JPH0980953A - Fixing device for image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device for an image forming device capable of reducing heat loss and saving power consumption. SOLUTION: A heating carrying roller 21 and a pressuring heating roller 26 are constituted by respectively forming surface mold-released layers 23 and 29 on the surfaces of core bars 22 consisting of a hollow cylinder made of aluminum. The layers 23 and 29 are constituted of composite material obtained by mixing fluororesin such as PTFE, PFA or the like with metal showing excellent heat conductivity such as nickel. The layer 29 of a pressuring carrying rotating body is constituted of material having spectral emissivity in a wavelength region where wavelength is 5 to 10μm smaller than that in this wavelength region of the layer 23 of a heating carrying rotating body. By such constitution, the surface temperature of the carrying rotating body is controlled to be lower than that of the conventional fixing roller while keeping the required fixing strength of toner, the heat loss is reduced and the power consumption is saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic image forming apparatus, and more particularly to a fixing device for an image forming apparatus which heats and fixes a toner image formed on a recording medium.

[0002]

2. Description of the Related Art In an electrophotographic image forming apparatus, an electrostatic latent image formed on a photosensitive drum is developed by a toner, the toner image is transferred to a recording medium, and the recording medium is transferred to a predetermined area. By passing the toner through a fixing roller heated to a constant temperature, the toner is melted by heating and pressed onto the recording medium to fix the toner image.

The fixing roller is temperature-controlled so as to maintain a predetermined fixing temperature, for example, 200 ° C. during operation of the apparatus, but when the apparatus is in a standby state, wasteful consumption of heating power is suppressed. Therefore, the fixing temperature during operation, for example, 20
The temperature is controlled to a predetermined temperature lower than 0 ° C, for example, 160 ° C. Further, when the print key is not operated for a predetermined time or more in the standby state, the power saving mode is entered and the temperature is controlled to a temperature lower than the temperature in the standby state, for example, 120 ° C. is there.

In addition, in order to reduce the heat loss radiated from the fixing roller, measures such as covering the periphery of the fixing roller with a heat insulating material are taken, and the fixing device consumes energy consumed by the fixing device. Various means are incorporated to minimize it.

[0005]

However, when the image forming apparatus enters the operating state from the power saving mode or enters the operating state from the standby state, the temperature of the fixing roller is set to a predetermined temperature capable of fixing. Must be raised to. Since a certain waiting time is required for the rise of this temperature, it cannot be adequately adapted to the needs for quick processing.

Further, in order to reduce the heat loss radiated from the fixing roller, when a structure covered with a heat insulating material is adopted,
For that reason, a space is required, which causes a problem that the device becomes large. The present invention is intended to solve the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and in the invention of claim 1, a heating conveyance rotary member for heating and fixing a toner image formed on a recording medium and a pressure conveyance rotation. In a fixing device of an image forming apparatus including a fixing unit including a body, the heating and conveying rotary body and the pressure and conveying rotary body each have a release layer on the surface, and the surface releasing layer of the pressurizing and conveying rotary body. Is composed of a material having a spectral emissivity in the wavelength range of 5 to 10 μm, which is smaller than the spectral emissivity of the surface release layer of the heating and conveying rotary member in the wavelength range.

The surface release layer of the pressure-conveying rotary member has a spectral emissivity of 0.65 or less in the wavelength range of 5 to 10 μm.

Further, among the surface release layers of the heating and transporting rotary member and the pressure transporting rotary member, at least the surface release layer of the pressurizing and transporting rotary member has a release material and a radiation wavelength of 5 to 10 μm.
It is preferable to use a composite material with a material having a spectral emissivity in the wavelength range of m that is smaller than the release material.

According to a fourth aspect of the present invention, there is provided a fixing device for an image forming apparatus, which comprises a fixing means composed of a heating / conveying rotary member for heating and fixing a toner image formed on a recording medium and a pressing / conveying rotary member. The heating and transporting rotary body and the pressurized and transporting rotary body each have a surface release layer composed of a composite material of a release material and a low-radioactive material, and the surface of the heating and transporting rotary body and the pressure transporting rotary body. The low-emissivity material of the composite material forming the release layer is characterized by having a spectral emissivity of 0.65 or less in the wavelength range of 5 to 10 μm of radiation.

The releasing material of the composite material forming the surface releasing layer of the heating and conveying rotary member and the pressing and conveying rotary member is one or a plurality of fluororesins or silicone rubber, and has a low heat radiation property. The material may be one or more metals or metal alloys.

According to an eighth aspect of the invention, in the fixing device of the image forming apparatus, the fixing device is provided with the fixing means including the heating and conveying rotary member for heating and fixing the toner image formed on the recording medium and the pressing and conveying rotary member. The heating and transporting rotary body and the pressing and transporting rotary body each have a surface release layer composed of a composite material of a releasing material and a low-radioactive material, and are included in the surface release layer of the pressing and transporting rotary body. The surface exposure rate of the low emissivity material is higher than the surface exposure rate of the low emissivity material contained in the surface release layer of the heating and conveying rotary member.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The spectral emissivity of the surface release layer of the pressure transfer rotator is made smaller than the spectral emissivity of the surface release layer of the heating transfer rotator. For this purpose, the surface release layer of the pressure transfer rotary member and the heating transfer rotor is formed of a composite material of a release material and a low radiation material, and these materials are appropriately selected.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

[Structure of Copying Apparatus] FIG. 1 is a sectional view showing an example of the structure of a copying apparatus to which the fixing device of the present invention is applied. Since its structure is the same as that of a known electrophotographic copying machine, its outline will be briefly described here.

In the copying apparatus, a photosensitive drum 10 which rotates at a constant peripheral speed is arranged in the central portion, an original table 1 is arranged above the photosensitive drum 10, and a scanning optical system 3 is arranged below it. A paper feed unit 5 is arranged on the lower left side of the photosensitive drum 10.

Around the photoconductor drum 10, a charging carrier 11, a developing device 13, a transfer carrier 15, and a separation carrier are provided.
A jar 16, a cleaner 18, a fixing device 20, etc. are arranged.

The scanning optical system 3 includes an illumination light source 2 and a movable mirror.
31-33, conjugate length correction mirrors 34, 35, fixed mirror
36, and a projection lens 37 whose magnification can be changed.

The illuminating light source 2 and the movable mirror 31 are integrally held, and the movable mirrors 32 and 33 are integrally held, respectively, so that they can be moved and scanned right below the document table 1 to the left in FIG. Has been done. In the case of equal-magnification copying, the illumination light source 2 and the movable mirror 31 move at the same speed as the peripheral speed v of the photosensitive drum 10, and the movable mirrors 32 and 33 move at a speed of v / 2 m.

The paper feed section 5 includes a paper feed cassette 51 and a paper feed roll.
And a timing roller 53. The recording paper CP stored in the paper feed cassette 51 is fed by a paper feed roller 52 which is rotationally driven, and is conveyed by a convey roller (not shown) so that the leading end thereof is in the nip portion of the timing roller 53. It temporarily stops at the contacting standby position R.

The original M placed on the original table 1 is scanned by the scanning optical system 3 and an electrostatic latent image of the original image is formed on the photosensitive drum 10. The electrostatic latent image of the original image formed on the photosensitive drum 10 is developed by the toner in the developing device 13 and moved to the transfer position, but the timing roller 53 starts rotating at this timing, The recording paper CP that has been waiting at the waiting position R is conveyed to the transfer position where the transfer carrier 15 is located. At the transfer position, transfer charger 15
The toner image formed on the photoconductor drum 10 is transferred to the recording paper CP by the action of. The recording paper CP is separated from the photoconductor drum 10 by the action of the separation charger 16 and is conveyed by the conveyor belt 19 and is heated and pressed by the fixing device 20, and the toner image is fixed on the recording paper CP.

[Structure of Fixing Device] FIG. 2 is a sectional view for explaining the structure of the fixing device 20, and FIG. 3 shows the heating and conveying roller 21 and the pressure conveying roller 26, which are the main constituent members of the fixing device 20. FIG. The heating / conveying roller 21 and the pressing / conveying roller 26 have a plurality of embodiments as will be described later. 2 and 3 show the first embodiment.

Heating transport roller 21 and pressure transport roller 26
Are configured to rotate in the arrow direction by a drive mechanism (not shown) while being pressed against each other. A separation claw 41 is arranged in contact with the roller 21 on the downstream side in the rotation direction of the heating and conveying roller 21, and a separation claw 42 is arranged on the downstream side in the rotation direction of the pressure conveying roller 26. Placed in contact with 26,
The recording paper CP is heated and conveyed by the roller 21 and the pressure roller 2.
It is configured to be peeled from 6 and discharged.

Further, a temperature detecting sensor 25 for detecting the surface temperature is arranged in contact with the surfaces of the heating / conveying roller 21 and the pressing / conveying roller 26, and the heating / conveying roller 21 and the pressing / conveying roller 21 are in contact with each other. The surface temperature of 26 is constantly detected, and the energizing time of the heating halogen heater 24 is controlled by a temperature control circuit (not shown) so as to be maintained at a predetermined constant temperature set in advance.

The reference numeral 43 designates a heating conveyance roller 21 and a pressure conveyance roller 21 for the recording paper CP on which the unfixed toner image Tn is formed.
Guide plates for guiding the nip portion of the roller 26, and 44, 45 are guide plates for guiding the fixed recording paper CP in the discharging direction.

Reference numeral 46 denotes a cleaning device and an offset preventing liquid coating device for removing toner adhering to the surface of the heating and conveying roller 21. Further, 47 and 48 are heating and conveying rolls.
It is a heat insulating and heat reflecting material which surrounds the roller 21 and the pressure transfer roller 26 and prevents heat radiation from the heating transfer roller 21 and the pressure transfer roller 26.

There are a plurality of embodiments having different configurations for the combination of the heating / conveying roller and the pressing / conveying roller in the above-mentioned fixing device, and a heating / conveying belt may be used instead of the heating / conveying roller. . Therefore, in this specification, the heating / conveying roller, the heating / conveying belt, and the heating / conveying roller may be referred to as the pressing / conveying roller. Hereinafter, a plurality of examples of combinations of the heating and transporting rotary body and the pressurizing and transporting rotary body will be described.

[First Embodiment of Combination of Heated Conveying Rotating Body and Pressurizing Conveying Rotating Body] The first embodiment is a combination of a heating conveying roller and a pressure conveying roller, which will be described below.

The heating / conveying roller 21 has the structure shown in FIG. 3, in which a hollow cylindrical core metal 22 is made of a metal material such as aluminum, copper, iron or the like having a good heat conduction characteristic.
Polytetrafluoroethylene (hereinafter referred to as PTF) on the surface of 2
E), polyphenylenealkoxy ether (hereinafter referred to as PFA), and the like.

The physical properties of the surface release layer of the heating / conveying roller are such that the wavelength range of radiation is 5 to 10 μm (infrared range).
Has a spectral emissivity of 0.9 or more and a thermal conductivity of 6.0.
× 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal / (deg · cm · s), and the surface roughness Rz of the surface release layer (10-point average roughness, unit μm, hereinafter simply referred to as Rz). Described) is 40 μm or less.

The pressure-conveying roller is the pressure-conveying roller 26 having the structure shown in FIG. 3, in which the hollow cylindrical core metal 27 is made of a metal material such as aluminum, copper, iron or the like having good heat conduction characteristics. The elastic layer 28 made of a heat-resistant material such as silicon rubber is formed on the elastic layer 28, and PTFE is formed on the elastic layer 28.
A surface release layer 29 made of a fluororesin such as PFA is formed.

The surface release layer 29 of the pressure transfer roller is PT.
70% by volume of nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as FE and PFA.
Composed of mixed composite material, radiation wavelength 5-10
The spectral emissivity in the wavelength range of μm is smaller than the spectral emissivity in the wavelength range of 5 to 10 μm of the radiation of the surface release layer of the heating and conveying roller.

As for the physical property of the surface release layer of the pressure transfer roller, the spectral emissivity in the wavelength range of 5 to 10 μm of the radiation is 0.15.

A conventional heating / conveying roller and a pressing / conveying roller shown in order to compare the performance of the combination of the heating / conveying roller and the pressing / conveying roller of the first embodiment will be described later.

The conventional heating / conveying roller is the same as the heating / conveying roller of the first embodiment, and the physical property of the surface release layer is that the spectral emissivity is 0 in the wavelength range of 5 to 10 μm. 0.9 or more, and the conventional pressure-conveying roller is almost the same as the pressure-conveying roller of the first embodiment, but the physical properties of the surface release layer are different, and the wavelength of the radiation is 5 The spectral emissivity in the wavelength range of 10 μm is 0.9 or more.

[Second Embodiment of Combination of Heating and Conveying Rotating Body and Pressurizing and Conveying Rotating Body] The second embodiment is the heating and conveying roller described below and the pressure and conveying roller of the first embodiment. It is a combination with.

The heating and conveying roller 61 of the second embodiment is shown in FIG.
As shown in the sectional structure in FIG. 1, an elastic layer 63 made of a heat-resistant material such as silicon rubber is formed on a hollow cylindrical cored bar 62 made of a material such as aluminum, copper or iron having good heat conduction characteristics. , PF over the elastic layer 63
A surface release layer 64 made of a fluororesin such as A is formed.

The physical property of the surface release layer 64 is that the spectral emissivity is 0.9 in the wavelength range of 5 to 10 μm.
As described above, the thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal.
It is about / (deg ・ cm ・ s). Surface Roughness of Surface Release Layer R
z is 40 μm or less.

The pressure conveying roller 65 has a sectional structure as shown in FIG. 4, and has the same constitution as the pressure conveying roller 26 of the first embodiment. That is, the core 66 of the hollow cylinder is made of a metal material such as aluminum, copper, and iron having good heat conduction characteristics, and an elastic layer 67 made of a heat-resistant material such as silicon rubber is formed on the core metal 66. PTFE, PFA on top
A surface release layer 68 made of a fluororesin such as the above is formed.

The surface release layer 68 of the pressure transfer roller 65 is
Nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as PTFE and PFA, in a volume ratio of 7
Composed of 0% mixed composite material
The spectral emissivity in the wavelength range of 10 μm is 0.15.

A conventional heating / conveying roller and a pressing / conveying roller will be described below for the purpose of comparing the performance of the combination of the heating / conveying roller and the pressing / conveying roller of the second embodiment.

The conventional heating / conveying roller is the same as the conventional heating / conveying roller shown in the second embodiment, and the physical property of the surface release layer is that the wavelength range of the radiation is 5 to 10 μm. Has a spectral emissivity of 0.9 or more. The conventional pressure-conveying roller is the same as the conventional pressure-conveying roller shown in the first embodiment, and the physical property of the surface release layer is that the wavelength of radiation is 5 to 10 μm. The spectral emissivity in the region is 0.9 or more.

[Third Embodiment of Combination of Heating and Conveying Rotating Body and Pressurizing and Conveying Rotating Body] The third embodiment is the heating and conveying roller of the second embodiment and a pressing and conveying roller described below. It is a combination with.

The heating / conveying roller 71 of the third embodiment has the same structure as the heating / conveying roller of the second embodiment, and as shown in the sectional structure of FIG. An elastic layer 73 made of a heat-resistant material such as silicon rubber is formed on a hollow cylindrical core metal 72 made of a material such as copper or iron, and a fluororesin such as PTFE or PFA is formed on the elastic layer 73. The surface release layer 74 is formed.

The physical property of the surface release layer 74 is that the spectral emissivity is 0.9 in the wavelength range of 5 to 10 μm.
As described above, the thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal.
It is about / (deg ・ cm ・ s). Surface Roughness of Surface Release Layer R
z is 40 μm or less.

The pressure-conveying roller 75 is obtained by omitting the elastic layer 28 in the pressure-conveying roller 26 of the first embodiment. As shown in the sectional structure of FIG. The surface release layer 77 is formed on a core metal 76 of a hollow cylinder which is made of a material such as aluminum, copper or iron.

The surface release layer 77 of the pressure transfer roller 75 is
Nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as PTFE and PFA, in a volume ratio of 7
Composed of 0% mixed composite material
The spectral emissivity in the wavelength range of 10 μm is 0.15.

A conventional heating and conveying roller and a heating and elastic conveying roller, which will be shown later for the purpose of comparing the performance of the combination of the heating and conveying roller and the pressing and elastic conveying roller, will be described. To do.

The conventional heating / conveying roller is the same as the conventional heating / conveying roller shown in the second embodiment, and the physical properties of the surface release layer are in the radiation wavelength range of 5 to 10 μm. The spectral emissivity is 0.9 or more.

Further, the conventional pressure elastic transport roller is the same as the conventional pressure elastic transport roller shown in the first embodiment, and the physical property of the surface release layer is the wavelength of the radiation. 5-
The spectral emissivity in the wavelength range of 10 μm is 0.9 or more.

[Fourth Embodiment of Combination of Heating and Conveying Rotating Body and Pressurizing and Conveying Rotating Body] In the fourth embodiment, a heating and conveying belt is used instead of the heating and conveying roller of the first embodiment. This is combined with the pressure transfer roller of the first embodiment.

The heating / conveying belt will be described. The heating / conveying belt of the fourth embodiment is a heating / conveying belt in which an unfixed recording sheet is sandwiched between the heating / conveying belt and the pressure elastic conveying roller, and heating / fixing processing can be performed while conveying the recording sheet. is there.

As shown in the sectional structure of FIG. 6, the heating and conveying belt 81 has a surface release layer 83 made of a fluororesin such as PTFE or PFA on a thin metal film 82 such as nickel alloy having a thickness of about 40 μm. It was done. The base of the belt may be made of a heat resistant synthetic resin film such as polyimide or polyester, instead of the metal film described above.

The surface release layer 83 has a physical property that the spectral emissivity is 0.9 in the wavelength range of 5 to 10 μm.
As described above, the thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal.
It is about / (deg ・ cm ・ s). Surface Roughness of Surface Release Layer R
z is 40 μm or less.

The pressure-conveying roller 85 is the same as the heating-conveying roller of the first embodiment. As shown in the sectional structure of FIG. 6, a hollow cylindrical core metal 86 is made of aluminum having good heat-conducting characteristics. An elastic layer 87 made of a heat-resistant material such as silicon rubber is formed on a metal material such as copper or iron, and a surface release layer 88 made of a fluororesin such as PTFE or PFA is formed on the elastic layer 87. It was formed.

The surface release layer 88 of the pressure transfer roller is PT.
70% by volume of nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as FE and PFA.
Composed of mixed composite material, radiation wavelength 5-10
The spectral emissivity in the wavelength range of μm is 0.15.

The conventional heating / conveying belt and the pressing / conveying roller will be described later for comparing the performance of the combination of the heating / conveying belt and the pressing / conveying roller of the fourth embodiment.

The conventional heating / conveying belt is the same as the heating / conveying belt shown in the fourth embodiment, and the physical property of the surface release layer is that the spectral emissivity in the wavelength range of 5 to 10 μm is 0. It is 9 or more. Further, the conventional pressurizing elastic conveying roller is the same as the conventional pressurizing conveying roller shown in the first embodiment, and the physical property of the surface release layer is that the wavelength of the radiation is 5 to 10 μm. Spectral emissivity in the region 0.9
That is all.

[Fifth Embodiment of Combination of Heating and Conveying Rotating Body and Pressurizing and Conveying Rotating Body] The fifth embodiment is a self-heating type heat generating resistor roller and the pressure conveying roller of the first embodiment described above. -In combination with LA.

The self-heating type heating resistor roller will be described. The self-heating type heat-generating resistor roller 91, as shown in the sectional structure of FIG. 7, is made of a material such as aluminum, copper, iron, or another metal having good heat conduction characteristics, a heat-resistant synthetic resin such as phenol, or a ceramic material. An elastic layer 93, which also functions as an electric insulating layer made of heat-resistant elastic rubber such as silicon rubber or fluororubber, is formed on a hollow-cylindrical cored bar 92 made of, and an electric insulating layer 94 and a heating resistor are formed on the elastic layer 93. The body layer 95, the electrically insulating layer 96, and the surface release layer 97 are sequentially laminated and configured.

The surface release layer 97 is made of a fluororesin such as PTFE or PFA. As for the physical properties of the surface release layer, the spectral emissivity in the wavelength range of radiation of 5 to 10 μm is 0.9 or more, and the thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10.
It is in the range of about ^-4 cal / (deg.cm.s).

The pressure-conveying roller is the same as the pressure-conveying roller of the first embodiment. As shown in the sectional structure of FIG. 7, the hollow cylindrical core metal 101 is made of aluminum having good heat conduction characteristics. An elastic layer 102 made of a heat-resistant material such as silicon rubber is formed on a metal material such as copper or iron, and a surface release layer 103 made of a fluororesin such as PTFE and PFA is formed on the elastic layer 102. It was formed.

The surface release layer 103 of the pressure transfer roller is P
Nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as TFE and PFA, in a volume ratio of 70
% Of the composite material, the wavelength of radiation is 5 to 1
The spectral emissivity in the wavelength range of 0 μm is 0.15.

The self-heating type heating resistor roll of the fifth embodiment will be described later.
A conventional self-heating type heat generation resistance roller and a pressure elastic transport roller will be described for the purpose of comparing the performance of a combination of a roller and a pressure elastic transport roller.

The conventional self-heating type heating resistor roller is the same as the self-heating type heating resistor roller shown in the fifth embodiment, and the physical properties of the surface release layer are such that the radiation wavelength is 5 to 10 μm.
The spectral emissivity in the wavelength range of m is 0.9 or more.
The conventional pressure-conveying roller is the same as the conventional pressure-conveying roller shown in the first embodiment, and the physical property of the surface release layer is that the wavelength of radiation is 5 to 10 μm. The spectral emissivity in the region is 0.9 or more.

[Explanation of Experimental Results] The results of experiments conducted under various conditions for the combination of the heating and conveying rotary member and the heating and conveying rotary member of the first to fifth embodiments will be described below.

The measurement of the spectral emissivity in this experiment was carried out by using a thermal radiation measuring device (Fourier conversion infrared spectrophotometer FT4200 manufactured by Shimadzu Corporation) and a thermal radiation measuring system (blackbody furnace, sample heating furnace). , Temperature controller)) is used to measure a temperature of 20 in the infrared region of a radiation wavelength of 5 to 10 μm.
It was carried out at 0 ° C.

The size of the sample for measuring the spectral emissivity was 10 × 50 mm. Further, in order to eliminate the influence of the surroundings of the sample, the measurement range was adjusted to 5 × 10 mm with an aperture and the measurement was performed. A high temperature black body paint (emissivity 0.9) was applied to half of the sample surface, and this was made into a pseudo black body.

The measurement method was as follows. First, the emission spectrum was measured using a pseudo-blackbody as a reference, and the temperature of the sample heating furnace was adjusted so that the emissivity was balanced at 90%. The sample was moved when the emissivity of the pseudo-blackbody reached 90%, and the emission spectrum of the sample to be measured was measured at that temperature.

[Experiment 1. Power Consumption in Heating / Conveying Rotating Body, Part 1] Power consumption in the heating / conveying rotating body was measured. The experiment was conducted by using the heating transfer roller and the pressure transfer roller of the first embodiment.
I went to the combination of LA.

The experimental method is as follows: First, a heating halogen heater arranged inside the heating and conveying roller via a temperature control circuit.
The heater is energized and heated, the surface temperature is detected by the temperature sensor, and the heater energization time is controlled so as to maintain the temperature suitable for the predetermined fixing. It was measured by.

FIG. 8 is a diagram showing the measurement results of the surface temperature and the electric power consumed for a certain period of time in the combination of the heating conveyance roller and the pressure conveyance roller according to the first embodiment. Shows the power consumption in the conventional combination of the heating transfer roller and the pressure transfer roller, and the line (b) shows the combination of the heating transfer roller and the pressure transfer roller according to the first embodiment of the present invention. Shows the power consumption in.

When the surface temperature of the heating / conveying roller is maintained at 200 ° C., as is apparent from the figure, the conventional heating / conveying roller consumes power of 290 KW / H. It can be seen that the pressure conveyance roller has a power consumption of 205 KW / H, and the power consumption is significantly reduced by about 30%.

This is because PTF is used as the surface release layer of the pressure transfer roller in the combination of the rollers of the first embodiment.
By using a material in which nickel, which is a good heat-conducting substance, is mixed in a volume ratio of 70% with a fluororesin such as E or PFA, the heat emissivity from the surface of the pressure-conveying roller can be increased by the conventional pressure-conveying. This is because the radiant heat that is smaller than the heat emissivity from the roller surface and is radiated from the surface of the heating and conveying roller is reflected by the surface of the pressure and conveying roller and returned to the heating and conveying roller. Conceivable.

The power consumption for maintaining the surface temperature of the heating / conveying roller increases as the target temperature to be maintained increases, but the spectral emissivity of the surface of the pressing / conveying roller is low. It can be seen that the rate of increase in power consumption decreases as the power consumption increases. That is, the higher the surface temperature of the heating conveyance roller, the pressure conveyance roller of the first embodiment (spectral emissivity 0.1).
The rate of increase in the power consumption of 5) is smaller than that of the conventional pressurized transport roller (spectral emissivity 0.9).

FIG. 9 shows the surface exposure of the metal in the surface release layer of the heating transport roller and the pressure transport roller for the combination of the heating transport roller and the pressure transport roller of the first embodiment. It is the figure which showed the result of having experimented about the relationship between a ratio and spectral emissivity (spectral emissivity in the wavelength range of 5 to 10 micrometers of radiation).

As is apparent from the figure, in the composite material of PTFE (fluorine resin) and nickel which constitutes the surface release layer of the heating and feeding roller and the nickel, the content of nickel is increased, That is, when the surface exposure ratio of nickel in the surface release layer increases, the spectral emissivity decreases. When the surface exposure ratio is 18%, the spectral emissivity is 0.65, and when the surface exposure ratio is 70%, the spectral emissivity is 0. It turns out that it will be 15.

FIG. 10 is a diagram showing the result of an experiment on the relationship between the surface exposure ratio of nickel in the surface release layer of the heating / conveying roller and the power consumption for the heating / conveying roller of the first embodiment. , The surface temperature of the heating and conveying roller is 200 ℃
It shows the case of maintaining. As is clear from the figure,
In the composite material of PTFE (fluorine resin) and nickel constituting the surface release layer of the heating and conveying roller, the power consumption is increased when the content of nickel is increased, that is, the surface exposure ratio of the nickel in the surface release layer is increased. When the nickel surface exposure rate is 20%, the power consumption becomes 255 KW / H, which is 10 compared to the power consumption of 285 KW / H of the conventional heating transfer roller having the surface release layer containing no nickel.
It can be seen that the power consumption decreases by more than%.

[Experiment 2. Power consumption in the rotating carrier
Part 2] An experiment was conducted on the influence of the difference in the material of the surface release layer of the pressure transfer roller on the power consumption. The experiment was carried out on a combination of the heating transfer roller and the pressure transfer roller of the first embodiment.

The experimental method is as follows: PT which is a release material.
A plurality of pressure transfer rollers having a surface release layer made of materials having different contents of nickel, which is a low-radioactive material for FE (fluorine resin), are prepared.

With respect to a plurality of pressure transfer rollers having a surface release layer made of materials having different nickel contents, a halogen heater for heating disposed inside the heat transfer roller via a temperature control circuit. The heater is energized and heated, the surface temperature is detected by the temperature detection sensor, the energization time of the heater is controlled so as to maintain a predetermined set temperature, and the amount of power consumed in a certain time is measured by an integrating wattmeter. . The set temperature is 120 ° C,
Experiments were conducted at three temperatures of 160 ° C and 200 ° C.

FIG. 11 shows 120 ° C., 160 ° C. and 200 ° C.
At each surface temperature, the content of nickel in PTFE (fluorine resin), which is the release material of the surface release layer of the pressure transfer roller, that is, the exposure ratio of nickel in the surface release layer, and the heating transfer It is a figure which shows the experimental result about the power consumption and relationship in a roller.

As is clear from the figure, the nickel content and the power consumption with respect to PTFE (fluorine resin) forming the surface release layer of the pressure transfer roller are low-radiation materials, which are approximate to linear expressions. It can be seen that the power consumption increases as the nickel content decreases. This is because the smaller the nickel content is, the less the amount of radiant heat radiated from the surface of the heating / conveying roller is reflected by the pressure / conveying roller, and the less the heat is returned to the heating / conveying roller. It is thought to be because.

FIG. 12 shows, as an experiment related to the above experiment, that the surface temperature of the heating / conveying roller was 120 ° C., 160 ° C.
Experiments on the relationship between the spectral emissivity in the wavelength range of 5 to 10 μm of the radiation of the surface release layer of the pressure transfer roller and the power consumption of the heating transfer roller at each temperature of 200 ° C. It is a figure which shows a result.

As is clear from the figure, in the conventional pressure transfer roller in which the surface release layer has a spectral emissivity of 0.9, in order to maintain the surface temperature of the heating transfer roller at 200.degree. , 27
What is 5 kW / H, the surface release layer has a spectral emissivity of 0.65.
It is 0 kW / H, indicating that power consumption can be reduced by 10% or more.

Further, the higher the surface temperature of the heating / conveying roller, the larger the difference in power consumption between the conventional pressing / conveying roller and the pressing / conveying roller of the present invention. This means that in a high-speed image forming apparatus in which the surface temperature of the heating / conveying roller is set high, the power consumption saving effect is further increased.

[Experiment 3. Combination of Conveying Rotators Having Different Spectral Emissivities and Power Consumption] The relationship with the power consumption was tested for a combination of a plurality of heating conveying rollers having different spectral emissivities and a pressure conveying roller.

The experiment was carried out using a heating transfer roller and a pressure transfer roller each having a different spectral emissivity of the surface release layer.
The combinations shown in Table 1 were created, and the power consumption was measured for each combination.

[0089] The experimental method is to prepare a heating transport roller and a pressure transport roller of the above combination, and electrically heat the halogen heater for heating arranged inside the heating transport roller via a temperature control circuit. The surface temperature was detected by a temperature detection sensor, the energization time of the heater was controlled so as to maintain a temperature suitable for a predetermined fixing, and the amount of power consumed in a certain time was measured by an integrating wattmeter.

FIG. 13 is a diagram showing the experimental results, and the line (a) is shown.
Is a heating transfer roll whose surface release layer has a spectral emissivity of both 0.9.
The power consumption in the combination of the roller and the pressure transfer roller, line (b) shows that the conventional heating transfer roller (spectral emissivity of the surface release layer is 0.9) and the spectral emissivity of the surface release layer are 0. Power consumption in combination with a pressure transfer roller of 0.15, line (c)
Is a heating transfer roller in which the surface release layer has a spectral emissivity of 0.65 and a conventional pressure transfer roller (the surface release layer has a spectral emissivity of 0.
The power consumption in the combination with 9) and the line (d) are the power consumption in the combination of the heating transfer roller and the pressure transfer roller in which the spectral emissivity of the surface release layer is 0.65, and the line (e). ) Indicates power consumption in a combination of a heating conveyance roller having a surface release layer having a spectral emissivity of 0.65 and a pressure conveyance roller having a surface release layer having a spectral emissivity of 0.15.

As is clear from this figure, the heating and conveying roll is
Power consumption can be reduced by reducing the spectral emissivity of the surface release layer of the roller and the pressure transfer roller, and the pressure transfer can be performed more than the spectral emissivity of the surface release layer of the heating transfer roller. It can be seen that the power consumption can be further reduced by reducing the spectral emissivity of the surface release layer of the roller.

It is advantageous that the surface release layers of the heating transport roller and the pressure transport roller are made of a material having a small spectral emissivity, because the power consumption can be reduced, but the spectral emissivity is small. Therefore, if the content of the low-radioactive material (for example, nickel) to the release material (for example, PTFE (fluorine resin)) is increased, the release performance gradually decreases.

Since the heating / conveying roller is brought into direct contact with the unfixed toner image to fuse and fix the toner image, the surface release layer must secure sufficient releasability. For this reason, the material of the surface release layer of the heating / conveying roller is naturally limited in the content ratio of the low emissivity material to the release material. On the other hand, since the pressure-conveying roller does not directly contact the unfixed toner image to fuse and fix the toner image, the releasability required for the surface releasing layer is the surface releasing of the heating-conveying roller. Release properties as high as required for the layers are not required. Therefore, in the material of the surface release layer of the pressure transfer roller, the content of the low emissivity material can be increased and the spectral emissivity can be made smaller than that of the material of the surface release layer of the heating transfer roller. it can.

The above experiment was carried out for the combination of the heating transfer roller and the pressure transfer roller of the first embodiment.
Almost similar results could be obtained for the combinations of the heating and transporting rotary body and the pressurizing and transporting rotary body of the examples to the fifth examples.

[0095]

As described above, the fixing device of the image forming apparatus of the present invention has the surface release layer provided on the contact surfaces of the heating and conveying rotary member and the pressing and conveying rotary member, and the conveying under pressure is carried out. The surface release layer of the rotator is made of a material having a spectral emissivity in the wavelength range of 5 to 10 μm smaller than the spectral emissivity of the surface release layer of the heating and conveying rotator in the wavelength range. , The surface temperature of the heating and conveying rotary member can be controlled to be lower than the surface temperature of the conventional heating and conveying rotary member while maintaining the required fixing strength of the toner, and a heat diffusion preventing means such as a heat insulating material is taken. Without it, it can reduce heat loss and power consumption.

Since the surface temperature of the heating and conveying rotary member can be controlled to be lower than the surface temperature of the conventional heating and conveying rotary member, an operation start command is issued when the image forming apparatus is in a standby state or the like. Also has an excellent effect such that the fixing operation can be started in an extremely short time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a copying apparatus to which a fixing device to which the present invention is applied is applied.

FIG. 2 is a cross-sectional view showing the configuration of a fixing device.

FIG. 3 is a cross-sectional view showing a combination of a heating conveyance roller and a pressure conveyance roller according to the first embodiment.

FIG. 4 is a cross-sectional view showing a combination of a heating conveyance roller and a pressure conveyance roller according to the second embodiment.

FIG. 5 is a sectional view showing a combination of a heating / conveying roller and a pressure / conveying roller according to the third embodiment.

FIG. 6 is a sectional view showing a combination of a heating / conveying belt and a pressure / conveying roller according to a fourth embodiment.

FIG. 7 is a sectional view showing a combination of a self-heating type heating resistor roller and a pressure transfer roller according to a fifth embodiment.

FIG. 8 is a diagram showing an experimental result of a relationship between a surface temperature of a heating and conveying roller and power consumption.

FIG. 9 is a diagram showing an experimental result of a relationship between a surface exposure ratio of a metal contained in a surface release layer and a spectral emissivity.

FIG. 10 is a diagram showing an experimental result of a relationship between a surface exposure ratio of a metal contained in a surface release layer and a spectral emissivity.

FIG. 11 is a diagram showing an experimental result of the relationship between the surface exposure ratio of the metal contained in the surface release layer of the pressure transfer roller and the power consumption.

FIG. 12 is a diagram showing an experimental result of a relationship between a spectral emissivity of a surface release layer and power consumption.

FIG. 13 is a diagram showing an experimental result of the relationship between the surface temperature of the heating / transporting rotary body and the power consumption for combinations of various heating / transporting rotary bodies having different spectral emissivities of the surface release layer and the pressurized transporting rotary body. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Original plate 3 Scanning optical system 5 Paper feeding section 10 Photosensitive drum 20 Fixing device 21 Heat transfer roller (Heating transfer roller) 22, 27 Core metal 23 Surface release layer 24 Halogen heater 25 Temperature detection sensor 26 Addition Pressure transfer rotator (pressure transfer roller) 28 Silicon rubber layer 29 Surface release layer

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[Procedure amendment]

[Submission date] September 13, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Claim 7

[Correction method] Change

[Correction contents]

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above problems. In the invention of claim 1, a heating conveyance rotary member and a pressure conveyance rotary member for heating and fixing a toner image formed on a recording medium. In the fixing device of the image forming apparatus provided with the fixing unit, the heating and transporting rotary member and the pressing and transporting rotary member each have a release layer on the surface , spectral emissivity in the wavelength range of the wave length of 5 to 10μm, characterized in that is composed of less material than the spectral emissivity in the wavelength band of the release layer of the heating conveyor rotating member.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] Then, release layer of the pressure conveying rotating body, the spectral emissivity in the wavelength range of the wave length of 5 to 10μm is 0.65 or less.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009] Among the surface release layer of the heating conveyor rotating member and the pressure conveying rotating body, at least the pressure conveying rotating body surface release layer of a release material and a wave length of 5 to a wavelength range of 10μm It is preferable to use a composite material with a material having a spectral emissivity less than the above-mentioned release material.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

According to a fourth aspect of the present invention, in the fixing device of the image forming apparatus, the fixing device includes a fixing unit that includes a heating and conveying rotary member that heats and fixes the toner image formed on the recording medium, and a pressing and conveying rotary member. Each of the heating and transporting rotary body and the pressurized and transporting rotary body has a surface release layer composed of a composite material of a releasing material and a low-radioactive material. low emissivity material of the composite material constituting the mold layer, the spectral emissivity in the wavelength range of the wave length of 5 to 10μm is 0.65 or more

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The release material of the composite materials forming the surface release layer of the heating and transporting rotary body and the pressurizing and transporting rotary body is one or more fluororesins or silicon rubbers, and has low radioactivity. The material may be one or more metals or metal alloys.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

The physical properties of the release layer of the heating conveyor roller is in the wavelength range of the wave length 5~10μm spectral emissivity in the (infrared region) is 0.9 or more, the thermal conductivity is 6.0 × 10
^{-4 to} 7.0 × 10 ^-4 cal / (deg · cm · s)
The surface roughness Rz of the surface release layer (10-point average roughness, unit: μm, hereinafter simply referred to as Rz) is 40.
μm or less.

[Procedure amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction contents]

The surface release layer 29 of the pressure conveyance roller is P
Nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as TFE and PFA, in a volume ratio of 70
% Mixed constructed from a composite material, constituted as spectral emissivity in the wavelength range of the wave length 5~10μm is smaller than the spectral emissivity in the wavelength range of the wave length 5~10μm the release layer of the heating conveyor roller To do.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

The physical properties of the release layer of the pressure圧搬feed roller, the spectral emissivity in the wavelength range of the wave length 5~10μm is 0.15.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction contents]

The conventional heating / conveying roller is the same as the heating / conveying roller of the first embodiment, and the physical properties of the surface release layer are
Spectral emissivity in the wavelength range of the wave length 5~10μm 0.9
Or more, although the conventional pressurized圧搬feed roller is approximately the same as the pressure圧搬feed roller of the first embodiment, the physical properties of the release layer are different, spectrally in the wavelength range of the wave length 5~10μm The emissivity is 0.9 or more.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

The physical properties of the release layer 64, wavelength 5
Spectral emissivity in the wavelength range of 10 μm is 0.9 or more,
The thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal.
It is about / (deg · cm · s). The surface roughness Rz of the surface release layer is 40 μm or less.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

Surface release layer 68 of pressure-conveying roller 65
Is, PTFE, is composed of a composite material obtained by mixing 70% metal in which nickel (powder) in a volume ratio exhibits good thermal conductivity to fluorine resin such as PFA, wavelength 5-10
The spectral emissivity in the wavelength range of μm is 0.15.

[Procedure amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction contents]

[0042] Conventional heat conveying roller is the same as that of the conventional heat conveying roller shown in the second embodiment, the physical properties of the release layer is spectral emissivity in the wavelength range of the wave length 5~10μm is It is 0.9 or more. Further, the conventional pressure-conveying roller is the same as the conventional pressure-conveying roller shown in the first embodiment, and the physical properties of the surface release layer are
Spectral emissivity in the wavelength range of the wave length 5~10μm is 0.
It is 9 or more.

[Procedure amendment 18]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction contents]

The physical properties of the release layer 74, wavelength 5
Spectral emissivity in the wavelength range of 10 μm is 0.9 or more,
The thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal.
It is about / (deg · cm · s). The surface roughness Rz of the surface release layer is 40 μm or less.

[Procedure amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

Surface release layer 77 of pressure conveyance roller 75
Is, PTFE, is composed of a composite material obtained by mixing 70% metal in which nickel (powder) in a volume ratio exhibits good thermal conductivity to fluorine resin such as PFA, wavelength 5-10
The spectral emissivity in the wavelength range of μm is 0.15.

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction contents]

[0049] Conventional heat conveying roller is the same as that of the conventional heat conveying roller shown in the second embodiment, release layer physical properties spectral emissivity in the wavelength range of the wave length 5~10μm of, It is 0.9 or more.

[Procedure amendment 21]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

[0050] Further, the conventional pressure圧弾of conveying rollers, the same as the conventional pressure圧弾of conveyance rollers shown in the first embodiment, the physical properties of the release layer is wavelength 5~10μm
Has a spectral emissivity of 0.9 or more.

[Procedure amendment 22]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction contents]

[0054] Physical properties of the release layer 83, wavelength 5
Spectral emissivity in the wavelength range of 10 μm is 0.9 or more,
The thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ⁻⁴ cal.
It is about / (deg · cm · s). The surface roughness Rz of the surface release layer is 40 μm or less.

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction contents]

The surface release layer 88 of the pressure conveyance roller is P
Nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as TFE and PFA, in a volume ratio of 70
% Mixed constructed from a composite material, the spectral emissivity in the wavelength range of the wave length 5~10μm is 0.15.

[Procedure amendment 24]

[Document name to be amended] Statement

[Correction target item name] 0058

[Correction method] Change

[Correction contents]

[0058] Conventional heating conveyor belt, the same as the heating conveyor belt shown in the fourth embodiment, release layer physical properties spectral emissivity in the wavelength range of the wave length 5~10μm of 0.9 That is all. Further, the conventional pressure圧弾of conveying rollers is the same as the conventional pressure圧搬feed roller shown in the first embodiment, the physical properties of the release layer is wavelength 5~10μ
The spectral emissivity in the wavelength range of m is 0.9 or more.

[Procedure amendment 25]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction contents]

The surface release layer 97 is made of a fluororesin such as PTFE or PFA. The physical properties of the surface release layer are
Spectral emissivity in the wavelength range of the wave length 5~10μm 0.9
As described above, the thermal conductivity is 6.0 × 10 ^{−4 to} 7.0 × 10 ^−4.
It is in the range of about cal / (deg.cm.s).

[Procedure amendment 26]

[Document name to be amended] Statement

[Correction target item name] 0063

[Correction method] Change

[Correction contents]

The surface release layer 103 of the pressure conveyance roller is
Nickel (powder), which is a metal showing good thermal conductivity with respect to fluororesins such as PTFE and PFA, in a volume ratio of 7
It consists 0% mixed composite material, the wave length 5~10μm
The spectral emissivity in the wavelength region of is 0.15.

[Procedure amendment 27]

[Document name to be amended] Statement

[Correction target item name] 0065

[Correction method] Change

[Correction contents]

[0065] Conventional self-heating type heating resistor roller is the same as the self-heating type heating resistor roller shown in the fifth embodiment, the physical properties of the release layer is spectral in the wavelength band of the wavelength 5~10μm The emissivity is 0.9 or more. Further, the conventional pressure圧搬feed roller, the same as the conventional pressure圧搬feed roller shown in the first embodiment, the physical properties of the release layer is spectral emissivity in the wavelength range of the wave length 5~10μm Is 0.9 or more.

[Procedure amendment 28]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction contents]

The measurement of the spectral emissivity in this experiment was performed by using a thermal radiation measurement device (Fourier transform infrared spectrophotometer FT4200 manufactured by Shimadzu Corporation) and a thermal radiation measurement system (blackbody furnace, sample heating furnace, temperature using the controller)), measurement temperature 2 in the infrared region of wavelength 5~10μm
It was carried out at 00 ° C.

[Procedure amendment 29]

[Document name to be amended] Statement

[Correction target item name] 0073

[Correction method] Change

[Correction contents]

When the surface temperature of the heating / conveying roller is maintained at 200 ° C., the power consumption of the conventional heating / conveying roller is 290 WH / H , as apparent from the figure. It is 205 WH / H , which means that the power consumption is significantly reduced by about 30%.

[Procedure amendment 30]

[Document name to be amended] Statement

[Correction target item name] 0076

[Correction method] Change

[Correction contents]

[0076] Figure 9 is a heat conveying roller and a pressure圧搬feed combinations of rollers, heating the conveying roller and the pressurizing圧搬feed surface exposure ratio and the spectral emissivity of the metal in the release layer of the roller of the first embodiment (wavelength It is the figure which showed the result of having experimented about the relationship with the spectral emissivity in the wavelength range of 5-10 micrometers.

[Procedure amendment 31]

[Document name to be amended] Statement

[Correction target item name] 0078

[Correction method] Change

[Correction contents]

FIG. 10 is a diagram showing the results of experiments on the relationship between the surface exposure ratio of nickel in the surface release layer of the heating and conveying roller and the power consumption of the heating and conveying roller of the first embodiment. Surface temperature is 200 ℃
Shows the case of maintaining. As is clear from the figure, in the composite material of PTFE (fluorine resin) and nickel which constitutes the surface release layer of the heating and conveying roller, the content of nickel increases, that is, the surface exposure ratio of nickel in the surface release layer increases. When it increases, the power consumption decreases, and when the nickel surface exposure rate is 20%, the power consumption becomes 255 WH / H ,
It can be seen that the power consumption is reduced by 10% or more from the power consumption of 285 WH / H of the conventional heating and conveying roller having the surface release layer containing no nickel.

[Procedure amendment 32]

[Document name to be amended] Statement

[Correction target item name] 0083

[Correction method] Change

[Correction contents]

As is clear from the figure, the content rate of nickel and the power consumption of PTFE (fluororesin) constituting the surface release layer of the pressure conveyance roller are approximate to a linear expression,
It can be seen that the power consumption increases as the nickel content, which is a low-emissivity material, decreases. This is considered to be because as the nickel content decreases, the amount of radiant heat radiated from the surface of the heating and conveying roller is reflected by the pressure and conveying roller, and the heat returned to the heating and conveying roller decreases.

[Procedure amendment 33]

[Document name to be amended] Statement

[Correction target item name]

[Correction method] Change

[Correction contents]

FIG. 12 shows, as an experiment related to the above experiment, that the surface temperature of the heating and conveying roller is 120 ° C., 160 ° C.
Indicating in each case the temperature of 200 ° C., the spectral emissivity in the wavelength range of the wave length of 5 to 10μm of surface release layer of pressurized圧搬feeding roller, the line of ivy experimental results about power consumption relationship in heat conveying roller It is a figure.

[Procedure amendment 34]

[Document name to be amended] Statement

[Correction target item name] 0095

[Correction method] Change

[Correction contents]

[0095]

As described above, the fixing device of the image forming apparatus of the present invention has the surface release layer provided on the contact surfaces of the heating and conveying rotary member and the pressing and conveying rotary member, and the conveying under pressure is carried out. since the spectral emissivity of wavelength of the surface releasing layer of the rotating body in the wavelength range of 5 to 10μm was constructed with less material than the spectral emissivity in the wavelength band of the release layer of the heating conveyor rotating member, The surface temperature of the heating / transporting rotor can be controlled to be lower than the surface temperature of the conventional heating / transporting rotor while maintaining the required fixing strength of the toner, without using a heat diffusion preventing means such as a heat insulating material. It can reduce heat loss and power consumption.

Claims (8)

[Claims] 1. A fixing device of an image forming apparatus, comprising a fixing means composed of a heating / conveying rotating body for heating and fixing a toner image formed on a recording medium, and a pressing / conveying rotating body. And the pressure-conveying rotary member has a release layer on the surface thereof, and the spectral emissivity of the surface release layer of the pressure-conveying rotating member in the wavelength range of 5 to 10 μm of the radiation has a spectral emissivity of that of the heating transfer rotor. A fixing device for an image forming apparatus, comprising a material having a spectral emissivity smaller than that of the surface release layer in the wavelength range. 2. The image forming according to claim 1, wherein the surface release layer of the pressure-conveying rotator has a spectral emissivity of 0.65 or less in a wavelength range of radiation of 5 to 10 μm. Fixing device of the device. 3. Among the surface release layers of the heating and transporting rotary member and the pressure transporting rotary member, at least the surface release layer of the pressurizing and transporting rotary member has a wavelength of 5 to 10 μm of the release material and radiation. 2. The fixing device for an image forming apparatus according to claim 1, wherein the fixing device is formed of a composite material of a material having a spectral emissivity in a region smaller than the release material. 4. A fixing device of an image forming apparatus, comprising a fixing means composed of a heating / conveying rotary member for heating and fixing a toner image formed on a recording medium, and a pressing / conveying rotating member. And the pressure transfer rotary body has a surface release layer composed of a composite material of a release material and a low emissivity material, and constitutes the surface release layer of the heating transfer rotary body and the pressure transfer rotary body. The low-emissivity material of the composite material has a spectral emissivity of 0.6 in the wavelength range of 5 to 10 μm.
A fixing device for an image forming apparatus, which is 5 or less. 5. The release material of the composite materials forming the surface release layer of the heating and transporting rotary body and the pressurizing and transporting rotary body is one or more fluororesins. Item 5. A fixing device for an image forming apparatus according to item 4. 6. The image according to claim 4, wherein the releasable material of the composite materials forming the surface release layer of the heating and transporting rotary body and the pressing and transporting rotary body is silicon rubber. Fixing device for forming device. 7. The low thermal emissivity material among the composite materials forming the surface release layer of the heating and transporting rotary body and the pressure and transporting rotary body is one or more metals or metal alloys. The fixing device of the image forming apparatus according to claim 4. 8. A fixing device of an image forming apparatus, comprising a fixing means composed of a heating / conveying rotator for heating and fixing a toner image formed on a recording medium and a pressure / conveying rotator. And the pressure transfer rotary body has a surface release layer composed of a composite material of a release material and a low emissivity material, respectively, of the low emission material contained in the surface release layer of the pressure transfer rotation body. The surface exposure rate is higher than the surface exposure rate of the low emissivity material contained in the surface release layer of the heating and conveying rotary member, and the fixing device of the image forming apparatus.