JPH0159096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a transfer molding device that performs transfer simultaneously with injection molding.

(b) Conventional technology As a conventional transfer molding device,
There is one shown in Publication No. 139311. This shows a transfer molding device having a clamp device for fixing a transfer film. This prevents displacement of the transfer film during mold clamping, allowing more precise transfer molding to be performed.

(C) Problems to be Solved by the Invention However, this clamp device does not have a guide bar that is necessary to guide the transfer film when feeding it and to peel the transfer film from the molded product after molding. Separately provided. Since the crank device and the guide bar must be placed above and below the molding section, there is a problem in that a larger molding section cannot be secured within the mold having limited external dimensions. In addition, if the clamp device and guide bar come into contact with the pattern on the transfer film, the pattern will be damaged, so the gap between the pattern on the transfer film and the pattern should be increased, and the clamp device and guide bar should be able to handle the pattern on the transfer film. It is necessary to make contact with the gap between them. For this reason, there is also the problem that the size between the patterns becomes large and there is a lot of wasted transfer film. The present invention solves the above-mentioned problems and provides a mechanism for preventing the transfer film from shifting when performing transfer at the same time as molding, and a mechanism for clamping the transfer film when peeling off the transfer film after transfer molding. The purpose of the present invention is to obtain a transfer molding device in which a mechanism is arranged in a simple structure.

(d) Means for solving the problems The present invention provides the functions of a clamp device and a guide bar in one member (guide clamp), and also fixes the transfer film by elastic force when the mold is closed. The above problems are solved by providing a combination of structures. That is, in the transfer molding apparatus according to the present invention, one of the molds is provided with a guide clamp and a guide clamp moving device for moving the guide clamp, and the guide clamp is in close contact with one of the molds and moves the transfer film. It can be moved by a guide clamp moving device between a position where it is clamped and fixed and a position where a gap is formed between the two molds and the transfer film is allowed to pass through, and the transfer film is moved between the two molds. is equipped with a push rod that is movable in the axial direction and an elastic member that applies force to the push rod, and the push rod is transferred directly or through a guide clamp by the force of the elastic member when the mold is closed. The plastic film is pressed against one of the molds.

(E) Effect With the above structure, when the mold is closed, the transfer film is pressed against one of the molds either directly by the push rod pressed by the elastic member or via the guide clamp. be done. Therefore, the transfer film is prevented from shifting when transfer is performed simultaneously with injection molding. Further, when the mold is opened, the guide clamp moving device is operated to press the transfer film against one of the molds by the guide clamp. This allows the transfer film to be reliably removed from the molded product.

(F) Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 6 of the accompanying drawings.

As shown in FIG. 1, a fixed platen 30 and a movable platen 3
A fixed mold 34 and a movable mold 36 are attached to each of the molds 2 and 2. The fixed mold 34 has convex parts 34a and 34
b, and the movable mold 36 has recesses 36a and 36b. Convex portion 34a and concave portion 36
One molded part is constituted by a, and the convex part 34b
The other molded portion is constituted by the recessed portion 36b. A frame 38 is attached to the movable platen 32, a guide roll 40 is attached to the upper part of the frame 38, and a guide roll 42 is attached to the lower part of the frame 38. A transfer film 44 is guided by guide rolls 40 and 42. Further, the transfer film 44 is guided by three guide clamps 46a, 46b and 46c provided on the movable mold 36. Guide clamps 46a, 46b and 46
C are provided at the upper, middle, and lower parts of the movable mold 36, respectively, and are arranged at the same pitch as the pattern 48 on the transfer film 44, as shown in FIG. In addition, guide clamps 46a, 46b
and 46c have a length larger than the width direction dimension of the transfer film 44, so that the entire width direction of the transfer film 44 can be fixed. Guide clamps 46a, 46b and 4
6c is attached so as to be movable in a direction perpendicular to the parting surface of the movable mold 36, and is placed between the parting surface of the movable mold 36 and the parting surface of the movable mold 36 at a position where the transfer film 44 is fixed between the parting surface of the movable mold 36 and the transfer film 44. A transfer film 44 is formed with a gap between the
It is possible to move between the positions that allow the passage of. The guide clamps 46a, 46b and 46c are moved between the two positions by a guide clamp moving device 47 to which they are connected. Fixed type 3
4 includes guide clamps 46a, 46b and 46
Push rods 50a and 50b are placed at positions corresponding to c.
and 50c are provided. This push rod 50a,
50b and 50c will be described later based on FIGS. 3 and 4. Molten resin can be injected into the fixed mold 34 from an injection nozzle 54.

3 and 4 show the guide clamp 46a and push rod 50a in detail (guide clamps 46b and 46c and push rods 50b and 50c are similar to guide clamp 46a and push rod 50a, respectively). The guide clamp 46a is supported by two rods 55a so as to be movable in the axial direction relative to the movable die 36. The rod 55a is connected to the guide clamp moving device 47 mentioned above. The corner of the guide clamp 46a on the side that contacts the transfer film 44 is rounded so as not to damage the transfer film 44. In addition, a part or the entire surface of the guide clamp 46a that contacts the transfer film 44 is provided to prevent the transfer film 44 from being damaged and to prevent the transfer film 44 and the guide clamp 46a from slipping. In order to do this, it is preferable to provide an elastic body such as rubber. On the other hand, three push rods 50a are provided in parallel and are supported by holes 58a of the fixed mold 34 so as to be freely movable in the axial direction. The tip of the push rod 50a is located in a hole 60a provided in the fixed part 34, and a nut 62 is screwed into the threaded part at the other end so as not to protrude beyond the parting surface of the fixed mold 34.
a and 64a restrict movement in the axial direction beyond a predetermined value. The push rod 50a is a spring 52
It is pressed toward the parting surface side by a (elastic member).

Next, the operation of this embodiment will be explained. First, in the mold open state, the transfer film 44 is fed and positioned by two patterns 48 by a film feeding/positioning device (not shown). Next, the movable platen 32 moves forward toward the fixed platen 30, and a mold closing operation is performed. When the movable mold 36 approaches the fixed mold 34, the guide clamps 46a, 46b and 46c come into contact with the push rods 50a, 50b and 50c. When the movable mold 36 moves further forward, the guide clamps 46a, 46b, and 46c are pushed toward the movable mold 36. For this reason, guide clamps 46a, 46b
and a spring 5 between 46c and the movable mold 36a.
The transfer film 44 is strongly pinched by the forces 2a, 52b, and 52c. At the same time or after the transfer film 44 is positioned, the guide clamp moving device 47 also operates to move the guide clamps 46a, 46b, and 46c to the movable mold 3.
Pull it to the 6th side. After the transfer film 44 is fixed in this manner, the movable mold 36 is brought into close contact with the fixed mold 34.
In this way, the mold closing operation is completed, and the molten resin is injected from the injection nozzle 54, and molding and transfer are performed. Then, after cooling, the mold opening operation is started. The molded product 66 is held on the fixed mold 34 by an undercut, while the transfer film 44 is held on the movable mold 36.
retreat with. That is, the transfer film 44
The movable mold 3 remains pressed against the movable mold 36 by the guide clamps 46a, 46b and 46c.
6 to the left in FIG. Therefore, the transfer film 44 is peeled off from the molded product 66. After the transfer film 44 is peeled off from the molded product 66, the molded product 66 is ejected by an ejector pin (not shown). In this way, one molding cycle is completed.

As is clear from the above description, in this transfer molding device, the guide clamps 46a, 46b and 4
Since the transfer film 44 is guided and pressed against the movable mold 36 by the guide 6c, there is no need to provide separate guides above and below the movable mold 36. Therefore, the structure is simplified and the required space is reduced, making it possible to downsize the device. Furthermore, since there is no need to provide a guide, there is no need to consider preventing contact between the guide and the pattern 48, so ensure that the gap between each pattern 48 is large enough to allow the guide clamps 46a, 46b, and 46c to come into contact with each other. The patterns 48 can be placed close to each other on the transfer film 44. Furthermore, during mold closing, the guide clamps 46a, 46b are held by the push rods 50a, 50b, and 50c, and the springs 52a, 52b, and 52c.
and 46c are pressed against the movable mold 36 with strong force, so that the transfer film 44 will not be misaligned during transfer molding.

Note that the guide clamp is not limited to the bar-shaped one as described above, but may also be a so-called spectacle-shaped guide clamp 46' as shown in FIG. 5, for example. Further, in the above embodiment, the push rod 50
a, 50b and 50c guide clamps 46a, 4
6b and 46c are pressed against the movable die 36, for example, as shown in FIG. 6, the push rod 50a' may directly contact the transfer film 44 and press it. The shape of this push rod 50a' is
It can also be shaped like a bar or glasses. Further, the springs 52a, 52b and 52c may be other elastic members such as rubber. Further, in the above embodiments, a two-cavity mold has been described, but the present invention can be applied to a single-cavity mold or a multi-cavity mold with three or more molds.

(g) Effects of the invention As explained above, according to the present invention, one mold is provided with a guide clamp, and the other mold is provided with a push rod and an elastic member, so that the mold can be easily closed and opened. The transfer film can be securely fixed, and the guide clamp can provide a fixing and guiding effect for the transfer film, reducing the space required and downsizing the device. The design can be placed closely on the transfer film, and waste of the transfer film can be eliminated. This means that the mold can be downsized at the same time.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a transfer molding apparatus according to the present invention;
Figure 2 is a view taken along the - line in Figure 1;
The figure is an enlarged view of the guide clamp and push rod of the transfer molding device shown in Figure 1, Figure 4 is a sectional view taken along the - line in Figure 3 with the mold closed, and Figures 5 and 6. 2A and 2B are diagrams showing different embodiments, respectively. 30... fixed plate, 32... movable plate, 34... fixed type, 34a, 34b... convex part, 36... movable type, 36a, 36b... recessed part, 38... frame, 40, 42... guide Roll, 44... Transfer film, 46a, 46b, 46c... Guide clamp, 48... Design, 50a, 50b, 50
c... Push rod, 52a, 52b, 52c... Spring (elastic member), 54... Injection nozzle, 66...
…Molding.

Claims (1)

[Claims] 1. A transfer molding device that inserts a transfer film between molds, transfers the design on the transfer film to a molded product at the same time as injection molding, and peels off the transfer film from the molded product when the mold is opened, One of the molds is provided with a guide clamp and a guide clamp moving device that moves the guide clamp. It is movable by a guide clamp moving device between a position where a gap is formed between the mold and the transfer film is allowed to pass through, and a guide clamp is provided on the other mold so as to be movable in the axial direction. A push rod and an elastic member that applies force to the push rod are provided,
1. A transfer molding apparatus, characterized in that the push rod is arranged so as to press the transfer film against one mold directly or via a guide clamp by the force of an elastic member when the mold is closed.