Common Design Points And Control Lines On The Last Surface

It is necessary to prevent the shoes from falling down when they wear shoes.

The basic structure of the rear band sandals includes front tripping, back tripping, girth, front crossover and back crossover.

There are 2 commonly used control points, one is the E point and the other is the q.

But there are differences between the QQ and E points on sandals and the application of full shoes.

Application of 1.Q point

When designing sandals, the position of QQ will change like that of women's shallow shoes.

The general Q point is determined by overtaking CQ from 4 to 5mm.

C points account for 21.66% of the foot length.

When the back pack is used for the rear package and parts, it is not easy to change the shape, generally take CQ=4 to 5mm.

When the back arm is a rear tripping structure, the shoelace is directly linked to the front side, and there will be a change in the shape of the shoe. 5mm should be added above the q.

When the back Gang is an independent back bar, it is easy to change the shape of the shoe, and increase 8mm on the q.

When the rear band is used for the front or rear crossover, the lOmm should be added above the QQ point, considering the smooth surround with the ankle.

In the design of women's shallow sandals, QQ exercises have been done for reference.

Application of 2.E point

When E points are taken, the VE point must be determined by measuring the length of the E point. First, we must find the V point and measure the 68.8% of the foot length from the C point.

The VE length of men's and women's sandals is 27% feet long.

Male 250 last VE= (67.5 + 1.35) mm, female 230 last VE= (62.1 + 1.35) mm.

When applying E points, we need to make reference to the following requirements.

If the belt is designed, the length of the belt should not exceed E.

If the front belt is designed to be relatively thin, it should be designed at E point, and the appropriate position of the binding foot can be found by using the free adjustment of the pverse band.

If the shoelace is wider, it will be designed before the E point.

If you design the girth and the front and rear crossover, ensure that the net size of the belt is not less than 50% of the foot length, and the 230 is 115mm.

In the design of the shoe last, this is the dimension data that must be considered. Some of the last type is not standard. If the size is not up to the requirement, the design size of the girth should be adjusted.

The length of the girth can be adjusted without causing trouble.

3. the control line of the front gang.

The design position of the front Gang is determined through the last bottom control point.

Use the tape ruler to connect the A1 points and the A2 points on the last surface, and get the front line of control a1az line; and B1 points and 6.

The points are connected on the last surface, get the B1 B2 line of the small toe end control line, connect the C1 points and the C2 points on the last surface, get the Cl C2 line of the metatarsophalangeal control line, connect the D1 point and D2 point on the last surface, and get the waist line control line D1D2 line; connect the E point and the G-point respectively, and get the control line.

Take the middle point of the C1C2 line as 0 points, connect the OQ line and get the back height control line, see figure 4-4-3.

As shown in the figure, 5 upper surface control lines can be obtained by fastening the last surface with a tape ruler to connect 5 sets of control points.

The back control line should be connected two times through E points.

Position the O point of the midpoint of the metatarsophalangeal control line and connect the OQ line to get the height control line.

In figure 4-3-1, we have already introduced the preparation of the half panel of the hollow sandals. The half panel of all air sandals is also made with the method of sticking the last to take long stilts. Then the design points of the sandals are marked on the half panel, as shown in figure 4-4-4.

As shown in the figure, the design points on the bottom of the half panel can be marked by the design points on the bottom board. It is a "dislocation" on the outer half of the panel and can be used to make the model inside and outside.

The point on the back line of the front support is a sign, not a fixed point. It changes with the parts. It can be obtained through the vertical line of the midline in the bottom point.

The OQ line is also connected as the height control line.

It can be clearly seen in the graph that several control lines divide the last surface into 5 areas, of which the front part is made up of 1~4 blocks, and the latter is often used for 4~5 blocks.

As a result, the design of sandals components can be pformed into the choice of the front area and the coordination of the rear structure.

The dividing line of the 5 areas is not the dividing line of the parts, but also the control line of the general position.

Next, take the area of "1+2+3+4" as an example for analysis, see figure 4-4-5.

As shown in figure (a), it is a common thick heavy sandal with 4 blocks for the front.

Although the side surface structure is simple, there is a bending phenomenon in the midline, and the parts need to be converted and handled.

Figure (b) is a variant design of (a). Although it uses 4 areas, it has made horizontal segmentation, which makes the upper shoe lighter and saves the trouble of taking off.

Figure (c) is another variant design of (a). Although it also uses 4 areas, it has made horizontal segmentation to make the upper shoe lively.

The cover parts need to be taken off.

Figure (d) is also a variant design of (a). It also uses 4 blocks, but combines the characteristics of horizontal segmentation and vertical segmentation. It forms a combination of belt and strip and becomes another sandal.

Let's look at the next group of changes using the "1+2" area, see 4-4-6.

As shown in Fig. (a), using the area of "1+2" directly as a front part is a simple component.

If the area of "1-1-2" is unchanged, the bar segmentation of graph (b) will not be dull.

If C looks like a cross structure, it will be more lively.

If D becomes an overlapping structure, there will be another vivid result.

The pverse division, vertical division, cross combination and overlapping combination of such analogies are only a means of change.

The design of the front parts of sandals, first choose the area occupied, that is, determine the location of the parts, then make a combination of decomposition and modeling changes, coupled with the matching of different teams, will form a variety of shoes.

4. toe exposure

The toes of all air sandals must be exposed, and the number of exposed toes is sometimes a design requirement.

The number of toes exposed can be analyzed through the control line on the last bottom template, as shown in figure 4-4-7.

As shown in the picture, the ends of the toes are on the A1 line, then the ALA2 line is used to design the front openings to reveal 2.5 toes.

The end point of the little toe is on the width line at A3 point, then use the b1b2 line to design the front opening to reveal 4.5 toes.

If you want to design other exposed toes, you can make 3 equal width parallel lines between the ALA2 line and the b1b2 line, which are the design positions showing 3 toes, 3.5 toes and 4 toes respectively.

If you want to reveal 2 or 5 toes, you can make an equal distance parallel line between the first and second control lines.

The design of the sandals and the application of the control line are flexible. Because of the large change in the shape of the parts, no constraint on the points and lines, but with the control of the points and lines, the general orientation of the components is clear, which can shorten the time spent and improve the quality of the design.