Fig. 169.J.N.
(337) Fixed on the winding faller and counter faller shafts B B1 (Fig. [168]) are two arms U U1, to which the ends of a light chain Y1 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 U1. 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.
Figs. 170 and 171.J.N.
(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 S1, 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 P1 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.
(340) The necessity for a diminution of the initial velocity of the spindle is strictly relative to the counts of yarn being spun. Some of the finer counts require a very slow traverse of the nut, and there may be practically none during several draws of the carriage. As the nut slowly rises and the locking point of the winding faller is elevated, the period of the engagement of the detent catch and the wheel S becomes shorter, and the rotation of the screw is not so prolonged. When the cop bottom is fully formed, the nut is at its most outward point, and the “governing” motion is not therefore required. At this point, the relative positions of the arms U U1 are such, that the chain Y1 will not permit the lever Y to fall sufficiently to allow its tooth to engage with the wheel. The motion, therefore, falls out of use until the commencement of another set of cops.
(341) The motion of the winding scroll is communicated to the tin roller by means of a catch or “click” plate shown in detail in Fig. [168]. On the spindle of the winding scroll X1 is a spur wheel—indicated by dotted lines—which engages with a small pinion on the tin roller shaft T. The whole of this special mechanism is shown in longitudinal section in the right hand top corner of Fig. [168]. The pinion is cast in one piece with the disc V which is loose upon the shaft T. The latter has a pin fixed in it, on which the small catch or “click” V1 is hinged. The click catch is ordinarily held out of position by the bent spring W1, which surrounds the boss of a ratchet wheel T1—to which the name of the “click wheel” is given. When the “click spring” W1 is slightly oscillated in the same direction as the rotation of the ratchet wheel, it allows the click catch to fall into gear with the click wheel. As the latter is keyed upon the tin roller shaft T, the engagement with it of the catch causes the tin roller to be revolved, and thus rotates the spindles.
(342) It was formerly the practice to allow the click catch to fall into gear when the disc V began to rotate upon the commencement of the inward run of the carriage. It was, however, found that the click catch engaged with the wheel earlier at one stretch than at another, and that, consequently, winding began a little more slowly than it should. The effect of such an occurrence is that a little slack yarn was produced as the carriage was running in, although winding was not taking place. Under these conditions tight winding at the nose throughout was practically impossible. It will be easily understood that, when the click catch is released, it may very readily be left either close to the tooth with which it has to engage or only just over the point of the preceding tooth. In the first case the engagement would take place at once, while in the second instance almost the distance of a tooth would have to be travelled by the click catch before engagement occurred. In hard twisted yarns this is especially objectionable, and its prevention is of importance.
(343) To overcome the defect thus explained a hanging lever W is fitted on the tin roller shaft, and the click spring W1, instead of fitting on the boss of the disc V, fits on the inner boss of the lever W, which it clips. A slight oscillation of the lever is, therefore, at once followed by the movement of the spring, and the click catch is engaged. The tail end of the lever W comes in contact with a stop R1 on the holding-out catch rod R. When R is moved in order to release the catch it causes the lever W to move into the position shown by the dotted lines, and so oscillate the spring W1. The tail of the click spring passes between a fork formed in the click catch, and thus presses the catch in either direction, according to which side of the fork it gears with. When, therefore, the click spring is oscillated by the releasing movement of the holding-out rod acting upon the lever W, the click catch is forced hard up to the tooth with which it is engaging. The continued movement of the rod, if made, has, of course, no further effect upon the click catch, but the parts are quite ready for winding with the click in gear. Immediately the carriage begins its inward run winding commences. Thus, whatever may be the position of the click catch at the end of an outward run, it is always ready for its work before the inward run commences. The weight of the rod W is sufficient to keep the click catch disengaged during the whole period of spinning and backing-off.