JP2516904Y2 - Clamp of synthetic resin sheet in molding machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp attached to a molding machine for molding a synthetic resin sheet to convey and support the synthetic resin sheet.

[0002]

2. Description of the Related Art For example, in a pneumatic molding machine for molding a synthetic resin sheet, as shown in FIG.
As shown in FIG. 5, the ends of the synthetic resin sheet are clamped by clamps, and the sheet is molded.
That is, if the position of the synthetic resin sheet shifts during transportation or pressing by the mold, efficient molding cannot be performed. Therefore, in order to accurately position the synthetic resin sheet with respect to the mold, the ends of the synthetic resin sheet are clamped by clamps. I am doing so.

As a general clamp, as shown in FIG. 10, use a clamp composed of a pair of clamp members for sandwiching a synthetic resin sheet from both sides (first case).
However, as shown in Fig. 9 , the clamp is
One of which formed a single-made flat plate member, and the other formed
It pointed also Noto, such as collision force formed on the molding surface side of the form type
One in which there is to Rukoto. In the case of the clamp as shown in FIG. 9, the other protrusion moves forward and backward with respect to one plate material to hold and release the synthetic resin sheet, and the other protrusion itself is simply clamped. There is a case (second case). In the following description, when simply saying “clamp”, these first and second
It is intended to include the clamping of the two cases.

In a conventional pressure molding machine in which this type of clamp is used, in order to prevent the synthetic resin sheet once clamped by the clamp as described above from coming off from the clamp when pressure is applied by a mold to it. As shown in FIG. 11, the linear protrusion formed on the inner surface of the mold
By raising (in the second case), the force applied to the synthetic resin sheet is increased. Of course, the first case good urchin of shown in FIG. 10, the linear projections formed on either the inner surface of both clamp members, also be made to increase the force applied to the synthetic resin sheet .

Meanwhile, depending on such projections, type or clamping the synthetic resin sheet by the clamp is intended to become surely deformed by the projection occurs in the end portion of the synthetic resin sheet, FIG. 11 or, In some cases, the bending as shown in FIG. 12 occurs at the end of the synthetic resin sheet. When such a bent portion is formed on the synthetic resin sheet, it is inevitable that individual taking out of the product in the next stage, so-called trimming, becomes difficult. In a general molding machine, a large number of processes are performed on a synthetic resin sheet at the same time according to the product shape (for example, a plate or cup), and then each product is processed at a different location such as a trimming machine. The synthetic resin sheet is individually separated, and in that case as well, in order to trim each product from the synthetic resin sheet at the correct position, the edges of the synthetic resin sheet are clamped for conveyance and positioning. Because it must be done. In that case, if the end portion of the synthetic resin sheet has a bent portion shown in FIG. 12, the pinching can be hardly performed.

Further, if there is a bent portion at the end of the synthetic resin sheet, that portion becomes very voluminous. Especially, the edge of this kind of synthetic resin sheet is
It is often collected as a material again after the product is finished by the molding machine, but if the end has a bent portion and it becomes bulky, the collection will be very troublesome. I don't get it.

[0007] Therefore, the inventors of the present invention try to sandwich the synthetic resin sheet so as not to cause a further bent portion while fully utilizing the merit of fixing by the protrusion at the time of sandwiching. As a result of repeated studies on what to do, the present invention was completed.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and the problem to be solved is the bending that occurs after the ends of the synthetic resin sheet are clamped by the clamps.

It is an object of the present invention to provide a clamp having a simple structure which can securely clamp the ends of the synthetic resin sheet without causing a bent portion.

[0010]

In order to solve the above problems BRIEF SUMMARY OF THE INVENTION, means of adopting the devised according to claim 1 is explained with reference numeral used in the examples, "synthetic resin sheet 20 The edges of the pair of clutches that move relative to each other.
The clamp 10 consisting of pump member 10a · 10a while sandwiching, in a molding machine 30 to perform the molding with respect to the synthetic resin sheet 20, clamp member
Synthetic resin sheet 2 of either 10a or 10a
The surface facing the 0 side, the first thickness of the synthetic resin sheet 20.
Having from 1 to 15 times the width, made greatly synthetic resin than the width
Having a height of 2.2 to 50 times the thickness of the sheet 20,
One substantially wave shaped projections 11 which are consecutive in a non-linear a clamp 10 'which is characterized in that integrally formed.

[0011] That is, clamp 1 according to the claim 1
0, as shown in FIG. 10, a pair of clamping member 10a · 10 for clamping the synthetic resin sheet 20 <br/> from both sides
a or Ranaru ones in the case of (first case), one of any of the clamping member 10a · 10a, the surface to be the synthetic resin sheet 20 side, the thickness of the synthetic resin sheet 20
It has a width of 1.1 to 15 times the width and is larger than this width.
Has a height of 2.2 to 50 times the thickness of the synthetic resin sheet 20.
To, and is intended to form a generally corrugated ridges 11 contiguous with non-linear. In this case, the “substantially corrugated shape” mainly means that it is not a straight line state, and it goes without saying that the “corrugated shape” is, for example, a shape in which “zigzag” shapes and “rectangles” are alternately continuous. And so on.

Further, in order to solve the above-mentioned problems, a claim
Similarly, the means adopted by the device according to the second aspect is "a synthetic resin sheath.
The edge of the board 20 is a flat plate and
And a protrusion formed on the surface of the mold that moves forward and backward
In the state of being clamped by the clamp 10 consisting of
Molding for the resin sheet 20
In the machine 30, the protrusions forming the clamp 10 are
Has a width of 1.1 to 15 times the thickness of the synthetic resin sheet 20.
However, if the thickness of the synthetic resin sheet 20 is larger than this width,
2.2 to 50 times as high and non-linear and continuous
And a ridge 11 having a substantially wavy shape.
10 " .

That is, the clamp 1 according to claim 2
0 is the other in the case shown in FIG. 9 (second case)
Of the thickness of the synthetic resin sheet 20 from 1.1 to 15
It has a double width and is larger than this width.
Has a height of 2.2 to 50 times the thickness of 0 and is non-linear
The ridges 11 are substantially wave-shaped and continuous. Of course
In theory, "generally corrugated" means that it is not a straight line.
Of course, the "wave shape" is of course
And, for example, “zigzag” shapes and “rectangles” are alternately continuous.
It is as described above that it includes a shape such as
It

[0014] In either case described above, the thickness of the synthetic resin sheet 20 to be clamp is 0.1~0.9m
If it is about m, the width of the ridge 11 is appropriately 1 to 1.5 mm, as in the conventional case. Further, the wavy pitch shown in FIG.
mm is good, and if it is smaller than 30 mm, the processing cost increases, while if it is larger than 50 mm, it becomes difficult to obtain a substantial effect. Further, the height of the corrugations of the ridges 11 shown in FIG. 3 is preferably about 2-5 mm.
If it is less than 5 mm, the ridges 11 will be close to a straight line and no substantial effect will be obtained. If it is more than 5 mm, a large portion for clamping must be secured at the end of the synthetic resin sheet 20. This leads to high cost and is not desirable.

[0015]

In any of the invention of the invention effects] on than, for synthetic resin sheet 20 which is sandwiched by click run <br/> flop 10 is made to a state of biting ridges 11 as it were, the synthetic resin At the end where the sheet 20 is sandwiched, the molding machine 3
Even if tension due to the mold on the 0 side is applied in the central direction of the synthetic resin sheet 20, the synthetic resin sheet 20 does not come off from the clamp 10. Therefore, the synthetic resin sheet 20 sandwiched by the clamps 10 having the ridges 11 is always in a stable state with respect to the molding machine 30, and the processing is accurately and surely performed.

Further, since the ridges 11 of the clamp 10 are in a state of biting into the end portions of the sandwiched synthetic resin sheet 20, the end portions of the synthetic resin sheet 20 are shown in FIG.
Although the recess having the shape as shown in FIG. 4 or FIG. 6 is continuously formed, the bent portion does not occur at the end of the synthetic resin sheet 20 due to the recess. The reason for this is that the recess is a substantially corrugated shape as opposed to a linear shape, so the synthetic resin sheet 20
The residual stresses in the end portions of the above-mentioned cancel each other out, and as a whole, the bent portion as shown in FIG. 12 does not occur at the end portion of the synthetic resin sheet 20. Therefore, the synthetic resin sheet 20 after being molded by the molding machine 30 maintains substantially flatness at its end portion, and does not cause an obstacle in the subsequent processing.

As described above, when the ridge 11 of each clamp 10 is formed as a corrugated shape based on a circle as shown in FIG. 1, FIG. 4 or FIG. 6, it is cut by rotation. By using a cutting tool or the like, it can be easily formed. Of course, each ridge 11 has a "zigzag" shape or a "rectangle".
Even if the shapes are alternately continuous, they can be easily formed by the general tool as described above.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a clamp 10 according to the present invention will be described in detail according to each embodiment shown in the drawings.

First Embodiment FIGS. 1 to 3 show a clamp 1 according to a first embodiment of the present invention.
0 is shown, and the ridge 11 is formed as a so-called sine curve. Therefore, if the ridges 11 are formed by a numerical control processing machine, the inner surface of the clamp 10 can be cut and formed very easily.

[0020] Incidentally, the clamp 10, as shown in FIG. 10, when the synthetic resin sheet 20 from both sides thereof a pair of clamping member 10a · 10a or Ranaru ones for clamping (second case one) the, the clamping member 10a · 10
The ridge 11 is formed on the surface of the synthetic resin sheet 20 on the side of any one of a. In the case (second case) shown in FIG. 9, the ridge 11 is formed on the other protrusion. To form. Therefore, as shown in FIG.
On the side facing the clamp 10 shown in FIG.
It may be carried out by forming a concave groove corresponding to the above, and the side surface of the synthetic resin sheet 20 of the member facing the clamp 10 may be a simple flat surface without any problem.

Embodiment 2 FIGS. 4 to 6 show a second embodiment of the present invention, in which the shaded portion in FIG. This ridge 1
1 is formed by forming a strip-shaped projecting portion on the inner surface of the clamp 10 and alternately performing half-moon cutting with a cutting tool on both sides of the strip-shaped portion, as shown in FIG. It is much easier to form than a sine curve.

In the synthetic resin sheet 20 sandwiched by the ridges 11 as described above, relatively irregular grooves are formed at the ends thereof, and the residual stress due to the grooves is shown in FIG. As in the case of things, they completely cancel each other out without causing any problems.

Embodiment 3 FIGS. 7 and 8 show a third embodiment of the present invention.
The ridges 11 in this case are formed by the same method as in the case of the second embodiment. In this embodiment, a large number of convex strips 11 are formed in the width direction of the clamp 10, so that the clamp 10 can also be used as a sheet for conveying the synthetic resin sheet 20. It is a thing.

[0024]

As described above, in the invention according to claim 1, as shown in each of the above embodiments, one of the clamps 10 is attached to the side surface of the synthetic resin sheet 20, and
Has a width 1.1 to 15 times the thickness of the synthetic resin sheet 20.
However, if the thickness of the synthetic resin sheet 20 is larger than this width,
2.2 to 50 times as high and non-linear and continuous
The structural feature is that the substantially corrugated ridges 11 are integrally formed. By this, the clamp which can securely clamp the end portion of the synthetic resin sheet without causing a bent portion is formed. Can be provided with a simple configuration.

Similarly, in the invention according to claim 2,
As shown in each of the above embodiments, the clamp 10 is constructed.
The protrusion of 1.1 to the thickness of the synthetic resin sheet 20.
It has a width of 15 times and is larger than this width.
Has a height of 2.2 to 50 times the thickness of
Linearly continuous and substantially wave-shaped convex strip 11 is integrally formed
The fact that it is a synthetic tree
The edge of the oily sheet is pinched securely and no bends occur.
A simple configuration provides a clamp that can be
It can be offered.

[Brief description of drawings]

FIG. 1 is a partially enlarged plan view showing a state of a clamp according to a first embodiment of the present invention viewed from a synthetic resin sheet side.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partially enlarged plan view showing pitches and wave heights of the ridges shown in FIG.

FIG. 4 is a partially enlarged plan view showing a state of the clamp according to the second embodiment of the present invention viewed from the synthetic resin sheet side.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a partially enlarged plan view showing a state of the clamp according to the third embodiment of the present invention as seen from the synthetic resin sheet side.

FIG. 8 is a cross-sectional view taken along the line D-D in FIG. 7.

FIG. 9 is a process cross-sectional view showing a schematic configuration of a molding machine in an example adopting a pressure molding method.

FIG. 10 is a cross-sectional view showing a schematic configuration of a conventional vacuum forming machine.

FIG. 11 is a partial cross-sectional view showing a phenomenon when a synthetic resin sheet is sandwiched by a conventional mold side protrusion or clamp.

FIG. 12 is a partial cross-sectional view showing a deformed state of an end portion of the synthetic resin sheet processed as shown in FIG.

[Explanation of symbols]

10 Clamp 10a Clamp member 11 Convex strip 20 Synthetic resin sheet 30 Forming machine

Claims (2)

(57) [Scope of utility model registration request] 1. The edges of the synthetic resin sheet are opposed to each other.
While clamped by clamps comprising a pair of clamping members which move, in the molding machine to perform the molding against the synthetic resin sheet, of one of the clamping member, the synthetic resin On the surface facing the sheet-making side, the thickness of the synthetic resin sheet
It has a 1.1 to 15 times the width, greatly the alloy than the width
Has a height of 2.2 to 50 times the thickness of the synthetic resin sheet
Te, and clamp, characterized in that integrally formed substantially corrugated ridges contiguous with non-linear. 2. The edge of the synthetic resin sheet is a flat plate.
Material and the plate material of the molding die that moves back and forth relative to the material
It is clamped by a clamp consisting of a protrusion formed on the side surface
Molded on this synthetic resin sheet in the closed state
In the molding machine, The protrusions that make up the clamp are connected to the synthetic resin shield.
It has a width of 1.1 to 15 times the thickness of the board,
The thickness is 2.2 to 50 times the thickness of the synthetic resin sheet.
Non-linear continuous, substantially wave-shaped ridges with height
A clamp characterized by being formed on.