Patent GB-189925589-A (GB)
Title: Improvements in Turret Lathes.
Inventor: CONRADSON CONRAD MARTINUS
Filed: 1899-12-27
Granted: 1900-12-08
Abstract: 25,589. Lake, H. H., [Conradson, C. M.]. Dec. 27. Lathes. - Relates to the driving-gear, traversing, and feed motions of a turret lathe for boring, turning, screwing, and finishing castings, in which the main turret J, Fig. 1, carries a supplemental cross - feed turret G<1>. The chuck driving- gear, Fig. 5, has a back gear shaft B' below the main spindle B and carrying a pinion c<4>, which can be slid in and out of gear with the chuck wheel C. The cone pulley A' carries pinions a, a', and is loose on the main spindle. The shaft B<1> carries a loose sleeve with loose wheels b<5>, b<6> which can be frictionally clutched to fixed members b<7> by lateral movement of a double cone c<3> operated by a fork b<9> and handle bl', Fig. 1, on a shaft b<17>. The sleeve carries a pinion b<1> gearing with a wheel a<5>, fast on a sleeve a<3> which is loose on the main spindle and carries a pinion a<4> gearing with a wheel b loose on the shaft B'. A bush c<5> feathered in a bearing in the bed is engaged by a lever c<19> on a shaft c<6>, which can be rocked by a handle c<20> to disengage the pinion c<4> from the chuck. A lever c<8> on the shaft c<6> engages in a curved slot in a lever carried by a shaft a<7>, which has a lever 21 for operating a clutch a<6> to connect the sleeve a' or the wheel a<1> and cone to the main spindle. The shaft a<7> is rocked by a handle c<22>, the interlocking levers preventing the clutch a<6> and pinion c<4> from being in engagement simultaneously. A handle c<24> operates a clutch to connect either of the wheels b, b<1> to the shaft B'. This arrangement of gearing admits of two quadruple and four double gear speeds, and a direct cone speed for each speed of the cone A'. The carriage can be rapidly traversed in either direction by a screw D' driven by a fast pulley d<2> and loose pulleys d, d' with open and crossed belts. The belt fork e<2> is moved by a slotted cam e on a shaft E engaging a lever e<1>, the shaft being partially rotated in either direction by a handle E<1> on the saddle to bring the open or crossed belt on to the fast pulley. The slow feed is effected by rotating the nut F, Fig. 6, in which the screw D<7> works, the screw D' being held stationary by a brake block which is applied to the pulley d<2> when the belts are on the loose pulleys. The shaft D<9> is driven from the main spindle by a train of wheels connected to a wheel D<8>, loose on the shaft but normally connected thereto by a clutch d<4> , Fig. 3. The nut F is rotated by a reversing crown train F<3>, F<4>, F<9> driven from the shaft D<9>, and operated by a star handle F<5>. The crown-wheel F<9> is fixed on a shaft having a number of wheels of different sizes gearing with corresponding wheels loose on a shaft H. The shaft H drives a worm shaft I through a friction clutch, operated by a nut h<5>, the shaft I rotating or locking the nut F. By locking any one of the wheels on the shaft H to its shaft, a certain speed of rotation of the nut, and, consequently, a certain feed, is obtained. The locking of the wheels is effected by operating a handle H<3> to slide a notched bar on the shaft H, allowing one of a number of spring pins to engage the desired wheel. The carriage may be traversed by hand by releasing the nut h<5> and rotating a hand-wheel h fixed on the shaft I. The part of the friction clutch rotating on the shaft I drives a vertical shaft h<1>, which has a clutch sleeve h', vertically movable by a handle g<2>, so that the shaft h<1> may be coupled up to the feed-screw g of the supplemental turret G<1> when the main turret J is in the correct position, and thus automatically impart a cross feed to the former. This turret is rotated, locked, and clamped by hand in the usual manner. The main turret is locked by a pin j engaging one of a number of recesses in the lower face of the turret. The pin is hollow and is withdrawn by a spring L<5>, being pushed up by a central rod L<3> acting on a compression spring L<7> to allow for inequalities in the recesses. The rod and pin are withdrawn by the spring L<5> when a cam on a wheel k<5> is rotated from below a roller on an arm k, pivoted on a spindle k<9> and connected to the rod. The cam-wheel is fixed to a spindle k<4> on which is loosely mounted a spiral gear k<2>, Fig. 11, driven from a spiral gear k<0> on the shaft D<9>, and carrying a ratchet-wheel k<10>. When a trip lever N is thrown forward, a lever is removed from a spring pawl on the cam-wheel, allowing the pawl to engage the ratchet-wheel, the cam-wheel and spindle k<4> being rotated one revolution when the pawl is again disengaged by the lever. This revolution of the cam-wheel effects the withdrawal and return of the locking-pin and also imparts movement to parts for unclamping, rotating and clamping the turret between the unlocking and locking. The spindle k' is equally geared to the spindle k<9> carrying a cam-wheel L which has a roller L<1> engaging a slot in a ratchet lever M<2>. The ratchet lever engages a ratchet disc M<3> on a shaft M' geared to the turret by wheels M<4>, M<5>. The turret is clamped by a divided ring L<8>, L<9> embracing flanges l, l<1> on the turret and carriage. The parts L<8>, L<9> are wedged outwards to clamp the turret by a right and left handed screw L" operated by lever l<5> engaging a cam L<2> on the wheel L. The single revolution of the spindle k<9> and wheel L moves the cam L<2> from under the lever L<17>, unclamping the turret, and oscillates the lever M<2> to rotate the turret one space, when it is again clamped by the re-engagement of the cam L<2> and lever L<17>. The trip lever may be held over if the turret is required to rotate more than one space. For bringing the rapid traversing motion and slow feeds into action automatically at the desired times, a number of bars 0', corresponding to the number of holders J<2>, are mounted in a rod o, capable of a slight longitudinal movement in the bed. Each bar is provided with an adjustable stop, the bars being adjustable longitudinally in the rod. A sleeve o<7>, mounted in the saddle and surrounding the bars, is rotated simultaneously with the turret to bring an internal lug o<9> over the bar corresponding to the tool in use. When the forward limit of the feed is reached, tha lug o<9> engages its stop and moves the rod forward against a lever, which through a connecting-rod P<1>, Fig. 3, disengages a clutch and stops the feed. When the operator wishes to return the turret, the lever E<1> is operated to release the brake from the pulley d<2> and to bring the crossed belt from the loose pulley d<1> to the fast pulley d<2>, thus rotating the screw D<7>. When the carriage has been sufficiently traversed, it strikes a tappet e' on the rod E, and shifts the crossed belt back. Simultaneously the clutch of the rod P' is disengaged from the wheel D<8> and engaged with a wheel d' driven from the pulley d, thus giving a fast speed for rotating the turret. The screw fed by the screw D' may be replaced by rack and pinion &c. The belt pulleys may be mounted on the screw D', which may also be driven through a train of wheels and a clutch from the main spindle. The shaft D<9> is then dispensed with, the screw D' being driven by the belts and wheels for fast and slow motions respectively.