JPH07164483A - Injection molding machine - Google Patents

Abstract

PURPOSE:To transfer a pattern surely at reduced costs by cutting a transfer film set in a mold. CONSTITUTION:A film 5 is fed between a cavity mold 1 and a core mold and stopped at a specified position. After the film 5 being contacted with the cavity mold 1 by a film holder 22, a film cutter 24 is moved within the film holder 22 to cut the film 5. After a slide mold 11 being projected to a specified depth, a resin is injected into a space between the cavity mold 1 and the core mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus and, more particularly, to an improvement in injection molding technology for transferring a pattern drawn on a film to an injection molded article simultaneously with injection molding.

[0002]

2. Description of the Related Art There is an injection molding technique in which a transfer film is brought into contact with a mold and a pattern drawn on the transfer film is simultaneously transferred to an injection-molded article by injection molding.
Before the resin and the film are integrally molded, holes are previously formed in the film at a position where the film receives a local force during and after the molding, and the resin and the film are integrally molded. There is a method (JP-A-1-184)
No. 113).

[0003]

However, such a conventional molding method is a molding method in which a hole is preliminarily formed in the transfer film and the hole is set at a position where the force is locally received. Therefore, a large tension may act on the hole due to the tension acting on the film, and the tension deforms the hole or, in the worst case, breaks the transfer film.

Further, since the transfer film has a hole formed in advance and the hole portion is set in a mold so that the film is in a position to receive a force locally during and after the film forming, the hole portion is formed. It is necessary to accurately position the film at a predetermined position, which requires high accuracy in the control of the position sensor used for positioning and the film feeding device, which may lead to an increase in cost.

The present invention has been made in view of the above circumstances. The transfer film is set in a mold and then the film is cut so that a reliable pattern transfer can be performed at low cost and further shearing can be performed. An object of the present invention is to provide a low-cost injection molding apparatus by forming a rising portion of a molded product at a location.

[0006]

Therefore, the present invention provides an injection molding apparatus for transferring a pattern drawn on the transfer film to an injection molded article simultaneously with injection molding by bringing the transfer film into contact with a mold. A configuration is provided in which a gripping unit that grips at a predetermined position and a shearing unit that shears the transfer film gripped by the gripping unit are provided.

Further, a moving member that moves in a direction perpendicular to the transfer film surface at the sheared portion sheared by the shearing means and forms a rising portion of the molded product may be provided.

[0008]

The transfer film is fixed in a state of being in contact with the mold by being held at a predetermined position by the holding means. Then, the hole is formed by being sheared by the shearing means while being held. Further, in the configuration in which the moving member is moved in the direction perpendicular to the transfer film surface at the sheared portion sheared by the shearing means to form the rising portion of the molded product, the shearing means is kept in the gripped state. The moving member moves to the hole formed by the shearing due to, and there is no deviation between the hole and the moving position of the moving member, so that the recess can be formed accurately and reliably. Become.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are schematic side sectional views of an injection molding apparatus according to the first embodiment of the present invention. On both sides of the film 5 fed by the foil feeding device 3, a mold 1 and a core 2 are arranged, and the mold 1 is provided with a film clamp 9 for gripping and fixing the film 5, and the film clamp 9 is also provided. 5
A sensor 6 for measuring the stop position of the film 5 is provided on the traveling path of the.

A heater unit 4 is movably provided between the film 5 and the core mold 2 so that the film 5 can be preformed in cooperation with the suction device 7 provided in the mold 1. Has become. In the first embodiment, as shown in FIGS. 2 and 3, a hole 10 is provided at a predetermined position of the mold 1, and an air cylinder 12 is provided in the hole 10 in a direction perpendicular to the feeding direction of the film 5. A slide mold 11 that can slide is provided.

Further, in the heater unit 4, a film holder 22 driven to project toward the mold 1 and a film serving as a shearing means by an air cylinder 20 in a direction perpendicular to the feeding direction of the film 5. Cutter
24 are provided. A coil spring 25 for urging the film cutter 24 toward the air cylinder 20 is provided on the back surface of the film holder 22.

Next, the integral molding of the resin and the film using the injection molding apparatus having the above construction will be described. Foil feeder 3
Thus, the film 5 sent between the mold 1 and the core mold 2 is stopped at a predetermined position after the sensor 6 measures the stop position. Then, it is placed on the mold 1 by the film clamp 9 and is held and fixed.

In this state, the heater unit 4 moves between the cavity mold 1 and the core mold 2 and stops at a predetermined position. At this time, the film holder 22 and the film cutter 24 provided on the heater unit 4 are separated from the mold 1. Then, when the air cylinder 20 is driven, the film holder 22 and the film cutter are initially
24 moves integrally, and the film holder 22 presses the film 5 against the mold 1. That is, the film 5 is a film holder
It is firmly gripped and fixed between 22 and the mold 1. That is,
The film holder 22 and the mold 1 function as a holding means.

When the air cylinder 20 is further driven and the pressing force of the air cylinder 20 becomes larger than the urging force of the coil spring 25, the film cutter 24 is moved to the film holder.
22 The inside is moved in a direction approaching the film 5, and the film 5 is sheared. Then, the heater of the heater unit 4 is operated to soften the film 5, the suction device 7 provided in the mold 1 is operated to vacuum form the film 5, and the film 5 is brought into contact with the mold 1.

After that, the air cylinder 20 is driven in the opposite direction, the film holder 22 and the film cutter 24 are retracted, and the heater unit 4 is moved out of the mold from between the mold 1 and the core mold 2. After the heater unit 4 moves out of the mold, the cavity mold 1 and the core mold 2 are aligned with each other, and the air cylinder 12 is driven to form the slide mold 11 to form a recess having a predetermined depth as a rising portion. 5 slides in a direction perpendicular to the feeding direction, and projects and stops at the predetermined depth.

Then, a resin injection device (not shown) injects resin into the gap 14 between the cavity mold 1 and the core mold 2, and after cooling, the cavity mold 1 and the core mold 2 are opened. At this time, the film 5 is separated from the injection molded product, and as shown in FIG.
The pattern of the film 5 is transferred onto the one surface 30a of the film 30. As described above, in the first embodiment, the film 5 sent between the mold 1 and the core 2 is the film holder.
The film 5 is firmly gripped and fixed between the mold 22 and the mold 1, and in that state, it is sheared by the film cutter 24, and in that condition, heat is applied by the heater unit 4 to perform vacuum forming, and the film 5 is completely caved. Since the injection molding is performed after the mold 1 is shaped, the film 5 is not subjected to uneven tension, and the holes sheared by the film cutter 24 are deformed or damaged. Absent.

Further, since the film 5 is not provided with holes from the beginning, the positional accuracy between the film 5 and the mold 1 does not become higher than necessary, and the position sensor used for positioning is used. Since it is not necessary to increase the control accuracy of 6 and the foil feeding device 3 and the film 5 can be fed by a timer set or the like, the cost can be reduced.

Next, an injection molding apparatus according to the second embodiment of the present invention will be described with reference to FIGS. still,
The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. A cavity mold 41 and a core mold 42 are arranged on both sides of the film 5 fed by the foil feeding device 3 (not shown).

A heater unit 4 (not shown) is movably provided between the film 5 and the core mold 42 to preform the film 5. In the second embodiment, as shown in FIGS. 2 and 3, a hole 45 is provided at a predetermined position of the mold 41, and an air cylinder 47 is provided in the hole 45.
A cylindrical slide die 46 is provided which can be slid in a direction perpendicular to the feeding direction of the film 5.

Further, inside the cylindrical slide die 46, there is provided a film cutter 48 which is driven to project toward the core die 42 by the air cylinder 49 so as to be perpendicular to the feeding direction of the film 5. It is provided. on the other hand,
A hole 51 is formed in the core mold 42 at a position facing the slide mold 46.
The hole 51 is provided with a cylindrical film holder 53 which is slid by an air cylinder 52 in a direction perpendicular to the feeding direction of the film 5.

Here, the cylindrical slide die 46 and the cylindrical film holder 53 are provided on the same axis, the inner diameter of the slide die 46 and the inner diameter of the film holder 53 are substantially equal, and the film cutter 48 slides. It has a movable inner diameter. Next, the integral molding of the resin and the film using the injection molding apparatus having the above configuration will be described.

The film 5 fed between the cavity die 41 and the core die 42 by the foil feeding device 3 is stopped at a predetermined position, placed on the cavity die 41 and held and fixed. In this state, the heater unit 4 moves between the cavity mold 41 and the core mold 42 and stops at a predetermined position. At this time, the film holder 53 provided in the core die 42 is in a state of being separated from the cavity die 41, and the cylindrical slide die
46 forms the same surface as the mold 41.

When the air cylinder 52 is driven,
The film holder 53 moves toward the mold 41, and the film holder 53 moves the film 5 into the mold 1 and the slide mold 46.
To press and fix the film 5 (see FIG. 6). Then, the air cylinder 49 is driven to drive the film cutter 48.
Moves inside the slide die 46 toward the film 5, and the film 5 is sheared while being held by the slide die 46 and the film holder 53 (see FIG. 7). That is, the slide die 46 and the film holder 53 perform the functions of the gripping means and the shearing means.

As shown in FIG. 8, resin is filled in the gap 55 between the cavity mold 41 and the core mold 42. The resin is filled by the pressure sensor 56 provided near the outer periphery of the slide mold 46.
The filling amount can be detected by. Then, with the pressure sensor 56, the above-mentioned gap is formed in the vicinity of the outer peripheral portion of the slide mold 46.
When it is detected that 55 has been filled with resin, as shown in FIG.
46 slides by the air cylinder 47, and the film holder 53 slides by the air cylinder 52 to form a start-up gap 58. That is, the film holder 53 has a function as a moving member that moves in the direction perpendicular to the transfer film surface at the sheared portion sheared by the shearing means and forms the rising portion of the molded product.

Then, a resin is filled into the rising gap 58 from another gate (not shown) to form a rising portion (see FIG.
After cooling, open the mold 41 and the core mold 42. At this time, the film 5 is separated from the injection molded product, and the pattern of the film 5 is transferred to the one surface 60a of the injection molded product 60 as shown in FIG. As described above, in the second embodiment as well, the film 5 sent between the cavity mold 41 and the core mold 42 is held by the slide mold 46 and the film holder 53 by the film cutter 48. After being sheared, injection molding around the rising portion is performed in that state, and the film 5
Since the injection molding of the rising portion is performed after the mold has been completely shaped into the mold 41, the film 5 does not have a non-uniform tension, and thus the hole sheared by the film cutter 48 is used. The part will not be deformed or damaged.

Further, since the film 5 is not provided with holes from the beginning, the film 5 is also provided in the second embodiment.
The position accuracy between the mold and the mold 41 is not made higher than necessary, and the cost can be reduced.

[0027]

As described above, according to the present invention, the transfer film is gripped at a predetermined position by the gripping means, and is sheared by the shearing means while being fixed in the state of being in contact with the mold, and the hole portion is formed. Since the holes are not deformed or the transfer film is not damaged, the positioning accuracy between the transfer film and the mold does not need to be high, and the cost can be reduced. The effect is that

Further, by forming the rising portion of the molded product at the sheared portion sheared by the shearing means, there is no deviation between the sheared portion and the rising portion,
Therefore, it is possible to reliably form the rising portion (recess).

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic partial side sectional view of the device according to the above embodiment.

FIG. 3 is a schematic partial side sectional view of an apparatus according to the above embodiment.

FIG. 4 is a schematic partial side sectional view of the device according to the above embodiment.

FIG. 5 is a cross-sectional view showing a molded product molded according to the above example.

FIG. 6 is a schematic partial side sectional view of an apparatus according to a second embodiment of the present invention.

FIG. 7 is a schematic partial side sectional view of the device according to the above embodiment.

FIG. 8 is a schematic partial side sectional view of the device according to the above embodiment.

FIG. 9 is a schematic partial side sectional view of the device according to the above embodiment.

FIG. 10 is a schematic partial side sectional view of the device according to the embodiment.

FIG. 11 is a cross-sectional view showing a molded product molded according to the above example.

[Explanation of symbols]

 1 Cavity type 2 Core type 5 Film 11 Slide type 22 Film holder 24 Film cutter

Claims (2)

[Claims] 1. An injection molding apparatus for bringing a transfer film into contact with a mold to transfer a pattern drawn on the transfer film onto an injection-molded article at the same time as injection molding, and a holding means for holding the transfer film at a predetermined position. An injection molding apparatus comprising: a shearing unit that shears the transfer film gripped by the gripping unit. 2. A moving member that moves in a direction perpendicular to a transfer film surface at a sheared portion sheared by the shearing means to form a rising portion of a molded product. Injection molding equipment.