JP2017107005A - Glossiness application device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glossiness application device for improving the quality of a glossy image at double-side printing by cooling the side of a surface to which glossiness has already been applied, even when applying the glossiness to both surfaces of a recording medium.SOLUTION: A glossiness application device 300 includes an endless belt 24 which conveys a recording medium P in the state of being brought into contact with a recording agent on the recording medium P, to apply the glossiness to the recording agent, a heating member 21 which is for heating the endless belt 24 and around which the endless belt 24 is wound, a pressure member 34 which pressurizes the endless belt 24 between the pressure member 34 and the heating member 21, a cooling roller 91 around which the pressure member 34 is wound, a pressure cooling part 13 which supplies a liquid into the cooling roller and cools it, an insertion part which is inserted into the cooling roller 91 and is for supplying the liquid L into the cooling roller, and a discharge port which is for discharging the liquid L from the inside of the cooling roller to the outside. The insertion part has a supply hole for supplying the liquid L inside the insertion part into the cooling roller and the supply hole is arranged on the outer side than the discharge port in an outer diameter direction G.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gloss imparting device and an image forming apparatus having the gloss imparting device.

In order to give gloss to an image formed by an image forming apparatus such as a copying machine, a facsimile machine, or a printer, there is known a gloss applying apparatus provided in the image forming apparatus or separately from the image forming apparatus (for example, Patent Documents). 1-6).
In such a gloss imparting device, the belt has a belt for conveying the recording medium, a heating unit for heating the belt, and a cooling unit for cooling the belt heated by the heating unit, and after the toner on the recording medium is heated, A technique has been proposed in which the surface state of the belt is transferred to a toner and gloss is imparted to an image on a recording medium by closely contacting and cooling.

  In recent years, there has been an increasing demand for a double-sided glossy image that imparts high gloss to both sides of a recording medium using the above-described gloss providing device. In addition to the color toner, there is an increasing demand for an image that imparts high gloss to the entire image by attaching a clear toner to a portion where the color toner is not placed.

  When gloss is imparted to both sides of a recording medium, it is necessary to impart gloss to one side (front surface) and then to reverse the recording medium to impart gloss to the other side (back side). However, when the gloss is imparted to the back surface, the surface temperature rises, so that the toner on the surface melts and the glossiness of the surface may decrease.

  The present invention has been made in view of the above-described problems. Even when gloss is imparted to both sides of a recording medium, the surface side already glossy is cooled to perform duplex printing. It is an object of the present invention to provide a gloss imparting device for improving the quality of glossy images.

  In order to solve the above-described problem, the gloss imparting device according to the present invention includes an endless belt for transporting the recording medium in a state in contact with the recording agent on the recording medium and imparting gloss to the recording agent, A heating member wrapped around the endless belt for heating the endless belt, a pressure member that pressurizes the endless belt between the heating member, and the pressure member A cooling roller, a pressure cooling unit that supplies and cools the liquid into the cooling roller, an insertion unit that is inserted through the cooling roller and supplies the liquid into the cooling roller, and the liquid A discharge port for discharging the liquid from the inside of the cooling roller to the outside, and the insertion portion has a supply hole for supplying the liquid inside the insertion portion to the roller cooling portion. , In the outer diameter direction than the outlet It is disposed on the outer side.

  According to the present invention, even when gloss is imparted to both sides of a recording medium, the quality of a glossy image during double-sided printing is improved by efficiently cooling the side already glossy.

1 is a diagram illustrating an example of the overall configuration of an image forming apparatus and a gloss imparting apparatus according to a first embodiment of the present invention. 1 is a diagram illustrating an example of a configuration of an image forming apparatus according to a first embodiment of the present invention. It is a figure which shows an example of a structure of the glossiness imparting apparatus concerning the 1st Embodiment of this invention. It is a figure which shows an example of a structure of the control part of the glossiness imparting apparatus concerning the 1st Embodiment of this invention. It is a figure which shows an example of a structure of the pressurization cooling part concerning the 1st Embodiment of this invention. It is a figure which shows an example of a function structure of the control part of the glossiness imparting apparatus concerning the 1st Embodiment of this invention. It is a figure showing the relationship between the surface temperature of the pressurization member of the glossiness imparting apparatus concerning the 1st Embodiment of this invention, and glossiness. It is a figure which shows an example of a structure of the pressurization cooling part in the 2nd Embodiment of this invention. It is a figure which shows an example of a structure of the pressurization cooling part in the 3rd Embodiment of this invention. It is a figure which shows an example of the prior art of a structure of a glossiness imparting apparatus. It is a figure which shows the comparative example of a structure of the pressurization cooling part of a glossiness imparting apparatus.

  The gloss applying apparatus 300 according to the first embodiment of the present invention is used by being connected to the image forming apparatus 100 as shown in FIG. Further, the gloss applying device 300 is configured to transmit / receive information to / from the image forming apparatus 100.

As shown in FIG. 2, the image forming apparatus 100 includes an image forming unit 4 having four process units 4 </ b> Y, 4 </ b> C, 4 </ b> M, and 4 </ b> BK that forms an image on a sheet P as a recording medium, and a sheet on the image forming unit 4. And a paper feeding device 3 for supplying P.
The image forming apparatus 100 also includes a reading device 2 as a scanner that reads a document image, and an automatic document feeder 121 that automatically feeds the document to the reading device 2.
The image forming apparatus 100 also includes a transfer unit 126 serving as a transfer unit having an endless intermediate transfer belt 147 serving as a transfer body in a housing 101, and an optical writing unit serving as an exposure unit positioned above the image forming unit 4. An optical scanning device 155.
The image forming apparatus 100 also conveys the paper P and transfers the toner image carried on the intermediate transfer belt 147 to the paper P at the secondary transfer position N that is a nip portion with the intermediate transfer belt 147. It has a transfer conveying means 5 which is a transfer means.
The image forming apparatus 100 also includes an intermediate transfer belt cleaning device 84 that cleans the intermediate transfer belt 147 after the secondary transfer.
The image forming apparatus 100 also includes a registration roller pair 145 that feeds the paper P supplied from the paper feeding device 3 to the secondary transfer position N at a predetermined timing.
The image forming apparatus 100 also has a fixing unit 6 that carries the toner image after passing through the secondary transfer position N and fixes the toner image onto the paper P conveyed by the transfer conveying means 5.
The image forming apparatus 100 also includes a paper discharge unit 7 that discharges the paper P that has passed through the fixing unit 6 and has the toner image fixed thereon.
The image forming apparatus 100 also includes an image forming control unit 93 that is equipped with a CPU, a non-volatile memory, and a volatile memory, and serves as a control unit that controls the operation of each unit.

  The reading device 2 generates RGB image information by optically reading a document conveyed by the automatic document feeder 121 and placed on the contact glass 122. Specifically, the reading device 2 reads RGB image information by shining light on a document and receiving the reflected light with a reading sensor such as a CCD (Charge Coupled Device) or a CIS (Contact Image Sensor). The RGB image information is information representing an image formed on the paper P, and includes the brightness of each color of red (R), green (G), and blue (B).

  The paper feeding device 3 includes a plurality of paper feeding cassettes 332 that store paper P in the housing 101 and a plurality of paper feeding units for transporting the paper P stored in the paper feeding cassette 332 toward the registration roller pair 145. A feed roller 331. The paper feeding device 3 also conveys the paper P from the manual paper feeding device 333 toward the registration roller pair 145 as a manual paper feeding device 333 as a manual paper feeding unit that supplies the paper P from the outside of the housing 101. And a manual feed roller 334.

Each of the process units 4Y, 4C, 4M, and 4BK has drum-shaped photoconductors 40Y, 40C, 40M, and 40BK that are image carriers as rotating bodies that rotate in the B direction, which is counterclockwise in the drawing. Each of the photoreceptors 40Y, 40C, 40M, and 40BK has a photosensitive layer that is a scanned surface of scanning light emitted from the optical scanning device 155 formed on the surface thereof.
The process units 4Y, 4C, 4M, and 4BK also include charging devices 43Y, 43C, 43M, and 43BK, which are provided upstream of the B direction around the photoreceptors 40Y, 40C, 40M, and 40BK, respectively.
The process units 4Y, 4C, 4M, and 4BK also have developing devices 42Y, 42C, 42M, and 42BK as developing units, and primary transfer rollers 475Y, 475C, and 475M as primary transfer units provided in the transfer unit 126, respectively. 475BK.
Each of the process units 4Y, 4C, 4M, and 4BK also includes a potential sensor that is a surface potential sensor serving as a surface potential detection unit that detects the surface potential of the photoreceptors 40Y, 40C, 40M, and 40BK.
The process units 4Y, 4C, 4M, and 4BK form toner images of yellow, cyan, magenta, and black, respectively, by forming latent images on the photoreceptors 40Y, 40C, 40M, and 40BK by the optical scanning device 155. .

  The intermediate transfer belt 147 is formed by dispersing carbon powder for adjusting electric resistance in a polyimide resin with little elongation. The intermediate transfer belt 147 is wound around a driving roller 471 that is driven to rotate in the direction A in FIG. 1 by a driving source, a driven roller 472 that rotates in the same direction as the driving roller 471, and a secondary transfer roller 473. ing.

The transfer conveyance unit 5 includes a secondary transfer counter roller 474 provided to face the secondary transfer roller 473 and a secondary transfer belt 150 wound around the secondary transfer counter roller 474.
In the transfer conveyance unit 5, the secondary transfer belt 150 contacts the intermediate transfer belt 147 at the secondary transfer position N to form a nip portion.
At the secondary transfer position N, the transfer conveying unit 5 sandwiches the intermediate transfer belt 147 with the paper P between the secondary transfer belt 150 and the secondary transfer roller 473 and applies a secondary transfer bias to the intermediate transfer belt 147. The toner image on the surface is transferred to the paper P.
At this time, as the secondary transfer bias, a charge opposite to the electrostatic charge charged on the surface of the intermediate transfer belt 147 is applied.
The secondary transfer belt 150 conveys the paper P after the secondary transfer at the secondary transfer position N to the fixing unit 6.

The fixing unit 6 includes a heating roller 161 having a heat source therein, a fixing belt 164 wound around the heating roller 161, and a fixing roller 162 wound around the fixing belt 164 together with the heating roller 161. The fixing unit 6 also includes a pressure roller 163 that presses against the fixing belt 164 with the fixing roller 162 to form a fixing nip as a fixing portion that is a pressure contact portion. The heating roller 161, the fixing belt 164, and the fixing roller 162 constitute a belt unit in which the fixing belt 164 moves endlessly. The fixing unit 6 passes the paper P carrying the toner image through the fixing nip, thereby fixing the carried toner image on the surface of the transfer paper by the action of heat and pressure.
The heating roller 161 includes an aluminum cylindrical roller, a silicone rubber layer formed on the outer periphery of the cylinder, and a halogen heater as a heat generator disposed inside the cylinder.

  The paper discharge unit 7 includes a pair of paper discharge rollers 171 disposed opposite to each other, and a duplex unit that reverses the front and back of the paper P and conveys it to the registration roller pair 145 in order to form images on both sides of the paper P. 173.

The image formation control unit 93 includes a CPU (Central Processing Unit), a main memory (MEM-P), a north bridge (NB), and a south bridge (SB).
The image formation control unit 93 also includes an AGP (Accelerated Graphics Port) bus, an ASIC (Application Specific Integrated Circuit), and a local memory (MEM-C).
The image formation control unit 93 also includes an HD (Hard Disk), an HDD (Hard Disk Drive), a PCI bus, and a network I / F.

  The CPU processes and calculates data according to a program stored in the main memory, and controls the operation of each unit described above. The main memory serves as a storage area for the image formation control unit 93 and stores programs and data for realizing the functions of the image formation control unit 93. Alternatively, this program may be configured to be provided by being recorded in a computer-readable recording medium such as a CD-ROM, FD, CD-R, DVD, etc. in an installable or executable format file. .

  The local memory (MEM-C) is used as a copy image buffer and a code buffer. The HD is a storage for storing image data, storing font data used for printing, and storing forms. The HDD controls reading or writing of data with respect to the HD according to the control of the CPU. The network I / F transmits / receives information to / from an external device such as an information processing apparatus via a communication network.

The image formation control unit 93 operates as a communication control unit for controlling bidirectional communication with a host device (for example, a personal computer) via a communication network.
The image formation control unit 93 also operates as an image data processing unit that sends image data from the host device to the optical scanning device 155.

  In the image forming apparatus 100 having such a configuration, when copying, a document is set on the automatic document feeder 121 and the start button on the operation panel is pressed. Alternatively, the automatic document feeder 121 is rotated upward to place the document on the contact glass 122, and then the automatic document feeder 121 is rotated downward to close the document and press the document. Press the button. The document set on the automatic document feeder 121 is, for example, a bundle-shaped sheet document, and the document set on the contact glass 122 is, for example, a single-bound document that is bound in a main shape. When the image forming apparatus 100 is used as a printer, an image forming start operation is performed after image data to be formed is selected and input by an external input device such as a PC connected to the image forming apparatus 100.

  When copying is performed and the document is set on the automatic document feeder 121, the document is read by the reading device 2 after the set document is sent onto the contact glass 122. When the document is placed on the contact glass 122, the document is read by the reading device 2 by pressing the start button. When the original is read by the reading device 2, RGB image information corresponding to each color image of yellow, magenta, cyan, and black is generated by the image formation control unit 93 functioning as an image data processing unit.

  Based on the generated RGB image information or the input RGB image information, the image formation control unit 93 functioning as an image data processing unit generates a toner pattern for expressing each color image of yellow, magenta, cyan, and black. Generated.

Using these toner patterns, the image forming unit 4 forms yellow, magenta, cyan, and black images. The process units 4Y, 4M, 4C, and 4BK having the above-described configuration are operated to form yellow, magenta, cyan, and black images on the intermediate transfer belt 147.
At this time, first, in the process units 4Y, 4C, 4M, and 4BK, the photoreceptors 40Y, 40C, 40M, and 40BK are uniformly charged by the charging devices 43Y, 43C, 43M, and 43BK. Thereafter, the optical scanning device 155 scans and exposes the surfaces of the photoreceptors 40Y, 40C, 40M, and 40BK based on the RGB image information, thereby forming a latent image on the surface to be scanned.

  The latent images on the photoconductors 40Y, 40C, 40M, and 40BK are developed with the toners of the respective colors carried on the developing rollers of the developing devices 42Y, 42C, 42M, and 42BK, and are visualized as toner images. The toner images on the photoconductors 40Y, 40C, 40M, and 40BK are sequentially transferred onto the intermediate transfer belt 147 that is rotated counterclockwise by the action of the primary transfer rollers 475Y, 475C, 475M, and 475BK. The image forming operation for each color at this time is shifted in timing from the upstream side toward the downstream side in the moving direction of the intermediate transfer belt 147 so that the toner image is transferred to the same position on the intermediate transfer belt 147. Executed. The surfaces of the photoconductors 40Y, 40C, 40M, and 40BK after the completion of the primary transfer are cleaned by a cleaning device and are prepared for the next image formation. The toner filled in the toner tanks in the developing devices 42Y, 42C, 42M, and 42BK is transferred to the developing devices 42Y, 42C, 42M, and 42BK of the process units 4Y, 4C, 4M, and 4BK according to the conveyance path as necessary. A predetermined amount is replenished.

  The toner images of four colors yellow, magenta, cyan, and black superimposed on the intermediate transfer belt 147 are secondary positions that are opposed to the secondary transfer roller 473 as the intermediate transfer belt 147 rotates in the A direction. Move to the transfer nip N. In the secondary transfer nip N, the secondary transfer roller 473 and the secondary transfer counter roller 474 are secondarily transferred to the paper P, and the full color image is carried on the paper P. At this time, the secondary transfer counter roller 474 is applied with a positive polarity voltage opposite to the negative polarity, which is the normal charging polarity of the toner. A toner image is transferred onto P.

  For the paper P conveyed between the intermediate transfer belt 147 and the secondary transfer counter roller 474, one feed roller 331 of the paper feeding device 3 is selected by pressing the start button, and the corresponding paper feed is performed by this rotation. The paper cassette 332 is fed out and fed. Although the paper feeding device 3 is used here, it may be fed from the manual paper feeding device 333 by being fed by the rotation of the manual paper feeding roller 334. The sheet P is sent out by the registration roller pair 145 at the timing when the front end of the toner image on the intermediate transfer belt 147 faces the secondary transfer counter roller 474 based on the detection signal from the sensor. Such a feed operation is started substantially simultaneously with the document reading operation described above.

  When the toner image of all colors is transferred and carried on the sheet P, the sheet P enters the fixing unit 6 and passes through the fixing nip between the fixing belt 164 and the pressure roller 163, due to the action of heat and pressure. The carried toner image is fixed, and a good color image is formed on the paper P. The fixed paper P that has passed through the fixing unit 6 is discharged to the outside of the image forming apparatus 100 via the paper discharge roller 171 or enters the double-sided unit 173 depending on the position of the switching claw. Prepare for formation.

  The sheet P on which the image is formed is discharged out of the image forming apparatus 100 from the sheet discharge roller 171. The paper P discharged from the paper discharge roller 171 of the image forming apparatus 100 is inserted into the gloss applying device 300.

  On the other hand, the photoreceptors 40Y, 40C, 40M, and 40BK that have undergone the primary transfer are cleaned by removing the transfer residual toner and the like remaining on the photoreceptors 40Y, thereby preparing for the next image formation. The intermediate transfer belt 147 that has finished the secondary transfer is cleaned by removing residual toner remaining on the intermediate transfer belt cleaning device 84 to prepare for the next image formation.

  The gloss imparting apparatus 300 shown in FIG. 3 generates gloss on the image by smoothing the surface of the recording agent attached to the paper P. The paper P here is one on which the image forming apparatus 100 forms an image by attaching toner as a recording agent.

The gloss applying device 300 conveys the paper P in contact with the toner on the paper P and imparts gloss to the endless belt 24 and an endless belt 24 for heating the endless belt 24. And a gloss-imparting heating roll 21 as a heating member around which the belt 24 is wound.
The gloss applying device 300 is opposed to the drive roll 26 for driving the endless belt 24 in the direction D in FIG. 3, the peeling roll 27 for peeling the paper P from the endless belt 24, and the gloss applying heating roll 21. It has a gloss imparting pressure roll 22 arranged.
The gloss applying device 300 includes a tension roll 28 for keeping the tension of the endless belt 24 constant, a guide member 30 for delivering the paper P to the endless belt 24, and the paper P peeled from the endless belt 24. It has the conveyance member 31 for conveying.

The gloss imparting device 300 is a first cooling member that abuts the endless belt 24 along the direction D, which is the moving direction of the endless belt 24, in order to cool the endless belt 24 heated by the gloss imparting heating roll 21. 41, 51, 61.
The gloss imparting device 300 includes a pressure member 34 that is a second endless belt wound around the gloss imparting pressure roll 22, and second cooling for cooling the pressure member 34 when the pressure member 34 is wound around. And a cooling roller 91 as a member.
The gloss applying device 300 includes cooling means 40, 50, and 60 that are cooling systems for cooling the first cooling members 41, 51, and 61, respectively.

  The gloss applying device 300 includes a pressure cooling unit 13 that cools the cooling roller 91 using a cooling liquid L that is a liquid refrigerant.

The gloss imparting device 300 is a paper ejection that ejects the paper P provided on the opposite side of the insertion port 33 in the housing of the gloss imparting device 300 from the insertion port 33 provided in the vicinity of the paper ejection roller 171 of the image forming apparatus 100. And a mouth 32.
The gloss applying device 300 includes a temperature sensor 25 that detects the temperature of the surface of the endless belt 24, and a cooling temperature sensor 66 that detects the temperature of the first cooling member 61.

The gloss applying device 300 includes gloss determining means 86 that determines the presence or absence of gloss on the surface of the paper P that contacts the pressure member 34.
As shown in FIG. 4, the gloss applying device 300 includes a control unit 220 for controlling the operation and function of each member.

As shown in FIG. 3, the endless belt 24 is wound around the gloss imparting heating roll 21, the drive roll 26, the peeling roll 27, and the tension roll 28, and in the vicinity of the insertion port 33 of the gloss imparting apparatus 300. To the vicinity of the paper discharge port 32 so as to be horizontal.
The endless belt 24 is a two-layer belt having a base material formed on the wound inner peripheral surface side and a surface layer formed on the outer peripheral surface side.
The base material is formed of polyimide having a thickness of 80 μm and high heat resistance.
In addition, polyester, polyethylene, polyethylene terephthalate, polyether sulfone, polyether ketone, polysulfone, polyamideimide, polyamide, or the like may be used as the base material. Although the thickness of the base material is 80 μm here, the thickness may be 10 μm or more and 300 μm or less.

The surface layer is formed of a silicone-based resin having a thickness of 1 μm or more and 100 μm or less, and the smoothness of the surface in contact with the paper P is high. The surface layer has high adhesiveness with the toner at the heated portion and stably transports the paper P, but has high releasability from the toner and easily peels off after cooling.
As for the surface roughness of the surface layer on the side in contact with the paper P, the arithmetic average roughness Ra is preferably 0.3 μm or less, and more preferably 0.1 μm or less.
The surface layer may be a surface layer forming material such as a fluororesin.

The endless belt 24 is configured to rotate in the conveyance direction of the paper P, that is, the D direction in FIG. 3 within a speed range of 50 mm / sec to 700 mm / sec by the driving force of the driving roll 26.
The gloss imparting pressure roll 22 is configured to rotate in the direction C in FIG.

The gloss imparting heating roll 21 and the gloss imparting pressure roll 22 are provided in the vicinity of the guide member 30 so as to face each other with the endless belt 24 and the pressure member 34 interposed therebetween, and form a gloss imparting nip portion. ing. The width of the gloss imparting nip is set in the range of 10 mm to 40 mm.
The gloss-imparting heating roll 21 is a cylindrical metal roll made of aluminum having a diameter of 50 mm or more and 120 mm or less, a silicone rubber layer having a thickness of 5 mm or more and 30 mm or less formed on the outer periphery thereof, and a heating device disposed inside. And a halogen heater 23. The surface of the silicone rubber layer may further have a fluororesin tube having a thickness of 30 μm or more and 200 μm or less.

  The gloss imparting pressure roll 22 is a cylindrical metal roll, a silicone rubber layer having a thickness of 5 mm to 30 mm formed on the outer periphery thereof, and a thickness of 30 μm to 200 μm formed on the surface of the silicone rubber layer. And a fluororesin tube.

The temperature sensor 25 detects the temperature of the surface of the endless belt 24 around the gloss imparting heating roll 21.
The cooling temperature sensor 66 is attached to a portion of the surface of the first cooling member 61 that is not in contact with the endless belt 24, and has a function as temperature detection means for detecting the temperature of the first cooling member 61.

  The gloss discriminating means 86 is a gloss discriminating sensor that irradiates one surface of the paper P, in this case, the back surface that is in contact with the pressure member 34 and discriminates the presence or absence of gloss from the reflected light.

The control unit 220 performs on / off control of the halogen heater 23 based on the temperature detected by the temperature sensor 25. The temperature sensor 25 uses a contact type thermistor in this embodiment, but may be a non-contact type thermopile or the like. With this configuration, the surface temperature of the endless belt 24 on the gloss-imparting heating roll 21 is controlled to a temperature higher than the melting point of the toner, for example, in the range of 100 ° C. to 180 ° C.
The gloss imparting heating roll 21 heats the paper P and simultaneously presses the paper P so that the toner surface of the paper P and the smooth surface of the endless belt 24 are in contact with the gloss imparting pressure roll 22. As a result, the toner adhering to the paper P is melted. Here, the material of the metal roll portion of the gloss imparting heating roll 21 is aluminum, but it is not particularly limited to aluminum. However, a metal with good thermal conductivity is preferable from the viewpoint of heating efficiency.

  As shown in FIG. 4, the control unit 220 includes a CPU 211 that controls the operation of the glossing apparatus 300 as a whole, a ROM 212 that stores programs and data for realizing the functions of the control unit 220, and a RAM 213 that is used as a work area for the CPU 211. have. Further, the control unit 220 includes an HD (Hard Disk) 214 that stores various data, and an HDD (Hard Disk Drive) 215 that controls reading or writing of various data with respect to the HD 214 according to the control of the CPU 211. In addition, the control unit 220 includes a network I / F (Interface) 216 for transmitting data using a communication network, and bus lines such as an address bus and a data bus for electrically connecting the above components. 217. The ROM 212 stores a gloss generation processing control program for controlling the gloss applying device 300.

The first cooling members 41, 51, 61 are heated by the glossing heating roll 21 on the downstream side in the D direction and the upstream side of the peeling roll 27 with respect to the contact with the glossing heating roll 21 of the endless belt 24. It is provided for cooling the endless belt 24 and the paper P.
The first cooling members 41, 51, 61 are installed in this order from the upstream side along the rotation direction of the endless belt 24, in other words, the D direction which is the moving direction of the paper P.
The first cooling members 41, 51, 61 are in contact with the inner peripheral surface of the endless belt 24 to cool the endless belt 24, so that the toner image on the sheet P conveyed in close contact with the endless belt 24. Cool down.
The first cooling members 41, 51, 61 are made of aluminum so that a hole for circulating a fluid, specifically, a coolant as a refrigerant, reciprocates inside the first cooling members 41, 51, 61. Formed and connected to the cooling means 40, 50, 60.
The first cooling members 41, 51, and 61 are desirably made of a metal having good thermal conductivity such as aluminum or copper, but are not limited thereto.
In the present embodiment, the three first cooling members 41, 51, and 61 are used. However, the number of the first cooling members 41, 51, and 61 is not necessarily limited as long as the cooling can be sufficiently performed.

In the present embodiment, a plurality of cooling means 40, 50, 60 are provided for cooling a plurality of portions of the endless belt 24 in the D direction, and for cooling the first cooling members 41, 51, 61, respectively. Is provided.
Here, the cooling means 40, 50 and 60 have the same basic configuration, and therefore the cooling means 40 will be described as an example.

  The cooling means 40 includes a flow channel 45 for circulating a coolant for cooling the first cooling member 41, a cooling unit 42 provided in the flow channel 45 for cooling the coolant, and a reservoir for storing the coolant. A tank 43 and a pump 44 for circulating the coolant are provided.

The channel 45 is a hollow tube through which the coolant passes, and connects the cooling unit 42, the tank 43, the pump 44, and the first cooling member 41. Here, the flow path 45 may use a metal pipe or the like having good thermal conductivity in order to efficiently transmit the temperature of the coolant to the first cooling member 41.
The cooling unit 42 is a radiator having a fan for cooling the coolant, and the amount of cooling can be adjusted by changing the air volume of the fan. To cool the toner on the sheet P efficiently, for example, it is desirable that the air volume of the fan can be set in the range of 0 m 3 ^/ min to 11m 3 ^/ min.
The pump 44 can adjust the flow rate of the coolant flowing through the cooling means 40, and it is desirable if it can be adjusted in the range of, for example, 0 liter / minute to 15 liter / minute.
With such a configuration, the cooling liquid cooled by the cooling unit 42 cools the first cooling member 41 while circulating through the flow path 45 by the tank 43 and the pump 44. The coolant heated by the exhaust heat from the endless belt 24 is returned to the cooling unit 42, cooled by the cooling unit 42, and again used for cooling the endless belt 24.
The circulating coolant keeps the temperature of the first cooling member 41 low, and cools the abutting endless belt 24.

  The pressure member 34 is a belt wound around the gloss imparting pressure roll 22 and the cooling roller 91. Other configurations such as the material and thickness of the pressure member 34 are the same as those of the endless belt 24, and thus the description thereof will be omitted as appropriate.

As shown in FIG. 5, the pressure cooling unit 13 is a cooling system for cooling the cooling roller 91 using the cooling liquid L.
5A is a cross-sectional view along the longitudinal direction of the cooling roller 91, and FIG. 5B shows a cross-sectional view along a plane perpendicular to the longitudinal direction of the cooling roller 91.
The pressure cooling unit 13 includes a cavity 131 provided inside the cooling roller 91, a supply pipe 132 serving as a supply path for supplying the coolant L to the cavity 131, and an opening that will be described later from the cavity 131. And a discharge pipe 136 for discharging through 135.
The pressure cooling unit 13 also includes a rotary joint 133 that rotatably supports the cooling roller 91.
Further, the coolant L circulates in the cooling roller 91 in the direction indicated by the F direction in the drawing in order through the supply pipe 132, the cavity 131, the opening 135, and the discharge pipe 136.
The pressure cooling unit 13 has a cooling device 70 for cooling the coolant L upstream of the supply pipe 132 in the F direction and downstream of the discharge pipe 136.

The rotary joint 133 seals the coolant 137 passing through the rotary joint 133 or the discharge pipe 136 and the bearing 137 for rotatably supporting the connecting portion 136 a that is a rotating shaft fixed to the cooling roller 91. And an O-ring 138 as a sealing member.
The rotary joint 133 is sealed with an O-ring 138 while supporting one end of the connecting portion 136a with a bearing 137, thereby preventing leakage of the coolant L caused by the rotation of the cooling roller 91.
The rotary joint 133 is a rotary joint that stably supports the cooling roller 91 in such a configuration.

The discharge pipe 136 is a hollow pipe connected to the hollow portion 131 via the rotary joint 133 and the connection portion 136a.
The connecting portion 136 a has an opening 135 that serves as a discharge port for connecting the cavity 131 and the cooling device 70 and discharging the coolant L from the cavity 131.

The cooling roller 91 cools the pressure member 34 by contacting the inner peripheral surface side of the pressure member 34.
The cooling roller 91 is wound around the region of 180 ° on the lower half side along the E direction, which is the rotation direction of the pressure member 34, and the portion around which the pressure member 34 is wound, in other words, the pressure member 34. It has a contact range W which is a contact region.

  The cavity 131 is a cavity provided inside the cooling roller 91, and cools the cooling roller 91 by being filled with the cooling liquid L. The cavity 131 is connected to the flow path of the coolant L formed by the supply pipe 132 and the flow path of the coolant L formed by the discharge pipe 136.

The supply pipe 132 is a hollow pipe partially pierced, that is, inserted through one end of the cooling roller 91 and connected to the opening 135 to form the opening. In other words, the supply pipe 132 has the insertion part 132a.
The insertion portion 132a includes a diameter changing portion 132b that protrudes outward from the opening 135, that is, the outer side in the G direction as the outer diameter direction when the cooling roller 91 is viewed in a cross section perpendicular to the rotation axis. And three supply holes 134 arranged in the portion 132b.
That is, the diameter changing portion 132 b is a portion that is a part of the insertion portion 132 a and protrudes toward the inner wall of the cooling roller 91.

The supply holes 134 are arranged at three locations along the direction E on the surface of the diameter changing portion 132b facing the contact range W, and discharge the cooling liquid L toward the inner wall surface of the cooling roller 91.
The supply pipe 132 supplies the coolant L from the supply hole 134 disposed in the diameter changing portion 132b to the cavity portion 131 along the flow direction shown in the F direction.

  Thus, the supply pipe 132, the discharge pipe 136, and the rotary joint 133 form a flow path for connecting the cavity 131 and the cooling device 70 to circulate the coolant L.

The cooling device 70 has a radiator 72 for cooling the coolant L and a pump 74 for circulating the coolant L.
The cooling device 70 is disposed inside the casing 310 of the gloss imparting device 300, cools the cooling liquid L, and is connected to the discharge pipe 136 and the supply pipe 132. Circulates along the F direction.

According to the configuration as described above, the toner adhering to the paper P while being in close contact with the endless belt 24 is cooled and cured, whereby the surface state of the endless belt 24 is transferred to the toner, and the peeling roll It peels in 27.
In the present embodiment, the cooling is performed more efficiently by combining three cooling units in which the first cooling member 41 and the cooling means 40 are combined and contacting the endless belt 24. Although FIG. 3 shows a configuration in which three are arranged side by side in particular, the number of the three is not necessarily limited as long as it is in a range that meets the purpose of sufficiently cooling.
For example, the first cooling members 41, 51, 61 may be cooled by the cooling means 40 as one large first cooling member 41 without being divided.

  The peeling roll 27 is provided in the vicinity of the paper discharge port 32 and is cooled by the first cooling members 41, 51, 61 to peel the paper P after the toner is cured from the endless belt 24 by the curvature.

  The drive roll 26 is provided in the vicinity of the insertion port 33 so as to bridge the endless belt 24, and the endless belt 24 of the horizontally provided portion is directed from the insertion port 33 toward the paper discharge port 32. It is rotated by a drive source to move. A paper discharge tray for storing the discharged paper P may be provided outside the paper discharge port 32.

When the paper P conveyed by the endless belt 24 moves along the peeling roll 27, the curvature of the endless belt 24 increases at a position where the peeling roll 27 is located.
Accordingly, the paper P conveyed by the endless belt 24 is separated from the endless belt 24 and conveyed by the conveying member 31 in the vicinity of the position of the peeling roll 27.

  As illustrated in FIG. 6, the control unit 220 includes a conveyance control unit 221, a heating control unit 222, a pressurization control unit 223, and a cooling control unit 224. Each of these units is a function or means realized by operating according to a command from the CPU 211 in accordance with a program stored in the ROM 212 shown in FIG.

  The conveyance control unit 221 controls and rotates the driving roll 26 to move the endless belt 24 in the D direction. The heating control unit 222 controls the gloss imparting heating roll 21 to have a predetermined temperature by causing the halogen heater 23 to generate heat. The pressurization control unit 223 controls the pressurization time of the paper P by controlling the rotation speeds of the gloss imparting pressure roll 22 and the gloss imparting heating roll 21.

The cooling control unit 224 controls the cooling units 42, 52, 62 and the pumps 44, 54, 64, etc., and adjusts the cooling amount to cool the paper P to a desired temperature.
The cooling control unit 224 is cooling control means for controlling the pressure cooling unit 13 and the cooling device 70 to control the flow rate of the coolant L to cool the pressure member 34.
The cooling control unit 224 controls the flow rate of the cooling liquid L to be in an OFF state in which the flow rate of the cooling liquid L is set to 0 when gloss is imparted to only one side of the paper P, and otherwise. Control is performed so that a predetermined amount set in advance is ON.
Alternatively, the cooling control unit 224 switches between the above-described ON state and OFF state according to whether or not gloss is imparted to the surface of the paper P that contacts the pressure member 34 detected by the gloss determination unit 86.

  The cooling control unit 224 also increases the flow rate of the coolant L when the transport speed of the endless belt 24 is fast, for example, and decreases the flow rate of the coolant L when the transport speed of the endless belt 24 is slow. As a result, the surface temperature of the pressure member 34 is controlled. Alternatively, the cooling control unit 224 controls the surface temperature of the pressure member 34 by controlling the number of rotations of the fan of the radiator 72 to increase or decrease the temperature of the cooling liquid L.

The gloss imparting operation of the gloss imparting apparatus 300 having such a configuration will be described.
When the paper P is inserted, the gloss applying device 300 performs a process of generating a gloss on the image formed on the paper P. Details of this processing will be described with reference to FIG. The gloss imparting device 300 receives the paper P discharged from the paper ejection roller 171 of the image forming apparatus 100 from the insertion port 33 of the gloss imparting device 300 as described above. Thus, the recording surface of the paper P to which the toner is attached is placed so as to be in contact with the smooth surface of the endless belt 24.

When the sheet P is received and placed so that the recording surface of the sheet P to which toner is attached is in contact with the smooth surface of the endless belt 24, the endless belt 24 conveys the sheet P according to the control of the conveyance control unit 221. . The endless belt 24 transports the paper P in the D direction by moving from the insertion port 33 to the paper discharge port 32 at a speed of 50 mm / sec to 700 mm / sec by the driving force of the driving roll 26. When the leading edge of the paper P reaches the position of the glossing nip portion formed by the pressure member 34 and the gloss imparting heating roll 21, the pressure member 34 and the gloss imparting heating roll 21 sandwich the paper P and pressurize it. At this time, the halogen heater 23 as a heat generator generates heat under the control of the heating control unit 222, and the surface temperature of the endless belt 24 in the portion measured by the temperature sensor 25 is controlled and maintained at 150 ° C. The sheet P is heated to 100 ° C. or more and 120 ° C. or less by passing through the gloss imparting nip portion, and the toner on the surface is softened and melted.
When the toner that forms the image formed on the paper P is in contact with the surface layer of the endless belt 24 while being softened and melted, the surface of the toner (hereinafter referred to as the toner surface) becomes smooth. By the heating and pressurization, the smoothness of the surface layer of the endless belt 24 is transferred to the toner surface and becomes smooth.

  After the paper P is heated and pressed by the pressure member 34 and the gloss imparting heating roll 21, the first cooling members 41, 51, 61 controlled by the cooling control unit 224 feed the paper P through the endless belt 24. Cool to below 40 ° C. The toner fixed on the surface of the paper P by being cooled is cured in a state where the smooth surface of the endless belt 24 is transferred, and is stably held in a state where the surface is smooth.

  Finally, the paper P is separated from the endless belt 24 at the position of the peeling roll 27, and gloss is imparted to the toner surface.

When the paper P is separated from the endless belt 24, it is placed on the conveying member 31. The transport member 31 on which the paper P is placed moves in the direction of the paper discharge port 32 and transports the paper P. When the paper P reaches the paper discharge port 32, it is discharged out of the gloss applying device 300. The discharged paper P is accommodated in a paper discharge tray.
The glossiness of the image thus obtained was a value of 65 to 80 in terms of a 20 ° glossiness.

The gloss imparting device 300 described above imparts gloss only to the front surface (surface) Ps where the paper P contacts the endless belt 24. In the following description, the surface to which the gloss is given first is the front surface Ps, and the surface to which the gloss is later given is the back surface Pr.
In order to give gloss to both sides of the paper P on which images are formed on both sides, the paper P is conveyed from the conveying member 31 to the recording material reversing means 36 by using the switching claw 35 which is the conveying destination changing means, and the paper P is reversed and the back surface is reversed. Is passed through the gloss imparting nip portion again in contact with the endless belt 24.

  By reversing the paper P and passing through the gloss imparting nip portion again, the toner image formed on the back surface Pr side also softens and melts in the gloss imparting nip portion, and the surface of the endless belt 24 The state is transferred to the back surface Pr.

At this time, heat and pressure are again applied to the surface Ps by the pressure member 34 that forms the gloss imparting nip portion. In the conventional structure as shown in FIG. 10, the pressure member 34 is easily heated by the gloss-imparting heating roll 21, and when the surface temperature of the pressure member 34 is a certain level or more, the toner is softened again and the glossiness is lowered. There is a fear.
In order to prevent such remelting of the toner, it is important to cool the pressure member 34 and maintain the surface temperature of the pressure member 34 below a predetermined temperature.
As shown in FIG. 7, the surface temperature of the pressure member 34 is desirably maintained at 80 ° C. or lower in order to prevent a decrease in the glossiness of the image due to remelting of the toner.

However, as shown in FIG. 10 described as an example of the prior art, when the gloss imparting nip portion is formed using only the gloss imparting pressure roll 22 and the gloss imparting heating roll 21, the gloss imparting process is performed. The pressure roll 22 rises to the same temperature as the gloss imparting nip.
The gloss-imparting pressure roll 22 is generally configured such that an elastic body such as rubber is disposed on a cylindrical metal member. Since the heat capacity is large, a surface temperature of 80 ° C. or less is provided by providing a cooling fan or the like. Is difficult to maintain.

  Further, when the gloss imparting pressure roll 22 side is to be cooled by a cooling fan or the like, an air flow may occur in the gloss imparting device, which may hinder the conveyance of the paper P. Cooling is preferably performed by means that do not cause disturbance.

Alternatively, a configuration in which a cooling member that abuts against the pressurizing member 34 is separately attached is conceivable. However, in this method, there is a concern about an increase in the number of parts, and the wider the abutting portion, the higher the cooling effect. There is a concern that the length of will increase.
Further, simply cooling the roller around which the pressure member 34 is wound from the inside does not smoothly circulate the cooling liquid, or the circulating speed becomes faster than the thermal diffusion speed, and a cooling effect is obtained. There is also a concern that it will not be possible.
For example, as shown in FIG. 11 as a comparative example, when the supply hole 134 is located inside the opening 135 in the outer diameter direction, the cooling liquid L has a flow in the F direction. There is a possibility that the coolant L does not smoothly reach the inner wall surface. In other words, there is a possibility that the liquid L is discharged from the opening 135 faster than the heat exchange with the inner wall surface of the cooling roller 91.

Therefore, as already described, the gloss applying device 300 includes the cooling roller 91 and the pressure cooling unit 13 that cools the inside of the cooling roller 91 using the cooling liquid L.
Further, the gloss imparting device 300 includes an insertion portion 132a that is inserted into the cooling roller 91, and a supply hole 134 that is provided in the insertion portion 132a and is disposed outside the opening 135 in the G direction.
With this configuration, cooling is performed on the entire surface of the contact range W between the pressure member 34 and the cooling roller 91, and the cooling liquid L flows into the cavity 131 from a position close to the inner wall surface of the cooling roller 91. High circulation and smooth circulation.

Further, in the present embodiment, the supply hole 134 is disposed in the diameter changing portion 132 b that protrudes toward the inner wall surface of the cooling roller 91.
With this configuration, the coolant L flows into the cavity 131 from a position close to the inner wall surface of the cooling roller 91, so that the cooling efficiency is high and the circulation is performed smoothly.

In the present embodiment, the supply hole 134 is formed on a surface facing the contact range W between the pressure member 34 of the diameter changing portion 132 b and the cooling roller 91.
With this configuration, the cooling liquid L flows into the cavity 131 from a position close to the contact range W of the cooling roller 91, so that the cooling efficiency is high and the circulation is performed smoothly.

Further, the pressure cooling unit 13 has a rotary joint 133.
With such a configuration, the pressure cooling unit 13 prevents the leakage of the cooling liquid L caused by the rotation of the cooling roller 91, and thus more efficiently maintains the surface temperature of the pressure member 34 at 80 ° C. or less. In addition, with this configuration, the gloss applying device 300 gives gloss to the back surface Pr without damaging the gloss of the front surface Ps even when images are formed on both surfaces of the paper P.

In addition, the gloss application device 300 includes a cooling control unit 224 that controls the flow rate of the cooling liquid L in the cavity 131.
With this configuration, the cooling control unit 224 adjusts the cooling amount, so that the surface temperature of the pressure member 34 is more efficiently maintained at 80 ° C. or lower. For example, the cooling control unit 224 increases the cooling amount of the cooling liquid L when the rotating speed of the endless belt 24 is high, and suppresses an increase in the surface temperature of the pressure member 34.

Further, the gloss applying device 300 includes gloss determining means 86 that determines whether or not the surface of the paper P that contacts the pressure member 34 is glossy.
With this configuration, even when gloss is imparted to both sides of the paper P, the presence or absence of gloss on the surface Ps is determined, and the cooling control unit 224 changes the flow rate of the cooling liquid L, thereby impairing the gloss on the surface Ps. Without giving gloss to the back surface Pr, a high-quality gloss image can be obtained.

In the present embodiment, the cooling device 70 that cools the cooling roller 91 is provided independently of the cooling means 40, 50, 60, but the first cooling member 61 may be cooled together with the cooling roller 91.
With this configuration, even when images are formed on both sides of the paper P, a high-quality gloss image can be obtained by imparting gloss to the back surface Pr without impairing the gloss of the front surface Ps, and the cost of the cooling device can be reduced. Can be saved.

  Further, the cavity 131 may be connected to any one of the cooling means 40, 50, 60 to cool any one of the first cooling members 41, 51, 61 together with the cavity 131. With this configuration, the gloss imparting device 300 imparts gloss to the back surface Pr without impairing the gloss of the front surface Ps even when images are formed on both surfaces of the paper P without newly providing a cooling device. High-quality glossy images.

A second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
As shown in FIG. 8, the supply pipe 132 has an insertion part 132a inserted through the cooling roller 91 and a diameter changing part 132b formed at a part of the insertion part 132a.
The diameter changing portion 132b has a plurality of downstream supply holes 134b as supply holes formed on the upstream side in the F direction of the supply pipe 132 and on the downstream side in the F direction of the hollow portion 131, that is, on the discharge pipe 136 side. .
The diameter changing portion 132b also has a plurality of upstream supply holes 134c formed downstream of the supply pipe 132 in the F direction and upstream of the hollow portion 131 in the F direction, that is, on the opposite side of the discharge pipe 136. .

Here, the number of the downstream supply holes 134b is configured to be smaller than the number of the upstream supply holes 134c. That is, the aperture ratio around the unit length of the diameter changing portion 132b along the F direction in the cavity 131 is lower on the downstream side in the F direction than on the upstream side in the F direction.
Accordingly, the flow rate of the coolant L passing through the downstream supply hole 134b is smaller than the flow rate of the coolant L passing through the upstream supply hole 134c.
With this configuration, since the coolant L flows more in the cavity 131 to the supply side than to the discharge side, heat exchange from the coolant L to the cooling roller 91 is performed efficiently.

Further, in the third embodiment of the present invention, as shown in FIG. 9, the diameter changing portions 132b are formed at equal intervals along the F direction, and a plurality of supply holes 134d having different diameters are provided. Have.
Here, the diameter of the supply hole 134d is adjusted so that the opening ratio around the unit length of the insertion portion 132d along the F direction in the hollow portion 131 is larger on the upstream side in the F direction than on the downstream side in the F direction. Has been.
That is, the diameter _{r 1} of the supply hole 134d formed in the F direction upstream side of the insertion portion 132d is formed to be smaller than the diameter _{r 2} of the supply hole 134d formed in the direction F downstream portion of the insertion portion 132d Is done.
With this configuration, since the coolant L flows more in the cavity 131 to the supply side than to the discharge side, heat exchange from the coolant L to the cooling roller 91 is performed efficiently.

In the second and third embodiments shown in FIGS. 8 and 9, the number of supply holes 134b, 134c, and 134d in the circumferential direction E is one, but the supply holes 134b, 134c, and 134d are A plurality may be arranged in the direction.
With this configuration, even when the supply amount of the coolant L is increased, the cooling is stably and efficiently performed.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and the present invention described in the claims is not specifically limited by the above description. Various modifications and changes are possible within the scope of the above.

  For example, in the above embodiment, the image forming apparatus 100 and the gloss applying apparatus 300 may be provided close to each other as shown in FIG. Alternatively, a conveyance belt or the like for conveying the paper P is provided between the paper discharge roller 171 of the image forming apparatus 100 and the insertion port 33 of the gloss applying apparatus 300, and the image forming apparatus 100 and the gloss applying apparatus 300 are placed at positions separated from each other. May be. In the above embodiment, the image forming apparatus 100 and the gloss providing apparatus 300 are described as separate apparatuses. However, the functions of these apparatuses may be included in a single apparatus.

  In the above-described embodiment, the image forming apparatus 100 forms an image using C, M, Y, and K toners. However, the C, M, Y, and K toners are used. In addition, special toners such as clear toner and white toner may be used.

  In the above embodiment, the image forming apparatus 100 forms an image using C, M, Y, and K toners as a recording agent. However, if the glossiness is improved by melting, Not only toner but also ink or the like may be used as a recording agent.

  Further, a cooling member that abuts on the outer peripheral surface of the cooling roller 91 may be used as the roller cooling unit unless the distance between the cooling roller 91 and the gloss imparting pressure roll 22 is excessively widened.

  In the above embodiment, the image forming apparatus 100 describes a process of forming an image based on RGB image information. However, the image forming apparatus 100 may form an image based on image information representing a monochrome image.

Moreover, although the cooling device which comprises the cooling means 40, 50, 60 was made into the water cooling type which uses cooling water and a radiator in this embodiment, you may use another refrigerant | coolant.
Moreover, although the cooling device 70 was described so as to be different from the cooling means 40, 50, 60, for example, any one of the cooling means 40, 50, 60 may be used as the cooling device.

In addition, the second embodiment and the third embodiment may be combined to reduce the diameter of the upstream supply hole and reduce the number thereof so as to reduce the aperture ratio.
Further, in the third embodiment, the size of each supply hole may be increased stepwise from the upstream side in the F direction toward the downstream side, and the supply hole is divided into an upstream side and a downstream side. You may comprise so that the thing arrange | positioned upstream may be small, and the thing arrange | positioned downstream may be enlarged.

In the first to third embodiments described above, since the direction in which the coolant flows in the insertion portion and the direction in which the cavity discharges the coolant are reversed, the F direction upstream side in the insertion portion. Is downstream in the F direction in the cavity.
However, the direction in which the coolant flows in the insertion portion and the direction in which the cavity discharges the coolant L may be the same.
In that case, it is desirable to design the size and number of supply holes by defining upstream and downstream with reference to the direction in which the cavity 131 discharges the coolant L.

  The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

13 Pressure Cooling Unit 21 Heating Member (Glossing Heating Roll)
24 endless belt 25 temperature detector 34 pressure member 40 cooling means 41 first cooling member 42 cooling unit 43 tank 44 pump 45 channel 50 cooling unit 51 first cooling member 52 cooling unit 53 tank 54 pump 55 channel 60 cooling Means 61 First cooling member 62 Cooling section 63 Tank 64 Pump 65 Flow path 66 Temperature detection means (cooling temperature sensor)
70 Cooling device 86 Gloss determining means 91 Cooling roller 100 Image forming device 131 Inside cooling roller (cavity)
132 Supply pipe 132a Insertion part 132b Shape change part 135 Discharge port (opening part)
136 Discharge pipe 133 Rotary joint 134, 134b, 134c, 134d Supply hole 300 Gloss imparting device D Endless belt moving direction E Rotating direction F Liquid circulation direction G Outer diameter direction W The pressure member and the cooling roller come into contact with each other Range L Liquid (Coolant)
P Recording medium Ps Front surface of recording medium Pr Back surface of recording medium

JP 2013-007807 A JP 2014-182184 A Japanese Patent No. 5241155 JP 2004-325934 A JP 2013-007801 A JP 2014-209168 A

Claims (7)

An endless belt for conveying the recording medium in contact with the recording agent on the recording medium and imparting gloss to the recording agent;
A heating member wound around the endless belt for heating the endless belt;
A pressurizing member that pressurizes the endless belt with the heating member;
A cooling roller around which the pressure member is wound;
A pressure cooling unit for supplying and cooling the liquid into the cooling roller;
An insertion part inserted through the cooling roller to supply the liquid into the cooling roller;
A discharge port for discharging the liquid from the inside of the cooling roller to the outside,
The insertion portion has a supply hole for supplying the liquid inside the insertion portion into the cooling roller, and the supply hole is arranged on the outer side in the outer diameter direction than the discharge port. . The gloss imparting apparatus according to claim 1,
The insertion portion has a diameter changing portion protruding toward the inner wall of the cooling roller,
The gloss applying apparatus, wherein the supply hole is disposed in the diameter changing portion. The gloss imparting apparatus according to claim 1 or 2,
A gloss imparting apparatus comprising a plurality of the supply holes. The gloss imparting apparatus according to any one of claims 1 to 3,
The gloss applying device, wherein the supply hole is disposed on a surface of the insertion portion that is opposed to a range where the cooling roller and the pressure member are in contact with each other. In the gloss imparting device according to any one of claims 1 to 4,
The gloss applying device, wherein the pressure cooling unit includes a rotary joint. In the gloss imparting device according to any one of claims 1 to 5,
The gloss applying device, wherein the inflow amount of the liquid supplied from the supply hole is controlled to increase as the distance from the discharge port increases.   An image forming apparatus comprising the gloss applying device according to claim 1.

Images