JPS647795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for manufacturing doll heads, and more particularly, to an apparatus for manufacturing doll heads by a synthetic resin rotation molding method.

(Prior art) Generally, a doll's head body is made of soft synthetic resin by rotation molding, and a neck hole is formed in the neck portion of the doll, and this neck hole is engaged with an engaging protrusion provided in the neck portion of the body. are connected together. FIG. 1 shows an example of this, in which the engagement protrusion 21 on the upper part of the body part 20 engages with the neck hole 23 of the doll's head body 22,
At this time, the engaging protrusion 21 passes through the neck hole 23. However, when the head body 22 is rotationally molded, the resin material is also applied to the opening at the inner end of the neck hole 23, so that the neck hole 23 is closed during molding. For this reason, normally, Figure 2a,
As shown in b and c, a recess 25 is formed at the tip of the neck hole forming pin 24, and during molding, the tip recess 25 is formed from the side surface of the neck hole forming pin 24 attached to the head molding die 27. By making the resin around the tip defective, the wall of the tip periphery 26 is thinned, and when the neck hole forming pin 24 is removed at the end of molding, the unnecessary resin 28 that has been wrapped around the tip recess 25 is also removed from the tip periphery 2.
A method has been adopted in which the engagement hole 23 is opened by removing the neck hole forming pin 24 from the thin wall portion of the neck hole forming pin 24. However, even with this method, about 33% of the unnecessary resin 28 that blocks the neck hole 23 remains in the head body 22 without being separated when the neck hole shaping pin 24 is removed. Therefore, as a post-molding process, it is necessary to cut off the unnecessary resin 28 from about 1/3 of the heads produced.
Moreover, when the non-separation rate of the unnecessary resin 28 is high, it is necessary to exhaust the gas generated inside the head body 22, and for this purpose, a gas vent hole 2 is provided at the top of the head body 22.
However, in the case of rotation molding, the inner periphery of the gas vent hole 29 becomes thick, and hair is implanted into the head body 22 using a sewing machine or the like. Because
The gas vent hole 29 and the thick walled portion 30 inside the gas vent hole 29 get in the way of the hair-planting operation, and must be avoided during the hair-planting process, which has the disadvantage of making the operation complicated and troublesome.

(Objective of the Invention) The present invention solves the above-mentioned drawbacks, and in particular, separates the neck hole blockage of the head body with extremely high efficiency, eliminates post-processing after molding and gas vent holes, and facilitates production of flocking work. The purpose of the present invention is to propose a doll head manufacturing device that can improve the efficiency and efficiency of hair transplantation work.

(Means for Achieving the Object) In order to achieve the above object, the apparatus for manufacturing a doll head body according to the present invention protrudes a pin for forming a doll neck hole into the inside of a molding die for molding a doll head body. After injecting the required amount of sol-like synthetic resin material into the inside of the mold, the mold is rotated to inject the synthetic resin material along the mold and the inner surface of the neck hole molding pin. In a doll head manufacturing apparatus that molds a doll head by flowing and layering the doll,
The neck hole shaping pin is characterized in that an outwardly directed obstructing protrusion is provided near the tip of the circumferential side of the neck hole shaping pin, and further, the tip peripheral edge of the neck hole shaping pin is formed into a sharp point.

(Example) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, 1 is a mold for forming a doll's head body. Inside the mold 1, there is a head body 2 for the doll to be obtained.
A concave surface 3 corresponding to the outer shape of is formed, and a fitting hole 5 for a neck hole forming pin 4 is provided in the lower part. This neck hole forming pin 4, like the conventional one, has an annular groove 7 around the circumferential side of the approximately central part of the cylindrical pin main body 6, and a recess 10 is formed on the tip side thereof. However, in addition to this, an annular obstacle protrusion 8 is provided around the vicinity of the tip. moreover,
The distal end peripheral portion 9 is formed into a tip.

Therefore, a method for manufacturing a doll head using the neck hole forming pin 4 will be described.

First, a necessary amount of a sol-like soft synthetic resin material 12 (hereinafter simply referred to as sol-like resin material 12) such as soft vinyl chloride is injected as a molding material into the mold 1 of the doll's head body 2, and the above-mentioned A neck hole molding pin 4 protrudes from the lower part of the mold 1, and its outer surface is configured as an adhesion surface for molding material.

Next, as in the usual manner, rotation molding is performed while rotating the molding die 1 under heating. Due to the centrifugal force that acts during rotation, the sol resin material 12 in the mold 1 flows along the inner surface of the mold 1,
Shape the eyes, mouth, nose, head, etc. Similarly, the sol-like resin material 12 also spreads over the outer surface of the neck hole forming pin. At this time, the sol-like resin material 12 gradually spreads from the base of the pin body 6 to the tip.

That is, in the rotation molding, the sol-like resin material 12 in the mold 1 is caused to flow by centrifugal force when the head mold 1 is rotated. Rotation conditions are set so that the centrifugal force during rotation is large for the inner surface of the mold 1 and the surfaces radially formed from the center of the mold 1. The sol-like resin material circulates well in areas where the centrifugal force is large. On the other hand, conversely, sol-like resin material is applied to areas where centrifugal force does not act or where centrifugal force acts little.
2 is difficult to turn.

Looking at this with respect to the head mold 1 and neck hole molding pin, the centrifugal force based on the rotation of the mold 1 acts strongly on the internal concave surface 3 of the head mold 1, so the sol The shaped resin material 12 spreads outward along the inner concave surface 3. Similarly, since the pin body 6 of the neck hole molding pin is provided in a radial direction from the center of the molding die 1, the sol The shaped resin material 12 advances from the base to the tip along the outer surface of the neck hole shaping pin 4, and then passes through the neck hole shaping pin 4.
adheres to the outer surface of the At this time, the sol-like resin material 12
first enters the annular groove 7 formed approximately in the center from the peripheral surface of the base of the pin body 6, fills the groove 7, and further advances toward the tip side of the pin body 6. However, an obstacle protrusion 8 is provided in front of the tip, and the sol-like resin material 12 has to climb over the obstacle protrusion 8 before reaching the tip. Since it is formed to protrude outward from the main body 6, it is difficult for the sol-like resin material 12 to cross over it. This is because the inner and outer wall surfaces 8a and 8b of the obstacle protrusion 8
This is because they are formed to protrude outward from the outer surface of the pin body 6, and the inner and outer wall surfaces 8a and 8b are not formed radially from the center of the molding die 1. Therefore, the centrifugal force accompanying the rotation of the molding die 1 is difficult to apply to the obstructing protrusion 8, especially the inner and outer wall surfaces 8a and 8b, and the sol-like resin material 12 is difficult to spread around. Therefore, the sol-like resin material 1 is attached to the obstacle protrusion 8.
2, the thickness of the sol-like resin material 12 near the tip of the neck hole forming pin 4 becomes very thin, and since the tip periphery 9 is formed into a sharp point, it becomes extremely thin. becomes. The sol-like resin material accumulates on the last tip recess 10 (the sol-like resin material in this state is indicated by 13).

The progress of the sol-like resin material 12 with respect to the neck hole-forming pin 4 will be explained with reference to FIG. 4. In the first stage of molding, as shown by the line 4, and then enters the annular groove 7 as shown by line q, and further advances along the outer wall surface 8b of the obstacle protrusion 8 as shown by line r. At this time, as mentioned above, the resin does not flow well, so the wall thickness becomes thin.
Similarly, when the sol-like resin material 12 advances toward the pin body 6 side along the inner wall surface 8a of the obstruction protrusion 8 as shown by the line s, the surroundings of the resin material are not good. Therefore,
The sol-like resin material 12 is in an extremely thin state, and finally the line t
As shown in FIG.
The sol-like resin material rarely adheres to the
Therefore, the tip peripheral edge 9 becomes even thinner.

Next, after the rotation molding is completed, the neck hole molding pin 4 is removed from the mold 1. This results in
The doll's head body 2 is molded by the sol-like resin material 12 layered in the mold 1, and the neck hole and An engagement hole 23 is molded.

By the way, the thick part of the sol resin material 12 layered on the outer surface of the neck hole molding pin 4, that is, the part layered on the circumferential surface of the pin body 6, is inside the doll head body 2. However, since the wall thickness of the tip peripheral edge 9 of the neck hole forming pin 4 is extremely thin, the sol-like resin material 13 on the tip recess 10 is
When the pin is removed, it separates from the ultra-thin wall portion and is easily removed from the doll head body 2 together with the neck hole forming pin 4. Therefore, the neck hole formed by the above-mentioned molding is not closed in any way and is formed through the neck hole. Moreover, according to the above molding, the unnecessary resin material 1 attached to the tip of the neck hole molding pin 4
The removal rate of No. 3 is actually about 95% or more, and the unnecessary resin material 13 can be almost completely removed.
Therefore, unlike the conventional method, post-processing for removing the blocked portion of the neck hole is almost unnecessary. Further, since there is no need to carry out a degassing process to remove the residual gas, a degassing hole at the top of the head body 2 is not required. Therefore, hair transplantation becomes easier, work efficiency is significantly improved, and the appearance is also excellent.

Note that the shape of the obstruction protrusion 8 provided on the neck hole forming pin 4 is not necessarily limited to that shown in the above figure. For example, as shown in FIG. 5a, the obstacle protrusions 8 are formed on the circumferential surface of the pin body 6 at regular intervals, and as shown in FIG. One in which the inner and outer wall surfaces 8a and 8b of the obstacle protrusion 8 have different protruding widths as shown in c or d of the same figure, and one in which a plurality of obstacle protrusions 8 are provided as in the figure e.
They may each be formed diagonally, etc. Furthermore, the inner shape of the neck hole can be appropriately set depending on the manner of connection with the body of the doll, and the shape of the neck hole molding pin 4 can be set according to this manner of connection. When the body 2 and the neck hole are to be of a screw-in type rather than a press-fit type as shown in the example shown above, a thread groove 14 must be formed in the neck hole forming pin 4 as shown in FIG. Bye.

(Effects of the Invention) As described in detail above, according to the present invention, an obstructive protrusion is formed near the tip of the neck hole forming pin to which the centrifugal force in rotation forming is difficult to act. The sol-form synthetic resin material for molding is obstructed by the above-mentioned obstructive protrusion, and its flow to the tip of the neck-hole forming pin is obstructed, and even if the synthetic resin material crosses the above-mentioned obstructive protrusion, the above-mentioned neck-hole forming pin Since the peripheral edge of the tip is formed into a point, the thickness of the synthetic resin material layered on this portion is extremely thin. Therefore, after molding is completed, when the neck hole shaping pin is removed, the resin layer layered at the tip of the neck hole shaping pin does not remain inside the head body and can be easily removed together with the neck hole shaping pin. It is separated from other thick parts and removed outside the head body. This eliminates the need for post-processing to remove unnecessary residual resin flesh and venting holes for residual gas in the head body, which significantly improves the productivity of the head body itself, as well as hair transplantation work. It is also possible to significantly improve efficiency.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the doll's head in a connected state with the body, and Fig. 2 a, b, and c are respectively an overall view of a conventional molding die for a doll's head and a perspective view of a pin for forming a neck hole. Figure and enlarged view of the neck, Figure 3 a, b
and c are respectively an overall view of a mold for forming a doll's head body according to the present invention, a perspective view of a pin for forming a neck hole, and an enlarged view of the neck portion, and FIG. An enlarged view showing how the resin material is attached,
Figures 5a, b, c, d and e are side views showing other examples of the obstruction protrusion of the neck hole forming pin according to the present invention, and Figure 6 is a side view of another example of the neck hole forming pin. FIG. Code 1...Molding mold, 2...Doll head body, 3...
... Concave surface, 4 ... Pin for neck hole molding, 5 ... Fitting hole,
6...Pin body, 8...Obstruction protrusion, 9...Tip periphery, 10...Tip recess, 12, 13...Sol-like resin material.

Claims (1)

[Scope of Claims] 1. A doll neck hole molding pin is provided protruding inside a mold for molding a doll's head body, and a required amount of sol-like synthetic resin material is injected into the mold. After that, the above-mentioned molding die is rotated, and the above-mentioned synthetic resin material is made to flow and form a layer along the inner surface of the molding die and neck hole forming pin, thereby forming a doll head body.Manufacturing a doll head body. In the device, the neck hole shaping pin is provided with an outwardly directed obstruction protrusion near the tip of the circumferential side thereof, and further, the neck hole shaping pin has a tip peripheral edge formed into a sharp point. Head body manufacturing equipment.