Bar feeding apparatus for automatically feeding bars to machine tools, in particular for feeding bars having different diameters

摘要

The bar feeding apparatus (10) for automatically feeding bars to at least one spindle of a machine tool, comprises a rotating drum (12), a plurality of openable front guides (15) for guiding the bars, disposed circumferentially on the drum (12), rear supporting means (16) for supporting the bars, disposed on the drum (12) in alignment with each front guide (15), pre-forwarding means (20) for pre-forwarding the bars in correspondence with the rear supporting means (16), a plurality of elongated pushing members (27) for pushing the bars, and lifting means (28) for lifting the bar-pushing members (27); the pre-forwarding means (20) for pre-forwarding the bars comprise a forwarding member (20) selectively connectable to a drive motor (21) to slide parallel to the drum (12) along the rear supporting means (16), while each of the bar-pushing members (27) is shaped to engage with and disengage from a respective bar-forwarding member (20).