Patent GB-1093249-A (GB)
Title: Dry cleaning system
IPC: D06F43/08
Filed: 1964-12-22
Abstract: 1,093,249. Dry-cleaning apparatus. HUPP CORPORATION. Dec. 22, 1964 [Dec. 23, 1963], No. 52022/64. Heading D1A. A dry-cleaning system controlled by timer means comprises a chamber 6 in which articles are cleaned, connected to a solvent storage tank 22 by conduit means including a condenser 32, a pressure responsive actuator 59 being provided, having a pressure tube 58 whose inlet is between condenser 32 and a restricted part 57 of the conduit, which actuator deactivates the timer when the flow of liquid exceeds the capacity of part 57 and reactives the timer when the flow of liquid is less than the capacity of part 57, means responsive to actuator 59 being provided to stop the system if the liquid flow through part 57 is less than its capacity during a predetermined portion of the drying operation. The dry cleaning chamber 6 has a door 7 and contains a perforated tumbling and spinning rotor cage 8 driven by a two-speed gear mechanism 13 controlled by solenoid 14. Paddles 8a on cage 8 agitate and vaporize unvaporized solvent. The vapours are drawn off by blower 27 and are forced through solenoid controlled valve 29 to condenser 32 and thence through heated chamber 37 and solenoid controlled valve 41 back to the chamber 6. During cleaning, the solvent is fed from tank 22 by pump 102 through nozzle 108 into chamber 6, the surplus solvent flowing through conduit 109 to tank 110 from which it is pumped through filter 113 into tank 22. Solvent may also be pumped from tank 22 into the bottom of chamber 6 by pump 102 when valve 116 is suitably set. Valve 118 in conduit 109 may be closed manually chamber 6 being connected to tank 110 by overflow through pipe 120 so that a pool of solvent forms in chamber 6. When the vapour is to be recovered during drying, cooling water is passed through the coil 33 of condenser 32 and instead of vapour passing to heated chamber 37, the condensed solvent passes through duct 48 and filter 49 to separator column 52. The water, which floats on the perchlorethylene, overflows through drain 53 and the solvent passes on into a tube 56 from which the restricted orifice 57 leads into tank 22. Tube 58 connects tube 56 to bellows 59 so that, when the solvent accumulates in tube 56, the increased pressure opens normally closed switch 61 to stop the timer. When the work is dry and the flow of solvent decreases, the switch 61 closes. During the deodorization and cooling of the contents of tumbler 8, it rotates at slow tumbling speed, and blower 27 is energized and solenoids 31, 42 are de-energized to allow flapper valves 29, 41 to seal off chambers 32, 37 and thus vent chamber 6 to the open air. Door 8 is unlocked only by solenoid 132 at the end of the cycle or by a key. Operation of the apparatus is initiated by a coin operated switch 66 which energizes the timer motor 86 which rotates timer drum 68. The drying cycle comprises a timed part, during which the timer drum 68 continues to rotate and an untimed part controlled by switch 61 which continues until the work is dry. During the timed part of the drying cycle, at a selected stage, if switch 61 does not open, as a result of some failure in the drying circuit, coil 148 is energized to attract blade 152 which opens contact 154 to cut off power to the machine through timer drum 68 and at the same time closing contact 156 to form a holding circuit for coil 148 and operating an audible or visible alarm 158.