JPH0576626U - Mold changing device for press machine - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to safely replace a large mold used in a press machine so that the mold changer does not interfere with the press work. [Structure] A pair of front and rear rails 5 and 6 are arranged on the floor on the front side of the press machine 1, and a pair of left and right rails 5 and 6 capable of carrying the mold 3 in the mold replacement direction (front and rear direction) are arranged. The transfer device 10 is provided, and the die 3 is pushed onto each transfer device 10.
A push-pull device 30 for pull driving is integrally provided,
During the pressing operation, the left and right transfer devices 10 can be retracted to the left and right retracted positions, respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mold exchanging device for exchanging a mold of a press machine, and more particularly to a device suitable for exchanging a large mold.

[0002]

[Prior Art]

 Conventionally, as a method for exchanging the molds of a press machine, there is a trolley method that uses a mold carrier, and a mold that has been conveyed by an overhead traveling crane or a forklift is a die roller (this is provided with multiple idle rollers on the frame. It is known that the die roller type is used for replacement. In the trolley method, the mold carrier is provided with two mold loading parts, the mold loading part is provided with a roller conveyor for transporting the mold in the mold transport direction, and the mold carrier and the press machine. An intermediate roller stand is provided between the bolsters, and the die is transferred through the intermediate roller stand and the roller conveyor to replace the die.

In the die roller system, a pair of left and right cantilevered die rollers is detachably or rotatably provided on the front wall of a bolster of a press machine, and a die conveyed by an overhead traveling crane or a forklift is used as a die roller. After mounting on the die, the die is transferred to the bolster via this die roller. For example, in Japanese Utility Model Laid-Open No. 58-2504, a locking block is fixed to a front wall portion of a bolster, and a base end portion of a die roller is detachably locked to the locking block so that the die roller is in front of a bolster. A die roller configured to extend in a cantilevered manner is described, and in Japanese Utility Model Laid-Open No. 59-10928, the base end of the die roller is rotatably and locked to a support block on the front wall of the bolster. There is described a die roller configured to be lockably connected by a mechanism, configured to extend the die roller in a cantilever manner forward of the bolster, and configured to rotate the die roller 90 degrees downward when the die roller is not used. Further, in this type of die roller, there is one in which the free end side is supported by one fixed support column.

[0004]

[Problems to be solved by the device]

 Since the die roller needs to be removed during the pressing work after the die replacement because it interferes with the pressing work, the die roller described in the above publication is configured so that the die roller can be removed or folded. By the way, there is a problem in that it is not desirable in terms of safety to convey a large die by a cantilever type die roller. Therefore, in the case of providing one fixed support pillar for supporting the free end portion of the die roller, there is a problem in that the die roller cannot be removed or folded, which interferes with the pressing work. When exchanging the die with the die roller, it is common to manually push the die placed on the die roller to transfer it onto the bolster, but with a large die, push it manually. There is also the problem that it takes a lot of effort to move. An object of the present invention is to provide a mold exchanging device for a press machine that can safely convey a large mold and does not hinder the press work.

[0005]

[Means for Solving the Problems]

 A mold exchanging device for a press machine according to claim 1, wherein the die exchanging device for exchanging the die of the press machine is a direction orthogonal to a die conveying direction at the time of exchanging the die on the front floor of the press machine. A pair of rails extending in the (left-right direction) is provided, and a pair of left and right transporting devices having a plurality of rollers for transporting the mold in the mold transporting direction and a frame supporting the rollers are provided. Each of the pair of left and right conveying devices is provided with a plurality of idler wheels rolling on each rail and a pair of leg portions for supporting the idler wheels to prevent falling, and the pair of left and right conveyers is provided. The level of the transport surface of the transport device is almost the same as that of the bolster surface of the press machine.

According to a second aspect of the present invention, there is provided a die exchanging device for a press machine according to the first aspect, further comprising a lock mechanism for locking each conveying device at a predetermined position for exchanging a die. According to a third aspect of the present invention, there is provided a die exchanging device for a press machine according to the second aspect, wherein each conveying device is provided with a push-pull device for moving and driving the die in the die conveying direction. A die exchanging device for a press machine according to a fourth aspect is the device according to the first aspect, which is a push-pull device that moves and drives the die in a die conveying direction between a pair of left and right conveying devices. Is a push-pull device that can move independently on a pair of rails.

[0007]

[Action]

 In the die exchanging device for a press machine according to claim 1, each of a pair of left and right independent transporting devices rolls on a pair of rails extending in the left-right direction on the front floor of the press machine. Since it has a plurality of idler wheels and a pair of legs for supporting the idler wheels to prevent them from falling, the pair of left and right conveyors can move independently on the rail in the left-right direction. The level of the transport surface of the plurality of rollers of both transport devices is approximately the same as that of the bolster surface of the press machine. During the pressing operation, both transfer devices are retracted from the work space in front of the press machine, the transfer device on the left side is retracted to the left and the transfer device on the right side is retracted to the right, or both transfer devices are moved to the left or right. Since it can be evacuated together, it does not interfere with the pressing work.

When exchanging the molds, the used molds on the bolster are moved to both the transfer devices in a state where both the transfer devices are moved to the predetermined exchange positions on the front side of the press machine, and then the molds are carried out by a crane or the like. Then, another mold can be placed on the plurality of rollers of both the transfer devices and moved to the bolster via both the transfer devices. Since the transfer device is equipped with legs for preventing falls, there is no risk of falling, and since the transfer device is supported at both ends on a pair of rails via a pair of legs, it is possible to use a large mold. Can be safely transported. Moreover, since the interval between the two transfer devices can be set freely, the interval between the transfer devices can be set freely according to the size of the mold, so that even a large mold can be efficiently transferred by a small mold. Furthermore, this mold exchanging device is applicable to die exchanging of a plurality of press machines as long as the level of the bolster surface of a plurality of press machines is common, which is advantageous in terms of equipment economy.

In the mold exchanging device according to the second aspect, since the lock mechanism for locking each conveying device at a predetermined position for exchanging the mold is provided, movement of the conveying device during mold conveyance is prevented, The safety of the mold replacement work can be improved. In the mold exchanging device according to claim 3, each of the conveying devices is provided with a push-pull device that drives the mold to move in the mold conveying direction. Therefore, at the time of exchanging the mold, the push-pull device automatically or semi-automatically. The mold can be moved dynamically. According to a fourth aspect of the present invention, there is provided a mold exchanging device, which is a push-pull device that drives a mold between a pair of left and right conveying devices to move in a mold conveying direction, the pair of rails being independent of the conveying device. Since the push-pull device that can move above is provided, the mold can be moved automatically or semi-automatically by the push-pull device when changing the mold.

[0010]

[Effect of the device]

 According to the present invention, the following effects can be obtained, as described in the above-mentioned action section. A mold exchanging device for a press machine according to claim 1, wherein a pair of rails, a pair of conveying devices including a plurality of rollers and frames, a pair of leg portions of each conveying device, and each leg portion. Since it is equipped with multiple rolling wheels supported by, it can be retracted to a position away from the front side of the press machine during press work so that it does not interfere with the press action and it prevents falling. Since it has legs, it does not fall over and both ends are supported on a pair of rails, so that large molds can be safely transported and can be freely transported according to the size of the mold. The effects such as the ability to set the inter-device interval can be obtained. Furthermore, this mold exchanging device is applicable to die exchanging of a plurality of press machines as long as the level of the bolster surface of a plurality of press machines is common, which is advantageous in terms of equipment economy.

According to the mold exchanging device of the second aspect, since the lock mechanism for locking each conveying device to a predetermined position for exchanging the mold is provided, the movement of the conveying device during the conveying of the mold is prevented. As a result, the safety of the mold replacement work can be improved. According to the mold exchanging device of claim 3, since each of the conveying devices is provided with the push-pull device for moving and driving the mold in the mold conveying direction, the automatic operation is performed by the push-pull device at the time of exchanging the mold. Semi-automatically move the mold efficiently. According to the mold exchanging device of claim 4, there is provided a push-pull device for driving the mold between the pair of left and right conveying devices in the mold conveying direction, the pair of lathes being independent of the conveying device. Since a push-pull device that can move on the mold is provided, the mold can be moved automatically or semi-automatically by the push-pull device when the mold is replaced.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The mold exchanging device for a press machine according to the present embodiment carries in a mold used in a press machine for press-molding a metal plate onto a bolster of the press machine, or carries out a used mold from the bolster. It is meant to be used. As shown in FIGS. 1 and 2, in order to carry in and out the mold 3 that is fixed to the bolster 2 of the press machine 1 and used for press molding, the mold is transferred onto the floor 4 on the front side of the press machine 1. A pair of front and rear rails 5 and 6 having a predetermined length extending in a direction orthogonal to the direction (horizontal direction) are provided, and a pair of left and right independent transport devices movable on the pair of rails 5 and 6. 10 are provided.

The pair of left and right transfer devices 10 has a symmetrical structure, and with respect to each transfer device 10, the frame 11 of the transfer device 10 includes two vertical plate members that extend in the mold transfer direction. The rear end of the frame 11 extends rearward from the rear rail 5 to a position near the front end of the bolster 2, and the front end of the frame 11 is connected to each other. It extends a predetermined length forward of the front rail 6. At a position corresponding to the pair of front and rear rails 5 and 6, a pair of front and rear legs 12 having a predetermined length in the left-right direction and oriented in the same direction as the rails 5 and 6 are provided at a lower end portion of the frame 11. Each leg 12 is firmly fixed to the frame 11 by a pair of left and right reinforcing members 13 in the upright direction, and the upper end of the frame 11 is arranged at small intervals in the mold conveying direction. 1 is a plurality of idler rollers 14 that can be conveyed in the front-rear direction, and the conveying surface of the conveying roller 17 of the die lifter 16 mounted on the T groove 15 of the bolster 2 (this is the upper surface of the bolster 2). A plurality of idler rollers 14 having a transport surface at the same level as the height level of the neighborhood height) are provided.

A pair of rolling wheels 18 and 19 capable of rolling on the corresponding rails 5 and 6 are provided at portions near both ends of each leg portion 12, and the conveying device 10 has a pair of front wheels. It is supported by a pair of rails 5 and 6 so as to be movable in the left-right direction by a rolling wheel 18 and a pair of rear rolling wheels 19. Here, the rolling wheel 18 provided on the rear leg portion 12 is a rolling wheel with a collar, and the rear rail 5 is formed in a convex shape in cross section into which the rolling wheel 18 with a collar fits. As a locking mechanism 20 for locking the pair of left and right conveying devices 10 at a predetermined position (position shown by a solid line in FIG. 1) for exchanging the mold 3, the left and right ends of each leg 12 are provided. The vertical pin holes 21 are formed, and the vertical pin holes 22 corresponding to the pin holes 21 are formed in the rails 5 and 6, and the pin members 23 are formed in the corresponding pin holes 21 and 22, respectively. It is configured to lock so that it cannot be moved by fitting. However, when the small mold 3 is conveyed, the interval between the pair of left and right conveying devices 10 is set to be small, and the pin holes 22 corresponding to the pin holes 21 when the interval is set to be small are also provided. Has been.

Push-pull devices 30 for reciprocating and driving the mold 3 in the mold conveying direction are attached to the side surface portions of the frames 11 of the pair of left and right conveying devices 10 that face each other. For each push-pull device 30, the guide member 31 of the push-pull device 30 has the same length as the frame 11 and is fixed to the side surface portion of the upper end of the frame 11, which is shown in FIG. Thus, the inverted T-shaped T groove 32 is formed. A driving box 34 having a T groove 33 continuous with the T groove 32 is provided at the front end of the guide member 31, and as shown in FIG. At the same position, a sprocket 36 supported by a support shaft 35 oriented in the left-right direction is provided, and an electric motor (not shown) for driving the sprocket 36 in forward and reverse directions is provided in the drive box 34 and housed in the drive box 34. The assembled chain 37 is led out to the T groove 33 via the sprocket 36, and the end portion of the chain 37 is fixed to the front end of the leg portion 39a of the carriage main body 39 of the carriage 38. Each connecting pin is provided with a pair of rollers 40 that roll in the lateral groove portion 32a below the T grooves 33 and 32.

The carriage body 39 has an inverted T-shaped leg portion 39a slidably movable in the T-grooves 33 and 32, a pair of left and right brackets 39b, and a horizontal direction in the left-right direction on the brackets 39b. An arm member 42 pivotally attached to the tip end side through a pin 41 so as to be vertically swingable, and an arm member 42 having a hook portion 42a at the tip end portion is provided. When the sprocket 36 is driven to rotate and the chain 37 is extended, a plurality of rollers 40 on the left and right sides of the chain 37 move in the lateral groove portions 32a of the T grooves 33 and 32, so that the chain 37 moves along the T groove 32. The carriage 38 moves rearward along the guide member 31, and when the chain 37 is wound up, the carriage 38 is moved rearward along the guide member 31 by the chain 37. It is supposed to do. A pair of left and right engagement members 43 for engaging the hook portions 42a of the arm members 42 of the pair of left and right push-pull devices 30 are provided at the front end of the lower end portion of the mold 3.

The operation of the mold exchanging device will be described. When the mold 3 shown in FIG. 1 is to be replaced, the transfer device 10 on the left side is manually moved from the retracted position shown by the virtual line on the left to the predetermined mold replacement position shown by the solid line, and Move the transport device 10 on the right side from the retracted position shown by the imaginary line on the right side to the predetermined exchange position shown by the solid line, and make the pin holes 21 of each leg 12 coincide with the corresponding pin holes 22 so that each pin The pin member 23 is fitted into the hole 21 and the corresponding pin hole 22 to lock the transporting device 10. Next, when the motors that drive the sprockets 36 of the pair of left and right push-pull devices 30 are driven in the forward direction to drive the carriage 38 toward the press machine 1 via the chain 37, a pair of Each hook portion 42a is engaged with the engaging member 43 of the mold 3 by the guiding action of the inclined guide surface 42b below the tip of the hook portion 42a. At that point, when the motor is switched to the reverse drive, the pair of left and right carriages 38 move forward, and the mold 3 moves forward through the pair of left and right arm members 42 and their hooks 42a. To be done. When the mold 3 has moved to a predetermined position on the left and right transfer devices 10, the motor is stopped and the hook portions 42a of the left and right arm members 42 are disengaged from the engaging members 43 of the mold 3, The motor is driven in the reverse direction again, and the motor is stopped when the left and right carriages 38 move to the front limit positions on the respective drive boxes 34.

In this state, the used mold 3 is carried out to the outside by an overhead crane or the like, and then the mold 3 to be used is carried into the left and right carrier devices 10, and the left and right carriages 38 are moved to the mold. When the mold 3 is moved through the arm member 42 by the left and right carriages 38 while the tip end surface of the arm member 42 is in contact with the front end surface of the mold 3 behind the engagement member 43, the mold 3 is moved toward the mold 3 through the arm member 42. After being conveyed to the press machine 1 and the mold 3 is conveyed to a predetermined position on the bolster 2, the motor is stopped and the hook portions 42a of the left and right arm members 42 are disengaged from the engaging members 43. The left and right carriages 38 are returned to the front limit positions on the respective drive boxes 34.

Next, after pulling out a total of eight pin members 23, manually move the left carrier device 10 to the left retracted position and the right carrier device 10 to the right retracted position, respectively, and press. Keep it in the retracted position during work. The front end and the rear end of the mold 3 conveyed to a predetermined position on the bolster 2 are fixed to the ballster 2 by two sets of clamp devices 44. This clamp device 44 is provided with an engaging portion that engages with the lateral groove portion of the T groove 15 of the bolster 2 at the lower end portion of the rod of the inverted hydraulic cylinder. 3 is fitted into the notch groove 45 and the T groove 15 of the collar-shaped portion 3 a of the mold 3 from the front or the rear side, and then hydraulic pressure is supplied to the hydraulic cylinder to clamp the rod toward the mold 3 to drive the mold 3 Is fixed to the bolster 2.

As described above, since the transfer device 10 is supported at both ends by the pair of front and rear legs 12, it is possible to safely transfer the large mold 3, and each leg 12 has a predetermined horizontal direction. Since the legs 12 have a length and the rolling wheels 18 and 19 are provided at the left and right ends of each leg 12, the carrier device 10 can be prevented from falling through the pair of front and rear legs 12. Moreover, since each of the transfer devices 10 is configured to be independently movable in the left-right direction on the pair of front and rear rails 5 and 6 extending in the left-right direction, the transfer devices 10 are not moved during the press work. Since it can be retracted to the retracted position retracted from the work space on the front side, it does not hinder the press work. However, the left and right conveying devices 10 can be moved closer to each other and retracted to the left or right retracted position, if necessary. If the pair of front and rear rails 5 and 6 are extended over the front side of the plurality of press machines 1, the pair of transfer devices 10 can be used for exchanging the dies 3 of the plurality of press machines. It is possible. The front and rear rails 5 and 6 may be provided so that their upper end surfaces are flush with the surface of the floor 4 so as not to interfere with the pressing work.

First Alternative Embodiment ... See FIGS. 4 to 8 Next, a mold exchanging apparatus according to another embodiment will be described. However, the constituent elements that are substantially the same as those in the above-described embodiment are designated by the same reference numerals as those in the above-described embodiment, the description thereof is omitted, and only different configurations will be described. Base plates 50 are provided on the left and right halves of the front floor 4 of the press machine 1, and a pair of front and rear rails 5 and 6A extending in the left-right direction are fixedly mounted on each base plate 50. A transfer device 10A is provided which is movable on the pair of rails 5 and 6A in the left-right direction. Each transfer device 10A includes a frame 11 extending in the mold transfer direction, a plurality of idler rollers 14 provided at the upper end of the frame 11, and a pair of front and rear having a predetermined length in the left-right direction. The legs 12, the rolling wheels with flanges provided on the left end and the right end of each leg 12 and rolling on the rails 5 and 6A, and the left and right end parts of each leg 12 It is composed of a lock mechanism 20A for locking.

With respect to the lock mechanism 20A, an inverted air cylinder 51 (or hydraulic cylinder) is provided at the end of the leg portion 12 instead of the pin member 23, and the rod 51a of the air cylinder 51 is connected to the pin holes of the rails 5 and 6A. It is configured such that each of the transfer devices 10A is locked at a predetermined mold exchange position by being fitted into the die 22. Since the rolling wheel is a rolling wheel with a collar, the front and rear rails 5 and 6A are formed in a convex shape in cross section, and the rails 5 and 6A have end portions for locking the transfer device 10A at the retracted position. The pin hole 22 is also formed. The left and right transfer devices 10A are locked at the positions shown in FIG. 4 when the die 3 is replaced, and the left transfer device 10A is locked at the left end of the rails 5 and 6A during the pressing operation. The transport device 10A on the right side is locked at the retracted position of the right ends of the rails 5 and 6A. In place of the air cylinder 51 of the lock mechanism 20A, pin members 52 as shown in FIG. 8 are provided at both ends of the leg portion 12, and the pin members 52 are fitted into the pin holes 22 of the rails 5 and 6A. You may comprise.

For reference, if the base plate 50 is not fixed to the floor 4, the base plate 50 and the rails 5 and 6A and the transfer device 10A mounted on the base plate 50 can be transported by an overhead crane or the like. It is also possible to move it to the floor 4 on the front side of another press machine 1 and use it for replacing the mold 3 in the press machine. The operation of the mold exchanging device is substantially the same as that of the mold exchanging device except that the action of the push-pull device 30 cannot be obtained, and thus the description of the operation will be omitted.

Here, a modification of the mold exchanging device according to the first another embodiment will be described with reference to FIGS. 9 and 10. The pair of front and rear rails 5A in this mold exchanging device are continuously extended over the front side of a plurality of press machines 1, and the pair of left and right transfer devices 10B are the transfer devices of the first alternative embodiment. Although the structure is substantially similar to that of the device 10A, the guide column members 13A erected from the respective leg portions 12 are formed in a U-shaped cross section, and both ends of the frame 11 are engaged with the front and rear guide column members 13A, respectively. The upright engaging projections 11a provided on both left and right sides of each end of the frame 11 are vertically movably engaged with the upright guide grooves 60 of the corresponding guide pillar member 13A. An upright air cylinder 61 (or hydraulic cylinder) is provided on the leg 12 below each end, and the end of the frame 11 is supported by the upper end of the rod 61a of the air cylinder 61. 61 of the frame 11 Are positioned adjustably configured position in the vertical direction is. Therefore, the pair of left and right conveying devices 10B can be used for exchanging the dies of a plurality of press machines 1, but the air cylinders 61 make it possible to match the height level of the bolsters 2 of each press machine 1. In addition, the level of the frame 11 of the carrier device 10B can be adjusted.

Second alternative embodiment ... See FIG. 11. The mold conveying apparatus of this embodiment is similar to the first alternative embodiment in that a pair of front and rear rails 5 and 6A are continuous and a first alternative embodiment. The transport device 10A includes a pair of left and right transport devices 10A similar to the transport device 10A, and a push-pull device 30A disposed between the transport devices 10A. The push-pull device 30A will be described. The push-pull device 30A is independent of the transport device 10A, and its guide member 31A is composed of a member having a height higher than that of the guide member 31. The front and rear ends of 31A are provided with a pair of front and rear legs 12A similar to the legs 12 of the carrier device 10A, and the push-pull device 30A has a pair of front and rear rails 5, 6 similar to the carrier device 10A. It is constructed so that it can move left and right on A.

Similar to the push-pull device 30, the push-pull device 30A is provided with a carriage 38 movable along the interior 31A and a drive box 34. As shown in FIG. 11, the push-pull device 30A is locked at an intermediate exchange position between the left and right transfer devices 10A, and the push-pull device 30A pushes or pulls the mold 3 by one push-pull device 30A. Is configured. Each leg 12A is provided with a pair of left and right rolling wheels similar to the rolling wheel 18, and the front and rear legs 12A are provided with air cylinders 51 included in a lock mechanism. In this mold exchanging device, during the pressing operation, the left-side transfer device 10A is stopped at the right-side retracted position and is kept in the locked state, and the right-side transfer device 10A and the push-pull device 30A are right-side retracted. It is stopped in the position and kept locked. However, the push-pull device 30A may be stopped at the left retracted position. In each of the transfer devices 10, 10A, 10B of the mold exchanging device, the front and rear legs 12, 12A are provided with electric motors for rotationally driving one rolling roller and self-propelled by the driving force of those motors. It can also be configured as follows.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a mold exchanging device according to an embodiment.

FIG. 2 is a vertical cross-sectional view of a part of a drive box and a guide member.

FIG. 3 is a vertical sectional view of a guide member.

FIG. 4 is an overall perspective view of a mold exchanging device according to a first alternative embodiment.

5 is an enlarged perspective view of the transfer device shown in FIG.

6 is a vertical cross-sectional view of a bolster of the press machine of FIG. 4 and a rear end portion of a transfer device.

7 is a front view of one transfer device of the mold exchanging device of FIG. 4. FIG.

FIG. 8 is a cross-sectional view of a modified lock mechanism.

FIG. 9 is a plan view of an essential part of one transfer device of a modified example of the mold exchanging device of the first alternative embodiment.

10 is a cross-sectional view of main parts of the transport device of FIG.

FIG. 11 is an overall perspective view of a mold exchanging device according to a second alternative embodiment.

[Explanation of symbols]

 1 Press Machine 2 Bolster 3 Mold 4 Floor 5, 5A, 6, 6A Rail 10, 10A, 10B Conveyor 11 Frame 12, 12A Leg 14 Rotating Roller 20, 20A Lock Mechanism 21 Pin Hole 22 Pin Hole 23, 52 Pin member 30, 30A Push-pull device 31 Guide member 34 Drive box 36 Sprocket 37 Chain 38 Carriage 42 Arm member 51 Air cylinder

Claims (4)

[Scope of utility model registration request] 1. A mold exchanging device for exchanging dies of a press machine, comprising a pair of pairs extending on a floor on the front side of the press machine in a direction (horizontal direction) orthogonal to a die conveying direction during die exchange. And a pair of left and right independent transfer devices having a plurality of rollers for transferring the mold in the mold transfer direction and a frame supporting the rollers, and the pair of left and right transfer devices. A plurality of idle wheels rolling on each rail and a pair of legs for preventing the falls which support these idle wheels, and the level of the carrying surface of the pair of left and right carrying devices. The die changer for a press machine is characterized in that is configured to be approximately the same level as the bolster surface of the press machine. 2. The mold exchanging device for a press machine according to claim 1, further comprising a locking mechanism for locking each conveying device at a predetermined position for exchanging the mold. 3. The mold exchanging device of a press machine according to claim 2, wherein each of the conveying devices is provided with a push-pull device for moving and driving the mold in the mold conveying direction. 4. The push-pull device according to claim 1, which is a push-pull device for moving and driving a mold between a pair of left and right conveying devices in the mold conveying direction, the pair of rails being independent of the conveying device. A die exchanging device for a press machine, which is provided with a push-pull device capable of moving.