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Photographic chemical mixing system

  • US 4,165,186 A
  • Filed: 11/15/1976
  • Issued: 08/21/1979
  • Est. Priority Date: 11/15/1976
  • Status: Expired due to Term
First Claim
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1. A photographic chemical mixer for supplying premixed chemical solution to a film processing unit, or the like, comprising:

  • a fluid holding tank for said pre-mixed chemical solution;

    low level sensing means in said tank for detecting a preset low fluid level in said tank;

    high level sensing means in said tank for detecting a preset high fluid level in said tank;

    liquid supply means for adding diluting fluid to said tank which fluid is designed to be mixed with a concentrate to provide said pre-mixed chemical solution;

    control means associated with both said sensing means and said liquid supply means, and including indicating means operably connected with said low level sensing means for indicating the attainment of said low fluid level;

    means for selectively activating said liquid supply means; and

    means operably associated with said high level sensing means for deactivating said liquid supply means when said high fluid level in said tank is reached; and

    reservoir means adapted to contain a quantity of said pre-mixed chemical solution, said reservoir means being operably connected with said tank such that upon the liquid level in said tank reaching said low fluid level, said reservoir means will feed its premixed solution to continue the supply of said pre-mixed chemical solution to a processing unit without interruption, by maintaining the liquid level of said pre-mixed solution in said tank at said low fluid level for a period of time, with the retention of said low fluid level by said reservoir means serving to maintain a desired volumetric difference between said low and high fluid levels, to replenish said pre-mixed chemical solution, in said tank to said high fluid level said means for selectively activating said liquid supply means is operated to add said diluting fluid to the tank to be mixed with a pre-packaged concentrate added within said tank, said tank being filled to said high fluid level automatically to replenish the supply of pre-mixed chemical solution at the desired strength, said replenishing of the chemical solution being attained without the necessity of an operator having to measure said diluting fluid or commence the replenishing operation immediately upon attainment of said low fluid level.

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