JP2011173317A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide writing utensils that can surely prevent ink leakage from a pen point by eliminating rolling in of air, that has no dust generated in the pen point, and that facilitates exchange of an ink tank as well as confirmation of a remaining quantity through flexibility of the ink tank. <P>SOLUTION: An ink feeding mechanism 14 has, in a cylindrical storing shaft 20, a storing space 16 for temporarily holding ink made to flow in from the ink tank 12 and a valve body 18 for preventing the ink in the storing space 16 from returning back to the ink tank 12 and for delivering the ink only to a pen core 10 side. By moving the pen core 10 to the rear end side, the ink in the storing space 16 is supplied to the pen core 10, with the valve body 18 engaged with a guide piston body 22 to block the passage of the guide piston body 22. Thereafter, the pen core 10 is moved from the rear end side to the front end side, thereby moving the ink in the ink tank 12 into the storing space 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention can be used for various purposes such as board markers and industrial markers, and has industrial benefits such as use by users with high environmental awareness due to low waste after writing. It relates to a certain writing instrument.

  In recent years, a technique for replacing an ink tank (ink cartridge) has been proposed for a writing instrument for marking an object for reasons such as a reduction in environmental load.

  For example, JP-A-2001-287494 (Patent Document 1) discloses an ink tank exchangeable writing instrument. However, in this writing instrument, the pressure inside the ink tank rises due to a change in temperature, a change in atmospheric pressure, etc., and when the valve is opened at the time of writing or the like, unexpected ink ejection or leakage may occur from the pen tip.

  Therefore, as disclosed in Japanese Patent Application Laid-Open No. 2000-177290 (Patent Document 2), an applicator using a flexible container as an ink tank has been proposed.

  However, in this type of applicator, since the nib tip is also integrated with the ink tank of the flexible container, when replacing the ink tank, it is necessary to replace even the nib tip. The tip tip dust is generated.

  Moreover, since it is necessary to bend a flexible container with the dead weight of a liquid in order to make a liquid flow out, the stable application | coating is difficult.

  JP-A-2005-218961 (Patent Document 3) is an applicator using a flexible container as an ink tank. With this applicator, it is possible to separate the ink tank from the applicator member, but there is a possibility of air substitution during application, and stable application is difficult.

  Japanese Utility Model Laid-Open No. 07-004364 (Patent Document 4) is a pump incorporating a soft bag. Considering that this is used as a writing instrument and a writing instrument having a pen core attached to a piston member is considered, there is a problem that when used in the opposite direction, the pump does not operate and the flow does not flow out.

JP 2001-287494 A JP 2000-177290 A Japanese Patent Laid-Open No. 2005-218961 Japanese Utility Model Publication No. 07-004364

  In view of such circumstances, the present invention eliminates air entrainment and can reliably prevent ink leakage from the pen tip, can easily replace the ink tank without generating dust at the pen tip, and can be used as an ink tank. The present invention intends to provide a writing instrument that is bent to easily check the remaining amount.

The present invention is a writing instrument having an ink supply mechanism in which a pen core is attached to the front end side and an ink tank that is flexible as ink is consumed is attached to the rear end side.
An ink supply mechanism includes a storage space portion that temporarily stores ink that has flowed in from the ink tank, and a valve body that restricts the ink in the storage space portion from returning to the ink tank and sends the ink only to the pen core side. And a guide piston body that moves back and forth together with the pen core, and a guide structure that has a communication path for distributing ink to the front pen core in the inner peripheral portion and a piston structure in the outer peripheral portion, and a guide The piston body is restricted from moving in the rotational direction and the piston structure is in sliding contact with the inner peripheral surface, the valve body is in contact with the rear surface of the inner protruding wall and restricts forward movement, and the ink tank A receiving body comprising a rear portion in which a communicating hole is formed to be open, and the inside of which is an accommodation space portion, and the valve body that abuts and separates from the opening of the communicating hole of the receiving body to close and open the communicating port And
The guide piston body and the valve body are respectively provided with engaging portions that engage with each other when the guide piston body moves to the rear end side, and when the guide piston body and the valve body move from the rear end side to the front end side, The valve body is in contact with the inner projecting wall of the part so that the engagement between the engaging parts is disengaged,
When the ink supply mechanism is not in use, the valve body closes the communication hole in the rear part of the receiving body, and when in use, the guide piston body moves to the rear end side as the pen core moves to the rear end side. As a result, the ink in the housing space flows through the communication path to the pen core, the valve body engages with the guide piston body, and closes the communication path of the guide piston body, and then the pen core is moved to the front end side. When returning, both the guide piston body and the valve body move to the front end side, and when the ink circulates from the ink tank into the accommodation space and the pen core has returned to the front end side, the valve body is in the center of the receiving body. The writing tool is characterized in that the valve body moves rearward by contacting the inner projecting wall of the part and returns to a non-use state in which the communication hole in the rear part of the receiving body is closed.

  In the present invention, the engaging portion of the guide piston body forms an engaging projection on the inner periphery of the rear portion thereof, and the valve body extends forward to form a rod portion, and the front portion of the rod portion serves as an engaging portion. It is preferable that an engagement groove to be engaged with the protrusion is formed.

  Further, in the present invention, the valve body forms a cam surface on the front surface thereof, forms a cam surface on the rear surface of the inner projecting wall at the center of the receiving body, and the cam surface on the front surface of the valve body on the rear cam surface. It is preferable that the engagement between the engaging portion of the guide piston body and the engaging portion of the valve body is released by the contact of the surfaces.

  In the present invention, it is preferable that a spring member for urging the guide piston body forward and a spring member for urging the valve body rearward are provided in the receiving space of the receiving body. is there.

  In the present invention, it is preferable that the flexible ink tank is removable from the ink supply mechanism and can be replaced.

  In the present invention, the ink in the ink tank preferably contains a volatile solvent having a high vapor pressure.

  According to the writing instrument of the present invention, since the writing instrument has an ink supply mechanism in which a pen core is attached to the front end side and an ink tank that is flexible with ink consumption is attached to the rear end side, Since the tank is deformed, there is no need for air replacement.

  The ink supply mechanism is configured to temporarily store the ink flowing in from the ink tank and to send the ink in the storage space only to the pen core side by restricting the ink in the storage space from returning to the ink tank. A guide piston body that moves back and forth with the pen core, provided with a valve body in a cylindrical housing shaft, a communication passage through which ink flows in the front pen core on the inner periphery and a piston structure on the outer periphery A front portion of the guide piston body whose movement in the rotational direction is restricted and the piston structure slidingly contacts the inner peripheral surface; a central portion where the valve body abuts against the rear surface of the inner protruding wall and restricts its forward movement; and an ink tank A rear part in which a communication hole communicating with the inside is formed, and a receiving body whose inside is a housing space, and a contact hole that is in contact with and separated from the opening of the communication hole of the receiving body to close and open the communication port With a disc The ink in the storage space is supplied to the pen core by moving the pen core to the rear end side, while the ink in the ink tank is transferred to the front end side from the rear end side by moving the pen core toward the front end side. The ink in the ink tank can be sent to the pen core and used for writing by operating the ink supply mechanism.

  The guide piston body and the valve body are respectively provided with engaging portions that engage with each other when the guide piston body moves to the rear end side, and when the guide piston body and the valve body move from the rear end side to the front end side, Since the valve body comes into contact with the inner projecting wall of the part and the engagement parts are disengaged, the operation of the pen core moves the guide piston body to engage the valve body. The valve body can be operated. Therefore, the guide piston body, the valve body, and the like can be simply configured to operate the valve body.

  When the ink supply mechanism is not in use, the valve body closes the communication hole at the rear of the receiving body, and when in use, the guide piston body moves to the rear end side as the pen core moves to the rear end side. By doing so, the ink in the accommodation space flows through the communication path to the pen core, the valve body engages with the guide piston body, and closes the communication path of the guide piston body, and then the pen core is moved to the front end side. When the guide piston body and the valve body are both moved to the front end side, the ink flows from the ink tank into the housing space, and the pen core returns to the front end side. By contacting the inner projecting wall at the center, the valve element moves backward and the communication hole at the rear of the receiver is closed. To prevent ink leakage, Can Komu feeding ink to ensure that the pen core is in use.

  The engaging portion of the guide piston body is formed with an engaging projection on the inner periphery of the rear portion thereof, extends forward to the valve body to form a rod portion, and is engaged with the projection as an engaging portion at the front portion of the rod portion. If a mating engagement groove is formed, the engagement portion has a simple configuration and is easy to mold.

  The valve body is formed with a cam surface on the front surface, a cam surface is formed on the rear surface of the inner projecting wall at the center of the receiving body, and the cam surface on the front surface of the valve body is in contact with the cam surface on the rear surface. Thus, the engagement between the engagement portion of the guide piston body and the engagement portion of the valve body can be released.

  In addition, a pen member is reliably provided by providing a spring member for urging the guide piston body forward and a spring member for urging the valve body rearward in the accommodating space of the receptacle. The communication hole that urges the valve body forward and urges the valve body rearward can be closed.

  Also, the flexible ink tank can be removed from the ink supply mechanism and replaced, so that the discarded rubber does not include the ink supply mechanism, and the disposal process can be performed conveniently.

  Also, the ink in the ink tank can contain a volatile solvent having a high vapor pressure. Even if the ink contains a volatile solvent, it is a flexible ink tank, so the volume of the ink tank decreases as the ink decreases, and there is no space in the ink tank, so the ink volatilizes. Therefore, even when stored for a long period of time, the ink tank is difficult to swell with the volatile gas of the solvent and can be stored easily.

It is a general view of the writing instrument which concerns on embodiment of this invention, Comprising: (a) is at the time of cap mounting, (b) is at the time of cap non-mounting. In the writing instrument of FIG. 1, it is explanatory drawing of the ink supply mechanism which provided the pen core, Comprising: (a) is a front perspective view, (b) is a front view, (c) is a side view, (d) is a longitudinal cross-section. (E) is a rear perspective view, and (f) is a rear view. In the writing instrument of FIG. 1, it is explanatory drawing of a guide piston body, (a) is a front perspective view, (b) is a front view, (c) is a longitudinal cross-sectional view, (d) is a side view, (e) Is a longitudinal sectional view at a position rotated by 90 ° from (c), (f) is a rear perspective view, and (g) is a rear view. In the writing instrument of FIG. 1, it is explanatory drawing of a receiving body, Comprising: (a) is a front perspective view, (b) is a front view, (c) is a front perspective view of another angle with (a), (d) is. (E) is a side view, (f) is a longitudinal sectional view at a different angle from (d), (g) is a rear perspective view, (h) is a rear view, and (i) is (g). It is a front perspective view of another angle. In the writing instrument of FIG. 1, it is explanatory drawing of a valve body, Comprising: (a) is a front perspective view, (b) is a front view, (c) is a side view, (d) is rotated 90 degrees from (c). (E) is a rear perspective view, and (f) is a rear view. In the writing instrument of FIG. 1, it is explanatory drawing of an ink tank, Comprising: (a) is a side view, (b) is a longitudinal cross-sectional view. (A) to (d) in the operation of the ink supply mechanism of FIG. 2, the guide piston body is engaged with the valve body when the guide piston body is moved backward by pressing the pen core. It is an operation explanatory view. (A) to (d) in the operation of the ink supply mechanism in FIG. 2, after the pen core is pressed, the guide piston body disengages the valve body when the guide piston body moves forward. It is operation | movement explanatory drawing until.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an overall view of a writing instrument according to an embodiment of the present invention, where (a) is when the cap is mounted, and (b) is when the cap is not mounted. 2A to 2F are explanatory diagrams of an ink supply mechanism provided with a pen core in the writing instrument of FIG. (A)-(g) of FIG. 3 is explanatory drawing of a guide piston body in the writing instrument of FIG. 4 (a) to 4 (i) are explanatory views of a receiver in the writing instrument of FIG. (A)-(f) of FIG. 5 is explanatory drawing of a valve body in the writing instrument of FIG. FIGS. 6A and 6B are explanatory diagrams of the ink tank and the rear shaft that accommodates it in the writing instrument of FIG. FIGS. 7A to 7D show the operation of the ink supply mechanism until the guide piston body engages with the valve body when the pen piston is pressed and the guide piston body moves rearward. 8 (a) to 8 (d) show the operation of the ink supply mechanism. Following FIG. 7, when the guide piston body moves forward after pressing the pen core, It is operation | movement explanatory drawing until a guide piston body cancels | releases engagement of a valve body.

  FIG. 1 is an overall view of a writing instrument according to an embodiment of the present invention, where (a) is when the cap is mounted, and (b) is when the cap is not mounted.

  As shown in FIG. 1, the writing instrument according to the embodiment is a writing instrument having an ink supply mechanism 14 in which a pen core 10 is attached to the front end side and an ink tank 12 that is flexible as ink is consumed is attached to the rear end side. is there. When not in use, as shown in FIG. 1 (a), the cap 8 covers the pen core 10 and is fitted in front of the joint 28 and the receiving shaft 20. When in use, the cap 8 is attached as shown in FIG. 1 (b). Remove the pen core 10 to expose. This writing instrument is a writing instrument that supplies ink in the ink tank 12 to the pen core 10 by pressing the pen core 10 against an object.

  2 is an explanatory view of an ink supply mechanism provided with a pen core in the writing instrument of FIG. 1, wherein (a) is a front perspective view, (b) is a front view, (c) is a side view, and (d). ) Is a longitudinal sectional view, (e) is a rear perspective view, and (f) is a rear view.

  As shown in FIG. 2, the ink supply mechanism 14 regulates the storage space 16 that temporarily stores the ink flowing from the ink tank 12 and the ink in the storage space 16 from returning into the ink tank 12. A valve body 18 for sending only to the pen core 10 side is provided in a cylindrical housing shaft 20, and the pen core 10 is moved to the rear end side to move the pen space 10 in the housing space 16. Ink is supplied to the pen core 10, while the ink in the ink tank 12 is moved into the accommodation space 16 by moving the pen core 10 from the rear end side toward the front end side.

  As shown in FIG. 2, the ink supply mechanism 14 mainly includes a guide piston body 22, a receiving body 24, a valve body 18, and a spring member 26 (a first spring member 40 and a second spring member 42). ) Is provided in the housing shaft 20. The details of each component are as follows.

  3 is an explanatory view of a guide piston body in the writing instrument of FIG. 1, wherein (a) is a front perspective view, (b) is a front view, (c) is a longitudinal sectional view, and (d) is a side view. (E) is a longitudinal sectional view at a position rotated by 90 ° from (c), (f) is a rear perspective view, and (g) is a rear view.

  As shown in FIGS. 2 and 3, the accommodating shaft 20 is formed with a wall portion 20a having a hole through which the guide piston body 22 is inserted so that the guide piston body 22 can be moved back and forth, and the front portion 20b having a smaller diameter than the rear portion 20c. It is a shaft.

  The receiving shaft 20 is fitted with a rear portion of the joint 28 in the front portion 20b with the wall portion 20a interposed therebetween, and a receiving body 24 is mounted in the rear portion 20c. The pen core 10 is inserted through the inner peripheral portion from the front portion to the rear portion of the joint 28, and the tip 10a of the pen core 10 protrudes forward from the opening of the joint 28 and is exposed. An insertion portion 10b having a smaller diameter than the front portion is formed at the rear portion of the pen core 10, and the insertion portion 10b is inserted into the front end portion of the guide piston body 22. In the joint 28, a porous body (sponge body or the like) 30 that is a temporary ink retaining body is accommodated in a cylindrical shape from the rear portion of the pen core 10 to the outer periphery of the front end portion of the guide piston body 22. Yes. Since the ink is temporarily stored in the ink supply mechanism 14 by the porous body 30, the ink that flows through the guide piston body 22 toward the pen core 10 can be temporarily stored in the porous body 30 even if the ink is intermittent. Can be supplied to the pen core.

  As shown in FIGS. 2 to 3, the guide piston body 22 has a cylindrical main body 22 a having a hollow communication passage through which the ink is circulated to the front pen core (the insertion portion 10 b of the pen core 10) on the inner peripheral portion. It moves back and forth with the pen core 10 provided with a wall-like piston structure 22b on the outer periphery. An engagement protrusion 22c is formed on the rear inner peripheral portion so as to protrude inward. A plurality of notches 22d are formed in a concave shape at equal intervals on the outer peripheral edge of the circular wall-shaped piston structure 22b.

  FIG. 4 is an explanatory view of the receiving body in the writing instrument of FIG. 1, wherein (a) is a front perspective view, (b) is a front view, and (c) is a front perspective view at a different angle from (a). (D) is a longitudinal sectional view, (e) is a side view, (f) is a longitudinal sectional view at an angle different from (d), (g) is a rear perspective view, (h) is a rear view, and (i) is a rear view. It is a front perspective view of another angle with (g).

  As shown in FIGS. 2 and 4, the receiving body 24 is configured such that the guide piston body 22 is restricted from moving in the rotational direction and the piston structure 22 b is in sliding contact with the inner peripheral surface, and the valve body 18 protrudes inward. A central portion that abuts against the rear surface of the wall 32 and restricts the forward movement of the wall 32 and a rear portion 24b in which a communication hole 24c communicating with the inside of the ink tank 12 is formed open. Is.

  In the front portion 24a of the receiving body 24, the structure that restricts the movement of the guide piston body 22 in the rotational direction is such that a spline-like mountain-shaped protrusion 24d protruding inwardly on the inner peripheral surface of the front portion 24a is formed in the axial direction. The projections 24d are formed so as to be inserted into the notches 22d of the guide piston body 22 and engaged with each other.

  Further, the rear portion 24b of the receiver 24 is formed in a substantially hollow bowl shape formed separately from the front portion and the central portion of the receiver 24 so as to be fitted into the rear opening from the inner projecting wall 32 of the receiver 24. Is present. In the rear portion 24b, the rear side is reduced in a stepped shape to form a seat surface 24e with which the valve body 18 (the main body 18a) abuts, and the rear side of the reduced diameter portion is further reduced in diameter and tubular. This is an insertion tube portion 34 extending in the direction. A communication hole 24c of the insertion tube portion 34 of the rear portion 24b is opened near the seating surface 24e, and the communication hole 24c communicates with the ink tank 12 attached to the insertion tube portion 34. The insertion tube portion 34 is inserted into the tip of the ink tank 12 so that the inside of the ink tank 12 communicates with the storage space portion 16 via the seating surface 24e.

  The space between the inner projecting wall 32 and the seating surface 24e of the rear portion 24b is a moving space 36 of the main body 18a of the valve body 18.

  FIG. 5 is an explanatory view of a valve body in the writing instrument of FIG. 1, wherein (a) is a front perspective view, (b) is a front view, (c) is a side view, and (d) is from (c). The side view of the position rotated 90 degrees, (e) is a rear perspective view, (f) is a rear view.

  As shown in detail in FIGS. 2 and 5, the valve body 18 is configured such that the main body 18 a having a constricted conical side shape is in contact with and detached from the seating surface 24 e which is the opening of the communication hole 24 c of the receiving body 24. Then, the communication hole 24c is closed and opened. The state in which the communication hole 24c is closed and opened by the movement of the valve body 18 will be described later with reference to FIGS.

  The guide piston body 22 and the valve body 18 are respectively provided with engaging portions for engaging the guide piston body 22 and the valve body 18 with each other when the guide piston body 22 moves to the rear end side. When the main body 18a of the body 18 moves from the rear end side to the front end side in the moving space 36, the main body 18a of the valve body 18 comes into contact with the inner projecting wall 32 at the center of the receiving body 24, and the respective engagements. The engagement between the joint portions is disengaged.

  Specifically, the engaging portion of the guide piston body 22 is formed by forming an engaging protrusion 22c on the inner periphery of the rear portion of the cylindrical main body 22a. The valve body 18 is formed with a rod portion 18b extending forward from the center of the front surface of the main body 18a, and is engaged with the engagement protrusion 22c as an engagement portion at a step-shaped narrow front portion of the rod portion 18b. The engaging groove 18c is formed. The rod portion 18b of the valve body 18 is inserted into the guide piston body 22 cylindrical main body 22a, and a gap is set between the outer peripheral surface of the rod portion 18b and the inner peripheral surface of the cylindrical main body 22a. Ink can flow through the communication path inside the cylindrical main body 22a. Further, the rod portion 18b of the valve body 18 has a central portion whose diameter is expanded rearward, the rod portion 18b is inserted into the cylindrical main body 22a, and the engagement protrusion 22c is located at the back of the engagement groove 18c. In the engaged state, the rear portion of the cylindrical main body 22a is closed by the diameter-expanded portion of the rod portion 18b so that the communication path can be closed.

  As shown in FIG. 5, the engagement groove 18c of the valve body 18 rod portion 18b draws a slight spiral from the front end on the circumferential surface of the rod portion 18b and surrounds at the back (the engagement groove 18c rear end portion). The valve element 18 is engaged with the guide piston body 22 by fitting the engagement protrusion 22c into the back of the engagement groove 18c. Become. Corresponding to the pair of engaging protrusions 22c, the engaging grooves 18c are formed in pairs at two locations in the circumferential direction.

4 to 5, the main body 18a of the valve body 18 is formed with a cam surface 38 having a wedge-like slope on the front surface thereof, while the rear surface of the inner projecting wall 32 at the center of the receiving body 24 is formed. A cam surface 32a having a wedge-shaped slope is formed on the surface. When the cam surface 38 on the front surface of the valve body 18 comes into contact with the cam surface 32a on the rear surface, the valve body 18 rotates in the anti-engagement direction, and the engagement groove 18c that is an engagement portion of the valve body 18 is obtained. The engagement of the engagement protrusion 22c, which is the engagement portion of the guide piston body 22 that has been fitted in, is released. In addition, as for the material of the accommodating shaft 20, the receiving body 24, the guide piston body 22, and the valve body 18, all are molding resin, such as a polypropylene and polyethylene. In addition, the valve body 18 can improve liquid-tightness by using an elastomer, silicone rubber, or the like at a contact portion with the received 24.
The spring member 26 housed in the housing space 16 of the receiving body 24 includes a first spring member 40 that urges the guide piston body 22 forward and a valve body 18 rearward. There is a second spring member 42 that biases toward the end. The first spring member 40 is accommodated such that the front end is in contact with the rear surface side of the guide piston body 22 and the rear end is in contact with the front surface of the inner projecting wall 32. The second spring member 42 may be appropriately fixed to the inner protruding wall 32 when formed separately.

  The first spring member 40 and the second spring member 42 are coil springs in which a stainless material or the like is wound in a coil shape, and the first spring member 40 and the second spring member 42 are continuously formed. May also be formed independently. At least one of the first spring member 40 and the second spring member 42 can be made of a resin material. Moreover, the 1st spring member 40 and the 2nd spring member 42 may be comprised by one.

  6A and 6B are explanatory diagrams of the ink tank in the writing instrument of FIG. 1, in which FIG. 6A is a side view and FIG. 6B is a longitudinal sectional view.

  The flexible ink tank 12 can be removed from the ink supply mechanism 14 and replaced. Specifically, as shown in FIG. 6, a flexible ink tank main body 12b is accommodated in a rigid exterior shaft 12a that has no problem when writing on the exterior. The ink tank main body 12b is a material that is not affected by deterioration due to the properties of the ink contained therein, and various materials can be used as long as they are flexible. For example, a bag body in which linear low density polyethylene (LLDPE) is used as a base material and the periphery is bonded with polyethylene terephthalate (PET) is used. Furthermore, it is preferable to form an aluminum vapor deposition layer between the LLDPE layer and the PET layer, since the suppression of volatilization of the ink content liquid and gas outflow can be improved.

  The supply port (spout) 12c attached to the ink tank main body 12b may be configured so that the ink of the content liquid does not flow out when the insertion tube portion 34 which is a connection port of the ink supply mechanism 14 is inserted and attached. In particular, the material and configuration are not limited, and various configurations can be taken. In the case of FIG. 6, an elastic rubber or elastomer insertion wall is provided in the frame of the supply port 12c, and an insertion tube portion 34 is inserted into the insertion wall to supply ink in the ink tank main body 12b to the ink supply mechanism 14. It is supposed to be sent to.

  The ink stored in the ink tank 12 contains a volatile solvent having a high vapor pressure. The composition of the ink stored in the ink tank is, for example, ethanol, methanol, acetone, methyl ethyl ketone, ethyl acetate, methyl acetate, propyl acetate, butyl acetate, hexane, isohexane, methylcyclohexane, toluene, xylene, dichloromethane, trichloroethylene, diethyl ether Alternatively, ink containing a plurality of volatile solvent can be accommodated.

  Hereinafter, the operation of the ink supply mechanism 14 will be described.

  7 (a) to 7 (d), when the ink supply mechanism of FIG. 2 is operated, the guide piston body engages with the valve body when the guide piston body is moved backward by pressing the pen core. It is operation | movement explanatory drawing until. FIGS. 8A to 8D show the operation of the ink supply mechanism of FIG. 2 in which the guide piston body is the valve body when the guide piston body moves forward after the pen core is pressed. It is operation | movement explanatory drawing until engagement is cancelled | released.

  As shown in FIG. 7A, the ink supply mechanism 14 closes the communication hole in the rear portion of the receiving body 24 by the valve body 18 when not in use. (A) corresponds to the front end limit position of the pen core 10 and the guide piston body 22.

  On the other hand, at the time of use, as shown in FIGS. 7B to 7D, the pen core 10 is moved to the rear end side by pressing the front end of the pen core 10 against the writing target portion and moving the writing instrument to the front end. The pen core 10 pressing force can be adjusted by the spring force of the spring member 26. Since the guide piston body 22 moves to the rear end side in accordance with the movement toward the rear end side of the pen core 10, the ink in the storage space portion 16 is pressed by the piston structure 22 b of the guide piston body 22. Ink passes through the gap between the rod portion 18b of the valve body 18 and the guide piston body 22 and the cylindrical main body 22a, and the ink flows through the communication path inside the cylindrical main body 22a to the pen core 10.

  As the guide piston body 22 moves to the rear end side, the engagement protrusion 22c in the cylindrical main body 22a slides on the engagement groove 18c of the valve body 18, as shown in FIG. 7 (d). The guide piston body 22 engages with the valve body 18 by engaging with the bent portion of the rear end of the engagement groove 18c. The central portion of the rod 18b of the valve body 18 has an enlarged diameter so as to expand rearward, the rod 18b is inserted into the cylindrical main body 22a, and the engagement protrusion 22c is engaged with the back of the engagement groove 18c. In the combined state, the opening of the communication passage at the rear portion of the cylindrical main body 22a is closed by the enlarged portion of the rod portion 18b, and the communication passage is closed.

  On the other hand, as shown in FIGS. 8A to 8D, as the pen core 10 returns to the front end side due to the elastic force of the spring member 26 when the pressure on the pen core 10 is stopped, the guide piston body 22 and Both valve bodies 18 move to the front end side. As described above, when the valve rod body 18 is engaged with the guide piston body 22, the rear portion of the cylindrical main body 22 a is closed by the enlarged diameter portion of the rod portion 18 b, and the guide piston body 22 and the front end side of the valve body 18 are moved. As a result of this movement, the piston structure 22 b of the guide piston body 22 creates a negative pressure in the storage space 16, so that ink flows from the ink tank 12 into the storage space 16.

  When the pen core 10 finally returns to the front end side by the movement of the valve body 18 toward the front end side, the valve body 18 protrudes inward of the central portion of the receiving body 24 as shown in FIG. Contact the wall 32. At this time, the cam surface 32a of the inner projecting wall 32 and the cam surface 38 on the front surface of the valve body 18 come into contact with each other, the valve body 18 rotates, and the engagement protrusion 22c in the cylindrical main body 22a becomes the valve body. 18 is disengaged from the engagement groove 18c. The valve body 18 moves rearward due to the elastic force of the second spring member 42 to return to a non-use state (the state shown in FIG. 7A) in which the communication hole 24c of the receiver rear portion 24b is closed.

  As described above, according to the writing instrument of the embodiment, the writing instrument has the ink supply mechanism 14 in which the pen core 10 is attached to the front end side and the ink tank 12 that is flexible as ink is consumed is attached to the rear end side. Therefore, since the ink tank 12 is deformed according to the ink consumption, there is no need for air replacement.

  The ink supply mechanism 14 restricts the storage space 16 that temporarily stores the ink flowing from the ink tank 12 and the return of the ink in the storage space 16 into the ink tank 12 to the pen core 10 side. A valve body 18 for sending only the ink is provided in the cylindrical accommodation shaft 20, and the ink in the accommodation space 16 is moved to the pen core 10 by moving the pen core 10 to the rear end side. On the other hand, the ink in the ink tank 12 is moved into the accommodation space 16 by moving the pen core 10 from the rear end side toward the front end side. The ink in the ink tank 12 can be sent to the pen core 10 for writing.

  The guide piston body 22 and the valve body 18 are respectively provided with engaging portions that engage with each other when the guide piston body 22 moves to the rear end side, and when the guide piston body 22 moves from the rear end side to the front end side, Since the valve body 18 comes into contact with the inner projecting wall 32 at the center of the body 24 and the engagement portions are disengaged, the guide piston body 22 is moved by the operation of the pen core 10. Since the valve body 18 is operated by engaging the valve body 18, the valve body 18 can be operated with a simple configuration such as the guide piston body 22 and the valve body 18.

  The ink supply mechanism 14 closes the communication hole 24c in the rear portion of the receiving body 24 by the valve body 18 when not in use, and on the other hand, the guide piston body 22 is moved as the pen core 10 is moved to the rear end side in use. As the ink moves to the rear end side, the ink in the accommodation space flows through the communication path to the pen core 10, and the guide piston body 22 engages with the valve body 18, and then the pen core 10 is moved to the front end side. When the guide piston body 22 and the valve body 18 are both moved to the front end side and the pen core 10 has completely returned to the front end side, the valve body 18 is placed on the inner projecting wall 32 at the center of the receiving body 24. By contact, the valve body 18 moves rearward to return to the state of non-use when the communication hole 24c at the rear of the receiving body 24 is closed. Therefore, the valve body 18 reliably closes the communication hole 24c when not in use. Ink leakage Comb, and it is a way to push feed reliably ink pen core 10 during use.

  The engaging portion of the guide piston body 22 is formed with an engaging protrusion 22c on the inner periphery of the rear portion thereof, extending forward on the valve body 18 to form a rod portion 18b, and an engaging portion on the front portion of the rod portion 18b. If the engagement groove 18c that engages with the projection is formed, the engagement portion has a simple configuration and is easy to mold.

  The valve body 18 has a cam surface 38 formed on the front surface of the main body 18a, a cam surface 32a formed on the rear surface of the inner projecting wall 32 at the center of the receiving body 24, and a valve body on the rear cam surface 32a. When the cam surface 38 on the front surface of 18 is brought into contact, the engagement between the engaging portion of the guide piston body 22 and the engaging portion of the valve body 18 can be released.

  Further, in the receiving space portion 16 of the receiving body 24, a first spring member 40 that biases the guide piston body 22 forward, and a second spring that biases the valve body 18 rearward. By providing the spring member 42, the pen core 10 can be reliably urged forward and the communication hole 24c urged rearward can be closed.

  In addition, the flexible ink tank 12 can be removed from the ink supply mechanism 14 and exchanged, so that the ink supply mechanism 14 is not included in the rubber to be discarded, and the disposal process can be performed conveniently.

  The ink in the ink tank 12 can contain a volatile solvent having a high vapor pressure. Even if the ink contains a volatile solvent, since the ink tank 12 is flexible, the inner volume of the ink tank 12 is reduced in accordance with the decrease of the ink, and no recessed space is formed. Therefore, the ink tank 12 does not easily swell with the volatile gas of the solvent even during long-term storage and can be stored easily.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible. For example, the ink tank 12 can have no exterior shaft unless rigidity is required.

  The writing instrument of the present invention can be used for various purposes such as board markers, industrial markers, etc., and the use of highly environmentally conscious users because there is little waste after writing. It can be used as a writing instrument that can improve the above benefits.

DESCRIPTION OF SYMBOLS 10 Pen core 10a Pen tip 10b Pen core insertion part 12 Ink tank 12a Ink tank exterior shaft 12b Ink tank body 12c Supply port 14 Ink supply mechanism 16 Storage space 18 Valve body 18a Valve body 18b Valve body Bar portion 18c Valve body engaging groove 20 Housing shaft 20a Wall portion 20b Front portion 20c Rear portion 22 Guide piston body 22a Tubular body 22b Piston structure 22c Engaging protrusion 24 Receiving body 24a Receiving body front portion 24b Receiving body rear portion 24c Receptor communication hole 24d Receiving peripheral protrusion 24e Bearing surface 26 Spring member 28 Joint 32 Inner protruding wall 32a Inner protruding wall rear surface cam surface 34 Insertion pipe portion 36 Moving space 38 Front surface of cam body 40 1 spring member 42 2nd spring member

Claims (6)

A writing instrument having an ink supply mechanism in which a pen core is attached to the front end side, and an ink tank that is flexible with ink consumption is attached to the rear end side,
An ink supply mechanism includes a storage space portion that temporarily stores ink that has flowed in from the ink tank, and a valve body that restricts the ink in the storage space portion from returning to the ink tank and sends the ink only to the pen core side. And a guide piston body that moves back and forth together with the pen core, and a guide structure that has a communication path for distributing ink to the front pen core in the inner peripheral portion and a piston structure in the outer peripheral portion, and a guide The piston body is restricted from moving in the rotational direction and the piston structure is in sliding contact with the inner peripheral surface, the valve body is in contact with the rear surface of the inner protruding wall and restricts forward movement, and the ink tank A receiving body comprising a rear portion in which a communicating hole is formed to be open, and the inside of which is an accommodation space portion, and the valve body that abuts and separates from the opening of the communicating hole of the receiving body to close and open the communicating port And
The guide piston body and the valve body are respectively provided with engaging portions that engage with each other when the guide piston body moves to the rear end side, and when the guide piston body and the valve body move from the rear end side to the front end side, The valve body is in contact with the inner projecting wall of the part so that the engagement between the engaging parts is disengaged,
When the ink supply mechanism is not in use, the valve body closes the communication hole in the rear part of the receiving body, and when in use, the guide piston body moves to the rear end side as the pen core moves to the rear end side. As a result, the ink in the housing space flows through the communication path to the pen core, the valve body engages with the guide piston body, and closes the communication path of the guide piston body, and then the pen core is moved to the front end side. When returning, both the guide piston body and the valve body move to the front end side, and when the ink circulates from the ink tank into the accommodation space and the pen core has returned to the front end side, the valve body is in the center of the receiving body. A writing instrument, wherein the valve body moves rearward by contacting the inner projecting wall of the portion and returns to a non-use state in which the communication hole at the rear of the receiving body is closed. The engaging portion of the guide piston body forms an engaging protrusion on the inner periphery of the rear portion,
2. The valve body according to claim 1, wherein the valve body extends forward to form a rod portion, and an engagement groove that engages with the protrusion as an engagement portion is formed at a front portion of the rod portion. Writing instruments.   The valve body is formed with a cam surface on the front surface, a cam surface is formed on the rear surface of the inner projecting wall at the center of the receiving body, and the cam surface on the front surface of the valve body is in contact with the cam surface on the rear surface. The writing instrument according to claim 2, wherein the engagement between the engaging portion of the guide piston body and the engaging portion of the valve body is released.   2. A spring member for urging the guide piston body forward and a spring member for urging the valve body rearward are provided in the receiving space of the receiving body. The writing instrument according to 1 of 3 above.   5. The writing instrument according to claim 1, wherein the flexible ink tank is removable from the ink supply mechanism and can be replaced.   The writing instrument according to any one of claims 1 to 5, wherein the ink in the ink tank contains a volatile solvent having a high vapor pressure.

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