JPS61279486A - Method of controlling magneto-attractive force of magneto-attractive conveyor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for controlling the magnetic force of a magnetic conveyance device that attracts and conveys a conveyed object by magnetic force. It is designed to prevent

<Prior Art> Conventionally, a magnetization mechanism that combines a permanent magnet and an electromagnet has been used to transport a magnetic object. This magnetic attachment mechanism uses a permanent magnet to magnetize the transported object, and when the transported object is transported to a predetermined position in a magnetically attached state, an electromagnet generates a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet. release things. The object to be transported may be a plate made of a magnetic material such as a steel plate, or a non-magnetic box-like body with a piece of magnetic material such as an iron plate on the top surface.

A specific example of the prior art will be explained based on FIGS. 3 and 4. The example shown in both figures is an apparatus that transports a cartridge containing microfiche film (hereinafter referred to as "microfiche") from a stocker to a reproducing machine such as a league or a league printer.

As shown in FIG. 3, when handling a large number of microfiche 1, these microfiche 1 are stored in a cartridge 2 and handled at once, and as shown in FIG. A system is used in which a stocker 3 is attached to a regenerator 4. Cartridge 2
An iron plate 5 is attached to the upper surface of the cartridge 2, and the cartridge 2 is magnetically attached by a magnetic conveyance device 6 and conveyed between the stocker 3 and the regenerator 4. Cartridge 1 is regenerator 4
When the microfiche 1 is transported to the cartridge 2, a desired one of the microfiche 1 in the cartridge 2 is pulled out and reproduced, and the image information is projected on the screen 4a or hard-copied.

The magnetic transport device 6 will be described in more detail. The magnetic conveyance device 6 includes a magnetic attachment section 7 and a conveyance mechanism 8. Both will be explained and explained in turn.

The magnetic attachment part 7 is formed by incorporating a permanent magnet and an electromagnet. The permanent magnet magnetically attaches the iron plate 5 of the cartridge 2,
It has sufficient magnetic force to suspend the cartridge 2 containing the microfiche 1. On the other hand, the electromagnet generates a magnetic flux opposite to the magnetic flux of the permanent magnet when the cartridge 2 is conveyed from the stocker 3 to the regenerator 4 or when the cartridge 2 is conveyed from the recycler 8!4 to the stocker 3.
It has the function of releasing and placing it on the regenerator 4 or stocker 3. In this case, the magnetic force of the electromagnet is made approximately equal to the magnetic force of the permanent magnet. The reason for this is that if the magnetic force of the electromagnet is too weak, the cartridge 2 cannot be released, and conversely, if the magnetic force of the electromagnet is too strong, the iron plate 5 of the cartridge 2 will be magnetically attached by the magnetic force of the electromagnet. This is because it becomes impossible to release.

Next, the transport mechanism 8 will be explained. A guide bar 9 is fixed to the wall surface of the stocker 3, and a slider 10 is magnetically attached to the guide bar 9 so as to be freely slidable. A chain 11 is stretched between gears 12 and 13, and a motor 14
Driven by The chain 11 and slider 10 are coupled together. Therefore, when the chain 11 is operated by the motor 14, the slider 10 moves between the stocker 3 and the regenerator 4. On the other hand, the frame 15 with the magnetic attachment part 7 on the bottom is equipped with a motor 16 and a feed screw 17, and when the motor 16 is driven, the feed screw 17
is set to rotate. The feed screw 17 is screwed into a nut portion 18 fixed to the slider 10. Therefore, when the feed screw 17 is rotated by the motor 16,
The frame body 15 moves up and down with respect to the slider 10.

In this conventional technique, the magnetic force of the electromagnet is generated only when the cartridge is released, and the cartridge 2 is magnetically attached by the magnetic force of the permanent magnet during transportation. Therefore, even if there is a power outage during transportation, the cartridge 2 is almost never dropped during transportation.

<Problems to be Solved by the Invention> By the way, the above-described magnetic conveyance device 6 accelerates at the start of conveyance, maintains a constant speed during the middle, and decelerates when stopped. Therefore, when accelerating or decelerating to start or stop conveyance, the magnetically attached part 7
A large moment acts on the cartridge 2, which is magnetically attached. Furthermore, during the first step-by-step transport for aligning the origin, that is, during the initialization, the transport is temporarily stopped at a home position, which is a predetermined position. Therefore, since deceleration and acceleration are performed continuously at the home position for initialization, the magnetically attached cartridge 2 is swung in the transport direction when decelerating, returned to the normal position when stopped, and reversed to the transport direction when accelerating. Get dumped. Therefore, when the timing of swinging back matches the timing of swinging in the opposite direction to the flying direction, an extremely large moment 1- acts on the cartridge 2. Therefore, during acceleration and deceleration, particularly during acceleration and deceleration at the home position during yeshierization, the cartridge 2 may be thrown off from the magnetic attachment portion 7.

In view of the above-mentioned prior art, the present invention provides for
In particular, it is an object of the present invention to provide a method for controlling the magnetic force of a magnetic conveyance device that reliably conveys objects without causing them to fall during acceleration or deceleration.

Means for Solving the Problems> The present invention achieves the above object by using a permanent magnet having a magnetic force capable of magnetically attaching and suspending an object to be conveyed, and a magnetic flux that generates a magnetic flux that cancels the magnetic flux due to this permanent magnet. In a method for controlling the magnetic force of a magnetic conveyance device, which includes a magnetized section consisting of an electromagnet that releases an excited and magnetized conveyed object, and a conveyance mechanism that moves this magnetically attracted section, the conveyed object is magnetized. When the magnet is magnetically attached at the attachment part and transported by the transport mechanism, the electromagnet is excited to generate magnetic flux in the same direction as the magnetic flux of the permanent magnet at least during acceleration and/or deceleration.

<Example> The present invention will be explained in detail below.

FIG. 1 shows the state of the magnetic attachment section 7 which is transporting the cartridge 2 by applying the method of the present invention.

As shown in the figure, the magnetized portion 7 includes a permanent magnet 7a and an electromagnet 7.
The cartridge 2 containing the microfiche can be suspended only by the magnetic force of the permanent magnet 7a. Furthermore, in this embodiment, a microswitch 19 is provided in the magnetic attachment part 7. Micro switch 1
9 is pressed by the top surface of the cartridge 2 when the magnetic attachment part 7 magnetizes the cartridge 2 and turns on, and when the cartridge 2 is released from the magnetic attachment part 7 it is turned off.

An excitation circuit for exciting the electromagnet 7b will be explained based on FIG. 2. In the figure, 20 is a rectifier, 21 is a normally open contact type electromagnetic relay, 22 is a changeover switch, and 23 is a transistor. AC voltage is applied to terminals A and B, and a control voltage of 10 V is applied to terminal C. When the microswitch 19 is turned on, a voltage is applied to the terminal E, and when the microswitch 19 is turned off, no voltage can be applied.

Here, the operation when transporting the cartridge 2 from the stocker 3 to the regenerator 4 will be explained. The frame body 15 is stopped above the desired cartridge 2 by the operation of the motor 14 of the transport mechanism 8, and the magnetically attached part 7 is lowered toward the desired cartridge 1-ridge 2 by the operation of the motor 16. When the magnetic attachment part 7 descends, the cartridge 2 is first magnetically attached to the magnetic attachment part 7 by the magnetic force of the permanent magnet 7a. When magnetized, the microswitch 19 is turned on, a voltage is applied to the terminal E in FIG. 2, and the changeover switch 22 is turned on to the terminal 22a side. Since a voltage is applied to the terminal E, the transistor 23 becomes conductive, and current flows through the coil 21a of the electromagnetic relay 21, energizing it and closing the contact 21b. When the contact 21b is closed, a direct current output from the rectifier 20 (passes through the electromagnetic relay 21 and the changeover switch 22, and flows in the direction of arrow F in the S magnet 7b).

Therefore, the cartridge 2 is also magnetically attracted by the magnetic force of the electromagnet 7b. After all, the cartridge 2 is magnetically attached by the permanent magnet 7a and the electromagnet 7b.

After the cartridge 2 is magnetically attached in this way, the conveying mechanism 8 moves the magnetic attachment section 7 to which the cartridge 2 is magnetically attached.
is pulled upward, conveyed horizontally, stops above the regenerator 4, and descends there.

When the cartridge 2 is placed on the regenerator 4, the changeover switch 22 is switched from the terminal 22a side to the terminal 22b side. Therefore, a current flows through the electromagnet 7b in the direction of the arrow G, and the direction of the magnetic flux of the electromagnet 7b becomes opposite to the direction of the magnetic flux of the permanent magnet 7a, so that both magnetic forces cancel each other out and become zero. be freed from When the magnetic attachment part 7 returns upward in this state, the cartridge 2 is placed on the regenerator 4, and the microswitch 19 is turned off. When the microswitch 19 is turned off, no voltage is applied to the terminal E, and the transistor 23 becomes non-conductive, so that the contact 21b of the electromagnetic relay 21 is opened. Therefore, the energization of the electromagnet 7b is stopped.

In the circuit shown in FIG. 2, the surge voltage generated when the contact 21b is opened and closed can be buffered by the capacitor 24, and the surge voltage generated when the changeover switch 22 is switched is buffered by the CR circuit 25. Also transistor 2
3 changes from a conductive state to a non-conductive state, the coil 21
The follow-on current generated at a circulates in a closed loop formed by the coil 21a and the diode 26, so that the transistor 23 is not overloaded.

In the embodiment described above, when transporting the cartridge 2,
Since the cartridge 2 is magnetically attached not only by the permanent magnet 7a but also by the electromagnet 7b, the cartridge 2 will not be shaken off from the magnetic attachment part 7 even if a large moment acts on the cartridge 2. Furthermore, since no current is applied to the electromagnet 7b when the cartridge 2 is not being transported,
It is possible to prevent the magnetized portion 7 from overheating, and it is also possible to prevent the electromagnet 7b from changing the magnetization characteristics of the permanent magnet 7a.

In the above embodiment, a current was applied to the electromagnet 7b so as to magnetically attach the cartridge 2 during the entire period of transportation.
A current may be applied to the electromagnet 7b so as to magnetically attract the cartridge 2 only during acceleration/deceleration when a large moment acts on the cartridge 2, or only during either acceleration or deceleration. In this way, to apply electricity only during acceleration/deceleration, or only during acceleration or deceleration, the conveyance speed, conveyance distance, etc. are programmed in advance and stored in the computer, and the computer controls the energization using software. do it. Alternatively, the motor 14 may be a stepping motor, and the acceleration/deceleration control time of the motor 14 may be linked with software.

It goes without saying that the present invention can be applied not only to transporting cartridges but also to transporting steel plates and the like.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, the transported object is magnetized not only by the permanent magnet but also by the electromagnet at least during acceleration and/or deceleration during the transport period. As a result, a large moment 1 is applied to the transported object.
Even if an external force such as - is applied, the object to be transported can be reliably transported without being shaken off during transport.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a magnetic attachment part to which the present invention is applied, FIG. 2 is a circuit diagram showing an excitation circuit according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a cartridge containing a microfiche. FIG. 4 is a perspective view showing the microfiche cartridge transport device. In the drawings, 1 is a microfiche film, 2 is a cartridge, 3 is a stocker, 4 is a regenerator, 6 is a magnetic transport device, 7 is a magnetic attachment section, 7a is a permanent magnet, 7b is an electromagnet, and 8 is a transport mechanism.

Claims (1)

[Scope of Claims] A permanent magnet having a magnetic force capable of magnetically attaching and suspending an object to be transported, and a magnetized object that is excited to generate a magnetic flux that cancels the magnetic flux of this permanent magnet to release the magnetized object. In a method for controlling the magnetic force of a magnetic conveyance device that includes a magnetically attracted part made up of an electromagnet and a conveyance mechanism that moves the magnetically attracted part, when an object to be conveyed is magnetically attached to the magnetically attracted part and conveyed by the conveyance mechanism. A magnetic attraction force control method for a magnetic conveyance device, characterized in that the electromagnet is excited to generate magnetic flux in the same direction as the magnetic flux of the permanent magnet at least during acceleration and/or deceleration.