JPH0331160B2

JPH0331160B2 -

Info

Publication number: JPH0331160B2
Application number: JP59054331A
Authority: JP
Inventors: Koichi Yamazaki
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-03-23
Filing date: 1984-03-23
Publication date: 1991-05-02
Also published as: JPS60198299A

Description

【発明の詳細な説明】本発明は、楕円を製図するためのコンパスに関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compass for drafting ellipses.

従来楕円を製図する為のコンパスに関する発明
は皆無という訳ではない。 This does not mean that there have been no inventions related to compasses for drafting ellipses.

例えば特公昭53−35495号公報に示される楕円
コンパスは、第１図のグラフに示すように特定の
円につき（半径をａとする。）、一定方向（第１図
ではｙ軸方向。）に弦の長さを定比率（ｂ／ａ倍
とする。但し、ｂ＜ａである。）で短縮した点の
軌跡を描いた場合には楕円となること（第１図に
おいてx²／a²＋y²／b²＝１と表示されている。）
を利用している。 For example, the elliptical compass shown in Japanese Patent Publication No. 53-35495, as shown in the graph of FIG. If the locus of a point shortened by a fixed ratio (b/a times the length of the string, b<a) is drawn, it will become an ellipse (in Figure 1, x ² /a ² +y ² /b ² = 1 is displayed.)
is used.

前記発明に於ては、第１１図に示すように、下
端に製図用画面に挿入する針を有する垂直固定用
の支柱１を設け、該支柱１に対し、自転軸２１を
方向自在とした状態で支えながら、自転軸２１と
直行する回転腕２２に、下端に書穂３１を有し、
長さを調整自在とした可変ペン軸３を回転自在に
支持させる構成である。 In the above invention, as shown in FIG. 11, a vertical fixing column 1 having a needle inserted into a drafting screen at the lower end is provided, and the rotation axis 21 is made freely directional with respect to the column 1. A rotating arm 22 that is perpendicular to the rotational axis 21 has a writing tip 31 at the lower end while supporting it.
It is configured to rotatably support a variable pen shaft 3 whose length is freely adjustable.

しかし、このような構成に於ては、支柱１は、
常に製図面に対し垂直に維持しなければならない
にも拘らず、これが単に先端の針によつて製図面
に挿入されているだけであることから、十分安定
した垂直状態を維持することは困難である。 However, in such a configuration, the pillar 1 is
Although it must always be kept perpendicular to the drawing, it is difficult to maintain a sufficiently stable vertical position because it is simply inserted into the drawing by the needle at the tip. be.

又、可変ペン軸３も又、製図面に対し垂直に維
持することが要求されるにも拘らず、この点に関
する工夫も行われていない。 Further, although the variable pen shaft 3 is also required to be maintained perpendicular to the drawing, no efforts have been made in this regard.

更には、可変ペン軸３の軸部３３が回転腕２２
によつて支持される位置が固定している為、喩え
可変ペン軸３の長さが調整自在であるとしても、
楕円の大きさを自由に変形したり又は楕円の長軸
と短軸とを変化させた場合、これに十分適応する
ことができなかつた。 Furthermore, the shaft portion 33 of the variable pen shaft 3 is connected to the rotary arm 22.
Since the position supported by the pen is fixed, even if the length of the variable pen shaft 3 is adjustable,
When the size of the ellipse is freely changed or the major and minor axes of the ellipse are changed, it is not possible to sufficiently adapt to this.

本願は、前記発明のこのような欠点を克服し、
安定した状体でだ円を描き、且つ可変ペン軸の軸
部を回転腕が支持する位置を調整自在とした装置
を提供することを目的としている。 The present application overcomes these drawbacks of the said invention and
It is an object of the present invention to provide a device that draws an ellipse with a stable shape and can freely adjust the position where a rotary arm supports the shaft portion of a variable pen shaft.

以下図面に従つて本発明の構成及び作動につい
て説明する。 The configuration and operation of the present invention will be explained below with reference to the drawings.

第２ａ，ｂ図は、本発明の基本構成を示す側面
図及び上面図であるが、本発明の基本構成は、こ
れらの図面が示すように、支柱１と作動部２と可
変ペン軸３とから成る。 Figures 2a and 2b are a side view and a top view showing the basic structure of the present invention, and as shown in these drawings, the basic structure of the present invention includes a support 1, an actuating part 2, a variable pen shaft 3, Consists of.

支柱１は、周囲に広がつた固定脚部１１を有
し、上部において、作動部２の自転軸２１を、支
点２１１を介して、方向を調整自在として支持す
る。 The support column 1 has a fixed leg section 11 that extends around the circumference, and supports the rotation axis 21 of the actuating section 2 at its upper part via a fulcrum 211 so that the direction thereof can be adjusted.

第２ａ，ｂ，ｃ図に示す固定脚部１１は、下端
部が略円弧状を成し、支柱１は、一つの円弧状を
成す固定脚部１１から、逆Ｖ字型を成して、上方
に於て一体となり、横方向に突出した腕１２にお
いて、自転軸２１を支持している。 The fixed leg part 11 shown in FIGS. 2a, b, and c has a substantially arc-shaped lower end, and the support column 1 forms an inverted V shape from one arc-shaped fixed leg part 11. The rotation axis 21 is supported by an arm 12 that is integrated above and projects laterally.

固定脚部１１の形状は、前記第２ａ，ｂ，ｃ図
に示す形状に限定される訳ではなく、例えば第１
２図に示すように、カメラを支える三脚と同様
に、三方向に広がつた脚部１１が、一箇所に於て
一体となつて支柱１を構成し、自転軸２１を支持
する実施例も考えられる。 The shape of the fixed leg portion 11 is not limited to the shape shown in FIGS. 2a, b, and c.
As shown in Figure 2, similar to a tripod that supports a camera, there is also an embodiment in which legs 11 extending in three directions are integrated at one place to form a support 1 and support a rotation axis 21. Conceivable.

固定脚部１１の形状、構造は、前記の如き実施
例に限定される訳ではないが、固定脚部１１を静
止針又は止め金等で製図を行う平面に固着するな
らば、支柱が安定し、確実な製図の作業を行うこ
とができるので便利である。 The shape and structure of the fixed leg portion 11 are not limited to the embodiments described above, but if the fixed leg portion 11 is fixed to the drawing plane with a stationary needle or a clasp, the support will be stable. This is convenient because it allows reliable drafting work.

何れにせよ、周囲に広がつた固定脚部１１によ
つて支柱１が支えられているので、第１１図に示
す従来の発明に係る楕円コンパスに比し、支柱１
は確実に製図面に対し垂直に支持され、自転軸２
１を、安定した状態で作動することができる。 In any case, since the support column 1 is supported by the fixed leg part 11 that spreads around the circumference, the support column 1 is
is surely supported perpendicular to the drawing, and the rotation axis 2
1 can be operated in a stable state.

作動部２の自転軸２１は、支点２１１を中心と
して回転することによつて方向を調整すると共
に、第２ａ図の〓方向の矢印に示すように、中心
線２１２に沿つて自転自在であるように設計され
ている。 The rotation axis 21 of the actuating unit 2 adjusts its direction by rotating around a fulcrum 211, and is also rotatable along a center line 212, as shown by the arrow in the downward direction in FIG. 2a. It is designed to.

自転軸２１が自転自在である為の具体的構成の
実施例を第３図に示す。 FIG. 3 shows an example of a specific configuration for allowing the rotation axis 21 to rotate freely.

第３図では、自転軸２１の内支点２１１を介し
て支柱１に固着されている部分２１３の両側にボ
ールベアリング２１４を設け、これを介して上部
の把手部分２１５と下部部分２１６を支柱１に固
着されている部分２１３と接続し、しかも前記２
１３内部で把手部分２１５の回転を下部２１６に
伝達する軸２１７を設けることによつて可能とな
る。 In FIG. 3, ball bearings 214 are provided on both sides of a portion 213 that is fixed to the column 1 via the inner fulcrum 211 of the rotation shaft 21, and an upper handle portion 215 and a lower portion 216 are attached to the column 1 via these. It is connected to the fixed part 213, and the above 2
This is made possible by providing a shaft 217 inside 13 that transmits the rotation of the handle portion 215 to the lower part 216.

自転軸２１の下端はこれと直交する形状で回転
腕２２が固着され、回転腕２２も自転軸２１の自
転に伴ない、中心線２１２を中心として、自転す
ることになる。 A rotary arm 22 is fixed to the lower end of the rotation axis 21 in a shape orthogonal thereto, and the rotation arm 22 also rotates about the center line 212 as the rotation axis 21 rotates.

可変ペン軸３は、下端に書穂３１及び、書穂３
１を製図面に対し直角に維持する為の支持脚３２
を有すると共に、上端部は、腕２２に支持位置を
調整自在かつ回転自在に支持され、軸部３３は、
上端部の支持される位置が腕２２に沿つて移動す
るに伴ない、弾性的に長さを調整自在とするよう
設計されている。 The variable pen shaft 3 has a writing tip 31 and a writing tip 3 at the lower end.
Support legs 32 for keeping 1 perpendicular to the drawing
The upper end part is rotatably supported by the arm 22 in a freely adjustable support position, and the shaft part 33 is
It is designed to be elastically adjustable in length as the supported position of the upper end moves along the arm 22.

支持脚３２は、書穂３１と相俟つて可変ペン軸
３を支持することによつて、可変ペン軸３の製図
面に対する方向を直角に支持し、これによつて書
穂３１自体製図面に対し直角に支持されることに
なる。 The supporting leg 32 supports the variable pen shaft 3 together with the writing tip 31, thereby supporting the direction of the variable pen shaft 3 at right angles to the drawing, thereby allowing the writing tip 31 itself to be aligned with the drawing. It will be supported at right angles.

尚、第２ａ図において、支持脚３２の下端に回
転コロ３２２を設け、製図面上の移動を円滑にさ
せているが、これは不可欠という訳ではない。 In FIG. 2a, a rotating roller 322 is provided at the lower end of the support leg 32 to facilitate smooth movement on the drawing board, but this is not essential.

即ち、固い剛体であつて、製図面との間に一定
の滑りを有する棒状の物体であつても、支持脚３
２として使用され得る。 That is, even if the object is a hard rigid body and has a certain slippage between it and the drawing, the supporting legs 3
2 can be used.

回転腕２２が、可変ペン軸３の軸部３３を支持
する位置は、調整自在であると共に回転自在とす
るが、このような構成の実施例は、例えば第４ａ
図、第４ｂ図に示すように、回転腕２２の長さ方
向に孔２３を一列に配列し、少なくとも先端に螺
子溝が存在する中心軸２３１を孔２３の内の特定
の孔、軸部３３及び摺動板２３４に挿通させ、後
端部をナツト２３２によつて留め、中心軸２３１
の両側に於いて他のボルト２３５及びナツト２３
６によつて軸部３３及び摺動板２３４を回転腕２
２を挟んだ状態で結合させる構成、第４ｃ図、第４ｄ図に示すように、回転腕２２
の長さ方向に摺動溝２４を設け、少なくとも先端
及び中間部分に螺子溝が存在する中心軸２４１
を、該摺動溝２４、摺動板２４４及び軸部３３に
挿通させて、中心軸２４１のヘツドの部分と回転
腕２２とを摺動溝２４より広幅のナツト２４３に
よつて締付け、中心軸２４１と回転腕２２とを固
着し、更に中心軸２４１の後端付近を、軸部３３
に挿通して、該後端を他のナツト２４２によつて
留め、中心軸２４１の両側に於いて他のボルト２
４５及びナツト２４６によつて摺動板２４４及び
軸部３３を、回転腕２２及びナツト２４３を挟ん
だ状態で結合する構成が考えられる。 The position at which the rotary arm 22 supports the shaft portion 33 of the variable pen shaft 3 is adjustable and rotatable.
As shown in FIG. 4b, the holes 23 are arranged in a line in the length direction of the rotary arm 22, and the central shaft 231, which has a threaded groove at least at the tip, is connected to a specific hole among the holes 23, and the shaft portion 33 and the sliding plate 234, the rear end is fastened with a nut 232, and the central shaft 231
Other bolts 235 and nuts 23 on both sides of
6, the shaft portion 33 and the sliding plate 234 are connected to the rotating arm 2.
As shown in FIGS. 4c and 4d, the rotary arm 22 is connected in a sandwiched state.
A central shaft 241 with a sliding groove 24 in the length direction and a threaded groove at least at the tip and middle part.
is inserted through the sliding groove 24, the sliding plate 244, and the shaft portion 33, and the head portion of the central shaft 241 and the rotary arm 22 are tightened with a nut 243 wider than the sliding groove 24, and the central shaft 241 and the rotary arm 22, and furthermore, the vicinity of the rear end of the central shaft 241 is fixed to the shaft portion 33.
The rear end is fastened with another nut 242, and other bolts 2 are attached on both sides of the central shaft 241.
45 and the nut 246, the sliding plate 244 and the shaft portion 33 may be connected with the rotary arm 22 and the nut 243 sandwiched therebetween.

第４ａ図、第４ｂ図に示す実施例に於て、摺動
板２３４に中心軸２３１を挿通させ、且つ該摺動
板２３４と軸部３３とによつて回転腕２２を挟ん
だ状態とした上で、更に、その両側に於いてボル
ト２３５ナツト２３６によつて結合させるのは、
これによつて回転腕２２と摺動板２３４及び軸部
３３との間の接触摩擦を増大させ、回転腕２２と
軸部３３との間で設定した角度を変化し難くする
ためである。 In the embodiment shown in FIGS. 4a and 4b, the center shaft 231 is inserted through the sliding plate 234, and the rotating arm 22 is sandwiched between the sliding plate 234 and the shaft portion 33. Above, further connected by bolts 235 and nuts 236 on both sides,
This is to increase the contact friction between the rotary arm 22, the sliding plate 234, and the shaft portion 33, and to make it difficult to change the angle set between the rotary arm 22 and the shaft portion 33.

又第４ｃ図、第４ｄ図の実施例に於て中心軸２
４１の両側にボルト２４５ナツト２４６の結合を
行なうのもまた同様の理由による。 In addition, in the embodiments shown in FIGS. 4c and 4d, the central axis 2
The reason for connecting bolts 245 and nuts 246 to both sides of 41 is also for the same reason.

尚、軸部３３を回転腕２２に支持する方法は、
前記実施例に限定される訳ではない。 Note that the method for supporting the shaft portion 33 on the rotating arm 22 is as follows.
The present invention is not limited to the above embodiments.

可変ペン軸の軸部３３は、例えば、第５ａ，ｂ
図に示すように、中空部３３２とこれに嵌合する
部分３３１を設けることによつてなる。尚、第５
ｂ図では、中空部３３２内に、弾性バネ３３３を
設け、前記の部分３３１を弾性バネ３３３に係合
させることによつて、長さを弾性的に調整自在と
しているが、バネ３３３を設けることは必ずしも
必要という訳ではない。 The shaft portion 33 of the variable pen shaft is, for example, 5th a, b
As shown in the figure, this is achieved by providing a hollow portion 332 and a portion 331 that fits into the hollow portion 332. Furthermore, the fifth
In Figure b, an elastic spring 333 is provided in the hollow portion 332, and the length can be elastically adjusted by engaging the portion 331 with the elastic spring 333. is not necessarily necessary.

以上のような基本構成の本発明に於て自転軸２
１の方向を定め、かつ可変ペン軸３の上端支持部
３４のボルト及びナツトを締めて、回転腕２２に
回転自在に固着し、自転軸２１を中心線２１２を
中心として自転させた場合には、回転腕２２の可
変ペン軸３の軸部３３の内中心軸２３１又は２４
１によつて固着された部分は、円軌跡を描くが、
可変ペン軸３の下端の書穂３１が描く軌跡は、前
記円軌跡に対し、自転軸２１に沿つた平面方向に
ついては、常にSinθ倍（θは製図面と自転軸との
間の角度）だけ弦の幅が短縮されるのに対し、前
記平面と直交する平面方向については、このよう
な短縮が行われずに、同一の弦の幅となることか
ら、第６図に於て長径をａ（ａは腕部２２の可変
ペン軸の上端を固定した部分が描く円軌道の半径
の大きさ）とし、短径をaSinθとする楕円形状を
描くことになるのである。 In the present invention having the basic configuration as described above, the rotation axis 2
1, and tighten the bolt and nut of the upper end support part 34 of the variable pen shaft 3 to rotatably fix it to the rotating arm 22, and rotate the rotating shaft 21 around the center line 212. , the inner central shaft 231 or 24 of the shaft portion 33 of the variable pen shaft 3 of the rotary arm 22
The part fixed by 1 draws a circular locus, but
The locus drawn by the tip of paper 31 at the lower end of the variable pen shaft 3 is always equal to the circular locus multiplied by Sinθ in the plane direction along the rotation axis 21 (θ is the angle between the drawing and the rotation axis). While the width of the string is shortened, in the plane direction perpendicular to the plane, the width of the string remains the same without such shortening, so in FIG. A is the radius of the circular orbit drawn by the portion of the arm 22 where the upper end of the variable pen shaft is fixed), and an elliptical shape with the minor axis aSinθ is drawn.

ところで本発明においては、書穂３１を確実に
製図面に対し直角に支持することが必要である
が、ややもすると、製図中に可変ペン軸３が振れ
て製図面と直角でなくなる危険性がある。 By the way, in the present invention, it is necessary to reliably support the writing tip 31 at right angles to the drawing, but if something happens, there is a risk that the variable pen shaft 3 will swing during drawing and will no longer be at right angles to the drawing. be.

第７ａ図の側面図および第７ｂ図の下面図は、
書穂３１の周囲に３個の支持脚３２を設けた実施
例を示すが、これによつて可変ペン軸３が振れる
危険性がなくなり、書穂３１は製図面に対し、確
実に直角に保持することができるので、極めて便
利である。 The side view in Figure 7a and the bottom view in Figure 7b are
An embodiment is shown in which three support legs 32 are provided around the writing tip 31, which eliminates the risk of the variable pen shaft 3 swinging and ensures that the writing tip 31 is held at right angles to the drawing. It is extremely convenient because it can be done.

尚、書穂３１の周知に設ける支持脚の類は第７
ａ，ｂ図のように３個に限らず２個以上の色々な
個数が考えられる。 In addition, the kind of supporting legs that are commonly provided for the calligraphy 31 is the seventh type.
As shown in figures a and b, the number is not limited to three, but various numbers of two or more are possible.

一方、特に製図面が水平の場合には、可変ペン
軸３の下端部に水平計を取付けることによつて、
書穂３１が製図面に対し直角に保持されているか
否かを判断することも可能である。 On the other hand, especially when the drawing is horizontal, by attaching a level gauge to the lower end of the variable pen shaft 3,
It is also possible to determine whether the writing ear 31 is held at right angles to the drawing.

前記のような、支持脚３２に関する実施例とは
別に、作動部２および可変ペン軸３が製図中に振
動等が生ぜず、安定して作動させるための実施例
を第８，９図に示す。 In addition to the above-mentioned embodiment regarding the support leg 32, an embodiment is shown in Figs. 8 and 9 in which the operating portion 2 and the variable pen shaft 3 are operated stably without vibration during drawing. .

第８図の実施例は、自転軸２１と回転腕２２と
が直交し、かつ固着する部位に中心針４を回転腕
２２との角度を調整自在に固着し、中心針４の先
端を、製図面に差込むならば、作動部２の作動は
安定したものとなる。 In the embodiment shown in FIG. 8, the rotation axis 21 and the rotating arm 22 are perpendicular to each other, and the center needle 4 is fixed to the fixed part so that the angle with the rotating arm 22 can be freely adjusted. If it is inserted into the surface, the operation of the operating part 2 will be stable.

尚、この場合には可変ペン軸３は中心針４の周
囲を移動して、楕円を製図することになる。 In this case, the variable pen shaft 3 moves around the center needle 4 to draw an ellipse.

第９図に示す実施例は、回転腕２２を自転軸２
１とＴ型に直交させ、可変ペン軸３とは別に製図
面上を移動する為の可変軸５を回転腕２２に支持
位置を調整自在かつ回転自在とし、しかも長さを
調整自在として、自転軸２１に関し、可変ペン軸
３と可変軸５とを反対側に支持させる実施例であ
るが、この実施例においては回転腕２２が、可変
ペン軸３と可変軸５とによつて、両側から支持さ
れるので、作動部２が作動中に振動する危険性は
極めて少ないものとなり、安定した製図作業を行
うとができる。 In the embodiment shown in FIG. 9, the rotating arm 22 is
1 and the T-shape, and a variable shaft 5 for moving on the drawing surface separately from the variable pen shaft 3 is made to be supported on the rotary arm 22 so that its support position can be adjusted and rotated, and its length can be adjusted freely. Regarding the shaft 21, in this embodiment, the variable pen shaft 3 and the variable shaft 5 are supported on opposite sides, but in this embodiment, the rotary arm 22 is supported from both sides by the variable pen shaft 3 and the variable shaft 5. Since it is supported, there is very little risk that the operating section 2 will vibrate during operation, allowing stable drafting work.

無論、可変軸５の下端に於ても、回転コロを設
け、製図面上の移動を円滑にすると便利である。 Of course, it is convenient to provide rotating rollers at the lower end of the variable shaft 5 to facilitate smooth movement on the drawing board.

ところで本発明の楕円製図用コンパスに於て、
製図された楕円の長径と短径との比率を決定する
のは、自転軸２１の方向であり、楕円の大きさ
は、可変ペン軸３の上端支持部３４が回転腕２２
に固着される位置によつて決定される。そこで、
要求される楕円の形状、即ち、長径と短軸の比率
（具体的には前記Sinθ）を定めるには、自転軸２
１の支柱１に対する角度を定めることによつて可
能となる。 By the way, in the elliptical drafting compass of the present invention,
The direction of the rotation axis 21 determines the ratio between the major axis and the minor axis of the drawn ellipse, and the size of the ellipse is determined by the rotation arm 22 of the upper end support part 34 of the variable pen shaft 3.
determined by the position to which it is fixed. Therefore,
To determine the required shape of the ellipse, that is, the ratio of the major axis to the minor axis (specifically, the above-mentioned Sinθ), the rotation axis 2
This is made possible by determining the angle of 1 with respect to the support 1.

第１０ａ図は、支柱１の製図面に直角に立脚し
ている部分にこのような角度の目盛を付した分度
計６を設けた実施例を示し、第１０ｂ図には、支
柱１につき、製図面と平行な部分に分度計６を設
けた実施例を示すが、これ等の分度計を併用して
用いても良い。 Fig. 10a shows an embodiment in which a protractor 6 with such angle scales is provided on the part of the support 1 that stands perpendicular to the drawing, and Fig. 10b shows the following for each support 1. Although an embodiment is shown in which a protractor 6 is provided in a portion parallel to the drawing, these protractors may be used in combination.

即ちこれらの分度計の目盛りに合わせて、自転
軸２１の方向を定めることによつて、可変ペン軸
３の書穂３１が描く楕円の超軸と短軸との比率が
定まる訳である。又分度計６に、自転軸２１の支
柱に固着されている部分２１３を別途固着させ、
いはば、支柱１の固着の補助的作用を行わせるこ
とも可能である。 That is, by determining the direction of the rotation axis 21 in accordance with the scales of these protractors, the ratio between the super axis and the minor axis of the ellipse drawn by the tip 31 of the variable pen shaft 3 is determined. In addition, the portion 213 that is fixed to the support of the rotation axis 21 is separately fixed to the protractor 6,
Alternatively, it is also possible to perform an auxiliary function for fixing the support column 1.

他方可変ペン軸３を腕２２に固着する位置を定
めるには、腕２２に目盛りを付し、これに合わせ
て可変ペン軸を固着する位置を調整するならば、
製図する楕円の全体の大きさを任意に設定するこ
とが可能となる。 On the other hand, in order to determine the position at which the variable pen shaft 3 is fixed to the arm 22, if a scale is attached to the arm 22 and the position at which the variable pen shaft is fixed is adjusted accordingly,
It becomes possible to arbitrarily set the overall size of the ellipse to be drawn.

以上のように本発明によつて希望する任意の形
状、大きさの楕円を周囲に広がつた固定脚部１１
を有する支柱１の安定した支持及び書穂３１と支
持脚３２との協働によつて、確実な作動によつて
描くことが可能となり、楕円の製図に於て極めて
大きな進歩をもたらすものである。 As described above, according to the present invention, the fixed leg portion 11 is formed around an ellipse of any desired shape and size.
The stable support of the support column 1 having the shape and the cooperation between the writing tip 31 and the supporting leg 32 make it possible to draw with reliable operation, resulting in an extremely large advance in the drawing of ellipses. .

[Brief explanation of the drawing]

第１図：円から楕円を得る原理を示す平面グラ
フ、第２ａ，ｂ，ｃ図：本発明の基本構成を示す
側面図及び上面図及び正面図、第３図：自転軸の
実施例の具体的構成を示す透視側面図、第４ａ
図：複数個の孔を配列した回転腕が支持位置を調
整自在とし、且つ回転自在として軸部を支持した
状態を示す実施例の側面図、第４ｂ図：第４ａ図
のＡ−A′方向の側断面図、第４ｃ図：摺動溝を
設けた回転腕が支持位置を調整自在とし、且つ回
転自在として軸部を支持した状態を示す実施例の
側面図、第４ｄ図：第４ｃ図のＡ−A′方向の側
断面図、第５ａ，ｂ図：可変ペン軸の長さを調整
自在とした構成を示す断面図、第６図：可変ペン
軸の上端の腕２２に固着された部位が描く円軌道
と、可変ペン軸の下端の書穂が描く楕円軌道との
関係を示す平面図、第７ａ，ｂ図：書穂の周囲に
支持脚部を設けた実施例を示す側面図および下面
図、第８図：作動の安定の為に、中心針を回転腕
に固着して設けた実施例を示す側面図、第９図：
作動の安定の為に、可変軸を回転腕に固着して設
けた実施例を示す側面図、第１０ａ，ｂ図：支柱
に自転軸の支柱に対する角度を明らかにする為の
目盛りを刻した分度計を設けた実施例を示す側面
図、第１１図：従来の楕円コンパスの構成を示す
側面図、第１２図：本願の固定脚部１１及び支柱
１の他の実用を示す側面図。１……支柱、１１……固定脚部、２……作動
部、２１……自転軸、２１１……支持部、２１２
……中心線、２１３……支持部によつて固着され
た部分、２１４……ボールベアリング、２１５…
…腕と直交する部位を有する自転軸の下方部、２
１６……自転軸の把手、２２……回転腕、３……
可変ペン軸、３１……書穂、３２……支持脚部、
３３……可変ペン軸の軸部、３３１……可変軸の
内バネと係合する部分、３３２……可変軸の内、
内部を中空とし、バネを収納する部分、３３３…
…弾性バネ、２３……回転腕に設けられた孔、２
３１……中心軸、２３２……ナツト、２３４……
摺動板、２３５……ボルト、２３６……ナツト、
２４……回転腕に設けられた摺動溝、２４１……
中心軸、２４２，２４３……ナツト、２４４……
摺動板、２４５……ボルト、２４６……ナツト、
４……中心針、５……可変軸、６……分度計。 Figure 1: Plane graph showing the principle of obtaining an ellipse from a circle, Figures 2a, b, and c: Side view, top view, and front view showing the basic configuration of the present invention, Figure 3: Specific example of the rotation axis Transparent side view showing the configuration, No. 4a
Figure: Side view of the embodiment showing a state in which a rotary arm with a plurality of holes arranged can freely adjust the support position and rotatably support the shaft, Figure 4b: A-A' direction in Figure 4a A side sectional view of the embodiment, Fig. 4c: A side view of the embodiment showing a state in which the rotary arm provided with a sliding groove can freely adjust the support position and rotatably supports the shaft part, Fig. 4d: Fig. 4c A side sectional view in the A-A' direction, Figures 5a and b: A cross-sectional view showing a configuration in which the length of the variable pen shaft can be adjusted freely, Figure 6: Fixed to the arm 22 at the upper end of the variable pen shaft. A plan view showing the relationship between the circular trajectory drawn by the part and the elliptical trajectory drawn by the tip of paper at the lower end of the variable pen shaft, Figures 7a and 7b: Side view showing an embodiment in which support legs are provided around the tip of the pen and a bottom view, Fig. 8: a side view, Fig. 9, showing an embodiment in which the central needle is fixed to the rotating arm for stable operation;
Figures 10a and 10b are side views showing an embodiment in which the variable shaft is fixed to the rotary arm in order to stabilize the operation: A scale is engraved on the support to clarify the angle of the rotation axis with respect to the support. FIG. 11: A side view showing the configuration of a conventional elliptical compass. FIG. 12: A side view showing another practical use of the fixed leg portion 11 and support 1 of the present application. DESCRIPTION OF SYMBOLS 1... Support column, 11... Fixed leg part, 2... Operating part, 21... Rotation axis, 211... Support part, 212
... center line, 213 ... portion fixed by support section, 214 ... ball bearing, 215 ...
...lower part of the rotation axis having a part orthogonal to the arm, 2
16... Handle of rotating shaft, 22... Rotating arm, 3...
variable pen shaft, 31... calligraphy, 32... support leg,
33...A shaft portion of the variable pen shaft, 331...A portion of the variable shaft that engages with the inner spring, 332...Of the variable shaft,
The part that is hollow inside and stores the spring, 333...
...Elastic spring, 23... Hole provided in rotating arm, 2
31... Central axis, 232... Nut, 234...
Sliding plate, 235...bolt, 236...nut,
24...Sliding groove provided in the rotating arm, 241...
Central axis, 242, 243... Nut, 244...
Sliding plate, 245...bolt, 246...nut,
4... Center needle, 5... Variable axis, 6... Protractor.

Claims

[Scope of Claims] 1. A column 1 supported by fixed legs extending around the periphery, a rotation axis 21 fixed at one point on the column 1 so as to be adjustable in direction, and a rotation shaft 21 fixed at one point on the column 1, and a rotation axis 21 perpendicular to the lower end thereof. The actuating part 2 has a fixed rotary arm 22, the position supported by the rotary arm 22 can be adjusted, and the shaft part 33 is rotatably supported, and the length can be adjusted. A variable pen shaft 3 is provided, and a writing tip 31 and a writing tip 3 are provided at the lower end of the variable pen shaft 3.
This compass for elliptical drafting is provided with support legs 32 for maintaining the variable pen shaft 3 at right angles to the drafting drawing in cooperation with the drawing compass 1. 2. The elliptical drawing compass according to claim 1, wherein the support leg 32 is provided with a rotating roller 322 at its lower end. 3. An elliptical drafting compass according to claim 1, characterized in that a slippery rod is used as the support leg 32. The writing tip 31 has a plurality of support legs 32 around it.
Claim 1 characterized in that it provides
Compass for elliptical drafting as described. 5. The compass for elliptical drafting according to claim 1, wherein the variable pen shaft 3 has a level gauge attached to its lower end. 6. The ellipse drawing according to claim 1, characterized in that the rotation axis 21 and the rotating arm 22 are perpendicular to each other, and the central needle 4 for inserting the tip into the drawing is rotatably fixed to the fixed part. compass. 7 The rotating arm 22 is orthogonal to the rotation axis 21 in a T-shape,
The ellipse drawing device according to claim 1, characterized in that the variable shaft 5 is supported by the rotary arm 22 at a position opposite to the variable pen shaft 3 with respect to the rotation shaft 21 so that the support position thereof can be adjusted and rotated. compass. 8. The compass for elliptical drawing according to claim 1, characterized in that the support 1 is provided with a protractor 6 having a scale for determining the angle of the rotation axis 21 with respect to the support 1. 9. The ellipse according to claim 1, characterized in that the support 1 is provided with a protractor 6 having a scale that determines the angle of the rotation axis 21 with respect to the support 1, and the rotation axis 21 is fixed to the protractor 6. Drafting compass. 10. An elliptical drawing compass according to claim 1, wherein the fixed leg has a lower end forming an arc. 11. The fixed leg has three legs as its legs. The compass 12 for elliptical drawing according to claim 1 is characterized in that the shaft portion 33 is supported by the rotary arm 22, and the holes 23 are arranged in a line in the length direction of the rotary arm 22, The central shaft 231, which has a threaded groove at least at its tip, is inserted through a specific hole of the holes 23, the shaft portion 33, and the sliding plate 234, and the rear end is inserted into the nut 23.
2, and the shaft portion 3 is fastened by other bolts 235 and nuts 236 on both sides of the central shaft 231.
3 and the sliding plate 234 are coupled with the rotary arm 22 in between. A sliding groove 24 is provided in the longitudinal direction of the rotary arm 22.
The central shaft 241, which has a threaded groove at least at the tip and the intermediate portion, is inserted through the sliding groove 24, the sliding plate 244, and the shaft portion 33, and the central shaft 241
The head portion of the rotary arm 22 is tightened with a nut 243 wider than the sliding groove 24, and the central shaft 24 is tightened.
1 and the rotary arm 22, and furthermore, the rear end of the center shaft 241 is inserted into the shaft portion 33, and the rear end is fastened with another nut 242. The elliptical drawing according to claim 1, characterized in that the sliding plate 244 and the shaft portion 33 are connected by a bolt 245 and a nut 246 with the rotary arm 22 and the nut 243 sandwiched therebetween. compass