JPH0535151A - Method and device for image forming - Google Patents

Abstract

PURPOSE:To view a high-grade image from the back surface of an OHP sheet by forming a latent image corresponding to the erected image of an original image on a latent image carrier, and transferring an image obtained by means of developing the latent image on the OHP sheet. CONSTITUTION:In an OHP mode, an electrostatic latent image formed on a photosensitive drum 1 is developed by a developing device 16, and transferred on the OHP sheet, and a toner image is fixed through a fixing device 22, so that the mirror image of the original image is formed on the OHP sheet. Therefore, when this image is viewed from the back surface of the OHP sheet having smoothness and high gloss, the erected image having a high image density and a high grade, can be viewed, and the developed image on the OHP sheet is viewed from the surface opposite to the developed image surface, having high smoothness and uniform gloss compared with the developed image surface of the OHP sheet, so that the image having the high image density and high grade can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method and an image forming apparatus in an image forming apparatus such as a copying machine, a facsimile and a printer, and more particularly to an image forming method and an image forming apparatus using an OHP sheet as a transfer material. .

[0002]

2. Description of the Related Art In recent years, a copy obtained by an image forming method has a tendency to pursue higher image quality, and it is desired to copy to a wider variety of transfer materials. Among them, OHP
Copying on a sheet is widely used in presentations at academic conferences and the like, and there is a high demand for its image quality and handleability. OH
The transfer surface of the P sheet is often designated in terms of transferability and fixing property, and the designated transfer surface is subjected to surface treatment or the like in order to stabilize image formation. Therefore, the front surface, which is the transfer surface, has less gloss than the back surface, and when the front surface is porous, irregular reflection of light occurs and the image density decreases. When copying an OHP sheet on which a toner image is formed on the discharge tray, the OHP sheet is copied onto the discharge tray at the leading edge of the discharged OHP sheet in the transport direction. The toner image on the OHP sheet that has been printed may be partially scraped to cause image loss. Therefore, after removing the OHP sheet discharged onto the discharge tray from the discharge tray, It was necessary to consider such as pressing the copy start button for the next OHP sheet. Furthermore, since the OHP sheet has a higher volume resistance (about 10 ¹⁰ Ω or more) than plain paper, it is charged while passing through the conveyance path in the image forming apparatus,
When discharged onto the output tray, it may carry a considerable amount of static electricity. Therefore, when a plurality of OHP sheets are copied, they are overlapped on the discharge tray, and separation when projecting with OHP after that is troublesome. Further, since the OHP sheets are transparent, if a plurality of OHP sheets are overlapped with each other, the images formed on the OHP sheets overlap each other, making it difficult to read each of them. Therefore, after copying, peel off one by one and
I had to put interleaving paper between HP sheets.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object thereof is OHP.
An object of the present invention is to provide an image forming method and apparatus capable of forming an image having a glossy, uniform, and sufficient image density on a sheet, and a second object thereof is to sequentially obtain images of a plurality of original images by OHP. In a mode of forming on a sheet, a slip sheet on which an image of each original image is formed is automatically inserted between OHP sheets on which an image of each original image is formed, and is stacked on a discharge tray. OHP after image formation
It is an object of the present invention to provide an image forming apparatus capable of improving the handleability of sheets, and a third object thereof is to discharge and stack sheets on a sheet discharge tray in order to achieve the second object. It is an object of the present invention to provide an image forming apparatus capable of further improving the handleability of an OHP sheet after image formation by making the top and bottom of the image on the OHP sheet and the image on the interleaving paper coincide with each other. In the image forming apparatus having a mode in which images of a plurality of original images are sequentially formed on a transfer material and sequentially stacked on a paper discharge tray,
In order to achieve the above-mentioned object, it is possible to improve the handling property of the OHP sheet after the image formation by discharging and stacking the OHP sheets after the image formation on the discharge tray so that the OHP sheets after the image formation are arranged in the page order of the original image. It is to provide an image forming apparatus capable of performing the same.

[0004]

In order to achieve the first object, the invention of claim 1 forms a latent image corresponding to a normal image of a document on a latent image carrier, and the latent image is formed. The developed image obtained by developing is transferred onto an OHP sheet. In order to achieve the second object, the invention of claim 2 is an image forming apparatus having a mode for sequentially forming images of a plurality of original images on an OHP sheet,
In the mode, for one original image, a latent image corresponding to a normal image of the original image is formed on a latent image carrier, and the developed image obtained by developing the latent image is transferred onto an OHP sheet, The OHP sheet on which the developed image is transferred is discharged onto the discharge tray O
HP image forming operation, forming a latent image corresponding to a mirror image of a document image on the latent image carrier, developing the latent image and transferring the developed image onto an opaque transfer material, and the transfer material It is characterized in that a control means is provided for executing a slip sheet image forming operation for discharging the sheet onto the sheet discharge tray. In order to achieve the third object, the invention of claim 3 is the normal image forming apparatus of claim 2 for discharging the transfer material onto the discharge tray so that the developed image surface of the transfer material faces upward. The developed image on the discharge tray when the developed image surface of the transfer material is downward on the transport unit and the discharge tray and the top and bottom position of the developed image on the discharge tray is transported by the normal transport unit. And a reversing conveyance section for ejecting the paper so that it is opposite to the top and bottom position of
In the OHP image forming operation, the latent image formation is one of the original image.
After forming a latent image corresponding to a mirror image rotated by 80 degrees and discharging the paper onto the paper discharge tray is the paper discharge in the normal transport unit, the interleaf paper image forming operation is performed as follows. The latent image formation is the formation of a latent image corresponding to the normal image of the original image, and the paper discharge onto the paper discharge tray is the paper discharge in the reverse conveyance section. According to a fourth aspect of the present invention, in the image forming apparatus according to the second aspect, the normal conveyance unit and the reverse conveyance unit are provided, and the control unit performs the latent image formation as a document image as the interleaf image formation operation. After the latent image corresponding to the normal image is formed and the operation in which the paper is discharged onto the paper discharge tray is the paper discharge in the normal transport unit,
As the HP image forming operation, an operation in which the latent image formation is the formation of a latent image corresponding to a mirror image obtained by rotating the original image by 180 degrees, and the sheet discharge onto the sheet discharge tray is the sheet discharge at the reversing conveyance unit. According to a fifth aspect of the present invention, in the image forming apparatus according to the second aspect, the normal conveying unit and the reverse conveying unit are provided, and the control unit has the OH.
As the P image forming operation, after the latent image formation is the formation of a latent image corresponding to the mirror image of the original image, and the paper discharge onto the paper discharge tray is the paper discharge at the normal transport unit, As the interleaf sheet image forming operation, the latent image formation is the formation of a latent image corresponding to a normal image obtained by rotating the original image by 180 degrees, and the sheet discharge onto the sheet discharge tray is the sheet discharge at the reverse conveying unit. The invention according to claim 6 is characterized in that the invention of claim 6 is executed.
3. The image forming apparatus according to claim 2, further comprising the normal transport unit and the reverse transport unit, wherein the control unit corresponds to the normal image obtained by rotating the original image by 180 degrees as the slip sheet image forming operation. After the operation of forming a latent image and discharging the paper onto the paper discharge tray is the paper discharge in the normal conveying unit, the latent image formation is a mirror image of the original image as the OHP image forming operation. It is characterized in that the operation of forming a corresponding latent image and discharging the paper onto the paper discharge tray is the paper discharge in the reversal transport unit. In order to achieve the above-mentioned fourth object, the invention of claim 7 is a normal transport part for discharging a transfer material onto a discharge tray so that the developed image surface of the transfer material faces upward,
A reverse transport unit for discharging the transfer material so that the developed image surface of the transfer material faces downward on the discharge tray, and starting from the image formation of the document image of the last page of the plurality of document images. In an image forming apparatus having a mode in which images of original images of pages with a small number of pages are sequentially formed on a transfer material and sequentially stacked on a discharge tray, in the mode,
When an OHP sheet is selected as the transfer material, a latent image corresponding to the normal image of the original image is formed on the latent image carrier, and the developed image obtained by developing the latent image is transferred onto the OHP sheet. And a control means for performing an OHP image forming operation of transporting the OHP sheet on which the developed image is transferred by the normal transport unit and discharging the OHP sheet onto the discharge tray. The invention according to claim 8 is provided with the normal transport section and the reverse transport section according to claim 7, and starts from the image formation of the original image of the first page among a plurality of original images, and sequentially increases the number of pages. In the image forming apparatus having a mode in which an image of the original image is formed on the transfer material and sequentially stacked on the discharge tray, in the mode, the OHP is used as the transfer material.
When a sheet is selected, a latent image corresponding to the normal image of the original image is formed on the latent image carrier, the developed image obtained by developing the latent image is transferred onto the OHP sheet, and the developed image is obtained. Was transcribed
The present invention is characterized in that a control means is provided for carrying out an OHP image forming operation for carrying the HP sheet by the reversing carrying section and discharging the HP sheet onto the paper discharge tray.

[0005]

According to the invention of claim 1, a latent image corresponding to the normal image of the original image is formed on the latent image carrier, and the developed image obtained by developing the latent image is transferred onto an OHP sheet. Thus, the developed image on the OHP sheet can be viewed from the surface opposite to the developed image surface. According to the second aspect of the invention, the OHP image forming operation and the interleaf paper image forming operation are executed for one original image, and thus the image of each original image is formed on the OHP.
The interleaving paper on which the image of each original image is formed is automatically inserted between the sheets and stacked on the paper discharge tray. According to a third, fourth, fifth or sixth aspect of the invention, the predetermined OHP image forming operation and the interleaf paper image forming operation are executed, whereby the OH is discharged and stacked on the discharge tray.
The top and bottom of the image on the P sheet and the image on the slip sheet are made to coincide with each other. The invention according to claim 7 or 8 executes the above-mentioned predetermined OHP image forming operation and interleaf image forming operation,
As a result, the OHP sheets after the image formation are discharged and stacked on the discharge tray so that they are arranged in the page order of the original image.

[0006]

EXAMPLE An example in which the present invention is applied to an electrophotographic digital copying machine (hereinafter referred to as a copying machine) will be described. First, the schematic configuration of the copying machine will be described. The photosensitive drum 1, which is a latent image carrier, is rotationally driven clockwise. When a document is placed on the contact glass 2 and a print switch (not shown) is pressed, the document illumination light source 3 and the mirror 4 are pressed.
The scanning optical system 5 consisting of the above and the scanning optical system 8 consisting of the mirrors 6 and 7 move, and the reading scanning of the document is performed.
The image reading element 10 provided behind the lens 9
Then, the scanned image is read as an image signal. The read image signal is digitized and image-processed. A laser diode (LD) (not shown) is driven based on the image-processed signal, the laser light from the LD is reflected by the polygon mirror 13, and then is irradiated onto the photosensitive drum 1 via the mirror 14. As a result, optical writing with the laser light is performed on the photosensitive drum 1, and an electrostatic latent image is formed on the surface of the photosensitive drum that has already been uniformly charged by the charging charger 15. This electrostatic latent image is
A toner image is formed by the developing device 16, and is transferred to the transfer material sent from the paper supply unit 17 by corona discharge of the transfer charger 18. The transfer material onto which the toner image has been transferred is separated from the surface of the photosensitive drum 1 by the separation charger 19 and then conveyed by the conveyor belt 21 to fix the fixing roller pair 2
After the toner image is fixed through the second contact portion, the toner image is discharged onto the paper discharge tray 24, for example. On the other hand, the untransferred toner is removed from the surface of the photosensitive drum 1 after the transfer by the cleaning device 23, and the surface is prepared for the next copy.

The copying machine of this embodiment is provided with an automatic document feeder (hereinafter, referred to as ADF) 25 for automatically replacing the original on the contact glass 2, and the front and back sides of the transfer material. In order to perform double-sided copying in which toner images are formed on both sides, for example, the back side discharge is performed in which the surface of the transfer material on which the toner image is formed (hereinafter referred to as the toner image surface) faces downward on the discharge tray 24. It is provided with a circulation transport path 33, 30, 31, 32 for carrying out. AD above
As shown in FIG. 2A, F is an original table 40 on which a plurality of originals can be placed, and a calling lever 4 for separating the originals one by one and conveying the originals at correct timing.
1. A transport unit including a calling roller 42, a separating roller 43, and the like, and a transport unit for transporting a document and stopping the document at the document setting position on the contact glass 2 correctly and discharging the document from the contact glass 2 after the scanning of the document is completed. A transport unit including a belt 44, a reversing roller 45, a paper discharging roller 46,
After the reading and scanning is completed, an accommodating portion including an original receiver 47 for accommodating an original conveyed from the contact glass surface 2 is provided. When this ADF is inserted into the original table 40 and then the start key of the copying machine is pressed, the calling lever 41 is lowered to bring the original into close contact with the calling roller 42. Next, a feeding motor (not shown) is activated to rotate the calling roller 42 and the separation roller 43, and the feeding belt 44 is rotated through the rotation of the rollers that follow the feeding roller 42 to feed the original,
It is conveyed onto the contact glass 2 by the conveyor belt 44 and stopped at the document setting position. Thereafter, at the timing of copying, after the scanning is completed, the conveyor belt 44 is rotated, and the reversing roller 45 and the paper discharge roller 46 are rotated to discharge the original onto the original receiver 47. After that, automatically repeat each operation at the timing of copying,
The originals on the original table 40 are sequentially conveyed from the lowermost one.

The above-mentioned circulating transport path switches the path of the transfer material that has passed through the fixing device 22 to the lower part of the machine.
Inversion part 33 including 3a and sponge roller 33b
A double-sided tray section 30 including a double-sided tray 30a and a leading end roller 30b; a double-sided sheet feeding section 31 including a double-sided sheet feeding roller 31a; and a double-sided conveying section 32 including a double-sided conveying roller 32a. There is. In this circulation conveyance path, the path of the transfer material that has passed through the fixing device 22 is switched to the lower part of the machine by the switching claw 33a, the transfer material is sent to the double-sided tray part 30 at the lower part of the machine, and the double-sided tray of the double-sided tray part 30 is switched. Switch back on 30a, and the double-sided paper feeding roller 3 from the trailing edge side of the transfer material in the transport direction up to that time.
The sheet is fed by 1a and is re-conveyed, and the double-sided conveyance roller 32a of the double-sided conveyance unit 32 feeds the transfer material to the surface of the photosensitive drum 1 again with the front and back reversed. When performing double-sided copying, the toner image previously formed on the photosensitive drum 1 as a toner image for the back side is transferred to the transfer material facing the surface of the photosensitive drum 1 through the circulation conveyance path. After that, the paper is ejected directly onto, for example, the paper ejection tray 24 through the fixing device 22. In addition, particularly when performing the back side paper ejection in which the back side of the blank sheet is faced upward on the paper ejection tray 24 without forming a toner image on the back side of the transfer material, the paper is passed through this circulation conveyance path. The transfer material facing the surface of the photoconductor drum 1 is simply passed through the surface facing part of the photoconductor drum 1 on which the toner image is not formed, and then directly discharged onto, for example, the paper discharge tray 24 through the fixing device 22.

Here, after the transfer material on which the image is formed passes through the fixing device 22 and after the toner image is fixed, it is directly discharged onto, for example, the paper discharge tray 24 without passing through the circulation transport paths 33, 30, 31, 32. When the paper is conveyed and is transported normally,
As described above, the transfer material is a surface-side sheet discharged onto the sheet discharge tray 24 with the toner image surface facing upward. On the other hand, the transfer material on the discharge tray 24 when the back surface is discharged through the circulation conveyance path has the toner image surface facing downward. In addition to this, as described above, the double-sided tray The top and bottom of the toner image is reversed from the top and bottom of the toner image on the transfer material on the discharge tray 24 by the normal conveyance because the switch back is performed in the unit 30. Note that, as is well known, such double-sided copying and back surface ejection are modes that are executed by the operator's selection, and a sequence control program for executing the modes is stored in a storage device attached to the CPU. This is executed when the operator presses the mode selection key on the operation panel to select one of these modes.

In a conventional copying machine, when an OHP sheet is used as a transfer material and is copied to an HP sheet, the OHP sheet is replaced with plain paper on a paper feed cassette of a paper feed unit or a manual paper feed tray. In the copying machine according to the present embodiment, the role of the OHP sheet is emphasized and the handling is improved, so that the OHP sheet is set in order to improve the handling. It has an OHP mode that is selected and executed by the operator when copying. The OHP mode will be described below.
In the OHP mode of this embodiment, unlike the normal copying mode in which an electrostatic latent image corresponding to the mirror image of the original image is formed on the photosensitive drum 1, a normal image of the original image is formed on the photosensitive drum 1. Form a corresponding electrostatic latent image. Here, the mirror image of the original image is an image in which the original image and the top and bottom of the image are the same and the left and right are reversed as in the case where the original image is reflected on a mirror, and the normal image of the original image is It is the same image as the original image (naturally, the top and bottom of the image and the left and right sides are the same). In order to form a mirror image of the original on the photosensitive drum 1, the digital image signal obtained by the reading scan is image-processed so that a normal image of the original can be formed, and the optical writing by the laser is controlled. Unlike this example, in a copying machine that is not a digital copying machine, an internal optical system for exposing and exposing reflected light from the original on the photosensitive drum 1 is formed so that a latent image corresponding to a normal image of the original can be formed. Set the mirror etc. The electrostatic latent image thus formed on the photoconductor drum 1 is developed by the developing device 16, and the fed OH
After being transferred onto the P sheet, the toner image is fixed through the fixing device 22, and after passing through a circulation transportation path as necessary as described later, or directly without passing through the path, for example, a paper discharge tray. The paper is ejected onto 24.

As a result, the toner image on the OHP sheet is transferred to the OHP sheet because the electrostatic latent image and the toner image on the photoconductor drum 1 are normal images of the original image. It is the equivalent of a mirror image.
Therefore, the toner image on the OHP sheet is visible from the back surface of the OHP sheet. Since the back surface of a normal OHP sheet has higher smoothness and is uniform and glossy than the surface of an OHP sheet designated as a toner image forming surface as described above, a toner image is formed on the front surface. Compared with the conventional case where the toner image is visually observed from the surface, the image density is high and the image looks high-class.

In the OHP mode, in order to prevent problems due to the close contact of the OHP sheets on the discharge tray 24 and to improve the handleability of the OHP sheets thereafter, and also in the discharge tray 24. OH of each one above
In order to make it easier to recognize the image copied on the P-sheet,
For example, plain paper of the same size as an OHP sheet stored in another paper feeding cassette is fed and conveyed between copying on the OHP sheet, and is fed between the OHP sheets on the paper discharge tray 24. You may make it interpose as paper.

Further, a toner image corresponding to the normal image of the original image to be copied on the OHP sheet may be formed on the plain paper which is the interleaf paper. In this case, the conveyance using the circulation conveyance path and the latent image formation after the image processing of the image rotation processing of 180 degrees at the time of forming the latent image are performed. OHP sheets and slip sheets of
After picking up from the top with overlapping, inverting the whole if necessary, after visually observing it as an upright image of the original with the one located on the upper side turned over,
It is desirable that the object located on the lower side can be visually observed as it is as an erect image of the original without being turned upside down. Hereinafter, this point will be described in detail. In the OHP mode, a toner image corresponding to a mirror image of the original image is formed on the OHP sheet. Therefore, both the OHP sheet and the slip sheet on which the toner image corresponding to the normal image of the original image is formed are conveyed by, for example, normal conveyance. If the paper is discharged onto the paper discharge tray 24, the above visual method cannot be performed, and the handling becomes complicated. For example, when the OHP sheet is discharged onto the discharge tray 24 and then the interleaf sheet on which the toner image of the same original image is formed is discharged, the stack sheet is picked up from the discharge tray 24 while being piled up. To visually check the toner image on the interleaving paper as an upright normal image of the developed image and turn it over, and then visually check the toner image of the OHP sheet located on the lower side as a normal image of the original image from the back surface of the OHP sheet, use the OHP sheet. Need to be reversed. On the contrary, after picking up the paper from the discharge tray 24 with the whole overlapped and reversing the whole, the toner images on the OHP sheets are visually observed as an upright normal image of the original image from the back surface of the OHP sheets with the toner images overlapped. After flipping over, it is necessary to reverse the slip sheet in order to see the toner image of the slip sheet located on the lower side from the surface of the slip sheet. Therefore, the OHP sheet and the interleaf sheet on which the same original image is copied are picked up from the discharge tray 24 while being overlapped, and the whole is inverted, if necessary, and then the toner image of the upper side is still overlapped. In order to make it possible to visually check as an erect image of the original image and flip it over, then to make it possible to visually see the original image as it is (not necessarily the erect image) of the original image without reversing the front and back. Then, one of the OHP sheets and the interleaf sheet on which the same original image is copied is ejected by normal conveyance so that one of the toner image surfaces faces upward and the other faces downward. Paper is printed, and the other one is discharged on the back side through the circulation transport path. As for the other one, since the top and bottom of the image in the transport direction is reversed by the switchback in the double-sided tray section 30 as described above because it passes through the circulation transport path, the toner image of the one located above is reversed. After observing as an erect image of the original image in the state of overlapping, turn over this so that you can visually see the original image as the erect image of the original image without inverting the front and back In order to do so, the toner image of either the OHP sheet or the interleaving paper is formed by rotating 180 degrees. For this reason, the latent image formation is performed after the image processing of the image rotation processing of 180 degrees at the time of forming the latent image as described above. As described above, in addition to copying the normal image of the original image on the transfer material by a normal copying method, when copying a 180 ° rotated image of the original image on the transfer material, a mirror image of the original image is copied. In some cases, a mirror image of a document image and a 180 ° rotated image may be copied. An example of the toner image on these transfer materials is shown in FIG. Figure 3
(A) to (d) respectively show an original image (original) and a toner image (copy) on a transfer material.
Is a normal copy, and (b) is a copy of the original image on the transfer material.
When copying a 0-degree rotated image, (c) shows a case where a mirror image of an original image is copied onto a transfer material, and (d) shows a case where a mirror image of an original image and a 180-degree rotated image is copied onto a transfer material. ing.

The operation of feeding and transporting plain paper between OHP sheets during copying and interposing them as interleaving paper between the OHP sheets on the discharge tray 24 is performed by the operator.
When the mode is selected, it may be possible to select whether or not to carry such interleaving paper.
In the mode, it may be set so that the conveyance of such interleaving paper is inevitably performed. Further, as shown in FIG. 4, an interleaf sheet mode selection key 61 and display portions 61a and 61b for displaying the selection state are provided on the operation panel to determine whether or not to interleave the interleaf sheet, and further to deliver the interleaf sheet. In this case, the operator may also select whether or not to copy the same original image as the OHP sheet on the slip sheet. In Fig. 4, OHP mode selection key 6
2 and the display units 62a and 62b for displaying the selection state,
This is for selecting whether or not to select the OHP mode. O
When the HP mode is selected, the display portion 62a displayed as a mirror image lights up, and when not selected, the display portion 62a displayed as normal lights up. Here, whether or not to select the sheet feeding from the sheet feeding cassette in which the OHP sheet is accommodated by the selection key 62 and whether to execute the OHP mode when the sheet feeding from the cassette is selected. Or, a normal toner image of the original image is OHP
You may make it select whether to form on a sheet.
Paper ejection selection key 63 and display section 63 for displaying the selection state
Reference characters a and 63b are provided to allow the operator to select the discharge surface of the transfer material.

Below, for example, on the operation panel as shown in FIG. 4, whether or not the image of the original image is copied onto the slip sheet (by the selection key 61), whether the image on the OHP sheet is the normal image of the original image or not. Whether it is a mirror image (by the selection key 62), and
A specific example of the copy operation in the case where it is possible to select whether the OHP sheet is to be discharged to the front surface or the rear surface (using the selection key 63) will be described. [Specific Example 1] The interleaf paper copy is selected with the selection key 61,
When the OHP original image mirror image formation is selected by the selection key 62 and the OHP sheet surface discharge is selected, first, the OH
The P sheet is fed, a mirror image of the original image and a 180 ° rotated image are formed on the OHP sheet, the toner image is fixed by the fixing device 22, and the sheet is discharged onto the discharge tray 24. Next, a transfer sheet (for example, plain sheet) serving as an interleaf sheet is fed, a normal image is copied with the same original image as the OHP sheet, an image is formed, and after fixing, the sheet is discharged through the circulation conveyance path to the sheet discharge tray 24. The paper is ejected on the back side. As a result, on the discharge tray 24, as shown in FIG. 5A, the document image is inverted on the lower surface on the OHP sheet on which the image of the inverted mirror image of the document image is formed on the upper surface (hereinafter, in normal copying operation). Output tray 24
The upside down of the toner image on the transfer material is upright and the upside down is upside down.)
The interleaving paper on which the normal image is formed is stacked and stacked. If this is picked up from the paper discharge tray 24 as it is, and the image of the OHP sheet is visually observed from the back side of the OHP sheet as an erect normal image of the original image, if it is turned over, the image on the interleaf paper is directly changed to the erect normal image of the original image. You can see it. This example is an OHP mode in which an inverted mirror image of an original image is formed as a toner image on an OHP sheet, and the image on the interleaf sheet is a normal image, interleaf sheet feed after the OHP sheet, front sheet ejection of the OHP sheet, interleaf sheet. The image forming operation is a combination of the four conditions of the back side paper discharge of the above. However, when the conditions and are determined, the conditions are inevitably determined. Therefore, the conditions and are selected by the operator and At the stage determined by the setting of the machine, the condition is automatically determined regardless of the operator's selection.

[Specific Example 2] When the interleaf paper copy is selected by the selection key 61, the OHC original image mirror image formation is selected by the selection key 62, and the OHP sheet rear surface discharge is selected, the interleaf paper is first selected. The following transfer paper is fed, normal copying is performed, and after the toner image is fixed, the surface is discharged onto the discharge tray 24. Next, an OHP sheet is fed, a mirror image of the same original image as that of the interleaf sheet and a 180 ° rotated image are formed on the OHP sheet, and after fixing the toner image, it passes through the circulation conveyance path and onto the discharge tray 24. The paper is ejected. As a result, the discharge tray 2
As shown in FIG. 5B, the OHP sheets having the erecting mirror image of the original image formed on the lower surface are stacked and stacked on the interleaving paper having the image of the erecting erect image of the original image formed on the upper surface. To be done.
Pick this up from the output tray 24 as it is,
By visually observing the image of the OHP sheet as an erect image of the original image from the back side of the P sheet and turning it over, the image on the interleaving paper can be visually observed as it is as the erect image of the original image.
In this example, one of the original images is used as the toner image on the OHP sheet.
In the OHP mode of forming an 80-degree rotating mirror image, the image on the interleaving paper is a normal image, the OHP sheet feeding after the interleaving paper,
4 sheets called OHP sheet back side ejection and interleaf sheet front side ejection
The image forming operation is a combination of three conditions. Among these conditions, when the conditions and are determined, the conditions are necessarily determined. Therefore, the conditions and are determined by the selection by the operator and the setting of the machine. At this stage, the conditions are automatically determined regardless of the operator's selection.

[Specific Example 3] Similar to Specific Example 1, in this example, the interleaf paper copy is selected by the selection key 61, the OHP original image mirror image formation is selected by the selection key 62, and the OHP is performed.
This is the case where the sheet surface discharge is selected. In this example, the machine setting of OHP original image mirror image formation is 1 for the original image.
The difference is that it is a non-rotating normal image instead of an 80 ° normal image. First, an OHP sheet is fed to form a mirror image of a document image, and after the toner image is fixed, the surface of the sheet is discharged onto the discharge tray 24. Next, a slip sheet is fed, a 180 ° rotated image of the same original image as that of the OHP sheet is formed, and after the toner image is fixed, the reverse side is discharged onto the discharge tray 24. As a result, on the discharge tray 24, as shown in FIG. 5C, the erect normal image of the original image is formed on the lower surface of the OHP sheet on which the image of the erect mirror image of the original image is formed. The slip sheets are stacked and stacked. If this is picked up from the discharge tray 24 as it is, and the image of the OHP sheet is visually observed from the back side of the OHP sheet as an erect normal image of the original image, it is turned over.
The image on the slip sheet can be visually observed as it is as an upright image of the original image.

[Specific Example 4] In this example, similarly to the specific example 2, the selection key 61 selects interleaf paper copy, the selection key 62 selects OHP original image mirror image formation, and OHP.
This is a case where the sheet surface discharge is selected, but in this example, the machine setting for forming the OHP original image mirror image is different from the non-rotation normal image of the original image to the 180-degree rotation normal image. First, a transfer sheet, which is an interleaf sheet, is fed, a 180 ° rotated image is formed, and after the toner image is fixed, the sheet is discharged onto the discharge tray 24 on the surface. Next, an OHP sheet is fed to form a mirror image image of the same original image as the slip sheet, and after the toner image is fixed, the sheet is ejected on the back side onto the ejection tray 24. As a result, on the discharge tray 24, as shown in FIG. 5D, an OHP sheet on which an inverted mirror image of the original image is formed on the lower surface of the interleaf paper on which an image of the inverted normal image of the original image is formed on the upper surface. Are stacked and loaded. If this is picked up from the paper discharge tray 24 as it is, and the image of the OHP sheet is visually observed from the back side of the OHP sheet as an erect normal image of the original image, if it is turned over, the image on the interleaf paper is directly changed to the erect normal image of the original image. You can see it.

Next, control in the case where a plurality of documents are conveyed by the ADF and a mirror image of the document image is continuously formed on the OPC sheet will be described. Normally, when a document is automatically replaced by using the ADF, the discharge surface is set so that the copies on the discharge tray 24 are lined up in the page order of the document set on the document table 40 of the ADF. . For example, as schematically shown in FIG. 6B, the document surface to be copied on the document table 40 of the ADF is faced up (P1 is the first page of the document, P2 is the second page of the document). Eye manuscript, P
Reference numeral 3 indicates the original on the third page. 6 (a), 7 (a),
The same applies to FIG. 7 (b). ) Is set, and the original surface having the lowest number of pages (the original on the third page in the illustrated example) is conveyed onto the contact glass 2 and read on the original receiver after the original is read. To discharge,
After that, when a document having a small number of pages is sequentially read and a copy is formed in this reading order, the first copy is made on the discharge tray 24 (in the figure, C1 is the first copy, and C2 is the first copy). The copy of the second page, C3 shows the copy of the third page. The same applies to FIGS. 6 (a), 7 (a), and 7 (b)). After the copies are ejected, the copies of the originals having a small number of pages are sequentially stacked and ejected. Therefore, the ejection surface is set on the front side so that the copies on the ejection tray 24 are arranged in the order of the pages of the originals. To be done. On the contrary, as shown in FIG. 7B, the original is set on the original table 40 of the ADF with the surface of the original to be faced down, and the lowest number of pages is the minimum, that is, the first page of the original. From the contact glass 2 to the contact glass 2 and discharges the read document face down on the document receiver after reading the document, and sequentially reads the document having a large number of pages, and forms a copy in this reading order. In the case of (1), after the first copy of the original document on which the copy is first formed is discharged onto the discharge tray 24, the copies of the original document with a large number of pages are sequentially stacked and discharged. The discharge surface is set to the back so that the copies on the paper tray 24 are arranged in the page order of the original. That is, in the case of starting from the copy of the document of the last page, sequentially forming the copy of the document with the smaller number of pages and sequentially stacking them on the discharge tray 24, it is set to the front surface discharge and the reverse. In the case of starting the copying of the original of the first page, sequentially forming the copies of the original having a large number of pages, and sequentially stacking them on the discharge tray 24, the back side discharge is set. .

However, in the present invention, the toner image on the OHP sheet is a mirror image of the original image, and the toner image is seen from the back surface which is the surface opposite to the toner surface.
For example, the copy on the discharge tray 24 shown in each of FIGS.
You will see the toner image on the sheet. Therefore, if the discharge side is set as usual, when the OHP sheet is viewed from the back side, the OHP sheets on the discharge tray 24 are in the reverse order of the original page order (in the illustrated example, the third page , Second page,
It will be arranged in the order of the first page). Therefore,
In the present embodiment, when copies of a plurality of original images are continuously formed on the OHP sheet, the setting is the reverse of the normal setting of the discharge surface. That is, in the case where the copy of the original of the last page is started, the copy of the original with a smaller number of pages is sequentially formed, and the copies are sequentially stacked on the discharge tray 24, the reverse-side discharge is set and the reverse is set. In the case of starting the copying of the original of the first page, sequentially forming the copies of the original with a large number of pages, and sequentially stacking them on the discharge tray 24, the front-side discharge is set. For example, in the case of the ADF and copy creation order as shown in FIG. 6B, as shown in FIG. 6A, the OHP sheet is turned over through the circulation transport path and then discarded on the discharged toner. In the case of discharging the back side and in the case of ADF and copy creation order as shown in FIG. 7B, as shown in FIG. 7A, the OHP sheet is directly placed on the discharge tray 24 without passing through the circulation transport path. The paper is ejected to the front and ejected to the front.

[0021]

According to the invention of claim 1, a latent image corresponding to a normal image of an original image is formed on a latent image carrier, and the developed image obtained by developing the latent image is transferred onto an OHP sheet. , By this, OH
Since the developed image on the P sheet is viewed from the surface opposite to the developed image surface of the OHP sheet, which has smoothness and is uniform and glossy as compared with the developed image surface of the OHP sheet, the toner image is formed from the developed image surface. As compared with the conventional case where the image is visually observed, there is an excellent effect that the image density is high and the image looks high-class. Further, when an OHP sheet is projected by a projector (OHP), for example, in the case of drawings or graphs, it is often designated by a pointing rod or the like. Therefore, in the case of the conventional copying, the image stick may directly hit the image surface and the image may be missing.However, in the present invention, the back side of the image forming surface is the front side, and thus such image missing may occur. It can be prevented. According to the second aspect of the present invention, the OHP image forming operation and the interleaf paper image forming operation are executed for one original image, whereby the image of each original image is formed between the OHP sheets on which the images of each original image are formed. Since the interleaving paper on which is formed is automatically inserted and stacked on the output tray,
OHP sheets do not come into close contact with each other on the discharge tray, and classification of OHP sheets on which images are formed becomes easy. The invention according to claim 3, 4, 5 or 6 provides the above predetermined O
The HP image forming operation and the interleaf paper image forming operation are executed, whereby the OHP is discharged and stacked on the discharge tray.
Since the top and bottom of the image on the sheet and the image on the interleaf sheet are made to coincide with each other, for example, when an OHP sheet is projected by OHP, the image formed on the OHP sheet and the interleaf sheet are the same, and therefore the image is projected on the OHP. You can easily check the image you are doing. Further, when picking up the OHP sheet and the slip sheet on the paper discharge tray and visually observing the developed image as a normal image of the original image, the order of the formed images is from the direction in which the OHP sheet is visually observed, Since the sheets are overlapped in the order of the slip sheets, it is extremely easy to confirm them at hand. The invention according to claim 7 or 8 executes the above-mentioned predetermined OHP image forming operation and interleaving paper image forming operation, whereby the OHP sheet on which the image has been formed is oriented in a direction in which the developed image is viewed as a normal image of the original image. Since the sheets are discharged and stacked on the sheet discharge tray so as to be arranged in the order of pages of the images, it is possible to improve the handleability of the OHP sheet after the image formation.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a digital copying machine according to an embodiment.

2A is a schematic configuration diagram of an ADF of the copying machine, FIG.
FIG. 3B is a schematic configuration diagram of a circulation transport unit of the copying machine.

FIG. 3A to FIG. 3D are explanatory diagrams each illustrating a toner image formation pattern on a transfer material.

FIG. 4 is a front view showing a part of an operation panel of the copying machine.

FIGS. 5A to 5D are explanatory views for explaining image forming patterns in a mode in which interleaving paper is inserted between OHP sheets.

FIG. 6A is an explanatory diagram for explaining OHP sheet discharge surface control when an ADF is used in the copying machine;
(B) is an explanatory view for explaining a paper discharge surface control in a conventional copying machine using an ADF similar to the copying machine.

FIG. 7 (a) shows O when an ADF according to a modification is used.
Explanatory drawing for demonstrating HP sheet discharge surface control, (b)
FIG. 4 is an explanatory diagram for explaining a discharge surface control in a conventional copying machine using the same ADF.

[Explanation of symbols]

1 photoconductor drum, 2 contact glass 7 fixing device, 25 A
DF 30 double-sided tray section, 31 double-sided paper feeding section 32 double-sided transport section, 33 reversing section 40 document table, 47 document receiver 33, 16 19, 20 20a, 22

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 1/29 H 9186-5C

Claims (8)

[Claims] 1. An image forming method comprising: forming a latent image corresponding to a normal image of an original image on a latent image carrier, and developing the latent image to transfer the developed image onto an OHP sheet. Method. 2. The images of a plurality of original images are sequentially OHP.
In an image forming apparatus having a mode of forming on a sheet, in the mode, a latent image corresponding to a normal image of the original image is formed on a latent image carrier for one original image,
An OHP image forming operation of transferring the developed image obtained by developing the latent image onto an OHP sheet and discharging the OHP sheet onto which the developed image is transferred onto a discharge tray, and an original document on the latent image carrier. Form a latent image corresponding to the mirror image of the image,
A control means is provided for transferring a developed image obtained by developing the latent image onto an opaque transfer material and performing an interleaf image forming operation of discharging the transfer material onto a paper discharge tray. An image forming apparatus characterized by. 3. A normal conveying part for discharging the transfer material onto the discharge tray so that the developed image surface of the transfer material faces upward, and a discharge tray on which the developed image surface of the transfer material faces downward and the discharge tray. A top and bottom position of the developed image on the discharge tray in the case where the top and bottom position of the developed image is conveyed by the normal conveying unit, As the OHP image forming operation, the control means sets the latent image formation to the original image 1
After the latent image corresponding to the mirror image rotated by 80 degrees is formed, and the paper discharge onto the paper discharge tray is the paper discharge at the normal transport unit, the interleaf paper image forming operation is performed. A latent image forming operation is a latent image forming operation corresponding to a normal image of a document image, and an operation of discharging a sheet onto a sheet discharging tray is a sheet discharging operation in the reversing conveyance section. The image forming apparatus according to item 2. 4. A normal conveying section for discharging the transfer material onto the discharge tray so that the developed image surface of the transfer material faces upward, and a discharge tray on which the developed image surface of the transfer material faces downward and the discharge tray. A top and bottom position of the developed image on the discharge tray in the case where the top and bottom position of the developed image is conveyed by the normal conveying unit, The control means, as the interleaf image forming operation, forms a latent image corresponding to a normal image of a document image in the latent image formation, and discharges the sheet onto the sheet discharge tray in the normal conveyance section. After the above operation is performed, the latent image formation is the original image 1 as the OHP image formation operation.
3. The image according to claim 2, wherein the latent image corresponding to the mirror image rotated by 80 degrees is formed, and the operation of discharging the sheet onto the sheet discharge tray is the sheet discharge in the reverse conveying unit. Forming equipment. 5. A normal conveying section for discharging the transfer material onto the discharge tray such that the developed image surface of the transfer material faces upward, and a discharge tray on which the developed image surface of the transfer material faces downward and the discharge tray. A top and bottom position of the developed image on the discharge tray in the case where the top and bottom position of the developed image is conveyed by the normal conveying unit, As the OHP image forming operation, the control means forms a latent image corresponding to a mirror image of an original image as the OHP image forming operation, and discharges a sheet onto a sheet discharge tray is a sheet discharge in the normal conveying section. After the operation is performed, as the above-mentioned interleaf paper image forming operation, the latent image formation is the original image 18
3. The operation according to claim 2, wherein the latent image corresponding to the normal image rotated by 0 degrees is formed, and the discharge onto the discharge tray is the discharge at the reverse conveying unit. Image forming apparatus. 6. A normal conveying section for discharging the transfer material onto the discharge tray such that the developed image surface of the transfer material faces upward, and a discharge tray on which the developed image surface of the transfer material faces downward and the discharge tray. A top and bottom position of the developed image on the discharge tray in the case where the top and bottom position of the developed image is conveyed by the normal conveying unit, In the interleaf paper image forming operation, the control means sets the latent image formation to the original image 18
After the operation of forming a latent image corresponding to a normal image rotated by 0 degree and discharging the paper onto the paper discharge tray is the paper discharge in the normal transport unit, the OHP image forming operation is performed as follows. The latent image formation is a formation of a latent image corresponding to a mirror image of an original image, and the paper discharge onto the paper discharge tray is a paper discharge at the reversing conveyance unit. 2 image forming apparatus. 7. A normal transport unit for discharging the transfer material onto the discharge tray so that the developed image surface of the transfer material faces upward, and a discharge unit such that the developed image surface of the transfer material faces downward on the discharge tray. A reverse conveying unit for paper, and starts from the image formation of the document image of the last page among the plurality of document images, and sequentially prints the image of the document image of pages with a smaller number of pages on the transfer material. In an image forming apparatus having a mode of sequentially forming and stacking on a paper discharge tray, in this mode, when an OHP sheet is selected as a transfer material, a normal image of the original image is formed on the latent image carrier. A corresponding latent image is formed, the developed image obtained by developing the latent image is transferred onto an OHP sheet, and the OHP sheet onto which the developed image is transferred is conveyed by the normal conveying section and onto the discharge tray. The provision of control means for executing the OHP image forming operation for discharging the paper. An image forming apparatus symptoms. 8. A normal transport unit for discharging the transfer material on the discharge tray so that the developed image surface of the transfer material faces upward, and a discharge unit for discharging the developed image surface of the transfer material on the discharge tray so as to face downward. A reverse conveying unit for paper, and starting from the image formation of the original image of the first page among the plurality of original images, sequentially forming the images of the original images of the pages having a large number of pages on the transfer material. In an image forming apparatus having a mode of sequentially forming and stacking on a paper discharge tray, in this mode, when an OHP sheet is selected as a transfer material, a normal image of the original image is formed on the latent image carrier. A corresponding latent image is formed, the developed image obtained by developing the latent image is transferred onto an OHP sheet, and the OHP sheet onto which the developed image is transferred is conveyed by the reversing conveyance unit and onto the discharge tray. The provision of control means for executing the OHP image forming operation for discharging the paper. An image forming apparatus symptoms.