JPH0124054B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an automatic ejecting and finishing device for injection molded products, more specifically, an automatic ejecting and finishing device for injection molded products, specifically, an apparatus for automatically ejecting molded products molded by an injection molding machine from a mold, and also for performing subsequent annealing treatment and product separation. The present invention relates to a new and improved automatic take-out and automatic finishing device for injection molded products, which is capable of automatically performing a series of finishing operations.

Generally, in order to finish a molded product molded using an injection molding machine that has a mold structure capable of molding multiple pieces into a final product, after the injection molding is completed, the molded product is removed from the mold and placed in, for example, a water tank. This is done by immersing the molded product for a predetermined period of time to perform an annealing treatment, and then using a cutter to cut a plurality of gate portions connecting the molded product and the runner. Conventionally, in order to smoothly carry out this series of work steps, the first step was to let the molded product fall freely onto a guide rail using a protruding pin provided in the mold and introduce it into the water tank. In the second process, the molded product is placed in a water tank and transported through the tank over a predetermined period of time using a conveyor, for example, and in the further process, the molded product is once removed from the water tank. After
The method used was to charge this into a cutter device installed separately.

However, because the series of work steps in ~ above have traditionally been carried out using the method described above, when moving on to the work process in ~, it is necessary to rely on human labor, which requires a large amount of time and effort. This process requires labor, and since the working time required for this is not constant, it has the disadvantage that the annealing treatment time varies from molded product to molded product. There is a disadvantage that relatively soft molded products taken out from the molds, which have not yet been annealed, are often scratched or dented, and the incidence of defective products is therefore extremely high.

The present invention relates to a new and improved automatic take-out and automatic finishing device for injection molded products that can solve the disadvantages and shortcomings of the conventional methods, and is characterized by: (1) access to the mold of an injection molding machine; , and a loading arm that grips the injection molded product carried by a mechanism that separates from it; (b) A loading arm that is equipped with a mechanism that grips the runner part of the injection molded product at its tip, and that has at least one end that is rotated or held on an endless track. one molded product gripping tool, c) an annealing mechanism and a gate cutting mechanism arranged at intervals on the movement locus of the runner gripping position of the gripping tool, and d) molding after the molding cycle of the injection molding machine is completed. When opening the mold, the loading arm is brought close to the mold and its tip grips the injection molded product, then the loading arm is moved away from the mold and moved to its retracted position, and then the gripping tool is moved to grip the runner part of the molded product with its tip, and then the gripping tool is intermittently rotated to an annealing position and a gate part cutting position,
It is characterized by comprising a process control circuit for subsequently opening the runner gripping mechanism.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on drawings illustrating the present invention.

First, FIG. 1 shows a schematic configuration of the apparatus of the present invention, which basically includes a loading arm 2 that can automatically take out an injection molded product 1 from a mold, and a loading arm 2 that can automatically take out an injection molded product 1 from a mold. The main parts include a molded product gripping tool 3 for finishing the product, an annealing mechanism 4 for the molded product, a gate cutting mechanism 5, and a process control circuit 6. Note that 7 in the figure is an injection molding machine.

The loading arm 2 in the present invention is supported by a mechanism that moves reciprocatingly on a guide rail 22 by an actuator 21 to approach and move away from a mold 71 of an injection molding machine 7. A mechanism for gripping the injection molded product 1, such as an air suction type suction cup, is attached to its tip.

The movement of the loading arm 2 is controlled by the process control circuit 6 to have a certain rest time. In other words, during the molding operation after injection molding 7, the loading arm 2 stops its movement and moves to the rear end position, that is, as shown in the figure.
A', but when the mold is opened after the molding cycle is completed, it starts moving and approaches the mold 71, and on the other hand, after the molded product is released by its gripping mechanism, it moves away from the mold 71. Then, it returns to the rear end position A', completing one cycle.

The mold 71 of the injection molding machine 7 used in the apparatus of the present invention preferably has a structure capable of molding multiple molds, and its mold clamping mechanism is opened at the same time as molding is completed.

Next, the molded product gripper 3 in the apparatus of the present invention is
For example, a mechanism 32 is provided at the tip of a shaft 31 to grip the runner portion of the molded product sent by the loading arm 2, and the end of the shaft 31 is held on a rotating shaft 33. The molded product gripping mechanism 32 is configured to rotate around a rotating shaft 33.

Furthermore, regarding the molded product annealing mechanism 4 and gate section cutting mechanism 5, these are arranged at intervals on the movement locus of the runner gripping mechanism 32 of the gripping tool 3, and for example, this annealing mechanism The mechanism 4 is equipped with a water tank 41, and the gate cutting mechanism 5 is equipped with an electric cutter device 51.

Therefore, the gripping tool 3 is also controlled by the process control circuit 6 to control its rotation and the runner gripping mechanism 3.
1 is controlled, in other words, this gripping tool 3 is normally located at the rear end position of the loading arm 2.
The molded product 1 is placed at a position A opposite to A′, and the molded product 1 is moved to the rear end position by the gripping means of the loading arm 2.
When the molded product is sent to A', the runner gripping mechanism 31 operates to grip the runner portion of the molded product. At this time, the molded product gripping mechanism of the loading arm 2 is turned off at almost the same time, and the molded product is moved from point A' to point A.
It is now being forwarded to. Then grip tool 3
rotates intermittently to the annealing mechanism 4 (B in the figure) and the gate cutting mechanism 5 (c in the figure) while gripping the runner part of the molded product, and then releases the runner gripping mechanism 31 (D in the figure). ) and return to point A, completing one cycle.

In addition, in B in the figure and C in the figure, the rotation of the gripping tool 3 is temporarily stopped for the time required for annealing the molded product and the time required for cutting the gate part, and When cutting the gate portion, for example, as shown in FIG. The structure is such that the gate members 1b, 1b are cut by a cutter blade 52, compared to the conventional method in which a worker fixedly placed the molded product between the base plate and the upper plate and cut it. In fact, there is no deflection of the molded product during cutting, and the placement position of the molded product on the base plate is kept constant by the runner gripping mechanism 32, so the molded product does not shift relative to the cutter blade and is always stable. It is capable of cutting.

FIG. 3 shows the time schedule (1 to 2 cycles) for finishing an injection molded product as a final product using the device of the present invention.As is clear from the drawing, in the device of the present invention, the gripping tool 3 The time required for one cycle of the injection molding machine (from the start of press-fitting the molding material into the mold to the time of opening the mold after molding completion) is the time required for one cycle of the loading arm 2. According to this, molded products can be transferred without time loss in a series of work processes such as the molding process, molded product removal process, and molded product finishing process. This allows for smoother operation of the device.

On the other hand, although the drawings illustrate a case in which the molded product finishing process is carried out by rotating one gripper 3, the present invention is not limited to this, and this can be done, for example, as shown in FIG. Alternatively, a plurality of gripping tools 3 may be held on a rotating shaft 33 and rotated intermittently, or an endless track 36 that is driven by a driving shaft 34 and a driven shaft 35 as shown in FIG. The structure may be such that a plurality of grippers 3 are held at the same time, and in the case of a structure in which a plurality of grippers 3 are provided in this way, the molding process using an injection molding machine can be completed in a relatively short time. When molding products such as toothbrushes, the advantage is that the subsequent finishing steps can be carried out very efficiently and quickly.

As explained above, according to the device of the present invention, it is possible to reliably and quickly perform the task of removing molded products from molds, which was considered to be one of the causes of defective products in the past, and the finishing work of molded products, which required a great deal of time and effort. Therefore, its practical value is great.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a schematic configuration of an automatic take-out and automatic finishing device for injection molded products according to the present invention, and FIG. 2 is an enlarged sectional view with a portion cut away of a cutter device used in the device of the present invention. be. FIG. 3 is a diagram showing the operating time schedule of the device of the present invention. FIGS. 4 and 5 are schematic plan views showing other embodiments of the gripping tool of the present invention. DESCRIPTION OF SYMBOLS 1... Injection molded product, 1a... Product part, 1b... Gate part, 2... Loading arm, 21... Operating part, 22... Guide rail, 3... Gripping tool, 31... Shaft,
32... Runner gripping mechanism, 33... Rotating shaft, 34... Drive shaft, 35... Driven shaft, 36... Endless track, 4... Annealing mechanism, 41... Water tank, 5... Gate section cutting mechanism, 51... Cutter device, 52... Cutter blade, 6
...Process control circuit, 7...Injection molding machine, 71...Mold, 81...Base plate, 82...Upper plate.

Claims (1)

[Scope of Claims] 1. A loading arm that approaches the mold of an injection molding machine and grips the injection molded product supported by a mechanism that moves away from the mold, and 2. A loading arm that grips the runner portion of the injection molded product at its tip. At least one molded product gripping tool having a mechanism for holding the runner at its end and held on a rotating shaft or an endless track; a cutting mechanism, (d) when the mold is opened after the molding cycle of the injection molding machine is completed, the loading arm approaches the mold, grips the injection molded product with its tip, and then removes the loading arm from the mold; The gripping tool is then moved to grip the runner part of the molded product with its tip, and then the gripping tool is intermittently rotated to an annealing position and a gate cutting position. and a process control circuit for releasing the runner gripping mechanism.