JPH0752214A - Motor-driven injection mold device - Google Patents

Abstract

PURPOSE:To provide an injection molding machine which has a little energy loss as compared with a conventional hydraulic injection molding machine and can be attained to elimination or reduction of energy. CONSTITUTION:A cavity 5 is formed by a method wherein a stationary mold 2 and movable mold 3 are clamped down and molten resin is injected to the cavity 5 by a plunger 6 through a hot tip 7. In a driving mechanism for mold breaking and clamping for the movable mold 3 consisting mainly of an electric motor 12, its rotation is converted into a linear motion while the rotation is being decelerated by a worm 16 and worm rack 13 and mold clamping.mold breaking of a movable mold 3 is performed through a york member 23 and toggle mechanism 14 by an advance.retreat of the worm rack 13. Then a driving mechanism for injection for a plunger 6 also consists mainly of an electric motor 40, a linear motion through mediation of the worm 16 and worm rack 13 is transmitted to the plunger 6 through a link mechanism which is moved forward for injection.

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,
In particular, the present invention relates to an injection molding machine characterized by a drive mechanism for opening and closing a mold and a drive mechanism for injection.

[0002]

2. Description of the Related Art Conventionally, generally, an injection molding machine is provided with a set of molds, at least one of which is a movable mold, which is guided by a mold opening / closing guide mechanism to open and close. A product cavity is formed therein. Then, for example, a screw, a plunger, or the like is provided as an injection member for injecting the molten resin into the cavity, and the molten resin is injected into the cavity as the injection member advances.

Conventionally, a hydraulic cylinder or an air cylinder (hereinafter represented by a hydraulic cylinder) is provided as a drive mechanism for opening and closing the mold as described above, and its piston rod is connected to a movable mold. Further, a similar hydraulic cylinder is provided for advancing and retracting an injection member such as a screw and a plunger, and a piston rod of the same hydraulic cylinder is connected to the injection member. The mold opening / closing hydraulic cylinder and the injection hydraulic cylinder are both connected to a hydraulic source by a hydraulic circuit, and the hydraulic source is provided with a hydraulic pump and an electric motor for driving the hydraulic pump.

[0004]

However, in the conventional injection molding machine, the hydraulic pump is driven by the electric motor, and this hydraulic pump pumps oil from the reservoir to generate hydraulic pressure, which passes through the hydraulic circuit to the hydraulic cylinder. The supplied oil pressure pushes out the piston in the cylinder, and finally drives the movable mold or drives the injection plunger. Therefore, the electric power supplied to the electric motor, in other words, the energy, leads to the drive of the movable type or the drive of the injection member only after passing through some stages, and there is a drawback that the energy loss is large.

An object of the present invention is to provide an injection molding machine having high energy efficiency and high energy saving effect.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, according to the present invention, in the injection molding machine as described above, at least one of the mold opening / closing drive mechanism and the injection drive mechanism is hydraulically operated or empty. The configuration is such that it is directly driven by an electric motor without using a pressure mechanism. That is,
The drive mechanism includes an electric motor, a motion converting mechanism that decelerates the rotation of the electric motor and converts the electric motor into a linear motion, and a connecting mechanism that connects the motion converting mechanism to the movable type or the injection member.

[0007]

By adopting such a drive mechanism, the rotation of the electric motor is decelerated by the motion conversion mechanism and converted into a linear motion, and this linear motion is moved through the connecting mechanism to the movable or injection member. And the movable die or the injection member is driven. Therefore, the electric power (energy) supplied to the electric motor is directly applied to the movable type or the injection member via the mechanical mechanism, and therefore compared with the case where it is converted into fluid pressure such as hydraulic pressure or pneumatic pressure. Little energy loss.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. An electric injection molding machine 1 whose plane is shown in FIG. 1 is a tabletop type having a width dimension of about 60 cm and a depth of about 80 cm, and includes a fixed die 2 and a movable die 3. The fixed die 2 is fixed to a frame 4 of the apparatus, and the movable die 3 moves horizontally with respect to the fixed die 2 so that the die is closed and opened. The product cavity 5 straddles the parting line (PL) of both molds 2 and 3 in the mold closed state.
Is formed, and the plunger 6 as an injection member advances, so that the molten resin is injected into the cavity 5 via the hot tip 7.

As a mechanism for guiding the movable die 3 in the mold opening / closing direction, neither a die plate nor a tie bar is provided in the present embodiment, and the movable die 3 serves as a lower side supporting portion as shown in FIG. It is supported by two guide members 10. Each guide member 10 is made of an oil-impregnated metal and slides the movable die 3 in the die opening / closing direction. The movable die 3 is placed on these guide members 10. Further, guide wall portions 11 are formed on both sides of the movable die 3 so as to contact the wall surfaces on both sides of the movable die 3, and the guide wall portions 11 are located along the moving direction of the movable die 3 as shown in FIG. The movable die 3 is guided in the die opening / closing direction while sliding on the guide wall portions 11 on both sides and the guide member 10 described above.

Next, a mold opening / closing drive mechanism for the movable mold 3 will be described, and then an injection drive mechanism for the plunger 6 will be described.

The drive source of the mold opening / closing drive mechanism is the electric motor 12 shown in FIG. 1. The rotation of the electric motor 12 is converted into the linear motion of the worm rack 13, and the yoke member 23, the toggle mechanism 14 and the like, which will be described later, are added. It is adapted to be transmitted to the movable mold 3 via the. As shown in FIG. 2, the electric motor 12 is installed vertically, and its output shaft 15 is installed.
Is output as the rotation of the worm 16 via the reduction mechanism as required. The worm 16 meshes with the worm rack 13 installed horizontally, and one rotation of the worm 16 moves the worm rack 13 by one pitch. The worm rack 13 is supported by a plurality of guide rollers 17, and its tip has a pin 18
Is connected to one end of the link 19 via the pin 18, and the pin 18 thereof is inserted into the elongated hole 20 formed in the link 19.

The link 19 is rotatably supported by a position-fixed shaft 21 in a vertical plane, and the other end thereof is connected to a yoke member 23 via a joint member 22. A long hole 34 is formed at the other end of the link 19, and the long hole 34
The horizontal pin 24 supported by the joint member 22
, And the above-mentioned yoke member 23 is rotatably attached at one end to a vertical shaft 25 provided in the joint member 22 in the vertical direction.

The yoke member 23 is divided into an upper arm 26 and a lower arm 27 at the tip end side thereof, and these are opposed to each other in the vertical direction. Each arm 26 and 27
1, the first links 28 constituting the toggle mechanism 14 are connected by shafts 29 at their respective one ends, and the other ends of the respective first links 28 are connected to the frame 4 of the apparatus.
Is connected by a shaft 30. Further, to the yoke member 23, one end of the second link 32 is connected to the movable die 3 by the shaft 31, and the other end of the second link 32 is connected by the shaft 29. The second link 32 is also provided as a pair of upper and lower parts, is positioned so as to sandwich the movable die 3 from above and below, and constitutes the toggle mechanism 14 together with the above-mentioned pair of first links 28.

When the toggle mechanism 14 is positioned as shown by the solid line in FIG. 1, the electric motor 12 shown in FIG. 2 rotates in one direction, and the worm rack 13 moves rightward in the drawing through the worm 16. When it moves forward, the link 19 rotates counterclockwise, and the yoke member 23 retracts via the joint member 22. As a result, as shown in FIG. 1, the shaft 29 retracts so that the angle formed by the toggle mechanism 14 becomes smaller, and as a result, the movable die 3 moves in the direction away from the fixed die 2. On the contrary, when the electric motor 12 rotates in the opposite direction, the worm rack 13 shown in FIG. 2 retracts to the left in the figure, and the yoke member 23 advances via the link 19. Therefore, the toggle mechanism 14 moves the movable mold 3 in FIG. 1 in the mold clamping direction and presses it against the fixed mold 2. This forms the product cavity 5.

Next, the injection drive mechanism for driving the plunger 6 shown in FIG. 1 will be described. This drive mechanism also includes, as a drive source, an electric motor 40 that is exactly the same as that of the mold opening / closing drive mechanism, and the electric motor 40 is provided side by side with the electric motor 12 described above. In FIG. 3, the configuration in which the rotation of the output shaft 15 of the electric motor 40 is taken out as the rotation of the worm 16 and the configuration in which the worm rack 13 meshing with the worm 16 moves forward and backward are the same as those of the electric motor 12 described above.

The tip of the worm rack 13 is connected to the elongated hole 42 of the link 41 via the pin 18. The link 41 is rotatably supported by a shaft 43 in a vertical plane, and the shaft 43 is supported by a bracket 44 fixed to the frame 4 side of the device. A long hole 45 is formed at the other end of the link 41, and a pin 46 inserted into the long hole 45 connects the link 41 to the plunger 6 through a joint member 47. Both ends of the pin 46 are attached to the bracket 44.
It is slidably inserted into a pair of horizontal guide grooves 53 formed in the horizontal direction, and the pin 46 moves while being guided in the horizontal direction.

The plunger 6 is accommodated in the tube 48 fixed to the frame 4 of the apparatus so as to be slidable in the axial direction, and the above-mentioned hot tip 7 is provided at the tip of the tube 48. The hot tip 7 has a heating cylinder and a nozzle integrated with each other, has a heater portion 49 and a nozzle portion 50 formed at the tip thereof, and injects resin directly into the gate of the cavity 5 in the nozzle portion 50.

A hopper 51 is provided above the tube 48. One shot of resin material (pellet) required for molding one product is put into the hopper 51 from the metering device 52, and this is supplied into the tube 48 with the plunger 6 lowered to the retracted position. . When the plunger 6 is retracted in such a manner, the link 41 is at the position shown by the chain double-dashed line, and the warm rack 1
3 is at the forward end position. When the electric motor 40 is rotated in one direction from this state, the worm rack 13 is retracted via the worm 16, and the link 41 is rotated counterclockwise to push out the plunger 6, so that one product is obtained. A corresponding one shot of molten resin is injected from the nozzle portion 50 of the hot tip 7 into the cavity 5.
Then, as the electric motor 40 rotates in the opposite direction, the worm rack 13 moves forward in reverse to the above, and the link 4
1 rotates clockwise, and the plunger 6 is retracted.

The entire injection cycle will be described with reference to FIG. The toggle mechanism 14 is driven by driving the electric motor 12.
The movable mold 3 is closed with respect to the fixed mold 2 via the, and this state is maintained by continuing to supply electric power to the electric motor 12. After that, the plunger 6 moves forward by driving the electric motor 40, and one shot of molten resin is injected into the cavity 5. After a lapse of a certain short time, the electric motor 40 rotates in the reverse direction to retract the plunger 6, and then the electric motor 12 rotates in the reverse direction to open the toggle mechanism 14 and open the mold of the movable mold 3. To do.

The product molded in the cavity 5 is a movable mold 3
The ejector member 53 is incorporated in the movable mold 3 so as to be movable in the mold opening / closing direction, and the ejector member 53 hits the stopper 54 fixed to the frame 4 of the apparatus during the mold opening process of the movable mold 3. As a result, the product (5) is ejected from the movable mold 3 and falls downward. The product (5) is free of extras such as runners and has a high material yield.

In this embodiment, the mold opening / closing drive mechanism and the injection drive mechanism both mechanically drive the movable die 3 and the plunger 6 using the electric motors 12 and 40 as drive sources. Therefore, compared with the case of using the hydraulic cylinder, the energy of the electric motors 12 and 40 directly reaches the movable die 3 or the plunger 6. That is, compared with the case where the hydraulic pump is rotated by the electric motor and the oil is sent to the hydraulic cylinder through the hydraulic circuit, and thereby the piston is moved to drive the movable die, the energy loss is small and the energy efficiency is good.

Further, in this embodiment, in guiding the movable die 3 in the opening / closing direction, there is no conventional die plate or tie bar, and the movable die 3 has a lower guide member 10 and guide wall portions on both sides. Since it is slidably supported by 11, the space for disposing the movable die 3 can be small, and the hydraulic cylinder and its hydraulic source are not required as described above, so that the overall structure is compact. Further, when the movable mold 3 is opened and closed, it is not necessary to move an extra heavy object such as a die plate as in the conventional case, so that the driving force for opening and closing the mold is small due to the lightness, which also leads to energy saving. .

In the above embodiment, both the mold opening / closing drive mechanism and the injection drive mechanism are driven by electric motors, but only one of them is driven by an electric motor. May be Although the toggle mechanism 14 is provided for opening and closing the mold in this embodiment, the movable mold 3 may be directly connected to a portion corresponding to the yoke member 23, and the fixed mold 2 may be provided so as to face the movable mold 3. . Further, in the above embodiments, the electric motor 12 or 4
The rotation of 0 was reduced by the worm mechanism, but the end gear of the reduction mechanism was used as a pinion and the rack was engaged with this, or the rotation of the end gear was converted into a linear motion by the piston crank mechanism. It can also be converted.

[0024]

According to the present invention, at least one of the mold opening / closing drive mechanism and the injection drive mechanism is driven by an electric motor, and the rotation of the electric motor is converted into a linear motion to move the movable type and / or the movable type. By driving the injection member, there is less loss of drive energy compared to a hydraulic (or pneumatic) type injection molding machine, and energy saving is achieved. That is, the driving force of the electric motor is converted into hydraulic pressure,
Further, as compared with the case where it is transmitted to a movable mold or the like via a hydraulic circuit and a cylinder, the driving force of the electric motor is directly used for mold opening / closing and injection, so that energy efficiency is high.

[Brief description of drawings]

FIG. 1 is a plan view of an electric injection molding machine that is an embodiment of the present invention.

FIG. 2 is a left side view thereof.

FIG. 3 is a right side view thereof.

[Explanation of symbols]

 1 Electric Injection Molding Machine 2 Fixed Type 3 Movable Type 5 Cavity 6 Plunger (Injection Member) 10 Guide Member 11 Guide Wall Part 12, 40 Electric Motor 13 Worm Rack 14 Toggle Mechanism 16 Worm 19 Link 23 Yoke Member 28 First Link 32 No. Two links 41 links

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[Procedure amendment]

[Submission date] June 26, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Electric injection molding device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric injection molding die device.
Regarding the table

[0002]

2. Description of the Related Art Conventionally, generally, an injection molding machine is provided with a set of molds, at least one of which is a movable mold, which is guided by a mold opening / closing guide mechanism to open and close. A product cavity is formed therein. Then, for example, a screw, a plunger, or the like is provided as an injection member for injecting the molten resin into the cavity, and the molten resin is injected into the cavity as the injection member advances.

Conventionally, a hydraulic cylinder or an air cylinder (hereinafter represented by a hydraulic cylinder) is provided as a drive mechanism for opening and closing the mold as described above, and its piston rod is connected to a movable mold. Further, a similar hydraulic cylinder is provided for advancing and retracting an injection member such as a screw and a plunger, and a piston rod of the same hydraulic cylinder is connected to the injection member. The mold opening / closing hydraulic cylinder and the injection hydraulic cylinder are both connected to a hydraulic source by a hydraulic circuit, and the hydraulic source is provided with a hydraulic pump and an electric motor for driving the hydraulic pump.

[0004]

However, in the conventional injection molding machine, the hydraulic pump is driven by the electric motor, and this hydraulic pump pumps oil from the reservoir to generate hydraulic pressure, which passes through the hydraulic circuit to the hydraulic cylinder. The supplied oil pressure pushes out the piston in the cylinder, and finally drives the movable mold or drives the injection plunger. Therefore, the electric power supplied to the electric motor, in other words, the energy, leads to the drive of the movable type or the drive of the injection member only after passing through some stages, and there is a drawback that the energy loss is large. Also,
Mold device, mold opening / closing mechanism, opening / closing drive device, injection mechanism and
These drive units are connected to each other and the injection molding system
Since it is composed of a
I need it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric injection molding die device which has high energy efficiency and a high energy saving effect.

[0006]

In order to solve such a problem, the present invention eliminates the need for a hydraulic cylinder or the like from the drive source.
Eliminate all electric motors and
All the drive mechanism mainly consisting of
The gist is that it is a mold with a built-in drive mechanism.
That is, the features of the mold apparatus according to the present invention are at least
A pair of cavity core members, one of which is a movable part,
A mold plate that guides the cavity and core members so that they can be opened and closed.
And a set of cabinets supported by the mold base.
An injection member for injecting molten resin into the tee core member,
Of the first and second electric motors and the first electric motor
First motion conversion that decelerates rotation and converts it into linear motion
A mechanism, a first motion conversion mechanism, and the movable part are connected.
Rotation of the first electric motor and the second electric motor
A second motion conversion mechanism that decelerates and converts to linear motion
And connecting the second motion conversion mechanism and the injection member.
A second connecting mechanism, and the first and second
Electric motor, first and second motion conversion mechanism, and
All of the first and second connection mechanisms are
Supported on the part of the cavity that does not interfere with the cavity core member
This is the point of forming one mold device.

[0007]

[Operation and effect] As described above, the cavity is formed in the mold base.
.Core members, injection members and drive mechanisms therefor
At first glance, with the mold being integrated,
Compact mold with all necessary mechanisms
The device is realized. Moreover, the driving force of each electric motor
To mechanically act directly on the
The hydraulic cylinder generated by the hydraulic pressure
There is less energy loss compared to the one that operates, and it saves energy.
It also becomes energy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The electric injection molding die apparatus 1 whose plane is shown in FIG.
It can be used as a desktop type with a width of about 60 cm and a depth of about 80 cm.
And includes cavity core members 2 and 3. In addition, the resin product after molding is a member when opening the mold.
3, the member 2 will be referred to as a cavity member and a member 3 thereafter.
Will be referred to as a core member. Cavity member 2 and
The core member 3 is supported by the mold base 5,
The mold base 5 has the above-described width and depth dimensions of the mold device 1.
It is almost the same rectangular shape. And the mold base 5
The housing 4 is formed in a rectangular parallelepiped shape along the four sides of
Therefore, the mold device 1 looks like a square box from the outside.
It looks like this. The cavity member 2 includes the base 5 and
And the housing 4, and the core member 3 moves horizontally with respect to the cavity member 2 to perform mold closing and mold opening. In the mold closed state, a cavity C of the product is formed straddling the parting line (PL) of both members 2 and 3, and the plunger 6 as an injection member moves forward, so that the molten resin passes through the hot tip 7 to form the cavity C. It is supposed to be injected into.

As a mechanism for guiding the core member 3 in the mold opening / closing direction, neither a die plate nor a tie bar is provided in the present embodiment, and the core member 3 has a mold base 5 as shown in FIG.
It is supported by two guide members 10 arranged above . Each guide member 10 is made of an oil-impregnated metal and has a core.
The member 3 is slid in the mold opening / closing direction, and the core member 3 is placed on these guide members 10. Also,
Guide wall portions 11 are erected on both sides of the core member 3 so as to be in contact with the wall surfaces on both sides of the core member 3, and these guide wall portions 11 extend along the moving direction of the core member 3 as shown in FIG. By being positioned, the core member 3 is guided in the mold opening / closing direction while sliding on the guide wall portions 11 on both sides and the guide member 10 described above.

Next, the drive mechanism for the core member 3 will be described, and then the drive mechanism for the plunger 6 will be described.

The drive source of the drive mechanism for the core member 3 is the electric motor 12 shown in FIG. 1. The rotation of the electric motor 12 is converted into the linear motion of the worm rack 13, and the yoke member 23 and the toggle mechanism, which will be described later, are used. Via 14 etc.
It is adapted to be transmitted to the core member 3. As shown in FIG. 2, the electric motor 12 is disposed on the mold base 5 in vertical form, the rotation of its output shaft 15 is Eject as the rotation of the worm 16 through a speed reduction mechanism as required. The worm 16 is the worm rack 1 installed horizontally.
The worm rack 13 is moved by one pitch by one rotation of the worm 16. The worm rack 13 is supported by a plurality of guide rollers 17, the tip of which is connected to one end of a link 19 via a pin 18, and the pin 18 enters into a long hole 20 formed in the link 19.

The link 19 has a positionally fixed shaft 21 ,
The mold base 5 is rotatably supported in the vertical plane, and the other end of the mold base 5 is connected to a yoke member 23 via a joint member 22. A long hole 34 is formed at the other end of the link 19, a horizontal pin 24 supported by the joint member 22 is inserted into the long hole 34, and a vertical shaft 25 provided in the joint member 22 in the up-down direction. On the other hand, the above-mentioned yoke member 23 is rotatably attached at one end thereof in the horizontal plane.

The yoke member 23 is divided into an upper arm 26 and a lower arm 27 at the tip end side thereof, and these are opposed to each other in the vertical direction. Each arm 26 and 27
As shown in FIG. 1, the first links 28 constituting the toggle mechanism 14 are connected at respective one ends by shafts 29, and the other ends of the respective first links 28 are connected to the mold base 5 by shafts 30. Has been done. In addition, the yoke member 23
The other end of the second link 32, one end of which is connected to the core member 3 by the shaft 31, is connected by the above-mentioned shaft 29.
The second link 32 is also provided in a pair is divided into top and bottom, co
The toggle member 14 is located so as to sandwich the member 3 from above and below, and constitutes the toggle mechanism 14 together with the above-mentioned pair of first links 28.

When the toggle mechanism 14 is positioned as shown by the solid line in FIG. 1, the electric motor 12 shown in FIG. 2 rotates in one direction, and the worm rack 13 moves rightward in the drawing through the worm 16. When it moves forward, the link 19 rotates counterclockwise, and the yoke member 23 retracts via the joint member 22. As a result, the shaft 2 is adjusted so that the angle formed by the toggle mechanism 14 becomes small as shown by the phantom line in FIG.
9 is retracted, and as a result, the core member 3 is moved to the cavity member 2
Move away from. When the electric motor 12 rotates in the opposite direction, the worm rack 13 shown in FIG. 2 retracts to the left in the figure, and the yoke member 23 advances via the link 19. Therefore, the toggle mechanism 14 causes the core portion of FIG.
The material 3 moves to the cavity member 2 side and is pressed against it. This forms the product cavity C.

Next, the drive for the plunger 6 shown in FIG.
The moving mechanism will be described. This drive mechanism also includes, as a drive source, an electric motor 40 that is exactly the same as that of the core member 3, and the electric motor 40 is provided on the die base 5 along with the electric motor 12 described above. In FIG. 3, the configuration in which the rotation of the output shaft 15 of the electric motor 40 is taken out as the rotation of the worm 16 and the configuration in which the worm rack 13 meshing with the worm 16 moves forward and backward are the same as those of the electric motor 12 described above.

The tip of the worm rack 13 is connected to the elongated hole 42 of the link 41 via the pin 18. The link 41 is rotatably supported by the mold base 5 via a shaft 43 in a vertical plane, and the shaft 43 is supported by a bracket 44 fixed to the mold base 5 . A long hole 45 is formed at the other end of the link 41, and a pin 46 inserted into the long hole 45 connects the link 41 to the plunger 6 through a joint member 47. Both ends of the pin 46 have a pair of horizontal guide grooves 53 formed in the bracket 44.
It is slidably inserted in and is guided by the pin 4
6 is moved in the horizontal direction.

The plunger 6 is housed slidably in the axial direction in a tube 48 fixed above the die base 5, and the hot tip 7 is provided at the tip of the tube 48. The hot tip 7 has a heating cylinder and a nozzle integrated with each other, has a heater portion 49 and a nozzle portion 50 formed at the tip thereof, and injects resin directly into the gate of the cavity C in the nozzle portion 50.

A hopper 51 is provided above the tube 48. One shot of resin material (pellet) required for molding one product is put into the hopper 51 from the metering device 52, and this is supplied into the tube 48 with the plunger 6 lowered to the retracted position. . Then, in the state where the plunger 6 is retracted in such a manner, the link 41 is at the position indicated by the phantom line, and the warm rack 13
Is in the forward end position. By rotating in this state the electric motor 40 in one direction, the worm rack 13 is retracted through the worm 16, the link 41 is the plunger 6 is pushed out by rotating counterclockwise, the
The molten resin for one shot is the nozzle part 5 of the hot tip 7.
It is injected from 0 to the cavity C. When the electric motor 40 rotates in the opposite direction, the worm rack 13 moves forward, the link 41 rotates clockwise, and the plunger 6 moves backward, contrary to the above.

The entire injection cycle will be described with reference to FIG. The toggle mechanism 14 is driven by driving the electric motor 12.
The core member 3 is pressed against the cavity member 2 via
This state is maintained by continuously supplying electric power to the electric motor 12. After that, the plunger 6 moves forward by driving the electric motor 40 to inject one shot of molten resin into the cavity C. After a certain short time, the electric motor 40 rotates in the reverse direction to retract the plunger 6, and then the electric motor 12 rotates in the reverse direction to open the toggle mechanism 14 and open the core member 3 in the cavity.
Away from the member 2.

The product molded in the cavity C is as described above.
While attached to Uni core member 3 side, the core member 3 movably ejector member 53 is incorporated in its opening and closing direction, in spaced course of the core member 3, the ejector member 53
By hitting the stopper 54 fixed to the mold base 5 , the product ( C ) is ejected from the core member 3 and drops downward. The product ( C ) does not have extras such as runners, and the material yield is high.

As is clear from the above description, in this embodiment, the mold base 5 is provided with the cavity core members 2 and 3.
The electric motors 12 and 40 and all of the drive mechanism
Due to the built-in and supported structure, it has a built-in drive mechanism.
A very compact mold device 1 is realized and can be carried around
You can also connect it to a power supply on the table
It can also be used easily with a scale. Moreover, the both conductive <br/> dynamic motor 12 and 40 as a drive source, mechanically core
Since the member 3 is driven and the plunger 6 is driven, the energy of the electric motors 12 and 40 directly reaches the movable mold 3 or the plunger 6 as compared with the case where a hydraulic cylinder is used, and energy loss is reduced. Less and more energy efficient.

Further, particularly in this embodiment, the core member 3 is transferred.
In guiding the movement , there is no conventional die plate or tie bar, and the core member 3 is slidably supported by the guide wall portions 11 provided on both sides of the die base 5. Therefore, the space for disposing the core member 3 can be small, and
When the core member 3 is moved , it is not necessary to move an extra heavy object such as a die plate as in the prior art, so the driving force can be small, which also leads to energy saving.

In the above embodiment, the core member 3 is transferred.
Although the toggle mechanism 14 is provided for movement, the core member 3 may be directly connected to a portion corresponding to the yoke member 23, and the cavity member 2 may be provided so as to face the core member 3. Further, in the above embodiments, the electric motor 12 or 4
The rotation of 0 was reduced by the worm mechanism, but the end gear of the reduction mechanism was used as a pinion and the rack was engaged with this, or the rotation of the end gear was converted into a linear motion by the piston crank mechanism. It can also be converted.

[Brief description of drawings]

FIG. 1 is a plan view of an electric injection mold apparatus according to an embodiment of the present invention.

FIG. 2 is a left side view thereof.

FIG. 3 is a right side view thereof.

[Description of Reference Signs] 1 electric injection molding die device 2 cavity member 3 core member 5 mold base 6 plunger (injection member) 10 guide member 11 guide wall portion 12 first electric motor 13 worm rack 14 toggle mechanism 16 worm 19 link 23 yoke member 28 first link 32 second link 40 second electric motor 41 link

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (3)

[Claims] 1. A mold opening / closing guide mechanism for a set of molds, at least one of which is a movable mold, a mold opening / closing drive mechanism for driving the movable mold along the mold opening / closing guide mechanism, and the set of molds. An injection member for injecting the molten resin into a cavity formed in the mold and an injection drive mechanism for moving the injection member forward and backward are provided, and the mold opening / closing drive mechanism includes an electric motor and an electric motor of the electric motor. An electric injection molding machine comprising: a motion conversion mechanism that decelerates rotation and converts the motion into a linear motion; and a connection mechanism that connects the motion conversion mechanism and the movable mold. 2. A mold opening / closing guide mechanism for a set of molds, at least one of which is a movable mold, a mold opening / closing drive mechanism for driving the movable mold along the mold opening / closing guide mechanism, and the set of molds. An injection member for injecting the molten resin into the cavity formed in the mold and an injection drive mechanism for moving the injection member forward and backward are provided, and the injection drive mechanism is an electric motor and rotation of the electric motor. An electric injection molding machine comprising: a motion conversion mechanism that decelerates and converts the motion into a linear motion; and a connection mechanism that connects the motion conversion mechanism and the injection member. 3. A mold opening / closing guide mechanism for at least one movable mold, a mold opening / closing drive mechanism for driving the movable mold along the mold opening / closing guide mechanism, and the set of molds. An injection member for injecting the molten resin into a cavity formed in the mold, and an injection drive mechanism for moving the injection member forward and backward are provided, and the mold opening / closing drive mechanism and the injection drive mechanism are
Each includes an electric motor, a motion conversion mechanism that decelerates the rotation of the electric motor and converts it into a linear motion, and a connection mechanism that connects the motion conversion mechanism and the movable die or the injection member, respectively. An electric injection molding machine characterized in that