JPH10230531A - Apparatus for producing decorated molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorated molded product producing apparatus capable of more shortening a molding cycle in a constitution simpler as compared with a conventional apparatus. SOLUTION: A press core 40 for prestretching a decorative sheet S and a molded product taking-out jig 50 for taking out a molded product W are mounted on the common arm 60 freely inserted and extracted between opened molds 14, 15 to make the insertion/extraction mechanism of the press core 40 and the molded product taking-out jig 50 with respect to the gap between the molds 14, 15 common not only to simplify constitution but also to shorten the required time for the sheet prestretching process and the molded product taking-out process in a mold opened state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a decorative molded product using a decorative sheet. By injecting molten resin into the cavity with the decorating sheet in close contact with the cavity, the decorating sheet is insert-molded, or the decorating sheet is used as a transfer sheet, and the printing is performed on the sheet. The present invention relates to an apparatus for transferring a portion to a molded article surface.

[0002]

2. Description of the Related Art There is known an in-mold molding method in which a decorative sheet is brought into close contact with a cavity surface in advance during injection molding, and the decorative sheet is insert-molded on a surface portion of a molded product. In this molding method, the decorative sheet supplied between the molds in the opened state is softened by heating with a heating plate or the like, and then closely adhered to the cavity surface by evacuation from one of the molds. In this method, a molten resin is injected into the cavity by clamping the mold in that state. Further, by using a transfer sheet printed as a decorative sheet using such a method, it is also possible to transfer only the printed portion on the sheet to the surface of the molded article.

In the decorative molding method described above, when the decorative sheet, which has been softened by heating, is brought into close contact with the cavity surface of the mold by vacuum molding, the sheet is in contact with the mold. In deep drawing with a large time lag due to the close contact of the sheet with the mold,
There is a problem that the thickness of the sheet becomes uneven, for example, the sheet becomes thinner in a deep drawing portion where the contact of the sheet is delayed, and a desired pattern cannot be obtained.

The inventor of the present invention pre-stretches the decorative sheet in a softened state by pressing the decorative sheet after the heating step of the decorative sheet and before performing vacuum forming, thereby irrespective of the mold shape. A method has already been proposed in which the decorative sheet is brought into close contact with the mold cavity surface under a substantially uniform thickness.

[0005] The pre-stretching of the decorative sheet by pressing is as follows.
After heating the decorative sheet supplied between the molds in the mold open state by a heating plate or the like, the decorative sheet S is pressed by the pressing core 600 as shown in a schematic sectional view in FIG. This is performed by pressing one mold (female mold) 601 side. After this pre-stretching, the decorative sheet S is shaped along the cavity surface by vacuuming from the mold 601 side. The decorative sheet S adheres to the cavity surface with a substantially uniform thickness.

In this type of manufacturing apparatus, when the molded product is taken out of the apparatus, as shown in FIG.
A method is often used in which a molded product W attached to the other mold 602 is gripped by means such as suction using a molded product removal jig 603 inserted between the molds 01 and 602, and transferred out of the mold. Have been.

[0007]

By the way, in the conventional apparatus for manufacturing a decorative molded article as described above, the pre-stretching step of the decorative sheet and the removing step of the molded article in the mold opened state are respectively performed. Because it is necessary to use individual mechanisms and perform them individually in a predetermined order, not only is the mechanism complicated and the equipment becomes large, but also the time required for the mold opening state to occupy during the molding cycle is long. This is a major obstacle in shortening the molding cycle.

[0008] The present invention has been made in view of such circumstances, and reduces the molding cycle time with a simpler mechanism than that of this type of conventional apparatus. It is an object of the present invention to provide a decorative molding product manufacturing apparatus capable of manufacturing a decorative molded product.

[0009]

In order to achieve the above-mentioned object, a decorative molded article manufacturing apparatus according to the present invention comprises a pair of injection molds opposed to each other as shown in FIGS. Forming dies 14, 15; a sheet supply mechanism 30 for supplying a decorating sheet S between the dies 14, 15 in a mold-open state;
A press core 40 for pre-stretching by pressing to the side 4 is provided. The decorative sheet S is brought into close contact with the cavity surface of one of the molds 14 in advance, and then the mold is closed and the molten resin is injected into the cavity. Thus, in a device for manufacturing a decorative molded product in which the decorative sheet S is inserted into the surface or the transfer layer of the decorative sheet S is transferred to the surface of the molded product, the pressing core 40 and the mold opening A molded product removal jig 50 for removing the molded product W attached to the other mold 15 in the state is mounted on a common arm 60 that can be inserted and removed between the molds 14 and 15 in the mold open state. Characterized by

Here, in the decorative molded article manufacturing apparatus of the present invention, the pressing core 40 and the molded article removing jig 50 are integrated with each other in a direction opposite to each other (the integrated structure 6).
Together with 1), the integrated structure 61 is connected to the dies 14, 15
A moving mechanism (for example, an x-direction moving mechanism that moves the integrated structure 61 together with the arm 60) 65 for moving the mold in the mold clamping / opening direction is provided.
, And the operation of taking out the molded product W by the molded product removal jig 50 can be adopted.

According to the present invention, the pressing core 40 for pre-stretching the decorative sheet S and the molded product removal jig 50 for removing the molded product W are both provided in the mold 1 in the mold open state.
Attention is paid to the fact that they are inserted and removed between the molds 4 and 15, and these are mounted on a common arm 60 so that at least
By simultaneously performing the insertion / removal operation between 4 and 15, using a common mechanism, the mechanism is simplified and the molding cycle is shortened.

In addition, in the invention according to claim 2, the mold 1
The operations of the pressing core 40 and the molded product removal jig 50 in a state inserted between the molds 4 and 15 are both operations for approaching / separating from the mold 14 or 15, that is, the mold 1.
Focusing on the movement of the molds 4 and 15 in the mold clamping / mold opening direction, these two functional members are integrated, and the approach / separation operation with respect to the mold 14 or 15 is also performed using a common mechanism. By doing so, it is intended to further simplify the mechanism.

That is, in the invention according to claim 1,
The pressing core 40 and the molded product removal jig 50 are connected to a common arm 60.
By attaching to the molds, insertion and removal between the molds 14 and 15 in the mold opened state can be performed by one operation. The insertion / removal operation is substantially about 1 /
2, while simplifying the structure by sharing the mechanism.

In the invention according to the second aspect, the pressing core 40 and the molded article removing jig 50 are integrated in directions opposite to each other, and the entire integrated structure 61 is moved by the moving mechanism 6.
5, the pre-stretching of the decorative sheet S by the pressing core 40 and the removal of the molded product W from the mold 15 by the molded product removal jig 50 are common movements. This can be performed using the mechanism 65, and further simplification of the mechanism can be achieved.

Here, the pressing core 40 and the molded product removal jig 5
0 is integrated, the integrated structure 61 is clamped /
As a moving mechanism for moving in the mold opening direction, in addition to a mechanism for moving the integrated structure 61 together with the arm 60 as shown in FIG. 3 (x-direction moving mechanism 65), as shown in FIG.
A mechanism for moving the integrated structure 61 with respect to the arm 60 may be employed.

Further, in the invention according to claim 1, the pressing core 4
It is not always necessary to integrate the jig 50 with the molded product removal jig 50, and it is only necessary that these two functional members be mounted on the common arm 60. However, these two functional members are not integrated. In this case, a mechanism for moving at least one of the functional members with respect to the arm 60 in the mold clamping / mold opening direction may be provided (see FIG. 5).

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view (A) and a side view (B) showing a schematic overall configuration of a first embodiment of the present invention. This shows a heating state. FIG. 2 is a partial cross-sectional side view showing a configuration of a main part of the first embodiment, and shows a state where the arm 60 is lowered with the mold open.

The injection molding machine 10 is mainly composed of an injection device 11 and a mold moving mechanism 12.
The mold (male) 15 on the fixed side is mounted opposite to the mold (female) 14 mounted on the base. This fixed side mold 1
5, one end faces the cavity surface, and the other end is connected to the injection device 11 through a mounting plate 13 to a fixed die plate.
Is formed so that the molten resin supplied from the injection device 11 can be injected into the cavity formed by the dies 14 and 15 during mold clamping.

Above the movable mold 14, a roll 31 around which the decorating sheet S is wound and a sheet feeder 32 for rotating the roll 31 to feed the decorating sheet S are provided. A decorating sheet supply mechanism 30 is provided. The decorating sheet supply mechanism 30 is arranged so that the decorating sheet supply mechanism 30 is arranged so as to approach the cavity surface of the mold 14 in the mold open state in each molding cycle. At a constant pitch.

As shown in FIG. 2, a sheet clamp 10 which can be moved back and forth by a cylinder (not shown) is
1 and the decorative sheet supply mechanism 3 described above.
The decoration sheet S supplied at 0 is first clamped around the mold 14 by the sheet clamp 101. In this state, the sheet is heated by a sheet heating device 20 arranged adjacent to the injection molding machine 10.

As shown in FIG. 1, a sheet heating device 20 includes a heating plate 21 heated by driving a built-in heater or the like.
And a heating plate moving mechanism 22 for inserting the heating plate 21 between the molds 14 and 15 in the mold opened state and approaching the decorative sheet S in the clamped state.

The decorative sheet S heated by the heating plate 21 while being clamped to the mold 1 by the sheet clamp 101 is then pressed by the pressing core 40 into the mold 1.
After being pre-stretched by being pressed to the side 4, the vacuum device 1 passes through an air passage 102 formed in the mold 14.
By being evacuated by 00, it is shaped so as to be in close contact with the cavity surface of the mold 14.

The pressing core 40 for pre-stretching the decorative sheet S in the heat-softened state is provided with a molded product removal jig 50.
At the same time, it is attached to the tip of one vertical arm 60. That is, the pressing core 40 is fixed to one surface of the support plate 62 fixed to the distal end of the arm 60, and the molded product removal jig 50 is fixed to the back surface thereof. The structure 61 is constituted. Further, the pressing core 40 and the molded product removal jig 50
The respective central axes are coaxial with each other, and substantially coincide with the central axis of the molded product W attached to the mold 15.

The molded product removal jig 50 is a member for taking the molded product W adhered to the mold 15 in a state where the mold is opened after the injection molding and transporting the molded product W onto a product transport conveyor 70 disposed adjacent to the apparatus. A plurality of suction pads 51 connected to the vacuum device 100 by tubes or the like are used as main components, and the vacuum suction is performed while each suction pad 51 is pressed against the molding W, so that the molding W can be gripped. It has become.

The arm 60 moves in the mold clamping / opening direction (x direction) of the mold 14 by the mold moving mechanism 12, the direction perpendicular to the direction (y direction) on the horizontal plane, and the vertical direction (z direction). It is possible to do. That is, at the top of the vertical column 63 provided in the injection molding machine 10, a y-direction guide 64a extending in the y-direction and a y-direction moving mechanism 64 including a motor or a cylinder or other actuator built therein are provided. An x-direction guide 65a extending in the x-direction and an x-direction moving mechanism 65 including an actuator built therein are slidably supported by the y-direction guide 64a. Further, a z-direction guide 66a for slidably supporting the arm 60 in the z-direction and a z-direction moving mechanism 66 including an actuator built therein are slidably supported on the x-direction guide 65a.

Thus, by driving each of the moving mechanisms in the x, y, and z directions, the arm 60 is supported by the support plate 62, the pressing core 40, and the molded product removal jig 50 fixed to the end thereof.
And moves in an arbitrary direction in the x, y, and z directions together with the integrated structure 61 composed of

Next, the operation of the first embodiment during automatic operation will be described. After the decorative sheet S is brought into close contact with the cavity surface of the mold 14, the mold is clamped, and molten resin is injected into the cavity to perform injection molding with the decorative sheet S inserted. The molded product W obtained by opening the mold is in a state of being attached to the mold 15. In this state, the decorative sheet S is fed in close proximity to the mold 14 and is clamped by the sheet clamp 101 with respect to the mold 14. After that, the heating plate 21 is inserted between the molds 14 and 15 to heat and soften the decorative sheet S in the clamped state, and then the heating plate 21 is released, and then the arm 60 is driven by the z-direction moving mechanism 66.
Is lowered, and the integrated structure 61 is inserted between the molds 14 and 15 as shown in FIG.

In this state, the arm 60 moves toward the mold 14 by driving the x-direction moving mechanism 65, and as shown in FIG. 3A, the decorating sheet S is pressed by the pressing core 40 and pre-stretched. . After the completion of the pre-stretching, the decorative sheet S is shaped so as to be in close contact with the cavity surface of the mold 14 by suction through the air passage 102 formed in the mold 14.

At the same time, the arm 60 is moved toward the mold 15 by the driving of the x-direction moving mechanism 65 at the same time as the completion of the pre-stretching, and attaches the suction pads 51 of the molded article removing jig 50 to the mold 15. The molded article W is brought into contact with the surface of the molded article W, and the molded article W is gripped by evacuation in the contact state. Then, by moving the arm 60 toward the mold 14 by driving the x-direction moving mechanism 65, the molded product W gripped by the molded product removal jig 50 is moved to the mold 15 as shown in FIG. Then, the arm 60 is moved to a position above the product transport belt 70 by driving the y-direction moving mechanism 64, and the vacuum evacuation through the suction pads 51 of the molded product removal jig 50 is released to remove the molded product W. Product conveyor belt 70
Drop it up. Thereafter, the z-direction moving mechanism 66 and y
By driving the direction moving mechanism 64, the arm 60 moves up and returns to the position immediately above the molds 14 and 15, which is the origin position.

In the above-described molded product removal process, the arm 60
Of the mold 1 in the y direction
Immediately after the molds 14 and 15 are separated from each other, the molds 14 and 15 are clamped, the molten resin from the injection device 11 is injected into the cavities, and the decorative sheet S is inserted into the surface of the molded product. Is performed. Then, after opening the mold, the same steps as above are repeated.

In the operation of the first embodiment, it should be particularly noted that the pre-stretching operation of the decorative sheet S supplied between the dies 14 and 15 by the pressing core 40 after the mold is opened, and the forming operation. The operation of taking out the article W is performed by one arm 60.
Is performed in a state in which the mold is inserted between the molds 14 and 15, whereby each process executed in the mold open state is performed.
In other words, the total time of the heating step of the decorative sheet S, the pre-stretching step of the sheet S, and the molded article removing step is such that the pressing core 40 and the molded article removing jig 50 are alternately moved between the dies by the individual arms. This is greatly reduced as compared with a conventional device that inserts and sequentially performs individual operations.

Further, what should be noted in the first embodiment is that the pressing core 40 and the molded product removing jig 50
And an x-direction moving mechanism 65 for fixing the integrated structure 61 to the arm 60 and moving the arm 60 in the mold clamping / mold opening direction. The movement for the pressing of the decorative sheet S by the pressing core 40 and the molded product removal jig 5
In this case, both the movement for taking out (separating) the molded article W from the mold 15 by using the moving mechanism 0 is performed, so that one moving mechanism can also be used for the operation of two functional members. It is possible and the device is simplified.

Here, the pressing core 40 and the molded product removal jig 5
In the case of integrating the 0, the mechanism for moving the integrated structure 61 is to move the arm 60 as described above, and as shown in FIG. A guide 401 along the x direction at the tip of the arm 60
And a pressing core 40 and a molded product removal jig 50
The same effect can be achieved by providing a structure in which an actuator 403 is provided for moving the supporting member 402 with the front and back surfaces along the guide 401. In the second embodiment, the x-direction moving mechanism 65 in the first embodiment for moving the arm 60 in the x direction does not need to be provided.

Further, the pressing core 40 and the molded product removing jig 50
Need not necessarily be integrated, and one of them may be configured to move in the x direction at the tip of the arm 60. That is, as shown in FIG. 5, the main part configuration of the third embodiment of the present invention, a molded product removal jig 50 is provided on one surface of a support body 501 fixed to a tip end of an arm 60.
Is fixed, and an actuator 502 such as a cylinder or an electric motor is fixed to the back surface thereof, and the pressing core 40 that is displaced in the x direction with respect to the support body 501 by the actuator 502 is adopted. be able to. In the third embodiment, although an actuator for moving the pressing core 40 in the x direction is required, these members are used for the mold 14,
The effect of simplification of the mechanism by sharing the arm for insertion / removal between the members 15 can be obtained, and the effect of shortening the molding cycle can be made equal to each of the above examples. The moving mechanism for moving the pressing core 40 in the x direction at the tip of the arm 60 is provided with a dedicated actuator by taking measures such as synchronizing the operation of each part of the injection molding machine 10, for example, the operation of ejecting a molded product. It is also possible to adopt a configuration in which a mechanism is used to cope with the problem without providing.

Table 1 shows the first to third aspects of the present invention.
And the conventional apparatus in which the pressing core and the molded article removing jig are mounted on individual arms and inserted alternately between a pair of dies to sequentially perform individual operations, and are executed in a mold open state. It summarizes the measured values of the required time of each process.

[0036]

[Table 1]

As is apparent from this table, even when the injection molding conditions and the like are the same, according to each embodiment of the present invention, the total time of each step performed in the mold open state is shorter than that of the conventional apparatus. It was confirmed that it was possible to reduce the time for 9 to 10 seconds, and to exert a great effect on shortening the molding cycle of the decorative molded product using the decorative sheet.

In each of the above embodiments, the example in which the pressing core 40 and the molded article removing jig 50 are arranged coaxially opposite to each other has been described. The configuration is not limited to a simple arrangement, and the pressing core 40 and the molded product removal jig 50 are opposed to each other, but are not arranged coaxially, and are arranged at positions shifted vertically or horizontally, and further, do not conflict with each other For example, a configuration in which the members are arranged at an angle of 90 degrees, that is, a configuration in which the other member is arranged on one side surface can be adopted. However, in these cases, the arm is moved up and down or left and right between the pre-stretching step of the decorative sheet by the pressing core 40 and the molded article removing step, or the arm is rotated between these two steps. It has to be moved, which is not very good.

In each of the above embodiments, the case where the decorative sheet is inserted on the surface of the molded article has been described. However, the decorative sheet is used as the transfer sheet, and the printed sheet is printed on one side of the sheet. Of course, the present invention can equally be applied to the case where a layer is transferred to the surface of a molded article.

[0040]

As described above, according to the present invention, one pressing core for pre-stretching the decorative sheet and one jig for removing the molded product adhered to the mold after the completion of molding are provided. Are mounted on a common arm, and the two arms are inserted / removed between the pair of molds by the arm, so that these two functional members are inserted / removed between the molds. Thus, the mechanism can be simplified and the time required for inserting / removing the two members between the dies can be reduced at once.

Further, a mechanism is provided for integrally mounting the pressing core and the molded article removing jig on the arm, and for moving the integrated structure in the mold clamping / mold opening direction. Pressing operation of the decorative sheet by the core,
If it is configured to be used for both the operation of removing the molded product by the molded product removal jig, the effect of simplifying the mechanism is further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the overall configuration of a first embodiment of the present invention, and is a plan view (A) and a side view (B) showing a state in which a decorative sheet S is heated by a heating plate 21.

FIG. 2 is a partial cross-sectional side view showing a configuration of a main part of the first embodiment in a state where an arm 60 is lowered in a mold open state.

FIG. 3 is an operation explanatory diagram of the first embodiment of the present invention.

FIG. 4 is a side view showing a main part configuration of a second embodiment of the present invention.

FIG. 5 is a side view showing a configuration of a main part of a third embodiment of the present invention.

FIG. 6 is a partial cross-sectional side view showing a decorative sheet pre-stretching step (A) and a molded article removing step (B) in a conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Injection apparatus 12 Die moving mechanism 13 Attachment plate to fixed die plate 14 Die (movable side, female type) 15 Die (fixed side, male type) 20 Sheet heating device 21 Heating plate 30 Decorating Sheet feeding mechanism 40 Pressing core 50 Mold removal jig 51 Suction pad 60 Arm 61 Integrated structure 62 Support plate 63 Vertical column 64 Y direction moving mechanism 65 X direction moving mechanism 66 Z direction moving mechanism 70 Product transport belt 100 Vacuum Apparatus 101 Sheet clamp 102 Air passage S Decorative sheet W Molded product

Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29K 105: 20 B29L 9:00

Claims (2)

[Claims] 1. A pair of injection molding dies facing each other, a sheet supply mechanism for supplying a decorative sheet between the pair of injection molding dies while the molds are open, and a sheet supply mechanism for supplying the supplied sheet to one of the dies. Equipped with a pressing core for pressing and pre-stretching to the cavity side of the mold, and holding the pre-stretched decorative sheet in close contact with the cavity surface of one of the molds, clamping the mold and melting the molten resin into the cavity. By injecting, the decorative sheet is inserted into the surface, or, in a device for manufacturing a decorative molded product obtained by transferring the transfer layer of the decorative sheet to the molded product surface, the pressing core, A molded product removal jig for removing a molded product adhered to the other mold in the mold opened state is mounted on a common arm that can be inserted and removed between the molds in the mold opened state. Equipment for manufacturing decorative molded products. 2. The pressing core and the molded product removal jig are integrated with each other in a direction opposite to each other, and the integrated structure is moved in a mold clamping / mold opening direction of the pair of molds. A moving mechanism for performing the pressing operation of the decorative sheet by the pressing core and the removing operation of the molded product by the molded product removal jig. An apparatus for manufacturing a decorative molded product according to claim 1.