a part of the oscillating tappet-motion of a loom by which the pattern chain is rotated so as to place the weft in the fabric in proper progression.
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1894 T. W. FoxMechanism Weaving 54 The tappet is made to oscillate in the following manner:—Pinion 1 on the crank shaft drives carrier wheel 2 round stud m, and it gears with slide wheel 3.