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Quarrying Techniques - Machinery for Dressing Slate:  J.W. Greaves

the workers the quarry and blasting
working the slate mechanisation

Carnarvon. Patent dated May 18, 1861.

THE machinery or apparatus for dressing slates, introduced by the patentee, affords accommodation for two workmen at the same machine, thus producing double the amount of work hitherto accomplished in machines of this description. According to this invention, the cutter or cutters is or are mounted at a slight angle or inclination to the axial centre line of the main shaft of the machine upon a pair of holding discs or frames. The cutting edges of the cutter or cutters are in opposite directions, so that by imparting a circular reciprocating motion to the discs, they will alternately act upon and dress the edges of the slates, which are presented to them, upon stationary cutters or knives at each side of the machine.

Drawing of the Greaves dressing machine

Fig. 1 of the accompanying engravings is a side or end elevation of this improved double action slate dressing machine; and fig. 2 is a corresponding plan of the same. A is the main framing of the machine, and B are two knives or cutters mounted on the discs, c, fast on the shaft, D, the knives being at an angle with the shaft in place of being parallel therewith. A reciprocating motion is imparted to the knives, B, by a crank or cranks at E, on the crank shaft, F, to which a rotatory motion is imparted by a strap and driving pulley, Q, or by any other suitable contrivance. H is a connecting rod, serving to connect the rotating crank, E, with the longer and reciprocating crank, T, fast on the cutter shaft, D. The rotation of the crank, E, imparts the desired i oscillating or circular reciprocatory motion to the cutters, which have their cutting edges in opposite directions, and act alternately upon slates, as at J, laid on the two stationary cutters, KL. L is a fly wheel fast on the driving shaft, F, and M are the gauges for determining the proper dimensions of the slates. It is obvious that in lieu of two reciprocating cutters one such cutter only might be employed, each edge acting alternately as a cutting edge.

From: The Practical Mechanic's Journal, 01/04/1862

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