A vertical membrane storage system including a flexible membrane housing having an upper enclosed portion capable of storing a fluid and a lower open portion for receiving the fluid is disclosed. These sequences encode antigens which react immunologically with antibodies present in individuals with non-A non-B hepatitis, but which are absent from individuals infected with hepatitis A virus, or hepatitis B virus, and also are absent in control individuals. Once the chain is broken, an abnormal rotational speed of the winding shaft is detected by the rotational speed detecting module, the control circuit switches off the power source immediately to make the brake mechanism lock the winding shaft.