JP2006018189A - Magnet roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily change a magnetic force pattern formed around a magnet roller divided into two. <P>SOLUTION: A cylindrical roller main body 9 is constituted by combining semi-cylindrical members 50 and 60. Either groove-shaped or hole-shaped attaching parts A to G are formed in the longitudinal direction (direction of a roller shaft C<SB>0</SB>) of the roller main body 9, and a corresponding magnetic force adjusting member is attached to the formed attaching part. The roller main body 9 is formed of a resin magnet and the magnetic force adjusting member is formed of a magnet body. By adjusting the position of the attaching part and the strength of the magnetic force of the magnetic force adjusting member, the magnetic force pattern formed around the roller main body 9 is properly changed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnet roller used in a developing device or a cleaning device in an image forming apparatus such as a printer, a copying machine, and a facsimile machine that forms an image using toner.

  For example, in an image forming apparatus such as a printer, a copying machine, or a facsimile that forms an image with toner made of powder, a magnet roller having a plurality of magnetic poles in the circumferential direction is used for a developing device and a cleaning device. The magnet roller used in the developing device develops the electrostatic latent image formed on the surface of the photosensitive drum with charged toner, and the magnet roller used in the cleaning device removes the charged toner remaining on the surface of the photosensitive drum. To be removed.

  Among such magnet rollers, in Patent Documents 1 and 2, a roller body composed of a roller portion and shaft portions projecting at both ends in the longitudinal direction (roller axial direction) is divided into two. An example in which an elongated semicylindrical member is combined is described.

  Among them, the one described in Patent Document 1 is provided with shaft support walls 3 and 4 at both longitudinal ends of one half member 1, and shaft portions 5 and 6 project from the shaft support walls 3 and 4, respectively. In addition, fitting receiving recesses 7 and 7 are formed on the inner surfaces of the shaft support walls 3 and 4. On the other hand, the other half member 2 combined with the half member 1 is provided with coupling walls 8 and 8 at both longitudinal ends thereof, and fitting projections 9 and 9 are projected from the coupling walls 8 and 8. ing. Then, by fitting the fitting projections 9 and 9 of the other half member 2 into the fitting receiving recesses 7 and 7 of the half member 1, the half members 1 and 2 are combined to form a roller body. I am trying to configure it.

  Further, what is described in Patent Literature 2 is substantially the same as the configuration of Patent Literature 1 described above, but further, shaft portions are provided at both longitudinal ends of one half member, and the other half member is provided. An example in which no shaft portion is provided at both ends is also described. In addition, what was described in Patent Document 2 is also a combination of two halved members in the same manner as in Patent Document 1 described above.

JP-A-9-179408 Japanese Patent No. 3061361

  However, according to the above-mentioned Patent Document 1, when the two halved members 1 and 2 are fitted, the halved member 1 is fitted to one of the halved members 1 in order to be fitted from the direction intersecting the roller axis (radial direction). On the other hand, it is necessary to bend the other half member 2, and there is a problem that the fitting work becomes complicated. There is also a problem that it is difficult to fit the two halved members 1 and 2 with high accuracy. That is, it is difficult to accurately match the distance between the two fitting receiving recesses 7 and 7 of one half member 1 and the distance between the two fitting protrusions 9 and 9 of the other half member 2. It is. For example, when the distance between the latter fitting projections 9 and 9 is too short with respect to the former fitting receiving recesses 7 and 7, axial play is generated in the halved members 1 and 2 after fitting. On the other hand, when the distance between the latter fitting projections 9 is too long, the half member 2 after fitting is curved at the center in the longitudinal direction.

  The problem of the magnet roller of Patent Document 1 as described above is also the problem of Patent Document 2 described above.

  Further, the magnet rollers described in these Patent Documents 1 and 2 also have a problem that the magnetic force pattern formed around the rollers cannot be easily changed.

  Accordingly, an object of the present invention is to provide a magnet roller that is easy to fit two semi-cylindrical members and has high fitting accuracy. Another object of the present invention is to provide a magnet roller in which the magnetic pole pattern around the roller can be changed relatively easily in the split magnet roller.

  The invention according to claim 1 is a magnet roller that forms a magnetic pattern around a roller and processes a charged substance based on the magnetic pattern, and has an annular portion at one end and a shaft portion at the other end. Two semi-cylindrical members having one of the semi-cylindrical members, and inserting the shaft portion of one of the semi-cylindrical members into the annular portion of the other semi-cylindrical member. A cylindrical roller main body is configured.

  According to a second aspect of the present invention, in the magnet roller according to the first aspect, the inner diameter of the annular portion is set to be substantially the same as the outer diameter of the shaft portion, and the outer diameter is equal to the outer diameter of the roller body. It is set to be almost the same.

  According to a third aspect of the present invention, in the magnet roller according to the first aspect, the inner diameter of the annular portion is set to be substantially the same as the outer diameter of the shaft portion, and the outer diameter is larger than the outer diameter of the roller body. Is set to be small and enters the inside of the roller body.

  The invention according to claim 4 is the magnet roller according to any one of claims 1 to 3, further comprising a magnetic force adjusting member attached to the roller body along a roller axis to change the magnetic force pattern. The roller body has a mounting portion for positioning and fixing the magnetic force adjusting member.

  The invention according to claim 5 is the magnet roller according to any one of claims 1 to 4, wherein the magnetic force adjusting member is formed of a magnet body.

  According to a sixth aspect of the present invention, in the magnet roller according to any one of the first to fourth aspects, the magnetic force adjusting member is formed of a magnetic material.

  The invention according to claim 7 is the magnet roller according to any one of claims 1 to 6, wherein the attachment portion is a groove formed on the outer peripheral surface of the roller body along the roller shaft. It is characterized by that.

  According to an eighth aspect of the present invention, in the magnet roller according to any one of the first to sixth aspects, the mounting portion is a groove portion formed on the inner peripheral surface of the roller body along the roller shaft. It is characterized by that.

  The invention according to claim 9 is the magnet roller according to any one of claims 1 to 6, wherein the mounting portion is a through hole formed in the roller body along the roller shaft. Features.

  The invention according to claim 10 is the magnet roller according to any one of claims 1 to 9, wherein at least a part of the outer peripheral surface of the roller body is covered with a heat-shrinkable film. It is characterized by.

  According to the invention of claim 1, a cylindrical roller body having a shaft portion at each of both end portions is configured by inserting the shaft portion of one semicylindrical member into the annular portion of the other semicylindrical member. Therefore, for example, unlike the case where both semi-cylindrical members are fitted from the direction intersecting the roller shaft (see the background art), the shaft portion is moved in the direction along the roller shaft with respect to the annular portion. Since it can be inserted, the fitting work is simplified. Further, in the structure, in a roller body configured by combining two semi-cylindrical members, one semi-cylindrical member does not rattle or bend with respect to the other semi-cylindrical member. .

  According to the invention of claim 2, since the outer diameter of the annular portion is set to be substantially the same as the outer diameter of the roller body, when forming a magnet roller having a relatively small outer diameter, the annular portion is formed larger. Sufficient strength can be ensured.

  According to the invention of claim 3, since the outer diameter of the annular portion is set smaller than the outer diameter of the roller main body and enters the inside of the roller main body, there is a gap between the outer peripheral surface of the roller main body and the outer peripheral surface of the annular portion. Can be prevented from being formed.

  According to the fourth aspect of the present invention, since the magnetic force adjusting member can be positioned and fixed by the mounting portion of the roller main body, the magnetic force pattern formed around the roller can be changed by the positioning solid magnetic force adjusting member. . For example, a magnetic body or a magnetic body can be used as the magnetic force adjusting member, and by attaching these to the roller body, it is relatively easy to form a magnetic pattern that is difficult to achieve with the roller body alone. Can do.

  According to the invention of claim 5, since the magnetic force adjusting member is formed of a magnet body and the magnetic force adjusting member itself can generate a magnetic force, the roller body is made of a material other than the magnet body, for example, a magnetic body, a synthetic resin. It can be made of a material such as ceramic.

  According to the sixth aspect of the present invention, the magnetic force adjusting member is made of a magnetic material and cannot be generated by the magnetic force adjusting member itself. In this case, the roller body needs to be made of a magnetic material. However, the choice of material for the magnetic force adjusting member itself is greatly improved. In this case, as a material of the magnetic force adjusting member, in principle, any magnetic body (for example, any metal) can be used.

  According to the seventh aspect of the present invention, since the hollow portion inside the roller body is an open magnetic field, the magnetic force adjusting member is attached to the groove formed on the outer peripheral surface of the roller body to The formed magnetic force pattern can be appropriately controlled. Furthermore, since the attachment portion is a groove portion formed on the outer peripheral surface of the roller body, it is easy to attach the magnetic force adjusting member to the roller body.

  According to the eighth aspect of the present invention, since the hollow portion inside the roller main body is an open magnetic field, the magnetic force adjusting member is attached to the groove formed on the inner peripheral surface of the roller main body, thereby It is possible to appropriately control the magnetic force pattern formed on the substrate. Further, since the attachment portion is a groove portion formed on the inner peripheral surface of the roller body, no gap or step due to the attachment of the magnetic force adjusting member is not formed on the outer peripheral surface of the roller body. Further, since the roller body is configured by combining two semi-cylindrical members, for example, before combining two semi-cylindrical members, it is possible to attach a magnetic force adjusting member to the groove portion of the inner peripheral surface. And, compared with the case where the roller body is integrally formed of a cylindrical member, the attaching operation of the magnetic force adjusting member is facilitated.

  According to the ninth aspect of the invention, since the hollow portion inside the roller main body is an open magnetic field, the roller main body is attached with a magnetic force adjusting member in a through hole formed along the roller axis. The magnetic force pattern formed around the main body can be appropriately controlled. Furthermore, since the attachment portion is a groove portion formed by a through hole, a gap or a step due to attachment of the magnetic force adjusting member is not formed on the inner peripheral surface or the outer peripheral surface of the roller body.

  Regarding the groove portion of the outer peripheral surface of the above-mentioned claim 7, the groove portion of the inner peripheral surface of the eighth embodiment, and the through-hole of the ninth embodiment, the roller body of the present invention is configured by combining two semi-cylindrical members. For example, when a part of a groove or a through hole is formed in one semi-cylindrical member and the rest is formed in the other semi-cylindrical member, and two semi-cylindrical members are combined, It is possible to configure the entire groove and through hole. As a result, the shape of the mold when the semi-cylindrical member is molded (for example, when injection molding) can be simplified, or the molding operation can be facilitated. In addition, the cross-sectional shape of the groove and the through-hole, that is, the shape of the vertical cross section in the direction orthogonal to the roller axis (direction orthogonal to the longitudinal direction) can be complicated. For this reason, by making the cross-sectional shape of a groove part and a through-hole appropriate, the attachment operation | work of a magnetic force adjustment member can be made easy, or the attachment precision of a magnetic force adjustment member can be improved.

  According to the invention of claim 10, a cylindrical roller body formed by combining two semi-cylindrical members is covered with a heat-shrinkable film, so that the two semi-cylindrical members after the combination are relative to each other. It is possible to prevent displacement and eliminate a gap formed on the mating surfaces of the two.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, what attached | subjected the same code | symbol in each drawing shall perform the same structure or effect | action, and the duplication description about these shall be abbreviate | omitted suitably.

<Embodiment 1>
FIG. 1 is a perspective view of a magnet roller to which the present invention can be applied, as viewed obliquely from above.

As shown in the figure, the entire magnet roller includes a cylindrical roller portion 2, the longitudinal direction of the roller portion 2: projecting outwardly respectively from both ends (in the direction along the roller axis C ₀ hereinafter) It is comprised by the roller main body 1 provided with the shaft parts 3 and 4 which were made. These rollers 2, and the shaft portions 3 and 4 are configured concentrically with respect to the roller axis C _0.

  In the present embodiment, the magnet roller and the roller body 1 are the same. An example in which the magnet roller includes a magnetic force adjusting member separately from the roller body will be described later.

  FIG. 2 is an exploded perspective view of the roller body 1 described above. As shown in FIG. 1 and FIG. 1, the roller body 1 is configured by combining two semicylindrical members 10 and 20.

  In the following description, the case where the two semi-cylindrical members 10 and 20 have the same shape will be described as an example. However, when it is necessary to particularly distinguish between the two semi-cylindrical members 10 and 20, The semi-cylindrical member 20 of FIG.

As shown in FIGS. 1 and 2, one semi-cylindrical member 10 includes an elongated semi-cylindrical half part 11 and a longitudinal direction of the half part 11 (along the roller axis C ₀ in FIG. 1). The annular portion 12 provided at one end portion in the direction) and the shaft portion 13 provided at the other end portion are integrally formed. The half portion 11 has a substantially semicircular cross section in a direction perpendicular to the longitudinal direction. A slide guide 11c is formed on at least a portion of the inner peripheral surface 11a of the half portion 11 that is continuous with the inner peripheral surface 12a of the annular portion 12. The inner diameter of the slide guide 11 c is set to be substantially the same as the inner diameter of the inner peripheral surface 12 a of the annular portion 12 and the outer diameter of the outer peripheral surface 13 a of the shaft portion 13. The length of the slide guide 11 c in the longitudinal direction is set to be longer than at least the length of the shaft portion 13. This is for use as a guide for the shaft portion when the half members 10 and 20 are combined, as will be described in detail later. Two parallel long mating surfaces 11d and 11d are formed in the opening of the half portion 11 in a strip shape.

  The annular part 12 is formed integrally with the half part 11 at one end of the half part 11 as described above. The annular portion 12 has an inner diameter of the inner peripheral surface 12 a set to be substantially the same as the inner diameter of the slide guide 11 c of the inner peripheral surface 11 a of the half portion 11 and the outer diameter of the outer peripheral surface 13 a of the shaft portion 13. Yes. In the present embodiment, the outer diameter of the outer peripheral surface 12 b of the annular portion 12 is set to be the same as the outer diameter of the outer peripheral surface 11 b of the half portion 11. That is, after the combination of the semi-cylindrical members 10 and 20, the outer peripheral surface 12 b of the annular portion 12 constitutes the outer peripheral surface of the roller portion 2 together with the outer peripheral surface 11 b of the half-split portion 11.

  The shaft portion 13 is integrally formed with the other end portion of the half portion 11 as described above. The outer diameter of the outer peripheral surface 13a of the shaft portion 13 is set to be substantially the same as that of the slide guide 11c on the inner peripheral surface 11a of the half portion 11 described above. The shaft portion 13 is formed so that the proximal end side protrudes from the end portion and the distal end side protrudes from the end portion with respect to the end portion of the half portion 11. This tip-side protruding portion is inserted into the annular portion 22 of the other semi-cylindrical member 20. A chamfer 13c is provided at the tip of the shaft portion 13 to facilitate the insertion operation.

  In the present embodiment, the other semi-cylindrical member 20 is also formed in the same shape with respect to the one semi-cylindrical member 10 having the above-described configuration.

  That is, the other cylindrical member 20 includes an elongated semi-cylindrical half portion 21, an annular portion 22 provided at one end thereof, and a shaft portion 23 provided at the other end. ing. The half-split portion 21 has a slide guide 21c that is continuous with the inner peripheral surface 22a of the annular portion 22 at a part of the inner peripheral surface 21a. The inner diameter of the slide guide 21 c is set to be substantially the same as the inner diameter of the inner peripheral surface 22 a of the annular portion 22 and the outer diameter of the outer peripheral surface 23 a of the shaft portion 23. In addition, the outer diameter of the outer peripheral surface 22 b of the annular portion 22 is set to be the same as the outer diameter of the outer peripheral surface 21 b of the half portion 21. 2 indicates a mating surface to be mated with the mating surfaces 11d and 11d of the above-described one half portion 11, and 23c is a chamfer at the tip of the shaft portion 23.

  The roller body 1 of the present embodiment is configured by combining the above-described one semicylindrical member 10 and the other semicylindrical member 20 as follows.

  First, as shown to Fig.3 (a), one semi-cylindrical member 10 and the other semi-cylindrical member 20 are arrange | positioned in parallel some distance apart. At this time, the mating surfaces 11d and 11d and the mating surfaces 21d and 21d are oriented with the mating surfaces 11d and 11d of one semicylindrical member 10 facing upward and the mating surface 21d of the other semicylindrical member 20 facing downward. To face each other. Further, at this time, with respect to the longitudinal positions of the respective semicylindrical members 10 and 20, the slide guide 11 c of the half split portion 11 of one semicylindrical member 10 and the shaft portion of the other semicylindrical member 20. 23, and the slide guide 21c of the half portion 21 of the other semi-cylindrical member 20 and the shaft portion 13 of the other semi-cylindrical member 10 are substantially coincident with each other. In this state, the semi-cylindrical members 10, 20 are brought close to each other in the direction intersecting the longitudinal direction (the arrow direction in FIG. 3A), and as shown in FIG. And the mating surfaces 21d and 21d are brought into contact with each other. Thus, the shaft portion 23 of the other semi-cylindrical member 20 is attached to the slide guide 11c of one semi-cylindrical member 10, and the shaft of the one semi-cylindrical member 10 is attached to the slide guide 21c of the other semi-cylindrical member 20. Part 13 just fits. (B) shows a state where the two semi-cylindrical members 10 and 20 are positioned in the direction intersecting the longitudinal direction. However, at this stage, the two semi-cylindrical members 10 and 20 have not been positioned in the longitudinal direction yet.

  Subsequently, as described above, the two semicylindrical members 10 and 20 are maintained in a state in which the mating surfaces 11d and 11d and the mating surfaces 21d and 21d are in contact with each other, as shown in FIG. Move relative to the arrow direction shown. At this time, the shaft portion 22 of the other semi-cylindrical member 20 is along the slide guide 11c of the one semi-cylindrical member 10, and the shaft portion 13 of the one semi-cylindrical member 10 is the other semi-cylindrical shape. The member 20 smoothly moves in the longitudinal direction along the slide guide 21c. Furthermore, the outer diameters of the outer peripheral surfaces 13a and 23a of the shaft portions 13 and 23 of the semicylindrical members 10 and 20 are the inner diameters of the slide guides 11c and 21c, and the inner peripheral surfaces 12a and 22a of the annular portions 12 and 13, respectively. Therefore, the shaft portion 13 of one semi-cylindrical member 10 is connected to the annular portion 22 of the other semi-cylindrical member 20 and the shaft portion of the other semi-cylindrical member 20. 23 can be easily inserted into the annular portion 12 of one semi-cylindrical member 10, respectively. This insertion operation is performed until one cannot move relative to the other. Thereby, the roller main body 1 shown in FIG. 1 can be comprised.

  Thus, in the present embodiment, first, the semi-cylindrical members 10 and 20 are moved in a direction perpendicular to the longitudinal direction with the longitudinal position shifted by a length corresponding to the shaft portions 13 and 23. Then, the respective mating surfaces 11d, 11d and the mating surfaces 21d, 21d are aligned, and then slid in the longitudinal direction, whereby the respective shaft portions 13, 23 are inserted into the respective annular portions 22, 12, 2 The roller body 1 can be configured by combining the semi-cylindrical members 10 and 20. Since the operation | work which makes these both semi-cylindrical members 10 and 20 unnecessarily curve is not accompanied at the time of a combination, a combination operation | work becomes easy. Further, it is possible to perform a combination work with higher accuracy without play in the longitudinal direction and the direction orthogonal thereto. Further, according to the present embodiment, the outer diameters of the outer peripheral surfaces 12b and 22b of the respective annular portions 12 and 22 are set to be the same as the outer diameters of the outer peripheral surfaces 11b and 21b of the halved portions 11 and 21, that is, set to the maximum. Therefore, the strength of the annular portions 12 and 22 can be sufficiently secured even when a relatively thin magnet roller is formed.

  The semi-cylindrical members 10 and 20 in the present embodiment can be constituted by, for example, injection molded resin magnets. FIG. 4 shows an example of the magnetic pole. FIG. 1 shows a cross-sectional view taken along line XX in FIG. 1, that is, a longitudinal sectional view in a direction orthogonal to the longitudinal direction of the roller body 1. As shown in the figure, one semi-cylindrical member 10 is provided with magnetic poles N1 and S1, and the other semi-cylindrical member 20 is provided with magnetic poles N2 and S2. In the roller body 1 as a whole, four magnetic poles, that is, magnetic poles N1, S1, N1, and N2, are arranged so that the roller portion 2 is equally divided into four in the circumferential direction. The magnetic poles N1, S1, N2, and S2 formed along the circumferential direction are substantially the same at any position in the longitudinal direction.

  By the way, as described above, when the semicylindrical members 10 and 20 are injection-molded, the semicylindrical members 10 and 20 are warped. For example, in the posture shown in FIG. 3A, the lower semi-cylindrical member 10 is curved in the longitudinal center, and the upper semi-cylindrical member 20 is similarly curved in the longitudinal center. Will do. Even when such warpage occurs due to injection molding, the roller main body 1 is configured by combining the semicylindrical members 10 and 20 with the above-described configuration, whereby the warpage of both the semicylindrical members 10 and 20 can be prevented. The roller body 1 can be configured in a corrected state.

  In the above description, the case where one semi-cylindrical member 10 and the other semi-cylindrical member 20 have the same shape has been described as an example, but it is not necessarily the same. For example, you may comprise so that the length of the axial part 13 and the axial part 23 may differ as needed.

<Embodiment 2>
FIG. 5 is a perspective view of the magnet roller (roller body 5) according to the present embodiment as viewed obliquely from above. In the magnet roller shown in the figure, the magnet roller and the roller body 5 are the same as in the first embodiment. FIG. 6 is an exploded perspective view of the roller body 5. FIG. 7 is a view of the semicylindrical member 40 as viewed from the direction of the arrow Y in FIG. FIG. 8 is a view of the roller body 6 viewed from the direction of the arrow Z in FIG.

  In the present embodiment, one semi-cylindrical member 30 and the other semi-cylindrical member 40 are combined to form a roller body 5 including a roller portion 6 and shaft portions 7 and 8. In the present embodiment, the semi-cylindrical members 30 and 40 are formed of, for example, resin magnets.

  In the present embodiment, one semi-cylindrical member 30 includes a half portion 31, an annular portion 32 provided at one end thereof, and a shaft provided at the other end via a flange portion 34. The part 33 is integrally formed. The other semi-cylindrical member 40 includes a half portion 41, an annular portion 42 provided at one end thereof, and a shaft portion 43 provided at the other end via a flange portion 44. Is formed.

  In the present embodiment, the outer diameters of the outer peripheral surfaces 32 a and 42 a of the annular portions 32 and 42 are set smaller than the outer diameters of the outer peripheral surfaces 31 a and 41 a of the half-split portions 31 and 41. And the groove parts 45 and 35 in which these are fitted are formed in the base end part of the axial parts 43 and 33 inserted in these annular parts 32 and 42. As shown in FIG. That is, the flange portion 44 provided at one end portion of the other semi-cylindrical member 40 is disposed slightly inside the end portion of the half-split portion 41, and the half-split portion from the center of the flange portion 44 is arranged. A shaft portion 43 that is thinner than the inner diameter of the inner peripheral surface of 41 is projected. Therefore, at the base end portion of the shaft portion 43, the center of the shaft portion 43 is located between the outer peripheral surface 43a, the inner peripheral surface 41b of the half portion 41, and the outer end surface 44a of the flange portion 44. A semi-annular groove 45 having a quadrangular cross-sectional shape (a shape viewed from the direction of the arrow Y) when cut by a plane passing therethrough is formed. When the roller body 5 is configured by combining the two semicylindrical members 30 and 40 in substantially the same manner as in the first embodiment, the annular portion 32 of one semicylindrical member 30 is The other semi-cylindrical member 40 is fitted into the groove 45, and similarly, the annular portion 42 of the other semi-cylindrical member 40 is fitted into the groove 35 of the other semi-cylindrical member 30. It will be.

  According to the present embodiment, in addition to the effects of the first embodiment described above, when the roller body 5 is configured by further combining two semi-cylindrical members 30, 40, the outer peripheral surfaces of the annular portions 32, 42 32 a and 42 a are not exposed on the outer peripheral surface of the roller body 5. That is, it is possible to effectively prevent a gap due to exposure of the outer peripheral surfaces 32 a and 42 a of the annular portions 32 and 42 from being formed on the outer peripheral surface of the roller body 5.

<Embodiment 3>
In the present embodiment, a case will be described in which the magnet roller is composed of a roller body and a magnetic force adjusting member. In this case, the roller body is the roller body exemplified in the first and second embodiments, that is, two half parts having an annular part at one end and a shaft part at the other end. A cylindrical roller body having a cylindrical member and having the shaft portion at each end is inserted by inserting the shaft portion of one semi-cylindrical member into the annular portion of the other semi-cylindrical member. Any configuration other than those in the first and second embodiments may be used. Below, the case where the roller main body 9 is comprised combining the semi-cylindrical member 50 and the semi-cylindrical member 60 is demonstrated to an example.

9, the roller body 9, the substantially central portion in the longitudinal direction, the disconnection cross-section in a direction perpendicular to the roller axis C ₀ is a view schematically showing. In the figure, magnetic force adjusting members a to g (shown by hatching in FIG. 9) and attachment portions A to G for positioning and fixing the magnetic force adjusting members a to g are shown. However, the magnetic force adjusting members a to g and the attachment portions A to G are illustrated in one drawing in various modifications, and in practice, any one of them can be applied to one roller body. One of the above-mentioned types, a plurality of the same type (same shape), or a combination of a plurality of types (atypical) are appropriately provided.

The attachment portions A to G and the magnetic force adjusting members a to g are formed long along the roller axis C ₀ of the roller body 9 and are formed over almost the entire length of the roller portion of the roller body 9. Here, the meaning of the substantially full length means that when the annular portion is provided as described above, the portion corresponding to the annular portion is excluded, and the outer peripheral surface of the roller body 9 as in mounting portions B and E described later. When it is formed so as to penetrate 9a and the inner peripheral surface 9b, it means that it is not formed in the vicinity of both ends in the longitudinal direction of the roller portion.

The attachment portions A and C are groove portions formed on the outer peripheral surface 9a of the roller body 9, and are formed by bottom surfaces A1 and C1 on the arc and side surfaces A2, A3, C2 and C3, respectively. In the figure, the bottom surfaces A1 and C1 are formed in an arc shape, but may be formed in a planar shape. The side surfaces A2, A3, C2, C3 is extended to the inside is formed in the direction through the roller shaft C _0, instead of this, connecting the circumferential direction of the center and the roller shaft C ₀ linear (For example, you may make it form in parallel with the dashed-dotted line H in the same figure). The magnetic force adjusting member a attached to the attachment portion A is formed so that the entirety thereof is just fitted to the attachment portion A. That is, the magnetic force adjusting member a is formed in the same shape as the attachment portion A, and the outer side surface a 1 thereof coincides with the outer peripheral surface 9 a of the roller body 9. On the other hand, the magnetic force adjusting member c fitted to the attachment portion C is formed so that the inner portion thereof is fitted to the attachment portion C and the outer portion c1 protrudes from the outer peripheral surface 9a. Yes.

The attachment portions D and F are groove portions formed on the inner peripheral surface 9b of the roller body 9, and are formed by bottom surfaces D1 and F1 on the circular arc and side surfaces D2, D3, F2 and F3, respectively. In the figure, the bottom surfaces D1 and F1 are formed in an arc shape, but may be formed in a planar shape. The side surfaces D2, D3, F2, F3 is extended to the inside is formed in the direction through the roller shaft C _0, instead of this, connecting the circumferential direction of the center and the roller shaft C ₀ linear (For example, you may make it form in parallel with the dashed-dotted line H in the same figure). As described above, when formed in parallel, the magnetic force adjusting members d and f can be fitted from the inner peripheral surface 9 b side of the roller body 9. In addition, when fitting from the inner peripheral surface 9b side, it will fit before combining a semicylindrical member. The magnetic force adjusting member f attached to the attachment portion F is formed so that the entirety thereof is just fitted to the attachment portion F. That is, the magnetic force adjusting member f is formed in the same shape as the mounting portion F, and the inner side surface f 1 thereof coincides with the inner peripheral surface 9 b of the roller body 9. On the other hand, the magnetic force adjusting member d fitted to the attachment portion D is formed so that the outer portion thereof is fitted to the attachment portion D and the inner portion d1 protrudes from the inner peripheral surface 9b. ing.

The attachment portions B and E are groove portions formed so as to penetrate the roller body 9 through the outer peripheral surface 9a side and the inner peripheral surface 9b side, and side surfaces B1, B2, E1, E2 along the longitudinal direction, respectively. And a side surface (not shown) at both ends in the longitudinal direction. Longitudinal side of these sides B1, B2, E1, E2, the extension of the inside is passed along the roller axis C _0. The magnetic force adjusting members b and e fitted to the mounting portions B and E have a sector shape as shown in the cross section in the direction orthogonal to the longitudinal direction. Among these, in the state in which the magnetic force adjusting member b is fitted to the attachment portion B, the outer portion b1 protrudes from the outer peripheral surface 9a of the roller body 9, and the inner portion b2 protrudes from the inner peripheral surface 9b. ing. On the other hand, in the magnetic force adjusting member e, the outer surface e1 coincides with the outer peripheral surface 9a, and the inner portion e2 protrudes from the inner peripheral surface 9b.

  The attachment portion G is a through hole formed in the roller body 9 along the roller axis S. For example, a rod-shaped magnetic force adjusting member g is fitted to the attachment portion G.

  As for the method of fitting the magnetic force adjusting members a to g to the mounting portions A to G, the magnetic force adjusting members a, b, c and e are from the outer peripheral surface 9a side, and the magnetic force adjusting members d, f and g are attached. The roller body 9 is inserted from the end in the longitudinal direction. However, as described above, when the side surfaces D2 and D3 of the attachment portion D are formed in parallel and the side surfaces F2 and F3 of the attachment portion F are formed in parallel, the fitting from the inner peripheral surface 9b side becomes possible. .

  In the above description, the case where the attachment portions A to G are all formed on one or the other of the semi-cylindrical members has been described as an example, but instead of this, a part of the attachment portion is formed in one semi-cylindrical shape. It is also possible to form on the mating surface of the member and form the remaining part of the mounting portion on the mating surface of the other semi-cylindrical member so that the mounting portion is completed when the mating surfaces are combined. . In particular, in the case of forming the attachment portion G consisting of the through holes in FIG. 9, if the semi-cylindrical recesses are formed on the respective mating surfaces, the attachment portion G consisting of the through holes is configured when these are combined. can do. With such a configuration, injection molding becomes easy.

  When the above-described roller body 9 is formed of a magnet body, both the magnet body and the magnetic body can be used as the magnetic force adjusting member. One of the above-described attachment portions A to G or a plurality of the same attachment portions A or a combination thereof is appropriately formed at a predetermined position of the roller body 9. Corresponding magnetic force adjusting members are attached to the attachment portions formed in this way. That is, the magnetic force adjusting member is positioned in the circumferential direction of the roller main body 9 only by being fitted to the mounting portion. At this time, the magnetic pattern formed around the roller body 9 can be simplified by fitting a magnetic body to the formed mounting portion or fitting a magnetic force adjusting member having an appropriate magnitude of magnetic force. Can be changed.

  That is, for example, when the roller body 9 is configured by combining two semi-cylindrical members made of resin magnets formed by injection molding, the roller body 9 is magnetized at the time of injection molding. It is difficult to change the magnetic force pattern every time.

  In such a case, a mounting portion is formed on the roller body 9 during injection molding. For example, a magnetic force adjusting member having an appropriate magnetic force is attached to the attachment portion. Accordingly, by attaching a magnetic force adjusting member to the roller main body 9 with respect to the magnetic force pattern formed around the roller body 9 alone, the magnetic force pattern can be appropriately changed, and a complicated magnetic force pattern can be obtained. It becomes possible to form.

  Here, in the present invention, the roller body is configured by combining two semi-cylindrical members. In particular, a mounting portion is provided on the inner peripheral surface, and magnetic force adjustment is performed on this mounting portion before combining. This is effective when attaching a member. In this case, since the magnetic force adjusting member is not exposed to the outer peripheral surface side, the smoothness of the outer peripheral surface of the roller body can be maintained.

<Embodiment 4>
In the present embodiment, the outer peripheral surface of the roller body is covered with a heat-shrinkable film.

  When the magnet roller is composed only of the roller body, after the roller body is constructed by combining two semi-cylindrical members, and when the magnet roller is composed of the roller body and the magnetic force adjusting member. After the magnetic force adjusting member is combined with the roller body, the surface of the roller body is covered with, for example, a tube-shaped heat-shrinkable film, and then the heat-shrinkable film is contracted by heating to adhere to the surface of the roller body. Thereby, unnecessary movement of the two semi-cylindrical members after the roller main body is configured can be prevented, thereby preventing the displacement and improving the smoothness of the surface of the magnet roller. Further, when the magnetic force adjusting member is fitted from the outer peripheral surface side of the roller main body, the magnetic force adjusting member can be prevented from falling off by covering the heat shrinkable film.

  In the above embodiment, the case where the roller body is formed of a resin magnet has been described as an example. However, the present invention is not limited to this. For example, the roller body is formed of a general ferrite magnet. It can also be applied to.

  In the above description, the case where the magnetic force adjusting member is fitted and attached to the roller main body has been described as an example. However, the roller main body may be bonded using an adhesive.

  Next, an example in which the magnetic pole pattern around the roller is changed by the magnet roller according to the present invention will be described with reference to FIGS. The magnetic force pattern is a magnetic force pattern formed on the outer periphery of the roller by magnetic pole analysis.

  Each of the magnet rollers shown in FIGS. 10 to 13 is formed by stacking semi-cylindrical members in the vertical direction on the joint surfaces Ra and Rb, respectively, and the graphs showing the results of the magnetic pole analysis in each figure are horizontal The axis takes an angular position (°) measured counterclockwise with respect to one joining surface Ra of the magnet roller, and the vertical axis takes the surface magnetic flux density (G: Gauss).

  FIG. 10 shows, for comparison, an analysis result of a magnet roller to which the present invention is not applied and its magnetic force pattern. In the magnet roller shown in the figure, five magnetic poles are arranged in the order of magnetic poles S1, S2, N1, S3, and N2 counterclockwise. According to this magnet roller, a magnetic force pattern as shown in the graph of FIG.

  The magnet roller shown in FIG. 11 has a yoke (ferromagnetic material) h1 attached as a magnetic force adjusting member between the magnetic pole S1 and the magnetic pole S2 with respect to the magnet roller shown in FIG. A yoke h2 is similarly attached to the peripheral side as a magnetic adjustment member. According to the magnet roller of FIG. 11, the reversal pole N3 is formed by the yoke h1, and the magnetic poles S3 and N2 are raised by the yoke h2.

  The magnet roller shown in FIG. 12 has an S pole magnet body h3 having a stronger magnetic force than the magnetic pole S1 and the magnetic pole S2 as a magnetic force adjusting member between the magnetic pole S1 and the magnetic pole S2 with respect to the magnet roller shown in FIG. Is. According to the magnet roller shown in the figure, the magnetic forces of the magnetic poles S1 and S2 are reduced, and a magnetic pole S4 having a stronger magnetic force is formed between the magnetic poles S1 and S2.

  The magnet roller shown in FIG. 13 has an N-pole magnet body h4 having a stronger magnetic force than the magnetic pole S1 and the magnetic pole S2 as a magnetic force adjusting member between the magnetic pole S1 and the magnetic pole S2, with respect to the magnet roller shown in FIG. Is. According to the magnet roller in the figure, the magnetic forces of the magnetic pole S1 and the magnetic pole S2 increase, and a magnetic pole N3 is formed between the magnetic pole S1 and the magnetic pole S2. According to the magnet roller of FIG. 13, the magnetic poles S1, S2, S3 having substantially the same magnetic force and the magnetic poles N1, N2, N3 having substantially the same magnetic force can be formed.

  Thus, according to the present invention, a desired magnetic force pattern can be obtained relatively easily by attaching the magnetic force adjusting member.

FIG. 2 is a perspective view showing an overall configuration of a roller body according to the first embodiment. 3 is an exploded perspective view of a roller body according to Embodiment 1. FIG. In Embodiment 1, it is a figure explaining the operation | movement which comprises a roller main body combining two semi-cylindrical members. FIG. 2 is an XX line view of FIG. 1. FIG. 6 is a perspective view illustrating an overall configuration of a roller body according to a second embodiment. 6 is an exploded perspective view of a roller body according to Embodiment 2. FIG. FIG. 7 is a view on arrow Y in FIG. 6. FIG. 6 is a view taken in the direction of arrow Z in FIG. It is a figure explaining the shape and position of various attachment parts and a magnetic force adjustment member. It is a figure which shows the magnet roller to which this invention is not applied, and its magnetic force pattern. It is a figure which shows the magnet roller which attached two magnetic bodies as a magnetic force adjustment member, and its magnetic force pattern. It is a figure which shows the magnet roller which attached the magnet body of the S pole as a magnetic force adjustment member, and its magnetic force pattern. It is a figure which shows the magnet roller which attached the magnet body of N pole as a magnetic force adjustment member, and its magnetic force pattern.

Explanation of symbols

1,5 Roller body 2, 6 Roller part 3, 4, 7, 8, 13, 23, 33, 43
Shaft part 10, 20, 30, 40, 50, 60
Semi-cylindrical members 12, 22, 32, 42
Annular parts A to G Mounting parts a to g Magnetic force adjusting member

Claims (10)

In the magnet roller that forms a magnetic pattern around the roller and processes the charged substance based on the magnetic pattern,
Two semi-cylindrical members having an annular portion at one end and a shaft portion at the other end,
A cylindrical roller body having the shaft portion at each of both end portions is configured by inserting the shaft portion of one of the semicylindrical members into the annular portion of the other semicylindrical member.
A magnet roller characterized by that. The annular portion has an inner diameter set to be substantially the same as the outer diameter of the shaft portion, and the outer diameter is set to be substantially the same as the outer diameter of the roller body.
The magnet roller according to claim 1. The annular portion has an inner diameter set to be substantially the same as the outer diameter of the shaft portion, the outer diameter is set smaller than the outer diameter of the roller body, and enters the inner side of the roller body.
The magnet roller according to claim 1. A magnetic force adjusting member attached to the roller body along a roller axis to change the magnetic force pattern;
The roller body has an attachment portion for positioning and fixing the magnetic force adjusting member.
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller. The magnetic force adjusting member is formed of a magnet body;
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller. The magnetic force adjusting member is formed of a magnetic material;
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller. The mounting portion is a groove formed along the roller shaft on the outer peripheral surface of the roller body.
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller. The mounting portion is a groove formed along the roller shaft on the inner peripheral surface of the roller body.
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller. The mounting portion is a through hole formed in the roller body along the roller axis;
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller. The roller body has at least a part of the outer peripheral surface covered with a heat-shrinkable film,
The magnet roller according to claim 1, wherein the magnet roller is a magnetic roller.

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