JPS646848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a panel former for folding the ends of a rectangular worksheet (metal plate material).

[Prior Art] A panel in which each end of each of the four sides of a rectangular worksheet (hereinafter referred to as a work) is bent once or twice or more is used in cabinets, show cases, vending machines,
Used in freezers, refrigerators, air conditioners, computer units, etc. In order to make such a panel, the four sides of the workpiece are sequentially bent using two or more wing benders, cokibenders, press brakes, or the like, each having different mold lengths for the long and short sides. For example, as shown in Figure 14, workpiece 6
After bending the edge of one short side 61 of 0 (short side W x long side L) into two steps (short side bending), rotate the workpiece 180 degrees on the handling table and fold the other short side. Perform 62 short piece bends, then bend the workpiece 90
As shown in FIG. A rectangular product with a width W and a length L was obtained by bending four pieces into a U-shape by the first stage bending E and the second stage bending H.

As mentioned above, the workpiece is placed on the handling table, and each side is bent by 90° in the horizontal plane.
It is necessary to perform a rotation of 180° or 270°, and it is dangerous to manually press the abutment piece together with this rotational operation. 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;
It was unavoidable that the cost of the product would rise.

In order to improve these shortcomings, the special public
In Publication No. 41132, a handling table is provided in front of a bending press capable of upward bending and downward bending, and a yoke-shaped moving body that moves back and forth in a direction perpendicular to the bending line is installed, and a workpiece gripping and rotating body is attached to the tip of the moving body. This patent discloses a device that is equipped with a mechanism to eject, bend, and rotate a workpiece using a single machine to efficiently bend four sides.

[Problems to be Solved by the Invention] However, the device shown in the above-mentioned Japanese Patent Publication No. 58-41132 allows a yoke-shaped moving body placed on a base to be moved back and forth directly by a hydraulic cylinder, Since the linear displacement of the body is determined by a mechanical program controller, when bending each side, the yoke-shaped moving body is moved back to the position where the maximum workpiece can rotate, and from there it is approached to the bending line. As a result, there was a problem in that the takt time was long and there was a limit to productivity improvement.

In view of the above points, it is an object of the present invention to provide an apparatus that shortens the tact time for four-side bending and performs the bending process at high speed when bending the end portion of a workpiece using one machine.

[Means for Solving the Problems] In order to achieve the above object, the present invention releases the grip on the workpiece while keeping the yoke stopped after rotating the workpiece, and operates the pusher to advance the workpiece to the bending line. It was designed to let you do so. That is, the present invention is an apparatus that grasps the center of a workpiece and moves it forward and backward along a folding line, and rotates the workpiece at a predetermined angle using a rotating unit to sequentially bend the four side edges. A yoke is attached to move forward and backward in a direction perpendicular to the folding line, a rotation unit is installed at the tip of the yoke to grip the center of the workpiece and rotate the workpiece, and a rotary unit is installed at the tip of the yoke to rotate the workpiece by gripping the center of the workpiece. The present invention relates to a panel former characterized in that it is equipped with a pusher mechanism attached to the side of a rotating unit.

The pusher mechanism has a pusher member fixed to the forward side of an endless chain extending horizontally across the lower arm of the yoke, and a chain gripping member connected to the tip of the piston rod of the cylinder on the return side of the endless chain. There is. When the chain gripping member is stopped at the return position of the cylinder and the yoke is moved, this pusher member comes into contact with the rear part of the workpiece and can then be pushed to the bending position at twice the speed of the movement of the yoke. Furthermore, when the workpiece is rotated, by operating the cylinder to the approach side end, the workpiece can be moved to a position outside the maximum rotation radius to avoid interference with the workpiece during rotation. The above pusher mechanism is
A rack and pinion type may be used instead of a chain drive type. In addition, in the present invention, NC control is used for operations such as feeding the workpiece, determining the width (perpendicularity), advancing the workpiece to the folding line, pressing it against the abutment piece (back gauge), gripping the workpiece, retreating, and rotating the workpiece. This allows flexible production of bending workpieces of different sizes.

[Example] The panel former of the present invention bends the four sides of the work plate material upwardly or downwardly at acute angles or obtuse angles, or continuously bends them in a U-shape or Z-shape, or bends the edges of the workpiece board bent upwardly or downwardly. The machine performs processing automatically, and the entire device consists of a bending machine and a front table device.

The examples in FIGS. 1 to 11 show examples using a coki bender as the bending machine, and FIG. 12 shows an example using a wing bender. First, Figure 1, Figure 2
This will be explained based on the diagram. In the figure, 1 is a bending machine main body, 2 is a clamp mold, 3 is a fixed mold, 4 is an upper bending mold, 5 is a lower bending mold, 7 is a ram, 8 is a bed, 9 is a belt conveyor, and 10 is a frame.

A hydraulic cylinder CY1 for driving the ram is provided at the upper part of the frame 10, and a toggle is connected to the piston rod of the cylinder CY1 to cause the ram 7 to move up and down. The toggle mechanism includes a link 11 suspended from the top of the frame 10 using a pin, a link 12 raised from the ram side using a pin, and a common pin 13 that connects both links.
It consists of a piston rod 14 which is stopped by a piston rod 14. Further, although not shown, the clamp mold 2 is equipped with a mold length changing device.

The upper bending die and the lower bending die are fixed to holders 15 and 16 with back-ups 15a and 16a, respectively, and have arms 18a and 18b connected to each other by connecting plates 17 and pins 22 at the rear, respectively. These arms have the upper bending die and the lower bending die fixed to their rear ends so that each bending die rotates approximately tangentially to the bending line, and one arm 18a is equipped with a hydraulic cylinder for bending.
I am wearing CY2. The front ends of the arms 18a, 18b are supported by eccentric shafts 19a, 19b, gears 20a, 20b are engaged with these, respectively, and one gear 20a is engaged with a rack 21 driven by a cylinder CY2. However, instead of this rack, an NC-controlled motor (not shown) may be installed. Hydraulic cylinder CY2 for small bending is always in the middle position, and when bending upward, piston rod 2
When the piston rod 3 is extended and bent downward, the piston rod 23 is contracted. These operations are performed by the link action of the arm, the connecting plate, and the eccentric shaft. That is, upward and downward bending is realized by one hydraulic cylinder CY2. In addition, when it is necessary to adjust the clearance between the upper and lower bending dies and the clamp dies in anticipation of changes in the plate thickness or overbending of the worksheet 60, the above-mentioned cylinder
Drive CY3, rack 21, gears 20a, 20
The eccentric shafts 19a and 19b are rotated via the shaft 19b. Note that a back gauge 59 is provided at the rear of the vertical bending mold as shown in FIG.
Illustrations are omitted in FIGS. 1 and 2.

Next, the front table device will be explained.

As shown in Figures 1 and 2, the bending machine body 1
A table 26 with a machine stand 25 provided in front of the table 26 for handling the workpiece, and a movable yoke 40 that can move forward and backward with respect to the folding line are installed. table 26
consists of a plurality of roller conveyors 27 arranged at the same level as the belt conveyor 9 on the left and right sides of the front of the main body excluding the center as shown in plan in FIG. Each roller conveyor has a large number of ball casters 29 mounted inside a frame 28 (Fig. 3).
The workpiece 60 is moved and rotated along the perspective line formed by the upper surface of the ball caster row. The table 26 also has a centering mechanism 30 as shown in FIG. This mechanism 30 is connected to the table 26
The workpiece 60 fed to the table is brought to the center of the table and the workpiece is aligned at right angles to the folding line.
It consists of a screw rod drive device 32, an arm 33 screwed onto the screw rod, a movable member 34 attached to the upper end of the arm, and a guide rail 35 for the movable member. During the centering operation, the arm 33 itself is erected by means such as claws or links (not shown) and moved on the table top surface, but as shown by chain lines in FIG. There is no hindrance to the supply and removal of the materials.

A yoke 40 is arranged in a gap at the center of the table 26. This yoke 40 is placed on a rail 41 on the machine base 25, and is connected to a hydraulic cylinder for forward and backward movement.
CY4 allows movement in a direction perpendicular to the folding line (Figure 1). A vertically slidable tip 43 is attached to the tip of the upper arm 42 of the yoke by a cylinder CY5 constituting an elevating mechanism to support a rotatable pad 44. On the other hand, a lower pad 46 is supported at the tip of the lower arm 45 of the yoke at a position opposite to the upper pad 44. A gear or sprocket 47 is provided on the shaft of the lower pad 46 and is connected to a rotary drive 48 attached to the underside of the lower arm (FIG. 1). Above upper and lower pads 44, 46
and the rotation drive device 48 constitute a workpiece rotation unit.

Further, the lower arm 45 of the yoke 40 is provided with a pusher mechanism 50 for feeding the workpiece to the folding line. As shown in FIGS. 1 and 2, this pusher mechanism 50 includes a pair of sprockets 51 and 52 attached near the tip of the lower arm 45 and the rear end of the yoke, and an endless chain 53 extending between both sprockets 51 and 52. , a pusher support 54 fixed to the upper chain, and a spring 55 attached to the pusher support 54.
A pusher member 56 attached through the chain, a chain gripping member 57 fixed to the lower chain, a piston rod 58 attached to the rear end of the chain gripping member 57, and a hydraulic cylinder fixed to the machine base 25.
It has been around since CY6. The pusher member 56 is
When the yoke forward/backward movement cylinder CY4 is driven while the hydraulic cylinder CY6 is extended, the yoke 40
As the yoke moves, the chain 53 rotates relative to the yoke, and as a result, the feed action is performed at an increased speed with respect to the movement of the yoke. Further, when the cylinder CY6 is driven with the yoke 40 stopped, the pusher member moves in the front and rear directions by the stroke thereof.

[Function] The function of the above device will be explained. Workpiece 6 carried onto table 26 by belt conveyor 7
0 is stopped at the center of the bending machine body 1 by the centering mechanism 30. Yoke 40 is a cylinder
Operate CY4 to set the workpiece in advance to a position that allows some leeway for rotation. Then cylinder CY
6, the pusher member 56 is advanced and the pusher member 56 is brought into contact with the pack gauge 59 (Fig. 6) to determine the bending height. Then, the ram drive cylinder CY1 is operated to clamp the workpiece end with the clamp mold 2 and the fixed mold 3. Then, the cylinder CY2 drives the upper bending die 4 or the lower bending die 5 to perform flat bending. In the case of upward bending, the force of the cylinder for bending CY2 is directly transmitted to the upper bending die 4, and in the case of downward bending, it is transmitted to the lower bending die 5 via the connecting plate 17 and the arm 18b. Eccentric shafts 19a, 19b are gears 20a, 20b
It is connected with a cylinder for clearance adjustment.
By operating CY3 and changing the eccentric mounting positions of the arms 18a and 18b, the upper and lower bending dies can be moved slightly back and forth, and as a result, the workpiece can be bent at an acute angle or an obtuse angle. The amount of movement of the rack 21, that is, the amount of eccentricity, is NC controlled. When the width of the workpiece is determined (centered), the workpiece is brought into contact with the back gauge, and the four sides are bent in conjunction with the pullback rotation as described above, it is necessary to set the forward and backward movements to a minimum. When rotating the workpiece 60 by holding the center of the workpiece 60 with the rotary pads 44 and 46 and abutting against it, the shortest tact time is achieved, but this alone does not ensure that the workpiece is accurately parallel to the folding line. Therefore, as shown in FIG. 11, the present invention includes the step of pushing the workpiece with the pusher member 56 to make it parallel to the back gauge 59, and the step of loosening the rotary pad and making it parallel by the elasticity of the spring 55 of the pusher mechanism. I'm here. During this time, the distance l ₂ from the rotational center position B to B' and the distance l ₃ between the rear end position D of the abutted workpiece and the starting position G of the pusher member 56 are always kept at a ratio of 1:2. That is, the workpiece is moved forward, backward, and rotated by operating the rotary pad, and only when it hits the back gauge, a gap is created between the rotary pads 44 and 46, and parallelization is performed using a pusher. As a result, the rotary pad is automatically positioned at the center of the loaded workpiece, allowing accurate dimensioning.

Next, the operation will be described in more detail based on FIG. 6 and subsequent figures. FIG. 6 shows that a workpiece 60 with its long side facing the transfer direction is transferred by the conveyor 9 to approximately the center of the main body 1 and once stopped, and the centering mechanism 3
0 indicates a state in which it is brought to the center and stopped. In this state, cylinder CY6 is at the forward limit,
The pusher member 56 is in the standby position C.

The standby position means a retreated position where the pusher member 56 does not interfere with the work when the work is rotated. For example, as shown in Figure 11, if the maximum size of the workpiece is 1200mm on the long side and 800mm on the shortest side, the diagonal line is approximately 1440mm, so the radius of rotation of the workpiece is
It will be 720mm, but for further safety, 1/2 of the long side
The standby position is a position C with a margin of about 200 mm from the distance m = 600 mm, that is, a position 800 mm away from the center B of the rotating pad. Next, as shown in FIG. 7, the pusher cylinder CY6 is driven to the intermediate position, and the chain gripping member 57 is pulled by a distance equal to the distance m, thereby advancing the pusher member 56 to the position G. At this time, the bending line is A
Then, the distance from the folding line to the rotating unit and the distance from the rotating unit to the pusher are
As shown in FIG. 11, AB=l ₁ =BG.

Next, the cylinder CY4 for forward and backward movement is driven to move the yoke 40 forward. Pusher cylinder CY6
is fixed to the machine base 25, so as the yoke 40 moves, the chain 53 rotates relatively.
The pusher member 56 moves forward as shown. This movement reduces the moving distance of the yoke to l ₂ as shown in Figure 11.
Then, the pusher member moves a distance l ₃ =2×l ₂ . When the pusher member comes into contact with the rear end of the workpiece, the limit switch (not shown) is turned on and the cylinder is closed.
CY5 operates and the rotary pad 44 descends to grab the workpiece. While holding the workpiece, move the forward/backward movement cylinder CY4 backward, advance the pusher cylinder CY6 to return the pusher member 56 to its original position, and then drive the rotary drive device 48 to rotate the workpiece 90 degrees. Orient the short side parallel to the fold line.

Next, the pusher cylinder CY6 is driven to the intermediate position to advance the pusher member 56 to position G, and at the same time, the forward/reverse cylinder CY4 is driven to make the pusher member 56 run at double speed as described above. Move the workpiece to position D in Fig. 11 and press the tip of the workpiece against the pack gauge 59 (9th
figure). At this position, the limit switch turns ON and the rotating unit turns OFF. In this state, the clamp die 2 is lowered to clamp the tip of the workpiece, and the ram 7 is operated to perform upward or downward bending as shown in FIG. 4 or 5. Immediately open the mold, lower the pads 44 and 46 again to grip the workpiece, and return it to the position shown in FIG. At this time, the sprockets 51 and 52 rotate in the opposite direction to the front direction, thereby retracting the pusher member 56 to the G position. After bending one of the short sides in this way, the workpiece 60 is
Rotate 180° and fold the other short side using the same procedure.
Next, rotate the workpiece 90° and bend one long side.
Rotate it another 180 degrees and fold the other long side to complete the entire folding process.

In the above example, Koki bending was described, but wing bender (or folding machine)
It can also be applied to As shown in Fig. 12, the wing bender holds a workpiece 60 with an upper mold 2 attached to the lower part of the ram and a lower mold 3 installed on the bed, and is movable (wing Turn the mold 6 by about 90 degrees as shown by the arrow to bend the edge of the workpiece. The movable mold 4 is a cylinder supported by shafts at both ends of the bed and attached to a beam 6a.
It is rotated by the piston rod extension of CY7.
When bending a workpiece, the same front table as in the previous embodiment feeds the workpiece, determines the rotary bending height, and performs four-sided bending.

[Effects of the Invention] As described above, the present invention has a yoke that can move forward and backward at the center of the front table, a work that rotates while gripping the center of the work is provided at the tip of the yoke, and a Since it is equipped with a pusher mechanism for feeding the workpiece, it is possible to automate the four-side bending process by feeding the workpiece, rotating it, etc. In particular, the pusher member for feeding the workpiece is
It is attached to a chain running on the lower arm side of the yoke and feeds out relative to the movement of the yoke, so the workpiece can be dimensioned quickly and accurately.
Further, when the workpiece is rotated, it is retreated to a position where it does not interfere with the workpiece, so that the workpiece can be handled smoothly on the table.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the panel former of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 shows the mutual relationship of each type during upward bending. FIG. 5 is an enlarged sectional view when bending downward, FIGS. 6 to 10 are side views showing the operating state of the front table device, and FIG. 11 is a plane showing the positional relationship between the rotation of the workpiece and the pusher. Figure, 12th
The figure is a side view when a wing bender is used as a folding machine, FIG. 13 is a perspective view of a completed folded product, and FIG. 14 is a perspective view of a worksheet. 1...Bending machine body, 2...Clamp type, 3...
...Fixed type, 4...Upper bending type, 5...Lower bending type, 6
...Movable, 7...Ram, 8...Bed, 9...
Belt conveyor, 26... table, 29... ball caster, 40... yoke, 42... upper arm, 44, 46... pad, 50... pusher mechanism, 51, 52... sprocket, 53... chain , 56... pusher member, 57... chain gripping member.

Claims (1)

[Claims] 1. After the workpiece supplied to the front table of the folding machine is moved to the center of the machine by the centering mechanism, the workpiece is moved forward and backward along the folding line while grasping the center of the workpiece, and the workpiece is rotated by the rotating unit. In this device, a yoke is attached to the center of the front table so that it can move forward and backward in a direction perpendicular to the folding line, and a yoke is installed at the tip of the yoke to grip the center of the workpiece and rotate the workpiece. and a pusher mechanism for feeding the workpiece attached to the side of the rotating unit to move the workpiece forward and backward relative to the movement of the yoke, and the pusher mechanism is located near the tip of the lower arm of the yoke. and a pair of sprockets attached to the rear end of the yoke, an endless chain attached to both sprockets, a pusher member fixed to the upper chain, a chain gripping member fixed to the lower chain, and a cylinder attached to the rear end of the chain gripping member. A panel former that is characterized by: 2 The bending machine consists of a clamp type, a fixed type, a pair of arms that rotate toward and away from the folding line almost tangentially, an upper bending type fixed to the tip of one arm, and the other arm. It consists of a downward bending die fixed to the tip, a connecting plate that connects both arms, and a common hydraulic cylinder, and by rotating the arm, upward bending,
The panel former according to claim 1, which is a flat bender that performs a downward bending process. 3 The bending machine is a patented wing bender that consists of a clamp type, a fixed type, and a movable type, and performs the bending process by rotating the movable type around the clamp tip of the clamp type and fixed type. A panel former according to claim 1. 4. The panel former according to claim 1, wherein the front table is composed of rows of ball casters arranged on the left and right sides, excluding the space near the front center of the folding machine where the yoke advances. . 5. The rotating unit includes a lifting mechanism provided at the tip of the upper arm of the yoke, an upper pad rotatably attached to the tip of the lifting mechanism, and a lower pad attached to the tip of the lower arm of the yoke at a position facing the upper pad. , and a rotational drive device provided on the side of the lower pad.