JP2009181055A - Recording material cooling device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce disorder due to contact of an image in a molten state on a recording material with a belt when sandwiching and conveying the recording material by two conveyance belts. <P>SOLUTION: Paper P on which a toner image T is fixed by a fixing part 15 is put on the conveyance belt 72 with the toner image T set on the second conveyance belt 64 and is conveyed in the direction of an arrow D. The paper P butts against a portion stretched near a first conveyance roll 61a of the first conveyance belt 62, is placed on the first conveyance belt 62, and is conveyed in a region R1 to the vicinity of a second conveyance roll 63a. When the paper P is conveyed to the vicinity of the second conveyance roll 63a, the paper P butts against the second conveyance belt 64 by the first conveyance belt 62, and thereby, the paper P is sandwiched by the first conveyance belt 62 and the second conveyance belt 64 with the face on which the toner image T is formed closely attached to the surface of the second conveyance belt 64 and is cooled by a heat sink 66 through the second conveyance belt 64. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recording material cooling device and an image forming apparatus.

In an electrophotographic image forming apparatus, a fixing device that heats and melts a developer and fixes the developer on a recording material is used. In the fixing device, the temperature of the developer is relatively high even after the developer is heated to the softening point or higher and the recording material is discharged from the fixing device. Therefore, the recording material after the fixing process may be cooled. In Patent Document 1, a belt is placed on a heat roller and a separation roller arranged downstream of the fixing unit, and cooling is performed on the inner side of the belt, downstream of the contact portion between the heat roller and the belt, and upstream of the contact portion between the separation roller and the belt. The second fixing unit is configured to include two sets of belt units each having a means, and the heat rollers and the separation rollers of each unit are pressed against each other via the belt, and the transfer material heated by the first fixing unit is sandwiched between the belts. An image forming apparatus including a fixing device that is cooled in the process of reaching the separation roller is described.
JP 2006-201657 A

  An object of the present invention is to reduce the disturbance of an image in a molten state on a recording material when contacting the belt when the recording material is nipped and conveyed by two conveying belts.

  In order to solve the above-described problem, a recording material cooling apparatus according to claim 1 of the present invention includes a first conveying belt having an endless belt shape that conveys a recording material having an image forming surface on which an image in a molten state is formed. The second endless belt-shaped second belt that transports the recording material, which is placed on the first transport belt and transported over a predetermined distance with the image forming surface in a non-contact state, sandwiched by the first transport belt. It is characterized by comprising a conveying belt and a cooling means for cooling the recording material via the first conveying belt or the second conveying belt.

  According to a second aspect of the present invention, there is provided a recording material cooling apparatus according to the first aspect, wherein the recording material conveyance path on the upstream side of the first conveyance belt is conveyed and the first conveyance. The angle formed by the image forming surface side of the recording material with respect to the recording material conveyance path conveyed by the belt is an obtuse angle.

  According to a third aspect of the present invention, there is provided the recording material cooling apparatus according to the first aspect, wherein the first conveying belt conveys more than the area where the recording material is nipped and conveyed with the second conveying belt. In the upstream of the direction, the circumferential surface of the first transport belt is located at a position lower than the upstream side of the transport direction as it is downstream of the transport direction.

  According to a fourth aspect of the present invention, there is provided the recording material cooling apparatus according to the first aspect, wherein the region where the first conveying belt conveys the recording material is straight. To do.

  According to a fifth aspect of the present invention, in the recording material cooling apparatus according to the first aspect, the first transport belt is wound around a plurality of rolls, and the second transport belt is a plurality of the transport belts. Among the plurality of rolls wound around the first transport belt, the first roll located on the most upstream side in the transport direction of the recording material is wound around the second transport belt. Among the plurality of rolls, the transport direction is more than the second roll that is most upstream in the transport direction in the region where the second transport belt sandwiches and transports the recording material with the first transport belt. It is characterized by being on the upstream side.

  According to a sixth aspect of the present invention, there is provided an image forming apparatus comprising: a rotating image carrier; a charging unit that charges the surface of the image carrier; and a latent image that forms a latent image on the surface of the charged image carrier. Forming means, developing means for developing the latent image formed by the latent image forming means, transfer means for transferring the image developed by the developing means to a recording material, and transfer to the recording material by the transferring means. The image forming apparatus includes: a fixing unit that fixes the recorded image on the recording material by heating; and the above-described recording material cooling device that cools the recording material on which the image is fixed.

  An image forming apparatus according to a seventh aspect of the present invention is the image forming apparatus according to the sixth aspect, wherein the image forming apparatus is provided upstream of the first conveying belt in the conveying direction, and the recording material is transferred to the first conveying belt. An endless belt-like third conveying belt that conveys the recording material, a recording material conveying path conveyed by the third conveying belt, and a recording material conveying path conveyed by the first conveying belt. The angle formed by the image forming surface side of the recording material is an obtuse angle.

According to the recording material cooling device of the first aspect of the present invention, when the belt is sandwiched between the belts, it is less likely that the molten image on the recording material is disturbed when contacting the belt, as compared with the case where both belts sandwich the belt simultaneously. It becomes possible.
According to the recording material cooling device of the second aspect, the recording material can be stably conveyed along the conveyance belt as compared with the case where the two conveyance paths are in a straight line.
According to the recording material cooling device of the third aspect, the recording material can be transported in a stable state by making use of the force received by the weight of the recording material in the transport direction as compared with the case of not having this configuration. It becomes possible.
According to the recording material cooling device of the fourth aspect, the conveyance of the recording material can be further stabilized as compared with the case where the conveyance path is not straight.
According to the recording material cooling device of the fifth aspect, by defining the positional relationship between the plurality of rollers, the image on the recording material is transferred to the belt as compared with the case where the belt is sandwiched by both belts at the same time. It becomes possible to reduce disturbance when contacting.
According to the image forming apparatus of the sixth aspect, it is possible to reduce the disturbance on the image on the recording material when contacting the belt, as compared with the case where the belt is sandwiched between both belts at the same time. According to the image forming apparatus of claim 7, the angle at which the recording material abuts against the first conveyance belt can be stabilized, and the first conveyance belt can be compared with the case where there is no third conveyance belt. It is possible to further stabilize the posture of the recording material when entering the head.

Embodiments of the present invention will be described below with reference to the drawings.
[A. Constitution]

  FIG. 1 is a diagram illustrating a configuration of an image forming apparatus 1 according to the present embodiment. As shown in FIG. 1, the image forming apparatus 1 includes a control unit 11, a sheet storage unit 12, image forming units 13 </ b> Y, 13 </ b> M, 13 </ b> C, and 13 </ b> K, a transfer unit 14, a fixing unit 15, and a cooling device 16. A transport device 17 is provided. Note that the symbols Y, M, C, and K indicate configurations corresponding to yellow, magenta, cyan, and black toners, respectively. The control unit 11 includes a CPU (Central Processing Unit), a memory, and the like, and the CPU controls the entire image forming apparatus 1 by executing a program stored in the memory. The paper storage unit 12 stores paper cut into a predetermined size such as A3 or A4. The sheets stored in the sheet storage unit 12 are taken out one by one in accordance with instructions from the control unit 11 and conveyed to the transfer unit 14 via the sheet conveyance path.

  The image forming units 13Y, 13M, 13C, and 13K as image forming units each include a photosensitive drum, a charging unit, a latent image forming unit, a developing unit, a primary transfer roll, and a cleaning member, and use corresponding toner. Thus, a toner image corresponding to the image data is formed and transferred onto the intermediate transfer belt 41 in an overlapping manner. This image data may be obtained by reading an original image by an image reading device (not shown) or may be generated based on data transmitted from a computer device (not shown). The transfer unit 14 includes an intermediate transfer belt 41, a secondary transfer roll 42, and an opposing roll 43 that faces the secondary transfer roll 42 with the intermediate transfer belt 41 interposed therebetween, and the image forming units 13Y, 13M, and 13C. , 13K, transfer means for transferring the toner image formed on the paper. The intermediate transfer belt 41 is rotated in the direction A in the drawing by a driving roll (not shown). When the toner images are transferred in an overlapping manner by the image forming units 13Y, 13M, 13C, and 13K, the toner images are transferred to the intermediate transfer belt 41. It is conveyed to the position of the next transfer roll 42 and the opposing roll 43. The secondary transfer roll 42 transfers the toner image on the intermediate transfer belt 41 to the paper conveyed from the paper storage unit 12 by the potential difference with the intermediate transfer belt 41.

  The fixing unit 15 includes a heating roll 51 and a pressure roll 52, and applies heat and pressure to the paper conveyed from the secondary transfer roll 42 to fix the toner image on the paper. The heating roll 51 has a heat source such as a halogen lamp inside, and heats the surface of the paper to about 100 degrees. The pressure roll 52 is pressed against the heating roll 51 and applies pressure to the sheet passing between the heating roll 51 and the pressure roll 52. Further, a peeling member 53 made of metal or resin is provided near the surface of the heating roll 51. The paper that has undergone the fixing process by applying heat and pressure by the heating roll 51 and the pressure roll 52 is peeled off from the heating roll 51 by the peeling member 53 and conveyed to the cooling apparatus 16 by the conveying device 17. It has become.

  The transport device 17 is provided upstream of the cooling device 16 in the paper transport direction. The transport device 17 includes transport rolls 71 a and 71 b (hereinafter simply referred to as a transport roll 71 when they are not distinguished from each other) and a transport belt 72, and transports the paper discharged from the fixing unit 15 to the cooling device 16. The conveyance roll 71 is a roll that supports the conveyance belt 72, and at least one of them is rotated by a drive unit (not shown). The conveyance belt 72 is a belt member that is wound around the conveyance roll 71, and carries the sheet peeled from the heating roll 51 by the above-described peeling member 53 and conveys the sheet to the cooling device 16.

  The cooling device 16 is a cooling unit for cooling the paper heated by the fixing unit 15. FIG. 2 is a diagram showing a detailed configuration of the cooling device 16 in this embodiment. As shown in the figure, the cooling device 16 includes a plurality of first transport rolls 61a, 61b, 61c, 61d (hereinafter simply referred to as the first transport roll 61 when not distinguished from each other), a first transport belt 62, A plurality of second transport rolls 63 a, 63 b, 63 c, 63 d, 63 e (hereinafter simply referred to as second transport roll 63 when not distinguished from each other), a second transport belt 64, and a heat sink 66 are provided.

  The plurality of first transport rolls 61 are rolls that support the first transport belt 62. The first conveyor belt 62 is a first endless belt member that is wound around a plurality of first conveyor rolls 61 and moves around in the direction of arrow B in the drawing along with the second conveyor belt 64. The plurality of second transport rolls 63 are rolls that support the second transport belt 64, and at least one of these rolls is rotated by a drive unit (not shown). The second conveyance belt 64 is a second endless belt member that is wound around the plurality of second conveyance rolls 63 and the heat sink 66, and moves around in accordance with the rotation of the second conveyance roll 63. The surface of the second conveyor belt 64 is smooth, and the toner image on the paper that has been in a molten state before coming into contact with the second conveyor belt comes into contact with the second conveyor belt and becomes highly glossy. In addition, as another form, you may drive both a 1st conveyance roll and a 2nd conveyance roll, and you may rotate a 2nd conveyance belt with a 1st conveyance belt conversely. The sheet on which the toner image has been fixed by the fixing unit 15 described above is carried on the conveyance belt 72 (not shown in FIG. 2) of the conveyance device 17 and conveyed in the direction of arrow D, and the leading edge of the sheet is the first edge. It abuts against a portion of the conveyor belt 62 that is wound around the first conveyor roll 61a. Thereafter, the sheet is placed on a portion of the first conveying belt 62 that is stretched from the first conveying roll 61a toward the first conveying roll 61b and conveyed over a predetermined distance, and then the first conveying belt. 62 is sandwiched between the second conveyance belt 64 and conveyed in the conveyance direction C of the paper in the drawing according to the circular movement. Here, the lower the downstream surface in the paper transport direction D, the lower the peripheral surface of the transport belt 72 is, and the lower the upstream surface in the transport direction D, the higher the temperature after fixing and the weaker the paper after cooling. The force due to gravity generated by the weight of the paper is applied in the paper transport direction, and the paper is stably transported. Further, the conveyance direction C of the recording material conveyed while being placed on the first conveyance belt 62 is configured to be closer to the horizontal direction than the conveyance direction D.

Note that the angle (angle θ in the drawing) formed by the image forming surface side of the sheet conveyance path D in the conveyance belt 72 and the sheet conveyance path C in the portion of the first conveyance belt 62 that conveys a predetermined distance is an obtuse angle. In this case, the vicinity of the leading edge of the sheet hits the first conveying belt 62, the conveying force of the conveying belt 72 acts in a direction to press the sheet against the first conveying belt 62, and the sheet follows the conveying belt 72. If the angle is too small even if the angle is obtuse, the impact when the sheet hits the first conveying belt 62 increases, and the shape of the sheet may change or the toner image on the sheet may be disturbed. . On the other hand, even when such an influence is not large, the sheet is not smoothly transferred from the conveying belt 72 to the first conveying belt 62, and the posture of the sheet may change or the conveyance may be delayed. is there. On the other hand, even if the angle is obtuse, if the angle is too large, the paper may not directly pass from the conveyor belt 72 to the first conveyor belt 62 but may directly strike the second conveyor belt 64. When these phenomena occur, in some cases, a part of the paper is bent or deformed, causing paper jam. That is, it is desirable that the angle formed by the image forming surface side of the two transport paths is an appropriate angle, and the angle is preferably 135 degrees to 178 degrees. In this embodiment, this angle is set to 177.3 degrees.
Further, since the conveyance path along which the first conveyance belt 62 conveys the sheet is straight, the posture of the sheet once along the first conveyance belt may be deformed by the first conveyance belt 62. It is suppressed.

  The heat sink 66 is a cooling body that cools the second transport belt 64, and is provided on the inner peripheral side of the second transport belt 64 so as to be in contact with the inner peripheral surface thereof. The heat sink 66 includes a base portion 662 that is in contact with the inner peripheral surface of the second transport belt 64, a large number of fins 661 provided substantially perpendicular to the longitudinal direction of the base portion 662, and a case portion 663 that covers the base portion 662 and the fins 661. And two rotation fins 664 provided in the opening of the image forming apparatus 1 and a motor (not shown) as a drive source for rotating these rotation fins 664. The base 662 and the fins 661 are made of aluminum having good thermal conductivity, the base 662 absorbs heat transmitted from the paper via the second conveying belt 64, and the fins 661 cool the heat. 16 is released into the air. Here, the fin 661 increases the surface area of the heat sink 66 in contact with the air, thereby increasing the efficiency of diffusing the heat absorbed by the base 662 into the air. The heated air in the cooling device 16 is discharged to the outside of the image forming apparatus 1 by the rotating fins 664 that rotate. In this way, the cooling device 16 takes heat from the sheet and cools the sheet.

[B. Operation]
Next, the operation of the image forming apparatus 1 will be described.
First, the toner images formed by the image forming units 13Y, 13M, 13C, and 13K described above are transferred onto a sheet by the transfer unit 14. The sheet on which the toner image has been transferred is conveyed to the fixing unit 15, applied with heat and pressure, and then peeled off from the heating roll 51 by the peeling member 53.

  FIG. 3 is a diagram illustrating how the paper P passes through the cooling device 16. In FIG. 3, the first conveyance rolls 61 c and 61 d and the second conveyance rolls 63 c and 63 d of the cooling device 16, the portion of the first conveyance belt 62 and the portion of the second conveyance belt 64 that are wound around these are omitted. To do. The paper P on which the toner image T has been fixed by the fixing unit 15 is placed on the transport belt 72 of the transport device 17 in a state where the toner image T is on the surface on the second transport belt 64 side, and is transported in the direction of arrow D. . Hereinafter, the surface of the paper on which the toner image is formed is referred to as an image forming surface. In some cases, a toner image may be formed on both sides of the paper. In this case, the surface immediately fixed by the fixing unit, that is, the surface on which the toner image in a more melted state is formed is referred to as an image forming surface. .

  Then, the paper P is abutted against a portion of the first transport belt 62 that is wound around the first transport roll 61a. The first transport roll 61a is a roll on the most upstream side in the transport direction of the paper P among the first transport rolls 61 around which the first transport belt 62 is wound. The paper P whose leading end is abutted against the above-described first conveyance belt 62 is placed on the first conveyance belt 62 and conveyed in a region R1 from the vicinity of the second conveyance roll 63a. The distance from the position where the leading edge of the sheet is abutted to the vicinity of the second transport roll 63a corresponds to the “predetermined distance” described above. In the region R1 corresponding to the predetermined distance, the paper P is once placed on the first transport belt 62, and after the shape and posture of the paper are stabilized, the first transport belt 62 and the second transport belt. 64, the situation in which the toner image is disturbed by entering between the first conveying belt 62 and the second conveying belt 64 while the shape and posture of the sheet are abnormal is suppressed. In addition, since the angle formed between the conveyance path D and the image forming surface side of the conveyance path C is an obtuse angle, the conveyance force of the conveyance belt 72 causes the conveyance of the first conveyance belt 62 after the leading edge of the sheet abuts against the first conveyance belt 62. The paper moves along the conveying belt 72. Further, in these actions, when the sheet after fixing is curled, particularly in the case of down curling, a force acts in a direction to push back the curl on the opposite side to the curled. Further, when the paper P is abutted against the first conveying belt 62, the paper may be bent by the impact, and the image forming surface of the paper may come into contact with any object in the image forming apparatus 1. In particular, the toner image is likely to be disturbed. Even in such a case, according to the above configuration, in the region R1 corresponding to the predetermined distance, the sheet P does not contact any member other than the first conveyance belt 62, and the image forming surface thereof is the image forming apparatus 1. The toner image T formed on the image forming surface is less likely to be disturbed because it is in a non-contact state where it does not contact any of the objects. The region R1 can take various values depending on conditions such as the angle θ, the paper size, or the paper conveyance speed described above, but is 20 to 30 mm in the present embodiment.

  When the leading edge of the paper P passes through the region R <b> 1 and is transported to the contact position between the second transport roll 63 a and the first transport belt 62, the paper P is transported in the second transport by the first transport belt 62. It is pressed against the belt 64 side. At this time, the toner image T is in a melted state by heating the fixing unit 15. Therefore, the sheet P is pressed against the second conveyance belt 64, so that the surface on which the toner image T is formed is in close contact with the surface of the second conveyance belt 64. The sheet P is sandwiched between the first conveyance belt 62 and the second conveyance belt 64 in a state where the surface on which the toner image T is formed is in close contact with the surface of the second conveyance belt 64, and the second conveyance roll 63b. The region R2 up to this position moves in the direction of arrow C in the drawing as the first conveyor belt 62 rotates.

Here, the positional relationship between the first transport roll 61a and the second transport rolls 63a and 63e will be described.
Among the plurality of first transport rolls 61 around which the first transport belt 62 is wound, the first transport roll 61a located on the most upstream side in the sheet transport direction is a plurality of the plurality of first transport rollers 61 that are wound around the second transport belt 64. Among the second transport rolls 63, in the region R2 where the paper is sandwiched and transported by the first transport belt 62, the second transport roll 63 is located upstream of the second transport roll 63a that is the most upstream in the paper transport direction. . Since the first transport roller 61a and the second transport roller 63a are in such a positional relationship, the sheet is placed on the first transport belt 62 and transported over a predetermined distance with the image forming surface in a non-contact state, and thereafter The first conveying belt 62 and the second conveying belt can be nipped and conveyed. The second transport roll 63e is the most upstream roll in the paper transport direction among the second transport rolls 63 around which the second transport belt 64 is wound, but is not in the region R2 described above. Therefore, in the second transport roll 63 around which the second transport belt 64 is wound, the second transport roll 63a transports the paper P with the first transport belt 62 and the second transport belt 64 sandwiched therebetween. In R2, it is the most upstream roll in the transport direction of the paper P.

  When the paper P moves to a position facing the heat sink 66, the paper P is pressed against the second transport belt 64 on the heat sink 66 side by the first transport belt 62 and is brought into close contact with the heat sink 66. 2 Cooled via the conveyor belt 64. The cooled sheet P is transported to the position of the second transport roll 63b on the second transport belt 64, then peeled off from the second transport belt 64, placed on the first transport belt 62, and placed on the first transport roll 61b. It is transported to the position. At this time, the temperature of the paper P is cooled from about 90 degrees when heated by the fixing unit 15 to about 72 degrees, and the toner image T on the paper P is formed on the smooth surface of the second transport belt 64. It solidifies along. Therefore, the toner image T is a glossy image on the paper P that is away from the second transport belt 64. Further, since the conveyance path along which the first conveyance belt 62 conveys the paper is straight, the paper once along the first conveyance belt may be bent during conveyance by the first conveyance belt 62. The curling is suppressed by being conveyed while maintaining the posture. In this way, the paper P cooled by the cooling device 16 is transported to the discharge port through the paper transport path and discharged from the discharge port.

[C. Modified example]
The embodiment described above may be modified as in the following example. Moreover, you may combine these modifications suitably.
(1) In the above-described embodiment, the heat sink 66 is provided along the inner peripheral surface on the inner peripheral side of the second transport belt 64, but the inner periphery on the inner peripheral side of the first transport belt 62. It may be provided along the surface, or may be provided on both the inner peripheral side of the first transport belt 62 and the inner peripheral side of the second transport belt 64. In the embodiment, the heat sink 66 provided with the fins 661 is used as the cooling device 16. However, this may be any device as long as it is a device for cooling a recording material such as paper. May be used. Further, it is sufficient that the recording material can be cooled without providing a cooling body such as the heat sink 66. In this case, for example, it is sufficient that the sufficiently long heat is sufficiently diffused during the nipping and conveying by using the sufficiently long first conveying belt 62 and the second conveying belt 64 to cool the recording material.

(2) In the above-described embodiment, before the first conveyance belt 62 and the second conveyance belt 64 sandwich the sheet P, in the region R1 in which the sheet P is conveyed by a predetermined distance only by the first conveyance belt 62, the first conveyance belt. Although the inclination angle of the peripheral surface 62 with respect to the horizontal direction, that is, the angle formed between the paper transport direction by the first transport belt 62 and the horizontal direction is not particularly mentioned, in this region R1, the first transport belt 62 The circumferential surface may be located at a position lower than the upstream side in the transport direction as the downstream side in the transport direction. Thereby, since the gravity received by the recording material is utilized in the conveying direction, the recording material is conveyed in a stable state.
Further, as shown in FIG. 4, the circumferential surface of the first conveyance belt 62 may be positioned higher on the downstream side in the conveyance direction than on the downstream side in the conveyance direction. Even in such a case, it is sufficient if the sheet P is brought into close contact with the peripheral surface of the first conveying belt 62 by, for example, electrostatic force and is stably conveyed.

(3) In the above-described embodiment, the fixing unit 15 includes the heating roll 51 and the pressure roll 52, but the configuration of the fixing unit 15 is not limited thereto. For example, the fixing unit 15 may include a heating roll 51 and a pressure belt. This pressure belt is composed of a belt member and a pressure pad, and the pressure pad presses the belt member against the heating roll 51 side, whereby pressure is applied to the paper passing between the heating roll 51 and the pressure belt. It is supposed to add.

(4) In the embodiment described above, a sheet cut into a predetermined size such as A3 or A4 is used as the recording material. However, the recording material is not limited to the sheet, and may be a resin sheet.

(5) In the above-described embodiment, the configuration for transporting the recording material in the cooling device 16 includes four first transport rollers 61 and five second transport rollers 63. The number is not limited to this. For example, in region R2 in FIG. 3, the first conveying roll that is biased by the elastic body provided on the inner peripheral side of the first conveying belt 62 and presses the first conveying belt 62 toward the second conveying belt 64 side. 61 may be provided. In this way, the recording material and the second conveying belt 64 are more closely attached, and thus the recording material can be cooled stably and quickly.

(6) In the above-described embodiment, the conveyance device 17 (conveyance unit) that conveys the sheet discharged from the fixing unit 15 to the cooling device 16 is provided. However, the recording material on which the image is fixed by the fixing unit is cooled down. It is not necessary to use such a transport means for transporting to. FIG. 5 is a diagram showing an embodiment of this modification. In this embodiment, there is no conveying means between the fixing unit and the cooling device, and the fixing unit itself is a conveying means for conveying the recording material to the cooling device. The sheet exiting the fixing unit is conveyed obliquely downward toward the cooling device, and the leading end of the sheet contacts the first conveying belt 62. The contacted paper is placed on the first transport belt 62 and transported through the transport path C to the position of the first transport roll 61b, as in the above-described embodiment.

1 is a diagram illustrating a configuration of an image forming apparatus. It is a figure which shows the detailed structure of a cooling device. It is a figure which shows a mode that a paper passes a cooling device. It is a figure which shows the aspect which exists in a position higher than the conveyance direction upstream, so that the surrounding surface of a 1st conveyance belt is a conveyance direction downstream. It is a figure which shows the aspect which does not have a conveyance means between a fixing part and a cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 11 ... Control part, 12 ... Paper accommodating part, 14 ... Transfer part, 15 ... Fixing part, 16 ... Cooling device, 17 ... Conveying device, 41 ... Intermediate transfer belt, 42 ... Secondary transfer roll, 51 ... heating roll, 52 ... pressure roll, 53 ... peeling member, 61, 61a, 61b, 61c, 61d ... first transport roll, 62 ... first transport belt, 63, 63a, 63b, 63c, 63d ... second Conveying roll, 64 ... second conveying belt, 66 ... heat sink, 661 ... fin, 662 ... base, 663 ... case portion, 664 ... rotating fin, 71 ... conveying roll, 72 ... conveying belt, C ... conveying direction, D ... conveying Direction, P ... paper, T ... toner image.

Claims (7)

A first conveying belt in the form of an endless belt that conveys a recording material having an image forming surface on which an image in a molten state is formed;
Endless belt-like second transport for transporting the recording material, which is placed on the first transport belt and transported over a predetermined distance with the image forming surface in a non-contact state, sandwiched and transported by the first transport belt Belt,
And a cooling means for cooling the recording material via the first conveying belt or the second conveying belt. The angle formed by the image forming surface side of the recording material is an obtuse angle between the recording material conveyance path upstream of the conveyance by the first conveyance belt and the recording material conveyance path conveyed by the first conveyance belt. The recording material cooling device according to claim 1, wherein: The upstream of the conveyance direction upstream of the region where the first conveyance belt sandwiches and conveys the recording material with the second conveyance belt, the more the peripheral surface of the first conveyance belt is downstream in the conveyance direction, the conveyance The recording material cooling device according to claim 1, wherein the recording material cooling device is at a position lower than an upstream side in the direction. The recording material cooling apparatus according to claim 1, wherein a region where the first conveying belt conveys the recording material is straight. The first conveyor belt is wound around a plurality of rolls,
The second conveyor belt is wound around a plurality of rolls,
Of the plurality of rolls around which the first transport belt is wound, the first roll located on the most upstream side in the transport direction of the recording material is the plurality of rolls wound around the second transport belt. The second conveying belt is located on the upstream side in the conveying direction with respect to the second roll located on the most upstream side in the conveying direction in an area where the recording material is nipped and conveyed with the first conveying belt. The recording material cooling device according to claim 1. A rotating image carrier;
Charging means for charging the surface of the image carrier;
A latent image forming means for forming a latent image on the surface of the charged image carrier;
Developing means for developing the latent image formed by the latent image forming means;
Transfer means for transferring the image developed by the developing means to a recording material;
Fixing means for fixing the image transferred to the recording material by the transfer means to the recording material by heating;
An image forming apparatus comprising: the recording material cooling device according to claim 1, which cools a recording material on which an image is fixed. Provided on the upstream side in the transport direction of the first transport belt, and includes an endless belt-shaped third transport belt that transports the recording material to the first transport belt;
The angle formed by the image forming surface side of the recording material between the conveying path of the recording material conveyed by the third conveying belt and the conveying path of the recording material conveyed in a state of being placed on the first conveying belt is an obtuse angle. The image forming apparatus according to claim 6, wherein the image forming apparatus is provided.

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