JP4489250B2 - Interlocking drive device for injection mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interlock driving device for a mold for an injection molding machine, and in particular, a hydraulic pump attached to a movable mold or a movable platen by an eject mechanism, and a hydraulic pressure attached to the fixed die or the fixed platen by the hydraulic pressure. The present invention relates to an interlocking drive device that drives a pump to drive a movable mold part of a fixed mold and an eject member.
[0002]
[Prior art]
Conventionally, an injection molding machine has a stationary platen and a movable platen to which a fixed die and a movable die are respectively attached, a movable platen drive mechanism for driving the movable platen to perform mold clamping and mold opening, and a mold clamped die. A resin supply mechanism for supplying a molten synthetic resin to a molding cavity in the mold, an eject mechanism including an ejector rod inserted through a movable platen, and the like are provided.
[0003]
In an injection molding machine, normally, when the mold is opened after injection molding, the molded product is separated from the fixed mold while being held in the movable mold, and in this state, the molded product is moved by the ejector rod of the eject mechanism. Ejected from the mold. Since the fixed mold is formed with a gate for supplying the molten synthetic resin to the molding cavity in the mold, the molded product has a trace due to the separation of the gate and the synthetic resin in the gate.
[0004]
As shown in FIG. 8, for example, when the cap 102 is injection-molded by the fixed mold 100 and the movable mold 101, the back surface of the cap 102 is moved to the movable mold 101 side in order to eject the cap 102 from the movable mold 101. A molding cavity 103 is formed in the fixed mold 100 so as to face. Since a trace 102a is left on the surface of the molded cap 102 due to separation of the gate 104 and the synthetic resin 105 therein, the trace 102a deteriorates in appearance when the cap 102 is fitted in a bottle or the like.
[0005]
Therefore, as shown in FIG. 9, for example, by forming the molding cavity 103 in the movable mold 101 so that the back surface of the cap 102 faces the fixed mold 100 side, the gate is formed on the back surface of the molded cap 102. A trace 102a is formed by separation of 104 and the synthetic resin 105 therein. Therefore, even if the cap 102 is fitted in a bottle or the like, the appearance is not deteriorated because the trace 102a is not on the surface. In this case, however, the cap 102 must be ejected from the fixed mold 100.
[0006]
On the other hand, one or a plurality of movable mold parts are provided in the movable mold, and the movable mold parts are interlocked at a predetermined timing when the mold is opened, thereby improving the holding force for holding the molded product in the movable mold until ejection. At the same time, an interlocking device that can prevent damage to the molded product has been put to practical use. For example, Japanese Patent Laid-Open No. 10-175221 discloses a cam pivotally supported by one mold plate among a plurality of mold plates (movable mold parts) of a movable mold, and one mold plate other than the mold plate. An interlocking device including a post provided, a cam follower provided in a fixed mold, and the like is disclosed.
[0007]
In this interlocking device, the cam engages with the post in a clamped state, and when the movable mold is separated from the fixed mold from this state, the pair of mold plates to which the cam and the post are attached opens. Operation is allowed for a small gap between the engaged cam and post, and then the cam follower engages the cam and engages the cam post when the movable mold is separated from the fixed mold to some extent. And complete opening between the templates is allowed.
[0008]
[Problems to be solved by the invention]
However, as described above, when ejecting a molded product from a fixed mold, the existing eject mechanism cannot be used, and if an eject mechanism including another drive source must be provided on the stationary platen side, the structure is Larger and higher manufacturing costs. There is also a problem that it is difficult to provide this eject mechanism on the stationary platen side where the resin supply mechanism is provided.
[0009]
Here, even if an eject mechanism is not separately provided on the fixed platen side, a fixed mold and a movable mold are connected by a plurality of puller bolts, and the movable mold is separated from the fixed mold, thereby pulling a bolt, etc. It is possible to eject the molded product by pulling and driving the ejector member of the fixed mold through the. However, since the ejecting operation must be performed using the mold opening operation, the mold opening speed is limited, and the mold opening operation must be temporarily stopped. Efficiency drops considerably.
[0010]
An object of the present invention is to drive a movable mold part and an eject member of a fixed mold by using an existing ejection mechanism of an injection molding machine in an interlocking driving device for a mold for an injection molding machine, and a movable mold part. For example, it is possible to realize a smooth interlocking operation of the ejector member and the like, and to increase the efficiency of the injection molding operation.
[0011]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an interlocking driving device for a mold for an injection molding machine, comprising: a stationary platen and a movable platen to which a fixed die and a movable die are respectively attached; and an ejecting mechanism including an ejector rod inserted through the movable platen. In an injection molding machine, a hydraulic pump attached to the movable mold or movable plate and driven by an ejector rod of an ejection mechanism, and a movable mold part and molding of the fixed mold attached to the fixed mold or stationary plate An eject member for ejecting a product or a hydraulic actuator for driving only the eject member and a hydraulic hose for supplying hydraulic pressure from the hydraulic pump to the hydraulic actuator are provided.
[0012]
When the ejector rod of the eject mechanism drives the hydraulic pump attached to the movable mold or movable platen, the hydraulic pressure is supplied from this hydraulic pump to the hydraulic actuator attached to the fixed die or fixed platen via the hydraulic hose. Is done. That is, the hydraulic actuator is driven in conjunction with the hydraulic pump, and only the movable mold part of the fixed mold and the eject member or the eject member are driven by the hydraulic actuator. When the fixed mold and movable mold are opened, the force of the compressed gas can improve the holding power to the fixed mold until the molded product is ejected and prevent damage. By driving the member, the molded product can be ejected from the fixed mold.
[0013]
In this interlocking drive device for injection molding machines, a hydraulic pump, a hydraulic actuator, and a hydraulic hose are provided, so that the existing ejection mechanism of the injection molding machine can be used to move movable mold parts and ejectors of fixed molds. The member can be driven. That is, since it is not necessary to separately provide a driving mechanism including a movable mold part of a fixed mold and a drive source for driving the eject member, it is excellent in versatility and advantageous in manufacturing cost. For transmitting only the movable mold parts and ejection member or ejection member via the driving force of the eject mechanism hydraulic pump and the hydraulic hoses and the hydraulic actuator can be realized their smoothly interlocking operation. Since the movable mold part and the eject member can be driven and controlled independently of the mold opening operation, they can be driven at an appropriate timing to increase the efficiency of the injection molding operation.
[0014]
According to a second aspect of the present invention, there is provided an interlock driving device for a mold for an injection molding machine according to the first aspect of the present invention, wherein an ejector rod of an eject mechanism drives a hydraulic pump after the stationary mold and the movable mold are opened. It is a feature. After the mold opening, only the movable mold part of the fixed mold and the eject member or the eject member can be driven.
[0015]
According to a third aspect of the present invention, in the invention, the hydraulic actuator has a gas filling chamber filled with a compressed gas, and a fixed mold is formed by the compressed gas. The movement of the movable mold part is restricted, and the movable mold part of the piston rod and the fixed mold is returned to the return position. After the drive of the hydraulic pump is stopped, the piston rod can be returned to the return position by the compressed gas filled in the gas filling chamber in the hydraulic actuator, and can be held at the return position thereafter. Further, the movable mold part and the eject member can be returned to the return position in conjunction with the return operation of the piston rod, and thereafter, they can be held at the return position.
[0016]
According to a fourth aspect of the present invention, there is provided the interlock driving device for a mold for an injection molding machine according to the third aspect of the invention, wherein the hydraulic pump has a relief valve for relief when the hydraulic pressure becomes a predetermined pressure or more. It is. It is possible to prevent the hydraulic pump, the hydraulic actuator, the hydraulic hose, and the like from being damaged due to abnormally high hydraulic pressure.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is an example of the case where the present invention is applied to a horizontal injection molding machine that performs injection molding by mounting a fixed mold and a movable mold sideways.
[0018]
As shown in FIG. 1, the injection molding machine 1 basically has a stationary platen 4 and a movable platen 5 to which a fixed mold 2 and a movable mold 3 are respectively attached, and the movable platen 5 approaches the fixed platen 4. / Moveable plate driving mechanism 7 having a plurality of guide rods 6 that are movably guided and supported in a separating direction, a ram 7a for driving the movable plate 5 to perform mold clamping and mold opening, and a mold clamped A resin supply mechanism 8 having a screw conveyor 8a for supplying molten synthetic resin to molding cavities 2 and 3 and an eject mechanism 10 including an ejector rod 11 inserted through the movable platen 5 are provided.
[0019]
As shown in FIGS. 1 and 2, the fixed mold 2 has a plurality of plate-like movable mold parts 2a to 2c, fixed mold parts 2d and 2e, and a base 2f arranged in the left-right direction. Adjacent mold parts of 2a to 2d are connected so as to be separated by a predetermined distance in the left-right direction. The injection molding machine 1 includes a die interlocking drive device 20 unique to the present application for driving the movable mold parts 2a to 2c of the fixed mold 2 in conjunction with each other by driving the eject mechanism 10. Is provided.
[0020]
As shown in FIG. 1, the eject mechanism 10 has an eject plate 12 that can be moved and driven on the left side of the movable platen 5. An ejector rod 11 is attached to the eject plate 12 and extends to the right to pass through the movable platen 5. is doing. A hydraulic cylinder 13 is provided inside the ram 7, and the ejector rod 11 is driven forward and backward integrally with the eject plate 12 by the hydraulic cylinder 13.
[0021]
The interlocking drive device 20 will be described. As shown in FIGS. 1 and 2, the interlock driving device 20 is attached to the movable mold 3 and driven by the ejector rod 11 of the eject mechanism 10, and is attached to the fixed mold 2 and fixed mold. A hydraulic actuator 22 including a fluid pressure cylinder for driving the plurality of movable mold parts 2 a to 2 c and a hydraulic hose 23 for supplying hydraulic pressure from the hydraulic pump 21 to the hydraulic actuator 22 are provided.
[0022]
For example, one hydraulic pump 21 is provided at a position corresponding to the ejector rod 11, and one pair of hydraulic actuators 22 is provided symmetrically. The hydraulic pump 21 and the pair of hydraulic actuators 22 are respectively connected via hydraulic hoses 23. It is connected. The hydraulic hose 23 has such a length that the mold can be opened in a state where the hydraulic pump 21 and the hydraulic actuator 22 are connected.
[0023]
As shown in FIGS. 3 and 4, the hydraulic pump 21 has a housing 30, a plunger 35 having a piston portion 35a and an input rod portion 35b, a hydraulic operation chamber 36, an oil filling chamber 37, and a plunger 35 in a return position (see FIG. 3). ), A relief valve 39 that relieves when the hydraulic pressure in the hydraulic working chamber 36 exceeds a predetermined pressure, and the housing 30 with the input rod portion 35a facing the ejector rod 11. Is connected to the base 3 a of the movable mold 3.
[0024]
The housing 30 includes a housing main body 31, a sleeve 32, a lid member 33, and an additional case member 34. The hydraulic working chamber 36 is formed on the right side of the piston portion 35 a, and the hydraulic hose 23 is connected to a hydraulic port 36 a communicating with the hydraulic working chamber 36. The oil filling chamber 37 is formed in a portion surrounded by the plunger 35, the sleeve 32, the lid member 33, and the additional case member 34. A plurality of seal members are provided in the vicinity of the coupling between the members 31 to 34 of the housing 30 and at a plurality of locations between the housing 30 and the plunger 35.
[0025]
As shown in FIG. 3, when the plunger 35 is in the return position, the piston portion 35 a is positioned on the left side of the seal member 49, and the hydraulic working chamber 36 and the oil are passed through a plurality of oil passage holes 31 a formed in the housing body 31. The filling chamber 37 is in a communication state. When the plunger 35 is pushed rightward by the ejector rod 11 from this state, the oil in the hydraulic working chamber 36 is pressurized after the piston portion 35a reaches the seal member 49, and the hydraulic pressure is supplied to the hydraulic hose 23. Is supplied to the hydraulic actuator 22.
[0026]
When the plunger 35 moves to the left and right, the liquid level of the oil filled in the oil filling chamber 37 changes. At this time, the air is supplied to the extension case member 34 for air breathing between the inside of the oil filling chamber 37 and the outside. A discharge valve 40 and an air suction valve 41 are mounted. The oil filling chamber 37 is filled with a predetermined amount or more of oil so that air does not enter the hydraulic working chamber 36. The extension case member 34 is also provided with an oil filling port for filling the oil filling chamber 37 and an oil level gauge capable of measuring the liquid level of the filled oil.
[0027]
The relief valve 39 includes a valve seat forming member 45, a valve body 46 slidably fitted in the valve seat forming member 45, a compression coil spring 47 that biases the valve body 46 toward the valve seat 45 a, and a hydraulic operation chamber When the hydraulic pressure in 36 exceeds a predetermined pressure, the valve body 46 is pushed against the urging force of the compression coil spring 47 by the hydraulic pressure to open, and the oil in the hydraulic working chamber 36 is formed inside the plunger 35. The oil is filled into the oil filling chamber 37 via the oil passage 48, and the hydraulic pressure in the hydraulic working chamber 36 is prevented from becoming an abnormally high pressure.
[0028]
As shown in FIGS. 5 and 6, the hydraulic actuator 22 moves the cylinder member 50, the piston rod 53 having the piston portion 53a and the output rod portion 53b, the hydraulic operation chamber 54, and the piston rod 53 to the return position (see FIG. 5). A gas filling chamber 55 including a gas working chamber 55a filled with a compressed gas (for example, compressed nitrogen gas) that generates a force for returning and fastening, a connecting plate 56 connected to the tip of the piston rod 53, and the like. The cylinder member 50 is connected to the base 2 f of the fixed mold 2, and the connection plate 56 is connected to the flange 2 g of the movable mold part 2 a of the fixed mold 2.
[0029]
The cylinder member 50 has a cylinder body 51 and a guide member 52. The hydraulic working chamber 54 is formed on the right side of the piston portion 53 a, and the hydraulic hose 23 is connected to a hydraulic port 54 a that communicates with the hydraulic working chamber 54. Most of the gas filling chamber 55 is formed inside the piston rod 53, and the gas working chamber 55a is formed in an annular shape outside the output rod 53b between the piston portion 53a and the guide member 52. A plurality of seal members are provided in the vicinity of the coupling between the members 51 and 52 of the cylinder member 50, at a plurality of locations between the cylinder member 50 and the piston rod 53, and the like.
[0030]
A guide rod 57 is fixed to the coupling plate 56, extends rightward in parallel with the axis of the piston rod 53, and is slidably guided by a guide sleeve 58 that is fitted and fixed to the guide member 52. The guide member 52 and the cylinder body 51 are formed with a rod accommodation hole 59 that can accommodate the guide rod 57.
[0031]
A plurality of gas passage holes 53c are formed in the longitudinal center portion of the output rod portion 53b of the piston rod 53. As shown in FIG. 5, when the piston rod 53 is at the return position, the gas rod holes 53c are interposed. The gas filling chamber 55 and the gas working chamber 55a in the piston rod 53 are in communication with each other. As shown in FIG. 6, when the piston rod 53 is in the protruding position, the gas filling chamber 55 in the piston rod 53 communicates with the annular passage 52a formed from the inside in the guide member 52 through the gas passage hole 53c. Become. A check valve 60 is assembled to the guide member 52, and when the piston rod 53 is in the projecting position, the check valve 60 allows an internal gas source from the external gas supply source to pass through the annular passage 52a and the gas passage hole 53c. The gas filling chamber 55 can be filled with compressed gas.
[0032]
Since the hydraulic pressure is not generated when the plunger 35 of the hydraulic pump 21 is at the return position (see FIG. 3), the piston rod 53 of the hydraulic actuator 22 has a compressed gas filled in the gas filling chamber 55 as shown in FIG. It will be in the state which received the gas pressure and returned to the return position. When the plunger 35 of the hydraulic pump 21 is pushed rightward by the ejector rod 11, hydraulic pressure is generated (see FIG. 4), and as shown in FIG. 6, the hydraulic pressure (oil) is transferred to the hydraulic actuator via the hydraulic hose 23. 22 is supplied to the hydraulic working chamber 54 to move the piston rod 53 to the protruding position.
[0033]
The operation and effect of the interlock driving device 20 for the mold for the injection molding machine will be described. As shown in FIG. 1, the movable platen 5 is driven by the movable platen drive mechanism 7 while the hydraulic pump 21 is not driven by the ejector rod 11 of the ejector mechanism 10, and the fixed mold 2 and the movable die 3 are clamped. The molten synthetic resin is supplied to the molding cavities inside the molds 2 and 3 by the resin supply mechanism 8 and injection molding is performed.
[0034]
Since the plunger 35 is positioned at the return position when the hydraulic pump 21 is not driven (see FIG. 3), the hydraulic actuator 22 is not driven and the piston rod 53 is positioned at the return position (see FIG. 5). That is, the movable mold part 2a and the base 2f are connected via the hydraulic actuator 22 in a state where the piston rod 53 is located at the return position, and these mold parts 2a are caused by the return force by the compressed gas in the hydraulic actuator 22. ˜2d is connected and held in a state of being restricted.
[0035]
After the injection molding, as shown in FIG. 2, the movable platen 5 is driven by the movable platen drive mechanism 7 to open the fixed mold 2 and the movable mold 3. Thereafter, the ejector rod of the ejector mechanism 10 is opened. 11, the plunger 35 is pushed and the hydraulic pump 21 is driven (see FIG. 4). Then, since the hydraulic pump 21 generates hydraulic pressure, and the hydraulic pressure is supplied to the hydraulic actuator 22 via the hydraulic hose 23, the hydraulic actuator 22 is also driven (see FIG. 6).
[0036]
When the hydraulic actuator 22 is driven, the piston rod 53 advances, and at least the movable mold part 2a directly connected to the piston rod 53 is driven. However, due to the difference in spring force inside the fixed mold 2, The mold parts 2d and 2c are driven in conjunction with each other in the order between 2c and 2b, between 2b and 2a, and the adjacent mold parts 2a to 2d are opened to be separated by a predetermined distance. In this way, since the movable mold parts 2a to 2c of the fixed mold 2 can be driven in a predetermined order after the fixed mold 2 and the movable mold 3 are opened, the molded product is fixed until the ejection. The holding power to the mold 2 can be improved and damage can be prevented.
[0037]
Further, as shown in FIG. 7, an eject member 65 is provided in the fixed mold 2, and the ejected member 65 is driven by the hydraulic actuator 22, whereby the molded product 66 can be ejected from the fixed mold 2. In this case, the eject member 65 is operatively connected to one of the movable mold parts 2a to 2c, and the movable mold part is driven by the hydraulic actuator 22, thereby driving the eject member 65 in conjunction with each other. be able to.
[0038]
Since the molded product 66 can be ejected from the fixed mold 2 in this way, when the cap 66 as shown in FIG. 7 is injection-molded, the gate 68 and its gate are formed on the back surface of the cap 66 molded in the molding cavity 67. The cap 66 can be molded so that a trace 66a is formed by separation from the internal synthetic resin 69. Therefore, even if the cap 66 is fitted in a bottle or the like, the appearance is not deteriorated because the trace 66a is not on the surface.
[0039]
According to the interlocking drive device 20, the movable mold part of the fixed mold 2 is provided by using the existing eject mechanism 10 of the injection molding machine 1 by providing the hydraulic pump 21, the hydraulic actuator 22, and the hydraulic hose 23. 2a-2c and the eject member 65 can be driven. That is, since it is not necessary to separately provide a drive mechanism including a drive source for driving the movable mold parts 2a to 2c and the eject member 65 of the fixed mold 2, it is excellent in versatility and advantageous in production cost.
[0040]
For transmitting to the hydraulic pump 21 and the hydraulic hoses 23 and the movable mold parts 2a~2c and eject member 65 of the stationary mold 2 via a hydraulic actuator 22 driving force of the eject mechanism 10, their smoothly interlocking operation Can be realized. Since the movable mold parts 2a to 2c and the eject member 65 can be driven and controlled independently of the mold opening operation, they can be driven at an appropriate timing to increase the efficiency of the injection molding operation.
[0041]
In the hydraulic actuator 22, after the drive of the hydraulic pump 21 is stopped, the piston rod 53 can be returned to the return position by the compressed gas filled in the gas working chamber 55a of the gas filling chamber 55, and thereafter can be held at the return position. In conjunction with the return operation of the piston rod 53, the movable mold parts 2a to 2d and the eject member 65 can also be returned to the return position, and thereafter, they can be held at the return position.
[0042]
Since the hydraulic pump 21 is provided with a relief valve 39 that relieves when the hydraulic pressure exceeds a predetermined pressure, the hydraulic pump 21, the hydraulic actuator 22, the hydraulic hose 23, etc. can be prevented from being damaged due to the occurrence of abnormally high pressure.
[0043]
It should be noted that only the eject member can be driven by the hydraulic actuator 22. The hydraulic pump 21 may be attached to the movable platen 5 or the hydraulic actuator 22 may be attached to the fixed platen 4. The number, arrangement, structure, and the like of the hydraulic pump 21 and the hydraulic actuator 22 can be changed as appropriate. In addition, the present invention can be implemented in a form in which various modifications are added without departing from the gist of the present invention, and can be applied not only to the injection molding machine but also to various injection molding machines. .
[0044]
【The invention's effect】
According to the mold interlocking drive device for the injection molding machine of claim 1, by providing the hydraulic pump, the hydraulic actuator, and the hydraulic hose, the fixed mold can be moved using the existing ejection mechanism of the injection molding machine. Only the eject member or the eject member for ejecting the mold part and the molded product can be driven. Therefore, when the fixed mold and the movable mold are opened, the movable mold parts are driven at a predetermined timing to improve the holding power to the fixed mold until the molded product is ejected and prevent damage. The molded product can be ejected from the fixed mold by driving the eject member.
[0045]
Since it is not necessary to provide a separate drive mechanism including a movable mold part of a fixed mold and a drive source for driving an eject member, it is excellent in versatility and advantageous in production cost. For transmitting the driving force of the eject mechanism on the movable mold part and eject member through the hydraulic pump and the hydraulic hoses and the hydraulic actuator, it is possible to realize their smoothly interlocking operation. Since the movable mold parts and the eject member can be driven and controlled independently of the mold opening operation, these can be driven at an appropriate timing to increase the efficiency of the injection molding operation.
[0046]
According to the interlock driving device for the mold for an injection molding machine according to claim 2, after the opening of the fixed mold and the movable mold, the ejector rod of the eject mechanism drives the hydraulic pump to move the movable mold part and the ejector. Only the member or eject member can be driven.
[0047]
According to the interlock driving device of the mold for the injection molding machine according to claim 3, after the drive of the hydraulic pump is stopped, the hydraulic actuator is caused to return the piston rod to the return position by the compressed gas filled in the gas filling chamber, and thereafter Can also be held at the return position, and the movable mold part and the eject member can be returned to the return position in conjunction with the return operation of the piston rod, and thereafter they can be held at the return position.
[0048]
According to the interlock driving device of the mold for an injection molding machine according to claim 4, the hydraulic pump is provided with a relief valve that relieves when the hydraulic pressure exceeds a predetermined pressure, so that the hydraulic pressure becomes abnormally high and the hydraulic pump It is possible to prevent the hydraulic actuator, the hydraulic hose, etc. from being damaged.
[0049]
[Brief description of the drawings]
FIG. 1 is a side view of an injection molding machine and a mold for an injection molding machine (clamped state) according to an embodiment of the present invention.
FIG. 2 is a side view of an injection molding machine and a mold for an injection molding machine (in a mold open state).
FIG. 3 is a longitudinal sectional view of a hydraulic pump (returned state).
FIG. 4 is a longitudinal sectional view of a hydraulic pump (operating state).
FIG. 5 is a longitudinal sectional view of a hydraulic actuator (returned state).
FIG. 6 is a longitudinal sectional view of a hydraulic actuator (operating state).
FIG. 7 is a longitudinal sectional view of a fixed mold, a molded product, and an eject member.
FIG. 8 is a longitudinal sectional view of a mold and a molded product according to the prior art.
FIG. 9 is a longitudinal sectional view of a mold and a molded product according to another prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Fixed metal mold | dies 2a-2d Movable metal mold | die part 3 Movable metal mold | die 4 Fixed platen 5 Movable platen 10 Ejector mechanism 11 Ejector rod 20 Interlocking drive device 21 Hydraulic pump 22 Hydraulic actuator 23 Hydraulic hose 39 Relief valve 53 Piston rod 55 Gas filling chamber 65 Eject member

Claims (4)

An injection molding machine comprising a fixed plate and a movable plate to which a fixed die and a movable die are respectively attached, and an eject mechanism including an ejector rod inserted through the movable plate, and is attached to the movable die or the movable plate. A hydraulic pump driven by an ejector rod of an ejection mechanism, and a hydraulic pressure attached to the fixed mold or fixed platen and for ejecting only a movable mold part and a molded product of the fixed mold or an ejected member An interlock driving device for a mold for an injection molding machine, comprising: an actuator; and a hydraulic hose for supplying hydraulic pressure from the hydraulic pump to the hydraulic actuator.  The interlock drive apparatus for a mold for an injection molding machine according to claim 1, wherein the ejector rod of the eject mechanism drives the hydraulic pump after the opening of the fixed mold and the movable mold.  The hydraulic actuator has a gas filling chamber filled with compressed gas, the movement of the movable mold parts of the fixed mold is regulated by the compressed gas, and the movable mold parts of the piston rod and the fixed mold are returned to the return position. The interlock drive device for a mold for an injection molding machine according to claim 1 or 2, wherein  4. The interlock driving device for a mold for an injection molding machine according to claim 3, wherein the hydraulic pump has a relief valve that relieves when the hydraulic pressure becomes a predetermined pressure or more.

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