JPS6349760A - Photographic film drying device - Google Patents

Abstract

PURPOSE:To properly dry a film and to reduce a cost by controlling the quantity of electric power supply to a heater according to outside temperature, outside humidity, and film processing area per unit time. CONSTITUTION:A film detector 32 is provided nearby the conveyor roller 20A of an automatic developing machine 10 and detects the film area S of an inserted film 19 to be processed per unit time. When the film 19 is inserted, data on the outside temperature, outside humidity, and film area S are read in a microcomputer 38 from sensors 34 and 36, and the detector 32 after preheating and the necessary drying temperature T in a drying chamber 18 is calculated from an arithmetic expression stored in a ROM 48 based on said data. Here, the temperature T is compared with the actual temperature t2 in the drying chamber and the heater 26 is turned on and off to obtain the temperature T, thereby performing drying properly and reduce the cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic film drying apparatus, and particularly to a photographic film drying apparatus used in a drying chamber of an automatic processor.

[Conventional technology]

In a photographic film drying device used in the drying chamber of an automatic processor, when the i source of the automatic processor is turned on, the fan and heater installed in the drying chamber are turned on to heat the interior of the drying chamber. There is.

In this case, regardless of the temperature and humidity of the outside air, the air taken in from the air intake is heated by a heater to lower the relative humidity, and the heated air increases the temperature of the film to be dried so that it contains moisture. Air is vented outside the machine.

[Problem that the invention seeks to solve]

However, when drying film using such equipment, in order to replace the air on the film surface regardless of the temperature and humidity of the outside air, a heater that can handle the maximum amount of film processed per unit time is required. and a fan is required,
There was a problem that the device was large and the cost was high.

An object of the present invention is to solve the above problems and provide a photographic film drying device that can maintain a necessary and sufficient drying level with minimum energy (heater temperature and drying air volume) by controlling the required drying temperature of the drying chamber. The purpose is to provide.

[Means for solving problems]

The photographic film drying apparatus according to the present invention includes an outside air temperature sensor that detects the temperature of outside air taken into the drying chamber;
An outside air humidity sensor that detects the humidity of the outside air, a means for detecting film area per unit time that is inserted into the developing machine, a heater that heats the outside air taken into the drying chamber by a fan, and outside air temperature and outside air humidity. and a control means for controlling the amount of power supplied to the heater based on the film area processed per unit time.

[Effect]

Since the drying conditions are determined based on the temperature and humidity of the environment that governs film drying and the amount of film inserted per unit time, the heater capacity can be reduced and the drying air volume can be reduced, making the drying equipment smaller and cheaper. can be made to

〔Example〕

Embodiments of the photographic film drying apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of an automatic developing machine 10.
The interior thereof includes a developing section 12, a fixing section 14, a washing section 16, and a drying chamber 18. Conveying rollers 20 are continuously disposed at each of these portions at approximately constant intervals, forming a path for the photographic film 19. The conveyance roller 20 disposed between the outlet of the water washing section 16 and the entrance of the drying chamber 23 is a squeeze roller that squeezes a portion of the water adhering to the photographic film 19. The respective conveying rollers 20 are connected by a chain or belt (not shown) and are driven to rotate simultaneously, and this driving is performed by a motor 21. A film receiving box 22 is provided at the discharge portion of the photographic film 19, and the photographic film 19 that has been processed is stored therein. The drying chamber 23 is equipped with a temperature detection sensor 50 for detecting the temperature inside the drying chamber. Further, an air intake duct 24 and an exhaust duct 30 are connected to the drying chamber 23, and a heater 26 and a fan 28 are arranged inside the air intake duct 24, so that the outside air sucked into the air intake duct 24 is heated and dried. The moist air sent into the chamber 23 to dry the photographic film 19 and the roller 20 is discharged to the outside through an exhaust duct 30. A plurality of film detectors 32 are arranged in the width direction of the film near the transport roller 20A arranged on the insertion side of the photographic film 19, and detect the area of the inserted photographic film 19. It is supposed to be done. Further, an outside air temperature sensor 34 and an outside air temperature sensor 36 are arranged on the side surface of the casing.

The outside air temperature sensor 34 and the outside air temperature sensor 36 are connected to the input side of an analog switch 42, and are connected to an input port 40 of a microcomputer 38 via an A/D converter 44. Further, the output of the temperature detection sensor 50 in the film drying chamber is connected to the input side of the analog switch 42. Film detector 32 is connected to input port 40. Motor 21. The heater 26 and fan 28 are connected to the output side of a driver 46, and the driver 46 is connected to an output port 47 of a microcomputer 38.

Next, the software configuration of the microcomputer 3B will be explained with reference to FIG.

When the automatic developing machine 10 is turned on, the program starts. 1. Initially, in step 100, the heater 26
, the fan 28 is controlled on and off to preheat the inside of the drying chamber 23.

Next, the process proceeds to step 102, in which it is determined based on the signal from the film detector 32 whether the photographic film 19 has been inserted into the automatic developing device 1110. If the determination is negative, the process returns to step 100. In case of affirmative judgment, step 10
4, the A yW degree data from the outside air temperature sensor 34 and the outside air temperature sensor 36 and the film surface 413 data from the film detector 32 are read.

Next, in step 104, the temperature T of the drying chamber necessary for drying the film is calculated from the data values read. This calculation formula is stored in the ROM 48 in advance.

Next, this calculation formula will be explained.

The required drying temperature T is the outside air temperature [1, the outside air absolute humidity f (,
It is determined by the wind speed V of the air passing through the fan 28, the area of the photographic film 19 passing through the drying chamber 23 per unit time, and the moisture 51r attached to the conveying roller 20.

Here, the wind speed V is determined by the type of automatic development ITO. The outside air absolute humidity H is determined by the outside air relative humidity and the outside air temperature t. Further, the amount of moisture r adhering to the photographic film 19 and the transport roller 20 in the drying chamber 23 is determined by the area (S) of the film dried per unit time.

The film drying level L is determined by the moisture content of the film immediately after the drying process, the temperature, the surface condition of the film, etc., and since it varies depending on the type of film, it is expressed by the following formula.

L-'I(h,t+)+fz(S)+T+K...+
11 Here, K is a value specific to the dryer, and is a constant determined by the drying wind speed, etc. Therefore, the required drying temperature T is expressed by the following function.

Transforming equation (1), T = f + (h, t +) + It (S) + (L-K) -
(21 Therefore, the required drying temperature T is T=F (h, t, V, W)...
(3) This equation (3) is experimentally determined depending on the model of the automatic processor 10 and is stored in the ROM 48.

In addition, if the film area S is constant inside the film,
The film length l can be used instead. Alternatively, the required drying temperature T may be calculated by detecting the absolute humidity H of the outside air instead of the relative humidity of the outside air.

Next, in step 112, the detected temperature data t8 from the temperature sensor 50 inside the dryer is read, and in step 114, the required drying temperature T and 1N are compared.

If T≠t2, the process proceeds to the next step 116, where the on/off control of the heater 2G is performed according to the value of the required drying temperature T.Next, the process proceeds to step 118, where the photographic film 19 is transferred to the automatic processor 10 according to the signal from the film detector 32. Determine whether it has been inserted into. If the determination is affirmative, the process returns to step 104 and repeats the above process.
, then skip step 116 and proceed to step 118.

In addition, in step 106, the outside air temperature 1, the outside air relative temperature h, and the film area S read in step 104 are used.
If the value has not changed from the value previously read in step 104, the process jumps from step 106 to step 112, and the heater 26 is controlled on and off at the same required drying temperature T.

In step 118, if the photographic film 19 is not detected, the process proceeds to step 120, and the processes of steps 112 to 120 are repeated until a certain period of time has elapsed.
As a result, the heater 26 is kept at the same required drying temperature T until the drying process is completed for the entire length of the photographic film 19.
is controlled on and off. When the drying process is completed for the entire length of the photographic film 19, the process returns from step 120 to step 100 and repeats the above process.

Note that instead of on/off control, the power supplied to the heater 26 may be changed using a triac or the like.

〔Effect of the invention〕

In the photographic film drying apparatus according to the present invention, the outside temperature t,
Since the amount of power supplied to the heater is controlled according to the outside air relative humidity or outside air absolute humidity H and the film area S, the photographic film can be dried appropriately, and the structure inside the drying chamber is simplified and costs are reduced. It has the excellent effect of being cheaper.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an automatic processor to which an embodiment of the present invention is applied, and FIG. 2 is a flowchart of a microcomputer 38. lO...Automatic developing machine 12...Developing section 14...Fixing section 16...Washing section 18...Drying chamber 19...Photographic film 20...Transport roller 32...Film detector 34...Outside air temperature sensor 36...Outside air temperature sensor

Claims (1)

[Claims] An outside air temperature sensor that detects the temperature of the outside air taken into the drying chamber, an outside air humidity sensor that detects the humidity of the outside air, a means for detecting film area per unit time that is inserted into the developing machine, and a fan that is used to detect the outside air that is taken into the drying room. A photographic film drying apparatus comprising: a heater that heats outside air; and a control means that controls the amount of power supplied to the heater based on outside air temperature, outside air humidity, and film area processed per unit time. .