JPH10221994A - Induction heating roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating roller not causing a financial great loss by still keeping an inner layer in which a heat pipe is arranged, as it is, so that it is enough to exchange only an outer layer, without exchanging the whole after use with the lapse of time. SOLUTION: In the detection heating roller provided with a hollow roller 1 having a core metal and a supporting member 8 to which an induction coil 12 is attached and which rotatably supports the hollow roller 1, this hollow roller 1 is provided with the outer layer 4 having a releasing layer and the inner layer 7 in which the heat pipe 5 is arranged and which can be released from the outer layer 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating roller used as a fixing roller in a fixing device.

[0002]

2. Description of the Related Art As a typical type of induction heating roller of this type, there is a typical one as shown in FIG. 5, and 31 is a hollow roller, which is provided with a release layer 33 provided on the outer surface. An outer layer 34, and a support member 36 for the hollow roller 31. The support member 36 has a coil winding portion 37 provided at the center, and a support shaft 38 projecting from both side surfaces. An induction coil 39 is wound around the outer periphery of 37, and a support shaft 38 rotatably supports a hollow shaft portion 42 of the hollow roller 31 via a bearing 41.

In such a device, an induced magnetic flux is generated by an induction coil 39, and an induced current is generated in the conductive layer on the outer peripheral portion of the hollow roller 31 by the induced magnetic flux. The desired temperature is generated on the surface of 31.

[0004]

In this conventional example, the surface temperature of the hollow roller 31 is difficult to be uniform because of the above-mentioned structure, and a large temperature difference is generated between the portions. There is a problem that you can not get a good fixation,
As shown in FIG. 5, the heat roller 43 is provided on the hollow roller 31. By the way, when this kind of hollow roller 31 is used as a fixing roller, the release layer 23 on the surface thereof is deteriorated by the use with time, so that the whole must be replaced periodically. However, since the heat pipe 43 is expensive and the whole price is expensive, there is a problem that replacing the heat pipe 43 results in a great economic loss.

Accordingly, an object of the present invention is to solve the above-described problems of the conventional induction heating roller, and to replace the entire inner layer in which the heat pipes are housed without replacing the entire layer after use with time, without changing the outer layer. I just need to replace
An object of the present invention is to provide an induction heating roller that does not cause a great loss in economy.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a hollow roller and a support member to which an induction coil is attached and which rotatably supports the hollow roller. In the induction heating roller described above, the invention according to claim 1 is characterized in that the hollow roller includes an outer layer having a release layer, and an inner layer detachable from the outer layer in which the heat pipe is provided. Is what you do.

According to a second aspect of the present invention, in the first aspect, the outer layer is made of a metal having a smaller coefficient of thermal expansion than the inner layer.

[0008] The invention according to claim 3 is the invention according to claim 1 or 2.
The inner layer has a non-contact surface portion that does not contact the outer layer.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the heat pipes are disposed so as to face each other on the diameter of the inner layer and are provided in a plurality of sets of holes extending in the axial direction. It is characterized by being decorated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in FIGS. 1 to 4, reference numeral 1 denotes a hollow roller, and an outer layer 4 having a release layer 3 provided on an outer surface of a metal cylinder 2; Metal inner layer 7 in which heat pipe 5 detachable from 4 is installed
With Flanges 6 and 6 'are detachably fitted to the opening portions on both sides of the hollow roller 1, and a hollow shaft portion 9 protrudes outward from one flange 6'. Reference numeral 8 denotes a support member for the hollow roller 1. The support member 8 has a coil winding portion 10 provided at the center and support shaft portions 11, 11 'protruding from both side surfaces. An induction coil 12 is wound around the outer periphery of the shaft 10, and the supporting shafts 11, 11 'rotatably support the other flange 6 of the hollow roller 1 and the hollow shaft 9 via a bearing 13. I have.

The outer layer 4 is made of a metal having a smaller coefficient of thermal expansion than the inner layer 7, and the inner layer 7 has a structure as shown in FIG.
The heat pipe 5 has a non-contact surface portion 15 not in contact with the outer layer 4, and the heat pipe 5 is disposed facing a diameter of the inner layer 7, and is housed in a plurality of axially extending holes 16. One of the support shafts 11 is supported by a support plate 17, and this support plate 17 is detachably attached to one side plate 19 of the fixing device having an opening 18 through which the flange 6 passes. The other support shaft 11 'is supported on the other side plate 19'. Support plate 17 and flange 6
A spring 21 surrounding the support shaft portion 11 is interposed therebetween.
At the right. A gear 24 meshing with a drive gear 23 driven by a drive motor 22 is attached to the support shaft 11 '.

With this structure, the fixing operation is performed in the same manner as the conventional induction heating roller, and when the fixing operation needs to be replaced with time, the support plate 17 is moved from the side plate 19 as shown in FIG. After removing the spring 21 and then removing the flange 6, the inner and outer layers 7, 4 and removing the side plate 19,
The outer layer 4 is removed from the inner layer 7 and replaced with a new outer layer 4, and the removed members are assembled in the original order in the reverse order. When the inner layer 7 is removed from the outer layer 4 as described above, the inner and outer layers 7, 4
The presence of the non-contact surface portion 15 provided on the inner layer 7 between them prevents the both from coming into close contact with each other, thereby facilitating the removal of the inner layer 7.

In the induction heating roller assembled as described above, since the plurality of heat pipes 5 are arranged opposite to each other on the diameter of the inner layer 7, the thermal expansion in the diameter direction of the inner layer 7 becomes uniform. Since the outer layer 4 has a smaller coefficient of thermal expansion than the inner layer 7, the inner and outer layers are uniformly and tightly contacted with each other, so that the temperature of the surface of the release layer of the outer layer becomes uniform throughout, thereby obtaining a good fixing effect.

[0014]

According to the present invention, there is provided an induction heating roller having a hollow roller and a supporting member to which an induction coil is attached and rotatably supporting the hollow roller. The invention described in 1 is an induction heating roller including a support member rotatably supporting the hollow roller, wherein the hollow roller is separated from an outer layer having a release layer and an outer layer in which a heat pipe is provided. Because it has a possible inner layer, it is only necessary to replace the outer layer without changing the entire layer after the use over time, without replacing the entire inner layer where the heat pipe is installed, which can cause a great economic loss. There is no effect.

According to a second aspect of the present invention, in the first aspect of the present invention, the outer layer is made of a metal having a smaller coefficient of thermal expansion than the inner layer, so that the contact state between the inner and outer layers is improved, and the outer layer has a shaft. This has the effect of making the temperature distribution in the center direction uniform.

The third aspect of the present invention is the first or second aspect.
In the invention described in (1), since the inner layer has a non-contact surface portion that does not come into contact with the outer layer, there is an effect that when the inner layer is removed from the outer layer, the two layers do not adhere to each other and are hardly separated.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a plurality of sets of holes are provided in which the heat pipes are arranged to face each other on the diameter of the inner layer and extend in the axial direction. Because of the interior, the thermal expansion in the diametric direction during heating is uniform, the heat transfer of the inner and outer layers is facilitated, the temperature distribution in the diametric direction is uniform, and an excellent fixing result is obtained.

[Brief description of the drawings]

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

FIG. 2 is an exploded vertical sectional view of the same.

FIG. 3 is a partially cutaway bevel view of the inner and outer layers according to the first embodiment;

FIG. 4 is a vertical sectional front view of the same.

FIG. 5 is a longitudinal sectional view of a conventional induction heating roller of the same type as the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow roller 2 Cylindrical body 3 Release layer 4 Outer layer 5 Heat pipe 6, 6 'Flange 7 Inner layer 8 Support member 9 Hollow shaft part 10 Coil winding part 11, 11' Support shaft part 12 Induction coil 13 Bearing 14 Hollow shaft part 15 Non-contact surface 16 Hole 17 Support plate 18 Opening 19, 19 'Side plate 21 Spring 22 Drive motor 23 Drive gear 24 Gear

Claims (4)

[Claims] 1. An induction heating roller comprising: a hollow roller; and a support member to which an induction coil is attached and rotatably supporting the hollow roller, wherein the hollow roller has an outer layer having a release layer; An induction heating roller comprising an inner layer detachable from an outer layer in which a heat pipe is provided. 2. The induction heating roller according to claim 1, wherein the outer layer is made of a metal having a lower coefficient of thermal expansion than the inner layer. 3. The induction heating roller according to claim 1, wherein the inner layer has a non-contact surface portion not in contact with the outer layer. 4. The induction according to claim 1, wherein the heat pipes are arranged facing each other on the diameter of the inner layer and are housed in a plurality of sets of holes extending in the axial direction. Heating roller.