A new or improved multiple-purpose machine for performing sawing, filing, grinding, slotting and other operations

摘要

406,681. Combination sawing, grinding, and like machines. EVANS, A. H., St. Leonards, Wilmslow Road, Cheadle, and FLETCHER, C. N., 51, Swann Lane, Cheadle Hulme, both in Cheshire. July 22, 1932, No. 20666. [Classes 60 and 145 (ii).] Disc, wheel, and roller apparatus; tables slides and carriages; work holders ; reciprocating-saw machines.-A multi-purpose machine tool for sawing, filing, drilling, grinding, honing, slotting or similar operations comprises a reciprocating tool frame 30 with means for holding a saw 30b, file, or other tool, a vertical spindle 24 which may be rotatably secured to the frame 30, and an apertured worktable which may be reciprocated horizontally to and from the saw or other tool in timed relation to the reciprocation thereof. In one form, Fig. 1, a box frame 1 encloses the driving gearing which consists of a power shaft 3 which drives through variable speed gearing 5 a shaft 8 connected through a clutch and bevel gearing and hand-operated clutch to a vertical spindle 10 which is further connected, at the upper end of the column 2, to a variable speed gear 19 which through stepped pulleys 20, 25, drives the vertical spindle 24. The shaft 7 also carries a belt pulley 12 arranged to drive a countershaft 13. The spindle 24 carries a tool holder 28 and may be fed vertically by a quill 24a operated from a hand wheel 29. By removing the belt 26 the spindle may have a vertical movement only. The countershaft 13 is connected by crank mechanism to the frame 30 which is guided by guides 31 and a vertical surface 31b. The upper part of the frame terminates in a boss 30a through which the spindle 24 and its quill may pass. The quill may be secured to the boss 30a so that the spindle 24, while either rotating or stationary, may partake of the vertical movement of the frame 30. A saw blade 30b or file may be secured between the boss 30a and a lower holder 30c on the frame. The saw may be steadied by an arm 34b. Another holder 28a may grip the lower end of a tool, such as a hone, mounted in the chuck 28. The work table 34 is mounted on a spindle 33 adjustable by rack and pinion gearing 36. The table is in two parts a b the upper part being adjustable upon and around the lower and having a vice c for gripping the work. The parts a b may be clamped together by screws d. For sawing or like operations the work is frictionally held on the table by clamps e. The table may also be angularly adjusted about perpendicular horizontal axes by means of part-spherical supporting members or, as shown in Fig. 1, by two pairs of arcuate supporting members 38, 39, and 40, 41. The weight of the frame may be balanced by a spring 42. During drilling or like operations the frame 30 is kept stationary by moving the crank mechanism to a dead centre position. The clutch 7a may be controlled by a foot lever. A pump 43 may be arranged to discharge air paraffin or other coolant to the tool while the reciprocating frame is in use. In a modification, Fig. 4, the shaft 7 is driven from an electric motor 46 and a second motor 49 is provided to drive the spindle 24. The work table 34 is fitted with a feed mechanism for feeding work to a saw and withdrawing it on the return strokes. A screw 53 passing through a boss 54 secured to the part 38 encloses a screw 53a terminating in a member 56 slidable over the screw 53 and urged towards the work by a spring 57, whose tension is adjusted by nuts 58. A horizontal shaft driven from the countershaft 13 and sliding in the member 54 carries a face cam co-acting with a similar cam secured to the member 54 so that the table 34 is continuously reciprocated synchronously with the saw or other tool. The feed member 56 engages behind the work and is fed manually by the handwheel 59. Before the end of the withdrawal movement of the work table, the work engages the stop 56 and the table slides beneath it, thus feeding the work towards the tool.