(337) Fixed on the winding faller and counter faller shafts =B B^{ 1}= (Fig. 168) are two arms =U U^{ 1}=, to which the ends of a light chain =Y^{ 1}= are attached. The chain passes round a runner, or pulley, placed in the outer end of the hinged lever =Y=, which is in this way sustained. It is obvious that the vertical position of the lever will be strictly regulated by the position of the two arms =U U^{ 1}=. As they follow the oscillations of the winding and counter faller shafts, the elevated position of these during spinning ensures the lever =Y= being raised at its free end. This results in the tooth, or detent, being taken out of contact with the teeth on the pulley =S=. When the counter faller is depressed by reason of the tension of the yarn upon it a similar movement occurs in the lever =Y=.
(338) In the early stages of winding, when the winding faller is depressed to a comparatively large extent prior to being locked, the vertical position of the lever =Y= is naturally lower than when the winding faller is not pushed down so far. It thus occurs that, when the cop bottom is being formed, which is the stage during which the traverse of the nut is required, and the winding faller is locked at its lowest point, the clearance of the detent catch on =Y= and the teeth on the pulley =S= is least. At this period, therefore, they are most easily engaged by any depression of the counter faller. When the higher initial velocity of the spindle, produced as described in paragraph 336, causes the yarn to be put into tension and the counter faller wire depressed, an engagement of the catch and pulley teeth occurs.
(339) The effect is that the rotation of the toothed pulley is stopped, and the band =Q= is practically gripped by =S= and its fellow pulley =S^{ 1}=, which are borne by the carriage. Instead, therefore, of slipping over the pulleys as before, the band is drawn along with the carriage and the remaining pulleys are caused to revolve. The force so applied is sufficient to rotate the grooved pulley =P^{ 1}= by overcoming the resistance of the spring clip, and the bevel wheels and quadrant screw are rotated. The nut is thus moved outwards, and the winding chain relieved as previously described. This causes a slight diminution in the speed of winding, sufficient to relieve the pressure of the threads on the counter faller wire, which rises and breaks the contact of the detent and the toothed pulley. The further movement of the nut is thus arrested.