JP3061361B2 - Magnet roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrophotographic copying machine,
The present invention relates to a resin magnet roll (magnet roll) used for an image reproducing apparatus such as a facsimile, a printer, and the like.

[0002]

2. Description of the Related Art Conventionally, for example, in a dry type electrophotographic copying machine, a latent image formed on an electrophotosensitive member made of, for example, selenium is scanned by a rotating body made of a magnet roll to which toner is adsorbed. After being visualized, the image is transferred to paper. At that time, in order to obtain a good quality image with a uniform density, it is necessary that a necessary amount of toner adheres uniformly over the entire length of the entire rotating body composed of the magnet roll. There is a demand for a magnet roll having a uniform and high magnetic force over the entire length.

FIG. 5 shows a conventional length of about 300.
sectional view showing a sectional shape of a magnet roll of 1 mm, and
It is a perspective view . In FIG. 5, the magnet roll 1
A shaft (rotating shaft) 1a having a diameter of about 10 mm and this shaft
(Rotating shaft) A rotor portion 1b having a diameter of about 30 mm is formed on the outer peripheral portion of 1a to form a magnet roll as an anisotropic magnet. The magnet roll 1 is made by mixing magnetic powder such as ferrite powder at a uniform density with a resin made of nylon, epoxy, rubber or the like.

[0004] Then, the ferrite powder or the like and a magnetic powder uniformly be heated by mixing with the required density <br/> of the mold (not shown) heated to 50 to 100 ° C. in the resin Manufactured by injecting into the base. Further, the magnet roll 1
In order to form an anisotropic magnet, a plurality of permanent magnets are arranged around the resin when resin is injected, or a current is applied to a plurality of arranged coils and a magnetic field is applied by an electromagnet to form an anisotropic magnet. .

[0005] As described above, the conventional magnet roll 1 has the shaft portion 1a and the rotor portion 1b integrally formed. The shaft 1a is made of metal or the like, and a resin magnet is injection-molded thereon. Was either.

[0006]

In the above-mentioned conventional magnet roll, in the above case, a large amount of resin magnet material is required because the entire shaft portion and rotor portion are made of resin, resulting in high cost. There is a disadvantage that.

In the above case, when a resin magnet is injection-molded on a metal or the like serving as a shaft, both ends of the resin magnet are cooled and hardened earlier than the center, and thereafter the center is gradually hardened. Therefore, there is a disadvantage that the resin contracts when cooled and hardened, so that the resin is pulled at both ends of the central portion of the resin and cracks occur at the central portion.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and has a small number of assembling steps, is assembled by a simple method, is inexpensive, and has a stable structure without cracks at the center. It is an object of the present invention to provide a magnet roll having a predetermined shape.

In order to achieve the above object, the magnet roll of the present invention is divided into two parts according to the first aspect.
Ends formed by combining elongated, semi-cylindrical resin magnets
Magnet row consisting of a cylindrical rotating body with a shaft
Each of the two semi-cylindrical resin magnets
At one end, a shaft made of metal or resin is integrally molded
And each semi-cylindrical shape without a shaft at one end
At one end of the inner central portion of the resin magnet, a resin having the shaft portion
It is characterized by having a coupling part that is coupled by fitting with a magnet.
It is a magnet roll .

With the above configuration, the two resin magnets can be stably connected without using an adhesive.

According to a second aspect of the present invention, in the first aspect,
In the magnet roll, the one piece integrally molded at one end.
Provide a hole that penetrates the center of the shaft in the longitudinal direction.
One end of the inner central part of the resin magnet having no shaft at one end
A support at the center of the support.
By fitting the convex part of the
Magnet characterized by combining a cylindrical resin magnet
Roll .

With the above-described structure, the two resin magnets can be connected to each other at a central portion by a simple method.

According to a third aspect of the present invention, in the first aspect ,
In the magnet roll, set at both ends of one resin magnet
Both the convex or concave part of the gutter notch and the other resin magnet
Engage with the concave or convex part of the notch provided at the end
Characterized in that the magnets are combined by
Roll .

[0014] With the above configuration, a simple coupling state can be obtained only by fitting two resin magnets together.

[0015] Further, in claim 4, according to claim 1,
In the magnet roll, the length direction of one resin magnet
A support base with a convex or concave part is
In addition, the other resin magnet is recessed at multiple locations in the length direction.
A support base having a convex part or a convex part is provided, and one resin magnet
Are respectively fitted into the concave portions of the other resin magnet.
By combining, two resin magnets are joined
It is a featured magnet roll .

With the above-described configuration, the two resin magnets can be easily connected only by pushing the concave and convex portions of the two resin magnets together.

Still further, in claim 5 , two parts are provided.
Formed by combining cracked elongated semi-cylindrical resin magnets
Magnet consisting of a cylindrical rotating body with shafts at both ends
In the troll, the two semi-cylindrical resin magnets
At each end, attach a shaft made of metal or resin.
Body, and the circumference around both ends of two resin magnets
Grooves are provided on each of the upper portions, and annular portions engaged in these grooves are provided.
The two resin magnets can be joined by providing a material.
And a magnet roll characterized by the following.

With the above-described structure, the connection can be made by simply pushing the ring-shaped member into the groove without providing a support portion, a projection or a hole.

[0019]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

In FIG. 1, reference numerals 10a and 10b denote semi-cylindrical resin magnets constituting the magnet roll of the present invention, respectively, which are made of resin mixed with ferrite powder.

Numerals 11a and 11b (not shown) are shafts for rotating the magnet roll. As is clear from FIG. 1, 11a is formed integrally with one end of the resin magnet 10a.

The shafts 11a and 11b (not shown) are integrally molded at one end or both ends of the resin magnet 10a.
The other resin magnet 10b has a shaft 11a or 1 at one end thereof.
1b or the shaft is not provided at both ends. Therefore, the resin magnets 10a and 10a
It is also possible for b to have the opposite configuration to that of FIG.

The shafts 11a and 11b (not shown)
Holes 12a and 12b (not shown) are provided at the center of the resin magnet 10b having no shaft at the end, or a support base 13 is provided at one or both ends of the inner center of 10a.
a, 13b (not shown) are provided.
13b has a fitting projection 14a or 14b, respectively.
(Not shown) is provided.

In the configuration shown in FIG. 1, the resin magnets 10a and 10a
At the time of joining the resin magnet 10b, the support 13 of the resin magnet 10b is inserted into the hole 12a of the shaft 11a at one end of the resin magnet 10a.
The connection is made by fitting the projections 14a on the “a”.

When the other end (not shown) is connected, the resin magnet having no shaft is slightly bent so that the protrusion 1 is inserted into the hole 12b of the shaft 11b (not shown).
4b are joined by fitting.

FIG. 2 is a perspective view showing a second embodiment of the present invention.

In FIG. 2, reference numerals 20a and 20b denote semi-cylindrical resin magnets constituting the magnet roll of the present invention, respectively, which are made of resin mixed with ferrite powder.

Numerals 21a and 21b (not shown) are shafts for rotating the magnet roll. As is apparent from FIG. 2, 21a is formed integrally with one end of the resin magnet 20a.

The shafts 21a and 21b (not shown) are integrally molded at one end or both ends of the resin magnet 20a.
The other resin magnet 20b has a shaft 21a or 2 at one end thereof.
1b or the shaft is not provided at both ends. Therefore, the resin magnets 20a and 20a
It is also possible that b is the reverse configuration of FIG.

Then, in order to connect the resin magnets 20a and 20b, notches 22a and 23a having irregularities are provided at one side edge of the two resin magnets 20a and 20b. Notches 22b and 23b are also provided at the other side edge (both are not shown).
Is provided.

In the configuration shown in FIG. 2, the resin magnets 20a and 20a
0b, the convex portion of the notch 22a on one side edge of the resin magnets 20a, 20b is replaced with the concave portion of the notch 23a.
Similarly, the convex part of the notch 23a is fitted into the concave part of the notch 22a.

The notches 22b and 23b on the other side edges (not shown) of the resin magnets 20a and 20b are fitted in the same manner, so that the two resin magnets 20a and 20b are connected.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

In FIG. 3, reference numerals 30a and 30b denote semi-cylindrical resin magnets constituting the magnet roll of the present invention, respectively, which are made of resin mixed with ferrite powder.

Numerals 31a and 31b (not shown) are shafts for rotating the magnet roll. As is apparent from FIG. 3, 31a is formed integrally with one end of the resin magnet 30a.

The shafts 31a and 31b (not shown) are integrally formed at one end or both ends of the resin magnet 30a.
The other resin magnet 30b has a shaft 31a or 3 at one end.
1b or the shaft is not provided at both ends. Therefore, the resin magnets 30a and 30a
It is also possible that b is the reverse configuration from FIG.

Further, in order to connect the resin magnets 30a and 30b, a support base 32a is provided near one end of the resin magnet 30a having an axis 31a at one end, and one end of the resin magnet 30b having no axis is provided. A support 33a is provided in the vicinity of the support, a protrusion 34a is provided on the support 32a, and a recess 35 is provided on the support 33a.
a is provided. The projection 34a is opposite to the support base 33 in FIG.
a, and the recess 35a may be provided on the support 32a.

Further, supporting bases 32b and 33b (not shown) are provided near the other ends (not shown) of the resin magnets 30a and 30b in the same manner as those near the one end.
A protrusion 34b (not shown) or a recess 35b (not shown) is provided in each of b and 33b.

When connecting the two resin magnets 30a and 30b, one end is connected to the convex portion 34a and to the concave portion 35a.
The other end is connected by fitting a convex portion 34b (not shown) into a concave portion 35b (not shown).

In this embodiment, the support bases 32a and 32b having convex portions and the support bases 33a and 33 having concave portions are provided.
Although b is provided only near the ends of the two resin magnets 30a and 30b, it can be firmly connected by being provided not only near the ends of the resin magnets 30a and 30b but also at a plurality of locations in the longitudinal direction. . Further, as described above, the convex portions and the concave portions may be provided in reverse.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

In FIG. 4, reference numerals 40a and 40b denote semi-cylindrical resin magnets constituting the magnet roll of the present invention, respectively, which are made of resin mixed with ferrite powder.

Reference numerals 41a and 41b (not shown) are shafts for rotating the magnet roll. As is apparent from FIG. 4, 41a is formed integrally with one end of the resin magnet 40a.

Since the shafts 41a and 41b (not shown) are integrally formed at one end or both ends of the resin magnet 40a,
The other resin magnet 40b has a shaft 41a or 4 at one end thereof.
1b or the shaft is not provided at both ends. Therefore, the resin magnets 40a and 40a
It is also possible that b is the reverse configuration of FIG.

In the vicinity of one end of the resin magnets 40a, 40b, grooves 42a, 43a are provided on the circumference thereof. Although not shown, grooves 42b and 43b (not shown) are also provided near the other ends of the resin magnets 40a and 40b.

When the resin magnets 40a and 40b are combined to form a magnet roll, an annular piano wire or a spring-like piano wire is formed in grooves 42a and 43a formed on the circumference of one end. Fastening is performed using a ring 44a such as a ring or a rubber band.

Although not shown, the other end also has
A ring 44b (not shown) is engaged with grooves 42b and 43b (not shown) formed on the circumference to be fastened.

[0048]

As described above, according to the magnet roll of the present invention, two resin magnets whose shafts are integrally formed can be easily joined without using an adhesive or using a tool. In addition, the structure is simple and lightweight, and the manufacturing cost is extremely low.

According to the second aspect of the present invention, simple coupling can be performed only by forming a fitting member at the center of each of the two resins.

According to the third aspect of the present invention, since the coupling is performed by providing the notch on the side of the resin magnet, the structure is light and simple.

According to the fourth aspect of the present invention, since only the two resin magnets are provided with the concave and convex portions, the coupling is easy and the configuration is simple.

Further, according to the invention described in claim 5, 2
Grooves are provided near both ends of the two resin magnets, and the grooves are connected to each other by using a piano wire or a flexible member for fastening, so that the processing steps in manufacturing the resin magnets are extremely simple.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view and a perspective view showing a cross-sectional shape of a conventional magnet roll.

[Explanation of symbols]

10a, 10b, 20a, 20b, 30a, 30b, 4
0a, 40b Resin magnets 11a, 11b, 21a, 31a, 41a Shafts 12a Holes 13a, 32a, 33a Supports 14a, 34a Protrusions 22a, 23a Notches 42a, 43a Grooves

Claims (5)

(57) [Claims] 1. A magnet roll comprising a cylindrical rotating body having shaft portions at both ends formed by combining two elongated thin semi-cylindrical resin magnets, wherein said two semi-cylindrical resin magnets are provided. At one end of each, a shaft formed of metal or resin is integrally molded, and at the center of the inner center of each semi-cylindrical resin magnet having no shaft at one end .
A magnet roll provided at one end with a coupling portion that is coupled to the resin magnet having the shaft portion by fitting. 2. A magnet roll according to claim 1, a hole penetrating in the longitudinal direction of the central portion of the shaft portion integrally formed at one end is provided, further, the inner having no resin magnet shaft portion at one end A support base is provided at one end of the central part, a convex part is provided at the central part of the support base, and the two semi-cylindrical resin magnets are joined by fitting the convex part into the hole. And a magnet roll. 3. A magnet roll according to claim 1, and the convex portion or concave portion of the notch portions provided on both ends of one of the resin magnet, and a recess or protrusion of the notch portions provided on both ends of the other resin magnet A magnet roll characterized in that it is joined by engaging each other. 4. A magnet roll according to claim 1, a plurality of locations along the length of one resin magnet is provided with a support base having a convex portion or concave portion, further, other resin magnetic
A support base having a concave portion or a convex portion at a plurality of positions in the length direction of the stone is provided, and the convex portion of one resin magnet is fitted into the concave portion of the other resin magnet, whereby two resin magnets are formed. A magnet roll characterized by being combined. 5. A magnet roll comprising a cylindrical rotating body having shaft portions at both ends formed by combining two elongated semi-cylindrical resin magnets, wherein said two semi-cylindrical resin magnets are provided. At one end of each, a shaft portion made of metal or resin is integrally molded, and further, grooves are provided on the circumferences near both ends of the two resin magnets, and a ring-shaped member engaged in these grooves is formed. A magnet roll, wherein the two resin magnets are combined by providing them.