Automatic eraser pen
By designing an automatic eraser pen and using a triangular eraser core and transmission system, the problem of difficulty in erasing details and lines is solved in ordinary eraser pens, achieving efficient and accurate painting effects.
Patent Information
- Application Number
- CN202421266186.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-04
AI Technical Summary
When students are painting, ordinary erasers are larger and thicker, making it difficult to accurately erase detailed lines, which can easily affect the clarity of other lines.
Design an automatic eraser pen, including a pen rod, an inner rod, an eraser core, a transmission member, a spring and a chuck. The cross-section of the eraser core is a triangular structure. By pressing the pen cap, the transmission member and push rod can be moved, the rubber core is output. Core and return position.
It realizes precisely erasing detailed lines without affecting the clarity of other lines, improving painting efficiency, simple structure and easy to use.
Smart Images
Figure CN222495922U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drawing auxiliary tools, in particular to an automatic eraser pen. Background Art
[0002] When students are drawing, they often need to use erasers to erase some lines. However, since ordinary erasers are large and thick, erasing detailed lines will affect the clarity of other lines and it is easy to erase parts that should not be erased, so that they have to redraw, which affects work efficiency.
[0003] Therefore, how to erase detail lines without affecting the clarity of other lines is a problem that urgently needs to be solved. Utility Model Content
[0004] The main purpose of the utility model is to provide an automatic eraser pen, aiming to solve the problem of how to erase detail lines without affecting the clarity of other lines.
[0005] To achieve the above-mentioned purpose, the utility model proposes an automatic eraser pen, which includes a pen barrel, an inner rod, a pen cap, a transmission member, a fixing member, a connecting member, a spring, a push rod, a chuck, a locking hoop, a core protection tube head and a rubber core. The inner rod is fixed in the pen barrel, and the rubber core is movably arranged in the inner rod, and the rubber core passes through the core protection tube head embedded in the front end of the inner rod; the transmission member is also arranged in the pen barrel, and the transmission member is detachably connected to the chuck in the inner rod, and one end of the chuck is provided with at least two elastic expansion clips that can be used to clamp the push rod, and the elastic expansion clip The outer wall of is sleeved in the locking hoop, the front end of the elastic expansion clip is provided with a boss capable of returning the locking hoop hook to its original position, and the inner rod is provided with a ring step for limiting the movement of the locking hoop; the outer sleeve of the transmission member is provided with the spring, the outer side of the spring is sleeved with the fixing member, and the fixing member is detachably connected to the inner rod; the transmission member is provided with the push rod, and the push rod is detachably connected to the rubber core in the inner rod, one end of the transmission member is embedded in the pen cap, and the pen cap and the pen barrel are connected by the connecting member; the cross-section of the rubber core is a triangular structure.
[0006] In one embodiment, a groove is provided on the outer wall of the fixing member, a first protrusion is provided on the inner wall of the inner rod, and the groove is detachably connected to the first protrusion.
[0007] In one embodiment, a first step is further provided on the inner wall of the inner rod, and the first step abuts against an end of the fixing member away from the transmission member.
[0008] In one embodiment, the push rod includes a sliding portion and a connecting portion connected to each other, the elastic expansion clip is used to clamp the sliding portion, and the rubber core is provided with a slot adapted to the shape of the connecting portion, and the slot is detachably connected to the connecting portion.
[0009] In one embodiment, a threaded hole is provided on the inner wall of the transmission member, a threaded section is provided on the outer wall of the chuck, and the threaded hole is threadedly connected to the threaded section.
[0010] In one embodiment, a second step is further provided on the inner wall of the inner rod, and the second step abuts against one end of the core protection tube head.
[0011] In one embodiment, a first boss area and a second boss area are provided on the outer wall of the inner rod, the first boss area and the second boss area are spaced apart in the vertical direction, and both the first boss area and the second boss area abut against the inner wall of the pen barrel.
[0012] In one embodiment, the inner wall of the pen cap is provided with a third boss area, and the third boss area abuts against the outer wall of the transmission member.
[0013] In one embodiment, the outer wall of the connecting member is provided with a third step and a fourth boss area, the third step abuts against one end of the pen barrel, and the fourth boss area abuts against the inner wall of the pen barrel.
[0014] In one embodiment, the length of the push rod is greater than the length of the rubber core.
[0015] In the embodiment of the utility model, an inner rod is fixed at one end of the pen barrel, and a rubber core is movably arranged in the inner rod. The rubber core passes through a core protection tube head embedded in the front end of the inner tube, and the core protection tube head can guide the rubber core, so that the rubber core can be extended from the inner rod conveniently. At the same time, the core protection tube head can also make the rubber core have better stability during the core extension process; the other end of the pen barrel is connected to the pen cap through a connecting piece, and a transmission member is also arranged in the pen barrel, one end of the transmission member is embedded in the pen cap, a spring is arranged on the outer sleeve of the transmission member, and a fixing member is arranged on the outer sleeve of the spring. When the transmission member moves, the spring can be compressed, thereby playing a certain buffering role and avoiding the transmission member from being directly pressed to the bottom; the fixing member is arranged in the inner rod, and the fixing member is detachably connected to the inner rod, which is convenient for disassembly and assembly, and the structure is stable and reliable. The chuck is detachably connected to the transmission member, and one end of the chuck is provided with at least two elastic expansion clips that can be used to clamp the push rod, and the outer wall of the elastic expansion clip is sleeved in the locking hoop, and the front end of the elastic expansion clip is provided with a hook that can return the locking hoop hook to its original position. The cam is provided with a ring step for limiting the movement of the locking hoop in a certain position in the inner rod, thereby preventing the locking hoop from moving relative to the inner rod, and the elastic expansion clip can move with the push rod, so that the elastic expansion clip can be opened or closed; the working principle of the utility model is as follows: pressing the pen cap downward will drive the transmission member to move, and the transmission member drives the clamp head and the push rod to move relative to the locking hoop, so that the elastic expansion clip can extend out of the locking hoop and change from a closed state to an open state, thereby facilitating the movement of the push rod. When the push rod moves, it will drive the rubber core to move as well, and then lead the rubber core out of the inner rod. Since the rubber core is made of rubber, there is a large friction resistance, which will make the rubber core stay in the current position; when the transmission member moves, the spring will be compressed. When the core is ejected, the transmission member will be driven back to its original position under the elastic force of the spring, and the transmission member will drive the elastic expansion clip on the clamp head to return to the locking hoop and change from an open state to a closed state to re-clamp the push rod, thereby preventing the push rod from moving, and when the transmission member returns to its original position, it will also bring the pen cap back to its original position, which is convenient for next use. In this embodiment, the cross section of the eraser core is a triangular structure, and the eraser core is slender as a whole, so that when erasing detail lines such as eyes and hair, the clarity of other lines will not be affected. The embodiment of the utility model adopts an eraser core with a triangular cross section, and the eraser core can be ejected by pressing the pen cap, so that students can use the eraser core as accurately as using a pen to erase the lines of details such as eyes and hair without affecting the clarity of other lines. The structure is simple and easy to use, which can meet the use needs of students. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0017] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the automatic eraser pen of the utility model;
[0018] Figure 2 This is a schematic structural diagram of an embodiment of the automatic eraser pen of the utility model;
[0019] Figure 3 This is an exploded schematic diagram of an embodiment of the automatic eraser pen of the utility model;
[0020] Figure 4 It is a structural schematic diagram of an embodiment of a clamp of an automatic eraser pen of the utility model;
[0021] Figure 5 It is a structural schematic diagram of an embodiment of the inner rod of the automatic eraser pen of the utility model;
[0022] Figure 6 It is a cross-sectional schematic diagram of an embodiment of the inner rod of the automatic eraser pen of the utility model;
[0023] Figure 7 It is a structural schematic diagram of an embodiment of a fixing member of an automatic eraser pen of the utility model;
[0024] Figure 8 It is a structural schematic diagram of an embodiment of a push rod of an automatic eraser pen of the utility model;
[0025] Fig. 9 It is a structural schematic diagram of an embodiment of the eraser core of the automatic eraser pen of the utility model;
[0026] Fig.10 It is a cross-sectional schematic diagram of an embodiment of the eraser core of the automatic eraser pen of the utility model;
[0027] Fig.11 It is a structural schematic diagram of an embodiment of a connecting piece of an automatic eraser pen of the utility model.
[0028] Description of Figure Numbers:
[0029] 100. Automatic eraser pen; 1. Pen body; 2. Inner rod; 21. Ring step; 22. First protrusion; 23. First step; 24. Second step; 25. First boss area; 26. Second boss area; 3. Pen cap; 4. Transmission member; 5. Fixing member; 51. Groove; 6. Connecting member; 61. Third step; 62. Fourth boss area; 7. Spring; 8. Push rod; 81. Sliding part; 82. Connecting part; 9. Clamp; 91. Elastic expansion clip; 911. Boss; 92. Threaded section; 110. Locking hoop; 120. Core protection tube head; 130. Rubber core; 1301. Card slot.
[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, and back), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0034] When students are drawing, they often need to use erasers to erase some lines. However, since ordinary erasers are large and thick, when erasing detailed lines, the clarity of other lines will be affected, and it is easy to erase the parts that should not be erased, so that they have to redraw, which affects work efficiency. The main purpose of the utility model is to provide an automatic eraser pen 100, which aims to solve the problem of how to erase detailed lines without affecting the clarity of other lines.
[0035] See also Figures 1 to 4 In one embodiment of the utility model, the automatic eraser pen 100 includes a pen barrel 1, an inner rod 2, a pen cap 3, a transmission member 4, a fixing member 5, a connecting member 6, a spring 7, a push rod 8, a chuck 9, a locking hoop 110, a core protection tube head 120 and a rubber core 130. The inner rod 2 is fixed in the pen barrel 1, and the rubber core 130 is movably arranged in the inner rod 2. The rubber core 130 passes through the core protection tube head 120 embedded in the front end of the inner rod 2; the pen barrel 1 is also provided with a transmission member 4, and the transmission member 4 is detachably connected to the chuck 9 in the inner rod 2. One end of the chuck 9 is provided with at least two elastic expansion clips 91 that can be used to clamp the push rod 8, and the elastic expansion clips 91 can be used to clamp the push rod 8. The outer wall of the elastic expansion clip 91 is sleeved in the locking hoop 110, and the front end of the elastic expansion clip 91 is provided with a boss 911 that can hook the locking hoop 110 back to its original position, and the inner rod 2 is provided with a ring step 21 that limits the movement of the locking hoop 110; the transmission member 4 is outer-mounted with a spring 7, and the outer side of the spring 7 is sleeved with a fixing member 5, and the fixing member 5 is detachably connected to the inner rod 2; a push rod 8 is provided in the transmission member 4, and the push rod 8 is detachably connected to the rubber core 130 in the inner rod 2, one end of the transmission member 4 is embedded in the pen cap 3, and the pen cap 3 and the pen body 1 are connected by a connecting member 6; the cross-section of the rubber core 130 is a triangular structure.
[0036] In the embodiment of the utility model, an inner rod 2 is fixed to one end of the pen barrel 1, and a rubber core 130 is movably arranged in the inner rod 2. The rubber core 130 passes through a core protection tube head 120 embedded in the front end of the inner tube. The core protection tube head 120 can guide the rubber core 130, so that the rubber core 130 can be extended from the inner rod 2. At the same time, the core protection tube head 120 can also make the rubber core 130 have better stability during the core extension process; the other end of the pen barrel 1 is connected to the pen cap 3 through a connecting piece 6, and a transmission member 4 is also arranged in the pen barrel 1, one end of the transmission member 4 is embedded in the pen cap 3, and the transmission member 4 is arranged on the outer sleeve There is a spring 7, and a fixing part 5 is sleeved on the outer side of the spring 7. When the transmission member 4 moves, the spring 7 can be compressed, thereby playing a certain buffering role and avoiding the transmission member 4 from being directly pressed to the bottom; the fixing part 5 is arranged in the inner rod 2, and the fixing part 5 is detachably connected to the inner rod 2, which is convenient for disassembly and assembly, and the structure is stable and reliable. The clamp 9 is detachably connected to the transmission member 4, and one end of the clamp 9 is provided with at least two petals of elastic expansion clips 91 that can be used to clamp the push rod 8. The outer wall of the elastic expansion clip 91 is sleeved in the locking hoop 110, and the front end of the elastic expansion clip 91 is provided with a hook that can hook the locking hoop 110 back to its original position. The boss 911 and the inner rod 2 are provided with a ring step 21 for limiting the movement of the locking hoop 110, thereby preventing the locking hoop 110 from moving relative to the inner rod 2, and the elastic expansion clip 91 can move with the push rod 8, so that the elastic expansion clip 91 is opened or closed; the working principle of the utility model is: pressing the pen cap 3 downward will drive the transmission member 4 to move, and the transmission member 4 drives the clamp 9 and the push rod 8 to move relative to the locking hoop 110, so that the elastic expansion clip 91 can extend out of the locking hoop 110 and change from a closed state to an open state, which is convenient for the movement of the push rod 8, and when the push rod 8 moves, it will drive the rubber core 130 The rubber core 130 is also moved, and then the rubber core 130 is led out of the inner rod 2. Since the rubber core 130 is made of rubber, there is a large friction resistance, which will make the rubber core 130 stay in the current position; when the transmission member 4 moves, it will compress the spring 7. After the core is out, the transmission member 4 is driven to return to the original position under the elastic force of the spring 7. The transmission member 4 drives the elastic expansion clip 91 on the clamp 9 to return to the locking hoop 110 and change from an open state to a closed state to re-clamp the push rod 8, thereby preventing the push rod 8 from moving. When the transmission member 4 returns to the original position, it will also bring the pen cap 3 back to the original position, which is convenient for the next use. In this embodiment, the cross section of the rubber core 130 is a triangular structure, and the rubber core 130 is slender as a whole, which will not affect the clarity of other lines when erasing detailed lines such as eyes and hair.
[0037] The technical solution of the utility model adopts an eraser core 130 with a triangular cross-section. The eraser core 130 can be ejected by pressing the pen cap 3, so that students can use the eraser core 130 to erase lines of details such as eyes and hair as accurately as using a pen without affecting the clarity of other lines. The utility model has a simple structure and is easy to use, which can meet the needs of students.
[0038] See also Figures 5 to 7 In one embodiment, a groove 51 is provided on the outer wall of the fixing member 5, and a first protrusion 22 is provided on the inner wall of the inner rod 2, and the groove 51 and the first protrusion 22 are detachably connected; specifically, in order to realize the detachable connection between the inner rod 2 and the fixing member 5, a groove 51 is provided on the outer wall of the fixing member 5, and a protrusion is provided on the inner wall of the inner rod 2. The fixing member 5 is inserted into the inner rod 2 until the groove 51 is engaged with the protrusion to complete the detachable connection between the fixing member 5 and the inner rod 2. The structure is simple and the disassembly and assembly are convenient.
[0039] In one embodiment, a first step 23 is further provided on the inner wall of the inner rod 2, and the first step 23 abuts against one end of the fixing member 5 away from the transmission member 4; specifically, in order to ensure the stability of the fixing member 5, a first step 23 is further provided on the inner wall of the inner rod 2, and the first step 23 abuts against one end of the fixing member 5 away from the transmission member 4, so that the fixing member 5 can remain stable when the transmission member 4 moves.
[0040] See also Figures 8 to 10 In one embodiment, the push rod 8 includes a sliding portion 81 and a connecting portion 82 that are connected to each other, the elastic expansion clip 91 is used to clamp the sliding portion 81, and the rubber core 130 is provided with a card slot 1301 that is adapted to the shape of the connecting portion 82, and the card slot 1301 is detachably connected to the connecting portion 82; specifically, in order to achieve the detachable connection between the push rod 8 and the rubber core 130, the push rod 8 includes a sliding portion 81 and a connecting portion 82 that are connected to each other, and the rubber core 130 is provided with a card slot 1301 that is adapted to the shape of the connecting portion 82, and the detachable connection between the push rod 8 and the rubber core 130 can be achieved by engaging the engaging portion with the card slot 1301, which has a simple structure and is easy to disassemble and assemble.
[0041] See also Figure 1 and Figure 4 In one embodiment, a threaded hole (not shown) is provided on the inner wall of the transmission member 4, and a threaded section 92 is provided on the outer wall of the chuck 9, and the threaded hole is threadedly connected to the threaded section 92; specifically, in order to achieve a detachable connection between the transmission member 4 and the chuck 9, so that the transmission member 4 can drive the chuck 9 to move, in this embodiment, a threaded hole is provided on the inner wall of the transmission member 4, and a threaded hole is provided on the outer wall of the chuck 9, and the detachable connection between the threaded hole and the threaded section 92 is achieved, the structure is simple, and disassembly and assembly are convenient.
[0042] In one embodiment, a second step 24 is further provided on the inner wall of the inner rod 2, and the second step 24 abuts against one end of the protective core tube head 120; specifically, when the automatic eraser pen 100 is used to erase lines, the rubber core 130 exerts an upward force on the protective core tube head 120. In order to ensure the stability of the protective core tube head 120 and prevent the protective core tube head 120 from moving upward relative to the inner rod 2, a second step 24 is further provided on the inner wall of the inner rod 2, and the second step 24 abuts against one end of the protective core tube head 120, thereby preventing the protective core tube head 120 from moving upward relative to the inner rod 2, thereby ensuring the stability of the protective core tube head 120 and the rubber core 130 during use.
[0043] See also Figure 5 and Figure 6 In one embodiment, a first boss area 25 and a second boss area 26 are provided on the outer wall of the inner rod 2, and the first boss area 25 and the second boss area 26 are spaced apart in the vertical direction, and the first boss area 25 and the second boss area 26 are both abutted against the inner wall of the pen barrel 1; specifically, in order to achieve a detachable connection between the inner rod 2 and the pen barrel 1, a first boss area 25 and a second boss area 26 are provided on the outer wall of the inner rod 2, the first boss area 25 includes a plurality of first bosses, and the second boss area 26 includes a plurality of second bosses, and the plurality of first bosses and the plurality of second bosses are arranged at intervals along the outer wall of the inner rod 2, so that when the inner rod 2 is inserted into the pen barrel 1, the plurality of first bosses and the plurality of second bosses are both abutted against the inner wall of the pen barrel 1, thereby achieving a detachable connection between the inner rod 2 and the pen barrel 1, with a simple structure and convenient disassembly and assembly.
[0044] In one embodiment, a third boss area (not shown) is provided on the inner wall of the pen cap 3, and the third boss area abuts against the outer wall of the transmission member 4; specifically, in order to achieve a detachable connection between the pen cap 3 and the transmission member 4, a third boss area is provided on the inner wall of the pen cap 3, and the third boss area includes a plurality of third bosses, and the plurality of third bosses are arranged at intervals along the inner wall of the pen cap 3. When the transmission member 4 is inserted into the pen cap 3, the plurality of third bosses all abut against the inner wall of the transmission member 4, thereby achieving a detachable connection between the pen cap 3 and the transmission member 4, with a simple structure and convenient disassembly and assembly.
[0045] See also Fig.11 In one embodiment, the outer wall of the connecting member 6 is provided with a third step 61 and a fourth boss area 62, the third step 61 abuts against one end of the pen barrel 1, and the fourth boss area 62 abuts against the inner wall of the pen barrel 1; specifically, the pen barrel 1 is a metal pen barrel, the connecting member 6 is a plastic connecting member, and the pen cap 3 is a plastic pen cap. The connecting member 6 is used to connect the pen barrel 1 and the pen cap 3, and the third step 61 and the fourth boss area 62 are provided on the outer wall of the connecting member 6. The third step 61 abuts against one end of the pen barrel 1 to prevent the connecting member 6 from moving downward relative to the pen barrel 1, and the fourth boss area 62 abuts against the inner wall of the pen barrel 1 to prevent the connecting member 6 from moving upward relative to the pen barrel 1.
[0046] In one embodiment, the length of the push rod 8 is greater than the length of the rubber core 130; specifically, as the rubber core 130 is continuously ejected, the position of the push rod 8 is continuously moved downward. In order to ensure that the rubber core 130 can be completely ejected from the automatic eraser pen 100, the length of the push rod 8 is greater than the length of the rubber core 130.
[0047] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. An automatic eraser pen, characterized in that: The automatic eraser pen comprises a pen barrel, an inner rod, a pen cap, a transmission member, a fixing member, a connecting member, a spring, a push rod, a chuck, a locking hoop, a core protection tube head and a rubber core. The inner rod is fixed in the pen barrel, the rubber core is movably arranged in the inner rod, and the rubber core passes through the core protection tube head embedded in the front end of the inner rod; the transmission member is also arranged in the pen barrel, and the transmission member is detachably connected to the chuck in the inner rod, one end of the chuck is provided with at least two elastic expansion clips that can be used to clamp the push rod, and the outer wall of the elastic expansion clip is sleeved on the locking hoop Inside, a boss capable of returning the locking hoop hook to its original position is arranged at the front end of the elastic expansion clip, and a ring step for limiting the movement of the locking hoop is arranged in the inner rod; the transmission member is outer-circuited with the spring, and the outer side of the spring is sleeved with the fixing member, and the fixing member is detachably connected to the inner rod; the transmission member is inner-circuited with the push rod, and the push rod is detachably connected to the rubber core in the inner rod, one end of the transmission member is embedded in the pen cap, and the pen cap and the pen barrel are connected by the connecting member; the cross-section of the rubber core is a triangular structure.
2. The automatic eraser pen according to claim 1, characterized in that: The outer wall of the fixing member is provided with a groove, the inner wall of the inner rod is provided with a first protrusion, and the groove is detachably connected to the first protrusion.
3. The automatic eraser pen according to claim 2, characterized in that: A first step is also provided on the inner wall of the inner rod, and the first step abuts against an end of the fixing member away from the transmission member.
4. The automatic eraser pen according to claim 1, characterized in that: The push rod comprises a sliding part and a connecting part which are connected to each other, the elastic expansion clip is used to clamp the sliding part, the rubber core is provided with a card slot which matches the shape of the connecting part, and the card slot is detachably connected to the connecting part.
5. The automatic eraser pen according to claim 1, characterized in that: A threaded hole is arranged on the inner wall of the transmission member, a threaded section is arranged on the outer wall of the chuck, and the threaded hole is threadedly connected with the threaded section.
6. The automatic eraser pen according to any one of claims 1 to 5, characterized in that: A second step is also provided on the inner wall of the inner rod, and the second step abuts against one end of the core protection tube head.
7. The automatic eraser pen according to any one of claims 1 to 5, characterized in that: A first boss area and a second boss area are provided on the outer wall of the inner rod. The first boss area and the second boss area are spaced apart in the vertical direction. Both the first boss area and the second boss area abut against the inner wall of the pen barrel.
8. The automatic eraser pen according to any one of claims 1 to 5, characterized in that: The inner wall of the pen cap is provided with a third boss area, and the third boss area abuts against the outer wall of the transmission member.
9. The automatic eraser pen according to any one of claims 1 to 5, characterized in that: The outer wall of the connecting piece is provided with a third step and a fourth boss area, the third step abuts against one end of the pen holder, and the fourth boss area abuts against the inner wall of the pen holder.
10. The automatic eraser pen according to any one of claims 1 to 5, characterized in that: The length of the push rod is greater than the length of the rubber core.