Writing pen control training device

By designing a writing pen control training device, the straight line trough and tension strips are used to train the straight line pen control ability of calligraphy learners, and the curve pen control ability is exercised through the rotation part and the transmission hole, which solves the problem of poor pen control ability of calligraphy learners, which is significantly Improved writing skills.

CN111001132BActive Publication Date: 2025-01-14王永刚
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Patent Information

Application Number
CN201911214089.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-12-02
Publication Date
2025-01-14
Estimated Expiration
2039-12-02

AI Technical Summary

Technical Problem

Calligraphy learners have poor pen control ability during the writing process, resulting in weak and weak dots and strokes, distorted structures, and disordered compositions, and the writing skills are improved very slowly.

Method used

A writing pen control training device is designed, including a base, a rotating part, a first training pen and a first tension bar. By providing a straight groove and a fixing part on the base, the fixed end of the first tension bar is arranged on the fixing part. , the free end of the first tension bar is connected to the first training pen. When pulling the first training pen, the calligraphy learner needs to overcome the resistance of the tension bar and exercise the power of holding the straight line of the stroke; at the same time, the rotation axis is set in the limit hole, The existence of the transmission hole allows calligraphy learners to overcome friction and drive the transmission hole to rotate and exercise the ability to control the curve.

Benefits of technology

The device systematically trains the straight and curved pen control ability of calligraphy learners in all aspects, significantly improves the muscle group pen control ability of calligraphy learners, and quickly improves writing skills. It is suitable for the pen control strength training of various texts and styles. .

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Abstract

The present application provides a writing pen control training device, comprising: a base, a rotating part, a first training pen and a first tension bar; the base is provided with a limit hole, a linear groove and a fixed part, and the fixed part is located on the extension line of the linear groove; the rotating part comprises a rotating shaft, a rotating block and a transmission hole, the rotating shaft is rotatably arranged in the limit hole, the bottom surface of the rotating block and the base are pressed against each other, and the transmission hole is opened on the top surface of the rotating block; the fixed end of the first tension bar is arranged on the fixed part, and the free end of the first tension bar is connected to the first training pen. The present application achieves the technical effect of significantly improving the pen control ability of the muscle group of calligraphy learners holding the pen for writing, and quickly improving the writing skills of calligraphy learners, and solves the technical problems that the muscle group of calligraphy learners holding the pen for writing has poor pen control ability, the dots and lines are weak, the structure is deformed and distorted, the composition is messy, and the writing skills improve very slowly.
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Description

Technical Field

[0001] The present application relates to the field of writing training devices, and in particular to a writing pen control training device. Background Art

[0002] Writing Chinese characters is a special action. When it rises to the level of art, it is the study and creation of calligraphy. Holding a brush or a hard pen to write requires "stability, accuracy, strength, and ease". To complete this action, a group of muscles in the same or adjacent parts with unified functions must play a good role. Only when this muscle group has enough strength, good accuracy, and perfect coordination can it effectively control the writing tool and complete the writing action well.

[0003] In the process of writing, copying and creating calligraphy, calligraphy learners will quickly learn how to move the brush, how to structure and how to lay out the layout under the guidance of teachers. However, the pen-holding muscle group has poor pen-control ability, and the ability to control the pen lags far behind the cognition of the movement of the pen, structure and composition of the text. When writing, they show problems such as "weak dots and lines, deformed and distorted structure, and chaotic composition". After writing for many years, they still cannot control the brush or hard pen well. Therefore, for a long time, the writing skills of most calligraphy learners have improved very slowly. Summary of the invention

[0004] The purpose of this application is to provide a writing pen control training device to solve the technical problems of calligraphy learners' poor pen control ability of the muscle groups used to hold the pen for writing, weak dots and strokes, deformed and distorted structures, chaotic composition, and very slow improvement of writing skills.

[0005] The purpose of the present application is to provide a writing pen control training device, comprising: a base, a rotating part, a first training pen and a first tension bar;

[0006] The base is provided with a limiting hole, a linear groove and a fixing portion, the width of the linear groove matches the pen head of the first training pen, and the fixing portion is located on the extension line of the linear groove;

[0007] The rotating part includes a rotating shaft, a rotating block and a transmission hole, wherein the rotating shaft is fixedly arranged on the bottom surface of the rotating block, the rotating shaft is rotatably arranged in the limiting hole, the bottom surface of the rotating block and the base are pressed against each other, and the transmission hole is opened on the top surface of the rotating block;

[0008] The fixed end of the first tension bar is arranged on the fixing portion, and the free end of the first tension bar is connected to the first training pen.

[0009] Furthermore, there are multiple straight grooves;

[0010] A plurality of linear grooves are radially distributed on the base with the fixing portion as the center.

[0011] Furthermore, the base is also provided with an S-shaped groove;

[0012] A second tension bar is fixedly arranged at one end of the S-shaped groove, and a free end of the second tension bar is connected to the training pen.

[0013] Furthermore, the base is also provided with a spiral groove;

[0014] A third tension bar is fixedly arranged at the center point of the spiral groove, and a free end of the third tension bar is connected to the training pen.

[0015] Furthermore, the fixing portion is a long bolt;

[0016] The long bolt is screwed into the base, the fixed end of the first tension strip is arranged on the long bolt, and the height of the long bolt is adjustable.

[0017] Furthermore, a pen slot is provided on the base;

[0018] The pen slot is used for placing the training pen.

[0019] Furthermore, the first tension strip is a rubber band.

[0020] Furthermore, the rotating block is a turntable.

[0021] Furthermore, there are multiple transmission holes;

[0022] A plurality of transmission holes are arranged on the turntable along the radial direction of the turntable.

[0023] Further, it also includes a plurality of concentric circular grooves;

[0024] A plurality of concentric circular grooves are provided on the base, and a fourth tension bar is provided at the center of each concentric circular groove;

[0025] The free end of the fourth tension strip is connected to the training pen.

[0026] Compared with the prior art, the advantages of the embodiments of the present application are:

[0027] The present application provides a writing and pen-control training device, comprising: a base, a rotating part, a first training pen and a first tension bar; a limiting hole, a linear groove and a fixing part are arranged on the base, the width of the linear groove matches the pen head of the first training pen, and the fixing part is located on the extension line of the linear groove; the rotating part comprises a rotating shaft, a rotating block and a transmission hole, the rotating shaft is fixedly arranged on the bottom surface of the rotating block, the rotating shaft is rotatably arranged in the limiting hole, the bottom surface of the rotating block and the base are pressed against each other, and the transmission hole is opened on the top surface of the rotating block; the fixed end of the first tension bar is arranged on the fixing part, and the free end of the first tension bar is connected to the first training pen.

[0028] The writing pen control training device provided in the present application is provided with a straight groove on the base, and a fixing part is provided in the extension direction of the straight groove, so that the fixed end of the first tension bar is provided on the fixing part, and the free end of the first tension bar is connected to the first training pen, so that when the calligraphy learner pulls the first training pen to move on the straight groove, it is necessary to overcome the resistance of the first tension bar pulling the first training pen, thereby exercising the calligraphy learner's strength to hold the pen and draw straight lines; by rotating the shaft in the limiting hole, the shaft and the limiting hole are tightly matched, the bottom surface of the rotating block and the base are pressed against each other, and the transmission hole is opened on the top surface of the rotating block, Therefore, the calligraphy learner can place the pen tip of the first training pen on the transmission hole, and artificially overcome the friction between the rotating block and the base and the friction between the shaft and the limit hole to drive the transmission hole to rotate, thereby realizing the training of the calligraphy learner's strength to hold the pen and draw curves. Therefore, the writing pen control training device of the present application systematically trains the calligraphy learner's straight line pen control ability and curve pen control ability, and can be suitable for pen control strength training of any kind of text or script, achieving the technical effect of significantly improving the pen control ability of the calligraphy learner's muscle group for holding the pen to write, and quickly improving the calligraphy learner's writing skills, and solving the technical problems of poor pen control ability of the calligraphy learner's muscle group for holding the pen to write, weak dots and lines, deformed and distorted structures, chaotic composition, and very slow improvement of writing skills. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the structure of a writing and pen control training device provided in an embodiment of the present application;

[0031] Figure 2 This is a display diagram showing that the writing and pen control training device of the present application is suitable for training the straight line parts of characters;

[0032] Figure 3 This is a display diagram showing that the writing and pen control training device of the present application is suitable for training the curved parts of characters;

[0033] Figure 4 This is a display diagram of the writing pen control training device of the present application being suitable for training multi-angle straight lines in text;

[0034] Figure 5 This is a display diagram of the writing and pen control training device of the present application being suitable for training texts containing S-shaped lines;

[0035] Figure 6 The writing and pen control training device of the present application is suitable for displaying a text training containing spiral lines;

[0036] Figure 7 The writing and pen control training device of the present application is suitable for displaying a text training diagram containing arcs of different diameters;

[0037] Among them, the reference numerals are: base 1, rotating part 2, first training pen 3, first tension bar 4, linear groove 5, fixing part 6, S-shaped groove 7, second tension bar 8, spiral groove 9, third tension bar 10, concentric groove 11, second training pen 12, third training pen 13, fourth training pen 14, fourth tension bar 15. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] See also Figure 1 , Figure 1 This is a structural schematic diagram of a writing and pen control training device provided by the present application; the present application provides a writing and pen control training device, comprising: a base 1, a rotating part 2, a first training pen 3 and a first tension bar 4;

[0042] The base 1 is provided with a limiting hole, a linear groove 5 and a fixing portion 6. The width of the linear groove 5 matches the pen head of the first training pen 3. The fixing portion 6 is located on the extension line of the linear groove 5.

[0043] The rotating part 2 includes a rotating shaft, a rotating block and a transmission hole. The rotating shaft is fixedly arranged on the bottom surface of the rotating block. The rotating shaft is rotatably arranged in the limiting hole. The bottom surface of the rotating block and the base 1 are pressed against each other. The transmission hole is opened on the top surface of the rotating block.

[0044] The fixed end of the first tension bar 4 is arranged on the fixing portion 6 , and the free end of the first tension bar 4 is detachably connected to the first training pen 3 .

[0045] It should be noted that the linear groove 5 is provided on the upper surface of the base 1, and the bottom surface of the linear groove 5 can be a flat surface or a rough and uneven sand surface. In the present application, the bottom surface of the linear groove 5 is preferably a rough and uneven sand surface, so as to increase the resistance of the first training pen 3 moving on the linear groove 5. If the calligraphy learner needs to strengthen the strength of drawing straight lines, the friction can be increased by increasing the pressure between the first training pen 3 and the linear groove 5, so as to achieve a better effect of training the strength of drawing straight lines. Please refer to Figure 2 , Figure 2 This is a display diagram of the writing pen control training device of the present application being suitable for training straight line parts in text.

[0046] The rotating part 2 includes a rotating shaft, a rotating block and a transmission hole, wherein the rotating block can be in the shape of a turntable, a rotating rod, a rotating plate, etc., and is not limited here. The rotating shaft is fixedly arranged on the bottom surface of the rotating block, specifically at the center position of the bottom surface of the rotating block. The diameter of the rotating shaft matches that of the limiting hole, so that the rotating shaft can be rotatably arranged in the limiting hole without loosening, and the rotating shaft and the limiting hole are tightly matched, which increases the resistance to rotation of the rotating block. The rotating block and the base 1 are pressed against each other, so that there is friction between the rotating block and the base 1, so that the calligraphy learner can press the pen head of the first training pen 3 on the transmission hole, and drive the rotating part 2 to rotate through the transmission hole. Due to the friction between the rotating block and the base 1 and the resistance between the rotating shaft and the limiting hole, the calligraphy learner's strength in holding the pen to draw curves is trained. Please refer to Figure 3 , Figure 3 This is a display diagram showing that the writing and pen control training device of the present application is suitable for training the curved parts of characters.

[0047] The fixed end of the first tension strip 4 is arranged on the fixing part 6, and the free end of the first tension strip 4 is connected to the first training pen 3, wherein the first tension strip 4 can be a rubber band, or a spring or other component. As long as it is a component that can be stretched and provide stretching resistance, it belongs to the protection scope of this scheme.

[0048] The base 1 may also be provided with an intelligent counter, a music box, etc., which can report and evaluate the training situation, reward games, etc. to motivate the trainees, or play music, recite poems, tell stories, etc. to enhance the interest of the training.

[0049] Words (including Chinese, Japanese, Korean, English, Arabic or Latin, etc.) or fonts (including five kinds of calligraphy fonts: seal, official, regular, running and cursive) are all composed of a combination of straight lines and curves. The writing pen control training device of the present application comprehensively and systematically exercises the pen control strength for writing straight lines and curves, and has a wide range of applicability.

[0050] The writing and pen control training device provided in the present application is provided with a straight groove 5 on the base 1, and a fixing portion 6 is provided in the extension direction of the straight groove, so that the fixed end of the first tension bar 4 is provided on the fixing portion 6. The free end of the first tension bar 4 is connected to the first training pen, so that when the calligraphy learner pulls the first training pen to move on the straight groove 5, the resistance of the first tension bar 4 pulling the first training pen is overcome, thereby achieving the strength of the calligraphy learner to hold the pen and draw straight lines; by rotating the shaft in the limiting hole, the shaft and the limiting hole are closely matched, the bottom surface of the rotating block and the base 1 are pressed against each other, and the transmission hole is opened on the top surface of the rotating block, so that the calligraphy learner can place the pen head of the training pen on the transmission hole, and artificially overcome the friction between the rotating block and the base 1 and the friction between the shaft and the limiting hole to drive the transmission hole to rotate, thereby achieving the strength of the calligraphy learner to hold the pen and draw curves. Therefore, the writing pen control training device of the present application comprehensively and systematically trains the straight line pen control ability and curve pen control ability of the calligraphy learner, and can be applied to the pen control strength training of any text or script, achieving the technical effect of significantly improving the pen control ability of the muscle group of the calligraphy learner who holds the pen to write, and quickly improving the writing skills of the calligraphy learner, and solving the problems of poor pen control ability of the muscle group of the calligraphy learner who holds the pen to write, weak dots and lines, Technical problems include structural deformation and distortion, disorganized layout, and very slow improvement in writing skills.

[0051] The present application is applicable to calligraphy learners of all ages, especially young calligraphy learners. As we all know, the calligraphy learning period for young people is very long, because the muscle groups in various parts of the body are not fully developed, and their pen control ability improves very slowly. The writing pen control training device of the present application can effectively exercise the pen control muscle groups of young people and enhance their pen control ability. At the same time, under the guidance of the teacher, they can cooperate in learning the ability of pen movement, structure, layout, etc., so as to comprehensively improve the efficiency of young people's calligraphy learning, which is conducive to cultivating more young calligraphy enthusiasts; for elderly calligraphy learners, because their muscle groups begin to degenerate and atrophy, their pen control ability decreases. By using the writing pen control training device of the present application for targeted training, the pen control ability of elderly calligraphy learners can be maintained or even improved, so that the calligraphy hobby can be preserved; for young or middle-aged people with less learning time, the writing pen control training device of the present application is conducive to improving their calligraphy learning efficiency and saving their learning time.

[0052] As a further improvement, the writing pen control training device provided in the embodiment of the present application has multiple straight grooves 5;

[0053] A plurality of linear grooves 5 are radially distributed on the base 1 with the fixing portion 6 as the center;

[0054] Specifically, a plurality of linear grooves 5 are radially distributed at equal angles on the base 1 with the fixed portion 6 as the radiating points. Generally speaking, the straight lines of characters have various angles, so calligraphy learners can train the straight line pen control strength at various angles, and comprehensively train calligraphy learners' straight line writing strength. Please refer to Figure 4 , Figure 4 This is a display diagram of the writing and pen control training device of the present application that is suitable for training multi-angle straight lines in text.

[0055] As a further improvement, the base 1 of the writing and pen control training device provided in the embodiment of Shenqing is further provided with an S-shaped groove 7;

[0056] A second tension bar 8 is fixedly disposed at one end of the S-shaped groove 7 , and a free end of the second tension bar 8 is detachably connected to the second training pen 12 .

[0057] Specifically, there are many forms of curves in the text, such as arc or S shape, etc. The width of the S-shaped groove 7 matches the pen head of the second training pen 12, so that the second training pen 12 can slide along the direction of the S-shaped groove 7. A second tension bar 8 is provided at one end of the S-shaped groove 7. The second tension bar 8 is rubber. The free end of the second tension bar 8 is connected to the second training pen 12. When the writing trainer controls the second training pen 12 to slide on the S-shaped groove 7, it is necessary to overcome the tension of the second tension bar 8, so as to exercise the strength of the S-shaped lines in the writing text, and the training is more targeted and has a better training effect; please refer to Figure 5 , Figure 5 The writing and pen control training device of the present application is suitable for displaying pictures of text training containing S-shaped lines.

[0058] As a further improvement, the base 1 of the writing and pen control training device provided in the embodiment of the present application is further provided with a spiral groove 9;

[0059] A third tension bar 10 is fixedly disposed at the center point of the spiral groove 9 , and a free end of the third tension bar 10 is detachably connected to a third training pen 13 .

[0060] Specifically, in addition to arc curves and S-shaped curves, some calligraphy fonts also have spiral curves. The width of the spiral groove 9 matches the pen tip of the third training pen 13, so that the third training pen 13 can slide along the direction of the spiral groove 9. A third tension bar 10 is fixedly arranged at the center point of the spiral groove 9. The third tension bar 10 is a rubber band. The free end of the third tension bar 10 is connected to the third training pen 13. Therefore, when the writing trainer controls the training pen to slide on the spiral groove 9, it is necessary to overcome the tension of the third tension bar 10, so as to specifically train the strength of the spiral lines in the vertical text; please refer to Figure 6 , Figure 6The writing and pen control training device of the present application is suitable for displaying pictures of text training containing spiral lines.

[0061] As a further improvement, the fixing part of the writing and pen control training device provided in the embodiment of the present application has 6 long bolts;

[0062] The long bolt is screwed into the base 1, and the fixed end of the first tension bar 4 is arranged on the long bolt. The height of the long bolt is adjustable.

[0063] Specifically, a threaded hole matching the thread of the long bolt is provided on the base 1. The long bolt is screwed into the threaded hole, and its height extending out of the plane of the base 1 can be adjusted by turning the long screw of the knob. The fixed end of the first tension bar 4 is tied to the long bolt, and the free end of the first tension bar 4 is connected to the training pen. The writing learner can indirectly adjust the relative distance between the fixed end of the first tension bar 4 and the plane of the base 1 by turning the long bolt of the knob, and at the same time adjust the free end of the first tension bar 4 to different positions on the training pen. By pulling the first tension bar, the pen control strength of the calligraphy learner when holding the training pen in different parts of the hand can be exercised. The pen control points of different training pens are different. For example, the pen control point of a brush is generally higher, and the pen control point of a fountain pen is generally lower.

[0064] As a further improvement, the base 1 of the writing and pen control training device provided in the embodiment of the present application is also provided with a pen slot;

[0065] The pen slot is used to place the first training pen 3 .

[0066] As a further improvement, the first tension bar 4 of the writing and pen control training device provided in the embodiment of the present application is a rubber band, which has a good tension effect and lowers the production cost.

[0067] As a further improvement, the rotating block provided in the embodiment of the present application is a turntable, so that the contact area between the base 1 and the rotating part 2 can be maximized, thereby increasing the friction between the base 1 and the rotating part 2.

[0068] As a further improvement, the embodiment of the present application provides a plurality of transmission holes, which are arranged on the turntable along the radial direction of the turntable. The writing learner can place the pen head of the training pen in different rotation holes to drive the rotating part 2 to rotate, thereby training the writing trainer to write arcs of different diameters. Please refer to Figure 7 , Figure 7 The writing and pen control training device of the present application is suitable for displaying diagrams of text training containing arcs of different diameters.

[0069] As a further improvement, the writing pen control training device provided in the embodiment of the present application further includes a plurality of concentric circular grooves 11;

[0070] A plurality of concentric circular grooves 11 are provided on the base 1 , and a fourth tension bar 15 is provided at the center of the concentric circular grooves 11 ;

[0071] The free end of the fourth tension strip 15 is detachably connected to the fourth training pen 14 .

[0072] Specifically, the groove width of each concentric groove 11 matches the pen tip of the fourth training pen 14, so that the fourth training pen 14 can slide along each concentric groove 11, and a fourth tension bar 15 is provided at the center of the concentric groove 11, and the free end of the fourth tension bar 15 is connected to the fourth training pen 14, so that when the writing learner controls the fourth training pen 14 to slide on the concentric groove 11, the tensile force of the fourth tension bar needs to be overcome, which can also train the writing trainee's strength to write arcs of different diameters.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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 or all of the technical features therein may be replaced by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A writing pen control training device, characterized in that: include: A base, a rotating part, a first training pen and a first tension bar; The base is provided with a limiting hole, a linear groove and a fixing portion, the width of the linear groove matches the pen head of the first training pen, and the fixing portion is located on the extension line of the linear groove; the bottom surface of the linear groove is a rough and uneven sand surface; The rotating part includes a rotating shaft, a rotating block and a transmission hole, wherein the rotating shaft is fixedly arranged on the bottom surface of the rotating block, the rotating shaft is rotatably arranged in the limiting hole, the bottom surface of the rotating block and the base are pressed against each other, and the transmission hole is opened on the top surface of the rotating block; The fixed end of the first tension bar is disposed on the fixed portion, and the free end of the first tension bar is detachably connected to the first training pen; The rotating block is a turntable; There are multiple transmission holes; A plurality of transmission holes are arranged on the turntable along the radial direction of the turntable.

2. The writing pen control training device according to claim 1, characterized in that: There are multiple straight grooves; A plurality of linear grooves are radially distributed on the base with the fixing portion as the center.

3. The writing pen control training device according to claim 1, characterized in that: The base is also provided with an S-shaped groove; A second tension bar is fixedly arranged at one end of the S-shaped groove, and a free end of the second tension bar is detachably connected to the second training pen.

4. The writing pen control training device according to claim 1, characterized in that: The base is also provided with a spiral groove; A third tension bar is fixedly arranged at the center point of the spiral groove, and a free end of the third tension bar is detachably connected to a third training pen.

5. The writing pen control training device according to claim 1, characterized in that: The fixing part is a long bolt; The long bolt is screwed into the base, the fixed end of the first tension strip is arranged on the long bolt, and the height of the long bolt is adjustable.

6. The writing pen control training device according to claim 1, characterized in that: The base is also provided with a pen slot; The pen slot is used for placing the first training pen.

7. The writing pen control training device according to claim 1, characterized in that: The first tension strip is a rubber band.

8. The writing and pen control training device according to claim 1, characterized in that: Also included are a plurality of concentric circular grooves; A plurality of concentric circular grooves are provided on the base, and a fourth tension bar is provided at the center of each concentric circular groove; The free end of the fourth tension strip is detachably connected to the fourth training pen.

Citation Information

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