WO2011078021A1

WO2011078021A1 - Rotary clamp device and film clamping method

Info

Publication number: WO2011078021A1
Application number: PCT/JP2010/072517
Authority: WO
Inventors: 成一山崎
Original assignee: 日本写真印刷株式会社
Priority date: 2009-12-25
Filing date: 2010-12-15
Publication date: 2011-06-30
Also published as: CN102652052A; JP5001467B2; TWI454360B; TW201139105A; CN102652052B; JPWO2011078021A1

Abstract

A clamp blade (3) comprises a base portion (3b) secured to a rotational shaft (2) which can be positively/negatively rotated by a driving device (1); and a front end portion (3c) which can be linearly in contact with an edge of a film (6).

Description

Rotary clamp device and film clamp method

The present invention relates to a rotary clamp device and a film clamp method mounted on a mold and driving a clamp blade that holds a transfer sheet in the mold by rotational movement.

2. Description of the Related Art Various types of clamp devices having a blade frame that is attached to a mold of an injection molding simultaneous decoration device and holds a transfer sheet film on the mold are known.

For example, the mold in the method of integrating the injection molding simultaneous decoration film has a vacuum moldable injection mold structure, and the clamp is used to press the lower end face of the film fed into the mold. It consists of one clamp and a second clamp that clamps the entire outer periphery of the product portion provided on the film cavity side mold surface for vacuum forming. The second clamp is attached to a rod sliding in the mold opening / closing direction using a clamp formed of a rectangular frame or a clamp formed in a U-shape. Then, the film is fed between the frame clamp and the mold by a film feeding device which holds one end of the roll film and vertically drives it. In an injection molding apparatus having such a mold and a film feeding device, a film whose pattern or the like is individually or compositely processed by printing or embossing is fed to the mold surface on the cavity side of the injection molding mold, The first clamp and the second clamp are clamped on the surface of the mold around the cavity, and a heating device is used to heat and soften the film. Then, after the softened film is vacuum-suctioned to be substantially along the cavity surface, the mold is closed and the molten resin is injected into the cavity, and the film is integrated on the surface of the injected resin (for example, See Patent Document 1.)

Re-issued patent WO 97-27987

The clamp of such a frame is composed of a clamp plate, a clamp rod which is pre-retracted in parallel to the cavity side mold surface, and an air cylinder for driving the same. The film adsorption unit holding the sheet film can penetrate between the cavity side mold surface and the clamp plate so as not to interfere with the clamp plate and the clamp rod. And must be able to temporarily fix the sheet film on the cavity side mold surface. However, in order for the film suction unit holding the sheet film to penetrate between the cavity side mold surface and the clamp plate so as not to interfere with the clamp plate and the clamp rod, the distance between the rods is increased to open the clamp However, there is a large restriction on mold design, and even if a film such as air suction is installed on the cavity side mold surface for temporary fixing, the film is dragged into the cavity, etc. And the certainty was poor.

Furthermore, since the film is held down over the entire circumference, the film is more prone to wrinkles, and if wrinkles occur, the only way is to repress the entire circumference, which makes it difficult to remove the wrinkles.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and whether the film is a continuous film in a roll shape or a film cut into a sheet, the film is applied to the cavity side mold surface It is an object of the present invention to provide a rotary clamp device and a film clamp method which can be mounted and clamped and which can easily remove wrinkles of a film.

In order to achieve the above object, the present invention is configured as follows.

According to a first aspect of the invention, a drive arrangement,
A rotating shaft that can be rotated forward and reverse by the drive device;
The base end portion is fixed to the rotation axis, and the tip end portion approaches the pressing surface of the mold and can be in linear contact with a part of the edge of the film, and the film with the pressing surface Provided is a rotary clamp device comprising a plate-like clamp blade that can be held between.

According to the ninth aspect of the present invention, the tip of the plate-like clamp blade whose rotation axis is rotated in one direction by the drive device and whose base end is fixed to the rotation axis is the pressing surface of the mold. It is pivoted toward the opposite side to make linear contact with a part of the edge of the film, and the film is clamped between the tip end of the clamp blade and the pressing surface,
When the driving device rotates the rotation shaft in the direction opposite to the one direction, the tip of the clamp blade rotates away from the pressing surface of the mold to separate from the film, A film clamping method is provided for releasing the film from being clamped between the tip of the clamping blade and the pressing surface.

According to a tenth aspect of the present invention, there is provided the film clamping method according to the ninth aspect, in which the film is held between the tip end of the clamp blade and the pressing surface; The mold and another mold opposite to the mold are clamped with one another in a state in which the holding of the film is released after the holding of the film, and then the mold and the other metal are separated. Provided is a molded article produced by injection molding a molten resin in a cavity formed by a mold.

In the case of a conventional frame clamp, for example, when the film is rectangular, in order to clamp all four sides of the rectangle simultaneously, in particular, the film cut in advance in a sheet is placed on the cavity side mold surface and temporarily fixed. In addition, when wrinkles occur in a sheet or a continuous film that has been cut into a sheet, it is possible to remove the wrinkles by releasing the clamp of only part of the side of the film. It was not.

On the other hand, in the present invention, the tip of the clamp blade whose proximal end is fixed to the rotating shaft that can be rotated in the forward and reverse directions by the drive device can contact linearly with a part of the edge of the film There is. Therefore, for example, when the film is rectangular, the rotary clamp device can be disposed on each side and can be independently positioned at the holding position and the retracted position. As a result, for example, in order to place the film cut into sheets on the cavity-side mold surface, a film suction unit holding the sheet film while rotating the clamp blades on the four sides to the retracted position Is brought close to a predetermined position of the mold surface on the cavity side, and stopped at that position, and the clamp blade of four sides is rotated to clamp the film. Next, the film adsorption circuit on the side of the film adsorption unit holding the sheet film is turned off to release the film, and the hand retracts out of the mold, making it easy to put the sheet film to a predetermined position on the mold surface Can be clamped to As a further effect, when the film is wrinkled, the clamp blade of the rotary clamp device corresponding to the wrinkled portion is slightly returned from the clamping position to the retracted position side, thereby slightly loosening the clamping state and removing the wrinkles. It can be easy to do.

These and other objects and features of the present invention will become apparent from the following description in connection with the preferred embodiments of the attached drawings. In this figure,
FIG. 7 is a front view of the rotary clamp device at a retracted position in a mold provided with four rotary clamp devices according to the first embodiment of the present invention, FIG. 8 is a front view of the mold provided with four of the rotary clamp devices according to the first embodiment of the present invention, in which each rotary clamp device is at a clamping position, It is a partially expanded sectional view of the said metal mold | die in the clamping position of FIG. FIG. 3 is an enlarged sectional view showing a state of a clamp blade of the mold at the clamping position of FIG. 2; FIG. 3 is an enlarged sectional view showing a state of a clamp blade of the mold at the clamping position of FIG. 2; FIG. 13 is an enlarged cross-sectional view showing a state of the clamp blade at the clamping position of FIG. 2 in a modification of the clamp blade of the mold; FIG. 13 is an enlarged front view showing a state of the clamp blade at the holding position of FIG. 2 in the modification of the clamp blade of the mold; FIG. 7 is an enlarged cross-sectional view showing the state of the clamp blade in the clamping position of FIG. 2 in another modification of the clamp blade of the mold; It is an explanatory view of a process of carrying out a molding simultaneous decoration method with an injection mold provided with the above-mentioned rotary clamp device concerning the 1st embodiment, It is an explanatory view of a process of carrying out a molding simultaneous decoration method with an injection mold provided with the above-mentioned rotary clamp device concerning the 1st embodiment following Drawing 5A, It is an explanatory view of a process of carrying out a molding simultaneous decoration method with an injection mold provided with the above-mentioned rotary clamp device concerning the 1st embodiment following Drawing 5B, It is an explanatory view of a process of carrying out a molding simultaneous decoration method with an injection mold provided with the above-mentioned rotary clamp device concerning the 1st embodiment following Drawing 5C, It is a partially expanded sectional view of the rotary clamp apparatus concerning the modification of the said 1st Embodiment, It is a front view of the clamp blade of the rotary clamp apparatus concerning the modification of the said 1st Embodiment, It is a front view of the clamp blade of the rotary clamp apparatus concerning another modification of the said 1st Embodiment, FIG. 10 is a front view of the die provided with four rotary clamp devices according to the second embodiment of the present invention, in which each rotary clamp device is at the retracted position, FIG. 10 is a front view of the mold provided with four of the rotary clamp devices according to the second embodiment of the present invention, in which each rotary clamp device is in a sandwiching position, FIG. 10 is a front view of a mold provided with four rotary clamp devices according to a third embodiment of the present invention, in which each rotary clamp device is in a sandwiching position, FIG. 13 is a front view of the mold provided with two rotary clamp devices according to the fourth embodiment of the present invention, in which each rotary clamp device is in the sandwiching position, FIG. 13 is a front view of the mold provided with two rotary clamp devices according to the fifth embodiment of the present invention, in which each rotary clamp device is in the sandwiching position, FIG. 16 is a front view of the mold provided with four rotary clamp devices according to the sixth embodiment of the present invention, in which each rotary clamp device is at a holding position, FIG. 21 is a front view of the mold provided with four rotary clamp devices according to the seventh embodiment of the present invention, in which each rotary clamp device is in the sandwiching position, It is a front view in the clamping position of each rotary clamp apparatus in the metal mold | die provided with four rotary clamp apparatuses concerning 8th Embodiment of this invention.

Before continuing the description of the present invention, the same parts are given the same reference symbols in the attached drawings.

Various aspects of the present invention will now be described before detailed description of embodiments of the present invention with reference to the drawings.

According to the second aspect of the present invention, the rotation axis of the clamp blade is positioned lower than the parting line surface of the mold on which the clamp blade is disposed, and the clamp blade is made of the film When holding and releasing the mold with respect to the pressing surface, the mold is located at a retracted position lower than the parting line surface of the mold, and when holding the film with respect to the pressing surface of the mold, the mold The rotary clamp device according to the first aspect is provided in a clamping position higher than the ring line surface.

According to the third aspect of the present invention, the clamp blade is positioned at the holding position higher than the parting line surface of the mold only at the time of heating and vacuum suction of the film, and the film is made of gold. The mold is held between the pressing surface and the mold, and at the time of mold closing and mold opening of the mold, the mold is located at the retracted position lower than the parting line surface of the mold and the mold of the film of the mold The rotary clamp device according to the second aspect is provided, which is located at the retracted position lower than the parting line surface of the mold by releasing the clamping on the pressing surface.

According to the fourth aspect of the present invention, the clamp blade clamps the film between the heating and vacuum suction of the film and the completion of injection from the pressing surface of the mold to at least the mold opening. Just before, the rotary clamp device according to the second aspect is provided, wherein the film is released by rotating to a position higher than the pressing surface of the mold.

According to a fifth aspect of the present invention, there is provided the rotary clamp device according to any one of the first to fourth aspects, wherein the drive device is a rotary actuator.

According to the sixth aspect of the present invention, the film has a rectangular shape, and the edge of each side of the rectangular film is defined by the tip of the clamp blade and the pressing surface of the mold. The rotary clamp device according to any one of the first to fifth aspects is provided, which can be clamped between.

According to the seventh aspect of the present invention, the film has a rectangular shape, and the corners of the rectangular film are held between the tip end of the clamp blade and the pressing surface of the mold. The rotary clamp device according to any one of the first to fifth aspects is provided.

According to an eighth aspect of the present invention, an elastic portion is provided on one of the tip end of the clamp blade and the pressing surface of the mold which the tip end faces with the film interposed therebetween. The rotary clamp device according to any one of the first to seventh aspects is provided.

Hereinafter, an embodiment according to the present invention will be described in detail based on the drawings.

Hereinafter, a rotary clamp device and a film clamp method according to a first embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the rotary clamp device 7 according to the first embodiment of the present invention includes an air rotary actuator 1 as an example of a drive device, and a rotary shaft 2 that can be rotated forward and reverse by the air rotary actuator 1. The proximal end 3b is fixed to the rotary shaft 2 and the distal end 3c approaches the pressing surface 10a of the mold (fixed mold or movable mold) 10 and the film 6 is held between the pressing surface 10a A clamp blade 3 that can be held is provided. As a drive device, it is not limited to an air rotary actuator, Well-known drive devices, such as a motor, can be used suitably.

As a method of supplying the film 6 to the pressing surface 10a of the mold 10, each product portion of a sheet-fed type which supplies the film 6 one by one to the pressing surface 10a of the mold 10, and a roll type continuous film There is a continuous type in which (a portion to be a product in the transfer layer) is supplied to the pressing surface 10 a of the mold 10. In the first embodiment, a film 6 supplied in a sheet-fed type will be described. The roll type continuous film is different only in the method of supplying the film to the mold, and after being supplied, the operation of the clamping and release by the rotary clamp device 7 is the same, so the description will be omitted.

First, the shape of the sheet-fed film 6 in the first embodiment is, for example, rectangular.

In this first embodiment, in order to clamp each side of the rectangular film 6 against the pressing surface 10a of the mold 10, the four left, right, upper and lower rotary clamp devices 7 are independently formed to form a cavity of the mold 10. It arrange | positions around the recessed part 10b. However, as will be described later, the number or arrangement of the rotary clamp devices 7 is not limited to the first embodiment.

The pressing surface 10 a of the mold 10 is also a surface which is disposed around the cavity forming recess 10 b of the mold 10 and forms the parting line surface PL of the outer portion of the product. A mold (a movable mold or a fixed mold; hereinafter referred to as a second mold) 11 is different from the mold (a fixed mold or a movable mold; hereinafter referred to as a first mold) 10. When the mold is closed, a part of the cavity forming convex part 11b of the second mold 11 facing the first mold 10 enters the cavity forming concave part 10b of the first mold 10, and the cavity forming concave The cavity 23 can be formed between 10 b and the cavity forming convex portion 11 b. A suction groove 10g is disposed on the pressing surface 10a around the cavity forming recess 10b so as to surround the entire periphery at a predetermined distance from the edge of the cavity forming recess 10b. The suction groove 10g is communicated with a suction device (not shown) to suction and hold the periphery of the film 6 sandwiched between the rotary clamp device 7 and the pressing surface 10a, and the film 6 is held against the cavity forming recess 10b. Vacuum forming is possible.

The rotating shaft 2 is formed of, for example, a metal shaft member, and both ends thereof are rotatably supported by the mold 10 via bearings 8. The rotary shaft 2 is located inside the first concave portion 10 d where a part of the pressing surface 10 a is cut out so as to be located at a position lower than the pressing surface 10 a of the first mold 10, in other words, the parting line surface PL. Housed and arranged.

In the left and right rotary clamp devices 7, the drive shaft 1 a of the air rotary actuator 1 is directly connected to one end of each rotary shaft 2 via the coupling 9, and the drive shaft is driven by forward and reverse drive of the air rotary actuator 1. The rotation shaft 2 rotates in the forward and reverse directions via the coupling 9 when the rotation of the rotational shaft 2 rotates in the forward and reverse directions.

In the upper and lower rotary clamp devices 7, a pulley 14 is fixed at the central portion of each rotating shaft 2. The pulley 14 and the pulley 15 fixed to the drive shaft 1 a of the air rotary actuator 1 are connected by a timing belt 16, and the pulley 15 of the drive shaft 1 a rotates forward and reverse by forward and reverse drive of the air rotary actuator 1. The rotary shaft 2 rotates forward and reverse via the timing belt 16 and the pulley 14 on the rotary shaft side. In order to fix the pulley 14 at the central portion of the rotating shaft 2 and hang the timing belt 16 around, a notch 3g is provided in a part of the clamp blade 3 of the upper and lower rotary clamp device 7 to make the pulley 14 and the timing belt The clamp blade 3 does not prevent the drive of the 16.

Each air rotary actuator 1 is accommodated and disposed in a second recess 10 e which is lower than a first recess 10 d in which a part of the pressing surface 10 a is cut out.

The clamp blade 3 is a substantially rectangular plate member made of, for example, a metal spring material capable of coming into contact with the film 6 linearly (for example, linearly), and in the width direction of the rectangular clamp blade main body 3a. Both end portions (the base end 3b and the tip 3c) are bent so as to form an obtuse angle with the clamp blade main body 3a. The proximal end 3 b is fixed to the rotation shaft 2. As described above, since the clamp blade 3 can contact the film 6 linearly (for example, linearly), air leak from the film 6 and the mold is unlikely to occur during vacuum suction, and thin cracks Even in the case of using an easy-to-use film, it is possible to prevent the film from being broken at the time of vacuum suction and to make wrinkles less likely to occur. On the other hand, conventionally, when it is possible to make contact with the film 6 in a point shape with a clamp arranged in a point shape, air leaks easily from between the film and the mold at the time of vacuum suction, When using a film, problems such as cracking of the film during vacuum suction and wrinkles are likely to occur.

The tip 3c approaches the pressing surface 10a of the first mold 10, and can hold the film 6 between the pressing surface 10a and the pressing surface 10a. At this time, since the front end portion 3c is a linear edge, the front end portion 3c linearly contacts the film 6 with respect to the pressing surface 10a of the first mold 10, and the pressing surface 10a is linearly formed. Since the film 6 is held between the leading end 3c, the film 6 can be held stably. The clamp blade 3 fixed to the rotation shaft 2 rotates integrally with the rotation shaft 2 and retracts into the recess 10 d of the first mold 10 to retract position A lower than the parting line surface PL, and 1 at a holding position B which is higher than the parting line surface PL of the mold 10 and the tip 3c approaches the pressing surface 10a of the first mold 10 to sandwich the film 6 with the pressing surface 10a For example, it is possible to turn within an angle range of 180 degrees or more between them.

As shown in FIGS. 4C and 4D, an elastic portion 4 made of rubber or the like is provided at the front end portion 3c so as not to damage the film 6 when the film 6 is held between the pressing surface 10a. Is preferred. Alternatively, as shown in FIG. 4E, an elastic portion 4a such as rubber stored in the recess 10f is provided on the pressing surface 10a to which the tip 3c can contact, and a film is formed between the tip 3c and the pressing surface 10a. When sandwiching 6, it is preferable not to damage the film 6 and to prevent displacement of the film 6.

The respective air rotary actuators 1 of the left and right rotary clamp devices 7 and the respective air rotary actuators 1 of the upper and lower rotary clamp devices 7 are controlled by a control device 17 (shown only in FIG. 1 and omitted in the other drawings). Each has its own operation control. The control device 17 supplies the film 6 to the first mold 10, sucks the film, heats the film 6, closes and releases the first mold 10 and the second mold 11, and forms the first mold 10 and the second mold 11. The timing of driving of each rotary clamp device 7 is controlled in consideration of a series of operation information such as an article taking-out operation. Therefore, although not specifically shown, operation signals from other devices such as a supply device for supplying the film 6, a suction device, a heating device, a mold closing device for the second mold 11, and a molded product removal device The timing of driving of each rotary clamp device 7 can be controlled based on the inputted operation signal.

Under the control of the control device 17, each rotary clamp device 7 having such a configuration drives the drive shaft 1a of the air rotary actuator 1 in a positive direction, for example, and causes the rotation shaft 2 to rotate in a positive direction. As a result, the clamp blade 3 is rotated from the retracted position A to the holding position B, and the tip portion 3 c of the clamp blade 3 presses the periphery of the film 6 against the pressing surface 10 a of the first mold 10. It can be held between the tip 3 c of the clamp blade 3 and the pressing surface 10 a of the first mold 10. On the other hand, under the control of the control device 17, the drive shaft 1a of the air rotary actuator 1 is reversely driven to rotate the rotary shaft 2 in the reverse direction. As a result, the clamp blade 3 is rotated from the holding position B to the retracted position A, and the tip 3c of the clamp blade 3 is separated from the film 6 and held between the clamp blade 3 and the pressing surface 10a of the first mold 10. Can be released.

The above is the basic operation of the rotary clamp device 7. The relationship between the operation of the rotary clamp device 7 and the simultaneous molding decoration operation will be described below with reference to FIGS. 5A to 5D.

First, as shown in FIG. 5A, a film which is set on a robot (not shown) and which holds the film 6 by suction in a clamp open state of each rotary clamp device 7 (a state where the clamp blade 3 is located at the retracted position A). The suction unit 20 is transferred to the vicinity of the cavity forming recess 10 b of the first mold 10.

Next, as shown in FIG. 5B, the film 6 is held by suction by the film suction unit 20 while the film 6 is positioned with respect to the cavity surface which is the opening surface of the cavity forming recess 10b of the first mold 10. It is moved until it comes into contact with the pressing surface 10 a around the cavity forming recess 10 b. That is, until a part of the film 6 comes into contact with the pressing surface 10a and the remaining part of the film 6 comes close to the pressing surface 10a or until all the film 6 comes into contact with the pressing surface 10a The film suction unit 20 is moved to approach the first mold 10.

Thereafter, the rotary clamp device 7 is driven under control of the control device 17 with respect to the periphery of the film 6 in a state in contact with the pressing surface 10a or in a state approaching the pressing surface 10a, Is turned from the clamp open state (the state where the clamp blade 3 is positioned at the retracted position A) to the clamp closed state (state where the clamp blade 3 is positioned from the retracted position A to the sandwiching position B). In this state, the outer periphery of the product portion of the film 6 (the portion to be a product in the transfer layer) 6a is held by the pressing surface 10a by the four rotary clamp devices 7 in the upper, lower, left, and right.

Next, as shown in FIG. 5C, after the film adsorption unit 20 releases the air adsorption and releases the film 6 from the film adsorption unit 20, the film adsorption unit 20 retracts to the outside of the first mold 10.

Next, the film 6 is brought close to the first mold 10 so as to heat the film 6 by the heating device 21, and the film 6 is heated and softened by the heating device 21 to form a large number of vacuum suction holes formed on the cavity forming recess 10 b side. By air suction, the softened film 6 is placed along the cavity surface, that is, the bottom surface of the cavity forming recess 10b, and is suctioned by the suction groove 10g to adsorb and hold the film 6 on the first mold 10. Up to this point, in each rotary clamp device 7, the clamp blade 3 is positioned at the sandwiching position A, and continues to clamp the film 6 between the clamp blade 3 and the pressing surface 10a.

Next, as shown in FIG. 5D, with the air suction on the cavity side continued (in a state where the film 6 is adsorbed and held by the first mold 10), the heating device 21 is also retracted to the outside of the first mold 10. After that, the clamp blade 3 of each rotary clamp device 7 is rotated from the holding position A to the retracted position B to be positioned, and the holding of the film 6 between the clamp blade 3 and the pressing surface 10a is released.

Thereafter, the second mold 11 is moved relative to the first mold 10 and closed with a mold closing device (not shown) (or the first mold 10 is moved to the second mold 11) Then, after the mold closing device (not shown) closes the mold, the molten resin is injected from the nozzle 24 of the injection molding machine into the cavity 23 of the second mold 11 and the molten resin and the film 6 in the cavity 23 The adhesive surface side of the product portion 6a is integrated by adhesion. The core-side insert forming the cavity-forming convex portion 11b of FIG. 5D is configured as a core protruding into the cavity 23 which is fixed to the second mold 11 to form the back surface side of the product.

Next, after the molten resin is cooled and solidified, the mold closing of the first mold 10 and the second mold 11 is released, and the first mold 10 and the second mold 11 are opened, whereby the molded product is obtained. The molded product is taken out of the cavity 23 of the first mold 10 while being fixed to the second mold side. At this time, since the clamp blade 3 of each rotary clamp device 7 is located at the retracted position B below the pressing surface 10 a of the first mold 10 (opposite to the second mold 11), Even if the margin portion of the integrated film 6 is removed from the first mold 10, it does not contact the clamp blade 3. Then, the product is pushed up and taken out by the ejector pin 25 of the first mold 10.

According to the first embodiment of this configuration, the conventional frame clamp is divided into four rotary clamp devices 7 corresponding to the four sides of the film 6, and the rotary clamp devices 7 on each side It is configured to be driven independently. Therefore, the film 6 cut into sheets can be easily placed and clamped on the pressing surface 10a of the mold surface on the cavity side, and when the film 6 is wrinkled, the film 6 corresponds to the part having the wrinkles. By slightly returning the clamp blade 3 of the rotary clamp device 7 from the holding position B to the retracted position A side, it is possible to loosen the holding state a little to make it easy to remove the wrinkles. At this time, since the clamp blade 3 of the other rotary clamp device 7 may be held at the holding position B, it is possible to prevent the film 6 from being misaligned or further generating wrinkles. Furthermore, since the margin portion of the film 6 integrated with the molded product does not contact the clamp blade 3, there is no room for applying a force to roll up the film 6 at the end face of the molded product.

Further, according to the first embodiment, in addition to simultaneously clamping the edge portions of the four sides of the film 6 by the four rotary clamp devices 7, one clamp blade 3 of the four side rotary clamp devices 7 is provided. Alternatively, the clamp blade 3 of the rotary clamp device 7 of the three sides is simultaneously rotated, or after heating the film, the clamp blade 3 of the rotary clamp device 7 of the two sides is optionally rotated. It is also possible to clamp the film 6 at the holding position B, and the degree of freedom of the clamping operation can be enhanced. For example, after clamping the end of the long side of the film 6 with the two upper and lower rotary clamps 7 in FIG. 1, the remaining end of the short side of the film 6 with the remaining two rotary clamps 7 The film 6 can be held in the first mold 10 by clamping the Conversely, after clamping the end of the short side of the film 6 by the rotary clamp device 7 on the left and right two sides in FIG. 1, the end of the long side of the film 6 by the remaining two upper and lower rotary clamp devices 7 The film 6 can be held on the first mold 10 by clamping the portion. In this way, the film 6 can be positioned on the pressing surface 10 b of the first mold 10 while effectively preventing the occurrence of the wrinkles of the film 6.

Further, in the conventional clamp of the frame, it is necessary to supply the film so as to slide into the gap between the clamp of the frame and the mold. The clamps were in the way and it was difficult to automatically feed the film 6 to the predetermined position of the mold. On the other hand, in the first embodiment, by positioning the clamp blades 3 of all the rotary clamp devices 7 from the holding position B to the retracted position A, the single-wafer is not disturbed by the rotary clamp device 7 at all. The film 6 can be automatically supplied to a predetermined position of the mold by the formula. In particular, the rotary shaft 2 and the drive device 1 of the rotary clamp device 7 are disposed in the first recess 10 d and the second recess 10 e lower than the pressing surface 10 a and the clamp blade 3 in the retracted position B is also in the first recess 10 d. Since it is positioned, the supplied film 6 and its supply device do not come in contact with the rotary clamp device 7 at all, and film supply can be performed smoothly and reliably automatically.

Also, conventionally, when the molded product is taken out of the mold cavity in the process of mold opening, the base film integrated with the molded product must slip through the inner surface of the clamp (the pressing surface for the mold), When the frictional resistance acts in the direction of peeling off the film against the parting line surface of the product, and the cooling time is not sufficiently secured, between the base film and the product around the parting line surface of the product And cause a poor adhesion. On the other hand, in the first embodiment, before the first mold 10 and the second mold 11 are closed, the film 6 is suctioned by the suction groove 10g or the like and suctioned to the first mold 10 side. The first mold 10 and the second mold 11 can be closed and injection molded while holding and retracting the clamp blades 3 of all the rotary clamp devices 7 from the holding position B to the retracted position A. . Therefore, at the time of mold opening, the film 6 integrally held by the molded product can be taken out of the first mold 10 without any contact with the respective rotary clamp devices 7, and the above-mentioned conventional problem is assured Can be resolved.

Further, in the first embodiment, before the first mold 10 and the second mold 11 are closed, the film 6 is suctioned by the suction groove 10g or the like and held on the first mold 10 side by suction. And, in a state where not all the rotary clamp devices 7 but the clamp blades 3 of the opposing two sides of the rotary clamp devices 7 are retracted from the holding position B to the retracted position A, the first mold 10 and the second mold 11 can be closed for injection molding. In this way, at the time of mold opening, the at least two sides of the rotary clamp device 7 are not completely clamped to the film 6, so that the peeling off of the end face at the time of clamp slippage conventionally generated It is also possible to reduce more.

Moreover, while the conventional frame clamp is composed of the frame, the guide member of the frame, and the drive device, it is composed of the clamp blade 3 of the plate member, the rotary shaft 2 and the drive device. It can be made very compact, the thickness of the member holding the film 6 can be thin and light, and the manufacturing cost can be low.

More specifically, since the conventional frame clamp needs to move the frame in parallel, it must have a certain thickness and be rigid, so that the thickness of the frame is, for example, about 20 mm or more Even if it was desired to bring the heating device close to the film, the heating device could not be brought close to the film to less than the thickness of the clamp. On the other hand, in the first embodiment, in the state where the film 6 is clamped by the clamp blade 3 (the state where the clamp blade 3 is positioned at the holding position B), from the parting line surface PL to the upper end of the clamp blade 3 For example, the protrusion can be reduced to 10 mm or less, and the heating device 21 can be closer to the film 6 than in the conventional case, and the heating efficiency of the film 6 by the heating device 21 can be improved.

Also, conventionally, since heat from the heating device is taken away by the frame clamp itself in the portion of the film around the frame clamp, a large difference occurs in the softened state of the film between the central portion and the peripheral portion of the film. In some cases, this may cause wrinkles or film breakage. However, in the first embodiment, since the clamp is configured not by the frame but by the clamp blade 3 of the plate member, for example, the thickness of the clamp blade 3 is 2 mm or less and from the parting line plane PL The protrusion to the upper end of the clamp blade 3 can be reduced to, for example, 10 mm or less, and the heating device 21 can be brought closer to the film 6 than in the past. As a result, there is almost no difference in the softened state of the film between the central portion and the peripheral portion of the film (the vicinity of the tip 3b of the clamp blade 3), and the occurrence of wrinkles or film breakage can be effectively prevented. . Furthermore, since the heating device 21 can be made closer to the film 6 than in the conventional case, the heating time of the film 6 can be shortened, and furthermore, the temperature itself of the heating device 21 can be lowered, thereby saving energy. It can also contribute.

Further, according to the first embodiment, the clamp blade 3 of the upper and lower rotary clamp devices 7 is positioned at the holding position B to hold the film 6 on the pressing surface 10 a of the first mold 10 while the left and right rotary clamps are held. The device 7 heats the film 6 with the heating device 21 at the retracted position A, positions the left and right rotary clamp devices 7 at the holding position B at a predetermined timing, and holds it on the pressing surface 10a of the first mold 10. As described above, operation control can be performed by the control device 17. In this way, the sealed state between the cavity 23 and the film 6 is relaxed, and the gas generated from the film 6 at the time of film heating is passed through the left and right portions of the film 6 not clamped by the clamp blade 3. It is possible to escape from the inside to the outside of the cavity 23, and the contamination of the cavity surface can be reduced.

Furthermore, according to the first embodiment, before the first mold 10 and the second mold 11 are closed, the film 6 is suctioned by the suction groove 10g or the like and held on the first mold 10 side by suction. And, with the clamp blades 3 of all the rotary clamp devices 7 retracted from the holding position B to the retracted position A, the first mold 10 and the second mold 11 can be closed and injection molded. Therefore, in the second mold 11 facing the first mold 10 to which the rotary clamp device 7 is attached, the relief space of the clamp blade 3 of the rotary clamp device 7 can be completely eliminated at the time of mold closing. The strength of the mold 11 can also be improved, and design constraints when installing the slide core on the second mold 11 can also be reduced.

Further, according to the first embodiment, the air rotary actuator 1 can be eccentrically disposed from the axial center of the rotating shaft 2 by the timing belt 16, and the parting line surface PL of the first mold 10 can be obtained. The air rotary actuator 1 can be accommodated in the recessed second recess 10 e, and it can be prevented from interfering with other operations such as the supply or removal of the film 6 or the heating operation.

The present invention is not limited to the first embodiment, and can be implemented in other various aspects. It goes without saying that in the following embodiment, the same effects as those of the first embodiment can be obtained.

For example, in the first embodiment, the first mold 10 and the second mold are in a state in which the clamp blades 3 of all the rotary clamp devices 7 are retracted from the clamping position B to the retraction position A before the mold is closed. The mold 11 is closed, but the present invention is not limited to this. As shown in FIG. 6, when the mold is closed, the clamp blades 3 of all the rotary clamp devices 7 are located at the clamping position B. It may be In this case, it is necessary to form a relief space 11g of the clamp blade 3 of the rotary clamp device 7 at the time of mold closing in the second mold 11. In comparison with the relief space in the case of the conventional frame clamp, The depth and width of the relief space 11g can be greatly reduced, and design restrictions when installing the slide core in the second mold 11 can be reduced.

In addition, in the case of such a modification, the clamp blades 3 of all the rotary clamp devices 7 remain at the clamping position B at the time of mold closing and injection molding, and all the rotary clamps before injection molding. It is also possible to perform the injection molding process in a state where the clamp blade 3 of the device 7 is slightly rotated from the holding position B to the retracted position A side in the escape space 11g to loosen the holding. On the other hand, when all the clamp blades 3 are released, air leakage may easily occur during vacuum suction, or the film 6 may be dragged into the cavity during injection molding to cause wrinkles. On the other hand, as described above, such a disadvantage can be eliminated if the clamping of the clamp blade 3 is slightly loosened.

Moreover, as a drive device 1 for generating rotational driving force, although a general rotary actuator or a motor etc. can be used, it is not restricted to this. For example, as a drive device, a configuration that converts linear motion by a drive source into rotational motion via a cam mechanism or the like can be used. The rotational driving force can be transmitted from the driving device 1 to the rotating shaft 2 to which the clamp blade 3 is fixed, and can be configured to be able to rotate in the range of 0 ° to 200 °. Here, when the rotation angle of the clamp blade 3 is 0 °, it is in the film clamp state, and in consideration of setting the sheet film, it is necessary to open 90 ° or more as the rotation angle. Therefore, considering the margin, it is preferable to set the rotation angle of the clamp blade 3 to 0 ° to 180 °.

In addition to the flat one as described above, the tip shape of the clamp blade 3 may be a saw blade-like jagged edge like the clamp blade 3A shown in FIG. 7A. In this way, in the non-contacting portion (cutout portion) 3Ab between the contact portion 3Aa and the contact portion 3Aa that linearly contact the part of the edge of the film 6, the film 6 It is possible to release the wrinkles and slack, and also to release the gas generated from the film 6. Of course, the tip shape of the clamp blade 3 is not limited to the sawtooth-like jagged shape, and contacts linearly with a part of the edge of the film 6 as in the clamp blade 3B shown in FIG. 7B. Even in the shape of a comb blade in which short flat portions (line contact portions) 3Ba and notched portions 3Bb are alternately arranged, the above-described effects can be obtained.

Further, as a second embodiment of the present invention, as shown in FIGS. 8A and 8B, all rotary clamp devices 7 have the same structure as the left and right rotary clamp devices 7 of FIG. 1 without using the timing belt 16. It may be That is, the upper, lower, left, and right rotary clamp devices 7 are directly coupled to the drive shaft 1 a of the air rotary actuator 1 via the coupling 9 at one end of the rotary shaft 2, respectively. Thus, the drive shaft 1a can be rotated forward and reverse, and the rotation shaft 2 can be rotated forward and reverse via the coupling 9. 8A shows a state in which each clamp blade 3 is located at the retracted position A, and FIG. 8B shows a state in which each clamp blade 3 is located at the sandwiching position B.

Further, as a third embodiment of the present invention, as shown in FIG. 9, the clamp blade 3 of one rectangular plate member of each rotary clamp device 7C is divided into a large number of small rectangular plate members, and linearly It may be configured as a clamp blade 3C having a large number of line contact portions 3Ca that can contact the film 6, and a gap 3Cb between the adjacent line contact portions 3Ca. The base end portions of all the line contact portions 3Ca are fixed to the rotating shaft 2, and are rotated integrally with the rotating shaft 2. In this way, it is possible to release the wrinkles and slack of the film 6 in the gap 3Cb, and it is also possible to release the gas generated from the film 6. 9 shows a state in which each clamp blade 3C is located at the holding position B.

As a more specific form of dividing the clamp blade 3 of one rectangular plate member into a large number of small rectangular plate members, it is particularly preferable to divide one clamp blade 3 into three or four. The reason is as follows. In the case of one clamp blade 3, it may be difficult to make uniform contact with the pressing surface 10 a due to distortion or the like of the clamp blade 3. On the other hand, when one clamp blade 3 is divided into three or four, distortion of the clamp blade 3 is dispersed, and a force is applied to the clamp blade 3 of each divided piece, so the film 6 Can be clamped without a gap between the tip 3c of the clamp blade 3 and the pressing surface 10a of the first mold 10, so that air leak is unlikely to occur between the film 6 and the pressing surface 10a.

Further, as a fourth embodiment of the present invention, as shown in FIG. 10, instead of arranging the rotary clamp device 7 on the four sides, the rotary clamp device 7D is arranged on two opposing sides along the long side of the film 6. In addition, the longitudinal ends of the clamp blade main body 3Da of the clamp blade 3D of the rectangular plate member which can contact the film 6 linearly can be inserted into the short side of the film 6 and can be straight and curved It may be configured as an L-shaped end 3Dc that can contact the film 6. In a state where the clamp blade 3D is positioned at the sandwiching position B, the edge along the long side of the film 6 is clamped between the clamp blade main body 3Da and the pressing surface 10a, and along the corner and short side of the film 6. An end edge portion of a part of the two is held between the L-shaped end 3Dc and the pressing surface 10a. In this way, the number of rotary clamp devices 7D can be halved as the entire film clamp device. FIG. 10 shows a state in which each clamp blade 3D is located at the sandwiching position B.

Further, as a fifth embodiment of the present invention, as shown in FIG. 11, which corresponds to a modification of FIG. 10, the clamp blade 3D of the rectangular plate member of each rotary clamp device 7E is divided into three to obtain a clamp blade 3E. There is. That is, the clamp blade 3E is fixed at the center of the rotary shaft 2 and can be in contact with the film 6 at the center portion 3Ee which can contact the film 6 linearly and at both ends of the rotary shaft 2 And two L-shaped end portions 3Ec. In a state where the clamp blade 3E is positioned at the sandwiching position B, the edge along the long side of the film 6 is clamped between the central portion 3Ee and the pressing surface 10a, and one of the corners and the short side of the film 6 The end edge of the part is held between the L-shaped end 3Ec and the pressing surface 10a. In this way, the number of rotary clamp devices 7D can be halved as a whole of the film clamp device, and the weight of the clamp blade 3E can be further reduced. FIG. 11 shows a state in which each clamp blade 3E is located at the holding position B.

Further, as a sixth embodiment of the present invention, as shown in FIG. 12, the clamp blade of one rectangular plate member of each rotary clamp device 7F can be linearly contacted with a large number of small and roughly trapezoidal shapes. The clamp blade 3F may be divided into plate members and configured as a clamp blade 3F having a large number of line contact portions 3Fa linearly contacting with the film 6 and a gap 3Fb between the adjacent line contact portions 3Fa. The base end corresponding to the shorter side of the upper bottom side and the lower bottom side of the trapezoidal shape of each line contact portion 3Fa is fixed to the rotation shaft 2 so as to rotate integrally with the rotation shaft 2 There is. In this way, it is possible to release the wrinkles and slack of the film 6 in the gap 3Fb, and it is also possible to release the gas generated from the film 6. FIG. 12 shows a state in which each clamp blade 3F is located at the sandwiching position B.

Further, as a seventh embodiment of the present invention, as shown in FIG. 13, which corresponds to the modification of FIG. 1, each rotary clamp device 7G is a clamp device for an elliptical film 6G. Each rotary clamp device 7G differs from the rotary clamp device 7 of FIG. 1 in that the tip 3Gc of the clamp blade 3 of the plate member is not linear but formed in an arc corresponding to the arc of the edge of the film 6G. It is FIG. 13 shows a state in which each clamp blade 3G is located at the holding position B.

According to the seventh embodiment, since the uniform film pressing surface can be formed by offsetting on the outer periphery of the product portion of the molded product, the heat applied to the margin portion of the film 6 becomes even, and it occurs at the time of vacuum molding In some cases, it works effectively as a measure against wrinkles.

In addition, as an eighth embodiment of the present invention, as shown in FIG. 14, the clamp blades of one plate member of each rotary clamp device 7G of FIG. The clamp blade 3H may be divided into plate members and configured as a clamp blade 3H having a large number of line contact portions 3Ha in contact with the film 6 in an arc curve shape and a gap 3Hb between the adjacent line contact portions 3Ha. The base end of each line contact portion 3Ha is fixed to the rotary shaft 2 so as to rotate integrally with the rotary shaft 2. In this way, it is possible to release the wrinkles and slack of the film 6 in the gap 3Hb, and it is also possible to release the gas generated from the film 6. FIG. 14 shows a state in which each clamp blade 3H is located at the holding position B.

Further, although not shown specifically, it is also possible to dispose the rotary clamp devices 7 respectively on the left and right and lower three sides and to dispose a conventionally known bar type clamp on the remaining upper side.

In addition, the effect which each has can be show | played by combining suitably the arbitrary embodiment or modification of said various embodiment or modification.

The rotary clamp device and the film clamp method according to the present invention are easy to remove the wrinkles of the film, and are useful for the film clamp in the injection molding simultaneous decoration process and the like.

While the present invention has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art. Such variations or modifications are to be understood as being included therein without departing from the scope of the present invention as set forth in the appended claims.

Claims

A drive (1),
A rotating shaft (2) that can be rotated forward and reverse by the drive device;
The base end (3b) is fixed to the rotary shaft, and the tip end (3c) approaches the pressing surface (10a) of the mold (10) and one of the edges of the film (6, 6G) A rotary clamp device comprising: a plate-like clamp blade (3) capable of being in linear contact with a portion and capable of holding the film with the pressing surface.
The rotation axis of the clamp blade is positioned lower than the parting line surface (PL) of the mold in which the clamp blade is disposed, and the clamp blade is the pressing surface of the mold of the film. When the film is held and released from the mold, the film is located at a retracted position (A) lower than the parting line surface of the mold, while when the film is held to the pressing surface of the mold, the parting line surface of the mold is The rotary clamp device according to claim 1, wherein the rotary clamp device is located in a high clamping position (B).
The clamp blade is positioned at the holding position higher than the parting line surface of the mold only during heating and vacuum suction of the film, and holds the film between the holding surface of the mold and the holding surface. When the mold is closed and opened, the mold is located at the retracted position lower than the parting line surface of the mold, and the film is released from being held against the pressing surface of the mold to release the metal. The rotary clamp device according to claim 2, wherein the retracted position is located at the retracted position lower than the parting line surface of the mold.
The clamp blade clamps the film between the heating and vacuum suction of the film and the completion of injection from the pressing surface of the mold, and at least immediately before the mold opening, the pressing of the mold is performed. The rotary clamp device according to claim 2, wherein the film is released by rotating to a position higher than the surface.
The rotary clamp device according to any one of the preceding claims, wherein the drive device is a rotary actuator (1).
The film has a rectangular shape, and the edge of each side of the rectangular film can be held between the tip of the clamp blade and the pressing surface of the mold. The rotary clamp device according to any one of to 4.
5. The film according to claim 1, wherein the film is rectangular and each corner of the rectangular film can be held between the tip of the clamp blade and the pressing surface of the mold. The rotary clamp device according to any one.
The elastic portion (4, 4a) is provided on any one of the tip end of the clamp blade and the pressing surface of the mold opposed to the tip through the film. The rotary clamp device according to any one of the preceding claims.
The tip (3c) of the plate-like clamp blade (3) is fixed by rotating the rotating shaft (2) in one direction by the driving device (1) and fixing the proximal end (3b) to the rotating shaft. It turns to approach the pressing surface (10a) of the mold (10) and contacts a part of the edge of the film (6, 6G) in a line, and the film is moved to the tip of the clamp blade While holding between the and the pressing surface,
The rotation shaft (2) is rotated in the direction opposite to the one direction by the driving device (1), and the tip end (3c) of the clamp blade (3) is pressed by the pressing of the mold (10). A film clamping method for pivoting away from the surface (10a) and separating from the film (6, 6G) to release the film from clamping between the tip end of the clamping blade and the pressing surface .
A state in which the film is held between the tip end portion of the clamp blade and the pressing surface by using the film clamp method according to claim 9, and a state in which the film is released after the film is held. And clamping the mold (10) and another mold (11) facing the mold in any one state, and thereafter forming the mold and the other mold. A molded article produced by injection molding a molten resin in the cavity (23).