GB1387289A - Servicing assembly for automatic yarn piecing apparatus - Google Patents

Abstract

1387289 Piecing; end catcher; threading travellers MAREMONT CORP 4 May 1972 [3 June 1971] 20905/72 Heading DID A piecing carriage mounted on a ring spinning machine comprises a servicing assemlbly 56 which can move vertically and generally horizontally towards the spinning machine to be supported by the ring rail for movement therewith. The servicing assembly 56 is mounted for movement from a position above the maximum elevation of the ring rail, and is connected to a servicing assembly support 112 which moves laterally to a position overlying the ring rail in response to the vertical movement of the assembly from its maximum elevation. As shown, the moving piecing carriage carrying piecing devices stops in front of the spindle requiring servicing. A latch (110) is then released and the end-catching/threading servicing assembly 56 descends under gravity and a support 112 (Fig. 8) swings out by spring or gravity over the ring rail to support the assembly thereon and move vertically therewith. The end catching/threading servicing assembly 56 is then pivoted forwardly to the position illustrated in Fig. 8 and aligned on the ring. This forward movement brings a suction nozzle 60 and yarn unwinding device adjacent the bobbin (Fig. 12, not shown). The free end of the yarn is then unwound and drawn into the suction tube 60. An air blast from a nozzle (70) moves the traveller around the ring to a position adjacent tab (192, Fig. 12). The end catching/threading unit is then retracted (Fig. 10, not shown) to bring a thread guide (94) into operation, and then advanced again to thread the yarn by using a second blast of air from nozzle (70) to move the traveller around the ring. After threading of the yarn onto the traveller, the servicing assembly is retracted and raised to its initial position (Fig. 1). A piecing unit 58 then carries the threaded yarn end to the drafting rolls 14, join the yarn ends, and returns.