CN110958946B - Pressurized writing instrument - Google Patents

Abstract

Providing a pressurized writing instrument comprising: in a pressure writing instrument capable of applying pressure to the rear end of ink in an ink cartridge by a pen pressure, the pressure can be adjusted in the ink cartridge in accordance with the preference of a user by rotating a rotating body, and the amount of protrusion of the tip end of a ballpoint pen refill that protrudes from the tip end of a barrel when the rotating body rotates is kept constant. A pressurized writing instrument (1) comprises: a shaft tube (4) which can accommodate therein a refill (8) filled with an ink composition (11) for a writing instrument; a pressurizing mechanism (7) for applying pressure to the writing instrument ink composition (11) along with the backward movement of the pen core (8); and a pressurizing force adjusting mechanism (24) for adjusting the pressure.

Description

Pressurized writing instrument

Technical Field

The present invention relates to a pressurized writing instrument that applies pressure to an ink composition for a writing instrument in an ink cartridge.

Background

Conventionally, as such a pressure writing instrument, for example, as disclosed in JP2000-335173A, there is known a structure in which: a pressurizing mechanism is provided at the rear end of the ink accommodating tube, and the ink accommodating tube is pressurized in conjunction with the pressing operation of the pushing body, thereby increasing the ink discharge amount from the writing tip portion and improving the writing width or writing density.

However, in the pressure writing instrument such as JP2000-335173A, since the pressure applied to the ink containing tube is not changed after the pressure mechanism is operated, the writing width and the writing density may not necessarily be suitable for the user's preference.

As a technique for solving this problem, JPH08-141482A discloses an application tool capable of arbitrarily adjusting the pressure applied to the rear end of the correction fluid in the fluid tank.

The coating tool of JPH08-141482A had the following structure: the rotating body at the rear end of the shaft tube is rotated in stages from the pressing start point of the tank pushing portion at the inner end of the tube toward the pressing end point, whereby the rear end of the liquid tank is pushed forward of the shaft tube in accordance with the height of the pressurizing portion of each stage, and the liquid tank is compressed in stages.

However, in the structure of JPH08-141482A, although the inside of the liquid tank can be pressurized with an arbitrary strength during use, the pressurizing force needs to be adjusted every time the rotating body is rotated during use, and further, there is a risk that the liquid leaks from the liquid application port in a pressurized state when the use is suspended.

On the other hand, JP2011-235612a discloses a so-called pen pressure type ball-point pen in which a pressurizing mechanism is operated by a pen pressure at the time of writing to bring a writing liquid containing tube into a pressurized state.

The pen-pressure-type ball-point pen described in JP2011-235612a has the following structure: since the ball-point pen refill is moved backward by the pressure during writing and the pressurizing mechanism is operated to apply pressure to the rear end of the ink, it is necessary to increase or decrease the width of the ball-point pen refill that is moved backward when the pressure is applied in order to adjust the pressure applied to the rear end of the ink during pressurizing as in JPH08-141482A, and accordingly, it is difficult to make the length of the tip portion of the ball-point pen refill projected from the barrel constant.

However, although the grip position of a ball-point pen varies depending on the person, the grip position is often determined based on the position of the pen tip during writing. Therefore, the following problems arise: the user has to change the position of the grip cylinder depending on the length of the pen tip, and particularly when the grip portion of the writing instrument is formed with an anti-slip projection or is formed by bending toward the inside or outside so as to be easily gripped, the grip feeling changes when the grip position is changed.

The pressure writing tool of JP2009-202513a is configured as follows: the pressurizing mechanism includes a cylinder having an air hole at a rear end portion for communicating the inside and the outside, and a sealing member made of a bottomed cylinder attached to an inner wall of the pushing body, and the rear end portion of the cylinder is pressed against the inner wall of the sealing member with a bottom by advancing the pushing body to seal the air hole of the cylinder, and further, the air in the sealed cylinder is compressed by advancing the cylinder to apply a pressure to a space at the rear end portion of the ink cartridge.

In addition, in general, in a pressurized writing instrument, when the pressurized state is released, it is necessary to return the sealed space to the original state by a compressed amount. Therefore, when the pressure in the pressurized space reaches near atmospheric pressure due to consumption of ink or the like at the time of releasing the pressurized space, a negative pressure state is established in which the atmospheric pressure is lower than the atmospheric pressure, and the writing instrument ink filled in the ink cartridge moves to the rear end side of the ink cartridge, and there is a possibility that a reverse flow of the ink occurs. As a countermeasure, in the pressure writing instrument of JP2009-202513a, the following structure is provided: the pusher is biased rearward by a coil spring, and when the pressurized state of the pressurizing mechanism is released, the sealing between the cylinder and the sealing member is released by the biasing force of the coil spring, and the air hole of the cylinder is opened to make the pressure in the cylinder and the rear end portion of the ink container equal to the atmospheric pressure, and then the cylinder is retracted, thereby preventing the negative pressure state in which the atmospheric pressure is lower than the atmospheric pressure when the sealed space is released.

The pen-pressure-type ball-point pen described in JP2011-235612a has the following structure: when writing, the ball-point pen refill is retracted by the pressure of the pen, the pressurizing mechanism is operated to apply pressure to the trailing end of the ink, and when writing, the writing tip portion repeatedly comes into contact with and separates from the paper surface or the like, thereby switching between the pressurized state and the non-pressurized state. Therefore, when the ballpoint pen refill is largely retracted during writing, it is very difficult to perform writing, and therefore, it is necessary to minimize the retraction amount of the ballpoint pen refill during writing. Accordingly, as in the case of a push-type pressing writing instrument such as JP2009-202513a, since a high pressure cannot be applied to the inside of the pressure chamber by advancing the pusher by a long stroke, the pressure applied by the pressing mechanism is also small as compared with the push-type writing instrument. In addition, in the pen pressure type, since the pressurized state of the pressurizing chamber is reset every time the writing tip portion is separated from the paper surface, the pressure that can be pressurized by 1 compression is low, but there is an advantage that writing can be performed while maintaining a substantially constant pressurized state.

However, in the structure of JP2011-235612A, the pressure applied to the pressurizing chamber is lowered every time the pressurized state of the pressurizing chamber is reset at the time of writing, and therefore, the negative pressure state generated at the time of pressurizing reset is extremely small even in 1 operation, but the number of times the pressurized state is reset at the time of writing is large as compared with the push-type pressurized writing tool such as JP2009-202513a, and therefore, air is easily drawn into the ball-point pen core from the writing end portion, and finally, there is a possibility that the ink flows backward and writing is not possible.

Disclosure of Invention

The present invention has been made in view of the above problems, and it is a 1 st object of the present invention to provide a pressing type writing instrument: in a pressure writing instrument capable of applying pressure to the rear end of ink in an ink cartridge by a pen pressure, the pressure can be adjusted in the ink cartridge in accordance with the preference of a user by rotating a rotating body, and the amount of protrusion of the tip end of a ballpoint pen refill that protrudes from the tip end of a barrel when the rotating body rotates is kept constant.

Another object of the present invention is to provide a pressing type writing instrument, comprising: in a pressure type writing instrument capable of applying pressure to the rear end of ink in an ink storage tube by pen pressure, when a writing tip part is separated from a writing surface and the pressure applied to the rear end of ink is released during writing, a negative pressure state in which the air pressure in a pressure chamber is lower than the atmospheric pressure is prevented, and backflow of ink can be prevented.

The pressure writing instrument of the present invention comprises: a shaft tube capable of accommodating therein a refill filled with an ink composition for a writing instrument; a pressurizing mechanism that applies pressure to the writing instrument ink composition as the pen core retreats; and a pressure adjustment mechanism that adjusts the pressure.

In the pressure writing instrument according to the present invention, the pressure writing instrument may further include a rotor provided so as to protrude from a rear end of the barrel, and the pressurizing force adjusting mechanism may adjust the pressure by rotating the rotor.

The invention provides a pressure type writing instrument comprising a ball-point pen refill which has an ink container filled with an ink composition for a writing instrument and which has a ball-point pen tip at the front of the ink container, and a pressure mechanism which is disposed at the rear of the ball-point pen refill and which applies pressure to the rear end of the ink composition for a writing instrument by retracting the ball-point pen refill by applying a pressure, wherein a rolling member which protrudes from the rear end of the barrel and is locked to the barrel so as to be movable forward and backward and so as not to be rotatable and a pressurizing force adjusting mechanism which adjusts the retraction amount of the ball-point pen refill by rotating the rolling member are provided at the rear of the pressure mechanism, the pressurizing force adjusting mechanism is operated by rotating the rotating body to adjust the pressurizing force applied to the rear end of the writing instrument ink composition in the ink cartridge, and the relative position of the ballpoint pen refill with respect to the shaft barrel in the axial direction does not change before and after the rotating body is rotated.

In the pressure writing instrument according to the present invention, a slide member may be disposed inside the shaft tube, the slide member being locked to the shaft tube so as to be movable forward and backward and unrotatable, the slide member including: the pressurizing mechanism is arranged on the inner side of the sliding component; and the rolling member, it is disposed into a part and is projected from the rear end opening of the slide member backward, through pressing the said rolling member forward, the front end of the said ball pen refill is projected from the front end opening of the said axle tube.

In the pressurized writing instrument according to the present invention, the pressurizing force adjusting mechanism may include: the sliding component; a rotating body inserted from a front end opening of the sliding member and locked to the sliding member so as to be rotatable and movable forward and backward; and a sliding member that is disposed inside the rotating body and is locked to the rotating body so as to be rotatable and movable forward and backward, wherein a first cam mechanism that moves the rotating body forward and backward with respect to the sliding member is provided between the sliding member and the rotating body, and a second cam mechanism that moves the sliding member forward and backward with respect to the rotating body is provided between the rotating body and the sliding member.

In the pressure writing instrument according to the present invention, the first cam mechanism may have a first cam slope inclined with respect to the axial direction and extending in the axial circumferential direction on an inner surface of the slide member, the first cam protrusion formed to be in sliding contact with the first cam slope on an outer surface of the rotating body, the second cam mechanism may have a second cam slope inclined with respect to the axial direction and extending in the axial circumferential direction on an outer surface of the slide member, and the second cam protrusion formed to be in sliding contact with the second cam slope on an inner surface of the rotating body.

In the pressurized writing instrument according to the present invention, the pressurizing mechanism may include: a cylindrical body having a through hole penetrating in the front-rear direction; an elastic member disposed inside the cylindrical body, a rear end portion of the ballpoint pen refill being detachably attached to the elastic member; a pressurizing chamber formed between an inner wall of the elastic member and a rear end portion of the ink containing cylinder and communicating with an inside of a rear end opening portion of the ink containing cylinder; a fixing member disposed inside the cylindrical body and behind the elastic member; and an air hole that communicates the pressurizing chamber with the outside, wherein the cylindrical body is locked to a slide member so as to be movable forward and backward and unrotatable, wherein the slide member is locked to the cylindrical body so as to be movable forward and backward and unrotatable, wherein an urging member is provided between a rear inner step portion of the cylindrical body and a front inner step portion of the slide member, wherein the cylindrical body is urged forward with respect to the slide member, and wherein the cylindrical body retreats together with the ballpoint pen refill, whereby the elastic member is deformed by the abutment of the elastic member with the anchor, and the pressurizing chamber is compressed, thereby applying pressure to a rear end of the ink in the ink containing cylinder.

According to the present invention, there can be provided a pressure writing instrument: in a pressure writing instrument capable of applying pressure to the rear end of ink in an ink container by a pen pressure, the pressure applied in the ink container can be adjusted according to the preference of a user by rotating a rotating body, and the amount of protrusion of the tip end of a ballpoint pen refill from the tip end of a barrel when the rotating body is rotated is kept constant.

A pressure-type writing instrument according to the present invention is a pressure-type writing instrument in which a ballpoint pen refill having an ink cartridge filled with an ink composition for a writing instrument and having a ballpoint pen tip at a front portion of the ink cartridge is housed in a barrel, and a pressure mechanism that applies pressure to a rear end of the ink composition for a writing instrument by retracting the ballpoint pen refill by applying a pen pressure is disposed at a rear portion of the ballpoint pen refill, wherein the pressure mechanism includes: a cylinder formed in a cylindrical shape; an airtight valve having an airtight deformation portion on an outer peripheral surface thereof and formed to be movable forward and backward with respect to the cylinder; a piston which is assembled to a rear inner hole of the cylinder body in a freely movable manner forward and backward; an airtight member disposed between the piston and the cylinder; a pressurizing chamber surrounded by the cylinder, the airtight valve, the piston, and the airtight member, and communicating with a rear portion of the ballpoint pen refill; and an urging member disposed between the airtight valve and the piston, for urging the airtight valve forward, wherein when a writing pressure is applied to a tip end of the ballpoint pen tip, the ballpoint pen refill retreats, and the cylinder and the airtight valve retreat with respect to the piston against an elastic force of the urging member in conjunction with the retreat of the ballpoint pen refill, and compress and pressurize the pressurizing chamber after sealing the pressurizing chamber, and after the writing pressure to the ballpoint pen refill is released, the airtight valve advances with respect to the piston before the cylinder, thereby forming an air passage for communicating the pressurizing chamber and the outside, and the airtight state of the pressurizing chamber is released to become an air pressure equal to an atmospheric pressure, and then the cylinder advances with a delay.

In the pressure writing instrument according to the present invention, when a pressure is applied to the distal end of the ballpoint pen refill, the airtight deforming portion of the airtight valve and the abutting portion of the cylinder abut against each other, thereby bringing the inside of the pressure chamber into an airtight state, and when the pressure applied to the ballpoint pen refill is released, the fitting force generated between the piston and the cylinder by the airtight member is larger than the fitting force generated between the abutting portion of the airtight valve and the cylinder by the airtight deforming portion of the airtight valve, thereby advancing the airtight valve relative to the piston prior to the cylinder.

According to the present invention, there can be provided a pressure writing instrument: in a pressure type writing instrument capable of applying pressure to the rear end of ink in an ink container by pen pressure, when the rear end portion of a ballpoint pen tip is separated from a writing surface and the pressure applied to the rear end of the ink is released, a negative pressure state in which the air pressure in a pressure chamber is lower than the atmospheric pressure can be prevented, and backflow of the ink can be prevented.

In the pressurized writing instrument according to the present invention, the pressurized writing instrument may further include a pressurizing force adjusting mechanism that adjusts the pressure.

In the pressure writing instrument according to the present invention, the pressure writing instrument may further include a rotor provided so as to protrude from a rear end of the barrel, and the pressurizing force adjusting mechanism may adjust the pressure by rotating the rotor.

In the pressure writing instrument of the present invention, the writing instrument ink composition may be a thermochromic ink, and the pressure writing instrument may further include: a friction body provided at a rear end of the rotation body, and capable of rubbing the handwriting of the thermochromic ink and changing the color of the handwriting by using frictional heat generated at the time; and a stopper member that allows rotation of the rotating body in a state where the rear end of the shaft tube is directed upward, and that blocks rotation of the rotating body in a state where the rear end of the shaft tube is directed downward.

Drawings

Fig. 1 is a longitudinal sectional view of a pressurized writing instrument of embodiment 1.

Fig. 2 is an enlarged longitudinal sectional view of a main portion of fig. 1.

Fig. 3 is an exploded view for explaining the pressurizing mechanism and the pressurizing force adjusting mechanism according to embodiment 1.

Fig. 4 is an enlarged sectional view taken along line IV-IV in fig. 2.

Fig. 5 is an enlarged sectional view taken along line V-V of fig. 2.

Fig. 6 is a longitudinal sectional view showing a pushing state where the rotating body is pushed from the state of fig. 1.

Fig. 7 is an explanatory view showing a state when writing is performed by the pressure writing instrument of fig. 6.

Fig. 8 is an explanatory diagram showing a state in which a pen pressure is applied along the axial center from the state of fig. 7.

Fig. 9A is an explanatory diagram showing an operation of the pressure writing instrument when the pen pressure is applied, and shows a state before the pen pressure is applied.

Fig. 9B is an explanatory diagram illustrating an operation of the pressure writing instrument when the pen pressure is applied, and illustrates a state in which the pen pressure is applied to make the pressurized space airtight.

Fig. 9C is an explanatory diagram illustrating an operation of the pressure writing instrument when a pen pressure is applied, and illustrates a state in which the pen pressure is applied to pressurize the pressurizing space.

Fig. 10A is an explanatory view showing an operation when the rolling body of the pressing type writing instrument is rotated, and shows a state where the pressing force is set to be high.

Fig. 10B is an explanatory view showing an operation when the rolling body of the pressing type writing instrument is rotated, and shows a state where the pressing force is set to be low.

Fig. 10C is an explanatory view showing an operation when the rolling body of the pressing type writing instrument is rotated, and shows a state in which the pressing force is set not to be applied.

Fig. 11A is an explanatory view for explaining a fitting state of the cam of the first pressing mechanism when the rotary body of the pressing type writing instrument is rotated, and shows the fitting state of the cam in the pressing type writing instrument shown in fig. 10A.

Fig. 11B is an explanatory view for explaining a fitting state of the cam of the first pressing mechanism when the rotary body of the pressing type writing instrument is rotated, and shows the fitting state of the cam in the pressing type writing instrument shown in fig. 10B.

Fig. 11C is an explanatory view for explaining a fitting state of the cam of the first pressing mechanism when the rotary body of the pressing type writing instrument is rotated, and shows the fitting state of the cam in the pressing type writing instrument shown in fig. 10C.

Fig. 12A is an explanatory view for explaining a fitting state of the cam of the second pressing mechanism when the rotary body of the pressing type writing instrument is rotated, and shows the fitting state of the cam in the pressing type writing instrument shown in fig. 10A.

Fig. 12B is an explanatory view for explaining a fitting state of the cam of the second pressing mechanism when the rotary body of the pressing type writing instrument is rotated, and shows the fitting state of the cam in the pressing type writing instrument shown in fig. 10B.

Fig. 12C is an explanatory view for explaining a fitting state of the cam of the second pressing mechanism when the rotary body of the pressing type writing instrument is rotated, and shows the fitting state of the cam in the pressing type writing instrument shown in fig. 10C.

Fig. 13 is a side view showing a modification of the pressure writing instrument of embodiment 1.

Fig. 14 is an external view showing a pressurized writing instrument according to embodiment 2.

Fig. 15 is a longitudinal sectional view showing the pressing type writing instrument of embodiment 2.

Fig. 16 is an enlarged longitudinal sectional view of a main portion of fig. 15.

Fig. 17 is an exploded view for explaining the pressurizing mechanism and the pressurizing force adjusting mechanism according to embodiment 2.

Fig. 18 is an enlarged sectional view taken along line XVIII-XVIII in fig. 16.

Fig. 19 is an enlarged sectional view taken along line XIX-XIX in fig. 16.

Fig. 20 is a longitudinal sectional view showing a pushing state in which the rotating body is pushed from the state of fig. 15.

Fig. 21 is an explanatory view showing a state when writing is performed by the pressure writing instrument of fig. 20.

Fig. 22 is an explanatory view showing a state in which a pen pressure is applied along the axial center from the state of fig. 21.

Fig. 23 is an enlarged longitudinal sectional view of a main portion of fig. 21.

Fig. 24 is an enlarged longitudinal sectional view showing a state where pen pressure is applied from the state of fig. 23.

Fig. 25 is an enlarged longitudinal sectional view showing a state from the state of fig. 24 until the last by applying pen pressure.

Fig. 26 is an enlarged vertical cross-sectional view showing a state in which an air passage is formed by releasing the pen pressure from the state of fig. 25.

Fig. 27A is an explanatory view showing an operation when the rolling body of the pressure writing instrument is rotated in embodiment 2, and shows a state where the applied pressure is set to be high.

Fig. 27B is an explanatory view showing an operation when the rolling body of the pressure writing instrument is rotated in embodiment 2, and shows a state where the applied pressure is set to be low.

Fig. 27C is an explanatory view showing an operation when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows a state where the pressure is set not to be applied.

Fig. 28A is an explanatory view for explaining a fitting state of the cam of the first cam mechanism when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows the fitting state of the cam in the pressure writing instrument shown in fig. 27A.

Fig. 28B is an explanatory view for explaining a fitting state of the cam of the first cam mechanism when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows the fitting state of the cam in the pressure writing instrument shown in fig. 27B.

Fig. 28C is an explanatory view for explaining a fitting state of the cam of the first cam mechanism when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows the fitting state of the cam in the pressure writing instrument shown in fig. 27C.

Fig. 29A is an explanatory view for explaining a fitting state of the cam of the second cam mechanism when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows the fitting state of the cam in the pressure writing instrument shown in fig. 27A.

Fig. 29B is an explanatory view for explaining a fitting state of the cam of the second cam mechanism when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows the fitting state of the cam in the pressure writing instrument shown in fig. 27B.

Fig. 29C is an explanatory view for explaining a fitting state of the cam of the second cam mechanism when the rotary body of the pressure writing instrument is rotated in embodiment 2, and shows the fitting state of the cam in the pressure writing instrument shown in fig. 27C.

Fig. 30 is a partial longitudinal cross-sectional view showing a modification of the pressure writing instrument of embodiment 2.

Fig. 31 is a view showing the pressure writing instrument in a cross section corresponding to the line XXXI-XXXI of fig. 30.

Fig. 32 is an exploded view showing respective members constituting the pressing mechanism and the pressing force adjusting mechanism of the pressing type writing instrument of fig. 30.

Fig. 33 is a longitudinal sectional view showing the rotating body of fig. 30 in an enlarged manner.

Fig. 34 is a diagram for explaining a method of erasing handwriting using the pressure writing instrument of fig. 30.

Fig. 35 is a view showing the pressure writing instrument in a cross section corresponding to the line XXXV-XXXV of fig. 34.

Detailed Description

The present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments and modifications.

In the present specification, in the longitudinal direction of the shaft, one side where the ballpoint pen tip is present is referred to as a front side, and the opposite side is referred to as a rear side. Accordingly, a direction along the longitudinal direction of the shaft tube may be referred to as a front-rear direction. Further, the movement in the front-rear direction is sometimes expressed as a front-rear movement. Further, in the axial diameter direction of the shaft tube, one side where the ballpoint pen refill is present is referred to as an inner side, and the opposite side is referred to as an outer side.

For ease of understanding of the description, the same components and the same portions in the drawings are denoted by the same reference numerals.

[ 1 st embodiment ]

The pressing type writing instrument 1 of the present embodiment includes a barrel 4, a pressing mechanism 7, and a pressing force adjusting mechanism 24. The barrel 4 is configured to be able to accommodate therein a refill 8 filled with ink 11 which is an ink composition for a writing instrument. The pressurizing mechanism 7 is a mechanism that applies pressure to the ink 11. The pressure writing instrument 1 is configured to be capable of switching between a writing state in which the tip end portion of the pen core 8 protrudes from the tip opening 3a of the barrel 4 and a non-writing state in which the tip end portion of the pen core 8 is retracted from the tip opening 3a of the barrel 4. In the pressure writing instrument 1 shown in fig. 1 to 5, a shaft tube 4 is formed by screwing a front shaft 3 in front of a rear shaft 2, and is composed of a slide member 5 disposed in the shaft tube 4 so as to be movable forward and backward, a rotor 6 rotatably locked to the slide member 5, a pressure mechanism 7 disposed in the slide member 5, a refill (ball point pen refill) 8 mounted to the pressure mechanism 7 and slidable forward and backward in the shaft tube 4, and a clip 9 rotatably locked to a side surface of the rear shaft 2.

The ballpoint pen refill 8 is obtained by: an ink 11 as an ink composition for a writing instrument and a grease-like ink follower 12 which follows the rear end of the ink 11 as the ink is consumed are directly stored in a transparent ink storage tube 10 made of a PP resin, and a ball is press-fitted into an opening at the front end of the ink storage tube 10 so as to be rotatable

The rear end portion of the ballpoint pen tip 13 in (2) is press-fitted with a cylindrical tail plug 14 in the rear end opening of the ink cartridge 10.

The tail plug 14 has a through hole formed therein and penetrating in the front-rear direction, and a mounting portion 14a is formed by providing a stepped portion at the rear.

As shown in fig. 1, the front shaft 3 (the shaft tube 4) has a front end opening 3a at the front end through which the ballpoint pen tip 13 of the ballpoint pen refill 8 can protrude. Further, an inner step portion 3b is formed on the inner peripheral surface of the rear portion.

The rear shaft 2 (the shaft tube 4) is formed in a tubular shape, and as shown in fig. 2, a side hole 2b extending in the axial direction and penetrating to the inner hole is formed in the outer surface 2 a. Further, a clip locking portion 2c protruding outward is formed on the outer surface 2a, and the clip locking portion 2c is composed of a clip locking projection 2d and a spring locking projection 2 e. Then, the clip locking projection 2d is formed with a locking hole 2f in a direction perpendicular to the axial direction.

Further, a locking rail portion 2g protruding inward and extending forward and backward is formed on the rear inner circumferential surface of the rear shaft 2.

As shown in fig. 2 to 4, the slide member 5 has a hooking portion 5a formed on an outer peripheral portion thereof so as to protrude outward, and the hooking portion 5a is disposed in the side hole 2b of the rear axle 2. Further, an engagement groove 5d extending in the axial direction is formed in the outer surface of the rear portion of the slide member 5, and the slide member 5 is engaged in a manner slidable back and forth relative to the rear shaft 2 and unrotatable by fitting the engagement groove 5d to the engagement rail portion 2g of the rear shaft 2.

Further, a front inner protrusion 5b having a protrusion shape protruding inward is formed in a front inner hole of the slider 5, and an inner step portion 5c having a small inner diameter is formed in a rear portion of the slider 5.

Further, slits 5e extending rearward from the front end are formed in the side surface of the slider 5, and the slits 5e are formed symmetrically at 2 locations with the axis therebetween. Further, a first cam slope 5f formed obliquely in the axial circumferential direction and projecting inward is formed on the inner surface of the slide member 5, and a plurality of step portions 5g are formed on the first cam slope 5 f. Further, the plurality of step portions 5g are respectively formed with recessed portions 5h formed in a recessed shape toward the rear.

A cylindrical spacer 15 is disposed in front of the slide member 5, and a rear step portion 15a is formed in a rear portion of the spacer 15. Further, the front inner projection 5b of the slide member 5 is press-fitted into the rear step portion 15a, whereby the spacer ring 15 is non-detachably attached to the slide member 5.

Further, as shown in fig. 1, the thrust coil spring 16 is stretched in a compressed state between the inner step portion 3b formed on the inner surface of the front shaft 3 (the shaft tube 4) and the front end portion 15b of the spacer 15, whereby the slide member 5 is urged rearward with respect to the front shaft 3 (the shaft tube 4) via the spacer 15.

As shown in fig. 1, 2, 4, and 5, the clip spring 17 is disposed between the spring locking projection 2e of the rear shaft 2 and the inner projection 9a formed in the inner wall portion of the clip 9 so as to project toward the shaft tube 4 side, and the locking shaft portion 9b formed in the inner wall of the clip 9 is locked in the locking hole 2f, whereby the clip 9 is erected so that the distal end portion of the clip 9 is always pushed toward the outer wall surface side of the rear shaft 2. Further, the movable clip is configured as follows: by pressing the rear end portion of the clip 9 (in the direction of arrow G in fig. 2), the distal end portion of the clip 9 can be separated from the outer wall surface of the rear axle 2 with the clip 9 and the locking shaft R of the rear axle 2 as a fulcrum.

Further, a hooked portion 9c is formed at the front portion of the clip 9, and the hooked portion 9c extends from the base portion 9d toward the shaft tube 4 and hooks with a hooking portion 5a formed on the side surface of the slide member 5.

The pressurizing mechanism 7 is a mechanism that applies pressure to the ink 11 as the pen core 8 retreats. As shown in fig. 1 to 3, the pressurizing mechanism 7 is housed in the rear of the ballpoint pen refill 8 and inside the slide member 5 so as to be movable forward and backward with respect to the slide member 5, and the pressurizing mechanism 7 is composed of: a cylindrical body 18 formed in a cylindrical shape; a mount 19 attached to the tubular body 18 so as to be movable forward and backward; an elastic member 20 press-fitted to the inner peripheral portion of the cylindrical body 18 and detachably fitted to the rear end portion of the ballpoint pen refill 8; and a pressurizing space (pressurizing chamber) 21 formed inside the elastic member 20 and communicating with the rear inner hole 8a of the ballpoint pen refill 8.

The pressing mechanism 7 is configured such that the front end of the tubular body 18 abuts the rear end of the spacer 15 to restrict the forward movement of the pressing mechanism 7.

Describing the cylindrical body 18 in detail, as shown in fig. 2 and 3, the cylindrical body 18 includes a through hole 18a penetrating in the front-rear direction and having a plurality of stepped portions, and an engaging projection 18b projecting outward is formed on the outer peripheral portion. The cylindrical body 18 has an outer stepped portion 18c formed on the outer periphery thereof, and the outer diameter of the rear portion is smaller than that of the front portion.

Further, rear end convex portions 18d protruding rearward are formed at 2 locations across the axial center at the rear end of the tubular body 18.

As shown in fig. 5, the locking projection 18b of the tubular body 18 is inserted into a slit 5e formed in the side surface of the slide member 5, whereby the tubular body 18 is locked to the slide member 5 so as to be movable forward and backward and unrotatable.

To describe the fixing member 19 in detail, as shown in fig. 1 to 3 and 5, a flange 19a is formed at the front end of the fixing member 19, and two engaging portions 19b protruding outward are formed at the rear end. Further, a slit 19c extending forward from the rear end is formed between the two locking portions 19 b.

When the fixing member 19 is attached to the tubular body 18, the flange portion 19a abuts against an inner step of the through hole 18a formed in the tubular body 18 to restrict the movement of the fixing member 19 in the rearward direction, and further, a plurality of air passages 19e in the form of grooves extending in the axial direction are uniformly arranged in the axial circumferential direction on the side surface of the fixing member 19, and the state in which the middle hole portion 18f and the rear hole portion 18g of the through hole 18a of the tubular body 18 are always in air communication is maintained by the air passages 19 e.

Referring to the elastic member 20 in detail, as shown in fig. 2 and 3, the elastic member 20 is formed of nitrile rubber, and the elastic member 20 has an inner hole 20a penetrating in the front-rear direction.

The elastic member 20 is press-fitted into the front inner surface 18h of the through hole 18a of the tubular body 18, and the mounting portion 14a of the tail plug 14 of the ballpoint pen refill 8 is detachably mounted on the front inner peripheral portion 20b of the inner hole 20 a.

When the elastic member 20 is press-fitted into the front inner surface 18h, a gap is formed between the rear end of the elastic member 20 and the front end surface 19d of the fixed member 19, and the gap is maintained except when a pressure is applied to the ballpoint pen refill 8.

Further, the pressure space (pressure chamber) 21 is formed inside the elastic member 20, and the pressure space 21 communicates with the rear inner hole 8a of the ballpoint pen refill 8.

The pressurizing space 21 communicates with the center hole 18f of the tubular body 18 through the air hole 20c formed in the rear portion of the inner hole 20a, and the center hole 18f communicates with the outside through the rear hole 18g via the air passage 19e, so that the pressurizing space 21 communicates with the outside.

A slide member 22 is disposed behind the tubular body 18, and a second cam slope 22a is formed on a side surface of the slide member 22. Further, a plurality of stepped portions 22b are formed on the second cam slope 22a, and a recessed portion 22c formed in a recessed shape toward the front is formed on each of the plurality of stepped portions 22 b.

Further, a front end concave portion 22d is formed in a front portion of the sliding member 22 so as to be slit-shaped toward the rear and formed at 2 places with the axis therebetween, and the rear end convex portion 18d of the tubular body 18 is inserted into the front end concave portion 22d of the sliding member 22, whereby the sliding member 22 is locked to the tubular body 18 so as to be movable forward and backward and so as not to be rotatable.

Further, by inserting the anchor 19 into the inner hole of the slide member 22 from the front direction, the locking portion 19b of the anchor 19 is projected and locked rearward from the rear end of the slide member 22, whereby the anchor 19 and the slide member 22 are fixed so as not to be attachable and detachable.

When the anchor 19 is inserted into the slide member 22, the 2 locking portions 19b are deflected by the slits 19c and approach toward the axial center side, thereby facilitating insertion of the anchor 19 into the inner hole.

Further, a pressing coil spring 23 is provided between the rear inner step portion 18e of the tubular body 18 and the front inner step portion 22e of the slide member 22, and the tubular body 18 is urged forward relative to the slide member 22 by the pressing coil spring 23.

Here, as shown in fig. 2, the rolling element 6 is inserted into the slide member 5 from the front end opening of the slide member 5, and is partially fitted so as to protrude rearward from the rear opening of the slide member 5.

In the rolling element 6, as shown in fig. 3, a plurality of groove portions 6a are formed along the axial center on the rear outer peripheral surface, and the rolling element 6 is not easily slipped when being held with fingers by the groove portions 6 a.

Further, a convex portion 6b that protrudes outward and is inclined so that the outer diameter increases from the rear to the front is formed in front of the groove portion 6a, and when the rolling body 6 is attached to the slide member 5, the rolling body 6 does not come off from the slide member 5 by the convex portion 6 b.

The rotating body 6 is formed with a first cam projection 6d extending rearward from the front outer peripheral surface 6c and a second cam projection 6f extending forward from the rear inner peripheral surface 6 e.

The first cam mechanism 30 is configured by cam-fitting the first cam projection 6d of the rotating body 6 and the first cam inclined surface 5f of the slide member 5, and the second cam mechanism 40 is configured by cam-fitting the second cam projection 6f of the rotating body 6 and the second cam inclined surface 22a of the slide member 22.

Here, the slide member 5, the rolling member 6, and the slide member 22 constitute a pressurizing force adjusting mechanism 24, and the pressurizing force adjusting mechanism 24 can compress the pressurizing space 21 by rotating the rolling member 6 to change the pressurizing pressure.

Next, a description will be given of a state in which the writing tip of the ballpoint pen refill 8, i.e., the ballpoint pen tip 13, is drawn out and retracted from the front end opening portion 3a of the front shaft 3 by pressing (pushing) the rolling body 6 forward.

When the rolling member 6 is pressed forward from the state of fig. 1 (in the direction of arrow F in fig. 1), the rolling member 6 moves forward relative to the slide member 5, the convex portion 6b abuts against the rear end of the slide member 5, and the slide member 5 pressed by the rolling member 6 and the spacer ring 15 press-fitted to the slide member 5 move forward together with the rolling member 6 against the elastic force of the pushing coil spring 16. At the same time, the rotating body 6 is cam-fitted to the slide member 22, and therefore, the slide member 22 is pushed forward, and the slide member 22 moves forward, and is thereby pushed by the pressing coil spring 23, and the cylindrical body 18 moves forward. Then, the ball-point pen refill 8 is pushed forward via the elastic member 20 as the tubular body 18 advances, and the ball-point pen refill 8 advances, so that the tip portion of the ball-point pen tip 13 protrudes from the tip opening portion 3a of the front shaft 3. At this time, the hooking portion 5a of the slider 5 is hooked on the hooked portion 9c of the distal end portion of the clip 9 disposed on the side surface of the rear shaft 2, and thereby the state of fig. 6 in which the front end of the ballpoint pen tip 13 is kept protruding from the front end opening portion 3a of the front shaft 3 (the shaft tube 4) is maintained.

Here, when the rear end portion of the clip 9 is pressed (in the direction of arrow G in fig. 6) to release the engaged state of the engaging portion 5a of the slide member 5 engaged with the engaged portion 9c of the clip 9, the ball-point pen refill 8, the pressing mechanism 7, the slide member 22, the slide member 5, and the rolling element 6 are moved rearward by the elastic force of the urging coil spring 16, and the state in fig. 1 is returned.

Next, in the present embodiment, a description will be given of a state in which the rear end of the ink 11 in the ballpoint pen refill 8 is pressurized by the writing pressure at the time of writing via the ink follower 12.

As shown in fig. 6 and 9A, when the shaft tube 4 is held in a tilted state as shown in fig. 7 in a state where the tip end of the ballpoint pen tip 13 protrudes from the tip end opening portion 3a of the front shaft 3, and a writing pressure is applied to the tip end of the ballpoint pen refill 8, and the ballpoint pen refill 8 retreats in the arrow H direction of fig. 7, the hooking portion is locked to the hooked portion 9c of the clip 9, and therefore, the slider member 5 cannot retreat, and the rolling member 6 cam-engages with the slider member 5, and therefore cannot retreat, and the slider member 22 cam-engages with the rolling member 6, and therefore, the cylindrical body 18 retreats together with the elastic member 20 against the elastic force of the pressing coil spring 23. When the rear end of the elastic member 20 abuts against the front end surface 19d of the stopper 19 locked and stopped by the slide member 22, the air hole 20c is closed by the front end surface 19d, and the pressurizing space 21 is sealed, which is the state shown in fig. 9B. Further, when the ballpoint pen refill 8 retreats and the cylindrical body 18 retreats, the elastic member 20 elastically deforms, whereby the pressurizing space 21 is compressed as shown in fig. 9C, and the rear end of the ink 11 in the ballpoint pen refill 8 is pressurized via the ink follower 12 in the state of fig. 8. That is, as the ballpoint pen refill 8 retreats, the pressure mechanism 7 applies pressure to the rear end of the ink 11.

Further, the outer step portion 18c of the cylindrical body 18 abuts on the tip end 6g of the rolling body 6, whereby the ball-point pen refill 8 stops moving backward in the arrow H direction based on the pen pressure. That is, the length of the ball-point pen refill 8 that can be retracted can be determined according to the size of the gap between the outer step portion 18c and the tip 6 g.

When the pen pressure is released, the cylindrical body 18 and the elastic member 20 move forward (to the original positions) by the elastic force of the pressing coil spring 23 and the restoring force of the deformed elastic member 20. When the rear end of the elastic member 20 is separated from the front end surface 19d of the anchor 19, the air hole 20c is opened, the pressurization space 21 and the rear inner hole 8c of the ballpoint pen refill 8 are released from the closed state, the pressure becomes the same as the atmospheric pressure, and the state shown in fig. 7 is returned.

Next, the following operations are described: in the pushing state of fig. 6, the pressurizing force adjusting mechanism 24 is operated by rotating the rotor 6 with respect to the rear shaft 2, and the pressurizing force applied to the ink 11 is adjusted.

When the rolling member 6 is rotated in the left direction (counterclockwise) as viewed from the rear end side from the state of fig. 10A to the state of fig. 10B, the sliding member 5 is locked to the rear shaft 2 so as not to be rotatable, and therefore, as shown in fig. 11A to 11B, the first cam protrusion 6d of the rolling member 6 moves from the 1 st step portion 5g1 to the adjacent 2 nd step portion 5g2 along the first cam slope. At this time, the rolling member 6 moves forward by an amount L1 (see fig. 11A) of one step with respect to the first cam projection 6d of the slider 5, and the slider urged rearward by the pressing coil spring 23 also moves forward by an amount L1.

Then, since the slide member 22 is locked to the tubular body 18 so as not to be rotatable and the tubular body 18 is locked to the slide member 5 so as not to be rotatable, the slide member 22 cannot rotate with respect to the shaft tube 4, and the second cam projection 6f of the rotating body 6 moves from the 1 st step portion 22B1 to the adjacent 2 nd step portion 22B2 along the second cam slope 22A of the slide member 22 as shown in fig. 12A to 12B along with the rotation of the rotating body 6. At this time, the slide member 22 moves backward by the amount M1 of one step with respect to the rotating body 6 by the second cam projection 6f (see fig. 12A). Therefore, the slide member 22 advances L1 by the first cam mechanism 30 and retreats M1 by the second cam mechanism 40. In the present embodiment, since L1 is configured to be M1, only the rotor 6 advances L1 relative to the shaft tube 4, and the relative position of the slide member 22 relative to the shaft tube 4 does not change. Further, since the position of the slide member 22 is not changed, the position of the cylindrical body 18 urged forward by the pressing coil spring 23 is also not changed, and the relative position of the ballpoint pen refill 8 fixed to the cylindrical body 18 via the elastic member 20 with respect to the shaft tube 4 is also not changed. Therefore, the clearance between the outer step portion 18c of the cylindrical body 18 and the front end 6g of the rolling body 6 is shortened by the amount L1 by which the rolling body advances, and therefore, the length by which the ballpoint pen refill 8 can be retracted when a pressure is applied is also reduced by L1. Then, since the amount of deformation of the elastic member 20 when the writing pressure is applied is also reduced, the pressure applied to the pressurizing space 21 is reduced, and as a result, the pressure applied to the rear end of the ink 11 in the ballpoint pen refill 8 can be reduced by rotating the rolling body 6 one step leftward.

Further, by further rotating the turning body 6 in the left direction (counterclockwise) as viewed from the rear end side from the state of fig. 10B and moving the first cam protrusion 6d along the first cam slope 5f of the slide member 5 to the state of fig. 10C, the first cam protrusion 6d of the turning body 6 is moved from the 2 nd step portion 5g2 to the adjacent 3 rd step portion 5g3 as shown in fig. 11B to 11C by the first cam mechanism 30, and the second cam protrusion 6f of the turning body 6 is moved from the 2 nd step portion 22B2 to the adjacent 3 rd step portion 22B3 as shown in fig. 12B to 12C by the second cam mechanism 40. At this time, since the moving amount L2 of the first cam protrusion and the moving amount M2 of the second cam protrusion are made equal, the slide member 22 does not move, and only the rotating body 6 further advances M2 with respect to the cylindrical body 18, and the tip 6i of the rotating body 6 comes into contact with the outer step portion 18c of the cylindrical body 18.

In this state, the cylindrical body 18 cannot be retracted by the rolling body 6, and therefore the ballpoint pen refill 8 cannot be retracted, the ink 11 is not pressurized even when a pressure is applied during writing, and the ballpoint pen refill 8 can be used as a non-pressurized writing instrument, and the ink 11 is not pressurized even when stored in this state, and therefore, the state of fig. 10C prevents the ink 11 from flowing out from the ballpoint pen tip end during storage.

Although not described in detail, in the present embodiment, as in the case of the pushing, the setting of the pressure applied to the ink 11 during writing can be changed by rotating the rotating body 6 even in the case of the non-pushing.

As described above, in the pressure writing instrument 1 of the present embodiment, the pressurizing force adjusting mechanism 24 is operated by rotating the rotary member 6, the pressurizing force is adjusted in the ink cartridge 10 in accordance with the user's preference, and the ballpoint pen refill 8 does not move forward and backward with respect to the barrel even if the setting of the pressurizing force applied to the ink 11 is changed by rotating the rotary member 6, so that the length of the tip end portion of the ballpoint pen refill 8 protruding from the tip opening portion 3a of the front shaft 3 does not change, and the use can be performed without changing the position when holding the writing instrument.

The pressure writing instrument 1 of the present embodiment includes: a shaft tube 4 capable of accommodating therein a refill 8 filled with an ink composition (ink) 11 for a writing instrument; a pressurizing mechanism 7 that applies pressure to the writing instrument ink composition (ink) 11 as the pen core 8 retreats; and a pressurizing force adjusting mechanism 24 that adjusts the pressure.

According to this type of pressure writing instrument 1, in the pressure writing instrument 1 capable of applying pressure to the writing instrument ink composition (ink) 11 in the writing instrument refill 8 in accordance with the retraction of the writing instrument refill 8 by the pen pressure at the time of writing, the pressure applied to the writing instrument ink composition (ink) 11 can be adjusted by the pressure adjustment mechanism 24, and the outflow amount of the writing instrument ink composition (ink) 11 flowing out from the writing instrument refill 8 at the time of writing can be changed. Thereby, the thickness and/or density of the handwriting can be adjusted according to the preference of the user.

The pressing-type writing instrument 1 of the present embodiment further includes a rolling member 6, the rolling member 6 is provided so as to protrude from the rear end of the barrel 4, and the pressing force adjustment mechanism 24 adjusts the pressing force by rolling the rolling member 6.

According to the pressing type writing instrument 1, the user can easily adjust the pressing force applied to the writing instrument ink composition (ink) 11 by rotating the rotor 6.

The pressure writing instrument 1 of the present embodiment is configured to accommodate a ballpoint pen refill 8 in a barrel 4, the ballpoint pen refill 8 has an ink container 10 filled with an ink composition (ink) 11 for a writing instrument, and a ballpoint pen tip 13 at a front portion of the ink container 10, and a pressure mechanism 7 is disposed at a rear portion of the ballpoint pen refill 8, and the pressure mechanism 7 applies a pressure to a rear end of the ink composition (ink) 11 for a writing instrument by retracting the ballpoint pen refill 8 by applying a pen pressure, wherein a rolling member 6 and a pressing force adjusting mechanism 24 are provided at a rear portion of the pressure mechanism 7, the rolling member 6 protrudes from the rear end of the barrel 4, the pressing force adjusting mechanism 24 operates by rotating the rolling member 6 to adjust a retraction amount of the ballpoint pen refill 8, and the pressure mechanism 7 is locked to the barrel 4 in a manner that the ball point pen refill can move back and forth and can not rotate, the rolling member 6 is rotatably locked to the shaft tube 4, and by rotating the rolling member 6, the pressurizing force adjusting mechanism 24 is operated to adjust the pressure applied to the rear end of the writing instrument ink composition (ink) 11 in the ink containing tube 10, and the relative position of the ballpoint pen refill 8 with respect to the shaft tube 4 in the axial direction does not change before and after the rolling member 6 is rotated.

According to the pressure-type writing instrument 1, the pressing force adjusting mechanism 24 for changing the retreating amount of the ballpoint pen refill 8 is operated by rotating the rolling member 6, and the pressure applied to the rear end of the writing instrument ink composition (ink) 11 at the time of writing is adjusted, whereby the outflow amount of the writing instrument ink composition (ink) 11 flowing out from the tip end of the ballpoint pen tip 13 of the ballpoint pen refill 8 is changed, and the thickness of the handwriting and the density of the handwriting can be adjusted according to the user's preference.

Since the pressurized writing instrument 1 of the present embodiment is a so-called pen-pressure pressurized type, pressure is applied to the rear end of the writing instrument ink composition (ink) 11 only when pen pressure is applied. Therefore, the rear end of the writing instrument ink composition (ink) 11 is not pressurized during non-writing and storage, and ink can be prevented from leaking from the front end of the ballpoint pen tip 13.

Further, when the rolling member 6 is rotated, the relative positions of the ballpoint pen refill 8 and the barrel 4 in the axial direction do not change, and therefore, the length of the tip portion of the ballpoint pen refill 8 protruding from the tip opening portion 3a of the barrel 4 does not change. Therefore, even if the pressurizing force is adjusted, it is not necessary to change the position of the grip shaft tube 4, and writing can be continued while keeping the feeling of distance from the paper surface and the grip position constant.

In the pressure writing instrument 1 of the present embodiment, a slide member 5 is disposed inside a shaft tube 4, the slide member 5 is locked to the shaft tube 4 so as to be movable forward and backward and unrotatable, the slide member 5 includes a pressure mechanism 7 disposed inside the slide member 5, and a rolling body 6 disposed so that a part thereof protrudes backward from a rear end opening of the slide member 5, and a tip end portion of a ballpoint pen refill 8 protrudes from a front end opening 3a of the shaft tube 4 by pressing the rolling body 6 forward.

According to the pressure writing instrument 1, the pressure writing instrument 1 can be a so-called push-type pressure writing instrument in which the tip of the ballpoint pen refill 8 protrudes from the tip opening 3a of the barrel 4.

In the pressurized writing instrument 1 of the present embodiment, the pressurizing force adjusting mechanism 24 includes: a sliding member 5; a rotating body 6 inserted from the front end opening 3a of the slide member 5 and locked to the slide member 5 to be rotatable and movable forward and backward; and a sliding member 22 that is disposed inside the rotating body 6 and is locked to the rotating body 6 so as to be rotatable and movable forward and backward, a first cam mechanism 30 that moves the rotating body 6 forward and backward with respect to the sliding member 5 being provided between the sliding member 5 and the rotating body 6, and a second cam mechanism 40 that moves the sliding member 22 forward and backward with respect to the rotating body 6 being provided between the rotating body 6 and the sliding member 22.

According to the pressure writing instrument 1, the ball-point pen refill 8 can be retracted by the pressing (pushing) operation of the rolling member 6, and the pressure can be adjusted by moving the slide member 22 forward and backward by the rotation of the rolling member 6. Therefore, the present embodiment can easily switch between the writing state and the non-writing state without adjusting the pressurizing force every time.

Further, as means for maintaining the state in which the tip end portion of the ballpoint pen refill 8 is projected from the tip opening portion 3a of the shaft tube 4 when the rolling body 6 is pressed, a projecting hooking portion 5a is provided in the slide member 5 that is interlocked with the forward and backward movement of the rolling body 6, and a clip 9 is formed on the outer peripheral portion of the shaft tube 4, and the above-mentioned hooking portion 5a and a hooked portion 9c formed in the clip 9 can be hooked to each other and can also be retained by hooking the hooking portion to a hooked portion formed on the side surface of the shaft tube 4.

Further, by providing the first cam mechanism 30 for moving the rotating body 6 forward and backward with respect to the sliding member 5 between the sliding member 5 and the rotating body 6, a second cam mechanism 40 for moving the slide member 22 forward and backward with respect to the rotor 6 is provided between the rotor 6 and the slide member 22, and the operation of moving the rotor 6 forward and backward with respect to the slide member 5 and the operation of moving the slide member 22 forward and backward with respect to the rotor 6 when the rotor 6 is rotated can be divided, further, the operation of moving the rotating body 6 forward and backward with respect to the sliding member 5 and the operation of moving the sliding member 22 forward and backward with respect to the rotating body 6 act in the same amount in the opposite forward and backward directions, whereby the rotating body 6 can be rotated, even if the rotating body 6 moves forward and backward with respect to the sliding member 5, the sliding member 22 does not move relative to the sliding member 5 in the forward and backward direction.

In the pressure writing instrument 1 of the present embodiment, the first cam mechanism 30 has a first cam slope 5f inclined with respect to the axial direction and extending in the axial circumferential direction on the inner surface of the slide member 5, and has a first cam protrusion 6d formed to be in sliding contact with the first cam slope 5f on the outer surface of the rotating body 6, the second cam mechanism 40 has a second cam slope 22a inclined with respect to the axial direction and extending in the axial circumferential direction on the outer surface of the slide member 22, and has a second cam protrusion 6f formed to be in sliding contact with the second cam slope 22a on the inner surface of the rotating body 6.

According to this pressure writing instrument 1, the first cam mechanism 30 forms the first cam slope 5f on the inner surface of the slider 5, forms the first cam protrusion 6d on the outer surface of the rotating body 6, and the first cam protrusion 6d comes into sliding contact with the first cam slope 5f, whereby the rotating body 6 moves forward and backward with respect to the slider 5. Further, the second cam mechanism 40 has a second cam protrusion 6f formed on the inner surface of the rotating body 6, a second cam slope 22a formed on the outer surface of the sliding member 22, and the sliding member 22 moves forward and backward with respect to the rotating body 6 by the sliding of the second cam protrusion 6f and the second cam slope 22 a. The first cam mechanism 30 may be configured such that a cam protrusion is provided on the inner surface of the slide member 5 and the cam protrusion is in sliding contact with a cam slope formed on the outer surface of the rotating body 6. The second cam mechanism 40 may be configured such that a cam slope is provided on the inner surface of the rotating body 6, and the cam slope slides on a cam protrusion formed on the outer surface of the slide member 22.

Further, it is preferable that the first cam projection 6d is formed on the outer surface of the rotating body 6, the first cam slope 5f which is in sliding contact with the first cam projection 6d is formed on the inner surface of the slide member 5, the second cam projection 6f is formed on the inner surface of the rotating body 6, and the second cam slope 22a which is in sliding contact with the second cam projection 6f is formed on the outer surface of the slide member 22, and in this case, by forming the cam projections 6d and 6f on the outer surface and the inner surface of the rotating body 6, the sliding contact position of the rotating body 6 with the slide member 5 and the slide member 22 can be easily controlled, and the following effects are exhibited: the length of the slide member 5 moving forward and backward with respect to the rotating body 6 can be easily matched with the length of the slide member 22 moving forward and backward.

Further, it is preferable that a plurality of step portions 5g and 22b are provided on the first cam slope 5f and the second cam slope 22a formed on the inner surface of the slide member 5 and the outer surface of the slide member 22, respectively, so that adjustment of the pressurizing force when the rotating body 6 is rotated can be switched in stages, thereby exhibiting an effect that the pressurizing force can be easily adjusted by the user.

In the pressurized writing instrument 1 of the present embodiment, the pressurizing mechanism 7 includes: a cylindrical body 18 having a through hole 18a penetrating in the front-rear direction; an elastic member 20 disposed inside the cylindrical body 18, the rear end portion of the ballpoint pen refill 8 being detachably attached to the elastic member 20; a pressurizing chamber (pressurizing space) 21 formed between the inner wall of the elastic member 20 and the rear end of the ink cartridge 10 and communicating with the inside of the rear end opening of the ink cartridge 10; a fixing member 19 disposed inside the tubular body 18 and behind the elastic member 20; and an air hole 20c that communicates the pressurizing chamber (pressurizing space) 21 with the outside, the cylindrical body 18 is locked to the slide member 5 so as to be movable forward and backward and unrotatable, the slide member 22 is locked to the cylindrical body 18 so as to be movable forward and backward and unrotatable, and an urging member (a spiral spring for pressurizing) 23 is disposed between a rear inner step of the cylindrical body 18 and a front inner step of the slide member 22, whereby the cylindrical body 18 is urged forward with respect to the slide member 22, and the cylindrical body 18 is retracted together with the ballpoint pen refill 8, whereby the elastic member 20 abuts against the anchor 19 to deform the elastic member 20, the pressurizing chamber (pressurizing space) 21 is compressed, and a pressure is applied to the rear end of the ink composition 11 in the ink containing tube 10.

According to the pressing type writing instrument 1, the pressing mechanism 7 is configured such that the cylindrical body 18 retreats together with the ballpoint pen refill 8, whereby the elastic member 20 abuts against the anchor 19 and deforms, and the pressing chamber (pressing space) 21 in the elastic member 20 is compressed by the amount of deformation of the elastic member 20, thereby applying a pressure to the rear end of the writing instrument ink composition (ink) 11. In this case, when the compressed compression chamber (compression space) 21 is opened, the original non-compressed state can be returned by the elastic force of the elastic member 20, and therefore, an elastic body such as a spring can be disposed without adding an additional elastic body, and even when the spring is disposed, the elastic force of the spring can be reduced, and thus, the degree of freedom in design can be improved.

The material used for the elastic member 20 is not particularly limited as long as it is a resin material having rubber elasticity, but for example, nitrile rubber, ethylene propylene diene rubber, silicone rubber, thermoplastic elastomer, or the like can be preferably used.

Further, a display portion may be provided on the outer surface of the rotating body 6, and when the step portions 5g and 22b and the cam projections 6d and 6f of the rotating body 6 come into contact with each other, a portion where the display portion of the rotating body 6 and the display portion provided on the outer surface of the shaft tube 4 coincide may indicate the intensity of the pressing force at that time.

Further, as a method of indicating the strength of the pressing force, a number (0, 1, 2, 3. cndot. cndot.), a character (strong, medium, weak, none), a symbol, or the like can be used, and there is no particular limitation.

In addition, various modifications can be made to embodiment 1. Next, modified examples will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for corresponding portions in embodiment 1 are used for portions that can be configured in the same manner as in embodiment 1, and redundant description is omitted. Note that, in the case where the operational effects obtained in embodiment 1 are also obtained in the modification, the description thereof may be omitted.

Fig. 13 shows a pressurized writing instrument 100 according to this modification, and a display portion 200b formed of lines and numerals is formed on an outer surface 200a of a rear shaft 200 of the pressurized writing instrument 100. Further, a display portion 600b is formed on an outer surface 600a of the rotating body 600, and the display portion 600b is formed in a concave shape and in a triangular shape when viewed from the side.

In the present modification, when the rotary body 600 is rotated while pushing the rotary body 600 forward, the top portion 600c at the front end of the display portion 600b is aligned with the linear portion 200c of the display portion 200b of the rear shaft 200, and the digital portion 200d located in front of the linear portion 200c is read, whereby the pressure applied to the rear end of the ink at this time can be visually confirmed.

In the present modification, the adjustment is performed such that the pressurizing force is the maximum when the distal end top portion 600C of the display portion 600B is aligned with "2" of the digital portion 200d (fig. 10A), the low pressurizing force is applied when the distal end top portion is aligned with "1" (fig. 10B), and the pressurizing force is not applied when the distal end top portion is aligned with "0" (fig. 10C).

[ 2 nd embodiment ]

Next, embodiment 2 will be described with reference to fig. 14 to 29C.

As shown in fig. 14 to 19, a pressure writing instrument 101 of the present embodiment is configured such that a front shaft 103 is screwed into a front portion of a rear shaft 102 to form a shaft tube 104, and includes: a slide member 105 disposed in the shaft tube 104 so as to be movable forward and backward; a rotating body 106 rotatably locked to the sliding member 105; a pressurizing mechanism 130 disposed in the slide member 105; a ballpoint pen refill 108 attached to the pressurizing mechanism 130 and capable of sliding back and forth in the barrel 104; and a clip 109 rotatably engaged with a side surface of the rear axle 102.

The ink for writing instrument (shear rate 1.92sec in an environment of 20 ℃ C.) was directly contained in a transparent ink containing tube 110 made of PP resin for a ballpoint pen refill 108^-1Aqueous gel ink having an ink viscosity of 755mPa · s (rotation speed 0.5rpm), namely, ink 111 and grease-like ink follower 112 that follows the rear end of the ink 111 as the ink 111 is consumed, the bead is press-fitted into the front end opening of the ink cartridge 110 so as to be freely rotatable

The rear end portion of the ballpoint pen tip 113.

As shown in fig. 15, the front shaft 103 has a front end opening 103a at the front end through which a ballpoint pen tip 113 of the ballpoint pen refill 108 can protrude.

The rear shaft 102 is formed in a tubular shape, and as shown in fig. 16, a side hole 102b extending in the axial direction and penetrating into the inner hole is formed in the outer surface 102 a. Further, a clip locking portion 102c protruding outward is formed on the outer side surface 102a, and the clip locking portion 102c is composed of a clip locking projection 102d and a spring locking projection 102 e. Further, the clip locking projection 102d has a locking hole 102f formed in a direction perpendicular to the axial direction.

Further, a locking rail portion 102g protruding inward and extending forward and backward is formed on the rear inner circumferential surface of the rear shaft 102, and an inner locking portion 102i extending in the circumferential direction and formed in a concave shape is formed on the front inner circumferential surface.

Further, as shown in fig. 14, a pressurizing force display portion 102h formed of a linear portion and a numeral is formed on the outer peripheral surface of the rear portion of the rear shaft 102. The pressing force display portion 102h may be formed by decorating the outer peripheral surface of the rear axle 102 by printing, transfer, painting, or the like, or may be integrally formed as a concave portion or a convex portion by injection molding or the like.

Further, an annular middle block 107 is disposed inside the rear shaft 102, and the middle block 107 is mounted on the rear shaft 102 in a non-detachable manner by fitting an outer locking portion 107a formed on the outer peripheral portion of the middle block 107 into an inner locking portion 102i of the rear shaft 102. Further, an inner step portion 107b is formed on the rear inner peripheral portion of the middle block 107.

As shown in fig. 15 to 18, the slide member 105 has a hooking portion 105a protruding outward at an outer peripheral portion, the hooking portion 105a is inserted into the side hole 102b of the rear shaft 102, a locking groove 105b extending in the axial direction is formed on an outer surface of a rear portion of the slide member 105, and the slide member 105 is slidably and non-rotatably locked to the rear shaft 102 by fitting the locking groove 105b to the locking rail portion 102g of the rear shaft 102.

As shown in fig. 17, a slit 105c extending rearward from the front end is formed in the side surface of the slider 105, and the slit 105c is formed symmetrically at 2 locations with respect to the axis. Further, a slit locking portion 105d, which is partially formed to narrow the slit width, is formed at the rear portion of the slit portion.

Further, a first cam slope 105e formed obliquely in the axial circumferential direction and protruding inward is formed on the inner surface of the slider 105, and a plurality of step portions 105f (1 st step portion 105f1, 2 nd step portion 105f2, 3 rd step portion 105f3) are formed on the first cam slope 105 e. Further, the plurality of step portions 105f are respectively formed with recessed portions 105g formed in a recessed shape toward the rear.

A cylindrical spacer 114 is disposed in front of the slide member 105, and a rear step portion 114a is formed in a rear portion of the spacer 114. Further, the back step portion 114a is inserted into the inner peripheral portion 105h of the slide member 105, thereby fitting the spacer ring 114 to the slide member 105.

Further, as shown in fig. 16, the sliding member 105 is pushed rearward with respect to the rear shaft 102 (the shaft tube 104) via the spacer ring 114 by the urging coil spring 115 being stretched in a compressed state between the inner step portion 107b of the middle block 107 and the inner step portion 114b of the spacer ring 114, which are attached to the inner surface of the rear shaft 102 (the shaft tube 104).

As shown in fig. 14 to 16, the clip 109 is provided with a coil spring 116 for clip between the spring locking projection 102e of the rear shaft 102 and the inner wall portion 109a of the clip 109, and the distal end portion of the clip 109 is stretched so as to be constantly pushed toward the outer wall surface of the rear shaft 102 by locking the locking shaft portion 109b formed on the inner wall of the clip 109 in the locking hole 102 f. Further, the movable clip is configured as follows: by pressing the rear end portion of the clip 109 (in the direction of arrow G in fig. 15), the distal end portion of the clip 109 can be separated from the outer wall surface of the rear axle 102 with the locking shaft R of the clip 109 and the rear axle 102 as a fulcrum.

Further, a hooked portion 109c is formed at the front portion of the clip 109, and the hooked portion 109c extends from the base portion 109d toward the shaft tube 104 side and hooks with a hooking portion 105a formed on the side surface of the slider 105.

As shown in fig. 15 to 17, the pressurizing mechanism 130 is housed in the rear of the ballpoint pen refill 108 and inside the slide member 105 so as to be movable forward and backward with respect to the slide member 105, and the pressurizing mechanism 130 is configured by: a cylinder 117 formed in a cylindrical shape; a piston 118 disposed at the rear of the cylinder 117 and movably attached to the cylinder 117 in the front-rear direction; an airtight valve 119 attached to the front inner peripheral portion of the cylinder 117 so as to be movable forward and backward, and attached to the rear end portion of the ballpoint pen refill 108 so as to be detachable; a pressurizing coil spring (urging member) 120 that is arranged between the airtight valve 119 and the piston 118; and a pressurizing space (pressurizing chamber) 121 surrounded by the cylinder 117, the piston 118, and the air-tight valve 119 and communicating with the rear inner hole 108a of the ballpoint pen core 108.

Describing the cylinder 117 in detail, as shown in fig. 15 to 17, the cylinder 117 includes a through hole 117a penetrating in the front-rear direction and having a plurality of step portions. Further, a locking projection 117b projecting outward and a side hole 117c penetrating the through hole 117a and extending in the axial circumferential direction are formed in the outer peripheral portion of the cylinder 117.

Further, as shown in fig. 19, a flat portion 117e is formed in a rear inner hole 117d of the cylinder 117.

As shown in fig. 17 and 19, the locking projection 117b of the cylinder 117 is loosely fitted into the slit locking portion 105d of the slit portion 105c formed in the side surface of the slide member 105 so as to be movable forward and backward by the amount of clearance in the axial direction between the slit locking portion 105d and the locking projection 117b, whereby the cylinder 117 is locked together with the slide member 105 to the rear shaft 102 (the shaft tube 104) so as to be movable forward and backward and so as not to be rotatable.

To describe the piston 118 in detail, as shown in fig. 15 to 19, a front end recess 118a recessed rearward is formed at the front end. A groove portion 118b extending in the axial circumferential direction is formed in the side surface, and a first O-ring 122 made of silicone rubber having a durometer a hardness of 50 measured in JIS-K6235 is attached to the groove portion 118b as an airtight member. An outer end of the first O-ring 122 (airtight member) abuts against an inner circumferential surface of the cylinder 117, and the first O-ring 122 (airtight member) seals a space between the cylinder 117 and the piston 118 to seal the pressurizing space 121, and generates a certain sliding resistance to the forward and backward sliding of the piston 118 with respect to the cylinder 117.

Further, piston 118 is formed such that the diameter of the front portion is larger than the diameter of the rear portion, and outer surface step portion 118c formed on the outer peripheral portion abuts inner step 117h of cylinder 117, thereby restricting movement of piston 118 toward the rear. A flat portion 118g is formed on the outer peripheral portion of the rear portion of the piston 118, and the piston 118 is assembled to the cylinder 117 so as to be movable forward and backward and non-rotatable by fitting the flat portion 118g to the flat portion 117e of the cylinder 117.

Further, a second cam slope 118d is formed on a side surface of the piston 118. Further, a plurality of step portions 118e (a 1 st step portion 118e1, a 2 nd step portion 118e2, and a 3 rd step portion 118e3) are formed on the second cam slope 118d, and a recess portion 118f formed in a concave shape toward the front is formed in each of the plurality of step portions 118 e.

In detail, as shown in fig. 15 to 17, the airtight valve 119 has an inner hole 119a formed therein, which extends in the axial direction and connects the rear inner hole 108a of the ballpoint pen refill 108 and the pressurizing space 121. The front portion 119b of the airtight valve 119 is formed to have a smaller diameter than the rear outer peripheral portion of the airtight valve 119, a fitting portion 119c is formed at the front portion 119b, and the rear inner hole 108a of the ballpoint pen refill 108 is detachably fitted to the fitting portion 119 c. Therefore, the pressurizing space 121 (pressurizing chamber) is communicated to the rear inner hole 108a of the ballpoint pen core 108 via the inner hole 119a of the airtight valve 119.

Further, an outer protrusion 119d is formed on the middle outer peripheral portion of the airtight valve 119, and a flange portion 119g protruding outward is formed in front of the outer protrusion 119 d. Further, the outer protrusion 119d of the airtight valve 119 is inserted into the side hole 117c attached to the cylinder 117, whereby the airtight valve 119 is attached to the cylinder 117 so as to be movable forward and backward and not to be attachable and detachable.

Further, the front end of the outer protrusion 119d is brought into contact with the front end of the side hole 117c, or the rear end of the flange portion 119g is brought into contact with the front end of the cylinder 117, whereby the forward and backward movement of the cylinder 117 with respect to the airtight valve 119 is regulated.

Further, a groove portion 119e extending in the axial circumferential direction is formed in the outer peripheral surface of the rear portion of the airtight valve 119, and a second O-ring 123 made of silicone rubber having a durometer a hardness of 50 measured in JIS-K6235 is attached to the groove portion 119e as an airtight deformation portion.

The second O-ring 123 (the air-tightness deforming portion) is configured to be capable of abutting against the abutting portion 117g of the cylinder 117 (the rear end of the side hole 117 c), the pressurizing space 121 is sealed to be airtight when the abutting portion 117g of the cylinder 117 (the rear end of the side hole 117 c) and the second O-ring 123 (the air-tightness deforming portion) are in an abutting state, and when the abutting portion 117g of the cylinder 117 (the rear end of the side hole 117 c) and the second O-ring 123 (the air-tightness deforming portion) are in a non-abutting state, an air passage 124 through which the pressurizing space 121 and the outside of the pressure-applying writing instrument 101 communicate is formed by a gap between the second O-ring 123 (the air-tightness deforming portion) and the rear end of the side hole 117c of the cylinder 117, and the pressurizing space 121 is in a state in which the air pressure is the same as the outside air.

Further, a rear inner step portion 119f is formed in the inner hole 119a of the air-tight valve 119, and a pressurizing coil spring 120 is bridged between the rear inner step portion 119f and the front end recess portion 118a of the piston 118, whereby the air-tight valve 119 is urged forward relative to the piston 118.

Further, since the flange portion 119g of the air-tight valve 119 is configured to abut against the rear end of the spacer ring 114, the piston 118 is also urged rearward by the pressurization coil spring 120 via the air-tight valve 119.

Next, describing the turning body 106 in detail, as shown in fig. 15 to 16, the turning body 106 is inserted into the slide member 105 from the front end opening of the slide member 105, and is assembled so that a part thereof protrudes rearward from the rear opening of the slide member 105.

As shown in fig. 17, the rotor 106 is formed with a first cam projection 106b extending rearward from the front outer peripheral surface 116a and a second cam projection 106d extending forward from the rear inner peripheral surface 106 c.

The first cam mechanism 140 is configured by cam-fitting the first cam projection 106b of the rotating body 106 and the first cam inclined surface 105e of the sliding member 105, and the second cam mechanism 150 is configured by cam-fitting the second cam projection 106d of the rotating body 106 and the second cam inclined surface 118d of the piston 118.

As shown in fig. 14, a position alignment mark 106f is formed on the outer peripheral surface of the rear portion of the rotating body 106, and the position alignment mark 106f is formed in a concave shape and in a triangular shape when viewed from the side.

In the present embodiment, when the rotating body 106 is rotated while pushing the rotating body 106 forward, the front end top portion 106g of the position alignment mark 106f is aligned with the linear portion of the pressurizing force display portion 102h of the rear shaft 102, and the number located in the front portion of the linear portion is read, whereby the pressurizing force applied to the rear end of the ink at this time can be visually confirmed.

In the present embodiment, the adjustment is performed such that the state in which the pressure in the pressure space (pressure chamber) 121 is the maximum pressure is set when the position alignment mark 106f is aligned with "3" of the pressure force display unit 102h (fig. 27A), the state in which low pressure is applied is set when the position alignment mark is aligned with "2" (fig. 27B), and the state in which no pressure is applied is set when the position alignment mark is aligned with "1" (fig. 27C).

Furthermore, the end plugs 125 made of a thermoplastic elastomer are press-fitted into the rear end openings of the rolling element 106, and a plurality of projecting portions extending in the axial direction are arranged uniformly in the axial circumferential direction on the side surfaces of the end plugs 125, whereby the rolling element 106 is less likely to slip when rotated for each end plug 125.

Further, the slide member 105, the rolling element 106, the tail plug 125, and the piston 118 constitute a pressing force adjusting mechanism 160, and the pressing force adjusting mechanism 160 can change the pressure to be pressurized in the pressurizing space 121 by rotating the rolling element 106.

Next, a description will be given of a state in which the writing tip of the ballpoint pen refill 108, i.e., the ballpoint pen tip 113, is drawn out and retracted from the front end opening 103a of the front shaft 103 by pressing (pushing) the rolling body 106 forward.

When the tail plug 125 and the rotating body 106 are pressed forward (in the direction of arrow F in fig. 15) against the elastic force of the pushing coil spring 115 from the state of fig. 15, the second cam protrusion 106d of the rotating body 106 and the second cam slope 118d of the piston 118 are cam-fitted, and thereby the piston 118 is pushed forward by the rotating body 106 together with the rotating body 106. Then, when the front end 106e of the rolling element 106 abuts against the rear end 117f of the cylinder 117, the cylinder 117 advances, and further, when the front end of the cylinder 117 abuts against the flange portion 119g of the airtight valve 119, the airtight valve 119 and the ballpoint pen refill 108 attached to the attachment portion 119c of the airtight valve 119 advance together with the cylinder 117, and the front end portion of the ballpoint pen tip 113 of the ballpoint pen refill 108 protrudes from the front end opening portion 103a of the front shaft 103.

At this time, the locking projection 117b of the cylinder 117 is loosely fitted to the slit locking portion 105d of the slide member 105 so as to be movable forward and backward, and therefore, the locking projection 117b of the advancing cylinder 117 comes into contact with the tip of the slit locking portion 105d, and the slide member 105 starts advancing, and the hooking portion 105a of the slide member 105 hooks the hooked portion 109c of the tip portion of the clip 109 disposed on the side surface of the rear shaft 102, whereby the state of fig. 20 in which the tip of the ballpoint pen tip 113 of the ballpoint pen refill 108 is kept protruding from the tip opening portion 103a of the front shaft 103 (shaft barrel 104) is maintained.

Here, when the rear end portion (arrow G direction in fig. 20) of the clip 109 is pressed to release the hooking state of the hooking portion 105a of the slide member 105 hooked on the hooked portion 109c of the clip 109, the ballpoint pen refill 108, the pressing mechanism 130, the spacer 114, the slide member 105, and the rolling element 106 move rearward by the elastic force of the urging coil spring 115 to return to the state in fig. 15.

Next, in the present embodiment, a description will be given of a state in which a pressure is applied to the rear end of the ink 111 in the ballpoint pen refill 108 via the ink follower 112 by the writing pressure at the time of writing.

In a state where the tip end of the ballpoint pen tip 113 in fig. 20 and 23 protrudes from the tip opening portion 103a of the front shaft 103, the shaft tube 104 is held at an inclination as shown in fig. 21, a writing pressure is applied to the tip end of the ballpoint pen tip 113, and when the ballpoint pen refill 108 retreats in the arrow H direction of fig. 21, the hooking portion 105a hooks with the hooked portion 109c of the clip 109, and therefore, the slider member 105 cannot retreat, and the rotor 106 cam-engages with the slider member 105, and therefore cannot retreat, and further, the piston 118 cam-engages with the rotor 106, and therefore cannot retreat, and the airtight valve 119 retreats together with the ballpoint pen refill 108 against the elastic force of the pressing coil spring 120. Then, when the second O-ring 123 fixed to the airtight valve 119 abuts against the abutting portion 117g of the cylinder 117 (the rear end of the side hole 117 c), the pressurizing space (pressurizing chamber) 121 and the air passage 124 communicating with the outside are closed, and the inside of the pressurizing space 121 is airtight as shown in fig. 24. Further, when the ballpoint pen refill 108 retreats, the cylinder 117 retreats together with the airtight valve 119 relative to the piston 118, and the volume of the pressurizing space 121 decreases, whereby the inside of the pressurizing space 121 is compressed, and the rear end of the ink 111 in the ballpoint pen refill 108 is pressurized through the inner hole 119a of the airtight valve 119 via the ink follower 112, which is the state of fig. 22 and 25.

When the pressure applied to the tip of the ballpoint pen tip 113 is released from the state shown in fig. 22 and 25, the airtight valve 119 moves forward by the elastic force of the pressing coil spring 120. At this time, the second O-ring 123 is pressed against the contact portion 117g of the cylinder 117 (the rear end of the side hole 117 c) by the pen pressure and deformed, whereby the second O-ring 123 and the cylinder 117 are in a lightly fitted state. Therefore, as the airtight valve 119 moves forward, the cylinder 117 is pulled forward, and the cylinder 117 also moves forward at the same time. However, since the fitting force applied between piston 118 and cylinder 117 by first O-ring 122 is set to be larger than the fitting force applied between airtight valve 119 and cylinder 117 by second O-ring 123, cylinder 117 does not move relative to piston 118, and only airtight valve 119 advances first, which is the state of fig. 26. Thus, when the contact portion 117g (the rear end of the side hole 117 c) of the cylinder 117 and the second O-ring 123 are separated, the air passage 124 is formed, the pressurizing space 121 communicates with the outside, and the pressure becomes equal to the atmospheric pressure. Then, the distal end of the outer projection 119d of the advancing airtight valve 119 comes into contact with the distal end of the side hole 117c of the cylinder 117, and the cylinder 117 also starts advancing with a delay, and returns to the state of fig. 20 and 23. As a result, when writing is performed by the pressure writing instrument 101 in which the pen pressure is applied, the ink 111 in the ink cartridge 110 is consumed, and even if the pressure space 121 is depressurized accordingly, the air-tight valve 119 moves forward before the cylinder 117 moves forward when the pen pressure is released, thereby forming the air passage 124, and the pressure space 121 becomes the same air pressure as the atmosphere, so that the pressure space 121 is not forcibly depressurized as in the case of compression by the pen pressure, and a negative pressure state lower than the atmosphere can be prevented.

In the state shown in fig. 22 and 25 in which the writing pressure is applied to the tip end of the ballpoint pen tip 113 of the present embodiment, for example, the fitting force (pressing force required to move the cylinder 117 with respect to the airtight valve 119) generated between the airtight valve 119 and the cylinder 117 by the second O-ring 123 is 0.1N, and the fitting force (pressing force required to move the cylinder 117 with respect to the piston 118) generated between the piston 118 and the cylinder 117 by the first O-ring 122 is 0.5N, so that when the writing pressure is released, the cylinder 117 does not move with respect to the piston 118, and only the airtight valve 119 moves forward first.

Next, the following operation will be explained: in the pushing state of fig. 20, the pressing force adjustment mechanism 160 is operated by rotating the rotor 106 with respect to the rear shaft 102, thereby adjusting the pressing force applied to the ink 111.

When the rolling member 106 is rotated in the left direction (counterclockwise) as viewed from the rear end side from the state of fig. 20 and 27A until the front end top portion 106g (see fig. 14) of the position alignment mark 106f of the rolling member 106 coincides with the positions "3" to "2" of the pressurizing force display portion 102h of the rear shaft 102 to reach the state of fig. 27B, the slide member 105 is locked to the rear shaft 102 so as to be unrotatable, and therefore, as shown in fig. 28A to 28B, the first cam protrusion 106B of the rolling member 106 moves from the 1 st step portion 105f1 to the adjacent 2 nd step portion 105f2 along the first cam slope 105e of the slide member 105. At this time, the rotating body 106 moves forward by an amount L1 of one step with respect to the slider 105 by which the first cam protrusion 106b moves forward (see fig. 28A).

Then, since the piston 118 is unrotatably locked to the rear shaft 102 (the shaft tube 104) via the cylinder 117 and the sliding member 105, the second cam protrusion 106d of the rotating body 106 moves from the 1 st step portion 118e1 to the adjacent 2 nd step portion 118e2 along the second cam slope 118d of the piston 118 as shown in fig. 29A to 29B along with the rotation of the rotating body 106. At this time, the piston 118 moves backward by the amount M1 of one step relative to the second cam projection 106d of the rotating body 106 (see fig. 29A). Accordingly, the piston 118 is advanced L1 by the first cam mechanism 140 and retracted M1 by the second cam mechanism 150. In the present embodiment, since L1 is configured to be M1, only the rotor 106 moves forward L1 with respect to the shaft tube 104, and the relative position of the piston 118 with respect to the shaft tube 104 does not change. Further, since the position of the piston 118 is not changed, the position of the airtight valve 119 urged forward by the pressing coil spring 120 is not changed, and the relative position of the ballpoint pen refill 108 attached to the attachment portion 119c of the airtight valve 119 with respect to the shaft 104 is not changed. Therefore, the clearance between the rear end 117f of the cylinder 117 and the front end 106e of the rolling element 106 is shortened by the amount L1 by which the rolling element 106 advances, and therefore, the length by which the ballpoint pen core 108 can retreat when a writing pressure is applied is also reduced by L1, and the amount of compression of the pressure space (pressure chamber) 121 is reduced, thereby reducing the pressure applied to the inside of the pressure space 121. As a result, the pressure applied to the rear end of the ink 111 in the ballpoint pen refill 108 can be reduced by rotating the rolling element 106 by one step in the left direction (counterclockwise) as viewed from the rear end side.

Further, by rotating the rotating body 106 leftward (counterclockwise) from the state of fig. 27B until the tip portion 106g (see fig. 14) of the position alignment mark 106f of the rotating body 106 coincides with the positions "2" to "1" of the pressing force display portion 102h of the rear shaft 102, and moving the first cam protrusion 106B along the first cam slope 105e of the slide member 105 to the state of fig. 27C, the first cam protrusion 106B of the rotating body 106 moves from the 2 nd step portion 105f2 to the adjacent 3 rd step portion 105f3 as shown in fig. 28B to 28C by the first cam mechanism 140, and the second cam protrusion 106d of the rotating body 106 moves from the 2 nd step portion 118e2 to the adjacent 3 rd step portion 118e3 by the second cam mechanism 150 as shown in fig. 29B to 29C. At this time, since the moving amount L2 of the first cam projection 106b is made equal to the moving amount M2 of the second cam projection 106d, the piston 118 does not move, and only the rolling element 106 is further advanced M2 with respect to the cylinder 117, and the tip 106e of the rolling element 106 abuts against the outer surface stepped portion 118c of the piston 118.

In this state, the rear end 117f of the cylinder 117 abuts on the front end 106e of the rolling member 106 and cannot retreat, and therefore, the length of retreat of the ballpoint pen refill 108 is also reduced, and the pressurizing space 121 cannot be sealed. Therefore, even if a pressure is applied during writing, the ink 111 is not pressurized by the pressurizing mechanism 130, and can be used as a non-pressurized writing instrument, and further, even if stored in a pushed state, the ink 111 is not pressurized by a malfunction in the ballpoint pen refill 108, and therefore, the ink 111 can be prevented from flowing out from the tip of the ballpoint pen tip 113 during storage.

Although not described in detail, in the present embodiment, as in the case of the pushing, the setting of the pressure applied to the ink 111 during writing can be changed by rotating the rotating body 106 during the non-pushing.

In the present embodiment, for example, when the atmospheric pressure is 1000hpa, the pressurized state in the pressurized space 121 when the pen pressure is applied with the position alignment mark 106f of the rotating body 106 aligned with the position of "3" of the pressurized force display portion 102h of the rear shaft 102 to operate the pressurizing mechanism 130 is 1040hpa, the pressurized state is 1020hpa with the position alignment mark 106f aligned with "2" of the pressurized force display portion 102h, and the pressurized state is not pressurized with the position alignment mark 106f aligned with the position of "1", and therefore the atmospheric pressure is 1000hpa, which is the same as the atmospheric pressure.

As described above, in the pressure writing instrument 101 of the present embodiment, by rotating the rolling member 106 and operating the pressurizing force adjusting mechanism 160, the pressurizing force is adjusted in the ink cartridge 110 in accordance with the preference of the user, the amount of ink discharged from the tip end of the ballpoint pen tip 113 is changed, the thickness of the writing and the density of the writing can be improved, and the ballpoint pen refill 108 does not move back and forth with respect to the barrel even if the setting of the pressurizing force applied to the ink 111 is changed by rotating the rolling member 106, and therefore, the length of the tip end portion of the ballpoint pen refill 108 protruding from the tip opening portion 103a of the shaft 103 does not change, and the use can be continued without changing the position for gripping the writing instrument. Further, it is possible to provide a pressure writing instrument capable of preventing the ink 111 in the ink cartridge 110 from flowing backward due to negative pressure in the pressure space 121 (pressure chamber) when the pen pressure is released.

The pressure writing instrument 101 of the present embodiment is configured to accommodate a ballpoint pen refill 108 in a barrel 104, the ballpoint pen refill 108 having an ink container 110 filled with an ink composition (ink) 111 for a writing instrument, and a ballpoint pen tip 113 at a front portion of the ink container 110, and a pressure mechanism 130 disposed at a rear portion of the ballpoint pen refill 108, and the pressure mechanism 130 applies a pressure to a rear end of the ink composition 111 for a writing instrument by retracting the ballpoint pen refill 108 by applying a pen pressure, wherein the pressure mechanism 130 includes: a cylinder 117 formed in a cylindrical shape; an airtight valve 119 having an airtight deformation portion (second O-ring) 123 on an outer peripheral surface thereof and formed to be movable forward and backward with respect to the cylinder 117; a piston 118 attached to a rear inner hole 117d of the cylinder 117 so as to be movable forward and backward; an airtight member (first O-ring) 122 disposed between the piston 118 and the cylinder 117; a pressurizing chamber (pressurizing space) 121 surrounded by the cylinder 117, the airtight valve 119, the piston 118, and an airtight member (first O-ring) 122 and communicating with the rear portion of the ballpoint pen refill 108; and an urging member (a pressing coil spring) 120 which is disposed between the airtight valve 119 and the piston 118, urges the airtight valve 119 forward, and when a writing pressure is applied to the tip of the ballpoint pen tip 113, the ballpoint pen refill 108 moves backward, and in conjunction with the backward movement of the ballpoint pen refill 108, the cylinder 117 and the airtight valve 119 move backward relative to the piston 118 against the elastic force of the urging member (the pressing coil spring) 120, and compress and pressurize the inside of the pressurizing chamber (the pressurizing space) 121 after sealing, and when the writing pressure to the ballpoint pen refill 108 is released, the airtight valve 119 moves forward relative to the piston 118 before the cylinder 117, thereby forming an air passage 124 which communicates the pressurizing chamber (the pressurizing space) 121 and the outside, and the airtight state of the pressurizing chamber (the pressurizing space) 121 is released to become the same air pressure as the atmospheric pressure, and then the cylinder 117 moves forward with a delay.

In the pressure writing instrument 101 of the pressure type such as the airtight member (first O-ring) 122, when a writing pressure is applied to the tip end of the ballpoint pen refill 108, the cylinder 117 and the airtight valve 119 are retracted relative to the piston 118 against the elastic force of the urging member (pressing coil spring) 120, and the inside of the pressure chamber (pressure space) 121 is sealed and compressed to be pressurized, and when the writing pressure to the ballpoint pen refill 108 is released, the airtight valve 119 advances relative to the piston 118 prior to the cylinder 117, thereby forming the air passage 124 that communicates the pressure chamber (pressure space) 121 and the outside. Therefore, even if the ink for a writing instrument in the ink containing cylinder 110 is consumed by writing, the pressure in the pressurizing chamber (pressurizing space) 121 is reduced, and after the airtight state of the pressurizing chamber (pressurizing space) 121 is released, the relative positions of the airtight valve 119, the cylinder 117, and the piston 118 are returned to the state before the pen pressure is applied, so that the inside of the pressurizing chamber (pressurizing space) 121 can be prevented from being in a negative pressure state in which the air pressure is lower than the atmospheric pressure, and the ink can be prevented from flowing back by sucking the air from the tip end of the ballpoint pen tip 113.

When a pressure is applied to the distal end of the ballpoint pen refill 108, the pressing type writing instrument 101 of the present embodiment brings the airtight deformation portion (second O-ring) 123 of the airtight valve 119 into contact with the contact portion of the cylinder 117, thereby bringing the inside of the pressure chamber (pressure space) 121 into an airtight state, and when the pressure to the ballpoint pen refill 108 is released, the fitting force generated between the piston 118 and the cylinder 117 by the airtight member (first O-ring) 122 is larger than the fitting force generated between the contact portion of the airtight valve 119 and the cylinder 117 by the airtight deformation portion (second O-ring) 123 of the airtight valve 119, and thereby the airtight valve 119 advances relative to the piston 118 earlier than the cylinder 117.

In this pressurized writing instrument 101, the cylinder 117 pushed and retracted by the airtight valve 119 when the writing pressure is applied is not moved forward by the airtight member (first O-ring) 122 due to the fitting force generated between the cylinder and the piston 118 when the writing pressure is released, the airtight deformation portion (second O-ring) 123 of the airtight valve 119 and the front inner end portion of the cylinder 117 are separated by releasing the contact state, and an air passage 124 communicating with the outside is formed between the airtight deformation portion (second O-ring) 123 and the front inner end portion, whereby the airtight state in the pressurizing chamber (pressurizing space) 121 can be released before the cylinder 117 is moved forward when the writing pressure is released.

In the present embodiment, when the pen pressure is released, the fitting force generated between the airtight valve 119 and the front inner end portion of the cylinder 117 by the airtight deforming portion (second O-ring) 123 and the fitting force generated between the piston 118 and the cylinder 117 by the airtight member (first O-ring) 122 refer to a pressing force required to slide the cylinder 117 with respect to the airtight member (first O-ring) 122 and a pressing force required to slide the cylinder 117 with respect to the piston 118, and each fitting force can be measured by using a push-pull force gauge.

Further, the deformation portion (second O-ring) 123 for air sealing of the air sealing valve 119 in the present embodiment may be integrally formed on the side surface of the air sealing valve 119 by two-color molding or the like, or may be formed by locking another member such as an O-ring having rubber elasticity. Further, as a material constituting the airtight deforming portion (second O-ring) 123, a synthetic resin having rubber elasticity such as silicone rubber, nitrile rubber, ethylene propylene diene rubber, fluorine resin, thermoplastic elastomer, etc. may be used, and as for the hardness thereof, it is preferable that the hardness of durometer a measured in JIS-K6235 be set to 20 or more and 90 or less so that the content of the pressurizing chamber (pressurizing space) 121 is easily brought into an airtight state when the O-ring is brought into contact with the front inner end portion of the cylinder 117.

Further, an airtight member (first O-ring) 122 disposed between the cylinder 117 and the piston 118 seals between the cylinder 117 and the piston 118 to form an airtight state, and is preferably fixed to one of the cylinder 117 and the piston 118 so as to generate an appropriate frictional force between the cylinder 117 and the piston 118, and is preferably locked to an outer peripheral portion of the piston 118 in consideration of ease of assembly. Further, similarly to the airtight deforming portion (second O-ring) 123 of the airtight valve 119, the airtight member (first O-ring) 122 may be integrally formed by two-color molding or the like on the outer surface of the piston 118 or the inner surface of the cylinder 117.

Further, as a material constituting the airtight member (first O-ring) 122, a synthetic resin having rubber elasticity such as silicone rubber, nitrile rubber, ethylene propylene diene rubber, fluorine resin, thermoplastic elastomer, etc. can be used, and as for its hardness, it is preferable that the hardness of durometer a measured in JIS-K6235 be 20 or more and 70 or less.

The pressure writing instrument 101 of the present embodiment is configured to pressurize the air in the closed pressurizing chamber (pressurizing space) 121 in contact with the rear end of the writing instrument ink stored in the ink storage tube 110 so that the air pressure is higher than the atmospheric pressure, thereby easily discharging the writing instrument ink, and the degree of pressurization may be appropriately set according to the properties such as the viscosity of the writing instrument ink and the structure of the ballpoint pen tip 113.

In addition, when the atmospheric pressure is 1000hPa, for example, in a writing instrument ink having a low viscosity (for example, a writing instrument ink having a viscosity of 1mPa · s to 2000mPa · s in an environment at 20 ℃), the ink can be easily discharged by setting the pressure of the sealed air in the pressurizing chamber (pressurizing space) 121 to a pressurized state in the range of 1500hPa in which the atmospheric pressure exceeds 1005 hPa.

The pressure writing tools 1, 100, and 101 can be implemented without being limited to the types of ink such as oil-based ink and aqueous ink. In particular, when an aqueous ink or a shear thinning aqueous ink is used, the ink discharge amount is increased or decreased by pressurization, and the difference due to the change in the pressurization force such as the thickness or width of the handwriting and the gradation of the handwriting is large, and therefore, the ink can be used favorably. Further, when a thermochromic ink using a microcapsule pigment is used as an ink, generally, the ink discharge amount is desired to be increased because the writing tends to be thin, but when the ink discharge amount is high, the influence on the writing distance is also large, and therefore, the present invention in which the pressurizing force is variable can be favorably used in combination with the application.

Next, a modification of embodiment 2 will be described with reference to fig. 30 to 35. In the following description and the drawings used in the following description, the same reference numerals as those used for corresponding portions in embodiment 2 are used for portions that can be configured in the same manner as in embodiment 2, and redundant description is omitted. Note that, in the case where the operational effects obtained in embodiment 2 are also obtained in the modification, description thereof may be omitted.

Fig. 30 is a partial vertical cross-sectional view showing the pressing type writing instrument 201 of the present modification, and shows the pressing type writing instrument 201 in a state where the rotating body 106 is pushed forward. Fig. 31 is a view showing a cross section of the pressing type writing instrument 201 corresponding to the line XXXI-XXXI in fig. 30, fig. 32 is an exploded view showing each member constituting the pressing mechanism and the pressing force adjusting mechanism of the pressing type writing instrument 201, and fig. 33 is a longitudinal sectional view showing the rotating body 106 of the pressing type writing instrument 201 in an enlarged manner.

In the pressurized writing instrument 201 of the present modification, an example will be described in which a thermochromic ink is used as the writing instrument ink composition 111 filled in the ballpoint pen core 108. The ink composition (ink) 111 for a writing instrument of the present modification example is a reversible thermal discoloration ink containing a reversible thermal discoloration microcapsule pigment. Therefore, the formed handwriting has thermal discoloration, and is discolored or decolored by heating or cooling. Further, without being limited thereto, as the ink composition (ink) 111 for writing instruments, other ink compositions than thermochromic ink may also be used.

The average particle diameter of the microcapsule pigment is preferably 0.1 to 5.0. mu.m, more preferably 0.1 to 4.0. mu.m, and still more preferably 0.5 to 3.0. mu.m. By setting the average particle diameter of the microcapsule pigment to the above numerical range, the writing feeling of the writing instrument of the present invention can be made smoother while maintaining the high-concentration color developability. The particle size and particle size distribution can be measured by, for example, the coulter method (electric detection belt method). Specifically, the particle diameter is measured using a precision distribution measuring apparatus (Multisizer 4e manufactured by beckmann coulter), and the average particle diameter (median particle diameter) is calculated on a volume basis from the value. Alternatively, a laser diffraction/scattering particle size distribution measuring apparatus (manufactured by horiba, ltd.); LA-300, and the mean particle diameter (median particle diameter) was calculated on a volume basis from the corrected value using the standard sample.

The content of the reversible thermal discoloration-reversible microcapsule pigment is preferably 5 to 40% by mass, more preferably 10 to 40% by mass, and still more preferably 15 to 35% by mass, based on the total amount of the ink composition. When the content of the reversible thermal discoloration microcapsule pigment is in the above numerical range, the color developability can be improved while maintaining the ink outflow property.

The color change temperature of the reversible thermal color-changeable ink is appropriately set according to the purpose thereof or the like. For example, in the case of using a reversible thermal discoloration ink which is decolorized by heating, the temperature for decolorization by heating is preferably set to 25 to 95 ℃, more preferably 36 to 90 ℃. More specifically, the high temperature side color change point [ complete decoloring temperature (t4) ] can be set to a range of 25 ℃ to 95 ℃, preferably 36 ℃ to 90 ℃, and the low temperature side color change point [ complete coloring temperature (t1) ] can be set to a range of-30 ℃ to +20 ℃, preferably-30 ℃ to +10 ℃. With this configuration, the color can be effectively maintained in a normal state (a daily life temperature range), and the handwriting can be easily erased by heating, specifically, heating by frictional heat of the friction member 125 and the like described later.

In the present modification, a friction body is provided at the rear end of the rotating body 106. In particular, in the example shown in fig. 30, the tail plug 125 is configured as a friction body. Accordingly, in the present modification, the tail plug 125 is also referred to as a friction body 125. The friction body 125 is fixed to the rotating body 106 so as not to rotate and not to move back and forth. The friction member 125 is used, for example, to rub the handwriting of the ink composition 111 for a writing instrument having thermal discoloration and discolor (decolor) the handwriting by frictional heat generated at that time. The friction member 125 may be a friction member such as a sand eraser, for example. The friction body 125 is made of, for example, an elastic material, and can be fixed to the rear end of the rotating body 106 by press-fitting, engagement, screwing, fitting, adhesion, or two-color molding.

The pressurized writing instrument 201 of the present modification includes the stopper member 170 disposed between the rotating body 106 and the piston 118. The stopper member 170 is a member having the following functions: the rotation of the rotating body 106 is permitted in a state where the rear end of the shaft tube 104 is directed upward (fig. 30), and the rotation of the rotating body 106 is prevented in a state where the rear end of the shaft tube 104 is directed downward (fig. 34). Here, the lower side means a direction in which gravity acts, and the upper side means a direction opposite to the lower side, that is, a direction opposite to the direction in which gravity acts. The state in which the rear end of the shaft tube 104 is directed upward means a state in which the rear end of the shaft tube 104 is positioned above the front end of the shaft tube 104, and the state in which the rear end of the shaft tube 104 is directed downward means a state in which the rear end of the shaft tube 104 is positioned below the front end of the shaft tube 104. Further, the rotation of the rotating body 106 allowed in the state where the rear end of the barrel 104 is directed upward includes not only the rotation of the rotating body 106 allowed in the entire state where the rear end of the barrel 104 is located on the upper side than the front end of the barrel 104 but also the rotation of the rotating body 106 allowed in a partial state where the rear end of the barrel 104 is located on the upper side than the front end of the barrel 104. Similarly, the interference with the rotation of the rotating body 106 in the state where the rear end of the barrel 104 is directed downward includes interference with the rotation of the rotating body 106 not only in the entire state where the rear end of the barrel 104 is located on the lower side than the front end of the barrel 104 but also in a partial state where the rear end of the barrel 104 is located on the lower side than the front end of the barrel 104.

In the example shown in fig. 30 and 32, the stopper member 170 includes a body portion 170a, a guided portion 170b located forward of the body portion 170a, and a protruding portion 170c provided on the outer peripheral surface of the body portion 170 a. The body portion 170a has a substantially cylindrical shape. The guided portion 170b extends linearly forward from the front portion of the body portion 170 a. As shown in fig. 31, in a cross section perpendicular to the extending direction of the guided portion 170b, the guided portion 170b has a substantially rectangular shape, particularly a substantially square shape, in outline. Further, the cross section of the guided portion 170b has a contour of a fixed shape along the extending direction of the guided portion 170 b. That is, any 2 cross sections of the guided portion 170b perpendicular to the extending direction of the guided portion 170b have the same shape profile as each other.

The protruding portion 170c is formed to protrude radially from the cylindrical outer circumferential surface of the body portion 170 a. In the illustrated example, the protrusion 170c linearly extends in the front-rear direction. Therefore, the direction in which the guided portion 170b extends and the direction in which the protruding portion 170c extends are parallel to each other. The projections 170c are arranged at equal angular intervals in the circumferential direction. In the example shown in fig. 35, the stopper member 170 has 2 protruding portions 170c, and the protruding portions 170c are arranged at an angular interval of 180 degrees from each other. The stopper member 170 may have 1 protrusion 170c, or 3 or more protrusions 170 c.

The stopper member 170 has a through hole 170d that penetrates the body portion 170a and the guided portion 170b in the front-rear direction. The through-hole 170d is open at the rear end surface of the body portion 170a and the front end surface of the guided portion 170 b. The through-hole 170d is not an essential component, and the stopper member 170 may not have the through-hole 170 d. That is, the stopper member 170 may be formed as a solid member.

As shown in fig. 30 to 32, the piston 118 includes a guide portion 118h, and the guide portion 118h guides a guided portion 170b of the stopper member 170 so as to be movable forward and backward. The guide portion 118h extends in the front-rear direction in the piston 118, and is formed as a hole that opens at the rear end surface of the piston 118. In a cross section perpendicular to the extending direction of the guide portion 118h, the guide portion 118h has a contour in a shape complementary to the guided portion 170b of the stopper member 170. That is, in a cross section perpendicular to the extending direction of the guide portion 118h, the guide portion 118h has a substantially rectangular shape, particularly a substantially square shape in outline. Thereby, the stopper member 170 is held to be movable forward and backward and not to be rotatable with respect to the piston 118. Further, the guide portion 118h has a profile of a fixed shape in cross section along the extending direction of the guide portion 118 h. That is, any 2 cross sections of the guide portion 118h perpendicular to the extending direction of the guide portion 118h have profiles of the same shape as each other.

As shown in fig. 33, a regulating portion 106h for regulating the movement of the projecting portion 170c of the stopper member 170 is provided on the inner peripheral surface of the rotating body 106. The number of the restricting portions 106h is the same as the number of the protruding portions 170c of the stopper member 170. That is, in the present modification, 2 restricting portions 106h are provided along the circumferential direction of the rotating body 106 so as to have an angular interval of 180 degrees therebetween. The illustrated regulating portion 106h includes a 1 st groove portion 106i and a plurality of 2 nd groove portions 106j located behind the 1 st groove portion 106i and communicating with the 1 st groove portion 106 i. The 1 st groove portion 106i extends linearly in the front-rear direction and has a constant width in the circumferential direction of the rotating body 106. The 2 nd groove portion 106j is provided corresponding to the number of the step portions 105f of the first cam slope 105e and the step portions 118e of the second cam slope 118 d. That is, in the present modification, 32 nd groove portions 106j are provided for 1 st groove portion 106 i. The 2 nd groove portions 106j extend linearly in the front-rear direction and are arranged along the circumferential direction of the rolling body 106. Each of the 2 nd groove portions 106j has a constant width along the circumferential direction of the rotating body 106 at least in a predetermined range on the front side (on the side close to the 1 st groove portion 106 i). The width of the 2 nd groove portion 106j in the predetermined range along the circumferential direction is set to a size to which the protruding portion 170c of the stopper member 170 can smoothly move forward and backward in the 2 nd groove portion 106 j. On the other hand, from the viewpoint of appropriately suppressing the rotation of the friction body 125 when handwriting is rubbed using the friction body 125, it is preferable that the dimension of play in the circumferential direction that may be generated between the 2 nd groove portion 106j and the protruding portion 170c is as small as possible.

Next, a method of erasing handwriting using the pressure writing tool 201 of the present modification will be described with reference to fig. 34 and 35. Fig. 34 is a diagram showing a state in which the rear end of the pressure writing tool 201 is directed downward in order to erase the handwriting, and fig. 35 is a diagram showing the pressure writing tool 201 in a cross section corresponding to the line XXXV-XXXV in fig. 34.

As shown in fig. 30, in a state where the rear end of the shaft tube 104 is directed upward, the stopper member 170 is positioned on the front side due to the action of gravity. At this time, the front end of the body portion 170a or the front end of the guided portion 170b of the stopper member 170 abuts against the piston 118, and at least the front side portion of the guided portion 170b is positioned in the guide portion 118h of the piston 118. Further, the protruding portion 170c of the stopper member 170 is located in the 1 st groove portion 106i of the restricting portion 106h of the rotating body 106. Therefore, the protrusion 170c can move in the circumferential direction within the range of the width of the 1 st groove portion 106 i. That is, the rotating body 106 can rotate relative to the stopper member 170 and the piston 118 within the range of the width of the 1 st groove portion 106 i. Thus, the stopper member 170 allows the rotation of the rotating body 106 in a state where the rear end of the shaft tube 104 is directed upward. Therefore, in a state where the rear end of the shaft tube 104 is directed upward, as described above with reference to fig. 27A to 27C, the pressing force applied to the writing instrument ink composition (ink) 111 can be adjusted by rotating the rotary member 106 and operating the pressing force adjustment mechanism 160.

When the handwriting of the writing instrument ink composition (ink) 111 is rubbed with the rubbing member 125 to change the color (erase the color) of the handwriting, the user directs the rubbing member 125 downward as shown in fig. 34. That is, the rear end of the shaft tube 104 is directed downward. Thereby, the stopper member 170 moves rearward due to the gravity. At this time, the protrusion 170c of the stopper member 170 enters one of the plurality of 2 nd groove portions 106j of the regulating portion 106h of the rotating body 106 (see fig. 35). Specifically, the protrusion 170c enters the 2 nd groove 106j corresponding to the position (see fig. 14) of the alignment mark 106f indicated by the pressing force display unit 102 h. In other words, the protrusion 170C enters the 2 nd groove 106j corresponding to the fitting position of the first cam protrusion 106b with respect to the stepped portions 105f1 to 105f3 (see fig. 28A to 28C) of the first cam slope 105 e. In other words, the protrusion 170C enters the 2 nd groove 106j corresponding to the fitting position of the second cam protrusion 106d with respect to the stepped portions 118e1 to 118e3 (see fig. 28A to 28C) of the second cam slope 118 d. The 2 nd groove portion 106j has a width in the circumferential direction smaller than that of the 1 st groove portion 106i, and thus hinders the rotation of the rotating body 106 in a state where the rear end of the shaft tube 104 is directed downward. Therefore, when the rear end of the barrel 104 is directed downward and the projection 170c of the stopper member 170 enters one of the plurality of 2 nd groove portions 106j of the regulating portion 106h, the pressing force applied to the writing instrument ink composition (ink) 111 cannot be adjusted by rotating the rotating body 106. That is, in this case, when the handwriting is rubbed by the friction body 125, the rolling body 106 rotates together with the friction body 125, and the pressing force applied to the writing instrument ink composition (ink) 111 can be prevented from being changed regardless of the intention of the user.

In the pressure writing instrument 201 of the present modification, the writing instrument ink composition (ink) 111 is a thermochromic ink, and the pressure writing instrument 201 further includes: a friction member 125 provided at a rear end of the rotating member 106 and capable of changing a color of a handwriting of the thermochromic ink by friction with frictional heat generated at the time; and a stopper member 170 that allows the rotation of the rotating body 106 in a state where the rear end of the shaft tube 104 is directed upward, and prevents the rotation of the rotating body 106 in a state where the rear end of the shaft tube 104 is directed downward.

According to the pressure-type writing instrument 201, the pressing force applied to the writing instrument ink composition (ink) 111 can be adjusted by operating the pressing force adjusting mechanism 160 by rotating the rotary body 106 with the rear end of the barrel 104 directed upward. On the other hand, when the rear end of the barrel 104 is directed downward and the handwriting is erased by the friction body 125, the rotation of the rotating body 106 due to the friction of the handwriting by the friction body 125 is prevented, and the pressing force applied to the writing instrument ink composition (ink) 111 can be prevented from being unintentionally changed.

Claims (9)

1. A pressurized writing instrument, comprising:

a shaft tube capable of accommodating therein a refill filled with an ink composition for a writing instrument;

a pressurizing mechanism that applies pressure to the writing instrument ink composition as the pen core retreats;

a pressure adjustment mechanism that adjusts the pressure; and

a rotating body provided to protrude from a rear end of the shaft cylinder,

the pressurizing force adjusting mechanism adjusts the pressurizing force by rotating the rotating body,

the pressurizing force adjusting mechanism is configured such that the relative position of the writing lead with respect to the shaft tube in the axial direction does not change before and after the rolling of the rolling element.

2. A pressure-type writing instrument comprising a ballpoint pen refill which is housed in a barrel and has an ink container filled with an ink composition for writing instruments and a ballpoint pen tip at the front of the ink container,

a pressurizing mechanism is disposed behind the ballpoint pen refill, and the pressurizing mechanism applies pressure to the rear end of the writing instrument ink composition by retracting the ballpoint pen refill by applying pen pressure,

a rolling element protruding from a rear end of the shaft tube and a pressurizing force adjusting mechanism that is operated by rotating the rolling element to adjust a retraction amount of the ballpoint pen refill,

the pressurizing mechanism is locked in a manner of freely moving back and forth and being incapable of rotating relative to the shaft cylinder,

the rotating body is locked to the shaft cylinder in a freely rotatable manner,

the pressurizing force adjusting mechanism is operated by rotating the rotating body to adjust the pressurizing force applied to the rear end of the writing instrument ink composition in the ink cartridge, and the relative position of the ballpoint pen refill with respect to the shaft barrel in the axial direction does not change before and after the rotating body is rotated.

3. The pressurized writing instrument of claim 2,

a slide member is disposed inside the shaft tube, the slide member being locked to the shaft tube so as to be movable forward and backward and unrotatable,

the sliding member includes: the pressurizing mechanism is arranged on the inner side of the sliding component; and the rolling body, which is configured to partially protrude backwards from the rear end opening part of the sliding component,

by pressing the rolling member forward, the tip end portion of the ballpoint pen refill protrudes from the tip end opening portion of the shaft tube.

4. The pressurized writing instrument of claim 3,

the pressurizing force adjusting mechanism includes: the sliding component; a rotating body inserted from a front end opening of the sliding member and locked to the sliding member so as to be rotatable and movable forward and backward; and a sliding member which is disposed inside the rotating body and is locked to the rotating body so as to be rotatable and movable forward and backward,

a first cam mechanism for moving the rotating body forward and backward with respect to the sliding member is provided between the sliding member and the rotating body, and a second cam mechanism for moving the sliding member forward and backward with respect to the rotating body is provided between the rotating body and the sliding member.

5. The pressurized writing instrument of claim 4,

the first cam mechanism has a first cam slope inclined with respect to the axial direction and extending in the axial direction on an inner surface of the slide member, a first cam protrusion formed to be in sliding contact with the first cam slope on an outer surface of the rotating body,

the second cam mechanism has a second cam slope inclined with respect to the axial direction and extending in the axial circumferential direction on an outer surface of the sliding member, and has a second cam protrusion formed on an inner surface of the rotating body so as to be in sliding contact with the second cam slope.

6. The pressurized writing instrument according to claim 4 or 5,

the pressurizing mechanism includes: a cylindrical body having a through hole penetrating in the front-rear direction; an elastic member disposed inside the cylindrical body, a rear end portion of the ballpoint pen refill being detachably attached to the elastic member; a pressurizing chamber formed between an inner wall of the elastic member and a rear end portion of the ink containing cylinder and communicating with an inside of a rear end opening portion of the ink containing cylinder; a fixing member disposed inside the cylindrical body and behind the elastic member; and an air hole for communicating the pressurizing chamber with the outside,

the cylindrical body is locked in a manner of freely moving back and forth and being incapable of rotating relative to the sliding member, the sliding member is locked in a manner of freely moving back and forth and being incapable of rotating relative to the cylindrical body,

the tubular body is urged forward relative to the slide member by disposing an urging member between the rear inner step portion of the tubular body and the front inner step portion of the slide member,

the cylindrical body retreats together with the ballpoint pen refill, whereby the elastic member abuts against the anchor to deform the elastic member, and the pressure chamber compresses to apply pressure to the rear end of the ink composition in the ink storage cylinder.

7. A pressure-type writing instrument comprising a ballpoint pen refill which is housed in a barrel and has an ink container filled with an ink composition for writing instruments and a ballpoint pen tip at the front of the ink container,

a pressurizing mechanism is disposed behind the ballpoint pen refill, and the pressurizing mechanism applies pressure to a rear end of the ink composition for a writing instrument by retracting the ballpoint pen refill by applying a pen pressure, the pressurizing mechanism including: a rotating body provided to protrude from a rear end of the shaft cylinder; and a pressurizing force adjusting mechanism that adjusts the pressure, wherein,

the pressurizing mechanism includes: a cylinder formed in a cylindrical shape; an airtight valve having an airtight deformation portion on an outer peripheral surface thereof and formed to be movable forward and backward with respect to the cylinder; a piston which is assembled to a rear inner hole of the cylinder body in a freely movable manner forward and backward; an airtight member disposed between the piston and the cylinder; a pressurizing chamber surrounded by the cylinder, the airtight valve, the piston, and the airtight member, and communicating with a rear portion of the ballpoint pen refill; and an urging member which is disposed between the airtight valve and the piston and urges the airtight valve forward,

when a pressure is applied to the tip end of the ballpoint pen tip, the ballpoint pen refill retreats, the cylinder and the airtight valve retreat with respect to the piston against the elastic force of the urging member in conjunction with the retreat of the ballpoint pen refill, the cylinder and the airtight valve compress and pressurize the ball by closing the pressure chamber, and the airtight valve advances with respect to the piston before the cylinder after the pressure to the ballpoint pen refill is released, thereby forming an air passage that communicates the pressure chamber and the outside, the airtight state of the pressure chamber is released to become the same air pressure as the atmospheric pressure, and then the cylinder advances with a delay,

the pressurizing force adjusting mechanism adjusts the pressurizing force by rotating the rotating body,

the pressurizing force adjusting mechanism is configured such that the relative position of the ballpoint pen refill in the axial direction with respect to the barrel does not change before and after the rolling of the rolling element.

8. The pressurized writing instrument of claim 7,

when a pressure is applied to the distal end of the ballpoint pen refill, the airtight deforming portion of the airtight valve and the contact portion of the cylinder abut against each other, thereby bringing the inside of the pressurizing chamber into an airtight state, and when the pressure is released from the ballpoint pen refill, the fitting force generated between the piston and the cylinder by the airtight member is larger than the fitting force generated between the airtight deforming portion of the airtight valve and the contact portion of the cylinder, thereby advancing the airtight valve relative to the piston prior to the cylinder.

9. The pressure writing instrument according to any one of claims 1 to 5, 7 and 8, wherein,

the ink composition for a writing instrument is a thermochromic ink,

the pressurized writing instrument further includes:

a friction body provided at a rear end of the rotation body, and capable of rubbing the handwriting of the thermochromic ink and changing the color of the handwriting by using frictional heat generated at the time; and

and a stopper member that allows the rotation of the rotating body in a state where the rear end of the shaft tube is directed upward, and that prevents the rotation of the rotating body in a state where the rear end of the shaft tube is directed downward.

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