens, the grip part against the fingers is not constant, and the fit while writing may change each time the user changes their grip, so it may not be possible to obtain the preferred fit when using it.

[0008] For example, while it's possible to adjust the grip of a cylindrical or truncated cone-shaped grip by changing your own grip, you'll need to find a grip that feels comfortable each time you switch grips.

[0009] Furthermore, one could consider adding markings to the writing instrument, such as indentations in one or more places on the grip, to help with how to hold it with the fingers. However, if one's grip doesn't align with the shape of the writing section and the paper, based on these markings, they won't be able to achieve their preferred fit.

[0010] Furthermore, while the technologies described in Patent Documents 2 and 3 allow for adjustment of the position by grasping the area near the writing section during assembly or when the pen is dry and ink is not installed, this can cause smudging of fingers when the pen is in the ink-filled state.

[0011] Furthermore, some writing instruments, such as fountain pens, should not have strong force applied to the writing section after assembly, and it is difficult to adjust the writing section of such instruments after writing.

[0012] Furthermore, while there are no particular problems with writing instruments like ballpoint pens, where the tip of the writing part is spherical and always makes consistent contact with the paper, there are also writing instruments where the writing part and the paper do not make consistent contact depending on how the individual holds the instrument. This is due to the design and variations of the product itself, as well as individual gripping and writing habits. Typical writing instruments where this problem occurs include fountain pens, which have sharpened nibs, and brushes, such as markers, which have a directional tip shape, where the optimal writing direction and stiffness change depending on how the bristles are bundled. With these writing instruments, depending on the position (direction) of the writing part of the nib, you may experience snagging, skipping, or splitting of the writing line, which can be annoying when writing.

[0013] Therefore, the present invention allows for adjustment of the circumferential position of the finger guide portion relative to the writing portion. Ingredients The purpose is to provide. [Means for solving the problem]

[0014] A writing instrument according to one aspect of the present invention comprises: a pen tip having a writing section and a writing direction criterion for the writing section; a cylindrical inner cylinder for fixing the pen tip; a cylindrical outer cylinder into which the inner cylinder can be inserted and which has a finger guide on its outer surface; a fixing device for fixing the outer cylinder to the inner cylinder; and a body fixed to the inner cylinder. The inner cylinder has a seat formed on one end side that abuts against one axial end of the outer cylinder, and a male screw portion formed on the other end side; the fixing device is formed in a cylindrical shape that abuts against the other end of the outer cylinder and has a female screw portion on its inner circumferential surface that screws into the male screw portion, and the female screw portion screws into the male screw portion and abuts against the other axial end of the outer cylinder, thereby restricting the axial movement of the outer cylinder; the inner cylinder has a plurality of projections formed on a part of the outer circumferential surface facing the outer cylinder between the seat and the male screw portion and arranged in the circumferential direction; the outer cylinder has a plurality of recesses formed on the inner circumferential surface facing the plurality of projections, which engage with the plurality of projections in the circumferential direction when the movement of the outer cylinder is restricted by the fixing device, and where the plurality of projections are located . [Effects of the Invention]

[0016] According to the present invention, the circumferential position of the finger guide portion relative to the writing portion can be adjusted. Ingredients It can be provided. [Brief explanation of the drawing]

[0017] [Figure 1] A cross-sectional view showing the configuration of a writing instrument according to one embodiment of the present invention. [Figure 2] A cross-sectional view showing the structure of the pen tip component of the writing instrument. [Figure 3] A cross-sectional view showing the structure of the pen tip component. [Figure 4] A perspective view showing the configuration of the pen tip component. [Figure 5] Cross-sectional view showing the configuration of the inner cylinder and the outer cylinder of the pen tip component. [Figure 6] Explanatory drawing showing an example of the use of the writing instrument. [Figure 7] Explanatory drawing showing an example of the use of the writing instrument. [Figure 8] Cross-sectional view showing the configuration of the pen tip component of the writing instrument according to another embodiment of the present invention. [Figure 9] Cross-sectional view showing the configuration of the pen tip component of the writing instrument according to another embodiment of the present invention.

Mode for Carrying Out the Invention

[0018] Hereinafter, a writing instrument 1 according to an embodiment of the present invention and a pen tip component 2 used in the writing instrument 1 will be described with reference to FIGS. 1 to 7.

[0019] FIG. 1 is a cross-sectional view showing the configuration of a writing instrument 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of the pen tip component 2 of the writing instrument 1. FIG. 3 is a cross-sectional view showing the configuration of the pen tip component 2 and an example of its use. FIG. 4 is a perspective view showing the configuration of the pen tip component 2. FIG. 5 is a cross-sectional view showing the configuration of the inner cylinder 13 and the outer cylinder 14 of the pen tip component 2. FIG. 6 is an explanatory drawing showing an example of the use of the writing instrument 1. In FIG. Note that the left figure shows the state before the position adjustment of the outer cylinder 14, and the right figure shows the state after the position adjustment of the outer cylinder 14. FIG. 7 is an explanatory drawing showing the positional relationship between the guide portion 41 of the outer cylinder 14 and the writing portion 22 of the pen tip 11 as an example of the use of the writing instrument 1.

[0020] In the present embodiment, the writing instrument 1 has a direction regulation for writing. Here, the direction regulation for writing means that when applying ink onto the paper surface of paper using the writing instrument 1, when the circumferential position of the writing instrument 1 is at a specific position, a predetermined writing can be performed. Also, here, the predetermined writing is, for example, writing in which there are no catches during writing, smudges on the writing line, cracks in the writing line, etc. due to the position (direction) of the writing portion of the pen tip.

[0021] For example, writing instruments 1 that have a defined writing direction include fountain pens with sharpened nibs, markers with directional tip shapes, and brushes whose optimal writing direction and stiffness change depending on how the bristles are bundled. While writing instruments 1 are not limited to these, in this embodiment, writing instruments 1 will be explained using the example of a fountain pen.

[0022] As shown in Figure 1, the writing instrument 1 comprises, for example, a nib 11, a feed 12, an inner cylinder 13, an outer cylinder 14, a fixing device 15, a barrel 16, and an ink tank 17. For example, as shown in Figures 2 and 3, the nib 11, feed 12, inner cylinder 13, outer cylinder 14, and fixing device 15 of the writing instrument 1 constitute the nib component 2.

[0023] The pen tip 11 has a writing direction guide. As shown in Figures 1 to 4, 6 and 7, the pen tip 11 comprises a pen body 21 and a writing section 22 formed at the tip of the pen body 21. The pen body 21 is formed in a thin, plate-like shape with a pointed tip. The pen body 21 is made of, for example, an ink-resistant material.

[0024] In this embodiment, when the writing instrument 1 is a fountain pen, the pen body 21 is made of a metal material resistant to acids and alkalis, such as a gold alloy or stainless steel. The writing section 22 is formed at the tip of the pen body 21 and is designed to apply ink to the paper surface.

[0025] As a specific example, as shown in Figures 2, 4, 6, and 7, the pen body 21 is provided with a pen point 23 at its tip. Also, as shown in Figure 4, a heart-shaped hole 24 is formed between the tip and the center of the pen body 21, and a slit 25 is formed from the tip of the pen body 21, including the pen point 23, to the heart-shaped hole 24. The pen body 21 has markings such as letters, figures, designs, or trademarks, for example, by grooves, engravings, printing, plating, etc. The writing section 22 is the pen point 23 with the slit 25 formed therein.

[0026] The pen tip 11 receives ink through a slit 25 formed in the pen body 21 via capillary action to the tip of the pen body 21, and the pen point 23, acting as the writing section 22, can apply the ink supplied through the slit 25 to the surface of paper sheets.

[0027] The nib 12 supplies ink to the pen tip 11. For example, the nib 12 uses capillary action to draw ink from the ink tank 17 to the pen tip 11. The nib 12 also takes in air to replace the amount of ink that has flowed to the pen tip 11, performing what is known as gas-liquid exchange, and thus facilitating the ink flow from the ink tank 17 to the pen tip 11.

[0028] As shown in Figures 1 to 3, one end of the pen nib 12 is fixed to the pen tip 11, and the other part is fixed inside the inner cylinder 13. For example, the other end of the pen nib 12 is formed to have a smaller diameter than the other part and is placed inside the ink tank 17.

[0029] The inner cylinder 13 is the so-called barrel or neck section. As shown in Figures 1 to 3, the inner cylinder 13 holds the feed 12 to which the nib 11 is attached, such that the writing section 22, which is the tip of the nib 11, and the heart-shaped hole are at least exposed to the outside. For example, the inner cylinder 13 holds the feed 12 by fitting the feed 12 into its interior.

[0030] As shown in Figures 1 to 4, the inner cylinder 13 includes, for example, a seat portion 31, a male screw portion 32, a projection portion 33, and a fixing portion 34.

[0031] The seat portion 31 is formed, for example, on the outer circumferential surface of one end of the inner cylinder 13 in the axial direction. The seat portion 31 is an annular projection formed on the outer circumferential surface of one end of the inner cylinder 13 and projecting radially outward. The end face of the seat portion 31 abuts against the end of the outer cylinder 14.

[0032] The male screw portion 32 is formed on the outer circumferential surface of the other end of the inner cylinder 13 in the axial direction.

[0033] The projection 33 is a projection formed on a part of the outer circumferential surface of the inner cylinder 13 between the seat portion 31 and the male screw portion 32. As shown in Figure 2, the projection 33 is formed on a part that faces radially opposite the outer cylinder 14 when the inner cylinder 13 is placed inside the outer cylinder 14. For example, the projection 33 is formed on the outer circumferential surface of the inner cylinder 13 adjacent to the seat portion 31. As shown in Figures 2 to 4, the projection 33 is, for example, a projection extending in the axial direction of the inner cylinder 13.

[0034] As shown in Figure 5, multiple projections 33 are provided around the inner cylinder 13 at predetermined intervals. Here, the multiple projections 33 may be arranged at equal or unequal intervals around the inner cylinder 13. In this embodiment, as shown in Figure 5, four projections 33 are provided around the inner cylinder 13 at 90° intervals. Furthermore, the cross-sectional shape of the projections 33 perpendicular to the longitudinal direction is formed, for example, as a trapezoid with a narrow top.

[0035] The fixing portion 34 is provided, for example, inside the inner cylinder 13 and is formed in a cylindrical shape with a diameter smaller than the inner diameter of the inner cylinder 13. As shown in Figure 1, the fixing portion 34 is formed to be able to fix the ink tank 17. The tip of the fixing portion 34 is inclined, for example, with respect to the axial direction. The other end of the pen nib 12 is positioned inside the fixing portion 34.

[0036] The outer cylinder 14 is formed in a cylindrical shape. The outer cylinder 14 is formed to be slightly larger in diameter than the outer diameter of the inner cylinder 13, for example, so that it can be inserted into the inner cylinder 13. The outer cylinder 14 constitutes the grip portion of the writing instrument 1. As shown in Figures 4 and 7, the outer cylinder 14 has guide portions 41 on its outer circumferential surface for the user to grip with their fingers.

[0037] Furthermore, as shown in Figure 4, for example, the outer cylinder 14 has a plurality of grooves 42 formed on its inner circumferential surface at a predetermined interval in the circumferential direction on one end facing the seat portion 31 of the inner cylinder 13. Also, for example, the inner diameter of the other end of the outer cylinder 14 is formed to be larger than the inner diameter from one end to the other end.

[0038] The guide portion 41 is a part formed on the outer circumferential surface side of the outer cylinder 14 by a recess, protrusion, or predetermined shape that the user's fingers contact. The guide portion 41 guides the position of the user's fingers. For example, in this embodiment, the guide portion 41 is two recesses 41a, 41a arranged at two locations in the circumferential direction on the outer circumferential surface of the outer cylinder 14, as shown in Figures 4 and 7. As shown in Figure 7, the two recesses 41a, 41a are formed, for example, of the same shape, and the writing instrument 1 is positioned on the upper side of the outer circumferential surface of the outer cylinder 14 in a writing position so that the thumb and index finger can contact them.

[0039] As shown in Figures 2 to 4, the groove 42 is a recess extending in the axial direction. For example, multiple grooves 42 are provided at predetermined intervals in the circumferential direction of the outer cylinder 14. The groove 42 may be formed by cutting out the inner circumferential surface of the outer cylinder 14, or it may be formed between multiple projections that extend in the axial direction on the inner circumferential surface of the outer cylinder 14. The groove 42 can accommodate the projection 33 and engages with the positioned projection 33 in the circumferential direction. The groove 42 is formed on the inner circumferential surface of the outer cylinder 14 in a portion that faces radially the projection 33 formed on the inner cylinder 13 when the inner cylinder 13 is placed inside the outer cylinder 14. The groove 42 is formed on the inner circumferential surface of the end of the outer cylinder 14 that abuts against the inner cylinder 13.

[0040] Multiple grooves 42 are arranged into which multiple projections 33 are inserted, and the grooves 42 into which the projections 33 are arranged engage with the projections 33 in the circumferential direction, thereby restricting the relative movement of the inner cylinder 13 and the outer cylinder 14 in the circumferential direction.

[0041] As shown in Figure 5, the number of grooves 42 is greater than the number of protrusions 33 formed on the inner cylinder 13. For example, the grooves 42 are arranged at equal intervals in the circumferential direction of the outer cylinder 14. However, the grooves 42 may be arranged at non-equal intervals in the circumferential direction of the outer cylinder 14, provided that the multiple protrusions 33 can be arranged. In this embodiment, as shown in Figure 5, for example, the grooves 42 are provided at 36 locations in the circumferential direction of the inner cylinder 13 at 10° intervals. Also, the opening cross-sectional shape perpendicular to the longitudinal direction of the groove 42 is formed, for example, as a trapezoid with a narrow bottom width.

[0042] The fastener 15 secures the outer cylinder 14, which is positioned on the outer circumferential surface side of the inner cylinder 13, to the inner cylinder 13. Specifically, the fastener 15 is formed in a cylindrical shape such that one end in the axial direction abuts against the other end of the outer cylinder 14. The axial length of the fastener 15 is smaller than the axial length of the male threaded portion 32 of the inner cylinder 13.

[0043] The fastener 15 shown in Figures 2 to 4 has a female threaded portion 51 formed on its inner circumferential surface. In other words, the fastener 15 is a so-called screw ring. Also, as shown in Figures 2 to 4, the fastener 15 has, for example, a projection 52 formed radially towards the center of the end that abuts against the outer cylinder 14.

[0044] The female threaded portion 51 is formed on the inner circumferential surface of the fastener 15 and screws into the male threaded portion 32 of the inner cylinder 13.

[0045] The projection 52 is an annular projection that extends axially and is formed coaxially with the fixing device 15. The outer diameter of the projection 52 is the same as or slightly larger than the inner diameter of the other end of the outer cylinder 14. The outer circumferential surface of the projection 52 abuts against the inner circumferential surface of the other end of the outer cylinder 14, and supports the other end of the outer cylinder 14 in the radial direction.

[0046] The barrel 16 is fixed to the inner cylinder 13. The barrel 16 is formed in a bottomed cylindrical shape and can accommodate an ink tank 17 inside. The barrel 16 has a female threaded portion 61 formed on the inner circumferential surface of one open end. The female threaded portion 61 is screwed into the male threaded portion 32 of the inner cylinder 13.

[0047] The ink tank 17 stores ink. The ink tank 17 can be, for example, a disposable ink cartridge or a converter, which is an ink refiller. The ink tank 17 is fixed to the fixing part 34 of the inner cylinder 13 and supplies ink to the pen nib 12 located in the fixing part 34.

[0048] In the writing instrument 1 (pen tip component 2) configured in this way, for example as shown in Figure 5, the axial lengths of the multiple protrusions 33 and multiple grooves 42 are set such that, when the fixing device 15 is moved to the rear end side of the male threaded portion 32 of the inner cylinder 13 opposite to the pen tip 11 side, the protrusions 33 and grooves 42 separate, and the outer cylinder 14 can rotate circumferentially relative to the inner cylinder 13. In other words, the axial lengths of the multiple protrusions 33 and multiple grooves 42 are set to be shorter than the length obtained by subtracting the sum of the length of the outer cylinder 14 and the length of the fixing device 15 excluding the protrusions 52 from the length of the seat portion 31 of the inner cylinder 13 to the rear end. To put it another way, the axial lengths of the multiple protrusions 33 and multiple grooves 42 are smaller than the axial length over which the fixing device 15 can be screwed into the male threaded portion 32, that is, the distance the fixing device 15 can move in the screwed state on the male threaded portion 32.

[0049] With the writing instrument 1 (pen tip component 2) configured in this way, as shown in Figures 2 and 5, when the multiple protrusions 33 and multiple grooves 42 are engaged, the relative circumferential movement of the inner cylinder 13 and the outer cylinder 14 is restricted. Also, as shown in Figure 2, the fixing device 15 is screwed onto the male threaded portion 32 of the inner cylinder 13, causing the outer cylinder 14 to abut against the seat portion 31 of the inner cylinder 13 and the end face of the fixing device 15, thereby restricting the relative axial movement of the inner cylinder 13 and the outer cylinder 14. Furthermore, as shown in Figure 2, one end of the outer cylinder 14 is radially supported by the inner cylinder 13 as the multiple grooves 42 abut radially against the multiple protrusions 33 of the inner cylinder 13, and the other end of the outer cylinder 14 is radially supported by the fixing device 15 screwed onto the inner cylinder 13 as the inner circumferential surface abuts radially against the outer circumferential surface of the protrusion 52 of the fixing device 15. As a result, the outer cylinder 14 is supported radially at both ends relative to the inner cylinder 13, thus restricting its radial movement relative to the inner cylinder 13. In this way, the outer cylinder 14 is fixed to the inner cylinder 13.

[0050] Therefore, even if the writing instrument 1 (pen tip component 2) is configured so that the outer cylinder 14 can move axially and circumferentially relative to the inner cylinder 13, it is possible to prevent the outer cylinder 14 from moving during use. Furthermore, when the user holds the writing instrument 1 with their fingers for writing, the fingers are guided by the guide portion 41, so that the writing instrument 1 can be used with a consistent grip.

[0051] Furthermore, although the writing instrument 1 (pen tip component 2) has a pen tip 11 that determines the direction of writing, the outer cylinder 14 can rotate relative to the inner cylinder 13, allowing the circumferential position of the guide portion 41, to which the user's fingers make contact, relative to the writing portion 22 of the pen tip 11 can be adjusted. As a result, as shown in the left diagram of Figure 6, if the contact surface of the writing portion 22 of the pen tip 11 with respect to the paper surface 100a is tilted relative to the paper surface 100a with respect to the surface direction of the paper sheet 100a, making proper writing impossible, the contact surface of the writing portion 22 with respect to the paper surface 100a can be adjusted to a suitable position relative to the paper surface 100a, as shown in the right diagram of Figure 6, even if the user holds the writing instrument 1 in the same grip.

[0052] Specifically, as shown in Figure 2, the relative circumferential movement of the inner cylinder 13 and the outer cylinder 14 is restricted by the engagement of multiple protrusions 33 and multiple grooves 42. Then, as shown in Figure 3, the outer cylinder 14 can be rotated circumferentially relative to the inner cylinder 13 by shifting the inner cylinder 13 and the outer cylinder 14 in the axial direction until the multiple protrusions 33 and multiple grooves 42 are disengaged.

[0053] As shown by the arrows in Figure 7, the outer cylinder 14 is rotated circumferentially relative to the inner cylinder 13 so that the user's fingers and the guide part 41 are in a suitable positional relationship with respect to the writing part 22 of the pen tip 11, and the outer cylinder 14 is fixed by the fixing device 15, thereby allowing the position of the guide part 41 of the outer cylinder 14 to be adjusted relative to the writing part 22 of the pen tip 11. Therefore, the writing instrument 1 can adjust the relative position of the writing part 22 of the pen tip 11 and the guide part 41 of the outer cylinder 14, which is the grip part, to be in an appropriate position for the user's way of holding the writing instrument 1. Thus, the writing instrument 1 can make optimal contact between the writing part 22 and the paper surface 100a when writing, so that the writing part 22 fits the paper surface 100a regardless of the user's way of holding it, preventing snagging, smudging of the writing line, splitting of the writing line, etc. when writing.

[0054] Furthermore, the circumferential position of the outer cylinder 14 relative to the writing section 22 of the pen tip 11 can be adjusted to the same number of positions as the number of grooves 42. For example, in this embodiment, since 36 grooves 42 are provided, the outer cylinder 14 can be fixed at 36 positions in the circumferential direction. That is, in this embodiment, the outer cylinder 14 can be rotated relative to the writing section 22 of the pen tip 11 at 10° intervals.

[0055] Furthermore, in adjusting the outer cylinder 14, the fixing device 15 does not need to be completely removed from the male threaded portion 32 of the inner cylinder 13. Instead, it is sufficient to rotate the device 15 until the multiple protrusions 33 and multiple grooves 42 are disengaged in the axial direction, move the outer cylinder 14 axially relative to the inner cylinder 13, and then rotate the outer cylinder 14 in the direction that tightens the fixing device 15. Also, by disengaging the protrusions 33 and grooves 42, the rotation of the outer cylinder 14 is not restricted, and therefore the outer cylinder 14 can be rotated without applying a large force. As a result, the writing instrument 1 (pen tip component 2) allows for easy adjustment of the outer cylinder 14. In addition, since the pen tip 11, pen feed 12, and ink tank 17 are fixed to the inner cylinder 13, when adjusting the outer cylinder 14, the user only needs to grasp the inner cylinder 13, rotate the fixing device 15, and then slide and rotate the outer cylinder 14. Therefore, when adjusting the outer cylinder 14, it is possible to prevent ink from adhering to the user's fingers.

[0056] Furthermore, since the writing instrument 1 and nib parts 2 allow for the attachment and detachment of the outer cylinder 14, fixing device 15, barrel 16, and ink tank 17 to the inner cylinder 13, only the necessary parts can be cleaned, for example, during maintenance or when changing ink colors. Therefore, the writing instrument 1 and nib parts 2 can prevent liquid from entering between parts and prevent liquid residue from remaining during cleaning.

[0057] The writing instrument 1 and the pen tip component 2 configured in this way allow for adjustment of the circumferential position of the outer cylinder 14, which is the grip portion, relative to the writing portion 22.

[0058] It should be noted that the present invention is not limited to the above embodiments. For example, in the above-described example, the guide portion 41 is configured to have two identically shaped recesses 41a, 41a at two locations in the circumferential direction on the outer surface of the outer cylinder 14, but the invention is not limited to this. For example, the two recesses 41a, 41a may be configured such that one recess 41a is for the thumb and the other recess 41a is for the index finger, allowing contact between the thumb and index finger. Furthermore, an outer cylinder 14 having a guide portion 41 with one recess 41a for the thumb and the other recess 41a for the index finger can be either for right-handed or left-handed users. Furthermore, for example, if the outer cylinder 14 has guide portions 41 with one recess 41a set for the thumb and the other recess 41a set for the index finger, the diameter of the inner circumferential surface at both ends may be made larger than that of other parts, and multiple grooves 42 may be provided at both ends. This configuration allows the outer cylinder 14 to be changed for right-handed and left-handed use by reversing the orientation of the ends in the axial direction.

[0059] Furthermore, while the above example shows an example of the number of multiple protrusions 33 and multiple grooves 42, the number of multiple protrusions 33 and multiple grooves 42 can be set as appropriate. For example, by increasing the number of multiple grooves 42, the angle at which the circumferential position of the outer cylinder 14 relative to the writing section 22 of the pen tip 11 can be adjusted can be reduced, allowing for more detailed adjustments.

[0060] Furthermore, although the above example describes a configuration in which multiple protrusions 33 are provided on the outer circumferential surface of the inner cylinder 13 and multiple grooves 42 are provided on the inner circumferential surface of the outer cylinder 14, the configuration is not limited to this. For example, multiple protrusions 33 may be provided on the end face of the seat portion 31 of the inner cylinder 13, and multiple grooves 42 may be provided on the end face of the outer cylinder 14 facing the seat portion 31.

[0061] Furthermore, as another embodiment, the writing instrument 1 and the pen tip component 2 may be configured, in addition to the configuration of the embodiment described above, to include a packing 18 for preventing loosening between the seat portion 31 of the inner cylinder 13 and one end of the outer cylinder 14, and between the other end of the outer cylinder 14 and the end of the fixing device 15, as shown in Figure 8.

[0062] Furthermore, if a packing 18 is provided, the friction of the packing 18 can restrict the circumferential movement of the outer cylinder 14. For example, as shown in Figure 9, the inner cylinder 13 may not have multiple protrusions 33, and the outer cylinder 14 may not have multiple grooves 42. With such a writing instrument 1 (pen tip component 2), the outer cylinder 14 can be rotated in the circumferential direction of the inner cylinder 13 to adjust the position of the pen tip 11 relative to the writing part 22, and then the fixing device 15 can be tightened to restrict the axial and circumferential movement of the outer cylinder 14. Therefore, with such a writing instrument 1 (pen tip component 2), the circumferential position of the outer cylinder 14 relative to the inner cylinder 13 can be adjusted steplessly, and even more detailed position adjustment of the outer cylinder 14 becomes possible.

[0063] Furthermore, in the example described above, the writing instrument 1 has a fixing device 15 and a barrel 16, and the fixing device 15 and barrel 16 are screwed into the male threaded portion 32 of the inner cylinder 13. However, the invention is not limited to this configuration, and the open end of the barrel 16 may function as the fixing device. That is, the fixing device 15 may not be provided, and the barrel 16 may be used as the fixing device. For example, the barrel 16 as a fixing device may have a projection 52 at its open end so that the end of the barrel 16 abuts against the end of the outer cylinder 14 in the axial direction, and the outer cylinder 14 is supported in the radial direction.

[0064] Furthermore, although the above example describes a configuration in which a projection 52 is provided on the fixing device 15 or the body 16 to support the outer cylinder 14 in the radial direction, the configuration is not limited to this, and the outer cylinder 14 may be supported radially by the inner cylinder 13 by reducing the radial clearance between the inner cylinder 13 and the outer cylinder 14, or by providing a supporting projection on the inner circumferential surface of the outer cylinder 14.

[0065] Furthermore, as mentioned above, the writing instrument 1 (nib part 2) only needs to have a writing direction defined in the writing section 22 of the nib 11, and the position of the guide section 41 that guides the finger position of the outer barrel 14, which is the grip section, relative to the writing section 22 of the nib 11 is adjustable. The writing instrument 1 (nib part 2) is not limited to fountain pens and can be applied to various writing instruments.

[0066] Furthermore, even if there is no writing direction specified for the writing section 22 of the pen tip 11, the above-described configuration can be applied to adjust the position of the outer cylinder 14 circumferentially relative to the inner cylinder 13. Such a writing instrument is effective, for example, when the inner cylinder 13 and outer cylinder 14 have a continuous design and the alignment of this design is required. For example, such a design could be a decorative design. Another example of such a design is to provide arrows or dots on the outer surface of the seat portion 31 of the inner cylinder 13, and to indicate the ink color on the outer cylinder 14, thereby displaying information indicating the ink color by aligning the positions of the inner cylinder 13 and outer cylinder 14 with the corresponding ink positions.

[0067] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. [Explanation of Symbols]

[0068] 1...Writing instrument, 2...Pen nib parts, 11...Pen nib, 12...Pen feed, 13...Inner cylinder, 14...Outer cylinder, 15...Fixing device, 16...Barrel, 17...Ink tank, 18...Gasket, 21...Pen body, 22...Writing section, 23...Pen point, 24...Heart-shaped hole, 25...Slit, 31...Base, 32...Male screw part, 33...Protrusion, 34...Fixing part, 41...Guide part, 42...Groove, 51...Female screw part, 52...Protrusion, 61...Female screw part, 100...Paper sheets, 100a...Paper surface.

Claims

1. A pen tip having a writing section and a writing direction defined by the writing section, A cylindrical inner cylinder that secures the aforementioned pen tip, A cylindrical outer cylinder into which the inner cylinder can be inserted, having a finger guide portion on its outer surface, A fixing device for securing the outer cylinder to the inner cylinder, A body fixed to the inner cylinder, Equipped with, The inner cylinder has a seat portion formed on one end that abuts against one axial end of the outer cylinder, and a male screw portion formed on the other end. The fixing device is formed in a cylindrical shape that abuts against the other end of the outer cylinder, and has a female threaded portion on its inner circumferential surface that screws into the male threaded portion, and the female threaded portion screws into the male threaded portion and abuts against the other end of the outer cylinder in the axial direction, thereby restricting the axial movement of the outer cylinder. The inner cylinder has a plurality of projections formed on a part of its outer circumferential surface facing the outer cylinder between the seat portion and the male screw portion, and arranged in the circumferential direction. A writing instrument having a plurality of recesses arranged in the circumferential direction, where the plurality of projections are located, formed on the inner circumferential surface in a portion facing the plurality of projections, and which engage with the plurality of projections in the circumferential direction when the movement of the outer cylinder is restricted by the fixing device.

2. The writing instrument according to claim 1, wherein the plurality of protrusions and the plurality of recesses extend along the axial direction.

3. The number of the protrusions is less than the number of the recesses. The writing instrument according to claim 2, wherein the recesses are arranged at equal intervals in the circumferential direction.

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