Cyclopedia of textile work : a general reference library on cotton, woolen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects (1907)
Chicago : American Technical Society · leaf 374
for seam- ing, the cutting edge of the lower blade should be adjusted even with the top of the throat-plate, or needle-hole piece. For concealed stitch hemming this blade must be a trifle higher, and for both purposes the cutting edge of the upper blade must pass by that of the lower one a… … kept sharp, for if they are allowed to become dull no end of annoyance and bad work will ensue. Sharpening the Cutters. That the blades may be ground accu- rately there is furnished with each plant of ‘“Overlock” machines a trimmer blade grinder. On the slide of this little machine a set of grooves…
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