JPH0246988Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous printed film feeding device with a pattern printed thereon for an injection molding device, and is particularly applicable to an injection molding device that performs injection molding at the same time as trimming a printed film. The present invention relates to a printing film feeding device that continuously feeds printing film.

[Prior art and its problems]

BACKGROUND ART There are resin molded products such as automobile parts, electrical products, and daily necessities that have a printed film with a pattern printed on them adhered to the surface.

In order to obtain a molded product with such a printed film attached, an injection molding device having a fixed mold and a movable mold is prepared, and a printed film pre-printed by the operator is inserted one by one between both molds. I was gone. Therefore, it was extremely inefficient and had poor productivity.

Therefore, an apparatus has been proposed in which a strip of printing film is intermittently fed between molds to continuously decorate injection molded products. However, in such a conventional device, although the printing film can be trimmed using a mold consisting of a fixed mold and a movable mold, wrinkles may be formed on the film surface when punching the printed film. There was a problem. That is, when trimming a printed film, when the movable mold moves to clamp the mold, the printed film is pulled by the movable mold and locally bulges, resulting in partial wrinkles. In addition, since the printed film after trimming has rectangular punch holes formed continuously at a predetermined pitch, when a tensile force for winding is applied to the printed film, it deforms unevenly and wrinkles occur. Ta.

[Purpose of invention]

This idea was devised in view of the above circumstances.
The purpose of this is to connect a part of the printing film feeding device with a movable type to enable synchronized movement, and to support the printing film vertically when trimming or winding the printing film. An object of the present invention is to provide a printing film feeding device that can prevent wrinkles from forming on the printed film.

[Summary of the idea]

In a printing film feeding device that is installed in an injection molding device that injects molten resin into a cavity between a fixed mold that is a male mold and a movable mold that is a female mold, and that continuously feeds a printing film between the fixed mold and the movable mold. , a printing film support device in which a film roll and a feed roll are arranged is supported on the movable mold so as to be slidable in the direction of movement thereof, and between the fixed mold and the movable mold, the printing film support device is movable toward and away from both molds. An intermediate mold is arranged, and the intermediate mold is supported by the printing film supporting device, and a film guide roller that changes the feeding direction of the printing film and a pair of take-up rolls that can freely sandwich the printing film are connected to the intermediate mold so that the printing film can be placed in the intermediate mold. The printing film is supported from the above-mentioned printing film supporting device in a position where it hangs down along the end surface of the printing film, and when the movable die is moved by clamping during trimming of the printing film, the printing film support on this movable die is While the intermediate mold supported by the device is pushed and driven by the movable mold, the film guide roller and take-up roll also move together with the intermediate mold, so the printing film suspended and supported by the film guide roller is , can always be kept straight by its own weight. In addition, when the printing film is wound up after trimming, the intermediate mold, film guide roller, and take-up roll are driven as the movable mold moves, so that the printing film is suspended and supported by the film guide roller. The film can always remain straight.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a printing film feeding device for an injection molding apparatus according to the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a longitudinal cross-sectional view of a printing film feeding device of an injection molding apparatus. In FIG. 1, reference numeral 1 denotes a fixed mold forming a male mold. This fixed mold 1 is integrally fixed to a fixed platen 2, and a guide rod g is implanted in the fixed mold 1. A blade portion 1a is provided around the protruding end of the fixed mold 1, and the printing film 14a is trimmed by the cooperation of this blade portion 1a and a blade portion 18a (described later) of the intermediate mold 18.

Further, an injection device 3 is inserted into the center of the fixed mold 1 and the fixed platen 2, and the molten resin is injected from the injection device 3 and is ejected from an injection hole 4 formed in the fixed mold 1. There is.

On the other hand, a female movable mold 8 is fixed to a movable plate 7 located opposite to the fixed plate 2, and this movable mold 8 moves toward and away from the fixed mold 1 in the horizontal direction. The contact and separation movements are performed by a pressurizing ram connected to the movable platen 7. Further, engagement members 10, 10 are fixed to the upper surface of the movable plate 7 near both sides thereof.
The engagement piece 11a of the film support member 11 is engaged with the engagement groove 10a of the film support member 11, so that the film support member 11 can freely slide on the movable platen 7.

The film support member 11 is formed with a substantially concave cross-sectional shape, and has both side plates 11a projecting upward.
A rotary roll 12 is supported on the rotary roll 12, and a film roll 14 wound around the rotary roll 12 is rotatably supported. Further, in front of the rotary roll 12, delivery rolls 15 and 16 for delivering the printed film are arranged, and these delivery rolls 15 and 16 are rotatably supported by the side plates 11a. The delivery roll 15 is rotationally driven by a drive motor _M1 directly connected to its drive shaft 15a, and as the delivery roll 15 is driven, the delivery roll 16 is driven.

Further, an intermediate mold 18 is located between the fixed mold 1 and the movable mold 8, and is movable toward and away from both the molds 1 and 8. Along with being supported by 11,
It is guided by a guide rod g and biased toward the movable mold side by springs 27, 27 attached to the guide rod g. A film guide roller 21 is provided protruding from the front surface of the support member 11, and the peripheral edge of the tip of the film guide roller 21 is set at a position that coincides with the extension line of the front end surface of the intermediate die 18. The printing film 14a hanging down from the guide roller 21 hangs down along the end surface of the intermediate mold 18.

A rectangular opening 20 is formed in the intermediate mold 18, and the edge of the opening forms a blade portion 18a, which cooperates with the blade portion 1a of the fixed mold 1 to open the printing film 14.
a is trimmed. Then, the intermediate mold 18
The opening 20 and the recess 9 formed in the movable mold 8 form a cavity.

Further, winding rolls 23 and 24 are disposed opposite to each other below the intermediate mold 18 so as to be able to clamp and unclamp the printing film 14a, and these winding rolls 23 and 24 are rotated by a hanging support member 25. One of the take-up rolls 23, which is freely supported, is rotationally driven by a drive motor _M2 directly connected thereto, and the take-up roll 24 is driven accordingly.
Note that the contact surfaces of the take-up rolls 23 and 24 in the clamped state are set on an extension line of the end surface of the intermediate die 18.

Further, above and below the intermediate mold 18, detectors 26, 26 such as phototubes are provided to detect the mark T on the printing film 14a, respectively, and the printing film 14a is set at a predetermined position for trimming. Detect what happened.

Next, the operation of the printing film feeding device constructed as described above will be described.

First, the drive motor _M1 is driven to rotate the delivery rolls 15 and 16, and the printing film 14a is unwound from the wound film roll 14. Then, when the printing film 14a is unwound one after another, it hangs down from the film guide roller 21 and comes into a state along the end surface of the intermediate mold 18, as shown in FIG. Then, when the printing film 14a is pulled out by a predetermined amount and the detector 25 detects the mark T on the printing film 14a, the drive motor _M1 is stopped. At this time, the printing film 14a is set at the correct position for trimming.

Next, when the movable platen 7 starts moving toward the fixed mold 1 by the pressure ram, only the movable platen 7 and the movable mold 8 fixed thereto move at the beginning of the movement, and the film support member 11 is moved by the spring 27. It slides on the movable plate 7 and remains at the initial position. Then, when the tip of the movable mold 8 comes into contact with the rear end surface of the intermediate mold 18, the intermediate mold 18 is pushed, so that the film support member 11 also begins to move together with the movable mold 8.
At this time, the film clamp (not shown) is
The printing film 14a on the top 8 is clamped to prevent the printing film 14a from shaking. As the film support member 11 moves, the film guide roller 21 fixedly supported by the film support member 11 also moves, so that the printing film 14a is always suspended from the film guide roller 21 and is drawn along the end surface of the intermediate mold 18. Continue moving while maintaining the state. As the movable mold 8 continues to move further, the intermediate mold 18 is combined with the fixed mold 1 as shown in FIG. 3, and at this time the printing film 14a is trimmed by the blade portions 1a and 18a.
Further, when the recess 9 of the movable mold 8, the opening 19 of the intermediate mold 18, and the fixed mold 1 are combined, a cavity is formed between them.

Next, molten resin is injected into this cavity from the injection machine 3, and the printing film 14a trimmed by the jet at the time of injection is adhered to the inner wall of the recess 9 and at the same time the injected molten resin Molded product F is produced. As shown in FIG. 4, the molded product F is formed with a printing film heat-sealed to the upper surface of the main body.

After that, if the movable plate 7 is moved to return to its original state (moved to the left in FIG.
move away from

Along with this, the intermediate mold 18 and the film guide roller 21 move, and the printing film 14a is also separated from the fixed mold 1, returning to the original state shown in FIG.

Next, the delivery rolls 15 and 16 and the take-up roll 2
3 and 24 are rotated synchronously to peel off the printing film 14a from the intermediate mold 18, and then the take-up rolls 23 and 24 are unclamped and the take-up roll 2
Release the contact between 3 and 24. Then, by rotating only the delivery rolls 15 and 16, the printing film 14a is sent out while hanging down due to its own weight.

The printing film according to this invention is PP film,
In addition to thermoplastic films such as PS film and acrylic film, thermosetting decorative papers such as melamine-impregnated paper are also available, and can be applied to a wide range of applications.

In the printing film feeding device shown in FIGS. 1 to 3, the recess 9 of the movable mold 8 is connected to a vacuum suction device, vacuum preforming is performed to fix the printing film 14a to the inner wall of the recess 9, and then By injection molding, it is possible to obtain a molded product without wrinkles or distortion in the printed film.

[Effects of the invention] As is clear from the description of the embodiments, according to the invention, when the movable die is moved by clamping during trimming of the printing film, the printing film is supported by the printing film supporting device on the movable die. While the intermediate mold is pushed and driven by the movable mold, the film guide roller and take-up roll also move together with the intermediate mold. Therefore, it can be supported hanging down along the end surface of the intermediate mold while always maintaining a straight state. Therefore, unlike conventional devices, when trimming a printing film, the printing film is pulled by the movable die and bulges locally, which eliminates the drawback of wrinkles occurring locally.

Furthermore, according to the present invention, even when winding up after trimming, the printed film can be wound only by its own weight without applying any tensile force to the printed film, so that the printed film is not unevenly deformed and wrinkled. There is no fear of it happening.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the printing film feeding device of an injection molding apparatus according to the present invention, Fig. 2 is a front view seen from the direction of the arrow in Fig. 1, and Fig. 3 is a printing film feeding device. An explanatory diagram showing the operating state of the device,
FIG. 4 is an overall perspective view of the printed film molded product. DESCRIPTION OF SYMBOLS 1... Fixed type, 2... Fixed plate, 3... Injection device, 7... Moving plate, 8... Movable type, 10... Engaging member, 11... Film support member, 12... Rotating roll, 14...Film roll, 15, 16...
...Delivery roll, 18...Intermediate mold, 21...Film guide roller, 23, 24...Take-up roll, 2
5...Detector.

Claims (1)

[Scope of utility model registration request] In a printing film feeding device that is installed in an injection molding device that injects molten resin into a cavity between a fixed mold that is a male mold and a movable mold that is a female mold, and that continuously feeds a printing film between the fixed mold and the movable mold. , a printing film support device in which a film roll and a feed roll are arranged is supported on the movable mold so as to be slidable in the direction of movement thereof, and between the fixed mold and the movable mold, the printing film support device is movable toward and away from both molds. An intermediate mold is arranged, and the intermediate mold is supported by the printing film supporting device, and a film guide roller that changes the feeding direction of the printing film and a pair of take-up rolls that can freely sandwich the printing film are connected to the intermediate mold so that the printing film can be placed in the intermediate mold. 1. A printing film feeding device for an injection molding apparatus, characterized in that the printing film feeding device is supported from the printing film supporting device at a position hanging down along an end surface of the printing film.