JPH09201855A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an injection molding machine enhanced in the programming workability of molds without damaging the degree of parallelization of mutual molds and not specified in the taking-out direction of a molded product. SOLUTION: This injection molding machine 30 has a tie bar 38 supported on a movable plate 33 at its one end 38a and protruding toward a fixed plate 32 on the side of its other end 38b and spaced apart from the fixed plate at its other end 38b at a time of mold opening and connected to the fixed plate 32 at its other end 38b at a time of mold clamping and a lock means 39 fixing the other end 38b connected to the fixed plate 32 to the fixed plate 32 at a time of mold clamping to fix the movable plate 33 and the fixed plate 32. By this constitution, the programming workability of molds is enhanced and the taking-out direction of a molded product is not specified. Since the other end of the tie bar 38 is strongly connected and fixed to the fixed plate 32 in a mold clamped state by the lock means, the degree of parallelization of mutual molds is not damaged.

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 for molding resin products.

[0002]

2. Description of the Related Art FIG. 10 shows a toggle type injection molding machine 1. The injection molding machine 1 includes a pair of fixed plates 3 and 4 fixed on a base 2 at a predetermined interval, and a movable plate 5 movably arranged between the fixed plates 3 and 4. There is. Between the pair of fixed plates 3 and 4, four tie bars 6 and 6 (however,
Two tie bars are shown in the drawing), and the four corners are connected and fixed to each other. Also,
These tie bars 6 penetrate the movable plate 5 and movably support the movable plate 5 between the fixed plates 3 and 4.

A fixed die 7 is fixed to the movable plate 5 side of one fixed plate 3, and a movable die 8 is fixed to the movable plate 5 so as to face the fixed mold 7. Further, between the movable plate 5 and the other fixed mold 4, the movable plate 5 is brought into contact with and separated from the one fixed plate 3 side to open and close between the movable mold 8 and the fixed mold 7, and A mold opening / closing / clamping mechanism 9 for bringing the fixed mold 7 into close contact with and abutting on the fixed mold 7 is provided.

The mold opening / closing / clamping mechanism 9 includes the other fixed platen 4
A toggle link 10 whose one end is rotatably connected to the other end, and a toggle link 11 whose one end is rotatably connected to the other end of the toggle ring 10 and whose other end is rotatably connected to the movable plate 5. , A hydraulic cylinder 12 connected to the connecting portion of the toggle links 10 and 11.

Then, as shown in FIG. 10, with the rod of the hydraulic cylinder 12 protruding and the toggle links 10 and 11 bent, the movable platen 5 is separated from one fixed platen 3,
A space between the movable mold 8 and the fixed mold 7 is opened. Further, as shown in FIG. 11A, when the rod of the hydraulic cylinder 12 is inserted into the cylinder, the toggle rings 10 and 11 become substantially straight and the movable platen 5 moves to the fixed platen 4 side to move. Type 8
The space between the fixed mold 7 and the fixed mold 7 is closed. In this case, when the movable die 8 and the fixed die 7 are closed, the toggle links 10 and 11 are not perfectly straight as shown in FIG. There is.

Further, as shown in FIG. 11 (c), since the toggle links 10 and 11 are straight, the movable die 8
Is pressed against the fixed mold 7 to perform the mold clamping operation.

In this injection molding machine 1, the fixed plates 3 and 4 are 4
Since the tie bar 6 firmly connects and fixes the movable platen 5 by the tie bar 6, the movable platen 5 is fixed to the movable platen 8 even if the movable platen 5 is pressed against the fixed platen 3 during mold clamping. The parallelism with the mold 7 is not impaired, and the movable mold 8 and the fixed mold 7 are not damaged.

As a type other than the toggle type, a direct pressure type injection molding machine 13 shown in FIG. 12 has been proposed.
In this injection molding machine 13, a fixed platen 14 and a cylinder plate 16 of a hydraulic cylinder 15 for mold opening / closing / clamping are connected and fixed by four tie bars 17, and are moved to the tip of a ram 18 for mold clamping. The plate 19 is fixed. A fixed die 20 is fixed to the fixed platen 14, and a movable die 21 is fixed to the movable plate 19 so as to face the fixed die 20.

The ram 18 projects from the inside of the cylinder 15 to close the space between the movable die 21 and the fixed die 20, and the ram 18 further projects from the inside of the cylinder 15 to fix the movable die 21. The mold 20 is brought into close contact with and abuts on the mold 20 to perform mold clamping.

Also in this injection molding machine 13, the fixed platen 1
4 and the cylinder plate 16 are firmly connected and fixed by a tie bar 17, so that the movable mold 2
The parallelism between 1 and the fixed die 20 is not impaired, and the movable die 21 and the fixed die 20 are not damaged.

[0011]

However, in the above injection molding machines 1 and 13, since the tie bars 6 and 17 are provided around the movable mold and the fixed mold, the movable molds 8 and 21 and the fixed mold 7, During setup work such as installation and removal of 20, the tie bars 6 and 17 interfere with the workability. Further, since the setup work is performed while avoiding the tie bars 6 and 17, the setup work takes time.

Further, even when the product is taken out from the movable mold, it is not possible to shorten the time of the molding cycle because the taking-out direction of the molded product is restricted because the tie bars 6 and 17 are taken out.

As a solution to this, a tie barless type injection molding machine 22 as shown in FIG. 13 has been proposed. This injection molding machine 22 has fixed plate portions 23, 24 on both sides.
The movable platen 26 is arranged inside the block 25 having a concave cross section in which the movable platen 26 is fixed to the other fixed platen 23 by a hydraulic cylinder 27 fixed to one fixed platen portion 24.
It can be freely moved in and out of. A movable die 28 is fixed to the movable board 26, and a fixed die 29 is fixed to the fixed board 23.

In this injection molding machine 22, since the tie bar is not provided around the movable die 28 and the fixed die 29, there is no obstacle during the setup work of the mold, and the setup workability is improved. Further, even when the molded product is taken out, the taking-out direction is not restricted, and the molding cycle time can be shortened.

However, in this injection molding machine 22,
When the movable platen 26 is pressed to the side of the fixed platen 23 at the time of mold clamping, the fixed platen portions 23 and 24 are easily bent outward, and the fixed platen portion 2
When 3 and 24 bend outward, the parallelism between the movable die 28 and the fixed die 29 is impaired. If the molds are clamped in this state, the movable molds 28, 29 may be biased, and the movable molds 28, the fixed molds 29 may be damaged.

In view of the above circumstances, the present invention can improve the setup workability of the mold without impairing the parallelism between the molds, and the direction of taking out the molded product is restricted. Not intended to provide an injection molding machine.

[0017]

In order to achieve the above-mentioned object, the invention according to claim 1 is a fixing plate fixed on a base,
A movable plate, which is arranged so as to come in contact with and separate from the fixed plate, a fixed mold which is fixed to the fixed plate so as to face the movable plate, and a movable mold which is fixed to the movable plate so as to face the fixed plate. A mold opening / closing drive means for bringing the movable plate into and out of contact with the fixed plate to open and close between the movable mold and the fixed mold; and pressing the movable mold toward the fixed mold to bring the movable mold into close contact with the fixed mold. An injection molding machine equipped with a mold clamping mechanism, one end of which is supported by a movable plate and the other end of which protrudes toward the fixed plate side, and when the mold is opened, the other end is separated from the fixed plate and the mold is closed. And a lock means for fixing the movable plate and the fixed plate by fixing the other end connected to the fixed plate to the fixed plate when the mold is closed. .

In this injection molding machine, the other end of the tie bar is separated from the fixed plate when the mold is opened, so that the tie bar is retracted from the periphery between the fixed plate and the movable plate, that is, between the movable mold and the fixed mold. . Accordingly, the tie bar does not get in the way during the setup work of the movable type and the fixed type, and the workability is improved.

When the mold is closed, the other end of the tie bar is fixed to the fixed plate by the locking means, so that the fixed plate and the movable plate are firmly connected and fixed. Accordingly, the parallelism between the movable mold and the fixed mold is not impaired by the mold clamping force.

The invention according to claim 2 is the invention according to claim 1, wherein the fixed plate has an insertion hole, and the other end of the tie bar is inserted and connected in the insertion hole in a mold closed state. It is characterized by

In this injection molding machine, when the movable mold is moved to one fixed mold side by the mold opening / closing drive means and the mold is closed, the other end of the tie bar is inserted into the insertion hole of the fixed plate and connected. , Locked by locking means.

The invention according to claim 3 is the invention according to claim 1 or claim 2, wherein the locking means is supported by a lock groove provided at the other end of the tie bar and a stationary platen and is a mold. A lock piece that engages with the lock groove at the time of closing and fixes the other end of the tie bar to the fixed plate, and this lock piece is moved toward the lock groove side when the mold is closed and engaged therewith, and the lock groove and the lock are opened when the mold is opened. Drive means for releasing the engagement state with the one piece.

In this injection molding machine, when the other end of the tie bar is connected to the fixed plate in the mold closed state, the lock piece driven by the driving means engages with the lock groove of the tie bar to fix the other end of the tie bar. Secure to the board. Further, when releasing the movable die and the fixed die, the movable platen is separated from the fixed platen after releasing the engagement state of the lock piece with the lock groove, and the movable platen and the fixed die are separated from each other. Make it open.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a simple attachment / detachment jig detachably supports one end of the tie bar on a movable plate. It is characterized by having.

In this injection molding machine, the tie bar is completely removed from between the movable mold and the fixed mold by removing the simple attaching / detaching jig and removing the tie bar from the movable plate in the mold open state, and the setup work of the mold is performed. Sex is improved.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the tie bar is moved in a direction away from a stationary plate when the mold is opened. And a tie bar retreating means for retreating from the movable take-out work area.

In this injection molding machine, the tie bar is retracted from the work area for taking out the fixed mold and the movable mold by the tie bar retracting means in the mold open state, whereby the workability of the mold setup is further improved.

The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the mold clamping mechanism is built in the movable plate.

In this injection molding machine, since the mold clamping mechanism is built in the movable plate, the overall length of the injection molding machine along the moving direction of the movable plate is shortened, and the entire size is reduced.

[0030]

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

First Embodiment FIGS. 1A and 1B show an injection molding machine 30 of a first embodiment. In these drawings, the injection molding machine 30 has a base 31.
A fixed platen 32 fixed on the upper side, a movable platen 33 arranged so as to come in contact with and separated from the fixed platen 32, and the movable platen 3
3, a fixed die 34 fixed to the fixed board 32 is provided, and a movable die 35 fixed to the movable board 33 is provided so as to face the fixed die 34. In addition, the injection molding machine 30 includes a mold opening / closing driving unit 36 that opens and closes between the movable mold 35 and the fixed mold 34 by bringing the movable plate 33 into and out of contact with the fixed plate 32, and the movable mold 35 with the fixed mold 34. And a mold clamping mechanism 37 that presses the movable mold 35 toward the fixed mold 34 by pressing it toward the fixed mold 34.

Further, in the injection molding machine 30 of the present embodiment, one end 38a is supported by the movable plate 33 and the other end is projected toward the fixed plate 32 side, and the other end 38b is removed from the fixed plate 32 when the mold is opened. A tie bar 38 which is separated and whose other end is connected to the fixed plate 32 when the mold is closed, and a movable plate 33 and a fixed plate 32 which are fixed to the fixed plate 32 at the other end which is connected to the fixed plate 32 when the mold is closed.
And a locking means 39 for fixing and.

The fixed board 32 is erected and fixed on one side of a flat base 31. The fixed mold 34 described above is fixed to the movable plate 33 side (inside) of the fixed plate 32. Further, insertion holes 40 through which the other ends 38b of the tie bars 38 are inserted are formed at the four corners of the fixed platen 32, respectively. Further, on the opposite side (outside) from the fixed die 34 of the fixed platen 32.
Is provided with an L-shaped lock piece 41. As shown in FIGS. 2 and 3, the lock piece 41 is fixed to the fixed plate 32.
It is fixed to the rod tip of the air cylinder 42 fixed to. Further, a U-shaped notch 43 is formed in the lock piece 41. Into the notch 43, the lock groove 44 at the tip of the other end 38b of the tie bar 38 is inserted.

When the other end of the tie bar 38 is inserted into the insertion hole 40, the lock piece 41 is moved by the driving force of the air cylinder 42 as shown in FIG.
The lock groove 44 and the notch 43 are engaged with each other. This allows
The other end of the tie bar 38 is connected to the fixed plate 32, and the fixed plate 3
2 and the movable plate 33 are firmly connected and fixed by the tie bar 38.

Here, the lock means 39 is supported by the lock groove 44 at the other end of the tie bar 38 and the fixed platen 32 and engages with the lock groove 44 when the mold is closed to fix the other end of the tie bar 38 to the fixed platen. The lock piece 41 fixed to 32 and the lock piece 41 are moved to the lock groove side when the mold is closed to be engaged, and the lock groove 44 and the lock piece 41 are opened when the mold is opened.
And the air cylinder 42 for releasing the engagement state with.

The movable plate 33 includes a mold clamping cylinder portion 46 slidably mounted on a rail 45 installed on the base 31, and a movable plate portion slidably mounted on the rail 45. 47 and an ejecting mechanism portion 48 provided between the mold clamping cylinder portion 46 and the moving plate portion 47. The eject mechanism section 48 is connected to the mold clamping cylinder section 46 by a simple tie bar 64.

One ends 38a of four tie bars 38 are inserted into the mold clamping cylinder portion 46, and the nut 4 is attached to the tip end portion thereof.
9 is screwed. Further, the side of the eject mechanism 48 of the tie bar 38 is fixed by a simple attachment / detachment jig 50. As shown in FIG. 4, in the simple attachment / detachment jig 50, a part of the annular block in the circumferential direction is cut, and the cut portions are connected by bolts 50a. The tie bar 38 is inserted into this block, and the bolt 50a is tightened, whereby the inner diameter of the block is narrowed and fixed to the tie bar 38.

Then, the tie bar 38 is supported by the mold clamping cylinder part 46 by clamping the nut 49 and the simple attaching / detaching jig 50 by clamping the nut 49. In this case, the tie bar 38 is fixed to the fixing plate 3 by loosening the simple attachment / detachment jig 50.
It can be pulled out to the opposite side of 2.

Guides 51 are provided below the mold clamping cylinder portion 46 and the moving plate portion 47. These guides 51, 51 are mounted on a rail 45 fixed on the base 31. As a result, the mold clamping cylinder portion 46 and the moving plate portion 47 can move in and out of contact with the fixed platen 32. Further, the guide 51 of the mold clamping cylinder portion 46 is connected to the rod tip of an air cylinder 52 as a mold opening / closing driving means. The air cylinder 52 is fixed to the bottom surface type of the base 31.

When the movable die 35 and the fixed die 34 are open, the other end 38b of the tie bar 38 is separated from the fixed die 34, as shown in FIG. 1 (a). When the movable die 35 and the fixed die 34 are in the closed state, the other end 38 of the tie bar 38, as shown in FIG.
The b side is inserted into the insertion hole 40 of the fixed plate 32, the tip portion thereof protrudes to the outside of the fixed plate 32, and is connected and fixed by the locking means 39. From this state, the movable mold 35 is pressed and brought into contact with the fixed mold 34 by the mold clamping mechanism 37. FIG.
Reference numeral 65 shown in (a) and (b) indicates a stopper that determines the position of the movable platen 33.

The mold clamping mechanism 37, as shown in FIG. 5, is a cylinder 53 formed inside the mold clamping cylinder portion 46.
And a rod portion 54 protruding toward the ejector mechanism portion 48. Air supply ports 55, 55 are formed in the cylinder 53, and by supplying compressed air into the cylinder 53, the rod portion 54 projects and the eject mechanism portion 48 is pressed toward the fixed mold 34 side.

As shown in FIGS. 6 and 7, the eject mechanism portion 48 urges the eject pin 56 slidably accommodated in the moving plate portion 47 and the eject pin 56 toward the mold clamping cylinder portion 46 side. Compression coil spring 57
And an eject cam 58 that abuts and slides on the mold clamping cylinder portion 46 side of the eject pin 56, and an eject cylinder 59 that moves the eject cam 58 up and down. The eject cam 58 is formed such that the upper end side is thick and the lower end side is thin, and the cam surface 58a is gradually thinned from the upper end to the lower end side.

Then, as shown in FIG. 6, when the eject cam 58 is located above, the eject pin 56 is removed.
Is accommodated in the moving plate portion 47 by the urging force of the compression coil spring 57. Further, when the eject cam 58 moves downward, the eject pin 56 is pressed by the cam surface 58 a and resists the biasing force of the compression coil spring 57 to project from the inside of the moving plate portion 47 into the inside of the movable die 35. When the eject pin 56 projects into the movable die 35, the molded product that is in close contact with the inside of the movable die 35 is pushed out from the inside of the movable die 35.

Next, the operation of the injection molding machine 30 will be described.

In the fixed position state shown in FIG. 1A, the fixed mold 34 and the movable mold 35 are separated from each other, and the movable mold 35 and the fixed mold 34 are separated from each other. Also, one end 3 of the tie bar 38
8a is supported by a movable plate 33, and the other end 38b is fixed plate 32.
Away from From this state, when the air cylinder 52 operates, the movable platen 33 moves to the fixed platen 32 side, and the movable die 3
5 contacts the fixed mold 34, the other end 38b of the tie bar 38 is inserted into the insertion hole 40 of the fixed plate 32, and the tip portion thereof protrudes to the outside of the fixed plate 32.
Are linked.

Next, the air cylinder 42 operates to move the lock piece 41, insert the tip of the tie bar 38 into the notch 43, and bring the lock groove 44 and the notch 43 into the engaged state. As a result, the movable platen 33 and the fixed platen 32 are connected.
Fixed.

The mold clamping mechanism 37 operates with the movable platen 33 and the fixed platen 32 connected and fixed. That is, by supplying air from the air supply port 55 of the mold clamping cylinder portion 46 into the cylinder 53 and pressing the eject mechanism portion 48 toward the fixed platen 32 side, the movable plate portion 47 is pressed and the movable die 3 is pressed.
5 is brought into close contact with the fixed mold 34. As a result, the mold clamping operation is performed.

In this state, a predetermined amount of melted resin is press-fitted between the movable mold 35 and the fixed mold 34 by a resin supply device (not shown). Next, the compressed air is extracted from the inside of the cylinder 53 to release the mold clamping operation. And the air cylinder 5
2 is operated to separate the movable platen 33 from the fixed platen 32, and the movable die 35 and the fixed die 34 are opened.
From this state, the ejector cylinder 59 is operated to lower the ejector cam 58. When the ejector cam 58 is lowered, the ejector pin 56 projects from the moving plate portion 47 into the movable die 35 against the urging force of the compression coil spring 57 on the cam surface 58a. As a result, the molded product that is in close contact with the inside of the movable die 35 is extruded from the inside of the movable die 35.

Next, when exchanging the movable die 35 and the fixed die 34 with other ones, the simple attaching / detaching jig 50 is loosened, and the tie bars 38, 38 are pulled out to the side opposite to the fixed plate 32, and the die is Is taken out of the take-out area (between the fixed die 30 and the moving plate portion 47). Then, after exchanging the movable mold 35 and the fixed mold 34 with other molds, the tie bar 38 is again inserted into the fixed plate 32 side and fixed to the mold clamping cylinder portion 46 of the movable plate 33 by the simple attachment / detachment jig 50. . At this time, the other end 38b of the tie bar 38 is separated from the fixed platen 32.

According to the injection molding machine 30 of the present embodiment, the other end 38b of the tie bar 38 is separated from the fixed platen 32, and the tie bar 38 is retracted from the mold take-out work area by pulling out from the movable platen 33. Therefore, the tie bar 38 does not get in the way during the die replacement work, and the setup workability is improved. In addition, since the movable plate 33 and the fixed plate 32 are firmly connected and fixed by the tie bar 38 during the mold clamping operation, the movable mold 35 and the fixed mold 3 are fixed even if the mold clamping force is applied.
The parallelism with 4 is not impaired. Therefore, the setup workability of the molds can be improved without impairing the parallelism between the molds.

Further, in the injection molding machine 30 of the present embodiment, the mold clamping mechanism 37 is incorporated in the movable platen 33, so that the total length from the fixed platen 32 to the movable platen 33 can be shortened and the apparatus can be made compact. Can be achieved.

Further, in the injection molding machine 30 of this embodiment, since the cylinder diameter can be increased by providing the cylinder 53 in the mold clamping cylinder portion 46, a large force can be generated even by the air cylinder. Therefore, the force for clamping the mold can be generated without using a hydraulic cylinder, so a pressurizing device using hydraulic pressure (a hydraulic cylinder, a hydraulic pump, etc.) is not required, and there is no risk of oil leakage, and a clean Can be realized.

Second Embodiment Next, an injection molding machine 60 of a second embodiment shown in FIGS. 8 and 9 will be described. The same components as those of the injection molding machine 30 according to the first embodiment described above are designated by the same reference numerals in the drawings, and duplicate description will be omitted.

The injection molding machine 60 of this embodiment is the first
With respect to the injection molding machine 30 of the above embodiment, when the mold is opened, the tie bar 38 is automatically pulled out from the movable plate 33 to move the movable mold 35.
It has a tie bar retracting means 63 for retracting the tie bar 38 from between the fixed mold 34 and the fixed mold 34.

As shown in FIGS. 8 and 9, the tip of the upper tie bar 38 whose one end 38a is supported by the movable plate 33 is connected to the rod 62 of the retracting cylinder 62 via the connecting plate 61.
a. The retracting cylinder 62 is supported by the cylinder portion 46 of the movable platen 33.

When the movable die 35 and the fixed die 34 are separated from each other, the retracting cylinder 62 is operated to move the upper tie bar 38 to the movable die 35 and the fixed die 34.
Evacuate from between. As a result, when the molded product that is in close contact with the movable mold 35 is taken out, the tie bar 38 is not provided in the upper portion between the movable mold 35 and the fixed mold 34, so that the work of taking out the molded product is facilitated. Further, since the work of taking out the molded product becomes easy, the time for taking out the molded product can be shortened and the molding cycle can be shortened. Therefore, the cost of the molded product can be reduced.

Further, even when the movable die 35 and the fixed die 34 are exchanged, the tie bar 38 on the upper side is moved to the movable die 35 and the fixed die 3.
4, the movable die 35 and the fixed die 34 can be easily removed or installed, and the setup workability is improved.

In this embodiment, the tie bar 38 on the upper side is used.
Only the movable die 35 and the fixed die 34 are retracted from each other, but all four tie bars 38 may be retracted from the movable die 35 and the fixed die 34.

[0059]

As described above, according to the first aspect of the invention, the other end of the tie bar is separated from the fixed plate when the mold is opened, so that the fixed plate and the movable plate, that is, the movable mold and the fixed mold are separated from each other. The tie bar retracts from the area between and. Accordingly, the tie bar does not get in the way during the setup work of the movable type and the fixed type, and the workability is improved. When the mold is closed, the other end of the tie bar is fixed to the fixed plate by the locking means, so that the fixed plate and the movable plate are firmly connected and fixed. As a result, the mold clamping force does not impair the parallelism between the movable mold and the fixed mold.

According to the second aspect of the present invention, when the movable mold is moved to one of the fixed molds by the mold opening / closing drive means and the mold is closed, the other end of the tie bar is inserted into the through hole of the fixed plate. Since the movable platen and the fixed platen are firmly connected and fixed, the movable platen and the fixed platen are firmly connected and fixed.

According to the invention of claim 3, in the mold closed state,
When the other end of the tie bar is connected to the fixed plate, the lock piece driven by the driving means engages with the lock groove of the tie bar to fix the other end of the tie bar to the fixed plate, so that the movable plate and the fixed plate are strong. It is connected and fixed to. Further, when releasing the movable die and the fixed die, the movable platen is separated from the fixed platen after releasing the engagement state of the lock piece with the lock groove, and the movable platen and the fixed die are separated from each other. The open state facilitates the work of exchanging the mold and the work of taking out the molded product from the movable mold.

According to the invention of claim 4, in the mold open state,
By removing the tie bar from the movable plate, the tie bar is completely removed from between the movable die and the fixed die, and the workability of setting up the die is further improved.

According to the invention of claim 5, in the mold open state,
By retracting the tie bar from the work area for taking out the fixed die and the movable die by the tie bar retreating means, the workability of setting up the die is further improved.

According to the sixth aspect of the invention, since the mold clamping mechanism is built in the movable plate, the overall length of the injection molding machine along the moving direction of the movable plate is shortened, and the overall size can be reduced. It will be possible.

[Brief description of drawings]

FIG. 1 shows a first form of an injection molding machine according to the present invention,
(A) is a side view showing a mold open state, and (b) is a side view showing a mold closed state.

FIG. 2 is a cross-sectional view showing a state where the other end of the tie bar is connected and fixed to a fixing plate.

FIG. 3 is a perspective view showing a state where the other end of the tie bar is inserted into an insertion hole of a fixed plate.

FIG. 4 is a perspective view showing a simple attachment / detachment jig for fixing a tie bar to a movable plate.

FIG. 5 is a sectional view showing a mold clamping mechanism built in a movable plate.

FIG. 6 is a cross-sectional view showing the ejector mechanism portion and showing a state before the eject pin protrudes into the movable mold.

FIG. 7 is a cross-sectional view showing an ejector mechanism portion and showing a state in which an ejector pin projects into a movable mold.

FIG. 8 is a side view showing the injection molding machine of the second embodiment, showing a state before the tie bar is retracted from between the movable mold and the fixed mold.

FIG. 9 is a side view showing the injection molding machine of the second embodiment, showing a state in which the tie bar is retracted from between the movable die and the fixed die.

FIG. 10 is a side view showing a toggle type injection molding machine.

FIG. 11 shows a toggle type injection molding machine, (a) is a side view showing a mold closed state, (b) is a side view showing a state before a mold clamping operation, and (c) is a mold clamping operation completed. It is a side view which shows a state.

FIG. 12 is a cross-sectional view showing a direct pressure injection molding machine.

FIG. 13 is a side view showing a tie barless injection molding machine.

[Explanation of symbols]

 30, 60 Injection molding machine 31 Base 32 Fixed plate 33 Movable plate 34 Fixed type 35 Movable type 36 Mold opening / closing drive means 37 Mold clamping mechanism 38 Tie bar 38a One end 38b Other end 39 Locking means 40 Insertion hole 41 Locking piece 44 Locking groove 50 Simple detaching jig 62 Retracting cylinder

Claims (6)

[Claims] 1. A fixed plate fixed on a base, a movable plate arranged so as to come into contact with and separated from the fixed plate, and a fixed mold fixed to the fixed plate so as to face the movable plate. A movable mold which is fixed to a movable plate so as to face the fixed mold; a mold opening / closing drive means which opens and closes between the movable mold and the fixed mold by bringing the movable plate into and out of contact with the fixed plate; An injection molding machine having a mold clamping mechanism that presses the movable mold toward the fixed mold to bring the movable mold into close contact with the fixed mold, one end of which is supported by the movable plate and the other end of which is projected toward the fixed plate side. At the same time, the other end is separated from the fixed plate when the mold is opened, and the other end is connected to the fixed plate when the mold is closed, and the other end connected to the fixed plate when the mold is closed is fixed to the fixed plate to form a movable plate. An injection molding machine, comprising: locking means for fixing a fixed platen. 2. The invention according to claim 1, wherein the fixed plate has an insertion hole, and the other end of the tie bar is inserted and connected into the insertion hole in a mold closed state. Injection molding machine. 3. The invention according to claim 1 or 2, wherein the lock means is provided in a lock groove provided at the other end of the tie bar, and is supported by a stationary plate to be provided in the lock groove when the mold is closed. A lock piece that engages and fixes the other end of the tie bar to the fixed plate, and this lock piece is moved to the lock groove side when the mold is closed and engaged, and the lock groove and the lock piece are engaged when the mold is opened. An injection molding machine comprising: 4. The invention according to claim 1, further comprising a simple attaching / detaching jig that detachably supports one end of the tie bar with respect to a movable plate. Injection molding machine. 5. The invention according to claim 1, wherein when the mold is opened, the tie bar is moved in a direction in which the tie bar is separated from the fixed platen, and the fixed mold and the movable mold are taken out. An injection molding machine having tie bar retracting means for retracting from a work area. 6. The injection molding machine according to any one of claims 1 to 5, wherein the mold clamping mechanism is built in the movable plate.