| 摘要 |
<p>A cutter head (10) having blade unit mounting cavities (28) with spaced-apart mounting points (148, 150, 160) and a blade unit (24). Each blade unit (24) has at least one blade edge (38) and is configured to have the blade edge (38) disposed to align with the blade edge (38) of another blade unit (24) each in other mounting cavities (28). This forms a substantially helical blade when each blade unit (24) is secured adjacent at least one of the spaced-apart mounting points (148, 150, 160).</p> |
