JP2009131975A - Injection molding machine and method for taking out molding from injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine equipped with a retrieval device which takes out a molding etc., at a high speed by a simple mechanism when the molding is taken out from a mold in the injection molding machine fitted with the mold with a plurality of cavities arranged horizontally, and also to provide a method for taking out the molding from the injection molding machine. <P>SOLUTION: In the injection molding machine 10 fitted with molds 17 and 20 with a plurality of the cavities 23a, 23b, 32a, and 32b arranged horizontally, in the molding P taking out device 40 set in the injection molding machine 10, an arm 43 rotated by the rotation of a rotary shaft 42 is installed. A sucker 47 which sucks/holds the molding P is attached to the arm 43. When the arm 43 is rotated/moved, the sucker 47 is moved in front of the molding P on the distant side seen from the waiting position H of the retrieval device 40 without interference with a sprue S held by the mold 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached, and a method of taking out a molded product of the injection molding machine. The present invention relates to an injection molding machine provided with a take-out device and a method for taking out a molded product of the injection molding machine.

As shown in Patent Document 1, as a take-out device that is provided in an injection molding machine including an injection compression molding machine and takes out a molded product, a take-out device is inserted between two upper tie bars and molded. The most common is a take-out device that takes the product upward and horizontally moves it to the side. However, the take-out device involves raising and lowering the take-out device and horizontal movement, so that it takes time to take out the molded product. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 2004-228561, a horizontal movement type take-out device is also known that takes out the take-out device from between the upper and lower tie bars and moves the molded product in the horizontal direction as shown in Patent Document 2. However, in the case of a mold in which a plurality of cavities are arranged in the horizontal direction, the horizontal movement type take-out device shown in Patent Document 2 adsorbs a molded product by a sprue held in the movable mold. There is a problem that it takes time. That is, in the conventional horizontal movement type take-out device shown in FIG. 4, when entering between the molds from the standby position A, the fixed mold side is moved horizontally from the tip Sa of the sprue S and stopped at the position B. Then, it moves toward the movable mold side and sucks the molded product at the position C. Therefore, the distance to move in the mold opening / closing direction from the position B to the position C becomes longer, and the movement time is also increased accordingly. Further, in order to solve the above problem, the center line of the molded product W is avoided by avoiding the position S1 where the sprue S interferes, as in another conventional horizontal moving type take-out device whose main part is shown in FIG. It is also conceivable to arrange the suction cup C so as to adsorb portions other than W1. However, the horizontal movement type take-out apparatus shown in FIG. 5 increases the number of suction cups C and complicates the apparatus, thereby increasing the cost and increasing the weight, so that the moment of inertia when the apparatus moves horizontally increases. There was a problem. Furthermore, in the disk molding, there is an example in which a swivel take-out machine as shown in Patent Document 3 is used, but it has not been used for other molded products.

JP 2003-145593 A (0032, FIG. 2) JP 2001-79910 A (Claim 1, FIG. 1) JP 2007-15110 A (0014, FIG. 1, FIG. 3)

In the present invention, in view of the above problems, in an injection molding machine equipped with a mold in which a plurality of cavities are arranged in a horizontal direction, when taking out the molded product from the mold, the molded product or the like can be removed at high speed by a simple mechanism. It is an object of the present invention to provide an injection molding machine provided with a take-out device that can be taken out, and a method for taking out a molded product from the injection molding machine.

According to a first aspect of the present invention, there is provided an injection molding machine comprising: a rotating shaft rotating in a molded product take-out device disposed in an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached. Is provided with a suction cup for sucking and holding a molded product, and when the arm is swung, the suction cup does not interfere with the sprue held by the mold. It is characterized by being moved forward of the far side molded product as seen from the standby position.

The injection molding machine according to claim 2 of the present invention is an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached. An arm that is turned by the rotation of the rotary shaft is provided, and a suction cup that holds the molded product by suction and a chuck that holds the sprue are attached to the arm, and the suction cup is held by the mold when the arm is turned. The chuck is moved to a position where the sprue can be sandwiched from the side of the sprue as well as being moved to the front of the molded product on the far side as viewed from the standby position of the take-out device without interfering with the sprue that has been placed. And

The injection molding machine according to claim 3 of the present invention is characterized in that in claim 1 or claim 2, at least one of the suction cups is held in contact with the center line of the molded product.

According to a fourth aspect of the present invention, there is provided a method for taking out a molded product from an injection molding machine, wherein the molded product is taken out from an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached. In the take-out method, the molded product take-out device disposed in the injection molding machine is provided with an arm that is turned by the rotation of the rotary shaft, and a suction cup that holds and holds the molded product is attached to the arm. When moved, the suction cup is moved to the front of the far-side molded product as viewed from the standby position of the take-out device without interfering with the sprue held by the mold.

According to a fifth aspect of the present invention, there is provided a method for taking out a molded product from an injection molding machine, wherein the molded product is taken out from an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached. In the take-out method, the take-out device for the molded product disposed in the injection molding machine is provided with an arm that is turned by the rotation of the rotary shaft, and a suction cup that sucks and holds the molded product on the arm, and a chuck that holds the sprue. When the arm is pivoted, the suction cup is moved to the front of the molded product on the far side as viewed from the standby position of the take-out device without interfering with the sprue held by the mold, and the chuck is It is moved to a position where the sprue can be sandwiched from the side of the sprue.

According to a sixth aspect of the present invention, there is provided a method for taking out a molded product of an injection molding machine according to the fourth or fifth aspect, wherein the suction cup for taking out the molded product on the far side as viewed from the standby position of the take-out device is an upper and lower tie bar. After passing between the two, it passes under the sprue and is moved to the vicinity of the front surface of the molded product.

An injection molding machine and a method for taking out a molded product of an injection molding machine according to the present invention include: an injection molding machine having a mold having a plurality of cavities arranged in a horizontal direction; The take-out device is provided with an arm that is turned by the rotation of the rotating shaft, and a suction cup that sucks and holds the molded product is attached to the arm, and the suction cup is held by the mold when the arm is turned. Since it moves to the front of the far side molded product without interfering with the sprue from the stand-by position of the take-out device, even if the take-out device arranged in the injection molding machine is a simple mechanism, the molded product is faster. Etc. can be taken out.

The injection molding machine of the present invention and the method of taking out a molded product of the injection molding machine will be described with reference to FIGS. FIG. 1 is a front view of the light guide plate injection molding machine, the molding die, and the take-out device of this embodiment as viewed from the counter-operation panel side. FIG. 2 is a plan view of the light guide plate injection molding machine, the molding die, and the take-out device of this embodiment as viewed from the upper surface side. FIG. 3 is a view of the movable mold side as viewed from the fixed mold side with respect to the operation of the light guide plate take-out device of the present embodiment.

In this embodiment, the light guide plates Pa and Pb for a mobile phone having a diagonal size of 3 inches, which is a molded product, are molded by injection compression molding, which is one field of injection molding. In injection compression molding, the distance between the movable mold and the fixed mold is variable between the start of molding and the end of molding. Accordingly, the injection compression molding includes a type called an injection press in which the movable mold is moved forward as it is after the molten resin is injected at the stop position after the mold is closed. As shown in FIGS. 1 to 3, an injection molding machine 10 (injection compression molding machine) includes a heating cylinder 12 with a built-in screw, an injection device 14 provided with a nozzle 13, and a mold clamping device 11. It is arranged on the top. The mold clamping device 11 includes four tie bars 19a, 19b, 19c, and 19d between a stationary platen 18 fixed to the bed 16 to which the stationary mold 17 is attached and a pressure receiving plate (not shown) disposed on the bed 16. The movable platen 21 to which the movable mold 20 is attached is movably inserted into the tie bar 19a and the like. The pressure receiving plate is provided with a mold clamping cylinder 15 which is a mold opening / closing / clamping mechanism for performing mold opening / closing and clamping, and a ram 15 a of the mold clamping cylinder 15 is fixed to the back surface of the movable plate 21. In this embodiment, the mold opening / closing / clamping mechanism is an example of a mold clamping cylinder 15 controlled by a servo valve, but may be a toggle mechanism including a servo motor and a ball screw mechanism.

The mold includes a movable mold 20 and a fixed mold 17, and a plurality of molds 20 and 17 having a variable volume and thickness so as to be used for injection compression molding or an injection press are formed between the molds 20 and 17 that have been combined. The cavity is formed in the horizontal direction. The movable mold 20 is provided with a mold body 22, a core 23, 23, a movable frame 24, and the like. Core parts 23, 23 having cavity forming surfaces 23 a, 23 b on the front surface are fixed to the mold main body part 22 so as to be arranged in the horizontal position, and the movable frame part 24 around the core parts 23, 23 is fixed to the mold main body by a spring 25. It is attached to the part 22. Therefore, in the movable mold 20, the core parts 23, 23 and the movable frame part 24 can be relatively repositioned in the mold opening / closing direction.

A runner forming block 26 is formed between the left and right core portions 23 and the core portion 23, and an ejector pin 27 of an ejector device is disposed at a position facing the sprue bush 34 so as to be able to advance and retract. The surface is provided with a biting portion for pulling out the sprue S to the movable mold 20 side. Also, runner forming surfaces 26a, 26a for forming runners R from the vicinity of the biting portion of the runner forming block 26 toward the cavity forming surfaces 23a, 23b are formed to have the same length on both sides. Gate cutters 28 and 28 are disposed between the runner forming surfaces 26a and 26a and the cavity forming surfaces 23a and 23b, respectively, so as to be able to advance and retract. Therefore, as shown in FIG. 3, in the movable mold 20, the cavity forming surfaces 23 a and 23 b are arranged at symmetrical positions around the biting portion of the protruding pin 27 communicating with the sprue S. Also, in the movable mold 20, a cavity cooling medium flow path (not shown) for cooling the cavity forming surfaces 23 a and 23 b, and a runner cooling medium flow path (not shown) for cooling the runner forming surfaces 26 a, 26 a and the protruding pins 27 and the like. These two channels are provided. The movable frame portion 24 of the movable mold 20 is not provided with a mold engaging guide rod or the like that protrudes when the light guide plates Pa and Pb are taken out.

The fixed mold 17 includes a mold main body 31, cavity forming blocks 32 and 32 having cavity forming surfaces 32a and 32b, a runner forming block 33, a sprue bush 34, a fixed gate cutter 35, a contact block 36, and the like. Has been. The sprue bush 34 is a passage for injecting molten resin from the nozzle 13 toward the cavity, and the sprue S formed inside has a taper shape that is thicker toward the movable mold 20 side. When the arm 43 moves, the portion located between the chuck members 46a and 46b at the beginning of the sprue S and the portion gripped by the chuck members 46a and 46b has a diameter of about 2.0 to 4.0 mm. Yes. The length of the sprue S from the biting portion to the tip of the sprue S is 20 to 50 mm. Further, runner forming surfaces 33 a and 33 a are formed on the surface of the runner forming block 33. The fixed gate cutter 35 is disposed between the cavity forming blocks 32, 32 and the runner forming block 33, and is disposed so as to be fitted to the gate cutter 28 of the movable mold 20. Further, in the fixed mold 17, a cavity cooling medium flow path (not shown) for cooling the cavity forming surfaces 32 a and 32 b, and a sprue cooling medium flow path (not shown) for cooling the runner forming surfaces 33 a, 33 a, the sprue bush 34, and the like. These two channels are provided.

Next, the take-out device 40 that constitutes a part of the injection molding machine 10 and takes out the light guide plates Pa and Pb molded from the mold will be described. As shown in FIGS. 1 to 3, the take-out device 40 is provided with a main body 41 on the upper surface of the fixed platen 18 on the side opposite to the operation side (the side opposite to the operation plate). The take-out device 40 is provided with a rotating shaft 42 in the mold opening and closing direction, and a substantially arc-shaped arm 43 as shown in FIG. The rotary shaft 42 is provided so as to be movable back and forth in the axial direction (mold opening / closing direction) by a first servo motor (not shown) incorporated in the main body 41 and a ball screw mechanism. The shaft is rotationally driven by the servo motor, and the arm 43 can perform high-speed turning operation and sudden stop with high accuracy. Therefore, the take-out device 40 is called a swing arm type take-out device. In addition, it is preferable that the position where the take-out device 40 is attached is provided such that the axis of the rotary shaft 42 is slightly inside the upper side of the axis of the tie bar 19a. The take-out device 40 is attached at an angle G between a vertical line V drawn downward from the axis of the rotary shaft 42 and a line T connecting the axis of the rotary shaft 42 and the axis of the sprue S. Is preferably 15 ° to 45 °, more preferably 20 ° to 40 °. The position at which the take-out device 40 is attached depends on the diameter of the suction cup 47 of the take-out device 40, the position where the light guide plate Pa is sucked, and the size of the light guide plate Pa. It is difficult to move the suction cup 47 to the front of the far-side light guide plate Pa when viewed from the standby position H without touching.

The arm 43 of the take-out device 40 that takes out the light guide plates Pa and Pb from the movable mold 20 has a predetermined thickness, and a first member 43a provided in a direction perpendicular to the rotary shaft 42 from the side close to the rotary shaft 42; The second member 43b is connected to the first member 43a at an angle toward the mold direction, and the second member 43b is connected to the second member 43b at an angle toward the mold direction. The third member 43c is a substantially arc-shaped arm member integrated with a smooth curve. The shape of the arm 43 is substantially arc-shaped mainly to avoid interference with the tie bar 19a. However, as long as the arm 43 does not interfere with the tie bar 19a, the tie bar 19b, a safety door (not shown) or the like, it is a polygonal shape having a plurality of sides. Other shapes such as a complete arc shape may be used. The main member of the arm 43 is preferably composed of a member having a specific gravity lighter than iron, and carbon graphite is used in this embodiment. 1 to 3, the arm is not shown in the detailed structure such as an attached air pipe and an electric wire to the electromagnet.

The third member 43c located on the front side of the arm 43 of the take-out device 40 has a long plate shape (including a case of an arc shape) having a surface on the fixed mold side and a surface on the movable mold side, A V-groove 44 is formed on the tip side toward the base side, and branch branches 45a and 45b are formed on both sides of the V-groove 44. In the present embodiment, the branch branch portion 45a on the operation side cavity side (left side in FIG. 3) is longer. A chuck 46 is disposed in the inner space of the V groove 44. The chuck 46 has two chuck members 46a and 46b by an electromagnet type actuating device 46c or an air cylinder disposed on the surface of the fixed mold side closer to the base side than the joint portion of the branch branches 45a and 45b. Opening / closing operation is performed, and the sprue S is gripped or released. A reflective detection sensor (not shown) is disposed on the surface of the movable mold in the vicinity of the joint between the branch branches 45a and 45b. The detection sensor detects whether the sprue S is detected and gripped, and stops the operation of the mold opening / closing and clamping mechanism when the sprue S is not gripped normally.

Further, suction cup mounting members 48a and 48b are mounted on the outer side of the branch branch portion 45a and the outer side of the branch branch portion 45b of the third member 43c on the front side of the arm 43, respectively. The suction cup mounting members 48a and 48b are arranged to have a predetermined length and are aligned with each other, and the suction cups 47 of the respective suction cup mounting members 48a and 48b are connected to the cavity forming surfaces 23a and 48a of the movable mold 20, respectively. It is the space | interval which opposes 23b. The angle E at which the suction cup mounting member 48a is attached to the center line D (and / or the opening direction of the chuck 46) of the third member 43c and the angle F at which the suction cup mounting member 48b is attached to the center line D are: Each is 30 °. The angles E and F substantially coincide with an ascending angle (strictly, an angle between a tangent to the arc and a horizontal line) when the chuck 46 of the take-out device 40 enters the position where the sprue S is sandwiched. The tangent line substantially coincides with the center line D of the third member 46 c when the chuck 46 enters the position where the sprue S is sandwiched. The angles E and F differ depending on the positional relationship between the rotation shaft 42 and the sprue S, and are between the vertical line V drawn downward from the rotation shaft 42 and the line T connecting the rotation shaft 42 and the sprue S. The angle G substantially coincides with 15 ° to 45 °, more preferably 20 ° to 40 °. Therefore, when the chuck 46 is moved to a position where the sprue S can be sandwiched, the suction cups 47 and the chucks 46 of the suction cup mounting members 48a and 48b are positioned side by side in the horizontal direction. It arrange | positions so that it may become the position of centerline W2 of light-guide plate Pa and Pb shape | molded by the cavity. In the portion where the suction cup 47 is disposed, the third member 43c of the arm 43 is a plate having a wider area that covers all front portions of both cavities, and the suction cup is arranged at the above angle with respect to the plate. It may be provided. Furthermore, you may provide the suction cup attachment member branched toward the inner side from the middle part (for example, 2nd member 43b) of the arm 43. FIG.

The suction cup 47 of the take-out device 40 is fixed to the suction cup mounting members 48a and 48b via springs 47a, and an air tube connected to a vacuum device (not shown) is provided, so that the suction surface 47b of the suction cup 47 is in a negative pressure state. Thus, the light guide plates Pa and Pb, which are molded products, can be sucked. In the present embodiment, the suction cup 47 is provided with a bellows portion in front of the main body portion, and has a cup-shaped suction surface 47b at the tip thereof. The diameter of the main body of the suction cup 47 is 10 to 15 mm, and the diameter of the suction surface 47b is 8 to 12 mm. The diameter of the suction surface is appropriately selected according to the size and weight of the light guide plate. As the material of the suction cup 47, heat-resistant silicon rubber, fluorine rubber, urethane rubber, nitrile rubber or the like is used, but porous rubber or the like may be used. On the bed 16, there is provided a delivery device (not shown) of a swivel arm type that receives the light guide plates Pa and Pb carried out from the take-out device 40 at a delivery position and conveys them to a belt conveyor (not shown). Therefore, in the delivery device, the suction cup provided on the swivel arm is directed to the fixed platen side at the delivery position, and the swivel arm shaft is turned 90 ° so that the sucker of the swivel arm faces downward at the open position near the belt air. ° Can be rotated.

Next, molding of the light guide plates Pa and Pb by the injection molding machine 10 and extraction of the light guide plates Pa and Pb by the take-out device 40 arranged in the injection molding machine 10 will be described. First, the mold clamping cylinder 15 is operated, and the mold is closed by bringing the movable mold 20 attached to the movable board 21 into contact with the fixed mold 17 attached to the fixed board 18. At that time, the front surface of the movable frame portion 24 of the movable mold 20 and the front surface of the contact block 36 of the fixed mold 17 are brought into contact with each other, the spring 25 is compressed, and the movable frame portion 24 is finally moved against the core portions 23 and 23. It will be a retreated position. A runner including a variable thickness gate and a variable thickness cavity connected to the gate are formed between the fixed mold 17 and the movable mold 20.

Next, the molten resin is injected from the nozzle 13 of the injection device 14 through the sprue bush 34. The movable plate 21 and the core portions 23 and 23 of the movable mold 20 are slightly retracted by the pressure at the time of injection. As a result, the movable frame portion 24 of the movable mold 20 is positioned relatively forward of the core portion 23, and the cavity forming surfaces 32 a and 32 b of the fixed mold 17 and the cavity forming surfaces 23 a and 23 b of the movable mold 20 are arranged. The distance of is widened compared to the position where the initial clamping force is exerted as shown in FIG. As a result, the molten resin can be injected into the cavity having a large cross-sectional area, and the flow loss of the molten resin can be reduced. In the present invention, since a plurality of cavities are formed in the horizontal direction, molten resin is supplied to each cavity in a well-balanced manner.

When the screw position of the injection device 14 reaches a predetermined holding pressure switching position, the injection control is switched to the holding pressure control. Simultaneously with or before and after the holding pressure switching, the mold clamping force of the mold clamping cylinder 15 is rapidly increased, and the molten resin in the cavity is compressed. At the same time or before and after the holding pressure switching, the gate cutters 28 and 28 are moved forward and intersect with the fixed gate cutters 35 and 35 of the fixed mold 17 to cut the gate. After the gate is cut by the gate cutters 28, 28, the holding pressure does not reach the molten resin in the cavity from the injection device 14 side, but the core of the movable mold 20 is driven by the clamping cylinder 15. As the parts 23 and 23 are advanced, the molten resin in the cavity is compressed. After the gate cut is performed, the molten resin in the cavity becomes a cooling step (cooling of the molten resin itself starts from the start of injection). In the meantime, the molten resin used for the next molding is measured in the heating cylinder 12 of the injection device 14. Then, before the end of the cooling time, supply of mold release air to the cavity is started from the air passage between the cavity forming blocks 32, 32 and the contact block 36 of the fixed mold 17 and immediately before the mold opening. After that, supply of mold release air to the cavity is started from the air passage between the core parts 23 and 23 of the movable mold 20 and the movable frame part 24.

Next, the mold clamping cylinder 15 is operated to perform pressure relief, and then the movable platen 21 and the movable mold 20 are moved to open the mold. When the mold opening is started, the sprue S including the runner R is biting into the biting portion at the tip of the protruding pin 27 of the movable mold 20, so that the sprue 34 of the fixed mold 17 is pulled out. The light guide plates Pa and Pb are also opened while being held by the cavity forming surfaces 23a and 23b because the cavity of the movable mold 20 has a concave mold shape. Accordingly, the sprue S including the gate-cut runner R and the light guide plates Pa and Pb are held in a state where they are separated from each other by the movable mold 20 and moved in the mold opening direction.

Then, in response to the mold opening completion signal transmitted when the mold opening is completed, or when the rotating shaft 42 of the take-out device 40 is viewed from the movable mold 20 side to the stationary platen 18 side in the middle of mold opening, the counterclockwise direction (see FIG. 3, the arm 43 is rotated in the vicinity of the front surface of the movable mold 20. And the chuck | zipper 46 attached to the front side of the arm 43 by the turning of the arm 43 is moved to a position where the sprue S can be sandwiched between the chuck members 46a and 46b. At the same time, the suction cups 47 attached to the front side of the arm 43 are moved from the standby position H to the front positions of the light guide plates Pa and Pb, and the turning is stopped. At this time, the movement trajectory of the chuck 46 is moved so as to draw a circle around the rotation shaft 42 as shown in FIG. 3, and passes between the upper and lower tie bars 19a and 19b to sandwich the sprue S. It is moved to a position where it can.

In the take-out device 40, the axis of the rotary shaft 42 on the fixed platen 18 is provided on the side opposite to the operation side (inside) from above the axis of the tie bar 19a. The movement trajectory on the distal end side of the arm 43 has a position immediately below the rotation shaft 42, a position where the distal end side of the arm passes the lowermost position, and then the arm 43 is raised. In this embodiment, the angle when the chuck 46 on the front side of the arm 43 enters the position where the sprue S can be sandwiched is 30 ° with respect to the horizontal direction (more precisely, the angle at which the arc tangent and horizontal line intersect) 30 °). Since the chuck 46 can be moved directly from the side of the sprue S to a position where the sprue S can be sandwiched, there is little loss during movement. When the arm 43 reaches a stop position (a position where the sprue S can be sandwiched), the detection sensor detects whether the sprue S is normally positioned between the chuck members 46a and 46b.

Further, when the arm 43 is turned, the suction cup mounting members 48a and 48b and the suction cup 47 fixedly attached to the arm 43 maintain a certain angle with respect to the third member 43c as shown in FIG. It is moved as it is and reaches the front surfaces of the light guide plates Pa and Pb, respectively. At this time, the suction cup 47 that takes out the light guide plate Pa on the far side (operation panel side) when viewed from the standby position H draws a movement locus that rises again after passing under the sprue S, and thus does not interfere with the sprue S. It can move to the front of the light guide plate Pa. When the chuck 46 reaches a position where the sprue S can be sandwiched, the suction cup 47 is moved in front of the light guide plates Pa and Pb, and the arm 43 is stopped, the rotating shaft 42 is moved in the mold opening direction (right side in FIG. 1). The suction surface 47b of the suction cup 47 is brought into contact with the light guide plates Pa and Pb, and the chuck members 46a and 46b are closed to hold the sprue S. Further, before the chuck members 46a and 46b are closed and the sprue S is gripped, the protruding pin 27 is advanced so that the sprue S including the runner R can be easily taken out from the biting portion.

Since air suction from the suction cup 47 by a vacuum device (not shown) is performed before contact with the light guide plates Pa and Pb, the light guide plates Pa and Pb are sucked simultaneously with the contact of the suction cup 47. The suction force at that time is about −50 to −120 kpa, and is a relatively weak suction force so as not to leave a mark on the light guide plates Pa and Pb having a high temperature immediately after molding. In this embodiment, by moving the take-out device 40 as described above, until the light guide plates Pa and Pb are adsorbed as compared to using a horizontal-moving take-out device as shown in FIG. Can be shortened.

When the suction plate 47 sucks the light guide plates Pa and Pb and the chuck 46 grips the sprue S including the runner R, the take-out device 40 slightly moves the rotating shaft 42 and the arm 43 again in the mold closing direction. The light guide plates Pa and Pb are released from the cavity forming surfaces 23a and 23b, and the sprue S including the runner R is removed from the biting portion at the tip of the protruding pin 27. Supply of release air in the movable mold 20 is also performed during release of the light guide plates Pa and Pb and the sprue S including the runner R by the take-out device 40, and assists release of the light guide plates Pa and Pb and the like. . Note that the light guide plate may be more easily taken out by opening a part of the movable frame portion 24 of the movable mold outward or by advancing the cavity forming surface.

Next, the rotation shaft 42 of the take-out device 40 is rotated clockwise (counterclockwise in FIG. 3), and the arm 43 moves in the opposite direction on the same trajectory as when entering, so that the upper and lower sides of the injection molding machine 10 are moved up and down. It is moved from the tie bar 19a, 19b to the carry-out position (delivery position) and taken out. Needless to say, the light guide plates Pa and Pb sucked and held by the suction cup 47 are designed not to contact the tie bars 19a and 19b. Then, the surface of the light guide plates Pa and Pb that is not attracted to the suction cup 47 is attracted to the suction cup of the delivery device (not shown), and the suction by the suction cup 47 of the take-out device 40 is released. At this time, the take-out device 40 is slightly moved in the mold opening direction, or the delivery device is slightly moved in the mold closing direction. Then, the light guide plates Pa and Pb are conveyed to the belt conveyor by the delivery device. The take-out device 40 is moved toward the standby position H when the carry-out position and the standby position H are different. In the series of movements of the take-out device 40, the sprue S is delivered to the light guide plates Pa and Pb, and then the chuck members 46a and 46b of the chuck 46 are opened and dropped to a lower box or the like. However, the timing and position at which the sprue S is released from the chuck 46 may be an appropriate timing and position as long as the sprue S is not in contact with the light guide plates Pa and Pb, and the sprue S may be sucked by vacuum. Further, the sprue S held in the movable mold 20 is not taken out by the chuck 46 of the take-out device 40, but is dropped or taken out by a separate mechanism after the light guide plates Pa and Pb are taken out by the take-out device 40. It may be a thing.

Next, a case where the mold of the injection molding machine 10 is replaced and the arrangement of the cavities and the size of the cavities are changed will be described. In most molds using a cold runner, the position of the sprue is not changed. And when the position of a sprue is not changed, the arrangement position of the suction cup 47 is adjusted according to the space | interval from a sprue to a molded product, and the magnitude | size of a molded product. Further, when the molded product is changed to a large one and contacts the tie bar at the time of extraction, the height of the extraction device 40 (the height of the rotating shaft 42) is adjusted. At that time, it is necessary to change the arrangement angle of the suction cup 47 row on the front side of the arm 43. In addition, in a mold using a hot runner, the position of the sprue may be changed. In this case, the horizontal mounting position of the take-out device 40 on the fixed platen 18 and the height of the take-out device 40 (the rotation shaft 42) are used. Height) and the arrangement angle of the 47 rows of suction cups are changed and adjusted.

In the present embodiment, the molding of the light guide plates Pa and Pb is speeded up, the time from the completion of mold closing to the start of mold opening through injection is within 4.2 seconds, the light guide plates Pa and Pb from the start of mold opening to It is possible to perform molding within a time period of 1.8 seconds or less after completion of the removal, a removal time of 0.15 to 0.7 seconds by the removal device 40, and a total molding cycle time of 6 seconds or less. And since the mold opening time was shortened, the degree to which the cavity forming surfaces 23a, 23b, 32a, 32b were cooled at room temperature was reduced, and good results were obtained in molding.

The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and it goes without saying that those skilled in the art also apply modifications made in accordance with the spirit of the present invention. is there. As for the swing arm type take-out device of the injection molding machine 10, it is sufficient that at least the arm 43 is swiveled, and the entire arm 43 does not move in the mold opening / closing direction and includes a suction cup 47 attached to the arm 43. Only the mold may be moved in the mold opening / closing direction. Further, the mounting position of the take-out device 40 in the injection molding machine 10 is not limited to the fixed platen 18 and may be provided on the base on the bed 16 or the tie bar 19a. The rotating shaft of the take-out device may be provided below the lower tie bar 19b, and the suction cup may pass above the sprue and move forward of the operating-side cavity by turning the arm.

In addition, the present invention is particularly useful when the light guide plates Pa and Pb, which become defective when the suction mark remains on the surface to be sucked, is taken out at a high speed, but injection molding (injection compression molding) is performed at a relatively high cycle. If so, it is also useful for other molded articles other than the light guide plate. The material used for the molded product may also be other materials such as metals and ceramics in addition to various resins. In addition, the mold of the injection molding machine can be another inlay type compression mold or a normal cavity with a constant volume as long as it has a plurality of cavities in the horizontal direction around the sprue. It may be a mold. Further, regarding the arrangement of the cavities of the mold of the present invention, the horizontal direction may include a case where it is substantially horizontal, and either one may be on the upper side in a range up to about 5 °. Further, the number of cavities disposed in the mold is not limited to two, and two cavities such as four cavities may be disposed in a horizontal direction or a radial direction via a runner. In the present embodiment, the sprue S and the light guide plates Pa and Pb, which are molded products, are gate-cut and separated in the mold. However, as long as the molded product is adsorbed and taken out by the suction cup of the take-out device. The molded product and the sprue may be integrated and not separated, and in that case, either the case where the chuck is provided in the take-out device or the case where it is not provided may be used.

It is the front view which looked at the injection molding machine of the light-guide plate of this embodiment, the shaping die, and the taking-out apparatus from the counter operation panel side. It is the top view which looked at the injection molding machine of the light-guide plate of this embodiment, the shaping die, and the taking-out apparatus from the upper surface side. It is the figure which looked at the movable mold side from the fixed mold side regarding the action | operation of the taking-out apparatus of the light-guide plate of this embodiment. It is a figure which shows the movement of the conventional horizontal movement type taking-out apparatus. It is a figure which shows the principal part of the conventional horizontal movement type taking-out apparatus of another form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Injection molding machine 17 Fixed metal mold | die 19a, 19b, 19c, 19d Tie bar 20 Movable metal mold 23a, 23b, 32a, 32b Cavity formation surface 40 Extraction device 42 Rotating shaft 43 Arm 46 Chuck 46a, 46b Chuck member 47 Suction cups 48a, 48b Suction cup mounting member P Light guide plate S Sprue

Claims (6)

In an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached,
In the take-out device of the molded product arranged in the injection molding machine,
An arm that is turned by the rotation of the rotating shaft is provided,
A suction cup for adsorbing and holding a molded product is attached to the arm,
The injection is characterized in that when the arm is swung, the suction cup is moved to the front of the far-side molded product as viewed from the standby position of the take-out device without interfering with the sprue held by the mold. Molding machine. In an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached,
In the take-out device of the molded product arranged in the injection molding machine,
An arm that is turned by the rotation of the rotating shaft is provided,
A suction cup that holds the molded product by suction and a chuck that holds the sprue are attached to the arm,
When the arm is swung, the suction cup is moved to the front of the molded product on the far side as viewed from the standby position of the take-out device without interfering with the sprue held by the mold, and the chuck is An injection molding machine characterized by being moved from a side to a position where a sprue can be sandwiched. The injection molding machine according to claim 1 or 2, wherein at least one of the suction cups is held in contact with a center line of the molded product. In the method of taking out a molded product of an injection molding machine that takes out a molded product from an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached.
In the take-out device of the molded product arranged in the injection molding machine,
An arm that is turned by the rotation of the rotating shaft is provided,
A suction cup for adsorbing and holding a molded product is attached to the arm,
The injection is characterized in that when the arm is swung, the suction cup is moved to the front of the far-side molded product as viewed from the standby position of the take-out device without interfering with the sprue held by the mold. How to take out the molded product from the molding machine. In the method of taking out a molded product of an injection molding machine that takes out a molded product from an injection molding machine to which a mold having a plurality of cavities arranged in a horizontal direction is attached.
In the take-out device of the molded product arranged in the injection molding machine,
An arm that is turned by the rotation of the rotating shaft is provided,
A suction cup that holds the molded product by suction and a chuck that holds the sprue are attached to the arm,
When the arm is swung, the suction cup is moved to the front of the molded product on the far side as viewed from the standby position of the take-out device without interfering with the sprue held by the mold, and the chuck is A method for taking out a molded product of an injection molding machine, wherein the product is moved from a side to a position where a sprue can be sandwiched. The suction cup that takes out the molded product on the far side when viewed from the standby position of the take-out device is
6. The method of taking out a molded product of an injection molding machine according to claim 4 or 5, wherein the molded product is moved near the front surface of the molded product after passing through between the upper and lower tie bars. .

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