Patent GB-190702043-A (GB)
Title: Improvements in Marble Working Machines.
Inventor: PEIRCE JOHN ROYDEN
Filed: 1907-01-26
Granted: 1908-01-25
Abstract: 2043. Peirce, J. R. Jan. 26. Sawing marble &c.-A gang machine for cutting baseboards, tiles, &c. from marble &c. has a gang of cutters, preferably consisting of thin wheels of carborundum or similar agglomerated crystalline or granular material, moving over a thin slab of marble or under which the thin slab is moved to obtain a series of parallel cuts. Each wheel is mounted on a common driving-shaft B in a separate carriage E. Each wheel is received in a slotted flange F projecting from the front of its carriage, and is mounted, with a plate G at each side, on a hub H which is provided with ball bearings K and splined on the shaft B. Each hub is provided with a cover-plate J bolted to the carriage, and in order to insert or withdraw any wheel, the shaft B is drawn out endways and the corresponding flange disconnected. To withdraw the shaft, one of its end nuts is removed, and to avoid interfering with the pulleys C, they are carried on a hub L journalled in the frame, Fig. 3<a>. Each carriage is fed along a fixed screw S by a threaded sleeve Q rotated by the gear U and pinion V from a shaft T when the clutch W is put into gear. In order to alter the distance between each carriage and yet to maintain an equal distance between them, the ratio between the gear and pinion in the different carriages varies, and to arrange the wheels at irregular spaces, the clutches of certain of the carriages may be disengaged ; the shafts B, T, S extend considerable distances at both sides of the bed so that any number of wheels may be withdrawn entirely from the marble. The carriages have overhanging flanges 0, P to engage guides M, N projecting from the beam Y, which has also rearwardlyextending ribs and an arched rib a ; the beam is carried upon slides b and is adjusted vertically by screws operated by worm gear from the shaft e. The work-table, which is reciprocated by a screw s, may be fixed at certain angular positions, being connected at its centre to a circular bearing-ring m, which lies in a groove in an intermediate frame n sliding on the guides l. To fix the table, the frame n carries a pin q, which is raised into one of a series of sockets on the underside of the table by a handle r. The carborundum cutting-wheels, which may be continuously rotated in one direction, may cut in either direction of motion of the table, and roses or nozzles 10, supported on the carriages, supply water to the cutting point. The cuttiogwheels may rotate in an opposive direction to effect the second series of cuts. The cut may not extend right through the marble but may leave a thin wall, so that the transverse cut may be effected without re-clamping. The rear lines of each edge are left in a more or less bevelled condition. If it is required to have a perfectly smooth edge, the slab may be bedded on a thin layer of plaster of paris &c., and the cut extend right through the material. To facilitate the movement of the work, it is fixed by a clamp which does not project substantially above the top of the work. In one form, Fig. 6, the clamp consists of a forked clip y, pressed down by a pair of eccentrics 4 pivoted to a pin 2, the head 3 of which is engaged in one of the grooves u in the table. In another form, Fig. 9, the pin is hollow to receive the clip 7, and is tightened by a wedge 9.