CN2318049Y - Ellipsograph - Google Patents

Abstract

The utility model relates to an ellipsograph which is designed according to the parametric equation of ellipses. The utility model is a drawing instrument which can draw the elliptical curve simply with the definite change range of a long and a short half shafts of the ellipse. The structure of the ellipsograph is composed of a hand lever, ellipsograph feet, a sleeve barrel of a fixed end, a sleeve barrel of a rotating end, a driving gear of the fixed end, a driving gear of the rotating end, a drive shaft, a short neck rotating shaft of the sleeve barrel, a support post, a positioning steel needle, a support central shaft, a support, a transverse rod and a drawing pencil. The two feet of the ellipsograph are respectively provided with the sleeve barrel of the fixed end and the sleeve barrel of the rotating end. The drive shaft is penetrated and installed on the sleeve barrel. The sleeve barrel end of the fixed end is provided with the driving gear of the fixed end, and the sleeve barrel end of the rotating end is provided with the driving gear of the rotating end. The lower part of the sleeve barrel of the fixed end is provided with the support post, and the bottom is provided with the steel needle.

Description

Ellipsograph

The utility model ellipsograph is a kind of according to the design of elliptic parameter equation, can draw out the drawing instrument of ellipse garden curve easily in the certain limit of oval length semiaxis change.

Drawing instrument does not also have special-purpose ellipsograph at present, draws the oval some method of retouching that adopts and draws, and determines length semiaxis center 2 points (focus) earlier, determines the outline line point again, and segmentation connects with compasses or curve ruler, and the ellipse of drawing is a sub-elliptical.The teacher ovally earlier determines that with two nails two elliptic focus are enclosed within rope on two focus nails in when education, on rope, draws out oval not up to standardly with drawing pen or chalk sleeve along rope tensioning rotation, can only make education signal ellipse.

The purpose of this utility model provides a kind of ellipsograph, and is novel in design unique, can be in the certain limit of ellipse long and short shaft change one finish ellipse drawing, the easy easy grasp of method for drafting, the oval standard of drawing out is drawn an oval difficult problem thereby solve.

Ellipsograph takes following scheme to realize: the ellipsograph primary structure is made of handle, ellipsograph pin, stiff end, sleeve, rotation end sleeve, stiff end travelling gear, rotation end travelling gear, power transmission shaft, the short neck rotating shaft of sleeve, pillar, location draw point, supporting central shaft, supporting bar, drawing pen.Ellipsograph handle bottom is connected with the ellipsograph both feet, be respectively arranged with the stiff end sleeve on the ellipsograph both feet, rotate the end sleeve, be connected with the ellipsograph pin by connecting pin, power transmission shaft is installed on the sleeve, the stiff end socket end is provided with a pair of stiff end travelling gear, rotates the end socket end and is provided with a pair of rotation end travelling gear, and travelling gear can adopt conical gear.The stiff end lower cartridge is equipped with pillar, pillar is sleeved in the short neck rotating shaft of sleeve, it is fixed pivot A that the pillar bottom is provided with the location draw point, can insert drawing, post top portion is provided with the stiff end driving gear, the stiff end driven gear is fixed near on the power transmission shaft of stiff end sleeve, and stiff end main drive gear and stiff end mesh from travelling gear.The driving gear that rotates the end travelling gear is sleeved near on the power transmission shaft that rotates the end sleeve, can slide on power transmission shaft, adopts the dog screw location.Rotating end sleeve lower end has the supporting central shaft, and splicing sleeve is contained in and supports the central shaft bottom, and the rotation end driven gear that rotates the end tooth wheel is arranged on the supporting upper end, is meshed with rotation end driving gear.Have cross bar hole that cross bar is housed in the supporting, cross bar one end is provided with drawing pen, is set with spring drawing pen clip c is close on the paper.Support foot is provided with a steel ball or universal wheel, contacts with paper to be rotating fulcrum B.Distance is (a+b)/2 between fixed bearing A and the rotating fulcrum B, and distance is (a-b)/2 between rotating support B and the drawing pen nib C, and wherein a is oval major semiaxis distance, and b is oval semi-minor axis distance.Rotating end tooth wheel driving gear, to be made into speed ratio with driven gear be 2: 1, and stiff end driving gear, driven gear are identical with the rotation end driven gear number of teeth, and it is 2 times of the stiff end driven gear number of teeth that the driving gear number of teeth is held in rotation.The modulus of travelling gear is identical.

Ellipsograph is according to elliptic parameter EQUATION x=acost, (t is a phase angle to the y=bsint parametric equation in the formula, a, b is oval long, semi-minor axis, (x, y is the coordinate that phase angle is positioned at oval certain 1 P of going up during for t) design, on the rotation round of center radius (a+b)/2 being the center a bit, with (a-b)/2 is that to be twice in the synchronous point of rotation track that the rotational circle rotating speed places in the other direction be that a length radius is a to radius, the formation principle of the ellipse of b, can be easily in the certain limit of ellipse long and short shaft change one draw out elliptic curve, the ellipse garden of drawing out is strict with elliptic parameter equation drawing standard ellipse, novel in design, uniqueness is drawn an oval difficult problem thereby solved.Ellipsograph can be widely used in the schoolman and make teaching aid, and large, medium and small student makes drawing instrument, and engineers and technicians, art designing decorate the designer and make drawing, engineering design drawing instrument, and this instrument design is dexterous, and volume is little, and is easy to use, can carry.

The utility model is described in further detail below with reference to accompanying drawing.

Fig. 1 is the Ellipsograph structure schematic diagram.

Hold sleeve 5, stiff end travelling gear 6,7 with reference to accompanying drawing ellipsograph primary structure by handle 1, ellipsograph pin 2, stiff end sleeve 4, rotation, rotate end travelling gear 12,14, power transmission shaft 8, the short neck rotating shaft 9 of sleeve, pillar 10, location draw point 11, supporting central shaft 15, supporting 16, cross bar 22, drawing pen 18 constitutes.Ellipsograph handle 1 bottom is connected with ellipsograph both feet 2, be respectively arranged with stiff end sleeve 4 on the both feet, rotate end sleeve 5, adopt connecting pin 3 to be hinged mutually with ellipsograph pin 2, power transmission shaft 8 is installed on sleeve 4, on 5, power transmission shaft 8 can be at sleeve 4, rotate in 5 axis holes, rotating end sleeve 5 can locate on power transmission shaft with dog screw 13 behind certain position in slidable adjustment on the power transmission shaft 8, stiff end sleeve one side is provided with a pair of stiff end travelling gear, adopt conical gear, pillar 10 is equipped with in stiff end sleeve 4 bottoms, and pillar is sleeved in the short neck rotating shaft 9 of sleeve, and the pillar bottom is provided with location draw point 11, can constitute by three steel nails, when work, insert drawing 23, promptly insert the drawing board face, be fixed pivot A, be used for fixing and draw oval center, pillar 10 tops are fixed with stiff end driving gear 7, and stiff end driven gear 6 is fixed near on the power transmission shaft 8 of stiff end sleeve 4 one ends, the stiff end driving gear 7 and stiff end driven gear 6 numbers of teeth, modulus is identical.Rotate the end travelling gear and adopt conical gear, rotate end driving gear 12 and be sleeved on the power transmission shaft 8 that rotates end sleeve 5 right sides, rotate end driving gear 12 and can on power transmission shaft 8, slide, be positioned on the power transmission shaft 8 by dog screw 24.Rotate end sleeve 5 lower ends supporting central shaft 15 is arranged, supporting 16 is sleeved on supporting central shaft 15 bottoms, rotation end driven gear 14 is arranged on supporting 16 upper ends and fixedlys connected with supporting, be meshed with rotation end driving gear 12, the number of teeth of driving end driving gear 12 is to rotate 2 times that hold driven gear 14, it is 2: 1 that driving end driven gear 14 is made into speed ratio with driving end driving gear 12, and driving end driven gear 14 is identical with driving and driven gear 7,6 numbers of teeth of stiff end, and modulus is identical.Promptly rotate the end driving gear and be the stiff end driven gear number of teeth 2 times.Support 16 cross tube holes 20 cross bar 22 is housed, cross bar in the hole, be slidingly matched can in the hole, slide adjust behind the position fixing with screw 21, cross bar one end is provided with drawing pen 18, is with spring 19 on the drawing pen, and exerting pressure gently at spring is close on the paper 23 nib c point.Support 16 bottoms and be provided with a steel ball 17 or a universal wheel, with the paper contact point be rotating fulcrum B.Distance is (a+b)/2 between fixed pivot A and the rotating fulcrum B, and the distance between rotating fulcrum B and the drawing pen nib C is (a-b)/2, and wherein a is oval major semiaxis distance, and b is oval semi-minor axis distance.

When using, ellipsograph utilize location draw point 11 to fix on paper on pillar 10, move and rotate end sleeve 5, making fixed pivot A axis and rotating fulcrum B axial line distance reach (a+b)/2 is positioned on the power transmission shaft with dog screw 13 then, then adjust between rotating fulcrum B axis and the drawing pen nib C axis once more and make it the location with screw 21 immediately apart from remaining on (a-b)/2 by the cross bar that in cross bar hole 20, moves, rotary handle 1 gently then, because the A axle is fixed, can only be that the B axle rotates around the A axle, this moment is because stiff end gear 6 and 7 engagements, driving power transmission shaft 8 rotates, power transmission shaft 8 drives and rotates 12 rotations of end driving gear, end driven gear 14 is rotated in gear 12 transmissions, because driven gear 14, supporting 16 is sleeved on the supporting central shaft, make driven gear 14, supporting 16 is the center rotation around the B axle, rotates thereby drive drawing pen nib C, under two kinds of motions are synthetic, finish major semiaxis a, the drafting of the elliptic curve of semi-minor axis b.

Claims (4)

1, a kind of ellipsograph, it is characterized in that its structure by handle, ellipsograph pin, stiff end sleeve, rotate end sleeve, stiff end travelling gear, rotate the end travelling gear, power transmission shaft, the short neck rotating shaft of sleeve, pillar, location draw point, supporting central shaft, supporting, cross bar, drawing pen constitute; Ellipsograph handle bottom is connected with the ellipsograph both feet, be respectively arranged with the stiff end sleeve on the ellipsograph both feet, rotate the end sleeve, power transmission shaft is installed on the sleeve, the stiff end socket end is provided with a pair of stiff end travelling gear, rotate the end socket end and be provided with a pair of rotation end travelling gear, the stiff end lower cartridge is equipped with pillar, the pillar bottom is provided with the location draw point, be fixed pivot A, post top portion is provided with the stiff end driving gear of travelling gear, the stiff end driven gear is fixed near on the power transmission shaft of stiff end sleeve, and the driving gear that rotates the end travelling gear is sleeved near on the power transmission shaft that rotates the end sleeve, and rotating end sleeve lower end has the supporting central shaft, splicing sleeve is contained in supporting central shaft bottom, the rotation end driven gear that rotates the end tooth wheel is arranged on the supporting upper end, and cross bar is housed in the supporting, and cross bar one end is provided with drawing pen, support foot is provided with steel ball or universal wheel, is rotating fulcrum B.

2, ellipsograph according to claim 1, it is characterized in that distance is (a+b)/2 between ellipsograph fixed pivot A and the rotating fulcrum B, distance is (a-b)/2 between rotating fulcrum B and the drawing pen nib C, and wherein a is oval major semiaxis distance, and b is oval semi-minor axis distance.

3, ellipsograph according to claim 1 is characterized in that travelling gear can adopt the taper gear.

4, ellipsograph according to claim 1, the number of teeth that it is characterized in that the driving end driving gear is to rotate 2 times that hold driven gear, it is 2: 1 that driving end driven gear and driving end driving gear are made into speed ratio, and the driving end driven gear is identical with the driving and driven gear number of teeth of stiff end, and modulus is identical.

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