Ellipse ruler for drawing ellipse through stepless adjustment of semi-automatic take-up device

Abstract

The invention provides an ellipse ruler for drawing ellipses through stepless adjustment of a semi-automatic take-up device, and relates to the technical field of drawing tools, the ellipse ruler comprises a length-adjustable main ruler assembly used for providing a focal length stepless adjustment frame, and the main ruler assembly is provided with a scale adjustment device; the auxiliary ruler assembly is movably connected with the main ruler assembly through a rotary connecting device and can rotate around the central point of the main ruler assembly; the take-up pen assembly is movably connected with the auxiliary ruler assembly through a sliding connecting device and connected to the main ruler assembly through a rope loop, and the take-up pen assembly is provided with a length adjusting device used for adjusting the length of the rope loop in a stepless mode so as to draw ellipses with different parameters. The problem of large errors is solved by adopting stepless adjustment; all the components can be flexibly adjusted, the length of the rope loop is adjusted through the semi-automatic take-up device to adapt to different ellipse parameters, use is convenient, and precision is high.

Description

Technical Field

[0001] This invention belongs to the field of drawing tools technology, specifically relating to an elliptical ruler for drawing ellipses using a semi-automatic line take-up device with stepless adjustment. Background Technology

[0002] Ellipse drawing tools are a very common traditional hand-drawing tool, widely used in architectural drawings, mechanical drawings, precise geometric drawing, and scenarios that require strict adherence to the mathematical definition of an ellipse. An ellipse compass is often used, which consists of two vertical rods (horizontal and vertical axes), a slider, and a pen holder. By adjusting the lengths of the horizontal and vertical axes (corresponding to the major and minor axes of the ellipse), the slider moves and drives the pen to draw an ellipse.

[0003] In practical use, it has been found that although elliptic compasses can draw general ellipses and can draw ellipses of different sizes by adjusting the lengths of the horizontal and vertical axes, the adjustment accuracy is low, the adjustment method is inflexible, and the adjustment through multiple equally spaced holes results in large errors and is inconvenient for drawing. To solve the above problems, this application proposes an elliptic ruler for drawing ellipses with stepless adjustment using a semi-automatic winding device. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides an elliptical ruler for drawing ellipses using a semi-automatic winding device with stepless adjustment, which is convenient to use and has high adjustment accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an elliptical ruler for drawing ellipses using a semi-automatic winding device with stepless adjustment, comprising: An adjustable main scale assembly is used to provide a frame for stepless focal length adjustment, and the main scale assembly is equipped with a scale adjustment device; The auxiliary ruler assembly is movably connected to the main ruler assembly via a rotating connection device and can rotate around the center point of the main ruler assembly; The retractable pen assembly is movably connected to the auxiliary ruler assembly via a sliding connection device and connected to the main ruler assembly via a rope loop. The retractable pen assembly is equipped with a length adjustment device for steplessly adjusting the length of the rope loop to draw ellipses with different parameters.

[0006] Preferably, the main scale assembly includes: A connecting plate with a first guide hole; A first scale extending along the length direction, the first scale having continuous scale lines and special scale lines on the main scale, a hole at the top center of the first scale, and the first scale fixed to the connecting plate; Two symmetrically distributed adjustment rulers are movably connected to the connecting plate and fixed at any position of the first scale ruler by a scale adjustment device. The inner wall of the adjustment ruler is provided with a first fixing post for fixing the first bearing, and the outer wall of the adjustment ruler is provided with a slot for the rope loop to be inserted.

[0007] Preferably, the scale adjustment device includes: The first bolt has an inner cavity inside the adjusting ruler for the connecting plate and the first scale to be embedded, and a hexagonal inner groove for fixing the nut is provided at the lower part of the inner cavity. The first bolt passes through the first through hole and the first guide sliding hole of the adjusting ruler. A nut is fixed in the hexagonal inner groove and is threadedly engaged with the protruding end of the first bolt.

[0008] Preferably, the auxiliary ruler assembly includes: A second scale with a second guide sliding hole is provided. The second scale has auxiliary continuous scale lines and auxiliary special scale lines. The second scale is rotatably connected to the first scale through the rotating connection device. The locking block has a plug-in block at one end, and the second scale has a plug-in interface at one end that is compatible with the plug-in block.

[0009] Preferably, the rotating connection device includes: The second bearing and the second bolt pass through the second bearing and are screwed to the first scale through the hole. The second bearing is adapted to the second guide hole. The second bolt is also used to restrict the vertical movement freedom of the second scale.

[0010] Preferably, the line-retracting pen assembly includes: The outer shell has a cavity, the length adjustment device is disposed in the cavity, the front end of the outer shell has a second through hole, the lower end has a third through hole, the middle of the inner side of the outer shell has a second fixing post, the outer shell has an installation cavity, and the installation cavity has a fourth through hole. An end cap is fixed to the opening end of the outer shell by self-tapping screws through screw holes, and the upper part of the end cap is provided with the sliding connection device; A third fixing post is fixed to the top of the end cap, and the interior of the third fixing post is a hollow structure; An automatic lead structure, wherein the automatic lead structure passes sequentially through the interior of the third fixing post, the middle of the rope loop, and the third through hole, and is fixed to the end cap by the threaded structure of the pen tip and the pen barrel; A rotating cylinder that is loosely fitted outside the third fixed column.

[0011] Preferably, the sliding connection device includes: The card plate is slidably connected to the second scale through the second guide hole; The limiting block is adapted to the second scale to restrict the horizontal movement freedom of the second scale, and the locking platform cooperates with the limiting block to restrict the vertical movement freedom of the second scale.

[0012] Preferably, the length adjustment device includes: A bidirectional ratchet, wherein the bidirectional ratchet is loosely fitted onto the second fixed post through the fifth through hole in the middle to form a rotating structure; The inner hook and outer clamp spring is placed on the inner ring of the bidirectional ratchet, with one end hooked inward to the second fixing post and the other end extending out into the sixth through hole of the bidirectional ratchet; one end of the rope loop is clamped at the outer clamp of the inner hook and outer clamp spring and wound around the outer ring of the bidirectional ratchet, and the other end extends out through the second through hole of the outer shell and is sleeved in the slot. An insertion block is slidably disposed within the mounting cavity. The insertion block includes a locking block, a fourth fixing post, and a contact block. The locking block is engaged with the tooth gap of the bidirectional ratchet through the fourth through hole. A reset spring is located between the inner wall of the mounting cavity and the insertion block, and is fixed to the fourth fixing post of the insertion block; A switch is rotatably disposed inside the mounting cavity and outside the insertion block. The switch is provided with an opening operation block, an closing operation block, and a rocker arm. A baffle, fixed to the front end of the end cap, is used to restrict the movement of the switch in the horizontal direction.

[0013] Preferably, the first bearing is interference-fitted onto the first fixing post, and the outer diameter of the first bearing is equal to the width of the outer end of the slot; The drawing pen assembly draws by rotating the rope loop in the slot while keeping it taut, and the first bearing rotates together with the rope loop; The rotating cylinder is loosely fitted outside the third fixed column. When drawing, the rotating cylinder is held in hand and rotates around the third fixed column.

[0014] Preferably, the bottom surface of the connecting plate is provided with a first mark for marking the coordinate axis, and the top end of the adjusting ruler is provided with a second mark for marking the coordinate axis; the outer wall of the adjusting ruler is provided with a third mark for aligning the main scale continuous graduation lines and the main scale special graduation lines on the first scale; the locking block is provided with a fourth mark for aligning the marked coordinate axis; and the upper part of the end cap is provided with a fifth mark for aligning the auxiliary scale continuous graduation lines and the auxiliary scale special graduation lines on the second scale.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the present invention uses stepless adjustment to replace the traditional hole position adjustment, which solves the problem of large error; each component can be flexibly adjusted, and the rope loop length can be adjusted steplessly through the semi-automatic winding device to adapt to different elliptical parameters, which is convenient to use and has high precision.

[0016] Other additional advantages and benefits of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is an exploded structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the main scale component structure of the present invention.

[0020] Figure 4 This is a front view of the exploded structure of the main scale component of the present invention.

[0021] Figure 5 This is a rear exploded view of the main scale assembly of the present invention.

[0022] Figure 6 This is a schematic diagram of the adjusting ruler structure of the present invention.

[0023] Figure 7 This is an exploded structural diagram of the auxiliary ruler assembly of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the line-retracting pen assembly of the present invention.

[0025] Figure 9 This is an exploded structural diagram of the line-retracting pen component of the present invention.

[0026] Figure 10 This is a schematic diagram of the internal structure of the outer shell of the present invention.

[0027] Figure 11 This is a schematic diagram of the external structure of the outer shell of the present invention.

[0028] Figure 12 This is a schematic diagram of the end cap structure of the present invention.

[0029] Figure 13 This is a schematic diagram of the bidirectional ratchet isometric structure of the present invention.

[0030] Figure 14 This is a schematic diagram of the insertion block structure of the present invention.

[0031] Figure 15This is a schematic diagram of the structure of the components installed in the cavity when the switch is in the open state of the present invention.

[0032] Figure 16 This is a schematic diagram of the structure of the components inside the mounting cavity when the switch is closed according to the present invention.

[0033] In the diagram: 1. Main scale assembly; 11. Connecting plate; 111. First guide slide hole; 112. First mark; 12. First scale; 121. Main scale continuous graduation line; 122. Main scale special graduation line; 123. Hole; 13. Adjusting scale; 131. Inner cavity; 132. First through hole; 133. Second mark; 134. First fixing post; 135. Slot; 136. Hexagonal inner groove; 137. Third mark; 14. First bolt; 15. Nut; 16. First bearing; 17. Second bearing; 18. Second bolt; 2. Auxiliary scale assembly; 21. Second scale; 211. Second guide slide hole; 212. Insertion interface; 213. Auxiliary scale continuous graduation line; 214. Auxiliary scale special graduation line; 22. Locking block; 221. Fourth mark; 222. Insertion block 3. Lead-up pen assembly; 31. Outer shell; 311. Mounting cavity; 312. Second through hole; 313. Second fixing post; 314. Third through hole; 315. Fourth through hole; 32. End cap; 321. Locking platform; 322. Fifth mark; 323. Limiting block; 324. Baffle; 325. Third fixing post; 326. Screw hole; 33. Bidirectional ratchet; 331. Fifth through hole; 332. Inner ring; 333. Outer ring; 334. Sixth through hole; 335. Gap; 34. Inner hook and outer lock spring; 35. Automatic lead structure; 36. Switch; 361. Opening operation block; 362. Closing operation block; 363. Rocker arm; 37. Insertion block; 371. Locking block; 372. Fourth fixing post; 373. Contact block; 38. Return spring; 39. Rotating cylinder; 4. Rope loop. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-16 The present invention provides the following technical solution: an elliptical ruler for drawing ellipses with stepless adjustment using a semi-automatic thread take-up device, comprising: a main ruler assembly 1 with adjustable length, an auxiliary ruler assembly 2, a thread take-up pen assembly 3, and a rope loop 4.

[0036] Among them, further, by Figures 1-5 , Figures 7-9As shown in this embodiment, the main ruler assembly 1 has an adjustable length and is equipped with a scale adjustment device to provide a frame for stepless focal length adjustment; the auxiliary ruler assembly 2 is movably connected to the main ruler assembly 1 through a rotating connection device and can rotate around the center point of the main ruler assembly 1; the line take-up pen assembly 3 is movably connected to the auxiliary ruler assembly 2 through a sliding connection device and is connected to the main ruler assembly 1 through a rope loop 4. The line take-up pen assembly 3 is equipped with a length adjustment device to steplessly adjust the length of the rope loop 4 to draw ellipses with different parameters.

[0037] After adopting the above scheme, when in use, the main ruler component 1, the auxiliary ruler component 2, and the line-drawing pen component 3 are movably connected to form the entire ellipse drawing tool. First, the user adjusts the length of the main ruler component 1 according to the focal length of the ellipse to be drawn, which determines the focal length of the ellipse.

[0038] The length of the main scale assembly 1 is adjustable, and stepless adjustment is achieved through its own scale adjustment device. By aligning the third mark 137 on the outer wall of the adjustment scale 13 with the main scale continuous scale line 121 or the main scale special scale line 122 on the first scale, the precise focal length can be determined. The user can adjust the main scale assembly 1 to a suitable length according to actual needs, and then fix it by tightening the first bolt 14, thereby determining the focal length of the entire ellipse.

[0039] Next, the auxiliary ruler assembly 2 and the main ruler assembly 1 are movably connected by a rotating connecting device. The auxiliary ruler assembly 2 can rotate around the center point of the main ruler assembly 1. After the length of the main ruler assembly 1 is determined and fixed, the user can adjust the relative position between the auxiliary ruler assembly 2 and the main ruler assembly 1 according to the other parameter of the ellipse (major axis length or minor axis length). (Note: If the known quantity is the major axis length, the auxiliary ruler assembly 2 and the main ruler assembly 1 need to be kept in a horizontal position; if the known quantity is the minor axis length, the auxiliary ruler assembly 2 and the main ruler assembly 1 need to be kept in an orthogonal position.) By aligning the fifth mark on the upper part of the end cap 32 with the auxiliary ruler continuous scale line 213 or the auxiliary ruler special scale line 214 on the second scale 21, the precise position of the line-retracting pen assembly 3 can be determined. (Note: In this invention, there is no positioning and locking device between the auxiliary ruler assembly 2 and the line-retracting pen assembly 3. The adjusted position is positioned by the scale on the auxiliary ruler assembly 2, and the adjusted 2a is fixed by the rope loop 4) to form a suitable drawing frame structure.

[0040] The retractable pen assembly 3 is movably connected to the auxiliary ruler assembly 2 via a sliding connection device, and is connected to the main ruler assembly 1 via a rope loop 4. When it is necessary to draw ellipses with different parameters, the user can adjust the length of the rope loop 4 via the length adjustment device of the retractable pen assembly 3. During the adjustment process, the length adjustment device can precisely change the effective length of the rope loop 4 to meet the needs of drawing different ellipses.

[0041] In the actual drawing process, the focal length is determined by first determining the length of the main scale component 1, and then the effective length of the rope loop 4 is determined by determining the position of the lead-in pen component 3 on the auxiliary scale component 2. At the same time, the effective length of the rope loop 4 is fixed by the length adjustment device of the lead-in pen component 3, thereby satisfying the geometric definition of an ellipse (the locus of points in a plane whose sum of distances to two fixed points is equal to a constant). By adjusting the positions of the main scale component 1 and the auxiliary scale component 2 and adjusting the length of the rope loop 4, ellipses with different parameters can be drawn accurately. While stepless adjustment is achieved, precise adjustment is realized through scale markings.

[0042] Throughout the process, the scale adjustment device and the rotating connection device ensure that the positions of the main scale assembly 1 and the auxiliary scale assembly 2 can be precisely set, thereby guaranteeing the parameter accuracy of drawing the ellipse. The length adjustment device of the take-up pen assembly 3 realizes flexible control of the length of the rope loop 4. The sliding connection device is used to control the position of the take-up pen assembly 3 on the auxiliary scale assembly 2 (when the main scale assembly 1 and the auxiliary scale assembly 2 are in a horizontal state, the distance between the rotation points of the take-up pen assembly 3 and the auxiliary scale assembly 2 determines the length of the major axis; when the main scale assembly 1 and the auxiliary scale assembly 2 are in an orthogonal state, the distance between the rotation points of the take-up pen assembly 3 and the auxiliary scale assembly 2 determines the length of the minor axis). This makes the drawing tool adaptable to various ellipse drawing needs, with wide applicability and convenience. For example, it can be used for students to draw ellipses, to draw ellipses in mechanical parts sketch design, to draw ellipses in architectural design sketches, and to draw ellipses in mid-to-low-end decoration, with an error of ±1mm.

[0043] Optionally, by Figures 1-6 As shown, in this embodiment, the main scale assembly 1 includes: a connecting plate 11 with a first guide sliding hole 111; a first scale 12 extending along the length direction and fixed to the connecting plate 11, with a hole 123 at the top center; and two symmetrically distributed adjusting scales 13, which are movably connected to the connecting plate 11 and fixed to any position of the first scale 12 by a scale adjustment device. The inner wall of the adjusting scale 13 is provided with a first fixing post 134 for fixing the first bearing 16, and the outer wall of the adjusting scale 13 is provided with a slot 135 for embedding the rope loop 4.

[0044] After adopting the above scheme, when it is necessary to set the focal distance of the ellipse (i.e., the distance 2c between the two focal points), the user first loosens the first bolt 14. Due to the design of the first guide sliding hole 111 on the connecting plate 11, the left and right symmetrical adjustment ruler 13 can slide in a straight line without shaking along the length direction of the first scale ruler 12, and its sliding trajectory is strictly parallel to the reference axis of the first scale ruler 12.

[0045] Users can observe the scale lines on the first scale 12 (the first scale 12 has scale lines on both the side and top, including continuous and special scales; the scale values ​​gradually increase from the center to both sides; the special scales are common square root values, such as...). , (etc.), slide the left and right adjustment rulers 13 to symmetrical positions respectively (such as the left adjustment ruler 13 aligning with scale c, the right adjustment ruler 13 aligning with scale c (forming a gap 2c). Since the adjustment rulers 13 are movably connected to the connecting plate 11, when sliding, you can apply a pulling force (pushing force) with your fingers to make the two adjustment rulers 13 move away from (closer to) the center point.

[0046] Once the adjusting ruler 13 reaches the target scale, tighten the first bolt 14 to make the third mark 137 of the adjusting ruler 13 fit tightly against the scale reference surface of the first scale ruler 12.

[0047] The groove 135 on the outer wall of the adjusting ruler 13 adopts a V-groove design. The groove width is precisely matched with the diameter of the rope loop 4. When the rope loop 4 is tensioned, the inclined structure of the groove 135 will generate radial friction force to prevent the rope loop 4 from slipping or shifting during the drawing process.

[0048] The slots 135 of the left and right adjustment rulers 13 are strictly symmetrical to the center point of the connecting plate 11, ensuring that the two focal points are always located on the central axis of the main ruler, and the distance can be infinitely changed by adjusting the position of the adjustment rulers 13.

[0049] This design allows the main scale assembly 1 to change the focal distance 2c by sliding the adjusting scale 13. When drawing ellipses with different parameters (e.g., an ellipse with a focal length of 2c = 60mm and a major axis of 2a = 100mm), the user only needs to align the third mark 137 of the two symmetrical adjusting scales 13 to 30mm from the first scale 12, tighten the first bolt 14 to fix it, then adjust the auxiliary scale assembly 2 to be horizontal with the main scale assembly 1, and then align the fifth mark 322 of the reel assembly 3 to 50mm from the second scale 21. The length of the rope loop 4 is then fixed using the length adjustment device of the reel assembly 3. At this point, the effective length of the rope loop 4 is 2a = 100mm (meeting the requirements). Where a is the major semi-axis, b is the minor semi-axis, and c is the focal length, this ensures that the trajectory of the pen tip conforms to the geometric definition of an ellipse (i.e., ).

[0050] Optionally, by Figures 1-6 As shown, in this embodiment, the scale adjustment device includes: a first bolt 14, which passes through the first through hole 132 and the first guide sliding hole 111 of the adjustment scale 13; and a nut 15 fixed in the hexagonal inner groove 136, which is threadedly engaged with the protruding end of the first bolt 14.

[0051] After adopting the above scheme, when it is necessary to change the position of the adjusting ruler 13 to adjust the length of the entire main ruler assembly 1, a variable constraint mechanism between the adjusting ruler 13 and the main ruler connecting plate 11 is constructed through the threaded connection of the first bolt 14 and the nut 15.

[0052] The inner cavity 131 of the adjusting ruler 13 adopts a concave cross-section design, and its width is precisely matched with the combined thickness of the connecting plate 11 and the first scale 12, providing high-precision guidance for the linear sliding of the adjusting ruler 13.

[0053] When it is necessary to adjust the focal distance, the user first loosens the first bolt 14 so that it is no longer in contact with the end face of the adjusting ruler 13. The adjusting ruler 13 can then slide easily along the axis of the main ruler. The scale lines on the first scale 12 ensure that the distances adjusted by the left and right adjusting rulers 13 are consistent.

[0054] After adjustment, tighten the first bolt 14. The axial tension of the threaded pair forces the inner cavity 131 side wall of the adjusting ruler 13 to press against the guide surface of the connecting plate 11. At this time, a uniformly distributed frictional force is generated on the contact surface between the adjusting ruler 13 and the connecting plate 11, ensuring the stability after locking.

[0055] Optionally, by Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, the auxiliary ruler assembly 2 includes: a second scale 21 with a second guide sliding hole 211, the second scale 21 having continuous scale lines 213 and special scale lines 214, and the second scale 21 being rotatably connected to the first scale 12 via a rotating connection device; the end of the locking block 22 having a plug-in block 222, and the end of the second scale 21 having a plug-in interface 212 adapted to the plug-in block 222.

[0056] With the above solution, during use, the locking block 22 is installed by the plug-in block 222 and the plug interface 212, which is convenient to install and easy to disassemble.

[0057] The scale lines on the second scale 21 are similar to those on the first scale 12. Both sides of the second guide hole 211 have scale lines; one side has continuous scale lines, and the other side has special scale lines (such as...). , The difference is that the scale lines on the second scale 21 gradually increase in size from one end of the second scale 21 to the other end, and the starting point corresponds to the rotation focus of the second scale 21 and the first scale 12.

[0058] Optionally, by Figures 1-5 , Figure 7As shown, in this embodiment, the rotating connection device includes: a second bolt 18 passing through the second bearing 17 and screwed to the first scale 12 through the hole 123; the second bearing 17 is adapted to the second guide sliding hole 211; and the second bolt 18 is also used to restrict the vertical movement freedom of the second scale 21.

[0059] With the above scheme adopted, when in use, the second bearing 17 serves as the rotation base point between the second scale 21 and the first scale 12, so that the second scale 21 rotates around the second bearing 17 as the axis.

[0060] The threaded engagement between the second bolt 18 and the hole 123 creates a stable rotating structure between the second scale 21 and the first scale 12, restricting the vertical freedom of movement of the second scale 21. (As mentioned earlier, when drawing an ellipse, the rope loop 4 needs to be taut, so the drawer needs to apply an outward pushing force to the retractable pen assembly 3 and make the retractable pen assembly 3 make a circular motion. At this time, the second scale 21 will not be displaced due to the presence of the second guide sliding hole 211. The design of the second guide sliding hole 211 is only used to adjust the position of the retractable pen assembly 3.)

[0061] Optionally, by Figure 1 , Figure 2 , Figures 8-12 As shown, in this embodiment, the retractable pen assembly 3 includes: a housing 31 with a cavity, a length adjustment device provided inside the cavity, a second through hole 312 at the front end of the housing 31, a third through hole 314 at the lower end, a second fixing post 313 in the middle inside, a mounting cavity 311 provided in the housing 31, and a fourth through hole 315 inside the mounting cavity 311; an end cap 32 with a sliding connection device at the upper part, which is fixed to the open end of the housing 31 at the screw hole 326 by a self-tapping screw, and a third fixing post 325 with a hollow interior at the top; an automatic lead structure 35, which passes through the interior of the third fixing post 325, the middle of the rope loop 4, and the third through hole 314 in sequence, and is fixed to the end cap 32 by the threaded structure of the pen tip and the pen barrel; and a rotating cylinder 39 loosely fitted outside the third fixing post 325.

[0062] After adopting the above scheme, during use, the retractable pen assembly 3, through the coordinated work of the length adjustment device and the sliding connection device, converts the effective length of the cord loop 4 (corresponding to the elliptical parameter 2a) into the precise movement trajectory of the pen tip in the automatic lead structure 35.

[0063] In the automatic pencil structure 35, the pen cap is fixed to the top of the third fixed post 325, which restricts the longitudinal movement freedom of the rotating cylinder 39 and ensures that the rotating cylinder 39 can only rotate on the third fixed post 325. The rotating cylinder 39 is loosely fitted outside the third fixed post 325, which can prevent errors caused by the rotation of the drawing person's hand during drawing.

[0064] After the rope loop 4 is fitted into the slot 135, the length of the rope loop 4 is adjusted using the length adjustment device. At this time, the take-up pen assembly 3 is moved along the length direction of the second scale 21 and moved to the precise position according to the scale line on the second scale 21.

[0065] When the take-up pen assembly 3 moves to the set position, the rope loop 4 is also adjusted to the appropriate length. The length of the rope loop 4 is fixed by the length adjustment device. When drawing, the drawer holds the rotating cylinder 39 and pushes the take-up pen assembly 3 outward to tighten the rope loop 4. At the same time, the drawer controls the take-up pen assembly 3 to make a circular motion. The take-up pen assembly 3 drives the second scale 21 to rotate around the second bearing 17 as the axis. After one rotation, the drawing of the entire ellipse is completed.

[0066] Optionally, by Figure 1 , Figure 2 , Figures 7-12 As shown, in this embodiment, the sliding connection device includes: a locking platform 321 slidably connected to the second scale 21 through a second guide sliding hole 211; a limiting block 323 adapted to the second scale 21 to restrict the horizontal movement freedom of the second scale 21; and the locking platform 321 and the limiting block 323 cooperating to restrict the vertical movement freedom of the second scale 21.

[0067] After adopting the above scheme, when in use, the second guide sliding hole 211 of the second scale 21 passes through the locking platform 321 of the take-up pen assembly 3. The outer side of the second scale 21 is restricted in position by the limiting block 323. After the second scale 21 completely passes through the entire end cap 32, the plug 222 of the locking block 22 is inserted into the plug interface 212 of the second scale 21. The take-up pen assembly 3 can only slide horizontally along the length direction of the second scale 21 through the second guide sliding hole 211.

[0068] During drawing, the angular velocity of the retractable pen assembly 3 and the auxiliary ruler assembly 2 is kept consistent by the clamping table 321 and the limiting block 323. At the same time, the pen tip of the retractable pen assembly 3 is always perpendicular to the paper surface, minimizing the error caused by pen tip position deviation.

[0069] Optionally, by Figure 1 , Figure 2 , Figures 8-16As shown, in this embodiment, the length adjustment device includes: a bidirectional ratchet 33 loosely fitted onto the second fixed post 313 through its central fifth through hole 331 to form a rotating structure; an inner hook outer clamp spring 34 placed in the inner ring 332 of the bidirectional ratchet 33, one end of which is hooked into the second fixed post 313, and the other end extending out of the sixth through hole 334 of the bidirectional ratchet 33; a rope loop 4 with one end clamped at the outer clamp of the inner hook outer clamp spring 34 and wound around the outer ring 333 of the bidirectional ratchet 33, and the other end extending out through the second through hole 312 of the outer casing 31 and fitted into the slot 135; and an insertion block 37 slidably disposed on the outer casing 31. Inside the mounting cavity 311, there is a locking block 371, a fourth fixing post 372, and a contact block 373. The locking block 371 is engaged in the tooth gap 335 of the bidirectional ratchet 33 through the fourth through hole 315 of the outer shell 31. The reset spring 38 is located between the inner wall of the mounting cavity 311 and the insertion block 37 and is fixed on the fourth fixing post 372 of the insertion block 37. The switch 36 is rotatably disposed inside the mounting cavity 311. On the outside of the insertion block 37, the switch 36 is provided with an opening operation block 361, a closing operation block 362, and a rocker arm 363. The baffle 324 is fixed to the front end of the end cover 32 and is used to restrict the movement of the switch 36 in the horizontal direction.

[0070] After adopting the above scheme, when the user needs to adjust the effective length of the rope loop 4 (i.e., the elliptical parameter 2a) during use, first move the rocker arm 363 away from the bidirectional ratchet 33. At this time, the switch 36 is turned on, the opening operation block 361 is engaged with the contact block 373, the reset spring 38 is in a relaxed state, and the locking block 371 is disengaged from the tooth gap 335 of the bidirectional ratchet 33. At this time, the bidirectional ratchet 33 can rotate freely.

[0071] One end of the rope loop 4 is locked in the outer locking position of the inner hook and outer locking spring 34 (the inner hook and outer locking spring 34 is placed on the inner ring 332 of the bidirectional ratchet 33, the inner hook is on the second fixing post 313, the outer locking extends out from the sixth through hole 334 of the bidirectional ratchet 33, and the outer locking is on the outer ring 333 of the bidirectional ratchet 33). The rope loop 4 is wrapped around the outer ring 333 of the bidirectional ratchet 33, and the other end extends out through the second through hole 312 of the outer casing 31 and is fitted into the locking groove 135.

[0072] When it is necessary to lengthen the rope loop 4, move the rocker arm 363 away from the bidirectional ratchet 33. At this time, the switch 36 is turned on, the operating block 361 is engaged with the contact block 373, the return spring 38 is in the normal state, and the locking block 371 is disengaged from the tooth gap 335 of the bidirectional ratchet 33. At this time, the bidirectional ratchet 33 can rotate freely. Then push the outer shell 31 to move away from the main scale assembly 1, which can lengthen the rope loop 4. The rope loop 4 drives the bidirectional ratchet 33 to rotate against the elastic force of the inner hook and outer lock spring 34.

[0073] After the take-up pen assembly 3 moves to the set position, rocker 363 is pushed towards the direction close to the bidirectional ratchet 33. At this time, switch 36 is closed, closing operation block 362 fits with contact block 373, reset spring 38 is in a contracted state, and latch 371 is snapped into tooth gap 335 of the bidirectional ratchet 33 for locking. At this time, the bidirectional ratchet 33 cannot continue to rotate, thus ensuring the stability after the length of the rope loop 4 is adjusted.

[0074] Preferably, as shown by Figures 1-6 , Figure 8 , Figure 9 , Figure 12 In this embodiment, first bearing 16 is press-fitted onto first fixed column 134, and its outer diameter is equal to the outer width of card slot 135. The take-up pen assembly 3 rotates for drawing by means of the taut rope loop 4 in card slot 135, and first bearing 16 rotates together with rope loop 4. Rotating cylinder 39 is sleeved loosely outside third fixed column 325. When drawing, the rotating cylinder 39 is held by hand and rotates around third fixed column 325.

[0075] After adopting the above scheme, during use, the rotation of first bearing 16 during drawing can reduce the friction between rope loop 4 and card slot 135, making the entire drawing process smooth. When drawing, the take-up pen assembly 3 needs to rotate one week around the center point of the main scale assembly 1. The rotation of rotating cylinder 39 during drawing can prevent errors caused by the rotation of the hand of the drawing personnel during drawing, and at the same time enable the entire drawing process to be completed at one time.

[0076] Preferably, as shown by Figures 1-9 , Figure 12 In this embodiment, a first mark 112 is provided in the middle of the bottom surface of connecting plate 11 for marking the coordinate axis, and a second mark 133 is provided at the end of the top surface of adjusting ruler 13 for marking the coordinate axis; a third mark 137 is provided on the outer wall of adjusting ruler 13 for aligning with the main scale continuous graduation lines 121 and main scale special graduation lines 122 on first scale 12; a fourth mark 221 is provided on locking block 22 for aligning with the marked coordinate axis; a fifth mark 322 is provided on the upper part of end cap 32 for aligning with the auxiliary scale continuous graduation lines 213 and auxiliary scale special graduation lines 214 on second scale 21.

[0077] After adopting the above scheme, during use, first mark 112 is used to mark the coordinate axis where the minor axis of the ellipse is located (mark the y-axis when a > b; mark the x-axis when a < b), second mark 133 is used to mark the coordinate axis where the major axis of the ellipse is located (mark the x-axis when a > b; mark the y-axis when a < b), and fourth mark 221 is used to align with the marked coordinate axis to check the relative position of the auxiliary scale assembly 2 and the main scale assembly 1 (when aligning with the coordinate axis marked by first mark 112, the positions of the auxiliary scale assembly 2 and the main scale assembly 1 are orthogonal; when aligning with the coordinate axis marked by second mark 133, the positions of the auxiliary scale assembly 2 and the main scale assembly 1 are horizontal).

[0078] When adjusting the length of the main scale assembly 1 to adjust the focal length of the drawn ellipse, use the third mark 137 to align with the main scale continuous graduation line 121 or the main scale special graduation line 122 on the first scale 12 (the value of the graduation line aligned with the third mark 137 is the focal length); when adjusting the length of the rope loop 4, use the fifth mark 322 to align with the auxiliary scale continuous graduation line 213 or the auxiliary scale special graduation line 214 on the second scale 21 (when the auxiliary scale assembly 2 and the main scale assembly 1 are orthogonal, the value of the graduation line aligned with the fifth mark 322 is the minor axis; when the auxiliary scale assembly 2 and the main scale assembly 1 are horizontal, the value of the graduation line aligned with the fifth mark 322 is the major axis), making each adjustment process visible and more precise.

[0079] Components not described in detail in this article are existing technologies.

[0080] Assembly process and usage method of the present invention: Assemble the main scale assembly 1: Fix the nut 15 in the hexagonal inner groove 136 of the left and right adjustment scale 13, and install the first bearing 16 on the first fixed post 134; push the left and right adjustment scale 13 into the connecting plate 11 through the first guide sliding hole 111; screw the first bolt 14 through the first through hole 132, the first guide sliding hole 111 and the nut 15 in the hexagonal inner groove 136 in sequence; screw the second bolt 18 through the second bearing 17 into the hole 123 of the first scale 12 (the connecting plate 11 and the first scale 12 are a part fixed together, which are the lower half and the upper half of the same part, respectively).

[0081] Assemble the thread take-up pen assembly 3: Install the inner hook and outer clip spring 34 onto the inner ring 332 of the bidirectional ratchet 33, with the outer clip extending out of the outer ring 333 of the bidirectional ratchet 33 through the sixth through hole 334; clip one end of the rope loop 4 onto the outer clip of the inner hook and outer clip spring 34, and then wrap the rope loop around the outer ring 333 of the bidirectional ratchet 33; fix the bidirectional ratchet 33 to the second fixing post 313 of the outer casing 31 through the fifth through hole 331 using the inner hook of the inner hook and outer clip spring 34, forming a rotating structure; extend the other end of the rope loop 4 through the second through hole 312 of the outer casing 31; pass the barrel of the automatic lead structure 35 through the inside of the third fixing post 325 of the end cap 32 (the third fixing post 325 is a hollow structure), and screw it from the other side. Tighten the pen tip and fix the mechanical pencil structure 35 to the end cap 32; fix the return spring 38 to the fourth fixing post 372 of the insertion block 37, slide the insertion block 37 into the fourth through hole 315 of the mounting cavity 311 of the outer shell 31 through the locking block 371, and insert the rocker arm 363 of the switch 36 outward into the mounting cavity 311; fix the end cap 32 to one open end of the outer shell 31 with self-tapping screws (Note: when fixing, make sure the pen tip of the mechanical pencil structure 35 passes through the rope loop 4 and the third through hole 314 in sequence; make the baffle 324 located in front of the mounting cavity 311, so that the mounting cavity 311 becomes a closed structure); pass the rotating cylinder 39 through the outside of the third fixing post 325, and insert the pen cap of the mechanical pencil structure 35 into the pen barrel.

[0082] Assemble the whole: The second scale 21 and the main scale assembly 1 are rotatably connected by passing through the second bearing 17 through the second guide slide hole 211; the second scale 21 and the line take-up pen assembly 3 are slidably connected by passing through the locking plate 321 through the second guide slide hole 211 and the limiting block 323 through the outer side of the second scale 21; the locking block 22 is fixed to one end of the opening of the second scale 21 by inserting the plug 222 into the plug interface 212, so that the second guide slide hole 211 is closed; the rope loop 4 extending from the second through hole 312 is fitted into the slot 135 of the main scale assembly 1.

[0083] At this point, the assembly of the invention is complete. It will not need to be reassembled for each subsequent use; only the corresponding adjustments need to be made each time it is used.

[0084] During adjustment, first adjust the overall length of the main scale assembly 1 according to the focal length of the ellipse to be drawn. The user first loosens the first bolt 14 so that it is out of contact with the end face of the adjusting scale 13. The adjusting scale 13 can slide easily along the axis of the main scale. The scale lines on the first scale 12 ensure that the adjustment distance of the left and right adjusting scales 13 is consistent.

[0085] After adjustment, tighten the first bolt 14. The axial tension of the threaded pair forces the inner cavity 131 side wall of the adjusting ruler 13 to press against the guide surface of the connecting plate 11. At this time, a uniformly distributed frictional force is generated on the contact surface between the adjusting ruler 13 and the connecting plate 11, ensuring the stability after locking.

[0086] After the length of the main scale assembly 1 is adjusted, pull the second scale 21 until the end of the second guide slide hole 211 coincides with the second bearing 17, and adjust the position of the auxiliary scale assembly 2 and the main scale assembly 1 so that the auxiliary scale assembly 2 and the main scale assembly 1 are in an orthogonal position or a horizontal position (determined by the parameters of the drawn ellipse; if the parameter is the major axis value, it is a horizontal position; if the parameter is the minor axis value, it is an orthogonal position).

[0087] Next, adjust the effective length of the rope loop 4 (i.e., elliptical parameter 2a). First, move the rocker arm 363 away from the bidirectional ratchet 33. The locking block 371 disengages from the tooth gap 335 of the bidirectional ratchet 33, allowing the bidirectional ratchet 33 to rotate freely. By moving the position of the take-up pen assembly 3 on the second scale 21, the length of the rope loop 4 can be changed (when the fifth mark 322 is aligned with the scale line of the second scale 21, if the main scale assembly 1 and the auxiliary scale assembly 2 are horizontal, the value is the major axis; if the main scale assembly 1 and the auxiliary scale assembly 2 are orthogonal, the value is the minor axis). After the take-up pen assembly 3 is moved to the set position, move the rocker arm 363 towards the bidirectional ratchet 33. The locking block 371 engages with the tooth gap 335 of the bidirectional ratchet 33 and locks it in place. At this point, the bidirectional ratchet 33 cannot continue to rotate, thus ensuring the stability of the rope loop 4 after length adjustment.

[0088] After the adjustment is completed, the drafter holds the rotating cylinder 39 and pushes the take-up pen assembly 3 outward to tighten the rope loop 4. At the same time, the take-up pen assembly 3 is controlled to make a circular motion. The take-up pen assembly 3 drives the second scale 21 to rotate around the second bearing 17 as the axis. After one rotation, the drawing of the entire ellipse is completed.

[0089] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ellipse ruler for drawing an ellipse with a semi-automatic take-up device, characterized in that The utility model relates to an ellipse ruler for drawing ellipse with semi-automatic winding device, which comprises a main ruler assembly (1) for providing a focal length stepless adjustment frame, a subsidiary ruler assembly (2) movably connected with the main ruler assembly (1) through a rotating connection device and capable of rotating around a center point of the main ruler assembly (1), and a winding pen assembly (3) movably connected with the subsidiary ruler assembly (2) through a sliding connection device and connected with the main ruler assembly (1) through a rope loop (4), wherein the winding pen assembly (3) is provided with a length adjustment device for steplessly adjusting the length of the rope loop (4) to draw ellipses with different parameters.

2. The utility model as claimed in claim 1 is characterized in that the main ruler assembly (1) comprises a connecting plate (11) provided with a first guide sliding hole (111), a first scale (12) extending along the length direction, the first scale (12) being provided with a main ruler continuous scale line (121) and a main ruler special scale line (122) and having a hole (123) at the top center, the first scale (12) being fixed to the connecting plate (11), and two left and right symmetrical adjustment rulers (13) movably connected to the connecting plate (11) and fixed to the first scale (12) at any position through a scale adjustment device, the inner wall of the adjustment ruler (13) being provided with a first fixing column (134) for fixing a first bearing (16), and the outer wall of the adjustment ruler (13) being provided with a clamping groove (135) for embedding the rope loop (4).

3. The utility model as claimed in claim 1 is characterized in that the scale adjustment device comprises a first bolt (14), the adjustment ruler (13) being provided with an inner cavity (131) for embedding the connecting plate (11) and the first scale (12), the lower part of the inner cavity (131) being provided with a hexagonal inner groove (136) for fixing a nut, the first bolt (14) penetrating through a first through hole (132) provided in the adjustment ruler (13) and the first guide sliding hole (111), and a nut (15) fixed to the hexagonal inner groove (136) and threadedly matched with the protruding end of the first bolt (14).

4. The utility model as claimed in claim 1 is characterized in that the subsidiary ruler assembly (2) comprises a second scale (21) provided with a second guide sliding hole (211), the second scale (21) being provided with a subsidiary ruler continuous scale line (213) and a subsidiary ruler special scale line (214) and being rotatably connected with the first scale (12) through the rotating connection device, and a locking block (22) provided with an insertion block (222) at the end, and the end of the second scale (21) is provided with an insertion port (212) matched with the insertion block (222). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5. An elliptical ruler for drawing ellipses using a semi-automatic winding device as described in claim 1, characterized in that: The rotating connection device includes: a second bearing (17), a second bolt (18), the second bolt (18) passing through the second bearing (17) and screwed to the first scale (12) through the hole (123), the second bearing (17) being adapted to the second guide sliding hole (211), and the second bolt (18) also being used to restrict the vertical movement freedom of the second scale (21).

6. An elliptical ruler for drawing ellipses using a semi-automatic winding device as described in claim 1, characterized in that: The lead-in pen assembly (3) includes: The outer shell (31) has a cavity, the length adjustment device is located in the cavity, the front end of the outer shell (31) has a second through hole (312), the lower end has a third through hole (314), the middle of the inner side of the outer shell (31) has a second fixing post (313), the outer shell (31) has an installation cavity (311), and the installation cavity (311) has a fourth through hole (315). End cap (32), the end cap (32) is fixed to the opening end of the outer shell (31) by self-tapping screws through screw holes (326), and the upper part of the end cap (32) is provided with the sliding connection device; A third fixing post (325) is fixed to the top of the end cap (32), and the interior of the third fixing post (325) is hollow; Automatic lead structure (35) passes through the interior of the third fixing post (325), the middle of the rope loop (4), and the third through hole (314) in sequence, and is fixed to the end cap (32) by the threaded structure of the pen tip and the pen barrel. A rotating cylinder (39) is loosely fitted outside the third fixed column (325).

7. An elliptical ruler for drawing ellipses using a semi-automatic winding device as described in claim 1, characterized in that: The sliding connection device includes: The card plate (321) is slidably connected to the second scale (21) through the second guide slide hole (211); The limiting block (323) is adapted to the second scale (21) to restrict the horizontal movement freedom of the second scale (21). The locking platform (321) cooperates with the limiting block (323) to restrict the vertical movement freedom of the second scale (21).

8. An elliptical ruler for drawing ellipses using a semi-automatic winding device as described in claim 1, characterized in that: The length adjustment device includes: A bidirectional ratchet (33) is loosely fitted onto the second fixed post (313) through the fifth through hole (331) in the middle to form a rotating structure; The inner hook and outer clamp spring (34) is placed on the inner ring (332) of the bidirectional ratchet (33), with one end hooked inward to the second fixing post (313) and the other end extending out into the sixth through hole (334) of the bidirectional ratchet (33); one end of the rope loop (4) is clamped at the outer clamp of the inner hook and outer clamp spring (34) and wound around the outer ring (333) of the bidirectional ratchet (33), and the other end extends out through the second through hole (312) of the outer shell (31) and is fitted into the slot (135); Insertion block (37), the insertion block (37) is slidably disposed in the mounting cavity (311), the insertion block (37) is provided with a locking block (371), a fourth fixing post (372) and a contact block (373), the locking block (371) is inserted into the tooth gap (335) of the bidirectional ratchet (33) through the fourth through hole (315); A reset spring (38) is located between the inner wall of the mounting cavity (311) and the insertion block (37), and is fixed on the fourth fixing post (372) of the insertion block (37). The switch (36) is rotatably disposed in the mounting cavity (311) and outside the insertion block (37). The switch (36) is provided with an opening operation block (361), an closing operation block (362), and a rocker (363). A baffle (324) is fixed to the front end of the end cap (32) to restrict the movement of the switch (36) in the horizontal direction.

9. An elliptical ruler for drawing ellipses using a semi-automatic winding device as described in claims 1-8, characterized in that: The first bearing (16) is interference-fitted onto the first fixed post (134), and the outer diameter of the first bearing (16) is equal to the width of the outer end of the slot (135); The drawing pen assembly (3) draws by rotating the rope loop (4) in the slot (135) while the first bearing (16) rotates together with the rope loop (4). The rotating cylinder (39) is loosely fitted outside the third fixed column (325). When drawing, hold the rotating cylinder (39) in your hand and rotate the rotating cylinder (39) around the third fixed column (325).

10. An elliptical ruler for drawing ellipses using a semi-automatic winding device as described in claims 1-8, characterized in that: The bottom surface of the connecting plate (11) is provided with a first mark (112) for marking the coordinate axis, and the top end of the adjusting ruler (13) is provided with a second mark (133) for marking the coordinate axis; the outer wall of the adjusting ruler (13) is provided with a third mark (137) for aligning the main scale continuous scale line (121) and the main scale special scale line (122) on the first scale (12). The locking block (22) is provided with a fourth mark (221) for aligning the marked coordinate axes; The upper part of the end cap (32) is provided with a fifth mark (322) for aligning the auxiliary ruler continuous scale line (213) and the auxiliary ruler special scale line (214) on the second scale (21).

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