CN87214759U

CN87214759U - Multifunction curve drawing instrument

Info

Publication number: CN87214759U
Application number: CN 87214759
Authority: CN
Inventors: 李利君
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-10-26
Filing date: 1987-10-26
Publication date: 1988-08-31

Abstract

The utility model relates to a multifunctional curve drawing instrument which is composed of a center wheel, a rotating arm, a pen wheel, a proper positive motion device, a transmission gear and a driving gear. Compared with the prior art, the multifunctional curve drawing instrument can be used for drawing unclosed curves; a simple, practical and accurate tool is provided for drawing the common unclosed curves, such as involute, sinusoid, etc. for the teaching and engineering.

Description

Multifunction curve drawing instrument

The application is a kind of product, and it belongs to drawing instrument.The multi-functional plane curve that " Machine Design " magazine (western Beijing Polytechnical University) the 4th phase of nineteen eighty-three discloses is drawn mechanism, by positive motion device (center hinge of location), centre wheel, transmission device (third wheel), pen wheel (planetary gear), pivoted arm (wheel carrier) and drive unit (be contained on the wheel shaft, be used for driving the device of drawing pen) are formed.Its energy draw circles, multiple closed curves such as ellipse, cycloid.Yet can not draw non-closed curve, as curves such as the involute that often will use on the engineering, in the teaching, helical, sines.

The application's purpose is to overcome existing above-mentioned difficulties in the prior art and a kind of multi-functional curve plotter that can paint non-closed curve is provided.

The task that the application proposed is that following two schemes are finished: the first constitutes drive unit with base, driven wheel and the tooth bar that has a drawing pen on the prior art basis, it can paint non-closed curves such as involute, helical; It two is on the prior art basis, constitute the positive motion device with rolling bearing, tooth bar guide rail and slide block, and the selection appropriate driving device, as T type pen, sinusoidal drive device, tangent drive unit, just can draw non-closed curves such as roulette, sine curve, tangent cutve.

Following the application will be described in detail in conjunction with the accompanying drawings.

Fig. 1 is a locating rack positive motion device plotter structure.

Fig. 2 is a rack-and-pinion positive motion device plotter structure.

Fig. 3 is the sinusoidal drive device.

Fig. 4 is the tangent drive unit.

Fig. 5 is a pulley rope belt driver plotter structure.

At the task that the application proposed, first solution is: as the positive motion device, drive unit then is made up of base 2, driven wheel 3 and the tooth bar 5 that has a drawing pen hole 4 with locating rack 1.By centre wheel 6, the rotation of pivoted arm 7 is passed to pen wheel 8 by transmission device, the drive unit that is installed on the wheel shaft 9 drives drawing pen 10, draws non-closed curves such as involute.Transmission device can be the third wheel that is meshed with centre wheel, pen wheel as of the prior art, it also can be toggle formula transmission arm as shown in fig. 1, by mutually hinged arm 11,12, one group of intermeshed

gear

13,14,15,16,17,18,19,20,21,22 compositions of change-speed gearing, this is called gears engaged toggle formula transmission arm.If on pivot 23, arm 11,12 hinged places, wheel shaft 24, respectively adorn a pulley, and on pulley, adorn synchronous cog belt, and original intermeshed gear is taken away, can reach the purpose of transmission equally, it is called synchronous cog belt toggle formula transmission arm.Change the gear ratio of change-speed gearing, just can change the resultant gear ratio size, thereby draw different curves, for reaching the commutation purpose, toggle formula transmission arm requires centre wheel to have two 25,6.When

pivot

23 or 26 is positioned frame 1 usefulness screw 27 fixedly the time,

wheel

6 or 25 is just made centre wheel and is used.

Pivot

23,26 is installed in the slideway of pivoted arm 7 by

slide block

28,29, and can change position R ₁, fastening

nut

30 or 31 just can be fixed on

pivot

23 or 26 on the pivoted arm 7.Driven wheel 3 intermeshes with tooth bar 5.5 of tooth bars are contained in the slideway of base 2, and there is the hole 4 that drawing pen is installed its end.Whole base is fixed on the pivoted arm by a wheel shaft 9, securing

member

32,33.

Second solution is: pivoted arm, centre wheel, transmission device, pen are taken turns all identical with the first string.The positive motion device then is made up of the slide block 36 of rolling bearing 34, the tooth bar guide rail 35 of being with slideway 38, band square hole and trip bolt 37.Rolling bearing 34 is contained on

pivot

23 or 26, and pivoted arm 7 is inserted in the square hole of slide block 36, and is fixing with screw 37, makes the tooth bar engagement on gear 34 and the guide rail 35.Moving slider 36 on slideway 38, by rolling bearing 34, and by transmission device, pen wheel, by appropriate driving device, just can draw non-closed curves such as roulette.

The application provides three kinds of appropriate driving device, is respectively T type pen, sinusoidal drive device, tangent drive unit.

So-called T type pen as shown in Figure 2, is the cross bar 40 that finger ends has pen 39, utilizes the nut 32 on the wheel shaft 9, can adjust the position R of crossbar end easily ₂

The sinusoidal drive device, be made up of the crank disc 46 of the base 43 of

tape guide pin

41,42, cross 44, band pin 45,

guide finger

41,42 is enclosed within the groove of cross 44 in an end band hole 47, play the guiding role, and pin 45 is enclosed within another groove of cross 44.

The tangent drive unit, then base 49, the band by band alignment pin 48,60 contains the T type frame 52 of the slide block 51 of fixator pins 50, the rotating guide-bar 53 of trough of belt is formed.Fixator pins 50 is enclosed within the groove of rotating guide-bar 53, and drawing pen just is contained on the slide block 51, during drawing, need compress alignment pin 48,60, makes T type frame 52 fixing with base 49.

When making instruments used for education, all can simplify the transmission device of above-mentioned two schemes.As shown in Figure 5, transmission device is by tension pulley block 54, and follow-up pulley 57 and transmission strap 58 are formed.And correspondingly centre wheel makes pulley 55,56 into.

Claims

1, a kind of multi-functional curve plotter is made up of locating rack 1, centre wheel 6, pivoted arm 7, transmission device, 8 on pen wheel, it is characterized in that drive unit is made up of base 2, driven wheel 3 and the tooth bar 5 that has a drawing pen hole 4.

2, a kind of multi-functional curve plotter, formed by centre wheel 25, pivoted arm 7, transmission device, pen wheel 8 and drive unit, be it is characterized in that the positive motion device is made up of the slide block 36 of tooth bar guide rail 35, band square hole and the trip bolt 37 of rolling bearing 34, band slideway 38.

3, a kind of by the described plotter of claim 2, it is characterized in that said drive unit is a T type pen.

4, a kind of by the described plotter of claim 2, it is characterized in that said drive unit is made up of base 43, cross 44, crank disc 46.

5, a kind of by the described plotter of claim 2, it is characterized in that said drive unit is made up of base 49, T type frame 52, rotating guide-bar 53.

6, a kind of claim 1 or 2 or 3 or 4 or 5 described plotters pressed is characterized in that having two centre wheels 25,6, and transmission device then is the bent up-to-date style transmission arm of gears engaged or synchronous cog belt.

7, a kind of claim 1 or 2 or 3 or 4 or 5 described plotters pressed is characterized in that having two center pulleys 55,56, and transmission device then is made up of tension pulley block 54, follow-up pulley 57 and transmission strap 58.