CN85202416U

CN85202416U - Model a ellipsograph

Info

Publication number: CN85202416U
Application number: CN 85202416
Authority: CN
Inventors: 陈智海
Original assignee: No3 Design Office No3 Research Inst Ministry Of Space Industry
Current assignee: No3 Design Office No3 Research Inst Ministry Of Space Industry
Priority date: 1985-06-24
Filing date: 1985-06-24
Publication date: 1986-07-09

Abstract

The utility model discloses a model An ellipsograph, and belongs to an instrument for drawing ellipses. The appearance and the use method of the model An ellipsograph are similar to those of a usual drop compass. The model An ellipsograph mainly comprises a center rod, a rotary frame rotated around the center rod, three gears which are arranged in the rotary frame and are in mesh, a rotary shaft fixed to a pinion gear, a transmission shaft transmitting the motion of the pinion gear, a rotary rod, a rotary sleeve, a universal joint, a pen clamp, a scribing pen, an angle regulating rod which is used for regulating the size of an ellipse, a sleeve frame which is used for fixing the angle regulating rod, etc. The model An ellipsograph is used conveniently, two angles only need to be changed, the major axis and the minor axis can be determined, and the model An ellipsograph can draw the complete ellipse by one stroke. The model An ellipsograph can be optionally rotated to repeatedly deepen to regulate the concentration of a line drawn.

Description

Model A ellipsograph

Ellipsograph-A type belongs to a kind of instrument of drawing oval usefulness.For a long time, lack ellipsograph in the drawing instrument always.Various ellipsograph inventions in the past, perhaps complex structure involves great expense, and perhaps inconvenient operation once can only be drawn half ellipse etc., lacks practicality.

The purpose of this utility model is to provide a kind of cost not too high, manipulate easy (similar with compasses commonly used), but unicursal goes out the novel drawing instrument of complete ellipse.

This utility model is achieved in that and is provided with disk rotation again when fixing point is made circular motion (revolution), the revolution radius of supposing disk is R, on the disk arbitrarily the rotation radius of any be r, when disk sense of rotation and revolution direction opposite (inverse relationship), and the angular speed of rotation is one times (times angular dependence) of revolution angular speed, can prove by mathematical analysis that then the movement locus of arbitrfary point meets following equation on the disk:

(X ²)/(（R+r) ²) ＋ (y ²)/(（R-r) ²) ＝1

This is a standard elliptic, and wherein R+r is oval major semiaxis, and R-r is oval semi-minor axis.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Accompanying drawing 1 is the principle assumption diagram of this instrument.

Accompanying drawing 2 is cutaway views of rotating turret 9.

Accompanying drawing 3 is cutaway views of stock 10.

With reference to Fig. 1, Fig. 2, Fig. 3, a center-pole 19 that passes whole ellipsograph center and have keyway 29, its upper end is fixed with land 1, and two pins are fixed by pin card 27 in the lower end, and a pin wherein is on the center line of center-pole 19, this cushion is on the center of circle of ellipse during use, and another cushion is on the long axis of ellipse line.Be with rotating turret 9 on the center-pole 19, other parts of this instrument all are connected on the rotating turret 9, and rotate around center-pole 19 with rotating turret 9, three intermeshed gear are housed: gear wheel 5, breast wheel 7, pinion 6 at the middle part of rotating turret 9.Gear wheel 5 is enclosed within on the center-pole 19, the two central lines, and it matches by the keyway 29 on key piece 3 and the center-pole 19, makes gear wheel 5 to slide up and down along center-pole 19, and can not rotate.The number of teeth of gear wheel 5 is times of pinion 6 numbers of teeth, like this, when rotating turret 9 when center-pole 19 turns over a θ angle clockwise, pinion 6 will relatively rotate frame 9 inhours and turn over one 2 θ angle, satisfy foregoing inverse relationship and times angular dependence, thus on the pinion 6 arbitrarily the movement locus of any will be an ellipse.For the motion that makes pinion 6 is delivered to metal marker 25, the rotating shaft 4 with pinion 6 fixes by two universal joints 17, connects power transmission shaft 16, bull stick 22; Bull stick 22 is enclosed within 21 li of pivoted housings, and its lower end is connected with pen clip 23, fixing metal marker 25 on the pen clip.For eliminating the not angular speed error of average rate generation of two universal joint transmissions, should make bull stick 22 parallel shafts 4.

In the bottom of rotating turret 9 stock 10 is housed, for regulating the angle modulation bar 15 of oval size, the one end is fixed on the stock 10, the other end is connected on the pivoted housing 21 by screw 20, bull stick 22 has toroidal cavity 30, screw 20 will stretch in the groove, can rotate freely for 21 li at pivoted housing with assurance bull stick 22, and can not axially-movable.In order arbitrarily to change oval size, and in adjusting oval big or small process and paint in the oval process, all the time guarantee that bull stick 22 is parallel with rotating shaft 4, promptly bull stick 22 in vertical state, four hinge points that can constitute parallelogram by four joints at angle modulation bar 15 and power transmission shaft 16 two ends guarantee.

For the nib that makes metal marker 25 contacts with paper all the time, rotating turret 9 and the whole movable members that is connected with it should move up and down along center-pole 19, in the lower end of rotating turret 9 card nut 14 are housed, bar card 13 for this reason.After unclamping card nut 14, bar card 13 also unclamps thereupon, so rotating turret 9 just can move up and down, when tightening card nut 14, bar card 13 is just embraced center-pole 19, so rotating turret 9 can only rotate around center-pole 19.By regulating metal marker 25 concentration that drawn lines, between bar card 13 and rotating turret 9, spring 12 is housed, control the deflection of rotating part by adding the size that is pressed in power on the rotating turret 9 like this, to change metal marker 25 depth of the bar of being rule on paper.

The using method of A type ellipsograph is as follows:

On drawing, draw oval center line, measure oval major semiaxis and semi-minor axis thereon, find out the mid point of the difference of length semiaxis.With two pins on the pin card 27, one is inserted in ellipse in the heart, and another root is inserted on the long axis.Earlier that pen clip 23 reasons are straight, in vertical state promptly, unclamp card nut 14, the open-angle of change angle modulation bar 15 makes the nib of metal marker 25 refer to promptly adjust R on the mid point of the difference of length radius; Change the open-angle of pen clip 23 then, do not changing under the open-angle prerequisite of angle modulation bar 15, nib is referred on major semiaxis, promptly adjust r, fixing card nut 14.Pin the land 1 of center-pole 19 upper ends downwards with forefinger, refer to stir rotating turret 9 with middle finger with mother, needed ellipse can draw.

Claims

1, ellipsograph-A type belongs to a kind of instrument of drawing oval usefulness.It is characterized in that this instrument comprises a center-pole 19 that passes whole ellipsograph center and have keyway 29; Two pins are fixed by pin card 27 in its lower end, and a cushion wherein is on the center line of center-pole 19; Be with rotating turret 9 on center-pole 19, three intermeshed gear are equipped with at its middle part: gear wheel 5, and breast wheel 7, pinion 6, and the gear wheel number of teeth is one times of the pinion number of teeth; Gear wheel 5 is enclosed within on the center-pole 19, the two central lines, and it matches by key piece 3 on it and the keyway 29 on the center-pole 19, makes gear wheel 5 to slide up and down along center-pole 19, and can not rotate; Be fixed on the rotating shaft 4 on rotating turret 9 internal pinionmws 6; The power transmission shaft 16 of metal marker 25, bull stick 22, pen clip 23 are passed in the motion of rotating turret 9 internal pinionmws 6; Bull stick 22 is enclosed within 21 li of pivoted housings, and parallel with rotating shaft 4, and bull stick 22 can only rotate for 21 li at pivoted housing, and can not move axially; The universal joint 17 that connects power transmission shaft 16 and rotating shaft 4 and bull stick 22; Be fixed on the stock 10 of rotating turret 9 bottoms; For regulating the angle modulation bar 15 of oval size, the one end is fixed on the stock 10, and the other end is connected with pivoted housing 21; Four joints at power transmission shaft 16 and angle modulation bar 15 two ends, four hinge points of formation parallelogram, the card nut 14 of adjusting rotating turret 9 upper-lower positions, bar card 13.

2, ellipsograph according to claim 1, bull stick 22 has groove 30, and fixedly the screw 20 of angle modulation bar 15 inserts into the inner, and can only rotate for 21 li at pivoted housing with assurance bull stick 22, and can not move axially.

3, ellipsograph according to claim 1 and 2 is equipped with spring 12 between bar card 13 and rotating turret 9, in order to regulate metal marker 25 concentration that draws lines.