JP2004061703A - Method for production of magnet roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve precise printing in a magnet roll and a method for the production of the roll. <P>SOLUTION: The magnet roll comprises a sleeve 1 disposed so that it freely rotates, and a magnet 7 disposed in the sleeve 1. Regular projection patterns 8 are formed on the external surface of the sleeve 1 by aluminum oxide coating. Regular recess patterns 9 are formed between them. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a magnet roll used in a copying machine, a printer, a facsimile, and the like.
[0002]
[Prior art]
The magnet roll includes a rotatably provided sleeve and a magnet provided in the sleeve. In addition, countless irregularities are formed on the outer surface of the sleeve, and toner is transported using the countless irregularities.
[0003]
[Problems to be solved by the invention]
In recent years, it has been required that the unevenness provided on the outer surface of the sleeve be more precise.
[0004]
That is, since the resolution is high in a copying machine, the unevenness provided on the outer surface of the sleeve also increases the surface area of the outer surface by forming finer unevenness, whereby a large amount of toner is removed. The device is designed so that it can be transported. However, a problem that has arisen here is that even if the irregularities are made fine in this way, it becomes impossible to make a fine print.
[0005]
It was for the following reasons. That is, in the above-mentioned conventional example, the unevenness is formed by sandblasting. However, in the case where fine unevenness is formed on the outer surface of the sleeve by this sandblasting, the processing time of sandblasting is lengthened, or the sandblasting time is increased. A device is designed to increase the injection pressure.
[0006]
However, if the processing time of sandblasting is lengthened or the injection pressure is increased, the sleeve itself will be curved, and even if the outer surface has fine irregularities, the sleeve itself will be curved. If it did, it would be impossible to make fine irregularities.
[0007]
Therefore, it is conceivable to deposit ink on the outer surface of the sleeve in a predetermined pattern, and then provide a regular concave pattern on the outer surface of the sleeve by etching.
[0008]
In the case where the concave pattern is provided on the outer surface of the sleeve by etching as described above, since the amount of the concave portion per area is stabilized, dense printing can be performed.
[0009]
However, also in this case, there are further points to be improved as follows.
[0010]
That is, in order to form this regular concave pattern, ink must be applied in a predetermined pattern on the outer surface of the sleeve. If the portions are not tightly adhered, the etchant will penetrate from the portions, thereby making it impossible to form a regular concave pattern as originally planned.
[0011]
In such a case, the amount of the concave portion per area becomes unstable and precise printing cannot be performed.
[0012]
Accordingly, an object of the present invention is to enable fine printing.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0014]
According to the first aspect of the present invention, a resist is adhered to an outer surface of a cylindrical sleeve made of aluminum in a predetermined pattern, and then an oxide film is formed on a non-resist-adhered portion of the outer surface of the sleeve. This is a method of manufacturing a magnet roll that forms a regular concave pattern on the outer surface of the sleeve by peeling off the resist adhered to the sleeve, forming an oxide film of aluminum on the outer surface of the sleeve, and then using a predetermined pattern. By peeling off the resist portion that has been adhered, a concave regular pattern having a concave shape can be formed at the portion where the resist has been peeled off. Will be able to
[0015]
The invention according to claim 2 of the present invention is the method for manufacturing a magnet roll according to claim 1, wherein an oxide film is more easily formed by neutralizing the outer surface of the sleeve by etching. Aluminum is generally easily combined with oxygen when exposed to air to form an aluminum oxide film.However, since it is a very thin film, it easily changes due to humidity, temperature, etc., and it is difficult to form a film of a certain thickness. . However, if the initial oxide film on the outer surface of the aluminum sleeve formed by bonding with oxygen in the air is removed by etching with a solution of sodium hydroxide, for example, the oxide film is then anodized. Is formed, a state in which many oxide films are easily formed. Therefore, it is possible to form an arbitrary concave pattern of 0 to 30 μm.
[0016]
Also, the aluminum on the outer surface of the sleeve undergoes a chemical reaction with sodium hydroxide due to the etching solution, and a portion of the aluminum on the surface is dissolved, so that the outer surface of the sleeve is roughened, so that the subsequent resist easily adheres. .
[0017]
Also, when oils and fats adhere to the outer surface of the sleeve, they are removed by etching.
[0018]
Further, impurities can be removed by adding a step of dissolving metallic copper, iron, and the like contained in aluminum with sulfuric acid or the like.
[0019]
With the above, a state where an oxide film can be easily formed can be obtained.
[0020]
By forming the aluminum oxide film in this way, it is possible to increase the surface hardness as compared with conventional aluminum.
[0021]
The invention according to claim 3 of the present invention is the method for manufacturing a magnet roll according to claim 1, wherein the surface of the concave pattern formed on the outer surface of the cylindrical aluminum sleeve is nickel-plated. By applying nickel plating to the surface of the oxide film formed on the substrate, the hardness of the surface of the concave pattern is increased, and fine printing can be performed by eliminating the surface roughness.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0023]
In FIG. 1, reference numeral 1 denotes a cylindrical sleeve, and this sleeve 1 is formed of aluminum. Both ends of the sleeve 1 are open, and flanges 2 and 3 are fixed to the opening. A shaft 4 penetrates the bearing 2 a of the flange 2, and the right end of the shaft 4 is rotatably supported by an inner bearing 6 of the flange 2.
[0024]
The shaft 4 is also supported by the bearing 5 in the inner part of the flange 3. A magnet 7 is fixed to an outer peripheral portion of the shaft 4 in the sleeve 1. That is, in a device such as a copying machine, the flange 3 is rotated via the shaft 3a while the shaft 4 is fixed. In this case, the sleeve 1 fixed to the flange 3 rotates. A plurality of convex patterns 8 are formed on the outer surface of the sleeve 1 as shown in FIG. By forming the plurality of convex patterns 8 in this manner, concave patterns 9 are formed between the convex patterns 8 as shown in FIG.
[0025]
That is, a plurality of linear concave patterns 9 are formed on the outer surface of the sleeve 1 as described above, and when the sleeve 1 rotates, the toner is conveyed in a state of being caught in each concave pattern 9. become. In this case, the concave pattern 9 is formed by forming a convex pattern by adsorbing aluminum oxide on both sides as described above, and the concave pattern 9 has an arbitrary depth up to 30 μm. As a result, the toner is surely conveyed.
[0026]
What is important here is that when a large amount of toner is to be conveyed, it is necessary to increase the number of the concave patterns 9 or to control the depth of the concave patterns 9. Therefore, as a manufacturer of the magnet roll, a plurality of patterns such as the number, arrangement, and depth of the concave patterns 9 are prepared in advance, and one of them is selected according to a user's request. It is formed on the sleeve 1.
[0027]
4 to 8 show another embodiment, and FIG. 4 shows a case where a plurality of convex patterns 8 are curved to form a curved concave pattern 10 therebetween. FIG. 5 shows that the convex pattern 8 has a triangular shape, whereby the concave pattern 11 has a triangular shape. FIG. 6 shows a case where the convex pattern 8 has a square shape, whereby the concave pattern 12 has a square shape. FIG. 7 shows that the convex pattern 8 is formed into a pentagon 13, whereby the concave pattern 13 is also formed into a pentagon. FIG. 8 shows that the convex pattern 8 has a hexagonal shape, whereby the concave pattern 14 has a hexagonal shape.
[0028]
As described above, the manufacturer of the magnet roll prepares various concave patterns 9 to 14 as shown in FIG. 3 to FIG. The toner is reproduced as concave patterns 9 to 14 so that the amount of toner desired by the user can be made uniform and properly conveyed, so that the printing can be performed densely.
[0029]
Hereinafter, a method of forming the above-described concave patterns 9 to 14 on the sleeve 1 will be described.
[0030]
First, as shown in FIG. 9, the sleeve 1 is degreased (A), and then a resist is attached (B) to the surface of the sleeve 1 corresponding to the concave patterns 9 to 14 in FIGS.
[0031]
Thereafter, the resist is thermally cured (C), then degreased (D) and washed with water (E) to complete the resist forming step.
[0032]
Next, the aluminum oxide film naturally formed on the surface of the sleeve 1 is etched (F) with a solution of sodium hydroxide to remove the film from the surface, and then washed with water (G).
[0033]
Next, the surface of the sleeve 1 is treated (H) with sulfuric acid or the like to elute metal copper, iron, and the like contained in aluminum, and then washed with water (I).
[0034]
Next, this sleeve 1 is immersed in a container 15 as shown in FIG. 10, a positive potential is applied to this, and a negative potential is applied to the other electrode 16. To form an aluminum oxide film.
[0035]
The aluminum oxide film is not formed on the resist portion but is formed around the resist portion, and as a result, a convex pattern 8 shown in FIGS. 3 to 8 is obtained.
[0036]
Next, the sleeve 1 is washed with water (K), and thereafter, the sleeve 1 is boiled in a nickel acetate solution, thereby performing a sealing treatment (L) on the holes existing in the aluminum oxide film.
[0037]
Next, the sleeve 1 is washed with hot water (M), and then the resist is peeled off (N) from the surface of the sleeve 1.
[0038]
As a result, between the convex patterns 8 made of the aluminum oxide film on the surface of the sleeve 1, the concave patterns 9 to 14 shown in FIGS.
[0039]
Next, the resist peeling residue adhering to the surface of the sleeve 1 is washed with water (O) and finally dried (P).
[0040]
When nickel plating is performed on the surfaces of the concave pattern 9 and the convex pattern 8 to increase the hardness of the surface, the nickel plating is performed after the drying (P).
[0041]
【The invention's effect】
As described above, the present invention provides a regular concave pattern on the outer surface of the sleeve, so that the toner is conveyed in a uniform state over the entire outer surface of the sleeve. As a result, precise printing can be performed.
[Brief description of the drawings]
1 is a cross-sectional view of one embodiment of the present invention; FIG. 2 is a front view in which a part thereof is broken; FIG. 3 is an enlarged front view of the sleeve; FIG. 4 is an enlarged front view of a sleeve according to another embodiment of the present invention; FIG. 5 is an enlarged front view of a sleeve according to still another embodiment of the present invention. FIG. 6 is an enlarged front view of a sleeve according to still another embodiment of the present invention. FIG. 7 is a view of still another embodiment of the present invention. FIG. 8 is an enlarged front view of a sleeve according to still another embodiment of the present invention. FIG. 9 is a manufacturing process diagram of one embodiment of the present invention. FIG. 10 is a cross-sectional view showing the manufacturing process. Description】
Reference Signs List 1 sleeve 2 flange 3 flange 4 shaft 5 bearing 6 bearing 7 magnet 8 convex pattern 9 linear concave pattern 10 curved concave pattern 11 triangular concave pattern 12 square concave pattern 13 pentagon concave pattern 14 hexagon concave pattern

Claims (3)

A resist is adhered to the outer surface of the aluminum cylindrical sleeve in a predetermined pattern, an oxide film is formed on a non-resisting portion of the outer surface of the sleeve, and then the resist is peeled off. A method of manufacturing a magnet roll in which a regular concave pattern is provided. 2. An outer surface of the cylindrical sleeve which is initially oxidized by being exposed to air is subjected to an alkali treatment, an initial oxide film on the outer surface of the sleeve is removed, and then a resist is attached and an oxide film is formed. Manufacturing method of magnet roll. 2. The method according to claim 1, wherein the surface of the concave pattern formed on the outer surface of the cylindrical sleeve is plated with nickel.

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