JPH02196264A - Method and device for magnetic pole alignment in assembling of magnet roll - Google Patents

Abstract

PURPOSE:To facilitate the alignment of magnetic poles by making the positions of the magnetic poles of a cylindrical magnet which has the magnetic poles on the surface or the magnet roll which uses it correspond to the positions of magnetic pole yokes of the magnetic pole aligning device. CONSTITUTION:The magnetic pole aligning device has the magnetic yokes 2a - 2d around the storage part 1 for the cylindrical magnet or magnet roll. While the power source of the device is turned off, the cylindrical magnet 5 which is magnetized in advance to have the magnetic poles on the surface is inserted into and set in the storage part 1 first. In this case, the magnetic poles of the magnet 5 shift in position from the yokes 2a - 2d. Then a coil 3 is energized and on the yokes 2a - 2d magnetic poles are formed respectively, and the magnet 5 set in the device receives turning force and stops where the magnetic poles of the cylindrical magnet are coincident with the magnetic fields of the yokes. Consequently, the magnetic poles are easily and accurately aligned when the magnet roll is assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for aligning magnetic poles during magnet roll assembly.

[Conventional technology and problems]

Magnet rolls are widely used in developing devices and cleaning devices such as electronic copying machines and facsimile printers.

Conventionally, as this type of magnet roll, one in which a required number of poles of sintered magnets, rubber, or plastic magnets are attached to the peripheral surface of a shaft having a polygonal cross section has been used. However, with such magnet rolls, the manufacturing process is complicated, and since the shaft is polygonal, deflection (bending) is likely to occur, which causes variation in the magnetic force in the longitudinal direction. Misalignment occurs when the magnet is attached, and the positions of various peak magnetic fields, that is, the angle between the poles and the surface magnetic field strength of the poles, fluctuate, and as a result, the copying characteristics deteriorate.

On the other hand, a magnet roll has been proposed in which a rubber or plastic magnet composition is extruded into a cylindrical shape, and a shaft is inserted and bonded into the cylindrical magnet. in this case,
If a shaft with a circular cross section is used, the above-mentioned runout will be reduced and the problem of complicated process will be solved, but on the other hand, it will be difficult to align the poles. In this case, as a method of polar alignment, for example, D
One possible method is to set marks such as cuts and reference lines, mechanically or optically detect and compare these marks with marks set on the shaft, camp, etc., and then assemble the product by aligning the mutually determined positions with a device. . However, in the case of this method, the premise is that the positional relationship between the D-cut or reference line made on the corner surface of the magnet roll and the magnetic pole of the magnet roll is in the correct position (angle) with respect to each other. ,
In reality, it is extremely difficult to maintain this positional (angular) relationship accurately.

[Means for solving problems]

In view of the above circumstances, the present inventor has completed the present invention as a result of intensive research to solve the above problems.

That is, the first aspect of the present invention is to use a magnetic pole positioning device equipped with a plurality of magnetic yokes to align the magnetic poles of a cylindrical magnet 7) that has been magnetized in advance and has a plurality of magnetic poles on its surface, or of a magnet roll using the same. A second aspect of the present invention is a method for aligning magnetic poles when assembling a magnet roll, which is characterized in that the position corresponds to the position of the magnetic yoke. A cylindrical magnet that is magnetized in advance and has a plurality of magnetic poles on its surface, or a magnet using this, in which the reference positions of parts such as shafts and caps for determining the reference plane for determining the magnetic pole position are determined in advance. After setting the roll in the aligning device and correcting the position of the magnetic pole of the cylindrical magnet or the magnet roll by energizing the magnetic yoke of the aligning device to the position of the magnetic nine, A third aspect of the present invention is a method for aligning magnetic poles when assembling a magnet roll, which is characterized by mounting parts. A magnetic pole positioning device for assembling a magnetic roll, characterized in that the position of the magnetic yoke is in a predetermined positional relationship with respect to the reference positions of components such as a shaft and a cap for determining a reference surface for determining the magnetic pole position. The content of each is as follows.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a schematic diagram showing an example of magnetic pole alignment 'A'fl of the present invention, in which a plurality of magnetic yokes (2a) are arranged around a housing part (1) of a cylindrical magnet or magnet roll.
, (2b), (2C), and (2d) are arranged. (
3) is a coil, and a magnetic excavation is formed by energizing the coil. An insulating material (4) such as epoxy resin is filled between the magnetic yokes, and the inside thereof is formed into an arc shape to match the outer shape of a cylindrical magnet or a magnet roll using it, and is used to accommodate the cylindrical magnet or magnet roll. It forms part of Section (1). The positions of the magnetic yokes (2a) to (2d) are predetermined and arranged in a predetermined positional relationship with respect to the reference positions of parts such as shafts and caps for determining the reference plane for determining the magnetic pole position. It is set up.

The method for aligning the magnetic poles when assembling the magnet roll using the above device will be explained based on FIGS. 2 to 4. With the power of the device turned off, ) A cylindrical magnet (5) that has been magnetized in advance and has a plurality of magnetic poles on its surface is inserted and set. In this case, the cylindrical magnet) - (5)
The magnetic poles of the device and the magnetic yokes (2a) to (2d) of the device are offset by α degree in the figure (FIG. 2).

Next, turn on the power to the device as shown in Figures 3 and 4.
When the coil (3) is energized, the magnetic yoke (2a) ~
(2d), and the cylindrical magnet (5) set in the device receives the same rotational force as the rotor of an electric motor, and is placed in the appropriate position, that is, between the magnetic pole of the cylindrical magnet and the yoke. (The magnetic pole opposite to the magnetic pole of the cylindrical magnet) It stops at the place where the position (angle) is negative. In such a state, an adhesive is applied to the inner surface of the hole of the cylindrical magnet (5), and a shaft (7) having a D-cut portion (6) at the end thereof is inserted into the hole to form the D-cut portion (6). ) is glued and fixed upward, for example, the angle θ in the figure will always be constant (FIG. 3), and the positional relationship of the magnetic pole with respect to the reference position (D cut portion) will be constant.

In the above, instead of using the shaft provided with the D cut part as the reference position, as shown in FIGS. 5 and 6,
A cap with a reference position may also be used.

FIG. 5 shows a cap with a rectangular cross section, where (11) is a chamfered portion serving as a reference surface, and (8) is a shaft attachment hole. However, in this case, the chamfered portion may not be intentionally provided, and any surface of the rectangular shape may be used as the reference surface. Figure 6 shows a camp with a cylindrical cross section, where (9) is the reference plane, the D-cut portion of "C", and (lO) are the shaft mounting holes.

To perform magnetic pole alignment using these caps,
Attach a cap to one end of the shaft, and set the chamfered part or D-cut part as a reference position in a certain direction.
The shaft with a cap may be inserted into the cylindrical magnet and fixed with adhesive in the same manner as in the case of Figs. After setting it in the device of the present invention and correcting the magnetic pole position by energizing the device, attach the camp to the shaft and fix it with adhesive so that the chamfered part and D-cut part of the cap are oriented in a fixed direction. You can.

The apparatus of the present invention is capable of applying magnetic force to the magnet roll at the same time as aligning the magnetic poles, and is extremely efficient as it simultaneously achieves the alignment of the magnetic poles and the enhancement of the magnetic force.

[Action/Effect]

As described in Soft Earth, according to the present invention, magnetic pole positioning can be easily and accurately performed when assembling a magnet roll using a simple device. It is also possible to increase the magnetic force of the magnet roll at the same time as aligning the magnetic poles, which is extremely efficient.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the device of the present invention, and FIGS. 2 to 4 are for explaining a magnetic pole alignment method using the device of the present invention. 4 is an enlarged cross-sectional view of the main part showing the state in which the shaft is inserted into the cylindrical magnet, and FIGS. and FIG. 3 are schematic diagrams each showing an example of a cap. l... Cylindrical magnet or magnet roll housing part 23-2d... Magnetic yoke 3... Coil, 4... Insulating material 5... Cylindrical magnet 6.9... D cut part, 7...Shaft 8, lO
...Shaft mounting hole 11 ...Face wing part

Claims (3)

[Claims] 1. Using a magnetic pole positioning device equipped with a plurality of magnetic yokes, the position of the magnetic pole of a cylindrical magnet that has been magnetized in advance and has a plurality of magnetic poles on its surface, or a magnet roll using the same, corresponds to the position of the magnetic yoke. Features a magnetic pole alignment method during magnet roll assembly. 2. The position of the magnetic pole alignment device equipped with a plurality of magnetic yokes and the reference positions of parts such as shafts and caps for determining the reference plane for determining the magnetic pole position are determined in advance, and the positions of the magnetic pole alignment devices are determined in advance. A cylindrical magnet having a plurality of magnetic poles on its surface or a magnet roll using the same is set in the alignment device, and the magnetic yoke of the alignment device is energized to adjust the position of the magnetic poles of the cylindrical magnet or magnet roll to the position of the magnetic yoke. A method for aligning magnetic poles when assembling a magnet roll, the method comprising: mounting a component for determining the reference plane after correspondingly correcting the position. 3. A plurality of magnetic yokes are arranged around the housing part of the cylindrical magnet or magnet roll, and the position of the magnetic yokes is determined relative to the reference position of parts such as shafts and caps for determining the reference plane for determining the magnetic pole position. A magnetic pole positioning device for assembling a magnetic roll, characterized by having a predetermined positional relationship.