JPH05113706A - Composite image forming method - Google Patents

Abstract

PURPOSE:To perform composite editing efficiently only by exposure in turn with no change added to the document itself by effacing the unrequired part of a first document image before transferring the first document image onto a photocopied sheet, and transferring a second document image onto the space part formed by effacement. CONSTITUTION:The image S2 (oblique line part) of a second document is transferred to a space part S1 in the image (oblique line part) of a first document transferred onto a photocopied sheet. That is, light is applied to the copying-unrequired region S1 of the first document image and the part excluding the copying-required region S2 of the second document in an electrostatic latent image forming process so as to efface the latent images of the unnecessary image parts. Regarding the photocopied sheet moving direction dislocation Y and the photocopied sheet width direction dislocation X between the space part S1 and the image part S2, the photocopied sheet supporting body of a transfer means is operated before the exposed latent image formation of the second document so as to move the photocopied sheet placed in the chain line position P into the continuous line position. The image part S2 is thus brought in line with the space part S1 to perform multiple copying.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite image forming method in which required image portions of two or more originals are composite-edited on one copy sheet according to a desired arrangement.

[0002]

2. Description of the Related Art A transfer type electrophotographic method is used to synthesize and edit desired image portions of two or more originals on one copy sheet according to a desired arrangement. It is possible to obtain a composite image by cutting out the portions of the original that require copying, bending the unnecessary portions or covering them with a mask member, and arranging and exposing the image portions of these portions in a spliced state.

[0003]

However, the above method is
Not only is it not practical, but it cannot be applied depending on the book or other manuscript.

According to the present invention, a transfer type electrophotographic copying machine is used, and a composite image forming method for efficiently performing the above-described composite editing by simply exposing the manuscript in order without any modification is obtained. The purpose is to

[0005]

The present invention is a composite image forming method having the following points.

(1) In an image forming system in which an electrostatic latent image is formed on a photosensitive member by a combination of charging and exposure and the latent image is developed and transferred, in order to synthesize and edit two or more original images, A composite image forming method characterized by erasing an unnecessary portion of a document image before transferring one document image to a copy sheet and transferring the second document image to a blank portion formed on the copy sheet by the erasing. ..

(2) The composite image forming method according to (1), wherein an unnecessary portion of the second original image is erased before being transferred to a copy sheet.

(3) In the step of forming a latent image on a photosensitive member, the latent image erasing light is projected to erase an unnecessary portion of the original image, and the image composition according to (1) or (2) is characterized. Method.

(4) When the blank portion in the first original image on the copy paper does not match the copy portion of the second original image, the copy paper support of the transfer means is moved before the formation of the exposure latent image of the second original. Then, the copy section is matched with the blank section, and the copy paper support is fixed at the matching position, and the image synthesizing method according to (1).

[0010]

That is, the required image portions of two or more originals are combined and edited on one copy sheet according to a desired arrangement by using the transfer type electrophotographic method.

As shown in FIG. 1, the first image transferred to the copy paper
This is due to the multiple transfer means for transferring the required image portion S2 (hatched portion) of the second document to the blank portion S1 in the image (hatched portion) of the document.

The image portion S1 which does not require the copying of the first original for forming the blank portion S1 and the image portion other than the image portion S2 which requires the copying of the second original are fixed to the photoreceptor. The latent image in the unnecessary image portion is erased by applying light in the process of forming the latent image.

Further, as shown in FIG. 2, a blank portion S1 and an image portion S2
The deviation Y in the direction of movement of the copy paper and the deviation X in the width direction of the copy paper perpendicular to that direction are shown in FIG. 3 by operating the copy paper support of the transfer means before the formation of the exposure latent image of the second original. The copy sheet at the chain line position P is moved to the position indicated by the solid line to align the image portion S2 with the blank portion S1 for multiple transfer.

[0014]

Embodiments of the method of the present invention will be described in detail below by taking an electrophotographic copying machine adopting a slit exposure system as an example.

In FIG. 4, reference numeral 1 denotes a photosensitive drum. As an example, if the latent image forming process described in Japanese Patent Publication No. 42-23910 by the present applicant is applied, the photosensitive drum 1 is a conductive substrate, CdS or the like. Is a photoconductor having a three-layer structure including a photoconductive layer and an insulating thin layer. The photosensitive drum 1 rotates in the direction of the arrow in response to a copy operation command, is positively charged by the primary charger 2, and then the document image irradiated by the illumination lamp 4 is slit-exposed by the exposure unit 3. Simultaneously with this exposure, the AC corona discharger 5 removes the charge. Next, the whole surface is exposed by the whole surface exposure lamp 6, and a latent image having a high electrostatic contrast is formed on the drum 1.

The image of the original 8 placed on the original table 7 is composed of the reflection mirrors 9 and 10, the lens 11, and the reflection mirrors 12 and 13.
An image is formed on the photosensitive drum via the optical system of. In the case of the movable optical system, the speed ratio of the illumination lamp 4, the scanning mirror 9 and the second scanning mirror 10 is set to 2: 1 so that the optical path length between the lens 11 and the document is always kept constant. However, there is also a case where the platen is moved. 14 is a developing device, 15 is a photoconductor cleaner,
16 is a corona discharger for static elimination.

Reference numeral 17 is a transfer drum which is mounted in parallel with the photosensitive drum 1, and 18 is a copy paper gripper provided on the transfer drum 17. The copy paper P in the cassette 19 is fed by the paper feed roller 20 via the guide 21 and is gripped by the gripper 18. The transfer drum 17 is driven separately from the photosensitive drum 1 by the motor 38 and rotates at the same peripheral speed as the drum 1 in the opposite direction. The latent image position on the photosensitive drum and the copy paper P are synchronized with each other. Reference numeral 22 is a scale line for setting the position of the copy paper, and 23 is a transfer corona discharger.

After the transfer process is completed, the transfer drum 17 is screw-fed to the copy material separating position by the motor 34, separated by the separating claws, and transferred to the fixing process section.

In the electrophotographic copying machine as described above, one cycle until the transfer process for the first original is completed, and then the original image of the second original is transferred onto the same copy paper. Repeat multiple copies for the number of originals. At that time, in order to erase the latent image of the original image other than the portion S1 for the first original and the portion S2 for the second original, the flying spot emitted by the rotation of the polygon mirror 25 from the laser source 24 is changed. It is projected on the latent image on the photosensitive drum 1. As the flying spot, a light spot between browns or an electron beam may be used.

In order to select the necessary area of the original image for erasing the inside of S1 of the first original and the portion other than S2 of the second original, movable indicators are provided on the rails 28 and 29 in the vertical and horizontal directions of the original table 7. 26a and 26b and 27a and 27b are provided, and these are aligned with the selected area of the original placed on the original table 7 in accordance with the reference position, signals are extracted from each index, and the laser source 24 is controlled by an electronic circuit to enable multi-sided operation. A known monitor mechanism is used to rotate the mirror 25 (see, for example, Japanese Patent Application Laid-Open No. Sho 5 of the present applicant.
No. 4-115253).

Next, the deviations X and Y of the image portion S2 of the second original with respect to the blank portion S1 formed on the copy paper are caused by the photosensitive drum 1.
The position of the copy paper P is moved with respect to the upper latent image position before the exposure scanning of the second document is started to perform the alignment. For that purpose, as shown in FIG.
a and 31b are provided movably along rails 32 and 33, respectively.

The displacement X is set by the indexes 30a and 30b, and the signal from the index is used to rotate the motor 34 through the electronic control circuit to cause the feed screw 35 to move the bearing support base 36 of the transfer drum 17 to the sliding guide member 37. Along the drum 17
Is moved in the axial direction until the displacement X becomes zero and stopped.

Further, the deviation Y is set by the indexes 31a and 31b, the motor 38 is rotated by the signal from the index via the electronic control circuit, and the transfer drum 17 is operated via the gears 39 and 40.
Is rotated, and in the case of the figure, the copy paper P is stopped at the position advanced by Y.

In this way, after the deviation X / Y of the image of the second original with respect to the transferred image of the first original on the copy paper is corrected, the exposure scanning of the second original is performed, so that the blank area as shown in FIG. The image S2 is transferred to S1 to obtain a composite edited image. The same procedure applies to multiple transfer of three or more originals.

The axial movement mechanism of the transfer drum 17 is
It is necessary to surely stop and fix after alignment. For example, if the resolution is 5 lines / mm, the fine movement error must be suppressed to 0.1 mm or less. Therefore, a means for releasing the fixing means after the completion of the first transfer step and fixing it for the second transfer step after alignment is required.

An embodiment of the fixing means is shown in FIGS. FIG. 5 shows a transfer drum support table with a 36 lever 41 and a shaft 42.
Mounted on the sliding guide member 37.
Facing each other and the spring hook 4 provided on the lever 41 and the support base 36.
The tension of the tension spring 44 applied to the
In the case shown in the drawing, the cam portion 41a is pulled in the clockwise direction to loosen the abutment of the cam portion 41a with respect to the slide guide member 37, thereby allowing the transfer drum 17 to move axially.

At the end of the alignment of the axial displacement X, for example, the solenoid 45 is energized by a stop signal of the motor 34,
The lever 41 is rotated via the plunger 45a and the link 46 to press the cam portion 41a against the guide member 37 to fix the transfer drum 17. It is released by cutting off the energization of the solenoid 45 by the transfer process end signal.

In FIG. 6, members 411, 441 and 451 corresponding to the lever 41, spring 44, solenoid 45 and the like of FIG. 5 are provided on the copying machine main body side, and the cam portion 41a1 thereof projects from the transfer drum bearing support 36. It is the structure facing the row 36a. During normal times, the support pedestal 36 is operated by the action of the spring 441.
Is released and is fixed when the solenoid 451 is energized.
In the case of the drawing, the protrusion 36a is sandwiched between a pair of cam portions.

FIG. 7 shows that when the electromagnetic attraction mechanism 47 is attached to the transfer drum bearing support 36 and the coil is energized,
The lines of magnetic force act on the guide member 37 made of a magnetic material, and the support base 3
6 is fixed to the member 37 by suction.

[0030]

As described above, according to the present invention, the original to be combined is directly exposed on the photosensitive member and a plurality of composite edits are performed by multiple transfer, and a series of steps for the composite edit is automated. Conventionally, a method of converting a plurality of manuscript images into an electric signal by using a solid-state image forming element and editing the same, and reproducing the synthesized and edited manuscript image by modulating flying spots and the like by the edited electric signal. Although devised, it requires a large-capacity memory circuit, resulting in a complicated and expensive structure.

The present invention has the effect that a conventional electrophotographic copying machine can be used to obtain a composite image with a simple structure as described above.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of how to combine two images.

FIG. 2 is an explanatory diagram of a synthesis procedure of two images.

FIG. 3 is an explanatory diagram of how to combine two images.

FIG. 4 is a perspective view of an essential part of an apparatus for carrying out the method of the present invention.

FIG. 5 is a front view showing a transfer drum fixing and releasing mechanism.

FIG. 6 is a side view of another embodiment of the mechanism.

FIG. 7 is a front view of still another embodiment of the mechanism.

[Explanation of symbols]

 P Copy paper S1 Blank area of transfer image S2 Transfer image area of another document

Claims (4)

[Claims] 1. An image forming system in which an electrostatic latent image is formed on a photosensitive member by a combination of charging and exposure, and the latent image is developed and transferred. A composite image forming method, comprising: erasing an unnecessary portion of a document image before transferring the document image to a copy sheet, and transferring the second document image to a blank portion formed on the copy sheet by the erasing. 2. Before transferring the second original image onto a copy sheet,
The synthetic image forming method according to claim 1, wherein an unnecessary portion of the original image is erased. 3. The image synthesizing method according to claim 1, wherein in the step of forming a latent image on the photoconductor, an unnecessary portion of the original image is erased by projecting latent image erasing light. 4. When the blank portion in the first original image on the copy paper does not match the copy portion of the second original image, the copy paper support of the transfer means is moved in advance before the formation of the exposure latent image of the second original. 2. The image synthesizing method according to claim 1, wherein the copy portion is aligned with the blank portion and the copy paper support is fixed at the matching position.