JPH03291652A - Photosensitive material drying device for developing device - Google Patents

Abstract

PURPOSE:To uniformize the temp. distribution in a drying rack by using a ceramics hot wind heater as a heater for forming hot wind. CONSTITUTION:The ceramics heater 34 is disposed below the drying rack 104 which heats the blast from a fan and forms hot wind. The plural ceramics heaters 100 are juxtaposed in this ceramics hot wind heater 34. The respective heater 100 is formed by passing this heater respectively perpendicularly through plural aluminum sheets 101 disposed in parallel with each other as one block and juxtaposing these blocks. The respective heaters 100 are provided with power source supply terminals 100A and the plural aluminum sheets 101 constitute the fins for uniformizing the temp. distribution as heat sources. The tungsten heaters are embedded into the ceramics of the respective heaters 100. Thereby the heater 34 have the characteristics that the heaters attain a specified temp. in the fast rising state regardless of the difference in the resistance and do not increase the temp. any more when the specified temp. is attained. The temp. distribution of the drying rack 105 is uniformized in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photosensitive material drying device for a developing device, which is disposed behind a photosensitive material transport line of a developing device and is used to dry a developed photosensitive material.

[Conventional technology]

The drying device used in the developing device is designed to introduce hot air through a heater from below the film transport rack.

FIG. 5 is a schematic configuration diagram showing an example of such a device. A drying rack 1 for guiding the photosensitive material F is housed in a machine frame 1A, and hot air is supplied from below the drying rack 1 by a blower 2. The blower 2 is supplied with outside air through a nichrome wire heater 3 in advance.

FIG. 6 shows another example in which outside air is supplied to the blower 2, a nichrome wire heater 3 is interposed between the blower 2 and the drying rack 1, and the nichrome wire heater of the drying rack 1 is A radiant heat shielding plate 4 is provided on the third side surface.

[Problem to be solved by the invention]

However, in the above-mentioned technique, for example in the case of FIG. 5, the nichrome wire heater 3 generates a high amount of radiant heat, so it must be placed far away from the blower 2 so as not to adversely affect the drying rack 1 side. It won't happen.

For this reason, it becomes necessary to provide a separate location for the nichrome wire heater 3, and the nichrome wire heater 3
It is necessary to provide a long air pipe for guiding the outside air from the air to the air blower 2, which is not sufficient in terms of achieving compactness.

Under these circumstances, the one shown in FIG.
It is designed to be more compact. However, since the radiant heat shielding plate 4 for shielding radiant heat is provided, the flow of hot air is complicated, the efficiency of the air is poor, and a uniform temperature distribution within the drying rack 1 cannot be achieved. Furthermore, since the sensor S is also far from the heat source, the temperature also becomes non-uniform. Furthermore, since the nichrome wire heater 3 is placed directly below the drying rack 1, it is not sufficient in terms of safety.

In consideration of the above facts, the present invention aims to provide a highly safe photosensitive material drying device for a developing device that can be made compact and uniform in temperature distribution.

[Means to solve the problem]

The present invention is a photosensitive material drying device for a developing device in which warm air is guided through a heater from below a photosensitive material transport path, and the heater is characterized in that the heater is a ceramic hot air heater.

[Effect]

According to the photosensitive material drying device for a developing device configured as described above, a ceramic hot air heater is used as the heater for forming hot air. This ceramic hot air heater has a characteristic that the surface temperature during heat generation is, for example, 2.
The temperature is extremely low at around 20°C. Therefore, the amount of radiant heat is extremely low, and there is no need to provide a radiant heat shielding plate as in the past. Therefore, it is no longer necessary to place obstacles that greatly obstruct the flow of hot air, and it becomes possible to equalize the temperature distribution within the drying rack.

Furthermore, since the surface temperature during heat generation is low, it can be safely placed close to the drying rack, making it possible to make it more compact.

〔Example〕

FIG. 1 shows a developing device 12 incorporating a film drying device 10 embodying the present invention.

The basic configuration of this device is as an example
No. 258.

The outside of the developing device 12 is covered with a frame 14 to block all light from the outside world.

The frame 14 includes a plurality of processing tanks 20 extending vertically.
．． 22. 24. 26. 28. 30. 32 are formed, and each is partitioned by a standing wall 33 which is a part of the frame. The processing tank 20 is filled with a developing solution, the processing tank 22 is filled with a bleaching solution, the processing tank 24 is filled with a fixing solution, the processing tanks 26 and 28 are filled with washing water, and the processing tank 30 is filled with a stabilizing solution.
A heater 34 and an air blower 35 are arranged below 2 to form a hot air supply means, and hot air is sent upward.

Further, a guide roller 36 is provided below each type 20 to 32 and on each standing wall 33, and a guide 37 corresponds to the guide roller 36 with a predetermined gap. Furthermore, various 20
Sprockets 38 are installed above and below 32, and a belt 40 for transporting the film is connected to these sprockets 38.
It is suspended to.

The belt 40 is endless and has many protrusions (not shown) formed on its inner surface, and a motor (not shown) is connected to the sprocket 3.
Rotate 8 to rotate counterclockwise. Furthermore, a plurality of protrusions 52 are formed on the outside of the belt 40 at predetermined intervals.

On the other hand, the film 42 is in the cartridge 4 in a wound state.
It is housed in 6. The leader 48 is a flexible synthetic resin sheet that is slightly more rigid than the film 42, and has a plurality of square holes (not shown) along the longitudinal direction of the center. The film 42 is conveyed by engaging these square holes with the protrusions 52 of the belt 40.

A film supply device 54 is installed on the upper entrance side of the developing device 12 (left side in FIG. 1), and each cartridge 46 containing a film 42 connected to a leader 48 at the tip can be placed therein. . The leader 48 and the film 42 are connected to the film conveyance belt 40 of the processing tank 20 by conveyance rollers 60.
sent to.

The leader 48 and the film 42 are turned downward from the supply device 54 by the guide 37, and the square hole of the leader 48 fits into the protrusion 52 of the belt 40, and the film 42 descends once inside the processing tank 20, and is moved downward by the guide roller below. After passing between 36 and guide 37, it is reversed and conveyed upward.

Further, since guide rollers 36 and guides 37 are provided above the standing wall 33, the leader 48 and the film 4
2 is turned downward again and sent to the next processing tank 22.

In this way, the leader 48 and the film 42 pass through each of the processing tanks 20 to 32, and the film 42 undergoes color development, bleaching, and
Fixing, washing, stabilization and drying processes are performed. The leader 48 and film 42 that have completed each process reach the film stacking device 64.

Next, the film drying device 10, which is the main part of this embodiment, will be explained.

In this drying apparatus 10, a drying rack 105 is inserted between the vertical walls 33. As shown in FIG. 4, in this drying rack 105, like other processing tanks, an endless conveyor belt 40 is wound around sprockets 38 arranged at the top and bottom, respectively, and drives a leader 48, thereby transporting the film 42 approximately in the It is designed to be conveyed along a letter-shaped trajectory.

The drying rack 105 has side plates 105A arranged on both sides of the movement trajectory of the film 42 to create a hot air passage between the film 42 and the standing wall 33, and allows hot air to flow into the drying rack through openings 105B formed at regular intervals above and below. , and the film 42 is applied to the film 42.

The lower end of the side plate 105 is closed with a bottom plate 105C. The bottom plate 105C has a substantially triangular shape with a central portion protruding downward. An opening may be formed in this bottom plate 105C to serve as a hot air passage.

Below this drying rack 105 is a ceramic heater 34.
is arranged to heat the air blown from the fan 35 and turn it into warm air. A sensor S is placed directly above this heater 34.

As details of the ceramic hot air heater 34 are shown in FIG. 2, for example, three ceramic heaters 100 are arranged in parallel, and each ceramic heater 100 has a plurality of aluminum plates 101 arranged in parallel with each other. The blocks that pass through each at right angles are called "-blocks" (1200W), and two of these blocks are arranged side by side. Each of the ceramic heaters 100 is provided with a terminal 100A for supplying power, and the plurality of aluminum plates 101 constitute fins serving as a heat source to equalize temperature distribution. Each ceramic heater 100 has a tungsten heater embedded in ceramic and fired.

The ceramic hot air heater 34 having such a configuration is
As shown in the graph of FIG. 3, regardless of the difference in resistance, each temperature rises quickly to a constant temperature, and once the temperature reaches a constant temperature, it does not rise any further. Further, in this example, the surface temperature is also extremely low, and its value is approximately 220°C.

As explained above, according to this embodiment, the ceramic hot air heater 34 has a characteristic that the surface temperature during heat generation is extremely low. Therefore, the amount of radiant heat is extremely low, and there is no need to provide a radiant heat shielding plate on the drying rack side as in the past. Therefore, it is no longer necessary to place obstacles that greatly obstruct the flow of hot air, and it becomes possible to equalize the temperature distribution within the drying rack.

Furthermore, since the surface temperature during heat generation is low, it can be safely placed close to the drying rack, making it possible to make it more compact.

Table 1 shows the measured temperatures in comparison with the temperature distribution at points Tl-T6 in FIG. 4 according to this embodiment with the case where a conventional nichrome wire heater is arranged in the configuration shown in FIG. 6. In this specific example, the ceramic heater is 1200W x 2, and the fan air volume is 8m'/
The power of the Nikrok wire heater is 2400W, and the airflow rate of the fan is 3m'/min. Condition 1 had a large number of holes at the top of the drying rack (28 holes), and Condition 2 had a small number (14 holes). Further, in this specific example, temperature control was performed at 60°C. According to this, the maximum temperature difference is 18°C with a nichrome wire heater because it is affected by radiant heat, whereas
In the present invention, the temperature is 7°C, which is extremely small. Also, since the temperature is not high at point T1, that is, at the bottom of the drying rack,
An opening may be provided to 05C. On the other hand, with the nichrome wire heater, the temperature at the 01 point is too high, so if an opening is provided in the bottom plate 105C, the film will be damaged. Furthermore, in the case of the nichrome wire heater, the bottom plate 105C reaches a temperature of 90° C. or more, so it is difficult to control it with a temperature sensor at the bottom of the rack.

Table 1 (1) [Effects of the Invention] As is clear from the above explanation, the photosensitive material drying device for a developing device according to the present invention can be made more compact, can make the temperature distribution uniform, and can improve safety. Has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a film drying device to which a photosensitive material drying device for a developing device according to the present invention is applied, and FIG. 2 is a ceramic hot air blowing device applied to a film drying device for a developing device according to the present invention. A configuration diagram showing an example of a heater,
FIG. 3 is a graph showing the characteristics of the ceramic hot air heater, FIG. 4 is an enlarged sectional view showing a drying section, and FIG. 5.6 is a sectional view showing a conventional example. 34...Ceramic hot air heater, 35...Blower, 80...Plate member, 100...Ceramic heater, 101...Aluminum material. 2 3rd figure 549- figure 5 figure 5

Claims (1)

[Claims] (1) A photosensitive material drying device for a developing device in which hot air is guided through a heater from below a photosensitive material transport path, the heater being a ceramic hot air heater.