JPH0740991Y2 - Silver salt copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a silver salt photographic copying machine that makes a copy by full-surface exposure, and in particular, a gas from a processor that processes exposed photographic paper by a wet method. The present invention relates to a silver salt copying machine that prevents leakage.

[Conventional technology]

Silver salt photocopier (hereinafter referred to as silver salt copier)
Is generally a positive photographic paper (positive paper) in which a light-sensitive emulsion and a gelatin film are laminated on a paper substrate. This photographic paper is directly exposed by the reflected light from the original, and the exposed photographic paper is processed in various ways. It is a copier that develops and fixes in liquid to form a copied image on photographic paper. Therefore,
This is advantageous in that the structure is simple as compared with an electrophotographic copying machine in which a photoconductor is required to form a toner image to be transferred onto a sheet.

The basic structure of the silver salt copier described above irradiates the original with light,
An optical system that exposes the reflected light onto photographic paper, a processor that develops and fixes the exposed photographic paper in a wet process using various processing liquids, a conveyance path that conveys the photographic paper from the exposure position to the processor, and a wet process And a dryer for drying the printed printing paper.

[Problems to be solved by the device]

By the way, the processor includes a plurality of processing tanks filled with processing solutions such as a developing solution, a bleaching solution, a fixing solution, and a cleaning solution. Further, the processing solutions in the respective processing tanks are controlled so as to maintain a predetermined temperature in order to stably carry out their respective chemical treatments. It is maintained at ℃. Therefore, water vapor is generated from each processing tank.

On the other hand, in the process of printing paper, when the printing paper is transferred from one processing tank to the next processing tank, the processing liquid in the previous processing tank may be mixed with the processing liquid in the next processing tank. However, this mixture may cause a chemical reaction to generate a reactive gas. For example, if the developer is mixed in the bleaching solution even a little, sulfurous acid gas (SO ₂ gas) is generated, and this sulfurous acid gas reacts with water vapor to form a sulfuric acid mist. May corrode metal surfaces.

Therefore, when these sulfurous acid gas and water vapor leak from the processor to other parts in the machine base of the copying machine, these gases enter the conveyance path or the dryer from the inlet or the outlet of the processor to cause electrical parts such as the exposure section. It may adhere to metal or metal and cause corrosion. In the winter, when water vapor adheres to the photographic paper conveyance path outside the processor, the water vapor is warm and the metal surface of the conveyance path is cold, so that dew condensation may occur on the metal surface. Then, the water surface of the transport path softens the gelatin film on the surface of the photographic paper and adheres the photographic paper to the transport path, which may prevent the photographic paper from being transported smoothly.

In order to solve the above-mentioned problems in the conventional art, it is conceivable to provide a shutter that opens and closes in the photographic paper passage of the processor, but even if such a shutter is provided, the shutter is continuously opened during continuous copying. In this open state, water vapor, sulfurous acid gas, etc. leak from the processor, so this is not a fundamental solution. Further, with this configuration, it is necessary to control the opening / closing operation of the shutter in synchronization with the supply of the printing paper,
Timing control and structure are complicated.

An object of the present invention is to provide a silver salt copying machine capable of preventing water vapor or reactive gas generated in a processor from leaking to an exposed portion with a simple configuration.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the silver salt copying machine according to the present invention exposes photographic paper with light from a light source reflected by an original,
In a silver salt copying machine that introduces exposed photographic paper into a processor having a plurality of processing tanks to perform development and fixing processing to form a copied image, the silver salt copying machine is disposed between the exposure unit and the processor. A transport path for transporting the exposed printing paper into the processor is provided, and an air flow is supplied to the transport path to supply air flow into the transport path at least from the transport path toward the processor. It is characterized in that an air supply means for forming is provided.

[Action]

According to the present invention having the above-mentioned configuration, since the air flow from the sheet conveyance path communicating with the processor to the processor is formed by the operation of the air supply unit, it is possible to confine steam or reactive gas in the processor. it can. Therefore,
It does not hinder the transportation of the photographic printing paper in the transportation path and does not corrode electrical parts or the like.

〔Example〕

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 2 shows the overall construction of a silver salt copying machine to which the present invention is applied.

This silver salt copying machine is generally regarded as a color copying machine capable of color copying, and a manuscript stand 2 made of a transparent glass plate is provided on the upper left side in the figure of the machine stand 1 having a light shielding property.
And a document cover 3 that covers the document table 2 so that it can be opened and closed. A document (not shown) is set on the document table 2 with the document surface to be copied facing downward. ing. Below the manuscript table 2, inside the machine table 1,
A pair of light sources 4, 4 for irradiating the original with light are provided.
As the light source 4, a long halogen lamp extending in the direction perpendicular to the paper surface is used, and the length of the halogen lamp is set to a dimension corresponding to the maximum size original that can be copied. . The light sources 4, 4 are provided at both end portions below the document table 2 so that light is emitted from below the left and right end portions of the document. Furthermore, on the back of each light source 4,
The reflector 5 having an arc-shaped reflecting surface is arranged in close proximity to reduce the loss of the light amount of the light source 4.

Inside the machine table 1 below the document table 2, a reflection mirror 6 is arranged in an inclined shape for changing the reflected light reflected on the document surface of the document placed on the document table 2 into a substantially horizontal direction. A lens system 7 such as a zoom lens is provided on the right side of the reflection mirror 6 so as to change the magnification and form an image.
Is provided. As a result, the optical path of the reflected light generated by illuminating the document surface from the light source 4 and reflected on the document surface is formed as shown by the broken line arrow in FIG.

The photographic printing paper 8 is supplied to the image forming position of the reflected light by the lens system 7. The photographic printing paper 8 is stored as a photographic printing paper roll 8A wound in a roll in a light-tight storage box 9 installed on the upper right side of the machine base 1, and is drawn out sequentially from the photographic printing paper roll 8A. After that, it is cut into a length corresponding to the size of the original document or its variable size by a cutter (not shown) provided in the machine base 1 and supplied to the image forming position. The photographic printing paper 8 is formed, for example, by laminating a photosensitive layer and a protective layer made of a gelatin film on a paper base material.

Immediately below the storage box 9 and immediately above the image forming position of the lens system 7, the photographic paper 8 unwound from the photographic paper roll 8A in the storage box 9 is clamped at the upper part of the machine base 1. A pair of feed rollers 10 and 10 for drawing in and feeding to the image forming position are provided in the table 1. Below the feed rollers 10 and 10, the photographic paper is cut into a predetermined size. A cutter (not shown) is provided.

At the image forming position of the lens system 7, a flat plate-shaped suction plate vertically positioned so as to face the lens system 7.
The suction plate 11 has a size capable of holding the entire area of the cut photographic paper, and a large number of small-diameter through holes (not shown) are formed on the entire surface. In addition, a plurality of suction fan motors 12, 12 are arranged on the back of the suction plate 11 so as to face the suction plate 11, for example. Then, these suction fan motors 12 are rotationally driven in synchronization with the supply of the printing paper 8 to generate a suction air flow through each through hole of the suction plate 11, so that the suction air flow causes the printing paper 8 to move. The back side is sucked onto the suction plate 11 and the printing paper 8 is sucked onto the suction plate 11.
It is designed to be held flat on top of 11. The suction fan motor 12 is driven only during the exposure for exposing the printing paper 8 held on the suction plate 11 by the light from the lens system 7, and after the exposure is completed, the suction fan motor 12 is driven. Is stopped, the photographic printing paper 8 is released from the suction and is moved downward by a transport roller (not shown).

The lens system 7 is movable in the left-right direction in the figure. Therefore, not only the same size but also the reduced or enlarged image formation is always performed on the photographic printing paper 8 held on the suction plate 11.

A partition plate 14 for partitioning the inside of the machine base 1 in the up-down direction is stretched at a central position in the machine direction in the up-down direction except for a portion immediately below the suction plate 11. A processor 20 for wet-processing the exposed photographic printing paper 8 with chemicals such as development and fixing by using various processing liquids is provided in a casing 20A inside the machine base 1 below the machine. .
In addition, in the conveying direction of the printing paper 8, the processor
A transport path 30 for introducing the photographic printing paper 8 sucked and held by the suction plate 11 into the processor 20 is disposed on the upstream side of the processor 20, and further, a processing path is provided on the downstream side of the processor 20. A dryer 40 for drying the finished printing paper 8 is provided.

The processor 20 is provided with a plurality of processing tanks 21, 21 ... Along the transporting direction of the photographic printing paper 8, and each processing tank 21 contains various processing liquids similar to those for developing a general photograph. Is filled. For example, the first processing tank 21 at the right end in the drawing on the most upstream side in the conveying direction of the photographic paper 8 is filled with the developing solution for developing the exposed image, and the second processing tank 21 adjacent to the developing solution. Is filled with a bleaching solution, and the third processing tank 21 adjacent thereto is filled with a fixing solution for fixing an image. Each processing tank 21 is copied onto the exposed photographic paper 8. Various processing liquids for forming an image are filled according to the processing order. Further, two cleaning tanks 21 for cleaning the photographic paper 8 that has passed through the processing tanks 21 and has undergone the processings of development, bleaching and fixing.
A and 21A are provided, and each cleaning tank 21A is filled with a cleaning liquid such as tap water. Furthermore, each processing tank
21 and each treatment tank 2 inside the machine stand 1 behind each cleaning tank 21A.
Controllers 22 for maintaining the treatment liquid in 1 and each cleaning tank 21A at a predetermined temperature and for checking the liquid level are respectively provided.

The conveying path 30 for conveying the photographic printing paper 8 between the suction plate 11 and the processor 20 is arranged between a plurality of pairs of conveying rollers 31, 31 for nipping and conveying the photographic printing paper 8 and the conveying rollers 31 of each pair. It is constituted by a plurality of guide plates 32 which are provided to guide the photographic printing paper 8. The photographic printing paper 8 can be smoothly transported by these transport rollers 31, 31 and the guide plate 32.

The dryer 40 is for drying the photographic printing paper 8 that has passed through the processor 20, and the inside thereof has a predetermined high temperature and low humidity atmosphere by a heater (not shown). Further, a discharge port 41 for discharging the dried printing paper 8 is formed in the machine base 1 on the downstream side of the dryer 40.

FIG. 1 shows the details of the transport path 30. In this transport path, after the photographic paper 8 is sucked onto the suction plate 11 and exposed,
A plurality of pairs of the conveying rollers 31A, 31A: 31B, 31B: 31C, 31C: 31D, 31D for conveying the photographic printing paper 8 to the processor 20;
A plurality of parallel guide plates 32A, 32A: 32B, 32B: 32C, 32C: 32D, 32D provided between the rollers 31 of each pair are arranged. Of these, the transport rollers 31A, 31A on the entrance side are for introducing the exposed photographic paper 8 into the transport path 30, and the photographic paper 8 introduced into the transport path 30 by these transport rollers 31A, 31A. Is transported in the transport path 30 along the guide plates 32, 32 by driving each transport roller 31, and is supplied into the first processing tank 21 of the processor 20. Note that the processor 20 has a casing 23 constituting the processing tank 21 that blocks the conveyance path 30, and the photographic printing paper 8 is introduced into the processor 20 through an introduction port 24 formed in the casing 23. It has become.

By the way, in the present embodiment, a fan motor 33 as an example of an air supply means for supplying an air flow into the transport path 30 is disposed on the guide plate 32C of the transport path 30. The fan motor 33 has an opening formed on the guide plate 32C side. In this embodiment, the fan motor 33 is always driven by connecting the outlet of the copying machine to an external power source, regardless of whether the main switch is ON or OFF.

Next, the operation of this embodiment having the above-described configuration will be described.

First, in order to perform copying by the above-mentioned copying machine, a document is to be copied on the document table 2, the document surface is placed face down, the document cover 3 is closed, and the size of the copied image is not shown on the keyboard key. Press to set, and then press the start button (not shown). Then, the photographic paper 8 pulled out from the photographic paper roll 8A in the storage box 9 by the feed rollers 10 and 10 is cut into a predetermined length by a cutter (not shown), and the cut photographic paper 8 is a suction plate 11 at an exposure position. Supplied in front of. Then, the suction fan motors 12 are driven to suck the air in front of the suction plate 11 from the through holes of the suction plate 11 to suck and hold the printing paper 8 on the front surface of the suction plate 11 in a planar manner. Immediately after the photographic paper 8 is adsorbed, each light source 4 emits light for a predetermined time required to expose the photographic paper 8 to illuminate the original surface of the original placed on the original table 2 and reflect it. The light is imaged on the photographic paper 8 held by the suction plate 11 via the reflection mirror 6 and the lens system 7, and the entire surface of the photographic paper 8 is exposed. After this exposure, the drive of each suction fan motor 12 is stopped, the photographic printing paper 8 is introduced into the conveying path 30 by its own weight, and is fed from the original conveying path 30 to the processing tanks 21, 21, ... After being formed, the photographic printing paper 8 is dried by the dryer 40, and then discharged.
Taken out from 41.

By the way, in the present embodiment, the airflow from the fan motor 33 is supplied into the conveyance path 30 by driving the fan motor 33. As a result, an air flow in the same direction as the conveyance direction of the photographic printing paper 8 is formed in the conveyance path 30 on the downstream side of the guide plate 32C to which the fan motor 33 is attached, and on the other hand, on the upstream side of the guide plate 32C. An air flow in the opposite direction to the conveyance direction of the photographic printing paper 8 is formed in the conveyance path 30. As a result, the reactive gas such as water vapor and sulfurous acid gas generated from the processing liquid of the processor 20 does not leak from the processor 20 into the transfer path 30 due to the air flow flowing in the transfer path 30 toward the processor 20. Therefore, water vapor or reactive gas does not adhere to the transport path 30 or the exposed portion, and it is possible to prevent corrosion of the electric components. Further, since the air flow is always formed in the transport path 30,
It is prevented that the photographic printing paper 8 is adhered in the transportation path 30 due to the dew condensation in the transportation path 30 and the transportation of the photographic printing paper 8 becomes unstable.
Further, since the fan motor 33 continues to be driven regardless of whether the main switch of the copying machine is ON or OFF, it is possible to prevent dew condensation due to the temperature difference between day and night.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary. For example,
The air supply means may be composed of a compressor and a nozzle connected to the compressor, and compressed air may be supplied from the nozzle into the conveyance path. In addition, an air supply unit may be provided in the dryer to prevent vapor and reactive gas from entering the dryer. Further, the air supply means may be arranged on the most upstream side of the transport path.

[Effect of device]

As described above, according to the present invention, since the air supply means can form the air flow from the transfer path toward the processor equipped with the processing tank in which water vapor or reactive gas is generated, the transfer path or the exposure section can be provided. There is no invasion of water vapor or reactive gas, and it is possible to prevent corrosion of these parts, and it is possible to prevent defective conveyance of the printing paper in the conveying path due to the air flow.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an essential part showing an embodiment of a silver salt copying machine according to the present invention, and FIG. 2 is an overall configuration diagram of the silver salt copying machine of FIG. 1 ... Machine stand, 2 ... Document stand, 4 ... Light source, 6 ... Reflection mirror, 7
... Lens system, 8 ... Printing paper, 11 ... Adsorption plate, 20 ... Processor, 21 ... Processing tank, 30 ... Conveying path, 31A to 31D ... Conveying roller,
32A to 32D ... Guide plate, 33 ... Fan motor, 40 ... Dryer.

Claims (1)

[Scope of utility model registration request] 1. A silver salt copy in which a photographic printing paper is exposed by light from a light source reflected by an original, and the exposed photographic printing paper is introduced into a processor equipped with a plurality of processing tanks for development and fixing processing to form a copied image. In the machine, a transport path is provided between the exposure section and the processor for transporting the photographic paper exposed by the exposure section into the processor, and an air flow in the transport path is provided in the transport path. A silver salt copying machine characterized in that an air supply means for forming an air flow from the transfer path toward the processor at least is provided in the transfer path.