. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . I SEWING MACHINES. 791 rotating hook. These parts are brought into proper position by closing the drop, a, whichis firmly held upright by the catch-spring, b. Fig. 4 shows the face-plate of the machine andthe passage of the upper thread through the thread check, tension pullev, thread controller,and take-up, which last is provided with a roller to reduce friction on the thread, and tofacilitate sewing with threads o
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . I SEWING MACHINES. 791 rotating hook. These parts are brought into proper position by closing the drop, a, whichis firmly held upright by the catch-spring, b. Fig. 4 shows the face-plate of the machine andthe passage of the upper thread through the thread check, tension pullev, thread controller,and take-up, which last is provided with a roller to reduce friction on the thread, and tofacilitate sewing with threads of poor quality. In the •variety stitch machine the loop-taker (or rotary hook) is set with its axis ofrotation at right angles to that of the main lower shaft of the machine ; the needle-bar iscari-ied in a swinging gate connected with a segment lever, which is actuated by a cam on.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
