JPH031136B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molded article formed by synthetic resin molding, particularly injection molding, and a method for manufacturing the same.

Synthetic resin molded parts such as gears used in clocks and timers are often assembled using automatic assembly machines. I have to keep it in order. For this purpose, conventionally, when providing parts to an automatic assembly machine, the parts were aligned using a parts feeder and then transported to the automatic assembly machine using a linear feeder. Therefore, it requires a lot of equipment other than the automatic assembly machine, which increases the overall cost, and also causes problems such as quality problems, parts precision must be high, and problems with the automatic assembly machine. had. Furthermore, the parts feeder is a source of noise and vibration, and the automatic assembly machine also has the problem of having to match the takt time of the feeding device.

The present invention has been made in view of these points, and its purpose is to be able to supply parts to an automatic assembly machine without using a parts feeder, etc., and to reduce the occurrence of quality problems during transportation. Another object of the present invention is to provide a method for manufacturing a molded article that can easily produce the above-mentioned molded article.

To explain the present invention below, the present invention specifically relates to a molded product having a joint integrally extended from a component part through a cutting part that is subjected to cutting, and connected to another molded product of the same shape by a joint. The molded product itself is characterized in that it maintains an aligned state, and the molded product is molded using a mold that has a cavity for a component part and a cavity for a simple joint. The joint invention is characterized in that the joint is placed in the joint cavity of the mold for the next cycle of molding, and the molded products are connected by the joint at the same time during molding. It is.

Detailed description will be given below based on the illustrated embodiment. FIG. 1 shows an example of a molded product 1, which includes a component portion 2 that is a gear, a pair of joints 3 extending integrally from this component portion 2, 4, and the ends of both joints 3 and 4 located in a straight line are shaped so that they can be fitted and connected to each other. FIG. 2 shows a mold 10 for molding the above-mentioned molded product 1, in which a cavity 11 for a part and a cavity 12 for a joint connected thereto are shown.
This mold has a relief groove 15 between the movable side mold plate 13 and the fixed side mold plate 14. 16
1 is a sprue runner, 17 is a slide core, 18 is a movable side mold body, 19 is a receiving plate, and 20 is an ejector pin, and a pair of ejector pin plates 2 that hold one end of this ejector toe pin 20.
1 and 21, support pins 22 and 22 whose tips project into the relief groove 15 are attached together with a positioning pin 23 fixed to the movable template 13. When molding the molded product 1 using this mold 10, the molded product 1 molded in the previous cycle is held by the positioning pin 23 and the holding pins 22, 22, and the molded product 1 is held in the relief groove 15. At the same time, the tip of one joint 4 of this molded product 1 is located within the joint cavity 12 for molding the joint 3 of the mold 10, and molding is performed in this state.
In the thus formed molded product 1, the tip of the joint 3 covers the tip of the joint 4 of the molded product 1 supported by the positioning pin 23, and the two molded products 1, 1 are connected. When repeated, a large number of molded products 1 are connected in a straight line by joints 3 and 4 as shown in FIG. They are lined up at intervals.

As the shape of the joint between the joint 3 and the joint 4, the fourth
If the tip of the joint 4 is made into a spherical shape and the tip of the joint 3 wraps around it as shown in FIG. 5, it will function as a universal joint. Figures 6 and 7
As shown in the figure, it may also be possible to bend in only one direction. It can also be made unbendable as shown in FIG. 10 to 12 show other examples of the molded product 1, respectively.

Each molded product 1 molded with a mold 10 and connected
It is preferable to wind it up as shown in FIG. 13 and then feed it to the automatic assembly machine 9 as shown in FIG. 14. When winding up, if the molded product 1 has elasticity, the joints 3 and 4 themselves will bend, so a joint shape as shown in FIG. 8 may be used, but if the molded product 1 does not have elasticity, The joints are made in a bendable form as shown in FIGS. 7 to 7.
Incidentally, the joints 3 and 4 are installed in the automatic assembly machine 9 in the first position.
5. The molded products 1 are separated by cutting from the base end indicated by 5 in FIG.

As mentioned above, in the specific invention, the molded products themselves maintain an aligned state, there is no need to use a parts feeder, etc. when feeding them to an automatic assembly machine, and the transportation equipment may be simple. There are fewer quality problems during transportation.
In the combined invention, the above-mentioned mutually connected molded products are obtained in a mutually connected state by molding with a mold, and can be easily manufactured.

[Brief explanation of drawings]

Figures 1a and b are a plan view and a cross-sectional view of a molded product according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the same molding die, and Figure 3 is a plane showing a connected state of the molded product. Figures 4a and 4b are horizontal cross-sectional views of the joints shown above,
Figures 5a and b are longitudinal sectional views of the same joint as above, Figures 6a and b are plan views of other examples of the joint, Figure c is a longitudinal sectional view of the same as above, and Figure 7a is the same as the joint. Further, a plan view of another example, Figures b and c are longitudinal cross-sectional views of the same, Figures 8a and b
9 is a plan view and a longitudinal sectional view of another example of a joint, FIGS. 9a and 9b are a plan view and a front view of a connected molded product,
Fig. 10 a, b is a plan view and side view of another example of the molded product, Fig. 11 a, b is a plan view and side view of another row of the molded product, Fig. 12 a, b is a different molded product. 13 and 14 are schematic front views showing the wound state and unwinded state of the molded product, and FIG. 15 is a front view showing the cut section. The molded product, 2 is a component, 3 and 4 are joints, 10 is a mold, 11 is a cavity for the component, and 12 is a cavity for the joint.

Claims (1)

[Scope of Claims] 1. A molded product having a joint integrally extended from a component part through a cutting section that is subjected to cutting, and characterized in that it is connected to another molded product of the same shape by the joint. molded products. 2. A joint molded in a joint cavity in a molded product molded with a mold having a cavity for a part and a cavity for a joint connected thereto,
A method for manufacturing a molded product, characterized in that the molded product is placed in a joint cavity of the mold and molded in the next cycle.