| CPC B29C 45/60 (2013.01) [B29C 45/5008 (2013.01); B29C 45/62 (2013.01); B29C 45/74 (2013.01); B29C 64/209 (2017.08); B29C 64/314 (2017.08); B33Y 10/00 (2014.12); B33Y 40/10 (2020.01)] | 15 Claims |
|
1. A plasticizing device, comprising:
a motor;
a screw assembly, the screw assembly being configured with:
a reduction gear coupled to a rotation shaft of the motor to rotate around the rotation shaft, the reduction gear being configured to reduce a rotation speed, the reduction gear having an output shaft at a distal end thereof, the output shaft being located at an opposite side of the reduction gear with respect to the motor;
a screw support component disposed at the output shaft of the reduction gear; and
a flat screw disposed at an opposite side of the screw support component with respect to the reduction gear, the flat screw having a groove forming surface in which a spiral groove is formed and that rotates around a rotation axis by the output shaft of the reduction gear, a length of the flat screw in a first direction along the rotation axis is less than a length of the flat screw in a second direction perpendicular to the rotation axis;
a barrel that has a facing surface facing the groove forming surface along the first direction and that is provided with a communication hole through which a plasticizing material flows, the plasticizing material being obtained by plasticizing material pellets;
a material reservoir that stores the material pellets;
a passage port that receives the material pellets from the material reservoir via a pipe connected between the material reservoir and the passage port;
a heater that heats the material pellets supplied into the spiral groove; and
a screw case that accommodates the screw assembly and that includes the passage port through which the material pellets pass toward the flat screw, wherein
when viewed along the second direction, the flat screw has a first side surface in which a supply port for supplying the material pellets to the spiral groove is partially formed in a circumferential direction of the first side surface, and a second side surface formed on a side farther from the barrel than the first side surface,
there is a space between the second side surface and an inner surface of the screw case,
a first distance, which is a shortest distance between the first side surface and the inner surface of the screw case, is larger than a second distance, which is a shortest distance of the space between the second side surface and the inner surface of the screw case, and
in the first direction, a first length of the passage port provided on the inner surface of the screw case is smaller than a second length from an upper surface of the barrel to a most closest point of the space.
|