JPH0342653B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to the production of a copy film (roll duplication film) from a master film (original roll film, with an image taken on a silver halide film or diazo film). It is used to make a film (film), and in particular, a master film wound around a supply roll and an unexposed diazo film wound around a supply roll are brought into close contact with each other, exposed, and then developed. The present invention relates to a developing section of an exposure and developing apparatus for diazo photography.

(Prior art) In the conventional method, a master film wound around each supply roll and an unexposed diazo film are brought into close contact with each other on a transfer drum for exposure, and then the exposed diazo film is led to a developing chamber and developed. The diazo photographic exposure and development apparatus will be explained with reference to FIG. 3, which is a front view of the entire apparatus. In the figure, 1 is a master film supply roll, 2 is an unexposed diazo film supply roll, and 3 is a contact film. The transfer drum is a free roll that transfers the two films wound on the supply rolls 1 and 2, which are superimposed and brought into close contact with each other, while supporting the film on its circumferential surface. Reference numeral 4 indicates a predetermined position near the circumferential surface of the transfer drum 3. 5 is a master film winding roll;
7 is a developing section for developing the exposed diazo film; 7 is a winding roll for the developed diazo film; 8 is an auxiliary brake roll whose surface is covered with rubber or felt;
9 is a rubber-covered main brake roll such as a powder brake that is made to slide to obtain torque; 10
11 is a rubber-covered main drive roll driven by a motor, 11 is an auxiliary drive roll with a rubber or felt surface, 12 is a clutch-type drive take-up shaft, and 13 is a free roll that changes the direction of film travel. It is used. 15 is a master film (indicated by a solid line); 16 is an unexposed film; 17 is an exposed film; 18 is a developed film (indicated by a chain line); and 20 is a light source, such as a high-pressure mercury lamp.

During operation, the master film take-up roll 5, the developed film take-up roll 7 and the main drive roll 1
0 is driven, and the master film 15 wound around the supply roll 1 is exposed while being rewound and passes between the transport drum 3 and the light source unit 4 via various rolls 13, 8, and 9. It is wound up on a take-up roll 5. On the other hand, the unexposed diazo film 16 wound around the supply roll 2 is transferred to the free roll 1.
3, the master film 15 is overlapped on the underside (inside) of the master film 15 in front of the transport drum 3, and is transported over the circumferential surface of the transport drum 3 in close contact with the master film 15, where it is exposed. After passing through the transfer drum 3, it is separated from the master film 15 again, guided through the free roll 13 through the entrance/exit 6a to the developing section 6, where it is developed, and then exits the entrance/exit 6a again to be wound onto the take-up roll 7. It will be done.

4 and 5 are sectional views showing a developing section similar to the developing section 6 in the apparatus shown in FIG. FIG. 5 is a sectional view taken along the - line in FIG. 4. In the figure, the developing chamber 21 has a heater 22 attached to the back side (the right wall surface in FIG. 4), and a vertical partition plate 23 is provided at a distance a from the top of the heater 22. Gaps b and b are provided at both the upper and lower ends of the front side (left side in Fig. 4).
A large number of guide rolls 13 are provided near both upper and lower ends of the roller. Further, an axial fan 25 is provided above the heater 22 and is driven by an external motor. Note that 24 in the figure indicates an entrance/exit for the film 18.

The exposed diazo film 18 introduced into the developing chamber 21 from the entrance 24 is transported to the guide roll 13.
The inside of the developing chamber 21 is
Ammonia gas heated by the heater 22 is passed by the fan 25 between the heater chamber (the right chamber in FIG. 4) h and the film chamber (the left chamber in the same figure) f, which are separated by the partition plate 23, into the gap a , b, and are forced into circulation.

However, since ammonia gas is lighter than air, and the fan 25 is installed in the upper part,
The downward airflow generated by the fan 25 is warmed by the heater 22 and moves against the rising airflow, weakening the forced circulation flow. In addition, resistance when passing through the gaps a and b is added, and the airflow is heated by the heater 22 and moves upward. Also, there was a fear that the uniform heating effect of ammonia gas was not being performed effectively.

Further, when the film in the developing chamber is stopped for replacing the master film roll, etc., a temperature difference occurs in the developing chamber, and the temperature is highest near the fan 25 (90 to 100 degrees Celsius), followed by the guide roll 13. It has been confirmed that the temperature is high (85 to 90°C) near the base, and the lowest temperature is near the guide roll at the bottom.
When the upper part of the developing chamber reaches an abnormally high temperature as described above, the diazo film has the drawback of causing abnormal color development and, in some cases, deformation. For this reason, conventionally, when the film is placed on a guide roller in the developing chamber and stopped, the film in the developing chamber is cut off and thrown away, which is not easy to operate and is also uneconomical.

(Problems to be Solved by the Invention) The present invention eliminates the drawbacks of the prior art described above, and
The heating effect within the developing chamber is uniformly and positively effective, and even when the diazo film is stopped, the upper part of the developing chamber can be prevented from becoming abnormally high temperature, thereby preventing any adverse effects on the film. It's about doing.

(Means for Solving the Problems) The present invention provides a heater as a developing section that protrudes into the developing chamber from the back side of the developing chamber, and a heater that is placed at a distance from the protruding top of the heater and placed inside the developing chamber. A first partition plate in the vertical direction is provided to leave a gap at both the upper and lower ends, and a second partition plate in the horizontal direction extending from the lower end of the first partition plate to the back side is provided, and a lower part of the front surface of the developing section is provided. A fan is installed near the bottom of the developing section to draw in developing gas and blow it out to the heater area through a small hole formed in the second partition plate, and a fan is installed near the top and bottom ends of the front side of the first partition plate, respectively. The apparatus is characterized in that a plurality of guide rolls are provided, and the exposed diazo film introduced into the developing chamber near its lower end is caused to meander by the guide rolls and then sent out to the outside.

(Function) The present invention is configured as described above, so that
The ammonia gas in the developing chamber is heated by the heater, creating an upward flow, and from this upward flow and the fan installed near the bottom of the developing chamber,
The direction of the flow blown upward through the small opening of the second partition plate is the same, and there is no resistor on the suction side of the fan that would narrow the flow path, so the forced circulation flow by the fan flows smoothly. No temperature difference occurs within the developing chamber.

Therefore, even if the film is stopped in the developing chamber while being hung on the guide roll for reasons such as replacing the master film roll, the temperature difference within the developing chamber can be minimized, and the upper part of the developing chamber This prevents the film from reaching an abnormally high temperature, thus preventing abnormal color development or deformation of the diazo film.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 are cross-sectional views of a developing section showing an embodiment of the present invention, which replaces the developing section in the conventional diazo photographic exposure/developing apparatus shown in FIG. A sectional view taken along the - line in FIG. 2,
FIG. 2 is a sectional view taken along the - line in FIG. 1,
Among the symbols shown in these drawings, the same symbols as those in FIGS. 4 and 5 indicate the same or similar parts. In the figure, 32
3 is a heater provided protruding from the rear surface of the developing chamber 31 (the right side wall in FIG. 1);
and a heater chamber h; 34 is a horizontal second partition plate extending from the lower end of the first partition plate 33 to the rear surface of the developing chamber; 35 is a second partition plate; A fan, such as a Sirotskov fan, is provided below and sucks ammonia gas (developing gas) from the film chamber f partitioned by the first partition plate 33 and blows it out into the heater chamber h through the small hole 36 of the second partition plate. .

The exposed diazo film 18 introduced into the developing chamber 31 from the entrance 24 is transported to the guide roll 13.
The point that the image is developed with ammonia gas while being meandered by the image forming apparatus is the same as in the conventional example (Figs. 4 and 5), but in this example,
In the heater chamber h in the developing chamber 31, ammonia gas heated by the heater 32 becomes lighter and naturally rises. On the other hand, the ammonia gas in the film chamber f is sucked from below by the fan 35 provided below, and is blown upward through the small hole 36 of the second partition plate 34 into the heater chamber h, and is then blown into the heater 32. It is then heated again and circulated.

In this way, the direction of the forced circulation flow caused by the fan 35 and the direction of the natural upward flow caused by the heater match, and the blowing flow path from the film chamber f to the fan 35 is configured to be wide, so that there is no resistance. Since there is no temperature difference, the above-mentioned forced circulation effect is promoted and no temperature difference occurs in the developing chamber.

Therefore, even if the film is stopped in the developing chamber while being hung on the guide roll for reasons such as replacing the master film roll, the temperature difference within the developing chamber can be minimized, and the upper part of the developing chamber This prevents the film from reaching an abnormally high temperature, thus preventing abnormal color development or deformation of the diazo film.
Therefore, since the next master film can be exposed without any change, work efficiency (time and effort) can be greatly improved.

Although the ammonia gas supply port to the developing chamber is not described in the above embodiment, for example, an ammonia gas supply pipe may be inserted through the outer wall toward the left side of the lower heater 32 in FIG. The opening at the tip is located near the heater 32. Therefore, the supplied ammonia gas is quickly heated by the heater.

(Effects of the Invention) As explained above, according to the present invention, the developing chamber is separated into a film chamber, a heater chamber, and a suction passage by a vertical first partition plate and a horizontal second partition plate, and the fan is By providing the lower part of the second partition plate, the suction flow path of the fan can be formed wide, and it also matches the direction of natural convection caused by the heater, so that the heated developing gas is smoothly and strongly forcedly circulated by the fan. As a result, the temperature distribution inside the developing chamber becomes uniform from top to bottom.

Therefore, even if the film is stopped on the guide roll in the developing chamber, the upper part of the developing chamber can be prevented from becoming abnormally high temperature, and since the temperature difference between the upper and lower parts of the chamber is extremely small, the color development of the diazo film can be prevented. No abnormality or deformation occurs. Therefore, the next master film can be exposed without any change, and work efficiency can be greatly improved.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of a developing section of a diazo photographic exposure and developing apparatus showing one embodiment of the present invention, FIG. 1 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 3 is a front view showing a main part of a conventional diazo photographic exposure and developing apparatus in cross section, and FIGS. 4 and 5 are sectional views of a conventional developing section. DESCRIPTION OF SYMBOLS 1... Master film supply roll, 2... Unexposed diazo film supply roll, 3... Contact film transport drum, 4... Light source unit, 5... Master film winding roll, 6... Developing section, 7
...Developed diazo film winding roll, 13...
...Guide roll, 31...Development chamber, 32...Heater, 33...First partition plate, 34...Second partition plate,
36...small hole, 35...fan.

Claims (1)

[Claims] 1. A master film supply roll, an unexposed diazo film supply roll, an exposure section that exposes the master film and the unexposed film in close contact with each other, a master film take-up roll after the exposure is completed, and a vertically long part that develops the exposed diazo film. In a diazo photographic exposure and development apparatus comprising a developing section using ammonia gas and a developed diazo film take-up roll, a heater is provided as the developing section and protrudes into the developing chamber from the back side of the developing chamber, and the heater protrudes. A vertical first partition plate is provided at a distance from the top of the developing chamber to partition the inside of the developing chamber by leaving a gap at both the upper and lower ends, and a horizontal partition plate extends from the lower end of the first partition plate to the rear surface of the developing chamber. A second partition plate is provided in the direction, and the developing gas at the lower front of the developing chamber is sucked in and
A fan blowing air into the heater area from a small hole bored in the partition plate is provided near the bottom of the developing chamber, and a plurality of film guide rolls are provided near both upper and lower ends of the front side of the first partition plate, respectively. A diazo photographic exposure and development apparatus characterized in that the exposed diazo film introduced into the developing chamber from near its lower end is caused to travel in a meandering manner by the guide roll and then sent out to the outside.