JP3519908B2 - Heat fixing device and heating roller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus,
The present invention relates to a heating fixing device and a heating roller for a heating fixing device used in a copying machine, a facsimile, etc., and in particular, it has a uniform temperature distribution, saves power, and is resistant to bending and crushing, and has high safety. The present invention relates to a heat fixing device and a heating roller for the same, which are expensive and have a long service life of a power feeding member.

[0002]

2. Description of the Related Art Generally, an electrophotographic apparatus, a copying machine, a facsimile and the like are provided with a heat fixing device in which a heating roller is pressed against a heating roller. In this heat fixing device,
As shown in FIG. 9, the paper 174 on which the toner 173 has been transferred is pressed by the heating roller 171 and the pressure roller 172 while rotating the heated heating roller 171, and the paper 1
Toner 173 is heated and fused on 74 to print. In order to maintain this print quality, it is necessary to keep the surface temperature of the heating roller constant within the fixing temperature.

In recent years, power consumption has been reduced by shutting off the power supply to the heating roller when the heating roller is not needed and turning on the power supply only when necessary. In this case, the surface of the heating roller needs to reach the set temperature immediately when the power is turned on.

On the other hand, in order to prevent the surface temperature from fluctuating greatly due to continuous printing and affecting the printing quality, an aluminum roller having a wall thickness of 1.5 to 3 mm is used to increase the heat capacity. Need to be bigger. Further, since a heater or the like using a halogen lamp is used for heating at a position away from the internal roller, there is a problem that a long waiting time is required until the set temperature is reached after the power is turned on. Therefore, in order to immediately set the printable state, it is necessary to always maintain a fixed fixing temperature, which causes a problem that power consumption increases.

As a method for improving the rising of the heating temperature of the heating roller, there is a heating roller by a direct heating method disclosed in Japanese Patent Laid-Open No. 6-332333. As shown in FIG. 8, this heating roller has a cylindrical substrate 16 made of alumina.
Strip-shaped resistance pattern 1 made of resistance heating material on the outer surface of 2
63 is formed, covered with a protective layer 164, and then a release layer 165 is formed on the outer surface. Further, electrode rings 166a and 166b for passing a current through the resistance pattern 163 are provided on the outer peripheral portions of both ends of the heating roller 161, and insulating washer rings 167a and 167b having a diameter larger than that of the electrode rings are provided adjacent to the electrode rings. Is configured. The heating roller 161 includes a power feeding brush 168.
By supplying current from a and 168b, Joule heat is generated in the resistance pattern 163 to heat the entire roller.

The heating roller disclosed in Japanese Unexamined Patent Publication No. 6-332333 is obtained by directly heating the roller surface.
The surface temperature is raised to the set temperature in a short time to shorten the waiting time until printing and to reduce the power consumption.

However, the heating roller having the above structure has the following problems. That is, since the heat generating layer is on the outer surface of the hollow cylindrical substrate, if the temperature rises abnormally and ignites, the heat generating layer and the printing paper are in contact with each other, which may cause a flaming flame. Even if the temperature does not rise abnormally, the release layer may be worn and peeled off for a long period of time to expose the heat generating layer, sparks may be generated due to poor contact, and the particles may be scattered on the paper and surrounding parts. Moreover, it is difficult to obtain good surface roughness on the roller surface.

Further, a release layer such as a fluororesin must be provided on the heat generating layer, but since the adhesion between the heat generating layer and the fluororesin is poor, it is difficult to maintain long-term durability.
Further, since the conductive electrode member for supplying electric power is present in the vicinity of the paper passing portion on the surface of the heating roller, there is a safety problem due to abrasion and contact failure of the sliding portion due to adhesion of foreign matter such as toner and paper powder.

Therefore, in order to solve the above problems, the present applicant has previously proposed Japanese Patent Application No. 8-139286. As shown in FIG. 10, this heat fixing device uses an aluminum base as the hollow cylindrical base 106 of the heating roller 101, and the outer surface of the hollow cylindrical base 106 having a small heat capacity directly covers the outer surface. A fluororesin release layer 109 having a thickness of up to 30 μm is formed.

On the inner surface of the hollow cylindrical substrate 106, an electric insulating layer 107 and a cylindrical heat generating layer 108 having carbon fibers as an electric resistor are laminated. The power supply member 102 is press-fitted inside the cylindrical heating layer 108. The electrical insulating layer 107 uses an alumite or an insulating fiber that also serves as a reinforcing fiber such as aramid fiber, alumina fiber, or SiC fiber.

The reinforcing fiber is obtained by winding a fiber-reinforced prepreg cut in a rectangular shape in a direction parallel to the central axis of the roller. The fiber reinforced prepreg is a composite member having a thickness of 0.1 to 0.5 mm obtained by impregnating aramid fiber, alumina fiber, SiC fiber, etc., with a heat resistant resin such as polyimide resin, bismaleimide resin, phenol resin, etc. at a predetermined ratio. Is unidirectionally heat-molded. Since the SiC fiber has conductivity, the inner surface of the hollow cylindrical substrate 106 needs to be anodized.

The heat generating layer 108 is formed by heat molding using a prepreg sheet member in which carbon fiber is impregnated with a heat resistant resin such as a polyimide resin, a bismaleimide resin or a phenol resin at a predetermined ratio. The thickness of the prepreg sheet member is 0.1 to 0.5 mm.

The carbon fiber is obtained by spirally winding a carbon fiber prepreg sheet cut into a rectangular shape on the insulating reinforcing layer. The electric resistance can be changed by changing the width of the prepreg sheet, and the amount of heat generated by the heating roller 101 can be increased or decreased.

The surface of the heat generating layer 108 is fixed to the both ends of the heat generating layer 108, and the power supply member 102 and the brush electrode 105.
The brush electrode 105 is in contact with an external conductive member 103 for supplying electric power from a power source (not shown). The external conductive member 103 is itself an elastic body or is supported by an elastic member, and is pressed against the brush electrode 105 by its elastic force. Also,
The brush electrode 105 pressed against the external conductive member 103 is
It is fixed to the power feeding member 102 with a conductive adhesive or the like.

In this heat fixing device, since the heat generating layer 108 is formed on the inner surface of the hollow cylindrical substrate 106 having a small heat capacity, the entire surface of the heating roller 101 can be uniformly and quickly heated to the set temperature. The print waiting time can be shortened and the power consumption can be reduced. Further, since the heat generating layer 108 and the power supply means are located inside the heating roller 101, even if a spark is generated due to overheating or poor contact, there is no fear of ignition of the printing paper or peripheral members. Further, since the release layer 109 is directly laminated on the outer surface of the hollow cylindrical substrate 106, it is strong against peeling and abrasion,
It can be used safely for a long time. further,
Since the electrically insulating layer 107 and the heat generating layer 108 made of carbon fiber are laminated inside the hollow cylindrical substrate 106, the specific strength and the specific elastic modulus of the entire heating roller 101 can be increased, and the strength of the heating roller 101 can be increased. The decrease can be prevented. Therefore, the heating roller 101 can be thinned.

However, in the structure described in Japanese Patent Application No. 8-139286, the conductive member 103 for supplying electric power from the outside keeps contact with the power supply member 102 inserted into the inner surface of the heating roller 101, so that the force is always applied. Is applied, the power supply member 102 is pushed by the force and gradually moves inward over time, and eventually the contact with the conductive member 103 cannot be maintained, so that the reliability of the power supply unit is improved. It may decrease.

Further, as shown in FIG. 11, when the external conductive member 103 is in contact with the power supply member 102 of the heating roller 111 from the inside, a force F is applied toward the outside, and the power supply member 102 is also moved. The reliability of the power supply unit may be lowered due to the movement to the outside and the loss of contact with the conductive member 103 eventually.

In order to solve such a problem, the present applicant has previously proposed Japanese Patent Application No. 8-142196. In this Japanese Patent Application No. 8-142196, the heating layer 121 of the heating roller 121 is provided with the convex portion 110 as shown in FIG. 12, and as shown in FIG. 15, the heating layer 1 of the heating roller 151 is provided.
58, the electrically insulating layer 157, and the hollow cylindrical substrate 156 are provided with the concave portions 156a, respectively, to thereby form the heating roller 151.
13, the hollow cylindrical substrate 136 of the heating roller 131 is folded back to form a folded-back portion 136a, which is brought into contact with the end surface of the power-feeding member 102. , Power supply member 102
As shown in FIG. 14 and a method of pressing the power feeding brush 105 from the inner side of the power feeding brush 105 with the collar portion 133a of the external conductive member 133, the collar portion 142 formed on the power feeding member 142 of the heating roller 141.
It proposes a method of preventing movement of the power feeding member 142 by bringing a into contact with the end of the heating roller 141.

[0019]

However, when a convex portion or a concave portion is formed on the inner surface of the heat generating layer, it is necessary to partially deform or remove the laminated structure such as the electric insulating layer and the heat generating layer. May cause the peeling of the laminated structure and the generation of cracks. In addition, when a separate member is installed on the inner surface of the roller to form a convex shape, it is necessary to fix the separate member to be the convex portion to the heat generation layer of carbon fiber that becomes extremely hot. In this case, since the hollow cylindrical substrate of the heat fixing device is thin as described above, the rigidity is poor and the hollow cylindrical substrate itself may be deformed by press fitting. In addition, in the case of adhesion, there is a possibility that the adhesive layer will be broken by the heat cycle and the convex member will fall off accordingly.

Further, in the method of providing the brim on the power feeding member and the method of folding the base body, since the base body is also energized, no voltage is applied to the heat generating layer, which may make temperature control difficult. Further, as shown in FIG. 14, when the insulating treatment 143 is performed between the hollow cylindrical substrate and the flange portion of the power feeding member, the creepage distance becomes insufficient, and there is a possibility that the substrate will be energized by discharge.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to prevent a stress exerting a bad influence on the laminated structure from being applied, and the power supply section has a highly reliable heat fixing device and common heating. The purpose is to provide a roller.

[0022]

In order to achieve the above object, the invention of claim 1 presses a rotatable pressure roller at a predetermined pressure to a cylindrical heating roller to which electric power is supplied through a power supply member. Then, in the heat fixing device in which the printing paper is inserted while the two rollers are rotated to fuse the toner to the printing paper, the heating roller is provided with an insulating member for positioning the power supply member, and the insulating member is It is characterized in that it is provided with a flange portion that comes into contact with the end surface of the heating roller, and is screwed to the power feeding member so as to be tightened by rotation in a direction opposite to the rotation direction of the heating roller.

In this structure, since the insulating member for positioning the power feeding member is provided, even if the power feeding member is given an external force relative to the insulating member due to friction with the external power feeding member,
The movement of the power feeding member can be prevented. Further, in this configuration, the power feeding member and the collared insulating member are screwed together and tightened by rotation in the direction opposite to the rotation direction of the heating roller, so that the power feeding member becomes the insulating member due to friction with the external power feeding member. Even if a rotational force is applied relative to it, reliable fastening is maintained, so that movement of the power feeding member can be prevented.

According to the second aspect of the present invention, a rotatable pressure roller is pressed against a cylindrical heating roller to which electric power is supplied through a power supply member at a predetermined pressure, and printing is performed while rotating these two rollers. In a heat fixing device for inserting a paper sheet and fusing toner to a printing paper sheet, the heating roller is provided with an insulating member for positioning the power supply member, and the insulating member is a flange portion that abuts an end surface of the heating roller. And a through hole formed substantially at right angles to the axial direction of the heating roller, and the power feeding member is inserted into the through hole.

In this structure, since the insulating member for positioning the power feeding member is provided, even if the power feeding member is given an external force relative to the insulating member by friction with the external power feeding member,
The movement of the power feeding member can be prevented. Further, in this configuration, the flange portion of the insulating member abuts on the end surface of the heating roller, and the power feeding member is installed in the through hole formed substantially at right angles to the axial direction of the heating roller. Therefore, the movement of the power supply member is restricted by the through hole,
The movement of the power feeding member can be prevented. Further, since the power feeding member is simply passed through the through hole, the heating and fixing device can be inexpensive.

According to a third aspect of the present invention, in the heat fixing device according to the second aspect, both end portions of the power feeding member are bent toward the end portion of the heating roller to form a bent portion, and the bent portion is the above-mentioned bent portion. It is characterized in that it is in elastic contact with the heat generating layer.

In this structure, since the power feeding member according to the second aspect is provided with the bent portions at which both ends are bent, the power feeding member can be smoothly inserted into the heating roller, and can be easily assembled. Due to the elasticity of the bent portion, reliable energization to the heat generating layer can be obtained.

The invention of claim 4 is the same as claim 2 or 3
In the heat fixing apparatus described in the paragraph 1, the insulating member is formed with a hole that is continuous in the roller axial direction from the flange side of the through hole to the end of the flange.

In this structure, since the insulating member according to the second or third aspect has a hole which is continuous with the through hole and axially penetrates, the power feeding member and the insulating member are separately inserted into the heating roller. Is possible.

According to a fifth aspect of the present invention, in the heat fixing device according to any one of the second to fourth aspects, the power supply member has a curved surface formed on a contact surface with the heat generating layer. There is.

In this structure, the contact area with the inner surface of the heat generating body can be further increased by forming the bent portion of the power feeding member inserted in the insulating member according to any one of claims 2 to 4 into a curved surface.

According to the invention of claim 6, a rotatable pressure roller is pressed against a cylindrical heating roller, to which electric power is supplied through a power supply member, at a predetermined pressure, and printing is performed while rotating these two rollers. In a heat fixing device for inserting a paper sheet and fusing toner to a printing paper sheet, the heating roller is provided with an insulating member for positioning the power supply member, and the insulating member is a flange portion that abuts an end surface of the heating roller. And a hooking portion hooked in a hole penetrating the heating roller of the power supply member in the axial direction.

In this structure, since the insulating member for positioning the power feeding member is provided, even if the power feeding member is given an external force relative to the insulating member due to friction with the external power feeding member,
The movement of the power feeding member can be prevented. Further, in this configuration, since the hole that penetrates in the axial direction of the heating roller is formed in the power feeding member and the hook portion of the insulating member is hooked in this hole, the movement of the power feeding member can be prevented. Further, by pre-assembling the power feeding member and the insulating member, the positional relationship between them is easily maintained.

According to the invention of claim 7, a rotatable pressure roller is brought into pressure contact with a cylindrical heating roller, the printing paper is nipped while the heating roller and the pressure roller are rotated, and toner is applied to the printing paper. A heating and fixing device for fusing, wherein the heating roller has a release layer on the outer surface, and carbon fibers having at least an electric insulating layer on the inner surface and electric resistance spirally arranged on the inner surface of the insulating layer. And a heat-fixing device having a power supply member at both ends of the heat-generating layer, and a conductive member for supplying power from the outside to the power-supply member is in contact with the heat-fixing device. In, a shaft member with a flange that is inserted into an axial through hole formed in the power feeding member and is attached to the conductive member, and a flange portion of the shaft member and the conductive member are installed so as to be compressed. With elastic members It is characterized in Rukoto.

In this structure, since the brush electrode and the power feeding member are in contact with each other by the shaft member with the collar and the elastic member, it is not necessary to press the brush electrode toward the power feeding member by the external conductive member, and the power feeding member is not required. Can be prevented from moving. In addition, an insulating member for securing a creepage distance from the base body is not required, and it is possible to configure the power feeding unit using easily available and inexpensive parts such as general-purpose bolts and coil springs.

Further, according to the invention of claim 8, in a cylindrical heating roller which is supplied with electric power through a power feeding member and is rotatable with a pressure roller and which is pressed against the printing paper to fuse the toner to the printing paper. , The heating roller is provided with an insulating member for positioning the power feeding member, and the insulating member is
The heating roller is provided with a collar portion that comes into contact with the end surface of the heating roller, and is screwed to the power feeding member so as to be tightened by rotation in a direction opposite to the rotation direction of the heating roller.

In this structure, since the insulating member for positioning the power feeding member is provided, even if the power feeding member is given an external force relative to the insulating member by friction with the external power feeding member,
The movement of the power feeding member can be prevented. Further, in this configuration, the power feeding member and the collared insulating member are screwed together and tightened by rotation in the direction opposite to the rotation direction of the heating roller, so that the power feeding member becomes the insulating member due to friction with the external power feeding member. Even if a rotational force is applied relative to it, reliable fastening is maintained, so that movement of the power feeding member can be prevented.

According to the invention of claim 9, a rotatable pressure roller is pressed against a cylindrical heating roller to which electric power is supplied through a power supply member at a predetermined pressure, and printing is performed while rotating these two rollers. In a heat fixing device for inserting a paper sheet and fusing toner to a printing paper sheet, the heating roller includes a release layer formed on an outer surface, an electric insulating layer formed on an inner surface of the release layer, and the electric insulating layer. A hollow cylindrical substrate having a structure in which a heating layer made of carbon fibers spirally arranged on the inner surface of the substrate is laminated, and an insulating member for positioning the power feeding member with respect to the heating layer, wherein the insulating member is the heating member. In addition to a flange portion that comes into contact with the end surface of the roller, a hook portion that is hooked in a hole that penetrates the heating roller of the power feeding member in the axial direction is provided.

With this structure, even if the power feeding member is given an external force relative to the insulating member due to friction with the external conductive member, the movement of the power feeding member can be prevented. Also,
In this structure, a hole penetrating in the axial direction of the heating roller is formed in the power feeding member, and the hook portion of the insulating member is hooked in this hole, so that the movement of the power feeding member can be prevented. Further, by pre-assembling the power feeding member and the insulating member, the positional relationship between them is easily maintained.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of a heating roller of a heat fixing device according to the first embodiment of the present invention.

The releasing layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, the brush electrode 15 and the external conductive member 13 of the heating roller 11 of the first embodiment are constructed as follows.
The release layer 109, the base 106, the electric insulating layer 107, the heat generating layer 108, the brush electrode 105, and the external conductive member 103 of the conventional example shown in FIG.

A major difference from the conventional example shown in FIG. 10 is that the insulating member 14 has a flange portion 14c that abuts against the end portion of the heating roller 11.
And the screw portions 14a and 12a formed between the insulating member 14 and the power feeding member 12 so as to be tightened by the rotation in the direction opposite to the rotation direction of the heating roller 11, respectively,
The insulating member 14 and the power feeding member 12 are joined by screwing. In addition, 14b is a play hole which fits so as not to contact the external conductive member 13.

According to this structure, the collar portion 14 of the insulating member 14 is
c hinders the inward movement of the power feeding member 12, and it becomes possible to easily secure the creepage distance from the hollow cylindrical substrate 16 to the power feeding member 12. Further, since the screw portions 12 a and 14 a are configured to be tightened by the rotation in the direction opposite to the rotation direction of the heating roller 11, the power feeding member 12 gives a rotational force to the insulating member 14 by friction with the external power feeding member 13. Even if it is tightened, the secure fastening is maintained.

FIG. 2 is a sectional view showing the main part of the heating roller of the heat fixing device according to the second embodiment of the present invention. The structure of the release layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, the brush electrode 15 and the external conductive member 13 of the heating roller 21 of the second embodiment is the same as that of the conventional example of FIG. The configurations of the layer 109, the base 106, the electrical insulating layer 107, the heat generating layer 108, the brush electrode 105, and the external conductive member 103 are basically the same.

The power feeding member 22 is inserted into the through hole 24a formed in the flanged insulating member 24 in a direction substantially perpendicular to the axial direction of the heating roller 21, and the end portion is pressed against the heat generating layer 18. is set up. The movement of the power feeding member 12 is restricted by the through hole 24a of the insulating member 24 with a collar.
Further, since the power feeding member 12 is simply passed through the through hole 24a, it can be configured with inexpensive parts.

FIG. 3 is a sectional view showing a main part of a heating roller of a heat fixing device according to the third embodiment of the present invention. The mold release layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, the brush electrode 15, and the external conductive member 13 of the heating roller 31 of the third embodiment have the mold release of the conventional example of FIG. The configurations of the layer 109, the base 106, the electrical insulating layer 107, the heat generating layer 108, the brush electrode 105, and the external conductive member 103 are basically the same.

The power feeding member 32 has the bent portion 32a formed by extending the power feeding member 12 shown in FIG. 2 and bending both ends thereof. Therefore, the heating roller 31 can be smoothly inserted into the heating roller 31, and the bent portion can be easily assembled. Reliable energization of the heat generating layer 18 by the elasticity of 32a can be obtained.

FIG. 4 is a sectional view showing a main part of a heating roller of a heat fixing device according to the fourth embodiment of the present invention. The structure of the release layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, the brush electrode 15 and the external conductive member 13 of the heating roller 41 of the fourth embodiment is the same as that of the conventional release mold of FIG. The configurations of the layer 109, the base 106, the electrical insulating layer 107, the heat generating layer 108, the brush electrode 105, and the external conductive member 103 are basically the same.

The power feeding member 32 is the power feeding member 32 shown in FIG.
Is the same as The heating roller 41 has a hole 44b which is continuous with the through hole 24a of the insulating member 24 of FIG. 3 in the axial direction and penetrates to the end of the flange 44a.
2 and the insulating member 44 can be separately inserted into the heating roller 41. Therefore, it is not necessary to pre-assemble the power feeding member 32 and the insulating member 44, the number of assembling steps is small, and the workability is high.

FIG. 5A is a sectional view showing the main part of the heating roller of the heat fixing device according to the fifth embodiment of the present invention.
(B) is the same perspective view. The release layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, the brush electrode 15, and the external conductive member 1 of the heating roller 51 of the fifth embodiment.
The configuration of No. 3 is similar to that of the conventional release layer 109 and the substrate 10 shown in FIG.
6, electric insulating layer 107, heat generating layer 108, brush electrode 10
5 and the external conductive member 103 are basically the same in configuration. The insulating member 44 is the same as the insulating member of FIG.

By making the bent portion 52a of the power feeding member 52 inserted in the insulating member 44 into a curved surface that follows the inner surface of the heat generating layer 18, the contact area with the inner surface of the heat generating layer 18 can be made larger, and as a result, 3, 4 feeding member 32
It is possible to promote more reliable energization as compared with.

FIG. 6 is a sectional view showing a main part of a heating roller of a heating and fixing device according to the sixth embodiment of the present invention. The structure of the release layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, the brush electrode 15 and the external conductive member 13 of the heating roller 61 of the sixth embodiment is the same as that of the conventional example shown in FIG. Mold layer 109, substrate 106, electrical insulating layer 107, heat generating layer 108, brush electrode 105, and external conductive member 103.
The configuration is basically the same as that of the above.

The feeding member 62 has a hole portion 62a penetrating in the axial direction of the heating roller 61, and the insulating member 64 has a hooking member 64a having an elastic portion having a claw portion 64b. Since the snap-fit structure in which the insulating member 64 is hooked and joined, the movement of the power feeding member 62 can be prevented. Further, since the positional relationship between the power feeding member 62 and the insulating member 64 is easily maintained in the sub-assembled state,
When assembling the heat fixing device, there is an advantage that the positioning work is simplified.

FIG. 7 is a sectional view showing a main part of a heating roller of a heat fixing device according to the seventh embodiment of the present invention. The structure of the release layer 19, the hollow cylindrical substrate 16, the electric insulating layer 17, the heat generating layer 18, and the external conductive member 13 of the heating roller 71 of the seventh embodiment is the release layer 109 of the conventional example of FIG.
The configurations of the base 106, the electrical insulating layer 107, the heat generating layer 108, and the external conductive member 103 are basically the same as each other.

Since the brush electrode 75 and the power feeding member 72 are pressed against each other by the flanged shaft member 73 and the elastic member 74, the power feeding member 72 is fixed to the power feeding member 72 even though the brush electrode 75 is pressure-bonded to the power feeding member 72. The force does not act only from one side, and the movement of the power feeding member 72 can be prevented. Also,
An insulating member for securing a creepage distance from the hollow cylindrical substrate 16 is not required, and the power feeding unit can be configured with inexpensive parts such as general-purpose bolts and coil springs. The elastic member 74 may be a leaf spring, rubber or the like other than the illustrated spring.

Although the brush electrode is fixed to the power supply member on the heating roller side in the above embodiment, it may be fixed to the external conductive member. Moreover, you may use a carbon brush for both.

[0057]

As is apparent from the above description, according to the heat fixing device of the first aspect, the rotatable pressure roller is pressed at a predetermined pressure to the cylindrical heating roller to which electric power is supplied through the power feeding member. Then, in the heat fixing device in which the printing paper is inserted while the two rollers are rotated to fuse the toner to the printing paper, the heating roller is provided with an insulating member for positioning the power supply member, and the insulating member is The power feeding member is provided with a flange portion that comes into contact with the end surface of the heating roller, and is screwed to the power feeding member so as to be tightened by rotation in a direction opposite to the rotation direction of the heating roller, so that friction with the external power feeding member causes friction. Is able to prevent the movement of the power feeding member even when an external force is applied to the insulating member,
Even when the power feeding member is given a rotational force relative to the insulating member due to friction with the external power feeding member, reliable fastening is maintained, so that it is possible to provide a heat fixing device capable of preventing the movement of the power feeding member. .

According to the heat fixing device of the second aspect,
A rotatable pressure roller is brought into pressure contact with a cylindrical heating roller, which is supplied with electric power via a power supply member, with a predetermined pressure.
In a heat fixing device that fuses toner onto printing paper by inserting printing paper while rotating two rollers, the heating roller is provided with an insulating member that positions the power supply member, and the insulating member is the heating roller. Of the heating roller, the through hole is formed substantially at right angles to the axial direction of the heating roller, and the power feeding member is inserted into the through hole. Provided is a heating and fixing device capable of preventing the movement of the power feeding member even when an external force is applied to the insulating member relative to the insulating member and preventing the movement of the power feeding member by the through hole. can do. Further, since the power feeding member is simply passed through the through hole, the heating and fixing device can be inexpensive.

According to the heat fixing device of the third aspect,
The heat fixing device according to claim 2, wherein both ends of the power feeding member are bent toward the end of the heating roller to form a bent portion, and the bent portion elastically contacts the heat generating layer. In addition to the effect of claim 2, the power feeding member can be smoothly inserted into the heating roller, can be easily assembled, and the elasticity of the bent portion can surely supply electricity to the heat generating layer. .

According to the heat fixing device of the fourth aspect,
In the heat fixing device according to claim 2 or 3, since the insulating member is formed with a hole penetrating in the roller axial direction continuously with the through hole, in addition to the effect of claim 2 or 3, It is possible to separately insert the power feeding member and the insulating member into the heating roller. Therefore, it is not necessary to assemble the power feeding member and the insulating member in advance and then to attach them, so that it is possible to provide a heat fixing device having a small number of assembling steps and high workability.

According to the fifth aspect of the heat fixing device,
The heat fixing device according to any one of claims 2 to 4,
Since the curved surface is formed on the contact surface of the power feeding member with the heat generating layer, the contact area with the inner surface of the heat generating member can be further increased in addition to the effect according to any one of claims 2 to 4. Thus, more reliable energization can be promoted as compared with the case where the bent portion is flat.

According to the heat fixing device of the sixth aspect,
A rotatable pressure roller is brought into pressure contact with a cylindrical heating roller, which is supplied with electric power via a power supply member, with a predetermined pressure.
In a heat fixing device that fuses toner onto printing paper by inserting printing paper while rotating two rollers, the heating roller is provided with an insulating member that positions the power supply member, and the insulating member is the heating roller. Since the power feeding member is provided with a collar portion that comes into contact with the end surface of the power feeding member and a hooking portion that is hooked in a hole that penetrates the heating roller of the power feeding member in the axial direction, the power feeding member is insulated by friction with the external power feeding member. Even if an external force is relatively applied to the power feeding member, the movement of the power feeding member can be prevented, and the positional relationship between the power feeding member and the insulating member can be easily maintained by pre-assembling the power feeding member and the insulating member. When assembling the apparatus, it is possible to make the heat fixing apparatus easy to perform the positioning work.

According to the heat fixing device of the seventh aspect,
Press the rotatable pressure roller against the cylindrical heating roller,
A heating and fixing device that holds a printing sheet while rotating the heating roller and the pressure roller and fuses the toner to the printing sheet, wherein the heating roller has a release layer on the outer surface and has an inner surface on the inner surface. Is a hollow cylindrical substrate having a structure in which at least an electric insulating layer and a heat generating layer made of carbon fiber having electric resistance spirally arranged on the inner surface of the insulating layer are laminated, and a power feeding member is provided at both ends of the heat generating layer. In a heat fixing device in which a conductive member for supplying electric power from the outside comes into contact with the power supply member, a flanged shaft member that is inserted into a through hole formed in the power supply member and is attached to the conductive portion And the elastic member installed so as to be compressed by the flange portion of the shaft member and the conductive member, it is not necessary to press the brush electrode toward the power supply member by the external conductive member, and the movement of the power supply member is prevented. Prevent In addition, it does not require an insulating member to secure a creepage distance from the hollow cylindrical substrate, and provides a heating and fixing device that can use a general-purpose bolt, coil spring, etc., and easily and inexpensively configure a power supply unit. can do.

Further, according to the heating roller of the eighth aspect, the electric power is supplied through the power feeding member, and together with the rotatable pressure roller, the heating roller has a cylindrical shape that is pressed against the printing paper to fuse the toner to the printing paper. In the heating roller, the heating roller is provided with an insulating member that positions the power feeding member, and the insulating member includes a flange portion that comes into contact with an end surface of the heating roller, and rotates in a direction opposite to the rotation direction of the heating roller. Since it is screwed to the power supply member so that it can be tightened with
Even if an external force is applied to the insulating member relative to the power feeding member due to friction with the external power feeding member, movement of the power feeding member can be prevented, and friction with the external power feeding member causes the power feeding member to move relative to the insulating member. Since the reliable fastening is maintained even when the rotational force is applied, it is possible to provide the heating roller capable of preventing the movement of the power feeding member.

According to the heat fixing device of the ninth aspect,
A rotatable pressure roller is brought into pressure contact with a cylindrical heating roller, which is supplied with electric power via a power supply member, with a predetermined pressure.
In a heat fixing device that fuses toner onto the printing paper by inserting the printing paper while rotating the two rollers, the heating roller includes a release layer formed on the outer surface and an electric layer formed on the inner surface of the release layer. An insulating layer and a hollow cylindrical substrate having a structure in which a heating layer made of carbon fibers spirally arranged on the inner surface of the insulating layer is laminated, and an insulating member for positioning the power feeding member with respect to the heating layer, Since the insulating member includes a flange portion that comes into contact with the end surface of the heating roller, and a hook portion that is hooked in a hole that penetrates in the axial direction of the heating roller of the power feeding member, the insulating member is an external conductive member. Even if an external force is applied to the insulating member relative to the insulating member due to the friction of, the movement of the feeding member can be prevented, and the positional relationship between the feeding member and the insulating member can be prevented by pre-assembling them. To be held in the easy, during assembly of the heat-fixing device, it is possible to Tezuyo the heat fixing device positioning operation is simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a heating roller of a heating and fixing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of a heating roller of a heating and fixing device according to a second embodiment of the invention.

FIG. 3 is a cross-sectional view showing a main part of a heating roller of a heat fixing device according to a third embodiment of the invention.

FIG. 4 is a cross-sectional view showing a main part of a heating roller of a heat fixing device according to a fourth embodiment of the invention.

FIG. 5A is a sectional view showing a main part of a heating roller of a heating and fixing device according to a fifth embodiment of the present invention, and FIG. 5B is a perspective view of the same.

FIG. 6 is a sectional view showing a main part of a heating roller of a heat fixing device according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a main part of a heating roller of a heat fixing device according to a seventh embodiment of the present invention.

FIG. 8 is a partially cut front view showing the structure of a heating roller used in a conventional heating and fixing device.

FIG. 9 is a schematic side view of a conventional heat fixing device.

FIG. 10 is a cross-sectional view showing a main part of a heating roller of a heat fixing device of a first conventional example.

FIG. 11 is a sectional view showing a main part of a heating roller of a heat fixing device of a second conventional example.

FIG. 12 is a cross-sectional view showing a main part of a heating roller of a heat fixing device of a third conventional example.

FIG. 13 is a sectional view showing a main part of a heating roller of a heat fixing device of a fourth conventional example.

FIG. 14 is a sectional view showing a main part of a heating roller of a heat fixing device of a fifth conventional example.

FIG. 15 is a sectional view showing a main part of a heating roller of a heat fixing device of a sixth conventional example.

[Explanation of symbols]

12, 22, 32, 52, 62, 72 Power feeding members 11, 21, 31, 41, 51, 61, 71 Heating roller 174 Printing paper 14, 24, 44, 64 Insulating member 19 Release layer 172 Pressing roller 17 Electric Insulating layer 18 Heat generating layer 16 Hollow cylindrical substrate 14c, 44a Collar portion 64 Through hole 52a Bending portion 64a Hooking portion 13 Conductive member 73 Shaft member 74 Elastic member

Claims (9)

(57) [Claims] 1. A rotatable heating pressure roller is brought into pressure contact with a cylindrical heating roller to which electric power is supplied through a power supply member at a predetermined pressure, and a printing paper is passed through while rotating these two rollers to remove toner. In a heat fixing device that fuses to a printing sheet, the heating roller is provided with an insulating member that positions the power feeding member, and the insulating member includes a flange portion that abuts an end surface of the heating roller, and the heating roller. A heat fixing device, which is screwed to the power supply member so as to be tightened by a rotation in a direction opposite to the rotation direction of the heat fixing device. 2. A cylindrical heating roller, to which electric power is supplied via a power supply member, is brought into pressure contact with a rotatable pressure roller at a predetermined pressure, and while these two rollers are rotated, a printing paper is inserted to pass toner. In the heat fixing device that fuses to printing paper, the heating roller is provided with an insulating member that positions the power supply member, and the insulating member includes a flange portion that abuts on an end surface of the heating roller, and A heat fixing device comprising a through hole formed substantially at right angles to the axial direction, and the power feeding member being inserted into the through hole. 3. The heat fixing device according to claim 2, wherein both ends of the power feeding member are bent toward the end of the heating roller to form a bent portion, and the bent portion elastically contacts the heat generating layer. A heat fixing device characterized in that 4. The heat fixing device according to claim 2, wherein the insulating member is provided from the flange side of the through hole.
A heating and fixing device characterized in that a hole continuous in the roller axial direction is formed up to the end of the flange portion . 5. The heat fixing device according to claim 2, wherein the power feeding member has a curved surface formed on a contact surface with the heat generating layer. 6. A cylindrical heating roller, to which electric power is supplied via a power supply member, is brought into pressure contact with a rotatable pressure roller at a predetermined pressure, and while these two rollers are being rotated, a printing paper is inserted to remove toner. In the heat fixing device that fuses to a printing sheet, the heating roller is provided with an insulating member that positions the power feeding member, and the insulating member includes a flange portion that abuts an end surface of the heating roller, and the power feeding member. 2. A heat fixing device, comprising: a hooking portion hooked in a hole penetrating in the axial direction of the heating roller. 7. A heating and fixing device for pressing a rotatable pressure roller against a cylindrical heating roller, nipping a print sheet while rotating the heat roller and the pressure roller, and fusing toner to the print sheet. The heating roller has a release layer on the outer surface, and at least an electric insulating layer is laminated on the inner surface of the heating roller and a heat generating layer made of carbon fiber having electric resistance spirally arranged on the inner surface of the insulating layer. In the heat fixing device, which is composed of a hollow cylindrical substrate having the above-mentioned configuration, has a power feeding member at both ends of the heat generating layer, and a conductive member for supplying electric power to the power feeding member comes into contact with the heat fixing device. Is inserted through the through hole in the axial direction ,
And a shaft member with a flange attached to the conductive member,
A heat fixing device comprising: a flange portion of the shaft member and an elastic member installed so as to be compressed by the conductive member. 8. A cylindrical heating roller which is supplied with electric power through a power feeding member and is rotatable with a pressure roller and is pressed against printing paper to fuse toner to the printing paper, wherein the heating roller is the power feeding. An insulating member for positioning the member is provided, and the insulating member includes a flange portion that comes into contact with the end surface of the heating roller, and is screwed to the power feeding member so as to be tightened by rotation in a direction opposite to the rotation direction of the heating roller. The heating roller is characterized in that 9. A cylindrical heating roller, to which electric power is supplied through a power supply member, is brought into pressure contact with a rotatable pressure roller at a predetermined pressure, and while these two rollers are rotated, a printing paper is passed through the toner roller so as to remove toner. In a heat fixing device that fuses to a printing sheet, the heating roller is spirally arranged on a release layer formed on an outer surface, an electric insulating layer formed on an inner surface of the release layer, and an inner surface of the electric insulating layer. A hollow cylindrical substrate having a structure in which heat generating layers made of carbon fiber are laminated, and an insulating member for positioning the power feeding member with respect to the heat generating layer, the insulating member being a collar that abuts an end surface of the heating roller. A heating and fixing device, which is provided with a hooking portion that is hooked in a hole that penetrates the heating roller of the power feeding member in the axial direction.