GB200250A - Improvements in electrical stop motions for knitting-machines - Google Patents

Abstract

200,250. Imray, O. Y., (Hineline Engineering Co.). April 24, 1922. Stop-motions.-Relates to an electrical stopmotion operated by the undue tension or failure of yarn supply. A movable part 5 such as a rock shaft is provided with an upwardly extending arm 6 which bears against one side of a slidable belt-shipper frame 3 so that when an electrical circuit is completed through a magnet 22, Fig. 6, in a box 10, the shaft 5, which passes through the box, is rocked and moves the frame 3 and shifts the driving-belt on to a loose pulley. The shaft 5 is held in machine-running position by the engagement of a notch 26 in a cam 23 thereon with a projection 29 on a ,pivoted armature 28. The occurrence of a broken yarn or increased tension thereof energizes the magnet and releases the notch 26 from engagement with the projection 29. The wiring of the circuit is such that magnet remains energized as long as the defect in the yarn continues, the return of the shaft 5 to machine-starting position being thus prevented. A brake shoe 55a, Fig. 5, may be applied to the fast pulley when the shaft 5 is rocked by a spring 57<a> acting on a bell crank 47<a>. The. yarns pass from bobbins or packages on a creel frame, through slotted knot-catching discs 75, between members 38, 40 carried by a box on the top of a standard 30, and through the forks 45 of sweep arms such as 43 which are pivoted to a block 42<a> on the end of a rod 42 extending vertically from the cover 33 of the box 32. Pivoted to each arm 43 is a rod 47 the lower end of which passes through a spring 50 and through the cap 33. The tension of the yarns is individually adjusted by sliding collars 48 along the rods 47. The box 32 is provided with four mercury cups such as 52 lined with insulating material. The lower end of each rod 47 carries a yoke of silver wire &c., the ends 54, 55 may make contact with two adjacent cups 52. When a yarn becomes unduly tensioned the corresponding arm 43 is drawn down until when position B is reached the yarn starts to slip out of the fork 45, the contacts 54, 55 dipping into the mercury at the same time and completing a circuit. This construction permits of a supply of slack yarn to the needles and tends to prevent the occurence of holes in the fabric. Each yarn also passes between a frame 40 and a number of fingers 39 on arms 38 on the ends of shafts mounted within bushes such as 37 projecting from the surface of the box 32. When a yarn breaks the corresponding shaft rocks and dips contacts 61, 62, Fig. 12, at the inner end into the mercury cups, thus completing the circuit.