Drawing device

By integrating a multi-stage paper tube and paper outlet design into the drawing device, the problem of existing drawing devices being unable to quickly adapt to the paper requirements of different drawing formats is solved, enabling rapid paper switching and diversified support.

CN223812459UActive Publication Date: 2026-01-20ANHUI KETU COM INTELLIGENT TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520630334.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-03
Publication Date
2026-01-20
Estimated Expiration
2035-04-03

AI Technical Summary

Technical Problem

Existing drawing devices cannot quickly and flexibly adapt to the paper requirements of different drawing formats, resulting in cumbersome and inefficient paper changing operations.

Method used

A drawing device comprising a support plate, a drawing board, and a roll is designed. The roll integrates multiple paper tubes, which are selected to draw paper through the paper outlet according to their different textures and thicknesses. Combined with the coordinated work of a central rod, a fixing block, and a wedge, the drawing paper can be switched quickly.

Benefits of technology

It improves the convenience and flexibility of drawing creation, allowing users to quickly select and switch between different textures and thicknesses of drawing paper to meet diverse drawing needs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of drawing, in particular to a drawing device, which comprises a support plate, a base plate and a drawing device, a groove is formed in the front end of the base; the drawing board is hinged to the groove through a rotating rod, and the inclination angle between the back side of the drawing board and the end face of the supporting board is adjusted through a limiting device; the winding drum is detachably connected to the side portion of the drawing board, a plurality of paper tubes are arranged in an inner cavity of the winding drum in the circumferential direction of the length direction with a center rod as the axis, drawing paper with different textures and thicknesses is wound in the paper tubes, and the multiple paper tubes are integrally contained in the winding drum; wherein a paper outlet used for drawing the drawing paper is formed in the winding drum, and the drawing paper on different paper tubes is selectively drawn through the paper outlet; the drawing tool aims at solving the problems that when an existing drawing tool meets different drawing form requirements, paper changing operation is tedious, and efficiency is low.
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Description

TECHNICAL FIELD

[0001] The utility model relates to drawing technical field, concretely relates to a drawing device. BACKGROUND

[0002] Drawing is the basis of artistic creation and an important way for artists to express their creativity and emotions. With the increasing richness and diversification of artistic expression, drawing devices play an increasingly important role in the fields of art creation, education and training, and design expression.

[0003] The application number CN202320365669.5 provides a drawing device, which comprises a main connecting rod and a moving assembly, the inner side of the main connecting rod is connected with an inner rod in an extension mode, the top end of the inner rod is provided with a threaded joint, the upper side of the threaded joint is connected with a support frame in a threaded mode, the lower side of the front and rear ends of the main connecting rod is welded with a threaded sleeve, the moving assembly is connected with the inner side of the threaded sleeve in a threaded mode, and the moving assembly comprises a threaded rod one and a rolling wheel, the bottom end of the threaded rod one is fixedly installed with a rolling wheel. The drawing device is connected with the support frame in a threaded mode through the support frame and the threaded joint, so that when the drawing device needs to be carried, the user can separate the support frame and the threaded joint, disassemble the support frame connected with the drawing device into parts, thereby reducing the length of the original support frame, facilitating the carrying of the drawing device, and the paper positioning frame can limit the paper when the drawing paper is placed on the surface of the drawing board, thereby facilitating the user to draw by hand.

[0004] Since drawing is divided into various forms, such as sketching, watercolor, colored pencil, etc., different drawing forms have different requirements for the texture, thickness and characteristics of paper. However, the drawing device in the prior art can usually only meet the basic single static drawing requirement and cannot quickly and flexibly provide selective support according to the paper requirements of various drawing forms. When different drawing styles or materials need to be switched, the user often needs to manually replace the paper, which is complex and time-consuming in operation process, seriously limiting the convenience and flexibility of drawing creation. UTILITY MODEL CONTENT

[0005] In view of the above problems of the prior art, the utility model aims to solve the problem of complicated paper changing operation and low efficiency of existing drawing tools when facing different drawing form requirements.

[0006] The utility model discloses the following technical scheme: a drawing device, the drawing device includes: support plate is equipped with one end surface, its front end is equipped with recess, drawing board is hinged in recess place through the rotary lever, and its back side is adjusted with the inclination angle of support plate end surface through the limiting device, drum is detachably connected in the side portion of drawing board, and the inner chamber is coaxial with center rod, and is equipped with a plurality of paper tubes along the length direction circumference, and each paper tube is rolled and has the drawing paper of different texture, thickness respectively, and a plurality of paper tubes integrated formula are stored in the drum, wherein, the paper outlet for drawing paper is equipped on the drum, and the drawing paper on different paper tube is selectively drawn through the paper outlet.

[0007] As a preferred technical scheme of the utility model, the drum includes: a center rod, the center rod is located at the center of the drum; a plurality of coaxial ring-shaped paper tubes are sequentially sleeved on the outer periphery of the center rod from inside to outside, the diameters of the paper tubes gradually increase, and the paper tubes are arranged in a stepped manner to form a multi-layer nested stacked structure; a ring-shaped interlayer is formed on each paper tube, and the drawing paper is placed in the ring-shaped interlayer; a paper outlet is arranged on the same side of the plurality of paper tubes and corresponds to the ring-shaped interlayer.

[0008] As a preferred technical scheme of the utility model, the drum includes: a paper outlet, the side wall of the drum is provided with the paper outlet along the length direction thereof, and the cross section of the paper outlet is in the shape of a trapezoid, that is, the opening width gradually shrinks from inside to outside; a rotating disc is rotatably arranged on the upper and lower sides of the inner cavity of the drum, the two rotating discs are connected by the center rod, and the rotating disc located at the upper side is fixedly connected with a protrusion outside; a plurality of fixing blocks are circumferentially arranged on the upper and lower parts of the center rod, and a through slot is formed in the middle of each fixing block; a wedge block is provided with a strip-shaped slot corresponding to the through slot, the wedge block is movably connected with the fixing block through the strip-shaped slot; one side of the wedge block is in the shape of an arc, and the arc surface shape of the wedge block is matched with the inner wall of the trapezoidal cross section of the paper outlet; one end of a spring is connected to the inner side of the through slot, and the other end of the spring is connected to the wedge block, so that the wedge block elastically expands and contracts in the through slot of the fixing block; a paper tube is rotatably connected to the upper and lower ends of the wedge block; a rotating wheel is arranged at the front end of the wedge block, an annular slide is arranged on the inner wall of the drum and corresponds to the rotating track of the wedge block, and the wedge block slides in the annular slide through the rotating wheel.

[0009] As a preferred technical scheme of the utility model, the limiting device includes: a limiting frame, the limiting frame is arranged on both sides of the end surface of the support plate, and a plurality of limiting slots are formed in the limiting frame; a supporting rod is hingedly connected to the back surface of the drawing board at one end, and a connecting rod is connected to the other end of the supporting rod and is clamped in the limiting slot through the connecting rod.

[0010] As a preferred technical scheme of the utility model, the placing rack for placing the roll is arranged on both sides of the back of the drawing board, a hinge is rotatably arranged in the placing rack, and the hinge is connected with the roll in a clamping mode.

[0011] As a preferred technical scheme of the utility model, the bottom of the drawing board is provided with a base, and the base is connected with the drawing board through an extension rod.

[0012] As a preferred technical scheme of the utility model, a protruding part is arranged at the bottom edge of the drawing board, the protruding part and the drawing board form an L-shaped groove, and the L-shaped groove is used for placing the paintbrush.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model discloses a drawing board, which comprises a drawing board body, a plurality of paper rolls, a rotating shaft, a rotating disc, a plurality of fixed blocks, a plurality of wedges, a plurality of springs, a plurality of paper outlets and a plurality of paper tubes.

[0015] The specific technical scheme and beneficial effects of the utility model will be described in detail in the following specific implementation mode in combination with the drawings. DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the drawings without paying creative labor.

[0017] Figure 1 The whole structure of the drawing device is schematically shown in the drawings Figure 1 ;

[0018] Figure 2 The whole structure of the drawing device is schematically shown in the drawings Figure 2 ;

[0019] Figure 3 The local structure of the roll in the first embodiment of the utility model is schematically shown in the drawings

[0020] Figure 4 The whole structure of the roll in the second embodiment of the utility model is schematically shown in the drawings

[0021] Figure 5 is a partial perspective view of the reel in Embodiment Two of the present application;

[0022] Figure 6 is a top view of the internal structure of the reel in Embodiment Two of the present application;

[0023] In the figure: 1, support plate; 2, groove; 3, drawing board; 4, rotating rod; 5, reel; 6, center rod; 7, paper tube; 8, paper outlet; 9, rotating disc; 10, protruding block; 11, fixed block; 12, through slot; 13, wedge block; 14, strip-shaped slot; 15, limiting frame; 16, limiting slot; 17, support rod; 18, connecting rod; 19, placing frame; 20, hinge; 21, base; 22, telescopic rod; 23, rotating wheel; DETAILED DESCRIPTION

[0024] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] The drawing device of the utility model, please see Figures 1 to 6 The drawing device includes: a support plate 1 provided with an end face; a groove 2 is arranged at the front end of the support plate 1; a drawing board 3 is hingedly connected to the groove 2 through a rotating rod 4, and the back side of the drawing board 3 is adjusted in inclination angle with the end face of the support plate 1 through a limiting device; a reel 5 is detachably connected to the side of the drawing board 3, the inner cavity of the reel 5 is provided with a plurality of paper tubes 7 as the axis of a center rod 6 and circumferentially along the length direction, each of the paper tubes 7 is respectively wound with drawing paper of different textures and thicknesses, and the plurality of paper tubes 7 are integrally stored in the reel 5; wherein, a paper outlet 8 for drawing the drawing paper is arranged on the reel 5, and the drawing paper on the different paper tubes 7 is selectively drawn through the paper outlet 8.

[0026] The application solves the problem of the existing drawing tool in the face of different drawing form needs, and the paper changing operation is complicated and low in efficiency. The device comprises a support plate 1, a drawing board 3 and a roller 5, wherein one end surface of the support plate 1 is used to support the drawing board 3, the front end is provided with a groove 2, the drawing board 3 is hinged at the groove 2 through a rotating rod 4, and the inclination angle of the drawing board 3 with the end surface of the support plate 1 is adjusted through the limiting device arranged on the back side of the drawing board 3, so as to meet the angle adjustment requirement of the user for the drawing board 3; the roller 5 is detachably connected to the side of the drawing board 3, the inner cavity is taken as the shaft of the center rod 6, a plurality of paper tubes 7 for storing different texture and thickness drawing paper are integrated along the circumference, for example, sketch creation usually needs sketch paper with medium rough texture to increase the adhesion of pencil; and watercolor drawing needs to match watercolor paper with special embossing and good water absorption performance, so as to facilitate the uniform diffusion of pigment; colored pencil requires the use of paper with fine and smooth texture, so as to show the smoothness and color level of the colored pencil; each paper tube 7 is wound and unwound with the above-mentioned drawing paper suitable for different drawing forms, such as sketch paper, watercolor paper or colored pencil paper, so as to realize integrated storage. In order to facilitate the user to quickly select different drawing paper, the roller 5 is provided with a paper outlet 8, the user can selectively extract the drawing paper in the different paper tubes 7 through the paper outlet 8, the step of manually replacing the drawing paper is saved, and the convenience and flexibility of drawing creation are significantly improved.

[0027] Referring to Figure 6 As shown in the drawings, as an embodiment of the application, the roller 5 comprises a center rod 6 located at the center of the roller 5, and a plurality of coaxial annular paper tubes 7 are sequentially sleeved on the outer periphery of the center rod 6 from the inside to the outside, the diameters of the paper tubes 7 are gradually increased, and the paper tubes 7 are arranged in a stepped manner to form a multi-layer nested laminated structure; a ring-shaped interlayer is formed on each paper tube 7, and the drawing paper is placed in the ring-shaped interlayer; and a paper outlet 8 is arranged on the same side of the plurality of paper tubes 7 and corresponds to the ring-shaped interlayer.

[0028] That is, in the embodiment, the roller 5 adopts a laminated multi-level nested structure to realize integrated storage and selective extraction of a plurality of types of drawing paper. Specifically, the center of the roller 5 is provided with a center rod 6 to provide a support shaft for the installation of the multi-level paper tubes 7; a plurality of coaxial annular paper tubes 7 are sequentially sleeved on the outer periphery of the center rod 6 from the inside to the outside, the diameters of the paper tubes 7 are gradually increased, and the paper tubes 7 are arranged in a stepped manner to form a multi-layer nested laminated structure; a ring-shaped interlayer is formed on each paper tube 7, and the drawing paper of different types, thicknesses and textures is wound and unwound on each paper tube 7 to meet the diversified needs of the user for the drawing paper under a plurality of drawing forms; a plurality of paper outlets 8 are arranged on the same side of the plurality of paper tubes 7 along the position of the ring-shaped interlayer, and the drawing paper of the corresponding style is directly taken to draw.

[0029] In the laminated structure, the paper tubes 7 of different levels are coaxially fixed by the center rod 6, and the reasonable gap distribution between the paper tubes 7 in space is ensured by the gradually increasing diameter setting, which not only avoids the interference between the paper tubes 7 in the multi-layer structure, but also enables the drawing paper on each paper tube 7 to be kept in a roll-out state under the constraint of the annular interlayer; the user can selectively extract the drawing paper corresponding to a certain layer of the paper tube 7 through the paper outlet 8 according to different drawing requirements, which greatly improves the convenience and efficiency of drawing paper selection.

[0030] Referring to Figures 3 to 5 As shown in the drawings, as an embodiment of the present application, the reel 5 comprises: a paper outlet 8, the side wall of the reel 5 is provided with the paper outlet 8 along the length direction thereof, the cross section of the paper outlet 8 is trapezoidal, that is, the opening width gradually shrinks from inside to outside; a rotating disc 9, the rotating disc 9 is rotatably arranged on the upper and lower sides of the inner cavity of the reel 5, the two rotating discs 9 are connected by the center rod 6, the rotating disc 9 on the upper side is externally fixedly connected with a protruding block 10; a fixed block 11, a plurality of fixed blocks 11 are circumferentially arranged on the upper and lower parts of the center rod 6, a through slot 12 is arranged in the middle of each fixed block 11; a wedge block 13, a strip-shaped slot 14 corresponding to the through slot 12 is arranged on the wedge block 13, the wedge block 13 is movably buckled with the fixed block 11 through the strip-shaped slot 14; one side of the wedge block 13 is arc-shaped, the arc surface shape of the wedge block 13 is matched with the inner wall of the trapezoidal cross section of the paper outlet 8; a spring, one end of the spring is connected with the inner side of the through slot 12, and the other end of the spring is connected with the wedge block 13, so that the wedge block 13 elastically expands and contracts in the through slot 12 of the fixed block 11; a paper tube 7, the upper and lower ends of each paper tube 7 are rotatably connected with the wedge block 13; a rotating wheel 23 is arranged at the front end of the wedge block 13, an annular slide is arranged on the inner wall of the reel 5 corresponding to the rotating track of the wedge block 13, and the wedge block 13 slides in the annular slide through the rotating wheel 23.

[0031] Specifically, the side wall of the reel 5 is provided with the paper outlet 8 along the length direction thereof, the cross section of the paper outlet 8 is designed as trapezoidal, and the opening width gradually shrinks from inside to outside, so that the paper outlet 8 can guide the drawing paper to be output in a fixed direction, and also cooperate with the wedge block 13 to perform a guiding expansion and contraction action.

[0032] The rotating discs 9 capable of freely rotating are arranged on the upper and lower sides of the inner cavity of the reel 5, the upper and lower rotating discs 9 are connected by the center rod 6 to realize synchronous transmission; the protruding block 10 is fixedly connected to the outer side of the rotating disc 9 on the upper side, the rotating disc 9 on the upper side is directly driven to rotate by rotating the protruding block 10, and the rotating disc 9 on the lower side is further driven to rotate synchronously by the center rod 6, and the fixed block 11 connected to the center rod 6 moves circumferentially with the rotation of the upper and lower rotating discs 9; meanwhile, the through slot 12 is arranged in the middle of the fixed block 11, and the wedge block 13 is movably buckled; the strip-shaped slot 14 in the middle of the wedge block 13 is connected with the through slot 12 of the fixed block 11, one end of the wedge block 13 is elastically supported by the spring arranged in the through slot 12, so that the wedge block 13 can elastically expand and contract along the through slot 12 under the limitation of the fixed block 11.

[0033] The principle of the second embodiment is as follows: the center rod 6 is driven to rotate by rotating the protruding block 10, the fixed block 11 is then moved in the circumferential direction, and the movable connecting wedge block 13 is then popped out in the direction of the paper outlet 8 under the elastic action of the spring; the protruding block 10 is continuously rotated, and when the arc surface side of the wedge block 13 gradually contacts the inner wall of the trapezoidal section of the paper outlet 8, the arc surface of the wedge block 13 forms a close abutment with the inner wall of the paper outlet 8, thereby providing a guiding action; with the abutment guiding action, the wedge block 13 completes a continuous reciprocating motion from popping out to retracting, that is, the paper tubes 7 containing different drawing papers in the roll 5 can be sequentially stretched out of the paper outlet 8 by rotating the external protruding block 10, so as to selectively extract corresponding paper according to the drawing style. Through the cooperation among the fixed block 11, the wedge block 13 and the paper tube 7, the operation convenience and the multifunctionality of drawing creation are greatly improved.

[0034] In addition, in order to further improve the movement stability and structural reliability of the wedge block 13, a rotating wheel 23 is further arranged at the front end of the wedge block 13, which slides in the annular slide arranged along the movement track of the wedge block 13 on the inner wall of the roll 5. Through the auxiliary guidance of the slide, the wedge block 13 and the paper tube 7 connected thereto always maintain a stable position during movement, thereby effectively avoiding the problem that the drawing paper extraction is blocked due to component shaking or poor sliding.

[0035] Further, the limiting device comprises: a limiting frame 15, the limiting frame 15 is arranged on the two sides of the end surface of the support plate 1, and a plurality of limiting grooves 16 are arranged on the limiting frame 15; a support rod 17, one end of the support rod 17 is hingedly connected to the back surface of the drawing board 3, the other end of the support rod 17 is connected with a connecting rod 18, and the connecting rod 18 is clamped in the limiting groove 16 through the connecting rod 18.

[0036] Specifically, the limiting frame 15 is symmetrically arranged on the two sides of the end surface of the support plate 1, and a plurality of limiting grooves 16 with different angular intervals are arranged on the limiting frame 15 along the length direction of the limiting frame 15. When the user needs to adjust the angle of the drawing board 3, the position of the support rod 17 and the connecting rod 18 is adjusted, so that the connecting rod 18 is selectively embedded in the limiting groove 16 with different angles, thereby realizing the rapid adjustment of the inclination angle of the drawing board 3 relative to the support plate 1.

[0037] Further, the placing frame 19 for placing the roll 5 is arranged on the two sides of the back surface of the drawing board 3, the hinge 20 is rotatably arranged in the placing frame 19, and the hinge 20 is clamped and matched with the roll 5, so that the roll 5 can be folded to the back side of the drawing board 3 through the hinge 20 for storage.

[0038] It is to be understood that the structures, proportions, sizes, etc. shown in the drawings of the present disclosure are merely used to illustrate the content disclosed in the present disclosure, to be understood and read by those skilled in the art, and are not used to limit the conditions for implementing the present application, and therefore do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technology disclosed in the present application.

[0039] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A drawing device, characterized by The drawing device comprises: A support plate (1) is provided with an end face; a groove (2) is arranged at the front end of the support plate (1); a drawing board (3) is hingedly connected to the groove (2) through a rotating rod (4), and the back side of the drawing board (3) is adjusted in an inclined angle with the end face of the support plate (1) through a limiting device; a roller (5) is detachably connected to the side of the drawing board (3), the inner cavity of the roller (5) is coaxially arranged with a center rod (6), and a plurality of paper tubes (7) are arranged on the roller (5) in a length direction; each of the paper tubes (7) is respectively wound with drawing paper with different textures and thicknesses, and the plurality of paper tubes (7) are integrally arranged in the roller (5); a paper outlet (8) is arranged on the roller (5) for drawing the drawing paper, and the drawing paper on different paper tubes (7) is selectively drawn through the paper outlet (8). The roller (5) comprises: A center rod (6) is arranged at the center of the roller (5); 2. A drawing device according to claim 1, wherein A plurality of coaxial annular paper tubes (7) are sequentially arranged on the outer periphery of the center rod (6) from the inside to the outside, the diameters of the paper tubes (7) are gradually increased, the paper tubes (7) are arranged in a stepped manner, and a multi-layer nested laminated structure is formed; a ring-shaped interlayer is arranged on each of the paper tubes (7), and the drawing paper is arranged in the ring-shaped interlayer; A paper outlet (8) is arranged on the same side of the plurality of paper tubes (7) and corresponds to the ring-shaped interlayer. The roller (5) comprises: A paper outlet (8) is arranged on the side wall of the roller (5) in a length direction, and the paper outlet (8) has a trapezoidal cross section, that is, the opening width is gradually reduced from the inside to the outside; 3. A drawing device according to claim 1, wherein A rotating disc (9) is arranged on the upper and lower sides of the inner cavity of the roller (5), and the two rotating discs (9) are connected by the center rod (6); the rotating disc (9) arranged on the upper side is fixedly connected with a protrusion (10) on the outside; A plurality of fixed blocks (11) are arranged on the upper and lower parts of the center rod (6) in a circumferential direction, and a through slot (12) is arranged in the middle of each of the fixed blocks (11); A wedge block (13) is arranged on one side of each of the fixed blocks (11) and corresponds to the through slot (12); a strip-shaped slot (14) is arranged on the wedge block (13) and corresponds to the through slot (12); the wedge block (13) is movably connected with the fixed block (11) through the strip-shaped slot (14); one side of the wedge block (13) is arc-shaped, and the arc-shaped surface of the wedge block (13) is matched with the inner wall of the trapezoidal cross section of the paper outlet (8); A spring is connected between the inside of the through slot (12) and the wedge block (13) to elastically stretch and contract the wedge block (13) in the through slot (12) of the fixed block (11); Each of the paper tubes (7) is rotatably connected to the wedge block (13). The limiting device comprises: A limiting frame (15) is arranged on both sides of the end face of the support plate (1); a plurality of limiting grooves (16) are arranged on the limiting frame (15); 4. A drawing device according to claim 1, wherein A support rod (17) is hingedly connected to the back of the drawing board (3) at one end, and a connecting rod (18) is connected to the other end of the support rod (17) and is clamped in the limiting groove (16). ​ ​ 5. A drawing device as claimed in claim 1, characterized in that The back of the drawing board (3) is provided with a rack (19) for placing the roll (5), and a hinge (20) is rotatably arranged in the rack (19) and is in clamping engagement with the roll (5).

6. A drawing device as claimed in claim 1, characterized in that A base (21) is arranged below the drawing board (3) and is connected with the drawing board (3) through an extension rod (22).

7. A drawing device according to claim 3, wherein The front end of the wedge (13) is provided with a rotating wheel (23), and an annular slide is arranged on the inner wall of the roll (5) and corresponds to the rotating track of the wedge (13), and the wedge (13) slides in the annular slide through the rotating wheel (23).

8. A drawing device as claimed in claim 1, characterized in that A convex part is arranged at the bottom edge of the drawing board (3), and the convex part and the surface of the drawing board (3) form an L-shaped slot, and the L-shaped slot is used for placing a brush.

Citation Information

Patent Citations

  • Drawing device

    CN219479508U