JPH029947Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a clamping device for resin sheets cut into monoplane shapes, and is used to clamp one or two sides of cut resin sheets formed by a mold of a molding machine. It is an object of the present invention to provide a clamp device that can move one or two sides of the sheet downward or upward from a supply line as it moves.

(Prior art) The four peripheral sides of a resin sheet coated with plastic resin on at least one side and cut into a predetermined shape are supported by each of a plurality of clamping and transferring means that are free to move in a predetermined direction. A device for clamping at intervals using clamping tools is known as described in Japanese Patent Publication No. 49-27099. However, this method has a complicated structure and is expensive to produce, so it has not been put to practical use other than manufacturing extremely large products made of cloth coated with resin.

However, as shown in FIGS. 5 and 6, girdle-shaped or gutter-shaped molded products are actually produced. As an example, to explain the case of molding the ginkgo-shaped molded product shown in FIG. 5, FIG. As shown in , a concave depression mold b is provided in the mold a, and the four sides of the resin sheet s cut into a single leaf shape are gripped by a clamp frame K, and vacuum is applied.
The resin sheet is molded (c) in close contact with the mold surface of the hollow mold (b) using compressed air or other molding means, and after being removed from the mold, it is cut off from the chain line (e).
There is a disadvantage that not only the percentage of material loss of the cut-off resin sheet s becomes extremely large, but also the thickness of the bottom portion d becomes thin.

Furthermore, in order to mold the sheet molded products illustrated in FIGS. 5 and 6 using the concave mold of the lower die 21 illustrated in FIG. 3, the configuration shown in FIG. 8 is used because the movable clamp is moved by a lever. ing. In the case shown in Fig. 8, a lever support plate g is fixed to the lower end of a hanging piece f that is attached to a molding machine and suspended, and the shaft k of a lever j is freely moved through a horizontal floating hole h of the support plate g. In addition, an auxiliary lever m is provided on the shaft l at a position substantially horizontally corresponding to the floating hole h, and the auxiliary lever m is connected to the middle of the length of the lever j, and the auxiliary lever m is returned between the connected portion and the upper part of the hanging piece g. A spring n is applied, a pair of links q with a movable clamp o attached to the tip of a lever j are connected together, and one side of the resin sheet s is gripped by the movable clamp o. Elevation and descent to the level shown is allowed by the harmonic movement of lever j, sublever m, and return spring n. However, since the configuration shown in FIG. 8 has nothing to do with the clamp frame, the installation height of the hanging piece f must be adjusted, and the structure becomes larger.
It cannot avoid drawbacks such as complexity.

(Problems to be Solved by the Invention) The present invention can produce resin sheet molded products as shown in Figs. 5 and 6 without causing much material loss as explained in Fig. 7, and This is an easy-to-manufacture method that allows the four sides of a cut resin sheet to be gripped to a single clamp frame without using a device unrelated to the clamp frame, and allows the position-variable clamp to be moved according to the shape of the mold. The idea was to develop a structure.

(Means for Solving the Problems) The clamping device for cut resin sheets of the present invention aims to solve the problems mentioned in the previous section. A position-fixing clamp 3 and one end supported on the shaft 7 of the remaining two edges or one edge of the clamp frame 1 so that the free end can be approximately at the same level as each edge of the clamp frame 1, and the free end can be pivoted. 7, a variable position clamp 9 for the free end of the lever 8 that can be moved upward or downward, and a clamp frame 1 for the free end of each lever 8.
A concave or convex mold having a part surrounding a molding reference surface whose four circumferences are at the same level as in the past. This clamp device is compatible with a mold that has a basic form in which the mold reference plane is two or three sides of the cut resin sheet and the remaining one or two sides are lowered from the mold reference plane. be.

A preferred embodiment of the invention will now be described.

(Example) The attached drawing shows an example of a clamping device in which three sides of a cut resin sheet, which is to be cut into a rectangular shape, are gripped by fixed position clamps, and the remaining side is gripped by a position variable clamp. As shown in Figs. 1 to 3, the clamp frame 1 is made by cutting two parallel edges 2 _-1 and 2 _-3 on opposite sides of the resin sheet S.
S _-1 , longer than S _-3 and two other parallel edges 2 _-2 , 2 _-4
, the other two opposing sides S _-2 of the cut resin sheet S,
It is made into a rectangular shape with a length adapted to the length of sheet S _-4 , and the edges 2 _-2 and parts of edges 2 _-1 and 2 _-3 that are in contact with the edge are connected to the sides S _-1 and S of the sheet S. _-2 , S _-3 are provided with position fixing clamps _3-1 , _3-2 , and _3-3 that grip them at intervals,
The other edge 2 _-4 is provided with the upper ends of a plurality of links 6 fitted into the shaft 5 supported by the shaft support pieces 4 and 4 provided on the edges 2 _-1 and 2 _-3 , and the lower end of each link is provided with a shaft. 7
Attach one lever 8 with the free end facing the edge 2 _-2 , and attach a seat S to the free end of each lever.
Attach the variable position clamp 9 that grips the remaining side S _-4 of the. 10 are two parallel edges 2 of the clamp frame 1 _-
1 and 2 _-3 to restrict the upward swinging of each lever 8, and the sheet gripping surface of the variable position clamp 9 attached to each lever 8 is fixed in position by the ruler plate 10. Clamps _3-1 to _3-3 should not be able to move upward beyond the level of the sheet gripping surfaces.

Each of the above-mentioned position fixing clamps does not change the position after gripping the cut resin sheet S,
It is also possible to change the mounting position by moving on the clamp frame 1 before gripping.

Each lever 8 is provided with a first spring 11 that pulls the link 6 against the inner surface of the edge _2-4 until it becomes substantially vertical, and a second spring 12 that pulls the lever upward until it hits the ruler plate 10. The first spring 11 and the second spring 12 are fixed in position by the combined elasticity of the clamp 3.
_-1 to 3 _-3 and the variable position clamp 9 are held at the same level to enable the cut resin sheet S to be gripped.

The shaft 7 is a common shaft connecting each link 6 and the lever 8, and the first spring 11 and the second spring 12 are connected to each other.
It is also possible to have one each.

As the fixed position clamp and the variable position clamp, various conventionally used resin sheet clamps are used.

The molding machine using the clamping device exemplified above is one in which one of the recessed molds 23 provided in the lower mold 21 is released to fit the winnowing molded product shown in FIG. It forms a convex mold 24 that fits into the hollow mold 23, and the vertical surface 25 on one side has a shape that complements the open surface of the hollow mold 23 of the lower mold 21.

In this embodiment, the position fixing clamp 3 _-1 ~
3 _-3 was held at the same level as the variable position clamp 9, and each side S _-1 to _{S -4} of the cut resin sheet S was grabbed and moved downward and upward using a cylinder etc. as shown in Fig. 3. After inserting the clamp frame 1 between the lower mold 21 and the upper mold 22, as shown in FIG. 5, the lower mold is raised and the upper mold 22 is lowered to perform molding. At this time, the clamp frame 1 does not move, but the side S _-4 of the cut resin sheet S pressed by the upper mold 22 falls to the release surface of the hollow surface 22 of the lower mold 21, and the lever 8 adapts to the pressing of the resin sheet S. The side S -4 of the sheet S is lowered together with the free end of the lever 8 to assist in forming without releasing the grip on the side S _-4 of the sheet S by the variable position clamp 9. At this time, the link 6 also swings as shown to prevent the variable position clamp 9 from moving too far away from the release surface of the recess mold surface 23 of the lower mold 21. This saving is due to the elasticity of the cut resin sheet S to resist stretching by the mold.

(Operation of the present invention) In the present invention, a fixed position clamp 3 for gripping two or three sides of a cut resin sheet is attached to a clamp frame, and a variable position clamp 9 for gripping the remaining two or one side is attached to the clamp frame. The springs 11 and 12 are attached to the free end of a lever whose one end is pivotally supported on the frame, and the variable position clamp is at the same level as the fixed position clamp, allowing the cut resin sheet to be gripped. When molding is performed using a mold with a flat or convex mold surface, when the cut resin sheet is pushed down or pushed up by the mold, the lever pivoted on the clamp rod 1 swings in response to the pressure. Then, the variable position clamp is displaced.

(Effects of the Invention) The present invention enables molding due to the above-described effects, and since not all clamps are attached to the lever 8, manufacturing becomes easy. Furthermore, since the edges of the cut resin sheet gripped by the variable position clamp 9 will be irregularly shaped, that portion must be cut, but the loss of sheet material due to such cutting cannot be avoided by conventional molding as shown in Fig. 7. In addition, the drawback that only the bottom part is stretched significantly and the wall thickness is thinned is significantly reduced by the swinging of the lever and the movement of the variable position clamp. Motsu.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a perspective view of the clamp frame 1, Figure 2 is a plan view illustrating the invention, and Figure 3 is a longitudinal sectional side view of the same, showing the lower mold and A longitudinal cross-sectional side view of the upper die is also shown. FIG. 4 is a longitudinal sectional side view illustrating the forming operation. 5 and 6 are perspective views illustrating a molded product, FIG. 7 is a vertical side view of a conventional mold, and FIG. 8 is a drawing of a conventional structure using a lever with a movable clamp. 1 → Clamp frame, 2 _-1 ~ 2 _-4 → Edge, S → Cut resin sheet, S _-1 ~ S _-4 → Side, 3 _-1 ~ 3 _-4 → Fixed position clamp, 8 → Lever, 9 → Position Variable clamp, 13 → elastic means.

Claims (1)

[Scope of utility model registration request] A position fixing clamp 3 on two or three edges of the clamp frame 1, and a free end supported on the shaft 7 of the remaining two edges or one edge of the clamp frame 1, and a free end on each edge of the clamp frame 1. a variable position clamp 9 for the free ends of the levers 8 which can be brought to approximately the same level as the respective edges of the clamping frame 1 and whose free ends can be moved above or below the shaft 7; A clamping device for cut resin sheets, characterized by comprising a spring that can be pulled by.