Construction of pendulum arm type high sensitivity self-aligning weighting arm

In a pendulum arm type, self-aligning weighting arm assembly for use with textile machinery and having casing means, said casing means including a pivot member, weighting arm means pivotally mounted at one end to the said pivot means of said casing means for movement in a plurality of directions, rotatably driven roller means rotatably mounted on the opposite end of said weighting arm means, driving body means operatively positioned with said driven roller means for rotating same and pressing means operatively engaged with said weighting arm means intermediate the ends thereof urging said driven roller means into engagement with said driving means, the improvement of the pressing means which comprises cap means U-shaped in cross-section positioned in the lower end of said casing means for vertical movement therein, a rolling contact bearing element positioned within said casing means and between the bottom of said cap means and the top surface of the weighting arm means intermediate its ends thereof and in bearing engagement therewith, said rolling contact element being smaller than the width of the open end of the inverted U-shaped cap means for free rolling movement therein, and spring means positioned in said casing means and above said cap means positively urging said cap means vertically downwardly against said rolling contact bearing element.