JPH0110185Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a partial trimming mold device that simultaneously trims a decorated sheet and attaches it to the surface of the molded product when injection molding a resin molded part.

[Prior art]

2. Description of the Related Art There are molded products used as automobile parts, electrical appliances, miscellaneous goods, etc., in which a painted sheet with a pattern printed to match the irregularities is attached to the surface of a resin molded product having irregularities.

As an apparatus for manufacturing such a molded article, there is one that trims a decorated sheet and attaches it to the surface of the molded article at the same time as injection molding. Specifically, Japanese Patent Application Publication No. 1987-
No. 220716, JP-A-57-91246 or JP-A-59-
This is a device disclosed in No. 5043, etc.

The device disclosed in Japanese Patent Application Laid-Open No. 58-220716 has a movable member separate from the mold forming the cavity, and this movable member is operated by a cylinder separate from the one used for clamping the mold, and a cutter blade attached to the movable member. The sheet is trimmed with
The device disclosed in JP-A No. 57-91246 moves a fixed core forward to trim the sheet, and then fixes the sheet by suction to prevent it from falling off. This device uses a cutting punch provided separately from the mold to trim the transfer sheet so that it faces inside the cavity.

[Problem that the invention attempts to solve]

Since the above-mentioned conventional mold apparatus performs trimming using a cylinder separate from that for mold clamping, the apparatus itself is complicated, and trimming defects are likely to occur due to cylinder wobbling. Furthermore, with the conventional mold apparatus, there is a problem in that it is extremely difficult to partially decorate a deep-drawn three-dimensional molded product.

[Means to solve the problem]

In order to solve the above problems, the present invention has a pair of injection molds, one of which is formed with a blade that partially trims the painted sheet at the same time as mold clamping, an injection device is attached to the other mold, and this injection device An injection hole was formed to supply the molten resin into the cavity, and trimming was performed during mold clamping, allowing injection molding to be performed as is.

[Example of idea]

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

FIG. 1 is a longitudinal cross-sectional view of the mold device according to the present invention, in which 1 is a male mold and 2 is a female mold. is bored, and an injection device 5 attached to the male mold 1 faces the injection hole 4.

The female mold 2 is provided with vacuum holes 6, 6 which open into the molding surface, and a trimming blade 7 is provided on a part of the protruding molding surface. Further, a guide rail 20 is installed between the male mold 1 and the female mold 2, and the female mold 2 approaches and separates from the male mold 1 along this guide rail 20. An intermediate die 8 is attached to the guide rail 20, and a blade portion 9 is provided around the opening of the intermediate die 8. Furthermore, the female mold 2 is a movable plate 10.
The movable platen 10 is movable by a pressurizing ram. The guide rail 20 is provided at a position offset from the joint surface of each mold, and extends within the ears 8a, 2a that are normally formed protruding on both sides of each mold.
Buffer springs S, S are provided on the guide rail 20 between the female mold 2 and the intermediate mold 8, so that the joining of each mold is performed in a cushioning manner.

Further, between the male mold 1 and the female mold 2, a painted sheet 11 can run vertically downward, and the painted sheet 11
is held by an unwinding roll 12 located above and a take-up roll 13 located below, and its traveling position is regulated by upper and lower guide rolls 14, 14.

A predetermined picture is printed on the picture sheet 11 at regular pitches, and if it is to be used for back printing or transfer, it is set so that the printed surface is on the opposite side to the female die 2. A positioning mark 15 is printed on the illustrated sheet 11, and this mark 15 consists of a horizontal line for determining the vertical position and a vertical line for determining the horizontal position.

On the other hand, a frame member 16 is provided above the male mold 1 and the female mold 2.
A heating plate 17 is disposed integrally with and facing the heating plate 17, and these members 16 and 17 cooperate with each other to sandwich the sheet 11 and move the sheet 11 between the molds. The frame member 16 has a U-shape, has an open bottom, and is slidably supported by a rail 18.

The heating plate 17 can be moved up and down by an air cylinder 19, and the cylinder 19 is rotatably held by a frame (not shown), and the heating plate is moved toward and away from the frame member 16 by a cylinder or motor (not shown). will be moved to

Detectors 21 for detecting the mark 15 on the illustrated sheet 11 are provided above and below the heatable plate 17 and the frame member 16, and there are two detectors 21 for detecting in the vertical direction and one for detecting in the horizontal direction. It is desirable to provide two. Also, below the female mold 2 is a painted sheet 11.
Rod members 22, 22 supporting the above are installed opposite each other, and these rod members 22, 22 are moved toward and away from each other by an air cylinder supported by the movable platen 10.

Next, the function of this device will be described.

First, when the detector 21 detects the horizontal line of the mark 15 on the sheet 11, the heating plate 17 and the frame member 16
The operation of a servo motor (not shown) for integrally moving both members 1 stops, and then both members 1 are moved horizontally.
6 and 17 move, and when the detector 21 detects a vertical line, the servo motor stops and the heating plate 17 moves to a normal position with respect to the pattern. Next, the heating plate 17
moves in the direction of the frame member 16 and holds the sheet 11 between both members 16 and 17.

After that, the air cylinder 19 is operated to remove the frame member 16.
The heating plate 17 is lowered integrally along the rail 18 as shown in FIG. 2, and stops at a position facing the molding surface of the female mold 2. Along with this, the sheet 11 is unwound by one pitch.

Thereafter, the illustrated sheet 11 is attracted to the molding surface of the female mold 2 through the vacuum holes 6, 6. At this time, if compressed air is sent from the heating plate 17, the sheet 11 can be easily peeled off from the heating plate 17. In the case of deep drawing, if a part of the heating plate 17 is moved toward the forming surface while holding the sheet with a cylinder (not shown) and then evacuated, the sheet can be preformed without being excessively stretched.

Thereafter, the heating plate 17 is separated from the frame member 16 and both members are returned to their reference positions. At this time, the rod member 22
clamps the sheet 11 to prevent it from moving.

Next, the female mold 2 is moved in the direction of the male mold 1,
The mold is clamped as shown in FIG. During this mold clamping, the decorative sheet 11 is trimmed between the blade part 7 of the female mold 2 and the blade part 9 of the intermediate mold 8, and a part of the trimmed decorative sheet 11 is adsorbed to the molding surface of the female mold 2. Keep the mold closed. Then, as shown in FIG. 4, the molten resin 24 from the injection device 5 is injected into the cavity 23 formed by the mold clamping through the injection hole 4.

A molded article obtained by this method is shown in FIG. That is, a convex portion is formed on the surface of the molded product 25,
A picture sheet with a pattern printed on it is attached to this convex portion.

[Effect of idea]

As explained above, according to the present invention, since the trimming blade is formed on one of the pair of molds,
Trimming can be done at the same time as mold clamping, which not only simplifies the equipment itself, but also eliminates the need for a separate cylinder for trimming.
Trimming defects due to cylinder wobbling do not occur. Further, the mold device according to the present invention exhibits many effects such as being able to extremely easily apply partial decoration to a deep-drawn three-dimensional molded product.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a partial trimming mold device according to the present invention, FIGS. FIG. 5 is an overall perspective view of the injection molded product. DESCRIPTION OF SYMBOLS 1... Male mold, 2... Female mold, 4... Injection hole, 5... Injection device, 6... Vacuuming hole, 7, 9... Blade part, 8... Intermediate mold, 11... Painted sheet, 16... Frame member, 17...
heating plate, 23... cavity, 24... molten resin, 2
5... Molded product.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Continuously feeding a band-shaped painted sheet between a male mold and a female mold, trimming a part of the painted sheet,
A part of this trimmed painted sheet is attached to the cavity surface formed when the mold is closed,
In a mold device that injects molten resin into the cavity in this state, an intermediate mold is provided between the male mold and the female mold so as to be movable along a guide member; A blade part is formed for trimming the illustrated sheet when the mold is clamped, and a blade part is formed around an opening into which the protruding part of the female mold of the intermediate mold opposite thereto is inserted. A part characterized in that the painted sheet is partially trimmed by engagement with the mold, and the male mold is provided with an injection hole opening in the cavity surface and an injection device for supplying molten resin to the injection hole. Trimming mold equipment. 2. The part according to claim 1 of the utility model registration claim, characterized in that one of the molds in which the trimming blade is formed has a vacuum hole for preforming the illustrated sheet. Trimming mold equipment.