JP7713382B2 - Ink aspirator - Google Patents

Description

The present invention relates to an ink inhaler for use in writing instruments such as fountain pens.

Traditionally, writing instruments such as fountain pens use ink aspirators that draw ink into the pen and store it therein, then supply the ink to the pen tip when writing. The ink aspirator has an ink storage section and an ink suction mechanism for drawing ink into the ink storage section.

The ink suction mechanism usually has a mechanism for generating negative pressure in the ink suction device and sucking ink by utilizing the air pressure difference between the inside and outside of the ink suction device. Examples of methods for generating negative pressure in the ink suction device include a slide type in which the operating member is operated linearly backward to move the piston member connected to the front of the operating member backward to generate negative pressure in the ink suction device, a rotation type in which the operating member is rotated around its axis to move the piston member screwed with the operating member backward to generate negative pressure in the ink suction device, and a push type in which the piston member provided at the rear of the ink suction device is pressed forward and then released to generate negative pressure in the ink suction device. In particular, in the push type ink suction device described in Patent Document 1 (Japanese Utility Model Application Publication No. 63-182181), the length of the operating member can be made smaller than that of the slide type or rotation type ink suction device. This makes it possible to make the ink suction device of the same capacity smaller, or to increase the capacity of an ink suction device of the same dimensions.

Japanese Utility Model Application Publication No. 63-182181

In a fountain pen with the ink suction mechanism, the barrel is usually formed by screwing the body onto the neck, and when suctioning ink, the body is unscrewed from the neck to expose the ink suction device connected to the pen core, and ink is sucked from the pen core inserted into the ink in the ink bottle. After suctioning ink, the exposed ink suction device is inserted into the body, and the neck and body are screwed together.
In addition, conventional push-type ink absorbers have an operating member that protrudes backward to push the piston member forward, and when inserting the ink absorber into the barrel, it is necessary to ensure that the operating member does not come into contact with any part of the barrel. If the operating member touches any part of the barrel and causes the ink absorber to malfunction, ink will leak from the pen core.
When screwing the body onto the neck, the neck is held with the fingers, which means that the hands are soiled with leaked ink and the desk is also soiled with the leaked ink.

The present invention was made with these points in mind, and aims to provide a push-type ink inhaler that will not malfunction if the operating member touches a part of the barrel when inserting the ink inhaler into the barrel after ink intake is complete.

The ink inhaler according to the present invention comprises:
"1. A main cylinder having a tapered portion on its inner surface and defining an ink reservoir behind the tapered portion;
A piston member arranged so as to be movable back and forth relative to the main cylinder;
an operating member connected to the piston member;
a pipe that passes through the reduced diameter portion, extends inside the main cylinder, and is held so as to be movable back and forth relative to the piston member,
the operating member has a pressing member connected to the piston member and a rotating member that rotates relative to the main cylinder,
the rotating member has an abutment portion that abuts against the main cylinder,
the main cylinder has an insertion portion through which the abutment portion is inserted,
The ink suction device in which the operating member can be pressed forward by rotating the rotating member so that the positions of the abutment portion and the insertion portion coincide with each other.
2. The ink suction device according to claim 1, wherein the abutment portion of the rotating member is a protrusion protruding outward, and the insertion portion of the main cylinder is a groove.
3. The pressing member has a convex portion on its outer surface, and the rotating member has a concave portion on its inner surface in which the convex portion of the pressing member rotates,
An ink suction device as described in claim 1 or 2, wherein the inner surface of the recess has a first step which the convex portion overcomes when the positions of the abutment portion and the insertion portion are aligned, and a second step which the convex portion overcomes when the positions of the abutment portion and the insertion portion are misaligned.
4. The ink suction device according to any one of claims 1 to 3, wherein the rotating member has an outwardly bulging flange at its rear end.
5. The ink suction device according to the above item 4, wherein the flange portion is made of a friction material.

According to the present invention, it is possible to obtain a push-type ink inhaler that does not malfunction even if the operating member touches a part of the barrel when inserting the ink inhaler into the barrel.

FIG. 1 is a diagram for explaining an embodiment of the present invention, showing a cross section of a writing implement incorporating an ink suction device. 2A is a vertical cross-sectional view, FIG. 2B is a cross-sectional view taken along line BB in FIG. 2A, and FIG. 2C is a cross-sectional view taken along line CC in FIG. 2A. 3A is a cross-sectional view showing an enlarged state in which the rotating member of the ink suction device is rotated, FIG. 3A being a longitudinal cross-sectional view, FIG. 3B being a cross-sectional view taken along line B-B of FIG. 3A, and FIG. 3C being a cross-sectional view taken along line CC of FIG. 3A. FIG. 4 is a cross-sectional view showing the ink suction device with its operating member pushed forward.

One embodiment of the present invention will now be described with reference to the drawings. Note that in the drawings attached to this specification, the scale and aspect ratios have been appropriately altered and exaggerated from those of the actual objects for the sake of ease of illustration and understanding.

In addition, terms used in this specification that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "same," as well as values of length and angle, are not to be bound by strict meanings, but are to be interpreted to include the range within which similar functions can be expected.

1 to 4 are diagrams for explaining an embodiment of the present invention. Of these, FIG. 1 is a cross-sectional view of a writing instrument 10 incorporating an ink inhaler 20, FIG. 2 is an enlarged cross-sectional view of the ink inhaler 20, FIG. 3 is an enlarged cross-sectional view of the ink inhaler 20 with the rotating member 61 rotated, and FIG. 4 is a cross-sectional view of the ink inhaler 20 with its operating member 60 pushed forward. In this embodiment, an example is described in which the writing instrument 10 is a fountain pen, but the writing instrument 10 is not limited to a fountain pen. In this specification, the direction in which the central axis A of the main tube 30 of the ink inhaler 20 extends (longitudinal direction) is defined as the axial direction, the direction perpendicular to the central axis A is defined as the radial direction, and the circumferential direction around the central axis A is defined as the circumferential direction. Additionally, in the writing instrument 10 and the ink injector 20, the side that is closest to the surface being written on, such as the paper surface, when writing along the axial direction (e.g., the lower side in FIG. 1) is the front, and the side that is farther away from the surface being written on (e.g., the upper side in FIG. 1) is the rear.

The writing instrument 10 shown in FIG. 1 includes a barrel 11, a nib 12, and a nib support 13 located in front of the barrel 11 and supporting the nib 12. The barrel 11 is a member having a longitudinal direction along the central axis A, and is composed of a neck 11a and a body 11b that are screwed together, and has a cavity that opens toward the front inside. In this embodiment, at least a part of the ink aspirator 20 is housed in the cavity of the barrel 11. The nib 12 is a member that forms handwriting on a writing surface with ink supplied from the ink aspirator 20. The nib support 13 has an ink flow hole 14 and an air flow hole 15 inside. The ink flow hole 14 is connected to the nib 12 and functions as a passage that guides the ink supplied from the ink aspirator 20 toward the nib 12. The air flow hole 15 extends generally along the axial direction and opens near the nib 12. The air flow hole 15 functions as a passage that guides the outside air that flows in from the opening toward the ink aspirator 20. The pen tip support 13 is formed with an attachment section 16 to which the ink aspirator 20 is attached. In this embodiment, the attachment section 16 is configured as a protrusion facing backward, and the ink aspirator 20 is detachably attached to the pen tip support 13 by fitting the front end of the ink aspirator 20 to the attachment section 16. However, this is not limited to this, and the attachment section 16 may be configured as a groove that opens to the rear, and the ink aspirator 20 may be attached to the pen tip support 13 by pressing the front end of the ink aspirator 20 into the attachment section 16. A male thread is formed in the neck 11a to which the pen tip support 13 is fitted, and a corresponding female thread is formed on the front inner surface of the body 11b. The female thread of the body 11b is screwed into the male thread of the neck 11a to form the shaft tube 11.

The ink inhaler 20 of this embodiment is a push-type ink inhaler, and has an ink storage section 21 therein that stores ink to be supplied to the pen tip 12. The ink inhaler 20 includes a main cylinder 30 that defines the ink storage section 21, a piston member 50 arranged so as to be movable back and forth relative to the main cylinder 30, a pipe 70 held so as to be movable back and forth relative to the piston member 50, and a fixed piece member 80 fixed to the pipe 70. In the illustrated example, the ink inhaler 20 further includes the main cylinder 30, an operating member 60 attached to the rear of the piston member 50, and a movable piece member 90 loosely fitted in the pipe 70 behind the fixed piece member 80. Each of the components that make up the ink inhaler 20 of this embodiment will be described below 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 in which the inner diameter is reduced. The reduced diameter portion 31 is a protrusion formed in an annular shape along the circumferential direction on the inner surface 30a. In particular, the reduced diameter portion 31 is a protrusion in which the inner surface 30a protrudes toward the central axis A. The ink storage section 21 is formed behind the reduced diameter portion 31. Behind the apex of the reduced diameter portion 31 closest to the central axis A, a rearward inclined surface 31a is formed that faces the ink storage section 21 and is inclined in the axial and radial directions, and ahead of the apex, a forward inclined surface 31b is formed that is inclined in the axial and radial directions. The rearward inclined surface 31a is a surface that extends radially outward as it approaches the rear, and the forward inclined surface 31b is a surface that extends radially outward as it approaches the front.

The main cylinder 30 includes a transition piece member 40 attached to the rear. The transition piece member 40 houses at least a portion of the operating member 60. An inwardly protruding flange 44 is formed at the rear end opening 42 of the transition piece member 40, and the flange 44 abuts against a protrusion 63 (described below) of the operating member 60 when the operating member 60 is in an open state. The flange 44 may be a single protrusion provided around the entire circumference in the circumferential direction, or may be a plurality of protrusions arranged in a discrete manner in the circumferential direction.

The piston member 50 has a flange portion 51 and a connecting protrusion 55 provided behind the flange portion 51. The flange portion 51 is located inside the main cylinder 30, and the radially outermost end of the flange portion 51 is in liquid-tight contact with the inner surface 30a of the main cylinder 30. As a result, the ink storage section 21 is defined as a space surrounded by the inner surface 30a of the main cylinder 30 and the reduced diameter portion 31, and the flange portion 51 of the piston member 50. The flange portion 51 has a recess 53 recessed rearward from the front end surface 51a. The connecting protrusion 55 functions as a connecting portion that connects the piston member 50 to the operating member 60. The connecting protrusion 55 has a hole 57 that opens rearward. The piston member 50 has a partition wall 58 that closes the front of the hole 57, and a through hole 59 on the central axis A that connects the recess 53 and the hole 57. A pipe 70 is loosely inserted into the through hole 59. That is, the inner diameter of the through hole 59 is larger than the outer diameter of the body of the pipe 70, which allows the pipe 70 to move back and forth relative to the piston member 50. The hole 57 serves as an introduction point when the pipe 70 is inserted into the through hole 59, and defines the movable range when the pipe 70 moves back and forth relative to the piston member 50.

In addition, the partition 58 has a plurality of grooves 59a communicating with the through hole 59 in order to ensure smooth flow of ink and air between the ink storage section 21 and the hole 57, and one of the grooves 59a is provided in the surface direction of the pen tip 12 shown in FIG. 1. Four of the grooves 59a are arranged radially with respect to the through hole 59, and extend in the axial direction to communicate the recess 53 and the hole 57 in the same way as the through hole 59. As a result, when writing with the surface of the pen tip 12 facing upward, the air in the ink storage section 21 is more likely to enter the hole 57 of the piston member 50 via the groove 59a, and the ink in the hole 57 of the piston member 50 is more likely to flow into the ink storage section 21. In addition, an expanded diameter section 76 is formed at the rear end 74 of the pipe 70 by expanding the main body of the pipe 70 in the radial direction. The outer diameter of the expanded diameter section 76 is larger than the inner diameter of the through hole 59 of the piston member 50, but smaller than the maximum width of the groove 59a. Therefore, even when the pipe 70 advances and the enlarged diameter portion 76 abuts against the partition wall 58, the groove 59a ensures smooth flow of ink and air.

The operating member 60 is a member whose forward and backward movement is restricted with respect to the piston member 50, and is operated by the user when moving the piston member 50 forward and backward with respect to the main cylinder 30. The operating member 60 has a connecting recess 62 that opens on the front end surface and engages with the connecting protrusion 55 of the piston member 50. In the illustrated example, an engagement recess is provided on the side of the connecting recess 62, and an engagement protrusion corresponding to the engagement recess of the connecting recess 62 is provided on the side of the connecting protrusion 55. The connecting protrusion 55 is inserted into the connecting recess 62, and the engagement protrusion of the connecting protrusion 55 and the engagement recess of the connecting recess 62 engage with each other, thereby connecting the piston member 50 to the operating member 60. The connecting protrusion 55 of the piston member 50 is attached to the connecting recess 62 in a liquid-tight manner so that the ink that flows into the hole 57 does not leak to the outside. A convex portion 63 that protrudes radially outward is provided on the outer circumferential surface of the operating member 60. A biasing member 25 is disposed between the main cylinder 30 and the convex portion 63. In the illustrated example, the biasing 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 63 in an axially compressed state. This biases the operating member 60 rearward relative to the main cylinder 30. When the operating member 60 is in an open state (not pressed forward by the user), the protrusion 63 abuts against the flange 44 of the transition member 40 from the front. Therefore, the rear end of the movable range of the operating member 60 is defined by the flange 44.

The pipe 70 is arranged to extend through the reduced diameter section 31 inside the main tube 30. In both the open state (see FIG. 2) and the pressed state (when pressed forward by the user, see FIG. 4) of the operating member 60, the front end 72 of the pipe 70 is located in front of the reduced diameter section 31. Since the outer diameter of the portion of the pipe 70 other than the enlarged diameter section 76 shown in the figure is smaller than the inner diameter of the through hole 59, the pipe 70 can move in the front-rear direction when inserted into the through hole 59, and is located at the frontmost position relative to the piston member 50 when the enlarged diameter section 76 is engaged with the partition wall 58 from the rear. The pipe 70 is hollow inside, and the portion of the main tube 30 in front of the reduced diameter section 31 communicates with the hole 57 of the piston member 50 via the pipe 70.

The material for forming the pipe 70 is not particularly limited, but as an example, a metal material such as stainless steel can be used. The material for forming the piston member 50 is not particularly limited, but as an example, a resin material such as polyethylene resin, polypropylene resin, polyacetal resin, etc. can be used. The pipe 70 made of stainless steel is ink resistant and has better ink wettability than the resin materials such as polyethylene resin, polypropylene resin, and polyacetal resin that form the piston member 50. When the air in the ink storage section 21 enters the hole 57 of the piston member 50, the ink in the hole 57 of the piston member 50 flows out through the pipe 70 to the vicinity of the ink flow hole 14, making it possible to write with the pen tip 12. 2, by setting the axial distance from the rear end surface of the partition 58 of the piston member 50 to the rear end surface of the pipe 70 to 0.5 mm or less when the pipe 70 has been advanced and the enlarged diameter portion 76 is in contact with the partition 58, the ink in the hole 57 of the piston member 50 can easily flow into the pipe 70, and the ink in the hole 57 of the piston member 50 can be made to flow smoothly into the ink storage section 21. When the central axis A of the ink inhaler 20 is tilted relative to the vertical direction during writing, the pipe member 70 tilts relative to the central axis A with the partition 58 of the piston member 50 as a fulcrum, and the axial distance from the rear end surface of the partition 58 of the piston member 50 to the rear end surface of the pipe 70 changes, but the maximum distance is set to 0.5 mm or less. In addition, if the pipe 70 has better ink wettability than the piston member 50, the ink in the hole 57 of the piston member 50 will flow through the pipe 70 and into the ink storage section 21, and the ink will also flow through the through hole 59 and groove 59a of the piston member 50, along the outer surface of the pipe 70, which has better wettability, and into the ink storage section 21.

The fixed piece member 80 is fixed to the pipe 70 behind the reduced diameter section 31. More specifically, the fixed piece member 80 is fixed to the outer surface of the pipe 70 behind the reduced diameter section 31. The fixed piece member 80 is made of an elastic material. As an example of this elastic material, fluororubber can be used. The fixed piece member 80 has a blocking surface 82 at the front. In the illustrated example, the blocking surface 82 includes a surface that is inclined in the axial direction and the radial direction so as to move away from the pipe 70 in the radial direction toward the rear. When the pipe 70 and the fixed piece member 80 move forward, the blocking surface 82 abuts against the rear inclined surface 31a of the reduced diameter section 31 to block the reduced diameter section 31.

The movable piece member 90 is loosely fitted into the pipe 70 behind the fixed piece member 80. In other words, the movable piece member 90 can move in the front-rear direction along the pipe 70 behind the fixed piece member 80. The movable piece member 90 is formed into a cylindrical shape overall, and the pipe 70 is inserted inside. There are no particular limitations on the material from which the movable piece member 90 is made, but as an example, a metal material such as stainless steel can be used.

When the ink inhaler 20 described above is in the open state shown in FIG. 2, the operating member 60 is urged rearward by the urging member 25. The protrusion 63 provided on the outer peripheral surface of the operating member 60 abuts from the front against the flange 44 provided on the rear end opening 42 of the tail tube member 40, thereby restricting 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 piece member 80 fixed to the pipe 70, and the movable piece member 90 loosely fitted in the pipe 70 are also positioned rearward.

When sucking ink into the ink storage section 21 of the ink inhaler 20, prepare an ink bottle or the like in which ink is stored, and with the ink inhaler 20 attached to the pen tip support section 13, immerse the pen tip support section 13 in the ink with the pen tip 12 facing downward until the ink flow hole 14 and air flow hole 15 are positioned below the ink surface.

When the operating member 60 is pressed forward (downward) by, for example, the user's finger while facing upward, it enters the pressed state shown in FIG. 4. When transitioning from the open state to the pressed state, the piston member 50, the pipe 70, the fixed piece member 80, and the movable piece member 90 also move forward as the operating member 60 moves forward. During this movement, the blocking surface 82 of the fixed piece member 80 first abuts against the rear inclined surface 31a of the reduced diameter portion 31 to block the reduced diameter portion 31. As a result, the pipe 70, the fixed piece member 80, and the movable piece member 90 stop. When the operating member 60 further moves forward, the piston member 50 moves further forward. At this time, the air compressed in the ink storage section 21 passes through the gap between the through hole 59 of the piston member 50 and the pipe 70, passes through the hole 57 and the cavity in the pipe 70, and flows out from the front end 72 of the pipe 70. The air that flows out of the pipe 70 is discharged to the outside through the pen tip support 13. In addition, since the through hole 59 of the piston member 50 has a plurality of grooves 59a that communicate with the through hole 59, sufficient air circulation between the ink storage section 21 and the hole 57 is ensured, and the movement of air from inside the ink storage section 21 to inside the hole 57 can be performed quickly and stably, and the smooth flow of ink from inside the hole 57 of the piston member 50 to inside the ink storage section 21 can be ensured.

In this state, for example, when the user releases the finger that has been pressing the operating member 60 forward, the pressing force applied to the operating member 60 is released, and the operating member 60 is suddenly retracted by the biasing force of the biasing member 25. Accordingly, the piston member 50 also suddenly retracts, and the pressure inside the ink storage section 21 becomes negative. When the operating member 60 and the piston member 50 further retract, the enlarged diameter section 76 provided at the rear end 74 of the pipe 70 engages with the through hole 59 of the piston member 50, and the pipe 70, the fixed piece member 80, and the movable piece member 90 retract together with the piston member 50. When the closing surface 82 of the fixed piece member 80 separates from the rear inclined surface 31a of the reduced diameter section 31, the ink in the ink bottle flows into the ink storage section 21 via the pen tip support section 13 and the reduced diameter section 31 due to the pressure difference between the inside of the ink storage section 21 and the outside.

By repeating this, ink is sucked into the ink reservoir 21. If the operating member 60 is pressed forward when there is ink in the ink reservoir 21, a small amount of ink may flow out of the ink reservoir 21 through the narrowed portion 31; however, after the narrowed portion 31 is closed by the fixed piece member 80, no ink flows out of the ink reservoir 21, and the air present at the top of the ink reservoir 21 flows out through the pipe 70. After the ink has been sucked into the ink inhaler 20, the body 11b is attached to the neck 11a, and the writing instrument 10 is ready for writing.

In the ink inhaler 20 of this embodiment, the operating member 60 includes a pressing member 64 connected to the piston member 50, a rotating member 65 that rotates relative to the main cylinder 30, and a friction member 66 fixed to the rotating member 62. The pressing member 64 is an axial member on which the connecting recess 62 and the protrusion 63 are formed, and has a small diameter portion 64a at the rear. The rotating member 65 has an opening 65a at the front, into which the small diameter portion 64a of the pressing member 64 is rotatably inserted. In addition, a contact portion 65b, which is a protrusion extending in the axial direction and protruding outward, is formed on the side of the rotating member 65, and is capable of being inserted into an insertion portion 43 formed by removing a portion of the rear end surface 41 of the transition member 40 to form a groove. The friction member 66 is an annular member made of silicone resin, and a recess 66a formed on the inner surface is fitted with a protrusion 65c formed on the outer surface of the rotating member 65, so that the two work together. Materials for the friction member 66 include natural rubber, butadiene rubber, acrylic rubber, urethane rubber, chloroprene rubber, neoprene rubber, etc., and make it difficult for fingers to slip when in contact with it.

In the state shown in Figure 2, the abutment portion 65b of the rotating member 65 abuts against the rear end face 41 of the transition piece member 40, restricting the forward movement of the operating member 60, and in the state shown in Figure 3, the positions of the abutment portion 65b of the rotating member 65 and the insertion portion 43 of the transition piece member 40 coincide with each other, making it possible to press the operating member 60 forward, as shown in Figure 4.
Therefore, in this embodiment, if the rotating member 65 is left in the position shown in Figure 2 after ink suction is completed, the ink suction device 20 will not malfunction even if the operating member 60 touches a part of the barrel 11b when inserting the ink suction device 20 into the barrel 11b.
In addition, the friction member 66 at the rear end of the rotating member 65 is a flange that bulges outward, so that when the operating member 60 is pressed, the surface that the finger comes into contact with is wide, making it easier to press, and also when rotating the rotating member 65, a rotational torque is applied, making it easier to rotate. Since the friction member 66 bulges outward, naturally, when the ink suction device 20 is inserted into the barrel 11b, the operating member 60 is likely to come into contact with the inner surface of the barrel 11b, but as described above, if the rotating member 65 is kept in the state shown in Figure 2, there will be no malfunction.
Furthermore, the outer surface of the pressing member 64 has a convex portion 64b, the inner surface of the rotating member 65 has a concave portion 65d around which the convex portion 64b of the pressing member 64 rotates, and on the inner surface of the concave portion 65d, a first step portion 65e that the convex portion 64b overcomes when the position of the abutting portion 65b of the rotating member 65 coincides with the position of the insertion portion 43 of the tail tube member 40, and a second step portion 65f that the convex portion 64b overcomes when the position of the abutting portion 65b and the insertion portion 43 are misaligned are formed, so that the rotating state of the rotating member 65 is easily recognized and malfunction is further reduced. When the first step portion 65e and the second step portion 65f are overcome, a sense of resistance is generated in the rotation of the rotating member 65, and after the overcome, a sense of openness is generated in the rotation of the rotating member 65, making it possible for the user to recognize the rotating body of the rotating member. It is advisable to provide a mark on the rear end surface of the rotating member 65 or on the rear end surface or side surface of the friction member 66 so as to indicate the rotational position of the rotating member 65. In the state shown in Figures 2 and 4, the key projection 64c formed on the outer surface of the pressing member 64 is engaged with the insertion portion 43 of the transition piece member 40, so that the rotating member 65 can be reliably rotated relative to the pressing member 64.

10 Writing instrument 11 Barrel 11a Neck 11b Body 12 Pen tip 13 Pen tip support 20 Ink suction device 21 Ink storage 25 Pressing member 30 Main cylinder 30a Inner surface 31 Reduced diameter portion 31a Rear inclined surface 31b Front inclined surface 32 Groove 35 Corner 40 Transom 41 Rear end surface 42 Rear end opening 43 Insertion portion 44 Flange 50 Piston member 51 Flange 51a Front end surface 53 Recess 55 Connecting protrusion 57 Hole 58 Partition 59 Through hole 59a Groove 60 Operating member 62 Connecting recess 63 Protrusion 64 Pressing member 64a Small diameter portion 64b Protrusion 64c Key projection 65 Rotating member 65a Opening 65b Contact portion 65c Protrusion 65d Recess 65e First step 65f Second step portion 66 Friction member 66 a Recess 70 Pipe 72 Front end portion 74 Rear end portion 76 Expanded diameter portion 80 Fixed piece member 82 Closed surface 84 Rear end portion 86 Upper end edge 90 Movable piece member 92 Front end portion 94 Upper end edge

Claims (5)

a main cylinder having a tapered portion on an inner surface thereof and defining an ink reservoir behind the tapered portion;
A piston member arranged so as to be movable back and forth relative to the main cylinder;
an operating member connected to the piston member;
a pipe that passes through the reduced diameter portion, extends inside the main cylinder, and is held so as to be movable back and forth relative to the piston member,
the operating member has a pressing member connected to the piston member and a rotating member that rotates relative to the main cylinder,
the rotating member has an abutment portion that abuts against the main cylinder,
the main cylinder has an insertion portion through which the abutment portion is inserted,
The ink suction device in which the operating member can be pressed forward by rotating the rotating member so that the positions of the abutment portion and the insertion portion coincide with each other. The ink suction device according to claim 1, wherein the contact portion of the rotating member is a protrusion that protrudes outward, and the insertion portion of the main cylinder is a groove. a protrusion on an outer surface of the pressing member, and a recess on an inner surface of the rotating member in which the protrusion of the pressing member rotates;
3. An ink suction device as described in claim 1 or 2, wherein the inner surface of the recess has a first step which the convex portion overcomes when the positions of the abutment portion and the insertion portion are aligned, and a second step which the convex portion overcomes when the positions of the abutment portion and the insertion portion are misaligned. An ink suction device according to any one of claims 1 to 3, which has an outwardly bulging flange at the rear end of the rotating member. The ink inhaler according to claim 4, wherein the flange is made of a friction material.