JP2001282029A - Fixing device and image forming device equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device and an image forming device equipped with the fixing device capable of always optimizing the carrying amount of a cleaning web and reducing the running cost of the cleaning web. SOLUTION: A web feeding solenoid 46 is set in accordance with the number of fixing processing times in the case of consecutive fixing processing so that the carrying amount of the cleaning web 41 per specified time gets larger as the number of fixing processing times becomes larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium for carrying an unfixed image, which is sandwiched and conveyed by the fixing member and the pressing member, and heated and pressed to record the unfixed image on the recording medium. The present invention relates to a fixing device and an image forming apparatus including the fixing device.

[0002]

2. Description of the Related Art Conventionally, in a fixing device provided in an image forming apparatus such as a copying machine and a printer using an electrophotographic method, a fixing roller serving as a fixing member and a pressing roller serving as a pressing member which rotate by pressing against each other. A fixing device including a heating unit for heating the fixing roller is known, and is practically used.

An unfixed image electrostatically formed with toner on the surface of a recording material as a recording medium is nipped and conveyed by a fixing roller and a pressure roller, and is heated and pressed to be fixed on the recording material. However, since the surface of the fixing roller comes into contact with the unfixed image, a so-called fixing offset occurs in which a part of the toner adheres to the surface of the fixing roller during a series of fixing operations.

In order to solve this problem, cleaning means is often provided on the surface of the fixing roller. As a general cleaning means, a cleaning pad for pressing the heat-resistant fiber against the fixing roller, a cleaning roller for winding the heat-resistant fiber around the cylindrical metal surface and rotating and sliding with the fixing roller, and rubbing the sheet-shaped heat-resistant fiber against the fixing roller. Cleaning webs and the like. In particular, the cleaning web is advantageous for a cleaning pad and a cleaning roller in cleaning performance and life, and is used in a monochrome high-speed machine and a full-color machine.

Here, FIG. 5 shows the structure of a general cleaning web.

[0006] The cleaning web 141 is supplied from a web supply shaft 142 and wound on a web winding shaft 143. Further, the cleaning web 141 is brought into contact with and pressed against the fixing roller 110a by the web pressing roller 144 to clean the surface of the fixing roller 110a.
The winding shaft 143 intermittently or continuously winds the cleaning web at a rate of several mm per 100 sheets fixed (per predetermined time) by a DC motor, a solenoid, or the like (not shown).

[0007]

However, in addition to the above advantages, the cleaning web has disadvantages of a large structure and high cost. Further, since the offset amount is not uniform depending on the number of fixing sheets and the offset amount differs between the initial stage and the final stage due to a decrease in the temperature of the fixing roller, the cleaning web may be sent more than necessary in the conventional web feed control. As a result, the running cost becomes expensive.

Accordingly, an object of the present invention is to provide a fixing device capable of always optimizing the transport amount of the cleaning web and reducing the running cost of the cleaning web, and an image forming apparatus including the fixing device.

[0009]

According to the present invention, an object of the present invention is to provide a recording medium having an unfixed image, comprising a fixing member and a pressing member which rotate by pressing against each other, and a heating means for heating the fixing member. A fixing device for recording the unfixed image on the recording medium by nipping and conveying the recording medium with the fixing member and the pressing member, and heating and pressing the fixing member. In a fixing device having a cleaning web for cleaning the surface of the fixing body by rubbing with the fixing body, and a web feeding means for conveying the cleaning web in a predetermined direction, the web feeding means is used for fixing during a continuous fixing process. This is achieved by the first invention in which the cleaning web transport amount per predetermined time is set to be larger as the number of fixing processes increases as the number of processes increases.

Further, according to the present application, the above object is achieved in the first aspect, wherein the web feeding means is a solenoid,
The present invention is also achieved by the second invention in which the cleaning web transport amount can be set by changing the operation frequency of the solenoid.

Further, according to the present application, the above object is achieved in the first aspect, wherein the web feeding means is a DC motor, and the cleaning web transport amount can be set by changing the rotation speed of the DC motor. This is also achieved by the third invention.

Further, according to the present application, the above object is achieved in the first aspect, wherein the web feed means is a DC motor,
The present invention is also achieved by the fourth invention in which the cleaning web transport amount can be set by changing the rotation frequency of the DC motor.

Further, according to the present application, the object is to provide an image forming apparatus for recording an image formed by a series of image forming processes, wherein the image forming apparatus includes the fixing device of the first invention. Is also achieved.

According to the present application, the above object is achieved according to the fifth aspect, wherein the web feeding means is a solenoid,
The present invention is also achieved by the sixth invention in which the cleaning web transport amount can be set by changing the operation frequency of the solenoid.

Further, according to the present application, the above object is achieved in the fifth aspect, wherein the web feeding means is a DC motor, and the cleaning web transport amount can be set by changing the rotation speed of the DC motor. This is also achieved by the seventh invention.

According to the present application, the above object is achieved according to the fifth aspect, wherein the web feed means is a DC motor,
The invention is also achieved by the eighth invention in which the cleaning web transport amount can be set by changing the rotation frequency of the DC motor.

That is, according to the first invention of the present application, the web feeding means determines that the larger the number of times of the fixing process is, the larger the number of times of the fixing process is during the continuous fixing process, the more the cleaning web transport amount per predetermined time is. To increase.

Further, in the second invention according to the present application, the solenoid changes the operation frequency in accordance with the number of times of the fixing process in the continuous fixing process, so that the larger the number of times of the fixing process, the more per predetermined time Increase the cleaning web transport amount.

Further, in the third invention according to the present application, the DC motor changes the rotation speed in accordance with the number of times of the fixing process in the continuous fixing process, so that the larger the number of times of the fixing process, the longer the predetermined time. Increase the cleaning web transport amount per contact.

In the fourth invention according to the present application, the DC motor changes the rotation frequency in accordance with the number of times of the fixing process in the continuous fixing process, so that the larger the number of times of the fixing process, the more the predetermined time. Increase the cleaning web transport amount per contact.

Further, in the fifth invention according to the present application, the web feeding means may be configured such that the larger the number of fixing processes, the larger the cleaning web transport amount per predetermined time in accordance with the number of fixing processes in the continuous fixing process. To increase.

In the sixth invention according to the present application, the solenoid changes the operation frequency in accordance with the number of times of the fixing process in the continuous fixing process. Increase the cleaning web transport amount.

Further, in the seventh invention according to the present application, the DC motor changes the rotation speed in accordance with the number of fixing processes in the continuous fixing process, so that the larger the number of fixing processes, the longer the predetermined time. Increase the cleaning web transport amount per contact.

In the eighth invention according to the present application, the DC motor changes the rotation frequency in accordance with the number of times of the fixing process in the continuous fixing process, so that the larger the number of times of the fixing process, the longer the predetermined time. Increase the cleaning web transport amount per contact.

[0025]

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

FIG. 1 is a sectional view showing a schematic configuration of a digital four-color full-color image forming apparatus as an example of an image forming apparatus according to the present invention.

The image forming apparatus shown in FIG. 1 has a lower digital color image printer section (hereinafter simply referred to as "printer section") I and an upper digital color image reader section (hereinafter simply referred to as "reader section") II. For example, based on the image of the document D read by the reader unit II,
The printer unit I forms an image on a recording material P as a recording medium.

Hereinafter, the configuration of the printer unit I and the configuration of the reader unit II will be briefly described.

The printer unit I has a photosensitive drum 1 as an image carrier that is driven to rotate in the direction of arrow R1. Around the photosensitive drum 1, the primary charger (charging unit) 2, the exposure unit 3, the developing unit (developing unit) 4, the transfer unit 5, the cleaning unit 6, the pre-exposure lamp 7, etc. Is arranged. Below the transfer device 5, that is, in the lower half of the printer unit I, a paper feed / conveyance unit 8 for the recording material P is arranged, and further above the transfer device 5, a separating unit 9 is arranged.
Further, a fixing device 10 serving as a fixing device and a paper discharge unit 11 are disposed downstream of the separating unit 9 (downstream in the conveying direction of the recording material P).

The photosensitive drum 1 has a substrate 1a on an aluminum drum and an OPC (organic optical semiconductor) photosensitive member 1b covering the back side thereof. The photosensitive drum 1 is driven in a predetermined direction in the direction of arrow R1 by driving means (not shown). Process speed (peripheral speed)
It is configured to be driven to rotate. The photosensitive drum 1 will be described later in detail.

The primary charger 2 includes a shield 2a having an opening at a portion facing the photosensitive drum 1, and a discharge wire 2b disposed inside the shield 2a in parallel with the bus of the photosensitive drum 1.
And a grid 2c disposed at the opening of the shield 2a to regulate the charging potential. A charging bias is applied to the primary charger 2 by a power supply (not shown), whereby the surface of the photosensitive drum 1 is uniformly charged to a predetermined polarity and a predetermined potential.

Exposure means 3 includes a laser output section (not shown) for emitting a laser beam based on an image signal from a reader section II described later, and a polygon mirror 3 for reflecting the laser beam.
a, a lens 3b, and a mirror 3c. The exposing means 3 is configured to irradiate the surface of the photosensitive drum 1 with the laser beam to expose the photosensitive drum 1 and remove an electric charge of an exposed portion to form an electrostatic latent image. In the present embodiment, the electrostatic latent image formed on the surface of the photosensitive drum 1 is
Based on the original image, yellow, cyan, magenta,
The color is separated into four colors of black, and an electrostatic latent image corresponding to each color is sequentially formed.

The developing device 4 has four developing units in order from the upstream side along the rotation direction of the photosensitive drum 1 (direction of arrow R1), that is, each color of yellow, magenta, cyan, and black, each of which is made of resin. Developing devices 4Y, 4C, 4M, and 4Bk containing the toner (developer). Each of the developing units 4Y, 4C, 4M, and 4Bk has a developing sleeve 4a for attaching toner to the electrostatic latent image formed on the surface of the photosensitive drum 1, and a predetermined color used for developing the electrostatic latent image. The developing unit is alternatively arranged at a developing position close to the surface of the photosensitive drum 1 by the eccentric cam 4b, and the toner is attached to the electrostatic latent image via the developing sleeve 4a, and a toner image (visible image) Image). The three color developing units other than the developing unit used for the development are retracted from the developing position.

The transfer device 5 includes a transfer drum (recording material carrying pair) 5a that carries the recording material P on the surface, a transfer charger 5b that transfers the toner image on the photosensitive drum 1 to the recording material P, and a recording material P.
Charger 5c for attracting the toner to the transfer drum 5a, a suction roller 5d opposed thereto, an inner charger 5e, and an outer charger 5f, and the transfer is rotatably driven in the direction of arrow R5. A recording material carrying sheet 5g composed of a dielectric pair is integrally stretched in a cylindrical shape in a peripheral opening area of the drum 5a. As the recording material supporting sheet 5g, a dielectric sheet such as a polycarbonate film is used. Transfer device 5
Is configured to adsorb and carry the recording material P on the surface of the transfer drum 5a.

The cleaning device 6 includes a cleaning blade 6a for scraping off residual toner remaining on the surface of the photosensitive drum 1 without being transferred to the recording material P, and a cleaning container 6b for collecting the scraped toner.

The pre-exposure lamp 7 is disposed adjacent to the upstream side of the primary charger 2 and removes unnecessary charges on the surface of the photosensitive drum 1 cleaned by the cleaner 6.

The paper feeding and conveying section 8 is provided with recording materials P of different sizes.
Paper feed cassette 8a for stacking and storing paper, a paper feed roller 8b for feeding the recording material P in the paper feed cassette 8a, a number of transport rollers, a registration roller 8c, and the like, and a recording material of a predetermined size. P is supplied to the transfer drum 5a.

The separating means 9 is provided for the recording material P after the transfer of the toner image.
Charger 9a for separating the toner from the transfer drum 5a,
It has a separation claw 9b and a separation push-up roller 9c.

The fixing device 10 has a fixing roller 10a having a heater inside, and a pressure roller 10b disposed below the fixing roller 10a and pressing the recording material P against the fixing roller 10a. ing.

The paper discharge unit 11 includes a conveyance path switching guide 11 a and a discharge roller 11 which are disposed downstream of the fixing device 10.
b, a paper discharge tray 11c and the like. Also, below the conveyance path switching guide 11a, a conveyance vertical path 11d for forming an image on both sides of one recording material P,
Reversing path 11e, loading member 11f, intermediate tray 11g,
Further, transport rollers 11h and 11i, a reversing roller 11j and the like are arranged.

Between the primary charger 2 and the developing device 4 around the photosensitive drum 1, there is provided a potential sensor S1 for detecting the charged potential on the surface of the photosensitive drum, and between the developing device 4 and the transfer drum 5a. Is provided with a density sensor S2 for detecting the density of the toner image on the photosensitive drum 1.

Next, the reader section II will be described.

A reader unit II disposed above the printer unit I includes an original table glass 12a on which an original D is placed, and an exposure lamp 12 which exposes and scans the image surface of the original D while moving.
b, a plurality of mirrors 12c for further reflecting the reflected light from the document D, a lens 12d for condensing the reflected light, and a full-color sensor 12e for forming a color-separated image signal based on the light from the lens 12d. ing. The color-separated image signal is processed by a video processing unit (not shown) through an amplifier circuit (not shown), and is sent to the above-described printer unit I.

Next, the operation of the image forming apparatus having the above configuration will be described.
A brief description will be given while adding some components. In the following description, it is assumed that four full-color images are formed in the order of yellow, cyan, magenta, and black.

The image of the original D placed on the original platen glass 12a of the reader unit II is irradiated by an exposure lamp 12b, color-separated, and the yellow image is first read by a full-color sensor 12e and subjected to predetermined processing. The image data is sent to the printer unit I as an image signal.

In the printer section I, the photosensitive drum 1 has an arrow R
It is driven to rotate in one direction, and the surface is uniformly charged by the primary charger 2. A laser beam is emitted from a laser output unit of the exposure unit 3 based on the image signal sent from the reader unit II, and the charged photosensitive drum 1 surface is exposed by a light image E via a polygon mirror 3a and the like. I do. The exposed portion of the surface of the photosensitive drum 1 has its charge removed, whereby an electrostatic image corresponding to yellow is formed.

In the developing device 4, a yellow developing device 4Y is arranged at a predetermined developing position, and the other developing devices 4Y are arranged.
C, 4M, and 4Bk are retracted from the developing position. The electrostatic latent image on the photosensitive drum 1 has yellow toner attached thereto by the developing device 4Y and is visualized to be a toner image.

The yellow toner image on the photosensitive drum 1 is transferred to the recording material P carried on the transfer drum 5a. The recording material P is supplied to the transfer drum 5a at a predetermined timing from a predetermined paper feeding cassette 8a having a size suitable for a document image via a paper feeding roller 8b, a conveying roller, a registration roller 8c, and the like. Things. The recording material P supplied in this manner is attracted so as to wind around the surface of the transfer drum 5a, rotates in the direction of arrow R5, and the yellow toner image on the photosensitive drum 1 is transferred by the transfer charger 5b. Becomes

On the other hand, the photosensitive drum 1 after the transfer of the toner image
The residual toner on the surface is removed by the cleaning device 6, and unnecessary charges are further removed by the pre-exposure lamp 7, so that the image is provided for the next image formation starting from the primary charger.

The processes from the reading of the original image by the reader unit II, the transfer of the toner image to the recording material P on the transfer drum 5a, the cleaning of the photosensitive drum 1, and the elimination of electricity are performed by other processes than yellow. The same applies to the colors, that is, cyan, magenta, and black.
A toner image of four colors is transferred onto the recording material P on a in such a manner as to overlap.

Recording material P to which four color toner images have been transferred
Is separated from the transfer drum 5a by a separation charger 9a, a separation claw 9b, and the like, is conveyed to the fixing device 10 in a state where an unfixed toner image is carried on the surface, and is heated and pressed by the fixing roller 10a and the pressure roller 10b. Then, the toner image on the surface is fused and fixed.

The recording material P after fixing is discharged onto a discharge tray 11c by a discharge roller 11b. The recording material P
When an image is formed on both sides of the recording medium P, the fixing device 10 immediately drives the conveyance path switching guide 11a, guides the discharged recording material P to the reversing path 11e via the conveying vertical path 11d, and then reverses the recording material P. The roller 11j retreats in a direction opposite to the direction in which the paper is fed, with the rear end of the paper being fed by the reverse rotation, and is stored in the intermediate tray 11g. After that, an image is formed on the other surface again by the above-described image forming process, and then discharged onto the discharge tray 11c.

In the transfer drum 5a after the separation of the recording material P, in order to prevent the powder from adhering to the recording material supporting sheet 5g and the oil from adhering to the recording material P, the recording material supporting sheet 5g Fur brush 1 facing each other through
Cleaning is performed by 3a and the backup brush 13b, and by the oil removing roller 14a and the backup brush 14b. Note that such cleaning is performed before or after image formation, and is performed as needed when a jam (paper jam) occurs.

Next, the fixing device 10 will be described with reference to FIG.

In the figure, a fixing roller 10a is composed of a 1.2 mm thick silicone rubber layer 32 on a hollow 0.7 mm thick iron core bar 31 and a 50 μm thick PFA on the outside thereof.
It has a tube layer 33 and has a diameter of 40 mm.

On the other hand, the pressure roller 10b has a 5 mm thick silicone rubber layer 35 on a solid iron core 34, and a 50 μm thick PFA tube layer 36 thereon.
It is formed to have a diameter of 30 mm.

In the fixing roller 10a, halogen heaters 37 and 38, which are heat generating means, are provided in the metal core 31. The temperature of the fixing roller 10a is detected by a thermistor 39 disposed in contact with the fixing roller 10a, and the halogen heaters 37 and 38 are controlled by the control device 40 based on the detected temperature, so that the temperature of the fixing roller 10a becomes constant. Will be maintained.

The fixing roller 10a and the pressure roller 10b
Is pressurized at a total pressure of about 30 kg by a pressurizing mechanism (not shown). When the recording material P is fixed, the fixing roller 10a and the pressure roller 10b are rotating at a process speed of 100 mm / sec.

In the above-mentioned fixing device 10, the recording material P carrying the unfixed toner image on the surface is placed in the fixing nip between the fixing roller 10a and the pressure roller 10b with the surface of the toner image facing the fixing roller 10a. The sheet is nipped and conveyed, and is heated and pressurized at this time to fix the toner.

The cleaning web 41 is supplied from a web supply shaft 42 and wound on a web winding shaft 43. The cleaning web 41 abuts and is pressed against the fixing roller 10a by the web pressing roller 44 to clean the surface of the fixing roller 10a.

In the present embodiment, the web take-up shaft 43 is rotated in one direction by turning on / off a web feed solenoid 46 serving as web feed means via a one-way clutch 45, and the cleaning web 41 is taken up. In this embodiment, the cleaning web of about 0.5 mm is wound by one ON operation of the web feed solenoid 46. Also, the web supply shaft 42
Is preliminarily wound with a cleaning web of about 10 m.

Next, a web feeding sequence in this embodiment will be described with reference to FIG.

The number of times of fixing in the continuous fixing process (hereinafter referred to as the number of continuously fixed images) is detected from a signal from the operation panel of the copying machine or a printer driver (S101).

If the number of continuously fixed sheets is five or less, the web feed solenoid is turned on once for every ten fixed sheets (S102). In this case, the cleaning web feed amount per fixing sheet is 0.05 mm.

If the number of continuously fixed sheets is six or more, the web feed solenoid is turned ON once for every four fixed sheets (S103). In this case, the cleaning web feed amount per fixing sheet is 0.125 mm.

The feed amount of the cleaning web was 0.05 mm in Comparative Example 1 and 0.125 in Comparative Example 2.
mm.

In this embodiment and the comparative example described above, the durability was evaluated by randomizing the number of continuous fixing sheets. In Comparative Example 1, the life of the cleaning web was 200 k, but the number of continuous fixing sheets was large (for example, 100 sheets of continuous fixing). In the case of (sheet fixing), an image defect due to a cleaning defect occurred. In Comparative Example 2, no image failure due to cleaning failure occurred, but the life of the cleaning web was 80 k.

FIG. 4 shows the cleaning web life when the embodiment of the present invention is used.

In this embodiment, even when the number of continuously fixed sheets is large, no image failure due to cleaning failure occurs, and the life of the cleaning web can be improved.

In the present embodiment, the web solenoid is operated intermittently. However, the amount of the cleaning web sent by one operation of the web solenoid may be reduced, and the web solenoid may be continuously operated. For example, when the cleaning web is fed by 0.05 mm by one operation of the web solenoid and the web solenoid is turned ON once for each fixing operation, when the full-color continuous fixing is 6 sheets or more. In this case, the web solenoid may be turned on twice for each fixing operation.

The structure for feeding the cleaning web is not limited to the solenoid, and the cleaning web may be sent by rotation of a DC motor or the like.

Further, in the present embodiment, the cleaning web feed amount is changed only in one stage, but is not limited to one stage. For example, when the number of continuous fixing sheets is 20 or more, the cleaning web feed amount is further increased. It may be changed in a plurality of stages such as changing.

[0073]

As described above, according to the first aspect of the present invention, the web feeding means determines that the larger the number of times of the fixing process is, the larger the number of times of the fixing process in the continuous fixing process is, Since the cleaning web transport amount is increased, the cleaning web transport amount can always be optimized, and the running cost of the cleaning web can be reduced.

According to the second invention of the present application,
Since the solenoid changes the operation frequency in accordance with the number of times of the fixing process in the continuous fixing process, the larger the number of times of the fixing process, the larger the cleaning web transport amount per a predetermined time. And the running cost of the cleaning web can be reduced.

Further, according to the third aspect of the present invention, the DC motor changes the rotation speed in accordance with the number of times of the fixing process in the continuous fixing process, so that the larger the number of times of the fixing process, the more the predetermined time per predetermined time. Since the cleaning web transport amount is increased, the cleaning web transport amount can always be optimized, and the running cost of the cleaning web can be reduced.

According to the fourth invention of the present application,
Since the DC motor changes the rotation frequency in accordance with the number of times of the fixing process in the continuous fixing process, the larger the number of times of the fixing process, the larger the cleaning web transport amount per a predetermined time. The transport amount of the web can be optimized, and the running cost of the cleaning web can be reduced.

Further, according to the fifth invention of the present application, the web feeding means, according to the number of fixing processes in the continuous fixing process, increases the cleaning web transport amount per predetermined time as the number of fixing processes increases. Since the cleaning web is made larger, the conveyance amount of the cleaning web can always be optimized, and the running cost of the cleaning web can be reduced.

According to the sixth aspect of the present invention,
Since the solenoid changes the operation frequency in accordance with the number of times of the fixing process in the continuous fixing process, the larger the number of times of the fixing process, the larger the cleaning web transport amount per a predetermined time. And the running cost of the cleaning web can be reduced.

Further, according to the seventh invention of the present application, the DC motor changes the rotation speed in accordance with the number of times of the fixing process in the continuous fixing process, so that the larger the number of times of the fixing process, the more the predetermined time per predetermined time. Since the cleaning web transport amount is increased, the cleaning web transport amount can always be optimized, and the running cost of the cleaning web can be reduced.

According to the eighth invention of the present application,
Since the DC motor changes the rotation frequency in accordance with the number of times of the fixing process in the continuous fixing process, the larger the number of times of the fixing process, the larger the cleaning web transport amount per a predetermined time. The transport amount of the web can be optimized, and the running cost of the cleaning web can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a schematic configuration of a fixing device provided in the image forming apparatus of FIG.

FIG. 3 is a flowchart for explaining operation control of a web feeding unit provided in the fixing device of FIG. 2;

FIG. 4 is a diagram illustrating a life of a cleaning web according to the embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a schematic configuration of a cleaning web in a conventional fixing device.

[Explanation of symbols]

 Reference Signs List 10 fixing device (fixing device) 10a fixing roller (fixing member) 10b pressure roller (pressing member) 37, 38 halogen heater (heating means) 41 cleaning web 46 web feeding solenoid (web feeding means) P recording material (recording medium) )

Claims (8)

[Claims] An image forming apparatus comprising: a fixing member and a pressure member that rotate in pressure contact with each other; and a heating unit that heats the fixing member, wherein a recording medium carrying an unfixed image is nipped and conveyed by the fixing member and the pressure member. A fixing device for recording the unfixed image on the recording medium by heating and pressurizing, wherein the fixing device is disposed in contact with or in pressure contact with a fixing member, and the surface of the fixing member is cleaned by rubbing with the fixing member. A fixing device comprising: a cleaning web to be cleaned; and a web feeding means for conveying the cleaning web in a predetermined direction. In the fixing device, the web feeding means determines a predetermined time as the number of times of the fixing process increases in accordance with the number of times of the fixing process in the continuous fixing process. A fixing device characterized in that a cleaning web conveyance amount per contact is set large. 2. The web feeding means is a solenoid,
2. The fixing device according to claim 1, wherein the cleaning web conveyance amount can be set by changing an operation frequency of the solenoid. 3. The web feed means is a DC motor,
2. The fixing device according to claim 1, wherein the cleaning web transport amount can be set by changing a rotation speed of the DC motor. 4. The web feed means is a DC motor,
The fixing device according to claim 1, wherein the cleaning web transport amount can be set by changing a rotation frequency of the DC motor. 5. An image forming apparatus for recording an image formed by a series of image forming processes, wherein the image forming apparatus comprises the fixing device according to claim 1. 6. The web feeding means is a solenoid,
6. The image forming apparatus according to claim 5, wherein a cleaning web transport amount can be set by changing an operation frequency of the solenoid. 7. The web feeding means is a DC motor,
The image forming apparatus according to claim 5, wherein the cleaning web transport amount can be set by changing a rotation speed of the DC motor. 8. The web feeding means is a DC motor,
6. The image forming apparatus according to claim 5, wherein the cleaning web transport amount can be set by changing a rotation frequency of the DC motor.