CN107901679B - Computer mathematics diagraph - Google Patents

Abstract

The invention relates to a computer mathematics graphing device, which effectively solves the problem that the existing mathematics teaching cannot standardize the drawing in the drawing process; the technical scheme includes a drawing board, and a cloth rolling groove is fixed on the rear side of the drawing board, and the cloth rolling groove A first rotating shaft is installed at the bottom of the first rotating shaft, and a first coil spring is installed at both ends of the first rotating shaft, and a rolled cloth is wound on the first rotating shaft, and the rolled cloth is connected with a rigid rope; the upper end of the drawing board is fixed with a pulley block, and the rigid rope is connected with a A straightedge; a clamping device is installed on the upper end of the cloth rolling groove; a plurality of grooves are provided on the back of the straightedge, and a first magnetic block is placed in the groove; the straightedge includes a shell, and a The rack is meshed with a first gear and a second gear, and a third rotating shaft runs through the first gear and the second gear. The upper and lower ends of the third rotating shaft are sleeved with sleeves, and the sleeve at the lower end of the third rotating shaft The lower end is connected with a slide block, and the outer side of the sleeve is fixedly set with a first pointer. The invention is convenient for teaching and drawing, and the drawing is standardized.

Description

Computer Mathematics Plotter

technical field

The invention relates to the technical field of computer mathematics teaching, in particular to a computer mathematics graphing device used in teaching.

Background technique

Computer mathematics is a subject in universities. In university mathematics teaching, in order to enable students to intuitively understand the meaning of mathematical formulas, teachers often draw mathematical formulas on the blackboard. In the existing university teaching drawing, teachers use hand-painted Freehand drawing in the form of drawing, in the process of drawing, often the drawing size is not standard, there is no drawing coordinate system, the drawing line is curved, when drawing a circle, the radius size on the ruler is accurate, but it is often drawn out The radius of the circle is different from the actual radius. It is often either too large or too small, and a complete and regular circle cannot be drawn, so that the drawn graphics do not match the formula, and the meaning of the formula cannot be well expressed.

This traditional hand-drawn drawing may cause students' misunderstanding, and the teaching effect is not good. Therefore, the present invention provides a drawing device for mathematics teaching, which can realize precise coordinate positioning, accurate size drawing, and circular drawing when drawing. beautiful.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a computer mathematical drawing device, which effectively solves the problem that the existing mathematics teaching cannot standardize drawing in the drawing process.

The invention includes a drawing board, which is characterized in that a cloth rolling groove for placing rolled cloth is fixed on the rear side of the drawing board, a first rotating shaft is installed at the bottom of the cloth rolling groove, and first coil springs are installed at both ends of the first rotating shaft , the first rotating shaft is wound with a roll cloth that can be pulled out and wound, and the two ends and the middle of the roll cloth are respectively connected with rigid ropes;

The upper end of the drawing board is fixed with three groups of pulley blocks facing up and down, and the three rigid ropes pass through the middle of the pulley blocks respectively and are detachably connected with a ruler;

A clamping device is installed on the upper end of the cloth rolling groove;

The end of the rigid rope in the middle of the rolled cloth is equipped with a first cylinder, and the first cylinder is provided with a first clamping groove, and the back of the ruler is fixed with a first clamp that matches the size and position of the first clamping groove. A tight body, the second coil spring is sheathed on the first clamping body;

The back side of the ruler is provided with a plurality of grooves, the first magnetic block is placed in the groove, and the second magnetic block corresponding to the first magnetic block is movably placed on the rear side of the drawing board;

The straightedge includes a housing with a cavity inside, the lower side of the housing is provided with an opening, the upper end of the housing is provided with a rectangular hole, and the bottom of the rectangular hole is provided with a slide rail placed on the bottom plate of the housing. At least the upper end surface of the plane is transparent, the upper end surface of the ruler is provided with a first scale, the inner upper side of the ruler is provided with a rack, there is a gap between the rack and the bottom plate of the ruler, and the rack is meshed with The first gear and the second gear, the first gear and the second gear have a third rotating shaft running through them, the upper and lower ends of the third rotating shaft are sleeved with sleeves, wherein the lower end of the third rotating shaft is connected with a The slider that slides in the slide rail, the outside of the sleeve on the first gear and the second gear are fixed with a first pointer, the first pointer is placed in the gap and points to the first scale, the first gear and the second gear A positioning groove is provided on the sleeve at the upper end, part of the teeth of the first gear and the second gear are placed outside the opening, and the third rotating shaft can move laterally in the rectangular hole.

Preferably, the upper end of the cloth rolling groove is open, and the inside is a cavity, and the outer side of the cloth rolling groove is fixed to the rear side of the drawing board via a fixing rod.

Preferably, the clamping device includes a second rotating shaft placed on both sides of the upper end of the cloth rolling groove, the upper end of the second rotating shaft is integrally connected with a clamping piece, the clamping piece is provided with teeth, and the lower end of the second rotating shaft is connected with a rocker handle.

Preferably, the two ends and the middle of the drawing board are provided with rope grooves, and the rope grooves are used to place rigid ropes, wherein the rope grooves at both ends of the drawing board are called spare grooves, and the rope grooves in the middle of the drawing board It is called the guide groove. There is an L-shaped guide plate connected to the spare groove. The distance between the guide plate and the drawing board is greater than the thickness of the ruler. The upper end of the guide groove is equipped with a flip-open pressing piece. Make sure that the rigid rope is placed in the guide groove.

Preferably, the end of the rigid rope at both ends of the rolled cloth is equipped with a second cylinder, and the second cylinder is provided with a second clamping groove, and the back of the ruler is fixed with the size and size of the second clamping groove. The second clamping body at the position, and the third coil spring is sheathed on the second clamping body.

Preferably, the upper end surface of the ruler is placed between the sleeve and the third shaft.

Preferably, the positioning groove at the upper end of the second gear is provided with an arc-shaped notch.

Preferably, the sleeve at the upper end of the first gear is provided with a scale, the scale is transparent, the upper end of the scale is provided with a second scale, one end of the scale is sleeved on the sleeve at the upper end of the first gear, and the scale is set There is a through hole, and the sleeve at the upper end of the second gear is placed in the through hole. When the first gear is rotated, the scale moves laterally with the rotation of the first gear, but the second gear does not follow the movement, and the second gear is a movable position. In the through hole, a second pointer pointing to the second scale is sheathed on the sleeve at the upper end of the second gear.

Preferably, a manual bolt is detachably connected to the sleeve at the upper end of the first gear, and the lower bottom surface of the manual bolt contacts the upper end surface of the ruler. When the manual bolt is turned, the first gear can be fixed.

Preferably, a tension pulley is installed on the rigid rope.

The invention has an ingenious structure, and as a mathematical drawing device, it is convenient for teaching drawing, drawing is standardized, and the size is accurate, it is convenient for students to understand the meaning of drawing during teaching, it is convenient for use, the size and position can be adjusted according to needs, the circle is drawn accurately, the origin can be adjusted and Make sure the radius of the circle is accurate.

Description of drawings

Fig. 1 is a schematic side view of the overall structure of the present invention.

Fig. 2 is a schematic perspective view of the drawing board of the present invention.

Fig. 3 is a schematic perspective view of the housing of the ruler of the present invention.

Fig. 4 is a schematic diagram of the detachable connection between the rigid rope and the ruler of the present invention.

Fig. 5 is a schematic diagram of meshing between the ruler internal rack and the first gear and the second gear according to the present invention.

Fig. 6 is a schematic diagram of the structure of the lateral movement of the first gear according to the present invention.

Fig. 7 is a schematic diagram of the second gear rotation and lateral movement structure of the present invention.

Fig. 8 is a schematic side view of the first gear rotation and lateral movement structure of the present invention.

Fig. 9 is a schematic diagram of the connecting structure of the first gear, the second gear and the scale in the present invention.

Detailed ways

The aforementioned and other technical contents, features and functions of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings 1 to 9 . The structural contents mentioned in the following embodiments are all based on the accompanying drawings of the description.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1, the present invention is a computer mathematics graphing device, mainly used in mathematics teaching, convenient for drawing, accurate in drawing, making it easier for students to understand, its structure includes a drawing board 1, used for drawing, on the drawing board The rear side of 1 is fixed with a cloth rolling groove 2, and the cloth rolling groove 2 is fixed on the drawing board 1, and a first rotating shaft 3 is installed at the bottom of the lower end of the cloth rolling groove 2, and a second rotating shaft 3 is installed at both ends of the first rotating shaft 3. A coil spring 4, so that the first rotating shaft 3 can be reversed and reset by itself after rotation. The first rotating shaft 3 is wound with a cloth roll 5, which can be pulled out or wound on the first rotating shaft 3. The end of the cloth roll 5 Two ends and the middle of the two ends are connected with steel rope 6 respectively, reduce elasticity as far as possible.

The upper end of the drawing board 1 is fixed with the block pulley 7 matched with the rigid rope 6, the block pulley 7 is three groups, and there can be more groups, as long as it corresponds to the quantity of the rigid rope 6, these three sections of rigid rope 6 are separated from the block pulley respectively. 7 through the middle, and then detachably connected with a laterally placed ruler 8 at the end, the ruler 8 cannot pass through the gap between the pulley blocks 7, the gap between the pulley blocks 7 is only used to pass the rigid rope 6, the ruler 8 is blocked at block pulley 7 places.

A clamping device is installed at the upper opening of the cloth roll groove 2. After the cloth roll 5 is pulled out, the cloth roll 5 at the current position needs to be clamped and fixed to prevent the cloth roll 5 from being automatically retracted.

The end of the rigid rope 6 connected in the middle of the roll cloth 5 is equipped with a first cylinder 9, and the first cylinder 9 is provided with a first clamping groove 10. The first clamping body 11 matched with the tight groove 10 is provided with a second coil spring 12 on the first clamping body 11, and the second coil spring 12 can also be installed in the first clamping groove 10, the purpose is to The first clamping body 11 can rotate in the first clamping groove 10 , and after the rotation, the first clamping body 11 can automatically return to its original position.

The back side of the ruler 8 is provided with a plurality of grooves 13, which are used to place and fix the first magnetic block 14 in the groove 13, and the rear side of the drawing board 7 is also movably placed with a second magnetic block 14 that matches the first magnetic block 14. Magnetic block 15, the second magnetic block 15 is just used in order to match with the first magnetic block 14, when not using drawing, does not need the second magnetic block 15, when needs drawing, the second magnetic block 15 and The first magnetic blocks 14 attract each other, so that the ruler 8 can be fixed on the drawing board 1 .

The inside of the ruler 8 contains a structure, which is not a simple rectangular body. The ruler includes a housing 16. The inside of the housing 16 is a cavity. For the drawing board 1, the lower side of the housing 16 is provided with an opening 17. The upper end surface of the body 16 is provided with a rectangular hole 18, and the bottom of the rectangular hole 18 is provided with a slide rail 19 placed on the bottom plate of the housing 16. The ruler 8 has six faces, wherein at least the upper end surface of the ruler 8 is transparent. Purpose The first scale 20 on the ruler 8 can be seen clearly, the first scale 20 is placed on the upper end surface of the ruler 8, or at least the position of the first scale 20 on the upper end surface of the ruler 8 is transparent , the purpose is to see the first scale 20 conveniently.

A rack 21 is installed on the inner upper side of the ruler 8, and the position of the rack 21 has a variety of positions, as long as it does not affect the display of the first scale 20, the rack 21 does not contact the base plate of the ruler 8 when it is installed, so that the teeth There is a gap between the bar 21 and the base plate of the ruler 8, the rack 21 is fixed, and the rack 21 is engaged with a movable first gear 22 and a second gear 23, and the first gear 22 and the second gear A third rotating shaft 24 is installed in the 23, and the third rotating shaft 24 follows the first gear 22 and the second gear 23 to rotate. The upper and lower ends of the third rotating shaft 24 are sleeved with sleeves 25 to ensure that the third rotating shaft 24 can be rotated, but The sleeve 25 does not follow its rotation, and the sleeve 25 at the lower end of the third rotating shaft 24 is connected with a slider 26, and the slider 26 is placed in the slide rail 19 to ensure that the rack 21 is engaged with the first gear 22 and the second gear 23. , the first gear 22 and the second gear 23 can rotate normally and complete the lateral movement, and the sleeve 25 at the lower end of the first gear 22 and the second gear 23 is also fixedly sleeved with a first pointer 27, and the first pointer 27 does not follow Rotate, the first pointer 27 is placed in the gap, and always points to the first scale 20, and a positioning groove 28 is opened above the sleeve 25 at the upper end of the first gear 22 and the second gear 23, and the positioning groove on the first gear 22 28 is mainly used to place the positioning pin of the compass in the drawing tool, as the placement of the compass positioning pin, the positioning groove 28 on the second gear 24 is used to place the paintbrush end on the compasses.

Parts of the first gear 22 and the second gear 23 are placed at the opening 17, which is convenient to control and toggle the first gear 22 and the second gear 23 by hand, so that the first gear 22 and the second gear 23 realize rotation and movement, thereby coming Change the scale required for positioning.

Embodiment 2, on the basis of Embodiment 1, the upper end of the cloth rolling groove 2 has an opening for passing the cloth rolling 5; It is fixed on the rear side of the drawing board 1 for fixing the drawing board 1.

Embodiment 3. On the basis of Embodiment 1, the clamping device includes a second rotating shaft 30 placed on both sides of the opening of the upper end of the cloth rolling groove 2. The upper end of the second rotating shaft 30 is integrally connected with a clamping piece 31. The clamping piece 31 is provided with teeth 32 for clamping the roll cloth 5, the second rotating shaft 30 lower end is connected with a handle 33, the handle 33 can be rotated so that the teeth 32 clamp the roll cloth 5, so that the roll cloth 5 cannot be pulled out or take back.

Embodiment 4, on the basis of Embodiment 1, the two ends and the middle of the drawing board 1 are provided with rope grooves, and the rope grooves are mainly used to place the rigid rope 6, so as to prevent when drawing, due to the rigid rope 6 pressing on the drawing. plate 1, so that the ruler 8 cannot be used horizontally.

In order to better distinguish the rope grooves at both ends of the drawing board 1 from the middle rope groove, the rope grooves at both ends of the drawing board 1 are referred to as spare grooves 34, and the middle rope grooves are called guide grooves 35. 34 places are rotated and installed with an L-shaped guide plate 36, which is used for guiding the ruler 8, and also prevents the ruler 8 from swinging to the outside when drawing, and also plays a role for the fixing of the ruler 8 simultaneously.

The distance between the guide plate 36 and the drawing board 1 is greater than the distance of the ruler 8, so that the ruler 8 can be properly pulled a certain distance to the outside, so as to fit on the guide plate 36, and the upper end surface of the guide groove 35 is equipped with The pressing piece 37 that can be reversed and opened, when the rigid rope 6 is placed in the guide groove 35, the pressing piece 37 is used to control the rigid rope 6 to be placed in the guide groove 35, and plays a role of guiding and fixing the rigid rope 6.

Embodiment 5, on the basis of Embodiment 1, since there is only the first cylinder 9 in the middle, the ruler 8 cannot be well placed in a horizontal state. Therefore, in order to better place the ruler 8 in a horizontal state, in The end of the rigid rope 6 at the two ends of the roll cloth 5 is equipped with a second cylinder 38, and the second cylinder 38 is provided with a second clamping groove 39, and the back of the ruler 8 also has a second clamping groove 39 that matches the second cylinder. The second clamping body 40, the second clamping body 40 is covered with a third coil spring 41, or the third coil spring 41 is placed in the second clamping groove 39, this structure is consistent with the first cylinder 9, the first The clamping groove 10, the first clamping body 11, and the second coil spring 12 have similar structures, and the purpose is to ensure that the ruler 8 is in a horizontal state.

Embodiment 6, on the basis of Embodiment 1, in order to better ensure that the joint structure of the first gear 22 and the second gear 23 can move smoothly, the sleeve 25 at the upper end of the first gear 22 and the second gear 23 is placed Outside the upper end surface of the ruler 8, the third rotating shaft 24 moves in the rectangular hole 18.

Embodiment 7, on the basis of Embodiment 1, when drawing a circular figure, due to the existence of a certain height distance, in order to avoid the size influence brought by the height distance, a positioning groove 28 on the second gear 23 is provided with Arc notch 42.

Embodiment 8, on the basis of Embodiment 1, a scale 43 is sleeved on the sleeve 25 at the upper end of the first gear 22. The purpose of the scale 43 is to always use the positioning groove 28 on the first gear 22 as the origin instead of The dimension on the ruler 8 is used as the origin, which makes it easier to determine the radius distance of the circle.

Scale 43 is also a transparent dress, and the second scale 44 is viewed from the aspect. One end of scale 43 is provided with a circular hole, which can be sleeved on the sleeve 25 at the upper end of the first gear 22, and becomes one with this sleeve 25, so that the first When the gear 22 rotates, the scale 43 does not follow the rotation, but moves with it. The scale 43 is provided with a through hole 45, and the sleeve 25 at the upper end of the second gear 23 is placed in the through hole 45, so that whether the first gear 22 is rotated or When the second gear 23, scale 43 does not follow its rotation and lateral movement.

The sleeve 25 on the second gear 23 is sheathed with a second pointer 46 , the second pointer 46 does not follow the rotation, and can always point to the second scale 44 .

Embodiment 9, on the basis of Embodiment 1, when the positioning groove 28 on the first gear 22 is selected as the circular origin used by the compass, in order to prevent its position from changing, the sleeve on the first gear 22 25 is detachably connected with a manual bolt 47, and the positioning groove 28 is fixed at the required origin position by the manual bolt 47.

Embodiment 10, on the basis of Embodiment 1, in order to make the rigid rope 6 stretch and retract on both sides of the drawing board 1 better and more conveniently, a tensioning wheel 48 is installed on the rigid rope 6 .

During specific use, pull the rigid rope 6 so that the rigid rope 6 passes through the drawing board 1, install a ruler 8 on the other side of the drawing board 1, and match the first clamping body 11 to the first clamping groove 10, the second clamping bodies 40 on both sides are also matched into the second clamping groove 39, continue to pull the ruler 8 downward, the rigid rope 6 moves in the spare groove 34 and the guide groove 35, and select a suitable position Finally, hold the two ends of the ruler 8 with both hands to ensure that the ruler 8 is in a horizontal position, and then turn the rocking handle 33 inwardly so that the teeth 32 of the clamping piece 31 on the second rotating shaft 30 clamp the roll cloth 5. The hand can let go of the ruler 8, but the ruler 8 will not be retracted.

After selecting a suitable position, the second magnetic block 15 is placed on the rear side of the drawing board 1, and the first magnetic block 14 and the second magnetic block 15 are attracted by the drawing board 1, thereby the ruler 8 is fixed on the drawing board. On the drawing board 1, it is convenient to draw a horizontal straight line on the drawing board 1.

When it is necessary to draw an inclined line, the second clamping body 40 is disassembled, and then the straightedge 8 is rotated, and the first clamping body 11 rotates in the first clamping groove 10, so that the straightedge 8 completes the inclination, thereby drawing the inclined line. draw.

After drawing the inclination, loosen the ruler 8 and remove the second magnetic block 15, the ruler 8 will automatically return to its original position under the action of the second coil spring 12, or the second clamping body 40 can be installed , because the rigid rope 6 on both sides of the drawing board 1 can not follow the rotation, the length of the rigid rope 6 is the same, therefore, three points can ensure that the ruler 8 gets back to the original horizontal position.

When it is necessary to draw a circle, the radius of the circle must be selected first, and two situations may occur when drawing a circle:

Case 1: The origin of drawing the circle is the same as the origin of drawing the graphics coordinate system;

Turn the first gear 22 by hand, the first gear 22 meshes with the rack 21, the first gear 22 rotates, the third rotating shaft 24 rotates, the sleeve 25 does not rotate, but moves with the first gear 22, and the slider 26 is sliding rail 19, so that the first gear 22 and the rack 21 can work and engage normally. The first pointer 27 always points to the first scale 20. The center of the circle of the first pointer 27 is the same as that of the sleeve 25, so the first The scale indicated by the pointer 27 is the real scale.

First, the first gear 22 is moved to the origin of the coordinate system, at this time, then the second gear 23 is moved, and the first pointer 27 on the second gear 23 points to the radial position, and the first scale 20 The size of is the size of the desired radius.

In the second case, the origin of drawing the circle is different from the origin of drawing the graphics coordinate system;

1. First, move the first gear 22, move the first gear 22 to the desired origin, the origin is different from the origin of the coordinate system, calculate the position of the coordinate system where the radius is located according to the size difference, and then move the second gear 23 At the required coordinate system, the position pointed by the first pointer 27 is not the radius dimension.

2. Turn the first gear 22 to the origin, and then turn the second gear 23. At this time, you don’t need to look at the first scale 20, but look at the second scale 44 on the scale 43. The scale 43 always follows the first gear 22 movement, therefore, no matter where the first gear 22 rotates and moves, the position of the first gear 22 is the position where the scale 43 draws a circle, and the origin of the scale 43 is always the same as the origin of the circle, and then the second The gear 23, the second scale 44 pointed by the second pointer 46 on the second gear 23 is the radius size.

When drawing specifically, place the fixed foot of the compass in the positioning groove 28 on the first gear 22, place the paintbrush on the compass in the positioning groove 28 on the second gear 23, and move the paintbrush slowly along the arc-shaped gap 42 Go to the drawing board 1 for drawing.

Although there are parts inside the ruler 8, in fact, because the size of the first scale 20 and the second scale 44 is fixed, the parts such as the first gear 22 and the second gear 23 in the ruler 8 are very Small, the thickness of the ruler 8 will not affect the drawing.

After drawing the semicircle, the compass may not be able to pass due to the ruler 8, and because the width of the ruler 8 will not be very large, so skipping over to complete the circle will not cause great defects to the circle. After opening, you only need to complete the circle slightly.

Or, after drawing the semicircle, the ruler 8 is stretched to the outside, and the second magnetic block 15 is placed on the outside of the L-shaped guide plate 36, so that the first magnetic block 14 and the second magnetic block 15 will draw the ruler 8 Be fixed on the guide plate 36 of L shape, so straightedge 8 does not contact drawing board 1, when drawing circle, only need to tilt compasses slightly, compasses drawing circle passes and can draw complete circle from straightedge 8 below.

After everything is drawn, the second magnetic block 15 is removed, the locking device is opened, and the ruler 8 is slowly released, the ruler 8 will be retracted under the action of the first coil spring 4, and finally the ruler 8 is drawn by the pulley block 7 Blocking, placed on the upper end of the drawing board 7, does not affect the attractive in appearance of drawing.

The invention has an ingenious structure, and as a mathematical drawing device, it is convenient for teaching drawing, drawing is standardized, and the size is accurate, it is convenient for students to understand the meaning of drawing during teaching, it is convenient for use, the size and position can be adjusted according to needs, the circle is drawn accurately, the origin can be adjusted and Make sure the radius of the circle is accurate.

Claims (9)

1. computer mathematics diagraph, including drawing board（1）, which is characterized in that drawing board（1）Rear side be fixed with placement batching Batching slot（2）, batching slot（2）Bottom first rotating shaft is installed（3）, first rotating shaft（3）Both ends the first wind spring is installed （4）, first rotating shaft（3）On be wound with the batching that can be pulled out and wind（5）, batching（5）Both ends and centre be connected separately with just Property rope（6）；

Drawing board（1）Upper end be fixed with three groups of pulley blocks opposing upper and lower（7）, three sections of rigidity ropes（6）Respectively from pulley blocks（7） Centre pass through and be removably connected with ruler（8）；

Batching slot（2）Upper end clamping device is installed；

Batching（5）Intermediate rigidity rope（6）End the first cylinder is installed（9）, the first cylinder（9）On offer first Clamping slot（10）, ruler（8）The back side be fixed with and the first clamping slot（10）It is mutually matched the first clamping body of size and location （11）, the first clamping body（11）On be arranged with the second wind spring（12）；

Ruler（8）The back side on offer multiple grooves（13）, groove（13）Inside it is placed with the first magnetic patch（14）, drawing board（1） Rear side activity be placed with and the first magnetic patch（14）Corresponding second magnetic patch（15）；

Ruler（8）Including the internal shell for cavity（16）, shell（16）Downside be equipped with opening（17）, shell（16 ）'s Upper surface offers rectangular opening（18）, rectangular opening（18）Lower section offer and be placed in shell（16）Sliding rail on bottom plate（19）, directly Ruler（8）All faces at least upper surface be transparence, ruler（8）Upper surface on be provided with the first scale（20）, ruler（8） Rack is installed at interior upper side（21）, rack（21）With ruler（8）Bottom plate between there are gap, racks（21）It is engaged with One gear（22）And second gear（23）, first gear（22）And second gear（23）Inside running through has third shaft（24）, the Three shafts（24）Upper and lower side be arranged with sleeve（25）, wherein third shaft（24）The sleeve of lower end（25）Lower end is connected with It can be in sliding rail（19）The sliding block of interior sliding（26）, first gear（22）And second gear（23）On sleeve（25）Outside is fixed It is arranged with the first pointer（27）, the first pointer（27）It is placed in gap and is directed toward the first scale（20）, first gear（22）With Two gears（23）The sleeve of upper end（25）On offer locating slot（28）, first gear（22）And second gear（23）Part tooth It is placed in opening（17）Outside, third shaft（24）It can be in rectangular opening（18）Inside do transverse movement, the second gear（23）On Hold locating slot（28）On offer arc notch（42）.

2. computer mathematics diagraph according to claim 1, which is characterized in that the batching slot（2）Upper end opening, Inside is cavity, batching slot（2）Outside through fixed link（29）It is fixed on drawing board（1）Rear side.

3. computer mathematics diagraph according to claim 1, which is characterized in that the clamping device includes being placed in volume Cloth slot（2）Second shaft of upper end both sides（30）, the second shaft（30）Upper end be connected with clamp clip（31）, clamp clip （31）On offer teeth（32）, the second shaft（30）Lower end is connected with rocking handle（33）.

4. computer mathematics diagraph according to claim 1, which is characterized in that the drawing board（1）Both ends and Centre offers grooving, is used for placing rigid rope in grooving（6）, wherein drawing board（1）The grooving at both ends is referred to as spareslots （34）, drawing board（1）Intermediate grooving is referred to as guide groove（35）, spareslots（34）Place is rotatably connected to L-shaped guide plate （36）, guide plate（36）With drawing board（1）The distance between be more than ruler（8）Thickness, guide groove（35）Upper surface installation There is the tabletting that opening may be reversed（37）, tabletting（37）Ensure rigidity rope（6）It is placed in guide groove（35）It is interior.

5. computer mathematics diagraph according to claim 1, which is characterized in that the batching（5）The rigidity rope at both ends （6）End the second cylinder is installed（38）, the second cylinder（38）On offer the second clamping slot（39）, ruler（8）'s The back side is fixed with and the second clamping slot（39）It is mutually matched the second clamping body of size and location（40）, the second clamping body（40）On It is arranged with third wind spring（41）.

6. computer mathematics diagraph according to claim 1, which is characterized in that the ruler（8）Upper surface set In sleeve（25）With third shaft（24）Between.

7. computer mathematics diagraph according to claim 1, which is characterized in that the first gear（22）Upper end Sleeve（25）On be arranged with scale（43）, scale（43）For transparence, scale（43）Upper end is provided with the second scale（44）, scale （43）One end be set in first gear（22）The sleeve of upper end（25）On, scale（43）On offer through-hole（45）, the second tooth Wheel（23）Upper end sleeve（25）It is placed in through-hole（45）It is interior, when rotation first gear（22）When, scale（43）Follow the first tooth Wheel（22）Rotation and transverse shifting, but second gear（23）Do not follow movement, second gear（23）It is to be movably placed in through-hole （45）It is interior, second gear（23）The sleeve of upper end（25）On be arranged be directed toward the second scale（44）The second pointer（46）.

8. computer mathematics diagraph according to claim 1, which is characterized in that the first gear（22）Upper end Sleeve（25）On be removably connected with manual bolts（47）, manual bolts（47）Bottom surface contact ruler（8）Upper surface, when Turn manual bolts（47）When, it can be by first gear（22）It is fixed.

9. computer mathematics diagraph according to claim 1, which is characterized in that the rigidity rope（6）On be equipped with Expansion tightening wheel（48）.