The Design Of Whole Tongue Shoe -- Conversion And Take Off Principle Diagram

Positioning and taking off is the process of dealing with natural stilts.

The conversion and take off is a special way to take off, which refers to the process of pforming the midline of the front and back into a straight line.

In order to explain the problem clearly, we use the test method and the graphic method to analyze them respectively.

1. test method

In order to clearly change the essence of taking off, do an observation test: cut the VO and HO lines of the half panel, but do not cut them.

Observe one: lay half panels, cut the mouth not to open.

At this time, the state is located in the state of picking and taking off. The angle of the front and back lines of the front and back lines is overlapped in the position of VOV'.

Observation two: VO open a natural angle of the size of the angle, positioning to take off the corner is restored (expand), at this time, the state is to take time to take off state, the back of the front line down, take the corner to the OH line position, forming a counterpoint.

Observation three: expand the angle of the VO line, until the middle line of the back and back can be connected into a straight line.

At this point, the state is converted to take off state.

As the back line of the front line continues to drop, the angle between the front and back midline is 180.

At this time, there is an angle in the multi end of the middle line of the back, which is the increase of the angle is the pformation of the stilts.

The stilling angle is also pferred to the OH line position, but the take off angle is larger than that of the counterpoint.

It is not equal to pay attention to changeover and conversion.

Conversion takes seesaw angle = conversion seesaw ten natural stilts.

Through observation, we can clearly see the ins and outs of conversion.

Even better than last, spinning or cutting, it will eventually achieve this state of taking off.

2. conversion take off principle diagram

Record the state of the observation and form a schematic diagram.

The practical drawing principle diagram is the schematic diagram after taking the change of the center, as shown in figure 1-6-1.

 

As shown in the figure, the diagram is similar to the principle of the counterdrawing with larger angle.

The steps of the drawing are as follows:

(1) the position of the whole shoe tongue is connected on the half panel profile: E to Eo to 0'to H1.

(2) extend the EV line to the back midline.

(3) to determine the size of the conversion angle, first find the Ao point, then take the 0 'point as the center of the circle, and the O'Ao length as the radius. Circle A2.

Then connect AoO'A2 to get the size of the corner, which is equal to replace the angle.

(4) make the pition and take the corner to assume the position of the broken arm on the OH1 line. By taking the 0'point as the center of the circle, the O'H1 length as the radius and making the big arc, and intersecting the Ao0'A2 with the Ao0'A2, we can intercept the pformation and take the corner H1O'H2.

(5) determine the length of the front gang A2 point is the length of the conversion of the front Gang, because the length of the A2E is larger than the midline.

On the VA2 length, the length of the AoV line of the front midline is intercepted, and the A2 point is set. The length of A2E is the actual length point of the midline.

The length of A1A "2" is called the difference between the midline conversion length and the actual length, or the length difference.

(6) connect the bottom contour: now there are two points of A2 and A2, which point to connect the bottom line?

The generation of A2 points is due to the rotation and taking off. Its function is to control the size of the corner. If the bottom is connected from the A2 point, the length of the middle line is not suitable.

The origin of the A'2 point is to find the length of the original midline, the length of the midline is just right, but it will be shorter to connect the bottom.

In the design principle of "leather shoes like structure design", the use of A/2 points to connect the bottom contour lines, however, the leather material was used in the experiment, the extension was good, and the handwork was used to stretch the edges. Although the bottom tip of the front tip was short, it could be completely bent after stretching.

At present, most of them are using machine battens, without manual dexterity, and the material is often required to be lined with interlining. The extension performance is greatly reduced. Especially, the use of some artificial leather is large, and the extensibility is great. In view of this change, the 1 / 3 length difference is adopted to solve this problem.

That is to add the 1 / 3 length difference position to connect the bottom contour.

Divide the length difference of A2A2 into 3 parts, and add one of them to the bottom of A2 point to supplement the length of the bottom.

Due to the pverse stretching effect of the bends, the longitudinal direction of the material is necessarily contracted, and the amount of lengthening will be automatically eliminated.

This 1 / 3 processing method is applicable to machine pliers or handwork.

In front of the design of the tongue of the outer ear shoes, there is a backward drop method, which is another form of changeover. When finishing the bottom, it also uses a 1 / 3 length difference.

3. notes on application conversion

The three elements of taking off are the sew angle, the middle line and the bottom line.

About taking off the corner: the conversion takes a larger angle. It includes two parts: the objective natural stilts and the artificial switch.

Then the size of the pick can be processed separately. If the natural leather material has good extensibility and good stereotype, it can be taken at about 80% of the total stilt. The remaining 20% amount can be easily pulled out when it is stretched. If the material is hard, the elongation is small or the resilience is large, it is better to take ioo% when taking the stilts; when the artificial leather material is used, it takes 100%.

About the 0'point of picking Center: the closer 0' is to O, the better the reduction effect.

Some special shoes will keep the 0'point away from 0 points. In this case, the compulsory reduction should be more.

About the back midline: if we use the forward drop method, we get the A2E line. If we use the backward descending method, we get the AoEo line, and the back midline is a straight line.

Which method should be determined according to needs, the more convenient and the better, generally, there are more chances to use A2 line.

About the outline of the bottom mouth: as the bottom of the front wall becomes longer, it is better to use the "two stroke method".

For the first time, draw the front edge of the nose, compare the J and V points in the back line, and draw the front end to 1 / 3.

The second time is to trace the bottom of the segment. First, recover the half panel, find the break point (H1), then move the break point to the H2 position, hold the H2 point, do not move, rotate the bottom face of the semi panel and overlap the contour line of the front tip, and then draw the outline.

Finally, straighten the bottom contour.