JPH1097151A - Fixing roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of rust on the outer peripheral surface of a fixing roller and to protect the fixing roller from being made unrotatable because of having a bearing shaved by the rust and increasing fixing driving torque by chips by applying sand blasting processing over the entire area of the outer peripheral surface including the paper passing part of core material and the bearing part or the like and successively constituting a primer layer and a fluorinated carbon resin layer on a surface. SOLUTION: The surface having fine unevenness is formed by applying the sand blasting processing over the entire area of the outer peripheral surface including the paper passing part W of the core material 2 and the bearing part 6 or the like. The primer layer 9 and the fluorinated carbon resin layer 11 are successively constituted on an uneven surface. In this case, the surface roughness of the uneven surface is made as Rz8-20μm. Since the releasing property of the layer 11 is usually excellent, the layer 11 is easily stripped in the case of being directly provided on the outer peripheral surface of the core material 2, so that the primer layer 9 is provided on the outer peripheral surface of the core material 2 and the layer 11 is provided on the outer peripheral surface. Thus, stripping is suppressed.

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 device having a fixing roller according to the present invention is constructed as shown in FIGS. 6 and 7. In this fixing device, 1 is a fixing roller, and 2 is a carbon steel pipe. Reference numeral 3 denotes an elastic roller, reference numeral 4 denotes a heater disposed in the core member 2, reference numeral 5 denotes a drive gear attached to the core member 2, and reference numeral 6 denotes a bearing.

[0003] In such a fixing roller 1, since the core material 2 is made of a carbon steel pipe, there is a problem that rust is generated. To prevent this, it is necessary to perform Parker treatment on the carbon steel pipe. However, the effect of preventing rust generation is maintained only for a short period of time, and rust cannot be prevented from occurring during transportation or storage at the time of parts or after completion of goods.

[0004]

When a fixing roller having rust generated in such a manner is used, the appearance is deteriorated and the commercial value is reduced, and the rust causes the bearing 6 to be cut off.
There is a problem that the shaving powder increases the fixing driving torque and the fixing roller cannot rotate. Therefore, in order to solve such a problem, a fluororesin layer 7 is provided on the outer peripheral surface of the core material 2, and the fluororesin layer 7 is provided up to a portion supported by the bearing 6. Since the outer peripheral portion located outside that is exposed to the outside air, rust cannot be prevented from being generated in this portion, and this rust goes around the bearing 6 to cause the bearing 6 or the fluororesin layer 7. There is a problem that such a thing occurs as to cut off.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional fixing roller, and to prevent rust on the outer peripheral surface of the fixing roller in a fixing roller having a core made of carbon steel pipe. The bearing does not degrade the product value due to lack of appearance, and the bearing is shaved by rust, and the shaving powder increases the fixing driving torque and makes the fixing roller unable to rotate. The purpose of the present invention is to provide a fixing roller having no problem.

[0006]

According to the present invention, in order to achieve the above object, in a fixing roller, the invention according to claim 1 is characterized in that a core material is constituted by a carbon steel pipe, Is subjected to sandblasting over the entire outer peripheral surface including the paper passing portion, the bearing portion, and the like, and a primer layer and a fluororesin layer are sequentially formed on the surface thereof.

According to a second aspect of the present invention, the core is made of carbon steel pipe, and the entire outer peripheral surface of the core including the paper passing portion, the bearing portion, and the like is subjected to sandblasting, and the surface thereof is formed. Ni or Ni-Cr plating layer or A
1 or Ag deposition layer, and Ni or Ni
A primer layer and a fluororesin layer are sequentially formed on at least a portion corresponding to a paper passing portion of the outer peripheral surface of the Cr plating layer or the Al or Ag vapor deposition layer, and the Ni or Ni-Cr layer is formed.
Minimum thickness of plating layer or Al or Ag deposition layer is 5μ
a fixing roller having a diameter of at least m.

[0008]

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

In the first embodiment shown in FIGS. 1 to 3, the entire outer peripheral surface including the paper passing portion W, the bearing 6 and the like of the core material 2 is subjected to sandblasting to form a fine uneven surface 8 (FIG. 3). ), Immediately after that, a primer layer 9 and a fluororesin layer 11 are sequentially formed on the uneven surface 8. In this case, the surface roughness of the uneven surface 8 is set to Rz 8 to 20 μm.

Usually, since the fluororesin layer 11 has good releasability, if it is provided directly on the outer peripheral surface of the core material 2 as it is, it has a disadvantage that it is easily peeled off. Since the primer layer 9 is provided on the outer peripheral surface of the core material 2 and the fluororesin layer 11 is provided on the outer peripheral surface, such a phenomenon is suppressed. However, this primer layer 9 is formed by sandblasting. Since the core material 2 is provided on the uneven surface 8 having a large adhesive area,
Peeling is more effectively prevented.

The type of fluororesin used for this type of fixing roller is generally selected from the group consisting of ethylene tetrafluoride resin, perfluoroalkoxy resin, perfluoroethylene propylene resin, and a mixed resin thereof from the viewpoint of preventing rust. Although valid, in this embodiment,
The toner used was a positively charged toner. From the viewpoint of matching with the toner, a material based on perfluoroethylene propylene resin and imparted with conductivity was used. And the primer layer 9 and the fluororesin layer 11
Is a minimum film thickness of 7 μm or more, preferably 10 μm or more.

The second embodiment shown in FIGS. 4 and 5 is different from the first embodiment in that a Ni or Ni—Cr plating layer 12 is provided between a core material 2 and a primer layer 9. And the primer layer 9 and the fluororesin layer 11 are not necessarily provided over the entire outer peripheral surface of the core material 2.
It suffices if it is provided at least in a portion corresponding to the paper passing portion W, and the other points are the same. The minimum thickness of the Ni or Ni—Cr plating layer 12 is 5 μm or more, and the average thickness is 7 μm or more. The reason why the film thickness is set to such a dimension is that if the thickness is 5 μm or less, rust may occur.

Although the illustration of the third embodiment is omitted, the difference from the second embodiment is that Ni or Ni-Cr is used.
The second embodiment is the same as the second embodiment, including the thickness of the film, except that the plating layer 12 is replaced with an Al or Ag vapor deposition layer. However, Al is Ni or Ni-C
Since the thermal conductivity is better than that of r, the fixability is good and the cost is low, and Ag having better thermal conductivity may be used.

[0014]

The present invention is as described above. In the fixing roller according to the first aspect of the present invention, the core material is formed of a carbon steel pipe, and a paper passing portion, a bearing portion, and the like of the core material are formed. Sandblasting is performed over the entire outer peripheral surface including the primer layer and the fluororesin layer on the surface in order, so that rust may be generated on the outer peripheral surface of the fixing roller whose core material is made of carbon steel pipe. The bearings are not shaved by rust and the fusing drive torque is not increased by the shavings to prevent the fixing roller from rotating. In addition, there is an effect that the primer layer and the fluororesin layer are not separated from the outer peripheral surface of the core material.

According to a second aspect of the present invention, the core material is formed of a carbon steel pipe, and the entire outer peripheral surface of the core material including the transfer paper passing portion, the bearing portion, and the like is subjected to sandblasting, and the surface thereof is formed. Forming a Ni or Ni-Cr plating layer,
Since a primer layer and a fluororesin layer are sequentially formed on at least a portion corresponding to a paper passing portion on the outer peripheral surface of the Ni or Ni-Cr plating layer, and the minimum thickness of the Ni or Ni-Cr plating layer is 5 μm or more, By the Ni or Ni-Cr plating layer, rust does not occur on the outer peripheral surface of the fixing roller whose core material is made of carbon steel pipe, and the appearance does not deteriorate and the commercial value is not reduced. In addition to the fact that the bearing is shaved by rust and the shaving powder increases the fixing driving torque to prevent the fixing roller from rotating, the Ni or Ni-Cr plating layer is formed from the outer peripheral surface of the core material. In addition, there is an effect that the primer layer and the fluororesin layer are not separated from the Ni or Ni-Cr plating layer.

According to a third aspect of the present invention, the core material is formed of a carbon steel pipe, and the entire outer peripheral surface of the core material including the transfer paper passing portion, the bearing portion, and the like is subjected to sand blasting, and the surface thereof is made of Al. Alternatively, an Ag deposition layer is formed, and this Al or A
g The primer layer and the fluororesin layer are sequentially formed on at least the portion corresponding to the paper passing portion on the outer peripheral surface of the g vapor-deposited layer, and the minimum thickness of the Al or Ag vapor-deposited layer is 5 μm or more. Rust does not occur on the outer peripheral surface of the fixing roller made of carbon steel pipe, the appearance does not deteriorate and the commercial value does not decrease, and the bearing is cut off by rust. In addition to the fact that the shaving powder does not increase the fixing driving torque to prevent the fixing roller from rotating, the Al or Ag has good thermal conductivity and thus has good fixing properties. From the outer peripheral surface of the material, the primer layer and the fluororesin layer
There is an effect that it does not peel off from the l or Ag deposition layer.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a partially cutaway front view similar to FIG. 1 of a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 shows another conventional fixing roller of the same type as the present invention.
It is a partially notched front view similar to.

FIG. 7 is a sectional view taken along line 7-7 in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing roller 2 Core material 3 Elastic roller 4 Heater 5 Drive gear 6 Bearing 7 Fluororesin layer 8 Irregular surface 9 Primer layer 11 Fluororesin layer 12 Ni or Ni-Cr plating layer

Claims (3)

[Claims] 1. A core material is formed of a carbon steel pipe, and a sandblasting process is performed on the entire outer peripheral surface including a paper passing portion, a bearing portion, and the like of the core material, and a primer layer and a fluororesin layer are sequentially formed on the surface thereof. A fixing roller, characterized in that: 2. A core material is made of a carbon steel pipe, and the entire outer peripheral surface of the core material including a paper passing portion, a bearing portion and the like is subjected to sandblasting to form a Ni or Ni—Cr plating layer on the surface thereof. A primer layer and a fluororesin layer are sequentially formed on at least a portion of the outer peripheral surface of the Ni or Ni-Cr plating layer corresponding to the paper passing portion, and the Ni or Ni-C
A fixing roller, wherein the minimum thickness of the r-plated layer is 5 μm or more. 3. A core material is made of carbon steel pipe, and the entire outer peripheral surface including a paper passing portion, a bearing portion, and the like of the core material is subjected to sandblasting to form an Al or Ag vapor deposition on the surface thereof. Alternatively, a primer layer and a fluororesin layer are sequentially formed on at least a portion corresponding to a paper passing portion on the outer peripheral surface of the Ag vapor deposition layer, and the minimum thickness of the Al or Ag vapor deposition layer is 5 μm.
a fixing roller having a diameter of at least m.