A compass capable of drawing parallel lines

Abstract

The present invention discloses a compass capable of drawing parallel lines, comprising a top fixing unit, a circle drawing unit and a line drawing unit, wherein the line unit and the circle drawing unit are both connected to the top fixing unit, the circle drawing unit can draw a circle, and the line drawing unit and the circle drawing unit can cooperate to draw parallel lines, the top fixing unit is provided with a hinged portion, the circle drawing unit comprises a rotating shaft leg and a circle drawing leg hinged to the hinged portion, the line drawing unit comprises a line drawing leg hinged to the hinged portion, a bracket connected to the bottom of the line drawing leg, a roller connected to the bottom end of the bracket, a second pen matched with the bracket, and a third tightening member connecting the bracket and the circle drawing leg. The device described in the present invention combines a compass with a parallel line drawing tool, and one device has two uses, which increases the use of the tool and makes it more convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of teaching tools or stationery, in particular to a compass capable of drawing parallel lines. Background Art

[0002] Circles and parallel lines are graphics that students and teachers often encounter in their daily learning and teaching. Existing compasses can only be used as tools for drawing circles and arcs, and have a single purpose. At the same time, teachers and students generally use two rulers to draw parallel lines, which is a cumbersome process and low accuracy, causing great inconvenience to daily learning and teaching. In addition, if a special parallel line drawing tool is used for drawing, the existing parallel line drawing tool occupies a relatively large volume, which is not suitable for students to draw, and the operation process is complicated and difficult to produce. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above problems and / or the problems existing in the existing compasses, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is how to enable the compass to have the function of drawing parallel lines.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a top fixing unit, which is provided with a hinged portion; a circle drawing unit, which is connected to the top fixing unit and includes a rotating shaft leg and a circle drawing leg hinged to the hinged portion, a needle tip is provided at the bottom end of the rotating shaft leg, and a first pen is detachably connected to the bottom of the circle drawing leg; and a line drawing unit, which is connected to the top fixing unit and includes a line drawing leg hinged to the hinged portion, a bracket connected to the bottom of the line drawing leg, a roller connected to the bottom end of the bracket, and a second pen cooperating with the bracket.

[0007] As a preferred solution of the compass capable of drawing parallel lines described in the present invention, the rotating shaft leg comprises an upper rotating shaft section hinged to the hinge portion, and a lower rotating shaft section rotatably connected to the bottom of the upper rotating shaft section.

[0008] As a preferred solution of the compass capable of drawing parallel lines described in the present invention, a first groove, a clamping piece and a second groove are provided on the side surface of the upper section of the rotating shaft, the clamping piece is provided on the upper part of the two side surfaces of the first groove, the lower section of the rotating shaft cooperates with the first groove, and the second groove is provided perpendicularly to the first groove.

[0009] As a preferred solution of the compass capable of drawing parallel lines described in the present invention, a first fixing member and a first tightening member are provided at the bottom end of the circle drawing leg, the first tightening member cooperates with the first fixing member, and the first pen cooperates with the first fixing member.

[0010] As a preferred solution of the compass capable of drawing parallel lines described in the present invention, a first hole is provided at the bottom end of the line drawing leg, the bracket is a triangular bracket, including a first column fixedly connected to the top surface, second holes vertically provided at three corners and a third hole located between the three second holes, a fourth hole provided horizontally, and a second tightening member cooperating with the fourth hole, and the fourth hole is connected to the third hole.

[0011] As a preferred solution of the compass capable of drawing parallel lines described in the present invention, the first column is provided with a fifth hole cooperating with the first hole, and a third groove wrapping the fifth hole, the line drawing unit also includes a third tightening member, the third tightening member includes a nut cooperating with the third groove, and a bolt passing through the first hole and the fifth hole.

[0012] As a preferred solution of the compass capable of drawing parallel lines of the present invention, the bolt is symmetrically provided with two ears.

[0013] As a preferred solution of the compass capable of drawing parallel lines of the present invention, the roller comprises a support member matched with the second hole, and a wheel rotatably matched with the bottom end of the support member, and the support member is detachably matched with the bracket.

[0014] As a preferred solution of the compass capable of drawing parallel lines of the present invention, the length of the rotating shaft leg is smaller than the length of the circle drawing leg, and the length of the circle drawing leg is smaller than the length of the line drawing unit.

[0015] As a preferred solution of the compass capable of drawing parallel lines of the present invention, the first screwing member and the second screwing member are both provided with fourth grooves, and the fourth grooves are arranged in an array along the circumference of the first screwing member or the second screwing member.

[0016] The beneficial effects of the present invention are that a compass is combined with a parallel line drawing tool, so that one tool has two uses, the uses of the tool are increased, and the use is made more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 This is the structural diagram of the compass that can draw parallel lines in Example 1.

[0019] Figure 2 This is a cross-sectional view of the pivot leg of the compass used to draw parallel lines in Example 2.

[0020] Figure 3 This is the front view of the compass used to draw parallel lines in Example 2.

[0021] Figure 4 This is a front view of the drawing leg of the compass used to draw parallel lines in Example 2.

[0022] Figure 5 This is an exploded view of part of the line drawing unit of the compass that can draw parallel lines in Example 2.

[0023] Figure 6 Figure 3 shows the first and third screwing parts of the compass used to draw parallel lines. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1

[0028] Reference Figure 1, which is the first embodiment of the present invention, and this embodiment provides a compass for drawing parallel lines. The compass for drawing parallel lines includes a top fixing unit 100, a circle drawing unit 200 and a line drawing unit 300. The line drawing unit 300 and the circle drawing unit 200 are both connected to the top fixing unit 100, the circle drawing unit 200 can draw a circle, and the line drawing unit 300 and the circle drawing unit 200 can draw parallel lines together.

[0029] Specifically, the top fixing unit 100 is provided with a hinged portion 101. The top fixing unit 100 has two functions: one is to connect the line drawing unit 300 and the circle drawing unit 200; the other is that when drawing a circle, a person needs to pinch the cylinder on the top fixing unit 100 to rotate it.

[0030] The circle drawing unit 200 includes a rotating shaft leg 201 and a circle drawing leg 202 hinged to the hinge part 101. A needle tip 203 is provided at the bottom end of the rotating shaft leg 201. A first pen 204 is detachably connected to the bottom of the circle drawing leg 202. The rotating shaft leg 201 is used for fixing, and the circle drawing leg 202 is used for drawing a circle.

[0031] The line drawing unit 300 includes a line drawing leg 301 hinged to the hinge part 101, a bracket 302 connected to the bottom of the line drawing leg 301, a roller 303 connected to the bottom end of the bracket 302, and a second pen 304 matched with the bracket 302. The line drawing leg 301 is rotatably connected to the bracket 302, the second pen 304 and the roller 303 are both matched with the bracket 302, the number of rollers 303 should be greater than 3, and they cannot be on the same straight line.

[0032] In summary, the top fixing unit 100 is hingedly connected to the rotating shaft leg 201, the circle drawing leg 202 and the line drawing leg 301, the bottom end of the rotating shaft leg 201 has a needle tip 203, the circle drawing leg 202 is connected to the first pen 204, the line drawing leg 301 is rotatably connected to the bracket 302, and the bracket 302 is connected to the roller 303 and the second pen 304.

[0033] When in use, the second pen 304 is installed on the circle drawing leg 202. When a circle needs to be drawn, the line drawing unit 300 is rotated upward, and then a circle is drawn according to the normal steps of drawing a circle with a compass. When parallel lines need to be drawn, the shaft leg 201 is rotated upward, the distance between the second pen 304 and the first pen 204 is adjusted, and then the compass is driven to move. At this time, under the action of the roller 303, the compass will tend to move in a straight line, so parallel lines can be drawn by this method.

[0034] Example 2

[0035] Reference Figures 2 to 5, which is the second embodiment of the present invention, and is different from the first embodiment in that: the shaft leg 201 includes a shaft upper section 201a and a shaft lower section 201b, the circle drawing leg 202 includes a first fixing member 202a and a first screwing member 202b, the line drawing leg 301 is provided with a first hole 301a, the bracket 302 includes a first column 302a, a second hole 302b, a third hole 302c, a fourth hole 302d and a second screwing member 302e, and the line drawing unit 300 also includes a third screwing member 305. In the previous embodiment, the compass capable of drawing parallel lines includes a top fixing unit 100, a circle drawing unit 200 and a line drawing unit 300, the line drawing unit 300 and the circle drawing unit 200 are both connected to the top fixing unit 100, the circle drawing unit 200 can draw a circle, and the line drawing unit 300 and the circle drawing unit 200 can cooperate to draw parallel lines.

[0036] Specifically, the top fixing unit 100 is provided with a hinged portion 101. The top fixing unit 100 has two functions: one is to connect the line drawing unit 300 and the circle drawing unit 200; the other is that when drawing a circle, a person needs to pinch the cylinder on the top fixing unit 100 to rotate it.

[0037] The circle drawing unit 200 includes a rotating shaft leg 201 and a circle drawing leg 202 which are hinged to the hinge part 101, a needle tip 203 is arranged at the bottom end of the rotating shaft leg 201, and a first pen 204 is detachably connected to the bottom of the circle drawing leg 202, the rotating shaft leg 201 is used for fixing, and the circle drawing leg 202 is used for drawing a circle, the rotating shaft leg 201 includes an upper rotating shaft section 201a which is hinged to the hinge part 101, and a lower rotating shaft section 201b which is rotatably connected to the bottom of the upper rotating shaft section 201a, a first groove 201a-1, a clamping piece 201a-2 and a second groove 201a-3 are arranged on the side of the upper rotating shaft section 201a, and the clamping piece 201a-2 is arranged on the first rotating shaft section 201a. On the upper part of the two sides of a groove 201a-1, the lower section 201b of the shaft cooperates with the first groove 201a-1, and a part of the lower section 201b of the shaft is arranged in the first groove 201a-1. When the lower section 201b of the shaft is in the same straight line with the upper section 201a of the shaft, it will be clamped by the clamping part 201a-2 and will not rotate easily. It needs a little force to rotate again. The second groove 201a-3 is used to take the lower section 201b of the shaft out of the first groove 201a-1 through the second groove 201a-3 when the lower section 201b of the shaft is completely rotated into the first groove 201a-1. A first fixing member 202a and a first tightening member 202b are provided at the bottom end of the circle drawing leg 202. The first tightening member 202b cooperates with the first fixing member 202a, and the first pen 204 cooperates with the first fixing member 202a. When the first pen 204 is placed in the first fixing member 202a, the first tightening member 202b can clamp the first pen 204.

[0038] The line drawing unit 300 includes a line drawing leg 301 hinged to the hinge part 101, a bracket 302 connected to the bottom of the line drawing leg 301, a roller 303 connected to the bottom end of the bracket 302, and a second pen 304 matched with the bracket 302. A first hole 301a is provided at the bottom end of the line drawing leg 301. The bracket 302 is a triangular bracket, including a first column 302a fixedly connected to the top surface, second holes 302b vertically arranged at three corners and a third hole 302c located between the three second holes 302b, a fourth hole 302d arranged horizontally, and a second tightening member 302e matched with the fourth hole 302d. The first column 302a is vertically arranged, and its shape is not specifically required. The fourth hole 302d is connected to the third hole 302c. The first column 302a is provided with a fifth hole 302a-1 matched with the first hole 301a, and a third groove 302a-2 wrapping the fifth hole 302a-1. The line drawing unit 300 also includes a third screw-on member 305. The third screw-on member 305 includes a nut 305a matched with the third groove 302a-2, and a bolt 305b passing through the first hole 301a and the fifth hole 302a-1. The roller 303 includes a support member 303a matched with the second hole 302b, and a wheel 303b rotatably matched with the bottom end of the support member 303a. The support member 303a is detachably matched with the bracket 302. The second pen 304 is placed in the third hole 302c. The roller 303 includes a support member 303a matched with the second hole 302b. And a wheel 303b that rotates with the bottom of the support member 303a, the support member 303a and the bracket 302 can be detachably matched, the support member 303a is specifically a support column, and its top end is matched with the second hole 302b. There are two specific matching methods: one, the top of the support member 303a is provided with a thread, and the second hole 302b is provided with an internal thread that matches it, and then the support member 303a can be rotated into the second hole 302b for fixing; two, the top of the support member 303a is provided with a section of cylinder, the top of the cylinder is provided with a thread, the cylinder passes through the second hole 302b and is then tightened by a nut, and the length or width of the cross section of the support member 303a body is greater than the diameter of the second hole 302b, so that the bracket 302 can be placed on the support member 303a body. The second matching method is preferred in the present invention.

[0039] Preferably, the length of the rotating shaft leg 201 is smaller than the length of the circle drawing leg 202, and the length of the circle drawing leg 202 is smaller than the length of the line drawing unit 300. Meanwhile, the first pen 204 and the second pen 304 can be pencils, ballpoint pens, fountain pens, automatic pencils, etc.

[0040] It should be noted that the first tightening member 202b and the second tightening member 302e are both provided with external threads, and the first fixing member 202a and the fourth hole 302d are both provided with internal threads.

[0041] In summary, the top fixing unit 100 is hinged to the shaft leg 201, the circle drawing leg 202 and the line drawing leg 301. The shaft upper section 201a of the shaft leg 201 is rotatably connected with the shaft lower section 201b. The shaft lower section 201b can be rotated into the first groove 201a-1 of the shaft upper section 201a and is limited by the clamping piece 201a-2. The bottom end of the shaft lower section 201b has a needle tip 203. The circle drawing leg 202 is connected by the clamping piece 201a-2. The first fixing member is connected to the first pen 204, and the first pen 204 is clamped by the first tightening member 202b. The drawing leg 301 is connected to the bracket 302 through the third tightening member 305. The bracket 302 can rotate relative to the drawing leg 301. The bracket 302 is connected to the roller 303 through the supporting member 303a. The second pen 304 is placed in the third hole 302c and is tightened by the second tightening member 302e.

[0042] Normally, the lower section 201b of the rotating shaft and the needle tip 203 are completely placed in the first groove 201a-1 to prevent the needle tip 203 from pricking people. When it is needed, the lower section 201b of the rotating shaft is taken out of the first groove 201a-1 through the second groove 201a-3, then rotated 180°, clamped by the clamping piece 201a-2, and then the first pen 204 is placed in the first fixing piece 202a, tightened with the first tightening piece 202b, and then normal circle drawing is carried out. When it is necessary to draw parallel lines, the lower section 201b of the rotating shaft is rotated 180° so that it is completely placed in the first groove 201a-1. This step is to prevent the needle tip 203 from pricking people when drawing parallel lines. Then the bracket 302 is fixed to the line drawing leg 301 through the third tightening piece 305, and the roller 303 is fixed to the bracket 302 through the support piece 303a. The second pen 304 is placed in the third hole 302c and tightened with the second tightening piece 302e. Then, the distance between the first pen 204 and the second pen 304 is adjusted. By rotating the bracket 302, the three wheels 303b are all in contact with the paper surface. After adjustment, the third tightening piece 305 is tightened. At this time, parallel lines can be drawn.

[0043] Example 3

[0044] Reference Figure 6 , which is the third embodiment of the present invention, and is different from the previous two embodiments in that: the bolt 305b is symmetrically provided with two ears 305b-1, and the first tightening member 202b and the second tightening member 302e are both provided with a fourth groove 202b-1. In the previous embodiment, the compass capable of drawing parallel lines comprises a top fixing unit 100, a circle drawing unit 200 and a line drawing unit 300, the line drawing unit 300 and the circle drawing unit 200 are both connected to the top fixing unit 100, the circle drawing unit 200 can draw a circle, and the line drawing unit 300 and the circle drawing unit 200 can cooperate to draw parallel lines.

[0045] Specifically, the top fixing unit 100 is provided with a hinged portion 101. The top fixing unit 100 has two functions: one is to connect the line drawing unit 300 and the circle drawing unit 200; the other is that when drawing a circle, a person needs to pinch the cylinder on the top fixing unit 100 to rotate it.

[0046] The circle drawing unit 200 includes a rotating shaft leg 201 and a circle drawing leg 202 which are hinged to the hinge part 101, a needle tip 203 is arranged at the bottom end of the rotating shaft leg 201, and a first pen 204 is detachably connected to the bottom of the circle drawing leg 202, the rotating shaft leg 201 is used for fixing, and the circle drawing leg 202 is used for drawing a circle, the rotating shaft leg 201 includes an upper rotating shaft section 201a which is hinged to the hinge part 101, and a lower rotating shaft section 201b which is rotatably connected to the bottom of the upper rotating shaft section 201a, a first groove 201a-1, a clamping piece 201a-2 and a second groove 201a-3 are arranged on the side of the upper rotating shaft section 201a, and the clamping piece 201a-2 is arranged on the first rotating shaft section 201a. On the upper part of the two sides of a groove 201a-1, the lower section 201b of the shaft cooperates with the first groove 201a-1, and a part of the lower section 201b of the shaft is arranged in the first groove 201a-1. When the lower section 201b of the shaft is in the same straight line with the upper section 201a of the shaft, it will be clamped by the clamping part 201a-2 and will not rotate easily. It needs a little force to rotate again. The second groove 201a-3 is used to take the lower section 201b of the shaft out of the first groove 201a-1 through the second groove 201a-3 when the lower section 201b of the shaft is completely rotated into the first groove 201a-1. A first fixing member 202a and a first tightening member 202b are provided at the bottom end of the circle drawing leg 202. The first tightening member 202b cooperates with the first fixing member 202a, and the first pen 204 cooperates with the first fixing member 202a. When the first pen 204 is placed in the first fixing member 202a, the first tightening member 202b can clamp the first pen 204.

[0047] The line drawing unit 300 includes a line drawing leg 301 hinged to the hinge part 101, a bracket 302 connected to the bottom of the line drawing leg 301, a roller 303 connected to the bottom end of the bracket 302, and a second pen 304 matched with the bracket 302. A first hole 301a is provided at the bottom end of the line drawing leg 301. The bracket 302 is a triangular bracket, including a first column 302a fixedly connected to the top surface, second holes 302b vertically arranged at three corners and a third hole 302c located between the three second holes 302b, a fourth hole 302d arranged horizontally, and a second tightening member 302e matched with the fourth hole 302d. The first column 302a is vertically arranged, and its shape is not specifically required. The fourth hole 302d is connected to the third hole 302c. The first column 302a is provided with a fifth hole 302a-1 matched with the first hole 301a, and a third groove 302a-2 wrapping the fifth hole 302a-1. The line drawing unit 300 also includes a third screw-on member 305. The third screw-on member 305 includes a nut 305a matched with the third groove 302a-2, and a bolt 305b passing through the first hole 301a and the fifth hole 302a-1. The roller 303 includes a support member 303a matched with the second hole 302b, and a wheel 303b rotatably matched with the bottom end of the support member 303a. The support member 303a is detachably matched with the bracket 302. The second pen 304 is placed in the third hole 302c. The roller 303 includes a support member 303a matched with the second hole 302b. And a wheel 303b that rotates with the bottom of the support member 303a, the support member 303a and the bracket 302 can be detachably matched, the support member 303a is specifically a support column, and its top end is matched with the second hole 302b. There are two specific matching methods: one, the top of the support member 303a is provided with a thread, and the second hole 302b is provided with an internal thread that matches it, and then the support member 303a can be rotated into the second hole 302b for fixing; two, the top of the support member 303a is provided with a section of cylinder, the top of the cylinder is provided with a thread, the cylinder passes through the second hole 302b and is then tightened by a nut, and the length or width of the cross section of the support member 303a body is greater than the diameter of the second hole 302b, so that the bracket 302 can be placed on the support member 303a body. The second matching method is preferred in the present invention.

[0048] Furthermore, the bolt 305b is symmetrically provided with two ears 305b-1, and the first tightening member 202b and the second tightening member 302e are both provided with a fourth groove 202b-1. The fourth groove 202b-1 is arranged in an array along the circumference of the first tightening member 202b or the second tightening member 302e, so as to make the bolt 305b, the first tightening member 202b and the second tightening member 302e easier to rotate during assembly.

[0049] Preferably, the length of the rotating shaft leg 201 is smaller than the length of the circle drawing leg 202, and the length of the circle drawing leg 202 is smaller than the length of the line drawing unit 300. Meanwhile, the first pen 204 and the second pen 304 can be pencils, ballpoint pens, fountain pens, automatic pencils, etc.

[0050] In summary, the top fixing unit 100 is hinged to the shaft leg 201, the circle drawing leg 202 and the line drawing leg 301. The shaft upper section 201a of the shaft leg 201 is rotatably connected with the shaft lower section 201b. The shaft lower section 201b can be rotated into the first groove 201a-1 of the shaft upper section 201a and is limited by the clamping piece 201a-2. The bottom end of the shaft lower section 201b has a needle tip 203. The circle drawing leg 202 is connected by the clamping piece 201a-2. The first fixing member is connected to the first pen 204, and the first pen 204 is clamped by the first tightening member 202b. The drawing leg 301 is connected to the bracket 302 through the third tightening member 305. The bracket 302 can rotate relative to the drawing leg 301. The bracket 302 is connected to the roller 303 through the supporting member 303a. The second pen 304 is placed in the third hole 302c and is tightened by the second tightening member 302e.

[0051] Normally, the lower section 201b of the rotating shaft and the needle tip 203 are completely placed in the first groove 201a-1 to prevent the needle tip 203 from pricking people. When it is needed, the lower section 201b of the rotating shaft is taken out of the first groove 201a-1 through the second groove 201a-3, then rotated 180°, clamped by the clamping piece 201a-2, and then the first pen 204 is placed in the first fixing piece 202a, tightened with the first tightening piece 202b, and then normal circle drawing is carried out. When it is necessary to draw parallel lines, the lower section 201b of the rotating shaft is rotated 180° so that it is completely placed in the first groove 201a-1. This step is to prevent the needle tip 203 from pricking people when drawing parallel lines. Then the bracket 302 is fixed to the line drawing leg 301 through the third tightening piece 305, and the roller 303 is fixed to the bracket 302 through the support piece 303a. The second pen 304 is placed in the third hole 302c and tightened with the second tightening piece 302e. Then, the distance between the first pen 204 and the second pen 304 is adjusted. By rotating the bracket 302, the three wheels 303b are all in contact with the paper surface. After adjustment, the third tightening piece 305 is tightened. At this time, parallel lines can be drawn.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A compass capable of drawing parallel lines, characterized in that: include, A top fixing unit (100), wherein the top fixing unit (100) is provided with a hinged portion (101); The circle drawing unit (200) is connected to the top fixing unit (100), and comprises a rotating shaft leg (201) and a circle drawing leg (202) hinged to the hinge portion (101), wherein a needle tip (203) is provided at the bottom end of the rotating shaft leg (201), and a first pen (204) is detachably connected to the bottom of the circle drawing leg (202); and A line drawing unit (300) connected to the top fixing unit (100), comprising a line drawing leg (301) hinged to the hinge portion (101), a bracket (302) connected to the bottom of the line drawing leg (301), a roller (303) connected to the bottom end of the bracket (302), and a second pen (304) matched with the bracket (302); The rotating shaft leg (201) comprises an upper rotating shaft section (201a) hinged to the hinge portion (101), and a lower rotating shaft section (201b) rotatably connected to the bottom of the upper rotating shaft section (201a); The side surface of the upper section (201a) of the rotating shaft is provided with a first groove (201a-1), a clamping piece (201a-2) and a second groove (201a-3); the clamping piece (201a-2) is arranged at the upper part of the two side surfaces of the first groove (201a-1); the lower section (201b) of the rotating shaft cooperates with the first groove (201a-1); and the second groove (201a-3) is arranged perpendicular to the first groove (201a-1); A first fixing member (202a) and a first tightening member (202b) are provided at the bottom end of the circle drawing leg (202), the first tightening member (202b) cooperates with the first fixing member (202a), and the first pen (204) cooperates with the first fixing member (202a); The bottom end of the line drawing leg (301) is provided with a first hole (301a); the bracket (302) is a triangular bracket, comprising a first column (302a) fixedly connected to the top surface, second holes (302b) vertically arranged at three corners, a third hole (302c) located between the three second holes (302b), a fourth hole (302d) arranged horizontally, and a second tightening member (302e) matched with the fourth hole (302d); the fourth hole (302d) is connected to the third hole (302c); The first column (302a) is provided with a fifth hole (302a-1) matched with the first hole (301a), and a third groove (302a-2) enclosing the fifth hole (302a-1). The line drawing unit (300) further comprises a third screwing member (305), and the third screwing member (305) comprises a nut (305a) matched with the third groove (302a-2), and a bolt (305b) passing through the first hole (301a) and the fifth hole (302a-1); The roller (303) comprises a support member (303a) matched with the second hole (302b), and a wheel (303b) rotatably matched with the bottom end of the support member (303a); the support member (303a) is detachably matched with the bracket (302); The length of the rotating shaft support leg (201) is smaller than the length of the circle drawing support leg (202), and the length of the circle drawing support leg (202) is smaller than the length of the line drawing unit (300).

2. The compass capable of drawing parallel lines as claimed in claim 1, characterized in that: The first screw-on component (202b) and the second screw-on component (302e) are both provided with fourth grooves (202b-1), and the fourth grooves (202b-1) are arranged in an array along the circumference of the first screw-on component (202b) or the second screw-on component (302e).

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