JPH09207301A - Plate making method, plate making apparatus, and printing apparatus - Google Patents

Abstract

(57) An object of the present invention is to provide a plate making method and a plate making apparatus which do not require an original plate sheet having a conductive layer provided on one surface of an insulating layer in advance. SOLUTION: An insulating image is formed on plain paper, and then the plain paper is provided with conductivity.
In addition, an insulating image forming means for forming an insulating image on plain paper and a conductivity imparting means for imparting conductivity to the plain paper on which the insulating image is formed by the insulating image forming means are provided. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-making method and a plate-making apparatus which form an insulating image on plain paper and then impart conductivity to form a plate for electrostatic printing. The present invention relates to a built-in printing device.

[0002]

2. Description of the Related Art There is already known a method of forming an image such as character information on an original sheet by an electrophotographic method, using the image as a plate for electrostatic printing, and performing electrostatic printing using the plate. ing. It will be described in detail with reference to FIGS. 4 to 9. First, there is an original sheet 102 as shown in FIG.
This original sheet 102 has an insulating layer 103 and a conductive layer 1 in advance.
05. Specifically, for example, it is provided as a film having a polyester resin film as a substrate and a surface thereof coated with a conductive polymer. Next, as shown in FIG. 5, an image (plate-making image) with toner is developed on the conductive layer 105 of the original sheet 102, and the image is fixed to form an insulating pattern layer 107 to obtain the plate 101.

Next, as shown in FIG. 6, the charging device 109
Is prepared, and the plate 101 is uniformly charged while the conductive layer 105 is electrically connected to the ground.
The state where the charge of is left is left. Then, as shown in FIG. 7, the developing device 111 is prepared. Liquid toner 115 as a developer charged to the opposite polarity is attached to the developing roller 113 of the developing device 111, and the liquid toner 115 is used for development. That is, the liquid toner 115 is attached to the insulating pattern layer 107 side of the plate 101. Next, as shown in FIG. 8, the printing paper 117 is arranged on the printing plate 101, and the printing paper 117 is pressed against the printing plate 101 side by the transfer / fixing roller 119. As a result, the liquid toner 115 adhering to the insulating pattern layer 107 side is transferred and fixed on the printing paper 117 side, and
The state is as shown in FIG.

Printing on one sheet of printing paper 117 is completed as described above, and thereafter, by repeating the steps of FIG. 6 to FIG.
The plate 101 is used to perform electrostatic printing on a desired number of printing sheets 117.

[0005]

According to the above-mentioned conventional configuration, there are the following problems. There is a difference in image quality between the case of developing an image with toner on the conductive layer 105 of the original sheet 102 and the case of developing an image with toner on the printing paper 117 by the electrophotographic method. There was a problem that it was reflected in the print result of. This is because the toner is accurately electrostatically printed on the electrostatically charged printing paper 117 to form a beautiful image, while the conductive layer 105 disperses the charge, so electrostatic attraction of the toner occurs irregularly. This is because the image is disturbed.

The present invention has been made on the basis of the above points, and an object of the present invention is to provide a plate making method for forming a printing plate capable of obtaining the same quality as that of image formation on plain paper for electrophotography. It is to provide a plate making apparatus, and to provide a printing apparatus using the plate making method by a single apparatus.

[0007]

In order to achieve the above object, the plate making method according to the present invention is characterized in that an insulating image is formed on plain paper, and then the plain paper is rubbed so as to have conductivity. To do. At that time, 10 ⁶ Ω / cm
It is conceivable that conductivity is imparted at a value of ² or less.

Further, the plate making apparatus according to the present invention imparts conductivity to the insulating image forming means for forming an insulating image on plain paper and the plain paper on which the insulating image is formed by the insulating image forming means. And a means for imparting electroconductivity. At that time, the conductivity imparting means 1
It is conceivable that the conductivity is imparted at 0 ⁶ Ω / cm ² or less.

Further, the printing apparatus according to the present invention comprises a plate cylinder,
An insulating image is formed on the sheet feeding means which is arranged at the outer peripheral position of the plate cylinder and supplies plain paper to the plate cylinder, and the plain paper which is arranged at the outer peripheral position of the plate cylinder and is held and rotated by the plate cylinder. And an insulating image forming means for forming a plate for electrostatic printing by imparting conductivity to the plain paper which is arranged at the outer peripheral position of the plate cylinder and on which the insulating image is formed by the insulating image forming means. Electrostatic printing means for performing electrostatic printing on the plain paper supplied to the plate cylinder from the paper feeding means by using the applying means and the plate arranged at the outer peripheral position of the plate cylinder and produced by the conductivity imparting means. And is provided.

That is, in the case of the present invention, the above-mentioned original plate specially produced as a plate material for electrostatic printing is not used, but it is generally called plain paper or copy paper. A standard recording paper for electrophotography (hereinafter referred to as "plain paper") is used to form an insulating image first, and then conductivity is imparted to the plain paper, whereby electrostatic printing is performed. It is a version for. It is necessary that the conductivity be such that the surface charge density, which is the diffusion of charges due to the imparted conductivity, decreases when the above-mentioned insulating image is charged, and the conductivity is imparted at 10 ⁶ Ω / cm ² or less. Can be considered.

The plate making apparatus according to the present invention shows an apparatus for carrying out the above plate making method.

In the case of the printing apparatus according to the present invention,
It is possible to prepare a plate for electrostatic printing and perform electrostatic printing using the plate in one device. Plain paper is fed to the plate cylinder from the paper feeding means, an insulating image is formed on the plain paper by the insulating image forming means, and conductivity is imparted to the plain paper by the electroconductivity imparting means to form a plate for electrostatic printing. To do. After that, the plate is used to electrostatically print a predetermined number of copies of printing paper by electrostatic printing means.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of the present invention will be described. First, a plate making method and a plate making apparatus according to the present embodiment will be described with reference to the block diagram of FIG. First, there is the plain paper 3, and an arbitrary insulating image 5 is formed on one surface of the plain paper 3. The formation of the insulating image 5 is performed by the insulating image forming apparatus 47, for example,
By a known electrophotographic device. Then, the plain paper 3 with the insulating image 5 is introduced into the conductivity imparting device 7 by the feed roller 48. Then, the plain paper 3 to which the conductivity is given becomes the plate 1. The conductivity imparting device 7 includes, for example, as shown in FIG. 2, a pool 11 containing a conductive agent 9, and in the pool 11, plate supply rollers 13a and 13b are provided for insulation. It is conceivable to introduce the plain paper 3 with the sexiness image 5 into the pool 11 containing the conductive agent 9 by these plate supply rollers 13a and 13b. Also, pool 11
It is also conceivable to apply the conductive agent 9 to the back surface of the plain paper 3 with the insulating image 5 by a roller or spray without providing the above. As the conductive agent 9, for example, a binder containing a binder oxide as a main component and a metal oxide and carbon, and a material containing particles such as copper powder, aluminum powder and carbon black are suitable solvents. It is possible to use the one dissolved in the above, the conductive liquid, or the like. That is, the conductivity is 10 ⁶ Ω / cm so that the formed conductive layer is sufficiently conductive to the ground.
You need only show ² or less. It should be noted that 100 to 1000 Ω / cm ² can be achieved for the material containing the above carbon. Further, quaternary ammonium compounds, amines, phosphoric acid esters, fatty acid polyglycols, alcohols such as glycerin and sorbitol, which are generally used as antistatic agents, can also be used as the conductive agent. Is.

When the pool 11 of FIG. 2 is used, the pool 1
1, the conductive agent-impregnated rollers 15a, 15b, 17a,
17b is provided, and these conductive agent-impregnated rollers 15 are provided.
The conductive agent 9 in the pool 11 is impregnated into the plain paper 3 with the insulating image 5 by a, 15b, 17a, and 17b, thereby imparting conductivity. Also, the conductive agent squeezing roller 1
9a and 19b are arranged so that the excess conductive agent 9 is squeezed out from the plain paper 3 coated with the conductive agent 9.

On the outlet side of the pool 11, the heating device 2
1 is arranged, and the heating device 21 includes a pair of heating rollers 21a and 21b. The plain paper 3 from which the excess conductive agent 9 has been squeezed out by the pair of squeezing rollers 19a, 19b is used as the pair of heating rollers 21a, 21.
It is introduced between b and when it passes there, it is pressed while being heated. As a result, the impregnated conductive agent 9 is fixed on the plain paper 3. Through the above steps, the plate 1 for electrostatic printing can be obtained. The insulating image 5 of the plate 1 is applied by the above-described insulating image forming apparatus 47, and by a known toner, for example, 10 ¹³ to 10 ¹⁴ Ω.
The insulating property of / cm ² is achieved, and the surface of the insulating image 5 is repelled by the conductive agent 9 and the insulating property is maintained.

Next, the structure of the electronic printing apparatus will be described with reference to FIG. First, there is a plate cylinder 31, and a sheet feeding device 33 is arranged on the lower left side of the plate cylinder 31 in FIG. This paper feeding device 33
Is for stacking and holding the printing paper 35, which is a plurality of plain papers, in the stocker 37.
9, the uppermost printing paper 35 is sequentially supplied to the plate cylinder 31 side. On the right side of the plate cylinder 31 in FIG.
1 and the plate discharge device 43 are arranged respectively. The printed printing paper 35 is discharged to the paper discharge device 41, and the plate 1 used for electrostatic printing is discharged to the plate discharge device 43.

A scanner device 45 and an insulating image forming device 47 are disposed above the plate cylinder 31 in FIG. The scanner device 45 and the insulating image forming device 47 form an insulating image forming means. A photosensitive drum 49 is arranged in the insulating image forming apparatus 47, and the charging device 5 is provided around the photosensitive drum 49.
1, a laser head device 53, a developing device 57 that supplies toner 55, and a cleaning device 56 that cleans the photosensitive drum 49 are arranged. Further, a plate fixing device 59 is arranged at a position facing the plate cylinder 31 side. The scanner device 45 inputs image data such as character information and outputs it to the insulating image forming device 47.

On the outer periphery of the plate cylinder 31, the conductivity imparting device 7 already described with reference to FIG. 1 is arranged. However, FIG. 3 schematically shows the one adopting the method of applying conductivity, and is different from the impregnation method as shown in FIG. The charging device 6 is provided around the plate cylinder 31.
1, a developing device 63, a transfer device 65, a printing paper peeling device 67, a cleaning device 69, a fixing device 71, switches 73, 75 are arranged respectively, and these charging device 61, developing device 63, transfer device 65, printing The sheet peeling device 67, the cleaning device 69, the fixing device 71, the switches 73 and 75, etc. constitute an electrostatic printing means.

The operation will be described based on the above configuration. First, the case where printing is performed on a small number of print sheets 35 will be described. In this case, basically, the plate 1 for electrostatic printing is not manufactured. First, the paper feeding roller 39 of the paper feeding device 33
Thus, one sheet of printing paper 35 is supplied to the plate cylinder 31. The supplied one printing sheet 35 is held by the plate cylinder 31. On the other hand, in the insulating image forming apparatus 47, the photosensitive drum 49 is in a state of being “negatively” charged by the charging device 51. The image data read by the scanner device 45 is the laser head device 5.
3, the photosensitive drum 49 is exposed. And
The exposed areas are neutralized with a "negative" charge resulting in the formation of an electrostatic latent image.

The electrostatic latent image is developed by the developing device 57.
The toner 55, which is negatively charged, is visualized. Since the toner 55 is made of epoxy resin or the like to which magnetic fine powder such as ferrite and a plastic material are added and has an insulating property, the toner 55 is exposed to the "negative" when the photosensitive drum 49 is exposed. It will adhere to the part. Since the plate cylinder 31 and the photosensitive drum 49 rotate at a predetermined timing, when the printing paper 35 held by the plate cylinder 31 reaches the position of the photosensitive drum 49, the switch 73
By this operation, the toner image is transferred to the side of the printing paper 35 that is charged with the opposite polarity to the potential of the toner 55. The transferred toner image is fused and fixed by the plate fixing device 59, whereby the image formation is completed.

The printing paper 35 is conveyed as it is to the position of the paper peeling device 67 by the rotation of the plate cylinder 31,
The sheet peeling device 67 peels the sheet. The peeled printing paper 35 is ejected into the paper ejection device 41. This completes printing on one sheet of printing paper 35. After that, by repeating the above steps, a predetermined number of printing sheets 35 are printed. When the printing operation is repeated, the photosensitive drum 49 is replaced by the cleaning device 5
6, the photosensitive drum 49 is uniformly charged by the charging device 51.

Next, the case of printing on a large number of copies of the printing paper 35 will be described. In this case, basically, the plate 1 for electrostatic printing is manufactured, and the plate 1 is used for electrostatic printing. In this case, the one printing paper 35 already described
The process up to the step of forming an insulative image is the same as the above, and the plate is used for electrostatic printing through the subsequent steps. That is, the printing paper 35 that has passed through the plate fixing device 59 is provided with conductivity by the above-described conductivity providing device 7. The printing paper 35 having the conductivity is used as the plate 1 for electrostatic printing.

Next, electrostatic printing is performed using the plate 1. First, the plate 1 held by the plate cylinder 31 is uniformly “positive” charged by the charging device 61. By this "positive" charging, the conductive layer of the plate 1 is electrically connected to the ground and becomes substantially ground potential. On the other hand, the part of the insulating image of plate 1 is
The electric charge of 200 to 300 V is retained. next,
In the developing device 63, the liquid toner charged with “negative” is brought into contact with the surface of the plate 1. As a result, the liquid toner is sucked toward the plate 1 and developed.

Next, another printing paper 35 is supplied to the plate cylinder 31 side by the paper feeding device 33, and both the printing paper 35 and the plate 1 come to the position of the transfer device 65. Therefore, when the transfer device 65 applies a “positive” potential by operating the switch 75, the “negative” charged liquid toner on the toner image on the plate 1 is transferred to the printing paper 35 side. It
After that, the toner transferred by passing through the fixing device 71 is fixed and discharged to the paper discharging device 41 side. By repeating the same operation, a large number of printing papers 35
Then, the desired printing will be performed. In that case, the plate 1 is cleaned by the cleaning device 69, and then,
It is uniformly charged by the charging device 61. or,
When the plate 1 is no longer needed after printing a predetermined number of sheets, the plate 1 is discharged into the plate discharging device 43.

According to this embodiment, the following effects can be obtained. First, according to the plate making method according to the present embodiment, unlike the conventional case, an original plate that has been manufactured in advance is not used, but a plain paper 3 for electrophotography is used to form the plate 1. Therefore, it is possible to perform printing with the same quality as electrophotography, and it is possible to greatly reduce the cost required for plate production. That is,
This is because an insulating image may be formed on the plain paper 3 for electrophotography, and conductivity may be imparted to it later. Further, according to the printing apparatus of the present embodiment, a single apparatus is used to manufacture the electrostatic printing plate 1 using the conductivity imparting apparatus, and the electrostatic printing means is used to manufacture the electrostatic printing plate 1. Since printing can be performed, desired printing can be performed according to the number of print copies, even if a plurality of devices that are individually configured are not provided. Further, since the plate 1 is made on the plate cylinder 31 and used for electrostatic printing without being transferred, the plate 1 is not scratched. Further, in the developing device 63 of the printing device, liquid toner is used, and the liquid toner is configured as a developing solution in which a toner having an electric charge is suspended in an insulating liquid. . By using such a liquid toner, it has become possible to perform sharper printing with higher density.

The present invention is not limited to the above-mentioned one embodiment. First, in the insulating image forming apparatus 47 of the printing apparatus, the one using the laser head device 53 is shown as an example of the electrophotographic method, but the invention is not limited thereto, and all known electrophotographic methods can be used. It is possible to apply the included insulating image forming means. Further, in the developing device 63 of the printing device, the development is not limited to the liquid toner, but may be development using dry toner, charging mist or the like. Further, the configuration of the printing device is not limited to that shown in FIG. 2, and the arrangement order of each device around the plate cylinder 31 may be changed.

[0027]

As described in detail above, according to the plate-making method and plate-making apparatus of the present invention, plain paper for electrophotography is used instead of using a pre-made plate as in the prior art. Since it can be used as a plate, the cost required for plate production can be significantly reduced, and compared with the case where an insulating image is formed on a plate that is provided with a conductive layer in advance and electric charges can easily escape. With plain paper for photographs, the charged toner can be reliably transferred, so
The quality of the image is high and, in the end, the quality of the plate for electrostatic printing is high. Further, according to the printing device of the present invention, a single device is used to manufacture a plate for electrostatic printing by using a conductivity imparting device, and electrostatic printing is performed by electrostatic printing means using the plate. Therefore, it is possible to perform desired printing with good quality in accordance with the number of print copies, even without providing a plurality of devices that are individually configured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a plate making apparatus according to an embodiment of the present invention.

FIG. 2 is a view showing an embodiment of the present invention and is a cross-sectional view showing a configuration of a conductivity imparting device.

FIG. 3 is a diagram showing an embodiment of the present invention and is a diagram showing a configuration of a printing apparatus.

FIG. 4 is a diagram showing a method of electrostatic printing in order, showing a configuration of an original plate.

FIG. 5 is a diagram showing electrostatic printing methods in sequence, showing a state in which an insulating image is formed on an original plate.

FIG. 6 is a diagram showing a sequence of electrostatic printing methods, showing a state in which an insulating image on a plate is charged.

FIGS. 7A to 7C are diagrams sequentially showing an electrostatic printing method, showing a state in which toner is attached to an insulating image on a plate and development is performed.

FIG. 8 is a diagram showing the electrostatic printing method in sequence, showing how toner on the insulating image of the plate is transferred to the printing paper side.

FIG. 9 is a diagram showing a method of electrostatic printing step by step, showing a printed printing sheet.

[Explanation of symbols]

 1 plate 3 plain paper 5 insulating image 7 conductivity imparting device 31 plate cylinder 33 paper feeding device 35 printing paper 41 paper discharging device 43 plate discharging device 45 scanner device 47 insulating image forming device 51 charging device 53 laser head device 55 toner 56 Cleaning device 57 Developing device 59 Plate fixing device 61 Charging device 63 Developing device 65 Transfer device 67 Paper peeling device 69 Cleaning device 71 Fixing device 73 Switch 75 switch

Claims (5)

[Claims] 1. A plate-making method comprising forming an insulating image on plain paper, and then imparting conductivity to the plain paper to prepare a plate for electrostatic printing. 2. The plate-making method according to claim 1, wherein
A plate making method characterized in that conductivity is imparted at ⁶ Ω / cm ² or less. 3. An insulating image forming means for forming an insulating image on plain paper, and a plate for electrostatic printing by imparting conductivity to the plain paper on which the insulating image is formed by the insulating image forming means. A plate making apparatus comprising: 4. The plate making apparatus according to claim 3, wherein the conductivity imparting means imparts conductivity at 10 ⁶ Ω / cm ² or less. 5. A plate cylinder, a paper feed unit arranged at an outer peripheral position of the plate cylinder for supplying plain paper to the plate cylinder, and a rotating / conveying unit arranged at an outer peripheral position of the plate cylinder and held by the plate cylinder. And an insulating image forming means for forming an insulating image on plain paper, and a plain paper on which an insulating image is formed by the insulating image forming means, which is arranged at the outer peripheral position of the plate cylinder, and which is electrically conductive. Using electroconductivity imparting means as a printing plate, and a plate prepared by the electroconductivity imparting means arranged at the outer peripheral position of the plate cylinder, to plain paper supplied to the plate cylinder from the paper feeding means. A printing apparatus comprising: an electrostatic printing unit that performs electrostatic printing.