| 摘要 |
<p>PURPOSE:To improve the product yield by forming an introduction section for introducing light into either of the inside of a cylinder or the inside of a cylinder head and installing a light sensing means for sensing light either on the cylinder or on the cylinder head. CONSTITUTION:Resin fed into a cylinder 12 is extruded to the side of flow path 17 of a cylinder head 13 following the rotation of a screw 11 by an extrusion device 10 and used. A plurality of transparent windows 12a with heat-and- pressure-resistant glass fixed thereon are formed on the side of, for instance, the outer periphery of the end of the cylinder 12, which forms the side of the end of the screw 11, and a light source 16 is provided on the outside of the transparent windows 12a, and a light sensing means 18 is mounted on the peripheral wall of a guide passage 17a on the cylinder head 13 side. When light is introduced from the light source 16 into the cylinder 12 through the transparent windows 12a, the light is reflected to the side of the flow path 17 of the cylinder head 13 by a reflection slope 11b of the screw 11, and the light passing through a mesh component 15 is sensed by a light sensing means 18, and when the mesh component 15 is broken, the light amount is varied.</p> |
