| 摘要 |
PURPOSE:To provide the hopper of which fitting to the long hole portion of a cylinder and manufacturing are easy by using the plastic adapter having the sectional curvature successively changed toward an upper part from a lower part. CONSTITUTION:A hopper 5 is composed of the plastic adapter 3 of which sectional curvatures are successively changed into larger circles from oblong shapes toward an upper portion 3'' from a lower portion 3', and the upper hopper member 4 with circular section. The resin feeding inlet of a cylinder 1 is a long hole 6 with a oblong shape, and the upper hopper member 4 has a circular sectional shape. But the adapter 3 is injection molded, and in said adapter, its curvatures are changed successively and smoothly from the lower part (X1-Y1) 3' with a oblong shape to the upper (X5-Y5) 3'' with a circular shape, thereby causing its manufacture to be easy compared to the former process in which a metal plate is worked. |
