Patent GB-190422043-A (GB)
Filed: 1904-10-13
Granted: 1905-08-24
Abstract: 22,043. Grice, A. G., and Andersen & Co., G. Oct. 13. Dressing and sawing stone, granite, m a r b l e, etc.; copying - ma - chines. - A stone sawing, moulding, and dressing machine has means for sawing in any direction or at any angle, a templet and revolving g cutter disc for moulding to any curve or combination of curves, and means for dressing the stone flat, stepped, or curved. The machine is similar to a plani n g - machine, a table 4 reciprocating and a toolrest 5 rising or falling and moving across the surface of the table as required. A crossguide 6 carrying the tool - rest is moved on two upright guides 7 by vertical screws 8. For dressing stone to templet, provision is made for allowing the crossguide 6 to rise and fall freely a limited amount by causing the nut 9, Fig. 4, of each screw 8 to engage a slot longer than the nut in the crossguide. When the cross-guide is to be controlled by the screw 8, a block is inserted into each slot in order to keep the nuts from moving relatively to the cross-guide, but, when the cross-guide i is to be controlled by emplets 33, the blocks are removed and the weight of the cross-guide and tool-rest carried by rollers 35. The tool-rest 5 can be moved along the cross-guide 6 by a half-nut and screw 12 operated by a band-wheel 13 and spur-wheels 14, 15, or by power, but, when the tool-rest is to be controlled by a templet 28, the half-nut is disengaged from the screw by means of the hand-lever 16. To keep a roller 27 of the tool-rest in contact with the templet 28, a weighted lever 19, or a weight attached to a rope, is provided. The tool-rest carries an adjustable bracket 21, which can be set at any angle and is movable about a short shaft 22 on the end of which is a bevel-wheel driven from the shaft 23 by a sliding bevel-wheel. On the end of the short shaft may be a cross-cut diamond or other saw 24 for cutting, or carborundum or other abrasive discs for moulding, the stone. Near the middle of the short shaft 22 is a bevel-wheel which gears with another on a short shaft 25 at rightangles to the first and capable of being adjusted and fixed at any desired angle. On the extremity of the short shaft 25 may be mounted either the saw 24 or carborundum or other abrasive discs 26. The saw 24 or the discs 26 are rotated by the shaft 23, which is driven either by a belt pulley or by spur gearing. If a belt 29 be used, it is kept under a constant tension, when the tool-rest rises or falls, by being caused to run vertically by means of two guide-pulleys 30, 31 placed equally on both sides of a pulley 32. In some cases, the two sets of templets 28, 33 may be used in combination. For moulding circles, a rotary table may be set on top of the main table (which is then stationary) and rotated by worm or bevel gearing. The table 4 is reciprocated from a countershaft 36 by the open and crossed belts 37 operating alternately and causing a friction pulley 38 to rotate alternately in one direction or the other. This friction pulley operates another 39 which in turn causes a worm 40 to rotate a worm-wheel 41 and with it a ropa pulley 42. This rope pulley actuates a rope 43 which passes over guide-pulleys 44, its ends being attached to the table at 45. The table 4 is moved by the rope which is pulled backwards and forwards. Instead of friction gearing, bevel-wheels and variable-speed cones may be used, and instead of a rope a screw or a worm and worm rack. A handle 46 on a shaft 47 actuates a screw 48 which slides the friction pulley 39 towards or away from the centre of the driving friction pulley 38, thus altering the rate of reciprocation of the table. A hand-wheel 49 on the shaft can be used to engage with the worm shaft and thus move the table by hand. The tools are operated from the countershaft 36 by a belt 50, shaft 51, and belt 29, and the tool-rest 6 is raised or lowered by the handrope 52, which can actuate the wheel 53, cross-shaft 54, and screws 8. A flexible pipe 55 conveys water to the tools. The Provisional Specification states that ordinary planing-tools may sometimes be used instead of saws and carborundum discs.