JPS6232821Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a molded product ejecting device for an injection molding machine, and particularly to a molded product ejecting device incorporating a gate cutter for cutting off unnecessary molded products.

Conventionally, in injection molding of synthetic resins, when taking out the molded product after molding, the unnecessary molded parts consisting of the sprue part and runner part, which are molded together with the molded part during the molding operation, are grasped with a mechanical clamp, and the molded parts are held with a mechanical clamp. It was common for the molded product to be removed from the engraving space of the mold, transported to the jute, and recovered.

In order to separate unnecessary molded products from molded products, manual work was often required, but this work had the disadvantage of being inefficient.

Therefore, it has often been done to separate the molded product from the waste molded material gripped by the clamp arm by installing a gate cutting device for the waste molded material at the exit position of the clamp. Since the method is fixed and the position where the gate is cut and the molded products are collected is limited to a certain position, there is a drawback that it is difficult to sort and collect molded products according to the type of molded products.

The purpose of this invention is to solve the above-mentioned drawbacks by incorporating a gate cutter into the clamp head, in view of the problems such as sorting and collecting molded products due to the structural limitations of the molded product take-out device based on the above-mentioned conventional technology. It is an object of the present invention to provide an excellent molded product retrieval device that is advantageous for efficient gate cutting and sorting and recovery of molded products.

The structure of this invention in accordance with the above object is such that a movable core holding an insert of a molded product protrudes upward from the mold with respect to the clamp head at the tip of the clamp arm advanced into the mold, and is mounted on the clamp head. After gripping the insert with the clamp claw, the clamp arm is moved back, and at an appropriate exit position, the unnecessary molded product is cut and separated from the molded product using a gate cutter built into the clamp head. It is something to do.

Next, an embodiment of this invention will be described below based on the drawings.

In the figure, a mold engraving space 2 is formed in a lower mold 1, and a movable core 3 is incorporated in the vicinity thereof so as to be freely retractable. An insert 4 is inserted and held in the movable core 3, and when the movable core 3 descends into the mold 1, the insert 4 faces the molding space 2, and a molded product 5 is formed. When molding the molded product 5, the first
As shown in the figure and FIG.
is connected to.

On the other hand, as shown in FIG. 2, when the upper and lower molds 1 (not shown) are opened, the clamp device 10 advances into the molds. The clamp arm 11 of the clamp device 10 is supported by appropriate means (not shown) so as to be able to move forward and backward, and is provided with a clamp head 12 at its tip.

As shown in FIG.
Inside, an inverted L-shaped clamp claw 13 is rotatably supported by a shaft 14. The clamp claw 1
The rear end 13b of the clamp head 3 is biased counterclockwise by a spring 15 embedded within the clamp head 12. On the other hand, a clamp air cylinder 16 is mounted on the clamp head 12, and the lower end of its operating rod 17 is connected to the rear end of the clamp claw 13.
3b.

A shoulder portion 18 is formed at the lower end of the clamp head 12, and a shoulder portion 18 is formed at the lower end of the clamp head 12.
The insert 4 is pressed and clamped between. A gate cutter 20 is provided near the shoulder portion 18.
is built in so that it can freely appear and retract, and is connected to and driven by the gate cutter cylinder 21.

In the above configuration, after the molded product 5 is molded into the insert 4 in the injection process, when the upper and lower molds 1 (not shown) are opened, the clamp arm 11 of the clamp device 10 is placed in the surface of the mold 1. It is moved forward (from right to left in FIG. 2, that is, vertically upward in FIG. 1) and stops at a predetermined position. At this time, the operating rod 1 of the clamp air cylinder 16
7 is pulled upward as shown by the chain line in FIG.
, the tip 13a is moved away from the shoulder 18 of the clamp head 12.

Next, the movable core 3 is raised, and the molded product 5 is removed from the molding space 2 of the lower mold 1. Then, the movable core 3 holds the insert 4 and rises together with the molded product 5 and the unnecessary molded product 6, and when the insert 4 comes into contact with the shoulder 18 of the clamp head 12, Stop.

After that, the clamp air cylinder 16 is driven, and its operating rod 17 is lowered to lower the clamp claw 13.
is rotated to the solid line position by overcoming the spring 15. As a result, the insert 4 is pressed and clamped between the front end 13a of the clamp claw 13 and the shoulder 18 of the clamp head 12, and the molded product 5 and the unnecessary molded product 6 are clamped.
be fixed integrally with this.

Then, when the clamp arm 11 is retreated from the surface of the mold 1 (from the left to the right in FIG. 2, that is, vertically downward in FIG. 1), the insert 4
is pulled out and separated from the movable core 3. After the clamp arm 11 is moved back to a predetermined position where the recovery chute is located, the gate cutter cylinder 21 is driven to lower the gate cutter 20. The gate cutter 20 cuts the gate portion 9 of the unnecessary molded product 6 to separate the unnecessary molded product 6 from the molded product 5.

The molded product 5 from which the unnecessary molded product 6 has been separated
, either leave the clamp arm 11 in the same position, or move the clamp arm 11 further and move the clamp claw 1 to another position.
It is recovered by releasing 3. The clamp claw 13 is released by the clamp air cylinder 16.
This is done by pulling up the operating rod 17 and rotating the pawl 13 counterclockwise by the spring 15.

As mentioned above, according to this invention, a movable core for inserting and holding an insert into a mold is built in so that it can come out and go, and a clamp claw is attached to the clamp head of a clamp arm that can move forward and backward into the opened mold. By incorporating a retractable gate cutter in the vicinity of the gate cutter, the gate cutter can automatically cut off unnecessary molded products from the molded product that is gripped by the clamp claw and transferred to the outside of the mold. Manual work is no longer required, improving work efficiency, and the cutting and separation position of unnecessary moldings can be freely selected.
When collecting molded products from which unnecessary molded parts have been separated, the collection position can be changed very easily by adjusting the retraction position of the clamp arm, and the collection can be sorted and collected according to the type of molded product. It has an excellent effect that can be easily achieved.

Furthermore, the molded product is removed from the die-carving space by holding the insert by the movable core and lifting it up, and the molded product is not directly ejected, so there is no possibility of damaging the molded product. . Moreover, since the molded product is held by the clamp by gripping the insert, and the unwanted molded product is separated from the molded product by cutting off the unwanted molded product, there is no risk of damaging the molded product. It does not spoil the incidental effect of being free.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, in which Fig. 1 is a partial cross-sectional view, and Fig. 2 is a partial cross-sectional view taken along A-A of Fig. 1.
The cut side view and FIG. 3 are perspective views of the molded product and the unnecessary molded product. 1... Mold, 3... Movable core, 4... Insert, 5... Molded product, 6... Unused molded product, 9...
Gate part, 10... Clamp device, 11... Clamp arm, 12... Clamp head, 13...
Clamp claw, 16...clamp air cylinder,
20...Gate cutter, 21...Gate cutter cylinder.

Claims (1)

[Utility Model Claims] The movable core 3 is incorporated in the mold 1 so as to be able to rise and fall freely, and when it descends before injection, it holds and descends the insert 4, bringing the insert into the engraving space 2 of the mold 1, and when it rises after injection, it raises the molded product 5 and the waste molding 6 together to remove them from the engraving space 2 of the mold 1, and the clamp head 12 advances into the mold 1 surface after the mold is opened and retreats from the surface, and the clamp head 12 holds and descends the insert 4, which is held by the movable core 3 and rises when the movable core 3 rises.
A shoulder 18 is provided at the lower end of the head 12 against which the insert 4 can come into contact, and clamping claws 13 are provided for pressing and clamping the insert 4 that comes into contact with the shoulder 18 from below after the head 12 advances into the surface of the mold 1, and furthermore, after the head 12 retreats from within the surface of the mold 1,
The injection molding machine is provided with a molded product removal device, characterized in that it has an internal cutter (20) that descends toward a gate portion (9) in a waste molding (6) protruding from a molding (5) integrally fixed to an insert (4) pressed and clamped against the shoulder portion (18).