JPH06190449A - Metallic die exchange device for metal plate bending machine - Google Patents

Abstract

PURPOSE:To select the number of thin wall segmental dies by a simple constitution which does not require any high cost driving part such as a servo motor. CONSTITUTION:A part of an upper die 2 consists of plural thin wall segmental dies 19 arranged in the width direction of a die and edge dies 20. The dies 19 and 20 are provided on a bouncing rotating shaft 45 freely rotatably between working positions and bounced positions. The bouncing shaft 45 and the dies 19 and 20 are engaged with each other in the rotating direction by a die number selecting key 45 which is movable in the shaft direction. The key 45 is driven back and forth by a transfer screw 52 and the lead of the screw 52 is dimensioned so as the key 45 is moved back and forth by a thickness of one of the dies 19 by one rotation of a motor 55. The upper die 2 is also provided with plural thick wall segmental dies and a fixed center die, etc., other than the dies 19 and 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold exchanging device for a plate bending machine, such as a folding machine and a press brake, which can change the mold width according to the bending width of the plate.

[0002]

2. Description of the Related Art In electrical appliances and cabinets used in various other products, rectangular plate materials having four sides bent into a U-shape or a Z-shape are used. In order to bend the plate material in this way, usually, after bending the short side edge portion of the plate material cut to a predetermined size, the plate material is turned in a plane to bend the long side edge portion. When bending the long side edge, there is a rising piece on the short side edge that has already been bent.Therefore, when the size of the plate material is changed, the upper die should have a width that does not interfere with the rising piece. You need to change the width.

Conventionally, as a mold exchanging device for automatically changing the die width of such an upper die, the upper die is composed of a large number of divided dies arranged in the die width direction, and an arbitrary number of divided dies are formed. There are various proposals for selecting and arranging at a use position. For example, there is a method in which a plurality of thin-wall split dies are provided in the center, thick-wall split dies are provided on both sides, and the die width of the upper die is changed by selecting the number of these thin-wall split dies and thick-wall split dies.

[0004]

However, in any of the mold exchanging devices, the mechanism for selecting the split mold and the control system have a complicated structure and a large number of expensive servomotors are required. .

An object of the present invention is to provide a mold exchanging device for a plate bending machine which does not require expensive driving parts such as a servo motor and can select the number of thin-walled split molds with a simple structure. is there.

[0006]

A mold exchanging device for a plate material folding machine according to the present invention comprises a plurality of thin-walled split molds, each of which has a part of an upper die, arranged in the mold width direction, and these thin-walled split molds are jumped. It is installed on the lifting rotary shaft so as to be rotatable between the use position and the jumping position. The rotary shaft for jumping up and the thin-walled split mold are engaged with each other in the rotation direction by a mold number selection key that is movable in the axial direction. The mold number selection key can be moved forward and backward by a feed screw that moves forward and backward by the thickness of one thin-walled split mold by one rotation of the motor.

According to a second aspect of the present invention, there is provided a mold exchanging device which is provided with an elastic locking mechanism which elastically engages the thin-walled split mold at the flip-up position.
The thin-walled split type is adapted to prevent downward rotation.

[0008]

According to this structure, by rotating the hoisting rotary shaft, only the thin-walled split mold engaged with the die number selection key rotates together with the hoisting rotary shaft, and the number of thin-walled split molds to be used is selected. It The number-of-molds selection key is advanced and retracted by the rotation of the motor via the feed screw, and the number of engaging with the thin-walled split mold is changed. In this case, the lead screw is
Since the lead is used to move the die number selection key for one thin-walled divided die by rotation, the motor control system only needs to be capable of recognizing one revolution, and an expensive servomotor is not required.

According to the second aspect of the invention, the unnecessary thin-walled split mold is held by the elastic locking mechanism at the jumping position, and only the thin-walled split mold selected by the die number selection key is rotated down to the use position. . In this way, since the unnecessary thin-walled split mold can be held at the flip-up position by the elastic locking mechanism, a mechanism for holding the unnecessary thin-walled split mold at the flip-up position can be added to the mechanism for rotating the thin-wall split mold. Since it is not necessary to provide it, the structure for selecting the number of molds is simplified.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. As shown in the side view of FIG. 3, the folding machine body 1 of this plate folding machine includes an upper mold 2 and a lower mold 3 for sandwiching the plate W up and down, and protruding portions of the plate W from the upper and lower molds 2 and 3. W1
And a bending die 4 for bending the above. The lower die 3 is fixed to the body frame 5. Upper mold 2
Is attached to a ram 7 via a mold changer base (hereinafter referred to as “ATC base”) 6, and a lifting cylinder 8
Is driven up and down together with the ram 7. The bending die 4 is attached to the tip of the rocker arm 9. The rocker arm 9 is supported so as to be vertically swingable about an eccentric support shaft 10,
By the cylinder for vertical drive and the cylinder for rotation of the eccentric support shaft 10 (neither of which is shown), vertical swing and slight vertical and forward / backward movement are possible. The mold width of the upper mold 2 can be freely changed by the mold changing device 11.

In front of the folding machine main body 1, there is installed a plate material feeding device 13 for sandwiching the center of the plate material W between the upper and lower rotary pads of the rotary clamp 12 and inserting / removing it between the upper and lower molds 2, 3. The rotary clamp 12 is for indexing and rotating the plate material W in a horizontal plane, and is provided on the carriage 15 which is driven forward and backward on the rail 14 of FIG. Work tables 16 on which the plate material W held by the rotary clamps 12 are placed are installed on both sides of the carriage 15 in the front-rear movement path.

The structure of the mold exchanging device 11 will be described. Figure 2
As shown in FIG. 3, the upper mold 2 includes a central mold 17 arranged at the center in the mold width direction, a plurality of thick-walled divided molds 18 arranged on both sides thereof, and thin-walled divided molds 19 arranged on both sides thereof.
And the end die 20 at both ends. Central type 17
Is composed of a pair of split central dies 17a and 17b, and a thin central die 17c interposed between the split central dies 17a and 17b so as to be able to move in and out. An open die 21 is attached to the end die 20 so as to be rotatable around a support shaft 22. The open die 22 usually hangs down in an inclined posture as shown by a chain line, and when the plate material W is pressed down, it spreads laterally at a horizontal angle as shown by a solid line. Each thick wall split mold 18
In this embodiment, the thickness is 50 mm. Thin wall type 1
9 is formed with a thickness of 5 mm, which is 1/10 of that thickness, and 9 sheets are provided on each side. The thin central mold 17c is also formed to have the same thickness as the thin split mold 19 with a thickness of 5 mm.

Each of the thick-walled split molds 18 has a guide roller 23 at the upper end thereof, and is suspended by a split mold support rail 24 provided on the ATC base 6 of the ram 7 so as to be movable in the mold width direction. The split-type support rail 24 and the guide roller 23 form a split-type guide mechanism 29. Each thick wall type 18
A pin engaging hole 25 for moving operation is provided on the front surface of the.

The end die 20 and the thin-walled split die 19 are installed on a die installation slide body 26 through a hoisting mechanism 27, and the die installation slide body 26 is a lower rail 28 provided on the ATC base 6. Is installed so that it can move back and forth in the mold width direction via a linear motion bearing. A mold connecting mechanism 30 for connecting the thick-walled split mold 18 to the center side end of the mold installation slide body 26.
Is installed via a support 31, and an unnecessary movement preventing device 40 is provided on the opposite side.

The mold connecting mechanism 30 drives the connecting pin 32 (FIG. 7) which is inserted into and removed from the pin engaging hole 25 of the thick-walled split mold 18 by an air cylinder 33 to move back and forth. The unnecessary die movement preventing device 40 presses the die 18 at the inner end of the row of the thick-walled split dies 18 at the side standby position T to prevent movement.
The pressing pad 40a (FIG. 4) made of urethane or the like and the pressing cylinder 40b are used.

In FIG. 2, the mold installation slide body 26 is
The U-axis servo motor 3 is connected to the advancing / retreating moving member 35 driven by the feed screw 34 through a pin joint 36.
By the rotation of 7, the forward / backward movement member 35 is driven forward / backward. The advancing / retreating movement member 35 is movably supported by an upper guide rail 38 installed on the ram 7 via a linear bearing.
The ball nut 39 is screwed onto the feed screw 34. The feed screw 34 is rotatably supported by a ram 7 by bearings, and both side portions 34a and 34b with respect to the center of the mold width are formed as reverse screws, and are rotationally driven by a U-axis servomotor 37 via a timing belt 41. To be done. Therefore, the mold installation slides 26, 26 on both sides are driven in a perspective manner in synchronization with each other. The die mounting slide body 26, the advancing / retreating moving member 35, and the pin joint 36 constitute the end die moving mechanism 4
3 are configured.

The pin joint 36 is formed by engaging the joint pin 36a with the engaging groove 42a in the front-rear direction of the non-engaging member 42 (FIG. 4) provided on the die mounting slide body 26. Between the pin 36a and the engaging groove 42a, the feed screw 3 for adjusting the protruding amount (front and rear position) of the blade tip 2a of the upper die 2 is provided.
The positional deviation between the front and the rear (in the direction of arrow d) with respect to 4 is absorbed, and the smooth movement of the mold installation slide body 26 is ensured.

FIG. 5 shows the structure of the hoisting mechanism 27. A hollow flip-up rotating shaft 45 is rotatably supported by a bearing 46 on the die mounting slide body 26 via a pair of supports 31 and 44, and a driven gear 47 is fixed to one end thereof. The driven gear 47 meshes with the drive gear 50 of the hoisting drive device 49 (FIG. 4) via the idle gear 48, and the hoisting drive device 49 drives the hoisting drive shaft 49 to rotate the hoisting rotation shaft 45 forward and backward at a predetermined angle. Is rotated. As shown in FIG. 5, the upper end of the end die 20 and each of the thin-wall split dies 19 is rotatably fitted to the hoisting rotary shaft 45. The end die 20 and each thin wall split die 19 are engaged with the hoisting rotation shaft 45 via the die number selection key 51 so as to be rotatable.

The die number selection key 51 is used for the hoisting rotary shaft 4.
A nut portion 51a is screwed into a feed screw 52 in the movable portion 5 to move back and forth.
5 penetrates the key moving slit 53 and engages with the key groove of the end die 20 and each of the thin-wall split dies 19. Lead screw 52
Is rotatably supported by the bearing 54 in the hoisting rotary shaft 45, and is connected to the hoisting motor 55 installed on the die mounting slide body 26 via a shaft coupling 56.

Therefore, by rotating the hoisting motor 55 to move the die number selection key 51 forward and backward, the number of thin-walled split dies 19 that engage with the key 51 is selected. The thin-walled split mold 19 and the end mold 20 that are engaged with each other are rotated 180 degrees between the use position P and the jumping position Q shown in FIG. 4 by driving the jumping driving device 49. The lead of the feed screw 52 (FIG. 5) is set to a dimension such that the die number selection key 51 moves by one revolution by the thickness of one sheet of the thin-walled split die 19. Therefore, by rotating the hoisting motor 55 once, it is possible to select one thin-walled split mold 19. As the hoisting motor 55, it is not necessary to use an expensive servo motor, and a normal DC motor or the like is used.

The hoisting motor 55 has a motor shaft 5
A rotation detector 5 for detecting that the rotation phase of 5a is zero.
7 is provided. Further, in the end die 20, the origin detection switch 58, which is a proximity switch for detecting that the die number selection key 51 is at the origin position (position for selecting all the sheets)
Is provided. Further, the end die 20 is provided with an opening die separating mechanism 59 composed of a push-down pin and a spring member so that the opening die 21 does not come into close contact with the engaging surface with the end die 20 when it is pressed against the plate material. Is prevented.

The above-mentioned hoisting drive device 49 (FIG. 4) is
A screw type straight / rotation conversion mechanism 61 and a cylinder device 60 for moving the screw shaft 61a thereof forward and backward are provided, and the drive gear 50 is rotationally driven via a nut 62 by the forward and backward movement of the screw shaft 61a. By using the cylinder device 60 as a drive source in this way, the hoisting mechanism 27 has a compact structure, and interference with the plate material feeding device 13 (FIG. 3) or the like is less likely to occur.

FIG. 8 shows an elastic locking mechanism 63 for holding the thin-walled split mold 19 at the flip-up position Q so as not to rotate due to its own weight or the like. The elastic locking mechanism 63 is provided in the advance / retreat moving member 35.
The locking mechanism main body 64 provided in (FIG. 2) and the locking pin 66 whose lower end engages with the locking recess 65 of each thin-walled split mold 19.
And a protruding biasing spring 67 for the locking pin 66. The locking pin 66 and the spring 67 are provided on the locking mechanism main body 64.
It is accommodated in the accommodating hole 68 formed in the above, and can be lowered to a position where the enlarged diameter head portion of the locking pin 66 is engaged with the step portion in the accommodating hole 68. Locking pin 66 corresponding to each thin wall split mold 19
Is so that it can be installed within the thickness dimension of the thin split mold 19,
The thin-walled split molds 19 are alternately arranged such that the positions thereof are shifted forward and backward.

According to this elastic locking mechanism 63, each thin-walled split mold 19 at the jumping position Q is elastically held in position by the locking pin 66, and is engaged with the mold number selection key 51 shown in FIG. Only the thin-walled split mold 19 that is driven dynamically has the locking pin 66.
Is disengaged from the elastic locking force and is rotated downward to the use position P. Thin wall split mold 19 returned to the jumping position Q
Are again engaged with the locking pin 66 and held.

FIG. 9 shows a thick-walled split mold 18 and a central mold 17.
FIG. In the thick-walled split mold 18, a roller support member 69 that rotatably supports the guide roller 23 is detachably attached with a set screw 70, and the upper shoulder surface 18a.
However, the pressing force is applied when the ram 7 descends in contact with the lower surface of the split type support rail 24 (FIGS. 2 and 4) that supports the guide roller 23 on the upper surface. In this way, since the guide roller 23 is detachably attached to the thick-walled split mold 18, the thick-walled split mold 1 is provided.
Only the thick-walled split mold 18 that needs to be replaced can be removed when 8 is damaged, and maintenance can be easily performed.

Both central molds 17a, 17b of the central mold 17
Similarly to the thick-walled split mold 18, a guide roller 71 is detachably attached by a set screw 73 via a roller support member 72, and is suspended on the split mold support rail 24.
As a result, it is possible to open and close the gap for disposing the thin central mold 17c (FIGS. 10 to 13) between the split central molds 17a and 17b. The dividing line M is composed of two divided central molds 17.
The division | segmentation surface position of a, 17b is shown. The split center mold 17
The movable range of a and 17b is regulated by the central stopper 80 fixed to the ATC base 6. One split central mold 17b contains a central mold opening / closing cylinder 74 which is a central mold opening / closing device, and is connected to the other split central mold 17a by a piston rod 74a. Further, a thin central type advancing / retreating cylinder 75, which is a thin central type advancing / retreating device, and an opening / closing confirmation proximity switch 76 are installed on the split central die 17a via a support 77.

As shown in FIG. 11, a thin central mold 17c
When not required, it is housed in a recess 78 provided on the split surface of one of the split central dies 17b, and is driven to the same front and rear position as the split central dies 17a and 17b by driving the thin central dies moving cylinder 75. Further, as shown in FIG. 13, the thin central mold 17c is formed to be lower than the divided central molds 17a and 17b, and the upper end surface of the thin central mold 17c engages with the pressure locking surface 79 formed on the divided surface of the divided central mold 17a. As a result, it is possible to receive a pressing force when the ram 7 descends. Note that FIG.
In FIG. 3 and FIG. 3, reference numeral 81 denotes a cable bear connected to the mold setting slide body 26, and 82 denotes its support.

The operation of exchanging the mold having the above structure will be described. Figure 1
FIG. 4 is a pattern diagram of a mold replacement state. FIG. 3A shows a state in which the die width L is set to the longest. When changing the mold width in 100 mm units, only the thick-walled dividing mold 18 is selected as shown in FIG. When changing in units of 10 mm, the number of thick-walled split dies 18 and thin-walled split dies 19 is selected as shown in FIG. When performing in units of 5 mm, the same figure (D)
As described above, the thin central mold 17c is selected. FIG. 6E shows a state where the mold width L is minimum.

FIG. 17 shows a flow chart of the die changing operation. An example of the mold exchanging operation of FIGS. 15 and 16 will be described with reference to FIG. Figure 15 shows the longest width (3100mm) to 625mm
The operation of narrowing the die width L to the width is shown. First, the ram 7 (FIGS. 1 and 3) is lifted from the state of the longest width in FIG. 1 (A) (step S1), and the end die 20 and all the thin-wall split dies 1 are made.
Jump up 9 (S2). After this, the thick wall split mold 1 not used
8 is unlocked by the unnecessary movement prevention device 40 (FIG. 2) (S4), and the movement axis (U axis) of the die installation slide body 26 is released.
To the in position (center side) to the desired position (S
5). That is, the unnecessary thick-walled split mold 18 is taken.
This state is the state shown in FIG. Here, the connecting pin 32 of the mold connecting mechanism 30 is engaged with the pin engaging hole 25 of the thick-walled split mold 18 (S6), and the U axis is moved to the out side (S).
7) to move the unnecessary thick-walled split mold 18 to the outside (FIG. 15C).

Thereafter, the connecting pin 32 is removed (S8), and the mold installation slide body 26 is moved to the in side as shown in FIG. 15 (D) (S9), where the mold selection key 51 (FIG. 5) is moved. Then, the thin-walled split mold 19 is selected (S10). Next, the die lowering permission signal obtained from a predetermined sensor (not shown) is confirmed (S11), and the end die 20 and the selected thin-walled split die 19 are rotated downward to the use position P (S1).
2). It should be noted that U when moving to the position of FIG. 15 (D) so that a slight gap (for example, about 10 mm) can be obtained between the thin-walled split mold 19 and the center mold 17 that have descended at this time.
Determine the axis coordinates. In this way, after the molds 19 and 20 are rotated downward, as shown in FIG.
A little to the in side to eliminate the gap (S1
3) Set the target mold width L. Then, the thick-walled split mold 18 that is not used is locked by the unnecessary mold movement preventing device 40, and the mold width changing operation is completed.

FIG. 16 shows a mold width L of 625 mm to 850 mm.
It shows the operation when spread to. From the state of the original die width of FIG. 16 (A), as described above, the ram 7 is raised and the die 19,
After the hoisting of 20 (S1, S2) is performed, the lock of the unnecessary thick-walled split mold 18 by the unnecessary mold movement preventing device 40 is released (S15), and the mold installation slide body 26 is moved to the out side ( S16) The two thick-walled split molds 18 are picked up (FIG. 16 (B)). Here, the connecting pin 32 is connected (S
17) After moving the mold installation slide body 26 inward as shown in FIG. 16C (S18), the mold selection key 51 is moved to select the number of thin-walled split molds 19 (S19). The end mold 20 and the selected thin wall split mold 19 are then shown in FIG.
6 (D), downward rotation (S20), connecting pin 3
Remove 2 (S21). Thereafter, the mold installation slide body 26 is slightly moved inward to eliminate the gap between the mold installation slide body 26 and the central mold 17 (S22), and the target mold width L is obtained as shown in FIG. 16 (E). Then, the thick-walled split mold 18 that is not used is locked by the unnecessary mold movement preventing device 40, and the mold width changing operation is completed.

In the mold exchanging device 11 of this embodiment, the end die 20 is thus of the flip-up type, and the die installation slide body 26 on which the end die 20 is installed and the thick dividing die 18 are formed. Since the pin 32 of the connecting mechanism 30 can be engaged and disengageably coupled, the movement of the end die 20 is used to select the thick-walled split dies 18 and gather them to the center, and the unnecessary thick-walled split dies 18 side. You can evacuate to one direction. Therefore, a dedicated selecting mechanism or moving mechanism for the thick-walled split mold 18 is not required, and the structure is simplified. In addition, the number of the thin-walled split dies 19 that are not used by jumping up is set to the die-selection key 51 that engages with the thin-walled split dies 19.
And the feed screw 52 for axially moving the key 51 is selected by one rotation of the motor 55.
Since the lead for feeding the thickness of one sheet is used, an expensive driving device such as a servomotor is not required, and the thin-wall split mold 19 can be selected with a simple configuration.

In the operation process shown in FIG. 17, terminals A,
In parallel with the operation between B, the die width changing operation for the central die 17 shown in FIG. 18 is performed as necessary. That is, in FIG.
After the operation of step S7 or S16, as shown in step R1 of FIG. 18, the necessity of the thin-walled central mold 17c is determined, and when the thin-walled central mold 17c is not necessary or necessary, the thin-walled central mold 17c is It is determined whether or not it is in use (R2, R6).

If the thin central mold 17c is required and is not in use, the process proceeds from step R6 to R7, as shown in FIG.
In the process shown in (1), the thin central mold 17c is moved in. That is, from the state of FIG.
b is opened by the operation of the central mold opening / closing cylinder 74 as shown in FIG. 7B (R7), and the thin central mold 17c is advanced by the thin central mold loading / unloading cylinder 75 (R8).
11a and 17b are closed as shown in FIG. 11C (R9).

If the thin central mold 17c is required and is in use, the process proceeds from step R6 to the terminal B and no operation is performed. If the thin central mold 17c is unnecessary and is in use, open the split central molds 17a and 17b (R
3) After the thin central mold 17c is withdrawn (R4), the divided central molds 17a and 17b are closed. If the thin central mold 17c is not necessary and is not in use, the process proceeds from step R2 to the terminal B and no operation is performed.

[0036]

According to the mold exchanging device of the plate bending machine of the present invention, the number of thin-walled split molds to be brought into a non-use state by jumping up is selected by a mold selection key engaged with the thin-walled split molds. The feed screw that moves this key in the axial direction is a lead that feeds the thickness of one thin-wall split type by one rotation of the motor, so an expensive drive device such as a servomotor is not required, and the thin-wall split type can be selected. It can be performed with a simple configuration.

In the case of the structure of claim 2, since the elastic locking mechanism for holding the unnecessary thin-walled split mold at the jumping position is provided,
The mechanism for selecting the thin-wall split type is further simplified.

[Brief description of drawings]

FIG. 1 is a front view of a plate material folding machine equipped with a mold exchanging device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged front view of the mold exchanging device.

FIG. 3 is a side view of the folding machine body.

FIG. 4 is a partially enlarged cutaway side view of the mold exchanging device.

FIG. 5 is a partially enlarged cutaway front view of the mold exchanging device.

FIG. 6 is a cutaway front view of a hoisting drive device in the mold exchanging device.

FIG. 7 is an enlarged side view of a mold connecting mechanism in the mold exchanging device.

FIG. 8 is an enlarged cutaway side view of the thin-walled split type elastic locking mechanism.

FIG. 9A is an enlarged side view of the thick wall split mold, and FIG. 9B is an enlarged cutaway front view of the thick wall split mold and the central mold.

FIG. 10 is an enlarged plan view of a split center type.

FIG. 11 is an explanatory view showing a die width changing operation of the central die in a broken plane.

FIG. 12 is an explanatory view showing a die width changing operation of the central die from the front.

FIG. 13 is an explanatory view showing the mold width changing operation of the central mold from the side surface.

FIG. 14 is a pattern diagram of various mold width adjustment examples of the mold exchanging device.

FIG. 15 is an explanatory diagram of an example of a mold narrowing operation of the mold exchanging device.

FIG. 16 is an explanatory diagram of an example of a mold widening operation of the mold exchanging device.

FIG. 17 is a flowchart of the overall mold width changing operation of the mold exchanging device.

FIG. 18 is a flowchart of a mold width changing operation of the central mold.

[Explanation of symbols]

1 ... Bending machine main body, 2 ... Upper mold, 3 ... Lower mold, 4 ... Bending mold, 6
... Mold changer (ATC) base, 7 ... Ram, 8 ... Lifting cylinder, 11 ... Mold changer, 12 ... Rotating clamp,
13 ... Plate material feeding device, 17 ... Central type, 17a, 17b ...
Divided central type, 17 ... Thin central type, 18 ... Thick divided type, 1
9 ... Thin wall split type, 20 ... Edge type, 21 ... Open type, 23 ...
Guide rollers, 24 ... Split type supporting rails, 25 ... Pin engaging holes, 26 ... Mold setting slide body, 27 ... Jumping mechanism, 2
8 ... Lower guide rail, 29 ... Split type guide mechanism, 30 ...
Mold coupling mechanism, 35 ... Advance / retreat moving member, 36 ... Pin joint, 37 ... U-axis servomotor, 38 ... Upper guide rail, 40 ... Unnecessary mold movement preventing device, 43 ... End mold moving mechanism, 45 ... Rotation for hoisting Shaft, 49 ... Drive device for jumping up,
51 ... Mold number selection key, 52 ... Feed screw, 55 ... Jumping motor, 63 ... Elastic locking mechanism, 74 ... Central mold opening / closing cylinder, 75 ... Thin center mold loading / unloading cylinder, L ... Mold width, P
... use position, Q ... jumping position, W ... plate material, W1 ... projection

Claims (2)

[Claims] 1. A part of the upper mold is composed of a plurality of thin-walled split molds arranged in the mold width direction, and these thin-walled split molds are rotatable about a hoisting rotary shaft between a use position and a hoisting position. And a thin-walled split mold that engages the hoisting rotary shaft with the thin-walled split mold in the rotational direction is provided movably in the axial direction. A die changing device for plate bending machines equipped with a feed screw that moves back and forth by the thickness of one sheet. 2. The mold replacement of a plate bending machine according to claim 1, further comprising an elastic locking mechanism that elastically engages with the thin-walled split mold at the flip-up position to prevent downward rotation of the thin-walled split mold. apparatus.