Patent GB-329388-A (GB)
Title: Improvements in and relating to grinding machines, planing machines, milling machines and similar machine tools
IPC: B24B47/06
Filed: 1929-02-19
Abstract: 329,388. Lumsden Machine Co., Ltd., Stanier, J. H., and Blake, E. G. Feb. 19, 1929. Milling-machines,. planing.-In a planing or milling-machine, or other machine tool having a reciprocating work-table and a cross-traversing tool head, means are provided for selectively controlling the automatic movements of the table and of the head so that the table alone can be reciprocated, the head alone can be traversed, or a compound movement may be employed made up of successive movements of the head and of the table. The machine, shown as a grinding- machine, comprises a hydraulically-operated reciprocating table A and a traversing head K carrying a grinding-wheel K<6>. The table is moved by a piston P<5> moving in a cylinder P, and the head K is traversed by rack and pinion gearing Q<6>, Q<5> operated, through similar gearing Q<2>, Q<3>, by a piston Q<9> in a cylinder Q. Fluid is supplied to the cylinders from a pump N through a valve M adapted to divert the fluid from a valve S, for reversing the movement of the table, to a valve R for reversing the direction of traverse of the head K. The valve M is moved, against the action of a spring M<1>, by a solenoid M<2>, the head K is locked during reciprocation of the table A by a lever K<2> actuated by a solenoid K<1>, and feed is applied to the grinding-wheel, at the ends of the reciprocations of the table, or of the traverses of the head, by a solenoid F<1>, which operates, through a lever F<2>, ratchet and rack pinion gearing F3 - -F<6>. The circuits of the solenoids are respectively controlled by contactor switches U, W, V connected as shown, and having terminals B, C, D arranged so that, on connection of the terminals B, D the switch closes, and upon opening the connection between the terminals C, D the switch opens, connection of the terminals C, D being necessary before connection of the terminals B, D closes the switch; main leads 23, 24 supply current to the switches &c. The circuits of the solenoids include push-button switches 1 - - 3 operated by a cam S<2> on the lever S<3> which when moved by stops A<1>, A<2> on the table A operates the valve S, push-button switches Z, Y and X, L actuated by a tappet 14 moved by cams on a disc 6, which is rotated in timed relation to the traversing movements of the head by gearing from a disc 9 carrying adjustable stops R<3>, R<4> for moving a lever R<2> for reversing the valve R, and a push-button 4 also moved by the lever R<2>; a push-button 5 also is provided, moved by the lever F<2>. The operation of the machine is under the control of a selector 16 comprising a disc carrying cams 17 - - 22 adapted to operate switches E, H, G, J, F, respectively, in the circuits of the solenoids, and moved by a handle 16<a>. With the handle in position 25, the machine is set for traverse of the head K only, in the position 26 it is set for reciprocation of the table A only, and in position 27 it is set for compound motion made up of successive movements of the table A and of the head K; by suitably arranging the cams on the disc 6 the four sides of a rectangular piece of work may be ground in succession. The machine may have movement or movements additional to those described, and further, may be operated electrically or mechanically instead of hydraulically, a two-way switch or a double clutch instead of the valve M then being operated by the solenoid M<2>