JPH0573660U - Magnet roll - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a magnet roll that is easy to assemble because the weight can be reduced even if it has a large diameter and a long length. A non-magnetic permanent magnet member formed of a hollow cylinder and provided with a plurality of magnetic poles extending in the axial direction on the outer peripheral surface thereof, and a shaft provided so as to coaxially penetrate through the permanent magnet member. In a magnet roll integrally fixed through a support member made of a material, the shaft is made of a non-magnetic material, and the support member formed in a ring shape is press-fitted into the shaft portion facing the end of the permanent magnet member. Stick to it. Also, a plurality of permanent magnet members are connected in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnet roll used as a developing roll in electrophotography, electrostatic recording and the like.

[0002]

[Prior Art]

 Many magnet rolls used for developing rolls in conventional electrophotography and electrostatic recording have a structure as shown in FIG. In FIG. 4, reference numeral 1 is a permanent magnet member, which is integrally molded into a cylindrical shape by using a sintered powder magnet material such as hard ferrite, or a cylindrical shape using a mixture of fine particles of a ferromagnetic material and a binder. , The shaft 2 is coaxially fixed to the central portion.

A plurality of magnetic poles (not shown) extending in the axial direction are provided on the outer peripheral surface of the permanent magnet member 1. Next, flanges 3 and 4 are rotatably attached to both ends of the shaft 2 through bearings 5 and 5, and a hollow cylindrical sleeve 6 is fitted to the flanges 3 and 4. The flanges 3 and 4 and the sleeve 6 are formed of a non-magnetic material such as an aluminum alloy or stainless steel. A seal member 7 is fitted between the flange 3 and the shaft 2. The permanent magnet member 1 often has a diameter of 15 to 60 mm and a length of 200 to 350 mm. With the above structure, the relative rotation between the permanent magnet member 1 and the sleeve 6 (for example, fixing the permanent magnet member 1 and rotating the flange 4) causes the magnetic developer to be attracted to the outer peripheral surface of the sleeve 6. The magnetic brush is formed and the prescribed development work is performed.

[0004]

[Problems to be solved by the device]

 Among the magnet rolls having the above-mentioned construction, in copying large-scale drawings, there is a permanent magnet member 1 having a diameter of 30 mm or more and a length of more than 1 m. In such a case, since the weight of the permanent magnet member 1 and the shaft 2 becomes large, various proposals for reducing the weight have been made (for example, Japanese Utility Model Publication No. 52-79938 and Japanese Patent Publication No. 54-12744). No. 56-140380, etc.).

FIG. 5 is a vertical sectional view showing an improved example of the conventional magnet roll, and FIG. 6 is a sectional view taken along the line BB in FIG. In FIGS. 5 and 6, reference numeral 11 denotes a shaft member, and the outer cylinder 12, the inner cylinder 13 and the arm 14 are integrally formed by, for example, an aluminum drawing material. Then, the support shafts 15 are inserted into both ends of the inner cylinder 13 and fixed by the pins 16. The permanent magnet member 1 is formed in a hollow cylindrical shape, and is fixed to the outer cylinder 12 forming the shaft member 11 with an adhesive, for example. When forming a long magnet roll, a plurality of permanent magnet members 1 (two in Fig. 5) are connected in the axial direction.

With the above structure, it is possible to manufacture a magnet roll having a large diameter such as 60 mm and an axial length dimension of 1 m or more, but there are the following problems. .

First, the shaft member 11 is formed of a light metal such as aluminum or a light alloy, but since it is formed over the entire length in the axial direction of the magnet roll, the weight becomes large and therefore the weight of the entire magnet roll is increased. It will be an increasing factor. For this reason, there is a problem in that the driving torque becomes large and the entire device becomes large.

Next, when fixing the support shafts 15 to both ends of the shaft member 11, it is necessary to ensure the coaxiality between the shaft member 11 and the support shafts 15. Therefore, a dedicated assembly jig is used. There is a need. Further, since the gap between the outer peripheral surface of the outer cylinder 12 constituting the shaft member 11 and the inner peripheral surface of the permanent magnet member 1 is usually 0.5 mm or less, the work of fitting the permanent magnet member 1 into the shaft member 11 is performed. Is complicated. Particularly in a magnet roll configured to connect a plurality of permanent magnet members 1 in the axial direction, the maximum distance for moving the permanent magnet members 1 in the axial direction of the shaft member 11 is the axial length of the shaft member 11. The problem is that the assembly work will be extremely complicated, as it will be halved.

The present invention solves the above-mentioned problems existing in the prior art, and provides a magnet roll that can reduce the weight even if it has a large diameter and a long length and that is easy to assemble. With the goal.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a permanent magnet member formed in a hollow cylindrical shape and provided with a plurality of magnetic poles extending in the axial direction on the outer peripheral surface, and the permanent magnet member is coaxially penetrated into the permanent magnet member. In a magnet roll integrally fixed to a shaft provided in this way through a support member made of a non-magnetic material, the shaft is made of a non-magnetic material, and the ring-shaped support member is a permanent magnet member. We adopted a technical means of press-fitting and fixing to the shaft part facing the end of the.

In the present invention, a plurality of permanent magnet members can be connected in the axial direction.

[0012]

[Action]

 With the above configuration, the axial dimension of the supporting member can be significantly reduced, so that the weight can be reduced, and the axial moving distance of the permanent magnet member in the assembling work can be shortened, which facilitates the assembling.

[0013]

【Example】

 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1, and the same portions are designated by the same reference numerals as those in FIGS. 1 and 2, reference numeral 21 denotes a support member, which is made of, for example, aluminum and is formed into a ring shape having a cross-sectional shape similar to that of the support shaft 15 shown in FIGS. That is, the outer ring 22, the inner ring 23 and the arm 24 are integrally formed. Then, the supporting member 21 is press-fitted and fixed to each portion of the shaft 2 facing the end of the permanent magnet member 1. The end portions of the permanent magnet members 1 are fixed to the outer peripheral surface of the outer ring 22 that constitutes the support member 21 with, for example, an adhesive. Numeral 25 is a retaining ring, which is fitted into a groove 26 formed near both ends of the shaft 2 and prevents the axial movement of the support member 21 press-fitted near both ends of the shaft 2.

With the above structure, since the shaft portion supporting the permanent magnet member 1 is only the shaft 2 and the supporting member 21, the weight can be significantly reduced as compared with those shown in FIGS. 5 and 6. It is easy to understand. Further, regarding the assembling work, after the support member 21 is press-fitted into the shaft 2 or every time the support member 21 is press-fitted, the permanent magnet member 1 is fitted around the outer ring 22 constituting the support member 21. However, in this case, since the axial dimension of the support member 21 is small, press-fitting of the support member 21 and fitting of the permanent magnet member 1 are extremely easy.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the present invention, in which the same parts are designated by the same reference numerals as those shown in FIGS. The support member 21 shown in FIG. 3 is formed of, for example, an aluminum alloy into a hollow disk shape, and is press-fitted in the vicinity of both ends of the shaft 2. Both ends of the permanent magnet member 1 are fixed to the outer peripheral surface of the support member 21 with, for example, an adhesive. Therefore, the same operational effects as those of the embodiment shown in FIGS. 1 and 2 can be obtained.

Although the shaft 2 and the supporting member 21 are made of an aluminum alloy in this embodiment, they may be made of another light metal material or a light alloy material. It may be made of a plastic material as long as it can be secured. Of course, the shaft 2 is not limited to a solid round bar and may be formed in a pipe shape.

[0017]

[Effect of the device]

 Since the present invention has the structure and operation as described above, the weight of the shaft portion can be greatly reduced, and therefore the weight can be reduced even if it has a large diameter and a long length. Further, since the assembling work becomes extremely easy, the cost can be reduced, and so on.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a partially omitted vertical sectional view showing an example of a conventional magnet roll.

FIG. 5 is a vertical sectional view showing an improved example of a conventional magnet roll.

6 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 1 Permanent magnet member 2 Shaft 21 Support member

Claims (2)

[Scope of utility model registration request] 1. A permanent magnet member formed in a hollow cylindrical shape and provided with a plurality of magnetic poles extending in the axial direction on the outer peripheral surface, and a shaft provided so as to coaxially penetrate through the permanent magnet member. In a magnet roll integrally fixed through a support member made of a non-magnetic material, the shaft is made of a non-magnetic material, and the shaft-shaped support member faces the end of the permanent magnet member. A magnet roll characterized by being press-fitted and fixed to. 2. The magnet roll according to claim 1, wherein a plurality of permanent magnet members are connected in the axial direction.