JP3239074B2 - Fixing temperature control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method for a copying machine and various printers, and more particularly to a belt-type fixing temperature control method.

[0002]

2. Description of the Related Art Conventionally, as an electrophotographic fixing device, a pair of upper and lower rollers coated with a non-adhesive substance such as fluororesin or silicone rubber is used, and a heat source such as a halogen lamp is provided inside the roller. A heat roller system is often used in which a suitable pressure is applied in between, and a recording paper having toner transferred thereto is inserted into the nip portion to fix the recording paper.

In the heat roller method, the toner and the recording paper must be rapidly raised to a temperature at which the toner and the recording paper can be fixed only at a nip formed by two upper and lower rollers which are pressed. In order to satisfy the requirements, it is necessary to increase the outer diameter of the heat roller to secure the heat capacity, and to raise the fixing temperature to a considerably high temperature, so that a large amount of oil for release is indispensable to prevent hot offset. Met. However, in this method, it is difficult to shorten the warm-up time and reduce the power consumption, and there are problems such as image stains due to oil for releasing.

However, a belt-type fixing device has recently been developed as a technique capable of solving the above problem (see JP-A-6-318001). This belt type fixing device will be briefly described below with reference to FIG.

In this fixing apparatus, an endless fixing belt c is stretched between a heating roller a provided with a heating source e and a fixing roller b, and a pressing roller for pressing the fixing roller b from below via the fixing belt c. d, and a substantially linear paper guide f at a position close to and below the fixing belt c on the upstream side of the nip formed by the fixing belt c and the pressure roller d. The surface temperature of the fixing belt c is determined by a temperature detecting element g disposed at a position in contact with the surface of the fixing belt c on the heating roller a side of the fixing belt c.
The ON / OFF control of the heating source e is performed by the signal and a main body control unit (not shown). The fixing belt c is a low heat capacity belt in which a thin endless metal belt is coated with a non-adhesive silicone rubber or the like.

When the recording paper of the unfixed image is conveyed to the fixing device having the above-described structure, the toner and the recording paper are preheated via the fixing belt c, and the melting of the toner is started. As a result, the temperature of the nip formed by the fixing belt c and the pressure roller d can be set low, and the fixing belt c
Is small, the fixing belt c is rapidly cooled when the recording paper passes through the nip, and the temperature of the toner on the recording paper, which is released from the fixing belt c at the nip exit, can be suppressed. A good image without offset can be obtained by coating.

FIG. 9 shows the power supply O of the main body in the prior art.
FIG. 7 is a diagram illustrating a relationship between a temperature of a fixing roller on a heating roller side and a time of a temperature of a paper input guide at the time of warm-up from N;

[0008]

However, sufficient consideration has not been given to the conventional fixing device disclosed above in view of fluctuations in the installation environment of the main body and various printing modes.

That is, the belt-type fixing device preheats the surface of the recording paper from the fixing belt while the recording paper is conveyed on the paper input guide before fixing the toner and the recording paper in the nip portion. By preheating the back of the recording paper from the paper input guide,
The feature is to start melting the toner and keep the temperature of the nip low.However, since the temperature control method at the time of warm-up is not considered, printing is performed at low operating temperature or on paper with large heat capacity such as thick paper. In such a case, there is a problem that a sufficient preheating effect cannot be obtained, resulting in poor fixing.

Also, when the temperature of the paper input guide is lowered more than necessary due to the multi-printing, there is a problem that the paper input guide similarly cannot obtain a sufficient preheating effect, resulting in poor fixing.

As a countermeasure against the above-mentioned problem, there is a method in which the conveying speed is reduced, the preheating time for the toner and the recording paper is increased, and a preheating effect is exhibited. However, in this method, the printing speed is reduced. There was a problem that it was slow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and one temperature detecting element is disposed at each of a position where the temperature roller contacts the fixing belt on the heating roller side and a position where the temperature detecting element contacts the rear surface of the paper input guide. It is another object of the present invention to provide a fixing temperature control method capable of detecting two temperatures in a fixing device.

[0013]

According to a first aspect of the present invention, there is provided a belt-type fixing temperature control method, wherein a temperature detecting element is provided at a position where the temperature detecting element is in contact with the fixing belt on the heating roller side and a position where the temperature detecting element is in contact with the back of the paper input guide. By arranging them one by one, it is possible to detect the temperature at two places in the fixing device.

[0014] Then, the temperature control during the warm-up from the power supply ON, to start the temperature control of the heater lamp fixing belt stopped, after a predetermined time, to start the rotation of the fixing belt, disposed Nyukami guide back surface The temperature of the paper input guide is detected by the detected temperature detecting element, and when the temperature reaches a certain temperature, the rotation of the fixing belt is stopped, and at that time, the temperature of the temperature detecting element arranged on the heating roller side is detected. If the temperature has reached a certain temperature, the warm-up is terminated; otherwise, heating is continued until the temperature reaches a certain temperature, and then the warm-up is terminated. At this time, the heater lamp O
The N-OFF control is performed based on the temperature of a temperature detecting element arranged on the heating roller side.

The fixing temperature control method of the belt system according to claim 2, wherein the body at the time of wait state, always keep detecting the temperature of the incoming paper guide at the temperature sensing element disposed Nyukami guide back surface, its temperature When the temperature falls below a certain temperature, the temperature control of the heater lamp is started in a state where the fixing belt is stopped, and after a certain time, the rotation of the fixing belt is started, and the temperature detection element arranged on the back of the paper input guide detects the temperature of the paper input guide. When the temperature is detected and the temperature reaches a certain temperature, the rotation of the fixing belt is stopped, and if the temperature of the temperature detecting element arranged on the heating roller side has reached the certain temperature at that time, the warming is performed. If not, continue heating until a certain temperature is reached, and then terminate warm-up,
The on / off control of the heater lamp is a fixing temperature control method that is performed based on the temperature of a temperature detecting element arranged on the heating roller side.

The fixing temperature control method of the belt system according to claim 3, wherein, at the time of multi-printing operation, always keep detecting the temperature of the incoming paper guide at the temperature sensing element disposed Nyukami guide back surface, its temperature constant If the temperature falls below, the printing operation is interrupted, the temperature control of the heater lamp is started with the fixing belt stopped, and after a certain period of time, the rotation of the fixing belt is started. The temperature of the paper input guide is detected at the time, when the temperature reaches a certain temperature, the rotation of the fixing belt is stopped, and at that time, the temperature of the temperature detecting element arranged on the heating roller side reaches the certain temperature. If it has, warm-up is completed; otherwise, heating is continued until a certain temperature is reached, and then warm-up is completed, and the on / off control of the heater lamp is arranged on the heating roller side. And a fixing temperature control method performed by the temperature of the temperature sensing element.

[0017] According to the fixing temperature control method of the belt system according to claim 4, the temperature control at the time of recovery from jam processing, and starts the temperature control of the heater lamp fixing belt stopped, after a predetermined time, entering The temperature of the paper input guide is detected by the temperature detection element arranged on the back of the paper guide, and the temperature has reached a certain temperature, and at that time the temperature of the temperature detection element arranged on the heating roller side has reached a certain temperature. If the temperature has reached, the recovery is completed, otherwise, heating is continued until the temperature reaches a certain temperature, and then the recovery is completed, and the off-off control of the heater lamp is performed by the temperature of the temperature detecting element arranged on the heating roller side. This is a fixing temperature control method.

According to the control method of the first aspect of the present invention, one temperature detecting element is disposed at each of the heating roller side at the position in contact with the fixing belt and at the position in contact with the back surface of the paper input guide. It is possible to simultaneously detect not only the temperature of the fixing belt surface but also the temperature of the paper input guide.

[0019] Then, in the temperature control during the warm-up from the power supply ON, to start the temperature control of the heater lamp fixing belt stopped, after a predetermined time, to start the rotation of the fixing belt, Nyukami guide back surface The temperature of the paper input guide is detected by the temperature detecting element disposed at the position, and when the temperature reaches a certain temperature, the rotation of the fixing belt is stopped, and at that time the temperature detecting element disposed on the heating roller side. If the temperature has reached a certain temperature, the warm-up is terminated.Otherwise, heating is continued until the temperature reaches a certain temperature, and then the warm-up is completed. Is more than a certain temperature, and at the time of printing, effective preheating can be performed from the paper input guide to the back surface of the recording paper.

According to the control method of the second aspect , when the main body is in the wait state, the temperature of the paper input guide is always detected by the temperature detecting element disposed on the back surface of the paper input guide, and the temperature is kept at a constant temperature. If it falls below, since the control according to claim 1 is being performed, after leaving the main body in the weight state for a long time,
Even when the printing operation is started, the temperature of the paper input guide is always equal to or higher than a certain temperature, and effective preheating can be performed from the paper input guide to the back surface of the recording paper.

According to the control method of the third aspect , when the main body is in the multi-printing operation, the temperature of the paper input guide is always detected by the temperature detecting element arranged on the back surface of the paper input guide, and the temperature is kept at a constant temperature. If it falls below, the printing operation is interrupted and the
Since the control described in ( 1) is performed, it is possible to prevent the problem of defective fixing, which occurs when the temperature of the paper input guide decreases during multi-printing.

According to the control method of the fourth aspect, in the temperature control at the time of recovery from the jam processing, the temperature control of the heater lamp is started while the fixing belt is stopped, and after a lapse of a predetermined time, the back of the paper input guide. The temperature of the paper input guide is detected by the temperature detection element arranged at the position, and the temperature has reached a certain temperature, and at that time, the temperature of the temperature detection element arranged at the heating roller side has reached the certain temperature. If the recovery is finished, otherwise continue heating until a certain temperature is reached, and then finish the recovery.
If the installation environment of the main unit is higher than normal temperature and the inside temperature of the machine is relatively high, or if the printing operation is performed sporadically and the paper input guide can maintain a relatively high temperature, a jam occurs.
When the recovery is performed thereafter, the fixing belt does not need to be rotated, and the recovery operation can be completed in a short time.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fixing temperature control method according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a printer according to an embodiment of the present invention.

In FIG. 1, the printer is provided with a paper feed tray 2 for inserting a plurality of sheet-like recording papers on a side surface of the main body. Roller 3 for feeding paper sequentially
A paper transport path a4 in which a PS sensor 14 for detecting the leading end of the recording paper is provided in a substantially horizontal direction downstream of the paper feed roller 3, and a photoconductor for forming an electrostatic latent image is provided. A drum cartridge 6 having a drum 5 and a transfer roller 7 are provided.

Further, a fixing device 20 is provided further downstream of the transfer roller 7 to fix the toner image formed on the recording paper and to form an image on a discharge tray 11 provided on a front cover of the main body. And a U-turn guide 12 for discharging the recording paper. A developing device 8 for supplying toner to the surface of the photosensitive drum 5 is provided on the right side of the drum cartridge 6, and an optical unit 15 for irradiating the photosensitive drum 5 with light is provided above the developing device 8. Have been.

The light 17 emitted from the optical unit 15 irradiates the surface of the photosensitive drum 5 charged in advance,
When the photosensitive drum 5 is exposed, an electrostatic latent image is formed on the surface of the photosensitive drum.

This electrostatic latent image is adhered to the photosensitive drum 5 by toner supplied from the developing device 8 and developed,
The toner image is sent toward a contact portion between the photosensitive drum 5 and the transfer roller 7 as the photosensitive drum 5 rotates.

On the other hand, at this time, recording paper is supplied from the paper supply tray 2 by the paper supply roller 3, and this recording paper is conveyed along the paper conveyance path a4, the PS sensor 14 is turned on, and stopped. It is sent to a pair of upper and lower PS rollers 13. Thereafter, the PS roller 13 rotates in accordance with the light emission timing of the optical unit 15 controlled by the control unit 19 based on the ON signal of the PS sensor 14,
The recording paper is conveyed to a transfer area, which is a contact portion between the photosensitive drum 5 and the transfer roller 7. When the recording paper passes through this area, the toner image formed on the surface of the photosensitive drum 5 is transferred to the recording paper by a potential difference between the electric charge and the electric charge on the surface of the recording paper.

Next, the recording paper is guided to a paper transport path b9 holding a suction sensor 10 for detecting the paper, and then inserted into the fixing device 20. The fixing device 20 includes a heating source 2
6 (hereinafter referred to as a heater lamp), a pressure roller that stretches an endless fixing belt 21 between a heating roller 23 provided with a fixing roller 24 and presses the fixing roller 24 from below through the fixing belt 21. 25,
Further, a mechanism is provided in which a substantially linear paper guide 22 is provided at a position close to and below the fixing belt 21 on the upstream side of the nip portion 27 formed by the fixing belt 21 and the pressure roller 25. The fixing belt 21 is a low heat capacity belt in which a thin endless metal belt is coated with a non-adhesive silicone rubber or the like.

When the recording paper of the unfixed image is conveyed to the fixing device 20 having the above-described structure, the toner and the recording paper are preheated via the fixing belt 21, and the melting of the toner is started. As a result, the fixing belt 21 and the pressure roller 25
Since the temperature of the nip portion 27 formed by the above process can be set low and the heat capacity of the fixing belt 21 is small, the fixing belt 21 is rapidly cooled when the recording paper passes through the nip portion 27 and the nip portion 2
The temperature of the toner on the recording paper that is released from the fixing belt 21 at the exit 7 can be suppressed, and a good image without offset can be obtained by oilless or by applying a small amount of oil. Then, the recording paper sent from the fixing device 20 is guided upward of the main body along the U-turn guide 12 and is discharged onto the discharge tray 11.

The above is a series of printing operations of the present printer. The setting environment of the printer is various, such as a case where the printer is installed at a low temperature, a case where printing is performed on a paper having a large heat capacity such as a thick paper, or When performing multi printing,
If the thermal state of the paper input guide 22 is not sufficiently taken into consideration, there is the following problem.

That is, the temperature of the printer itself is low in a low-temperature environment, and the temperature of the paper input guide 22 is naturally lower than that in a normal-temperature environment. Since the paper input guide 22 is heated by heat transfer from the fixing belt 21 heated by the heater lamp 26 via the air layer, unless the fixing belt 21 is rotated during warm-up, the paper input guide 2 is heated.
2, only the upstream side (below the heating roller 23) is heated,
The effect of heat transfer from the fixing belt 21 decreases as the position goes downstream, and a large temperature rise cannot be expected. Even if printing is performed to some extent and the temperature of the paper input guide 2 once rises, if the wait state continues for a long time, heat is released into the air,
In some cases, the temperature may drop. The paper input guide 22 during multi-printing is preheated by the fixing belt 21 in a state where the recording paper 31 is not on the paper input guide 22 (between the recording paper 31 during multi-printing). When the recording paper 31 passes over the paper input guide 22, the amount of heat of the paper input guide 22 is taken by the toner and the recording paper 31, and the temperature decreases. Therefore, even in multi-printing, if the amount is not too large,
Although the temperature of the paper input guide 22 does not drop so much, the temperature drop becomes large when a large number of multi-printing operations are performed. These are problems that occur because the thermal state of the paper input guide 22 is not taken into account.

The problem described above has been solved in the present invention by the following method. FIG. 2 is a diagram showing a configuration of the fixing device 20 of the present invention.

(Embodiment 1) An embodiment according to claim 1 will be described below.

A temperature detecting element A 35 (hereinafter, referred to as a thermistor A) is provided on the outer peripheral portion of the heating roller 23 in contact with the surface of the fixing belt 21, and a temperature detecting element is provided on a substantially central portion of the rear surface of the paper input guide 22. B36 (hereinafter, referred to as thermistor B) are arranged so that the temperature of the fixing belt 21 on the heating roller 23 side and the temperature of the center of the back surface of the paper input guide 22 can be detected.

FIG. 3 shows the relationship between the temperature on the heating roller side of the fixing belt 21 and the time of the temperature of the paper input guide 22 at the time of warm-up after the power of the main body is turned on.

Hereinafter, TH1 and TH2 are defined as follows. TH1: Temperature at the side of the heating roller 23 of the fixing belt 21 (temperature detected by the thermistor A) TH2: Temperature at the center of the back surface of the paper input guide 22 (temperature detected by the thermistor B).

When the power of the main body is turned on, the heater lamp 26 is turned on, and TH1 starts rising from the room temperature.
At this time, TH2 is still at room temperature. Next, the rotation of the fixing belt 21 starts to be started by a driving device (not shown) t1 seconds after the power is turned on. The rotation rate of the fixing belt 21 slows the rate of increase of TH1.
Start to rise due to the preheating effect from 1. Thereafter, TH2 reaches T2, which is a temperature at which a good fixing strength can be secured, as the temperature of the paper input guide 22. At this time, if the temperature of TH1 is lower than the control temperature T0 of the heater lamp 26, the heating is continued until T0, and the warm-up is completed.

If TH2 arrives before TH2 reaches T2,
When 1 reaches T0, the heater lamp 26 is turned off, but the fixing belt 21 is still rotating.
The amount of heat stored in the fixing belt 21 is
And TH1 falls below T0. As a result, the heater lamp 26 is turned on again, and the same control is repeated. When TH2 reaches T2, the determination of TH1 is performed again, and the warm-up is completed.

That is, the stop of the rotating fixing belt 21 is determined under the condition of TH2 ≧ T2.
The ON-OFF control of No. 6 is performed by comparing TH1 with T0, and the warm-up is terminated under the condition of TH1 ≧ T0.

The solid line shown in FIG. 3 shows the temperature on the heating roller side of the fixing belt 21 and the paper input guide 22 in this embodiment.
, And the dotted lines represent those of the prior art.

As is clear from FIG. 3, in the present embodiment, the temperature of the paper input guide 22 at the start of printing is T4, which is higher than the temperature T1 of the paper input guide 22 at the start of printing in the prior art. ing. Therefore, even when printing is performed on a paper having a large heat capacity such as a low-temperature environment or thick paper, sufficient heat transfer can be performed from the paper input guide 22 to the back surface of the recording paper, and the problem of poor fixing does not occur.

(Embodiment 2) An embodiment according to claim 2 will be described below.

FIG. 4 shows the relationship between the temperature on the heating roller side of the fixing belt 21 and the time of the temperature of the paper input guide 22 at the time of warm-up from the wait state.

When the main body is in the wait state for a long time, TH
1 is an ON-OFF control of the heater lamp 26, which is always T
Although the value fluctuates around 0, TH2 gradually decreases because the fixing belt 21 has been stopped for a long time.

In the present embodiment, if TH2 is lower than the fixed temperature T3 (ta in the figure), the printable state is prohibited, and the method 1
A warm-up state is entered by the temperature control method described in the embodiment. Thereafter, the warm-up is completed, and the printer returns to a printable state.

As is clear from FIG. 4, in this embodiment, similarly to the embodiment described in Method 1, the temperature of the paper input guide 22 at the start of printing is T4, which is the same as that of the prior art. Is higher than the temperature T1 of the paper input guide 22 of FIG. Therefore, even if the weight state of the main body continues for a long time and the temperature of the paper input guide 22 decreases due to heat release to the air, the temperature of the paper input guide 22 recovers, and the temperature of the paper input guide 22 recovers. Heat transfer can be performed, and the problem of defective fixing does not occur.

(Embodiment 3) An embodiment according to claim 3 will be described below.

FIG. 5 shows the relationship between the temperature of the fixing belt 21 on the heating roller side and the time of the temperature of the paper input guide 22 at the time of warm-up from the multi-printing state.

When the energy consumed in the fixing device 20 and the energy consumed by the recording paper and the toner exceed the energy supplied from the heater lamp 26 by a large amount of multi-printing, the temperature of the paper input guide 22 gradually decreases. start. In this embodiment, if TH2 is lower than the constant temperature T3 (tb in the figure), the printing state is temporarily interrupted, and the apparatus enters the warm-up state by the temperature control method described in the embodiment of Method 1. Thereafter, the multi-printing is restarted at the same time when the warm-up is completed (tc in the figure).

In this embodiment, as in the embodiment described in Method 1, the temperature of the paper input guide 22 at the time of restarting the multi-printing is set to T.
2, this is higher than the temperature T1 of the paper input guide 22 at the start of printing in the prior art. Therefore, even if the temperature of the paper input guide 22 is excessively lowered by a large amount of multi-printing, the multi-printing is temporarily interrupted and the paper input guide can be heated by warm-up, so that the temperature of the paper input guide 22 is recovered. However, sufficient heat transfer can be performed on the back surface of the recording paper, and the problem of defective fixing does not occur.

(Embodiment 4) An embodiment according to claim 4 will be described below.

FIG. 6 shows the temperature on the heating roller side of the fixing belt 21 and the paper input guide 22 at the time of recovery from the jam processing.
3 shows the relationship between the temperature and the time.

If a paper jam occurs during printing, the printer main body stops the printing operation, and indicates to the main body operating section or the PC (not shown) that the main body is in a jam state and that the jammed paper needs to be removed. The user removes the jam paper in the main body according to the instruction.

In the present embodiment, the temperature control of the heater lamp 26 is started at the time when the processing is completed (td in the figure), and after a certain time t1 (te in the figure), if TH2 is equal to or higher than the certain temperature T3, The rotation of the fixing belt 21 as in the embodiments described in the above-described methods 1 to 3 is not performed, and the determination of TH1 is immediately performed. If TH1 <T0, the heating is continued, and the recovery is terminated when TH1 ≧ T0. (T in the figure
f) Conversely, if TH1 ≧ T0, the recovery is terminated at that point.

If a jam occurs during the operation of the main body, if the temperature inside the machine is low because the installation environment of the main body is low, or if the time from the occurrence of the jam to the jam processing is long, the temperature of the paper input guide 22 becomes lower. If it is going down, method 1
Alternatively, it is necessary to control the temperature by the method of the embodiment described in the method 2. However, if the paper input guide 22 can maintain a relatively high temperature after the jam processing, the temperature is controlled by the method of the embodiment described in the method 4. Even if the control is performed, the problem of defective fixing does not occur, and the jam recovery time is reduced.

FIG. 7 is a flowchart showing the operation of the example described in the first to fourth embodiments.

In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and it goes without saying that the present invention can be appropriately modified and implemented without departing from the scope of the invention.

[0059]

Effects of the Invention According to the fixing temperature control method according to claim 1, wherein the temperature of Fixing belt course, Nyukami guide temperature changes due to environmental variations and various paper feeding situation can be detected simultaneously,
Effective control of the heater lamp can be realized by the temperature data.

[0060] and, even if the temperature of Nyukami guide varies by environmental changes or the like at the time of warm-up from this body the power ON, the temperature is always equal to or greater than a certain level at the time of warm-up is complete.

That is, when the recording paper passes through the fixing device, the paper input guide can hold a sufficient amount of heat on the back surface of the recording paper to perform effective preheating. Problems can be prevented.

[0062] According to the fixing temperature control method according to claim 2, or the body becomes a wait state in a low temperature environment, or even an attempt to start the printing operation after the wait state is continued for a long time, if, If the temperature of the paper input guide is lower than the predetermined temperature, the printable state is temporarily inhibited, and after performing the temperature control according to claim 1, the printable state is returned to the printable state. Since it is always above a certain level, the paper input guide can always hold a sufficient amount of heat for effective preheating on the back surface of the recording paper, so that effective preheating can be performed on the back surface of the recording paper. Therefore, it is possible to prevent the problem of fixing failure due to insufficient preheating.

[0063] According to the fixing temperature control method according to claim 3, wherein, the multi-printing of a large amount, even if excessive temperature drop of Nyukami guide, once interrupted multi printing, the temperature control of claim 1, wherein After printing, the multi-printing is started again, so the temperature of the paper input guide during printing is always at a certain level or more, and the paper input guide can always perform effective preheating on the back side of the recording paper. Since the amount of heat can be held, effective preheating can be performed on the back surface of the recording paper. Therefore, it is possible to prevent the occurrence of a problem of fixing failure due to a drop in the temperature of the paper input guide due to multi-printing.

[0064] According to the fixing temperature control method according to claim 4, wherein, etc. If the machine jam process is performed at a relatively high temperature or when a short time, Nyukami temperature of the guide is relatively high, the recording paper back surface In the case where the amount of heat sufficient to perform the effective preheating can be maintained, the problem of defective fixing does not occur even if the temperature control according to claim 1 or 2 is not performed. In addition, this control does not rotate the fixing belt during recovery, so that the jam recovery time can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a printer according to an embodiment of the present invention.

FIG. 2 illustrates a method 1 to a method 4 according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a configuration of a fixing device corresponding to FIG.

FIG. 3 shows the relationship between the temperature of the heating roller side of the fixing belt and the temperature of the paper input guide at the time of warm-up after the power of the main body is turned on, corresponding to the method 1 in the embodiment of the present invention. FIG.

FIG. 4 is a diagram illustrating a relationship between the temperature of the heating roller side of the fixing belt and the time of the paper input guide at the time of warming up from a wait state, corresponding to Method 2 in one embodiment of the present invention. It is.

FIG. 5 shows the relationship between the temperature on the heating roller side of the fixing belt and the time of the paper input guide at the time of warm-up from a multi-printing state, corresponding to Method 3 in one embodiment of the present invention. FIG.

FIG. 6 is a diagram showing the relationship between the temperature of the heating roller side of the fixing belt and the time of the paper input guide at the time of recovery from jam processing, corresponding to Method 4 in one embodiment of the present invention. is there.

FIG. 7 is a flowchart of heater lamp temperature control corresponding to Method 1 to Method 4 in the embodiment of the present invention.

FIG. 8 is a diagram illustrating a configuration of a conventional fixing device.

FIG. 9 is a diagram showing the relationship between the temperature of the heating roller side of the fixing belt and the time of the temperature of the paper input guide at the time of warm-up after the power of the main body of the related art is warmed up.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer 20 Fixing device 21 Fixing belt 22 Paper input guide 23 Heating roller 24 Fixing roller 25 Pressure roller 26 Heater lamp 27 Nip part 28 Tension roller 31 Recording paper 35 Thermistor A 36 Thermistor B

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masao Yamamoto 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-6-318001 (JP, A) JP-A-59- 231571 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 13/20 G03G 15/20

Claims (4)

(57) [Claims] 1. A heating roller provided with a heater lamp,
Endless fixing belt stretched between fixing roller
And fixing the fixing roller from below through the fixing belt.
A pressure roller for applying pressure, and the fixing belt
And an upstream side of a nip formed by the pressure roller
A substantially linear shape is provided at a position close to and below the fixing belt.
Nyukami guides provided, second temperature, which is disposed in a position where it abuts on the abutting said <br/> Nyukami guide back surface and arranged first temperature sensing element located in the fixing belt in the heating roller side Inspection
The temperature at two places in the fixing device can be detected by the knowledge element
A fixing temperature control method in the fixing device of the belt type, the fixing belt begins at the stop state temperature control of the heater lamp after a certain time has passed, starts rotation of the fixing belt, the second temperature sensing the temperature of the Nyukami guide detected by the element, at the time the temperature reaches a certain temperature, the rotation of the <br/> fixing belt stops, and the temperature of the first temperature sensing element at that time is constant if I reach the temperature, the warm-up completion, otherwise, continue heating until a constant temperature, then the warm-up completion, on the heat <br/> Taranpu - off control the first temperature sensing A fixing temperature control method performed by the temperature of the element. 2. A heating roller provided with a heater lamp,
Endless fixing belt stretched between fixing roller
And fixing the fixing roller from below through the fixing belt.
A pressure roller for applying pressure, and the fixing belt
And an upstream side of a nip formed by the pressure roller
A substantially linear shape is provided at a position close to and below the fixing belt.
Nyukami guides provided, second temperature, which is disposed in a position where it abuts on the abutting said <br/> Nyukami guide back surface and arranged first temperature sensing element located in the fixing belt in the heating roller side Inspection
The temperature at two places in the fixing device can be detected by the knowledge element
A fixing temperature control method for a belt-type fixing device , comprising:
The Nyukami guide advance by detecting the temperature, if the temperature is below a predetermined temperature, the fixing belt starts temperature control of the heater <br/> Taranpu at standstill, after a predetermined time, the <br /> starts the rotation of the fixing belt, previously in the second temperature sensing element
Detecting the temperature of the serial Nyukami guide, at the time the temperature reaches a certain temperature, the rotation of the fixing belt stops, I have and temperature before Symbol first temperature sensing element at that point reaches a certain temperature if, as a warm-up period, otherwise, continue heating until a constant temperature, then the warm-up completion, on of the heater lamp - off control the
A fixing temperature control method performed based on the temperature of the first temperature detecting element. 3. A heating roller provided with a heater lamp,
Endless fixing belt stretched between fixing roller
And fixing the fixing roller from below through the fixing belt.
A pressure roller for applying pressure, and the fixing belt
And an upstream side of a nip formed by the pressure roller
A substantially linear shape is provided at a position close to and below the fixing belt.
Nyukami guides provided, second temperature, which is disposed in a position where it abuts on the abutting said <br/> Nyukami guide back surface and arranged first temperature sensing element located in the fixing belt in the heating roller side Inspection
The temperature at two places in the fixing device can be detected by the knowledge element
A fixing temperature control method in the fixing device of the belt type, when the multi-print operation, always keep detecting the temperature of the <br/> Nyukami guide at the second temperature sensing element, falls below the temperature constant temperature if, interrupts the printing operation, the fixing belt starts temperature control of the heater lamp at standstill, after a predetermined time, to start the rotation of the fixing belt, the Nyukami guide at the second temperature sensing element detecting the temperature, at the time the temperature reaches a certain temperature, to stop the rotation of the fixing belt, and if my temperature of the first temperature sensing element at that time has reached a predetermined temperature, the warm-up ends and then, if not, continue heating until a constant temperature, and then warm-up completion, on of the heater lamp -
A fixing temperature control method in which the off control is performed based on the temperature of the first temperature detecting element. 4. A heating roller provided with a heater lamp,
Endless fixing belt stretched between fixing roller
And fixing the fixing roller from below through the fixing belt.
A pressure roller for applying pressure, and the fixing belt
And an upstream side of a nip formed by the pressure roller
A substantially linear shape is provided at a position close to and below the fixing belt.
Nyukami guides provided, second temperature, which is disposed in a position where it abuts on the abutting said <br/> Nyukami guide back surface and arranged first temperature sensing element located in the fixing belt in the heating roller side Inspection
The temperature at two places in the fixing device can be detected by the knowledge element
A fixing temperature control method in the fixing device of the belt type, the temperature control at the time of recovery from jam processing, and starts the temperature control of the heater lamp by the fixing belt stopped, after a predetermined time, the second temperature the temperature of the Nyukami guide and detected by the detection element, the temperature has reached a predetermined temperature, if I have and temperature of the first temperature sensing element at that point reaches a certain temperature, the recovery completion, so if, continued heating until a constant temperature, then a recovery completion, on of the heater lamp - off control
A fixing temperature control method performed based on the temperature of the first temperature detecting element.