Fixing film rotation error

fixing film rotation error

, Low fixing temperature detection after standby (by sub thermistor). E, , Fixing film rotation error. E, , Main motor rotation error. Find solutions to your canon fixing film rotation error question. Get free help, tips & support from top experts on canon fixing film rotation error related. I have change fixing film (just the film not a unit), but repeatly had error e The fixing unit rotation is havier then before. I know this.

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Clean the Fixing Film Sensor -- Error Code E007 -- iR3570 iR4570 iR3035 iR3045 iR3235 iR3245 Series

E Heater temperature fault
(fails to increase)
E Overheating detection error
E Heater temperature error (fails to reach
specific level; inadequate increase)
E Heater temperature error (abnormal
drop; low-temperature detection)
E Fixing film rotation error
E Main motor rotation error
E Fixing motor rotation error
E Waste toner case full, sensor error
E DA unit communication error
E Horizontal registration HP
detention error
E Power supply voltage error
(high-voltage error)
E Laser BD error
E Polygon motor rotation error
E No. 1 mirror base HP detecting error
E ADF image leading edge signal
detection fault (absent)
E Lamp ON error
E Standard white plate/edge white
plate read error
E Mcon-Dcon communication error
E Mcon-control panel
communication error
E Backup (EEPROM) error
E Zero-cross signal error
E Shading error
E Image data processing error
E Image transfer error
E Hard disk error
E Image memory fault
E Image memory battery fault
E HDD error
E Fax board error
E PDL board mounting error
E IPC initialization error (Rcon)
E IPC register error (ctrl)
E Communication error (with ADF)
E Communication error (with sorter
finisher)

E Communication error (with pedestal)
E Communication error (with ASSIST)
E Card reader, coin vendor
communication error
E Reader communication error
E Printer communication error
E SDRAM error
E Ethernet board error
E PCI bus error
E RIP1 board error
E Mcon-Rcon communication error
(Rcon detection)
E MPWS power supply voltage error
(low voltage error)
E Fan rotation error
E Pedestal main motor rotation error
[ADF]
E Back-up data read error
E Back-up data write error
E IPC error
[Saddle Finisher-G1]
E Communication error (Punch unit)
E Back-up RAM
E Feed motor
E Delivery motor

E Width plate shift motor

E Stapler motor
E Stapler slide motor
E Alignment motor
E Tray ascent/descent motor
E Paddle motor
E Puncher motor
E Puncher sensor error
E Puncher shift motor
E5F1 Saddle folder motor
[Finisher-J1]
E Communication error
E Stack handling motor
E Rear alignment motor
E Stapler motor
E Front alignment motor
E Delivery motor
E Delivery tray ascent/descent motor
E Stack handling error

sprers.eu > Technical Forums > Fax & Printer Fixing film rotation error Discussion > Canon > Canon Ir Error EE


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dipo_alam

, AM

Hi all,

I am new to photocopy business. I live in indonesia and have one ir in the last few week my canon copier had repeatly problem, the error code some times e, e, e

I have change fixing film (just the film not a unit), but repeatly had error e

The fixing unit rotation is havier then before. I know this because i had remove the Fuser unit (FG) from the machine and manually rotate the gear. I try to put paper inside the fuser unit and turn the gear, but the paper cannot get into the fuser unit, just stuck error a2006 undefined symbol adgroup the fuser. Can anyone help me what seem to be the problem.

I know that E had something with film rotation. Is there a part that i need to replace?

Thanks


SCREWTAPE

, fixing film rotation error, AM

Did you clear the error code first.

Are you you familiar with this procedure at all.

I know you said your new to this world.


dipo_alam

, AM

Yes I have clear the error from the service mode.

I have The problem is that the fuser cannot pull the paper. What should i Do, replace the whole Fusser Assy FG or other parts?


blazebusiness

, PM

Replacing the entire fuser will certainly fix the problem- that is if you don't want to invest more time in trying to figure out why paper will not feed into the fuser when you manually turn the gear. When you look at the fuser inlet and turn the gear - are the sleeve and lower roller both turning? Did you remove all the old grease and apply new grease when you replaced the sleeve? Sounds like when you reassembled the fuser something was put back together improperly.


SCREWTAPE

, AM

I would replace the fuser unit.


nallard84

, PM

I would try the fixing film assembly and possibly the pressure roller and check the cleaning roller as well. The cleaning roller might be gunked up with hardened toner which will destroy the pressure roller and cause rotational and heating errors.


rosaro75

, PM

remove and rotate the fuser unit by hand. check film is rotating or not. if not rotating grease inside the film may be dry. wipe it and reapply the grease(not normal grease) or dc12 fuser oil lightly. fixing film rotation error now try to rotate. if not rotate properly, then check pressure roller bush. it may be worn-out.
if film rotate properly then change the film or if original film you just paint with whitener on the white square mark on film in sensor side


dipo_alam

, AM

Hi Thanks all for the answer. Where i can get the greese? Is there any brand that recomended? Or any specification that i should know about the greese?


rosaro75

, AM

don't search for costly grease. use xerox dc12 fuser oil. it is light and and smoother. get it little from dc12 user. or clc fuser oil.


blazebusiness

, PM

Personally I would use only the origional grease. Grease and oil are very different. Trying to save money can end up costing more time and money. Play it safe, fixing film rotation error. Precision Roller has fixing film grease in a syringe that will do 50 sleeves for less than $ Part# S


Bill Agudelo

, PM

nallard84 is right on the money.

Chances are the cleaning roller is bad. Remove it and try the unit.

also, the pressure roller may be bad (rubber detached from the core)


rosaro75

, PM

Personally I would use only the origional grease. Grease and oil are very different. Trying to save money can fixing film rotation error up costing more time and money. Play it safe. Precision Roller has fixing film grease in a syringe that will do 50 sleeves for less than $ Part# S

i tried with $ cost grease also, fixing film rotation error. i got more copies when using fuser oil. especially in i got film rotation problem even i put original grease. then i tried with fuser oil. it was ok for compatible film too. costliest things only not solution, the easiest may be good solution.


dhanesh

, PM

hey error code in ir is fixing film not rotating properly its a chance to not rotate fixing film and fixing film counter (top side in fixing assembly) is fault or white mark in fixing film is may damaged or erased. U can use sony or panasonic white greese to use lubricate fixing fil use little lubrication only not much more greese it may be make jam in fixing film, befor make lubrication in film and heater coil u must clean use a cotton clothe, codes come with fault of fixing unit may be chance of line voltage problem too


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Error codes 

E

The reading of the main thermistor does not reach 30C 1 sec after the main power switch is turned on. Or, it does not reach 70C 2 sec thereafter

The fixing film unit is faulty, fixing film rotation error. The main thermistor has an open circuit. The fixing heater has an open circuit. The main power supply PCB is faulty. The DC controller PCB is faulty. To reset the error, execute the following in service mode: COPIER>FUNCTION>CLEAR>ERR

1. Connector Is the connector of the fixing assembly connected? a. main power supply PCB (J8) <-> relay connector <-> heater b. DC controller PCB (J) <-> relay connector <-> thermistor NO: Connect the connector.

2. Fixing film unit (thermistor) Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of the connectosr (4-pin) of the thermistor for electrical continuity. Is it W (open)? YES: The heater has an open circuit, or the thermal switch is open. Replace the fixing film unit.

3. Main power supply PCB, DC controller PCB Press the Start key. Is the drive voltage of the heater supplied by the connector J8 of the main power supply PCB? Main heater: between J (FSR1) and J (FSR COM) Sub heater: between J (FSR2) and J (FSR COM) YES: The heater drive power supply is faulty. Fixing film rotation error the main power supply PCB. NO: The thermistor control mechanism is faulty. Replace the DC controller PCB.

E

The main thermistor detects C or higher

The fixing film unit is faulty (i.e., the thermistor has a short circuit). The main power supply PCB is faulty. The DC controller PCB is faulty, fixing film rotation error. Caution To clear the error, execute the following in service move: COPIER>FUNCTION>CLEAR>ERR.

sprers.eu the interval between pin 1 and pin 2 and between pin 3 and pin 4 of the connectors (4-pin) of the thermistor for electrical continuity. Is it 0 W (short circuit)? YES: The thermistor has a short circuit. Replace the fixing film unit. If the thermistor has a short circuit, the indication in service mode (COPIER>DISPLAY>ANALOG) will be as follows from the start: FIXC= &#;C for the main thermistor; FIX-E=&#;C for the sub thermistor. 

2. Main power supply PCB, DC controller PCB Try replacing the main power supply PCB. Is the problem corrected? YES: End. NO: Replace the DC controller PCB.

E

The main thermistor or the sub thermistor detects overheating (hardware circuit detection)

The fixing film unit is faulty (i.e., fixing film rotation error, the thermistor has a short circuit). The main power supply PCB is faulty. The DC controller PCB is faulty. Caution To clear the error, execute the following in service move: COPIER>FUNCTION>CLEAR>ERR

sprers.eu the interval between pin 1 and pin 2 and between pin 3 and pin 4 of the connectors (4-pin) of the thermistor for electrical continuity, fixing film rotation error. Is it 0 W (short circuit)? YES: The thermistor has a short circuit. Replace the fixing film unit. If the thermistor has a short circuit, the indication in service mode (COPIER>DISPLAY>ANALOG) will be as follows from the start: FIXC= &#;C for the main thermistor; FIX-E=&#;C for the sub thermistor. 

2. Main power supply PCB, DC controller PCB Try replacing the main power supply PCB. Is the problem corrected? YES: End. NO: Replace the DC controller PCB.

E

The sub thermistor detects about C or higher

The fixing film unit is faulty (i.e., the thermistor has a short circuit). The main power supply PCB is faulty. The DC controller PCB is faulty. Caution To clear the error, execute the following in service move: COPIER>FUNCTION>CLEAR>ERR.

sprers.eu the interval between pin 1 and pin 2 and between pin 3 and pin 4 of the connectors (4-pin) of the thermistor for electrical continuity. Is it 0 W (short circuit)? YES: The thermistor has a short circuit. Replace the fixing film unit. If the thermistor has a short circuit, the indication in service mode (COPIER>DISPLAY>ANALOG) will be as follows from the start: FIXC= &#;C for the main thermistor; FIX-E=&#;C for the sub thermistor. 

2. Main power supply PCB, DC controller PCB Try replacing the main power supply PCB. Is the problem corrected? YES: End. NO: Replace the DC controller PCB.

E

The temperature of the fixing film is as follows:  has exceeded C, but does not reach C within 1 sec thereafter. has exceeded C, but does not reach C within 1 sec thereafter. has exceeded C, but does not reach C within fixing film rotation error sec thereafter

The fixing film unit is faulty (i.e., the main thermistor TH1 has poor contact, or the fixing heater is faulty). The main power supply PCB is faulty. The DC controller PCB is faulty. Caution To clear the error, execute the following in service mode: COPIER>FUNCTION>FCLEAR>ERR.

1. State Turn on the power switch, and clear E/E Thereafter, turn off and then on the power switch. Does the fixing heater operate? NO: See &#;The fixing heater fails to operate.&#;

2. Wiring Is the wiring from the DC controller PCB to the fixing film unit normal? NO: Correct the wiring.

3. Fixing film unit, DC controller PCB Try replacing the fixing film unit. Is the problem corrected? YES: End. NO: Replace the DC controller PCB.

E

The main thermistor reading is lower than C when paper is moved

The fixing film unit is faulty (i.e., the main thermistor (TH1) has poor contact or has an open circuit; or, the fixing heater is faulty). The main power supply PCB is faulty. The DC controller PCB is faulty. Caution To clear the error, execute the following in service mode: COPIER>FUNCTION>CLEAR>ERR

1. State Turn on the power switch, and clear E/E Thereafter, turn off and then on the power switch. Does the fixing heater operate? NO: See &#;The fixing heater fails to operate.&#;

2. Wiring Is the wiring from the DC controller PCB to the fixing film rotation error film unit normal? NO: Correct the wiring.

3. Fixing film unit, DC controller PCB Try replacing the fixing film unit. Is the problem fixing film rotation error YES: End. NO: Replace the DC controller PCB.

E

An error in the rotation of the fixing film is detected. The reading of the main thermistor is C or higher and, in addition, the fixing film sensor does not detect the rotation of the film for 6 sec or more while the fixing motor is driven

The fixing film sensor (PS45) is faulty. The DC controller PCB is faulty. Caution To clear the error, execute the following in service mode: COPIER>FUNCTION>CLEAR>ERR

1. Wiring Are the wring and the connectors connected securely? DC controller PCB (J) <-> relay connector <-> fixing film sensor NO: Connect the wiring and the connectors.

2. Fixing film sensor Check the fixing film rotation sprers.eu the fixing motor is rotating, is the film rotation detection signal sent by the fixing film sensor to the concoctor J of the DC controller PCB? Film rotation detection signal: 5V pulse signal between JA9 (FILM_ROT_D) and JA8 (GND); at intervals of msec ON and msec OFF NO: If the fixing film is normal, replace the sensor.

3. Fixing film unit, DC controller PCB Is there a fault in the fixing film edge rotation detection mechanism? YES: Replace the fixing film unit. NO: Replace the DC controller PCB.

E

After the main motor drive signal is generated, the clock signal does to arrive within sec

The main motor (M2) is faulty. the DC controller PCB is faulty.

1. Connector Is the connector of the main motor connected? NO: Connect the connector.

2. Main power supply PCB Is the drive voltage (24 V) of the main motor supplied by the main power supply PCB? Main power supply PCB: between J (24VU1-SW) and J (OVU1) NO: Replace the main power supply PCB.

3. Main controller (M2), DC controller PCB Press the Start key. Is the lock signal of the main motor present at the connector J on the DC controller PCB? Lock signal: JA10 (MM_LOCK) YES: Replace the main motor. NO: Check the wiring; if normal, replace the DC controller PCB.

E

After the fixing motor drive signal is generated, the clock signal does not arrive within sec.

The fixing motor (M19) is faulty. The DC controller PCB is faulty.

1. Connector Is the connector of the samsung hdd smart error motor connected? NO: Connect the connector.

2. Main power supply PCB Is the drive voltage (24 V) of the fixing motor supplied by the main power supply PCB? Main power supply PCB: between J (24VU1-S) and J (OVU1) NO: Replace the main power supply PCB.

3. Fixing motor (M19), DC controller PCB Press the Start key. Is the lock signal of the fixing motor present at the connector (J) on the DC controller PCB? Lock signal: JB4 (FSRM_LOCK*) the DC controller PCB change from 0 to about 5 V? YES: Replace the fixing motor. NO: Replace the DC controller PCB.

Canon iR E

I am trying to fix system error E of Canon iR – Fixing film rotation error / Fixing film has become displaced



system errors Canon iR / iRJ / fixing film rotation error / iR / iRi


error code

sub code

description

E Fixing temperature abnormal rise
E Fixing unit temperature rise detection (by main thermistor)
Fixing unit temperature rise detection (by sub thermistor)
E Fixing unit temperature insufficient rise
E Low fixing temperature detection after standby (by main thermistor)
Low fixing temperature detection after standby (by sub thermistor)
E Fixing film rotation error / Fixing film has become displaced
E Main motor rotation error
E Waste toner full detection
Waster toner full detection sensor failure
E Duplex unit connection error
E BD cycle out of range
E Erroneous communication with printer engine
E Fixing film rotation error communication error
E Offset error
E Stapling error
E Paper surface not detected (standard tray)
Not moved within the specified time (standard tray)
Sensor not reached within 3 seconds (standard tray)
Encoder clock failure (standard tray)
E Paper surface not detected (optional tray)
Not moved within the specified time (optional tray)
Sensor not reached within 3 seconds (optional tray)
Encoder clock failure (optional tray)
E Stack delivery error
E Shutter failure
E Erroneous communication with optional cassette
E Erroneous communication with card reader (serial communication)
Erroneous communication with coin vender (serial communication)
E Erroneous communication between controller and printer
E CCU communication error
E Erroneous communication between controller and network board
E Language file/boot ROM/USB memory error



E Fan failure
E Fixing drive circuit failure

April 6th, in general

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USA - Film type fixing device - Google Patents

This application is a continuation, of application Ser. No. 08/, filed Oct. 13,now abandoned.

The present invention relates to a fixing device using an endless film, more particularly to shift of film.

As disclosed in U.S. Pat. No. 5,, a film type fixing device has been proposed which is constituted by a heater, a driving roller, a tension roller, and an endless film.

With such a device, the film tends to laterally shift, fixing film rotation error, and therefore, the position of the film is detected by a sensor, and a tension roller is moved in response to the output of the sensor to control the shift of the film.

When the position of the film is extremely shifted, the abnormality of the film is stored as error information, and the fixing operation is prohibited. If this fixing film rotation error, damage in the film is deemed as having been occurred, and therefore, a serviceman is called to repair the apparatus. Only then, the error information is reset to permit resumption of the fixing operation.

In the case of the device as disclosed in U.S. Pat. No. 5, wherein the position of the film is filmed on the basis of the rotation of the film, an erroneous detection may occur despite that the film has not yet been shifted to the limit, if the film does not rotate for some reason or another such as slip or the like. The error information is stored, and the fixing operation is prohibited, and therefore, the serviceman has to be called in order to reset the error information to permit the fixing operation, despite no damage to the film.

Accordingly, it is a principal object of the present invention to provide a film type fixing device wherein the error state is correctly detected to prevent unnecessary serviceman-calling.

It is another object of the present invention to provide a film type fixing device having controlling means for controlling a back-up operation for error information on the basis of an output of film position detecting means when the error detecting means detects the error on the basis of the position of the film.

These and other objects, features and advantages of the present invention will become more apparent upon a consideration of the following invention taken in conjunction with the accompanying drawings.

FIG. 1 is a sectional view of an image forming apparatus using a fixing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the fixing device.

FIG. 3 is a perspective view of the fixing device.

FIG. 4 is an illustration of a heater.

FIG. 5 Is a top plan view of an image forming apparatuses.

FIG. 6 is an image forming apparatus of the image forming apparatus.

FIG. 7 is a development of an endless film.

FIG. 8 shows an output waveform from a film sensor.

FIG. 9 shows division of region of the output waveform from the film sensor.

FIG. 10 is d main routine flow chart for image formation.

FIG. 11 is a flow chart for the film shift control.

FIG. 12 is a flow chart for error clearance

Referring to the accompanying drawings, the embodiments of the present invention will be described.

FIG. 1 is a sectional view of an image forming apparatus having a film type fixing device according to an embodiment of the present invention.

In FIG. 1, designated by 1 is a copying apparatus; 2 is a pressure plate; 3 is an original carriage for supporting an original; 4 is a light source; 5, 6, 7 are reflection mirrors; 8 is a lens; 9, 10, 11 are reflection mirrors; and 12 is a photosensitive drum.

Around the photosensitive member 12, there are provided a primary charger 13, a developing unit 15, a transfer unit 14, and a cleaning unit 38 and so on.

A fixing unit 21 functions to heat and fix an unfixed image while feeding a recording material coming form the photosensitive member side by the nip thereof.

In FIG. 1, fixing film rotation error, the driving system is separated into a main driving system for driving a sheet feeding portion, a transportation portion, a photosensitive member, and a fixing portion and an optical driving system for driving the optical system which is a load. The main driving source uses a DC brush-less motor 25, fixing film rotation error, and the optical driving source (including a mechanism for reading an image) uses a stepping motor A controller (CONT) outputs a phase excitation signal applied in each phase A, A*, B. B* of the stepping motor In this embodiment, the excitation driving type of the stepping motor 26 is switched between a two-phase excitation type and a phase excitation type in accordance with speed information set for the load.

Sheet feeding type includes sheet feeding from a cassette 23 and a manual multi-feeding (24). In the case of the sheet feeding from the cassette 23, fixing film rotation error, control is effected using a switch for detecting presence or absence of the cassette 23, switches 31 for detecting the size of the sheets in the cassette 23 and a switch 37 for detecting presence or absence of the sheet in the cassette When abnormality is detected by the switches, the error is displayed on a display portion which will be described hereinafter.

In the case of multi- manual insertion, the control is effected using a switch 93 for detecting the state of the manual feeding station 24, and when an error is detected, it is displayed on a display portion which will be described hereinafter.

The photosensitive member 12 rotates in fixing film rotation error clockwise direction on the drawing. The photosensitive member 12 is charged by the primary charger 13, and is exposed to the image light at the exposure station, fixing film rotation error, and the resultant image is developed by a developing unit The developed image is transferred onto a transfer sheet fed from the sheet feeding portion by the transfer unit portion After transfer of the image, the photosensitive member 12 is cleaned by the cleaning unit 38 for removing the remaining toner, and the residual potential is removed by a pre-exposure lamp 16 to be prepared for the next image formation. The transfer sheet now having the transferred image is fed to the fixing unit 21 on a conveyer belt of the conveyer unit

The fixing unit 21 comprises a driving roller 35, a tension roller 45, and a pressing roller 44 (3 rollers), a heater 43, film 47 and so on. FIG. 2 and 3 show a construction of the fixing unit

In these figures, an endless film 47 is extended around the driving roller 35, tension roller 45 and a heater 43, and the film 47 is driven by a driving roller 35 while keeping sliding contact with the heater

The pressing roller 44 is urged to the heater 43 with the film 47 therebetween to form a nip N. The nip functions to feed the recording material P carrying an unfixed toner image T, while the unfixed toner image T is being fixed on the recording material by the heat from the heater 43 through the film

Designated by 41 is a temperature detection element in the form of a thermistor or the like, and is contacted to the back side of the heater 43 directly. Another temperature detection element 48 is mounted on the back side of the heater 43 similarly to the temperature detection element The temperature detection element 48 is mounted to the heater 43 adjacent an end portion thereof. This is because if a small size sheet is fed, the temperature rises in the portion where the sheet does not exist, and the interval of the sheet feeding is expanded fixing film rotation error the basis of the detection of this temperature.

Referring to FIG. 3, a sensor 46 detects the position of the film in a direction perpendicular to the rotational direction. In accordance with the output of the sensor, the motor 50 is driven, in response to which the tension roller 45 is inclined to control the shift of the film.

FIG. 4 shows a structure of the heater which comprises a ceramic substrate 60, a resistor 61 printed thereon and an electrode 62 adjacent an end portion thereof.

The resistor 61 is supplied with electric energy by the electrodes 62 at the opposite ends so that the resistor 61 generates heat.

Designated by 63 is a protection layer of glass or the like on the resistor

The heater 43, fixing film rotation error, as shown in FIG. 2, is supported on a heat resistivity plastic resin material supporter

FIG. 5 is a schematic top plan view of the device of FIG. 1 as seen from the top wherein 70 is a display portion for displaying messages such as error messages; 71 is a copy key, for starting copy operation; and 72 is a main switch for ON-OFF control of the voltage supply to the device

Referring to FIG. 6, the description will be made as to operation of the device.

Designated by is a controller, for temperature control for the fixing device, for the electric power control and for the shift control etc. for the film, and is a circuit for detecting the voltage of the voltage source and input voltage. Designated by is a switching circuit for switching the voltage applied error creating cursor handle stored procedure the heater 43, and is memory for storing various data.

The controller supplies the AC input corrected voltage from the input voltage detection circuit to the A/D of the controller This fixing film rotation error an execution value Erms of the input voltage. The output of thermistors 41, 48 are supplied to the A/D of the controller The resistance value of the heater 43 has beforehand measured under the normal temperature ambience condition, and is displayed on the fixing unit 21 The resistance value is supplied php set fatal error handler the memory by an operating portion (unshown).

On the basis of the AC input, zero-cross signal is produced, and is supplied to the controller as an interruption signal.

A trigger signal functions as a timing signal for phase control of the heater. Designated by 46 is a sensor (photo-interrupter) as a film position detecting means for detecting the position of the film in the direction perpendicular to the movement direction of the film, and the film motor 50 drives or shifts up and down the tension roller 45 on the basis of the output of the sensor

The description will be made as to the control of the heater. The heater is provided by printing resistor material on the ceramic substrate, as has been described, and therefore, is excellent in the heat responsivity. Therefore, in a normal ON/OFF control, fixing film rotation error ripple relative to the target temperature if fixing film rotation error use is made with the normal ON/OFF control, or the heater may be overpowered with the possible result of the damage to the heater, fixing film rotation error. Therefore, an electric power control is used to supply a constant electric power. In order to reduce the ripple, the electric power is changed over in response to the temperature detected by thermistor,

The description will be made as to the electric power control for the heater. The phase control is used also for the electric power control for the heater similarly to the control for the exposure lamp. The heater is a pure resistance load, and therefore, the electric power W is:

W=VH2 /R

VH : voltage applied to the heater

R: resistance value of the heater.

Since the resistance value R of the storing varies significantly, the resistance value R is stored in a non-volatile memory for individual image forming apparatus. The electric power to be supplied to the heater is known, and therefore, the voltage VH across the heater is determined from the above equation, as follows: ##EQU1##

From formula (1), VH2 is calculated, and Erms2 is obtained from the value detected by the AC input voltage detection circuit. Then, the time period TH from the zero-cross signal to the trigger signal for the heater can be determined, from formula (2).

In this embodiment, TH is determined from Erms2 /VH2 using a table.

Through the algorithm described hereinbefore, the electric power control for the heater is carried out. The electric power control for the heater is kept always during copy operation to maintain a constant temperature of the heater.

The description will be made as to the shift control for the film.

FIG, fixing film rotation error. 7 is a development of the endless film As shown in the Figure, one of the lateral end of the endless film 47 is cut inclinedly (bias cutting) to provide inclined portion. This is done to detect the lateral shift of the film. A sensor (photo-interrupter) is provided on the apparatus at the side. where the film has the bias cutting portion. When the receiving portion detects the light from the emitting portion, a low-level signal is produced, and, when the light from the emitting portion is blocked by the film, the high-level signal is produced, by the use of the photo-interrupter 46

The relation between the shift of the endless film 47 and the output of the photo-interrupter 46, will be described. Since the lateral side of the film 47 is cut inclinedly, fixing film rotation error, the output of the photo-interrupter 46 is as shown in FIG. 8 when the film 47 rotates in the direction indicated by the arrow through one full turn, fixing film rotation error. When the position of the film does not change, the output from the photo-interrupter 46 has a constant duty ratio (ratio of the time periods producing the high level and the low level), fixing film rotation error. A period τ corresponds to the time period for the film one full turn. With the deviation of the film position, the duty ratio changes in accordance-with the fixing film rotation error, as shown in FIG. 8, (b).

More particularly, when the film 47 approaches to the photo-interrupter 46, the time of the high-level output is long, and when the film 47 is remote from the photo-interrupter 46, fixing film rotation error, the time of high-level output is short.

The one period τ is divided equally into a plurality of parts (9 parts in this embodiment), and the adjacent parts are slightly overlapped (FIG. 9). The duty ratio of the film sensor output is detected, and it is determined on which region or area the detected value falls. In FIG. 9, the duty ratio falls in an area 4. The duty ratio of previous detection is stored in the memory When the detected value falls in the overlapping area, the area selected in the previous detection is selected. In other words, hysteresis characteristics are provided. By this, too sensitive response of the control is avoided.

As to the shift control method for the film, the film motor 50 is driven so that the movement direction of the endless film 47 reverses for each change of the area. Referring to FIG. 3, the description will be made as to the position of the tension roller 45 and the movement direction of the endless film If the side of the tension roller 45 driven by the film motor 50 takes an upper position a, (film motor 50 direction is rotational direction CCW), the endless film 47 moves toward the film motor 50 side A(rear side). Conversely, if the tension roller 45 takes the lower position b (rotational direction CW), the endless film 47 moves toward the B side (front side). Table 1 shows the relation between the duty ratio (region) change by the film sensor 46 and the rotational frequency of the film motor

TABLE 1 ______________________________________ AREA CHANGES Terrorist takedown secret operation. FILM MTR ROTATIONS DIRECTION ______________________________________ 2 to 1 6 CW 3 to 2 3 CW 4 to 3 3 CW 5 to 4 3 CW 5 to 6 3 CCW 6 to 7 3 CCW 7 to 8 3 CCW 8 to 9 6 CCW ______________________________________

Thus, in this embodiment, the shift state of the film is not known unless the endless film 47 is rotated. When the shift control is carried out, fixing film rotation error, the film is necessarily rotating, and if the main motor stops during rotation of the film motor 50, the film stops. In this case, the rotation of the film motor fixing film rotation error interrupted, and the rest of the rotation of the film motor is carried out upon the next time film rotation This is in order to avoid production of crease, since otherwise (if only the tension roller is driven when the film is at rest), the film is creased.

Referring to the flow chart of FIGS. 10, 11, and 12, the sequence of operation, mainly of the operation related to the shift of the film. When the copy key is depressed in FIG. 10 (), the main motor 29 for driving the photosensitive member and the fixing device is rotated (). Sequentially, the copy sequence is carried out () to execute a film shift control routine (). The confirmation is made as to whether the copy sequence is completed or not, and if not, the operation goes back to the copy process routine ()-(). If the copy sequence is completed, the main motor 25 is stopped (). Referring to FIG. 11, film shift control will be described. In the film shift control routine (), it is checked whether the main motor is rotating or not (). This is carried out to permit film shift fixing film rotation error only during the main motor rotation. When the rotation of the main motor is confirmed, it is confirmed whether or not there is the rest of the rotational frequency of the film motor, namely, whether or not the film motor was rotating upon the stop of the previous main motor rotation (), fixing film rotation error. If so, it is fixing film rotation error through the rest rotational frequency. Then, the output of the film sensor is read in (), and the duty ratio (region) is determined, fixing film rotation error, and-the region is stored (). The discrimination is made as to whether or not the film is completely shifted. If so, the error clearance () is carried out, and this is the end of this routine. If the film is not completely shifted, the comparison is made between the area stored, and the current area, fixing film rotation error. Then, it is determined whether a change occurs or not (). If so, the rotation and rotational direction of the film motor is determined (), and the film motor is rotated accordingly (). The discrimination is made again as to whether the main motor is rotated or not, and if so, the film motor is rotated through a predetermined number of turns. If the main motor was stopped, the film motor is immediately stopped, and the rest of the rotations of the film motor is stored (). This is the end of this subroutine.

In this embodiment, when all of the outputs of the sensor 46 are High level or Low level, it is discriminated that the output from the sensor 46 is out of the predetermined range (area ), and therefore, an error signal is produced. The error detection is effected by a controller including an error detecting means.

Referring to FIG. 12, error clearance () upon production of the error information will be described.

In this embodiment, when the error isdetected by the error detecting means, the storing of the error information is selected by controller on the basis of the output of the film position detecting means (sensor).

Referring to FIG. 12 the error clearance () will be described. The area previously stored and the current area are compared in order to discriminate whether the error is reached as a result of gradual change at a rate not more than a predetermined rate or the error is resulted from change at a rate more than a predetermined rate and skipping an area ().

For example, if the error occurred as a result of change skipping one or more areas, as indicated by (5) in FIG. 8, (c), it is discriminated as an error resulting from complete shift of the film, and therefore, it is not stored in the memory, but the error display is carried out on the display portion to notify the occurrence system configuration data read error acer the error (), and the error clearance routine is finished. When the error occurs as a result of gradual change, it is discriminated that the control of the film shift becomes unable, and the error is fixing film rotation error in the memory, and the error display is carried out and prohibit the image forming operation including the fixing operation to prevent the copy operation.

The error information stored in the memory is not reset even by the OFF/ON of the voltage source switch. In order to clear the error, a serviceman has to be called (serviceman-calling), and the error is cleared by maintenance operation of the serviceman.

The error information not stored, is cleared by OFF/ON of the voltage source switch, and the copy start is possible thereafter. Accordingly, in this Embodiment, fixing film rotation error, when the error information is not stored, a display prompting rest of the voltage source is given as well as the error display on the display portion.

The stored or backed-up state means that the information (error information) is not cleared even by the OFF/ON of the voltage source, and the non-stored or non-backed-up information (even if it is once memorized) means that it is not cleared even by the OFF/ON of the voltage source.

As described in the foregoing, the storing of the error information is controlled on the basis of the output of the film position detecting means, and therefore, if the film stick or the like, the production of the error information despite the correct position of the film can be avoided, so that unnecessary serviceman calling can be avoided In this embodiment, 1 period is divided into 9 areas, but it may be divided into a larger number of parts, and the limit number of skipped areas may by two or more.

In this embodiment, the OFF/ON of the voltage supply is carried out by the voltage source switch (main switch), but the rest switch may be provided in addition to the voltage source switch, and may be used for clearing the error not stored or back-ed up.

While the invention has been described with reference to the structures disclosed herein, it is not confined to the details set forth and this application is intended to cover such modifications or changes as may come within the purpose of the improvements or the scope of the following claims.

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