JP2010105309A - Stationery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stationery capable of substantially constantly keeping a medium supply pressure for pressurizing the interior of a medium storage pipe by means of a pressurizing pump mechanism from the beginning of usage to the end of usage, thereby, stabilizing the ejection amount of a medium upon usage, stabilizing the quality upon usage and, at the same time, enhancing quick response for a pressure change in the medium storage pipe that is pressurized and adjusted in accordance with the amount of consumption of the medium. <P>SOLUTION: A pressure adjustment mechanism 27 configured so as to substantially constantly keep pressurizing force in the opening back end part of an ink storage pipe 6 upon knock operation is disposed between the opening back end part 6b of the ink storage pipe 6 in a body shaft cylinder 2 and a pressurizing pump mechanism 16. The pressure adjustment mechanism comprises: an air passage 25 disposed between the opening back end part of the ink storage pipe and the pressurizing pump mechanism so as to communicate with them; an air accumulation part 28 disposed so as to communicate with the air passage; and an energizing means 30 for energizing the air accumulation part in the crushing direction so as to be a crush-deformation state in the air-passing state of the pressurizing pump mechanism upon the non-usage. <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. A stationery that can stabilize the quality of the medium from the beginning of use to the end of use by stabilizing the discharge amount of the medium at the time of use without being affected by the consumption. About.

In a conventional stationery, for example, a knock-type pressure ballpoint pen, the medium supply pressure by the pressurized air that is pumped from the pressure pump mechanism into the rear end of the ink storage tube in the pen refill unit by the knocking operation at the time of use is Decreases with consumption.
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 pressure in the ink storage tube is adjusted according to the amount of ink consumed. The responsiveness to pressure changes is reduced, the internal pressure of the air layer cannot be maintained substantially constant, and the ink discharge amount from the pen tip of the ink containing tube tends to become unstable with the consumption of ink, There was a problem that it was difficult to stabilize the writing quality from the beginning of use to the end of use.
JP 2004-168042 A

  In view of the above-mentioned present situation, the present invention maintains the medium supply pressure for pressurizing the inside of the medium housing tube by the pressurizing pump mechanism from the initial use to the final use, thereby reducing the amount of discharged medium during use. An object of the present invention is to provide a stationery that can stabilize, stabilize the quality during use, and improve the responsiveness to pressure changes in the medium containing tube that is pressure adjusted according to the consumption of the medium. And

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

(1) A pen refill unit including a medium accommodating tube in which a medium is accommodated is held in the main shaft, and the main shaft cylinder is used behind the rear end of the medium accommodating tube in the pen refill unit when in use. A pressurizing pump that presses the inside of the rear end of the opening of the medium accommodating tube at the same time as the pen tip of the pen refill unit projects from the front end of the main body barrel in conjunction with the knocking operation of the knock mechanism provided at the rear end A mechanism is provided, and the rear end of the opening of the medium accommodating tube during the knocking operation is not affected by a decrease in the remaining amount of the medium in the medium accommodating tube between the rear end of the opening of the medium accommodating tube and the pressure pump mechanism. Provided with a pressure adjusting mechanism capable of maintaining the applied pressure in the section substantially constant, and this pressure adjusting mechanism is provided in communication between the rear end of the opening of the medium accommodating tube and the pressure pump mechanism. The An air passage, an air reservoir provided in communication with the air passage, and capable of bulging by excess pressurized air pumped from the pressurizing pump mechanism toward the rear end of the opening of the medium housing tube, The air reservoir is configured by urging means for urging in the crushing direction so as to be in a crushing deformed state when the pressure pump mechanism is vented when not in use.

(2) In the above item (1), the biasing means is excessively pumped from the airtight pressure pump mechanism through the air passage into the rear end of the opening of the medium accommodating tube by a knock operation during use. By expanding the air reservoir with a pressurized air, the pressure applied to the rear end of the opening of the medium accommodating tube at the initial stage of use in the medium full state in the medium accommodating tube becomes substantially constant. In addition, the compressed air in the air reservoir is gradually crushed and deformed by the urging force of the air reservoir in the bulging state according to the amount of decrease in the medium in the medium storage tube. The pressure applied at the end of use in at least the medium remaining amount state in the medium accommodating tube is constant pressure that is the same as in the initial use in the medium full state in the medium accommodating tube. To maintain To.

(3) In the above item (1) or (2), 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 air passage and is expandable and contractable in the axial direction. A pressure member including a compression chamber, and a pressing member that abuts on and away from the opening formed at the rear end of the pressure member in an axial direction and presses the compression chamber in an airtight state in the compression direction. The pressing member is interlocked with the pushing operation of the knock bar in the knock mechanism.

(4) In any of the above items (1) to (3), 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 it has a pressure adjustment mechanism that keeps the applied pressure in the rear end of the tube opening constant, the medium supply pressure for pressurizing the inside of the medium housing tube by the pressure pump mechanism is changed from the initial use to the end of use. Can be maintained substantially constant until the amount of discharge of the medium during use can be stabilized, and the quality during use can be stabilized.
Further, the pressure adjusting mechanism is provided to communicate between the rear end of the opening of the medium accommodating tube and the pressurizing pump mechanism, and is provided to communicate with the vent path. An air reservoir that can swell by excess pressurized air that is pumped toward the rear end of the opening of the housing tube, and a state in which the air reservoir is crushed and deformed in a ventilation state of the pressurizing pump mechanism during non-knock operation. Since the urging means for urging in the crushing direction is configured as described above, it is possible to improve the responsiveness to the pressure change in the medium accommodating tube whose pressure is adjusted according to the consumption amount of the medium.

  According to the second aspect of the present invention, the urging means is pumped from the sealed pressure pump mechanism through the air passage toward the rear end of the opening of the medium accommodating tube by a knocking operation during writing. By allowing the air reservoir to swell with pressurized air, the pressure applied to the rear end of the opening of the medium accommodating tube at the initial stage of use in the medium full state in the medium accommodating tube is substantially constant. In addition, in accordance with the amount of medium reduction in the medium accommodating tube, the air reservoir portion in the bulging state is gradually crushed and deformed by the urging force, and the pressurized air in the air reservoir portion is Pumped toward the rear end of the opening, and at least the applied pressure at the end of use in the medium remaining amount state in the medium accommodating tube is a constant pressure similar to that at the initial use in the medium full state in the medium accommodating tube. Set to be maintained. Therefore, the medium supply pressure for pressurizing the opening rear end portion of the medium containing tube by pressurizing pump mechanism can be even used end, stably maintained.

  According to the third aspect of the present invention, the pressurizing pump mechanism is provided with a compression chamber including a compression chamber whose front end opening communicates with the rear end of the opening of the medium accommodating tube via the air 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 4, 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, a stationery having a good quality at the time of use. Can be obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a knock-type ballpoint pen during a non-knock operation showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part in a circle II part of FIG. 1, and FIG. 4 is a cross-sectional view of the knock-type ballpoint pen showing the operating state of the pressure adjusting mechanism in the initial use in the full state, FIG. 4 is an enlarged cross-sectional view of a main part in a circle IV part of FIG. 3, and FIG. FIG. 6 is a cross-sectional view of the knock type ballpoint pen showing the operating state of the pressure adjustment mechanism at the end of use in the minimum remaining amount state, and FIG. 6 is an enlarged cross-sectional view of the main part in the circle VI part of FIG.
In the drawing, “left side” is “front” and “right side” is “back” with respect to the page.

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

The pen refill unit 4 includes a medium storage tube (hereinafter referred to as 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 a pressing member 18 provided between the rear opening 6b and the opening rear end 6b.

  The pressing member 17 is formed by a front end ventilation portion 17a and a seal shoulder portion 17b formed in a stepped manner behind the front end ventilation portion 17a and having a larger diameter than the front end ventilation portion 17a.

  The pressurizing member 18 is formed with a compression chamber 20 by a bottomed elastic cylinder 19 made of an elastomer such as rubber, and in the center of the rear wall 20a on the rear side of the compression chamber 20 toward the rear. The protruding rear end opening 21 is opened.

  The front of the compression chamber 20 is formed in a flange-shaped front end opening 22, and the front end opening 22 holds the opening rear end 6 b of the ink containing tube 6 via a seal ring 23. A rear end surface 24a of the bottomed cylindrical connecting member 24, which is provided between the rear end surface and the pressure member 18 and opens toward the front, is brought into contact with the airtight state.

  The front end of the front end ventilation portion 17a of the pressing member 17 is formed with an enlarged diameter locking portion 17c that is press-fitted into the compression chamber 20 from the rear end opening 21 of the pressurizing member 18, and has an outer peripheral surface. A gap a that can communicate with the outside air along the axial direction is formed between the pressure member 18 and the inner peripheral surface of the rear end opening 21 of the pressure member 18.

The sealing shoulder 17b of the pressing member 17 can be brought into contact with and separated from the rear end opening 21 of the pressing member 18, and as shown in FIGS. 3 and 4, the knocking operation by the knocking portion 11 of the knocking mechanism 10 is performed. Sometimes, the pushing operation at the initial stage is caused by the forward movement of the pressing member 17 that moves linearly in the axial direction in a non-rotating state in conjunction with the rotor 15. So that the gap a can be closed.
Thus, the compression chamber 20 that is elastically deformable in the axial direction is formed, and the inside of the compression chamber 20 can be maintained in an airtight state.

  The compression chamber 20 is moved from the pressurizing pump mechanism 16 to the ink containing pipe 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 pipe 6. Excessive pressurization so that the pressurizing force by the pressurized air pumped toward the rear end 6b of the opening always satisfies a substantially constant pressure value for at least maintaining an appropriate ink discharge amount at the time of use. The volume is set so that it can be pumped with compressed air.

  The connecting member 24 is provided with an air passage 25 that communicates between the compression chamber 20 of the pressurizing pump mechanism 16 and the opening rear end portion 6b of the ink containing tube 6, and the air passage 25 communicates with the air passage 25. A pressure adjusting mechanism 27 is provided in communication with the groove 26.

The pressure adjusting mechanism 27 includes a bag-like air reservoir 28 that can be expanded by excess pressurized air that is pumped from the compression chamber 20 of the pressurizing pump mechanism 16 toward the rear end 6b of the ink storage tube 6. The air reservoir 28 is pressed in the crushing direction so as to be in a crushing deformed state, the movable member 29 is movable in the front-rear direction in the connecting member 24, and the movable member 29 is always attached to the front air reservoir 28. The compression spring 30 is urged in the crushing direction.
Here, the “collapse deformation” means that the air reservoir 28 is deformed into a contracted state by the forward pressing by the movable member 29 urged by the compression spring 30.

As shown in FIG. 2, the air reservoir 28 can always maintain the crushing deformation state by the urging force of the compression spring 30 in the ventilation state of the pressurizing pump mechanism 16 during the non-knock operation.
In this case, as the air reservoir 28, a material such as a thin elastomer whose shape can be changed sensitively to the pressure change of excess pressurized air fed from the compression chamber 20, or a bellows-like bent or movable member, for example. For example, a material in which an elastomer is impregnated and solidified so that it can withstand friction during pressing by the pressure 29 is used, and the balance is maintained by the biasing force of the compression spring 30 and the pressure in the system in the ink containing tube 6. Therefore, a material having no waist is preferable.

  As shown in FIG. 4, the compression spring 30 is pumped from the sealed pressure pump mechanism 16 through the air passage 25 toward the opening rear end 6 b of the ink containing 6 by a knocking operation during writing. By allowing the air reservoir 28 to bulge through the communication groove 26 by excess pressurized air in the pressurized air, the ink storage 6 is fully used in the ink full state. The biasing force is set so that the pressure applied to the rear end 6b of the ink containing tube 6 is substantially constant.

The compression spring 30 pressurizes the air reservoir 28 while gradually crushing and deforming the swelled air reservoir 28 by its urging force according to the amount of ink decrease in the ink containing tube 6. The air can be pumped toward the opening rear end 6b of the ink storage tube 6 and, as shown in FIGS. 5 and 6, at least the end-of-use state in the ink minimum remaining state in the ink storage tube 6 The applied pressure is set so as to be maintained at a substantially constant pressure as in the initial stage of use in the ink full state in the ink storage 6.
As a result, the pressure in the rear end 6b of the ink containing tube 6 during the knocking operation is maintained substantially 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 FIGS. 1 and 2, as shown in FIGS. 3 and 4, the knock portion 11 of the knock mechanism 10 at the initial stage of the knocking operation is half-staged against the urging force of the compression spring 12. When the push-in operation is performed forward, the knock bar 13 moves forward in cooperation with this operation, and the rotor 15 in the cam mechanism portion 14 rotates forward in a half drive state.

The pressing member 17 is linked to the rotational movement of the rotor 15 toward the front, moves linearly toward the front in a non-rotating state, and the seal shoulder 17b at the front end thereof is moved to the pressurizing member. 18 is closed by abutting against the rear end opening 21.
Thereby, the communication state between the gap a formed on the outer periphery of the front end ventilation portion 17a and the outside air is blocked, and the inside of the compression chamber 20 is airtight.
Next, the rear wall 20a of the compression chamber 20 in the pressurizing member 18 is pushed forward to pressurize the inside of the compression chamber 20 by elastically compressing and deforming the inside.

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 20 in an airtight state, as shown in FIG. The pressurized air in the chamber 20 is pumped toward the air passage 25.

If the pressurized air is excessively higher than the air pressure set to match the proper discharge amount of the ink 5 from the pen tip 7 during use, the excess compressed air causes the communication groove 26 to enter the ventilation path 25. The pressurized air reduced to a predetermined set pressure is obtained by expanding the air reservoir 28 communicating with the pressure spring 30 against the urging force of the compression spring 30 and reducing the excessive pressure in the air passage 25. Is pressure-fed toward the opening rear end 6b of the ink containing tube 6 to pressurize the inside of the ink containing tube 6 to a pressure suitable for an appropriate ink discharge amount.
At this time, the pushing force of the knock portion 11 is larger than the spring force of the compression spring 9 that urges the pen refill unit 4 rearward, so that the pen refill 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 20a of the compression chamber 20 in the pressing member 18, so that the inside of the compression chamber 20 is in a pressurized state with a predetermined pressure. Is maintained.
Thereby, when the pen is used, the inside of the ink containing tube 6 can be maintained in a substantially constant pressurized state, so that the ejection amount of the ink 5 at the time of writing is stabilized, and the writing quality can be improved. In addition, writing with the pen tip facing upward can 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 20a of the compression chamber 20 in the pressurizing member 18 is drawn rearward by the enlarged diameter locking portion 17c of the front end ventilation portion 17a. From the compressed state to the extended state, the inside of the ink containing tube 6 and the compression chamber 20 again from the rear end opening 21 in the pressurizing member 18 of the seal shoulder 17b accompanying the return movement of the pressing member 17 to the rear. As a result of the separation, a gap a is formed again between the outer peripheral surface of the front end ventilation portion 17c and the inner peripheral surface of the rear end opening portion 21 to enter the 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.

It is sectional drawing of the knock type ball-point pen at the time of non-knock operation which shows one Embodiment of this invention. It is a principal part expanded sectional view in the circle | round | yen II part of FIG. FIG. 6 is a cross-sectional view of a knock type ballpoint pen showing an operating state of a pressure adjusting mechanism at an initial stage of use in an ink full state in an ink containing tube. FIG. 4 is an enlarged cross-sectional view of a main part in a circle IV part of FIG. 3. FIG. 5 is a cross-sectional view of a knock type ballpoint pen showing an operating state of a pressure adjusting mechanism at the end of use in a state where ink is in a minimum remaining amount in an ink storage tube. FIG. 6 is an enlarged cross-sectional view of a main part in a circle VI part of FIG. 5.

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 (medium 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 Press member 17a Front end vent 17b Seal shoulder portion 17c Diameter expansion locking portion 18 Pressurizing member 19 Elastic cylinder 20 Compression chamber 20a Rear wall 21 Rear end opening 22 Front end opening 23 Seal ring 24 Connecting member 24a Rear end surface 25 Ventilation path 26 Communication groove 27 Pressure adjustment Mechanism 28 Air reservoir 29 Movable member 30 Compression spring (biasing means)
a Clearance

Claims (4)

A medium accommodating tube in which a medium is accommodated is held in the main body cylinder, and a knock mechanism provided at the rear end of the main body cylinder is knocked behind the rear end of the opening of the medium accommodating pipe when used. 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 adjustment mechanism that can maintain the pressure applied in the rear end of the opening of the medium accommodating tube at the time of knock operation substantially constant without being affected by
The pressure adjusting mechanism is provided in communication between the rear end of the opening of the medium containing pipe and the pressurizing pump mechanism, and is provided in communication with the vent path. An air reservoir that can be swelled by excess pressurized air that is pumped toward the rear end of the opening of the tube, and a state in which the air reservoir is crushed and deformed in a ventilation state of the pressure pump mechanism when not in use. A stationery characterized by comprising urging means for urging in the direction of crushing.   When the urging means is knocked at the time of use, the air reservoir is removed by excess pressurized air that is pumped from the airtight pressure pump mechanism through the air passage toward the rear end of the opening of the medium accommodating tube. By bulging, the applied pressure into the rear end of the opening of the medium accommodating tube at the initial stage of use in the medium full state in the medium accommodating tube is substantially constant, and the medium in the medium accommodating tube The compressed air in the air reservoir is pumped toward the rear end of the opening of the medium accommodating tube while gradually crushing and deforming the air reservoir in the bulging state according to the amount of decrease. In addition, the pressure applied at the end of use in at least the medium remaining amount state in the medium accommodating tube is set to be maintained at a constant pressure similar to that in the initial use in the medium full state in the medium accommodating tube. Stationery according to 1.   A pressure pump mechanism includes a pressure member having a compression chamber that has a front end opening portion that communicates with the rear end portion of the opening of the medium accommodating tube via a vent passage and that can be expanded and contracted in the axial direction, and a rear portion of the pressure member. 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 this pressing member is operated to push the knock bar in the knock mechanism. The stationery according to claim 1 or 2, wherein the stationery is linked to the stationery.   The stationery according to any one of claims 1 to 3, wherein the stationery 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.

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