Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 821
e-up to draw up the loop of upper thread between the casting-ofl of the loop from the hook and the descent of the needle to form the next stitch. Ing.2 shows the bobbin of under thread in its case, and the tension spring on the latter, iheamount of tension may be regulated when necessary by turning… … 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…
Mechanical engineering
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