Guide-bar device for multi-spindle lathe

摘要

The device comprises a barrel which is indexed by a multi-spindle lathe at each machining operation. The barrel comprises guiding tubes for the bars to be machined which are in rotation in a fluid delivered between the guiding tube and the bar by pipes connected by tubular shafts to a fluid distributor having inlets connected to different sources of pressure. The feed of the bar is controlled exclusively by a feeding piston under the action of the pressure of the fluid delivered by extension tubes located at the rear of the guiding tubes and maintained in alignment with the latter by sliding rings which ensure the tightness between the tubes. At the time provisioning of a guiding tube with a new bar, the piston is retracted out of the guiding tube into the corresponding extension tube, the sliding ring is shifted on the extension tube and the latter pivots about the corresponding tubular shaft to open the inlet of the barless guiding tube to permit delivery from the side, of a new bar to be machined opposite this inlet. This arrangement leads to a compact construction and facilitates automatization of bar provisioning.