JPH0563822U - Clamp of synthetic resin sheet in molding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a clamp having a simple structure, which can securely clamp an end portion of a synthetic resin sheet without causing a bent portion. In a molding machine configured to mold a synthetic resin sheet with the edge of the synthetic resin sheet sandwiched between the clamps 10, one side of the synthetic resin sheet of the clamp 10 is formed. In addition, the substantially corrugated ridge 11 having a constant width and a height larger than this width is integrally formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clamp attached to a molding machine that molds a synthetic resin sheet to convey and support the synthetic resin sheet.

[0002]

[Prior Art]

 Molding is performed on a synthetic resin sheet. For example, in a compressed air molding machine, as shown in FIG. 9 or 10, the end portion of the synthetic resin sheet is clamped to perform molding by a mold. Is becoming 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 perform accurate positioning with respect to the mold, clamp the end of the synthetic resin sheet. It is supposed to be sandwiched by.

As shown in FIG. 10, a general clamp often uses a pair of clamp members that sandwich a synthetic resin sheet from both sides (first case). As shown in Fig. 9, one is simply a flat plate material, and the other is sometimes used with a pointed object such as a protrusion. 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 sandwich and release the synthetic resin sheet, and the other protrusion itself is simply clamped. There is a case (second case). In the following description, the term "clamp" includes the clamps in both cases.

In a conventional compressed air 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 the mold is pressed against it. In addition, as shown in FIG. 11, the linear convex strip (in the second case) formed on the inner surface of the mold side increases the force applied to the synthetic resin sheet. Of course, as shown in FIG. 10, the force applied to the synthetic resin sheet may be increased by the linear convex strip formed on the inner surface of either clamp (first case). ..

By the way, although such a ridge ensures that the synthetic resin sheet is clamped by the mold or the clamp, the deformation due to the ridge occurs at the end portion of the synthetic resin sheet, as shown in FIG. Alternatively, 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 step, so-called trimming, becomes difficult. In a general molding machine, a large number of processes are performed on a synthetic resin sheet according to the shape of the product (for example, a plate or cup) at the same time, and then each product is synthesized at another location such as a trimming machine. It is designed to be separated from the resin sheet individually, and in this 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. This is because the In that case, if there is a bent portion shown in FIG. 12 at the end of the synthetic resin sheet, it is almost impossible to pinch it accurately.

Further, if there is a bent portion at the end portion of the synthetic resin sheet, that portion will become very large. In particular, the end of this type of synthetic resin sheet is often collected as material again after the product is completed by the molding machine, but the end has a bent portion and is voluminous. In that case, the recovery would be very troublesome.

Therefore, what should the inventors of the present invention do is to sandwich the synthetic resin sheet so as not to further bend the portion while fully utilizing the merit of the fixing by the convex strip at the time of sandwiching. As a result of repeated studies on such a matter, the present invention has been completed.

[0008]

[Problems to be solved by the device]

 The present invention has been made in view of the above circumstances, and the problem to be solved is 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 that can securely clamp an end portion of a synthetic resin sheet without causing a bent portion.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the means adopted by the present invention will be described by omitting the reference numerals used in the embodiments. “In the state where the end edge of the synthetic resin sheet 20 is clamped by the clamp 10, In a molding machine 30 configured to mold a resin sheet 20, a side surface of one of the clamps 10 made of the synthetic resin sheet has a certain width and a height larger than this width is substantially constant. This is a clamp 10 "characterized in that a wavy ridge 11 is integrally formed.

As shown in FIG. 10, when the clamp 10 is composed of a pair of clamp members for sandwiching a synthetic resin sheet from both sides thereof (first case), the clamp member is used. The ridges 11 are formed on the side surface of either one of the synthetic resin sheets 20, and in the case shown in FIG. 9 (second case), the ridges 11 are formed on the other protrusion. It is a thing. In addition, "substantially corrugated shape" mainly expresses that it is not a straight line state, for example, not only "corrugated shape", but also "zigzag" shape or "rectangle" And so on.

Further, in this case, if the thickness of the synthetic resin sheet 20 to be clamped is about 0.1 to 0.9 mm, the width of the ridge 11 is 1 to 1. 5 mm is suitable. The corrugated pitch of the ridges 11 shown in FIG. 3 is preferably 30 to 50 mm, and if it is smaller than 30 mm, the processing cost increases, and if it is larger than 50 mm, it is difficult to obtain a substantial effect. It will be. Furthermore, the height of the corrugations of the ridges 11 shown in FIG. 3 is preferably about 2 to 5 mm, and if it is less than 2 mm, the ridges 11 become close to a straight line and the substantial effect cannot be obtained. If it is larger, it is necessary to secure a large portion for clamping at the end of the synthetic resin sheet 20, which leads to a high cost of the product, which is not preferable.

[0013]

[Function of the device]

 The synthetic resin sheet 20 sandwiched by the clamps 10 as described above is in a state in which the ridges 11 bite into it, so that the molding machine 30 side is attached to the end portion where the synthetic resin sheet 20 is sandwiched. Even if tension due to the mold or the like is applied in the central direction of the synthetic resin sheet 20, the synthetic resin sheet 20 is not removed from the clamp 10. Therefore, the synthetic resin sheet 20 sandwiched between 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 being bitten into the end portions of the sandwiched synthetic resin sheet 20, the end portions of the synthetic resin sheet 20 are not shown in FIGS. Alternatively, the recess having the shape as shown in FIG. 6 is continuously formed, but the recess does not cause a bent portion at the end of the synthetic resin sheet 20. The reason is that, unlike the linear shape, the recess has a substantially corrugated shape, so that the stresses remaining in the end portions of the synthetic resin sheet 20 cancel each other out, and the synthetic resin sheet as a whole. The bent portion as shown in FIG. 12 is not generated at the end portion of the sheet 20 for manufacturing. 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 wavy shape based on a circle as shown in FIG. 1, FIG. 4 or FIG. It can be easily formed by using a cutting tool or the like. Of course, even if each of the ridges 11 has a “zigzag” shape or a “rectangular shape” that is alternately continuous, it can be easily formed by the general tool as described above.

[0016]

【Example】

 Next, the 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 10 according to a first embodiment of the present invention, and the ridge 11 is formed as a so-called sine curve. Therefore, if the ridge 11 is formed by a numerical control processing machine, it can be extremely easily cut and formed on the inner surface side of the clamp 10.

As shown in FIG. 10, when the clamp 10 is composed of a pair of clamp members that sandwich a synthetic resin sheet from both sides thereof (first case), the clamp member The ridges 11 are formed on the side surface of one of the synthetic resin sheets 20, and the ridges 11 are formed on the other protrusion in the case shown in FIG. 9 (second case). .. Therefore, the side facing the clamp 10 shown in FIG. 2 having such a ridge 11 may be provided with a groove corresponding to the ridge 11. There is no problem even if the side surface of the synthetic resin sheet 20 of the member on the side opposite to is a flat surface.

Second Embodiment FIGS. 4 to 6 show a second embodiment of the present invention, in which the shaded portion in FIG. 4 is the ridge 11. This ridge 11 is formed by forming a strip-shaped protruding portion on the inner surface of the clamp 10 and alternately cutting the strip-shaped portion from both sides in a half-moon shape. It is much easier to form than the sinusoidal one shown in 1.

In the synthetic resin sheet 20 sandwiched by the ridges 11 as described above, a relatively irregular groove is formed at its end. The residual stress due to this groove is shown in FIG. As in the case of the ones, they completely cancel each other out without any problems.

Third Embodiment FIGS. 7 and 8 show a third embodiment of the present invention, in which the ridge 11 is formed by the same method as in the second embodiment. is there. In this embodiment, a large number of protrusions 11 are formed in the width direction of the clamp 10, so that the clamp 10 can be used as a sheet for conveying the synthetic resin sheet 20. It is the one.

[0022]

[Effect of the device]

 As described above, in the present invention, as illustrated in each of the above-described embodiments, one of the clamps 10 has a certain width on the side surface of the synthetic resin sheet 20, and a height larger than this width. The characteristic feature of the structure is that the ridges 11 having a substantially corrugated shape are integrally formed, and by this, the end portions of the synthetic resin sheet can be clamped reliably and without any bent portion. The clamp can be provided with a simple structure.

[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 seen 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 as seen 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 sectional view taken along line D-D in FIG. 7.

FIG. 9 is a process cross-sectional view illustrating a schematic configuration of a molding machine in an example that employs a compressed air 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 conventional mold-side protrusions or clamps.

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

[Explanation of symbols]

 10 Clamp 11 Convex Strip 20 Synthetic Resin Sheet 30 Forming Machine

Claims (1)

[Scope of utility model registration request] 1. A molding machine configured to perform mold forming on a synthetic resin sheet in a state where an edge of the synthetic resin sheet is clamped by the clamp, wherein one of the clamps is made of the synthetic resin. A clamp characterized in that a substantially wave-shaped ridge having a constant width and a height larger than this width is integrally formed on the side surface of the sheet-making sheet.