JP2000075760A - Printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing device capable of achieving a copying function whose speed is unaffected by the processing speed of a host computer and of always forming optimum images. SOLUTION: The condition of an engine is normally controlled to transit from a printing condition immediately to a postprocessing condition after the current printing is finished. If, for a printer engine control part in printing action, a command to inhibit transition to the next condition is issued from a reader controller at the current predetermined printing timing, the condition of the engine is not allowed to transit to the postprocessing condition or the next printing condition after the current printing is finished but to transit to a printing standby condition in which the printer engine, while held operated, waits for the command to permit transition to the next condition to be sent from the reader controller. While the printer engine is waiting, fixing temperature control different from fixing temperature control for the printing action and used exclusively for the printing standby condition is executed. If the command to permit transition to the next condition is issued from the reader controller at predetermined timing after transition while the engine printer is in the printing standby condition, the engine is restored to a printing condition at predetermined printable timing and the fixing temperature control for the printing action is re-executed to print the next print image data transmitted from the reader controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus having both a printing function and a copying function.

[0002]

2. Description of the Related Art A conventional printing apparatus has realized a printing function with a configuration as shown in FIG. That is, the printing device is
A host computer 2104, a printer 2102,
The printer controller 2103 sends out the image data sent from the host computer 2104 in accordance with the operation of the printer 2102.

FIG. 21 shows a configuration of a printing apparatus provided with an image reading function by adding an image reading device 2501 to the configuration shown in FIG. 17 and connecting the image reading device 2501 to a host computer 2104 via a network or directly.
Further, a printer function and a copying function are realized by changing the configuration as shown in FIG. That is, a reader unit 2501 that reads a document, a controller unit 2602 that enables the printer controller 2103 shown in FIG. 17 to communicate with the reader unit 2501, and a selector unit that selects one of the reader unit 2501 and the controller unit 2602. 2603, reader unit 2501 and controller unit 26
The communication device 2601 and the communication line 2601 constitute a printing device.

[0004]

However, in the configuration shown in FIG.
01 can be provided by printing the image read at 01 on the printer 2102.
05 and the host computer 2104, the processing speed and the transmission speed are slow, and there is a problem that an output cannot be obtained in real time.

In the configuration shown in FIG. 22, in order to provide a copying function, the controller unit 2602 sends an I / F to the printer controller 2103 shown in FIG. Is required, and requires significant changes in both hardware and software.

Further, in the case where the configuration as shown in FIG. 22 is adopted, in a printer which takes a long time for a post-processing step after completion of printing including complete cleaning of a photosensitive drum and a transfer belt which is executed after completion of printing on the printer, When a user prints a plurality of originals using the original reading device 2501, the printer engine 2102 determines that the next print start signal will not be received during the document exchange time after the end of printing the first original, and performs post-processing. Because of the transition to the state, there is a problem that the user must wait for the post-processing to be completed before printing the second and subsequent originals.

Further, when an automatic document feeder is installed on a document reading device as a copying function, if the document exchange time of the automatic document feeder for continuous printing is long, the printer engine starts printing during the document exchange time. It is determined that there is no signal, and transition to the post-processing state occurs.Therefore, there is a problem that the transition to the post-processing state occurs during continuous printing. For this reason, the next state transition is prohibited from the reader controller at a predetermined timing. By issuing the command, it is possible not to enter the post-processing state immediately after the end of the current document printing, but also to shift to the printing standby state while keeping the printer engine operating, and to make the printer stand by. The next printing can be started without shifting to the post-processing state of the printer. Although the paper was absorbed during printing, the previous paper is discharged, so there is no longer a place for heat to escape, and the overshoot characteristic of the fixing roller causes the surface temperature of the fixing roller to be lower than the temperature during printing operation. In the worst case, there is a problem that the fixability in the next printing may be affected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to realize a copying function which can add a reader without changing a printer controller and which is not limited by the processing speed of a host computer. Another object of the present invention is to provide a printing apparatus capable of always forming an optimum image without adversely affecting the image formation of the next job.

[0009]

In order to achieve the above object, an invention according to claim 1 is an engine control unit for controlling recording paper conveyance and image forming control of a printer, and setting and operation of the engine control unit. Or a printer controller that sends an image sent from an external computer or the like at the timing desired by the engine control unit,
A document reading device, a reader controller for controlling the document reading device and processing image data output from the document reading device and transmitting an image at a timing desired by the engine control unit; In a printing device configured by inserting the reader controller between controllers, usually, the state of the engine is controlled to transition from the printing state to the post-processing state immediately after the current printing is completed, and the printing operation is performed. If a next state transition prohibition command is issued from the reader controller to the current printer engine control unit at a predetermined timing of the current printing, the printer controller does not transition to the post-processing state or the next printing state after the current printing is completed. And waits for a next state transition permission command from the reader controller while operating the printer engine. After transitioning to the standby state during printing, the printer performs standby temperature control during printing, which is different from the control for fixing temperature during printing operation. When the next state transition permission command is issued, the engine is returned to the print state at a predetermined timing at which printing is possible, the fixing temperature control during the printing operation is executed again, and the next print image data sent from the reader controller is printed It is characterized by doing.

According to a second aspect of the present invention, in the first aspect of the invention, the timing of switching from the fixing temperature adjustment control during the printing operation to the fixing temperature adjustment control in the standby state during printing is set immediately before the paper is discharged. It can be switched.

According to a third aspect of the present invention, in the first aspect of the present invention, a next state transition permission command is not issued until a predetermined settable time elapses after the printer engine transitions to the printing standby state. Change to the post-processing state, and in the post-processing state, execute the fixing temperature control in the normal standby mode, which is not the fixing temperature control in the printing operation nor the fixing temperature control in the printing standby state. It is characterized by doing.

According to a fourth aspect of the present invention, in the first aspect of the invention, each of the fixing temperature adjustment controls includes setting a predetermined temperature adjustment target temperature and performing control so as to maintain the target temperature. Features.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the temperature target temperature for the fixing temperature control in the standby state during printing is the target temperature for the fixing temperature control during the printing operation. , And is set to be higher than the target temperature for the temperature control of the fixing temperature control during standby.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[Overall Configuration] FIG. 1 is a configuration diagram of a printing apparatus according to the present invention. In FIG. 1, 101 is a reader frame, 102 is a document table, 103 is a light source, 104 is a photoelectric conversion unit, and 105 is a photoelectric conversion unit. The analog-to-digital converter 106 is a reader controller.

Reference numeral 2001 denotes a printer main body; 2002, a DC controller for controlling paper transport and image formation of the printer; and 2003, an image forming unit. 2103 is FIG.
7 is a printer controller, which is shown in FIG.
As shown in FIG.

A host computer 2104 shown in FIG. 17 is connected to the printer controller 2103 via a one-to-one or network 2105.
004 is a paper cassette deck that can be added as an option,
Reference numeral 2005 denotes a sorter that can be added as an option, and reference numeral 2006 denotes an optional controller that controls the sheet cassette deck 2004 and the sorter 2005.

The reader controller 106 is a motor control unit (not shown) for processing a digital image output from the analog-to-digital conversion unit 105 and reading a document, and a communication control with the DC controller 2002 and the printer controller 2103. It has the function of performing In the present embodiment, the reader controller 1
06 in the printer main body 2001 and the DC
Controller 2002 and printer controller 2103
A configuration that does not include an external cable for controlling communication with the device is employed.

[Configuration of Printer Controller and Printer] In this embodiment, the printer controller 2103
The reader controller 106 is connected between the printer controller 2103 and the printer 2102.
The processing is performed with respect to. Here, the configuration of the printer controller 2103 and the printer 2102, which are the premise thereof, will be described first.

First, the overall configuration will be described with reference to FIG.

In FIG. 17, reference numeral 2101 denotes a video I / F.
The video I / F 2101 performs communication between a printer 2102 and a printer controller 2103, which will be described later. The details of each signal of the video I / F 2101 will be described later.

Reference numeral 2102 denotes a printer.
An electric image signal received via the I / F 101 is formed in a visible form, transferred to a recording sheet, and output after fixing. In order to realize these image forming sequences, various loads are controlled. In addition, the printer 2102
, And notifies the printer controller 2103 of the state.

Reference numeral 2103 denotes a printer controller;
This is the host computer 2104 or network 2
The data transmitted through 105 is received. This is because bitmap data and PDL (Page Description L
anguage) Sent in various formats such as description data. The data is expanded in a memory and transferred to the printer 2102 as raster data. In this manner, the data created by the host computer 2104 can be output to a printer.

Next, the video I / F 2101 connecting the printer controller 2103 and the printer 2102 will be described in detail.

In the connection diagram shown in FIG. 2, reference numeral 2103 denotes a printer controller; and 2002, an engine control unit (DC controller) for controlling an engine provided inside the printer 2102 shown in FIG. Then, the printer controller 2103 and the engine controller 2
During 002, signals are exchanged as shown.

FIG. 3 shows a list of signals of the video I / F 2101. Here, only the representative signals shown in FIG. 2 will be described.

First, / PPRDY of 203 is the printer 2
This signal indicates that communication with the printer controller 2103 has become possible after power is supplied to the printer 102 and processing such as initialization has been completed.

The signal / CPRDY 204 is a signal indicating that power has been supplied to the printer controller 2103 and communication with the engine control unit 2002 has been enabled after processing such as initialization has been completed.

A / RDY signal 205 is a signal indicating that the engine control unit 2002 can perform a printing operation in response to a print start instruction (a / PRNT signal described later) from the printer controller 2103. The condition that this signal becomes true depends on whether the temperature inside the fixing unit has reached a predetermined temperature,
This is only when each part of the printer 2102 is operating normally, such as whether the recording paper remains in the printer 2102 or whether the polygon mirror is rotating at a predetermined speed.

The / PRNT signal 206 is a signal for the printer controller 2103 to instruct the engine control unit 2002 to start or continue a printing operation.

A / TOP signal 207 is a synchronization signal which is passed from the engine control unit 2002 to the printer controller 2103 and serves as a reference for vertical scanning of an image.
This signal is output a predetermined time after the / PRNT signal of 206 is output from the printer controller 2103.

The / LSYNC signal 208 is a synchronization signal that is used as a reference for horizontal scanning by the printer controller 2103. Similar to the / TOP signal, the printer controller 2103 outputs the / PRNT signal from the printer controller 2103 a fixed time later. Is output to

The / VCLK signal of 209 is a signal / VD described later.
A synchronous clock for the OEN and / VDO signals,
The printer controller 2103 generates a clock having a frequency corresponding to the image signal.

The / VDOEN signal 210 is a signal for controlling the capture of the image signal output from the printer controller 2103 into the engine control unit 2002. The engine control unit 2002 detects whether this signal is TRUE / FALSE in synchronization with the / VCLK signal,
In the case of, the image signal is fetched, and in the case of FALSE, the fetch is not performed.

The / VDO signal 211 is image data. The printer controller 2103 outputs the / TOP signal in the vertical direction and the / LSYNC signal in the horizontal direction in synchronization with the / VCLK signal.

The / CCLK signal 212 is a synchronous clock used when the printer controller 2103 sends a serial command to the engine controller 2002 and when the engine controller 2002 returns a serial status to the printer controller 2103. Output from the controller 2103.

The / CBSY signal 213 indicates that the printer controller 2103 is transmitting a serial command using the / CMD signal described later.
02.

The / CMD signal 214 is a signal used when the printer controller 2103 transmits serial information to the engine control unit 2002, and the serial information will be referred to as a command.

The / SBSY signal 215 is a signal indicating to the printer controller 2103 that the engine control unit has returned a serial status using the 2002 / STS signal.

For the / STS signal 216, the engine control unit 2002 calls the printer controller 2103 the serial information called status.

The / CCRT signal at 217 is output to the printer 21
02 is a signal for reporting to the printer controller 2103 when the internal status changes. When the printer controller 2103 receives this report signal, it issues a command inquiring about what has changed in the state of the engine using the / CMD signal, and the engine control unit 2002 notifies the state with the / STS signal. .

Next, the printer 2102 controlled by the engine control unit 2002 will be described with reference to FIG. still,
FIG. 4 is a cross-sectional view of the printer 2102.

In FIG. 4, reference numeral 401 denotes a scanner;
The scanner 401 receives the image signal / VDO sent from the printer controller 2103, converts it into a laser beam, and irradiates the photoconductor 402 to form an image on the photoconductor 402. The photoconductor 402 reaches the color developing device 403 and the black developing device 404 while rotating clockwise. The developing devices 403 and 404 function to load (develop) the toner on the photoconductor 402 according to the electric charge charged on the photoconductor 402. When the image is black and white, only the black developing device 404 operates, and when the image is color, both the color developing device 403 and the black developing device 404 are used.

Next, the image formed on the photosensitive member 402 is transferred to the intermediate transfer member 405 rotating clockwise.
This intermediate transfer member 405 completes image formation on the intermediate transfer member 405 by making one rotation for black and white and four rotations for color.

On the other hand, the recording paper fed from the upper cassette 408 or the lower cassette 409 by the pickup rollers 411 or 412 is transported along the paper feed rollers 413 or 414, and further transported by the transport rollers 415 to the position before the registration.

The timing is controlled so that the recording paper comes between the intermediate transfer member 405 and the transfer belt 406 at the timing when the image formation on the intermediate transfer member 405 is completed. When the recording paper reaches between the intermediate transfer member 405 and the transfer belt 406, the transfer belt 406
05, the toner is transferred to the recording paper. The image transferred to the recording paper is fixed on the recording paper by heat and pressure by a fixing roller 407.

The recording paper on which the image has been fixed is conveyed to one of a face-up discharge port 417 and a face-down discharge port 418 specified in advance by the printer controller 2103 and discharged.

As described above, the printer controller 210
3 can be output.

Next, the timing of signals exchanged between the video I / Fs 2101 is shown in FIG. FIG. 5 shows video I
/ F2101 according to the lapse of the signal time.

First, when the printer controller 2103 completes the preparation of image information, the / PRNF signal is set to Low.
(True) and inform the engine control unit 2002. At the same time, an image synchronizing signal /
A VCLK signal is also generated.

In response, engine control unit 2002
Performs various settings inside the printer 2102, and when the image can be received, the / TOP signal and / L
An SYNC signal is output to the printer controller 2103. In accordance with the vertical synchronization signal / TOP signal and the horizontal synchronization signal / LSYNC signal, the printer controller 2103 converts the image signal / VDO signal and the image valid signal / VDOEN signal into the engine control unit 2.
002.

Next, what commands and status are exchanged by serial communication during these printing operations will be described. FIG. 6 shows the printer controller 21.
3 shows the timing of communication between the engine control unit 2003 and the engine control unit 2002.

First, the case where the lowermost / CCRT signal is not used will be described.

When the printer controller 2103 wants to issue a command to the engine control unit 2002, it sets the / CBSY signal to low (true) and sends command data to the / CMD signal in synchronization with the clock signal / CCLK. The engine control unit 2002 that has received it,
After confirming that the / CBSY signal is High (false), / SBSY is set to Low (true) to synchronize the engine-side status data corresponding to the command with the / CCLK signal generated from the print controller 2103. / STS. This status data is received by the printer controller 2103, and print control is continued or interrupted depending on the state.

Next, the / CCRT signal will be described.

The / CCRT signal is a signal that goes low (true) when a change occurs in the state of the engine specified by the printer controller 2103 in advance. For example, the printer controller 2103 preliminarily sets the / CMRT signal so that the / CCRT signal is made effective when the paper runs out.
Suppose that it was set by the D signal. So the remaining recording paper is 1
It is assumed that there are only two sheets and the printer controller 2103 issues a printout request for two sheets. For the first sheet, the print sequence operation is normally processed without any problem. However, 2
At the stage where the second sheet of image formation is started because there is no second sheet of recording paper, the printer engine detects the change in the state and changes the / CCRT signal from High to Low. This signal is transmitted to the printer controller 2103. Upon detecting this, the printer controller 2103 returns a paper feed unit paper presence status to the printer controller 2103 to the engine control unit 2002 in order to know which paper feed cassette is out of paper. / CCRT signal returns status / SBSY
The signal is cleared to High when the signal becomes Low.

Here, more specifically, the exchange of commands / status between the print controller 2103 and the engine control unit 2002 is shown in FIG. 7, and the printing operation will be described based on this. Here, a color output is assumed.

When a print start request is issued, the printer controller 2103 sends a printer 210 request to the engine control unit 2002 while performing image data conversion processing and the like.
Check the ready status of 2. Next, a command for designating the paper feed stage of the recording paper is issued. Further, a command for requesting the recording paper size in the designated cassette is issued. The engine control unit 2002 responds to these series of commands.
Returns the corresponding status.

Next, the discharge port is determined by the command for specifying the discharge port, and a page mode designation command for designating how many pages of the image are formed is issued. Finally, by issuing a command for specifying monochrome / color, all settings on the printer 2102 side are completed.

Thereafter, the printer controller 2103 sends a print request / PRN to the engine control unit 2002.
Generate a T signal. In response to this, a / TOP signal is returned from engine control unit 2002 for a predetermined time. The vertical scanning direction is synchronized with this / TOP signal, and / LS
Synchronize the YNC signal in the horizontal direction with the / VDO signal to / V
The image is transferred to the engine control unit 2002 in synchronization with the CLK. Here, since the color mode is set, / TO
The P signal is generated four times to form an image for four colors of cyan, magenta, yellow and black.

After the final / TOP signal is generated,
Return the PRNT signal to High (false). Accordingly, the engine control unit 2002 detects that the print request has been completed, and shifts to post-processing such as a cleaning operation of the intermediate transfer body 405. The transferred recording paper is further fixed to a fixing roller 407.
After passing through, the paper is discharged to a specified paper discharge port. Finally, the printer controller 2103 includes the engine control unit 20
02, it is confirmed that the recording paper is not in the recording paper transport state (discharge completion), and then the printing is completed, and the apparatus stands by in a ready state until the next print request is issued.

If an illegal state such as a recording paper jam, the absence of the recording paper, or the opening of the door by the user occurs during the operation as described above, the engine control unit 2002 immediately sends the printer 2102 from the engine control unit 2002 using the above-mentioned / CCRT signal. The abnormality is transmitted to the printer controller 2103. Then, the printer controller 2103 performs a corresponding process accordingly.

The processing performed between the printer controller 2103 and the printer (engine control unit) 2102 has been described above.

FIG. 16 is a configuration diagram of a printing apparatus having the electrical configuration described above.

In FIG. 16, reference numeral 2001 denotes a printer main body; 2002, a DC controller for controlling paper conveyance and image formation of the printer 2102; and 2003, an image forming unit. Reference numeral 2103 denotes a printer controller in FIG. 17, which is a printer controller 2 shown in FIG.
001.

A host computer 2104 shown in FIG. 17 is connected to the printer controller 2103 on a one-to-one basis or via a network 2105.
2004 is a paper cassette deck that can be added as an option; 2005 is a sorter that can be added as an option;
An optional controller 6 controls the sheet cassette deck 2004 and the sorter 2005.

[Structure when Reader Controller is Attached] FIG. 8 shows not only the image data output from the printer controller based on the data transferred from the computer to the printing apparatus described above, but also the original image on paper. FIG. 4 is a cross-sectional view when a reader controller that reads in, converts into a digital signal, and outputs the digital signal is attached.

In FIG. 8, reference numeral 801 denotes a document feeder for conveying a document to a portion where the document is optically read, reference numeral 802 denotes an optical reader, and reference numeral 805 denotes a platen glass. The document feeding device 801 is driven in synchronization with the optical reading device 802,
The original feeding device 801 changes the original image to the original glass 8.
When the optical reading device 802 is transported on the optical disc 05, the optical reading device 802 scans the image while moving in the left-right direction of FIG. Reference numeral 803 denotes a printer main body.

FIG. 9 is a block diagram showing the connection between the printer controller 2103 and the engine control unit 2002 shown in FIG.
FIG. 2 is a configuration diagram showing an electrical connection when the device 1 is mounted.

In FIG. 9, reference numeral 901 denotes a reader controller, which is disposed at an electrical intermediate point between the printer controller 2103 and the engine control unit 2002 in FIG. Between the printer controller 2103 and the reader controller 901 and the engine controller 2
The type of signal line between the 002 and the reader controller 901 has the same function as the type of signal line shown in FIG. However, since the signals between the printer controllers 2103 and the signals between the engine control units 2002 are physically different, the signal names are distinguished by attaching C to the former and P to the latter.

Reference numeral 902 denotes an image signal processing unit; 903, a document scanning optical system control unit for controlling the optical reading device 802; and 904, a document feeding control unit for controlling the document feeding device 801. is there. Reference numeral 905 denotes an operation unit, and 906 denotes an image input unit. The image signal converted by the photoelectric conversion unit 804 is input from the image input unit 906, and is transferred to an image signal processing unit 902 inside the reader controller 901.

Next, the configuration of the reader controller 901 will be described with reference to the block diagram of FIG.

In FIG. 18, reference numeral 901 denotes the reader controller shown in FIG. 9, 902 denotes the image processing unit shown in FIG. 9, and 906 denotes the image input unit shown in FIG. 2201
Is a selector that selects either the output of the image processing unit 902 or the signal sent from the printer controller 2103 and outputs the selected signal to the engine control unit 2002.
The signal system switched by the selector 2201 is an image clock /
VCLK, image enable / VDOEN, image data /
There are three VDOs. 2202 is an engine control unit 200
Serial communication controller for communication with
Reference numeral denotes an input / output port for exchanging signals for supplementing communication in the serial communication controller 2202.

Reference numeral 2204 denotes an interrupt controller to which an image leading end request signal / PTOP and a printer status change signal / PCCRT are input. 2205 is the printer controller 21
Serial communication controller 220 that communicates with communication device 03
Reference numeral 6 denotes an input / output port for exchanging signals for supplementing communication in the communication controller 2205, and 2207 denotes a gate.
This gate 2207 controls whether a signal sent from the printer 2102 is sent to the printer controller 2103 or not. The gate control is performed on the image leading end request signal / TOP and the line synchronization signal / LSYNC.

Reference numeral 2208 denotes a control circuit having a gate function and a flag setting function.
Control the CRT. The printer status change signal / issued by the engine control unit 2002 by opening / closing the gate 2207
By controlling whether or not to transmit the PCCRT to the printer controller 2103, and by setting a flag, a printer state change signal / C is transmitted from the reader controller 901.
A CRT can be issued to the printer controller 2103. In addition, 2209 is C which controls the whole.
PU.

[Operation at Copying] A method for reading a full-color original image and outputting it from the image forming apparatus will be described.

When a copy start key (not shown) on the operation unit 905 is input, the reader controller 901 operates the gate 2207 and the signal control 22 for the copy mode.
08 is closed, and the selector 2201 is set so that the output of the image processing unit 902 is selected.

Next, the ready state signal / PRDY of the printer 2102 is checked for the engine control unit 2002 using the input / output port 2203. Next, various settings are performed using the serial communication controller 2202. First, a command for designating a paper feed stage for recording paper is issued. Further, a command for requesting the recording paper size in the designated cassette is issued. The engine control unit 2002 returns a status corresponding to these series of commands.

Next, the discharge port is determined by the command for specifying the discharge port, and a page mode designation command for designating how many pages of the image are formed is issued. Finally, by issuing a command for specifying monochrome / color, all settings on the printer 2102 side are completed.

After the document is fed onto the document table by the document feeder 801, the reader controller 901 generates a print request / PPRNT signal to the engine control unit 2002. In response to this, the engine control unit 2002 returns a / PTOP signal after a predetermined time. This is processed by the interrupt controller 2204, and / PTO
The optical reader 802 is operated so as to synchronize with the P signal. The vertical scanning direction is synchronized with this / PTOP signal,
Further, by synchronizing the / PLSYNC signal in the horizontal direction and / PV
The DO signal is synchronized with the / PVCLK signal, and the signal input from the photoelectric conversion device 804 to the image processing unit 902 is transferred to the engine control unit 2002. Here, since the color mode is set, the optical reading device 802 is operated four times,
An image for four colors of cyan, magenta, yellow, and black is formed for the / PTOP signal generated four times.

Then, after generation of the final / PTOP signal,
Return the / PPRNT signal to High (false). Accordingly, the engine control unit 2002 detects that the print request has been completed, and shifts to post-processing such as a cleaning operation of the intermediate transfer body 405. Further, the transferred recording paper passes through the fixing roller 407 and is discharged to a designated discharge port.
Finally, the reader controller 901 confirms to the engine control unit 2002 that the recording sheet is not in the recording sheet conveyance state (end of sheet ejection), and then ends printing, and waits in a ready state until the next print request occurs.

[Operation During Printing] A method for outputting an image from the printer controller 2013 from the image forming apparatus will be described.

At the stage when the copying operation has been completed, the reader controller 901 enters the ready state. At this time, the reader controller 901 opens the gate 2207 and the control circuit 2208 for printing operation. The reader controller 901 sends a printer 2102 to the engine control unit 2002 using the input / output port 2203.
The ready status signal / CRDY of the printer 2102 is set to the printer controller 2103 by using the input / output port 2206 if OK.

Next, the printer controller 2103 performs communication for performing various settings, and the reader controller 901 transmits the communication to the serial communication controller 2205.
And interpreted by the CPU 2209. According to the contents, the reader controller 901 performs various settings using the serial communication controller 2202. The engine control unit 2002 responds to a series of commands.
Returns a corresponding status to the reader controller 901, and the reader controller 901 receives the status using the serial communication controller 2202. The received contents are interpreted by the CPU 2209, and this time, the serial communication controller 2205 is used to communicate with the printer controller 2103.

Next, the printer controller 2103 sends a print request / C to the reader controller 901.
An ORNT signal is generated, and the reader controller 901 receives the signal and generates a print request / PPRNT signal to the engine control unit 2002. In response to this, the engine control unit 2002 returns a / PTOP signal after a predetermined time. This is passed through the gate 2207,
This is returned to the printer controller 2103 as a CTOP signal. The printer controller 2103 synchronizes the / CTOP signal in the vertical scanning direction, and further synchronizes the / PLSYNC signal in the horizontal direction with the / CLSYNC signal that has passed through the gate 2207, synchronizes the CVDO signal with / CVCLK, and sends the signal to the reader controller 901. And transfer. In the reader controller 901, the selector 22
01 is set to select the signal sent from the printer controller 2103, and the signal sent from the printer controller 2103 is / PVCLK,
Engine control unit 20 as / PVDOEN, / PVDO
02.

[Difference Between Printing Operation and Copying Operation] Here, the difference between the printing operation and the copying operation will be described with respect to the image sending timing.

Although a detailed description of the configuration of the printer controller 2103 is omitted, the printer controller 2103 has an image memory therein, and image data for printing is prepared in advance there. Therefore, the time required for outputting the print data / VDO signal in response to the image leading end request signal / TOP signal sent from the engine control unit 2002 is only the electrical delay time.

On the other hand, in the copy mode,
The original is read while the optical reading device 802 is moved, and image data is output.

As shown in FIG. 20, the optical reading device 802
It takes a time for acceleration, for example, about several hundred msec, from the state where the document is stopped to the state where the document is moving at a high speed for reading the document. Therefore, if the engine control unit 2002 sends the image leading end request signal / TOP signal in the copy mode at the same timing as the signal in the print mode, the print image data / VDO reaches the engine only in the copy mode. Will be delayed by several hundred msec. There are the following two plans to address this.

1) The / TOP signal is transmitted earlier during copying than during printing. 2) Provide another signal (RSTART) for the copy mode. Above 1) To execute the plan, the reader controller 901
18 may be the same as that shown in FIG. 18. In the copy mode, the reader controller 901 starts moving the document reading device 802 by the / TOP signal.

In order to execute the above 2) plan, the configuration shown in FIG. 19 may be used. That is, the engine control unit 2002
Is a signal required only when the printer controller 2103 performs printing, and need not be input to the interrupt controller 2204 of the reader controller 901. The reading device movement start request signal / RSTART sent from the engine control unit 2002 is a signal required only in the copy mode, and need not be sent to the printer controller 2103.

[Control for Setting Command] Next, the characteristic control of the present invention will be described.

The communication between the printer controller 2103 and the engine control unit 2002 is as follows because the reader controller 901 is connected between the printer controller 2103 and the engine control unit 2002.

When the reader controller 901 reads and outputs a document image using the engine control unit 2002 (copier mode), the printer controller 21
A case where a setting command (for example, a paper feed cassette change command 9) is issued from 03 to the printer 2102 will be described.

FIGS. 10 and 11 are flowcharts showing a command issuing sequence when the reader controller 901 does not enter between them (that is, in the configuration shown in FIG. 2). FIG. 10 shows a processing sequence in the printer controller 2103, and FIG.
3 shows a processing sequence.

After issuing the paper feed cassette change command, the printer controller 2103 waits for a response from the engine control unit 2002. When the response comes, the printer controller 2103 determines the success of the command, and terminates the series of command issuing sequence. The engine control unit 2002 includes a printer controller 210
When the command is received from the printer 3, the content of the command is determined. In the case of the paper feed cassette change command, the printer controller 2103 is notified of the successful command execution when the change is successful.

[Control for State Change Signal] Next, in the configuration in which the reader controller 901 is interposed, the state change on the engine side, for example, the occurrence of some error state / engine control unit using the PCCRT. Processing when the data is transmitted from the 2002 side to the reader controller 901 will be described.

In the case of the configuration in which the reader controller 901 is interposed, there is a possibility that the state change desired by the reader controller 901 and the printer controller 2103 is different. For example, there is a case where a state change occurs such that the paper being transported is jammed.

If a jam occurs while the engine is performing a copying operation under the control of the reader controller 901, this state is a state that only the reader controller 901 wants to know. The printer controller 2103 is not in the process of outputting a jam, and therefore cannot perform appropriate post-processing even if notified of this state.

If a control system equivalent to the reader controller 901 is to be mounted, both controllers 901 and 901
103 also has the jam processing control software that the other should have, so that it is redundantly mounted, and a lot of waste occurs in design man-hours, quality evaluation and software capacity.

Therefore, basically, it is sufficient to notify the printer controller 2103 in the print mode and notify the reader controller 901 in the copy mode. However, even in the copy mode, the printer controller 2103 may want an engine state change signal in some cases. For example, it is necessary to notify the printer controller 2103 of information such as a change in the cassette size and the absence of paper. These signals are output from the controllers 901 and 21 after the state change signal is issued by the engine control unit 2002.
The time until the processing is performed in 03 is not strictly asked.

Therefore, the following processing is performed.

That is, in the copy mode in which the reader controller 901 controls the engine control unit 2002, the state change signal / PCCRT notified from the engine control unit 2002 is notified using the gate function of the control circuit 2208. The printer controller 2103 is masked, and only the reader controller 901 receives the data through the interrupt controller 2204. The reader controller 901 performs processing according to the control flow of FIG. That is, when the / PCCRT signal becomes true, the reader controller 901 issues a command for acquiring a state change to the engine control unit 2002. After that, the status of the engine is checked to see the status change. Then, the contents are stored in the printer controller 2.
It is determined whether or not the content is to be notified to 103 as well. For example,
A state change such as a change in the size of the sheet cassette is notified. If it is determined to notify, the control circuit 2
208, the flag is set, and the state change signal / CC
A CRT is generated to notify the printer controller 2103.

In the printer mode in which the printer controller 2103 controls the engine control unit 2002, the gate function of the control circuit 2208 is released, and the state change signal / PCCRT notified from the engine control unit 2002 is changed. The signal is sent to the printer controller 2103 as a signal / CCCRT.

[Control for Execution Command] Next, control of the execution command will be described.

For example, the printer controller 2103 and the reader controller 901 are connected to the engine controller 2002
The following describes how the reader controller 901 controls a case where a use request is issued at the same time.

FIG. 13 is a diagram showing the location of data and the exchange of data when a print request is issued during a copy operation. At this time, the engine control unit 2002 transmits the image signal / PVDO sent from the reader controller 901.
To form an image. The operation is, as described with reference to FIG.
Settings such as the image forming mode are set by the reader controller 9
01 and the engine control unit 2002 have already been set.

Reference numeral 1301 denotes a buffer for setting various settings.
The reader controller 901 operates the engine control unit 2 by itself.
002 and printer controller 2103
Stored in the engine control unit 2002. Of the various setting values shown in the buffer 1301,
The specified value described above is stored in the set value for the reader. Here, when a print request is issued from the printer controller 2103 during the copy operation, it is difficult to think that the printout is performed by interrupting the copy operation from the viewpoint of usability. Therefore, the print request in this situation is postponed until the copying operation is completed.

However, / CSTS must be returned in response to / CCMD from the printer controller 2103. Therefore, among the set values of the buffer 1301, PDL
Only the setting value from the printer 2102 is set as the setting value for the printer according to the request. Only the setting value from the printer 2102 is set as the setting value for the reader and the setting value for the PDL in response to a request. When the setting value for the reader is different from the setting value for the PDL, the setting may be performed from the reader controller 901 to the engine control unit 2002 before the copying operation is completed and the printer operation is started. The following is a description of a specific example.

At present, the copying operation is being performed, the paper is fed from the upper cassette, and the paper is discharged to the face-up discharge port. The image forming mode is set to the color mode based on the determination that the original is color. Suppose. Here, when a print request is issued from the printer controller 2103, the print execution itself is postponed, but various settings can be made. Here, it is assumed that the print request is a request to feed paper from the upper cassette, discharge the paper to the face-down discharge port, and further output a monochrome image. Regarding the sheet cassette designation, both the reader controller 901 and the printer controller 2103 designate the upper cassette. Therefore, even when the copy operation is completed and the operation is switched to the print operation, there is no need to issue a paper feed cassette designation command to the engine control unit 2002.
Since the designation of the discharge port and the image forming mode is different between the copy operation and the print operation, the command for specifying the discharge port and specifying the image forming mode is sent from the reader controller 901 to the engine control unit 2002 when the copy operation is completed. Need to be issued.

As described above, the reader controller 90
No. 1 does not judge that a command from the printer controller 2103 is only postponed to execute the command to the engine control unit 2002, but also determines that the reader controller 901 has already set the command to the engine control unit 2002. Is determined not to be set repeatedly.

Next, a case where a copy request occurs during a printing operation will be described with reference to FIG. in this case,
In contrast to the case of FIG. 13, from the viewpoint of usability, even if the user presses the copy button in front of the copying machine, it is better to be able to execute the copy operation in an interrupted manner than to be able to copy during the print operation.

In this case, the printer controller 2103
/ CVDO sent from the controller 2201 is selected by the selector 2201 and sent to the engine control unit 2002 as / PVDO. With the same settings as described in FIG. 13,
It is assumed that the settings from the printer controller 2103 are the upper cassette, the face-down discharge port, and the monochrome image mode. Since the engine control unit 2002 can detect the end only when the / PPRNT signal from the printer controller 2103 becomes High (false), the engine control unit 2002 does not know how many printouts will be made. Here, the printer is 4
Suppose you are trying to print out a few images. If the reader does not interrupt and request a copy operation, four / PTOP signals are generated from the engine control unit 2002 as shown in the image timing shown in FIG.
In response, the image is transmitted from the printer controller 2103 to the engine controller 2 via the reader controller 901.
002.

Therefore, it is assumed that an interrupt copy request to copy one color document is issued to the reader controller 901 during the second printout. This will be described with reference to FIG.

/ C from printer controller 2103
The PRNT request causes the reader controller 901 to
A PPRNT request is issued to the engine control unit 2002, and a / PTOP signal is supplied from the engine control unit 2002 to the printer controller 2103 as a / CTOP signal via the reader controller 901. In this way, the printing operation of the first image 1501 and the second image 1502 is executed.

Here, a case will be described in which the reader controller 901 generates an interrupt copy request during the printout operation for the second sheet.

The reader controller 901 generates a / CCCRT signal for the printer controller 2103. This is not that the state of the engine has actually changed, but the reader requests the printer controller 2103 to open the engine in order to acquire the printer engine. The method of generation is as described above in the control unit 2
208 is used. In response to the / CCCRT signal, the printer controller 2103 issues a command for checking the status status of the engine, and the reader controller 901 returns a status of “copying” to the printer controller 2103. Then, the printer controller 2103 outputs / CPR
While the NT signal is kept Low (true), it is detected that the engine is performing a copy operation, and the CPU keeps waiting for the / CTOP signal to come. If not in copy state / CPRNT
If / CTOP does not come while the value is kept low (true), a timeout error occurs after a certain period of time. In the case of the copy state, the timeout is canceled on the printer controller 2103 side so that the / CTOP signal is kept waiting forever. Set.

This time, the / PTOP signal transmitted from the engine control unit 2002 performs a copy operation.
The reader controller 901 uses the / PTOP signal. Also, as indicated by 1505, the / PTOP signal sent from the engine side is sent to the printer controller 2103.
Will be masked. The image signal actually generated by the reader controller 901 is only the image signal 1506. Then, after one interrupt copy is completed, the mask of the / PTOP signal is removed again and the signal is sent to the printer controller 2103 as / CTOP, so that the images 1503 and 1503 from the printer controller 2103 are output.
04 can be printed out to the engine control unit 2002.

As described above, the interrupt copy operation during the print operation can be realized.

Thus, the printer controller 210
The printer controller 901 determines which printer engine is to be acquired and when to issue a command in accordance with the status of the printer controller 901 and the status of the reader controller 901.
By performing determination and control according to the case, the requests from the two controllers 901 and 2103 can be realized for one engine.

[Control for Setting Content Confirmation Command] Next, control when the printer controller 2103 issues a setting content confirmation command will be described.

When the printer controller 2103 confirms the state set in the engine control unit 2002, the printer controller 2103 issues a setting confirmation command via / CCMD. The reader controller 901 having received it checks the setting value storage buffer of FIG.
If the contents to be confirmed in 03 are in the buffer, the contents are read out and notified to the printer controller 2103 through / CSTS.

If the content is not in the buffer, the reader controller 901 issues a setting content confirmation command to the / PC
Issued through MD. The engine control unit 2002 reads the content, and notifies the reader controller 901 of the setting content via / PSTS, and the reader controller 901 notifies the printer controller 2103 of the content via / CSTS.

[Control at Issue of Next State Transition Permit Command / Next State Transition Prohibit Command] A sequence flow after the main switch of the printer not shown in FIG. 23 is turned on is shown.
Printer engine main switch not shown ON
After that (S2700), pre-processing such as setting parameters required for printer control and adjusting the temperature to a temperature required for printing the fixing device is performed (S2701). When the fixing temperature required for printing is reached and preprocessing such as setting of various parameters necessary for control (S2702) is completed, the image data printing standby state is set (S270).
3).

When the printer enters the print start standby state, it waits for a print start signal (/ PRNT) from the reader controller 901. When the print start signal is transmitted from the reader controller 901 (S2704), printing is started and the printer enters the print state. Transition is made (S2705). End of printing (S2
706) Thereafter, the normal printer transitions to the post-processing state (S
2707). In the post-processing state, the printer may take a long time to perform elaborate cleaning processing of the drum and the transfer belt. When this post-processing is completed, the printer transitions to a print start standby state (S2708).

A case where the printer is controlled from the reader controller 901 so that the user does not enter the post-processing state for each original when copying a plurality of originals will be described below.

The user places the document on the platen and presses a print start key. When the print start key is pressed, the reader controller 901 causes the engine control unit 20 to operate as described above.
02 and document reading device 2 with / PRNT signal transmission
The image data read in step 2501 is transmitted, and the printer executes a series of printing sequences including a latent image, development, paper feeding, transfer, and arrangement. At a predetermined timing during printing, the reader controller 901 sends the next state. The transition prohibition command C1 is issued. FIG. 24 shows a sequence flow after the printer receives this command.

When the command is received (S2800), the state transition prohibition flag is set (S2801), and the engine control unit 2002 enters the normal post-processing timing (S28).
02), this flag is checked (S2803). If this flag is set, the printer engine is operated and transited to the printing standby state (S2804).

When the user enters the standby state during printing,
Replace it with the first document and press the switch again. When the reader controller 901 detects that the print start key has been pressed (S2806), the printer engine control unit 2
Issue a next state transition permission command to the 002 (S
2807). When the printer receives this command, the printer can start printing at a predetermined timing (S280).
At 8), the printer controller returns to the printing state (S2810), and the reader controller 901 transmits the next image data at the timing when the printer returns to the printing state, and the next printing is started.

When a settable time elapses in the printing standby state (S2805), the printer transits to the post-processing state and executes post-processing (S2809). If the next state transition prohibition command is not transmitted from the reader controller 901, the printer transitions to the post-processing state after printing, and executes the post-processing (S2809).

As described above, the next state transition permission command,
By using the next state transition prohibition command C2, in a printer that requires a longer time for the post-processing than the document replacement time,
Transition to post-processing, without waiting for post-processing to end,
The next image data printing can be executed. or,
The printer engine control unit 2002 controls the printer to transition to the post-processing state when a settable time elapses after the transition to the printing standby state.

[Temperature Control in Printing Operation, Standby During Printing, and Post-Processing State] Temperature control in transition from the printing operation to the post-processing state or the standby state during printing as described above will be described.

FIGS. 25 and 26 show the outline of the fixing unit in this embodiment.

25 and 26, reference numeral 2900 denotes an upper fixing roller, 2901 denotes a lower fixing roller, 2902 and 29
Reference numeral 03 denotes a lamp in the fixing rollers 2900 and 2901 which is used as a fixing heater, 2904 and 2905.
The thermistor 2906 for measuring the surface temperature of the fixing roller disposed in contact with the surfaces of the upper and lower fixing rollers 2900 and 2901 is used to move the lever upward when the sheet is ejected from the fixing device. A part of a sensor for detecting whether or not the discharge from the fixing device is completed;
Reference numeral 907 denotes a sheet to be conveyed.

The fixing unit includes two upper and lower fixing rollers 2.
900 and 2901 are configured to apply pressure at the contact points (not shown).
Fixing method by pressure between 00 and 2901 and fixing roller 2
900, 2901 Fixing heater 290
2, 2903 execute the fixing control by adopting two methods of heat fixing by heating the fixing rollers 2900, 2901.

A thermistor 2 for measuring the surface temperature of the fixing roller is provided on the surfaces of the fixing rollers 2900 and 2901.
Reference numerals 904 and 2905 are provided in contact with the upper and lower heaters 2902 and 2903, respectively. The fixing roller surface temperature obtained from both thermistors 2904 and 2905 was measured as the fixing temperature,
002, the current fixing temperature is determined from the obtained measurement data, and ON / OFF of the fixing heaters 2902 and 2903 is controlled. In the fixing temperature control according to the present embodiment, the engine control unit 2002 sets the temperature control target temperature, determines the current state from the fixing roller surface temperature obtained as described above, and holds the temperature control target temperature. ON the fixing heater
/ OFF.

In this embodiment, during the printing operation, the fixing temperature adjustment control is executed by setting the fixing temperature adjustment target temperature during the printing operation. The fixing temperature control target temperature during the printing operation is naturally set higher than the fixing temperature control target temperature in the standby mode in order to thermally fix the toner on the paper. During the printing operation, even when the fixing temperature control target temperature is set high, when the sheet is transported between the upper and lower fixing rollers 2900 and 2901, it is set by the heat absorption due to the fixing of the toner and the heat absorption of the sheet itself. Usually, the temperature of the fixing roller surface is lower than the target temperature. Therefore, during the printing operation, the fixing temperature in consideration of the thermal fixing of the toner is set as the temperature adjustment target temperature.

However, when the printer enters the printing standby state in this case, the paper is temporarily fixed by the fixing rollers 2900 and 2901.
If the fixing temperature adjustment control during the printing operation is executed when the time during which the sheet is not conveyed is long, the sheet is fixed to the fixing rollers 2900 and 29.
01, the fixing roller 290 which has been absorbed by heat fixing of toner or heat absorption by paper.
The heat of 0,2901 also has no escape area, and the temperature characteristic of the fixing roller surface heat causes the fixing roller surface temperature to suddenly rise slightly overshoot (FIG. 27).
For example, if the fixing temperature adjustment control during the printing operation is performed for a long time during the printing operation state, the temperature may enter a temperature range having an adverse effect as shown in FIG.

When the temperature of the surfaces of the fixing rollers 2900 and 2901 enters the temperature range where the adverse effects are caused, the next time a sheet comes, the sheet temperature of the fixing rollers 2900 and 2901 is high due to the offset phenomenon of the fixing device or the like. The toner loaded on the fixing rollers 2900 and 290
In this case, the toner adheres to the sheet 1 and the attached toner is further re-fixed to the paper, so that an optimum image cannot be obtained.

Therefore, when entering the standby state during printing,
The fixing temperature control dedicated to the standby state during printing is executed. The fixing temperature control target temperature of the fixing temperature control in the standby state during printing is set lower than the fixing temperature control target temperature of the fixing temperature control during printing operation in order to solve the problem due to the sudden rise in the temperature of the fixing roller surface. The temperature is set higher than the target temperature during standby in consideration of the printing of the next job, and by setting the temperature lower than during the printing operation, sudden It is possible to suppress the temperature rise to a range where there is no problem. In the present embodiment,
In consideration of the fixing property, the switching from the fixing temperature control during the printing operation to the fixing temperature control during the standby state during the printing is performed immediately before the sheet is discharged from the fixing device.
The timing at which the sheet is discharged from the fixing device is controlled such that the engine control unit 2002 executes the switching at the timing when the trailing end of the discharged sheet is detected by the fixing discharge sensor 2906 shown in FIG.

Since the target temperature in the standby state during printing is set higher than the target temperature in the standby state,
It is necessary to lower the temperature of the surface of the fixing roller by switching to the temperature control during standby in the post-processing state before the standby. Therefore, when transitioning to the post-processing state without starting the next job from the printing standby state, control is performed to execute switching of the fixing temperature control.

FIG. 2 is a control flow showing the above control in a simplified manner.
FIG.

[0143]

As is apparent from the above description, according to the present invention, the conventional problem is solved by inserting the reader controller between the engine controller and the printer controller, and the reader can be replaced without changing the printer controller. It is possible to realize a copy function which is not limited by the processing speed of the host computer.

Further, according to the present invention, even after entering the standby state during printing, the fixing temperature adjustment control dedicated to the standby state during printing is executed, thereby suppressing a sudden temperature rise due to the overshoot characteristic to a range without any problem. This makes it possible to always obtain an optimum image without adversely affecting the image formation of the next job.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a controller and a printer.

FIG. 2 is a connection diagram between a printer controller and an engine control unit.

FIG. 3 is a list of video I / F signals.

FIG. 4 is a diagram illustrating a paper transport path in the printing apparatus according to the present invention.

FIG. 5 is an image signal timing chart.

FIG. 6 is a serial signal timing chart.

FIG. 7 is a diagram illustrating serial communication during a printing operation.

FIG. 8 is a cross-sectional view of the printing apparatus according to the present invention in a state where a reader unit is mounted.

FIG. 9 is a connection diagram in a configuration in which a reader controller is inserted between a printer controller and an engine control unit.

FIG. 10 is a flowchart showing a communication sequence.

FIG. 11 is a flowchart showing a communication sequence.

FIG. 12 is a flowchart showing a processing procedure of a state change in / CCRT when a reader is attached.

FIG. 13 is a flowchart illustrating a print request processing procedure during a copy operation.

FIG. 14 is a flowchart illustrating a processing procedure of a copy request during a printing operation.

FIG. 15 is a timing chart at the time of interrupt copying.

FIG. 16 is a sectional view of the printer.

FIG. 17 is a system connection diagram of the printer.

FIG. 18 is a block diagram showing a detailed configuration inside a reader controller.

FIG. 19 is a block diagram showing a detailed configuration inside a reader controller.

FIG. 20 is a diagram showing a timing difference between copying and printing.

FIG. 21 is a system connection diagram of a conventional reader.

FIG. 22 is a system connection diagram of a conventional reader.

FIG. 23 is a flowchart illustrating a print operation sequence flow of the printer.

FIG. 24 is a flowchart illustrating an operation sequence flow of the printer when a next state transition prohibition command is received.

FIG. 25 is a perspective view of a fixing unit.

FIG. 26 is a sectional view of a fixing unit.

FIG. 27 is a diagram showing overshoot characteristics of a fixing roller surface temperature.

FIG. 28 is a flowchart illustrating a switching procedure of fixing temperature control.

[Explanation of symbols]

 101 reader frame 106 reader controller 1301 set value buffer 2001 printer main body 2002 engine control unit 2103 printer controller 2104 host computer 2201 selector 2207 gate 2208 control circuit 2501 image reading device

Claims (5)

[Claims] 1. An engine control unit for controlling recording paper conveyance and image forming control of a printer, and for setting and operating the engine control unit and for controlling an image transmitted from an external computer or the like. A printer controller for transmitting an image at a timing desired by the unit, a document reading device, control of the document reading device, processing of image data output from the document reading device, and image transmission at a timing desired by the engine control unit. In a printing device having a reader controller for performing the following operations, the reader controller is inserted between the engine control unit and the printer controller. The state of the engine is changed to the current state of printing. When the next state transition prohibition command is issued from the reader controller at the timing of, the printer controller does not transition to the post-processing state or the next print state after the current printing is completed, and the reader controller does not operate with the printer engine running. Wait for the next state transition permission command.Transit to the standby state during printing and make it stand by. During this time, execute the fixing temperature adjustment control dedicated to the printing standby state that is different from the fixing temperature adjustment control during printing operation, and after the transition to the printing standby state. When the next state transition permission command is issued at a predetermined timing from the reader controller, the engine is returned to the printing state at a predetermined timing at which printing is possible, the fixing temperature control during the printing operation is executed again, and transmitted from the reader controller. A printing device for printing the following print image data. 2. The printing apparatus according to claim 1, wherein a timing of switching from the fixing temperature control during the printing operation to the fixing temperature control during a standby state during printing is switched immediately before the paper is discharged. . 3. The printer engine changes to a post-processing state if a next-state transition permission command is not issued until a predetermined settable time elapses after the printer engine changes to a printing-standby state, and in the post-processing state, a fixation is performed. 2. The printing apparatus according to claim 1, wherein the temperature control is performed not in the fixing temperature control during the printing operation but in the normal standby mode, which is not the fixing temperature control in the printing standby state. 4. The printing apparatus according to claim 1, wherein each of the fixing temperature adjustment controls sets a predetermined temperature adjustment target temperature and performs control so as to maintain the target temperature. 5. A temperature adjustment target temperature of the fixing temperature adjustment control in the standby state during printing is lower than a temperature adjustment target temperature of the fixing temperature adjustment control during the printing operation, and a temperature of the fixing temperature adjustment control in the standby state. 2. The printing apparatus according to claim 1, wherein the temperature is set to be higher than the adjustment target temperature.