JP2010017992A - Stationery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide stationery stabilizing the ejection amount of a medium when in use to stabilize quality in the use of the medium from the beginning to the end of use by preventing the consumption of the medium from affecting a medium supply pressure that pressurizes the inside of a medium storage tube by a pressurizing pump mechanism. <P>SOLUTION: The medium storage tube 6 storing the medium 5 is held in a body shaft cylinder 2, and the pressurizing pump mechanism 16 pressurizing the opening rear end 6b of the medium storage tube 6, interlocked with the knocking operation of a knock mechanism 10 provided at the rear end of the body shaft cylinder 2, is provided behind the opening rear end 6b of the medium storage tube 6. A pressure regulating mechanism 26 capable of always maintaining constant pressurizing force in the opening rear end 6b of the medium storage tube 6 in knocking operation without being affected by a decrease in the residual amount of the medium in the medium storage tube 6 is provided between the inside of the opening rear end 6b of the medium storage tube 6 and the pressurizing pump mechanism 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stationery such as a ballpoint pen, a correction pen, a glue application pen, etc., which uses ink, correction liquid, glue, etc. as a medium. The present invention relates to a stationery that can improve the quality when the medium is used by stabilizing the discharge amount of the medium during use without being affected by the consumption amount.

In a stationery equipped with a pressure pump mechanism that pressurizes the inside of the medium storage tube by a knock operation during use, for example, a ballpoint pen, after the ink storage tube is opened in the pen refill unit from the pressure pump mechanism by a knock operation during use. The ink supply pressure by the pressurized air pumped into the end portion decreases as the ink is consumed.
Therefore, the ink supply pressure cannot be stably supplied into the rear end portion of the opening of the ink storage tube from the initial use state of the ink full state to the end of use state of the minimum ink remaining state. The ink discharge amount from the pen tip provided on the surface becomes unstable, and there is a problem that the writing quality is deteriorated.

  In order to solve the above-mentioned problems, liquid grease for preventing the backflow of ink is provided in the rear end of the opening of the ink containing tube, and the front end of the ink containing tube is provided by a coil spring via an air layer behind the liquid grease. When a piston member elastically urged forward toward the pen tip side is provided and the applied pressure of the air layer pressed by the elastic force of the spring along with the knocking operation during use decreases as the ink is consumed, the coil There is known a technique in which the piston member is moved forward by the elastic force of the spring, and the air layer is compressed and pressurized to prevent a decrease in the internal pressure of the air layer (see Patent Document 1).

However, in the ballpoint pen described in Patent Document 1, the elastic force for pressurizing the air layer gradually decreases with the extension of the coil spring, so the internal pressure of the air layer cannot always be kept constant, As the ink is consumed, the amount of ink discharged from the pen tip of the ink containing tube tends to become unstable, and it is difficult to stabilize the writing quality from the initial use to the end of use.
JP 2004-168042 A

  In view of the above-described situation, the present invention is particularly advantageous in that the medium supply pressure for pressurizing the inside of the medium housing pipe by the pressurizing pump mechanism is not affected by the amount of medium consumption, and the amount of medium discharged during use. It is an object of the present invention to provide a stationery that can stabilize the quality when the medium is used from the beginning of use to the end of use.

  The above-described problems are solved by the invention having the following configuration, as described in each claim in the section “Claims”.

(1) A medium accommodating tube in which a medium is accommodated is held in the main body barrel, and a knock mechanism provided at the rear end of the main body barrel is knocked behind the rear end of the opening of the medium accommodating tube. In conjunction with this, a pressurizing pump mechanism for pressurizing the inside of the rear end of the opening of the medium accommodating tube is provided, and the remaining amount of the medium in the medium accommodating tube is reduced between the rear end of the opening of the medium accommodating tube and the pressurizing pump mechanism. A pressure adjusting mechanism is provided so that the applied pressure in the rear end portion of the opening of the medium accommodating tube during the knocking operation can be always kept constant.

(2) In the above item (1), the pressurizing pump mechanism is moved into the rear end of the opening of the medium accommodating tube by the knocking operation of the knock mechanism at the end of use of the medium remaining amount in the rear end of the opening of the medium accommodating tube. The pressure of the pressurized air that is pumped toward the direction is set so as to satisfy at least a desired pressure value for maintaining an appropriate medium discharge amount during use.

(3) In the above paragraph (1) or (2), the pressure adjusting mechanism is provided in communication with the rear end portion of the opening of the medium accommodating tube and the pressure pump mechanism; The valve hole communicates, the valve body slides so as to open and close the valve hole, and the elastic member that constantly biases the valve body in the valve closing direction.

(4) In the above item (3), the biasing force of the elastic member against the valve body is directed from the pressurizing pump mechanism into the rear end of the opening of the medium accommodating tube at least at the end of use of the medium remaining amount in the medium accommodating tube. The pressure of the pressurized air to be pumped is set so as to be maintained at a constant pressure that is the same as the initial stage of use in the medium full state in the medium housing pipe.

(5) In any one of the above items (1) to (4), the pressurizing pump mechanism is configured such that the front end opening communicates with the inside of the rear end of the opening of the medium accommodating tube via the communication path, and expands and contracts in the axial direction. A pressure member provided with a free compression chamber, and a pressing member that abuts the opening formed at the rear end of the pressure member in an axially detachable manner and presses the compression chamber in an airtight state in the compression direction; This pressing member is interlocked with the pushing operation of the knock bar in the knock mechanism.

(6) In any one of the above items (1) to (5), the present invention is applied to any of a ballpoint pen, a glue application pen, a correction pen and the like that use a medium such as writing ink, liquid glue, and correction liquid.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the medium accommodation during the knocking operation is not affected by the decrease in the remaining amount of the medium in the medium accommodation pipe between the rear end of the opening of the medium accommodation pipe and the pressure pump mechanism. Since a pressure adjustment mechanism is provided so that the applied pressure in the rear end of the opening of the pipe can be kept constant at all times, the medium supply pressure for pressurizing the inside of the medium housing pipe by the pressurization pump mechanism is changed from the initial use to the end of use. It can always be kept constant and is not affected by the consumption of the medium.
As a result, it is possible to stabilize the discharge amount of the medium at the time of use, and to stabilize the quality from the initial use to the end of use.

  According to the second aspect of the present invention, the pressurizing pump mechanism is placed in the rear end of the opening of the medium accommodating tube by the knocking operation of the knock mechanism at the end of use of the medium remaining amount in the rear end of the opening of the medium accommodating tube. Since the pressure of the pressurized air that is pumped toward the pressure is set to satisfy at least a desired pressure value for maintaining an appropriate medium discharge amount during use, the inside of the medium accommodating tube is added by the pressure pump mechanism. The medium supply pressure to be pressed can be stably maintained even at the end of use.

  According to the third aspect of the present invention, the pressure adjusting mechanism is provided with a vent path that is provided in communication between the rear end of the opening of the medium accommodating tube and the pressurizing pump mechanism, and a valve hole that is in communication with the vent path. Since the valve body is configured to slide so that the valve hole can be opened and closed and the elastic member that constantly urges the valve body in the valve closing direction, The medium supply pressure for pressurizing the inside of the end portion can be easily adjusted with a simple structure.

  According to the fourth aspect of the present invention, the biasing force of the elastic member against the valve body is directed from the pressurizing pump mechanism into the rear end of the opening of the medium accommodating tube at least at the end of use in the medium remaining amount state in the medium accommodating tube. The pressure of the pressurized air that is pumped in this way is set so as to be maintained at a constant pressure similar to the initial stage of use in the medium full state in the medium accommodating pipe. The medium supply pressure for pressurizing the inside of the rear end of the opening can be stably maintained even at the end of use.

  According to the fifth aspect of the present invention, the pressurizing pump mechanism is provided with a compression chamber having a compression chamber that has a front end opening communicated with the rear end of the opening of the medium accommodating tube via the communication passage and is elastically deformable in the axial direction. The pressure member and a pressure member that abuts the opening formed at the rear end of the pressure member so as to be able to contact and separate in the axial direction and presses the compression chamber in an airtight state in the compression direction. Is interlocked with the pushing operation of the knock bar in the knock mechanism, so that the inside of the rear end of the opening of the medium accommodating tube can be smoothly pressurized by the pressurizing pump mechanism.

  According to the invention described in claim 6, since it is applied to any one of a ballpoint pen, a glue application pen, a correction pen and the like using a medium such as a writing ink, a liquid glue and a correction liquid, it is a stationery having a good quality at the time of use. Can be obtained.

Hereinafter, the present invention will be described in detail by taking a knock-type ballpoint pen as an example.
FIG. 1 is a cross-sectional view of a knock type ballpoint pen in a non-pressurized state showing a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part in a circle A of FIG. 1, and FIG. The principal part expanded sectional view which shows the action | operation state of the pressure adjustment mechanism in a stage, FIG. 4 is sectional drawing of the knock type ball-point pen in writing use state.
In the drawing, “left side” is “front” and “right side” is “back” with respect to the page.

  As shown in FIG. 1, a ballpoint pen 1 of the present invention has a pen shaft formed of a main body shaft cylinder 2 and a pen tip member 3 screwed to the front end 2 a of the main body shaft cylinder 2. Inside, a pen refill unit 4 is loaded.

The pen refill unit 4 includes an ink storage tube 6 filled with ink 5 as a writing medium, and a pen tip 7 attached to the front end 6 a of the ink storage tube 6.
The pen tip 7 is exposed to the outside from the front end opening 3a of the pen tip member 3 by the movement of the pen refill unit 4 described later.

The opening rear end 6b side of the ink containing tube 6 is held by a holder 8 that is slidable in the axial direction of the shaft cylinder 2 in the front-rear axial direction.
The holder 8 is urged rearward by a compression spring 9 so that the pen tip 7 of the pen refill unit 4 can be stored in the pen tip member 3.

A knock mechanism 10 is assembled in the rear end portion 2 b of the main body barrel 2.
The knock mechanism 10 includes a knock portion 11, a compression spring 12 that urges the knock portion 11 rearward so that the knock portion 11 can protrude from the rear end portion 2 b of the main body barrel 2, and the urging force of the compression spring 12. A knock bar 13 that cooperates with the pushing-in operation of the knocking portion 11 to resist and the opening operation thereof, and a cam mechanism portion 14 that is interlocked with the knocking rod 13 are configured.

The cam mechanism portion 14 is provided with a rotor 15 that cooperates with the pushing operation of the knock portion 11 and the opening operation thereof.
In this case, the spring force of the compression spring 12 is set to be smaller than the spring force of the compression spring 9.

That is, the knock mechanism 10 pushes the knock bar 13 against the urging force of the compression spring 12 by the knocking operation of the knock part 11, and releases the rotor 15 in the cam mechanism part 14. It can be moved in the axial direction while being driven to rotate.
This is a well-known mechanism (for example, see Japanese Patent Publication No. 34-7181) that causes the pen tip 7 to move into and out of the retracted state or the protruding state as the pen refill unit 4 moves.

A pressure pump mechanism 16 is provided between the opening rear end 6 b of the ink containing tube 6 and the front end 15 a of the rotor 15.
As shown in FIG. 2, the pressurizing pump mechanism 16 includes a pressing member 17 that moves linearly in a non-rotating state in the axial direction in conjunction with the rotational drive of the rotor 15, and the pressing member 17 and the ink storage tube. 6 and the pressure member 20 provided between the rear end 6b of the opening.

The pressing member 17 is formed by a front end ventilation portion 18 and a seal shoulder portion 19 which is stepped on the rear side of the front end ventilation portion 18 and has a larger diameter than the front end ventilation portion 18.
The pressurizing member 20 has a compression chamber 22 formed of an elastic cylinder 21 made of an elastomer such as rubber, and is protruded rearward at the center of the rear wall 21a at the rear of the compression chamber 22. The rear end opening 23 is opened, and the flange-shaped front end opening 24 is integrally extended from the rear of the holder 8 holding the opening rear end 6b of the ink containing tube 6 via the seal ring 25. In addition, it is brought into contact with the rear surface of a valve component 27 constituting a pressure adjusting mechanism 26 described later in an airtight state.

  The front end of the front end ventilation portion 18 in the pressing member 17 is formed with an enlarged diameter locking portion 18a that is press-fitted into the compression chamber 22 from the rear end opening 23 of the pressure member 20, and the outer peripheral surface thereof. Between the pressure member 20 and the inner peripheral surface of the rear end opening 23, an air passage 18b that can communicate with the outside air along the axial direction is formed.

The seal shoulder 19 of the pressing member 17 can be brought into contact with and separated from the rear end opening 23 of the pressing member 20, and as shown in FIG. 3, at the initial stage of the knocking operation of the knocking portion 11 in the knocking mechanism 10. When the pressing member 17 moves linearly in the axial direction in a non-rotating state in conjunction with the rotor 15, the pressing member 17 abuts against the rear end opening 23 of the pressing member 20, The ventilation path 18b can be closed.
As a result, the compression chamber 22 that is elastically deformable elastically in the axial direction is formed, and the inside of the compression chamber 22 can be maintained in an airtight state.

  The compression chamber 22 is moved from the pressurizing pump mechanism 16 to the ink containing tube 6 by the knocking operation of the knocking mechanism 10 at the end of use, which is the minimum remaining amount of the ink 5 in the rear end 6b of the ink containing tube 6. A volume that can accommodate an amount of air such that the pressure applied by the pressurized air that is pumped toward the rear end 6b of the opening always satisfies at least a certain pressure value for maintaining an appropriate ink discharge amount during use. Is set to

The pressure adjusting mechanism 26 penetrates through the valve structure 27 in the front-rear direction, and communicates between the opening rear end 6 b of the ink containing tube 6 and the rear end opening 23 of the pressure member 20. The valve hole 29 is opened so as to communicate with the upper part of the vent passage 28, and the opening periphery of the valve hole 29 is closed from above to below via a seal member 30 made of an O-ring such as butyl rubber. The valve body 31 having a sliding property such as polyacetal that slides as possible, and a coil spring 32 that elastically biases the valve body 31 in the valve closing direction of the valve hole 29 that always faces downward. Yes.
In this case, the seal member 30 and the valve body 31 arranged at the opening periphery of the valve hole 29 may be integrally formed by two-color molding.

The coil spring 32 passes from the pressurizing pump mechanism 16 through the communication path 28 to the inside of the opening rear end 6b of the ink containing tube 6 at least at the end of use when the ink 5 is at the minimum remaining amount in the ink containing tube 6. When the pressure applied by the pressurized air that is pumped toward the pressure is greater than the air pressure that matches the appropriate discharge amount of the ink 5 from the pen tip 7 during use, the valve element 31 is automatically directed upward. By making the valve movable and opening the valve hole 29, it is adjusted so as to always maintain a constant pressure similar to the initial stage of use of the ink 5 in the ink storage tube 6 in the full state.
Thus, the pressure in the rear end 6b of the ink containing tube 6 during the knocking operation is always kept constant without being affected by the decrease in the remaining amount of ink in the ink containing tube 6.

Next, the pressurizing action of the ballpoint pen 1 in this embodiment will be described.
In the non-pressurized state shown in FIG. 1 and FIG. 2, as shown in FIG. 3, the knock part 11 of the knock mechanism 10 is directed forward in a half step against the urging force of the compression spring 12 at the initial stage of the knock operation. When the push-in operation is performed, the knock bar 13 moves forward in cooperation with this operation, and the rotor 15 in the cam mechanism 14 rotates and moves forward in a half drive state.

The pressing member 17 is linked to the rotational movement of the rotor 15 toward the front, and moves linearly toward the front in a non-rotating state. 20 is brought into contact with the rear end opening 23 and closed.
Thereby, the communication state between the air passage 18b formed on the outer periphery of the front end ventilation portion 18 and the outside air is blocked, and the inside of the compression chamber 25 becomes airtight.
Subsequently, the rear wall 21a of the elastic cylindrical body 21 in the pressurizing member 20 is pushed forward to be elastically compressed and deformed, and the inside of the compression chamber 22 is pressurized.

The spring force of the compression spring 12 is set to be smaller than the spring force of the compression spring 9 that biases the pen refill unit 4 backward.
For this reason, even if the knock part 11 is pushed in half, the pen refill unit 4 does not move forward, and the pen tip 7 remains maintained in the pen tip member 3 in the retracted state. .

  Next, when the knock portion 11 is pushed forward by a force stronger than the spring force of the compression spring 9, the knock bar 13 moves forward in cooperation with this operation, and the cam mechanism portion. The rotor 15 is further driven via 14.

The pressing member 17 linearly moves again in a non-rotating state by driving the rotor 15, compresses the inside of the compression chamber 22 in an airtight state, as shown in FIG. The pressurized air in the chamber 22 is pumped toward the communication path 28.
At this time, if the pressurized air is larger than the air pressure set so as to match the proper discharge amount of the ink 5 from the pen tip 7 at the time of use, the valve body 31 is caused by the elastic biasing force of the coil spring 32. On the contrary, it automatically slides upward to open the valve hole 29 and discharge the pressurized air in the communication passage 28 to the outside through a gap formed in the main body cylinder 2. Thus, the excessive pressure in the communication passage 28 is reduced.

When the pressure applied by the pressurized air in the communication passage 28 reaches a predetermined set pressure by opening the valve hole 29, the valve element 31 slides downward by the elastic biasing force of the coil spring 32. At the same time, the valve hole 29 is closed, and at the same time, the pressurized air reduced to a predetermined set pressure is pumped toward the opening rear end portion 6b of the ink containing tube 6 so that the inside of the ink containing tube 6 is properly treated. Pressurize the pressure to match the ink discharge amount.
At this time, since the pushing force of the knock portion 11 is larger than the spring force of the compression spring 9 that urges the penfill feel unit 4 backward, the pen fill feel unit 4 moves forward, as shown in FIG. In addition, the pen tip 7 protrudes from the inside of the pen tip member 3 at the front end 2a of the shaft tube 2 to the outside through the opening 3a at the front end.

Next, when the pushing operation of the knock part 11 is released, only the knock bar 13 is returned to the desired rearward locking position by the urging force of the compression spring 12, and the rotor 15 is locked at the driving position. 7 maintains the protruding state, and the pressing member 17 keeps pressing the rear wall 21a of the elastic cylindrical body 21 in the pressing member 20, so that the inside of the compression chamber 22 is pressurized with a predetermined pressure. State is maintained.
Thereby, when the pen is used, the inside of the ink containing tube 6 can be constantly maintained in a constant pressure state, so that the ejection amount of the ink 5 at the time of writing can be stabilized, and the writing quality can be improved. Writing with the pen tip facing upward can also be performed stably and reliably.

After the pen is used, when the knock part 11 is pushed forward again against the urging force of the compression spring 12 and the knock bar 13 is operated, the locked state of the rotor 15 in the cam mechanism part 14 is achieved. When the knock bar 13 is returned to the rear by the biasing force of the compression spring 12 and released, the rotor 15 moves rearward together with the pressing member 17 by the biasing force of the compression spring 9, and is shown in FIGS. Return to the original position and state.
At the same time, as the pressing member 17 moves backward, the rear wall 21a of the elastic cylindrical body 21 in the pressure member 20 is pulled backward by the enlarged diameter locking portion 18a of the front end ventilation portion 18. The compression chamber 22 returns from the compressed state to the expanded state, and the compression chamber 22 in the ink containing tube 6 and the elastic cylindrical body 21 again has the rear end opening 24 of the seal shoulder 19 as the pressing member 17 moves backward. As a result of the release from the air passage 18b, the air passage 18b of the front end ventilation portion 18 is opened to enter a ventilation state, and the pressurized state in the ink containing tube 6 is released.
Thereby, a knocking operation can be easily performed with a small force, and a pressure pen excellent in usability can be obtained.

  FIG. 5 is an enlarged cross-sectional view of the main part of the knock-type ballpoint pen in the non-pressurized state showing the second embodiment of the present invention, and FIG. 6 is an enlarged main part showing the operating state of the pressure adjusting mechanism in the initial stage of the knock operation. It is sectional drawing.

In this embodiment, the structure of the pressure adjustment mechanism 26 in the first embodiment is improved. As shown in FIG. 5, as shown in FIG. In a pressure adjustment mechanism 36 provided between the mechanism 35 and the mechanism 35, a valve hole 39 that expands downward in a tapered shape is formed in a lower portion of a communication path 38 that penetrates and communicates with the inside of the valve structure 37. It is opened so that it can communicate.
Next, the valve body 40 is provided via a seal member 41 formed of an O-ring so that the opening periphery of the valve hole 39 can be closed from below to above, and the valve body 40 is provided with a coil spring 42. Therefore, the valve hole 39 that is always directed upward is elastically biased in the valve closing direction.

  That is, in the initial stage of the knock operation, the pressure adjusting mechanism 36 has the pressurized air pressurized from the pressure pump mechanism 35 larger than the air pressure set to match the appropriate ink discharge amount from the pen tip. In some cases, as shown in FIG. 6, the valve body 40 automatically slides downward against the elastic biasing force of the coil spring 42, opens the valve hole 39, and opens the communication passage 38. When the pressure of the pressurized air in the communication passage 38 reaches a predetermined pressure, the valve body 40 is directed upward by the elastic biasing force of the coil spring 42. The valve hole 39 is closed by sliding.

  In each of the embodiments described above, a ballpoint pen that uses writing ink as a medium has been described as an example of a stationery, but in addition, a paste application pen that uses liquid glue, a correction pen that uses correction liquid, and the like. Can also be applied.

It is sectional drawing of the knock type ball-point pen in the non-pressurized state which shows 1st Embodiment of this invention. It is a principal part expanded sectional view in the circle A of FIG. Similarly, it is a principal part expanded sectional view which shows the operating state of the pressure adjustment mechanism in the knock operation initial stage. It is sectional drawing of the knock type ball-point pen in writing use condition. It is a principal part expanded sectional view of the knock type ball-point pen in the non-pressurized state which shows 2nd Embodiment of this invention. Similarly, it is a principal part expanded sectional view which shows the operating state of the pressure adjustment mechanism in the knock operation initial stage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Knock-type ball-point pen 2 Main body axial cylinder 2a Front end part 2b Rear end part 3 Pen tip member 3a Opening part 4 Pen refill unit 5 Ink (medium)
6 Ink storage tube 6a Front end 6b Open rear end 7 Pen tip 8 Holder 9 Compression spring 10 Knock mechanism 11 Knock bar 12 Compression spring 13 Knock bar 14 Cam mechanism 15 Rotor 15a Front end 16 Pressure pump mechanism 17 Pressing member 18 Front end ventilation portion 18a Diameter expansion locking portion 18b Vent passage 19 Seal shoulder portion 20 Pressurizing member 21 Elastic cylindrical body 21a Rear wall 22 Compression chamber 23 Rear end opening portion 24 Front end opening portion 25 Seal ring 26 Pressure adjusting mechanism 27 Valve component 28 Communication path 29 Valve hole 30 Seal member 31 Valve body 32 Coil spring (elastic member)
33 Main body barrel 34 Ink storage tube 34a Open rear end 35 Pressure pump mechanism 36 Pressure adjustment mechanism 37 Valve component 38 Communication path 39 Valve hole 40 Valve body 41 Seal member 42 Coil spring

Claims (6)

A medium accommodating tube in which a medium is accommodated is held in the main body cylinder, and in synchronization with the knocking operation of the knock mechanism provided at the rear end of the main body cylinder, behind the rear end of the opening of the medium accommodating pipe. And providing a pressurizing pump mechanism for pressurizing the inside of the rear end of the opening of the medium containing tube,
Between the rear end portion of the opening of the medium accommodating tube and the pressurizing pump mechanism, the pressure in the rear end portion of the opening of the medium accommodating tube during the knocking operation is not affected by the decrease in the remaining amount of the medium in the medium accommodating tube. A stationery provided with a pressure adjustment mechanism that can be kept constant at all times.   The pressure of the pressurized air pumped by the knock mechanism knocking operation toward the rear end of the opening of the medium accommodating pipe at the end of use of the medium remaining amount in the rear end of the opening of the medium accommodating pipe. The stationery according to claim 1, wherein the stationery is set so as to satisfy at least a desired pressure value for maintaining an appropriate medium discharge amount during use.   An air passage provided by connecting the pressure adjusting mechanism between the rear end of the opening of the medium accommodating tube and the pressurizing pump mechanism, a valve hole communicating with the air passage, and the valve hole can be opened and closed. The stationery according to claim 1 or 2, comprising a sliding valve body and an elastic member that constantly biases the valve body in a valve closing direction.   The pressure of the pressurized air pumped from the pressure pump mechanism toward the rear end of the opening of the medium accommodating tube is applied to the urging force of the elastic member with respect to the valve body at least at the end of use in the medium remaining amount state in the medium accommodating tube. The stationery according to claim 3, wherein the stationery is set so as to be maintained at a constant pressure similar to that in the initial stage of use in a medium full state in the medium accommodating tube.   The pressure pump mechanism includes a pressure member including a compression chamber whose front end opening communicates with the rear end of the opening of the medium accommodating tube via the communication path and is elastically deformable in the axial direction. A pressing member that abuts the opening formed at the end in an axially detachable manner and presses the compression chamber in an airtight state in the compression direction, and the pressing member pushes the knock bar in the knock mechanism. The stationery according to any one of claims 1 to 4, which is linked to the stationery.   The stationery according to any one of claims 1 to 6, which is applied to any of a ballpoint pen, a glue application pen, a correction pen, and the like that use a medium such as writing ink, liquid glue, and correction liquid.

Images