JPH09146408A - Image heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally fix an image at all times even at a printing process for a plurality of jobs by selecting temperature set so as to correspond to the second recording material when the second recording material is heated at a continuous heating process for the first recording material. SOLUTION: A latent image formed on a photosensitive member 202 is developed with a developing machine 203. Also, transfer paper sheets are carried on a transfer paper sheet stacking part 204 or 205, and a developed image is transferred thereto in a transfer part 206. Furthermore, at the time of starting a copying process, an applicable temperature table is determined, on the basis of temperature detected with a thermister in a fixing part 207, and fixing target temperature is determined by use of the table. When paper sheets to be fed are thick, the established fixing target temperature is changed by the amount of thick paper sheet offset, and re-established. Also, when a continuous copying process is for thick paper sheets, and ordinary paper sheets are fed for the succeeding copying process, the target temperature is changed by the amount of ordinary paper sheet offset and re-established.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image heating device for heating an image on a recording material.

[0002]

2. Description of the Related Art Generally, image formation in an electrophotographic image forming apparatus is performed as follows.

First, the surface of the electrophotographic photosensitive member is uniformly charged by the charging section. Next, the exposure section irradiates light corresponding to the original image to remove the charged electric charge of the electrophotographic photosensitive member portion irradiated with the light. As a result, an electrostatic latent image corresponding to the original image is formed. Then, the electrostatic latent image is developed in the developing section to form a visible image (toner image). This toner image is transferred to a recording material such as paper at the transfer section,
Further, the unfixed toner image on the recording paper is fixed by the fixing nip portion (image fixing portion) between the fixing film and the conveying roller. In addition, the transfer residual toner that has not been transferred in the transfer portion is removed from the surface of the electrophotographic photosensitive member by the cleaning member.

By the way, in the above image forming apparatus,
For recording materials with different paper types, such as thick paper, at the start of copying, the target fixing temperature is set according to the paper type, and the target fixing temperature is set according to the number of copies to achieve optimum image fixing. Came.

[0005]

However, in the configuration so far, in a multifunction machine equipped with the functions of COPY, FAX, RPINTER, etc., for example, the envelope copy of the interrupt copy is performed during the plain paper printout of the FAX. In that case, there is a problem in that the image is fixed at the target fixing temperature of the plain paper when the envelope copy is printed, and the optimum image cannot be fixed.

According to the present invention, when the unfixed toner image is heat-treated in the image fixing unit, the fixing temperature is updated for each sheet according to various kinds of papers, so that the printing is always performed even during the printing of a plurality of jobs. An object of the present invention is to provide an image forming apparatus capable of performing optimum image fixing.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a heating member for heating an image on a recording material, a temperature detecting element for detecting the temperature of the heating member, and a detection for the temperature detecting element. In an image heating apparatus having an energization control means for controlling energization so that the temperature maintains a set temperature, when the second recording material is heated while the first recording material is continuously heated, It is characterized in that the set temperature can be switched according to the set temperature.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment) FIG. 1 is a block diagram illustrating the configuration of an image forming apparatus using the image heating apparatus of the present invention.

In FIG. 1, reference numeral 1 is an image input device (reader section) for converting a document into image data, which functions as a first image input means, and 2 is a plurality of types of recording paper for functioning as image output means. An image output device (printer unit) 3 which has a cassette and outputs image data as a visible image on a recording sheet in response to a print command is an external device electrically connected to the reader unit 1 and will be described below. It has various functions.

That is, the external device 3 functioning as the second image input means accommodates the telephone line 13 and has the facsimile section 4, the file section 5, and the hard disk 12 connected thereto.
An external storage device 6 connected to the file unit 5, a computer interface unit 7 for connecting to the computer 14 (PC / WS) and the LAN 15, a formatter unit 8 for converting information from the computer 14 into a visible image, An image memory unit 9 for accumulating the information from the reader unit 1 and temporarily accumulating the information sent from the computer 14, a core unit 10 for controlling each of the above functional processes, and the like are provided. Further, CONT1 is a reader control unit and CONT2 is a printer control unit, which are configured to be communicable with the core unit of the external device 3, and include a CPU, a ROM, and an R.
AM etc. are provided.

FIG. 2 is a diagram showing a cross-sectional structure of the reader unit 1 and the printer unit 2 shown in FIG. Hereinafter, the configuration and operation will be described.

In FIG. 2, the originals stacked on the original feeding device 101 are sequentially conveyed one by one onto the original glass platen surface 102. When the original is conveyed to a predetermined position on the glass surface 102, the lamp 103 of the scanner unit is turned on and the scanner unit 104 moves to illuminate the original.
The reflected light of the document is input to a CCD image sensor 109 (hereinafter referred to as CCD) via mirrors 105, 106 and 107 and a lens 108.

Further, the image processing section 110 performs image processing set by various operation sections. Further, it has an image memory and has a function of rotating the output direction of the image.

The external switching circuit of the image processing unit 110 includes a selector 1100 for switching the signal from the reader unit 1 to the printer unit 2 or the external device 3, and the signal from the reader unit 1 and the external device 3 are provided. It also has a function of selecting any one of the signals and connecting it to the printer unit 2.

Further, in the external switching circuit of the image processing section 110, the electric signal contacted with the printer section 2 is converted into an optical signal modulated by the exposure control section 201, and the photoconductor 20 is converted.
Irradiate 2. The latent image formed on the photoconductor 202 by the irradiation light is developed by the developing device 203. The transfer paper is conveyed from the transfer paper stacking unit 204 or the transfer paper stacking unit 205 at the same timing as the leading edge of the latent image, and the transfer unit 2
At 06, the developed image is transferred. The transferred image is fixed on the transfer paper by the fixing unit 207, and then discharged from the paper output unit 208 to the outside of the apparatus. The transfer paper output from the paper output unit 208 is output to each bin when the sort function of the sorter 220 is operating. Meanwhile, Sorter 2
When the sorter function of 20 is not operating, the sorter 22
It is discharged to the 0th highest bin.

In the fixing unit 207, the temperature is detected by a thermistor (not shown) installed in the fixing unit 207, and the temperature is adjusted by controlling the amount of power supply. The control of the power supply amount will be described with reference to FIGS. 15, 16, 17, 18, and 19.

First, the target temperature table to be used is determined by the temperature detected by a thermistor (not shown) installed in the fixing unit 207 at the start of copying.

When the detected temperature at the start of copying is less than 100 degrees, the target temperature table 1 of FIG. 15 is used. When the detected temperature at the start of copying is 100 degrees or more and less than 140 degrees, the target temperature table 2 in FIG. 16 is used. If the detected temperature at the start of copying is 140 degrees or higher, the target temperature table 3 in FIG. 17 is used. In each target temperature table, the target temperature is set according to the number of copies in continuous copying. For example, in the target temperature table 1 of FIG. 15, the target temperature is 225 degrees from the first sheet to the fourth sheet, and the target temperature is 220 degrees from the fifth sheet to the sixth sheet. Further, at the time of thick paper copy, the target temperature is set by offsetting from the target temperature. For example, when using the target temperature table 1, the target temperature of the thick paper copy at the time of copying the fifth sheet is 240 at an offset of +20 degrees.
The degree is 220 + 20.

Further, when the continuous copy is thick paper and the current copy is plain paper, there is a temperature rise due to the target temperature offset of the fixing unit. Plain paper Offset and reset. For example, the offset temperature of the plain paper at the time of copying the fifth sheet using the target temperature table 1 is -5 degrees 215.
Degrees.

The above description will be described with reference to FIGS. 4 and 20. The first sheet (40
2) The target temperatures of the second sheet (403), the third sheet (404), and the fourth sheet (405) have offset values of 225 degrees, 225 degrees, 245 degrees, and 220 degrees, respectively. The target temperature setting timing is 2 when the first sheet (402) is printed at the start of printing (2002 is LOW → HI).
The first and subsequent sheets are set when the previous paper passes through the paper ejection sensor 401 of the fixing unit 207 (when the paper ejection sensor 2004 changes from HI to LOW). In FIG. 20, reference numeral 2001 denotes a temperature curve detected by a thermistor installed in the fixing unit 207. When the current detected temperature and the target temperature are different, the fixing power is controlled by performing energization power control described later. Part 20
Change the temperature of 7.

The target temperatures of the second and subsequent sheets are set to the register ON.
It is also possible to start the timer at the timing of (2003) and set it after a fixed time t. And
At the end of printing (2002: HI → LOW), the target temperature is set to zero.

In FIG. 18, the target temperature and the fixing unit 2 described above are used.
The amount of electric power supplied is set based on the temperature detected by a thermistor (not shown) installed at 07. When the temperature detected by the thermistor (not shown) installed in the fixing unit 207 is less than -12 degrees below the target temperature with respect to the target temperature, the applied power amount is set to the maximum applied power (1801). When the temperature is less than -6 degrees below the target temperature and is -12 degrees or more, the amount of energized power is set to 1/8 of the maximum applied power (1802). When the temperature is less than -3 degrees below the target temperature and -6 degrees or more,
The amount of energized power is set to 1/6 of the maximum applied power (180
3). When the temperature is less than +3 degrees and -3 degrees or more above the target temperature, the amount of energized power is set to 1/3 of the maximum applied power (1804). When the temperature is +3 degrees or higher than the target temperature, the energized electric energy is set to 0 (1805).

In FIG. 19, the voltage (190
In contrast to 1), the fixing heater relay (not shown) is turned on at the timing of t (1902), and the fixing heater relay is turned off at a half cycle of the AC input voltage, so that the energization time is t ( 1902) to π (π is a half cycle of the AC input voltage 1901). The amount of power supply at that time is indicated by the hatched portion 1903. In addition, the energizing power is 0
In case of, keep the fixing heater relay OFF.

As shown in the calculation formula in FIG. 19, the ratio of the square of the output voltage to the square of the input voltage is made into a table (not shown) so that the target temperature and the fixing unit 207 are set. By performing the energization power control with the energization power amount set from the temperature detected by the thermistor (not shown), the fixing unit 2
07 temperature control is performed.

Next, a description will be given of a direction in which images to be sequentially read are output on both sides of one output sheet.

After the output sheet fixed by the fixing section 207 is once conveyed to the sheet discharge section 208, the delivery direction of the sheet is reversed, and the re-transferred transfer sheet stacking section 210 is passed through the conveyance direction switching member 209. Transport to. When the next manuscript is prepared,
The original image is read in the same manner as in the above process, but the transfer paper is fed from the re-feeding receiving paper stacking section 210, so that two original images are output on the front and back surfaces of the same output paper. can do.

Further, regarding the paper feeding from the manual feed tray 230, the paper feeding is performed by the setting from the operation section described later. After the paper is fed, the process is the same as above.

As shown in FIG. 1, the external device 3 is connected to the reader unit 1 by a cable, and the core unit 10 in the external device 3 controls signals and functions. In the external device 3, a facsimile unit 4 for performing facsimile transmission / reception, a file unit 5 for converting various document information into electric signals and storing the signals on a magneto-optical disk, and a formatter unit 8 for expanding code information from the computer 14 into image information. , An image memory unit 9 for accumulating information from a computer interface unit 7 for interfacing with a LAN and a computer, a reader unit 1 or temporarily accumulating information sent from a computer, and the above-mentioned functions. It comprises a core unit 10 for controlling.

FIG. 3 is a plan view showing an example of an operation panel arranged in the reader section 1 shown in FIG.

In the figure, reference numeral 3001 denotes a display unit, which displays operating states and messages. In addition, a display portion 3001
The surface of is a touch panel, and touching the surface functions as a selection key. A numeric keypad 3002 is a key for inputting numbers. 3003 is a start key, and the operation is started by pressing this key.

A thick paper feed tray setting key 3004 is pressed to enter the thick paper feed tray setting mode shown in FIG.

In FIG. 5, the paper type setting for various paper feed trays is, for example, 5 for the tray 2 (heat transfer paper stacking unit 205).
Press the 03 key to switch between plain paper and thick paper settings. Setting key 501 on the bypass tray (230 in FIG. 2),
The setting key 502 of the tray 1 (heat transfer paper stacking section 204) is also
Similar to the tray 2 setting key 503, the key is pressed to switch the setting between plain paper and thick paper. In addition, the presence / absence of paper in each tray is displayed by a paper-free detection sensor (not shown) installed for each tray. The presence / absence of paper in the bypass tray is indicated by 504. Similarly, the presence / absence of paper in tray 1 is indicated by 505, and the presence / absence of paper in tray 2 is indicated by
Display at 506.

FIG. 6 shows a circulation type automatic document feeder (RD).
FIG. 7 is a cross-sectional view for explaining the configuration of F) 101; as shown in FIG. 6, the stacking tray 310 side is equipped with a feeding unit that constitutes one part of the document feeding unit. This feeding means includes a half-moon roller 331 and a separation / conveyance roller 332.
A separation belt 333, a separation motor SPRMTR,
Registration roller 335, full surface belt 336, belt motor BELTMTR, large conveyance roller 338, conveyance motor FEEDMTE, paper discharge roller 340, flapper 341, recycle lever 342, paper feed stopper 343, paper feed Sensor ENTS, reversing sensor TRN
S, a paper ejection sensor EJTS and the like.

Here, the half-moon roller 331, the separation / conveyance roller 332, and the separation belt 333 are separated by the separation motor SPRMT.
The document is rotated by R to separate the documents one by one from the lowermost part of the document stack S on the stacking tray 310.

Further, the registration roller 335 and the full-face belt 336 rotate the original separated by the belt motor BETMTR and separate the original through the sheet paths a and b to the exposure position (sheet) on the original table glass 102 in FIG. Transport to path c). Further, the large conveyance roller 338 is rotated by the conveyance motor FEEDMTR to rotate the original table glass 102.
The upper original is conveyed from the sheet path c to the sheet path e.
The document conveyed to the sheet path e is ejected by the paper ejection roller 34.
When 0, the originals are returned to the original stack S on the stacking tray 310.

Further, the recycle lever 342 detects one circulation of the original, and when the original feeding starts, the recycle lever 342 is placed on the upper part of the original bundle S, the originals are sequentially fed, and the trailing edge of the final original is placed. When the recycle lever 342 exits, it falls due to its own weight, and one circulation of the document is detected.

In the feeding means 330, when a double-sided original is used,
The document is once guided from sheet paths a and b to c, and then the large conveying roller 338 is rotated to switch the flapper 341 to the dotted line position shown in FIG.
Then, the sheet is passed through the sheet path b by the registration roller 335, and thereafter, the original is conveyed by the full-face belt 336 onto the original table glass 102 and stopped to reverse the original. That is, the original is reversed on the sheet paths c to d and b.

It should be noted that the originals of the original bundle S are passed one by one through the sheet paths a to b to c to d to e and the recycle lever 34.
The number of originals can be counted by transporting the sheet until it is detected that one circulation is made in step 2.

Further, on the right side of the main body of the RDF 300,
The second original document discharge that discharges the sheet document S after the image reading on the document table glass 102 to the side opposite to the carrying-in direction to the document table glass 102 and discharges it to the uppermost part of the document stack S on the document tray 310. A paper path (sheet path g) is configured. A first transport roller 343 and a second transport roller 344 for transporting the sheet original S are arranged in the sheet path g, and the second paper discharge roller 3 is further disposed downstream of the sheet path g.
45 is provided, and the sheet bundle S conveyed through the sheet path g is discharged to the uppermost portion of the document bundle S on the document tray 310.

Above the sheet path g, the document discharge cover 3
46 are arranged. A second paper discharge sensor LOOPEJTS, which is a transmissive optical sensor for detecting the front end and the rear end of the sheet document S in the discharge path, is disposed in the sheet path g.

Next, the swing operation of the document tray 310 will be described. The motor output shaft of the tray swing motor TRAYMTR is coupled to the tray swing arm shaft 348.
A tray swing roller 347 is connected to the lower surface of the document tray 310. The tray swinging roller 347 is provided at the tip of the tray swinging arm 349, and the opposite side of the tray swinging arm 349 is fixed to the tray swinging arm 348. The swing arm 349 swings between the solid line and broken line positions in the drawing, and swings the document tray 310 around the swing center between the solid line position and the broken line position in the drawing.

TRAYUPLMTSW is the original tray 3
The upper limit switch that detects when 10 has reached the upper position (solid line position).
Is a lower limit switch for detecting that the document tray 310 has reached the lower position (broken line position), and the tray swing motor TRAYMTR controls the rotation by detecting these upper and lower limit switches.

The operation corresponding to a plurality of types of inputs, which is a feature of the embodiment of the present invention, will be described below with reference to the drawings.

7 to 14 are flowcharts showing an example of each functional processing procedure in the image forming apparatus according to the present invention. In addition, (1) ... In each figure shows a step.

First, after the power is turned on, the initialization shown in FIG. 7 is performed (1). Next, the operation mode selection key is displayed on the display unit 3001 of the operation panel, and the panel above the selection key is touched to select the mode. It is determined whether the selected mode is the copy mode (2). If the copy mode is selected, the process proceeds to S801 in FIG.

On the other hand, when it is determined in step (2) that the copy mode is not selected, it is determined whether the facsimile transmission mode is selected (3). The procedure moves to step (1) shown in 9.

On the other hand, if it is determined in step (3) that the facsimile transmission mode is not selected,
It is determined whether or not the file mode is selected (4), and when the file mode is selected, the process proceeds to step (1) shown in FIG.

On the other hand, if it is determined in step (4) that the file mode is not selected, it is determined whether the input mode from the computer interface section 7 is selected (5) and the input mode is selected. If is selected, the process proceeds to S1101 shown in FIG.

On the other hand, if it is determined in step (5) that the input mode is not selected, it is determined whether the facsimile reception mode is selected (6) and the facsimile reception mode is selected. If so, the process proceeds to S1201 shown in FIG.

On the other hand, when it is determined in step (6) that the facsimile reception mode is not selected, it is determined whether all the print sheets have been discharged from the main body (7), and all print sheets have been discharged from the main body. If so, the print sheet counter (not shown) is cleared, the process returns to step '(2), and the same processing is repeated. If it is determined in step (7) that all the print sheets have not been ejected from the main body (including the case where printing has not started yet), the process returns to step (2) and the same processing is repeated.

By repeating the above process, for example, when the printer output is being performed one by one, the copy mode is executed so that the plain paper and the thick paper are mixed. Therefore, each mode processing and print processing when plain paper and thick paper are mixed will be described below.

If the copy mode is selected in the judgment of step (2) shown in FIG. 7, the flow shown in FIG. 8 is started, and the initialization of the copy operation is first performed ( In step S801, the keys input from the operation panel are read, copy conditions are set (S802), and the input of the start key 3003 is waited for (S803). Then, by pressing the start key 3003, the document is read by the reader unit 1 (S804), and a paper feeding process described later is performed (S8).
05). Then, the printer process described below is performed (S
806), it is determined whether or not copying of all originals has been completed (S807). Figure 7
Return to step (1) shown in (1). If it is determined in step S807 that copying of all originals has not been completed, step S80
Returning to step 4, the next original is read.

Further, when the facsimile transmission mode is selected in the judgment of step (3) shown in FIG. 7, the flow shown in FIG. 9 is started, and first, the initialization setting of the facsimile transmission is performed ( 1) Read a key input from the operation panel, set facsimile transmission conditions (2), and wait for input of the start key 3003 (3).

Next, when the start key 3003 is pressed, the reader unit 1 reads the document (4) and sends the image data to the facsimile unit 4. The facsimile section 4 performs facsimile transmission according to the set format and the determined protocol (5), and after the transmission is completed, returns to step (1) shown in FIG.

Further, when the file mode is selected in the judgment of step (4) shown in FIG. 7, FIG.
The flow shown in (1) is started, and first, the initialization setting of the file operation is performed (1). A mode selection of file recording or file search is displayed on the operation panel, and a key input from the operator is awaited (2). Next, when the recording key is selected, the recording condition is set (3), the document is read from the reader unit 1 (4), the data is sent to the file unit 5, and the data is recorded in the external storage device 6 of the file unit 5. Yes (5).

On the other hand, when the file search key is selected in step (2), the search condition is set (6),
The file is searched from the external storage device 6 (7) and the result is output. Then, after the file recording or the file search is completed, the process returns to step (1) shown in FIG. 7 for initial setting.

When it is determined in step (6) shown in FIG. 7 that the facsimile reception is performed, the flow shown in FIG. 12 is started, and the facsimile reception is first performed by the facsimile section 4 in FIG. I (S1201), it is determined whether or not the printer unit 2 is in operation (S1202), and if it is not in operation, paper feed processing is continuously performed based on the facsimile reception data (S1204), and printer processing is performed. (S1205). Then, for initialization, the process returns to step (1) shown in FIG.

If it is determined in S1202 that the printer unit 2 is in operation, it is stored in the hard disk 12 of the facsimile unit 4 in FIG. 1 (S1203), and the printer unit 2 is not in operation. To
Move to S1204.

Select one of the above modes with the selection key (3001) on the operation panel of FIG. 3, receive it by the facsimile section 4 of FIG. 1, or detect an external command by the computer interface section 7. To operate.

Some of these operations can be operated in combination at the same time, and some of them can be operated independently at the same time. The core unit 10 controls the priority setting and the like.

The above-mentioned paper feeding process will be described with reference to the flowchart of FIG.

In the paper feed process, first, it is determined whether the requested paper feed sheet is in the paper type setting of the various paper feed trays in FIG. 5 (S1301). The requested paper feed sheet is S11.
The information on the bitmap memory expanded in 02, the received facsimile data, and the copy condition in S802 are set. For example, when the plain paper settings are set for both the trays 1 and 2 and the manual feed tray, and if the requested paper feed sheet is thick paper, the process advances to step S1304 and a display indicating that there is no paper feed tray is displayed on the display unit 3001 in FIG. Then, the procedure returns to step (1) shown in FIG. If it is determined in S1301 that the requested paper feed sheet is in the paper type setting of the various paper feed trays in FIG. 5, it is subsequently determined whether or not there is paper (S1302). The presence / absence of paper is determined by the paper-free detection sensor (not shown) installed for each tray as described above. Then, when there is no paper, the paper-less display is performed on the display unit 3001 of FIG. 3 and the process returns to step (1) shown in FIG.

If it is determined in S1302 that there is paper, a paper feeding operation is performed (S1303), and the process returns.

The above-mentioned printer process will be described with reference to the flowchart of FIG.

First, in the printer processing, it is determined whether or not an image is formed on the fed paper (S140).
1). Whether or not to form an image is determined by, for example, the information on the bitmap memory expanded in S1102 and the reception facsimile in the copy processing, such as the blank sheet processing when processing an odd number of originals in the double-sided copy mode of a single-sided original. It is set by the data or the copy condition of S802.

If it is determined in S1401 that an image is to be formed, an image forming process is performed (S1402). In the image forming process, as described above, the external switching circuit of the image processing unit 110 converts the electric signal in contact with the printer unit 2 into the optical signal modulated by the exposure control unit 201, and the photoconductor 2 is processed.
02 is irradiated. The latent image formed on the photoconductor 202 by the irradiation light is developed by the developing device 203, and the transfer paper stacking unit 204 is timed with the leading edge of the latent image.
Alternatively, the transfer paper is conveyed from the transfer paper stacking unit 205, and the developed image is transferred at the transfer unit 206, which is performed. After S1402, the target fixing temperature is set (S1403). The target fixing temperature is set using the various target temperature tables shown in FIGS. 15, 16 and 17 as described above. After S1403, it is determined whether the fed paper is thick paper (S404). In the case of thick paper in the determination of S1404, the fixing target temperature set in S1403 is changed by the thick paper offset and reset (S1405). Then, the fed sheet is fixed to the fixing unit 20.
The image is formed by passing the sheet through sheet 7 (S140
6). After the paper passed in step S1406 has passed through the paper ejection sensor 401 of the fixing unit 207 (the paper ejection sensor 401 is ON.
(When turned off) (S1407), the print number counter (not shown) is incremented (S140).
8) Return.

If it is determined in step S1401 that the image is not formed, the process proceeds to step S1409 and the developing device 20 described above is used.
The target fixing temperature is set to 0 ° C. without performing all the development processing in 3 and the transfer processing in the transfer unit 206 (S1410). By setting the fixing target temperature to 0 degrees, the fixing heater relay (not shown) is kept OFF. After S1410,
The process proceeds to S1406 and is the same as after S1405.

If it is determined in S1404 that the fed paper is not thick paper, it is determined whether the preceding paper at the time of continuous copying was thick paper (S1411). S14
If the front paper is thick paper in the judgment of S11, S140
The target fixing temperature set in 3 is changed by the amount of the plain paper offset and reset (S1412). If the front paper is not thick paper after the determination of S1412 and S1411, S140
The process proceeds to step 6 and is the same as after S1405.

[0069]

As described above, according to the present invention,
By controlling the fixing target temperature of thick paper, plain paper, etc. for each sheet even when print jobs such as printer output, facsimile output, and copy output are overlapped and print processing occurs continuously, It is possible to perform the optimum image fixing for each paper type.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a composite image forming apparatus using an image heating apparatus of the present invention.

FIG. 2 is a cross-sectional view showing configurations of a reader unit and a printer unit shown in FIG.

FIG. 3 is a plan view showing an example of an operation panel arranged in the reader section shown in FIG.

FIG. 4 is a diagram illustrating an example of a flow of a sheet fed by a fixing unit illustrated in FIG.

5 is a plan view showing an example of a cardboard tray setting screen on the operation panel shown in FIG.

FIG. 6 is a cross-sectional view showing an example of the document feeding device shown in FIG.

FIG. 7 is a flowchart showing a procedure of each function processing.

FIG. 8 is a flowchart showing a procedure of each function processing.

FIG. 9 is a flowchart showing a procedure of each function processing.

FIG. 10 is a flowchart showing a procedure of each functional process.

FIG. 11 is a flowchart showing a procedure of each functional process.

FIG. 12 is a flowchart showing a procedure of each functional process.

FIG. 13 is a flowchart showing a procedure of each functional process.

FIG. 14 is a flowchart showing a procedure of each functional process.

FIG. 15 is a diagram showing an example of a target temperature table.

FIG. 16 is a diagram showing an example of a target temperature table.

FIG. 17 is a diagram showing an example of a target temperature table.

FIG. 18 is a diagram showing an example of an output power setting table.

FIG. 19 is a diagram illustrating an example of power control in a fixing device.

FIG. 20 is a timing chart showing an example of changing the target temperature in the fixing device.

Claims (4)

[Claims] 1. A heating member for heating an image on a recording material, a temperature detection element for detecting the temperature of the heating member, and an energization control means for controlling energization so that the temperature detected by the temperature detection element maintains a set temperature. In the image heating apparatus having the following, when heating the second recording material while continuously heating the first recording material, it is possible to switch to a set temperature according to the second recording material. apparatus. 2. When the first recording material is heated at the first set temperature after the second recording material is heated at the second set temperature while continuously heating the first recording material at the first set temperature. The image heating apparatus according to claim 1, wherein a temperature different from the set temperature is set. 3. The heating member is a heating element that generates heat when energized, and the apparatus further includes a film that moves together with the recording material while sliding on the heating element, and an image on the recording material passes through the film. The image heating apparatus according to claim 1, wherein the image heating apparatus is heated by a heating element. 4. The image heating apparatus according to claim 1, wherein the apparatus is used in an image forming apparatus having a continuous printing function and a facsimile function.