| 摘要 |
665,738. Milling-machine details. VICTORIA MACHINE TOOL CO., Ltd., and FRYE, J. Sept. 27, 1948 [Sept. 26, 1947], No. 26152/47. Class 83 (iii). [Also in Group XXXVII] Power feed-control apparatus for a milling or other machine-tool comprises manual control elements by operation of which speed and direction of the power feed is controllable, automatic control elements mounted in the part of the machine which moves for the feeding and arranged to control the speed and direction of the power feed over a given cycle of movement of the part and selector means having a manual control setting and an automatic control setting in which the manual control elements and the automatic control elements respectively are operable to control the power feed. The work-table of a milling-machine is reversibly traversed at high or low speeds by the alternate operation, of two electric motors which may drive power transmission mechanism as described in Specification 596,147, [Group XXIV]. The motors may be placed under the control of a number of push-buttons 1p-5p which are selectively operable to provide the desired speed and direction of movement of the work-table, or, upon the operation of a selector switch 9, a predetermined cycle of operation may be automatically afforded through the agency of mechanism, similar to that described in Specification 596,207, [Group XXXVII], comprising a number of cams 1-5 which are carried on the work-table and which are adapted successively to engage a vertical plunger 7 and move it to different positions. Cam-operated movement of this plunger to any selected one of a number of positions and back again to normal establishes a selected circuit and breaks any circuit which was made in response to a previous movement. The speed and direction of movement of the work-table is automatically determined by the cam which has last operated the plunger, the desired cycle of operation being afforded by appropriate positioning of the cams. With the selector arm 9 in the " manual control" position a " prepare-start " push-button 10p must normally be depressed before operation by means of the other buttons can be effected. In the case of quick traverse, operation continues only while the appropriate button is depressed, slow feed is stopped by actuation of button 4p, or by limit switches. Re-starting necessitates operation of button 10p. For automatic operation, button 10p is depressed and is then covered by the arm 9. A light 11 indicates operation of push-button 10p. The push-buttons and cams carry insignia indicating the type of operation afforded thereby. Slow movement is shown by arrows, quick traverse by lightning flashes. Fig. 3 is a diagram of the electrical circuits involved (see Group XXXVII).
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