WO2005003865A1

WO2005003865A1 - Hot roll and fixing device

Info

Publication number: WO2005003865A1
Application number: PCT/JP2004/008792
Authority: WO
Inventors: Koji Ikeda
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2003-07-01
Filing date: 2004-06-16
Publication date: 2005-01-13
Also published as: JPWO2005003865A1

Abstract

A hot roll and a fixing device, the hot roll wherein a heat transfer body (3) formed mainly of water is held in a hollow cylindrical core (2). Both ends of the core (2) are sealed by sealing members (4). A heat transfer body agitating means (8) comprises a plurality of agitating blades (8a), an agitating support shaft (8b), and agitating support shaft fixing members (8c), and connected to both ends of the core (2). The heat transfer body agitating means (8) is rotated according to the rotation of the core (2). In this case, the agitating blades (8a) come into contact with the heat transfer body (3). When the agitating blades (8a) are rotated, the heat transfer body (3) flows in the axial direction of the core. Since the heat transfer body (3) with non-uniform temperature is mixed, the temperature of he hot roll (1) is uniformized. The heat transfer body agitating means (8) may comprise a steel stirrer held in the core (2) and magnets moving the stirrer in the axial direction of the core.

Description

Heat roll and fixing device

The present invention relates to a heat roll capable of maintaining a uniform surface temperature, and a copying machine.

FAX (facsimile machine), which relates to a fixing device used in an electronic photographic device using an electrophotographic process such as a printer. Background art

Conventionally, it has been known to use a heat pipe as a method for equalizing the temperature of an object. This heat pipe is a heat conductor equipped with an appropriate amount of hydraulic fluid and a wick that promotes its reflux in a vacuumed pipe. In this heat pipe, the working fluid evaporates in the high-temperature part, takes latent heat and turns into steam, and this steam moves to the low-temperature part due to the pressure difference, where it is cooled and releases latent heat to liquefy. As a result, the heat in the high-temperature portion moves to the low-temperature portion, and the temperature of the object can be made uniform. Then, the liquefied working fluid is returned by the wick by reflux. This heat pipe has an extremely high heat transfer capability and is extremely excellent in that the temperature of the object can be equalized even when it is stationary. However, when the heat pipe is a large one having a large diameter, the temperature can be made uniform, but the heat capacity of the heat pipe itself is undesirably large. If the heat pipe has a small diameter, the heat capacity of the heat pipe itself is small, but the hydraulic fluid tends to be unevenly distributed to be in a liquid-out state (dry-out), and the heat transfer capacity is likely to decrease. Also, it is very difficult to cut a grooved wick or wind a wire mesh wick into such a thin heat pipe, which makes the heat pipe expensive. .

In order to solve this problem, the one disclosed in Japanese Patent Publication No. H8-7511 (hereinafter referred to as patent document) has been proposed. The structure of the proposed heat pipe is as shown in Fig. 21. This heat pipe uses an elastic metal wire from the center to the free end. And a metal tube 102 in which a hairpin-like wick 106 and a working fluid 103 are bent so as to gradually increase the mutual interval. It is assumed that this heat pipe is used in a substantially horizontal state and that the heat pipe rotates, but when the heat pipe rotates, the wick 106 is enclosed in the metal tube 102 The working fluid 103 acts to recirculate in the axial direction of the tube. Thereby, the circulation of the working fluid 103 in the metal tube 102 is performed smoothly, and a liquid shortage state due to evaporation hardly occurs, and high heat conductivity can be maintained. Further, since the wick 106 has a very simple configuration, the heat pipe can be easily manufactured even when the diameter of the metal tube 102 is small.

However, in order to make the temperature more uniform, there is a need for a heat pipe that is small in size and has high heat transfer capacity. In a normal heat pipe, the maximum heat transfer capacity, that is, the maximum heat transfer rate, is not only the limit of the heat transfer capacity from the metal tube 102 to the working fluid 103, but also the so-called viscosity limit, Determined by sound speed limit, splash limit, capillary limit, and boiling limit. On the other hand, the one shown in the patent document has a means for recirculating the hydraulic fluid 103 in the axial direction of the pipe, so that the maximum heat transfer amount can be improved by the means. Since the transfer of latent heat is mainly due to liquefaction, there are viscosity limits, sonic speed limits, scattering limits, capillary limits, and boiling limits, and it is not easy to increase the maximum heat transport. In addition, the hydraulic fluid 103 is recirculated in the axial direction of the tube using a hairpin-shaped wick 106, but this only utilizes the surface tension of the hydraulic fluid 103. Therefore, it was difficult to increase the movement amount of the hydraulic fluid 103.

Further, in the heat pipe proposed in the patent document, the elasticity of the wick 106 itself is used for holding the wick 106, and the wick 106 has an axially central portion formed on the inner wall of the metal tube 102. It is fixed in a state where it is pressed against. This is not a problem when the metal tube 102 is thick and has a large heat capacity.However, when the heat capacity of the metal tube 102 is small and high-precision temperature uniformity is required, The temperature differs between the part where the metal tube 102 and the part 106 are in contact with each other, and this is a problem. Disclosure of the invention The present invention has been made in view of such a point. One of the objects of the present invention is to provide a heat roll having a more uniform heat transfer capability than conventional heat pipes, thereby providing a more uniform temperature roll. Another object of the present invention is to provide a heat roll having a more uniform temperature by eliminating temperature unevenness due to partial contact with a metal tube such as a wick.

The heat roll according to the present invention includes a hollow cylindrical cored bar, a heat transfer body held in the cored bar and movable in an axial direction of the cored bar, and the core so that the heat transferer does not flow out. A sealing member for sealing both ends of the gold; and a heat transfer body stirring means for rotating the heat transfer body in the axial direction of the core by rotating about the axis of the core, and The body agitating means is rotatable integrally with the core metal without relative speed, and is configured such that at least a portion thereof contacts the heat transfer body while the core metal rotates about an axis. The main support of the heat transfer body stirring means is performed at both ends of the sealing member portion or the core bar, and the heat transfer body stirring means fixes the heat transfer body to the core. It is configured to move in the axial direction of gold. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

The heat roll does not transfer latent heat due to vaporization and liquefaction of the heat transfer body, but rather stirs the heat transfer body itself with a temperature difference, thereby transferring heat, so that even the heat transfer body is sufficiently stirred. If performed, the limit of heat transfer in the axial direction is almost determined by the limit of heat transfer from the core metal to the heat transfer body. Therefore, it is possible to provide a heat roll having a more uniform temperature than the conventional heat pipe.

Further, in the above-mentioned heat roll, the main support of the heat transfer body stirring means is performed at the sealing members provided at both ends of the metal core or at both ends of the metal core. Since the portion other than the heat transfer body does not come into contact with the portion, the temperature of the heat roll can be made uniform.

Further, it is preferable that the heat roll includes a rotation support shaft that supports rotation of the cored bar, and the heat transfer body stirring means is formed integrally with the rotation support shaft.

This makes it possible to realize the support of the cored bar and the heat transfer body stirring means with a very simple configuration. , 8792

(4) Another heat roll according to the present invention includes a hollow cylindrical metal core, a heat transfer member held in the core metal and movable in an axial direction of the core metal, and preventing the heat transfer member from flowing out. A sealing member that seals both ends of the metal core, a rotation support shaft that supports rotation of the metal core, and is rotatable with respect to the metal core and coaxial with the metal core; A heat transfer body stirring means for moving the heat transfer body in the axial direction of the metal core by a relative rotation with respect to a rotation support shaft, wherein the heat transfer body stirring means is formed integrally with the rotation support shaft; At least a portion is disposed so as to be in contact with the heat transfer body during the relative rotation between the core metal and the rotation support shaft, and the heat transfer body stirring means connects the heat transfer body with the shaft of the core metal. It is configured to move in the direction. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

Even in the above-mentioned heat roll, the stirring of the heat transfer element is not sufficient because the heat transfer element does not transfer latent heat due to vaporization and liquefaction of the heat transfer element, but stirs the heat transfer element itself having a temperature difference, thereby transferring heat. If done, the limit of heat transfer in the axial direction is largely determined by the limit of heat transfer from the mandrel to the heat transfer element. Therefore, it is possible to provide a hot hole having a more uniform temperature than the conventional heat pipe.

In addition, since the heat transfer body stirring means is rotatably supported with respect to the core, the heat transfer body stirring means rotates when the core is stationary, or the heat transfer is performed when the core is rotated. The heat stirring means can be used either in the case of rotation. Further, the rotation of the heat transfer body stirring means may be opposite to the rotation direction of the cored bar. Furthermore, it is possible to freely increase the relative rotation speed of the heat transfer body stirring means with respect to the heat transfer body, thereby increasing the amount and speed of movement of the heat transfer body in the axial direction of the metal core. Therefore, it is possible to provide a heat roll having high temperature equalizing ability.

Also, in the above-mentioned heat roll, since the heat transfer body stirring means is formed integrally with the rotary support shaft, any part other than the heat transfer body does not come into contact with portions other than both end portions of the cored bar. Therefore, the temperature of the heat roll can be made uniform.

Another heat roll according to the present invention includes: a hollow cylindrical cored bar; a heat transfer body held in the cored bar and movable in an axial direction of the cored bar; and preventing the heat transfer body from flowing out. A sealing member for sealing both ends of the metal core, and by rotating around a shaft of the metal core, A heat transfer body stirring means for moving the heat transfer body in the axial direction of the core metal, wherein the heat transfer body is moved in the axial direction of the core metal by the heat transfer body stirring means; In a sectional view perpendicular to the axial direction of the cored bar, the flow of the heat transfer body in the axial direction of the cored bar is divided into a plurality. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

In the above-mentioned heat roll, the flow of the heat transfer body is, for example, a flow from the axial left side (one axial end) to the axial right side (the other axial end) and a flow from the axial right side to the axial left side. The heat transfer body can be smoothly circulated in the core metal because it is clearly divided. Therefore, a heat roll having a uniform temperature can be provided.

Further, in the heat roll, the heat transfer body stirring means is rotatably supported, and is provided with a stirring member arranged so that at least a portion thereof contacts the heat transfer body during rotation, and an inside of the core metal and an outside of the stirring member. It is preferable that the heat transfer member has a pipe-shaped heat transfer member forming member disposed in the heat transfer member, and that the flow direction of the heat transfer member is opposite between the inside and the outside of the heat transfer member forming member.

Also in the above-described heat roll, the flow of the heat transfer body is clearly divided into a flow from the left side in the axial direction of the metal core to the right side in the axial direction and a flow from the right side in the axial direction to the left side in the axial direction. Circulation in the metal core can be performed smoothly. Therefore, a heat roll having a uniform temperature can be provided.

In the heat roll, it is preferable that a flow of the heat transfer body in an axial direction of the core metal is divided into a plurality of parts in a cross-sectional view parallel to the axial direction of the metal core.

Accordingly, for example, when the present heat roll is used to equalize the temperature of an object having a temperature variation between the both ends in the axial direction and the central portion in the axial direction, the flow of the heat transfer material is, for example, the core. Since the flow of gold is divided into a flow from the center in the axial direction to the left in the axial direction and a flow from the center in the axial direction to the right in the axial direction, the temperature can be made more uniform.

In the heat roll, the heat transfer body stirring means is preferably made of a nonmetallic material.

This makes it difficult for heat to be transferred to the heat transfer body stirring means, and reduces the heat capacity of the heat roll. Can be reduced.

Further, in the heat roll, the heat transfer body is preferably made of a liquid.

Thereby, a sufficient contact area between the core metal and the heat transfer body can be secured, and heat can be sufficiently transmitted between the core metal and the heat transfer body.

In the heat roll, the heat transfer body is preferably made of metal.

As a result, since the metal has a good thermal conductivity, even when the contact area between the core metal and the heat conductor is small, heat can be sufficiently transmitted between the core metal and the heat conductor. . Also, metals are generally hundreds. Since C is a solid, the core metal can be sealed with a sealing member having a simple configuration.

Further, in the heat roll, the heat transfer body is preferably made of a liquid and a metal. This makes it possible to ensure a sufficient contact area between the cored bar and the heat transfer body and to obtain a heat transfer body having good thermal conductivity. Therefore, the amount of heat transfer between the cored bar and the heat transfer body can be improved.

Further, in the heat roll, the ratio of the volume of the heat transfer body to the total volume of the space in the cored bar is preferably 10% or more and 70% or less.

As a result, efficient heat conduction becomes possible, and the temperature of the heat roll can be made uniform.

The heat roll further includes an atmosphere communication unit for communicating the outside of the core bar with the inside of the core bar. The air communication unit is normally in a non-communication state, but is abnormal when the temperature is abnormally increased. Preferably, only the communication state is established.

As a result, even if the temperature of the heat roll rises to an abnormally high temperature exceeding its use temperature, and even if the pressure inside the heat roll increases, vaporized vapor is discharged to the outside by the air communication means, and the pressure inside the heat roll is reduced. Can be reduced. Therefore, it is possible to prevent the danger caused by the breakage of the heat roll.

In the above-mentioned heat roll, the atmosphere communicating means has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. It is preferable that

Thereby, when the inside of the heat roll becomes high pressure, the pressure inside the heat roll can be reduced by breaking the predetermined thin portion. for that reason, With very simple measures, the dangers associated with breaking the thermo roll can be prevented.

Further, in the heat roll, it is preferable that a main component of the liquid is water, and at least a part of a portion of the core metal that contacts the liquid is subjected to a water-repellent treatment.

As a result, a liquid thin film is not formed on the inner wall of the metal core, so that good heat transfer between the metal core and the heat transfer body can be maintained.

Further, in the heat roll, it is preferable that a main component of the liquid is water, and that an antifoaming agent is added to the water.

Also in this case, since the liquid thin film is not formed on the inner wall of the metal core and no air bubbles are generated, the heat transfer material flows smoothly. Therefore, good heat transfer between the cored bar and the heat transfer body can be maintained.

Further, in the heat roll, the liquid constituting the heat transfer member is non-volatile within the operating temperature range of the heat roll, and the sealing member is an air communication portion that communicates the outside of the core with the inside of the core. It is preferable that the liquid level of the liquid is lower than the air communication portion.

As a result, the sealing by the sealing member is sufficient to prevent the liquid from leaking. Further, since the air communication portion is provided, the internal pressure of the heat roll does not increase, and the danger of breakage of the heat roll can be prevented. Can be eliminated.

The fixing device according to the present invention includes a heat roll, wherein the heat roll has a hollow cylindrical core, and a transmission held in the core and movable in an axial direction of the core. A heating element, a sealing member that seals both ends of the metal core so that the heat transfer element does not flow out, and an axial direction of the metal core by rotating around the axis of the metal core. And a heat transfer body stirring means for moving the heat transfer body stirring means so that the heat transfer body stirring means can be rotated integrally with the core metal without a relative speed, and while the core metal rotates about an axis, At least a portion is disposed inside the metal core so as to be in contact with the heat transfer member, and the main support of the heat transfer member stirring means is performed at the sealing member portion or at both end portions of the core metal. The heat transfer body is moved in the axial direction of the metal core by the heat transfer body stirring means. Are those configured urchin. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform. According to another aspect of the present invention, there is provided a fixing device including a heat roll, wherein the heat roll has a hollow cylindrical core, and is held in the core. A movable heat transfer member, a sealing member for sealing both ends of the core bar so as to prevent the heat transfer member from flowing out, and a support member for supporting rotation of the core bar, coaxial with the core bar and the core. A rotating support shaft rotatable with respect to gold; and a heat transfer body stirring means for moving the heat transfer body in the axial direction of the core by relative rotation between the core and the rotation support shaft. The body stirring means is formed integrally with the rotation support shaft, and is arranged so that at least a part thereof comes into contact with the heat transfer body during relative rotation between the cored bar and the rotation support shaft. The heat transfer body is configured to move the heat transfer body in the axial direction of the metal core by heat transfer body stirring means. It is those who are. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

According to another aspect of the present invention, there is provided a fixing device including a heat roll, wherein the heat roll has a hollow cylindrical core, and is held in the core. A movable heat transfer member, a sealing member for sealing both ends of the core bar so that the heat transfer member does not flow out, and the heat transfer member is rotated by rotating about a shaft of the core bar. A heat transfer body stirring means for moving the heat transfer body in the axial direction of the metal core, wherein the heat transfer body is moved in the axial direction of the metal core by the heat transfer body stirring means. Thus, the temperature of the heat transfer body is made uniform in the axial direction of the metal core, whereby the temperature of the metal core is made uniform, and in a cross-sectional view perpendicular to the axial direction of the metal core, The flow of the core metal in the axial direction is divided into a plurality. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

As a result, the heat transfer capability in the axial direction of the metal core can be increased while suppressing the increase in heat capacity, so that a heat roll with a uniform temperature that suppresses an increase in warm-up time and an increase in energy required for heat retention. We can provide fixing devices.

Further, in the fixing device, a portion in contact with the unfixed toner image on the recording paper is an endless fixing belt stretched by a plurality of rolls, and at least one of the plurality of rolls is a heat roll. Is preferred. As a result, the temperature uniforming ability of the heat roll can be effectively utilized for the fixing device, and a fixing device having a uniform fixing temperature can be provided.

In the fixing device, when the set temperature of a portion in contact with the unfixed toner image on the recording paper is T 1 ° C and the ignition temperature of the heat transfer body is T 2 ° C, (T 1 +50) It is preferably 2.

As a result, even in the event of an abnormality, it is possible to reduce the risk of ignition of the heat transfer body and the like, and to provide a highly safe fixing device.

Another heat roll according to the present invention includes: a hollow cylindrical cored bar; a heat transfer body held in the cored bar and movable in an axial direction of the cored bar; and preventing the heat transfer body from flowing out. A sealing member for sealing both ends of the core, and a heat transfer stirring means for moving the heat transfer body in the axial direction of the core, wherein the heat transfer stirring means is provided inside the core. A stirrer that is held and includes at least one of a magnet and a magnetic body; and a magnetic field changing unit that changes a magnetic field applied to the stirrer, wherein the stirring is performed by a magnetic field change by the magnetic field changing unit. The heat transfer element is moved in the axial direction of the metal core by moving the core in the axial direction of the metal core. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

The heat roll does not transfer latent heat due to vaporization and liquefaction of the heat transfer body, but rather stirs the heat transfer body itself with a temperature difference, thereby transferring heat, so that even the heat transfer body is sufficiently stirred. If performed, the limit of heat transfer in the axial direction is almost determined by the limit of heat transfer from the core metal to the heat transfer body. Further, in this configuration, the stirrer is moved by the magnetic force, and thereby the heat transfer body is moved. Therefore, the heat transfer body is easier to move than the case where the stirrer is moved only by the surface tension of the heat transfer body. Therefore, it is possible to provide a heat roll having a more uniform temperature than the conventional heat pipe.

Further, in the heat roll, the magnetic field changing means is provided outside the metal core and includes a magnetic field forming member including at least one of a magnet and a magnetic body; and the magnetic field forming member is moved in the axial direction of the metal core. And a magnetic-field-forming member moving means, and at least one of the stirrer and the magnetic-field forming member preferably includes a magnet.

This makes it possible to reliably move the stirrer with a very simple configuration. In the heat roll, the core is preferably made of a non-magnetic material. Thereby, the magnetic field formed by the stirrer and the magnetic field forming member is not weakened by the cored bar. Therefore, the force can be sufficiently transmitted to the stirrer, and the stirrer can be reliably moved, so that the heat transfer body can be favorably stirred. '

Further, in the heat roll, the stirrer preferably has a coating layer for preventing deterioration such as corrosion.

As a result, since the stirrer has a coating layer, even if the stirrer itself becomes hot or the surrounding area of the stirrer becomes high temperature, the stirrer does not corrode, etc. Can be maintained. Therefore, the stirrer can be moved in a stable state for a long time.

Further, in the heat roll, it is preferable that the stirrer also serves as a heat transfer body. As a result, the number of components of the heat roll can be reduced, and thus the cost of the heat roll can be reduced.

Further, in the heat roll, a pipe-shaped heat transfer member forming member is provided inside the metal core and outside the stirrer, and the flow of the heat transfer member between the inside and outside of the heat transfer member forming member Preferably, the directions are opposite.

As a result, the flow of the heat transfer medium between the inside and outside of the heat transfer passage forming member is divided into a flow from the left side in the axial direction to the right side in the axial direction and a flow from the right side in the axial direction to the left side in the axial direction. The heat transfer body can be smoothly circulated in the metal core because it is clearly divided. Therefore, a heat roll having a uniform temperature can be provided.

In the heat roll, it is preferable that a flow of the heat transfer body in an axial direction of the core metal is divided into a plurality of parts in a cross-sectional view parallel to the axial direction of the metal core. Accordingly, for example, when the present heat roll is used to equalize the temperature of an object having a temperature variation between the both ends in the axial direction and the central portion in the axial direction, the flow of the heat transfer material is, for example, the core. Since the flow of gold is divided into a flow from the central part in the axial direction to the left in the axial direction and a flow from the central part in the axial direction to the right in the axial direction, the temperature can be made more uniform.

Further, in the heat roll, the heat transfer body is preferably made of a liquid. Thereby, a sufficient contact area between the core metal and the heat transfer body can be secured, and heat can be sufficiently transmitted between the core metal and the heat transfer body.

In the heat roll, the heat transfer body is preferably made of metal.

As a result, since the metal has a good thermal conductivity, even when the contact area between the core metal and the heat conductor is small, heat can be sufficiently transmitted between the core metal and the heat conductor. . Also, metals are generally hundreds. In the state of C, since the solid is solid, the core metal can be sealed with a sealing member having a simple configuration.

Further, in the heat roll, the ratio of the volume of the heat transfer body to the total space volume in the cored bar is preferably 10% or more and 80% or less.

Further, in the heat roll, an air communication means for communicating the outside of the core metal with the inside of the core metal is provided, and the air communication means is normally in a non-communication state, and only when an abnormal temperature rises abnormally. It is preferable to be in a communication state.

Thereby, when the inside of the heat roll becomes high pressure, the pressure inside the heat roll can be reduced by breaking the predetermined thin portion. Therefore, it is possible to prevent the danger caused by the breakage of the hot roll by using very simple means.

Further, in the heat roll, the main component of the liquid constituting the heat transfer body is water, It is preferable that at least a part of a portion of the gold in contact with the liquid has been subjected to a water-repellent treatment.

Further, in the heat roll, it is preferable that a main component of the liquid constituting the heat transfer body is water, and the liquid further contains an antifoaming agent.

As a result, a liquid thin film is not formed on the inner wall of the metal core, and no air bubbles are generated, so that the heat transfer body flows smoothly. Therefore, good heat transfer between the cored bar and the heat transfer body can be maintained.

The fixing device according to the present invention includes a heat roll, wherein the heat roll has a hollow cylindrical core, and a transmission held in the core and movable in an axial direction of the core. A heating element, a sealing member that seals both ends of the metal core so that the heat transfer element does not flow out, and a heat element stirring unit that moves the heat element in the axial direction of the metal core, The heat transfer body stirring means includes: a stirrer that is held inside the core bar and includes at least one of a magnet and a magnetic body; and a magnetic field changing unit that changes a magnetic field applied to the stirrer. The stirrer is moved in the axial direction of the core by changing the magnetic field by the magnetic field changing means, and the heat transfer member is moved in the axial direction of the core by moving the stirrer. It is. The movement of the heat transfer body makes the temperature of the heat transfer body uniform in the axial direction of the metal core, thereby making the temperature of the metal core uniform.

As a result, the heat conduction capacity in the axial direction of the metal core can be increased while suppressing an increase in the heat capacity, so that the warm-up time is increased and the energy required for heat retention is increased. 4 008792

It is possible to provide a fixing device having a heat roll with a uniform temperature and suppressed temperature. In the fixing device, a portion in contact with the unfixed toner image on the recording paper is an endless fixing belt stretched by a plurality of rolls, and at least one of the plurality of rolls is the heat roll. Is preferred.

As a result, the temperature uniforming ability of the heat roll can be effectively utilized for the fixing device, and a fixing device having a uniform fixing temperature can be provided.

Further, in the fixing device, when the set temperature of a portion in contact with the unfixed toner image on the recording paper is T 1 ° C and the ignition temperature of the heat transfer body is T 2 ° C, (T 1 +50) <T It is preferably 2. .

As a result, even in the event of an abnormality, it is possible to reduce the risk of ignition of the heat transfer body and the like, and to provide a highly safe fixing device. Brief Description of Drawings

FIG. 1 is a schematic sectional view of a hot roll according to Embodiment 1 of the present invention.

FIG. 2 is a schematic sectional view of the heat roll according to the second embodiment.

FIG. 3 is a schematic cross-sectional view of the heat roll according to the third embodiment.

FIG. 4 is a schematic cross-sectional view of the heat roll according to the fourth embodiment.

FIG. 5 is a schematic cross-sectional view of the heat roll according to the fifth embodiment.

FIG. 6 is a perspective view of a heat roll according to the fifth embodiment.

FIG. 7 is a schematic cross-sectional view of the heat roll according to the sixth embodiment.

FIG. 8 is a schematic sectional view showing another configuration of the heat roll according to the sixth embodiment.

FIG. 9 is a schematic cross-sectional view of the hot roll according to the seventh embodiment.

FIG. 10 is a schematic sectional view of the hot roll according to the eighth embodiment.

FIG. 11 is a schematic cross-sectional view of the hot roll according to the ninth embodiment.

FIG. 12 is a schematic sectional view of the hot roll according to the tenth embodiment.

FIG. 13 is a schematic cross-sectional view of the hot roll according to Embodiment 11.

FIG. 14 is a schematic cross-sectional view of the hot roll according to Embodiment 12.

FIG. 15 is a schematic cross-sectional view of the hot roll according to Embodiment 13.

FIG. 16 is a schematic configuration diagram of the hot roll according to Embodiment 14. FIG. 17 is a schematic cross-sectional view of the hot roll according to Embodiment 15.

FIG. 18 is a side view of the fixing device according to Embodiment 16.

FIG. 19 is a schematic configuration diagram showing an example of the configuration of the magnetic field changing means of the heat roll used in the fixing device according to Embodiment 16.

FIG. 20 is a side view of the fixing device according to the seventeenth embodiment.

FIG. 21 is a schematic sectional view of a conventional heat pipe. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)

As shown in Fig. 1, reference numeral 2 denotes a hollow cylindrical cored bar made of aluminum having an outer diameter of 20 mm, a wall thickness of 0.5 mm, and a length of 250 mm. Heating body 3 is enclosed and held. The inner peripheral surface of the cored bar 2 is subjected to a silicone-based or fluorine-based water-repellent treatment. Reference numeral 4 denotes a sealing member that seals both ends of the metal core 2 so that the heat transfer body 3 does not flow out, and includes an outer ring 4a made of aluminum and an inner ring 4b made of phenol resin having good heat resistance. And Further, a metal film 4c is formed on the surface of the inner ring 4b on the side in contact with the heat transfer body 3 (that is, the inner surface of the inner ring 4b in the axial direction of the metal core). Further, a rotation support shaft 5 made of metal such as stainless steel and supporting the rotation of the cored bar 2 is press-fitted into the inner ring 4b. The rotation support shaft 5 extends outward from the inner race 4b in the core metal shaft direction. The sealing member 4 is joined to the metal core 2 by welding. Thereby, even if the heat transfer body 3 evaporates, the core 2 can be completely sealed. Reference numeral 8 denotes a heat transfer body stirring means, which includes a plurality of stirring blades 8a, a stirring support shaft 8b, and a stirring support shaft fixing member 8c, all of which are made of phenolic resin. The heat transfer body stirring means 8 is arranged in the metal core 2, and is joined at both ends of the metal core 2. Thereby, the heat transfer body stirring means 8 rotates without relative speed with respect to the cored bar 2 with the rotation of the cored bar 2. The stirring blade 8 a is formed integrally with the stirring support shaft 8 b and is in contact with the heat transfer body 3. The stirring blade 8a generates a flow of the heat transfer body 3 in the axial direction of the metal core by rotating about the axis of the metal core 2. The stirring support shaft 8b extends inside the cored bar 2 in the axial direction. The stirring support shaft fixing member 8c fixes both axial ends of the stirring support shaft 8b. I support it. To facilitate understanding of the figure, the cross-sectional shapes of the stirring blade 8a and the stirring support shaft 8b are not described.

The heat transfer body 3 is mainly composed of water, and has an antifoaming agent added thereto. As the defoaming agent, a silicone emulsion type or a self-emulsifying type is preferably used. In the present embodiment, an emulsion type KM 98 (manufactured by Shin-Etsu Chemical Co., Ltd.) is used, and the amount of addition is 100 ppm. By the way, the use of a surfactant to reduce the surface tension of water and improve the fluidity of the heat transfer body 3 was also studied, but in this case, the flow of the heat transfer body 3 was hindered by the generation of bubbles. For this reason, in the present embodiment, an antifoaming agent is used as described above. Further, the amount of the heat transfer body 3 enclosed is preferably 10% to 70%, more preferably 30% to 60%, of the total space volume inside the cored bar 2. In this embodiment, the volume is 50%.

Reference numeral 9 denotes an atmosphere communicating means, which is formed by making a part of the end of the cored bar 2 thinner than its neighboring part.

Next, the operation will be described. First, let us consider a state where the axial temperature of the cored bar 2 varies. At this time, the temperature of the heat transfer body 3 in the axial direction of the core metal also varies. Here, the core 2 is rotated in the direction of the arrow shown in FIG. With this rotation, the heat transfer body stirring means 8 also rotates without relative speed with respect to the cored bar 2. With this rotation, the heat transfer body 3 flows in the axial direction of the metal core. By this flow, the heat transfer body 3 is agitated in the axial direction of the core metal o

By the way, if the main support of the heat transfer body stirring means 8 is provided at the central portion in the axial direction of the metal core 2, the heat of the metal core 2 is transferred from the support portion, and the temperature of the metal core 2 becomes uneven. In the heat roll 1 in which such temperature unevenness occurs, it is difficult to equalize the temperature of a member to be brought into contact with the heat roll 1. Here, in the present heat roll 1, the heat transfer member stirring means 8 is supported at both ends of the cored bar 2. Therefore, in the present heat roll 1, anything other than the heat transfer body 3 does not come into contact with portions other than both end portions of the cored bar 2. Thereby, the temperature of the hot-hole 1 can be made uniform.

Further, the heat transfer body 3 is stirred by the heat transfer body stirring means 8 in the axial direction of the metal core, and the heat transfer bodies 3 having different temperatures are mixed to form the heat transfer body 3 having a uniform temperature. As a result, the core metal 2 The temperature can be made uniform in the axial direction, and the temperature of the member to be brought into contact with the heat roll 1 can be made uniform. In this configuration, unlike the so-called heat pipe, which transfers latent heat due to vaporization and liquefaction of the heat transfer body 3, the heat transfer body 3 that has a temperature difference is stirred and heat is transferred by the heat transfer body 3. As long as stirring is performed sufficiently, the limit of heat transfer in the axial direction of the metal core is almost determined only by the limit of heat transfer from the metal core 2 to the heat transfer body 3. Therefore, it is possible to provide the heat roll 1 having a more uniform temperature than the conventional heat pipe.

Further, the heat transfer body stirring means 8 is formed of a nonmetallic phenol resin. Here, nonmetals have lower thermal conductivity than metals. Therefore, it is difficult for heat to be transmitted to the heat transfer body stirring means 8. Therefore, the substantial heat capacity of the heat transfer body stirring means 8 can be suppressed low, whereby the heat capacity of the heat roll 1 can be suppressed low. Liquid is used as the heat transfer body 3. Thereby, a sufficient contact area between the core metal 2 and the heat transfer body 3 can be ensured, and heat can be sufficiently transmitted between the core metal 2 and the heat transfer body 3. Therefore, a heat roll having a high temperature uniformity can be obtained.

The ratio of the volume of the heat transfer body 3 to the total volume of the space in the cored bar 2 is set to 10% or more and 7 °% or less. Here, if the volume ratio of the heat transfer body 3 is small, it is not possible to secure a sufficient contact area between the heat transfer body 3 and the core 2, and thus heat transfer between the core 2 and the heat transfer body 3. Is not done enough. Conversely, if the volume ratio of the heat transfer bodies 3 is too large, it is difficult for the heat transfer bodies 3 to move smoothly in the cored bar 2 and it is difficult for the heat transfer bodies 3 having different temperatures to mix. In the present embodiment, since the heat conductor 3 having an appropriate volume ratio is sealed, efficient heat conduction is possible, and the temperature of the heat roll 1 can be made uniform efficiently.

The core 2 has an atmosphere communicating means 9 for communicating the outside (atmosphere) of the core 2 with the inside of the core 2, and the atmosphere communicating means 9 is normally in a non-communication state at normal times. On the other hand, the communication is set only when the temperature of the heat roll 1 rises abnormally and the pressure inside the heat roll 1 rises abnormally. As a result, the temperature of the heat roll rises to an abnormally high temperature exceeding its use temperature, and even if the pressure inside the heat roll 1 increases, the vaporized gas is released to the outside by the air communication means 9 and the inside of the heat roll 1 is discharged. Pressure can be reduced. Therefore, the danger caused by the destruction of the heat roll 1 is prevented. can do.

Further, the atmosphere communication means 9 is composed of a portion where the thickness of the cored bar 2 is thinner than other portions. In other words, if the temperature of the heat roll 1 rises abnormally due to a trouble and the pressure inside the heat roll 1 rises abnormally, the part where the thickness of the core 2 is thinner than the other parts will be destroyed first Like that. Therefore, the mode of destruction can be controlled by a very simple means, and the danger associated with destruction of the hot roll 1 can be prevented.

The main component of the heat transfer body 3 is water, and at least a part of the portion of the core metal 2 in contact with the heat transfer body 3 is subjected to a water-repellent treatment. It becomes difficult to form the thin film of 3. Thereby, good heat transfer between the cored bar 2 and the heat transfer body 3 can be maintained.

Further, the main component of the heat transfer body 3 is water, and since an antifoaming agent is added to the water, even in this case, a thin film of the heat transfer body 3 is not formed on the cored bar 2. . Therefore, good heat transfer between the core metal 2 and the heat transfer body 3 can be maintained.

In the present embodiment, the heat transfer body stirring means 8 is joined and held at both ends of the metal core 2, but may be held by joining with the sealing member 4. Furthermore, as long as the main support of the heat transfer body stirring means 8 is provided only at both ends of the core 2 or the sealing member 4, for example, a part of the heat transfer body stirring means 8 comes into contact with a part other than both ends of the core 2. There is no problem if you do. ·

Further, in the present embodiment, the heat transfer member 3 is obtained by adding an antifoaming agent to water. However, it is also possible to use only water, and further to use a liquid other than water, for example, methanol, ammonia, or the like. be able to.

Further, in the present embodiment, a part of the end of the cored bar 2 is made thinner as the atmospheric communication means 9, but this may be a part of the sealing member 4 made thinner. Further, a pressure relief valve, a pressure adjustment valve, or the like provided on the cored bar 2 or the sealing member 4 may be used. In that case, even if the air communication means 9 operates, if the temperature decreases and the internal pressure decreases, the heat roll 1 can be used again.

Further, in the present embodiment, the heat transfer body stirring means 8 is formed of a phenol resin, but this is a non-metallic heat-resistant material that can sufficiently withstand the operating temperature of the heat roll 1. Other materials may be used as long as they have properties. Further, the heat transfer body stirring means 8 is composed of members of a stirring blade 8a, a stirring support shaft 8b and a stirring support shaft fixing member 8c, which are formed from one member. It may be something.

(Embodiment 2)

As shown in FIG. 2, in the heat roll 1 according to Embodiment 2, the rotary support shaft 5 also serves as the stirring support shaft 8b and the stirring support shaft fixing member 8c. That is, the rotation support shaft 5 extends in the cored bar 2 in the axial direction, passes through the inner ring 4b, and extends outward from the inner ring 4b in the cored bar axial direction. In the first embodiment, the stirring support shaft 8 b is formed of phenol resin. However, in the present embodiment, the rotation support shaft 5 is formed from the viewpoint of the strength of the rotation support shaft 5 and the viewpoint of sealing the metal core 2. It is made of metal such as stainless steel. The stirring blade 8 a is formed integrally with the rotation support shaft 5.

From the viewpoint of sealing the metal core 2, as in Embodiment 1, the sealing member 4 is formed of an outer ring 4a made of aluminum and an inner ring 4b made of phenol resin having good heat resistance. It is joined to the core 2 by welding. Also, a metal film 4c is formed on the surface of the inner ring 4b on the atmosphere side (that is, the outer surface of the inner ring 4b in the axial direction of the metal core), and the metal film 4c is joined to the rotating support shaft 5. The parts are treated by welding and soldering. Other points are the same as in the first embodiment.

As described above, since the rotary support shaft 5 also serves as the stirring support shaft 8b and the stirring support shaft fixing member 8c, the number of members can be reduced, and the cost of the heat roll 1 can be reduced. it can.

(Embodiment 3)

As shown in FIG. 3, the heat roll 1 according to the third embodiment is configured such that the rotation support shaft 5 according to the second embodiment is attached to the sealing member 4 so as to be coaxial with the core 2 and rotatable with respect to the core 2. This is what we support. As the sealing member 4, a rotary ring seal made of a metal ring, rubber, a spring, or the like is used. The rotation support shaft 5 rotates relative to the cored bar 2 by means not shown. The relative rotation speed of the rotary support shaft 5 with respect to the heat transfer body 3 is determined by the rotation speed of the cored bar 2 in the second embodiment, but is freely set by making the rotation speed of the rotary support shaft 5 variable in the present embodiment. be able to. In addition, the faster the rotation speed of the rotation support shaft 5, the larger the amount of movement of the heat transfer body 3 in the core metal axis direction. As a result, the temperature uniformity of the heat roll 1 in the axial direction is improved. Other points are the same as in the second embodiment.

The heat roll 1 supports the rotation support shaft 5 so as to be rotatable relative to the core 2, so that the stirring blade 8a rotates while the core 2 is stationary or the core 2 rotates. It can be used either when the stirring blade 8a rotates in the state. Further, the rotation of the stirring blade 8a may be opposite to the rotation direction of the cored bar 2.

Furthermore, since the relative rotation speed of the stirring blade 8a with respect to the heat transfer body 3 can be freely increased, the movement amount and the movement speed of the heat transfer body 3 in the core metal axis direction can be increased. Therefore, it is possible to provide the heat roll 1 having high temperature uniformity.

In the present embodiment, an oil seal is used for the sealing member 4. In this case, a small amount of water vapor is transmitted. Therefore, when the heat transfer member 3 is mainly composed of water, it is preferable to use the heat transfer member 3 at as low a temperature as possible, and it is also preferable to use a non-volatile liquid as the heat transfer member 3.

(Embodiment 4)

As shown in FIG. 4, the heat roll 1 according to the fourth embodiment has a structure in which the flow of the heat transfer body 3 in the axial direction of the core is divided into a plurality in a cross-sectional view perpendicular to the axial direction of the core 2. It is. The heat transfer body stirring means 8 is rotatably supported by the cored bar 2 via the sealing member 4 and the rotation support shaft 5, and is arranged such that at least a part thereof contacts the heat transfer body 3 during rotation. It has a blade 8a, and a pipe-shaped heat transfer member channel forming member 10 arranged inside the cored bar 2 and outside the stirring blade 8a. It is fixed at both ends of the core 2 by means not shown. When the cored bar 2 rotates by means not shown, the stirring blade 8a also rotates in the same way, and the heat transfer body 3 inside the heat transfer body flow path forming member 10 moves in the direction of the arrow shown in FIG. Thereby, the heat transfer member 3 outside the heat transfer member channel forming member 10 moves in the direction of the arrow shown in FIG. That is, the flow direction of the heat transfer member 3 is opposite to the core metal shaft direction between the inside and the outside of the heat transfer passage forming member 10. Other points are the same as in the second embodiment.

In the heat roll 1 shown in FIGS. 1, 2, and 3, a flow of the heat transfer body 3 in the axial direction of the core occurs, but, for example, when the heat transfer body 3 moves rightward, Heat exchanger 3 Is moving to the left. In this case, at least somewhere, the rightward flow and the leftward flow of the heat transfer body 3 may collide with each other, and the heat transfer body 3 may not be smoothly moved. On the other hand, in the present heat roll 1, the flow of the heat transfer body 3 flows from the left side in the axial direction of the metal core (one end side in the axial direction) to the right side in the axial direction (the other end side in the axial direction) and from the right side in the axial direction. Since it is clearly divided into the flow to the left, the circulation of the heat transfer body 3 in the core 2 can be performed smoothly. As a result, it is possible to provide the hot-hole 1 having a uniform temperature.

In the present embodiment, the heat-transfer-channel forming member 10 is fixed at both ends of the metal core 2, but this is fixed to the rotation support shaft 5, the stirring blade 8 a or the sealing member 4. No problem. Further, the heat transfer channel forming member 10 may be formed simultaneously with the stirring blade 8a by the same method.

Further, in the present embodiment, the stirring blade 8a is provided inside the heat transfer member channel forming member 10; however, the stirring blade 8a may be provided outside the heat transfer member channel forming member 10. Absent. Further, a water-repellent film may be formed on the inner peripheral surface or the outer peripheral surface of the heat transfer member flow path forming member 10 to improve the mobility of the heat transfer member 3.

(Embodiment 5)

As shown in FIG. 5, the heat roll 1 according to the fifth embodiment has a plurality of flows of the heat transfer body 3 in the axial direction of the core in the cross-sectional view perpendicular to the axial direction of the core 2. It has a different configuration from the heat roll according to the fourth embodiment. The heat roll 1 differs from the heat roll of Embodiment 4 in that the heat transfer passage forming member 10 is eliminated and the shape of the stirring blade 8a is changed. In FIG. 5, a stirring plate 8d made of stainless steel having a thickness of 0.2 mm is used as a heat transfer body stirring means. The center of the stirring plate 8 d is wider than both ends, and the stirring plate 8 d is attached to be inclined with respect to the axis of the hot roll 1. The both ends of the stirring plate 8 d are bent and fixed to the core 2 at the bent portions. Thereby, the space A and the space B shown in FIG. 5 can be formed in the cored bar 2. FIG. 6 is a perspective view showing in detail the shape and mounting state of the stirring plate 8d. FIG. 6 shows only the stirring plate 8 d and the core 2 for simplicity. The reason why the central portion of the stirring plate 8 d is widened is that the stirring plate 8 d is well aligned with the inside of the cored bar 2 when the stirring plate 8 d is installed at an angle. At this time, stir plate 8 d The gap between the metal core 2 and the metal core 2 depends on the heat transfer body 3 used, but is preferably within 0.5 orchid. Fig. 5 (a) shows the state in which the movement of the heat transfer body 3 has stopped in this state, and Fig. 5 (b) shows that the heat roll 1 is instantaneously rotated 180 degrees from the state of Fig. 5 (a). The state immediately after, Fig. 5 (c) is a state where a little time has passed from the state of Fig. 5 (b), and the state where the time has further passed and the movement of the heat transfer body 3 has been completed is shown in Fig. 5 (d). It is. In FIG. 5 (b), since the liquid level on the left and right is different, the heat transfer body 3 moves in the direction of the arrow due to gravity. After a short time, the state is as shown in Fig. 5 (c), and after a further time, the state is as shown in Fig. 5 (d). Thereby, the heat transfer body 3 can be moved in the axial direction of the metal core. Further, when the state shown in FIG. 5 (d) is rotated 180 degrees to the state shown in FIG. 5 (a), the illustration is omitted, but the state shown in FIG. The same movement occurs as in the state of). Therefore, by rotating the hot-hole 1, a unidirectional flow of the heat transfer body 3 can be formed in the space A and the space B, respectively. Other points are the same as in the first embodiment.

Therefore, in the present embodiment, similarly to the fourth embodiment, the flow of the heat transfer body 3 is made to flow from the left side in the axial direction of the metal core to the right side in the axial direction and from the right side in the axial direction to the left side in the axial direction by very simple means. And the circulation in the core 2 of the heat transfer body 3 can be performed smoothly. This makes it possible to provide the heat roll 1 having a uniform temperature.

Note that a water-repellent film may be formed on the outer surface of the stirring plate 8d to improve the mobility of the heat transfer body 3.

(Embodiment 6)

As shown in FIG. 7, the heat roll 1 according to Embodiment 6 has a structure that is bilaterally symmetrical about a central portion in the axial direction. The first and second stirring blades 8 aa and 8 ab have opposite blade directions. When the heat roll 1 is rotated by means not shown, the rotation support shaft 5 also rotates, and accordingly, the first and second stirring blades 8aa and 8ab also rotate. When the first stirring blade 8 aa rotates, the heat transfer member 3 inside the first heat transfer passage forming member 10 a moves in the direction of the arrow shown in FIG. 7, and when the second stirring blade 8 ab rotates, the second heat transfer member 3 moves. 2 Heat transfer passage forming member 10 b Heat transfer inside 3 b Move in the direction. With these movements, the heat transfer bodies 3 outside the first and second heat transfer path forming members 10a and 10b move as indicated by arrows in FIG. Thereby, the flow of the heat transfer body 3 can be made symmetrical with respect to the central portion in the core metal axis direction. That is, in a cross-sectional view parallel to the axial direction of the metal core 2, the flow of the heat transfer body 3 in the axial direction of the metal core can be divided into a plurality. Other points are the same as in the fourth embodiment. Many objects to be made uniform in temperature by using the heat roll 1 have a symmetrical shape and temperature unevenness occurs symmetrically in many cases. When the temperature of the object is made uniform, the internal structure of the cored bar 2 is divided into two parts at the center in the axial direction, and the heat transfer body 3 is moved through the inside, as in the present embodiment. Thereby, the temperature can be made uniform while the amount of movement of the heat transfer body 3 is small. Thereby, according to the present embodiment, the temperature equalizing ability of the heat roll 1 can be improved.

In the present embodiment, two stirring blades 8a and two heat transfer passage forming members 10 of the fourth embodiment are provided, but as shown in FIG. 8, the stirring plate 8d of the fifth embodiment is provided. A configuration including two may be used.

Further, in the present embodiment, the flow of the heat transfer body 3 is divided into two at the center part in the axial direction of the metal core, but this is divided into three or more in accordance with the object to be temperature uniformized. It does not matter. Furthermore, divisions that are not symmetrical may be used.

(Embodiment 7)

As shown in FIG. 9, the heat roll 1 according to the seventh embodiment uses water 3 a and metal balls 3 b as the heat transfer body 3. The metal sphere 3b is made of copper from the viewpoint of thermal conductivity, and preferably has a diameter of 0.5 mm to 3 mm. In the present embodiment, a metal sphere having a diameter of 0.8 mm is used. Further, the mixing ratio of the water 3a and the metal sphere 3b is preferably 0.2 to 2 for copper with respect to water 1 by mass ratio. In the present embodiment, the mixing ratio is assumed to be water: copper = 1: 1. I have. When the heat roll 1 is rotated, the metal balls 3b and the water 3a move in the axial direction of the metal core, and the temperature of the heat roll 1 is made uniform. Other points are the same as in the fifth embodiment.

In the present embodiment, since the heat transfer body 3 includes a metal having good thermal conductivity, the amount of heat transfer between the metal core 2 and the heat transfer body 3 can be improved, and the temperature uniformity can be improved. A higher hot-hole 1 can be provided. In the present embodiment, a composite product of a liquid (water 3 a) and a metal (metal sphere 3 b) is used as the heat transfer body 3, but a composite using only a metal may be used. In this case, the metal is typically hundreds. Since C is a solid, the core 2 can be sealed with a simple sealing member 4. When only metal balls are used as the heat transfer body 3, the metal spheres 3b are easily charged, and therefore, the heat transfer body 3 (metal spheres 3b) is difficult to move. It is preferable to provide a neutralization means for moderately neutralizing 3b. When the heat transfer body 3 is made of only metal, the heat transfer body 3 may be a larger metal block instead of the metal sphere 3b.

(Embodiment 8)

As shown in FIG. 10, the heat roll 1 according to the eighth embodiment is different from the hot roll 1 according to the fifth embodiment in that the heat transfer body 3 is changed from a water-based material to a non-volatile silicone oil. In addition, the sealing member 4 is provided with an atmosphere communication portion 11 for communicating the outside (atmosphere) of the core 2 with the inside of the core 2. KF54 manufactured by Shin-Etsu Chemical Co., Ltd. was used as the silicone oil. The atmosphere communication portion 11 is formed in a shaft core portion of the rotation support shaft 5 so as to extend in the axial direction. The volume ratio of the heat transfer body 3 with respect to the entire space volume in the heat roll 1 is set to 30% so that the liquid level is always lower than the atmosphere communication portion 11. Thereby, it is possible to prevent the heat transfer body 3 from spilling from the air communication portion 11. The hole diameter of the air communication part 11 is 0.5 mm.

According to the present embodiment, the sealing by the sealing member 4 may be such that the liquid does not leak, and the cost of the heat roll 1 can be reduced. Further, even when the temperature of the heat roll 1 rises and the internal pressure of the heat roll 1 increases, the pressure can always be released by the air communication section 11, so that the pressure does not increase and the heat roll 1 does not rise. The design can be simplified. Further, even when the temperature of the heat roll 1 becomes abnormally high, the pressure can always be released even when the temperature is abnormally high.

The heat transfer body 3 is not limited to silicone oil and may be any other liquid as long as it is non-volatile and has heat resistance enough to withstand the operating temperature of the heat roll 1. (Embodiment 9)

As shown in Fig. 11, reference numeral 2 indicates an outer diameter of 20 thighs, a wall thickness of 0.5 mm, and a length of 250 hires. 8792

24 This is a hollow circular cored bar made of luminium, in which a heat transfer body 3 made of liquid is sealed and held. The inner peripheral surface of the cored bar 2 is subjected to a silicone-based or fluorine-based water-repellent treatment. Reference numeral 4 denotes a sealing member that seals both ends of the metal core 2 so that the heat transfer body 3 does not flow out, and includes an outer ring 4a made of aluminum and an inner ring 4b made of phenol resin having good heat resistance. Have. Further, a metal film 4c is formed on a surface of the inner ring 4b on the side in contact with the heat transfer body 3. Further, a rotation support shaft 5 made of metal such as stainless steel and supporting the rotation of the cored bar 2 is press-fitted into the inner ring 4b. The rotation support shaft 5 extends outward from the inner race 4b in the axial direction of the metal core. The sealing member 4 is joined to the core 2 by welding. Thereby, even if the heat transfer body 3 evaporates, the core 2 can be completely sealed. Reference numeral 6 denotes a stirrer held in the cored bar 2, which has an elliptical cross section, and is provided with a chrome plating layer as a coating layer 6b around an iron core 6a. As the coating layer 6b, not only a metal but also a fluorine-based resin, for example, can be used. Reference numeral 7a is a magnetic field forming member that is disposed outside the cored bar 2 and made of a magnet, and may be any of a fluoride-based, a rare-earth-based, a plastic-based permanent magnet obtained by mixing them with a resin, and an electromagnet. In this embodiment, a ferrite-based permanent magnet is used from the viewpoint of cost. The magnetic field forming member 7a is supported by a holding table 7b and a ball screw 7c disposed outside the metal core 2 so as to reciprocate in the core metal axis direction. The ball screw 7 c extends in the axial direction along the core 2. The magnet 7a, the holding table 7b and the ball screw 7c constitute a magnetic field changing means, and the stirrer 6 and the magnetic field changing means constitute a heat transfer body stirring means.

The heat transfer body 3 is mainly composed of water, and has an antifoaming agent added thereto. As the defoaming agent, a silicone emulsion type or a self-emulsifying type is preferably used. In the present embodiment, an emulsion type KM98 (manufactured by Shin-Etsu Chemical Co., Ltd.) is used, and the amount of addition is 10 ppm. By the way, the use of a surfactant to reduce the surface tension of water and improve the fluidity of the heat transfer body 3 was also studied, but in this case, the flow of the heat transfer body 3 was hindered by the generation of bubbles. For this reason, in the present embodiment, an antifoaming agent is used as described above. Further, the amount of the heat transfer body 3 to be enclosed is preferably 10% to 80% of the total volume of the space inside the cored bar 2, more preferably 30% to 60%. In this embodiment, PT / JP2004 / 008792

In 25, the volume is 50%.

Next, the operation will be described. First, let us consider a state where the axial temperature of the cored bar 2 varies. At this time, the temperature of the heat transfer body 3 in the axial direction of the core metal also varies. Here, the ball screw 7c is rotated in the direction of the arrow shown in FIG. 11 by driving means (not shown). Then, the holding table 7b moves in the direction of the arrow shown in FIG. 11 while holding the magnetic field forming member 7a. Along with this movement, the stirrer 6 also moves in the direction of the arrow shown in FIG. 11 by the magnetic force with the magnetic field forming member 7a. With this movement, the heat transfer body 3 also flows in the core axis direction. This flow agitates the heat transfer body 3 in the axial direction of the metal core.

In the present heat roll 1, the heat transfer body 3 is stirred by the movement of the stirrer 6 in the core metal axis direction, and the heat transfer bodies 3 of different temperatures are mixed to form the heat transfer body 3 of uniform temperature. Thereby, the temperature of the cored bar 2 can be made uniform in the axial direction, and the temperature of the member brought into contact with the heat roll 1 can be made uniform. In this configuration, unlike the so-called heat pipe, which transfers latent heat due to vaporization and liquefaction of the heat transfer body 3, the heat transfer body 3 itself having a temperature difference is stirred, and the heat is thereby transferred. As long as stirring is performed sufficiently, the limit of heat transfer in the axial direction of the metal core is almost determined only by the limit of heat transfer from the metal core 2 to the heat transfer body 3. Further, in the present configuration, the stirrer 6 is moved by the magnetic force, and thereby the heat transfer body 3 is moved. Therefore, the heat transfer body 3 is easily moved as compared with the case where the heat transfer body 3 is moved only by the surface tension. Therefore, it is possible to provide the heat roll 1 having a more uniform temperature than the conventional heat pipe.

The core 2 is made of a non-magnetic material. Thus, the magnetic field formed by the stirrer 6 and the magnetic field forming member 7a is not weakened by the cored bar 2. Therefore, since the force can be sufficiently transmitted to the stirrer 6, the stirrer 6 can be reliably moved. Therefore, the heat transfer body 3 can be favorably stirred. Further, the stirrer 6 is provided with a coating layer 6b. Thereby, even when the stirrer 6 itself becomes high temperature or when the temperature around the stirrer 6 becomes high, the initial characteristics can be maintained without corroding the stirrer 6. Therefore, the stirrer 6 can be moved in a stable state over a long period of time. Liquid is used as the heat transfer body 3. Thereby, a sufficient contact area between the core metal 2 and the heat transfer body 3 can be ensured, and heat can be sufficiently transmitted between the core metal 2 and the heat transfer body 3. Therefore, the heat roll 1 having high temperature uniformity can be obtained.

The ratio of the volume of the heat transfer body 3 to the total volume of the space in the cored bar 2 is set to 10% or more and 80% or less. Here, if the volume ratio of the heat transfer body 3 is small, it is not possible to secure a sufficient contact area between the heat transfer body 3 and the core 2, and thus heat transfer between the core 2 and the heat transfer body 3. Is not done enough. Conversely, if the volume ratio of the heat transfer bodies 3 is too large, it is difficult for the heat transfer bodies 3 to move smoothly in the cored bar 2 and it is difficult for the heat transfer bodies 3 having different temperatures to mix. In the present embodiment, since the heat conductor 3 having an appropriate volume ratio is sealed, efficient heat conduction is possible, and the temperature of the heat roll 1 can be made uniform efficiently.

The core 2 has an atmosphere communicating means 9 for communicating the outside (atmosphere) of the core 2 with the inside of the core 2, and the atmosphere communicating means 9 is normally in a non-communication state at normal times. On the other hand, the communication is set only when the temperature of the heat roll 1 rises abnormally and the pressure inside the heat roll 1 rises abnormally. As a result, even if the temperature of the heat roll 1 becomes abnormally high beyond its use temperature and the pressure inside the heat roll 1 increases, in that case, the vaporized vapor by the atmospheric communication means 9 is discharged to the outside, Hot port-can reduce the pressure inside 1 Therefore, it is possible to prevent the danger caused by the destruction of the hot-hole 1.

Further, the atmosphere communication means 9 is composed of a portion where the thickness of the cored bar 2 is thinner than other portions. In other words, if the temperature of the heat roll 1 rises abnormally due to a trouble and the pressure inside the heat roll 1 rises abnormally, the thin part of the core 2 is broken first. Therefore, the mode of destruction can be controlled by a very simple means, and the danger associated with destruction of the heat roll 1 can be prevented.

The main component of the heat transfer body 3 is water, and at least a part of the portion of the core metal 2 in contact with the heat transfer body 3 is subjected to a water-repellent treatment. It becomes difficult to form the thin film of 3. Thereby, good heat transfer between the cored bar 2 and the heat transfer body 3 can be maintained. Further, the main component of the heat transfer body 3 is water, and since an antifoaming agent is added to the water, even in this case, a thin film of the heat transfer body 3 is not formed on the cored bar 2. . Therefore, good heat transfer between the core metal 2 and the heat transfer body 3 can be maintained.

In the present embodiment, as the heat transfer element 3, a substance obtained by adding an antifoaming agent to water is used. However, this may be water alone, and a liquid other than water, for example, methanol, ammonia And so on.

Further, in the present embodiment, a part of the end of the cored bar 2 is made thinner as the atmosphere communication means 9, but this may be a part of the sealing member 4 made thinner. Further, a pressure relief valve, a pressure adjusting valve, or the like provided on the cored bar 2 or the sealing member 4 may be used. In this case, even if the air communication means 9 operates, if the temperature decreases and the internal pressure decreases, the heat roll 1 can be used again.

Further, in the present embodiment, a magnetic material is used for the stirrer 6 and a magnet is used for the magnetic field forming member 7a. However, the stirrer 6 may be a magnet, and the magnetic field forming member 7a may be a magnetic material. Furthermore, both the stirrer 6 and the magnetic field forming member 7a may be magnets.

(Embodiment 10)

As shown in FIG. 12, in the heat roll 1 according to the tenth embodiment, the stirrer 6 also serves as the heat transfer body 3. The difference between the ninth embodiment and the ninth embodiment is that the heat transfer body 3 is eliminated and the stirrer 6 is changed. The stirrer 6 is made of nickel, its shape is spherical, and many of it are used. The diameter of the stirrer 6 is preferably 0.5 mm to 3 mm. In the present embodiment, the diameter of the stirrer is used. Nickel is preferred as the stirrer 6 because it is resistant to corrosion and is a ferromagnetic material.

With this configuration, similarly to the ninth embodiment, the ball screw 7c is rotated in the direction of the arrow shown in FIG. Then, the holding table 7b moves in the direction of the arrow shown in FIG. 12 while holding the magnetic field forming member 7a. Along with this movement, the stirrer 6 also moves in the direction of the arrow shown in FIG. 12 by the magnetic force with the magnetic field forming member 7a. At this time, the stirrers 6 having different temperatures are mixed, and the temperature of the heat roll 1 can be made uniform.

As described above, the stirrer 6 also serves as the heat transfer body 3, so that the number of components of the heat roll 1 can be reduced, and thus the cost of the heat roll 1 can be reduced. In the present embodiment, a large number of stirrers 6 are used, but by reducing the amount, almost all the stirrers 6 move in the same manner as the magnetic field forming member Ίa moves. You may do it. Also at this time, the movement of the stirrer 6 can move the heat of the metal core 2 in the axial direction, so that the temperature of the heat roll 1 can be made uniform.

In addition, only one stirrer 6 is provided, and the temperature of the hot roll 1 can be made uniform only by the movement thereof. In this case, in order to secure a contact area between the cored bar 2 and the stirrer 6, the shape of the stirrer 6 is preferably cylindrical.

(Embodiment 11)

As shown in FIG. 13, in the heat roll 1 according to the embodiment 11, the flow of the heat transfer body 3 in the axial direction of the core 3 is divided into a plurality in a cross-sectional view perpendicular to the axial direction of the core 2. It is. The present embodiment is different from the ninth embodiment in that a pipe-shaped heat transfer path forming member 10 is provided inside the cored bar 2 and outside the stirrer 6. The heat transfer passage forming member 10 is a stainless steel pipe having an outer diameter of 14 thighs and a wall thickness of 0.3.

When the stirrer 6 moves in the direction of the arrow shown in FIG. 13, the heat transfer body 3 inside the heat transfer path forming member 10 moves in the direction of the arrow shown in FIG. Thereby, the heat transfer member 3 outside the heat transfer member channel forming member 10 moves in the direction of the arrow shown in FIG. That is, the flow direction of the heat transfer body 3 is opposite to the direction of the core metal shaft between the inside and the outside of the heat transfer passage forming member 10.

In the heat roll 1 shown in Fig. 11, a flow of the heat transfer body 3 in the axial direction of the core occurs. For example, if the heat transfer body 3 moves to the right, somewhere Is moving to the left. In this case, at least somewhere, the rightward flow and the leftward flow of the heat transfer body 3 may collide with each other, making it difficult for the heat transfer body 3 to move smoothly. On the other hand, in the present heat roll 1, the flow of the heat transfer body 3 is clearly divided into a flow from the left side in the axial direction of the metal core to the right side in the axial direction and a flow from the right side in the axial direction to the left side in the axial direction. Therefore, the circulation of the heat transfer body 3 in the core 2 can be performed smoothly. This makes it possible to provide the heat roll 1 having a more uniform temperature.

In the present embodiment, the stirrer 6 is provided inside the heat-transfer-path forming member 10. However, the stirrer 6 may be provided between the cored bar 2 and the heat transfer path forming member 10. In this case, it is preferable that the cross-sectional shape of the stirrer 6 is adjusted to the shape of the gap between the cored bar 2 and the heat transfer passage forming member 10.

Further, a water-repellent film may be formed on the inner peripheral surface or the outer peripheral surface of the heat transfer member flow path forming member 10 to improve the mobility of the heat transfer member 3.

(Embodiment 12)

As shown in FIG. 14, the heat roll 1 according to Embodiment 12 differs from Embodiment 9 in that it includes a stirrer 6 and two magnetic field changing means 7. The ball screw 7c is configured so that the direction of the thread is symmetrical with respect to the axial center. When the ball screw 7c is rotated in the direction of the arrow shown in FIG. 14, the two magnetic field changing means 7, 7 move in the direction of the arrow shown in FIG. 14, respectively. 6 also moves in the direction of the arrow shown in FIG. With the movement of the stirrers 6, 6, the heat transfer body 3 moves in the direction of the arrow shown in FIG. Thus, the flow of the heat transfer body 3 can be made symmetrical with respect to the central portion in the core metal axis direction. That is, in a cross-sectional view parallel to the axial direction of the core 2, the flow of the heat transfer body 3 in the axial direction of the core 3 can be divided into a plurality. Further, by reciprocating the magnetic field changing means 7, the symmetric flow of the heat transfer body 3 can be continuously repeated.

Many objects to be made uniform in temperature by using the heat roll 1 have a symmetrical shape and temperature unevenness occurs symmetrically in many cases. In order to make the temperature of the object uniform as described above, as in the present embodiment, the structure of the heat roll 1 is made symmetrical with respect to the center in the axial direction, and the heat transfer body 3 is moved in the inside. Thereby, the temperature can be made uniform while the amount of movement of the heat transfer body 3 is small. Thus, according to the present embodiment, the temperature uniformity of the heat roll 1 can be improved.

In the present embodiment, when the right stirrer 6 of the two stirrers 6 moves to the right, the left stirrer 6 moves to the left. When 6 moves to the right, the left stirring bar 6 may also move to the right.

Further, in the present embodiment, the flow of the heat transfer body 3 is divided into two at the center of the axial direction of the cored bar, but this is divided into three or more in accordance with the object to be temperature uniformized. Can be I don't know. Furthermore, divisions that are not symmetrical may be used.

Also, the core metal 2 is used to prevent the combination of the stirrers 6, 6 and the magnetic field changing means 7, 7 from being destroyed, and to prevent the two stirrers 6, 6 from being moved by one of the magnetic field changing means 7. A restricting means for restricting the movement of the stirrer 6 may be provided at the central portion in the axial direction.

(Embodiment 13)

As shown in FIG. 15, the heat roll 1 according to the embodiment 13 uses the water 3 a and the metal sphere 3 b as the heat transfer body 3. The metal sphere 3b is made of copper from the viewpoint of thermal conductivity, and the diameter of the sphere is preferably 0.5 mm to 3 mm. In the present embodiment, a ball having a diameter of 0.8 thigh is used. . Further, the mixing ratio of the water 3a and the metal sphere 3b is preferably 0.2 to 2 with respect to water in terms of mass ratio of copper, and in the present embodiment, the mixing ratio is water: copper = 1: It is assumed to be 1. When the heat roll 1 is rotated, the metal balls 3b and the water 3a move in the axial direction of the metal core, and the temperature of the heat roll 1 is made uniform. The other points are the same as in the ninth embodiment.

In the present embodiment, since the heat transfer body 3 includes the metal spheres 3 b having good heat conductivity, the heat transfer amount between the cored bar 2 and the heat transfer body 3 can be improved, and the temperature uniformity can be improved. It is possible to provide a heat roll 1 having a higher capacity.

In the present embodiment, a composite product of a liquid (water 3 a) and a metal (metal sphere 3 b) is used as the heat transfer body 3, but it may be one using only a metal. In this case, the metal is typically hundreds. Since C is a solid, the core 2 can be sealed with a simple sealing member 4. When only metal balls are used as the heat transfer body 3, the metal spheres 3b are easily charged, and therefore, the heat transfer body 3 (the metal spheres 3b) is difficult to move. It is preferable to provide a neutralization means for moderately neutralizing 3b. Further, when the heat transfer body 3 is made of only metal, the heat transfer body 3 may be a larger metal work instead of the metal sphere 3b.

(Embodiment 14)

As shown in FIG. 16, the heat roll 1 according to Embodiment 14 differs from Embodiment 13 in that the stirrer 6 also serves as the metal ball 3b. As in the tenth embodiment, the stirrer 6 is made of nickel and spherical in shape, and a large number of 04 008792

31 The diameter of the stirrer 6 is preferably 0.5 thigh to 3ππη, and in the present embodiment, a diameter of 1 mm is used.

In the present embodiment, the stirrer 6 (the metal sphere 3 b) moves more smoothly by using the stirrer 6 as the metal sphere 3 b than in the case of moving the metal sphere 3 b by moving the stirrer 6. be able to. Therefore, the amount of heat transfer between the cored bar 2 and the heat transfer body 3 can be improved, and the heat roll 1 with higher temperature uniformity can be provided.

(Embodiment 15)

As shown in FIG. 17, the heat roll 1 according to Embodiment 15 is different from the heat roll 1 of Embodiment 9 in that the heat transfer member 3 is made of a non-volatile silicone film formed from water as a main component. In addition, the sealing member 4 is provided with an atmosphere communication portion 11 for communicating the outside (atmosphere) of the core 2 and the inside of the core 2 with the sealing member 4. KF54 manufactured by Shin-Etsu Chemical Co., Ltd. was used as the silicone oil. The atmosphere communication portion 11 is formed on the shaft core of the rotation support shaft 5 so as to extend in the axial direction. The volume ratio of the heat transfer body 3 to the total space volume in the heat roll 1 is set to 30% so that the liquid level is lower than the air communication portion 11. Thereby, it is possible to prevent the heat transfer body 3 from spilling out of the air communication portion 11. The hole diameter of the air communication part 11 is 0.5 thigh.

According to the present embodiment, the sealing by the sealing member 4 may be such that the liquid does not leak, and the cost of the heat roll 1 can be reduced. In addition, when the heat roll 1 is used, even when the temperature rises and the pressure rises, the pressure can always be released by the air communication section 11, so that the pressure does not rise and the heat roll 1 Design can be facilitated. Further, even when the temperature of the heat roll 1 becomes abnormally high, the pressure can always be released even when the temperature is abnormally high.

The heat transfer body 3 is not limited to silicone oil and may be any other liquid as long as it is non-volatile and has heat resistance enough to withstand the operating temperature of the heat roll 1. (Embodiment 16)

As shown in FIG. 18, a fixing device according to Embodiment 16 includes the hot hole 1 according to Embodiment 5. Reference numeral 1 2 denotes a heating roll, which is an aluminum plate having a thickness of 3 mm. A flexible layer 12b made of 1mm thick silicone rubber and a release layer made of 0.5mm thick polytetrafluoroethylene resin (PTFE) on a base 12a 1 2c is formed. The heating roll 12 is rotatably supported at both ends by means not shown. Reference numeral 13 denotes a halogen lamp, which is disposed inside the heating roll 12 and is energized by means (not shown) based on a temperature detected by a temperature sensor 14 composed of a thermocouple or the like. Heat to the temperature and keep it warm. In the present embodiment, the heat retaining temperature of the heating roll 12 is set to 170 ° C. Reference numeral 15 denotes a pressure roll, and a release layer 16 made of a polytetrafluoroethylene resin (PTFE) having a thickness of 0.05 mm was formed on the hot roll 1 according to the fifth embodiment. Things. Further, the heating roll 12 and the pressure roll 15 are pressed with a desired force by means not shown. Reference numeral 17 denotes a recording paper, and a toner image 18 is formed on a surface in contact with the heating port 12 by means not shown. The toner image 18 can be fixed to the recording paper 17 by passing the recording paper 17 through a nip formed by the heating port 12 and the pressure roll 15.

Here, since the heating port 12 and the pressurizing port 15 are supported at both ends, heat escapes from both ends, thereby causing uneven temperature in the axial direction of the heating roll 12. Occurs. In some cases, different sizes of recording paper 17 are used. For example, when recording paper 17 of small width is used continuously, the temperature of both ends of the heating roll 12 not in contact with the recording paper 17 becomes higher than the axial center, and the temperature of the heating roll 12 becomes higher. Irregularities occur. These uneven temperatures are a major cause of uneven fixing and poor fixing.

When the temperature of the heating roll 12 is made uniform in the axial direction, a method of increasing the cross-sectional area of the base material 12a of the heating roll 12 to improve heat conduction is usually employed. According to the method of increasing the cross-sectional area, the temperature can be made uniform to some extent. However, in this case, the heat capacity increases, the warm-up time increases, and the energy required for keeping the heat increases, which is not preferable. In the present embodiment, instead of increasing the cross-sectional area of the member to cause heat transfer by heat conduction of the member to make the temperature uniform, the physical transfer inside the heat roll 1 of the heat transfer body 3 is performed. The temperature is made uniform by moving the heat by the appropriate movement. Therefore, increase in heat capacity is suppressed However, the amount of heat transfer can be increased. Thereby, it is possible to provide a fixing device having the heat roll 1 with a uniform temperature, in which an increase in warm-up time and an increase in energy required for keeping the temperature are suppressed.

The main component of the heat transfer body 3 used for the heat roll 1 is water, which basically does not ignite. Thus, even in the event of an abnormality, the danger of ignition of the heat transfer body 3 can be reduced, and a highly safe fixing device can be provided.

Note that, in the present embodiment, a material mainly containing water was used as the heat transfer member 3, but the heat transfer member 3 has a flash temperature T 2 ° C higher than the set temperature T 1 ° C of the heating roll 12. As long as the temperature is higher than 50 ° C, it can be used safely. As the heat transfer body 3, for example, a silicone oil (K F54 (flash temperature: 31.5 ° C. or more) manufactured by Shin-Etsu Chemical Co., Ltd.) or the like can be preferably used.

In the present embodiment, the heat roll 1 according to the fifth embodiment is used as the heat roll 1, but any of the heat rolls 1 according to the first to fifteenth embodiments may be used. Here, the details of the magnetic field changing means 7 of the heat roll 1 when any of the heat rolls 1 according to Embodiments 9 to 15 are used as the heat roll 1 will be described with reference to FIG. As shown in FIG. 19, reference numeral 7 d denotes a pulley attached to the pressure roll 15, which rotates with the rotation of the pressure port 15. Reference numeral 7e denotes a pin, which is rotatably attached to the pulley 7d. The magnetic field forming member 7a is fixed to a wire 7h. The wire 7h is connected to the panel 7i. The wire 7h and the spring 7i are supported by a fixing member 7j, a fixing member 7k, a pulley 7f, and a pulley 7g. According to this configuration, when the pulley 7 d is rotated, the magnetic field forming member 7 a can reciprocate in the axial direction of the pressure roll 15. In other words, rotating motion can be converted into reciprocating motion by very simple means.

Further, in the present embodiment, the heating roll 1 is provided on the pressure roll 15, but this may be provided at another place. For example, the heating roll 1 is directly pressed against the outer peripheral surface of the heating roll 12. A configuration may be used.

Further, in the present embodiment, the halogen lamp 13 is used as a heating means for heating the heating roll 12, but the invention is not limited to this. For example, resistance heating by energization or heating by electromagnetic induction may be used. I do not care. (Embodiment 17)

As shown in FIG. 20, the fixing device according to Embodiment 17 is an endless fixing belt in which a portion in contact with the recording paper 17 is stretched by a plurality of rolls. At least one of them is the heat roll 1 according to the fifth embodiment.

Reference numeral 19 denotes a pressing roll, which comprises a shaft 19a made of stainless steel and a sponge layer 19b formed around the shaft 19a. Reference numeral 20 denotes an endless fixing belt in which a release layer 2 Ob made of polytetrafluoroethylene resin (PTFE) is formed on a base material 20a made of polyimide. Yes, it is stretched by the pressing port 19 and the heat roll 1. Reference numeral 21 denotes a reflection plate, which reflects the light of the halogen lamp 13 and irradiates the fixing belt 20 with light efficiently, and thermally converts the irradiated light onto the fixing belt 20 to fix the fixing belt 20. Heat. The halogen lamp 13 is energized by means (not shown) based on the temperature detected by the temperature sensor 14 composed of a thermocouple or the like, and the fixing belt 20 is heated and kept at a desired temperature. In the present embodiment, the heat retaining temperature of the fixing belt 20 is set to 170 ° C. In the pressure roll 15, a release layer 16 made of polytetrafluoroethylene resin (PTFE) having a thickness of 0.05 mm was formed on a base material 22 of an aluminum pipe having a thickness of 3 mm. It is. The pressing roll 19, the heating roll 1 and the pressing roll 15 are rotatably supported at both end portions thereof by means not shown. The pressing roll 19 and the pressing port 15 are pressed by a desired force via the fixing belt 20 by means not shown. Reference numeral 17 denotes a recording sheet, and a toner image 18 is formed on a surface in contact with the fixing belt 20 by means not shown. The toner image 18 is fixed on the recording paper 17 by passing the recording paper 17 through a nip formed by the fixing belt 20 and the pressure roll 15.

In the present embodiment, the fixing belt 20 is used to reduce the heat capacity and the warm-up time, and the fixing belt 20 is stretched directly on the heat roll 1 to form the fixing belt 20 with the fixing belt 20. Roll 1 is in direct contact. Therefore, the temperature uniforming ability of the heat roll 1 can be effectively utilized for the fixing device, and a fixing device having a uniform fixing temperature can be provided. In the present embodiment, the halogen lamp 13 is provided outside the fixing belt 20. However, the halogen lamp 13 may be provided inside the fixing belt 20.

In the present embodiment, one heat roll 1 is provided, but a plurality of heat rolls 1 are provided, for example, a plurality of heat rolls 1 used to stretch the fixing belt 20 are provided. Alternatively, a heat roller 1 may be provided inside and outside the fixing belt 20.

In the present embodiment, the heat roll 1 according to the fifth embodiment is used as the heat roll 1, but any of the heat rolls 1 according to the first to fifteenth embodiments may be used.

The present invention is not limited to the embodiments, and can be embodied in various other forms without departing from the spirit or main characteristics thereof.

As described above, the above-described embodiment is merely an example in every aspect and should not be interpreted in a limited manner. The scope of the present invention is defined by the appended claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention. Industrial applicability

As described above, the present invention is applied to an electrophotographic apparatus using an electrophotographic process such as a copying machine, a facsimile machine (FAX), and a printer.

Claims

The scope of the claims

1. A hollow cylindrical cored bar,

A heat transfer body held in the cored bar and movable in an axial direction of the cored bar;

A sealing member for sealing both ends of the metal core so that the heat transfer body does not flow out; and a transfer member for moving the heat transfer body in the axial direction of the metal core by rotating about the axis of the metal core. And a heating element stirring means,

The heat transfer body stirring means is rotatable integrally with the metal core without relative speed, and at least a part thereof contacts the heat transfer body while the metal core rotates around an axis. It is arranged inside the core metal,

The main support of the heat transfer body stirring means is performed at both ends of the sealing member portion or the core bar,

A heat roll, wherein the heat transfer body stirring means moves the heat transfer body in the axial direction of the cored bar.

2. The heat roll according to claim 1, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. .

3. Equipped with a rotation support shaft that supports the rotation of the metal core,

2. The heat roll according to claim 1, wherein the heat transfer body stirring means is formed integrally with the rotary support shaft.

4. A hollow cylindrical cored bar,

A sealing member that seals both ends of the metal core so that the heat transfer body does not flow out; and a rotation support that supports rotation of the metal core and is coaxial with the metal core and rotatable with respect to the metal core. Axis and

A heat transfer body stirring means for moving the heat transfer body in the axial direction of the core by relative rotation between the core and the rotation support shaft;

The heat transfer body stirring means is formed integrally with the rotary support shaft, and is arranged so that at least a part thereof contacts the heat transfer body during relative rotation between the cored bar and the rotary support shaft. Yes,

The heat transfer body stirring means moves the heat transfer body in the axial direction of the cored bar. A heat roll characterized by being constituted.

5. The heat roll according to claim 4, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. .

6. A hollow cylindrical cored bar,

A heat transfer body held in the cored bar and movable in the axial direction of the cored bar;

The heat transfer body stirring means is configured to move the heat transfer body in the axial direction of the metal core,

A heat roll, wherein a flow of the heat transfer body in an axial direction of the core metal is divided into a plurality in a cross-sectional view perpendicular to an axial direction of the core metal.

7. The heat roll according to claim 6, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. .

8. Heat transfer body stirring means

A stirring member rotatably supported and arranged so that at least a portion thereof contacts the heat transfer member during rotation;

A pipe-shaped heat transfer passage forming member disposed inside the metal core and outside the stirring member,

7. The heat roll according to claim 6, wherein the flow direction of the heat transfer body is opposite between the inside and the outside of the heat transfer passage forming member.

9. The heat roll according to claim 1, wherein, in a cross-sectional view parallel to the axial direction of the metal core, the flow of the heat transfer body in the axial direction of the metal core is divided into a plurality of pieces.

10. The heat roll according to claim 4, wherein, in a cross-sectional view parallel to the axial direction of the metal core, the flow of the heat transfer body in the axial direction of the metal core is divided into a plurality of pieces.

11. The heat roll according to claim 6, wherein, in a cross-sectional view parallel to the axial direction of the metal core, the flow of the heat transfer body in the axial direction of the metal core is divided into a plurality of pieces.

12. The heat roll according to claim 1, wherein the heat transfer body stirring means is made of a nonmetallic material.

13. The hot-air nozzle according to claim 4, wherein the heat-transfer stirring means is made of a non-metallic material.

14. The heat roll according to claim 6, wherein the heat transfer body stirring means is made of a nonmetallic material.

15. The heat roll according to claim 1, wherein the heat transfer body is made of a liquid.

16. The heat roll according to claim 4, wherein the heat transfer body is made of a liquid.

17. The heat roll according to claim 6, wherein the heat transfer body is made of a liquid.

18. The heat roll according to claim 1, wherein the heat transfer body is made of a metal.

19. The heat roll according to claim 4, wherein the heat transfer body is made of metal.

20. The heat roll according to claim 6, wherein the heat transfer body is made of a metal.

21. The heat roll according to claim 1, wherein the heat transfer body is composed of a liquid and a metal. (22. The heat roll according to claim 4, wherein the heat transfer body is composed of a liquid and a metal. roll ₍₂ 3. heat transfer proportion of the volume of the heat transfer body with respect to the total pore volume according to claim 6 heat roll _c 2 4 according. the metal core, characterized by comprising a liquid and a metal, 1 0% The heat roll according to claim 15, wherein the heat roll is 70% or less.

25. The hot roll according to claim 16, wherein a ratio of a volume of the heat transfer body to a total volume of the space in the metal core is 10% or more and 70% or less.

26. The heat roll according to claim 17, wherein a ratio of a volume of the heat transfer body to a total space volume in the cored bar is 10% or more and 70% or less.

27. The heat roll according to claim 21, wherein the ratio of the volume of the heat transfer body to the total space volume in the cored bar is 10% or more and 70% or less.

28. The heat roll according to claim 22, wherein a ratio of a volume of the heat transfer body to a total volume of space in the metal core is 10% or more and 70% or less.

29. The heat roll according to claim 23, wherein a ratio of a volume of the heat transfer body to a total space volume in the cored bar is 10% or more and 70% or less.

30. An atmosphere communicating means for communicating the outside of the core metal with the inside of the core metal is provided. The atmosphere communicating means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. The hot roll according to claim 15, characterized in that:

3 1. Atmospheric communication means for communicating the outside of the metal core with the inside of the metal core is provided. The air communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. 17. The heat roll according to claim 16, wherein:

32. Atmospheric communication means for communicating the outside of the metal core with the inside of the metal core. The air communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. The heat roll according to claim 17, wherein:

33. Atmospheric communication means for communicating the outside of the metal core with the inside of the metal core. The air communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. 21. The heat roll according to claim 21, wherein: 34. Atmospheric communication means for communicating the outside of the metal core with the inside of the metal core. The air communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. 23. The heat roll according to claim 22, wherein: 35. Equipped with an atmosphere communication means for communicating the outside of the core metal with the inside of the core metal, and the atmosphere communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. The heat roll according to claim 23, wherein:

36. The atmosphere communication means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. 30. The heat roll according to claim 30, wherein

37. The atmosphere communicating means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. 31. The heat roll according to claim 31, wherein:

38. The atmosphere communicating means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. The heat roll according to claim 32, wherein

39. The atmosphere communication means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. The heat roll according to claim 33, wherein

40. The atmosphere communication means is provided with at least one of a portion where the thickness of the cored bar is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. The heat roll according to claim 34, wherein the heat roll is provided.

4 1. The atmosphere communication means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. The heat roll according to claim 35, wherein:

4 2. The main component of the liquid constituting the heat transfer body is water,

16. The heat roll according to claim 15, wherein at least a part of a portion of the core metal that is in contact with the liquid has been subjected to a water-repellent treatment.

4 3. The main component of the liquid constituting the heat transfer body is water,

17. The heat roll according to claim 16, wherein at least a part of a portion of the core metal that is in contact with the liquid has been subjected to a water-repellent treatment.

4 4. The main component of the liquid constituting the heat transfer body is water,

18. The heat roll according to claim 17, wherein at least a part of a portion of the core metal that is in contact with the liquid has been subjected to a water-repellent treatment.

4 5. The main component of the liquid constituting the heat transfer body is water,

22. The hot-hole / hole according to claim 21, wherein a water-repellent treatment is performed on at least a part of a part of the cored bar which is in contact with the liquid.

4 6. The main component of the liquid constituting the heat transfer body is water,

23. The heat roll according to claim 22, wherein at least a part of a portion of the core metal that is in contact with the liquid has been subjected to a water-repellent treatment.

4 7. The main component of the liquid that constitutes the heat transfer body is water,

24. The heat roll according to claim 23, wherein at least a part of a portion of the core metal that is in contact with the liquid is subjected to a water-repellent treatment.

4 8. The main component of the liquid constituting the heat transfer body is water,

The hot hole according to claim 15, wherein an antifoaming agent is added to the liquid.

4 9. The main component of the liquid constituting the heat transfer body is water,

The hot roll according to claim 16, wherein an antifoaming agent is added to the liquid.

50. The main component of the liquid constituting the heat transfer body is water, The hot roll according to claim 17, wherein an antifoaming agent is added to the liquid.

5 1. The main component of the liquid constituting the heat transfer body is water,

22. The hot roll according to claim 21, wherein an antifoaming agent is added to the liquid.

5 2. The main component of the liquid constituting the heat transfer body is water,

23. The hot hole according to claim 22, wherein an antifoaming agent is added to the liquid.

5 3. The main component of the liquid constituting the heat transfer body is water,

23. The hot roll according to claim 23, wherein an antifoaming agent is added to the liquid.

5 4. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the hot roll,

The sealing member is provided with an atmosphere communicating portion that communicates between the outside of the core metal and the inside of the core metal,

16. The hot roll according to claim 15, wherein the liquid level of the liquid is lower than the air communication portion.

5 5. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the hot roll,

The sealing member is provided with an atmosphere communicating portion for communicating the outside of the core metal and the inside of the core metal,

17. The hot roll according to claim 16, wherein the liquid level of the liquid is lower than the atmosphere communication portion.

5 6. The liquid composing the heat transfer material is non-volatile within the operating temperature range of the heat roll,

18. The hot roll according to claim 17, wherein the liquid level of the liquid is lower than the air communication portion.

5 7. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the hot roll,

22. The heat roll according to claim 21, wherein the liquid level of the liquid is lower than the air communication portion.

5 8. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the heat roll,

23. The heat roll according to claim 22, wherein a liquid level of the liquid is lower than the atmosphere communication portion.

5 9. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the hot roll,

23. The heat roll according to claim 23, wherein a liquid level of the liquid is lower than the air communication portion.

60. A fixing device having a heat roll,

The heat roll,

A hollow cylindrical core,

A heat transfer member held in the core bar and movable in the axial direction of the core bar; a sealing member for sealing both ends of the core bar so that the heat transfer member does not flow out; A heat transfer body stirring means for rotating the heat transfer body in the axial direction of the metal core by rotating about a shaft,

The main support of the heat transfer body stirring means is the sealing member or both ends of the cored bar. In minutes.

A fixing device, wherein the heat transfer body stirring means moves the heat transfer body in the axial direction of the metal core.

61. The fixing device according to claim 60, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. apparatus. 6 2. A fixing device having a heat roll,

The heat roll,

A hollow cylindrical core,

A heat transfer member held in the core bar and movable in the axial direction of the core bar; a sealing member for sealing both ends of the core bar so that the heat transfer member does not flow out; A rotation support shaft that supports rotation, is coaxial with the cored bar, and is rotatable with respect to the cored bar;

63. The fixing device according to claim 62, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. apparatus. 6 4. A fixing device having a heat roll,

The heat roll,

A hollow cylindrical core,

A heat transfer member that is held in the core bar and is movable in the axial direction of the core bar; a sealing member that seals both ends of the core bar so that the heat transfer member does not flow out; A heat transfer body stirring means for rotating the heat transfer body in the axial direction of the metal core by rotating about a shaft,

The heat transfer body stirring means moves the heat transfer body in the axial direction of the cored bar. Composed,

A fixing device, wherein a flow of the heat transfer body in an axial direction of the core metal is divided into a plurality of sections in a cross-sectional view perpendicular to the axial direction of the core metal.

65. The fixing device according to claim 64, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. 66. The part in contact with the unfixed toner image on the recording paper is an endless fixing belt stretched by a plurality of rolls,

61. The fixing device according to claim 60, wherein at least one of said plurality of rolls is a heat roll.

67. The part in contact with the unfixed toner image on the recording paper is an endless fixing belt stretched by a plurality of rolls,

63. The fixing device according to claim 62, wherein at least one of the plurality of rolls is a heat roll.

68. The part in contact with the unfixed toner image on the recording paper is an endless fixing belt stretched by a plurality of rolls,

65. The fixing device according to claim 64, wherein at least one of the plurality of ports is a heat roll.

69. When the set temperature of the part in contact with the unfixed toner image on the recording paper is T 1 C and the ignition temperature of the heat transfer body is T 2 ° C, (T l + 50) <T2 61. The fixing device of claim 60.

70. Assuming that the set temperature of the part in contact with the unfixed toner image on the recording paper is T1 ° C and the ignition temperature of the heat transfer body is T2 ° C, it is (T1 + 50) less T2. 63. The fixing device according to claim 62, wherein:

71. When the set temperature of the part in contact with the unfixed toner image on the recording paper is T1 ° C, and the ignition temperature of the heat transfer material is T2 ° C, it is (T1 + 50) less T2. 65. The fixing device according to claim 64, wherein:

72. A hollow cylindrical cored bar,

A sealing member for sealing both ends of the core bar so that the heat transfer body does not flow out, Heat transfer body stirring means for moving the heat transfer body in the axial direction of the core bar, wherein the heat transfer body stirring means,

A stirrer held inside the cored bar and including at least one of a magnet and a magnetic body;

Magnetic field changing means for changing the magnetic field applied to the stirrer,

The stirrer is moved in the axial direction of the mandrel by a change in the magnetic field by the magnetic field changing means, and the heat transfer body is moved in the axial direction of the mandrel by the movement of the stirrer. A hot mouth that is characterized by that.

73. The heat according to claim 72, wherein the temperature of the heat transfer body is made uniform in the axial direction of the metal core by moving the heat transfer body, whereby the temperature of the metal core is made uniform. roll. 7 4. The magnetic field changing means

A magnetic field forming member provided outside the metal core and including at least one of a magnet and a magnetic body;

Magnetic field forming member moving means for moving the magnetic field forming member in the axial direction of the metal core,

The heat roll according to claim 72, wherein at least one of the stirrer and the magnetic field forming member includes a magnet.

75. The heat roll according to claim 74, wherein the core bar is made of a non-magnetic material. 76. The hot roll according to claim 72, wherein the stirrer includes a coating layer for preventing deterioration such as corrosion.

77. The hot roll according to claim 72, wherein the stirrer doubles as a heat transfer body. 7 8. A pipe-shaped heat transfer member forming member is provided inside the metal core and outside the stirrer, and the flow direction of the heat transfer member is reversed between inside and outside of the heat transfer member forming member. The heat roll according to claim 72, wherein the heat roll is oriented.

79. The heat according to claim 72, wherein a flow of the heat transfer body in the axial direction of the core metal is divided into a plurality in a sectional view parallel to the axial direction of the metal core. roll. 80. The heat roll according to claim 72, wherein the heat transfer body is made of a liquid.

81. The heat roll according to claim 72, wherein the heat transfer body is made of metal.

82. The heat load according to claim 72, wherein the heat transfer body is composed of a liquid and a metal. Le.

83. The hot roll according to claim 80, wherein a ratio of a volume of the heat transfer body to a total space volume in the cored bar is 10% or more and 80% or less.

8. The hot roll according to claim 82, wherein a ratio of a volume of the heat transfer body to a total volume of the space in the cored bar is 10% or more and 80% or less.

8 5. Equipped with atmosphere communication means for communicating the outside of the core metal with the inside of the core metal, and the atmosphere communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rises abnormally. The hot roll according to claim 80, wherein: 8 6. Equipped with atmospheric communication means for communicating the outside of the metal core with the inside of the metal core, and the air communication means is normally in a non-communication state, but is in a communication state only when an abnormal temperature rise occurs. The hot roll according to claim 82, wherein: 87. The atmosphere communicating means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. The heat roll according to claim 85, wherein:

8 8. The atmosphere communicating means is characterized in that it has at least one of a portion where the thickness of the core is thinner than the other portion and a portion where the thickness of the sealing member is thinner than the other portion. The heat roll according to claim 86, wherein

8 9. The main component of the liquid constituting the heat transfer body is water,

90. The hot roll according to claim 80, wherein at least a part of a portion of the core metal that is in contact with the liquid has been subjected to a water-repellent treatment.

9 0. The main component of the liquid constituting the heat transfer body is water,

The heat roll according to claim 82, wherein a water-repellent treatment is performed on at least a part of a portion of the core metal that is in contact with the liquid.

9 1. The main component of the liquid constituting the heat transfer body is water,

The hot nozzle according to claim 80, wherein an antifoaming agent is added to said liquid.

9 2. The main component of the liquid constituting the heat transfer body is water,

The hot roll according to claim 82, wherein an antifoaming agent is added to the liquid.

9 3. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the hot roll,

90. The hot roll according to claim 80, wherein the liquid level of the liquid is lower than the air communication portion.

9 4. The liquid constituting the heat transfer material is non-volatile within the operating temperature range of the hot roll,

The heat roll according to claim 82, wherein a liquid level of the liquid is lower than the atmosphere communication portion.

9 5. A fixing device provided with a heat roll,

The heat roll,

A hollow cylindrical core,

A heat transfer member held in the core bar and movable in the axial direction of the core bar; a sealing member for sealing both ends of the core bar so that the heat transfer member does not flow out; And a heat transfer body stirring means for moving the heat transfer body in the axial direction of the cored bar.

The stirrer is moved in the axial direction of the mandrel by a change in the magnetic field by the magnetic field changing means, and the heat transfer body is moved in the axial direction of the mandrel by the movement of the stirrer. A fixing device, comprising:

96. The fixing device according to claim 95, wherein the temperature of the heat transfer member is made uniform in the axial direction of the metal core by moving the heat transfer member, whereby the temperature of the metal core is made uniform. apparatus. 9 7. The endless fixing belt that is in contact with the unfixed toner image on the recording paper is stretched by a plurality of rolls. The fixing device according to claim 95, wherein at least one of said plurality of rolls is a heat roll.

98. When the set temperature of the part in contact with the unfixed toner image on the recording paper is T1 ° C and the ignition temperature of the heat transfer body is T2 ° C, (Tl + 50) <T2 95. The fixing device according to claim 95, wherein: