JPH0448700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stacking method for taking out stacked blanks one by one, and can be used, for example, to take out blanks supplied to a press machine.

[Conventional technology]

The press machine is equipped with a stack feeder for feeding the blanks stacked in the magazine to the press machine.In this stack feeder, the blanks are taken out from the magazine as follows. Supplied to the press machine.

The magazine with stacked blanks is placed between the lower lift cylinder and the upper hold device that make up the lift device, and the blanks are pushed up by the lift plate that moves up and down of the lift cylinder, and the blanks are pushed up and down by the hold device. A freely movable latch claw rotates upward with the pushed up blank, and among the many blanks, the blank that reaches above the latch claw is attached to a suction member that is movably provided above the holding device. The blanks are taken out one by one by a suction cup, and after this lowers the height of the uppermost blank to a predetermined height higher than the latch claw, the lift plate is raised to push the blank up. Then, the blank is taken out again by the suction cup, and this process of pushing up the blank by raising the lift plate and taking out the blank by the suction cup is repeated until the lift plate reaches a predetermined height position lower than the height of the latch pawl. The lift plate rises all at once to a predetermined height position (upper limit) higher than the latch pawl, causing all remaining blanks to reach above the latch pawl, and as the lift plate descends, these blanks return to the rotated latch. They are locked with horizontal locking surfaces of the pawls, and these blanks are removed by means of suction cups.

However, in this prior art, when the blank is a relatively large area and thin thin plate, etc., when the lift plate of the lift cylinder reaches the upper limit and then is lowered to the lower limit, the hold occurs as shown in FIG. 9, for example. When the remainder of the blank 3 supported by the latch pawl 2 in the device 1 is running low, the blank 3 is pushed downward by the descending force of the data stack cylinder 5 equipped with the suction cup 4, and finally the latch pawl 2 There is a risk of it coming off and falling.

Therefore, at present, as shown in FIG. 10, the upper limit stop position of the lift plate 6 connected to the lift cylinder is determined by the amount of rotation _h1 of the latch pawl 2 and the amount of hanging from the top surface of the lift plate 6 to the end surface of the blank 3. Taking into consideration h ₂ , the lift plate ₆ is set at a position y 2 higher by h ₃ than the hold position y ₁ (latching position of the latch pawl 2), and the lift plate 6 is kept stopped at this upper limit position y ₂ .

[Problem to be solved by the invention]

However, even in this case, since the end of the blank 3 hangs down from the upper surface of the lift plate 6, there is a problem that the suction cup 4 corresponding to the hanging part cannot stably suction the blank 3.

[Object of the Invention] The object of the present invention is to solve these conventional problems, and to provide a method for safely and reliably taking out stacked blanks down to the last one. The object of the present invention is to provide a method for stacking blank data.

[Means to solve the problem]

Therefore, in the present invention, a magazine in which blanks are stacked is disposed between a lower lifting device equipped with a lift plate that moves up and down and an upper holding device equipped with a latch claw that can freely rotate up and down, and The blank is pushed up by the lifting of the lift plate, and the latch claw is rotated upward by the blank, and among the blanks, the blank that reaches above the latch claw is provided above the holding device so as to be vertically movable. After the uppermost blank is lowered to a predetermined height higher than the latch claw, the lift plate is raised to push up the blank, and then The blank is taken out again by the suction member, and the lifting plate is raised to push up the blank and the suction member is taken out by the suction member, until the lift plate reaches a predetermined height position lower than the level of the latch claw. In the blank die stacking method, the lift plate is raised all at once to a predetermined height position higher than the latch claw, after the lift plate is raised to the predetermined height position higher than the latch claw, The lift plate is lowered to the same height as the horizontal locking surface of the latch pawl that has been rotated back, so that the blank is supported by the lift plate and the horizontal locking surface of the latch pawl, and then the The blanks are taken out one by one by a suction member, and after all the blanks are taken out, the lift plate is lowered.

[Effect]

In the present invention, when the blanks are taken out one by one by the suction member that moves up and down after the lift plate rises all at once to the predetermined height position higher than the latch pawl, the blanks are removed from the horizontal engagement between the lift plate and the latch pawl. Since the blank is supported by the stop surface, the entire blank is in a horizontal state, and since the suction member suctions to the blank in this state, this suction is reliably performed as specified.

[Embodiment] FIG. 1 shows a disk stack feeder for carrying out a disk stack method according to this embodiment. In the figure, above the magazine 11 stacked with a large number of blanks 12, there are
A holding device 21 separates the blanks 12 that are successively pushed up from inside the magazine 11 and holds them in a horizontal position using magnetic force, and the blanks 12 held in this holding device 21 are sequentially attracted from the top. For example, a transfer device 31 that connects the feed device and supplies it to a press machine or the like is sequentially provided, and below the magazine 11 is a device that sequentially pushes the blanks 12 stacked in the magazine 11 upward. Raise the holding device 21
A lifting device 41 is provided for holding it inward.

The magazine 11 has a head insertion hole 13 in the center.
It is composed of a bottom plate 14 having a shape formed thereon, and a plurality of guide posts 15 protruding from the upper surface of the bottom plate 14.
It is designed to be carried to a fixed location in a piled state.

The holding device 21 includes an annular base plate 22 that is horizontally fixed above the magazine 11 via a column (not shown), and is attached to the base plate 22 at a predetermined angular position, for example, at a 90 degree angle position, via a bracket 23. It consists of four guides 24, and a latch pawl 26 attached to the lower part of each guide 24 via a pin 25 so as to be rotatable in the vertical direction. Each guide 24
The base plate 22 is provided with a magnet 27 for separating the plurality of blanks 12 latched by the latch pawl 26 from each other by magnetic force.
It is installed so that its position can be adjusted freely towards the center of the
Further, the latch pawl 26 includes a horizontal locking surface 26A that protrudes from the inner surface of the guide 24. Normally, the horizontal locking surface 26A protrudes inward from the inner surface of the guide 24 due to the spring 28 and is held against the inner surface of the guide 24. It is urged to rotate at a substantially right angle, and its horizontal locking surface 26A can only rotate upward from a state where it is locked in a horizontal position. As a result, when the blanks 12 accumulated in the magazine 11 are pushed up into the holding device 21 by the lift device 41, the latch pawl 26 is rotated by the pushed up blanks 12, and the When the device 41 is lowered, it is returned to its original state by the spring 28 and its horizontal locking surface 26A holds the end of the blank 12 inserted into the holding device 21.

The transfer device 31 has a plurality of disk stack cylinders 33 attached to a transfer plate 32 provided above the holding device 21 so as to be movable in the horizontal direction. A cup attachment arm 34 is attached to the piston rod of each disk cylinder 33, and a suction cup 36 connected to, for example, a vacuum pump or the like is attached to the lower end of the cup attachment arm 34 via a cup attachment member 35. . As a result, each data stack cylinder 33
The piston rod is lowered by driving, and the uppermost blank 12 held in the holding device 21 is sucked by the suction cup 36 at the lower end, and then the piston rod is raised, and then the transfer plate 3
By horizontally moving the blanks 12, the blanks 12 held in the holding device 21 can be sequentially fed to a press machine or the like via a feeding device. Also,
A bracket 37 is attached to the central cup mounting arm 34.
A rod 39 with a dot 38 at its upper end is attached via the transfer plate 32, while a
When the suction cup 36 reaches a certain height from the holding surface of the holding device 21 (latching position of the latch pawl 26), that is, when it becomes below a certain height of the upper surface of the blank 12 in the holding device 21, the dot 39 A limit switch 40 is provided which is turned on by. This limit switch 4
0 is turned on, a certain amount of pressure oil is supplied to the lift cylinder 43, and as a result, the lift plate 4
6 raises the upper surface of the blank 12 by a certain amount. Therefore, by repeating this process, the height of the top surface of the blank 12 within the holding device 21 is maintained within a certain range.

As shown in FIG. 2, the lift device 41 has an upper end of a lift cylinder 43 fixed to a frame 42 below the bottom plate 14. A lift head 45 is screwed onto the tip of the piston rod 44 of the lift cylinder 43. The lift head 45 has a head insertion hole 13 in the bottom plate 14 at its upper end.
A lift plate 46 is provided that enters the magazine 11 through the interior thereof, and the upper end of a rod 47 extending parallel to the axis of the lift cylinder 43 is fixed to one side of the lower part. Rod 47
A dot 48 having a length L is formed at the lower end of the dot 48 . The frame 42 also includes a bracket 4.
Three limit switches 50, 51, 52 which are turned on and off by the dot 48 are provided through the bracket 5, respectively.
3 by said lift head 45,
Two limit switches 54 and 55 are provided, respectively, which are turned off.

These limit switches 50, 51, 52,
Signals from 54 and 55 are applied to a hydraulic control circuit 61, as shown in FIG. The hydraulic control circuit 61 includes the limit switches 50, 51, 5.
The drive of the lift cylinder 43 is controlled via a cylinder drive circuit 62 based on signals from the lift cylinders 2, 54, and 55.

Here, as shown in FIG. 4, the lower and upper limit positions of the lift plate 46 are respectively Y ₀ , Y ₂ ,
Hold position of hold device 21 (latch claw 26
The position of the horizontal locking surface 26A) is Y ₂ , and the position where the lift plate 46 intermittently rises below this hold position Y ₂ and then rises all at once to the upper limit position Y ₃ is Y _{1 , and the initial position of the lift plate 46 is Y 2} . The position where the top surface of the blank 12 reaches by the upward movement (the upward movement immediately after replacing the magazine 11) is defined as _Y4 .
Further, the height from the lower limit position Y ₀ of the lift plate 46 to the above-mentioned position Y ₁ is H ₁ , the height from the position Y ₁ to the upper limit position Y ₃ of the lift plate 46 is H ₂ , and the height from the hold position Y ₂ to the lift plate 46 is H 1 . 46 upper limit position
H ₃ is the height from the lower limit position Y ₀ of the lift plate 46 to the bottom surface of the blank 12 in the magazine 11 immediately after replacement, and H ₄ is the height from the top surface of the blank 12 in the magazine 11 immediately after replacement _. said position
Assuming that the height up to _Y4 is _H5 , the limit switches 50, 51, 52, 54, and 55 are arranged in the following relationship.

That is, the limit switch 51 is disposed at a height _H1 above the upper end of the dock 48 when the lift plate 46 is at the lower limit position _Y0 . Therefore, as shown in FIG. 6, as the lift cylinder 43 rises, the lift plate 46
When it reaches position _Y1 , that is, when it reaches a height _H2 - _H3 before the hold position _Y2 , the limit switch 51 is turned on by the upper end of the dot 48. Then, based on the signal from the limit switch 51, the lift plate 46 moves to the upper limit position _Y3.
The lift cylinder 43 is raised all at once until it reaches .

Further, the limit switch 50 is disposed above the limit switch 51 by the height _H2 . Therefore, as shown in FIG. 7, when the lift plate 46 reaches the upper limit position _Y3 due to the upward movement of the limit cylinder 43, the limit switch 50 is turned on by the upper end of the dot 48. Then, based on the signal from the limit switch 50, the lift cylinder 43 is switched from raising to lowering, and the lift cylinder 43 is lowered until the lift plate 46 reaches the hold position _Y2 .

Further, the limit switch 52 has a height H ₃ +L (dock 4) from the limit switch 50.
8 length) located below. Therefore, the eighth
As shown in the figure, when the lift plate 46 reaches the holding surface _Y2 due to the lowering of the lift cylinder 43, the limit switch 52 is turned on by the lower end of the dot 48. Then, based on a signal from the limit switch 52, the operation of the limit cylinder 43 is stopped. This results in
The lift plate 46 is stopped at the hold position _Y2 .

Further, the limit switch 54 is disposed at a height H ₄ +H ₅ above the lower end of the lift head 45 when the lift plate 46 is at the lower limit position Y ₀ . Therefore, the limit switch 54 is turned on by the lift head 45 until the lift cylinder 43 rises by a height H ₄ +H ₅ from the initial position. While the limit switch 54 is on, the lift cylinder 43 is raised at once. As a result, after replacing the magazine 11, the upper surface of the blank 12 in the magazine 11 is held by the holding device 21.
It will be raised all at once to the position _Y4 within.

Further, the limit switch 55 is disposed at the lower end position of the lift head 45 when the lift plate 46 is at the lower limit position _Y0 . Therefore, when the lift plate 46 reaches the lower limit position _Y0 , the lower end of the lift head 45 turns on the limit switch 55. limit switch 5
The signal from 5 is used to detect that the lift plate 46 is located at the lower limit position Y ₀ when replacing the magazine 11.

Next, the operation of this embodiment will be explained. First, after replacing the magazine 11, when the lift cylinder 43 is driven, the piston rod 4 of the lift cylinder 43
4 is raised all at once until the limit switch 54 is turned off. Then, the piston rod 44
With the lifting of the lift plate 46 connected to the blanks 12, the blanks 12 accumulated in the magazine 11 are sequentially pushed upward through the latch claws 26 in the holding device 21, and the upper surface thereof reaches the position _Y4 .
At this time, the blank 12 in the holding device 21
are held horizontally within the four guides 24 and separated from each other by the magnetic force from the magnets 27 provided within the four guides 24.

Here, the disk stack cylinder 33 of the transfer device 31 is driven to advance its piston rod downward, and after the uppermost blank 12 is attracted to the suction cup 36, the piston rod is retreated upward, and then By horizontally moving the transfer plate 32 toward a press machine or the like, the blanks 12 can be reliably fed one by one to the press machine. At this time, when the number of blanks 12 in the holding device 21 decreases and the lowering position of the suction cup 36 reaches a certain level or less, the piston rod 44 of the lift cylinder 43 is raised by a certain amount in response to a signal from the limit switch 40, for example. As shown in FIG. 5, the height of the top surface of the blank 12 within the holding device 21 is maintained within a certain range.

In this way, in the process of feeding the blanks 12 one by one to the press mechanism via the feeding device, the lift plate 46 is placed at a position lower than the hold position _Y2 by a height _H2 - _H3 , as shown in FIG. When _Y1 is reached, the limit switch 51 is turned on by the upper end of the dot 48. Then, the lift cylinder 43 is raised all at once by the hydraulic control circuit 61 via the cylinder drive circuit 62. As a result, the remaining blanks 12 stacked in the magazine 11 are pushed up into the holding device 21.

Eventually, as shown in FIG. 7, the lift plate 4
When the top surface of the dot 6 reaches the upper limit position _Y3 , the dot 48
The limit switch 50 is turned on by the upper end of. Then, the hydraulic control circuit 61 switches the lift cylinder 43 from raising to lowering, and the lift cylinder 43 is lowered.

During this descending process, as shown in FIG. 8, when the lift plate 46 reaches the hold position _Y2 ,
Limit switch 52 is turned on. the result,
The drive of the lift cylinder 43 is stopped, and the lift plate 46 is stopped at the hold position _Y2 . As a result, even if the number of blanks 12 held in the holding device 21 decreases, the horizontal locking surface 26 of the lift plate 46 and the latch pawl 26
Since the blank 12 is kept in a horizontal position by A, the transfer device 31 can safely and reliably feed every last blank to the press machine.

On the other hand, after all the blanks 12 in the holding device 21 are discharged, the lift cylinder 43 is lowered. Then, the lift plate 46 moves to the lower limit position Y ₀
When the limit switch 55 is reached, the lift head 45 turns on the limit switch 55. Thereby, the magazine 11 can be replaced on the condition that the limit switch 55 is turned on.

Therefore, according to this embodiment, the lift cylinder 4
3, when the lift plate 46 reaches a position Y ₁ in front of the hold position Y ₂ at a height H ₂ - H ₃ , it is raised all at once to the upper limit position Y ₃ and then lowered, and during this lowering process, the lift plate 46 Since the blank 12 held in the holding device ₂₁ is stopped when it reaches the hold position Y2, the blank 12 held in the holding device 21 can be held in a horizontal position at all times by the lift plate 46 and the horizontal latch claw 26. can.

As a result, even if the number of blanks 12 held in the holding device 21 is low, the last one
After the sheet is safely and reliably adsorbed by the transfer device 31, it can be supplied to a press machine or the like.

In addition, limit switches 50, 51, 5 are used to control the drive of these lift cylinders 43.
2 and 54 and control the operation of the lift cylinder 43 based on the signals from these, this can be done relatively easily and easily.

In the above, the magazine 11 which is exchanged and placed above the lift device 41 stores the blank 12 having a shape and size corresponding to the pressed product to be press-formed, and the magazine 11
When the lift plate 46 is replaced, the guide 24 with the latch claw 26 of the holding device 21 is adjusted in the horizontal direction, so that when the lift plate 46 reaches the hold position _Y2 , it can be formed into any shape and size. A central portion of the lower surface of the blank 12 is held by a lift plate 46, and an end portion of the lower surface of the blank 12 is held by a latch claw 26.

In the above embodiment, the lift plate 46 was made to coincide with the holding surface _Y2 , but the stopping position of the lift plate 46 only needs to be approximately coincident with the holding surface _Y2 , and may be slightly shifted vertically. It doesn't matter if.

Further, in the above embodiment, the guide 24 of the holding device 21 includes the magnet 27, but the guide 24 and the magnet 27 may be constructed separately. In this case, if the magnet 27 is placed between the guides 24 adjacent to each other, an ideal separation effect can be achieved.

[Effects of the Invention] As described above, the present invention provides a stack feeder that can safely and reliably transport up to the last blank even when the number of blanks remaining in the holding device is running low. can do.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a partially cutaway front view showing the lift device, FIG. 3 is a block diagram showing the circuit configuration, FIG. 4 is an explanatory diagram showing the positional relationship between the hold device and the lift plate, and FIGS. 5 to 8 9 and 10 are diagrams for explaining the problems caused by the conventional disk feeder, respectively. 11...Magazine, 12...Blank, 21...
...Hold device, 31... Transfer device, 41... Lift device, 50... Limit switch as upper limit position detector, 52... Limit switch as hold position detector, 61... Hydraulic control circuit.

Claims (1)

[Claims] 1. A magazine stacked with blanks is placed between a lower lifting device equipped with a lift plate that moves up and down and an upper holding device equipped with a latch claw that can be rotated up and down, and when the lift plate is raised, The blank is pushed up and the latch claw is rotated upward by the blank, and among the blanks, the blank that reaches above the latch claw is picked up by an adsorption member that is vertically movable above the holding device. One by one, the uppermost blank is lowered to a predetermined height higher than the latch claw, and then the lift plate is raised to push up the blank, and then the suction member is used to lift the blank up again. The blank is taken out, and the process of pushing up the blank by raising the lift plate and taking out the blank by the suction member is repeated, and after the lift plate reaches a predetermined height position lower than the height of the latch claw, the lift plate is lifted up. In the blank data stacking method in which the plate is raised all at once to a predetermined height position higher than the latch claw, after the lift plate is raised to the predetermined height position higher than the latch claw, the lift plate is returned and rotated. The blank is lowered to the same height as the horizontal locking surface of the moved latch pawl, whereby the blank is supported by the lift plate and the horizontal locking surface of the latch pawl, and then the blank is moved by the suction member. A method for stacking blanks, which comprises taking out the blanks one by one, and lowering the lift plate after all the blanks have been taken out.