JP2000071259A - Molding ejecting device and method for ejecting holding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for ejecting a molding which can eject/drop the molding surely by a simple constitution and an apparatus for the method. SOLUTION: A first ejector plate 11 which supports an ejector sleeve 1 and a second ejector plate 12 which supports an ejector pin 2 are arranged forward/ backward movably between a mold M and a fitting plate 10. An auxiliary ejector rod 16 and a guide pin 20 are fitted on the back of the first ejector plate 11. In the guide pin 20, a stopper 23 which can engage with a step part 22 is fitted at a position separated by a prescribed distance L. When a knock-out rod 19 is ejected forward, the ejector sleeve 1 is ejected, and when the stopper 23 of the guide pin 20 engages with the step part 22, the first ejector plate 11 and the second ejector plate 12 are moved forward. The ejector pin 2 is ejected further than the ejector sleeve 1 by a hydraulic cylinder 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article ejection device and a molded article ejection method, and more particularly, to a molded article ejection method.
The present invention relates to a molded product ejection device and a molded product ejection method for removing a molded product molded by an injection molding machine or the like from a mold.

[0002]

2. Description of the Related Art For example, an injection molding machine generally includes a mold comprising a fixed mold and a movable mold, a mold clamping device for opening and closing the mold and press-clamping at the time of injection filling, and a resin material having a predetermined shape. An injection device that heats and kneads to the temperature and injects and injects molten resin into the cavity in the closed mold is provided.When the molten resin injected and filled in the cavity is solidified, the mold is opened and molded. The molded product is taken out by the product ejection device.

[0003] A molded product ejecting device in a conventional injection molding machine or the like includes an ejector member (release member) having a pin shape or a sleeve shape provided so as to be able to eject a molded product from a mold surface, and an ejector. There has been provided a knockout mechanism that protrudes and drives a member. When taking out a molded product in a mold using such a molded product ejection device, in order to reduce the molding cycle time, the molten resin injected and cooled is cooled in the cavity to the extent that it does not deform. After solidifying, the mold is opened so that the molded product remains on the surface of the mold on one side where the ejector member is provided, and the ejected member is protruded by the knockout mechanism to remove the adhered molded product from the mold surface. It is released by dropping it onto a shooter.

In such a molded product ejecting apparatus, the ejector member is ejected in a state where the molded product is solidified so as not to be deformed, so that the so-called biting or holding of the tip of the ejector member of the molded product is caused. May not fall easily on the chute. For this reason, the ejector member is repeatedly protruded until it is considered that the molded article is surely dropped, thereby giving vibration to drop the molded article.

[0005]

In the above-mentioned prior art, a molded article cannot be reliably dropped.
It took time per molding cycle time to repeatedly eject the ejector member, and it was not possible to improve the production cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a molded product ejecting apparatus and a molded article ejecting method capable of reliably ejecting and dropping a molded product with a simple configuration. I do.

[0007]

According to a first aspect of the present invention, there is provided a molded article ejecting apparatus which is provided so as to be capable of ejecting a molded article from a mold surface in order to achieve the above object. A molded article dropping member provided so that the tip can protrude further than the protruded tip of the release member, and a delay moving means for delaying the release of the release member and following the molded article falling member. It is characterized by having.

According to a second aspect of the present invention, there is provided a method for projecting a molded product, wherein the molded product is released from the surface of the mold by projecting a release member, and thereafter, from a tip of the release member. Is characterized by further protruding the tip of the molded article falling member.

According to the first aspect of the present invention, the molded article is released from the surface of the mold by projecting the release member, and the molded article falling member is moved by the delay moving means with a delay in further protruding the release member. Then, the tip of the molded article falling member is further protruded than the protruded tip of the release member. Even if the molded product bites or clings to the tip of the release member, the molded product is reliably dropped by the molded product dropping member.

According to the second aspect of the present invention, the molded article is released from the mold surface by ejecting the release member prior to the ejection of the molded article dropping member, and then follows the further ejection of the release member. Then, the molded article falling member is moved. Then, when the tip of the molded article dropping member is further protruded than the tip of the release member, even if the molded article bites or is hugged by the tip of the release member, the molded article is reliably held by the molded article dropping member. To fall.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a molded article ejecting apparatus according to the present invention will be described in detail with reference to FIGS. In this embodiment, a case where the molded product ejection device is provided on the movable side of the mold M in the injection molding machine will be described. Also, in this description,
"Front" means the surface of each member on the side of the molded product, similarly "front" indicates the left side in the drawing, "rear" means the side opposite to the molded product, and similarly "rear". "Indicates the right side in the figure. The molded product ejecting apparatus of the present invention generally includes a release member 1 provided so as to be able to eject a molded product S from a surface of a mold M, and a tip further than the protruded tip of the release member 1. The molded article dropping member 2 is provided so as to be able to protrude, and a delay moving means (described later) for following the molded article dropping member 2 with a delay to the ejection of the release member 1.

In this embodiment, the release member 1 is formed in a hollow sleeve shape, and will be referred to as an ejector sleeve 1 in the following description. Also, the molded article falling member 2
Is formed in a pin shape, and is referred to as an ejector pin 2 in the following description. The ejector pins 2 are concentrically fitted and arranged in the ejector sleeve 1 so as to be movable in the axial direction.

The movable mold M is provided so as to move toward and away from the fixed mold (not shown). The position of the mold M in the figure is
This shows a state in which the mold has been moved away from the fixed mold and the mold opening has been completed. On the back surface of the mold M, a mounting plate 10 is fixedly arranged at a predetermined distance. A first projecting plate 11 supporting the ejector sleeve 1 and a second projecting plate 12 supporting the ejector pins 2 are provided between the mold M and the mounting plate 10 in the front-rear direction (the horizontal direction in the drawing).
Are movably arranged.

In the mold M, a through hole 15 into which the ejector sleeve 1 carrying the ejector pin 2 is inserted is inserted in a direction substantially perpendicular to the surface of the mold M and substantially in the center of the molded product S. The ejector sleeve 1 and the ejector pin 2 are formed such that the tips thereof match. The base end (the right side in the figure) of the ejector sleeve 1 is attached so as to extend toward the front of the first protrusion plate 11. A screw portion 16a formed at the front end of the ejector assisting rod 16 is screwed and fixed to the back surface of the first ejector plate 11, and the ejector assisting rod 16 is formed on the second ejector plate 12 and the mounting plate 10. The rear end face 16b of the knockout rod 1 is inserted into the through holes 17 and 18 and extends rearward.
9. When the knockout rod 19 is protruded forward, the first protruding plate 11 is moved forward via the ejector auxiliary rod 16, and the first protruding plate 11 is moved.
Ejector sleeve 1 attached so as to extend forward of the mold M protrudes to release the molded product S from the surface of the mold M.

A screw portion 20a formed at the front end of the guide pin 20 is screwed and fixed to the back surface of the first protruding plate 11. The guide pin 20 is inserted into a guide hole 21 formed in the second protruding plate 12. Guide hole 2
1, a step 22 is formed on the back side.
2, a stopper 23 is provided at a position separated from the step 22 at the rear end of the guide pin 20 by a predetermined distance L. When the knockout rod 19 is pushed forward,
The guide pin 20 is also moved forward with the first protrusion plate 11. Then, the stopper 23 of the guide pin 20 is
When abutting against the step 22 of the protruding plate 12, the second protruding plate 22 moves forward together with the first protruding plate 11. In this way, a delay moving means for delaying the ejection of the ejector sleeve 1 and following the ejector pin 2 is constituted.

In this embodiment, a hydraulic cylinder 25 is provided on the back surface of the second projecting plate 12 as means for ejecting and driving the ejector pin 2.
The mounting plate 10 is formed with a hole or a recess 10a that is accommodated so that the hydraulic cylinder 25 does not interfere. A rod connector 27 inserted into a guide hole 26 formed in the second protrusion plate 12 is connected to a piston rod 25 a of the hydraulic cylinder 25, and the base end of the ejector pin 2 is connected to the rod connector 27 by a screw 28. Installed. The stroke of the hydraulic cylinder 25 is set to be slightly longer than the distance L between the stopper 23 and the step 22 shown in FIG. When the piston rod 25a of the hydraulic cylinder 25 protrudes forward, the rod connector 27 moves forward in the guide hole 26, and the tip of the ejector pin 2 attached to the rod connector 27 is further larger than the tip of the ejector sleeve 1. Can stick out.

In the present invention, since the ejector pins 2 are not ejected at the initial stage of ejecting the ejector sleeve 1 by providing the delay moving means, the molded product S
After the mold is released from the surface of the mold M, the ejector pin 2 can be further pushed out to drop the molded product S. Further, the hydraulic cylinder 25 for ejecting and driving the ejector pin 2 is provided on the first ejection plate 11. Since it is provided on the second protruding plate 12 that moves forward following the ejector pin 1, the ejector pins 2
, The stroke of the hydraulic cylinder 25 as a means for projecting can be extremely short.

The molded product ejecting apparatus of the present invention is not limited to the above-described embodiment, but may be provided on a fixed mold. Further, in order to drive the ejector pin 2 to protrude, instead of the hydraulic cylinder 25, other means such as a cylinder driven by another fluid pressure such as air pressure, a rack and a pinion, or a ball screw may be employed. it can. Further, in the above-described embodiment, the ejector pin (molded article dropping member) 2 is concentrically fitted and arranged in the ejector sleeve (release member) 1, but the present invention is not limited to this. Without this, the release member 1 can be formed into a pin shape and the molded article dropping member 2 can be formed into a hollow sleeve shape, and the two can be arranged at different positions without being concentrically fitted and inserted. You can also. Furthermore, although not shown, the ejecting device 1 according to the present invention has an ejector sleeve 1.
After the molded product S is released from the mold by ejecting the ejector pins 2 and dropped, the ejector sleeve 1
In order to return the ejector pin 2 to the original position (the state shown in FIG. 1), for example, a return pin for pushing back the first protrusion plate 11 is provided, or the ejector sleeve 1 and the ejector pin 2 are returned to the original position. A biasing means such as a biasing spring may be provided.

Next, the molded article ejecting method of the present invention will be described by using a molded article ejecting apparatus configured as described above. The method for projecting a molded product according to the present invention includes:
In general, by ejecting the ejector sleeve 1, the molded product S is released from the surface of the mold M, and the ejector pin 2 is moved to follow the ejection of the ejector sleeve 1 later than the ejection of the ejector sleeve 1. Further, the tip of the ejector pin 2 is projected.

When the molded product S is taken out of the mold M, as shown in FIG. 1, the molded product S adheres and remains on the surface of the movable mold M on which the molded product ejection device of the present invention is provided. Then, the entire movable side of the mold M or the like provided with the molded product ejection device is moved away from the fixed mold to open the mold. At this time, the knockout rod 19 has not yet protruded forward, and the tips of the ejector sleeve 1 and the ejector pin 2 form the same surface so as to be continuous with the surface of the mold M.

Next, as shown in FIG. 2, when the knockout rod 19 is pushed forward, the first ejection plate 11 is moved forward via the ejector auxiliary rod 16, and the first ejection plate 11 is moved forward.
The ejector sleeve 1 attached so as to extend in front of the ejection plate 1 is ejected to release the molded product S from the surface of the mold M. At this time, the second protruding plate 12 does not move forward until the step 22 is brought into contact with the stopper 23 of the guide pin 20. Therefore, the ejector pins 2 supported by the second projecting plate 12 are not projected, and only the ejector sleeve 1 is projected first. When the tip of the ejector sleeve 1 protrudes the molded product S, the molded product S adheres by causing so-called biting due to release resistance from the surface of the mold M and so-called hugging due to shrinkage of the molded product S, There is a possibility that it will not easily fall on a shooter (not shown).

Thereafter, as shown in FIG. 3, when the knockout rod 19 is further protruded forward and the stopper 23 of the guide pin 20 is abutted against the step 22 of the second protruding plate 12, the end of the ejector sleeve 1 is In a state where the tip of the ejector pin 2 is retracted by the distance L, that is, in a state where the tip of the ejector pin 2 is not in contact with the molded product S, the second ejection plate 12 moves forward following the first ejection plate 11. Become.

Subsequently, as shown in FIG. 4, when the piston rod 25a of the hydraulic cylinder 25 is driven to extend, the rod connector 27 is moved forward in the guide hole 26, and the ejector pin 2 attached to the rod connector 27 protrudes. Will be done. The ejection of the ejector pin 2 is performed such that the tip of the ejector pin 2 projects beyond the tip of the ejector sleeve 1.
Is driven to extend slightly longer than the distance L. Molded product S
Causes the so-called biting or hugging to adhere to the tip of the ejector sleeve 1,
By protruding the ejector pins 2 from the ejector sleeve 1, the molded product S is separated from the ejector sleeve 1 and falls reliably and quickly onto a shooter or the like (not shown).

[0024]

According to the first aspect of the present invention, the release member is provided so as to be able to protrude so as to release the molded product from the surface of the mold, and the tip projects further than the protruded tip of the release member. With a simple structure including a molded article dropping member provided so as to be able to move the molded article falling member to follow the release of the release member with delay, the molded article is reliably ejected and dropped. It is possible to provide a molded product ejecting device capable of performing the above-mentioned.

According to the second aspect of the present invention, the molded article is released from the mold surface by projecting the release member, and thereafter, the tip of the molded article dropping member is projected more than the tip of the release member. With such a configuration, it is possible to provide a molded product ejecting method capable of reliably ejecting and dropping the molded article.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of a molded article ejecting apparatus according to the present invention, showing a state in which a molded article remains and adheres to an opened mold surface before the molded article is ejected. I have.

FIG. 2 is an explanatory view showing a state in which an ejector sleeve is protruded from the state of FIG. 1 and a molded product is released from a mold surface.

FIG. 3 shows a state in which the ejector sleeve further projects from the state of FIG. 2 so that the stopper of the guide pin abuts against the step of the second ejector plate, and the ejector pin moves backward and follows the ejector sleeve. It is explanatory drawing which shows a state.

FIG. 4 is an explanatory view showing a state in which the tip of the ejector pin is further protruded from the tip of the ejector sleeve from the state of FIG. 3;

[Description of sign]

 Reference Signs List 1 ejector sleeve (release member) 2 ejector pin (molded product drop member) 19 knockout rod 22 step 23 stopper 25 hydraulic cylinder

Claims (2)

[Claims] 1. A release member provided to be able to protrude to release a molded product from a mold surface, and a molded product falling member provided to be able to protrude further from the protruded tip of the release member. And a delay moving means for causing the molded article dropping member to follow the molded article falling member with a delay with respect to the ejection of the release member. 2. A method for ejecting a molded product, comprising: releasing a molded product from a mold surface by projecting a release member; and thereafter protruding a tip of the molded product falling member further than a tip of the release member. .