JP2001105451A - Apparatus for producing decorative molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the apparatus capable of correcting a decorative sheet to a proper position when the decorative sheet is shifted with respect to the cavity of a movable mold. SOLUTION: In a decorative molded article manufacturing apparatus wherein a decorative sheet S is supplied to the gap between a fixed mold 2 and a movable mold 1 by a sheet feeder 3 and softened under heating in a state clamped to the movable mold 1 to be brought into close contact with the cavity surface of the movable mold 1 under vacuum and a molten resin is supplied to the mold cavity to mold a decorative molded article, a receiving chuck 13 is provided so as to be moved freely up and down/left and right with respect to the movable mold 1 by a drive means 14. The receiving chuck 13 is moved on the basis of the detection result of a detection means 18 for detecting the shift in an up and down/left and right direction of the decorative sheet by the drive means 14 to positionally correct the decorative sheet S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet for manufacturing a decorative molded article obtained by integrally molding a decorative sheet on which decorative prints such as characters and pictures are printed with a molten resin. The present invention relates to an apparatus for manufacturing a molded article.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for manufacturing a decorative molded article,
For example, as can be seen in Japanese Patent Publication No. 50-19132, a decorative sheet of a thermoplastic synthetic resin with a paint or the like is supplied between a fixed mold and a movable mold, and this decorative sheet is After clamping the movable mold in a closed state with a sheet clamp device and heating and softening it by heating means in this state, perform the so-called preforming, which is to suction-adhere the decorative sheet to the movable mold by vacuum forming method, Then, a mold is closed, and a molten resin is injected and filled into the cavity to obtain a decorative molded product of a synthetic resin having a painted surface.

[0003]

However, in the above-mentioned conventional apparatus for manufacturing a decorative molded product, when the sheet clamping device clamps the decorative sheet supplied from above, the decorative sheet is moved relative to the movable mold. Therefore, even if the position of the decorative sheet is shifted in the left-right or up-down direction with respect to the movable mold cavity, it is very difficult to correct the shift. Therefore, conventionally, a decorative sheet of a continuous pattern,
Alternatively, molding can only be performed using a sheet that can be applied even if there is some deviation such as a plain sheet.

[0004] An object of the present invention is to correct the deviation to an appropriate position when the decorative sheet is displaced with respect to the cavity of the movable die during the supply of the decorative sheet to the movable die in the decorative molding. It is an object of the present invention to provide an apparatus for manufacturing a decorative molded product that can be used.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for manufacturing a decorative molded article, comprising a fixed mold and a movable mold in which a cavity corresponding to the shape of the molded article is formed. The decorative sheet is supplied between the fixed mold and the movable mold by the sheet supply device provided in the above, and the lower end portion of the decorative sheet is gripped by the receiving chuck provided below the movable mold, and the sheet is placed on the movable mold. After heating and softening in a clamped state, it is brought into close contact with the cavity surface of the movable mold by vacuum suction, then the mold is closed and the molten resin is supplied into the cavity to form a decorative molded product. In manufacturing equipment,
The receiving chuck is provided so as to be movable vertically and horizontally with respect to the movable mold by a driving means.

According to a second aspect of the present invention, there is provided the apparatus for manufacturing a decorative molded product, wherein a detecting means for detecting a deviation of the supplied decorative sheet in the vertical and horizontal directions with respect to the movable mold is provided on the movable mold side. The receiving means is moved by the driving means based on the detection result by the detecting means, and the vertical and horizontal displacement of the decorative sheet is corrected.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an apparatus for producing a decorative molded product according to the present invention. Movable mold 1 and fixed mold 2 facing each other
The movable die 1 is fixedly mounted on a moving platen of an injection molding apparatus via a mounting plate 10, and the fixed die 2 is mounted on a mounting plate 2.
The movable mold 1 is fixed to the fixed platen of the injection molding apparatus via a fixed mold 2 and can be freely clamped and opened with respect to the fixed mold 2. The injection filling of the molten resin into the cavity formed by the movable mold 1 and the fixed mold 2 in the mold-clamped state is as follows.
This is performed through the sprue portion 21 and the gate portion 22 formed on the fixed mold 2 on the fixed side.

A sheet feeding device 3 is provided above the movable mold 1. As shown in FIG. 2, the sheet feeding device 3 includes a sheet roll 31 around which the decorative sheet S is wound, and a sheet sending roll 32 which sends the decorative sheet S downward from the sheet roll 31 by a constant pitch. Have. Each time the injection molding is completed and the mold is opened in the mold-clamped state, the sheet supply device 3 supplies the decorative sheet S of a required length in proximity to the movable mold 1.

The movable mold 1 is provided with a frame-shaped sheet clamp device 11 which is moved in the left-right direction in FIG. 1 by a cylinder (not shown). The decorated sheet S is clamped by being clamped by the sheet clamping device 11 with respect to a peripheral portion of the parting surface of the movable mold 1.

The movable die 1 is provided with an air passage 12 communicating with a vacuum device (not shown) for vacuum forming the decorative sheet S. The decorative sheet S in the clamped state is cut by the cutter 33.

Further, below the movable mold 1, there is provided a receiving chuck 13 for grasping the lower end of the decorative sheet S supplied close to the movable mold 1. This receiving chuck 13
Is configured such that the front and rear grip portions 13a can be freely opened and closed,
The grip 13a is closed to grip the lower end of the decorative sheet S, and as shown in FIGS. 1 and 2, the driving means 14 provided below the movable die 1 moves the movable die 2 left and right and up and down. It is provided movably.

As shown in FIG. 3, the driving means 14 is provided with an up-down driving device 15 for moving the receiving chuck 13 in the vertical direction with respect to the movable die 1 and the receiving chuck 13 integrally. A left and right driving device 16 for moving the movable mold 1 in the left and right direction.

The vertical drive device 15 is vertically movably guided by one of a pair of left and right vertical guide rods 151, 151 vertically provided on the lower surface of the movable mold 1, and the other vertical guide rod 151. The follower 17 is movably arranged while being guided by the vertical guide rod 151.

A horizontal guide rod 161 is provided between the vertical drive device 15 and the follower 17, and the left and right drive device 16 is movably arranged while being guided by the horizontal guide rod 161. .

As a drive source of the vertical drive device 15, for example, an electric motor (not shown) built in or external to the vertical drive device 15 is used, and an appropriate moving mechanism is provided by rotating the electric motor in forward and reverse directions. The vertical drive device 15 can be moved up and down through the control unit.

As the moving mechanism, a conventionally known mechanism such as a mechanism using a rack and a pinion or a mechanism using a ball screw is used. In such a mechanism, a rack or a screw rod is used also as a vertical guide rod 151. Is also good.
Therefore, by rotating the pinion and the female screw portion and the like in the forward and reverse directions by the electric motor, the vertical drive device 15 moves up and down by this moving mechanism, and is connected to the vertical drive device 15 via the left and right drive device 16. The received chuck 13 moves vertically with respect to the movable mold 1.

An electric motor is also used as a drive source of the left and right driving device 16. By rotating the electric motor in the forward and reverse directions, a receiving chuck integrally provided by a moving mechanism similar to the above-described vertical driving device 15 is provided. 13 moves in the left-right direction with respect to the movable mold 1.

It is preferable that the follower 17 be provided with an appropriate tuning mechanism so as to move up and down in synchronization with the up and down movement of the up and down driving device 15.

Further, the movable die 1 is provided with a sheet feeding device 3.
A position detection sensor 18 is provided as detection means for detecting vertical and horizontal deviation of the decorative sheet S supplied from the printer.

A pair of left and right position detecting sensors 18 are arranged at the lower end of the movable mold 1 on the parting surface side. For example, an optical sensor having a function of detecting light transmittance or a color sensor capable of distinguishing colors is provided. Is used. In order to detect the vertical and horizontal deviation of the decorative sheet S by the position detection sensor 18, for example, a mark such as a black mark is formed in advance on both left and right ends of the decorative sheet S in accordance with the pitch of the pattern of the decorative sheet S. The position of the mark is detected by a position detection sensor 18 by printing or the like, and the position of the mark from the reference position up, down, left and right is detected. For example, in the case of using the above-described optical sensor, a sensor having a plurality of pixels (for example, four pixels on the left, right, top, and bottom) corresponding to the size of the mark is used, and the transmittance of light detected by each pixel is compared to determine the reference position It is possible to detect how much the image is displaced up, down, left and right from the center position.

Therefore, based on the detection result detected by the position detection sensor 18, the above-described vertical driving device 15 and the horizontal driving device 16 are driven to move the receiving chuck 13 in the vertical and horizontal directions. It is possible to correct the deviation of the decorative sheet S grasped at 13 to an appropriate position.

When the receiving chuck 13 is moved up and down by the vertical driving device 15, it is necessary to move the sheet delivery roll 32 of the sheet feeding device 3 in synchronization with the movement of the receiving chuck 13.

Further, the movable mold 1 and the fixed mold 2 in the mold opened state
An arm drive mechanism 61 is disposed above the space therebetween.
The arm drive mechanism 61 vertically moves the vertical arm 6.

A support plate 60 is fixed to the tip of the arm 6, and the flat plate-like heating plate 4 and the support plate 60 are attached to the support plate 60.
The pressing core 5 and a driving mechanism 51 for driving the pressing core 5 are supported.

The pressing core 5 is driven forward by a core driving mechanism 51 to the left in the drawing.

Each of the heating plate 4 and the pressing core 5 has a cartridge heater embedded therein. By driving the built-in cartridge heater, the heating plate 4 and the pressing core 5 are heated to a predetermined temperature. Is done.

The arm driving mechanism 61 includes a state in which the arm 6 is lowered so that the heating plate 4 faces the decorative sheet S clamped to the movable mold 1 as shown in FIG. The arm 6 is lowered by a predetermined amount and the pressing core 5 is opposed to the decorative sheet S (not shown), and these members are detached upward from between the movable mold 1 and the fixed mold 2. It is possible to adopt three states, that is, a state (not shown).

That is, in the heating step, as shown in FIG. 1, the heating plate 4 is made to face the decorative sheet S in the clamped state, and after the heating is completed, the arm 6 is lowered by a predetermined amount to decorate the sheet. After the pressing core 5 is made to face the sheet S, the pressing core 5 is advanced by driving the core driving mechanism 51, and the decorative sheet S is pre-stretched.

After the completion of the preliminary stretching, the decorative sheet S
Is vacuum-formed and the arm 6 is raised to
Then, the pressing core 5 and its attached members are separated from the movable mold 1 and the fixed mold 2, and after the mold is clamped, a molten resin is injected and filled into the cavity. Next, the operation of the thus-constructed decorative molded article manufacturing apparatus will be described. First, with the movable mold 1 and the fixed mold 2 opened, the decorative sheet S is supplied close to the parting surface of the movable mold 1 by the sheet supply mechanism 3, and the lower end of the decorative sheet S is received by the receiving chuck 13. Grab the part. When the decorating sheet S is gripped by the receiving chuck 13, the position detection sensor 18 detects how much the mark printed on the decorating sheet S has shifted from the proper position (reference position) vertically and horizontally.

Next, based on the above detection results, for example,
First, if the decorative sheet S is vertically displaced,
The vertical driving device 15 is driven to move the receiving chuck 13 up and down by an amount corresponding to the deviation, and the sheet sending roller 32 is moved up and down in synchronization with the vertical movement,
The decorative sheet S is arranged at an appropriate position in the vertical direction. Subsequently, when the decorative sheet S is displaced in the left-right direction, the right and left driving device 16 is driven to move the receiving chuck 13 left and right by the displacement, and the decorative sheet S is moved to the appropriate position in the left-right direction. To place.

The position correction of the decorative sheet S in the left-right direction by the movement of the receiving chuck 13 in the left-right direction is a movement on the circumference with the upper sheet sending roll 32 as a fulcrum. Since the distance is very short as compared with the distance between the receiving chuck 13 and the sheet sending roll 32, there is no adverse effect on the decorative sheet S, and this correction can be used as the horizontal position correction.

The position correction of the decorative sheet S in the left-right direction may be performed first, and then the position correction in the vertical direction may be performed.

After the position of the decorative sheet S is corrected in this way, the decorative sheet S is clamped to the movable mold 1 by the sheet clamp 11, and the arm 6 is driven by the arm driving mechanism 61 to move the arm 6 to the movable mold 1. It falls between 2. In this state, the pressing core 5 is retracted as shown in FIG. 1 and the heating plate 4 heated by the cartridge heater is brought into a facing state in which the heating plate 4 approaches the decorative sheet S, and the decorative sheet S is heated by the radiant heat. In a softened state.

After the heating step is completed, the arm 6 is further lowered, and the pressing core 5 faces the decorative sheet S. After that, the pressing core 5 advances by the driving of the core driving mechanism 51, and The decorative sheet S clamped and softened by heating is pressed against the movable mold 1 and preliminarily stretched.

After the completion of the pre-stretching, the decorative sheet S is vacuum-formed so as to be in close contact with the cavity surface of the movable mold 1 by evacuating through the air passage 12 formed in the movable mold 1. During this vacuum forming, the pressing core 5 is retracted by the driving of the core driving mechanism 51, and the arm 6 is raised by the driving of the arm driving mechanism 61, so that the heating plate 4 and the pressing core 5 and their attached mechanisms are movable. 1 is separated from the fixed mold 2.

After the release, the movable mold 1 and the fixed mold 2 are clamped, and a molten resin is injected and filled into a cavity formed between the movable mold 1 and the fixed mold 2 so that the decorative sheet S is partially provided on the surface.
Can be obtained.

[0038]

Next, when each of the above-described decorative molded article manufacturing apparatus of the present invention and a conventional decorative molded article manufacturing apparatus were molded, the respective decorative molded articles were formed. The degree of positional accuracy of the decorative sheet S is compared.

The decorative sheet S is made of polymethyl methacrylate (PMMA), and has a thickness of 0.1 mm and a 1 mm square pattern printed thereon.

As the resin, acrylonitrile butadiene styrene copolymer resin (ABS) was used, and both were molded under the same molding conditions.

In the case of the present invention, the decorative sheet S is a black perfect circle mark 2 mm in diameter at a position 20 mm inward from the left and right ends of the decorative sheet S in accordance with the pitch of the pattern. Was printed, and a position detection sensor that detects light transmittance was used.

Table 1 shows that each of the apparatus for manufacturing a decorative molded article of the present invention and the conventional apparatus for manufacturing a decorative molded article has a continuous
It shows the result of comparing the displacement of the decorative sheet S in the left-right and up-down directions with respect to the decorative molded product when the 00 shot is formed.

[0043]

[Table 1]

According to the results shown in Table 1, while the decorative sheet S of the decorative molded article formed by the apparatus for manufacturing a decorative molded article of the present invention has almost no deviation, the conventional decorative molded article Sheet S for decorative products molded by the manufacturing equipment
The deviation was very large.

In this embodiment, the electric motor is used as the driving source of the driving means 14. However, the receiving chuck 13 is moved vertically and horizontally with respect to the movable mold 1 by using an air cylinder or a hydraulic cylinder as a driving source. It may be configured to move.

If it is particularly necessary to perform highly accurate position correction, a servomotor may be used as an electric motor.

[0047]

As described above, according to the apparatus for manufacturing a decorative molded product of the present invention, the receiving chuck is provided so as to be movable vertically and horizontally with respect to the movable mold by the driving means. If the decorative sheet is displaced up and down and left and right with respect to the mold, this displacement can be corrected by moving the receiving chuck in the up and down and left and right directions by the amount of the displacement. Decorative molded articles can be continuously formed. This makes it possible to perform decorative molding using a decorative sheet on which a spot-like pattern, logo, or the like is drawn, which has been difficult in the past, and it is possible to reduce printing and emblem sticking to a molded product performed in the secondary processing step. At the same time, the added value of the molded article can be increased.

Further, the receiving chuck is moved by the driving means based on the detection result of the detecting means, and the vertical and horizontal displacements of the decorative sheet are corrected in position so that the decorative sheet is hardly displaced. The product can be continuously and automatically molded, and can be manufactured efficiently.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a decorative sheet manufacturing apparatus of the present invention.

FIG. 2 is a perspective view showing a configuration of a receiving chuck provided above and below a movable mold and a sheet feeding device.

FIG. 3 is a side view showing a driving means of the receiving chuck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable type 13 Receiving chuck 14 Driving means 15 Vertical driving device 16 Left and right driving device 18 Position detection sensor (detecting means) 2 Fixed type 3 Sheet feeding device S Decorative sheet

Claims (2)

[Claims] 1. A fixed mold having a cavity corresponding to the shape of a molded article and a movable mold, and a decorative sheet is placed between the fixed mold and the movable mold by a sheet feeding device provided above the movable mold. After the lower end of the decorative sheet is gripped by the receiving chuck provided below the movable mold, the sheet is clamped to the movable mold and heated and softened, and then closely attached to the cavity surface of the movable mold by vacuum suction. In the decorative molded article manufacturing apparatus for molding a decorative molded article by clamping the mold and then supplying the molten resin into the cavity, the receiving chuck is driven up and down and left and right with respect to the movable mold. An apparatus for manufacturing a decorative molded product, which is provided so as to be freely movable. 2. A detecting means for detecting a deviation of the supplied decorative sheet in the vertical and horizontal directions with respect to the movable mold is provided on the movable mold side, and the driving is performed based on a detection result by the detecting means. 2. The apparatus for manufacturing a decorative molded product according to claim 1, wherein the receiving chuck is moved by means to correct the vertical and horizontal displacement of the decorative sheet.