JPH05177676A - Injection molding machine fitted with molded product taking-out device - Google Patents

Abstract

PURPOSE:To prevent the generation of any damage in a mold or a molded product taking-out device by mechanically preventing the advance of a movable plate by the taking-out arm positioned between the leading end surfaces of a pair of the opposed members provided to both of the movable plate and a fixed plate. CONSTITUTION:A taking-out arm 16 is rapidly revolved during the delay time before a movable plate 6 actually begins to move even when a mold closing start command signal is outputted and a disc reaches a standby position W from a molded product taking-out revolving start position to be taken out to a molded product release position R at a stroke without receiving any interference. If the advance operation of the movable plate 6 is started when the disc is present within the movable plate 6, the obstruction part 18A of the obstruction arm 18 of the taking-out arm 16 obstructs the thrust of a thrust bar 11 into a receiving member 14 to mechanically prevent the advance of the movable plate 6. By this constitution, the damage of an expensive mold or an expensive molded product taking-out device is perfectly prevented even when a molded product is taken out and a molding cycle can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine having a molded product take-out device.

[0002]

2. Description of the Related Art When a molded product is taken out from an injection molding machine by a molded product take-out device, if a molded product held by a take-out arm is in a forward movement region of a movable platen (hereinafter referred to as a movable platen), mold closing is started. Since the molded product and the take-out arm may come into contact with the mold and the movable plate and damage them, the mold closing start command signal is used as the confirmation signal that the molded product has come out of the movable plate. However, when the mold closing start command signal is issued, the movable plate does not immediately start to move forward, but the operation delay of the switching valve for sending the hydraulic oil to the mold closing cylinder, the compressibility of the hydraulic oil and the friction resistance of the sliding part. As a result, there was actually a delay time in the range of about 0.2 to 0.5 seconds.

[0003]

SUMMARY OF THE INVENTION According to the present invention, it is possible to shorten the molding cycle by effectively utilizing the delay time during the molding product unloading time without causing damage to the mold, the molding product unloading device and the like. An object of the present invention is to obtain an injection molding machine with a simple molded product take-out device.

[0004]

[MEANS FOR SOLVING THE PROBLEMS] A fixed mold is attached to a fixed plate, and a movable mold is attached to a movable plate capable of mold closing and mold opening with respect to the fixed plate. A pair of opposing members having a predetermined distance between their respective tip surfaces and capable of moving in and out without causing interference with the other over the entire stroke when the mold is closed and forward is formed as a pair from both the movable platen and the fixed platen. A molded product take-out device having a take-out arm that can turn between a molded product take-out turning start position for holding and taking out a molded product of the movable mold or the fixed mold and a molded product release position is provided. Further, the take-out arm is positioned between the front end faces of the pair of opposing members when the molded product held by the take-out arm is inside the movable platen, whereby the movable platen is moved forward based on the mold closing start command signal. Mechanically To form a shape, and with the molded article can command a mold closing start signal taking the turning simultaneously with the start or slight lag time of holding the take-out arm a dispensing apparatus with an injection molding machine.

[0005]

The mold closing start command signal is output at the same time as or slightly after the start command signal for taking out the molded product of the take-out arm, that is, when the molded product is in the movable plate, but the movable plate is actually moved forward. During the lapse of the delay time until starting, the take-out arm is turned to take out the molded product to the outside of the movable plate. Even if the actual forward movement of the movable platen starts while the molded product is inside the movable platen, the position between the front end faces of the opposing members provided as a pair from both the movable platen and the fixed platen. The take-out arm mechanically blocks the advancement of the movable plate, so that no damage is caused to the mold, the molded product take-out device, or the like.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An injection molding machine with a molded product take-out device for molding a disk will be described as one embodiment according to the present invention with reference to FIGS. 1 and 2.

[0007] 1 is an injection molding machine, 2 is an injection molding machine 1
Is the base of. 3 is a fixed plate mounted on the base 2,
Reference numeral 4 denotes a plurality of tie bars that are tensioned between the fixed platen 3 and the collar portion of the mold clamping cylinder (not shown). A movable plate 6 is fixed to the tip of the mold clamping ram 5 and is slidable along the plurality of tie bars 4. The movable plate 6 can be moved toward or away from the fixed plate 3 by the forward or backward movement of the mold clamping ram 5. Is becoming Reference numeral 7 is a fixed mold attached to the fixed platen 3, and 8 is a movable mold attached to the movable platen 6. The movable mold 8 is closed or opened. A heating cylinder 9 of the injection molding machine 1 has a screw (not shown) inserted in its inner hole so as to be rotatable and reciprocally movable, and clamps the fixed mold 7 and the movable mold 8 together. The raw material that has been plasticized and melted can be injected from the nozzle 10 into a cavity that is sometimes formed, that is, in a mold space for molding a disk in this embodiment.

Reference numeral 11 is a round bar-shaped projecting bar having a male screw formed on the rear portion thereof, and 12 is a bracket fixedly provided on the upper part of the movable platen 6. The projecting bar 11 directs its tip toward the stationary platen side. It is screwed. Reference numeral 13 is a lock nut for preventing loose engagement of the thrust bar 11 and the bracket 12. Reference numeral 14 is a receiving member that is a hollow cylinder whose main portion has an inner diameter larger than the outer diameter of the thrust bar 11, and is fixedly attached to the upper portion of the stationary platen 3 with its tip facing the thrust bar 11. Of course, the thrust bar 11 is provided on the side of the fixed plate 3 and the receiving member 14 is provided.
Can be provided on the movable plate 6 side. That is, plunge bar 1
1 and the receiving member 14 have a predetermined distance between their front end surfaces when the mold opening for taking out a molded product is stopped, and one of them interferes with the other over the entire stroke when the mold is closed and advanced. That is, a pair of opposing members that can be put in and out without any other elements are configured.

Reference numeral 15 denotes a molded product take-out device for taking out a disk as a molded product from the mold to the outside of the injection molding machine.
The molded product may be taken out from either the movable mold 8 or the fixed mold 7, but in the present embodiment, a case where the molded product is taken out from the movable mold 8 will be described as is particularly clear from FIG. The main part of the molded product take-out device 15 is a take-out arm 16
And a motor 17 for rotating the take-out arm 16. The motor 17 is fixedly attached to the upper part of the fixed platen 3. The take-out arm 16 is, here, a blocking arm 18, a forward / backward moving arm 19, a plurality of forward / backward moving cylinder devices 20, a plurality of suction pads 21, and a chuck device 2.
It consists of 2 mag.

One end of the blocking arm 18 is connected to the rotary shaft of the motor 17, and the other end of the blocking arm 18 serves as a mounting part for a plurality of forward / backward traveling cylinder devices 20 via the blocking part 18A. When the molded product is taken out of the movable platen when the molded product is taken out, the blocking portion 18A is located between the tip surfaces of the thrust bar 11 and the receiving member 14 as the pair of facing members described above, that is, the thrust bar 11 By blocking the entry into the receiving member 14, the movable plate 6 is formed into a shape that mechanically blocks the forward movement of the movable plate 6. In this embodiment, the gap between the surface of the blocking portion 18A on the stationary platen 3 side and the tip surface of the receiving member 14 is about 1 mm. The gap between the surface of the blocking portion 18A on the movable plate 6 side and the tip end surface of the thrust bar 11 is adjusted and locked according to the mold opening stop position during the mold replacement so that the gap is about 2 mm.

On the surface of the end of the blocking arm 18 on the side of the fixed plate,
A plurality of forward and backward cylinder devices 20 are attached. The tips of these piston rods are connected to the blocking arm 18
And is fixed to the forward / backward moving arm 19 on the movable plate side. That is, the forward / backward arm 19 can approach and separate from the blocking arm 18 based on the operation of the forward / backward cylinder device 20. The backward limit position of the piston rod of the forward / backward traveling cylinder device 20 can be electrically confirmed. At the same time that the retraction limit position of the piston rod of the forward / backward movement cylinder device 20 is electrically confirmed, it is assumed that the take-out arm 16 can start to turn, and the take-out arm 16 start-up command signal and the mold A closing start command signal is output from a control device (not shown). This mold closing start command signal can be output after a desired time delay by providing a timer (not shown).

The forward / backward movement arm 19 is provided with a plurality of suction pads 21 for holding the molded disk and a chuck device 22 for holding the separated sprue.

Next, the operation will be described. The resin that has been measured and melted in the heating cylinder 9 is injected through the nozzle 10 into the cavity formed by the fixed mold 7 and the movable mold 8 that have been clamped. When the molten resin in the cavity is solidified by cooling and the disk is molded, the mold opening operation is performed based on the retreat of the movable plate 6. At this time, the take-out arm 16 that has opened the disc of the previous cycle at the molded product release position R is already waiting at the standby position W slightly outside the movable plate.

As shown in the time chart of FIG. 3, at the same time when the mold opening is completed, the take-out arm 16 of the molded-article take-out device 15 turns so as to turn to just before the movable mold 8. As the piston rod of the forward / backward moving cylinder device 20 moves forward, the forward / backward moving arm 19 moves forward, the suction pad 21 is pressed against the disk of the movable mold 8, and vacuum suction is performed.
At the same time, the chuck device 22 chucks the sprue.
As the piston rod of the forward / backward moving cylinder device 20 moves backward, the forward / backward moving arm 19 holding the disk moves backward. At the same time when the retract limit position of the piston rod of the forward / backward traveling cylinder device 20 is electrically confirmed (at the time point (I) in the figure), it is assumed that the take-out arm 16 is ready to start turning, The molded product take-out and rotation start command signal and the mold closing start command signal are output from the control device. Even if the mold closing start command signal is output, the take-out arm 16 swivels quickly during the delay time until the movable platen 6 actually starts moving, so that the disk moves from the take-out swiveling start position of the molded product to the standby position. It reaches W and is taken out to the molded product release position R at once without interfering with anything. Should the disk move inside the movable platen and the forward movement of the movable platen 6 begins, the blocking arm 18 of the take-out arm 16
The blocking portion 18A blocks the entry of the plunging bar 11 into the receiving member 14, thereby mechanically blocking the forward movement of the movable plate 6. However, if such a condition occurs frequently, at the time of (II) after a short time has passed by the timer,
A mold closing start command signal may be output.

FIG. 4 shows a time chart of a conventional example. As is apparent from the figure, conventionally, it is confirmed that the disk has swung and retracted to the standby position W outside the movable plate (at the point (III) in the figure) and the mold closing start command signal is output.

After all, the difference (difference) between the time point (III) in the conventional example and the time point (I) in this embodiment is the shortened time in one cycle when the timer setting is not necessary.
When molding a compact disc as a disc according to the present invention, for example, the actual shortening time was about 0.2 seconds. Since one cycle time for compact disc molding is about 5 seconds, the time can be reduced by 4% per cycle, and if molding is performed at full day and night, it takes about 2 months per month.
It is possible to increase the production of 50,000 sheets.

The embodiment of the present invention has been described above. Other specific examples will not be described, but the present invention is not limited to an injection molding machine with a molded product take-out device for molding such a disc, and any molded product can be taken out without departing from the spirit of the invention. It goes without saying that it can be applied to an injection molding machine with a device.

[0018]

According to the present invention, when a molded product is taken out, damage to an expensive mold and a device for taking out the molded product can be completely prevented, and the molding cycle can be shortened.

[Brief description of drawings]

FIG. 1 is a main part diagram for explaining an embodiment of the present invention.

2 is a view taken along the line II-II in FIG.

FIG. 3 is a time chart diagram according to the present invention.

FIG. 4 is a time chart diagram of a conventional example.

[Explanation of symbols]

 1 injection molding machine 3 fixed plate 6 movable plate 7 fixed mold 8 movable mold 11 thrust bar (opposing member) 14 receiving member (opposing member) 15 molded product take-out device 16 take-out arm 17 motor 18A blocking section

Claims (3)

[Claims] 1. A fixed mold is attached to a fixed plate, and a movable mold is attached to a movable plate capable of mold closing and mold opening with respect to the fixed plate. Between the movable platen and the fixed platen, a pair of opposing members having a predetermined interval between them and capable of moving in and out without causing interference with the other over the entire stroke of the mold closing forward are provided. A molded product unloading swivel start position for holding and removing a molded product of a movable mold or a fixed mold,
A molded product take-out device having a take-out arm that can swivel to and from a molded product open position is provided, and when the taken-out arm holds the molded product in the movable plate, the pair of opposed members is provided. An injection molding machine with a molded product take-out device, wherein the injection molding machine has a shape that mechanically blocks the forward movement of the movable plate based on a mold closing start command signal by being positioned between the front end surfaces of the mold. 2. An electric confirmation device for confirming a state in which a take-out arm holding the molded product can start to rotate, and a confirmation signal from the electric confirmation device, and a start command for taking out a taken-out product of the taken-out arm. The injection molding machine with a molded product take-out device according to claim 1, further comprising a control device for simultaneously outputting a signal and the mold closing start command signal. 3. The injection molding machine with a molded product take-out device according to claim 2, further comprising a timer for outputting the mold closing start command signal after delaying a desired time from the molded product take-out rotation start command signal.