Patent GB-1243669-A (GB)
Title: Piecing-up device and method for spinning frames
IPC: D01H15/00
Filed: 1968-09-03
Abstract: 1,243,669. Yarn piecing arrangement. KANEGAFUCHI BOSEKI K.K. 3 Sept., 1968 [1 Sept., 1967; 1 Feb., 1968; 1 April, 1968 (5)], No. 41932/68. Heading DID. A broken yarn is pieced up in a ring spinning machine by threading an auxiliary yarn onto the traveller associated with the station where the yarn is broken, engaging the free end of the auxiliary yarn with the rotating bobbin, holding the yarn intermediate its source at the bobbin to cause it to become taut and twisted, moving the twisted length into engagement with a roving extending from the drafting rollers and severing the auxiliary yarn between the point at which it is held and the point where it contacts the roving so that untwisting of the auxiliary yarn binds it together with the roving. First embodiment When a yarn break occurs between delivery rollers 90 and bobbin 94 a carriage 18 having supporting and guiding rollers 19, 20 engaging rails 16, 17 on the spindle rail 15 is moved by hand to the appropriate spindle. To locate the carriage in position a member 23, 24, 28 pivoted on the carriage is rotated clockwise by a handle 29 so that the member 24 which is forked engages the spindle 25. Spring loaded members hold member 24 in this position and simultaneously a C-shaped lever 32 pivoted at 31 on the carriage is released. The upper end of a repair yarn 68 which is gripped between plates 48, 55, see Fig. 6, and runs from a bobbin 67 mounted on the carriage is then drawn by hand over a roller 49 mounted on the end of lever 32, through a guide 50 and then to the ring 79. Then a slide member mounted on carriage 18 is unlocked by a lever 87 and lowered until a stop 78 thereon engages the ring rail 77. Thus a blowing nozzle 80 mounted on the slide member is located relative to the ring and blows the traveller about the ring and over the yarn end which is held in an appropriate position, see Figs. 11 and 12 not shown. The end of the yarn is released and is wound onto the bobbin 94, Fig. 12 not shown. The lever 32 is then rotated clockwise by a handle 65 and as this is done a member 73 moves to grip yarn 68 against a member 72 and thus prevent further yarn being drawn from bobbin 67, thus high twist is insert in the length of yarn leading to bobbin 94. The lever 32 is then rotated until roller 49 engages bottom roller 90 and yarn 68 is pulled strongly away from the yarn gripper 48 causing the yarn to slide downwards between plates 53, 55 until it engages a blade 59 set on the drafting roller side of gripper 48; thus the yarn is severed. The roving 93 from the delivery rollers which has previously been drawn into a suction duct 91 is passing side by side with thread 68 between rollers, 49 and 90, and owing to the high twist in thread 68 the two twist together to complete the piecing up operation. The lever 32 is then lowered and the carriage 18 is ready to be moved to the next station having a break, the locating member 24 being automatically retracted as the lever 32 is raised to its highest point. It is stated that the movement of carriage 18, the locating of the carriage and the movement of arm 32 can be automatically performed. Second embodiment In a second embodiment Figs. 13-35 not shown a carriage is movable to any spindle station to repair a break between the delivery rollers and the bobbin or to cause the delivered yarn to be wound onto an empty bobbin after donning. A cop of repair yarn is provided on the carriage and yarn therefrom is automatically threaded through the traveller and wrapped onto the bobbin. The length of yarn to the traveller is then held to become highly twisted and then displaced by a roller mounted on a movable plate on the carriage into contact with the lower delivery roller over which roving is passed to a suction duct. The yarn and roving thus twist together at this point, the excess roving being sucked away and the repair yarn is broken by the forwarding action of the delivery roller. The levers and other devices which control the movement of the yarn are operated from a number of cams on a shaft through cable and lever linkages. Alternative form of yarn and roving joining apparatus As before a broken roving F runs to a suction nozzle 303. The lower end of a repair yarn T is threaded through the traveller and onto the bobbin. A roller 309 on an horizontally movable carriage is then moved by an arm 318 to engage yarn T and trap it together with the roving F between delivery roller 302a and roller 309. Roller 309 has a central slit (309a) see Fig. 39 not shown and is associated with upper and lower suction nozzles 310, 311, see also Fig. 39, so that the repair yarn and roving are aligned. After roller 309 contacts roller 302a a blade 322 cuts the repair yarn at a guide 323. Roller 309 is then retracted the piecing up being completed. Device for storing predetermined length of repair yarn Arranged on the carriage is a device on which a fixed length of repair yarn is stored ready to be threaded through a traveller and onto a bobbin. As shown it comprises a rotor 407 with a helical groove on its outer surface and an axially movable member 409 which is urged into engagement with the lower part of rotor 407 by a spring 410. Members 407 and 409 are hollow to provide a suction duct down which the repair yarn can be drawn into a guide 414. After a piecing up operation the yarn end is clamped between rotor 407 and member 409 and no yarn is wound on 407. A gear 411 is then driven through a predetermined number of revolutions so that rotor 407 winds a predetermined length of yarn onto its surface. When the repair yarn is repaired for piecing up member 409 is downwardly displaced on operation of a control wire 413 so that the yarn wound on rotor 407 is drawn off by suction and passed into guide 414 for the piecing up operation. Means for determining the position at which repair yarn is wound on partly wound bobbin In Figs. 44, 48 not shown means are described whereby the repair yarn is wound onto a partly filled bobbin at a point D and not at a point A so that sloughing of the yarn on unwinding is prevented.