JPS6116530B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is directed to processing plate materials (workpieces) in a bending machine.
This is a front positioning device that automatically bends the four sides of a single workpiece by automatically determining the width (perpendicularity), rotating the workpiece on a horizontal plane, and feeding the workpiece by a fixed length on the work table. The purpose is to improve the performance of the equipment and enable the application of a flexible production system for the bending process. Cabinets, show cases, vending machines,
Freezers, refrigerators, panels, sinks, switchboards, etc. are made of metal plates whose edges are bent into a U-shape or Z-shape. In order to bend the workpiece in this way, a wing bender, a coki bender, or a press brake is usually used to sequentially bend the four sides of the workpiece. For example, as shown in Fig. 14, one short side 1 of the work 10
After bending the edge of 0a into two stages (short side bending), rotate the workpiece 180 degrees on the work table (handling table) and bend the other short side 10b, and then bend the workpiece 90 degrees. Rotate 1 degree
Bending the edge of the long side 10c (long side bending), and
By rotating 180 degrees and bending the other long side 10d, each of the four sides is folded into a U-shape by first bending E and second bending H, as shown in Figure 13. A rectangular product with a bent width W and length L was obtained.

As mentioned above, it is necessary to rotate the workpiece by 90°, 180°, or 270° in the horizontal plane each time you bend each side on the work table. It is dangerous to do this at work. For this reason, while an electromagnet is suspended above the work table, a shuttle mechanism is installed on the workpiece feeding side, the workpiece is rotated at the desired angle at the workpiece lifting position, and after descending to the table surface, the workpiece is pushed forward by the shuttle mechanism. Although such devices are known, the equipment and operating costs are high, and the cost of the product is inevitably high.

Therefore, in the present invention, the above-mentioned drawbacks are eliminated by eliminating the electromagnetic work rotation mechanism and providing a work rotation mechanism using a rotary table that can freely move in and out of the perspective line of the work table. In other words, there is a width determining mechanism on the work table that determines the width of the work (perpendicular alignment), a gap is formed in the center of the table, a feed mechanism that advances and retreats the work into this gap, and a rotary table that can be raised and lowered. Incorporates a work rotation mechanism by
This automatically determines the width of the workpiece on the work table (squares it up), presses it against the abutting piece, retreats, and rotates it, thereby ensuring the front position of the workpiece.

Further describing the structure of the present invention, the work table is arranged on the left and right sides with a gap in the center of the table, and a large number of ball casters are attached to the upper surfaces of the left and right tables to form perspective lines at the same level. The width determining mechanism includes a linear movement mechanism that moves movable members at the front of the work table in opposite directions, a pair of arms that project from the movable member in parallel to the top surface of the table, and a plurality of arms that are attached to each arm. It has a cylinder and a group of guide rollers that are attached to the tip of the rod of the cylinder and can move toward and away from the perspective line of the work table. The workpiece rotation mechanism also includes a main shaft that is vertically installed at the lower center of the work table and can be raised and lowered and rotated freely, a strip-shaped rotary table fixed to the upper end of the main shaft, and a main shaft for raising and lowering the rotary table relative to the work table surface. It consists of a shift cylinder installed at the bottom of the rotary table, and a rotary drive unit for giving the rotary table angular rotation of 90°, 180°, or 270°.

Further, the present invention has a mechanism for feeding the workpiece on the work table to the bending position, but the workpiece feed mechanism in the first invention has a mechanism for feeding the workpiece on the work table to the bending position. It is composed of a screw rod, a head connected to the screw rod, a clamp provided at the front end of the head, and a screw rotation mechanism attached to the end of the screw rod. A belt conveyor is installed in parallel on the lower plane of the table along a gap formed in the center of the table, and the belt conveyor is attached to the plane of the working table so as to be able to move in and out. These feeding mechanisms feed a workpiece whose width has been determined to a fixed length to a folding line, and after bending, pull the workpiece back to the center of the rotating mechanism.

Next, the present invention will be specifically explained based on the drawings.

1 to 6 show a workpiece front positioning device according to a first embodiment of the invention, in which a wing bender is used as a bending machine.

The wing bender, indicated by reference numeral 1 in Figs. 1 and 2, has an upper die 2 attached to the lower part of the ram,
Processing plate material (work) with the lower mold 3 installed on the bed
10 and rotate the movable mold (wing type) 4 about 90 degrees as shown by the arrow with the fixed end of the work as the center of rotation to bend the edge of the work. The movable mold 4 is supported by shafts 5 at both ends of the bed, as shown in FIG. 2, and is rotated by the extension of a piston rod of a cylinder 7 attached to a beam 6. When bending a workpiece, the workpiece 10 is supplied from the work table (handling table) 20 on the left side of FIG.
By pressing the tip of the back gauge against the abutting piece 8 of the back gauge mechanism, the bending length (length of the straight side due to the rise during bending, ie, E or H in FIG. 13) is set.

Now, the workpiece front positioning device of the present invention is arranged in front of the wing bender 1, and is mounted on a work table 2 that supports the workpiece as described below.
0, a workpiece width determining mechanism 25, a workpiece rotation mechanism 40, and a feeding mechanism 60 are the main parts.

(Working Table) The working table 20 is arranged on the workpiece feeding side facing the abutment piece 8 across the bending die of the bending machine (wing bender). This table 20 is attached to the upper part of a frame 21 that is integral with or separate from the base portion of the wing bender 1, and is formed substantially symmetrically on the left and right sides with a gap 22 in the center of the table. Furthermore, a notch 23 is formed in the center of the gap 22 to avoid interference with a rotary table 44, which will be described later.

On the surface of the work table 20, as shown in an enlarged view in FIG. 5, a large number of ball casters 24 are arranged at regular intervals in a vertical and horizontal manner or in a staggered manner, and the workpiece is supported or moved on the plane formed by the top of each ball caster 24. A perspective line is formed.

(Work Width Determining Mechanism) This mechanism 25 moves the work 10 supplied to the work table 20 to the center of the table, and
A pair of movable members 2 that can reciprocate and are used to square the workpiece to the bending line.
Attach the arms to 6 and 26, and attach the arms to each arm 27 and 27.
A guide roller 30 that can be raised and lowered is attached to the shaft.

That is, as shown in FIGS. 1 and 4, guide members 31 and 32 are fixed vertically in parallel along the front portion of the frame 21. As shown in FIGS. The upper guide member 31 engages with the dovetail groove 33 of the movable member, and the lower guide member 32 engages the lower end of the movable member 26 with the groove 34 . Rack rods 35, 35 extend centrally inside the movable members 26, 26, respectively, and a pinion 36 that meshes with both the rack rods 35, 35 is attached to the center thereof, and one rack rod 35 has a cylinder for linear drive. Fix the piston rod 38 of 37. When the cylinder 37 is driven, the movable members 26 move linearly in opposite directions via a rack and pinion mechanism.

A pair of arms 27, 27 protrude from the movable members 26, 26 toward the table top surface parallel to the gap 21, and several (four in FIG. 2) cylinders 28 are fixed to each arm 27. The piston rod 29 is made to protrude downward, and the roller 30 is attached to the end of the rod as described above. This roller 3
Group 0 is rotatable with respect to the axis of the piston rod, and when determining the width, it contacts the end of the workpiece and brings the workpiece to the center of the table, and when feeding the workpiece after width determination in a direction perpendicular to the bending line, it moves parallel to the feeding direction. This is for guiding the end face of the workpiece. Also, when moving the work directly below the arm 27,
The cylinder 28 is operated backward to raise each roller 30 to a height away from the table's perspective line.

In the width determining mechanism 25, instead of the linear movement mechanism using a rack and pinion, a mechanism may be adopted in which the movable member and the arm are moved in opposite directions by rotation of left and right screw rods.

(Workpiece Rotation Mechanism) A workpiece rotation mechanism 40 is provided because four-side bending is necessary. When the work rotary table is moved under the surface of the work table, if the rotary table is made circular, it cannot be made into a large-diameter circular table due to the relationship with the feeding mechanism described later.

Therefore, the illustrated work rotation mechanism 40 incorporates a rotation table 44 that is shaped to fit within the gaps 22 and 23 of the work table 20. The rotary table 44 has a width that fits within the clearance, and has a width of 5 to 10 mm.
It has a rectangular shape with the length of the plate, and with the solid line in Figure 2 as its home position, it rotates 90°, 180°, or 270° at a position elevated above the table surface.

That is, as shown in FIGS. 1 and 2, a bearing 41 is provided on a frame 39 that projects forward from the frame 21, and a main shaft 42 that can rotate and move up and down is provided.
A rectangular rotary table 44 is fixed to the upper end of the shaft 42, and is coupled to a piston rod 46 of a shift cylinder 45 at the lower end. A plurality of permanent magnets 47 are embedded in the upper surface of the rotary table 44 as shown in FIGS. 2 and 6. A bracket 50 is provided from the inside of the front end of the frame 39, and an electric motor 51 for rotational drive is attached to the pinion 52 of the motor shaft.
and a gear 54 attached to the shaft 42 via a sliding key 53.

As shown in FIG. 6, the rotary table 44 normally stands still below the level of the work table 20, and is raised by a stroke s when the shift cylinder 45 is driven. For example, assume that the thickness of the rotary table 44 is k = 10 mm, the work table thickness m = 5 mm, the distance between the lower surface of the work table and the upper surface of the rotary table in the lowered position n = 5 mm, and the rotary table is raised as shown by the chain line in FIG. If the height from the top surface of the work table to the top surface of the rotary table is h = 20 mm when
The stroke s of the rotary table 44 needs to be 30 mm. By setting the stroke in this manner, the rotary table 44 is stored in the gap 22 or 23 when descending, and can be rotated by a predetermined angle without interfering with the work table 20 when ascending.

In order to increase the work holding power of the rotary table 44, a permanent magnet is embedded in the surface of the rotary table 44, but in preparation for the case of a light metal work other than an iron plate, the surface of the rotary table may be roughened to have a large coefficient of friction with the work. Alternatively, a clamp plate (not shown) may be provided from the upper center of the rotary table to clamp and rotate the rotary table.

(Work Feed Mechanism) This mechanism 60 feeds the workpiece 20 whose width has been determined by a fixed distance to the bending line, and after bending, pulls the workpiece back to the center of the rotating mechanism. As shown in Fig. 4, screw rods 61, 61 are mounted side by side on the lower surface of the table along the gap in the center of the work table, a head 63 connected to the screw rod, and a clamp 65 provided at the front end of the head. , and a screw rod rotation mechanism 68 are the main parts.

Race 62 on the outside of screw rod 61, 61,
62 is arranged, and a head 63 is slidably mounted thereon. A bracket 64 is provided on the upper part of the head 63, and a clamp cylinder 66 for raising and lowering the clamp 65 is attached thereto, and the lower part of the head 63 has female screw portions 67, 67 which are screwed into the screw rods 61, 61. The screw rod rotating mechanism 36 is driven by an electric motor 69 fixed to the rear end of the frame 49.
and a transmission member 72 passed between the pulley 70 of the motor shaft and the pulley 71 of one screw rod 61.
and a group of gears 73, 7 provided between both screw rods.
4,75. The head 63 is raced by rotating the electric motor 69 in the forward or reverse direction.
2, 62 can be advanced or retracted.

(Function) As shown by the arrow 80 in FIG.
A workpiece is fed from the front of 0, and the bent product is discharged in the direction of arrow 82. The workpieces 10 supplied on the work table have different resting positions on the table and angles with respect to the bending line, so first, the width determining mechanism 25 is activated to move the workpieces to the center of the table, and at the same time bend the workpieces. Align the line at right angles and position it.

That is, as shown in FIGS. 1 and 3,
The cylinder 37 for linear motion provided at the front lower part of the table is operated, and the racks 35, 35 and pinion 36 are
The movable members 26, 26, which are arranged opposite to each other, are driven in a direction toward each other. Both movable members 26,
26 has arms 27, 27 equipped with a group of 30 rollers that are lowered to a position where they can contact the end surface of the workpiece, so that the workpiece 10 is guided by the rollers as shown by the two-dot chain line in FIG. It is then brought to the center of the work table 20 and squared to the bending line. During this width adjustment, the workpiece is smoothly moved by casters 24 on the table.

Note that it is also possible to supply the work in the direction of the dotted line arrow 81 on the left in FIG. 2 and discharge it in the direction of the arrow 82 on the right. In that case, it is necessary to keep at least the roller 30 attached to the arm on the work supply side floating. That is, the cylinders 28 attached to the arm 27 are moved backward all at once to raise the rollers at the lower end of the piston rod, leaving a space between the upper surface of the work table 20 and the rollers 30 so as not to interfere with the traveling of the supplied workpiece 10. Make it. The workpiece 10 is moved to approximately the center of the table 20 passing under each roller and once stopped. Next, the cylinder 28 is operated toward the approach side to lower each roller 30 to a position very close to the parse line so that each roller touches the end surface of the workpiece, and the rack and pinion mechanism is operated to reduce the width as before. All you have to do is make a decision.

After determining the width, clamp the rear end of one of the short sides of the workpiece, operate the feed mechanism 60, apply the tip of the workpiece to the abutment piece 8, feed it by a fixed length, lower the ram, and move the upper and lower sides. The mold is held down and the wing mold 4 is rotated to perform the first bending. This feeding operation will be described based on FIG. 1.
The case where is at the left end of the figure is shown. electric motor 69
and drives the screw rod 6 via pulleys 70, 71, transmission member 72, and gears 73, 74, 75.
1 and 61 are rotated synchronously to advance the head 63, and when the head touches the rear end of the workpiece, the head 63 is temporarily stopped and the cylinder 66 is actuated to cause the clamp 65 to clamp the rear end of the shorter side of the workpiece. By driving the electric motor 69 again in this state and moving it forward, the workpiece 10 can be fed by a fixed length in a direction perpendicular to the folding line. As the ram descends, the upper and lower dies 2 and 3 hold the workpiece, and the rotation of the wing die 4 causes the first stage of bending, and after opening the mold, the electric motor 69 is driven again to abut the workpiece for the second stage, hold the workpiece, bend it, Finish bending one short side by opening the mold. Next, the electric motor is reversed, the center of the workpiece 10 is pulled back to the center of rotation of the rotation mechanism 40, the cylinder 66 is switched to the back side and unclamped, and the head 63 is moved backward. In this state, the shift cylinder 45 is operated to raise the rotary table 44. In the raised position, the electric motor 51 is driven, the rotary table is rotated via the gears 52 and 53, and the workpiece 10 is rotated 180 degrees. After the rotation is complete, determine the width and make it perpendicular to the bend line. Next, the head 63 is brought close to the short side that was bent into a U-shape and clamped. The feeding mechanism 60 is then driven to feed the other short side by a fixed length, and as before, press the mold, bend it, and open the mold to bend it in 1st and 2nd stages, forming a U-shape on both short sides. Finish the bending process.

After bending the short side, move on to processing the long side. First, the workpiece 10 is returned to the center of the rotation mechanism 40 and rotated 90 degrees from the normal position as shown by the dashed line in FIG. Shift cylinder 45 when rotating the workpiece
is operated to the approach side to raise the main shaft 42 and rotary table 44, drive the electric motor 51 in the raised position to rotate the workpiece 90 degrees, return the cylinder 45 to the back side, and place the workpiece 10 stationary on the work table. place After it is left standing, the width determining mechanism 25 is used to square it, and the feeding mechanism 60 is activated.
One-stage and two-stage bending on one long side is performed by abutting the tip, pressing the mold, rotating the mold, and opening the mold. Next, move the work backward, rotate the workpiece again by 180°, and open the mold below the tip abutment to remove the first and second stages on the other long side.
Perform step bending. After both long sides are bent, the workpiece is rotated 90 degrees and discharged in the direction of arrow 82.

By repeating the above operations, the four sides of the supplied workpiece can be successively bent to produce a product as shown in FIG. 14.

Next, a second embodiment of the invention will be described with reference to FIGS. 7 to 12.

In the figure, 11 is a press brake, 12 is a ram, 1
3 is a bed, 14 is an upper mold (punch), 15 is a lower mold (die), and 16 is a front positioning device of this embodiment arranged in front of the press brake, which includes a work table 20 and a workpiece width determining mechanism. 25, a workpiece rotation mechanism 40, a feeding mechanism 84, and a workpiece bending follow-up mechanism 90.

The table, width determining mechanism, and rotation mechanism in this device are substantially the same as those in the embodiment shown in Figs.
A detailed explanation thereof will be omitted. The following will explain the feed mechanism and the workpiece following mechanism in preparation for the workpiece being lifted up during bending by the press brake.

(Feeding Mechanism) As shown in FIGS. 6 and 7, the feeding mechanism 84 is composed of two belt conveyors that are placed in parallel at the bottom of the table along the gap 22 formed in the center of the work table 20. It is a floating conveyor type in which a driving pulley 86 on the rear side of the work table can be moved up and down around a driven pulley shaft 85 on the front side of the work table, that is, on the press brake 11 side. A magnetic sheet is attached to the belt 87 to increase the pressing force against the workpiece and improve the striking ability. In the figure, 88 is a driving electric motor, and 89 is a floating cylinder.

The belts 87, 87 are stretched at intervals, and a strip-shaped rotary table 44 is installed at a fixed position between them. The rotary table 44 has first to second
As mentioned in the figure, the shift cylinder 45
The workpiece 1 rises due to the drive of the electric motor 51.
0 by a predetermined angle. The belt 87 is inclined from the driven pulley 85 to the driving pulley 86 as shown in FIG. It is designed so as not to obstruct the movement of the workpiece above. Then, the floating cylinder 89 is activated to raise the driving side and the entire surface of the belt protrudes slightly beyond the work table 20, thereby directly supporting the work on the table and feeding the work by driving the electric motor 88. We are equipped to do so.

(Workpiece Following Mechanism) When bending with a press brake, the rotating side of the workpiece springs up, so a workpiece following mechanism is indispensable to support this. Workpiece following mechanism 90 of this embodiment
is installed in the gap 22 in the center of the table, and its follower arm 97 is attached to the conveyor belt 8.
7 are arranged in parallel outside. However, the lever follower mechanism 90 is shown in FIGS. 7, 8 and 10.
As clearly shown in the figure, a link mechanism 91 that can rotate around the rotational fulcrum of the workpiece and a follower arm 97
The main parts are a drive lever 98, a slider 100 attached to the drive lever, and a drive cylinder 102 with a piston rod pivotally connected to the slider.

The link mechanism 91 consists of arms 92-95. The first arm 92 extends diagonally rearward from a main shaft 96 supported inside the frame 21, and the second arm 93 extends from a fulcrum b below the main shaft to the arm 9.
It extends parallel to 2. The third arm 94 is bent in a dogleg shape from the fulcrum c on the press brake side of the follower arm 97 and hangs downward, and the third arm 94 is connected to the first arm at the bending point g.
The lower end of the second arm 93 is connected with a pin at the tip f of the second arm 93. The fourth arm 95 is pin-coupled from the fulcrum d of the follower arm 97 to the tip e of the first arm 92 . In this link mechanism, the center of the main shaft 96 is a, and the V-groove inner edge j of the lower die 15 is the pivot point.
a, b, f, g, c, d, e, g and a, g,
The lines connecting c and j each form a parallelogram.

The main shaft 96 has an arm 92, as shown in FIG.
A drive lever 98 is attached at a position that is centered between the arms 92 and out of phase with the arm 92.
A guide hole 99 is provided in this drive lever 98, and a slider 100 is inserted therein. The slider 100 is pivotally connected to the tip of a piston rod of a follow-up drive cylinder 102 supported by a bracket 101 inside the frame 21. The cylinder 102 operates the piston rod at a speed that maintains a predetermined proportional relationship with the ram descending speed so that the rotational angular velocity of the follower arm 97 and the rotation of the workpiece extension are equal to each other when bending the workpiece. It's getting old.

As shown in FIG. 10, the follower arm 97 is buried in the lower surface of the work table 20 with its rear part slightly inclined.As the ram lowers and bends the workpiece, the piston rod extends, and the follower arm 97
7 supports the workpiece by rotating upward about the rotation fulcrum j.

(Function) The work 10 supplied from one side of the work table 20 is squared and positioned by the operation of the width determining mechanism 25, as in the previous embodiment.
Next, the floating cylinder 89 is activated to raise the entire surface of the belt above the surface of the work table to support the workpiece, and the electric motor 88 is driven to feed the workpiece by a fixed length to complete the first and second bending steps on one short side. The belt 87 is reversed to move the workpiece to the center of the rotating mechanism 40, the belt 87 is once submerged under the table, the rotary table is rotated 180 degrees from the normal position, the belt is driven again, and the first step on the other short side, Perform two steps of bending. Next, return the workpiece to the center of the rotating mechanism, rotate it 90 degrees, feed it a fixed length, bend one long side, rotate it 180 degrees, feed it a fixed length, bend the other long side, and make the four sides into a U-shape. The product is folded. As mentioned above, when the workpiece is rotated, the floating cylinder 89 is operated backward to tilt the rear side of the belt 87 as shown in FIG. Do it like this. Also,
When bending each side in one or two stages, the rotating end side of the workpiece moves away from the table and rotates significantly, but the follow-up mechanism 90 works in synchronization with the lowering of the ram. That is, as the piston rod expands as the cylinder 102 operates, the slider 100 moves upward at a constant speed while being guided by the guide hole 98, and the link mechanism 91 moves through the main shaft 96 that is integrated with the drive lever 98.
The workpiece is rotated and the follower arm is used to accurately follow the workpiece while maintaining the initial contact state.

(Effects) As described above, according to the present invention, the width determining mechanism is activated for the workpiece supplied on the work table to center the workpiece and at the same time align it at right angles to the bending line, making it easy to position the workpiece. This makes it possible to accurately perform one-step, two-step bending, etc. of the upright portion of the edge. In addition, a rotary table is installed in the center of the work table so that it can move in and out of the table surface, and the workpiece can be rotated by 90°, 180°, or 270° in the horizontal plane, making it possible to quickly rotate the workpiece during bending work. And it can be done safely.

Furthermore, the work table has a gap that does not interfere with the rotary table, and a workpiece feeding mechanism is provided that includes a screw rod mounted on the lower surface of the table along this gap and a clamp that can be moved in the longitudinal direction of the gap by rotation of the screw rod. This feature ensures that the width-determined and perpendicular workpiece is fed by a fixed distance to the folding line, and after bending, the workpiece is pulled back to the center of the rotation mechanism and the other short or long sides of the workpiece are It is possible to perform the sequential bending work with high efficiency. In addition, in the second invention, a belt conveyor that can be freely retracted into the above-mentioned gap is incorporated as a feeding mechanism, so that the belt conveyor floats slightly above the perspective line of the work table when feeding a workpiece or pulling back a workpiece. Not only can the workpiece be moved smoothly by bending the workpiece, but also when the workpiece is being folded, rotated, carried into the worktable, or taken out after the bending is completed, it will not fit into the gap at the bottom of the worktable. Since the belt conveyor does not come into contact with the work, it is possible to efficiently produce four-sided bent products that allow these operations and processes to proceed without any problems.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment in which the workpiece front positioning device of the first invention is applied to a wing bender. 4 is a front view taken from the - line in FIG. 1 in the direction of the arrow; FIG. 5 is an enlarged sectional view of the work table;
FIG. 6 is a sectional view showing the relationship between the rotary table and the work table, and FIGS. 7 to 12 show an embodiment in which the second invention is applied to a press brake. 8 is a plan view, FIG. 9 is a sectional view taken along the - line in FIG. 7, FIG. 10 is a side view showing the workpiece following mechanism with the feed mechanism and rotary table omitted, and FIG. 11 is the workpiece following mechanism. 12 is a side view taken along the line XII--XII in FIG. 11 in the direction of the arrow, FIG. 13 is a perspective view of the product, and FIG. 14 is a perspective view of the workpiece. 1: Wing bender, 8: Abutment piece, 10: Workpiece, 11: Press brake, 20: Work table, 22, 23: Clearance, 24: Ball caster, 25: Width determining mechanism, 26: Movable member, 27:
Arm, 28: Roller lifting cylinder, 30: Guide roller, 40: Work rotation mechanism, 42: Main shaft, 44: Rotary table, 45: Shift cylinder, 47: Permanent magnet, 51: Rotation drive section, 60:
Work feed mechanism, 61: Screw rod, 6
3: Head, 65: Clamp, 68: Screw rod rotation mechanism, 87: Belt, 90: Workpiece following mechanism, 91: Link mechanism, 97: Following arm, 9
8: Guide hole, 100: Slider, 102: Following drive cylinder.

Claims (1)

[Claims] 1. A work table disposed on the work feed side facing the abutment piece across the bending die of the bending machine, and an arm that moves in opposite directions on the left and right sides on the upper surface of the work table. a width determining mechanism that brings the workpiece supplied to the table to the center of the table and aligns the workpiece at right angles to the bending line; a gap of a predetermined width formed in the center of the work table in a direction perpendicular to the bending line;
comprising: a work rotation mechanism that includes a rectangular rotary table that fits within the width of the gap and rotates a predetermined angle at a position elevated from the surface of the work table; and a work feed mechanism that is arranged along the longitudinal direction of the gap of the work table; The work table is arranged on the left and right through a gap in the center of the table, and a large number of ball casters are attached to the upper surfaces of the left and right tables to form perspective lines at the same level, and the width determining mechanism is arranged in front of the work table. a linear motion mechanism for moving movable members in opposite directions to each other; a pair of arms protruding from the movable member in parallel to the top surface of the table; a number of cylinders attached to each arm; a group of guide rollers that can move toward and away from the perspective line of the work table;
A rectangular rotary table fixed to the upper end of the main shaft,
It is composed of a shift cylinder provided at the lower part of the main shaft for raising and lowering the rotary table relative to the work table surface, and a rotation drive section for giving the rotary table angular rotation of 90°, 180° or 270°; The feeding mechanism includes screw rods that are parallel to each other on the lower surface of the table along the gap in the center of the work table, and a head that is connected to the screw rods.
1. A workpiece front positioning device for a bending machine, comprising clamps provided at the front and rear of the head and a screw rotation mechanism attached to the end of the screw rod. 2. A work table placed on the work feed side facing the abutting piece across the bending die of the bending machine, and a work supplied with an arm that moves in opposite directions to the left and right on the upper surface of the work table. a width determining mechanism for aligning the workpiece to the center of the table and aligning the workpiece at right angles to the bending line; a gap of a predetermined width formed in the center of the work table in a direction perpendicular to the bending line;
a work rotation mechanism that includes a strip-shaped rotary table that fits within the width of the gap and rotates a predetermined angle at a position elevated from the surface of the work table; and a work feed mechanism that is arranged along the longitudinal direction of the gap of the work table; The work table is arranged on the left and right through a gap in the center of the table, and a large number of ball casters are attached to the upper surfaces of the left and right tables to form perspective lines at the same level, and the width determining mechanism is arranged in front of the work table. a linear motion mechanism for moving movable members in opposite directions to each other; a pair of arms protruding from the movable member in parallel to the top surface of the table; a number of cylinders attached to each arm; a group of guide rollers that can move toward and away from the perspective line of the work table;
A rectangular rotary table fixed to the upper end of the main shaft,
It consists of a shift cylinder installed at the bottom of the main shaft to raise and lower the rotary table relative to the work table surface, and a rotation drive unit to give the rotary table angular rotation of 90°, 180°, or 270°; The feeding mechanism is a belt conveyor that is arranged in parallel on the lower plane of the table along a gap formed in the center of the work table, and the belt conveyor is attached to the plane of the work table so that it can freely appear and retract. Workpiece front positioning device for bending machine. 3. A workpiece front positioning device for a bending machine according to claim 1 or 2, wherein the bending machine is an Ungbender. 4. A workpiece front positioning device for a bending machine according to claim 1 or 2, wherein the bending machine is a coki bender. 5. A workpiece front positioning device for a bending machine according to claim 1 or 2, wherein the bending machine is a press brake. 6. The rotary table has permanent magnets embedded in several places on the top surface of the rotary table according to claim 1 or 2.
A workpiece front positioning device for the bending machine described in Section 2. 7. The workpiece front positioning device for a bending machine according to claim 1 or 2, wherein the rotary table has an upper surface having a large coefficient of friction with respect to the back surface of the workpiece. 8. A workpiece front positioning device for a bending machine according to claim 2, wherein the belt of the feeding mechanism has a magnetic sheet attached thereto.