Patent GB-714841-A (GB)
Title: Improvements in or relating to looms
IPC: D03D45/20
Filed: 1951-04-13
Abstract: 714,841. Looms combined with bobbin winding machines. UNIVERSAL WINDING CO. April 13, 1951 [May 3, 1950], No. 8648/51. Classes 120(2), 120(3) and 142(2) An automatic loom is provided with means for winding weft bobbins and supplying them to the weft replenishing- mechanism. Feeding bobbins to winding mechanism. Exhausted bobbins, ejected from a shuttle, pass down a shoot C to a stripper S and are delivered to a receptacle R. A conveyer belt 315, having permanent magnets 319 which attract metal rings r on the bobbin head, collects the bobbins from the receptacle R and delivers them to a magazine 20. A finger 320 aligns the bobbins for entry into a shoot 19 of the magazine 20. Cam means in a casing 8 rotates a rod 40, Fig. 5, and arms 23, 24 thereon swing down and transfer the lowermost bobbin to the winding position where it is held by centres 11, 12; the centre 11 is driven through a clutch by a spindle 10 from an electric motor. Yarn supply and tensioning. Yarn from a package P passes to a tension device 43, compressing pairs of discs, through an eye 47, to a traverse guide 25. Rotation of the shaft 40, carrying the arms 23, 24 operates a Bowden cable which raises the uppermost of each pair of discs to relieve yarn .tension when winding commences. Yarn tension is also relieved during doffing by movement of a bearing 15, carrying the centre 12, and which also operates the Bowden cable. A clip 83 that holds and returns the thread from adjacent the centre 12 to the centre 11 for commencement of winding another bobbin causes a bail 150 to pass beneath a new bobbin and deflect the yarn so that it wraps partly round a metal ferrule f on the bobbin and engages one of a number of prongs p thereon when the bobbin rotates. A U- shaped bail 70 rotates, upon yarn breakage, to actuate stopping mechanism. Winding. Automatic winding means may be as described in Specifications 520,038 and 548,654. At the commencement of winding, a bunch of reserve yarn is wound adjacent the bobbin head h, and subsequently the yarn is guided along the bobbin by the traverse guide 25 moved by a reciprocating bar 26. When the guide 25 reaches the bobbin tip, a projection 28 thereon engages a trip element 30 and rocks a rod 31 causing donning and doffing mechanism to operate. At the commencement of doffing, a spring 38 moves the bearing 15 and centre 12 away from the centre 11. A hand lever 71 is provided to move the bearing 15 towards the centre 11 and compress spring 30 previous to the recommencement of winding after yarn breakage. Manipulating yarn ends. Clips 83, 84, reciprocated in opposite directions by toothed racks driven by gearing from a member having the motion of a crank, each have a fixed jaw and a movable jaw, the latter being opened by cams 106 on the clips striking abutments. When a bobbin is doffed, clip 83 clamps the yarn extending to the supply and clip 84 cuts and clamps the yarn extending to the doffed bobbin. The cutting is carried cut by sharpened edges on members 112, 116 of clip 84. A pawl on the clip 83 engages and returns the traverse guide 25 to its initial position near the bobbin head. The weft end from the doffed bobbin is drawn by clip 84 beneath a spring arm 176 that presses the yarn against a resilient pad 182. Fingers 175 on a rotating drum 170 carry the yarn on to the periphery of the drum where a roller holds it under tension. The drum is roughened or may be covered with fabric. The drum is rotated by ratchet mechanism actuated by the movement of the slay. A brake shoe prevents the drum from moving in the opposite direction. The drum may be turned by a hand lever. Loom magazine for doffed bobbins. A doffed bobbin, on entering the magazine 250, is momenarily held on a shelf 251 while its end is secured to the drum 170. The shelf hinges downwardly to deliver the bobbin into the magazine and is released by connections from the drumturning mechanism. A second shelf 265, counterbalanced by an arm 267, is also provided to keep a falling bobbin horizorital. When the magazine is full,'the uppermost bobbin holds the shelf down and the drive to the motor is interrupted by electrical or mechanical means. A micro-switch may be provided for this purpose. The bobbins are held in the magazine by clamps and are released automatically to allow the bobbins to feed downwards as replenishment takes place. Weft replenishing mechanism; shuttle threading. Movement of a transfer hammer rocks a shaft to release a yarn clamp which seizes the yarn from a finger and aligns it with the threading slot of the shuttle. A hunter on the slay resets., the clamp in its initial position. The weft is cut by a temple cutter; the trailing weft end from the ejected bobbin is cut by the usual cutters. Specification 678,991 also is referred to.