| 摘要 |
PURPOSE:To prevent pulsative discharge so that uniform discharge is carried out in a screw feeder having an number threads, by constituting such that the area of the dicharge port end part of the feeder is gradually increased over minimum 1/n pitches in the discharge port end. CONSTITUTION:A rectifying means comprising 4 thread coils is disposed in the vicinity of the discharge port end of a feeder, and the discharge end port part 6 of a screw 3 is faced to the discharge port end so that the area of the discharge port end part 6 is gradually decreased. In this arrangement, in the case of providing n screw threads, the area is gradually decreased over 1/n pitches. With this arrangement pulsative discharge which has been unavoidable to conventional screw feeders may be prevented, and therefore, uniform discharge may be made. |
