Improvements in or relating to boring, facing and milling machines and the like machine tools

摘要

661,880. Boring, facing, and milling machines. BERTHIEZ, C. W. June 30, 1948, No. 17616/48. Class 83 (iii). A boring, facing, and milling machine comprises a headstock with a rotatable spindle and adapted to be moved up and down on a vertical column, characterized in that the headstock is supported on a slide and is able to move on guideways parallel to the direction of the spindle, said slide being adapted to move along vertical guideways of the column and the spindle being splined in a rotatable sleeve which is adapted to receive a cutting tool such as, for example, a milling cutter. The vertically adjustable carriage 4 of the machine is provided with horizontal guideways 7, Fig. 3, along which the headstock 6 is adapted to slide. The spindle 12 is also axially adjustable within a sleeve 8 rotatably carried in bearings 9, 10, in the headstock. The sleeve is driven and rotates the spindle through a key 13 and groove 14. Axial feed of the spindle 12 is obtained through a block 15 to which it is rotatably secured and which carries a nut 17 engaging a screwed shaft 18. The latter is driven when a dog clutch 22, 23 is engaged by spiral gears 28, 29 from a cross-shaft 30. This shaft may be rotated by a hand wheel 31 or, when the hand knobs are pressed inwardly to engage a clutch (not shown), by an independent motor 39 driving through changespeed mechanism 40 a shaft 38 and worm 36, a worm wheel 37 on the shaft 30 engages the worm. When a toothed wheel 24 is moved to the left, Fig. 4, to disengage the " spindle feed " clutch 22, 23, it may be brought into engagement with a toothed wheel 45, loosely mounted on the spindle sleeve 8, and engaging a further toothed wheel 44 secured to a nut 42. This nut engages a screw 41 secured to the carriage 4 and rotation of the nut serves to feed the headstock. The latter may thus be fed either by hand or automatically by the common driving means used for the " spindle feed," when the toothed wheel 24 is in the left-hand position engaging the wheel 45. Alternative work-table and bed arrangements are described and the headstock may have a front face arranged to take attachments as described in Specification 661,879, which is referred to.