JPS6217268Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Technical field The present invention relates to a transfer molding device.

(b) Prior Art A transfer molding device is a device that inserts a transfer film between molds and transfers the design on the transfer film to a molded product at the same time as injection molding. A film feeding/positioning device is provided to precisely position the design on the transfer film at a predetermined position between the molds. In order to prevent the pattern from shifting when the mold is closed, a film fixing device is provided to fix the transfer film immediately before the mold is closed. An example of such a conventional transfer molding device is shown in the first example.
As shown in the figure. The transfer film 10 is transferred to a feeding side guide roll 16 and a guide 1 attached to a movable platen 12.
The upstream side of the movable mold 14 is supported by 8a and 18b, and the winding side guide roll 20 and the guide 2
The downstream side is supported by 2a and 22b.
A fixed mold 24 attached to a fixed platen 23 is provided with a clamp 26 pressed by a spring 25. Clamp 2 just before mold closing is completed.
6 contacts the transfer film 10 and securely fixes it with the movable mold 14. Next, after the mold is completely closed, the molded product 27 is molded. Next, when the mold is opened, the transfer film 10 is guided by the guide 18.
a, 18b and guides 22a, 22b, the molded product 27 is pulled off. That is, guides 18a, 18b and guides 22a, 2
2b has the function of guiding the transfer film 10 in a stable state and peeling off the transfer film 10 from the molded product 27. However, in such a transfer molding device, the clamp 26 and the guide 18
a, 18b and guides 22a, 22b are required, and guides 18a, 18b and guides 22a,
A large space was required to place the parts 22b above and below the mold. Moreover, when peeling off the transfer film 10 from the molded product 27, the transfer film 10
is strongly pressed against the guides 18b and 22b. Therefore, if the pattern on the transfer film 10 is stopped at the guide 18b, the pattern will be damaged. Therefore, it may be necessary to increase the pitch between the patterns so that the patterns do not come into contact with the guide 18b, resulting in waste in the transfer film 10.

(c) Purpose of the invention The present invention aims to reduce the size of the apparatus by configuring the clamp and the guide as one mechanism, and also to eliminate waste of transfer film.

(d) Structure of the invention The transfer molding device according to the invention is capable of transporting film and
A guide provided on one mold that is movable between a first position that brings the transfer film into close contact with the parting surface of the one mold that is provided with a positioning device and a second position that allows the transfer film to pass through. A clamp, a first elastic member provided on one mold so as to apply a force in the direction of the second position to the guide clamp, a push rod provided on the other mold so as to be movable in the axial direction, and a push rod provided on the other mold to be movable in the axial direction. a second elastic member provided on the other mold so as to apply force to the other mold;
When the mold is closed, the push rod and the guide clamp are arranged so as to be in contact with each other under the pushing force of the first elastic member and the second elastic member, and is made larger than the force of the first elastic member.

(E) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 2 to 5 of the accompanying drawings.

Fixed plate 30 and movable plate 32 each have a fixed type 3
4 and a movable mold 36 are attached. The fixed mold 34 has convex portions 34a and 34b, and the movable mold 36 has concave portions 36a and 36b. The convex portion 34a and the concave portion 36a constitute one molded portion, and the convex portion 34b and the concave portion 36b constitute the other molded portion. A frame 38 is attached to the movable platen 32, and the frame 3
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. Guide roll 4
A transfer film 44 is guided by 0 and 42. Further, the transfer film 44 is attached to the movable mold 3.
Three guide clamps 46a, 46b provided at 6
and 46c. The guide clamps 46a, 46b, and 46c are provided at the top, center, and bottom 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. . Further, the guide clamps 46a, 46b, and 46c have a length larger than the widthwise dimension of the transfer film 44, so that the entire width of the transfer film 44 can be fixed. The guide clamps 46a, 46b and 46c are movable type 36
The transfer film 44 is attached so as to be movable in the vertical direction with respect to the parting surface of the movable mold 36, and there is a gap between the first position where the transfer film 44 is fixed to the parting surface of the movable mold 36 and the parting surface of the movable mold 36. It is possible to move between a second position and a second position where the transfer film 44 is allowed to pass through.This will be described later with reference to FIGS. 4 and 5. Fixed type 34
includes guide clamps 46a, 46b and 46c.
Push rods 50a, 50b, and 50c are provided at positions corresponding to the respective positions. This push rod 50a, 5
0b and 50c will also be described later based on FIGS. 4 and 5. Molten resin can be injected into the fixed mold 34 from an injection nozzle 54. 4 and 5 show the guide clamp 46a and push rod 50a in detail (guide clamps 46b and 46c, and push rod 50a).
0b and 50c are guide clamps 46, respectively.
a and the push rod 50a). The guide clamp 46a is supported so as to be movable by a dimension C in the axial direction with respect to two stepped bolts 55a fixed to the movable mold 36. The C dimension is set larger than the D dimension, which indicates the amount of deformation of the transfer film 44 after molding, so as not to create resistance during film feeding. Guide clamp 46a
At the corner of the side that comes into contact with the transfer film 44,
The transfer film 44 is rounded so as not to be damaged. A spring 56a is arranged between the parting surface of the movable mold 36 and the guide clamp 46a. On the other hand, there are three push rods 50a in parallel.
The holes 58a of the fixed mold 34 support the holes 58a of the fixed mold 34 so as to be movable in the axial direction. push rod 50
The tip of a is located in a hole 60a provided in the fixed mold 34, and is held in place by nuts 62a and 64a screwed into the threaded portion of the other end so that it does not protrude beyond the parting surface of the fixed mold 34. The above movement in the axial direction is restricted. That is, dimension A in FIG. 4 can be adjusted by nuts 62a and 64a. Note that the A dimension is smaller than the B dimension. The push rod 50a is pressed toward the parting surface by a spring 52a.

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. The force of each of the three springs 52a, 52b and 52c is equal to the force of each of the two springs 56.
Since the forces are larger than those of the guide clamps 46a, 56b, and 56c, 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, the guide clamps 46a, 46
A transfer film 44 is sandwiched between b and 46c and the movable mold 36a. After fixing the transfer film 44 in this way, the movable mold 36 is moved to the fixed mold 3.
Closely attached to 4. 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
moves back together with the movable mold 36. That is, the transfer film 44 is pulled by the guide clamps 46a, 46b, and 46c, and moves to the left in FIG. 2 together with the movable mold 36. 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 transfer film 44 is guided and peeled off from the molded product 66 by the guide clamps 46a, 46b, and 46c. And there is no need to provide a guide at the bottom. Therefore, the structure is simplified and the required space is reduced, making it possible to downsize the device. Further, 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 the gap between each pattern 48 is reduced by the guide clamps 46a, 46b and 46.
All you need to do is to ensure that the dimension c can be touched, and the pattern 48
can be placed on the transfer film 44 in close proximity to each other.

In addition, in the above embodiment, the guide clamps 46a,
Although the transfer film 44 is sandwiched between the guide clamps 46b and 46c and the movable mold 36 at the same time, the timing at which each guide clamp operates can be shifted. That is, for example, the springs 56a, 56b and 56c are springs with the same force, and the springs 52a, 52b and 52c are
are of different specifications, and the A dimension in Fig. 4 is increased in order from the top.
6a clamps the transfer film 44, then the guide clamp 46b is activated, and then the guide clamp 46c is activated. The actuation timing of each guide clamp 46a, 46b, and 46c (that is, the timing at which dimension C becomes 0) is determined by how dimensions A, B, and C are set. By shifting the activation timing of the guide clamp, it is possible to prevent excessive elongation of the transfer film when the molded product is a deep one (i.e., when the transfer film is significantly deformed when the mold is closed). is obtained. Note that the springs 52a, 52b, and 52c and the springs 56a, 56b, and 56c may be other elastic members such as rubber. Further, although the above embodiments have been described with reference to a two-cavity mold, the present invention can be applied to a single-cavity mold or a multi-cavity mold with three or more molds. Further, although three sets of guide clamps are used in the described embodiment, it is also possible to provide a guide clamp only at the top and use a guide similar to the conventional one at the bottom.

(f) Effect of the invention As explained above, according to the invention, a transfer film is inserted between the molds and the design on the transfer film is transferred to the molded product at the same time as injection molding.
In a transfer molding device that peels off a transfer film from a molded product when the mold is opened, there is a first position where the transfer film is brought into close contact with the parting surface of one of the molds provided with a film feeding/positioning device, and a first position where the transfer film is placed in close contact with the parting surface of one of the molds provided with a film feeding/positioning device. a guide clamp provided on one mold so as to be movable between a second position and a first elastic member provided on one mold so as to apply a force in the direction of the second position to the guide clamp; (in the described embodiment, the spring 56a), a push rod provided in the other mold so as to be movable in the axial direction, and a push rod provided in the other mold so as to apply a force toward the one mold side on the push rod. The second elastic member (spring 52
a), in which the push rod and the guide clamp are arranged so as to be in contact with each other under the force of the first elastic member and the second elastic member when the mold is closed; Since the force of the elastic member is greater than the force of the first elastic member, the guide clamp can provide a fixing action and a guiding action for the transfer film, reducing the space required and making the device more compact. Furthermore, the design can be placed in close contact with 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 the drawing]

FIG. 1 is a diagram showing a conventional transfer molding device, FIG. 2 is a diagram showing a transfer molding device according to the present invention, FIG. 3 is a view taken along the - line in FIG. 2, and FIG.
FIG. 5 is an enlarged view showing the guide clamp of the transfer molding apparatus shown in the figure, and FIG. 5 is a cross-sectional view taken from FIG. 4 in a state where the mold is closed. 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, 50... Push rod, 50
a, 50b, 50c... push rod, 52a, 52b,
52c...Spring, 54...Injection nozzle, 5
5a, 55b, 55c... Bolt, 56a, 56
b, 56c... Spring, 58, 60... Hole,
62a, 64a...nut, 66...molded product.

Claims (1)

[Claims for Utility Model Registration] 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 metal molds is movable between a first position where the transfer film is brought into close contact with the parting surface of one of the metal molds and a second position where the transfer film is allowed to pass through. A guide clamp provided on the mold, a first elastic member provided on one mold so as to apply a force toward the second position on the guide clamp, and a first elastic member provided on the other mold movably in the axial direction. A second elastic member is provided on the other mold so as to apply a force to the push rod toward one of the molds, and when the mold is closed, the push rod and the guide clamp are closed. Transfer molding characterized in that the first elastic member and the second elastic member are arranged so as to be in contact with each other under a pressing force, and the force of the second elastic member is larger than the force of the first elastic member. Device. 2. A plurality of sets of guide clamps and push rods are provided, and the first elastic member and push rod of each set are arranged so that each set of guide clamps fixes the transfer film between one mold and the other at different times in the mold closing process. The transfer molding apparatus according to claim 1, wherein the relative positional relationship of the second elastic members is different.