| 摘要 |
A device for guiding a bar between a collet (15) of a magazine (11) and a mandrel (18) of a lathe (13) comprises a guiding insert (20, 120) which slides with a minimum of side clearance within a duct (16) constituting the mandrel drawrod (18). The insert (20, 120) has an axial passage (24) for the bar with at least one section (26) designed to be traversed by the bar with a minimum of side clearance. The insert (20, 120) is impelled by the collet (15) along the duct (16) towards the mandrel. Return means (28, 30, 31) are provided to control return of the insert (20, 120) to a starting position close to an inlet end of the duct upon re-extraction of the collet from the duct. |
