JP2012181402A - Fixing device and image forming apparatus - Google Patents

Abstract

A fixing belt and a pressure belt each form a nip portion that heats and presses the recording paper by a support pressing member provided inside the belt to reduce power consumption, shorten warm-up time and first print time, and apparatus Downsizing.
A fixing device that fixes a toner image on a recording medium S to the recording medium S includes an image surface side fixing belt 51 that sandwiches and conveys the recording medium S, and a non-image surface side pressure belt 52; Each of these belts includes support pressing members 54 and 56 that do not rotate in the belt, thereby forming a nip portion that heats and presses the recording medium S. Separately from the support pressing members 54 and 56, the fixing belt 51 or A rotation member 57 is provided on either inner side of the pressure belt 52 to apply a rotational driving force to either the fixing belt 51 or the pressure belt 52, thereby reducing the heat capacity of the entire apparatus and reducing the size of the apparatus. Achieve.
[Selection] Figure 3

Description

  The present invention relates to a fixing device installed in an image forming apparatus such as a copying machine, a printer, a facsimile, or a multifunction machine of these, and an image forming apparatus including the fixing device.

Conventionally, the following fixing devices are known to be installed in an image forming apparatus.
(1) Types of fixing belt (multi-axis) and pressure roller Conventionally, in image forming apparatuses such as copying machines and printers, a technique using a fixing belt stretched around a plurality of roller members as a fixing member is known. (For example, refer to Patent Document 1). An apparatus using such a fixing belt is provided in a fixing belt (endless belt) as a fixing member, a plurality of roller members that stretch and support the fixing belt, and one of the plurality of roller members. And a heater, a pressure roller (pressure member), and the like. The heater heats the fixing belt via the roller member. The toner image on the recording medium conveyed toward the nip formed between the fixing belt and the pressure roller is fixed on the recording medium by receiving heat and pressure at the nip.
(2) Types of Fixing Belt (Single Axis) and Pressure Roller On the other hand, Patent Document 2 and the like disclose an on-demand fixing device with a short warm-up time. An on-demand fixing device includes a fixing film (endless film) as a fixing member, a pressure roller (pressure member), a heater such as a ceramic heater, and the like. The heater is installed inside the fixing film, contacts the pressure roller through the fixing film to form a nip portion, and heats the fixing film. The toner image on the recording medium conveyed toward the nip portion is fixed on the recording medium by receiving heat and pressure at the nip portion. Patent Document 5 and the like disclose a fixing device that uses a fixing belt (endless belt) in which a heating unit (heating element) is provided as a belt member and a pressure roller as a rotating body. Specifically, a belt guide member as a fixing member is fixed so as to be in sliding contact with the inner peripheral surface of the fixing belt. As a result, the belt guide member is pressed against the pressure roller via the fixing belt to form a nip portion. The toner image on the recording medium conveyed toward the nip portion is fixed on the recording medium by receiving heat and pressure at the nip portion.
(3) Type of fixing roller and pressure belt (multiaxial) In Patent Document 3, etc., a pressure belt (endless belt) is used as a belt member, and a heating means (halogen lamp) is provided as a rotating body. A fixing device using a roller (heat fixing roll) is disclosed. Specifically, a pressure pad (pressure pad) as a fixing member is fixed so as to be in sliding contact with the inner peripheral surface of the pressure belt while being biased toward the nip portion by a spring. As a result, the pressure pad is pressed against the fixing roller via the pressure belt to form a nip portion. The toner image on the recording medium conveyed toward the nip portion is fixed on the recording medium by receiving heat and pressure at the nip portion.
(4) Types of Fixing Roller and Pressure Belt (Pad) In Patent Document 4 and the like, a pressure roller (endless belt) is used as a belt member, and a heating roller (halogen lamp) is provided as a rotating body. A fixing device using a (heat fixing roll) is disclosed. Specifically, a pressure pad (pressing pad) as a fixing member is fixed so as to be in sliding contact with the inner peripheral surface of the pressure belt. As a result, the pressure pad is pressed against the fixing roller via the pressure belt to form a nip portion. The toner image on the recording medium conveyed toward the nip portion is fixed on the recording medium by receiving heat and pressure at the nip portion.
(5) Types of Fixing Roller and Pressure Pad In Patent Document 6 and the like, a pad is directly used as a pressure member. Although effective for downsizing and low heat capacity, there is a problem in the sliding property of the recording medium and the pad, and the recording medium is likely to be jammed.

  Since the fixing device described in Patent Document 1 and the like described above uses a heating roller that heats the belt at a portion unrelated to nip formation, as compared with a fixing device found in a black and white machine using a thick fixing roller. Although it is possible to reduce the thickness of the roller, which is suitable for speeding up the device, the warm-up time (the time required to reach a printable temperature) and the first print time (the time required for reaching the printable temperature) There is a limit to shortening the time required to complete a print operation after receiving a print request and completing a print operation.

  On the other hand, the fixing device of Patent Document 2 and the like can shorten the warm-up time and the first print time by reducing the heat capacity by uniaxially fixing the components in the fixing belt, and can also reduce the size of the device. Become. However, since the heat capacity of the pressure roller is particularly large, there is a limit to shortening the warm-up time and the first print time.

  As another problem, in such a fixing device, only the nip portion of the fixing film is locally heated, and other portions of the fixing film are not sufficiently heated. For this reason, there is a problem that the fixing film is most cooled on the inlet side of the nip portion due to the rotation of the fixing film, and the fixing defect is likely to occur. Such a problem has not been particularly negligible because when the speed of the apparatus is increased, the rotation of the fixing film becomes faster and the heat radiation of the fixing film at positions other than the nip portion increases.

  In the fixing device of Patent Document 3 or the like, since the fixing roller having a heating source directly forms a nip, it is difficult to reduce the heat capacity because the roller is thickened, and the pressure belt is provided with a multi-axis inside. Therefore, it is difficult to reduce the heat capacity and downsize the apparatus.

  In the fixing device disclosed in Patent Document 4 or the like, it is difficult to reduce the heat capacity because the fixing roller having a heating source directly forms a nip, so that the roller is thickened.

  The object of the present invention is to reduce the power consumption, the warm-up time and the first print time, and the size of the apparatus by reducing the heat capacity of the fixing device.

  According to a first aspect of the present invention, there is provided a fixing device for fixing a toner image on a recording paper onto the recording paper, wherein an image surface side fixing belt and a non-image surface side pressure belt conveyed with the recording paper interposed therebetween. And the fixing belt and the pressure belt each form a nip portion that heats and presses the recording paper by a support pressing member provided inside the belt.

  According to the second aspect of the present invention, there is provided a fixing belt on the image side and a pressure belt on the non-image side that are conveyed with the recording paper sandwiched therebetween, and the fixing belt and the pressure belt are respectively provided inside the belt. In a fixing device in which a nip portion for heating and pressing the recording paper is formed by a support pressing member, the pressure belt is rotated by applying a rotational driving force to the fixing belt on the image surface side and sandwiched between the nip portions. The recording paper is conveyed.

  According to the third aspect of the present invention, there is provided a fixing belt on the image side and a pressure belt on the non-image side that are conveyed with the recording paper interposed therebetween, and the fixing belt and the pressure belt are provided inside the belt, respectively. A nip portion that heats and presses the recording paper is formed by the support pressing member, and the pressure belt is rotated by applying a rotational driving force to the fixing belt on the image surface side, and the recording paper held in the nip portion is conveyed. In the fixing device, the rotation driving member of the fixing belt has a heating source, and the fixing belt is heated by the heating source.

  According to a fourth aspect of the present invention, there is provided a fixing belt on the image surface side for nipping and conveying the recording paper and a pressure belt on the non-image surface side, and the fixing belt and the pressure belt are respectively provided on the inner side of the belt. In a fixing device in which a nip portion for heating and pressing the recording paper is formed by a pressing member, the fixing belt is rotated by applying a rotational driving force to the pressure belt on the non-image surface side, and the nip portion It is characterized in that the sandwiched recording paper is conveyed.

  According to the fifth aspect of the present invention, there is provided a fixing belt on the image surface side for nipping and conveying the recording paper and a pressure belt on the non-image surface side, and the fixing belt and the pressure belt are each provided on the inner side of the belt. A nip portion that heats and presses the recording paper is formed by a pressing member, and the fixing belt is rotated by applying a rotational driving force to the pressure belt on the non-image surface side, and the recording paper that is nipped in the nip portion is conveyed. In the apparatus, the heating source of the fixing belt is a halogen heater that directly heats the fixing belt.

  According to the sixth aspect of the present invention, there is provided an image surface side fixing belt and a non-image surface side pressure belt that are conveyed with the recording paper interposed therebetween, and the fixing belt and the pressure belt are respectively provided inside the belt. A nip portion that heats and presses the recording paper is formed by a support pressing member, and a rotation driving force is applied to the pressure belt on the non-image surface side to rotate the fixing belt and convey the recording paper held in the nip portion. In the fixing device, the fixing belt is heated by a sleeve having a halogen heater therein.

  According to the seventh aspect of the present invention, there is provided an image surface side fixing belt and a non-image surface side pressure belt which are conveyed with the recording paper interposed therebetween, and the fixing belt and the pressure belt are respectively provided inside the belt. A nip portion that heats and presses the recording paper is formed by a support pressing member, and a rotation driving force is applied to the pressure belt on the non-image surface side to rotate the fixing belt and convey the recording paper held in the nip portion. In the fixing device, the rotation driving member of the pressure belt has a heating source, and the pressure belt is heated by the heating source.

  An apparatus according to claim 8 includes an image forming unit and a fixing device according to any one of claims 1 to 7 that fixes the toner image formed on the recording medium by the image forming unit to the recording medium. An image forming apparatus characterized by the above.

  According to the present invention, since the recording paper is heated and pressed by the support pressing member from the respective sides of the fixing belt on the image surface side and the pressure belt on the non-image surface side which are conveyed while sandwiching the recording paper, the nip portion is formed. Reduced power consumption, shortened warm-up time and first print time, and reduced device size.

1 is a schematic configuration diagram of a printer that is an example of an image forming apparatus that is an object of the present invention. Diagram showing schematic configuration of fixing device The figure which shows the structure which provides rotational driving force to the fixing belt side Sectional drawing which shows Example 2 of this invention Sectional drawing which shows Example 3 of this invention Sectional drawing which shows Example 4 of this invention

  By forming a nip portion that heats and presses the recording paper by a support pressing member provided inside each of the fixing belt on the image surface side and the pressure belt on the non-image surface side that conveys the recording paper with the above-described object interposed therebetween, It has reduced power consumption, shortened warm-up time and first print time, and reduced device size.

  For example, the pressure belt can be rotated by applying a rotational driving force to the fixing belt on the image surface side, and the recording paper held between the nip portions can be conveyed. Also. The fixing belt rotation driving member may have a heating source to heat the fixing belt. Furthermore, by applying a rotational driving force to the pressure belt on the non-image surface side, the fixing belt can be rotated and the recording paper sandwiched between the nip portions can be conveyed.

  In addition, for example, by using a halogen heater that directly heats the fixing belt as the heating source of the fixing belt, the power consumption is reduced by reducing the heat capacity of the device, the warm-up time and first print time are shortened, the device is downsized, and the thermal efficiency Can be raised. The fixing belt can be heated by a sleeve having a halogen heater inside to stabilize the temperature of the fixing belt. Furthermore, the warming-up time and the first print time can be further shortened by heating the pressure belt with a heating source in the rotation driving member of the pressure belt.

<Example 1>
Hereinafter, an embodiment in which the present invention is applied to a color laser printer (hereinafter simply referred to as “printer”) as an image forming apparatus will be described. FIG. 1 is a schematic configuration diagram of a printer which is an example of an image forming apparatus that is an object of the present invention. In this printer, four image forming units of yellow, cyan, magenta, and black are arranged side by side to constitute a tandem image forming unit. In the tandem image forming unit, image forming units 101Y, 101C, 101M, and 101K, which are individual toner image forming units, are arranged in order from the left in the figure. Here, the suffixes Y, C, M, and K of the respective symbols indicate members for yellow, magenta, cyan, and black, respectively. In the tandem image forming unit, the individual image forming units 101Y, 101C, M, and K are arranged around the drum-shaped photoreceptors 21Y, 21C, 21M, and 21K as latent image carriers, and the charging device and the developing device 10Y. 10C, 10M, 10K, photoconductor cleaning device and the like. At the top of the printer, toner bottles 2Y, 2C, 2M, and 2K filled with yellow, cyan, magenta, and black color toners are arranged. Each color developing device 10Y, 10C, 10M, and 10K is replenished by a predetermined replenishment amount from the toner bottles 2Y, 2C, 2M, and 2K through a conveyance path (not shown). Hereinafter, when it is not necessary to specify the toner color, description of Y, C, M, and K is omitted as in the image forming unit 101, the photosensitive member 21, and the like.

  An optical writing unit 9 as a latent image forming unit is provided below the tandem image forming unit. The optical writing unit 9 includes a light source, a polygon mirror, an f-θ lens, a reflection mirror, and the like, and is configured to irradiate the surface of each photoconductor 21 with laser light based on image data. . Further, an intermediate transfer belt 1 in the form of an endless belt is provided as an intermediate transfer member immediately above the tandem image forming unit. The intermediate transfer belt 1 is wound around support rollers 1a and 1b, and a drive motor (not shown) serving as a drive source is connected to a rotation shaft of the drive roller 1a among the support rollers. When this drive motor is driven, the intermediate transfer belt 1 rotates counterclockwise in the figure and the followable support roller 1b rotates. Inside the intermediate transfer belt 1, primary transfer devices 11Y, 11C, 11M, and 11K for transferring the toner image formed on the photoreceptor 21 onto the intermediate transfer belt 1 are provided.

  A secondary transfer roller 4 as a secondary transfer device is provided downstream of the primary transfer device 11 in the driving direction of the intermediate transfer belt 1. A support roller 1b is disposed on the opposite side of the secondary transfer roller 4 and the intermediate transfer belt 1 and functions as a pressing member. Further, a paper feed cassette 8, a paper feed roller 7, a registration roller 6 and the like are provided. Further, a fixing device 5 for fixing an image on the recording medium S and a paper discharge roller 3 are provided downstream of the secondary transfer roller 4 with respect to the traveling direction of the recording medium S to which the toner image is transferred by the secondary transfer roller 4. I have.

  Next, the operation of the printer described above will be described. The photosensitive member 21 is rotated by individual image forming means, and with the rotation of the photosensitive member 21, the surface of the photosensitive member 21 is first uniformly charged by the charging devices 17Y, 17C, 17M, and 17K. Next, the image data is irradiated with writing light by a laser from the optical writing unit 9 to form an electrostatic latent image on the photosensitive member 21. Thereafter, toner is attached by the developing device 10 to visualize the electrostatic latent image, thereby forming yellow, cyan, magenta, and black single-color images on the respective photoreceptors 21. Further, the driving roller 1a is rotationally driven by a driving motor (not shown), the other driven roller 1b and the secondary transfer roller 4 are driven to rotate, the intermediate transfer belt 1 is rotated and conveyed, and the visible image is transferred to the primary transfer device. 11, the images are sequentially transferred onto the intermediate transfer belt 1. As a result, a composite color image is formed on the intermediate transfer belt 1. The surface of the photoconductors 21Y, 21C, 21M, and 21K after image transfer is cleaned by removing residual toner with a photoconductor cleaning device to prepare for image formation again.

  In accordance with the timing of image formation, the leading edge of the recording medium S is fed from the paper feed cassette 8 by the paper feed roller 7 and conveyed to the registration roller 6 and temporarily stops. Then, the sheet is conveyed between the secondary transfer roller 4 and the intermediate transfer belt 1 while taking timing with the image forming operation. Here, the intermediate transfer belt 1 and the secondary transfer roller 4 form a so-called secondary transfer nip across the recording medium S, and the secondary transfer roller 4 transfers the toner image on the intermediate transfer belt 1 onto the recording medium S. Secondary transfer to.

  The recording medium S after image transfer is sent to the fixing device 5, has a heating source 53, and faces the fixing belt 51 and the fixing belt 51 as a fixing member whose surface is maintained at a predetermined temperature by the temperature control means 55. The sheet is nipped and conveyed to a nip formed by a pressure belt 52 that is a pressure member pressed against the fixing belt 51 to heat and press the toner image on the sheet and fix it on the sheet. Further, the sheet discharged from the nip portion is discharged from the discharge roller 3 to the outside of the apparatus. On the other hand, the intermediate transfer belt 1 after the image transfer is removed by the intermediate transfer body cleaning device 12 to remove residual toner remaining on the intermediate transfer belt 1 after the image transfer, so that the tandem image forming unit prepares for another image formation.

  FIG. 2 shows a schematic configuration of the fixing device 5. A fixing belt 51 is provided as a fixing member on the image surface side, and a pressure belt is provided as a pressure member on the non-image surface side. A fixing support member 54 is provided inside the fixing belt 51, and a pressure pressing member 56 is provided inside the pressure belt 52. The fixing support member 54 and the pressure pressing member 56 face each other and are pressed through the fixing belt 51 and the pressure belt 52 so that the recording medium S is nipped and conveyed, and the toner image is heated and pressed to fix it on the recording medium S. Forming part. With this configuration, it is not necessary to use a pressure roller having a thick elastic layer, and a belt configuration with a small heat capacity can be achieved on both the image surface side and the non-image surface side. Further, the belt can be reduced in diameter, and the heat capacity of the entire fixing device can be reduced. As a result, reduction in power consumption, shortening of warm-up time and first print time, miniaturization of the apparatus, and the like can be achieved.

The configuration of the fixing belt 51 will be described.
A fixing belt 51 as a fixing member is a thin and flexible endless belt, and rotates counterclockwise in FIG. In the fixing belt 51, an elastic layer and a release layer are sequentially laminated on a base material, and the entire thickness is generally set to 1 mm or less. The base material of the fixing belt 51 has a layer thickness of 30 to 50 μm and is formed of a metal material such as nickel or stainless steel or a resin material such as polyimide. The elastic layer of the fixing belt 51 has a layer thickness of 100 to 300 μm and is formed of a rubber material such as silicone rubber, foamable silicone rubber, or fluororubber. By providing the elastic layer, minute irregularities on the surface of the fixing belt 51 in the nip portion are not formed, and heat is uniformly transmitted to the toner image on the recording medium S, thereby suppressing the generation of a crushed skin image. The release layer of the fixing belt 51 has a layer thickness of 10 to 50 μm, such as PFA (tetrafluoroethylene bar fluoroalkyl vinyl ether copolymer resin), polyimide, polyetherimide, PES (polyether sulfide), and the like. Made of material. By providing the release layer, the releasability (peelability) for the toner image is secured.

The configuration of the pressure belt 52 will be described.
Although the material configuration is the same as that of the fixing belt 51, the elastic layer of the fixing belt 51, which is an object for improving the image quality, is often omitted because it is disposed on the non-image surface.

The configurations of the fixing support member 54 and the pressure pressing member 56 will be described.
A metal material is used as a base material for obtaining rigidity. The material is arbitrary according to needs such as strength, workability, and cost. Next to the substrate, an elastic layer is provided as necessary. The surface layer is made of a material having a low coefficient of friction, for example, a fluorine-based material such as PFA or PTFE, so that the wear is reduced even if the contact portion and the fixing belt 51 (pressure belt 52) are in sliding contact. It is preferable to form. The shape of the nip portion is arbitrarily determined in consideration of the direction of entry and discharge of the recording medium S, the adhesion between the paper and the belt in the nip, the sliding resistance, and the like. Considering overall performance, a flat shape is often advantageous. In forming the nip, the fixing support member 54 and the pressure pressing member 56 are generally pressed by an elastic member such as a spring. In the case of the present invention, since the sliding resistance is large, the elastic force is set as small as possible, or the gap between the fixing support member 54 and the pressure pressing member 56 can be adjusted, or the elastic member and the gap adjustment are combined. The configuration of can be considered.

  FIG. 3 shows a configuration for applying a rotational driving force to the fixing belt 51 side. A fixing driving roller 57 is provided inside the fixing belt 51, and tension is applied to the fixing belt 51 by an elastic member such as a spring (not shown). By rotating the fixing driving roller 57, the driving force is transmitted to the fixing belt 51 by the frictional force between the inner peripheral surface of the fixing belt 51 and the outer peripheral surface of the fixing driving roller 57, and the fixing belt 51 rotates. As the fixing belt 51 rotates, the pressure belt 52 in contact with the nip portion is also rotated. Similarly, when the recording medium S is conveyed to the nip portion, the driving force is transmitted and the recording medium S is conveyed. As shown in FIG. 3, in this case, the pressure belt 52 only needs to be large enough to provide the pressure pressing member 56 on the inside, and the diameter of the pressure belt 52 can be reduced. As a result, the heat capacity can be reduced. Reduction of power consumption, shortening of warm-up time and first print time, and downsizing of the apparatus can be achieved.

  Further, as shown in FIG. 3, the fixing belt 51 can be heated by forming the fixing driving roller 57 with a metal tube and providing the heating source 53 inside the fixing driving roller 57. The fixing driving roller 57 needs a force to apply tension to the fixing belt 51, but does not apply a pressing force as large as the fixing nip formation. For this reason, the fixing drive roller 57 can be thinned, and as a result, the heat capacity can be reduced, leading to reduction in power consumption, shortening of warm-up time and first print time.

<Example 2>
FIG. 4 shows a configuration in which a rotational driving force is applied to the pressure belt 52 side. A pressure driving roller 58 is provided inside the pressure belt 52, and tension is applied to the pressure belt 52 by an elastic member such as a spring (not shown). By rotating the pressure driving roller 58, the driving force is transmitted to the pressure belt 52 by the frictional force between the inner peripheral surface of the pressure belt 52 and the outer peripheral surface of the pressure driving roller 58, and the pressure belt 52 rotates. As the pressure belt 52 rotates, the fixing belt 51 in contact with the nip portion is also rotated. Similarly, when the recording paper is conveyed to the nip portion, the driving force is transmitted and the recording paper is conveyed. In order to reduce the heat capacity of the fixing device, it is preferable that the pressure driving roller 58 has a heat capacity as low as possible as long as the function of rotating the pressure belt 52 can be achieved.

  A method for heating the fixing belt 51 in this embodiment will be described. Consider a case where a heating source 53 is provided inside the fixing belt 51 to heat the fixing belt 51 directly. Since the fixing belt 51 can be directly heated without using an intermediate medium, it is most efficient and leads to reduction of power consumption, shortening of warm-up time and first print time. As an example of the heating source 53, a halogen heater is generally used. By using a halogen heater, an effect of reducing the component cost can be obtained.

  In the case of the direct heating method, it is conceivable that the fixing belt 51 is too low in heat capacity and it becomes difficult to control the temperature. In such a case, the temperature ripple may increase with respect to the target temperature, resulting in image defects such as hot offset and cold offset.

<Example 3>
Consider giving priority to temperature stability and providing a sleeve 59 between the fixing belt 51 and the heating source 53 as shown in FIG. A metal material is generally used for the sleeve 59, and the temperature gradient is reduced and temperature control is facilitated by transferring heat from the heating source 53 directly to the fixing belt 51 due to the heat capacity and heat storage effect of the sleeve 59. However, if the heat capacity of the sleeve 59 is too large, the power consumption will be reduced and the effect on the warm-up time and first print time will increase, thus reducing the energy saving effect. Therefore, it has an appropriate heat capacity that can achieve both stable temperature control and low heat capacity. It is necessary to set the sleeve 59.

  A configuration in which the heating source 53 is used inside the fixing driving roller 57 in the example of FIG. 3 is also possible. In this case, the fixing driving roller 57 functions as a heat medium of the heating source 53 and does not use a function as a driving source.

<Example 4>
As in the embodiment shown in FIG. 6, the heating source 53 can be provided inside the pressure driving roller 58. Since it is possible to heat both the front and back sides of the recording paper, the warm-up time can be shortened. On the other hand, since two heating sources are required, it cannot necessarily save energy, but it is effective when the top priority is to shorten the warm-up time.

1: Intermediate transfer belt 1a, 1b: Support rollers 2Y, 2C, 2M, 2K: Toner bottle 3: Paper discharge roller 4: Secondary transfer roller 5: Fixing device 6: Registration roller 7: Paper feed roller 8: Paper feed cassette 9: Optical writing units 10Y, 10C, 10M, 10K: Developing devices 11Y, 11C, 11M, 11K: Primary transfer device 12: Intermediate transfer member cleaning devices 17Y, 17C, 17M, 17K: Charging devices 21Y, 21C, 21M, 21K: photoconductor 51: fixing belt 51a: opening 52: pressure belt 53: heating source 54: fixing support member 55: temperature control means 56: pressure pressing member 57: fixing driving roller 58: pressure driving roller 59: Sleeve 101Y, 101C, 101M, 101K: Image forming means S: Recording medium

Japanese Patent Laid-Open No. 11-2982 Japanese Patent No. 2884714 Japanese Patent No. 3298354 JP-A-10-213984 JP 7-287461 A JP 2009-237350 A

Claims (8)

In a fixing device for fixing a toner image on a recording paper to the recording paper,
It has a fixing belt on the image side and a pressure belt on the non-image side that conveys the recording paper.
Each of the fixing belt and the pressure belt forms a nip portion that heats and presses the recording paper by a support pressing member provided inside the belt.
A fixing device. A fixing belt on the image surface side and a pressure belt on the non-image surface side conveyed with the recording paper sandwiched therebetween, and the fixing belt and the pressure belt each heat the recording paper by a support pressing member provided inside the belt. In the fixing device forming the nip portion to be pressed,
While rotating the pressure belt by applying a rotational driving force to the fixing belt on the image side,
Conveys recording paper sandwiched between nips,
A fixing device. A fixing belt on the image surface side and a pressure belt on the non-image surface side conveyed with the recording paper sandwiched therebetween, and the fixing belt and the pressure belt each heat the recording paper by a support pressing member provided inside the belt. In the fixing device that forms a nip portion to be pressed, rotates the pressure belt by applying a rotational driving force to the fixing belt on the image surface side, and conveys the recording paper sandwiched between the nip portions.
A heating source for the rotation driving member of the fixing belt;
Heating the fixing belt by the heating source;
A fixing device. It has a fixing belt on the image surface side for nipping and conveying the recording paper, and a pressure belt on the non-image surface side, and the fixing belt and the pressure belt are heated and pressed against the recording paper by a support pressing member provided inside the belt, respectively. In the fixing device forming the nip portion to be
While rotating the fixing belt by applying a rotational driving force to the pressure belt on the non-image surface side,
Transport the recording paper sandwiched between the nips,
A fixing device. It has a fixing belt on the image surface side for nipping and conveying the recording paper, and a pressure belt on the non-image surface side, and the fixing belt and the pressure belt are heated and pressed against the recording paper by a support pressing member provided inside the belt, respectively. A fixing device that forms a nip portion that rotates and rotates the fixing belt by applying a rotational driving force to the pressure belt on the non-image surface side and conveys the recording paper sandwiched between the nip portions.
The heating source of the fixing belt is a halogen heater that directly heats the fixing belt.
A fixing device. A fixing belt on the image surface side and a pressure belt on the non-image surface side conveyed with the recording paper sandwiched therebetween, and the fixing belt and the pressure belt each heat the recording paper by a support pressing member provided inside the belt. In the fixing device that forms a nip portion to be pressed and rotates the fixing belt by applying a rotational driving force to the pressure belt on the non-image surface side and conveys the recording paper sandwiched between the nip portions.
The fixing belt is heated by a sleeve having a halogen heater inside.
A fixing device. A fixing belt on the image surface side and a pressure belt on the non-image surface side conveyed with the recording paper sandwiched therebetween, and the fixing belt and the pressure belt each heat the recording paper by a support pressing member provided inside the belt. In the fixing device that forms a nip portion to be pressed and rotates the fixing belt by applying a rotational driving force to the pressure belt on the non-image surface side and conveys the recording paper sandwiched between the nip portions.
Having a heating source in the rotation driving member of the pressure belt;
Heating the pressure belt by the heating source;
A fixing device. An image forming apparatus comprising: an image forming unit; and a fixing device according to claim 1 for fixing a toner image formed on the recording medium by the image forming unit to the recording medium.