JPH038628A - Method and device for supplying plate material to plate machining device - Google Patents

Abstract

PURPOSE:To process two plate materials put on each other at once and reduce the number of work processes by holding the two plate materials combined with each other on a two plates combining table by a loader clamp, and supplying them onto a work table while positioning them. CONSTITUTION:Plate materials mounted on a parallel 1 are transferred by a pallet conveyor 17 to a pallet supporting device 15 in front. The plate materials on the pallet 1 of the pallet supporting device 15 are sucked by a suction pad of a transferrer 3 one by one from the uppermost layer to be transferred in the direction of a Y-axis and put on top of a two plates combining table 5 next to it. Two plate materials on top of the table are combined with each other, and the positioned plate materials are held at their rear end part by a loader clamp 7 to be transferred to a work table 9 of a turret punch press 19 in front. The transferred plate materials are held by a work clamp 127 on the work table 9 under control to be pressed automatically.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a sheet material feeding method for a sheet metal processing machine and its device. This is a method in which two sheets of sheet metal are superimposed and conveyed and supplied while being positioned on the upper surface of a work table to undergo predetermined sheet metal processing.

(Prior art) In sheet metal processing machines such as turret punch presses, sheets are fed one by one onto the top surface of a work table to perform press processing. The configuration is such that it is performed for each sheet.

(Problems to be Solved by the Invention) In such conveying and processing of each plate to the upper surface of the work table, there is a limit to processing efficiency, and it is difficult to increase productivity.

Therefore, it is an object of the present invention to convey the plate material to the work table and process the plate material in a two-layered manner, thereby performing highly efficient and accurate processing.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, the conveying device 3 picks up the plate materials W to be stacked on the top surface of the pallet 1 one by one and conveys them onto the two-sheet stacking table 5. A sheet metal feeding method for a sheet metal processing machine in which two sheets of sheet material W are overlapped while being positioned, and the two sheets of sheet material W that have been overlaid on the two-layered table 5 are held by a loader clamp and supplied while being positioned on a work table 9. It is.

The present invention also provides a conveying means 3 for sucking and conveying plate materials W one by one, a two-sheet stacking table 5 for receiving and positioning each plate material W conveyed by the conveying means 3, and superposing the two-sheet materials W, and this two-sheet stacking table 5. A plate material feeding device for a sheet metal processing machine was constructed by comprising a loader clamp that clamps and feeds two superimposed plate materials W in a superposed state while positioning them on a work table 9.

(Function) The plate materials W are stacked on the upper surface of the pallet 1, and the conveying device 3 picks up the loaded plate materials W on the pallet 1 one by one from above and conveys them onto the two-sheet stacking table 5.

Among these, the -th plate material W is conveyed to the upper surface of the two-ply table 5 and positioned at a fixed position. Further, the double plate material W is also conveyed and positioned in the same manner, and is superimposed on the upper surface of the -th plate material W on the double stacking table 5.

The two sheets W superimposed on the upper surface of the double-layered table 5 are clamped by the loader clamp 7, and then fed while being positioned on the upper surface of the work table 9 for the next process. While being clamped from the loader clamp 7 to the machining clamp on the work table 9, it is subjected to predetermined processing.

While the plate materials W supplied in a superposed state on the upper surface of the work table 9 are being processed, when conveying the subsequent plate materials W, the conveyor device 3 stacks two sheets of the plate materials W on the pallet 1 onto the table 5. The plate material W is transferred to the upper surface in the same manner as above, stacked in two sheets, and after the processing on the upper surface of the work table 9 in the previous process is completed, the plate material W is placed on this work table 9.
supply.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIGS. 1 and 2, a pallet support device 15 for supporting a pallet 1 on which plate materials W are stacked is provided on the bottom side of a cubic machine frame 11, and this pallet support device is provided on the other side. A two-ply table 5 is provided to superimpose and support the plate materials W conveyed from 15, and these left and right pallet support devices 1
A conveying device 3 is provided which reciprocates over the upper direction of the double sheet stacking table 5 and the double sheet stacking table 5. A pallet conveyor 17 is provided outside the machine frame 11 and behind the pallet support device 15 (on the right side in FIG. 2), and a pallet conveyor 17 is provided to transport the plate materials W from a storage device that loads and stores the plate materials W onto the pallet 1. conveyor 1
7 to supply the pallet support device 15. Further, in front of the two-sheet stacking table 5 (on the left side in FIG. 1), there is provided an automatic turret punch press 19 for receiving and punching the two-ply plate material W supplied from the two-sheet stacking table 5.

Among these, the pallet support device 15 is provided with a conveyor roll 21 that supports and guides the pallet 1 sent from the pallet conveyor 17, and a lift cylinder 23 that lifts and lowers the pallet 1 on the conveyor roll 21. As the loaded plate materials W are conveyed one by one by the conveyance device 3, the pallet 1 is automatically raised to a certain height position so that the conveyance device 3 can easily take out the plate materials W. It consists of

Further, this pallet support device 15 is provided with a stopper S for positioning the pallet 1 supplied from the pallet conveyor 17 at a fixed position, and also detects the thickness of the plate material W and separates the plate material W by the conveyance device 3. a sheet number sensor 25 that determines the number of sheets to be ejected; a sheet material separation device 27 that uses magnetic force to separate the negative corner edges of the overlapping sheet materials W when they are separated by the conveyance device 3 and levitates the upper surface of the sheet materials W; Workpiece sagging sensors 29 and the like are provided on the machine frame 11 to detect sagging of the edges of the plate material W at the other three corners.

The two-ply table 5 is installed on the side of the pallet support device 15, has free balls 31 arranged at predetermined intervals on the upper surface, supports the plate material W on the upper surface, and is configured to be movable. A work table 9 of a turret punch press is provided on the front side of V in the front-rear direction (hereinafter referred to as the X-axis direction) on the same plane as V. Near the upper surface of this two-layer table 5, a loader clamp 7 that clamps the rear end edge of the plate material W supplied to the upper surface of this table 5 from the upper and lower surfaces and moves in the X-wheel direction along the upper surface of this table 5.
will be established. Further, from the pallet supporting device 15 to the conveying device 3
In order to position the plate material W transported by A fixed pad 37 that sucks and fixes the bottom surface of the first plate W that has been removed, and a Y-axis feed bin 39 that sucks the bottom surface of the -th plate W and moves in the Y-axis direction. A Y transport pusher 41 for pushing and pulling along the elongated hole in the Y-axis direction of 5 is provided.

The conveyance device 3 uses a large number of suction pads 43 to hold the plate material W.
The upper surface is suctioned by vacuum force, lifted and separated from the lower plate material W, transported, and this suction is released to allow it to fall. This suction bat 43 may be replaced by an electromagnetic mechanism. The upper rail of the machine frame 11 supports and guides a transport frame 49 that is movable in the Y-axis direction by a motor driven by a wire, chain 47, etc., and is provided so that the transport frame 49 can be raised and lowered by a vertical cylinder 51. .

The support 53 having the suction bat 43 is guided by a small movement in the Y-axis direction by a Y-axis near motor guide 55, and further guided in the X-axis direction by a Y-axis near motor guide 55.
The elevating frame 5 is slightly guided in the X-axis direction by a wheel near motor guide 57, and this X-axis near motor guide 57 is attached.
9 is vertically guided by the vertical guide member 143,
It is raised and lowered by the expansion and contraction of the vertical cylinder 51. Further, the X-axis near motor guide 57 is finely controlled in the X-axis direction by the X-wheel cylinder 61, and the Y-axis near motor guide 57 is controlled to move slightly in the X-axis direction.
Reference numeral 5 denotes a configuration in which fine movements are controlled in the Y-axis direction by a Y-axis cylinder 63, and the suction bat 43 is controlled to move freely in three-dimensional directions.

Further, a vibrator 45 made of an air vibration cylinder is provided at a position where the suction bat 43 suctions the end portion of the plate material W on the loader clamp 7 side.
vertical vibration is applied to the conveying device 3 to move the pallet
When adsorbing the upper plate material W, the lower plate material W is better separated to eliminate the possibility of it being brought up. This vibrator 45 vibrates the plate W when the sheet number sensor 25 detects that two sheets are taken.

The loader clamp 7 is attached to a clamp frame 65 along the X-axis direction, and is composed of a movable clamp 67 on the side closer to the Y-axis locate pin 33 and a fixed clamp 69 on the far side. As shown in FIGS. 3 and 4, the clamp frame 65 is connected to the loader frame 71 by fitting and guiding the left and right sides of the loader frame 71 onto vertical guide shafts 73. The vertical movement is controlled by a vertical cylinder 75 provided between the frame 65 and the free ball 31 on the top surface of the two-layer table 5.
The gap e (see FIG. 10) between the upper end and the lower surface of the finger upper piece 77 on the lower side of the clamp 67, 69 is set to a predetermined height.

Each of the movable clamps 67 and the fixed clamps 69 has a finger piece 77 that intervenes in the gap between the two-layer table 5 and the plate material W supplied to the upper surface of the plate material W, and scoops the bottom surface of the plate material W.
and a clamping piece 79 that presses and clamps the plate material W on the finger top piece 77 from above, and each clamping piece 79 is configured to control vertical movement around a clamping shaft 83 of a clamp body 81, Holding and releasing.

The movable clamp 67 is provided so as to be freely rotatable around a vertical pivot shaft 85 with respect to the clamp frame 65 on the side near the Y-axis locate pin 33 on the two-sheet table 5 and the work table 9.

More specifically, as shown in FIGS. 5 and 6, a Y-axis slider 89 is provided on the clamp frame 65 and guided to move in the Y-axis direction by a Y-axis near motor guide 87. A clamp attachment body 91 integral with the Y-axis slider 89 is rotatably provided with a pivot shaft 85 integrally having a rotating body 93 at its lower end. The movable clamp 67 is provided with respect to the rotating body 93 and is guided to move in the X-axis direction via an X-axis near motor guide 95. This x
Clamp bodies 81 of the pair of movable clamps 67 are attached to both left and right sides of a mounting arm 97 that is integral with the shaft near motor guide 95. The pair of left and right movable clamps 67 are provided symmetrically with respect to the pivot shaft 85.

At the upper end of the pivot shaft 85, there is a rear (left side in FIG. 6)
Similarly, a plate 101 is provided at the upper end of the clamp mounting body 91 so that they overlap vertically, and a roller 103 is rotatably mounted at the tip of the arm 99. A fixed cylinder 105 is attached to the plate 101 as shown in FIGS. 7 and 8. Cylinder piston 107 of this fixed cylinder 105
The tip of the movable clamp 67 can be fixed to the clamp frame 65 by contacting the roller 103 of the arm 99 and pressing the roller 103 against a stopper 109 attached to the clamp frame 65. can. The shaft pin 111 of the roller 103 protrudes downward from the arm 99 as shown in FIG.
It is inserted into the hole 113 formed in 01.

Attach the fixed cylinder 115 to the clamp frame 65,
The tip of the cylinder piston 117 of this fixed cylinder 115 is connected to a floating joint 119 of the clamp attachment body 91.

When both fixed cylinders 105 and 115 are released, the movable clamp 67 attached to the rotating body 93 can rotate within the hole 113 of the plate 101. A pulling cylinder 121 is provided on the rear side of the clamp mounting arm 97 (on the left side in FIGS. 5 and 6).
is provided, and the cylinder piston 1 of this pulling cylinder 121 is
23 is attached to the revolving body 93. This allows the movable clamp 67 to be guided by the near motor guide 95 along the X axis.
It is configured to move in the axial direction.

Referring again to FIG. 1, on the work table 9 of the turret punch press 19 are a carriage base 125 whose movement is controlled in the X-axis direction, a machining ecrumb 127 whose movement is controlled in the Y-axis direction, and a Y-transport pusher. 129 is provided, and the two-ply plate material W sent in the X-axis direction from the two-ply table 5 by the loader clamp 7 is placed on standby on the same side of the two-ply table 5 as the Y-axis locate pin 33 by the Y transport pusher 129. Eclambu 12
7 in the Y-axis direction. Further, an X-axis locating pin 131 is provided at the rear end of the work table 9 and projects from the bottom, and after the plate material W is transferred and supplied onto the work table 9, the X-axis locate pin 131 is provided to determine the origin position in the X-axis direction. be.

As shown in FIG. 2, reference numeral 133 is a chino for transporting the loader clamp 7 in the X-axis direction, and a double-ply table 5.
The left and right ends of a loader frame 71 having a loader clamp 7 are connected to this chain 133 between the front and rear sprockets 135 along both left and right sides of the loader frame 71, and the loader clamp 7 is It is configured to reciprocate in the X-axis direction on the double-sheet table 5. As shown in FIGS. 3 and 4, 137 is a cheno guide that guides the chino 133, and 163 is a slider at both ends of the loader frame 71, which is guided by the rail 165 in the X-axis direction on the machine frame 11. .

139 is a sprocket shaft. As shown in FIG. 1, 141 is a near blower, and the pallet support device 15
The suction pad 4 of the vibrator 45 is provided at the rear end.
By blowing air into the gap created between the rear edge of the plate W floated by the suction vat 43 and the lower plate W, the plate W sucked up by the suction bat 43 is separated from the lower plate W. This is to ensure that the process is carried out smoothly.

Next, the operation of the above configuration will be explained.

The plate materials W loaded on the pallet 1 are transferred by the pallet conveyor 17 onto the pallet support device 15 in front. The plate materials W on the pallet 1 of the pallet support device 15 are suctioned one by one from the upper layer by the suction batt 43 of the conveyance device 3, conveyed in the Y-axis direction, and placed on the upper surface of the adjacent double-ply table 5. When the two plates W on the upper surface of the two-ply table 5 are superposed, the loader clamp 7 clamps the rear end edge of the positioned plate W and transfers it to the work table 9 of the turret punch press 19 in front.

The transferred plate material W is held on the work table 9 by the machining clamp 127 and is automatically pressed while controlling the transfer.

Each automatic control process operation of the conveyance device 3 and the loader clamp 7 will be explained.

(1) Lowering the suction pad 43: The conveyance frame 49 is moved above the pallet support device 15 by the chino 47 and stopped, and the suction pad 43 suspended by the elevating frame 59, support 53, etc. is lowered by the vertical cylinder 51. Then, each suction bat 43 is suctioned onto the upper surface of the plate material W on the pallet 13.

(2) Suction of the suction batts 43: By applying a vacuum to each suction bat 43 suctioned to the upper surface of the plate material W, the topmost plate material W to be stacked is suctioned.

(3) Rise of pie break 45: vibrator 45
The suction bat 43 lifts the rear end of the plate material W by suction, leaving a gap between the plate material W and the lower layer of the plate material W. At this time, air is blown by the near blower 141.

(4) Operation of the sheet number sensor 25: The sheet number sensor 25 approaches the rear end of the plate material W, detects whether or not two sheets are taken, and retreats when this detection is completed. When the sheet number sensor 25 detects a state in which two sheets are taken, the vibrator 45 is activated to vibrate the plate material W to prevent the lower plate material W from adhering to the lower surface of the suction plate material W and climbing up.

(5) Raising the suction bat 43: When the suction bat 43 suctions the plate material W, it is raised by the upper and lower cylinders 51.

(6) Y-axis movement of the suction bat 43: The suction bat 43, which has suctioned the plate material W and has risen to a predetermined position, is moved to the upper surface of the two-sheet table 5 in the Y-axis direction by the conveyance frame 49 formed by the chino 47.

(7) Lowering of the suction bat 43: With the suction bat 43 suctioning the plate material W by the vertical cylinder 51 above the two-ply table 5, the suction bat 43 is lowered to an appropriate intermediate position (for example, a height of 10 mm above the surface of the two-ply table 5). Been,
- Stop for a while.

(8) Origin setting: Plate material W on double-ply table 5
Positioning is performed in the Y-axis direction by the Y-axis locate pin 33, and in the X-axis direction by the X-axis locate pin 35.
Positioning in the axial direction is performed and the origin position is determined. Each of these locating pins 33, 35 protrudes from the lower surface to the upper surface of the two-layer table 5 at an appropriate height at a predetermined position.

In FIG. 3, A is the abutment line where the Y-axis end edge of the plate material W abuts on the upper surface of the work table 9, and B is the abutment line for the plate material W.
Shows the loading line.

(9) Origin positioning: When the suction vat 43 is lowered to a predetermined position, the X-axis cylinder 61 and the Y-axis cylinder 6
3 slightly moves the support 53 of the suction bat 43 in the direction of the X-axis locate pin 35 and the Y-axis locate pin 33 by the movement guidance of the X-axis near motor guide 57 and the Y-axis near motor guide 55. The rear end edge of the rear lateral corner of the plate W being sucked by the suction bat 43 comes into contact with the X-axis locating pin 35, the Y-axis edge comes into contact with the Y-axis locating pin 33, and the bottom surface of the plate W is brought into contact with the Y-axis locating pin 33. is placed on the two-layer table 5, and the origin position on the two-layer table 5 is determined.

(10) Lowering the suction bat 43: The suction bat 43, which had been stopped at a predetermined height position on the two-sheet table 5, descends and places the plate material W on the two-sheet table 5.

At this time, the bottom surface of the plate material W is supported by the free ball 31 on the top surface of the table 5.

(11) Lifting and adsorption of the fixing pad 37: - The fixing pad 37 is raised from the lower side of the stacking table 5 to the upper surface, and adsorbs the lower surface of the plate material W to fix it in a fixed position.

(12) Y-axis path of the Y-transporting butcher 41: The plate material Wl, which has been lowered near the upper surface of the two-layer table 5 by the suction pad 43 in this way, is supported on the two-layer table 5 and fixed by the fixing pad 37. The plate material W being held is also pushed by the Y-transport pusher 41 and abuts against the Y-axis locating pin 33.

(13) Releasing and raising the suction pad 43: The fixing pad 37 suctions the lower surface of the plate W to maintain fixation, but the suction pad 43 releases the suction of the plate W and is raised by the upper and lower cylinders 51.

(14) Movement of the suction pad 43, double sheet conveyance: The suction pad 43 moves to the pallet support device 15, conveys the double sheet material W in the same process as above, and places it on the double sheet stacking table 5. Lay it on top of the first board W.

(15) Advancement of the loader clamp 7 2 The loader clamp 7, which was waiting at the rear end of the two-layer table 5, moves the plate material W
The scooping piece 77 is inserted into the gap between the lower surface of the lower plate material W and the upper surface of the two-ply table 5.

(16) Closing loader clamp 7: Loader clamp 7
The respective clamping pieces 7° 9 are moved downward, and the rear end edges of the two overlapping plates W are clamped between them and the lower scooping piece 77.

At this time, the fixed clamp 69 is not clamped, only the movable clamp 67 is clamped, and the movable clamp 67 is moved rearward to draw the plate material W rearward and press it against the X-axis and Y-axis locate pins 35 and 33. The origin position may be accurately determined. This movement of the movable clamp 67 involves releasing the fixation of the fixed cylinders 105 and 115, making the roller 85 and the arm 99 movable, and thus making the movable clamp 67 freely pivotable around the pivot shaft 85. After W is clamped, it is pulled rearward by the pulling cylinder 121. After locating the origin, the fixed clamp 6
Have the students perform the clamping technique shown in step 9.

(17) Lifting of the suction pad 43 2 When the loader clamp 7 clamps the plate material °W positioned at the origin, the suction of the suction pad 43 is released and the pallet support device 15 is raised.
The next plate material W above is conveyed.

(18) Movement of loader clamp 7: Between two sheets
The clamped plate material W is transferred and supplied to the upper surface of the work table 9 in front while being clamped by the loader frame 71 that is moved forward by the motor M1 chain 133 and the loader clamp 7 of the clamp frame 65.

(19) Setting the origin on the work table 9 When the plate material W is supplied from the 22-sheet stacking table 5 onto the work table 9, the X-axis locate pin 131
It protrudes onto the rear end surface of.

In addition, the Y transportation pusher 129 processes the plate material W with the clamp 12.
Go along the Y-axis to the 7 side. In this way, on the work table 9, the origin position of the plate material W is set by the X-axis locating pin 131 and the processing clamp 127.

(20) Releasing the clamping of the fixed clamp 69: The loader clamp 7 supplies the plate material W onto the work table 9, and the movable clamp 67 can freely rotate around the rotation axis 85 while clamping the plate material W, and fix it. Release the clamp 69.

(21) Y-axis path of Y transport pusher 129: Y transport pusher 129 on work table 9 moves plate material W to Y
Push in the axial direction to abut line A of the machining clamp 127
hit it against. At this time, the movable clamp 67 of the loader clamp 7 with both fixed cylinders 105 and 115 released from fixation is holding the plate W, so the Y-axis near motor guide 87
is guided by and moved in the Y-axis direction. In addition, since the movable clamp 67 is rotatable around the pivot shaft 85, even if the lateral edge of the plate material W is not parallel to the abutment surface (abutment line) A of the processing clamp 127, the Y transport button By pressing at 129, they are collided in parallel and the Y-axis origin position is accurately determined.

(22) Bow pulling cylinder 121 = When the pulling cylinder 121 is operated with the Y transport pusher 129 pushing the plate W, the movable Kuraray Pro lower pulls the plate W backward and moves it to the X-axis locating pin 131. bring it into contact. This determines the X-axis origin position.

(23) Closing of the processing clamp 127: Once the origin position of the plate material W is determined in this way, the processing clamp 127 clamps the two-layered plate material W, and while controlling the movement on the work table 9, the turret punch brace 19 Perform processing.

(24) Opening of the loader clamp 7: When the plate material W is clamped by the processing clamp 127, the clamping of the movable clamp 67 is released.

(25) Retreating the loader clamp 7: The loader clamp 7 returns to the rear end position of the two-sheet table 5 and waits for clamping the next plate W.

Next, other examples of this example are shown in FIGS. 11 and 12.
With regard to the figures, points different from the above embodiment will be explained. While the conveyance device 3 is moved up and down on the upper side by a vertical cylinder 51 and guided by a vertical guide member 143, a link mechanism 145 that can be expanded and contracted vertically is used.
It is configured to expand and contract using upper and lower cylinders 51.

Also, the X axis.

A lifting frame 1 in which a rotating frame 147 to which a Y-wheel linear motor guide 57.55 is attached is provided at the lower end of the link mechanism 145.
49, it is provided so as to be pivotable around a pivot shaft 151.

The pallet support device 15 is also provided with a lifter 155 that is raised and lowered by a link mechanism 153, and a chain bearer 157 that takes out the remaining empty pallet 1 from which the plate material W has been taken out. Further, a chain conveyor 159 is installed below the two-sheet stacking table 5 to receive the empty pallet 1 taken out from the chain conveyor 157 and place it on the carry-out roller 161.

〔Effect of the invention〕

Since the present invention provides the method and apparatus as described above, the conveying device 3 on the upper surface of the two-sheet table 5
The process of stacking the two plates W on the top surface of the work table 9, and the process of changing the positioning from the clamping of the loader clamp 7 on the upper surface of the work table 9 to the processing clamp are performed sequentially.
Since the upper surface of the double-sheet stacking table 5 can be double-layered while the plate material W is being processed, the number of each operation process can be reduced by processing the two sheets W in a polymerized state at once. This enables highly efficient machining.

In addition, these two overlapping plates W are positioned on the upper surface of the two-layer table 5 and the upper surface of the work table 9, respectively, and when clamped by the clamping device 7 on the two-layer table 9, the upper and lower two plates W are Since both of the plates W are directly clamped and contacted by the clamping device 7, there is little misalignment between the two stacked plates W, and highly accurate positioning and processing can be performed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view of a sheet material feeding device in this sheet metal processing machine, Fig. 2 is a side view in Fig. 1, and Fig. 3 is a view taken from arrow m in Fig. 1. FIG. 4 is an enlarged plan view of the center portion of the V in FIG. 3, FIG. 5 is an enlarged plan view of the V center portion in FIG. The figure is an enlarged plan view of the part shown by the ■ arrow in Fig. 3, Fig. 8 is a front view in Fig. 7, Fig. 9 is a rear view in Fig. 7, and Fig. 10 is a side sectional view showing the action of the work clamp. , FIG. 11 is a side view showing another embodiment in place of FIG. 2, and FIG. 12 is a front view of FIG. 11. 1...Pallet 3...Transport device 5...Two-ply table 7...Loader clamp 9...Work table

Claims (2)

[Claims] (1) A conveyance device picks up the planks to be stacked on the top of the pallet one by one and transports them onto a two-ply table.On the top of the two-ply table, each of the transported planks is positioned and superimposed into two sheets, and then placed on the two-ply table. A sheet metal feeding method for a sheet metal processing machine, characterized in that two sheets of sheet metal superposed on each other are held by a loader clamp and fed while being positioned on a work table. (2) A conveying device that picks up and conveys each plate one by one; a two-layer table that receives and positions each plate material conveyed by the conveyor device, and superposes the two plates while positioning the two-layer table; and two stacked plates on the two-layer table. A plate material feeding device for a sheet metal processing machine, comprising: a loader clamp that clamps and feeds the material in a superposed state while positioning it on a work table.