GB497873A - Improvements in multi-spindle automatic turret lathes and like machines with an indexible work spindle turret - Google Patents

Abstract

497,873. Chucks; turrets. FORKARDT, R. Nov. 9, 1937, No. 30790. Convention date, Nov. 9, 1936. [Class 83 (iii)] A pressure distributer for hydraulic or pneumatic clamping devices of multi-spindle automatic turret lathes &c., with a work spindle turret wherein the pressure medium is supplied by a stationary supply casing to a shaft fixed to the turret, and independently indexed control means are provided for opening and closing the clamping devices in any operative positions of the spindles, is characterized in that the control means comprises a separate distribution casing 7 rotatably mounted between the supply casing 8 and the shaft 6, which is provided with valvecontrolled passages so that by indexing the casing and setting the valves, pressure medium may be supplied to selected clamping elements at a high or low pressure. Chucks 2 operated through piston and cylinder devices and carried by the turret disc 1, are fed with pressure fluid through a stuffing box 4 from pipes a and bled from a reversing valve 5. Three pipes H, R, N are provided for high pressure fluid, return and low-pressure fluid, respectively, and connect with annular passages H<1>, R<1>, N<1> provided in' the non-rotating supply casing 8. These passages are connected through passages in the distribution casing 7 to passages h, g, in the shaft 6 which is integral with the turret disc. The connecting passages in the distribution casing are provided in a selected position with a regulating valve i and a non-return valve k; when the former is closed low-pressure fluid passes from the channel N<1> by way of the non- return valve i to the passage h and thence to the chuck, but when open high-pressure fluid is admitted from the passage H<1> and passes to the back of non-return valve i and thence to the passage h and chuck.