Patent GB-524441-A (GB)
Title: Improvements in lathes and like machine tools
IPC: B23Q5/14
Filed: 1938-12-22
Abstract: 524,441. Lathes. WARNER & SWASEY CO. Dec. 22, 1938, No. 37268. Convention date, Dec. 28, 1937. [Class 83 (iii)] [Also in Group XXTV] A lathe or like machine tool has a movable part driven from a power source through a clutch and change speed gearing, both operated from a control lever, arranged so that when the clutch is disconnected the gears are at the same time shifted for the next operation of the movable part. The bed carries a turret slide 34 and a slide 36 provided with a cross slide 38. The turret slide, slide rest and cross slide are all fed from a longitudinal feed shaft 39. This shaft carries a splined gear sleeve 40, 40a secured in the slide rest apron 37, the gears 40, 40a being engageable directly or through and idler for reversal to a gear 41 splined on a shaft 42 and shiftable by a fork and operating lever 45b. A sliding gear pair 46a, 46b slidable by a rod 49 are selectively engageable with gears 47, 47a on a shaft 48 to impart a twospeed drive thereto. Shaft 48 carries a triple sliding gear 50a-50c slidable by a rod 53 and serving to impart a further three speed drive, giving six gears in all, to a shaft 52 connected by worm gearing 54 to a friction clutch member 55 through which drive may be imparted to a shaft 56, the clutch being operated from a lever 57. From a shaft 56 the drive is transmitted through gears 58 to a shaft 60 carrying a pinion engaging a rack 60b on the frame to feed the slide rest. The clutch member 55 carries a gear 61 driving a gear 61a connected through a cone clutch and gear 66a to a screw shaft 66 operating the cross slide, the cross feed clutch being operated by a lever 64. When the control lever 57 is raised the clutch 55 is engaged. A stop roll 68 has stops 68a coacting with a stop 69 to move the roll 68 endwise at the end of the movement. This causes a cam surface 68b, Fig. 6, to disengage a pin 57a from the lever 57 whereupon the lever drops and the clutch is disengaged to stop the traverse. For stopping the power feed of the cross slide, the latter carries adjustable dogs 71 acting through a pin 72 on a plunger 73 which pushes a pin 64a out of a bore in the lever 64 thus allowing the lever to drop and disengage the cross feed. The gear control rods 49, 53 project into a housing 74, Fig. 7, carrying a shaft 75 fitted with a pair of spools having twelve sets of projections of different lengths corresponding to the six speeds of each of the two power feeds. The spools coact with pins on the shifting rods and are indexed by a dial 78 the dial having indications of the speeds obtained from the various settings, and the preselected change being effected when the spools are moved together. Equal and opposite movements are imparted to the spools by an equalizer bar on a shaft 80 connected to a three-armed lever 85 having pins on its short arms 85b, 85c coacting with extensions on the feed clutch operating-levers 57, 64. When the lever 85 is moved to the dotted line position in Fig. 4, the spools are in the inward position and in the position shown in full lines the spools are separated for indexing. When a traversing feed movement terminates the lever 57 falls to the full lever position and a spring 87 moves the lever 85 to the dotted line position to bring the spools together, to obtain a preselected feed. If this feed is to be imparted to the slide rest the operator manually engages the lever 57 to start the feed. If the feed is to be imparted to the cross slide the operator raises the lever 64, a movement which also moves lever 85 to separate the spools so that the next feed can be preselected. The turret slide may also have a preselected feed controlled by a single lever 88 shown applied to the control lever 91, Fig. 10, of a slide rest 89 having no automatic cross feed. The lever 91 may be tripped by stop mechanism similar to that described above. In its full line position, Fig. 10, the linkage connected to lever 91 causes separation of the spools for preselection of a gear. The Specification as open to inspection under Sect. 91 comprises also a modification of the preselecting mechanism, Fig. 13 (Cancelled), wherein the gear shifting rods 94, 95 carry pins 94a, 95a. A pair of rods 97, 98 carry a slidable frame 99 operated from a knob 99b, Fig. 15 (Cancelled). The frame is fitted with bearing pins 100, 101 which support six pairs of pivoted camming members 102 carrying co-operating pairs of projections of different lengths. The cam projections selectively coact with the pins 95a, 94a according to the position of the frame 99 so that by adjusting the knob 99b any of the six gears may be preselected. A slide 104 arranged above the members 102 is recessed to form cam members 104b, 104c. The slide 104 is raised or lowered by a lever arm 106. When the lever is raised, the members 104b, 104c, and the slot 103a maintain the members 102 in the position shown in Fig. 13 (Cancelled), wherein a gear is preselected. When the lever is lowered one pair of the members 102 are released so that they turn on their pivots and effect the preselected change, the other members remaining open owing to their engagement with the slot 103a. In another the modification of the preselecting mechanism side walls of the housing 109, Fig. 21 (Cancelled), are provided with ribs 110, 110a, which with strips 111 form guides for a frame 112 mounted on a spindle provided with a setting knob 112b. The frame carries six parallel cross rods 113 each fitted with a pair of cam blocks 114 carrying projections of varying lengths, which coact with pins 94a, 95a on the gearcontrol rods. A bar 115 in the housing supports slidable shifters 116 having downward projecting tongues 116a co-operating with slots in the cam blocks.. In their outer positions the slots in five pairs of these blocks engage projections 110a on, the guide ribs while the sixth pair of blocks are engaged by the tongues 116a projecting through slots in the guide ribs. The blocks 116 are moved simultaneously inward to move a particular pair of cam blocks by ball crank levers 117 actuated by a nut 118 on a quick pitch screw 119, which is rotated by an arm 120 which may be connected to the link 84 of the mechanism described above. This subject-matter does not appear in the Specification as accepted.