Device for feeding bars

Abstract

An apparatus (1) for feeding bars (2) to a machine tool, comprising: a rotating drum (3) provided with a plurality of guide units (4) distributed circumferentially and extending parallel to a longitudinal axis (AL); each guide unit (4) consists of two parts (4A, 4B) which can be moved back and forth and opened by means of the respective bar (5) in order to internally receive the respective bar (2) to be advanced to the machine tool; an actuator element (6) arranged to act directly on a particular lever (5) each time to open a corresponding guide unit (4), and a support assembly (7) adapted to receive and support a plurality of bars (2) in a position adjacent to the drum (3); a loading unit (GL) comprising a lifting device (8) movable from a lower position (P1) to an upper position (P2) to pick up one or more bars (2) from the support assembly (7) and lift the bars (2) to the upper position (P2); the loading unit (GL) further comprises a selector unit (GS) for selecting a single bar (2) at a time when the lifting device (8) is in said upper position (P2) in order to effect a transfer of said bar to the respective guide unit (4).

Description

technical field [0001] The invention relates to a device for feeding bars to machine tools, in particular to automatic lathes. Background technique [0002] Different devices are known for automatically feeding bars onto the spindle of a lathe. [0003] In general, the bar feeding device comprises a rotating drum rotatable about its horizontal longitudinal axis and supporting a plurality of guides adapted to receive and guide the individual bars to be fed to the aforementioned lathe. [0004] The rod feed unit is provided with a loading mechanism for loading the rods, which consists of a flat surface on which the rods rest, and slides that move vertically and support articulated supports that remove rods one at a time and is lowered to release the rods to specific guides of the drum placed below. [0005] The articulated supports are driven by suitable control members which move the articulated supports from a holding position, in which they prevent the lifted bars from fa...

AI Technical Summary

Problems solved by technology

[0012] The first disadvantage is usually brought about by the high structural and functional complexity of the bar loading mechanism

[0013] Moreover, the screw-nut system used to drive the pushing equipment and the lubrication circuits necessary to ensure correct operation are structurally complex, expensive and demanding from an operational and maintenance point of view

[0014] An additional disadvantage is the structural and functional complexity of the mechanism for opening the guide with several hinged levers

[0015] Finally, disadvantages arise in the guide units, which do not always ensure the correct advancement of the rods, especially in the case of rods with a greatly reduced diameter relative to the inner section of the guide units, which often Get stuck at the last section facing the lathe

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