| 摘要 |
<p>A roller (1061, 1062) positioning apparatus having first and second roller supports (1071, 1072). First and second rollers (1061, 1062) are carried by the first and second roller supports (1071, 1072). A first shaft (1063), having right and left hand threads (1063(a), 1063(b), axially positions the first and second rollers (1061, 1062) while the first shaft (1063) rotates. A second shaft (1066) coupled to the first and second roller supports (1071, 1072) operates as a linear guide therefor and when the second shaft is rotated the rollers (1061, 1062) rotate.</p> |
