JP4071586B2 - Endless belt manufacturing method and composite rotating body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method of an endless belt used in a belt apparatus such as an electrophotographic copying machine, a facsimile machine, or a printer, and a composite rotating body used in manufacturing the endless belt.
[0002]
[Prior art]
Conventionally, seamless endless (seamless) belts are used in various belt devices. For example, in an image forming apparatus such as an electrophotographic copying machine, it is used as a transfer belt as a carrier for a toner image or a transfer material.
[0003]
As shown in FIG. 2, an endless belt manufacturing method applied to such an application includes, as shown in FIG. 2, a coating liquid 3 that is a resin or a precursor thereof as a material for an endless belt. The coating mold 1 is rotated at a high speed, the coating film thickness is made uniform on the inner surface of the release layer 2 by the centrifugal force, and then dried, solidified, cooled, and peeled off to obtain an endless belt. A molding method is known.
[0004]
This centrifugal molding method has the following excellent advantages as a method for producing an endless belt. 1) Adjustment of the film thickness can be arbitrarily adjusted by the amount of coating solution. 2) It is only necessary to apply the coating solution in a necessary amount, and the material utilization efficiency is good. 3) The inside of the outer mold is a closed space, and when removing the solvent, a solvent trap can be provided in the exhaust path to efficiently recover the solvent discharged to the outside.
[0005]
However, the difficulty of the endless belt manufacturing method by this centrifugal molding method is that the rotation cannot be stopped until the solvent after application is dried and no longer flows or dripping, and therefore the production efficiency is poor. That is.
[0006]
Therefore, in order to solve the problems of this centrifugal molding method, a rotating body is installed at the bottom of the coating mold (outer mold), and the rotating body (core type rotating body) is applied as the coating mold rotates. A method of manufacturing an endless belt has been proposed in which the production efficiency is increased by being driven to rotate at the bottom of the mold. (For example, see Patent Document 1)
[0007]
Further, as shown in FIG. 3, a centrifugal operation using a composite rotating body in which a plurality of core-type rotating bodies 5 that are driven to rotate as the outer mold 4 rotates is installed at the bottom of the rotating cylindrical outer mold 4. A molding method has been proposed. The two core type rotators 5 of the composite rotator shown in FIG. 3 remain in a balanced position near the bottom of the outer die 4 due to gravity and are in contact with each other. When the outer mold 4 rotates, the core rotor 5 rotates while sliding in the rotation direction of the outer mold 4, and the rotations at the contact surfaces of the adjacent core rotors 5 are opposite to each other. Direction. Therefore, when the slidability is good and the friction pressure is not applied, the rotation of each other can be maintained. However, when the rotation speed increases, the rotation speed of each other is reduced.
[0008]
[Patent Document 1]
JP 2000-127256 A (page 2-5, FIG. 1)
[0009]
[Problems to be solved by the invention]
By the way, in the centrifugal molding method using the composite rotating body configured as shown in FIG. 3, as the outer mold 4 rotates, a plurality of core-type rotating bodies 5 are caused by their own weight at the bottom of the outer mold 4. It rotates following to be rolled. At this time, as shown in FIG. 3 (a), the core-type rotating bodies 5 adjacent to each other rotate in the reverse direction (cross counter) where they contact each other. Therefore, when the slidability is good and no frictional pressure is applied, the rotation of each other can be maintained. However, when the number of rotations increases, the rotation speed of each other is reduced. If it is extreme, one of the core-type rotating bodies 5 is dragged by the rotation of the outer mold 4, moves to the top of the outer mold 4, falls, and collides with the other core-type rotating body 5 to be deformed. There was a problem. In addition, when the level is poor, there is a problem that the rotating holder and the core-type rotating body 5 collide with each other and collide with each other, causing scratches and eventually deforming.
[0010]
In order to prevent multiple core rotors from colliding with each other, there is a method of inserting an auxiliary core rotor with a small diameter in the gap between the core rotors. However, as long as the core-type rotors are in contact with each other, the driven rotation direction is the same with respect to the outer mold, so the rotation directions of the core-type rotors or the auxiliary core-type rotors are reverse rotations, If the dynamic friction coefficient and the number of revolutions are not finely adjusted, the number of revolutions may be reduced, and the number of revolutions required for smooth rotation and film formation of the coating solution may not be obtained.
[0011]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a plurality of core-type rotating bodies installed inside a rotating outer mold so that the rotational flutter and unevenness of the core-type rotating bodies can be reduced. It is an object of the present invention to provide an endless belt manufacturing method and a composite rotating body that can be rotated without causing any trouble and obtain a good coating film.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 provides a composite rotating body in which a plurality of core-type rotating bodies that are driven to rotate as the outer mold rotates are installed inside the rotating outer mold. In the endless belt manufacturing method using the centrifugal molding method used , a core-type rotating body provided with magnets polarized on the opposite sides of the front and back sides at the both ends or in the entire axial direction is used . It is characterized by preventing contact .
By the above method, the contact between the core-type rotating bodies is prevented by the repulsive action of magnetic force, and a good coating film is formed.
[0013]
According to a second aspect of the present invention, there is provided a composite rotating body in which a plurality of core-type rotating bodies that are driven to rotate in accordance with the rotation of the rotating body are installed inside the rotating outer mold. Magnets polarized in different directions on the front and back sides are provided in the entire axial direction, and the contact between the core-type rotating bodies is prevented by the repulsive action of magnetic force .
With the above configuration, the magnets of the core-type rotating body repel each other and become non-contact, and the core-type rotating body rotates well.
[0014]
According to a third aspect of the present invention, in the composite rotating body according to the second aspect, the outer mold is a non-magnetic material.
With the above configuration, if the outer mold is a magnetic body, the magnet of the core rotor is attracted to the outer mold and affects the rotation of the core rotor, but the outer mold is a non-magnetic body. Thus, the influence of the magnetic force is eliminated, and the rotation of the core type rotating body is improved.
[0015]
According to a fourth aspect of the present invention, in the composite rotating body according to the second aspect, the core-type rotating body is a magnet whose both ends are polarized to opposite polarities, and the central region is a non-magnetic body. To do.
With the above configuration, when magnets are provided at both ends of the core-type rotor, if the core rotor body is a magnetic body, magnetic lines of force are generated in the body, and the polarization changes to the opposite polarity. The balance of the force with other core type rotors is lost, but by making the central area of the core type rotors nonmagnetic, the effect of magnetic force is eliminated and the core type rotors rotate well. To.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples with reference to the drawings.
FIG. 1 is an axial sectional view of a cylindrical outer mold 6 made of a nonmagnetic material used in a centrifugal molding method. The outer mold 6 is a mold made of a non-magnetic material such as a cylindrical aluminum material, and the inner peripheral surface of the cylindrical shape is subjected to a turfrum treatment. The outer mold 6 is configured to be rotated around a horizontal axis. Two cylindrical core-type rotating bodies 7 are installed at the bottom of the inner surface of the outer mold 6. The two core-type rotators 7 are provided with ring-shaped magnets 8 each having an N-pole outer surface at both ends thereof. Further, the central region 7a of the core rotor 7 is formed of a nonmagnetic material.
[0017]
The principle configuration in which the magnets 8 having N poles on the outer surface are provided at both ends of the two core type rotors 7 is magnetic levitation. When two magnetic bodies having the same polarity, such as a permanent magnet, are brought close to each other, a repulsive force works and moves away, but a magnetic body that is not fixed in the gravitational field stays where the force is balanced by gravity. By using this principle and magnetizing a Gaussian amount of the magnet 8 commensurate with gravity, it is possible to hold the magnetic body at a predetermined gap.
[0018]
Therefore, as described above, by using two core-type rotators 7 provided with ring-shaped magnets 8 having the same surface on both ends, the two core-type rotators 7 are formed as shown in FIG. As shown in (a), the magnetic poles having the same polarity repel each other and become non-contact, and the gap is balanced by the balance between the weight of the core-type rotor 7 and the magnetic force due to the magnetic flux density. Determined. Further, even when the outer mold 6 is restricted by the curved surface of the inner wall, the balance between the weight component and the magnetic force according to the component force is obtained, and the core-type rotor is rotated with the rotation of the outer mold 6 without contacting each other. 7 can rotate smoothly.
[0019]
Further, as described above, the outer mold 6 is formed of a non-magnetic material because the ring-shaped magnet 8 of the core rotor 7 is attracted to the outer mold 6 when the outer mold 6 is a magnetic material. Since the rotation is not smooth, the outer mold 6 is made of a non-magnetic material so that the effect of magnetic force is eliminated and the rotation is made smooth. In addition, the central region 7a of the core-type rotor 7 is formed of a non-magnetic material when the ring-shaped magnets 8 are provided at both ends of the core-type rotor 7 so that the core rotor 7 main body is If it is a magnetic body, a magnetic force line is generated in the main body, the front / back heteropolar polarization changes, and the balance of the force with the other core-type rotating body 7 is lost. Therefore, the central region 7a of the core type rotator 7 is made of a non-magnetic material so that the influence of the magnetic force is eliminated and the rotation is made smooth.
[0020]
In the above-described embodiment shown in FIG. 1, the case where the magnets 8 are provided at both ends of the core-type rotating body 7 has been described. By providing in the whole area, the same effect as the embodiment described above can be obtained.
[0021]
[Example 1] Next, a more specific example of this embodiment will be described.
A cylindrical inner surface made of a cylindrical aluminum material having an inner diameter of 180 mm is subjected to a turfram treatment to form an outer mold 6, in which an outer diameter of 70 mm is fitted with ring-shaped magnets 8 having both ends of 20 mm and outer surfaces of N poles. Two core type rotors 7 were inserted. The two core rotors 7 are in contact with the cylindrical inner surface of the outer mold 4 in the vicinity of the bottom surface, but are separated from each other by 2 mm or more. Although the outer mold 4 was rotated, the rotation of the core-type rotating body 7 was smooth at the 700 rpm level because the distance between the core-type rotating bodies 7 was maintained.
[0022]
As a conductive material, a solution prepared by diluting a polyamideimide varnish with carbon book added to 30% in the solvent DMAC (N, N-dimethylacetamide) was injected into the outer mold 6 using a liquid injection nozzle and rotated at 100 rpm. After coating in the state, the coating film was made uniform while rotating at a high speed of 700 rpm, and the solvent was further dried at 80 ° C. Thereafter, the rotation was stopped, the mold was removed, the weir was removed, and it was transferred to a heating furnace, where it was first heated at 100 ° C. to preheat the solvent, and further heated at a temperature of 200 ° C. for complete removal. After the coating film was sufficiently cured, the film was cooled and taken out, but the film did not float and the cured film was formed well.
[0023]
The edges of both ends of the belt film were slightly lifted with a knife edge and peeled off from the end by hand, but the peeling was smooth and no peeling trace was left. In addition, the central portion of the belt film was glossy on the outer surface in contact with the inner surface of the mold, and an extremely smooth surface was obtained. The end of the belt thus prepared was cut off and mounted on a full-color copying machine as an intermediate transfer belt having a predetermined size to evaluate the image. The endless belt of Example 1 always had a smooth surface and was good without image blur.
[0024]
[Embodiment 2] Three core rotors having an outer diameter of 70 mm formed in the same manner as in the first embodiment are arranged on the outer mold of a cylindrical rotor having an inner diameter of 330 mm and rotated. Even at the 700 rpm level, the interval between the plurality of core-type rotors was maintained, and they were not in contact with each other, and the rotation was smooth. A polyamideimide coating solution prepared in advance was applied at a rotation rate of 100 rpm and heat-dried and cured to form a film that did not float. At the time of peeling and demolding, peeling occurred when it was made extremely smooth. The end of the belt thus prepared was cut off and mounted on a full-color copying machine as a fixing belt of a predetermined size, and the image was evaluated. The endless belt of Example 2 always had a smooth surface, no image blur, etc., and good fixability.
[0025]
[Comparative Example 1] A comparative example of Example 1 and Example 2 will be described.
Application drying was performed while rotating two core type rotors without magnets attached to the same outer mold as in Example 1 without using an auxiliary core type rotor. At the time of spin coating at 100 rpm, both of the core-type rotors were smoothly rotated. However, when the number of rotations is increased, the core-type rotor is returned to the bottom when pulled in the direction of rotation of the outer mold. When the rotation was further increased, the lifted core-type rotating body dropped at 500 rpm without being along the inner surface of the outer mold. When it was very bad, the core-type rotating body was deformed and the rotation was not smooth, so it could not be used again. Therefore, after the application of Comparative Example 1, the number of rotations was set to about 300 rpm, and the drying process was performed by rotating at a level where the core-type rotating body was not dropped. It was in a state where it was not fully stretched and waved.
[0026]
[Comparative Example 2] Coating and drying were carried out on the same outer mold as in Example 2 while rotating three core rotors without magnets without using an auxiliary core rotor. At the time of spin coating at 100 rpm, the three core-type rotors showed somewhat rocking motion, but the coating was possible with no significant fluctuations from the position of the coating nozzle. When the number of rotations was further increased, the core-type rotor that was lifted at 500 rpm fell off along the inner surface of the outer mold. When it was serious, the coating solution flowed out from the end of the core type rotor and contaminated the outer mold.
[0027]
【The invention's effect】
As described above, according to the first aspect of the invention, in the conventional centrifugal molding method, the rotation cannot be stopped unless the applied coating solution is dried to a touch dry level that does not stick even when touched with a finger. Therefore, although the production efficiency was low, the productivity can be improved by using a plurality of core-type rotating bodies provided with magnets having the same polarity on the surface. In addition, since the contact between the core-type rotating bodies can be prevented by the repulsive action of the magnetic force, the core-type rotating body can be smoothly rotated and the occurrence of a deformation accident or the like can be prevented. Therefore, centrifugal molding using a plurality of core-type rotating bodies can be realized, and a good coating film can be obtained.
[0028]
According to the invention of claim 2, by providing magnets polarized in the front and back different polarities in the entire axial direction or both ends of the core type rotor, the core rotors can be brought into non-contact with each other, The rotation can be made smooth.
[0029]
According to the third aspect of the present invention, the outer mold is made of a non-magnetic material, so that it is possible to eliminate the influence of magnetic force and make the rotation smooth.
[0030]
According to the invention of claim 4, since both ends of the core type rotating body are magnets polarized in opposite front and back sides and the central region is formed of a non-magnetic body, the rotation can be smoothly performed without the influence of magnetic force. It becomes possible to do.
[Brief description of the drawings]
1A and 1B are schematic cross-sectional views of a composite rotating body used in a method for producing an endless belt by centrifugal molding according to the present invention, where FIG. 1A is a radial cross section, and FIG. Direction cross section).
FIG. 2 is a schematic axial sectional view of a composite rotating body used in a conventional method for producing an endless belt by centrifugal molding.
FIG. 3 is a schematic cross-sectional view ((a) is a radial cross-section and (b) is a longitudinal cross-section) of a composite rotating body used in a conventional method for producing an endless belt by centrifugal molding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coating type 2 Release layer 3 Coating liquid 4, 6 Outer type 5, 7 Core type rotary body 7a Center part area | region 8 Magnet

Claims (4)

In the manufacturing method of an endless belt by centrifugal molding using a composite rotating body in which a plurality of core-type rotating bodies that are driven to rotate as the outer mold rotates are installed inside the rotating outer mold,
Manufacture of an endless belt characterized by using a core-type rotating body provided with magnets polarized on both sides or in the entire axial direction to prevent contact between core-type rotating bodies by the repulsive action of magnetic force Method. In a composite rotating body in which a plurality of core-type rotating bodies that are driven to rotate as the rotating body rotates are installed inside the rotating outer mold,
A composite rotator characterized in that magnets polarized in opposite front and back poles are provided at both ends or in the entire axial direction of the core rotator, and contact between the core rotators is prevented by a repulsive action of magnetic force .   3. The composite rotating body according to claim 2, wherein the outer mold is a non-magnetic body.   3. The composite rotator according to claim 2, wherein the core-type rotator is a magnet whose both ends are polarized to opposite polarities, and a central region is a non-magnetic body.

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