JP3472918B2 - Injection molding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when an ejector rod for removing a resin molded product from a mold is manually operated,
The present invention relates to an injection molding machine that can be satisfactorily operated.

[0002]

2. Description of the Related Art As a conventional injection molding machine, a movable table having a plurality of molds provided on one surface thereof is rotated or slid by a table drive device, so that the plurality of molds face the injection device. The molten resin is injected and injected into the mold, and the mold with the injected molten resin is sequentially carried to the position facing the ejector rod and the resin is molded from inside the mold by the ejector rod. It is known that a resin molded product is continuously manufactured by extruding a product, demolding the product, and repeating this process.

The injection molding machine is usually automatically operated by a control device, but the control device is manually operated when the mold position is adjusted and other parts are adjusted when the mold is replaced. By doing so, the rod drive device may be operated, and the ejector rod may be stopped in a state where it is not retracted to the retracted limit position. In this case, the control device controls the rod driving means that operates only while the operation button is being pressed so that the ejector rod can be stopped at any position.

Here, the ejector rod is arranged on the other surface side of the table, and its tip is inserted into the mold through a through hole provided in the table, so that the ejector rod is inserted through the ejector pin provided in the mold. The resin molded product in the mold is extruded and released from the mold. The ejector rod is driven so as to be inserted into and removed from the through hole of the table by a rod driving device whose operation is controlled by the control device. The control device operates the table drive device on condition that the ejector rod is pulled out from the through hole of the table so that the table and the ejector rod do not interfere with each other when the table is moved. Here, in this specification, the movement of the ejector rod in the direction of insertion into the through hole of the table is referred to as forward movement, and the movement in the direction of withdrawal is referred to as backward movement.

[0005]

However, in the conventional injection molding machine, when the rod drive device is operated by manually operating the control device, there are the following problems. When the ejector rod is stopped with its tip protruding from the mold mounting surface of the table, the ejector rod tip presses the ejector pin in the mold and causes it to protrude from the molding surface of the mold. The person can visually determine that the ejector rod has not retracted to the retracted limit position. However, if the ejector rod is stopped with its tip not protruding from the die mounting surface of the table, that is, with the tip of the ejector rod positioned in the through hole of the table, the ejector rod presses the ejector pin. Since the ejector pin is not projected from the molding surface of the mold, the operator cannot judge whether the ejector rod is retracted to the retracted limit position. If the table is to be moved in this state, the control device prohibits the operation of the table drive device that drives the table in order to prevent the interference between the table and the ejector rod. At this time, the operator does not notice that the ejector rod is not retracted to the retracted limit position that the table drive device does not operate, and there is a problem that it takes time and time is lost.

Further, in order to move the table after the adjustment, the operation button of the control device must be continuously pressed until the ejector rod is completely pulled out from the through hole of the table, and the operator operates this. In addition, it is not possible to confirm that the ejector rod has retracted to the retracted limit position in addition to being restrained by, so it takes an extra long time to press the operation button in order to reliably retract the ejector rod to the retracted limit position. It was necessary, and there was a problem that time was lost by this amount.

The present invention has been made in view of the above circumstances, and provides an injection molding machine capable of smoothly ejecting an ejector rod from a through hole of a table when manually operated. The purpose is to

[0008]

In order to achieve the above object, in an injection molding machine according to claim 1 of the present invention, a movable table provided with a plurality of molds on one surface, and the table is driven. And a table driving device for moving the ejector pin provided in the mold by inserting the tip into the mold through a through hole provided in the table. An ejector rod that presses the resin molded product in the mold to release it from the mold, a rod drive device that drives the ejector rod to be inserted into and removed from the through hole of the table, and the table drive device An injection molding machine comprising: a controller for controlling the operation of the rod drive device,
The control device controls the backward movement from the ejector backward movement button.
The ejector rod retract signal is received only while the signal is being received.
The retracting signal generating means for emitting and the tip of the ejector rod are detected to be located in the through hole of the table, and a detection signal is issued while the tip is located in the through hole. a rod position detector that keeps the retraction signal generating means
By receiving the backward signal of the ejector rod from retracting the ejector rod on the basis of the detection signal emitted from the rod position detector that allowed to continue operation of the rod driving device until withdrawn from the through hole of the table It is characterized by comprising an operation control means.

In the injection molding machine thus constructed, when the ejector rod is retracted by the rod driving device until its tip is positioned in the through hole of the table, the rod position detector detects and detects it. By issuing a signal and the retreat operation control means receiving the retreat signal, the operation of the rod drive device is controlled based on the detection signal issued from the rod position detector, whereby the ejector rod is pulled out from the through hole of the table. Will be issued. That is,
When the tip of the ejector rod is located in the through hole, the retreat operation control means pulls out the ejector rod from the through hole of the table.

According to a second aspect of the present invention, there is provided the injection molding machine according to the first aspect, wherein the control device issues a movement signal for moving the table to the table driving device and the retreat signal generating means. To eject
Characterized in that it has a movement signal generating hand stage that generates a retraction signal Taroddo.

In the injection molding machine configured as described above, the backward signal generating means issues the backward signal to the backward movement control means by receiving the backward moving signal, and the backward signal is received by the backward signal generating means. The backward movement control means controls the operation of the rod driving device based on the detection signal emitted from the rod position detector, whereby the ejector rod is pulled out from the through hole of the table.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an injection molding machine of the present invention will be described below with reference to FIGS.

(First Embodiment) FIG. 1 shows the configuration and structure of an injection molding machine 1a. 1A is a side sectional view, and FIG. 1B is a partially enlarged view of FIG. The injection molding machine 1a includes a movable table 3 on one side of which a mold 2 is arranged, and a table drive motor 4 for driving the table 3.
(Table driving device), an ejector rod 5 which is provided on the other surface side of the table 3, and whose distal end portion is arranged to be able to be taken in and out of the mold 2 through a through hole 3a provided in the table 3, and the mold 2 A plurality of ejector pins 6 that are provided inside and that are pushed by the tip of the ejector rod 5 to project from the molding surface of the mold 2 and press the resin molded product W in the mold 2 to release it. , Ejector rod 5
Of the rod drive device 7 for moving forward or backward so as to insert and withdraw the into and from the through hole 3a of the table 3, and a control device 8 capable of automatic control and manual control of operations of the table drive motor 4 and the rod drive device 7. And with.

The table 3 has a rotating shaft O provided at the center thereof.
It is a substantially disk-shaped member that is rotatably arranged around a shaft, and has teeth formed on its side surface so as to engage with a drive gear 4b of the table drive motor 4 described later. The table drive motor 4 has a drive shaft 4a and a table 3
A drive gear 4b that engages with teeth provided on the side surface of the table 3 to directly rotate the table 3 and whose operation is controlled by a table rotation controller 18 (described later) of the controller 8. Is.

Each of the plurality of ejector pins 6 is connected to the ejector plate 9 at its end on the table 3 side, and the tip of the ejector rod 5 presses the ejector plate 9 to integrate the plurality of ejector pins 6. It is arranged so that it can be pressed. In addition, the ejector pin 6 is attached to the mold 2 by a biasing member (not shown).
It is urged in such a direction as to prevent it from protruding from the molding surface and is usually housed in the mold 2.

The rod driving device 7 has a fixed plate 10 fixedly provided at a position separated from the surface of the table 3.
A ball screw mechanism 11 in which a nut member 11b is screwed to a screw shaft 11a provided on the table 3 side of the fixed plate 10 substantially perpendicular to the surface of the table 3 and rotatable about its own axis. , 11 are provided, the nut members 11b, 11b are fixedly provided with a movable plate 12 on the side facing the table 3 and on which the ejector rod 5 is provided so as to be substantially perpendicular to the surface of the table 3, and the screw shaft 11
A drive shaft 14a is connected to a and 11a via a power transmission mechanism 13, and a servo motor 14 for rotationally driving these screw shafts 11a is provided.

The ball screw mechanism 11 has a nut member 11b screwed to the screw shaft 11a when the screw shaft 11a is driven to rotate and a movable prestress provided on the nut member 11b.
The rod 12 and the ejector rod 5 are moved together with the screw shaft 11a in the axial direction, that is, in the direction toward and away from the table 3, whereby the ejector rod 5 is moved forward or backward. The power transmission mechanism 13 includes a drive pulley 13a fixedly provided on the drive shaft 14a of the servomotor 14, a screw shaft 11a of the ball screw mechanisms 11, 11.
Driven pulleys 13b, 13b fixedly provided on 11a
, The drive pulley 13a and the driven pulleys 13b, 13b are connected to rotate the drive pulley 13a by the driven pulley 13b,
13b and the drive belt 13c which transmits to 13b.

As shown in FIG. 2, the servomotor 14 operates according to a pulse signal P sent from a servo amplifier 23 (described later) of the controller 8. Further, the servo motor 14 outputs information on the rotation of the drive shaft 14a to
It has an encoder 14 b that converts the position information L of the ejector rod 5 that is moved forward or backward together with the movable plate 12 by the servo motor 14 and the ball screw mechanism 11 and sends this position information L to the servo amplifier 23.

As shown in FIG. 2, the control device 8 sets the operating condition I of the table drive motor 4 and the servo motor 14 (rod drive device 7) and starts the operation of the table drive motor 4 and rod drive device 7. An operation panel 15 for transmitting an instruction signal (described later) for instructing the operation, a backward signal generator 16 (reverse signal generating means) for issuing a backward signal B of the ejector rod 5 by receiving the instruction signal, and a backward signal B.
In response to the operation, the rod control device 17 (reverse movement control means) that issues a command signal D1 for instructing the servomotor 14 to operate according to the operation condition I set by the operation panel 15.
And a table rotation control device 18 which issues a command signal D2 for instructing the table drive motor 4 to operate in accordance with the operation condition I set by the operation panel 15, and the rod control device 1.
7 and a servo amplifier 23 (described later) of the servo motor 14 and a rod position detector 19 for detecting the position of the tip of the ejector rod 5.

The operation panel 15 includes a setter 21 for setting the operating condition I of the servo motor 14 and an ejector reverse button PB1 for issuing a reverse instruction signal SB only while the pusher is pressed.
Table rotation button PB2 (movement signal generation means) that sends a movement instruction signal SR (movement signal) when pressed and a start instruction signal ST that notifies the table rotation control device 18 of the start of automatic operation when pressed And a start button PB3 for issuing A memory 22 for storing the set operating condition I is provided after the setter 21.
Is provided. Here, the operating condition I of the table drive motor 4 and the servo motor 14 means whether the control of the table drive motor 4 and the rod drive device 7 is performed automatically,
Information about whether to perform manual control, the value of the retreat limit position S1 of the tip of the ejector rod 5, the value of the position S2 of the die mounting surface of the table 3 based on the retreat limit position S1, and the speed at which the ejector rod 5 is retracted. Value of V and servo motor 14
Indicates the value of the operating torque T.

The rod control device 17 reads the operating condition I from the memory 22 and receives the backward signal B, and based on the operating condition I and the detection signal F (described later) issued from the rod position detector 19, When the tip of the ejector rod 5 is in the through hole 3a of the table 3, a command signal D1 for instructing the operation of the servo motor 14 (rod driving device 7) so that the ejector rod 5 is pulled out from the through hole 3a of the table 3 is transmitted. It is something that is emitted. In addition, in the subsequent stage of the rod control device 17, a pulse signal P for controlling the operation of the servo motor 14 is sent based on the command signal D1 and the position of the tip of the ejector rod 5 sent from the encoder 14b of the servo motor 14 is sent. A servo amplifier 23 that sends information L to the rod position detector 19 is provided.

The table rotation control device 18 has a memory 2
By reading the operating condition I from 2 and receiving the movement instruction signal SR or the start instruction signal ST from the operation panel 15, the operating condition I and the backward movement confirmation signal C (described later) sent from the rod position detector 19 are received. Under the condition, the command signal D2 for instructing the operation of the table drive motor 4 is issued. Further, the table rotation control device 18
Monitors the operation of the table drive motor 4 and thereby grasps the state of rotation of the table 3 rotationally driven by the table drive motor 4.

The rod position detector 19 is the servo amplifier 2
Position information L of the tip of the ejector rod 5 sent from
And the position range specified by the operating condition I read from the memory 22 are compared, and the tip of the ejector rod 5 is within a predetermined range, that is, the position S2 of the die mounting surface of the table 3.
And the backward limit position S1 are detected, and a detection signal F is emitted. In addition, the rod position detector 1
9 indicates whether the value of the position information L of the tip of the ejector rod 5 is equal to the retract limit position S1 of the tip of the ejector rod 5,
Alternatively, when it is less than that, it detects that the ejector rod 5 has reached the retreat limit position S1 and issues the retreat confirmation signal C.

The operation of retracting the ejector rod 5 in the injection molding machine 1a will be described below. by the way,
The retracting operation of the ejector rod 5 is performed by manually controlling the ejector retracting button PB1 of the operation panel 15 and by manually controlling the table 3 by rotating the table rotation button PB2. There are three operating methods: the case and the case where the injection molding machine 1a is automatically controlled. Here, first, a case in which the ejector retreat button PB1 is pressed will be described with reference to the flowchart of FIG.

First, the operating condition I of the servomotor 14 is set by the setting device 21 of the operation panel 8 and stored in the memory 22. That is, the value of the retreat limit position S1 of the tip of the ejector rod 5, the value of the position S2 of the die mounting surface of the table 3 based on the retreat limit position S1, the value of the speed V for retracting the ejector rod 5, and the servo motor 14 The value of the operating torque T is set and the table drive motor 4 and the rod drive device 7 are controlled by manual control (step Sa1). Next, by pressing the ejector retreat button PB1 of the operation panel 21 (step Sa2), the retreat instruction signal SB is sent to the retreat signal generator 16 only while the ejector retreat button PB1 is pressed, and the retreat signal generator 16 is sent. The backward signal B is transmitted only while receiving the backward instruction signal SB (step Sa3). As a result, the rod control device 17 issues the command signal D1 to operate the servomotor 14 (rod drive device 7) according to the operating condition I, and causes the ejector rod 5 to move backward only while the ejector reverse button PB1 is being pressed.

Then, the rod position detector 19 compares the value of the position information L of the tip of the ejector rod 5 with the value of the position S2 of the die mounting surface of the table 3, and the value of L is smaller than the value of S2. In this case, that is, when the tip of the ejector rod 5 is not projected from the die mounting surface of the table 3 and is located inside the through hole 3a of the table 3, until the tip of the ejector rod 5 reaches the retreat limit position S1. Detection signal F
Continues to be emitted, and if not, the transmission of the detection signal F is stopped and the process returns to step Sa2 (step Sa4). As a result, the rod control device 17 causes the rod position detector 19 to operate.
Command signal D1 for driving the servomotor 14 to retract the ejector rod 5 while receiving the detection signal F from
Keep emitting. That is, the transmission of the command signal D1 by the rod control device 17 is held (step Sa
5).

Then, the rod control device 17 monitors the detection signal F of the rod position detector 19 (step Sa
6) While the detection signal F is being transmitted, that is, when the tip of the ejector rod 5 has not reached the retreat limit position S1, the rod control device 17 continues to issue the command signal D1 (step Sa7), and the step again. Returning to Sa4, the detection signal F is continuously monitored. Then, when the transmission of the detection signal F is stopped, that is, when the tip of the ejector rod 5 reaches the backward limit position S1, the rod control device 17 stops the transmission of the command signal D1 and the backward operation of the ejector rod 5. To finish.

Next, the retracting operation of the ejector rod 5
By pressing the table rotation button PB2, the table 3
The case of performing it in conjunction with the rotational movement of is described with reference to the flowchart of FIG. First, the setting device 2 of the operation panel 8
The operating condition I of the servomotor 14 is set by 1 and stored in the memory 22. That is, the value of the retreat limit position S1 of the tip of the ejector rod 5, the value of the position S2 of the die mounting surface of the table 3 based on the retreat limit position S1, the value of the speed V for retracting the ejector rod 5, and the servo motor 14 The value of the operating torque T is set and the table drive motor 4 and the rod drive device 7 are controlled by manual control (step Sb1). If the table drive motor 4 and the rod drive device 7 are set to be automatically controlled, the process proceeds to step Sb8.

Next, the table rotation button P on the operation panel 21
By pressing B2 (step Sb2), the movement instruction signal SR is sent to the table rotation control device 18 and the backward movement signal generator 16 (step Sb3), and the backward movement signal generator 1
6 causes the backward signal B to be transmitted. Here, the table rotation control device 18 monitors the backward movement confirmation signal C from the rod position detector 19 (step Sb4), and when the backward movement confirmation signal C is not transmitted, that is, the tip of the ejector rod 5 reaches the backward movement limit position S1. If not, the transmission of the command signal D2 to the table drive motor 4 is suspended. And
Since the rod control device 17 continues to issue the command signal D1 (step Sb5), it returns to step Sb4 and continues to monitor the backward movement signal C. When the backward movement confirmation signal C is received from the rod position detector 19, the process proceeds to step Sb6.

Then, in step Sb6, the table rotation control device 18 monitors the operation of the table drive motor 4 to confirm whether or not the rotational movement of the table 3 by the table drive motor 4 is completed. here,
When the rotational movement of the table 3 is not completed, the table drive motor 4 is issued a command signal D2 to operate the table drive motor 4 to rotate the table 3 (step Sb7), and the process returns to step Sb6. And table 3
When the rotation of the table is finished, the table rotation control device 18
Of the command signal D2 by the ejector rod 5
The reverse operation of is completed.

Here, the operation of the injection molding machine 1a when the control of the table drive motor 4 and the rod drive device 7 is set to be automatically controlled will be described. The operation is automatically selected (step Sb8). ), When the automatic control is not performed, the operation is stopped, and when the automatic control is performed, by pressing the start button PB3 of the operation panel 15 (step Sb9), the table rotation control device 18 and the backward signal generation device. A start instruction signal ST is sent to 16, the backward signal generator 16 is caused to send a backward signal B, and the routine proceeds to step Sb3. Then, thereafter, the operation is performed according to the above steps Sb3 to Sb7.

In the injection molding machine 1a thus constructed, when the tip of the ejector rod 5 is located in the through hole 3a of the table 3 when the ejector rod 5 is retracted by manual control, that is, the table 3 Position S2 on the die mounting surface and the retracting limit position S1 of the ejector rod 5
If it is located between the rod control device 1 and the rod control device 1, the rod position detector 19 detects it.
7 controls the operation of the servomotor 4 (rod drive device 7) to move the ejector rod 5 backward to the backward limit position S1. Further, when the ejector rod 5 is moved backward by manual control, by pressing the table rotation button PB2, the backward signal generator 16 issues a backward signal B, which causes the rod controller 17 to drive the servomotor 4 (rod drive). The operation of the device 7) is controlled to retract the ejector rod 5 to the retracted limit position S1.

According to the injection molding machine 1a constructed as described above, when the tip of the ejector rod 5 is located in the through hole 3a of the table 3 when the ejector rod 5 is retracted by manual control, the ejector rod 5 is ejected. The rod 5 is automatically retreated to the retreat limit position S1, interference between the ejector rod 5 and the table 3 is avoided, and the rotational movement of the table 3 is allowed. Therefore, even if the operator forgets to retract the ejector rod 5 to the retract limit position S1, the ejector rod 5 can be smoothly retracted. Further, by pressing the table rotation button PB2, the ejector rod 5 is retracted to the retreat limit position S1, so that when the ejector rod 5 tries to rotate the table without retracting to the retract limit position S1. Therefore, the interference between the ejector rod 5 and the table 3 is automatically avoided. And in any case,
Since the ejector rod 5 is automatically retracted, the operator is not restricted by the retracting operation of the ejector rod 5, and the ejector rod 5 can be smoothly retracted.

(Second Embodiment) A portion relating to the manual operation control of the operation panel 15, the backward signal generator 16 and the rod position detector 17 of the controller 8 in the injection molding machine 1a will be described.
An injection molding machine 1b is configured as the relay sequence circuit R shown in FIG. In FIG. 5 (a),
Reference numerals 31 and 32 denote control power supply busbars.
Between 32, from the bus bar 31 side, the manual control selection switch M
(A contact), ejector forward button PB4 (b contact),
Ejector reverse button PB5 (a contact), ejector reverse limit switch LS1 (b contact), solenoid X
1 are connected in series. A circuit in which a relay X1 (a contact) and a die mounting surface limit switch LS2 (a contact) are connected in series is connected in parallel to the ejector reverse button PB5. Further, a table rotation button PB6 (a contact) is connected in parallel to the ejector reverse button PB5.

The manual control selection switch M is provided on the operation panel 15 and is pushed to operate the rod control device 17.
The table rotation control device 18 is also provided with a signal notifying that the operation control is performed manually. The ejector advance button PB4 is provided on the operation panel 15, and when pressed, sends an instruction signal for advancing the ejector rod 5 to the rod control device 17. The ejector reverse button PB5 is a switch provided on the operation panel 15. As shown in FIG. 5B, in the ejector retreat limit switch LS1, the movable plate 12 of the rod drive device 7 is in the retreat limit position, that is, the tip of the ejector rod 5 provided on the movable plate 12 is in the retreat limit position S1. It is pressed by the movable plate 12 when performing. When the solenoid X1 is excited, it operates a relay (not shown) that activates a circuit that issues a retraction signal B to the rod control device 17. The solenoid X1 retreats in the relay sequence circuit R together with this relay and circuit. It constitutes a signal generator.

The relay X1 is closed by exciting the solenoid X1 and constitutes a self-holding circuit together with the solenoid X1. The mold mounting surface limit switch LS2 is pressed by the movable plate 12 of the rod driving device 7 when the tip of the ejector rod 5 is within the range from the same position as the mold mounting surface of the table 3 to the retracted limit position S1. The relay position circuit is provided in the relay sequence circuit R together with the reverse limit switch LS1.

When the table rotation button PB6 is pressed, it sends a movement instruction signal SR (movement signal) to the table rotation control device 18 to operate the table drive motor 4, and the table rotation button PB6 moves in the relay sequence circuit R. It constitutes a signal generating means.

A retreat operation by manual control of the ejector rod 5 in the injection molding machine 1b having the relay sequence circuit R thus constructed will be described. Here, this operation is performed according to the flowchart shown in FIG. 3 described in the first embodiment. Also,
In the initial state, the ejector rod 5 is projected from the die mounting surface of the table 3. That is, it is assumed that the backward limit switch LS1 is closed and the mold mounting surface limit switch LS2 is open.

First, the manual control selection switch M is pressed to close its contact, and manual control is selected (step Sa).
1). Then, the ejector retreat button PB5 is pressed to close the contact (step Sa2). Here, the ejector forward button PB4 and the reverse limit switch LS
Since 1 is closed, the buses 31 and 32 are connected, the solenoid X1 is excited, and the backward movement signal B is transmitted to the rod control device 17 (step Sa3). Then, the flow of control proceeds to step Sa4. In parallel with this, the solenoid X1 is excited to close the relay X1.

In step Sa4, the ejector rod 5
Is moved to the through hole 3a of the table 3 or not. Here, when the tip of the ejector rod 5 moves to the same position as the position S2 of the die mounting surface of the table 3, the movable plate 12 of the rod driving device 7 presses the die mounting surface limit switch LS2. Since the contact is closed, even if the ejector reverse button PB5 is released and the contact is opened by this, the bus bar 31,
32 is connected, solenoid X1 continues to be excited,
Transmission of the backward signal B to the rod control device 17 is maintained. That is, the backward movement of the ejector rod 5 is held (step Sa5). Then, the control flow proceeds to step Sa6. When the ejector rod 5 has not moved to the same position as the position S2 of the die mounting surface of the table 3, the die mounting surface limit switch LS2 remains open, so the ejector retreat button PB5 is released and its contact point is changed. When opened, the connection between the busbars 31 and 32 is cut off,
The excitation of the solenoid X1 stops. Then, the transmission of the retreat signal B to the rod control device 17 is stopped, the retreat of the ejector rod 5 is stopped, and the process flow proceeds to step Sa.
Return to 2.

At step Sa6, the ejector rod 5
Has reached the backward limit position S1. Otherwise, the contact of the backward limit switch LS1 remains closed, so that the buses 31 and 32 continue to be connected,
The solenoid X1 continues to be excited. Then, the transmission of the backward signal B to the rod control device 17 is maintained, the backward movement of the ejector rod 5 is held, and the process flow returns to step Sa4 (step Sa7). When the ejector rod 5 reaches the backward limit position S1, the movable plate 12 of the rod driving device 7 operates the backward limit switch LS1 to open its contact, thereby connecting the busbars 31 and 32. Is cut off and the excitation of the solenoid X1 is stopped. Then, the transmission of the backward signal B to the rod control device 17 is stopped, the backward movement of the ejector rod 5 is stopped, and the backward operation of the ejector rod 5 is completed.

By the way, in the injection molding machine 1b having the relay sequence circuit R configured as described above, in addition to the reverse operation by pressing the ejector reverse button PB5, the reverse limit switch LS1 is closed. By pressing the table rotation button PB6, the busbars 31 and 32 are connected, and the solenoid X1 is excited regardless of the open / close state of the ejector reverse button PB5, the relay X1, and the mold mounting surface limit switch LS2. . Then, until the ejector rod 5 reaches the retreat limit position S1, the transmission of the retreat signal B to the rod control device 17 is maintained, and when the ejector rod 5 reaches the retreat limit position S1, the ejector rod 5 is ejected in the same manner as the above process. Rod 5
The backward operation of is completed.

According to the injection molding machine 1b configured as described above, when the tip of the ejector rod 5 is located in the through hole 3a of the table 3 when the ejector rod 5 is retracted by manual control, the ejector rod 5 is ejected. The rod 5 is automatically retreated to the retreat limit position S1, interference between the ejector rod 5 and the table 3 is avoided, and the rotational movement of the table 3 is allowed. Therefore, even if the operator forgets to retract the ejector rod 5 to the retract limit position S1, the ejector rod 5 can be smoothly retracted. Further, since the ejector rod 5 is retracted to the retreat limit position S1 by pressing the table rotation button PB6, when attempting to rotate the table when the ejector rod 5 is not retracted to the retreat limit position S1, Automatically ejector rod 5 and table 3
Interference with can be avoided. In any case, since the ejector rod 5 is automatically retracted, the operator is not restricted by the retracting operation of the ejector rod 5 and can smoothly perform the retracting operation of the ejector rod 5.

In the above first and second embodiments,
The table 3 is a substantially disk-shaped table that rotates about the rotation axis O, that is, a so-called rotary table.
The present invention is not limited to this, and a so-called slide table that is formed in a substantially rectangular plate shape and is rotated or slid by a table driving device may be used. In the first and second embodiments described above, the rod driving device 7 is an electrically-operated one including the ball screw mechanism 11, the power transmission mechanism 13, and the servomotor 14, but the present invention is not limited to this. As long as the operation of the rod 5 can be controlled, the system of the rod driving device 7 is not particularly limited.
A hydraulic drive device including a hydraulic piston or the like that moves forward or backward by directly pressing or pulling the movable plate 12 or the ejector rod 4 may be used.

[0045]

According to the injection molding machine of claim 1, the hand
When the ejector rod is retracted by dynamic control,
When the ejector reverse button is pressed, the reverse signal generating means
In response to the backward signal generated by the
When the ejector rod is retracted by the rod drive device until the tip of the ejector rod is retracted into the through hole of the table, the rod position detector detects this and the tip is moved through the through hole. continuing issues between detection <br/> outgoing signal is located within, based on the detection signal emanating from the retraction controller Gallo head position detector, allowed to continue operation of the rod driving device, whereby the ejector The rod is retracted until it is pulled out from the through hole of the table. That is, when the tip of the ejector rod is located in the through hole, the retreat operation control means retracts the ejector rod until the ejector rod is pulled out from the through hole of the table.
Stop pressing the ejector reverse button halfway.
Even if the operator forgets to retract the ejector rod to the retracted limit position, the ejector rod can be smoothly retracted. Moreover, since the ejector rod is automatically retracted, the operator is not restricted by the retracting operation of the ejector rod, and the retracting operation of the ejector rod can be smoothly performed.

According to the injection molding machine of the second aspect, when the movement signal generated from the movement signal generation means is received, the backward movement signal generation means issues the backward movement signal to the backward movement control means,
By receiving the retreat signal, the retreat operation control means controls the operation of the rod drive device based on the detection signal issued from the rod position detector, whereby the ejector rod is pulled out from the through hole of the table.

[Brief description of drawings]

[1] A diagram showing the configuration and construction of the injection molding machine in the first embodiment of the present invention, portions of FIG. 1 (a) is a side view, FIG. 1 (b) FIGS. 1 (a) FIG.

FIG. 2 is a block diagram showing a configuration of a control device of the injection molding machine according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a flow of operation (manual control) of the injection molding machine according to the first and second embodiments of the present invention.

FIG. 4 is a flowchart showing a flow of operations (manual, automatic control) of the injection molding machine according to the first embodiment of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a control device for an injection molding machine according to a second embodiment of the present invention.

[Description of Reference Signs] 1a, 1b Injection molding machine 4 Table drive motor (table drive device) 5 Ejector rod 7 Rod drive device 8 Control device 16 Retraction signal generation device (retraction signal generation means) 17 Rod control device (reverse movement control means) ) 19 Rod position detector PB1 Ejector retract button PB2 Table rotation button (movement signal generation means)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 45/40 B29C 45/76

Claims (2)

(57) [Claims] 1. A movable table having a plurality of molds provided on one surface thereof, a table drive device for driving the table to move the table, and a table provided at the other surface side of the table and having a tip provided on the table. An ejector rod that is inserted into the mold through a through hole formed therein to press the resin molded product in the mold to release it through an ejector pin provided in the mold; and the ejector rod. An injection molding machine comprising: a rod drive device that drives the table to be inserted into and pulled out of the through hole of the table; and a control device that controls operations of the table drive device and the rod drive device. Is the backward instruction from the ejector backward button
The ejector rod retract signal is received only while the signal is being received.
The retracting signal generating means to be emitted and the tip of the ejector rod are detected to be located in the through hole of the table, and the tip is placed in the through hole.
A rod position detector that keeps calling between detection signals are located, by receiving the backward signal of the ejector rod from said retracted signal generating means, on the basis of the detection signal emitted from the rod position detector ejector injection molding machine rod is characterized by comprising a backward movement controlling unit that allowed to continue operation of the rod driving device until withdrawn from the through hole of the table. Wherein the control device, both the emit movement signal to move the table to the table drive device
In addition, the retract signal of the ejector rod is sent to the retract signal generating means.
Injection molding machine according to claim 1, characterized in that it has a movement signal generating hand stage that generates No..