JPH09139789A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operating efficiency of a printer section in the digital image forming device. SOLUTION: A digital copying machine 1 is provided with a scanner section 2 reading an image of an original and a printer section 3 recording copy data read by the scanner section 2 onto a sheet and is connected to plural external devices A to C such as personal computers via a communication line 48. When external data are transferred from any of the external devices A to C during the execution of recording based on copy data for recording an original image, the digital copying machine 1 allows the printer section 3 to execute the recording of the external data for a pause period in the recording operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for recording data obtained by reading an image of a document on a sheet, and particularly for recording digitized data, the image forming apparatus originally has it. The present invention relates to an image forming apparatus capable of recording an image of read data by using an image forming unit, particularly a printer unit, and recording external data transferred from an external apparatus as necessary.

[0002]

2. Description of the Related Art A digital copying machine, which is a kind of image forming apparatus according to the present invention, reads an image of a document and records the read data as copy data on a sheet.
In addition to the modes, it has recently been commercialized as a multifunction machine to which functions such as a print mode and a FAX mode are added.

Therefore, in addition to the case of operating as a copying machine, recording of image data by fax communication and recording of external data from another external device such as a host computer, personal computer, or word processor. This makes it possible to increase the operating rate of the printer unit that is the image forming unit. That is, the operating rate of only the printer unit is higher than that of a copying machine having only a function of reading an image of a document and recording the image on a sheet.

The above-mentioned digital copying machine includes a scanner section for reading an image of a document, a printer section for storing image-processed copy data into data capable of recording the data read by the scanner section, and recording the copy data. And
It is provided with an input / output interface unit for processing external data from the above-mentioned external device, for example, a word processor or a personal computer. As a result, in addition to recording the data obtained by reading the image of the document, the external data from the external device is received and the external data is received during the standby of the printer unit except during the series of recording operation of the copied data by the printer unit. Can be recorded.

Conventionally, the above-mentioned digital copying machine uses a printer unit for reading an image of a document and recording the image, and records external data required by another external device. The one disclosed in Japanese Patent Laid-Open No. 5-130311 is proposed. This is to record image data transferred from an external device when the printer unit is not operating in order to increase the operating rate of the printer unit.

Briefly explaining the contents described in the above publication, the printing section of the digital copying machine 1000 connected through a communication line 1014 is shared as shown in FIG. Function 1006 and laser beam printer unit 1007
When the CPU 1010 inputs a print request from each of the functional units, the operating state of the printer unit of the copying machine 1000 is checked, and if the printer unit is usable, that is, the printer unit is not operating, the requested functional unit Image data is transferred to the copying machine 1000 through the output selector 1009 and the selector 1002, and image recording is performed. Therefore, as the image data to each of the functional units, the image data from the facsimile apparatus or the personal computer is input through the external interface 1011 as the input selector 1008.
The data is sent to the facsimile function 1006 and the laser beam printer unit 1007 described above via the printer. Therefore, when the CPU 1010 receives a print request, the facsimile function unit 1006 or the laser beam printer unit 10
As described above, the contents of 07 are transferred to the printer section of the copying machine 1000 to perform recording.

[0007]

According to the above configuration,
This has the effect of increasing the operating rate of the printer section of the digital copying machine 1000. In other words, if there is a print request for image data from another external device while the printer unit is not operating, the printer unit can be operated, and the digital copying machine can be effectively used.

However, the image (external) data requested to be printed by the external device can be recorded only when it is confirmed that the operation of the printer section, which is the image forming apparatus, is in a standby state. Even if the printer unit does not perform the recording operation in any way, the recording operation cannot be performed during the preparation, and the image data from the external device is recorded after waiting for the completion of the recording operation.
The operating rate of the printer unit cannot be increased. At the same time, the time for recording and outputting the external data of the external device is delayed.

That is, in the conventional recording of external data from an external device, a series of copying operations of the printer section are executed, and at the end of this, the printer section is kept in a standby state, and further printer sections are maintained. Could not be calculated.

Therefore, according to Japanese Patent Laid-Open No. 5-130311, the priority of external data transferred from an external device is determined in advance. Is
It is specified that the recording of the external data is started by confirming the state before the recording operation in the printer unit is started.

In view of the above points, since the external data forcibly transferred from the facsimile is recorded while the printer unit is operating, the image formation in the printer unit is continued and the next image formation is performed. Since it is interrupted before it is started, the startup of the printer unit becomes a problem, the operating rate cannot be improved as expected, and the image recording is not efficient. That is, since the continuous operation of the printer unit is forcibly suspended, it is more efficient to continue the operation of the printer unit as it is, and the operating rate is not improved so much.

An object of the present invention is to provide an image forming apparatus having a printer unit capable of reading an image of a document and recording the image on a sheet, which can further improve the operating rate (operating efficiency) of the printer unit. To provide.

In particular, an object of the present invention is to set a timing when the image forming means, that is, the printer unit is in continuous operation, at which the continuous operation cannot be performed by the printer unit without recording the image data from the external device. This is to detect and start the recording operation of the external data of the external device at this timing to improve the operating efficiency of the printer section.

[0014]

An image forming apparatus for achieving the above-mentioned object of the present invention includes a scanner section for reading an image of an original document and data read by the scanner section as copy data on a sheet. An image forming apparatus capable of recording external data transferred from an external device on a sheet as needed through the printer unit, and an image of an original document by the scanner unit. Is read and the read data is recorded on the sheet as copy data.
When the external data is transferred from the external device, the printer unit detects a pause period during which the recording operation cannot be continuously executed, and at the time of the detection, the recording operation of the copy data is temporarily suspended, It is characterized in that a data recording operation is executed.

Here, the pause period during which the printer unit cannot continuously execute the recording operation during the series of recording operation of the copy data means the time when the original is read to read the image of the original. During the image reading and image processing of the original, it is either a trouble of the scanner unit or a trouble of the original conveying device that conveys the original to the reading position, and it is impossible to forcibly stop the recording operation in the printer. Absent. In addition, since the recording operation of the printer unit is temporarily stopped during the above-described pause period in which the copy data recording (copy mode) operation cannot be continued, it is possible to record external data from an external device using this period. Of course, the operating rate of the printer section can be greatly improved.

Further, when external data is transferred from a plurality of external devices, the external data that can be processed by the image forming apparatus main body is given priority among the external data, and the copy data recording operation is continued. By executing the recording operation of the external data at the pause time when it cannot be executed, another recording operation can be executed without interrupting the operation of the printer unit. For example, if the sheet size that can be processed by the image forming apparatus matches the sheet size designated by the external data, the recording operation can be performed on the sheet of the same size without interrupting the operation of the printer unit. . Therefore, there is an effect of increasing the operating rate of the printer unit.

Further, when the printer section is continuously recording the copy data, it is detected that it is a rest period in which the recording operation of the copy data cannot be executed, provided that the sheets for the recording are exhausted. However, when the external data recording operation is executed at the time of the detection, if it is confirmed that the external data is recorded on another sheet different from the above-mentioned lost sheet, the external data can be recorded as in the case described above. Similarly, without interrupting the operation of the printer unit,
The recording operation can be executed. In this case, particularly during the rest period when the sheets to be fed in the printer unit are exhausted, the recording operation of the copy data cannot be executed until the sheets are replenished, and the operation rate of the printer unit can be improved. Higher.

Further, the external data recording operation is temporarily performed by returning to the copy data recording operation mode at the time when all of the external data is completed or when the recording operation by the copied data is ready to be executed. When recording the copy data that has been temporarily interrupted, the operation stop period in which the recording operation of the printer unit cannot be performed can be shortened, and the printer unit can be operated substantially continuously.

On the other hand, another image forming apparatus for achieving the object of the present invention comprises a scanner unit for reading an image of an original document, and a printer unit for recording the data read by the scanner unit as copy data on a sheet. In an image forming apparatus capable of recording external data transferred from an external device on a sheet as needed via the printer unit, the external data transferred from the external device to the printer unit. When the expansion into the data that can be recorded is completed, the external data recording in the printer section is preferentially executed, and when the external data recording is completed, the mode is switched to the recording of the copy data. And are characterized.

During the period in which the printer unit records the external data, the scanner unit reads the image of the original document and the read data is image-processed to obtain copy data. By executing it, when the recording of the copied data and the recording of the external data from the external device are parallel, the data recording on the external device side is given priority,
By reading the image and performing image processing during this period,
The recording operation of the copied data can be continued and executed immediately after the recording of the external data is completed. Therefore, it is possible to eliminate the idle period of the printer unit and further improve the operation efficiency. In particular, the external data from the external device does not need to read an image like copy data, so that the processing is fast and the external data can be prioritized to improve the operation rate.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An image of an original according to the present invention is read, copy data which can be recorded by a printer unit is subjected to image processing, the copy data is recorded on a sheet, and external data from an external device is recorded. An image forming apparatus for recording as needed will be described with reference to the drawings.

The present invention will be described by taking a digital copying machine having a copying mode, a printing mode, a fax mode, etc. as an example. In FIG. 1, the digital copying machine according to the present invention and an external device are connected via a communication line. FIG. 2 is a system diagram showing a state, and FIG. 2 is a sectional view showing an internal structure of the digital copying machine in FIG.

First, referring to FIG. 2, a digital copying machine which is a digital image forming apparatus will be described. The main body 1 of this digital copying machine is roughly divided into a scanner section 2, a laser recording section 3, that is, a printer section.

The scanner unit 2 is a document placing table 2-0 made of transparent glass, and a double-sided automatic document feeder (ADF) 2 for automatically feeding and feeding a document onto the document placing table 2-0.
-1, and an original image reading unit for scanning and reading an image of an original placed on the original placing table 2-0,
That is, it is composed of the scanner unit 2-2.

The image (read) data of the original read by the scanner unit 2 is sent to an image data input unit, which will be described later, as copy data that can be recorded by the printer unit 3, and a predetermined amount of image data is read. Image processing is performed.

The ADF 2-1 sets a plurality of originals at a time on an original tray (not shown) provided, and automatically sets the originals one by one automatically on the original table of the scanner unit 2-2. 2-0 It is a device that feeds up. Further, the ADF 2-1 is configured to cause the scanner unit 2-2 to read one side or both sides of a document in accordance with an operator's selection, a transport path for a single-sided document, a transport path for a double-sided document, and a transport path switching unit. Etc. Since many applications and commercializations have been made for this ADF2-1, no further explanation will be given.

A scanner unit 2-2 forming a candy scanner unit 2 for reading an image of an original on the original table 2-0.
Is a lamp reflector assembly 2 that exposes the original surface.
-3 and a photoelectric conversion device (CCD)
A first scanning unit 2-6a equipped with a first reflecting mirror 2-5a that reflects the reflected light from the document to guide it to 2-4, and the reflected light from the first reflecting mirror 2-5a. Second for guiding the image to the photoelectric conversion element (CCD) 2-4
Second mounted with third reflecting mirrors 2-5b and 2-5c
Of the scanning unit 2-6b, and a device (CCD) 2-4 for converting a reflected light image from the original document into an electric image signal via the above-mentioned reflection mirrors 2-5a, 2-5b, 2-5c. It is composed of an optical lens body 2-7 for forming an image and the above-mentioned CCD element 2-4 for converting a reflected light image from a document into an electric image signal.

The scanner section 2 sequentially places the originals to be read on the original placing table 2-0 by the related operations of the RADF 2-1 and the scanner unit 2-2.
A scanner unit 2 is provided along the lower surface of the document table 2-0.
2 is moved to read the original image. In particular, the first scanning unit 2-6a includes the document table 2
By traveling at a constant speed V from left to right along −0, the second traveling unit 2-6b moves to V at that speed V.
Driving is controlled in parallel in the same direction at a speed of / 2. As a result, the placed originals are sequentially transferred to the CCD elements 2 line by line.
The image is read by forming an image on -4.

The image data obtained by reading the original image with the scanner unit 2-2 is sent to an image processing unit, which will be described later, and subjected to various processing, and then the printer unit 3 stores it in the memory of the image processing unit. The data is temporarily stored as recordable copy data, and the copy data in the memory is given to the laser printer unit 3 in accordance with an output instruction to record an image on a sheet.

The (laser) printer section 3 is provided with a sheet conveying system which is a sheet for forming an image, a laser writing unit 30, and an electrophotographic process section 31 for forming an image.

The laser writing unit 30 emits laser light in accordance with copy data read from the memory after being read by the scanner unit 22 or external data transferred from an external device, a laser. A polygon mirror that deflects light at a constant angular velocity, and a laser beam that is deflected at a constant angular velocity are corrected so as to be deflected at a constant velocity on a photosensitive drum that constitutes the electrophotographic process section 32.
It has a θ lens and the like.

The electrophotographic process section 31 includes a charging device, a developing device, a transfer device, and a well-known photosensitive drum 32 around the photosensitive drum 32.
Equipped with a peeler, a cleaner and a static eliminator.

On the other hand, the sheet conveying system conveys the sheet P to the electrophotographic process section 31 for performing the above-mentioned image formation, particularly to the transfer position where the transfer device is arranged, and the sheet to the conveying section 33. A cassette sheet feeding device 34a, 34b for feeding P or a manual sheet feeding device 35 for appropriately feeding a sheet of a required size, an image formed on the sheet P after transfer, especially for fixing a toner image. Fixer 3
6. An image is formed again on the back surface of the sheet P after fixing, that is, a switchback conveyance path 37 for reversing the sheet P to form an image on both sides of the sheet P, and a sheet P passing through the conveyance path 37 are accommodated. And an intermediate tray 38.

Further, on the downstream side of the fixing device 36, a switching claw 39 for switching the sheet P to the above-mentioned switchback conveyance path 37 is provided, and the sheet P on which the image formation is completed is next passed through the discharging section 4. And the path for conveying the sheet to the sheet post-processing apparatus 5 is switched.

Sheets of a predetermined size desired by the operator (operator) are accommodated in the cassette sheet feeders 34a and 34b of the sheet conveying system, and the manual sheet feeder 35 is desired by the operator. It is used for multi-sheet feeding of a small number of sheets. Therefore,
The operator selects the size of the paper in the paper feed cassette or the manual paper feed device 35 to feed the desired size of sheet.

In the laser writing unit 30 and the electrophotographic process section 31, the bit data stored in the state where the copy data or the external data read from the image memory is expanded into the data which can be recorded by the printer section 3,
By scanning the laser beam with the laser writing unit 30, an electrostatic latent image is formed on the surface of the photoconductor drum 32, and is visualized with toner. As the toner image formed on the surface of the photoconductor drum 32, the sheet P of the size selected by the above-described paper feeding device 34 or the manual paper feeding device 35 is sent to the transfer device via the transport unit 33. . As a result, the toner image on the surface of the photoconductor drum 32 is transferred to the surface of the sheet P, is sent to the fixing device 36, and after the fixing is completed, the image formation is completed and the sheet discharging process is performed via the discharging unit 4. It is transported to the device 5.

(Circuit Description of Image Processing Section) Next, the configuration and function of the image processing section in the digital copying machine 1 for performing image processing on the read original image information will be described.

FIG. 3 is a block diagram of an image processing unit included in the digital copying machine 1 of FIG. An image processing unit included in the digital copying machine 1 includes an image data input unit 4
0, image processing unit 41, image data output unit 42, RAM
(Random access memory), a memory 43 including a hard disk, and a central processing unit (CPU) 44.

The image data input section 40 is a CCD section 40a,
It includes a histogram processing unit 40b and an error diffusion processing unit 40c. The image data input unit 40 binarizes and converts the image data of the document read from the CCD 2-4, processes the image data by the error diffusion method while taking a histogram as a binary digital amount, and stores it in the memory 43. It is configured to be stored once.

That is, in the CCD section 40a, after the analog electric signal corresponding to each pixel density of the image data is A / D converted, MTF correction, black-and-white correction or gamma correction is performed, and 256 gradations (8 bits). Is output to the histogram processing section 40b.

In the histogram processing section 40b, the digital signal output from the CCD section 40a is added for each pixel density of 256 gradations to obtain density information (histogram data), and if necessary, the obtained histogram data is It is sent to the CPU 44, and also sent to the error diffusion processing unit 40c as pixel data.

In the error diffusion processing section 40c, the error diffusion method which is a kind of pseudo intermediate processing, that is, the method of reflecting the binarization error in the binarization judgment of the adjacent pixel, is output from the CCD section 40a. A bit / pixel digital signal is converted into 1 bit (binarization), and a redistribution operation for faithfully reproducing the local area density in the original is performed.

The image processing unit 41 includes multi-valued processing units 41a and 41b, a combination processing unit 41c, a density conversion processing unit 41d, a scaling processing unit 41e, an image processing unit 41f, an error diffusion processing unit 41g and a compression processing unit 41h. Contains.

The image processing section 41 is a processing section for finally converting the input image data into image data desired by the operator, and is stored in the memory 43 as copy data of the finally converted output image. Until that time, the processing unit is configured to process. However, the image processing unit 4
Each of the above-mentioned processing units included in 1 functions as necessary and may not function. That is, in the multi-value quantization processing units 41a and 41b, the error diffusion processing unit 40c outputs 2
The binarized data is converted into 256 gradations again.

In the synthesizing section 41c, a logical operation for each pixel, that is, an operation of logical sum, logical product or exclusive logical sum is selectively performed. The data to be subjected to this calculation is the pixel data stored in the memory 43 and the bit data from the pattern generator (PG).

In the density conversion processing section 41d, the relationship between the input density and the output density is arbitrarily set for the 256 gradation data signal based on a predetermined gradation conversion table. In the scaling processing unit 41e, pixel data (density value) for the target pixel after scaling is obtained by performing interpolation processing based on the input known data according to the instructed scaling ratio, and the sub-scanning is varied. After being multiplied, the main scanning is subjected to a scaling process. In the pixel processing unit 41f, various image processing may be performed on the input pixel data, and information collection such as feature extraction may be performed on the data string. The error diffusion processing unit 41g performs the same processing as the error diffusion processing unit 40c of the image data input unit 40. Compression processing unit 41h
Then, binary data is compressed by the encoding called run length. Regarding the compression of image data, the compression functions in the final processing loop when the final output image data is completed.

The image data output unit 42 is also a restoration unit 42.
a, a multi-value quantization processing unit 42b, an error diffusion processing unit 42c, and a laser output unit 42d. Image data output unit 4
In No. 2, the image data stored in the memory 43 in the compressed state is restored, converted to the original 256 gradations again, and the error diffusion of the four-valued data that is a smoother halftone expression than the binary data is performed. It is configured to transfer data to the laser output unit 42d.

That is, in the decompression unit 42a, the compression processing unit 41
h, the compressed image data is restored. In the multi-value quantization processing unit 42b, the multi-value quantization processing unit 41 of the image processing unit 41 is used.
Processing similar to that of a and 41b is performed. In the error diffusion processing unit 42c, the error diffusion processing unit 4 of the image data input unit 40
The same processing as in 0c is performed. In the laser output section 42d, the digital pixel data is turned on / off of the laser based on a control signal from a sequence control (not shown).
The signal is converted into an off signal, the semiconductor laser in the laser writing unit 30 is turned on / off, and the electrostatic latent image is written on the photosensitive drum 32.

The data handled by the image data input section 40 and the image data output section 42 is basically stored in the memory 43 in the form of binary data in order to reduce the capacity of the memory 43. It is also possible to process in the form of four-valued data in consideration of deterioration of image data.

(Explanation of control structure of the entire digital copying machine)
FIG. 4 is a diagram showing a state in which the operation of each unit of the entire apparatus of the digital copying machine 1 is managed by a central control unit (CPU) 44. CCD 2-4, image data input section 40,
The image processing unit 41, the image data output unit 42, the image memory 43, and the central processing unit (CPU) 44 are the same as those in FIG.

The central processing unit (CPU) 44 manages each drive mechanism section constituting the digital copying machine 1 such as the ADF 2-1, the scanner section 2 and the laser printer section 3 described in FIG. Control signals are output to each part.

Further, an operation board unit 45 composed of an operation panel is connected to the central processing unit 44 in a mutually communicable state, and a control signal is sent to the central processing unit 44 in accordance with the copy mode set and input by the operator. The data is transferred and the operation of the digital copying machine 1 is controlled according to various setting modes.

Further, a control signal indicating the operation state of the digital copying machine is transferred from the central processing unit 44 to the operation board unit 45, and the operation board unit 45 side uses this control signal to determine the current state of the apparatus. Whether or not there is an operation state is displayed on the display unit or the like as shown to the operator.

Reference numeral 46 denotes a sorter control unit, which is a control unit for managing the operation of the post-processing device for sorting the copies output by the digital copying machine 1. An image data communication unit 47 is provided to enable information communication with other digital image devices such as image information and image control signals. That is, the external device according to the present invention, particularly the external devices A to C such as a personal computer and a word processor as shown in FIG. 1, are connected to the main body of the digital copying machine 1 via the communication line 48, and via the communication unit 47. Capture data. When connected to a facsimile device, the communication unit 47 has a modem and is connected to the other party via a telephone line.

The CPU 44 described above is a communication unit 47.
External data from the external devices A to B input via the image data is stored in the image data storage unit 43 or the hard disk, and the data to be image-formed by the printer unit 3 is input via the image processing unit 41 described above. The data that is expanded and operated so that the printer unit 3 is operated to be recorded is stored again in the storage unit 43. In the present invention, recording of the stored data is started during a period in which the continuous recording operation of the printer unit 3 is temporarily stopped, which will be described later in detail.

Further, the CPU 44 outputs control signals for driving various loads 49 of the printer unit 3 to start the recording operation, and various loads 50 of the scanner unit 2 to read the image of the original. And a control signal for driving various loads 51 for driving the ADF 2-1 are output. Here, when the printer unit 3 is driven, the CPU 44 inputs a signal indicating the rotational position of the photoconductor (not shown) and a detection signal for detecting the conveyance state of the fed sheet, so that the printer unit 3 is driven. Grasping the operation status of the
Detects printer problems such as poor rotation of the photoconductor.

Moreover, in the scanner section 2, scanning is started according to the detection status of the home position sensor of the support 2-6a, and a signal from the home position sensor indicating this state and a sensor for detecting the end of scanning are sent. When the CPU 44 inputs a signal, the operation status of the scanner unit is grasped and it is determined whether it is normal or not. In particular, it is a fixed time from the start of scanning to the end of scanning, and if it is later than that time, it can be easily detected that there is a trouble in the scanner unit.

Further, in the ADF 2-1 as well, signals such as signals from various sensors for detecting a jam of the document in the transport system such as transporting the document to the image reading position and discharging the document that has been read are input to the CPU 44. And ADF2
To easily understand a trouble on the -1 side, such as a document conveyance jam. Particularly, in the CPU 44, before the image recording is started, especially when the power is turned on, the ADF 2
-1, The operation of the printer unit and the scanner unit is normally grasped by self-diagnosis. This is because the self-diagnosis can be easily performed by inputting the signals from the various sensors described above, which is well known in the art, and the details thereof will be omitted.

As described above, the CPU 44 grasps the operation status of the printer unit 3 each time and at the same time, the ADF
It is possible to completely grasp the status of the operations of 2-1 and the scanner unit 2 and their trouble states. Especially CP
U44 is for controlling the image recording by the digital copying machine 1 as described above, and it is well known that the above-mentioned controls and the trouble state and the like are sequentially detected, and the details thereof are omitted. .

FIG. 5 is a plan view showing a specific example of the operation panel of the operation board unit 45 described above in the digital copying machine 1. In the central part of this operation panel,
A touch panel liquid crystal display device 6 is arranged, and various mode setting key groups are arranged around it.

On the screen of the touch panel liquid crystal display device 6, there is a screen switching instruction area for constantly switching to a screen for selecting an image editing function, and when this area is directly pressed with a finger, various image editing functions are selected. A list of various editing functions is displayed on the LCD screen so that you can do it. From among the displayed various editing functions, the operator sets the editing function by touching the area where the desired function is displayed with a finger.

The dial 7 for adjusting the brightness of the screen of the liquid crystal display device 6 will be briefly described with reference to the reference numerals attached to the various setting key groups arranged on the operation panel.

Further, 8 is a magnification automatic setting key for setting a mode for automatically selecting the magnification, 9 is a zoom key for setting the copying magnification in 1% steps, and 10 and 11 read out and select a fixed magnification. Is a fixed magnification key, and reference numeral 12 is an equal magnification key for returning the copy magnification to the standard magnification (actual magnification).

Reference numeral 13 is a density switching key for switching the copy density adjustment from automatic to manual or to the photo mode, 14 is a density adjustment key for finely setting the density level in the manual mode or the photo mode, and 15 is a copy. A tray selection key for selecting a desired paper size from the paper sizes set in the paper feed unit of the machine.

Reference numeral 16 is a number setting key for setting the number of copies, 17 is a clear key which is operated when clearing the number of copies or stopping the continuous copying on the way, and 18 is a start key for instructing the start of copying. Reference numeral 19 is an all release key for releasing all of the currently set modes to return to the standard state, 20 is an interrupt key which is operated when it is desired to copy another document during continuous copying, and 21 is a copy machine. Operation guide key for displaying a message on the operation method of the copying machine by operating when you do not know the operation,
Reference numeral 22 is a message sequential key for displaying the continuation of the message displayed by operating the operation guide key 21.

Reference numeral 23 is a double-sided mode setting key for setting the double-sided copy mode, and reference numeral 24 is a discharge processing mode setting for setting the operation mode of the sheet discharge processing device 5 for sorting the copies discharged from the copying machine. Is the key.

Reference numerals 25 to 27 are setting keys relating to the printer mode and the facsimile mode. Reference numeral 25 is a memory transmission mode key for temporarily storing a transmission original and then transmitting it. Reference numeral 26 is a digital copying machine mode for copying, faxing and printer. A copy / fax / printer mode switching key for switching between the two, and a one-touch dial key 27 for storing a destination telephone number in advance and making a call to the destination by one-touch operation during transmission.

FIG. 1 shows a digital image forming apparatus according to the present invention.
In particular, it is a system diagram showing a state in which the digital copying machine 1 is connected to an external device via a communication line 48. First,
A system configuration of various information devices in the office where the digital copying machine 1 is installed will be described.

The external devices A to C, which are information devices existing in the office, are personal computers, word processors, etc., as shown in the figure, and are connected to the digital copying machine 1 via the communication line 48. When necessary, for example, when image (external) data to be recorded is transferred and a recording command is sent from the external devices A to C, the operation of the printer unit 3 is temporarily suspended on the digital copying machine 1 side. By confirming that, the recording operation is started. These information devices are connected to the digital copying machine 1 by a general-purpose interface (I / F) such as SCSI, and data can be exchanged. The content of the data is image (external) data for recording including a control command, density data of a recording image, a size of a recording sheet, and the like.

In FIG. 1, personal computers of external devices A to C, which are a plurality of information devices, are connected to one digital copying machine 1.
By sending a recording command from C to C, the digital copying machine 1 records the transferred external data from the external device. On the digital copying machine 1 side, the ADF
The image of the original sent by 2-1 or the like is read, the read data thus read is processed as copy data, and is normally recorded with priority. Then, when the operation of the printer unit of the digital copying machine 1 cannot be continued and is temporarily stopped, recording of the external data transferred from the external device is started based on the recording command from the external device.

(Print Mode and Copy Mode) The digital copying machine 1 is normally set to the copy mode state, and in response to the operation of the print start switch, the ADF 2
When a document is set at -1 or the like, the document is conveyed to the reading position and then the image is read, and the read data is printed by the printing unit 3 in the image processing apparatus as described with reference to FIG. Image processing is performed so that the image can be recorded, and the image data subjected to the image processing is stored in the storage unit 43 as copy data. When the preparation for recording in the print unit 3 is completed, the copy data stored in the storage unit 43 is sequentially read out, and the laser of the laser writing unit 30 is driven and controlled according to the processing of the image data output unit 42. Then, the photoconductor 32 is irradiated with this.

During execution of the recording operation in this normal copying mode, if external data is transferred from the external devices A to C and a recording request command is issued, the digital copying machine 1 side receives the transferred external data. Data is stored, and this recording operation is temporarily suspended. That is, on the digital copying machine 1 side, the recording operation in this copying mode is prioritized during the recording operation for recording the image of the document read as described above on the sheet. Then, the operation of the printer unit 3 is not continued, and the external data from the above-described external device is recorded in accordance with the recording command during the temporary suspension period. Therefore, in the printer unit 3, even during recording in the copy mode, the operation is not continued, and the CPU 44 grasps the state in a state where the operation is suspended, that is, the state is detected. Therefore, the recording of the transferred external data is started.

In this case, the external data transferred from the external device is developed into data that can be recorded in the printer unit 3 by the digital copying machine 1, and is stored in the storage unit 43. Will be completed. When this preparatory state is completed, the CPU 44 detects, via the image data output unit 42, the external data stored in the storage unit 43 via the image data output unit 42, provided that the CPU 4 has detected that the printer unit 3 is not operating. Then, each load of the printer unit 3 is controlled in order to start the recording operation. As a result, the recording operation of the external data from the external device A or C is started.

When the digital copying machine 1 is ready to read the image of the original and record the copied data obtained by processing the read data, the CPU 44 detects this state, and the image from the external device is thereby detected. The recording by the data is temporarily stopped and the recording by the copied data is started. Alternatively, after waiting for the recording of the transferred external data of one of the external devices A to C to be completed, the above-described copy data recording operation is restarted and executed.

Now, the temporary suspension of the printer unit 3 according to the present invention will be described in detail. During the pause (pause period), for example, the document is conveyed by the ADF 2-1 to a position where the scanner unit 2 reads an image, the scanner unit 2 reads the image after the conveyance, and the read data is read. This is an image processing period until the image-processed copy data is recorded in the storage unit 43. During this period, the printer unit 3 does not perform a recording operation and is in a pause. Therefore, it is a period from the time when the recording of the copy data by the previous document is completed to the time when the reading operation of the next document is performed and the processing is completed by using the read data as the copy data.

That is, from the time when the copying of the previous document is completed and the conveyance of the next document to the reading position is started to the completion of the image processing of the read data as described above,
The printer unit 3 suspends the recording operation and enters a dormant state.

This period can be easily detected by the CPU 44. That is, when the recording of the copy data by the previous document is completed, the ADF2-
A command signal is output to the load 51 of the ADF in order to start the conveyance of the document by 1. From the output of this command signal, the read data is subjected to image processing as copy data, and then a signal for instructing the start of recording is output to the printer unit 3. Therefore, the period up to this point can be detected as a pause period of the printer 3. .

Therefore, the CPU 44 detects, in particular, the start time of the stop during which it is detected that it is the stop period, and from this time, the external data is transferred from any of the external devices A to C and stored. If so, the recording of the external data is started. If all the external data of the external device is recorded during the pause period of the printer unit 3, recording of the copy data in the copy mode is started after the completion of the pause period. However, the rest period is very short. That is, this is a period from the time when the original is conveyed, the time when it is read, and the time when image processing is performed. If the external data covers a plurality of pages during this period, all the external data cannot be recorded.
In this case, it is preferable to record the remaining external data in the next rest period. Alternatively, the recording of the copied data may be continued while giving priority to the recording of the external data, and the recording of the copied data may be started at the time when all the recording of the external data is completed.

On the other hand, as the rest period of the printer unit 3,
The paper feeding period is not limited to the above. For example, AD
An image reading process cannot be performed due to a document transportation trouble in F2-1, that is, a jam that makes the document transportation impossible. Therefore, the user removes the transport trouble in the ADF 2-1, for example, the jammed document and cancels the trouble. In this case, if the read of the jammed document is completed, the printer unit 3 can continue the recording operation based on the copy data of this document, but the copy data of the next document does not exist, and therefore, the recording is performed. The operation cannot be continued. However, the printer unit 3 can operate independently if there is data to be recorded,
The recording operation can be executed. Therefore, as described above, ADF
If the trouble state in 2-1 is detected by the CPU 44,
The CPU 44 can detect that it is a pause period when the continuous recording operation of the printer unit 3 is completed.

The rest period is also the same for troubles in the scanner section 2. The trouble of the scanner unit 2 is that normal image reading cannot be performed due to insufficient light quantity. In other words, by detecting the amount of light reflected from the original and detecting the insufficient amount of light, it is possible to detect a trouble due to, for example, replacement of the illumination lamp or the like, or a decrease in power supply voltage.

Further, the scanner unit 2 is particularly composed of the support 2-6.
Although scanning is started from the home position of "a", if the home position is not detected for some reason, the simulation is performed to detect the home position as a trouble. Even in such a state, it is not a trouble of the printer unit 3, so that the recording operation is possible and it is detected that it is the pause period in the copy mode. At this time, when the home position is detected, the operation of the scanner unit is stopped, and the fact that the trouble is removed is sent to the CPU 44. If the copy data is ready, the transfer image data is recorded. It becomes possible to suspend the recording at the time when the break is good and start recording the copy data in the copy mode.

The original document may not be automatically conveyed, but may be manually placed at the reading position. Even in such a case, the recording operation of the printer unit 3 is suspended. In this case, ADF
2-1 can be opened, and when the document is manually replaced on the document table 2-0, the time when the opening of the ADF 2-1 is detected can be easily detected as the start time of the rest period of the printer unit 3. The CPU 44 can easily detect the opening timing. In addition, from the start of the pause, the scanner unit 2-2 operates, the image of the original is read, and the read data is imaged as copy data.

Further, there is an idle period in the printer section 3. In some cases, the recording operation currently being executed must be interrupted. For example, if there is no sheet of the size for which recording is being performed, this recording operation cannot be continued and is temporarily suspended. However, the printer unit 3 is not only able to continue the recording operation with the copy data, and can perform the recording operation with the sheets of other sizes. Even in such a state, it is confirmed that the CPU 44 detects the start of the pause and records the external data transferred from the external devices A to C on a sheet other than the temporarily interrupted size sheet. For example, recording with the external data transferred from the external device can be executed.

As described above, when the CPU 44 detects the pause start time of the pause period in the printer unit 3 during the recording of the copy data of the document in the copy mode by the digital copying machine 1. From this point, the external data transferred from the external device is recorded. Therefore,
The utilization efficiency in the printer unit 3, that is, the operating rate can be improved, and the recording of image data from another external device can be performed in combination with the recording in the copy mode.

Next, various examples of the digital copying machine 1 in the above-described image recording will be sequentially described in each embodiment.

(First Embodiment) FIG. 6 is a time chart showing the operating condition of the printer section in the digital copying machine 1 for recording the external data transferred from any of the external devices A to C. It is a chart. This is the time when the command signal of the external data and the recording request is received from any of the other external devices A to C during the recording of the copied data read by the digital copying machine 1. At t1, the time when the CPU 44 suspends the printer unit 3 is detected. Then, by confirming that the expansion of the external data transferred up to the time t1, that is, the expansion into the image data that can be recorded by the printer unit 3 in the digital copying machine 1 is completed, the time t1 At that time
The recording of the transferred external data is performed by the printer unit 3 in the printout mode.

At the time t2 when it is confirmed by the CPU 44 that the digital copying machine 1 has started to record the copy data of the printer unit 3, the copy data in the copy mode can be confirmed. Recording is restarted, and this operation is continued until the start time t3 of the next rest period.

The recording of the external data transferred from the external device may be started from the pause start time t1 which is the pause period of the printer section 3 of the digital copying machine 1, and the recording of the copy data in the copy mode may be started. At time t2 when it becomes possible, the image recording is interrupted at a good time, that is, when the image recording for one page is completed. Alternatively, in order to further increase the operating rate of the printer unit 3, this recording is continued until recording of all transferred external data is completed, and after this recording is completed, recording of copy data is performed at time t2.
You may make it execute more.

Here, recording of the external data in the printout mode is executed at times t1 and t3, and the recorded sheet and the recorded sheet of the copy data are naturally discharged to the discharge tray. It Therefore, the digital copying machine 1 is provided with an ejection tray for receiving the image-recorded sheet in the copy mode and an external ejection tray for receiving the sheet on which the external data is recorded by the external device.

Time t, which is the rest period of the printer unit 3
As described above, at the start of the pause at 1 and t3, the originals are exchanged, the exchanged originals are read, and image processing is performed, or troubles due to the ADF 2-1 occur, and the scanner unit 2 particularly the scanner unit 2-2. Some are based on troubles. Then, at the time of starting the recording operation with the copy data at the time t2, the image reading by the exchange of the original document and the processing thereof can be completed and the recording of the copy data can be started, or the trouble of the ADF 2-1 or the scanner unit 2 can be released. When the recording of the copied data is started and the recording of the external data is completed, or the recording operation of the external data recording operation is completed at a good interval, in particular, the sheet recording for one page is completed. is there.

(Second Embodiment) In this embodiment, the priority order of image data transferred from an external device is determined, and the image data of the apparatus is recorded. That is, in the external data transferred from a plurality of external devices, for example, the external devices A to C, the recording order of the external data is determined and the recording is performed according to the priority order.

The determination of the above-mentioned priority order is to improve the operating rate of the printer section 3 of the digital copying machine 1.
During the pause period in which the continuous operation in the copy mode in the printer unit 3 cannot be performed, that is, as described above, when the image processing is performed by exchanging the document, the ADF 2-1 or the scanner unit has a trouble, the size fed in the copy mode and Priority is given to those that perform recording that matches sheets of the same size. That is, if the sheets to be processed have the same size,
In the paper feeding unit, it is not necessary to continuously switch and feed the paper of that size, the paper feeding unit can be executed as it is, and the trouble of selecting and switching the sheet can be saved. Therefore, the sheets of the same size can be fed in advance to the registration roller position, so that the recording of the image data from the external device can be directly performed by the printer unit 3 without the stop time of the recording operation.

Therefore, as shown in FIG. 7, the external data from the external device A is recorded on, for example, a B5 size sheet, and the external data from the external device B is A4.
It is assumed that recording is performed on a size sheet, and further, external data from the external device C is recorded on a B4 size sheet. Further, in the digital copying machine 1, it is assumed that the image recording on the sheet of B5 size is continued in the copy mode.

As shown in FIG. 7, the digital copying machine 1 continues to record copy data until time t1. Then, the external data (A) transferred from the external device A is prioritized for recording based on the detection of the start of the pause period (at time t1) in the printer unit 3. This recording is continued until the recording of the data is completed in order to increase the operating rate of the printer unit 3. Then, at the time t2 when the recording of the external data is completed, if the preparation for the recording operation is completed by the copy data, the recording operation in the copy mode is restarted.

Subsequently, at time t3 when the recording operation in the copy mode of the digital copying machine 1 is again suspended, the recording of the external data (B) in the external device B is started. This means that if the sheets mounted on the digital copying machine 1 are B5 and A4 size sheets mounted on the sheet feeding device 34a or 34b, the recording operation in the external device C is naturally executed. It cannot be done as it is. Therefore, the recording of the external data (B) transferred from the external device B is executed by the printer unit 3 of the digital copying machine 1. Even in this recording operation,
With the recording of the external data (B) completed, the image recording operation of the document in the copy mode is executed from time t4. The start of the recording operation at time t4 is on condition that the copy data of the document is ready for recording.

Here, even if the external data is received by the external device C, the recording operation is not started. Therefore, on the side of the digital copying machine 1, when the recording operation of the external device B is completed, a notification is given that the sheet size for recording by the external device C should be attached to the main body of the copying machine 1. In this notification, it is extremely disadvantageous that a B4 size sheet is mounted instead of the selection size B5 in the copy mode of the digital copying machine 1. That is, the continuous recording operation in the copy mode cannot be executed. Therefore, the other side, which has the size A4, is informed of a message that the size B4 sheet should be mounted.

The external data in the above-mentioned external devices A to C is received, and the priority of the start of the recording operation of the external data is determined such that the external data (A) having the same size as the copy mode is the highest priority. It is determined by the presence of the size installed in the digital copying machine 1. However, it may be determined on the condition that not only the size as described above but also the function that the digital copying machine 1 can process can be utilized. For example, when the digital copying machine 1 side cannot process even if the stapling process is instructed, the recording of the external data is removed from the priority order, and the other external data is recorded by the digital copying machine side in the recording condition instruction. Prioritize what can be handled correspondingly. By doing so, the digital copying machine 1 side can select and process a required function without interrupting the recording operation of the printer unit 3.

As described above, when the external data transferred from the external device is recorded on the digital copying machine 1 side, the external device cannot fully understand the functions that the digital copying machine 1 can process. That is, since the external device is distant from the digital copying machine 1, it may instruct a function that cannot be processed, and the recording of data from the instructed external device will be sent later. Then, the fact that the processing by the instructed function cannot be performed is returned to the external device, and recording is started in the state in which the function is canceled according to the above-described priority order and the like.

Therefore, when the recording condition in the external data from the external device A coincides with the condition that can be processed in the digital copying machine 1, the external data (A) is given the highest priority and the digital copying machine 1 as described above. The recording operation can be executed from the start of the rest period of the printer unit 3. As a result, there is an effect that the downtime of the recording operation in the printer unit 3 is eliminated and the operating rate is further fixed.

(Third Embodiment) Next, in the digital copying machine 1, although it is not a trouble in the printer section 3,
The recording process of the external data from the external device when the recording operation in the printer unit 3 cannot be continued during the image recording in the copy mode will be described.

In the above-described first and second embodiments, since there is data to be printed in the printer unit 3, the printing operation can be continued as it is, especially when replacing the document, troubles on the ADF 2-1 side, or the scanner. In the trouble of the section 2-2, the external data is recorded from the external device at the start of the pause period when the recording operation in the copy mode cannot be continued. However, there is a case where the continuous operation in the printer unit 3 cannot be performed because it is not the rest period which is a problem different from the printer unit 3 described above. This is not a trouble of the printer unit 3,
This is a case where the sheets being fed run out during the continuation of the recording operation.

Therefore, referring to FIG. 8, when the recording operation is executed in the copy mode in the digital copying machine 1 as described above, the external data is transferred from each of the external devices A to C, and the printer unit 3 operates. The external data expanded into a recordable state is temporarily stored in the memory 43. Then, at time t5 when the sheets of the size A4 executed in the copy mode are exhausted, the external device A
The image recording of the external data (A) from is executed.

That is, in the recording operation in the copy mode, the recording operation cannot be continued when there are no more sheets of size A4 being fed. Therefore, the printer unit 3
There is no problem in executing the printing operation, and if there is data to be printed, an image corresponding to the data can be printed on the sheet. Therefore, the printer unit 3
Is determined by the CPU 44 at time t5 as a temporary suspension period. As a result, the recording operation of the external data (A) from the external device A is started from the time t5.

In the recording of the external data by the external device A, the sheet size A4 to be processed in the external device B is lost at the time of recording in the copy mode, the recording by the size sheet cannot be performed, and the external device C is external This is because the sheet size is B4 according to the data, and a sheet of this size is not attached to the digital copying machine 1.

When the recording of the external data (A) in the external apparatus A is completed as described above, if a sheet of size A4, which was lost during recording, is attached to the main body of the copying machine, recording on this sheet is completed. The recording operation in the copy mode for performing is restarted. However, if the sheet of that size is not loaded, the printer unit 3 is in a rest state, and when the sheet of B4 or A4 size is loaded, recording of data that matches the loaded size is executed. Therefore, the stop time of the recording operation in the printer unit 3 can be reduced as much as possible, which leads to the improvement of the operating rate.

(Fourth Embodiment) As described above, the external data transferred from the external device is transferred to the printer while the digital copying machine 1 is executing the recording operation of the image of the document read in the copy mode as the copy data. The form in which image recording (printout) is performed using the start point of the rest period of the section 3 has been described.

However, the digital copying machine 1 does not always perform the recording operation at the timing as described above, and the read image data is image-processed and output as copy data, which is stored in the memory 43. External data may be transferred from an external device and a recording command for this external data may be issued during an idle period during the period.
In such a case, in any case, the printer unit 3 is in a rest state in which the printing operation is not executed. Therefore, in the external data from the external device, the printer unit 3
If the expansion to the data that can be processed by is completed first,
In order to record this external data, the printer section 3 is set to a print mode and image recording is executed.

As shown in FIG. 9, as an example, in the period in which the image of the original is read on the digital copying machine 1 side and the read data is image-processed into copy data which can be recorded by the printer unit 3, either external unit is used. The external data from the apparatus is received, and the external data is expanded into data that can be printed by the printer unit 3. In this period, the printer unit 3 executes the image recording operation by giving priority to the earlier one.

Therefore, when the original includes an image such as a photograph, it may take time to perform image processing on the copy data that can be recorded by the printer unit 3. Therefore, if the expansion of the external data from the external device into the recordable data is completed, the expansion of the external data at this point, that is, at time t6, is faster than the image processing of the copy data, and therefore the digital copying machine 1 First executes the image recording operation of the printer unit 3 in the printout mode. If the recording of the external data is completed and the image processing is completed by using the read data of the copy original as the copy data, the recording operation is performed by the read image in the copy mode from time t7 when the recording operation of the external data is completed. Run.

Expanding the external data into data recordable by the printer unit 3 means that the page description language (PDL) sent from an external device is interpreted and the image processing unit can record the data in the printer unit 3. Refers to conversion to bit data. Also, compressed data is transferred from the external device in order to shorten the transfer time and the like. This compressed data may be demodulated and converted into bit data that can be recorded by the printer unit 3. Also, when recording characters or symbols, in order to shorten the transfer time,
It also includes converting the sent code data into bit data.

(Fifth Embodiment) It should be noted that the external device may directly transfer the bit data that can be recorded in the printer unit 3 in advance, instead of the above-mentioned data. In such a case, the recording operation can be executed via the printer unit 3 by storing the data as it is.

Therefore, in the digital copying machine 1, it takes a considerable time to read an image of a document, image-process the read data, and convert the read data into copy data. This is performed for each copy document. On the other hand, since it is not necessary to read an image of external data transferred from an external device,
It simply expands the transferred external data into recordable data. Therefore, in the digital copying machine 1, the transfer rate from the external device is preferentially recorded, so that the operating rate of the printer unit 3 can be increased.

That is, as shown in FIG. 10, during execution of image recording in the copy mode (during execution of copying), external data is transferred from the external device and expanded. At time 8 when this expansion is completed, the copy mode is switched to the printout mode.
This switching is 1 during image recording in the copy mode.
Wait until the time when recording on one sheet is completed. In this state, the recording operation of the copied data is temporarily interrupted. Then, the recording operation of the external data is executed from time t8, and when this recording is completed, the mode is switched to the copying mode from time 9 and the recording operation of the copied data from the interrupted time point is restarted.

During execution of the recording operation in this copy mode, if external data is newly transferred from the external device, the external data is expanded, and when this expansion is completed, the external data is transferred as described above. The mode is switched to the printout mode for recording, and this operation is executed.

During the execution of the external data recording operation in the printout mode, the image recording of the copied data cannot be performed on the digital copying machine 1 side, especially from time t8 to t9. Therefore, the scanner unit 2 is operated to perform the reading process of the next original document, the image process of the read data into the copy data, and the sequential storing in the storage unit 43. Therefore, when the recording of the external data in the print-out mode is completed, the recording of the already read data and the image-processed copy data can be continued.

Here, while the recording operation in the copy mode is suspended, the image reading of the original document is executed in parallel with the recording operation of the external data. Image reading. Therefore, A
The document is exchanged by the DF2-1 or the document is manually exchanged, the exchanged document is read, converted into copy data, and sequentially stored in the storage unit 43. Therefore, AD
By using F2-1, etc., the image of the original can be read in advance and stored, and after completion of the external data recording process, each read copy data is paused. The printer unit 3 can continuously perform recording processing without creating a period.

From the above, during the recording operation in any mode of the printer unit 3, the development of the external data or the image processing of the read data of the original can be performed in parallel.
The operating rate of the printer unit 3 can be further increased. Moreover, when switching from the copy mode to the printout mode, as described in the above-described first to third embodiments, when the recording operation is continued, it is switched after waiting for the continuous recording to be completed. By doing so, the operating efficiency can be further improved. That is, when the expansion of the external data is completed, it is not switched immediately, but when the recording operation in the copy mode is continued, the operation is continued and switched when the recording operation is interrupted.

[0118]

As described above, according to the image forming apparatus of the present invention, the reading data of an original is recorded and the recording of the external data transferred from the external device is effective during the pause period of the printer section. You can use it. Therefore, it is possible to increase the operating rate of the printer unit and process the copy of the document or the recording time of the external data in a short time.

Therefore, by preferentially executing the recording of the external data related to the recording of the copied data, the down time of the printer unit can be further shortened, so that the operating rate of the printer unit can be further improved. It will be possible.

Moreover, when returning to the copy data recording operation mode, the recording operation of the printer unit is stopped by performing the recording at the time when the recording of the external data is completed or at the time when the recording of the sheet of the external data is completed. Without letting
The recording operation can be continued continuously, and the effect of improving the operating rate of the printer unit is increased.

By giving priority to the recording of the external data, the image reading and the image processing can be performed during the recording of the external data, and the processing such as the expansion of the external data can be performed at the time of recording the copied data. The operating rate of the printer unit can be further increased.

[Brief description of the drawings]

FIG. 1 is an overall system diagram showing a state in which an image forming apparatus and an external device according to the present invention are connected via a communication line.

FIG. 2 is a cross-sectional view showing the internal structure of the image forming apparatus according to the present invention.

FIG. 3 is a block configuration diagram showing a circuit configuration of an image forming apparatus of the present invention, particularly an image processing unit of a digital copying machine.

FIG. 4 is an overall control block configuration diagram related to image processing and sheet discharge processing including an image processing unit of a digital copying machine.

FIG. 5 is a plan view showing an example of an operation panel portion of the digital copying machine.

FIG. 6 is a timing chart for explaining the first embodiment of the present invention.

FIG. 7 is a timing chart for explaining the second embodiment of the present invention.

FIG. 8 is a timing chart for explaining a third embodiment of the present invention.

FIG. 9 is a timing chart for explaining a fourth embodiment of the present invention.

FIG. 10 is a timing chart for explaining a fifth embodiment of the present invention.

FIG. 11 is a block configuration diagram showing a conventional technique of an image forming apparatus.

[Explanation of symbols]

1 Digital Copy Machine 2 Scanner Section 2-1 ADF (Automatic Document Feeder) 2-2 Scanner Unit 3 Printer Section 30 Laser Writing Unit 31 Image Forming Process 32 Photoreceptor 40 Image Data Input Section 41 Image Processing Section 42 Image Data Output Section 43 storage unit (memory / hard disk) 44 CPU (control unit) 47 communication unit 48 communication line A to C external device (personal computer / word processor)

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Claims (7)

[Claims] 1. A scanner unit for reading an image of a document, and a printer unit for recording the data read by the scanner unit as copy data on a sheet, and external data transferred from an external device on the sheet. In an image forming apparatus capable of performing recording processing as needed via the printer section, a series of recording operations for reading an image of a document by the scanner section and recording the read data as copy data on a sheet When external data is transferred from the external device in the state of executing, the printer unit detects a pause period during which the printing operation cannot be continuously executed, and at the time of the detection, the copy data is recorded. An image forming apparatus, characterized in that the operation is temporarily suspended and the external data recording operation is executed. 2. The pause period during which the printer unit cannot continuously execute the recording operation while the printer unit is executing a series of recording operations of the copy data is the original when the original is exchanged for reading an image of the original. 2. The image forming apparatus according to claim 1, wherein the image forming apparatus has a trouble of a scanner unit or a trouble of a document feeder for feeding a document to a reading position during image reading and image processing. 3. When external data is transferred from a plurality of external devices, priority is given to the external data that can be processed by the image forming apparatus main body among the external data, and the recording operation of the copy data is continued. At the time of suspension when it became impossible to execute,
The image forming apparatus according to claim 1, wherein a recording operation of external data is executed. 4. When the printer section is continuously recording the copy data, it is a pause period in which the recording operation of the copy data cannot be executed on condition that the sheets for the recording are exhausted. When the external data is detected and the recording operation of the external data is executed at the time of the detection, if the external data is recorded on another sheet different from the above-mentioned lost sheet, the recording of the external data is executed. The image forming apparatus according to claim 1. 5. The external data recording operation returns to the copy data recording operation mode when all the external data is completed or when the recording operation based on the copied data is ready to be executed. The image forming apparatus according to claim 1 or 4. 6. A scanner unit for reading an image of a document, and a printer unit for recording the data read by the scanner unit as copy data on a sheet, and external data transferred from an external device on the sheet. In an image forming apparatus capable of performing a recording process as needed via the printer unit, the printer unit is completed when the external data transferred from the external device is expanded into data that can be recorded by the printer unit. The image forming apparatus is characterized in that the external data recording is performed with priority, and when the recording of the external data is completed, the mode is switched to the mode in which the recording of the copy data is performed. 7. A process of reading an image of a document by a scanner unit and a process of image-processing the read data to obtain copy data in parallel while the printer unit records the external data. The image forming apparatus according to claim 5, which is executed.