CN105904886A

CN105904886A - Elliptic trammels

Info

Publication number: CN105904886A
Application number: CN201610257708.4A
Authority: CN
Inventors: 史雄凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-18
Filing date: 2016-04-18
Publication date: 2016-08-31

Abstract

The invention belongs to the technical field of educational equipment, and relates to a tool for drawing an ellipse, in particular to elliptic trammels. The elliptic trammels comprise a supporting shaft. A first rotating gear is concentrically hinged to the supporting shaft and provided with a transmission mechanism engaged with the first rotating gear. A second rotating gear is provided with a pen point through a connecting rod, and the connecting rod is positioned in the axial direction of the second rotating gear. The transmission ratio of the first rotating gear to the second rotating gear is 1:2. The distance between the center axis of the supporting shaft and the center axis of the second rotating gear is (a+b)/2, and the distance between the center axis of the second rotating gear and the center axis of the pen point is (a-b)/2, wherein a represents the length of the long axis of the ellipse, and b represents the length of the short axis of the ellipse. The elliptic trammels have the beneficial effects that drawing of the complete ellipse can be achieved through the transmission mechanism, during ellipse drawing, time is saved, and drawing is accurate.

Description

Ellipsograph

Technical field

Invention relates to educating equipment technical field, relates to a kind of instrument drawing ellipse, refers in particular to a kind of ellipsograph.

Background technology

Just as the instrument drawing circle is referred to as compasses, it is referred to as ellipsograph drawing oval instrument.Existing market Upper ellipsograph is broadly divided into two kinds, and the first is Novel ellipsograph, and the second is conventional elliptical rule.Can be no matter Being which kind of ellipsograph during actual use, effect is not highly desirable.During Students ' Learning, Special method is used to be capable of picture by compasses oval, but during teaching, it is desirable at blackboard Upper picture is oval and unrealistic, and current Ellipsograph structure is the most complex, heavier-weight, leads aborning Cause relatively costly, in teaching uses, due to overweight, cause inconvenient operation, blackboard is difficult to Playing fixing effect, draw and inconvenient, precision is the highest.It addition, some draw oval instrument and the technique of painting In, some compasses are made up of two feet, and a foot is fixed, and a foot revolves around its fixing foot at a certain distance Turn and can draw a circle and one section of camber line.When needs picture ellipse, need by means of elliptic curve plate or Use geometric method to obtain four centre points, use the camber line of four sections of different radiis to combine, draw ellipse, The most time-consuming, and the ellipse drawn is the most inaccurate.

Summary of the invention

The purpose of invention is for the problems referred to above, it is provided that a kind of simple in construction, easy to use, draws oval accurate, It is easy to be fixed on blackboard, the ellipsograph that cost of manufacture is low.

For reaching above-mentioned purpose, invention have employed following technical proposal: ellipsograph, including support shaft, described Support shaft on be hinged with swing pinion one with one heart, it is characterised in that described swing pinion one be provided with The drive mechanism of its engagement, one end that drive mechanism engages with swing pinion one is input, and the other end is defeated Go out end；The outfan of drive mechanism is provided with the swing pinion two that can engage with it, logical on swing pinion two Crossing connecting rod and be provided with nib, connecting rod is positioned the axial of swing pinion two；Swing pinion one and swing pinion Two gear ratios are 1: 2, and support shaft central axis is (a+b)/2 with the distance of swing pinion two central axis, Swing pinion two central axis is (a-b)/2 to the distance of nib central axis, and wherein a represents transverse Length, b represents the length of ellipse short shaft.

In above-mentioned ellipsograph, described drive mechanism includes input gear, input gear side and swing pinion One engagement, the opposite side of input gear is engaged with several drive links, and the other end of drive link is provided with output Gear；Output gear engages with swing pinion two.

In above-mentioned ellipsograph, described drive link is provided with two, is separately positioned on input gear both sides.

In above-mentioned ellipsograph, described input gear is 1: 1 with the gear ratio of swing pinion one；Output gear It is 1: 1 with the gear ratio of swing pinion two.

In above-mentioned ellipsograph, described connecting rod is provided with vernier, and this vernier is positioned swing pinion two, even Extension bar is connected with vernier slide..

In above-mentioned ellipsograph, described support shaft lower end becomes tip, and lower end is provided with location dish, tries to get to the heart of a matter in location End is provided with triangle polyester fibre frame, the oval initial point in location, support shaft lower end.

In above-mentioned ellipsograph, described input gear is mutually perpendicular to the axis of swing pinion one；Output gear It is mutually perpendicular to the axis of swing pinion two.

Compared with prior art, the advantage of invention is: be capable of complete picture by drive mechanism ellipse Circle, and not only saving time when drawing oval, and draw accurate, additionally this simple in construction, easy to use, connects Bar is positioned the length being axially capable of the short axle of time changing of swing pinion two, and output gear is at drive link The connection of upper slip, it is possible to realize the length of time changing major axis；And two drive links are not only able to realize ratio The transmission of example, and can the stablizing of total, location dish and triangle polyester fibre frame are not only able to realize ellipse The location of rule, and ensure that integrally-built compact.

Accompanying drawing explanation

In order to be illustrated more clearly that inventive embodiments or technical scheme of the prior art, below to by embodiment or In description of the prior art, the required accompanying drawing used is briefly described, it is therefore apparent that attached in describing below Figure is only some embodiments of invention, for those of ordinary skill in the art, is not paying creativeness On the premise of laborious, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is elliptic parameter principle explanatory diagram；

Fig. 2 is the axonometric chart of invention；

Tu3Shi partial perspective view；

Tu4Shi partial perspective view.

Detailed description of the invention

Below in conjunction with the accompanying drawing used in new embodiment, the technical scheme in inventive embodiments is carried out clearly Chu, complete description, it is clear that described embodiment only invents a part of embodiment rather than complete The embodiment in portion.Based on the embodiment in invention, those of ordinary skill in the art are not making creative labor The every other embodiment obtained under dynamic premise, broadly falls into the scope of invention protection.

Coaptation by following ellipse, it is possible to draw the relation between relevant parameter, as it is shown in figure 1, Respectively with a, b (a ＞ b ＞ 0) be radius make two circles.Point B is the intersection point of big radius of circle OA and roundlet, mistake Point A makees the vertical Ox of AN, and intersection point is N, crosses some B and is perpendicular to AN as BM, and intersection point is M.

Assuming that the midpoint of AB is P, PM is the center line of right angled triangle ABM.

So BP=PA=PM, if a length of 1.So 1=(| OA |-| OB |)/2, it may be assumed that 1=(a-b)/2；(the most ellipse The minor axis length of compasses).

It is assumed that L=OP=| OB |+| BP |, it may be assumed that L=b+1=(a+b)/2；(i.e. the long axis length of ellipsograph). Because BP=PM, so triangle BPM is isosceles triangle；So ∠ PBM=∠ PMB；Because BM//Ox； So ∠ PBM=∠ AON, because exterior angle that ∠ APM is triangle BPM；So ∠ APM=∠ PBM+ ∠ PMB=2 ∠ PBM=2 ∠ AON；That is, 2 times of the velocity of rotation that velocity of rotation is major axis of short axle.

Embodiment one

As shown in Figure 2,3, 4, ellipsograph, including support shaft 1, the support shaft lower end described in support shaft 1 sets There is location dish 2, and lower end becomes tip.Position end of trying to get to the heart of a matter and be provided with triangle polyester fibre frame 3.Location dish and support shaft Central axis is arranged on same axis, support shaft be arranged over handrail 6, in described support shaft with one heart Being hinged with swing pinion 1, described swing pinion one is provided with the drive mechanism 5 engaged, driver One end that structure engages with swing pinion 1 is input 7, and the other end is outfan 8.The output of drive mechanism End is provided with the swing pinion 2 10 that can engage with it, and swing pinion two is provided with nib by connecting rod 11 12, connecting rod is positioned the axial of swing pinion two；Described connecting rod is provided with vernier 13, and this vernier is fixed Being positioned at swing pinion two, it is ensured that when swing pinion two rotates, vernier also rotates, and connecting rod is with vernier slide even Connect, it is simple to conveniently determine that the length scale of short axle, swing pinion one and swing pinion two gear ratio are 1: 2, Support axle central axis is (a+b)/2 with the distance of swing pinion two central axis, swing pinion two central axis Distance to nib central axis is (a-b)/2.

Drive mechanism includes that input gear 14, input gear side engage with swing pinion one, input gear Being engaged with several drive links 15 on opposite side, in the technical program, described drive link is provided with two, point It is not arranged on input gear both sides.The other end of drive link is provided with output gear 16；Output gear and rotary teeth Wheel two engagement.Described support shaft is inverted L-type, and input gear is hinged on its surface, input gear It is positioned the coaxial direction of support shaft；Input gear is positioned the axial of drive link, and output gear is at drive link Upper slip.At axially arranged locating piece in support shaft, input gear is positioned the axial of drive link, it is ensured that defeated Enter gear location, do not slide during use, and output gear at one end slides, it is achieved the change of long axis length.

Input gear is 1: 1 with the gear ratio of swing pinion one；Output gear and the gear ratio of swing pinion two It is 1: 1.Described input gear is mutually perpendicular to the axis of swing pinion one；Output gear and swing pinion The axis of two is mutually perpendicular to, and they are mutually perpendicular to while ensureing that total is stable, be also convenient for installing and Dismounting.

Embodiment two

The technical program is with the difference of embodiment one, the axial direction of output gear positioning transmission bar, defeated Enter gear to slide on drive link.Realizing the change of long axis length, remaining technical scheme is similar with embodiment one, Too much repeating the most is not made at this.

The foregoing is only invention preferred embodiment, not in order to limit invention, all spirit in invention Within principle, any modification, equivalent substitution and improvement etc. done, should be included in the protection model of invention Within enclosing.

Claims

1. ellipsograph, including support shaft, described support shaft is coaxially hinged with swing pinion one, its feature Being, described swing pinion one is provided with the drive mechanism engaged, drive mechanism and swing pinion one One end of engagement is input, and the other end is outfan；The outfan of drive mechanism is provided with can be nibbled with it The swing pinion two closed, swing pinion two is provided with nib by connecting rod, and connecting rod is positioned swing pinion Two axial；Swing pinion one and swing pinion two gear ratio are 1: 2, support shaft central axis and swing pinion The distance of two central axis is (a+b)/2, and swing pinion two central axis to the distance of nib central axis is (a-b)/2, wherein a represents the length of transverse, and b represents the length of ellipse short shaft.

Ellipsograph the most according to claim 1, it is characterised in that described drive mechanism includes input Gear, input gear side is engaged with swing pinion one, the opposite side of input gear is engaged with several and passes Lever, the other end of drive link is provided with output gear；Output gear engages with swing pinion two.

Ellipsograph the most according to claim 2, it is characterised in that described drive link is provided with two, It is separately positioned on input gear both sides.

Ellipsograph the most according to claim 1, it is characterised in that described connecting rod is provided with vernier, This vernier is positioned swing pinion two, and connecting rod is connected with vernier slide.

Ellipsograph the most according to claim 1, it is characterised in that described support shaft lower end becomes tip, And lower end is provided with location dish, positions end of trying to get to the heart of a matter and be provided with triangle polyester fibre frame, the oval initial point in location, support shaft lower end.

Ellipsograph the most according to claim 2, it is characterised in that described input gear and rotary teeth The axis of wheel one is mutually perpendicular to；Output gear is mutually perpendicular to the axis of swing pinion two.

Ellipsograph the most according to claim 2, it is characterised in that described support shaft is inverted L Type, and input gear is hinged on its surface, input gear is positioned the coaxial direction of support shaft.

Ellipsograph the most according to claim 7, it is characterised in that described input gear is positioned to pass Lever axial, output gear slides on drive link.

Ellipsograph the most according to claim 7, it is characterised in that described output gear positioning transmission The axial direction of bar, input gear slides on drive link.