JP2740125B2 - Upper die holder device for press brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper die holder device for a press brake, and more particularly, to an upper die holder device for easily removing and replacing an upper die with respect to an upper table of a press brake.

[0002]

2. Description of the Related Art A press brake has a structure in which an upper table (sometimes called an upper apron) and a lower table (sometimes called a lower apron) are vertically opposed to each other. In this configuration, one of the tables is driven up and down as a ram.

In the press brake having the above structure, a lower die (die) is mounted on an upper portion of a lower table in order to bend a plate-shaped work, and an upper die (die) is mounted on a lower portion of the upper table. Punch).

[0004] In the above configuration, after the work is positioned on the lower die, the upper die and the lower die are engaged with each other so that the work can be bent.

In the press brake, a large number of upper die holder devices are mounted on the lower portion of the upper table in order to replace the upper die due to, for example, a difference in the bent shape of the work. The upper die is supported on the upper table so as to be detachable and replaceable.

In a conventional upper die holder device, an upper die clamp is swingably mounted on a holder main body mounted on a lower portion of an upper table via a tightening bolt, and inserted between the upper die clamp and the holder main body. The upper part of the upper die is strongly tightened and fixed by the upper die clamp by tightening the tightening bolt.

[0007]

Therefore, in the conventional configuration, in order to replace the upper die with the upper table, a large number of tightening bolts provided on the many upper die holder devices must be operated. However, there is a problem that this operation is extremely troublesome and troublesome.

Therefore, an upper die holder device has been developed in which an air cylinder is mounted on the upper die holder device and operations such as tightening and releasing of the upper die clamp are performed by the air cylinder.

In the above-described upper die holder device, a large number of upper die holder devices must be provided with air cylinders, respectively, and an air source is required. .

In the conventional upper holder device,
When the upper mold clamp is released from the upper mold clamp, the upper mold may fall.

Furthermore, in the conventional upper die holder device, when the upper die is mounted, the upper die clamp is lightly tightened so that the upper die does not drop, and then the upper die and the lower die are aligned to perform centering. In this state, the upper mold clamp must be strongly tightened, and there is a problem that the operation is troublesome.

As a prior example related to the present invention, for example, EP 087121 A1 (hereinafter referred to as “first example 1”)
And Japanese Patent Application Laid-Open No. Hei 6-23436 (hereinafter referred to as Prior Example 2).

In the above-mentioned prior art example 1, the upper die is clamped between the holder main body and the upper die by the upper die swingably pivotally attached to the upper table of the press brake. This is a configuration in which the upper die is rotated while avoiding the pivot on which the upper die clamp is pivotally mounted, and there is a problem that the shape of the upper die is specialized and the processing of the upper die is troublesome.

In the above-mentioned prior art example 2, the upper die can be easily attached to and detached from the upper die holder device by operating the operation lever provided on the upper die holder device to the clamp position and the unclamping position. However, in the prior example 2, since the upper die is mounted and removed by replacing the upper die in the longitudinal direction (left and right direction) with respect to the upper die holder device, a plurality of split dies having different lengths are used. This is a combined configuration, and there is a problem in that when the split mold near the center is to be detached and replaced, the detachable replacement is troublesome.

[0015]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an upper die holder device according to the present invention has an upper die attached to a lower part of a holder body detachably mounted on an upper table of a press brake. A pressing portion for pressing the upper die against the upper die supporting portion is provided below the upper die clamp, which is provided with an upper die supporting portion for supporting and supporting the holder main body so as to be pivotable around the center in the vertical direction. The upper die is provided with a locking projection that can be locked in the fall prevention groove provided on the upper die, and the upper side of the upper die clamp is pressed to apply a clamping force for clamping the upper die by the upper die clamp. Clamping force applying means is provided on the holder main body, and clamp operating means capable of transmitting and releasing the clamping force by the clamping force applying means to the upper mold clamp is provided, and clamping the upper mold. The pressing biasing means constantly pressed lightly urging the upper tool clamp to direction, those formed by providing between the upper tool clamp and the holder body.

Further, the upper die holder device according to the present invention is provided with an upper die supporting portion for supporting an upper die at a lower portion of a holder main body detachably mounted on an upper table in a press brake, A pressing portion for pressing the upper die against the upper die supporting portion is provided at a lower portion of the upper die clamp supported so as to be swingable around the center in the direction, and is engaged with a fall prevention groove provided on the upper die. The holder main body is provided with a free locking projection, and a clamp force applying unit that presses an upper side of the upper mold clamp to apply a clamp force for clamping the upper mold by the upper mold clamp. Providing a clamp operating means capable of transmitting and releasing the clamping force by the applying means to the upper mold clamp,
Pressing and urging means for constantly lightly urging the upper mold clamp in the direction in which the upper mold is clamped is provided between the holder main body and the upper mold clamp, and is opposed to this pressing and urging means. A release state holding means capable of holding the upper die clamp in a state where the upper die clamp is released is provided in a part of the holder main body or the upper die clamp.

Further, in the upper die holder device according to the present invention, an upper die supporting portion for supporting an upper die is provided at a lower portion of a holder main body detachably mounted on an upper table in a press brake, and the holder main body is provided with a vertical direction. A pressing portion for pressing the upper die against the upper die supporting portion is provided below the upper die clamp that is swingably supported around a central portion of the upper die, and can be latched to a fall prevention groove provided in the upper die. And a clamp force applying means for pressing the upper side of the upper mold clamp and applying a clamp force for clamping the upper mold by the upper mold clamp is provided on the holder main body. A clamp operating means capable of transmitting and releasing a clamping force by means to the upper mold clamp,
A wedge piece, which is engageable with a fall prevention groove provided on the upper mold, is provided on an upper portion of a locking projection provided on a lower portion of the upper mold clamp, and is biased in a direction in which the wedge piece is movable forward and backward and engages with the fall prevention groove. It is.

The clamp operating means includes a pressing control member rotatably provided above the upper clamp and capable of coming into contact with and separating from a pusher portion of the clamping force applying means. The pressing is performed to a clamp position for clamping the upper die, an unclamping position where the upper die clamp supports the upper die so as to be movable in the longitudinal direction, and an upper / lower attaching / detaching position where the upper die can be vertically attached / detached to / from the upper die clamp. An operation lever for freely rotating the control member is provided detachably with respect to the pressing control member.

Further, a stopper member capable of positioning the operation lever at the clamp position and the unclamping position is provided on a part of the holder body, and the stopper member is provided so as to be able to be immersed in the movement region of the operation lever.

Further, a wedge piece engageable with a fall prevention groove provided on the upper mold is biased above and below a locking projection provided on a lower part of the upper mold clamp in a direction in which the wedge piece can move forward and backward and engages with the fall prevention groove. It is provided.

Further, the release state holding means for holding the upper die clamp in a state where the upper die clamp is released is provided with a locking concave portion or a plunger on an upper part of the upper die clamp, and a holder body supporting the upper die clamp. A plunger or a locking recess that is detachable from the locking recess or the plunger is provided on the side.

[0022]

As is apparent from the above configuration, in the present invention, the upper body clamp is swingably supported on the holder main body mounted on the upper table of the press brake. A pressing portion for pressing the upper die is provided on an upper die supporting portion provided at a lower portion of the holder main body, and a locking projection is provided in a fall prevention groove provided on the upper die.

The holder main body is provided with a clamping force applying means for applying a clamping force to the upper mold clamp, and the upper mold clamp is capable of transmitting the clamping force by the clamping force applying means to the upper mold clamp. In addition, a releasable clamp operating means is provided. Further, there is provided pressing biasing means for constantly pressing the upper die clamp lightly in the direction in which the upper die is clamped.

Therefore, by holding the upper mold clamp in a lightly urged state by the pressing urging means and engaging the locking projection provided on the lower part of the upper mold clamp with the fall prevention groove provided on the upper mold. Further, it is possible to reliably prevent the upper mold from dropping from the upper mold holder device.

Further, when the clamping force by the clamping force applying means is transmitted to the upper mold clamp by operating the clamp operating means, the upper mold clamp firmly presses and fixes the upper mold to the upper mold supporting portion of the holder body. The mold can be securely fixed.

Further, since the released state holding means capable of holding the upper mold clamp in a state where the upper mold clamp is released against the pressing urging means is provided, the clamp applying means is operated by the operation of the clamp operating means. When the transmission of the clamping force to the upper mold clamp by the upper mold is released, the upper mold clamp can be held in a state where the upper mold clamp is released by the release state holding means against the pressing urging means.

In the state where the upper die clamp releases the upper die clamp, the upper die can be easily removed from the upper die holder device in the downward direction.

In the present invention, the clamp operating means includes a pressing control member rotatably provided on the upper mold clamp and capable of coming into contact with and separating from the pusher portion of the clamping force applying means. The control member is provided with an operation lever which is rotatable to three positions of a clamp position, an unclamping position and an up / down mounting position.

Accordingly, when the pressing control member is rotated to the clamp position by operating the operation lever and the pressing control member comes into contact with the pusher portion of the clamping force applying means, the clamping force of the clamping force applying means is applied to the upper die clamp. The upper mold can be clamped by the upper mold clamp.

When the pressing control member is rotated to the unclamping position by operating the operation lever, the pressing and fixing of the upper die clamp by the upper die clamp is released, and the upper die can be moved in the longitudinal direction by the upper die holder. Supported.

When the pressing control member is turned to the vertical mounting / detaching position by operating the operation lever, the transmission of the clamping force from the clamping force applying means to the upper mold clamp is released, and the lower force is applied to the upper mold holder device. The upper die is ready for detachable replacement from the direction.

Further, since the operation lever is detachable from the pressing control member, the operation lever can be removed so as not to be obstructed when the operation lever is obstructed depending on the bent shape of the work. Things.

In the present invention, since the stopper member for positioning the operation lever to the clamp position and the unclamping position is provided so as to be able to be immersed in the movement region of the operation lever, the operation lever can be easily positioned and the workpiece can be moved. Depending on the bent shape, it can be immersed in advance so as not to be in the way.

Further, in the present invention, a wedge piece engageable with the fall prevention groove provided on the upper die is provided on the upper part of the locking projection provided on the lower part of the upper die clamp so as to be able to advance and retreat. The play (clearance) between the provided drop prevention groove and the locking projection can be reduced, and the fall of the upper mold can be more reliably prevented.

The release state holding means has a configuration in which a locking recess is provided in the upper portion of the upper mold clamp, and a plunger which is detachably engaged with the locking recess is provided on the holder body side. When detaching the upper mold, the upper mold clamp can be securely held in the released state.

[0036]

Referring to FIGS. 1 and 2, an upper die holder device 1 according to the present embodiment is detachably mounted on a lower portion of an upper table 3 in a press brake (the overall configuration is not shown). . The upper die holder device 1 is used by being attached to a lower portion of the upper table 3 at appropriate intervals in the left-right direction.

That is, the upper die 5 in the press brake
Is the left-right direction (in FIG. 1, the direction perpendicular to the paper surface, FIG. 2).
(In the left-right direction), a plurality of split dies having different lengths may be used in an appropriate combination, and the upper die holder device may be easily used in either case. Reference numeral 1 denotes a large number mounted on the upper table 3 at appropriate intervals.

As is apparent from FIG. 1, the upper die holder device 1 includes a holder main body 7 detachably mounted on the upper table 3 and an upper die supporting portion integrally provided below the holder main body 7. 9, an upper mold clamp 11 capable of pressing and fixing the upper part 5U of the upper mold 5; a clamp force applying means 13 for applying a clamp force to the upper mold clamp 11; Clamp operating means 15 that can be transmitted to and released from mold clamp 11
And pressing urging means 17 (see FIG. 2) which constantly and lightly presses the upper mold clamp 11 in the direction in which the upper mold 5 is pressed and fixed.
And release state holding means 19 capable of holding the upper mold clamp 11 in a state where the clamp of the upper mold 5 is released against the pressing urging means 17.

More specifically, the holder main body 7 has a shape in which the thin upper mold supporting portion 9 is integrally provided below the thick block portion 7B in the front-rear direction. A mounting plate 25 protruding upward by a plurality of bolts 21 and pins 23 (see FIG. 2) is integrally mounted on the front surface (the left side surface in FIG. 1) of the block portion 7B of the holder body 7.

As shown in FIG. 2, the mounting plate 25 has a mode in which a divergent notch is provided at the lower center. As shown in FIG. 1, the upper protruding portion of the mounting plate 25 abuts on the lower part of the front surface of the upper table 3, and the clamping jaws 29 are screwed to the upper table 3 by tightening bolts 27.
And the upper projecting portion of the mounting plate 25 is
By pressing and fixing the holder body 7, the holder body 7 can be attached to the upper table 3.

In this embodiment, the holder body 7 and the mounting plate 25 are separately provided and integrally fixed. However, the holder body 7 and the mounting plate 25 may be provided integrally in advance. That is, the mounting plate 25 can be regarded as a part of the holder main body 7.

In order to adjust the vertical position of the holder main body 7, a wedge member 31 is interposed between the upper surface of the holder main body 7 and the lower surface of the upper table 3 so as to be adjustable in the left-right direction. The member 31 is screwed with a fixing bolt 35 that penetrates a long hole 33 provided in the mounting plate 25 in the left-right direction.

In the above configuration, the wedge member 31 is adjusted in the left-right direction in FIG. 2 while the clamp jaw 29 is held in a weakly tightened state so that the holder body 7 does not drop and the fixing bolt 35 is loosened. By doing so, the holder main body 7 can be finely adjusted vertically with respect to the upper table 3.

The upper die clamp 11 is made of a plate-like member having substantially the same width as the width of the holder body 7 in the left-right direction, and is provided at a portion corresponding to the divergent notch of the mounting plate 25. Is formed with a correspondingly shaped upper protruding portion, and is swingably supported by the holder main body 7 so as to press and fix the upper portion 5U of the upper die 5 between the upper die supporting portion 9 and the upper die supporting portion 9.

More specifically, a plurality of through holes 11H are provided near the center of the upper mold clamp 11 in the vertical direction.
A mounting bolt 39 which is horizontally screwed and fixed to the upper die supporting portion 9 via a nut 37 through the through hole 11H is swingably supported by a head. A coil spring 41 acting between the upper die supporting portion 9 and the upper die clamp 11 to separate the upper die support portion 9 and the upper die clamp 11 is elastically mounted.

The contact portion between the head of the mounting bolt 39 and the through hole 11H is formed on a spherical contact surface so that the upper mold clamp 11 can be smoothly swung.

At the lower end of the upper mold clamp 11, a locking projection 11P, which is capable of engaging a horizontal drop prevention groove 5G formed on the upper mold 5, is projected toward the upper mold support 9. It is formed. Slightly above the locking projection 11P, a pressing member 43 is provided, which comes into contact with the inclined surface 5S of the upper portion 5U of the upper die 5 and presses the upper die 5 against the upper die supporting portion 9.

The pressing member 43 has a shape obtained by processing a part of the peripheral surface of a cylinder into a flat surface, and is attached to the lower part of the upper mold clamp 11 via a plurality of screws 45 so as to be slightly rotatable.

A wedge piece 47 is provided between the locking projection 11P and the pressing member 43 so as to be freely engageable with the fall prevention groove 5G of the upper die 5 so as to be able to move forward and backward.
The wedge piece 47 is constantly urged in a direction in which the wedge piece 47 engages with the drop prevention groove 5G by the action of an elastic member 49 such as a coil spring elastically mounted between the upper die clamp 11 and the wedge piece 47.

The movement of the wedge piece 47 due to the urging force is restricted by a part of the wedge piece 47 abutting on a part of the pressing member 43. An inclined surface 47S is formed so that engagement and disengagement with 5G can be easily performed.

The clamping force applying means 13 for applying a clamping force to the upper die clamp 11 for pressing and fixing the upper die 5 to the upper die support portion 9 by the pressing member 43 provided below the upper die clamp 11. Are housed in holes 7H in the front-rear direction provided in the block portion 7B of the holder body 7.

More specifically, as shown in FIG. 1, the clamping force applying means 13 includes a nut member screwed to the adjusting screw 51 to adjust the position of the ring member 53 movably fitted to the adjusting screw 51. 55 and the head 51 of the adjusting screw 51
A strong elastic member 57 such as a disc spring mounted elastically is provided between H and the ring member 53.

The head 51H of the adjusting screw 51 is connected to the hole 7
One end side of a cylindrical pressing member 59, which includes a nut member 55 and is movably provided in the hole 7 </ b> H, is in contact with the ring member 53. The other end of the pressing member 59 is in contact with a ring nut 61 screwed into the entrance of the hole 7H so as to be adjustable in position, and a pin-shaped pusher provided on the other end of the pressing member 59. The portion 59P projects outward from the ring nut 61.

The clamp operating means 15 capable of transmitting and releasing the clamp force by the clamp force applying means 13 to the upper mold clamp 11 is provided on the upper side of the upper mold clamp 11.

More specifically, the clamp operating means 15
Is provided at the upper part of the upper mold clamp 11 so as to be freely rotatable, and has a pressing control member 63 which can come into contact with and separate from the pusher portion 59P.

In this embodiment, the pressing control member 6
As No. 3, a pressing screw 63 is screwed on the upper part of the upper mold clamp 11 so as to be able to advance and retreat, and the tip of the pressing screw 63 is in contact with the pusher portion 59P.

Therefore, when the pressing screw 63 is rotated in a direction to loosen the pressing screw 63 with respect to the upper die clamp 11, the pressing screw 63 is separated from the pusher portion 59P. Conversely, when the pressing screw 63 is tightened, the pressing screw 63 is in a state of lightly contacting the pusher portion 59P. When the pressing screw 63 is further tightened, the pusher portion 59P
Is strongly pressed to compress the elastic member 57. Therefore, the accumulating force of the elastic member 57 is applied as a reaction force.

In order to rotate the pressing screw 63,
An operation lever 65 is detachably attached to the pressing screw 63. That is, the pressing screw 63 is provided with an engaging hole 63H, and the operating lever 65 is integrally provided with an engaging block 67 capable of engaging and disengaging from the engaging hole 63H. The engagement block 67 is provided with a ball plunger 6 which is detachable from a groove (not shown) provided in the engagement hole 63H.
9 are provided. This ball plunger 69 regulates the relative rotation of the engagement block 67 with respect to the pressing screw 63.

When the engaging hole 63H is non-circular such as an oval or a gear, the engaging block 67 does not rotate relative to the pressing screw 63. The ball plunger 69 can be omitted.

According to the above configuration, the pressing screw 63 can be rotated by rotating the operation lever 65.

That is, the operation lever 65 is moved to the clamping position A (FIG. 2) where the upper die clamp 11 clamps the upper die 5.
Unclamping position B in which the upper die clamp 11 supports the upper die 5 so as to be movable in the longitudinal direction, and the upper die clamp 1
The upper die 5 can be freely turned to an upper / lower attachment / detachment position C where the upper die 5 can be attached / detached in the up / down direction.

A stopper member 71 capable of positioning the operation lever 65 at a clamp position A and an unclamping position B
(See FIG. 2) is attached to the attachment plate 25.

More specifically, a slit 73 is formed in the mounting plate 25 corresponding to the clamping position A and the unclamping position B, and the stopper member 71 is provided with a pin 75 (FIG. 3) in the slit 73. (See ref.).

Therefore, the stopper member 71 can freely move in and out of the moving surface of the operation lever 65, in other words, the front surface of the mounting plate 25. A hole 25H is formed in the mounting plate 25 so as to communicate with the tip of the slit 73 so that the stopper member 71 immersed in the slit 73 can be easily raised. Also, the stopper member 71
The ball plunger 77 is detachable from a concave portion provided in an arc-shaped portion of the stopper member 71 in order to keep
Are provided on the mounting plate 25.

The urging means 17 for constantly urging the upper mold clamp 11 lightly in the direction in which the upper mold 5 is clamped is provided between the upper part of the upper mold clamp 11 and the block 7B of the holder body 7. And an elastic member 17S (see FIG. 2), such as a coil spring, which is mounted on the elastic member.

The released state holding means 19, which is capable of holding the upper mold clamp 11 in a state where the clamp of the upper mold 5 is released against the urging force of the urging means 17 as shown in FIG. A ball plunger 81 is attached to the mounting plate 25 so as to be detachable from a locking recess 79 such as a groove or a hole formed in an upper portion of the upper die clamp 11.

Incidentally, the locking recess 79 may be provided on the mounting plate 25 and the ball plunger 81 may be provided on the upper mold clamp 11.

In the above configuration, FIG.
As shown by the imaginary line, the upper die supporting portion 9 of the holder body 7
When the upper lever 5 is clamped between the upper die clamp 11 and the upper lever 5, the operation lever 65 is rotated to the clamp position A and the pressing screw 63 serving as a pressing control member is tightened to apply a clamping force. The elastic member 57 in the means 13 is further compressed.

Therefore, the accumulating force of the elastic member 57 increases, and the upper mold clamp 11 is rotated counterclockwise in FIG. 1 by the reaction force of the accumulating force. The mold 5 is pressed and fixed more strongly.

Conversely, when the operating lever 65 is turned to the unclamping position B and the pressing screw 63 is slightly loosened, the pressing screw 63 and the pusher 59 of the clamping force applying means 13 are released.
P is lightly abutted, and the upper die 5 is released from being pressed and fixed by the upper die clamp 11, and the upper die 5 is brought into a state in which the locking protrusion 11P of the upper die clamp 11 is engaged with the fall prevention groove 5G. As a result, it is supported movably in the longitudinal direction (left-right direction).

Stopper member 7 at unclamping position B
1 is immersed in the slit 73 and the operation lever 65
When the is rotated to the vertical mounting / removing position C, the pressing screw 63 is largely moved leftward in FIG. 1, and the pressing screw 63 is separated from the pusher portion 53 </ b> P of the clamp applying means 13.

That is, the upper mold clamp 11 is released from the clamp applying means 13 and the upper mold clamp 1
1 rotates against the elastic member 17 </ b> S of the pressing and urging means 17, so that the locking recess 79 provided at the upper part of the upper die clamp 11 and the ball plunger 81 can be engaged.

The locking recess 79 and the ball plunger 81
When the upper mold clamp 11 is engaged with the upper mold clamp 11, the lower portion of the upper mold clamp 11 is opened in a direction away from the upper mold support portion 9. Become.

When the locking recess 79 of the upper clamp 11 is engaged with the ball plunger 81 as described above, the operation lever 65 is moved to the unclamping position B.
The pressing screw 63 and the clamping force applying means 13
The pusher portion 59P of the upper mold clamp 1 again.
1 is rotated counterclockwise in FIG. 1, and the engagement between the locking recess 79 and the ball plunger 81 is released.

Now, in order to mount the upper die 5 on the upper die holder device 1 from the lower side in the above configuration, the operation lever 65 is positioned at the vertical mounting / detaching position C as shown in FIG. When the operation lever 65 is located at the upper / lower attachment / detachment position C, the upper mold clamp 11 is
7, the lower side of the upper die clamp 11 can be opened, and the upper 5U of the upper die 5 is inserted from below into the space between the upper die support portion 9 and the upper die clamp 11 of the holder body 7. Can be inserted.

When the upper part 5U of the upper die 5 is inserted between the upper die supporting part 9 and the upper die clamp 11, the upper die clamp 11 is always lightly moved in the direction of clamping the upper die 5 by the action of the pressing urging means 17. The upper clamp 1
The locking projection 11P provided on the lower part of the first die 5 engages with the fall prevention groove 5G provided on the upper die 5.

As described above, when the locking projection 11P of the upper die clamp 11 is engaged with the fall prevention groove 5G of the upper die 5, the operation lever 65 is moved to the unclamping position B as shown in FIG. To rotate.

When the operating lever 65 is rotated to the unclamping position B, the pressing screw 63 comes into contact with the pusher portion 59P of the pressing force applying means 13, and a clamping force is applied to prevent the upper die 5 from dropping, thereby preventing the upper die 5 from falling. 5 in the longitudinal direction (left-right direction)
It is in a state where it is movably supported.

Therefore, when the operation lever 65 is located at the unclamping position B, the upper die 5 is moved in the left-right direction, and the upper die 5 is positioned relative to the upper die holder device 1 in the left-right direction. In this case, when the upper die 5 is composed of a plurality of split dies, the split dies are brought into contact with each other to perform positioning.

Next, in order to strongly press and fix the upper die 5 to the upper die supporting portion 9 of the holder main body 7 in the upper die holder device 1, the operation lever 65 is turned to the clamp position A as shown in FIG. Dynamic positioning. When the operating lever 65 is positioned at the clamping position A, the pressing screw 63 strongly presses the pusher portion 59P of the clamping force applying means 13, and the upper die clamp 11 moves the upper die 5 to the upper die supporting portion 9 by the reaction force. Press and fix.

Thereafter, when the movable table in the press brake is moved up and down to engage the upper die 5 with the lower die (not shown), the upper die 5 is moved between the upper die support 9 and the upper die clamp 11. Is relatively raised and inserted.

At this time, the inclined surface 5S of the upper die 5 is
3, the upper die clamp 11 is rotated clockwise in FIG. 1 by the relative rise of the upper die 5, and the pressing screw 63 gradually presses the pusher portion 59P of the clamping force applying means 13. , The accumulating force of the elastic member 57 is gradually increased. Therefore, the upper mold clamp 11 is
Is gradually and strongly pressed and fixed.

When the shoulder of the upper die 5 comes into contact with the lower end surface of the upper die support portion 9, the upper die 5 is strongly pressed and fixed to the upper die support portion 9 by the upper die clamp 11. 1,
As shown in FIG. 7, the wedge piece 47 is engaged with the fall prevention groove 5G of the upper die 5, and the play (gap) between the engagement protrusion 11P and the fall prevention groove 5G is reduced.

As described above, the wedge piece 47 is
When the play between the engagement protrusion 11P and the fall prevention groove 5G is reduced by engaging with the fall prevention groove 5G, even if the pressing and fixing by the upper mold clamp 11 is released, the upper mold 5
Does not fall under its own weight.

As described above, the upper die 5 is firmly pressed and fixed to the upper die supporting portion 9 by the upper die clamp 11, and the work is bent in cooperation with the lower die. To remove, as shown in FIG. 8, the operation lever 65 is pivotally positioned at the vertical mounting / detaching position C.

Thereafter, the lower side of the upper die 5 is rotated in the direction of arrow R to engage the locking recess 79 provided on the upper clamp 11 with the ball plunger 81, and the lower side of the upper clamp 11 is rotated. Is opened so as to separate from the upper mold supporting portion 9. Then, by pulling down the upper die 5, the upper die 5 can be removed below the upper die clamp 11 and the like.

After the upper die 5 has been removed in the downward direction, the operating lever 65 is once rotated to the unclamping position B to release the engagement between the locking recess 79 and the ball plunger 81. As shown in FIG. 4, the upper die 5 can be attached to the upper die holder device from below by positioning the lever 65 again at the vertical mounting / detaching position C as described above.

Referring again to FIG. 1, the holder body 7
A rear upper clamp 83 is swingably provided on the rear surface (the right side surface in FIG. 1) so that the upper die 5 can be mounted upside down.

More specifically, a support pin 85 corresponding to the mounting bolt 39 is horizontally mounted on a rear surface of the upper die supporting portion 7 by a fixing bolt 89 penetrating a pipe-like spacer 87. The rear upper clamp 83 is swingably supported by a pin 85.

The head of the bolt 91 mounted on the upper part of the rear upper clamp 83 is connected to the clamping force applying means 13.
Is in contact with the head 51H of the adjusting screw 51 in FIG.

In order to prevent the support pin 85 from rotating relative to the rear upper die clamp 83, the locking pin 93 provided on the support pin 85 engages with the groove 83G provided on the rear upper die clamp 83. Have been combined.

Since the other structure is the same as the structure of the upper mold clamp 11 described above, the same reference numerals are given to the components having the same functions, and the detailed description will be omitted.

The release of the upper die 5 by the rear upper die clamp 83 is performed by rotating the fixing bolt 89.

The upper die 5 by the rear upper clamp 83 is used.
Is almost the same as that of the above-mentioned prior example 2, and therefore, a more detailed description is omitted.

This embodiment is not limited to the embodiment described above, but can be implemented in other modes by making appropriate changes.

For example, a gas spring can be used as the clamping force applying means 13. Further, instead of the pressing screw 63, a cylindrical cam having a three-stage cam contact portion with the pusher portion 59P can be used as the pressing control member.

[0097]

As will be understood from the above description of the embodiment, in the present invention, the upper die clamp is swingably supported on the holder main body mounted on the upper table of the press brake. At the lower part of the upper die clamp, a pressing part for pressing the upper die against the upper die supporting part provided at the lower part of the holder main body is provided, and a locking projection is provided in the fall prevention groove provided on the upper die. It is.

The holder main body is provided with a clamping force applying means for applying a clamping force to the upper mold clamp, and the upper mold clamp is capable of transmitting the clamping force by the clamping force applying means to the upper mold clamp. In addition, a releasable clamp operating means is provided. Further, there is provided pressing biasing means for constantly pressing the upper die clamp lightly in the direction in which the upper die is clamped.

Therefore, according to the present invention, the upper die clamp is held in a lightly urged state by the pressing urging means,
In addition, by engaging the locking projection provided on the lower part of the upper mold clamp with the fall prevention groove provided on the upper mold, the fall of the upper mold from the upper mold holder device can be reliably prevented.

Further, according to the present invention, when the clamping force by the clamping force applying means is transmitted to the upper mold clamp by operating the clamp operating means, the upper mold clamp strongly presses the upper mold against the upper mold supporting portion of the holder body. The upper mold can be securely fixed.

Further, according to the present invention, there is provided a release state holding means capable of holding the upper mold clamp in a state where the upper mold clamp is released against the pressing urging means. When the transmission of the clamping force to the upper mold clamp by the clamp applying means is released by the operation of, the released state holding means holds the upper mold clamp in a state where the upper mold clamp is released against the pressing urging means. Can be.

In the state where the upper die clamp releases the upper die clamp, it is easy to remove the upper die downward with respect to the upper die holder device.

In the present invention, the clamp operating means includes a pressing control member rotatably provided on the upper mold clamp and capable of coming into contact with and separating from the pusher portion of the clamping force applying means. The control member is provided with an operation lever which is rotatable to three positions of a clamp position, an unclamping position, and a vertical mounting / dismounting position, and the operation lever is provided detachably with respect to the pressing control member.

Therefore, according to the present invention, when the pressing control member is rotated to the clamping position by operating the operating lever and the pressing control member comes into contact with the pusher portion of the clamping force applying means, the clamping force of the clamping force applying means is reduced. The force can be transmitted to the upper mold clamp, and the upper mold can be clamped by the upper mold clamp.

Further, according to the present invention, when the pressing control member is turned to the unclamping position by operating the operation lever, the pressing and fixing of the upper mold clamp by the upper mold clamp is released, and the upper mold is moved to the upper mold. The holder is movably supported in the longitudinal direction.

In the present invention, when the pressing control member is turned to the vertical mounting / detaching position by operating the operation lever, the transmission of the clamping force from the clamping force applying means to the upper mold clamp is released, and the upper mold holder is released. The upper die can be attached to and detached from the device from below.

Further, according to the present invention, the operating lever is detachable from the pressing control member, so that when the operating lever is in the way depending on the bent shape of the work, the operating lever is operated so as not to be in the way. The lever can be removed.

Further, in the present invention, since the stopper member which can position the operation lever to the clamp position and the unclamping position is provided so as to be able to be immersed in the movement region of the operation lever, the operation lever can be easily positioned and the workpiece can be moved. Depending on the bent shape, it can be immersed in advance so as not to be in the way.

Further, according to the present invention, a wedge piece engageable with the fall prevention groove provided on the upper die is provided on the upper part of the locking projection provided on the lower part of the upper die clamp so as to be able to advance and retreat. The play (clearance) between the provided drop prevention groove and the locking projection can be reduced, and the fall of the upper mold can be more reliably prevented.

In the present invention, the release state holding means has a configuration in which a locking concave portion is provided on the upper portion of the upper die clamp, and a detachable plunger is provided on the holder main body side in the locking concave portion. When the is removed downward, the upper mold clamp can be reliably held in the released state.

[Brief description of the drawings]

1 is a sectional view of an upper die holder device according to the present invention, and FIG.
FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 2 is a front view of the upper die holder device according to the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is an operation explanatory view when the upper die is mounted on the upper die holder device.

FIG. 5 is an operation explanatory view when the upper die is mounted on the upper die holder device.

FIG. 6 is an operation explanatory view when the upper die is mounted on the upper die holder device.

FIG. 7 is an operation explanatory view when the upper die is mounted on the upper die holder device.

FIG. 8 is an operation explanatory view when the upper mold is removed from the upper mold holder device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper die holder device 3 Upper table 5 Upper die 7 Holder main body 9 Upper die support part 11 Upper die clamp 11P Locking projection 13 Clamping force applying means 15 Clamp operation means 17 Press urging means 19 Release state holding means 47 Wedge piece 63 Press Control member (pressing screw) 65 Operation lever 71 Stopper member 79 Locking recess 81 Ball plunger

Claims (7)

(57) [Claims] An upper die supporting portion for supporting an upper die is provided at a lower portion of a holder main body detachably mounted on an upper table of a press brake, and the holder main body swings around a central portion in a vertical direction as a fulcrum. A pressing portion for pressing the upper die against the upper die supporting portion is provided at a lower portion of the upper die clamp supported so as to be capable of being provided, and a locking projection is provided on the fall prevention groove provided on the upper die so as to be lockable. Clamping force applying means for pressing the upper side of the mold clamp to apply a clamping force for clamping the upper mold by the upper mold clamp is provided on the holder body, and the clamping force by the clamping force applying means is applied to the upper mold clamp. A pressure urging means that is provided with a clamp operating means that can be freely transmitted and released, and that constantly presses and urges the upper mold clamp in a direction in which the upper mold is clamped,
An upper holder device for a press brake, which is provided between the holder main body and the upper die clamp. 2. An upper die supporting portion for supporting an upper die is provided at a lower portion of a holder main body detachably mounted on an upper table in a press brake, and the holder main body swings around a central portion in a vertical direction as a fulcrum. A pressing portion for pressing the upper die against the upper die supporting portion is provided at a lower portion of the upper die clamp supported so as to be capable of being provided, and a locking projection is provided on the fall prevention groove provided on the upper die so as to be lockable. Clamping force applying means for pressing the upper side of the mold clamp and applying a clamping force for clamping the upper mold by the upper mold clamp is provided on the holder body, and the clamping force by the clamping force applying means is applied to the upper mold clamp. A pressure urging means that is provided with a clamp operating means that can be freely transmitted and released, and that constantly presses and urges the upper mold clamp in a direction in which the upper mold is clamped,
A release state holding unit that is provided between the holder main body and the upper die clamp and is capable of holding the upper die clamp in a state where the upper die clamp is released against the pressing urging means, An upper die holder device for a press brake, wherein the upper die holder device is provided on one part or the upper die clamp. 3. An upper die supporting portion for supporting an upper die is provided at a lower portion of a holder main body detachably mounted on an upper table in a press brake, and the holder main body swings around a central portion in a vertical direction as a fulcrum. A pressing portion for pressing the upper die against the upper die supporting portion is provided at a lower portion of the upper die clamp supported so as to be capable of being provided, and a locking projection is provided on the fall prevention groove provided on the upper die so as to be lockable. Clamping force applying means for pressing the upper side of the mold clamp to apply a clamping force for clamping the upper mold by the upper mold clamp is provided on the holder body, and the clamping force by the clamping force applying means is applied to the upper mold clamp. The wedge piece is provided with a clamp operating means capable of transmitting and releasing the wedge piece, which can be engaged with a fall prevention groove provided on the upper mold on an upper part of a locking projection provided on a lower part of the upper mold clamp. An upper die holder device for a press brake, wherein the upper die holder device is freely and urged in a direction engaging with the drop prevention groove. 4. The clamp operating means includes a pressing control member rotatably provided on an upper portion of the upper mold clamp and capable of coming into contact with and separating from a pusher portion of the clamping force applying means. The pressing is performed to a clamp position for clamping the upper die, an unclamping position where the upper die clamp supports the upper die so as to be movable in the longitudinal direction, and an upper / lower attaching / detaching position where the upper die can be vertically attached / detached to / from the upper die clamp. The upper die holder device for a press brake according to claim 1, 2, or 3, wherein an operation lever capable of rotating a control member is provided detachably with respect to the pressing control member. 5. A stopper member for positioning the operation lever at a clamp position and an unclamping position is provided at a part of the holder body, and the stopper member is provided so as to be able to be immersed in a movement area of the operation lever. Claim 4
4. An upper die holder device for a press brake according to claim 1. 6. A wedge piece, which is engageable with a fall prevention groove provided on an upper mold, is urged in a direction in which the wedge piece can freely advance and retreat and engage with the fall prevention groove on an upper part of a locking projection provided on a lower part of an upper mold clamp. The upper die holder device in the press brake according to claim 1, wherein the upper die holder device is provided. 7. A released state holding means for holding the upper die clamp in a state where the upper die clamp is released, wherein a locking concave portion or a plunger is provided on an upper portion of the upper die clamp, and the holder body side supporting the upper die clamp is provided. 3. The upper die holder device for a press brake according to claim 2, wherein a plunger or a locking concave portion that is detachable from the locking concave portion or the plunger is provided.