Accurate dosing of regenerating fluid to processing-fluid-tank in film developing machine

US4263932A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Erwin Laar · Taufkirchen, DE
• Werner Sieber · Riehen, CH
• Josef Spickenreither · Munich, DE

Key dates

• Filing date: Aug 30, 1978
• Grant date: Apr 28, 1981
• Expiry date: Aug 30, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86196
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The film developing machine includes a tank containing developing fluid, to which a dosing device continually adds regenerating fluid received from a regenerating-fluid supply tank. To prevent the gradual emptying of the supply tank from producing an accuracy-reducing gradual decrease in the pressure applied to the input side of the dosing device, the latter is connected to the supply tank via a buffer vessel provided with an internal valve mechanism serving automatically to keep the volume of regenerating fluid in the buffer vessel substantially constant despite variations in the amount of regenerating fluid contained in the supply tank.