JP2021128294A - Fixing device, image forming apparatus, and program - Google Patents

Abstract

To reduce the downtime of an image forming apparatus by facilitating paper removal work when winding of paper around a cleaning member occurs.SOLUTION: A fixing device comprises: a cleaning roller that is in pressure contact with a fixing belt of a fixing device F1 that fixes, to paper, an unfixed toner image formed on the paper to clean and remove dirt adhered to the belt; a second rotation mechanism 195 that freely changes the direction of rotation of the cleaning roller; and a control unit 10 that, in response to detection of paper jam, when the temperature of the cleaning member is equal to or higher than a predetermined temperature, controls the second rotation mechanism 195 to rotate the cleaning roller opposite to the direction of rotation during printing.SELECTED DRAWING: Figure 2

Description

The present invention relates to a fixing device, an image forming device and a program.

Conventionally, printers that form electrophotographic images on paper, which is a recording medium, and image forming devices such as MFPs (Multifunction Peripherals) are known. As an electrophotographic image forming apparatus, a fixing device (fixing unit) having a fixing member for fixing a toner image on paper and a cleaning device (cleaning unit) having a cleaning member for cleaning and removing stains adhering to the surface of the fixing member. ), And those with.

When the paper is wrapped around the cleaning member, it is very difficult and time-consuming to remove the paper, which prolongs the downtime of the image forming apparatus. In addition, the wrapped paper may rub the surface of the fixing member and cause scratches, resulting in poor image quality.

In connection with this, after the JAM (jam: paper jam) processing in the fixing device or after the printing processing is completed, the cleaning roller is rotationally driven in a state of being separated from the fixing belt, and the cleaning roller is cleaned by the web. , A fixing device and an image forming device that can improve the cleaning efficiency of the cleaning roller by the web without transmitting the pressing force on the cleaning roller by the web to the fixing belt and damaging the fixing member are known (see Patent Document 1). ).

JP-A-2019-164291

However, the image forming apparatus of Patent Document 1 cleans the cleaning roller when JAM is generated and the process of returning the image forming apparatus is executed after the JAM processing. Therefore, when JAM is generated and the toner cools and hardens while the paper is wound around the cleaning roller, the cleaning member, the paper, and the paper adhere to each other, and the paper removal work (JAM processing) becomes very difficult and takes time. As a result, the problem that the downtime of the image forming apparatus is prolonged and the fixing member is rubbed against the paper and is scratched during the paper removing operation has not been solved.

An object of the present invention is to reduce the downtime of the image forming apparatus by facilitating the work of removing the paper when the paper is wrapped around the cleaning member.

In order to solve the above problems, the fixing device of the invention according to claim 1 is used.
A fixing device that fixes an unfixed toner image formed on paper to the paper.
A fixing member that heats and pressurizes the paper, and
A cleaning member that is pressed against the fixing member to clean and remove dirt that has adhered to the fixing member.
A rotation mechanism that freely changes the rotation direction of the cleaning member,
Reverse rotation processing that controls the rotation mechanism to reverse the rotation direction of the cleaning member with respect to the rotation direction at the time of printing when the temperature of the cleaning member is equal to or higher than a predetermined temperature in response to jam detection of the paper. With the control means to execute
To be equipped.

The invention according to claim 2 is the fixing device according to claim 1.
The rotation mechanism rotationally drives the cleaning member.

The invention according to claim 3 is the fixing device according to claim 1.
The rotation mechanism directly or indirectly rotates the fixing member and causes the fixing member to rotate directly or indirectly.
The cleaning member is driven by the rotation of the fixing member.

The invention according to claim 4 is the fixing device according to claim 3.
A pressure member that presses against the fixing member to form a nip portion,
A first moving mechanism for pressing or separating the pressure member from the fixing member is provided.
The control means rotates the fixing member in the reverse direction with respect to the rotation direction at the time of printing in a state where the pressing member is pressed against the fixing member in response to the jam detection of the paper.

The invention according to claim 5 is the fixing device according to claim 3 or 4.
A torque detecting means for detecting the driving torque of the fixing member is provided.
The control means stops the reverse rotation of the fixing member when the driving torque of the fixing member detected by the torque detecting means is equal to or higher than a predetermined value.

The invention according to claim 6 is the fixing device according to claim 1.
The rotation mechanism
A first rotation mechanism capable of freely switching the rotation speed of the fixing member, and
A second rotation mechanism capable of freely switching the rotation speed of the cleaning member is provided.
The control means controls the rotation mechanism in response to the jam detection of the paper to rotate the rotation direction in the opposite direction to the rotation direction at the time of printing so that the rotation speeds of the cleaning member and the fixing member are the same. Let me.

The invention according to claim 7 is the fixing device according to any one of claims 1 to 6.
The control means controls the rotation mechanism to reverse-rotate the cleaning member at a speed slower than that at the time of printing, and stops the cleaning member after a predetermined time has elapsed.

The invention according to claim 8 is the fixing device according to any one of claims 1 to 7.
The control means executes the reverse rotation process in response to jam detection of the paper in the fixing device.

The invention according to claim 9 is the fixing device according to any one of claims 1 to 8.
A second moving mechanism for pressing or separating the cleaning member from the fixing member is provided.
The control means controls the second moving mechanism to separate the cleaning member from the fixing member in response to the jam detection of the paper.

The invention according to claim 10 is the fixing device according to any one of claims 1 to 9.
A temperature detecting means for detecting the temperature of the cleaning member is provided.
When the temperature of the cleaning member detected by the temperature detecting means is equal to or higher than a predetermined temperature, the control means executes the reverse rotation process.

The invention according to claim 11 is the fixing device according to any one of claims 1 to 9.
The control means determines whether or not the temperature of the cleaning member is equal to or higher than a predetermined temperature based on the elapsed time from jam detection.

The invention according to claim 12 is the fixing device according to claim 10 or 11.
An adjusting means for adjusting the temperature of the cleaning member is provided.
The control means controls the adjusting means to adjust the temperature of the cleaning member to be equal to or higher than a predetermined temperature.

The invention according to claim 13 is the fixing device according to claim 12.
The control means ends the temperature adjustment of the cleaning member in response to the reverse rotation stop of the cleaning member.

The invention according to claim 14 is the fixing device according to any one of claims 1 to 13.
Equipped with an acquisition means to acquire paper size information
The control means determines the time for rotating the cleaning member in the reverse direction based on the paper size information acquired by the acquisition means.

The invention according to claim 15 is the fixing device according to any one of claims 1 to 14.
A wrapping detecting means for detecting that the paper is wrapped around the cleaning member is provided.
The control means executes the reverse rotation process when the wrapping detecting means detects that the paper is wrapped.

The image forming apparatus of the invention according to claim 16 is
The fixing device according to any one of claims 1 to 15.
An image forming portion for forming an image on the paper is provided.

The program of the invention according to claim 17
A fixing member that heats and pressurizes the paper, a cleaning member that cleans and removes dirt adhering to the fixing member by pressure contact, and a rotation mechanism that freely changes the rotation direction of the cleaning member, and is formed on the paper. The computer of the fixing device that fixes the unfixed toner image on the paper,
As a control means for controlling the rotation mechanism to reverse the rotation direction of the cleaning member with respect to the rotation direction at the time of printing when the temperature of the cleaning member is equal to or higher than a predetermined temperature in response to jam detection of the paper. Make it work.

According to the present invention, the downtime of the image forming apparatus can be shortened by facilitating the work of removing the paper when the paper is wrapped around the cleaning member.

It is a figure which shows the schematic structure of the image forming apparatus of embodiment of this invention. It is a block diagram which shows the main functional composition of an image forming apparatus. It is a schematic diagram which shows the structure of the fixing part of embodiment. (A) is a schematic view showing the second rotation mechanism of the cleaning part of embodiment, and (b) is the schematic view which shows the 1st rotation mechanism of a fixing part. (A) is a diagram showing a fixing portion at the time of printing of the embodiment, and (b) is a diagram in which the cleaning member after the occurrence of JAM of the embodiment is separated and the cleaning member and the fixing member rotate in the reverse direction. (C) is a diagram in which the cleaning member after JAM generation of the embodiment is pressed against each other, and the cleaning member and the fixing member rotate in the reverse direction. It is a flowchart which shows the 1st JAM time processing of embodiment. It is a flowchart which shows the 2nd JAM time processing of embodiment.

Embodiments and modifications according to the present invention will be described in detail in order with reference to the accompanying drawings. The present invention is not limited to the illustrated examples.

(Embodiment)
An embodiment according to the present invention will be described with reference to FIGS. 1 to 7. First, the entire apparatus configuration of the image forming apparatus 1 of the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a schematic configuration of the image forming apparatus 1 of the present embodiment. FIG. 2 is a block diagram showing a main functional configuration of the image forming apparatus 1.

The image forming apparatus 1 of the present embodiment will be described as being a color electrophotographic MFP, but is not limited to this, and includes monochrome electrophotographic MFPs, electrophotographic printers, and the like. It may be another image forming apparatus.

As shown in FIGS. 1 and 2, the image forming apparatus 1 includes a control unit 10, a storage unit 11, an operation unit 12, a display unit 13, a communication unit 14, an image reading unit 15, and an image processing unit 16 as control means. It includes an image forming unit 17, a fixing unit 18, a paper feeding unit 20, a paper conveying unit 21, a JAM detecting unit 22, and the like. The control unit 10 has a storage unit 11, an operation unit 12, a display unit 13, a communication unit 14, an image reading unit 15, an image processing unit 16, an image forming unit 17, a fixing unit 18, and a paper feeding unit 20 via a bus 23. , Is connected to the paper transport unit 21 and the JAM detection unit 22.

The control unit 10 has a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, and a ROM (Read Only Memory) 103, and the CPU reads a program stored in the ROM 103 or the storage unit 11 and the RAM 102. In cooperation with the CPU and the program expanded in the RAM 102, various processes are performed. The RAM 102 provides a working memory space (work area) and stores temporary data. The ROM 103 stores various control programs and setting data executed by the CPU. Instead of the ROM 103, a rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or a flash memory may be used.

Further, the ROM 103 of the control unit 10 stores a print program for performing the print processing, a first JAM time processing program for performing the first JAM time processing described later, and the like.

The storage unit 11 is composed of storage means such as DRAM (Dynamic Random Access Memory) and HDD (Hard Disk Drive), which are semiconductor memories, and the image data acquired by the image reading unit 15 and external via the communication unit 14. Data such as image data input from the device is stored.

The operation unit 12 includes input devices such as an operation key and a touch panel arranged so as to be superimposed on the screen of the display unit 13, receives operation input from the user for these input devices, and outputs an operation signal corresponding to the operation input. It is converted and output to the control unit 10.

The display unit 13 has a display panel such as an LCD (Liquid crystal display) or an EL (Electro Luminescece) display, and displays various display information such as an operation screen under the control of the control unit 10.

The communication unit 14 is composed of a NIC (Network Interface Card) or the like, and transmits / receives data to / from an external device such as an external PC (Personal Computer) or another image forming apparatus.

The image reading unit 15 is composed of an ADF (Auto document Feeder), a platen glass, an image sensor, and the like, and under the control of the control unit 10, reads an image of a document, and R (red), G (green), and B (blue). Image data including monochromatic image data for each color component of is generated and stored in the storage unit 11. Further, in the control unit 10, the image data in the bitmap format generated via the communication unit 14 or the image reading unit 15 has pixel values of three colors of R (red), G (green), and B (blue). If it is present, it is converted into image data having pixel values of four colors of Y, M, C, and K, and then stored by the storage unit 11.

The image processing unit 16 has, for example, a rasterization processing unit, a color conversion unit, a gradation correction unit, a halftone processing unit, and the like, and under the control of the control unit 10, various image processing is performed on the image data stored in the storage unit 11. Is applied and stored in the storage unit 11.

The image forming unit 17 forms an image (toner image) on paper based on the image data stored in the storage unit 11 under the control of the control unit 10. The image forming unit 17 includes four sets of charging units 170, an exposure unit 171 and a photoconductor drum 172, which correspond to the color components of Y (yellow), M (magenta), C (cyan), and K (black), respectively, and developed. A unit 173, a cleaning unit 174, a transfer body 175, and a secondary transfer roller 176 are provided.

The charging unit 170 charges the photoconductor drum 172. The exposure unit 171 has a light emitting element such as an LD (Laser Diode), drives the light emitting element based on the image data, and irradiates and exposes the photoconductor drum 172 charged by the charging unit 170 with a laser beam. An electrostatic latent image is formed on the photoconductor drum 172. The photoconductor drum 172 is a rotating conductive cylinder. The developing unit 173 supplies toner (coloring material) of a predetermined color (any of Y, M, C, and K) by a developing roller charged on the exposed photoconductor drum 172, and is placed on the photoconductor drum 172. The electrostatic latent image formed in is developed.

An image (monochromatic image) formed of Y, M, C, and K toners on each of the four photoconductor drums 172 corresponding to Y, M, C, and K is formed from each photoconductor drum 172 onto the transfer body 175. They are sequentially stacked and transferred. As a result, a color image having Y, M, C and K as color components is formed on the transfer body 175. The transfer body 175 is an endless belt wound around a plurality of transfer body transfer rollers, and rotates according to the rotation of each transfer body transfer roller.

The secondary transfer roller 176 transfers the color image on the transfer body 175 onto the paper fed from the paper feed tray 201 or an external paper feed device. Specifically, the transfer body 175 is formed by pressing and contacting a pair of secondary transfer rollers 176 to sandwich the paper and the transfer body 175, and applying a predetermined transfer voltage to the secondary transfer roller 176. The toner forming the color image above is attracted to the paper side and transferred to the paper.

The fixing unit 18 heats and pressurizes the paper on which the toner is transferred to perform a fixing process for fixing the toner on the paper. Here, the fixing portion 18 will be described in more detail with reference to FIG. FIG. 3 is a schematic view showing the configuration of the fixing portion 18.

As shown in FIG. 3, the fixing portion 18 is crimped to the fixing roller 181 via the fixing roller 181 and the heating roller 182, the fixing belt 183 stretched on the fixing roller 181 and the heating roller 182, and the fixing belt 183. The pressure roller 184, the first rotating mechanism 185, the first moving mechanism 186, and the cleaning unit 19 are provided. The fixing belt 183 functions as a fixing member. The pressure roller 184 functions as a pressure member. Further, as shown in FIG. 2, the control unit 10 and the fixing unit 18 function as the fixing device F1.

The fixing roller 181 is crimped to the pressure roller 184 via the fixing belt 183, and is driven (driven rotation) around the shaft 181a as the pressure roller 184 rotates. It should be noted that, instead of the pressure roller 184, the heating roller 182 interlocked by the tension of the fixing belt 183 is driven and rotated by a rotation driving unit such as a motor (not shown) under the control of the control unit 10, and the fixing roller 181 is rotated. It may be driven and rotated together with the fixing belt 183. Further, the fixing roller 181 may be independently driven and rotated by a rotation driving unit such as a motor (not shown) under the control of the control unit 10.

The fixing roller 181 has a structure in which an elastic layer made of silicone rubber or the like is formed on the outer peripheral surface of a columnar core metal made of iron or the like. The specific configuration of the fixing roller 181 can be, for example, a silicone rubber having an outer diameter of φ90 mm, an elastic layer on the outer peripheral surface having a thickness of 20 mm, and an Askar C hardness of 35 °, but is not limited thereto.

The heating roller 182 has a structure in which a resin layer made of PFTE or the like is formed on the outer peripheral surface of a core metal synthesized of aluminum or the like. Inside the core metal, a first heater 182a and a shaft 182b extending in the direction of the rotation axis are provided. The first heater 182a generates heat when energized under the control of the control unit 10, and heats the fixing belt 183 via the core metal and the resin layer of the heating roller 182. Further, the heating roller 182 stretches the fixing belt 183 together with the fixing roller 181 to apply tension to the fixing belt 183.

The fixing belt 183 is an endless belt member that is stretched between the fixing roller 181 and the heating roller 182 and rotates in the direction B in the drawing. The fixing roller 181 and the pressure roller 184 form a first nip portion NP1 as a pressure contacting portion that sandwiches and conveys the paper via the fixing belt 183.

The fixing belt 183 has a structure in which an elastic layer made of silicone rubber and a surface release layer made of a fluororesin are sequentially laminated on the outer peripheral surface of a film base material made of, for example, heat-resistant polyimide. The fluororesin contains, or preferably mainly comprises any of PFA (perfluoroalkoxy alkane), PTFE (polytetrafluoroethylene), and FEP (fluorinated ethylene / propylene hexafluorinated copolymer). Will be done. As a result, the surface releasability of the fixing belt 183 with respect to the wax contained in the toner resin and the toner particles is improved, and the adhesion of the toner and the wax to the fixing belt 183 at the time of fixing is suppressed. The specific configuration of the fixing belt 183 is, for example, a polyimide having an outer diameter of φ168 mm, a film base material having a thickness of 70 μm, a silicone rubber having an elastic layer having a thickness of 400 μm, a surface release layer being a PFA tube, and a belt tension being a fixing roller. 100N can be imparted to each of 181 and the heating roller 182 to give a total of 200N, but the present invention is not limited to this.

A load is applied to the pressure roller 184 in a direction approaching the fixing roller 181 by the load applying mechanism 184b. The load applying mechanism 184b presses the pressure roller 184 against the fixing roller 181 via the fixing belt 183 by, for example, pushing up the shaft 184a of the pressure roller 184 in the upward direction in the drawing. As a result, the pressure roller 184 is independently driven and rotated by the first rotation mechanism 185 under the control of the control unit 10 while forming the first nip portion NP1 with the fixing roller 181. Further, the pressure roller 184 can be moved to a position where it is in pressure contact with the fixing roller 181 and a position where it is separated from the fixing roller 181 by the first movement mechanism 186.

The pressure roller 184 has a structure in which an elastic layer made of silicone rubber or the like is formed on the outer peripheral surface of a columnar core metal made of iron or the like, and a surface release layer made of a fluororesin is formed on the surface thereof. .. The specific configuration of the pressure roller 184 can be, for example, an outer diameter of φ80 mm, an elastic layer on the outer peripheral surface of 10 mm, a surface release layer of a PFA tube, and an AskarC hardness of 30 °. Not limited to.

The fixing roller 181 and the pressure roller 184 sandwich the paper P between the first nip portions NP1 and heat and pressurize the paper P while transporting the paper P in the transport direction shown by A in the drawing to melt the toner on the paper P. And fix it. The first heater 182a heats the heating roller 182 via the heating roller 182 so that the temperature of the fixing belt 183 is, for example, in the range of 180 ° C. or higher and 200 ° C. or lower. Further, the fixing load applied to the first nip portion NP1 can be, for example, 2500N.
The first rotation mechanism 185 is composed of a motor, gears, and the like shown in FIG. 4B, and can freely switch the rotation direction and rotation speed of the fixing roller 181.
The first moving mechanism 186 is composed of a motor, a gear, or the like (not shown), and the pressure roller 184 can be pressure-welded or separated from the fixing belt 183.
The torque detection unit 187 detects the driving torque of the fixing member (fixing roller 181).

The cleaning unit 19 is a temperature detecting means for detecting the temperature of the cleaning roller 191 and the pressing roller (web backup roller) 192, the winding unit 193, the cleaning web 194, the second rotating mechanism 195, the second moving mechanism 196, and the cleaning roller 191. It has a temperature sensor 197, an optical sensor 198 as a winding detection means for detecting that paper is wound around the cleaning roller 191 and the like. The cleaning unit 19 transfers stains W such as wax and paper stains adhering to the surface of the fixing belt 183 to the cleaning roller 191 and further transfers the stains W on the cleaning roller 191 with a cleaning web 194 made of a flame-retardant non-woven fabric. By wiping it off, it has a function of cleaning and removing dirt on the surface of the fixing belt 183.

The cleaning roller 191 functions as a cleaning member. Further, as shown in FIG. 2, the cleaning unit 19 and the control unit 10 function as the cleaning device C1.

The cleaning roller 191 is a roller having a structure in which an elastic layer made of silicone rubber or the like is formed on the outer peripheral surface of a columnar core metal made of iron or the like. Inside the core metal, there is a second heater 191a extending in the direction of the rotation axis and a shaft 191b. The temperature of the cleaning roller 191 is controlled by the control unit 10 based on the temperature detected by the temperature sensor 197. The second heater 191a generates heat when energized under the control of the control unit 10, and heats the dirt on the surface of the fixing belt 183 via the core metal and the elastic layer. Further, the second heater 191a may press-contact the heating member to the outer periphery of the cleaning roller 191 instead of the inside of the cleaning roller 191. Further, the cleaning roller 191 can be moved to a position where it is in pressure contact with the fixing roller 181 and a position where it is separated from the fixing roller 181 by the second moving mechanism 196.

The cleaning roller 191 is pressed against the surface of the fixing belt 183 by a spring, a cam, etc., which is an urging member 1961 of the second moving mechanism 196, to form a second nip portion NP2, and is formed by a second rotating mechanism 195 such as a motor. It is driven independently and rotates in the direction of C in the figure. Since the cleaning roller 191 is configured to have a lower releasability than the fixing belt 183 having a surface releasing layer, dirt W adhering to the surface of the fixing belt 183 between the cleaning roller 191 and the second nip portion NP2. Can be transferred to the surface of the cleaning roller 191.

Further, the cleaning roller 191 is arranged on the downstream side of the first nip portion NP1 of the fixing member (fixing belt 183) and at a position corresponding to the fixing roller 181. Since the cleaning roller 191 is arranged on the downstream side of the first nip portion NP1, dirt on the fixing belt 183 can be reliably cleaned. Since the cleaning roller 191 is arranged at a position corresponding to the fixing roller 181, the cleaning roller 191 is supported by the fixing roller 181 and the surface of the cleaning roller 191 and the surface of the fixing belt 183 are more closely adhered to each other. The cleaning effect is higher.

The pressing roller 192 is a roller that presses the cleaning web 194 against the surface of the cleaning roller 191. The pressing roller 192 is urged in a direction approaching the cleaning roller 191 by an urging means (not shown), and a third nip portion is provided between the pressing roller 192 and the cleaning roller 191. Form NP3. The urging means for urging the pressing roller 192 is controlled by the urging force under the control of the control unit 10, whereby the amount of pressing of the cleaning web 194 against the cleaning roller 191 is controlled.

The take-up portion 193 includes a delivery shaft portion 193a and a take-up shaft portion 193b. Assuming that the feed direction of the cleaning web 194 is the direction D in the drawing, that is, the direction in which the cleaning roller 191 and the cleaning web 194 travel in the same direction as the forward direction, the feed shaft portion 193a is wound on the upstream side in the positive direction. The shaft portion 193b is arranged on the downstream side in the positive direction. The delivery shaft portion 193a and the take-up shaft portion 193b are core metal portions of the cleaning web 194.

The take-up portion 193 winds up the cleaning web 194 by rotating the feed-out shaft portion 193a and the take-up shaft portion 193b in synchronization, and slides the cleaning web 194 on the surface of the cleaning roller 191 at the third nip portion NP3. Rub. The delivery shaft portion 193a and the take-up shaft portion 193b are connected to motors (not shown), respectively, and the motors are controlled by the control unit 10, so that the rotation amounts of the delivery shaft portion 193a and the take-up shaft portion 193b are controlled. ..

The cleaning web 194 is a long sheet made of a flame-retardant non-woven fabric made of heat-resistant polyester fiber, aramid fiber, or the like, and both ends in the longitudinal direction are attached to a feeding shaft portion 193a and a winding shaft portion 193b, respectively. It is wound in advance around the delivery shaft portion 193a. By controlling the rotation of the delivery shaft portion 193a and the take-up shaft portion 193b, the cleaning web 194 delivered from the delivery shaft portion 193a is wound around the take-up shaft portion 193b, and the cleaning roller 192 is used by the pressing roller 192 at the third nip portion NP3. Pressed against the surface of 191. When the cleaning roller 191 rotates, the cleaning web 194 rubs the surface of the cleaning roller 191 at the third nip portion NP3 that comes into contact with the cleaning roller 191 to wipe off the dirt W. That is, the cleaning web 194 indirectly contacts the fixing belt 183 via the cleaning roller 191 and wipes off the dirt W on the surface of the fixing belt 183.

Here, the driving means of the cleaning unit 19 and the pressure roller 184 will be described with reference to FIG. FIG. 4A is a schematic view showing the driving means of the cleaning unit 19. FIG. 4B is a schematic view showing the driving means of the pressure roller 184.

In the present embodiment, the cleaning unit 19 has a second rotation mechanism 195 capable of rotating the cleaning roller 191 in the reverse direction. Further, the fixing portion 18 has a first rotation mechanism 185 capable of reversely rotating the fixing roller 181 in both the case where the fixing roller 181 is driven by the pressure roller 184 and the case where the fixing roller 181 is independently rotated.

As shown in FIG. 4A, the second rotation mechanism 195 includes drive transmission gears 1951 and 1952 and a motor 1953. The motor 1953 rotates and drives the cleaning roller 191 under the control of the control unit 10. The drive transmission gear 1951 is a gear connected to the cleaning roller 191 with the axis of the rotating shaft 191b of the cleaning roller 191 in common. The drive transmission gear 1952 is a gear that meshes with the drive transmission gear 1951 and is connected to the motor 1953 with the axis of the motor shaft 1953a of the motor 1953 in common. In the cleaning unit 19, the rotational driving force of the motor 1953 is transmitted to the cleaning roller 191 via the drive transmission gears 1952 and 1951, and the cleaning roller 191 is rotationally driven. The motor 1953 is composed of a brushless motor, a stepping motor (pulse motor), a DC motor, and the like.

As shown in FIG. 4B, the first rotation mechanism includes drive transmission gears 1851, 1852 and a motor 1853. The motor 1853 rotates and drives the pressure roller 184 under the control of the control unit 10. The drive transmission gear 1851 is a gear connected to the pressurizing roller 184 with the axis of the rotating shaft 184a of the pressurizing roller 184 in common. The drive transmission gear 1852 is a gear that meshes with the drive transmission gear 1851 and is connected to the motor 1853 with the axis of the motor shaft 1853a of the motor 1853 in common. In the fixing portion 18, the rotational driving force of the motor 1853 is transmitted to the pressure roller 184 via the drive transmission gears 1852 and 1851, and the pressure roller 184 is rotationally driven. The motor 1853 is composed of a brushless motor, a stepping motor (pulse motor), a DC motor, and the like.

In this way, in order to facilitate the work of removing the paper when the paper is wrapped around the cleaning member, the cleaning roller 191 is rotated in the reverse direction by the drive transmission gears 1951 and 1952 and the motor 1953, and the drive transmission gear 1851, The 1852 and the motor 1853 allow the pressurizing roller 184 to rotate in the reverse direction.

Here, the second moving mechanism 196 will be described with reference to FIGS. 2 and 5.
The second moving mechanism 196 is a mechanism for pressing or separating the cleaning roller 191 from the fixing belt 183, and the cleaning roller 191 is moved to the shaft 191b according to the control of the control unit 10, for example, by the driving force of the motor. Move in parallel.
Further, the second moving mechanism 196 includes an urging member 1961 such as a spring and a cam, and the pressing force of the cleaning roller 191 against the fixing belt 183 is adjusted by the urging member 1961.

Returning to FIGS. 1 and 2, the paper feed unit 20 has, for example, a plurality of paper feed trays 201 for storing paper of various sizes or paper types, and is supplied with the specified type of paper under the control of the control unit 10. It is taken out from the paper tray 201 and conveyed to the secondary transfer roller 176 of the image forming unit 17.

The paper transport unit 21 includes a plurality of paper transport rollers for transporting paper by rotating while sandwiching the paper, and transports the paper in a predetermined transport path under the control of the control unit 10. The paper transport unit 21 includes a reversing mechanism 211 that reverses the front and back sides of the paper that has been fixed by the fixing unit 18 and transports the paper to the secondary transfer roller 176. In the image forming apparatus 1, when an image is formed on both sides of the paper, the front and back sides of the paper are inverted by the reversing mechanism 211 to form an image on both sides, and then the paper is ejected to the paper ejection tray 24. When the image is formed on only one side of the paper, the paper on which the image is formed on one side is ejected to the paper ejection tray 24 without the front and back sides of the paper being reversed by the reversing mechanism 211.

The JAM detection unit 22 is composed of an optical sensor for detecting paper and a mechanical sensor (for example, an actuator), and detects JAM of paper being conveyed in the image forming apparatus 1. For example, the JAM detection unit 22 detects the tip of the paper with the first sensor at a predetermined position, and then even after the first predetermined time, the second sensor downstream of the first sensor detects the tip of the paper. The JAM of the paper is detected when it is not detected or when the rear end of the paper is not detected even after a second predetermined time has passed after the front end of the paper is detected by the first sensor. These sensors of the JAM detection unit 22 are arranged inside and outside the fixing unit 18. The JAM detection unit 22 detects at least the occurrence of JAM and whether or not the generation location is inside the fixing unit 18, generates the JAM detection information, and outputs the JAM detection information to the control unit 10. Further, the JAM detection unit 22 detects that the paper has been removed by the user and the door of the image forming apparatus 1 has been closed after the JAM has occurred, generates the JAM recovery detection information, and outputs the JAM recovery detection information to the control unit 10.

Next, the operation of the fixing unit 18 will be described with reference to FIG. FIG. 5A is a diagram showing a fixing portion 18 at the time of printing. The cleaning roller 191 is pressed against the fixing belt 183 by the second moving mechanism 196, the fixing roller 181 is rotated clockwise by the secondary drive due to the rotation of the pressure roller 184, and the cleaning roller 191 is counterclockwise by the second rotating mechanism 195. Rotate clockwise. The paper passes through the first nip portion NP1 and goes in the paper ejection direction.

FIG. 5B is a diagram showing a fixing portion 18 in which the cleaning roller 191 is separated from the fixing belt 183 after JAM is generated, and the cleaning roller 191 and the fixing roller 181 are rotating in the opposite direction to the rotation direction at the time of printing. .. The fixing roller 181 is rotated in the reverse direction by the secondary drive due to the pressure roller 184 being pressed against the fixing belt 183 by the first moving mechanism 186 and rotating in the direction opposite to the rotation direction at the time of printing. The pressure roller 184 presses against the fixing belt 183 to form the first nip portion NP1, the paper is sandwiched between the first nip portion NP1, and the cleaning roller 191 and the fixing roller 181 rotate in the reverse direction to press the paper. It can be pulled in the direction opposite to the transport direction.
FIG. 5C is a diagram showing a fixing portion 18 in which the cleaning roller 191 is pressed against the fixing belt 183 after JAM is generated, and the cleaning roller 191 and the fixing roller 181 are rotating in the opposite direction to the rotation direction at the time of printing. .. This is the same as in FIG. 5 (b) except that the cleaning roller 191 is in pressure contact with the fixing belt 183. In this case, the cleaning roller 191 presses against the fixing belt 183 to form the second nip NP2, the paper is sandwiched between the first nip NP1 and the second nip NP2, and the cleaning roller 191 and the fixing roller 181 rotate in the reverse direction. As a result, the paper can be pulled in the direction opposite to the transport direction.

Here, the operation of the reverse rotation processing by the image forming apparatus 1 will be described with reference to FIG. FIG. 6 is a flowchart showing the first JAM time processing.

In advance, in the image forming apparatus 1, the paper information regarding the paper stored in the paper feed tray 201 of the paper feed unit 20 used in the print process is input from the user via the operation unit 12 and stored in the storage unit 11. It is assumed that it has been done.

Then, it is assumed that the printing process is executed by the control unit 10 in the image forming apparatus 1. Specifically, the control unit 10 determines the image data on the image processing unit 16 by using the image data of the document acquired by the image reading unit 15 or the image data input from the outside by the communication unit 14 as the printing process. Image processing is performed and stored in the storage unit 11, the paper of the paper feed unit 20 is conveyed to the paper transport unit 21, and an image is formed on the paper by the image forming unit 17 based on the image data stored in the storage unit 11. The paper is discharged to the paper discharge tray 24.

Then, in the image forming apparatus 1, the JAM of the paper is generated during the execution of the printing process, and the JAM detection unit 22 inputs the JAM detection information to the effect that the JAM is generated. The first JAM time processing is executed according to the first JAM time processing program stored in.

As shown in FIG. 6, first, the control unit 10 controls the first moving mechanism 186 to separate the pressure roller 184 from the fixing belt 183 (step S101). Then, with reference to the JAM detection information input from the JAM detection unit 22, it is determined whether or not the generated JAM is generated in the fixing unit 18 (step S102). When the place where the JAM is generated is in the fixing unit 18 (step S102; YES), the control unit 10 controls the second moving mechanism 196 to separate the cleaning roller 191 from the fixing belt 183 (step S103).

Next, the control unit 10 refers to the detection information of the temperature sensor 197 and determines whether or not the surface temperature of the cleaning roller 191 is 180 ° C. or higher (step S104). When the surface temperature of the cleaning roller 191 is not 180 ° C. or higher (step S104; NO), the surface temperature of the cleaning roller 191 is adjusted to 180 ° C. or higher by using the second heater 191a (step S105).

In step S104, when the control unit 10 determines that the surface temperature of the cleaning roller 191 is 180 ° C. or higher (step S104; YES), the control unit 10 controls the second moving mechanism 196 to press the cleaning roller 191 against the fixing belt 183. (Step S106). Then, the control unit 10 controls the first moving mechanism 186 to bring the pressure roller 184 into pressure contact with the fixing belt 183 (step S107).

After that, the control unit 10 controls the second rotation mechanism 195 to rotate the cleaning roller 191 in the direction opposite to the rotation direction at the time of printing, and controls the first rotation mechanism 185 to control the pressure roller 184 at the time of printing. The fixing belt 183 is rotated in the reverse direction by rotating the fixing belt 183 in the direction opposite to the rotation direction of the above (step S108). The above is the reverse rotation process of the fixing member. The rotation speed at this time is slower than the rotation speed at the time of printing in order to prevent the paper from tearing. Due to this reverse rotation, the paper is pulled in the direction opposite to the paper transport direction.

Next, the control unit 10 determines whether or not the predetermined time has elapsed, and if it determines that the predetermined time has elapsed (step S109; YES), the control unit 10 controls the second rotation mechanism 195 to rotate the cleaning roller 191 in the reverse direction. By controlling the first rotation mechanism 185 to stop the reverse rotation of the pressure roller 184, the reverse rotation of the fixing belt 183 is stopped. Then, the control unit 10 stops the temperature control of the cleaning roller 191 as well as the reverse rotation of the cleaning roller 191 and the fixing belt 183 (step S110). The method of determining the stop of the cleaning roller 191 and the fixing belt 183 and the pressure roller 184 is based on the elapsed time from the stop signal of the drive motor, or the rotation of the drive gear is detected by using an optical sensor or the like. To judge. After that, the control unit 10 controls the first moving mechanism 186 to separate the pressure roller 184 from the fixing belt 183 (step S111).

Then, the control unit 10 performs JAM processing (step S112). As JAM processing, the control unit 10 displays guidance on the location where the JAM of the paper is generated and the method of removing the paper on the display unit 13, and the door of the housing of the image forming apparatus 1 is closed from the JAM detection unit 22. When the JAM recovery detection information indicating that the JAM paper has been removed is input, the restoration process for resuming printing of each part in the image forming apparatus 1 except the cleaning part 19 is performed, and the JAM process is completed. At this time, the user refers to the guidance, opens the door of the image forming apparatus 1, removes the JAM paper, and closes the door of the image forming apparatus 1.

Then, the control unit 10 performs a return process (step S113). In the present embodiment, the control unit 10 controls the first moving mechanism 186 as a return process to press the pressure roller 184 against the fixing belt 183. Then, the control unit 10 restarts the print process (step S114) and ends the first JAM time process.

When the place where JAM is generated is not in the fixing unit 18 (step S102; NO), the control unit 10 PWM-controls the motor 1853 as a stop process of the fixing unit 18 and gradually reduces the pulse width of the motor 1853. The rotation speed is gradually reduced to gradually stop the rotation of the fixing belt 183, and the take-up portion 193 (motor) is also stopped and driven (step S115). Since the rotation of the fixing member is gradually reduced and stopped, a large load (shearing force, torque) is not applied to the pressure member (fixing roller 181 and pressure roller 184), and the elastic layer of the pressure member is broken or broken. Destruction of drive parts is unlikely to occur.

Then, the control unit 10 shifts to step S112.

The pressure roller 184 may be kept in pressure contact with the fixing belt 183 without executing the first JAM processing step S101. In this case, step S107 is not executed.

Further, the cleaning roller 191 may be kept separated from the fixing belt 183 without executing the first JAM processing step S106. In this case, in step S108, the paper is pulled in the direction opposite to the paper transport direction while the cleaning roller 191 is kept away from the fixing belt 183. Further, in this case, it is necessary to press the cleaning roller 191 against the fixing belt 183 in step S113.

As described above, according to the present embodiment, the cleaning device C1 cleans and removes stains on the fixing portion 18 that fixes the unfixed toner image formed on the paper to the paper. The cleaning device C1 includes a cleaning member (cleaning roller 191) provided in the fixing portion 18 for cleaning and removing dirt adhering to the fixing member (fixing belt 183) that heats and pressurizes the paper, and the inside of the fixing portion 18. A control unit 10 for changing the rotation direction of the cleaning member when the temperature of the cleaning member is equal to or higher than a predetermined temperature according to the jam detection of the paper is provided.

The fixing device F1 includes a cleaning device C1 and a fixing member (fixing belt 183). The image forming apparatus 1 includes a fixing device F1 and an image forming unit 17 for forming an image on paper.

In this way, when the JAM of the paper occurs and the paper wraps around the cleaning roller 191, the paper is sandwiched between the first nip portion NP1 and the second nip portion NP2 in a state where the toner is melted, and the cleaning roller 191 and the cleaning roller 191 and By rotating the fixing roller 181 in the reverse direction, the cleaning member, the paper, and the paper are peeled off, and by pulling the paper in the direction opposite to the paper transport direction, the paper is removed from the cleaning member, and the paper removal work becomes easy. Therefore, the downtime of the image forming apparatus 1 can be shortened.

(Modification example)
A modified example of the above embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart showing the second JAM time processing.

In the above embodiment, the image forming apparatus 1 is configured to execute the first JAM time processing, but in this modification, instead of the first JAM time processing, the second JAM time processing described later is performed. Will be executed. Therefore, as the device configuration in this modification, the image forming device 1 is used as in the above embodiment. However, it is assumed that the ROM 103 of the control unit 10 stores a second JAM time processing program for executing the second JAM time processing described later in place of the first JAM time processing program.

Then, with reference to FIG. 7, the second JAM time processing executed by the image forming apparatus 1 will be described. In advance, in the image forming apparatus 1, the paper information regarding the paper stored in the paper feed tray 201 of the paper feed unit 20 used in the print process is input from the user via the operation unit 12 and stored in the storage unit 11. It is assumed that it has been done.

Then, it is assumed that the printing process is executed by the control unit 10 in the image forming apparatus 1 in advance. Then, in the image forming apparatus 1, the JAM of the paper is generated during the execution of the printing process, and the JAM detection unit 22 inputs the JAM detection information to the effect that the JAM is generated. The second JAM time processing is executed according to the second JAM time processing program stored in.

As shown in FIG. 7, first, the control unit 10 executes steps S201 to S203 similar to steps S101 to S103 of the first JAM time processing.

Here, the control unit 10 determines whether or not the elapsed time from the JAM detection (step S202) in the fixing unit 18 is within a predetermined time (for example, within 5 minutes) (step S203a). When the elapsed time is within 5 minutes (step S203a; YES), the control unit 10 assumes that the surface temperature of the cleaning roller 191 is a temperature sufficient for the toner to melt, and determines that the first JAM processing step S106 Steps S206 to S214 similar to those in ~ S114 are executed. In step 203a, when 5 minutes have passed (step S203a; NO), steps S204 to S205 similar to steps S104 to S105 of the first JAM time processing are executed, and the surface temperature of the cleaning roller 191 is set to 180. Adjust to ℃ or higher. After that, the process proceeds to step S206.

When the place where JAM is generated is not in the fixing unit 18 (step S202; NO), step S215 similar to step S115 of the first JAM time processing is executed, and then the process proceeds to step S212.

As in the case of the first JAM processing, the pressure roller 184 may be kept in pressure contact with the fixing belt 183 without executing the step S201 of the second JAM processing. In this case, step S207 is not executed.

Further, similarly to the first JAM processing, the cleaning roller 191 may be kept separated from the fixing belt 183 without executing the step S206 of the second JAM processing. In this case, in step S208, the paper is pulled in the direction opposite to the paper transport direction while the cleaning roller 191 is kept away from the fixing belt 183. Further, in this case, it is necessary to press the cleaning roller 191 against the fixing belt 183 in step S213.

As described above, according to the present modification, the control unit 10 determines whether or not the step of pressing the cleaning roller 191 against the fixing member (fixing belt 183) within a predetermined time from the detection of JAM in the fixing unit 18 is performed, and from the predetermined time. If the time has passed, the surface temperature of the cleaning roller 191 is adjusted. Therefore, when the step of pressing the cleaning roller 191 to the fixing member (fixing belt 183) is within a predetermined time from the detection of JAM in the fixing portion 18, the next step is to perform the temperature adjustment of the surface temperature of the cleaning roller 191 without executing the temperature control. You can move on to the steps of.

The description in the above-described embodiment and modification is an example of a suitable cleaning device, fixing device, and image forming device according to the present invention, and is not limited thereto.

Further, in the above-described embodiment and modification, the fixing member (fixing roller 181) is driven according to the rotation of the pressure member (pressurizing roller 184), but the present invention is not limited to this. The fixing member (fixing roller 181) may be independently driven.

Further, in the above-described embodiment and modification, the fixing portion 18 has a belt-type fixing device having a fixing belt 183 as a fixing member, a fixing roller 181, a heating roller 182, and a pressure roller 184. However, it is not limited to this. The fixing portion may have a roller type fixing device having a pair of heating rollers and a pressure roller as fixing members.

Further, in the above-described embodiment and modification, the time until the reverse rotation of the cleaning roller 191 and the fixing member (fixing roller 181) is stopped is set in advance, but the torque detecting unit 187 as the torque detecting means is used. When the drive torque of the fixing roller 181 detected by the above is equal to or more than a predetermined value, a control for stopping the reverse rotation of the fixing roller 181 may be added. As a result, the reverse rotation can be stopped when an unexpected force is applied to the fixing roller 181 for some reason, so that it is possible to prevent a malfunction or failure of the fixing portion 18 caused by continuing the reverse rotation. ..

Further, in the above-described embodiment and modification, the time required to stop the reverse rotation of the cleaning roller 191 and the fixing member (fixing roller 181) may be set according to the paper size included in the acquired paper information. good. As a result, it is possible to prevent the vehicle from rotating in the reverse direction more than necessary.

Further, the control unit 10 determines that the paper is wound around the cleaning roller 191 based on the light reflectance detected by the optical sensor 198, and when it is determined that the paper is wound around the cleaning roller 191, the above execution is performed. The reverse rotation process of the form and the modification of the above may be executed. As a result, it is possible to prevent the reverse rotation process from being performed when the reverse rotation process is not required.

When both the cleaning roller 191 and the fixing roller 181 are independently driven by the first rotating mechanism 185 and the second rotating mechanism 195, the image forming apparatus 1 has a speed difference in the rotation speeds of the cleaning roller 191 and the fixing roller 181. Therefore, it is preferable to perform reverse rotation processing at the same rotation speed.

Further, in the above-described embodiment and modified example, when JAM is generated in the fixing portion 18, the fixing member is reversely rotated, but the location where the JAM is generated is not necessarily limited to the fixing portion 18. The fixing member may be reverse-rotated when JAM is generated at a specific place other than the fixing portion 18, or when JAM is generated, the fixing member is reverse-rotated regardless of the place where it is generated. It may be.

Further, the detailed configuration and detailed operation of each part constituting the image forming apparatus 1 in the above embodiments can be appropriately changed without departing from the spirit of the present invention.

1 Image forming device 10 Control unit (control means)
11 Storage unit 12 Operation unit 13 Display unit 14 Communication unit 15 Image reading unit 16 Image processing unit 17 Image forming unit 170 Charging unit 171 Exposure unit 172 Photoreceptor drum 173 Developing unit 174 Cleaning unit 175 Transfer unit 176 Secondary transfer roller F1 Fixing Device 18 Fixing part 181 Fixing roller (fixing member)
181a Axis 182 Heating Roller 182a First Heater 182b Axis 183 Fixing Belt (Fixing Member)
184 Pressurizing roller 184a Shaft 184b Load application mechanism 185 First rotation mechanism 1851, 1852 Drive transmission gear 1853 Motor 1853a Shaft 186 First movement mechanism 187 Torque detection unit (torque detection means)
P Paper W Dirt C1 Cleaning device 19 Cleaning unit 191 Cleaning roller 191a Second heater (adjustment means)
191b Shaft 192 Pressing roller 193 Winding part 193a Feeding shaft part 193b Winding shaft part 194 Cleaning web 195 2nd rotation mechanism 1951, 1952 Drive transmission gear 1953 Motor 1953a Shaft 196 2nd moving mechanism 1961 Biasing member 197 Temperature sensor (temperature) Detection means)
198 Optical sensor (wrapping detection means)
20 Paper feed unit 201 Paper feed tray 21 Paper transport unit 22 JAM detection unit 23 Bus 24 Paper output tray

Claims (17)

A fixing device that fixes an unfixed toner image formed on paper to the paper.
A fixing member that heats and pressurizes the paper, and
A cleaning member that is pressed against the fixing member to clean and remove dirt that has adhered to the fixing member.
A rotation mechanism that freely changes the rotation direction of the cleaning member,
Reverse rotation processing that controls the rotation mechanism to reverse the rotation direction of the cleaning member with respect to the rotation direction at the time of printing when the temperature of the cleaning member is equal to or higher than a predetermined temperature in response to jam detection of the paper. With the control means to execute
A fixing device equipped with. The fixing device according to claim 1, wherein the rotation mechanism rotationally drives the cleaning member. The rotation mechanism directly or indirectly rotates the fixing member and causes the fixing member to rotate directly or indirectly.
The fixing device according to claim 1, wherein the cleaning member is driven by the rotation of the fixing member. A pressure member that presses against the fixing member to form a nip portion,
A first moving mechanism for pressing or separating the pressure member from the fixing member is provided.
The fixing according to claim 3, wherein the control means rotates the fixing member in the reverse direction with respect to the rotation direction at the time of printing in a state where the pressing member is pressed against the fixing member in response to the jam detection of the paper. Device. A torque detecting means for detecting the driving torque of the fixing member is provided.
The fixing device according to claim 3 or 4, wherein the control means stops the reverse rotation of the fixing member when the driving torque of the fixing member detected by the torque detecting means is equal to or higher than a predetermined value. The rotation mechanism
A first rotation mechanism capable of freely switching the rotation speed of the fixing member, and
A second rotation mechanism capable of freely switching the rotation speed of the cleaning member is provided.
The control means controls the rotation mechanism in response to the jam detection of the paper to rotate the rotation direction in the opposite direction to the rotation direction at the time of printing so that the rotation speeds of the cleaning member and the fixing member are the same. The fixing device according to claim 1. The fixing device according to any one of claims 1 to 6, wherein the control means controls the rotation mechanism to reverse-rotate the cleaning member at a speed slower than that at the time of printing and stop after a predetermined time has elapsed. .. The fixing device according to any one of claims 1 to 7, wherein the control means executes the reverse rotation process in response to jam detection of the paper in the fixing device. A second moving mechanism for pressing or separating the cleaning member from the fixing member is provided.
The fixing device according to any one of claims 1 to 8, wherein the control means controls the second moving mechanism to separate the cleaning member from the fixing member in response to jam detection of the paper. A temperature detecting means for detecting the temperature of the cleaning member is provided.
The fixing device according to any one of claims 1 to 9, wherein the control means executes the reverse rotation process when the temperature of the cleaning member detected by the temperature detection means is equal to or higher than a predetermined temperature. The fixing device according to any one of claims 1 to 9, wherein the control means determines whether or not the temperature of the cleaning member is equal to or higher than a predetermined temperature based on the elapsed time from jam detection. An adjusting means for adjusting the temperature of the cleaning member is provided.
The fixing device according to claim 10 or 11, wherein the control means controls the adjusting means to adjust the temperature of the cleaning member to be equal to or higher than a predetermined temperature. The fixing device according to claim 12, wherein the control means ends the temperature adjustment of the cleaning member in response to the reverse rotation stop of the cleaning member. Equipped with an acquisition means to acquire paper size information
The fixing device according to any one of claims 1 to 13, wherein the control means determines a time for rotating the cleaning member in the reverse direction based on the paper size information acquired by the acquisition means. A wrapping detecting means for detecting that the paper is wrapped around the cleaning member is provided.
The fixing device according to any one of claims 1 to 14, wherein the control means executes the reverse rotation process when the wrapping detecting means detects that the paper is wound. The fixing device according to any one of claims 1 to 15.
An image forming apparatus including an image forming unit for forming an image on the paper. A fixing member that heats and pressurizes the paper, a cleaning member that cleans and removes dirt adhering to the fixing member by pressure contact, and a rotation mechanism that freely changes the rotation direction of the cleaning member, and is formed on the paper. The computer of the fixing device that fixes the unfixed toner image on the paper,
As a control means for controlling the rotation mechanism to reverse the rotation direction of the cleaning member with respect to the rotation direction at the time of printing when the temperature of the cleaning member is equal to or higher than a predetermined temperature in response to jam detection of the paper. A program to make it work.

Images