JP2002341693A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus which can satisfactorily carry out processing of a recording medium which causes transportation trouble even if the trouble occurs in a thermal fixing device and the predetermined time passes since occurrence of the trouble. SOLUTION: The image forming apparatus is provided with an entrance sensor 23 and an exit sensor 24 for detecting jam of a paper sheet 3 in the fixing part 11 of a laser printer 1, a jam occurrence lamp 59 which announces the jam of the paper sheet 3, and a heater 29 for heating a heating roll 21. The image forming apparatus is controlled by a jam control program so that the jam is announced by the lamp 59 when the jam is detected and that the heating roll 21 is heated by the heater 29 at the prescribed holding temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a laser printer.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a laser printer, a thermal fixing device for thermally fixing a developer transferred from a photosensitive drum is provided. Such a heat fixing device generally includes a heating roller heated by a heater, and a pressing roller disposed to face the heating roller and pressed toward the heating roller. The developer on the paper is heat-fixed when passing through the space.

[0003] In such an image forming apparatus, when a paper jam occurs in the fixing device, the power supply to the heater of the heating roller is usually cut off until the jam processing is completed. Is controlled.

[0004]

However, in such a control, the energization of the heater of the heating roller is interrupted when a jam occurs. Therefore, if the jam processing is not performed immediately after the occurrence of the jam, the heating roller cannot be heated. As a result, the temperature of the developer drops and the developer hardens, causing a problem that the heating roller and the paper are firmly adhered to each other. In such a case, the jam processing becomes extremely difficult, and if the sheet is forcibly peeled, the heating roller is damaged.

On the other hand, in recent years, with the spread of network printers and the like, even if a jam occurs in an image forming apparatus, the jam processing is often not performed immediately.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a heat fixing device that can perform a transfer operation properly even if a predetermined time has elapsed after the occurrence of the transfer failure. It is an object of the present invention to provide an image forming apparatus capable of performing processing on a recording medium having a conveyance failure.

[0007]

According to an aspect of the present invention, there is provided an image forming apparatus including a fixing device having a heating member for thermally fixing a developer on a recording medium. The fixing device includes a conveyance failure detection unit for detecting a conveyance failure of the recording medium, a conveyance failure notification unit for notifying the conveyance failure, and a heating unit for heating a heating member. When a transport failure is detected, the transport failure notification unit reports the transport failure and the heating unit controls the heating member to be heated at a predetermined temperature. It is characterized by:

According to such a configuration, when a defective transport is detected by the defective transport detecting means, the defective transport is reported by the defective transport notification means and the heating member is heated at a predetermined temperature by the heating means. Is controlled. Thus, the temperature of the heating member is prevented from lowering, so that the adhesion between the heating member and the recording medium due to the solidification of the developer can be effectively prevented. Therefore, even if a predetermined time has elapsed since the occurrence of the conveyance failure, the user who received the notification can easily and easily remove the recording medium having the conveyance failure without damaging the heating member. It can be performed reliably.

According to a second aspect of the present invention, there is provided an image forming apparatus including a fixing device having a heating member for thermally fixing a developer on a recording medium, wherein a conveyance failure of the recording medium in the fixing device is detected. And a cover for removing a recording medium having a conveyance failure in the fixing device, wherein the conveyance failure is detected by the conveyance failure detection means. Is detected, and when the opening / closing cover is opened, a conveyance failure control means for controlling the heating means to heat the heating member at a predetermined temperature by the heating means is provided.

According to such a configuration, when the transport failure is detected by the transport failure detection means and the opening / closing cover is opened, the heating member is controlled so as to be heated at a predetermined temperature by the heating means. Therefore, when trying to remove the recording medium having the conveyance failure, it is possible to reliably prevent the adhesion between the heating member and the recording medium due to the solidification of the developer. Therefore, the user can easily and reliably remove the recording medium in which the conveyance failure has occurred.

According to a third aspect of the present invention, there is provided an image forming apparatus including a fixing device having a heating member for thermally fixing a developer on a recording medium, and detects a conveyance failure of the recording medium in the fixing device. A conveyance failure detecting unit for heating the heating member, and an opening / closing cover for removing a recording medium having a conveyance failure in the fixing device, wherein the opening / closing cover is closed, And, when the detection of the defective transport by the defective transport detection means is maintained, the defective transport control means for controlling the heating means to heat the heating member at a predetermined temperature is provided. Features.

According to such a configuration, the heating member is heated by the heating means at a predetermined temperature when the opening / closing cover is closed and the conveyance failure detection means maintains the detection of the conveyance failure. Controlled. Therefore, for example, when the operation of removing the recording medium having a transport failure is unknown and the opening / closing cover is once closed, when the recording medium having the transport failure is removed again,
Since the temperature of the heating member is prevented from lowering, it is possible to easily and surely remove the recording medium having the conveyance failure.

The invention described in claim 4 is the first invention.
In the invention according to any one of (1) to (3), the conveyance failure control unit controls the heating member by the heating unit.
The heating is controlled at the predetermined temperature for a predetermined time.

According to such a configuration, the heating member is heated by the heating means for a predetermined time. That is, since the heating member is not heated by the heating means after the elapse of a predetermined time, it is possible to prevent damage to the device due to heating for a long time, and to prevent excessive heating and to improve safety. Improvement can be achieved.

The invention described in claim 5 is the first invention.
5. The invention according to any one of claims 4 to 4, further comprising a processable notifying unit for notifying that the recording medium having the conveyance failure can be removed, wherein the conveyance failure control unit includes the heating unit. The heating member to be heated,
When the temperature required for removing the recording medium having the conveyance failure has been reached, the processing possibility notifying means notifies that the recording medium can be removed.

According to such a configuration, the processable notifying means notifies that the recording medium can be removed, so that the user recognizes this and causes a conveyance failure at a certain timing. The recording medium can be removed. Therefore, erroneous operation of the user can be prevented, and an efficient operation of removing the recording medium having the conveyance failure can be achieved.

The invention described in claim 6 is the first invention.
In the invention according to any one of the above items (5) to (5), the apparatus further includes a processing impossible notification unit for notifying that the recording medium having the conveyance failure cannot be removed, and the conveyance failure control unit is heated by the heating unit. When the temperature of the heating member does not reach a temperature necessary for removing the recording medium having a conveyance failure, the processing non-availability notifying unit notifies that the recording medium cannot be removed. I have.

According to such a configuration, the processing-impossible notifying unit notifies that the recording medium cannot be removed, so that the user can recognize this and accurately grasp the state of the apparatus. Therefore, erroneous operation of the user can be prevented, and an accurate and reliable operation of removing the recording medium having the conveyance failure can be achieved.

The invention according to claim 7 is the first invention.
The invention according to any one of the first to sixth aspects, further comprising a heating unit operating state notifying unit for notifying an operating state and a non-operating state of the heating unit.

According to this configuration, the user can accurately and reliably grasp the operating state and the non-operating state of the heating means by the notification of the heating means operating state notification means. Therefore, erroneous operation by the user can be prevented, and safety can be improved.

The invention described in claim 8 is the first invention.
8. The invention according to any one of claims 7 to 7, further comprising a manual operation unit for manually operating the heating unit, wherein the conveyance failure control unit is configured to execute the heating unit when an input from the manual operation unit is received. Is controlled so as to heat the heating member at the predetermined temperature.

According to such a configuration, when the user operates the manual operation means, the conveyance failure control means controls the heating member to be heated at a predetermined temperature by the heating means. Therefore, it is possible to perform the operation of removing the recording medium having the conveyance failure at an arbitrary timing desired by the user.

The invention according to claim 9 is the first invention.
In the invention according to any one of (1) to (8), the conveyance failure control means includes:
It is characterized in that heating is performed at a temperature lower than the heat fixing temperature and equal to or higher than the temperature at which the developer starts flowing out.

According to this configuration, the heating member is heated by the heating means at a temperature lower than the heat fixing temperature and equal to or higher than the temperature at which the developer starts flowing out. Therefore, since the temperature is controlled at a temperature lower than the fixing temperature, damage to the apparatus due to excessive heating can be prevented and safety can be improved. On the other hand, since the temperature is controlled at a temperature equal to or higher than the outflow start temperature of the developer, the adhesion between the heating member and the recording medium due to the solidification of the developer can be reliably prevented, and the recording medium having a conveyance failure is removed. Can be performed simply and reliably.

The invention described in claim 10 is the invention according to any one of claims 1 or 3 to 9,
The fixing device further includes an opening / closing cover for removing a recording medium having a conveyance failure, and the conveyance failure control unit controls the operation of the heating unit to stop when the opening / closing cover is opened. It is characterized by doing.

According to such a configuration, when the opening / closing cover is opened, the operation of the heating means is stopped. For this reason, it is possible to improve safety when removing the recording medium in which the conveyance failure has occurred.

According to an eleventh aspect of the present invention, in the first aspect of the present invention, there is provided a cleaning means for cleaning the heating member, and the conveyance failure control means comprises When the detection of the conveyance failure by the conveyance failure detection means is canceled, the heating member is controlled to be cleaned by the cleaning means.

According to such a configuration, when the detection of the transport failure by the transport failure detecting means is canceled, that is, when the recording medium having the transport failure is removed, the cleaning of the heating member by the cleaning means is performed. Done. for that reason,
The heating member can satisfactorily fix the recording medium even in the subsequent image forming operation.

[0029]

FIG. 1 is a side sectional view showing a main part of an embodiment of a laser printer as an image forming apparatus according to the present invention. In FIG. 1, a laser printer 1 includes a feeder unit 4 for feeding a sheet 3 as a recording medium in a main body casing 2 and an image forming unit for forming a predetermined image on the fed sheet 3. And the like.

The feeder unit 4 includes a paper feed tray 6 detachably mounted on the bottom of the main body casing 2, a paper feed roller 7 provided above one end of the paper feed tray 6,
A registration roller 8 provided downstream of the paper feed tray 6 in the transport direction of the paper 3.

The paper 3 is fed one by one by the rotation of the paper feed roller 7 and sent to the registration rollers 8. The registration roller 8 is composed of a pair of rollers,
Is sent to the image forming section 5 after a predetermined registration.

The image forming unit 5 includes a scanner unit 9, a process unit 10, a fixing unit 11 as a fixing device, and the like.

The scanner unit 9 includes the main body casing 2
It is provided at the upper part of the inside, and includes a laser emitting unit (not shown), a polygon mirror, a plurality of lenses, a reflecting mirror, and the like. Then, a laser beam based on predetermined image data emitted from the laser emitting unit is passed or reflected through a polygon mirror, a reflecting mirror, and a lens, and is scanned at a high speed on a surface of a photosensitive drum 13 of a process unit 10 described later. Irradiation.

The process section 10 is disposed below the scanner unit 9 and includes a developing cartridge 12 and a photosensitive drum 1.
3, a scorotron charger 14, a transfer roller 15, and a drum cleaning unit 16.

The developing cartridge 12 is detachably mounted on the main body casing 2 and is provided with a developing roller 1.
7, a layer thickness regulating blade (not shown), a supply roller, a toner container, and the like.

The photosensitive drum 13 is disposed at a position lateral to the developing roller 17 so as to be rotatable in the direction of the arrow (clockwise) so as to be in contact with the developing roller 17.

The scorotron charger 14 is disposed above the photosensitive drum 13 at a predetermined interval so as not to contact the photosensitive drum 13. The scorotron charger 14 is a positive scorotron charger for generating corona discharge from a charging wire such as tungsten, and is configured to uniformly charge the surface of the photosensitive drum 13 to a positive polarity. ing.

The toner container of the developing cartridge 12 contains a non-magnetic one-component positively charged toner as a developer, and the toner is supplied to the developing roller 17 by the rotation of the supply roller. Then, the developing roller 1 is formed into a thin layer having a certain thickness by the layer thickness regulating blade.
7. On the other hand, when the surface of the photosensitive drum 13 is uniformly positively charged by the scorotron charger 14,
Next, the surface is exposed by high-speed scanning of a laser beam from the scanner unit 9 to form an electrostatic latent image based on predetermined image data. When the toner carried on the developing roller 17 comes into contact with the photosensitive drum 13 by the rotation of the developing roller 17, an electrostatic latent image formed on the surface of the photosensitive drum 13, that is, The surface of the photosensitive drum 13 which is positively charged as described above is supplied to a portion where the potential is lowered after being exposed to the laser beam, and is developed (visible image) by being selectively carried.

Below the photosensitive drum 13, a transfer roller 15 facing the photosensitive drum 13 is rotatably disposed, and a predetermined transfer bias is applied. Therefore, the visible image carried on the photosensitive drum 13 is transferred to the sheet 3 while the sheet 3 passes between the photosensitive drum 13 and the transfer roller 15.

The drum cleaning section 16 includes a drum cleaning roller 18, a cleaning blade 19 and a waste toner tank 20, and is located downstream of the transfer roller 15 in the rotation direction of the photosensitive drum 13 and upstream of the scorotron charger 14. Are located in

The drum cleaning roller 18 is arranged in contact with the photosensitive drum 13 so as to be in contact therewith, and a predetermined bias is applied. Then, the toner remaining on the photosensitive drum 13 after the transfer to the paper 3 is electrically captured by the drum cleaning roller 18 when the surface of the photosensitive drum 13 faces the drum cleaning roller 18, and then, by the cleaning blade 19. The toner is scraped off and collected in the waste toner tank 20.

The fixing unit 11 is disposed on the downstream side of the process unit 10 and has a heating roller 21 as a heating member, a pressing roller 22 for pressing the heating roller 21, an entrance sensor 23 as a conveyance failure detecting unit, and an exit. Sensor 24,
A temperature sensor 25, a peeling claw 26, a cleaning member 27 as cleaning means, and a pair of transport rollers 28 provided downstream of the heating roller 21 and the pressing roller 22 are provided.

The heating roller 21 is made of metal and has a heater 29 as heating means. The toner transferred onto the paper 3 in the process section 10 is used as the heating roller 2 by the heating roller 2.
1 and heat-fixed while passing between the pressing roller 22;
Thereafter, the paper 3 is transported to a pair of paper discharge rollers 30 by the transport rollers 28. The paper 3 sent to the paper discharge roller 30 is discharged onto a paper discharge tray 31 by the paper discharge roller 30.

Inlet sensor 23 and outlet sensor 24
Are arranged on the upstream and downstream sides of the heating roller 21 and the pressing roller 22 in the transport direction of the paper 3, respectively, and detect whether or not the paper 3 exists between the heating roller 21 and the pressing roller 22. Is configured to detect the presence or absence of a jam. That is, in the jam control program described later, the entrance sensor 23
The exit sensor 24 is turned on when the sheet 3 is present at those positions, and is turned off when the sheet 3 is not present.

The temperature sensor 25 detects the surface temperature of the heating roller 21 above the heating roller 21.

The peeling claw 26 is formed of a flat plate member having a wedge-shaped cross section, and its acute-angled end comes into contact with the surface of the heating roller 21 in a state facing the rotating direction of the heating roller 21, and the sheet 3 of the heating roller 21 It is configured to be separated from the surface.

The cleaning member 27 includes the heating roller 21
And are disposed opposite to the side of the pressing roller 22, respectively.
It is configured as an eccentric roller. In the jam control program described later, after the jam is cleared, the heating roller 21 or the pressing roller 2 is driven to rotate by a cleaning member driving circuit 56 described later.
The surface and the surface of the heating roller 21 and the pressing roller 22 are cleaned by contacting and separating the surface.

At the rear of the main body casing 2 of the laser printer 1, an opening / closing cover 33 is provided so as to be openable and closable as shown by the phantom line in FIG. That is, the opening / closing cover 33 is opened and closed in the front-rear direction with the hinge portion 32 provided at the lower portion of the main body casing 2 as a fulcrum, and when a jam of the paper 3 occurs in the fixing unit 11, the opening operation of the opening / closing cover 33 (opening). ), The paper 3 can be removed. A cover sensor 34 is provided inside the upper frame of the opening / closing cover 33. The cover sensor 34 detects the open / close state of the open / close cover 33.

FIG. 2 is a block diagram of a control system of the fixing unit 11. In FIG. 2, in the laser printer 1, C
The above-described inlet sensor 23, outlet sensor 24, temperature sensor 25, cover sensor 34, and operation switch 67 as manual operation means described later are connected to the PU 51, and also drives the heating roller 21 and the pressing roller 22. A main drive circuit 53 for controlling the driving of the first motor 52; a heater energizing circuit 54 for controlling the energization of the heater 29; and a cleaning member driving circuit 56 for controlling the driving of a second motor 55 for driving the cleaning member 27. And a display circuit 5 for controlling the display unit 57
8 are connected.

The CPU 51 has a RAM 64 and a ROM 6
5 for controlling each unit. The RAM 64 has an entrance sensor 23, an exit sensor 24, a temperature sensor 2
5, temporary numerical values from the cover sensor 34, the operation switches 67, and the like for driving and controlling the respective units are stored. The ROM 65 has various control programs such as a main drive control program for controlling the main drive circuit 53, the heater energizing circuit 54, the cleaning member drive circuit 56, and the display circuit 58, and a jam control program as a conveyance failure control means. Is stored.

The main drive circuit 53 includes a first motor 52
The first motor 52 is connected to the heating roller 21 and the pressing roller 2 via a gear train (not shown).
2 are connected. The drive or stop of the first motor 52 is controlled by the main drive control program stored in the ROM 65 of the CPU 51 via the main drive circuit 53. Therefore, the drive or stop of the rotation of the heating roller 21 and the pressing roller 22 is controlled by the main drive control program.

The heater 29 is connected to the heater energizing circuit 54.
The heating (on) or the stop (off) is controlled by a jam control program stored in the inside.

The cleaning member drive circuit 56 includes a second
The motor 55 is connected, and the cleaning member 27 is connected to the second motor 55 via a gear train (not shown). The drive or stop of the second motor 55 is controlled by a jam control program stored in the ROM 65 of the CPU 51 via the cleaning member drive circuit 56. Therefore, the cleaning member 27
The driving or stopping of the rotation is controlled by a jam control program.

The display section 57 includes a jam occurrence lamp 59 as a conveyance failure notifying means, a jam clearing lamp 60 as a processable notifying means, a jam clearing lamp 61 as a processing impossible notifying means, and a heating means operating state. A heater lamp 62 as a notification unit and a cover open lamp 63 are provided.

In the display unit 57, the jam occurrence lamp 5 is controlled by the jam control program stored in the ROM 65 of the CPU 51 via the display circuit 58.
9, jam clear lamp 60, jam clear lamp 61, heater lamp 62 and cover open lamp 6
Lighting (on) or turning off (off) of No. 3 is controlled.

The heater lamp 62 is turned on when the heater 29 is operating (actually, when energized by the on / off control, the same applies hereinafter), and when the heater 29 is not operating (actually, Is not turned on and off, and is not turned on when the power is not supplied. like this,
By turning on and off the heater lamp 62, the user can accurately and reliably grasp the operation state and non-operation state of the heater 29. Therefore, erroneous operation by the user can be prevented, and safety can be improved.

Next, with reference to the schematic flowchart shown in FIG. 3, first, an outline of a procedure for detecting a jam and controlling the fixing unit 11 by the jam control program will be described.

In the following terms, the fixing temperature (TH) indicates a control temperature of the heating roller 21 during a normal heat fixing process. Further, the holding temperature (Tm) indicates a control temperature at the time of jam processing in the heating roller 21 and is higher than the toner outflow start temperature (Tfb) and the fixing temperature (Tfb).
The temperature is lower than H). In this laser printer 1, for example, TH = 180 ° C., Tfb =
The temperature is set at 105 ° C. and Tm = 120 ° C., but can be arbitrarily set according to the characteristics of the toner. Also,
The outflow start temperature (Tfb) is the outflow start temperature at which the toner flows out in the temperature raising method, and can be measured using, for example, a capillary rheometer (Shimadzu flow tester CFT-500C).

In FIG. 3, according to the jam control program, first, when print data is input (S1), the heater 29 operates to heat the heating roller 21 to the fixing temperature (TH).
(S2). Next, a printing process is executed (S3), and when a jam of the paper 3 is detected (S4), the heating roller 21 is automatically controlled at the holding temperature (Tm) (S5), and a predetermined time has elapsed. Thereafter, the operation of the heater 29 is turned off (S6). Thereafter, when the user manually operates the operation switch 67 to input a re-operation instruction to the heater 29 (S7), the heating roller 2
1 is controlled again by the operation of the heater 29 at the holding temperature (Tm) (S8), and after a predetermined time has passed, the heater 29 is controlled.
Is turned off (S6).

In the jam control program, when the opening / closing cover 33 is opened (S9) as an interruption process in step 5, step 6 or step 8, the heating roller 21 is activated by the operation of the heater 29.
Is automatically controlled at the holding temperature (Tm) (S10), and after a predetermined time has elapsed, the operation of the heater 29 is turned off (S11). Further, similarly to the above, the heater 29
When the re-operation instruction is input (S12), the heating roller 21 is again controlled at the holding temperature (Tm) by the operation of the heater 29 (S13).

When the cover 33 is opened (S9), the operation of the heater 29 may be turned off (S14) in consideration of the safety of the user. At this time, since the temperature of the heating roller 21 falls immediately compared with the case where the temperature is controlled by the holding temperature (Tm) (S10), it is preferable to set the fixing temperature (TH) higher.

Then, in any of step 10, step 11, step 13 or step 14,
When the opening / closing cover 33 is closed (S1)
5) When the jam is unprocessed (S16), the heating roller 29 operates the heating roller 21 again to maintain the holding temperature (T
m) (S5). On the other hand, when the cover 33 is closed (S15) and when the jam is being processed (S17), the heat roller 2
After the cleaning process and the reprint start process of the first roller 1 and the pressing roller 22 are performed (S18), the heating roller 21
Is controlled by the fixing temperature (TH) (S2).

Next, the control procedure according to the jam control program will be described in detail with reference to the flowcharts shown in FIGS.

In the following terms, the inter-sensor transport time (Tf) indicates the time required for the leading edge of the paper 3 to be transported from the inlet sensor 23 to the outlet sensor 24 in normal transport of the paper 3. The paper length transport time (Tp) indicates the time required for the paper sensor 3 and the outlet sensor 24 to be transported from the leading edge to the trailing edge of the paper 3 in normal paper transport.

The holding time (Tb) is determined by the heating roller 2
1 indicates a time for maintaining the temperature at the holding temperature (Tm). In the laser printer 1, the time is set to about 2 minutes.
For example, it can be set as an arbitrary time of about 1 to 15 minutes.

Further, all the timers (the first timer T
The first to third timers T3) are always reset immediately before the timer starts.

In this jam control program, first, in FIG. 4, when printing is started, the heating roller 21 is controlled at the fixing temperature (TH), and (S2).
1) The printing process is executed (S22). When the sheet 3 reaches the fixing unit 11, a fixing jam detection process (S23) for detecting a jam in the fixing unit 11 is performed. That is, the fixing jam detection process (S2
In 3), first, the state of the entrance sensor 23 is determined (S24). The entrance sensor 23 maintains the off state (S24: NO) until the paper 3 is conveyed,
Is turned on (S24: YES), and the first timer T1 is started (S25).

Next, it is determined whether or not the time of the first timer T1 exceeds the inter-sensor transfer time (Tf) (S26). If the first timer T1 has not exceeded the inter-sensor transfer time (Tf) (S26: NO), the state of the exit sensor 24 is determined (S27). The exit sensor 24 maintains the off state (S27: NO) until the paper 3 is conveyed, and again the first timer T1
Is determined to be longer than the inter-sensor transfer time (Tf) (S26). On the other hand, when the sheet 3 is conveyed to the exit sensor 24, the exit sensor 24 is turned on (S
27: YES), the second timer T2 starts (S
28).

Next, it is determined whether or not the time of the first timer T1 exceeds the sheet length transport time (Tp) (S).
29). The first timer T1 is the paper length transport time (Tp)
If not exceeded (S29: NO), the state of the entrance sensor 23 is determined (S30). Inlet sensor 2
When 3 is ON (S30: NO), it is determined again whether the first timer T1 has exceeded the sheet length transport time (Tp) (S29). When the entrance sensor 23 is off (S30: YES), it is subsequently determined whether or not the second timer T2 has exceeded the paper length transport time (Tp) (S31).

Next, if the second timer T2 has not exceeded the paper length transport time (Tp) (S31: NO),
The state of the exit sensor 24 is determined (S32). When the exit sensor 24 is ON (S32: NO), it is determined again whether or not the second timer T2 has exceeded the paper length transport time (Tp) (S31). When the outlet sensor 24 is off (S32: YES), the first timer T1 and the second timer T2 are reset (S33), and the heater 2
The operation of Step 9 is turned off (S34), and the printing is terminated.

That is, in the processing when no jam occurs in the fixing unit 11, when printing is started, the heating roller 21 is controlled at the fixing temperature (TH), and the printing processing is executed. At this time, the leading end of the paper 3 passes through the entrance sensor 23 and is conveyed to the exit sensor 24 within a predetermined time, and the rear end of the paper 3 sequentially passes through the entrance sensor 23 and the exit sensor 24 within a predetermined time. If you pass, the first
The timer T1 and the second timer T2 are reset,
The operation of the heater 29 is turned off, and printing ends.

On the other hand, when the exit sensor 24 is off, and
When the first timer T1 exceeds the inter-sensor transport time (Tf) (S26: YES), the entrance sensor 23 is turned on, and the first timer T1 determines that the paper length transport time (Tf) has elapsed.
p) (S29: YES) or the exit sensor 2
4 is on and the second timer T2 exceeds the paper length transport time (Tp) (S31: YES), the paper 3
Is determined to have occurred, and the processing shifts to the processing shown in FIG.

That is, the state where it is determined that such a jam has occurred means that the sheet 3 conveyed to the fixing unit 11 is not fixed even after the predetermined time (time corresponding to Tf) has passed.
1, or the paper 3 conveyed to the fixing unit 11 still stays in the fixing unit 11 after a predetermined time (time corresponding to Tp), or The sheet 3 conveyed to the vicinity of the exit of the fixing unit 11 is still in the vicinity of the exit of the fixing unit 11 even after a predetermined time (time corresponding to Tp). When judged,
Next, the process proceeds to the process shown in FIG.

That is, when it is determined that a paper jam has occurred (S26: YES, S29: YES, S
31: YES), as shown in FIG. 5, first, it is determined whether or not the entrance sensor 23 and / or the exit sensor 24 are in the ON state (S41).

Next, when the entrance sensor 23 and / or the exit sensor 24 are on (S41: YES), the on state of the entrance sensor 23 and / or the exit sensor 24 is stored (S42). On the other hand, when the entrance sensor 23 and the exit sensor 24 are off (S41: NO), the off state of the entrance sensor 23 and the exit sensor 24 is stored (S43). Then, in both cases,
The jam occurrence lamp 59 is turned on (S44) to notify that a jam has occurred in the fixing unit 11, and a temperature control process is performed when the opening / closing cover 33 is closed (S4).
5).

When the closing temperature control process (S45) is executed, it is first determined whether the temperature of the heating roller 21 exceeds the holding temperature (Tm) (S46).
When the temperature of the heating roller 21 exceeds the holding temperature (Tm) (S46: YES), the jam-capable lamp 60 is turned on (S47), and it is notified that the jam can be cleared. Then, control is started so that the temperature of the heating roller 21 becomes the holding temperature (Tm) by the operation of the heater 29 (S48), and the third timer T3 is started (S4).
9) Thereafter, it is determined whether or not the time of the third timer T3 has exceeded the holding time (Tb) (S50). When the third timer T3 has not exceeded the holding time (Tb) (S5
0: NO), it is determined that the opening / closing cover 33 is open (S5).
1) If the open / close cover 33 is opened (S51: Y
ES), the cover open routine process is started (S)
80). On the other hand, if the opening / closing cover 33 is not opened (S51: NO), it is determined again whether the third timer T3 has exceeded the holding time (Tb) (S50), and the third timer T3 sets the holding time (Tb). ) Is exceeded (S5
0: YES), the operation of the heater 29 is turned off (S5).
2) The jam clear lamp 60 is turned off and the jam clear lamp 61 is turned on (S5).
3). Then, the third timer T3 is stopped (S5
4).

As described above, in the laser printer 1, when a jam is detected by the entrance sensor 23 and the exit sensor 24 by the jam control program (S26: YES, S29: YES, S31: Y).
ES), the occurrence of a jam is notified by turning on the jam occurrence lamp 59 (S44), and the heating roller 21 is controlled to be heated at the holding temperature (Tm) by the operation of the heater 29. This prevents the temperature of the heating roller 21 from lowering, so that the adhesion between the heating roller 21 and the paper 3 due to solidification of the toner can be effectively prevented. Therefore, the user receiving the notification from the jam occurrence lamp 59 damages the heating roller 21 to remove the paper 3 having the jam even if a predetermined time has elapsed since the occurrence of the jam. This can be performed simply and reliably without any problem.

Further, according to this jam control program, when the heating roller 21 is at the holding temperature (Tm) necessary for removing the jammed sheet 3, the jam clear lamp 60 is turned on (S47). Thus, the user is notified that the paper 3 can be removed, and the user can recognize this and remove the jammed paper 3 at a reliable timing. Therefore, an erroneous operation of the user can be prevented, and an efficient removal operation of the jammed sheet 3 can be achieved.

In this jam control program, the heating roller 21 is heated by the heater 29 at a temperature lower than the holding temperature (Tm), ie, lower than the fixing temperature (TH) and higher than the toner outflow start temperature (Tfb). Is controlled to be Therefore, since the temperature is controlled at a temperature lower than the fixing temperature (TH), the fixing unit 11 due to excessive heating is controlled.
Can be prevented and safety can be improved.
Further, since the temperature is controlled at a temperature equal to or higher than the toner outflow start temperature (Tfb), the adhesion between the heating roller 21 and the paper 3 due to the solidification of the toner can be reliably prevented, and the paper 3 having the jammed paper 3 Removal can be performed easily and reliably.

Further, in the jam control program, the heating roller 21 is heated by the heater 29 at the holding temperature (Tm) for a predetermined holding time (Tb). Thus, the heating roller 21 is not heated by the heater 29 after a predetermined holding time (Tb) has elapsed, so that damage to the apparatus due to heating for a long time can be prevented, and excessive heating can be performed. It is possible to improve the safety by preventing it.

In FIG. 9, a jam occurs in the printing process, and thereafter, the heating roller 21 is held for a holding time (Tb).
The state controlled by the holding temperature (Tm) is shown as a timing chart of each part. That is, in FIG. 9, in the printing process, the heating roller 21
Is controlled by the on / off control of the fixing temperature (TH). After the entrance sensor 23 is turned on, the exit sensor 24 is not turned on even after the inter-sensor transport time (Tf), and the jam is not detected. When it is determined to have occurred,
At the same time as the first motor 52 stops, the third timer starts, and the heating roller 21 turns on / off the heater 29 to maintain the temperature (Tm) for a predetermined holding time (Tb).
After that, the third timer T3 sets the holding time (T
When b) is exceeded, the heater 29 is turned off. Note that the jam-capable lamp 60 is controlled during the holding temperature (Tm) control.
After the holding time (Tb) elapses, the heater 2 is turned on.
When 9 is turned off, the jam clear lamp 61 is turned on.

Then, as shown in FIG. 5, after stopping the third timer T3 (S54), it is determined whether or not a restart instruction has been input to the heater 29 (S55). When the restart instruction is input (S55: YES), the third timer T3 is reset (S56), and the process returns to step 46 where it is determined again whether the temperature of the heating roller 21 exceeds the holding temperature (Tm). Return. On the other hand, when there is no input of the reactivation instruction (S55: NO), the process returns to step 51 for determining whether the opening / closing cover 33 is open.

As described above, in the laser printer 1, when the user operates the operation switch 67 and inputs a re-operation instruction, the heating roller 21 is operated again by the operation of the heater 29 by the jam control program and the holding temperature ( Tm), it is possible to perform the operation of removing the jammed sheet 3 at an arbitrary timing desired by the user.

On the other hand, when the temperature of the heating roller 21 does not exceed the holding temperature (Tm) (S46: NO), the jam clear lamp 61 is turned on (S57) and it is notified that the jam clear state is set. You. And the heater 29
Is activated (S58), and it is determined whether the cover 33 is open (S59). If the cover 33 is opened (S59: YES), the cover open routine (S8)
The process of 0) is started. On the other hand, if the opening / closing cover 33 is not opened (S59: NO), the process stands by until the temperature of the heating roller 21 exceeds the holding temperature (Tm) (S4).
6: NO, S57 to S59: NO) Then, as described above, the heating roller 21 is controlled for the holding time (Tb) at the holding temperature (Tm) (S47 to S54).

As described above, according to the jam control program, when the heating roller 21 has not reached the holding temperature (Tm) required to remove the jammed sheet 3, the jam clear lamp 61 is turned on (Tm). Since the notification that the paper 3 cannot be removed is notified by S57), the user can recognize this and accurately grasp the state of the fixing unit 11. Therefore, an erroneous operation of the user can be prevented, and an accurate and reliable removal operation of the jammed paper 3 can be achieved.

Next, a cover open routine (S80)
Will be described with reference to FIG. First, when this process is started, the opening of the open / close cover 33 is notified by turning on the cover open lamp 63 (S81),
Next, it is determined whether or not the temperature of the heating roller 21 exceeds the holding temperature (Tm) (S82). Heating roller 2
1 is higher than the holding temperature (Tm) (S8
2: YES), the jam clear lamp 60 is turned on (S83), and it is notified that the jam can be cleared.
Then, by the operation of the heater 29, the temperature of the heating roller 21 is controlled at the holding temperature (Tm) (S84), and after the third timer T3 is started (S85), the time of the third timer T3 is the holding time (Tb). Is determined (S86). The third timer T3 has a holding time (T
If the value does not exceed b) (S86: NO), it is determined that the open / close cover 33 is closed (S87).
Is closed (S87: YES), the cover open lamp 63 is turned off (S88) to open and close the cover 33.
Is notified, and the cover open routine ends. On the other hand, when the third timer T3 exceeds the holding time (Tb) (S86: YES), the operation of the heater 29 is turned off (S92), the jam clear lamp 60 is turned off, and the jam clear lamp 61 is turned off. Is turned on (S93). Then, the third timer T3 is stopped (S94), and it is determined whether or not there is a restart instruction to the heater 29 (S95). If there is a restart instruction (S95: YE
S), the third timer T3 is reset (S96), and the process returns to step 82 where it is determined again whether the temperature of the heating roller 21 exceeds the holding temperature (Tm). On the other hand, when there is no re-operation instruction (S95: NO), the process returns to step 87 for determining whether the open / close cover 33 is closed again.

On the other hand, when the temperature of the heating roller 21 does not exceed the holding temperature (Tm) (S82: NO), the jam clear lamp 60 is turned on (S89) to notify that the jam cannot be cleared. Then, the heater 29 is operated (S90), and the closing of the open / close cover 33 is determined (S91). When the cover 33 is closed (S91: YES), the process proceeds to step 88 where the cover open lamp 63 is turned off. When the cover 33 is open (S91: NO), the heating roller is again turned on. The process returns to step 82 where it is determined whether the temperature of 21 exceeds the holding temperature (Tm).

FIG. 10 shows that when the temperature of the heating roller 21 does not exceed the holding temperature (Tm), the opening / closing cover 3
3 is opened, and the heating roller 21 is held for a holding time (Tb).
The state controlled by the holding temperature (Tm) is shown as a timing chart of each part. That is, in FIG. 10, when the opening / closing cover 33 is opened, the heater 29 is operated by on / off control, and when the temperature of the heating roller 21 exceeds the holding temperature (Tm), the third timer T3
Starts, and the heating roller 21 is kept for a predetermined holding time (T
b) It is controlled by the holding temperature (Tm). Third timer T3
Exceeds the holding time (Tb), the operation of the heater 29 is turned off. Note that the jam clearable lamp 60 is turned on during the holding temperature (Tm) control, and the jam clearable lamp 61 is turned on before and after the holding temperature (Tm) control.

As described above, in the jam control program,
When the opening / closing cover 33 is opened to remove the paper 3 having a jam in the fixing unit 11, the opening of the opening / closing cover 33 is notified by turning on the cover open lamp 63 (S <b> 81) and the operation of the heater 29. Is controlled so that the heating roller 21 is heated at the holding temperature (Tm) (S84), so that when the jammed paper 3 is to be removed, the toner is solidified due to a decrease in the temperature of the heating roller 21. Thus, the adhesion between the heating roller 21 and the sheet 3 due to the above can be reliably prevented. Therefore, the user can easily and surely remove the jammed paper 3.

When the cover 33 is opened,
For safety, the operation of the heater 29 may be turned off. FIG. 7 shows a process of a cover open routine for turning off the operation of the heater 29 when the opening / closing cover 33 is opened. In FIG. 7, the jam-capable temperature (T) for judging whether or not the jam is possible.
n) is lower than the above-mentioned holding temperature (Tm), and
It is set as a temperature higher than the outflow start temperature (Tfb). Then, as shown in FIG. 7, when the process of the cover open routine is started, the opening of the open / close cover 33 is notified by turning on the cover open lamp 63 (S101), and the operation of the heater 29 is turned off (S10).
2). Then, it is determined whether or not the temperature of the heating roller 21 has exceeded the jam-removable temperature (Tn) (S10).
3). The temperature of the heating roller 21 becomes equal to the jam-removable temperature (T
When n is exceeded (S103: YES), the jam clear lamp 60 is turned on (S104), and it is notified that the jam can be cleared.

On the other hand, when the temperature of the heating roller 21 does not exceed the jam-removable temperature (Tn) (S103: N
O), the jam clear lamp 61 is turned on (S10).
6) It is notified that the jam cannot be cleared. Then, it is determined whether the cover 33 is closed (S10).
5) When the opening / closing cover 33 is not closed (S
105: NO), the above processing (S103, S104, and S105) is repeated, and when the open / close cover 33 is closed (S105: YES), the cover open lamp 63 is turned off and the close of the open / close cover 33 is notified. End the cover open routine.

When the cover open routine shown in FIG. 7 is executed, the holding temperature (Tm) at step 45 is determined by taking into account the temperature decrease of the heating roller 21 after the opening and closing cover 33 is opened. Opening / closing cover 3 as shown in FIG.
It is preferable to set the heating roller 21 to a temperature higher by about 10 to 20 ° C. than in the case where the heating roller 21 is controlled at the holding temperature (Tm) at the time of opening 3.

As described above, in the jam control program, as shown in the cover open routine shown in FIG.
If the operation of the heater 29 is controlled to be turned off when the opening / closing cover 33 is opened, the jammed paper 3
The safety at the time of removing can be improved.

In the above cover open routine (S80), whether or not the jam has been cleared by the user or whether or not the jam has been cleared is determined after returning to the main process as shown in FIG. Is determined. That is, after the cover open routine (S80) ends, as shown in FIG. 8, first, it is determined whether or not both the entrance sensor 23 and the exit sensor 24 are off (S71). If either the inlet sensor 23 or the outlet sensor 24 is not off (S71: N
O), the temperature control process when the cover is closed shown in FIG. 5 (S
45) is executed again. That is, in this case, it is determined that at least one of the entrance sensor 23 and the exit sensor 24 is in the ON state, the paper 3 is staying in the fixing unit 11, and the jam is not processed.
Therefore, the temperature control process when the cover is closed again (S4
Return to 5).

As described above, according to the jam control program, when the open / close cover 33 is closed (S8).
7: YES), the cover open lamp 63 is turned off (S8)
8), the closed state of the opening / closing cover 33 is notified, and the entrance sensor 23 and / or the exit sensor 24 are notified.
When the detection of the jam due to is maintained (S71:
NO), the process returns to the temperature control process when the cover is closed (S45), and the heating roller 21 is actuated again by the operation of the heater 29.
Is controlled to be heated at the holding temperature (Tm). Therefore, for example, even if the operation for removing the paper 3 having the jam is unknown and the opening / closing cover 33 is once closed, when the paper 3 having the jam has to be removed again,
Since the temperature of the heating roller 21 is prevented from lowering, the jammed paper 3 can be easily and reliably removed.

FIG. 11 shows that when the cover 33 is closed and the jam is unprocessed after the cover 33 is opened, the heating roller 2 is closed.
The state where 1 is controlled by the holding time (Tb) and the holding temperature (Tm) is shown as a timing chart of each unit. That is, in FIG. 11, when the open / close cover 33 is opened, the third timer T3 is started when the temperature of the heating roller 21 exceeds the holding temperature (Tm) by the on / off control of the heater 29, and the heating roller 21 is controlled by a predetermined holding time (Tb) and a holding temperature (Tm). afterwards,
When the opening / closing cover 33 is closed and the jam is in an untreated state, when the temperature of the heating roller 21 exceeds the holding temperature (Tm), the third timer T3 is restarted again, and Until the time of the three timer T3 exceeds Tb, the heating roller 21 is controlled at the holding temperature (Tm). Note that the jam clearable lamp 60 is turned on during the holding temperature (Tm) control, and the jam clearable lamp 61 is turned on before and after the holding temperature (Tm) control.

As shown in FIG. 8, when both the entrance sensor 23 and the exit sensor 24 are off (S71: YES), the stored values of the entrance sensor 23 and the exit sensor 24 are turned off (step 43). It is determined whether or not the state is stored) (S72). When the stored values of the entrance sensor 23 and the exit sensor 24 are off (S72: YES), a confirmation message as to whether or not the jam has been cleared is displayed on the operation panel 66 (S73), and whether or not there is a confirmation operation from the user Is determined (S74). Whether the stored value of the entrance sensor and / or the exit sensor is ON (the state of step 42 is stored) (S72: N
O) or when there is a confirmation operation (S74: YE
S), the jam occurrence lamp 59 is turned off (S75), and the cleaning process is executed (S76). The confirmation operation from the user is performed by operating the operation switch 67, for example.

In step 74, the confirmation operation is requested from the user because, in terms of control, whether the entrance sensor 23 and the exit sensor 24 are off due to the completion of the jam processing, or Inlet sensor 23
It is not possible to determine whether the jammed sheet 3 remains unprocessed between the exit sensor 24 and the exit sensor 24. Therefore, in step 42 or step 43, the entrance sensor 23 and exit sensor 24 when the jam is detected are determined in advance. When the entrance sensor 23 and the exit sensor 24 are in the off state from the time of the occurrence of the jam (that is, when the state of step 43 is stored) based on the stored state, the user is jammed. This is because it is necessary to prompt the user to confirm whether or not the processing has been completed.
However, the control may be such that step 41 to step 43 and step 72 are not provided, and a confirmation operation (S73) is always required for the user.

On the other hand, if there is no confirmation operation within the predetermined time (S74: NO), it is determined that the jam has not been cleared, and the temperature control process when the cover is closed (S46) shown in FIG. 5 is executed again.

In the cleaning processing (S76) after the jam processing is performed, first, the temperature of the heating roller 21 is controlled to the fixing temperature (TH) (S77), and then the cleaning member 27 is operated (S78). By the operation of the cleaning member 27 coming into contact with and separating from the surfaces of the heating roller 21 and the pressing roller 22, the toner and the like adhered to the heating roller 21 and the pressing roller 22 due to the jam are cleaned. Then, after executing the reprint processing (reprint) (S79), the print processing (step 2) shown in FIG.
Return to 1).

As described above, in the jam control program, when the detection of the jam by the entrance sensor 23 and the exit sensor 24 is canceled, that is, when the paper 3 having the jam is removed, the heating roller 2
1 is cleaned by the cleaning member 27 (S7).
8), the heating roller 21 can satisfactorily fix the sheet 3 even in the subsequent printing process.

In the laser printer 1, lamps such as a jam occurrence lamp 59, a jam clear lamp 60, a jam clear lamp 61, a heater lamp 62, and a cover open lamp 63 are used as various notification means. For example, a buzzer or a sound alert that more surely recognizes the user may be used, or a message may be displayed on the screen of the personal computer. In addition, a plurality of notification means may be used in combination, such as a combination of a liquid crystal display device and a buzzer.

[0103]

As described above, according to the first aspect of the present invention, even if a predetermined time has elapsed since the occurrence of the transport failure, the user who received the notification can receive the transport failure. It is possible to easily and reliably remove the recording medium having caused the problem without damaging the heating member.

According to the second aspect of the present invention, it is possible to reliably prevent adhesion between the heating member and the recording medium due to solidification of the developer when removing the recording medium in which the conveyance failure has occurred. it can. Therefore, the user can easily and reliably remove the recording medium in which the conveyance failure has occurred.

According to the third aspect of the present invention, the operation of removing a recording medium having a transport failure is unknown, and even if the opening / closing cover is once closed, the removal of the recording medium having a transport failure again occurs thereafter. In this case, since the temperature of the heating member is prevented from lowering, it is possible to easily and reliably remove the recording medium having the conveyance failure.

According to the fourth aspect of the present invention, it is possible to prevent damage to the apparatus due to heating for a long time, and to prevent excessive heating to improve safety.

According to the fifth aspect of the present invention, it is possible to prevent an erroneous operation by a user and achieve an efficient operation of removing a recording medium having a conveyance failure.

According to the sixth aspect of the present invention, an erroneous operation by a user can be prevented, and an accurate and reliable operation of removing a recording medium having a conveyance failure can be achieved.

According to the invention described in claim 7, erroneous operation by the user can be prevented, and safety can be improved.

According to the eighth aspect of the present invention, it is possible to perform the operation of removing the recording medium having the conveyance failure at an arbitrary timing desired by the user.

According to the ninth aspect, since the temperature is controlled at a temperature lower than the fixing temperature, it is possible to prevent damage to the apparatus due to excessive heating and to improve safety. On the other hand, since the temperature is controlled at a temperature equal to or higher than the outflow start temperature of the developer, the adhesion between the heating member and the recording medium due to the solidification of the developer can be reliably prevented, and the recording medium having a conveyance failure is removed. Can be performed simply and reliably.

According to the tenth aspect of the present invention, it is possible to improve safety when removing a recording medium having a conveyance failure.

According to the eleventh aspect, in the image forming operation after the cleaning of the heating member by the cleaning means, the recording medium can be fixed satisfactorily.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of an embodiment of a laser printer as an image forming apparatus of the present invention.

FIG. 2 is a block diagram of a control system of a fixing unit of the laser printer shown in FIG.

FIG. 3 is a schematic flowchart of a jam control program of the laser printer shown in FIG. 1;

FIG. 4 is a flowchart of a jam control program of the laser printer shown in FIG. 1;

FIG. 5 is a flowchart of the jam control program following FIG. 4;

FIG. 6 is a flowchart showing processing of a cover open routine (controlling a heater at a holding temperature when the cover is opened).

FIG. 7 shows another embodiment of the cover open routine (when the cover is opened, the operation of the heater is turned off).
FIG.

FIG. 8 is a flowchart of the jam control program following FIG. 4 to FIG. 7;

FIG. 9 is a timing chart of each part in a state where a jam occurs in the printing process and thereafter the heating roller is controlled by a holding time (Tb) and a holding temperature (Tm).

FIG. 10 is a timing chart of each part in a state where the opening and closing cover is opened and the heating roller is controlled by a holding time (Tb) holding temperature (Tm) when the temperature of the heating roller does not exceed the holding temperature (Tm). It is.

FIG. 11 is a timing chart of each part in a state in which the heating roller is controlled by the holding time (Tb) and the holding temperature (Tm) when the opening and closing cover is closed after the opening and closing cover is opened and the jam is unprocessed. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser printer 3 Paper 11 Fixing part 21 Heating roller 23 Inlet sensor 24 Outlet sensor 27 Cleaning member 29 Heater 33 Opening / closing cover 59 Jam occurrence lamp 60 Jam clear lamp 61 Jam clear lamp 62 Heater lamp 67 Operation switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) G03G 21/00 386 G03G 21/00 386 500 500 F term (reference) 2H027 DA12 DA36 DC14 EA12 EC20 ED16 ED25 EE07 EF09 EK09 GB06 2H033 AA37 AA42 BA30 BA39 BA49 BA57 BA58 CA06 CA07 CA22 CA34 CA57 2H072 AA16 AA22 AB20 AB27 CA01 CB08 EA01 3F048 AA02 AB01 BA05 BB02 CB05 CC01 DA06 DB07 DC03

Claims (11)

[Claims] 1. An image forming apparatus comprising a fixing device having a heating member for thermally fixing a developer on a recording medium, comprising: a conveyance failure detecting unit for detecting a conveyance failure of the recording medium in the fixing device; A transport failure notifying unit that reports a transport failure, and a heating unit that heats a heating member. When the transport failure is detected by the transport failure detection unit, the transport failure is reported by the transport failure notification unit. An image forming apparatus comprising: a conveyance failure control unit for controlling the heating unit to heat the heating member at a predetermined temperature. 2. An image forming apparatus comprising a fixing device having a heating member for thermally fixing a developer on a recording medium, comprising: a conveyance failure detecting unit for detecting a conveyance failure of the recording medium in the fixing device; A heating unit for heating the heating member; and an opening / closing cover for removing a recording medium having a conveyance failure in the fixing device, wherein the conveyance failure is detected by the conveyance failure detection unit, and the opening / closing cover is opened. When operated, comprising a conveyance failure control means for controlling the heating means to heat the heating member at a predetermined temperature by the heating means,
Image forming device. 3. An image forming apparatus provided with a fixing device having a heating member for thermally fixing a developer on a recording medium, comprising: a conveyance failure detecting unit for detecting a conveyance failure of the recording medium in the fixing device; The fixing device includes a heating unit for heating the heating member, and an opening / closing cover for removing a recording medium having a conveyance failure in the fixing device. The opening / closing cover is closed, and the conveyance by the conveyance failure detection unit is performed. An image forming apparatus, comprising: a conveyance failure control unit for controlling the heating unit to heat the heating member at a predetermined temperature when the detection of a defect is maintained. 4. The control device according to claim 1, wherein the control unit controls the heating unit so that the heating unit heats the heating member at the predetermined temperature for a predetermined time. 4. The image forming apparatus according to claim 1. 5. A processable notifying means for notifying that removal processing of a recording medium having a conveyance failure is possible, wherein the conveyance failure control means is provided with the heating member heated by the heating means. Wherein when the temperature of the recording medium at which the conveyance failure has occurred is required to remove the recording medium, the processable notification unit notifies that the recording medium can be removed. Item 5. The image forming apparatus according to any one of Items 1 to 4. 6. A processing failure notification unit for notifying that a removal process of a recording medium having a transport failure cannot be performed, wherein the transport failure control unit includes a heating member heated by the heating unit. 4. The method according to claim 1, wherein when the temperature required for removing the recording medium having a conveyance failure has not reached a temperature required for removing the recording medium, the processing-impossible notifying unit notifies that the recording medium cannot be removed. 5. The image forming apparatus according to any one of 5. 7. An image forming apparatus according to claim 1, further comprising a heating unit operating state notifying unit for notifying an operating state and a non-operating state of said heating unit. . 8. A manual operation means for manually operating the heating means, wherein the conveyance failure control means, when receiving an input from the manual operation means, controls the heating member by the heating means. The image forming apparatus according to claim 1, wherein the image forming apparatus is controlled to heat at a predetermined temperature. 9. The conveyance failure control unit controls the heating unit to heat the heating member at a temperature lower than a heat fixing temperature and equal to or higher than a developer outflow start temperature. An image forming apparatus according to claim 1. 10. An image forming apparatus comprising: an opening / closing cover for removing a recording medium having a conveyance failure in the fixing device; wherein the conveyance failure control unit controls the operation of the heating unit when the opening / closing cover is opened. 10. The image forming apparatus according to claim 1, wherein the image forming apparatus is controlled to stop. 11. A cleaning device for cleaning the heating member, wherein the conveyance failure control unit removes the heating member by the cleaning unit when the detection of the conveyance failure by the conveyance failure detection unit is released. The image forming apparatus according to claim 1, wherein the image forming apparatus is controlled to perform cleaning.