| 摘要 |
<p>1,262,432. Collet actuating devices. HARDINGE BROS. Inc. 4 March, 1970 [13 Oct., 1969], No. 10451/70. Heading B3T. A collet actuating device comprises an annular casing 44 concentric with the machine spindle 20 having a collet X at one end, a collet draw tube 22 connected to an actuating member 26 within the casing and Belleville spring washers 24, 25 located concentric with the spindle between a shoulder on the actuating member 26 and a sleeve member 28 attached to the casing, which provide an axial force for displacing the draw tube axially relative to the spindle 20 to effect closing of the collet. The opening of the collet is effected by a fluid actuated piston 42 operable within an annular chamber 58, in the casing the piston acting through a bearing 36 to compress the Belleville springs and effect axial displacement of the draw tube in the opposite direction and hence opening of the collet. The spindle, draw tube, actuating member and sleeve member all rotate in unison with the spindle, the casing and piston being mounted on bearings 36, 70 are non-rotatable and are retained in position by slot and key means 46, 50 the key being secured to a part of the machine frame. The displacement of the piston is controlled so that its length of stroke is less than the total permissible deflection of the Belleville springs. The axial position of the drawtube and collet is adjustable relative to the spindle to permit operation with workpiece diameters of varying size.</p> |
