Patent GB-699902-A (GB)
Title: Improvements in or relating to means for doffing textile ring frames
Filed: 1949-01-15
Abstract: 699,902. Doffing arrangements for textile ring frames. FARTINGTON,. H. Jan, 5, 1950 [Jan. 15, 1949; Dec. 15, 19491, Nos. 1196/49 and 32175/49. Classes 120(ii) and 120(iii) [Also in Group XXVI] A machine for doffing textile ring frames is traversable along the front of a frame in a series of steps and has means, for removing full bobbins from a group of spindles and for donning empty bobbins on to an adjacent group of spindles. The machine is mounted on wheels located at each end and on intermediate track wheels 7 driven through a chain 35 from a cross-shaft 27 receiving motion through a clutch 29, 33 and gearing from another cross-shaft 13 driven by a belt 16 from a motor 10 supplied with current by a trailing cable 11. A shaft 24 driven through bevel gears 26, 25 and a clutch 52, 53 from the cross-shaft 27 transmits motion to the doffing and donning elements. On the outer end of the shaft 24 is a crank 70 connected by a rod 71 to a radial arm 72 on a shaft 73 carrying arms 74 connected to reciprocate a sliding frame located beneath a bobbin magazine 122 from which empty bobbins are dropped on to the sliding frame by the reciprocation of apertured plates by means of a crank 111 and a. cylindrical cam 106 on a shaft 97. Bobbins falling from the magazine are tilted to a vertical position and are received in the compartments of a hopper 81 provided with an apertured slidable plate 87, which supports the bobbins until they are dropped on to the spindles by a movement of the plate 87 to bring the apertures into line with the hopper compartments. The elements for removing full bobbins are mounted on a rising and falling platform suspended from chains 100, 101 and counter-weighted by a weight 105 suspended from chains 104, all the chains being secured to the shaft 97. Mounted on the platform is a horizontally movable slide 123 which has a vertical concavity 124 for each of the bobbins to be doffed. The lower part of each concavity 124 has a forwardly extending hoop 125 and, as the slide 123 is moved outwards towards the spindles, the hoops 125 displace the yarns and travellers to the rear of the spindles and, as the platform descends, the hoops 125 pass over the bobbins to encircle and maintain them in an upright position during the period when they are lifted by raising the platform,. after pins 127 have been projected under the bases of the bobbins. During the raising of the bobbins from the spindles, "doffing coils" previously wound on the bottoms of the bobbins fall in coils around the spindles. These coils may be maintained on the spindles by passing a resilient member, such as a hinged bush, across the spindles to rub the coils in a winding direction. When the bobbins are clear of the spindles, they are drawn inwardly and a cutting bar 145 having V-shaped notches 145a in its upper edge leading to cutting slots with which movable cutting blades are associated is moved outwardly so that the portions of yarn extending between the bobbins and the spindles pass down the notches. 145a to the cutting slots where they are severed, the bobbins in the meantime being lowered on to a hinged horizontal plate which is pivoted after the severing of the threads to allow the bobbins to fall into a receptacle beneath. As the donning and doffing of one group of spindles approaches completion, a cam 69 on half-clutch 53 strikes a lever operative to close the clutch 29, 33, thus transmitting drive to track wheels 7, and simultaneously raising temporarily a latching member 50 out of a notch 51a in a rail 51 fixed to the ring frame. As the doffing machine begins to move along the ring frame, an arm 67 is displaced by an obstruction 68 on the rail 51 to open the clutch 52, 53 and bring the donning and doffing mechanisms to rest. When the latching member 50 drops into the next notch 51a in the rail 51, the drive to the track wheels 7 is declutched and the donning and doffing mechanisms are clutched in. Hydraulically extensible members between the track wheel axle and the machine frame are provided for adjusting the height of the operative parts and rollers 182 ride on the rear face of the notched rail 51 to keep the machine properly associated with the ring frame. Specification 636,760 is referred to.