JPS6292821A - Mold-fixing device in injection molder - Google Patents

Abstract

PURPOSE:To simply, quickly and surely mount and dismount a mold by providing driving members which fix the mold to a fixed platen and to a movable platen respectively by engaging wedge-shaped engaging parts at the ends on the mold mounting part side with the slants of clamping members. CONSTITUTION:Upon receipt of an end detection output of mold carrying-out from a limit switch, a control unit puts the respective air cylinders 74 of a mold-fixing device 7 into actuation. Consequently, clamping members 76 slide in the guide holes 73b of guide blocks 73 so that the slants at the tips 76a of the clamping members press the opposing slants at wedge-shaped engaging parts 32b of molds 31 and 32. As a result, the fixed mold 31 and the movable mold 32 are installed and fixed to a fixed platen and a movable platen 23. When an injection molding cycle is completed, the respective air cylinders are actuated in retreat and the clamping members 76 are released from the opposing slants of the wedge-shaped engaging members 32b in order to dismount the molds 31 and 32 from a mold mounting part. Thus, the mounting and dismounting of the molds is performed simply, quickly and surely.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a mold fixing device for an injection molding machine.

Conventional technology When installing a mold, for example, in injection molding, a large number of screw holes are drilled in the mold mounting surface of the movable plate and fixed plate of the mold clamping device as the mold mounting part, and the external shape of the mold is adjusted. Bolts are inserted through the insertion holes of each fixture and screwed into the screw holes, using screw holes according to the dimensions, with the peripheral edge of the mold being held between the appropriate number of fixtures and the mold mounting surface. The mold is installed by tightening the fixture.

For this reason, the above-mentioned frequent operations have to be performed every time the mold is replaced, resulting in inefficiency.

Problems to be Solved by the Invention It is an object of the present invention to provide a mold fixing device that can easily, quickly and reliably attach and detach a mold.

Means for Solving the Problems The mold fixing device of the present invention is a mold fixing device for fixing a mold to a movable platen and a fixed platen of an injection molding machine, and is provided at the lower part of the movable platen and the fixed platen. a wedge-shaped engaging part fixed to the upper and lower peripheral edges of the mold attachment part side end of the mold, and a sloped surface that can be engaged with the wedge-shaped engaging part at the tip. a clamp member, and the clamp member is slidably a
The guide member and the clamp member fixed to the upper and lower parts of the fixed plate and the movable plate on the right side of the hole to be Ua are made to protrude from the hole, and the wedge-shaped engaging portion and the inclined surface of the clamp member are engaged with each other. It consists of a drive member that fixes the mold to a fixed plate and a movable plate, respectively.

For production First, the mold is placed on a mold support member and a movable platen is mounted.

Inserted between fixed plates. Next, when the driving means is actuated, the clamp member is driven and advances for the first time in the guide hole of the guide member, and the inclined surface of the clamp member engages with the wedge-shaped engagement provided at the peripheral edge of the mounting end of the mold. It presses into engagement with the inclined surface of the joining part. As a result, the peripheral edge of the mold is pressed and fixed to the mold mounting portions of the movable platen and the fixed platen, and is mounted on the mold mounting portions.

On the other hand, when the drive means is released, the clamp member retreats and the engagement between the inclined surfaces of the clamp member and the engagement means is released;
The mold is removed from the mold mount.

Example Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 8 show an automatic mold changer for an injection molding machine equipped with a mold fixing device according to an embodiment of the present invention, and the mold changer 10 is installed at a mold mounting part of an injection molding machine 20. 21, that is, the mold 1IYi of the injection molding 120 fixing a! ! 2
2 and the movable platen 23, the rotary table device 40 is equipped with a rotary table 50, and the molds 30 (four molds in this embodiment) on the table 50 are directed toward the mold mounting portion 21. A conveying device 6 for carrying out the work and carrying it in in the opposite direction.
0, and a mold fixing device 70 for detachably mounting the mold 30 on the mounting portion 21.

Each mold 30 consists of a fixed mold 31 and a movable mold 32, and the external dimensions of the molds 31 and 32 are substantially the same when they are joined, and the distance between the outer surfaces of the fixed mold 31 and the movable mold 32 is substantially the same. The distance is when the mold is touched, and some examples of the mold are fixed platen 22 when removed.
and the distance between the movable 5i1f23. For this reason, various molds are newly manufactured with the same external dimensions, and in the case of existing molds, for example, the end of the mold mounting part side that protrudes outward from the main body of the mold 30, that is, the large diameter part 31a. , 32a are attached by joining and fixing a dimension body plate to the side end surface.

A plurality of mold placement parts each having the same configuration are provided on the upper surface of the rotary table 50, and in this embodiment, as shown in FIG. 51 are arranged at angular intervals of 90 degrees. Each mounting section 51 slidably supports the joined mold 30 and has a pair of roller rows 52.5 extending parallel to each other in the radial direction of the table.
2, and a round bar-shaped guide member 53 is fixed to the upper surface of the table 50 by a support frame 54 having a right triangular cross section immediately outside and above each roller row 52 (FIG. 1), and cooperates with the roller row 52. It works to form a mold conveyance path. The outer end of the guide member 53 is bent outward to facilitate the conveyance of the mold 30 into the conveyance path. Furthermore, a rotary table 50
An inner stopper 55 (see Fig. 23), which is shaped like a letter in plan view, is fixedly installed on the upper surface at the inner end position of the mold conveyance path.
The stopper 55 is provided with a limit switch S5 that prevents the mold from deviating from the predetermined mounting position of 0 and detects contact of the mold 30. A guide hole 56 is formed in the rotary table 50 at a position between the outermost roller of the roller row 52 and the adjacent roller, and a mold stopper 58 (described later) moves the guide hole 56 once. It can be inserted freely.

The machine frame 80 is an assembly of various square vibrators, etc., and the middle part of this machine frame 80 forms the base 41 of the rotary table 50 configured as described above. A plurality of thrust ball bearings 41a that support the table 50 in the height direction are provided on the upper surface of the peripheral edge of the base 41, and a radial bearing, such as an A-ille bearing, is provided in the center that supports the rotating shaft 50a of the table 50. Resistance bearings 4 i and b are provided, respectively, so that the table 50 can rotate smoothly even when a considerably heavy mold 30 is placed thereon. The rotating shaft 50a of the table 50 is connected so as to be driven by the motor 42 via a chain 43 stretched between a sprocket 50b fixed to its lower end and sprockets 1 to 42a fixed to the output shaft of the motor 42. There is. Further, as a rotational position detection means of the rotary table 50, four protrusions (not shown) having different radial positions are protruded from the lower surface of the table 50 at angular intervals of 90 degrees, and the base 41 Four limit switches 81-S4 are arranged on the same radial axis on the upper surface and are actuated by the four projections D1-D4, respectively. Furthermore,
A guide member 44 and an air cylinder 45 are fixedly installed on one side of the machine frame 80 in alignment with a conical hole 57 provided on the lower surface of the rotary table 50, and a rotation stopper 46 having a conical end 46a is attached to the air cylinder 45. The guide member 44 is fixed to a cylinder rod 45a, and is driven forward and backward by the air cylinder 45 to slide within the guide hole 4a of the guide member 44.

Further, as shown in FIGS. 3 and 4, an interlocking mechanism between the rotation stopper 46 and the mold stopper 58 is provided. That is, one end of the link 47 is rotatably connected to the lower end of the mold stopper 58, and a link 47' is rotatably connected to the other end of the link 47, and a tension spring 48 is connected to the outer end of the link 47'. The mold stopper 58 is urged upward via the link 47 and held in the guide hole 56 in a fitted state. - The intermediate portion of the link 47' is swingably supported by a shaft 49 fixed to the rotary table 50, and its inner end protrudes into the advancing and retracting path of the rotation stopper 46, and the rotation stopper 46 is fitted into the hole 57. At this time, the inner end of the link 47' contacts the circumferential surface of the rotation stopper 46 and is rotated counterclockwise, thereby moving the mold stopper 58 downward via the link 47.

The conveyance device 60 is disposed in the upper part of the machine frame 80, and includes a motor 61 fixed to the upper end of one side frame of the machine frame 80, and includes a sprocket 61a fixed to the motor shaft of the motor 61 and the upper end of the other side frame. A chain 61c is stretched between the driven sprockets 61b provided in the drive sprocket 61b. A traveling body 63 is non-rotatably but slidably supported by spline connection, for example, to a guide rail 62 extending between both side frames of the machine frame 80 below the chain 61C.
4 to the chain 61c.

The traveling body 63 has a conveying means 66 equipped with an air cylinder 65.
The rear end of the conveying means 66 is fixed with a bolt, and a pair of mold capturing means 67 is rotatably supported at the front end of the conveying means 66 via a bin 66a. The rear end of the air cylinder 65 is the conveying means 6
The cylinder rod 65a is rotatably supported on the intermediate projecting wall of the mold catching means 6 via a bottle 66b, and the tip of the cylinder rod 65a is attached to a pair of mold catching means 6.
It is rotatably connected to a bottle 67a to which 7 is connected. Furthermore, each mold capturing means 67 has a notch 67b formed on its lower surface, and is provided protruding from the side surface of the large diameter portions 31a and 32a of the fixed and movable molds 31 and 32 of the mold 30 on the conveying device 60 side, respectively. The pair of engaging arms 31a' and 32a' can be freely engaged and detached.

As shown in FIG. 5, both ends of the chain 61c are
A rod 61d is screwed to the threaded inner peripheral surface of 1" so that it can move forward and backward.
, 61e, and after adjusting the tension of the chain 61c by moving rods 61 and 61e back and forth, it is fixed with nuts 61g and 61h. As shown in FIG. 6, a connecting means (connecting device) 6 is provided integrally with the chain 61c at the intermediate portion of the chain 61C.
No. 4 rod member 64a is interposed, an end member 64b is slidably fitted to the front end of the rod member 64a, and one end of a hollow cylindrical member 64C is screwed and fixed to the threaded step of the end member 64b. A rod member 64a is slidably inserted into the closed end wall. The annular spring receiver housed in the hollow cylindrical member 64C has a member 64d as a rod member 64a.
Coil springs 64e and 64 are fitted and fixed by welding or the like, and the end member 64b and the spring receiver are interposed between the member 64d and between the member 64d and the closed end wall of the cylindrical member 64c.
f is fitted into the rod member 64a.

Further, a connecting plate 64g is integrally provided on the peripheral wall of the cylindrical member 64c, and the entire connecting means 64 is fixed to the traveling body 63 via the connecting plate 64q with bolts and nuts.

The mold fixing device 70, as shown in FIGS. 7 and 8,
Fixed side and movable side molds 31 and 32 are respectively arranged on opposing end surfaces of the fixed platen 22 and the movable platen 23 of the injection molding machine 20.
It consists of four fixing devices that can face the upper and lower edges of the large diameter portions 31a and 32a, and each structure is approximately the same, so the fixing device 70' disposed at the lower edge of the movable platen explain. The fixing device 70' includes a roller row 71, and the roller row 71 is connected to the roller row 52 of the mold mounting section 51 and the roller row 24 provided in the injection molding machine 20 in alignment with the roller row 52 (FIG. 1). ) to support the mold 30 in the height direction when the mold is carried in and out of the mold mounting section 21. Reference numeral 72 designates a mold support member having a hole for supporting one end of each roller shaft of the roller row 71, and is fixed to the movable platen 23 with bolts 72a, 72a. A mold support member 72' having an L-shaped cross section and having a hole for supporting the end.
and a flat plate 72 interposed between both mold support members 72 and 72'.
'' and the guide block 73 are fixed together by fixing holes 1 to 73a.Furthermore, air cylinders 74 and 74 are installed on the bottom surfaces of the mold support member 72' and the flat plate 72'' through the guide holes 73b of the guide block 73, It is fixedly aligned with 73b.

Then, the clamp member 76 is connected to the shaft 75 of the connector 75 via the connector 75 fixed to the upper end of each cylinder rod 74a.
It is rotatably connected around the guide hole 73b.
is slidably inserted with some play, and the inclined surface 76a on the movable platen 23 side at the upper end is fixed with screws to the lower edge of the large diameter part 32a of the movable mold 31 on the side opposite to the movable platen. It can be freely engaged with and disengaged from the opposing inclined surface of the wedge-shaped engagement member 32b. Note that the fixing device 70' is attached to the lower edge of the fixed plate.
The same structure is provided, but the upper edges of the movable platen 22 and the fixed platen are fixed Hti! 1 does not have the O-La row 71. In FIG. 8, reference numerals 23a and 23a are stoppers protruding from the surface of the movable platen 23, which abut and hold the mold 30 at the unloading end position, that is, the mold attachment position.

Note that a stopper is similarly provided on the fixed platen 22 side, and a limit switch (not shown) for detecting contact of the mold 30 is attached to the stopper.

Hereinafter, an automatic mold changing method according to an embodiment of the present invention will be described based on the operation of the automatic changing machine 10 for an injection molding machine having the above-mentioned configuration.

First, with the mold 30 joined to the fixed mold 31 and the movable mold 32 on each of the mold mounting portions 51 of the rotary table 50 of the mold exchanger 10, the molds 30 are moved by appropriate conveyance means (path shown). It is placed. Next, the mold clamping mechanism is driven and the movable platen 23
is moved to the mold exchange position and positioned, and then the control device (path shown) starts the motor in order to mount the required mold 30 on the injection molding machine 20 in the mold removal state prior to starting the injection molding cycle. 42 is rotated, and as the motor rotates, the rotating shaft 50a of the rotating table 50 is rotationally driven via the sprocket 42a, the chain 43, and the sprocket 50b, and the rotating table 50 supported on the base 41 via the ball bearing 41a is rotated. Rotates smoothly -4. Then, at rotation #J[13 of the rotary table 50, four limit switches 81 to S4 (not shown) on the top surface of the base 41 are sequentially activated and output, and the corresponding ones of the mold M and the mounting section 1 are transferred to the injection molding machine 2.
The desired mold 30 approaches the mounting part 21 based on the detection output of the glue switch
It is determined that υ is υ, and when the rotation of the cylinder rod 42 is stopped and the air cylinder 45 is activated, the cylinder rod 45a
A rotation stopper 46 integrated with the rotation stopper 46 moves upward in the guide hole 4a of the guide member 44 and fits into the conical hole 57 of the rotary table 5o, thereby reliably locking the table 50 in this rotational position. The upward movement of the rotation stopper 46 pushes up the inner end of the link 47' that protrudes into the advancing/retreating path of the stopper 46, and the link 47' rotates in the counterclockwise direction in FIG. The mold stopper 58 connected to the outer end of the roller row 53 through the link 47 resists the spring force of the tension spring 48 and moves the mold to the position shown by the two-dot chain line in FIG. The guide hole 56 is moved down to a position where it does not interfere with the metal mold 30, and as a result, the mold is allowed to be carried out.

Next, the air cylinder 65 of the conveying means 66 in the position shown in FIG.
5a advances, the pair of mold capturing means 67 rotates counterclockwise around the pin 66a, and each means 67b locks the mold 30.
The engagement arm portion 31a'.

328' respectively. Then, the motor 61 is rotationally driven, and the chain 61C stretched between the sprockets 61a and 61b moves around, and the traveling body connected to the chain 61c via the connecting means 64 is directed toward the mold mounting part 21. drive. At the start of this running, the rod member 64a and the spring receiver, which are provided so as to be able to move together with the chain 610, are moved to the member 6.
4d immediately starts moving, while the end portion 64b3 cylindrical member 64c etc. that are integrated with the running body 63 engaged with the mold 30 via the mold catching means 67 try to remain stationary for a while. The spring 64e interposed between the rod member 64a side and the cylindrical member 64c side is compressed. As a result, the tension WJM applied to chain 61C at the start of running
The force is absorbed by this relative movement, and no unreasonable force is applied to the chain 61c. Thereafter, as the compression of the spring 64e progresses as the chain 61C moves, the cylindrical member 64c on either side of the rod member 64a is compressed via the spring 64e.
The sides are substantially connected, and the cylindrical member 64c and the like also start moving in the same direction, and as a result, the traveling body 63 integrated with the connecting means 64 via the connecting plate 64tJ, and therefore the conveying means 66 and the mold capturing means 67, the mold 30 engaged with the traveling body 63 starts to be transported. Thereafter, when the chain 61C2 connecting means 64 and the traveling body 63 come to move steadily together, both the coil springs 64e and 64r are balanced, and the constituent members of the connecting means 64 take approximately the same positional relationship as shown in FIG.

As the traveling body 63 travels, the mold 30 is guided by the guide member 53 over the roller row 52, then over the roller row 24 on the side of the injection molding 1120, and then over the roller row of the mold fixing device 70. 71 and is carried out to the mold attachment section 21. When the mold 30 reaches the mold mounting position (FIG. 9), the mold has the same dimensions as the fixed platen 22 and the movable platen 23.
Since it is slightly smaller than the distance between the fixed platen 22 and the movable platen 23, it comes into contact with a stopper 23a provided in the mold mounting part 21, and a limit switch (not shown) attached to the stopper 23a is activated. . When this carrying out is stopped, the running body 63 integrated with the mold 30 via the mold catching means 67 and the end member 64b integrated therewith.

The cylindrical member 64c etc. immediately stop running, but the chain 6
1G, even if the motor 61 is stopped immediately, there is a time delay until the vehicle stops running due to the inertia of the motor 61. However, even though the chain 61C runs during this time, the chain 61C
The rod member 64a integrated with C can run while compressing the spring 64e, and the shock is absorbed, so the chain 61
No excessive force is applied to 0.

Upon receiving the mold unloading completion detection output from the limit switch, the control device controls each air cylinder 7 of the mold fixing device 7o.
Activate 4. As the cylinder door 4a of the air cylinder 74 moves forward, the clamp member 76 connected to the cylinder door 4a via the connector 75 slides in the guide hole 73b of the guide block 73, and the mold 30 is moved by the inclined end surface 76a.
Wedge-shaped engaging portion (partially shown as 32b; the same applies hereinafter)
This results in pressure on the opposite inclined surface of the As a result, the large diameter portions 31a of the fixed mold 31 and the movable mold 32.

32a is supported in the height direction by the roller row 71 of the fixing device 70 and is gripped by the clamp member 76, and the large diameter portions 31a work between the clamp member 76 and the wedge-shaped portion 32b by a wedge action.

32a is applied to the fixed platen 22 and the movable platen 23, and the fixed side mold 31 and the movable side mold 32 are attached and fixed to the fixed platen 22 and the movable platen 23, respectively.

Next, the air cylinder 65 of the conveying means 66 is driven backward, and as the cylinder rod 65a moves backward, the mold catching means 67 rotates clockwise around the bin 66a, and the notch 67b engages with the mold 30. Joint arm portions 31a', 32a
9) and reaches a retracted position that does not interfere with the mold closing and mold opening operations of the injection molding 120.

After that, when the injection molding cycle using the mold 30 of the injection molding l120 is finished, the mold clamping position VR is set to the mold closing position,
The engagement arm portion 3 of the mold 30 is moved forward by driving the air cylinder 65 forward.
A mold capturing means 67 is engaged with 1a' and 32a'.

Next, each air cylinder 74 of the mold fixing device f5f70 is operated backward, and the clamp member 76 integrated with the cylinder rod 74a moves backward inside the guide hole 73b of the guide block 73, so that its tip inclined surface 76a is attached to the mold 30. The wedge-shaped engagement member 32b is separated from the opposing inclined surface, and the mold 30 is removed from the mold attachment portion 21. Next, the motor 61 is driven in the reverse direction, and the connecting means 64. is connected to the chain 61c driven by the motor 61. Running body 63. The mold 30 connected via the conveying means 66 and the mold capturing means 67 is moved to the rotary table 50.
The mold is carried toward the mold mounting section 51. At the start of this import,
As before, the tensile impact force applied to the connecting means 64 is absorbed by the spring 64 of the means 64 and the chain 61
No shock is applied to C. The mold 30 is driven by the conveyance device 60, and the mold 30 is moved by the roller row 71 of the mold fixing device 70.
, 31 is transferred over the roller row 24° on the side of the molding 41120 and the roller row 52 on the conveyance path, reaches the mold mounting section 51, comes into contact with the inner stopper 55, and the limit switch attached to the stopper 55 is activated. Then, the motor 61 is stopped. Since the impact applied to the connecting means 64 at the end of this conveyance is absorbed by the spring 64f of the means 64, no unreasonable force is applied to the chain 61c. and,
The air cylinder 45 is driven backward in response to the carry-in end detection output from the limit switch, and the rotation stopper 46 integrated with the cylinder rod 45a moves downward in the guide hole 4a of the guide member 44 to rotate the conical part of the rotary table 50. IdlB2 is removed from the shaped hole 57, and the mold 30 can be rotated for the next selection. At the same time, as the rotation stopper 46 moves downward, the link 47' whose inner end was in contact with the stopper 46 is released and rotates clockwise in FIG. 3 by the spring force of the tension spring 48. A mold stopper 58 connected to the link 47' via the link 47 is biased by the spring force of the tension spring 48 and protrudes upward from the upper surface of the roller row 52, and the mold stopper 58 that is connected to the link 47' is pushed upwardly from the upper surface of the roller row 52, and the mold stopper 58 that is connected to the link 47' It comes into contact with the outside of the mold 30 and prevents the mold 30 from coming off.

As a result, the automatic replacement work of the mold 30 is completed.

Although the above embodiment describes a mold fixing device in an injection molding machine, the present invention is not limited thereto, and can be applied to any PJ device.

Effects of the Invention The wedge-shaped engagement means fixed to the peripheral edge of the side end of the mold mounting part of the mold and the clamp member fitted into the guide hole of the guide member fixed to the mold mounting part are inclined to face each other. The surfaces are removably press-engaged by driving the clamp member with the driving means, and the mold is removably attached and fixed to the mold mounting portion, so the mold can be easily installed and removed. It can be done quickly and reliably.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an automatic mold changer for an injection molding machine equipped with a mold fixing device according to an embodiment of the present invention;
The figure is a plan view showing the rotary table, Figures 3 and 4 are an enlarged side view and a partially cross-sectional end view showing the interlocking structure of the rotation stopper and the mold stopper, and Figure 5 is a partial cross-sectional view of the chain. FIG. 6 is a partially enlarged cross-sectional view showing a connecting member according to an embodiment of the present invention; FIG. 6 is an enlarged partial cross-sectional side view showing a connecting device according to an embodiment of the present invention; FIGS. A partially enlarged partially sectional side view and a partially enlarged front view of the device, and FIG. 9 are partial views for explaining the operation of the conveying device. 10... Automatic mold exchange machine, 20... Injection molding machine, 2
DESCRIPTION OF SYMBOLS 1... Mold mounting part, 22... Fixed plate, 23... Movable plate, 23a... Stopper, 30... Mold, 31...
・・Fixed side mold, 32 ・・Movable side mold, 31a, 32
a... Large diameter part of the mold, 31a', 32a'・
... Engagement arm portion, 32b... Wedge-shaped engagement member, 40.
...Rotary table device, 41...Base, 42...Motor, 44...Guide member, 45...Air cylinder, 46...Rotation stopper, 47.47'...Link, 48 ... Tension spring, 50... Rotating table, 51... Mold fly, neck, 52... Roller row, 55... Inner stopper, 56... Guide hole, 5
7... Circular hole, 58... Mold stopper, 60...
- Conveyance device, 61... Motor, 61c... Chain, 63... Traveling body, 64... Connection means, 64a...
・Rod member, 64b... End member, 64c... Hollow cylindrical member, 6/Id... Spring receiver is member, 640.64
f...Spring, 65...Air cylinder, 66.
... Conveyance means, 67 ... Mold capturing means, 70 ... Mold fixing position, 72.72' ... Mold support member, 73
...Guide block, 73. b...Guide hole, 74
... Air cylinder, 75 ... Connector, 7G ... Clamp member, 76a ... Inclined surface, 80 ... Machine frame. Figure 2 Figure 4 Figure 6 Figure 7 Figure 9 Procedure Amendment (Method) % Formula % 1. Indication of the case 1985 Special revision application No. 230942 February 2. Name of the invention Injection molding machine Mold fixing device 3, relationship with the case of the person making the amendment Patent Applicant Address 3580 Kobaba, Oshikusa, Oshino-mura, Nanbu Ru-gun, Yamanashi Prefecture Name: Fa Suri Co., Ltd. 4, Agent address: 105-5, Reason for refusal Date of notification: January 8, 1985 (sent on January 128, 1985) 6.
Number of inventions increased by amendment None 7. Drawings subject to amendment. 8. Contents of the amendment Figure 1 of the drawing will be amended as shown in the attached sheet (no changes to the content).

Claims (3)

[Claims] (1) In a mold fixing device that fixes a mold to a movable platen and a fixed platen of an injection molding machine, a mold support member provided at the lower part of the movable platen and fixed platen, and a mold mounting part side of the mold. A wedge-shaped engaging portion fixed to the upper and lower peripheral edges of the end portion, a clamp member having an inclined surface at its tip that can be engaged with the wedge-shaped engaging portion, and a hole into which the clamp member is slidably inserted. The guide member and the clamp member fixed to the upper and lower parts of the fixed plate and the movable plate having the above are protruded from the hole, and the wedge-shaped engaging portion and the inclined surface of the clamp member are engaged, and the mold is fixed to the fixed plate. A mold fixing device for an injection molding machine, characterized in that the mold fixing device includes drive members fixed to movable plates. (2) The mold fixing device for an injection molding machine according to claim 1, wherein the mold support member includes a roller row for slidably supporting the mold. (3) A mold fixing device for an injection molding machine according to claim 1 or 2, wherein the driving member is an air cylinder.