Patent GB-941967-A (GB)
Title: Speed control for spinning machines or the like
Inventor: LONG JOHN RUSSELL
IPC: D01H1/30
Filed: 1961-12-23
Abstract: 941,967. Variable-speed control. SHUFORD MILLS Inc. Dec. 23, 1961, No. 46150/61. Heading F2D. [Also in Division D1] In a ring-spinning-frame having regulating means for producing a gradual increase and decrease in the speed of the spindles and ring- rail as they reciprocate, additional automatically-operable means are provided for initiating the change of speed at a predetermined short interval before the ring-rail changes its direction of movement. There is provision for changing the " rate, range and extent of the speed variation independently of the instant at which the speed-change occurs, i.e. the frequency at which the speed changes occur, the distance the ring-rail moves during the speed changes and the amount by which the speed changes. As shown in Fig. 1, the spindles at each side of the machine are driven by tapes from a tin-roller 17 on a shaft 16 which also drives a cam 31 of a conventional budding-motion. Shaft 16 is driven by a motor 60 through an expanding pulley 61, a belt 64 and a pulley 63. To vary the speed of rotation of shaft 16 one flange of the pulley 61 is movable towards and away from the other, while the belt is kept in tension by the motor 60 correspondingly moving in a guide 96, these movements being brought about according to the pressure in cylinders 75, 97 respectively under the control of valves such as 106 which are operated by the rise and fall of the ring-rail. In Fig. 8, the flanges 65, 66 of pulley 61 and a cylinder 75 and piston 76 rotate with motor-shaft 62; pulley 65 and piston 76 being fixed relatively to the shaft and pulley 66 and piston 75 being keyed to slide on it when pressure is admitted or exhausted through a conduit 84 to the right of the piston. In Fig. 9, motor 61 is mounted on a slide 95 connected to the piston of a fixed cylinder 97. The valves controlling the pressure in the cylinders are as shown in Fig. 7, passages e, f communicating respectively with a source of pressure fluid and the cylinder. It consists of upper and lower plungers 117, 118, the former having a piston g, and the latter a diaphragm 119 and providing seatings a, b respectively for interconnected valve-members c, d, the upper member being urged upwardly against a fixed seating by a spring 124 and the lower one being urged upwardly by a stronger spring 121 adjustable at 122. The valve is operated by the rise and fall of a member 135 according to the movements of the ring-rail, the valve being shown in the condition corresponding to minimum pressure conditions in the cylinder to which passage f is connected. As 135 descends, plunger 117 is forced downwardly so that member d is forced on to its seating: as 117 continues to descend, seating a gradually leaves the member c, and a gradually increasing pressure builds up in passage f through parts h and j, until the pressure above the diaphragm 119 exceeds the force exerted by spring 121, when seat b separates from member d and the pressure escapes via ports k, 126. Accordingly the spring 121 is set at 122 so that the pressure accumulating in passage f is no more than is necessary to operate the cylinder concerned. As 135 rises, plunger 117 is returned by spring 124, to bring seating a against member c and gradually lift d off its seating thus slowly venting the pressure in line f and the cylinder until the pressure above diaphragm 119 no longer exceeds that of spring 121, which consequently moves seat b against d, the point at which this occurs and consequently the minimum pressure in line f being determined by the setting of spring 121. Thus the rate at which the pressure increases and decreases in passage f and the cylinder connected to it is controlled by the rate at which 135 descends and ascends. To keep the belt in tension, the motor must move away from the pulley 64 as the flanges of the expanding pulley separate, and vice versa so that pressure is admitted to cylinder 97 as it exhausts from 75. Accordingly, the plungers 117 of the two control valves must be operated together in the opposite senses, and to this end the plungers are engaged alternately by the ends of a centrally pivoted lever 135, Fig. 9, which is in turn engaged by adjustable members 132, 133 of a similarly pivoted lever 130 oscillated from the builder cam 31 through an adjustable follower 147 on a pivoted lever 145 connected to the lever 130 by a chain 140. It takes a short while for the speed changes to be effected so they are initiated slightly before the ring-rail rises and falls by setting the follower 147 in advance of the builder-follower 32. By changing cam 31, the " rate " at which the speed changes occur can be changed; by adjusting the members 132, 133 on the lever 130, the " range " of the speed changes can be changed; and by adjusting the member 122, their " extent " can be changed.