JP3784549B2 - Magnetic seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic seal structure used in equipment using fine toner or the like. In this specification, an unmagnetized magnet material (main body) before magnetization is also referred to as a magnet.
[0002]
[Prior art]
A cartridge 80 including a magnet roll that magnetizes fine carbon toner and uses it for printing is used in printers of various electronic devices and OA devices.
In the cartridge 80, as shown in FIG. 7A, a toner 82 is disposed in the center of a cartridge case 81, and a magnet roll (not shown) is rotatably supported so as to be in contact with the toner 82. The rotating shafts J at both ends of the magnet roll are magnetically sealed close to the magnetic sealing material 84 disposed on the upper side of each side wall 83 at both ends of the case 81 as shown in the figure.
[0003]
That is, the magnetic sealing material 84 includes a semicircular portion 86 that is multipolarly magnetized so that the inner peripheral surface 85 alternately has N / S different polarities along the longitudinal direction, and a linear portion 88 that extends horizontally from one end thereof. It consists of. The top surface of the straight portion 88 is also multipolarly magnetized in the same manner as described above.
Therefore, even if the toner 82 tries to leak to the outside through a gap of only about 0.5 mm between the rotating shaft J and the magnetic seal material 84, the magnetized toner 82 is on the inner peripheral surface 85 of the semicircular portion 86 or a straight portion. It is magnetically attracted to the opposite magnetic pole portion on the upper surface of 88.
[0004]
However, a slight gap may be formed between the upper side of each side wall 83 of the cartridge 80 and the lower surface of the magnetic seal material 84. This gap is mainly formed by an error in molding accuracy of both the side wall 83 and the magnetic seal material 84.
In order to eliminate a gap between the lower surface of the magnetic sealing material 84 and the upper side of each side wall 83, a so-called double-sided tape 90 is provided along the lower surfaces 87 and 89 of the semicircular portion 86 and the straight portion 88 as shown in FIG. And a sponge-like elongate sealing piece 92 is bonded to the entire lower surface of the magnetic sealing material 84 through the tape 90.
[0005]
[Problems to be Solved by the Invention]
However, sticking the tape 90 over the entire bottom surface of the elongated magnetic seal material 84 and manually bonding the elongated seal piece 92 to each other requires man-hours and labor, increases costs, and increases the cost. There was a problem that the characteristics were likely to vary.
It is an object of the present invention to provide a magnetic seal structure that solves the problems in the prior art described above, reduces man-hours and labor, and can obtain a highly stable seal characteristic.
[0006]
[Means for Solving the Problems]
The present invention for solving the above problems, subjected to multipolar magnetization to be different poles alternately on both surfaces of the magnets arranged along the surface to be sealed, near surface between both rotary Jiku及 beauty cases And the idea of magnetically sealing the contact surface.
That is, the magnetic seal structure according to the present invention (Claim 1) is a magnetic seal structure in which a magnetic seal material is disposed between each of the rotating shaft and the cartridge case via a gap, and the magnetic seal material is substantially constant. fixation of the magnet body integrally molded exhibits且one arcuate has a rectangular cross-section, in any aspect other than the inner and outer peripheral surfaces of the magnet body according, to cover substantially the entire of the side The magnet body is magnetized on the inner circumferential surface and the outer circumferential surface that are parallel to each other, have different polarities in the thickness direction of the magnet body, and each of the circumferential surfaces of the body. It is characterized in that magnetic pole portions magnetized so as to have different polarities alternately along the longitudinal direction are formed .
[0007]
According to this, magnetized toner and the like are attracted to different poles and prevented from leaking by the magnetic fluxes formed by the gaps between the rotating shaft and the cartridge case side that are close to or in contact with each pair of parallel surfaces. At the same time, since the magnetic flux from each magnetic pole is focused on the yoke plate, the toner or the like can be reliably sealed.
Further, the present invention, the magnet body of the magnetic seal member is one having a shape integrally having straight linear in its outward radially on at least one end of the arc-shaped, magnetic seal structure (claim 2) Is also included.
According to this, for example, in a cartridge such as a printer, toner leakage is prevented from the gap between the rotating shaft of the magnet roll that magnetizes the internal toner and one magnetized surface, and the other adhering that is close to the cartridge case. prevent toner leakage from the gap between the case side adjacent with the magnetic seal member in磁表surface, and also sealing at the linear near the rotational axis can be ensured.
[0008]
Further, the present invention, the longitudinal magnetic pole portion magnetized to be different poles alternate along the each circumferential surface of the magnet body in the magnetic seal member along the longitudinal direction of the side faces inclined A magnetic seal structure (claim 3) is also included.
According to this, even when the toner magnetized with the rotation of the rotating shaft of the magnet roll tries to move outside from the gap with the magnetized surface of the magnetic seal material, it is more easily attracted to any of the different polar parts. Therefore, the leakage can be surely prevented.
[0009]
The present invention also includes a magnetic seal structure (claim 4) in which the cartridge case has a recess for arranging the magnetic seal material through the gap .
As a result, toner and the like are attracted to the magnetic poles on the other magnetized surface of the magnet body, so that it is possible to prevent toner leakage from the recessed portion of the cartridge case that is in surface contact with the gap .
[0010]
Furthermore, the present invention includes a magnetic seal structure in which a soft magnetic support material is fixed to the surface of the recess portion of the cartridge case (Claim 5) .
According to this, since the soft magnetic support material is magnetized by the magnetic flux passing between the other magnetized surface of the magnet and the opposite concave portion, the toner is formed in the gap between the magnetic seal material and the concave portion of the cartridge. Therefore, it is possible to realize a more reliable magnetic seal and prevent the toner from leaking.
[0011]
The magnet is made of a mixture of an iron-rare earth element (for example, neodymium Nd) -boron alloy powder by a rapid quenching method and a resin binder . For this reason , even in a magnetic seal material arranged in a narrow space, it is possible to achieve a reliable magnetic seal in a gap with the rotating shaft or the like based on its high magnetic characteristics. In addition, you may use not only the said resin magnet but a sintered magnet and a cast magnet.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the following, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1A shows a perspective view of one form of the magnetic seal material 1 used in the magnetic seal structure of the present invention.
The magnetic seal material 1 includes a magnet body 2 integrally having a linear shape 6 extending radially outward at one end of an arc shape 4 and a yoke plate 10 having a substantially similar shape fixed to the outer surface thereof. In the illustration of the magnet body 2, the inner peripheral surface on the depth side and the outer peripheral surface on the near side are a pair of surfaces parallel to each other, and as shown in FIG. And magnetic pole portions that are magnetized so as to have different N and S polarities along the respective longitudinal directions. The magnet body 2 is obtained by injection-molding a mixture of a powder of a rare earth element-boron alloy such as iron-Nd and a resin binder by a rapid quenching method using a magnetizing yoke described later. It is magnetized like this.
[0013]
The yoke plate 10 is a thin plate made of a soft magnetic material such as soft iron or nickel, and has an arc portion 12 that substantially covers the entire outer surface of the arc shape 4 of the magnet body 2 and an outer surface of the linear shape 6. And a straight portion 18 covering about half. A plurality of shallow recesses 14 are formed on the outer peripheral surface side along the longitudinal direction of the arc portion 12 and the straight portion 18, and a plurality of through holes 16 are formed inside. As shown in FIG. 1B, a part of the magnet body 2 also enters the recesses 14 and the through holes 16.
[0014]
FIG. 1C shows a magnetic seal structure of the present invention using such a magnetic seal material 1, and a soft magnetic support material 24 is fixed to the surface of a recess 22 formed on the upper side of a cartridge case 20 of a printer or the like. is doing. The support member 24 integrally has a rounded portion 26 and a straight portion 28, and the upper surface thereof has a shape that follows the outer peripheral surface of the magnetic seal material 1. Therefore, the magnetic seal material 1 is set on the rounded portion 26 and the straight portion 28 of the support member 24 as shown in the figure. Further, the rotation axis J of the magnet roll R is inserted on the inner peripheral surface of the arcuate shape 4 of the magnet body 2 in the magnetic seal material 1.
A bearing (not shown) of the rotary shaft J is disposed near the outside of the magnetic seal material 1. A lid (not shown) is covered on the cartridge case 20.
[0015]
As a result, as shown in FIG. 2A, a cap of about 0.5 mm is formed between the rotating shaft J of the roller R and the inner peripheral surface of the arc shape 4 of the magnet 2 in the magnetic seal material 1. Is done. Further, a gap of about 0.1 to 0.3 mm is formed between the outer peripheral surface of the arc shape 4 and the support member 24 on the case 20 according to the molding accuracy of both.
By the way, the toner magnetized by the magnet roll R in the cartridge case 20 is used for predetermined printing, but a part of the toner enters the gaps and tends to leak out of the case 20. Each N / S magnetic pole on the inner peripheral surface of the arc 4 of the magnet 2 forms a continuous corrugated magnetic flux with the rotation axis J of the roller R adjacent along the longitudinal direction, and on the outer surface. A part of the magnetic flux is focused on the yoke plate 10.
Therefore, the magnetized toner that has entered the cap of the magnet body 2 and the rotation axis J is induced by the magnetic flux and has a different polarity on the inner circumferential surface of the arc shape 4 or the surface of the rotation axis J. Is adsorbed by the N · S magnetic pole portion.
[0016]
On the other hand, the NS magnetic poles on the outer peripheral surfaces of the circular arc shape 4 and the linear shape 6 of the magnet 2 form a continuous corrugated magnetic flux with the support member 24 adjacent in the longitudinal direction, and A part of the magnetic flux is focused on the side yoke plate 10. Accordingly, the magnetized toner that has entered the cap of the magnet body 2 and the support member 24 is also induced by the magnetic flux and has a different N / S magnetic pole on either the outer peripheral surface of the magnet 2 or the upper surface of the support member 24. To be adsorbed. Moreover, since the magnetic flux is focused on the yoke plate 10 near the outside of each gap, the toner does not leak to the outside of the case 20 and fills in each gap. As a result, by interposing a magnetic seal member 1 between the rotation axis J and the cartridge case 20 can be occupied reliably perform magnetic seal in accordance position.
[0017]
2B to 2D relate to a reference form of the yoke plate 10.
The yoke plate 10 shown in FIG. 2 (B) has an extending portion 13 in which an illustrated arc portion 12 and a straight portion 18 (not shown) are extended along the outer peripheral surface side (left side in the drawing) of the magnet body 2. . As shown in the figure, the extending portion 13 closes a gap between the outer peripheral surface of the magnet body 2 and the recess 22 on the upper side of the case 20, and a portion near the tip thereof is in surface contact with the outer surface of the case 20. Therefore, the extending portion 13 prevents the toner from leaking from the inside of the case 20 and forms and focuses a magnetic flux with each of the N and S magnetic poles on the outer peripheral surface side of the magnet 20. It is also possible to adsorb to these different poles. If the support member 24 is fixedly used in the recess 22 of the case 20, the sealing characteristics are further improved.
[0018]
The arc portion 12 (straight portion 18) of the yoke plate 10 shown in FIG. 2C also has an extending portion 13 along the outer peripheral surface side of the magnet body 2, but the tip thereof is bent at a right angle and the magnet body 2 It has the parallel part 17 extended in parallel with an outer peripheral surface. The lower surface of the parallel portion 17 has a shape that follows the recess 22 of the case 20. The parallel portion 17 forms a corrugated magnetic flux between the N and S poles on the outer peripheral surface side of the magnet body 2. In addition, a part of the magnetic flux is focused through the extending portion 13. Therefore, the support member 24 can be omitted, and toner leakage from the cap of the magnetic seal material 1 and the case 20 can be reliably prevented.
[0019]
Further, the arc portion 12 (straight portion 18) of the yoke plate 10 shown in FIG. 2D also has the extending portion 13 and the parallel portion 17, and the parallel portion 17 extends at right angles from the middle of the extending portion 13. I am letting. Near the tip of the extension 13, a tip (lower end) portion 19 that is in surface contact with the outer surface of the case 20 is located. According to this, the magnetic flux is formed and converged in the parallel portion 17 and the extending portion 13 as well as the above, and the toner leakage from the case 20 can also be prevented by the tip portion 19. In this case, the parallel portion 17 does not necessarily have a shape that follows the recess 22 of the case 20, and the connection with the extending portion 13 can be performed by laser welding, brazing, or the like.
[0020]
Figure 3 relates to a process for the preparation of the magnetic seal member 1.
3 (A) is shown the yoke plate 10 described above, a plurality of shallow recesses 14 on the outer edge of the arcuate portion 12 and straight portion 18, the convex portion 15 is formed therebetween.
First, as shown in FIG. 3B, the yoke plate 10 is inserted into the bottom of the cavity 34 between the split dies 32 and 33 of the mold 30. The cavity 34 has a similar shape following the magnet body 2, and an injection hole 36 is suspended from the upper surface thereof. Then, as indicated by the arrows in the figure, a magnet material made of a mixture of the alloy powder and the resin binder is injected into the cavity 34 and filled. At this time, the yoke plate 10 is pressed to the left side in the cavity 34 in the drawing by the respective recesses 14.
[0021]
Then, opening the split mold 32, 33 of the mold 30, FIG. 3 (C), the respective to indicate out-inner surface (c), the arc-shaped and integrally fixed to the yoke plate 10 on its outer surface magnet body 2 consisting of 4 and linear 6 which is obtained. Part of the magnet material also enters each recess 14 of the yoke plate 10, and the yoke plate 10 in the cavity 34 is set at a predetermined position during the injection molding, thereby preventing the burr from being attached to the magnet 2. It is out. In addition, a part of the magnet material also enters each through hole 16 of the yoke plate 10, and the adhesion between the yoke plate 10 and the magnet body 2 is strengthened.
Further, as shown in FIGS. 3D and 3E, with respect to the inner and outer peripheral surfaces of the magnet body 2, N / S different polarities are formed in the thickness direction, and NS different polarities are alternately arranged along the longitudinal direction. Thus, the magnetic sealing material 1 is obtained by performing the magnetization described below.
[0022]
FIGS. 4A and 4B show the magnetized state of the magnet body 2 with respect to the arc shape 4 and the linear shape 6. As shown in FIGS. 4A and 4C, the magnetizing yoke 40 that magnetizes the inner and outer peripheral surfaces of the circular arc shape 4 has a pair of parallel curves along the inner and outer peripheral surfaces of the circular arc shape 4. The yoke main bodies 41, 42, a plurality of round grooves 43, 44 formed perpendicularly to the inner surface of the yoke main bodies 41, 42, and the adjacent round grooves 43 inserted into the respective round grooves 43, 44 through these narrow openings. Or a coil (copper wire) C passing through the circular grooves 44 in a zigzag manner. The yoke bodies 41 and 42 are made by cutting pure iron, a yoke made of carbon steel for mechanical structure (JIS: S10C, S15C), or an Fe—Ni permalloy alloy.
[0023]
4B, the magnetized yoke 45 that magnetizes the inner and outer peripheral surfaces of the linear shape 6 also includes a pair of linear yoke bodies 46 parallel to the inner and outer peripheral surfaces of the linear shape 6. 47 and a plurality of round grooves 48 and 49 formed perpendicularly to the inner surface of each of the round grooves 48 and 49, and the round grooves 48 and 49 which are inserted into the round grooves 48 and 49 through these narrow openings and are adjacent to each other, or the round grooves 49 It consists of a coil C that passes between each other in a zigzag manner.
Next, magnetization of the linear shape 6 will be described by taking the magnetizing yoke 45 as an example. As shown in FIG. 4 (D), the straight line 6 is inserted between the yoke bodies 46 and 47 so that a direct current flows through each coil C. In this case, the two coils C are wound in opposite directions or are energized in opposite directions by winding in the same direction.
[0024]
Then, by energizing each coil C, based on Fleming's law, the magnetic flux passes through the straight portion 6 as indicated by the arrow in the figure in a zigzag manner in the left-right direction. By maintaining this state for a required time, N poles or S poles are alternately magnetized on each surface of the magnet body 2 (linear shape 6) through which the magnetic flux has passed. Note that the arc-shaped magnet 4 is also magnetized at the same time or separately by the same operation using the magnetized yoke 40.
As a result, as shown in FIG. 4E, the inner and outer peripheral surfaces of the circular arc shape 4 and the linear shape 6 become NS magnetically saturated different polarities in the thickness direction, and each peripheral surface. Thus, a magnet 2 having magnetic pole portions alternately having N and S different poles along the longitudinal direction is obtained.
This magnetizing operation is performed after the magnet body 2 is fixed to the yoke plate 10, but only the magnet body 2 may be magnetized first alone as shown in FIG. It is also possible to magnetize at once using a single magnetizing yoke in which the magnetizing yokes 40 and 45 are integrated.
[0025]
FIG. 5A shows a modification 40 ′ of the magnetized yoke 40. The yoke 40 'includes a pair of parallel bent yoke bodies 41' and 42 ', a plurality of round grooves 43' and 44 'formed obliquely on the inner surface of the yoke body 40', and each round opening from these narrow openings. The coil C is inserted into the grooves 43 ′ and 44 ′ and passes through the adjacent circular grooves 43 ′ or between the circular grooves 44 ′ in a zigzag manner with inclination. Similarly, by using together a magnetized yoke 45 '(not shown) in which the circular grooves 48 and 49 are inclined, as shown in FIG. A magnet 2 'can be obtained in which N and S poles that are inclined with respect to each other along the longitudinal direction are alternately magnetized on the outer peripheral surface. When this magnet 2 ′ is used for the magnetic seal material 1, it is possible to more reliably prevent toner leakage with the rotary shaft J of the roll R.
[0026]
FIG. 5C shows a magnet 52 in which N and S poles are magnetized along the longitudinal direction on the inner and outer peripheral surfaces of a magnet body 52 of a reference form having a ring shape. In order to obtain the magnet body 52, a mixture of the alloy powder and the resin binder is filled in a ring-shaped cavity (not shown) and injection molded. Further, in order to perform the above magnetization, each yoke body 41, 42 of the magnetized yoke 40 is formed in a concentric ring shape, a magnet body 52 is inserted between them, and each coil C is energized in the same manner as described above. .
Also, the magnet 62 of the reference embodiment exhibiting an arc shape shown in FIG. 5 (D) providing a magnet body 62 of the same shape, obtained by magnetizing and by using the magnetization yoke 40.
Further, the reference magnet 72 having a linear shape shown in FIG. 5 (E) is obtained by magnetizing the magnet body 72 having the same shape using the magnetizing yoke 45.
[0027]
Figure 6 relates to a magnetic seal member references form using the magnet 52, 62, 72.
FIG. 6A shows a magnetic seal material 50 having the same shape and a thin yoke plate 54 fixed to one side surface (outer surface) of the magnet 52. According to the sealing material 50, the rotation shaft J of the roll R can be passed through, and the outer peripheral surface can also be magnetically sealed between the case 20 and its lid. Further, as shown in the cross-sectional view of FIG. 6B, a magnetic sealing material 50a integrally including a circular extending portion 55 in which the yoke plate 54 is radially extended around the magnet 52 can be used. . Thereby, even the outer peripheral surface of the magnet 52 can be reliably magnetically sealed between the case 20 and its lid.
The magnetic seal materials 50 and 50a are preferably used in combination with the support material 24. Further, the fixation with the yoke plate 54 can be performed even before the magnet body 52 is magnetized, and if the through hole 16 is formed in the yoke plate 54, a strong fixation can be obtained.
[0028]
Further, as shown in the cross-sectional view of FIG. 6C, all parallel portions 56 parallel to the magnetized surface (N / S pole) of the magnet 52 are perpendicular to the tip of the extending portion 55 provided on the yoke plate 54. It can also be set as the magnetic sealing material 50b provided along the periphery. In addition, as shown in FIG. 6 (D), a parallel portion 56 parallel to the magnetized surface of the magnet 52 is provided at a right angle from the middle of the extending portion 55, and the extending portion 55 has a tip portion 58. It is also possible to use the sealing material 50c. According to these magnetic sealing materials 50b and 50c, the same magnetic sealing effect as that mounted on the case 20 similar to that shown in FIGS. 2C and 2D can be obtained.
[0029]
FIG. 6E shows a magnetic seal material 60 in which a yoke plate 64 having the same shape is fixed to one side surface (outer surface) of the magnet 62. According to this sealing material 60, the rotating shaft J of the roll R is supported via the cap, and magnetic sealing can be performed at each gap between the rotating shaft J and the case 20. Further, as shown in FIG. 6 (F), a magnetic seal material 60 'integrally having an arc-shaped extending portion 66 in which the yoke plate 64 is radially extended on the outer peripheral surface side of the magnet 62 is used. You can also. Further, as shown in FIG. 6 (G), a magnet provided with a parallel portion 68 parallel to the magnetized surface (N · S pole) of the magnet 62 at a right angle from the tip of the extending portion 66 provided on the yoke plate 64. It is also possible to use the sealing material 60 ″. It is also possible to adopt a form in which the parallel portion 68 is provided from the middle of the extending portion 66. These magnetic sealing materials 60 ′ and 60 ″ can also be used for the rotating shaft. A magnetic seal of the gap between both J and case 20 can be achieved.
[0030]
FIG. 6H shows a magnetic seal material 70 having the same shape and a thin yoke plate 74 fixed to one side surface (outer side surface) of the magnet 72. According to the sealing material 70, for example, magnetic sealing can be performed in a linear gap between the case 20 and the lid. Further, as shown in FIG. 6 (I), a magnetic seal material 70 ′ integrally including a rectangular extending portion 76 in which the yoke plate 74 is extended to one peripheral surface side of the magnet 72 can be used. . Further, as shown in FIG. 6 (J), a magnetic portion provided with a parallel portion 78 parallel to the magnetized surface (N / S pole) of the magnet 72 at a right angle from the tip of the extending portion 76 provided on the yoke plate 74. It is also possible to use the sealing material 70 ″. It is also possible to adopt a form in which the parallel portion 78 is provided from the middle of the extending portion 76. With these, magnetic sealing can be reliably performed in the linear gap. It becomes possible.
[0031]
The present invention is not limited to the embodiments described above.
For example, yaw click plate, said or punched by a press of the soft magnetic sheet metal, further bent in order to obtain the parallel portion machining, welding, or brazed addition to or, be formed into final shape by precision casting Is also possible.
Further, as the material of the magnet (main body), it is possible to use samarium-cobalt alloy powder, or a resin having excellent heat resistance such as polyamide or PPS as the resin binder, in addition to the above-described form.
The magnetic seal structure of the present invention can be applied not only to printers and copiers that use fine powders such as toner, but also to various devices that require dust resistance.
[0032]
【The invention's effect】
According to the magnetic seal structure of the present invention described above, a pair of parallel circumferential surfaces in the arc- shaped magnet body having a rectangular cross section have different polarities in the thickness direction and alternately warp in the longitudinal direction of each circumferential surface. Since a magnetic seal material having a magnetic pole portion magnetized so as to have a different polarity and having a yoke plate fixed to the side surface thereof is used, the gap between the peripheral surface of the magnet body , the rotating shafts of various rolls, and the cartridge Magnetic sealing becomes possible and the magnetic flux is concentrated on the yoke plate, so that leakage of toner or the like can be reliably prevented.
In addition, according to the magnetic seal structure of the second aspect, the magnetic seal can be more satisfactorily performed in the cap in the portion adjacent to the rotating shaft of various rolls.
Further, according to the magnetic seal structure of the third and fourth aspects, even if the toner magnetized by the rotation of the rotating shaft of the magnet roll tries to come out from the gap with the magnetized surface of the magnetic seal material, any difference is caused. Since it becomes easier to be adsorbed to the pole portion, the leakage can be reliably prevented .
In addition, according to the magnetic seal structure of the fifth aspect, since the soft magnetic support material is fixed to the case side even in the gap between the magnetic seal material and the cartridge case to which the magnetic seal material is mounted, the magnetic seal is more surely secured. It becomes possible to do.
[Brief description of the drawings]
1 (A) is a perspective view showing a magnetic sealing member used in the present invention, (B) is sectional view taken along line B-B in (A), (C) the magnetic of the present invention using the magnetic seal member Schematic which shows a seal structure .
2A is a cross-sectional view taken along line aa in FIG. 1C, and FIGS. 2B to 2D are partial cross-sectional views illustrating a reference embodiment.
FIGS. 3A to 3D are schematic views showing manufacturing steps of the magnetic seal material of FIG. 1, and FIG. 3E is a cross-sectional view taken along line EE in FIG.
FIGS. 4A to 4D are schematic views showing a magnetizing step of the magnetic seal material of FIG. 1 on a magnet body or a magnetizing yoke used in these processes, and FIG. 4E is a perspective view of a magnetized magnet. .
5A is a perspective view showing different magnetized yokes, FIG. 5B is a perspective view of magnets magnetized thereby, and FIGS. 5C to 5E show magnetized magnets of the reference form. FIG.
6 (A) ~ (J) FIG 5 (C) ~ a schematic view showing a magnetic sealing member reference mode using the magnets (E).
7A is a sectional view of a cartridge using a conventional magnetic seal material, and FIG. 7B is a side view of the conventional magnetic seal material.
[Explanation of symbols]
1 ……………… Magnetic seal material 2,2 ′ ………… Magnet body / Magnet 4 ……………… Arc shape 6 ……………… Linear shape 10 …………… Yoke plate
20 …………… Cartridge Case
22 …………… Dent
24 …………… Support material N ……………… Magnetic pole (magnetic pole part)
S ……………… Magnet (Magnetic part)

Claims (5)

A magnetic seal structure in which a magnetic seal material is disposed between each of the rotation shaft and the cartridge case via a gap ,
It said magnetic seal member comprises a magnet body integrally molded exhibits且one arcuate has a substantially constant rectangular cross-section, in any aspect other than the inner and outer peripheral surfaces of the magnet body according this aspect And a soft magnetic yoke plate fixed so as to cover substantially the whole of
The magnet body is magnetized on inner and outer peripheral surfaces parallel to each other, and has different polarities in the thickness direction of the magnet main body, and alternately has different polarities along the longitudinal direction of each peripheral surface of the main body. The magnetic pole part magnetized in this way is formed ,
Magnetic seal structure characterized by that. The magnet body of magnetic seal member is one having a shape integrally having straight linear in its outward radially on at least one end of the arc-shaped,
The magnetic seal structure according to claim 1. Longitudinal pole portion magnetized to be different poles alternate along the each circumferential surface of the magnet body in the magnetic seal member, characterized in that is inclined along the longitudinal direction of the side faces The magnetic sealing material according to claim 1 or 2. The cartridge case has a recess for arranging the magnetic sealing material through the gap .
The magnetic seal structure according to claim 1, wherein the magnetic seal structure is a magnetic seal structure . A soft magnetic support material is fixed to the surface of the recess of the cartridge case .
The magnetic seal structure according to claim 4.

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