JP2005298109A - Moving medium cooling apparatus and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving medium cooling device for effectively supplying cooling energy to a moving medium.
A cooling roller 20 is a hollow roller and contains a cooling liquid 200 therein and rotates. The cooling liquid 200 has a specific gravity greater than that of air and has magnetism, and is stored below the inside of the cooling roller 20 by gravity. The magnetic field generation unit 24 includes two annular magnets 241 and is arranged around each end of the cooling roller 20 so that the cooling liquid 200 stays inside the cooling roller 20 due to magnetic repulsion. The moving medium 19 conveyed to the rotating cooling roller 20 and the counter roller 25 is conveyed from the back side to the near side. The heat of the moving medium 19 moves to the cooling roller 20 by contact with the cooling roller 20 and is transmitted to the cooling liquid 200 inside the cooling roller 20. As a result, the moving medium 19 is cooled.
[Selection] Figure 2

Description

  The present invention relates to a moving medium cooling apparatus and an image forming apparatus.

  2. Description of the Related Art Conventionally, image forming apparatuses such as copying machines, facsimiles, and printers that employ an electrophotographic recording method have been widely used. A visible image is formed by developing a latent image formed on an image carrier to form a toner image. The visible image is transferred to a moving medium (hereinafter referred to as a sheet) using static electricity, and the transferred image is fixed by applying pressure while heating the sheet.

  The sheet shape immediately after fixing is plastically deformed (curled) due to heating and pressurization during fixing, a change in moisture of the sheet, and the like, and the sheet becomes in a high temperature state. Plastic deformation lowers the quality of the final image, makes it look bad when the sheets are stacked, and requires post-processing such as sorting, stapler, punch, etc. when using the sheets as materials In some cases, labor and a complicated mechanism such as a sheet alignment process are required, resulting in high costs. The high-temperature condition of the sheet increases the temperature inside the machine, causes other equipment failures, and peels off toner that has already been fixed. Deteriorate.

  In order to prevent plastic deformation and high-temperature state of the sheet, thereby reducing the final image quality, poor appearance when the sheets are stacked, and troubles such as increased labor, for example, in a fixing process in an image forming apparatus A moving medium cooling apparatus for cooling a heated sheet has been proposed. Generally, the apparatus for cooling a sheet is roughly classified into a system that contacts the sheet and a system that does not contact the sheet.

  Patent Document 1 proposes a moving medium cooling device that uses a system that contacts a sheet and cools a conveying guide that is directly connected to a Peltier element, which is a heat exchange means, by contacting the moving sheet. In Patent Document 1, in order to increase the amount of heat transfer from the sheet to the conveyance guide, it is necessary to increase the contact area between the sheet and the conveyance guide. If the contact area is increased, the conveyance resistance with respect to the sheet increases and a conveyance jam occurs. Invite.

  Patent Document 2 proposes a moving medium cooling device that uses a method of contacting a sheet and cools the sheet while nipping and conveying the sheet with a conveyance roller having a heat pipe. In Patent Document 2, the portion that comes into contact with the sheet has a roller shape exclusively, and in order to improve thermal efficiency, it is necessary to increase the roller diameter to increase the contact area. If the contact area is increased, the area other than the contact area of the roller Increases and wastes cooling energy.

  Patent Document 3 proposes a moving medium cooling device that uses a non-contact method on a sheet, and forcibly air-cools by blowing an airflow onto the sheet with a fan. Patent Document 4 uses a non-contact method on a sheet, There has been proposed a moving medium cooling device that forcibly corrects curl using an attaching roller and cools the sheet by blowing cold air onto the sheet with air blowing generating means such as a fan. In Patent Literature 3 and Patent Literature 4, when a fan is used, noise due to wind noise is generated.

In Patent Document 5, in order to prevent the magnetic powder toner from leaking out of the container from the bearing portion of the rotating member, NS, S-- A developing device in which magnets are arranged in N rows has been proposed.
Japanese Utility Model Publication No. 5-28657 Japanese Patent Laid-Open No. 10-133440 JP-A-8-171338 Japanese Patent No. 3001727 JP 2003-21968 A

  It is an object of the present invention to provide a moving medium cooling apparatus that effectively supplies cooling energy to a moving medium, and in addition, to provide a moving medium cooling apparatus that suppresses paper jam, noise, and contamination.

  The moving medium cooling apparatus according to the present invention includes a cooling roller, an inflow pipe, an outflow pipe, a magnetic field generating means, a circulation path, and a counter roller. The cooling roller rotates around the inflow pipe and the outflow pipe through bearings provided inside both ends by a hollow roller that contains a magnetic coolant. The inflow pipe guides the cooling liquid from the outside of the cooling roller at one end of the cooling roller, and the outflow pipe guides the cooling liquid from the inside of the cooling roller to the outside at the other end of the cooling roller. The magnetic field generation means generates a magnetic field inside the introduction part of the inflow pipe and the outflow pipe at both ends of the cooling roller, and the circulation path dissipates the heat of the cooling liquid while flowing the cooling liquid from the outflow pipe to the inflow pipe. Let The counter roller is disposed opposite to the cooling roller and rotates while sandwiching the moving medium with the cooling roller while rotating.

  Furthermore, the outer periphery of the inflow pipe and the outflow pipe may be magnetically shielded. Also, the magnetism generating means has two magnets at both ends of the cooling roller, each magnet surrounds the cooling roller in an annular shape, and the polarity arrangement of the two magnets at each end is opposite to each other. . Further, the cooling roller may have a rectifying member, and the rectifying member may be provided on the inner wall of the cooling roller to guide the coolant from the inflow pipe to the outflow pipe. The cooling roller may have a cover, and the cover may be disposed on the liquid level of the cooling liquid in the cooling roller. In addition, a plastic deformation correction roller is provided, and the plastic deformation correction roller may be bent by applying a force in the direction opposite to the traveling direction to the moving medium discharged from between the cooling roller and the counter roller. In addition, a temperature sensor and a flow rate control unit are provided, the temperature sensor measures the temperature of the moving medium sent to the cooling roller, and the flow rate control unit controls the flow rate of the coolant, and the flow rate increases as the temperature increases. The lower the temperature, the lower the flow rate. Further, the image forming apparatus may be configured to include any one of the moving medium cooling devices described above.

  The cooling energy is efficiently transmitted to the moving medium, and there is no leakage of the cooling liquid, so that a moving medium cooling device with energy saving, low noise, and simple structure can be obtained. Furthermore, by having magnetic shields in the inflow pipe and the outflow pipe, it is possible to reduce the transport resistance of the coolant flowing in the circulation path. In addition, by having two magnets having opposite polarities at both ends of the cooling roller, it is possible to more reliably prevent the coolant from leaking out of the cooling roller. By having the rectifying member, the pressure loss of the flow of the cooling liquid is reduced and the cooling liquid can be flowed promptly. Moreover, by having a cover, scattering of a coolant can be suppressed from the beginning. Further, by providing the plastic deformation correcting roller, the plastic deformation of the moving medium can be corrected immediately after cooling, and the handling of the moving medium after cooling becomes easy. Further, by providing the temperature sensor and the flow rate control means, it is possible to perform cooling according to the temperature of the moving medium. Further, there is no leakage of the cooling liquid, and an image forming apparatus including an energy saving, low noise, and simple structure moving medium cooling device can be obtained.

  As shown in the configuration diagram of FIG. 1, the image forming apparatus 1 according to the first embodiment includes an image reading unit 10, a processing unit 11, a paper feeding unit 12, a transfer device 13, a fixing device 14, and a moving medium cooling device 15. A paper discharge unit 16, a reversing unit 17, and an operation unit 18. The original image is read, and the read image is formed on a moving medium such as copy paper and discharged. The image forming apparatus may be another copying apparatus, a facsimile transmission / reception apparatus, a printing apparatus, a copying apparatus composite type image forming apparatus, or the like.

  The image reading unit 10 detects the size of the document placed on the document table by the document size detection device, scans the light while feeding the document by the automatic document feeder, receives the reflected light, and reads the image of each document. Output to the processing unit 11. The processing unit 11 stores the read images in the memory together with the reading order, and sequentially reads the images from the memory to create a writing signal for creating a toner image. The paper feeding unit 12 stores moving media of various paper qualities and sizes and appropriately sends them to the transfer device 13.

  The transfer device 13 receives the input of the writing signal created by the processing unit 10, charges, exposes, and develops the photoconductor provided for each toner color to form a toner image on the surface. A toner image of each toner color is superimposed on the intermediate transfer belt that rotates in conjunction with the image, and is primarily transferred to the transfer medium that is fed from the paper supply unit 12 to be secondarily transferred collectively. The fixing device 14 presses the second-transferred paper while being sandwiched between a fixing roller composed of a heating roller and a pressure roller to fix the toner image on the moving medium.

  The moving medium cooling device 15 cools the moving medium 19 fixed by the fixing device 14. When an image is formed on the back surface, the cooled moving medium 19 is reversed by the reversing unit 17 and sent again to the transfer device 13 to form an image on the back surface, and is sent to the paper discharge unit 16 when the image formation is completed. And discharged to a paper discharge tray or the like. The operation unit 18 inputs a paper type, a paper size, and the like.

  The moving medium cooling device 15 includes a cooling roller 20, an outflow pipe 21, an inflow pipe 22, a circulation path 23, a magnetic field generator 24, a counter roller 25, a motor 26, and a case 27, as shown in the axial sectional view of FIG. With.

  The cooling roller 20 is a hollow roller that accommodates the cooling liquid 200 therein, and is supported by an external case 27 via a bearing 201 provided outside each end portion, and a motor 26, a belt, and the like via a gear 202. And rotate around the outflow pipe 21 and the inflow pipe 22 via a bearing 203 provided inside each end. It is desirable that the heat conductivity of the cooling roller 20 be sufficiently high, and it has been confirmed by preliminary experiments that a sufficient effect can be obtained in actual use if it is 200 W / K · m or more, for example, about 240 W / K · m. Al can be used.

  The cooling liquid 200 has a specific gravity greater than that of air and has magnetism, and is stored below the inside of the cooling roller 20 by gravity. As the coolant 200, it is desirable to use a substance having a high thermal conductivity and a heat capacity. In general, a liquid having a thermal conductivity of one digit or more and a heat capacity of three digits or more is used. The liquid used for the cooling liquid 200 includes, for example, water, hydrocarbon oil, and fluorine oil as a medium, in which ferromagnetic ultrafine particles such as high-concentration magnetite are stably dispersed, and the surface of the magnetic ultrafine particles In addition, there is a magnetic fluid formed of a surfactant that is chemisorbed strongly. As an example, M-300 using water as a medium provided by Sigma High Chemical Co., Ltd., N-304, N-504 using isoparaffin as a medium, A-200, A-300, A using alkylhanutalin as a medium. -400, A-500, P-206, P-306 using poly-α-olefin as a medium, F-210, F-310 using perfluoropolyether as a medium, and the like. By adding an additive such as LLC (Long Life Coolant) or a rust preventive in the cooling water of the automobile to the coolant 200, the life of the flow path and the like can be extended.

  The inflow pipe 22 has a tube shape and is inserted into one end of the cooling roller 20 to guide the coolant 200 from the outside to the inside. The inflow pipe 22 has a tube shape and has a cooling roller. The coolant 20 is inserted into the inside from the other end of the coolant 20 and guides the coolant 200 from the inside of the cooling roller 20 to the outside. The leading ends of the inflow pipe 22 and the outflow pipe 21 are arranged downward so as to be immersed in the cooling liquid 200 accommodated in the cooling roller 20.

  The circulation path 23 connects the outflow pipe 21 to the inflow pipe 22 through a tubular path, and includes a heat radiation portion 231 and a pump 230 in the middle. The pump 230 causes the cooling liquid 200 to flow along the circulation path 23, thereby causing the cooling liquid 200 to flow into the cooling roller 20 from the inflow pipe 22, and the cooling liquid 200 to flow into the cooling roller 20 from the outflow pipe 21. The amount of retention of the coolant 200 inside the cooling roller 20 is kept at a depth that does not spill from the end of the cooling roller 20.

  The heat radiation part 231 provided in the middle of the circulation path 23 radiates the heat of the coolant 200 inside the circulation path 23 to the outside, for example, a perspective view of FIG. 3A, a perspective view of FIG. As shown in the B1-B2 cross-sectional view of FIG. 3C, a comb-shaped channel 232 may be provided to increase the effective area for heat dissipation. Further, as shown in the perspective view of FIG. 4, the heat radiating unit 231 may be disposed under the moving medium 19 stored in the paper feeding unit 12. The temperature of the moving medium 19 is raised by the heat radiated from the heat radiating unit 231 to lower the humidity and avoid the close contact between the moving media 19, so that the moving media 19 are in close contact with each other in a high humidity environment. It is possible to prevent the separation of the sheet from becoming difficult and hindering the conveyance. When the sheet is simply heated and dehumidified, it may not be before image formation. For example, the sheet may be used for the moving medium 19 in a waiting state after image formation on the front surface of the moving medium 19 until image formation on the back surface. Good.

  The magnetic field generator 24 includes two annular magnets 241a and 241b. The annular magnet 241a and the annular magnet 241b have an N pole on the inside and an S pole on the outside, and are arranged around each end of the cooling roller 20. Has been. The annular magnet 241a generates a magnetic force line 28 as shown in the cross-sectional view near the end of the cooling roller 20 in FIG. 5, and the annular magnet 241b generates a magnetic force line 28 symmetrical to the annular magnet 241a. Due to the magnetic repulsive force of the magnetically cooled cooling liquid 200 contained in the cooling liquid 200, the cooling liquid 200 stays inside the cooling roller 20 and prevents the cooling liquid 200 from leaking outside through the end of the cooling roller 20. The annular magnet 241a and the annular magnet 241b may have an S pole on the inside and an N pole on the outside.

  The opposing roller 25 is disposed below and facing the cooling roller 20, and rotates as the moving medium 19 is sandwiched between the rotating cooling roller 20 and the moving medium 19 as shown in the A1-A2 sectional view of FIG. 19 is conveyed.

  The cooling roller 20 and the counter roller 25 rotate in opposite directions. The contact portion between the cooling roller 20 and the moving medium 19 is a heat conduction region having a nip width of several millimeters, and is narrow depending on the hardness and pressing pressure of the cooling roller 20 or the opposing roller 25. The cooling liquid 200 staying inside the cooling roller 20 is reduced to the nip width, so that the energy for flowing the cooling liquid 200 by the pump 230 can be reduced as compared with the case where the cooling liquid 200 is stopped beyond the nip width, and the amount of heat to be radiated can be reduced. Therefore, it is possible to use a heat radiating fin or the like that is cooled by natural convection heat transfer without using a fan that covers a large amount of heat radiated in the heat radiating portion 231.

  The moving medium 19 transported to the rotating cooling roller 20 and the counter roller 25 is sandwiched between the cooling roller 20 and the counter roller 25, from the back side to the front side in FIG. 1, and from the right side to the left side in FIG. It is conveyed to. The heat of the moving medium 19 moves to the cooling roller 20 by contact with the cooling roller 20, is transmitted to the cooling liquid 200 inside the cooling roller 20, and the heat of the cooling liquid 200 flowing by the pump 230 is radiated by the heat radiating unit 231. As a result, the moving medium 19 is cooled, and a series of heat exchange cycles is formed.

  The moving medium cooling device 15 can cool the moving medium 19 by preventing the coolant 200 from leaking outside the cooling roller 20. Further, even when a liquid is used as the cooling liquid 200, it is possible to prevent the cooling liquid 200 from leaking to the outside, so that the moving medium 19 can be cooled with high efficiency by using water or the like having a large heat capacity as the cooling liquid 200.

  In addition, the semicircular sector magnets 242a to 242d as shown in FIG. 7A or 7B are used in the magnetic field generator 24, and one end of the cooling roller 20 is sandwiched between the sector magnet 242a and the sector magnet 242b. The other end of the cooling roller 20 may be sandwiched between the sector magnet 242c and the sector magnet 242d. The N pole and S pole arrangement of the sector magnet 242a and sector magnet 242b or sector magnet 242c and sector magnet 242d may be NSNS from the top as shown in FIG. 7 (a) or SNSN as shown in FIG. 7 (a). In this case, an upward or downward magnetic field is formed at the end of the cooling roller 20 to generate an upward or downward magnetic induction force with respect to the cooling liquid 200 accommodated in the cooling roller 20. It is possible to prevent the cooling liquid 200 from leaking to the outside of the cooling roller 20 by turning the cooling liquid 200 toward the outside of the 20 near the end portion and staying inside.

  Further, a magnetic shield against an external magnetic field such as ferrite may be provided around the outflow pipe 21 and the inflow pipe 22 near both ends of the cooling roller 20. By providing the magnetic shield, the magnetic repulsive force and magnetic induction force generated with respect to the cooling liquid 200 flowing inside the outflow pipe 21 and the inflow pipe 22 by the magnetic field of the magnetic field generation unit 24 near both ends of the cooling roller 20 are reduced. It can suppress and the conveyance load of the cooling fluid 200 by the pump 230 can be made small.

  Further, as shown in the A1-A2 cross-sectional view of FIG. 8A and the B1-B2 cross-sectional view of FIG. 8B, for example, it extends from one end to the other end along the axial direction of the inner wall of the cooling roller 20. The plate-forming rectifying member 212 may be stretched around. As shown in the B1-B2 cross-sectional view of FIG. 8B, the flow of the coolant 200 in the rotational direction of the cooling roller 20 can be suppressed by the rectifying member 212 and can flow without any stagnation in the axial direction. The cooling liquid 200 that has flowed in from the cooling roller 20 and has received the heat of the moving medium 19 through the cooling roller 20 can be quickly discharged from the cooling roller 20 through the outflow pipe 21 and radiated by the heat radiating portion 231, so that the moving medium 19 can be highly efficient. Can be cooled.

  When the coolant 200 is a liquid, the cover 204 may cover the liquid level of the coolant 200 staying inside the cooling roller 20 as shown in the axial sectional view of FIG. By the cover 204, the movement of the coolant 200 that tends to jump out from the inside of the cooling roller 20 can be suppressed from the beginning.

  Further, by providing a heat insulating material on the surface of the facing roller 25, the cooling effect of the moving medium 19 can be further enhanced. When the moving medium 19 is not transported, energy consumption can be suppressed by stopping the motor 26 and the pump 230.

  In addition, when checking or replacing the cooling roller 20 during maintenance, the cooling liquid 200 inside the cooling roller 20 can be completely removed by closing the inflow pipe 22 side and opening the outflow pipe 21 side and leaving it for a certain period of time. The cooling roller 20 can be replaced without leaking the coolant 200.

  The moving medium cooling device 30 included in the image forming apparatus according to the second embodiment includes four annular magnets 243a to 243d in the magnetic field generator 24 as shown in FIG. 10 in the moving medium cooling device 15 according to the first embodiment. And two are provided at each end of the cooling roller 20. The annular magnet 243a and the annular magnet 243d arranged on the outer side in the axial direction of the cooling roller 20 have an N pole on the inner side and the S pole on the outer side, and the annular magnet 243b and the annular magnet 243c arranged on the inner side in the axial direction of the cooling roller 20 Is the S pole and the outside is the N pole. Regardless of the magnetic properties of the coolant 200, the coolant 200 inside the coolant roller 20 can be prevented from jumping out to the outside due to the magnetic repulsive force of the opposite magnetized annular magnets provided at both ends of the coolant roller 20.

  In addition, as shown in FIG. 11, the annular magnet 243 constituting the magnetic field generation unit 24 may be disposed inside the both ends of the cooling roller 20 so as to surround the outflow pipe 21 and the inflow pipe 22. The moving medium cooling device 30 can be reduced in size by providing the magnetic field generator 24 inside the both ends of the cooling roller 20.

  Further, semicircular sector magnets 244a to 244h as shown in FIG. 12 are used for the magnetic field generator 24, and one end of the cooling roller 20 is formed of a group of sector magnets 244a and sector magnets 244b and sector magnets 244c and sector magnets 244d. The other end of the cooling roller 20 may be sandwiched between a group of a sector magnet 244e and a sector magnet 244f and a group of a sector magnet 244g and a sector magnet 244h. The arrangement of the N pole and the S pole may be NSNS or SNSN from above as shown in FIG. The magnetic field generator 24 forms an upward or downward magnetic field in the vicinity of the axial center of the end of the cooling roller 20, and an upward or downward magnetic induction force with respect to the cooling liquid 200 accommodated inside the cooling roller 20. The cooling liquid 200 that goes to the outside of the cooling roller 20 is turned near the end portion and stays inside, and the cooling liquid 200 can be prevented from leaking to the outside of the cooling roller 20. The fan-shaped magnet 244 may be disposed inside the both ends of the cooling roller 20 so as to surround the circulation path 23.

  Further, the magnetic field generator 24 may be provided with the annular magnets 245a to 245d having different polarities along the axial direction of the cooling roller 20 as shown in FIG. A repulsive magnetic field is generated between the annular magnet 245b or 245c on the inner side in the axial direction of the cooling roller 20 and the outer annular magnet 245a or 245d, and the coolant 200 is applied to the annular magnets 245a and 245d on the outer side in the axial direction of the cooling roller 20. Therefore, the coolant 200 can be prevented from leaking outside the cooling roller 20.

  As shown in FIG. 14, the moving medium cooling device 31 included in the image forming apparatus according to the third embodiment is the moving medium cooling device 15 according to the first embodiment or the moving medium cooling device 30 according to the second embodiment. Are provided with a temperature sensor 32 and a flow rate control unit 33. The temperature sensor 32 measures the temperature of the moving medium 19 before contacting the cooling roller 20 and outputs the measured temperature to the flow rate control unit 33. The flow rate control unit 33 stores the relationship between the temperature of the moving medium 19 and the flow rate of the pump 230 in advance as a table, determines the flow rate based on the temperature measured by the temperature sensor 32 and the table, and determines the flow rate of the pump 230. To the determined flow rate. As the temperature measured by the temperature sensor 32 is higher, the flow rate is increased to increase the cooling capacity. The relationship between the tabulated temperature and the flow rate may be changed depending on the paper type, environmental state, image, fixing condition, conveyance speed, and the like. By setting the conditions in detail, an appropriate coolant flow rate can be controlled and the moving medium 19 can be efficiently cooled.

  The moving medium cooling apparatus included in the image forming apparatus according to the fourth embodiment includes the plastic deformation correcting roller 34 in the moving medium cooling apparatus according to the first to third embodiments, and has a convex shape on the cooling roller 20 side. When the moving medium 19 is conveyed, as shown in the sectional view of the vicinity of the cooling roller 20 in FIG. 15, the moving medium 19 has a plastic deformation correcting roller 34 facing the paper discharge side of the cooling roller 20. Elasticity is imparted to the moving medium 19 between the correction roller 34 and a concave shape is provided on the cooling roller 20 side, and the plastic deformation is corrected by applying stiffness. On the other hand, when the moving medium 19 is conveyed with a convex shape toward the cooling roller 20, as shown in FIG. 16, when the moving medium 19 is conveyed with a concave shape toward the cooling roller 20, the counter roller 10 is discharged. A plastic deformation correcting roller 34 is arranged opposite the paper side, and elasticity is applied to the moving medium 19 between the cooling roller 20 and the plastic deformation correcting roller 34 to give the cooling roller 20 a convex shape, and the stiffness is increased. To correct plastic deformation. The plastic deformation correcting roller 34 may be fixed in advance so as to face either the cooling roller 20 or the facing roller 25, or may be adjustable. By immediately correcting the moving medium 19 that has passed through the cooling roller 20, the plastic deformation of the paper can be corrected easily and quickly. Thereby, the moving medium cooling device functions as a plastic deformation correcting device (decurler device).

  As described above, the moving medium cooling device may be arranged to cool the moving medium after fixing, and the moving medium may be cooled at other positions. The moving medium cooling device can be used for cooling moving media after fixing in various image forming apparatuses such as copiers, facsimiles, laser printers, etc., and can also be applied to sheet heating / dehumidifying devices, etc. It can also be applied to. The moving medium is not limited to copy paper, and may be various media that require heating.

1 is a configuration diagram of an image forming apparatus according to a first embodiment. It is sectional drawing of the moving medium cooling device which concerns on 1st Embodiment. It is the perspective view, perspective drawing, and sectional drawing of the thermal radiation part which concern on 1st Embodiment. It is a perspective view of the other thermal radiation part which concerns on 1st Embodiment. It is sectional drawing of the edge part vicinity of the cooling roller which concerns on 1st Embodiment. It is sectional drawing of the moving medium cooling device which concerns on 1st Embodiment. It is a block diagram of the sector magnet which concerns on 1st Embodiment. It is sectional drawing of the cooling roller with the baffle plate which concerns on 1st Embodiment. It is sectional drawing of the cooling roller with a cover concerning a 1st embodiment. It is sectional drawing of the moving medium cooling device which concerns on 2nd Embodiment. It is sectional drawing of the edge part vicinity of the cooling roller which concerns on 2nd Embodiment. It is a block diagram of the sector magnet which concerns on 2nd Embodiment. It is a block diagram of the other magnetic field generation part which concerns on 2nd Embodiment. It is sectional drawing of the moving medium cooling device which concerns on 3rd Embodiment. It is sectional drawing of the cooling roller vicinity which concerns on 4th Embodiment. It is other sectional drawing of the cooling roller vicinity which concerns on 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Image forming apparatus, 10; Image reading part, 11; Processing part, 12: Paper feed part, 13: Transfer apparatus,
14; fixing device, 15; moving medium cooling device, 16; paper discharge unit, 17; reversing unit,
18; operation part, 19; moving medium, 20; cooling roller, 21; outflow pipe, 22; inflow pipe,
23; Circulation path, 24; Magnetic field generator, 25; Opposing roller, 26; Motor, 27; Case,
28; magnetic field lines; 30; moving medium cooling device; 31; moving medium cooling device; 32; temperature sensor;
33; flow rate control unit, 34; plastic deformation correction roller, 200; coolant, 201; bearing,
202; Gear; 203; Bearing; 204; Cover; 212; Rectifying member; 230; Pump;
231; radiator, 232; flow path, 241; annular magnet, 242; sector magnet,
243; annular magnet, 244; sector magnet, 245; annular magnet

Claims (8)

A cooling roller, an inflow pipe, an outflow pipe, a magnetic field generating means, a circulation path, and an opposing roller;
The cooling roller rotates around the inflow pipe and the outflow pipe through bearings provided inside both ends with a hollow roller that contains a magnetic coolant.
The inflow pipe guides the coolant from the outside to the inside of the cooling roller at one end of the cooling roller;
The outflow pipe guides the coolant from the inside of the cooling roller to the outside at the other end of the cooling roller,
The magnetic field generation means generates a magnetic field inside the introduction part of the inflow pipe and the outflow pipe at both ends of the cooling roller,
The circulation path dissipates heat of the cooling liquid in the middle while flowing the cooling liquid from the outflow pipe to the inflow pipe,
The moving roller cooling device, wherein the counter roller is disposed opposite to the cooling roller and rotates to sandwich the moving medium with the cooling roller while rotating.   The moving medium cooling device according to claim 1, wherein outer circumferences of the inflow pipe and the outflow pipe are magnetically shielded. The magnetism generating means has two magnets at both ends of the cooling roller,
3. The moving medium cooling device according to claim 1, wherein each of the magnets surrounds the cooling roller in an annular shape, and the polarity arrangement of the two magnets at each end is opposite to each other. The cooling roller has a flow regulating member;
The moving medium cooling device according to claim 1, wherein the rectifying member is provided on an inner wall of the cooling roller and guides the coolant from the inflow pipe to the outflow pipe. The cooling roller has a cover;
The moving medium cooling device according to claim 1, wherein the cover is disposed on a liquid surface of the cooling liquid in the cooling roller. Equipped with a plastic deformation correction roller,
The moving medium cooling according to any one of claims 1 to 5, wherein the plastic deformation correcting roller bends the moving medium discharged from between the cooling roller and the counter roller by applying a force in a direction opposite to a traveling direction. apparatus. A temperature sensor and a flow rate control means;
The temperature sensor measures the temperature of the moving medium sent to the cooling roller;
The moving medium cooling device according to claim 1, wherein the flow rate control unit controls the flow rate of the coolant, and increases the flow rate as the temperature increases, and decreases the flow rate as the temperature decreases. . An image forming apparatus comprising the moving medium cooling device according to claim 1.

Images