JPS63295258A - Printing device - Google Patents

Abstract

PURPOSE:To enable a printing device capable of high-speed operation and low in cost, by discharge-breaking down an ink-repellent film on a plate sheet to expose an ink-receptive surface, applying an ink to the ink-receptive surface thus exposed, and transferring an ink thus applied to a plate onto a paper by an impression cylinder. CONSTITUTION:An electrode 9 for discharge-breakdown and an earthing member 10 for forming a closed circuit, which are connected to an electrical signal source 8, are disposed on the periphery of a cylinder 1, and are brought into contact with the surface of a plate sheet 2. While the plate sheet 2 is moved relative to the electrode 9 by rotating the cylinder 1, a voltage is applied from the signal source 8, whereby a conductive film 6 and an ink-repellent film 7 are provided with perforations 11 by electric discharge, exposing the surface of an ink-receptive substrate. An ink-supplying member 12 is disposed on the periphery of the cylinder 1. The member 12 applies an ink to image areas of a plate just made. The ink 13 is transferred to a paper 15, which is pressed against the cylinder 1 from rear by an impression cylinder 14, whereby a desired printed matter is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a printing device that can electrically easily create a plate using discharge breakdown and can perform high-speed printing.

(Prior Art) Recently, there has been a demand for printing data and images converted into electronic files in large numbers quickly and inexpensively. One type of printing press currently used for this purpose is an offset printing press. In this method, the data or image converted into an electronic file is printed out using a printer, and then a plate is created electrophotographically, and the traditional offset printing is performed, but the process is cumbersome.

BACKGROUND ART Recently, printing machines have been put into practical use that use a thin sheet with holes punched by a thermal head as a stencil printing plate. Although this printer can instantly create a plate and produce a large number of printed matter at high speed and at low cost, it has the disadvantage that the printing quality is inferior to that of the former offset printing machine. Furthermore, a laser printer is conveniently used, but this has the drawbacks of high cost per sheet and slow speed.

(Problems to be Solved by the Invention) The conventional printing apparatus described above has disadvantages such as poor quality, long printing time, and high unit cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing device that eliminates the conventional drawbacks, has good print quality, is fast, and has a low price per sheet.

(Means for Solving the Problems) The printing device of the present invention includes a cylinder whose side surface is partially cut out and which can rotate at least around a central axis, and a sheet having an ink-receptive surface inside the cylinder. A plate sheet supply roll wrapped with a plate sheet provided with an ink-repellent film that can be destroyed by electric discharge; and a take-up roll provided in the cylinder for winding the plate sheet, and an ink-receptive surface is formed on the periphery of the cylinder by destroying the ink-repellent film on the plate sheet by electrical discharge. an earthing member for forming a closed circuit with an electrode for discharge destruction driven by an electrical signal source to expose the ink-receiving surface; an ink supply member for applying ink to the exposed ink-receptive surface; It is equipped with an impression cylinder for transferring ink to paper. In addition, the plate sheet has an aluminum vapor-deposited film on the plastic surface and an ink-repellent film on top of that, and the plate sheet has a roughened layer on the plastic surface and a roughened layer on top of that. An aluminum vapor-deposited film is attached, and an ink-repellent film is provided on top of the aluminum vapor-deposited film, and an aluminum vapor-deposited film is provided on the surface of the plastic plate sheet.
The plate sheet is made of plastic with a roughened layer on the surface, on which is deposited an aluminum film, and is further provided with a plurality of ink supply members.

(Function) The present invention enables the above-described apparatus to print at a higher speed than ever before, with better quality and lower unit price, and further enables miniaturization and color printing of the apparatus.

(Example) An embodiment of the present invention will be described based on the drawings.

The figure shows the structure, operation, and printing principle of the printing apparatus of the present invention. In the figure, 1 is a partially cut-out cylinder that rotates around its axis. 1 A plate sheet 2 is supplied inside the cylinder 1. A plate sheet supply roll 3 and a take-up roll 4 for winding the plate sheet around the circumference of one cylinder 1 are stored. In this state, the cylinder 1 is rotatable together with each roll 3 and 42 sheets 2.

In the figure, one cylinder 1 is depicted as rotating counterclockwise.

The plate sheet 2 is a sheet that can form an ink-receptive portion and an ink-repellent portion by electric discharge destruction, and several such sheets are known.

Here, 5 is a flexible substrate, the surface of which is ink receptive. A conductive film 6 is provided on the surface of the flexible base material 5 so that it can be destroyed by electrical discharge. Furthermore, an ink-repellent film 7 is provided thereon. A resin sheet is suitable for the flexible base material 5 of the plate sheet 2. The conductive film that can be destroyed by discharge is preferably a vapor-deposited aluminum film, and the ink-repellent film 7 is preferably a silicone rubber film.

An electrode 9 for discharge destruction connected to an electric signal source 8 and a grounding member 10 for forming a closed circuit are arranged on the circumference of the cylinder 1, and each of them is brought into contact with the surface of the plate sheet 2.
When a voltage is applied from the electrical signal source 8 while moving the first printing sheet 2 relative to the electrode 9 by rotation, holes 11 are formed in the conductive film 6 and the ink-repellent film 7 by discharge
It cracks, exposing the ink-receptive surface of the substrate. In other words, a printing plate is created which has ink receptivity in the image area and ink repellency in the non-image area. Although the grounding member 10 is depicted as a roller in the figure, it may also be a fixed sliding brush that does not rotate.The electrode 9 is well known in the art for electric discharge printers. It may be a multi-stylus or a single needle; in the case of a single needle, rotate the cylinder 1.

The electrode 9 may be moved in the axial direction of the cylinder 1.

Next, an ink supply member 12 is provided on the circumference of one cylinder 1. The ink supply member 12 applies ink to the image area of the plate just completed. This inking process is known as lithography. 13 is the ink applied in this way. The ink 13 is transferred to the paper 15 which is pressed from the back side by the impression cylinder 14, and a printed matter is completed.

When one print is completed, the electrode 9 and the ground member 10 are unnecessary until a new print is made, and the contact state is released, and the cylinder 1 is rotated in the same direction in this state. Ink 13 is applied with the ink supply member 12, the paper is pressed with a pressure W414, the ink 13 is transferred, and the second printed matter is finished.

Thereafter, printed matter can be obtained in the same manner.

When making a new plate, the cylinder 1 is stopped, the ink supply member 12 and the impression cylinder 14 are separated, the new surface of the plate sheet 2 is pulled out from the plate sheet supply roll 3, and the old plate is wound up on the take-up roll 4.

In the above description, only the essential elements of the invention have been described, but additional elements can be attached to achieve better printability. for example,
Good results can be obtained by controlling the temperature of each part to manage the delicate state of ink adhesion. Ink supply member 12
This was not explained in the previous explanation, but it is well known in lithographic printing, and the ink supply member, which includes multiple ink mixing rollers, is unitized to facilitate maintenance. is possible. Color printing is also possible by changing the ink color. When printing in multiple colors, the diameter of the cylinder should be increased so that each plate for cyan, magenta, yellow, and black can be printed on the circumference of the cylinder, and each plate should have its own ink supply member. All you have to do is add ink to the paper and pass it through the impression cylinder repeatedly so that each color overlaps on the same surface.

The plate sheet is not limited to the ones mentioned above, but when recording by electrical discharge destruction, the surface is roughened (for example, silica particles are dispersed in a binder) instead of directly depositing aluminum on the surface of the base material. The same applies to the present invention, where it is known that it is easier to break down the aluminum by attaching an aluminum vapor-deposited film thereon.

In the explanation of the figures, apart from the creation of the first plate, the method of applying ink is not limited to the first plate and the method of applying ink to the plate, which is an application of the conventional lithographic printing method. There is also a method.

For example, as described above, the first plate can be used as is without providing an ink-repellent film on the surface of the aluminum vapor-deposited film. That is, the aluminum vapor-deposited film becomes ink-repellent by later moistening it with water. That is, the aluminum vapor deposited film can be removed by discharge breakdown and used as a plate for the conventional printing method known as offset. In this case, it is necessary to moisten the aluminum surface with water, and for this purpose it is necessary to add something like a roller either in front of or behind the ink supply member shown in the figure.

Using a cylinder with a diameter of 10 QI and a part of the side cut out, an experimental device with the configuration shown in the figure was made using a 0-version sheet prepared as follows.

10 parts by weight of urethane resin (Crispan 7209 manufactured by Dainippon Ink & Chemicals Co., Ltd.), 1.5 parts by weight of fine powder silica, and 87.5 parts by weight of ethyl acetate were thoroughly mixed and dispersed, and a crosslinking agent (Crispan Dainippon Ink & Chemicals Co., Ltd.) was thoroughly mixed and dispersed. Co., Ltd.) was applied onto 24μ polyethylene terephthalate at a dry coating weight of 4 g/rd to form a nearly transparent roughened layer.

Aluminum was vacuum-deposited on this roughened layer to a thickness of 600 mm, and a hardening agent (Catalytic) was further applied on top of this.
Silicone resin (KS7) to which 0.5% by weight of RYST
72 Shin-Etsu Chemical Co., Ltd. toluene solution was applied and dried (150° C., 5 minutes) to form a silicone resin with a thickness of approximately 0.5 μm.

Using such a printing sheet, it was arranged so that the silicon film was on the outside as shown in the figure. The 24-bin head of a tungsten needle used in commercially available serial discharge printers and the earth roller are brought into contact with the surface of the plate sheet, the cylinder is rotated at a circumferential speed of 10 am/sec, and characters are printed using a 50 V electrical signal. did. Next, ink for waterless dry lithography (T
Press the rubber ink roller (ink supply member) to which KU Aqualess Process Ink (manufactured by Toyo Ink Mfg. Co., Ltd.) is thinly adhered as shown in the diagram, and after one revolution, release the grounding member and electrode needle from the plate sheet. When the cylinder was rotated several times with the ink roller pressed against it, the ink adhered only to the parts that had been destroyed by electrical discharge.

At this dark point, paper was inserted between the impression cylinder and the plate sheet, and the impression cylinder was pressed against the cylinder. As a result, clear characters were obtained on paper. When the cylinder continued to rotate and the next print was made, the density of the prints became lighter from the second sheet onwards. This is because there is no ink supply, and it is clear that if ink is supplied, printed matter can be produced one after another. When the printed matter using this plate was finished, the used plate sheet was wound up by the take-up roller for one page, and the process was repeated from the beginning to obtain the same result.

(Effects of the Invention) According to the present invention, compared to conventional products, the quality of the printed matter is better, the unit price of printed matter is lower, and printing can be performed at high speed.Furthermore, it is possible to miniaturize the device and use color, and it is possible to put it into practical use. The above effect is significant.

[Brief explanation of the drawing]

The figure is a conceptual diagram of a printing device in an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Cylinder, 2... Plate sheet, 3... Supply roll, 4... Winding roll, 5... Flexible base material, 6... Conductive film, 7... - Ink repellent film, 8... Electric signal source, 9... Electrode, 10.
... Earthing member, 11 ... Hole, 12 ... Ink supply member, 13 ... Ink, 14 ... Impression cylinder. 15...Paper. Patent Applicant: Matsushita Electric Industrial Co., Ltd. Toyo Ink Manufacturing Co., Ltd. 1...Partially overlapping ~'7: Pl Commercial 2-
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[Sword and 3 Voices] I5...Ayatsune Shishisho (Method) September 1, 1986 Mr. Kunio Ogawa, Commissioner of the Patent Office ■, Indication of the case Patent Application No. 130010/1982 2, Name of the invention Printing device 3, relationship with the amended person case Applicant address 1006 Kadoma, Kadoma City, Osaka Prefecture
Name (582) Matsushita Electric Industrial Co., Ltd. (1 person)
Presenter: Akio Tanii (4), attorney (5), date of procedural amendment order: August 5, 1986 (shipment date: August 25, 1986)
6. Number of inventions increased by amendment O8. Contents of amendment (1) In the 6th line of page 13 of the specification, "Figure 1" is corrected to "Figure 1 is". (2) Submit the drawing marked as Figure 1 as shown in the attached sheet. (No change in content) That's all

Claims (6)

[Claims] (1) A cylinder with a partially cut-out side surface that can rotate at least around a central axis, and an ink-repellent film that can be destroyed by electric discharge is provided inside the cylinder on a sheet with an ink-receptive surface. a plate sheet supply roll wrapped with a plate sheet;
and a take-up roll provided in the cylinder that pulls out the plate sheet from the plate sheet supply roll, wraps it around the cylinder with the ink-repellent film facing outward, and then winds it; to form a closed circuit on the circumference of the cylinder with an electrode for discharge destruction driven by an electrical signal source for discharge destruction of the ink-repellent film on the plate sheet and exposing an ink-receptive surface; 1. A printing apparatus comprising: a ground member; an ink supply member for applying ink to the exposed ink-receiving surface; and an impression cylinder for transferring ink on the ink supply member to paper. (2) Claim (1) characterized in that the plate sheet is made of plastic with an aluminum vapor-deposited film on the surface and an ink-repellent film on the aluminum vapor-deposited film. printing device. (3) The plate sheet is characterized in that a roughened layer is provided on the surface of the plastic, an aluminum vapor-deposited film is provided on the roughened layer, and an ink-repellent film is provided on the aluminum vapor-deposited film. A printing apparatus according to claim (1). (4) The printing apparatus according to claim (1), wherein the plate sheet is made of plastic with an aluminum vapor-deposited film provided on the surface thereof. (5) The printing apparatus according to claim (1), wherein the plate sheet is made of plastic and has a roughened layer provided on the surface thereof, and an aluminum vapor-deposited film is attached on the roughened layer. (6) The printing apparatus according to claim (1), characterized in that a plurality of ink supply members are provided.