JP2010276739A - Method for adjusting magnetic force line of magnet roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for adjusting the magnetic force lines of a magnetic roller, which enables easy adjustment of the magnetic force lines of each of the magnetic poles of the magnet roller and which can suitably be used in the test of magnetic characteristics and fine adjustment. <P>SOLUTION: A method for adjusting the magnetic force lines of each magnetic pole of the magnet roller having a cylindrical magnetic layer 3 with a plurality of magnetic poles includes sticking an adjusting plate 1, made of a magnetic material, to a roller surface above the target magnetic pole or around it, and varying the magnetic force lines of the magnetic pole. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for adjusting the magnetic force lines of a magnet roller, which can easily adjust the magnetic force lines of individual magnetic poles of the magnet roller.

  A magnet formed by a resin magnet in a rotating sleeve as a developing roller for visualizing an electrostatic latent image on a latent image holding body such as a photosensitive drum in an electrophotographic apparatus such as a copying machine or a printer, or an electrostatic recording apparatus. A roller is provided, and the toner is supplied to the surface of the latent image carrier by a so-called jumping phenomenon in which a magnetic developer (toner) carried on the sleeve surface is caused to fly onto the latent image carrier by the magnetic characteristics of the magnet roller. A developing method for visualizing an electrostatic latent image is known.

  The magnet roller is formed into a roller shape by injection molding or extrusion molding a resin magnet composition in which magnetic powder is mixed and dispersed in a thermoplastic resin binder such as nylon or polypropylene, and magnetized to desired magnetic characteristics. However, with recent advances in electrophotographic devices, etc., there is a tendency for more complex magnetic force patterns to be required for magnet rollers. It may be necessary to adjust and change the magnetic field lines for the magnetic poles of the magnetic poles. For example, it may be necessary to adjust the magnetic field lines so as to increase the half width of each magnetic pole.

  Conventionally, as a method of changing the magnetic lines of force of a magnet roller, for example, a method of cutting out a portion corresponding to a magnetic pole for increasing the magnetic force of a shaft and filling the magnet there (Patent Document 1: Japanese Patent Application Laid-Open No. 5-291028), A method of changing the magnetizing condition (Patent Document 2: Japanese Patent Laid-Open No. 2003-243225) is known.

  However, in the former method, it is necessary to process the shaft, and it takes much time to adjust the magnetic field lines on a trial basis, and there is a big problem in terms of simplicity. Even in the latter method of changing the magnetizing conditions, it is necessary to replace the tip iron core portion of the magnetizing yoke in various ways, which tends to be large-scale, and the problem of simplicity remains.

JP-A-5-291028 JP 2003-243225 A

  The present invention has been made in view of the above circumstances, and a magnetic roller magnetic force line adjusting method that can easily adjust magnetic force lines for each magnetic pole of a magnet roller and can be suitably used for magnetic pole characteristic testing and fine adjustment. The purpose is to provide.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have attached an adjustment plate made of a magnetic material such as an iron plate on or around the target magnetic pole on the surface of the magnet roller, thereby producing magnetic field lines of the magnetic pole. Can be changed and adjusted without affecting other magnetic poles, for example, the half-value width of the magnetic field lines can be changed relatively freely for each magnetic pole, and the position, thickness, material, etc. of the adjustment plate can be changed. It has been found that the magnetic field lines can be easily adjusted by changing the magnetic field characteristics, and that it is possible to easily and satisfactorily perform the magnetic pole characteristic test and fine adjustment with an actual machine, thereby completing the present invention.

Therefore, the present invention
(1) A method for adjusting the magnetic lines of force of individual magnetic poles of a magnet roller having a cylindrical or columnar magnetic layer having a plurality of magnetic poles, wherein a magnetic material is formed on or around the target magnetic pole on the roller surface. A magnetic roller magnetic force line adjusting method is provided, characterized in that the magnetic force line of the magnetic pole is changed by attaching an adjusting plate.

Further, the present invention provides, as a more specific embodiment, the following method (2) to (4) for adjusting the magnetic force lines of the magnet roller.
(2) The method for adjusting the magnetic force lines of the magnet roller according to (1), wherein the magnetic force lines are adjusted by changing the material, thickness, width, sticking position, or combination thereof of the adjusting plate.
(3) The method for adjusting the lines of magnetic force of the magnet roller according to (1) or (2), wherein the adjustment plate is an iron plate.
(4) The magnetic roller magnetic field line adjusting method according to any one of (1) to (3), wherein the half-value width of the magnetic field lines of the magnetic pole is adjusted by attaching the adjusting plate on or around the target magnetic pole. .

  According to the method of adjusting the magnetic force lines of the magnet roller of the present invention, the magnetic force lines can be changed relatively freely for each magnetic pole of the magnet roller, and the magnetic force lines can be easily changed by a relatively simple method of attaching an adjusting plate. Adjustment can be performed, and magnetic pole characteristics tests and fine adjustment with an actual machine can be easily and satisfactorily performed.

It is explanatory drawing which demonstrates the magnetic force line adjustment method of the magnet roller of this invention concretely. It is a magnetic force chart which shows the magnetic force line of the magnet roller which adjusted the magnetic force line by the method of this invention in the Example.

  As described above, the method of adjusting the magnetic force lines of the magnet roller of the present invention adjusts the magnetic force lines of the magnetic poles by attaching an adjustment plate made of a magnetic material on or around the target magnetic poles on the surface of the magnet roller. For example, as shown in FIG. 1, a target magnetic pole N2 is formed on the surface of a magnet roller having four magnetic poles, two N poles (N1, N2) and two S poles (S1, S2). By attaching the adjustment plate 1 on top, the magnetic field lines of the N2 pole are changed and adjusted.

  In this case, the magnet roller only needs to have a columnar or cylindrical magnetic layer having a plurality of magnetic poles. For example, as shown in FIG. In the figure, a normal magnet roller having a cylindrical magnetic layer 3 having four poles as described above can be formed. In this case, the material and form of the shaft 2 and the magnetic layer 3 are not limited, and various The present invention can be applied to the magnet roller. In some cases, another layer may be provided between the shaft 2 and the magnetic layer 3, or the magnetic layer 3 and the shaft 2 may be integrally formed. A skin layer may be formed on the outer periphery of the substrate.

  The adjustment plate 1 may be any plate-like material made of a magnetic material. Examples of the material include soft magnetic materials such as iron, ferritic stainless steel, martensitic stainless steel, and precipitation hardening stainless steel. Although it can be selected and used, an iron plate is preferably used particularly in terms of coercive force, magnetic permeability, processing cost, and the like.

  In the present invention, the adjusting plate 1 is attached to or around a desired magnetic pole (N2 pole in FIG. 1) on the roller surface to adjust the magnetic field lines of the magnetic pole (N2). By pasting 1 on the magnetic pole, the half-value width of the lines of magnetic force can be increased. In this case, the adjusting plate 1 having a uniform width and a uniform thickness is usually applied accurately at a predetermined angular position of the magnet roller along the axial direction so that uniform magnetic properties can be obtained along the length direction.

  Here, the magnetic field lines can be further finely adjusted by appropriately changing and adjusting the thickness, width, and sticking position of the adjusting plate 1. In this case, the thickness of the adjusting plate 1 is not particularly limited as long as it does not hinder the rotation of the magnet roller according to the interval between the magnet roller and the developing sleeve arranged outside thereof. Usually, 0.1 to 1 mm, particularly 0.2 to 0.8 mm is preferable. As the thickness of the adjusting plate 1 is increased, the magnetic force at the sticking position can be increased.

  The adjustment range of the width of the adjusting plate 1 is appropriately selected according to the diameter of the roller, the number of magnetic poles, and the like, and is not particularly limited, but is usually adjusted in the range of 1 to 10 mm, particularly 1 to 5 mm. It is preferable to do. As the width of the adjusting plate 1 is generally increased, the existence width (circumferential direction) of the lines of magnetic force can be increased.

  Furthermore, the adjustment position of the adjustment plate 1 can be adjusted on the target magnetic pole or around the target magnetic pole as long as it does not affect the other poles. It is preferable that at least a part of is in a range located on the center of the magnetic pole. In this adjustment of the sticking position, the magnetic force lines can be deformed by shifting the sticking position of the adjusting plate 1 from the center of the magnetic pole.

  The adjustment plate 1 can be attached using an appropriate adhesive or pressure-sensitive adhesive tape, and any adhesive or pressure-sensitive adhesive tape can be used as long as it does not affect the lines of magnetic force. Also good.

  Although FIG. 1 shows an example in which the adjustment plate 1 is used to adjust one magnetic pole per magnet roller having a four-pole configuration, the present invention is not limited to this, and two or three poles are provided. Alternatively, it can be suitably used for a magnet roller having five or more magnetic poles, and the magnetic lines of force can be adjusted by the adjusting plate 1 for a plurality of magnetic poles.

  As described above, the method for adjusting the lines of magnetic force of the present invention is to change and adjust the lines of magnetic force of the magnetic pole N2 by a simple operation of simply attaching the adjusting plate 1 on or around the desired magnetic pole N2 on the surface of the magnet roller. For example, when developing a developing mechanism for an electrophotographic apparatus, it is suitable for testing magnetic force characteristics of a magnet roller, changing the magnetic field lines, and making fine adjustments when the actual machine is installed. Also, it can be suitably used.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not restrict | limited to the following Example.

  Similar to the roller of FIG. 1 in which a magnetic layer 3 (thickness 5.5 mm) made of nylon resin in which ferrite powder is dispersed as magnetic powder is formed on the outer periphery of an iron (SUM23) shaft (diameter 6 mm, length 240 mm) 2. A magnet roller having a four-pole magnetic pole was prepared.

  An iron plate 1 having a width of 2 mm was pasted on the N2 pole of this magnet roller with the center slightly shifted, and the magnetic lines of force of each magnetic pole were measured. In this case, the circumferential magnetic force was measured using a Gauss meter manufactured by Bell Co. at a position 10 mm from the center of the roll. Moreover, the adhesive tape was used for the affixing of the iron plate 1, and the magnetic field lines were measured using two iron plates having different thicknesses. The change in half width of the magnetic pole of this magnet roller is shown in Table 1, and the magnetic force line measurement chart is shown in FIG.

  As shown in Table 1 and FIG. 2, the method of adjusting the magnetic force lines of the present invention makes it possible to easily change and adjust the magnetic force lines of the desired magnetic poles of the magnet roller, and particularly to easily adjust the half width. Is recognized.

DESCRIPTION OF SYMBOLS 1 Adjustment plate 2 Shaft 3 Magnetic body layer N1, N2, S1, S2 Magnetic pole

Claims (4)

  A method for adjusting the magnetic lines of force of individual magnetic poles of a magnet roller having a cylindrical or columnar magnetic layer having a plurality of magnetic poles, comprising an adjustment plate made of a magnetic material on or around a target magnetic pole on the roller surface A method of adjusting the magnetic force lines of a magnet roller, wherein the magnetic force lines of the magnetic poles are changed.   The method for adjusting the magnetic force lines of a magnet roller according to claim 1, wherein the magnetic force lines are adjusted by changing the material, thickness, width, sticking position, or combination thereof of the adjusting plate.   The method of adjusting a magnetic force line of a magnet roller according to claim 1 or 2, wherein the adjustment plate is an iron plate.   The method of adjusting a magnetic force line of a magnet roller according to any one of claims 1 to 3, wherein the half width of the magnetic force line of the magnetic pole is adjusted by attaching the adjusting plate on or around the target magnetic pole.

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