| 摘要 |
<p>The apparatus comprises a frame with a marking implement (15) and at least one carriage (14) that slides relative to two guides (12, 12'). A first guide (12) is located in an aperture (16) in the carriage and consists of a sliding bearing (18) in a sleeve of a solid polymerisable resin. The other guide (12') is held against the carriage by a support (22) that allows for transverse movement. The support, in the form of an elastic element or a forked arm, creates a gap (V) that receives the second guide.</p> |
