JPS60188241A - Method of taking out unit of workpiece - Google Patents

Abstract

PURPOSE:To reduce man hours for manual operation and a space for loading workpieces and as well to aim at enhancing the efficiency of working, etc., by deenergizing at least one of electromagnet at a position where a workpiece is lifted up, when the workpiece is attracted to a plurality of electromagnets to be taken out from a stack position. CONSTITUTION:When one of plural workpieces 30 which are loaded on a pallette 29 at a stack station A is transferred to the next process station B, a base plate 25 is at first lowered by means of a cylinder 23 so that a plurality of electromagnets 28 are made abut against the outer surface of a workpiece 30 at the topmost position. Next the electromagnets 28 are strongly energized so that the electromagnets 28 attract the workpiece 30 in the vicinity of both end flanges thereof and the projecting top part of the same. Then the electromagnets 28 are lifted up together with the workpiece 30. At this time, if more than one of workpieces 30 are simultaneously lifted up, the magnetic force of at least one of the electromagnets 28 is weakened so that the affection is made to those subsequent to the second one of workpieces 30. With this arrangement, those subsequent to to the second one of the workpieces 30 are separated from the first one.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for taking out unit workpieces that ensures that stacked workpieces can be taken out in units of units.

[Prior art]

For example, as shown in FIG. 1, when a plurality of plate-shaped workpieces 1 and 2.8 having flanged FM portions are stacked one after another, only one workpiece 8 among them is held by the workpiece holding means. When the workpieces 8 are adsorbed and transported to the next process, the flange 8a of the stacked workpieces 8 interferes with the flange and jig 2a of the workpiece 2, and this flange 2a further interferes with the flange 1a of the workpiece 1. from,
Alternatively, especially for workpieces that do not have flanges, the air between each workpiece having a smooth surface is removed and the workpieces become attracted to each other, so that by suction conveyance by the workpiece holding means, There was a risk that not only the required work 8 but also the work 2 or the works 2 and 1 would be transported to the next process at the same time.

Therefore, in order to solve this problem, conventionally.

For example, as shown in Figure 2, each workpiece 1, 2° 8.4
The stacking of the works 1, 2, 8.4 is avoided by separating them and placing them sequentially on the claws 6, 6 of the pallet 5. A take-out device consisting of a base plate 9 fixed to the tip of the shilling-10 rod 8 and an electromagnet 11 suspended from the pace plate 9 by a chain 10 was used to sequentially adsorb and transport the materials to the next process.

However, in such conventional technology, each workpiece is placed on different claws 6, 6 of the pallet 5, and the workpieces are transferred to the pallet 5. In addition to the problem of requiring man-hours for the process, there was also the problem of increasing the loading space for the workpieces, resulting in low work efficiency and low floor space utilization efficiency.

[Purpose of the invention]

This invention was made by focusing on the problems of the prior art, and provides a method for taking out unit workpieces that reduces the number of work steps and workpiece loading space, and significantly increases work efficiency and floor space utilization efficiency. It is something to do.

[Structure of the invention]

The method for taking out a unit work according to the present invention is as follows: At the lifting position of the work, at least one of the plurality of electromagnets that magnetically attracts the work is deenergized, so that the work is deflected by its own weight, and the surplus work is removed. It is dropped to the work stack position.

According to this retrieval method, when the workpiece is deflected due to deenergization of the electromagnet, the interference of the surplus workpiece with the workpiece to be taken out is effectively canceled and the surplus workpiece falls back to its original position, so that the unit workpiece is always reliably removed. This brings about a new kind of extraction.

Note that depending on the shape of the workpiece and other factors, it may be necessary to reduce the energy of the iry m stone only once, which will cause the workpiece to be 11. ) If it is difficult to solve the problem, the workpieces can be mutually separated by repeatedly deenergizing and energizing the same electromagnet or by alternately deenergizing and energizing that electromagnet and other electromagnets. This can lead to advantageous cancellation of interference.

〔Example〕

The present invention will be explained below based on illustrated examples.

FIG. 8 is a front view illustrating the apparatus for implementing the present invention, and FIG. 4 shows the operating state of the apparatus shown in FIG. 3 (Ii 1 side view).

In Fig. 8, 21 indicates a loader, and this loader 21 moves from the workpiece stack position A to the next processing position. #: Supported by an overhead type rail 22 extending to B, and guided in running.

Here, the loader 21 includes a lifting cylinder 28 as a lifting device and a cylinder rod 24 of the lifting cylinder 28.
, a kite rod 26 that guides the elevation of the base plate 25, and a plurality of electromagnets 28 suspended from the base plate 25 by chains 27.

The number of electromagnets 28 in this example is six in total, with eight rows of two electromagnets each, but it goes without saying that this number can be changed as appropriate depending on the shape and dimensions of the workpiece.

With the device configured in this manner, when one of the plurality of workpieces 80 stacked on the pallet 29 at the stacking position A in FIG. , the base plate 25 and the electromagnets 28 are lowered to remove all the electromagnets 28.
are brought into contact with the surface of the uppermost workpiece 800 at the same time. At this time, the ascending cylinder 28 is, for example, an electromagnet';!
, 8 is stopped.

Next, by energizing all the electromagnets 28, preferably at the highest strength, the cross-sectional shape becomes approximately ()-shaped as shown in FIG. 4, and flanges Boa are formed at both ends.
In the vicinity of the flange and the top of the work 80 having
The electromagnets 28 are each magnetically attracted. FIG. 5 is a route plan view showing such an adsorption state of the electromagnets 28. In this example, two electromagnets 28 a - r + 28 a are attached to each side of the work 30 which is a solo vanel.
2 and 28b,.

28b, and two electromagnets 28c in the center.
28 c2 are adsorbed, respectively.

1' After the magnetic adsorption operation is completed, the lifting cylinder 2
3 is activated to raise the base plate 25 and the electromagnet 28 together with the workpiece 80 to a certain height. Note that when the workpiece 30 is raised in this way, the flanges 80a interfere with each other.
As shown in the figure, it is common for a plurality of workpieces to be lifted at the same time, so in this case, the following operation is performed to leave only the unit workpieces on the electromagnet 28.

In this example, first, the electromagnet 28 C1128C2, which is attracted to the central part of the workpiece 80, is deenergized, and preferably, the electromagnets 28a, 28a2, and 28C1+ are also deenergized.
1+ The magnetic force of 28C2 is weakened to the extent that it does not affect the second and subsequent works 80. Work by this: U0ha,
Based on the weight of the central portion, the workpiece 80 deforms downward, particularly under elastic deformation at the bent portion, as shown in FIG. As a result, the mutual interference of the plurality of workpieces at the center part is loosened, and the mutual interference at the flange part of the workpieces is also loosened, so that the second and subsequent workspieces 30 return to their original shapes due to their elastic restoring force. Meanwhile, the first workpiece 80 also separates and falls to its original stack position. Thereafter, by making the magnetic force of all the electromagnets 28 the strongest, strong magnetic adsorption of the first workpiece 80, in other words, the center and both sides of the unit workpiece, is achieved. FIG. 81 is a side view showing this state, and as described above, only the unit work 30 remains in the electromagnet 28 while maintaining its initial shape as shown in the figure. Above 30,
At the same time, the unit workpiece 80 is transported to the next process by N iRJ+ to the next process position %B, and then the workpiece 800 is lowered to a predetermined position 1i and the magnetic attraction is released in sequence. end.

The loader 21, which has completed the -th transport process, waits for subsequent transport by raising the base plate 25 and moving to a stack position mA (not shown by a solid line in FIG. 8) =b.

Above, we have described an operation example for leaving only a unit workpiece in the electromagnet 28.However, if the electricity (screen 28c + 28C2) that is attracted to the center of the workpiece 28 is deenergized only once, the second or lower If the workpiece 30 cannot be separated sufficiently, advantageous separation of the workpiece 30 can be achieved by repeating deenergization and energization of the stones 28c+28C2 multiple times.

In another example, the electromagnet magnetically attracted to at least one side of the workpiece 80 is deenergized once or multiple times. In this case, 1. When the electromagnet is deenergized, one or both sides of the work 80 elastically deforms downward due to its own weight, which loosens the interference between the works and causes the second and subsequent works 8o to fall to the stack position. do.

A further example is more preferably carried out in combination with the first example, and in the route plan shown in FIG. The workpieces 8o are arranged diagonally as a pair, and each pair is alternately de-energized and energized.This also ensures that interference between the workpieces is eliminated.

Although this invention has been explained above based on illustrated examples, 't4
If there are two garden stones, you can de-energize only one or alternately de-energize and energize them, or if there are three or more, you can de-energize and energize each of them in turn. By energizing the workpieces, mutual interference between the workpieces can be avoided.

〔Effect of the invention〕

Therefore, according to this invention, in particular, by deenergizing at least one of the plurality of electromagnets that magnetically attract the workpiece at the lifting position 1, the workpiece is deflected by its own weight, and the surplus I workpiece is Since the unit workpiece can be dropped to the workpiece stack position, the unit workpiece can always be reliably taken out without increasing the number of work hours or other inconveniences.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing the interference state of the work flange, Fig. 2 (aJ, (bJ is the positive h) showing the conventional example, respectively.
Sectional view taken along line bb in Figure j and Figure 2(a), No. 8
The figure is a front view showing an embodiment of the present invention, FIG. 4 is a side view showing the operating state of the device shown in FIG. 8, FIG. 5 is a route plan view showing the state of magnetic attraction of a workpiece, and FIGS. FIG. 2 is a sacroplane view illustrating a process of taking out a unit workpiece. 21...Low f 23...Elevating cylinder 25...
・Base plate 27... Chain 28... Electromagnet 29... Pallet, 30... Workpiece A... Stack position B... Next processing position. Patent Applicant Nissan Motor Co., Ltd. Representative Patent Attorney Aki Sugimura Patent Attorney Oki Sugimura Figure 1 Figure 2 (a) ('b, + Figure 5 71 S1 Figure 6 Figure 8

Claims (1)

[Claims] L. A method for taking out a unit work, which is characterized in that when a work is magnetically attracted to a plurality of electromagnets and taken out from a stack position, at least one electromagnet is deenergized at a work lifting position.