Model of reciprocating sawmill

model, scale 1:10, of reciprocating sawmill, Arbey type, for unbarked timber, by P. Regnard, Paris

The model shows a power frame-saw, made by Messrs F. Arbey & Son, of Paris, in which only one saw blade is used. This blade is carried, in tension, between the overhanging arms of a frame, reciprocated in vertical guides by a connecting-rod from a crank pin on shafting beneath the floor level. The log to be squared or sawn is gripped at one side by two pairs of claws, actuated by screws in two verticaI slides or standards. The standards are adjustable across the bed of a carriage which is supported on special rails and moved by a pinion engaging with a long rack. The pinion is rotated continuously through a train of reduction gearing by belt drive for the first motion shaft. A friction clutch controls a quicker and reversed travelling motion for use in running back the carriage. The upper edge of the saw is somewhat in advance of the lower one, so that the teeth shall not drag through the timber in the upper or non-cutting stroke. In oaken timber for depths of from 12 to 28 inches the rate of feed for a saw of this period and type was from 8 to 4 inches/min, or the area of the surface cut about 100 sq inches/min.