JPS59202830A - Injection molding device for foil decorating - Google Patents

Abstract

PURPOSE:To obtain the injection molding device for foil decorating capable of achieving the perfect synchronization of a printed image with a formed product by feeding the continuous sheet like a roll having printed images into a mold, while positioning said sheet by a positioning mark. CONSTITUTION:The operation of the servo motor for transferring integrally a heating plate 44 and a frame part 46 is stopped, when a detector 54 detects the holizontal line (a) of the positioning mark T of a sheet 32. Then both members 44, 46 are moved in Y-direction. When the detector 54 detects a vertical line (b), the heating plate 44 is moved to the regular position in relation to the printed image. Next, the heating plate 44 with sheet stuck thereon via air holes 50 of a heating part 44a is moved, whereby the sheet 32 is clamped between both members 44 and 46. Then, both members 44, 46 return to the original positions and an air cylinder 52 is extended. Both members 44, 46 are integrally lowered along a rail 42 and are stopped at the specified position on a female mold 18. With this operation, the sheet is unwound by one pitch. The frame member 46 whose lower portion is opened, is enabled to enclose the female mold 18, and the heating plate 44 closes the cavity of the female mold 18, while said plate 44 holds the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding apparatus for decoration that performs decoration simultaneously with injection molding.

In order to carry out decoration at the same time as injection molding, generally, before injection molding, a decorative sheet is preformed in the female mold by vacuum forming, and then
A female mold and a male mold are combined, a bath-stripping resin is injected from the male mold side, and a painted sheet is attached to the surface of the injected resin.

Conventionally, this type of molding has been carried out by preparing an injection molding device that creates a male mold and a female mold, and inserting a sheet with a foliage pattern printed in advance by an operator between the two molds. Therefore, the rate was not %' and productivity was poor.

Therefore, a continuous method has been considered in which the strip-shaped sheet is intermittently sent between the two molds to perform the decoration continuously, but in such a continuous method, the strip-shaped decorated sheet is heated and then moved onto the female mold. Therefore, there was a problem in that the positional relationship between the pattern and the molded product was likely to shift due to the sagging of the patterned sheet due to heating. Particularly in the horizontal type, in which the male die and the 1& die are placed horizontally in front of each other, and the painted sheet is fed vertically, it is difficult to align the pattern with the molded product because the painted sheet sag due to heating. .

In view of the above, the present invention provides an injection molding apparatus for decoration that continuously feeds a roll-shaped continuous sheet with a pattern printed into the mold and performs decoration at the same time as injection molding. It is our pleasure to provide an injection molding system for saddle mounting that can be completely completed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the beam arrangement of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of a finished product molded according to the present invention. A painted sheet 2 is attached to the surface of the main body 1 on which the molten resin has solidified, and the floral pattern 10 on the painted sheet 2 is a curved part of the main body 1. At the bottom of the illustrated sheet 2, letters 12 are drawn.

FIG. 2 is a longitudinal sectional view of the injection molding apparatus M of the present invention,
At the bottom thereof, a male mold 16 is fixed to the fixed platen 20.
and a female mold 18 which is fixed to a movable platen 24 and moves toward and away from the male mold 16 in the horizontal direction. The ejector 24 is an ejector bin (not shown) for ejecting the molded product from the mold after injection molding.
It is equipped with

An injection device is inserted into the center of the fixed platen 20 and the male mold 16, and the molten resin injected from the injection device @4 passes through an injection hole 30 provided in the male mold 16 and enters the female mold 18. is press-fitted into the cavity.

A painted sheet 32 runs vertically downward between the two molds, and the painted sheet 32 passes through an unwinding roll 34 located above.
The page is held by a take-up roll 36 located below, and its traveling position is regulated by upper and lower guide rolls 38,38.

A predetermined pattern is printed on the picture sheet 32 at a fixed pitch, and if it is to be used for reverse printing or transfer, it is set so that the printed side is on the opposite side to the female g48, and vice versa. The stand is set so that the printing side faces the female mold side.

Incidentally, along with the design, positioning marks T (+-marks) are printed at regular pitches on the sheet as shown in FIG. The mark 40 consists of a horizontal line a that determines the position in the vertical direction (X direction) and a vertical line 2 that determines the position in the left and right direction (Y direction), and these lines a and b may be formed separately.

A frame member 46 and a heating plate 44 integrally opposed to the frame member 46 are disposed above both molds, and these members 44.4
6 cooperate with each other to hold the sheet 32 and move the illustrated sheet 32 between the two spaces. The frame member 46 has a U-shape and is supported on the rail 42 so as to be freely slidable so that the lower part thereof is open, and two of the frame members 46 are provided on both sides of the female mold 18 in the vertical direction.

The heating plate 44 has a heating section 44a'f inside thereof, and the heating section 44a is provided with a ventilation hole 50, which is connected to the compressed air pump shown in the figure through a common guide hole 51. It is connected. The heating plate 44 is moved vertically by an air cylinder 52, and the cylinder 52 is held movably by a frame (not shown), and the heating plate material is separated from the frame member 46 by an air cylinder, an oil cylinder, a motor, etc. (not shown). moved in the direction of contact.

Detectors 54 such as phototubes are provided above and below the heating plate 44 or the frame member 46 to detect the mark T on the illustrated sheet 32, and two detectors 54 are provided for X-direction detection and two for Y-direction detection. Preferably, a detector 54 is provided.

Further, below the female mold 18, a rod member 56 for supporting the painted sheet 32 is installed facing each other, and the rod members 56 are moved toward and away from each other by an air ring (not shown) supported by the movable plate 24. In addition, a vent hole 58 is provided in the Mae-Yoshimi mold #18 for vacuuming.

Next, the operation of this device will be described.

First, when the detector 54 detects the horizontal Ωa of the mark T on the sheet, the operation of the servo motor (not shown) for integrally moving the heating plate 44 and the frame member 46 is stopped, and then both members 44. 46 is moved by a servo motor (not shown), and when the detector 54 detects a vertical line, the servo motor is stopped and the heating plate 44 is moved to a normal position with respect to the pattern.

The sheet is then applied onto the heating section through the vent '50 of the heating section 44a. Further, the heating plate 44 is moved toward the frame member 46 by the operation of an air cylinder (not shown), and the sheet 32 is sandwiched between the two members 44 and 46.

Thereafter, both members 44 and 46 are returned to the basic position by the action of the servo motor, and as shown in FIG.
The air cylinder 52 supporting the grapes extends and the frame member 46
The heating plate 44 is integrally lowered from the reference position along the rail 42 and stopped at a predetermined position above the female mold 18. Along with this, the sheet is unwound by -pitch.

Since the lower part of the frame member 46 is open, the frame member 46
6 can surround the female mold 18, and a heating plate 44 holds the sheet to close the female mold 18 cavity.

In this case, the pattern on the sheet is placed at the normal position (synchronized position) with respect to the molding surface of the female mold.

In this state, first, the cavity of the female mold 18 is evacuated through the vent hole 58 of the female mold 18. After that, the heating plate 44
Compressed air is sent through the ventilation hole 50 to peel the sheet 32 from the surface of the heating section 44a, and the sheet 32 is attached to the molding surface of the female mold 18 as shown in FIG.

In addition, in the case of deep drawing, that is, when the molding surface of the female mold is deep, a part of the heating plate material can be moved toward the molding surface of the female mold and vacuumed while holding the entire sheet with a gas cylinder, etc. The sheet can be preformed without excessive stretching.

In the above process, the cavity of the female mold 1B is evacuated and then compressed air is sent from the heating plate side to adhere the sheet to the molding surface of the female mold.
However, in this case, it is necessary to provide a large number of vent holes 58 in the female mold. This is because air remains in the cavity. On the other hand, according to the former method, since no air remains in the special female mold for sheet molding, there is no need to provide a large number of vent holes. Therefore, it is possible to reduce the number of traces of ventilation holes that occur on the surface of the molded product.

After that, the heating plate 4 is heated by the operation of the air cylinder shown in the figure.
4 is lifted up from the frame member 46, and the air cylinder 52 is operated to return both members 44 and 46 to the basic position shown at 21Z1. At this time, the rod member 56 clamps the illustrated sheet 32 so that it does not move.

As shown in FIG.
ejected from. Furthermore, the mold is released and the rod member 56 is shaded. In this way, only the export sheet 32 itself or that day's printing ink adheres to the material of the injection molding section 600, and an fc molded product is obtained.

Note that the detector 54Vi first moves in the X direction, then in the Y direction f:
Alternatively, it is also possible to detect when the marks in the X and Y directions are not present. However, the method of simultaneously detecting vC in the X and Y directions is inferior in accuracy.

By the way, the control of the air cylinder 52, etc. is carried out by using one common control circuit.

Furthermore, although the method "False #ρ1" is described for the case where the mold is arranged horizontally, it goes without saying that it can also be applied to the case where the mold is arranged entirely vertically.

In this case, the heating plate 44 and the frame member 46 will move in the horizontal direction.

Since the present invention is purchased as described above, it has the effect that the injection molded body and the pattern can be completely synchronized with each other while continuously feeding the sheet one pitch at a time with the pattern.

[Brief explanation of drawings]

Figure 1 is a perspective view of the painted molded product, Figure 2 is a vertical sectional view of the device, Figure 3 is a plan-concave view of the painted sheet, Figure 4 is a diagram of the completed sheet preforming, and Figure 5. 6 is a diagram of the inside of the female mold after completion of preforming, and FIG. 6 is a longitudinal sectional view of the male and female mold parts during injection molding. 16...Male type, 18...Female type, 32...Painted sheet, 42...Rail, material...Heating member, 46...
Frame member, 52... cylinder, 54... detector. Applicant's agent Kiyoshi Inomata Figure 4 Figure 5 Figure 6 Figure 0 Procedural Sleeve Book July 1948 r lj Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of Case 1984 44'' Patent Application No. 78592 2. Name of the invention: Painting injection mold device 3゜Relationship with the case of the person making the amendment Patent applicant (289) Dainippon Printing Co., Ltd. The specification and drawings are transcribed as attached (no changes in content). Procedural amendments dated T/S, 1982 Kazuo Wakasugi, Commissioner of the Patent Office1, Indication of the case, Patent Application No. 78592, filed in 1982,2, Name of the invention, Injection mold device for decoration 3, Person making the amendment Case Relationship with Patent Applicant (289) Dai Nippon Printing Co., Ltd. 7, "Detailed Description of the Invention" column of the specification subject to amendment. 8. Contents of amendment 1) The following statement should be inserted next to "Connected." on page 6, line 18 of the specification. "The heating part 44a of the heating plate 44 is composed of a heating plate (heat plate) equipped with ventilation holes 50, a sintered metal plate, or a high-frequency heating plate. Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of the case 1982 Patent Application No. 78592 2 Name of the invention Injection molding mold device for decoration 3 Relationship with the amendment person case Patent applicant (289) Nippon Printing Co., Ltd. 4 Agent 7 Subject of amendment: '゛ii The "Detailed Description of the Invention" column of the specification. 8 "Printing" in lines 17 to 18 of page 5 of the specification of the amendment was revised to "printing (vapor deposition or coating)": Ugaki%.

Claims (1)

[Claims] 1. Before injection molding, a painted sheet is vacuum-adhered to the molding surface of the female mold, and then the female mold and the male mold are combined and molten resin is injected from the male mold side. In a painting injection molding mold device for integrating a painted sheet and an injection resin, a painted sheet unwinding and winding 90-rule installed so that the painted sheet runs while occupying the frontage of a female mold; a heating plate that is movable from the upstream side of the sheet to above the female mold by one pitch of the pattern of the illustrated sheet and has a ventilation hole, and a frame member that holds the illustrated sheet together with the heating plate and moves together with the heating plate. and a moving device for integrally moving the heating plate and the frame member in the running direction of the painted sheet and a direction perpendicular thereto; a transfer device that moves the moving direction; and a device that is attached to at least one of the heating plate or the frame member and that reads positioning marks in the traveling direction of the illustrated sheet and a direction perpendicular thereto, which are formed in advance on the illustrated sheet at each pattern pitch. When the detector reads the positioning marks in both directions due to the operation of the pre-offence transfer vJ device, the read signal causes the transfer device to stop, and the pre-offender self-heats at this position. The plate and the frame member clamp the illustrated sheet, and after this clamping, the heating plate and the frame member return to the reference position, and then the heating plate and the frame member are conveyed between the two molds by the action of the conveying device. 9. Injection molding mold device for painting with features. Does the moving device include a servo motor? An injection mold for sexual characteristics as set forth in claim 1
Agency. 3. A guide rail is arranged from the clamping position of the painted sheet of the heating plate and frame member to the position where both molds are arranged, and the heating plate and the frame member reciprocate together along this guide rail. An injection molding apparatus for painting according to claim 1 or 2.