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This admirable motion will no doubt attract much attention from mechanists and engineers.
A model 27/127 coincidentally weighs 27 pounds (12 kg), plus the weight of its motor, treadle, or hand crank, its light, and its case or cabinet.
Variation of tension is thus obviated in a very simple manner.
The chief point of interest in the machine is undoubtedly the means employed in transferring the motion from the main shaft to the underneath parts, an arrangement as ingenious and effective as any device ever introduced into stitching mechanism. Robert Whitehall [sic], and consists of a vertical rocking shaft situated in the arm of the machine[.] Motion is imparted to it by means of an elbow formed upon the main shaft acting upon two arms, called wipers, projecting from the rocking shaft, the angle formed by the arms exactly coinciding with that of the elbow in its revolution.
It was popular in its time, and some of them remain. He then designed the sewing machine which would shortly become Singer's answer to the White machine.
The main competitors were Sears Roebuck & Co and Montgomery Wards & Co, who sold copied Singer models made by a variety of manufacturers: A treadle obtains power from the user's legs.
Of Vibrating Shuttles These are shuttles of the long description, moving in a segment of a circle. The most novel machine of this kind is the vibrating shuttle machine just produced by the Singer Manufacturing Company.
In this case the shuttle itself consists of a steel tube, into the open end of which the wound reel is dropped, and is free to revolve quite loosely.
A round leather "treadle belt" passes up from the treadle, up through the cabinet, over the handwheel by following the belt groove, back down through the cabinet again, and then back to the treadle.
The belt is joined end-to-end with a clip to make a loop, and can be shortened and reclipped (using special "treadle belt pliers") as needed to keep proper tension.