JP2000301566A - Method and apparatus for simultaneously injection molding and decorating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost of an apparatus, to shorten a molding cycle time and to improve productivity by bringing one shot of a lengthy band-like decorating sheet from an unwinder into close contact with a parting surface of a female mold, fixedly holding the sheet at a clamp, clamping the mold, casting resin in a cavity to integrate the resin with the sheet, and executing removing of a laminate and supplying of the sheet in parallel. SOLUTION: An end of a decorating sheet S from an unwinder 50 is grasped by a fixed chuck 54, and one shot of the sheet S is supplied onto a parting surface 14 of a female mold 12 by a conveying chuck 57. The sheet S is fixedly held by a clamper 20, and cut to sheets S for the shot by a cutting blade 65 at an end of a piston rod 62 of a cutting air cylinder 62. The sheet S is heated, softened by a hot platen, sucked by a vacuum suction hole 15, and the sheet S is stretched and brought into close contact with a female mold cavity. After a male mold 30 and the mold 12 are clamped, the resin of a flowing state is cast in the mold, laminated as the sheet S, integrated, then the mold is opened, a molding is removed, and sheet is supplied simultaneously in parallel. Thus, a cost of the apparatus is suppressed, a molding cycle time is shortened, and productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative laminated product (product) in which a painted sheet on which a pattern, a character or the like is applied in a mold at the same time as injection molding is integrally adhered and laminated on the surface of an injection resin molded product.
The present invention relates to an injection molding simultaneous painting apparatus which obtains the following.

[0002]

2. Description of the Related Art There have been proposed several methods for simultaneous injection molding and painting in which a painting sheet is integrally laminated and adhered to the surface of an injection resin molding at the same time as injection molding. Is to replace all or some of the following steps (a) to (i) in the order described or by changing the order,
Sequentially, or a plurality of steps are performed simultaneously or in parallel or in parallel (Japanese Patent Publication No. 50-19132,
See Japanese Utility Model Publication No. 3-56344 and Japanese Patent Publication No. 7-41637.

(A) A sheet supply step of supplying a picture sheet onto a female parting surface used for injection molding. (B) a clamping step of fixing and holding the painted sheet on the female parting surface; (C) A heating softening step of heating and softening the painted sheet with a hot platen or the like. (D) A stretching step (preliminary molding step) of stretching the painted sheet along the female cavity by vacuum suction and / or air supply.

(E) A mold clamping step in which one of the female mold and the male mold (usually a female mold) is moved to the other (usually a male mold) to perform mold clamping. (F) An injection molding step of injecting and filling a resin (molten resin) in a flowing state from the male mold side into a cavity formed between the female mold and the male mold to perform injection molding. (G) A mold opening step of separating the female mold and the male mold. (H) A sheet trimming step of separating a portion of the painted sheet to be attached to the injection resin molded body from another portion (excess portion).

[0005] (i) A molded article removing step of taking out a laminated molded article on which a picture sheet is adhered and laminated from a female mold or a male mold and transporting the molded article outside. Simultaneously overlapping a plurality of steps means that a plurality of steps are included in one step. For example, in the mold clamping step (e), a painted sheet is placed between a female mold and a male mold. If it is not fixed and held, it means that the clamping step (b) is performed simultaneously with the mold clamping step, and the painted sheet is injected in the injection molding step (f). If the stretching is performed by the heat and pressure of the molten resin, this means that the stretching step (d) is performed simultaneously with the injection molding step.

[0006] As the painting sheet, either a laminated sheet (laminated sheet) or a transfer sheet is used depending on the product type. In the case of a laminated sheet, painting is performed as it is by injection molding. That is, all the layers of the sheet are bonded and integrated with the surface of the injection resin molded body to form a decorative layer. On the other hand, when the painting sheet is a transfer sheet, the support sheet of the painting sheet integrated with the surface of the injection resin molded body is peeled off, and only the transfer layer such as the decoration layer remains on the injection resin molding body side. Then, the painting is completed by forming a decorative layer.

[0007]

However, in performing the simultaneous painting by injection molding as described above, a sheet supplying step of supplying a painted sheet to the female parting surface every shot (molding) is essential. In an injection molding simultaneous painting apparatus that performs simultaneous injection molding painting, usually, a long strip-shaped painting sheet (sheet roll) wound up in a roll shape is sequentially unwound one shot at a time from the front end side, and this unwinding is performed. Sheet supply means is provided for conveying one shot of the painted sheet on the leading end side onto the female parting surface. The sheet supply means can be roughly classified into two types depending on the transport system.

One of them is disclosed, for example, in JP-A-60-212.
As can be seen in Japanese Patent Publication No. 314 and Japanese Utility Model Publication No. 1-1185, etc., one shot of a long strip-shaped painted sheet wound in a roll shape is unwound from an upstream of a female die by an unwinder. It employs an unwinding winding system (roll / roll system) in which a winding machine winds the downstream side of the mold, and the other is a transfer chuck as disclosed in, for example, JP-A-6-315950. The transport chuck is used to grip the front end of the painted sheet unwound from the unwinder near the upstream end when viewed in the transport direction of the painted sheet in the female mold, and to grip the downstream end of the female mold. In this state, the painted sheet is pressed onto the female parting surface by the clamping means and fixed and held, and then,
This is a transport chuck system in which a sheet with a picture is cut in the width direction on the upstream side of the clamping means to form a single sheet.

The above-described roll / roll type sheet supply means is suitable when the painting sheet is a transfer sheet. That is, as described above, when the painted sheet is a transfer sheet, the support sheet of the painted sheet integrated with the surface of the injection resin molded body is peeled, and the peeled support sheet is formed into a female mold. By winding with a winder on the downstream side, the next shot is supplied onto the female parting surface, and at the same time, unnecessary support sheets are removed outside the female mold, which is reasonable. is there.

However, in the roll / roll system, when the painted sheet is a laminated laminated sheet (laminated sheet), the painted sheet and the injection resin molded body are integrated with each other. Can not be wound up. Therefore, when a laminated sheet as a painted sheet is supplied by a roll / roll method, only a portion to be bonded and attached to the injection resin molded body is cut out from the painted sheet, and the painted sheet which is cut out and has an opening is downstream. It has been proposed to wind up on the side, but in this case, a hollowing-out process is required,
It cannot be said that production efficiency is good.

For this reason, when the painting sheet is a laminate sheet, usually, a sheet feeding means employing the above-mentioned transport chuck system is used. However, in the case of using the sheet feeding means of the conveyance chuck type, the sheet is driven out of the unwinding machine by a sheet conveyance driving means such as a fluid pressure cylinder for reciprocating the conveyance chuck in a direction along the female parting surface. A fixing chuck for temporarily holding and fixing the painted sheet, a cutting means for cutting the painted sheet in the width direction to form a single-sheet sheet, and the like, and a lamination in which the painted sheet is adhesively laminated. It is necessary to have a means for taking out the molded article (usually separated from the female mold in a state where the molded article is attached to the male mold in the mold opening process) from the male mold and transport it to the outside. Was.

Further, since the step of taking out the laminated molded product from the male mold by the molded product taking-out means and transporting it to the outside is the final step of the molding cycle, it is simultaneously performed with the next shot by the transport chuck during this process. If the supply of the painting sheet is performed, the time required for one molding cycle is substantially reduced by that amount, and the productivity is improved.However, at the time of the unloading step, the transfer chuck or the like is placed in a narrow space between the male and female molds. If a sheet conveying drive unit or the like is inserted, there is a risk of interfering with the molded product taking out unit. Therefore, conventionally, it was not possible to proceed to the next shot molding cycle until after the taking out step was completed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to reduce the cost of the apparatus as much as possible and to substantially reduce the time required for one molding cycle. It is an object of the present invention to provide a method and apparatus for simultaneous painting by injection molding, which can shorten the time and improve the productivity.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, an injection-molding simultaneous painting method according to the present invention is characterized in that a leading end portion of a long strip-shaped painting sheet unwound from an unwinder is gripped by a transport chuck. A sheet supplying step of supplying one shot to the female parting surface, a clamping step of fixing and holding the painted sheet on the female parting surface by clamping means, A stretching step of extending the mold so as to adhere along the parting surface of the mold, and clamping the mold by moving one of the female mold and the male mold to the other side to form a cavity between both molds. A step of injecting and filling a resin in a fluid state into the cavity, laminating and integrating the obtained injection resin molded body and the painted sheet, and a mold for separating the female mold and the male mold Opening process The molded article taking-out means adapted to be moved in and out between the female mold and the male mold with the transfer chuck, in parallel with a sheet supply step of a painted sheet for the next shot, It is characterized in that a take-out step of picking up the laminated molded product on which the sheets are bonded and laminated from the male mold and transporting the same to the outside is performed. In a preferred aspect of the present invention, after the clamping step, the painted sheet unwound from the unwinder is cut into one-shot sheets one shot upstream of the clamping means.

[0015] The injection molding simultaneous painting apparatus according to the present invention comprises a female die and a male die which are arranged to face each other so that one can be moved to the other side, an unwinder and a transport chuck. And gripping the leading end of the long strip-shaped painted sheet unwound from the unwinder with the transport chuck.
Sheet supply means for supplying a shot portion on the female parting surface, and movable in a direction orthogonal to the female parting surface, and the painted sheet is attached to the female parting surface. Clamping means for pressing and holding, vacuum suction means for extending the painted sheet along the female mold cavity, and the male mold side in a cavity formed between the female mold and the male mold. A resin injection means for injecting and filling a resin in a fluid state from the female mold and the male mold together with the transport chuck, and the laminated molded product on which the painted sheet is adhesively laminated is formed. And a molded product taking-out means for picking up from the male mold and transporting the molded product to the outside.

In a preferred aspect of the apparatus of the present invention, the conveyance chuck of the sheet supply means is along the parting surface of the female mold by a driving means for taking out a molded product such as a fluid pressure cylinder provided in the taking out product. Reciprocating in the direction. In another preferred aspect, the molded product take-out means includes a holder such as a suction cup or a magic hand that holds the laminated molded product, and a holder that is close to or separated from the female mold or the male mold. Holding means for driving to move. Further, in another preferred aspect, in the female mold, near the upstream end when viewed in the sheet supply direction, a fixed chuck for gripping the painted sheet, and sheet cutting means for cutting the painted sheet in the width direction, Is arranged.

In a preferred aspect of the method and apparatus for simultaneous painting by injection molding according to the present invention having the above-described structure, the sheet supply is performed by a driving means for taking out a molded product such as a fluid pressure cylinder provided in the taking out product. A transport chuck of means is mounted. In other words, the driving means for sheet conveyance and the driving means for removing the molded product are shared, and the transport chuck is along the parting surface of the female mold together with the holder such as the suction cup provided in the molded product removing means. The molding product removal process in the current molding cycle and the sheet supply process in the next molding cycle are performed simultaneously in parallel.

That is, in this molding cycle,
At the point of passing the sheet supply step, the clamping step, the stretching step, the mold clamping step, the injection molding step, and the mold opening step, the laminated molded product on which the painting sheet is adhesively laminated is usually a female with a male mold attached. Separated from the mold, and in this state, for example, the transfer chuck and the holding tool such as the suction cup, which are kept waiting above the male and female forming dies, are simultaneously driven by From below, between the male and female molds, insert parallel to the female parting surface,
With the transport chuck, the leading end of the painted sheet used in the next molding cycle is gripped, and at the same time, the holding tool such as the suction cup is attached to the male mold by the holding tool advance / retreat drive means. The stacked molded product is moved forward and sucked and held, and the laminated molded product is protruded from the male mold by an ejector pin or the like provided on the male die, and the laminated molded product is picked up by the molded product removal means.

Subsequently, the transport chuck and the laminated molded product held by the holder are moved from the male and female molds to, for example, an upper standby position by the molded product removal drive means. Thus, the next shot of the painted sheet is supplied onto the female parting surface, and the laminated molded product is taken out. Thereafter, the laminated molded product is subjected to a trimming process for trimming an excess portion of the painted sheet. Moved. As described above, by sharing both drive means for sheet conveyance and molded article removal, the molded article removal step in the current molding cycle and the sheet supply step in the next molding cycle are performed simultaneously in parallel. As a result, the cost of the apparatus can be reduced as much as possible, and the time required for one molding cycle is substantially reduced, thereby improving the productivity. In the present invention, the above-described roll / roll method can be used as a method for supplying a sheet with a picture, but the present invention provides a conveying chuck method in which the sheet supplying means includes an unwinder, a conveying chuck, a fixed chuck, and the like. This is particularly effective when using.

Further, as the molded article removing means, a holding tool such as a suction cup and a magic hand for picking up and holding the laminated molded article stuck to the male mold after opening the mold, and the holding tool, Holder driving means for moving in a direction approaching and separating from the female or male mold, and a fluid pressure cylinder, a rack and pinion mechanism, and a screw feed for inserting and removing the holder and the transport chuck between the male and female molds. And a driving means such as a mechanism. In the present invention, the male and female molds are made of metal such as iron or ceramics, and are provided with small holes (vacuum suction holes or the like) for vacuum suction or compressed air supply as necessary.

Further, the female mold is constituted by an aggregate of a plurality of divided parts (in a so-called nested structure), and a slit-like gap is formed between adjacent divided parts, and this gap is formed by a vacuum suction hole (and a compressed air supply hole). ) To perform vacuum suction (and air blow). The male mold is provided with a runner for injecting the resin in a flowing state and a required gate. The number, position, shape and the like of the gates can be freely set in consideration of the shape and the like of the product to be obtained. Also,
The male mold is preferably provided with an ejector pin for separating the laminated molded product adhered thereto, or a laminated product separating means such as a pressurized air jetting means.

Further, a clamp means is provided for fixing and holding the painting sheet on the female parting surface. As the clamping means, a frame-shaped or cross-girder-shaped one can be used. To move the clamp means forward and backward with respect to the female parting surface, use a molding driving force such as a mold clamping operation,
In addition to using the power of the ejector pin driving mechanism, the driving is performed by separately providing a driving means such as a fluid pressure actuator.

In the apparatus of the present invention, after the clamping step, the painted sheet unwound from the unwinder is cut into one-shot sheets for one shot on the upstream side of the clamping means. A sheet cutting means for cutting the painted sheet in the width direction is provided near the upstream end of the mold in the sheet supply direction. As the sheet cutting means, various types such as a cutting blade (cutter), an electrothermal heating wire such as a nichrome wire, an ultrasonic cutter, and a shearing machine can be used. The “upstream side” here means a side closer to the unwinder (or sheet roll).

Further, the apparatus of the present invention is preferably provided with a hot plate for performing preforming. As the hot plate, any of a contact heating system using conduction heat and a non-contact heating system using radiant heat or dielectric heating may be adopted. Further, a cutting means for cutting the painted sheet in the width direction may be provided on the hot platen. As the cutting means, a heating wire made of a heating wire such as a cutting blade or a nichrome wire can be used.

The painted sheet is composed of a base sheet and a decorative layer laminated thereon, and is a laminated sheet (laminated sheet) used as a final product while keeping the base sheet in close contact with the molded product, or Once the painted sheet and the molded article are integrated, any transfer sheet that peels off the substrate sheet (support sheet) while leaving only the decorative layer (transfer layer) on the molded article side can be used. The present invention provides a greater advantage, especially when a laminate sheet is used.

In the case of the laminated sheet, a thermoplastic resin such as polyolefin resin such as polyethylene and polypropylene, polyvinyl chloride, acrylic resin, polystyrene, ABS resin, polycarbonate resin and polyester resin is used as the base sheet. Can be. The thickness of the base sheet is usually about 20 to 500 μm. As the decorative layer, a printed pattern, colored or transparent coating, a metal thin film, or a functional layer such as a hard coating film, an antifogging paint, or a conductive layer can be used.

In the case of the transfer sheet, it is for transferring a transfer layer, such as a picture layer, once formed on a releasable support sheet, to another transfer target. A release layer may be provided according to the conditions, and the transfer layer includes a release layer, a decorative layer, an adhesive layer, and the like, and layers other than the decorative layer are selected as necessary. The decorative layer is selected from a pattern layer, a metal thin film layer (part or entire surface) or a functional layer such as a hard coating film, an anti-fog coating film, or a conductive layer.

The support sheet is made of nylon 6, nylon 6
A flexible thermoplastic resin film such as a polyamide resin such as No. 6 or the like, a polyolefin resin such as polyethylene or polypropylene, polyvinyl chloride or the like, or a laminate thereof is preferable. ABS (acrylonitrile-butadiene-styrene copolymer) resin,
Thermoplastic resins such as polystyrene, polyvinyl chloride, acrylic resin, and polycarbonate resin that have been heated and melted to be in a liquid or fluid state, or two-pack curable and catalyst-curable resins such as urethane resins and polyester resins For example, an uncured liquid, such as uncured liquid, can be made of a material that is conventionally known for simultaneous painting with injection molding, and is selected according to the required physical properties of the product, cost, and the like.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall schematic vertical sectional view showing a typical embodiment of an injection molding simultaneous painting apparatus according to the present invention. Injection molding simultaneous painting apparatus 1 of the present embodiment
The laminated product to be obtained according to 0 is a panel having a rectangular shape and a U-shaped cross section in plan view, and is a product obtained by bonding and laminating a painting sheet S on the surface of an injection resin molded product. Here, as the above-mentioned painted sheet S, a base sheet made of acrylic resin (having a thickness of 125 μm) and a decorative layer (one of acrylic resin and vinyl chloride-vinyl acetate copolymer) laminated thereon by a gravure printing method are used. : 1 weight ratio mixture consisting of a binder, a red stencil, a picture layer of an ink composed of a pigment mainly composed of carbon black) and an adhesive layer (a vinyl chloride-vinyl acetate copolymer system), and a base sheet is formed by injection resin molding. A laminated sheet (laminated sheet) used as a final product while being in close contact with the body is used.

Injection molding simultaneous painting apparatus 10 of this embodiment
Is provided with a female mold 12 and a male mold 30 having an uneven shape corresponding to the above-mentioned laminated product to be obtained. Although not shown, the female mold 12 has a bottom fixed to a movable platen, The ram or the like of the cylinder moves forward and backward in a horizontal direction (X direction in FIG. 1), in other words, in a direction approaching and separating from the male mold 30. In the present embodiment, the female mold 12 is a movable mold as described above and is configured to move in the horizontal direction. However, the present invention is not limited to this.
For example, it is also possible to adopt a form in which a male mold and a female mold are vertically opposed to each other and one of them is moved in the vertical direction.

A cavity 13 corresponding to the laminated product to be obtained is formed in the female mold 12.
Are provided with a number of vacuum suction holes 15, 15,... For vacuum suction so as to extend the painting sheet S along the cavity 13.
Are connected to a vacuum source (not shown) including an external vacuum pump and the like via a vacuum suction passage 18 and a conduit 19.

Further, the parting surface 1 of the female mold 12
On the outer peripheral side of 4, an annular mounting groove 23 in which an O-ring 22 is mounted is provided. The O-ring 22 hermetically seals the cavity 12 and the outside when a rectangular frame-shaped or cross-girder-shaped clamper 20, which will be described later, is pressed against the parting surface 14 of the female die 12 with the painting sheet S interposed therebetween. Acts as a barrier to

On the other hand, although not shown, the male mold 30 is fixed to a fixed plate on which a nozzle of an injection molding machine is mounted, and the male mold 30 has a convex corresponding to the laminated product shape. A core portion 31 is provided, and a runner 32 for injecting the molten resin and a gate 33 connected to the runner 32 are provided inside the core portion 31.

The female die 12 is provided with a clamper 20 having a rectangular frame shape or a girder shape in a plan view so as to press and fix the supplied one-shot painting sheet S on the parting surface 14. Is provided. This clamper 2
No. 0 can be moved in the vertical direction (X direction in the drawing) with respect to the parting surface 14 by driving means (not shown) through four sliding rods 24 connected to the four corners. I have.

Further, a hot plate 80 as shown in FIG. 4 is provided for performing preforming. The hot platen 80 is moved by a hot platen transfer means (not shown) such as an air cylinder from a standby position outside the male and female forming dies to a heating position of the painted sheet on the parting surface 14 of the female die 12, The painting sheet S is heated and softened. The hot platen 80 is a non-contact heating method using infrared radiation in the example of FIG.
Of course, a contact heating system that uses heat conduction by contacting the sheet with a picture may be used.

On the other hand, below the female mold 12 (on the upstream side when viewed in the sheet supply direction), a winding sheet for supplying a painting sheet (laminated sheet) S on the parting surface 14 of the female mold 12. An output device 50, a pair of feed rollers (nip rollers) 52, an opening / closing-type fixed chuck 54 for temporarily holding and fixing the picture sheet S, and a sheet cutting device 60 are provided. The unwinder 50 and the fixed chuck 54 are respectively provided with support members 55 on the female mold 12.
, And 56 so as to be moved together with the female mold 12 in a direction approaching and separating from the male mold 30.

In the upper part between the male and female molds 12 and 30 (downstream when viewed in the sheet feeding direction), FIG.
In addition to FIG. 2 and FIG.
A transport chuck 57 and a laminated molded product removal machine 70 are arranged. The molded product take-out machine 70 includes a holder 75 including four suction cups (adsorbers) for picking up and holding the laminated molded product P (indicated by phantom lines in FIG. 2) attached to the male mold 30;
A holder moving / retracting (fluid pressure) cylinder 77 serving as a holder driving means for moving the holder 75 in a direction approaching and separating from the male mold 30;
(Fluid pressure) cylinder 7 for taking out a molded product as a taking-out drive means for taking in and out between the male and female forming dies 12, 30.
And 2.

More specifically, as shown in FIG. 3, a rectangular support plate 73 is attached and fixed to the tip end of a piston rod 72a of the take-out cylinder 72, and a box-shaped bottom opening is provided at both ends of the support plate 73. The guide holders 74, 74 are attached, and the upper end of a holder support tube 76, to which two holders 75 each composed of the suction cup are attached, is slidably fitted to each of the guide holders 74, 74. While being inserted and supported, a retainer advance / retreat cylinder 77 for reciprocatingly moving the retainer support tube 75 in a direction to approach and separate the female mold 30 is attached to the lower side of the guide holding members 74, 74, The tip end of the piston rod 77 a of the holder moving cylinder 77 is connected to the holder supporting tube 76.

Incidentally, the holder 75 composed of the suction cup is connected to an external vacuum pump via the holder support tube 76. A transfer chuck 57 is attached to the piston rod 72a of the take-out cylinder 72 via an L-shaped support member 58 so as to be integrally movable.

The transport chuck 57 grips the leading end Sa of the picture sheet S unwound from the unwinder 50 loaded with the long strip-shaped picture sheet (sheet roll), and forms a female mold. 12 has a transport chuck 50 of an open / close sandwiching type that transports the parting surface 14 from the bottom to the top and near the upper end thereof. The transfer chuck 50 is moved from the standby position shown in FIG. 1 between the female parting surface 14 and the clamper 20 (Z direction = vertical direction) from the standby position shown in FIG. It can be lowered and raised straight.

The transport chuck 57 and the fixed chuck 54 have their opening and closing chuck portions 57a and 54a opened and closed by an air cylinder or the like (not shown).
In FIG. 3A, comb-shaped irregularities are formed so as to be inserted into each other so that the leading end portion Sa of the painting sheet S can be securely grasped and delivered (the transport chuck 57 side is shown in FIG. 3). .

Further, the sheet cutting device 60 disposed below the female die 12 is provided with the following. It is for cutting into single sheets of shots, and is mounted on the fixed chuck 54 via a support member 59. One or a plurality of cutting air cylinders 62 and this cutting air cylinder 62 are provided. And a wide cutting blade (cutter) 65 provided at the tip of the piston rod 62a for cutting the sheet S with a picture in the width direction.

When performing simultaneous injection molding painting by the simultaneous injection molding painting apparatus 10 of the present embodiment having the above-described configuration, in the first molding cycle in which the laminated molded product P has not been obtained yet. First, as shown in FIG. 1, the leading end of the painted sheet S unwound from the unwinder 50 via the sheet feed roll 4 is supplied to supply the painted sheet S onto the female parting surface 14. As shown in FIG. 2, the holding chuck 54 holds and fixes the transfer chuck 57 from the standby position shown in FIG. 1 by projecting the piston rod 72 a of the molded product take-out cylinder 72. By lowering straight down in the direction along the female parting surface 14 to a position where the leading end portion Sa of the painted sheet S gripped by the chuck 54 can be gripped, The opening / closing chuck portion 57a of the feeding chuck 57 is closed, and the opening / closing chuck portion 54a of the fixed chuck 54 is opened to deliver the leading end of the sheet S with the image to the transport chuck 57 side. 72a is drawn in, and the transport chuck 57 is raised straight along the female parting surface 14. As a result, similarly to the state shown in FIG. 8 described later, the one-shot painting sheet S is supplied onto the female parting surface 14 (sheet supplying step). In the first molding cycle, the molded product removal machine 70 does not take out the laminated molded product P.

As described above, the sheet S with the picture is
After being supplied onto the second parting surface 14, as shown in FIG. 4, the clamper 20 is advanced toward the parting surface 14, and the painted sheet S is pressed against the parting surface 14 by the clamper 20. Hold fixedly (clamping process).

At the same time as the completion of this clamping step, the open / close chuck portion 54a of the fixed chuck 54 is closed,
While holding the picture sheet S, the piston rod 62a of the cutting air cylinder 62 is protruded, and the picture sheet S is cut in the width direction by a cutting blade 65 provided at the tip of the cutting air cylinder 62. One minute sheet is obtained (sheet cutting step).

Subsequently, as shown in FIG.
Is moved onto the painted sheet S fixed and held by the clamper 20, and the female parting surface 14 is moved.
To soften the painted sheet S at the sheet heating position (the illustrated position), and
Vacuum suction is performed by a vacuum suction means including a vacuum suction hole 15 or the like, which is opened to stretch the painted sheet S so as to adhere closely to the female mold cavity (stretching step).

Thereafter, as shown in FIG.
Is moved to the male mold 30 side, and the male mold 30 and the female mold 12 are clamped to form a molding cavity 13 ′ between the molds 12 and 30 (mold clamping step). The cavity 13 'is filled with a resin Pr in a flowing state, and the obtained injection resin molded body Ps (FIG. 6) and the painted sheet S are laminated and integrated (injection molding step). After the compact Ps is completely solidified, the female mold 12 is retracted to the original position, and the male and female molds 12, 30 are opened (opening step). In the mold opening step, as shown in FIG. 6, the laminated molded product P in which the painting sheet S is adhered and laminated on the injection resin molded body Ps is separated from the female mold 12 in a state where the laminated molded product P is stuck to the male mold 30. ing.

Next, in the same manner as in the first molding cycle described above, the transfer chuck 57 and the holder 75, which are waiting above the male and female molding dies 12, 30 by the molded product take-out cylinder 72, are connected. At the same time, from the upper part to the lower part, between the male and female forming dies 12, 30 in parallel with the female parting surface 14, and by the transfer chuck 57, the leading end of the picture sheet S to be used in the next forming cycle. At the same time, the holder 75 is moved forward by the holder moving cylinder 77 toward the laminated molded product P stuck to the male mold 30 to hold it by suction (see FIG. 2). In this state, as shown in FIG. 7, as shown in FIG. 7, the multilayer molded product P is protruded from the male mold 30 by an ejector pin 38 provided on the male mold 30 and the like. Retracting the retainer 75 to fit, take up the laminate molded article P in the molded article take-out machine 70 side.

Subsequently, as shown in FIG. 8, the stacked molded product held by the holding chuck 75 and the transport chuck 57 holding the leading end of the picture-sheet S by the molded product take-out cylinder 72. P and male and female molds 12, 30
Move from above to the standby position above. As a result, the painted sheet S for the next shot is supplied onto the female parting surface 14, and the laminated molded product P is taken out. Thereafter, the laminated molded product P trims the surplus portion of the painted sheet. The process is shifted to a trimming step and the like, and the subsequent molding cycle is repeated in the same manner as described above.

As described above, in the simultaneous injection molding painting apparatus 1 of the present embodiment, both the driving means (fluid pressure cylinder 72) for sheet conveyance and the removal of the molded product are shared, and the molding in the current molding cycle is performed. Since the product removal process and the sheet supply process of the next molding cycle are performed simultaneously in parallel, the equipment cost can be reduced as much as possible, and the time required for one molding cycle is substantially reduced. , And productivity is improved.

In the above embodiment, the unwinding machine is arranged below the female die, and the painting sheet is conveyed from below to above by the conveying chuck. However, the present invention is not limited to this. It goes without saying that the painted sheet may be conveyed from top to bottom or in the left-right direction, and the molded article unloading machine may be disposed in any of the upper, lower, left and right sides of the male and female molds.

[0052]

As will be understood from the above description, according to the simultaneous molding method and apparatus for injection molding according to the present invention, both driving means for sheet conveyance and for removing molded products are shared, and Since the molded product removal process in the cycle and the sheet supply process in the next molding cycle are performed simultaneously in parallel, the equipment cost can be reduced as much as possible, and the time required for one molding cycle is substantially reduced. And productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of an injection molding simultaneous painting apparatus according to the present invention.

FIG. 2 is a schematic longitudinal sectional view for explaining a sheet conveying step in a first forming cycle of the apparatus shown in FIG. 1;

FIG. 3 is a perspective view showing a molded product unloading machine used in the apparatus shown in FIG. 1;

FIG. 4 is a schematic longitudinal sectional view used for explaining a clamping step, a sheet cutting step, a heat softening step, and a stretching step of the apparatus shown in FIG.

FIG. 5 is a schematic longitudinal sectional view used for explaining an injection molding process of the apparatus shown in FIG. 1;

FIG. 6 is a schematic longitudinal sectional view for explaining a mold opening step of the apparatus shown in FIG. 1;

FIG. 7 is a schematic longitudinal sectional view for explaining the first half of a sheet supply step and a molded article removal step of the apparatus shown in FIG. 1;

FIG. 8 is a schematic longitudinal sectional view for explaining the second half of the sheet supply step and the molded article removal step of the apparatus shown in FIG. 1;

[Explanation of symbols]

 S Painting sheet (laminated sheet) 10 Injection molding simultaneous painting apparatus 12 Female mold 13 Cavity 14 Parting surface 15 Vacuum suction hole 20 Clamp 30 Male mold 50 Unwinder 52 Sheet feed roller 54 Fixed chuck 57 Transfer chuck 60 Sheet cutting device 70 Mold removal machine 72 Mold removal cylinder 75 Holder (sucker) 77 Holder advance / retreat cylinder

Claims (6)

[Claims] A sheet feeding step of gripping a leading end portion of a long strip-shaped picture sheet unwound from an unwinder with a transport chuck and supplying one shot thereof to a female parting surface; A clamping step of fixing and holding the sheet on the parting surface of the female mold by clamping means, a stretching step of stretching the painted sheet so as to closely adhere along the parting surface of the female mold, One of the male molds is moved to the other side to perform mold clamping, a mold clamping step of forming a cavity between both molds, and injecting and filling a resin in a flow state into the cavity, and an obtained injection resin molded body. An injection molding step of laminating and integrating the painted sheets, and a mold opening step of separating the female mold and the male mold, including, between the female mold and the male mold with the transport chuck. You can get in and out By the molded article removal means
In parallel with the sheet supply step of the next shot of the painted sheet, a step of taking out the laminated molded product on which the painted sheet is bonded and laminated from the male mold and transporting the molded article to the outside is performed. Method. 2. The method according to claim 1, wherein after the clamping step, the painted sheet unwound from the unwinding machine is cut into one-shot sheets for one shot upstream of the clamping means. Injection molding simultaneous painting method as described. 3. An elongated machine having a female mold and a male mold arranged opposite to each other so that one can be moved to the other side, an unwinding machine and a transport chuck, and unwinding from the unwinding machine. Sheet supply means for gripping the leading end of the belt-shaped painted sheet with the transport chuck and supplying one shot thereof on the female parting surface, in a direction orthogonal to the female parting surface Clamping means which is movable and presses and holds the painting sheet against the female parting surface, vacuum suction means for extending the painting sheet along the cavity of the female mold, and the female mold Resin injection means for injecting and filling a resin in a flow state from the male mold side into a cavity formed between the female mold and the male mold, and being moved in and out between the female mold and the male mold with the transfer chuck. Like that, An injection molding simultaneous painting apparatus comprising: a molded product removal means for picking up, from the male mold, the laminated molded product on which the painted sheet is adhesively laminated and transporting the molded product to the outside. 4. The conveyance chuck of the sheet supply means,
4. The method according to claim 3, wherein the molded product removing means is configured to be reciprocated in a direction along the parting surface of the female mold by a molded product removal driving unit such as a fluid pressure cylinder provided in the molded product removing unit. Injection molding simultaneous painting apparatus as described in the above. 5. The molded product taking-out means includes: a holding tool such as a suction cup or a magic hand for holding the laminated molded product;
5. The simultaneous injection molding and painting apparatus according to claim 3, further comprising: a holder advance / retreat drive unit that moves the holder in a direction approaching or separating from the female mold or the male mold. 6. . 6. A fixed chuck for gripping the painted sheet and a sheet cutting means for cutting the painted sheet in a width direction are provided near the upstream end of the female mold as viewed in the sheet supply direction. 4. The method according to claim 3, wherein
6. The simultaneous injection molding painting apparatus according to any one of claims 1 to 5.