JP2003071846A - Mold clamping device of molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detach an adjusting nut and a tie bar without detaching a drive source for mold clamping and a timing gear to easily perform work for inspecting or repairing the adjusting nut and the tie bar without spending time. SOLUTION: The mold clamping device of the molding machine has a guide member having a screw formed to the end part thereof, a mold clamping mechanism support member equipped with a guide member insertion member, the adjusting nut 15 threaded with the screw of the guide member on the back surface side of the mold clamping mechanism support member, the nut rotating gear 21 attached to the end on the back surface side of the adjusting nut 15, the timing gear 23 attached to the back surface of the mold clamping mechanism support member to be meshed with the nut rotating gear 21, and the press plate 16 attached to the back surface of the mold clamping mechanism support member to press the nut 15 so as to be positioned outside the outer periphery of the timing gear 23 as a whole between the nut rotating gear 21 and the back surface of the mold clamping mechanism support member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device for a molding machine.

[0002]

2. Description of the Related Art Conventionally, in a molding machine such as an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill a cavity space of a mold device, A molded product is molded by cooling and solidifying the resin in the space.

To this end, the mold device is composed of a fixed mold and a movable mold, and the mold clamping device moves the movable mold forward and backward to bring the movable mold into and out of contact with the fixed mold to open and close the mold. , Mold closing, mold clamping and mold opening can be performed. Then, the mold clamping device generally has a fixed platen holding a fixed mold and a movable platen holding a movable mold, and a toggle mechanism as an opening / closing device for advancing and retracting the movable platen is provided.
The toggle mechanism is operated by driving an electric motor, a hydraulic cylinder, etc. attached to the toggle support.

By the way, in the injection molding machine, the fixed platen to which the fixed mold is attached is fixed to the frame, but since the thickness of the mold device is different, the mold device is replaced every time the mold device is replaced. It is necessary to adjust the position of the mold clamping device according to the thickness of the device. Further, since the fixed platen and the toggle support of the mold clamping device are coupled by a plurality of, for example, four tie bars, and are relatively positioned, when the position of the mold clamping device is adjusted, the toggle is used. Move the support along the tie bar.

In this case, it is necessary to move the toggle support evenly with respect to the four tie bars. Therefore, a screw is formed on the outer circumference of the four tie bars, four nuts that are respectively screwed into the screws are attached to the toggle support, and the nuts are rotated evenly to move the toggle support. It has become.

FIG. 2 is a side view of a conventional toggle support, and FIG. 3 is a view taken in the direction of arrow A in FIG.

In the figure, reference numeral 51 is a toggle support for supporting a toggle mechanism (not shown), which is mounted so as to be movable in the lateral direction in the figure (not shown) on the frame. Further, 52 is a plurality of, for example, four tie bars installed between a fixed platen (not shown) fixed to the frame and the toggle support 51. In addition,
The right end (not shown) of the tie bar 52 is fixed to the fixed platen.

A plurality of, for example, four tie bar insertion holes 54 are formed in the toggle support 51, and the left end of the tie bar 52 in FIG. 2 is inserted into each of the tie bar insertion holes 54. A mold clamping drive source 66 such as an electric motor or a hydraulic cylinder for moving a crosshead (not shown) to operate the toggle mechanism is attached to a substantially central portion of the left side surface of the toggle support 51 in FIG. .

Here, each of the tie bars 52 has a threaded portion 53 with a thread formed on the outer circumference at the left end in FIG. 2, and an adjusting nut 55 is screwed into the threaded portion 53.
The adjusting nut 55 fits into a nut recess 59 formed on the left side surface of the toggle support 51 in FIG. 2, and is further pressed against the toggle support 51 by a push plate 56 from the left side in FIG. The push plate 56 is fixed by the fixing bolt 57 to the toggle support 51.
2 is fixed to the left side surface in FIG. As a result, the adjustment nut 55 is attached to the toggle support 51 so as to be rotatable and immovable in the axial direction of the tie bar 52.

A nut rotary gear 61 is fixed to each of the adjusting nuts 55 by a gear fixing bolt 62. On the other hand, a synchronous gear 63 is rotatably attached to the left side surface of the toggle support 51 in FIG.
And, as shown in FIG.
The nut rotating gears 61 are arranged at the centers of the nut rotating gears 61 and mesh with the respective nut rotating gears 61.

A synchronous gear drive device 65 is attached to the left side surface of the toggle support 51 in FIG. The synchronous gear drive device 65 has an electric motor (not shown) and a drive gear attached to the rotary shaft of the electric motor, and is arranged around the synchronous gear 63. Since the drive gear meshes with the synchronous gear 63, when the synchronous gear drive device 65 is operated, the synchronous gear 63 is rotated.

As a result, when the synchronous gear drive device 65 is operated, the synchronous gear 63 rotates and each nut rotary gear 61 rotates, and the nut rotary gear 61 is rotated.
The adjusting nut 55 to which is attached rotates. And
Since the tie bar 52 is attached to the fixed platen and cannot rotate, the adjustment nut 55 rotates to move the adjustment nut 55 in the axial direction of the tie bar 52. Therefore, the toggle support 51 to which the adjustment nut 55 is attached is moved in the axial direction of the tie bar 52, and the position of the mold clamping device is adjusted.

Since the four adjusting nuts 55 rotated by the rotation of the synchronous gear 65 all have the same number of rotations, the toggle support 51 has four tie bars 52.
Evenly moved along.

[0014]

However, in the mold clamping device of the conventional injection molding machine, the adjusting nut 55 is used.
Since the work for removing or attaching the tie bar 52 from the toggle support 51 is complicated and the number of steps is large, it takes time to inspect and repair the mold clamping device.

The adjusting nut 55 and the tie bar 52 are
It is included in the members that receive the highest load in the injection molding machine. Therefore, it is necessary to regularly inspect and repair. Especially under severe operating conditions, frequent inspections and repairs are required. Then, the adjusting nut 55
And to check and repair the tie bar 52,
It needs to be removed from the toggle support 51.

In this case, it is necessary to remove each member in the order of (1) to (7) below. (1) Remove the mold clamping drive source 66 from the toggle support 51. (2) The synchronous gear drive device 65 is removed from the toggle support 51. (3) Remove the synchronous gear 63 from the toggle support 51. (4) Remove the four nut rotary gears 61 from the adjusting nut 55. (5) Remove the push plate 56 from the toggle support 51. (6) Remove the adjustment nut 55 from the tie bar 52. (7) Remove the tie bar 52 from the toggle support 51.

The adjusting nut 55 and the tie bar 5 are also provided.
After the inspection and repair of 2 are completed, the above (1) to (7)
It is necessary to attach each member in the reverse order of.

Here, since the synchronous gear 63 has a large diameter and the vicinity of the outer periphery overlaps with a part of the push plate 56, it is necessary to remove the push plate 56 in order to remove it. Further, since the mold clamping drive source 66 overlaps with the vicinity of the center of the synchronous gear 63, it must be removed in order to remove the synchronous gear 63. Therefore, the adjusting nut 5
When inspecting and repairing 5 and the tie bar 52, it is necessary to perform the work of (1) to (3) before performing the work of (4) to (7).

However, since the mold clamping drive source 66 and the synchronous gear 63 are heavy, it takes a long time to attach / detach them to / from the toggle support 51. Further, the mold clamping drive source 66
Is of a type in which the rotational force of the servomotor is transmitted to the ball screw through the pulley and the timing belt, it also takes a long time because the pulley and the timing belt having a complicated mounting structure must be removed.

Further, when the mold clamping drive source 66 and the synchronous gear 63 are mounted, it is necessary to mount the heavy object while accurately positioning it, which makes the work more difficult.
It takes time.

The present invention solves the problems of the mold clamping device of the conventional molding machine described above so that the adjusting nut and the tie bar can be removed without removing the mold clamping drive source and the synchronous gear. An object of the present invention is to provide a mold clamping device for a molding machine, which is easy and time-consuming to inspect and repair the adjusting nut and tie bar.

[0022]

Therefore, in the mold clamping device of the molding machine of the present invention, a guide member having an end formed with a screw, a mold clamping mechanism support member having a guide member insertion hole, and An adjusting nut screwed to the screw of the guide member on the back side of the mold clamping mechanism support member, a nut rotating gear attached to the rear end portion of the adjusting nut, and attached to the back side of the mold clamping mechanism support member, Between the synchronous gear that meshes with the nut rotary gear, and between the nut rotary gear and the rear face of the mold clamping mechanism support member, the adjustment nut is attached to the rear face so that the whole is located outside the outer periphery of the synchronous gear. And a pressing plate that holds down.

In the mold clamping device of another molding machine of the present invention, the push plate can be attached to and removed from the back surface without removing the nut rotary gear.

In the mold clamping device of still another molding machine of the present invention, the pressing plate is an annular plate having an outer diameter smaller than the diameter of the root circle of the nut rotating gear.

In still another mold-clamping apparatus for a molding machine of the present invention, the guide member, the adjusting nut, the nut rotary gear, and the push plate are each plural, and when the synchronous gear is rotated, all of them are provided. The adjusting nut rotates by an equal amount, and the mold clamping mechanism supporting member is moved by an equal amount with respect to all the guide members.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The mold clamping device of the present invention can be applied to various devices and applications, but in the present embodiment, for convenience of explanation, a case where it is applied to an injection molding machine will be described.

FIG. 4 is a schematic view of an injection molding machine according to the embodiment of the present invention.

In the figure, 31 is a frame, 32 is a fixed platen fixed to the frame 31, 11 is a fixed distance from the fixed platen 32, and is movably arranged with respect to the frame 31. Is a toggle support as a mold clamping mechanism supporting member.

Reference numeral 12 is a tie bar as a plurality of, for example, four guide members installed between the fixed platen 32 and the toggle support 11, and the right end in the figure is fixed to the fixed platen 32 by a fixing member 38. To be done. In addition, the toggle support 11 is the tie bar 12
Move along.

Reference numeral 35 denotes a movable platen as a movable mold supporting device which is disposed so as to face the fixed platen 32 and is movable along the tie bar 12 so as to be movable back and forth (movable in the left-right direction in the drawing). is there. Further, a fixed mold 34 is mounted on a mold mounting surface 33 of the fixed platen 32 facing the movable platen 35, and a movable mold is mounted on a mold mounting surface 36 of the movable platen 35 facing the fixed platen 32. 37 is attached.

A drive device (not shown) for moving an ejector pin may be attached to the rear end (left end in the figure) of the movable platen 35.

A toggle mechanism 4 as a mold clamping mechanism is provided between the movable platen 35 and the toggle support 11.
0, a mold clamping drive source 26 of an injection molding machine is attached to the back surface (the surface on the left side in the drawing) of the toggle support 11. The mold clamping drive source 26 has a hydraulic cylinder, a servomotor, etc., and can move the toggle mechanism 40 by moving the crosshead 45 as a driven member forward and backward.

As a result, the movable platen 35 is moved forward (moved in the right direction in the figure) to close the mold, and a mold clamping force obtained by multiplying the propulsive force of the mold clamping drive source 26 by the toggle magnification is generated. The mold is clamped by the mold clamping force. In the present embodiment, the mold clamping force is generated by operating the toggle mechanism 40. However, without using the toggle mechanism 40, the propulsive force by the mold clamping drive source 26 is directly retained as the mold clamping force. Can also be transmitted to the movable platen 35.

The toggle mechanism 40 includes a toggle lever 42 that is swingably supported by the crosshead 45.
A toggle lever 41 swingably supported by the toggle support 11, and a toggle arm 43 swingably supported by the movable platen 35 are provided between the toggle levers 41 and 42, and Toggle lever 41
And toggle arm 43 are linked together.

Next, the toggle support 11 will be described.

FIG. 1 is a side view of a toggle support according to an embodiment of the present invention. FIG. 4 is an enlarged view of portion B of FIG. 4, FIG. 5 is a view taken along arrow C of FIG. 1 according to the embodiment of the present invention, and FIG. It is a side view of another toggle support in an embodiment of the invention.

In the figure, 14 is a tie bar insertion hole as a plurality of, for example, four guide member insertion holes formed in the corner of the toggle support 11, and the toggle support 1
1 is penetrated right and left in FIG. Then, the left ends of the tie bars 12 in FIG. 1 are inserted into the tie bar insertion holes 14, respectively. The mold clamping drive source 26 is attached to substantially the center of the left side surface of the toggle support 11 in FIG.

Each of the tie bars 12 has a threaded portion 13 with a thread formed on the outer periphery at the left end in FIG. 1, and an adjusting nut 15 is screwed into the threaded portion 13.
The adjusting nut 15 is fitted into a nut recess 19 formed as a large-diameter portion on the back side of the toggle support 11 in the tie bar insertion hole 14, and further, from the back side to the toggle support 11 by a push plate 16. It is pressed. The push plate 16 is fixed to the back surface of the toggle support 11 by a plurality of, for example, six push plate fixing bolts 17 as mounting members.

Here, as shown in FIG. 1, the adjusting nut 15 has a substantially cylindrical shape with a flange-like protrusion near the center of the outer circumference. On the other hand, a step is formed in the nut recess 19 and the adjustment nut 15
The side surface on the right side in FIG. 1 of the protruding portion faces the surface of the step portion of the nut recess 19. Also, the adjusting nut 1
The side surface of the protruding portion 5 on the rear surface side is pressed by the pressing plate 16 from the rear surface side. Thereby, the adjusting nut 1
5 is attached to the toggle support 11 rotatably and immovably in the axial direction of the tie bar 12, and the thrust load applied from the toggle support 11 to the adjustment nut 15 is the surface of the stepped portion of the nut recess 19. And is received by the push plate 16.

Here, the push plate 16 is an annular plate member having a hole at the center thereof through which the rear end of the adjusting nut 15 passes, and its outer diameter is a nut rotary gear 21 to be described later.
It is desirable that the diameter is smaller than the diameter of the root circle of, but it may have any shape. In this case, if the push plate 16 is located entirely outside the outer periphery of the synchronous gear driving device 25, which will be described later, that is, when viewed from the back side, the synchronous gear 23 is the push plate 16. The shape and size may be such that they do not overlap. Further, the push plate 16 may be composed of a plurality of members instead of a single member.

A plurality of nut rotary gears 21, for example, are provided at the rear end of each of the adjusting nuts 15.
It is fixed by four gear fixing bolts 22. In addition,
The rotation center axes of the nut rotating gear 21 and the adjusting nut 15 are aligned with each other. Here, the diameter of the root circle of the nut rotary gear 21 is preferably larger than the diameter of the push plate 16. As shown in FIG. 5, the nut rotary gear 21 is formed with a plurality of substantially elliptical working holes 24. The work hole 24 is provided with the pressing plate fixing bolt 17
Is formed at a position corresponding to each of the above, and the work such as attaching and detaching the push plate fixing bolt 17 and adjusting the tightening force can be performed without removing the nut rotating gear 21. The gear fixing bolt 22 is attached to a position closer to the rotary shaft than the push plate fixing bolt 17.

A synchronous gear 23 is rotatably attached to the left side surface of the toggle support 11 in FIG. 1 via a bearing (not shown). Then, the synchronous gear 2
As shown in FIG. 5, 3 is arranged at the center of the four nut rotary gears 21, and each of the nut rotary gears 2 is
It meshes with 1.

Further, the toggle support 11 has a structure shown in FIG.
The synchronous gear drive 25 is attached as shown in FIG. The synchronous gear driving device 25 has an electric motor (not shown) and a drive gear attached to the rotary shaft of the electric motor, and is arranged around the synchronous gear 23. Since the drive gear meshes with the synchronous gear 23, when the synchronous gear drive 25 is operated, the synchronous gear 23 is rotated.

As a result, when the synchronous gear driving device 25 is operated, the synchronous gear 23 rotates and the synchronous gear 23
The nut rotary gears 21 meshing with the respective nut rotary gears 21 are rotated, and the adjusting nut 15 to which the nut rotary gears 21 are attached is rotated.

The tie bar 12 cannot be rotated because the right end in FIG. 4 is attached to the fixed platen. Therefore, the adjusting nut 15 moves in the axial direction of the tie bar 12 by rotating.
As a result, the entire toggle support 11 to which the adjusting nut 15 is attached is moved in the axial direction of the tie bar 12, and the position of the mold clamping device is adjusted.

Since the four nut rotary gears 21 have the same diameter and the same number of teeth, the four nut rotary gears 21 and the adjusting nut 15 which are rotated by the rotation of the synchronous gear 23 all have the same rotational speed. And
The screws formed on the four adjusting nuts 15 and the screws formed on the screw portions 13 of the four tie bars 12 are all the same. Therefore, since the movement amounts of the four adjusting nuts 15 with respect to the tie bars 12 are equal, the toggle support 11 can be moved evenly along the four tie bars 12.

Next, the operation of the mold clamping device having the above construction will be described.

First, the mold clamping drive source 26 is actuated, and the crosshead 45 is moved forward to move the toggle mechanism 40.
Operate. As a result, the movable platen 35 is moved forward, the movable mold 37 is joined to the fixed mold 34, the mold is closed, and then the mold is clamped. Subsequently, resin is injected at a high pressure from an injection device (not shown), and is filled in the cavity spaces of the movable mold 37 and the fixed mold 34. Then, the resin is cooled and solidified to form a molded article. Then, the mold clamping drive source 26 operates, and the crosshead 45 is retracted,
The movable platen 35 is retracted, the movable mold 37 is separated from the fixed mold 34, and the mold opening is performed. Subsequently, when an ejector rod (not shown) is moved forward, the ejector pin projects into the cavity inside the movable mold 37 to eject the molded product. As a result, the molded product is taken out. By repeating the above operation, a large number of molded products are molded.

When molding different molded products,
The movable mold 37 and the fixed mold 34 as the mold device are replaced. Here, when the thickness of the mold device is different before and after the replacement, it is necessary to adjust the position of the mold clamping device according to the thickness of the mold device after the replacement. In this case, the position of the mold clamping device is adjusted by moving the toggle support 11 in the axial direction of the tie bar 12.

First, the synchronous gear drive 25 is operated to rotate the synchronous gear 23. Then, the synchronous gear 2
All of the nut rotary gears 21 meshing with 3 are rotated by equal amounts, and the adjusting nuts 15 to which the nut rotary gears 21 are attached are rotated by equal amounts. Then, as the adjusting nut 15 rotates, the toggle support 11 to which the adjusting nut 15 is attached is moved in the axial direction of the tie bar 12, and the position of the mold clamping device is adjusted. That is, the toggle support 11 can be moved by an equal amount with respect to all the tie bars 12.

Here, the pitch of the screw formed on the adjusting nut 15 and the screw portion 13 of the tie bar 12, and
Based on the number of teeth of the drive gears of the nut rotary gear 21, the synchronous gear 23, and the synchronous gear drive 25, the toggle support 1
The relationship between the movement amount of 1 and the rotation speed of the synchronous gear drive device 25 can be calculated in advance. Therefore, the toggle support 11 can be moved by a predetermined amount by adjusting the rotation speed of the synchronous gear drive device 25.

In the injection molding machine, since the adjusting nut 15 and the tie bar 12 are included in the members that receive the highest load, it is necessary to regularly inspect and repair them. Then, the adjusting nut 15 and the tie bar 12
The adjustment nut 15 and the tie bar 12 must be removed from the toggle support 11 in order to perform inspection and repair.

In this case, each member is removed in the order of (1) to (4) below. (1) Remove the gear fixing bolt 22 and remove all the nut rotary gears 21 from the adjusting nut 15. (2) Remove the push plate fixing bolt 17 and remove the push plate 16 from the toggle support 11. In this case, since the diameter of the bottom circle of the nut rotary gear 21 is larger than the diameter of the push plate 16, the synchronous gear 23 does not overlap the push plate 16.
Therefore, without removing the synchronous gear 23, the push plate 1
6 can be removed. (3) Rotate the adjusting nut 15 to remove it from the screw portion 13 of the tie bar 12. (4) Pull out the tie bar 12 from the tie bar insertion hole 14 and remove it from the toggle support 11.

As a result, the adjustment nut 15 and the tie bar 12 can be inspected and repaired. After the inspection and repair of the adjusting nut 15 and the tie bar 12 are completed, the respective members are attached in the reverse order of (1) to (4).

As described above, in the present embodiment, the diameter of the bottom circle of the nut rotating gear 21 attached to the adjusting nut 15 is set to the push plate 1 for fixing the adjusting nut 15.
6 is larger than the diameter of 6, and the synchronous gear 23 does not overlap the push plate 16.

Therefore, the adjusting nut 15 and the tie bar 1 are
In the case of inspection, repair, etc. of 2, the push plate 16 is removed without removing the synchronous gear 23, and the adjustment nut 1
5 and the tie bar 12 can be removed from the toggle support 11. Therefore, it is not necessary to remove the heavy synchronous gear 23 and the mold clamping drive source 26 from the toggle support 11, so that the adjustment nut 15 and the tie bar 12 are not necessary.
The inspection and repair work is easy and takes no time.

Further, the mold clamping drive source 26 is, for example,
It is of a type in which the rotational force of the servo motor is transmitted to the ball screw via a pulley or a timing belt, and even if it has a complicated mounting structure, it is not necessary to remove the mold clamping drive source 26. Therefore, the work for inspecting and repairing the adjustment nut 15 and the tie bar 12 is performed by the mold clamping drive source 26.
Is not affected by the structure of.

In the above embodiment, the toggle support is provided with the recess for the nut. However, as shown in FIG. 6, the recess is not provided on the back side of the toggle support, and the adjustment nut is projected on the push plate. You may make it provide the notch part which covers a part. Further, in the above embodiment,
Although the horizontal type injection molding machine in which the movable platen moves in the horizontal direction (horizontal direction) has been described, the movable mold supporting apparatus of the present invention is a vertical type in which the movable platen moves in the vertical direction (vertical direction). It can also be applied to an injection molding machine. Further, the movable mold supporting device of the present invention can be applied to a molding machine such as a die cast machine and an IJ sealing press, in addition to the injection molding machine.

Further, the present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0060]

As described above in detail, according to the present invention, in the mold clamping device of the molding machine, the mold clamping mechanism support provided with the guide member having the screw formed at the end and the guide member insertion hole is provided. A member, an adjusting nut screwed to the screw of the guide member on the back side of the mold clamping mechanism support member, a nut rotating gear attached to the rear end portion of the adjusting nut, and a back surface of the mold clamping mechanism support member. Mounted between the nut rotating gear and the back surface of the mold clamping mechanism supporting member so that the whole is located outside the outer periphery of the synchronizing gear, and is mounted on the back surface. And a pressing plate that presses the adjusting nut.

In this case, the adjustment nut and the guide member can be removed without removing the synchronous gear, and the work for inspecting and repairing the adjustment nut and the guide member is easy and time-consuming. Never.

[Brief description of drawings]

FIG. 1 is a side view of a toggle support according to an embodiment of the present invention, which is an enlarged view of part B of FIG.

FIG. 2 is a side view of a conventional toggle support.

FIG. 3 is a view taken along arrow A in FIG. 2 of the related art.

FIG. 4 is a schematic diagram of an injection molding machine according to an embodiment of the present invention.

FIG. 5 is a view on arrow C of FIG. 1 in the embodiment of the present invention.

FIG. 6 is a side view of another toggle support according to the embodiment of the present invention.

[Explanation of symbols]

11 Toggle support 12 tie bar 14 Tie bar insertion hole 15 Adjustment nut 16 push plate 17 Push plate fixing bolt 19 Recess for nut 21 Nut rotating gear 23 Synchronous gear 24 Working hole

Claims (4)

[Claims] 1. A guide member having a thread formed at an end thereof, a mold clamping mechanism supporting member having a guide member insertion hole, and a rear surface of the mold clamping mechanism supporting member. An adjusting nut screwed into the screw of the guide member, and (d) a nut rotating gear attached to the rear end of the adjusting nut,
(E) A synchronous gear that is attached to the back surface of the mold clamping mechanism support member and meshes with the nut rotation gear; And a push plate attached to the back surface so as to be located outside of the outer periphery of the press plate for pressing the adjustment nut. 2. The mold clamping device for a molding machine according to claim 1, wherein the push plate can be attached to and removed from the back surface without removing the nut rotating gear. 3. The pressing plate is an annular plate having an outer diameter smaller than a diameter of a root circle of the nut rotating gear.
The mold clamping device of the molding machine according to 1. 4. The guide member, the adjusting nut, the nut rotating gear, and the pressing plate are each plural, and when the synchronizing gear is rotated, all the adjusting nuts rotate by an equal amount, and the mold clamping mechanism support. The mold clamping device for a molding machine according to claim 1, wherein the member is moved by an equal amount with respect to all the guide members.