JPH06134955A - Printer - Google Patents

Abstract

PURPOSE:To omit an operation ceasing loss time for mounting and to obtain high minuteness by disposing an exposure unit, a charger and an ink repellant material peeler on a periphery of a pate having a conductive board, a photosensitive material and an ink repellant layer, and making a printing plate while a printing material remains set in a printer. CONSTITUTION:When a printing plate 1 rotating in a direction of an arrow is corona discharged by a charger 3, an ink repellant layer 13 is charged. Then, when a signal of a light 2 for forming an image pattern is received, an optical semiconductor layer 12 of an exposure unit exhibits conductivity, and hence the layer 13 of this part loses charge, and the charge is grounded through the layer 12 and further a conductive layer 11. Thereafter, ion repellant of a part not exposed is moved by electrostatic power by an ion repellant collector 4 for generating reverse polarity to that of corona discharge of the charger 3, plate making is completed by an ink receiver to obtain the plate. The ink repellant is discharged out of a system by an attracting unit 42. Ink 5 is applied to the plate, and offset printed on a sheet 7 via an offset rubber cylinder 6, an impression cylinder 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device.

[0002]

2. Description of the Related Art An offset method is known as a method of providing excellent image quality by conventional printing means. Photosensitive resin is applied to a metal plate and light is applied to this to accelerate the photochemical reaction of the photosensitive resin,
The non-image area is obtained by exposing the metal surface by chemically rinsing out the reaction area or the unreacted area. This version is called the PS version. The exposed metal surface is hydrophilic and dissociates the oily ink to form a non-image area. On the other hand, the scraped resin portion is lipophilic and adheres to ink. Such an ink is once transferred to a rubber cylinder and then transferred to paper to obtain a printed matter.

As described above, there is a problem that the printing plate is produced outside the printing press and the operation of the printing press is stopped when the printing plate is replaced.

JP-A-60-212386 "Discharge recording material" and PTC / US90 / 05392 (Method and means for
controlling overburn in spark-imaged lithographypl
ate), a method is disclosed in which a plate is installed inside a printing machine in advance and a pattern is formed according to an electric signal for removing or etching the surface of the recording material, that is, the plate by spark discharge or discharge breakdown.

[0005]

However, the method of removing or etching the surface of the recording material, that is, the plate by spark discharge or discharge breakdown has a drawback that the fineness of the image pattern cannot be obtained. An object of the present invention is to provide an apparatus capable of obtaining a high definition image quality.

[0006]

According to the present invention, there is provided a conductive layer electrically grounded, an optical semiconductor layer exposed to light and exhibiting conductivity, a plate comprising an ink repellent layer, a corona discharge electrode provided in a printing machine, It is an apparatus having an optical signal for forming an image pattern, an electrode having a polarity opposite to that of the corona discharge electrode, and means for removing the ink repellent agent etched.

[0007]

In the dark place, the ink repellent layer is charged by corona discharge. By giving an optical signal for forming an image pattern, the photo-semiconductor layer in the exposed portion exhibits conductivity, and thus the ink repellent layer in this portion loses its charge (the charge is grounded through the photo-semiconductor layer and the conductive layer). ). Next, in an electric field that emits a polarity opposite to that of the corona discharge electrode, the ink repellent in the unexposed portion moves toward the electrode due to electrostatic force (Coulomb force). That is, the ink repellent agent remains in the exposed area to become a non-line drawing area, and the non-exposure area becomes an ink receiving line drawing area to make a plate, and a printing plate can be made.

[0008]

【Example】

Embodiment 1 FIG. 1 is a block diagram of an apparatus according to the present invention, which is installed in a printer main body. 1. The plate comprises 11. an electrically conductive layer which is grounded, 12. a photosensitive layer, 13 and an ink repellent layer. 1
・ The plate rotates in the direction of the arrow, and first, in a dark place, it receives corona discharge by a charger and is irradiated with ions. Next, 2) an image pattern is written by light (exposure), 3) an ink repulsive agent collector that generates an electric field having a polarity opposite to that of the charger, and 4) an ink repellent collector is completed to form a printing plate. 1. The ink repellent separated from the plate is discharged from the system by the suction duct 42.

Ink is applied to the printing plate, and 6 is an offset blanket cylinder, 62 is an offset cylinder, and the ink is offset printed on 7 paper. Printing is repeated using several 51-ink rollers to provide a uniform supply of ink.

Embodiment 2 The mechanism of plate making will be described with reference to FIG. 11. An aluminum thin film or transparent indium-tin oxide (ITO) is used for the electrically conductive layer. 12. The photosensitive layer is made of amorphous cadmium, silicon, phthalocyanine, or the like 122. The light receiving portion is changed to be electrically conductive.
13. The ink repellent layer is, for example, a dimethylpolysiloxane-based silicone resin, and an oil-repellent substance is selected.
In a dark place, 3 ・ Corona discharge is received by the charger and 13 ・ The ink repellent layer is charged. In this example, the value is negative, but the opposite should not be denied. In the next step, the image pattern is exposed (2. light),
Indium-tin oxide (ITO) with transparent electrically conductive layer
If, for example, is used, the exposure through the 11 / electrically conductive layer is also possible. 122, 131 of the exposed portion, and the ink repellent layer loses electric charge. This is because the 12 / photosensitive layer changes to electrical conductivity and is grounded via the 11 / electrically conductive layer. Next, 4. The polarity of the electrode of the ink repellent agent collector is opposite to that of the ink repellent agent layer. The charged ink repellent 4 moves toward the electrode by the Cloning force 12
1. It becomes an ink receiving part. On the other hand, the exposed part is 13
1. Ink repellent part.

[0011]

EFFECTS OF THE INVENTION (1) Platemaking is possible with the printing material set inside the printing machine, and the operation stop time loss for mounting can be omitted.

(2) Since the image signal is written by light, high definition can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus.

FIG. 2 is a diagram showing a structure of a plate.

[Explanation of symbols]

1 ... Plate, 2 ... Light, 3 ... Charger, 4 ... Ink repellent agent collector, 5 ... Ink, 6 ... Offset blanket cylinder, 7 ... Paper, 11
... Electrically conductive layer, 12 ... Photosensitive layer, 13 ... Ink repellent layer, 21 ... Multi-faced mirror, 42 ... Suction duct, 51 ... Ink roller, 62 ... Impression cylinder, 121 ... Ink receiving section, 122
... Photosensitive part, 131 ... Ink repellent part, 132 ... Charged ink repellent.

Claims (2)

[Claims] 1. A printing apparatus comprising an exposure plate, a charging unit, and an ink repellent material stripper disposed around a plate having a conductive substrate, a photosensitive material and an ink repellent layer. 2. A conductive layer which is electrically grounded, an optical semiconductor layer which is exposed and exhibits conductivity, a plate comprising an ink repellent layer, a corona discharge electrode provided in a printing machine, an optical signal for forming an image pattern, A printing apparatus comprising: an electrode having a polarity opposite to that of the corona discharge electrode; and means for removing the etched ink repellent agent.