| 摘要 |
<p>A positioning unit for use with a printing unit comprises a base 14, at least one rear column 17 and at least one arm member 18. The at least one rear column 17 is attached to the base 14 and the at least one arm member 18 is mounted to the rear column 17. The arm member 18 comprises means for removably mounting a printing unit and configured to move between a first position and a second position. The arm member 18 comprises parallel motion means 22 configured to maintain the printing unit in a position substantially parallel to the base 14 when the arm member 18 is moved from said first position to said second position.</p> |
