JPH09281834A - Fixing roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fixing roller provided with a roller main body having a key groove in an axial direction capable of preventing a situation that the fixing roller can not be used because the key groove is deformed, cracked of damaged even in the case stress is centralized on the key groove at the time of transmitting motive power, and preventing cost from rising because of the above situation by forming the key groove as a bottomed groove not as an open key groove. SOLUTION: As for the fixing roller in which a core material 2 is constituted of thin metal and which is provided with the roller main body 1 having the key groove 3 in the axial direction for engaging/disengaging a driving transmitting member at the end; the key groove 3 is not formed as the open key groove but formed as the bottomed groove by the drawing of the main body. As the core material 2, resin ceramic or glass is used besides the metal, and the key groove 3 is integrally molded at the time of molding or the key groove 3 is formed by hot molding after the molding of a cylindrical body. Even when the stress is centralized on the key groove 3 in the case of turning the roller, the width of the key groove 3 does not get large, the key groove is not cracked or damaged, so that the situation that the roller can not be used is prevented.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a fixing roller of this type has been disclosed in
The one disclosed in 63-293575 is known, which is shown in FIG. 5, in which the core 22 is made of thin metal, and is attached to the driving member 24 at the end. And a roller body (21) having an axial key groove (23) for engaging and disengaging a transmission member (25) composed of a key. In such a fixing roller, when the fixing roller is operated, the driving member 24 is operated to transmit power to the roller main body 21 through the transmission member 25 and the key groove 23 engaged with the driving member 24, and the fixing force is transmitted. It will rotate.

[0003]

In such a fixing roller, since the roller main body 21 is made of a thin metal, the rise time is shortened and there is an advantage that it contributes to energy saving. However, in such a case, when the power is transmitted, the stress concentrates and deforms in the key groove 23 having a width W as shown in FIG. 6 provided in the roller body 21, and as shown in FIG. As described above, there is a problem that it spreads, cracks 26 occur, or it breaks and becomes unusable.
Further, in this type of fixing roller, a heat resistant elastic layer and a release layer are usually provided on the outer peripheral surface of the fixing roller, which is expensive. Therefore, if the fixing roller cannot be used as described above, there is a problem that the cost increases.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional fixing roller, and even if stress is concentrated on the key groove during power transmission, the key groove is deformed or cracked. SUMMARY OF THE INVENTION It is an object of the present invention to provide a fixing roller which does not become unusable due to damage or damage, and which does not increase costs.

[0005]

In order to achieve the above-mentioned object, the present invention relates to a fixing roller, wherein the invention described in claim 1 is such that the core material is made of a thin plate material, In a fixing roller having a roller body having an axial key groove for engaging and disengaging the drive transmission member, the key groove is not an open key groove but a bottomed groove. is there.

According to a second aspect of the present invention, there is provided a fixing roller comprising a core body made of a thin plate material and a roller body having an axial key groove for engaging and disengaging the drive transmission member at an end thereof. The key groove is an open key groove, and has a projecting edge formed inwardly at a side edge of the key groove.

According to a third aspect of the present invention, there is provided a fixing roller having a core body made of a thin plate material and a roller body having an axial key groove for engaging and disengaging the drive transmission member at an end thereof. The key groove is an open key groove, and an enlarged through hole is continuously provided at a tip portion of the key groove.

According to a fourth aspect of the present invention, there is provided a fixing roller comprising a core body made of a thin plate material and a roller body having an axial key groove for engaging and disengaging the drive transmission member at an end thereof. The key groove is an open key groove, has a projecting edge formed inward on the side edge of the key groove, and further has an enlarged through hole continuously provided at the tip of the key groove. It is a feature.

The fifth aspect of the invention is characterized in that a heat resistant elastic layer or a release layer is provided on the outer peripheral surface of the roller body.

[0010]

Embodiments of the present invention will be described with reference to the drawings. In each embodiment, the same parts are designated by the same reference numerals, and the description thereof will be omitted. The different parts will be mainly described.

The first embodiment shown in FIG. 1 is provided with a roller body 1 in which a core material 2 is made of a thin metal and has an axial key groove 3 for engaging and disengaging a drive transmission member at an end thereof. In the fixing roller, the key groove 3 is not an open key groove but is formed as a bottomed groove by drawing the main body. In this embodiment, the core material 2 is made of resin in addition to metal.
The keyway 3 may be integrally formed at the time of molding using ceramics, glass, or the like, or the keyway 3 may be formed by heat molding after molding the tubular body.

In the first embodiment, the key groove 3 is formed as a bottomed groove instead of an open key groove, although it is used in the fixing operation in the same manner as the conventional one. Therefore, when the driving member is actuated and the transmission member engages with the key groove 3 and rotates it, even if stress concentrates on the key groove 3, the strength is increased by the bottom portion thereof. Therefore, unlike the conventional one, the width of the key groove 3 is not widened, a crack is generated, or the key groove 3 is not damaged and becomes unusable.

The second embodiment shown in FIG. 2 is the first embodiment in that the key groove 3 is an open key groove, and a projecting edge 4 is formed inwardly at a side edge of the key groove 3. Unlike the form, it is similar in other respects. And this second
In the embodiment, since the groove edge portion of the key groove 3 is reinforced by the projecting edge 4, the width of the key groove 3 is widened, cracks are generated, or the key groove 3 is damaged and becomes unusable. There is no such thing.

In the third embodiment shown in FIG. 3, the keyway 3 is an open keyway as in the second embodiment. However, instead of providing the protrusion 4 or the like, the keyway 3 is formed. An enlarged through hole 5 is continuously provided at the tip. Further, in the third embodiment, since the enlarged through hole 5 is provided, the tensile stress applied to the tip end portion of the key groove 3 is dispersed, and the use thereof expands the width of the key groove 3 or cracks. It does not occur or become damaged and become unusable.

In the fourth embodiment shown in FIG. 4, the key groove 3 is an open key groove, and a projecting edge 4 formed inward is formed on the side edge of the key groove as in the second embodiment. Further, similarly to the third embodiment, the enlarged through hole 5 is continuously provided at the tip of the key groove 3. Further, in the fourth embodiment, the keyway 3 is reinforced by the projecting edge 4 and the enlarged through hole 5 is provided. Therefore, in using the keyway 3, the advantages of the second and third embodiments are combined and the keyway 3 is formed. There is no widening, cracking, or damage that renders it unusable.

The outer peripheral surface of each of these embodiments is
Usually, a thermoelastic layer and a release layer, which are not shown, are provided. Since such a roller body 1 is expensive, the roller body 1 is not deformed or damaged as described above to make it unusable, so that the cost does not increase.

[0017]

According to the present invention as described above, the core member is composed of a thin plate member, and the end is provided with the roller body having the axial key groove for engaging and disengaging the drive transmitting member. In the roller according to the first aspect of the invention, since the key groove is not an open key groove but a bottomed groove, even if stress is concentrated on the key groove during power transmission, the key groove may be deformed. Therefore, there is an effect that a crack is not generated or it is damaged and cannot be used, and thereby an increase in cost is not caused.

According to the second aspect of the present invention, the key groove is an open key groove, and the side edge of the key groove has a projecting edge formed inward. There is an effect that it will not spread, crack will be generated, or it will be damaged and become unusable.

According to the third aspect of the present invention, since the key groove is an open key groove and the enlarged through hole is continuously provided at the tip of the key groove, the tensile stress applied to the tip of the key groove is There is an effect that it is not dispersed and the use thereof does not widen the width of the keyway, generate a crack, or damage the keyway to make it unusable.

According to a fourth aspect of the present invention, the key groove is an open key groove, has a projecting edge formed inward on a side edge of the key groove, and further has a leading end portion of the key groove. Since the enlarged through holes are continuously provided, the effects of the inventions according to claims 2 and 3 are compounded in use, and the width of the key groove is widened, cracks are generated, or damage is caused, and the use is not possible. The effect is that nothing is possible.

According to the fifth aspect of the present invention, since the heat resistant elastic layer or the release layer is provided on the outer peripheral surface of the roller main body, the expensive roller main body is deformed or damaged so that it cannot be used. Since there is no such thing, there is an effect that the cost does not increase.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a perspective view of a second embodiment of the present invention.

FIG. 3 is a perspective view of a third embodiment of the present invention.

FIG. 4 is a perspective view of a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating the use of another conventional fixing roller of the same type as the present invention.

FIG. 6 is a plan view showing a normal state of the key groove of the above.

FIG. 7 is a plan view showing an abnormal state of the key groove of the above.

[Explanation of symbols]

 1 Roller body 2 Core material 3 Key groove 4 Projection edge 5 Expanded through hole

Claims (5)

[Claims] 1. A fixing roller having a core body made of a thin plate material and a roller body having an axial key groove for engaging and disengaging a drive transmission member at an end thereof, wherein the key groove is an open key groove. Instead, it is a fixing roller characterized by having a groove with a bottom. 2. A fixing roller having a core body made of a thin plate material and having a roller body having an axial key groove for engaging and disengaging a drive transmission member at an end thereof, wherein the key groove is an open key groove. The fixing roller is characterized in that it has a protruding edge formed inwardly on the side edge of the key groove. 3. A fixing roller having a core body made of a thin plate material and having a roller body having an axial key groove for engaging and disengaging a drive transmission member at an end thereof, wherein the key groove is an open key groove. The fixing roller is characterized in that an enlarged through hole is continuously provided at the tip of the key groove. 4. A fixing roller having a core body made of a thin plate material and having a roller body having an axial key groove for engaging and disengaging a drive transmission member at an end thereof, wherein the key groove is an open key groove. The fixing roller is characterized in that it has a projecting edge formed inwardly on the side edge of the key groove, and further has an enlarged through hole continuously provided at the tip of the key groove. 5. The fixing roller according to claim 1, wherein a heat resistant elastic layer or a release layer is provided on the outer peripheral surface of the roller body.