| 摘要 |
1,086,188. Drilling and milling machines. CROSS CO. Feb. 2, 1966 [March 9, 1965], No. 4636/66. Headings B3B, B3C and B3K. [Also in Division F2] In a machine tool for drilling, milling etc. which includes a reciprocable tool carriage 17 having a rotary tool spindle 19 the carriage is slidably mounted by two tubular members 27 on guide rods 29 and two drive motors 21, 23 are provided to give respectively slow feed motion and rapid traverse to the carriage 17, the tool spindle 19 also being driven from the first drive motor 21. Limit switches 177, 179, 181 determine the extent of rapid traversal and tool feed motion, initiate return of the carriage and finally stop it in its retracted position. A stationary housing 22 encloses transmission gearing and is provided with an end cover on which the second motor 23 is mounted. The transmission gearing provides a high reduction for drive from the first motor 21 and low reduction for drive from the second motor 23 which is reversible; it includes two rotary annular gear cages 97, 99 and a ring gear 107 in mesh therewith internally and mounted on an eccentric 109. For rapid traverse in either direction drive is taken from the reversible motor 23 through gear 131 to a gear 123 integral with the cage 97 and therefrom through ring gear 107 to the cage 99 which is integral with an output shaft (57, Fig. 3, not shown) in splined connection with a screw member (39) which moves the carriage 17. For slow feed of the tool and carriage belt drive from motor 21 to a shaft (77, Fig. 3, not shown) and through gears 75, 73 causes the eccentric 109 to rotate and thus the ring gear 107 moves in an orbital path in mesh with cage 97 which is held stationary by means of a brake mechanism 137 attached to motor 23. Gear 107 causes the cage 99, which has slightly fewer teeth than cage 97 to rotate slowly and thus also shaft (39) rotates slowly to effect slow feed of the carriage 17. Tool spindle 19 is driven by the shaft (77, Fig. 3, not shown) which has a splined connection therewith. Housing 22 includes provision for mounting a further shaft above shaft (77) if further reduction gearing is required in the drive from motor 21. Reference is made to two proprietary gear units which may be substituted for the unit 25 described. |
