| 摘要 |
722,881. Copying lathes. BECKER, H. Feb. 6, 1953 [Feb. 7, 1952], No. 3453/53. Class 83 (3). A copying lathe &c. comprises flat cams and feeling pins for transverse and axial movements of the tool and in which the cams for producing non-circular or eccentric cross-sections of the .work are rotated in synchronism with the work, while those for producing surfaces of revolution on the work are fixed, the feeling movements of the pins being combined to produce a'resultant movement of the tool. A longitudinal slide 32, Fig. 7, is mounted on bed guides 31 and may be moved by screw 37. A cross slide 33 is carried by the first slide and is fed by a screw 38 driven in either direction by a motor 39, Fig. 8, through an electromagnetic clutch 40, 41. The latter is controlled by a switch 42 operated by an arm 43 of a gear sector engaging a rack 44. The rack 44 in Fig. 8 is equivalent to the rack 27 of Fig. 1, and derives its movement from a stationary rack 17 in a casing 1 and a series of further slidable racks and pinions mounted on tracer pins such as 18, 20, 22, &c. The tracers are moved, either by flat cams 12, 14, 16, driven in timed relation with the work, or, by relative sliding movement over fixed templates such as 13, 15. The final movement of the last rack, which operates the control switch for the feed clutch, is an algebraic summation of the tracer movements. The cams are used to control tool movement in elliptical, eccentric, or other out-of-centre movements while the templates control the tool movements to obtain the plan shape of the work which in the example shown, Fig. 2, is a crankshaft. The tool slide 34 may be controlled similarly by feeler pins 54 ... 56, Fig. 8, cooperating with templates - VII, VIII, and rotating cam X. |
