JP2003233266A - Fixing device and image forming apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus having a fixing device which eliminates the need for a coating agent, a separation claw, etc., has excellent durability, and securely prevents wrapping of a sheet material and degradation in fixability, thereby forming a high quality image. <P>SOLUTION: The device has: a thermal fixing movable means 1 which is supported rotatably and generates heat; a pressure movable means 2 which is held rotatably and presses the thermal fixing means 1 in order to form a fixing nip (N); and an attractable peeling means 3 which attracts and peels the sheet (S) separated from the pressure movable means 2 and the thermal fixing movable means 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device, and
More specifically, the present invention relates to an image forming apparatus including the fixing device, and more specifically, a fixing device that heats and fixes a heated object on a sheet material to be conveyed, and a toner image formed using an electrophotographic method on a sheet of the transferred object. The present invention relates to an image forming apparatus provided with a fixing device such as a copying machine, a printer, a facsimile machine or a composite machine of these, which forms an image by fixing after transferring onto a material.

[0002]

2. Description of the Related Art Conventional electrophotographic copying machines, printers,
In a fixing device used in an image forming apparatus such as a facsimile machine, a photoconductor of an image carrier is irradiated with laser light to draw an electrostatic latent image, which is transferred as a toner image to a sheet material of a transfer target by a developing unit. Then, the sheet is heated while being pressed by a pressure roller or a belt constituting a fixing device to melt the toner to form an image. In FIG. 10, the fixing device 100 includes a sheet material (S) of a recording medium carrying a toner image of a toner (t) of an object to be heated, which is an unfixed image, between a fixing roller 101 and a conveying roller 102. Through the endless fixing belt 103 for heat fixing, which is stretched and stretched,
The unfixed image is heated and fixed on the sheet material (S) of the recording medium by heating and pressing the toner (t) at the fixing nip portion (N) between the fixing roller 101 and the pressure roller 104 to heat and fuse the toner (t). Here, the fixing roller 101 has a cored bar 101a at the center, and is made of a soft and heat-resistant material such as foamed silicone rubber in order to make the fixing nip (N) width sufficiently wide on the outer periphery thereof. Adiabatic elastic member 1 constructed
It has 0b. The fixing belt 103 for heat fixing is
For example, it is composed of two layers, a base body (not shown) and a surface layer (not shown) coated on the base body. As the base body (not shown), a thin endless endless member made of nickel, polyimide of heat-resistant resin, carbon steel, stainless steel, or the like is used. A belt-like belt is used, and as the surface layer (not shown), a heat-resistant release layer such as a fluorine resin or silicon rubber is used. Pressure roller 1
The configuration of 04 is a two-layer configuration in which a surface layer 104b of a cored bar 104a made of aluminum, stainless steel, carbon steel or the like has a heat-resistant release layer such as a fluorine resin or silicon rubber. Here, the core metal 104a is configured to be hollow,
In some cases, a halogen heater or the like (not shown) as a heat source may be included therein. The transport roller 102 is, for example, a hollow metal cylinder thin-walled roller made of aluminum, carbon steel, stainless steel, or the like. Further, the heating means 10 is provided in the conveying roller 102.
It is equipped with a 2a halogen heater and the like. Originally, such a heating type fixing device 100 using the fixing belt 103 for heat fixing has a short rise time, has an effect of preventing toner (t) belt offset, and is oilless or a small amount of oil is applied. Is possible and resource saving. A fixing device is also known in which the hardness of the elastic body of the pressure roller is set to be higher than the hardness of the elastic body of the heat fixing roller by 20 to 30 degrees on the JIS-A hardness scale (JP-A-200).
0-338811 etc.). As a result, the fixing nip portion has a convex shape, and the peeling angle of the transfer material from the heat fixing roller can be increased, so that the separation performance is improved. However, under the condition that a large amount of toner adheres due to the overlapping of the toners of the respective colors, it is difficult to surely separate due to the effect of the shape of the fixing nip portion. In particular, under severe conditions of oillessness and high linear velocity, it is difficult to separate the transfer material without a separating means such as a separating claw that abuts the fixing roller.

It is also known that a fixing separation claw for separating a recording medium is arranged in non-contact with the surface of the fixing roller (see Japanese Patent Laid-Open No. 8-166738). Since the fixing roller and the pressure roller have the same structure, the shape of the fixing nip portion is flat and the peeling angle with respect to the fixing roller is small. Therefore, it is necessary to accurately adjust the distance between the separating claw and the fixing roller. or,
Since a mechanism for adjusting the interval is required, the number of parts of the separating claw increases, which increases the cost. Further, even in such a method, it is difficult to secure the separation performance corresponding to each paper type without applying oil. The fixing fixing member for fixing which forms a fixing nip portion by pressure contact with the fixing roller via the pressure belt to fix the fixing portion partially penetrates into the fixing roller via the belt at the fixing nip outlet separation portion. A distortion is formed, and a small slip effect between the belt and the fixing roller due to the distortion aims to improve the separability.
The belt is set freely on the pressure fixing member,
A free belt nip system having no belt tension means is also known (see JP-A-11-133776 and the like). Even with such a method, the separation performance is not sufficient, or the separation means is provided to assist the separation performance, which causes a cost increase.

Further, in a fixing device in which a film which slides with a fixed heating means is suspended around only the heating means and a driving roller, and a rubber layer is provided on the outer circumference of the driving roller, the film slides with the heating means. It is also known that the film drive load for reducing the film is reduced, and that the rubber layer on the outer periphery of the drive roller reliably drives the film and prevents the occurrence of wrinkles and uneven feeding without using a separate tension roller (special feature). Kaihei 3-
(See publications such as 166579). Even in such a method, under severe conditions such as oilless and high linear velocity, the transfer sheet is separated without a separation claw or the like in order to separate the transfer sheet at the separation portion of the pressure roller that applies pressure through the heating means and the film. Is difficult. An outer roller disposed outside the endless fixing belt and abutting on the outer peripheral portion of the endless fixing belt, and an outer roller disposed inside the endless fixing belt and pressed against the outer roller via the endless fixing belt. A belt including a heating device and an inner roller that is disposed inside the endless fixing belt and is in pressure contact with the outer roller via the endless fixing belt, and is disposed on the transfer sheet conveying direction side with respect to the heating device. In a conventional fixing device, it is also known that the pressing force of the inner roller against the outer roller is set to be larger than the pressing force of the heating device against the outer roller to reduce wear of the heating device and the fixing belt (Japanese Patent Laid-Open No. 9-292788). Etc.). Similarly, under severe conditions such as oilless and high linear velocity, in order to separate the transfer sheet at the separation portion of the inner roller and the outer roller that pressurizes through the transfer sheet, the transfer sheet is separated without a separation claw or the like. It is difficult. In a conventional fixing device and an image forming apparatus equipped with the fixing device, an unfixed toner image on a sheet of transfer material is transferred to a fixing nip by passing through a fixing nip portion formed by pressure contact between a fixing member and a pressure member. Since the toner to be heated is an adhesive agent because it is melted in the part, the transfer material is not separated from the fixing member and is wound around, so that the surface layer of the fixing member has a releasability in order to prevent so-called winding. It is made of a good material such as fluororesin. For example, in a full-color copying machine or the like of the image forming apparatus, four colors of yellow, magenta, cyan, and black are used.
It is necessary to mix the toner, which is the heated object of the color, in the molten state, and the toner that is the heated object is completely melted in the fixing nip portion in order to mix the colors sufficiently, and further wrapping of the transfer material occurs. Was.

Usually, mold releasability is secured by applying silicone oil as a mold release agent. As the separating means, a plurality of separating claws are installed in the axial direction of the fixing member so as to lightly contact the surface of the fixing member by an elastic body such as a spring. The transfer material is separated by the separation claw and is carried out along the separation guide. Separation is ensured by bringing the separation claws into contact, but the image quality has deteriorated due to wear and scratches on the fixing member, and the toner and oil scraped by the claws adhered to the transfer material as dirt. . On the other hand, in the oilless fixing, (1) dirt due to the adhesion of oil to the transfer paper is eliminated. (2) Maintenance is free because there is no oil supply. (3) The oil application member is eliminated, resulting in cost reduction. There is an advantage. However, in the case of oilless fixing, the margin was narrower and the problem was tighter compared to the oil application method, regarding the problem of winding. Further, as a problem peculiar to belt fixing, before the unfixed toner, which is a heated object, is fused and fixed on the transfer paper of the sheet material in the fixing nip portion caused by the speed fluctuation generated in the fixing nip, a small amount of toner is fixed. The image distortion of the abnormal image caused by the position shift occurred. The cause of this image disturbance is the toner position deviation due to the speed variation caused by the belt slip, the elastic deformation due to the pressure contact between the rollers, and the like. A heating type fixing device that uses a belt has a short rise time, has an effect of preventing the belt offset of the toner to be heated, and is capable of oilless or small amount application of oil, but with respect to the problem of winding Compared with coating, the margin is narrower and stricter.If you use the separating claw of the separating means or the separating guide plate, the separation will be reliable, but the fixing member will be worn or scratched, and the durability will decrease. The image quality was also deteriorated, for example, the toner and oil scraped off with the toner adhered to the transfer material as dirt. Further, a main problem of the fixing device used for high-speed color fixing and the image forming apparatus equipped with the fixing device is that the sheet material of the recording paper is wound around the fixing belt at the time of separation.

When the speed is increased, the width of the fixing nip portion capable of fixing is maintained, so that the roller diameter becomes large and it becomes difficult to separate the curvatures. Further, since the sheet material of the recording paper is conveyed along the fixing belt, the higher the linear velocity, the less the time margin for the recording paper to separate from the fixing belt, and the easier it is to wind. As described above, in the conventional heat fixing device, the surface of the heat roller or the fixing belt is subjected to a mold release process so that the toner is not offset, and the surface of the heat roller or the fixing belt is prevented from being adhered with silicone oil or the like. Is applied and used. Further, a releasing agent such as wax is dispersed in the toner resin so that the toner itself does not adhere to a heat roller, a fixing belt, or the like. However, in the heat fixing device, the surface temperature of the heat roller and the fixing belt fluctuates in accordance with the fluctuation of the usage environment, and the condition tends to be very severe. Also, various patterns can be considered as an image, and the fixing conditions are not always gentle. The most extreme of these is the case where the so-called solid images at the very end of the writing range at the leading edge of the image are continuous in the lateral direction.
Basically, heat fixing melts the toner to make it sticky and adheres it to the paper.Therefore, it naturally shows adhesiveness to the heat roller and fixing belt, and in order to prevent this,
A release agent is applied to the roller and the fixing belt, oil is applied, and a release agent such as wax is dispersed in the toner. However, in this way, when a solid image continues in the lateral direction of the leading edge part, etc., the thermal fixing of the toner and the adhesive strength to the fixing belt are left to some extent, and therefore, as it is at the time of paper passing,
It becomes easy to wind around the roller and the fixing belt. In order to prevent this further, some separation claws for peeling are provided at the part where the paper is peeled off. However, depending on how to apply these separation claws, the pressure applied, and the adhesive pressure of the toner during paper passing, this The separation claws are strongly pressed against the surface of the roller or the fixing belt to cause rubbing, which causes scratches.The scars are embossed on the image and appear as a pattern on the image. It was greatly reduced.
Therefore, in the conventional fixing device and the image forming apparatus equipped with the fixing device, the use of the separating claw or the separating guide plate of the separating means for preventing the wrapping can surely prevent the wrapping. However, it is difficult to adjust the pressure applied and the durability is deteriorated due to abrasion and scratches, and the toner and oil scraped off by the separating claw not only adheres to the sheet material of the transfer target as dirt, but also does not pass through. There is a problem that the image quality is deteriorated because the pressure of the toner when the paper is pressed is strongly pressed against the surface of the roller or the fixing belt to cause scratches and ruin the image quality.

[0007]

Therefore, the object of the present invention is to solve such a problem. That is, a fixing device that is excellent in durability without using a coating agent or a separating claw and reliably prevents the occurrence of wrapping of the sheet material and does not cause a decrease in fixing property, and a coating agent or a separating claw. An object of the present invention is to provide an image forming apparatus having a fixing device which is excellent in durability and reliably prevents occurrence of wrapping of a sheet material without using it and forms a high quality image.

[0008]

To achieve the above object, the present invention according to claim 1 is rotatably supported in a fixing device for heating and fixing an object to be heated on a sheet material to be conveyed. Heat generating fixing movable means for generating heat by heat generation, pressure movable means for rotatably holding the heat generating fixing movable means to form a fixing nip portion, and separate from the pressure movable means and the heat generating fixing movable means. The most main feature is that it is a fixing device including suction and peeling means for sucking and peeling the sheet material to be peeled off. The present invention according to claim 2 relates to claim 1
In the fixing device described in (1), the heat-fixing movable means is a fixing device including a roller-shaped heat-fixing roller as a main feature. According to a third aspect of the present invention, in the fixing device according to the first aspect, the heat-fixing movable means is a fixing device including an endless belt-shaped heat-fixing endless belt. According to a fourth aspect of the present invention, in the fixing device according to the third aspect, the heat fixing endless belt is
The main feature is that the fixing device is stretched around a conveying roller. A fifth aspect of the present invention is characterized in that, in the fixing device according to the fourth aspect, the conveying roller is a fixing device including a heating element for heating. Claim 6
According to the present invention, in the fixing device according to any one of claims 1, 2, 3, 4 or 5, the suction peeling means starts the suction in synchronization with the leading end of the sheet material conveyed to the suction port. The main feature is that there is.

The present invention according to claim 7 relates to claims 1, 2 and
In the fixing device described in 3, 4, 5 or 6, the suction port has a fixing nip portion side formed by pressurizing the heat fixing fixing movable means and the pressure movable means in the opposite directions in which the sheet material after fixing is conveyed. The main feature of the fixing device is that the fixing device is formed so as to face the back surface of the sheet material conveyed to the thin wall side of the hollow suction member that becomes thin in the direction. According to an eighth aspect of the present invention, in the fixing device according to the first, second, third, fourth, fifth, sixth or seventh aspect, the suction peeling means is configured to detect the leading end of the sheet material conveyed by the suction port moving means. The main feature of the fixing device is that when it reaches a predetermined position, the suction port is moved to a position where it approaches or contacts the sheet material to form a gap between the heat-fixing movable means and the suction port. According to a ninth aspect of the present invention, in the fixing device according to the eighth aspect, the suction port moving unit is a fixing unit including a front-back direction moving unit that moves the suction port in the front-back direction of the sheet material conveying direction. The main feature. According to a tenth aspect of the present invention, in the fixing device according to the ninth aspect, the front-rear direction moving unit includes a biasing force imparting member that imparts a biasing force that moves the suction port in the front-rear direction of the sheet material conveying direction, and A main feature of the fixing device is a moving position restricting member that restricts a position where the suction port is moved in the front-rear direction of the sheet material conveying direction.
According to the invention of claim 11, in the fixing device according to claim 7, 8, 9 or 10, the suction port moving means comprises vertical moving means for moving the suction port in the vertical direction of the sheet material conveying direction. The main feature is that it is a fixing device. According to a twelfth aspect of the present invention, in the fixing device according to the eleventh aspect, the front-rear direction moving unit includes a biasing force imparting member that imparts a biasing force that moves the suction port in the vertical direction of the sheet material conveyance direction, and The main feature of the fixing device is a moving position regulating member that regulates the position of moving the suction port in the vertical direction of the sheet material conveyance direction.

The present invention according to claim 13 relates to claims 1, 2 and
In the fixing device described in 3, 4, 5 or 6, the main feature is that the suction and peeling means is a fixing device in which a predetermined gap between the heat fixing fixing movable means and the suction port is fixed. According to a fourteenth aspect of the present invention, in the fixing device according to the thirteenth aspect, the fixing device is characterized in that the fixed gap between the heat fixing fixing movable means and the suction port is 1 mm to 5 mm. The present invention according to claim 15 relates to claim 1
13. In the fixing device according to any one of 1 to 12, after the suction peeling means, the suction port is moved in accordance with the conveying direction and speed of the sheet material to be conveyed, and the sheet material is sucked and peeled off. The main feature is a fixing device that stops the movement and suction of the suction port. According to a sixteenth aspect of the present invention, in the fixing device according to any one of the first to fifteenth aspects, the fixing device includes a heat fixing fixing movable unit and a separation claw that separates the sheet material from the pressure movable unit. Is the main feature. According to a seventeenth aspect of the present invention, in the fixing device according to any one of the first to sixteenth aspects, the suction and peeling means sucks and pulls a sheet material separated from the heat fixing fixing movable means and the pressure movable means. The main feature is that the suction port for peeling is a fixing device including a slit-shaped suction port of a slit-shaped portion. The present invention according to claim 18 is the fixing device according to any one of claims 1 to 16, wherein the suction and peeling means sucks and pulls a sheet material separated from the heat fixing fixing movable means and the pressure movable means. The main feature is that the suction port for peeling is a fixing device including a porous suction port of a porous shape portion. According to a nineteenth aspect of the present invention, in the fixing device according to any one of the first to eighteenth aspects, the suction and peeling means sucks and pulls a sheet material separated from the heat fixing fixing movable means and the pressure movable means. A main feature of the fixing device is an opening / closing unit that opens and closes while keeping a negative pressure in the suction port to be peeled off. The present invention of claim 20 is the fixing device according to claim 19, wherein the opening / closing means is a thin-walled thick-plate opening / closing plate that slides on the suction port, and a drive for slidingly driving the thin-wall thick-plate opening / closing plate. The main feature is that it is a fixing device composed of parts. According to a twenty-first aspect of the present invention, in an image forming apparatus for forming an image by transferring a toner image formed by using an electrophotographic method to a sheet material of a transfer target and then fixing the image, the image bearing is rotatably held. Body, charging means for charging the image carrier, latent image forming means for forming an electrostatic latent image on the image carrier charged by the charging means, and electrostatic latent image formed by the latent image forming means. Developing means for developing a latent image by attaching toner to the latent image, transfer means for transferring the toner image visualized by the developing means onto a sheet material, and the transfer means for forming the toner image on the sheet material (S). The most main feature is that the image forming apparatus comprises the fixing device according to any one of claims 1 to 20 for fixing a toner image.

[0011]

According to the first aspect of the present invention, there is provided a fixing device having the above-described structure and an image forming apparatus including the fixing device.
The heat-fixing movable means that is rotatably supported and generates heat is pressed to form a fixing nip portion. The pressure-movable means that is held rotatably and the sheet material that is separated from the heat-fixing movable means are sucked and peeled off. A fixing device for heating and fixing an object to be heated on a sheet material that is sucked, peeled off, and conveyed. According to a second aspect of the present invention, the heat-fixing movable means comprises a roller-shaped heat-fixing roller, and provides a fixing device for heating and fixing an object to be heated on the conveyed sheet material. According to a third aspect of the present invention, the heat-fixing movable means comprises an endless belt-shaped heat-fixing endless belt, and provides a fixing device for heating and fixing an object to be heated on a conveyed sheet material. According to another aspect of the present invention, the heat-fixing endless belt is stretched around the conveying roller to provide a fixing device that heats and fixes the heated object on the sheet material to be conveyed. According to the fifth aspect of the present invention, the conveyance roller is provided with a fixing device that heats and heats a heated body on a sheet material that is conveyed by heating with a heating element. According to a sixth aspect of the present invention, there is provided a fixing device in which the suction and peeling means starts suction in synchronization with the leading end of the sheet material conveyed to the suction port and heats and fixes a heated object on the conveyed sheet material. To do so. 8. The hollow suction member according to claim 7, wherein the suction port has a thin thickness in a fixing nip portion side direction formed by pressurizing a heat-fixing movable means and a pressure movable means in opposite directions to which the sheet material after fixing is conveyed. (EN) A fixing device for heating and fixing an object to be heated on a sheet material that is formed and conveyed so as to face the back surface of the sheet material that is conveyed to the thin thickness side.

According to another aspect of the present invention, the suction peeling means moves the suction port to a position where it approaches or contacts the sheet material when the leading edge of the sheet material conveyed by the suction port moving means reaches a predetermined position, and heat fixing is performed. A fixing device for heating and fixing an object to be heated on a sheet material that is conveyed by forming a gap between the movable means and the suction port is provided. According to a ninth aspect, in the fixing device according to the eighth aspect,
The suction port moving means moves the suction port in the front-back direction of the sheet material conveyance direction by the front-rear direction movement means to provide a fixing device for heating and fixing the object to be heated on the sheet material to be conveyed. To do. In the tenth aspect, the front-rear direction moving means applies a biasing force that moves the suction port in the front-back direction of the sheet material conveyance direction by the biasing force imparting member, and moves the suction port in the sheet material conveyance direction by the movement position regulation member. A fixing device for heating and fixing an object to be heated on a sheet material that is conveyed while controlling the position to move in the front-rear direction is provided. In the eleventh aspect of the present invention, there is provided a fixing device, wherein the suction port moving means moves the suction port in the vertical direction of the sheet material transport direction by the vertical direction moving means to heat and fix the heated object on the sheet material that is transported. Try to do it. In the twelfth aspect, the front-back direction moving means applies a biasing force that moves the suction port in the vertical direction of the sheet material transport direction by the biasing force imparting member, and moves the suction port in the sheet material transport direction by the movement position restricting member. A fixing device for heating and fixing an object to be heated on a sheet material that is conveyed by controlling a position of moving in the vertical direction is provided.

According to a thirteenth aspect of the present invention, there is provided a fixing device in which the suction and peeling means fixes the predetermined gap between the heat fixing fixing movable means and the suction port and heats and fixes the heated object on the conveyed sheet material. Try to do so. In a fourteenth aspect of the present invention, there is provided a fixing device for heating and fixing an object to be heated on a sheet material, which is conveyed, with a fixed gap between the heat fixing fixing movable means and the suction port being 1 mm to 5 mm. To do. In the fifteenth aspect, the suction and peeling means stops the movement and suction of the suction port after the suction port moves in accordance with the conveying direction and the speed at which the sheet material is conveyed to suck and peel off the sheet material. A fixing device that heats and fixes an object to be heated on a sheet material to be conveyed is provided. According to a sixteenth aspect of the present invention, there is provided a fixing device for heating and fixing an object to be heated on a sheet material, which is conveyed such that the sheet material is separated from the heat fixing movable means and the pressure movable means by a separating claw. To do so. Claim 1
In No. 7, the suction peeling means heats the sheet material separated from the heat-fixing movable means and the pressure movable means by the suction port of the slit-shaped suction port of the slit-shaped portion to peel and convey the sheet material. Try to provide a fixing device that heats and fixes the body. 19. The sheet material according to claim 18, wherein the suction peeling means sucks and peels off the sheet material separated from the heat fixing movable means and the pressure movable means by the suction port of the porous suction port of the porous shape portion and conveys the sheet material. A fixing device for heating and fixing the upper object to be heated is provided. In claim 19, the suction and peeling means sucks and peels the sheet material separated from the heat-fixing movable means and the pressure movable means, and opens and closes the suction port by the opening and closing means and conveys the sheet material. A fixing device for heating and fixing an object to be heated on a sheet material is provided. In claim 20, the opening / closing means heats an object to be heated on a sheet material which is conveyed by sliding the thin opening / closing plate in the shape of a thin thick plate through the suction port and slidingly driving the thin opening / closing plate by a drive unit. A fixing device for fixing is provided. In claim 21, toner is formed on the electrostatic latent image formed by the latent image forming means for forming an electrostatic latent image on the image bearing body charged by the charging means for charging the rotatably held image bearing body. 21. The toner image formed on the sheet material by the transfer means for transferring the toner image visualized by the developing means for adhering the toner to the sheet material according to any one of claims 1 to 20. An image forming apparatus is provided which is fixed by a fixing device and forms an image using an electrophotographic method.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are a schematic configuration diagram of a fixing device according to an embodiment of the present invention and a perspective view showing a configuration of a main part thereof. In FIG. 1, a heating target on a sheet material to be conveyed is heated and fixed. The fixing device 0 is rotatably supported to generate heat, and the heat fixing roller 1a of the heat fixing movable means 1 and the heat fixing roller 1a of the heat fixing movable means 1 are pressed to open the fixing nip portion (N). The pressure roller of the pressure movable unit 2 which is rotatably held, the pressure roller of the pressure movable unit 2, and the heat fixing movable unit 1 which are formed.
Sheet material (S) separated from the heat fixing roller 1a
Suction and peeling means 3 for sucking and peeling the sheet from the suction port 3a, and the tip of the sheet material (S) after heat fixing is separated from the fixing nip portion (N) with a simple configuration with a small number of parts. At this timing, the tip end of the sheet material (S) is sucked in the direction of peeling it off by the suction port 3a, and a force in the direction opposite to the winding direction is applied to the tip end of the sheet material (S). Even if it is possible to reliably prevent the sheet material (S) from winding around without using nails or the like, the fixing property is not deteriorated. Further, as shown in the drawing, a separating claw 6 is arranged to separate the sheet material (S) from the heat fixing roller 1a of the heat fixing movable means 1 or the pressure roller of the pressure moving means 2 not shown. By doing so, even if the separating claw 6 or the like is used, the occurrence of wrapping of the sheet material (S) having excellent durability can be further reliably prevented, and the fixing property can be further reduced. There is no.

Toner (t) to be heated which is an unfixed image
The sheet material (S) of the recording medium carrying the toner image of
While the conveying position is detected by the optical sensor of the sheet material detecting means 0b fixed to the apparatus main body 0a of the fixing device 0, the sheet is conveyed in the conveying direction shown by the arrow A and rotated in the direction shown by arrow B. The toner is heated and pressed in the fixing nip portion (N) formed by the heat-fixing roller 1a of the heat-fixing movable means 1 and the pressure roller of the pressure-movable means 2 rotating in the direction of arrow C in the figure. By heating and melting (t), the unfixed image is heat-fixed. Here, the heating fixing roller 1a of the heating fixing movable unit 1, which incorporates a heating element 1a ₁ such as a halogen heater, for fixing nip portion on the outer circumference a width of (N) is wide enough In addition, a heat insulating elastic member made of a soft heat resistant material such as foamed silicone rubber is provided. The structure of the pressure roller of the pressure movable means 2 is, for example, two layers including a surface layer 2b of a core metal 2a made of aluminum, stainless steel, carbon steel or the like, and a heat-resistant release layer made of fluorine resin or silicon rubber. It has a configuration of. Here, there is a case where the core metal 2a is hollow and has a halogen heater or the like as a heat source therein. The suction port 3a of the suction and peeling means 3 is movable in the opposite direction where the sheet material (S) after being heated and fixed by heating and melting the toner (t) is conveyed in the arrow (A) direction in the opposite direction. The hollow suction member 3 which is thin in the direction of the fixing nip portion (N) formed by pressurizing the heat-generating fixing roller 1a of the means 1 and the pressure roller of the pressure movable means 2
On the thin-walled side of b, the optimum predetermined distance (G) between the heat-fixing movable means 1 and the heat-fixing roller 1a is 1 mm which surely prevents wrapping even in a solid image at low cost.
It is fixedly set to 5 mm to 5 mm, and is formed so as to face the back surface of the fixing formation surface of the toner (t) of the conveyed sheet material (S) (see FIG. 2). Since the suction port 3a is formed in the thin wall thickness portion of the hollow suction member 3b on the fixing nip portion (N) side, the sheet material (S) is reliably sucked even in the small size and near the fixing nip portion (N). The fixing device 0 which can prevent the occurrence of wrapping even in a solid image at low cost.
Can be provided.

When the sheet material detecting means 0b detects a predetermined conveying position of the sheet material (S) after heat fixing, the control means 8 rotationally drives the drive motor (not shown) of the vacuum pump 3c which is always stopped. Starting, the communication pipe 3d for communicating the hollow suction member 3b with the vacuum pump 3c.
The hollow inside 3b ₁ of the hollow suction member 3b becomes a negative pressure via the above, and by applying a negative suction force in synchronization with the tip of the sheet material (S) conveyed to the suction port 3a, for example, Even if there is a solid image on the tip of the sheet material (S), the sheet material (S) has excellent durability without the use of a coating agent or separating claws, so that the sheet material (S) is reliably prevented from wrapping. Further, the suction port 3a does not cause a decrease, and the suction is stopped when the sheet material (S) is detected at a predetermined transport position, so that the resource-saving fixing device 0 is started.
Can be provided. That is, if the suction port 3a is constantly sucked, the heat energy is fixed without permission by cooling the heat fixing roller 1a of the heat fixing movable means 1 by the air flow in the direction of the arrow (D) shown in the figure. Although it is discarded, as described above, the suction port 3a starts sucking upon detection of a predetermined conveyance position of the sheet material (S), so the heat generation fixing roller 1a of the heat generation fixing movable means 1 is wasted. Since there is no need to cool down, it is possible to provide the fixing device 0 which saves resources. The suction peeling means 3 moves the suction port 3a of the suction port moving means 5 in the front-back direction of the sheet material (S) in the conveyance direction of the arrow (A) shown in the figure and in the front-back direction of the arrow (E) shown in the figure. The sheet material detecting means 0b is moved by the moving means 5a and the vertical moving means 5b which moves the suction port 3a in the up and down direction of the arrow (F) in the conveying direction of the arrow (A) of the sheet (S). By detecting the conveyance position of the sheet material (S) by the optical sensor of FIG.
When the front end of the sheet material (S) conveyed in the direction reaches a predetermined position, the control means 8 moves the suction port 3a to a position where it approaches or contacts the sheet material (S), The heat generation fixing roller 1a of the heat generation fixing movable means 1
Since the sheet material (S) is sucked by forming an appropriate gap (G) between the sheet material (S) and the suction port 3a, even under different severe conditions such as a solid image at the tip of the sheet material (S). , Excellent durability without using a coating agent, separating claws, etc. Further, the sheet material (S) can be efficiently and reliably prevented from being wound, so that the fixing property is not deteriorated.
Further, since the suction port 3a starts the stopped suction at a predetermined appropriate transport position of the sheet material (S), further,
It has become possible to efficiently provide the above-described fixing device 0 that saves resources.

Further, the suction and peeling means 3 is opened and closed.
By means of means 7, heat generation fixing of the heat generation fixing movable means 1
Separated from the roller 1a and the pressure roller of the pressure movable means 2
The suction port 3 for sucking and peeling off the sheet material (S)
Inside the hollow 3b communicating with a ₁The inside was kept under negative pressure
In this state, the sheet material detection means 0b uses an optical sensor, etc.
By detecting the transport position of the sheet material (S), the arrow shown in the figure
The leading edge of the sheet material (S) conveyed in the (A) direction is at a predetermined position.
When it reaches the storage position, the suction means is controlled by the control means 8.
3a is designed to open and close, so the arrow shown
The leading edge of the sheet material (S) conveyed in the (A) direction is at a predetermined position.
There is no time lag when reaching the storage, and the suction port 3a
The sheet material (S) is efficiently sucked by the
For example, there may be a solid image on the tip of the sheet material (S).
Even under severe different conditions, use a coating agent or separating nail.
Wraps sheet material (S) with excellent durability without use
To prevent the occurrence of heat generation more efficiently and reliably, and lower the fixability.
Does not occur, and the suction port 3a is
At the predetermined appropriate transport position for the sheet material (S),
Since it will start the pulling, it will be more efficient and resource saving.
It is now possible to provide Oki.

In FIG. 3, the suction and peeling means 3 is provided.
Is configured to move the suction port 3a in the front-back direction of the arrow (E) shown in the conveyance direction of the arrow (A) of the sheet material (S) and the front-rear direction moving means 5a and the suction port 3a. The vertical movement means 5b for moving in the up and down direction of the arrow (F) shown in FIG.
By the suction port moving means 5 consisting of, by detecting the transport position by the optical sensor of the sheet material detecting means 0b,
When the front end of the sheet material (S) conveyed in the conveying direction indicated by the arrow (A) reaches a predetermined position, the control means 8 causes the drive source 5a of the front-back direction moving means 5a.
₃ or the stepping motor of the drive source 5b ₃ of the vertical moving means 5b is started to rotate.

[0019] The longitudinal direction moving unit 5a includes a compression spring urging force applying member 5a ₁ to impart a biasing force to move the arrow (A) direction shown in the suction port 3a of the sheet material (S), the suction becomes the mouth 3a from the eccentric cam of the movement position regulating member 5a ₂ for regulating the position that moves in the front-rear direction of the arrow in the conveying direction of the shown (E) of the arrow shown in the sheet material (S) (a), said control means 8, the stepping motor of the drive source 5a ₃ starts rotational driving, and the eccentric cam of the moving position regulating member 5a ₂ rotates clockwise in the arrow (H) shown to guide the suction port 3a. The sheet material (S) is guided by the member 5a ₄ and moved in the direction of the arrow (E) shown in the drawing.
Move from the front-back direction to the position where it approaches or contacts
Since the sheet material (S) is sucked by forming an appropriate gap (G) between the heat generation fixing roller 1a of the heat generation fixing movable means 1 and the suction port 3a, for example, a solid material is attached to the tip of the sheet material (S). Even under different severe conditions such as images, the sheet material (S) has excellent durability without the use of a coating agent or separating claws, and can more efficiently and reliably prevent the occurrence of wrapping of the sheet material (S) and fixability. Further, since the suction port 3a moves from the front-rear direction and the suction port 3a starts the stopped suction at a predetermined appropriate transport position of the sheet material (S), the suction is further efficiently performed. Resource-saving fixing device 0
Can be provided. Said vertical moving means 5b comprises a compression spring biasing force applying member 5b ₁ for imparting a biasing force to move the suction port 3a to the arrow (I) direction of the illustrated sheet material (S), the suction port 3a It consists eccentric cam moving position regulating member 5b ₂ for regulating the position of moving in the vertical direction of the conveying direction of the arrow (F) of the arrow shown in the sheet material (S) (a), said by the control unit 8 start the stepping motor the rotation of the driving source 5b _3, the eccentric cam of the moving position regulating member 5b ₂ is rotated in the direction of the arrow shown (J), with the guide member 5b ₅ the suction opening 3a By guiding and moving in the up and down direction of the arrow (F) shown in the drawing to approach or contact the sheet material (S) from the up and down direction to the heat fixing roller 1a of the heat fixing fixing movable means 1. Suitable distance with the suction port 3a Since (G) is formed and the sheet material (S) is sucked, for example, even under different severe conditions such as a solid image at the tip of the sheet material (S), a coating agent, a separating claw or the like is used. The sheet material (S) can be efficiently and reliably prevented from being wound around without causing deterioration in fixing property, and further, the suction port 3a can be moved by moving in the vertical direction. Since the suction which is stopped is started at a predetermined appropriate conveyance position of the sheet material (S), it is possible to further efficiently provide the resource-saving fixing device 0.

The suction and peeling means 3 moves the suction port 3a of the suction port moving means 5 in the front-back direction of the arrow (E) shown in the conveyance direction of the arrow (A) of the sheet material (S). By the above-mentioned front-back direction moving means 5a or the above-mentioned up-down direction moving means 5b that moves the suction port 3a in the up-down direction of the arrow (F) shown in the conveying direction of the arrow (A) shown in the sheet material (S). , Sheet material (S) shown arrow (A)
The suction port 3a moves in accordance with the transport direction and the speed at which the sheet material (S) is sucked and peeled off, and then the suction is stopped together with the movement of the suction port 3a. Therefore, for example, even under different severe conditions such as a solid image on the tip of the sheet material (S), the durability of the sheet material (S) is excellent without using a coating agent or a separating claw. Further, the occurrence of wrapping can be prevented more efficiently and surely without causing a decrease in fixing property.
Further, since the suction port 3a starts and stops the suction which is stopped in good timing at a predetermined proper transport position of the sheet material (S), the fixing device 0 which saves resources is provided more efficiently. I can do it now.

FIG. 4 is a sectional view showing the structure of the opening / closing means. The opening / closing means 7 is a thin-walled opening / closing plate 7a in the shape of a thin-walled thick plate that slides to open / close the suction port 3a, and the thin-walled thickness. And a drive unit 7b for slidingly driving the opening / closing plate 7a,
Inside the hollow 3b ₁ communicating with the suction port 3a for sucking and peeling the sheet material (S) separated from the heat fixing roller 1a of the heat fixing movable means 1 and the pressure roller of the pressure movable means 2. With the negative pressure kept in advance, the sheet material (S) is detected by the optical sensor of the sheet material detecting means 0b.
The detection of the transport position of the, when the leading end of the sheet material conveyed arrows shown (A) in the direction (S) has reached a predetermined position, by the control unit 8, the rotation of the drive motor 7b ₁ of the drive unit 7b Since the drive is adapted to open and close the suction port 3a via the pinion 7b ₂ and the rack 7b ₃ , the tip of the sheet material (S) conveyed in the direction of the arrow (A) shown in the drawing has a simple structure. When there is a predetermined position, there is no time lag, and the suction operation of the sheet material (S) by the suction port 3a is efficiently performed.
Even under different severe conditions such as a solid image on the tip of the sheet, it is excellent in durability without using a coating agent or separating claws, and more efficiently and reliably prevents the occurrence of wrapping of the sheet material (S). In addition, since the fixing property is not deteriorated and the suction port 3a starts the stopped suction at a predetermined appropriate transport position of the sheet material (S), the resource saving is further efficient. The fixing device 0 can be provided.

In FIG. 5, a fixing device 00 for heating and fixing an object to be heated on a sheet material to be conveyed is conveyed to the heat fixing roller 1a of the heat fixing movable means 1 which is rotatably supported and generates heat. Through the heat-fixing endless belt 1b stretched around the roller 4 and the heat-fixing endless belt 1b of the heat-fixing movable means 1, the heat-fixing roller 1a is pressed to form a fixing nip portion (N). The pressure roller of the pressure movable means 2 movably held, the pressure roller of the pressure movable means 2 and the sheet material (S) separated from the heat generation fixing endless belt 1b of the heat generation fixing movable means 1. And the suction and peeling means 3 for sucking and peeling off from the suction port 3a with a simple structure having a small number of parts.
The sheet material (S) after heat-fixing is separated from the heat-fixing endless belt 1b up to the conveying roller 4 including the fixing nip portion (N) and the wide fixing nip portion (n) at a predetermined timing, and the sheet material (S) The tip of S) is attached to the suction port 3a.
The sheet material (S) is sucked in the direction to peel it off, and a force in the direction opposite to the winding direction can be applied to the tip of the sheet material (S), so the sheet material has excellent durability without the use of coating agents or separation claws. Even if the occurrence of (S) wrapping is surely prevented,
It does not cause deterioration of fixing property. Such a heating-type fixing device 00 which is used by stretching the heat-fixing endless belt 1b for heat-fixing between the heat-fixing roller 1a of the heat-fixing movable means 1 and the conveying roller 4 is a sheet material ( S) is reliably conveyed, the rise time is short, the toner has an offset preventing effect, and oilless or a small amount of oil can be applied to save resources. Further, as shown in the drawing, the separation claw 6 is arranged, and the heat-fixing endless belt 1b of the heat-fixing movable means 1 or the heat-fixing endless belt 1b, or
If the sheet material (S) is separated from the pressure roller of the pressure movable means 2 (not shown), even if the separation claw 6 or the like is used, the durability is excellent and the sheet material (S) is wound. Further, the occurrence is reliably prevented, and the fixing property is not deteriorated.

Toner (t) to be heated which is an unfixed image
The sheet material (S) of the recording medium carrying the toner image of
While the conveyance position is detected by an optical sensor or the like of the sheet material detecting means 0b fixed to the apparatus main body 0a of the fixing device 00, the sheet is conveyed in the conveyance direction of the arrow (A) shown in the figure, and the arrow (B) shown in the figure. The fixing nip portion (N) between the heat generation fixing roller 1a of the heat generation fixing movable means 1 rotating in the direction and the pressure roller of the pressure movable means 2 rotating in the direction of the arrow (C) shown in FIG. Since the unfixed image is sufficiently heat-fixed by heating and pressing the heat-fixing endless belt 1b to the conveying roller 4 of the nip portion (n) to heat-melt the toner (t), the rising time is increased. It is short and has the effect of preventing the toner (t) from being offset by the belt, and it is possible to apply oilless or a small amount of oil and save resources. Here, the heating fixing roller 1a of the heating fixing movable unit 1, which incorporates a said heating element 1a ₁ such as a halogen heater is wide enough the width of the fixing nip (N) on its outer periphery Therefore, a heat-insulating elastic member made of a soft heat-resistant material such as foamed silicone rubber is provided. The structure of the pressure roller of the pressure movable means 2 is, for example, two layers including a surface layer 2b of a core metal 2a made of aluminum, stainless steel, carbon steel or the like, and a heat-resistant release layer made of fluorine resin or silicon rubber. It has a configuration of. Here, there is a case where the core metal 2a is hollow and has a halogen heater or the like as a heat source therein.

FIG. 6 is a schematic configuration diagram of a fixing device according to another embodiment of the present invention. In FIG. 6, a fixing device 000 that heats and fixes an object to be heated on a sheet material to be conveyed is shown in FIG.
The heat-fixing movable unit 1 is rotatably supported and generates heat.
The heat generating fixing endless belt 1b stretched around the conveying roller 4 composed of the heat generating fixing roller 1a and the heating element 4a for heating, and the heat generating fixing endless belt 1b of the heat generating fixing movable means 1 generate the heat. The pressure roller of the pressure movable means 2 rotatably held to pressurize the fixing roller 1a to form the fixing nip portion (N), the pressure roller of the pressure movable means 2 and the heat generation fixing movable. The heat-fixing endless belt 1b of the means 1 comprises the suction peeling means 3 for sucking and peeling the sheet material (S) separated from the endless belt 1b by the suction port 3a. The heating element 4a for heating the leading edge of the rear sheet material (S) including the fixing nip portion (N) and the wide fixing nip portion (n).
The sheet material (S) is conveyed at a predetermined timing to move away from the heat-fixing endless belt 1b up to the conveying roller 4.
Suction the tip of the with the suction port 3a,
Since the force in the direction opposite to the wrapping direction can be applied to the tip of the sheet material (S), it has excellent durability without the use of coating agent or separation claws, and the occurrence of wrapping of the sheet material (S) is guaranteed. Even if it is prevented, the fixing property is not deteriorated. Such a heating-type fixing device 000 using the heat-fixing endless belt 1b for heat-fixing, which is stretched around the conveying roller 4 composed of the heating element 4a to be heated, has a shorter rise time, and has a shorter toner ( It has the effect of preventing the belt offset of t), oilless or a small amount of oil can be applied, and it is also resource saving. Further, by disposing the separation claw 6 as shown in the drawing, the sheet material (S) is fed from the heat-fixing endless belt 1b of the heat-fixing movable means 1 or the pressure roller of the pressure movable means 2 not shown. If the separation claws 6 and the like are used,
The durability is excellent and the occurrence of wrapping of the sheet material (S) is further reliably prevented, and further, the fixing property is not deteriorated. Toner (t) on the heated body that is an unfixed image
The sheet material (S) of the recording medium carrying the toner image of
While the conveyance position is detected by the optical sensor of the sheet material detecting means 0b fixed to the apparatus main body 0a of the fixing device 000, the sheet is conveyed in the conveyance direction of the arrow (A) shown in the figure, and the arrow (B) shown in the figure. The fixing nip portion (N) between the heat generation fixing roller 1a of the heat generation fixing movable means 1 rotating in the direction and the pressure roller of the pressure movable means 2 rotating in the direction of the arrow (C) shown in FIG. The toner (t) is heated and fused through the heat-fixing endless belt 1b up to the conveying roller 4 including the heating element 4a that heats the nip portion (n), and the unfixed image is further melted by heating and melting the toner (t). ,
Since the toner is sufficiently heated and fixed, the rise time is shorter, the belt offset of the toner (t) is prevented, and it is possible to apply oilless or a small amount of oil and save resources. Here, the heating fixing roller 1a of the heating fixing movable unit 1, which incorporates a said heating element 1a ₁ such as a halogen heater is wide enough the width of the fixing nip (N) on its outer periphery Therefore, a heat-insulating elastic member made of a soft heat-resistant material such as foamed silicone rubber is provided. The structure of the pressure roller of the pressure movable means 2 is, for example, two layers including a surface layer 2b of a core metal 2a made of aluminum, stainless steel, carbon steel or the like, and a heat-resistant release layer made of fluorine resin or silicon rubber. It has a configuration of. Here, there is a case where the core metal 2a is hollow and has a halogen heater or the like as a heat source therein.

FIG. 7 is a diagram showing a main configuration of a fixing device according to another embodiment of the present invention, in the figure, the slit-shaped suction port 3a ₁ of the suction port 3a of the suction peel means 3 The width of each slit-shaped portion is a nozzle shape processed to 0.5 mm to 20 mm. The sheet material (S) after the heat fixing by heating and melting the toner (t) through this nozzle is conveyed in the direction of the arrow (A) shown in the drawing, and presses the heat fixing roller 1a and the pressure roller 2 in the opposite directions. On the thin-walled side of the hollow suction member 3b which is thinned toward the fixing nip portion (N) side formed, the heat-fixing movable means 1 is formed.
Of the sheet material (S) conveyed while forming an optimum gap (G) with the heat fixing roller 1a or the heat fixing endless belt 1b. Since it is formed, it can efficiently generate negative pressure,
Further, the occurrence of winding of the sheet material (S) is further reliably prevented, and the fixing property is not further deteriorated. That is, the suction port 3a of this embodiment is composed of a large number of parallel slit-shaped openings, and the opening area is smaller than the simple opening (large opening area) as in the above-described embodiment, so that There is a merit that pressure can be supplied efficiently.

In FIG. 8, the suction and peeling means 3 is used.
Porous shaped suction opening 3a ₂ of the aspiration opening 3a are arrows sheet material after heat-fixing by a nozzle which is processed to porous heating and melting the toner (t) (S) is shown (A) Direction of the fixing nip portion (N) formed by pressing the heat fixing roller 1a of the heat fixing movable means 1 and the pressure roller of the pressure movable means 2 in the opposite direction. On the thin thickness side of the hollow suction member 3b,
Optimum distance (G) between the heat-fixing movable roller 1 and the heat-fixing roller 1a or the heat-fixing endless belt 1b.
Since the sheet material (S) is formed so as to face the back surface of the fixing formation surface of the toner (t), the negative pressure can be efficiently generated to prevent the sheet material (S) from winding. Further, the occurrence is reliably prevented, and the fixing property is not deteriorated. That is, this embodiment has a structure in which a plate having a large number of small holes is applied to the opening 3a instead of the slit in the embodiment of FIG. According to this embodiment, since the opening area of the opening 3a is limited, the negative pressure can be supplied more efficiently.

In FIG. 9, an image forming apparatus 20 for forming an image by transferring a toner image formed by an electrophotographic method onto a recording sheet of a sheet material (S) of an object to be transferred and then fixing it.
Is a rotatably held image carrier 21, a charging unit 22 for charging the image carrier 21, and a latent image forming electrostatic latent image on the image carrier 21 charged by the charging unit 22. An image forming unit 23, a developing unit 24 that attaches toner (t) to the electrostatic latent image formed by the latent image forming unit 23 to make it visible, and a toner image visualized by the developing unit 24. Transfer means 25 for transferring the sheet onto the recording sheet of the sheet material (S),
The fixing device 0 (00, 00) for fixing the toner image formed on the recording sheet of the sheet material (S) by the transfer means 25.
0), it is possible to form a high-quality high-speed color image by reliably preventing occurrence of wrapping of the sheet material (S) with excellent durability without using a coating agent or a separating claw.
The image forming apparatus 20 provided with the fixing device 0 (00,000) is a full-color image forming apparatus of the 4-photoreceptor belt 1-pass type which is related to a recording system of 4 image stations. ), And the image forming process means 50 is arranged along the rotation direction of the conveyor belt 26 which rotates in the counterclockwise conveyance direction indicated by the arrow (K). The fixing means 0 (00, 0
00) and the registration roller pair 28 of the sheet feeding means 27, and below the conveyor belt 26, the image forming process means 50 is formed in order from the upstream side in the rotating direction of the conveyor belt 26. As an example, the image forming process of the cyan photoconductor belt 21a of the image carrier 21 is formed on the first image station 51, and the image of the magenta photoconductor belt 21b of the image carrier 21 is formed on the second image station 52. A process for forming an image formed by the yellow photoconductor belt 21c of the image carrier 21 on the third image station 53, and an image formed by the black photoconductor belt 21d on the image carrier 21 for the fourth image station 54. The process is further followed by the fixing means 0 (0
0,000) and the like are arranged.

Focusing on the first image station 51, the image forming process is in accordance with a general electrostatic recording system, and the charging means 22 arranged in the plurality of image forming areas in the dark. An electrostatic latent image of a predetermined color is written by the cyan light writing unit 23a of the latent image forming means 23 on the cyan photoconductor belt 21a of the image carrier 21 uniformly charged by the cyan charger 22a, and this static The electrostatic latent image is visualized by the cyan developing device 24a of the developing means 24, and the cyan toner image is conveyed by the cyan transferring device 25a of the transferring device 25 arranged in the plurality of image forming areas 4. The residual toner adhered onto the cyan photoconductor belt 21a of the image carrier 21 after transfer is transferred to the recording paper of the sheet material (S) conveyed by the belt 26. Cyan cleaning unit 29a of the cleaning means 29 disposed in a plurality of image forming region
It has been removed in step 3 and is ready for the next step. Next, in the second image station 52, similarly,
The magenta photoconductor belt 21 of the image carrier 21 uniformly charged by the magenta charger 22b of the charging means 22 arranged in the plurality of image forming areas in the dark.
A magenta light writing unit 23b of the latent image forming means 23 writes an electrostatic latent image of a predetermined color on b, and the electrostatic latent image is magenta of the developing means 24 arranged in the plurality of image forming areas 4. The magenta toner image is visualized by the developing device 24b and the magenta toner image is formed in the plurality of image forming regions 4
Magenta transfer device 25 of the transfer means 25 disposed inside
b, the residual toner, which is transferred to the recording sheet of the sheet material (S) placed on the conveyor belt 26 and conveyed, and adhered on the magenta photosensitive belt 21b of the image carrier 21 after the transfer, The cyan cleaning means 29a of the cleaning means 29 arranged in the plurality of image forming areas removes the toner and prepares for the next step.

In the third image station 53,
Similarly, the latent image is formed on the yellow photoconductor belt 21c which is the image carrier 21 uniformly charged by the yellow charger 22c of the charging unit 20 arranged in the plurality of image forming areas in the dark. A yellow light writing unit 23c of the image forming unit 23 writes an electrostatic latent image of a predetermined color, and the electrostatic latent image is written by the yellow-developing unit 24c of the developing unit 24 arranged in the plurality of image forming areas 4. A sheet material which is visualized and the yellow toner image is placed on the conveyor belt 26 and conveyed by the yellow transfer device 25c of the transfer means 25 arranged in the plurality of image forming areas 4 ( Transfer to S) recording paper,
After the transfer, the residual toner adhering to the yellow photoconductor belt 21c, which is the image carrier 21, is removed by the yellow cleaning means 29c of the cleaning means 29 arranged in the plurality of image forming areas, and the next step is performed. It is ready. The fourth image station 5
4, similarly, the black charger 22 of the charging means 22 arranged in the plurality of image forming areas in the dark.
The latent image forming means 23 is formed on the black photoconductor belt 21d, which is the image carrier 21 uniformly charged by d.
The electrostatic latent image of a predetermined color is written by the black light writing unit 23d, and the electrostatic latent image is visualized by the black developing device 24d of the developing means 24 arranged in the plurality of image forming areas, The black toner image is transferred to the transfer means 25 arranged in the plurality of image forming areas.
By the black transfer device 25d of
The residual toner, which is transferred to the recording sheet of the sheet material (S) that is placed and conveyed on the sheet, is attached to the black photosensitive belt 21d that is the image carrier 21 after the transfer is the plurality of image forming areas. The cleaning means 2 arranged inside
It is possible to form a full-color image by being removed by the black cleaning means 29d of No. 9 and being prepared for the next step, and being successively transferred.

After the final transfer, the full-color toner image carried on the recording sheet of the sheet material (S) which is placed and conveyed on the conveyor belt 26 is transferred to the fixing unit 0 (00,
000) to obtain a full-color high-quality final image on the recording material of the sheet material (S). Therefore, the fixing device 0 which has excellent durability and can reliably prevent occurrence of wrapping of the sheet material (S) and can form a high-quality high-speed color image without using a coating agent or a separating claw.
It is now possible to provide the image forming apparatus 20 having the above. The charging unit 22, the transfer unit 25, the cleaning unit 29, and the like in the image forming apparatus 20 are not particularly limited in terms of method, method, configuration, material, etc. , Simply by removing the cleaning means 29,
Other ideas and configurations are the same.

[0031]

Since the present invention is constituted as described above, according to the invention of claim 1, excellent durability is achieved without using a coating agent, separating claws, etc. It is now possible to provide a fixing device that reliably prevents the occurrence of the deterioration of the fixing property.
According to the second aspect of the present invention, the number of parts is small and the structure is simple, and the durability is excellent without using a coating agent, separating claws or the like, and the occurrence of wrapping of the sheet material is reliably prevented and the fixing property is deteriorated. It is now possible to provide a fixing device that does not generate According to the third aspect of the invention, the rise time is short and the toner offset is prevented,
It is possible to apply oilless or small amount of oil and save resources.
It has become possible to provide a fixing device which is excellent in durability without using a coating agent, separating claws, or the like, and which reliably prevents the sheet material from being wrapped around and does not cause a decrease in fixing property. According to the fourth aspect of the invention, the sheet material (S) is reliably conveyed, and the sheet material (S) is excellent in durability without using a coating agent, separation claws, etc., and the sheet material is reliably prevented from being wound and fixed. It has become possible to provide a fixing device that does not cause deterioration of the property.

According to the invention of claim 5, the sheet material (S)
Is reliably transported, the rise time is even shorter,
It has the effect of preventing toner offset, it is possible to apply oil-less or small amount of oil to save resources, and it has excellent durability without using coating agent or separating claws, and reliably prevents the occurrence of wrapping of sheet material. As a result, it is possible to provide a fixing device that does not cause a decrease in fixing property.
According to the invention of claim 6, since the suction port starts the suction stopped at a predetermined appropriate conveying position of the sheet material, the resource is efficiently saved, and the durability is achieved without using a coating agent or a separating claw. It is now possible to provide a fixing device that reliably prevents the winding of the sheet material and does not cause a decrease in fixing property. According to the invention of claim 7,
It is compact and reliably sucks the sheet material even near the fixing nip portion, and at low cost even with solid images, it has excellent durability without the use of coating agents or separating claws, and more reliably prevents the occurrence of sheet material wrapping. As a result, it is possible to provide a fixing device that does not cause a decrease in fixing property. According to the invention of claim 8, since the suction port is moved to start the suction stopped at a predetermined appropriate conveying position of the sheet material, the coating agent, the separating claw or the like is used more efficiently and resource saving. It has become possible to provide a fixing device which is excellent in durability and reliably prevents occurrence of wrapping of a sheet material and does not cause deterioration in fixing property. According to the invention of claim 9, the suction port moves in the front-rear direction of the sheet material conveyance direction to start the suction stopped at a predetermined appropriate conveyance position of the sheet material, so that it is more efficient and resource saving, It has become possible to provide a fixing device which is excellent in durability without using a coating agent, separating claws, or the like, and which reliably prevents the sheet material from being wrapped around and does not cause a decrease in fixing property.

According to the tenth aspect of the present invention, the suction port moves in the front-back direction of the sheet material conveying direction to start the suction stopped at a predetermined appropriate conveying position of the sheet material. Due to resources, even under different severe conditions such as a solid image on the tip of the sheet material, it has excellent durability without using coating agents or separation claws, and reliably prevents the sheet material from winding and fixes it. It has become possible to provide a fixing device that does not cause deterioration of the property. According to the invention of claim 11, the suction port moves in the vertical direction of the sheet material conveying direction to start the suction stopped at a predetermined appropriate conveying position of the sheet material. It has become possible to provide a fixing device which is excellent in durability without using a coating agent, separating claws, or the like, and which reliably prevents the sheet material from being wrapped around and does not cause a decrease in fixing property. According to the twelfth aspect of the present invention, the suction port moves in the vertical direction of the sheet material conveyance direction to start the suction stopped at a predetermined appropriate conveyance position of the sheet material, so that it is more efficient and resource saving, Even under different severe conditions such as a solid image on the tip of the sheet material, it has excellent durability without using coating agents or separating claws, and reliably prevents wrapping of the sheet material to lower the fixability. It is now possible to provide a fixing device that does not generate According to the thirteenth aspect of the present invention, the optimum predetermined interval is fixedly set, and the durability is excellent without using a coating agent or a separating claw, and the occurrence of wrapping of the sheet material is reliably prevented and the fixability is improved. It is now possible to provide a low-cost fixing device that does not cause a decrease in the temperature. Claim 14
According to the invention, the optimum predetermined distance is 1 mm to 5 mm.
A low-cost fixing device that is fixedly set on the sheet, has excellent durability without using a coating agent, separating claws, etc., and further reliably prevents the occurrence of wrapping of the sheet material and does not cause deterioration in fixing property. Can be provided.

According to the fifteenth aspect of the present invention, the suction port is moved and stopped at a predetermined appropriate conveying position of the sheet material to start suction to suck the sheet material and after peeling the sheet material. Stopping the movement and suction of the suction port makes it more efficient and resource-saving, and has excellent durability without the use of coating agents or separating claws. It has become possible to provide a fixing device that does not generate. According to the sixteenth aspect of the present invention, the fixing device is excellent in durability without using a coating agent, separating claws or the like, and more reliably prevents the sheet material from being wound around, thereby preventing further deterioration of the fixing property. Can be provided. According to the invention of claim 17, the negative pressure is efficiently generated, the durability is excellent without using the coating agent, the separating claws, etc., and the occurrence of the winding of the sheet material is more surely prevented to further improve the fixing property. It is now possible to provide a fixing device that does not cause deterioration. According to the invention of claim 18, the negative pressure is efficiently generated, and the durability is excellent without using a coating agent, a separating claw, or the like, more efficiently and reliably preventing the occurrence of winding of the sheet material, and further fixing. It has become possible to provide a fixing device that does not cause deterioration of the property. According to the invention of claim 19, even under different severe conditions such as a solid image on the leading edge of the sheet material, excellent durability is achieved without using a coating agent, separation claws, or the like, and the occurrence of wrapping of the sheet material occurs. It has become possible to provide a resource-saving fixing device that is surely prevented and does not cause deterioration in fixing property. According to the twentieth aspect of the invention, when the leading edge of the sheet material reaches a predetermined position with a simple structure, the suction port can be efficiently opened and closed by opening and closing the suction port without a time lag, and the sheet material can be efficiently sucked. Even under different severe conditions such as a solid image at the tip of the sheet, excellent durability is achieved without using coating agents or separation claws, and the occurrence of sheet material wrapping is reliably prevented, resulting in a decrease in fixability. It is now possible to provide a resource-saving fixing device that does not cause the problem. According to the invention of claim 21, a fixing device which is excellent in durability without using a coating agent, separating claws or the like, can surely prevent occurrence of wrapping of a sheet material, and can form a high-quality high-speed color image. It has become possible to provide an image forming apparatus having the above.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a fixing device according to an exemplary embodiment of the present invention.

FIG. 2 is an enlarged perspective view illustrating a main part of a fixing device according to an exemplary embodiment of the present invention.

FIG. 3 is an enlarged view illustrating another main part of the fixing device according to the embodiment of the present invention.

FIG. 4 is an enlarged view illustrating another main part of the fixing device according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a fixing device according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating a fixing device according to another embodiment of the present invention.

FIG. 7 is an enlarged perspective view illustrating a main part of a fixing device according to another exemplary embodiment of the present invention.

FIG. 8 is an enlarged perspective view illustrating a main part of a fixing device according to another exemplary embodiment of the present invention.

FIG. 9 is an explanatory diagram illustrating an image forming apparatus including a fixing device according to an exemplary embodiment of the present invention.

FIG. 10 is an explanatory diagram illustrating a conventional fixing device.

[Explanation of symbols]

0 fixing device, 00 fixing device, 000 fixing device, 0
a device main body, 0b sheet material detection means 1 heat generation fixing movable means, 1a heat generation fixing roller, 1a ₁
Heating element, 1b heat generation fixing endless belt 2, pressure movable means, 2a core metal, 2b surface layer 3, suction peeling means, 3a suction port, 3a ₁ slit shape suction port, 3a ₂ porous shape suction port, 3b hollow suction member, 3b ₁ inside hollow, 3c vacuum pump, 3d
Communication pipe 4 Conveying rollers, 4a Heating element 5 Suction port moving means, 5a Front-back direction moving means, 5a ₁
Biasing force imparting member, 5a ₂ moving position regulating member, 5a ₃
Drive source, 5a ₄ guide member, 5b vertical movement means, 5b ₁ urging force applying member, 5b ₂ movement position regulation member, 5b ₃ drive source, 5b ₄ guide member 6 separation claw 7 opening / closing means, 7a thin wall opening / closing plate, 7b drive part, 7
b ₁ , drive motor, 7b ₂ , pinion, 7b ₃ , rack 8 control means 20 image forming apparatus 21 image carrier, 21a cyan photosensitive belt, 21b
Magenta photoconductor belt, 21c yellow photoconductor belt, 21d black photoconductor belt 22 charging means, 22a cyan charger, 22b magenta charger, 22c yellow charger, 22d black charger 23 latent image forming means, 23a cyan light writing unit , 23b magenta light writing unit, 23c yellow light writing unit, 23d black light writing unit 24 developing means, 24a cyan developing device, 24b magenta developing device, 24c yellow developing device, 24d black developing device 25 transfer means, 25a cyan transferring device, 25b Magenta transfer device, 25c Yellow transfer device, 25d Black transfer device 26 Conveyor belt 27 Paper feeding means 28 Registration roller pair 29 Cleaning means, 29a Cyan cleaning means, 29b Magenta cleaning means, 2 c Yellow cleaning means, 29d Black cleaning means 50 Image forming process means 51 First image station 52 Second image station 53 Third image station 54 Fourth image station 100 Fixing device 101 Fixing roller 101a Core bar 102 Conveying roller , 102a heating means 103 fixing belt 104 pressure roller, 104a core metal, 104b surface layer

Claims (21)

[Claims] 1. In a fixing device for heating and fixing an object to be heated on a conveyed sheet material, a heat fixing fixing movable means for rotatably supported and generating heat, and a fixing nip for pressurizing the heat fixing fixing movable means. And a suction and peeling means for sucking and peeling the sheet material separated from the pressure movable means and the heat-fixing movable means. Fixing device. 2. The fixing device according to claim 1, wherein the heat-fixing movable means comprises a roller-shaped heat-fixing roller. 3. The fixing device according to claim 1, wherein the heat-fixing movable means includes a heat-fixing endless belt having an endless belt shape. 4. The fixing device according to claim 3, wherein the heat-fixing endless belt is stretched around a conveying roller. 5. The fixing device according to claim 4, wherein the conveying roller includes a heating element for heating. 6. The fixing device according to claim 1, 2, 3, 4, or 5, wherein the suction and peeling means starts suction in synchronization with the leading end of the sheet material conveyed to the suction port. And fixing device. 7. The fixing device according to claim 1, 2, 3, 4, 5, or 6, wherein the suction port is movable in the opposite direction to the heat-fixing movable unit in which the sheet material after fixing is conveyed and the pressure movable member. A fixing device, which is formed so as to face a back surface of a sheet material conveyed to a thin thickness side of a hollow suction member which is thin in a fixing nip portion side direction formed by pressurizing means. 8. The fixing device according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the suction / peeling means causes the leading end of the sheet material to be conveyed to a predetermined position by the suction port moving means. When reaching, the fixing device is characterized in that the suction port is moved to a position where it approaches or comes into contact with the sheet material, and a gap is formed between the heat generation fixing movable means and the suction port. 9. The fixing device according to claim 8, wherein the suction port moving unit includes a front-back direction moving unit that moves the suction port in the front-back direction of the sheet material conveying direction. 10. The fixing device according to claim 9,
The front-back direction moving means includes a biasing force imparting member for imparting a biasing force that moves the suction port in the front-back direction of the sheet material conveyance direction,
A fixing device comprising a moving position regulating member for regulating a position where the suction port is moved in the front-back direction of the sheet material conveying direction. 11. The fixing device according to claim 7, 8, 9 or 10, wherein the suction port moving unit includes a vertical direction moving unit that moves the suction port in the vertical direction of the sheet material conveying direction. And fixing device. 12. The fixing device according to claim 11, wherein the front-back direction moving means includes a biasing force applying member for applying a biasing force that moves the suction port in the vertical direction of the sheet material conveyance direction, and the suction port. A fixing device comprising a moving position restricting member that restricts a position where the sheet material moves in the vertical direction of the conveying direction. 13. The fixing device according to claim 1, 2, 3, 4, 5 or 6, wherein the suction and peeling means has a fixed gap fixed between the heat fixing fixing movable means and the suction port. A fixing device characterized by the above. 14. The fixing device according to claim 13, wherein the fixed gap between the heat-fixing movable means and the suction port is
A fixing device having a length of 1 mm to 5 mm. 15. The fixing device according to claim 1, wherein the suction / peeling means has a suction port that moves in accordance with a conveying direction and a speed at which the sheet material is conveyed, A fixing device characterized by stopping the movement and suction of the suction port after sucking and peeling. 16. The fixing device according to claim 1, further comprising: a separating claw that separates the sheet material from the heat fixing movable means and the pressure movable means. . 17. The fixing device according to claim 1, wherein the suction and peeling means sucks and peels a sheet material separated from the heat fixing fixing movable means and the pressure movable means. Is provided with a slit-shaped suction port of the slit-shaped portion. 18. The fixing device according to claim 1, wherein the suction and peeling means sucks and peels a sheet material separated from the heat fixing movable means and the pressure movable means. Is provided with a porous shape suction port of a porous shape part. 19. The fixing device according to claim 1, wherein the suction and peeling means sucks and peels a sheet material separated from the heat fixing movable means and the pressure movable means. The fixing device is provided with an opening / closing unit that opens and closes under a negative pressure. 20. The fixing device according to claim 19, wherein the opening / closing means includes a thin-walled thick-plate opening / closing plate having a thin-walled thick-plate shape that slides along the suction port, and a drive unit that slidably drives the thin-wall thick plate. The fixing device is characterized in that 21. An image carrier that is rotatably held in an image forming apparatus for forming an image by transferring a toner image formed by using an electrophotographic method onto a sheet material of a transfer target, and then fixing the toner image. Charging means for charging the image carrier, latent image forming means for forming an electrostatic latent image on the image carrier charged by the charging means, and electrostatic latent image formed by the latent image forming means. A developing unit that attaches toner to visualize the toner image; a transfer unit that transfers the toner image visualized by the developing unit onto a sheet material; and a fixing unit that fixes the toner image formed on the sheet material by the transfer unit. An image forming apparatus, comprising: the fixing device according to claim 1.