| 摘要 |
PURPOSE:To achieve the optimization of developing soln. concn. at all times by operating an interrupter during the generation period of the control output of a specific gravity detector to interrupt the control ouput of the specific gravity detector at a fixed period and controlling a dilute soln. feeder by the interrupted outputs thereof. CONSTITUTION:When the developing soln. concn. increases to a fixed value or more, a hydrometer 11 ascends as shown in (a) and the light emission of a light emitting element 12 is interrupted by the hydrometer 11, as a result of which a photo detector 13 generates the output corresponding to the ascending of the hydrometer 11 as shown in (b). This output is straightly inputted to an interrupter 14 as shown in (c). Thereupon, the interrupter 14 intermits its input at the specified period as shwon by (d). Hence, a solenoid 18 operates intermittently as shown by (e) to open a valve 3 intermittently as shown by (f) by the action of its rod 20, through which the dilute soln. is fed to a developing tray 3. In this way, the excessive dilution owing to the detection delay of the specific gravity detector on account of the amount of the developing soln., the capacity of the circulating line, etc. is prevented and always proper developing soln. concn. is maintained. |
