| 摘要 |
PURPOSE:To avoid to be resonated to a low frequency which might cause a hauling phenomenon delivered from floor and wall through making the sectional area of a guide-bar which horizontally delivers the arm into channel-shape. CONSTITUTION:An arm 21 is guided with a channel-shaped guide bar 23 via a roller 22 formed into a spool and moved in parallel. The sectional area of the top 24 of a channel-shaped guide bar 23 is circular and polished in parallel with high frequency quenching. The minimum resonance frequency of the guide bar 23 is about 122Hz and the bar is not resonated to low frequency (20Hz-100Hz) oscillation which might cause hauling phenomenon. |
