| 摘要 |
1,124,969. Profile recorders. BENDIX CORP. Dec. 17, 1965 [Dec. 21, 1964] No.53661/65. Heading G1N. In a rotary profile recorder in which a tracer is rotated about a stationary cylindrical specimen, the output from the tracer is fed, during one or more initial centering operations, to servomotors which automatically adjust the position of the specimen table and the radial distance of the tracer from its axis of rotation. The specimen table (18) is mounted for X and Y travel along horizontal guides, Fig. 1 (not shown), and the tracer (40) is mounted for radial travel along a horizontal guide (41) fixed on a rotatable vertical shaft (32). As the tracer traverses the circumference of the specimen a spring mounted probe (42), Fig. 2 (not shown), moves in accordance with the profile thereby modulating the output of an oscillator (53). As described with reference to Fig. 4 (not shown), a resolver (108) having a rotor driven synchronously with shaft (32) forms the X and Y components of the tracer output which are integrated over one complete revolution of the tracer and fed to X and Y servomotors (52, 50) respectively. Also, an unresolved output from the tracer is integrated and fed to the tracer drive servomotor (54) to position the tracer so that its null position corresponds to the mean radius of the specimen. A variable gain amplifier (96) enables successively more sensitive centering operations to be performed. In another embodiment, Fig. 5 (not shown), in which the centering starts as soon as the tracer is started, the servomotors perform the integrations themselves, centering being completed during a set number (preferably one) of tracer revolutions after which a relay (186) automatically stops the tracer and energizes a light (192). D.C. tachometers provide linearising feedback. Amplifiers (206, 224, 238) discriminate against harmonics of low amplitude signals but have a high bandpass for large signals, Fig. 6 (not shown). |
