JPH0752405Y2 - Clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is provided with a plurality of clamps for holding a peripheral edge portion of a molding material when a molding material is press-molded between a pair of upper and lower molding dies. Each clamp has a pair of clamp claws pivotally attached to each other, and these clamp claws are a claw tip part that clamps and clamps the peripheral edge of the molding material by a spring force, and a pair of clamp claws. A claw rear end located on the opposite side of the claw tip with respect to
Each clamp relates to a clamp device that is biased in a direction to pull the molding material with the pair of clamp claws sandwiching the peripheral edge of the molding material.

[Prior Art] When a molding material such as a thermoplastic synthetic resin sheet, a carpet, or a laminated material of both of them is press-molded, it is conventionally known that the peripheral portion of the molding material is clamped by a clamp device of the above type.

More specifically, for example, when a carpet lined with a synthetic resin sheet layer is molded by a pair of upper and lower molds along the uneven vehicle floor surface, as shown in FIG. The peripheral portion of the is clamped by the clamp 4, the clamp 4 is connected to the surrounding frame 6 via the spring 5, after heating the carpet to a predetermined temperature, it is inserted between the upper mold 1 and the lower mold 2. , Both molds 1 and 2 are clamped and press molded. At this time, the circumference of the carpet 3 is pulled by the spring 5. When the molds 1 and 2 are clamped, the carpet 3 is drawn toward the center of the mold because it follows the molding surface of the mold. The tension of the spring 5 is adjusted so that the carpet 3 is appropriately tensioned. That is, if the carpet is pulled in more than necessary, wrinkles may occur in the molded product. Conversely, if the force of the spring 5 is strong and the length pulled in is small, the carpet will be extremely stretched and thinned, or even partially. This is because there is a possibility of breaking.

As described above, the clamp holds and clamps the peripheral edge of the molding material. However, if the clamp is pulled between the molding dies, the clamp may be broken during mold clamping.

Therefore, a clamp device has been proposed which is provided with a stopper that can come into contact with the end surface of the mold to prevent the clamp from being drawn into the mold during molding of the molding material (Japanese Utility Model Publication No. 1-26484). reference).

However, according to the above-mentioned clamp device, although the problem that the clamp is pulled into the mold and damaged is eliminated, after the stopper contacts the mold, the pulling of the molding material into the mold is prevented, The molding material may break to the clamp holding position. In addition, it is necessary to release the clamp from the molding material after the molding is completed and remove it, which inevitably causes a problem that workability is deteriorated.

[Problems to be solved by the invention]

An object of the present invention is to propose a clamp device which eliminates the above-mentioned conventional drawbacks by a simple structure.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a clamp device of the type described at the beginning, in which a clamp rotatably attached to at least one of a pair of clamp claws. The clamp release member has a release member, and when the molding material is drawn toward the center of the mold during molding and the clamp comes close to the mold by a predetermined distance, the clamp release member comes into contact with the mold to form the mold. The releasing member tip end portion that receives a reaction force from the mold and the pivoting portion of the clamp releasing member with respect to the clamp claw are located on the opposite side of the releasing member tip end portion, and the releasing member tip end portion is caused by the reaction force received from the molding die. When the clamp release member rotates about its pivotal portion, the claw rear end of the clamp pawl is pressed to rotate the clamp pawl about its pivotal portion, and the pair of clamp pawls A clamping device having a releasing member rear end portion for releasing the clamping of the molding material is proposed.

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

FIG. 1 is a sectional view showing an example of this invention. The molding material 3 is stretched by a clamp device having left and right clamps 21, and the clamp 21 is connected to an outer frame (not shown) via a coil spring 31 locked to one end of the pair of clamp claws 22. ing. FIG. 1 shows a first stage of molding, in which a molding material 3 kept at a predetermined temperature is inserted between an upper mold 1 and a lower mold 2. Thus, the illustrated clamping device is provided with a plurality of clamps 21 that hold the peripheral edge of the molding material 3 when the molding material 3 is press-molded between the pair of upper and lower molding dies.

FIG. 2 is a diagram showing a second stage of molding, but before describing the details thereof, the configuration of the clamp device will be more specifically clarified with reference to this diagram. Each clamp 21 has a pin 40
The above-mentioned pair of clamp claws 22 pivotally attached to each other through the clamp claws 22 are provided.
Claw tip 41 that clamps and clamps the peripheral edge of the molding material 3 by the spring force of the claw, and the pivotal attachment part of the pair of clamp claws 22, that is, the claw rear end located on the side opposite to the claw tip 41 with respect to the pin And a section 42. Teeth are formed on portions of the claw tip portions 41 facing each other, and both teeth are engaged with the molding material 3 by the pressing action of the torsion spring 26, and the molding material 3 is clamped by being clamped. As described above, the coil spring 31 is connected to one of the clamp claws 22, so that each clamp 21 can be molded with the pair of clamp claws 22 sandwiching the peripheral edge of the molding material 3. It is urged to pull 3.

Further, the clamp device has a clamp release member 23 rotatably pivotally attached via a pin 43 to at least one of the pair of clamp claws 22 of each clamp 21. In this embodiment, a clamp release member 23 is attached to both clamp claws 22 of each clamp 21, and each clamp release member 23 is pivotally attached to the center of the back surface of each clamp claw 22 by a pin 43. Each clamp release member 23, the release member tip portion 24,
It has a pivotally attached portion of the clamp releasing member 23 to the clamp claw 22, that is, a releasing member rear end portion 25 located on the opposite side of the releasing member tip end portion 24 with respect to the pin 43.

Here, as described above, FIG. 2 is a diagram showing the second stage of the molding, and the main points when the upper and lower molds 1 and 2 approach from the state shown in FIG. 1 by a hydraulic device (not shown). It is the figure which expanded and showed the part. When the upper and lower molds 1 and 2 come close to each other, the molding material 3 follows the irregularities of the upper and lower molds 1 and 2, so that the molding material 3 is dragged toward the center of the mold, and thus the release member tip of the clamp release member 23 pivotally attached to the clamp 21. The part 24 contacts the side surfaces of the upper and lower molds 1 and 2. In this way, when the molding material 3 at the time of molding is drawn toward the center of the molding die and the clamp 21 comes close to the molding die by a predetermined distance, the releasing member tip portion 24 abuts on the molding die. As a result, the tip portion 24 receives a reaction force from the molding die.

FIG. 3 is a view showing a third stage of molding, and is a sectional view of an essential part showing a state where the upper and lower molds 1 and 2 are closer to each other from FIG. The molding material 3 is further dragged into the molding die, and the releasing member tip portion 24 is moved by the reaction force received from the molding die in the direction away from the clamp claw 22 along the side surface of the molding die, and the clamp releasing member 23 is pinned. Rotate around 43. As a result, the release member rear end portion 25 presses the claw rear end portion 42 of the clamp claw 22.

FIG. 4 is a cross-sectional view of essential parts showing the final stage of molding. When the upper and lower molds 1 and 2 come close to a predetermined position for compressing the molding material 3 and the molding material 3 is dragged into the mold as close as possible, the releasing member rear end portion 25 of the clamp releasing member 23 is released. The claw rear end 42 of the clamp claw 22 is pressed against the force of the torsion spring 26, so that the teeth of the claw tip 41 of the clamp claw 22 open each other and the molding material 3 is released from the clamp 21. Then, the upper and lower molds 1 and 2 are clamped at predetermined positions to complete the molding.

As described above, when the clamp releasing member 23 is rotated around its pivotal portion, that is, the pin 43, by the reaction force received by the releasing member distal end portion 24 from the mold, the releasing member rear end portion 25.
Is applied to the clamp claw 22 by pressing the claw rear end 42 of the clamp claw 22.
Is rotated around its pivotal portion, that is, the pin 40, and the clamping of the molding material 3 by the pair of clamp claws 22 is released.

According to the above configuration, when the molding material 3 needs to be clamped, the clamp 21 securely clamps the peripheral edge portion of the molding material 3 to clamp it, and when the clamp 21 approaches the molding die. Since the releasing member tip portion 24 of the clamp releasing member 23 pivotally attached to the clamp 21 contacts the molding die, there is no possibility that the clamp 21 is pulled between the molding dies and is damaged. Moreover, the release member tip end portion 24 comes into contact with the molding die and receives a reaction force from the molding die, whereby the clamp release member 23 rotates, and the release member rear end portion 25 causes the claw rear end portion 42 of the clamp pawl 22 to move. Since the pressure is applied to release the clamping of the molding material 3 by the pair of clamp claws 22, there is no possibility that an excessive external force is applied to the molding material 3 and the molding material 3 is broken. Further, since the molding material 3 is not pulled extremely by the clamp claws 22, the traces of the molding material 3 attached to the molding material 3 by the claw tips 41 are also small, and when the molding material 3 is fibrous, It is also possible to use this as the peripheral edge of the product as it is without trimming.

In addition, since the clamp 21 is released from the forming material 3 at the end of molding, it is not necessary to release the clamp 21, and workability is improved.

Further, the structure of the clamp device is extremely simple, and the clamp device operates reliably, and the cost thereof can be reduced.

Although the drawings showing the above embodiment show one cross section, the clamp 21 to which the clamp release member 23 is pivotally attached is
A large number of them are installed around the molding material 3 before molding, and the distance from each mold side surface and the strength of the coil spring 31 are appropriately adjusted depending on the shape and material to be molded.

Further, in the above embodiment, the clamp releasing member 23 is provided on both of the pair of clamp claws 22, but when the molding material at the time of molding is a material having relatively high rigidity, the clamp release is performed on only one clamp claw 22. It suffices to provide only the member 23,
As explained earlier.

Examples of the material to be molded in the present invention include a thermoplastic synthetic resin sheet, a fiber material, a felt, and a multi-layer material obtained by combining these materials. Further, the clamp device according to the present invention mounts a preformed synthetic resin molded product, a molded product containing a synthetic resin, or the like as a base material on the lower mold of a pair of upper and lower molds, and if necessary on the surface thereof. After applying the adhesive accordingly, it can also be adopted when press-molding the molding material between the molding dies and simultaneously adhering the molding material and the substrate.

[Advantage of the Invention] According to the present invention, when the molding material needs to be clamped, the clamp securely clamps the peripheral edge of the molding material and clamps it, and the clamp comes close to the molding die. At this time, since the tip end of the release member of the clamp release member pivotally attached to the clamp comes into contact with the mold, there is no risk that the clamp will be pulled between the molds and damaged.

Moreover, when the tip of the releasing member comes into contact with the molding die and receives a reaction force from the molding die, the clamp releasing member rotates,
The release member rear end pressurizes the clamp claw rear end,
Since the clamping of the molding material by the pair of clamp claws is released, an excessive external force is applied to the molding material so that the molding material is not broken.

Further, since the molding material is not pulled extremely by the clamp claws, traces of the molding material by the tip of the claw are also slight.

Moreover, since the clamp is released from the molding material at the end of molding, there is no need to release the clamp.
Workability is improved.

Further, the structure of the clamp device is extremely simple, and the clamp device operates reliably, and the cost thereof can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the present invention, showing a first stage of molding, and FIGS. 2 to 4 are cross-sectional views of a main part showing the second to fourth stages of molding in that order. And, FIG. 5 is a sectional view showing a conventional example. 3 ... Molding material, 21 ... Clamp 22 ... Clamping claw, 23 ... Clamp releasing member 24 ... Releasing member tip end portion, 25 ... Releasing member rear end portion 41 ... Claw tip end portion, 42 ... Claw rear end portion

Claims (1)

[Scope of utility model registration request] 1. When a molding material is press-molded between a pair of upper and lower molding dies, a plurality of clamps for holding the peripheral edge of the molding material are provided, and the clamps are pivotally attached to each other. It has a pair of clamp claws, and these clamp claws have a claw tip that clamps and clamps the peripheral edge of the molding material by a spring force, and a pair of clamp claws that are opposite to the claw tip on the pivotal attachment part. Each clamp has a rear end portion of a pawl positioned at, and each clamp has a pair of clamp pawls sandwiching a peripheral edge portion of the molding material, and the clamp device is urged in a direction to pull the molding material. A clamp release member pivotally attached to at least one of the clamp claws of the mold, the clamp release member having a molding material drawn toward the center of the mold during molding, and the clamp In contrast to When it comes close to the distance of, the releasing member tip end portion which is in contact with the forming die and receives the reaction force from the forming die and the pivoting portion of the clamp releasing member with respect to the clamp claw is located on the opposite side of the releasing member end portion. And when the clamp releasing member pivots around its pivoting portion due to the reaction force of the releasing member tip end from the molding die, presses the claw rear end portion of the clamping pawl to pivotally attach the clamping pawl. And a releasing member rear end portion for releasing the clamping of the molding material by the pair of clamping claws around the portion.