JP2007057935A - Fixing device, control method of fixing device, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing device capable of performing fine control. <P>SOLUTION: The fixing device includes; a rotatable fixing roller 2; a rotatable pressure roller 1 pressed to the fixing roller 2; a plurality of rotatable belt support rollers 4 and 5 disposed apart from each other; an endless belt 6 which is wound around the plurality of belt support rollers 4 and 5 and has a partial area 6a of an outer peripheral surface thereof pressed to a partial area of an outer peripheral surface of the fixing roller 2; a heating means 3 for heating the endless belt 6; a first temperature sensor 7 for controlling the heating means 3; a second temperature sensor 10 for measuring a surface temperature of the fixing roller 2; and a control means 11 which controls the heating means 3 on the basis of a detection result value of the first temperature sensor 7 and controls a paper feed speed or whether paper should be fed or not based on a detection result value of the second temperature sensor 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fixing device that is mounted on an image forming apparatus such as an electrostatic copying machine, a printer, or a facsimile machine and melts and fixes unfixed toner on a sheet to the sheet.

  A fixing device configured to heat the fixing roller not from the inside but from the outside via a belt is already known (see, for example, Patent Document 1).

  FIG. 7 is a configuration diagram of the fixing device described in Patent Document 1. As shown in FIG. 7, the conventional fixing device includes a fixing roller 100, a pressure roller 101 pressed against the fixing roller 100, a heat roller 103 including a heater 102, a belt support roller 108, and a heat roller 103. And an endless belt 104 hung between the belt support rollers 108.

  Further, a part of the outer peripheral surface of the endless belt 104 and a part of the outer peripheral surface of the fixing roller 100 are in pressure contact with each other in the region 100N.

  A sensor 105 for controlling the heat roller 103 is provided inside the endless belt 104 and on the surface of the heat roller 103.

In the fixing device, the fixing roller 100 is heated by the heat roller 103 via the region 104N of the endless belt 104. The temperature of the fixing roller 100 is maintained at about 190 ° C. However, when the paper 109 is continuously fed, the surface temperature of the fixing roller 100 is lowered because the heat is taken away by the paper and ink. The temperature of the fixing roller 100 is controlled by a sensor 105.
JP 11-84934 A

  In recent years, finer control of the fixing temperature has been desired. However, in the fixing device, since the sensor 105 is located away from the fixing roller 100, it is difficult to control the temperature of the fixing roller 100 in detail.

  An object of the present invention is to provide a fixing device, a fixing device control method, a program, and a recording medium capable of performing finer control in consideration of the above-described conventional problems.

In order to achieve the above object, the first present invention provides:
A rotatable fixing roller;
A rotatable pressure roller in pressure contact with the fixing roller;
A plurality of rotatable belt support rollers spaced from each other;
An endless belt wound around the plurality of belt support rollers, a partial region of the outer peripheral surface thereof being in pressure contact with a partial region of the outer peripheral surface of the fixing roller;
Heating means for heating the endless belt;
A first temperature sensor for controlling the heating means;
A second temperature sensor for measuring the surface temperature of the fixing roller;
A sheet is placed between the fixing roller and the pressure roller based on the value of the detection result of the first temperature sensor and the value of the detection result of the second temperature sensor based on the value of the detection result of the second temperature sensor. And a control unit that controls whether to feed the paper or whether to feed the paper.

The second aspect of the present invention is
A rotatable fixing roller;
A rotatable pressure roller in pressure contact with the fixing roller;
A plurality of rotatable belt support rollers spaced from each other;
An endless belt wound around the plurality of belt support rollers, a partial region of the outer peripheral surface thereof being in pressure contact with a partial region of the outer peripheral surface of the fixing roller;
Heating means for heating the endless belt;
A first temperature sensor for controlling the heating means;
A second temperature sensor for measuring the surface temperature of the fixing roller;
And a control unit that controls the heating unit based on a value of a detection result by the first temperature sensor and / or the second temperature sensor.

The third aspect of the present invention
The control unit is the fixing device according to the second aspect of the present invention, which controls to stop the heating unit when a value of a detection result by the first temperature sensor becomes a predetermined value or more.

The fourth aspect of the present invention is
The heating unit is the fixing device according to the first or second aspect of the present invention, which is built in all or a part of the plurality of belt support rollers.

The fifth aspect of the present invention is
The belt support roller incorporating the heating means is the fixing device according to the first or second aspect of the present invention, which is pressed against the fixing roller via the endless belt.

The sixth aspect of the present invention
The first temperature sensor is the first or second fixing device of the present invention, which is provided in an inner space surrounded by the endless belt.

The seventh aspect of the present invention
The first temperature sensor is the fixing device according to the first or second aspect of the present invention, which is disposed on or near the surface of at least one belt support roller of the plurality of belt support rollers.

Further, the eighth aspect of the present invention is
The first temperature sensor is the fixing device according to the first or second aspect of the present invention, which is disposed on the inner peripheral surface of the endless belt or in the vicinity of the inner peripheral surface.

The ninth aspect of the present invention provides
The fixing according to the eighth aspect of the present invention, wherein the first temperature sensor is disposed in a region corresponding to the partial region of the outer peripheral surface of the endless belt, or the inner peripheral surface or the vicinity of the inner peripheral surface. Device.

The tenth aspect of the present invention is
According to the first or second fixing device of the present invention, the pressure roller and the belt support roller are driven in accordance with the driving of the fixing roller.

The eleventh aspect of the present invention is
The temperature sensor is a fixing device according to a seventh aspect of the present invention, which is disposed on the surface or in the vicinity of the surface and in a region corresponding to the sheet passing region of the fixing roller in terms of depth.

The twelfth aspect of the present invention is
The temperature sensor is the fixing device according to an eighth aspect of the present invention, which is disposed in an area corresponding to a sheet passing area of the fixing roller in terms of depth, or in the vicinity of the inner peripheral surface. .

The thirteenth aspect of the present invention is
A rotatable fixing roller, a rotatable pressure roller in pressure contact with the fixing roller, a plurality of rotatable belt support rollers spaced from each other, and a loop between the plurality of belt support rollers A partial area of the outer peripheral surface thereof, an endless belt pressed against a partial area of the outer peripheral surface of the fixing roller, a heating unit for heating the endless belt, and a temperature for controlling the temperature of the heating unit A control method for a fixing device, comprising: a first temperature sensor; and a second temperature sensor for measuring a surface temperature of the fixing roller.
A temperature detecting step of detecting a temperature by the first temperature sensor;
And a control step for controlling whether or not to feed the paper between the fixing roller and the pressure roller based on the value of the detection result of the temperature detection step. This is a control method.

The fourteenth aspect of the present invention is
A rotatable fixing roller, a rotatable pressure roller in pressure contact with the fixing roller, a plurality of rotatable belt support rollers spaced from each other, and a loop between the plurality of belt support rollers A partial area of the outer peripheral surface of the fixing roller, the endless belt being in pressure contact with the partial area of the outer peripheral surface of the fixing roller, a heating means for heating the endless belt, and a first for controlling the heating means. And a second temperature sensor for measuring the surface temperature of the fixing roller, comprising: a fixing device control method comprising:
A temperature detecting step of detecting a temperature by the first temperature sensor and / or the second temperature sensor;
And a control step of controlling the heating unit based on the value of the detection result of the temperature detection step.

The fifteenth aspect of the present invention is
In the control method of the fixing device of the thirteenth aspect of the present invention, based on the temperature detection step of detecting the temperature by the first temperature sensor, and the value of the detection result of the temperature detection step, the fixing roller and the pressure roller A program for causing a computer to execute a control process for controlling whether or not to feed a sheet during the period or whether to feed the sheet.

The 16th aspect of the present invention is
Based on the temperature detection step of detecting the temperature by the first temperature sensor and / or the second temperature sensor and the value of the detection result of the temperature detection step of the control method for the fixing device of the fourteenth aspect of the present invention. A program for causing a computer to execute a control process for controlling the heating means.

The seventeenth aspect of the present invention is
A recording medium on which the program of the fifteenth or sixteenth aspect of the present invention is recorded, and is a recording medium that can be processed by a computer.

  According to the present invention, it is possible to provide a fixing device, a fixing device control method, a program, and a recording medium capable of performing finer control.

  Hereinafter, a fixing device according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is an explanatory diagram viewed from the side of the fixing device according to the first embodiment of the present invention. As shown in FIG. 1, the fixing device according to the first embodiment includes a fixing roller 2, a pressure roller 1 that is pressed against the fixing roller 2, and a heater 3 that is an example of the heating unit of the present invention. 4, a belt support roller 5 disposed at a distance from the heat roller 4, and an endless belt 6 wound between the heat roller 4 and the belt support roller 5. The fixing roller 2 and the pressure roller 1 are composed of an iron mandrel, a silicon sponge that covers the mandrel, and a PFA tube that covers the silicon sponge. The heat roller 4 and the belt support roller 5 are made of an aluminum hollow tube, and the endless belt 6 is made of a polyimide resin.

  The heat roller 4 is pressed against the fixing roller 2 via the endless belt 6, but the belt support roller 5 is disposed at a distance from the fixing roller 2. The endless belt 6 is in pressure contact with a partial region of the outer peripheral surface of the fixing roller 2 in a region 6 a that is a part of the outer peripheral surface of the endless belt 6.

  The first temperature sensor 7 is disposed in a non-contact state in the inner space of the endless belt 6 and in the vicinity of the surface of the heat roller 4. The paper 9 passes between the fixing roller 2 and the pressure roller 1, but the second temperature sensor 10 is installed in a non-contact state in the vicinity of the entrance side through which the paper 9 passes in the direction of arrow P. Control means 11 is provided for controlling the heater 3 based on the temperature detected by the first temperature sensor 7 and controlling the supply stop of the paper 9 based on the temperature detected by the second temperature sensor 10. .

  FIG. 2 is a perspective view of the fixing device according to the first embodiment. As shown in FIG. 2, when the paper 9 is passed through the fixing roller 2, the surface area of the fixing roller 2 in contact with the paper 9 is a paper passing area 12 which is an area indicated by a diagonal line at the center excluding both ends. It becomes. The temperature sensor 7 is disposed in a non-contact state on the surface of the region 13 of the heat roller 4 corresponding to the sheet passing region 12. In FIG. 2, the region 13 is indicated by an alternate long and short dashed line. The temperature sensors 7 and 10 are non-contact infrared temperature sensors that measure the temperatures of the outer peripheral surfaces of the fixing roller 2 and the heat roller 4 and are not in direct contact with the surfaces.

  Further, the fixing roller 2 is connected to a driving means (not shown) and rotates clockwise as indicated by an arrow A in FIG. The pressure roller 1 is driven by the fixing roller 2 and rotates counterclockwise in the direction of arrow B. The endless belt 6, the heat roller 4, and the belt support roller 5 are driven by the fixing roller 2 and rotate counterclockwise in the direction of arrow C.

  The fixing device according to the first embodiment described above is incorporated in the copying machine, and the paper 9 in the unfixed state after the toner is transferred is fed.

  Next, the operation of the fixing device will be described mainly with reference to FIG. 3, and an example of the fixing device control method of the present invention will be described simultaneously.

  A method for controlling the fixing device according to the first embodiment having the above-described configuration will be described below.

  First, in the standby state before the paper 9 is fed between the pressure roller 1 and the fixing roller 2, the heater 3 is turned on by the control means 11 so that the temperature detected by the first temperature sensor 7 becomes 200 degrees. Controlled off. At this time, the temperature detected by the second temperature sensor 10 is about 190 degrees.

  Next, in a paper passing state where the paper 9 can be supplied, the heater 3 is turned on and off by the control means 11 so that the temperature detected by the first temperature sensor 7 is 190 degrees.

  When the fixing roller 2 is driven to rotate in the direction of arrow A in this paper passing state, the pressure roller 1 rotates in the direction of arrow B, and the endless belt 6 rotates in the direction of arrow C. The fed paper 9 passes between the fixing roller 2 and the pressure roller 1 in the direction of arrow P in FIG. 1, and the toner adhering to the surface of the paper 9 is fixed. FIG. 3 shows a graph of changes over time in detection values by the first temperature sensor 7 and the second temperature sensor 10 for explaining the control in the sheet passing state.

  In FIG. 3, the detection value by the first temperature sensor is indicated by a dotted line, and the detection value by the second temperature sensor 10 is indicated by a solid line. In the first embodiment, the surface temperature suitable for fixing of the fixing roller 2 is about 155 degrees.

  The waveform of the interval 18 between the peaks 15 and the valleys 16 appearing in the graph of the second temperature sensor 10 shown in FIG. 3 indicates the temperature state during the period in which the paper 9 passes between the pressure roller 1 and the fixing roller 2. The interval 19 in which the temperature rises again from the valley 16 to the mountain 17 indicates the temperature state during the period in which the paper 9 does not pass. The intervals 18 and 19 differ depending on the paper feeding speed and size of the paper 9. For example, when the paper feeding speed is 140 mm / second and an A3 size paper is supplied, the interval 18 is about 3 seconds. Since the fixing roller 2 is deprived of heat by the melting of the paper 9 and the toner on the paper 9 during the interval 18, the value of the temperature detected by the second temperature sensor 10 decreases. The temperature of the fixing roller 2 rises again by heat conduction from the heater 3 during the interval 18 where the paper 9 does not pass.

  On the other hand, during this time, the heater 3 is controlled to be turned on and off to be 190 degrees by the temperature detected by the first temperature sensor 7.

  Here, when the paper 9 is continuously passed or when the paper size is increased, the heat taken away by the paper and toner exceeds the heat replenished by the heater 3 as shown in FIG. The surface temperature of the fixing roller 2 may decrease. When the temperature detected by the second temperature sensor 10 is 140 degrees or less, the control unit 11 stops the paper supply between the pressure roller 1 and the fixing roller 2. The time when the paper feeding is stopped is indicated by T1 in FIG. Note that the decrease in the surface temperature of the fixing roller 2 varies depending on various conditions such as the number of continuous copies, the paper size, the environmental temperature, and the toner adhesion amount.

  In the state where the paper supply is stopped, the heat of the fixing roller 2 starts to rise because it is not taken away by the paper or the like. When the temperature detected by the second temperature sensor 10 exceeds 155 degrees, the control unit 11 resumes paper feeding and toner fixing on the paper 9 resumes. The time when the paper feeding is resumed is indicated by T2.

  As described above, fine control of the fixing temperature is possible even when various conditions change.

  Further, in the fixing device of the first embodiment, since it is not necessary to provide a heating means in the fixing roller 2, not only the surface of the fixing roller 2, but also, for example, all can be made of silicon rubber or the like. . Therefore, it is possible to increase the nip area, which is useful for color copying or the like that requires a wide nip area in order to obtain gloss.

  In the fixing device according to the first embodiment, since the non-contact infrared temperature sensor is used as the first temperature sensor 7 and the second temperature sensor 10, the heat roller 4 and the fixing roller 2 are respectively near the surfaces of the heat roller 4 and the fixing roller 2. Although it is installed, it may be installed in contact with the surface using, for example, a thermistor as a temperature sensor.

  However, when the thermistor is used as the second temperature sensor 10 and the roller surface is contacted in the sheet passing area 12 of the fixing roller 2, the surface of the fixing roller 2 may be damaged. Toner contamination (attachment) may occur. Therefore, when a temperature sensor is installed on the surface of the fixing roller 2, it is more preferable to provide the temperature sensor in a non-sheet passing area that is an area other than the sheet passing area 12.

  Further, in the first embodiment, the position of the second temperature sensor 10 may be on the exit side of the paper 9 or may be near the surface on the entrance side or the exit side of the pressure roller 1. In order to measure the fixing temperature with higher accuracy, it is more preferable to measure the surface temperature of the fixing roller 2 on the entrance side of the paper 9, as shown in FIGS.

  In the first embodiment, the first temperature sensor 7 is provided in the area 13 corresponding to the paper passing area 12, but may be provided in an area not corresponding to the paper passing area 12.

  Further, in the first embodiment, the first temperature sensor 7 is installed inside the endless belt 6 and in the vicinity of the surface of the heat roller 4, but is provided at a position as shown in FIG. May be. A position where the above-described first temperature sensor 7 is provided is shown as a position 20.

  As shown in FIG. 4, a temperature sensor may be provided on the inner surface of the endless belt 6 at a position 21 in the region 6a. Further, a temperature sensor may be provided at a position 22 on the inner surface of the endless belt 6 between the region 6 a and the region in contact with the belt support roller 5. A temperature sensor may be provided in the inner space of the endless belt 6 and at a position 23 on the outer surface of the belt support roller 5. Furthermore, a temperature sensor may be provided at a position 24 on the inner surface of the endless belt 6 between a region in contact with the belt support roller 5 and a region in contact with the heat roller 4.

  These positions 21, 22, 23, and 24 may be positions in any of the areas corresponding to the paper passing area 12 and the areas not corresponding to the position similar to the position 20.

  Although it is possible to make the fixing device more compact by providing the first temperature sensor 7 in the inner space of the endless belt 6, the outer periphery of the endless belt 6 is not limited to the inner space of the endless belt 6. The first temperature sensor 7 may be provided on the surface or in the vicinity of the surface. In short, the temperature sensor only needs to be installed at a position where the heater 3 can be controlled.

  However, when the first temperature sensor 7 is provided in the outer peripheral surface of the endless belt 6 or in the vicinity of the surface and in the region corresponding to the paper passing region 12, the temperature sensor is not in contact with the outer peripheral surface. Must be used. If the contact-type temperature sensor is used in an area corresponding to the paper area 12, the surface of the endless belt 6 is damaged by the temperature sensor, and the toner adheres and solidifies there, and the solidified toner is fixed to the fixing roller 2 side. This is because it may cause fixing failure, toner contamination (attachment), and the like. When the first temperature sensor 7 is disposed in the inner space of the endless belt 6, the inner peripheral surface of the endless belt 6 does not directly contact the toner, so even if it is an area corresponding to the paper passing area, Not only the contact type but also a contact type temperature sensor can be selected.

  Further, the temperature sensor is not limited to any one of the positions 20, 21, 22, 23, and 24, and may be provided at a plurality of positions, and the fixing temperature is controlled based on the difference at each position. Also good.

  In the first embodiment, when the temperature detected by the second temperature sensor 10 is 140 degrees or less, control is performed so as to stop feeding paper between the pressure roller 1 and the fixing roller 2. However, the control temperature of the heater 3 may be controlled to be raised instead of stopping the paper feed or with the paper feed stopped. For example, you may change 190 degreeC which is the target temperature of control in a paper passing state into 200 degreeC. Such control corresponds to an example of controlling the heating unit based on the detection result values of the first temperature sensor and the second temperature sensor of the present invention.

  The state where the paper supply is stopped may be a state in which only the paper supply of the copying machine is stopped and the operation for reading the data for copying and storing it in the memory may be possible. The reading operation itself may be stopped. In short, it is sufficient that the paper is not fed to the fixing device.

  In the first embodiment, when the temperature detected by the second temperature sensor 10 is 140 degrees or less, control is performed so as to stop paper feeding. For example, the second temperature sensor 10 Control may be performed so that the paper feed speed is slowed down when the detected temperature becomes 145 ° C. or less, and the paper feed speed is restored when the detected temperature reaches 155 ° C. If the temperature detected by the second temperature sensor 10 is 145 ° C. or lower and the paper feed speed is controlled to be slow, but the detected temperature is 140 ° C. or lower, the paper is further fed. You may control so that it may stop.

  In the first embodiment, the control of the heater 3 by the first temperature sensor 7 and the control of the paper feed by the second temperature sensor 10 are performed by one control means 11, but two controls are performed. Means may be provided and performed by each control means.

(Embodiment 2)
The fixing device according to the second embodiment of the present invention will be described below. FIG. 5 is a side view of the fixing device according to the second embodiment. As shown in FIG. 5, the fixing device of the second embodiment has the same basic configuration as that of the first embodiment, but the control means is different. Therefore, this difference will be mainly described. In addition, the same code | symbol is attached | subjected about the component same as Embodiment 1. FIG.

  That is, unlike the control unit 11 of the first embodiment, the control unit 40 of the fixing device of the second embodiment performs on / off control of the heater 3 according to the temperature detected by the second temperature sensor 10, and the first The present embodiment is different from the first embodiment in that an excessive temperature rise of the heat roller 4 by the heater 3 is detected by the temperature detected by the temperature sensor 7.

  Hereinafter, a method for controlling the fixing device according to the second embodiment will be described in detail.

  In the standby state, the control means 40 controls the heater 3 on and off so that the temperature detected by the second temperature sensor 10 is 190 degrees. The temperature detected by the first temperature sensor 7 at this time is about 200 degrees.

  Next, in the sheet passing state, the control means 40 controls the heater 3 on and off so that the temperature detected by the second temperature sensor 10 is about 155 degrees. FIG. 6 shows a graph of change over time in detection values by the first temperature sensor 7 and the second temperature sensor 10 for explaining the control in the sheet passing state. In FIG. 6, the detection value by the first temperature sensor 7 is indicated by a dotted line, and the detection value by the second temperature sensor 10 is indicated by a solid line.

  When the detection value by the second temperature sensor 10 is about 155 degrees, the detection value by the first temperature sensor 7 is often kept at about 190 degrees, but the sheet is continuously fed and the fixing temperature is lowered. In this case, the temperature of the heater 3 may rise by turning on the heater 3 in order to keep the fixing temperature at 155 degrees.

  When the temperature detected by the first temperature sensor 7 exceeds 230 degrees, which is an example of the predetermined value of the present invention, the control means 40 turns off the heater 3. The time when the heater 3 is turned off is indicated by T3 in FIG.

  Then, the detection value by the first temperature sensor 7 starts to decrease. When the detected value by the first temperature sensor 7 is 190 degrees or less, the heater 3 is turned on. This time is indicated by T4.

  As described above, the control for turning on and off the heater 3 based on the detection result values of the first temperature sensor 7 and the second temperature sensor 10 is the first temperature sensor and the second temperature sensor of the present invention. This corresponds to an example of control of the heating means based on the value of the detection result.

  By the fixing device control method, it is possible to avoid deterioration of the endless belt 6, the fixing roller 2 (particularly the surface PFA tube), the bearings of each roller, the resin housing, and the like due to the temperature of the heater 3 being excessively increased. Become.

  If the paper is continuously fed between the pressure roller 1 and the fixing roller 2 when the heating by the heater 3 is stopped, the surface temperature of the fixing roller 2 decreases, and the detection value by the second temperature sensor 10 decreases. However, at this time, as described in the first embodiment, for example, when the detection value by the second temperature sensor 10 is 140 degrees or less, the feeding of the paper may be stopped.

  Further, the position of the second temperature sensor 10 is not limited to the position shown in FIG. 5, but the second temperature sensor 10 prevents the temperature of the heater 3 from excessively rising. Rather than such positions 21, 22, 23, 24, it is preferable to install on the surface of the heat roller 4 where the temperature of the heater 3 can be detected quickly or in the vicinity of the surface.

  Also, the inner space of the endless belt 6 is not limited to the inner surface of the heat roller 4 outside the endless belt 6. However, as described in the first embodiment, the inner space is used from the viewpoint of compactness. It is more preferable to provide it, and even if it is a region corresponding to the paper passing region, it is possible to select not only a non-contact type but also a contact type temperature sensor.

  The program of the present invention is for causing a computer to execute the operation of both or one of the temperature detection process and the control process of the fixing device control method according to the present invention described in the first and second embodiments. A program that operates in cooperation with a computer.

  The recording medium of the present invention also includes a program for causing a computer to execute all or part of the operation of both or one of the temperature detection process and the control process of the above-described fixing device control method according to the present invention. A recorded recording medium is a recording medium that can be read by a computer and that the read program executes the operation in cooperation with the computer.

  The “process operation” of the present invention means the operation of all or part of the process.

  Further, one use form of the program of the present invention may be an aspect in which the program is recorded on a recording medium such as a ROM readable by a computer and operates in cooperation with the computer.

  Also, one use form of the program of the present invention is an aspect in which the program is transmitted through a transmission medium such as the Internet, a transmission medium such as light, radio wave, and sound wave, read by a computer, and operates in cooperation with the computer. Also good.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, but may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  According to the fixing device and the fixing device control method of the present invention, finer control can be performed, which is useful as a fixing device used in a copying machine or the like.

Explanatory drawing which looked at the fixing device in Embodiment 1 concerning this invention from the side. 1 is a perspective view of a fixing device according to a first embodiment of the present invention. The figure for demonstrating control of the fixing device in Embodiment 1 concerning this invention. Explanatory drawing which looked at the modification of the fixing device in Embodiment 1 concerning this invention from the side. Explanatory drawing which looked at the fixing device in Embodiment 2 concerning this invention from the side. FIG. 6 is a diagram for explaining control of a fixing device according to a second embodiment of the present invention. Configuration of conventional fixing device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure roller 2 Fixing roller 3 Heater 4 Heat roller 5 Belt support roller 6 Endless belt 6a Area | region 7 1st temperature sensor 9 Paper 10 2nd temperature sensor 11 Control means

Claims (17)

A rotatable fixing roller;
A rotatable pressure roller in pressure contact with the fixing roller;
A plurality of rotatable belt support rollers spaced from each other;
An endless belt wound around the plurality of belt support rollers, a partial region of the outer peripheral surface thereof being in pressure contact with a partial region of the outer peripheral surface of the fixing roller;
Heating means for heating the endless belt;
A first temperature sensor for controlling the heating means;
A second temperature sensor for measuring the surface temperature of the fixing roller;
A sheet is placed between the fixing roller and the pressure roller based on the value of the detection result of the first temperature sensor and the value of the detection result of the second temperature sensor based on the value of the detection result of the second temperature sensor. A fixing device comprising: a control means for controlling whether to feed the paper or whether to feed the paper. A rotatable fixing roller;
A rotatable pressure roller in pressure contact with the fixing roller;
A plurality of rotatable belt support rollers spaced from each other;
An endless belt wound around the plurality of belt support rollers, a partial region of the outer peripheral surface thereof being in pressure contact with a partial region of the outer peripheral surface of the fixing roller;
Heating means for heating the endless belt;
A first temperature sensor for controlling the heating means;
A second temperature sensor for measuring the surface temperature of the fixing roller;
And a control unit that controls the heating unit based on a value of a detection result by the first temperature sensor and / or the second temperature sensor.   The fixing device according to claim 2, wherein the control unit performs control so as to stop the heating unit when a value of a detection result by the first temperature sensor becomes a predetermined value or more.   The fixing device according to claim 1, wherein the heating unit is built in all or a part of the plurality of belt support rollers.   The fixing device according to claim 1, wherein the belt support roller including the heating unit is pressed against the fixing roller via the endless belt.   The fixing device according to claim 1, wherein the first temperature sensor is provided in an inner space surrounded by the endless belt.   3. The fixing device according to claim 1, wherein the first temperature sensor is disposed on or near a surface of at least one belt support roller of the plurality of belt support rollers.   The fixing device according to claim 1, wherein the first temperature sensor is disposed on an inner peripheral surface of the endless belt or in the vicinity of the inner peripheral surface.   The fixing device according to claim 8, wherein the first temperature sensor is disposed in an area corresponding to the partial area of the outer peripheral surface of the endless belt, which is the inner peripheral surface or the vicinity of the inner peripheral surface. .   The fixing device according to claim 1, wherein the pressure roller and the belt support roller are driven according to driving of the fixing roller.   The fixing device according to claim 7, wherein the first temperature sensor is disposed in a region corresponding to a sheet passing region of the fixing roller in the depth or in the vicinity of the surface.   9. The fixing device according to claim 8, wherein the first temperature sensor is disposed in an area corresponding to a sheet passing area of the fixing roller in terms of depth, which is the inner peripheral surface or the vicinity of the inner peripheral surface. . A rotatable fixing roller, a rotatable pressure roller in pressure contact with the fixing roller, a plurality of rotatable belt support rollers spaced from each other, and a loop between the plurality of belt support rollers A partial area of the outer peripheral surface of the fixing roller, the endless belt being in pressure contact with the partial area of the outer peripheral surface of the fixing roller, a heating means for heating the endless belt, and a first for controlling the heating means. And a second temperature sensor for measuring the surface temperature of the fixing roller, comprising: a fixing device control method comprising:
A temperature detecting step of detecting a temperature by the first temperature sensor;
A fixing device, comprising: a control step for controlling whether or not to feed the paper between the fixing roller and the pressure roller based on the value of the detection result of the temperature detection step. Control method. A rotatable fixing roller, a rotatable pressure roller in pressure contact with the fixing roller, a plurality of rotatable belt support rollers spaced from each other, and a loop between the plurality of belt support rollers A partial area of the outer peripheral surface of the fixing roller, the endless belt being in pressure contact with the partial area of the outer peripheral surface of the fixing roller, a heating means for heating the endless belt, and a first for controlling the heating means. And a second temperature sensor for measuring the surface temperature of the fixing roller, comprising: a fixing device control method comprising:
A temperature detecting step of detecting a temperature by the first temperature sensor and / or the second temperature sensor;
And a control step of controlling the heating unit based on the value of the detection result of the temperature detection step.   A temperature detection step of detecting a temperature by the first temperature sensor and a value of a detection result of the temperature detection step of the fixing device control method according to claim 13, and the fixing roller and the pressure roller A program for causing a computer to execute a control process for controlling whether to feed a sheet in between or whether to feed the sheet.   The temperature detection step of detecting the temperature by the first temperature sensor and / or the second temperature sensor of the method for controlling the fixing device according to claim 14, and a value of a detection result of the temperature detection step, The program for making a computer perform the control process which controls the said heating means. 17. A recording medium on which the program according to claim 15 or 16 is recorded, wherein the recording medium can be processed by a computer.

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