JPH05258954A - Method and apparatus for magnetizing roll-shaped magnet - Google Patents

Abstract

(57) [Abstract] [Purpose] A magnetizing magnet is constructed by arranging a plurality of permanent magnets on a plane, so that no magnetizing power is required, the device can be constructed at low cost, and the running cost is low. To provide a magnetizing method and a device for a magnet. [Structure] A plurality of permanent magnets are installed by holding a roll-shaped magnet (1), and a rotation holding means (2) capable of rotating the magnet at a predetermined peripheral speed, close to or in close contact with the side surface of the roll-shaped magnet. A magnetizing magnet (3) in which magnets (11) are arranged in parallel and plane at predetermined intervals, and a moving means (4) capable of moving the magnetizing magnet in parallel at a predetermined speed while keeping a constant interval between the magnet and the roll magnet. ), The magnetized magnet is moved in parallel at a predetermined speed, and at the same time, the roll magnet is rotated at the same peripheral speed as the speed of the magnetized magnet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for magnetizing a roll-shaped magnet in which the entire circumference of a roll-shaped magnet is continuously magnetized by a magnetizing magnet having a plurality of permanent magnets arranged in a plane. .

[0002]

2. Description of the Related Art A conventional magnetizing device for a roll magnet is shown in FIGS. The magnetizing method by this device is such that one shaft 101 of the roll magnet 100 is supported by a shaft receiver 102 and the other shaft 1
03 is held by the claw 105 of the air chuck 104, and the motor 106 is operated, so that the roll magnet 1
00 can be rotated by a predetermined angle. Here, reference numeral 108 in the drawing denotes a fixed base to which the shaft receiver 102, the motor 106 and the magnetizing yoke 107 are mounted.

As shown in FIG. 6, the magnetizing yoke 107 has a comb-shaped tooth core 109, ... Arranged in an arc shape with a predetermined space provided therebetween, and the coil 11 in the space.
0 is buried, and an electromagnet is constituted by the individual tooth cores 109 and the coils 110 wound around the tooth cores 109.
An arc-shaped magnetized surface 111 is formed on the inner surfaces of the 9, ... Then, in a state where the roll-shaped magnet 100 is attached to this magnetizing device, that is, a state where the roll-shaped magnet 100 is close to the arc-shaped magnetized surface 111, both shafts 101 and 103 are provided.
Each shaft receiver 102 is an air chuck 104
Then, the coil 110 is momentarily energized, and the magnetic force generated thereby magnetizes a portion of the roll magnet 100. Next, after driving the motor 106 to rotate it by a certain angle (required angle), the next portion is similarly magnetized. By repeating this operation several times, the roll magnet 1
On the surface of No. 00, N poles and S poles are alternately magnetized and formed on the entire circumference as shown in FIG.

However, this magnetizing device includes a magnetizing yoke 1
A magnetizing power supply device for energizing the coil 110 of 07 is always required, and electric power is required for magnetizing. Further, this power supply device is generally composed of a DC power supply, a capacitor, and a changeover switch. Since the magnetizing operation cannot be performed while the capacitor is being charged, and a certain waiting time occurs, the productivity is not high. Although it is considered that a plurality of capacitors are used and sequentially discharged from the capacitors that have been charged, the magnetizing power supply device tends to be expensive.

On the other hand, when precision (angle, parallelism, linearity) of magnetic pole arrangement of N pole and S pole is required as shown in FIG.
It is required to manufacture the magnetizing yoke 107 by strictly controlling the machining accuracy of the magnetizing yoke 107, the mounting position accuracy of the coil 110, and the other rotational positioning accuracy (angle, eccentricity) of the roll magnet 100. 107 tooth core 109
Is processing on the inner surface of the circular arc, and as the inner surface has a smaller diameter, in other words, as the curvature increases, the processing becomes more difficult and an expensive apparatus is used.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is to solve the problem by constructing a magnetizing magnet by arranging a plurality of permanent magnets in a plane so that no magnetizing power is required. In other words, it is an object of the present invention to provide a method for magnetizing a roll-shaped magnet and a device therefor which can inexpensively configure the device and have a low running cost.

[0007]

In order to solve the above problems, the present invention uses a magnetizing magnet in which a plurality of permanent magnets are arranged in parallel and in a plane shape at predetermined intervals, and the magnetizing magnet is in a roll shape. The magnet is moved close to or in close contact with the magnet, and the magnetized magnet is moved in parallel at a predetermined speed while keeping a constant distance from the magnet, and at the same time, the magnet is rotated at the same peripheral speed as the magnetized magnet. We have established a method for magnetizing a roll-shaped magnet that is continuously magnetized all around.

More specifically, a roll-shaped magnet is held, and the magnet is installed in close proximity or close contact with a rotation holding means capable of rotating the magnet at a predetermined peripheral speed, along a side surface of the roll-shaped magnet. A magnetizing magnet in which permanent magnets are arranged in parallel and in a plane at predetermined intervals, and a moving means capable of moving the magnetizing magnet in parallel at a predetermined speed while keeping a constant distance between the magnet and the roll magnet,
At the same time as the magnetizing magnet is translated at a predetermined speed,
A magnetizing device for the roll-shaped magnet is constructed by rotating the roll-shaped magnet at the same peripheral speed as the speed of the magnetized magnet.

[0009]

In the method and apparatus for magnetizing a roll-shaped magnet of the present invention having the above contents, the magnetized magnet is formed by arranging a plurality of permanent magnets in parallel and in a plane at predetermined intervals. The magnetizing power is unnecessary, and the magnetizing surface of the planar magnet is moved close to or in close contact with the surface of the roll magnet, and the magnet is moved in parallel at a predetermined speed, and at the same time, the magnet is rolled. By rotating the magnet at the same peripheral speed as that of the magnetizing magnet, the entire circumference of the magnet is continuously magnetized. The magnetizing strength can be changed by adjusting the distance between the magnetizing surface of the magnetizing magnet and the surface of the roll magnet.

[0010]

The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. 1 to 3 are simplified diagrams showing a magnetizing device of the present invention, in which 1 is a roll magnet and 2 is a magnet.
Is a rotation holding means, 3 is a magnetizing magnet, and 4 is a moving means.

The roll-shaped magnet 1 comprises a cylindrical or cylindrical magnet body 5 having shafts 6 and 7 projecting from both ends thereof. As the magnet body 5, a bonded magnet in which magnetic powder is bonded with a synthetic resin or a low melting point metal, a sintered magnet in which magnetic powder is molded at high temperature, and a cast magnet in which molten magnetic alloy is injected into a mold and used are used. When roughly classified according to composition, alloy magnets such as Alnico, Sm-Co, and Nd-Fe-B, and oxide magnets such as ferrite can be used. The roll-shaped magnet 1 is used in a copying machine, a facsimile, an electrophotographic developing device such as a laser printer, and a cleaning device, but its use is not particularly limited.

The rotation holding means 2 is mounted on a fixed base 8, and has a shaft receiver 9 for rotatably supporting one shaft 6 of the roll magnet 1 and the other shaft 7.
And a shaft receiver 10 for rotatably supporting the roller, and is freely rotatable with the roll-shaped magnet 1 mounted. Further, the roll magnet 1 may be forcibly rotated, and in that case, one shaft receiver 10
Shall be replaced by a motor and an air chuck fixed to its rotating shaft. In that case, the shaft 7 of the roll-shaped magnet 1 can be held at a predetermined peripheral speed by holding the shaft 7 of the roll magnet 1 with a claw of an air chuck and pulse-driving the motor. It is also possible to always mount the shaft 7 in association with the motor and use a motor that can freely rotate when no drive signal is input.

As shown in FIGS. 1 to 3, the magnetizing magnet 3 comprises a plurality of long permanent magnets 11, ... Fixed and arranged parallel to each other at a predetermined interval and in a plane shape. 1 is arranged along the side surface. The non-magnetic base 12 for fixing the permanent magnet 11 is preferably made of aluminum, which is easy to perform precision processing, and may be made of synthetic resin. The permanent magnet 11 is fixed to the non-magnetic base 12 in a buried state. Each permanent magnet 11, ...
The envelope surface formed by the end faces of the above forms the flat magnetized surface 13. In this embodiment, the magnetic poles of the permanent magnets 11, ... Located on the flat magnetized surface 13 are set so that the N poles and the S poles alternate. However, the arrangement of the magnetic poles should be set according to the magnetic pole pattern formed on the roll-shaped magnet 1 to be magnetized.

The moving means 4 is attached to the fixed base 8 and a rail member 14 attached to the fixed base 8, a slide base 15 which is slidable with respect to the rail member 14 and fixes the magnetizing magnet 3. It is composed of an air cylinder 16 for driving the slide base 15, and the moving direction of the slide base 15 is set to be a direction orthogonal to the axis of the roll magnet 1. Then, by sending compressed air to the air cylinder 16, the piston rod 17 appears and disappears.
The slide base 15 connected to the tip of the magnet 7 moves, and the magnetized magnet 3 moves in parallel while keeping the distance between the flat magnetized surface 13 and the surface of the roll magnet 1 constant. The moving speed of the magnetizing magnet 3 and the rotating peripheral speed of the roll magnet 1 are synchronous. Also,
The magnetized magnet 3 mounted on the moving means 4 is horizontally arranged with its flat magnetized surface 13 facing upward, and the roll-shaped magnet 1 is positioned above the flat magnetized surface 13. On the magnetized surface 13, only weight or a predetermined load is applied so as to be closely mounted or closely mounted at a predetermined interval. In the present embodiment, the driving force is obtained by the air cylinder, but if a similar driving force can be obtained, for example, a motor driven rack, a pinion mechanism or the like can be adopted.

When the roll magnet 1 is magnetized by using the magnetizing device of the present invention, first, both shafts 6 and 7 of the roll magnet 1 are shaft receivers 9 and 1.
The permanent magnet 11 is mounted on the flat magnetized surface 13 of the magnetized magnet 3 with its axis aligned with the direction of the permanent magnet 11. Then, when the air cylinder 16 as the moving means 4 is driven to move the magnetizing magnet 3 in one direction at a predetermined speed, the frictional force of the contact surface between the flat magnetized surface 13 and the surface of the roll magnet 1 is moved. Thus, the roll magnet 1 is driven to rotate, and the roll magnet 1 is rotated once to continuously magnetize the entire circumference thereof. Since the magnetizing magnet 3 is composed of the permanent magnet 11, the roll magnet 1 is automatically magnetized. At the contact surface where the flat magnetized surface 13 of the magnetized magnet 3 and the surface of the roll-shaped magnet 1 are in contact with each other, the magnetic circuit becomes the strongest, the opposite polarity of the permanent magnet 11 is induced in the roll-shaped magnet 1, and it is rolled as residual magnetism. The surface of the magnet 1 is magnetized.

As described above, the roll-shaped magnet 1 is closely attached in parallel to the flat magnetized magnet 3, or if necessary, the flat magnetized surface 13 of the magnetized magnet 3 and the roll-shaped magnet 1.
If a certain distance is provided between the roll-shaped magnet 1 and the surface of the roll-shaped magnet 1, the magnetizing strength of the roll-shaped magnet 1 can be changed. When a predetermined gap is provided between the flat magnetized surface 13 of the magnetized magnet 3 and the surface of the roll-shaped magnet 1, the moving speed of the magnetized magnet 3 and the peripheral speed of the roll-shaped magnet 1 are the same. By forcibly rotating the motor synchronously, it is possible to magnetize it in the same manner as in the case of close contact.

[0017]

According to the method and apparatus for magnetizing a roll magnet of the present invention as described above, since a permanent magnet is used as the magnetizing magnet, the magnetizing power is different from the conventional magnetizing yoke. It is not necessary and can be used semipermanently, energy can be saved, and the entire circumference of the roll magnet can be continuously magnetized, which contributes to improvement in productivity. The magnetizing strength of the roll-shaped magnet can be easily set (adjusted) by adjusting the distance between the flat magnetized surface of the magnet and the surface of the roll-shaped magnet.

[Brief description of drawings]

FIG. 1 is a simplified plan view of a magnetizing device of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a partially omitted sectional view of a magnetized magnet used in the present invention.

FIG. 4 is a simplified plan view of a conventional magnetizing device.

5 is a cross-sectional view taken along the line YY of FIG.

FIG. 6 is a partially omitted perspective view of a conventional magnetizing yoke.

FIG. 7 is a partially omitted perspective view of a roll magnet magnetized by a conventional magnetizing device or the magnetizing device of the present invention.

[Explanation of symbols]

 1 roll magnet 2 rotation holding means 3 magnetizing magnet 4 moving means 5 magnet body 6 shaft 7 shaft 8 fixed base 9 shaft bearing 10 shaft bearing 11 permanent magnet 12 non-magnetic material base 13 planar magnetized surface 14 rail member 15 slide Base 16 Air cylinder 17 Piston rod

Claims (2)

[Claims] 1. A magnetizing magnet comprising a plurality of permanent magnets arranged in parallel and in a plane at predetermined intervals, the magnetizing magnet being close to or in close contact with a roll magnet, the magnetizing magnet being a roll magnet. The roll-shaped magnet is parallel-moved at a predetermined speed while keeping the interval constant, and at the same time, the roll-shaped magnet is rotated at the same peripheral speed as the magnetizing magnet to continuously magnetize the entire circumference. How to magnetize a magnet. 2. A plurality of permanent magnets are installed in a predetermined manner by holding a roll magnet and rotating and holding the magnet at a predetermined peripheral speed in close proximity to or in close contact with the side surface of the roll magnet. The magnetizing magnets are arranged in parallel and in a plane shape at intervals, and the magnetizing magnets are movable in parallel at a predetermined speed while keeping the distance between the magnets and the roll magnets constant. A magnetizing device for a roll-shaped magnet, wherein the roll-shaped magnet is rotated at the same peripheral speed as the speed of the magnetized magnet while being moved in parallel at a speed.