JPS6142616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding apparatus, and more particularly to a continuous automatic molding apparatus that sequentially inserts parts of a long material into predetermined positions, performs runnerless molding of plastic, and wraps the plastic.

In electronic parts and component parts of electronic parts, etc.
Means for processing a long material such as a hoop material as required to form a plurality of inserts connected, and forming an insulating layer, a package, etc. with plastic molding so as to cover all of the inserts or to partially lead out the inserts. This method is widely used because it is suitable for mass production. However, in conventional insert molding, a large number of inserts connected and formed in a hoop material were cut into individual pieces or a small number of groups, and then manually molded. Therefore, in order to send the molded products to post-processes (assembly, stamping, etc.), it not only takes manpower to line them up in a predetermined box, but also makes it difficult or inefficient to automate the post-processes. It was becoming. Also,
Molded molds generally require eject means to separate the molded product from the cavity, and
In order to connect and form a large number of molded products on a long material, a means for positioning the long material in the width direction near the cavity of the mold is required, and a mold is provided with such a mold release means and a positioning means, respectively. When trying to construct a molded article, there was a problem that congestion occurred near the cavity, especially when the molded article was relatively small.

An object of the present invention is to eliminate the above-mentioned drawbacks, save labor, and facilitate the automation of the post-process. A molding machine,
The forming machine includes a second autoreel that winds the long material that has been insert-molded in a predetermined manner, and the forming machine includes a runnerless mold for forming the mold, and a delivery port for the long material. The movable side mold of the mold includes a gripper that can be clamped on the outside, a long material end detector provided outside the introduction port for the long material, and means for feeding the long material by a predetermined amount. The fixed side template of the mold, which is provided with a runnerless nozzle facing above the plate, is biased by a compression coil spring and can move up and down, and the long material is moved a certain distance away from the fixed side template. This is achieved by providing a continuous automatic molding device characterized in that a guide is provided to guide the object in position, and the biasing force of the coil spring acts to separate the molded product at the tip of the nozzle.

The present invention will be explained below using the drawings.

FIG. 1 is a plan view of a terminal board for a mechanical switch manufactured by our company that is connected and molded using a continuous automatic molding apparatus (FIG. 2) according to an embodiment of the present invention. In the figure, the terminal board 1 includes a contact spring set 3 having a plurality of contacts 2, and the contact spring set 3 is insert-molded so that the contacts 2 are exposed and the surrounding area is buried, and a plurality of lead terminals 4 are led out. It is composed of an insulator 5. However, a large number of contact spring sets 3 are manufactured by press processing from a hoop material having spring properties, and the insulator 5 is connected to the connected contact spring sets 3.
is inserted into a predetermined position, and then formed using a runnerless mold. Further, 6 in the figure is a feed hole.

After stacking and fixing necessary parts such as a dome-shaped disc spring (not shown), insulating tape (not shown), and an actuator (not shown) to the terminal board 1, a predetermined portion of the contact spring assembly 3 is cut. to complete the mechanical switch.

FIG. 2 is a front view of the overall configuration of an automatic molding device that continuously molds the terminal board 1 shown in FIG. 1 as an embodiment of the present invention, and FIG. 3 is a perspective view of the molding device on the exit side of the molding machine. It is.

In FIGS. 2 and 3, the continuous automatic molding device 11 includes an autoreel 13 equipped with a feed material (hoop material) detector 12, a feed material (hoop material) end detector 14, and a runnerless molding tool. It is composed of a plastic mold forming machine 18 equipped with a mold 15, an air gripper 16, a hoop material feeding mechanism 17, and an autoreel 20 equipped with a winding detector 19.

The hoop material 21 that has been pressed into a predetermined shape and wound around the autoreel 18 is introduced into the molding machine 18 by passing over the feed material detector 12 and the feed material end detector 14, and a large number of insulators 5 are successively molded. After being formed, it passes through an air gripper 16 and a winding detector 19 and is wound onto an autoreel 20. In addition,
The runnerless mold 15 includes a fixed side mold plate 15a facing above a movable side mold plate 15b that can move up and down and equipped with a runnerless nozzle, and when the fixed side mold plate 15a and the movable side mold plate 15b are in contact with each other, , a cavity necessary for molding the insulator 5 is constructed.

In the forming apparatus 11 having such a configuration, when the hoop material 21 is fed by a predetermined amount in the direction of the arrow A by engaging the pin (not shown) of the feeding mechanism 17 with the feeding hole 6 (FIG. 1), the hoop material 21 is heated by pressurized air. Gripper 16 in action
clips the hoop material 21. At the same time, the movable mold plate 15b starts to rise and stops when it comes into contact with the fixed mold plate 15a, and a certain amount of plastic melted by the heating cylinder 22 of the molding machine 18 is injected into the cavity and forms one insulator 5. is formed. Next, the movable template 15b descends, and when the hoop material 21 that crosses the molding machine 18 is in a direct state as shown in FIG. 21 is again sent in the direction of arrow A by a predetermined amount. By repeating the above operations, a large number of insulators 5 are successively formed on the hoop material 21.

However, the material supply detector 12 and the winding detector 19
In order to supply and wind the hoop material 21 to the forming machine 18 without applying unnecessary tension, the autoreels 13 and 20 are rotated appropriately, as seen in ordinary continuous press processing equipment. Detect information that causes Then, the feeding material end detector 14 electrically detects whether or not there is a part of the hoop material 21 thereon, and if it detects that there is no hoop material 21, then after a certain period of time after issuing an alarm, Molding machine 18
to stop.

In addition, in FIG. 3, 23 is the main body of the molding machine 18, 24 is a column supporting the heating cylinder 22, and 25 is a fixed side mounting plate of the mold 15.

FIG. 4 is a side view with a part of the runnerless mold 15 installed in the mold forming machine 18 in cross section. However, the same reference numerals are used for the same parts as in the previous figure.

In FIG. 4, the runnerless mold die 15 includes a fixed side template 15a and a manifold 26.
and a fixed side that has a pair of hoop material guides 27 and the like and is attached to the mounting plate 25, and a movable side that has a movable side template 15b facing the fixed side template 15a and can move up and down. configured. The fixed side mold plate 15a having a mold forming part 15a' at the center of the lower surface is attached to the back plate 2.
8 and a cylindrical spacer block 29 to the fixed side mounting plate 25. On the other hand, the substantially conical manifold nozzle 30 is attached to the heating cylinder 22 via the manifold 26 with the band heater 31 attached to the outside and the nozzle bush 32, and is fitted into the back plate 28 and connected to the manifold 26 and the stationary template 15a. A manifold cavity 34 is formed by the clamped cylindrical collar 33 and the conical hole of the stationary template 15a. That is, the thermoplastic plastic 35 melted by the heating cylinder 22 is heated to the nozzle bush 32 and the manifold 26.
It passes through a small hole (runner) penetrating the center of the manifold nozzle 30 and is supplied to the mold forming part 15a' of the stationary template 15a, but also fills the manifold cavity 34. Therefore, the manifold nozzle 30 is heated by the band heater 31 via the manifold 26, and is insulated and kept warm by the plastic 35 in the manifold cavity 34, so that the plastic 35 is cooled in the narrow hole (runner). Never hardens.

When the fixed side template 15a and the movable side template 15b are separated, the hoop material 21 that directly crosses the molding machine 18 is restricted in the width direction, and the medium acts as a medium to separate the insulator 5 from the tip of the runnerless nozzle. The plurality of hoop material guides 27 are each urged downward by a compression spring 36 and are pressed against the fixed side template 15.
It is movable up and down along guide pins 37 planted on the lower surface of the mold plate 15a, and holds the hoop material 21 at a certain distance from the mold plate 15a when the mold is released.

On the other hand, the mold forming part 15 of the fixed side template 15a
The movable template 15b has a mold forming part 15b' facing the guide post 38 at the center of the upper surface.
As a result, it is moved up and down while accurately maintaining the relative relationship with the stationary template 15a. That is, the upward movement of the movable template 15b also pushes up the hoop material guide 27 from the middle, and at the top dead center, a predetermined portion of the hoop material 21 is firmly clamped between the templates 15a and 15b. It becomes like this. This state is detected by, for example, a micro switch (not shown), and the information is transmitted to the molding machine 18 (second
When inputted to the control section shown in FIG. 3, a quantity of molten plastic 35 is injected from the manifold nozzle 30 into the cavity formed by the molding sections 15a' and 15b' to form the insulator 5. Next, when the movable template 15b descends from the top dead center, the newly formed insulator 5 is almost in a fixed state;
Since the plastic 35 in the manifold nozzle 30 is in a molten state, the plastic 35 is torn off at the boundary between the solidified state and the molten state, resulting in an insulator 5 without runners.

In the above embodiment, the continuous automatic molding device is configured by sequentially disposing a material feeding autoreel, a molding machine, and a winding autoreel, but other processing devices, such as a press device, are connected to the material feeding autoreel. It can be installed between the reel and the molding machine to continuously perform the required press processing on the long material wound on the feed material autoreel, and the marking device can be installed between the molding machine and the winding autoreel. It is also possible to arrange it so that symbols etc. can be continuously stamped on the molded product.

As explained above, according to the continuous automatic molding device of the present invention, there is no need for human labor such as inserting insert parts into the mold or taking out molded products from the mold, resulting in labor savings and molding speed. The peak was measured. In addition, since the hoop material guide that guides the hoop material near the cavity has the role of separating the molded product from the mold, there is no longer a need for ejector pins or other separating means that were required along with the guide in conventional equipment. Since the runnerless molded products are connected and wrapped, the automation of post-processes such as stamping, pinning, and assembly is easy and efficient, which has an extremely large practical effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a mechanical switch terminal board formed by connection molding, FIG. 2 is a front view of the overall configuration of a continuous automatic molding apparatus for the terminal board according to an embodiment of the present invention, and FIG. A perspective view of the apparatus on the exit side of the molding machine, FIG. 4 is a side view with a part of the runnerless mold installed in the molding machine in cross section, 5... Insulator (molded product), 11... Continuous automatic Mold forming device, 13, 20... Auto reel, 14... Material feed end detector, 15... Runnerless mold, 16... Air gripper, 17...
Hoop material feeding mechanism, 18...Mold forming machine, 2
1... Hoop material.

Claims (1)

[Claims] 1. A first auto-reel that sequentially delivers the wound long material as required when molding plastic by sequentially inserting a portion of a long material such as a hoop material into a predetermined position, and a mold forming machine. , consisting of a second autoreel that sequentially winds the long material inserted and molded in a predetermined manner as required;
The molding machine includes a runnerless mold for molding, a gripper that can grip the long material outside the delivery port, and a long material end detection device provided outside the introduction port for the long material. and a means for feeding the elongated material by a predetermined amount, and the fixed side template of the mold is provided with a runnerless nozzle and faces above the movable side template of the mold, and the fixed side template of the mold is equipped with a compression coil spring. A guide is provided which is biased and movable up and down and guides the elongated material at a position a certain distance away from the stationary mold plate, and the biasing force of the coil spring acts to mold the product at the tip of the nozzle. A continuous automatic mold forming device characterized by separating.