TWI794572B - ink inhaler - Google Patents

Abstract

Provides a mechanism that promotes the inflow of air into the ink container and allows the ink to flow smoothly out of the ink sucker.

The ink inhaler has: a main cylinder having a diameter-reduced portion on the inner surface, And an ink containing part is defined behind the reduced diameter part; the piston member is configured to move back and forth relative to the main cylinder; the pipe member extends inside the main cylinder through the reduced diameter part and is held so as to move forward and backward relative to the piston member; and The fixed block member is fixed to the pipe at the rear of the reduced diameter part. The inner surface of the main cylinder in front of the reduced diameter part has a front inclined surface inclined to the axial direction and the radial direction, or has a central axis of the aforementioned main cylinder. The in-plane extension of the front rib.

Description

ink inhaler

field of invention

The present invention relates to an ink inhaler used in writing utensils such as fountain pens.

Background of the invention

Conventionally, in writing implements such as fountain pens, an ink suction device is used, and the ink suction device sucks ink inside to store the ink, and supplies the ink to the nib when writing. The ink sucker has an ink accommodating portion and an ink suction mechanism for sucking ink from the ink accommodating portion.

The ink suction mechanism generally has a mechanism for generating negative pressure inside the ink suction device and sucking ink by utilizing the difference in air pressure between the inside and outside of the ink suction device. The method of generating negative pressure in the ink suction device can be, for example, a push-pull type, a rotary type, or a push type. This creates negative pressure in the ink sucker; the aforementioned rotary type rotates the operating member around the axis to move the piston member screwed with the operating member toward the rear, thereby generating negative pressure in the ink sucker; the aforementioned pressing type is The piston member provided at the rear of the ink sucker is pushed forward and opened to generate negative pressure in the ink sucker. In particular, in the push-type ink sucker, the length of the operating member can be reduced compared to the push-pull type or the rotary-type ink sucker. Thereby, the ink sucker of the same capacity can be miniaturized, or the ink sucker of the same size can be increased in capacity.

An ink suction device is disclosed in JP2017-209863A, which includes: an ink storage cylinder having a reduced diameter portion (inner section) and an ink storage chamber, a piston member disposed at the rear of the ink storage cylinder, and a piston member disposed at the ink storage chamber. A pipe member held in the barrel and held by the piston member, and a block member fixed to the pipe member.

In the conventional push-type ink sucker, the outflow of ink from the ink storage part (ink storage chamber) to the nib may not be carried out smoothly. For this reason, the inventors of this case have carefully examined and found that the conventional push-type ink inhaler has the following problems.

When the ink advances to the pen tip through the narrowed diameter portion, air flows into the ink storage portion through the narrowed diameter portion instead of the ink flowing out from the ink storage portion. However, at this time, the air does not properly flow into the ink storage portion, which hinders the smooth flow of ink from the ink storage portion. When this problem was further examined, it was found that the air going to the ink storage part stagnates in front of the constricted diameter part, hindering the inflow of the air into the ink storage part.

Summary of the invention

The present invention is made in consideration of such problems, and an object of the present invention is to provide an ink suction device that can promote the inflow of air into the ink storage portion and allow the ink to flow out smoothly.

The ink inhaler of the present invention comprises: a main cylinder having a diameter-reducing portion on the inner surface, and an ink accommodating portion is defined behind the diameter-reducing portion; a piston member configured to move back and forth relative to the main cylinder; a pipe member, The diameter-reducing portion extends inside the main cylinder and is held so as to be movable back and forth relative to the piston member; and the fixed block member is fixed to the pipe behind the diameter-reducing portion, and the main cylinder is at the diameter-reducing portion. The front inner surface has a front inclined surface inclined to the axial direction and the radial direction, or has a front rib extending in a plane including the central axis of the main cylinder.

In the ink inhaler of the present invention, the main cylinder may have the front inclined surface, and the front inclined surface may have a groove extending in a plane including the central axis of the main cylinder.

In the ink inhaler of the present invention, the main cylinder may have a plurality of the grooves arranged in the circumferential direction.

In the ink sucker of the present invention, the width of the circumferential direction of the groove portion may be reduced as it goes forward.

In the ink inhaler of the present invention, the main barrel may have the front rib, and the front rib may have a corner facing the center axis in a cross section perpendicular to the center axis.

In the ink inhaler of the present invention, the main cylinder may have the front rib, and in the front parallel portion parallel to the central axis of the inner surface, the front rib may include the front rib as it moves toward the rear. The portion where the distance from the central axis in the radial direction becomes smaller.

In the ink inhaler of the present invention, the main cylinder may have a plurality of the front ribs arranged in the circumferential direction.

In the ink sucker of the present invention, the distance between two adjacent front ribs in the circumferential direction may be 2.7 mm or more.

In the ink inhaler of the present invention, the main cylinder may have a rear rib extending in a plane including the central axis of the main cylinder on the inner surface of the ink container.

In the ink inhaler of the present invention, the main cylinder may have a plurality of the rear ribs arranged in the circumferential direction.

In the ink sucker of the present invention, the distance between two adjacent rear ribs in the circumferential direction may be 2.7 mm or more.

According to the present invention, it is possible to provide an ink suction device which can promote the inflow of air into the ink container and allow the ink to flow out smoothly.

10: Notebook

11: Shaft barrel

12: nib

13: Nib support

14: Ink circulation hole

15: Air circulation hole

16: Installation Department

20: Ink Inhaler

21: Ink storage part

25: Endow potential energy components

30: main barrel

30a: inner surface

30a1: rear parallel part

30a2: front parallel part

30b: Outer surface

31: Reduced diameter part

31a: rear inclined surface

31b: front inclined surface

32: Groove

33: Rear rib

34: front rib

35: corner

36: uneven part

40: tailpiece

42: Rear opening

44: Flange

50:Piston component

51: Convex flange

51a: front face

53: Concave

55: Connect convex part

57: hole

59: Through hole

60: Operating components

62: Connection recess

64: Convex

70: pipe fittings

72: front end

74: Rear end

76: Expanding part

80: Fixed block components

82: Occlusion surface

84: Rear end

86: upper edge

90: Movable block components

92: front end

94: upper edge

A: Central axis

D _53A : Inner diameter of recess

D _70B : Outer diameter of pipe fittings

D _90A : Inner diameter of the movable block member

D _90B : Outer diameter of movable block member

G1: Gap

G2: Gap

P: Stretch force

r: distance

S1: Interval

S2: Interval

T ₈₀ : Thickness in the radial direction of the rear end of the fixed block member

T ₉₀ : Thickness in the radial direction of the movable block member

θ: contact angle

Fig. 1 is a diagram for explaining an embodiment of the present invention, and shows a section of a writing instrument incorporating an ink suction unit.

Fig. 2 is a cross-sectional view enlargedly showing the ink sucker, particularly showing the ink sucker in an open state.

Fig. 3 is a sectional view showing the ink sucker in a state where its operating member is pushed forward.

Fig. 4 shows the ink sucker in a state where the pen tip is directed upward.

Fig. 5 is a sectional view showing the ink sucker in a state where the central axis is inclined to the vertical direction.

FIG. 6 shows a section corresponding to line VI-VI of FIG. 5 .

FIG. 7A shows an example of a cross section corresponding to line VII-VII of FIG. 5 .

FIG. 7B shows another example of a section corresponding to line VII-VII in FIG. 5 .

Fig. 8 is a sectional view showing a modified example of the ink sucker.

Fig. 9 is a sectional view corresponding to line IX-IX of Fig. 8 .

Fig. 10 is a sectional view corresponding to line X-X of Fig. 8 .

Detailed Description of the Preferred Embodiment

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In addition, in the drawings attached to this specification, for the convenience of illustration and easy understanding, these members of the real thing are appropriately changed and the scale and aspect ratio are exaggerated.

In addition, terms such as "parallel", "orthogonal", "same", etc., or values of length or angle used in this specification are not intended to be used in a strict sense. not to be limited, but to be construed to include the extent to which the same function can be expected.

1 to 10 are diagrams illustrating an embodiment of the present invention. Wherein, Fig. 1 shows the cross-section of the writing instrument 10 that has been loaded into the ink sucker 20, and Fig. 2 shows the enlarged ink sucker 20, and Fig. 3 shows that the ink sucker is pushed forward with its operating member 60 to display the ink. Cross-sectional view of inhaler 20. In this embodiment, an example in which the writing instrument 10 is a fountain pen is described, but the writing instrument 10 is not limited to the fountain pen. In this specification, the direction in which the central axis A of the main cylinder 30 of the ink sucker 20 extends (longitudinal direction) is defined as the axial direction, and the direction perpendicular to the central axis A is defined as the radial direction, so as to surround the central axis A. of The circumferential direction is the circumferential direction. Also, in the writing tool 10 and the ink inhaler 20, along the axial direction, the side (for example, the lower side in FIG. 1 ) close to the written surface such as paper when writing is the front, and the side away from the written surface (such as the lower side in FIG. 1 ) is the front. 1) is the rear.

The writing instrument 10 shown in FIG. 1 includes: a barrel 11 ; a pen tip 12 ; The shaft cylinder 11 is a member having a longitudinal direction along the central axis A, and has a cavity opened toward the front inside. In this embodiment, at least a part of the ink suction unit 20 is accommodated in the cavity of the shaft cylinder 11 . The nib 12 is a member that forms handwriting on the surface to be written with the ink supplied from the ink sucker 20 . The nib support portion 13 has an ink circulation hole 14 and an air circulation hole 15 inside. The ink circulation hole 14 communicates with the nib 12 and functions as a path for guiding the ink supplied from the ink sucker 20 to the nib 12 . The air circulation hole 15 extends substantially along the axial direction and opens near the pen tip 12 . The air circulation hole 15 functions as a passage for guiding the external air flowing in from the opening to the ink suction unit 20 . A mounting portion 16 to which the ink sucker 20 is mounted is formed on the nib support portion 13 . In this embodiment, the mounting portion 16 is configured as a protruding portion toward the rear, and the ink suction device 20 is detachably mounted on the nib support portion 13 by fitting the front end of the ink suction device 20 onto the mounting portion 16 . Moreover, it is not limited thereto, the mounting portion 16 can also be configured as a groove opening at the rear, and the front end of the ink sucker 20 is pressed into the mounting portion 16 , whereby the ink sucker 20 is mounted on the nib support portion 13 . A male thread portion is formed on the rear outer surface of the nib support portion 13 , and a corresponding female thread portion is formed on the front inner surface of the shaft barrel 11 . Next, the female thread portion of the shaft barrel 11 is screwed to the male thread portion of the nib support portion 13 , and the shaft barrel 11 is attached to the nib support portion 13 .

The ink sucker 20 of the present embodiment is a push-type ink sucker, and has an ink container 21 inside to accommodate ink supplied by the conventional pen tip 12 . The ink sucker 20 is provided with: a main cylinder 30 defining the ink storage portion 21, a piston member 50 arranged to be movable back and forth relative to the main cylinder 30, a pipe member 70 held so as to be movable back and forth relative to the piston member 50, and a pipe member 70 fixed to the The block member 80 of the pipe 70 is fixed. In the illustrated example, the ink inhaler 20 further has: the tail cylinder 40 installed on the rear of the main cylinder 30, the operating member 60 installed on the rear of the piston member 50, and the pipe fitting 70 is loosely embedded in the rear of the fixed block member 80. movable block member of 90. Hereinafter, each member constituting the ink suction unit 20 of this embodiment will be described in order.

The main cylinder 30 is a member having a substantially cylindrical shape, and has an inner surface 30a and an outer surface 30b extending in the axial direction. The inner surface 30a has a reduced-diameter portion 31 whose inner diameter is reduced. The reduced-diameter portion 31 is a protruding portion formed in an annular shape along the circumferential direction on the inner surface 30a. In particular, the reduced-diameter portion 31 is a protruding portion in which the inner surface 30a protrudes toward the central axis A. As shown in FIG. The ink storage portion 21 is formed behind the reduced diameter portion 31 . At the rear of the top of the reduced-diameter portion 31 closest to the central axis A, a rear inclined surface 31a facing the ink container 21 and inclined to the axial direction and the radial direction is formed. The front inclined surface 31b inclined in the direction and the radial direction. The rear inclined surface 31a is a surface extending radially outward as it goes rearward, and the front inclined surface 31b is a surface extending radially outward as it goes forward.

On the outer surface 30b of the main cylinder 30, a concavo-convex portion 36 is provided. One example of the concave-convex portion 36 includes convex portions and/or concave portions extending in the circumferential direction. The concave-convex portion 36 serves as an anti-slip function when the ink sucker 20 is attached to and detached from the mounting portion 16 of the nib support portion 13 . That is, the user can easily and stably attach and detach the pen point support portion 13 by holding the concave-convex portion 36 .

At the rear of the main cylinder 30, a tail cylinder 40 is installed. The tailpiece 40 is used for accommodating at least a part of the operating member 60 . A flange portion 44 protruding inward is formed at the rear end opening portion 42 of the transition piece 40 , and the flange portion 44 abuts on a later-described convex portion 64 of the operation member 60 in the open state of the operation member 60 . The flange portion 44 may be a single protrusion provided along the circumferential direction including the entire circumference, or may be a plurality of protrusions arranged in a dispersed manner in the circumferential direction.

The piston member 50 has a convex flange portion 51 and a coupling convex portion 55 provided behind the convex flange portion 51 . The convex flange portion 51 is located inside the main cylinder 30 , and the radially outermost end portion of the convex flange portion 51 is in liquid-tight contact with the inner surface 30 a of the main cylinder 30 . Thereby, the ink containing portion 21 is defined as a space surrounded by the inner surface 30 a of the main cylinder 30 , the reduced diameter portion 31 and the convex flange portion 51 of the piston member 50 . The convex flange part 51 has the recessed part 53 recessed rearward from the front-end surface 51a. The connecting convex portion 55 functions as a connecting portion that connects the piston member 50 to the operating member 60 . The connection convex part 55 is provided with the hole 57 opened rearward. piston The member 50 has a through-hole 59 on the central axis A that communicates the recessed portion 53 and the hole 57 . The pipe member 70 is freely inserted into the through hole 59 . That is, the inner diameter of the through hole 59 is larger than the outer diameter of the main body of the pipe 70 , whereby the pipe 70 is held so as to be movable back and forth relative to the piston member 50 . The hole 57 serves as an introduction portion when the tube 70 is inserted into the through hole 59 , and defines a movable range when the tube 70 moves back and forth relative to the piston member 50 . In addition, in order to ensure the smooth flow of ink or air between the ink storage portion 21 and the hole 57, the through hole 59 may have a notch that is notched in the radial direction.

The operation member 60 is a member operated by the user when restricting the forward and backward movement of the piston member 50 and moving the piston member 50 back and forth with respect to the main cylinder 30 . The operation member 60 is opened on the front end surface, and has the connection recessed part 62 which fits the connection convex part 55 of the piston member 50. As shown in FIG. In the illustrated example, an engaging concave portion is provided on the side surface of the coupling concave portion 62 , and an engaging convex portion corresponding to the engaging concave portion of the coupling concave portion 62 is provided on the side surface of the coupling convex portion 55 . Then, the coupling convex portion 55 is inserted into the coupling concave portion 62 , and the engaging convex portion of the coupling convex portion 55 is engaged with the engaging concave portion of the coupling concave portion 62 , whereby the piston member 50 is coupled to the operation member 60 . The connecting convex portion 55 of the piston member 50 is attached liquid-tightly to the connecting concave portion 62 so that the ink flowing into the hole 57 does not leak to the outside. On the outer peripheral surface of the operation member 60, a convex portion 64 protruding outward in the radial direction is provided. Between the main cylinder 30 and the convex part 64, the potential energy imparting member 25 is arrange|positioned. In the illustrated example, the potential energy imparting member 25 is a coil spring, and is inserted between the rear end of the main cylinder 30 and the front end of the protrusion 64 in a state compressed in the axial direction. Thereby, the operation member 60 functions as a member that imparts potential energy toward the rear to the main cylinder 30 . The convex portion 64 abuts against the flange portion 44 of the transition piece 40 from the front in the open state of the operation member 60 (state not pushed forward by the user). Therefore, the rear end of the movable range of the operation member 60 is defined by the flange portion 44 .

The tube 70 is disposed so as to extend inside the main tube 30 through the narrowed portion 31 . In any one of the open state (see FIG. 2 ) and the pushed state (the state pushed forward by the user, see FIG. 3 ) of the operation member 60 , the front end portion 72 of the tube 70 is located in front of the reduced diameter portion 31 . At the rear end portion 74 of the pipe member 70 , an enlarged diameter portion 76 is formed where the main body of the pipe member 70 expands in the radial direction. The outer diameter of the enlarged diameter portion 76 is larger than the through hole of the piston member 50 The inner diameter of 59 is also large. Furthermore, the outer diameter of the pipe 70 other than the enlarged diameter portion 76 is smaller than the inner diameter of the through hole 59 . Therefore, the tube 70 is movable in the front-rear direction while being inserted into the through-hole 59 , and is positioned at the front with respect to the piston member 50 when the enlarged-diameter portion 76 is engaged with the through-hole 59 from behind. The inside of the pipe member 70 is hollow, and through the pipe member 70 , the portion closer to the front than the diameter-reduced portion 31 of the main cylinder 30 communicates with the hole 57 of the piston member 50 . The material forming the tube 70 is not particularly limited, but a metal material such as stainless steel can be used as an example.

The fixing block member 80 fixes the pipe 70 behind the reduced-diameter portion 31 . More specifically, the fixing block member 80 is fixed to the outer surface of the tube 70 in the rear of the reduced diameter portion 31 . The fixed block member 80 is formed of an elastic material. As an example of the elastic material, fluororubber can be used. The fixed block member 80 has a blocking surface 82 at the front. In the illustrated example, the blocking surface 82 includes a surface inclined in the axial direction and the radial direction at a distance from the tube 70 in the radial direction as it goes rearward. The closing surface 82 abuts against the rear inclined surface 31 a of the reduced diameter portion 31 to close the reduced diameter portion 31 when the tube 70 and the fixed block member 80 move forward.

The movable block member 90 is loosely fitted in the pipe 70 in the rear of the fixed block member 80 . That is, the movable block member 90 is movable in the front-rear direction along the tube 70 behind the fixed block member 80 . The movable block member 90 is formed in a cylindrical shape as a whole, and the pipe 70 is inserted inside. The material forming the movable block member 90 is not particularly limited, and a metal material such as stainless steel can be used as an example.

In the above-mentioned ink sucker 20 in the open state as shown in FIG. 2 , the operating member 60 is biased backward by the biasing member 25 . The convex portion 64 provided on the outer peripheral surface of the operating member 60 abuts against the flange portion 44 provided on the rear end opening 42 of the transition piece 40 from the front, thereby restricting the further rearward movement of the operating member 60 . At this time, the piston member 50 connected to the operating member 60 , the pipe 70 held by the piston member 50 , the fixed block member 80 fixed to the pipe 70 , and the movable block 90 loosely fitted in the pipe 70 are also positioned behind.

When sucking ink into the ink storage part 21 of the ink sucker 20, prepare an ink bottle or the like storing ink, and in the state where the ink sucker 20 is attached to the nib support part 13, turn the nib 12 toward the pen tip. Downward, dip the nib support part 13 into the ink until the ink circulation hole 14 and the air circulation hole 15 are located below the liquid surface of the ink.

In the state where the operation member 60 faces upward, for example, when the operation member 60 is pushed forward (downward) by a user's finger, the pressed state is as shown in FIG. 3 . When changing from the open state to the pushed state, as the operation member 60 moves forward, the piston member 50, the tube 70, the fixed block member 80, and the movable block member 90 also move forward. In this movement, first, the closing surface 82 of the fixed block member 80 abuts against the rear inclined surface 31 a of the reduced diameter portion 31 to close the reduced diameter portion 31 . Thereby, the tube 70, the fixed block member 80, and the movable block member 90 stop. Furthermore, when the operation member 60 moves forward, the piston member 50 moves further forward. At this time, the air compressed in the ink container 21 passes through the gap between the through hole 59 of the piston member 50 and the tube 70 , and flows out from the front end 72 of the tube 70 through the hole 57 and the cavity in the tube 70 . The air flowing out from the tube 70 is discharged to the outside through the nib support 13 . Furthermore, if the through-hole 59 of the piston member 50 has a notch portion notched in the radial direction, since the circulation of the air between the ink accommodating portion 21 and the hole 57 is sufficiently ensured, the flow from the ink accommodating portion 21 to the hole 57 can be quickly and stably carried out. Exhaust of air from section 21.

In this state, for example, when the user's finger who has pushed the operation member 60 forward is released to release the pushing force applied to the operation member 60, the force applied to the potential energy member 25 can be operated. The member 60 will retreat rapidly. Along with this, the piston member 50 also retreats rapidly, and the pressure in the ink storage portion 21 becomes a negative pressure. When the operating member 60 and the piston member 50 retreat further, the enlarged diameter portion 76 provided at the rear end 74 of the pipe fitting 70 is locked in the through hole 59 of the piston member 50, and the pipe fitting 70, the fixed block member 80 and the movable block member 90 are connected to the piston. The members 50 retreat together. When the blocking surface 82 of the fixed block member 80 is spaced from the rear inclined surface 31a of the reduced diameter portion 31, due to the pressure difference between the inside and outside of the ink containing portion 21, the ink in the ink bottle passes through the nib support portion 13 and The reduced diameter portion 31 flows into the ink storage portion 21 .

By repeating this, the ink is sucked into the ink storage portion 21 . Furthermore, when the operation member 60 is pushed forward in the state where ink is contained in the ink containing portion 21, a small amount of ink is released from the ink. The accommodating portion 21 flows out through the reduced-diameter portion 31, but after the constricted-diameter portion 31 is blocked by the fixing block member 80, the ink will not flow out from the ink accommodating portion 21, and the air existing in the upper part of the ink accommodating portion 21 out through the pipe 70 . After the suction of the ink into the ink suction device 20 is completed, the writing tool 10 becomes ready for writing by installing the shaft barrel 11 on the nib support portion 13 .

FIG. 4 shows a state in which the ink sucker 20 is arranged with the pen tip 12 facing upward. In this state, by the action of gravity, the tube 70 moves to the rear and the rear end portion 74 abuts against the lowermost portion (rearmost portion) of the coupling concave portion 62 of the operation member 60 . The fixed block member 80 is largely retreated from the diameter-reduced portion 31 , and the diameter-reduced portion 31 is in a communicating (non-blocking) state. The movable block member 90 is located at the lowermost portion (rearmost portion) of the ink storage portion 21 and is in contact with the piston member 50 . In this embodiment, the outer diameter D _90B of the movable block member 90 is smaller than the inner diameter D _53A of the concave portion 53 of the piston member 50 . Therefore, the movable block member 90 enters the recessed portion 53 and abuts against the lowest portion (rearmost portion) of the recessed portion 53 .

Writing with the writing tool 10 is usually performed by pointing the pen tip 12 downward and tilting the long side direction of the writing tool 10 to the vertical direction (the direction in which gravity acts). At this time, the central axis A of the ink sucker 20 is also inclined to the vertical direction. FIG. 5 shows a sectional view of the ink sucker 20 in a state where the central axis A is inclined to the vertical direction. During the conversion of the ink sucker 20 from the state shown in FIG. 4 to the state shown in FIG. 5 , the fixed block member 80 moves forward due to the force of gravity, whereby the ink in the ink containing portion 21 shrinks toward the front. The diameter portion 31 is pushed out.

Especially when the ink in the ink container 21 decreases, even if the ink sucker 20 is switched from the state shown in FIG. 4 to the state shown in FIG. 5, the ink will remain in the ink container due to the effect of surface tension The rear portion of the set portion 21 does not move forward. In the present embodiment, since the ink sucker 20 has the movable block member 90, the ink remaining at the rear of the ink container 21 moves toward the front as the movable block member 90 moves from the rearmost portion of the ink container 21 to the front. The front is pushed out. In particular, if the outer diameter _D90B of the movable block member 90 is smaller than the inner diameter _D53A of the concave portion 53 of the piston member 50, as the movable block member 90 moves forward, the ink staying in the concave portion 53 will also move toward the front. The front is pushed out.

In the writing state shown in FIG. 5, since the central axis A of the ink sucker 20 is inclined to the vertical direction, the fixing block member 80 contacts the inner surface 30a of the main cylinder 30 by gravity. When writing, ink is continuously supplied from the ink storage portion 21 to the nib 12 through the reduced diameter portion 31 and the ink flow hole 14 . As the ink in the ink storage portion 21 decreases, the pressure in the ink storage portion 21 becomes a negative pressure. Therefore, due to the pressure difference between the inside of the ink storage portion 21 and the outside, external air flows into the ink storage portion 21 through the air circulation hole 15 and the reduced-diameter portion 31 . At this time, the ink moves relatively downward and forward, and the air moves backward above the ink.

At this time, in the conventional push-type ink inhaler, the air may not flow into the ink storage part properly, hindering the smooth flow of ink from the ink storage part. When the inventors of this case examined this problem, they realized that the movable block member would hinder the inflow of air into the ink containing portion.

In this embodiment, the inner diameter D _90A of the movable block member 90 is 1.5 times or more and 3.5 times or less the outer diameter D _70B of the pipe 70 . Since the inner diameter D _90A is more than 1.5 times the outer diameter D _70B , the movable block member 90 can largely move downward relative to the fixed block member 80 . That is, the central axis of the movable block member 90 can move downward substantially relative to the central axis of the pipe 70 . Thereby, the ink moving relatively downward can be pushed forward by the movable block member 90 . Also, the size of the gap G1 between the upper portion of the movable block member 90 and the upper portion of the inner surface 30a of the main cylinder 30 becomes large. Thereby, the flow of the air flowing into the ink containing portion 21 through the reduced diameter portion 31 can be effectively suppressed from being obstructed by the movable block member 90 . Also, since the inner diameter D _90A is 3.5 times or less than the outer diameter D _70B , the outer diameter D _90B of the movable block member 90 can be prevented from being too large, thereby effectively suppressing the passage of ink into the ink container 21 through the reduced diameter portion 31. The flow of the inflowing air is hindered by the movable block member 90 .

Especially in this embodiment, the thickness _T90 in the radial direction of the movable block member 90 is the same as the thickness _T80 in the radial direction in the rear end portion 84 of the fixed block member 80, or is smaller than that in the rear end portion 84 of the fixed block member 80. The thickness T ₈₀ in the radial direction is small. In this case, in the writing state shown in FIG. 5 , the size of the gap G1 is larger than the gap between the upper portion of the fixed block member 80 and the upper portion of the inner surface 30 a of the main cylinder 30 . Therefore, the flow of the air flowing into the ink storage portion 21 through the reduced diameter portion 31 is blocked by the movable block member 90 . Furthermore, the thickness _T80 and the thickness _T90 are fixed in the fixed block member 80 and the movable block member 90, and the thickness _T80 and the thickness _T90 are defined as the outer diameter and the outer diameter of the fixed block member 80 and the movable block member 90 respectively. 1/2 of the difference in inner diameter.

In particular, in this embodiment, when the central axis A is arranged parallel to the horizontal direction in the state where the fixed block member 80 and the movable block member 90 are located at the front, the upper end edge 94 of the front end portion 92 of the movable block member 90 is more fixed than the upper end edge 94 of the front end portion 92 . The upper edge 86 of the rear end 84 of the block member 80 is also lower. In this case also in the writing state shown in FIG. 5 , the size of the gap G1 will be larger than the gap between the top of the fixed block member 80 and the top of the inner surface 30 a of the main cylinder 30 . Therefore, it is possible to more effectively suppress the flow of the air flowing into the ink containing portion 21 through the reduced diameter portion 31 from being obstructed by the movable block member 90 .

Another problem is that in the conventional push-type ink suction device, the ink may not flow smoothly from the ink storage portion to the nib. According to the review of the inventors of this case, the following reasons are obtained: when the ink advances and advances toward the nib through the narrowing portion, the ink will stay behind the narrowing portion, hindering the outflow of the ink.

FIG. 6 shows a section corresponding to line VI-VI of FIG. 5 . In the present embodiment, the main cylinder 30 has a rear rib 33 extending in a plane including the central axis A on the inner surface 30 a of the ink container 21 . In particular, the main cylinder 30 has a plurality of rear ribs 33 arranged in the circumferential direction. More specifically, the plurality of rear ribs 33 are arranged at equal angular pitches (equal angular intervals) along the circumferential direction. The rear rib 33 is provided outside the movable range of the piston member 50 in the ink container 21 . In addition, the rear rib 33 is provided in the rear inclined surface 31 a of the reduced diameter portion 31 , outside the range where the closing surface 82 of the fixing block member 80 abuts. Each rear rib 33 extends linearly along the axial direction when viewed from the central axis A. As shown in FIG. Furthermore, without being limited thereto, each rear rib 33 may extend linearly in a direction inclined to the axial direction when viewed from the central axis A, or may extend curvedly when viewed from the central axis A.

Since the main barrel 30 has such a rear rib 33 , the ink in the ink storage portion 21 is guided along the rear rib 33 to the narrowed diameter portion 31 in the writing state. Again, in the note state shown in Figure 5, the solid The lower portion of the fixed block member 80 abuts against the rear rib 33 , and a gap G2 is formed between the lower portion of the fixed block member 80 and the lower portion of the inner surface 30 a of the main cylinder 30 . Therefore, the ink in the ink storage portion 21 can smoothly flow to the diameter-reduced portion 31 through the gap G2. Thereby, it is possible to effectively suppress ink stagnation behind the diameter-reduced portion 31 .

Moreover, in the conventional push-type ink inhaler, the fixed block member 80 is attached to the inner surface 30a of the main cylinder 30, which hinders the movement of the fixed block member 80 to the diameter-reduced portion 31 . In this embodiment, since the main cylinder 30 has such a rear rib 33 and forms the gap G2 between the lower portion of the fixed block member 80 and the lower portion of the inner surface 30a of the main cylinder 30, the fixed block member 80 can also be suppressed. Attached to the inner surface 30a of the main cylinder 30 .

Furthermore, in the conventional push-type ink inhaler, the fixed block member 80 is embedded in the rear inclined surface 31a of the reduced diameter portion 31, and the boundary portion with the rear parallel portion 30a1, so sometimes it also hinders the fixing. The movement of the block member 80 to the reduced-diameter portion 31 , the aforementioned rear parallel portion 30 a 1 is a portion parallel to the central axis A among the inner surface 30 a of the main cylinder 30 . In the present embodiment, since the main cylinder 30 has the rear rib 33 in this way, the fixing block member 80 can also prevent the fixing block member 80 from fitting into the boundary portion between the rear inclined surface 31a and the rear parallel portion 30a1 of the reduced diameter portion 31, and the The fixed block member 80 is stably guided toward the reduced-diameter portion 31 .

In particular, in this embodiment, at least a part of the rear rib 33 is provided on the rear inclined surface 31 a of the reduced diameter portion 31 . In this case, the ink in the ink storage portion 21 is more effectively guided to the narrowed diameter portion 31 along the rear rib portion 33 .

In particular, in the present embodiment, in the rear parallel portion 30a1, the rear rib 33 includes a portion whose distance from the central axis A along the radial direction becomes smaller as it goes forward. In this case, in this part, the fixed block member 80 is induced to come closer to the central axis A as it advances forward. Therefore, the fixed block member 80 can be more stably guided toward the narrowed diameter portion 31 .

In the conventional push-type ink suction device, the air does not flow into the ink container properly Sometimes it will hinder the smooth flow of ink from the ink storage part. When the inventors of this project conducted a review on this subject, they obtained the following insights: because the air in the ink storage part stays in front of the constricted diameter part, it prevents the air from flowing into the ink. inflow into the housing.

FIG. 7A shows an example of a cross section corresponding to line VII-VII in FIG. 5 , and FIG. 7B shows another example of a cross section corresponding to line VII-VII in FIG. 5 . In particular, FIGS. 7A and 7B show the ink sucker 20 in a section perpendicular to the central axis A. As shown in FIG. In this embodiment, the inner surface 30a of the main cylinder 30 in front of the reduced diameter portion 31 has a front inclined surface 31b inclined to the axial direction and the radial direction, or has a front surface extending in a plane including the central axis A of the main cylinder. The front rib 34.

In the example shown in FIG. 7A , the main cylinder 30 has a front rib 34 . In particular, in the illustrated example, the main cylinder 30 has a plurality of front ribs 34 arranged in the circumferential direction. More specifically, the plurality of front ribs 34 are arranged at equal angular pitches (equal angular intervals) along the circumferential direction. Each front rib 34 extends linearly along the axial direction when viewed from the central axis A. As shown in FIG. Furthermore, without being limited thereto, each front rib 34 may extend linearly in a direction inclined to the axial direction when viewed from the central axis A, or may extend curvedly when viewed from the central axis A.

Since the main cylinder 30 has such a front rib 34 , air (air bubbles) advancing toward the ink storage portion 21 is induced along the front rib 34 to the narrowed diameter portion 31 in the writing state. This suppresses the air that has advanced into the ink storage portion 21 from stagnating in front of the reduced-diameter portion 31 , and promotes the inflow of the air into the ink storage portion 21 . In addition, the ink flowing out from the ink storage portion 21 is guided toward the nib support portion 13 along the front rib portion 34 . This also facilitates the outflow of ink from the ink storage portion 21 .

The inventors presume the principle of producing such effects as follows. When the main cylinder 30 has such a front rib 34 , when writing with the nib 12 facing downward and the longitudinal direction of the writing instrument 10 inclined to the vertical direction, the distance between the front portion of the tube 70 and the inner surface 30 a of the main cylinder 30 The distance between will become smaller. Here, the tensile force P of the ink due to the surface tension T of the ink sets the distance between the tube 70 and the inner surface 30a as r, and sets the contact angle between the ink and the inner surface 30a as θ, expressed as: P=(2×T×cosθ)/r. Therefore, as the distance r between the tube 70 and the inner surface 30a becomes smaller, it can be presumed that the stretching force P of the ink increases.

In particular, in the illustrated example, the front rib 34 has a corner portion 35 facing the central axis A in a cross section perpendicular to the central axis A. As shown in FIG. Since the front rib 34 has such corners 35 , the air bubbles are attached to the inner surface 30 a of the main tube 30 and the air bubbles in the narrowed diameter part 31 are restrained by the action of the surface tension acting on the air bubbles in contact with the corners 35 . Stay ahead.

In particular, in the illustrated example, in the front parallel portion 30a2 parallel to the central axis A of the inner surface 30a, the front rib 34 includes a portion whose distance from the central axis A along the radial direction changes as it goes backward. small portions. In this case, in front of the reduced-diameter portion 31 , air advancing toward the ink storage portion 21 is induced to approach the central axis A along the front rib 34 as it advances rearward. Therefore, it is possible to more effectively suppress the stagnation of the air in front of the reduced-diameter portion 31 .

In the example shown in FIG. 7B, the main cylinder 30 has the front inclined surface 31b. It is a surface which extends obliquely with respect to an axial direction and a radial direction toward the outer side of a radial direction as it goes forward. The main cylinder 30 has the front inclined surface 31b so that the air (air bubbles) advancing toward the ink storage portion 21 is induced to the narrowed diameter portion 31 along the front inclined surface 31b in the writing state. This prevents the air that has advanced into the ink storage portion 21 from stagnating in front of the reduced-diameter portion 31 , and facilitates the inflow of the air into the ink storage portion 21 . In addition, the ink flowing out from the ink storage portion 21 is guided toward the nib support portion 13 along the front inclined surface 31b. This also facilitates the outflow of ink from the ink storage portion 21 .

In particular, in the illustrated example, the front inclined surface 31 b has a groove portion 32 extending in a plane including the central axis A of the main cylinder 30 . In particular, in the illustrated example, the front inclined surface 31b has a plurality of grooves 32 arranged in the circumferential direction. More specifically, the plurality of grooves 32 are arranged at equal angular pitches (equal angular intervals) along the circumferential direction. Each groove portion 32 extends linearly along the axial direction when viewed from the central axis A. As shown in FIG. Furthermore, it is not limited to this, and each groove portion 32 may also be formed in a direction inclined to the axial direction when viewed from the central axis A. It may extend linearly, or may extend curvedly when viewed from the central axis A.

Since the front inclined surface 31 b has such a groove portion 32 , the air (bubbles) advancing toward the ink storage portion 21 is guided along the groove portion 32 to the diameter-reduced portion 31 . Thereby, it is possible to further suppress the air that advances into the ink storage portion 21 from stagnating in front of the reduced-diameter portion 31 , and to further promote the inflow of the air into the ink storage portion 21 . In addition, the ink flowing out from the ink storage portion 21 is guided toward the nib support portion 13 along the groove portion 32 . Thereby, the outflow of ink from the ink storage portion 21 can be further promoted.

In particular, in the illustrated example, the circumferential width of the groove portion 32 becomes smaller toward the front. As a result, the capillary force in the groove portion 32 increases toward the front. Therefore, the ink flowing out of the ink storage portion 21 is sucked forward along the groove portion 32 . Thereby, the ink can be further promoted to flow out from the ink containing portion 21 .

In addition, various changes can be added to the above-mentioned embodiment. Hereinafter, modifications will be described with reference to the drawings as appropriate. In the following description and the drawings used in the following description, the same symbols as those used for the corresponding parts in the above-mentioned embodiment are used for the parts having the same configuration as the above-mentioned embodiment, and omit repeated descriptions.

FIG. 8 is a longitudinal sectional view showing a modified example of the ink sucker 20, and FIG. 9 is a cross-sectional view corresponding to line IX-IX of FIG. 8 .

In this modified example, the main cylinder 30 of the ink sucker 20 has a plurality of front ribs 34 . In particular, in the example shown in FIG. 9 , the main cylinder 30 has four front ribs 34 arranged at equal angular intervals along the circumferential direction. That is, in the illustrated example, two front ribs 34 adjacent in the circumferential direction are arranged with an angular pitch of 90 degrees from each other.

In the example shown in FIG. 9 , the respective front ribs 34 are arranged at intervals S1 from each other along the circumferential direction. Here, the interval S1 refers to the length along the circumferential direction on the inner surface 30 a of the main cylinder 30 . In this modified example, the interval S1 is 2.7 mm or more. That is, the interval S1 between two adjacent front ribs 34 in the circumferential direction is 2.7 mm or more.

When the interval S1 is 2.7 mm or more, a sufficient interval is ensured between the two adjacent front ribs 34 , so that air bubbles are suppressed from clogging between the two front ribs 34 . That is, in the front part of the narrowed diameter part 31, stagnation of air bubbles is suppressed, and the flow of air bubbles is accelerated|stimulated. Thereby, the outflow of the ink from the ink storage portion 21 can be promoted as the air bubbles move backward.

The distance S1 between two adjacent front ribs 34 in the circumferential direction is preferably not less than 2.7 mm and not more than 4.7 mm. When the distance S1 is 4.7 mm or less, the distance between the front portion of the tube 70 and the inner surface 30a of the main cylinder 30 can be appropriately reduced when the longitudinal direction of the writing instrument 10 is inclined to the vertical direction. Therefore, the stretching force P of the ink caused by the surface tension T of the ink can be effectively increased. Also, the interval S1 is more preferably not less than 3.3 mm and not more than 3.7 mm.

Fig. 10 is a cross-sectional view corresponding to line X-X of Fig. 8 . In this modified example, the main cylinder 30 of the ink sucker 20 has a plurality of rear ribs 33 . In particular, in the example shown in FIG. 10 , the main cylinder 30 has five rear ribs 33 arranged at equal angular intervals along the circumferential direction. That is, in the illustrated example, two rear ribs 33 adjacent to each other in the circumferential direction are arranged with an angular pitch of 72 degrees.

In the example shown in FIG. 10 , the respective rear ribs 33 are arranged at intervals S2 from each other along the circumferential direction. Here, the interval S2 refers to the length along the circumferential direction on the inner surface 30 a of the main cylinder 30 . In this modified example, the space S2 is 2.7 mm or more. That is, the interval S2 between two adjacent rear ribs 33 in the circumferential direction is 2.7 mm or more.

If the interval S2 is 2.7 mm or more, a sufficient interval can be ensured between two adjacent rear ribs 33 , so that air bubbles can be suppressed from clogging between the two rear ribs 33 . That is, in the rear portion of the reduced-diameter portion 31 , stagnation of air bubbles is suppressed, and the flow of air bubbles is promoted. Thereby, the outflow of the ink from the ink storage portion 21 can be promoted as the air bubbles move backward.

The distance S2 between two adjacent rear ribs 33 in the circumferential direction is preferably not less than 2.7 mm and not more than 4.7 mm. When the distance S2 is 4.7 mm or less, the distance between the rear part of the pipe member 70 and the inner surface 30 a of the main cylinder 30 can be appropriately reduced when the longitudinal direction of the writing instrument 10 is inclined to the vertical direction. therefore, The stretching force P of the ink due to the surface tension T of the ink can be effectively increased. Also, the interval S2 is more preferably not less than 3.3 mm and not more than 3.7 mm.

13: Nib support

14: Ink circulation hole

15: Air circulation hole

16: Installation Department

20: Ink Inhaler

21: Ink storage part

25: Endow potential energy components

30: main barrel

30a: inner surface

30a1: rear parallel part

30a2: front parallel part

30b: Outer surface

31: Reduced diameter part

31a: rear inclined surface

31b: front inclined surface

33: Rear rib

34: front rib

36: uneven part

40: tailpiece

42: Rear opening

44: Flange

50:Piston component

51: Convex flange

51a: front face

53: Concave

55: Connect convex part

57: hole

59: Through hole

60: Operating components

62: Connection recess

64: Convex

70: pipe fittings

72: front end

74: Rear end

76: Expanding part

80: Fixed block components

82: Occlusion surface

84: Rear end

90: Movable block components

92: front end

A: Central axis

D _53A : Inner diameter of recess

D _70B : Outer diameter of pipe fittings

D _90A : Inner diameter of the movable block member

D _90B : Outer diameter of movable block member

T ₈₀ : Thickness in the radial direction of the rear end of the fixed block member

T ₉₀ : Thickness in the radial direction of the movable block member

Claims (5)

An ink inhaler, comprising: a main cylinder having a diameter-reducing portion on the inner surface, and defining an ink accommodating portion behind the diameter-reducing portion; a piston member configured to move back and forth relative to the main cylinder; The diameter-reducing portion extends inside the main cylinder and is held to be movable back and forth relative to the piston member; and a fixed block member is fixed to the pipe fitting behind the diameter-reducing portion, and the main cylinder is in front of the diameter-reducing portion. The inner surface of the inner surface has a front inclined surface inclined to the axial direction and the radial direction. The front inclined surface has a groove extending in a plane including the central axis of the main cylinder, and the width of the circumferential direction of the groove decreases as it goes forward. . The ink inhaler according to claim 1, wherein said main cylinder has a plurality of said grooves arranged in the circumferential direction. The ink inhaler according to claim 1, wherein the main cylinder has a rear rib extending in a plane including the central axis of the main cylinder on the inner surface of the ink containing portion. The ink inhaler according to claim 3, wherein said main cylinder has a plurality of said rear ribs arranged in the circumferential direction. The ink inhaler according to claim 4, wherein the distance between two adjacent rear ribs in the circumferential direction is 2.7 mm or more.

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