JP4888757B2 - Manufacturing method of magnet roll - Google Patents

Description

  The present invention relates to a magnet for a magnet roll used in a magnet roll mounted on a copying machine, a printer, or the like, a magnet roll using the magnet, and a method for manufacturing the magnet roll. The present invention relates to a technique for accurately bonding a magnet for a magnet roll to a shaft.

  As a developing roll for visualizing an electrostatic latent image formed on a photosensitive drum such as a copying machine or a printer, a magnet roll having a magnet on the peripheral surface of a shaft is widely used. For example, in the jumping method, toner is blown out by the magnetic force of a magnet roll, and this is adhered to the photosensitive drum. In the brush system, a mixture of magnetic powder (carrier) typified by iron powder and toner is conveyed to a photosensitive drum by the magnetic force of a magnet roll. In either case, toner is supplied to the photosensitive drum by the magnetic force of the magnet roll and fixed on paper or the like, whereby characters, images, etc. corresponding to the electrostatic latent image are printed and visualized.

  Various types of magnet rolls are known. For example, as the magnet roll for the jumping method, there are those composed of four poles, a pumping pole, a transport pole, a developing pole, and a collecting pole. As a magnet roll for a brush system, there are a roll composed of 5 poles obtained by adding a peeling pole to the 4 poles described above, and a roll composed of more poles (for example, 7 poles).

  And the magnet for magnet rolls which produces these 4 poles or 5 poles magnetic poles is divided roughly into the following two types. First, a hollow cylinder is integrally formed around the shaft, or a hollow cylinder is formed, and the shaft is fixed to the center. Second, for example, a mixture of magnet powder and a binder is molded into a shape having a substantially sectoral cross section. A plurality of magnets for a magnet roll having a substantially sector cross section are bonded around the shaft to form a cylindrical magnet roll. The shape of the magnet roll is not limited to a cylindrical shape, and various shapes such as a square shape are also known.

  However, in the case of an integrated structure such as the former, it is difficult to form a plurality of magnetic poles and it is difficult to cope with the characteristics. As miniaturization of copying machines and printers progresses, the diameter of the magnet roll tends to decrease, and a high magnetic force is required. In particular, the development electrode (main electrode) used for conveying the toner to the photosensitive drum has severe requirements. With the magnet for a magnet roll having an integrated structure, it is almost impossible to form a developing electrode that can sufficiently meet the requirements.

  Under such circumstances, various types of magnet rolls having the latter structure (a structure in which a plurality of fan-shaped magnet roll magnets are bonded together) have been proposed and improved (for example, see Patent Document 1).

The invention described in Patent Document 1 is intended to control magnetic force, and in a magnet roll formed by combining a plurality of fan-shaped magnet pieces with their main parts inside, a fan-shaped magnet is provided. By changing the shape of the outer periphery of the piece in accordance with the required magnetic properties, the required performance can be satisfied.
JP 2003-209013 A

  By the way, in a magnet roll having a structure in which a plurality of fan-shaped magnet roll magnets are bonded together, there is a problem that when the magnet roll body is assembled, the work efficiency is poor and the magnet for the magnet roll tends to be erroneously bonded. In the magnet roll having the structure described above, it is usual to combine magnet roll magnets having different functions such as a developing electrode, a pumping electrode, a layer regulating electrode, a conveying electrode, and a peeling electrode. These magnet roll magnets having different functions have different magnetic patterns depending on the functions, and it is necessary to bond the magnet roll magnets having different magnetic patterns to the shaft in a predetermined order. At this time, if the magnet roll magnets have the same or similar shape, it is difficult to distinguish from the appearance, which may cause erroneous adhesion. Further, if the magnetic pattern is adhered while being confirmed by a measuring device or the like, the working efficiency is greatly reduced.

  Or the magnetic pattern of the magnet for magnet rolls may be asymmetrical in the circumferential direction of the outer peripheral surface. In such a case, the magnet for the magnet roll has directionality, so it is necessary to pay attention to the direction of attachment to the shaft. However, in this case as well, it is difficult to distinguish the directionality from the appearance, which also causes misbonding and decreases work efficiency.

  In such a situation, in the prior art, for example, marking on the magnet side surface with ink is performed for identification of the magnet roll magnet. However, with this method, when the ink is thin and difficult to discriminate, or when there is too much ink, there is a possibility that the dimensional accuracy and function may be impaired due to protrusion. Also, depending on the type of ink, peeling may occur after marking, which may cause foreign matter adhesion. Furthermore, since marking is performed after magnet molding for a magnet roll, not only does it cause erroneous marking, but also increases the number of processes and increases costs, and improvements are desired. The present invention has been proposed in view of such a conventional situation, and provides a magnet for a magnet roll that can improve work efficiency and prevent erroneous adhesion when assembling a magnet roll. Furthermore, it aims at providing a magnet roll and its manufacturing method.

In order to achieve the above-described object, the method of manufacturing a magnet roll according to the present invention includes a magnet roll in which a plurality of magnet roll magnets having a substantially fan-shaped cross-section divided in the circumferential direction are bonded to and integrated with a peripheral surface of a shaft. The manufacturing method according to claim 1, wherein the outer circumferential surface of at least any one of the plurality of magnet roll magnets is located at a position deviating from a center line in the circumferential direction and is 0.2 mm or more from an end portion in the circumferential direction of the outer circumferential surface. A groove having a depth of 0.2 mm to 1 mm and a width of 0.2 mm to 2 mm is provided at a position away from the center line by 2.0 mm or more and / or at a position of 0.5 mm to 2.5 mm from the end on the side of the outer peripheral surface. The type and / or direction of the magnet for the magnet roll is identified by a groove provided in the magnet for the magnet roll and bonded to a predetermined position of the shaft.

  In the present invention, an identification groove is provided in the magnet for the magnet roll constituting the magnet roll, and the type of magnet for the magnet roll can be easily grasped from the appearance. Therefore, if the magnet for a magnet roll is bonded to the shaft using the identification groove, erroneous bonding can be prevented. In addition, work efficiency is improved because no effort is required for identification.

  In particular, when the improvement of the identification function related to the magnet roll magnet and the influence on the magnetic pattern are considered, the identification groove is located at a position off the center line on the outer peripheral surface of the magnet for magnet roll or on the side surface. Form.

  For example, when the identification groove is formed at the center line position on the outer peripheral surface of the magnet for the magnet roll, the type of the magnet for the magnet roll can be identified, but the direction of the magnet for the magnet roll can be identified. Can not. On the other hand, if the identification groove is formed at a position or a side surface deviating from the center line on the outer peripheral surface of the magnet for the magnet roll, the direction of the magnet for the magnet roll can be grasped. In general, in a magnet for a magnet roll, a peak of a magnetic pattern is often located at the center line position. In such a case, if the identification groove is formed at the center line position, the influence on the magnetic pattern is increased, and there is a possibility that predetermined magnetic characteristics cannot be obtained.

  Forming a groove on the outer peripheral surface of the magnet for a magnet roll is also disclosed in, for example, Patent Document 1 described above. In the invention described in Patent Document 1, the magnetic field distribution is controlled by forming a notch in the central portion of the outer periphery of the magnet piece. Therefore, Patent Document 1 and the present invention have completely different purposes for forming grooves, and Patent Document 1 has no description regarding identification. In the invention of the present application, the groove is formed for the purpose of identifying the magnet for the magnet roll and is formed so as not to affect the magnetic pattern of the magnet for the magnet roll. The technical idea is completely different from the described technology.

  Further, as an example of forming a groove as a positioning means on the outer peripheral surface of the magnet body for the purpose of positioning the magnet roll, for example, the invention described in JP-A-6-230678 can be cited. The groove is intended for positioning when the magnet roll is incorporated into the developing device. Therefore, when assembling a plurality of magnet roll magnets on the shaft as in the present invention, the type and direction of the magnet roll magnets are greatly different. The invention described in the above publication is a cylindrical integrated shaftless magnet roll, which has a structure different from that for adhering a magnet for a magnet roll to a shaft. is there.

  As described above, according to the present invention, when assembling the magnet roll, the type and direction of the magnet for the magnet roll can be easily grasped, and as a result, the work efficiency can be greatly improved. Furthermore, it is possible to prevent erroneous adhesion.

  Hereinafter, a magnet roll to which the present invention is applied and a manufacturing method thereof will be described in detail with reference to the drawings.

  First, the structure of the developing roll in which the magnet roll is incorporated will be described. As shown in FIGS. 1 to 3, the developing roll 1 is configured by incorporating a magnet roll 3 in a cylindrical sleeve 2. The sleeve 2 is formed of aluminum, for example, and is formed as a cylindrical body having a length sufficient to accommodate the magnet roll 3. Further, a gap having a predetermined interval is formed between the sleeve 2 and the inner peripheral surface and the outer peripheral surface of the magnet roll 3 accommodated therein.

  The magnet roll 3 is configured by, for example, arranging a plurality of magnet roll magnets, here, magnet roll magnets 5, 6, 7, 8, 9 divided into five around the shaft 4 made of metal, and bonding and fixing them. Has been. Each of the magnet roll magnets 5 to 9 has a substantially sectoral cross-sectional shape, and by sticking them around the shaft 4, a magnet body having a cylindrical shape as a whole is configured.

  Each of the magnet roll magnets 5 to 9 is formed by extruding or injection molding a mixture containing a binder (plastic or rubber) and magnet powder. Here, the type of the binder is not particularly limited, and specifically, polyamide resin (nylon 6, nylon 12, etc.), polyolefin resin such as polypropylene and polyethylene, polycarbonate resin, nitrile rubber (NBR), chloroprene rubber Synthetic rubber, natural rubber or the like can be used. Examples of the magnet powder include ferrite magnet powder (for example, Sr-based ferrite powder and Ba-based ferrite powder) and rare earth metal magnet powder (for example, SmCo-based, NdFeB-based, SmFeN-based, etc.). What is necessary is just to select according to the characteristic requested | required from these.

  The magnets for magnet rolls 5 to 9 are each magnetized in the radial direction, and the outer peripheral surface side is set to N pole or S pole. For example, the N pole and S pole are arranged alternately on the outer peripheral surface of the magnet roll 1. Are pasted together. These magnet roll magnets 5 to 9 function as a pumping electrode, a layer regulating electrode, a conveying electrode, a developing electrode, and a peeling electrode, and are attached to the sleeve 2 in a predetermined arrangement.

  The shaft 4 is made of a high-strength material such as metal and is longer than the magnet roll magnets 5 to 9 attached to the peripheral surface. Therefore, the magnet roll magnets 5 to 9 are attached to the peripheral surface. When attached, both ends are exposed. Both ends of the exposed shaft 4 are rotatably inserted into flanges 10 and 11 provided at both ends of the sleeve 2 through bearings 12 and 13. One end side of the shaft 4 extends through the flange 10 to the outside, but the other end side is abutted against the flange 11, and a shaft portion 11 a is provided on the flange 11 so as to extend the shaft 4. ing.

  Here, when the shaft portion 11 a is rotationally driven from the right flange 11 side in FIG. 3, the rotation is transmitted to the sleeve 2 via the flange 11. Therefore, the right side flange 11 is called a drive side flange and is formed of a nonmagnetic material (for example, aluminum, aluminum alloy, stainless steel, etc.) having excellent wear resistance. On the other hand, the left flange 10 in FIG. 3 is called a driven flange and has a function of holding the magnet roll 3 in the sleeve 2 and is formed of, for example, aluminum, aluminum alloy, stainless steel, resin material, or the like. The

  The above is the schematic configuration of the magnet roll and the developing roll. In the magnet roll of the present invention, at least one of the magnet roll magnets 5 to 9 (in this example, the magnet roll magnet 5) is used. A major feature is that the identification groove 5c is formed. Hereinafter, the identification groove will be described.

  As described above, the magnets 5 to 9 for the magnet roll function as a pumping electrode, a layer regulating electrode, a conveying electrode, a developing electrode, and a peeling electrode, and need to be attached to the sleeve 2 in a predetermined arrangement. At this time, if the shapes of the magnets 5 to 9 for the magnet rolls are greatly different, there is little possibility that they will be mistaken, and there is little possibility of erroneous adhesion. On the other hand, when the shape of each magnet 5-9 for magnet rolls is the same or approximated shape, it is difficult to identify these by appearance and causes erroneous adhesion.

  Therefore, for example, as shown in FIG. 4, if a groove for identification is provided in at least one of the magnets 5-9 for magnet roll (magnet 5 for magnet roll), the magnet 5 for magnet roll is replaced with another magnet. It can be reliably distinguished from the magnets 6 to 9 for the magnet roll, and can be adhered to a predetermined position according to the arrangement.

  The magnet 5 for a magnet roll is formed in a long shape so that the cross section has a substantially fan shape, and the inner peripheral surface 5a and the outer peripheral surface 5b are each an arcuate curved surface. Particularly, the inner peripheral surface 5 a is an arc surface having a curvature substantially equal to the curvature of the outer peripheral surface of the shaft 4. When the magnet roll magnet 5 is bonded to the shaft 4, the inner peripheral surface 5 a is the shaft 4. The surface contact state is made in a form along the outer peripheral surface. In the case of this example, a groove 5c having an arcuate cross section is formed as an identification groove on the outer peripheral surface 5b and used for identification of the magnet 5 for magnet roll. In addition, in the substantially fan-shaped magnet roll magnet 5, the inner peripheral surface 5a and the outer peripheral surface 5b are usually concentric, but by shifting the centers of curvature, the inner peripheral surface 5a and the outer peripheral surface 5b It is also possible to shift the arc shape from the concentric circle shape.

  Here, the identification groove 5c is formed only in the magnet roll magnet 5, but it is also possible to provide identification grooves in two or more magnet roll magnets. In this case, depending on the pumping pole, layer regulating pole, transport pole, developing pole, peeling pole, etc., the number and position of the identification grooves formed in the magnet for the magnet roll constituting these poles may be changed. It becomes possible to reliably identify the magnets for the magnet rolls that constitute each pole.

  Further, when the magnet roll magnets 5 to 9 are bonded so that the N poles and the S poles are alternately arranged as described above, for example, as shown in FIG. If the identification grooves 5c and 7c are formed in the magnets 5 and 7, the magnetic poles can be bonded to the shaft 4 without making a mistake in the direction of the magnetic poles.

  Furthermore, the identification groove 5c can be used for identifying the bonding direction of the magnet 5 for the magnet roll. For example, as shown in FIG. 6, in the magnetic pattern of the magnet 5 for the magnet roll, when the position of the magnetic field peak is deviated from the center line of the outer peripheral surface (when the magnetic pattern is asymmetric), FIG. ) When the magnet roll magnet 5 is bonded to the shaft 4 and when the magnet roll magnet 5 is bonded to the shaft 4 in the direction shown in FIG. Will be different. Therefore, if the identification groove 5c is formed at a position shifted from the center line as described above, the directivity in consideration of the magnetic pattern of the magnet 5 for the magnet roll can be identified from the position of the groove 5c. The shaft 4 can be securely bonded in a predetermined direction. In addition, the magnetic pattern said here is the magnetic field distribution of the circumferential direction measured on a sleeve corresponding to each magnet for magnet rolls, and in a magnet roll, the magnet roll which has various magnetic patterns according to a function. A magnet is used.

  The identification groove may be formed by, for example, post-processing (groove processing) on the molded body after molding. However, the mold may be provided with a protrusion on the molding die in advance. More preferably, the groove is formed in a shape corresponding to the above. If the identification groove is formed at the time of molding, erroneous marking can be completely prevented, there is no increase in cost due to the addition of post-processing, and there is no generation of foreign matter such as grinding powder by post-processing. Moreover, although the groove | channel may be formed over the full length with respect to the longitudinal direction of the magnet for magnet rolls, the groove | channel may be formed partially. Usually, a magnet for a magnet roll is required to have a uniform magnetic field distribution in the longitudinal direction, and therefore often has a uniform shape. However, since the present invention is characterized by forming a groove that does not substantially affect the magnetic characteristics and facilitates identification, there is no substantial influence of the magnetic characteristics distribution in the longitudinal direction. It is. This partial groove formation can be realized by post-processing after molding or injection molding. On the other hand, groove formation over the entire length in the longitudinal direction can be easily realized by post-processing, injection molding or extrusion molding.

  The identification groove 5c formed in the magnet roll magnet 5 is not limited to that shown in FIG. 4, and various modifications can be made. FIG. 7 illustrates another example of the identification groove 5c. For example, FIG. 7A shows an example in which the identification groove 5c has a substantially V-shaped cross section. However, when considering the formation of the magnet 5 for the magnet roll, it is more advantageous that the groove 5c has a circular arc cross section as shown in FIG. When the identification groove 5c has a substantially V-shaped cross section as shown in FIG. 7A, it is necessary to form a V-shaped part in the mold for forming the magnet 5 for the magnet roll. Mold wear is a concern and product contamination can occur. Examples of other shapes include a rectangular shape and a trapezoidal shape.

  FIG. 7B shows an example in which the identification groove 5 c is formed on the side surface 5 d of the magnet 5 for the magnet roll. When the identification groove 5c is formed on the outer peripheral surface 5b of the magnet 5 for the magnet roll, there is a possibility that the magnetic pattern may be affected. As shown in FIG. 7B, the side 5d of the magnet 5 for the magnet roll is used. If the identification groove 5c is formed on the magnetic pattern, the influence on the magnetic pattern can be minimized. In this way, for the convenience of the magnetic pattern, in addition to the case where the identification groove cannot be put on the outer peripheral surface, when it is desired to clarify the left and right identification, or when there are three or more similar shapes and the identification becomes complicated It is effective to form grooves on the side surfaces.

  FIG. 7C shows an example in which a plurality (two in this case) of identification grooves 5c are provided on the outer peripheral surface 5b of the magnet 5 for magnet roll, and FIG. 7D shows the outer periphery of the magnet 5 for magnet roll. In this example, an identification groove 5c is provided on both the surface 5b and the side surface 5d. In FIG. 7D, the groove 5c on the outer peripheral surface 5b is a V-shaped groove. When composing a magnet roll by combining a plurality of types of magnet roll magnets having different functions, magnetic field distributions, etc., by changing the formation position, number, etc. of the identification groove 5c, the pumping pole, the layer regulating pole, the transport pole, It becomes possible to reliably identify the magnets for the magnet roll constituting the developing electrode, the peeling electrode, etc., and to adhere to the shaft 4 in a predetermined arrangement.

  By the way, when the identification groove as described above is formed in the magnet for the magnet roll, it is necessary to pay attention to the formation position. For example, normally, the peak position of the magnetic pattern in the magnet for a magnet roll is often matched with the center line position of the outer peripheral surface. Therefore, if the identification groove is provided at the center line position, the magnetic pattern is greatly affected. In addition, when the identification groove is provided at the center line position, the directionality cannot be identified.

  Therefore, as shown in FIG. 4, the identification groove 5c is preferably formed along the end of the outer peripheral surface 5b of the magnet 5 for a magnet roll. In this case, the groove 5c extends from the end of the outer peripheral surface 5b. The distance t is preferably 0.2 mm or more. When the distance t is less than 0.2 mm, a portion between the groove 5c and the end of the outer peripheral surface 5b becomes fine, and there is a risk of causing scraping, chipping, dropping off, or the like during molding. In addition, when there exists a notch as shown in FIG. 8 in an outer peripheral edge part, it is the distance from a notch edge part. The distance from the center line is preferably 2 mm or more. When the distance is less than 2 mm, there is a concern about the influence on the magnetic pattern.

  As shown in FIG. 7B, when the identification groove 5c is formed on the side surface 5d of the magnet 5 for the magnet roll, the influence on the magnetic pattern is reduced, but the side surface in consideration of formability and the like. The distance T from the upper part is preferably 0.2 mm to 2.5 mm. When the distance T is less than 0.2 mm, the portion between the groove 5c and the upper end of the side surface becomes fine, and there is a risk of causing scraping, chipping, dropping off, or the like during molding. When the outer peripheral end has a notch 5e as shown in FIG. 8, the distance T is the distance from the end of the notch 5e. On the contrary, if the distance T exceeds 2.5 mm, the groove 5c is formed in a small portion of the magnet roll magnet 5, which is not preferable from the viewpoint of strength and the like.

  Actually, the inventors of the present invention formed a groove having the position and shape shown in FIG. 4 or FIGS. 7A to 7D, and compared the magnetic pattern with a magnet for a magnet roll having no groove. 9 shows the magnetic pattern of the magnet for the magnet roll corresponding to FIG. 4, FIG. 10A to FIG. 10D shows the magnetic pattern of the magnet for the magnet roll corresponding to FIG. 7A to FIG. (A), (b) shows an example in which grooves are formed in a magnet for a magnet roll in which the magnetic pattern peak position is shifted from the center of the cross section, and the magnetic pattern at that time. For comparison, FIG. 12A shows a magnetic pattern of a magnet for a magnet roll without a groove, and FIG. 12B shows a magnetic pattern of a magnet for a magnet roll with a groove at the center line position. Each shown. In each of these figures, the magnetic pattern is shown as the magnetic force waveform in the figure, but the solid line (magnet output waveform) is the actual magnet magnetic pattern, and the broken line (standard magnet waveform) is the non-grooved shape. Respectively show the magnetic patterns of the same magnet. Further, Table 1 shows the dimensions and shapes of grooves formed in each pattern. The various dimensions shown in Table 1 are the dimensions t (distance from the outer peripheral end), T (distance from the upper end of the side surface), S (distance from the peak position), d1, d2 ( (Groove depth) and w1, w2 (groove width).

  As a result, it was found that the magnetic pattern was not substantially changed in any case. On the other hand, it was found that when the identification groove is formed at the center line position of the outer peripheral surface of the magnet for the magnet roll, the magnetic pattern is split at the peak position, and the influence is great.

  On the other hand, as the dimension of the identification groove itself, the depth of the groove is preferably 0.2 mm to 1 mm, and the width of the groove is also preferably 0.2 mm to 2 mm. If the depth or width of the groove is less than 0.2 mm, it becomes difficult to distinguish, and when coloring is applied to improve the distinguishability, the paint for coloring is easily peeled off. Conversely, if the depth or width of the groove is 1 mm or more, or 2 mm or more, the magnetic properties (magnetic pattern, etc.) of the magnet for the magnet roll may be affected.

  When assembling the magnet roll, for example, the magnet roll magnets 5 to 9 need to be bonded to the shaft 4 in a predetermined order, but by providing the magnet roll with an identification groove as described above, Therefore, the types, directions, and the like of the magnets 5 to 9 for the magnet roll can be easily grasped. Therefore, erroneous adhesion of the magnet for the magnet roll can be surely prevented, and work efficiency can be improved.

It is the schematic diagram which looked at the image development roll from the center cross-section direction. It is a disassembled perspective view of a magnet roll. It is a schematic sectional drawing of a developing roll. It is a schematic front view which shows the example of a shape of the magnet for magnet rolls which provided the groove | channel for identification. It is a schematic diagram which shows an example of the identification of the magnet for magnet rolls by the groove | channel for identification. It is a schematic diagram which shows the example which identifies the direction of the magnet for magnet rolls by the groove | channel for identification. (A)-(d) is a schematic front view which shows the other example of a shape of the magnet for magnet rolls which provided the groove | channel for identification, respectively. It is a schematic front view which shows the example of a shape at the time of providing the groove | channel for identification in the magnet for magnet rolls which provided the notch. A solid line is a magnetic pattern of a magnet for a magnet roll having a shape corresponding to FIG. (A)-(d) is a magnetic pattern of the magnet for magnet rolls in the case of providing the identification groove | channel corresponding to FIG. 7 (a)-(d), respectively. It is a figure which shows the example which formed the groove | channel in the magnet for magnet rolls which the magnetic pattern peak position shifted from the cross-section center, and a magnetic pattern at that time. (A) is the magnetic pattern of the magnet for magnet rolls when no identification groove is provided, and (b) is the magnetic pattern of the magnet for magnet rolls provided with a groove at the center of the outer periphery. It is drawing which illustrated the positional relationship of the various dimensions in the groove | channel provided in the magnet for magnet rolls used in Table 1. FIG.

Explanation of symbols

1 developing roll, 2 sleeve, 3 magnet roll, 4 shaft, 5, 6, 7, 8, 9 magnet for magnet roll, 5a inner peripheral surface, 5b outer peripheral surface, 5c identification groove, 5d side surface

Claims (1)

A magnet roll manufacturing method in which a plurality of magnet roll magnets having a substantially fan-shaped cross-section divided in the circumferential direction are bonded to and integrated with a peripheral surface of a shaft,
At least one of the plurality of magnets for magnet rolls at a position deviated from the center line in the circumferential direction of the outer peripheral surface, and 0.2 mm or more from the end portion in the circumferential direction of the outer peripheral surface, and 2.0 mm from the center line A groove having a depth of 0.2 mm to 1 mm and a width of 0.2 mm to 2 mm is provided at a position 0.5 mm to 2.5 mm from the outer peripheral side end of the position and / or the side surface , and this magnet for a magnet roll A method of manufacturing a magnet roll, characterized in that a type and / or direction of a magnet for a magnet roll is identified by a provided groove and adhered to a predetermined position of a shaft.

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