Round mapper for drawing circles

Abstract

The utility model provides a circle drawing device for drawing circles, which comprises a body, a sliding chute is arranged in the middle of the body, a circle center positioning component is arranged in the sliding chute and can translate along the track of the sliding chute or is in positioning connection with the sliding chute, one end of the body is provided with a drawing component, and the other end of the body is connected with the drawing component. The drawing assembly can detachably clamp a drawing pen; when the circle center positioning assembly is in positioning connection with the sliding groove, the body can rotate around the central axis of the circle center positioning assembly. The drawing pen is detachably and stably clamped through the funnel-shaped positioning clamping piece on the upper positioning clamping sleeve and the split type clamping piece on the lower positioning clamping sleeve, the circle center positioning assembly is matched, the circle drawing stability can be improved, and operation is easy.

Description

Technical Field

[0001] This utility model relates to the field of drafting tools, specifically to a circular drafting tool for drawing circles. Background Technology

[0002] A circle plotter is a drafting tool used to draw circles. Common circle plotters include compasses.

[0003] A Chinese patent application with publication number CN109130626A discloses a teaching compass ruler, which includes a first compass ruler, a second compass ruler, and a center positioning mechanism. One end of the first compass ruler is hinged to one end of the second compass ruler. A first connecting block is tenoned to the end of the first compass ruler away from the second compass ruler. The surface of the first connecting block is circular. A clamping rod is tenoned to the end of the first connecting block away from the first compass ruler. A fixing ring is sleeved on the surface of the first clamping rod.

[0004] The compass ruler in the existing technology is prone to deviation when drawing circles, resulting in unstable circle drawing, and there are areas for improvement. Utility Model Content

[0005] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a circular drawing tool for drawing circles.

[0006] According to the present invention, a circular drawing tool for drawing circles includes a body, a groove in the middle of the body, a center positioning component in the groove, the center positioning component being able to translate along the trajectory of the groove or be positioned and connected to the groove, and a drawing component at one end of the body, the drawing component being able to detachably hold a drawing pen; when the center positioning component is positioned and connected to the groove, the body is able to rotate around the central axis of the center positioning component.

[0007] Preferably, a plastic cap is provided at one end of the main body, and the plastic cap is provided with mounting holes;

[0008] The drawing assembly includes an upper positioning sleeve and a lower positioning sleeve, both of which are engaged with the side wall of the mounting hole. The upper positioning sleeve and / or the lower positioning sleeve are provided with elastic clips for holding the drawing pen, and the elastic clips allow the drawing pen to pass through the upper positioning sleeve and the lower positioning sleeve.

[0009] Preferably, the mounting hole on the plastic cover has a notch at its edge, and the upper positioning sleeve includes an annular outer ring with an outwardly turned positioning buckle that is adapted to the notch.

[0010] Preferably, the upper positioning clip further includes a funnel-shaped positioning clip disposed inside the annular outer ring, the diameter of the funnel-shaped positioning clip gradually decreasing from top to bottom, and the bottom of the funnel-shaped positioning clip having a channel that allows a drawing pen to pass through.

[0011] Preferably, the lower positioning sleeve includes an annular outer edge wall that engages with the mounting hole, and the other end of the annular outer edge wall extends toward the inside of the mounting hole and folds upward to form a segmented clip, the segmented clip forming a columnar structure surrounding the outer periphery of the drawing pen.

[0012] Preferably, the central axes of the upper positioning sleeve and the lower positioning sleeve are collinear.

[0013] Preferably, the main body is provided with a scale starting from the position of the drawing pen.

[0014] Preferably, the center positioning assembly includes a positioning post with a base, a fixing seat, a positioning piece, and an adjusting cap;

[0015] The fixing seat includes a base disposed below the slide groove and a hollow column with external threads. The fixing seat is rotatably sleeved on the positioning column, and the base of the fixing seat is disposed on the base of the positioning column.

[0016] The positioning piece is positioned above the slide groove, the adjusting cap is positioned on the upper surface of the positioning piece, and the hollow column of the positioning post and the fixing seat passes through the slide groove and the positioning piece in sequence upwards.

[0017] The internal thread of the adjusting cap is threadedly connected to the external thread of the hollow column in the fixed seat, so that the fixed seat, the base and the positioning piece are either tightly fitted or loosely fitted with the slide groove.

[0018] The top of the positioning column extends upward through the hollow column of the fixing seat and the adjusting cap.

[0019] Preferably, the positioning post is a hollow column that runs vertically through the top and bottom. A cap is fixedly connected to the top of the positioning post. The top surface of the cap is made of transparent material, and a center mark is provided on the top of the cap.

[0020] Preferably, the bottom of the positioning post is provided with an anti-slip pad.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This utility model uses a funnel-shaped positioning clip on the upper positioning sleeve and a segmented clip on the lower positioning sleeve to stably hold the drawing pen in a detachable manner. Combined with the center positioning component, it helps to improve the stability of drawing circles and is easy to operate. Attached Figure Description

[0023] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram illustrating the overall structure of the circular plotter, which is the main feature of this utility model.

[0025] Figure 2 This is an exploded view showing the overall structure of the circular plotter, which is the main feature of this utility model.

[0026] Figure 3 This is a cross-sectional view that mainly illustrates the overall structure of the cutter head assembly in this utility model;

[0027] Figure 4 This is an axonometric view of the overall structure of the cutter head assembly, which is the main feature of this utility model.

[0028] Figure 5 This is a schematic diagram of the bottom structure of the circular drafting device, which is the main feature of this utility model.

[0029] Figure 6 This is a schematic diagram of the axial section of the overall structure of the circular plotter, which is the main feature of this utility model.

[0030] Figure 7 This utility model mainly embodies a schematic diagram of a circular drafting device with a tangent circle.

[0031] Figure 8 This is a schematic diagram illustrating the overall structure of the circular drawing plotter of this utility model;

[0032] Figure 9 This is an exploded view showing the overall structure of the drawing component, which is the main feature of this utility model.

[0033] Figure 10 This is a schematic diagram of the axial section of the overall structure of the circular drawing plotter, which is the main feature of this utility model.

[0034] Figure 11 This utility model mainly embodies the schematic diagram of a circular drafting tool for drawing circles.

[0035] As shown in the figure:

[0036] Main body 1, Cap 26, Blade holder 53

[0037] Slide 11, Plastic cover 3, Spindle 531

[0038] Backrest 12, Slot 31, Spindle cover 532

[0039] Long arm 13, guide groove 32, screw 533

[0040] Reception area 131, extension plate 33, blade 534

[0041] Slider 132, Groove 331, Driven ramp 535

[0042] Hook 1321, Limiting stop bar 34, Compression spring 54

[0043] Lock block 141, rotating cover 35, mounting hole 61

[0044] Pressing part 142, screw 36, notch 611

[0045] Protrusion 143, Positioning part 37, Upper positioning sleeve 62

[0046] Bottom cover 144, push block 41, positioning buckle 621

[0047] Screw 145, Active ramp 42, Funnel-shaped positioning clip 622

[0048] Spring 146, Pin hole 43, Lower positioning sleeve 63

[0049] Middle baffle 15, cotter pin 44, annular outer edge wall 631

[0050] Positioning column 21, tool holder 51, segmented clamping plate 632

[0051] Anti-slip mat 22, blade opening 511, round 100

[0052] Fixture 23, Tool Post Cover 52, Circular 200

[0053] Positioning pad 24, Anti-slip protrusions 521, Drawing pen 201

[0054] Adjusting cap 25 Detailed Implementation

[0055] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0056] like Figures 1 to 11 As shown, a circular drawing tool that can be used for cutting and drawing circles according to the present invention includes a body 1. A groove 11 is provided in the middle of the body 1. A center positioning component is provided in the groove 11. The center positioning component can be translated along the trajectory of the groove 11 or positioned and connected with the groove 11.

[0057] One end of the main body 1 is detachably fitted with a paper cutting assembly, which includes an extendable or retractable blade 534.

[0058] Alternatively, a drawing component may be detachably mounted on one end of the main body 1, and the drawing component may be detachably clamped with a drawing pen 201.

[0059] Alternatively, a paper-cutting component may be detachably installed at one end of the main body 1, and a drawing component may be detachably installed at the other end of the main body 1.

[0060] It should be noted that the technical solution of this application uses a center positioning component to determine the rotation center of the circular drafting device, and the paper cutting component and / or drawing component are detachably installed at the end of the main body 1 to realize the paper cutting function or drawing function of the circular drafting device. When the center positioning component is positioned and connected with the slide 11, the main body 1 can rotate around the central axis 531 of the center positioning component.

[0061] It needs to be further explained that,

[0062] In one feasible implementation: the paper cutting component and the drawing component of this application can be designed as separate replaceable part modules. When the paper cutting function is required, the paper cutting component part module is fixedly connected to the end of the body 1. When the drawing function is required, the paper cutting component part module is first removed, and then the drawing component part module is fixedly connected to the end of the body 1.

[0063] In another feasible implementation: the paper cutting component and the drawing component are detachably mounted at both ends of the body 1.

[0064] In another feasible implementation: the paper cutting component and the drawing component are integrated into a single part module, and the part module having the paper cutting component and the drawing component is detachably connected to the end of the body 1.

[0065] It should be further noted that, in the above three embodiments, only the installation positions of the paper cutting component and the drawing component are different. The combination of the paper cutting component and the drawing component in other positions all fall within the protection scope of the technical solution of this application.

[0066] like Figures 1 to 7 As shown, specifically, the circular drafting device includes a body 1, with a groove 11 in the middle of the body 1. A center positioning component that allows a view of the bottom is disposed within the groove 11. A plastic cover 3 is detachably connected to one end of the body 1. The plastic cover 3 is provided with a paper cutting component for mounting the blade 534, and / or a drawing component for fixing the drawing pen 201. More specifically, the plastic cover 3 is arched and snapped into the end of the body 1. The end of the body 1 with the plastic cover 3 has a raised backrest 12, the outer contour of which is adapted to the arched plastic cover 3.

[0067] Furthermore, the center positioning assembly includes a positioning post 21 with a base, a fixing seat 23, a positioning piece 24, and an adjusting cap 25. The fixing seat 23 includes a base disposed below the slide groove 11 and a hollow column with external threads. The fixing seat 23 is coaxially rotatably sleeved on the positioning post 21, and the base of the fixing seat 23 is disposed on the base of the positioning post 21. The positioning piece 24 is disposed above the slide groove 11, and the adjusting cap 25 is disposed on the upper surface of the positioning piece 24. The hollow column of the positioning post 21 and the fixing seat 23 passes upward through the slide groove 11 and the positioning piece 24 in sequence. The internal thread of the adjusting cap 25 is threadedly connected to the external thread of the hollow column of the fixing seat 23, so that the fixing seat 23, the base, and the positioning piece 24 are tightly or loosely fitted with the slide groove 11; the top of the positioning post 21 extends upward through the hollow column of the fixing seat 23 and the adjusting cap 25.

[0068] In a preferred embodiment, the positioning post 21 is a hollow column that runs vertically through the center. A cap 26 is fixedly connected to the top of the positioning post 21. The top surface of the cap 26 is made of transparent material, and a center mark is provided on the top of the cap 26. This facilitates visual estimation of the center positioning point during use. In addition, an anti-slip pad 22 is provided at the bottom of the positioning post 21.

[0069] Furthermore, the main body 1 and the plastic cover 3 are detachably and fixedly connected via a locking assembly. The locking assembly includes a locking block 141, a pressing part 142, a protrusion 143, a spring 146, a middle baffle 15, and a groove 331. The middle baffle 15 is fixedly installed inside the main body 1, the locking block 141 is slidably disposed inside the main body 1, and the spring 146 is disposed between the locking block 141 and the middle baffle 15. The extension and retraction direction of the spring 146 is the same as the sliding direction of the locking block 141. The pressing part 142 is fixedly connected to the locking block 141, one end of the pressing part 142 extends out from inside the main body 1, the protrusion 143 is disposed on the pressing part 142 and / or the locking block 141, and the groove 331 is disposed on the plastic cover 3. Under the outward elastic force of the spring 146, the protrusion 143 of the locking block 141 remains locked to the groove 331, and the plastic cover 3 is fixedly connected to the body 1. Under the action of external force, the pressing part 142 moves inward to the body 1, causing the protrusion 143 to contact and lock with the groove 331, and the plastic cover 3 can be separated from the body 1. In order to improve the stability of the detachable structure, a set of locking components is provided on both sides of the width of the body 1. Specifically, the outer end of the locking block 141 is provided with a pressing part 142 that protrudes from the side wall of the body 1. A middle baffle 15 is provided in the middle of the bottom of the body 1, and springs 146 are respectively sandwiched between the middle baffle 15 and the inner ends of the two locking blocks 141. The edges of the pressing part 142 are provided with protrusions 143, and the two sides of the arched plastic cover 3 are provided with extension plates 33, and the extension plates 33 are provided with grooves 331 that match the protrusions 143. To prevent the locking assembly from falling off during use, a bottom cover 144 is provided at the bottom of the main body 1, and is fixed to the main body 1 by screws 36145. When the groove 331 engages with the protrusion 143, the plastic cover 3 is connected to the main body 1. When the pressing part 142 is subjected to an inward external force, the locking block 141 moves horizontally toward the middle baffle 15, and the protrusion 143 moves out of the groove 331. When the groove 331 and the protrusion 143 are loosened, the plastic cover 3 is loosened from the main body 1, and the arched plastic cover 3 can be separated from the main body 1 by pulling it horizontally.

[0070] Furthermore, the end of the main body 1 where the plastic cover 3 is installed is provided with a long arm 13, which extends into the plastic cover 3. A slide bar 132 extending along the length of the main body 1 is provided on the outer wall of the long arm 13. A guide groove 32 adapted to the slide bar 132 is provided on the inner wall of the plastic cover 3. A limit stop 34 is provided at the end of the guide groove 32 near the main body 1, and a hook 1321 is provided at the end of the slide bar 132 away from the main body 1. The hook 1321 and the limit stop 34 mutually limit each other along the length of the main body 1. To prevent the arched plastic cover 3 from falling off when loosely fitted to the main body 1 during partial disassembly (when replacing the cutter head assembly), a limit stop 34 is provided at the outer end of the guide groove 32, and a hook 1321 adapted to the limit stop 34 is provided at the free end of the slide bar 132. Because the arched plastic cover 3 has a certain degree of flexibility, when it is necessary to completely disassemble (when replacing the functional group), the side wall of the arched plastic cover 3 can be pried open to the outside to completely separate the limiting strip 34 from the hook 1321.

[0071] Furthermore, a long arm 13 is provided at the end of the main body 1, extending into the plastic cover 3. A receiving area 131 is provided in the internal area of ​​the long arm 13 extending into the plastic cover 3. The paper cutting assembly includes a blade assembly and a push block 41. The blade assembly is installed in the receiving area 131 of the long arm 13. The blade assembly includes a blade holder 51, a blade holder cover 52, and a blade holder 53. A central cavity for accommodating the blade holder 53 is formed between the blade holder 51 and the blade holder cover 52. A compression spring 54 is provided between the blade holder 53 and the blade holder 51. The extension and retraction direction of the compression spring 54 is the direction in which the blade holder 53 moves away from or closer to the bottom of the blade holder 51. A portion of the blade holder 53 extends out of the central cavity. The portion of the blade holder 53 located in the central cavity is fixed with a blade 534. The bottom of the blade holder 51 is provided with an outlet 511 that allows the blade 534 to extend or retract. A driven ramp 535 is formed on the portion of the blade holder 53 extending out of the central cavity. A push block 41 is movably mounted on the plastic cover 3, with its bottom extending into the interior of the cover. An active ramp 42 is formed at the bottom of the push block 41, contacting a driven ramp 535. The active ramp 42 and driven ramp 535 work together to push the blade holder 53 towards the bottom of the blade holder base 51, compressing the compression spring 54. As the push block 41 moves on the plastic cover 3, the active ramp 42 and driven ramp 535 move relative to each other, pushing the blade holder 53 towards the bottom of the blade holder base 51, extending the blade 534 from the blade outlet 511, and compressing the compression spring 54. When the push block 41 returns to its original position, the compression spring 54 returns to its original position, and the blade holder 53 moves upward under the action of the compression spring 54, retracting the blade 534 from the blade outlet 511. A positioning part 37 is provided on the plastic cover 3, and the paper cutting assembly also includes a rotating cover 35, which is fixed to the positioning part 37.

[0072] In one feasible embodiment: the paper cutting assembly includes a blade assembly, a push block 41, and a rotating cover 35. The top of the plastic cover 3 includes a slot 31 for inserting the push block 41 and a positioning part 37 for fixing the rotating cover 35, which is fixed to the positioning part 37 by screws 36. The bottom of the push block 41 extends through the slot 31 into the interior of the rotating cover 35 and is opposite to the blade assembly. The push block 41 located inside the plastic cover 3 is provided with a pin hole 43, and a cotter pin 44 is inserted into the pin hole 43 of the push block 41 to prevent the push block 41 from falling out. After the push block 41 is inserted into the arched plastic cover 3, the cotter pin 44 is inserted into the pin hole 43 of the push block 41 to prevent the push block 41 from falling out. The bottom of the push block 41 forms an active ramp 42, and the surface of the blade assembly opposite to the active ramp 42 is provided with a driven ramp 535. When the push block 41 moves horizontally, the active ramp 42 pushes the driven ramp 535, causing the blade 534 on the cutter head assembly to extend out from the bottom of the body 1, enabling circular cutting. Specifically, the cutter head assembly includes a cutter holder 51 and a cutter holder cover 52. A central cavity is formed between the cutter holder 51 and the cutter holder cover 52, and a blade holder 53 is placed inside the central cavity. One end of the blade holder 53 is provided with a spindle 531, and the blade 534 is clamped by the spindle 531 and the spindle cover 532. The spindle 531 and the spindle cover 532 are connected by screws 533. In addition, the other end of the blade holder 53, located outside the central cavity, forms a driven ramp 535. A compression spring 54 is provided between the inner wall of the blade holder 53 at the lower part of the driven ramp 535 and the bottom wall of the cutter holder 51. The bottom of the cutter holder 51 is provided with a blade outlet 511. The active ramp 42 pushes the driven ramp 535 downward, causing the blade holder 53 to move downward relative to the blade holder seat 51, thus exposing the lower edge of the blade 534 at the blade exit 511. In this embodiment, the blade 534 can be replaced with different styles as needed. For easy replacement, anti-slip protrusions 521 are provided at both ends of the blade holder cover 52. Furthermore, a scale with the blade 534 as the starting point is provided on the main body 1, facilitating radius positioning according to the size of the circle to be cut. In use, push the push block 41 to extend the blade 534 downward, loosen the adjusting cap 25, slide the center positioning component to the desired radius position, and tighten the adjusting cap 25 again to lock the center positioning component, anchoring the radius size. Press down on the cap 26 with one hand to position the center, while simultaneously holding the rotating cover 35 with the other hand, causing the main body 1 to rotate around the center positioning component, cutting the circle 100.

[0073] like Figures 8 to 11As shown, the drawing assembly further includes an upper positioning sleeve 62 and a lower positioning sleeve 63. The plastic cover 3 is provided with a mounting hole 61. Both the upper positioning sleeve 62 and the lower positioning sleeve 63 are engaged with the side wall of the mounting hole 61. The upper positioning sleeve 62 and / or the lower positioning sleeve 63 are provided with elastic clips for holding the drawing pen 201, and the elastic clips allow the drawing pen 201 to pass through the upper positioning sleeve 62 and the lower positioning sleeve 63.

[0074] It should be noted that, in one feasible implementation, the product only needs a drawing function, which can fix the plastic cover to the end of the main body 1.

[0075] In one feasible implementation: Regarding the drawing assembly, the top of the plastic cover 3 is provided with a mounting hole 61 for engaging the upper positioning sleeve 62 and the lower positioning sleeve 63. A notch 611 is provided at the edge of the mounting hole 61. The upper positioning sleeve 62 includes an annular outer ring and a funnel-shaped positioning clip 622 disposed inside the annular outer ring; an outwardly folded positioning buckle 621 is provided on the annular outer ring, which is adapted to the notch 611, thereby realizing the engagement of the upper positioning sleeve 62 with the arched plastic cover 3. The lower positioning sleeve 63 includes an annular outer edge wall 631 that engages with the mounting hole 61, and the other end of the annular outer edge wall 631 extends toward the inside of the mounting hole 61 and folds upward to form a segmented clip 632, which forms a columnar structure surrounding the outer periphery of the drawing pen 201. The multiple U-shaped structures formed by the lower positioning sleeve 63 enable circumferential clamping of the drawing pen 201, adapting to pens of various sizes and structures while ensuring clamping force to prevent the drawing pen 201 from shifting vertically during use. Preferably, the central axes 531 of the upper positioning sleeve 62 and the lower positioning sleeve 63 are collinear, improving the stability of clamping the drawing pen 201. Furthermore, the main body 1 is provided with another scale starting from the position of the drawing pen, facilitating radius positioning according to the size of the circle to be drawn. In use, loosen the adjusting cap 25, slide the center positioning component to the desired radius position, and tighten the adjusting cap 25 again. Press down on the cap 26 with one hand to achieve center positioning, while simultaneously holding the drawing pen 201 with the other hand, causing the main body 1 to rotate around the center positioning component, thus completing the drawing of the circle 200.

[0076] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0077] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A circular plotter for drawing circles, characterized in that, The device includes a main body, a sliding groove in the middle of the main body, a center positioning component in the sliding groove, the center positioning component being able to translate along the trajectory of the sliding groove or be positioned and connected to the sliding groove, and a drawing component being provided at one end of the main body, the drawing component being able to detachably hold a drawing pen. When the center positioning component is connected to the slide groove positioning, the body can rotate around the central axis of the center positioning component.

2. The circular plotter for drawing circles as described in claim 1, characterized in that, A plastic cap is provided at one end of the main body, and the plastic cap is provided with mounting holes; The drawing assembly includes an upper positioning sleeve and a lower positioning sleeve, both of which are engaged with the side wall of the mounting hole. The upper positioning sleeve and / or the lower positioning sleeve are provided with elastic clips for holding the drawing pen, and the elastic clips allow the drawing pen to pass through the upper positioning sleeve and the lower positioning sleeve.

3. The circular plotter for drawing circles as described in claim 2, characterized in that, The mounting hole on the plastic cover has a notch at its edge, and the upper positioning sleeve includes an annular outer ring with an outwardly turned positioning buckle that is adapted to the notch.

4. The circular plotter for drawing circles as described in claim 3, characterized in that, The upper positioning sleeve also includes a funnel-shaped positioning clip disposed inside the annular outer ring. The diameter of the funnel-shaped positioning clip gradually decreases from top to bottom, and the bottom of the funnel-shaped positioning clip has a channel that allows a drawing pen to pass through.

5. The circular plotter for drawing circles as described in claim 2, characterized in that, The lower positioning sleeve includes an annular outer edge wall that engages with the mounting hole. The other end of the annular outer edge wall extends toward the inside of the mounting hole and folds upward to form a segmented clamping piece. The segmented clamping piece forms a columnar structure that surrounds the outer periphery of the drawing pen.

6. The circular plotter for drawing circles as described in claim 2, characterized in that, The central axes of the upper positioning sleeve and the lower positioning sleeve are collinear.

7. The circular plotter for drawing circles as described in claim 1, characterized in that, The main body is equipped with a scale starting from the position of the drawing pen.

8. The circular plotter for drawing circles as described in claim 1, characterized in that, The center positioning assembly includes a positioning post with a base, a fixing seat, a positioning piece, and an adjusting cap; The fixing seat includes a base disposed below the slide groove and a hollow column with external threads. The fixing seat is rotatably sleeved on the positioning column, and the base of the fixing seat is disposed on the base of the positioning column. The positioning piece is positioned above the slide groove, the adjusting cap is positioned on the upper surface of the positioning piece, and the hollow column of the positioning post and the fixing seat passes through the slide groove and the positioning piece in sequence upwards. The internal thread of the adjusting cap is threadedly connected to the external thread of the hollow column in the fixed seat, so that the fixed seat, the base and the positioning piece are either tightly fitted or loosely fitted with the slide groove. The top of the positioning column extends upward through the hollow column of the fixing seat and the adjusting cap.

9. The circular plotter for drawing circles as described in claim 8, characterized in that, The positioning post is a hollow column that runs vertically through the top and bottom. A cap is fixedly connected to the top of the positioning post. The top surface of the cap is made of transparent material, and a center mark is provided on the top of the cap.

10. The circular plotter for drawing circles as described in claim 8, characterized in that, The bottom of the positioning post is provided with an anti-slip pad.

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