JPH06105034A - Both-side image forming device - Google Patents

Abstract

PURPOSE:To record the monochromatic or color images of plural originals in which a both-side original and a one-side original are mixed on recording paper with arbitrary arrangement. CONSTITUTION:This device is comprised in such a way that the recording of both-side and one-side images can be performed by providing an automatic document feeder(ADF) I with inversion function and a both-side recording paper carrier device (ADU) V at a device, and furthermore, a copying process can be converted by providing four kinds of recording modes of an image, and the monochromatic or color images of the original D in which the both-side image and the one-side image are mixed are recorded on the surface of the recording paper or the surface and back side of it sequentially, or they can be selected arbitrarily so as to be recorded in the same mode as that of the original D by designating a recording mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided image forming apparatus capable of automatically specifying and copying mixed originals having images on one side and both sides of the transfer material.

[0002]

2. Description of the Related Art In a conventional double-sided image forming apparatus equipped with an automatic document feeder, when a large number of originals are continuously copied, the user must preliminarily determine whether the original image is on one side or both sides. After confirmation, the copy process is designated as either one-sided mode or two-sided mode to start copying.

[0003]

Therefore, when a single-sided and double-sided mixed original is continuously copied by such a double-sided image forming apparatus, the original is divided into a single-sided original and a double-sided original and placed separately. Since it is necessary to specify the copy mode and perform copying, the work becomes extremely inefficient.

The present invention solves this problem and improves it.
It is an object of the present invention to provide a double-sided image forming apparatus capable of automatically supporting a copy mode for a single-sided and double-sided mixed document as described above and recording an image in an arbitrary copy mode designated. is there.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a double-sided image forming apparatus for continuously inputting a plurality of originals in which originals printed on one side and both sides are mixed and sequentially outputting copies of the originals. An original feeding means and a determining means for determining whether the original is single-sided printing or double-sided printing and whether it is a monochrome image or a color image,
The present invention is achieved by a double-sided image forming apparatus characterized in that the copy is output in a selected mode of one-sided copy, double-sided copy, or mixed copy of single-sided and double-sided copy.

[0006]

FIG. 1 and FIG. 2 are sectional views showing an embodiment of a double-sided image forming apparatus according to the present invention. The apparatus is an automatic document feeder (ADF) I with a reversing function, and an image. The reading unit II, the image exposing unit III, the image forming unit IV, and the double-sided recording paper conveying device (ADU) V are included.

First, the copying process of a single-sided image original by the apparatus will be described with reference to FIG. The document D is stacked on the document placement table 1 of the ADFI with the image surface facing downward, and is sequentially carried out from the uppermost document by the rotation of the carry-out roller 2 when the copy button is turned on.

The conveyed document D is fed by the double feed prevention roller 3 so that only one of the uppermost layers thereof is separated and fed, and then fed onto the platen glass 5 via the feeding belt 4.

Document D fed on the platen glass 5
When the tip is detected by the photo sensor S1,
The rotation (clockwise rotation) of the conveyor belt 4 is stopped and the document D is stopped at a predetermined exposure position.

Next, the image reading section II is activated and the exposure lamp
An original image is received by a color CCD 14 via an image forming lens 13 by an exposure scan by a first mirror 11 which is integrated with 10 and a second mirror unit 12 which follows and moves at a speed of 1/2 of that, and image data is received. Is temporarily stored in the memory. This image data is taken out at the time of recording an image and input to the image exposure unit III.

When the original image is a color image, the first color signal is input from the memory to the image exposure unit III, the laser beam generated by the semiconductor laser (not shown) is rotationally scanned by the polygon mirror 16, and the fθ lens is used. After passing through 17, the optical path is bent by the mirror 18 and projected onto the peripheral surface of the photoconductor drum 20 to which electric charges have been previously applied by the charger 21 to form a bright line.

On the other hand, when the scanning is started, the beam is detected by the index sensor, the modulation of the beam by the first color signal is started, and the modulated beam scans the peripheral surface of the photosensitive drum 20. Therefore, a latent image corresponding to the first color is formed on the peripheral surface of the photosensitive drum 20 by the main scanning by the laser beam and the double scanning by the conveyance of the photosensitive drum 20. This latent image is subjected to reversal development in a non-contact state by the developing device 22Y loaded with yellow (Y) toner (visual medium) in the developing means to form a toner image on the drum surface. The obtained toner image passes under the cleaning device 29, which is a cleaning means separated from the peripheral surface of the photosensitive drum 20 while being held on the drum surface, and enters the next copy cycle.

That is, the photoconductor drum 20 has the charger 21.
Then, the second color signal output from the signal processing unit is input to the image exposure unit III, and writing is performed on the drum surface in the same manner as in the case of the first color signal described above. The image is formed. The latent image is subjected to reversal development in a non-contact state by the developing device 22M loaded with magenta (M) toner as the second color.

The magenta (M) toner image is formed in the presence of the previously formed yellow (Y) toner image.

Reference numeral 22C is a developing device having cyan (C) toner, which forms a cyan (C) toner image on the drum surface based on a control signal generated by a signal processing section.

Further, 22B is a developing device having black toner, which is formed by superimposing a black toner image on the drum surface by the same process. These developing devices 22Y, 22
A DC or AC bias is applied to each of the M, 22C, and 22B sleeves to perform jumping development with a one-component or two-component developer, which is a developing means, and is not applied to the photosensitive drum 20 whose base is grounded. Reversal development is performed by contact.

On the other hand, when the image reading is completed, the conveyor belt 4 is rotated again to eject the document D onto the document tray 8 via the reversing guide portion 6 and the paper ejection roller 7. If the color CCD 14 does not detect an image, the document D
Are sent to the document tray 8 without being stopped on the platen glass 5. Therefore, the exposure operation described above by the image exposure unit II is not performed.

In the ADUV, the recording paper is unloaded from the paper feed cassette 30 in parallel with the processes of the image exposure unit III and the image forming unit IV, and the double feed prevention roller 31 is used.
One sheet of recording paper is fed by the
Is fed to the timing roller 34 through the photosensitive drum 20.
By the rotation of the timing roller 34 synchronized with the upper toner image, the sheet is fed to the image transfer area.

The recording paper fed to the image transfer area is transferred with a toner image on the drum by a transfer device 23, separated from the drum surface by a static eliminator 24, and fed to a fixing device 26 via a conveyor belt 25. The toner is sent and fixed by welding, and then discharged to the recording paper tray 28 via the discharge rollers 27A and 27B.

On the other hand, the photosensitive drum 20 with the recording paper separated
At the fifth lap, the blade 29 of the cleaning device 29
The residual toner is removed / cleaned by receiving the pressure contact of A, and after one round, the charger 21 receives the charge again to start the next image forming process.

When the original image is a monochrome image, only the color signal corresponding to black is input from the memory to the image exposure unit III, and the developing device 22B forms a monochrome toner image.

Next, the copying process of a double-sided image original by the above apparatus will be described with reference to FIG.

The document D carried out from the document table 1 is first subjected to the exposure and formation of the image on the front side and the transfer and fixing to the recording paper by the same copying process as in the case of the one-sided image document described above.

The recording paper which has been fixed is discharged onto the intermediate tray 37 by the guides of the guide members G2 and G3 which are previously rotated to the positions shown by the solid lines and the rotation of the conveying rollers 35 and 36, and the photo sensor. It is stopped while being clamped to the conveyance roller 36, which has stopped rotating due to the detection signal of the rear end portion in S2.

On the other hand, the document D, which has been exposed and has been fed to the reversal guide section 6, is guided by the guide member G1 which has been rotated in advance to the position indicated by the solid line, and the reverse rotation action of the conveyor belt 4 (counterclockwise). It is fed again to the platen glass 5 in a state of being turned upside down by directional rotation), and in this case, the photosensor S1 whose detection mode has been switched detects the rear end of the platen glass 5, and the platen glass 5 is stopped at a predetermined exposure position.

Then, in synchronism with the start of exposure and formation of the image on the back side of the document D, the conveying roller 36 reversely rotates, and the guide members G1, G2, and G3 all rotate to the positions indicated by broken lines. To be done.

Therefore, the recording paper on the intermediate tray 37 is fed again, turned upside down, and then fed to the paper feed guide section 33 through the transport rollers 38 and 39, and then the timing roller.
The paper is fed to the image transfer area via 34 and the image is transferred and fixed on the back surface thereof.

Thus, the recording paper on which images are recorded on both sides passes over the guide member G2 by the paper discharge rollers 27A and 27B and is discharged onto the recording paper tray 28, while the document D on which the double-sided image is exposed is finished. Is rotated by the restart of the conveyor belt 4 (clockwise rotation), and then the front and back sides are reversed and the guide member G1 is rotated.
And is discharged onto the document tray 8 via the paper discharge roller 7.

Further, the copying process of an original having a mixture of monochrome or color single-sided images and double-sided images by the apparatus of the present invention will be described with reference to the flowcharts of FIGS. 4 to 7.

As shown in FIG. 3 (a), the target original D includes one having an image only on the front surface, one having an image on the front and back, and one having an image only on the back, as shown in the figure. It shall be copied in order.

As for the recording of the image on the recording paper, the recording mode 1 in which all the images are recorded on one side of the recording paper in advance as shown in the figure, the recording mode 2 in which the mode is completely the same as the original, and the image are recorded. Recording mode 3 in which the images are sequentially recorded on both sides of the recording paper, and a recording mode 4 in which an image of an original having a color image on both sides or one side is further recorded.
One of the modes is designated by a mode designation button provided on the operation unit of the double-sided image forming apparatus.

By designating the above mode, FIG.
By the operation of the control unit shown in (b), the ADFI, AD for the original and the recording paper are adjusted in accordance with each image recording mode.
After the UV has fulfilled each function, the image reading section II, the image exposing section III and the image forming section IV described above are activated to execute the copying process in the required recording mode.

First, the copying process in the recording mode 1 for a monochrome image will be described with reference to FIG.

When the copy button is turned on, the conveyance of the original D on the original table 1 and the recording paper in the paper feed cassette 30 starts, and the original D moves on the platen glass 5 to read an image in a stationary state. The color CCD 14 of the section II first determines whether or not there is an image on the surface, and then the front and back sides are guided by the guide member G1 rotated through the reversing guide section 6 to the angle shown in FIG. The sheet is fed again onto the platen glass 5 in the inverted state, and it is determined whether or not there is an image on the back surface.

When the color CCD 14 detects an image on both the front surface and the back surface, the document D passes through the reversing guide portion 6 again by the forward rotation action of the transport belt 4 and then passes through the reverse rotation action of the guide member G1 and the transport belt 4. The sheet is fed downward onto the platen glass and stopped on the exposure surface by the rear end detection signal of the photosensor S1. Thus, the image on the front side of the original is printed on the recording paper tray 28 after recording the image in the same process as that for copying the single-sided original described above.

Next, the original D is reversed on the front and back in exactly the same process as the case of copying the double-sided image described above, and then the image on the back is recorded on a new recording paper.
When the image on the back side is not detected, the copying process is finished with recording the image on the front side, and the document D is discharged. When the front side image is not detected and the back side image is detected, the document D is inverted by the ADFI and then the image is recorded on a new recording sheet.

Thus, each image of the document D is recorded on the surface of the image, the image, the image, the image and the recording paper in the copy order as shown in the recording mode (1) of FIG.

After the image on the back side is recorded, the document D is turned over again and discharged with the front side facing up.

Next, the copying process in the recording mode 2 will be described with reference to FIG.

When the image of the original D is detected by the color CCD 14 and it is determined that the original D is a double-sided original, the image on the front side is first recorded, and then the recording paper on which the image is recorded is set to A.
An image on the back side of the document is recorded on the back side of the recording sheet by reversing the front and back sides of the document D by the DUV and the ADFI, respectively.

When the original D is a single-sided original having an image on the front side, an image is recorded by the same copying process as the above-described original with a single-sided image, and the original D is a single-sided original having an image on the back. In some cases, the recording paper carried out from the paper feed cassette 30 is reversed by the ADUV without recording an image on the front surface thereof, and the document D is reversed on the front side without receiving the image reading on the front surface, and then the image recording is performed. Done. In the recording mode 2, the document is ejected and the recording paper is ejected almost at the same time.

Thus, each image of the original D is recorded in the same manner as the original as shown in the recording mode (2) of FIG. 3A, so that the image is recorded on the front surface of the recording paper, the image on the front and back surfaces, and the back surface. .

Further, the copying process in the recording mode 3 will be described with reference to FIGS. 6 and 7.

When the original D is judged to be a double-sided original, an image on the front surface of the original D is first formed, and this image is recorded on either A or B recording paper shown in FIG. That is, when the recording paper is the new recording paper A directly carried out from the paper feed cassette 30, the front surface image of the document D is recorded on the surface of the new recording paper A, and then the recording paper is turned upside down by ADUV. And wait for re-feeding. On the other hand, when the recording paper is the recorded recording paper B which has already recorded an image on the front surface and has been discharged from the ADUV, the front surface image of the document D is recorded on the back surface of the recording paper B and the recording paper B is discharged. After that, the delivery of the new recording paper A is waited. The document D on which the front side image has been recorded is turned upside down by the ADFI and is recorded on the back side of the new recording sheet A or the front side of the newly fed new recording sheet A. The document D, which has been recorded on the front and back sides, is discharged to the outside. Further, the recording paper A on which the recording on the back side has been completed is discharged to the outside, and the recording paper A on which the recording has been performed on the front side is reversed by ADUV and waits for re-feeding.

If the original D is a single-sided original having an image only on the front side, the image on the front side is recorded on either the new recording paper A or the recorded recording paper B described above, while the original D is on the back side. A for single-sided originals with only images
New recording paper A after reversing the front and back of original D by DFI
An image is recorded on the surface of the recording paper B or on the surface of the recording paper B.

Thus, each image of the document D is sequentially recorded on the front and back sides of the recording paper in the order of copying as shown in the recording mode (3) of FIG. 3A.

The present invention forms a color image only on one side (front side) of the recording paper when the original has a color image and discharges it. When the original is a one-sided color original,
Regardless of whether or not there is a recording sheet previously recorded (if the recording sheet is in the intermediate tray, it is ejected), and a color image is formed and ejected only on one side of the new recording sheet.

Next, the copying process when a double-sided original contains a color image will be described with reference to FIG. When it is determined that the image of the document D is a color image on both sides, first, if there is a recording sheet on the intermediate tray 37, the recording sheet is discharged, and then the image formation of the color image on the surface of the document D is started and the above-described process is performed. The color toner image formed by is recorded on the recording paper fed from the paper feed cassette 30. This recording paper is immediately printed on the recording paper tray without recording an image on the back side.
Emitted on 28.

Next, the document D is turned upside down and a color image is formed on the back side, and this is recorded on a new recording sheet fed from the sheet feeding cassette 30 and immediately after the recording sheet tray 28. Discharged on top.

The document D on which the color image on the back side has been recorded is turned over again and discharged onto the document tray 8 with the front side facing upward.

When it is determined that the surface of the document D is a color image, first, if there is a recording sheet on the intermediate tray 37, it is discharged, and then the color toner image on which the color image on the surface is formed is fed. It is recorded on the recording paper fed from the cassette 30. This recording paper is also immediately discharged onto the recording paper tray 28 without recording an image on the back surface.

Next, the document D is turned upside down, a monochrome image on the back side is formed, and this is recorded on a new recording paper fed from the paper feeding cassette 30, and this recording paper is stored in the intermediate tray 37. .

On the other hand, the document D on which the monochrome image on the back side has been recorded is reversed again and discharged onto the document tray 8 with the front side facing upward.

Further, when it is determined that the back side of the document D is a color image, the monochrome image on the front side is recorded on either A or B recording paper shown in FIG. That is, when the recording paper is the new recording paper A directly fed from the paper feed cassette 30, the monochrome image on the front surface of the original D is recorded on the front surface of the new recording paper A, and then the recording paper is read by ADUV. It is turned over and is ready to be re-fed.

On the other hand, the recording paper records an image on the front surface of the ADU.
In the case where the recording paper B has been discharged from V, the monochrome image of the document D is recorded on the back surface of the recording paper B.

Next, the original D is turned upside down and a color image on the back side is formed, and this is recorded on a new recording paper fed from the paper feeding cassette 30, and the recording paper is fed to the recording paper tray 28.
At the same time as the sheet is discharged to the upper side, the sheet is discharged to the original tray 8 with the front side turned upside down and the front side facing upward.

[0057]

According to the present invention, regardless of whether it is a double-sided original, a single-sided original, or a mixed original of double-sided / single-sided, a copy can be copied in an arbitrary mode by selecting a monochrome or color copy mode. As a result, a double-sided image forming apparatus for use will be realized, and as a result, even if a document having irregularly arranged images is used, it is possible to record the image on the recording paper as it is or as it is arranged. It is now possible to provide an extremely useful device.

[Brief description of drawings]

FIG. 1 is a sectional configuration diagram (1) of a color double-sided image forming apparatus of the present invention.

FIG. 2 is a sectional configuration diagram (2) of the color double-sided image forming apparatus of the present invention.

FIG. 3 is an explanatory diagram of each image recording mode by the device and a control circuit diagram thereof.

FIG. 4 is a flowchart showing a copying process in a recording mode 1.

FIG. 5 is a flowchart showing a copying process in recording mode 2.

FIG. 6 is a flowchart showing a copying process in recording mode 3.

FIG. 7 is a flowchart of recording paper fed in recording mode 3.

FIG. 8 is a flowchart showing a copying process in a recording mode 4.

[Explanation of symbols]

 1 Original Placement Table 4 Conveyor Belt 5 Platen Glass 6 Reversing Guide Section 8 Original Tray 11 First Mirror 12 Second Mirror 13 Imaging Lens 14 Third Mirror 20 Photosensitive Drum 21 Charger 22 (Y, M, C, B) Developing device 23 Transfer device 24 Static eliminator 25 Conveyor belt 26 Fixing device 27A, 27B Ejection roller 28 Recording paper tray 29 Cleaning device 30 Paper cassette 32, 33 Paper feed guide section 34 Timing roller 35, 36, 38, 39 Conveyor roller 37 Intermediate tray I Automatic document feeder (ADF) II Image reading unit III Image exposure unit IV Image forming unit V Double-sided recording paper transport unit (ADU) S1, S2 Photo sensors G1 to G3 Guide members

Claims (5)

[Claims] 1. A double-sided image forming apparatus for continuously inputting a plurality of originals in which originals printed on one side and both sides are mixed and sequentially outputting copies of the originals, a feeding means for the originals, and It has a discrimination means for discriminating whether the original is single-sided printing or double-sided printing, and whether it is a monochrome image or a color image, and the copy is a single-sided copy, a double-sided copy or a mixed copy of a single-sided and double-sided copy. A double-sided image forming apparatus, which outputs in any one of the selected modes. 2. The double-sided image forming apparatus according to claim 1, wherein all the images of the copy are controlled so as to have one side. 3. The double-sided image forming apparatus according to claim 1, wherein all the images of the copy are controlled so as to be double-sided. 4. The double-sided image forming apparatus according to claim 1, wherein the image of the copy is controlled to be the same as the original. 5. The double-sided image forming apparatus according to claim 1, wherein when the image of the original is a color image, the image of the copy is controlled so that all the images are on one side.