JPH0757376B2 - Sheet metal processing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal working machine for bending a sheet metal.

[0002]

2. Description of the Related Art As a sheet metal processing machine (sheet metal bending machine) for bending a sheet metal, there have been conventionally used FIGS. 8 and 9 (Japanese Patent Publication No. 2-4).
(Japanese Patent No. 9803) is known. This known sheet metal working machine has a pair of upper and lower clamping rolls 111,
Movable unit 102 having 112 and both nipping rolls 1
A rotary drive device 104 for rotating the motors 11 and 112 in opposite directions and an arc rotation operation mechanism 105 for vertically rotating the movable unit 102 are provided. The rotation driving device 104 operates the handle 141 to rotate both the nipping rolls 111 and 112 in mutually opposite directions,
The sheet metal Z to be clamped between the two clamping rolls can be moved in the lengthwise direction (horizontal direction orthogonal to the left-right direction in FIG. 8). The arc rotation operation mechanism 105
By operating the handle 151, the upper holding roll 1
The movable unit 102 as a whole can be vertically pivoted about the tip portion of the sheet metal holding portion 11 as a center P. Further, the upper holding roll 111 and the lower holding roll 11
2 has an appropriate length, and both nipping rolls 111 and 112 are installed in parallel with each other. Therefore, the distance W between both nipping rolls 111 and 112 is a flat surface. It is a very small amount (for example, about 10 to 30 mm) necessary for the processed sheet metal Z to be inserted in the lateral direction.

In this known sheet metal working machine (sheet metal bending machine), the intermediate portion in the width direction (horizontal direction) of the flat sheet metal sheet Z to be processed is sandwiched between the sandwiching rolls 111 and 112 (to be processed). The non-clamping side Zb of the processed sheet metal Z is supported on the support base 106), and the handle 15 of the arc rotation operation mechanism 105.
1 is operated to incline the movable unit 102 by a predetermined angle (for example, an angle of about 20 ° as shown in FIG. 9), and the sandwiching portion Zc between the sandwiching rolls 111 and 112 in the sheet metal to be processed.
Bend one side Za of the length direction within a predetermined angle range,
Subsequently, the handle 141 of the rotation driving device 104 is operated to rotate the both sandwiching rolls 111 and 112 in opposite directions while inclining the sandwiching rolls 111 and 112, thereby sequentially processing the sheet metal Z sandwiched between the sandwiching rolls. The work sheet metal Z is bent in a predetermined angle range and moved in the front-rear direction, whereby the work sheet metal Z can be bent at a predetermined angle (for example, 20 °) over the entire length. By repeating the bending operation as described above several times, the sheet metal Z to be processed can be bent up to an angle of 90 ° as shown by a chain line in FIG. 9, for example.

By the way, in this type of sheet metal bending, not only a flat sheet metal is bent, but also a single sheet metal is bent a plurality of times like a gutter having a U-shaped cross section. is there.

[0005]

However, in the known sheet metal working machine shown in FIGS. 8 and 9, the flat sheet metal can be simply bent without any problem. In the case where there is a bent portion which is bent upward or downward in advance in the portion Za sandwiched by the sandwiching rolls 111 and 112 from the sandwiching portion Zc, the folded portion is the upper and lower sandwiching rolls 111. , 112 cannot be accommodated in the gap W between them, and thus this known sheet metal working machine has a problem in that it cannot perform sheet metal working in a complicated shape.

In view of the problems of the conventional sheet metal working machine as described above, the present invention is capable of performing sheet metal working of a complicated shape, such as a case where a single sheet metal is bent at a plurality of points such as a gutter shape. It is an object of the present invention to provide a sheet metal processing machine that can be used.

[0007]

According to the present invention, a sheet metal to be bent can be sandwiched from both front and back sides by a front end portion of a mounting base mounted on a base so as to be vertically rotatable. Further, a clamping unit having a pair of upper and lower clamping members each having a circular outer peripheral surface is attached, and a rotary drive device for rotating the pair of upper and lower clamping members in mutually opposite directions is provided. A sheet metal feeding mechanism configured to sequentially move laterally the sheet metal to be clamped and held between the both clamping members by rotating the sheet metal clamping mechanism between the both clamping members, and the sheet metal clamping section by the pair of upper and lower clamping members. An arc rotating operation mechanism for rotating the sandwiching unit in an arc direction in the circumferential direction with respect to the sheet metal feeding direction, and the sandwiching unit in the sheet metal when the sheet metal is bent. In the sheet metal processing machine and the clamping portion provided with a support base for supporting the widthwise outer portion by the mounting block, the upper horizontal frame fitted with a clamping member on the clamping unit,
A lower lateral frame to which a lower clamping member of the clamping unit is attached, and a vertical frame connecting the upper lateral frame and the lower lateral frame at their rear side are formed in a U-shape in side view, and the upper lateral side of the mounting base is formed. It is characterized in that the portion surrounded by the frame, the lower horizontal frame and the vertical frame is a space portion having a large volume in the front and rear and in the top and bottom for accommodating the one end side of the sheet metal to be clamped by the clamping unit. .

[0008]

According to the sheet metal working machine of the present invention, in a state where the sheet metal to be processed is sandwiched between both clamping members, the clamping unit is tilted by the arc rotation operation mechanism and the sheet metal is horizontally moved by the sheet metal feeding mechanism. By doing so, sheet metal bending can be performed. Further, at the time of bending the sheet metal, the inner portion of the sheet metal holding portion of the sheet metal to be processed is accommodated in the U-shaped space portion of the mounting base to which both holding members are attached,
Since the space in the mount has a large volume in the front and rear and in the top and bottom, for example, a bent part that is bent in the vertical direction in advance to an inner part (mounter side part) of the sheet metal clamping part of the sheet metal to be processed. Even if there is a portion, since the bent portion is accommodated in the space portion, the bending process can be performed without any trouble.

[0009]

According to the sheet metal working machine of the present invention, the portion surrounded by the upper horizontal frame, the lower horizontal frame, and the vertical frame in the mounting base to which the pair of upper and lower clamping members are mounted is clamped by the clamping unit. Since it is a space portion having a large volume in the front and rear and up and down for accommodating one end side of the, even if there is a bending portion in advance in the portion accommodated on the mounting base side of the sheet metal to be processed, There is an effect that the bent portion can be accommodated in a large-volume space portion, and bending processing can be performed at a plurality of positions of one sheet metal to be processed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 7. The sheet metal working machine of this embodiment is configured so that the sheet metal Z to be processed can be selectively processed into sheet metal and cutting. Has been done.

This sheet metal working machine includes a holding unit 10 having a pair of upper and lower holding members 11 and 12 on a base 1 for holding a sheet metal Z to be bent or cut from both sides thereof. A rotary drive device 4 for rotating the pair of upper and lower clamping members 11 and 12 in opposite directions to each other is provided, and both clamping members 11 and 12 are rotated in opposite directions to each other by the rotation drive device 4. , 1
A sheet metal feeding mechanism 3 configured to sequentially move a sheet metal sheet Z, which is sandwiched and held between two, in a lateral direction, and a sheet metal sandwiching section Zc formed by a pair of upper and lower sandwiching members 11 and 12 as a center P as a sandwiching unit. 10 is the circumferential direction (up and down direction) with respect to the sheet metal feeding direction (arrow C-D direction in FIG. 2).
An arc rotation operation mechanism 5 for rotating the sheet metal Z in an arc and a holding unit 10 on the sheet metal Z to be processed during bending operation of the sheet metal Z to be processed.
The sandwiching part Zc is constituted by a support base 6 for supporting the width direction outer portion Zb and a cutting device 8 for cutting the sheet metal Z to be processed.

This sheet metal working machine has a width direction (arrow C-D).
Direction) total length 400-500mm, front-back direction (arrow A-
B-direction) total length is 800-1000mm, height is 700-
It has a relatively small size of about 900 mm and can be loaded on a truck or the like and brought to a construction site.

The base 1 is constructed by assembling in a rectangular box shape with a flat plate or a frame material. By attaching casters to the four corners of the lower surface of the base 1, the sheet metal working machine can be manually pushed and moved.

The holding unit 10 and the sheet metal feed mechanism 3 are mounted on a mounting base 21, and the mounting base 21 is supported above the base 1 via an arc rotation operation mechanism 5 so as to be capable of arc rotation. . The sandwiching unit 10, the sheet metal feed mechanism 3 and the mounting base 21 constitute a movable unit 2 which is rotatable in an arc with respect to the base 1.

The mounting bases 21 are hollow upper horizontal frames 2 respectively.
2, the lower horizontal frame 23, and the vertical frame 24 are formed in a U shape in a side view. Also, the upper horizontal frame 22, the lower horizontal frame 23, and the vertical frame 24
A space 25 having a relatively large volume is formed in front, rear, and top and bottom of the interior surrounded by and.

An upper base plate 31 for mounting the upper holding members 11, 11 is provided at the tip of the upper horizontal frame 22 of the mounting base 21. On the other hand, a lower base plate 32 for mounting the lower holding members 12, 12 is provided at the tip of the lower horizontal frame 23 of the mounting base 21. Upper base plate 31
As shown in FIG. 4, the lower base plate 32 and the lower base plate 32 have a substantially rectangular shape and are vertically symmetrical to each other. Further, the lower surface of the upper base plate 31 and the upper surface of the lower base plate 32 are linear, and the lower surface of the upper base plate 31 and the upper surface of the lower base plate 32 are slightly smaller than the thickness of the sheet metal Z to be processed. It has a large small interval. The upper and lower base plates 31 and 32 used in this embodiment have a height of 210 mm and a lateral width of 37 mm.
The thickness is 0 mm and the thickness is about 40 mm.

The upper base plate 31 is attached to the upper horizontal frame 22 so as to be slidable up and down, and the upper base plate 31 is adjusted to an appropriate height position by the vertical movement adjusting device 7 (that is, the lower surface of the upper base plate 31). And a lower base plate upper surface, a sheet metal to be processed can be fixed at a position where a space can be inserted. The vertical movement adjusting device 7 has an adjusting screw 71 as shown in FIGS. 3 and 4, and the adjusting screw 71 can adjust the height of the upper base plate 31. 31 can be fixed to the upper horizontal frame 22 at a predetermined height.

As shown in FIG. 4, the holding unit 10 has two right and left (arrow C-D direction) upper holding members 11, 11 and two left and right lower holding members 12, 12. In this embodiment, the upper and lower sandwiching members 11 and 12 have the same shape, and are circular disks each having a diameter of 125 mm and a thickness of about 9 mm. Further, the edge portion on the front surface side (arrow A side) of the upper holding members 11, 11 is sharply angled to form a cutting edge 11a for shearing. The cutting edge 11a constitutes a part of the cutting device 8 as described later.

The upper holding members 11 and 11 and the lower holding members 12 and 12 are axially attached to the upper base plate 31 and the lower base plate 32, respectively, in a state where they are vertically aligned. The lower surface of each upper holding member 11, 11 is the upper base plate 3
It is attached so that it slightly protrudes from the lower surface of 1 (about 1 mm). Further, each of the lower holding members 12 and 12 is also attached with its upper surface slightly protruding (about 1 mm) from the upper surface of the lower base plate 32. The sheet metal Z to be processed is sandwiched between the lower surfaces of the upper sandwiching members 11 and 11 and the upper surfaces of the lower sandwiching members 12 and 12, and the lower surface of the upper sandwiching members 11 and 11 and the upper surfaces of the lower sandwiching members 12 and 12, respectively. The interval of is adjusted by the vertical movement adjusting device 7 according to the thickness of the sheet metal Z to be processed.

Rotational drive unit 4 which constitutes the sheet metal feed mechanism 3.
In this embodiment, an electric type is adopted, and the upper and lower holding members 11, 11 and the lower holding member 1 are operated by operating the motor 41 capable of rotating in the forward and reverse directions in the forward and reverse rotation directions.
2, 2 and 12 can be rotated in mutually opposite directions. That is, the power from the single motor 41 causes the gear 4
Driving a lower shaft 45A horizontally installed in the lower horizontal frame 23 via 2, 43 and an upper shaft 45B horizontally installed in the upper horizontal frame 22 via the chain 44 so as to simultaneously and mutually reversely rotate. In addition, the lower shaft 45A and the upper shaft 45
The gear 46A (46
B) is attached, and from the respective gears 46A (46B) through the different gears 47A, 47A (47B, 47B) and gears 48A, 48A (48B, 48B), the upper clamping members 11, 11 and the lower clamping members. The holding members 12 and 12 are driven so as to rotate in opposite directions at a constant speed.

Therefore, the sheet metal feeding mechanism 3 operates the rotary drive device 4 while the sheet metal Z to be processed is clamped between the upper and lower clamping members 11, 11, 12, 12 to thereby operate the sheet metal Z to be processed. Can be moved in the arrow C direction or the arrow D direction.

The arc rotation operation mechanism 5 has a telescopic cylinder (air cylinder) 51 and a link device 52 for transmitting the power from the telescopic cylinder 51 to the movable unit 2. The link device 52 includes the first to fourth link pieces 53,
54, 55, 56 (there are a pair on the left and right respectively), and each of the link pieces 53 to 56 is assembled as shown in FIGS. 1, 3, 4, and 6. The arc rotation operation mechanism 5 is configured so that the work sheet metal Z clamped between the upper and lower clamping members 11 and 12 maintains a horizontal posture when the telescopic cylinder 51 is in the maximum extension state, as shown in FIG. Further, as the telescopic cylinder 51 shrinks, the movable unit 2 as a whole is arc-rotated upward in the circumferential direction with respect to the sheet metal feeding direction about the lower surface front edge of the upper holding member 11 as the center P.

As shown in FIG. 3, the support base 6 includes a lower base plate 3
2 has a substantially same shape and size, and a flat portion having a small width T (T = 30 to 40 mm) is formed on the upper surface thereof as shown in FIG. The upper surface of the support base 6 is positioned and used at substantially the same height as the upper surface of the lower base plate 32 during the sheet metal bending work as shown in FIG. The support base 6 can be finely adjusted in the vertical direction by a blade advancing / retreating operation mechanism 9 for moving the disc blade 81 of the cutting device 8 up and down by a small height, as will be described later.

The cutting device 8 includes the above-mentioned upper holding members 11, 1
1 and a disc blade 8 having the same diameter as the upper clamping members 11, 11.
1, 81 (there are two left and right) and the respective disc blades 81, 81
And a rotation drive device 82 for rotating. The disc blades 81, 81 are axially supported on the side surfaces of the support base 6 at equal intervals to the left-right direction (arrow C-D direction) between the upper holding members 11, 11. Also, the rotary drive device 8
2 is power from a motor 83 mounted on the side surface of the support base 6, and is sequentially passed through a first gear 84, second gears 85 and 85 (left and right pair), and third gears 86 and 86 (right and left pair). The disc blades 81 and 81 can be rotated in the same direction. The third gears 86, 86 have the same diameter as the disc blade 81 or slightly smaller than that (for example, 0.5 to 1 m).
(about m) formed with a large diameter, and each of the disc blades 8
It is attached in the state of being joined to the arrow A side of 1, 81 and coaxially with the disc blade 81. Also, the third gear 86,
86 and the disc blades 81, 81 are mounted so that their upper surfaces are substantially flush with the upper surface of the support base 6 or slightly above (eg, about 0.5 mm) above.

Then, the supporting table 6 with the disc blade 81
Means that each of the disc blades 81, 81 has the lower holding member 12, 1.
The vertical guides 94, 94 of the blade advancing / retreating operation mechanism 9, which will be described next, are mounted so as to be vertically slidable in a state of being close to and facing the position 2. The disc blades 81, 81 are rotated at the same speed and in the opposite direction to the upper clamping members 11, 11 by the rotation drive device 82.

By rotating the handle 91, the blade advancing / retreating operation mechanism 9 can move the entire support base 6 with the disc blade up and down along the pair of left and right vertical guides 94, 94 by a very small height. There is. Vertical guides 94, 94
2 and 3, as shown in FIG. 2 and FIG.
It is fixed to each side plate 16, 16. A pair of left and right screw bolts 93, 93 are screwed onto the support base 6. The screw bolts 93, 93 are rotated via the gear devices 92, 92 driven by the handle 91. The blade advancing / retreating operation mechanism 9 rotates the handle 91 clockwise or counterclockwise to rotate the screw bolts 93, 93 via the gear devices 92, 92, thereby causing the support base 6 to move the vertical guides 94. , 94, and can be moved up or down. It should be noted that the blade advancing / retreating operation mechanism 9 may be provided with a lock mechanism that prohibits rotation of the handle 91.

The sheet metal working machine of the illustrated embodiment is used as follows. First, when bending the sheet metal Z to be processed, the height of the upper base plate 31 is adjusted by the vertical movement adjusting device 7 according to the plate thickness of the sheet metal Z to be processed, and the upper holding member is held. The distance between the lower surface of 11, 11 and the upper surface of the lower holding members 12, 12 is adjusted. Further, the upper and lower surfaces of the support base 6 are positioned at substantially the same height as the upper surface of the lower base plate 32 as shown in FIG.

Then, in this state, the tip end side of the sheet metal Z to be processed is positioned in a state where the length direction for forming the folding curve is directed in the direction of arrow CD, and at the position to be bent, the upper holding member 11 is provided.
The sheet metal holding surface is pressed and clamped between the upper and lower holding members 11 and 12 on the front side in a state of being matched with the front end portion (blade edge forming portion) 11a (the non-holding side portion of the work sheet metal is placed on the support base 6). It is posted). At this time, as the final shape to be bent, for example, in the case of forming a trough shape having a U-shaped cross section, the one end side is previously designated as Zd (FIGS. 1 and 6) as the work sheet metal Z to be bent. Even when a bent upper part (or lower part) is used as shown by, the bent portion Zd is located between the upper horizontal frame 22, the lower horizontal frame 23, and the vertical frame 24 of the mounting base 21. Since it is accommodated in the formed space 25, the bent portion Zd does not collide with the constituent members of the sheet metal working machine.

Subsequently, the sandwiched work sheet metal Z
Telescopic cylinder 51 of arc rotation operation mechanism 5 according to the plate thickness of
Is reduced by an appropriate length, and the entire movable unit 2 is inclined by an appropriate angle range (for example, an angle of 45 ° as shown by the chain line shown by reference numeral 2'in FIG. 5 or by the solid line shown by reference numeral 2 in FIG. 6). . Then, the processed sheet metal Z
Zc between the upper and lower clamping members 11, 12 in
The non-clamping side portion Zb is supported by the upper surface of the support base 6 and the upper surface of the lower base plate 32 has an appropriate width (30 to 40 mm) in the direction of arrow AB, so that it can be easily folded. Can be tuned. At this time, the arc rotation center P of the movable unit 2 is set to the upper holding member 11 in the sheet metal holding portion Zc.
Since it is located at the lower end portion 11a of the lower surface, it can be bent smoothly with a comparatively small bending force, and sharp corners can be obtained.

Next, the motor 41 of the rotary drive unit 4 is moved forward (or reverse) with the movable unit 2 tilted as it is.
Driven in the rotating direction, both upper and lower clamping members 11, 11, 1
2 and 12 are rotated in mutually opposite directions, and the motor 83 of the cutting device 8 also drives the disc blades 81, 81 (and the third blade).
The gears 86, 86) are driven so as to rotate in the same direction as the lower holding member 12. Then, the work sheet metal Z clamped between the upper and lower clamping members is sequentially fed in the direction of arrow C by the feeding action of the holding unit 10 and the feeding action of the third gears 86, 86 on the support base 6 side. At that time, the sheet metal holding part Zc
Are sequentially bent at a predetermined angle (for example, 45 °). Then, at the time when the bending of the sheet metal Z to be processed to the trailing side end portion is completed (the trailing side edge portion of the sheet metal Z to be processed is still sandwiched between the upper and lower sandwiching members), the rotation driving device 4 is rotated. The motor 41 is stopped. In this state, the sheet metal Z to be processed is bent over its entire length by a predetermined angle (for example, 45 °).

When the sheet metal Z to be processed is further bent, the upper and lower clamping members 11, 11, 12,
The telescopic cylinder 5 of the arc rotation operation mechanism 5 while holding the end portion of the sheet metal Z that has been primarily preliminarily bent between the 12 pieces.
1 is further reduced by one step to further incline the movable unit 2, and then the motor 41 of the rotary drive device 4 and the motor 83 of the cutting device 8 are respectively rotated reversely (or positively),
The sheet metal Z that is primarily bent in the same manner as above
Is bent to an angle deeper than that (in the illustrated example, the movable unit 2 is arc-rotated to the position of reference numeral 2'as shown by the chain line in FIG. 6 to bend the sheet metal to an angle of 90 °. Can be done). In addition, when the plate thickness of the sheet metal Z to be processed is large, the bending angle for one time is made small (for example, an angle of 2).
It may be bent at a predetermined angle in several steps.

Further, when cutting the sheet metal Z to be processed, the handle 91 of the blade advancing / retreating operation mechanism 9 is operated to raise the upper surface of the disk blade 81 to the height of the lower surface of the upper holding member 11 as shown in FIG. Up to this point, in that state, the sheet metal Z to be machined between the upper and lower clamping members 11 and 12 in the same manner as in the bending work described above.
After inserting the front end portion of the position to be cut, the motors 41 and 83 of the rotation driving device 4 and the cutting device 8 may be driven. Then, as the sheet metal Z is moved to the arrow C side by the feeding action of the upper and lower clamping members 11, 12 and the third gear 86, the sheet metal Z near the clamping portion Zc of the sheet metal Z becomes the upper clamping member 11. Due to the shearing action with the disc blade 81, the blades are sequentially cut in a straight line. When the sheet metal Z to be processed has been cut over the entire length, the motor 4
Stop 1,83.

As described above, in the sheet metal working machine of this embodiment, one machine has both the bending function and the cutting function of the sheet metal, and the switching between the bending operation and the cutting operation is performed by the blade advancing / retracting operation. Since the mechanism 9 can be operated only by moving the disc blade 81 back and forth, the usability is good and the holding unit 1
There is an advantage that the upper holding member 11 of 0 can be used for both bending and cutting the sheet metal.

Further, since the mounting base 21 is formed with a large volume space 25 in the front-rear direction (direction of arrow AB) and in the up-down direction, not only the sheet metal Z to be machined but also the plate-shaped one is bent in advance. Even if it has a bent portion, it can be bent freely, and one sheet metal can be bent at a plurality of locations.

[Brief description of drawings]

FIG. 1 is a side view of a sheet metal working machine according to an embodiment of the present invention.

2 is a plan view of the sheet metal working machine of FIG. 1. FIG.

FIG. 3 is a view on arrow III-III in FIG. 1.

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is a partially enlarged sectional view of the sheet metal working machine of FIG. 1. FIG.

6 is a state change diagram at the time of bending the sheet metal in the sheet metal processing machine of FIG.

FIG. 7 is a partial cross-sectional view showing a usage state when cutting the sheet metal in the sheet metal processing machine of FIG.

FIG. 8 is a side view of a known sheet metal working machine (sheet metal bending machine).

9 is an explanatory view of the operation of the sheet metal working machine of FIG.

[Explanation of symbols]

1 is a base, 2 is a movable unit, 3 is a sheet metal feed mechanism, 4 is a rotary drive device, 5 is an arc rotation operation mechanism, 6 is a support base, 7 is a vertical movement adjusting device, 10 is a clamping unit, and 11 is an upper unit. Clamping member, 12 is a lower clamping member, 21 is a mount, 22 is an upper horizontal frame, 23 is a lower horizontal frame, 24 is a vertical frame, 25 is a space portion, P is an arc rotation center, Z is a sheet metal to be processed, Zb. Is the outer part of the sheet metal, Z
c is a sheet metal sandwiching portion, and Zd is a sheet metal bent portion.

Claims (1)

[Claims] 1. A sheet metal (Z) to be bent is sandwiched from both front and back sides at a front end of a mounting table (21) mounted on a base table (1) so as to be vertically arcuately rotatable. A pair of upper and lower clamping members (11,
A rotary unit (4) for mounting a sandwiching unit (10) having 12) and rotating the pair of upper and lower sandwiching members (11, 12) in mutually opposite directions. By rotating the sandwiching members (11, 12) in mutually opposite directions, the sandwiching members (1
1, 12) a sheet metal feed mechanism (3) configured to sequentially move a sheet metal (Z) which is sandwiched and held between the sheet metal (Z) and the pair of upper and lower clamping members (11, 12).
An arc rotation operation mechanism (5) for rotating the clamping unit (10) in the circumferential direction in the circumferential direction with respect to the sheet metal feeding direction around the sheet metal clamping section (Zc) as a center (P), and the sheet metal ( Sheet metal working including a holding portion (Zc) of the holding unit (10) in the sheet metal (Z) to be processed and a support base (6) for supporting an outer side portion (Zb) in the bending operation of Z). In the machine, the mounting base (21) includes an upper lateral frame (22) to which an upper holding member (11) of the holding unit (10) is attached, and a lower holding member (12) of the holding unit (10). And a vertical frame (2) connecting the upper horizontal frame (22) and the lower horizontal frame (23) at their rear side.
4) and a U-shape in a side view, and a portion surrounded by the upper horizontal frame (22), the lower horizontal frame (23) and the vertical frame (24) in the mounting base (21),
A sheet metal (25) having a large volume in the front and rear and up and down for accommodating one end side (Za) of the sheet metal (Z) sandwiched by the sandwiching unit (10). Processing machine.