JPH0245002A - Method for injection-molding shoe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a method of injection molding shoes.

(Prior art) Conventionally, as shown in Japanese Patent Publication No. 25-10-83, a groove was provided around the lower periphery, an elastic body such as hard rubber was embedded in the groove, and the elastic body was covered with the last. After suspending the shoe cover and pressing the lip of the side mold 2.2 onto the elastic body from the side through the hanging portion of the shoe cover, the sole molding cavity formed at the lower side of the last is inserted. A shoe molding method is known in which a shoe sole is molded by heating and pressurizing a sole molding material introduced into a shoe sole, and at the same time, the sole is adhered to a hanging part of a shoe shoe.

When this method is used, the lip of the side mold is pressed against the elastic body embedded in the last through the hanging part of the shoe sole during sole molding, so the shoe shoe material has the same thickness. case.

A good shoe can be obtained without forming a gap between the hanging part of the shoe cover and the lip part of the side mold, and preventing the sole molding material from protruding into the lower periphery of the shoe cover. In recent years, shoe injection molding has been adopted in the production of small-lot, high-mix shoe production.As a result, expensive molds must be prepared for each product type, which increases mold costs and costs. It has become. This applies to natural leather shoes, natural leather, and synthetic resin sheets even for shoes with the same pattern design.

Since the wall thickness varies depending on the material used to make the cover, such as fabric or a composite of these materials, the mold used in the conventional shoe molding method described above is applied to the injection molding method for shoes with the same pattern design. In this case, due to the difference in wall thickness of the shank material used, when trying to press the lip part of the side mold to the elastic body buried around the bottom of the last, if the shank material is too thin, the lip part and the elastic body A gap is formed between the shoe sole and the bottom of the shoe cover when forming the sole, and if the shoe cover material is too thick, the hanging part of the shoe cover is cut off by the lip part. The drawback was that the defective rate of shoes increased significantly. Therefore, even when molding shoes with the same pattern design, it is necessary to prepare many different types of molds depending on the thickness of the shoe covering material, resulting in a significant increase in cost.

(Problems to be Solved by the Invention) The present invention aims to provide inexpensive shoes by using the same mold for multiple types of shoes with the same pattern design.

(Means for Solving Problems, Embodiments) The present invention will be described below with reference to drawings showing the state of implementation. Cover the slope 11 on the last 1
Then, the side molds 2.2, which can be slid horizontally and vertically, are slid horizontally facing each other to close them, and the last 1 with the hanging cover a suspended is lowered. The lip part 21.21 of the side mold is attached to the last slope 11
At the same time, the lip portion 21.21 is pressed from below against the upper edge of the hanging part a' of the hanging part covered by the side mold 2.2 by the rising pressure of the side mold 2.2. After
A feature is that a sole molding material is injected into a sole molding cavity 4 formed at the lower side of the last 1 by a conventional method to mold the sole, and at the same time the sole is adhered to the hanging part a' of the shoelace. The gist of the invention is an injection molding method for shoes.

In this invention, the slope 11 formed at the lower peripheral edge of the last 1 is sloped at a uniform angle over the entire circumference of the last 1 if the hanging portion a'' of the cover has a uniform thickness over its entire circumference. In addition, if the hanging part a' of the toe cover is partially thickened by a toe reinforcing piece, heel reinforcing piece, side decoration piece, etc., then Last 1 toe and heel.

By configuring the slope 11 at the side part etc. to be steeper than other parts, that is, by configuring the slope angle (α) formed by the last bottom surface 1o and the slope 11 to be large, the side mold with a constant width can be formed. 2. The gap width Ω between the lip part 21° 21 and the last slope 11.11 due to the vertical movement in 2.2 is made larger than other parts to correspond to the hanging part of the cover that is partially formed with a thick wall. Just let it happen.

In this invention, the vertical movement of the side mold 2.2 may be performed by a hydraulic mechanism or the like.

Place the side mold 2.2 on the side mold support stand 20.2.
04:, a sliding gap 201.201 is provided, and a spring 22.
If the spring 22.22 is slidably attached via the side mold 2.2, after the side mold 2.2 is closed, the last 1 with the sleeve cover a suspended thereon can be lowered onto the side mold 2.2.
This is convenient because the lip part 21.21 can be brought into pressure contact with the upper edge of the hanging part a' of the sleeve from below by the rising pressure of the side mold 2.2 due to the repulsive force.

In addition, in the drawing, 3 indicates a bottom mold.

(Operations and Effects of the Invention) As described above, the present invention provides an inclined surface 1 in which the lower peripheral edge of the last 1 on which the cover a is hung is inclined inward with respect to the bottom surface 10.
1, and a lip portion 21.21 of the side mold that is slidable in the vertical direction from below is attached to the upper edge of the hanging portion a' of the cover covered with this slope 11.
Since the pressure contact is made with the rising pressure of 2, if the shoes have the same pattern design, the lip part 21 of the side mold can be adjusted by adjusting the vertical movement of the side mold 2°2 according to the difference in the thickness of the collar a. .21 is the hanging part a' of the cover
It can be pressed against the upper edge without any gaps.

Therefore, if the shoes have the same pattern design during sole injection molding, even if the same mold is used, the sole molding material will not protrude around the bottom of the shoe cover a, resulting in inexpensive shoes. Can be provided.

[Brief explanation of the drawing]

The drawing is a sectional view of a main part showing the state of implementation of the present invention. Explanation of symbols 1o...bottom 2. Side mold 201...Sliding gap 22...Spring 4. Sole molding cavity a'...hanging part α, slope angle 1. Last 11...Slope 20...Support stand 21...Lip part 3. Bottom mold a. So, the sole of the shoe Zero gap width

Claims (1)

[Claims] A slope 1 whose lower peripheral edge is inclined inward with respect to the bottom surface 10
The slope 11 is covered with the last 1 made up of 1, and the cover a is hung thereon, and then the side molds 2.2, which can be slid horizontally and vertically, are opposed to each other and slid in the horizontal direction. is closed, the last 1 with the hanging cover a is lowered, and the lip part 21.21 of the side mold is brought into contact with the upper edge of the hanging part a' of the cover covered with the slope 11 of the last. After the lip portion 21.21 is pressed against the upper edge of the hanging portion a′ of the cover from below by the rising pressure of the side mold 2.2,
A feature is that a sole molding material is injected into the sole molding cavity 4 formed at the lower side of the last 1 by a conventional method to mold the sole, and at the same time the sole is adhered to the hanging part a' of the shoelace. Injection molding method for shoes.