JPS5843479A - Copying machine by contact exposure - Google Patents

Abstract

PURPOSE:To inspect plates easily, surely and quickly by exposing the transparent original in a home position through a slit on a photosensitive belt while bringing the same in tight contact with said belt by means of press contacting rolls of a contact exposure device. CONSTITUTION:When a transparent original 6 is placed on a moving original plate 4, and the preceiding end of the original 6 is fixed by means of a pin bar 8 of a stationary original plate 7, the original 6 is set always in a home position by every plate examination. When a contact exposure device 9 is moved together with the plate 4, the original 6 is brought into uniform contact with a photosensitive belt 5 by conductive press contacting rolls 1, 2 of the device 9, and the original is exposed to the belt through a slit by an exposure lamp 3. Here, static electricity is removed by the rollers 1, 2, whereby the disturbance in the electrostatic latent images formed on the belt 5 is obviated, and the original 6 is separated surely. The latent images on the belt 5 which has no possibility for touching by hand is subjected to developing, transferring, fixing, etc., whereby the plates of various colors are inspected easily, surely and quickly by automatic contact exposure, specified origial positions, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses an electrophotographic method to make originals from a resolution mesh positive film, and uses a contact exposure method to eliminate (1)
1 Mistakes related to name (2) Mistakes due to new reprinting (3) Change of flat mesh (crossing) color 1. Mistakes in unifying the mark (4) Mistakes related to pasting (5) Mistakes in pattern correction, (6) Scratches, pinholes, stains, and correction mistakes (7) Mistakes in peeling off the film pasting, etc.

Of the above-mentioned error causes, (11) Name-related mistakes (2) Mistakes due to new reprinting (3) Flat mesh (crossing) color changes and mark unification mistakes (4) Pasting-related mistakes (5) )
This is related to a close-contact optical multi-force aircraft for the purpose of eliminating errors such as peeling off of the film.

Conventional 1. In case of offset mark @1j on flyers etc., calibration e
11 is submitted to the client, and a judgment is made as to whether or not it matches the client's requirements.At that point, points of dissatisfaction and corrections are pointed out, and the disassembled network positive result is corrected. In case of major corrections, proofread 1 it using the corrected decomposition film.
Create a lj, submit it to the customer again, and have it checked.

In the case of partial corrections (which is the case in most cases), in other words, if the film is valuable, the corrected halftone positive film should be blueprinted (on sheer paper) to see if it has been corrected, and the internal fJ , ask person s to confirm. In this case, the complicated thing is that when there is a combination of multiple colors in the corrected area, you have to compare the blueprints of each color, and for example, for the purple part, you have to inspect the blueprint of the eye version and the blueprint of the red version. Must be. Also, when correcting a certain part to green, it must be confirmed that the pattern exists only in the eye version and the clear version, and that the pattern does not exist in the red version and the black version.

As mentioned above, the current plate inspection work is very complicated and cannot be relied on by experienced people. Moreover, it is a very time-consuming process.

The present invention was developed to eliminate the above-mentioned complexity and inefficiency, and by using the contact exposure copying machine of the present invention, even an unskilled person can easily and efficiently perform plate inspection work. 1 In electrophotography, there are two methods of exposure: exposure through a lens system and contact exposure.
The method of exposure at an angle has problems in that the image becomes unclear due to lens aberration and the color of the original, and dimensional accuracy decreases.

According to the contact exposure method, a transparent original is used for contact exposure to directly reproduce a copy, but the reproduction is faithful to the original and has good accuracy.

The present invention consists of the following configuration. That is, a charging device that charges a photosensitive belt provided with a photoconductive and electrical layer, a movable original holder maintained at a constant distance from the photosensitive belt, a fixed original holder equipped with a pin bar, and a transmissive original fixed to the pin bar of the fixed original holder. After placing the transparent original on a movable original stand, the transparent original is placed on a photosensitive belt.) A contact fog light device exposes the transparent original to slit light while closely contacting the JC transparent original with a pressure roll. After exposure, the transparent original is separated from the photosensitive belt, and then the transparent original a developing device that develops with a developer of a color corresponding to the image, a transfer device that transfers the developed image on the photosensitive belt to a transfer sheet attached to a transfer drum, a wood cleaning device that cleans the photosensitive belt after transfer, and Transcription sheet after transcription is complete! ←This is a contact exposure copying machine consisting of a fixing device that is separated from the transfer drum and performs fixing.

The series of operations of the contact exposure copying machine of the present invention will be described in detail below. First, a transparent original is placed on a movable original holder that is maintained at a constant distance from the photosemiconductor photosensitive belt, and the leading edge of the transparent original is Fixed to the pin bar of the document table. Next, the photosensitive belt is charged while moving and stopped directly under the moving document table, and a pressure roll is moved from the leading edge of the transparent original to bring the transparent original and the photosensitive belt into close contact from the leading edge, and at the same time, the pressure bonding is performed. Slit exposure is performed by an exposure lamp that moves in synchronization with the roll, and at the same time, the movable document holder is moved parallel to the photosensitive belt in synchronization with the pressure roll,
Before the leading edge of the movable original holder reaches the rear end of the transparent original -
After stopping the pressure roll, exposure lamp, and moving document stand, and completing the slit exposure process, the pressure roll,
The exposure lamp and the movable original holder are moved to their original positions, thereby separating the transparent original that is in close contact with the photosensitive belt, and developing it with a developer of a color corresponding to the transparent original.

Here, the transfer sheet is sent out and mounted on the transfer drum, and the developed photosensitive belt is moved and brought into contact with the transfer sheet on the transfer drum to transfer the developed image onto the transfer sheet. After transfer, the photosensitive belt is neutralized and cleaned. When a separation net positive film is used as the transmission original, the same procedure is repeated three more times for the separation i positive films of the other three colors. Next, the transfer sheet on which the toner image has been transferred is separated from the transfer drum and fixed by a fixing device.

In conventional color copying machines, color-separated images of a reflective original are sequentially projected onto a photoreceptor, but the spectral energy distribution of the light source, the spectral sensitivity distribution of the photoreceptor, and the spectral energy distribution of the color separation filter are different for each color. Since each separated image is significantly different, methods have been used to adjust the differences in the overall sensitivity of blue, green, and red by changing the exposure time of each color or the exposure amount of each color by adjusting the ND filter or lens aperture. Ta.

On the other hand, in the copying machine of the present invention, color separation filters are not necessary because a separation net photocopy film is used for the original. There is no need to change the amount.

In addition, the exposure method of the present invention is not a method of exposing through a lens, but a contact line light method using a transparent original.
The reproduction is faithful to the original and has good accuracy.

Further, the color of the toner of the developer used in the present invention must be similar to the ink actually used in the offset mark 111. In the case of full-color printing, it is a combination of four colors (ki, red, eye, and dark), similar to general offset printing, and not a combination of six colors, cyan, magenta, and yellow, as in conventional color copiers. .

Further, in order to facilitate understanding of the present invention, the present invention will be explained by specific examples with reference to the drawings.

Figures 1 (a) and 1 (b) show the movements of the pressure roll (11 (2)), the exposure lamp (3), and the movable document holder (4). and photosensitive paper (5) are kept at constant intervals. Figure 1 (a) shows the main, '1 (IG photosensitive belt (5)) and the movable original stand (4) kept at a constant distance.
), the leading edge of the transparent original is fixed to the pin bar (8) of the fixed document table (7), and the pressing roll (11 (21) and the exposure lamp (3
) is a contact exposure device (9) that performs integrated slit exposure, and is kept stationary and on standby. Figure 1 (bl shows the pressure rolls (1), (2), exposure lamp (3), and movable original holder (4) are stopped before the tip of the moving original holder (4) reaches the rear end of the transparent original (6). This figure shows the state in which the slit exposure process has been completed.
If you make the roll 1 (2+) conductive rubber and ground it, the pressure roll (11 (21), exposure lamp (3)
) and the movable original stand (4) to their original positions, and the transparent original (6) that is in close contact with the photosensitive belt (5) is moved to its original position.
), the static electricity on the transparent original (6) is removed by the pressure roll +11 (21), so that the electrostatic latent image formed on the photosensitive belt (5) is not disturbed.

Furthermore, if a freely rotating free roll 001 or the like is attached to the tip of the movable document stand (4), the movement of the transparent document (6) will be smooth. Furthermore, 4. of the movable original stand (4). , ss, limit switch, etc.).

It is advantageous to install a sensor to act as a safety device to ensure that the rear end of the transparency document (6) never becomes dislodged from the leading edge of the moving document holder (4).

Here, when using an inclined movable original stand (4y) on which the transparent original (6) is placed at an acute angle with respect to the photosensitive belt (5) as shown in Fig. The transparent original (6) can be easily mounted on the pin bar (8), and the transparent original (6) that is in close contact with the pin bar (8) can be easily separated from the photosensitive belt (5).

FIG. 3 shows a contact exposure copying machine of the present invention, and the process of selecting a separation mesh positive film as a transmission original and obtaining a color copy will be explained as an example. First, attach the red (or eye) resolution net positive film (6y) to the pin bar (8) of the fixed document table (7), and place it on the movable document stand (4).Next, attach the photosensitive belt (5). The decomposition net positive film (6y Slit exposure is performed while keeping the photosensitive belt (5) in close contact with the film, and before the tip of the movable original stand (4) reaches the rear end of the separation net positive film (Or), the pressure roll (11 (
2) After stopping the exposure wrap (3) and the movable document stand (4) and moving them to their original positions, the separation mesh positive film (61') that was in close contact with the film is separated from the photosensitive belt (5). The photosensitive belt (5) is moved and the developing device f
121 +131041051 -, t is developed with red (or eye) toner. Developing device +121 (+31041 +151 shows the magnetic brush method in the figure, but is not limited to this, and is also adapted to move in response to the separation mesh positive film (6)'. The photosensitive belt (5) moves and advances to the transfer device +161. On the other hand, the transfer sheet a7) is sent out along the guide plate (2) JC) 21 by the pick-up roll (181) and the feed roll (19m), and is transferred to the transfer drum (23). Next, the transfer drum (2
Transfer sheet attached to 31) Photosensitive belt (5 attached to 071)
) and apply a voltage to the transfer drum (231) to electrostatically transfer the developed image.
The transfer sheet aη is attracted to 231 using an electrostatic adsorption charger (
241 and electrostatically adhered by applying a corona discharge from the back side of the transfer sheet oη.

The transfer drum CI'31 is generally a metal roll coated with conductive rubber. After the transfer, the photosensitive belt (5) is neutralized with a static eliminating lamp (c), and the cleaning device (26+
Clean with. During this time, attach the eye version (or red version) decomposition net positive film to the pin bar (8) of the fixed W stacking stand (71) and place it on the movable original stand (4). Transfer the (or red) image to the transfer sheet. Next, perform the same procedure for the clear and black plates.

Next, the transfer sheet (on which the toner images of the four colors red, eye, dark, and dark) have been transferred) (171 is separated from the transfer drum C!31 by a separating claw and conveyed by a conveyor bell) A four-color reproduction is obtained by ejecting the toner to the tray C301Vc.Although the fixing device shown in the figure is an open fixing method, fixing using a heating roll is also effective.

Here, the photosensitive belt is an endless belt, and is made of a flexible thin plate of non-magnetic metal such as nickel or stainless steel, and is coated with Zn〇-resin, Cd8-resin, S
A material provided with a photoconductive layer, such as an e-evaporation system or a SIT optical semiconductor, can be used.

Further, although the transfer sheet is generally paper, it goes without saying that various plastic films can also be used.

Further, a transparent original is generally made of a transparent plastic film as a base, and must be able to be evenly adhered to the original without wrinkles by a pressure roll.

Although this contact exposure copying machine requires manual operation by fixing the transparent original to the fixed original pin bar and placing it on the movable original holder, there is no danger of touching the photosensitive layer on the photosensitive belt. There are no problems such as damage to the photosensitive layer or disturbance or disappearance of the electrostatic latent image. Furthermore, since the time from charging to exposure and from exposure to development is almost constant, a stable image reproduction can always be obtained. moreover,
For example, in the case of color overlapping using a separation net positive film as the original, the separation net "positive film of each color, which has already been aligned and has pin holes opened, is fixed with the pins / (-K11) on the document table.
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48' fl il fl l5tJ:%, fi,
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Since it is an exposure method, the resulting color reproductions are of high quality.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1(a)
(b) is an explanatory diagram showing the movement of the crimping port, exposure lamp, and movable document holder; FIG. 2 is an explanatory diagram illustrating the tilted movable document holder; and FIG. 6 is an explanatory diagram illustrating the contact exposure copying machine of the present invention. An explanatory diagram is shown for each.゛(11 (21...Crimping roll (3)...Exposure lamp (4)...Moving document stand (4?...Slanted moving document stand (5)...
...Photosensitive belt (6)...Transparent original (6 toto separation net positive film (7)...Fixed document table (8)...
Binno (-(9)...Contact exposure device 0 to free roll (111...Charging device (121 (131Q41)
Q51-...Developing device (161...Transfer device side)
...Transfer sheet a second...Pickup roll tll
12flI...Feed roll (21+(221...Guide plate (231...Transfer drum. c!4)...Charger for electrostatic adsorption t25)...Static charge removal lamp■...Cleaning device 07 )... Separation claw (2)... Conveyor belt -... Up against the fixing device @...
Tray patent application type Toppan Printing Co., Ltd. - Representative Suzuki, Kazuo First factor (α) Figure 1 (b)

Claims (1)

[Claims] A charging device that charges the photosensitive belt, a movable original holder kept at a constant distance from the photosensitive belt, a fixed original holder with a bottle attached, and a contact exposure device that performs slit exposure while keeping the transparent original in close contact with the photosensitive belt with a pressure roll. , a contact exposure copying machine comprising a developing device that develops with a developer of a color corresponding to the transparent original, a transfer device that transfers the image to a transfer sheet on a transfer drum, a fixing device that fixes the transfer sheet, and a cleaning device that cleans the photosensitive belt. .