JPS5944225B2 - Printing device equipped with plate-making device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing apparatus in which a plate making means is attached to a plate cylinder of a lithographic printing press, a letterpress printing press or an intaglio printing press.

Printing plates include original plates made from manuscripts by typesetting, photoengraving, etc., printing plates made from the original plates to be attached to printing machines, and plates with printing surfaces formed on the circumferential surface of the plate cylinder itself. .

However, in either case, the printing process is done using a separate device from the printing press, and printing is carried out by attaching the printing plate or printing cylinder with the printing plate thus made to the printing cylinder or printing press. It is. Therefore, the printing apparatus has the disadvantage that it requires work to attach the printing plate or plate cylinder and adjustment work associated therewith before its operation, which requires a lot of labor and time. In this invention, a plate-making means is attached to a plate cylinder provided with a plate-making substrate, and a cleaning device is attached to the plate cylinder to apply optical signals, electric signals, and other plate-making signals. It is an object of the present invention to solve the above-mentioned drawbacks by providing a printing device equipped with a plate-making means, which is characterized in that it forms a print and can further remove the print to form another plate. .

That is, an object of the present invention is to provide a printing device for printing a large number of different plates in a short time without requiring a separate plate-making device, and thus without requiring installation and adjustment work of printing plates or plate cylinders. It is in. A further object of the present invention is to provide a printing apparatus that can contribute to complete automation of printing by eliminating manual work such as mounting and adjusting printing plates or plate cylinders.

Another object of the present invention is to provide a printing device that does not require a printing plate mounting portion on the plate cylinder, thereby making it possible to print an infinite number of continuous lines.

The present invention will be described with reference to an embodiment based on an offset type lithographic printing machine. In Fig. 1, 1 is an impression cylinder, 2 is a blanket cylinder, 3 is a plate cylinder, 4 is an ink roller, 5 is a water supply roller, and The cylinder 2 is removably attached to the impression cylinder 1 and the plate cylinder 3, and also has an ink roller 4 and a water supply roller 5.
is detachably attached to the plate cylinder 3.

The surface of the plate cylinder 3 is coated with a hydrophilic metal such as stainless steel or chrome and grained, and a lithographic photosensitive liquid is applied onto the hydrophilic metal on the surface using a developer described later to provide a plate-making base. On the circumferential surface of the plate cylinder 3, an exposure unit 6 and a developing unit 7 are installed.
A plate-making means consisting of the following is attached. The exposure device 6 has the image shown in Fig. 2A.
, b. In case a, a printing light source such as a xenon lamp is used in the exposure device 6', which is installed inside the endless original belt 8 and irradiates light toward the printing cylinder 3 from behind. The original belt 8 supports an original film bonded to the same length as the circumference of the plate cylinder 3 in an endless manner with three rollers, and can be attached to and detached from the plate cylinder by two rollers. It is attached and arranged so as to rotate in close contact with the surface of the plate cylinder 3. The exposure device 6'' in b is a reception scanning head using a discharge tube, which receives the suitably amplified current transmitted from the photoelectric conversion device, converts it into an optical signal, and applies it to the surface of the plate cylinder 3. The photoelectric conversion device is composed of a transmission scanning head 9 using an ultrafine light source and a phototube. 10 is a transmission drum around which a document or original plate is wound.

Therefore, in the case of the exposure device 6 of b, the original plate belt 8 is not required, and it is also possible to make a plate directly on the plate cylinder 3 by transmitting it by facsimile over a long distance. The developing device 7 is a liquid tank 11
, liquid extraction roller 12, intermediary roller 13, application roller 14
These three rollers roll into contact with each other to apply the developer in the liquid tank 11 to the surface of the plate cylinder 3. The application roller 14 is removably attached to the plate cylinder 3. A cleaning roller 15 for applying a release agent to the plate surface is also removably attached to the plate cylinder 3. The cleaning roller 15 and cleaning tank 16 constitute a cleaning device 17 (first embodiment). FIG. 3 shows another embodiment using electrostatic transfer (second embodiment). Reference numeral 18 denotes a transfer belt, which is a support made of a flexible material such as a synthetic resin and coated with a photoconductive semiconductor such as selenium or zinc oxide. In the case of zinc oxide, a synthetic resin is used as a binder to disperse it evenly, and this is applied to the support.

A charger 19 using a corona discharge tube, an exposure device 6 and a developer 20 as shown in FIGS. 2A and 2B are attached to the outer periphery of the transfer belt 18. The developing device 20 includes a toner tank 20,
Feed roller 22 covered with mohair, said roller 2
2 and a velvet-covered imprinting roller 24, each of which rolls into contact to cause the toner in the toner reservoir 21 to adhere to the latent image on the transfer belt 18. The imprint roller 24 is detachably attached to the transfer belt 18. The transfer belt 18 is supported by four rollers and is detachably attached to the plate cylinder 3 so as to rotate in close contact with the surface of the plate cylinder 3. The contact portion is formed by two of the four supporting rollers, and a corona discharge tube is installed inside the transfer belt 18 to charge the transfer charger 2.
5, and together with the above-mentioned close contact portion constitutes an electrostatic transfer portion. A fixing device 26 is provided on the outer periphery of the plate cylinder 3 and includes an infrared lamp.

Thus, the above-mentioned transfer belt 18, charger 19, exposure device 6'6I1 developing device 20, transfer charger 25, fixing device 26
, and other attached equipment constitute a plate-making means. Plate cylinder 3
A rotating brush 27 is also removably attached to the outer periphery of the cleaning device 27, and the brush 27 and the vacuum suction bar 28 constitute a cleaning device 27'. In this example, the surface of the plate cylinder 3 is coated with a hydrophilic metal to form a plate-making base. FIG. 4 shows another embodiment using electric signals (third embodiment).

The surface of the plate cylinder 3 is coated with a photoconductive material such as a selenium vapor deposited film, zinc oxide fine particles, and a resin binder layer such as silicon to form a plate-making base. Reference numeral 29 denotes a receiving scanning head which uses a single needle electrode or other electronic recording device to appropriately amplify the current transmitted from the photoelectric conversion device and supplies it to the plate cylinder 3 as an electrical signal.

The photoelectric conversion device is composed of a light source 9 and a phototube as in the second embodiment. A developing device 30 includes a toner tank 31 and a toner roller 32 that is detachably attached to the plate cylinder 3, and also serves as a toner ink supply device during printing.

33 is a fixing device consisting of an infrared lamp.

The receiving scanning head 29, the developing device 30, and the fixing device 33 are arranged around the outer periphery of the plate cylinder 3 and constitute plate making means.
Other electronic recorders used in the reception scanning head include one in which single-needle electrodes are densely packed (in the case of the pin matrix method), and one in which fine metal wires are embedded in the face of a CRT tube at a density of 10 to 15 wires/Wrln. (when using the pinch-Uve method), etc. 34 is a charger that uses a corona discharge tube.

A cleaning device 35 includes a cleaning tank 36 and a cleaning roller 37, and the cleaning roller 37 is detachably attached to the plate cylinder 3.

38 is a transfer charger that uses a corona discharge tube.

38 is a fixing device using an infrared lamp.

Next, the operation of each embodiment, from plate making to printing to further plate making, will be explained. In the first embodiment, the blanket cylinder 2, the inking roller 4, the water supply roller 5, the original belt 8, the applicator roller 14, and the cleaning roller 15 are all removed from the plate cylinder 3. Pre-treatment and photosensitive liquid application] First, the liquid tank 11 is filled with a plate cleaning and degreasing liquid such as toluene, the coating roller 14 is attached to the plate cylinder 3 and the plate cylinder 3 is rotated, and then the coating roller 14 is removed. The cleaning liquid is collected from the liquid tank 11, and then the liquid tank 11VC is filled with water and applied to coat the application roller 14, and the surface of the plate cylinder 3 is degreased and cleaned. During this time, the plate cylinder 3 continues to rotate. Next, the application roller 14
The water in the liquid agent tank 11 is recovered, and the liquid agent tank 11 is filled with a dilute acid solution such as dilute hydrochloric acid, and the application roller 14 is used to thoroughly wash the surface of the plate cylinder 3. ? ! ! After the surface of the plate cylinder 3 is washed with water by the same operation, the lithographic photosensitive liquid is replaced in the liquid agent tank 11, and this is applied to the surface of the plate cylinder 3 by the coating roller 14. Since all of these operations are performed automatically, the times for attaching and detaching the application roller 14 and for the attached state are set in advance. Each liquid that fills the liquid tank 11 and is collected is circulated by a circulation pump (
(not shown), and is linked to the attachment and detachment of the application roller 14. After applying the photosensitive liquid, the coating roller 14 is removed and the plate cylinder 3 is rotated at low speed to dry the photosensitive liquid. In this case, in order to shorten the drying time, an infrared light bulb (not shown) may be attached around the plate cylinder 3 to irradiate the surface of the plate cylinder 3, and the temperature of the photosensitive liquid may be lowered to 60°C. It may be heated to about .degree. C. and circulated, or a photosensitive liquid for low temperature drying may be used. In any case, the drying time may be set in advance using data and the timing may be stored in the automatic device. [Plate making] In the case of FIG. 2a, when the original belt 8 is attached to the plate cylinder 3, the exposure device 6' is turned on in conjunction with this, and exposure is started. Since the original belt 8 is conveyed in close contact with the surface of the plate cylinder 3 which is rotating at a low speed, during this time the VC2
The portion of the book that is in close contact between the support rollers is exposed to light. The rotational speed of the plate cylinder 3 depends on the intensity of the light source, the original belt 8 and the exposure device 6.
The circumferential speed is determined by the distance between the plate cylinder 3 and the original plate belt 8 and the area of close contact between the plate cylinder 3 and the original plate belt 8. The plate cylinder 3 rotates once and the exposure ends. After the exposure is completed, the original belt 8 is taken off, the liquid tank 11 is filled with developer, and the coating roller 14' is attached to develop while rotating the plate cylinder 3. In the case of photoresist film, the exposed areas are melted and removed. Next, the plate is washed with water in the same manner to complete the plate making. Figure 2b
In this case, the original or original is wrapped around a transmission drum 10 and scanned by a transmission scanning head 9 serving as a light source, and the light reflected from there is received by a phototube and converted into an electric current. This current is amplified as necessary and sent to the discharge tube, thereby exposing the surface of the plate cylinder 3. Regarding development, plate making is performed in the same manner as above. [Printing] By normal lithographic printing method,
Water supply roller 5, inking roller 4, blanket cylinder 2
are adhered to the plate cylinder 3 in this order, and the main body to be printed is passed between the impression cylinder 1 and the blanket cylinder 2 for printing.

[Another plate making] After printing is completed, clean the cleaning roller 1.
5 on the surface of the plate cylinder 3, apply a release agent, elute the photoresist film surface that formed the image area, completely remove the release agent with a solvent such as toluene, and then rinse thoroughly with water to complete cleaning. do. In this way, the surface of the plate cylinder 3 has returned to its state before plate making, so plate making of a different content is performed according to the plate making order described above. In the above operations, the blanket cylinder 2, the inking roller 4, the water supply roller 5, the application roller 14, and the cleaning roller 15 are all automatically detached from the plate cylinder 3, and the plate cylinder 3 is exposed. The receiving scanning head 6I is not in contact with the plate cylinder 3 and is not in contact with the original plate belt 8.
Since the plate cylinder 3 is removed except during exposure, all of these operations can be performed with the plate cylinder 3 attached to the printing press. In addition, since the coating agent is replaced in the liquid agent tank 7 by automatic operation of the pump, not only can the plate surface be changed automatically by repeating the above operations, but also the exchange of the coating agent in the transmitting and receiving scanning head can be performed automatically. Depending on the application, it is possible to make a plate directly from a printed manuscript, or it is also possible to make a plate using a memory tape. Regarding the second embodiment, [plate making] First, the transfer belt 18 coated with a photoconductive semiconductor is positively charged with a charger 19 of a corona discharge tube, and then the surface of the belt 18 is exposed with an exposure device 6. Exposure is shown in Figure 2a
Alternatively, it can be performed in the same manner as the BVC method. This changes the charge distribution and forms an electrostatic latent image on the transfer belt 18. Next, this transfer belt 18 is transferred to a developing device 20,
Here, toner ink (fine resin particles colored with carbon or the like) that is uniformly distributed by the sliding movement of the distribution roller 23 is attached to the latent image on the transfer belt 18 from the imprint roller 24 by a coulomb. Next, this belt 18 is transferred to an electrostatic transfer section supported by two rollers, where the toner ink adhering to the latent image is removed from the plate by corona discharge from the transfer charger 25. Transfer it to the surface of cylinder 3. The toner ink transferred to the surface of the plate cylinder 3 is heated and fused by an infrared lamp fixing device 26 to form image lines. Since the surface of the plate cylinder 3 is coated with a hydrophilic metal as described above, the image area is oil-sensitive due to the welding resin, and the non-image area is hydrophilic, so that a lithographic print is formed there. become. [Printing] From then on, printing is performed in the same manner as in the first embodiment.
[Another plate making] After printing is completed, the ink roller 4, water supply roller 5, and transfer belt 18, which is an electrostatic transfer unit, are removed from the plate cylinder 3 and rotated at low speed, and the plate cylinder 3 and blanket cylinder are removed. 2. Ink and water on the surface are removed. Next, when the blanket cylinder 2 is removed and the rotating brush 27 is brought into close contact with the printing cylinder 3 while the printing cylinder 3 is rotating at a low speed, the resin in the image area of the printing cylinder 3 is scraped off by the rotating brush 27, and the vacuum suction bar 28 and sent to a removal resin tank (not shown). As a result, the surface of the plate cylinder 3 returns to its state before plate making.
On the other hand, since the transfer belt 18 has lost its latent image due to corona discharge in the electrostatic transfer section, it can be used repeatedly. Therefore, when printing a different content, by repeating the plate-making operation described above, a plate surface can be formed on the surface of the plate cylinder 3 while the plate cylinder 3 is attached to the printing press. Regarding the third embodiment, [plate making] plate making is performed by a single needle electrode facsimile. This involves attaching the original to a cylindrical support, scanning it from the edge with a minute light source, photoelectrically converting the reflected light with a phototube, and applying this electrical signal to a single-needle electrode that scans in synchronization with the original while serving as the operating source for electronic recording. A charge image is formed on the cylinder 3. The plate cylinder 3, whose surface is given an electrostatic charge by the receiving scanning head 29, is immediately developed with toner in the developing device 30, and the toner ink is welded and fixed in the infrared fixing device 33. [Printing] Next, the receiving scanning head 29 and the fixing device 33 are removed, and an electrostatic charge is applied to the surface of the plate cylinder 3 by the corona discharge tube charger 34, so that the selenium vapor and deposits coated on the surface of the plate cylinder 3 are removed. Since a photoconductive material such as a film is conductive under exposure to light, the electrostatic charge is only present in the image area. Therefore, if toner ink is supplied from the developing device 30, the toner ink will adhere only to the image area. Here, if the printing material 40 is brought into close contact with the plate cylinder 3 and corona discharge is performed from behind using the transfer charger 38, the image area toner ink is transferred to the printing material 40. When the printing medium 40 passes through the infrared fixing device 339, the toner ink is fixed and printed. [Another plate making] After printing is completed, the cleaning roller 37 of the cleaning device 35 is brought into close contact with the surface of the plate cylinder 3 to dissolve and remove the toner image area. A dissolving solution that does not act on the zinc oxide binder and dissolves only the toner support resin is selected and used. The toner resin generally uses phenol or the like and is solvent-soluble. Zinc oxide and binder are insoluble in silicone resin and the like. As a result, the surface of the plate cylinder 3 returns to the state before plate making, so even when printing different content, by repeating the above plate making work, the plate cylinder 3 can be attached to the printing machine and the plate can be printed. A print can be formed on the surface of the cylinder 3. In addition to the single-needle electrode facsimile method described above, there are other methods of applying electrostatic charges to the plate cylinder 3, such as the pin matrix method and the pinch tube method.

It is also possible to perform offset printing as in the first and second embodiments by subjecting the non-image areas to hydrophilic treatment (applying gum arabic, silicone, etc.) after toner development. ．． In this case, the image area may be removed by cleaning using a solvent. In the above text, the structure and operation of the present invention have been described using an offset lithographic printing machine as an example, but the present invention is also applicable to direct printing lithographic printing, and the synthetic resin layer coated on the plate cylinder 3 is If it is made thicker than that, the plate-making device according to the present invention can be used in a letterpress printing press.

Further, in this text, an example is shown in which a water supply device is attached so as to be able to supply water to the plate cylinder, but the water supply device may be attached so as to be able to supply water to an ink cylinder. Furthermore, by reversing the polarity of the optical signal and the polarity of the electrical signal applied during platemaking, it is possible to use the platemaking apparatus according to the present invention in an intaglio printing press. Since the present invention has the above-described configuration, it does not require a separate plate-making device, and therefore does not require installation or adjustment work of printing plates or plate cylinders, making it possible to print a large number of plates in a short time. This makes it possible to fully automate printing and even print an infinite number of continuous lines.

[Brief explanation of drawings]

1, 3 and 4 are schematic diagrams of a printing apparatus showing each embodiment of the present invention, and FIGS. 2a and 2b are enlarged views showing an example of the exposed portion of each of the above embodiments. 1...impression cylinder, 2...blanket cylinder,
3... Plate cylinder, 4... Roller with ink,
5...Water supply roller, 6...Exposure device, 6
'... Exposure device (printing light source), 6, 6I...
・・Exposure device (reception scanning head), 7・・・・
・Developer, 8...Original plate belt, 9...
Transmission scanning head, 10... Transmission drum, 11... Liquid agent tank, 12... Liquid extraction roller, 13... Intermediate roller, 14... ...
・Application roller, 15...Cleaning roller,
16...Cleaning tank, 17...Cleaning device, 18...Transfer belt, 19...
...Charger, 20...Developer, 21...
... Toner tank, 22 ... Feed roller, 2
3...Distribution roller, 24...Impression roller, 25...Transfer charger, 26
...Fuser, 27...Rotating brush, 2
8...Vacuum suction bar, 29...Reception scanning head (single needle electrode), 30...Developer, 31...Toner tank, 32... ...Toner roller, 33...Fuser, 34...
Charger, 35...Cleaning device, 36...
... Cleaning tank, 37 ... Cleaning roller, 38 ... Transfer charger, 39 ...
... Fixing device, 40 ... Printing material.

Claims (1)

[Claims] 1. A plate-making means for applying optical signals, electric signals, and other plate-making signals to a plate cylinder provided with a plate-making base material, and a cleaning device further attached to the plate cylinder, so that the plate can be used while the plate cylinder is attached to a printing machine. 1. A printing device equipped with a plate-making means, characterized in that a printing plate is formed on the surface of a cylinder, and the printing plate can be removed to form another print. 2. A patent claim in which the surface of a plate cylinder made of a hydrophilic metal is coated with a photosensitive substance to provide a plate-making base, and an exposure device and a removable developing device constituting plate-making means are attached around the circumference of the plate cylinder. A printing device equipped with the plate-making means according to Scope 1. 3. Printing equipped with plate-making means according to claim 1 or 2, in which an exposure device is installed inside the original plate belt facing the plate chest, and the original plate belt is transferred while being in close contact with the plate cylinder for exposure. Device. 4. The plate making means according to claim 1 or 2, wherein the reception scanning head is used as an exposure device, and the current converted by a photoelectric conversion device consisting of a light source and a phototube is further converted into light to expose the surface of the plate cylinder. Attached printing device. 5 The surface of the plate cylinder is coated with a hydrophilic metal to provide a base for plate making,
A transfer belt whose surface is coated with a photoconductive substance and which is electrically charged is detachably attached to the plate cylinder so as to rotate in close contact with the plate cylinder, and a charger, an exposure device,
The plate-making means according to claim 1, which is provided with a removable developing device, a transfer charger on the inside of the belt, and a fixing device on the circumference of the plate cylinder. Attached printing device. 6. The surface of the plate cylinder is coated with a photoconductive substance to provide a plate-making base, a single needle electrode or other electronic recording device that receives the photoelectrically converted current is used as a receiving scanning head, and a fixing device and a removable developing device are attached to the plate cylinder. A printing device equipped with a plate-making means according to claim 1, which is attached to the circumference of the plate-making means.