Probe pen tip, pen core and electric drawing pen

Abstract

The present invention relates to the technical field of stationery, and discloses a probe pen tip, a pen core and an electric drawing brush, wherein a pen tip inner cavity is provided in the probe pen tip, an ink inlet end of the probe pen tip is provided with an ink inlet hole connected with the pen tip inner cavity; an ink outlet end of the probe pen tip is provided with a pen mouth connected with the pen tip inner cavity, the pen mouth comprises a guide groove and an ink outlet hole, the guide groove is located between the pen tip inner cavity and the ink outlet hole, and is respectively connected with the pen tip inner cavity and the ink outlet hole, an elastic member is installed in the pen tip inner cavity, and a stylus is fixedly provided at the movable end of the elastic member; a ball is eliminated at the pen mouth of the probe pen tip and replaced by a retractable stylus, so that normal dotting can be performed using special ink with high viscosity.

Description

Technical Field

[0001] The invention relates to the technical field of stationery products, in particular to a probe pen tip, a pen core and an electric drawing pen. Background Art

[0002] The existing gel pen tips on the market are usually ball-shaped. Figure 1 As shown, the upper end of the pen tip 200 is sleeved and fixed on one end of the pen core tube, and the pen mouth (i.e., the ink outlet) of the pen tip 200 is provided with a ball 210 and a support seat. The ball 210 can seal the ink in the pen core tube and also serve as a transfer medium. During the friction and rolling process between the ball 210 and the paper surface, the ball 210 transfers the ink adhered to its surface to the paper surface by rolling.

[0003] The nib 200 of the gel pen is mainly used for drawing lines and dots in the field of painting, so it is used as a main application accessory for point painting creation by an electric pointillist.

[0004] However, this ball structure is only suitable for neutral inks with lower viscosity. Due to the characteristics of this neutral ink, existing neutral pens are not suitable for some special material surfaces other than paper, such as smooth surfaces such as ceramics and metals. According to the survey results, in recent years, users of electric drawing pens have an increasingly strong demand for painting on ceramics and metal surfaces, and these special material surfaces require the use of high-viscosity special inks as pigments, such as ceramic inks and special inks for knitted fabrics. These high-viscosity special inks have poor fluidity, and these special inks take a very short time to dry. If a pen tip with the above ball structure is used, this ink will easily dry up and form ink blocks when it flows out of the pen mouth (or ink outlet), thereby causing the pen mouth to be blocked, resulting in the inability to draw normally.

[0005] Therefore, it is necessary to improve the traditional pen tip structure so that it can use high-viscosity special ink for normal stippling. Summary of the invention

[0006] The purpose of the present invention is to provide a probe pen tip, a pen core and an electric drawing pen to solve the above technical problems.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a probe pen tip, wherein a pen tip inner cavity is provided therein, an ink inlet end of the probe pen tip is provided with an ink inlet hole connected to the pen tip inner cavity; an ink outlet end of the probe pen tip is provided with a pen nozzle connected to the pen tip inner cavity;

[0009] The pen tip comprises a guide groove and an ink outlet hole; the guide groove is located between the inner cavity of the pen tip and the ink outlet hole, and is communicated with the inner cavity of the pen tip and the ink outlet hole respectively;

[0010] An elastic member is installed in the inner cavity of the pen tip, and a stylus is fixedly provided at the movable end of the elastic member; the elastic member is used to drive its movable end to extend into the guide groove to block the ink outlet hole; when the movable end of the elastic member blocks the ink outlet hole, the stylus extends out of the pen tip through the ink outlet hole;

[0011] Wherein, the movable end of the elastic member is an end of the elastic member away from the ink inlet hole.

[0012] Optionally, the elastic member is a spring;

[0013] The inner cavity of the pen tip is formed with a bell mouth at the junction with the ink inlet hole, which is used to limit the fixed end of the elastic member; the bell mouth is arranged around the ink inlet hole;

[0014] The fixed end of the elastic member abuts against the inner wall of the bell mouth;

[0015] Wherein, the fixed end of the elastic member is an end of the elastic member close to the ink inlet hole.

[0016] Optionally, the guide groove is a spherical crown-shaped arc groove; the guide groove and the inner cavity of the pen tip are integrally formed;

[0017] The movable end of the elastic member is integrally formed with the contact pin.

[0018] Optionally, the ink inlet and the ink outlet are both in the shape of circular holes; the contact pin is a cylindrical needle body, and the end of the contact pin away from the elastic member is in the shape of a spherical segment;

[0019] The diameter of the ink inlet hole is greater than the diameter of the ink outlet hole.

[0020] In a second aspect, the present invention further provides a pen core, comprising an ink tube and a probe pen tip fixed to the front end of the ink tube, wherein the ink inlet hole is connected to the ink storage cavity of the ink tube.

[0021] Optionally, the tail end of the ink tube is connected to an air inlet pipe, and the air inlet pipe is provided with an air inlet cavity communicated with the ink storage cavity;

[0022] The air intake pipe is provided with an inflatable part on the outer sleeve, and the inflatable part forms an elastic air bag on one side of the air intake port of the air intake pipe; a driving rod is inserted into the air intake pipe; one end of the driving rod extends out of the elastic air bag away from the side of the air intake pipe, and is provided with a pressing part for pressing the elastic air bag; the driving rod and the elastic air bag are surrounded to form an ear cavity connected with the air intake cavity; the other end of the driving rod extends into the air intake pipe, and is provided with a sealing member for blocking the air outlet port of the air intake pipe;

[0023] An air inlet hole is provided between the pressing portion and the elastic airbag, and the air inlet hole is connected to the ear cavity;

[0024] When the elastic airbag is not pressed, the seal blocks the air outlet port of the air inlet pipe; when the elastic airbag is pressed, the seal is separated from the air outlet port of the air inlet pipe, and the air inlet cavity is connected with the ink storage cavity.

[0025] Optionally, the sealing member is in a truncated cone shape; a truncated cone-shaped connecting pipe is formed at the tail end of the ink tube, and the connecting pipe is integrally formed with the air inlet pipe; there is a gap between the driving rod and the inner wall of the air inlet pipe;

[0026] The diameter of the pipe opening at one end of the connecting pipe close to the air inlet pipe is smaller than the diameter of the pipe opening at one end of the connecting pipe away from the air inlet pipe;

[0027] When the elastic airbag is not pressed, the outer wall of the sealing member contacts the inner wall of the connecting pipe.

[0028] Optionally, the pressing portion, the driving rod, the sealing member and the elastic airbag are integrally formed;

[0029] The pressing portion, the driving rod, the sealing element and the elastic airbag are made of elastic rubber or silicone material.

[0030] In a third aspect, the present invention provides an electric drawing brush, comprising a pen tube, wherein the pen core as described above is installed in the pen tube, and a magnetic attraction member is provided on the pressing portion, wherein the magnetic attraction member is a permanent magnet or an iron block; a driving device and a magnet mounting seat are also installed in the pen tube, and a pen core connecting magnet is installed on the magnet mounting seat; the pen core connecting magnet is magnetically attracted to the magnetic attraction member;

[0031] The driving end of the driving device is drivingly connected to the magnet mounting seat, and is used to drive the magnet mounting seat to perform reciprocating linear motion, thereby driving the pen core to perform reciprocating linear motion.

[0032] Optionally, the driving device is a miniature linear reciprocating motor, or the driving device includes a rotary motor and a conversion device connected to the rotating shaft of the rotary motor and used for driving the magnet mounting seat to reciprocate.

[0033] The beneficial effects of the present invention are as follows: the ball bearing at the tip of the probe pen is eliminated and replaced by a retractable stylus; when the stylus is not squeezed by external force, the elastic member will drive the stylus to extend out of the tip of the pen, and the ink with higher viscosity will naturally dry when in contact with the air to form a block, and the blocking barrier formed will prevent the ink from continuing to overflow, thereby achieving the blocking of the ink in the tube; when the stylus contacts the surface of paper or other objects, the stylus is squeezed and retracted into the tip of the pen by external force, which will damage the blocking barrier formed by the block, thereby releasing the ink; and when the ink flows through the dried block, the diluent inside the ink will also dissolve the dried ink block, which will further damage the blocking barrier and enable the ink to flow out smoothly, so as to achieve the purpose of ink discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 It is a schematic diagram of the structure of a gel pen tip in the prior art;

[0036] Figure 2 A schematic diagram of the structure of a pen core provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the structure of a probe tip provided by an embodiment of the present invention;

[0038] Figure 4 for Figure 2 A magnified schematic diagram of part B;

[0039] Figure 5 A schematic diagram of the structure of a probe pen tip provided by an embodiment of the present invention when its stylus is retracted into the pen mouth;

[0040] Figure 6 A schematic diagram of the structure of a probe pen tip provided by an embodiment of the present invention when its stylus extends out of the pen tip;

[0041] Figure 7 A schematic diagram of the structure of a pen core provided by an embodiment of the present invention when its elastic airbag is pressed.

[0042] In the figure:

[0043] 200, gel pen tip; 210, rollerball;

[0044] 10. Ink tube; 101. Ink storage chamber; 102. Air inlet chamber; 11. Ink; 12. Barrier layer; 13. Connecting pipe; 14. Air inlet pipe; 20. Probe pen tip; 201. Pen tip inner cavity; 2011. Ink inlet hole; 2012. Ink outlet hole; 202. Guide groove; 203. Bell mouth; 21. Contact pin; 22. Elastic part; 31. Air inlet component; 311. Pressing part; 32. Inflating part; 3201. Ear cavity; 321. Elastic airbag; 312. Driving rod; 313. Sealing part; 33. Air inlet hole; 34. Magnetic part; 40. Block. DETAILED DESCRIPTION

[0045] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] Please refer to Figure 2 , Figure 3 and Figure 4 , Figure 2 A schematic diagram of the structure of a pen core provided by an embodiment of the present invention, Figure 3 A schematic diagram of the structure of a probe tip provided by an embodiment of the present invention, Figure 4 for Figure 2 Schematic diagram of the enlarged portion B.

[0048] The embodiment of the present invention shows a pen core, which can better solve the problem of ink discharge of high viscosity ink. The pen core includes an ink tube 10 and a first end ( Figure 2 The probe pen tip 20 is disposed at the lower end of the ink tube 10.

[0049] Specifically, the probe tip 20 is provided with a tip inner cavity 201, and the ink inlet end ( Figure 3 The upper end of the probe tip 20 is provided with an ink inlet hole 2011 connected to the inner cavity 201 of the tip, and the ink inlet hole 2011 is connected to the ink storage cavity 101 of the ink tube 10; the ink outlet end ( Figure 3 The lower end of the probe pen tip 20 is provided with a pen mouth connected to the pen tip inner cavity 201; as shown in the figure, the ink storage cavity 101 of the ink tube 10 is used to store ink 11, and the upper surface of the ink 11 is provided with a barrier layer 12 for blocking air;

[0050] The pen tip includes a guide groove 202 and an ink outlet hole 2012; the guide groove 202 is located between the pen tip inner cavity 201 and the ink outlet hole 2012, and is connected to the pen tip inner cavity 201 and the ink outlet hole 2012 respectively;

[0051] An elastic member 22 is installed in the inner cavity 201 of the pen tip. The movable end ( Figure 3 A contact pin 21 is fixedly provided at the lower end of the middle elastic member 22;

[0052] When the stylus 21 is not squeezed by an external force, the elastic member 22 drives the stylus 21 to extend out of the pen tip from the ink outlet hole 2012. At this time, the movable end of the elastic member 22 abuts against the inner wall of the guide groove (202), thereby blocking or sealing the opening of the ink outlet hole 2012 located in the pen tip. Figure 3 The upper end of the ink outlet hole 2012 is open), and the elastic member 22 is in a naturally stretched state or a compressed state;

[0053] When the stylus 21 is squeezed and retracted into the pen tip by an external force, the elastic member 22 contracts, and the movable end of the elastic member 22 is separated from or partially separated from the guide groove 202 .

[0054] Please continue to refer to Figure 5 and Figure 6 , Figure 5 A schematic diagram of the structure of a probe pen tip 20 provided by an embodiment of the present invention when its stylus 21 is retracted into the pen tip, Figure 6 A schematic structural diagram of a probe pen tip 20 provided in an embodiment of the present invention when its stylus 21 extends out of the pen tip.

[0055] The probe pen tip 20 of the present embodiment eliminates the ball bearing at the nib and replaces it with a retractable stylus 21; when the stylus 21 extends out of the nib, the movable end of the elastic member 22 will block or seal the ink outlet 2012, and the ink with a high viscosity is easily dried naturally when in contact with the air to form a block 40, which is coated on the outer wall of the movable end and the outer wall of the stylus 21, forming a blocking barrier that can seal the nib, and the blocking barrier will prevent the ink from continuing to overflow, thereby sealing the ink 11 in the tube; when the stylus 21 contacts the surface of paper or other objects and is squeezed and retracted into the nib by external force, the formed blocking barrier will be damaged, and the nib will no longer be sealed, so that the ink can be released, and when the ink 11 in the tube flows through the dried block 40, the diluent inside the ink will also dissolve the dried block 40, further damaging the blocking barrier, so that the ink 11 can flow out smoothly, so as to achieve the purpose of ink discharge.

[0056] Specifically, the elastic member 22 is a spring;

[0057] like Figure 2 As shown, the inner cavity 201 of the pen tip is formed with a fixing end ( Figure 3 The upper end of the middle elastic member 22 is provided with a bell mouth 203 for limiting the position; the bell mouth 203 is narrow at the top and wide at the bottom, and is arranged around the ink inlet hole 2011;

[0058] The fixed end of the elastic member 22 abuts against the inner wall of the bell mouth 203 , so that the elastic member 22 is limited between the ink inlet hole 2011 and the ink outlet hole 2012 .

[0059] As an optional implementation, in this embodiment, the ink inlet hole 2011 and the ink outlet hole 2012 are both circular holes; the contact pin 21 is a cylindrical needle body, and the end of the contact pin 21 away from the elastic member 22 is spherical; the diameter of the ink inlet hole 2011 is greater than the diameter of the ink outlet hole 2012.

[0060] Specifically, the guide groove 202 is a circular arc groove in a spherical crown shape; the guide groove 202 and the pen tip inner cavity 201 are integrally formed; and the movable end of the elastic member 22 and the stylus 21 are integrally formed.

[0061] More specifically, Figure 3 As shown, the outer diameter of the movable end of the spring is smaller than the diameter of the arc groove and larger than the diameter of the ink outlet hole 2012, so that the movable end of the spring can extend into the guide groove 202 to block the ink outlet hole 2012. As a preferred embodiment, the end surface of the movable end of the spring ( Figure 3 The lower end surface of the middle spring can be designed as a gap-free surface, so that the movable end of the spring can better block the ink outlet hole 2012 to prevent the outflow of ink 11.

[0062] To ensure that the ink 11 can flow out of the pen tip smoothly when the stylus 21 is pressed, this embodiment adds an air intake component 31 to the pen core so that when the stylus 21 is retracted into the pen tip, the air intake component 31 injects air into the ink tube 10 to squeeze out the ink more smoothly.

[0063] Specifically, the tail end of the ink tube 10 ( Figure 2 The upper end of the ink tube 10 is connected to an air inlet pipe 14, and the air inlet pipe 14 is provided with an air inlet cavity 102 communicating with the ink storage cavity 101;

[0064] The air intake pipe 14 is provided with an air filling portion 32 on its outer cover. The air filling portion 32 is located at the air intake port ( Figure 4 An elastic airbag 321 is formed on one side of the upper end of the air intake pipe 14; a driving rod 312 is inserted into the air intake pipe 14; one end of the driving rod 312 extends out of the elastic airbag 321 away from the side of the air intake pipe 14 ( Figure 4The driving rod 312 and the elastic airbag 321 are arranged to form an ear cavity 3201 connected to the air inlet cavity 102; the other end of the driving rod 312 extends into the air inlet pipe 14, and is provided with an air outlet port ( Figure 4 A seal 313 at the lower port of the middle air intake pipe 14;

[0065] An air inlet hole 33 is provided between the pressing portion 311 and the elastic airbag 321 , and the air inlet hole 33 is connected to the ear cavity 3201 ;

[0066] When the elastic airbag 321 is not pressed, the seal 313 blocks the air outlet port of the air inlet pipe 14, and the air inlet cavity 102 is not connected to the ink storage cavity 101; when the elastic airbag 321 is pressed, the driving rod 312 drives the seal 313 to move toward the ink storage cavity 101, the air outlet port of the air inlet pipe 14 is no longer blocked, and the air inlet cavity 102 is connected to the ink storage cavity 101.

[0067] Please continue to refer to Figure 7 , Figure 7 A schematic diagram of the structure of a pen core provided by an embodiment of the present invention when its elastic airbag 321 is pressed.

[0068] In this embodiment, when the elastic airbag 321 is pressed, it will deform and produce two actions: one is to block the air inlet hole 33, and the other is to connect the air inlet cavity 102 with the ink storage cavity 101, and squeeze the air in the ear cavity 3201 and the air inlet cavity 102 into the ink storage cavity 101; when the pressing pressure of the elastic airbag 321 disappears, the elastic airbag 321 returns to its original state, and the air outlet port of the air inlet pipe 14 is blocked again, and at the same time, the air inlet hole 33 is opened to inhale external air.

[0069] Specifically, the sealing member 313 is truncated cone-shaped; a truncated cone-shaped connecting pipe 13 is formed at the tail end of the ink tube 10, and the connecting pipe 13 is integrally formed with the air inlet pipe 14; a gap needs to be left between the driving rod 312 and the inner wall of the air inlet pipe 14;

[0070] like Figure 4 As shown, the connecting pipe 13 is a pipe that is narrow at the top and wide at the bottom, and the diameter of the pipe opening at one end close to the air intake pipe 14 is smaller than the diameter of the pipe opening at the end away from the air intake pipe 14; when the elastic airbag 321 is not pressed, the outer wall of the sealing member 313 conflicts with the inner wall of the connecting pipe 13.

[0071] In this embodiment, the pressing portion 311, the driving rod 312, the sealing member 313 and the elastic airbag 321 are integrally formed;

[0072] The pressing portion 311 , the driving rod 312 , the sealing member 313 and the elastic airbag 321 are made of elastic rubber or silicone material.

[0073] This embodiment also discloses an electric drawing brush, including a pen tube, in which the above-mentioned pen core is installed, and a magnetic attraction member 34 is provided on the pressing portion 311, and the magnetic attraction member 34 is a permanent magnet or an iron block;

[0074] A driving device and a magnet mounting seat are also installed in the pen tube, and a pen core connecting magnet is installed on the magnet mounting seat; the pen core connecting magnet is magnetically attracted to the magnetic attraction member 34;

[0075] The driving end of the driving device is connected to the magnet mounting seat for driving the magnet mounting seat to perform reciprocating linear motion, thereby driving the pen core to perform reciprocating linear motion to achieve dot-stroke production. The driving device is a micro linear reciprocating motor, or the driving device includes a rotating motor and a conversion device connected to the rotating shaft of the rotating motor for driving the magnet mounting seat to perform reciprocating motion.

[0076] For ease of understanding, when the driving device of the electric drawing brush drives the pen core to make reciprocating linear motion, the pressing part 311 moves synchronously with the magnet mounting seat. When the pen tip touches the paper or other surface, a reaction force is generated. The reaction force is opposite to the force direction of the magnet mounting seat. At this time, the elastic airbag 321 is squeezed and deformed, sealing the air inlet 33, and pressing air into the ink storage cavity 101 to push the ink out of the pen tip; after the pen tip leaves the paper, the reaction force disappears, and the elastic airbag 321 recovers its deformation caused by the force due to its own elasticity, and the air inlet is reopened, so that the external air can be inhaled again; and this cycle repeats.

[0077] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0078] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pen core, comprising an ink tube and a probe pen tip fixed to the head end of the ink tube, characterized in that: The probe pen tip is provided with a pen tip inner cavity, the ink inlet end of the probe pen tip is provided with an ink inlet hole connected with the pen tip inner cavity, and the ink inlet hole is connected with the ink storage cavity of the ink tube; The tail end of the ink tube is connected with an air inlet pipe, and the air inlet pipe is provided with an air inlet cavity communicated with the ink storage cavity; The air intake pipe is provided with an inflatable part on the outer sleeve, and the inflatable part forms an elastic air bag on one side of the air intake port of the air intake pipe; a driving rod is inserted into the air intake pipe; one end of the driving rod extends out of the elastic air bag away from the side of the air intake pipe, and is provided with a pressing part for pressing the elastic air bag; the driving rod and the elastic air bag are surrounded to form an ear cavity connected with the air intake cavity; the other end of the driving rod extends into the air intake pipe, and is provided with a sealing member for blocking the air outlet port of the air intake pipe; An air inlet hole is provided between the pressing portion and the elastic airbag, and the air inlet hole is connected to the ear cavity; When the elastic airbag is not pressed, the sealing member blocks the air outlet port of the air inlet pipe; when the elastic airbag is pressed, the sealing member is separated from the air outlet port of the air inlet pipe, and the air inlet cavity is communicated with the ink storage cavity; The ink outlet end of the probe pen tip is provided with a pen nozzle connected to the inner cavity of the pen tip; The pen tip comprises a guide groove and an ink outlet hole; the guide groove is located between the inner cavity of the pen tip and the ink outlet hole, and is communicated with the inner cavity of the pen tip and the ink outlet hole respectively; An elastic member is installed in the inner cavity of the pen tip, and a stylus is fixedly provided at the movable end of the elastic member; the elastic member is used to drive its movable end to extend into the guide groove to block the ink outlet hole; when the movable end of the elastic member blocks the ink outlet hole, the stylus extends out of the pen tip through the ink outlet hole; Wherein, the movable end of the elastic member is an end of the elastic member away from the ink inlet hole.

2. The pen refill according to claim 1, characterized in that: The sealing member is in a truncated cone shape; a truncated cone-shaped connecting pipe is formed at the tail end of the ink tube, and the connecting pipe is integrally formed with the air inlet pipe; there is a gap between the driving rod and the inner wall of the air inlet pipe; The diameter of the pipe opening at one end of the connecting pipe close to the air inlet pipe is smaller than the diameter of the pipe opening at one end of the connecting pipe away from the air inlet pipe; When the elastic airbag is not pressed, the outer wall of the sealing member contacts the inner wall of the connecting pipe.

3. The pen refill according to claim 1, characterized in that: The pressing portion, the driving rod, the sealing member and the elastic airbag are integrally formed; The pressing portion, the driving rod, the sealing element and the elastic airbag are made of elastic rubber or silicone material.

4. The pen refill according to claim 1, characterized in that: The elastic member is a spring; The inner cavity of the pen tip is formed with a bell mouth at the junction with the ink inlet hole, which is used to limit the fixed end of the elastic member; the bell mouth is arranged around the ink inlet hole; The fixed end of the elastic member abuts against the inner wall of the bell mouth; Wherein, the fixed end of the elastic member is an end of the elastic member close to the ink inlet hole.

5. The pen refill according to claim 1, characterized in that: The guide groove is a circular arc groove in the shape of a spherical crown; the guide groove is integrally formed with the inner cavity of the pen tip; The movable end of the elastic member is integrally formed with the contact pin.

6. The pen refill according to claim 5, characterized in that: The ink inlet and the ink outlet are both in the shape of circular holes; the stylus is a cylindrical needle body, and the end of the stylus away from the elastic member is in the shape of a spherical segment; The diameter of the ink inlet hole is greater than the diameter of the ink outlet hole.

7. An electric drawing brush, comprising a pen tube, characterized in that: The pen tube is provided with a pen core as claimed in any one of claims 4 to 6, and the pressing part is provided with a magnetic attraction member, which is a permanent magnet or an iron block; The pen tube is also equipped with a driving device and a magnet mounting seat, and a pen core connecting magnet is installed on the magnet mounting seat; the pen core connecting magnet is magnetically attracted to the magnetic attraction member; The driving end of the driving device is drivingly connected to the magnet mounting seat, and is used to drive the magnet mounting seat to perform reciprocating linear motion, thereby driving the pen core to perform reciprocating linear motion; When the driving device of the electric drawing brush drives the pen core to perform reciprocating linear motion, the pressing part and the magnet mounting seat move synchronously. When the pen tip touches the paper or other object surface, a reaction force is generated, and the reaction force is opposite to the force direction of the magnet mounting seat. At this time, the elastic airbag is squeezed and deformed, sealing the air inlet, and pressing air into the ink storage cavity to push the ink out of the pen tip; after the pen tip leaves the paper, the reaction force disappears, and the elastic airbag recovers its deformation caused by the force due to its own elasticity, and the air inlet is reopened, so that the external air can be inhaled again.

8. The electric drawing brush according to claim 7, characterized in that: The driving device is a miniature linear reciprocating motor, or the driving device includes a rotary motor and a conversion device connected to the rotating shaft of the rotary motor for driving the magnet mounting seat to reciprocate.

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