Device for guiding a bar fed in a lathe spindle

Details Device for guiding a bar fed in a lathe spindle Device for guiding a bar fed in a lathe spindle

B - Operations, Transporting

23

B

B23B 13/12 (2006.01)

Patent

CA 2289796

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.

L'invention concerne un dispositif de guidage d'une barre entre un pince-barre (15) de magazine (11) et un mandrin (18) de tour (13), qui comprend une pièce rapportée de guidage (20, 120) coulissant avec un dégagement latéral minimum dans un conduit (16), en guise de tige d'étirage du mandrin (18). La pièce rapportée (20, 120) comporte un passage axial (24) pour la barre, avec au moins une partie (26) conçue pour être traversée par la barre selon un dégagement latéral minimum. Ladite pièce (20, 120) reçoit une impulsion émanant du pince-barre (15), le long du conduit (16), en direction du mandrin. Un système de retour (28, 30, 31) est prévu pour contrôler le retour de la pièce rapportée (20, 120) à une position de départ proche d'une extrémité d'entrée du conduit, au moment de la réextraction du pince-barre hors de ce conduit.

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