JPS5885462A - Fixing device for original form - Google Patents

Abstract

PURPOSE:To secure the safety in heat fixing, by removing the residual solvent of the rinse liquid, which is used to a liquid developer and an excess toner used for forming a toner image, by vaporization before heat fixing. CONSTITUTION:When an original form 1 carried from an inlet 9A of a drying part 3 through an inlet 21A of an outside casing 19 is carried by carrying roll 7, heated and pressurized air is blown to the original from an air squeeze part 8 in the form of an air knife, and the residual solvent on the form is removed by vaporization. The form 1 is carried to an inlet 18A of a fixing part and is entered to a fixing part 4 and is fixed thermally by heat rolls 16B and 16A and/or a heating plate 17 and is sent to the bollowing cooling stage through an outlet 18B of the fixing part 4 and an outlet 21B of the casing 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixing device for a printing original plate. In detail, the electrodeposition process V in the lithographic printing plate production #1a in which a printing original plate having a photoconductive photosensitive layer is used and a toner image is visualized by a ``decoupling photography method'' is described. Regarding fixing device VC.

Mokushameisha and others previously filed a patent application 1983-124128+i.
No. 56-124129 and I~ propose a V-forming method for lithographic printing plates that does not require a negative film and can shorten plate-making time and plate-making costs, etc. 1. Ta. This previously proposed technique uses a conductive metal root support such as an aluminum plate, and on the support, for example, a photoconductive organic pigment is dispersed in a resin such as a 7-enol resin.1. Using a printing original plate comprising a photoconductive photosensitive layer, in particular a photoconductive photosensitive layer in which copper phthalonanine is dispersed in a novolak resin,
After completing the exposure step 'f' using the electrophotographic method, a silent latent image is formed on the seafood layer, which is then passed through a developing process to obtain a toner image. This is a technology in which excess toner adhering to the non-image area on the conductive photosensitive layer is passed through a rinsing step in which the excess toner is washed away using a rinsing liquid, and then the toner is transported to the next step, a fixing step using heat fixing. The present invention relates to a fixing device suitable for use in such a fixing process.

Regarding liquid development and fixing devices after rinsing using electrophotography, the support such as recording paper has conventionally been paper in most cases, and as far as the present inventors know, the support has been made of conductive material such as an aluminum plate. There are few examples in which a fixing device after liquid development and rinsing has been put to practical use when using a metal plate. Therefore, the current situation is that there are many problems associated with its practical application.

For example, the liquid developer used to form the toner image and the rinse liquid used to remove excess toner are resistant to high boiling point solvents and other heat during ffi formation. Since these substances often contain dangerous substances, bringing such substances into the heat fixing section poses a safety problem.

In addition, in both conveyance and heat fixing of the printing original plate, the toner visualization surface 1 on the photosensitive layer side of the printing original is not allowed to be scratched, but if a conventional full-surface heating roll is used, Problems include the presence of false spots on the toner image surface.

Therefore, the present invention has been made to solve the above-mentioned problems, and its first purpose is to evaporate and remove the residual solvent of the liquid developer and rinse liquid before thermal fixing. An object of the present invention is to provide a printing original plate fixing device that can ensure safety in thermal fixing.

A second object of the present invention is to provide a printing original plate fixing device that does not damage the toner image surface of the original and does not adversely affect printing performance.

Other objects of the present invention will be made clear by the following description of the unknown a1 book.

EMBODIMENT OF THE INVENTION Hereinafter, the eel thin according to the present invention will be explained based on illustrated embodiments.

FIG. 1 is a schematic vertical sectional view showing a typical embodiment of the present invention;
FIG. 2 is a sectional view showing an example of a heating roll portion.

In step J, a printing original plate 1 having a bone-conductive photosensitive layer coated on a support such as an aluminum plate is guided and conveyed to the fixing device 2 according to the present invention with the toner 131 side facing upward; Liquid development and removal r): After the residual solvent of the IJ solution is removed by evaporation, it is thermally fixed, and then guided and conveyed to the next process. That is, the structure is such that it enters the fixing device 2 according to the present invention from the left side 1 in the figure and is fed out from the right side.

Therefore, in this specification, the terms front/back, left/right, and top/bottom will be used for each member based on the transport path or trajectory of the original 1.

In front of the plate conveyance path in the main fixing device 21C, there is a drying section 3.
A fixing section 4 is provided on the rear side of the drying section 3. It is defined by a housing 6 having three MI drying units and an openable/closable lid 5, and inside the housing 6 are several sets of conveyor rolls I and an air squeezing unit B that blows out pressurized air. , forming the drying section 3. The drying section 3
For example, there are open entrances 9A and exits 9B at the front and rear ends, respectively, and the desired locations (located at the bottom of the drawing, but these are shown for convenience only). be.

) VC, evaporated residual solution/! The exhaust fan IO is connected to the exhaust fan IO for discharging the air to the outside of the thread. mJ transport roll 7 is a combination of an upper stop 110-7A and a lower roll IB. It is formed by edge conveying rolls that are configured to convey by contacting both the left and right ends 1011.

The air squeeze unit 8 is configured to be able to spray pressurized air using an air knife method, and preferably two or more are disposed along the conveyance path, and are connected to a compressor 12 serving as an air source.
It is electrically conductive. It is desirable that the temperature of the pressurized air is adjusted to a constant temperature by a hot water temperature regulator 13 using a heater as a heat source. This adjusted temperature is determined by the physical properties of the object to be removed, and by adjusting VC in this way, the removal effect of residual common media is improved and safety is ensured.

The fixing unit 4 includes a housing 15 having a chopstick rest 14 that can be opened and closed.
The inside of the housing 15 has an upper 10-rule +
The fixing unit 4 includes a plurality of sets of transport rolls 16 and a heating plate 17, each consisting of a lower roller 6A and a lower roller 16B. The fixing section 4 has an open inlet IBA and an open outlet 18B at its front and rear ends, respectively. The heat source for thermal fixing in the fixing section 4 is a heating roll provided above and/or below the plate conveyance path (using a heatable roll for the upper roll +6A and/or the lower roll 168). , and/or from the heating plate 11. That is, according to this embodiment, this method of supplying the heat source is based on the heating and conveying roll 16A and/or
Alternatively, a method of combining 16B with the 17 heating plates, a method of supplying heat only with the heating plate 17, and a method of supplying heat with only the heating plate 17, without heating the 17 heating plates and simply using them as guide plates, and applying heat only with the heating and conveying roll 16A and/or 16B. There is a way to supply In the present invention, the upper 10110-rule +6A may be formed by a heating roll, and in that case, as shown in FIG. This is desirable.

As described above, the drying section 3 and the fixing section 4 are located in each of the casings 6 and 1.
5, and each block is divided into blocks, with an outlet 9B of the drying section 3 and an inlet 18A'Th of the fixing section 4.
, are aligned and juxtaposed along the conveyance path. The drying section 3 and the fixing section 4 are further housed in an outer casing 19, and the casing 19 has an opening 20 above it, and has an opening 21A and an exit 21B in front and behind thereof, respectively. The opening 20 has a switch 22 .

The operation of the present invention having the above configuration is as follows.

Via the inlet 21A of the outer casing 19, the drying section 30A port 9A
The original plate 1 guided and conveyed from the original plate 1 is conveyed from the left direction to the right direction by the conveyance roll 7, and while it is traveling along the conveyance path, heated and pressurized air is blown from the air squeeze section 8 using an air knife method. The remaining solvent on the plate is removed by evaporation. The original plate 1 from which the residual solvent has been removed is conveyed from the outlet 9B of the drying section 3 to the inlet IBk of the fixing section 4, enters the fixing section 4, and is heated by the heating roll 16B (and/or 16
A) and/or thermally fixed by a heating plate 17;
The toner is guided through the exit 18B of the fixing unit 4 and the exit 21B of the housing 9 to the next process (for example, a cooling process). Components such as the liquefied medium evaporated in the drying section 3 are attracted by the air fan lO [and are ejected out of the yarn.

Since the present invention has the above-mentioned structure and operation, by evaporating and removing the residual solvent of the liquid developer used for forming the toner image and the rinsing liquid used for removing excess toner before performing thermal fixing, This has the effect of ensuring safety in heat fixing. 1. The printing original plate fixed by the present invention is extremely easily damaged due to its physical properties;
According to the present invention, the toner image surface of the original plate is not damaged and printing performance is not adversely affected. To be more specific, the original printing plate is placed on the printing press cylinder during printing by an automatic plate making machine, etc., but at this time, the two ends of the plate are inserted into the plate insertion part and attached. Generally, both ends of the original plate inserted into this plate insertion section are located at positions unrelated to the printing surface of the plate cylinder.

Therefore, according to the present invention, even if the edge portion is damaged by the transport roll, printing performance etc. are not affected.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional view showing a typical embodiment of the present invention;
FIG. 2 is a sectional view showing an example of a heating roll portion. In the figure, 1 is a printing original plate, 2 is a fixing device, 3 is a drying section, 4 is a fixing section, 7 is a transport roll, 8 is an air squeeze section, 16
A and/or 16B indicate h0 heat roll, +7 indicates heat plate gold. Patent applicant: Roku Konishi Photo Industry Co., Ltd. Agent: Patent attorney Nobuan Sakaguchi (and one other person)

Claims (1)

[Claims] (1) A printing original plate comprising a photoconductive photosensitive layer coated on a support, in which the printing original plate with a toner image formed on the photosensitive layer is conveyed by a conveyance roll with the toner image side facing upward. 1- In a fixing device for a printing original plate that performs fixing while fixing, the upper roll of the conveyance roll is an edge conveyance roll configured to convey the toner by contacting the left and right edges (Illll) of the toner image surface, and A printing original plate characterized in that a drying section without an air squeeze section that blows out pressurized air is provided at the front of the plate conveyance path, and a fixing section that performs heat fixing is provided at the rear side of the drying section. (2) The drying section and the fixing section are each divided into blocks, each of which is housed in a housing, and each housing has an inlet/outlet opening along the plate conveyance path that coincides with the block. The printing original plate fixing device according to claim 1, wherein the printing original plate fixing devices are arranged side by side.