A pen with a replaceable capsule that is convenient for replacing the pen capsule

Abstract

The present invention discloses a capsule-changing fountain pen that is convenient for replacing a pen capsule, comprising a pen barrel and a connector installed in the pen barrel, one end of the connector being fixedly connected to a pen head, and one end of the connector located in the pen barrel being clamped with an ink capsule; a limiting step is provided on the inner wall of the pen barrel, a through groove is provided on the inner wall of the pen barrel, the through groove passes through the open end of the pen barrel and the limiting step, and a clamping boss is fixedly connected on the outer wall of the connector, the clamping boss is used to pass through the through groove and then clamped on the limiting step, thereby clamping the connector in the pen barrel. The connector of the present invention is installed in the pen barrel by clamping, and can be pulled out by rotating a certain angle when disassembling, thereby facilitating the disassembly and replacement of the pen capsule; in the process of pulling the pen capsule out of the connector, the ink flow channel is blocked by a valve core ball, thereby preventing the ink remaining in the connector from being thrown out.

Description

Technical Field

[0001] The invention relates to the technical field of capsule-changing pens, and in particular to a capsule-changing pen which is convenient for replacing the pen capsule. Background Art

[0002] Fountain pens are commonly used writing tools, especially in business occasions. The nib of a fountain pen is made of metal, and it is smooth and elastic when writing, and it is quite fluent. According to the way of absorbing water, it is divided into dip pens, tap pens and ink sac pens. The removable sac fountain pen is a new type of ink sac fountain pen. Its ink sac is disposable. After the ink is used up, it can be continued to be used by replacing the ink sac. Replacing the ink sac can complete the work of absorbing water, thus avoiding the manual ink absorbing operation. Compared with traditional fountain pens, it is more convenient, taking into account the advantages of more beautiful writing with a metal nib and more convenient carrying of the whole set.

[0003] In the prior art, the tail of the pen head of the cartridge-changing fountain pen is connected to a connector, which is connected to the ink cartridge, which is connected to the pen holder through a thread, and the ink cartridge is located in the pen holder. When the ink cartridge needs to be replaced, the connector needs to be rotated first, the connector needs to be screwed off the pen holder, and then the ink cartridge on the connector needs to be plugged in and out, and after the new ink cartridge is pressed onto the connector, the connector and the pen holder need to be screwed in and out to complete the replacement of the ink cartridge. In this process, the connector is usually removed and tightened by a rotating connector, and there are many operation steps; in addition, in the process of plugging and unplugging the ink cartridge from the connector, the remaining ink in the connector is easily thrown out and spilled into the surrounding environment, or the process of replacing the ink cartridge is made unclean and not smooth. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a pen with a replaceable capsule which is convenient for replacing the pen capsule.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A changeable pen for conveniently replacing a pen capsule comprises a pen barrel and a connector installed in the pen barrel, wherein the pen barrel is a hollow member, an end of the connector located in the pen barrel is clamped with an ink capsule, an end of the connector away from the pen barrel is fixedly connected with a pen head for writing, and a pen tip is installed on the pen head; the characteristic is that a limiting step is provided on the inner wall of the pen barrel, a through groove is opened on the inner wall of the pen barrel, the through groove passes through the open end of the pen barrel and the limiting step, a clamping boss is fixedly connected to the outer wall of the connector, and the clamping boss is used to pass through the through groove and then clamped on the limiting step, so as to clamp the connector in the pen barrel.

[0007] Furthermore, the connecting piece is provided with a through hole for allowing ink to pass through, and a valve core ball is rotatably connected to the inner wall of the through hole, the diameter of the valve core ball is consistent with the diameter of the through hole, and one end of the valve core ball close to the inner wall of the through hole is fixedly connected to a rotating shaft, and a hinge hole is provided on the inner wall of the connecting piece, and the rotating shaft is rotatably connected in the hinge hole, and a first straight hole is provided in the middle of the valve core ball, and the first straight hole passes through the valve core ball, and when the first straight hole is in a first position parallel to the through hole, the cavities on both sides of the valve core ball in the through hole are unobstructed, so that the ink in the ink bag enters the connecting piece and then the ink flows to the pen tip; when the first straight hole is in a second position perpendicular to the through hole, the space on both sides of the valve core ball in the through hole is blocked by the valve core ball, so that the ink in the connecting piece is not easy to flow out from the end of the connecting piece away from the pen tip.

[0008] Furthermore, the outer wall of the connecting piece is provided with a stepped concave surface with a reduced diameter at one end away from the pen tip, the upper end of the rotating shaft passes through the side wall of the connecting piece and is fixedly connected to a rotating block, the rotating block is located in the stepped concave surface area, the rotating block is in the shape of an elongated strip, and one end of the rotating block is semicircular and the semicircular shape is concentric with the axis of the rotating shaft; a stepped convex surface is provided in the inner hole of one end of the ink sac for installation on the connecting piece, a rotating groove is provided on the stepped convex surface, the width of the rotating groove matches the width of the rotating block, the rotating groove is used to push the rotating block to rotate when installing the ink sac so that the rotating block is clamped in the rotating groove, thereby making the through hole located on both sides of the valve core ball pass through.

[0009] Furthermore, the end of the rotating groove is provided with a bell-shaped mouth expanding outwardly on both sides of the rotating groove, and the width of the open end of the bell-shaped mouth is greater than the length of the rotating block. When the ink sac is clamped in the connecting piece, the side wall of the bell-shaped mouth contacts the rotating block first and makes the rotating block rotate and clamp into the rotating groove under the guidance of the bell-shaped mouth.

[0010] Furthermore, a torsion spring is provided in the hinge hole, and the torsion spring is sleeved on the outside of the rotating shaft. One end of the torsion spring is fixed on the outer wall of the connecting piece, and the other end of the torsion spring is fixed on the rotating shaft. The torsion spring is used to drive the valve core ball to rotate when the step convex surface on the ink bag is separated from the step concave surface so that the first straight hole on the valve core ball is in a vertical state with the through hole, thereby blocking the ink in the through hole.

[0011] Furthermore, a sealing cylindrical surface is provided on the outer wall of the connecting piece away from the pen tip, and a sealing inner hole is opened on the end of the ink bag close to the connecting piece. When the ink bag is installed on the connecting piece, the sealing cylindrical surface is clamped in the sealing inner hole and the sealing cylindrical surface and the sealing inner hole are tightly and sealed.

[0012] Furthermore, an axial groove is provided on the end surface of the connecting piece, and the end of the ink bag is inserted into the axial groove.

[0013] Furthermore, a mounting cavity is provided on the inner wall of the axial groove, a clamping column is provided in the mounting cavity, a clamping groove is provided on the outer wall of the ink bag, the end of the clamping column extends into the clamping groove to clamp the ink bag, and a compression spring is provided in the mounting cavity, one end of the compression spring abuts against the side wall of the mounting cavity, and the other end of the compression spring abuts against the end of the clamping column away from the axial groove, thereby pushing the clamping column toward the axis of the connecting piece.

[0014] Furthermore, the contact surface between the clamping column and the clamping groove is hemispherical, so that the clamping is convenient and the ink bag can be pulled out with force.

[0015] Furthermore, a gripping sleeve is provided on the shaft of the pen holder, the gripping sleeve is made of soft rubber material, and the outer wall of the gripping sleeve is provided with a corrective concave arc surface for easy finger gripping.

[0016] Furthermore, a pen cap is sleeved on the end of the pen barrel.

[0017] The invention provides a capsule-changing fountain pen that is convenient for replacing a pen capsule, which has the following beneficial effects: a connecting piece is mounted in a pen holder by snap-fitting, and can be pulled out by rotating a certain angle when disassembling, thereby facilitating the disassembly and replacement of the pen capsule; in the process of pulling the pen capsule out of the connecting piece, a through hole in the connecting piece for ink to flow through a channel is blocked by a valve core ball, thereby preventing the ink remaining in the connecting piece from being thrown out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0019] Figure 1 A schematic cross-sectional structure diagram of a capsule-changing fountain pen for conveniently replacing a pen capsule provided by the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the capsule-changing fountain pen of the present invention with the pen cap, pen barrel and grip sleeve removed;

[0021] Figure 3 It is a schematic cross-sectional structural diagram of the pen holder in the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the pen holder in the present invention;

[0023] Figure 5 It is a side view structural schematic diagram of the pen holder in the present invention;

[0024] Figure 6 for Figure 1 Schematic diagram of the local structure of part A in the middle;

[0025] Figure 7 for Figure 6Schematic diagram of the local structure of the middle C part;

[0026] Figure 8 This is a bottom view of the cooperation between the rotating shaft and the rotating block in the present invention;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the valve core ball in the present invention;

[0028] Fig.10 It is a schematic diagram of a partial cross-sectional structure of the ink sac in the present invention;

[0029] Fig.11 for Figure 6 Schematic diagram of the local structure of the middle B part;

[0030] Fig.12 The present invention provides a schematic diagram of the three-dimensional structure of the capsule-changing fountain pen.

[0031] Explanation of the numbers in the figure: 1. Pen body; 11. Limiting step; 12. Through groove; 2. Connecting piece; 21. Snap-on boss; 22. Through hole; 23. Hinge hole; 24. Step concave surface; 25. Sealing cylindrical surface; 26. Axial groove; 27. Mounting cavity; 28. Snap-on column; 29. ​​Compression spring; 3. Pen head; 4. Pen tip; 5. Ink sac; 51. Step convex surface; 52. Rotating groove; 53. Bell mouth; 54. Sealing inner hole; 55. Snap-on groove; 6. Valve core ball; 61. Rotating shaft; 62. First straight hole; 63. Rotating block; 7. Torsion spring; 8. Gripping sleeve; 81. Correction concave arc surface; 9. Pen cap. Implementation

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0035] Figure 1 A schematic cross-sectional structure diagram of a capsule-changing fountain pen for conveniently replacing a pen capsule provided by the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the refillable pen of the present invention with the pen cap and pen holder removed and the grip sleeve removed.

[0036] like Figure 1 and Figure 2 As shown, a capsule-changing fountain pen for convenient replacement of pen capsules comprises a pen body 1 and a connecting member 2 installed at one end of the pen body 1, wherein the connecting member 2 is fixedly connected to an end away from the pen body 1 with a nib 3 for writing, and a pen tip 4 is installed on the nib 3.

[0037] Figure 3 It is a schematic cross-sectional structural diagram of the pen holder in the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the pen holder in the present invention; Figure 5 It is a schematic diagram of the side structure of the pen holder in the present invention.

[0038] Combination Figure 1-7 As shown, the pen barrel 1 is a hollow part, and the end of the connecting member 2 located in the pen barrel 1 is clamped with the ink bag 5. A limiting step 11 is provided on the inner wall of the pen barrel 1, and a through groove 12 is opened on the inner wall of the pen barrel 1. The through groove 12 passes through the open end of the pen barrel 1 and the limiting step 11. A clamping boss 21 is fixedly connected to the outer wall of the connecting member 2. The clamping boss 21 is used to pass through the through groove 12 and then clamped on the limiting step 11, so that the connecting member 2 is clamped in the pen barrel 1. The clamping boss 21 cooperates with the limiting step 11, so that the connecting member 2 is clamped on the pen barrel 1. When disassembling, the connecting member 2 can be pulled out by rotating a certain angle so that the clamping boss 21 and the through groove 12 are relatively aligned, so as to facilitate the disassembly and replacement of the pen bag.

[0039] Figure 6 for Figure 1 Schematic diagram of the local structure of part A in the middle; Figure 7 for Figure 6 Schematic diagram of the local structure of the middle C part; Figure 8 This is a bottom view of the cooperation between the rotating shaft and the rotating block in the present invention; Fig. 9 The above figures are used to mainly illustrate the ink flow path and principle.

[0040] In the present invention, a through hole 22 for allowing ink to pass through is opened in the connecting member 2, and a valve core ball 6 is rotatably connected to the inner wall of the through hole 22. The diameter of the valve core ball 6 is consistent with the diameter of the through hole 22, and one end of the valve core ball 6 close to the inner wall of the through hole 22 is fixedly connected with a rotating shaft 61. A hinge hole 23 is opened on the inner wall of the connecting member 2, and the rotating shaft 61 is rotatably connected in the hinge hole 23. A first straight hole 62 is opened in the middle of the valve core ball 6, and the first straight hole 62 passes through the valve core ball 6. When the first straight hole 62 is in a first position parallel to the through hole 22, the cavities on both sides of the valve core ball 6 in the through hole 22 are unobstructed, so that the ink in the ink bag 5 enters the connecting member 2 and then the ink flows to the pen tip 4; when the first straight hole 62 is in a second position perpendicular to the through hole 22, the space on both sides of the valve core ball 6 in the through hole 22 is blocked by the valve core ball 6, so that the ink in the connecting member 2 is not easy to flow out from the end of the connecting member 2 away from the pen tip 4. The valve core ball 6 blocks the ink when it is in the second position. In this state, the gap for ink to flow out is smaller, thereby preventing the ink in the connecting member 2 from being thrown out when the ink bag 5 is pulled out.

[0041] In the present invention, a stepped concave surface 24 with a reduced diameter is provided at one end of the outer wall of the connecting member 2 away from the pen tip 4, and the upper end of the rotating shaft 61 passes through the side wall of the connecting member 2 and is fixedly connected to a rotating block 63, and the rotating block 63 is located in the area of ​​the stepped concave surface 24, and the rotating block 63 is in the shape of an elongated strip, and one end of the rotating block 63 is semicircular and the semicircular shape is concentric with the axis of the rotating shaft 61.

[0042] Fig.10 It is a schematic diagram of the partial cross-sectional structure of the ink bag 5 in the present invention.

[0043] The inner hole of one end of the ink sac 5 installed on the connecting member 2 is provided with a stepped convex surface 51, and a rotating groove 52 arranged along the axial direction of the ink sac 5 is opened on the stepped convex surface 51. The width of the rotating groove 52 matches the width of the rotating block 63. The rotating groove 52 is used to push the rotating block 63 to rotate when the ink sac 5 is installed so that the rotating block 63 is engaged in the rotating groove 52, thereby making the through hole 22 located on both sides of the valve core ball 6 connected. When the ink sac 5 is installed on the connecting member 2, the ink sac 5 is pressed toward the connecting member 2. During the pressing process, the rotating groove 52 abuts against the rotating block 63, so that the rotating block 63 rotates and slides into the rotating groove 52 along the rotating groove 52, thereby driving the valve core ball 6 to rotate, so that both sides of the first straight hole 62 are unblocked, which is conducive to the ink flowing into the connecting member 2 and then the ink flowing to the pen tip 3.

[0044] In the present invention, the end of the rotating groove 52 is provided with a bell mouth 53 that expands outwards on both sides of the rotating groove 52, and the width of the open end of the bell mouth 53 is greater than the length of the rotating block 63. The bell mouth 53 is used for the side wall of the bell mouth 53 to contact the rotating block 63 first when the ink bag 5 is clamped in the connecting member 2, and the rotating block 63 is rotated and clamped into the rotating groove 52 under the guidance of the bell mouth 53. By providing the bell mouth 53, it is easier for the rotating block 63 to be clamped from the bell mouth 53 to the rotating groove 52 and rotate during the clamping process, so that it is easier to drive the valve core ball 6 to rotate.

[0045] In the present invention, a torsion spring 7 is provided in the hinge hole 23, and the torsion spring 7 is sleeved on the outside of the rotating shaft 61, one end of the torsion spring 7 is fixed on the outer wall of the connecting member 2, and the other end of the torsion spring 7 is fixed on the rotating shaft 61. The torsion spring 7 is used to drive the valve core ball 6 to rotate when the step convex surface 51 on the ink sac 5 is separated from the step concave surface 24, so that the first straight hole 62 on the valve core ball 6 is in a vertical state with the through hole 22, thereby blocking the ink in the through hole 22. During the process of pulling out the ink sac 5, after the step convex surface 51 is separated from the step concave surface 24, the rotating block 63 is separated from the rotating groove 52, and the torsion spring 7 drives the rotating shaft 61 to rotate, so that the valve core ball 6 rotates, so that the first straight hole 62 on the valve core ball 6 is in a vertical state with the through hole 22 to block the ink in the through hole 22, so that the ink in the connecting member 2 is not easily thrown out.

[0046] In the present invention, a sealing cylindrical surface 25 is provided on the outer wall of the end of the connector 2 away from the pen tip 4, and a sealing inner hole 54 is provided on the end of the ink bag 5 close to the connector 2. When the ink bag 5 is installed on the connector 2, the sealing cylindrical surface 25 is clamped in the sealing inner hole 54, and the sealing cylindrical surface 25 and the sealing inner hole 54 are in close sealing cooperation. Through the sealing cooperation, the ink will not overflow from the joint during normal use.

[0047] Fig.11 for Figure 6 Schematic diagram of the local structure of part B in the middle.

[0048] In the present invention, an axial groove 26 is provided on the end surface of the connector 2, and the end of the ink sac 5 is inserted into the axial groove 26. Thus, the end of the ink sac 5 is hidden in the axial groove 26, so that the end of the ink sac 5 is not easy to touch, and the ink sac 5 is not easy to fall off. A mounting cavity 27 is provided on the inner wall of the axial groove 26, and a clamping column 28 is provided in the mounting cavity 27. A clamping groove 55 is provided on the outer wall of the ink sac 5. The end of the clamping column 28 extends into the clamping groove 55 to clamp the ink sac 5. A compression spring 29 is provided in the mounting cavity 27, and one end of the compression spring 29 abuts against the side wall of the mounting cavity 27, and the other end of the compression spring 29 abuts against the end of the clamping column 28 away from the axial groove 26. The clamping column 28 is pushed out toward the axis of the connector 2 by the compression spring 29, so that the clamping column 28 is clamped in the clamping groove 55, and the ink sac 5 is firmly clamped. The contact surface between the clamping column 28 and the clamping groove 55 is hemispherical, so as to facilitate clamping and enable the ink bag 5 to be pulled out with force.

[0049] Fig.12 The present invention provides a schematic diagram of the three-dimensional structure of the capsule-changing fountain pen.

[0050] In the present invention, a gripping sleeve 8 is sleeved on the shaft of the pen holder 1, and the gripping sleeve 8 is made of soft rubber material, and a correction concave arc surface 81 is provided on the outer wall of the gripping sleeve 8 for easy finger gripping. When in use, the fingers grip the soft gripping sleeve 8, which is convenient for gripping the pen and makes the hand grip more comfortable; and the fingers grip the correction concave arc surface 81, thereby correcting the pen gripping posture, making it easier to grip the pen and write.

[0051] Specifically, in order to facilitate the protection of the pen tip 4, a pen cap 9 is clamped on the end of the pen body 1.

[0052] The present invention provides a changeable pen for conveniently replacing a pen capsule. When in use, the connecting member 2 is mounted in the pen holder 1 by snap connection, and can be pulled out by rotating a certain angle when disassembling, thereby facilitating the disassembly and replacement of the pen capsule. When the pen capsule is pulled out from the connecting member 2, after the step convex surface 51 is separated from the step concave surface 24, the rotating block 63 is separated from the rotating groove 52, and the torsion spring 7 drives the rotating shaft 61 to rotate, so that the valve core ball 6 rotates, so that the first straight hole 62 on the valve core ball 6 is in a vertical state with the through hole 22 to block the ink in the through hole 22, so that the ink in the connecting member 2 is not easily thrown out; when the ink capsule 5 is mounted on the connecting member 2, the ink capsule 5 is pressed toward the connecting member 2. During the pressing process, the rotating groove 52 abuts against the rotating block 63, so that the rotating block 63 rotates and slides into the rotating groove 52 along the rotating groove 52, thereby driving the valve core ball 6 to rotate, so that both sides of the first straight hole 62 are unblocked, which is conducive to the ink flowing into the connecting member 2 and then the ink flowing to the pen head 3 for writing.

[0053] The parts not involved in this technical solution can be implemented by using existing technologies.

[0054] The above shows and describes the basic principles, main features and characteristics of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A refillable fountain pen for conveniently replacing a pen capsule, comprising a pen barrel (1) and a connecting piece (2) mounted at one end of the pen barrel (1), wherein the pen barrel (1) is a hollow piece, and an ink capsule (5) is clamped at one end of the connecting piece (2) located inside the pen barrel (1); a nib (3) for writing is fixedly connected to one end of the connecting piece (2) away from the pen barrel (1), and a pen tip (4) is mounted on the nib (3), characterized in that: A limiting step (11) is provided on the inner wall of the pen holder (1); A through groove (12) is provided on the inner wall of the pen holder (1); The through groove (12) passes through the open end of the pen holder (1) and the limiting step (11); A clamping boss (21) is fixedly connected to the outer wall of the connecting piece (2); The clamping boss (21) is used to pass through the through slot (12) and then be clamped on the limiting step (11), thereby clamping the connecting member (2) in the pen holder (1); The connecting member (2) is provided with a through hole (22) for ink to pass through, and a valve core ball (6) is rotatably connected to the inner wall of the through hole (22); The diameter of the valve core ball (6) is consistent with the diameter of the through hole (22); one end of the valve core ball (6) close to the inner wall of the through hole (22) is fixedly connected to a rotating shaft (61); a hinge hole (23) is opened on the inner wall of the connecting member (2); and the rotating shaft (61) is rotatably connected in the hinge hole (23); A first straight hole (62) is formed in the middle of the valve core ball (6), and the first straight hole (62) passes through the valve core ball (6). When the first straight hole (62) is in a first position parallel to the through hole (22), the cavities on both sides of the valve core ball (6) in the through hole (22) are unobstructed, so that the ink in the ink bag (5) enters the connecting member (2) and then flows to the pen tip (4); When the first straight hole (62) is in a second position perpendicular to the through hole (22), the space on both sides of the valve core ball (6) in the through hole (22) is blocked by the valve core ball (6), so that the ink in the connecting member (2) is not easy to flow out from the end of the connecting member (2) away from the pen tip (4); An end of the outer wall of the connecting member (2) away from the pen tip (4) is provided with a stepped concave surface (24) with a reduced diameter; The upper end of the rotating shaft (61) passes through the side wall of the connecting member (2) and is fixedly connected to a rotating block (63), the rotating block (63) is located in the step concave surface (24) area, the rotating block (63) is in the shape of an elongated strip, and one end of the rotating block (63) is in the shape of a semicircle, and the semicircle is concentric with the axis of the rotating shaft (61); A stepped convex surface (51) is provided in an inner hole of one end of the ink bag (5) for mounting on the connecting member (2), a rotation groove (52) is provided on the stepped convex surface (51), and the width of the rotation groove (52) matches the width of the rotation block (63); The rotating groove (52) is used to push the rotating block (63) to rotate when the ink bag (5) is installed so that the rotating block (63) is clamped in the rotating groove (52), thereby allowing the through hole (22) to penetrate the areas on both sides of the valve core ball (6).

2. A pen with a replaceable capsule that is convenient to replace according to claim 1, characterized in that: The end of the rotating groove (52) is provided with a bell mouth (53) expanding outwardly toward both sides of the rotating groove (52), the width of the open end of the bell mouth (53) is greater than the length of the rotating block (63), and the bell mouth (53) is used for the side wall of the bell mouth (53) to contact the rotating block (63) first when the ink bag (5) is clamped in the connecting member (2), so that the rotating block (63) is rotated and clamped into the rotating groove (52) under the guidance of the bell mouth (53).

3. A pen with a replaceable capsule that is convenient to replace according to claim 2, characterized in that: A torsion spring (7) is provided in the hinge hole (23), the torsion spring (7) is sleeved on the outside of the rotating shaft (61), one end of the torsion spring (7) is fixed on the outer wall of the connecting member (2), and the other end of the torsion spring (7) is fixed on the rotating shaft (61); The torsion spring (7) is used to drive the valve core ball (6) to rotate when the step convex surface (51) on the ink bag (5) is separated from the step concave surface (24), so that the first straight hole (62) on the valve core ball (6) is in a vertical state with the through hole (22), thereby blocking the ink in the through hole (22).

4. The pen with a replaceable capsule according to claim 1, characterized in that: A sealing cylindrical surface (25) is provided on the outer wall of the end of the connecting member (2) away from the pen tip (4), and a sealing inner hole (54) is provided on the end of the ink bag (5) close to the connecting member (2); When the ink bag (5) is mounted on the connecting member (2), the sealing cylindrical surface (25) is engaged in the sealing inner hole (54), and the sealing cylindrical surface (25) and the sealing inner hole (54) are in close and sealing cooperation.

5. The pen with a replaceable capsule according to claim 1, characterized in that: An axial groove (26) is provided on the end surface of the connecting piece (2), and the end of the ink bag (5) is inserted into the axial groove (26).

6. The pen with a replaceable capsule according to claim 5, characterized in that: An installation cavity (27) is provided on the inner wall of the axial groove (26), and a clamping column (28) is provided in the installation cavity (27); A clamping groove (55) is provided on the outer wall of the ink bag (5), and the end of the clamping column (28) extends into the clamping groove (55) to clamp the ink bag (5); A compression spring (29) is arranged in the installation cavity (27), one end of the compression spring (29) abuts against the side wall of the installation cavity (27), and the other end of the compression spring (29) abuts against the end of the clamping column (28) away from the axial groove (26), thereby pushing the clamping column (28) toward the axis of the connecting member (2).

7. The pen with a replaceable capsule according to claim 6, characterized in that: The contact surface between the clamping column (28) and the clamping groove (55) is hemispherical.

8. The pen with a replaceable capsule according to claim 1, characterized in that: A gripping sleeve (8) is sleeved on the shaft of the pen holder (1), the gripping sleeve (8) is made of a soft rubber material, and a corrective concave arc surface (81) is provided on the outer wall of the gripping sleeve (8) for easy finger gripping.

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