JPH10667A - Injection molding machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To simultaneously reduce the size of an injection molding machine and ensure mechanical strength. SOLUTION: A ball screw 12 having a through hole 14 formed in an axial direction is rotatably and axially immovably attached to a central portion of a third platen 5, and a ball nut 10 screwed to the ball screw 12 is provided on the second platen 4. The ball screw 12 is fixedly mounted at the center of the rear surface, and the ball screw 12 is rotated to perform the mold clamping mold opening operation. The mold clamping operation can be performed using the large-diameter ball screw 12 or the ball nut 10 provided at the center of the platens 4 and 5, so that the mechanical strength of the mold clamping mechanism is guaranteed. In addition, the ball screw 12 and the ball nut 10
And the injection cylinder 8 is brought into contact with the sprue of the mold, so that the injection molding machine 1 has a thickness corresponding to the thickness of the mold clamping mechanism 6.
Shorten the overall length of the

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in an injection molding machine.

[0002]

2. Description of the Related Art In a general structure of a horizontal injection molding machine, a platen is arranged in the order of a rear platen, a moving platen, and a stationary platen, and an injection unit is arranged on the back side of the stationary platen to provide a central portion of the stationary platen. Usually, the nozzle of the injection cylinder is protruded from the provided through-hole to make contact with the stationary mold on the surface of the stationary platen.

The basic structure of a vertical injection molding machine is the same as that of the above-described horizontal injection molding machine.
Lower plate fixed upper movable type, where the platen equivalent to the moving platen of the horizontal injection molding machine is fixed as the stationary platen, and the platen equivalent to the stationary platen of the horizontal injection molding machine is moved to be the moving platen, The injection unit is provided upright with a dedicated guide rod provided on a moving platen.

Therefore, the total length of a horizontal injection molding machine or a vertical injection molding machine is at least the length of the tie bar and the length of the injection cylinder plus the length of the injection unit body. Therefore, the installation place of the injection molding machine is greatly restricted.

[0005] As a special construction for compactness, Japanese Patent Application Laid-Open No. Hei 8-57896 discloses a technique in which the entire length of an injection molding machine is shortened by penetrating a mold clamping mechanism and injecting an injection cylinder. Proposed by the applicants. However, in this case, ball screws and ball nuts of the mold clamping mechanism were provided avoiding the vicinity of the injection cylinder that penetrates the rear platen and the stationary platen at the center, so that the ball screw and the ball nut are based on the axis of the injection cylinder. Unless a plurality of components are arranged symmetrically, a stable mold clamping force cannot be obtained, and there is a problem in that the structure becomes complicated.

Further, since the space in which the ball screws, ball nuts and the like are provided is divided by the injection cylinder, each ball screw, ball nut and the like must be reduced in diameter and provided around the injection cylinder. ,
In some cases, it is necessary to omit the crosshead guide rod and the like due to space limitations, and there was concern about mechanical strength.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection molding machine which solves the above-mentioned drawbacks of the prior art, and which can achieve both miniaturization of the apparatus and securing of mechanical strength at the same time. It is in.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a direct pressure type injection molding machine using a ball screw, which is fastened to the first platen via a first platen and a second platen for mounting a mold, and a tie bar. A ball screw having a third platen formed and an injection unit superposed in this order, a through hole formed in the center of the second platen and the third platen, and a through hole formed in the axial direction. One of the ball nuts screwed to the ball screw is rotatably and axially immovably attached to the center of the back surface of the second platen or the center of the third platen, and the other is the center of the surface of the third platen or the other. The injection cylinder of the injection unit located on the back side of the third platen is attached to the third platen and the third platen so that it cannot rotate and cannot move in the axial direction. Second and can come into contact with mold sprue platen surface by penetrating the Runeji and second platen through hole of the ball screw and the first platen and the second by rotating the direction of one of the ball nut capable rotation
The above object has been achieved by a configuration in which a mold clamping die opening operation is performed by relatively moving the platen toward and away from the platen.

Further, in a toggle type injection molding machine using a ball screw and a toggle link, a first mounting die is provided.
A platen, a second platen, a third platen fastened to the first platen via a tie bar, and an injection unit are provided in this order by being overlapped, and a central portion of the second platen and the third platen is penetrated. A hole is formed, a mold clamping mechanism including a toggle link mechanism is provided between the second platen and the third platen, and either a ball screw having a through hole formed in the axial direction or a ball nut screwed into the ball screw is provided. One is attached to the center of the back surface of the second platen or the center of the third platen so as to be rotatable and immovable in the axial direction, while the other is provided integrally with the crosshead of the toggle link mechanism, and is provided on the back side of the third platen. The injection cylinder of the injection unit is passed through the third platen, the ball screw, and the through hole of the second platen, and the sprue of the mold on the surface of the second platen , And the rotatable ball screw or ball nut is rotationally driven to bend and stretch the toggle link mechanism to relatively move the first platen and the second platen relatively to each other to perform a mold clamping mold opening operation. The above object has been achieved by a configuration characterized in that the above is performed.

In any case, a structure is adopted in which a mold clamping mechanism formed between the second platen and the third platen is penetrated so that the injection cylinder abuts on the sprue of the mold. (See, for example, Japanese Patent Application Laid-Open No. 8-57896). Further, since the injection cylinder is made to pass through the ball screw, it is possible to use a large diameter ball screw and ball nut, and the mechanical strength of the mold clamping mechanism is secured.

[0011] At least one of the first platen and the third platen is fixed to a base of the injection molding machine to form a stationary platen, and the second platen is moved as a moving platen. It is possible to adopt any of the configurations in which the stationary platen is fixed to the base and the first and third platens are moved as a moving platen and a rear platen.

In a case where at least one of the first platen and the third platen is fixed to a base of an injection molding machine to form a stationary platen and the second platen is moved as a moving platen, the back surface of the second platen is applied. A guide rod protruding from the second platen is passed through the third platen, and an injection unit is fixed to the tip of the third platen.
Make the injection unit move integrally with the platen,
Further, a means for changing the effective length of the guide rod is provided so that the nozzle touch and the sprue break operation can be performed.

In a case where the second platen is fixed to a base of an injection molding machine to form a stationary platen and the first and third platens are moved as a moving platen and a rear platen, the injection unit may be a second platen. Means for bringing the platen into and out of contact with the platen is provided on the base of the injection molding machine so that the nozzle touch and the sprue break operation can be performed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a vertical injection molding machine 1 according to an embodiment to which the configuration of the present invention is applied. This vertical injection molding machine 1 employs a direct pressure type clamping mechanism using four tie bars 2, and the outer shape of each of a first platen 3, a second platen 4, and a third platen 5 is As
It is formed in a rectangular shape. FIG. 3 is a plan view showing the outer shape of the second platen 4 among them, and the cross-sectional portion shown in FIG. 1 corresponds to a plane taken along line dd in FIG. In FIG. 1, the left part of the vertical axis of the vertical injection molding machine 1 shows the mold open state, and the right side of the central axis shows the clamped state.

The injection molding machine 1 is generally composed of a first
Platen 3, second platen 4, mold clamping mechanism 6, third platen 5, injection unit 7, and four tie bars 2
As shown in FIG. 1, each element is superposed and arranged from bottom to top in the order of the first platen 3, the second platen 4, the mold clamping mechanism 6, the third platen 5, and the injection unit 7. ing.

Since the first platen 3 also serves as a base on which the injection molding machine 1 is mounted, if the respective platens are functionally classified, the first platen 3 is a stationary platen or a stationary platen. The second platen 4 that moves up and down relative to the first platen 3 is a moving platen, and the third platen 5 fastened to the first platen 3 via the tie bar 2 is a rear platen.

As shown in FIG. 1, an injection unit 7 is provided at the center of the second platen 4 on which the movable die (upper die) is mounted.
A through hole 9 for passing the injection cylinder 8 is formed.
A ball nut 10 is fixed to the rear surface (upper surface) of the platen 4 so as not to rotate and not move in the axial direction.

A through hole 11 for passing the injection cylinder 8 is also formed in the center of the third platen 5, and a ball screw 12 screwed with the ball nut 10 is provided in the inner peripheral portion of the bearing 13. And is mounted so as to be rotatable and immovable in the axial direction. As shown in FIG. 1, a through hole 14 having an inner diameter large enough to allow the injection cylinder 8 to pass therethrough is formed inside the ball screw 12 along the central axis. As shown in FIG. 4, the third pulley 15 is integrally fixed with an annular pulley 15.
Mold clamping servo motor 17 fixed to one side of platen 5
, And is rotationally driven via the timing belt 16.

The ball screw 12 is attached to the third platen 5 so as not to rotate and cannot move in the axial direction, while the ball nut 10 is attached to the second platen 4 so as to rotate and cannot move in the axial direction. The rotation may be performed by a mold clamping servomotor 17 fixed to the platen 4 side.

Of course, the ball screw 12 is attached to the second platen 4 so as not to rotate and cannot move in the axial direction, and the ball nut 10 is mounted to the third platen 5 so as to rotate freely and cannot move in the axial direction. The ball nut 10 may be rotatably driven by a mold clamping servomotor 17 fixed to the side 5, or the ball nut 10 may be attached to the third platen 5 so as not to rotate and move in the axial direction.
May be attached to the second platen 4 so as to be rotatable and immovable in the axial direction, and may be driven to rotate by a mold clamping servomotor 17 fixed to the second platen 4 side. There are four types of combinations of the mounting positions of the ball nut 10 and the ball screw 12 and the driving method. In this embodiment, in order to minimize the inertial mass of the second platen 4 that is a movable object, the third object that is a fixed object is used. The mold clamping servomotor 17 and the ball screw 12 are provided on the platen 5 side.

A guide rod 18 for supporting the injection unit 7 is provided upright on the back surface (upper surface) of the second platen 4 via an air cylinder 19 serving as a means for changing the effective length. As shown in FIG. 3, the guide rod 18 and the air cylinder 19
Are arranged along the diagonal line of FIG. 1 in such a manner as to sandwich the ball nut 10, the tip of which extends through the third platen 5 as shown in FIGS. A similar injection unit 7 is integrally fixed.

Accordingly, if the ball screw 12 is rotated via the timing belt 16 and the pulley 15 by driving the mold clamping servo motor 17, the axial direction of the ball screw 12 with respect to the ball nut 10 fixed to the second platen 4 And the second platen 4 moves toward and away from the third platen 5 to open the mold between the first platen 3 serving as a stationary platen and the second platen 4 serving as a moving platen. The operation will be performed. Since the injection unit 7 is integrally fixed to the second platen 4 serving as a moving platen via the guide rod 18, even if the second platen 4 is moved, the movable die (upper die) and the injection cylinder 8 are moved. There is no relative change between the nozzle at the tip and the nozzle, and the nozzle touch state can be maintained.

The two air cylinders 19 are driven synchronously to protrude, the effective length of the guide rod 18 is lengthened, and the nozzle at the tip of the injection cylinder 8 is moved from the sprue of the movable mold (upper mold). By separating, sprue break operation can be performed.

As a means for changing the effective length of the guide rod 18 synchronously, a ball screw and a ball nut mechanism can be applied in addition to the air cylinder 19. More specifically, the ball screw and the ball nut mechanism referred to here are Japanese Patent Application No. 7-9040.
In this embodiment, the pulley 15 and the like are provided between the guide rods 18-18. It is difficult to provide a large diameter gear between the guide rods 18-18, and it is necessary to directly and synchronously drive a ball nut for changing the effective length of the guide rod 18 by a timing belt or the like. Of course, an auxiliary pulley or the like for regulating the path of the timing belt or the like is required so that the timing belt or the like does not interfere with the pulley 15 or the like. Of course, as proposed in Japanese Patent Application No. 7-90402, a ball nut in which a rotor of a motor and a ball nut are integrally formed is used, and this is synchronously driven to change the effective length of the guide rod 18. Is also good.

In the present invention, a ball screw or the like is not provided so as to avoid a portion through which the injection cylinder 8 penetrates as in the prior art, but a set of a ball screw 12 and a ball nut are formed so as to surround the injection cylinder 8 itself. 10 is arranged, a mold clamping force can be applied to the center of the second platen 4 serving as a moving platen in a well-balanced manner, and both the ball screw 12 and the ball nut 10 have large diameters. So you can
The mechanical strength is also improved as compared with the conventional one. Moreover,
The point that the injection cylinder 8 is guided to the sprue of the movable mold (upper mold) through the mold clamping mechanism 6 is disclosed in JP-A-8-57.
It is exactly the same as the injection molding machine of No. 896, and the advantages inherent in the injection molding machine of JP-A-8-57896, such as shortening the total length of the injection molding machine, are directly followed.

Further, by a configuration unique to the present invention in which the injection cylinder 8 is passed through the ball screw 12 and the ball nut 10, a heat insulating layer of air is provided between the outer peripheral surface of the injection cylinder 8 and the inner peripheral surface of the ball screw 12. Is formed, and a secondary effect such that the heat retention of the injection cylinder 8 is increased.

FIG. 5 is a front view showing a vertical injection molding machine 20 according to another embodiment to which the configuration of the present invention is applied. The vertical injection molding machine 20 employs a toggle-type mold clamping mechanism using four tie bars 2 ', and each of a first platen 3', a second platen 4 ', and a third platen 5'. The outer shape is formed in a rectangular shape as a whole, similarly to the case of the injection molding machine 1 of the embodiment described first. FIG. 6 is a plan view showing the outer shape of the second platen 4 ', and the cross-sectional portion shown in FIG. 5 corresponds to the plane taken along line DD in FIG. In FIG. 5, the left side of the center axis shows the mold opening state of the vertical injection molding machine 20, and the right side of the center axis shows the mold clamping state.

The injection molding machine 20 corresponds to the injection molding machine 1 described above.
The only difference is the configuration of the mold clamping mechanism 6 ′ using the toggle link 21. Other parts are completely common to the injection molding machine 1 described above, so Will be indicated by adding “′” to the reference numerals used in the description of FIGS. 1 to 4, and detailed description will be omitted.

Further, in the injection molding machine 20, since the toggle type mold clamping mechanism is employed, the distance between the third platen 5 'and the second platen 4' at the time of completion of mold clamping is univocally determined. Therefore, a mold thickness adjusting mechanism for changing the effective length of the tie bar 2 'is required. This mold thickness adjusting mechanism is housed inside the first platen 3' formed in a hollow box shape. It cannot be seen from the outside because it has been. Regarding the configuration of the mold thickness adjusting mechanism, as described in the section on the adjustment of the effective length of the guide rod 18, the mold thickness adjusting mechanism described in the section of "Prior Art" in Japanese Patent Application No. 7-90402. Mechanisms and Japanese Patent Application No. 7-9040
Since the configuration and the like of the mold thickness adjusting mechanism proposed in No. 2 can be applied as it is, no particular description is given here.

In the case of the injection molding machine 20, as in the case of the injection molding machine 1 of the first embodiment, the first platen 3 'also serves as a base on which the injection molding machine 20 is mounted. The platen 3 'is a stationary platen, the second platen 4' is a moving platen, and the third platen 5 'is a rear platen.

The toggle link 21 of the mold clamping mechanism 6 'has a binary link 22 and a ternary link 2 as in the prior art.
3, and ternary link 23 and crosshead 24
And a crosshead link 25 connecting the two.

As shown in FIG. 5, the crosshead 24 is formed by a main body portion formed of an annular body, and an arm portion for pivotally mounting a crosshead link projecting diametrically on both sides from the main body portion. A ball nut 10 'is integrally fixed to the main body portion. Therefore,
The ball nut 10 'cannot rotate with respect to the crosshead 24 and cannot move in the axial direction.

Further, a penetration section 1 at the center of the third platen 5 '
1 'has a ball screw 12' screwed into the ball nut 10 'of the crosshead 24, as in the above embodiment.
Are mounted via a bearing 13 'so as to be rotatable and axially immovable. As shown in FIG. 5, a through hole 14 'through which the injection cylinder 8' passes is formed along the center axis inside the ball screw 12 ', and an annular outer surface at the upper end portion of the ball screw 12' is formed. The pulley 15 'is integrally fixed and, as shown in FIG. 7, is driven to rotate via a timing belt 16' by a mold clamping servomotor 17 'fixed to one side of the third platen 5'. It has become.

The ball screw 12 'is fixedly mounted on the crosshead 24, and the ball nut 10' is mounted on the third platen 5 'so as to be rotatable and axially immovable. The rotation may be performed by a mold clamping servomotor 17 'fixed on the side.

In this embodiment, the crosshead 24
Moves toward and away from both the second platen 4 'and the third platen 5', and it is also difficult to mount the clamping servomotor 17 'as a drive source directly on the crosshead 24. Therefore, it is difficult to rotatably mount the ball nut 10 ′ or the ball screw 12 ′ on the crosshead 24 side, and to rotate the ball screw 10 ′ or the ball screw 12 ′. However, the ball nut 10 ′ is mounted on the back (upper) side of the second platen 4 ′. ′
And a ball screw 12 'are rotatably mounted, and are rotationally driven by a mold clamping servomotor 17' fixed to the second platen 4 'to rotate the ball screw 12' or the ball nut 1 '.
It is possible to feed the crosshead 24 with the fixed 0 '.

When the ball nut 10 'is rotatably mounted on the side of the second platen 4', a ball screw 12 'projecting toward the second platen 4' is fixed to the crosshead 24. When the ball screw 12 'is rotatably mounted on the second platen 4' side, the ball nut 10 'is fixedly mounted on the crosshead 24 side.

As in the first embodiment, in this embodiment, a guide rod 18 'for supporting the injection unit 7' is provided on the back (upper surface) of the second platen 4 '. It is erected through 19 '. As in the case of the above embodiment, the air cylinder 19 '
Instead, a ball screw and a ball nut mechanism can be adopted.

In this embodiment, as in the case of the second platen 4 in the above-described embodiment, the moving direction of the movable member having the ball nut fixed thereto is not directly regulated by the tie bar. It is necessary to provide the crosshead 24 with a detent and a means for regulating the moving direction of the crosshead 24.
Of course, since the ball screw 12 'itself has a sufficient thickness,
Thus, the linear movement of the crosshead 24 can be maintained, but at least a guide for preventing the rotation of the crosshead 24 is required.

However, in the present embodiment, as shown in FIG. 6, two guide rods 18 'standing on the second platen 4' are connected to the outer peripheral portion of the main body of the crosshead 24 and the ball nut 10 '. Guides the linear movement of the crosshead 24 through the flange portion;
Is prohibited, it is not necessary to provide a dedicated detent means on the crosshead 24 again. The guide rod 18 ′ serves as a means for supporting the injection unit 7 ′ to move integrally with the second platen 4 ′, a linear movement guide for the crosshead 24, and a detent means for the crosshead 24. I have.

Therefore, if the ball screw 12 'is rotated via the timing belt 16' and the pulley 15 'by driving the mold clamping servomotor 17', the crosshead 24
Ball screw 1 for ball nut 10 'fixed to
The crosshead 24 moves toward and away from the third platen 5 ′ by changing the screw position in the axial direction 2 ′, and is driven by the crosshead 24 via the crosshead link 25.
The set of toggle links 21 bends and stretches in synchronization, and a mold clamping mold opening operation is performed between the first platen 3 'serving as a stationary platen and the second platen 4' serving as a moving platen.

As in the case of the first embodiment, the injection unit 7 'is integrally fixed via the guide rod 18' to the second platen 4 'serving as a moving platen. ′ Is moved, the relative position does not change between the movable mold (upper mold) and the nozzle at the tip of the injection cylinder 8 ′, and the nozzle touch state can be maintained. In addition, the two air cylinders 19 'are driven synchronously to protrude, and the guide rods 18'
The sprue break operation can be performed by increasing the effective effective length of the nozzle and separating the nozzle at the tip of the injection cylinder 8 'from the sprue of the movable mold (upper mold). In addition, the same effects as those of the first embodiment can be achieved with respect to improvement of mechanical strength, shortening of the overall length of the injection molding machine, improvement of heat retention of the injection cylinder, and the like.

Next, an example in which the second platen is a stationary platen will be briefly described.

The simplest example is that the outer shape of the first platen 3 of the direct pressure type injection molding machine 1 as shown in FIG. 1 is formed to have the same size as the second platen 4 and the third platen 5. Is laid on the base of the injection molding machine as it is, and the second platen 4 is fixed to the base.

Naturally, when such a configuration is applied, the second platen 4 serving as the stationary platen does not move with respect to the base of the injection molding machine, so that the second platen 4 serving as the stationary platen is not moved. The injection unit 7, which should maintain a constant positional relationship with the injection molding machine, may be directly attached to the base of the injection molding machine, and a guide rod 18 for supporting the injection unit 7 is not required.
However, when the same configuration is applied to the toggle-type injection molding machine 20 as shown in FIG. 5, even though the guide rod 18 'for supporting the injection unit 7' is not necessary, the crosshead is still used. A guide rod is required to guide the 24 linear movements and to prevent them from rotating.

Needless to say, means for bringing the injection units 7, 7 'into and out of contact with the second platens 4, 4' is necessary for the spre break and the nozzle touch operation. In this case, the injection units 7, 4 'are required. The means for moving the 7 'back and forth may be provided on the base side of the injection molding machine as in the case of a conventional general horizontal injection molding machine. In addition, the thing using a ball screw, the thing using a chain drive, etc. are well-known.

As a result, the arrangement of the second platens 4, 4 'serving as a stationary platen, the first platens 3, 3' serving as a moving platen, the third platens 5, 5 'serving as a rear platen, and the injection units 7, 7' are provided. Is exactly the same as the case of the horizontal injection molding machine proposed in JP-A-8-57896,
When the mold clamping mold opening operation is performed by driving 6 ', the first platens 3, 3' are maintained while the second platens 4, 4 'and the injection units 7, 7' are held at fixed positions on the base. And the third platens 5, 5 'slide integrally on the base to form a mold between the second platens 4, 4' serving as stationary platens and the first platens 3, 3 'serving as moving platens. A closing die opening operation will be performed.

As described above, even when the second platen 4, 4 'is fixed on the base to form a horizontal injection molding machine, the mechanical strength can be improved, the overall length of the injection molding machine can be shortened, and the injection cylinder can be reduced. The same effects as in the above-described embodiments can be achieved with respect to the improvement of the heat retention and the like.

If resin leaks from the tip of the nozzle during the sprebreak, it is not desirable that this resin penetrates into the screwing surface between the ball screw 12 and the ball nut 10. Therefore, a direct pressure type horizontal injection molding machine is used. If you design
Although it does not matter which one is rotated, it is better to attach a ball screw 12 on the second platen 4 side and a ball nut 10 on the third platen 5 side, contrary to the example of FIG.

[0049]

According to the present invention, the mold clamping operation can be performed by using a large-diameter ball screw or a ball nut provided at the center of the platen. And the ball nut is penetrated to make contact with the mold sprue on the surface of the second platen, thereby reducing the overall length of the injection molding machine without impairing the strength of the mold clamping mechanism of the injection molding machine. be able to.

Further, as a result of the outer peripheral portion of the injection cylinder being covered by the ball screw and the ball nut, the heat retaining performance of the injection cylinder is also improved, and the temperature of the injection cylinder can be maintained at an appropriate value with less power.

[Brief description of the drawings]

FIG. 1 is a front view showing a vertical injection molding machine according to an embodiment of the present invention (a main portion is shown in cross section).

FIG. 2 is a bottom view showing a second platen of the vertical injection molding machine of the embodiment (as viewed in the direction of arrows aa in FIG. 1).

FIG. 3 is a plan view showing a second platen of the vertical injection molding machine of the embodiment (as viewed in the direction of arrows bb in FIG. 1).

FIG. 4 is a plan view showing a third platen of the vertical injection molding machine of the embodiment (see the arrow cc in FIG. 1).

FIG. 5 is a front view showing a vertical injection molding machine of another embodiment (a main part is shown in cross section).

FIG. 6 is a plan view showing a second platen of the vertical injection molding machine of the embodiment (viewed along the line AA in FIG. 5).

FIG. 7 is a plan view showing a third platen of the vertical injection molding machine of the embodiment (as viewed in the direction of arrows BB in FIG. 5).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical injection molding machine 2, 2 'Tie bar 3, 3' First platen (stationary platen) 4, 4 'Second platen (moving platen) 5, 5' Third platen (rear platen) 6, 6 'Mold clamping mechanism Part 7, 7 'Injection unit 8, 8' Injection cylinder 9, 9 'Through hole 10, 10' Ball nut 11, 11 'Through hole 12, 12' Ball screw 13, 13 'Bearing 14, 14' Through hole 15, 15 'Pulley 16, 16' Timing belt 17, 17 'Servo motor for clamping 18, 18' Guide rod 19, 19 'Air cylinder 20 Vertical injection molding machine 21 Toggle link 22 Binary link 23 Ternery link 24 Cross head 25 Cross Head link

Claims (7)

[Claims] 1. A first platen and a second platen for mounting a mold, a third platen fastened to the first platen via a tie bar, and an injection unit are provided in this order by being superimposed on each other. A through-hole is formed in the center of the second platen and the third platen, and one of a ball screw having a through-hole formed in the axial direction and a ball nut screwed into the ball screw is connected to the center of the rear surface of the second platen or A third platen is attached to a central portion of the third platen so as to be rotatable and axially immovable, while the other is attached to a remaining central portion of the front surface of the third platen or a central portion of the back surface of the second platen so as not to rotate and axially move. The injection cylinder of the injection unit located on the back side of the third platen, the ball screw and the second
The first platen and the second platen are rotated by driving the rotatable one of the ball screws and the ball nuts so that the first platen and the second platen can rotate relative to each other. An injection molding machine characterized in that the mold clamping mold opening operation is performed by moving the mold in and out. 2. A first platen and a second platen on which a mold is mounted, a third platen fastened to the first platen via a tie bar, and an injection unit are provided in this order by being overlapped. A ball screw having a through hole formed in the center of the second and third platens, a mold clamping mechanism including a toggle link mechanism provided between the second platen and the third platen, and a through hole formed in the axial direction. And one of the ball nuts screwed to the ball screw is rotatably and axially immovably mounted on the center of the back surface of the second platen or the center of the third platen, and the other is connected to the crosshead of the toggle link mechanism. The injection cylinder of the injection unit located on the back side of the third platen is integrated with the third platen, the ball screw and the second
The first platen and the second platen are bent by extending the toggle link mechanism by rotating the rotatable ball screw or ball nut so as to be able to abut the mold sprue on the surface of the second platen by passing through the through hole of the platen. An injection molding machine characterized in that the platen is relatively moved toward and away from the platen to perform a mold clamping die opening operation. 3. A stationary platen, wherein at least one of the first platen and the third platen is fixed to a base of an injection molding machine, and the second platen is moved as a moving platen. The injection molding machine according to claim 1 or 2. 4. A guide rod projecting from the rear surface of the second platen is penetrated through the third platen, and the injection unit is fixed to the tip of the third platen, so that the injection is integrated with the second platen. The injection molding machine according to claim 3, wherein the unit is moved. 5. An injection molding machine according to claim 4, wherein means for changing the effective length of said guide rod is provided so as to perform a nozzle touch and a sprue break operation. 6. A stationary platen, wherein the second platen is fixed to a base of an injection molding machine, and the first and third platens are moved as a moving platen and a rear platen. The injection molding machine according to claim 1 or 2. 7. The injection apparatus according to claim 6, wherein means for bringing the injection unit into and out of contact with the second platen is provided on a base of the injection molding machine so as to perform a nozzle touch and a sprue break operation. Molding machine.