| 摘要 |
1. Device for accurately controlling the simultaneous lowering and raising of tracing tools (9) which plot longitudinal strokes on a glass band (2) moving longitudinally on a suitable support, said device being constituted by a carrying bar (8), placed perpendicularly to the axis of the glass band and parallel to the plane of said band, on which bar are suitably positioned tracing tools integral with the tool holder (7, 12), the assembly tool-tool holder (9, 7, 12) being integral with an arm (14) pivoting about an axis (22) connected via a lifting jack (18) to a tool holding carriage (19), characterized in that the assembly tool-tool holder (9, 7, 12) integral with the arm (14) is also mounted for pivoting about an axis swivelling about an eccentric shaft (17) mounted on the tool holding carriage (19), placed perpendicularly to the axis of the band (2), and driven in rotation by a quarter turn or half turn by an automatically controlled motor (27) working in stepwise and reversable fashion, the relative position of the two axes controlling the position of the hinged arm (14), hence of the tracing tool (9) being such that, for one of the position of the eccentric shaft (17), the tracing tool (9) touches the surface of the glass band (2) and that, for the other position, the tracing tool (9) is at a distance of about one millimeter from the said surface. |
