Patent GB-190606098-A (GB)
Title: Improvements in or relating to Variable Speed Mechanism.
Inventor: BOULT ALFRED JULIUS
Filed: 1906-03-13
Granted: 1906-11-08
Abstract: 6098. Boult, A. J., [Wardwell, S. W.] March 13. Variable-speed gearing; ratchet gearing, clutches; mounting and securing wheels &c. on shafts.-Relates to variable-speed mechanism which is specially designed for use with machines for winding yarn or thread into packages according to the system known as the " \/ or universal " wind, the object being to regulate the slight peripheral advance or retreat of the package being wound with regard to the reversing point of the traversing guide, so that the coils on the package lie closely adjacent to one another. The driving-shaft 4, Fig. 2, is connected to the driven shaft 2 by a train of spur gearing 5, 6, 7, 8, 9, of which the wheel 9 is loose on the shaft 2 and is connected with it through a fixed member 10, a friction clutch 13, and a pinion 11, which engages with internal teeth on the wheel 9. Means is provided whereby, as the wheel 9 revolves, the pinion' 11 may be prevented from rotating on its axle, in which case the wheel and shaft 2 rotate together, or the pinion may be rotated slightly so as to cause it to roll on the internal teeth of the wheel 9 and cause the shaft 2 to gain or lose slightly with regard to the wheel 9. The shaft 17 of the pinion 11 carries a ratchetwheel 15, the pawl 23 of which is pivoted on an arm 20, Fig. 4, which is oscillated by means of a link 27 connected with a crank-pin 28 carried by a shaft 30 which is not concentric with the shaft 2. The eccentricity of the shaft 30 with regard to the shaft 2 is preferably equal to the length of the crank-arm, so that, by rotation of the shaft 30, the crank-pin 28 may be adjusted to a position which is concentric with the shaft 2, or which has any desired degree of eccentricity therefrom less than the length of the crank-arm. If the shaft 2 and crank-pin 28 are concentric with one another, the wheel 9, pinion 11, and shaft 2 rotate together as one piece, but, if the crank-pin is moved into an eccentric position, the arm 20 of the ratchet-wheel is oscillated as the latter is carried round with the wheel 9 and the pinion moves on the internal teeth' of the wheel 9, so causing the shaft 2 to gain or lose as required. The wheel 8 of the train of gearing shown in Fig. 2 consists of an internallytapered toothed rim which is mounted on the correspondingly-tapered boss 49 of a sleeve 48, through which passes a shaft 50 carrying at one end a disk 51 and at the other a screwed head 52. The toothed rim and its carrying-boss thus form two parts of a friction clutch which may be engaged or released by rotation of the head 52. The shaft 30 is provided with a graduated dial plate 32, which is graduated to indicate the degree of adjustment required for producing different speed ratios of the wheel 9 with regard to the shaft 2. It is provided with peripheral teeth which drive a second dial plate 33 carried by a spring arm 34, Fig. 10, provided with a spring latch 44 for engaging in notches in the dial plate. The movement of the dial plate 32 is determined by a pointer which may be adjusted according to the desired position of the zero point. Figs. 13 and 14 show a modified arrangement of ratchet and clutch mechanism for operating the pinion 11 from the eccentric crank-pin 61. The pinion shaft 17 carries the halves 53, 51 of two clutches having oppositely-arranged ratchet teeth, the two halves when placed on the shaft 17 resembling a spool as shown. Upon the barrel of the spool is mounted loosely the sliding and rotating part 57, also resembling a spool in shape, which can engage with either of the half -clutches 53, 54 and has teeth upon its barrel which are engaged by a toothed rack 59 mounted on the crank-pin 61, which also carries a pair of fork arms 62 which engage with the bevelled sides of the movable part 57. The effect of this arrangement is that the part 57 is moved to one side or the other by the arms 62 according to the direction in which the wheel 9 is rotated, and, by the oscillation of the rack 59, the pinion is caused to rotate on its axle in the manner desired. The eccentricity of the crank-pin 61 is in this case regulated by the movement of an arm 65 over a graduated dial.