JPH03243544A - Separation device for laminated tabular body - Google Patents

Abstract

PURPOSE:To properly absorb a tabular body from the top one by one regardless of the dimension, weight, shape and the like of the tabular body by disposing an electric magnet above the tabular body in spaced relation, absorbing the tabular body with exciting current gradually increased, and thereby holding exciting current at the time when the tabular body is absorbed. CONSTITUTION:An electric magnet 2 is disposed above a laminate in spaced relation, in which tabular bodies 1 furnished with magnetic absorptivity are piled up, and exciting current for the electric magnet 2 is gradually increased by a control device 4. Accompanied with which, the absorbing force of the electric magnet 2 is gradually increased so that one tabular body 1 at the uppermost position of the laminate is absorbed onto the electric magnet 2. At this moment, exciting current for the electric magnet 2 is held so that no tabular body 1 located under a second one is absorbed by the electric magnet 2 with exception that only one tabular body 1 is absorbed onto the electric magnet 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a stacked product in which a large number of plate-shaped bodies, such as steel plates, are stacked and which are controlled by magnetic attraction, and the upper one of the plate-shaped bodies is removed by an electromagnet. The present invention relates to an apparatus for adsorbing and separating lead frames, and the apparatus according to the present invention is used, for example, in an automatic feeding apparatus that conveys stacked lead frames one by one to a predetermined position.

[Conventional technology]

When separating the upper plate by attracting it with an electromagnet from a stack of many plate-shaped bodies such as steel plates, conventionally, calibration is performed in advance so that the magnetic force of the electromagnet matches the object to be attracted. An optimum excitation mt flow value is determined to match the weight of the object, and an electromagnet set to that value is brought into contact with the object to be attracted and separated from the laminate by adsorption.

[Problem to be solved by the invention]

However, when an electromagnet set to the optimum excitation current is brought into contact with an object as described above, a magnetic field is induced within the object due to the contact state between the object and the object below it. Because the adsorption force changes significantly, even if the same object is to be adsorbed, it may not be able to be adsorbed successfully.

In addition, with conventional devices, when the size, weight, shape, etc. of the object to be attracted changes, in order to obtain the appropriate magnetic force each time,
Since it is necessary to reset the excitation current of the electromagnet, it is not possible to flexibly handle a wide variety of objects to be attracted.

Furthermore, in conventional devices, once the excitation current of the electromagnet is set, it is held as is, so if the dimensions, weight, shape, etc. of the stacked objects are not constant, two In some cases, more than one sheet may be attracted, and it is not possible to properly adsorb one sheet at a time.

Therefore, this invention eliminates the need to find and reset the optimum value of the excitation current of the electromagnet when the objects to be attracted change, and also eliminates the need to determine and reset the optimum value of the excitation current for the electromagnet.
It is an object of the present invention to provide an apparatus that can appropriately adsorb and separate sheets one by one from above even when the weight, shape, etc. are not constant.

[Means for Solving the Problems] In order to solve the above problems, the present invention configures a separating device for stacked plate-like bodies as follows.

That is, a predetermined gap is left above a stack of plate-shaped bodies that are attracted by magnets, and tM! This NH3 stone is provided with a t-current control device that gradually increases the excitation current and holds the excitation current when the plate-shaped body is attracted to the electromagnet.

[Operation] When the excitation current of the electromagnet is gradually increased, the attraction force of the electromagnet is gradually increased, and the uppermost plate of the laminate is attracted to the electromagnet. If the excitation M1 current of the electromagnet is maintained at that point, only one plate-shaped body is attracted to the aMi stone, and the plate-shaped bodies of two or less pieces located below it are not attracted to the ari11 stone.

[Example] Hereinafter, an example of the apparatus according to the present invention will be described.

As shown in FIG. 1, a pair of electromagnets 2 are installed above a stack of plate-shaped bodies 1 that are attracted by magnets.

The electromagnet 2 can be moved up and down relative to the plate-shaped body 1 by a lifting mechanism using a servo motor 3. When the electromagnet 2 is lowered by the lifting mechanism, the electromagnet 2
is arranged to stop at a position several inches thick from the top surface of the plate-like body 1.

As shown in FIG. 2, the electromagnet 2 has a current control device 4 that gradually increases the excitation current of the coil 5 from O and maintains the excitation current when the plate-shaped body 1 is attracted to the electromagnet 2.
is installed.

As the sensor 6 for detecting that the plate-shaped body 1 is attracted to the electromagnet 2, a sensor can be used that uses the electromagnet 2 as an electrode and uses the energization due to the attraction of the plate-shaped body 1 as an attraction signal. The time from when the shaped body 1 is attracted to when the excitation current is maintained can be shortened, and the increase in the attraction force during that time can be suppressed to a minimum.

Next, the operation of this embodiment will be explained.

First, the servo motor 3 is driven to lower the electromagnet 2 to a position several inches above the top surface of the plate-shaped body 1.

Next, the current control device 4 starts supplying current to the tMiM2O3 coil 5 to gradually increase the excitation current of the electromagnet 2 from 0. Then, when the excitation current increases and the attraction force of the electromagnet 2 increases accordingly, the minus-th plate-shaped body 1 separates from the two-sided plate-shaped body 1 below it and is attracted to the electromagnet 2.

When the plate-shaped body 1 is attracted to the electromagnet 2, an attraction signal is outputted by energization due to attraction, and this signal causes the electromagnet 2 to
The excitation current of is held at that value.

Thereafter, the servo motor 3 is driven to raise the electromagnet 2 that has attracted the plate-shaped body 1, and the plate-shaped body 1 is moved by an appropriate conveyance means.

[Effects of the Invention] As described above, in the present invention, an electromagnet is installed above a plate-shaped body with a gap therebetween, and the excitation current is gradually increased to attract the plate-shaped body, so that the plate-shaped body is not attracted. Since the excitation current is maintained at the point when the plate-shaped bodies are changed, there is no need to find and reset the optimum value of the excitation current of the electromagnet each time the plate-shaped bodies are changed. Even when the size, weight, shape, etc. are not constant, it is possible to properly adsorb and separate the sheets one by one from the one above.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a device according to the present invention, and FIG. 2 is an operation chart of the current control device. DESCRIPTION OF SYMBOLS 1... Plate-shaped body, 2... Electromagnet, 3... Servo motor, 4... Current control device, 5... Coil, 6...
...Adsorption detection sensor.

Claims (1)

[Claims] (1) An electromagnet was provided with a predetermined gap above the laminated position of the plate-like bodies that were attracted by the magnet, and the excitation current was gradually increased to this electromagnet, and the plate-like bodies were attracted to the electromagnet. 1. A separation device for laminated plate-shaped bodies, characterized in that a current control device is provided to maintain an excitation current at a certain point in time.