Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G15/00—Apparatus for electrographic processes using a charge pattern
  • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
  • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
  • G03G15/108—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer with which the recording material is brought in contact, e.g. immersion or surface immersion development

Definitions

• the present invention relates to a developing device for a printing original plate. More specifically, it is used in a developing process in a lithographic printing plate manufacturing apparatus that uses a printing original plate having a photoconductive photosensitive layer and obtains a visible toner image by an electrophotographic method. And ⁇ ⁇ appropriate for the developing device.
• the present inventors have previously made Japanese Patent Application Nos. 56-124, 218 and 56-124, 129, which show that a negative film was unnecessary.
• Such prior art uses a conductive metal plate such as an aluminum plate as a support, and, for example, a photoconductive organic pigment in a resin such as phenol resin on the support.
• An electrophotography method using a printing master in which a dispersed photoconductive photosensitive layer, especially copper phthalocyanine, is coated with a photoconductive photosensitive layer dispersed in a borax resin. Therefore, the electrostatic latent image is formed on the photosensitive layer after the charging and exposure steps are completed, and the latent image is passed through a developing step to obtain a toner visible image.
• the present invention relates to a developing device suitable for use in such a developing step.
• the support such as recording paper is paper.
• a liquid developing device in which a conductive metal plate such as an aluminum plate is used as a support has been put to practical use. Therefore, there are currently many problems associated with the practical application.
• the electrostatic latent image surface on the photosensitive layer side of the original plate and the toner imaged surface are completely damaged. No attachment is allowed.
• it is necessary to prevent the liquid developer from being sufficiently squeezed and from being carried into the next process for example, a rinsing process using a rinsing solution or a heat fixing process. And other problems.
• the present invention has been made in order to solve the above-mentioned various problems, and it is an object of the present invention to provide a printing original plate capable of preventing damage to an electrostatic latent image surface or a toner image surface and enabling uniform development. It is intended to provide a developing device.
• Other objects of the present invention will be made clear by the following description of the present specification, and a brief description of the drawings will be made.
• FIGS. 1 and 2 are schematic side and plan views showing a typical embodiment of the present invention
• FIGS. 3, 4, and 5 are m-m ⁇ , IV-IV ⁇ , respectively.
• V — V line at f R in enlarged section is there
• FIGS. 1 and 2 are schematic side views and plan views showing a typical embodiment of the present invention.
• FIGS. 3, 4, and 5 are each a line, a line, and an IV. IV line, V — In enlarged sectional view corresponding to V line
• a printing original plate 1 having a photoconductive photosensitive layer coated on a support such as an aluminum plate has its electrostatic latent image surface facing upward, After being guided and conveyed to the developing device according to the present invention and subjected to toner development by the liquid developer filled in the developing tank 2, it is guided and conveyed to the next step. That is,
• the structure is such that the developer enters the developing device according to the present invention from the left, and is sent out from the right.
• the developing tank 2 of the present invention has an inlet 3A and an outlet 3B which are open at the front and rear ends, respectively, and has a small distance (printing) above and below.
• An upper guide plate 4A for example, a flat plate such as an aluminum plate
• An upper guide plate 4A which is separated by a distance of, for example, several cages, which is several times or less than the thickness of the original plate, and which is disposed in a substantially flat and opposing manner.
• Conductive metal plate etc.) and lower guide plate 4B (it is not always necessary to be formed of conductive material.). Power the upper and lower guide plates
• a slit-like liquid developer supply port 6 is provided between both ends thereof in a direction perpendicular to the plate transport path.
• the developer supply port 6 is connected to a chamber 17 for forming a liquid reservoir of the liquid developer D], and the liquid is supplied by an overflow ⁇ from the chamber 7.
• the developer is introduced into the space g in the developing tank 2.
• the upper guide plate 4A is applied with a positive or negative potential.
• Reference numeral 13 in the figure is a guide member which is disposed on the outlet side of the developing tank 2 to support and slide the support side (that is, the lower surface side) of the plate 1. To prevent contamination-parallel to plate transport direction 3 ⁇ 4 Has a plurality of ridges 14.
• the liquid developer is squeezed, for example, as follows. First, the liquid developer D flowing out from the inlet 3 A of the developing tank 2 and propagating on the original 1 is supplied to the inlet side air squeeze which blows out pressurized air toward the developing tank 2. Backflow is prevented by the closing member 15. On the other hand, the master that passed through developing tank 2
• the liquid developer D remaining on 1 is air-squeezed by an outlet-side air squeezing member 16 that blows out pressurized air toward the developing tank 2.
• 17 is a tank for storing the liquid developer D
• 18 is a return tank for returning the used developer D to the tank 1
• P is the developing tank in the tank 17.
• Pump for recirculating agent D, and B indicates a blower.
• the development top is composed of two stages. _ Specifically, ⁇ The development barrel and the transportation ⁇ -rule are set as a set, and the plate cutting path and the transport path are fB. Two or more sets should be arranged side by side from the entrance to the exit of the developer.]? Sufficient development time should be ensured, or the development tank 2 should be arranged substantially horizontally.
• either the inlet 3A or the outlet 3B (for example, the outlet 3B side) is arranged to be slightly inclined so as to descend, and the compressed air is blown from the descending position side.
• ⁇ ) Prevent the liquid developer D in the developing tank 2 from rafting more than the supply amount, so that the developing tank 2 is always filled with the liquid developer. Such a configuration may be adopted.
• the upper guide plate 4A constituting the developing tank is used as a developing electrode from the viewpoint of a developing function.
• a positive potential may be applied depending on the toner polarity of the developer.]
• a negative potential may be applied or grounded to zero potential.3)
• the charge can be applied.
• the toner image formed by the liquid developer used to visualize the electrostatic latent image of the master 1 can be controlled, and a good image can be obtained. That is, the master 1 on which the electrostatic latent image has been formed is transported by the rolls 12A and 12B, and is fed into the developing tank 2 filled with the liquid developer D from the inlet 3A.
• the space g of the developing tank 2 is always filled with the developer. That is, the developer D is stored in the chamber 17 through the tank 17, the pump P, the introduction pipe 8, the container 9, and the small hole 11, and the air bubbles are removed, and the overflow is removed. It is led to the supply port 6 by the row and flows into the space g to be filled.
• the printing original plate processed by the present invention is extremely easily damaged due to its physical properties, but according to the present invention, the electrostatic latent image surface or the toner image surface of the original plate is damaged. It has no problem and may adversely affect printing performance. More specifically, the printing original plate is attached to the plate cylinder of the printing press during printing by an automatic plate making machine or the like. At this time, both side edges of the plate are attached to the plate attaching portion and attached. Generally, both sides of the original plate inserted into the plate's insertion portion are located at positions irrelevant to the printing surface of the plate cylinder. Therefore, according to the present invention, even if it is damaged by the edge conveying port, the printing performance and the like are not affected. ⁇

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Wet Developing In Electrophotography (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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Citations (14)

• 1981
  • 1981-11-10 JP JP17893981A patent/JPS5880658A/ja active Granted
• 1982
  • 1982-11-09 WO PCT/JP1982/000435 patent/WO1983001691A1/ja active Application Filing

Patent Citations (16)

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