CN2204725Y

CN2204725Y - Drawing instrument for involute and archimedes spiral

Info

Publication number: CN2204725Y
Application number: CN 94214195
Authority: CN
Inventors: 张少川
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-06-15
Filing date: 1994-06-15
Publication date: 1995-08-09
Anticipated expiration: 2004-06-15

Abstract

The utility model relates to a drawing instrument for an involute and an Archimedes spiral. The utility model is characterized in that a constant pitch screw thread B on a screw rod (2) and a sloping guide groove C on a guide groove (6) lead an eccentric wheel (3) to drive a guide rail (8) and a pen (10) to rotate along the line of the screw thread and simultaneously move along the direction which is vertical to a drawing. The guide groove (6) which moves vertically presses and drives guide rail (8) and the pen (10) to move on the drawing along a radial direction and in a rotating mode, which leads the sport track of the pen (10) to be a spiral line. When a virtual straight line is coincided with a fixed point, the track is an Archimedes spiral. When the virtual straight line is not coincided with the fixed point, the track can be an involute. The drawing instrument can be used for rapidly drawing a curved line.

Description

Drawing instrument for involute and archimedes spiral

The utility model belongs to a kind of drawing instrument, is to be specifically designed to the curvometer of drawing involute and spiral of Archimedes.

The method of drawing involute and spiral of Archimedes at present is normally through after calculating, on drawing, make some spots, connect these points glossily with curve ruler again, obtain an approximate curve with this, but like this curve plotting not only speed is slow but also lack usability.

Target of the present utility model provides a kind of plotter that can draw involute and spiral of Archimedes, and it is can not only render speed fast, and practical.

Structural principle of the present utility model is such: adopt the main body mechanism of being made up of screw rod (2), eccentric wheel (3), pivoted housing (4), guide groove (6), guide rail (8) and pen (10), utilize the equal pitch thread B above the screw rod (2) to make the eccentric wheel (3), pivoted housing (4) and the guide groove (6) that are fixedly linked do the rectilinear motion of vertical drawing and rotatablely moving around fixing point of parallel drawing along threaded line together.Utilize again simultaneously above the guide groove (6) inclined guide groove C and under the pressing of depression bar (13), above-mentioned rectilinear motion and rotatablely moving is converted to guide rail (8) and pen (10) moves and drive imaginary line around fixing point K rotation at drawing upper edge imaginary line G, and the screw thread B of uniform pitch and angle [alpha] are that the inclined guide groove C of definite value can guarantee to be linear functional relation (angle that displacement equals to rotate and the product of specific constant between the angle of displacement that it moves and rotation.The nib place of order pen (10) is " imaginary line G " to the hachure of heavily delivering directly of line on drawing at heart place, eccentric wheel (3) garden, making the axis of screw rod (2) and the intersection point of drawing is fixing point K), making pen (10) movement locus on drawing is the spiral-shaped curve that is rule.When imaginary line overlapped with fixing point, this movement locus was a spiral of Archimedes.And ought not overlap, specific constant equals generating circle garden Zhou Changdu divided by 360 ° of angles, and when the velocity of rotation direction that guarantees imaginary line and the tangent place of generating circle and pen (10) mobile velocity attitude on imaginary line was opposite, then to be one be that the garden heart is the involute of generating circle F radius to the imaginary line vertical range with the garden heart with the fixing point to this movement locus.When rotating the relative position of pivoted housing (4) change and eccentric wheel (3), just can adjust generating circle radius R value.When rotation guide slot (6) changed angle α value between guide rail (8) and the drawing, specific constant will change (this constant equal pitch divided by α tangent of an angle functional value again divided by 360 ° of angles) thereupon, promptly changes angle [alpha], just can change the shape of curve.

Owing to adopted above-mentioned frame for movement, make that to the utlity model has render speed fast, practical advantage, be in particular on the method for operating, its method of operating is as follows: base (1) and screw rod (2) are vertically fixed on the drawing needle point insertion drawing E of base (1), rotate the generating circle radius R value that pivoted housing (4) adjusts to be needed, tightening screw (5) is fixed together pivoted housing (4) and eccentric wheel (3), tan value according to formula angle α equals pitch divided by generating circle garden girth, calculate needed angle α value, rotation guide slot (6) make it and drawing between the angle α numerical value that equals to calculate, tighten screw (7), guide groove (6) and pivoted housing (4) are fixed together, according to one in the different threaded line of top two rotation directions of needed rotation direction selection screw rod (2), pen (10) is moved on on the generating circle, fastening nut (9) makes pen (10) be in best angle, moving and the rotation sliding sleeve (11) with hand promotes pen (10) mobile involute that needs of drawing on drawing.Rotate pivoted housing (4), make the generating circle radius R be adjusted into zero, tighten screw (5), rotation guide slot (6) is set different angle [alpha] values as required, tighten screw (7), according in the bidirectional helical line above the rotation direction different choice screw rod (2) one moves on to fixing point K place with pen (10), fastening nut (9) makes pen (10) be in best angle, rotates and presses sliding sleeve (11) with hand and make pen (10) draw required spiral of Archimedes on drawing.

Accompanying drawing 1 is an overall pattern of the present utility model.

Accompanying drawing 2 is to be in Figure 1A-A profile of drawing the involute state.

Accompanying drawing 3 is to be in Figure 1A-A profile of drawing the spiral of Archimedes state.

What showed in the accompanying drawing is embodiment of the present utility model, it is made up of main body mechanism and auxiliary body, main body mechanism comprises that the bottom has the base (1) of needle point, be fixed on that base (1) is gone up and axis normal in the screw rod (2) of drawing, the bidirectional helical B that has uniform pitch above the screw rod (2), the eccentric wheel (3) that has double wedge N is enclosed within above the screw rod (2), to make it to mesh together in the screw thread on insertion screw rod of the double wedge above it (2), being enclosed within can be around rotation of the Wai Yuan garden heart and the pivoted housing (4) of locating with screw (5) on the outer garden of eccentric wheel (3), be contained in the guide groove (6) of adjusting the tilt angle alpha value above the pivoted housing (4) with screw (7), be contained in above the guide groove (6) the phase line slideway (8) that can the inclined guide groove C above it slides, be fixed on (10) of guide rail (8) lower end with nut (9).Auxiliary body comprises the sliding sleeve (11) that can slide and rotate on screw rod (2), one end links to each other with sliding sleeve (11) movingly with pin (12), the depression bar (13) that the other end and pen (10) adopt live ball to be connected, be contained on the screw rod (2) two ends respectively with base (1) and the contacted spring of eccentric wheel (3) (14).The effect of main body mechanism is to realize target of the present utility model, promptly working as eccentric wheel (3) rotates along threaded line, drive the guide groove (6) above it, guide rail (8) and pen (10) eccentric wheel (3) when fixing point rotates also will move along threaded line downward (or upwards) with guide groove (6), (or upwards) guide groove (6) of moving will press guide rail (8) and pen (10) are made trend (or away from) eccentric wheel (3) the garden heart on drawing radial motion (promptly pen (10) moves along imaginary line) downwards, make (10) rotate simultaneously on drawing and spiral-shaped curve of radial motion formation.The effect of auxiliary body is to help the plotter action, and depression bar (13) is pressed on the pen (10), pen (10) can only be remained on the drawing move, and spring (14) then can make eccentric wheel (3) be easy to slide on screw thread.

Claims

1, a kind of plotter of drawing involute and spiral of Archimedes is characterized in that this plotter is made up of main body mechanism and auxiliary body.

2, according to described involute of claim 1 and spiral of Archimedes plotter, it is characterized in that said main body mechanism is the equal pitch thread B that utilizes above the screw rod (2), make the eccentric wheel (3) that is fixedly linked, pivoted housing (4) and guide groove (6) are made the rectilinear motion with vertical page of rotatablely moving of parallel drawing together along threaded line, simultaneously, utilize again above the guide groove (6) inclined guide groove C and under the pressing of depression bar (13), above-mentioned rectilinear motion and rotatablely moving is transformed to guide rail (8) and pen (10) moves and drive imaginary line around fixing point K rotation at drawing upper edge imaginary line G, and equal pitch thread and angle [alpha] are that the inclined guide groove of definite value has guaranteed to be linear functional relation between displacement and the rotational angle.

3,, it is characterized in that said auxiliary body utilizes depression bar (13) to be pressed on the pen (10), can only remain on the drawing pen (10) and moves according to described involute of claim 1 and spiral of Archimedes plotter.Spring (14) then helps eccentric wheel (3) to slide on screw thread.

4, according to described involute of claim 1～2 and spiral of Archimedes plotter, it is characterized in that said main body mechanism comprises that the bottom has the base (1) of needle point, be fixed on above the base (1) and have the screw rod (2) of uniform pitch bidirectional helical, have and the double wedge that meshes together of screw thread B above the screw rod (2) and the eccentric wheel (3) that can slide along this screw thread, be enclosed within and rotate above the outer garden of eccentric wheel (3) and with the pivoted housing (4) of screw (5) location, be contained in the guide groove (6) of adjusting its tilt angle alpha value above the pivoted housing (4) with screw (7), be contained in above the guide groove (6) line slideway (8) that can the inclined guide groove C above it slides, be fixed on (10) of guide rail (8) lower end with nut (9).

5, according to claim 1 and 3 described involutes and spiral of Archimedes plotter, it is characterized in that said auxiliary body comprises the sliding sleeve (11) that can slide and rotate on screw rod (2), one end links to each other with sliding sleeve (11) movingly with pin (12), the other end and the depression bar (13) that pen (10) adopts live ball to be connected are contained in screw rod (2) and go up two ends base (1) and the contacted spring of eccentric wheel (3) (14) respectively.

6,, it is characterized in that inclined guide groove C and the angle α between the drawing on the guide groove (6) can lean on screw (7) adjustment according to described involute of claim 4 and spiral of Archimedes plotter.

7,, it is characterized in that the relative position between eccentric wheel (3) and the pivoted housing (4) can be adjusted by screw (5) according to described involute of claim 4 and spiral of Archimedes plotter.