| 摘要 |
<p>The apparatus comprises needle beam means, which carry needle boards, needle beam guide means for vertically guiding said needle beam means, needle beam drive means for imparting an up and down motion to said needle beam means, balancing weight means associated with said needle beam means, balancing weight guide means for vertically guiding said balancing weight means, and balancing weight drive means for imparting to said balancing weight means an up and down motion in phase opposition to said needle beam means.</p> |
