JPH10154576A - Induction heating roller - Google Patents

Abstract

(57) [Problem] To provide a low-cost induction heat generating roller which does not cause an electrical short and has a small weight as a whole. SOLUTION: This induction heating roller includes a hollow roller, and a coil unit having an induction coil mounted thereon and having a support member rotatably supporting the hollow roller, wherein the support member is made of resin. ing.

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 an image forming apparatus.

[0002]

2. Description of the Related Art A typical induction heating roller of this type is as shown in FIG. 6, in which 31 is a hollow roller, 32 is a support member for the hollow roller, and a guide member is provided on the outer periphery thereof. A support shaft 36 has a solid core portion 34 to which a coil 33 is attached, and protrudes from both side surfaces of the core portion 34.
Further, a hollow shaft portion 38 of the hollow roller 31 is rotatably supported via a bearing 37. One end of the support shaft 36 is an induction coil
A lead wire 39 connected to 33 is provided, and this lead wire 39 is led out of the support shaft 36 and connected to a power supply 40.

In such a device, an induced magnetic flux is generated by an induction coil 33, and an induced current is generated in a conductive layer on an outer peripheral portion of the hollow roller 31 by the induced magnetic flux. The desired temperature is generated on the surface of 31.

[0004]

However, in this conventional example, since the support member 32 is made of metal as described above, an electrical short-circuit occurs and the whole is large in weight and weight. There is a problem that it becomes expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional induction heating roller, to prevent an electric short circuit and to reduce the weight of the whole, thereby reducing the cost of the induction heating roller. Roller to provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a coil having a hollow roller, an induction coil, and a supporting member for rotatably supporting the hollow roller. In the induction heating roller including the unit, the invention according to claim 1 is characterized in that the support member is made of resin.

According to a second aspect of the present invention, in the first aspect, the support member has an induction coil support portion, and the induction coil support portion extends radially from a center portion. It has a support.

According to a third aspect of the present invention, in the first aspect, the support member has an induction coil support, and the induction coil support has a cylindrical shape. Is what you do.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the support member has a non-magnetic metal rod penetrating at the center thereof. is there.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the support member is made of a heat-resistant material based on PI, PEEK, PPS or a liquid crystal polymer. It is characterized by having.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment of the present invention shown in FIGS. 1 and 2, 1 is a hollow roller, 2 is a support member for a hollow roller 1, and this support member 2 serves as an induction coil support portion 3. The induction coil support portion 3 has hollow roller support shafts 4 and 5 having a smaller diameter than the induction coil support portion 3 at both ends. The hollow roller support shafts 4 and 5 Are rotatably supported. Reference numeral 10 denotes a pressure roller, 11 denotes a gear attached to one hollow shaft portion 8, and 15 denotes a release layer provided on the outer surface of the hollow roller 1.

The support member 2 is made of resin, and the induction coil support 3 has a plurality (eight in this embodiment) of induction coil supports 9 extending radially from the center. The induction coil 12 is supported on the outer periphery of the coil support 9 by interference fit or the like so as not to move in the axial direction of the induction coil support 3. A lead wire 14 is provided in a hollow hole 13 provided in the hollow roller supporting shafts 4 and 5 of the induction coil supporting member 3, and an inner end thereof is connected to the induction coil 12, and an outer end thereof is formed in the hollow roller supporting shafts 4 and 5. The outside is connected to the power supply. This allows the induction coil support 3 to supply power to the induction coil 12 and
Twelve supporters will do.

In this embodiment, since the support member 2 is made of a resin as described above, no electrical short-circuit occurs, and the whole is small in weight and low in cost. Since the induction coil support 3 of the support member 2 has the induction coil support 9 radially extending from the center, the induction coil support 3 has high rigidity and is lighter. Can be

FIG. 3 shows a support member 2 according to a second embodiment of the present invention.
The first point is that a nonmagnetic metal rod 16 penetrates the center.
Other members other than those different from the embodiment have no difference from those of the first embodiment.
Illustration and explanation will be omitted. The metal bar 16 is formed integrally when the support member 2 is formed. In the second embodiment, since the support member 2 has the above-described configuration, the support member 2 is prevented from being bent by heat due to the reinforcing action of the non-magnetic metal rod 16 and is made of a normal metal. The eddy current loss caused by using the rod is prevented.

FIG. 4 shows a third embodiment of the present invention. In the third embodiment, a small-diameter hollow roller 1 has a small diameter. Since each of the other members is different from that of the first embodiment except that it is different from the first embodiment in that the support member 2 is formed of a cylindrical tube,
Illustration and explanation of these members will be omitted. Since the support member 2 is formed of a cylindrical tube, the lead wire 14 is arranged in the hollow hole 17 of the support member 2, the inner end thereof is connected to the induction coil 12, and the outer end is formed of the support member. 2, the structure of the conductive part to the induction coil 12 is simplified, and the assembling is facilitated. The induction coil support part 3 supplies power to the induction coil 12, supports the induction coil 12, Are performed at the same time, so that the cost is low.

FIG. 5 shows a fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that a non-magnetic metal tube 18 penetrates the support member 2 at its center. The other members that are different from those of the third embodiment are the same as those of the third embodiment, and therefore, illustration and description of these members are omitted. The metal tube 18 is formed integrally when the support member 2 is formed. In the fourth embodiment, since the support member 2 has the above-described configuration, the support member 2 is prevented from bending due to heat due to the reinforcing action of the non-magnetic metal tube 18, and the ordinary metal tube is used. To prevent the eddy current loss caused by using.

The support member 2 in each of the above embodiments is made of a heat-resistant material based on PI, PEEK, PPS or a liquid crystal polymer, and is prevented from being deformed by the heat resistance.

[0018]

The present invention is as described above, and comprises a hollow roller and a coil unit to which an induction coil is attached and which has a support member rotatably supporting the hollow roller. According to the first aspect of the invention, since the support member is made of a resin, there is no electric short circuit, and the whole is small in weight and has an effect of low cost.

According to a second aspect of the present invention, the support member has an induction coil support, and the induction coil support has an induction coil support extending radially from the center. Has an effect that a large rigidity is secured and the weight is further reduced.

According to the third aspect of the present invention, since the support member has an induction coil support, and the induction coil support has a cylindrical shape, the induction coil can be pulled out from the center. Therefore, there is an effect that assembly is easy.

According to the fourth aspect of the present invention, since the support member has a non-magnetic metal rod penetrating at the center, the support member is prevented from being bent by heat, and an ordinary metal rod is used. This has the effect of preventing eddy current loss caused by this.

According to the fifth aspect of the present invention, since the supporting member is made of a heat-resistant material based on PI, PEEK, PPS or liquid crystal polymer, there is an effect that the heat resistance is high.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a longitudinal sectional view of a support member according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a support member according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a support member according to a fourth embodiment of the present invention.

FIG. 6 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 Support member 3 Induction coil support part 4 Hollow roller support shaft 5 Hollow roller support shaft 6 Bearing 7 Hollow shaft part 8 Hollow shaft part 9 Induction coil support 10 Pressure roller 11 Gear 12 Induction coil 13 Hollow hole 14 Lead Wire 15 Release layer 16 Metal rod 17 Hollow hole 18 Metal tube

Claims (5)

[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 support member is made of resin. Characterized induction heating roller. 2. The induction heating device according to claim 1, wherein the support member has an induction coil support, and the induction coil support has an induction coil support extending radially from a central portion. roller. 3. The support member has an induction coil support portion,
The induction heating roller according to claim 1, wherein the induction coil support has a cylindrical shape. 4. The induction heating roller according to claim 1, wherein the support member has a non-magnetic metal rod penetrating at the center thereof. 5. The support member is made of heat-resistant PI, PEEK,
5. The induction heating roller according to claim 1, wherein the induction heating roller is made of a material based on PPS or liquid crystal polymer.