JPS6262363A - Automatic developing device - Google Patents

Abstract

PURPOSE:To make it possible to correct difference between set temperature of processing solution and temperature of processing solution in the processing tank automatically and exactly by correcting detection output signals of temperature of solution in a temperature regulating tank basing on temperature detection output signals of solution in the processing tank. CONSTITUTION:Processing solution S in a processing tank 1 is sent to a temperature regulating tank 3 by a pump 2, and after regulation returned to the tank 1 and circulated. A thermistor 4 and a heater 5 are provided in the tank 3. Output of the thermistor 4 is A/D converted 6 and made to signals corresponding to temperature of solution T1 in the tank 3 and given to a correcting section 7. Output of a thermistor 8 in the tank 1 is A/D converted 9 and inputted to the correcting section 7 as a signal that corresponds to temperature of the solution T2 in the tank 1. Set temperature T0 of a setting section 10 is inputted to the correcting section 7 and control section 11. The correcting section 7 finds out the difference T3 of T0 and T2 and further calculates T1-T3. The control section 11 makes the heater 5 on when T0>T1-T3, and makes the heater 5 off when T0<T1-T3 to control temperature of the solution. Thus, temperature of the processing solution is kept at T0 at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an automatic developing apparatus for developing silver halide photographic materials and the like, which has a processing liquid temperature control device for maintaining the processing liquid temperature at a predetermined temperature. [Prior Art] An automatic developing device that processes silver halide photographic light-sensitive materials such as photographic film and photographic paper is usually equipped with various processing tanks such as development, fixing, and water washing, and the photosensitive materials to be processed are transferred to these processing tanks. The material is sequentially passed through and processed, then dried in a drying section and discharged outside the machine as a processed photosensitive material. Figure 2 shows automatic development! The photosensitive material to be processed is inserted through the insertion port 21 and placed in the developing tank 2.
2. After sequentially passing through a fixing tank 23 and a washing tank 24, it is discharged outside the machine through a drying section 25. Each processing tank is filled with a different processing solution, but in order to keep the characteristics of the processed photosensitive material appropriate and constant, it is necessary to control and maintain the temperature of each processing solution, especially the developer solution, at a constant level. 6 To control the temperature of the processing liquid, a temperature control means such as a heater and a liquid temperature detection means (sensor) are installed in the processing tank.The sensor detects the temperature of the processing liquid in the tank and controls the temperature control means. A method for keeping the temperature of the processing liquid at a predetermined value, and a temperature control tank equipped with a temperature control means and a liquid temperature detection means separate from the processing tank, and sending the processing liquid in the processing tank to this temperature control tank. Mainly used is a method in which a processing liquid whose temperature is controlled in a temperature-controlled tank is circulated to the processing tank. Although the former method of installing a direct #C blade temperature means in the processing tank requires a simple device, it has the disadvantage that the temperature inside the processing tank is not uniform and errors occur in the detected temperature depending on the installation position of the sensor. The latter method, which uses a temperature-controlled tank, allows for more precise control. Japanese Patent Publication No. 60-115938 discloses an apparatus in which temperature setting and control in the temperature control system as described above are performed using digital signals in order to more accurately control the temperature. [Problems to be Solved by the Invention] The above-mentioned method using a temperature control tank allows for accurate temperature control because the temperature of the liquid in the processing tank is uniform and the control response is quick. Since the temperature is inside the temperature control tank, there is a slight difference from the actual temperature inside the processing tank, and this needs to be corrected. Conventionally, the second correction has been performed by actually measuring the temperature of the processing liquid in the processing tank and adjusting a correction variable resistor provided in the temperature control circuit. However, when adjusting with a variable resistor, it is difficult to read the correction amount, and corrections must be made while measuring the temperature of the processing liquid in the processing tank.
For reasons such as the amount of adjustment and the rotation angle of the variable resistor being unstable, and the variable resistor having temperature drift, it took a long time to make the adjustment, and it was difficult to make accurate corrections. It is an object of the present invention to provide an automatic developing device that can easily and accurately perform temperature correction, which solves the above-mentioned adjustment problems. J. To provide a liquid temperature control device. [Means for Solving the Problems 1] As a result of various studies, the inventor of the present invention found that the above objective was to control the temperature of the processing solution in the processing tank of an automatic developing device by having a temperature control means provided separately for the processing solution. The temperature of the processing liquid is controlled by circulating the temperature in a heated tank, and the temperature of the processing liquid is maintained at a predetermined temperature by controlling the temperature control means, which is also used as an output signal from a processing liquid temperature detection means provided in the temperature control tank. In an automatic developing apparatus equipped with a control device, the processing liquid temperature control device digitizes an output signal of a processing liquid temperature detection means provided in the temperature control tank;
A processing liquid temperature detection means provided in the processing tank, a means for digitizing an output signal of the processing liquid temperature detection means provided in the processing tank, and an output of the processing liquid temperature detection means provided in the processing tank. This article describes what can be achieved by an automatic developing apparatus characterized by having a correction calculation means for correcting the output signal of the processing liquid temperature detection means provided in the digitalized temperature control tank. This led to the invention. In the apparatus of the present invention, the control temperature correction amount of the processing liquid in the temperature-controlled tank is also determined by the temperature of the processing liquid in the processing tank measured by a temperature detection means provided in the processing tank, for example, a temperature sensor such as a thermistor. Since the temperature is automatically determined and correction is made at the same time, the temperature in the temperature control tank is always controlled to the optimum condition so that the temperature of the processing liquid in the processing tank reaches the predetermined set temperature. Further, since all data processing such as correction calculations in this process is performed in a digital state, it can be easily and accurately performed using various known arithmetic circuits. In addition, since the control temperature of the temperature control tank is automatically corrected as described above, the control device can be adjusted to a predetermined temperature depending on the use.
! ! The operation is extremely simple, requiring only the liquid temperature to be input directly. In addition, in the device of the present invention, the temperature of the processing liquid in the temperature control tank and the temperature of the processing liquid in the processing tank are compared during the automatic control process, so if the difference between these two temperatures becomes larger than a certain limit. It is also possible to add a means to issue an alarm indicating that an abnormality has occurred in the temperature control system. The processing liquid temperature control device of the present invention can be used in any one or more automatic developing devices. ! ! Can be installed in the tank,
. The apparatus of the present invention will be specifically described below with reference to Examples, but the embodiments of the present invention, the method of correction calculation, etc. are not limited thereto. [Example] Figure @1 is a block diagram showing an example of a processing liquid temperature control device of the present invention. Note that the means for transporting the photosensitive material is omitted in the figure. The processing liquid S in the processing tank 1 is transferred to the temperature control tank 3 by the pump 2.
The water is sent to the temperature controlled post-treatment tank 1 for circulation. The temperature control tank 3 is provided with a thermistor 4 as a liquid temperature detection means and a heater 5 as a temperature control means. The output of the thermistor 4 is converted by the D converter 6 into a digital signal corresponding to the liquid temperature T in the temperature control tank, and then input to the calculation correction section 7. An in-processing tank thermistor 8 is provided in the processing tank 1, and its output is input to the t&correction calculation section 7, which converts it into a digital signal corresponding to the processing liquid temperature T2 in the processing tank by a ^/D converter 9. . Reference numeral 10 denotes a setting unit for inputting a temperature set value to be maintained for the processing liquid, and the set temperature T0 is input as a digital signal to a control unit 11 for controlling ON/OFF of the correction calculation unit 7 and the heater 5.
is input. The correction calculation unit 7 calculates the set temperature T0 and the processing liquid temperature T in the processing tank.
2, find the difference T, = T, -T, and further calculate the temperature T in the temperature control tank.
, -T, is calculated and sent to the control unit 10. The control unit compares the set value T0 with the values of T and -T, and determines that To>TI
At -T3, the heater 5 is turned on. At T+-72, the heater 5 is turned off to control the liquid temperature. By doing this, the liquid temperature in the temperature control tank 3 becomes T 0+ T! Therefore, the temperature of the processing liquid in the processing tank is always maintained at the set temperature T. In addition, in the apparatus of this embodiment, as shown in the figure, the correction section compares the temperature T1 in the temperature control tank and the temperature T2 in the processing tank T, -T.
2 exceeds a certain temperature, the control unit 1 detects an abnormality in the temperature control function.
1 to activate a temperature control abnormality alarm 12. C Effect of the invention] In the automatic developing apparatus of the present invention, it is possible to automatically and accurately correct the difference between the set processing liquid temperature and the processing liquid temperature in the processing tank, and it is possible to input the required processing liquid from the set value input means. It is now possible to set the processing conditions in the processing tank extremely efficiently and reliably by simply inputting the temperature.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of an automatic developing device according to the present invention, and FIG. 2 is a schematic sectional view showing an example of the automatic developing device.

Claims (1)

[Claims] The temperature of the processing liquid in the processing tank of the automatic developing device is controlled by circulating the processing liquid in a separately provided temperature control tank having a temperature control means, and the processing liquid temperature detection means provided in the temperature control tank. In the automatic developing apparatus, the processing liquid temperature control device is equipped with a processing liquid temperature control device that controls the temperature adjustment means to maintain the processing liquid at a predetermined temperature based on an output signal from the temperature control tank. means for digitizing the output signal of the processing liquid temperature detection means provided; processing liquid temperature detection means provided in the processing tank;
means for digitizing the output signal of the processing liquid temperature detection means provided in the processing tank; and a means for digitizing the output signal of the processing liquid temperature detection means provided in the processing tank; An automatic developing apparatus comprising a correction calculation means for correcting an output signal of a processing liquid temperature detection means provided in a hot tank.