| 摘要 |
1,119,898. Copy-milling. DATA RESOLVED TOOLS PTY. Ltd. 28 Oct., 1966 [3 Nov., 1965], No. 48342/66. Headings B3B and B3K. [Also in Division G3] A model to die reversal arrangement comprises a cutting head and work-table, relatively movable in X, Y and Z directions, a tracer and a model table, relatively movable in X, Y and Z directions, electrical servo-loops coupling the respective tool and tracer movements and a direction reversing device in at least one of the servo loops. As shown, a model 61 is mounted on a table 62, tiltable about the X axis on a table tiltable about the Y axis, the tilts being controlled by threaded members 68, 69. An hydraulic tracer head 78 is moved about the X, Y axes by electric motors 80, 81 having pinions engaging precision racks. The motors are connected in servo-loops comprising synchros 90, 91 responsive to X, Y movements of a milling machine 50, and synchros 100, 101 responsive to movement of the tracer head, the motors being energized by error signals through amplifiers 110, 111. Zero off-sets are set in by differential synchros 120, 121. The direction of movement of the tracer head, in response to a movement of the milling cutter, is controlled by changeover switches 130, 131. Vertical movement of a ball-ended feeler member 79 of the tracer head 76 actuates an hydraulic spool valve 78 controlling an hydraulic cylinder for the Z axis movement of the milling machine. Displacement of the cylinder 56 is sensed, through a rack and pinion, by a synchro 92 connected in a servo-loop with a synchro 75, the error between the positions of the synchros energizing through an amplifier 112, a motor 82 positioning the feeler 79 to the null position of the spool valve 78. The relative direction of a milling cutter and the feeler is reversed through a change-over switch 132. |
