JP2726181B2 - Electrophotographic plate making device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic plate making and developing apparatus for developing a charged and exposed printing plate material in a wet developing step of an electrophotographic plate making machine.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional wet electrophotographic plate making / developing apparatus performs development by flowing a charged and exposed plate material while flowing a developing solution from a nozzle 2 between two electrode plates 1. The used developer is collected in a lower receiving tray 4, returned to a toner tank (not shown), sent to a nozzle 2 again by a pump, and circulated. Excess developer adhering to the developed printing plate material is removed by the squeeze roller 3. However, unevenness of the liquid is left due to the carry-in of the developer from the gap between the rollers, and the unevenness of the processing is caused by these. Is generated. The air knife 5 is used to prevent the squeeze roller 3 from being installed near the exit side of the squeeze roller 3.
A high-speed squeeze wind (approximately 15 m / sec) is continuously blown from the air knife 5 to the printing plate immediately after the printing plate 3 has exited, so as to eliminate uneven liquid wetting.

[0003]

As described above [0006], the processing unevenness of development With air knife can be solved, the surface of the liquid wetting the squeeze roller attached dried by air knife squeezing air in one There are problems such as toner peeling, soiling the printing plate material, and evaporating the toner solvent from the circulating developer to change the concentration, thereby failing to obtain stable quality.

[0004] The present invention has been made from the above-described circumstances, an object of the invention is, while retaining the function of the air knife to prevent processing unevenness of development, the Rukoto to control the blowing time of the squeeze-style Adheres to the surface of the squeeze roller
An object of the present invention is to provide an electrophotographic plate-making and developing apparatus capable of performing stable development with high quality while preventing drying and peeling of the developing solution and reducing evaporation of the developing solution.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a wet developing device for an electrophotographic plate making machine, and an object of the present invention is to develop a charged and exposed plate material and apply the plate material to the plate material.
The excess developer that has adhered was removed with a squeeze roller.
After that, squeeze style is blown from air knife to make uneven
In an electrophotographic plate-making and developing apparatus for removing liquid wetting,
The squeeze roller is moved to the rear end of the plate material developing section by the developer.
Place the air knife near the squeeze
The printing plate is arranged with the outlet facing the outlet side of the roller.
The leading end of the material advances in the developing section, and the squeeze roller
ON the air blow to the air knife at a predetermined position close to
After the rear end of the plate material passes through the squeeze roller
A blower control means for turning off the blower at a predetermined position;
Is achieved.

[0006]

[Function] Electrification that is intermittently conveyed into the developing unit at a constant speed ,
The leading end of the exposed printing plate material is provided near the rear end of the developing section.
Position and rear end approaching the squeeze roller
At a predetermined position after passing through the roller,
ON / OFF control of the air supply to perform short-time air supply
Prevents the developer adhering to the squeeze roller from drying off
At the same time, the amount of evaporation of the developer is suppressed.

[0007]

FIG. 1 is a schematic configuration diagram for explaining an embodiment of the present invention. Inlet outside near <br/> country first plate material detection sensor 6 of the developing unit described in FIG. 3 in FIG. 1, also the outlet outside of the developing unit
A second plate material detection sensor 7 is disposed near the side, and a blower 9 based on information from these sensors 6 and 7.
Is provided. Also,
The squeeze roller 3 is disposed near the rear end of the developing section,
-The knife 5 has the outlet of the squeeze roller 3
It is arranged toward the exit side. During the operation time of the plate making machine, when the exposed plate material is conveyed and reaches near the entrance of the developing section, the first plate material detection sensor 6 detects the leading edge of the plate material. And outputs a detection signal to the blower control unit 8. The blower control unit 8 detects that the printing plate material is in the first position from the time of detecting the leading edge of the printing plate material.
After a lapse of a predetermined time that is shorter than the time during which the distance L between the plate material detection sensor 6 and the squeeze roller 3 is conveyed.
Is turned ON. After the development, the excess developer is removed by the squeeze roller 3 and the printing plate material that has exited the roller 3 is subjected to the squeeze wind of the air knife 5 to correct uneven liquid wetting.
Rear end of the printing plate material transported while passing through the air knife
A detection signal by detecting the second plate material detection sensor 7 is sent to the blower control unit 8, the blower control unit 8 OFF blower 9
And In this way, the air knife 5 is controlled to generate a squeeze wind only for a necessary time . Note that 13
Is a blower installed near the outlet of the air knife 5
9 is a blowing pressure sensor.

In the above embodiment, the case where two plate material detection sensors are used to detect the position of the plate material has been described.
It is also possible to control air blowing using a plate material detection sensor. That is, the leading and trailing ends of the plate material passing therethrough are detected by the first plate material detection sensor 6, and respective detection signals are output to the blower control unit 8. The blower control unit 8 turns on the blower 9 after a lapse of a predetermined time shorter than the time during which the plate material is conveyed by the distance L from the time of detection of the leading end, and switches the first plate material from the time of detection of the rear end. The same air blowing control can be performed by turning off the air blower 9 after a lapse of a predetermined time longer than the time of transporting the distance between the detection sensor 6 and the air knife 5.

[0009] Figure 2 shows another embodiment, generation of the squeeze air, without in ON chromatography OFF blower stop, blower and still be operated miss blown from the blower to the other processing exhaust duct 11 And the opening and closing of the switching valve 12 controls the air blowing to the air knife 5 . In this case, the opening and closing operation of the switching valve 12 is performed by a command of the switching valve control unit 10 based on the detection information of the plate material detection sensor 6 as in the above-described embodiment. When the blower control to the air knife 5 is directly performed by turning the blower ON and OFF, the squeeze wind is immediately generated even if the blower switch is turned OFF due to the inertia of the blower and the capacity in the blower and the blower duct. It does not stop and continues until the internal pressure decreases, and when the blower is started, the generation of the whirlwind wind is delayed.
Therefore, when sharp control cannot be performed and the cycle time of plate material conveyance is short, the effect is particularly large. Control by a switching valve improves this problem.

[0010] Reduces trouble caused by evaporation of developer
However, one example is squeeze style.
From the surface of the squeeze roller and the pan below the developing unit.
The amount of toner liquid emitted is 4 ml / min at a liquid temperature of 30 ° C.
It was about. Assuming that the processing time of one page version is 15 seconds / plate,
During that time, the liquid evaporation by the squeeze wind is 1 ml / plate.
You. Now consider the case of processing 30 pages per page per hour.
And the evaporation amount in the apparatus of the present invention is 30 ml.
Compared to 240 ml of evaporation when blowing wind continuously
It will be reduced by 90%.

[0011]

As described above, according to the apparatus of the present invention, the leading end of the charged and exposed plate material contacts the squeeze roller.
From the specified position, the rear end of the printing plate material moves the squeeze roller
The squeeze roll is required for a short period of time
Squeeze wind toward the exit side of the
The developer attached to the squeeze roller.
Is suppressed and the plate material can be cleaned.
In both cases, the amount of evaporation of the toner solvent from the developer decreases and the density changes.
Development of stable quality.
It can be carried out.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional wet electrophotographic plate making and developing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode plate 2 Nozzle 3 Squeeze roller 4 Receiving tray 5 Air knife 6 First plate material detection sensor 7 Second plate material detection sensor 8 Blower control unit 9 Blower 10 Switching valve control unit 11 Exhaust duct 12 Switching valve 13 Pressure sensor

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akihiro Kanazawa 1005 Kozono, Ayase-shi, Kanagawa Fuji Micro Graphics Co., Ltd. (56) References JP-A-58-80658 (JP, A) JP-A-2- 103075 (JP, A) JP-A-3-203755 (JP, A) JP-A-3-123663 (JP, A) JP-A-61-5945 (JP, A) JP-A-58-85462 (JP, A) JP-A-4-141667 (JP, A) JP-A-4-141167 (JP, A) JP-A-4-350877 (JP, A) JP-A-1-149667 (JP, U)

Claims (1)

(57) [Claims] 1. A method for developing a charged and exposed printing plate material, comprising the steps of:
Use a squeeze roller to remove excess developer adhering to
After that, squeeze style is blown from air knife to make it uneven
Electrophotographic plate-making and developing equipment that removes
The squeeze roller is placed behind the plate material developing section with the developing solution.
Near the edge and the air knife
With the outlet facing the exit side of the roller.
The leading end of the plate material advances in the developing section, and the squeeze low
At the predetermined position close to the
N, the rear end of the plate material passes through the squeeze roller
After that, a ventilation control means for turning off the ventilation at a predetermined position is provided.
Electrophotographic plate making developing device is characterized in that there was example.