CN1209394A

CN1209394A - Ellipse drawing instrument

Info

Publication number: CN1209394A
Application number: CN 97117232
Authority: CN
Inventors: 迟宗杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-08-26
Filing date: 1997-08-26
Publication date: 1999-03-03

Abstract

The present invention relates to an ellipse drawing apparatus. According to the principle of that the form of cut-intersection when the cut-plane is biased from the axis of cylinder body is an elliptical one, a cylinder body whose axis can be randomly inclined to paper surface is simulated and produced, and the paper surface is used as cut-plane, and at the same time of that the ruling pen is moved about the axis at a certain distance from the axis, the ruling pen is slided relatively to the axis and always contacted with the paper surface to simulate the process of cutting cylinder with plane and make the cut-intersection represent onto the paper surface to form an ellipse.

Description

Ellipse drawing instrument

The present invention relates to a kind of special oval instrument of drawing.

In drawing course, ellipse is a kind of curve of frequent utilization, and the manual drawing ellipse mostly is to utilize compasses, finishes with the approximate construction method." four heart methods " for example in mechanical drawing, mentioned: as known long axis of ellipse AB, minor axis CD, its mapping step is as follows, connect AC, with O is the center of circle, OA is that radius is drawn the extended line of arc friendship CD in the E point, be the center of circle again with C, CE is that radius is made circular arc friendship CA in the F point, make the perpendicular bisector of AF, hand over OA and OD (or its extended line), make 1,2 two

symmetric points

3 and 4 in 1,2 two points, being that the center of circle is that radius is drawn arc with 2C with 2 and 4 respectively, is that the center of circle is that radius picture arc can be finished mapping with 1A with 1 and 3.The figure that this class drawing practice is drawn can only show the virgin curve shape approx, and in the mapping process, also can produce more boost line, need wipe one by one in the past finishing figure, owing to need couple together several sections different circular arcs of curvature smoothly, reduce plotting speed simultaneously.

Task of the present invention provides a kind of simple in structure, and is easy to use, and that can reduce boost line to a certain extent draws oval instrument specially, and it can accurately draw out ellipse under the situation of known long axis of ellipse and minor axis, need not connect circular arc.

Instrument of the present invention is according to the principle of " section line was for oval when cutting plane and cylinder axis tilted ", is made up of an axis fixed mount and a cylinder simulator.Technical solution of the present invention is: will draw links to each other with axis bar (5) with motion portion with line of ink marker pin (8), making the end of line of ink marker pin can be that track slides around the rotation of axis bar and with it with the certain distance of distance axle, the end of line of ink marker pin can be simulated in the space and be generated a cylindrical track like this, with fixed mount with the axis bar and the paper fixed angle of serving as cutting plane, it is exactly oval that thereby the rotation by motion portion makes the end of line of ink marker pin contact the curve gauge mark that forms a sealing on paper all the time with paper with sliding process, because the line of ink marker pin and the distance of axis bar and the angle of axis bar and paper can change, therefore can determine oval length semiaxis and eccentricity in theory arbitrarily, that is to say and utilize this instrument can draw the ellipse of any size and shape.

Describe the details and the working condition of the concrete instrument that proposes according to the present invention in detail below in conjunction with accompanying drawing.

This device comprises a fixed mount main body (3), there is a retractor device (2) at fixed mount main body middle part, this device is that a long nut connects two sections bolts that the precession direction is identical, and when the nut turn, two sections bolts keep can only stretching and can not reversing by interactional device.The fixed mount lower end is one section vertical definite bar (4) vertical with it, and it is also vertical with axis bar (5), and with the paper contact position hour hand pin is arranged.The fixed mount upper end links to each other with the axis bar by survey rate device (1).Survey rate device (1) is the device that a kind of dial and pointer are fixedly linked with fixed mount and axis bar respectively, when fixed mount and axis bar angle change, corresponding variation also takes place in the position of pointer on dial, and the numerical value that pointer is indicated on dial is the coarse value of oval centrifugal thing.Axis bar (5) is the smooth cylinder that there is stitch a lower end, and it is the tracks of motion portion main body.Motion portion main body comprises that a slip cap (6) and a connector (7) and line of ink marker pin (8) form, slip cap (6) can tightly be enclosed within on the axis bar and be that track and axis drive that line of ink marker pin (8) slides and rotation.As shown when vertical definite bar and paper (9) comprehensive engagement, the fixed mount center line is vertical with paper with the determined plane of axis bar center line, when the angle of the two was β, the angle of axis bar and paper was α, and the numeral of pointer indication is shown as cos α on the survey rate device.

Be AB to draw a major axis below, minor axis is CD, and the center is that the ellipse of O is an example, and the using method of this instrument is described.At first calculate oval eccentricity e (e=cos α) roughly according to the ratio of AB and CD, regulate the β angle and on survey rate device (1), demonstrate this numerical value, stitch with axis bar end is fixed in 0 point then, vertical definite bar and paper comprehensive engagement guarantee that instrument is vertical with paper, line of ink marker pin end is overlapped with C or D, by connector (7) this state is fixed again, make line of ink marker pin on straight line AB, regulate retractor device (2), line of ink marker pin is overlapped with A or B, determine this state, pis aller is guaranteed instrument and paper vertical fixing, another hand control slip cap (6) makes the end of line of ink marker pin (8) contact and rotate a week all the time with paper, and the closed curve of formation is exactly the ellipse that will draw.

Claims

1. by a fixed mount and a kind of special instrument of drawing ellipse that the cylinder simulator constitutes, it is characterized in that: fixed mount (3) links to each other with a transformable angle beta with axis bar (5) by survey rate device (1), motion portion is the parallel track motion with axis bar (5), be that axis rotates with the axis bar simultaneously, thereby the end motion that drives line of ink marker pin (8) forms a cylindrical track, remove to cut the cylinder that this simulation forms with a paper that serves as cutting plane, the section line performance is exactly oval on paper.

2. instrument according to claim 1, the lower end of fixed mount (3) are the vertical bar (4) of determining, feature is: vertical with determined of axis bar center line with the fixed mount center line.

3. instrument according to claim 1, survey rate device (1) is to be used for the rough device of determining the oval eccentricity of painting, it is characterized in that: dial links to each other with fixed mount or the arbitrary partial fixing of axis bar, and pointer and another part are fixedly linked, and the numerical value that pointer is indicated on dial is cos α.

4. instrument according to claim 1, retractor device (2) can be used to accurately determine the oval centrifugal thing of drawing, it is characterized in that: connect two sections bolts that the precession direction is identical by segment length's nut, two sections bolts can only stretch when two sections bolts rotated long nut by mutual independent action, can not reverse.

5. instrument according to claim 1 is characterized in that: axis bar (5) is smooth cylinder, and there is stitch its lower end.

6. instrument according to claim 1 is characterized in that: motion portion is made up of slip cap (6) jockey (7) and line of ink marker pin (8) three parts.

7. according to claim 1 or 6 described instruments, it is characterized in that: slip cap (6) matches with axis bar (5), and can seamlessly slide in the above and rotate.

8. according to claim 1 or 6 described instruments, it is characterized in that: line of ink marker pin (8) links to each other with slip cap (6) by connecting portion (7), and connecting portion (7) can be regulated and definite line of ink marker pin (8) is terminal and the distance of axis bar (5) center line.