JPH0734659Y2 - Vacuum forming machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of use] The present invention relates to a vacuum forming machine for clamping a thermoplastic resin sheet and forming the sheet using a vacuum mold.

[Conventional technology]

A conventional vacuum forming machine of this type is shown in FIGS. 3 to 6. That is, as shown in FIG. 3, a vinyl chloride resin is applied to the back surface of a cloth 2 such as a nylon woven fabric and dried to integrally form a resin coating layer 3 on the periphery of a cloth body 1. The cloth body 1 is held by a fixed die 5 and a movable die 6 of an injection molding die.
Located between and. Next, after heating the fabric body 1 located between the molds 5 and 6 by the heater 7 to soften it,
At the same time as removing the heater 7, the fabric body 1
While pressurizing by means of 6 and 6, a vacuum valve (not shown) leading to the vacuum suction hole 8 is opened, and the fabric body 1 is passed through the vacuum suction hole 8.
The air between the fixed mold 5 and the fixed mold 5 is sucked to bring the cloth body 1 into close contact with the fixed mold 5 as shown in FIG. Next, a foaming resin is injected and foamed from the nozzle 9 to mold the foam layer 10 integral with the fabric body 1 to obtain a molded product 11 as shown in FIG.

[Problems to be solved by the device]

However, in the above-mentioned conventional example, as the clamping means 4 of the fabric body 1, as shown in FIG.
And the holding plate 12a attached to each of the upper clamp frame 4b
And the cloth body 1 are positioned between the cloth body 1 and the cloth body 12b, and then the upper clamp frame 4b is lowered by the driving of the drive gear 13, and
The upper and lower sides of the mold are clamped and held, and then positioned between the molds 5 and 6 as shown in FIG. Therefore, since the clamping means 4 of the fabric body 1 holds the peripheral edge of the fabric body 1 in the vertical direction (thickness direction) with a uniform pressure, it is possible to perform vacuum forming by both molds 5 and 6. However, even if the pole part (1 part) of the fabric body 1 is stretched in response to the unevenness of the mold, it is not possible to deal with the partial stretch, which causes wrinkles and the like on the surface of the molded product. Therefore, there is a problem that defective molded products occur.

[Means for Solving the Problems]

The present invention was made by focusing on such problems,
A structure in which the peripheral edge of the fabric body is clamped by a roll bar allows partial expansion of the fabric body 1 in correspondence with the irregularities of the molding die, thereby facilitating familiarity with the die surface of the molding die, Accordingly, it is an object of the present invention to provide a vacuum forming machine capable of obtaining a high-quality molded product.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 and 2.

That is, since the present invention is characterized by the clamp mechanism for clamping the fabric body 1, only the clamp function will be described, and other structures (such as a vacuum forming die) are different from the conventional ones. Since it does not exist, its explanation is omitted.

That is, 4a and 4b are the lower clamp frame and the upper clamp frame similar to those shown in the conventional example, and the upper clamp frame 4b.
Is moved up and down by the driving force of the drive gear 13, whereby the fabric body 1 can be clamped. This lower clamp frame 4a
A roll bar 16 rotatably supported by a support shaft 15 is arranged in a rectangular shape on the respective clamp surfaces of the upper clamp frame 4b so as to sandwich the periphery of the fabric body 1.

Therefore, the fabric body 1 has roll bars arranged above and below them.
Since the fabric body 1 is held by the roll bars 16, the thickness direction of the fabric body 1 is held by the pair of upper and lower roll bars 16, and the width direction of the fabric body 1 is rotated by the roll bar 16 so that the fabric body 1 is rotated. Since the extension of the mold 1 is allowed, the protrusion 5'of the mold 5 comes into contact with the cloth body 1 held by the upper and lower roll bars 16 as shown in FIG. When the portion of the fabric body 1 is stretched by 5 ', the free rotation of the roll bar 16 allows the fabric body 1 to be partially stretched, so that the fabric body 1 easily fits to the mold surface of the mold 5 and is impossible. Since it is possible to suppress the occurrence of partial stretching force and the like, it is possible to mold a good quality molded product.

As an example of the roll bar 16 provided above and below, the embodiment shown in FIG. 2 can be considered. That is, as shown in FIGS. 1 and 2a, a long roll bar 16 is arranged and used for each side, or FIGS. 2b and 2b are used.
As shown in FIG. 2c, a plurality of short roll bars 16a or 16b divided in the longitudinal direction are used in combination, or as shown in FIG. 2d, provided on the upper clamp frame 4b and the lower clamp frame 4a. The roll bar 16c and the roll bar 16d may have different lengths. By using the short roll bar as described above, it is possible to perform the stretching effectively corresponding to the partial and complicated deformation of the fabric body that occurs during the formation of the fabric body.

[Effect of device]

As described above, according to the present invention, the sheet 1 made of a thermoplastic resin that is sucked by the vacuum forming die 5 and vacuum formed is disposed above the vacuum forming die 5 and the base frame 4a is provided below the sheet 1.
Is provided with a moving frame 4b on the upper side so as to correspond to the both frames 4a, 4b, and a rotatable roll 16 for holding the sheet 1 is pivotally supported by the both frames 4a, 4b, and the sheet 1 is roll-rolled. According to this, the sheet 1 is a rotary roll, that is, a roll bar 16 because the vacuum forming machine moves the both frames 4a and 4b sandwiched via 16 to the vacuum forming die 5 to form the sheet 1. Sheet 1 because it is held by
In the thickness direction of the cloth 1, the roll bars 16 are paired with each other, and the cloth body 1 is held in the width direction of the cloth body 1 by the rotation of the roll bar 16 so that the cloth body 1 can be stretched.
Since the sheet 1 is easily allowed to partially expand corresponding to the concave-convex mold surface of the vacuum forming mold, the sheet 1 easily fits into the mold surface of the mold 5 and suppresses generation of an unreasonable partial expansion force. It is possible to mold a high quality molded product.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a clamp mechanism according to an embodiment of the present invention, and FIGS. 2 (a), (b), (c) and (d) are explanatory views showing each embodiment of a roll bar. 3 to 6 are explanatory views of a conventional example. 15 …… Spindle 16,16a, 16b, 16c, 16d …… Roll bar

Claims (1)

[Scope of utility model registration request] 1. A sheet (1) made of a thermoplastic resin which is sucked into a vacuum forming die (5) and vacuum formed is disposed above the vacuum forming die (5), and the sheet (1) is placed under the sheet (1). The base frame (4a) is on the side and the moving frame (4b) is on the upper side.
a, 4b) are provided in correspondence with each other, and a rotatable roll (16) for holding the seat (1) is pivotally supported by the both frames (4a, 4b), and the seat (1) is held by the roll (16). A vacuum forming machine, characterized in that the both frames (4a, 4b) held between the two are moved to the vacuum forming die (5) to form the sheet (1).