JPH0438212B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a synthetic resin injection molded product take-out device of synchronized mold opening type.

[Prior art and its problems]

Synthetic resin injection molded products (hereinafter referred to as workpieces)
A special ejection device is used to eject the material from the mold. In this ejection device, a chuck is attached to the tip of a chuck arm that performs rotating and reciprocating movements. When the mold is opened, the chuck enters between the molds and is ejected onto the surface of the moving mold by an ejector pin. Check and take out the finished workpiece. Therefore, the distance between the surface of the movable mold and the chuck must be kept constant for each ejection operation. For this reason, in the conventional mold opening synchronized take-out device, the take-out device is installed on a moving plate to which a movable mold is attached, and the take-out device is moved together with the moving plate, so that the above distance does not fluctuate. I have to. However, when the take-out device is installed on the moving plate, the entire weight of the take-out device is placed on the moving plate, which is a moving body.
Furthermore, vibrations and shocks generated during the operation of the take-out device are transmitted to the injection molding machine, which adversely affects maintaining the accuracy of the injection molding machine. Therefore, there are problems in that maintenance is time-consuming and that the dimensional accuracy of the workpiece is adversely affected.

Next, workpieces such as compact discs and visual discs are injection molded in a clean room to avoid dust adhesion during the molding process as much as possible. This clean room is
Clean air is blown down from the ceiling towards the floor, and dust is collected below. By the way, it is unavoidable that dust is generated from the extraction device, which has many moving parts.
Since the take-out device is disposed on the moving plate, there is a problem that this dust may adhere to the work while falling.

In addition, if the chuck starts advancing after the mold opening is completed, chucks the workpiece, moves out from between the molds, and then closes the mold, the molding cycle becomes longer, so moving the mold and chuck's approach movement are progressing at the same time. Therefore, the chuck moves diagonally as a result of the combination of mold opening and advancing movements. Therefore, at the moment when the chuck leaves the space between the molds, the distance between the surface of the fixed mold and the chuck is very small. It is necessary to increase the distance to prevent the retracted workpiece from colliding with the mold, which ultimately lengthens the molding cycle.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an injection molded product removal device that can operate accurately and quickly without adversely affecting the injection molding machine, can perform clean molding, and can shorten the molding cycle. That is.

[Structure of the invention and its effects]

The mold opening synchronous type injection molded product retrieval device of the present application is as follows:
A base disposed below or to the side of the mold of an injection molding machine, and a base disposed so as to be slidable on this base,
A first plate is connected to a moving plate of an injection molding machine and moves on the side of the mold in a mold opening direction, and a stator is arranged to be slidable on the first plate and protrudes from a base. a second plate that moves along a curved trajectory by a slider link mechanism that engages with a long hole provided in one piece of the L-shaped link that is rotatably fixed to the first plate; and a second plate that is disposed on the second plate. It consists of a chuck mechanism, and the second
The slide width and stop position of the plate are regulated by a pair of stoppers, and a buffer air cylinder is used on the second plate side link of the slider link mechanism to eliminate variations in the mold opening distance caused by the injection molding machine. The air cylinder is absorbed, and the chuck enters between the molds and retreats in a curved trajectory nearly perpendicular to the mold opening direction.

That is, first, the first plate is connected to the movable plate of the injection molding machine and slides on the side of the mold in the mold opening direction in conjunction with the mold opening, so the distance between the surface of the movable mold and the chuck is always constant. It does not change. Since the stator protruding from the machine base engages with a long hole provided in one piece of the L-shaped link rotatably fixed to the first plate, when the first plate slides, the L-shaped link rotates, and the second plate also slides by the slider link mechanism, but since the L-shaped link rotates while moving linearly, the second plate slides based on a curved trajectory. Therefore, when each dimension of the link mechanism is set to a predetermined value, the chuck can enter and exit between the molds along a curved trajectory close to a straight line perpendicular to the mold opening direction, allowing it to handle deep workpieces. Even when molding, there is no need to increase the mold opening distance, and the mold can quickly enter and exit between the molds, making it possible to shorten the molding cycle. Since the base is placed below or to the side of the mold, the weight of the take-out device is not placed on the moving plate, and
Since vibrations and shocks during the operation of the take-out device are not transmitted, the accuracy of the injection molding machine is maintained and the dimensional accuracy of the workpiece is not adversely affected. Furthermore, all the mechanical parts of the ejector are located lower than the mold, so the generated dust does not adhere to the workpiece.
Clean molding can be achieved.

Next, since the mold opening distance of the mold varies, the sliding amount of the second plate that is interlocked with the mold opening by the link mechanism also varies. Therefore, the position of the chuck is deviated from the center of the mold.
Therefore, a buffer air cylinder is used in the link on the second plate side of the link mechanism, so that the sliding width of the second plate is regulated to a constant level by a pair of stoppers. As a result, the stopping position of the second plate becomes constant, and even if the mold moves further after the second plate stops, and the amount of movement varies, the piston rod of the air cylinder will expand accordingly. to absorb variations. Furthermore, if the air in the buffer air cylinder on the second plate side is switched so that pressure is applied from the opposite direction, the piston rod will extend out of the cylinder, and the second plate will not slide even when the mold is opened. Therefore, the chuck mechanism does not enter between the molds, which is convenient during maintenance and inspection.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

As shown in FIG. 1, a fixed plate 91 and a movable plate 92 of the injection molding machine are arranged facing each other,
A fixed mold 93 and a movable mold 94 are attached to each. Molten synthetic resin is injected into the cavity of the mold by the injection nozzle 95 on the back side of the fixed plate 91, and when solidification is completed, the mold is opened and the workpiece W is transferred to an ejector pin (not shown) attached to the movable mold 94. Therefore, it is ejected onto the surface of the movable mold 94. The workpiece W is, for example, a compact disk, and is molded using an injection molding machine installed in a clean room in order to prevent dust from adhering during the molding process.

The base 1 of the extraction device is arranged below or to the side of the plates 91 and 92. A pair of rails 11 are laid on the upper surface of the base 1 in the opening direction of the mold, and the first plate 2 is slidably disposed along the rails 11. The first plate 2 includes a connecting member 21 as shown in FIG.
It is connected to the movable plate 92 by a movable plate 92, and slides in conjunction with this when the mold is opened. A pair of rails 22 are laid on the upper surface of the first plate 2 at right angles to the opening direction of the mold.
A second plate 3 is slidably disposed along 2.

This second plate 3 is moved in conjunction with mold opening by a link mechanism formed by a slider crank chain shown in FIGS. 3 and 4. To explain this link mechanism, an L-shaped link 41 bent at a right angle is rotatably fixed to the first plate 2 by a pin 42. A long hole 44 is formed in one side of the L-shaped link 41, and a stator 47 protruding from the base 1 is engaged with this long hole 44.
Therefore, when the first plate 1 slides in conjunction with mold opening, the L-shaped link 41 rotates. A piston rod of a buffer air cylinder 43 is attached to a pin 46 on the other side of the L-shaped link 41.
The air cylinder 4 is rotatably connected by the air cylinder 4.
The proximal end of the plate 3 is fixed to the second plate 3 by a bracket 45 so as to be freely swingable. Here, the air pressure in the air cylinder 43 is biased in the direction opposite to the direction of the force exerted by the link mechanism on the piston rod, so that even if the force necessary to slide the second plate 3 is applied to the piston rod, the piston rod does not move. , which acts as a rigid link. Therefore,
When the first plate 2 slides in conjunction with the mold opening, the L-shaped link 41 rotates around the pin 42, and the second plate 3 slides along the rail 22.

A pair of stoppers 23 are provided on the first plate 2,
23 is provided, and on the other hand, a projection 31 is provided on the lower surface of the second plate 3, and when this projection 31 abuts against the stoppers 23, 23, the second plate 3
The sliding range and stop position of the plate 3 are regulated. This sliding range is set slightly smaller than the range that slides in conjunction with the normal mold opening distance, and even after the protrusion 31 collides with the stoppers 23, 23, the second plate is moved in conjunction with the mold opening. 3
continues to slide slightly. Therefore, the L-shaped link 41 also continues to rotate, but at this time the piston rod of the air cylinder 43 moves a little against the air pressure and absorbs the rotation of the L-shaped link 41.

Next, to explain the chuck mechanism, as shown in FIG. 1 and FIG. It is provided to be freely pivotable, and is pivoted as shown in FIG. 2 by a drive mechanism (not shown). At the tip of this chuck arm 52, there is a chuck 53 made of a suction cup.
is attached, and a suction cup is attached to the surface of the workpiece W to chuck it. In addition,
The chuck mechanism is omitted in FIGS. 3 and 4.

When the mold is closed and molten synthetic resin is injected, the link mechanism is in the state shown in FIG. 4, and the first plate 2 is connected to the fixed plate 91.
The second plate 3 is moved to the side and moved away from the mold. The chuck arm 52 then turns in a direction away from the mold, discharges the workpiece W, returns to the mold, and waits. Next, when the synthetic resin solidifies and the mold is opened, the first plate 2 slides in conjunction with the moving plate 92, so the L-shaped link 41 rotates counterclockwise around the pin 42. Therefore, the second plate 3 rail 22
It slides along the arrow to reach the state shown in Fig. 3.
Here, to explain the slide locus with reference to FIG. 5, the pin 42 which is the rotation center of the L-shaped link 41
moves along a straight line trajectory from A ₁ to A ₂ , so the pin 46 at the tip of the L-shaped link 41 moves along an elliptical trajectory from B ₁ to B ₂ due to the combination of linear motion and rotational motion. Therefore, the bracket 45 which is the center of swing of the air cylinder 43, that is, the second plate 3
moves along a curved trajectory from C ₁ to C ₂ , but this trajectory is sharper than the elliptical trajectory from B ₁ to B ₂ because the distance in the mold opening direction is equal to the distance from A ₁ to A ₂ . At the beginning, the trajectory is more parallel to the mold opening direction, but at the end, it becomes more perpendicular to the mold opening direction. In this embodiment, the elongated hole 44 of the L-shaped link 41 is linear, but if it is made into an arc, the curved trajectory from C ₁ to C ₂ can be further changed.

Next, just before the mold opening is completed, as mentioned above, regardless of the variation in the amount of mold opening, the second plate 3
is accurately stopped at a predetermined position by the action of the stopper 23 and the buffer air cylinder 43. Therefore, since the chuck pedestal 51 moves along a curved trajectory in conjunction with the opening of the mold, the chuck 53 quickly enters between the molds after turning toward the mold, but the second plate 3 is not in the correct position. Since it is stopped, the chuck 53 always stops at the center of the movable mold 94, and the suction cup attracts the surface of the workpiece W to accurately chuck it. The operation when clamping the mold is opposite to this, and at this time too, it operates quickly, but the chuck 53 moves on a parabolic trajectory from C ₂ to C ₁ in FIG. Therefore, the chuck 53 retreats from between the molds along a curved trajectory close to a straight line perpendicular to the mold opening direction.

Also, during maintenance and inspection, the air in the buffer air cylinder 43 is switched so that pressure is applied from the opposite direction. This allows the piston rod to extend out of the cylinder, and even if the first plate 2 slides, the piston rod extends out of the cylinder and the link mechanism does not work, so even if the mold is opened, the second plate 3 does not move and the chuck 53 does not enter between the molds.

In this way, since the base 1 is placed below or to the side of the mold, the weight of the take-out device is independent of the moving plate 92, and since the center of gravity of the take-out device is at a low position, the weight of the take-out device is reduced during operation. Since the vibration shock is small and is not transmitted to the injection molding machine, the accuracy of the injection molding machine is maintained and the dimensional accuracy of the workpiece W is not adversely affected. Furthermore, since all the mechanical parts of the take-out device are located at a lower level than the mold, the dust generated by the take-out device is immediately sucked into the dust collector installed below. Therefore, clean molding can be achieved without adhesion to the workpiece W. Then, the chuck 53 can be moved out of the mold along a curved trajectory close to a straight line perpendicular to the mold opening direction, and there is no need to increase the mold opening distance even when molding a deep workpiece W. Molding cycle can be shortened. In a mold opening synchronous type take-out device, when the mold opening distance is increased, the chuck 53
Since the moving distance of the chuck 53 also increases, the moving speed of the chuck 53 must be increased, and a large shock is applied when stopping, which shortens the life of the sliding part. Since there is no need to increase the mold opening distance when molding, it also has the advantage of eliminating this problem.

〔Effect of the invention〕

As explained above, the injection molded product removal device of the present invention has a base placed below or to the side of the mold,
The chuck mechanism moves in a curved trajectory in conjunction with the mold opening, quickly entering between the molds and leaving the mold, so it can operate accurately and quickly without adversely affecting the injection molding machine, and can achieve deep It is possible to provide an injection molded product take-out device that does not extend the molding cycle even when molding a workpiece, and can perform clean molding.

[Brief explanation of drawings]

FIG. 1 is a side view, FIG. 2 is a front view, FIGS. 3 and 4 are illustrations of the link mechanism, and FIG. 5 is an illustration of the locus. 1... Base, 2... First plate, 3... Second
Plate, 23...Stopper, 41...L-shaped link, 42, 46...Pin, 43...Buffer air cylinder, 44...Long hole, 45...Bracket, 47...Stator, 53...Chick ,
91...fixed plate, 92...movable plate,
93...Fixed mold, 94...Moveable mold, W...Work.

Claims (1)

[Claims] 1. A base disposed below or to the side of a mold of an injection molding machine, and a base disposed so as to be slidable on this base and connected to a movable plate of the injection molding machine to move the mold. a first plate that moves laterally in the mold opening direction;
arranged so as to be slidable on this first plate,
a second plate that moves along a curved trajectory by a slider link mechanism in which a stator protruding from the base engages with a long hole provided in one piece of the L-shaped link rotatably fixed to the first plate; , a chuck mechanism disposed on the second plate, the slide width and stop position of the second plate are regulated to a constant level by a pair of stoppers, and a chuck mechanism is provided on the second plate side link of the slider link mechanism. Air cylinder for buffer is used,
The buffer air cylinder absorbs variations in mold opening distance due to the injection molding machine, and the chuck enters and leaves between the molds in a curved trajectory close to a straight line perpendicular to the mold opening direction. Synchronous opening type injection molded product removal device.