JPH042417B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an injection molding machine, and more particularly to an automatic take-out device for automatically taking out a molded article molded by an injection molding machine.

(Prior Art) Generally, when a molded product molded by an injection molding machine is taken out from a mold, an automatic take-out device is used.

Here, with reference to FIGS. 4a to 4f, a description will be given of how to take out a molded product using a conventional automatic take-out device.

The automatic take-out device (not shown) is equipped with a chuck plate 11, which is in a predetermined standby position during injection molding. Fixed mold 2 and movable platen 3 attached to fixed platen 1
Molten resin is injected into the cavity formed by the movable mold 4 attached to the mold and molded into a predetermined shape (FIG. 4a). When the predetermined molding process is completed, the movable platen 3, that is, the movable mold 4
moves to the left (Figure 4b). When the mold opening is completed, the chuck plate 11 moves downward as shown by the solid arrow (FIG. 4c) and stops at a position facing the molded product 12 (ejecting device). The chuck plate 11 then holds the molded product 12 under vacuum (or mechanically) (FIG. 4d). The chuck plate 11 holding the molded product 12 is moved upward as shown by the broken line arrow, and the molded product 12 is taken out (FIG. 4e).
After that, the mold is clamped again and molten resin is injected into the cavity.

(Problems to be Solved by the Invention) As described above, in the case of the conventional automatic take-out device, the molded product take-out operation is started after the mold opening is completed, and after the automatic take-out device has finished taking out the molded product. , the mold is tightened again using sequence control.

Therefore, there are problems in that it takes a long time to take out the molded product and the molding cycle becomes substantially longer.

Furthermore, since the conventional automatic take-out device was a mechanical take-out machine using sequence control,
A take-out device must be designed for each injection molding machine.

(Means for solving the problems) The automatic extraction device for injection molded products according to the present invention has the following features:
It has a detection means for continuously detecting the start of movement and the amount of movement of the movable mold, a take-out mechanism including a grip part for taking out the molded product molded in the cavity, and a control means for numerically controlling the take-out mechanism, When the detection means detects the movement of the movable mold in the mold opening direction, the control means numerically controls the take-out mechanism according to the amount of movement of the movable mold, and the grip part is moved from a predetermined standby position until the mold opening is completed. At this point, the gripping part is moved to a take-out position where the molded product can be taken out, and the molded product is held by the gripping part. On the other hand, when the movable mold moves in the mold clamping direction, the control means is activated by the detection means. A feature of the present invention is that the ejection mechanism is numerically controlled in accordance with the amount of movement of the movable mold detected when the movable mold is moved, so that the gripping part is retracted from the ejection position.

(Example) The present invention will be explained below with reference to Examples.

First, an injection molding machine equipped with an automatic take-out device according to the present invention will be described with reference to FIG.

A fixed mold 2 is fixed on one surface of a fixed plan 1, and a movable mold 4 is fixed on one surface of a movable platen 3. The movable platen 3 has a diver 5 attached at one end to the fixed platen 1 as shown in the figure.
The fixed mold 2 and the movable mold 4 form an injection molding cavity. This cavity is then filled with molten resin from an injection device (not shown).

The automatic take-out device includes a movable platen 3, that is, a detector (stroke detector) 6 for detecting movement of the movable mold 4, a molded product take-out machine 7, and a controller 8.

The stroke detector 6 is composed of an encoder 61 and a magnetic scale 62, and the encoder 61 is attached to the fixed platen 1.
On the other hand, the magnetic scale 62 is attached to the movable platen 3, and the magnetic scale 62 is attached to the movable platen 3 as shown in the figure.
is the encoder 6 as the movable platen 3 moves.
Move relative to 1. Therefore, the amount of movement of the movable platen 3, that is, the movable mold 4 is determined by the encoder 61.
Continuously detected by

The molded product take-out machine 7 is attached to a base 71 and includes a support portion 72 extending in the X-axis direction in the figure. Further, an arm portion 73 extending in a direction perpendicular to the support portion 72 (Y-axis direction) is attached to the support portion 72 . The arm portion 73 includes a take-out arm 74, and a chuck plate 75 is attached to the tip of the take-out arm 74.

A pneumatic device and a servo motor (both not shown) are incorporated in the base 71, while servo motors 76 and 77 are attached to the support portion 72 and the arm portion 73, respectively. The arm portion 73 is moved in the X-axis direction by driving the servo motor 76, and the take-out arm 74 is moved in the Y-axis direction by driving the servo motor 77. On the other hand, the arm portion 73 rotates relative to the support portion 72 by driving a servo motor within the base 71 .

The above-mentioned stroke detector 6 is connected to the controller 8, and the molded product removal machine 7 is connected to the controller 8.
controlled by. The controller 8 includes a floppy disk drive device 91, a CRT 92,
An input/output device 9 including a keyboard 93 and a keyboard 93 are connected, and the controller 8 controls the molded product ejecting machine based on the process set on the floppy disk inserted into the floppy disk drive device 91.

Next, referring also to FIGS. 2a to 2d, the operation of taking out a molded product by the above-mentioned automatic taking out device will be described.

The fixed mold 2 and the movable mold 4 are clamped,
Molten resin is injected into the cavity from the injection device. After a predetermined injection process and a pressure holding process, mold opening is started.

When the movable platen 3 starts moving, a pulse signal is input from the encoder 61 to the controller 8. Based on this pulse signal, the controller 8 learns the movement of the movable platen 3, that is, the movable mold 4 in the mold opening direction, and starts driving the take-out machine 7 (FIG. 2a).

The controller 8 drives and controls three servo motors 76 and 77 (one not shown) by numerical control to move the arm portion 73 to a predetermined height (height corresponding to the cavity). Take-out arm 7
4, gradually rotate the arm portion 73 clockwise. That is, the mold opening speed of the movable mold 4 (i.e.,
The controller 8 moves the chuck plate 75 closer to the movable mold 4 at a set speed in accordance with the mold opening speed. When the mold opening is completed, the chuck plate 75 has moved to a position facing the molded product 10 in the movable mold 4. That is, when the mold opening is completed, the controller 8 numerically controls the take-out machine so that the chuck plate 75 moves to the molded product take-out position (FIG. 2b).

When the mold opening is completed, the molded product is ejected by the ejector device (not shown) of the injection molding machine, and the pneumatic equipment of the ejection machine is driven so that the chuck plate 75 holds the molded product 10 under vacuum. , that is, check. (Figure 2c).

When the molded product is checked, the take-out machine 7
sends a chuck completion signal to the controller 8. Upon receiving the chuck completion signal, the controller 8 moves the movable platen 3, that is, the movable mold 4 in the mold clamping direction using a mold drive device (not shown).
Start mold clamping. On the other hand, the take-out machine 7 moves the take-out arm 74 backward according to the moving speed of the movable mold 4 (the amount of movement in the mold clamping direction) under numerical control of the controller 8, and gradually rotates the arm part 73 counterclockwise. , take out the molded product. Then, the mold clamping is completed when the molded product is taken out (Fig. 2d), and the next injection process is started.

In the case of the above-mentioned automatic take-out device, as shown in Figure 3, the take-out machine is driven in accordance with the mold opening speed when the mold opens, and the molded product is held as soon as the mold opening is completed. Upon completion, mold clamping is immediately started and the take-out machine is driven at the mold clamping speed to take out the molded product, so the time to take out the molded product and the injection molding cycle can be shortened compared to the conventional method.

In addition, when a plurality of injection molding machines are controlled by a central computer, the above-mentioned controller is installed within the central computer or has a communication function with the central computer. Further, in order to accurately detect the movement of the movable mold, a plurality of stroke detectors may be provided.

(Effects of the Invention) As explained above, in the automatic take-out device according to the present invention, in response to the mold opening/closing operation of the injection molding machine,
That is, since the molded product is removed in conjunction with the opening and closing operations of the mold, the molding time including the time for removing the molded product can be shortened. Furthermore, since the molded product is taken out by numerical control, it can be used with any injection molding machine. Therefore, when a plurality of injection molding machines are centrally managed, it becomes easy to handle mold replacement.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of an injection molding machine using an automatic take-out device according to the present invention, and FIG.
d is a diagram for explaining the operation of the automatic take-out device according to the present invention, FIG. 4A to 4F are diagrams for explaining the operation of a conventional automatic take-out device. 1...Fixed platen, 2...Fixed mold, 3...
Movable platen, 4... Movable mold, 5... Diver, 6... Stroke detector, 7... Molded product removal machine, 8... Controller, 9... Input/output device.

Claims (1)

[Claims] 1 Used in an injection molding machine comprising a fixed mold and a movable mold that is provided to be movable forward and backward with respect to the fixed mold and forms an injection molding cavity together with the fixed mold, and when the movable mold starts moving. and a detection means for continuously detecting the amount of movement, a take-out mechanism including a grip for taking out the molded product molded in the cavity, and a control means for numerically controlling the take-out mechanism, When detecting the movement of the movable mold in the mold opening direction, the control means numerically controls the take-out mechanism according to the amount of movement of the movable mold to move the gripping part from a predetermined standby position to the mold opening direction. When the molded product is removed, the gripping portion is moved to a take-out position where the molded product can be taken out, and the molded product is held by the gripping portion;
On the other hand, when the movable mold moves in the mold clamping direction,
The control means numerically controls the take-out mechanism according to the amount of movement of the movable mold detected by the detection means, and retracts the gripping part from the take-out position. Automatic take-out device for injection molded products.